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) 2006-2007 Jiri Kosina 8 */ 9 10 /* 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License as published by the Free 13 * Software Foundation; either version 2 of the License, or (at your option) 14 * any later version. 15 */ 16 17 #include <linux/module.h> 18 #include <linux/slab.h> 19 #include <linux/init.h> 20 #include <linux/kernel.h> 21 #include <linux/list.h> 22 #include <linux/mm.h> 23 #include <linux/smp_lock.h> 24 #include <linux/spinlock.h> 25 #include <asm/unaligned.h> 26 #include <asm/byteorder.h> 27 #include <linux/input.h> 28 #include <linux/wait.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_VERSION "v2.6" 43 #define DRIVER_AUTHOR "Andreas Gal, Vojtech Pavlik, Jiri Kosina" 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 /* Quirks specified at module load time */ 56 static char *quirks_param[MAX_USBHID_BOOT_QUIRKS] = { [ 0 ... (MAX_USBHID_BOOT_QUIRKS - 1) ] = NULL }; 57 module_param_array_named(quirks, quirks_param, charp, NULL, 0444); 58 MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying " 59 " quirks=vendorID:productID:quirks" 60 " where vendorID, productID, and quirks are all in" 61 " 0x-prefixed hex"); 62 /* 63 * Input submission and I/O error handler. 64 */ 65 66 static void hid_io_error(struct hid_device *hid); 67 68 /* Start up the input URB */ 69 static int hid_start_in(struct hid_device *hid) 70 { 71 unsigned long flags; 72 int rc = 0; 73 struct usbhid_device *usbhid = hid->driver_data; 74 75 spin_lock_irqsave(&usbhid->inlock, flags); 76 if (hid->open > 0 && !test_bit(HID_SUSPENDED, &usbhid->iofl) && 77 !test_bit(HID_DISCONNECTED, &usbhid->iofl) && 78 !test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) { 79 rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC); 80 if (rc != 0) 81 clear_bit(HID_IN_RUNNING, &usbhid->iofl); 82 } 83 spin_unlock_irqrestore(&usbhid->inlock, flags); 84 return rc; 85 } 86 87 /* I/O retry timer routine */ 88 static void hid_retry_timeout(unsigned long _hid) 89 { 90 struct hid_device *hid = (struct hid_device *) _hid; 91 struct usbhid_device *usbhid = hid->driver_data; 92 93 dev_dbg(&usbhid->intf->dev, "retrying intr urb\n"); 94 if (hid_start_in(hid)) 95 hid_io_error(hid); 96 } 97 98 /* Workqueue routine to reset the device or clear a halt */ 99 static void hid_reset(struct work_struct *work) 100 { 101 struct usbhid_device *usbhid = 102 container_of(work, struct usbhid_device, reset_work); 103 struct hid_device *hid = usbhid->hid; 104 int rc_lock, rc = 0; 105 106 if (test_bit(HID_CLEAR_HALT, &usbhid->iofl)) { 107 dev_dbg(&usbhid->intf->dev, "clear halt\n"); 108 rc = usb_clear_halt(hid_to_usb_dev(hid), usbhid->urbin->pipe); 109 clear_bit(HID_CLEAR_HALT, &usbhid->iofl); 110 hid_start_in(hid); 111 } 112 113 else if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) { 114 dev_dbg(&usbhid->intf->dev, "resetting device\n"); 115 rc = rc_lock = usb_lock_device_for_reset(hid_to_usb_dev(hid), usbhid->intf); 116 if (rc_lock >= 0) { 117 rc = usb_reset_device(hid_to_usb_dev(hid)); 118 if (rc_lock) 119 usb_unlock_device(hid_to_usb_dev(hid)); 120 } 121 clear_bit(HID_RESET_PENDING, &usbhid->iofl); 122 } 123 124 switch (rc) { 125 case 0: 126 if (!test_bit(HID_IN_RUNNING, &usbhid->iofl)) 127 hid_io_error(hid); 128 break; 129 default: 130 err_hid("can't reset device, %s-%s/input%d, status %d", 131 hid_to_usb_dev(hid)->bus->bus_name, 132 hid_to_usb_dev(hid)->devpath, 133 usbhid->ifnum, rc); 134 /* FALLTHROUGH */ 135 case -EHOSTUNREACH: 136 case -ENODEV: 137 case -EINTR: 138 break; 139 } 140 } 