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e1f12eb6ba
Hub-initiated LPM is not good for USB communications devices. Comms devices should be able to tell when their link can go into a lower power state, because they know when an incoming transmission is finished. Ideally, these devices would slam their links into a lower power state, using the device-initiated LPM, after finishing the last packet of their data transfer. If we enable the idle timeouts for the parent hubs to enable hub-initiated LPM, we will get a lot of useless LPM packets on the bus as the devices reject LPM transitions when they're in the middle of receiving data. Worse, some devices might blindly accept the hub-initiated LPM and power down their radios while they're in the middle of receiving a transmission. The Intel Windows folks are disabling hub-initiated LPM for all USB communications devices under a xHCI USB 3.0 host. In order to keep the Linux behavior as close as possible to Windows, we need to do the same in Linux. Set the disable_hub_initiated_lpm flag for for all USB communications drivers. I know there aren't currently any USB 3.0 devices that implement these class specifications, but we should be ready if they do. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: Marcel Holtmann <marcel@holtmann.org> Cc: Gustavo Padovan <gustavo@padovan.org> Cc: Johan Hedberg <johan.hedberg@gmail.com> Cc: Hansjoerg Lipp <hjlipp@web.de> Cc: Tilman Schmidt <tilman@imap.cc> Cc: Karsten Keil <isdn@linux-pingi.de> Cc: Peter Korsgaard <jacmet@sunsite.dk> Cc: Jan Dumon <j.dumon@option.com> Cc: Petko Manolov <petkan@users.sourceforge.net> Cc: Steve Glendinning <steve.glendinning@smsc.com> Cc: "John W. Linville" <linville@tuxdriver.com> Cc: Kalle Valo <kvalo@qca.qualcomm.com> Cc: "Luis R. Rodriguez" <mcgrof@qca.qualcomm.com> Cc: Jouni Malinen <jouni@qca.qualcomm.com> Cc: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com> Cc: Senthil Balasubramanian <senthilb@qca.qualcomm.com> Cc: Christian Lamparter <chunkeey@googlemail.com> Cc: Brett Rudley <brudley@broadcom.com> Cc: Roland Vossen <rvossen@broadcom.com> Cc: Arend van Spriel <arend@broadcom.com> Cc: "Franky (Zhenhui) Lin" <frankyl@broadcom.com> Cc: Kan Yan <kanyan@broadcom.com> Cc: Dan Williams <dcbw@redhat.com> Cc: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Cc: Ivo van Doorn <IvDoorn@gmail.com> Cc: Gertjan van Wingerde <gwingerde@gmail.com> Cc: Helmut Schaa <helmut.schaa@googlemail.com> Cc: Herton Ronaldo Krzesinski <herton@canonical.com> Cc: Hin-Tak Leung <htl10@users.sourceforge.net> Cc: Larry Finger <Larry.Finger@lwfinger.net> Cc: Chaoming Li <chaoming_li@realsil.com.cn> Cc: Daniel Drake <dsd@gentoo.org> Cc: Ulrich Kunitz <kune@deine-taler.de> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
1045 lines
24 KiB
C
1045 lines
24 KiB
C
/*
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* cdc-wdm.c
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*
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* This driver supports USB CDC WCM Device Management.
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*
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* Copyright (c) 2007-2009 Oliver Neukum
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*
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* Some code taken from cdc-acm.c
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*
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* Released under the GPLv2.
