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 <[email protected]>
   6  *  Copyright (c) 2005 Michael Haboustak <[email protected]> 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];
  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 || hid->quirks & HID_QUIRK_ALWAYS_POLL) &&
  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;
 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                 if (rc == 0) {
 126                         hid_start_in(hid);
 127                 } else {
 128                         dev_dbg(&usbhid->intf->dev,
 129                                         "clear-halt failed: %d\n", rc);
 130                         set_bit(HID_RESET_PENDING, &usbhid->iofl);
 131                 }
 132         }
 133
 134         if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) {
 135                 dev_dbg(&usbhid->intf->dev, "resetting device\n");
 136                 usb_queue_reset_device(usbhid->intf);
 137         }
 138 }
 139
 140 /* Main I/O error handler */
 141 static void hid_io_error(struct hid_device *hid)
 142 {
 143         unsigned long flags;
 144         struct usbhid_device *usbhid = hid->driver_data;
 145
 146         spin_lock_irqsave(&usbhid->lock, flags);
 147
 148         /* Stop when disconnected */
 149         if (test_bit(HID_DISCONNECTED, &usbhid->iofl))
 150                 goto done;
 151
 152         /* If it has been a while since the last error, we'll assume
 153          * this a brand new error and reset the retry timeout. */
 154         if (time_after(jiffies, usbhid->stop_retry + HZ/2))
 155                 usbhid->retry_delay = 0;
 156
 157         /* When an error occurs, retry at increasing intervals */
 158         if (usbhid->retry_delay == 0) {
 159                 usbhid->retry_delay = 13;       /* Then 26, 52, 104, 104, ... */
 160                 usbhid->stop_retry = jiffies + msecs_to_jiffies(1000);
 161         } else if (usbhid->retry_delay < 100)
 162                 usbhid->retry_delay *= 2;
 163
 164         if (time_after(jiffies, usbhid->stop_retry)) {
 165
 166                 /* Retries failed, so do a port reset unless we lack bandwidth*/
 167                 if (!test_bit(HID_NO_BANDWIDTH, &usbhid->iofl)
 168                      && !test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
 169
 170                         schedule_work(&usbhid->reset_work);
 171                         goto done;
 172                 }
 173         }
 174
 175         mod_timer(&usbhid->io_retry,
 176                         jiffies + msecs_to_jiffies(usbhid->retry_delay));
 177 done:
 178         spin_unlock_irqrestore(&usbhid->lock, flags);
 179 }
 180
 181 static void usbhid_mark_busy(struct usbhid_device *usbhid)
 182 {
 183         struct usb_interface *intf = usbhid->intf;
 184
 185         usb_mark_last_busy(interface_to_usbdev(intf));
 186 }
 187
 188 static int usbhid_restart_out_queue(struct usbhid_device *usbhid)
 189 {
 190         struct hid_device *hid = usb_get_intfdata(usbhid->intf);
 191         int kicked;
 192         int r;
 193
 194         if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
 195                         test_bit(HID_SUSPENDED, &usbhid->iofl))
 196                 return 0;
 197
 198         if ((kicked = (usbhid->outhead != usbhid->outtail))) {
 199                 hid_dbg(hid, "Kicking head %d tail %d", usbhid->outhead, usbhid->outtail);
 200
 201                 /* Try to wake up from autosuspend... */
 202                 r = usb_autopm_get_interface_async(usbhid->intf);
 203                 if (r < 0)
 204                         return r;
 205
 206                 /*
 207                  * If still suspended, don't submit.  Submission will
 208                  * occur if/when resume drains the queue.
 209                  */
 210                 if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
 211                         usb_autopm_put_interface_no_suspend(usbhid->intf);
 212                         return r;
 213                 }
 214
 215                 /* Asynchronously flush queue. */
 216                 set_bit(HID_OUT_RUNNING, &usbhid->iofl);
 217                 if (hid_submit_out(hid)) {
 218                         clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
 219                         usb_autopm_put_interface_async(usbhid->intf);
 220                 }
 221                 wake_up(&usbhid->wait);
 222         }
 223         return kicked;
 224 }
 225
 226 static int usbhid_restart_ctrl_queue(struct usbhid_device *usbhid)
 227 {
 228         struct hid_device *hid = usb_get_intfdata(usbhid->intf);
 229         int kicked;
 230         int r;
 231
 232         WARN_ON(hid == NULL);
 233         if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
 234                         test_bit(HID_SUSPENDED, &usbhid->iofl))
 235                 return 0;
 236
 237         if ((kicked = (usbhid->ctrlhead != usbhid->ctrltail))) {
 238                 hid_dbg(hid, "Kicking head %d tail %d", usbhid->ctrlhead, usbhid->ctrltail);
 239
 240                 /* Try to wake up from autosuspend... */
 241                 r = usb_autopm_get_interface_async(usbhid->intf);
 242                 if (r < 0)
 243                         return r;
 244
 245                 /*
 246                  * If still suspended, don't submit.  Submission will
 247                  * occur if/when resume drains the queue.
 248                  */
 249                 if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
 250                         usb_autopm_put_interface_no_suspend(usbhid->intf);
 251                         return r;
 252                 }
 253
 254                 /* Asynchronously flush queue. */
 255                 set_bit(HID_CTRL_RUNNING, &usbhid->iofl);
 256                 if (hid_submit_ctrl(hid)) {
 257                         clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
 258                         usb_autopm_put_interface_async(usbhid->intf);
 259                 }
 260                 wake_up(&usbhid->wait);
 261         }
 262         return kicked;
 263 }
 264
 265 /*
 266  * Input interrupt completion handler.
