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hid-core.c
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hid-core.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* USB HID support for Linux
*
* Copyright (c) 1999 Andreas Gal
* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
* Copyright (c) 2007-2008 Oliver Neukum
* Copyright (c) 2006-2010 Jiri Kosina
*/
/*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <asm/unaligned.h>
#include <asm/byteorder.h>
#include <linux/input.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/string.h>
#include <linux/usb.h>
#include <linux/hid.h>
#include <linux/hiddev.h>
#include <linux/hid-debug.h>
#include <linux/hidraw.h>
#include "usbhid.h"
/*
* Version Information
*/
#define DRIVER_DESC "USB HID core driver"
/*
* Module parameters.
*/
static unsigned int hid_mousepoll_interval;
module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
MODULE_PARM_DESC(mousepoll, "Polling interval of mice");
static unsigned int hid_jspoll_interval;
module_param_named(jspoll, hid_jspoll_interval, uint, 0644);
MODULE_PARM_DESC(jspoll, "Polling interval of joysticks");
static unsigned int hid_kbpoll_interval;
module_param_named(kbpoll, hid_kbpoll_interval, uint, 0644);
MODULE_PARM_DESC(kbpoll, "Polling interval of keyboards");
static unsigned int ignoreled;
module_param_named(ignoreled, ignoreled, uint, 0644);
MODULE_PARM_DESC(ignoreled, "Autosuspend with active leds");
/* Quirks specified at module load time */
static char *quirks_param[MAX_USBHID_BOOT_QUIRKS];
module_param_array_named(quirks, quirks_param, charp, NULL, 0444);
MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying "
" quirks=vendorID:productID:quirks"
" where vendorID, productID, and quirks are all in"
" 0x-prefixed hex");
/*
* Input submission and I/O error handler.
*/
static void hid_io_error(struct hid_device *hid);
static int hid_submit_out(struct hid_device *hid);
static int hid_submit_ctrl(struct hid_device *hid);
static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid);
/* Start up the input URB */
static int hid_start_in(struct hid_device *hid)
{
unsigned long flags;
int rc = 0;
struct usbhid_device *usbhid = hid->driver_data;
spin_lock_irqsave(&usbhid->lock, flags);
if (test_bit(HID_IN_POLLING, &usbhid->iofl) &&
!test_bit(HID_DISCONNECTED, &usbhid->iofl) &&
!test_bit(HID_SUSPENDED, &usbhid->iofl) &&
!test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) {
rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC);
if (rc != 0) {
clear_bit(HID_IN_RUNNING, &usbhid->iofl);
if (rc == -ENOSPC)
set_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
} else {
clear_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
}
}
spin_unlock_irqrestore(&usbhid->lock, flags);
return rc;
}
/* I/O retry timer routine */
static void hid_retry_timeout(struct timer_list *t)
{
struct usbhid_device *usbhid = from_timer(usbhid, t, io_retry);
struct hid_device *hid = usbhid->hid;
dev_dbg(&usbhid->intf->dev, "retrying intr urb\n");
if (hid_start_in(hid))
hid_io_error(hid);
}
/* Workqueue routine to reset the device or clear a halt */
static void hid_reset(struct work_struct *work)
{
struct usbhid_device *usbhid =
container_of(work, struct usbhid_device, reset_work);
struct hid_device *hid = usbhid->hid;
int rc;
if (test_bit(HID_CLEAR_HALT, &usbhid->iofl)) {
dev_dbg(&usbhid->intf->dev, "clear halt\n");
rc = usb_clear_halt(hid_to_usb_dev(hid), usbhid->urbin->pipe);
clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
if (rc == 0) {
hid_start_in(hid);
} else {
