drivers/hid/usbhid/hid-core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  USB HID support for Linux
   4  *
   5  *  Copyright (c) 1999 Andreas Gal
   6  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   7  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   8  *  Copyright (c) 2007-2008 Oliver Neukum
   9  *  Copyright (c) 2006-2010 Jiri Kosina
  10  */
  11
  12 /*
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/init.h>
  18 #include <linux/kernel.h>
  19 #include <linux/list.h>
  20 #include <linux/mm.h>
  21 #include <linux/mutex.h>
  22 #include <linux/spinlock.h>
  23 #include <asm/unaligned.h>
  24 #include <asm/byteorder.h>
  25 #include <linux/input.h>
  26 #include <linux/wait.h>
  27 #include <linux/workqueue.h>
  28 #include <linux/string.h>
  29
  30 #include <linux/usb.h>
  31
  32 #include <linux/hid.h>
  33 #include <linux/hiddev.h>
  34 #include <linux/hid-debug.h>
  35 #include <linux/hidraw.h>
  36 #include "usbhid.h"
  37
  38 /*
  39  * Version Information
  40  */
  41
  42 #define DRIVER_DESC "USB HID core driver"
  43
  44 /*
  45  * Module parameters.
  46  */
  47
  48 static unsigned int hid_mousepoll_interval;
  49 module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
  50 MODULE_PARM_DESC(mousepoll, "Polling interval of mice");
  51
  52 static unsigned int hid_jspoll_interval;
  53 module_param_named(jspoll, hid_jspoll_interval, uint, 0644);
  54 MODULE_PARM_DESC(jspoll, "Polling interval of joysticks");
  55
  56 static unsigned int hid_kbpoll_interval;
  57 module_param_named(kbpoll, hid_kbpoll_interval, uint, 0644);
  58 MODULE_PARM_DESC(kbpoll, "Polling interval of keyboards");
  59
  60 static unsigned int ignoreled;
  61 module_param_named(ignoreled, ignoreled, uint, 0644);
  62 MODULE_PARM_DESC(ignoreled, "Autosuspend with active leds");
  63
  64 /* Quirks specified at module load time */
  65 static char *quirks_param[MAX_USBHID_BOOT_QUIRKS];
  66 module_param_array_named(quirks, quirks_param, charp, NULL, 0444);
  67 MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying "
  68                 " quirks=vendorID:productID:quirks"
  69                 " where vendorID, productID, and quirks are all in"
  70                 " 0x-prefixed hex");
  71 /*
  72  * Input submission and I/O error handler.
  73  */
  74 static void hid_io_error(struct hid_device *hid);
  75 static int hid_submit_out(struct hid_device *hid);
  76 static int hid_submit_ctrl(struct hid_device *hid);
  77 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid);
  78
  79 /* Start up the input URB */
  80 static int hid_start_in(struct hid_device *hid)
  81 {
  82         unsigned long flags;
  83         int rc = 0;
  84         struct usbhid_device *usbhid = hid->driver_data;
  85
  86         spin_lock_irqsave(&usbhid->lock, flags);
  87         if (test_bit(HID_IN_POLLING, &usbhid->iofl) &&
  88             !test_bit(HID_DISCONNECTED, &usbhid->iofl) &&
  89             !test_bit(HID_SUSPENDED, &usbhid->iofl) &&
  90             !test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) {
  91                 rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC);
  92                 if (rc != 0) {
  93                         clear_bit(HID_IN_RUNNING, &usbhid->iofl);
  94                         if (rc == -ENOSPC)
  95                                 set_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
  96                 } else {
  97                         clear_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
  98                 }
  99         }
 100         spin_unlock_irqrestore(&usbhid->lock, flags);
 101         return rc;
 102 }
 103
 104 /* I/O retry timer routine */
 105 static void hid_retry_timeout(struct timer_list *t)
 106 {
 107         struct usbhid_device *usbhid = from_timer(usbhid, t, io_retry);
 108         struct hid_device *hid = usbhid->hid;
 109
 110         dev_dbg(&usbhid->intf->dev, "retrying intr urb\n");
 111         if (hid_start_in(hid))
 112                 hid_io_error(hid);
 113 }
 114
 115 /* Workqueue routine to reset the device or clear a halt */
 116 static void hid_reset(struct work_struct *work)
 117 {
 118         struct usbhid_device *usbhid =
 119                 container_of(work, struct usbhid_device, reset_work);
 120         struct hid_device *hid = usbhid->hid;
 121         int rc;
 122
 123         if (test_bit(HID_CLEAR_HALT, &usbhid->iofl)) {
 124                 dev_dbg(&usbhid->intf->dev, "clear halt\n");
 125                 rc = usb_clear_halt(hid_to_usb_dev(hid), usbhid->urbin->pipe);
 126                 clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
 127                 if (rc == 0) {
 128                         hid_start_in(hid);
 129                 } else {
 130                         dev_dbg(&usbhid->intf->dev,
 131                                         "clear-halt failed: %d\n", rc);
 132                         set_bit(HID_RESET_PENDING, &usbhid->iofl);
 133                 }
 134         }
 135
 136         if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) {
 137                 dev_dbg(&usbhid->intf->dev, "resetting device\n");
 138                 usb_queue_reset_device(usbhid->intf);
 139         }
 140 }
 141
 142 /* Main I/O error handler */
 143 static void hid_io_error(struct hid_device *hid)
 144 {
 145         unsigned long flags;
 146         struct usbhid_device *usbhid = hid->driver_data;
 147
 148         spin_lock_irqsave(&usbhid->lock, flags);
 149
 150         /* Stop when disconnected */
 151         if (test_bit(HID_DISCONNECTED, &usbhid->iofl))
 152                 goto done;
 153
 154         /* If it has been a while since the last error, we'll assume
 155          * this a brand new error and reset the retry timeout. */
 156         if (time_after(jiffies, usbhid->stop_retry + HZ/2))
 157                 usbhid->retry_delay = 0;
 158
 159         /* When an error occurs, retry at increasing intervals */
 160         if (usbhid->retry_delay == 0) {
 161                 usbhid->retry_delay = 13;       /* Then 26, 52, 104, 104, ... */
 162                 usbhid->stop_retry = jiffies + msecs_to_jiffies(1000);
 163         } else if (usbhid->retry_delay < 100)
 164                 usbhid->retry_delay *= 2;
 165
 166         if (time_after(jiffies, usbhid->stop_retry)) {
 167
 168                 /* Retries failed, so do a port reset unless we lack bandwidth*/
 169                 if (!test_bit(HID_NO_BANDWIDTH, &usbhid->iofl)
 170                      && !test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
 171
 172                         schedule_work(&usbhid->reset_work);
 173                         goto done;
 174                 }
 175         }
 176
 177         mod_timer(&usbhid->io_retry,
 178                         jiffies + msecs_to_jiffies(usbhid->retry_delay));
 179 done:
 180         spin_unlock_irqrestore(&usbhid->lock, flags);
 181 }
 182
 183 static void usbhid_mark_busy(struct usbhid_device *usbhid)
 184 {
 185         struct usb_interface *intf = usbhid->intf;
 186
 187         usb_mark_last_busy(interface_to_usbdev(intf));
 188 }
 189
 190 static int usbhid_restart_out_queue(struct usbhid_device *usbhid)
 191 {
 192         struct hid_device *hid = usb_get_intfdata(usbhid->intf);
 193         int kicked;
 194         int r;
 195
 196         if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
 197                         test_bit(HID_SUSPENDED, &usbhid->iofl))
 198                 return 0;
 199
 200         if ((kicked = (usbhid->outhead != usbhid->outtail))) {
 201                 hid_dbg(hid, "Kicking head %d tail %d", usbhid->outhead, usbhid->outtail);
 202
 203                 /* Try to wake up from autosuspend... */
 204                 r = usb_autopm_get_interface_async(usbhid->intf);
 205                 if (r < 0)
 206                         return r;
 207
 208                 /*
 209                  * If still suspended, don't submit.  Submission will
 210                  * occur if/when resume drains the queue.