 267  */
 268
 269 static void hid_irq_in(struct urb *urb)
 270 {
 271         struct hid_device       *hid = urb->context;
 272         struct usbhid_device    *usbhid = hid->driver_data;
 273         int                     status;
 274
 275         switch (urb->status) {
 276         case 0:                 /* success */
 277                 usbhid->retry_delay = 0;
 278                 if ((hid->quirks & HID_QUIRK_ALWAYS_POLL) && !hid->open)
 279                         break;
 280                 usbhid_mark_busy(usbhid);
 281                 if (!test_bit(HID_RESUME_RUNNING, &usbhid->iofl)) {
 282                         hid_input_report(urb->context, HID_INPUT_REPORT,
 283                                          urb->transfer_buffer,
 284                                          urb->actual_length, 1);
 285                         /*
 286                          * autosuspend refused while keys are pressed
 287                          * because most keyboards don't wake up when
 288                          * a key is released
 289                          */
 290                         if (hid_check_keys_pressed(hid))
 291                                 set_bit(HID_KEYS_PRESSED, &usbhid->iofl);
 292                         else
 293                                 clear_bit(HID_KEYS_PRESSED, &usbhid->iofl);
 294                 }
 295                 break;
 296         case -EPIPE:            /* stall */
 297                 usbhid_mark_busy(usbhid);
 298                 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
 299                 set_bit(HID_CLEAR_HALT, &usbhid->iofl);
 300                 schedule_work(&usbhid->reset_work);
 301                 return;
 302         case -ECONNRESET:       /* unlink */
 303         case -ENOENT:
 304         case -ESHUTDOWN:        /* unplug */
 305                 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
 306                 return;
 307         case -EILSEQ:           /* protocol error or unplug */
 308         case -EPROTO:           /* protocol error or unplug */
 309         case -ETIME:            /* protocol error or unplug */
 310         case -ETIMEDOUT:        /* Should never happen, but... */
 311                 usbhid_mark_busy(usbhid);
 312                 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
 313                 hid_io_error(hid);
 314                 return;
 315         default:                /* error */
 316                 hid_warn(urb->dev, "input irq status %d received\n",
 317                          urb->status);
 318         }
 319
 320         status = usb_submit_urb(urb, GFP_ATOMIC);
 321         if (status) {
 322                 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
 323                 if (status != -EPERM) {
 324                         hid_err(hid, "can't resubmit intr, %s-%s/input%d, status %d\n",
 325                                 hid_to_usb_dev(hid)->bus->bus_name,
 326                                 hid_to_usb_dev(hid)->devpath,
 327                                 usbhid->ifnum, status);
 328                         hid_io_error(hid);
 329                 }
 330         }
 331 }
 332
 333 static int hid_submit_out(struct hid_device *hid)
 334 {
 335         struct hid_report *report;
 336         char *raw_report;
 337         struct usbhid_device *usbhid = hid->driver_data;
 338         int r;
 339
 340         report = usbhid->out[usbhid->outtail].report;
 341         raw_report = usbhid->out[usbhid->outtail].raw_report;
 342
 343         usbhid->urbout->transfer_buffer_length = hid_report_len(report);
 344         usbhid->urbout->dev = hid_to_usb_dev(hid);
 345         if (raw_report) {
 346                 memcpy(usbhid->outbuf, raw_report,
 347                                 usbhid->urbout->transfer_buffer_length);
 348                 kfree(raw_report);
 349                 usbhid->out[usbhid->outtail].raw_report = NULL;
 350         }
 351
 352         dbg_hid("submitting out urb\n");
 353
 354         r = usb_submit_urb(usbhid->urbout, GFP_ATOMIC);
 355         if (r < 0) {
 356                 hid_err(hid, "usb_submit_urb(out) failed: %d\n", r);
 357                 return r;
 358         }
 359         usbhid->last_out = jiffies;
 360         return 0;
 361 }
 362
 363 static int hid_submit_ctrl(struct hid_device *hid)
 364 {
 365         struct hid_report *report;
 366         unsigned char dir;
 367         char *raw_report;
 368         int len, r;
 369         struct usbhid_device *usbhid = hid->driver_data;
 370
 371         report = usbhid->ctrl[usbhid->ctrltail].report;
 372         raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;
 373         dir = usbhid->ctrl[usbhid->ctrltail].dir;
 374
 375         len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
 376         if (dir == USB_DIR_OUT) {
 377                 usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
 378                 usbhid->urbctrl->transfer_buffer_length = len;
 379                 if (raw_report) {
 380                         memcpy(usbhid->ctrlbuf, raw_report, len);
 381                         kfree(raw_report);
 382                         usbhid->ctrl[usbhid->ctrltail].raw_report = NULL;
 383                 }
 384         } else {
 385                 int maxpacket, padlen;
 386
 387                 usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
 388                 maxpacket = usb_maxpacket(hid_to_usb_dev(hid),
 389                                           usbhid->urbctrl->pipe, 0);
 390                 if (maxpacket > 0) {
 391                         padlen = DIV_ROUND_UP(len, maxpacket);
 392                         padlen *= maxpacket;
 393                         if (padlen > usbhid->bufsize)
 394                                 padlen = usbhid->bufsize;
 395                 } else
 396                         padlen = 0;
 397                 usbhid->urbctrl->transfer_buffer_length = padlen;
 398         }
 399         usbhid->urbctrl->dev = hid_to_usb_dev(hid);
 400
 401         usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
 402         usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT :
 403                                                       HID_REQ_GET_REPORT;
 404         usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) |
 405                                          report->id);
 406         usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
 407         usbhid->cr->wLength = cpu_to_le16(len);
 408
 409         dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n",
 410                 usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" :
 411                                                              "Get_Report",
 412                 usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);
 413
 414         r = usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC);
 415         if (r < 0) {
 416                 hid_err(hid, "usb_submit_urb(ctrl) failed: %d\n", r);
 417                 return r;
 418         }
 419         usbhid->last_ctrl = jiffies;
 420         return 0;
 421 }
 422
 423 /*
 424  * Output interrupt completion handler.
 425  */
 426
 427 static void hid_irq_out(struct urb *urb)
 428 {
 429         struct hid_device *hid = urb->context;
 430         struct usbhid_device *usbhid = hid->driver_data;
 431         unsigned long flags;
 432         int unplug = 0;
 433
 434         switch (urb->status) {
 435         case 0:                 /* success */
 436                 break;
 437         case -ESHUTDOWN:        /* unplug */
 438                 unplug = 1;
 439         case -EILSEQ:           /* protocol error or unplug */
 440         case -EPROTO:           /* protocol error or unplug */
 441         case -ECONNRESET:       /* unlink */
 442         case -ENOENT:
 443                 break;
 444         default:                /* error */
 445                 hid_warn(urb->dev, "output irq status %d received\n",
 446                          urb->status);
 447         }
 448
 449         spin_lock_irqsave(&usbhid->lock, flags);
 450
 451         if (unplug) {
 452                 usbhid->outtail = usbhid->outhead;
 453         } else {
 454                 usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1);
 455
 456                 if (usbhid->outhead != usbhid->outtail &&
 457                                 hid_submit_out(hid) == 0) {
 458                         /* Successfully submitted next urb in queue */
 459                         spin_unlock_irqrestore(&usbhid->lock, flags);
 460                         return;
 461                 }
 462         }
 463
 464         clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
 465         spin_unlock_irqrestore(&usbhid->lock, flags);
 466         usb_autopm_put_interface_async(usbhid->intf);
 467         wake_up(&usbhid->wait);
 468 }
 469
 470 /*
 471  * Control pipe completion handler.
