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