dev_dbg(&usbhid->intf->dev,
"clear-halt failed: %d\n", rc);
set_bit(HID_RESET_PENDING, &usbhid->iofl);
}
}
if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) {
dev_dbg(&usbhid->intf->dev, "resetting device\n");
usb_queue_reset_device(usbhid->intf);
}
}
/* Main I/O error handler */
static void hid_io_error(struct hid_device *hid)
{
unsigned long flags;
struct usbhid_device *usbhid = hid->driver_data;
spin_lock_irqsave(&usbhid->lock, flags);
/* Stop when disconnected */
if (test_bit(HID_DISCONNECTED, &usbhid->iofl))
goto done;
/* If it has been a while since the last error, we'll assume
* this a brand new error and reset the retry timeout. */
if (time_after(jiffies, usbhid->stop_retry + HZ/2))
usbhid->retry_delay = 0;
/* When an error occurs, retry at increasing intervals */
if (usbhid->retry_delay == 0) {
usbhid->retry_delay = 13; /* Then 26, 52, 104, 104, ... */
usbhid->stop_retry = jiffies + msecs_to_jiffies(1000);
} else if (usbhid->retry_delay < 100)
usbhid->retry_delay *= 2;
if (time_after(jiffies, usbhid->stop_retry)) {
/* Retries failed, so do a port reset unless we lack bandwidth*/
if (!test_bit(HID_NO_BANDWIDTH, &usbhid->iofl)
&& !test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
schedule_work(&usbhid->reset_work);
goto done;
}
}
mod_timer(&usbhid->io_retry,
jiffies + msecs_to_jiffies(usbhid->retry_delay));
done:
spin_unlock_irqrestore(&usbhid->lock, flags);
}
static void usbhid_mark_busy(struct usbhid_device *usbhid)
{
struct usb_interface *intf = usbhid->intf;
usb_mark_last_busy(interface_to_usbdev(intf));
}
static int usbhid_restart_out_queue(struct usbhid_device *usbhid)
{
struct hid_device *hid = usb_get_intfdata(usbhid->intf);
int kicked;
int r;
if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
test_bit(HID_SUSPENDED, &usbhid->iofl))
return 0;
if ((kicked = (usbhid->outhead != usbhid->outtail))) {
hid_dbg(hid, "Kicking head %d tail %d", usbhid->outhead, usbhid->outtail);
/* Try to wake up from autosuspend... */
r = usb_autopm_get_interface_async(usbhid->intf);
if (r < 0)
return r;
/*
* If still suspended, don't submit. Submission will
* occur if/when resume drains the queue.
*/
if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
usb_autopm_put_interface_no_suspend(usbhid->intf);
return r;
}
/* Asynchronously flush queue. */
set_bit(HID_OUT_RUNNING, &usbhid->iofl);
if (hid_submit_out(hid)) {
clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
usb_autopm_put_interface_async(usbhid->intf);
}
wake_up(&usbhid->wait);
}
return kicked;
}
static int usbhid_restart_ctrl_queue(struct usbhid_device *usbhid)
{
struct hid_device *hid = usb_get_intfdata(usbhid->intf);
int kicked;
int r;
WARN_ON(hid == NULL);
if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
test_bit(HID_SUSPENDED, &usbhid->iofl))
return 0;
if ((kicked = (usbhid->ctrlhead != usbhid->ctrltail))) {
hid_dbg(hid, "Kicking head %d tail %d", usbhid->ctrlhead, usbhid->ctrltail);
/* Try to wake up from autosuspend... */
r = usb_autopm_get_interface_async(usbhid->intf);
if (r < 0)
return r;
/*
* If still suspended, don't submit. Submission will
* occur if/when resume drains the queue.
*/
if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
usb_autopm_put_interface_no_suspend(usbhid->intf);
return r;
}
/* Asynchronously flush queue. */
set_bit(HID_CTRL_RUNNING, &usbhid->iofl);
if (hid_submit_ctrl(hid)) {
clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
usb_autopm_put_interface_async(usbhid->intf);
}
wake_up(&usbhid->wait);
}
return kicked;
}
/*
* Input interrupt completion handler.
