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