141 142 /* Main I/O error handler */ 143 static void hid_io_error(struct hid_device *hid) 144 { 145 unsigned long flags; 146 struct usbhid_device *usbhid = hid->driver_data; 147 148 spin_lock_irqsave(&usbhid->inlock, 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 */ 169 if (!test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) { 170 schedule_work(&usbhid->reset_work); 171 goto done; 172 } 173 } 174 175 mod_timer(&usbhid->io_retry, 176 jiffies + msecs_to_jiffies(usbhid->retry_delay)); 177 done: 178 spin_unlock_irqrestore(&usbhid->inlock, flags); 179 } 180 181 /* 182 * Input interrupt completion handler. 183 */ 184 185 static void hid_irq_in(struct urb *urb) 186 { 187 struct hid_device *hid = urb->context; 188 struct usbhid_device *usbhid = hid->driver_data; 189 int status; 190 191 switch (urb->status) { 192 case 0: /* success */ 193 usbhid->retry_delay = 0; 194 hid_input_report(urb->context, HID_INPUT_REPORT, 195 urb->transfer_buffer, 196 urb->actual_length, 1); 197 break; 198 case -EPIPE: /* stall */ 199 clear_bit(HID_IN_RUNNING, &usbhid->iofl); 200 set_bit(HID_CLEAR_HALT, &usbhid->iofl); 201 schedule_work(&usbhid->reset_work); 202 return; 203 case -ECONNRESET: /* unlink */ 204 case -ENOENT: 205 case -ESHUTDOWN: /* unplug */ 206 clear_bit(HID_IN_RUNNING, &usbhid->iofl); 207 return; 208 case -EILSEQ: /* protocol error or unplug */ 209 case -EPROTO: /* protocol error or unplug */ 210 case -ETIME: /* protocol error or unplug */ 211 case -ETIMEDOUT: /* Should never happen, but... */ 212 clear_bit(HID_IN_RUNNING, &usbhid->iofl); 213 hid_io_error(hid); 214 return; 215 default: /* error */ 216 dev_warn(&urb->dev->dev, "input irq status %d " 217 "received\n", urb->status); 218 } 219 220 status = usb_submit_urb(urb, GFP_ATOMIC); 221 if (status) { 222 clear_bit(HID_IN_RUNNING, &usbhid->iofl); 223 if (status != -EPERM) { 224 err_hid("can't resubmit intr, %s-%s/input%d, status %d", 225 hid_to_usb_dev(hid)->bus->bus_name, 226 hid_to_usb_dev(hid)->devpath, 227 usbhid->ifnum, status); 228 hid_io_error(hid); 229 } 230 } 231 } 232 233 static int hid_submit_out(struct hid_device *hid) 234 { 235 struct hid_report *report; 236 char *raw_report; 237 struct usbhid_device *usbhid = hid->driver_data; 238 239 report = usbhid->out[usbhid->outtail].report; 240 raw_report = usbhid->out[usbhid->outtail].raw_report; 241 242 usbhid->urbout->transfer_buffer_length = ((report->size - 1) >> 3) + 1 + (report->id > 0); 243 usbhid->urbout->dev = hid_to_usb_dev(hid); 244 memcpy(usbhid->outbuf, raw_report, usbhid->urbout->transfer_buffer_length); 245 kfree(raw_report); 246 247 dbg_hid("submitting out urb\n"); 248 249 if (usb_submit_urb(usbhid->urbout, GFP_ATOMIC)) { 250 err_hid("usb_submit_urb(out) failed"); 251 return -1; 252 } 253 254 return 0; 255 } 256 257 static int hid_submit_ctrl(struct hid_device *hid) 258 { 259 struct hid_report *report; 260 unsigned char dir; 261 char *raw_report; 262 int len; 263 struct usbhid_device *usbhid = hid->driver_data; 264 265 report = usbhid->ctrl[usbhid->ctrltail].report; 266 raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report; 267 dir = usbhid->ctrl[usbhid->ctrltail].dir; 268 269 len = ((report->size - 1) >> 3) + 1 + (report->id > 0); 270 if (dir == USB_DIR_OUT) { 271 usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0); 272 usbhid->urbctrl->transfer_buffer_length = len; 273 memcpy(usbhid->ctrlbuf, raw_report, len); 274 kfree(raw_report); 275 } else { 276 int maxpacket, padlen; 277 278 usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0); 279 maxpacket = usb_maxpacket(hid_to_usb_dev(hid), usbhid->urbctrl->pipe, 0); 280 if (maxpacket > 0) { 281 padlen = DIV_ROUND_UP(len, maxpacket); 282 padlen *= maxpacket; 283 if (padlen > usbhid->bufsize) 284 padlen = usbhid->bufsize; 285 } else 286 padlen = 0; 287 usbhid->urbctrl->transfer_buffer_length = padlen; 288 } 289 usbhid->urbctrl->dev = hid_to_usb_dev(hid); 290 291 usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir; 292 usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT : HID_REQ_GET_REPORT; 293 usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) | report->id); 294 usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum); 295 usbhid->cr->wLength = cpu_to_le16(len); 296 297 dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n", 298 usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" : "Get_Report", 299 usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength); 300 301 if (usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC)) { 302 err_hid("usb_submit_urb(ctrl) failed"); 303 return -1; 304 } 305 306 return 0; 307 } 308 309 /* 310 * Output interrupt completion handler. 311 */ 312 313 static void hid_irq_out(struct urb *urb) 314 { 315 struct hid_device *hid = urb->context; 316 struct usbhid_device *usbhid = hid->driver_data; 317 unsigned long flags; 318 int unplug = 0; 319 320 switch (urb->status) { 321 case 0: /* success */ 322 break; 323 case -ESHUTDOWN: /* unplug */ 324 unplug = 1; 325 case -EILSEQ: /* protocol error or unplug */ 326 case -EPROTO: /* protocol error or unplug */ 327 case -ECONNRESET: /* unlink */ 328 case -ENOENT: 329 break; 330 default: /* error */ 331 dev_warn(&urb->dev->dev, "output irq status %d " 332 "received\n", urb->status); 333 } 334 335 spin_lock_irqsave(&usbhid->outlock, flags); 336 337 if (unplug) 338 usbhid->outtail = usbhid->outhead; 339 else 340 usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1); 341 342 if (usbhid->outhead != usbhid->outtail) { 343 if (hid_submit_out(hid)) { 344 clear_bit(HID_OUT_RUNNING, &usbhid->iofl); 345 wake_up(&usbhid->wait); 346 } 347 spin_unlock_irqrestore(&usbhid->outlock, flags); 348 return; 349 } 350 351 clear_bit(HID_OUT_RUNNING, &usbhid->iofl); 352 spin_unlock_irqrestore(&usbhid->outlock, flags); 353 wake_up(&usbhid->wait); 354 } 355 356 /* 357 * Control pipe completion handler. 358 */ 359 360 static void hid_ctrl(struct urb *urb) 361 { 362 struct hid_device *hid = urb->context; 363 struct usbhid_device *usbhid = hid->driver_data; 364 unsigned long flags; 365 int unplug = 0; 366 367 spin_lock_irqsave(&usbhid->ctrllock, flags); 368 369 switch (urb->status) { 370 case 0: /* success */ 371 if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN) 372 hid_input_report(urb->context, 373 usbhid->ctrl[usbhid->ctrltail].report->type, 374 urb->transfer_buffer, urb->actual_length, 0); 375 break; 376 case -ESHUTDOWN: /* unplug */ 377 unplug = 1; 378 case -EILSEQ: /* protocol error or unplug */ 379 case -EPROTO: /* protocol error or unplug */ 380 case -ECONNRESET: /* unlink */ 381 case -ENOENT: 382 case -EPIPE: /* report not available */ 383 break; 384 default: /* error */ 385 dev_warn(&urb->dev->dev, "ctrl urb status %d " 386 "received\n", urb->status); 387 } 388 389 if (unplug) 390 usbhid->ctrltail = usbhid->ctrlhead; 391 else 392 usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1); 393 394 if (usbhid->ctrlhead != usbhid->ctrltail) { 395 if (hid_submit_ctrl(hid)) { 396 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl); 397 wake_up(&usbhid->wait); 398 } 399 spin_unlock_irqrestore(&usbhid->ctrllock, flags); 400 return; 401 } 402 403 