*/
static void hid_irq_in(struct urb *urb)
{
struct hid_device *hid = urb->context;
struct usbhid_device *usbhid = hid->driver_data;
int status;
switch (urb->status) {
case 0: /* success */
usbhid->retry_delay = 0;
if (!test_bit(HID_OPENED, &usbhid->iofl))
break;
usbhid_mark_busy(usbhid);
if (!test_bit(HID_RESUME_RUNNING, &usbhid->iofl)) {
hid_input_report(urb->context, HID_INPUT_REPORT,
urb->transfer_buffer,
urb->actual_length, 1);
/*
* autosuspend refused while keys are pressed
* because most keyboards don't wake up when
* a key is released
*/
if (hid_check_keys_pressed(hid))
set_bit(HID_KEYS_PRESSED, &usbhid->iofl);
else
clear_bit(HID_KEYS_PRESSED, &usbhid->iofl);
}
break;
case -EPIPE: /* stall */
usbhid_mark_busy(usbhid);
clear_bit(HID_IN_RUNNING, &usbhid->iofl);
set_bit(HID_CLEAR_HALT, &usbhid->iofl);
schedule_work(&usbhid->reset_work);
return;
case -ECONNRESET: /* unlink */
case -ENOENT:
case -ESHUTDOWN: /* unplug */
clear_bit(HID_IN_RUNNING, &usbhid->iofl);
return;
case -EILSEQ: /* protocol error or unplug */
case -EPROTO: /* protocol error or unplug */
case -ETIME: /* protocol error or unplug */
case -ETIMEDOUT: /* Should never happen, but... */
usbhid_mark_busy(usbhid);
clear_bit(HID_IN_RUNNING, &usbhid->iofl);
hid_io_error(hid);
return;
default: /* error */
hid_warn(urb->dev, "input irq status %d received\n",
urb->status);
}
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status) {
clear_bit(HID_IN_RUNNING, &usbhid->iofl);
if (status != -EPERM) {
hid_err(hid, "can't resubmit intr, %s-%s/input%d, status %d\n",
hid_to_usb_dev(hid)->bus->bus_name,
hid_to_usb_dev(hid)->devpath,
usbhid->ifnum, status);
hid_io_error(hid);
}
}
}
static int hid_submit_out(struct hid_device *hid)
{
struct hid_report *report;
char *raw_report;
struct usbhid_device *usbhid = hid->driver_data;
int r;
report = usbhid->out[usbhid->outtail].report;
raw_report = usbhid->out[usbhid->outtail].raw_report;
usbhid->urbout->transfer_buffer_length = hid_report_len(report);
usbhid->urbout->dev = hid_to_usb_dev(hid);
if (raw_report) {
memcpy(usbhid->outbuf, raw_report,
usbhid->urbout->transfer_buffer_length);
kfree(raw_report);
usbhid->out[usbhid->outtail].raw_report = NULL;
}
dbg_hid("submitting out urb\n");
r = usb_submit_urb(usbhid->urbout, GFP_ATOMIC);
if (r < 0) {
hid_err(hid, "usb_submit_urb(out) failed: %d\n", r);
return r;
}
usbhid->last_out = jiffies;
return 0;
}
static int hid_submit_ctrl(struct hid_device *hid)
{
struct hid_report *report;
unsigned char dir;
char *raw_report;
int len, r;
struct usbhid_device *usbhid = hid->driver_data;
report = usbhid->ctrl[usbhid->ctrltail].report;
raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;
dir = usbhid->ctrl[usbhid->ctrltail].dir;
len = hid_report_len(report);
if (dir == USB_DIR_OUT) {
usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
if (raw_report) {
memcpy(usbhid->ctrlbuf, raw_report, len);
kfree(raw_report);
usbhid->ctrl[usbhid->ctrltail].raw_report = NULL;
}
} else {
int maxpacket;
usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
maxpacket = usb_maxpacket(hid_to_usb_dev(hid),
usbhid->urbctrl->pipe, 0);
if (maxpacket > 0) {
len += (len == 0); /* Don't allow 0-length reports */
len = DIV_ROUND_UP(len, maxpacket);
len *= maxpacket;
if (len > usbhid->bufsize)
len = usbhid->bufsize;
} else
len = 0;
}
usbhid->urbctrl->transfer_buffer_length = len;
usbhid->urbctrl->dev = hid_to_usb_dev(hid);
usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT :
HID_REQ_GET_REPORT;
usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) |
report->id);
usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
usbhid->cr->wLength = cpu_to_le16(len);
dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n",
usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" :
"Get_Report",
usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);
r = usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC);
if (r < 0) {
hid_err(hid, "usb_submit_urb(ctrl) failed: %d\n", r);
return r;
}
usbhid->last_ctrl = jiffies;
return 0;
}
/*
* Output interrupt completion handler.