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*
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* Many thanks to Carl Nordbeck
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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/slab.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/uaccess.h>
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#include <linux/bitops.h>
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#include <linux/poll.h>
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#include <linux/usb.h>
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#include <linux/usb/cdc.h>
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#include <asm/byteorder.h>
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#include <asm/unaligned.h>
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#include <linux/usb/cdc-wdm.h>
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v0.03"
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#define DRIVER_AUTHOR "Oliver Neukum"
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#define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management"
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#define HUAWEI_VENDOR_ID 0x12D1
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static const struct usb_device_id wdm_ids[] = {
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{
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.match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
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USB_DEVICE_ID_MATCH_INT_SUBCLASS,
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.bInterfaceClass = USB_CLASS_COMM,
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.bInterfaceSubClass = USB_CDC_SUBCLASS_DMM
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},
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{
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/*
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* Huawei E392, E398 and possibly other Qualcomm based modems
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* embed the Qualcomm QMI protocol inside CDC on CDC ECM like
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* control interfaces. Userspace access to this is required
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* to configure the accompanying data interface
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*/
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.match_flags = USB_DEVICE_ID_MATCH_VENDOR |
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USB_DEVICE_ID_MATCH_INT_INFO,
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.idVendor = HUAWEI_VENDOR_ID,
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.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
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.bInterfaceSubClass = 1,
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.bInterfaceProtocol = 9, /* NOTE: CDC ECM control interface! */
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},
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{ }
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};
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MODULE_DEVICE_TABLE (usb, wdm_ids);
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#define WDM_MINOR_BASE 176
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#define WDM_IN_USE 1
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#define WDM_DISCONNECTING 2
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#define WDM_RESULT 3
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#define WDM_READ 4
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#define WDM_INT_STALL 5
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#define WDM_POLL_RUNNING 6
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#define WDM_RESPONDING 7
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#define WDM_SUSPENDING 8
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#define WDM_RESETTING 9
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#define WDM_MAX 16
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/* CDC-WMC r1.1 requires wMaxCommand to be "at least 256 decimal (0x100)" */
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#define WDM_DEFAULT_BUFSIZE 256
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static DEFINE_MUTEX(wdm_mutex);
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static DEFINE_SPINLOCK(wdm_device_list_lock);
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static LIST_HEAD(wdm_device_list);
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/* --- method tables --- */
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struct wdm_device {
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u8 *inbuf; /* buffer for response */
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u8 *outbuf; /* buffer for command */
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u8 *sbuf; /* buffer for status */
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u8 *ubuf; /* buffer for copy to user space */
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struct urb *command;
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struct urb *response;
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struct urb *validity;
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struct usb_interface *intf;
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struct usb_ctrlrequest *orq;
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struct usb_ctrlrequest *irq;
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spinlock_t iuspin;
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unsigned long flags;
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u16 bufsize;
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u16 wMaxCommand;
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u16 wMaxPacketSize;
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__le16 inum;
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int reslength;
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int length;
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int read;
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int count;
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dma_addr_t shandle;
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dma_addr_t ihandle;
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struct mutex wlock;
