drivers/hid/usbhid/hid-core.c

   1 /*
   2  *  USB HID support for Linux
   3  *
   4  *  Copyright (c) 1999 Andreas Gal
   5  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   6  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   7  *  Copyright (c) 2007-2008 Oliver Neukum
   8  *  Copyright (c) 2006-2010 Jiri Kosina
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 2 of the License, or (at your option)
  15  * any later version.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/list.h>
  23 #include <linux/mm.h>
  24 #include <linux/mutex.h>
  25 #include <linux/spinlock.h>
  26 #include <asm/unaligned.h>
  27 #include <asm/byteorder.h>
  28 #include <linux/input.h>
  29 #include <linux/wait.h>
  30 #include <linux/workqueue.h>
  31 #include <linux/string.h>
  32
  33 #include <linux/usb.h>
  34
  35 #include <linux/hid.h>
  36 #include <linux/hiddev.h>
  37 #include <linux/hid-debug.h>
  38 #include <linux/hidraw.h>
  39 #include "usbhid.h"
  40
  41 /*
  42  * Version Information
  43  */
  44
  45 #define DRIVER_DESC "USB HID core driver"
  46 #define DRIVER_LICENSE "GPL"
  47
  48 /*
  49  * Module parameters.
  50  */
  51
  52 static unsigned int hid_mousepoll_interval;
  53 module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
  54 MODULE_PARM_DESC(mousepoll, "Polling interval of mice");
  55
  56 static unsigned int ignoreled;
  57 module_param_named(ignoreled, ignoreled, uint, 0644);
  58 MODULE_PARM_DESC(ignoreled, "Autosuspend with active leds");
  59
  60 /* Quirks specified at module load time */
  61 static char *quirks_param[MAX_USBHID_BOOT_QUIRKS] = { [ 0 ... (MAX_USBHID_BOOT_QUIRKS - 1) ] = NULL };
  62 module_param_array_named(quirks, quirks_param, charp, NULL, 0444);
  63 MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying "
  64                 " quirks=vendorID:productID:quirks"
  65                 " where vendorID, productID, and quirks are all in"
  66                 " 0x-prefixed hex");
  67 /*
  68  * Input submission and I/O error handler.
  69  */
  70 static DEFINE_MUTEX(hid_open_mut);
  71
  72 static void hid_io_error(struct hid_device *hid);
  73 static int hid_submit_out(struct hid_device *hid);
  74 static int hid_submit_ctrl(struct hid_device *hid);
  75 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid);
  76
  77 /* Start up the input URB */
  78 static int hid_start_in(struct hid_device *hid)
  79 {
  80         unsigned long flags;
  81         int rc = 0;
  82         struct usbhid_device *usbhid = hid->driver_data;
  83
  84         spin_lock_irqsave(&usbhid->lock, flags);
  85         if (hid->open > 0 &&
  86                         !test_bit(HID_DISCONNECTED, &usbhid->iofl) &&
  87                         !test_bit(HID_SUSPENDED, &usbhid->iofl) &&
  88                         !test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) {
  89                 rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC);
  90                 if (rc != 0) {
  91                         clear_bit(HID_IN_RUNNING, &usbhid->iofl);
  92                         if (rc == -ENOSPC)
  93                                 set_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
  94                 } else {
  95                         clear_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
  96                 }
  97         }
  98         spin_unlock_irqrestore(&usbhid->lock, flags);
  99         return rc;
 100 }
 101
 102 /* I/O retry timer routine */
 103 static void hid_retry_timeout(unsigned long _hid)
 104 {
 105         struct hid_device *hid = (struct hid_device *) _hid;
 106         struct usbhid_device *usbhid = hid->driver_data;
 107
 108         dev_dbg(&usbhid->intf->dev, "retrying intr urb\n");
 109         if (hid_start_in(hid))
 110                 hid_io_error(hid);
 111 }
 112
 113 /* Workqueue routine to reset the device or clear a halt */
 114 static void hid_reset(struct work_struct *work)
 115 {
 116         struct usbhid_device *usbhid =
 117                 container_of(work, struct usbhid_device, reset_work);
 118         struct hid_device *hid = usbhid->hid;
 119         int rc = 0;
 120
 121         if (test_bit(HID_CLEAR_HALT, &usbhid->iofl)) {
 122                 dev_dbg(&usbhid->intf->dev, "clear halt\n");
 123                 rc = usb_clear_halt(hid_to_usb_dev(hid), usbhid->urbin->pipe);
 124                 clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
 125                 hid_start_in(hid);
 126         }
 127
 128         else if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) {
 129                 dev_dbg(&usbhid->intf->dev, "resetting device\n");
 130                 rc = usb_lock_device_for_reset(hid_to_usb_dev(hid), usbhid->intf);
 131                 if (rc == 0) {
 132                         rc = usb_reset_device(hid_to_usb_dev(hid));
 133                         usb_unlock_device(hid_to_usb_dev(hid));
 134                 }
 135                 clear_bit(HID_RESET_PENDING, &usbhid->iofl);
 136         }
 137
 138         switch (rc) {
 139         case 0:
 140                 if (!test_bit(HID_IN_RUNNING, &usbhid->iofl))
 141                         hid_io_error(hid);
 142                 break;
 143         default:
 144                 hid_err(hid, "can't reset device, %s-%s/input%d, status %d\n",
 145                         hid_to_usb_dev(hid)->bus->bus_name,
 146                         hid_to_usb_dev(hid)->devpath,
 147                         usbhid->ifnum, rc);
 148                 /* FALLTHROUGH */
 149         case -EHOSTUNREACH:
 150         case -ENODEV:
 151         case -EINTR:
 152                 break;
 153         }
 154 }
 155
 156 /* Main I/O error handler */
 157 static void hid_io_error(struct hid_device *hid)
 158 {
 159         unsigned long flags;
 160         struct usbhid_device *usbhid = hid->driver_data;
 161
 162         spin_lock_irqsave(&usbhid->lock, flags);
 163
 164         /* Stop when disconnected */
 165         if (test_bit(HID_DISCONNECTED, &usbhid->iofl))
 166                 goto done;
 167
 168         /* If it has been a while since the last error, we'll assume
 169          * this a brand new error and reset the retry timeout. */
 170         if (time_after(jiffies, usbhid->stop_retry + HZ/2))
 171                 usbhid->retry_delay = 0;
 172
 173         /* When an error occurs, retry at increasing intervals */
 174         if (usbhid->retry_delay == 0) {
 175                 usbhid->retry_delay = 13;       /* Then 26, 52, 104, 104, ... */
 176                 usbhid->stop_retry = jiffies + msecs_to_jiffies(1000);
 177         } else if (usbhid->retry_delay < 100)
 178                 usbhid->retry_delay *= 2;
 179
 180         if (time_after(jiffies, usbhid->stop_retry)) {
 181
 182                 /* Retries failed, so do a port reset unless we lack bandwidth*/
 183                 if (test_bit(HID_NO_BANDWIDTH, &usbhid->iofl)
 184                      && !test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
 185
 186                         schedule_work(&usbhid->reset_work);
 187                         goto done;
 188                 }
 189         }
 190
 191         mod_timer(&usbhid->io_retry,
 192                         jiffies + msecs_to_jiffies(usbhid->retry_delay));
 193 done:
 194         spin_unlock_irqrestore(&usbhid->lock, flags);
 195 }
 196
 197 static void usbhid_mark_busy(struct usbhid_device *usbhid)
 198 {
 199         struct usb_interface *intf = usbhid->intf;
 200
 201         usb_mark_last_busy(interface_to_usbdev(intf));
 202 }
 203
 204 static int usbhid_restart_out_queue(struct usbhid_device *usbhid)
 205 {
 206         struct hid_device *hid = usb_get_intfdata(usbhid->intf);
 207         int kicked;
 208         int r;
 209
 210         if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
 211                         test_bit(HID_SUSPENDED, &usbhid->iofl))
 212                 return 0;
 213
 214         if ((kicked = (usbhid->outhead != usbhid->outtail))) {
 215                 hid_dbg(hid, "Kicking head %d tail %d", usbhid->outhead, usbhid->outtail);
 216
 217                 /* Try to wake up from autosuspend... */
 218                 r = usb_autopm_get_interface_async(usbhid->intf);
 219                 if (r < 0)
 220                         return r;
 221
 222                 /*
 223                  * If still suspended, don't submit.  Submission will
 224                  * occur if/when resume drains the queue.