 211                  */
 212                 if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
 213                         usb_autopm_put_interface_no_suspend(usbhid->intf);
 214                         return r;
 215                 }
 216
 217                 /* Asynchronously flush queue. */
 218                 set_bit(HID_OUT_RUNNING, &usbhid->iofl);
 219                 if (hid_submit_out(hid)) {
 220                         clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
 221                         usb_autopm_put_interface_async(usbhid->intf);
 222                 }
 223                 wake_up(&usbhid->wait);
 224         }
 225         return kicked;
 226 }
 227
 228 static int usbhid_restart_ctrl_queue(struct usbhid_device *usbhid)
 229 {
 230         struct hid_device *hid = usb_get_intfdata(usbhid->intf);
 231         int kicked;
 232         int r;
 233
 234         WARN_ON(hid == NULL);
 235         if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
 236                         test_bit(HID_SUSPENDED, &usbhid->iofl))
 237                 return 0;
 238
 239         if ((kicked = (usbhid->ctrlhead != usbhid->ctrltail))) {
 240                 hid_dbg(hid, "Kicking head %d tail %d", usbhid->ctrlhead, usbhid->ctrltail);
 241
 242                 /* Try to wake up from autosuspend... */
 243                 r = usb_autopm_get_interface_async(usbhid->intf);
 244                 if (r < 0)
 245                         return r;
 246
 247                 /*
 248                  * If still suspended, don't submit.  Submission will
 249                  * occur if/when resume drains the queue.
 250                  */
 251                 if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
 252                         usb_autopm_put_interface_no_suspend(usbhid->intf);
 253                         return r;
 254                 }
 255
 256                 /* Asynchronously flush queue. */
 257                 set_bit(HID_CTRL_RUNNING, &usbhid->iofl);
 258                 if (hid_submit_ctrl(hid)) {
 259                         clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
 260                         usb_autopm_put_interface_async(usbhid->intf);
 261                 }
 262                 wake_up(&usbhid->wait);
 263         }
 264         return kicked;
 265 }
 266
 267 /*
 268  * Input interrupt completion handler.
 269  */
 270
 271 static void hid_irq_in(struct urb *urb)
 272 {
 273         struct hid_device       *hid = urb->context;
 274         struct usbhid_device    *usbhid = hid->driver_data;
 275         int                     status;
 276
 277         switch (urb->status) {
 278         case 0:                 /* success */
 279                 usbhid->retry_delay = 0;
 280                 if (!test_bit(HID_OPENED, &usbhid->iofl))
 281                         break;
 282                 usbhid_mark_busy(usbhid);
 283                 if (!test_bit(HID_RESUME_RUNNING, &usbhid->iofl)) {
 284                         hid_input_report(urb->context, HID_INPUT_REPORT,
 285                                          urb->transfer_buffer,
 286                                          urb->actual_length, 1);
 287                         /*
 288                          * autosuspend refused while keys are pressed
 289                          * because most keyboards don't wake up when
 290                          * a key is released
 291                          */
 292                         if (hid_check_keys_pressed(hid))
 293                                 set_bit(HID_KEYS_PRESSED, &usbhid->iofl);
 294                         else
 295                                 clear_bit(HID_KEYS_PRESSED, &usbhid->iofl);
 296                 }
 297                 break;
 298         case -EPIPE:            /* stall */
 299                 usbhid_mark_busy(usbhid);
 300                 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
 301                 set_bit(HID_CLEAR_HALT, &usbhid->iofl);
 302                 schedule_work(&usbhid->reset_work);
 303                 return;
 304         case -ECONNRESET:       /* unlink */
 305         case -ENOENT:
 306         case -ESHUTDOWN:        /* unplug */
 307                 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
 308                 return;
 309         case -EILSEQ:           /* protocol error or unplug */
 310         case -EPROTO:           /* protocol error or unplug */
 311         case -ETIME:            /* protocol error or unplug */
 312         case -ETIMEDOUT:        /* Should never happen, but... */
 313                 usbhid_mark_busy(usbhid);
 314                 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
 315                 hid_io_error(hid);
 316                 return;
 317         default:                /* error */
 318                 hid_warn(urb->dev, "input irq status %d received\n",
 319                          urb->status);
 320         }
 321
 322         status = usb_submit_urb(urb, GFP_ATOMIC);
 323         if (status) {
 324                 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
 325                 if (status != -EPERM) {
 326                         hid_err(hid, "can't resubmit intr, %s-%s/input%d, status %d\n",
 327                                 hid_to_usb_dev(hid)->bus->bus_name,
 328                                 hid_to_usb_dev(hid)->devpath,
 329                                 usbhid->ifnum, status);
 330                         hid_io_error(hid);
 331                 }
 332         }
 333 }
 334
 335 static int hid_submit_out(struct hid_device *hid)
 336 {
 337         struct hid_report *report;
 338         char *raw_report;
 339         struct usbhid_device *usbhid = hid->driver_data;
 340         int r;
 341
 342         report = usbhid->out[usbhid->outtail].report;
 343         raw_report = usbhid->out[usbhid->outtail].raw_report;
 344
 345         usbhid->urbout->transfer_buffer_length = hid_report_len(report);
 346         usbhid->urbout->dev = hid_to_usb_dev(hid);
 347         if (raw_report) {
 348                 memcpy(usbhid->outbuf, raw_report,
 349                                 usbhid->urbout->transfer_buffer_length);
 350                 kfree(raw_report);
 351                 usbhid->out[usbhid->outtail].raw_report = NULL;
 352         }
 353
 354         dbg_hid("submitting out urb\n");
 355
 356         r = usb_submit_urb(usbhid->urbout, GFP_ATOMIC);
 357         if (r < 0) {
 358                 hid_err(hid, "usb_submit_urb(out) failed: %d\n", r);
 359                 return r;
 360         }
 361         usbhid->last_out = jiffies;
 362         return 0;
 363 }
 364
 365 static int hid_submit_ctrl(struct hid_device *hid)
 366 {
 367         struct hid_report *report;
 368         unsigned char dir;
 369         char *raw_report;
 370         int len, r;
 371         struct usbhid_device *usbhid = hid->driver_data;
 372
 373         report = usbhid->ctrl[usbhid->ctrltail].report;
 374         raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;
 375         dir = usbhid->ctrl[usbhid->ctrltail].dir;
 376
 377         len = hid_report_len(report);
 378         if (dir == USB_DIR_OUT) {
 379                 usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
 380                 if (raw_report) {
 381                         memcpy(usbhid->ctrlbuf, raw_report, len);
 382                         kfree(raw_report);
 383                         usbhid->ctrl[usbhid->ctrltail].raw_report = NULL;
 384                 }
 385         } else {
 386                 int maxpacket;
 387
 388                 usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
 389                 maxpacket = usb_maxpacket(hid_to_usb_dev(hid),
 390                                           usbhid->urbctrl->pipe, 0);
 391                 if (maxpacket > 0) {
 392                         len += (len == 0);    /* Don't allow 0-length reports */
 393                         len = DIV_ROUND_UP(len, maxpacket);
 394                         len *= maxpacket;
 395                         if (len > usbhid->bufsize)
 396                                 len = usbhid->bufsize;
 397                 } else
 398                         len = 0;
 399         }
 400         usbhid->urbctrl->transfer_buffer_length = len;
 401         usbhid->urbctrl->dev = hid_to_usb_dev(hid);
 402
 403         usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
 404         usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT :
 405                                                       HID_REQ_GET_REPORT;
 406         usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) |
 407                                          report->id);
 408         usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
 409         usbhid->cr->wLength = cpu_to_le16(len);
 410
 411         dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n",
 412                 usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" :
 413                                                              "Get_Report",
 414                 usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);
 415
 416         r = usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC);
 417         if (r < 0) {
 418                 hid_err(hid, "usb_submit_urb(ctrl) failed: %d\n", r);
 419                 return r;
 420         }
 421         usbhid->last_ctrl = jiffies;
 422         return 0;
 423 }
 424
 425 /*
 426  * Output interrupt completion handler.
