linux/drivers/usb/core/devices.c

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/*
* devices.c
* (C) Copyright 1999 Randy Dunlap.
* (C) Copyright 1999,2000 Thomas Sailer <sailer@ife.ee.ethz.ch>.
* (proc file per device)
* (C) Copyright 1999 Deti Fliegl (new USB architecture)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*************************************************************
*
* <mountpoint>/devices contains USB topology, device, config, class,
* interface, & endpoint data.
*
* I considered using /proc/bus/usb/devices/device# for each device
* as it is attached or detached, but I didn't like this for some
* reason -- maybe it's just too deep of a directory structure.
* I also don't like looking in multiple places to gather and view
* the data. Having only one file for ./devices also prevents race
* conditions that could arise if a program was reading device info
* for devices that are being removed (unplugged). (That is, the
* program may find a directory for devnum_12 then try to open it,
* but it was just unplugged, so the directory is now deleted.
* But programs would just have to be prepared for situations like
* this in any plug-and-play environment.)
*
* 1999-12-16: Thomas Sailer <sailer@ife.ee.ethz.ch>
* Converted the whole proc stuff to real
* read methods. Now not the whole device list needs to fit
* into one page, only the device list for one bus.
* Added a poll method to /proc/bus/usb/devices, to wake
* up an eventual usbd
* 2000-01-04: Thomas Sailer <sailer@ife.ee.ethz.ch>
* Turned into its own filesystem
* 2000-07-05: Ashley Montanaro <ashley@compsoc.man.ac.uk>
* Converted file reading routine to dump to buffer once
* per device, not per bus
*/
#include <linux/fs.h>
#include <linux/mm.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/gfp.h>
#include <linux/poll.h>
#include <linux/usb.h>
#include <linux/usbdevice_fs.h>
#include <linux/usb/hcd.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include "usb.h"
/* Define ALLOW_SERIAL_NUMBER if you want to see the serial number of devices */
#define ALLOW_SERIAL_NUMBER
static const char *format_topo =
/* T: Bus=dd Lev=dd Prnt=dd Port=dd Cnt=dd Dev#=ddd Spd=dddd MxCh=dd */
"\nT: Bus=%2.2d Lev=%2.2d Prnt=%2.2d Port=%2.2d Cnt=%2.2d Dev#=%3d Spd=%-4s MxCh=%2d\n";
static const char *format_string_manufacturer =
/* S: Manufacturer=xxxx */
"S: Manufacturer=%.100s\n";
static const char *format_string_product =
/* S: Product=xxxx */
"S: Product=%.100s\n";
#ifdef ALLOW_SERIAL_NUMBER
static const char *format_string_serialnumber =
/* S: SerialNumber=xxxx */
"S: SerialNumber=%.100s\n";
#endif
static const char *format_bandwidth =
/* B: Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd */
"B: Alloc=%3d/%3d us (%2d%%), #Int=%3d, #Iso=%3d\n";
static const char *format_device1 =
/* D: Ver=xx.xx Cls=xx(sssss) Sub=xx Prot=xx MxPS=dd #Cfgs=dd */
"D: Ver=%2x.%02x Cls=%02x(%-5s) Sub=%02x Prot=%02x MxPS=%2d #Cfgs=%3d\n";
static const char *format_device2 =
/* P: Vendor=xxxx ProdID=xxxx Rev=xx.xx */
"P: Vendor=%04x ProdID=%04x Rev=%2x.%02x\n";
static const char *format_config =
/* C: #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA */
"C:%c #Ifs=%2d Cfg#=%2d Atr=%02x MxPwr=%3dmA\n";
static const char *format_iad =
/* A: FirstIf#=dd IfCount=dd Cls=xx(sssss) Sub=xx Prot=xx */
"A: FirstIf#=%2d IfCount=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x\n";
static const char *format_iface =
/* I: If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=xxxx*/
"I:%c If#=%2d Alt=%2d #EPs=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x Driver=%s\n";
static const char *format_endpt =
/* E: Ad=xx(s) Atr=xx(ssss) MxPS=dddd Ivl=D?s */
"E: Ad=%02x(%c) Atr=%02x(%-4s) MxPS=%4d Ivl=%d%cs\n";
/*
* Need access to the driver and USB bus lists.