 225                  */
 226                 if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
 227                         usb_autopm_put_interface_no_suspend(usbhid->intf);
 228                         return r;
 229                 }
 230
 231                 /* Asynchronously flush queue. */
 232                 set_bit(HID_OUT_RUNNING, &usbhid->iofl);
 233                 if (hid_submit_out(hid)) {
 234                         clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
 235                         usb_autopm_put_interface_async(usbhid->intf);
 236                 }
 237                 wake_up(&usbhid->wait);
 238         }
 239         return kicked;
 240 }
 241
 242 static int usbhid_restart_ctrl_queue(struct usbhid_device *usbhid)
 243 {
 244         struct hid_device *hid = usb_get_intfdata(usbhid->intf);
 245         int kicked;
 246         int r;
 247
 248         WARN_ON(hid == NULL);
 249         if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
 250                         test_bit(HID_SUSPENDED, &usbhid->iofl))
 251                 return 0;
 252
 253         if ((kicked = (usbhid->ctrlhead != usbhid->ctrltail))) {
 254                 hid_dbg(hid, "Kicking head %d tail %d", usbhid->ctrlhead, usbhid->ctrltail);
 255
 256                 /* Try to wake up from autosuspend... */
 257                 r = usb_autopm_get_interface_async(usbhid->intf);
 258                 if (r < 0)
 259                         return r;
 260
 261                 /*
 262                  * If still suspended, don't submit.  Submission will
 263                  * occur if/when resume drains the queue.
 264                  */
 265                 if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
 266                         usb_autopm_put_interface_no_suspend(usbhid->intf);
 267                         return r;
 268                 }
 269
 270                 /* Asynchronously flush queue. */
 271                 set_bit(HID_CTRL_RUNNING, &usbhid->iofl);
 272                 if (hid_submit_ctrl(hid)) {
 273                         clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
 274                         usb_autopm_put_interface_async(usbhid->intf);
 275                 }
 276                 wake_up(&usbhid->wait);
 277         }
 278         return kicked;
 279 }
 280
 281 /*
 282  * Input interrupt completion handler.
 283  */
 284
 285 static void hid_irq_in(struct urb *urb)
 286 {
 287         struct hid_device       *hid = urb->context;
 288         struct usbhid_device    *usbhid = hid->driver_data;
 289         int                     status;
 290
 291         switch (urb->status) {
 292         case 0:                 /* success */
 293                 usbhid_mark_busy(usbhid);
 294                 usbhid->retry_delay = 0;
 295                 hid_input_report(urb->context, HID_INPUT_REPORT,
 296                                  urb->transfer_buffer,
 297                                  urb->actual_length, 1);
 298                 /*
 299                  * autosuspend refused while keys are pressed
 300                  * because most keyboards don't wake up when
 301                  * a key is released
 302                  */
 303                 if (hid_check_keys_pressed(hid))
 304                         set_bit(HID_KEYS_PRESSED, &usbhid->iofl);
 305                 else
 306                         clear_bit(HID_KEYS_PRESSED, &usbhid->iofl);
 307                 break;
 308         case -EPIPE:            /* stall */
 309                 usbhid_mark_busy(usbhid);
 310                 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
 311                 set_bit(HID_CLEAR_HALT, &usbhid->iofl);
 312                 schedule_work(&usbhid->reset_work);
 313                 return;
 314         case -ECONNRESET:       /* unlink */
 315         case -ENOENT:
 316         case -ESHUTDOWN:        /* unplug */
 317                 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
 318                 return;
 319         case -EILSEQ:           /* protocol error or unplug */
 320         case -EPROTO:           /* protocol error or unplug */
 321         case -ETIME:            /* protocol error or unplug */
 322         case -ETIMEDOUT:        /* Should never happen, but... */
 323                 usbhid_mark_busy(usbhid);
 324                 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
 325                 hid_io_error(hid);
 326                 return;
 327         default:                /* error */
 328                 hid_warn(urb->dev, "input irq status %d received\n",
 329                          urb->status);
 330         }
 331
 332         status = usb_submit_urb(urb, GFP_ATOMIC);
 333         if (status) {
 334                 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
 335                 if (status != -EPERM) {
 336                         hid_err(hid, "can't resubmit intr, %s-%s/input%d, status %d\n",
 337                                 hid_to_usb_dev(hid)->bus->bus_name,
 338                                 hid_to_usb_dev(hid)->devpath,
 339                                 usbhid->ifnum, status);
 340                         hid_io_error(hid);
 341                 }
 342         }
 343 }
 344
 345 static int hid_submit_out(struct hid_device *hid)
 346 {
 347         struct hid_report *report;
 348         char *raw_report;
 349         struct usbhid_device *usbhid = hid->driver_data;
 350         int r;
 351
 352         report = usbhid->out[usbhid->outtail].report;
 353         raw_report = usbhid->out[usbhid->outtail].raw_report;
 354
 355         usbhid->urbout->transfer_buffer_length = ((report->size - 1) >> 3) +
 356                                                  1 + (report->id > 0);
 357         usbhid->urbout->dev = hid_to_usb_dev(hid);
 358         if (raw_report) {
 359                 memcpy(usbhid->outbuf, raw_report,
 360                                 usbhid->urbout->transfer_buffer_length);
 361                 kfree(raw_report);
 362                 usbhid->out[usbhid->outtail].raw_report = NULL;
 363         }
 364
 365         dbg_hid("submitting out urb\n");
 366
 367         r = usb_submit_urb(usbhid->urbout, GFP_ATOMIC);
 368         if (r < 0) {
 369                 hid_err(hid, "usb_submit_urb(out) failed: %d\n", r);
 370                 return r;
 371         }
 372         usbhid->last_out = jiffies;
 373         return 0;
 374 }
 375
 376 static int hid_submit_ctrl(struct hid_device *hid)
 377 {
 378         struct hid_report *report;
 379         unsigned char dir;
 380         char *raw_report;
 381         int len, r;
 382         struct usbhid_device *usbhid = hid->driver_data;
 383
 384         report = usbhid->ctrl[usbhid->ctrltail].report;
 385         raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;
 386         dir = usbhid->ctrl[usbhid->ctrltail].dir;
 387
 388         len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
 389         if (dir == USB_DIR_OUT) {
 390                 usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
 391                 usbhid->urbctrl->transfer_buffer_length = len;
 392                 if (raw_report) {
 393                         memcpy(usbhid->ctrlbuf, raw_report, len);
 394                         kfree(raw_report);
 395                         usbhid->ctrl[usbhid->ctrltail].raw_report = NULL;
 396                 }
 397         } else {
 398                 int maxpacket, padlen;
 399
 400                 usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
 401                 maxpacket = usb_maxpacket(hid_to_usb_dev(hid),
 402                                           usbhid->urbctrl->pipe, 0);
 403                 if (maxpacket > 0) {
 404                         padlen = DIV_ROUND_UP(len, maxpacket);
 405                         padlen *= maxpacket;
 406                         if (padlen > usbhid->bufsize)
 407                                 padlen = usbhid->bufsize;
 408                 } else
 409                         padlen = 0;
 410                 usbhid->urbctrl->transfer_buffer_length = padlen;
 411         }
 412         usbhid->urbctrl->dev = hid_to_usb_dev(hid);
 413
 414         usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
 415         usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT :
 416                                                       HID_REQ_GET_REPORT;
 417         usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) |
 418                                          report->id);
 419         usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
 420         usbhid->cr->wLength = cpu_to_le16(len);
 421
 422         dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n",
 423                 usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" :
 424                                                              "Get_Report",
 425                 usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);
 426
 427         r = usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC);
 428         if (r < 0) {
 429                 hid_err(hid, "usb_submit_urb(ctrl) failed: %d\n", r);
 430                 return r;
 431         }
 432         usbhid->last_ctrl = jiffies;
 433         return 0;
 434 }
 435
 436 /*
 437  * Output interrupt completion handler.