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struct mutex rlock;
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wait_queue_head_t wait;
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struct work_struct rxwork;
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int werr;
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int rerr;
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struct list_head device_list;
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int (*manage_power)(struct usb_interface *, int);
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};
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static struct usb_driver wdm_driver;
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/* return intfdata if we own the interface, else look up intf in the list */
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static struct wdm_device *wdm_find_device(struct usb_interface *intf)
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{
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struct wdm_device *desc = NULL;
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spin_lock(&wdm_device_list_lock);
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list_for_each_entry(desc, &wdm_device_list, device_list)
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if (desc->intf == intf)
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break;
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spin_unlock(&wdm_device_list_lock);
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return desc;
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}
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static struct wdm_device *wdm_find_device_by_minor(int minor)
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{
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struct wdm_device *desc = NULL;
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spin_lock(&wdm_device_list_lock);
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list_for_each_entry(desc, &wdm_device_list, device_list)
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if (desc->intf->minor == minor)
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break;
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spin_unlock(&wdm_device_list_lock);
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return desc;
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}
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/* --- callbacks --- */
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static void wdm_out_callback(struct urb *urb)
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{
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struct wdm_device *desc;
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desc = urb->context;
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spin_lock(&desc->iuspin);
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desc->werr = urb->status;
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spin_unlock(&desc->iuspin);
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kfree(desc->outbuf);
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desc->outbuf = NULL;
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clear_bit(WDM_IN_USE, &desc->flags);
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wake_up(&desc->wait);
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}
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static void wdm_in_callback(struct urb *urb)
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{
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struct wdm_device *desc = urb->context;
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int status = urb->status;
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spin_lock(&desc->iuspin);
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clear_bit(WDM_RESPONDING, &desc->flags);
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if (status) {
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switch (status) {
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case -ENOENT:
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dev_dbg(&desc->intf->dev,
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"nonzero urb status received: -ENOENT");
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goto skip_error;
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case -ECONNRESET:
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dev_dbg(&desc->intf->dev,
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"nonzero urb status received: -ECONNRESET");
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goto skip_error;
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case -ESHUTDOWN:
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dev_dbg(&desc->intf->dev,
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"nonzero urb status received: -ESHUTDOWN");
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goto skip_error;
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case -EPIPE:
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dev_err(&desc->intf->dev,
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"nonzero urb status received: -EPIPE\n");
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break;
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default:
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dev_err(&desc->intf->dev,
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"Unexpected error %d\n", status);
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break;
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}
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}
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desc->rerr = status;
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desc->reslength = urb->actual_length;
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memmove(desc->ubuf + desc->length, desc->inbuf, desc->reslength);
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desc->length += desc->reslength;
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skip_error:
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wake_up(&desc->wait);
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set_bit(WDM_READ, &desc->flags);
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spin_unlock(&desc->iuspin);
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}
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static void wdm_int_callback(struct urb *urb)
