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1f2235b8e7
Commit ff823c79a5 ("usb: move children
to struct usb_port") forgot to consider the hub_disconnect sequence,
which releases ports before quiescing the hub, which will lead to a
use-after-free, since hub_quiesce() will try to disconnect ports'
children, which are already deallocated. Simple modprobe dummy_hcd &&
rmmod dummy_hcd will illustrate the problem.
This patch moves deallocation of hub's ports after hub_quiesce() call
in hub_disconnect().
Cc: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5261 lines
148 KiB
C
5261 lines
148 KiB
C
/*
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* USB hub driver.
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*
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* (C) Copyright 1999 Linus Torvalds
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* (C) Copyright 1999 Johannes Erdfelt
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* (C) Copyright 1999 Gregory P. Smith
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* (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
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*
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/completion.h>
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#include <linux/sched.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/ioctl.h>
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#include <linux/usb.h>
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#include <linux/usbdevice_fs.h>
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#include <linux/usb/hcd.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/quirks.h>
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#include <linux/kthread.h>
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#include <linux/mutex.h>
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#include <linux/freezer.h>
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#include <linux/random.h>
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#include <asm/uaccess.h>
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#include <asm/byteorder.h>
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#include "usb.h"
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/* if we are in debug mode, always announce new devices */
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#ifdef DEBUG
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#ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
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#define CONFIG_USB_ANNOUNCE_NEW_DEVICES
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#endif
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#endif
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enum port_power_policy {
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USB_PORT_POWER_ON = 0,
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USB_PORT_POWER_OFF,
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};
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struct usb_port {
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struct usb_device *child;
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struct device dev;
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struct dev_state *port_owner;
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enum usb_port_connect_type connect_type;
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enum port_power_policy port_power_policy;
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};
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struct usb_hub {
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struct device *intfdev; /* the "interface" device */
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struct usb_device *hdev;
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struct kref kref;
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struct urb *urb; /* for interrupt polling pipe */
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/* buffer for urb ... with extra space in case of babble */
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char (*buffer)[8];
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union {
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struct usb_hub_status hub;
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struct usb_port_status port;
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} *status; /* buffer for status reports */
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struct mutex status_mutex; /* for the status buffer */
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int error; /* last reported error */
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int nerrors; /* track consecutive errors */
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struct list_head event_list; /* hubs w/data or errs ready */
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unsigned long event_bits[1]; /* status change bitmask */
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unsigned long change_bits[1]; /* ports with logical connect
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status change */
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unsigned long busy_bits[1]; /* ports being reset or
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resumed */
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unsigned long removed_bits[1]; /* ports with a "removed"
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device present */
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unsigned long wakeup_bits[1]; /* ports that have signaled
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remote wakeup */
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#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
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#error event_bits[] is too short!
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#endif
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struct usb_hub_descriptor *descriptor; /* class descriptor */
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struct usb_tt tt; /* Transaction Translator */
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unsigned mA_per_port; /* current for each child */
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unsigned limited_power:1;
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unsigned quiescing:1;
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unsigned disconnected:1;
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unsigned has_indicators:1;
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u8 indicator[USB_MAXCHILDREN];
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struct delayed_work leds;
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struct delayed_work init_work;
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struct usb_port **ports;
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};
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static const char on_string[] = "on";
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static const char off_string[] = "off";
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static const struct attribute_group *port_dev_group[];
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static inline int hub_is_superspeed(struct usb_device *hdev)
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{
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return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS);
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}
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/* Protect struct usb_device->state and ->children members
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* Note: Both are also protected by ->dev.sem, except that ->state can
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* change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
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static DEFINE_SPINLOCK(device_state_lock);
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/* khubd's worklist and its lock */
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static DEFINE_SPINLOCK(hub_event_lock);
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static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
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/* Wakes up khubd */
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static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
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static struct task_struct *khubd_task;
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/* cycle leds on hubs that aren't blinking for attention */
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static bool blinkenlights = 0;
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module_param (blinkenlights, bool, S_IRUGO);
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MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
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/*
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* Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
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* 10 seconds to send reply for the initial 64-byte descriptor request.
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*/
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/* define initial 64-byte descriptor request timeout in milliseconds */
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static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT;
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module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(initial_descriptor_timeout,
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"initial 64-byte descriptor request timeout in milliseconds "
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"(default 5000 - 5.0 seconds)");
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/*
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* As of 2.6.10 we introduce a new USB device initialization scheme which
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* closely resembles the way Windows works. Hopefully it will be compatible
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* with a wider range of devices than the old scheme. However some previously
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* working devices may start giving rise to "device not accepting address"
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* errors; if that happens the user can try the old scheme by adjusting the
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* following module parameters.
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*
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* For maximum flexibility there are two boolean parameters to control the
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* hub driver's behavior. On the first initialization attempt, if the
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* "old_scheme_first" parameter is set then the old scheme will be used,
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* otherwise the new scheme is used. If that fails and "use_both_schemes"
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* is set, then the driver will make another attempt, using the other scheme.
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*/
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static bool old_scheme_first = 0;
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module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(old_scheme_first,
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"start with the old device initialization scheme");
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static bool use_both_schemes = 1;
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module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(use_both_schemes,
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"try the other device initialization scheme if the "
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"first one fails");
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/* Mutual exclusion for EHCI CF initialization. This interferes with
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* port reset on some companion controllers.
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*/
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DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
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EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
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#define HUB_DEBOUNCE_TIMEOUT 1500
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#define HUB_DEBOUNCE_STEP 25
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#define HUB_DEBOUNCE_STABLE 100
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#define to_usb_port(_dev) \
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container_of(_dev, struct usb_port, dev)
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static int usb_reset_and_verify_device(struct usb_device *udev);
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static inline char *portspeed(struct usb_hub *hub, int portstatus)
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{
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if (hub_is_superspeed(hub->hdev))
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return "5.0 Gb/s";
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if (portstatus & USB_PORT_STAT_HIGH_SPEED)
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return "480 Mb/s";
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else if (portstatus & USB_PORT_STAT_LOW_SPEED)
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return "1.5 Mb/s";
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else
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return "12 Mb/s";
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}
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/* Note that hdev or one of its children must be locked! */
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static struct usb_hub *hdev_to_hub(struct usb_device *hdev)
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{
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if (!hdev || !hdev->actconfig || !hdev->maxchild)
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return NULL;
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return usb_get_intfdata(hdev->actconfig->interface[0]);
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}
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static int usb_device_supports_lpm(struct usb_device *udev)
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{
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/* USB 2.1 (and greater) devices indicate LPM support through
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* their USB 2.0 Extended Capabilities BOS descriptor.
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*/
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if (udev->speed == USB_SPEED_HIGH) {
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if (udev->bos->ext_cap &&
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(USB_LPM_SUPPORT &
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le32_to_cpu(udev->bos->ext_cap->bmAttributes)))
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return 1;
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return 0;
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}
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/* All USB 3.0 must support LPM, but we need their max exit latency
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* information from the SuperSpeed Extended Capabilities BOS descriptor.
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*/
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if (!udev->bos->ss_cap) {
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dev_warn(&udev->dev, "No LPM exit latency info found. "
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"Power management will be impacted.\n");
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return 0;
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}
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if (udev->parent->lpm_capable)
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return 1;
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dev_warn(&udev->dev, "Parent hub missing LPM exit latency info. "
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"Power management will be impacted.\n");
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return 0;
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}
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/*
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* Set the Maximum Exit Latency (MEL) for the host to initiate a transition from
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* either U1 or U2.
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*/
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static void usb_set_lpm_mel(struct usb_device *udev,
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struct usb3_lpm_parameters *udev_lpm_params,
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unsigned int udev_exit_latency,
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struct usb_hub *hub,
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struct usb3_lpm_parameters *hub_lpm_params,
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unsigned int hub_exit_latency)
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{
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unsigned int total_mel;
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unsigned int device_mel;
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unsigned int hub_mel;
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/*
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* Calculate the time it takes to transition all links from the roothub
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* to the parent hub into U0. The parent hub must then decode the
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* packet (hub header decode latency) to figure out which port it was
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* bound for.
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*
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* The Hub Header decode latency is expressed in 0.1us intervals (0x1
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* means 0.1us). Multiply that by 100 to get nanoseconds.
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*/
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total_mel = hub_lpm_params->mel +
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(hub->descriptor->u.ss.bHubHdrDecLat * 100);
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/*
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* How long will it take to transition the downstream hub's port into
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* U0? The greater of either the hub exit latency or the device exit
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* latency.
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*
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* The BOS U1/U2 exit latencies are expressed in 1us intervals.
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* Multiply that by 1000 to get nanoseconds.
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*/
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device_mel = udev_exit_latency * 1000;
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hub_mel = hub_exit_latency * 1000;
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if (device_mel > hub_mel)
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total_mel += device_mel;
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else
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total_mel += hub_mel;
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udev_lpm_params->mel = total_mel;
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}
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/*
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* Set the maximum Device to Host Exit Latency (PEL) for the device to initiate
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* a transition from either U1 or U2.
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*/
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static void usb_set_lpm_pel(struct usb_device *udev,
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struct usb3_lpm_parameters *udev_lpm_params,
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unsigned int udev_exit_latency,
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struct usb_hub *hub,
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struct usb3_lpm_parameters *hub_lpm_params,
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unsigned int hub_exit_latency,
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unsigned int port_to_port_exit_latency)
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{
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unsigned int first_link_pel;
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unsigned int hub_pel;
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/*
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* First, the device sends an LFPS to transition the link between the
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* device and the parent hub into U0. The exit latency is the bigger of
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* the device exit latency or the hub exit latency.
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*/
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if (udev_exit_latency > hub_exit_latency)
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first_link_pel = udev_exit_latency * 1000;
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else
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first_link_pel = hub_exit_latency * 1000;
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/*
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* When the hub starts to receive the LFPS, there is a slight delay for
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* it to figure out that one of the ports is sending an LFPS. Then it
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* will forward the LFPS to its upstream link. The exit latency is the
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* delay, plus the PEL that we calculated for this hub.
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*/
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hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel;
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/*
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* According to figure C-7 in the USB 3.0 spec, the PEL for this device
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* is the greater of the two exit latencies.
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*/
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if (first_link_pel > hub_pel)
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udev_lpm_params->pel = first_link_pel;
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else
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udev_lpm_params->pel = hub_pel;
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}
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/*
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* Set the System Exit Latency (SEL) to indicate the total worst-case time from
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* when a device initiates a transition to U0, until when it will receive the
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* first packet from the host controller.
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*
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* Section C.1.5.1 describes the four components to this:
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* - t1: device PEL
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* - t2: time for the ERDY to make it from the device to the host.
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* - t3: a host-specific delay to process the ERDY.
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* - t4: time for the packet to make it from the host to the device.
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*
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* t3 is specific to both the xHCI host and the platform the host is integrated
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* into. The Intel HW folks have said it's negligible, FIXME if a different
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* vendor says otherwise.
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*/
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static void usb_set_lpm_sel(struct usb_device *udev,
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struct usb3_lpm_parameters *udev_lpm_params)
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{
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struct usb_device *parent;
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unsigned int num_hubs;
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unsigned int total_sel;
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/* t1 = device PEL */
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total_sel = udev_lpm_params->pel;
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/* How many external hubs are in between the device & the root port. */
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for (parent = udev->parent, num_hubs = 0; parent->parent;
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parent = parent->parent)
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num_hubs++;
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/* t2 = 2.1us + 250ns * (num_hubs - 1) */
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if (num_hubs > 0)
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total_sel += 2100 + 250 * (num_hubs - 1);
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/* t4 = 250ns * num_hubs */
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total_sel += 250 * num_hubs;
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udev_lpm_params->sel = total_sel;
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}
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static void usb_set_lpm_parameters(struct usb_device *udev)
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{
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struct usb_hub *hub;
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unsigned int port_to_port_delay;
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unsigned int udev_u1_del;
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unsigned int udev_u2_del;
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unsigned int hub_u1_del;
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unsigned int hub_u2_del;
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if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER)
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return;
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hub = hdev_to_hub(udev->parent);
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/* It doesn't take time to transition the roothub into U0, since it
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* doesn't have an upstream link.
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*/
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if (!hub)
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return;
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udev_u1_del = udev->bos->ss_cap->bU1devExitLat;
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udev_u2_del = udev->bos->ss_cap->bU2DevExitLat;
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hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat;
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hub_u2_del = udev->parent->bos->ss_cap->bU2DevExitLat;
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usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del,
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hub, &udev->parent->u1_params, hub_u1_del);
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usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del,
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hub, &udev->parent->u2_params, hub_u2_del);
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/*
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* Appendix C, section C.2.2.2, says that there is a slight delay from
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* when the parent hub notices the downstream port is trying to
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* transition to U0 to when the hub initiates a U0 transition on its
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* upstream port. The section says the delays are tPort2PortU1EL and
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* tPort2PortU2EL, but it doesn't define what they are.
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*
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* The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking
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* about the same delays. Use the maximum delay calculations from those
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* sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For
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* U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I
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* assume the device exit latencies they are talking about are the hub
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* exit latencies.
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*
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* What do we do if the U2 exit latency is less than the U1 exit
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* latency? It's possible, although not likely...
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*/
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port_to_port_delay = 1;
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usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del,
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hub, &udev->parent->u1_params, hub_u1_del,
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port_to_port_delay);
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if (hub_u2_del > hub_u1_del)
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port_to_port_delay = 1 + hub_u2_del - hub_u1_del;
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else
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port_to_port_delay = 1 + hub_u1_del;
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usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del,
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hub, &udev->parent->u2_params, hub_u2_del,
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port_to_port_delay);
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/* Now that we've got PEL, calculate SEL. */
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usb_set_lpm_sel(udev, &udev->u1_params);
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usb_set_lpm_sel(udev, &udev->u2_params);
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}
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/* USB 2.0 spec Section 11.24.4.5 */
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static int get_hub_descriptor(struct usb_device *hdev, void *data)
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{
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int i, ret, size;
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unsigned dtype;
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if (hub_is_superspeed(hdev)) {
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dtype = USB_DT_SS_HUB;
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size = USB_DT_SS_HUB_SIZE;
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} else {
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dtype = USB_DT_HUB;
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size = sizeof(struct usb_hub_descriptor);
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}
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for (i = 0; i < 3; i++) {
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ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
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USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
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dtype << 8, 0, data, size,
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USB_CTRL_GET_TIMEOUT);
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if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
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return ret;
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}
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return -EINVAL;
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}
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|
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/*
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* USB 2.0 spec Section 11.24.2.1
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*/
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static int clear_hub_feature(struct usb_device *hdev, int feature)
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{
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return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
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USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
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}
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/*
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* USB 2.0 spec Section 11.24.2.2
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*/
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static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
|
|
{
|
|
return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
|
|
USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
|
|
NULL, 0, 1000);
|
|
}
|
|
|
|
/*
|
|
* USB 2.0 spec Section 11.24.2.13
|
|
*/
|
|
static int set_port_feature(struct usb_device *hdev, int port1, int feature)
|
|
{
|
|
return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
|
|
USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
|
|
NULL, 0, 1000);
|
|
}
|
|
|
|
/*
|
|
* USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
|
|
* for info about using port indicators
|
|
*/
|
|
static void set_port_led(
|
|
struct usb_hub *hub,
|
|
int port1,
|
|
int selector
|
|
)
|
|
{
|
|
int status = set_port_feature(hub->hdev, (selector << 8) | port1,
|
|
USB_PORT_FEAT_INDICATOR);
|
|
if (status < 0)
|
|
dev_dbg (hub->intfdev,
|
|
"port %d indicator %s status %d\n",
|
|
port1,
|
|
({ char *s; switch (selector) {
|
|
case HUB_LED_AMBER: s = "amber"; break;
|
|
case HUB_LED_GREEN: s = "green"; break;
|
|
case HUB_LED_OFF: s = "off"; break;
|
|
case HUB_LED_AUTO: s = "auto"; break;
|
|
default: s = "??"; break;
|
|
}; s; }),
|
|
status);
|
|
}
|
|
|
|
#define LED_CYCLE_PERIOD ((2*HZ)/3)
|
|
|
|
static void led_work (struct work_struct *work)
|
|
{
|
|
struct usb_hub *hub =
|
|
container_of(work, struct usb_hub, leds.work);
|
|
struct usb_device *hdev = hub->hdev;
|
|
unsigned i;
|
|
unsigned changed = 0;
|
|
int cursor = -1;
|
|
|
|
if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
|
|
return;
|
|
|
|
for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
|
|
unsigned selector, mode;
|
|
|
|
/* 30%-50% duty cycle */
|
|
|
|
switch (hub->indicator[i]) {
|
|
/* cycle marker */
|
|
case INDICATOR_CYCLE:
|
|
cursor = i;
|
|
selector = HUB_LED_AUTO;
|
|
mode = INDICATOR_AUTO;
|
|
break;
|
|
/* blinking green = sw attention */
|
|
case INDICATOR_GREEN_BLINK:
|
|
selector = HUB_LED_GREEN;
|
|
mode = INDICATOR_GREEN_BLINK_OFF;
|
|
break;
|
|
case INDICATOR_GREEN_BLINK_OFF:
|
|
selector = HUB_LED_OFF;
|
|
mode = INDICATOR_GREEN_BLINK;
|
|
break;
|
|
/* blinking amber = hw attention */
|
|
case INDICATOR_AMBER_BLINK:
|
|
selector = HUB_LED_AMBER;
|
|
mode = INDICATOR_AMBER_BLINK_OFF;
|
|
break;
|
|
case INDICATOR_AMBER_BLINK_OFF:
|
|
selector = HUB_LED_OFF;
|
|
mode = INDICATOR_AMBER_BLINK;
|
|
break;
|
|
/* blink green/amber = reserved */
|
|
case INDICATOR_ALT_BLINK:
|
|
selector = HUB_LED_GREEN;
|
|
mode = INDICATOR_ALT_BLINK_OFF;
|
|
break;
|
|
case INDICATOR_ALT_BLINK_OFF:
|
|
selector = HUB_LED_AMBER;
|
|
mode = INDICATOR_ALT_BLINK;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
if (selector != HUB_LED_AUTO)
|
|
changed = 1;
|
|
set_port_led(hub, i + 1, selector);
|
|
hub->indicator[i] = mode;
|
|
}
|
|
if (!changed && blinkenlights) {
|
|
cursor++;
|
|
cursor %= hub->descriptor->bNbrPorts;
|
|
set_port_led(hub, cursor + 1, HUB_LED_GREEN);
|
|
hub->indicator[cursor] = INDICATOR_CYCLE;
|
|
changed++;
|
|
}
|
|
if (changed)
|
|
schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
|
|
}
|
|
|
|
/* use a short timeout for hub/port status fetches */
|
|
#define USB_STS_TIMEOUT 1000
|
|
#define USB_STS_RETRIES 5
|
|
|
|
/*
|
|
* USB 2.0 spec Section 11.24.2.6
|
|
*/
|
|
static int get_hub_status(struct usb_device *hdev,
|
|
struct usb_hub_status *data)
|
|
{
|
|
int i, status = -ETIMEDOUT;
|
|
|
|
for (i = 0; i < USB_STS_RETRIES &&
|
|
(status == -ETIMEDOUT || status == -EPIPE); i++) {
|
|
status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
|
|
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
|
|
data, sizeof(*data), USB_STS_TIMEOUT);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* USB 2.0 spec Section 11.24.2.7
|
|
*/
|
|
static int get_port_status(struct usb_device *hdev, int port1,
|
|
struct usb_port_status *data)
|
|
{
|
|
int i, status = -ETIMEDOUT;
|
|
|
|
for (i = 0; i < USB_STS_RETRIES &&
|
|
(status == -ETIMEDOUT || status == -EPIPE); i++) {
|
|
status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
|
|
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
|
|
data, sizeof(*data), USB_STS_TIMEOUT);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static int hub_port_status(struct usb_hub *hub, int port1,
|
|
u16 *status, u16 *change)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&hub->status_mutex);
|
|
ret = get_port_status(hub->hdev, port1, &hub->status->port);
|
|
if (ret < 4) {
|
|
dev_err(hub->intfdev,
|
|
"%s failed (err = %d)\n", __func__, ret);
|
|
if (ret >= 0)
|
|
ret = -EIO;
|
|
} else {
|
|
*status = le16_to_cpu(hub->status->port.wPortStatus);
|
|
*change = le16_to_cpu(hub->status->port.wPortChange);
|
|
|
|
ret = 0;
|
|
}
|
|
mutex_unlock(&hub->status_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void kick_khubd(struct usb_hub *hub)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&hub_event_lock, flags);
|
|
if (!hub->disconnected && list_empty(&hub->event_list)) {
|
|
list_add_tail(&hub->event_list, &hub_event_list);
|
|
|
|
/* Suppress autosuspend until khubd runs */
|
|
usb_autopm_get_interface_no_resume(
|
|
to_usb_interface(hub->intfdev));
|
|
wake_up(&khubd_wait);
|
|
}
|
|
spin_unlock_irqrestore(&hub_event_lock, flags);
|
|
}
|
|
|
|
void usb_kick_khubd(struct usb_device *hdev)
|
|
{
|
|
struct usb_hub *hub = hdev_to_hub(hdev);
|
|
|
|
if (hub)
|
|
kick_khubd(hub);
|
|
}
|
|
|
|
/*
|
|
* Let the USB core know that a USB 3.0 device has sent a Function Wake Device
|
|
* Notification, which indicates it had initiated remote wakeup.
|
|
*
|
|
* USB 3.0 hubs do not report the port link state change from U3 to U0 when the
|
|
* device initiates resume, so the USB core will not receive notice of the
|
|
* resume through the normal hub interrupt URB.
|
|
*/
|
|
void usb_wakeup_notification(struct usb_device *hdev,
|
|
unsigned int portnum)
|
|
{
|
|
struct usb_hub *hub;
|
|
|
|
if (!hdev)
|
|
return;
|
|
|
|
hub = hdev_to_hub(hdev);
|
|
if (hub) {
|
|
set_bit(portnum, hub->wakeup_bits);
|
|
kick_khubd(hub);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_wakeup_notification);
|
|
|
|
/* completion function, fires on port status changes and various faults */
|
|
static void hub_irq(struct urb *urb)
|
|
{
|
|
struct usb_hub *hub = urb->context;
|
|
int status = urb->status;
|
|
unsigned i;
|
|
unsigned long bits;
|
|
|
|
switch (status) {
|
|
case -ENOENT: /* synchronous unlink */
|
|
case -ECONNRESET: /* async unlink */
|
|
case -ESHUTDOWN: /* hardware going away */
|
|
return;
|
|
|
|
default: /* presumably an error */
|
|
/* Cause a hub reset after 10 consecutive errors */
|
|
dev_dbg (hub->intfdev, "transfer --> %d\n", status);
|
|
if ((++hub->nerrors < 10) || hub->error)
|
|
goto resubmit;
|
|
hub->error = status;
|
|
/* FALL THROUGH */
|
|
|
|
/* let khubd handle things */
|
|
case 0: /* we got data: port status changed */
|
|
bits = 0;
|
|
for (i = 0; i < urb->actual_length; ++i)
|
|
bits |= ((unsigned long) ((*hub->buffer)[i]))
|
|
<< (i*8);
|
|
hub->event_bits[0] = bits;
|
|
break;
|
|
}
|
|
|
|
hub->nerrors = 0;
|
|
|
|
/* Something happened, let khubd figure it out */
|
|
kick_khubd(hub);
|
|
|
|
resubmit:
|
|
if (hub->quiescing)
|
|
return;
|
|
|
|
if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
|
|
&& status != -ENODEV && status != -EPERM)
|
|
dev_err (hub->intfdev, "resubmit --> %d\n", status);
|
|
}
|
|
|
|
/* USB 2.0 spec Section 11.24.2.3 */
|
|
static inline int
|
|
hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
|
|
{
|
|
return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
|
|
HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
|
|
tt, NULL, 0, 1000);
|
|
}
|
|
|
|
/*
|
|
* enumeration blocks khubd for a long time. we use keventd instead, since
|
|
* long blocking there is the exception, not the rule. accordingly, HCDs
|
|
* talking to TTs must queue control transfers (not just bulk and iso), so
|
|
* both can talk to the same hub concurrently.