 438  */
 439
 440 static void hid_irq_out(struct urb *urb)
 441 {
 442         struct hid_device *hid = urb->context;
 443         struct usbhid_device *usbhid = hid->driver_data;
 444         unsigned long flags;
 445         int unplug = 0;
 446
 447         switch (urb->status) {
 448         case 0:                 /* success */
 449                 break;
 450         case -ESHUTDOWN:        /* unplug */
 451                 unplug = 1;
 452         case -EILSEQ:           /* protocol error or unplug */
 453         case -EPROTO:           /* protocol error or unplug */
 454         case -ECONNRESET:       /* unlink */
 455         case -ENOENT:
 456                 break;
 457         default:                /* error */
 458                 hid_warn(urb->dev, "output irq status %d received\n",
 459                          urb->status);
 460         }
 461
 462         spin_lock_irqsave(&usbhid->lock, flags);
 463
 464         if (unplug) {
 465                 usbhid->outtail = usbhid->outhead;
 466         } else {
 467                 usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1);
 468
 469                 if (usbhid->outhead != usbhid->outtail &&
 470                                 hid_submit_out(hid) == 0) {
 471                         /* Successfully submitted next urb in queue */
 472                         spin_unlock_irqrestore(&usbhid->lock, flags);
 473                         return;
 474                 }
 475         }
 476
 477         clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
 478         spin_unlock_irqrestore(&usbhid->lock, flags);
 479         usb_autopm_put_interface_async(usbhid->intf);
 480         wake_up(&usbhid->wait);
 481 }
 482
 483 /*
 484  * Control pipe completion handler.
 485  */
 486
 487 static void hid_ctrl(struct urb *urb)
 488 {
 489         struct hid_device *hid = urb->context;
 490         struct usbhid_device *usbhid = hid->driver_data;
 491         int unplug = 0, status = urb->status;
 492
 493         spin_lock(&usbhid->lock);
 494
 495         switch (status) {
 496         case 0:                 /* success */
 497                 if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN)
 498                         hid_input_report(urb->context,
 499                                 usbhid->ctrl[usbhid->ctrltail].report->type,
 500                                 urb->transfer_buffer, urb->actual_length, 0);
 501                 break;
 502         case -ESHUTDOWN:        /* unplug */
 503                 unplug = 1;
 504         case -EILSEQ:           /* protocol error or unplug */
 505         case -EPROTO:           /* protocol error or unplug */
 506         case -ECONNRESET:       /* unlink */
 507         case -ENOENT:
 508         case -EPIPE:            /* report not available */
 509                 break;
 510         default:                /* error */
 511                 hid_warn(urb->dev, "ctrl urb status %d received\n", status);
 512         }
 513
 514         if (unplug) {
 515                 usbhid->ctrltail = usbhid->ctrlhead;
 516         } else {
 517                 usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
 518
 519                 if (usbhid->ctrlhead != usbhid->ctrltail &&
 520                                 hid_submit_ctrl(hid) == 0) {
 521                         /* Successfully submitted next urb in queue */
 522                         spin_unlock(&usbhid->lock);
 523                         return;
 524                 }
 525         }
 526
 527         clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
 528         spin_unlock(&usbhid->lock);
 529         usb_autopm_put_interface_async(usbhid->intf);
 530         wake_up(&usbhid->wait);
 531 }
 532
 533 static void __usbhid_submit_report(struct hid_device *hid, struct hid_report *report,
 534                                    unsigned char dir)
 535 {
 536         int head;
 537         struct usbhid_device *usbhid = hid->driver_data;
 538
 539         if ((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN)
 540                 return;
 541
 542         if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {
 543                 if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) {
 544                         hid_warn(hid, "output queue full\n");
 545                         return;
 546                 }
 547
 548                 usbhid->out[usbhid->outhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
 549                 if (!usbhid->out[usbhid->outhead].raw_report) {
 550                         hid_warn(hid, "output queueing failed\n");
 551                         return;
 552                 }
 553                 hid_output_report(report, usbhid->out[usbhid->outhead].raw_report);
 554                 usbhid->out[usbhid->outhead].report = report;
 555                 usbhid->outhead = head;
 556
 557                 /* If the queue isn't running, restart it */
 558                 if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl)) {
 559                         usbhid_restart_out_queue(usbhid);
 560
 561                 /* Otherwise see if an earlier request has timed out */
 562                 } else if (time_after(jiffies, usbhid->last_out + HZ * 5)) {
 563
 564                         /* Prevent autosuspend following the unlink */
 565                         usb_autopm_get_interface_no_resume(usbhid->intf);
 566
 567                         /*
 568                          * Prevent resubmission in case the URB completes
 569                          * before we can unlink it.  We don't want to cancel
 570                          * the wrong transfer!
 571                          */
 572                         usb_block_urb(usbhid->urbout);
 573
 574                         /* Drop lock to avoid deadlock if the callback runs */
 575                         spin_unlock(&usbhid->lock);
 576
 577                         usb_unlink_urb(usbhid->urbout);
 578                         spin_lock(&usbhid->lock);
 579                         usb_unblock_urb(usbhid->urbout);
 580
 581                         /* Unlink might have stopped the queue */
 582                         if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl))
 583                                 usbhid_restart_out_queue(usbhid);
 584
 585                         /* Now we can allow autosuspend again */
 586                         usb_autopm_put_interface_async(usbhid->intf);
 587                 }
 588                 return;
 589         }
 590
 591         if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
 592                 hid_warn(hid, "control queue full\n");
 593                 return;
 594         }
 595
 596         if (dir == USB_DIR_OUT) {
 597                 usbhid->ctrl[usbhid->ctrlhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
 598                 if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) {
 599                         hid_warn(hid, "control queueing failed\n");
 600                         return;
 601                 }
 602                 hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report);
 603         }
 604         usbhid->ctrl[usbhid->ctrlhead].report = report;
 605         usbhid->ctrl[usbhid->ctrlhead].dir = dir;
 606         usbhid->ctrlhead = head;
 607
 608         /* If the queue isn't running, restart it */
 609         if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) {
 610                 usbhid_restart_ctrl_queue(usbhid);
 611
 612         /* Otherwise see if an earlier request has timed out */
 613         } else if (time_after(jiffies, usbhid->last_ctrl + HZ * 5)) {
 614
 615                 /* Prevent autosuspend following the unlink */
 616                 usb_autopm_get_interface_no_resume(usbhid->intf);
 617
 618                 /*
 619                  * Prevent resubmission in case the URB completes
 620                  * before we can unlink it.  We don't want to cancel
 621                  * the wrong transfer!