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl); 404 spin_unlock_irqrestore(&usbhid->ctrllock, flags); 405 wake_up(&usbhid->wait); 406 } 407 408 void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir) 409 { 410 int head; 411 unsigned long flags; 412 struct usbhid_device *usbhid = hid->driver_data; 413 int len = ((report->size - 1) >> 3) + 1 + (report->id > 0); 414 415 if ((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN) 416 return; 417 418 if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) { 419 420 spin_lock_irqsave(&usbhid->outlock, flags); 421 422 if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) { 423 spin_unlock_irqrestore(&usbhid->outlock, flags); 424 dev_warn(&hid->dev, "output queue full\n"); 425 return; 426 } 427 428 usbhid->out[usbhid->outhead].raw_report = kmalloc(len, GFP_ATOMIC); 429 if (!usbhid->out[usbhid->outhead].raw_report) { 430 spin_unlock_irqrestore(&usbhid->outlock, flags); 431 warn("output queueing failed"); 432 return; 433 } 434 hid_output_report(report, usbhid->out[usbhid->outhead].raw_report); 435 usbhid->out[usbhid->outhead].report = report; 436 usbhid->outhead = head; 437 438 if (!test_and_set_bit(HID_OUT_RUNNING, &usbhid->iofl)) 439 if (hid_submit_out(hid)) 440 clear_bit(HID_OUT_RUNNING, &usbhid->iofl); 441 442 spin_unlock_irqrestore(&usbhid->outlock, flags); 443 return; 444 } 445 446 spin_lock_irqsave(&usbhid->ctrllock, flags); 447 448 if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) { 449 spin_unlock_irqrestore(&usbhid->ctrllock, flags); 450 dev_warn(&hid->dev, "control queue full\n"); 451 return; 452 } 453 454 if (dir == USB_DIR_OUT) { 455 usbhid->ctrl[usbhid->ctrlhead].raw_report = kmalloc(len, GFP_ATOMIC); 456 if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) { 457 spin_unlock_irqrestore(&usbhid->ctrllock, flags); 458 warn("control queueing failed"); 459 return; 460 } 461 hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report); 462 } 463 usbhid->ctrl[usbhid->ctrlhead].report = report; 464 usbhid->ctrl[usbhid->ctrlhead].dir = dir; 465 usbhid->ctrlhead = head; 466 467 if (!test_and_set_bit(HID_CTRL_RUNNING, &usbhid->iofl)) 468 if (hid_submit_ctrl(hid)) 469 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl); 470 471 spin_unlock_irqrestore(&usbhid->ctrllock, flags); 472 } 473 EXPORT_SYMBOL_GPL(usbhid_submit_report); 474 475 static int usb_hidinput_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 476 { 477 struct hid_device *hid = input_get_drvdata(dev); 478 struct hid_field *field; 479 int offset; 480 481 if (type == EV_FF) 482 return input_ff_event(dev, type, code, value); 483 484 if (type != EV_LED) 485 return -1; 486 487 if ((offset = hidinput_find_field(hid, type, code, &field)) == -1) { 488 dev_warn(&dev->dev, "event field not found\n"); 489 return -1; 490 } 491 492 hid_set_field(field, offset, value); 493 usbhid_submit_report(hid, field->report, USB_DIR_OUT); 494 495 return 0; 496 } 497 498 int usbhid_wait_io(struct hid_device *hid) 499 { 500 struct usbhid_device *usbhid = hid->driver_data; 501 502 if (!wait_event_timeout(usbhid->wait, 503 (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) && 504 !test_bit(HID_OUT_RUNNING, &usbhid->iofl)), 505 10*HZ)) { 506 dbg_hid("timeout waiting for ctrl or out queue to clear\n"); 507 return -1; 508 } 509 510 return 0; 511 } 512 513 static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle) 514 { 515 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 516 HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report, 517 ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT); 