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{
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int rv = 0;
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int status = urb->status;
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struct wdm_device *desc;
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struct usb_cdc_notification *dr;
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desc = urb->context;
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dr = (struct usb_cdc_notification *)desc->sbuf;
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if (status) {
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switch (status) {
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case -ESHUTDOWN:
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case -ENOENT:
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case -ECONNRESET:
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return; /* unplug */
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case -EPIPE:
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set_bit(WDM_INT_STALL, &desc->flags);
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dev_err(&desc->intf->dev, "Stall on int endpoint\n");
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goto sw; /* halt is cleared in work */
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default:
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dev_err(&desc->intf->dev,
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"nonzero urb status received: %d\n", status);
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break;
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}
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}
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if (urb->actual_length < sizeof(struct usb_cdc_notification)) {
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dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n",
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urb->actual_length);
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goto exit;
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}
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switch (dr->bNotificationType) {
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case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
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dev_dbg(&desc->intf->dev,
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"NOTIFY_RESPONSE_AVAILABLE received: index %d len %d",
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dr->wIndex, dr->wLength);
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break;
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case USB_CDC_NOTIFY_NETWORK_CONNECTION:
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dev_dbg(&desc->intf->dev,
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"NOTIFY_NETWORK_CONNECTION %s network",
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dr->wValue ? "connected to" : "disconnected from");
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goto exit;
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default:
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clear_bit(WDM_POLL_RUNNING, &desc->flags);
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dev_err(&desc->intf->dev,
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"unknown notification %d received: index %d len %d\n",
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dr->bNotificationType, dr->wIndex, dr->wLength);
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goto exit;
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}
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spin_lock(&desc->iuspin);
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clear_bit(WDM_READ, &desc->flags);
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set_bit(WDM_RESPONDING, &desc->flags);
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if (!test_bit(WDM_DISCONNECTING, &desc->flags)
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&& !test_bit(WDM_SUSPENDING, &desc->flags)) {
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rv = usb_submit_urb(desc->response, GFP_ATOMIC);
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dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d",
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__func__, rv);
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}
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spin_unlock(&desc->iuspin);
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if (rv < 0) {
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clear_bit(WDM_RESPONDING, &desc->flags);
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if (rv == -EPERM)
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return;
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if (rv == -ENOMEM) {
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sw:
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rv = schedule_work(&desc->rxwork);
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if (rv)
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dev_err(&desc->intf->dev,
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"Cannot schedule work\n");
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}
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}
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exit:
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rv = usb_submit_urb(urb, GFP_ATOMIC);
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if (rv)
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dev_err(&desc->intf->dev,
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"%s - usb_submit_urb failed with result %d\n",
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__func__, rv);
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}
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static void kill_urbs(struct wdm_device *desc)
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{
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/* the order here is essential */
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usb_kill_urb(desc->command);
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usb_kill_urb(desc->validity);
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usb_kill_urb(desc->response);
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}