*/
static void hid_irq_out(struct urb *urb)
{
struct hid_device *hid = urb->context;
struct usbhid_device *usbhid = hid->driver_data;
unsigned long flags;
int unplug = 0;
switch (urb->status) {
case 0: /* success */
break;
case -ESHUTDOWN: /* unplug */
unplug = 1;
break;
case -EILSEQ: /* protocol error or unplug */
case -EPROTO: /* protocol error or unplug */
case -ECONNRESET: /* unlink */
case -ENOENT:
break;
default: /* error */
hid_warn(urb->dev, "output irq status %d received\n",
urb->status);
}
spin_lock_irqsave(&usbhid->lock, flags);
if (unplug) {
usbhid->outtail = usbhid->outhead;
} else {
usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1);
if (usbhid->outhead != usbhid->outtail &&
hid_submit_out(hid) == 0) {
/* Successfully submitted next urb in queue */
spin_unlock_irqrestore(&usbhid->lock, flags);
return;
}
}
clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
spin_unlock_irqrestore(&usbhid->lock, flags);
usb_autopm_put_interface_async(usbhid->intf);
wake_up(&usbhid->wait);
}
/*
* Control pipe completion handler.
*/
static void hid_ctrl(struct urb *urb)
{
struct hid_device *hid = urb->context;
struct usbhid_device *usbhid = hid->driver_data;
unsigned long flags;
int unplug = 0, status = urb->status;
switch (status) {
case 0: /* success */
if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN)
hid_input_report(urb->context,
usbhid->ctrl[usbhid->ctrltail].report->type,
urb->transfer_buffer, urb->actual_length, 0);
break;
case -ESHUTDOWN: /* unplug */
unplug = 1;
break;
case -EILSEQ: /* protocol error or unplug */
case -EPROTO: /* protocol error or unplug */
case -ECONNRESET: /* unlink */
case -ENOENT:
case -EPIPE: /* report not available */
break;
default: /* error */
hid_warn(urb->dev, "ctrl urb status %d received\n", status);
}
spin_lock_irqsave(&usbhid->lock, flags);
if (unplug) {
usbhid->ctrltail = usbhid->ctrlhead;
} else if (usbhid->ctrlhead != usbhid->ctrltail) {
usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
if (usbhid->ctrlhead != usbhid->ctrltail &&
hid_submit_ctrl(hid) == 0) {
/* Successfully submitted next urb in queue */
spin_unlock_irqrestore(&usbhid->lock, flags);
return;
}
}
clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
spin_unlock_irqrestore(&usbhid->lock, flags);
usb_autopm_put_interface_async(usbhid->intf);
wake_up(&usbhid->wait);
}
static void __usbhid_submit_report(struct hid_device *hid, struct hid_report *report,
unsigned char dir)
{
int head;
struct usbhid_device *usbhid = hid->driver_data;
if (((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN) ||
test_bit(HID_DISCONNECTED, &usbhid->iofl))
return;
if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {
if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) {
hid_warn(hid, "output queue full\n");
return;
}
usbhid->out[usbhid->outhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
if (!usbhid->out[usbhid->outhead].raw_report) {
hid_warn(hid, "output queueing failed\n");
return;
}
hid_output_report(report, usbhid->out[usbhid->outhead].raw_report);
usbhid->out[usbhid->outhead].report = report;
usbhid->outhead = head;
/* If the queue isn't running, restart it */
if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl)) {
usbhid_restart_out_queue(usbhid);
/* Otherwise see if an earlier request has timed out */
} else if (time_after(jiffies, usbhid->last_out + HZ * 5)) {
/* Prevent autosuspend following the unlink */
usb_autopm_get_interface_no_resume(usbhid->intf);
/*
* Prevent resubmission in case the URB completes
* before we can unlink it. We don't want to cancel
* the wrong transfer!