|
|
*/
|
|
static void hub_tt_work(struct work_struct *work)
|
|
{
|
|
struct usb_hub *hub =
|
|
container_of(work, struct usb_hub, tt.clear_work);
|
|
unsigned long flags;
|
|
int limit = 100;
|
|
|
|
spin_lock_irqsave (&hub->tt.lock, flags);
|
|
while (--limit && !list_empty (&hub->tt.clear_list)) {
|
|
struct list_head *next;
|
|
struct usb_tt_clear *clear;
|
|
struct usb_device *hdev = hub->hdev;
|
|
const struct hc_driver *drv;
|
|
int status;
|
|
|
|
next = hub->tt.clear_list.next;
|
|
clear = list_entry (next, struct usb_tt_clear, clear_list);
|
|
list_del (&clear->clear_list);
|
|
|
|
/* drop lock so HCD can concurrently report other TT errors */
|
|
spin_unlock_irqrestore (&hub->tt.lock, flags);
|
|
status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
|
|
if (status)
|
|
dev_err (&hdev->dev,
|
|
"clear tt %d (%04x) error %d\n",
|
|
clear->tt, clear->devinfo, status);
|
|
|
|
/* Tell the HCD, even if the operation failed */
|
|
drv = clear->hcd->driver;
|
|
if (drv->clear_tt_buffer_complete)
|
|
(drv->clear_tt_buffer_complete)(clear->hcd, clear->ep);
|
|
|
|
kfree(clear);
|
|
spin_lock_irqsave(&hub->tt.lock, flags);
|
|
}
|
|
spin_unlock_irqrestore (&hub->tt.lock, flags);
|
|
}
|
|
|
|
/**
|
|
* usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
|
|
* @urb: an URB associated with the failed or incomplete split transaction
|
|
*
|
|
* High speed HCDs use this to tell the hub driver that some split control or
|
|
* bulk transaction failed in a way that requires clearing internal state of
|
|
* a transaction translator. This is normally detected (and reported) from
|
|
* interrupt context.
|
|
*
|
|
* It may not be possible for that hub to handle additional full (or low)
|
|
* speed transactions until that state is fully cleared out.
|
|
*/
|
|
int usb_hub_clear_tt_buffer(struct urb *urb)
|
|
{
|
|
struct usb_device *udev = urb->dev;
|
|
int pipe = urb->pipe;
|
|
struct usb_tt *tt = udev->tt;
|
|
unsigned long flags;
|
|
struct usb_tt_clear *clear;
|
|
|
|
/* we've got to cope with an arbitrary number of pending TT clears,
|
|
* since each TT has "at least two" buffers that can need it (and
|
|
* there can be many TTs per hub). even if they're uncommon.
|
|
*/
|
|
if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
|
|
dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
|
|
/* FIXME recover somehow ... RESET_TT? */
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* info that CLEAR_TT_BUFFER needs */
|
|
clear->tt = tt->multi ? udev->ttport : 1;
|
|
clear->devinfo = usb_pipeendpoint (pipe);
|
|
clear->devinfo |= udev->devnum << 4;
|
|
clear->devinfo |= usb_pipecontrol (pipe)
|
|
? (USB_ENDPOINT_XFER_CONTROL << 11)
|
|
: (USB_ENDPOINT_XFER_BULK << 11);
|
|
if (usb_pipein (pipe))
|
|
clear->devinfo |= 1 << 15;
|
|
|
|
/* info for completion callback */
|
|
clear->hcd = bus_to_hcd(udev->bus);
|
|
clear->ep = urb->ep;
|
|
|
|
/* tell keventd to clear state for this TT */
|
|
spin_lock_irqsave (&tt->lock, flags);
|
|
list_add_tail (&clear->clear_list, &tt->clear_list);
|
|
schedule_work(&tt->clear_work);
|
|
spin_unlock_irqrestore (&tt->lock, flags);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer);
|
|
|
|
/* If do_delay is false, return the number of milliseconds the caller
|
|
* needs to delay.
|
|
*/
|
|
static unsigned hub_power_on(struct usb_hub *hub, bool do_delay)
|
|
{
|
|
int port1;
|
|
unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
|
|
unsigned delay;
|
|
u16 wHubCharacteristics =
|
|
le16_to_cpu(hub->descriptor->wHubCharacteristics);
|
|
|
|
/* Enable power on each port. Some hubs have reserved values
|
|
* of LPSM (> 2) in their descriptors, even though they are
|
|
* USB 2.0 hubs. Some hubs do not implement port-power switching
|
|
* but only emulate it. In all cases, the ports won't work
|
|
* unless we send these messages to the hub.
|
|
*/
|
|
if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
|
|
dev_dbg(hub->intfdev, "enabling power on all ports\n");
|
|
else
|
|
dev_dbg(hub->intfdev, "trying to enable port power on "
|
|
"non-switchable hub\n");
|
|
for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
|
|
if (hub->ports[port1 - 1]->port_power_policy
|
|
== USB_PORT_POWER_ON)
|
|
set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
|
|
else
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_POWER);
|
|
|
|
/* Wait at least 100 msec for power to become stable */
|
|
delay = max(pgood_delay, (unsigned) 100);
|
|
if (do_delay)
|
|
msleep(delay);
|
|
return delay;
|
|
}
|
|
|
|
static int hub_hub_status(struct usb_hub *hub,
|
|
u16 *status, u16 *change)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&hub->status_mutex);
|
|
ret = get_hub_status(hub->hdev, &hub->status->hub);
|
|
if (ret < 0)
|
|
dev_err (hub->intfdev,
|
|
"%s failed (err = %d)\n", __func__, ret);
|
|
else {
|
|
*status = le16_to_cpu(hub->status->hub.wHubStatus);
|
|
*change = le16_to_cpu(hub->status->hub.wHubChange);
|
|
ret = 0;
|
|
}
|
|
mutex_unlock(&hub->status_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
|
|
{
|
|
struct usb_device *hdev = hub->hdev;
|
|
int ret = 0;
|
|
|
|
if (hub->ports[port1 - 1]->child && set_state)
|
|
usb_set_device_state(hub->ports[port1 - 1]->child,
|
|
USB_STATE_NOTATTACHED);
|
|
if (!hub->error && !hub_is_superspeed(hub->hdev))
|
|
ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
|
|
if (ret)
|
|
dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
|
|
port1, ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Disable a port and mark a logical connect-change event, so that some
|
|
* time later khubd will disconnect() any existing usb_device on the port
|
|
* and will re-enumerate if there actually is a device attached.
|
|
*/
|
|
static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
|
|
{
|
|
dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
|
|
hub_port_disable(hub, port1, 1);
|
|
|
|
/* FIXME let caller ask to power down the port:
|
|
* - some devices won't enumerate without a VBUS power cycle
|
|
* - SRP saves power that way
|
|
* - ... new call, TBD ...
|
|
* That's easy if this hub can switch power per-port, and
|
|
* khubd reactivates the port later (timer, SRP, etc).
|
|
* Powerdown must be optional, because of reset/DFU.
|
|
*/
|
|
|
|
set_bit(port1, hub->change_bits);
|
|
kick_khubd(hub);
|
|
}
|
|
|
|
/**
|
|
* usb_remove_device - disable a device's port on its parent hub
|
|
* @udev: device to be disabled and removed
|
|
* Context: @udev locked, must be able to sleep.
|
|
*
|
|
* After @udev's port has been disabled, khubd is notified and it will
|
|
* see that the device has been disconnected. When the device is
|
|
* physically unplugged and something is plugged in, the events will
|
|
* be received and processed normally.
|
|
*/
|
|
int usb_remove_device(struct usb_device *udev)
|
|
{
|
|
struct usb_hub *hub;
|
|
struct usb_interface *intf;
|
|
|
|
if (!udev->parent) /* Can't remove a root hub */
|
|
return -EINVAL;
|
|
hub = hdev_to_hub(udev->parent);
|
|
intf = to_usb_interface(hub->intfdev);
|
|
|
|
usb_autopm_get_interface(intf);
|
|
set_bit(udev->portnum, hub->removed_bits);
|
|
hub_port_logical_disconnect(hub, udev->portnum);
|
|
usb_autopm_put_interface(intf);
|
|
return 0;
|
|
}
|
|
|
|
enum hub_activation_type {
|
|
HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */
|
|
HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME,
|
|
};
|
|
|
|
static void hub_init_func2(struct work_struct *ws);
|
|
static void hub_init_func3(struct work_struct *ws);
|
|
|
|
static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
|
|
{
|
|
struct usb_device *hdev = hub->hdev;
|
|
struct usb_hcd *hcd;
|
|
int ret;
|
|
int port1;
|
|
int status;
|
|
bool need_debounce_delay = false;
|
|
unsigned delay;
|
|
|
|
/* Continue a partial initialization */
|
|
if (type == HUB_INIT2)
|
|
goto init2;
|
|
if (type == HUB_INIT3)
|
|
goto init3;
|
|
|
|
/* The superspeed hub except for root hub has to use Hub Depth
|
|
* value as an offset into the route string to locate the bits
|
|
* it uses to determine the downstream port number. So hub driver
|
|
* should send a set hub depth request to superspeed hub after
|
|
* the superspeed hub is set configuration in initialization or
|
|
* reset procedure.
|
|
*
|
|
* After a resume, port power should still be on.
|
|
* For any other type of activation, turn it on.
|
|
*/
|
|
if (type != HUB_RESUME) {
|
|
if (hdev->parent && hub_is_superspeed(hdev)) {
|
|
ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
|
|
HUB_SET_DEPTH, USB_RT_HUB,
|
|
hdev->level - 1, 0, NULL, 0,
|
|
USB_CTRL_SET_TIMEOUT);
|
|
if (ret < 0)
|
|
dev_err(hub->intfdev,
|
|
"set hub depth failed\n");
|
|
}
|
|
|
|
/* Speed up system boot by using a delayed_work for the
|
|
* hub's initial power-up delays. This is pretty awkward
|
|
* and the implementation looks like a home-brewed sort of
|
|
* setjmp/longjmp, but it saves at least 100 ms for each
|
|
* root hub (assuming usbcore is compiled into the kernel
|
|
* rather than as a module). It adds up.
|
|
*
|
|
* This can't be done for HUB_RESUME or HUB_RESET_RESUME
|
|
* because for those activation types the ports have to be
|
|
* operational when we return. In theory this could be done
|
|
* for HUB_POST_RESET, but it's easier not to.
|
|
*/
|
|
if (type == HUB_INIT) {
|
|
delay = hub_power_on(hub, false);
|
|
PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2);
|
|
schedule_delayed_work(&hub->init_work,
|
|
msecs_to_jiffies(delay));
|
|
|
|
/* Suppress autosuspend until init is done */
|
|
usb_autopm_get_interface_no_resume(
|
|
to_usb_interface(hub->intfdev));
|
|
return; /* Continues at init2: below */
|
|
} else if (type == HUB_RESET_RESUME) {
|
|
/* The internal host controller state for the hub device
|
|
* may be gone after a host power loss on system resume.
|
|
* Update the device's info so the HW knows it's a hub.
|
|
*/
|
|
hcd = bus_to_hcd(hdev->bus);
|
|
if (hcd->driver->update_hub_device) {
|
|
ret = hcd->driver->update_hub_device(hcd, hdev,
|
|
&hub->tt, GFP_NOIO);
|
|
if (ret < 0) {
|
|
dev_err(hub->intfdev, "Host not "
|
|
"accepting hub info "
|
|
"update.\n");
|
|
dev_err(hub->intfdev, "LS/FS devices "
|
|
"and hubs may not work "
|
|
"under this hub\n.");
|
|
}
|
|
}
|
|
hub_power_on(hub, true);
|
|
} else {
|
|
hub_power_on(hub, true);
|
|
}
|
|
}
|
|
init2:
|
|
|
|
/* Check each port and set hub->change_bits to let khubd know
|
|
* which ports need attention.
|
|
*/
|
|
for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
|
|
struct usb_device *udev = hub->ports[port1 - 1]->child;
|
|
u16 portstatus, portchange;
|
|
|
|
portstatus = portchange = 0;
|
|
status = hub_port_status(hub, port1, &portstatus, &portchange);
|
|
if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
|
|
dev_dbg(hub->intfdev,
|
|
"port %d: status %04x change %04x\n",
|
|
port1, portstatus, portchange);
|
|
|
|
/* After anything other than HUB_RESUME (i.e., initialization
|
|
* or any sort of reset), every port should be disabled.
|
|
* Unconnected ports should likewise be disabled (paranoia),
|
|
* and so should ports for which we have no usb_device.
|
|
*/
|
|
if ((portstatus & USB_PORT_STAT_ENABLE) && (
|
|
type != HUB_RESUME ||
|
|
!(portstatus & USB_PORT_STAT_CONNECTION) ||
|
|
!udev ||
|
|
udev->state == USB_STATE_NOTATTACHED)) {
|
|
/*
|
|
* USB3 protocol ports will automatically transition
|
|
* to Enabled state when detect an USB3.0 device attach.
|
|
* Do not disable USB3 protocol ports.
|
|
*/
|
|
if (!hub_is_superspeed(hdev)) {
|
|
clear_port_feature(hdev, port1,
|
|
USB_PORT_FEAT_ENABLE);
|
|
portstatus &= ~USB_PORT_STAT_ENABLE;
|
|
} else {
|
|
/* Pretend that power was lost for USB3 devs */
|
|
portstatus &= ~USB_PORT_STAT_ENABLE;
|
|
}
|
|
}
|
|
|
|
/* Clear status-change flags; we'll debounce later */
|
|
if (portchange & USB_PORT_STAT_C_CONNECTION) {
|
|
need_debounce_delay = true;
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_CONNECTION);
|
|
}
|
|
if (portchange & USB_PORT_STAT_C_ENABLE) {
|
|
need_debounce_delay = true;
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_ENABLE);
|
|
}
|
|
if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
|
|
hub_is_superspeed(hub->hdev)) {
|
|
need_debounce_delay = true;
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_BH_PORT_RESET);
|
|
}
|
|
/* We can forget about a "removed" device when there's a
|
|
* physical disconnect or the connect status changes.
|
|
*/
|
|
if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
|
|
(portchange & USB_PORT_STAT_C_CONNECTION))
|
|
clear_bit(port1, hub->removed_bits);
|
|
|
|
if (!udev || udev->state == USB_STATE_NOTATTACHED) {
|
|
/* Tell khubd to disconnect the device or
|
|
* check for a new connection
|
|
*/
|
|
if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
|
|
set_bit(port1, hub->change_bits);
|
|
|
|
} else if (portstatus & USB_PORT_STAT_ENABLE) {
|
|
bool port_resumed = (portstatus &
|
|
USB_PORT_STAT_LINK_STATE) ==
|
|
USB_SS_PORT_LS_U0;
|
|
/* The power session apparently survived the resume.
|
|
* If there was an overcurrent or suspend change
|
|
* (i.e., remote wakeup request), have khubd
|
|
* take care of it. Look at the port link state
|
|
* for USB 3.0 hubs, since they don't have a suspend
|
|
* change bit, and they don't set the port link change
|
|
* bit on device-initiated resume.
|
|
*/
|
|
if (portchange || (hub_is_superspeed(hub->hdev) &&
|
|
port_resumed))
|
|
set_bit(port1, hub->change_bits);
|
|
|
|
} else if (udev->persist_enabled) {
|
|
#ifdef CONFIG_PM
|
|
udev->reset_resume = 1;
|
|
#endif
|
|
set_bit(port1, hub->change_bits);
|
|
|
|
} else {
|
|
/* The power session is gone; tell khubd */
|
|
usb_set_device_state(udev, USB_STATE_NOTATTACHED);
|
|
set_bit(port1, hub->change_bits);
|
|
}
|
|
}
|
|
|
|
/* If no port-status-change flags were set, we don't need any
|
|
* debouncing. If flags were set we can try to debounce the
|
|
* ports all at once right now, instead of letting khubd do them
|
|
* one at a time later on.
|
|
*
|
|
* If any port-status changes do occur during this delay, khubd
|
|
* will see them later and handle them normally.
|
|
*/
|
|
if (need_debounce_delay) {
|
|
delay = HUB_DEBOUNCE_STABLE;
|
|
|
|
/* Don't do a long sleep inside a workqueue routine */
|
|
if (type == HUB_INIT2) {
|
|
PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3);
|
|
schedule_delayed_work(&hub->init_work,
|
|
msecs_to_jiffies(delay));
|
|
return; /* Continues at init3: below */
|
|
} else {
|
|
msleep(delay);
|
|
}
|
|
}
|
|
init3:
|
|
hub->quiescing = 0;
|
|
|
|
status = usb_submit_urb(hub->urb, GFP_NOIO);
|
|
if (status < 0)
|
|
dev_err(hub->intfdev, "activate --> %d\n", status);
|
|
if (hub->has_indicators && blinkenlights)
|
|
schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
|
|
|
|
/* Scan all ports that need attention */
|
|
kick_khubd(hub);
|
|
|
|
/* Allow autosuspend if it was suppressed */
|
|
if (type <= HUB_INIT3)
|
|
usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
|
|
}
|
|
|
|
/* Implement the continuations for the delays above */
|
|
static void hub_init_func2(struct work_struct *ws)
|
|
{
|
|
struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
|
|
|
|
hub_activate(hub, HUB_INIT2);
|
|
}
|
|
|
|
static void hub_init_func3(struct work_struct *ws)
|
|
{
|
|
struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
|
|
|
|
hub_activate(hub, HUB_INIT3);
|
|
}
|
|
|
|
enum hub_quiescing_type {
|
|
HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
|
|
};
|
|
|
|
static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
|
|
{
|
|
struct usb_device *hdev = hub->hdev;
|
|
int i;
|
|
|
|
cancel_delayed_work_sync(&hub->init_work);
|
|
|
|
/* khubd and related activity won't re-trigger */
|
|
hub->quiescing = 1;
|
|
|
|
if (type != HUB_SUSPEND) {
|
|
/* Disconnect all the children */
|
|
for (i = 0; i < hdev->maxchild; ++i) {
|
|
if (hub->ports[i]->child)
|
|
usb_disconnect(&hub->ports[i]->child);
|
|
}
|
|
}
|
|
|
|
/* Stop khubd and related activity */
|
|
usb_kill_urb(hub->urb);
|
|
if (hub->has_indicators)
|
|
cancel_delayed_work_sync(&hub->leds);
|
|
if (hub->tt.hub)
|
|
cancel_work_sync(&hub->tt.clear_work);
|
|
}
|
|
|
|
/* caller has locked the hub device */
|
|
static int hub_pre_reset(struct usb_interface *intf)
|
|
{
|
|
struct usb_hub *hub = usb_get_intfdata(intf);
|
|
|
|
hub_quiesce(hub, HUB_PRE_RESET);
|
|
return 0;
|
|
}
|
|
|
|
/* caller has locked the hub device */
|
|
static int hub_post_reset(struct usb_interface *intf)
|
|
{
|
|
struct usb_hub *hub = usb_get_intfdata(intf);
|
|
|
|
hub_activate(hub, HUB_POST_RESET);
|
|
return 0;
|
|
}
|
|
|
|
static void usb_port_device_release(struct device *dev)
|
|
{
|
|
struct usb_port *port_dev = to_usb_port(dev);
|
|
|
|
kfree(port_dev);
|
|
}
|
|
|
|
static void usb_hub_remove_port_device(struct usb_hub *hub,
|
|
int port1)
|
|
{
|
|
device_unregister(&hub->ports[port1 - 1]->dev);
|
|
}
|
|
|
|
struct device_type usb_port_device_type = {
|
|
.name = "usb_port",
|
|
.release = usb_port_device_release,
|
|
};
|
|
|
|
static int usb_hub_create_port_device(struct usb_hub *hub,
|
|
int port1)
|
|
{
|
|
struct usb_port *port_dev = NULL;
|
|
int retval;
|
|
|
|
port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL);
|
|
if (!port_dev) {
|
|
retval = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
hub->ports[port1 - 1] = port_dev;
|
|
port_dev->dev.parent = hub->intfdev;
|
|
port_dev->dev.groups = port_dev_group;
|
|
port_dev->dev.type = &usb_port_device_type;
|
|
dev_set_name(&port_dev->dev, "port%d", port1);
|
|
|
|
retval = device_register(&port_dev->dev);
|
|
if (retval)
|
|
goto error_register;
|
|
return 0;
|
|
|
|
error_register:
|
|
put_device(&port_dev->dev);
|
|
exit:
|
|
return retval;
|
|
}
|
|
|
|
static int hub_configure(struct usb_hub *hub,
|
|
struct usb_endpoint_descriptor *endpoint)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
struct usb_device *hdev = hub->hdev;
|
|
struct device *hub_dev = hub->intfdev;
|
|
u16 hubstatus, hubchange;
|
|
u16 wHubCharacteristics;
|
|
unsigned int pipe;
|
|
int maxp, ret, i;
|
|
char *message = "out of memory";
|
|
|
|
hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL);
|
|
if (!hub->buffer) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
|
|
if (!hub->status) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
mutex_init(&hub->status_mutex);
|
|
|
|
hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
|
|
if (!hub->descriptor) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
/* Request the entire hub descriptor.
|
|
* hub->descriptor can handle USB_MAXCHILDREN ports,
|
|
* but the hub can/will return fewer bytes here.