 472  */
 473
 474 static void hid_ctrl(struct urb *urb)
 475 {
 476         struct hid_device *hid = urb->context;
 477         struct usbhid_device *usbhid = hid->driver_data;
 478         int unplug = 0, status = urb->status;
 479
 480         switch (status) {
 481         case 0:                 /* success */
 482                 if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN)
 483                         hid_input_report(urb->context,
 484                                 usbhid->ctrl[usbhid->ctrltail].report->type,
 485                                 urb->transfer_buffer, urb->actual_length, 0);
 486                 break;
 487         case -ESHUTDOWN:        /* unplug */
 488                 unplug = 1;
 489         case -EILSEQ:           /* protocol error or unplug */
 490         case -EPROTO:           /* protocol error or unplug */
 491         case -ECONNRESET:       /* unlink */
 492         case -ENOENT:
 493         case -EPIPE:            /* report not available */
 494                 break;
 495         default:                /* error */
 496                 hid_warn(urb->dev, "ctrl urb status %d received\n", status);
 497         }
 498
 499         spin_lock(&usbhid->lock);
 500
 501         if (unplug) {
 502                 usbhid->ctrltail = usbhid->ctrlhead;
 503         } else {
 504                 usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
 505
 506                 if (usbhid->ctrlhead != usbhid->ctrltail &&
 507                                 hid_submit_ctrl(hid) == 0) {
 508                         /* Successfully submitted next urb in queue */
 509                         spin_unlock(&usbhid->lock);
 510                         return;
 511                 }
 512         }
 513
 514         clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
 515         spin_unlock(&usbhid->lock);
 516         usb_autopm_put_interface_async(usbhid->intf);
 517         wake_up(&usbhid->wait);
 518 }
 519
 520 static void __usbhid_submit_report(struct hid_device *hid, struct hid_report *report,
 521                                    unsigned char dir)
 522 {
 523         int head;
 524         struct usbhid_device *usbhid = hid->driver_data;
 525
 526         if (((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN) ||
 527                 test_bit(HID_DISCONNECTED, &usbhid->iofl))
 528                 return;
 529
 530         if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {
 531                 if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) {
 532                         hid_warn(hid, "output queue full\n");
 533                         return;
 534                 }
 535
 536                 usbhid->out[usbhid->outhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
 537                 if (!usbhid->out[usbhid->outhead].raw_report) {
 538                         hid_warn(hid, "output queueing failed\n");
 539                         return;
 540                 }
 541                 hid_output_report(report, usbhid->out[usbhid->outhead].raw_report);
 542                 usbhid->out[usbhid->outhead].report = report;
 543                 usbhid->outhead = head;
 544
 545                 /* If the queue isn't running, restart it */
 546                 if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl)) {
 547                         usbhid_restart_out_queue(usbhid);
 548
 549                 /* Otherwise see if an earlier request has timed out */
 550                 } else if (time_after(jiffies, usbhid->last_out + HZ * 5)) {
 551
 552                         /* Prevent autosuspend following the unlink */
 553                         usb_autopm_get_interface_no_resume(usbhid->intf);
 554
 555                         /*
 556                          * Prevent resubmission in case the URB completes
 557                          * before we can unlink it.  We don't want to cancel
 558                          * the wrong transfer!
 559                          */
 560                         usb_block_urb(usbhid->urbout);
 561
 562                         /* Drop lock to avoid deadlock if the callback runs */
 563                         spin_unlock(&usbhid->lock);
 564
 565                         usb_unlink_urb(usbhid->urbout);
 566                         spin_lock(&usbhid->lock);
 567                         usb_unblock_urb(usbhid->urbout);
 568
 569                         /* Unlink might have stopped the queue */
 570                         if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl))
 571                                 usbhid_restart_out_queue(usbhid);
 572
 573                         /* Now we can allow autosuspend again */
 574                         usb_autopm_put_interface_async(usbhid->intf);
 575                 }
 576                 return;
 577         }
 578
 579         if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
 580                 hid_warn(hid, "control queue full\n");
 581                 return;
 582         }
 583
 584         if (dir == USB_DIR_OUT) {
 585                 usbhid->ctrl[usbhid->ctrlhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
 586                 if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) {
 587                         hid_warn(hid, "control queueing failed\n");
 588                         return;
 589                 }
 590                 hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report);
 591         }
 592         usbhid->ctrl[usbhid->ctrlhead].report = report;
 593         usbhid->ctrl[usbhid->ctrlhead].dir = dir;
 594         usbhid->ctrlhead = head;
 595
 596         /* If the queue isn't running, restart it */
 597         if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) {
 598                 usbhid_restart_ctrl_queue(usbhid);
 599
 600         /* Otherwise see if an earlier request has timed out */
 601         } else if (time_after(jiffies, usbhid->last_ctrl + HZ * 5)) {
 602
 603                 /* Prevent autosuspend following the unlink */
 604                 usb_autopm_get_interface_no_resume(usbhid->intf);
 605
 606                 /*
 607                  * Prevent resubmission in case the URB completes
 608                  * before we can unlink it.  We don't want to cancel
 609                  * the wrong transfer!
 610                  */
 611                 usb_block_urb(usbhid->urbctrl);
 612
 613                 /* Drop lock to avoid deadlock if the callback runs */
 614                 spin_unlock(&usbhid->lock);
 615
 616                 usb_unlink_urb(usbhid->urbctrl);
 617                 spin_lock(&usbhid->lock);
 618                 usb_unblock_urb(usbhid->urbctrl);
 619
 620                 /* Unlink might have stopped the queue */
 621                 if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
 622                         usbhid_restart_ctrl_queue(usbhid);
 623
 624                 /* Now we can allow autosuspend again */
 625                 usb_autopm_put_interface_async(usbhid->intf);
 626         }
 627 }
 628
 629 static void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
 630 {
 631         struct usbhid_device *usbhid = hid->driver_data;
 632         unsigned long flags;
 633
 634         spin_lock_irqsave(&usbhid->lock, flags);
 635         __usbhid_submit_report(hid, report, dir);
 636         spin_unlock_irqrestore(&usbhid->lock, flags);
 637 }
 638
 639 static int usbhid_wait_io(struct hid_device *hid)
 640 {
 641         struct usbhid_device *usbhid = hid->driver_data;
 642
 643         if (!wait_event_timeout(usbhid->wait,
 644                                 (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
 645                                 !test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
 646                                         10*HZ)) {
 647                 dbg_hid("timeout waiting for ctrl or out queue to clear\n");
 648                 return -1;
 649         }
 650
 651         return 0;
 652 }
 653
 654 static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
 655 {
 656         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 657                 HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report,
 658                 ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
 659 }
 660
 661 static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
 662                 unsigned char type, void *buf, int size)
 663 {
 664         int result, retries = 4;
 665
 666         memset(buf, 0, size);
 667
 668         do {
 669                 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 670                                 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
 671                                 (type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT);
 672                 retries--;
 673         } while (result < size && retries);
 674         return result;
 675 }
 676
 677 int usbhid_open(struct hid_device *hid)
 678 {
 679         struct usbhid_device *usbhid = hid->driver_data;
 680         int res = 0;
 681
 682         mutex_lock(&hid_open_mut);
 683         if (!hid->open++) {
 684                 res = usb_autopm_get_interface(usbhid->intf);
 685                 /* the device must be awake to reliably request remote wakeup */
 686                 if (res < 0) {
 687                         hid->open--;
 688                         res = -EIO;
 689                         goto done;
 690                 }
 691                 usbhid->intf->needs_remote_wakeup = 1;
 692                 set_bit(HID_RESUME_RUNNING, &usbhid->iofl);
 693                 res = hid_start_in(hid);
 694                 if (res) {
 695                         if (res != -ENOSPC) {
 696                                 hid_io_error(hid);
 697                                 res = 0;
 698                         } else {
 699                                 /* no use opening if resources are insufficient */
 700                                 hid->open--;
 701                                 res = -EBUSY;
 702                                 usbhid->intf->needs_remote_wakeup = 0;
 703                         }
 704                 }
 705                 usb_autopm_put_interface(usbhid->intf);
 706
 707                 /*
 708                  * In case events are generated while nobody was listening,
 709                  * some are released when the device is re-opened.
