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