|
|
*/
|
|
ret = get_hub_descriptor(hdev, hub->descriptor);
|
|
if (ret < 0) {
|
|
message = "can't read hub descriptor";
|
|
goto fail;
|
|
} else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
|
|
message = "hub has too many ports!";
|
|
ret = -ENODEV;
|
|
goto fail;
|
|
}
|
|
|
|
hdev->maxchild = hub->descriptor->bNbrPorts;
|
|
dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
|
|
(hdev->maxchild == 1) ? "" : "s");
|
|
|
|
hub->ports = kzalloc(hdev->maxchild * sizeof(struct usb_port *),
|
|
GFP_KERNEL);
|
|
if (!hub->ports) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
|
|
|
|
/* FIXME for USB 3.0, skip for now */
|
|
if ((wHubCharacteristics & HUB_CHAR_COMPOUND) &&
|
|
!(hub_is_superspeed(hdev))) {
|
|
int i;
|
|
char portstr [USB_MAXCHILDREN + 1];
|
|
|
|
for (i = 0; i < hdev->maxchild; i++)
|
|
portstr[i] = hub->descriptor->u.hs.DeviceRemovable
|
|
[((i + 1) / 8)] & (1 << ((i + 1) % 8))
|
|
? 'F' : 'R';
|
|
portstr[hdev->maxchild] = 0;
|
|
dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
|
|
} else
|
|
dev_dbg(hub_dev, "standalone hub\n");
|
|
|
|
switch (wHubCharacteristics & HUB_CHAR_LPSM) {
|
|
case HUB_CHAR_COMMON_LPSM:
|
|
dev_dbg(hub_dev, "ganged power switching\n");
|
|
break;
|
|
case HUB_CHAR_INDV_PORT_LPSM:
|
|
dev_dbg(hub_dev, "individual port power switching\n");
|
|
break;
|
|
case HUB_CHAR_NO_LPSM:
|
|
case HUB_CHAR_LPSM:
|
|
dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
|
|
break;
|
|
}
|
|
|
|
switch (wHubCharacteristics & HUB_CHAR_OCPM) {
|
|
case HUB_CHAR_COMMON_OCPM:
|
|
dev_dbg(hub_dev, "global over-current protection\n");
|
|
break;
|
|
case HUB_CHAR_INDV_PORT_OCPM:
|
|
dev_dbg(hub_dev, "individual port over-current protection\n");
|
|
break;
|
|
case HUB_CHAR_NO_OCPM:
|
|
case HUB_CHAR_OCPM:
|
|
dev_dbg(hub_dev, "no over-current protection\n");
|
|
break;
|
|
}
|
|
|
|
spin_lock_init (&hub->tt.lock);
|
|
INIT_LIST_HEAD (&hub->tt.clear_list);
|
|
INIT_WORK(&hub->tt.clear_work, hub_tt_work);
|
|
switch (hdev->descriptor.bDeviceProtocol) {
|
|
case USB_HUB_PR_FS:
|
|
break;
|
|
case USB_HUB_PR_HS_SINGLE_TT:
|
|
dev_dbg(hub_dev, "Single TT\n");
|
|
hub->tt.hub = hdev;
|
|
break;
|
|
case USB_HUB_PR_HS_MULTI_TT:
|
|
ret = usb_set_interface(hdev, 0, 1);
|
|
if (ret == 0) {
|
|
dev_dbg(hub_dev, "TT per port\n");
|
|
hub->tt.multi = 1;
|
|
} else
|
|
dev_err(hub_dev, "Using single TT (err %d)\n",
|
|
ret);
|
|
hub->tt.hub = hdev;
|
|
break;
|
|
case USB_HUB_PR_SS:
|
|
/* USB 3.0 hubs don't have a TT */
|
|
break;
|
|
default:
|
|
dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
|
|
hdev->descriptor.bDeviceProtocol);
|
|
break;
|
|
}
|
|
|
|
/* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
|
|
switch (wHubCharacteristics & HUB_CHAR_TTTT) {
|
|
case HUB_TTTT_8_BITS:
|
|
if (hdev->descriptor.bDeviceProtocol != 0) {
|
|
hub->tt.think_time = 666;
|
|
dev_dbg(hub_dev, "TT requires at most %d "
|
|
"FS bit times (%d ns)\n",
|
|
8, hub->tt.think_time);
|
|
}
|
|
break;
|
|
case HUB_TTTT_16_BITS:
|
|
hub->tt.think_time = 666 * 2;
|
|
dev_dbg(hub_dev, "TT requires at most %d "
|
|
"FS bit times (%d ns)\n",
|
|
16, hub->tt.think_time);
|
|
break;
|
|
case HUB_TTTT_24_BITS:
|
|
hub->tt.think_time = 666 * 3;
|
|
dev_dbg(hub_dev, "TT requires at most %d "
|
|
"FS bit times (%d ns)\n",
|
|
24, hub->tt.think_time);
|
|
break;
|
|
case HUB_TTTT_32_BITS:
|
|
hub->tt.think_time = 666 * 4;
|
|
dev_dbg(hub_dev, "TT requires at most %d "
|
|
"FS bit times (%d ns)\n",
|
|
32, hub->tt.think_time);
|
|
break;
|
|
}
|
|
|
|
/* probe() zeroes hub->indicator[] */
|
|
if (wHubCharacteristics & HUB_CHAR_PORTIND) {
|
|
hub->has_indicators = 1;
|
|
dev_dbg(hub_dev, "Port indicators are supported\n");
|
|
}
|
|
|
|
dev_dbg(hub_dev, "power on to power good time: %dms\n",
|
|
hub->descriptor->bPwrOn2PwrGood * 2);
|
|
|
|
/* power budgeting mostly matters with bus-powered hubs,
|
|
* and battery-powered root hubs (may provide just 8 mA).
|
|
*/
|
|
ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
|
|
if (ret < 2) {
|
|
message = "can't get hub status";
|
|
goto fail;
|
|
}
|
|
le16_to_cpus(&hubstatus);
|
|
if (hdev == hdev->bus->root_hub) {
|
|
if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
|
|
hub->mA_per_port = 500;
|
|
else {
|
|
hub->mA_per_port = hdev->bus_mA;
|
|
hub->limited_power = 1;
|
|
}
|
|
} else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
|
|
dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
|
|
hub->descriptor->bHubContrCurrent);
|
|
hub->limited_power = 1;
|
|
if (hdev->maxchild > 0) {
|
|
int remaining = hdev->bus_mA -
|
|
hub->descriptor->bHubContrCurrent;
|
|
|
|
if (remaining < hdev->maxchild * 100)
|
|
dev_warn(hub_dev,
|
|
"insufficient power available "
|
|
"to use all downstream ports\n");
|
|
hub->mA_per_port = 100; /* 7.2.1.1 */
|
|
}
|
|
} else { /* Self-powered external hub */
|
|
/* FIXME: What about battery-powered external hubs that
|
|
* provide less current per port? */
|
|
hub->mA_per_port = 500;
|
|
}
|
|
if (hub->mA_per_port < 500)
|
|
dev_dbg(hub_dev, "%umA bus power budget for each child\n",
|
|
hub->mA_per_port);
|
|
|
|
/* Update the HCD's internal representation of this hub before khubd
|
|
* starts getting port status changes for devices under the hub.
|
|
*/
|
|
hcd = bus_to_hcd(hdev->bus);
|
|
if (hcd->driver->update_hub_device) {
|
|
ret = hcd->driver->update_hub_device(hcd, hdev,
|
|
&hub->tt, GFP_KERNEL);
|
|
if (ret < 0) {
|
|
message = "can't update HCD hub info";
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
ret = hub_hub_status(hub, &hubstatus, &hubchange);
|
|
if (ret < 0) {
|
|
message = "can't get hub status";
|
|
goto fail;
|
|
}
|
|
|
|
/* local power status reports aren't always correct */
|
|
if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
|
|
dev_dbg(hub_dev, "local power source is %s\n",
|
|
(hubstatus & HUB_STATUS_LOCAL_POWER)
|
|
? "lost (inactive)" : "good");
|
|
|
|
if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
|
|
dev_dbg(hub_dev, "%sover-current condition exists\n",
|
|
(hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
|
|
|
|
/* set up the interrupt endpoint
|
|
* We use the EP's maxpacket size instead of (PORTS+1+7)/8
|
|
* bytes as USB2.0[11.12.3] says because some hubs are known
|
|
* to send more data (and thus cause overflow). For root hubs,
|
|
* maxpktsize is defined in hcd.c's fake endpoint descriptors
|
|
* to be big enough for at least USB_MAXCHILDREN ports. */
|
|
pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
|
|
maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
|
|
|
|
if (maxp > sizeof(*hub->buffer))
|
|
maxp = sizeof(*hub->buffer);
|
|
|
|
hub->urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!hub->urb) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
|
|
hub, endpoint->bInterval);
|
|
|
|
/* maybe cycle the hub leds */
|
|
if (hub->has_indicators && blinkenlights)
|
|
hub->indicator [0] = INDICATOR_CYCLE;
|
|
|
|
for (i = 0; i < hdev->maxchild; i++)
|
|
if (usb_hub_create_port_device(hub, i + 1) < 0)
|
|
dev_err(hub->intfdev,
|
|
"couldn't create port%d device.\n", i + 1);
|
|
|
|
hub_activate(hub, HUB_INIT);
|
|
return 0;
|
|
|
|
fail:
|
|
dev_err (hub_dev, "config failed, %s (err %d)\n",
|
|
message, ret);
|
|
/* hub_disconnect() frees urb and descriptor */
|
|
return ret;
|
|
}
|
|
|
|
static void hub_release(struct kref *kref)
|
|
{
|
|
struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
|
|
|
|
usb_put_intf(to_usb_interface(hub->intfdev));
|
|
kfree(hub);
|
|
}
|
|
|
|
static unsigned highspeed_hubs;
|
|
|
|
static void hub_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct usb_hub *hub = usb_get_intfdata(intf);
|
|
struct usb_device *hdev = interface_to_usbdev(intf);
|
|
int i;
|
|
|
|
/* Take the hub off the event list and don't let it be added again */
|
|
spin_lock_irq(&hub_event_lock);
|
|
if (!list_empty(&hub->event_list)) {
|
|
list_del_init(&hub->event_list);
|
|
usb_autopm_put_interface_no_suspend(intf);
|
|
}
|
|
hub->disconnected = 1;
|
|
spin_unlock_irq(&hub_event_lock);
|
|
|
|
/* Disconnect all children and quiesce the hub */
|
|
hub->error = 0;
|
|
hub_quiesce(hub, HUB_DISCONNECT);
|
|
|
|
usb_set_intfdata (intf, NULL);
|
|
|
|
for (i = 0; i < hdev->maxchild; i++)
|
|
usb_hub_remove_port_device(hub, i + 1);
|
|
hub->hdev->maxchild = 0;
|
|
|
|
if (hub->hdev->speed == USB_SPEED_HIGH)
|
|
highspeed_hubs--;
|
|
|
|
usb_free_urb(hub->urb);
|
|
kfree(hub->ports);
|
|
kfree(hub->descriptor);
|
|
kfree(hub->status);
|
|
kfree(hub->buffer);
|
|
|
|
kref_put(&hub->kref, hub_release);
|
|
}
|
|
|
|
static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
|
|
{
|
|
struct usb_host_interface *desc;
|
|
struct usb_endpoint_descriptor *endpoint;
|
|
struct usb_device *hdev;
|
|
struct usb_hub *hub;
|
|
|
|
desc = intf->cur_altsetting;
|
|
hdev = interface_to_usbdev(intf);
|
|
|
|
/* Hubs have proper suspend/resume support. */
|
|
usb_enable_autosuspend(hdev);
|
|
|
|
if (hdev->level == MAX_TOPO_LEVEL) {
|
|
dev_err(&intf->dev,
|
|
"Unsupported bus topology: hub nested too deep\n");
|
|
return -E2BIG;
|
|
}
|
|
|
|
#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
|
|
if (hdev->parent) {
|
|
dev_warn(&intf->dev, "ignoring external hub\n");
|
|
return -ENODEV;
|
|
}
|
|
#endif
|
|
|
|
/* Some hubs have a subclass of 1, which AFAICT according to the */
|
|
/* specs is not defined, but it works */
|
|
if ((desc->desc.bInterfaceSubClass != 0) &&
|
|
(desc->desc.bInterfaceSubClass != 1)) {
|
|
descriptor_error:
|
|
dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/* Multiple endpoints? What kind of mutant ninja-hub is this? */
|
|
if (desc->desc.bNumEndpoints != 1)
|
|
goto descriptor_error;
|
|
|
|
endpoint = &desc->endpoint[0].desc;
|
|
|
|
/* If it's not an interrupt in endpoint, we'd better punt! */
|
|
if (!usb_endpoint_is_int_in(endpoint))
|
|
goto descriptor_error;
|
|
|
|
/* We found a hub */
|
|
dev_info (&intf->dev, "USB hub found\n");
|
|
|
|
hub = kzalloc(sizeof(*hub), GFP_KERNEL);
|
|
if (!hub) {
|
|
dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
kref_init(&hub->kref);
|
|
INIT_LIST_HEAD(&hub->event_list);
|
|
hub->intfdev = &intf->dev;
|
|
hub->hdev = hdev;
|
|
INIT_DELAYED_WORK(&hub->leds, led_work);
|
|
INIT_DELAYED_WORK(&hub->init_work, NULL);
|
|
usb_get_intf(intf);
|
|
|
|
usb_set_intfdata (intf, hub);
|
|
intf->needs_remote_wakeup = 1;
|
|
|
|
if (hdev->speed == USB_SPEED_HIGH)
|
|
highspeed_hubs++;
|
|
|
|
if (hub_configure(hub, endpoint) >= 0)
|
|
return 0;
|
|
|
|
hub_disconnect (intf);
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int
|
|
hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
|
|
{
|
|
struct usb_device *hdev = interface_to_usbdev (intf);
|
|
struct usb_hub *hub = hdev_to_hub(hdev);
|
|
|
|
/* assert ifno == 0 (part of hub spec) */
|
|
switch (code) {
|
|
case USBDEVFS_HUB_PORTINFO: {
|
|
struct usbdevfs_hub_portinfo *info = user_data;
|
|
int i;
|
|
|
|
spin_lock_irq(&device_state_lock);
|
|
if (hdev->devnum <= 0)
|
|
info->nports = 0;
|
|
else {
|
|
info->nports = hdev->maxchild;
|
|
for (i = 0; i < info->nports; i++) {
|
|
if (hub->ports[i]->child == NULL)
|
|
info->port[i] = 0;
|
|
else
|
|
info->port[i] =
|
|
hub->ports[i]->child->devnum;
|
|
}
|
|
}
|
|
spin_unlock_irq(&device_state_lock);
|
|
|
|
return info->nports + 1;
|
|
}
|
|
|
|
default:
|
|
return -ENOSYS;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allow user programs to claim ports on a hub. When a device is attached
|
|
* to one of these "claimed" ports, the program will "own" the device.
|
|
*/
|
|
static int find_port_owner(struct usb_device *hdev, unsigned port1,
|
|
struct dev_state ***ppowner)
|
|
{
|
|
if (hdev->state == USB_STATE_NOTATTACHED)
|
|
return -ENODEV;
|
|
if (port1 == 0 || port1 > hdev->maxchild)
|
|
return -EINVAL;
|
|
|
|
/* This assumes that devices not managed by the hub driver
|
|
* will always have maxchild equal to 0.
|
|
*/
|
|
*ppowner = &(hdev_to_hub(hdev)->ports[port1 - 1]->port_owner);
|
|
return 0;
|
|
}
|
|
|
|
/* In the following three functions, the caller must hold hdev's lock */
|
|
int usb_hub_claim_port(struct usb_device *hdev, unsigned port1,
|
|
struct dev_state *owner)
|
|
{
|
|
int rc;
|
|
struct dev_state **powner;
|
|
|
|
rc = find_port_owner(hdev, port1, &powner);
|
|
if (rc)
|
|
return rc;
|
|
if (*powner)
|
|
return -EBUSY;
|
|
*powner = owner;
|
|
return rc;
|
|
}
|
|
|
|
int usb_hub_release_port(struct usb_device *hdev, unsigned port1,
|
|
struct dev_state *owner)
|
|
{
|
|
int rc;
|
|
struct dev_state **powner;
|
|
|
|
rc = find_port_owner(hdev, port1, &powner);
|
|
if (rc)
|
|
return rc;
|
|
if (*powner != owner)
|
|
return -ENOENT;
|
|
*powner = NULL;
|
|
return rc;
|
|
}
|
|
|
|
void usb_hub_release_all_ports(struct usb_device *hdev, struct dev_state *owner)
|
|
{
|
|
struct usb_hub *hub = hdev_to_hub(hdev);
|
|
int n;
|
|
|
|
for (n = 0; n < hdev->maxchild; n++) {
|
|
if (hub->ports[n]->port_owner == owner)
|
|
hub->ports[n]->port_owner = NULL;
|
|
}
|
|
|
|
}
|
|
|
|
/* The caller must hold udev's lock */
|
|
bool usb_device_is_owned(struct usb_device *udev)
|
|
{
|
|
struct usb_hub *hub;
|
|
|
|
if (udev->state == USB_STATE_NOTATTACHED || !udev->parent)
|
|
return false;
|
|
hub = hdev_to_hub(udev->parent);
|
|
return !!hub->ports[udev->portnum - 1]->port_owner;
|
|
}
|
|
|
|
static void recursively_mark_NOTATTACHED(struct usb_device *udev)
|
|
{
|
|
struct usb_hub *hub = hdev_to_hub(udev);
|
|
int i;
|
|
|
|
for (i = 0; i < udev->maxchild; ++i) {
|
|
if (hub->ports[i]->child)
|
|
recursively_mark_NOTATTACHED(hub->ports[i]->child);
|
|
}
|
|
if (udev->state == USB_STATE_SUSPENDED)
|
|
udev->active_duration -= jiffies;
|
|
udev->state = USB_STATE_NOTATTACHED;
|
|
}
|
|
|
|
/**
|
|
* usb_set_device_state - change a device's current state (usbcore, hcds)
|
|
* @udev: pointer to device whose state should be changed
|
|
* @new_state: new state value to be stored
|
|
*
|
|
* udev->state is _not_ fully protected by the device lock. Although
|
|
* most transitions are made only while holding the lock, the state can
|
|
* can change to USB_STATE_NOTATTACHED at almost any time. This
|
|
* is so that devices can be marked as disconnected as soon as possible,
|
|
* without having to wait for any semaphores to be released. As a result,
|
|
* all changes to any device's state must be protected by the
|
|
* device_state_lock spinlock.
|
|
*
|
|
* Once a device has been added to the device tree, all changes to its state
|
|
* should be made using this routine. The state should _not_ be set directly.
|
|
*
|
|
* If udev->state is already USB_STATE_NOTATTACHED then no change is made.
|
|
* Otherwise udev->state is set to new_state, and if new_state is
|
|
* USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
|
|
* to USB_STATE_NOTATTACHED.
|
|
*/
|
|
void usb_set_device_state(struct usb_device *udev,
|
|
enum usb_device_state new_state)
|
|
{
|
|
unsigned long flags;
|
|
int wakeup = -1;
|
|
|
|
spin_lock_irqsave(&device_state_lock, flags);
|
|
if (udev->state == USB_STATE_NOTATTACHED)
|
|
; /* do nothing */
|
|
else if (new_state != USB_STATE_NOTATTACHED) {
|
|
|
|
/* root hub wakeup capabilities are managed out-of-band
|
|
* and may involve silicon errata ... ignore them here.
|
|
*/
|
|
if (udev->parent) {
|
|
if (udev->state == USB_STATE_SUSPENDED
|
|
|| new_state == USB_STATE_SUSPENDED)
|
|
; /* No change to wakeup settings */
|
|
else if (new_state == USB_STATE_CONFIGURED)
|
|
wakeup = udev->actconfig->desc.bmAttributes
|
|
& USB_CONFIG_ATT_WAKEUP;
|
|
else
|
|
wakeup = 0;
|
|
}
|
|
if (udev->state == USB_STATE_SUSPENDED &&
|
|
new_state != USB_STATE_SUSPENDED)
|
|
udev->active_duration -= jiffies;
|
|
else if (new_state == USB_STATE_SUSPENDED &&
|
|
udev->state != USB_STATE_SUSPENDED)
|
|
udev->active_duration += jiffies;
|
|
udev->state = new_state;
|
|
} else
|
|
recursively_mark_NOTATTACHED(udev);
|
|
spin_unlock_irqrestore(&device_state_lock, flags);
|
|
if (wakeup >= 0)
|
|
device_set_wakeup_capable(&udev->dev, wakeup);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_set_device_state);
|
|
|
|
/*
|
|
* Choose a device number.
|
|
*
|
|
* Device numbers are used as filenames in usbfs. On USB-1.1 and
|
|
* USB-2.0 buses they are also used as device addresses, however on
|
|
* USB-3.0 buses the address is assigned by the controller hardware
|
|
* and it usually is not the same as the device number.
|
|
*
|
|
* WUSB devices are simple: they have no hubs behind, so the mapping
|
|
* device <-> virtual port number becomes 1:1. Why? to simplify the
|
|
* life of the device connection logic in
|
|
* drivers/usb/wusbcore/devconnect.c. When we do the initial secret
|
|
* handshake we need to assign a temporary address in the unauthorized
|
|
* space. For simplicity we use the first virtual port number found to
|
|
* be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
|
|
* and that becomes it's address [X < 128] or its unauthorized address
|
|
* [X | 0x80].
|
|
*
|
|
* We add 1 as an offset to the one-based USB-stack port number
|
|
* (zero-based wusb virtual port index) for two reasons: (a) dev addr
|
|
* 0 is reserved by USB for default address; (b) Linux's USB stack
|
|
* uses always #1 for the root hub of the controller. So USB stack's
|
|
* port #1, which is wusb virtual-port #0 has address #2.
|
|
*
|
|
* Devices connected under xHCI are not as simple. The host controller
|
|
* supports virtualization, so the hardware assigns device addresses and
|
|
* the HCD must setup data structures before issuing a set address
|
|
* command to the hardware.
|
|
*/
|
|
static void choose_devnum(struct usb_device *udev)
|
|
{
|
|
int devnum;
|
|
struct usb_bus *bus = udev->bus;
|
|
|
|
/* If khubd ever becomes multithreaded, this will need a lock */
|
|
if (udev->wusb) {
|
|
devnum = udev->portnum + 1;
|
|
BUG_ON(test_bit(devnum, bus->devmap.devicemap));
|
|
} else {
|
|
/* Try to allocate the next devnum beginning at
|
|
* bus->devnum_next. */
|
|
devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
|
|
bus->devnum_next);
|
|
if (devnum >= 128)
|
|
devnum = find_next_zero_bit(bus->devmap.devicemap,
|
|
128, 1);
|
|
bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
|
|
}
|
|
if (devnum < 128) {
|
|
set_bit(devnum, bus->devmap.devicemap);
|
|
udev->devnum = devnum;
|
|
}
|
|
}
|
|
|
|
static void release_devnum(struct usb_device *udev)
|
|
{
|
|
if (udev->devnum > 0) {
|
|
clear_bit(udev->devnum, udev->bus->devmap.devicemap);
|
|
udev->devnum = -1;
|
|
}
|
|
}
|
|
|
|
static void update_devnum(struct usb_device *udev, int devnum)
|
|
{
|
|
/* The address for a WUSB device is managed by wusbcore. */
|
|
if (!udev->wusb)
|
|
udev->devnum = devnum;
|
|
}
|
|
|
|
static void hub_free_dev(struct usb_device *udev)
|
|
{
|
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
|
|
|
|
/* Root hubs aren't real devices, so don't free HCD resources */
|
|
if (hcd->driver->free_dev && udev->parent)
|
|
hcd->driver->free_dev(hcd, udev);
|
|
}
|
|
|
|
/**
|
|
* usb_disconnect - disconnect a device (usbcore-internal)
|
|
* @pdev: pointer to device being disconnected
|
|
* Context: !in_interrupt ()
|
|
*
|
|
* Something got disconnected. Get rid of it and all of its children.
|
|
*
|
|
* If *pdev is a normal device then the parent hub must already be locked.
|
|
* If *pdev is a root hub then this routine will acquire the
|
|
* usb_bus_list_lock on behalf of the caller.
|
|
*
|
|
* Only hub drivers (including virtual root hub drivers for host
|
|
* controllers) should ever call this.
|
|
*
|
|
* This call is synchronous, and may not be used in an interrupt context.
|
|
*/
|
|
void usb_disconnect(struct usb_device **pdev)
|
|
{
|
|
struct usb_device *udev = *pdev;
|
|
struct usb_hub *hub = hdev_to_hub(udev);
|
|
int i;
|
|
|
|
/* mark the device as inactive, so any further urb submissions for
|
|
* this device (and any of its children) will fail immediately.
|
|
* this quiesces everything except pending urbs.