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static void free_urbs(struct wdm_device *desc)
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{
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usb_free_urb(desc->validity);
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usb_free_urb(desc->response);
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usb_free_urb(desc->command);
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}
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static void cleanup(struct wdm_device *desc)
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{
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kfree(desc->sbuf);
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kfree(desc->inbuf);
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kfree(desc->orq);
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kfree(desc->irq);
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kfree(desc->ubuf);
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free_urbs(desc);
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kfree(desc);
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}
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static ssize_t wdm_write
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(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
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{
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u8 *buf;
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int rv = -EMSGSIZE, r, we;
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struct wdm_device *desc = file->private_data;
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struct usb_ctrlrequest *req;
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if (count > desc->wMaxCommand)
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count = desc->wMaxCommand;
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spin_lock_irq(&desc->iuspin);
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we = desc->werr;
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desc->werr = 0;
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spin_unlock_irq(&desc->iuspin);
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if (we < 0)
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return -EIO;
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buf = kmalloc(count, GFP_KERNEL);
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if (!buf) {
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rv = -ENOMEM;
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goto outnl;
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}
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r = copy_from_user(buf, buffer, count);
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if (r > 0) {
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kfree(buf);
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rv = -EFAULT;
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goto outnl;
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}
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/* concurrent writes and disconnect */
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r = mutex_lock_interruptible(&desc->wlock);
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rv = -ERESTARTSYS;
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if (r) {
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kfree(buf);
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goto outnl;
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}
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if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
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kfree(buf);
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rv = -ENODEV;
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goto outnp;
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}
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r = usb_autopm_get_interface(desc->intf);
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if (r < 0) {
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kfree(buf);
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rv = usb_translate_errors(r);
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goto outnp;
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}
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if (!(file->f_flags & O_NONBLOCK))
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r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE,
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&desc->flags));
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else
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if (test_bit(WDM_IN_USE, &desc->flags))
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r = -EAGAIN;
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if (test_bit(WDM_RESETTING, &desc->flags))
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r = -EIO;
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if (r < 0) {
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kfree(buf);
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rv = r;
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goto out;
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}
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req = desc->orq;
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usb_fill_control_urb(
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desc->command,
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interface_to_usbdev(desc->intf),
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/* using common endpoint 0 */
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usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0),
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(unsigned char *)req,
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buf,
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count,
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wdm_out_callback,
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desc
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);
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req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS |
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USB_RECIP_INTERFACE);
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req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