 427  */
 428
 429 static void hid_irq_out(struct urb *urb)
 430 {
 431         struct hid_device *hid = urb->context;
 432         struct usbhid_device *usbhid = hid->driver_data;
 433         unsigned long flags;
 434         int unplug = 0;
 435
 436         switch (urb->status) {
 437         case 0:                 /* success */
 438                 break;
 439         case -ESHUTDOWN:        /* unplug */
 440                 unplug = 1;
 441                 break;
 442         case -EILSEQ:           /* protocol error or unplug */
 443         case -EPROTO:           /* protocol error or unplug */
 444         case -ECONNRESET:       /* unlink */
 445         case -ENOENT:
 446                 break;
 447         default:                /* error */
 448                 hid_warn(urb->dev, "output irq status %d received\n",
 449                          urb->status);
 450         }
 451
 452         spin_lock_irqsave(&usbhid->lock, flags);
 453
 454         if (unplug) {
 455                 usbhid->outtail = usbhid->outhead;
 456         } else {
 457                 usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1);
 458
 459                 if (usbhid->outhead != usbhid->outtail &&
 460                                 hid_submit_out(hid) == 0) {
 461                         /* Successfully submitted next urb in queue */
 462                         spin_unlock_irqrestore(&usbhid->lock, flags);
 463                         return;
 464                 }
 465         }
 466
 467         clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
 468         spin_unlock_irqrestore(&usbhid->lock, flags);
 469         usb_autopm_put_interface_async(usbhid->intf);
 470         wake_up(&usbhid->wait);
 471 }
 472
 473 /*
 474  * Control pipe completion handler.
 475  */
 476
 477 static void hid_ctrl(struct urb *urb)
 478 {
 479         struct hid_device *hid = urb->context;
 480         struct usbhid_device *usbhid = hid->driver_data;
 481         unsigned long flags;
 482         int unplug = 0, status = urb->status;
 483
 484         switch (status) {
 485         case 0:                 /* success */
 486                 if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN)
 487                         hid_input_report(urb->context,
 488                                 usbhid->ctrl[usbhid->ctrltail].report->type,
 489                                 urb->transfer_buffer, urb->actual_length, 0);
 490                 break;
 491         case -ESHUTDOWN:        /* unplug */
 492                 unplug = 1;
 493                 break;
 494         case -EILSEQ:           /* protocol error or unplug */
 495         case -EPROTO:           /* protocol error or unplug */
 496         case -ECONNRESET:       /* unlink */
 497         case -ENOENT:
 498         case -EPIPE:            /* report not available */
 499                 break;
 500         default:                /* error */
 501                 hid_warn(urb->dev, "ctrl urb status %d received\n", status);
 502         }
 503
 504         spin_lock_irqsave(&usbhid->lock, flags);
 505
 506         if (unplug) {
 507                 usbhid->ctrltail = usbhid->ctrlhead;
 508         } else if (usbhid->ctrlhead != usbhid->ctrltail) {
 509                 usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
 510
 511                 if (usbhid->ctrlhead != usbhid->ctrltail &&
 512                                 hid_submit_ctrl(hid) == 0) {
 513                         /* Successfully submitted next urb in queue */
 514                         spin_unlock_irqrestore(&usbhid->lock, flags);
 515                         return;
 516                 }
 517         }
 518
 519         clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
 520         spin_unlock_irqrestore(&usbhid->lock, flags);
 521         usb_autopm_put_interface_async(usbhid->intf);
 522         wake_up(&usbhid->wait);
 523 }
 524
 525 static void __usbhid_submit_report(struct hid_device *hid, struct hid_report *report,
 526                                    unsigned char dir)
 527 {
 528         int head;
 529         struct usbhid_device *usbhid = hid->driver_data;
 530
 531         if (((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN) ||
 532                 test_bit(HID_DISCONNECTED, &usbhid->iofl))
 533                 return;
 534
 535         if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {
 536                 if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) {
 537                         hid_warn(hid, "output queue full\n");
 538                         return;
 539                 }
 540
 541                 usbhid->out[usbhid->outhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
 542                 if (!usbhid->out[usbhid->outhead].raw_report) {
 543                         hid_warn(hid, "output queueing failed\n");
 544                         return;
 545                 }
 546                 hid_output_report(report, usbhid->out[usbhid->outhead].raw_report);
 547                 usbhid->out[usbhid->outhead].report = report;
 548                 usbhid->outhead = head;
 549
 550                 /* If the queue isn't running, restart it */
 551                 if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl)) {
 552                         usbhid_restart_out_queue(usbhid);
 553
 554                 /* Otherwise see if an earlier request has timed out */
 555                 } else if (time_after(jiffies, usbhid->last_out + HZ * 5)) {
 556
 557                         /* Prevent autosuspend following the unlink */
 558                         usb_autopm_get_interface_no_resume(usbhid->intf);
 559
 560                         /*
 561                          * Prevent resubmission in case the URB completes
 562                          * before we can unlink it.  We don't want to cancel
 563                          * the wrong transfer!
 564                          */
 565                         usb_block_urb(usbhid->urbout);
 566
 567                         /* Drop lock to avoid deadlock if the callback runs */
 568                         spin_unlock(&usbhid->lock);
 569
 570                         usb_unlink_urb(usbhid->urbout);
 571                         spin_lock(&usbhid->lock);
 572                         usb_unblock_urb(usbhid->urbout);
 573
 574                         /* Unlink might have stopped the queue */
 575                         if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl))
 576                                 usbhid_restart_out_queue(usbhid);
 577
 578                         /* Now we can allow autosuspend again */
 579                         usb_autopm_put_interface_async(usbhid->intf);
 580                 }
 581                 return;
 582         }
 583
 584         if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
 585                 hid_warn(hid, "control queue full\n");
 586                 return;
 587         }
 588
 589         if (dir == USB_DIR_OUT) {
 590                 usbhid->ctrl[usbhid->ctrlhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
 591                 if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) {
 592                         hid_warn(hid, "control queueing failed\n");
 593                         return;
 594                 }
 595                 hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report);
 596         }
 597         usbhid->ctrl[usbhid->ctrlhead].report = report;
 598         usbhid->ctrl[usbhid->ctrlhead].dir = dir;
 599         usbhid->ctrlhead = head;
 600
 601         /* If the queue isn't running, restart it */
 602         if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) {
 603                 usbhid_restart_ctrl_queue(usbhid);
 604
 605         /* Otherwise see if an earlier request has timed out */
 606         } else if (time_after(jiffies, usbhid->last_ctrl + HZ * 5)) {
 607
 608                 /* Prevent autosuspend following the unlink */
 609                 usb_autopm_get_interface_no_resume(usbhid->intf);
 610
 611                 /*
 612                  * Prevent resubmission in case the URB completes
 613                  * before we can unlink it.  We don't want to cancel
 614                  * the wrong transfer!