518 } 519 520 static int hid_get_class_descriptor(struct usb_device *dev, int ifnum, 521 unsigned char type, void *buf, int size) 522 { 523 int result, retries = 4; 524 525 memset(buf, 0, size); 526 527 do { 528 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 529 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN, 530 (type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT); 531 retries--; 532 } while (result < size && retries); 533 return result; 534 } 535 536 int usbhid_open(struct hid_device *hid) 537 { 538 struct usbhid_device *usbhid = hid->driver_data; 539 int res; 540 541 if (!hid->open++) { 542 res = usb_autopm_get_interface(usbhid->intf); 543 if (res < 0) { 544 hid->open--; 545 return -EIO; 546 } 547 } 548 if (hid_start_in(hid)) 549 hid_io_error(hid); 550 return 0; 551 } 552 553 void usbhid_close(struct hid_device *hid) 554 { 555 struct usbhid_device *usbhid = hid->driver_data; 556 557 if (!--hid->open) { 558 usb_kill_urb(usbhid->urbin); 559 usb_autopm_put_interface(usbhid->intf); 560 } 561 } 562 563 /* 564 * Initialize all reports 565 */ 566 567 void usbhid_init_reports(struct hid_device *hid) 568 { 569 struct hid_report *report; 570 struct usbhid_device *usbhid = hid->driver_data; 571 int err, ret; 572 573 list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].report_list, list) 574 usbhid_submit_report(hid, report, USB_DIR_IN); 575 576 list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].report_list, list) 577 usbhid_submit_report(hid, report, USB_DIR_IN); 578 579 err = 0; 580 ret = usbhid_wait_io(hid); 581 while (ret) { 582 err |= ret; 583 if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) 584 usb_kill_urb(usbhid->urbctrl); 585 if (test_bit(HID_OUT_RUNNING, &usbhid->iofl)) 586 usb_kill_urb(usbhid->urbout); 587 ret = usbhid_wait_io(hid); 588 } 589 590 if (err) 591 dev_warn(&hid->dev, "timeout initializing reports\n"); 592 } 593 594 /* 595 * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01). 596 */ 597 static int hid_find_field_early(struct hid_device *hid, unsigned int page, 598 unsigned int hid_code, struct hid_field **pfield) 599 { 600 struct hid_report *report; 601 struct hid_field *field; 602 struct hid_usage *usage; 603 int i, j; 604 605 list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) { 606 for (i = 0; i < report->maxfield; i++) { 607 field = report->field[i]; 608 for (j = 0; j < field->maxusage; j++) { 609 usage = &field->usage[j]; 610 if ((usage->hid & HID_USAGE_PAGE) == page && 611 (usage->hid & 0xFFFF) == hid_code) { 612 *pfield = field; 613 return j; 614 } 615 } 616 } 617 } 618 return -1; 619 } 620 621 void usbhid_set_leds(struct hid_device *hid) 622 { 623 struct hid_field *field; 624 int offset; 625 626 if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) { 627 hid_set_field(field, offset, 0); 628 usbhid_submit_report(hid, field->report, USB_DIR_OUT); 629 } 630 } 631 EXPORT_SYMBOL_GPL(usbhid_set_leds); 632 633 /* 634 * Traverse the supplied list of reports and find the longest 635 */ 636 static void hid_find_max_report(struct hid_device *hid, unsigned int type, 637 unsigned int *max) 638 { 639 struct hid_report *report; 640 unsigned int size; 641 642 list_for_each_entry(report, &hid->report_enum[type].report_list, list) { 643 size = ((report->size - 1) >> 3) + 1; 644 if (type == HID_INPUT_REPORT && hid->report_enum[type].numbered) 645 size++; 646 if (*max < size) 647 *max = size; 648 } 649 } 650 651 static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid) 652 { 653 struct usbhid_device *usbhid = hid->driver_data; 654 655 if (!