 710                  * Wait 50 msec for the queue to empty before allowing events
 711                  * to go through hid.
 712                  */
 713                 if (res == 0 && !(hid->quirks & HID_QUIRK_ALWAYS_POLL))
 714                         msleep(50);
 715                 clear_bit(HID_RESUME_RUNNING, &usbhid->iofl);
 716         }
 717 done:
 718         mutex_unlock(&hid_open_mut);
 719         return res;
 720 }
 721
 722 void usbhid_close(struct hid_device *hid)
 723 {
 724         struct usbhid_device *usbhid = hid->driver_data;
 725
 726         mutex_lock(&hid_open_mut);
 727
 728         /* protecting hid->open to make sure we don't restart
 729          * data acquistion due to a resumption we no longer
 730          * care about
 731          */
 732         spin_lock_irq(&usbhid->lock);
 733         if (!--hid->open) {
 734                 spin_unlock_irq(&usbhid->lock);
 735                 hid_cancel_delayed_stuff(usbhid);
 736                 if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL)) {
 737                         usb_kill_urb(usbhid->urbin);
 738                         usbhid->intf->needs_remote_wakeup = 0;
 739                 }
 740         } else {
 741                 spin_unlock_irq(&usbhid->lock);
 742         }
 743         mutex_unlock(&hid_open_mut);
 744 }
 745
 746 /*
 747  * Initialize all reports
 748  */
 749
 750 void usbhid_init_reports(struct hid_device *hid)
 751 {
 752         struct hid_report *report;
 753         struct usbhid_device *usbhid = hid->driver_data;
 754         struct hid_report_enum *report_enum;
 755         int err, ret;
 756
 757         if (!(hid->quirks & HID_QUIRK_NO_INIT_INPUT_REPORTS)) {
 758                 report_enum = &hid->report_enum[HID_INPUT_REPORT];
 759                 list_for_each_entry(report, &report_enum->report_list, list)
 760                         usbhid_submit_report(hid, report, USB_DIR_IN);
 761         }
 762
 763         report_enum = &hid->report_enum[HID_FEATURE_REPORT];
 764         list_for_each_entry(report, &report_enum->report_list, list)
 765                 usbhid_submit_report(hid, report, USB_DIR_IN);
 766
 767         err = 0;
 768         ret = usbhid_wait_io(hid);
 769         while (ret) {
 770                 err |= ret;
 771                 if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
 772                         usb_kill_urb(usbhid->urbctrl);
 773                 if (test_bit(HID_OUT_RUNNING, &usbhid->iofl))
 774                         usb_kill_urb(usbhid->urbout);
 775                 ret = usbhid_wait_io(hid);
 776         }
 777
 778         if (err)
 779                 hid_warn(hid, "timeout initializing reports\n");
 780 }
 781
 782 /*
 783  * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
 784  */
 785 static int hid_find_field_early(struct hid_device *hid, unsigned int page,
 786     unsigned int hid_code, struct hid_field **pfield)
 787 {
 788         struct hid_report *report;
 789         struct hid_field *field;
 790         struct hid_usage *usage;
 791         int i, j;
 792
 793         list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
 794                 for (i = 0; i < report->maxfield; i++) {
 795                         field = report->field[i];
 796                         for (j = 0; j < field->maxusage; j++) {
 797                                 usage = &field->usage[j];
 798                                 if ((usage->hid & HID_USAGE_PAGE) == page &&
 799                                     (usage->hid & 0xFFFF) == hid_code) {
 800                                         *pfield = field;
 801                                         return j;
 802                                 }
 803                         }
 804                 }
 805         }
 806         return -1;
 807 }
 808
 809 static void usbhid_set_leds(struct hid_device *hid)
 810 {
 811         struct hid_field *field;
 812         int offset;
 813
 814         if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) {
 815                 hid_set_field(field, offset, 0);
 816                 usbhid_submit_report(hid, field->report, USB_DIR_OUT);
 817         }
 818 }
 819
 820 /*
 821  * Traverse the supplied list of reports and find the longest
 822  */
 823 static void hid_find_max_report(struct hid_device *hid, unsigned int type,
 824                 unsigned int *max)
 825 {
 826         struct hid_report *report;
 827         unsigned int size;
 828
 829         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
 830                 size = ((report->size - 1) >> 3) + 1 + hid->report_enum[type].numbered;
 831                 if (*max < size)
 832                         *max = size;
 833         }
 834 }
 835
 836 static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
 837 {
 838         struct usbhid_device *usbhid = hid->driver_data;
 839
 840         usbhid->inbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
 841                         &usbhid->inbuf_dma);
 842         usbhid->outbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
 843                         &usbhid->outbuf_dma);
 844         usbhid->cr = kmalloc(sizeof(*usbhid->cr), GFP_KERNEL);
 845         usbhid->ctrlbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
 846                         &usbhid->ctrlbuf_dma);
 847         if (!usbhid->inbuf || !usbhid->outbuf || !usbhid->cr ||
 848                         !usbhid->ctrlbuf)
 849                 return -1;
 850
 851         return 0;
 852 }
 853
 854 static int usbhid_get_raw_report(struct hid_device *hid,
 855                 unsigned char report_number, __u8 *buf, size_t count,
 856                 unsigned char report_type)
 857 {
 858         struct usbhid_device *usbhid = hid->driver_data;
 859         struct usb_device *dev = hid_to_usb_dev(hid);
 860         struct usb_interface *intf = usbhid->intf;
 861         struct usb_host_interface *interface = intf->cur_altsetting;
 862         int skipped_report_id = 0;
 863         int ret;
 864
 865         /* Byte 0 is the report number. Report data starts at byte 1.*/
 866         buf[0] = report_number;
 867         if (report_number == 0x0) {
 868                 /* Offset the return buffer by 1, so that the report ID
 869                    will remain in byte 0. */
 870                 buf++;
 871                 count--;
 872                 skipped_report_id = 1;
 873         }
 874         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 875                 HID_REQ_GET_REPORT,
 876                 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 877                 ((report_type + 1) << 8) | report_number,
 878                 interface->desc.bInterfaceNumber, buf, count,
 879                 USB_CTRL_SET_TIMEOUT);
 880
 881         /* count also the report id */
 882         if (ret > 0 && skipped_report_id)
 883                 ret++;
 884
 885         return ret;
 886 }
 887
 888 static int usbhid_set_raw_report(struct hid_device *hid, unsigned int reportnum,
 889                                  __u8 *buf, size_t count, unsigned char rtype)
 890 {
 891         struct usbhid_device *usbhid = hid->driver_data;
 892         struct usb_device *dev = hid_to_usb_dev(hid);
 893         struct usb_interface *intf = usbhid->intf;
 894         struct usb_host_interface *interface = intf->cur_altsetting;
 895         int ret, skipped_report_id = 0;
 896
 897         /* Byte 0 is the report number. Report data starts at byte 1.*/
 898         if ((rtype == HID_OUTPUT_REPORT) &&
 899             (hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORT_ID))
 900                 buf[0] = 0;
 901         else
 902                 buf[0] = reportnum;
 903
 904         if (buf[0] == 0x0) {
 905                 /* Don't send the Report ID */
 906                 buf++;
 907                 count--;
 908                 skipped_report_id = 1;
 909         }
 910
 911         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 912                         HID_REQ_SET_REPORT,
 913                         USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 914                         ((rtype + 1) << 8) | reportnum,
 915                         interface->desc.bInterfaceNumber, buf, count,
 916                         USB_CTRL_SET_TIMEOUT);
 917         /* count also the report id, if this was a numbered report. */
 918         if (ret > 0 && skipped_report_id)
 919                 ret++;
 920
 921         return ret;
 922 }
 923
 924 static int usbhid_output_report(struct hid_device *hid, __u8 *buf, size_t count)
 925 {
 926         struct usbhid_device *usbhid = hid->driver_data;
 927         struct usb_device *dev = hid_to_usb_dev(hid);
 928         int actual_length, skipped_report_id = 0, ret;
 929
 930         if (!usbhid->urbout)
 931                 return -ENOSYS;
 932
 933         if (buf[0] == 0x0) {
 934                 /* Don't send the Report ID */
 935                 buf++;
 936                 count--;
 937                 skipped_report_id = 1;
 938         }
 939
 940         ret = usb_interrupt_msg(dev, usbhid->urbout->pipe,