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req->wValue = 0;
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req->wIndex = desc->inum;
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req->wLength = cpu_to_le16(count);
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set_bit(WDM_IN_USE, &desc->flags);
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desc->outbuf = buf;
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rv = usb_submit_urb(desc->command, GFP_KERNEL);
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if (rv < 0) {
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kfree(buf);
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desc->outbuf = NULL;
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clear_bit(WDM_IN_USE, &desc->flags);
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dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv);
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rv = usb_translate_errors(rv);
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} else {
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dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d",
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req->wIndex);
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}
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out:
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usb_autopm_put_interface(desc->intf);
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outnp:
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mutex_unlock(&desc->wlock);
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outnl:
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return rv < 0 ? rv : count;
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}
|
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|
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static ssize_t wdm_read
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(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
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{
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int rv, cntr;
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int i = 0;
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struct wdm_device *desc = file->private_data;
|
|
|
|
|
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rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */
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if (rv < 0)
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return -ERESTARTSYS;
|
|
|
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cntr = ACCESS_ONCE(desc->length);
|
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if (cntr == 0) {
|
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desc->read = 0;
|
|
retry:
|
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if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
|
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rv = -ENODEV;
|
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goto err;
|
|
}
|
|
i++;
|
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if (file->f_flags & O_NONBLOCK) {
|
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if (!test_bit(WDM_READ, &desc->flags)) {
|
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rv = cntr ? cntr : -EAGAIN;
|
|
goto err;
|
|
}
|
|
rv = 0;
|
|
} else {
|
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rv = wait_event_interruptible(desc->wait,
|
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test_bit(WDM_READ, &desc->flags));
|
|
}
|
|
|
|
/* may have happened while we slept */
|
|
if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
|
|
rv = -ENODEV;
|
|
goto err;
|
|
}
|
|
if (test_bit(WDM_RESETTING, &desc->flags)) {
|
|
rv = -EIO;
|
|
goto err;
|
|
}
|
|
usb_mark_last_busy(interface_to_usbdev(desc->intf));
|
|
if (rv < 0) {
|
|
rv = -ERESTARTSYS;
|
|
goto err;
|
|
}
|
|
|
|
spin_lock_irq(&desc->iuspin);
|
|
|
|
if (desc->rerr) { /* read completed, error happened */
|
|
desc->rerr = 0;
|
|
spin_unlock_irq(&desc->iuspin);
|
|
rv = -EIO;
|
|
goto err;
|
|
}
|
|
/*
|
|
* recheck whether we've lost the race
|
|
* against the completion handler
|
|
*/
|
|
if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */
|
|
spin_unlock_irq(&desc->iuspin);
|
|
goto retry;
|
|
}
|
|
if (!desc->reslength) { /* zero length read */
|
|
spin_unlock_irq(&desc->iuspin);
|
|
goto retry;
|
|
}
|
|
cntr = desc->length;
|
|
spin_unlock_irq(&desc->iuspin);
|
|
}
|
|
|
|
if (cntr > count)
|
|
cntr = count;
|
|
rv = copy_to_user(buffer, desc->ubuf, cntr);
|
|
if (rv > 0) {
|
|
rv = -EFAULT;
|
|
goto err;
|
|
}
|
|
|
|
spin_lock_irq(&desc->iuspin);
|
|
|
|
for (i = 0; i < desc->length - cntr; i++)
|
|
desc->ubuf[i] = desc->ubuf[i + cntr];
|
|
|
|
desc->length -= cntr;
|
|
/* in case we had outstanding data */
|
|
if (!desc->length)
|
|
clear_bit(WDM_READ, &desc->flags);
|
|
|
|
spin_unlock_irq(&desc->iuspin);
|
|
|
|
rv = cntr;
|
|
|
|
err:
|
|
mutex_unlock(&desc->rlock);
|
|
return rv;
|
|
}
|
|
|
|
static int wdm_flush(struct file *file, fl_owner_t id)
|
|
{
|
|
struct wdm_device *desc = file->private_data;
|
|
|
|
wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags));
|
|
|
|
/* cannot dereference desc->intf if WDM_DISCONNECTING */
|
|
if (desc->werr < 0 && !test_bit(WDM_DISCONNECTING, &desc->flags))
|
|
dev_err(&desc->intf->dev, "Error in flush path: %d\n",
|
|
desc->werr);
|
|
|
|
return usb_translate_errors(desc->werr);
|
|
}
|
|
|
|
static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait)
|
|
{
|
|
struct wdm_device *desc = file->private_data;
|
|
unsigned long flags;
|
|
unsigned int mask = 0;
|
|
|
|
spin_lock_irqsave(&desc->iuspin, flags);
|
|
if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
|
|
mask = POLLHUP | POLLERR;
|
|
spin_unlock_irqrestore(&desc->iuspin, flags);
|
|
goto desc_out;
|
|
}
|
|
if (test_bit(WDM_READ, &desc->flags))
|
|
mask = POLLIN | POLLRDNORM;
|
|
if (desc->rerr || desc->werr)
|
|
mask |= POLLERR;
|
|
if (!test_bit(WDM_IN_USE, &desc->flags))
|
|
mask |= POLLOUT | POLLWRNORM;
|
|
spin_unlock_irqrestore(&desc->iuspin, flags);
|
|
|
|
poll_wait(file, &desc->wait, wait);
|
|
|
|
desc_out:
|
|
return mask;
|
|
}
|
|
|
|
static int wdm_open(struct inode *inode, struct file *file)
|
|
{
|
|
int minor = iminor(inode);
|
|
int rv = -ENODEV;
|
|
struct usb_interface *intf;
|
|
struct wdm_device *desc;
|
|
|
|
mutex_lock(&wdm_mutex);
|
|