(usbhid->inbuf = usb_buffer_alloc(dev, usbhid->bufsize, GFP_ATOMIC, &usbhid->inbuf_dma))) 656 return -1; 657 if (!(usbhid->outbuf = usb_buffer_alloc(dev, usbhid->bufsize, GFP_ATOMIC, &usbhid->outbuf_dma))) 658 return -1; 659 if (!(usbhid->cr = usb_buffer_alloc(dev, sizeof(*(usbhid->cr)), GFP_ATOMIC, &usbhid->cr_dma))) 660 return -1; 661 if (!(usbhid->ctrlbuf = usb_buffer_alloc(dev, usbhid->bufsize, GFP_ATOMIC, &usbhid->ctrlbuf_dma))) 662 return -1; 663 664 return 0; 665 } 666 667 static int usbhid_output_raw_report(struct hid_device *hid, __u8 *buf, size_t count) 668 { 669 struct usbhid_device *usbhid = hid->driver_data; 670 struct usb_device *dev = hid_to_usb_dev(hid); 671 struct usb_interface *intf = usbhid->intf; 672 struct usb_host_interface *interface = intf->cur_altsetting; 673 int ret; 674 675 ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 676 HID_REQ_SET_REPORT, 677 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 678 ((HID_OUTPUT_REPORT + 1) << 8) | *buf, 679 interface->desc.bInterfaceNumber, buf + 1, count - 1, 680 USB_CTRL_SET_TIMEOUT); 681 682 /* count also the report id */ 683 if (ret > 0) 684 ret++; 685 686 return ret; 687 } 688 689 static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid) 690 { 691 struct usbhid_device *usbhid = hid->driver_data; 692 693 usb_buffer_free(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma); 694 usb_buffer_free(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma); 695 usb_buffer_free(dev, sizeof(*(usbhid->cr)), usbhid->cr, usbhid->cr_dma); 696 usb_buffer_free(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma); 697 } 698 699 static int usbhid_parse(struct hid_device *hid) 700 { 701 struct usb_interface *intf = to_usb_interface(hid->dev.parent); 702 struct usb_host_interface *interface = intf->cur_altsetting; 703 struct usb_device *dev = interface_to_usbdev (intf); 704 struct hid_descriptor *hdesc; 705 u32 quirks = 0; 706 unsigned int rsize = 0; 707 char *rdesc; 708 int ret, n; 709 710 quirks = usbhid_lookup_quirk(le16_to_cpu(dev->descriptor.idVendor), 711 le16_to_cpu(dev->descriptor.idProduct)); 712 713 /* Many keyboards and mice don't like to be polled for reports, 714 * so we will always set the HID_QUIRK_NOGET flag for them. */ 715 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) { 716 if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD || 717 interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE) 718 quirks |= HID_QUIRK_NOGET; 719 } 720 721 if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) && 722 (!interface->desc.bNumEndpoints || 723 usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) { 724 dbg_hid("class descriptor not present\n"); 725 return -ENODEV; 726 } 727 728 hid->version = le16_to_cpu(hdesc->bcdHID); 729 hid->country = hdesc->bCountryCode; 730 731 for (n = 0; n < hdesc->bNumDescriptors; n++) 732 if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT) 733 rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength); 734 735 if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) { 736 dbg_hid("weird size of report descriptor (%u)\n", rsize); 737 return -EINVAL; 738 } 739 740 if (!