* extern struct list_head usb_bus_list;
* However, these will come from functions that return ptrs to each of them.
*/
/*
* Wait for an connect/disconnect event to happen. We initialize
* the event counter with an odd number, and each event will increment
* the event counter by two, so it will always _stay_ odd. That means
* that it will never be zero, so "event 0" will never match a current
* event, and thus 'poll' will always trigger as readable for the first
* time it gets called.
*/
static struct device_connect_event {
atomic_t count;
wait_queue_head_t wait;
} device_event = {
.count = ATOMIC_INIT(1),
.wait = __WAIT_QUEUE_HEAD_INITIALIZER(device_event.wait)
};
struct class_info {
int class;
char *class_name;
};
static const struct class_info clas_info[] = {
/* max. 5 chars. per name string */
{USB_CLASS_PER_INTERFACE, ">ifc"},
{USB_CLASS_AUDIO, "audio"},
{USB_CLASS_COMM, "comm."},
{USB_CLASS_HID, "HID"},
{USB_CLASS_PHYSICAL, "PID"},
{USB_CLASS_STILL_IMAGE, "still"},
{USB_CLASS_PRINTER, "print"},
{USB_CLASS_MASS_STORAGE, "stor."},
{USB_CLASS_HUB, "hub"},
{USB_CLASS_CDC_DATA, "data"},
{USB_CLASS_CSCID, "scard"},
{USB_CLASS_CONTENT_SEC, "c-sec"},
{USB_CLASS_VIDEO, "video"},
{USB_CLASS_WIRELESS_CONTROLLER, "wlcon"},
{USB_CLASS_MISC, "misc"},
{USB_CLASS_APP_SPEC, "app."},
{USB_CLASS_VENDOR_SPEC, "vend."},
{-1, "unk."} /* leave as last */
};
/*****************************************************************/
void usbfs_conn_disc_event(void)
{
atomic_add(2, &device_event.count);
wake_up(&device_event.wait);
}
static const char *class_decode(const int class)
{
int ix;
for (ix = 0; clas_info[ix].class != -1; ix++)
if (clas_info[ix].class == class)
break;
return clas_info[ix].class_name;
}
static char *usb_dump_endpoint_descriptor(int speed, char *start, char *end,
const struct usb_endpoint_descriptor *desc)
{
char dir, unit, *type;
unsigned interval, bandwidth = 1;
if (start > end)
return start;
dir = usb_endpoint_dir_in(desc) ? 'I' : 'O';
if (speed == USB_SPEED_HIGH) {
switch (le16_to_cpu(desc->wMaxPacketSize) & (0x03 << 11)) {
case 1 << 11:
bandwidth = 2; break;
case 2 << 11:
bandwidth = 3; break;
}
}
/* this isn't checking for illegal values */
switch (usb_endpoint_type(desc)) {
case USB_ENDPOINT_XFER_CONTROL:
type = "Ctrl";
if (speed == USB_SPEED_HIGH) /* uframes per NAK */
interval = desc->bInterval;
else
interval = 0;
dir = 'B'; /* ctrl is bidirectional */
break;
case USB_ENDPOINT_XFER_ISOC:
type = "Isoc";
interval = 1 << (desc->bInterval - 1);
break;
case USB_ENDPOINT_XFER_BULK:
type = "Bulk";
if (speed == USB_SPEED_HIGH && dir == 'O') /* uframes per NAK */
interval = desc->bInterval;
else
interval = 0;
break;
case USB_ENDPOINT_XFER_INT:
type = "Int.";
if (speed == USB_SPEED_HIGH || speed == USB_SPEED_SUPER)
interval = 1 << (desc->bInterval - 1);
else
interval = desc->bInterval;
break;
default: /* "can't happen" */
return start;
}
interval *= (speed == USB_SPEED_HIGH ||
speed == USB_SPEED_SUPER) ? 125 : 1000;
if (interval % 1000)
unit = 'u';
else {
unit = 'm';
interval /= 1000;
}
start += sprintf(start, format_endpt, desc->bEndpointAddress, dir,
desc->bmAttributes, type,
(le16_to_cpu(desc->wMaxPacketSize) & 0x07ff) *
bandwidth,
interval, unit);
return start;
}
static char *usb_dump_interface_descriptor(char *start, char *end,
const struct usb_interface_cache *intfc,
const struct usb_interface *iface,
int setno)
{
const struct usb_interface_descriptor *desc;