 941                                 buf, count, &actual_length,
 942                                 USB_CTRL_SET_TIMEOUT);
 943         /* return the number of bytes transferred */
 944         if (ret == 0) {
 945                 ret = actual_length;
 946                 /* count also the report id */
 947                 if (skipped_report_id)
 948                         ret++;
 949         }
 950
 951         return ret;
 952 }
 953
 954 static void usbhid_restart_queues(struct usbhid_device *usbhid)
 955 {
 956         if (usbhid->urbout && !test_bit(HID_OUT_RUNNING, &usbhid->iofl))
 957                 usbhid_restart_out_queue(usbhid);
 958         if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
 959                 usbhid_restart_ctrl_queue(usbhid);
 960 }
 961
 962 static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
 963 {
 964         struct usbhid_device *usbhid = hid->driver_data;
 965
 966         usb_free_coherent(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
 967         usb_free_coherent(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
 968         kfree(usbhid->cr);
 969         usb_free_coherent(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
 970 }
 971
 972 static int usbhid_parse(struct hid_device *hid)
 973 {
 974         struct usb_interface *intf = to_usb_interface(hid->dev.parent);
 975         struct usb_host_interface *interface = intf->cur_altsetting;
 976         struct usb_device *dev = interface_to_usbdev (intf);
 977         struct hid_descriptor *hdesc;
 978         u32 quirks = 0;
 979         unsigned int rsize = 0;
 980         char *rdesc;
 981         int ret, n;
 982
 983         quirks = usbhid_lookup_quirk(le16_to_cpu(dev->descriptor.idVendor),
 984                         le16_to_cpu(dev->descriptor.idProduct));
 985
 986         if (quirks & HID_QUIRK_IGNORE)
 987                 return -ENODEV;
 988
 989         /* Many keyboards and mice don't like to be polled for reports,
 990          * so we will always set the HID_QUIRK_NOGET flag for them. */
 991         if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
 992                 if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD ||
 993                         interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE)
 994                                 quirks |= HID_QUIRK_NOGET;
 995         }
 996
 997         if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) &&
 998             (!interface->desc.bNumEndpoints ||
 999              usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) {
1000                 dbg_hid("class descriptor not present\n");
1001                 return -ENODEV;
1002         }
1003
1004         hid->version = le16_to_cpu(hdesc->bcdHID);
1005         hid->country = hdesc->bCountryCode;
1006
1007         for (n = 0; n < hdesc->bNumDescriptors; n++)
1008                 if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT)
1009                         rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);
1010
1011         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
1012                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
1013                 return -EINVAL;
1014         }
1015
1016         if (!(rdesc = kmalloc(rsize, GFP_KERNEL))) {
1017                 dbg_hid("couldn't allocate rdesc memory\n");
1018                 return -ENOMEM;
1019         }
1020
1021         hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0);
1022
1023         ret = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber,
1024                         HID_DT_REPORT, rdesc, rsize);
1025         if (ret < 0) {
1026                 dbg_hid("reading report descriptor failed\n");
1027                 kfree(rdesc);
1028                 goto err;
1029         }
1030
1031         ret = hid_parse_report(hid, rdesc, rsize);
1032         kfree(rdesc);
1033         if (ret) {
1034                 dbg_hid("parsing report descriptor failed\n");
1035                 goto err;
1036         }
1037
1038         hid->quirks |= quirks;
1039
1040         return 0;
1041 err:
1042         return ret;
1043 }
1044
1045 static int usbhid_start(struct hid_device *hid)
1046 {
1047         struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1048         struct usb_host_interface *interface = intf->cur_altsetting;
1049         struct usb_device *dev = interface_to_usbdev(intf);
1050         struct usbhid_device *usbhid = hid->driver_data;
1051         unsigned int n, insize = 0;
1052         int ret;
1053
1054         clear_bit(HID_DISCONNECTED, &usbhid->iofl);
1055
1056         usbhid->bufsize = HID_MIN_BUFFER_SIZE;
1057         hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
1058         hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
1059         hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize);
1060
1061         if (usbhid->bufsize > HID_MAX_BUFFER_SIZE)
1062                 usbhid->bufsize = HID_MAX_BUFFER_SIZE;
1063
1064         hid_find_max_report(hid, HID_INPUT_REPORT, &insize);
1065
1066         if (insize > HID_MAX_BUFFER_SIZE)
1067                 insize = HID_MAX_BUFFER_SIZE;
1068
1069         if (hid_alloc_buffers(dev, hid)) {
1070                 ret = -ENOMEM;
1071                 goto fail;
1072         }
1073
1074         for (n = 0; n < interface->desc.bNumEndpoints; n++) {
1075                 struct usb_endpoint_descriptor *endpoint;
1076                 int pipe;
1077                 int interval;
1078
1079                 endpoint = &interface->endpoint[n].desc;
1080                 if (!usb_endpoint_xfer_int(endpoint))
1081                         continue;
1082
1083                 interval = endpoint->bInterval;
1084
1085                 /* Some vendors give fullspeed interval on highspeed devides */
1086                 if (hid->quirks & HID_QUIRK_FULLSPEED_INTERVAL &&
1087                     dev->speed == USB_SPEED_HIGH) {
1088                         interval = fls(endpoint->bInterval*8);
1089                         printk(KERN_INFO "%s: Fixing fullspeed to highspeed interval: %d -> %d\n",
1090                                hid->name, endpoint->bInterval, interval);
1091                 }
1092
1093                 /* Change the polling interval of mice. */
1094                 if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0)
1095                         interval = hid_mousepoll_interval;
1096
1097                 ret = -ENOMEM;
1098                 if (usb_endpoint_dir_in(endpoint)) {
1099                         if (usbhid->urbin)
1100                                 continue;
1101                         if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
1102                                 goto fail;
1103                         pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
1104                         usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize,
1105                                          hid_irq_in, hid, interval);
1106                         usbhid->urbin->transfer_dma = usbhid->inbuf_dma;
1107                         usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1108                 } else {
1109                         if (usbhid->urbout)
1110                                 continue;
1111                         if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
1112                                 goto fail;
1113                         pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress);
1114                         usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0,
1115                                          hid_irq_out, hid, interval);
1116                         usbhid->urbout->transfer_dma = usbhid->outbuf_dma;
1117                         usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1118                 }
1119         }
1120
1121         usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
1122         if (!usbhid->urbctrl) {
1123                 ret = -ENOMEM;
1124                 goto fail;
1125         }
1126
1127         usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr,
1128                              usbhid->ctrlbuf, 1, hid_ctrl, hid);
1129         usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
1130         usbhid->urbctrl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1131
1132         if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
1133                 usbhid_init_reports(hid);
1134
1135         set_bit(HID_STARTED, &usbhid->iofl);
1136
1137         if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
1138                 ret = usb_autopm_get_interface(usbhid->intf);
1139                 if (ret)
1140                         goto fail;
1141                 usbhid->intf->needs_remote_wakeup = 1;
1142                 ret = hid_start_in(hid);
1143                 if (ret) {
1144                         dev_err(&hid->dev,
1145                                 "failed to start in urb: %d\n", ret);
1146                 }
1147                 usb_autopm_put_interface(usbhid->intf);
1148         }
1149
1150         /* Some keyboards don't work until their LEDs have been set.