(rdesc = kmalloc(rsize, GFP_KERNEL))) { 741 dbg_hid("couldn't allocate rdesc memory\n"); 742 return -ENOMEM; 743 } 744 745 hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0); 746 747 ret = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber, 748 HID_DT_REPORT, rdesc, rsize); 749 if (ret < 0) { 750 dbg_hid("reading report descriptor failed\n"); 751 kfree(rdesc); 752 goto err; 753 } 754 755 dbg_hid("report descriptor (size %u, read %d) = ", rsize, n); 756 for (n = 0; n < rsize; n++) 757 dbg_hid_line(" %02x", (unsigned char) rdesc[n]); 758 dbg_hid_line("\n"); 759 760 ret = hid_parse_report(hid, rdesc, rsize); 761 kfree(rdesc); 762 if (ret) { 763 dbg_hid("parsing report descriptor failed\n"); 764 goto err; 765 } 766 767 hid->quirks = quirks; 768 769 return 0; 770 err: 771 return ret; 772 } 773 774 static int usbhid_start(struct hid_device *hid) 775 { 776 struct usb_interface *intf = to_usb_interface(hid->dev.parent); 777 struct usb_host_interface *interface = intf->cur_altsetting; 778 struct usb_device *dev = interface_to_usbdev(intf); 779 struct usbhid_device *usbhid; 780 unsigned int n, insize = 0; 781 int ret; 782 783 WARN_ON(hid->driver_data); 784 785 usbhid = kzalloc(sizeof(struct usbhid_device), GFP_KERNEL); 786 if (usbhid == NULL) { 787 ret = -ENOMEM; 788 goto err; 789 } 790 791 hid->driver_data = usbhid; 792 usbhid->hid = hid; 793 794 usbhid->bufsize = HID_MIN_BUFFER_SIZE; 795 hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize); 796 hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize); 797 hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize); 798 799 if (usbhid->bufsize > HID_MAX_BUFFER_SIZE) 800 usbhid->bufsize = HID_MAX_BUFFER_SIZE; 801 802 hid_find_max_report(hid, HID_INPUT_REPORT, &insize); 803 804 if (insize > HID_MAX_BUFFER_SIZE) 805 insize = HID_MAX_BUFFER_SIZE; 806 807 if (hid_alloc_buffers(dev, hid)) { 808 ret = -ENOMEM; 809 goto fail; 810 } 811 812 for (n = 0; n < interface->desc.bNumEndpoints; n++) { 813 struct usb_endpoint_descriptor *endpoint; 814 int pipe; 815 int interval; 816 817 endpoint = &interface->endpoint[n].desc; 818 if ((endpoint->bmAttributes & 3) != 3) /* Not an interrupt endpoint */ 819 continue; 820 821 interval = endpoint->bInterval; 822 823 /* Some vendors give fullspeed interval on highspeed devides */ 824 if (hid->quirks & HID_QUIRK_FULLSPEED_INTERVAL && 825 dev->speed == USB_SPEED_HIGH) { 826 interval = fls(endpoint->bInterval*8); 827 printk(KERN_INFO "%s: Fixing fullspeed to highspeed interval: %d -> %d\n", 828 hid->name, endpoint->bInterval, interval); 829 } 830 831 /* Change the polling interval of mice. */ 832 if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0) 833 interval = hid_mousepoll_interval; 834 835 ret = -ENOMEM; 836 if (usb_endpoint_dir_in(endpoint)) { 837 if (usbhid->urbin) 838 continue; 839 if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL))) 840 goto fail; 841 pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress); 842 usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize, 843 hid_irq_in, hid, interval); 844 usbhid->urbin->transfer_dma = usbhid->inbuf_dma; 845 usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 846 } else { 847 if (usbhid->urbout) 848 continue; 849 if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL))) 850 goto fail; 851 pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress); 852 usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0, 853 hid_irq_out, hid, interval); 854 usbhid->urbout->transfer_dma = usbhid->outbuf_dma; 855 usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 856 } 857 } 858 859 if (!usbhid->urbin) { 860 err_hid("couldn't find an input interrupt endpoint"); 861 ret = -ENODEV; 862 goto fail; 863 } 864 865 init_waitqueue_head(&usbhid->wait); 866 INIT_WORK(&usbhid->reset_work, hid_reset); 867 setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid); 868 869 spin_lock_init(&usbhid->inlock); 870 spin_lock_init(&usbhid->outlock); 871 spin_lock_init(&usbhid->ctrllock); 