const char *driver_name = "";
int active = 0;
if (start > end)
return start;
desc = &intfc->altsetting[setno].desc;
if (iface) {
driver_name = (iface->dev.driver
? iface->dev.driver->name
: "(none)");
active = (desc == &iface->cur_altsetting->desc);
}
start += sprintf(start, format_iface,
active ? '*' : ' ', /* mark active altsetting */
desc->bInterfaceNumber,
desc->bAlternateSetting,
desc->bNumEndpoints,
desc->bInterfaceClass,
class_decode(desc->bInterfaceClass),
desc->bInterfaceSubClass,
desc->bInterfaceProtocol,
driver_name);
return start;
}
static char *usb_dump_interface(int speed, char *start, char *end,
const struct usb_interface_cache *intfc,
const struct usb_interface *iface, int setno)
{
const struct usb_host_interface *desc = &intfc->altsetting[setno];
int i;
start = usb_dump_interface_descriptor(start, end, intfc, iface, setno);
for (i = 0; i < desc->desc.bNumEndpoints; i++) {
if (start > end)
return start;
start = usb_dump_endpoint_descriptor(speed,
start, end, &desc->endpoint[i].desc);
}
return start;
}
static char *usb_dump_iad_descriptor(char *start, char *end,
const struct usb_interface_assoc_descriptor *iad)
{
if (start > end)
return start;
start += sprintf(start, format_iad,
iad->bFirstInterface,
iad->bInterfaceCount,
iad->bFunctionClass,
class_decode(iad->bFunctionClass),
iad->bFunctionSubClass,
iad->bFunctionProtocol);
return start;
}
/* TBD:
* 0. TBDs
* 1. marking active interface altsettings (code lists all, but should mark
* which ones are active, if any)
*/
static char *usb_dump_config_descriptor(char *start, char *end,
const struct usb_config_descriptor *desc,
int active)
{
if (start > end)
return start;
start += sprintf(start, format_config,
/* mark active/actual/current cfg. */
active ? '*' : ' ',
desc->bNumInterfaces,
desc->bConfigurationValue,
desc->bmAttributes,
desc->bMaxPower * 2);
return start;
}
static char *usb_dump_config(int speed, char *start, char *end,
const struct usb_host_config *config, int active)
{
int i, j;
struct usb_interface_cache *intfc;
struct usb_interface *interface;
if (start > end)
return start;
if (!config)
/* getting these some in 2.3.7; none in 2.3.6 */
return start + sprintf(start, "(null Cfg. desc.)\n");
start = usb_dump_config_descriptor(start, end, &config->desc, active);
for (i = 0; i < USB_MAXIADS; i++) {
if (config->intf_assoc[i] == NULL)
break;
start = usb_dump_iad_descriptor(start, end,
config->intf_assoc[i]);
}
for (i = 0; i < config->desc.bNumInterfaces; i++) {
intfc = config->intf_cache[i];
interface = config->interface[i];
for (j = 0; j < intfc->num_altsetting; j++) {
if (start > end)
return start;
start = usb_dump_interface(speed,
start, end, intfc, interface, j);
}
}
return start;
}
/*
* Dump the different USB descriptors.
*/
static char *usb_dump_device_descriptor(char *start, char *end,
const struct usb_device_descriptor *desc)
{
u16 bcdUSB = le16_to_cpu(desc->bcdUSB);
u16 bcdDevice = le16_to_cpu(desc->bcdDevice);
if (start > end)
return start;
start += sprintf(start, format_device1,
bcdUSB >> 8, bcdUSB & 0xff,
desc->bDeviceClass,
class_decode(desc->bDeviceClass),
desc->bDeviceSubClass,
desc->bDeviceProtocol,
desc->bMaxPacketSize0,
desc->bNumConfigurations);
if (start > end)
return start;
start += sprintf(start, format_device2,
le16_to_cpu(desc->idVendor),
le16_to_cpu(desc->idProduct),
bcdDevice >> 8, bcdDevice & 0xff);
return start;
}
/*
* Dump the different strings that this device holds.