1151          * Since BIOSes do set the LEDs, it must be safe for any device
1152          * that supports the keyboard boot protocol.
1153          * In addition, enable remote wakeup by default for all keyboard
1154          * devices supporting the boot protocol.
1155          */
1156         if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT &&
1157                         interface->desc.bInterfaceProtocol ==
1158                                 USB_INTERFACE_PROTOCOL_KEYBOARD) {
1159                 usbhid_set_leds(hid);
1160                 device_set_wakeup_enable(&dev->dev, 1);
1161         }
1162         return 0;
1163
1164 fail:
1165         usb_free_urb(usbhid->urbin);
1166         usb_free_urb(usbhid->urbout);
1167         usb_free_urb(usbhid->urbctrl);
1168         usbhid->urbin = NULL;
1169         usbhid->urbout = NULL;
1170         usbhid->urbctrl = NULL;
1171         hid_free_buffers(dev, hid);
1172         return ret;
1173 }
1174
1175 static void usbhid_stop(struct hid_device *hid)
1176 {
1177         struct usbhid_device *usbhid = hid->driver_data;
1178
1179         if (WARN_ON(!usbhid))
1180                 return;
1181
1182         if (hid->quirks & HID_QUIRK_ALWAYS_POLL)
1183                 usbhid->intf->needs_remote_wakeup = 0;
1184
1185         clear_bit(HID_STARTED, &usbhid->iofl);
1186         spin_lock_irq(&usbhid->lock);   /* Sync with error and led handlers */
1187         set_bit(HID_DISCONNECTED, &usbhid->iofl);
1188         spin_unlock_irq(&usbhid->lock);
1189         usb_kill_urb(usbhid->urbin);
1190         usb_kill_urb(usbhid->urbout);
1191         usb_kill_urb(usbhid->urbctrl);
1192
1193         hid_cancel_delayed_stuff(usbhid);
1194
1195         hid->claimed = 0;
1196
1197         usb_free_urb(usbhid->urbin);
1198         usb_free_urb(usbhid->urbctrl);
1199         usb_free_urb(usbhid->urbout);
1200         usbhid->urbin = NULL; /* don't mess up next start */
1201         usbhid->urbctrl = NULL;
1202         usbhid->urbout = NULL;
1203
1204         hid_free_buffers(hid_to_usb_dev(hid), hid);
1205 }
1206
1207 static int usbhid_power(struct hid_device *hid, int lvl)
1208 {
1209         int r = 0;
1210
1211         switch (lvl) {
1212         case PM_HINT_FULLON:
1213                 r = usbhid_get_power(hid);
1214                 break;
1215         case PM_HINT_NORMAL:
1216                 usbhid_put_power(hid);
1217                 break;
1218         }
1219         return r;
1220 }
1221
1222 static void usbhid_request(struct hid_device *hid, struct hid_report *rep, int reqtype)
1223 {
1224         switch (reqtype) {
1225         case HID_REQ_GET_REPORT:
1226                 usbhid_submit_report(hid, rep, USB_DIR_IN);
1227                 break;
1228         case HID_REQ_SET_REPORT:
1229                 usbhid_submit_report(hid, rep, USB_DIR_OUT);
1230                 break;
1231         }
1232 }
1233
1234 static int usbhid_raw_request(struct hid_device *hid, unsigned char reportnum,
1235                               __u8 *buf, size_t len, unsigned char rtype,
1236                               int reqtype)
1237 {
1238         switch (reqtype) {
1239         case HID_REQ_GET_REPORT:
1240                 return usbhid_get_raw_report(hid, reportnum, buf, len, rtype);
1241         case HID_REQ_SET_REPORT:
1242                 return usbhid_set_raw_report(hid, reportnum, buf, len, rtype);
1243         default:
1244                 return -EIO;
1245         }
1246 }
1247
1248 static int usbhid_idle(struct hid_device *hid, int report, int idle,
1249                 int reqtype)
1250 {
1251         struct usb_device *dev = hid_to_usb_dev(hid);
1252         struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1253         struct usb_host_interface *interface = intf->cur_altsetting;
1254         int ifnum = interface->desc.bInterfaceNumber;
1255
1256         if (reqtype != HID_REQ_SET_IDLE)
1257                 return -EINVAL;
1258
1259         return hid_set_idle(dev, ifnum, report, idle);
1260 }
1261
1262 static struct hid_ll_driver usb_hid_driver = {
1263         .parse = usbhid_parse,
1264         .start = usbhid_start,
1265         .stop = usbhid_stop,
1266         .open = usbhid_open,
1267         .close = usbhid_close,
1268         .power = usbhid_power,
1269         .request = usbhid_request,
1270         .wait = usbhid_wait_io,
1271         .raw_request = usbhid_raw_request,
1272         .output_report = usbhid_output_report,
1273         .idle = usbhid_idle,
1274 };
1275
1276 static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
1277 {
1278         struct usb_host_interface *interface = intf->cur_altsetting;
1279         struct usb_device *dev = interface_to_usbdev(intf);
1280         struct usbhid_device *usbhid;
1281         struct hid_device *hid;
1282         unsigned int n, has_in = 0;
1283         size_t len;
1284         int ret;
1285
1286         dbg_hid("HID probe called for ifnum %d\n",
1287                         intf->altsetting->desc.bInterfaceNumber);
1288
1289         for (n = 0; n < interface->desc.bNumEndpoints; n++)
1290                 if (usb_endpoint_is_int_in(&interface->endpoint[n].desc))
1291                         has_in++;
1292         if (!has_in) {
1293                 hid_err(intf, "couldn't find an input interrupt endpoint\n");
1294                 return -ENODEV;
1295         }
1296