*/
usb_block_urb(usbhid->urbout);
/* Drop lock to avoid deadlock if the callback runs */
spin_unlock(&usbhid->lock);
usb_unlink_urb(usbhid->urbout);
spin_lock(&usbhid->lock);
usb_unblock_urb(usbhid->urbout);
/* Unlink might have stopped the queue */
if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl))
usbhid_restart_out_queue(usbhid);
/* Now we can allow autosuspend again */
usb_autopm_put_interface_async(usbhid->intf);
}
return;
}
if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
hid_warn(hid, "control queue full\n");
return;
}
if (dir == USB_DIR_OUT) {
usbhid->ctrl[usbhid->ctrlhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) {
hid_warn(hid, "control queueing failed\n");
return;
}
hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report);
}
usbhid->ctrl[usbhid->ctrlhead].report = report;
usbhid->ctrl[usbhid->ctrlhead].dir = dir;
usbhid->ctrlhead = head;
/* If the queue isn't running, restart it */
if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) {
usbhid_restart_ctrl_queue(usbhid);
/* Otherwise see if an earlier request has timed out */
} else if (time_after(jiffies, usbhid->last_ctrl + HZ * 5)) {
/* Prevent autosuspend following the unlink */
usb_autopm_get_interface_no_resume(usbhid->intf);
/*
* Prevent resubmission in case the URB completes
* before we can unlink it. We don't want to cancel
* the wrong transfer!
*/
usb_block_urb(usbhid->urbctrl);
/* Drop lock to avoid deadlock if the callback runs */
spin_unlock(&usbhid->lock);
usb_unlink_urb(usbhid->urbctrl);
spin_lock(&usbhid->lock);
usb_unblock_urb(usbhid->urbctrl);
/* Unlink might have stopped the queue */
if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
usbhid_restart_ctrl_queue(usbhid);
/* Now we can allow autosuspend again */
usb_autopm_put_interface_async(usbhid->intf);
}
}
static void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
{
struct usbhid_device *usbhid = hid->driver_data;
unsigned long flags;
spin_lock_irqsave(&usbhid->lock, flags);
__usbhid_submit_report(hid, report, dir);
spin_unlock_irqrestore(&usbhid->lock, flags);
}
static int usbhid_wait_io(struct hid_device *hid)
{
struct usbhid_device *usbhid = hid->driver_data;
if (!wait_event_timeout(usbhid->wait,
(!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
!test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
10*HZ)) {
dbg_hid("timeout waiting for ctrl or out queue to clear\n");
return -1;
}
return 0;
}
static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
{
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report,
ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
}
static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
unsigned char type, void *buf, int size)
{
int result, retries = 4;
memset(buf, 0, size);
do {
result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
(type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT);
retries--;
} while (result < size && retries);
return result;
}
static int usbhid_open(struct hid_device *hid)
{
struct usbhid_device *usbhid = hid->driver_data;
int res;
mutex_lock(&usbhid->mutex);
set_bit(HID_OPENED, &usbhid->iofl);
if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
res = 0;
goto Done;
}
res = usb_autopm_get_interface(usbhid->intf);
/* the device must be awake to reliably request remote wakeup */
if (res < 0) {
clear_bit(HID_OPENED, &usbhid->iofl);
res = -EIO;
goto Done;
}
usbhid->intf->needs_remote_wakeup = 1;
set_bit(HID_RESUME_RUNNING, &usbhid->iofl);
set_bit(HID_IN_POLLING, &usbhid->iofl);
res = hid_start_in(hid);
if (res) {
if (res != -ENOSPC) {
hid_io_error(hid);
res = 0;
} else {
/* no use opening if resources are insufficient */
res = -EBUSY;
clear_bit(HID_OPENED, &usbhid->iofl);
clear_bit(HID_IN_POLLING, &usbhid->iofl);
usbhid->intf->needs_remote_wakeup = 0;
}
}
usb_autopm_put_interface(usbhid->intf);
/*
* In case events are generated while nobody was listening,
* some are released when the device is re-opened.