|
|
*/
|
|
usb_set_device_state(udev, USB_STATE_NOTATTACHED);
|
|
dev_info(&udev->dev, "USB disconnect, device number %d\n",
|
|
udev->devnum);
|
|
|
|
usb_lock_device(udev);
|
|
|
|
/* Free up all the children before we remove this device */
|
|
for (i = 0; i < udev->maxchild; i++) {
|
|
if (hub->ports[i]->child)
|
|
usb_disconnect(&hub->ports[i]->child);
|
|
}
|
|
|
|
/* deallocate hcd/hardware state ... nuking all pending urbs and
|
|
* cleaning up all state associated with the current configuration
|
|
* so that the hardware is now fully quiesced.
|
|
*/
|
|
dev_dbg (&udev->dev, "unregistering device\n");
|
|
usb_disable_device(udev, 0);
|
|
usb_hcd_synchronize_unlinks(udev);
|
|
|
|
usb_remove_ep_devs(&udev->ep0);
|
|
usb_unlock_device(udev);
|
|
|
|
/* Unregister the device. The device driver is responsible
|
|
* for de-configuring the device and invoking the remove-device
|
|
* notifier chain (used by usbfs and possibly others).
|
|
*/
|
|
device_del(&udev->dev);
|
|
|
|
/* Free the device number and delete the parent's children[]
|
|
* (or root_hub) pointer.
|
|
*/
|
|
release_devnum(udev);
|
|
|
|
/* Avoid races with recursively_mark_NOTATTACHED() */
|
|
spin_lock_irq(&device_state_lock);
|
|
*pdev = NULL;
|
|
spin_unlock_irq(&device_state_lock);
|
|
|
|
hub_free_dev(udev);
|
|
|
|
put_device(&udev->dev);
|
|
}
|
|
|
|
#ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
|
|
static void show_string(struct usb_device *udev, char *id, char *string)
|
|
{
|
|
if (!string)
|
|
return;
|
|
dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
|
|
}
|
|
|
|
static void announce_device(struct usb_device *udev)
|
|
{
|
|
dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
|
|
le16_to_cpu(udev->descriptor.idVendor),
|
|
le16_to_cpu(udev->descriptor.idProduct));
|
|
dev_info(&udev->dev,
|
|
"New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
|
|
udev->descriptor.iManufacturer,
|
|
udev->descriptor.iProduct,
|
|
udev->descriptor.iSerialNumber);
|
|
show_string(udev, "Product", udev->product);
|
|
show_string(udev, "Manufacturer", udev->manufacturer);
|
|
show_string(udev, "SerialNumber", udev->serial);
|
|
}
|
|
#else
|
|
static inline void announce_device(struct usb_device *udev) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_USB_OTG
|
|
#include "otg_whitelist.h"
|
|
#endif
|
|
|
|
/**
|
|
* usb_enumerate_device_otg - FIXME (usbcore-internal)
|
|
* @udev: newly addressed device (in ADDRESS state)
|
|
*
|
|
* Finish enumeration for On-The-Go devices
|
|
*/
|
|
static int usb_enumerate_device_otg(struct usb_device *udev)
|
|
{
|
|
int err = 0;
|
|
|
|
#ifdef CONFIG_USB_OTG
|
|
/*
|
|
* OTG-aware devices on OTG-capable root hubs may be able to use SRP,
|
|
* to wake us after we've powered off VBUS; and HNP, switching roles
|
|
* "host" to "peripheral". The OTG descriptor helps figure this out.
|
|
*/
|
|
if (!udev->bus->is_b_host
|
|
&& udev->config
|
|
&& udev->parent == udev->bus->root_hub) {
|
|
struct usb_otg_descriptor *desc = NULL;
|
|
struct usb_bus *bus = udev->bus;
|
|
|
|
/* descriptor may appear anywhere in config */
|
|
if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
|
|
le16_to_cpu(udev->config[0].desc.wTotalLength),
|
|
USB_DT_OTG, (void **) &desc) == 0) {
|
|
if (desc->bmAttributes & USB_OTG_HNP) {
|
|
unsigned port1 = udev->portnum;
|
|
|
|
dev_info(&udev->dev,
|
|
"Dual-Role OTG device on %sHNP port\n",
|
|
(port1 == bus->otg_port)
|
|
? "" : "non-");
|
|
|
|
/* enable HNP before suspend, it's simpler */
|
|
if (port1 == bus->otg_port)
|
|
bus->b_hnp_enable = 1;
|
|
err = usb_control_msg(udev,
|
|
usb_sndctrlpipe(udev, 0),
|
|
USB_REQ_SET_FEATURE, 0,
|
|
bus->b_hnp_enable
|
|
? USB_DEVICE_B_HNP_ENABLE
|
|
: USB_DEVICE_A_ALT_HNP_SUPPORT,
|
|
0, NULL, 0, USB_CTRL_SET_TIMEOUT);
|
|
if (err < 0) {
|
|
/* OTG MESSAGE: report errors here,
|
|
* customize to match your product.
|
|
*/
|
|
dev_info(&udev->dev,
|
|
"can't set HNP mode: %d\n",
|
|
err);
|
|
bus->b_hnp_enable = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!is_targeted(udev)) {
|
|
|
|
/* Maybe it can talk to us, though we can't talk to it.
|
|
* (Includes HNP test device.)
|
|
*/
|
|
if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
|
|
err = usb_port_suspend(udev, PMSG_SUSPEND);
|
|
if (err < 0)
|
|
dev_dbg(&udev->dev, "HNP fail, %d\n", err);
|
|
}
|
|
err = -ENOTSUPP;
|
|
goto fail;
|
|
}
|
|
fail:
|
|
#endif
|
|
return err;
|
|
}
|
|
|
|
|
|
/**
|
|
* usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
|
|
* @udev: newly addressed device (in ADDRESS state)
|
|
*
|
|
* This is only called by usb_new_device() and usb_authorize_device()
|
|
* and FIXME -- all comments that apply to them apply here wrt to
|
|
* environment.
|
|
*
|
|
* If the device is WUSB and not authorized, we don't attempt to read
|
|
* the string descriptors, as they will be errored out by the device
|
|
* until it has been authorized.
|
|
*/
|
|
static int usb_enumerate_device(struct usb_device *udev)
|
|
{
|
|
int err;
|
|
|
|
if (udev->config == NULL) {
|
|
err = usb_get_configuration(udev);
|
|
if (err < 0) {
|
|
dev_err(&udev->dev, "can't read configurations, error %d\n",
|
|
err);
|
|
return err;
|
|
}
|
|
}
|
|
if (udev->wusb == 1 && udev->authorized == 0) {
|
|
udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
|
|
udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
|
|
udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
|
|
}
|
|
else {
|
|
/* read the standard strings and cache them if present */
|
|
udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
|
|
udev->manufacturer = usb_cache_string(udev,
|
|
udev->descriptor.iManufacturer);
|
|
udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
|
|
}
|
|
err = usb_enumerate_device_otg(udev);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
usb_detect_interface_quirks(udev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void set_usb_port_removable(struct usb_device *udev)
|
|
{
|
|
struct usb_device *hdev = udev->parent;
|
|
struct usb_hub *hub;
|
|
u8 port = udev->portnum;
|
|
u16 wHubCharacteristics;
|
|
bool removable = true;
|
|
|
|
if (!hdev)
|
|
return;
|
|
|
|
hub = hdev_to_hub(udev->parent);
|
|
|
|
wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
|
|
|
|
if (!(wHubCharacteristics & HUB_CHAR_COMPOUND))
|
|
return;
|
|
|
|
if (hub_is_superspeed(hdev)) {
|
|
if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable)
|
|
& (1 << port))
|
|
removable = false;
|
|
} else {
|
|
if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8)))
|
|
removable = false;
|
|
}
|
|
|
|
if (removable)
|
|
udev->removable = USB_DEVICE_REMOVABLE;
|
|
else
|
|
udev->removable = USB_DEVICE_FIXED;
|
|
}
|
|
|
|
/**
|
|
* usb_new_device - perform initial device setup (usbcore-internal)
|
|
* @udev: newly addressed device (in ADDRESS state)
|
|
*
|
|
* This is called with devices which have been detected but not fully
|
|
* enumerated. The device descriptor is available, but not descriptors
|
|
* for any device configuration. The caller must have locked either
|
|
* the parent hub (if udev is a normal device) or else the
|
|
* usb_bus_list_lock (if udev is a root hub). The parent's pointer to
|
|
* udev has already been installed, but udev is not yet visible through
|
|
* sysfs or other filesystem code.
|
|
*
|
|
* It will return if the device is configured properly or not. Zero if
|
|
* the interface was registered with the driver core; else a negative
|
|
* errno value.
|
|
*
|
|
* This call is synchronous, and may not be used in an interrupt context.
|
|
*
|
|
* Only the hub driver or root-hub registrar should ever call this.
|
|
*/
|
|
int usb_new_device(struct usb_device *udev)
|
|
{
|
|
int err;
|
|
|
|
if (udev->parent) {
|
|
/* Initialize non-root-hub device wakeup to disabled;
|
|
* device (un)configuration controls wakeup capable
|
|
* sysfs power/wakeup controls wakeup enabled/disabled
|
|
*/
|
|
device_init_wakeup(&udev->dev, 0);
|
|
}
|
|
|
|
/* Tell the runtime-PM framework the device is active */
|
|
pm_runtime_set_active(&udev->dev);
|
|
pm_runtime_get_noresume(&udev->dev);
|
|
pm_runtime_use_autosuspend(&udev->dev);
|
|
pm_runtime_enable(&udev->dev);
|
|
|
|
/* By default, forbid autosuspend for all devices. It will be
|
|
* allowed for hubs during binding.
|
|
*/
|
|
usb_disable_autosuspend(udev);
|
|
|
|
err = usb_enumerate_device(udev); /* Read descriptors */
|
|
if (err < 0)
|
|
goto fail;
|
|
dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n",
|
|
udev->devnum, udev->bus->busnum,
|
|
(((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
|
|
/* export the usbdev device-node for libusb */
|
|
udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
|
|
(((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
|
|
|
|
/* Tell the world! */
|
|
announce_device(udev);
|
|
|
|
if (udev->serial)
|
|
add_device_randomness(udev->serial, strlen(udev->serial));
|
|
if (udev->product)
|
|
add_device_randomness(udev->product, strlen(udev->product));
|
|
if (udev->manufacturer)
|
|
add_device_randomness(udev->manufacturer,
|
|
strlen(udev->manufacturer));
|
|
|
|
device_enable_async_suspend(&udev->dev);
|
|
|
|
/*
|
|
* check whether the hub marks this port as non-removable. Do it
|
|
* now so that platform-specific data can override it in
|
|
* device_add()
|
|
*/
|
|
if (udev->parent)
|
|
set_usb_port_removable(udev);
|
|
|
|
/* Register the device. The device driver is responsible
|
|
* for configuring the device and invoking the add-device
|
|
* notifier chain (used by usbfs and possibly others).
|
|
*/
|
|
err = device_add(&udev->dev);
|
|
if (err) {
|
|
dev_err(&udev->dev, "can't device_add, error %d\n", err);
|
|
goto fail;
|
|
}
|
|
|
|
(void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
|
|
usb_mark_last_busy(udev);
|
|
pm_runtime_put_sync_autosuspend(&udev->dev);
|
|
return err;
|
|
|
|
fail:
|
|
usb_set_device_state(udev, USB_STATE_NOTATTACHED);
|
|
pm_runtime_disable(&udev->dev);
|
|
pm_runtime_set_suspended(&udev->dev);
|
|
return err;
|
|
}
|
|
|
|
|
|
/**
|
|
* usb_deauthorize_device - deauthorize a device (usbcore-internal)
|
|
* @usb_dev: USB device
|
|
*
|
|
* Move the USB device to a very basic state where interfaces are disabled
|
|
* and the device is in fact unconfigured and unusable.
|
|
*
|
|
* We share a lock (that we have) with device_del(), so we need to
|
|
* defer its call.
|
|
*/
|
|
int usb_deauthorize_device(struct usb_device *usb_dev)
|
|
{
|
|
usb_lock_device(usb_dev);
|
|
if (usb_dev->authorized == 0)
|
|
goto out_unauthorized;
|
|
|
|
usb_dev->authorized = 0;
|
|
usb_set_configuration(usb_dev, -1);
|
|
|
|
kfree(usb_dev->product);
|
|
usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
|
|
kfree(usb_dev->manufacturer);
|
|
usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
|
|
kfree(usb_dev->serial);
|
|
usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
|
|
|
|
usb_destroy_configuration(usb_dev);
|
|
usb_dev->descriptor.bNumConfigurations = 0;
|
|
|
|
out_unauthorized:
|
|
usb_unlock_device(usb_dev);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int usb_authorize_device(struct usb_device *usb_dev)
|
|
{
|
|
int result = 0, c;
|
|
|
|
usb_lock_device(usb_dev);
|
|
if (usb_dev->authorized == 1)
|
|
goto out_authorized;
|
|
|
|
result = usb_autoresume_device(usb_dev);
|
|
if (result < 0) {
|
|
dev_err(&usb_dev->dev,
|
|
"can't autoresume for authorization: %d\n", result);
|
|
goto error_autoresume;
|
|
}
|
|
result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
|
|
if (result < 0) {
|
|
dev_err(&usb_dev->dev, "can't re-read device descriptor for "
|
|
"authorization: %d\n", result);
|
|
goto error_device_descriptor;
|
|
}
|
|
|
|
kfree(usb_dev->product);
|
|
usb_dev->product = NULL;
|
|
kfree(usb_dev->manufacturer);
|
|
usb_dev->manufacturer = NULL;
|
|
kfree(usb_dev->serial);
|
|
usb_dev->serial = NULL;
|
|
|
|
usb_dev->authorized = 1;
|
|
result = usb_enumerate_device(usb_dev);
|
|
if (result < 0)
|
|
goto error_enumerate;
|
|
/* Choose and set the configuration. This registers the interfaces
|
|
* with the driver core and lets interface drivers bind to them.
|
|
*/
|
|
c = usb_choose_configuration(usb_dev);
|
|
if (c >= 0) {
|
|
result = usb_set_configuration(usb_dev, c);
|
|
if (result) {
|
|
dev_err(&usb_dev->dev,
|
|
"can't set config #%d, error %d\n", c, result);
|
|
/* This need not be fatal. The user can try to
|
|
* set other configurations. */
|
|
}
|
|
}
|
|
dev_info(&usb_dev->dev, "authorized to connect\n");
|
|
|
|
error_enumerate:
|
|
error_device_descriptor:
|
|
usb_autosuspend_device(usb_dev);
|
|
error_autoresume:
|
|
out_authorized:
|
|
usb_unlock_device(usb_dev); // complements locktree
|
|
return result;
|
|
}
|
|
|
|
|
|
/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
|
|
static unsigned hub_is_wusb(struct usb_hub *hub)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
if (hub->hdev->parent != NULL) /* not a root hub? */
|
|
return 0;
|
|
hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
|
|
return hcd->wireless;
|
|
}
|
|
|
|
|
|
#define PORT_RESET_TRIES 5
|
|
#define SET_ADDRESS_TRIES 2
|
|
#define GET_DESCRIPTOR_TRIES 2
|
|
#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
|
|
#define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first)
|
|
|
|
#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
|
|
#define HUB_SHORT_RESET_TIME 10
|
|
#define HUB_BH_RESET_TIME 50
|
|
#define HUB_LONG_RESET_TIME 200
|
|
#define HUB_RESET_TIMEOUT 500
|
|
|
|
static int hub_port_reset(struct usb_hub *hub, int port1,
|
|
struct usb_device *udev, unsigned int delay, bool warm);
|
|
|
|
/* Is a USB 3.0 port in the Inactive or Complinance Mode state?
|
|
* Port worm reset is required to recover
|
|
*/
|
|
static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus)
|
|
{
|
|
return hub_is_superspeed(hub->hdev) &&
|
|
(((portstatus & USB_PORT_STAT_LINK_STATE) ==
|
|
USB_SS_PORT_LS_SS_INACTIVE) ||
|
|
((portstatus & USB_PORT_STAT_LINK_STATE) ==
|
|
USB_SS_PORT_LS_COMP_MOD)) ;
|
|
}
|
|
|
|
static int hub_port_wait_reset(struct usb_hub *hub, int port1,
|
|
struct usb_device *udev, unsigned int delay, bool warm)
|
|
{
|
|
int delay_time, ret;
|
|
u16 portstatus;
|
|
u16 portchange;
|
|
|
|
for (delay_time = 0;
|
|
delay_time < HUB_RESET_TIMEOUT;
|
|
delay_time += delay) {
|
|
/* wait to give the device a chance to reset */
|
|
msleep(delay);
|
|
|
|
/* read and decode port status */
|
|
ret = hub_port_status(hub, port1, &portstatus, &portchange);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* Some buggy devices require a warm reset to be issued even
|
|
* when the port appears not to be connected.
|
|
*/
|
|
if (!warm) {
|
|
/*
|
|
* Some buggy devices can cause an NEC host controller
|
|
* to transition to the "Error" state after a hot port
|
|
* reset. This will show up as the port state in
|
|
* "Inactive", and the port may also report a
|
|
* disconnect. Forcing a warm port reset seems to make
|
|
* the device work.
|
|
*
|
|
* See https://bugzilla.kernel.org/show_bug.cgi?id=41752
|
|
*/
|
|
if (hub_port_warm_reset_required(hub, portstatus)) {
|
|
int ret;
|
|
|
|
if ((portchange & USB_PORT_STAT_C_CONNECTION))
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_CONNECTION);
|
|
if (portchange & USB_PORT_STAT_C_LINK_STATE)
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_PORT_LINK_STATE);
|
|
if (portchange & USB_PORT_STAT_C_RESET)
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_RESET);
|
|
dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n",
|
|
port1);
|
|
ret = hub_port_reset(hub, port1,
|
|
udev, HUB_BH_RESET_TIME,
|
|
true);
|
|
if ((portchange & USB_PORT_STAT_C_CONNECTION))
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_CONNECTION);
|
|
return ret;
|
|
}
|
|
/* Device went away? */
|
|
if (!(portstatus & USB_PORT_STAT_CONNECTION))
|
|
return -ENOTCONN;
|
|
|
|
/* bomb out completely if the connection bounced */
|
|
if ((portchange & USB_PORT_STAT_C_CONNECTION))
|
|
return -ENOTCONN;
|
|
|
|
/* if we`ve finished resetting, then break out of
|
|
* the loop
|
|
*/
|
|
if (!(portstatus & USB_PORT_STAT_RESET) &&
|
|
(portstatus & USB_PORT_STAT_ENABLE)) {
|
|
if (hub_is_wusb(hub))
|
|
udev->speed = USB_SPEED_WIRELESS;
|
|
else if (hub_is_superspeed(hub->hdev))
|
|
udev->speed = USB_SPEED_SUPER;
|
|
else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
|
|
udev->speed = USB_SPEED_HIGH;
|
|
else if (portstatus & USB_PORT_STAT_LOW_SPEED)
|
|
udev->speed = USB_SPEED_LOW;
|
|
else
|
|
udev->speed = USB_SPEED_FULL;
|
|
return 0;
|
|
}
|
|
} else {
|
|
if (portchange & USB_PORT_STAT_C_BH_RESET)
|
|
return 0;
|
|
}
|
|
|
|
/* switch to the long delay after two short delay failures */
|
|
if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
|
|
delay = HUB_LONG_RESET_TIME;
|
|
|
|
dev_dbg (hub->intfdev,
|
|
"port %d not %sreset yet, waiting %dms\n",
|
|
port1, warm ? "warm " : "", delay);
|
|
}
|
|
|
|
return -EBUSY;
|
|
}
|
|
|
|
static void hub_port_finish_reset(struct usb_hub *hub, int port1,
|
|
struct usb_device *udev, int *status, bool warm)
|
|
{
|
|
switch (*status) {
|
|
case 0:
|
|
if (!warm) {
|
|
struct usb_hcd *hcd;
|
|
/* TRSTRCY = 10 ms; plus some extra */
|
|
msleep(10 + 40);
|
|
update_devnum(udev, 0);
|
|
hcd = bus_to_hcd(udev->bus);
|
|
if (hcd->driver->reset_device) {
|
|
*status = hcd->driver->reset_device(hcd, udev);
|
|
if (*status < 0) {
|
|
dev_err(&udev->dev, "Cannot reset "
|
|
"HCD device state\n");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
/* FALL THROUGH */
|
|
case -ENOTCONN:
|
|
case -ENODEV:
|
|
clear_port_feature(hub->hdev,
|
|
port1, USB_PORT_FEAT_C_RESET);
|
|
/* FIXME need disconnect() for NOTATTACHED device */
|
|
if (warm) {
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_BH_PORT_RESET);
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_PORT_LINK_STATE);
|
|
} else {
|
|
usb_set_device_state(udev, *status
|
|
? USB_STATE_NOTATTACHED
|
|
: USB_STATE_DEFAULT);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */
|
|
static int hub_port_reset(struct usb_hub *hub, int port1,
|
|
struct usb_device *udev, unsigned int delay, bool warm)
|
|
{
|
|
int i, status;
|
|
|
|
if (!warm) {
|
|
/* Block EHCI CF initialization during the port reset.
|
|
* Some companion controllers don't like it when they mix.
|
|
*/
|
|
down_read(&ehci_cf_port_reset_rwsem);
|
|
} else {
|
|
if (!hub_is_superspeed(hub->hdev)) {
|
|
dev_err(hub->intfdev, "only USB3 hub support "
|
|
"warm reset\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/* Reset the port */
|
|
for (i = 0; i < PORT_RESET_TRIES; i++) {
|
|
status = set_port_feature(hub->hdev, port1, (warm ?
|
|
USB_PORT_FEAT_BH_PORT_RESET :
|
|
USB_PORT_FEAT_RESET));
|
|
if (status) {
|
|
dev_err(hub->intfdev,
|
|
"cannot %sreset port %d (err = %d)\n",
|
|
warm ? "warm " : "", port1, status);
|
|
} else {
|
|
status = hub_port_wait_reset(hub, port1, udev, delay,
|
|
warm);
|
|
if (status && status != -ENOTCONN)
|
|
dev_dbg(hub->intfdev,
|
|
"port_wait_reset: err = %d\n",
|
|
status);
|
|
}
|
|
|
|
/* return on disconnect or reset */
|
|
if (status == 0 || status == -ENOTCONN || status == -ENODEV) {
|
|
hub_port_finish_reset(hub, port1, udev, &status, warm);
|
|
goto done;
|
|
}
|
|
|
|
dev_dbg (hub->intfdev,
|
|
"port %d not enabled, trying %sreset again...\n",
|
|
port1, warm ? "warm " : "");
|
|
delay = HUB_LONG_RESET_TIME;
|
|
}
|
|
|
|
dev_err (hub->intfdev,
|
|
"Cannot enable port %i. Maybe the USB cable is bad?\n",
|
|
port1);
|
|
|
|
done:
|
|
if (!warm)
|
|
up_read(&ehci_cf_port_reset_rwsem);
|
|
|
|
return status;
|
|
}
|
|
|
|
/* Check if a port is power on */
|
|
static int port_is_power_on(struct usb_hub *hub, unsigned portstatus)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (hub_is_superspeed(hub->hdev)) {
|
|
if (portstatus & USB_SS_PORT_STAT_POWER)
|
|
ret = 1;
|
|
} else {
|
|
if (portstatus & USB_PORT_STAT_POWER)
|
|
ret = 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int usb_get_hub_port_power_state(struct usb_device *hdev, int port1)
|
|
{
|
|
struct usb_hub *hub = hdev_to_hub(hdev);
|
|
struct usb_port_status data;
|
|
u16 portstatus;
|
|
int ret;
|
|
|
|
ret = get_port_status(hub->hdev, port1, &data);
|
|
if (ret < 4) {
|
|
dev_err(hub->intfdev,
|
|
"%s failed (err = %d)\n", __func__, ret);
|
|
if (ret >= 0)
|
|
ret = -EIO;
|
|
return ret;
|
|
} else
|
|
portstatus = le16_to_cpu(data.wPortStatus);
|
|
return port_is_power_on(hub, portstatus);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
/* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */
|
|
static int port_is_suspended(struct usb_hub *hub, unsigned portstatus)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (hub_is_superspeed(hub->hdev)) {
|
|
if ((portstatus & USB_PORT_STAT_LINK_STATE)
|
|
== USB_SS_PORT_LS_U3)
|
|
ret = 1;
|
|
} else {
|
|
if (portstatus & USB_PORT_STAT_SUSPEND)
|
|
ret = 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Determine whether the device on a port is ready for a normal resume,
|
|
* is ready for a reset-resume, or should be disconnected.