 622                  */
 623                 usb_block_urb(usbhid->urbctrl);
 624
 625                 /* Drop lock to avoid deadlock if the callback runs */
 626                 spin_unlock(&usbhid->lock);
 627
 628                 usb_unlink_urb(usbhid->urbctrl);
 629                 spin_lock(&usbhid->lock);
 630                 usb_unblock_urb(usbhid->urbctrl);
 631
 632                 /* Unlink might have stopped the queue */
 633                 if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
 634                         usbhid_restart_ctrl_queue(usbhid);
 635
 636                 /* Now we can allow autosuspend again */
 637                 usb_autopm_put_interface_async(usbhid->intf);
 638         }
 639 }
 640
 641 static void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
 642 {
 643         struct usbhid_device *usbhid = hid->driver_data;
 644         unsigned long flags;
 645
 646         spin_lock_irqsave(&usbhid->lock, flags);
 647         __usbhid_submit_report(hid, report, dir);
 648         spin_unlock_irqrestore(&usbhid->lock, flags);
 649 }
 650
 651 static int usbhid_wait_io(struct hid_device *hid)
 652 {
 653         struct usbhid_device *usbhid = hid->driver_data;
 654
 655         if (!wait_event_timeout(usbhid->wait,
 656                                 (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
 657                                 !test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
 658                                         10*HZ)) {
 659                 dbg_hid("timeout waiting for ctrl or out queue to clear\n");
 660                 return -1;
 661         }
 662
 663         return 0;
 664 }
 665
 666 static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
 667 {
 668         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 669                 HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report,
 670                 ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
 671 }
 672
 673 static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
 674                 unsigned char type, void *buf, int size)
 675 {
 676         int result, retries = 4;
 677
 678         memset(buf, 0, size);
 679
 680         do {
 681                 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 682                                 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
 683                                 (type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT);
 684                 retries--;
 685         } while (result < size && retries);
 686         return result;
 687 }
 688
 689 int usbhid_open(struct hid_device *hid)
 690 {
 691         struct usbhid_device *usbhid = hid->driver_data;
 692         int res = 0;
 693
 694         mutex_lock(&hid_open_mut);
 695         if (!hid->open++) {
 696                 res = usb_autopm_get_interface(usbhid->intf);
 697                 /* the device must be awake to reliably request remote wakeup */
 698                 if (res < 0) {
 699                         hid->open--;
 700                         res = -EIO;
 701                         goto done;
 702                 }
 703                 usbhid->intf->needs_remote_wakeup = 1;
 704                 res = hid_start_in(hid);
 705                 if (res) {
 706                         if (res != -ENOSPC) {
 707                                 hid_io_error(hid);
 708                                 res = 0;
 709                         } else {
 710                                 /* no use opening if resources are insufficient */
 711                                 hid->open--;
 712                                 res = -EBUSY;
 713                                 usbhid->intf->needs_remote_wakeup = 0;
 714                         }
 715                 }
 716                 usb_autopm_put_interface(usbhid->intf);
 717         }
 718 done:
 719         mutex_unlock(&hid_open_mut);
 720         return res;
 721 }
 722
 723 void usbhid_close(struct hid_device *hid)
 724 {
 725         struct usbhid_device *usbhid = hid->driver_data;
 726
 727         mutex_lock(&hid_open_mut);
 728
 729         /* protecting hid->open to make sure we don't restart
 730          * data acquistion due to a resumption we no longer
 731          * care about
 732          */
 733         spin_lock_irq(&usbhid->lock);
 734         if (!--hid->open) {
 735                 spin_unlock_irq(&usbhid->lock);
 736                 hid_cancel_delayed_stuff(usbhid);
 737                 usb_kill_urb(usbhid->urbin);
 738                 usbhid->intf->needs_remote_wakeup = 0;
 739         } else {
 740                 spin_unlock_irq(&usbhid->lock);
 741         }
 742         mutex_unlock(&hid_open_mut);
 743 }
 744
 745 /*
 746  * Initialize all reports
 747  */
 748
 749 void usbhid_init_reports(struct hid_device *hid)
 750 {
 751         struct hid_report *report;
 752         struct usbhid_device *usbhid = hid->driver_data;
 753         int err, ret;
 754
 755         list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].report_list, list)
 756                 usbhid_submit_report(hid, report, USB_DIR_IN);
 757
 758         list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].report_list, list)
 759                 usbhid_submit_report(hid, report, USB_DIR_IN);
 760
 761         err = 0;
 762         ret = usbhid_wait_io(hid);
 763         while (ret) {
 764                 err |= ret;
 765                 if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
 766                         usb_kill_urb(usbhid->urbctrl);
 767                 if (test_bit(HID_OUT_RUNNING, &usbhid->iofl))
 768                         usb_kill_urb(usbhid->urbout);
 769                 ret = usbhid_wait_io(hid);
 770         }
 771
 772         if (err)
 773                 hid_warn(hid, "timeout initializing reports\n");
 774 }
 775
 776 /*
 777  * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
 778  */
 779 static int hid_find_field_early(struct hid_device *hid, unsigned int page,
 780     unsigned int hid_code, struct hid_field **pfield)
 781 {
 782         struct hid_report *report;
 783         struct hid_field *field;
 784         struct hid_usage *usage;
 785         int i, j;
 786
 787         list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
 788                 for (i = 0; i < report->maxfield; i++) {
 789                         field = report->field[i];
 790                         for (j = 0; j < field->maxusage; j++) {
 791                                 usage = &field->usage[j];
 792                                 if ((usage->hid & HID_USAGE_PAGE) == page &&
 793                                     (usage->hid & 0xFFFF) == hid_code) {
 794                                         *pfield = field;
 795                                         return j;
 796                                 }
 797                         }
 798                 }
 799         }
 800         return -1;
 801 }
 802
 803 static void usbhid_set_leds(struct hid_device *hid)
 804 {
 805         struct hid_field *field;
 806         int offset;
 807
 808         if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) {
 809                 hid_set_field(field, offset, 0);
 810                 usbhid_submit_report(hid, field->report, USB_DIR_OUT);
 811         }
 812 }
 813
 814 /*
 815  * Traverse the supplied list of reports and find the longest
 816  */
 817 static void hid_find_max_report(struct hid_device *hid, unsigned int type,
 818                 unsigned int *max)
 819 {
 820         struct hid_report *report;
 821         unsigned int size;