*/
static char *usb_dump_device_strings(char *start, char *end,
struct usb_device *dev)
{
if (start > end)
return start;
if (dev->manufacturer)
start += sprintf(start, format_string_manufacturer,
dev->manufacturer);
if (start > end)
goto out;
if (dev->product)
start += sprintf(start, format_string_product, dev->product);
if (start > end)
goto out;
#ifdef ALLOW_SERIAL_NUMBER
if (dev->serial)
start += sprintf(start, format_string_serialnumber,
dev->serial);
#endif
out:
return start;
}
static char *usb_dump_desc(char *start, char *end, struct usb_device *dev)
{
int i;
if (start > end)
return start;
start = usb_dump_device_descriptor(start, end, &dev->descriptor);
if (start > end)
return start;
start = usb_dump_device_strings(start, end, dev);
for (i = 0; i < dev->descriptor.bNumConfigurations; i++) {
if (start > end)
return start;
start = usb_dump_config(dev->speed,
start, end, dev->config + i,
/* active ? */
(dev->config + i) == dev->actconfig);
}
return start;
}
#ifdef PROC_EXTRA /* TBD: may want to add this code later */
static char *usb_dump_hub_descriptor(char *start, char *end,
const struct usb_hub_descriptor *desc)
{
int leng = USB_DT_HUB_NONVAR_SIZE;
unsigned char *ptr = (unsigned char *)desc;
if (start > end)
return start;
start += sprintf(start, "Interface:");
while (leng && start <= end) {
start += sprintf(start, " %02x", *ptr);
ptr++; leng--;
}
*start++ = '\n';
return start;
}
static char *usb_dump_string(char *start, char *end,
const struct usb_device *dev, char *id, int index)
{
if (start > end)
return start;
start += sprintf(start, "Interface:");
if (index <= dev->maxstring && dev->stringindex &&
dev->stringindex[index])
start += sprintf(start, "%s: %.100s ", id,
dev->stringindex[index]);
return start;
}
#endif /* PROC_EXTRA */
/*****************************************************************/
/* This is a recursive function. Parameters:
* buffer - the user-space buffer to write data into
* nbytes - the maximum number of bytes to write
* skip_bytes - the number of bytes to skip before writing anything
* file_offset - the offset into the devices file on completion
* The caller must own the device lock.
*/
static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes,
loff_t *skip_bytes, loff_t *file_offset,
struct usb_device *usbdev, struct usb_bus *bus,
int level, int index, int count)
{
int chix;
int ret, cnt = 0;
int parent_devnum = 0;
char *pages_start, *data_end, *speed;
unsigned int length;
ssize_t total_written = 0;
/* don't bother with anything else if we're not writing any data */
if (*nbytes <= 0)
return 0;
if (level > MAX_TOPO_LEVEL)
return 0;
/* allocate 2^1 pages = 8K (on i386);
* should be more than enough for one device */
pages_start = (char *)__get_free_pages(GFP_NOIO, 1);
if (!pages_start)
return -ENOMEM;
if (usbdev->parent && usbdev->parent->devnum != -1)
parent_devnum = usbdev->parent->devnum;
/*
* So the root hub's parent is 0 and any device that is
* plugged into the root hub has a parent of 0.
*/
switch (usbdev->speed) {
case USB_SPEED_LOW:
speed = "1.5"; break;
case USB_SPEED_UNKNOWN: /* usb 1.1 root hub code */
case USB_SPEED_FULL:
speed = "12"; break;
case USB_SPEED_WIRELESS: /* Wireless has no real fixed speed */
case USB_SPEED_HIGH:
speed = "480"; break;
case USB_SPEED_SUPER:
speed = "5000"; break;
default:
speed = "??";
}
data_end = pages_start + sprintf(pages_start, format_topo,
bus->busnum, level, parent_devnum,
index, count, usbdev->devnum,
speed, usbdev->maxchild);
/*
* level = topology-tier level;
* parent_devnum = parent device number;
* index = parent's connector number;
* count = device count at this level
*/
/* If this is the root hub, display the bandwidth information */
if (level == 0) {
int max;
/* super/high speed reserves 80%, full/low reserves 90% */
if (usbdev->speed == USB_SPEED_HIGH ||
usbdev->speed == USB_SPEED_SUPER)
max = 800;
else
max = FRAME_TIME_MAX_USECS_ALLOC;
/* report "average" periodic allocation over a microsecond.