|
|
*/
|
|
static int check_port_resume_type(struct usb_device *udev,
|
|
struct usb_hub *hub, int port1,
|
|
int status, unsigned portchange, unsigned portstatus)
|
|
{
|
|
/* Is the device still present? */
|
|
if (status || port_is_suspended(hub, portstatus) ||
|
|
!port_is_power_on(hub, portstatus) ||
|
|
!(portstatus & USB_PORT_STAT_CONNECTION)) {
|
|
if (status >= 0)
|
|
status = -ENODEV;
|
|
}
|
|
|
|
/* Can't do a normal resume if the port isn't enabled,
|
|
* so try a reset-resume instead.
|
|
*/
|
|
else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) {
|
|
if (udev->persist_enabled)
|
|
udev->reset_resume = 1;
|
|
else
|
|
status = -ENODEV;
|
|
}
|
|
|
|
if (status) {
|
|
dev_dbg(hub->intfdev,
|
|
"port %d status %04x.%04x after resume, %d\n",
|
|
port1, portchange, portstatus, status);
|
|
} else if (udev->reset_resume) {
|
|
|
|
/* Late port handoff can set status-change bits */
|
|
if (portchange & USB_PORT_STAT_C_CONNECTION)
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_CONNECTION);
|
|
if (portchange & USB_PORT_STAT_C_ENABLE)
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_ENABLE);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
int usb_disable_ltm(struct usb_device *udev)
|
|
{
|
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
|
|
|
|
/* Check if the roothub and device supports LTM. */
|
|
if (!usb_device_supports_ltm(hcd->self.root_hub) ||
|
|
!usb_device_supports_ltm(udev))
|
|
return 0;
|
|
|
|
/* Clear Feature LTM Enable can only be sent if the device is
|
|
* configured.
|
|
*/
|
|
if (!udev->actconfig)
|
|
return 0;
|
|
|
|
return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
|
|
USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
|
|
USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
|
|
USB_CTRL_SET_TIMEOUT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_disable_ltm);
|
|
|
|
void usb_enable_ltm(struct usb_device *udev)
|
|
{
|
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
|
|
|
|
/* Check if the roothub and device supports LTM. */
|
|
if (!usb_device_supports_ltm(hcd->self.root_hub) ||
|
|
!usb_device_supports_ltm(udev))
|
|
return;
|
|
|
|
/* Set Feature LTM Enable can only be sent if the device is
|
|
* configured.
|
|
*/
|
|
if (!udev->actconfig)
|
|
return;
|
|
|
|
usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
|
|
USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
|
|
USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
|
|
USB_CTRL_SET_TIMEOUT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_enable_ltm);
|
|
|
|
#ifdef CONFIG_USB_SUSPEND
|
|
|
|
/*
|
|
* usb_port_suspend - suspend a usb device's upstream port
|
|
* @udev: device that's no longer in active use, not a root hub
|
|
* Context: must be able to sleep; device not locked; pm locks held
|
|
*
|
|
* Suspends a USB device that isn't in active use, conserving power.
|
|
* Devices may wake out of a suspend, if anything important happens,
|
|
* using the remote wakeup mechanism. They may also be taken out of
|
|
* suspend by the host, using usb_port_resume(). It's also routine
|
|
* to disconnect devices while they are suspended.
|
|
*
|
|
* This only affects the USB hardware for a device; its interfaces
|
|
* (and, for hubs, child devices) must already have been suspended.
|
|
*
|
|
* Selective port suspend reduces power; most suspended devices draw
|
|
* less than 500 uA. It's also used in OTG, along with remote wakeup.
|
|
* All devices below the suspended port are also suspended.
|
|
*
|
|
* Devices leave suspend state when the host wakes them up. Some devices
|
|
* also support "remote wakeup", where the device can activate the USB
|
|
* tree above them to deliver data, such as a keypress or packet. In
|
|
* some cases, this wakes the USB host.
|
|
*
|
|
* Suspending OTG devices may trigger HNP, if that's been enabled
|
|
* between a pair of dual-role devices. That will change roles, such
|
|
* as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
|
|
*
|
|
* Devices on USB hub ports have only one "suspend" state, corresponding
|
|
* to ACPI D2, "may cause the device to lose some context".
|
|
* State transitions include:
|
|
*
|
|
* - suspend, resume ... when the VBUS power link stays live
|
|
* - suspend, disconnect ... VBUS lost
|
|
*
|
|
* Once VBUS drop breaks the circuit, the port it's using has to go through
|
|
* normal re-enumeration procedures, starting with enabling VBUS power.
|
|
* Other than re-initializing the hub (plug/unplug, except for root hubs),
|
|
* Linux (2.6) currently has NO mechanisms to initiate that: no khubd
|
|
* timer, no SRP, no requests through sysfs.
|
|
*
|
|
* If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
|
|
* the root hub for their bus goes into global suspend ... so we don't
|
|
* (falsely) update the device power state to say it suspended.
|
|
*
|
|
* Returns 0 on success, else negative errno.
|
|
*/
|
|
int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
|
|
{
|
|
struct usb_hub *hub = hdev_to_hub(udev->parent);
|
|
int port1 = udev->portnum;
|
|
int status;
|
|
|
|
/* enable remote wakeup when appropriate; this lets the device
|
|
* wake up the upstream hub (including maybe the root hub).
|
|
*
|
|
* NOTE: OTG devices may issue remote wakeup (or SRP) even when
|
|
* we don't explicitly enable it here.
|
|
*/
|
|
if (udev->do_remote_wakeup) {
|
|
if (!hub_is_superspeed(hub->hdev)) {
|
|
status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
|
|
USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
|
|
USB_DEVICE_REMOTE_WAKEUP, 0,
|
|
NULL, 0,
|
|
USB_CTRL_SET_TIMEOUT);
|
|
} else {
|
|
/* Assume there's only one function on the USB 3.0
|
|
* device and enable remote wake for the first
|
|
* interface. FIXME if the interface association
|
|
* descriptor shows there's more than one function.
|
|
*/
|
|
status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
|
|
USB_REQ_SET_FEATURE,
|
|
USB_RECIP_INTERFACE,
|
|
USB_INTRF_FUNC_SUSPEND,
|
|
USB_INTRF_FUNC_SUSPEND_RW |
|
|
USB_INTRF_FUNC_SUSPEND_LP,
|
|
NULL, 0,
|
|
USB_CTRL_SET_TIMEOUT);
|
|
}
|
|
if (status) {
|
|
dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
|
|
status);
|
|
/* bail if autosuspend is requested */
|
|
if (PMSG_IS_AUTO(msg))
|
|
return status;
|
|
}
|
|
}
|
|
|
|
/* disable USB2 hardware LPM */
|
|
if (udev->usb2_hw_lpm_enabled == 1)
|
|
usb_set_usb2_hardware_lpm(udev, 0);
|
|
|
|
if (usb_disable_ltm(udev)) {
|
|
dev_err(&udev->dev, "%s Failed to disable LTM before suspend\n.",
|
|
__func__);
|
|
return -ENOMEM;
|
|
}
|
|
if (usb_unlocked_disable_lpm(udev)) {
|
|
dev_err(&udev->dev, "%s Failed to disable LPM before suspend\n.",
|
|
__func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* see 7.1.7.6 */
|
|
if (hub_is_superspeed(hub->hdev))
|
|
status = set_port_feature(hub->hdev,
|
|
port1 | (USB_SS_PORT_LS_U3 << 3),
|
|
USB_PORT_FEAT_LINK_STATE);
|
|
else
|
|
status = set_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_SUSPEND);
|
|
if (status) {
|
|
dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
|
|
port1, status);
|
|
/* paranoia: "should not happen" */
|
|
if (udev->do_remote_wakeup)
|
|
(void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
|
|
USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
|
|
USB_DEVICE_REMOTE_WAKEUP, 0,
|
|
NULL, 0,
|
|
USB_CTRL_SET_TIMEOUT);
|
|
|
|
/* Try to enable USB2 hardware LPM again */
|
|
if (udev->usb2_hw_lpm_capable == 1)
|
|
usb_set_usb2_hardware_lpm(udev, 1);
|
|
|
|
/* Try to enable USB3 LTM and LPM again */
|
|
usb_enable_ltm(udev);
|
|
usb_unlocked_enable_lpm(udev);
|
|
|
|
/* System sleep transitions should never fail */
|
|
if (!PMSG_IS_AUTO(msg))
|
|
status = 0;
|
|
} else {
|
|
/* device has up to 10 msec to fully suspend */
|
|
dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n",
|
|
(PMSG_IS_AUTO(msg) ? "auto-" : ""),
|
|
udev->do_remote_wakeup);
|
|
usb_set_device_state(udev, USB_STATE_SUSPENDED);
|
|
msleep(10);
|
|
}
|
|
usb_mark_last_busy(hub->hdev);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* If the USB "suspend" state is in use (rather than "global suspend"),
|
|
* many devices will be individually taken out of suspend state using
|
|
* special "resume" signaling. This routine kicks in shortly after
|
|
* hardware resume signaling is finished, either because of selective
|
|
* resume (by host) or remote wakeup (by device) ... now see what changed
|
|
* in the tree that's rooted at this device.
|
|
*
|
|
* If @udev->reset_resume is set then the device is reset before the
|
|
* status check is done.
|
|
*/
|
|
static int finish_port_resume(struct usb_device *udev)
|
|
{
|
|
int status = 0;
|
|
u16 devstatus;
|
|
|
|
/* caller owns the udev device lock */
|
|
dev_dbg(&udev->dev, "%s\n",
|
|
udev->reset_resume ? "finish reset-resume" : "finish resume");
|
|
|
|
/* usb ch9 identifies four variants of SUSPENDED, based on what
|
|
* state the device resumes to. Linux currently won't see the
|
|
* first two on the host side; they'd be inside hub_port_init()
|
|
* during many timeouts, but khubd can't suspend until later.
|
|
*/
|
|
usb_set_device_state(udev, udev->actconfig
|
|
? USB_STATE_CONFIGURED
|
|
: USB_STATE_ADDRESS);
|
|
|
|
/* 10.5.4.5 says not to reset a suspended port if the attached
|
|
* device is enabled for remote wakeup. Hence the reset
|
|
* operation is carried out here, after the port has been
|
|
* resumed.
|
|
*/
|
|
if (udev->reset_resume)
|
|
retry_reset_resume:
|
|
status = usb_reset_and_verify_device(udev);
|
|
|
|
/* 10.5.4.5 says be sure devices in the tree are still there.
|
|
* For now let's assume the device didn't go crazy on resume,
|
|
* and device drivers will know about any resume quirks.
|
|
*/
|
|
if (status == 0) {
|
|
devstatus = 0;
|
|
status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
|
|
if (status >= 0)
|
|
status = (status > 0 ? 0 : -ENODEV);
|
|
|
|
/* If a normal resume failed, try doing a reset-resume */
|
|
if (status && !udev->reset_resume && udev->persist_enabled) {
|
|
dev_dbg(&udev->dev, "retry with reset-resume\n");
|
|
udev->reset_resume = 1;
|
|
goto retry_reset_resume;
|
|
}
|
|
}
|
|
|
|
if (status) {
|
|
dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
|
|
status);
|
|
} else if (udev->actconfig) {
|
|
le16_to_cpus(&devstatus);
|
|
if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
|
|
status = usb_control_msg(udev,
|
|
usb_sndctrlpipe(udev, 0),
|
|
USB_REQ_CLEAR_FEATURE,
|
|
USB_RECIP_DEVICE,
|
|
USB_DEVICE_REMOTE_WAKEUP, 0,
|
|
NULL, 0,
|
|
USB_CTRL_SET_TIMEOUT);
|
|
if (status)
|
|
dev_dbg(&udev->dev,
|
|
"disable remote wakeup, status %d\n",
|
|
status);
|
|
}
|
|
status = 0;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* usb_port_resume - re-activate a suspended usb device's upstream port
|
|
* @udev: device to re-activate, not a root hub
|
|
* Context: must be able to sleep; device not locked; pm locks held
|
|
*
|
|
* This will re-activate the suspended device, increasing power usage
|
|
* while letting drivers communicate again with its endpoints.
|
|
* USB resume explicitly guarantees that the power session between
|
|
* the host and the device is the same as it was when the device
|
|
* suspended.
|
|
*
|
|
* If @udev->reset_resume is set then this routine won't check that the
|
|
* port is still enabled. Furthermore, finish_port_resume() above will
|
|
* reset @udev. The end result is that a broken power session can be
|
|
* recovered and @udev will appear to persist across a loss of VBUS power.
|
|
*
|
|
* For example, if a host controller doesn't maintain VBUS suspend current
|
|
* during a system sleep or is reset when the system wakes up, all the USB
|
|
* power sessions below it will be broken. This is especially troublesome
|
|
* for mass-storage devices containing mounted filesystems, since the
|
|
* device will appear to have disconnected and all the memory mappings
|
|
* to it will be lost. Using the USB_PERSIST facility, the device can be
|
|
* made to appear as if it had not disconnected.
|
|
*
|
|
* This facility can be dangerous. Although usb_reset_and_verify_device() makes
|
|
* every effort to insure that the same device is present after the
|
|
* reset as before, it cannot provide a 100% guarantee. Furthermore it's
|
|
* quite possible for a device to remain unaltered but its media to be
|
|
* changed. If the user replaces a flash memory card while the system is
|
|
* asleep, he will have only himself to blame when the filesystem on the
|
|
* new card is corrupted and the system crashes.
|
|
*
|
|
* Returns 0 on success, else negative errno.
|
|
*/
|
|
int usb_port_resume(struct usb_device *udev, pm_message_t msg)
|
|
{
|
|
struct usb_hub *hub = hdev_to_hub(udev->parent);
|
|
int port1 = udev->portnum;
|
|
int status;
|
|
u16 portchange, portstatus;
|
|
|
|
/* Skip the initial Clear-Suspend step for a remote wakeup */
|
|
status = hub_port_status(hub, port1, &portstatus, &portchange);
|
|
if (status == 0 && !port_is_suspended(hub, portstatus))
|
|
goto SuspendCleared;
|
|
|
|
// dev_dbg(hub->intfdev, "resume port %d\n", port1);
|
|
|
|
set_bit(port1, hub->busy_bits);
|
|
|
|
/* see 7.1.7.7; affects power usage, but not budgeting */
|
|
if (hub_is_superspeed(hub->hdev))
|
|
status = set_port_feature(hub->hdev,
|
|
port1 | (USB_SS_PORT_LS_U0 << 3),
|
|
USB_PORT_FEAT_LINK_STATE);
|
|
else
|
|
status = clear_port_feature(hub->hdev,
|
|
port1, USB_PORT_FEAT_SUSPEND);
|
|
if (status) {
|
|
dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
|
|
port1, status);
|
|
} else {
|
|
/* drive resume for at least 20 msec */
|
|
dev_dbg(&udev->dev, "usb %sresume\n",
|
|
(PMSG_IS_AUTO(msg) ? "auto-" : ""));
|
|
msleep(25);
|
|
|
|
/* Virtual root hubs can trigger on GET_PORT_STATUS to
|
|
* stop resume signaling. Then finish the resume
|
|
* sequence.
|
|
*/
|
|
status = hub_port_status(hub, port1, &portstatus, &portchange);
|
|
|
|
/* TRSMRCY = 10 msec */
|
|
msleep(10);
|
|
}
|
|
|
|
SuspendCleared:
|
|
if (status == 0) {
|
|
if (hub_is_superspeed(hub->hdev)) {
|
|
if (portchange & USB_PORT_STAT_C_LINK_STATE)
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_PORT_LINK_STATE);
|
|
} else {
|
|
if (portchange & USB_PORT_STAT_C_SUSPEND)
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_SUSPEND);
|
|
}
|
|
}
|
|
|
|
clear_bit(port1, hub->busy_bits);
|
|
|
|
status = check_port_resume_type(udev,
|
|
hub, port1, status, portchange, portstatus);
|
|
if (status == 0)
|
|
status = finish_port_resume(udev);
|
|
if (status < 0) {
|
|
dev_dbg(&udev->dev, "can't resume, status %d\n", status);
|
|
hub_port_logical_disconnect(hub, port1);
|
|
} else {
|
|
/* Try to enable USB2 hardware LPM */
|
|
if (udev->usb2_hw_lpm_capable == 1)
|
|
usb_set_usb2_hardware_lpm(udev, 1);
|
|
|
|
/* Try to enable USB3 LTM and LPM */
|
|
usb_enable_ltm(udev);
|
|
usb_unlocked_enable_lpm(udev);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/* caller has locked udev */
|
|
int usb_remote_wakeup(struct usb_device *udev)
|
|
{
|
|
int status = 0;
|
|
|
|
if (udev->state == USB_STATE_SUSPENDED) {
|
|
dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
|
|
status = usb_autoresume_device(udev);
|
|
if (status == 0) {
|
|
/* Let the drivers do their thing, then... */
|
|
usb_autosuspend_device(udev);
|
|
}
|
|
}
|
|
return status;
|
|
}
|
|
|
|
#else /* CONFIG_USB_SUSPEND */
|
|
|
|
/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
|
|
|
|
int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* However we may need to do a reset-resume */
|
|
|
|
int usb_port_resume(struct usb_device *udev, pm_message_t msg)
|
|
{
|
|
struct usb_hub *hub = hdev_to_hub(udev->parent);
|
|
int port1 = udev->portnum;
|
|
int status;
|
|
u16 portchange, portstatus;
|
|
|
|
status = hub_port_status(hub, port1, &portstatus, &portchange);
|
|
status = check_port_resume_type(udev,
|
|
hub, port1, status, portchange, portstatus);
|
|
|
|
if (status) {
|
|
dev_dbg(&udev->dev, "can't resume, status %d\n", status);
|
|
hub_port_logical_disconnect(hub, port1);
|
|
} else if (udev->reset_resume) {
|
|
dev_dbg(&udev->dev, "reset-resume\n");
|
|
status = usb_reset_and_verify_device(udev);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
#endif
|
|
|
|
static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
|
|
{
|
|
struct usb_hub *hub = usb_get_intfdata (intf);
|
|
struct usb_device *hdev = hub->hdev;
|
|
unsigned port1;
|
|
int status;
|
|
|
|
/* Warn if children aren't already suspended */
|
|
for (port1 = 1; port1 <= hdev->maxchild; port1++) {
|
|
struct usb_device *udev;
|
|
|
|
udev = hub->ports[port1 - 1]->child;
|
|
if (udev && udev->can_submit) {
|
|
dev_warn(&intf->dev, "port %d nyet suspended\n", port1);
|
|
if (PMSG_IS_AUTO(msg))
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) {
|
|
/* Enable hub to send remote wakeup for all ports. */
|
|
for (port1 = 1; port1 <= hdev->maxchild; port1++) {
|
|
status = set_port_feature(hdev,
|
|
port1 |
|
|
USB_PORT_FEAT_REMOTE_WAKE_CONNECT |
|
|
USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT |
|
|
USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT,
|
|
USB_PORT_FEAT_REMOTE_WAKE_MASK);
|
|
}
|
|
}
|
|
|
|
dev_dbg(&intf->dev, "%s\n", __func__);
|
|
|
|
/* stop khubd and related activity */
|
|
hub_quiesce(hub, HUB_SUSPEND);
|
|
return 0;
|
|
}
|
|
|
|
static int hub_resume(struct usb_interface *intf)
|
|
{
|
|
struct usb_hub *hub = usb_get_intfdata(intf);
|
|
|
|
dev_dbg(&intf->dev, "%s\n", __func__);
|
|
hub_activate(hub, HUB_RESUME);
|
|
return 0;
|
|
}
|
|
|
|
static int hub_reset_resume(struct usb_interface *intf)
|
|
{
|
|
struct usb_hub *hub = usb_get_intfdata(intf);
|
|
|
|
dev_dbg(&intf->dev, "%s\n", __func__);
|
|
hub_activate(hub, HUB_RESET_RESUME);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
|
|
* @rhdev: struct usb_device for the root hub
|
|
*
|
|
* The USB host controller driver calls this function when its root hub
|
|
* is resumed and Vbus power has been interrupted or the controller
|
|
* has been reset. The routine marks @rhdev as having lost power.
|
|
* When the hub driver is resumed it will take notice and carry out
|
|
* power-session recovery for all the "USB-PERSIST"-enabled child devices;
|
|
* the others will be disconnected.
|
|
*/
|
|
void usb_root_hub_lost_power(struct usb_device *rhdev)
|
|
{
|
|
dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
|
|
rhdev->reset_resume = 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
|
|
|
|
static const char * const usb3_lpm_names[] = {
|
|
"U0",
|
|
"U1",
|
|
"U2",
|
|
"U3",
|
|
};
|
|
|
|
/*
|
|
* Send a Set SEL control transfer to the device, prior to enabling
|
|
* device-initiated U1 or U2. This lets the device know the exit latencies from
|
|
* the time the device initiates a U1 or U2 exit, to the time it will receive a
|
|
* packet from the host.
|
|
*
|
|
* This function will fail if the SEL or PEL values for udev are greater than
|
|
* the maximum allowed values for the link state to be enabled.
|
|
*/
|
|
static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state)
|
|
{
|
|
struct usb_set_sel_req *sel_values;
|
|
unsigned long long u1_sel;
|
|
unsigned long long u1_pel;
|
|
unsigned long long u2_sel;
|
|
unsigned long long u2_pel;
|
|
int ret;
|
|
|
|
/* Convert SEL and PEL stored in ns to us */
|
|
u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000);
|
|
u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000);
|
|
u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000);
|
|
u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000);
|
|
|
|
/*
|
|
* Make sure that the calculated SEL and PEL values for the link
|
|
* state we're enabling aren't bigger than the max SEL/PEL
|
|
* value that will fit in the SET SEL control transfer.
|
|
* Otherwise the device would get an incorrect idea of the exit
|
|
* latency for the link state, and could start a device-initiated
|
|
* U1/U2 when the exit latencies are too high.
|
|
*/
|
|
if ((state == USB3_LPM_U1 &&
|
|
(u1_sel > USB3_LPM_MAX_U1_SEL_PEL ||
|
|
u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) ||
|
|
(state == USB3_LPM_U2 &&
|
|
(u2_sel > USB3_LPM_MAX_U2_SEL_PEL ||
|
|
u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) {
|
|
dev_dbg(&udev->dev, "Device-initiated %s disabled due "
|
|
"to long SEL %llu ms or PEL %llu ms\n",
|
|
usb3_lpm_names[state], u1_sel, u1_pel);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* If we're enabling device-initiated LPM for one link state,
|
|
* but the other link state has a too high SEL or PEL value,
|
|
* just set those values to the max in the Set SEL request.