 822
 823         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
 824                 size = ((report->size - 1) >> 3) + 1 + hid->report_enum[type].numbered;
 825                 if (*max < size)
 826                         *max = size;
 827         }
 828 }
 829
 830 static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
 831 {
 832         struct usbhid_device *usbhid = hid->driver_data;
 833
 834         usbhid->inbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
 835                         &usbhid->inbuf_dma);
 836         usbhid->outbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
 837                         &usbhid->outbuf_dma);
 838         usbhid->cr = kmalloc(sizeof(*usbhid->cr), GFP_KERNEL);
 839         usbhid->ctrlbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
 840                         &usbhid->ctrlbuf_dma);
 841         if (!usbhid->inbuf || !usbhid->outbuf || !usbhid->cr ||
 842                         !usbhid->ctrlbuf)
 843                 return -1;
 844
 845         return 0;
 846 }
 847
 848 static int usbhid_get_raw_report(struct hid_device *hid,
 849                 unsigned char report_number, __u8 *buf, size_t count,
 850                 unsigned char report_type)
 851 {
 852         struct usbhid_device *usbhid = hid->driver_data;
 853         struct usb_device *dev = hid_to_usb_dev(hid);
 854         struct usb_interface *intf = usbhid->intf;
 855         struct usb_host_interface *interface = intf->cur_altsetting;
 856         int skipped_report_id = 0;
 857         int ret;
 858
 859         /* Byte 0 is the report number. Report data starts at byte 1.*/
 860         buf[0] = report_number;
 861         if (report_number == 0x0) {
 862                 /* Offset the return buffer by 1, so that the report ID
 863                    will remain in byte 0. */
 864                 buf++;
 865                 count--;
 866                 skipped_report_id = 1;
 867         }
 868         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 869                 HID_REQ_GET_REPORT,
 870                 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 871                 ((report_type + 1) << 8) | report_number,
 872                 interface->desc.bInterfaceNumber, buf, count,
 873                 USB_CTRL_SET_TIMEOUT);
 874
 875         /* count also the report id */
 876         if (ret > 0 && skipped_report_id)
 877                 ret++;
 878
 879         return ret;
 880 }
 881
 882 static int usbhid_output_raw_report(struct hid_device *hid, __u8 *buf, size_t count,
 883                 unsigned char report_type)
 884 {
 885         struct usbhid_device *usbhid = hid->driver_data;
 886         struct usb_device *dev = hid_to_usb_dev(hid);
 887         struct usb_interface *intf = usbhid->intf;
 888         struct usb_host_interface *interface = intf->cur_altsetting;
 889         int ret;
 890
 891         if (usbhid->urbout && report_type != HID_FEATURE_REPORT) {
 892                 int actual_length;
 893                 int skipped_report_id = 0;
 894
 895                 if (buf[0] == 0x0) {
 896                         /* Don't send the Report ID */
 897                         buf++;
 898                         count--;
 899                         skipped_report_id = 1;
 900                 }
 901                 ret = usb_interrupt_msg(dev, usbhid->urbout->pipe,
 902                         buf, count, &actual_length,
 903                         USB_CTRL_SET_TIMEOUT);
 904                 /* return the number of bytes transferred */
 905                 if (ret == 0) {
 906                         ret = actual_length;
 907                         /* count also the report id */
 908                         if (skipped_report_id)
 909                                 ret++;
 910                 }
 911         } else {
 912                 int skipped_report_id = 0;
 913                 int report_id = buf[0];
 914                 if (buf[0] == 0x0) {
 915                         /* Don't send the Report ID */
 916                         buf++;
 917                         count--;
 918                         skipped_report_id = 1;
 919                 }
 920                 ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 921                         HID_REQ_SET_REPORT,
 922                         USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 923                         ((report_type + 1) << 8) | report_id,
 924                         interface->desc.bInterfaceNumber, buf, count,
 925                         USB_CTRL_SET_TIMEOUT);
 926                 /* count also the report id, if this was a numbered report. */
 927                 if (ret > 0 && skipped_report_id)
 928                         ret++;
 929         }
 930
 931         return ret;
 932 }
 933
 934 static void usbhid_restart_queues(struct usbhid_device *usbhid)
 935 {
 936         if (usbhid->urbout && !test_bit(HID_OUT_RUNNING, &usbhid->iofl))
 937                 usbhid_restart_out_queue(usbhid);
 938         if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
 939                 usbhid_restart_ctrl_queue(usbhid);
 940 }
 941
 942 static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
 943 {
 944         struct usbhid_device *usbhid = hid->driver_data;
 945
 946         usb_free_coherent(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
 947         usb_free_coherent(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
 948         kfree(usbhid->cr);
 949         usb_free_coherent(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
 950 }
 951
 952 static int usbhid_parse(struct hid_device *hid)
 953 {
 954         struct usb_interface *intf = to_usb_interface(hid->dev.parent);
 955         struct usb_host_interface *interface = intf->cur_altsetting;
 956         struct usb_device *dev = interface_to_usbdev (intf);
 957         struct hid_descriptor *hdesc;
 958         u32 quirks = 0;
 959         unsigned int rsize = 0;
 960         char *rdesc;
 961         int ret, n;
 962
 963         quirks = usbhid_lookup_quirk(le16_to_cpu(dev->descriptor.idVendor),
 964                         le16_to_cpu(dev->descriptor.idProduct));
 965
 966         if (quirks & HID_QUIRK_IGNORE)
 967                 return -ENODEV;
 968
 969         /* Many keyboards and mice don't like to be polled for reports,
 970          * so we will always set the HID_QUIRK_NOGET flag for them. */
 971         if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
 972                 if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD ||
 973                         interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE)
 974                                 quirks |= HID_QUIRK_NOGET;
 975         }
 976
 977         if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) &&
 978             (!interface->desc.bNumEndpoints ||
 979              usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) {
 980                 dbg_hid("class descriptor not present\n");
 981                 return -ENODEV;
 982         }
 983
 984         hid->version = le16_to_cpu(hdesc->bcdHID);
 985         hid->country = hdesc->bCountryCode;
 986
 987         for (n = 0; n < hdesc->bNumDescriptors; n++)
 988                 if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT)
 989                         rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);
 990
 991         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
 992                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
 993                 return -EINVAL;
 994         }
 995