desc = wdm_find_device_by_minor(minor);
|
|
if (!desc)
|
|
goto out;
|
|
|
|
intf = desc->intf;
|
|
if (test_bit(WDM_DISCONNECTING, &desc->flags))
|
|
goto out;
|
|
file->private_data = desc;
|
|
|
|
rv = usb_autopm_get_interface(desc->intf);
|
|
if (rv < 0) {
|
|
dev_err(&desc->intf->dev, "Error autopm - %d\n", rv);
|
|
goto out;
|
|
}
|
|
|
|
/* using write lock to protect desc->count */
|
|
mutex_lock(&desc->wlock);
|
|
if (!desc->count++) {
|
|
desc->werr = 0;
|
|
desc->rerr = 0;
|
|
rv = usb_submit_urb(desc->validity, GFP_KERNEL);
|
|
if (rv < 0) {
|
|
desc->count--;
|
|
dev_err(&desc->intf->dev,
|
|
"Error submitting int urb - %d\n", rv);
|
|
rv = usb_translate_errors(rv);
|
|
}
|
|
} else {
|
|
rv = 0;
|
|
}
|
|
mutex_unlock(&desc->wlock);
|
|
if (desc->count == 1)
|
|
desc->manage_power(intf, 1);
|
|
usb_autopm_put_interface(desc->intf);
|
|
out:
|
|
mutex_unlock(&wdm_mutex);
|
|
return rv;
|
|
}
|
|
|
|
static int wdm_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct wdm_device *desc = file->private_data;
|
|
|
|
mutex_lock(&wdm_mutex);
|
|
|
|
/* using write lock to protect desc->count */
|
|
mutex_lock(&desc->wlock);
|
|
desc->count--;
|
|
mutex_unlock(&desc->wlock);
|
|
|
|
if (!desc->count) {
|
|
if (!test_bit(WDM_DISCONNECTING, &desc->flags)) {
|
|
dev_dbg(&desc->intf->dev, "wdm_release: cleanup");
|
|
kill_urbs(desc);
|
|
desc->manage_power(desc->intf, 0);
|
|
} else {
|
|
/* must avoid dev_printk here as desc->intf is invalid */
|
|
pr_debug(KBUILD_MODNAME " %s: device gone - cleaning up\n", __func__);
|
|
cleanup(desc);
|
|
}
|
|
}
|
|
mutex_unlock(&wdm_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations wdm_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = wdm_read,
|
|
.write = wdm_write,
|
|
.open = wdm_open,
|
|
.flush = wdm_flush,
|
|
.release = wdm_release,
|
|
.poll = wdm_poll,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static struct usb_class_driver wdm_class = {
|
|
.name = "cdc-wdm%d",
|
|
.fops = &wdm_fops,
|
|
.minor_base = WDM_MINOR_BASE,
|
|
};
|
|
|
|
/* --- error handling --- */
|
|
static void wdm_rxwork(struct work_struct *work)
|
|
{
|
|
struct wdm_device *desc = container_of(work, struct wdm_device, rxwork);
|
|
unsigned long flags;
|
|
int rv;
|
|
|
|
spin_lock_irqsave(&desc->iuspin, flags);
|
|
if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
|
|
spin_unlock_irqrestore(&desc->iuspin, flags);
|
|
} else {
|
|
spin_unlock_irqrestore(&desc->iuspin, flags);
|
|
rv = usb_submit_urb(desc->response, GFP_KERNEL);
|
|
if (rv < 0 && rv != -EPERM) {
|
|
spin_lock_irqsave(&desc->iuspin, flags);
|
|
if (!test_bit(WDM_DISCONNECTING, &desc->flags))
|
|
schedule_work(&desc->rxwork);
|
|
spin_unlock_irqrestore(&desc->iuspin, flags);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* --- hotplug --- */
|
|
|
|
static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor *ep,
|
|
u16 bufsize, int (*manage_power)(struct usb_interface *, int))
|
|
{
|
|
int rv = -ENOMEM;
|
|
struct wdm_device *desc;
|
|
|
|
desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL);
|
|
if (!desc)
|
|
goto out;
|
|
INIT_LIST_HEAD(&desc->device_list);
|
|
mutex_init(&desc->rlock);
|
|
mutex_init(&desc->wlock);
|
|
spin_lock_init(&desc->iuspin);
|
|
init_waitqueue_head(&desc->wait);
|
|
desc->wMaxCommand = bufsize;
|
|
/* this will be expanded and needed in hardware endianness */
|
|
desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber);
|
|
desc->intf = intf;
|
|
INIT_WORK(&desc->rxwork, wdm_rxwork);
|
|
|
|
rv = -EINVAL;
|
|
if (!usb_endpoint_is_int_in(ep))
|
|
goto err;
|
|
|
|
desc->wMaxPacketSize = usb_endpoint_maxp(ep);
|
|
|
|
desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
|
|
if (!desc->orq)
|
|
goto err;
|
|
desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
|
|
if (!desc->irq)
|
|
goto err;
|
|
|
|
desc->validity = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!desc->validity)
|
|
goto err;
|
|
|
|
desc->response = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!desc->response)
|
|
goto err;
|
|
|
|
desc->command = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!desc->command)
|
|
goto err;
|
|
|
|
desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL);
|
|
if (!desc->ubuf)
|
|
goto err;
|
|
|
|
desc->sbuf = kmalloc(desc->wMaxPacketSize, GFP_KERNEL);
|
|
if (!desc->sbuf)
|
|
goto err;
|
|
|
|
desc->inbuf = kmalloc(desc->wMaxCommand, GFP_KERNEL);
|
|
if (!desc->inbuf)
|
|
goto err;
|
|
|
|
usb_fill_int_urb(
|
|
desc->validity,
|
|
interface_to_usbdev(intf),
|
|
usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress),
|
|
desc->sbuf,
|
|
desc->wMaxPacketSize,
|
|
wdm_int_callback,
|
|
desc,
|
|
ep->bInterval
|
|
);
|
|
|
|
desc->irq->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE);
|
|
desc->irq->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
|
|
desc->irq->wValue = 0;
|
|
desc->irq->wIndex = desc->inum;
|
|
desc->irq->wLength = cpu_to_le16(desc->wMaxCommand);
|
|
|
|
usb_fill_control_urb(
|
|
desc->response,
|
|
interface_to_usbdev(intf),
|
|
/* using common endpoint 0 */
|
|
usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
|
|
(unsigned char *)desc->irq,
|
|
desc->inbuf,
|
|
desc->wMaxCommand,
|
|
wdm_in_callback,
|
|
desc
|
|
);
|
|
|
|
desc->manage_power = manage_power;
|
|
|
|
spin_lock(&wdm_device_list_lock);
|
|
list_add(&desc->device_list, &wdm_device_list);
|
|
spin_unlock(&wdm_device_list_lock);
|
|
|
|
rv = usb_register_dev(intf, &wdm_class);
|
|
if (rv < 0)
|
|
goto err;
|
|
else
|
|
dev_info(&intf->dev, "%s: USB WDM device\n", dev_name(intf->usb_dev));
|
|
out:
|
|
return rv;
|
|
err:
|
|
spin_lock(&wdm_device_list_lock);
|
|
list_del(&desc->device_list);
|
|
spin_unlock(&wdm_device_list_lock);
|
|
cleanup(desc);
|
|
return rv;
|
|
}
|
|
|
|
static int wdm_manage_power(struct usb_interface *intf, int on)
|
|
{
|
|
/* need autopm_get/put here to ensure the usbcore sees the new value */
|
|
int rv = usb_autopm_get_interface(intf);
|
|
if (rv < 0)
|
|
goto err;
|
|
|
|
intf->needs_remote_wakeup = on;
|
|
usb_autopm_put_interface(intf);
|
|
err:
|
|
return rv;
|
|
}
|
|
|
|
static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id)
|
|
{
|
|
int rv = -EINVAL;
|
|
struct usb_host_interface *iface;
|
|
struct usb_endpoint_descriptor *ep;
|
|
struct usb_cdc_dmm_desc *dmhd;
|
|
u8 *buffer = intf->altsetting->extra;
|
|
int buflen = intf->altsetting->extralen;
|
|
u16 maxcom = WDM_DEFAULT_BUFSIZE;
|
|
|
|
if (!buffer)
|
|
goto err;
|
|