 615                  */
 616                 usb_block_urb(usbhid->urbctrl);
 617
 618                 /* Drop lock to avoid deadlock if the callback runs */
 619                 spin_unlock(&usbhid->lock);
 620
 621                 usb_unlink_urb(usbhid->urbctrl);
 622                 spin_lock(&usbhid->lock);
 623                 usb_unblock_urb(usbhid->urbctrl);
 624
 625                 /* Unlink might have stopped the queue */
 626                 if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
 627                         usbhid_restart_ctrl_queue(usbhid);
 628
 629                 /* Now we can allow autosuspend again */
 630                 usb_autopm_put_interface_async(usbhid->intf);
 631         }
 632 }
 633
 634 static void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
 635 {
 636         struct usbhid_device *usbhid = hid->driver_data;
 637         unsigned long flags;
 638
 639         spin_lock_irqsave(&usbhid->lock, flags);
 640         __usbhid_submit_report(hid, report, dir);
 641         spin_unlock_irqrestore(&usbhid->lock, flags);
 642 }
 643
 644 static int usbhid_wait_io(struct hid_device *hid)
 645 {
 646         struct usbhid_device *usbhid = hid->driver_data;
 647
 648         if (!wait_event_timeout(usbhid->wait,
 649                                 (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
 650                                 !test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
 651                                         10*HZ)) {
 652                 dbg_hid("timeout waiting for ctrl or out queue to clear\n");
 653                 return -1;
 654         }
 655
 656         return 0;
 657 }
 658
 659 static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
 660 {
 661         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 662                 HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report,
 663                 ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
 664 }
 665
 666 static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
 667                 unsigned char type, void *buf, int size)
 668 {
 669         int result, retries = 4;
 670
 671         memset(buf, 0, size);
 672
 673         do {
 674                 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 675                                 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
 676                                 (type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT);
 677                 retries--;
 678         } while (result < size && retries);
 679         return result;
 680 }
 681
 682 static int usbhid_open(struct hid_device *hid)
 683 {
 684         struct usbhid_device *usbhid = hid->driver_data;
 685         int res;
 686
 687         mutex_lock(&usbhid->mutex);
 688
 689         set_bit(HID_OPENED, &usbhid->iofl);
 690
 691         if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
 692                 res = 0;
 693                 goto Done;
 694         }
 695
 696         res = usb_autopm_get_interface(usbhid->intf);
 697         /* the device must be awake to reliably request remote wakeup */
 698         if (res < 0) {
 699                 clear_bit(HID_OPENED, &usbhid->iofl);
 700                 res = -EIO;
 701                 goto Done;
 702         }
 703
 704         usbhid->intf->needs_remote_wakeup = 1;
 705
 706         set_bit(HID_RESUME_RUNNING, &usbhid->iofl);
 707         set_bit(HID_IN_POLLING, &usbhid->iofl);
 708
 709         res = hid_start_in(hid);
 710         if (res) {
 711                 if (res != -ENOSPC) {
 712                         hid_io_error(hid);
 713                         res = 0;
 714                 } else {
 715                         /* no use opening if resources are insufficient */
 716                         res = -EBUSY;
 717                         clear_bit(HID_OPENED, &usbhid->iofl);
 718                         clear_bit(HID_IN_POLLING, &usbhid->iofl);
 719                         usbhid->intf->needs_remote_wakeup = 0;
 720                 }
 721         }
 722
 723         usb_autopm_put_interface(usbhid->intf);
 724
 725         /*
 726          * In case events are generated while nobody was listening,
 727          * some are released when the device is re-opened.
 728          * Wait 50 msec for the queue to empty before allowing events
 729          * to go through hid.
 730          */
 731         if (res == 0)
 732                 msleep(50);
 733
 734         clear_bit(HID_RESUME_RUNNING, &usbhid->iofl);
 735
 736  Done:
 737         mutex_unlock(&usbhid->mutex);
 738         return res;
 739 }
 740
 741 static void usbhid_close(struct hid_device *hid)
 742 {
 743         struct usbhid_device *usbhid = hid->driver_data;
 744
 745         mutex_lock(&usbhid->mutex);
 746
 747         /*
 748          * Make sure we don't restart data acquisition due to
 749          * a resumption we no longer care about by avoiding racing
 750          * with hid_start_in().
 751          */
 752         spin_lock_irq(&usbhid->lock);
 753         clear_bit(HID_OPENED, &usbhid->iofl);
 754         if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL))
 755                 clear_bit(HID_IN_POLLING, &usbhid->iofl);
 756         spin_unlock_irq(&usbhid->lock);
 757
 758         if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL)) {
 759                 hid_cancel_delayed_stuff(usbhid);
 760                 usb_kill_urb(usbhid->urbin);
 761                 usbhid->intf->needs_remote_wakeup = 0;
 762         }
 763
 764         mutex_unlock(&usbhid->mutex);
 765 }
 766
 767 /*
 768  * Initialize all reports
 769  */
 770
 771 void usbhid_init_reports(struct hid_device *hid)
 772 {
 773         struct hid_report *report;
 774         struct usbhid_device *usbhid = hid->driver_data;
 775         struct hid_report_enum *report_enum;
 776         int err, ret;
 777
 778         report_enum = &hid->report_enum[HID_INPUT_REPORT];
 779         list_for_each_entry(report, &report_enum->report_list, list)
 780                 usbhid_submit_report(hid, report, USB_DIR_IN);
 781
 782         report_enum = &hid->report_enum[HID_FEATURE_REPORT];
 783         list_for_each_entry(report, &report_enum->report_list, list)
 784                 usbhid_submit_report(hid, report, USB_DIR_IN);
 785
 786         err = 0;
 787         ret = usbhid_wait_io(hid);
 788         while (ret) {
 789                 err |= ret;
 790                 if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
 791                         usb_kill_urb(usbhid->urbctrl);
 792                 if (test_bit(HID_OUT_RUNNING, &usbhid->iofl))
 793                         usb_kill_urb(usbhid->urbout);
 794                 ret = usbhid_wait_io(hid);
 795         }
 796
 797         if (err)
 798                 hid_warn(hid, "timeout initializing reports\n");
 799 }
 800
 801 /*
 802  * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
 803  */
 804 static int hid_find_field_early(struct hid_device *hid, unsigned int page,
 805     unsigned int hid_code, struct hid_field **pfield)
 806 {
 807         struct hid_report *report;
 808         struct hid_field *field;
 809         struct hid_usage *usage;
 810         int i, j;
 811
 812         list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
 813                 for (i = 0; i < report->maxfield; i++) {
 814                         field = report->field[i];
 815                         for (j = 0; j < field->maxusage; j++) {
 816                                 usage = &field->usage[j];
 817                                 if ((usage->hid & HID_USAGE_PAGE) == page &&
 818                                     (usage->hid & 0xFFFF) == hid_code) {
 819                                         *pfield = field;
 820                                         return j;
 821                                 }
 822                         }
 823                 }
 824         }
 825         return -1;
 826 }
 827
 828 static void usbhid_set_leds(struct hid_device *hid)
 829 {
 830         struct hid_field *field;
 831         int offset;
 832
 833         if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) {
 834                 hid_set_field(field, offset, 0);
 835                 usbhid_submit_report(hid, field->report, USB_DIR_OUT);
 836         }
 837 }
 838
 839 /*
 840  * Traverse the supplied list of reports and find the longest
 841  */
 842 static void hid_find_max_report(struct hid_device *hid, unsigned int type,
 843                 unsigned int *max)
 844 {
 845         struct hid_report *report;
 846         unsigned int size;
 847
 848         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
 849                 size = ((report->size - 1) >> 3) + 1 + hid->report_enum[type].numbered;
 850                 if (*max < size)
 851                         *max = size;
 852         }
 853 }
 854
 855 static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
 856 {
 857         struct usbhid_device *usbhid = hid->driver_data;
 858
 859         usbhid->inbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
 860                         &usbhid->inbuf_dma);
 861         usbhid->outbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
 862                         &usbhid->outbuf_dma);
 863         usbhid->cr = kmalloc(sizeof(*usbhid->cr), GFP_KERNEL);
 864         usbhid->ctrlbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
 865                         &usbhid->ctrlbuf_dma);
 866         if (!usbhid->inbuf || !usbhid->outbuf || !usbhid->cr ||
 867                         !usbhid->ctrlbuf)
 868                 return -1;
 869
 870         return 0;
 871 }
 872
 873 static int usbhid_get_raw_report(struct hid_device *hid,
 874                 unsigned char report_number, __u8 *buf, size_t count,