 996         if (!(rdesc = kmalloc(rsize, GFP_KERNEL))) {
 997                 dbg_hid("couldn't allocate rdesc memory\n");
 998                 return -ENOMEM;
 999         }
1000
1001         hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0);
1002
1003         ret = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber,
1004                         HID_DT_REPORT, rdesc, rsize);
1005         if (ret < 0) {
1006                 dbg_hid("reading report descriptor failed\n");
1007                 kfree(rdesc);
1008                 goto err;
1009         }
1010
1011         ret = hid_parse_report(hid, rdesc, rsize);
1012         kfree(rdesc);
1013         if (ret) {
1014                 dbg_hid("parsing report descriptor failed\n");
1015                 goto err;
1016         }
1017
1018         hid->quirks |= quirks;
1019
1020         return 0;
1021 err:
1022         return ret;
1023 }
1024
1025 static int usbhid_start(struct hid_device *hid)
1026 {
1027         struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1028         struct usb_host_interface *interface = intf->cur_altsetting;
1029         struct usb_device *dev = interface_to_usbdev(intf);
1030         struct usbhid_device *usbhid = hid->driver_data;
1031         unsigned int n, insize = 0;
1032         int ret;
1033
1034         clear_bit(HID_DISCONNECTED, &usbhid->iofl);
1035
1036         usbhid->bufsize = HID_MIN_BUFFER_SIZE;
1037         hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
1038         hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
1039         hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize);
1040
1041         if (usbhid->bufsize > HID_MAX_BUFFER_SIZE)
1042                 usbhid->bufsize = HID_MAX_BUFFER_SIZE;
1043
1044         hid_find_max_report(hid, HID_INPUT_REPORT, &insize);
1045
1046         if (insize > HID_MAX_BUFFER_SIZE)
1047                 insize = HID_MAX_BUFFER_SIZE;
1048
1049         if (hid_alloc_buffers(dev, hid)) {
1050                 ret = -ENOMEM;
1051                 goto fail;
1052         }
1053
1054         for (n = 0; n < interface->desc.bNumEndpoints; n++) {
1055                 struct usb_endpoint_descriptor *endpoint;
1056                 int pipe;
1057                 int interval;
1058
1059                 endpoint = &interface->endpoint[n].desc;
1060                 if (!usb_endpoint_xfer_int(endpoint))
1061                         continue;
1062
1063                 interval = endpoint->bInterval;
1064
1065                 /* Some vendors give fullspeed interval on highspeed devides */
1066                 if (hid->quirks & HID_QUIRK_FULLSPEED_INTERVAL &&
1067                     dev->speed == USB_SPEED_HIGH) {
1068                         interval = fls(endpoint->bInterval*8);
1069                         printk(KERN_INFO "%s: Fixing fullspeed to highspeed interval: %d -> %d\n",
1070                                hid->name, endpoint->bInterval, interval);
1071                 }
1072
1073                 /* Change the polling interval of mice. */
1074                 if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0)
1075                         interval = hid_mousepoll_interval;
1076
1077                 ret = -ENOMEM;
1078                 if (usb_endpoint_dir_in(endpoint)) {
1079                         if (usbhid->urbin)
1080                                 continue;
1081                         if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
1082                                 goto fail;
1083                         pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
1084                         usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize,
1085                                          hid_irq_in, hid, interval);
1086                         usbhid->urbin->transfer_dma = usbhid->inbuf_dma;
1087                         usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1088                 } else {
1089                         if (usbhid->urbout)
1090                                 continue;
1091                         if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
1092                                 goto fail;
1093                         pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress);
1094                         usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0,
1095                                          hid_irq_out, hid, interval);
1096                         usbhid->urbout->transfer_dma = usbhid->outbuf_dma;
1097                         usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1098                 }
1099         }
1100
1101         usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
1102         if (!usbhid->urbctrl) {
1103                 ret = -ENOMEM;
1104                 goto fail;
1105         }
1106
1107         usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr,
1108                              usbhid->ctrlbuf, 1, hid_ctrl, hid);
1109         usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
1110         usbhid->urbctrl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1111
1112         if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
1113                 usbhid_init_reports(hid);
1114
1115         set_bit(HID_STARTED, &usbhid->iofl);
1116
1117         /* Some keyboards don't work until their LEDs have been set.
1118          * Since BIOSes do set the LEDs, it must be safe for any device
1119          * that supports the keyboard boot protocol.
1120          * In addition, enable remote wakeup by default for all keyboard
1121          * devices supporting the boot protocol.
1122          */
1123         if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT &&
1124                         interface->desc.bInterfaceProtocol ==
1125                                 USB_INTERFACE_PROTOCOL_KEYBOARD) {
1126                 usbhid_set_leds(hid);
1127                 device_set_wakeup_enable(&dev->dev, 1);
1128         }
1129         return 0;
1130
1131 fail:
1132         usb_free_urb(usbhid->urbin);
1133         usb_free_urb(usbhid->urbout);
1134         usb_free_urb(usbhid->urbctrl);
1135         usbhid->urbin = NULL;
1136         usbhid->urbout = NULL;
1137         usbhid->urbctrl = NULL;
1138         hid_free_buffers(dev, hid);
1139         return ret;
1140 }
1141
1142 static void usbhid_stop(struct hid_device *hid)
1143 {
1144         struct usbhid_device *usbhid = hid->driver_data;
1145
1146         if (WARN_ON(!usbhid))
1147                 return;
1148
1149         clear_bit(HID_STARTED, &usbhid->iofl);
1150         spin_lock_irq(&usbhid->lock);   /* Sync with error and led handlers */
1151         set_bit(HID_DISCONNECTED, &usbhid->iofl);
1152         spin_unlock_irq(&usbhid->lock);
1153         usb_kill_urb(usbhid->urbin);
1154         usb_kill_urb(usbhid->urbout);
1155         usb_kill_urb(usbhid->urbctrl);
1156
1157         hid_cancel_delayed_stuff(usbhid);
1158
1159         hid->claimed = 0;
1160
1161         usb_free_urb(usbhid->urbin);
1162         usb_free_urb(usbhid->urbctrl);
1163         usb_free_urb(usbhid->urbout);
1164         usbhid->urbin = NULL; /* don't mess up next start */
1165         usbhid->urbctrl = NULL;
1166         usbhid->urbout = NULL;
1167
1168         hid_free_buffers(hid_to_usb_dev(hid), hid);
1169 }
1170
1171 static int usbhid_power(struct hid_device *hid, int lvl)
1172 {
1173         int r = 0;
1174
1175         switch (lvl) {
1176         case PM_HINT_FULLON:
1177                 r = usbhid_get_power(hid);
1178                 break;
1179         case PM_HINT_NORMAL:
1180                 usbhid_put_power(hid);