|
|
*/
|
|
if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL)
|
|
u1_sel = USB3_LPM_MAX_U1_SEL_PEL;
|
|
|
|
if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL)
|
|
u1_pel = USB3_LPM_MAX_U1_SEL_PEL;
|
|
|
|
if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL)
|
|
u2_sel = USB3_LPM_MAX_U2_SEL_PEL;
|
|
|
|
if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL)
|
|
u2_pel = USB3_LPM_MAX_U2_SEL_PEL;
|
|
|
|
/*
|
|
* usb_enable_lpm() can be called as part of a failed device reset,
|
|
* which may be initiated by an error path of a mass storage driver.
|
|
* Therefore, use GFP_NOIO.
|
|
*/
|
|
sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO);
|
|
if (!sel_values)
|
|
return -ENOMEM;
|
|
|
|
sel_values->u1_sel = u1_sel;
|
|
sel_values->u1_pel = u1_pel;
|
|
sel_values->u2_sel = cpu_to_le16(u2_sel);
|
|
sel_values->u2_pel = cpu_to_le16(u2_pel);
|
|
|
|
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
|
|
USB_REQ_SET_SEL,
|
|
USB_RECIP_DEVICE,
|
|
0, 0,
|
|
sel_values, sizeof *(sel_values),
|
|
USB_CTRL_SET_TIMEOUT);
|
|
kfree(sel_values);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Enable or disable device-initiated U1 or U2 transitions.
|
|
*/
|
|
static int usb_set_device_initiated_lpm(struct usb_device *udev,
|
|
enum usb3_link_state state, bool enable)
|
|
{
|
|
int ret;
|
|
int feature;
|
|
|
|
switch (state) {
|
|
case USB3_LPM_U1:
|
|
feature = USB_DEVICE_U1_ENABLE;
|
|
break;
|
|
case USB3_LPM_U2:
|
|
feature = USB_DEVICE_U2_ENABLE;
|
|
break;
|
|
default:
|
|
dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n",
|
|
__func__, enable ? "enable" : "disable");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (udev->state != USB_STATE_CONFIGURED) {
|
|
dev_dbg(&udev->dev, "%s: Can't %s %s state "
|
|
"for unconfigured device.\n",
|
|
__func__, enable ? "enable" : "disable",
|
|
usb3_lpm_names[state]);
|
|
return 0;
|
|
}
|
|
|
|
if (enable) {
|
|
/*
|
|
* First, let the device know about the exit latencies
|
|
* associated with the link state we're about to enable.
|
|
*/
|
|
ret = usb_req_set_sel(udev, state);
|
|
if (ret < 0) {
|
|
dev_warn(&udev->dev, "Set SEL for device-initiated "
|
|
"%s failed.\n", usb3_lpm_names[state]);
|
|
return -EBUSY;
|
|
}
|
|
/*
|
|
* Now send the control transfer to enable device-initiated LPM
|
|
* for either U1 or U2.
|
|
*/
|
|
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
|
|
USB_REQ_SET_FEATURE,
|
|
USB_RECIP_DEVICE,
|
|
feature,
|
|
0, NULL, 0,
|
|
USB_CTRL_SET_TIMEOUT);
|
|
} else {
|
|
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
|
|
USB_REQ_CLEAR_FEATURE,
|
|
USB_RECIP_DEVICE,
|
|
feature,
|
|
0, NULL, 0,
|
|
USB_CTRL_SET_TIMEOUT);
|
|
}
|
|
if (ret < 0) {
|
|
dev_warn(&udev->dev, "%s of device-initiated %s failed.\n",
|
|
enable ? "Enable" : "Disable",
|
|
usb3_lpm_names[state]);
|
|
return -EBUSY;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int usb_set_lpm_timeout(struct usb_device *udev,
|
|
enum usb3_link_state state, int timeout)
|
|
{
|
|
int ret;
|
|
int feature;
|
|
|
|
switch (state) {
|
|
case USB3_LPM_U1:
|
|
feature = USB_PORT_FEAT_U1_TIMEOUT;
|
|
break;
|
|
case USB3_LPM_U2:
|
|
feature = USB_PORT_FEAT_U2_TIMEOUT;
|
|
break;
|
|
default:
|
|
dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT &&
|
|
timeout != USB3_LPM_DEVICE_INITIATED) {
|
|
dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, "
|
|
"which is a reserved value.\n",
|
|
usb3_lpm_names[state], timeout);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = set_port_feature(udev->parent,
|
|
USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum,
|
|
feature);
|
|
if (ret < 0) {
|
|
dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x,"
|
|
"error code %i\n", usb3_lpm_names[state],
|
|
timeout, ret);
|
|
return -EBUSY;
|
|
}
|
|
if (state == USB3_LPM_U1)
|
|
udev->u1_params.timeout = timeout;
|
|
else
|
|
udev->u2_params.timeout = timeout;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated
|
|
* U1/U2 entry.
|
|
*
|
|
* We will attempt to enable U1 or U2, but there are no guarantees that the
|
|
* control transfers to set the hub timeout or enable device-initiated U1/U2
|
|
* will be successful.
|
|
*
|
|
* If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI
|
|
* driver know about it. If that call fails, it should be harmless, and just
|
|
* take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency.
|
|
*/
|
|
static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
|
|
enum usb3_link_state state)
|
|
{
|
|
int timeout;
|
|
|
|
/* We allow the host controller to set the U1/U2 timeout internally
|
|
* first, so that it can change its schedule to account for the
|
|
* additional latency to send data to a device in a lower power
|
|
* link state.
|
|
*/
|
|
timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state);
|
|
|
|
/* xHCI host controller doesn't want to enable this LPM state. */
|
|
if (timeout == 0)
|
|
return;
|
|
|
|
if (timeout < 0) {
|
|
dev_warn(&udev->dev, "Could not enable %s link state, "
|
|
"xHCI error %i.\n", usb3_lpm_names[state],
|
|
timeout);
|
|
return;
|
|
}
|
|
|
|
if (usb_set_lpm_timeout(udev, state, timeout))
|
|
/* If we can't set the parent hub U1/U2 timeout,
|
|
* device-initiated LPM won't be allowed either, so let the xHCI
|
|
* host know that this link state won't be enabled.
|
|
*/
|
|
hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state);
|
|
|
|
/* Only a configured device will accept the Set Feature U1/U2_ENABLE */
|
|
else if (udev->actconfig)
|
|
usb_set_device_initiated_lpm(udev, state, true);
|
|
|
|
}
|
|
|
|
/*
|
|
* Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated
|
|
* U1/U2 entry.
|
|
*
|
|
* If this function returns -EBUSY, the parent hub will still allow U1/U2 entry.
|
|
* If zero is returned, the parent will not allow the link to go into U1/U2.
|
|
*
|
|
* If zero is returned, device-initiated U1/U2 entry may still be enabled, but
|
|
* it won't have an effect on the bus link state because the parent hub will
|
|
* still disallow device-initiated U1/U2 entry.
|
|
*
|
|
* If zero is returned, the xHCI host controller may still think U1/U2 entry is
|
|
* possible. The result will be slightly more bus bandwidth will be taken up
|
|
* (to account for U1/U2 exit latency), but it should be harmless.
|
|
*/
|
|
static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
|
|
enum usb3_link_state state)
|
|
{
|
|
int feature;
|
|
|
|
switch (state) {
|
|
case USB3_LPM_U1:
|
|
feature = USB_PORT_FEAT_U1_TIMEOUT;
|
|
break;
|
|
case USB3_LPM_U2:
|
|
feature = USB_PORT_FEAT_U2_TIMEOUT;
|
|
break;
|
|
default:
|
|
dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (usb_set_lpm_timeout(udev, state, 0))
|
|
return -EBUSY;
|
|
|
|
usb_set_device_initiated_lpm(udev, state, false);
|
|
|
|
if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state))
|
|
dev_warn(&udev->dev, "Could not disable xHCI %s timeout, "
|
|
"bus schedule bandwidth may be impacted.\n",
|
|
usb3_lpm_names[state]);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Disable hub-initiated and device-initiated U1 and U2 entry.
|
|
* Caller must own the bandwidth_mutex.
|
|
*
|
|
* This will call usb_enable_lpm() on failure, which will decrement
|
|
* lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero.
|
|
*/
|
|
int usb_disable_lpm(struct usb_device *udev)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
|
|
if (!udev || !udev->parent ||
|
|
udev->speed != USB_SPEED_SUPER ||
|
|
!udev->lpm_capable)
|
|
return 0;
|
|
|
|
hcd = bus_to_hcd(udev->bus);
|
|
if (!hcd || !hcd->driver->disable_usb3_lpm_timeout)
|
|
return 0;
|
|
|
|
udev->lpm_disable_count++;
|
|
if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0))
|
|
return 0;
|
|
|
|
/* If LPM is enabled, attempt to disable it. */
|
|
if (usb_disable_link_state(hcd, udev, USB3_LPM_U1))
|
|
goto enable_lpm;
|
|
if (usb_disable_link_state(hcd, udev, USB3_LPM_U2))
|
|
goto enable_lpm;
|
|
|
|
return 0;
|
|
|
|
enable_lpm:
|
|
usb_enable_lpm(udev);
|
|
return -EBUSY;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_disable_lpm);
|
|
|
|
/* Grab the bandwidth_mutex before calling usb_disable_lpm() */
|
|
int usb_unlocked_disable_lpm(struct usb_device *udev)
|
|
{
|
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
|
|
int ret;
|
|
|
|
if (!hcd)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(hcd->bandwidth_mutex);
|
|
ret = usb_disable_lpm(udev);
|
|
mutex_unlock(hcd->bandwidth_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);
|
|
|
|
/*
|
|
* Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The
|
|
* xHCI host policy may prevent U1 or U2 from being enabled.
|
|
*
|
|
* Other callers may have disabled link PM, so U1 and U2 entry will be disabled
|
|
* until the lpm_disable_count drops to zero. Caller must own the
|
|
* bandwidth_mutex.
|
|
*/
|
|
void usb_enable_lpm(struct usb_device *udev)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
|
|
if (!udev || !udev->parent ||
|
|
udev->speed != USB_SPEED_SUPER ||
|
|
!udev->lpm_capable)
|
|
return;
|
|
|
|
udev->lpm_disable_count--;
|
|
hcd = bus_to_hcd(udev->bus);
|
|
/* Double check that we can both enable and disable LPM.
|
|
* Device must be configured to accept set feature U1/U2 timeout.
|
|
*/
|
|
if (!hcd || !hcd->driver->enable_usb3_lpm_timeout ||
|
|
!hcd->driver->disable_usb3_lpm_timeout)
|
|
return;
|
|
|
|
if (udev->lpm_disable_count > 0)
|
|
return;
|
|
|
|
usb_enable_link_state(hcd, udev, USB3_LPM_U1);
|
|
usb_enable_link_state(hcd, udev, USB3_LPM_U2);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_enable_lpm);
|
|
|
|
/* Grab the bandwidth_mutex before calling usb_enable_lpm() */
|
|
void usb_unlocked_enable_lpm(struct usb_device *udev)
|
|
{
|
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
|
|
|
|
if (!hcd)
|
|
return;
|
|
|
|
mutex_lock(hcd->bandwidth_mutex);
|
|
usb_enable_lpm(udev);
|
|
mutex_unlock(hcd->bandwidth_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);
|
|
|
|
|
|
#else /* CONFIG_PM */
|
|
|
|
#define hub_suspend NULL
|
|
#define hub_resume NULL
|
|
#define hub_reset_resume NULL
|
|
|
|
int usb_disable_lpm(struct usb_device *udev)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_disable_lpm);
|
|
|
|
void usb_enable_lpm(struct usb_device *udev) { }
|
|
EXPORT_SYMBOL_GPL(usb_enable_lpm);
|
|
|
|
int usb_unlocked_disable_lpm(struct usb_device *udev)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);
|
|
|
|
void usb_unlocked_enable_lpm(struct usb_device *udev) { }
|
|
EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);
|
|
|
|
int usb_disable_ltm(struct usb_device *udev)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_disable_ltm);
|
|
|
|
void usb_enable_ltm(struct usb_device *udev) { }
|
|
EXPORT_SYMBOL_GPL(usb_enable_ltm);
|
|
#endif
|
|
|
|
|
|
/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
|
|
*
|
|
* Between connect detection and reset signaling there must be a delay
|
|
* of 100ms at least for debounce and power-settling. The corresponding
|
|
* timer shall restart whenever the downstream port detects a disconnect.
|
|
*
|
|
* Apparently there are some bluetooth and irda-dongles and a number of
|
|
* low-speed devices for which this debounce period may last over a second.
|
|
* Not covered by the spec - but easy to deal with.
|
|
*
|
|
* This implementation uses a 1500ms total debounce timeout; if the
|
|
* connection isn't stable by then it returns -ETIMEDOUT. It checks
|
|
* every 25ms for transient disconnects. When the port status has been
|
|
* unchanged for 100ms it returns the port status.
|
|
*/
|
|
static int hub_port_debounce(struct usb_hub *hub, int port1)
|
|
{
|
|
int ret;
|
|
int total_time, stable_time = 0;
|
|
u16 portchange, portstatus;
|
|
unsigned connection = 0xffff;
|
|
|
|
for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
|
|
ret = hub_port_status(hub, port1, &portstatus, &portchange);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
|
|
(portstatus & USB_PORT_STAT_CONNECTION) == connection) {
|
|
stable_time += HUB_DEBOUNCE_STEP;
|
|
if (stable_time >= HUB_DEBOUNCE_STABLE)
|
|
break;
|
|
} else {
|
|
stable_time = 0;
|
|
connection = portstatus & USB_PORT_STAT_CONNECTION;
|
|
}
|
|
|
|
if (portchange & USB_PORT_STAT_C_CONNECTION) {
|
|
clear_port_feature(hub->hdev, port1,
|
|
USB_PORT_FEAT_C_CONNECTION);
|
|
}
|
|
|
|
if (total_time >= HUB_DEBOUNCE_TIMEOUT)
|
|
break;
|
|
msleep(HUB_DEBOUNCE_STEP);
|
|
}
|
|
|
|
dev_dbg (hub->intfdev,
|
|
"debounce: port %d: total %dms stable %dms status 0x%x\n",
|
|
port1, total_time, stable_time, portstatus);
|
|
|
|
if (stable_time < HUB_DEBOUNCE_STABLE)
|
|
return -ETIMEDOUT;
|
|
return portstatus;
|
|
}
|
|
|
|
void usb_ep0_reinit(struct usb_device *udev)
|
|
{
|
|
usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
|
|
usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
|
|
usb_enable_endpoint(udev, &udev->ep0, true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_ep0_reinit);
|
|
|
|
#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
|
|
#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
|
|
|
|
static int hub_set_address(struct usb_device *udev, int devnum)
|
|
{
|
|
int retval;
|
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
|
|
|
|
/*
|
|
* The host controller will choose the device address,
|
|
* instead of the core having chosen it earlier
|
|
*/
|
|
if (!hcd->driver->address_device && devnum <= 1)
|
|
return -EINVAL;
|
|
if (udev->state == USB_STATE_ADDRESS)
|
|
return 0;
|
|
if (udev->state != USB_STATE_DEFAULT)
|
|
return -EINVAL;
|
|
if (hcd->driver->address_device)
|
|
retval = hcd->driver->address_device(hcd, udev);
|
|
else
|
|
retval = usb_control_msg(udev, usb_sndaddr0pipe(),
|
|
USB_REQ_SET_ADDRESS, 0, devnum, 0,
|
|
NULL, 0, USB_CTRL_SET_TIMEOUT);
|
|
if (retval == 0) {
|
|
update_devnum(udev, devnum);
|
|
/* Device now using proper address. */
|
|
usb_set_device_state(udev, USB_STATE_ADDRESS);
|
|
usb_ep0_reinit(udev);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/* Reset device, (re)assign address, get device descriptor.
|
|
* Device connection must be stable, no more debouncing needed.
|
|
* Returns device in USB_STATE_ADDRESS, except on error.
|
|
*
|
|
* If this is called for an already-existing device (as part of
|
|
* usb_reset_and_verify_device), the caller must own the device lock. For a
|
|
* newly detected device that is not accessible through any global
|
|
* pointers, it's not necessary to lock the device.
|
|
*/
|
|
static int
|
|
hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
|
|
int retry_counter)
|
|
{
|
|
static DEFINE_MUTEX(usb_address0_mutex);
|
|
|
|
struct usb_device *hdev = hub->hdev;
|
|
struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
|
|
int i, j, retval;
|
|
unsigned delay = HUB_SHORT_RESET_TIME;
|
|
enum usb_device_speed oldspeed = udev->speed;
|
|
const char *speed;
|
|
int devnum = udev->devnum;
|
|
|
|
/* root hub ports have a slightly longer reset period
|
|
* (from USB 2.0 spec, section 7.1.7.5)
|
|
*/
|
|
if (!hdev->parent) {
|
|
delay = HUB_ROOT_RESET_TIME;
|
|
if (port1 == hdev->bus->otg_port)
|
|
hdev->bus->b_hnp_enable = 0;
|
|
}
|
|
|
|
/* Some low speed devices have problems with the quick delay, so */
|
|
/* be a bit pessimistic with those devices. RHbug #23670 */
|
|
if (oldspeed == USB_SPEED_LOW)
|
|
delay = HUB_LONG_RESET_TIME;
|
|
|
|
mutex_lock(&usb_address0_mutex);
|
|
|
|
/* Reset the device; full speed may morph to high speed */
|
|
/* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
|
|
retval = hub_port_reset(hub, port1, udev, delay, false);
|
|
if (retval < 0) /* error or disconnect */
|
|
goto fail;
|
|
/* success, speed is known */
|
|
|
|
retval = -ENODEV;
|
|
|
|
if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
|
|
dev_dbg(&udev->dev, "device reset changed speed!\n");
|
|
goto fail;
|
|
}
|
|
oldspeed = udev->speed;
|
|
|
|
/* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
|
|
* it's fixed size except for full speed devices.
|
|
* For Wireless USB devices, ep0 max packet is always 512 (tho
|
|
* reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
|
|
*/
|
|
switch (udev->speed) {
|
|
case USB_SPEED_SUPER:
|
|
case USB_SPEED_WIRELESS: /* fixed at 512 */
|
|
udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
|
|
break;
|
|
case USB_SPEED_HIGH: /* fixed at 64 */
|
|
udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
|
|
break;
|
|
case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
|
|
/* to determine the ep0 maxpacket size, try to read
|
|
* the device descriptor to get bMaxPacketSize0 and
|
|
* then correct our initial guess.
|
|
*/
|
|
udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
|
|
break;
|
|
case USB_SPEED_LOW: /* fixed at 8 */
|
|
udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
|
|
break;
|
|
default:
|
|
goto fail;
|
|
}
|
|
|
|
if (udev->speed == USB_SPEED_WIRELESS)
|
|
speed = "variable speed Wireless";
|
|
else
|
|
speed = usb_speed_string(udev->speed);
|
|
|
|
if (udev->speed != USB_SPEED_SUPER)
|
|
dev_info(&udev->dev,
|
|
"%s %s USB device number %d using %s\n",
|
|
(udev->config) ? "reset" : "new", speed,
|
|
devnum, udev->bus->controller->driver->name);
|
|
|
|
/* Set up TT records, if needed */
|
|
if (hdev->tt) {
|
|
udev->tt = hdev->tt;
|
|
udev->ttport = hdev->ttport;
|
|
} else if (udev->speed != USB_SPEED_HIGH
|
|
&& hdev->speed == USB_SPEED_HIGH) {
|
|
if (!hub->tt.hub) {
|
|
dev_err(&udev->dev, "parent hub has no TT\n");
|
|
retval = -EINVAL;
|
|
goto fail;
|
|
}
|
|
udev->tt = &hub->tt;
|
|
udev->ttport = port1;
|
|
}
|
|
|
|
/* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
|
|
* Because device hardware and firmware is sometimes buggy in
|
|
* this area, and this is how Linux has done it for ages.
|
|
* Change it cautiously.
|
|
*
|
|
* NOTE: If USE_NEW_SCHEME() is true we will start by issuing
|
|
* a 64-byte GET_DESCRIPTOR request. This is what Windows does,
|
|
* so it may help with some non-standards-compliant devices.
|
|
* Otherwise we start with SET_ADDRESS and then try to read the
|
|
* first 8 bytes of the device descriptor to get the ep0 maxpacket
|
|
* value.
|
|
*/
|
|
for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
|
|
if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) {
|
|
struct usb_device_descriptor *buf;
|
|
int r = 0;
|
|
|
|
#define GET_DESCRIPTOR_BUFSIZE 64
|
|
buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
|
|
if (!buf) {
|
|
retval = -ENOMEM;
|
|
continue;
|
|
}
|
|
|
|
/* Retry on all errors; some devices are flakey.
|
|
* 255 is for WUSB devices, we actually need to use
|
|
* 512 (WUSB1.0[4.8.1]).
|
|
*/
|
|
for (j = 0; j < 3; ++j) {
|
|
buf->bMaxPacketSize0 = 0;
|
|
r = usb_control_msg(udev, usb_rcvaddr0pipe(),
|
|
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
|
|
USB_DT_DEVICE << 8, 0,
|
|
buf, GET_DESCRIPTOR_BUFSIZE,
|
|
initial_descriptor_timeout);
|
|
switch (buf->bMaxPacketSize0) {
|
|
case 8: case 16: case 32: case 64: case 255:
|
|
if (buf->bDescriptorType ==
|
|
USB_DT_DEVICE) {
|
|
r = 0;
|
|
break;
|
|
}
|
|
/* FALL THROUGH */
|
|
default:
|
|
if (r == 0)
|
|
r = -EPROTO;
|
|
break;
|
|
}
|
|
if (r == 0)
|
|
break;
|
|
}
|
|
udev->descriptor.bMaxPacketSize0 =
|
|
buf->bMaxPacketSize0;
|
|
kfree(buf);
|
|
|
|
retval = hub_port_reset(hub, port1, udev, delay, false);
|
|
if (retval < 0) /* error or disconnect */
|
|
goto fail;
|
|
if (oldspeed != udev->speed) {
|
|
dev_dbg(&udev->dev,
|
|
"device reset changed speed!\n");
|
|
retval = -ENODEV;
|
|
goto fail;
|
|
}
|
|
if (r) {
|
|
dev_err(&udev->dev,
|
|
"device descriptor read/64, error %d\n",
|
|
r);
|
|
retval = -EMSGSIZE;
|
|
continue;
|
|
}
|
|
#undef GET_DESCRIPTOR_BUFSIZE
|
|
}
|
|
|
|
/*
|
|
* If device is WUSB, we already assigned an
|
|
* unauthorized address in the Connect Ack sequence;
|
|
* authorization will assign the final address.