 875                 unsigned char report_type)
 876 {
 877         struct usbhid_device *usbhid = hid->driver_data;
 878         struct usb_device *dev = hid_to_usb_dev(hid);
 879         struct usb_interface *intf = usbhid->intf;
 880         struct usb_host_interface *interface = intf->cur_altsetting;
 881         int skipped_report_id = 0;
 882         int ret;
 883
 884         /* Byte 0 is the report number. Report data starts at byte 1.*/
 885         buf[0] = report_number;
 886         if (report_number == 0x0) {
 887                 /* Offset the return buffer by 1, so that the report ID
 888                    will remain in byte 0. */
 889                 buf++;
 890                 count--;
 891                 skipped_report_id = 1;
 892         }
 893         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 894                 HID_REQ_GET_REPORT,
 895                 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 896                 ((report_type + 1) << 8) | report_number,
 897                 interface->desc.bInterfaceNumber, buf, count,
 898                 USB_CTRL_SET_TIMEOUT);
 899
 900         /* count also the report id */
 901         if (ret > 0 && skipped_report_id)
 902                 ret++;
 903
 904         return ret;
 905 }
 906
 907 static int usbhid_set_raw_report(struct hid_device *hid, unsigned int reportnum,
 908                                  __u8 *buf, size_t count, unsigned char rtype)
 909 {
 910         struct usbhid_device *usbhid = hid->driver_data;
 911         struct usb_device *dev = hid_to_usb_dev(hid);
 912         struct usb_interface *intf = usbhid->intf;
 913         struct usb_host_interface *interface = intf->cur_altsetting;
 914         int ret, skipped_report_id = 0;
 915
 916         /* Byte 0 is the report number. Report data starts at byte 1.*/
 917         if ((rtype == HID_OUTPUT_REPORT) &&
 918             (hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORT_ID))
 919                 buf[0] = 0;
 920         else
 921                 buf[0] = reportnum;
 922
 923         if (buf[0] == 0x0) {
 924                 /* Don't send the Report ID */
 925                 buf++;
 926                 count--;
 927                 skipped_report_id = 1;
 928         }
 929
 930         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 931                         HID_REQ_SET_REPORT,
 932                         USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 933                         ((rtype + 1) << 8) | reportnum,
 934                         interface->desc.bInterfaceNumber, buf, count,
 935                         USB_CTRL_SET_TIMEOUT);
 936         /* count also the report id, if this was a numbered report. */
 937         if (ret > 0 && skipped_report_id)
 938                 ret++;
 939
 940         return ret;
 941 }
 942
 943 static int usbhid_output_report(struct hid_device *hid, __u8 *buf, size_t count)
 944 {
 945         struct usbhid_device *usbhid = hid->driver_data;
 946         struct usb_device *dev = hid_to_usb_dev(hid);
 947         int actual_length, skipped_report_id = 0, ret;
 948
 949         if (!usbhid->urbout)
 950                 return -ENOSYS;
 951
 952         if (buf[0] == 0x0) {
 953                 /* Don't send the Report ID */
 954                 buf++;
 955                 count--;
 956                 skipped_report_id = 1;
 957         }
 958
 959         ret = usb_interrupt_msg(dev, usbhid->urbout->pipe,
 960                                 buf, count, &actual_length,
 961                                 USB_CTRL_SET_TIMEOUT);
 962         /* return the number of bytes transferred */
 963         if (ret == 0) {
 964                 ret = actual_length;
 965                 /* count also the report id */
 966                 if (skipped_report_id)
 967                         ret++;
 968         }
 969
 970         return ret;
 971 }
 972
 973 static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
 974 {
 975         struct usbhid_device *usbhid = hid->driver_data;
 976
 977         usb_free_coherent(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
 978         usb_free_coherent(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
 979         kfree(usbhid->cr);
 980         usb_free_coherent(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
 981 }
 982
 983 static int usbhid_parse(struct hid_device *hid)
 984 {
 985         struct usb_interface *intf = to_usb_interface(hid->dev.parent);
 986         struct usb_host_interface *interface = intf->cur_altsetting;
 987         struct usb_device *dev = interface_to_usbdev (intf);
 988         struct hid_descriptor *hdesc;
 989         u32 quirks = 0;
 990         unsigned int rsize = 0;
 991         char *rdesc;
 992         int ret, n;
 993         int num_descriptors;
 994         size_t offset = offsetof(struct hid_descriptor, desc);
 995
 996         quirks = hid_lookup_quirk(hid);
 997
 998         if (quirks & HID_QUIRK_IGNORE)
 999                 return -ENODEV;
1000
1001         /* Many keyboards and mice don't like to be polled for reports,
1002          * so we will always set the HID_QUIRK_NOGET flag for them. */
1003         if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
1004                 if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD ||
1005                         interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE)
1006                                 quirks |= HID_QUIRK_NOGET;
1007         }
1008
1009         if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) &&
1010             (!interface->desc.bNumEndpoints ||
1011              usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) {
1012                 dbg_hid("class descriptor not present\n");
1013                 return -ENODEV;
1014         }
1015
1016         if (hdesc->bLength < sizeof(struct hid_descriptor)) {
1017                 dbg_hid("hid descriptor is too short\n");
1018                 return -EINVAL;
1019         }
1020
1021         hid->version = le16_to_cpu(hdesc->bcdHID);
1022         hid->country = hdesc->bCountryCode;
1023
1024         num_descriptors = min_t(int, hdesc->bNumDescriptors,
1025                (hdesc->bLength - offset) / sizeof(struct hid_class_descriptor));
1026
1027         for (n = 0; n < num_descriptors; n++)
1028                 if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT)
1029                         rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);
1030
1031         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
1032                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
1033                 return -EINVAL;
1034         }
1035
1036         rdesc = kmalloc(rsize, GFP_KERNEL);
1037         if (!rdesc)
1038                 return -ENOMEM;
1039
1040         hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0);
1041
1042         ret = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber,
1043                         HID_DT_REPORT, rdesc, rsize);
1044         if (ret < 0) {
1045                 dbg_hid("reading report descriptor failed\n");
1046                 kfree(rdesc);
1047                 goto err;
1048         }
1049
1050         ret = hid_parse_report(hid, rdesc, rsize);
1051         kfree(rdesc);
1052         if (ret) {
1053                 dbg_hid("parsing report descriptor failed\n");
1054                 goto err;
1055         }
1056
1057         hid->quirks |= quirks;
1058
1059         return 0;
1060 err:
1061         return ret;
1062 }
1063
1064 static int usbhid_start(struct hid_device *hid)
1065 {
1066         struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1067         struct usb_host_interface *interface = intf->cur_altsetting;
1068         struct usb_device *dev = interface_to_usbdev(intf);
1069         struct usbhid_device *usbhid = hid->driver_data;
1070         unsigned int n, insize = 0;
1071         int ret;
1072
1073         mutex_lock(&usbhid->mutex);
1074
1075         clear_bit(HID_DISCONNECTED, &usbhid->iofl);
1076
1077         usbhid->bufsize = HID_MIN_BUFFER_SIZE;
1078         hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
1079         hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
1080         hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize);
1081
1082         if (usbhid->bufsize > HID_MAX_BUFFER_SIZE)
1083                 usbhid->bufsize = HID_MAX_BUFFER_SIZE;
1084
1085         hid_find_max_report(hid, HID_INPUT_REPORT, &insize);
1086
1087         if (insize > HID_MAX_BUFFER_SIZE)
1088                 insize = HID_MAX_BUFFER_SIZE;
1089
1090         if (hid_alloc_buffers(dev, hid)) {
1091                 ret = -ENOMEM;
1092                 goto fail;
1093         }
1094
1095         for (n = 0; n < interface->desc.bNumEndpoints; n++) {
1096                 struct usb_endpoint_descriptor *endpoint;
1097                 int pipe;
1098                 int interval;
1099
1100                 endpoint = &interface->endpoint[n].desc;
1101                 if (!usb_endpoint_xfer_int(endpoint))
1102                         continue;
1103
1104                 interval = endpoint->bInterval;
1105
1106                 /* Some vendors give fullspeed interval on highspeed devides */
1107                 if (hid->quirks & HID_QUIRK_FULLSPEED_INTERVAL &&
1108                     dev->speed == USB_SPEED_HIGH) {
1109                         interval = fls(endpoint->bInterval*8);
1110                         pr_info("%s: Fixing fullspeed to highspeed interval: %d -> %d\n",
1111                                 hid->name, endpoint->bInterval, interval);
1112                 }
1113
1114                 /* Change the polling interval of mice, joysticks
1115                  * and keyboards.