1181                 break;
1182         }
1183         return r;
1184 }
1185
1186 static void usbhid_request(struct hid_device *hid, struct hid_report *rep, int reqtype)
1187 {
1188         switch (reqtype) {
1189         case HID_REQ_GET_REPORT:
1190                 usbhid_submit_report(hid, rep, USB_DIR_IN);
1191                 break;
1192         case HID_REQ_SET_REPORT:
1193                 usbhid_submit_report(hid, rep, USB_DIR_OUT);
1194                 break;
1195         }
1196 }
1197
1198 static int usbhid_idle(struct hid_device *hid, int report, int idle,
1199                 int reqtype)
1200 {
1201         struct usb_device *dev = hid_to_usb_dev(hid);
1202         struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1203         struct usb_host_interface *interface = intf->cur_altsetting;
1204         int ifnum = interface->desc.bInterfaceNumber;
1205
1206         if (reqtype != HID_REQ_SET_IDLE)
1207                 return -EINVAL;
1208
1209         return hid_set_idle(dev, ifnum, report, idle);
1210 }
1211
1212 static struct hid_ll_driver usb_hid_driver = {
1213         .parse = usbhid_parse,
1214         .start = usbhid_start,
1215         .stop = usbhid_stop,
1216         .open = usbhid_open,
1217         .close = usbhid_close,
1218         .power = usbhid_power,
1219         .request = usbhid_request,
1220         .wait = usbhid_wait_io,
1221         .idle = usbhid_idle,
1222 };
1223
1224 static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
1225 {
1226         struct usb_host_interface *interface = intf->cur_altsetting;
1227         struct usb_device *dev = interface_to_usbdev(intf);
1228         struct usbhid_device *usbhid;
1229         struct hid_device *hid;
1230         unsigned int n, has_in = 0;
1231         size_t len;
1232         int ret;
1233
1234         dbg_hid("HID probe called for ifnum %d\n",
1235                         intf->altsetting->desc.bInterfaceNumber);
1236
1237         for (n = 0; n < interface->desc.bNumEndpoints; n++)
1238                 if (usb_endpoint_is_int_in(&interface->endpoint[n].desc))
1239                         has_in++;
1240         if (!has_in) {
1241                 hid_err(intf, "couldn't find an input interrupt endpoint\n");
1242                 return -ENODEV;
1243         }
1244
1245         hid = hid_allocate_device();
1246         if (IS_ERR(hid))
1247                 return PTR_ERR(hid);
1248
1249         usb_set_intfdata(intf, hid);
1250         hid->ll_driver = &usb_hid_driver;
1251         hid->hid_get_raw_report = usbhid_get_raw_report;
1252         hid->hid_output_raw_report = usbhid_output_raw_report;
1253         hid->ff_init = hid_pidff_init;
1254 #ifdef CONFIG_USB_HIDDEV
1255         hid->hiddev_connect = hiddev_connect;
1256         hid->hiddev_disconnect = hiddev_disconnect;
1257         hid->hiddev_hid_event = hiddev_hid_event;
1258         hid->hiddev_report_event = hiddev_report_event;
1259 #endif
1260         hid->dev.parent = &intf->dev;
1261         hid->bus = BUS_USB;
1262         hid->vendor = le16_to_cpu(dev->descriptor.idVendor);
1263         hid->product = le16_to_cpu(dev->descriptor.idProduct);
1264         hid->name[0] = 0;
1265         hid->quirks = usbhid_lookup_quirk(hid->vendor, hid->product);
1266         if (intf->cur_altsetting->desc.bInterfaceProtocol ==
1267                         USB_INTERFACE_PROTOCOL_MOUSE)
1268                 hid->type = HID_TYPE_USBMOUSE;
1269         else if (intf->cur_altsetting->desc.bInterfaceProtocol == 0)
1270                 hid->type = HID_TYPE_USBNONE;
1271
1272         if (dev->manufacturer)
1273                 strlcpy(hid->name, dev->manufacturer, sizeof(hid->name));
1274
1275         if (dev->product) {
1276                 if (dev->manufacturer)
1277                         strlcat(hid->name, " ", sizeof(hid->name));
1278                 strlcat(hid->name, dev->product, sizeof(hid->name));
1279         }
1280
1281         if (!strlen(hid->name))
1282                 snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x",
1283                          le16_to_cpu(dev->descriptor.idVendor),
1284                          le16_to_cpu(dev->descriptor.idProduct));
1285
1286         usb_make_path(dev, hid->phys, sizeof(hid->phys));
1287         strlcat(hid->phys, "/input", sizeof(hid->phys));
1288         len = strlen(hid->phys);
1289         if (len < sizeof(hid->phys) - 1)
1290                 snprintf(hid->phys + len, sizeof(hid->phys) - len,
1291                          "%d", intf->altsetting[0].desc.bInterfaceNumber);
1292
1293         if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
1294                 hid->uniq[0] = 0;
1295
1296         usbhid = kzalloc(sizeof(*usbhid), GFP_KERNEL);
1297         if (usbhid == NULL) {
1298                 ret = -ENOMEM;
1299                 goto err;
1300         }
1301
1302         hid->driver_data = usbhid;
1303         usbhid->hid = hid;
1304         usbhid->intf = intf;
1305         usbhid->ifnum = interface->desc.bInterfaceNumber;
1306
1307         init_waitqueue_head(&usbhid->wait);
1308         INIT_WORK(&usbhid->reset_work, hid_reset);
1309         setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
1310         spin_lock_init(&usbhid->lock);
1311
1312         ret = hid_add_device(hid);
1313         if (ret) {
1314                 if (ret != -ENODEV)
1315                         hid_err(intf, "can't add hid device: %d\n", ret);
1316                 goto err_free;
1317         }
1318
1319         return 0;
1320 err_free:
1321         kfree(usbhid);
1322 err:
1323         hid_destroy_device(hid);
1324         return ret;
1325 }
1326
1327 static void usbhid_disconnect(struct usb_interface *intf)
1328 {
1329         struct hid_device *hid = usb_get_intfdata(intf);
1330         struct usbhid_device *usbhid;
1331
1332         if (WARN_ON(!hid))
1333                 return;
1334
1335         usbhid = hid->driver_data;
1336         hid_destroy_device(hid);
1337         kfree(usbhid);
1338 }
1339
1340 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
1341 {
1342         del_timer_sync(&usbhid->io_retry);
1343         cancel_work_sync(&usbhid->reset_work);
1344 }
1345
1346 static void hid_cease_io(struct usbhid_device *usbhid)
1347 {
1348         del_timer_sync(&usbhid->io_retry);
1349         usb_kill_urb(usbhid->urbin);
1350         usb_kill_urb(usbhid->urbctrl);
1351         usb_kill_urb(usbhid->urbout);
1352 }
1353
1354 /* Treat USB reset pretty much the same as suspend/resume */
1355 static int hid_pre_reset(struct usb_interface *intf)
1356 {
1357         struct hid_device *hid = usb_get_intfdata(intf);
1358         struct usbhid_device *usbhid = hid->driver_data;
1359
1360         spin_lock_irq(&usbhid->lock);
1361         set_bit(HID_RESET_PENDING, &usbhid->iofl);
1362         spin_unlock_irq(&usbhid->lock);
1363         hid_cease_io(usbhid);
1364
1365         return 0;
1366 }
1367
1368 /* Same routine used for post_reset and reset_resume */
1369 static int hid_post_reset(struct usb_interface *intf)
1370 {
1371         struct usb_device *dev = interface_to_usbdev (intf);
1372         struct hid_device *hid = usb_get_intfdata(intf);
1373         struct usbhid_device *usbhid = hid->driver_data;
1374         struct usb_host_interface *interface = intf->cur_altsetting;
1375         int status;
1376         char *rdesc;
1377
1378         /* Fetch and examine the HID report descriptor. If this
1379          * has changed, then rebind. Since usbcore's check of the
1380          * configuration descriptors passed, we already know that
1381          * the size of the HID report descriptor has not changed.