1297         hid = hid_allocate_device();
1298         if (IS_ERR(hid))
1299                 return PTR_ERR(hid);
1300
1301         usb_set_intfdata(intf, hid);
1302         hid->ll_driver = &usb_hid_driver;
1303         hid->ff_init = hid_pidff_init;
1304 #ifdef CONFIG_USB_HIDDEV
1305         hid->hiddev_connect = hiddev_connect;
1306         hid->hiddev_disconnect = hiddev_disconnect;
1307         hid->hiddev_hid_event = hiddev_hid_event;
1308         hid->hiddev_report_event = hiddev_report_event;
1309 #endif
1310         hid->dev.parent = &intf->dev;
1311         hid->bus = BUS_USB;
1312         hid->vendor = le16_to_cpu(dev->descriptor.idVendor);
1313         hid->product = le16_to_cpu(dev->descriptor.idProduct);
1314         hid->name[0] = 0;
1315         hid->quirks = usbhid_lookup_quirk(hid->vendor, hid->product);
1316         if (intf->cur_altsetting->desc.bInterfaceProtocol ==
1317                         USB_INTERFACE_PROTOCOL_MOUSE)
1318                 hid->type = HID_TYPE_USBMOUSE;
1319         else if (intf->cur_altsetting->desc.bInterfaceProtocol == 0)
1320                 hid->type = HID_TYPE_USBNONE;
1321
1322         if (dev->manufacturer)
1323                 strlcpy(hid->name, dev->manufacturer, sizeof(hid->name));
1324
1325         if (dev->product) {
1326                 if (dev->manufacturer)
1327                         strlcat(hid->name, " ", sizeof(hid->name));
1328                 strlcat(hid->name, dev->product, sizeof(hid->name));
1329         }
1330
1331         if (!strlen(hid->name))
1332                 snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x",
1333                          le16_to_cpu(dev->descriptor.idVendor),
1334                          le16_to_cpu(dev->descriptor.idProduct));
1335
1336         usb_make_path(dev, hid->phys, sizeof(hid->phys));
1337         strlcat(hid->phys, "/input", sizeof(hid->phys));
1338         len = strlen(hid->phys);
1339         if (len < sizeof(hid->phys) - 1)
1340                 snprintf(hid->phys + len, sizeof(hid->phys) - len,
1341                          "%d", intf->altsetting[0].desc.bInterfaceNumber);
1342
1343         if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
1344                 hid->uniq[0] = 0;
1345
1346         usbhid = kzalloc(sizeof(*usbhid), GFP_KERNEL);
1347         if (usbhid == NULL) {
1348                 ret = -ENOMEM;
1349                 goto err;
1350         }
1351
1352         hid->driver_data = usbhid;
1353         usbhid->hid = hid;
1354         usbhid->intf = intf;
1355         usbhid->ifnum = interface->desc.bInterfaceNumber;
1356
1357         init_waitqueue_head(&usbhid->wait);
1358         INIT_WORK(&usbhid->reset_work, hid_reset);
1359         setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);
1360         spin_lock_init(&usbhid->lock);
1361
1362         ret = hid_add_device(hid);
1363         if (ret) {
1364                 if (ret != -ENODEV)
1365                         hid_err(intf, "can't add hid device: %d\n", ret);
1366                 goto err_free;
1367         }
1368
1369         return 0;
1370 err_free:
1371         kfree(usbhid);
1372 err:
1373         hid_destroy_device(hid);
1374         return ret;
1375 }
1376
1377 static void usbhid_disconnect(struct usb_interface *intf)
1378 {
1379         struct hid_device *hid = usb_get_intfdata(intf);
1380         struct usbhid_device *usbhid;
1381
1382         if (WARN_ON(!hid))
1383                 return;
1384
1385         usbhid = hid->driver_data;
1386         spin_lock_irq(&usbhid->lock);   /* Sync with error and led handlers */
1387         set_bit(HID_DISCONNECTED, &usbhid->iofl);
1388         spin_unlock_irq(&usbhid->lock);
1389         hid_destroy_device(hid);
1390         kfree(usbhid);
1391 }
1392
1393 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
1394 {
1395         del_timer_sync(&usbhid->io_retry);
1396         cancel_work_sync(&usbhid->reset_work);
1397 }
1398
1399 static void hid_cease_io(struct usbhid_device *usbhid)
1400 {
1401         del_timer_sync(&usbhid->io_retry);
1402         usb_kill_urb(usbhid->urbin);
1403         usb_kill_urb(usbhid->urbctrl);
1404         usb_kill_urb(usbhid->urbout);
1405 }
1406
1407 /* Treat USB reset pretty much the same as suspend/resume */
1408 static int hid_pre_reset(struct usb_interface *intf)
1409 {
1410         struct hid_device *hid = usb_get_intfdata(intf);
1411         struct usbhid_device *usbhid = hid->driver_data;
1412
1413         spin_lock_irq(&usbhid->lock);
1414         set_bit(HID_RESET_PENDING, &usbhid->iofl);
1415         spin_unlock_irq(&usbhid->lock);
1416         hid_cease_io(usbhid);
1417
1418         return 0;
1419 }
1420
1421 /* Same routine used for post_reset and reset_resume */
1422 static int hid_post_reset(struct usb_interface *intf)
1423 {
1424         struct usb_device *dev = interface_to_usbdev (intf);
1425         struct hid_device *hid = usb_get_intfdata(intf);
1426         struct usbhid_device *usbhid = hid->driver_data;
1427         struct usb_host_interface *interface = intf->cur_altsetting;
1428         int status;
1429         char *rdesc;
1430
1431         /* Fetch and examine the HID report descriptor. If this
1432          * has changed, then rebind. Since usbcore's check of the
1433          * configuration descriptors passed, we already know that
1434          * the size of the HID report descriptor has not changed.