|
|
*/
|
|
if (udev->wusb == 0) {
|
|
for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
|
|
retval = hub_set_address(udev, devnum);
|
|
if (retval >= 0)
|
|
break;
|
|
msleep(200);
|
|
}
|
|
if (retval < 0) {
|
|
dev_err(&udev->dev,
|
|
"device not accepting address %d, error %d\n",
|
|
devnum, retval);
|
|
goto fail;
|
|
}
|
|
if (udev->speed == USB_SPEED_SUPER) {
|
|
devnum = udev->devnum;
|
|
dev_info(&udev->dev,
|
|
"%s SuperSpeed USB device number %d using %s\n",
|
|
(udev->config) ? "reset" : "new",
|
|
devnum, udev->bus->controller->driver->name);
|
|
}
|
|
|
|
/* cope with hardware quirkiness:
|
|
* - let SET_ADDRESS settle, some device hardware wants it
|
|
* - read ep0 maxpacket even for high and low speed,
|
|
*/
|
|
msleep(10);
|
|
if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3))
|
|
break;
|
|
}
|
|
|
|
retval = usb_get_device_descriptor(udev, 8);
|
|
if (retval < 8) {
|
|
dev_err(&udev->dev,
|
|
"device descriptor read/8, error %d\n",
|
|
retval);
|
|
if (retval >= 0)
|
|
retval = -EMSGSIZE;
|
|
} else {
|
|
retval = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (retval)
|
|
goto fail;
|
|
|
|
/*
|
|
* Some superspeed devices have finished the link training process
|
|
* and attached to a superspeed hub port, but the device descriptor
|
|
* got from those devices show they aren't superspeed devices. Warm
|
|
* reset the port attached by the devices can fix them.
|
|
*/
|
|
if ((udev->speed == USB_SPEED_SUPER) &&
|
|
(le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) {
|
|
dev_err(&udev->dev, "got a wrong device descriptor, "
|
|
"warm reset device\n");
|
|
hub_port_reset(hub, port1, udev,
|
|
HUB_BH_RESET_TIME, true);
|
|
retval = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
if (udev->descriptor.bMaxPacketSize0 == 0xff ||
|
|
udev->speed == USB_SPEED_SUPER)
|
|
i = 512;
|
|
else
|
|
i = udev->descriptor.bMaxPacketSize0;
|
|
if (usb_endpoint_maxp(&udev->ep0.desc) != i) {
|
|
if (udev->speed == USB_SPEED_LOW ||
|
|
!(i == 8 || i == 16 || i == 32 || i == 64)) {
|
|
dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i);
|
|
retval = -EMSGSIZE;
|
|
goto fail;
|
|
}
|
|
if (udev->speed == USB_SPEED_FULL)
|
|
dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
|
|
else
|
|
dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i);
|
|
udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
|
|
usb_ep0_reinit(udev);
|
|
}
|
|
|
|
retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
|
|
if (retval < (signed)sizeof(udev->descriptor)) {
|
|
dev_err(&udev->dev, "device descriptor read/all, error %d\n",
|
|
retval);
|
|
if (retval >= 0)
|
|
retval = -ENOMSG;
|
|
goto fail;
|
|
}
|
|
|
|
if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
|
|
retval = usb_get_bos_descriptor(udev);
|
|
if (!retval) {
|
|
udev->lpm_capable = usb_device_supports_lpm(udev);
|
|
usb_set_lpm_parameters(udev);
|
|
}
|
|
}
|
|
|
|
retval = 0;
|
|
/* notify HCD that we have a device connected and addressed */
|
|
if (hcd->driver->update_device)
|
|
hcd->driver->update_device(hcd, udev);
|
|
fail:
|
|
if (retval) {
|
|
hub_port_disable(hub, port1, 0);
|
|
update_devnum(udev, devnum); /* for disconnect processing */
|
|
}
|
|
mutex_unlock(&usb_address0_mutex);
|
|
return retval;
|
|
}
|
|
|
|
static void
|
|
check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
|
|
{
|
|
struct usb_qualifier_descriptor *qual;
|
|
int status;
|
|
|
|
qual = kmalloc (sizeof *qual, GFP_KERNEL);
|
|
if (qual == NULL)
|
|
return;
|
|
|
|
status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
|
|
qual, sizeof *qual);
|
|
if (status == sizeof *qual) {
|
|
dev_info(&udev->dev, "not running at top speed; "
|
|
"connect to a high speed hub\n");
|
|
/* hub LEDs are probably harder to miss than syslog */
|
|
if (hub->has_indicators) {
|
|
hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
|
|
schedule_delayed_work (&hub->leds, 0);
|
|
}
|
|
}
|
|
kfree(qual);
|
|
}
|
|
|
|
static unsigned
|
|
hub_power_remaining (struct usb_hub *hub)
|
|
{
|
|
struct usb_device *hdev = hub->hdev;
|
|
int remaining;
|
|
int port1;
|
|
|
|
if (!hub->limited_power)
|
|
return 0;
|
|
|
|
remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
|
|
for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
|
|
struct usb_device *udev = hub->ports[port1 - 1]->child;
|
|
int delta;
|
|
|
|
if (!udev)
|
|
continue;
|
|
|
|
/* Unconfigured devices may not use more than 100mA,
|
|
* or 8mA for OTG ports */
|
|
if (udev->actconfig)
|
|
delta = udev->actconfig->desc.bMaxPower * 2;
|
|
else if (port1 != udev->bus->otg_port || hdev->parent)
|
|
delta = 100;
|
|
else
|
|
delta = 8;
|
|
if (delta > hub->mA_per_port)
|
|
dev_warn(&udev->dev,
|
|
"%dmA is over %umA budget for port %d!\n",
|
|
delta, hub->mA_per_port, port1);
|
|
remaining -= delta;
|
|
}
|
|
if (remaining < 0) {
|
|
dev_warn(hub->intfdev, "%dmA over power budget!\n",
|
|
- remaining);
|
|
remaining = 0;
|
|
}
|
|
return remaining;
|
|
}
|
|
|
|
/* Handle physical or logical connection change events.
|
|
* This routine is called when:
|
|
* a port connection-change occurs;
|
|
* a port enable-change occurs (often caused by EMI);
|
|
* usb_reset_and_verify_device() encounters changed descriptors (as from
|
|
* a firmware download)
|
|
* caller already locked the hub
|
|
*/
|
|
static void hub_port_connect_change(struct usb_hub *hub, int port1,
|
|
u16 portstatus, u16 portchange)
|
|
{
|
|
struct usb_device *hdev = hub->hdev;
|
|
struct device *hub_dev = hub->intfdev;
|
|
struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
|
|
unsigned wHubCharacteristics =
|
|
le16_to_cpu(hub->descriptor->wHubCharacteristics);
|
|
struct usb_device *udev;
|
|
int status, i;
|
|
|
|
dev_dbg (hub_dev,
|
|
"port %d, status %04x, change %04x, %s\n",
|
|
port1, portstatus, portchange, portspeed(hub, portstatus));
|
|
|
|
if (hub->has_indicators) {
|
|
set_port_led(hub, port1, HUB_LED_AUTO);
|
|
hub->indicator[port1-1] = INDICATOR_AUTO;
|
|
}
|
|
|
|
#ifdef CONFIG_USB_OTG
|
|
/* during HNP, don't repeat the debounce */
|
|
if (hdev->bus->is_b_host)
|
|
portchange &= ~(USB_PORT_STAT_C_CONNECTION |
|
|
USB_PORT_STAT_C_ENABLE);
|
|
#endif
|
|
|
|
/* Try to resuscitate an existing device */
|
|
udev = hub->ports[port1 - 1]->child;
|
|
if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
|
|
udev->state != USB_STATE_NOTATTACHED) {
|
|
usb_lock_device(udev);
|
|
if (portstatus & USB_PORT_STAT_ENABLE) {
|
|
status = 0; /* Nothing to do */
|
|
|
|
#ifdef CONFIG_USB_SUSPEND
|
|
} else if (udev->state == USB_STATE_SUSPENDED &&
|
|
udev->persist_enabled) {
|
|
/* For a suspended device, treat this as a
|
|
* remote wakeup event.
|
|
*/
|
|
status = usb_remote_wakeup(udev);
|
|
#endif
|
|
|
|
} else {
|
|
status = -ENODEV; /* Don't resuscitate */
|
|
}
|
|
usb_unlock_device(udev);
|
|
|
|
if (status == 0) {
|
|
clear_bit(port1, hub->change_bits);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Disconnect any existing devices under this port */
|
|
if (udev)
|
|
usb_disconnect(&hub->ports[port1 - 1]->child);
|
|
clear_bit(port1, hub->change_bits);
|
|
|
|
/* We can forget about a "removed" device when there's a physical
|
|
* disconnect or the connect status changes.
|
|
*/
|
|
if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
|
|
(portchange & USB_PORT_STAT_C_CONNECTION))
|
|
clear_bit(port1, hub->removed_bits);
|
|
|
|
if (portchange & (USB_PORT_STAT_C_CONNECTION |
|
|
USB_PORT_STAT_C_ENABLE)) {
|
|
status = hub_port_debounce(hub, port1);
|
|
if (status < 0) {
|
|
if (printk_ratelimit())
|
|
dev_err(hub_dev, "connect-debounce failed, "
|
|
"port %d disabled\n", port1);
|
|
portstatus &= ~USB_PORT_STAT_CONNECTION;
|
|
} else {
|
|
portstatus = status;
|
|
}
|
|
}
|
|
|
|
if (hcd->phy && !hdev->parent) {
|
|
if (portstatus & USB_PORT_STAT_CONNECTION)
|
|
usb_phy_notify_connect(hcd->phy, port1);
|
|
else
|
|
usb_phy_notify_disconnect(hcd->phy, port1);
|
|
}
|
|
|
|
/* Return now if debouncing failed or nothing is connected or
|
|
* the device was "removed".
|
|
*/
|
|
if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
|
|
test_bit(port1, hub->removed_bits)) {
|
|
|
|
/* maybe switch power back on (e.g. root hub was reset) */
|
|
if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
|
|
&& !port_is_power_on(hub, portstatus))
|
|
set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
|
|
|
|
if (portstatus & USB_PORT_STAT_ENABLE)
|
|
goto done;
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < SET_CONFIG_TRIES; i++) {
|
|
|
|
/* reallocate for each attempt, since references
|
|
* to the previous one can escape in various ways
|
|
*/
|
|
udev = usb_alloc_dev(hdev, hdev->bus, port1);
|
|
if (!udev) {
|
|
dev_err (hub_dev,
|
|
"couldn't allocate port %d usb_device\n",
|
|
port1);
|
|
goto done;
|
|
}
|
|
|
|
usb_set_device_state(udev, USB_STATE_POWERED);
|
|
udev->bus_mA = hub->mA_per_port;
|
|
udev->level = hdev->level + 1;
|
|
udev->wusb = hub_is_wusb(hub);
|
|
|
|
/* Only USB 3.0 devices are connected to SuperSpeed hubs. */
|
|
if (hub_is_superspeed(hub->hdev))
|
|
udev->speed = USB_SPEED_SUPER;
|
|
else
|
|
udev->speed = USB_SPEED_UNKNOWN;
|
|
|
|
choose_devnum(udev);
|
|
if (udev->devnum <= 0) {
|
|
status = -ENOTCONN; /* Don't retry */
|
|
goto loop;
|
|
}
|
|
|
|
/* reset (non-USB 3.0 devices) and get descriptor */
|
|
status = hub_port_init(hub, udev, port1, i);
|
|
if (status < 0)
|
|
goto loop;
|
|
|
|
usb_detect_quirks(udev);
|
|
if (udev->quirks & USB_QUIRK_DELAY_INIT)
|
|
msleep(1000);
|
|
|
|
/* consecutive bus-powered hubs aren't reliable; they can
|
|
* violate the voltage drop budget. if the new child has
|
|
* a "powered" LED, users should notice we didn't enable it
|
|
* (without reading syslog), even without per-port LEDs
|
|
* on the parent.
|
|
*/
|
|
if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
|
|
&& udev->bus_mA <= 100) {
|
|
u16 devstat;
|
|
|
|
status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
|
|
&devstat);
|
|
if (status < 2) {
|
|
dev_dbg(&udev->dev, "get status %d ?\n", status);
|
|
goto loop_disable;
|
|
}
|
|
le16_to_cpus(&devstat);
|
|
if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
|
|
dev_err(&udev->dev,
|
|
"can't connect bus-powered hub "
|
|
"to this port\n");
|
|
if (hub->has_indicators) {
|
|
hub->indicator[port1-1] =
|
|
INDICATOR_AMBER_BLINK;
|
|
schedule_delayed_work (&hub->leds, 0);
|
|
}
|
|
status = -ENOTCONN; /* Don't retry */
|
|
goto loop_disable;
|
|
}
|
|
}
|
|
|
|
/* check for devices running slower than they could */
|
|
if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
|
|
&& udev->speed == USB_SPEED_FULL
|
|
&& highspeed_hubs != 0)
|
|
check_highspeed (hub, udev, port1);
|
|
|
|
/* Store the parent's children[] pointer. At this point
|
|
* udev becomes globally accessible, although presumably
|
|
* no one will look at it until hdev is unlocked.
|
|
*/
|
|
status = 0;
|
|
|
|
/* We mustn't add new devices if the parent hub has
|
|
* been disconnected; we would race with the
|
|
* recursively_mark_NOTATTACHED() routine.
|
|
*/
|
|
spin_lock_irq(&device_state_lock);
|
|
if (hdev->state == USB_STATE_NOTATTACHED)
|
|
status = -ENOTCONN;
|
|
else
|
|
hub->ports[port1 - 1]->child = udev;
|
|
spin_unlock_irq(&device_state_lock);
|
|
|
|
/* Run it through the hoops (find a driver, etc) */
|
|
if (!status) {
|
|
status = usb_new_device(udev);
|
|
if (status) {
|
|
spin_lock_irq(&device_state_lock);
|
|
hub->ports[port1 - 1]->child = NULL;
|
|
spin_unlock_irq(&device_state_lock);
|
|
}
|
|
}
|
|
|
|
if (status)
|
|
goto loop_disable;
|
|
|
|
status = hub_power_remaining(hub);
|
|
if (status)
|
|
dev_dbg(hub_dev, "%dmA power budget left\n", status);
|
|
|
|
return;
|
|
|
|
loop_disable:
|
|
hub_port_disable(hub, port1, 1);
|
|
loop:
|
|
usb_ep0_reinit(udev);
|
|
release_devnum(udev);
|
|
hub_free_dev(udev);
|
|
usb_put_dev(udev);
|
|
if ((status == -ENOTCONN) || (status == -ENOTSUPP))
|
|
break;
|
|
}
|
|
if (hub->hdev->parent ||
|
|
!hcd->driver->port_handed_over ||
|
|
!(hcd->driver->port_handed_over)(hcd, port1))
|
|
dev_err(hub_dev, "unable to enumerate USB device on port %d\n",
|
|
port1);
|
|
|
|
done:
|
|
hub_port_disable(hub, port1, 1);
|
|
if (hcd->driver->relinquish_port && !hub->hdev->parent)
|
|
hcd->driver->relinquish_port(hcd, port1);
|
|
}
|
|
|
|
/* Returns 1 if there was a remote wakeup and a connect status change. */
|
|
static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port,
|
|
u16 portstatus, u16 portchange)
|
|
{
|
|
struct usb_device *hdev;
|
|
struct usb_device *udev;
|
|
int connect_change = 0;
|
|
int ret;
|
|
|
|
hdev = hub->hdev;
|
|
udev = hub->ports[port - 1]->child;
|
|
if (!hub_is_superspeed(hdev)) {
|
|
if (!(portchange & USB_PORT_STAT_C_SUSPEND))
|
|
return 0;
|
|
clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND);
|
|
} else {
|
|
if (!udev || udev->state != USB_STATE_SUSPENDED ||
|
|
(portstatus & USB_PORT_STAT_LINK_STATE) !=
|
|
USB_SS_PORT_LS_U0)
|
|
return 0;
|
|
}
|
|
|
|
if (udev) {
|
|
/* TRSMRCY = 10 msec */
|
|
msleep(10);
|
|
|
|
usb_lock_device(udev);
|
|
ret = usb_remote_wakeup(udev);
|
|
usb_unlock_device(udev);
|
|
if (ret < 0)
|
|
connect_change = 1;
|
|
} else {
|
|
ret = -ENODEV;
|
|
hub_port_disable(hub, port, 1);
|
|
}
|
|
dev_dbg(hub->intfdev, "resume on port %d, status %d\n",
|
|
port, ret);
|
|
return connect_change;
|
|
}
|
|
|
|
static void hub_events(void)
|
|
{
|
|
struct list_head *tmp;
|
|
struct usb_device *hdev;
|
|
struct usb_interface *intf;
|
|
struct usb_hub *hub;
|
|
struct device *hub_dev;
|
|
u16 hubstatus;
|
|
u16 hubchange;
|
|
u16 portstatus;
|
|
u16 portchange;
|
|
int i, ret;
|
|
int connect_change, wakeup_change;
|
|
|
|
/*
|
|
* We restart the list every time to avoid a deadlock with
|
|
* deleting hubs downstream from this one. This should be
|
|
* safe since we delete the hub from the event list.
|
|
* Not the most efficient, but avoids deadlocks.
|
|
*/
|
|
while (1) {
|
|
|
|
/* Grab the first entry at the beginning of the list */
|
|
spin_lock_irq(&hub_event_lock);
|
|
if (list_empty(&hub_event_list)) {
|
|
spin_unlock_irq(&hub_event_lock);
|
|
break;
|
|
}
|
|
|
|
tmp = hub_event_list.next;
|
|
list_del_init(tmp);
|
|
|
|
hub = list_entry(tmp, struct usb_hub, event_list);
|
|
kref_get(&hub->kref);
|
|
spin_unlock_irq(&hub_event_lock);
|
|
|
|
hdev = hub->hdev;
|
|
hub_dev = hub->intfdev;
|
|
intf = to_usb_interface(hub_dev);
|
|
dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
|
|
hdev->state, hub->descriptor
|
|
? hub->descriptor->bNbrPorts
|
|
: 0,
|
|
/* NOTE: expects max 15 ports... */
|
|
(u16) hub->change_bits[0],
|
|
(u16) hub->event_bits[0]);
|
|
|
|
/* Lock the device, then check to see if we were
|
|
* disconnected while waiting for the lock to succeed. */
|
|
usb_lock_device(hdev);
|
|
if (unlikely(hub->disconnected))
|
|
goto loop_disconnected;
|
|
|
|
/* If the hub has died, clean up after it */
|
|
if (hdev->state == USB_STATE_NOTATTACHED) {
|
|
hub->error = -ENODEV;
|
|
hub_quiesce(hub, HUB_DISCONNECT);
|
|
goto loop;
|
|
}
|
|
|
|
/* Autoresume */
|
|
ret = usb_autopm_get_interface(intf);
|
|
if (ret) {
|
|
dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
|
|
goto loop;
|
|
}
|
|
|
|
/* If this is an inactive hub, do nothing */
|
|
if (hub->quiescing)
|
|
goto loop_autopm;
|
|
|
|
if (hub->error) {
|
|
dev_dbg (hub_dev, "resetting for error %d\n",
|
|
hub->error);
|
|
|
|
ret = usb_reset_device(hdev);
|
|
if (ret) {
|
|
dev_dbg (hub_dev,
|
|
"error resetting hub: %d\n", ret);
|
|
goto loop_autopm;
|
|
}
|
|
|
|
hub->nerrors = 0;
|
|
hub->error = 0;
|
|
}
|
|
|
|
/* deal with port status changes */
|
|
for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
|
|
if (test_bit(i, hub->busy_bits))
|
|
continue;
|
|
connect_change = test_bit(i, hub->change_bits);
|
|
wakeup_change = test_and_clear_bit(i, hub->wakeup_bits);
|
|
if (!test_and_clear_bit(i, hub->event_bits) &&
|
|
!connect_change && !wakeup_change)
|
|
continue;
|
|
|
|
ret = hub_port_status(hub, i,
|
|
&portstatus, &portchange);
|
|
if (ret < 0)
|
|
continue;
|
|
|
|
if (portchange & USB_PORT_STAT_C_CONNECTION) {
|
|
clear_port_feature(hdev, i,
|
|
USB_PORT_FEAT_C_CONNECTION);
|
|
connect_change = 1;
|
|
}
|
|
|
|
if (portchange & USB_PORT_STAT_C_ENABLE) {
|
|
if (!connect_change)
|
|
dev_dbg (hub_dev,
|
|
"port %d enable change, "
|
|
"status %08x\n",
|
|
i, portstatus);
|
|
clear_port_feature(hdev, i,
|
|
USB_PORT_FEAT_C_ENABLE);
|
|
|
|
/*
|
|
* EM interference sometimes causes badly
|
|
* shielded USB devices to be shutdown by
|
|
* the hub, this hack enables them again.
|
|
* Works at least with mouse driver.
|
|
*/
|
|
if (!(portstatus & USB_PORT_STAT_ENABLE)
|
|
&& !connect_change
|
|
&& hub->ports[i - 1]->child) {
|
|
dev_err (hub_dev,
|
|
"port %i "
|
|
"disabled by hub (EMI?), "
|
|
"re-enabling...\n",
|
|
i);
|
|
connect_change = 1;
|
|
}
|
|
}
|
|
|
|
if (hub_handle_remote_wakeup(hub, i,
|
|
portstatus, portchange))
|
|
connect_change = 1;
|
|
|
|
if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
|
|
u16 status = 0;
|
|
u16 unused;
|
|
|
|
dev_dbg(hub_dev, "over-current change on port "
|
|
"%d\n", i);
|
|
clear_port_feature(hdev, i,
|
|
USB_PORT_FEAT_C_OVER_CURRENT);
|
|
msleep(100); /* Cool down */
|
|
hub_power_on(hub, true);
|
|
hub_port_status(hub, i, &status, &unused);
|
|
if (status & USB_PORT_STAT_OVERCURRENT)
|
|
dev_err(hub_dev, "over-current "
|
|
"condition on port %d\n", i);
|
|
}
|
|
|
|
if (portchange & USB_PORT_STAT_C_RESET) {
|
|
dev_dbg (hub_dev,
|
|
"reset change on port %d\n",
|
|
i);
|
|
clear_port_feature(hdev, i,
|
|
USB_PORT_FEAT_C_RESET);
|
|
}
|
|
if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
|
|
hub_is_superspeed(hub->hdev)) {
|
|
dev_dbg(hub_dev,
|
|
"warm reset change on port %d\n",
|
|
i);
|
|
clear_port_feature(hdev, i,
|
|
USB_PORT_FEAT_C_BH_PORT_RESET);
|
|
}
|
|
if (portchange & USB_PORT_STAT_C_LINK_STATE) {
|
|
clear_port_feature(hub->hdev, i,
|
|
USB_PORT_FEAT_C_PORT_LINK_STATE);
|
|
}
|
|
if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) {
|
|
dev_warn(hub_dev,
|
|
"config error on port %d\n",
|
|
i);
|
|
clear_port_feature(hub->hdev, i,
|
|
USB_PORT_FEAT_C_PORT_CONFIG_ERROR);
|
|
}
|
|
|
|
/* Warm reset a USB3 protocol port if it's in
|
|
* SS.Inactive state.