1382          */
1383         rdesc = kmalloc(hid->dev_rsize, GFP_KERNEL);
1384         if (!rdesc) {
1385                 dbg_hid("couldn't allocate rdesc memory (post_reset)\n");
1386                 return 1;
1387         }
1388         status = hid_get_class_descriptor(dev,
1389                                 interface->desc.bInterfaceNumber,
1390                                 HID_DT_REPORT, rdesc, hid->dev_rsize);
1391         if (status < 0) {
1392                 dbg_hid("reading report descriptor failed (post_reset)\n");
1393                 kfree(rdesc);
1394                 return 1;
1395         }
1396         status = memcmp(rdesc, hid->dev_rdesc, hid->dev_rsize);
1397         kfree(rdesc);
1398         if (status != 0) {
1399                 dbg_hid("report descriptor changed\n");
1400                 return 1;
1401         }
1402
1403         spin_lock_irq(&usbhid->lock);
1404         clear_bit(HID_RESET_PENDING, &usbhid->iofl);
1405         spin_unlock_irq(&usbhid->lock);
1406         hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
1407         status = hid_start_in(hid);
1408         if (status < 0)
1409                 hid_io_error(hid);
1410         usbhid_restart_queues(usbhid);
1411
1412         return 0;
1413 }
1414
1415 int usbhid_get_power(struct hid_device *hid)
1416 {
1417         struct usbhid_device *usbhid = hid->driver_data;
1418
1419         return usb_autopm_get_interface(usbhid->intf);
1420 }
1421
1422 void usbhid_put_power(struct hid_device *hid)
1423 {
1424         struct usbhid_device *usbhid = hid->driver_data;
1425
1426         usb_autopm_put_interface(usbhid->intf);
1427 }
1428
1429
1430 #ifdef CONFIG_PM
1431 static int hid_resume_common(struct hid_device *hid, bool driver_suspended)
1432 {
1433         struct usbhid_device *usbhid = hid->driver_data;
1434         int status;
1435
1436         spin_lock_irq(&usbhid->lock);
1437         clear_bit(HID_SUSPENDED, &usbhid->iofl);
1438         usbhid_mark_busy(usbhid);
1439
1440         if (test_bit(HID_CLEAR_HALT, &usbhid->iofl) ||
1441                         test_bit(HID_RESET_PENDING, &usbhid->iofl))
1442                 schedule_work(&usbhid->reset_work);
1443         usbhid->retry_delay = 0;
1444
1445         usbhid_restart_queues(usbhid);
1446         spin_unlock_irq(&usbhid->lock);
1447
1448         status = hid_start_in(hid);
1449         if (status < 0)
1450                 hid_io_error(hid);
1451
1452         if (driver_suspended && hid->driver && hid->driver->resume)
1453                 status = hid->driver->resume(hid);
1454         return status;
1455 }
1456
1457 static int hid_suspend(struct usb_interface *intf, pm_message_t message)
1458 {
1459         struct hid_device *hid = usb_get_intfdata(intf);
1460         struct usbhid_device *usbhid = hid->driver_data;
1461         int status = 0;
1462         bool driver_suspended = false;
1463         unsigned int ledcount;
1464
1465         if (PMSG_IS_AUTO(message)) {
1466                 ledcount = hidinput_count_leds(hid);
1467                 spin_lock_irq(&usbhid->lock);   /* Sync with error handler */
1468                 if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
1469                     && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
1470                     && !test_bit(HID_OUT_RUNNING, &usbhid->iofl)
1471                     && !test_bit(HID_CTRL_RUNNING, &usbhid->iofl)
1472                     && !test_bit(HID_KEYS_PRESSED, &usbhid->iofl)
1473                     && (!ledcount || ignoreled))
1474                 {
1475                         set_bit(HID_SUSPENDED, &usbhid->iofl);
1476                         spin_unlock_irq(&usbhid->lock);
1477                         if (hid->driver && hid->driver->suspend) {
1478                                 status = hid->driver->suspend(hid, message);
1479                                 if (status < 0)
1480                                         goto failed;
1481                         }
1482                         driver_suspended = true;
1483                 } else {
1484                         usbhid_mark_busy(usbhid);
1485                         spin_unlock_irq(&usbhid->lock);
1486                         return -EBUSY;
1487                 }
1488
1489         } else {
1490                 /* TODO: resume() might need to handle suspend failure */
1491                 if (hid->driver && hid->driver->suspend)
1492                         status = hid->driver->suspend(hid, message);
1493                 driver_suspended = true;
1494                 spin_lock_irq(&usbhid->lock);
1495                 set_bit(HID_SUSPENDED, &usbhid->iofl);
1496                 spin_unlock_irq(&usbhid->lock);
1497                 if (usbhid_wait_io(hid) < 0)
1498                         status = -EIO;
1499         }
1500
1501         hid_cancel_delayed_stuff(usbhid);
1502         hid_cease_io(usbhid);
1503
1504         if (PMSG_IS_AUTO(message) && test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
1505                 /* lost race against keypresses */
1506                 status = -EBUSY;
1507                 goto failed;
1508         }
1509         dev_dbg(&intf->dev, "suspend\n");
1510         return status;
1511
1512  failed:
1513         hid_resume_common(hid, driver_suspended);
1514         return status;
1515 }
1516
1517 static int hid_resume(struct usb_interface *intf)
1518 {
1519         struct hid_device *hid = usb_get_intfdata (intf);
1520         struct usbhid_device *usbhid = hid->driver_data;
1521         int status;
1522
1523         if (!test_bit(HID_STARTED, &usbhid->iofl))
1524                 return 0;
1525
1526         status = hid_resume_common(hid, true);
1527         dev_dbg(&intf->dev, "resume status %d\n", status);
1528         return 0;
1529 }
1530
1531 static int hid_reset_resume(struct usb_interface *intf)
1532 {
1533         struct hid_device *hid = usb_get_intfdata(intf);
1534         struct usbhid_device *usbhid = hid->driver_data;
1535         int status;
1536
1537         clear_bit(HID_SUSPENDED, &usbhid->iofl);
1538         status = hid_post_reset(intf);
1539         if (status >= 0 && hid->driver && hid->driver->reset_resume) {
1540                 int ret = hid->driver->reset_resume(hid);
1541                 if (ret < 0)
1542                         status = ret;
1543         }
1544         return status;
1545 }
1546
1547 #endif /* CONFIG_PM */
1548
1549 static const struct usb_device_id hid_usb_ids[] = {
1550         { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
1551                 .bInterfaceClass = USB_INTERFACE_CLASS_HID },
1552         { }                                             /* Terminating entry */
1553 };
1554
1555 MODULE_DEVICE_TABLE (usb, hid_usb_ids);
1556
1557 static struct usb_driver hid_driver = {
1558         .name =         "usbhid",
1559         .probe =        usbhid_probe,
1560         .disconnect =   usbhid_disconnect,
1561 #ifdef CONFIG_PM
1562         .suspend =      hid_suspend,
1563         .resume =       hid_resume,
1564         .reset_resume = hid_reset_resume,
1565 #endif
1566         .pre_reset =    hid_pre_reset,
1567         .post_reset =   hid_post_reset,
1568         .id_table =     hid_usb_ids,
1569         .supports_autosuspend = 1,
1570 };
1571
1572 struct usb_interface *usbhid_find_interface(int minor)
1573 {
1574         return usb_find_interface(&hid_driver, minor);
1575 }
1576
1577 static int __init hid_init(void)
1578 {
1579         int retval = -ENOMEM;
1580
1581         retval = usbhid_quirks_init(quirks_param);
1582         if (retval)
1583                 goto usbhid_quirks_init_fail;
1584         retval = usb_register(&hid_driver);
1585         if (retval)
1586                 goto usb_register_fail;
1587         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1588
1589         return 0;
1590 usb_register_fail:
1591         usbhid_quirks_exit();
1592 usbhid_quirks_init_fail:
1593         return retval;
1594 }
1595
1596 static void __exit hid_exit(void)
1597 {
1598         usb_deregister(&hid_driver);
1599         usbhid_quirks_exit();
1600 }
1601
1602 module_init(hid_init);
1603 module_exit(hid_exit);
1604
1605 MODULE_AUTHOR("Andreas Gal");
1606 MODULE_AUTHOR("Vojtech Pavlik");
1607 MODULE_AUTHOR("Jiri Kosina");
1608 MODULE_DESCRIPTION(DRIVER_DESC);
1609 MODULE_LICENSE(DRIVER_LICENSE);