1116                  */
1117                 switch (hid->collection->usage) {
1118                 case HID_GD_MOUSE:
1119                         if (hid_mousepoll_interval > 0)
1120                                 interval = hid_mousepoll_interval;
1121                         break;
1122                 case HID_GD_JOYSTICK:
1123                         if (hid_jspoll_interval > 0)
1124                                 interval = hid_jspoll_interval;
1125                         break;
1126                 case HID_GD_KEYBOARD:
1127                         if (hid_kbpoll_interval > 0)
1128                                 interval = hid_kbpoll_interval;
1129                         break;
1130                 }
1131
1132                 ret = -ENOMEM;
1133                 if (usb_endpoint_dir_in(endpoint)) {
1134                         if (usbhid->urbin)
1135                                 continue;
1136                         if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
1137                                 goto fail;
1138                         pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
1139                         usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize,
1140                                          hid_irq_in, hid, interval);
1141                         usbhid->urbin->transfer_dma = usbhid->inbuf_dma;
1142                         usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1143                 } else {
1144                         if (usbhid->urbout)
1145                                 continue;
1146                         if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
1147                                 goto fail;
1148                         pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress);
1149                         usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0,
1150                                          hid_irq_out, hid, interval);
1151                         usbhid->urbout->transfer_dma = usbhid->outbuf_dma;
1152                         usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1153                 }
1154         }
1155
1156         usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
1157         if (!usbhid->urbctrl) {
1158                 ret = -ENOMEM;
1159                 goto fail;
1160         }
1161
1162         usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr,
1163                              usbhid->ctrlbuf, 1, hid_ctrl, hid);
1164         usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
1165         usbhid->urbctrl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1166
1167         set_bit(HID_STARTED, &usbhid->iofl);
1168
1169         if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
1170                 ret = usb_autopm_get_interface(usbhid->intf);
1171                 if (ret)
1172                         goto fail;
1173                 set_bit(HID_IN_POLLING, &usbhid->iofl);
1174                 usbhid->intf->needs_remote_wakeup = 1;
1175                 ret = hid_start_in(hid);
1176                 if (ret) {
1177                         dev_err(&hid->dev,
1178                                 "failed to start in urb: %d\n", ret);
1179                 }
1180                 usb_autopm_put_interface(usbhid->intf);
1181         }
1182
1183         /* Some keyboards don't work until their LEDs have been set.
1184          * Since BIOSes do set the LEDs, it must be safe for any device
1185          * that supports the keyboard boot protocol.
1186          * In addition, enable remote wakeup by default for all keyboard
1187          * devices supporting the boot protocol.
1188          */
1189         if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT &&
1190                         interface->desc.bInterfaceProtocol ==
1191                                 USB_INTERFACE_PROTOCOL_KEYBOARD) {
1192                 usbhid_set_leds(hid);
1193                 device_set_wakeup_enable(&dev->dev, 1);
1194         }
1195
1196         mutex_unlock(&usbhid->mutex);
1197         return 0;
1198
1199 fail:
1200         usb_free_urb(usbhid->urbin);
1201         usb_free_urb(usbhid->urbout);
1202         usb_free_urb(usbhid->urbctrl);
1203         usbhid->urbin = NULL;
1204         usbhid->urbout = NULL;
1205         usbhid->urbctrl = NULL;
1206         hid_free_buffers(dev, hid);
1207         mutex_unlock(&usbhid->mutex);
1208         return ret;
1209 }
1210
1211 static void usbhid_stop(struct hid_device *hid)
1212 {
1213         struct usbhid_device *usbhid = hid->driver_data;
1214
1215         if (WARN_ON(!usbhid))
1216                 return;
1217
1218         if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
1219                 clear_bit(HID_IN_POLLING, &usbhid->iofl);
1220                 usbhid->intf->needs_remote_wakeup = 0;
1221         }
1222
1223         mutex_lock(&usbhid->mutex);
1224
1225         clear_bit(HID_STARTED, &usbhid->iofl);
1226
1227         spin_lock_irq(&usbhid->lock);   /* Sync with error and led handlers */
1228         set_bit(HID_DISCONNECTED, &usbhid->iofl);
1229         while (usbhid->ctrltail != usbhid->ctrlhead) {
1230                 if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_OUT) {
1231                         kfree(usbhid->ctrl[usbhid->ctrltail].raw_report);
1232                         usbhid->ctrl[usbhid->ctrltail].raw_report = NULL;
1233                 }
1234
1235                 usbhid->ctrltail = (usbhid->ctrltail + 1) &
1236                         (HID_CONTROL_FIFO_SIZE - 1);
1237         }
1238         spin_unlock_irq(&usbhid->lock);
1239
1240         usb_kill_urb(usbhid->urbin);
1241         usb_kill_urb(usbhid->urbout);
1242         usb_kill_urb(usbhid->urbctrl);
1243
1244         hid_cancel_delayed_stuff(usbhid);
1245
1246         hid->claimed = 0;
1247
1248         usb_free_urb(usbhid->urbin);
1249         usb_free_urb(usbhid->urbctrl);
1250         usb_free_urb(usbhid->urbout);
1251         usbhid->urbin = NULL; /* don't mess up next start */
1252         usbhid->urbctrl = NULL;
1253         usbhid->urbout = NULL;
1254
1255         hid_free_buffers(hid_to_usb_dev(hid), hid);
1256
1257         mutex_unlock(&usbhid->mutex);
1258 }
1259
1260 static int usbhid_power(struct hid_device *hid, int lvl)
1261 {
1262         struct usbhid_device *usbhid = hid->driver_data;
1263         int r = 0;
1264
1265         switch (lvl) {
1266         case PM_HINT_FULLON:
1267                 r = usb_autopm_get_interface(usbhid->intf);
1268                 break;
1269
1270         case PM_HINT_NORMAL:
1271                 usb_autopm_put_interface(usbhid->intf);
1272                 break;
1273         }
1274
1275         return r;
1276 }
1277
1278 static void usbhid_request(struct hid_device *hid, struct hid_report *rep, int reqtype)
1279 {
1280         switch (reqtype) {
1281         case HID_REQ_GET_REPORT:
1282                 usbhid_submit_report(hid, rep, USB_DIR_IN);
1283                 break;
1284         case HID_REQ_SET_REPORT:
1285                 usbhid_submit_report(hid, rep, USB_DIR_OUT);
1286                 break;
1287         }
1288 }
1289
1290 static int usbhid_raw_request(struct hid_device *hid, unsigned char reportnum,
1291                               __u8 *buf, size_t len, unsigned char rtype,
1292                               int reqtype)
1293 {
1294         switch (reqtype) {
1295         case HID_REQ_GET_REPORT:
1296                 return usbhid_get_raw_report(hid, reportnum, buf, len, rtype);
1297         case HID_REQ_SET_REPORT:
1298                 return usbhid_set_raw_report(hid, reportnum, buf, len, rtype);
1299         default:
1300                 return -EIO;
1301         }
1302 }
1303
1304 static int usbhid_idle(struct hid_device *hid, int report, int idle,
1305                 int reqtype)
1306 {
1307         struct usb_device *dev = hid_to_usb_dev(hid);
1308         struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1309         struct usb_host_interface *interface = intf->cur_altsetting;
1310         int ifnum = interface->desc.bInterfaceNumber;
1311
1312         if (reqtype != HID_REQ_SET_IDLE)
1313                 return -EINVAL;
1314
1315         return hid_set_idle(dev, ifnum, report, idle);
