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