* Wait 50 msec for the queue to empty before allowing events
* to go through hid.
*/
if (res == 0)
msleep(50);
clear_bit(HID_RESUME_RUNNING, &usbhid->iofl);
Done:
mutex_unlock(&usbhid->mutex);
return res;
}
static void usbhid_close(struct hid_device *hid)
{
struct usbhid_device *usbhid = hid->driver_data;
mutex_lock(&usbhid->mutex);
/*
* Make sure we don't restart data acquisition due to
* a resumption we no longer care about by avoiding racing
* with hid_start_in().
*/
spin_lock_irq(&usbhid->lock);
clear_bit(HID_OPENED, &usbhid->iofl);
if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL))
clear_bit(HID_IN_POLLING, &usbhid->iofl);
spin_unlock_irq(&usbhid->lock);
if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL)) {
hid_cancel_delayed_stuff(usbhid);
usb_kill_urb(usbhid->urbin);
usbhid->intf->needs_remote_wakeup = 0;
}
mutex_unlock(&usbhid->mutex);
}
/*
* Initialize all reports
*/
void usbhid_init_reports(struct hid_device *hid)
{
struct hid_report *report;
struct usbhid_device *usbhid = hid->driver_data;
struct hid_report_enum *report_enum;
int err, ret;
report_enum = &hid->report_enum[HID_INPUT_REPORT];
list_for_each_entry(report, &report_enum->report_list, list)
usbhid_submit_report(hid, report, USB_DIR_IN);
report_enum = &hid->report_enum[HID_FEATURE_REPORT];
list_for_each_entry(report, &report_enum->report_list, list)
usbhid_submit_report(hid, report, USB_DIR_IN);
err = 0;
ret = usbhid_wait_io(hid);
while (ret) {
err |= ret;
if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
usb_kill_urb(usbhid->urbctrl);
if (test_bit(HID_OUT_RUNNING, &usbhid->iofl))
usb_kill_urb(usbhid->urbout);
ret = usbhid_wait_io(hid);
}
if (err)
hid_warn(hid, "timeout initializing reports\n");
}
/*
* Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
*/
static int hid_find_field_early(struct hid_device *hid, unsigned int page,
unsigned int hid_code, struct hid_field **pfield)
{
struct hid_report *report;
struct hid_field *field;
struct hid_usage *usage;
int i, j;
list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
for (i = 0; i < report->maxfield; i++) {
field = report->field[i];
for (j = 0; j < field->maxusage; j++) {
usage = &field->usage[j];
if ((usage->hid & HID_USAGE_PAGE) == page &&
(usage->hid & 0xFFFF) == hid_code) {
*pfield = field;
return j;
}
}
}
}
return -1;
}
static void usbhid_set_leds(struct hid_device *hid)
{
struct hid_field *field;
int offset;
if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) {
hid_set_field(field, offset, 0);
usbhid_submit_report(hid, field->report, USB_DIR_OUT);
}
}
/*
* Traverse the supplied list of reports and find the longest
*/
static void hid_find_max_report(struct hid_device *hid, unsigned int type,
unsigned int *max)
{
struct hid_report *report;
unsigned int size;
list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
size = ((report->size - 1) >> 3) + 1 + hid->report_enum[type].numbered;
if (*max < size)
*max = size;
}
}
static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
{
struct usbhid_device *usbhid = hid->driver_data;
usbhid->inbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
&usbhid->inbuf_dma);
usbhid->outbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
&usbhid->outbuf_dma);
usbhid->cr = kmalloc(sizeof(*usbhid->cr), GFP_KERNEL);
usbhid->ctrlbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
&usbhid->ctrlbuf_dma);
if (!usbhid->inbuf || !usbhid->outbuf || !usbhid->cr ||