|
|
*/
|
|
if (hub_port_warm_reset_required(hub, portstatus)) {
|
|
dev_dbg(hub_dev, "warm reset port %d\n", i);
|
|
hub_port_reset(hub, i, NULL,
|
|
HUB_BH_RESET_TIME, true);
|
|
}
|
|
|
|
if (connect_change)
|
|
hub_port_connect_change(hub, i,
|
|
portstatus, portchange);
|
|
} /* end for i */
|
|
|
|
/* deal with hub status changes */
|
|
if (test_and_clear_bit(0, hub->event_bits) == 0)
|
|
; /* do nothing */
|
|
else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
|
|
dev_err (hub_dev, "get_hub_status failed\n");
|
|
else {
|
|
if (hubchange & HUB_CHANGE_LOCAL_POWER) {
|
|
dev_dbg (hub_dev, "power change\n");
|
|
clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
|
|
if (hubstatus & HUB_STATUS_LOCAL_POWER)
|
|
/* FIXME: Is this always true? */
|
|
hub->limited_power = 1;
|
|
else
|
|
hub->limited_power = 0;
|
|
}
|
|
if (hubchange & HUB_CHANGE_OVERCURRENT) {
|
|
u16 status = 0;
|
|
u16 unused;
|
|
|
|
dev_dbg(hub_dev, "over-current change\n");
|
|
clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
|
|
msleep(500); /* Cool down */
|
|
hub_power_on(hub, true);
|
|
hub_hub_status(hub, &status, &unused);
|
|
if (status & HUB_STATUS_OVERCURRENT)
|
|
dev_err(hub_dev, "over-current "
|
|
"condition\n");
|
|
}
|
|
}
|
|
|
|
loop_autopm:
|
|
/* Balance the usb_autopm_get_interface() above */
|
|
usb_autopm_put_interface_no_suspend(intf);
|
|
loop:
|
|
/* Balance the usb_autopm_get_interface_no_resume() in
|
|
* kick_khubd() and allow autosuspend.
|
|
*/
|
|
usb_autopm_put_interface(intf);
|
|
loop_disconnected:
|
|
usb_unlock_device(hdev);
|
|
kref_put(&hub->kref, hub_release);
|
|
|
|
} /* end while (1) */
|
|
}
|
|
|
|
static int hub_thread(void *__unused)
|
|
{
|
|
/* khubd needs to be freezable to avoid intefering with USB-PERSIST
|
|
* port handover. Otherwise it might see that a full-speed device
|
|
* was gone before the EHCI controller had handed its port over to
|
|
* the companion full-speed controller.
|
|
*/
|
|
set_freezable();
|
|
|
|
do {
|
|
hub_events();
|
|
wait_event_freezable(khubd_wait,
|
|
!list_empty(&hub_event_list) ||
|
|
kthread_should_stop());
|
|
} while (!kthread_should_stop() || !list_empty(&hub_event_list));
|
|
|
|
pr_debug("%s: khubd exiting\n", usbcore_name);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t show_port_power_state(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct usb_device *udev = to_usb_device(dev->parent->parent);
|
|
struct usb_interface *intf = to_usb_interface(dev->parent);
|
|
int port1, power_state;
|
|
const char *result;
|
|
|
|
sscanf(dev_name(dev), "port%d", &port1);
|
|
usb_autopm_get_interface(intf);
|
|
power_state = usb_get_hub_port_power_state(udev, port1);
|
|
usb_autopm_put_interface(intf);
|
|
if (power_state == 1)
|
|
result = on_string;
|
|
else if (!power_state)
|
|
result = off_string;
|
|
else
|
|
result = "error";
|
|
return sprintf(buf, "%s\n", result);
|
|
}
|
|
static DEVICE_ATTR(state, S_IRUGO, show_port_power_state, NULL);
|
|
|
|
static ssize_t show_port_power_control(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct usb_port *hub_port = to_usb_port(dev);
|
|
const char *result;
|
|
|
|
switch (hub_port->port_power_policy) {
|
|
case USB_PORT_POWER_ON:
|
|
result = on_string;
|
|
break;
|
|
case USB_PORT_POWER_OFF:
|
|
result = off_string;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return sprintf(buf, "%s\n", result);
|
|
}
|
|
|
|
static ssize_t store_port_power_control(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct usb_device *hdev = to_usb_device(dev->parent->parent);
|
|
struct usb_interface *intf = to_usb_interface(dev->parent);
|
|
struct usb_port *hub_port = to_usb_port(dev);
|
|
int port1, ret, len = count;
|
|
char *cp;
|
|
|
|
sscanf(dev_name(dev), "port%d", &port1);
|
|
cp = memchr(buf, '\n', count);
|
|
if (cp)
|
|
len = cp - buf;
|
|
if (len == sizeof(on_string) - 1
|
|
&& strncmp(buf, on_string, len) == 0) {
|
|
hub_port->port_power_policy = USB_PORT_POWER_ON;
|
|
usb_autopm_get_interface(intf);
|
|
ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
|
|
usb_autopm_put_interface(intf);
|
|
if (ret < 0)
|
|
return -EIO;
|
|
} else if (len == sizeof(off_string) - 1
|
|
&& strncmp(buf, off_string, len) == 0) {
|
|
struct usb_hub *hub = hdev_to_hub(hdev);
|
|
|
|
hub_port->port_power_policy = USB_PORT_POWER_OFF;
|
|
usb_autopm_get_interface(intf);
|
|
hub_port_logical_disconnect(hub, port1);
|
|
ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
|
|
usb_autopm_put_interface(intf);
|
|
if (ret < 0)
|
|
return -EIO;
|
|
} else
|
|
return -EINVAL;
|
|
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR(control, S_IWUSR | S_IRUGO, show_port_power_control,
|
|
store_port_power_control);
|
|
|
|
static struct attribute *port_dev_attrs[] = {
|
|
&dev_attr_control.attr,
|
|
&dev_attr_state.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group port_dev_attr_grp = {
|
|
.attrs = port_dev_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *port_dev_group[] = {
|
|
&port_dev_attr_grp,
|
|
NULL,
|
|
};
|
|
|
|
static const struct usb_device_id hub_id_table[] = {
|
|
{ .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
|
|
.bDeviceClass = USB_CLASS_HUB},
|
|
{ .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
|
|
.bInterfaceClass = USB_CLASS_HUB},
|
|
{ } /* Terminating entry */
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE (usb, hub_id_table);
|
|
|
|
static struct usb_driver hub_driver = {
|
|
.name = "hub",
|
|
.probe = hub_probe,
|
|
.disconnect = hub_disconnect,
|
|
.suspend = hub_suspend,
|
|
.resume = hub_resume,
|
|
.reset_resume = hub_reset_resume,
|
|
.pre_reset = hub_pre_reset,
|
|
.post_reset = hub_post_reset,
|
|
.unlocked_ioctl = hub_ioctl,
|
|
.id_table = hub_id_table,
|
|
.supports_autosuspend = 1,
|
|
};
|
|
|
|
int usb_hub_init(void)
|
|
{
|
|
if (usb_register(&hub_driver) < 0) {
|
|
printk(KERN_ERR "%s: can't register hub driver\n",
|
|
usbcore_name);
|
|
return -1;
|
|
}
|
|
|
|
khubd_task = kthread_run(hub_thread, NULL, "khubd");
|
|
if (!IS_ERR(khubd_task))
|
|
return 0;
|
|
|
|
/* Fall through if kernel_thread failed */
|
|
usb_deregister(&hub_driver);
|
|
printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
|
|
|
|
return -1;
|
|
}
|
|
|
|
void usb_hub_cleanup(void)
|
|
{
|
|
kthread_stop(khubd_task);
|
|
|
|
/*
|
|
* Hub resources are freed for us by usb_deregister. It calls
|
|
* usb_driver_purge on every device which in turn calls that
|
|
* devices disconnect function if it is using this driver.
|
|
* The hub_disconnect function takes care of releasing the
|
|
* individual hub resources. -greg
|
|
*/
|
|
usb_deregister(&hub_driver);
|
|
} /* usb_hub_cleanup() */
|
|
|
|
static int descriptors_changed(struct usb_device *udev,
|
|
struct usb_device_descriptor *old_device_descriptor)
|
|
{
|
|
int changed = 0;
|
|
unsigned index;
|
|
unsigned serial_len = 0;
|
|
unsigned len;
|
|
unsigned old_length;
|
|
int length;
|
|
char *buf;
|
|
|
|
if (memcmp(&udev->descriptor, old_device_descriptor,
|
|
sizeof(*old_device_descriptor)) != 0)
|
|
return 1;
|
|
|
|
/* Since the idVendor, idProduct, and bcdDevice values in the
|
|
* device descriptor haven't changed, we will assume the
|
|
* Manufacturer and Product strings haven't changed either.
|
|
* But the SerialNumber string could be different (e.g., a
|
|
* different flash card of the same brand).
|
|
*/
|
|
if (udev->serial)
|
|
serial_len = strlen(udev->serial) + 1;
|
|
|
|
len = serial_len;
|
|
for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
|
|
old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
|
|
len = max(len, old_length);
|
|
}
|
|
|
|
buf = kmalloc(len, GFP_NOIO);
|
|
if (buf == NULL) {
|
|
dev_err(&udev->dev, "no mem to re-read configs after reset\n");
|
|
/* assume the worst */
|
|
return 1;
|
|
}
|
|
for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
|
|
old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
|
|
length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
|
|
old_length);
|
|
if (length != old_length) {
|
|
dev_dbg(&udev->dev, "config index %d, error %d\n",
|
|
index, length);
|
|
changed = 1;
|
|
break;
|
|
}
|
|
if (memcmp (buf, udev->rawdescriptors[index], old_length)
|
|
!= 0) {
|
|
dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
|
|
index,
|
|
((struct usb_config_descriptor *) buf)->
|
|
bConfigurationValue);
|
|
changed = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!changed && serial_len) {
|
|
length = usb_string(udev, udev->descriptor.iSerialNumber,
|
|
buf, serial_len);
|
|
if (length + 1 != serial_len) {
|
|
dev_dbg(&udev->dev, "serial string error %d\n",
|
|
length);
|
|
changed = 1;
|
|
} else if (memcmp(buf, udev->serial, length) != 0) {
|
|
dev_dbg(&udev->dev, "serial string changed\n");
|
|
changed = 1;
|
|
}
|
|
}
|
|
|
|
kfree(buf);
|
|
return changed;
|
|
}
|
|
|
|
/**
|
|
* usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
|
|
* @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
|
|
*
|
|
* WARNING - don't use this routine to reset a composite device
|
|
* (one with multiple interfaces owned by separate drivers)!
|
|
* Use usb_reset_device() instead.
|
|
*
|
|
* Do a port reset, reassign the device's address, and establish its
|
|
* former operating configuration. If the reset fails, or the device's
|
|
* descriptors change from their values before the reset, or the original
|
|
* configuration and altsettings cannot be restored, a flag will be set
|
|
* telling khubd to pretend the device has been disconnected and then
|
|
* re-connected. All drivers will be unbound, and the device will be
|
|
* re-enumerated and probed all over again.
|
|
*
|
|
* Returns 0 if the reset succeeded, -ENODEV if the device has been
|
|
* flagged for logical disconnection, or some other negative error code
|
|
* if the reset wasn't even attempted.
|
|
*
|
|
* The caller must own the device lock. For example, it's safe to use
|
|
* this from a driver probe() routine after downloading new firmware.
|
|
* For calls that might not occur during probe(), drivers should lock
|
|
* the device using usb_lock_device_for_reset().
|
|
*
|
|
* Locking exception: This routine may also be called from within an
|
|
* autoresume handler. Such usage won't conflict with other tasks
|
|
* holding the device lock because these tasks should always call
|
|
* usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
|
|
*/
|
|
static int usb_reset_and_verify_device(struct usb_device *udev)
|
|
{
|
|
struct usb_device *parent_hdev = udev->parent;
|
|
struct usb_hub *parent_hub;
|
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
|
|
struct usb_device_descriptor descriptor = udev->descriptor;
|
|
int i, ret = 0;
|
|
int port1 = udev->portnum;
|
|
|
|
if (udev->state == USB_STATE_NOTATTACHED ||
|
|
udev->state == USB_STATE_SUSPENDED) {
|
|
dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
|
|
udev->state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!parent_hdev) {
|
|
/* this requires hcd-specific logic; see ohci_restart() */
|
|
dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
|
|
return -EISDIR;
|
|
}
|
|
parent_hub = hdev_to_hub(parent_hdev);
|
|
|
|
/* Disable LPM and LTM while we reset the device and reinstall the alt
|
|
* settings. Device-initiated LPM settings, and system exit latency
|
|
* settings are cleared when the device is reset, so we have to set
|
|
* them up again.
|
|
*/
|
|
ret = usb_unlocked_disable_lpm(udev);
|
|
if (ret) {
|
|
dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__);
|
|
goto re_enumerate;
|
|
}
|
|
ret = usb_disable_ltm(udev);
|
|
if (ret) {
|
|
dev_err(&udev->dev, "%s Failed to disable LTM\n.",
|
|
__func__);
|
|
goto re_enumerate;
|
|
}
|
|
|
|
set_bit(port1, parent_hub->busy_bits);
|
|
for (i = 0; i < SET_CONFIG_TRIES; ++i) {
|
|
|
|
/* ep0 maxpacket size may change; let the HCD know about it.
|
|
* Other endpoints will be handled by re-enumeration. */
|
|
usb_ep0_reinit(udev);
|
|
ret = hub_port_init(parent_hub, udev, port1, i);
|
|
if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
|
|
break;
|
|
}
|
|
clear_bit(port1, parent_hub->busy_bits);
|
|
|
|
if (ret < 0)
|
|
goto re_enumerate;
|
|
|
|
/* Device might have changed firmware (DFU or similar) */
|
|
if (descriptors_changed(udev, &descriptor)) {
|
|
dev_info(&udev->dev, "device firmware changed\n");
|
|
udev->descriptor = descriptor; /* for disconnect() calls */
|
|
goto re_enumerate;
|
|
}
|
|
|
|
/* Restore the device's previous configuration */
|
|
if (!udev->actconfig)
|
|
goto done;
|
|
|
|
mutex_lock(hcd->bandwidth_mutex);
|
|
ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL);
|
|
if (ret < 0) {
|
|
dev_warn(&udev->dev,
|
|
"Busted HC? Not enough HCD resources for "
|
|
"old configuration.\n");
|
|
mutex_unlock(hcd->bandwidth_mutex);
|
|
goto re_enumerate;
|
|
}
|
|
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
|
|
USB_REQ_SET_CONFIGURATION, 0,
|
|
udev->actconfig->desc.bConfigurationValue, 0,
|
|
NULL, 0, USB_CTRL_SET_TIMEOUT);
|
|
if (ret < 0) {
|
|
dev_err(&udev->dev,
|
|
"can't restore configuration #%d (error=%d)\n",
|
|
udev->actconfig->desc.bConfigurationValue, ret);
|
|
mutex_unlock(hcd->bandwidth_mutex);
|
|
goto re_enumerate;
|
|
}
|
|
mutex_unlock(hcd->bandwidth_mutex);
|
|
usb_set_device_state(udev, USB_STATE_CONFIGURED);
|
|
|
|
/* Put interfaces back into the same altsettings as before.
|
|
* Don't bother to send the Set-Interface request for interfaces
|
|
* that were already in altsetting 0; besides being unnecessary,
|
|
* many devices can't handle it. Instead just reset the host-side
|
|
* endpoint state.
|
|
*/
|
|
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
|
|
struct usb_host_config *config = udev->actconfig;
|
|
struct usb_interface *intf = config->interface[i];
|
|
struct usb_interface_descriptor *desc;
|
|
|
|
desc = &intf->cur_altsetting->desc;
|
|
if (desc->bAlternateSetting == 0) {
|
|
usb_disable_interface(udev, intf, true);
|
|
usb_enable_interface(udev, intf, true);
|
|
ret = 0;
|
|
} else {
|
|
/* Let the bandwidth allocation function know that this
|
|
* device has been reset, and it will have to use
|
|
* alternate setting 0 as the current alternate setting.
|
|
*/
|
|
intf->resetting_device = 1;
|
|
ret = usb_set_interface(udev, desc->bInterfaceNumber,
|
|
desc->bAlternateSetting);
|
|
intf->resetting_device = 0;
|
|
}
|
|
if (ret < 0) {
|
|
dev_err(&udev->dev, "failed to restore interface %d "
|
|
"altsetting %d (error=%d)\n",
|
|
desc->bInterfaceNumber,
|
|
desc->bAlternateSetting,
|
|
ret);
|
|
goto re_enumerate;
|
|
}
|
|
}
|
|
|
|
done:
|
|
/* Now that the alt settings are re-installed, enable LTM and LPM. */
|
|
usb_unlocked_enable_lpm(udev);
|
|
usb_enable_ltm(udev);
|
|
return 0;
|
|
|
|
re_enumerate:
|
|
/* LPM state doesn't matter when we're about to destroy the device. */
|
|
hub_port_logical_disconnect(parent_hub, port1);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/**
|
|
* usb_reset_device - warn interface drivers and perform a USB port reset
|
|
* @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
|
|
*
|
|
* Warns all drivers bound to registered interfaces (using their pre_reset
|
|
* method), performs the port reset, and then lets the drivers know that
|
|
* the reset is over (using their post_reset method).
|
|
*
|
|
* Return value is the same as for usb_reset_and_verify_device().
|
|
*
|
|
* The caller must own the device lock. For example, it's safe to use
|
|
* this from a driver probe() routine after downloading new firmware.
|
|
* For calls that might not occur during probe(), drivers should lock
|
|
* the device using usb_lock_device_for_reset().
|
|
*
|
|
* If an interface is currently being probed or disconnected, we assume
|
|
* its driver knows how to handle resets. For all other interfaces,
|
|
* if the driver doesn't have pre_reset and post_reset methods then
|
|
* we attempt to unbind it and rebind afterward.
|
|
*/
|
|
int usb_reset_device(struct usb_device *udev)
|
|
{
|
|
int ret;
|
|
int i;
|
|
struct usb_host_config *config = udev->actconfig;
|
|
|
|
if (udev->state == USB_STATE_NOTATTACHED ||
|
|
udev->state == USB_STATE_SUSPENDED) {
|
|
dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
|
|
udev->state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Prevent autosuspend during the reset */
|
|
usb_autoresume_device(udev);
|
|
|
|
if (config) {
|
|
for (i = 0; i < config->desc.bNumInterfaces; ++i) {
|
|
struct usb_interface *cintf = config->interface[i];
|
|
struct usb_driver *drv;
|
|
int unbind = 0;
|
|
|
|
if (cintf->dev.driver) {
|
|
drv = to_usb_driver(cintf->dev.driver);
|
|
if (drv->pre_reset && drv->post_reset)
|
|
unbind = (drv->pre_reset)(cintf);
|
|
else if (cintf->condition ==
|
|
USB_INTERFACE_BOUND)
|
|
unbind = 1;
|
|
if (unbind)
|
|
usb_forced_unbind_intf(cintf);
|
|
}
|
|
}
|
|
}
|
|
|
|
ret = usb_reset_and_verify_device(udev);
|
|
|
|
if (config) {
|
|
for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
|
|
struct usb_interface *cintf = config->interface[i];
|
|
struct usb_driver *drv;
|
|
int rebind = cintf->needs_binding;
|
|
|
|
if (!rebind && cintf->dev.driver) {
|
|
drv = to_usb_driver(cintf->dev.driver);
|
|
if (drv->post_reset)
|
|
rebind = (drv->post_reset)(cintf);
|
|
else if (cintf->condition ==
|
|
USB_INTERFACE_BOUND)
|
|
rebind = 1;
|
|
}
|
|
if (ret == 0 && rebind)
|
|
usb_rebind_intf(cintf);
|
|
}
|
|
}
|
|
|
|
usb_autosuspend_device(udev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_reset_device);
|
|
|
|
|
|
/**
|
|
* usb_queue_reset_device - Reset a USB device from an atomic context
|
|
* @iface: USB interface belonging to the device to reset
|
|
*
|
|
* This function can be used to reset a USB device from an atomic
|
|
* context, where usb_reset_device() won't work (as it blocks).
|
|
*
|
|
* Doing a reset via this method is functionally equivalent to calling
|
|
* usb_reset_device(), except for the fact that it is delayed to a
|
|
* workqueue. This means that any drivers bound to other interfaces
|
|
* might be unbound, as well as users from usbfs in user space.
|
|
*
|
|
* Corner cases:
|
|
*
|
|
* - Scheduling two resets at the same time from two different drivers
|
|
* attached to two different interfaces of the same device is
|
|
* possible; depending on how the driver attached to each interface
|
|
* handles ->pre_reset(), the second reset might happen or not.
|
|
*
|
|
* - If a driver is unbound and it had a pending reset, the reset will
|
|
* be cancelled.
|
|
*
|
|
* - This function can be called during .probe() or .disconnect()
|
|
* times. On return from .disconnect(), any pending resets will be
|
|
* cancelled.
|
|
*
|
|
* There is no no need to lock/unlock the @reset_ws as schedule_work()
|
|
* does its own.
|
|
*
|
|
* NOTE: We don't do any reference count tracking because it is not
|
|
* needed. The lifecycle of the work_struct is tied to the
|
|
* usb_interface. Before destroying the interface we cancel the
|
|
* work_struct, so the fact that work_struct is queued and or
|
|
* running means the interface (and thus, the device) exist and
|
|
* are referenced.
|
|
*/
|
|
void usb_queue_reset_device(struct usb_interface *iface)
|
|
{
|
|
schedule_work(&iface->reset_ws);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_queue_reset_device);
|
|
|
|
/**
|
|
* usb_hub_find_child - Get the pointer of child device
|
|
* attached to the port which is specified by @port1.
|
|
* @hdev: USB device belonging to the usb hub
|
|
* @port1: port num to indicate which port the child device
|
|
* is attached to.
|
|
*
|
|
* USB drivers call this function to get hub's child device
|
|
* pointer.
|
|
*
|
|
* Return NULL if input param is invalid and
|
|
* child's usb_device pointer if non-NULL.
|
|
*/
|
|
struct usb_device *usb_hub_find_child(struct usb_device *hdev,
|
|
int port1)
|
|
{
|
|
struct usb_hub *hub = hdev_to_hub(hdev);
|
|
|
|
if (port1 < 1 || port1 > hdev->maxchild)
|
|
return NULL;
|
|
return hub->ports[port1 - 1]->child;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_hub_find_child);
|
|
|
|
/**
|
|
* usb_set_hub_port_connect_type - set hub port connect type.
|
|
* @hdev: USB device belonging to the usb hub
|
|
* @port1: port num of the port
|
|
* @type: connect type of the port
|
|
*/
|
|
void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1,
|
|
enum usb_port_connect_type type)
|
|
{
|
|
struct usb_hub *hub = hdev_to_hub(hdev);
|
|
|
|
hub->ports[port1 - 1]->connect_type = type;
|
|
}
|
|
|
|
/**
|
|
* usb_get_hub_port_connect_type - Get the port's connect type
|
|
* @hdev: USB device belonging to the usb hub
|
|
* @port1: port num of the port
|
|
*
|
|
* Return connect type of the port and if input params are
|
|
* invalid, return USB_PORT_CONNECT_TYPE_UNKNOWN.
|
|
*/
|
|
enum usb_port_connect_type
|
|
usb_get_hub_port_connect_type(struct usb_device *hdev, int port1)
|
|
{
|
|
struct usb_hub *hub = hdev_to_hub(hdev);
|
|
|
|
return hub->ports[port1 - 1]->connect_type;
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI
|
|
/**
|
|
* usb_get_hub_port_acpi_handle - Get the usb port's acpi handle
|
|
* @hdev: USB device belonging to the usb hub
|
|
* @port1: port num of the port
|
|
*
|
|
* Return port's acpi handle if successful, NULL if params are
|
|
* invaild.
|
|
*/
|
|
acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev,
|
|
int port1)
|
|
{
|
|
struct usb_hub *hub = hdev_to_hub(hdev);
|
|
|
|
return DEVICE_ACPI_HANDLE(&hub->ports[port1 - 1]->dev);
|
|
}
|
|
#endif
|