while (buflen > 2) {
|
|
if (buffer[1] != USB_DT_CS_INTERFACE) {
|
|
dev_err(&intf->dev, "skipping garbage\n");
|
|
goto next_desc;
|
|
}
|
|
|
|
switch (buffer[2]) {
|
|
case USB_CDC_HEADER_TYPE:
|
|
break;
|
|
case USB_CDC_DMM_TYPE:
|
|
dmhd = (struct usb_cdc_dmm_desc *)buffer;
|
|
maxcom = le16_to_cpu(dmhd->wMaxCommand);
|
|
dev_dbg(&intf->dev,
|
|
"Finding maximum buffer length: %d", maxcom);
|
|
break;
|
|
default:
|
|
dev_err(&intf->dev,
|
|
"Ignoring extra header, type %d, length %d\n",
|
|
buffer[2], buffer[0]);
|
|
break;
|
|
}
|
|
next_desc:
|
|
buflen -= buffer[0];
|
|
buffer += buffer[0];
|
|
}
|
|
|
|
iface = intf->cur_altsetting;
|
|
if (iface->desc.bNumEndpoints != 1)
|
|
goto err;
|
|
ep = &iface->endpoint[0].desc;
|
|
|
|
rv = wdm_create(intf, ep, maxcom, &wdm_manage_power);
|
|
|
|
err:
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* usb_cdc_wdm_register - register a WDM subdriver
|
|
* @intf: usb interface the subdriver will associate with
|
|
* @ep: interrupt endpoint to monitor for notifications
|
|
* @bufsize: maximum message size to support for read/write
|
|
*
|
|
* Create WDM usb class character device and associate it with intf
|
|
* without binding, allowing another driver to manage the interface.
|
|
*
|
|
* The subdriver will manage the given interrupt endpoint exclusively
|
|
* and will issue control requests referring to the given intf. It
|
|
* will otherwise avoid interferring, and in particular not do
|
|
* usb_set_intfdata/usb_get_intfdata on intf.
|
|
*
|
|
* The return value is a pointer to the subdriver's struct usb_driver.
|
|
* The registering driver is responsible for calling this subdriver's
|
|
* disconnect, suspend, resume, pre_reset and post_reset methods from
|
|
* its own.
|
|
*/
|
|
struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf,
|
|
struct usb_endpoint_descriptor *ep,
|
|
int bufsize,
|
|
int (*manage_power)(struct usb_interface *, int))
|
|
{
|
|
int rv = -EINVAL;
|
|
|
|
rv = wdm_create(intf, ep, bufsize, manage_power);
|
|
if (rv < 0)
|
|
goto err;
|
|
|
|
return &wdm_driver;
|
|
err:
|
|
return ERR_PTR(rv);
|
|
}
|
|
EXPORT_SYMBOL(usb_cdc_wdm_register);
|
|
|
|
static void wdm_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct wdm_device *desc;
|
|
unsigned long flags;
|
|
|
|
usb_deregister_dev(intf, &wdm_class);
|
|
desc = wdm_find_device(intf);
|
|
mutex_lock(&wdm_mutex);
|
|
|
|
/* the spinlock makes sure no new urbs are generated in the callbacks */
|
|
spin_lock_irqsave(&desc->iuspin, flags);
|
|
set_bit(WDM_DISCONNECTING, &desc->flags);
|
|
set_bit(WDM_READ, &desc->flags);
|
|
/* to terminate pending flushes */
|
|
clear_bit(WDM_IN_USE, &desc->flags);
|
|
spin_unlock_irqrestore(&desc->iuspin, flags);
|
|
wake_up_all(&desc->wait);
|
|
mutex_lock(&desc->rlock);
|
|
mutex_lock(&desc->wlock);
|
|
kill_urbs(desc);
|
|
cancel_work_sync(&desc->rxwork);
|
|
mutex_unlock(&desc->wlock);
|
|
mutex_unlock(&desc->rlock);
|
|
|
|
/* the desc->intf pointer used as list key is now invalid */
|
|
spin_lock(&wdm_device_list_lock);
|
|
list_del(&desc->device_list);
|
|
spin_unlock(&wdm_device_list_lock);
|
|
|
|
if (!desc->count)
|
|
cleanup(desc);
|
|
else
|
|
dev_dbg(&intf->dev, "%s: %d open files - postponing cleanup\n", __func__, desc->count);
|
|
mutex_unlock(&wdm_mutex);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int wdm_suspend(struct usb_interface *intf, pm_message_t message)
|
|
{
|
|
struct wdm_device *desc = wdm_find_device(intf);
|
|
int rv = 0;
|
|
|
|
dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor);
|
|
|
|
/* if this is an autosuspend the caller does the locking */
|
|
if (!PMSG_IS_AUTO(message)) {
|
|
mutex_lock(&desc->rlock);
|
|
mutex_lock(&desc->wlock);
|
|
}
|
|
spin_lock_irq(&desc->iuspin);
|
|
|
|
if (PMSG_IS_AUTO(message) &&
|
|
(test_bit(WDM_IN_USE, &desc->flags)
|
|
|| test_bit(WDM_RESPONDING, &desc->flags))) {
|
|
spin_unlock_irq(&desc->iuspin);
|
|
rv = -EBUSY;
|
|
} else {
|
|
|
|
set_bit(WDM_SUSPENDING, &desc->flags);
|
|
spin_unlock_irq(&desc->iuspin);
|
|
/* callback submits work - order is essential */
|
|
kill_urbs(desc);
|
|
cancel_work_sync(&desc->rxwork);
|
|
}
|
|
if (!PMSG_IS_AUTO(message)) {
|
|
mutex_unlock(&desc->wlock);
|
|
mutex_unlock(&desc->rlock);
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
#endif
|
|
|
|
static int recover_from_urb_loss(struct wdm_device *desc)
|
|
{
|
|
int rv = 0;
|
|
|
|
if (desc->count) {
|
|
rv = usb_submit_urb(desc->validity, GFP_NOIO);
|
|
if (rv < 0)
|
|
dev_err(&desc->intf->dev,
|
|
"Error resume submitting int urb - %d\n", rv);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int wdm_resume(struct usb_interface *intf)
|
|
{
|
|
struct wdm_device *desc = wdm_find_device(intf);
|
|
int rv;
|
|
|
|
dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor);
|
|
|
|
clear_bit(WDM_SUSPENDING, &desc->flags);
|
|
rv = recover_from_urb_loss(desc);
|
|
|
|
return rv;
|
|
}
|
|
#endif
|
|
|
|
static int wdm_pre_reset(struct usb_interface *intf)
|
|
{
|
|
struct wdm_device *desc = wdm_find_device(intf);
|
|
|
|
/*
|
|
* we notify everybody using poll of
|
|
* an exceptional situation
|
|
* must be done before recovery lest a spontaneous
|
|
* message from the device is lost
|
|
*/
|
|
spin_lock_irq(&desc->iuspin);
|
|
set_bit(WDM_RESETTING, &desc->flags); /* inform read/write */
|
|
set_bit(WDM_READ, &desc->flags); /* unblock read */
|
|
clear_bit(WDM_IN_USE, &desc->flags); /* unblock write */
|
|
desc->rerr = -EINTR;
|
|
spin_unlock_irq(&desc->iuspin);
|
|
wake_up_all(&desc->wait);
|
|
mutex_lock(&desc->rlock);
|
|
mutex_lock(&desc->wlock);
|
|
kill_urbs(desc);
|
|
cancel_work_sync(&desc->rxwork);
|
|
return 0;
|
|
}
|
|
|
|
static int wdm_post_reset(struct usb_interface *intf)
|
|
{
|
|
struct wdm_device *desc = wdm_find_device(intf);
|
|
int rv;
|
|
|
|
clear_bit(WDM_RESETTING, &desc->flags);
|
|
rv = recover_from_urb_loss(desc);
|
|
mutex_unlock(&desc->wlock);
|
|
mutex_unlock(&desc->rlock);
|
|
return 0;
|
|
}
|
|
|
|
static struct usb_driver wdm_driver = {
|
|
.name = "cdc_wdm",
|
|
.probe = wdm_probe,
|
|
.disconnect = wdm_disconnect,
|
|
#ifdef CONFIG_PM
|
|
.suspend = wdm_suspend,
|
|
.resume = wdm_resume,
|
|
.reset_resume = wdm_resume,
|
|
#endif
|
|
.pre_reset = wdm_pre_reset,
|
|
.post_reset = wdm_post_reset,
|
|
.id_table = wdm_ids,
|
|
.supports_autosuspend = 1,
|
|
.disable_hub_initiated_lpm = 1,
|
|
};
|
|
|
|
module_usb_driver(wdm_driver);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|