!usbhid->ctrlbuf)
return -1;
return 0;
}
static int usbhid_get_raw_report(struct hid_device *hid,
unsigned char report_number, __u8 *buf, size_t count,
unsigned char report_type)
{
struct usbhid_device *usbhid = hid->driver_data;
struct usb_device *dev = hid_to_usb_dev(hid);
struct usb_interface *intf = usbhid->intf;
struct usb_host_interface *interface = intf->cur_altsetting;
int skipped_report_id = 0;
int ret;
/* Byte 0 is the report number. Report data starts at byte 1.*/
buf[0] = report_number;
if (report_number == 0x0) {
/* Offset the return buffer by 1, so that the report ID
will remain in byte 0. */
buf++;
count--;
skipped_report_id = 1;
}
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
HID_REQ_GET_REPORT,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
((report_type + 1) << 8) | report_number,
interface->desc.bInterfaceNumber, buf, count,
USB_CTRL_SET_TIMEOUT);
/* count also the report id */
if (ret > 0 && skipped_report_id)
ret++;
return ret;
}
static int usbhid_set_raw_report(struct hid_device *hid, unsigned int reportnum,
__u8 *buf, size_t count, unsigned char rtype)
{
struct usbhid_device *usbhid = hid->driver_data;
struct usb_device *dev = hid_to_usb_dev(hid);
struct usb_interface *intf = usbhid->intf;
struct usb_host_interface *interface = intf->cur_altsetting;
int ret, skipped_report_id = 0;
/* Byte 0 is the report number. Report data starts at byte 1.*/
if ((rtype == HID_OUTPUT_REPORT) &&
(hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORT_ID))
buf[0] = 0;
else
buf[0] = reportnum;
if (buf[0] == 0x0) {
/* Don't send the Report ID */
buf++;
count--;
skipped_report_id = 1;
}
ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
HID_REQ_SET_REPORT,
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
((rtype + 1) << 8) | reportnum,
interface->desc.bInterfaceNumber, buf, count,
USB_CTRL_SET_TIMEOUT);
/* count also the report id, if this was a numbered report. */
if (ret > 0 && skipped_report_id)
ret++;
return ret;
}
static int usbhid_output_report(struct hid_device *hid, __u8 *buf, size_t count)
{
struct usbhid_device *usbhid = hid->driver_data;
struct usb_device *dev = hid_to_usb_dev(hid);
int actual_length, skipped_report_id = 0, ret;
if (!usbhid->urbout)
return -ENOSYS;
if (buf[0] == 0x0) {
/* Don't send the Report ID */
buf++;
count--;
skipped_report_id = 1;
}
ret = usb_interrupt_msg(dev, usbhid->urbout->pipe,
buf, count, &actual_length,
USB_CTRL_SET_TIMEOUT);
/* return the number of bytes transferred */
if (ret == 0) {
ret = actual_length;
/* count also the report id */
if (skipped_report_id)
ret++;
}
return ret;
}
static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
{
struct usbhid_device *usbhid = hid->driver_data;
usb_free_coherent(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
usb_free_coherent(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
kfree(usbhid->cr);
usb_free_coherent(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
}
static int usbhid_parse(struct hid_device *hid)
{
struct usb_interface *intf = to_usb_interface(hid->dev.parent);
struct usb_host_interface *interface = intf->cur_altsetting;
struct usb_device *dev = interface_to_usbdev (intf);
struct hid_descriptor *hdesc;
u32 quirks = 0;
unsigned int rsize = 0;
char *rdesc;
int ret, n;
int num_descriptors;
size_t offset = offsetof(struct hid_descriptor, desc);
quirks = hid_lookup_quirk(hid);
if (quirks & HID_QUIRK_IGNORE)
return -ENODEV;