1435          */
1436         rdesc = kmalloc(hid->dev_rsize, GFP_KERNEL);
1437         if (!rdesc) {
1438                 dbg_hid("couldn't allocate rdesc memory (post_reset)\n");
1439                 return 1;
1440         }
1441         status = hid_get_class_descriptor(dev,
1442                                 interface->desc.bInterfaceNumber,
1443                                 HID_DT_REPORT, rdesc, hid->dev_rsize);
1444         if (status < 0) {
1445                 dbg_hid("reading report descriptor failed (post_reset)\n");
1446                 kfree(rdesc);
1447                 return 1;
1448         }
1449         status = memcmp(rdesc, hid->dev_rdesc, hid->dev_rsize);
1450         kfree(rdesc);
1451         if (status != 0) {
1452                 dbg_hid("report descriptor changed\n");
1453                 return 1;
1454         }
1455
1456         spin_lock_irq(&usbhid->lock);
1457         clear_bit(HID_RESET_PENDING, &usbhid->iofl);
1458         spin_unlock_irq(&usbhid->lock);
1459         hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
1460         status = hid_start_in(hid);
1461         if (status < 0)
1462                 hid_io_error(hid);
1463         usbhid_restart_queues(usbhid);
1464
1465         return 0;
1466 }
1467
1468 int usbhid_get_power(struct hid_device *hid)
1469 {
1470         struct usbhid_device *usbhid = hid->driver_data;
1471
1472         return usb_autopm_get_interface(usbhid->intf);
1473 }
1474
1475 void usbhid_put_power(struct hid_device *hid)
1476 {
1477         struct usbhid_device *usbhid = hid->driver_data;
1478
1479         usb_autopm_put_interface(usbhid->intf);
1480 }
1481
1482
1483 #ifdef CONFIG_PM
1484 static int hid_resume_common(struct hid_device *hid, bool driver_suspended)
1485 {
1486         struct usbhid_device *usbhid = hid->driver_data;
1487         int status;
1488
1489         spin_lock_irq(&usbhid->lock);
1490         clear_bit(HID_SUSPENDED, &usbhid->iofl);
1491         usbhid_mark_busy(usbhid);
1492
1493         if (test_bit(HID_CLEAR_HALT, &usbhid->iofl) ||
1494                         test_bit(HID_RESET_PENDING, &usbhid->iofl))
1495                 schedule_work(&usbhid->reset_work);
1496         usbhid->retry_delay = 0;
1497
1498         usbhid_restart_queues(usbhid);
1499         spin_unlock_irq(&usbhid->lock);
1500
1501         status = hid_start_in(hid);
1502         if (status < 0)
1503                 hid_io_error(hid);
1504
1505         if (driver_suspended && hid->driver && hid->driver->resume)
1506                 status = hid->driver->resume(hid);
1507         return status;
1508 }
1509
1510 static int hid_suspend(struct usb_interface *intf, pm_message_t message)
1511 {
1512         struct hid_device *hid = usb_get_intfdata(intf);
1513         struct usbhid_device *usbhid = hid->driver_data;
1514         int status = 0;
1515         bool driver_suspended = false;
1516         unsigned int ledcount;
1517
1518         if (PMSG_IS_AUTO(message)) {
1519                 ledcount = hidinput_count_leds(hid);
1520                 spin_lock_irq(&usbhid->lock);   /* Sync with error handler */
1521                 if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
1522                     && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
1523                     && !test_bit(HID_OUT_RUNNING, &usbhid->iofl)
1524                     && !test_bit(HID_CTRL_RUNNING, &usbhid->iofl)
1525                     && !test_bit(HID_KEYS_PRESSED, &usbhid->iofl)
1526                     && (!ledcount || ignoreled))
1527                 {
1528                         set_bit(HID_SUSPENDED, &usbhid->iofl);
1529                         spin_unlock_irq(&usbhid->lock);
1530                         if (hid->driver && hid->driver->suspend) {
1531                                 status = hid->driver->suspend(hid, message);
1532                                 if (status < 0)
1533                                         goto failed;
1534                         }
1535                         driver_suspended = true;
1536                 } else {
1537                         usbhid_mark_busy(usbhid);
1538                         spin_unlock_irq(&usbhid->lock);
1539                         return -EBUSY;
1540                 }
1541
1542         } else {
1543                 /* TODO: resume() might need to handle suspend failure */
1544                 if (hid->driver && hid->driver->suspend)
1545                         status = hid->driver->suspend(hid, message);
1546                 driver_suspended = true;
1547                 spin_lock_irq(&usbhid->lock);
1548                 set_bit(HID_SUSPENDED, &usbhid->iofl);
1549                 spin_unlock_irq(&usbhid->lock);
1550                 if (usbhid_wait_io(hid) < 0)
1551                         status = -EIO;
1552         }
1553
1554         hid_cancel_delayed_stuff(usbhid);
1555         hid_cease_io(usbhid);
1556
1557         if (PMSG_IS_AUTO(message) && test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
1558                 /* lost race against keypresses */
1559                 status = -EBUSY;
1560                 goto failed;
1561         }
1562         dev_dbg(&intf->dev, "suspend\n");
1563         return status;
1564
1565  failed:
1566         hid_resume_common(hid, driver_suspended);
1567         return status;
1568 }
1569
1570 static int hid_resume(struct usb_interface *intf)
1571 {
1572         struct hid_device *hid = usb_get_intfdata (intf);
1573         struct usbhid_device *usbhid = hid->driver_data;
1574         int status;
1575
1576         if (!test_bit(HID_STARTED, &usbhid->iofl))
1577                 return 0;
1578
1579         status = hid_resume_common(hid, true);
1580         dev_dbg(&intf->dev, "resume status %d\n", status);
1581         return 0;
1582 }
1583
1584 static int hid_reset_resume(struct usb_interface *intf)
1585 {
1586         struct hid_device *hid = usb_get_intfdata(intf);
1587         struct usbhid_device *usbhid = hid->driver_data;
1588         int status;
1589
1590         clear_bit(HID_SUSPENDED, &usbhid->iofl);
1591         status = hid_post_reset(intf);
1592         if (status >= 0 && hid->driver && hid->driver->reset_resume) {
1593                 int ret = hid->driver->reset_resume(hid);
1594                 if (ret < 0)
1595                         status = ret;
1596         }
1597         return status;
1598 }
1599
1600 #endif /* CONFIG_PM */
1601
1602 static const struct usb_device_id hid_usb_ids[] = {
1603         { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
1604                 .bInterfaceClass = USB_INTERFACE_CLASS_HID },
1605         { }                                             /* Terminating entry */
1606 };
1607
1608 MODULE_DEVICE_TABLE (usb, hid_usb_ids);
1609
1610 static struct usb_driver hid_driver = {
1611         .name =         "usbhid",
1612         .probe =        usbhid_probe,
1613         .disconnect =   usbhid_disconnect,
1614 #ifdef CONFIG_PM
1615         .suspend =      hid_suspend,
1616         .resume =       hid_resume,
1617         .reset_resume = hid_reset_resume,
1618 #endif
1619         .pre_reset =    hid_pre_reset,
1620         .post_reset =   hid_post_reset,
1621         .id_table =     hid_usb_ids,
1622         .supports_autosuspend = 1,
1623 };
1624
1625 struct usb_interface *usbhid_find_interface(int minor)
1626 {
1627         return usb_find_interface(&hid_driver, minor);
1628 }
1629
1630 static int __init hid_init(void)
1631 {
1632         int retval = -ENOMEM;
1633
1634         retval = usbhid_quirks_init(quirks_param);
1635         if (retval)
1636                 goto usbhid_quirks_init_fail;
1637         retval = usb_register(&hid_driver);
1638         if (retval)
1639                 goto usb_register_fail;
1640         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
1641
1642         return 0;
1643 usb_register_fail:
1644         usbhid_quirks_exit();
1645 usbhid_quirks_init_fail:
1646         return retval;
1647 }
1648
1649 static void __exit hid_exit(void)
1650 {
1651         usb_deregister(&hid_driver);
1652         usbhid_quirks_exit();
1653 }
1654
1655 module_init(hid_init);
1656 module_exit(hid_exit);
1657
1658 MODULE_AUTHOR("Andreas Gal");
1659 MODULE_AUTHOR("Vojtech Pavlik");
1660 MODULE_AUTHOR("Jiri Kosina");
1661 MODULE_DESCRIPTION(DRIVER_DESC);
1662 MODULE_LICENSE(DRIVER_LICENSE);