1316 }
1317
1318 static bool usbhid_may_wakeup(struct hid_device *hid)
1319 {
1320         struct usb_device *dev = hid_to_usb_dev(hid);
1321
1322         return device_may_wakeup(&dev->dev);
1323 }
1324
1325 struct hid_ll_driver usb_hid_driver = {
1326         .parse = usbhid_parse,
1327         .start = usbhid_start,
1328         .stop = usbhid_stop,
1329         .open = usbhid_open,
1330         .close = usbhid_close,
1331         .power = usbhid_power,
1332         .request = usbhid_request,
1333         .wait = usbhid_wait_io,
1334         .raw_request = usbhid_raw_request,
1335         .output_report = usbhid_output_report,
1336         .idle = usbhid_idle,
1337         .may_wakeup = usbhid_may_wakeup,
1338 };
1339 EXPORT_SYMBOL_GPL(usb_hid_driver);
1340
1341 static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
1342 {
1343         struct usb_host_interface *interface = intf->cur_altsetting;
1344         struct usb_device *dev = interface_to_usbdev(intf);
1345         struct usbhid_device *usbhid;
1346         struct hid_device *hid;
1347         unsigned int n, has_in = 0;
1348         size_t len;
1349         int ret;
1350
1351         dbg_hid("HID probe called for ifnum %d\n",
1352                         intf->altsetting->desc.bInterfaceNumber);
1353
1354         for (n = 0; n < interface->desc.bNumEndpoints; n++)
1355                 if (usb_endpoint_is_int_in(&interface->endpoint[n].desc))
1356                         has_in++;
1357         if (!has_in) {
1358                 hid_err(intf, "couldn't find an input interrupt endpoint\n");
1359                 return -ENODEV;
1360         }
1361
1362         hid = hid_allocate_device();
1363         if (IS_ERR(hid))
1364                 return PTR_ERR(hid);
1365
1366         usb_set_intfdata(intf, hid);
1367         hid->ll_driver = &usb_hid_driver;
1368         hid->ff_init = hid_pidff_init;
1369 #ifdef CONFIG_USB_HIDDEV
1370         hid->hiddev_connect = hiddev_connect;
1371         hid->hiddev_disconnect = hiddev_disconnect;
1372         hid->hiddev_hid_event = hiddev_hid_event;
1373         hid->hiddev_report_event = hiddev_report_event;
1374 #endif
1375         hid->dev.parent = &intf->dev;
1376         hid->bus = BUS_USB;
1377         hid->vendor = le16_to_cpu(dev->descriptor.idVendor);
1378         hid->product = le16_to_cpu(dev->descriptor.idProduct);
1379         hid->version = le16_to_cpu(dev->descriptor.bcdDevice);
1380         hid->name[0] = 0;
1381         if (intf->cur_altsetting->desc.bInterfaceProtocol ==
1382                         USB_INTERFACE_PROTOCOL_MOUSE)
1383                 hid->type = HID_TYPE_USBMOUSE;
1384         else if (intf->cur_altsetting->desc.bInterfaceProtocol == 0)
1385                 hid->type = HID_TYPE_USBNONE;
1386
1387         if (dev->manufacturer)
1388                 strlcpy(hid->name, dev->manufacturer, sizeof(hid->name));
1389
1390         if (dev->product) {
1391                 if (dev->manufacturer)
1392                         strlcat(hid->name, " ", sizeof(hid->name));
1393                 strlcat(hid->name, dev->product, sizeof(hid->name));
1394         }
1395
1396         if (!strlen(hid->name))
1397                 snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x",
1398                          le16_to_cpu(dev->descriptor.idVendor),
1399                          le16_to_cpu(dev->descriptor.idProduct));
1400
1401         usb_make_path(dev, hid->phys, sizeof(hid->phys));
1402         strlcat(hid->phys, "/input", sizeof(hid->phys));
1403         len = strlen(hid->phys);
1404         if (len < sizeof(hid->phys) - 1)
1405                 snprintf(hid->phys + len, sizeof(hid->phys) - len,
1406                          "%d", intf->altsetting[0].desc.bInterfaceNumber);
1407
1408         if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
1409                 hid->uniq[0] = 0;
1410
1411         usbhid = kzalloc(sizeof(*usbhid), GFP_KERNEL);
1412         if (usbhid == NULL) {
1413                 ret = -ENOMEM;
1414                 goto err;
1415         }
1416
1417         hid->driver_data = usbhid;
1418         usbhid->hid = hid;
1419         usbhid->intf = intf;
1420         usbhid->ifnum = interface->desc.bInterfaceNumber;
1421
1422         init_waitqueue_head(&usbhid->wait);
1423         INIT_WORK(&usbhid->reset_work, hid_reset);
1424         timer_setup(&usbhid->io_retry, hid_retry_timeout, 0);
1425         spin_lock_init(&usbhid->lock);
1426         mutex_init(&usbhid->mutex);
1427
1428         ret = hid_add_device(hid);
1429         if (ret) {
1430                 if (ret != -ENODEV)
1431                         hid_err(intf, "can't add hid device: %d\n", ret);
1432                 goto err_free;
1433         }
1434
1435         return 0;
1436 err_free:
1437         kfree(usbhid);
1438 err:
1439         hid_destroy_device(hid);
1440         return ret;
1441 }
1442
1443 static void usbhid_disconnect(struct usb_interface *intf)
1444 {
1445         struct hid_device *hid = usb_get_intfdata(intf);
1446         struct usbhid_device *usbhid;
1447
1448         if (WARN_ON(!hid))
1449                 return;
1450
1451         usbhid = hid->driver_data;
1452         spin_lock_irq(&usbhid->lock);   /* Sync with error and led handlers */
1453         set_bit(HID_DISCONNECTED, &usbhid->iofl);
1454         spin_unlock_irq(&usbhid->lock);
1455         hid_destroy_device(hid);
1456         kfree(usbhid);
1457 }
1458
1459 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
1460 {
1461         del_timer_sync(&usbhid->io_retry);
1462         cancel_work_sync(&usbhid->reset_work);
1463 }
1464
1465 static void hid_cease_io(struct usbhid_device *usbhid)
1466 {
1467         del_timer_sync(&usbhid->io_retry);
1468         usb_kill_urb(usbhid->urbin);
1469         usb_kill_urb(usbhid->urbctrl);
1470         usb_kill_urb(usbhid->urbout);
1471 }
1472
1473 static void hid_restart_io(struct hid_device *hid)
1474 {
1475         struct usbhid_device *usbhid = hid->driver_data;
1476         int clear_halt = test_bit(HID_CLEAR_HALT, &usbhid->iofl);
1477         int reset_pending = test_bit(HID_RESET_PENDING, &usbhid->iofl);
1478
1479         spin_lock_irq(&usbhid->lock);
1480         clear_bit(HID_SUSPENDED, &usbhid->iofl);
1481         usbhid_mark_busy(usbhid);
1482
1483         if (clear_halt || reset_pending)
1484                 schedule_work(&usbhid->reset_work);
1485         usbhid->retry_delay = 0;
1486         spin_unlock_irq(&usbhid->lock);
1487
1488         if (reset_pending || !test_bit(HID_STARTED, &usbhid->iofl))
1489                 return;
1490
1491         if (!clear_halt) {
1492                 if (hid_start_in(hid) < 0)
1493                         hid_io_error(hid);
1494         }
1495
1496         spin_lock_irq(&usbhid->lock);
1497         if (usbhid->urbout && !test_bit(HID_OUT_RUNNING, &usbhid->iofl))
1498                 usbhid_restart_out_queue(usbhid);
1499         if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
1500                 usbhid_restart_ctrl_queue(usbhid);
1501         spin_unlock_irq(&usbhid->lock);
1502 }
1503
1504 /* Treat USB reset pretty much the same as suspend/resume */
1505 static int hid_pre_reset(struct usb_interface *intf)
1506 {
1507         struct hid_device *hid = usb_get_intfdata(intf);
1508         struct usbhid_device *usbhid = hid->driver_data;
1509
1510         spin_lock_irq(&usbhid->lock);
1511         set_bit(HID_RESET_PENDING, &usbhid->iofl);
1512         spin_unlock_irq(&usbhid->lock);
1513         hid_cease_io(usbhid);
1514
1515         return 0;
1516 }
1517
1518 /* Same routine used for post_reset and reset_resume */
1519 static int hid_post_reset(struct usb_interface *intf)
1520 {
1521         struct usb_device *dev = interface_to_usbdev (intf);
1522         struct hid_device *hid = usb_get_intfdata(intf);
1523         struct usbhid_device *usbhid = hid->driver_data;
1524         struct usb_host_interface *interface = intf->cur_altsetting;
1525         int status;
1526         char *rdesc;
1527
1528         /* Fetch and examine the HID report descriptor. If this
1529          * has changed, then rebind. Since usbcore's check of the
1530          * configuration descriptors passed, we already know that
1531          * the size of the HID report descriptor has not changed.