* the schedules are actually bursty, HCDs need to deal with
* that and just compute/report this average.
*/
data_end += sprintf(data_end, format_bandwidth,
bus->bandwidth_allocated, max,
(100 * bus->bandwidth_allocated + max / 2)
/ max,
bus->bandwidth_int_reqs,
bus->bandwidth_isoc_reqs);
}
data_end = usb_dump_desc(data_end, pages_start + (2 * PAGE_SIZE) - 256,
usbdev);
if (data_end > (pages_start + (2 * PAGE_SIZE) - 256))
data_end += sprintf(data_end, "(truncated)\n");
length = data_end - pages_start;
/* if we can start copying some data to the user */
if (length > *skip_bytes) {
length -= *skip_bytes;
if (length > *nbytes)
length = *nbytes;
if (copy_to_user(*buffer, pages_start + *skip_bytes, length)) {
free_pages((unsigned long)pages_start, 1);
return -EFAULT;
}
*nbytes -= length;
*file_offset += length;
total_written += length;
*buffer += length;
*skip_bytes = 0;
} else
*skip_bytes -= length;
free_pages((unsigned long)pages_start, 1);
/* Now look at all of this device's children. */
for (chix = 0; chix < usbdev->maxchild; chix++) {
struct usb_device *childdev = usbdev->children[chix];
if (childdev) {
usb_lock_device(childdev);
ret = usb_device_dump(buffer, nbytes, skip_bytes,
file_offset, childdev, bus,
level + 1, chix, ++cnt);
usb_unlock_device(childdev);
if (ret == -EFAULT)
return total_written;
total_written += ret;
}
}
return total_written;
}
static ssize_t usb_device_read(struct file *file, char __user *buf,
size_t nbytes, loff_t *ppos)
{
struct usb_bus *bus;
ssize_t ret, total_written = 0;
loff_t skip_bytes = *ppos;
if (*ppos < 0)
return -EINVAL;
if (nbytes <= 0)
return 0;
if (!access_ok(VERIFY_WRITE, buf, nbytes))
return -EFAULT;
mutex_lock(&usb_bus_list_lock);
/* print devices for all busses */
list_for_each_entry(bus, &usb_bus_list, bus_list) {
/* recurse through all children of the root hub */
if (!bus->root_hub)
continue;
usb_lock_device(bus->root_hub);
ret = usb_device_dump(&buf, &nbytes, &skip_bytes, ppos,
bus->root_hub, bus, 0, 0, 0);
usb_unlock_device(bus->root_hub);
if (ret < 0) {
mutex_unlock(&usb_bus_list_lock);
return ret;
}
total_written += ret;
}
mutex_unlock(&usb_bus_list_lock);
return total_written;
}
/* Kernel lock for "lastev" protection */
static unsigned int usb_device_poll(struct file *file,
struct poll_table_struct *wait)
{
unsigned int event_count;
poll_wait(file, &device_event.wait, wait);
event_count = atomic_read(&device_event.count);
if (file->f_version != event_count) {
file->f_version = event_count;
return POLLIN | POLLRDNORM;
}
return 0;
}
static loff_t usb_device_lseek(struct file *file, loff_t offset, int orig)
{
loff_t ret;
mutex_lock(&file->f_dentry->d_inode->i_mutex);
switch (orig) {
case 0:
file->f_pos = offset;
ret = file->f_pos;
break;
case 1:
file->f_pos += offset;
ret = file->f_pos;
break;
case 2:
default:
ret = -EINVAL;
}
mutex_unlock(&file->f_dentry->d_inode->i_mutex);
return ret;
}
const struct file_operations usbfs_devices_fops = {
.llseek = usb_device_lseek,
.read = usb_device_read,
.poll = usb_device_poll,
};