1532          */
1533         rdesc = kmalloc(hid->dev_rsize, GFP_KERNEL);
1534         if (!rdesc)
1535                 return -ENOMEM;
1536
1537         status = hid_get_class_descriptor(dev,
1538                                 interface->desc.bInterfaceNumber,
1539                                 HID_DT_REPORT, rdesc, hid->dev_rsize);
1540         if (status < 0) {
1541                 dbg_hid("reading report descriptor failed (post_reset)\n");
1542                 kfree(rdesc);
1543                 return status;
1544         }
1545         status = memcmp(rdesc, hid->dev_rdesc, hid->dev_rsize);
1546         kfree(rdesc);
1547         if (status != 0) {
1548                 dbg_hid("report descriptor changed\n");
1549                 return -EPERM;
1550         }
1551
1552         /* No need to do another reset or clear a halted endpoint */
1553         spin_lock_irq(&usbhid->lock);
1554         clear_bit(HID_RESET_PENDING, &usbhid->iofl);
1555         clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
1556         spin_unlock_irq(&usbhid->lock);
1557         hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
1558
1559         hid_restart_io(hid);
1560
1561         return 0;
1562 }
1563
1564 #ifdef CONFIG_PM
1565 static int hid_resume_common(struct hid_device *hid, bool driver_suspended)
1566 {
1567         int status = 0;
1568
1569         hid_restart_io(hid);
1570         if (driver_suspended && hid->driver && hid->driver->resume)
1571                 status = hid->driver->resume(hid);
1572         return status;
1573 }
1574
1575 static int hid_suspend(struct usb_interface *intf, pm_message_t message)
1576 {
1577         struct hid_device *hid = usb_get_intfdata(intf);
1578         struct usbhid_device *usbhid = hid->driver_data;
1579         int status = 0;
1580         bool driver_suspended = false;
1581         unsigned int ledcount;
1582
1583         if (PMSG_IS_AUTO(message)) {
1584                 ledcount = hidinput_count_leds(hid);
1585                 spin_lock_irq(&usbhid->lock);   /* Sync with error handler */
1586                 if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
1587                     && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
1588                     && !test_bit(HID_OUT_RUNNING, &usbhid->iofl)
1589                     && !test_bit(HID_CTRL_RUNNING, &usbhid->iofl)
1590                     && !test_bit(HID_KEYS_PRESSED, &usbhid->iofl)
1591                     && (!ledcount || ignoreled))
1592                 {
1593                         set_bit(HID_SUSPENDED, &usbhid->iofl);
1594                         spin_unlock_irq(&usbhid->lock);
1595                         if (hid->driver && hid->driver->suspend) {
1596                                 status = hid->driver->suspend(hid, message);
1597                                 if (status < 0)
1598                                         goto failed;
1599                         }
1600                         driver_suspended = true;
1601                 } else {
1602                         usbhid_mark_busy(usbhid);
1603                         spin_unlock_irq(&usbhid->lock);
1604                         return -EBUSY;
1605                 }
1606
1607         } else {
1608                 /* TODO: resume() might need to handle suspend failure */
1609                 if (hid->driver && hid->driver->suspend)
1610                         status = hid->driver->suspend(hid, message);
1611                 driver_suspended = true;
1612                 spin_lock_irq(&usbhid->lock);
1613                 set_bit(HID_SUSPENDED, &usbhid->iofl);
1614                 spin_unlock_irq(&usbhid->lock);
1615                 if (usbhid_wait_io(hid) < 0)
1616                         status = -EIO;
1617         }
1618
1619         hid_cancel_delayed_stuff(usbhid);
1620         hid_cease_io(usbhid);
1621
1622         if (PMSG_IS_AUTO(message) && test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
1623                 /* lost race against keypresses */
1624                 status = -EBUSY;
1625                 goto failed;
1626         }
1627         dev_dbg(&intf->dev, "suspend\n");
1628         return status;
1629
1630  failed:
1631         hid_resume_common(hid, driver_suspended);
1632         return status;
1633 }
1634
1635 static int hid_resume(struct usb_interface *intf)
1636 {
1637         struct hid_device *hid = usb_get_intfdata (intf);
1638         int status;
1639
1640         status = hid_resume_common(hid, true);
1641         dev_dbg(&intf->dev, "resume status %d\n", status);
1642         return 0;
1643 }
1644
1645 static int hid_reset_resume(struct usb_interface *intf)
1646 {
1647         struct hid_device *hid = usb_get_intfdata(intf);
1648         int status;
1649
1650         status = hid_post_reset(intf);
1651         if (status >= 0 && hid->driver && hid->driver->reset_resume) {
1652                 int ret = hid->driver->reset_resume(hid);
1653                 if (ret < 0)
1654                         status = ret;
1655         }
1656         return status;
1657 }
1658
1659 #endif /* CONFIG_PM */
1660
1661 static const struct usb_device_id hid_usb_ids[] = {
1662         { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
1663                 .bInterfaceClass = USB_INTERFACE_CLASS_HID },
1664         { }                                             /* Terminating entry */
1665 };
1666
1667 MODULE_DEVICE_TABLE (usb, hid_usb_ids);
1668
1669 static struct usb_driver hid_driver = {
1670         .name =         "usbhid",
1671         .probe =        usbhid_probe,
1672         .disconnect =   usbhid_disconnect,
1673 #ifdef CONFIG_PM
1674         .suspend =      hid_suspend,
1675         .resume =       hid_resume,
1676         .reset_resume = hid_reset_resume,
1677 #endif
1678         .pre_reset =    hid_pre_reset,
1679         .post_reset =   hid_post_reset,
1680         .id_table =     hid_usb_ids,
1681         .supports_autosuspend = 1,
1682 };
1683
1684 struct usb_interface *usbhid_find_interface(int minor)
1685 {
1686         return usb_find_interface(&hid_driver, minor);
1687 }
1688
1689 static int __init hid_init(void)
1690 {
1691         int retval;
1692
1693         retval = hid_quirks_init(quirks_param, BUS_USB, MAX_USBHID_BOOT_QUIRKS);
1694         if (retval)
1695                 goto usbhid_quirks_init_fail;
1696         retval = usb_register(&hid_driver);
1697         if (retval)
1698                 goto usb_register_fail;
1699         pr_info(KBUILD_MODNAME ": " DRIVER_DESC "\n");
1700
1701         return 0;
1702 usb_register_fail:
1703         hid_quirks_exit(BUS_USB);
1704 usbhid_quirks_init_fail:
1705         return retval;
1706 }
1707
1708 static void __exit hid_exit(void)
1709 {
1710         usb_deregister(&hid_driver);
1711         hid_quirks_exit(BUS_USB);
1712 }
1713
1714 module_init(hid_init);
1715 module_exit(hid_exit);
1716
1717 MODULE_AUTHOR("Andreas Gal");
1718 MODULE_AUTHOR("Vojtech Pavlik");
1719 MODULE_AUTHOR("Jiri Kosina");
1720 MODULE_DESCRIPTION(DRIVER_DESC);
1721 MODULE_LICENSE("GPL");