872 873 usbhid->intf = intf; 874 usbhid->ifnum = interface->desc.bInterfaceNumber; 875 876 usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL); 877 if (!usbhid->urbctrl) { 878 ret = -ENOMEM; 879 goto fail; 880 } 881 882 usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr, 883 usbhid->ctrlbuf, 1, hid_ctrl, hid); 884 usbhid->urbctrl->setup_dma = usbhid->cr_dma; 885 usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma; 886 usbhid->urbctrl->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP); 887 888 usbhid_init_reports(hid); 889 hid_dump_device(hid); 890 891 return 0; 892 893 fail: 894 usb_free_urb(usbhid->urbin); 895 usb_free_urb(usbhid->urbout); 896 usb_free_urb(usbhid->urbctrl); 897 hid_free_buffers(dev, hid); 898 kfree(usbhid); 899 err: 900 return ret; 901 } 902 903 static void usbhid_stop(struct hid_device *hid) 904 { 905 struct usbhid_device *usbhid = hid->driver_data; 906 907 if (WARN_ON(!usbhid)) 908 return; 909 910 spin_lock_irq(&usbhid->inlock); /* Sync with error handler */ 911 set_bit(HID_DISCONNECTED, &usbhid->iofl); 912 spin_unlock_irq(&usbhid->inlock); 913 usb_kill_urb(usbhid->urbin); 914 usb_kill_urb(usbhid->urbout); 915 usb_kill_urb(usbhid->urbctrl); 916 917 del_timer_sync(&usbhid->io_retry); 918 cancel_work_sync(&usbhid->reset_work); 919 920 if (hid->claimed & HID_CLAIMED_INPUT) 921 hidinput_disconnect(hid); 922 if (hid->claimed & HID_CLAIMED_HIDDEV) 923 hiddev_disconnect(hid); 924 if (hid->claimed & HID_CLAIMED_HIDRAW) 925 hidraw_disconnect(hid); 926 927 hid->claimed = 0; 928 929 usb_free_urb(usbhid->urbin); 930 usb_free_urb(usbhid->urbctrl); 931 usb_free_urb(usbhid->urbout); 932 933 hid_free_buffers(hid_to_usb_dev(hid), hid); 934 kfree(usbhid); 935 hid->driver_data = NULL; 936 } 937 938 static struct hid_ll_driver usb_hid_driver = { 939 .parse = usbhid_parse, 940 .start = usbhid_start, 941 .stop = usbhid_stop, 942 .open = usbhid_open, 943 .close = usbhid_close, 944 .hidinput_input_event = usb_hidinput_input_event, 945 }; 946 947 static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id) 948 { 949 struct usb_device *dev = interface_to_usbdev(intf); 950 struct hid_device *hid; 951 size_t len; 952 int ret; 953 954 dbg_hid("HID probe called for ifnum %d\n", 955 intf->altsetting->desc.bInterfaceNumber); 956 957 hid = hid_allocate_device(); 958 if (IS_ERR(hid)) 959 return PTR_ERR(hid); 960 961 usb_set_intfdata(intf, hid); 962 hid->ll_driver = &usb_hid_driver; 963 hid->hid_output_raw_report = usbhid_output_raw_report; 964 hid->ff_init = hid_pidff_init; 965 #ifdef CONFIG_USB_HIDDEV 966 hid->hiddev_connect = hiddev_connect; 967 hid->hiddev_hid_event = hiddev_hid_event; 968 hid->hiddev_report_event = hiddev_report_event; 969 #endif 970 hid->dev.parent = &intf->dev; 971 hid->bus = BUS_USB; 972 hid->vendor = le16_to_cpu(dev->descriptor.idVendor); 973 hid->product = le16_to_cpu(dev->descriptor.idProduct); 974 hid->name[0] = 0; 975 976 if (dev->manufacturer) 977 strlcpy(hid->name, dev->manufacturer, sizeof(hid->name)); 978 979 if (dev->product) { 980 if (dev->manufacturer) 981 strlcat(hid->name, " ", sizeof(hid->name)); 982 strlcat(hid->name, dev->product, sizeof(hid->name)); 983 } 984 985 if (!strlen(hid->name)) 986 snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x", 987 le16_to_cpu(dev->descriptor.idVendor), 988 le16_to_cpu(dev->descriptor.idProduct)); 989 990 usb_make_path(dev, hid->phys, sizeof(hid->phys)); 991 strlcat(hid->phys, "/input", sizeof(hid->phys)); 992 len = strlen(hid->phys); 993 if (len < sizeof(hid->phys) - 1) 994 snprintf(hid->phys + len, sizeof(hid->phys) - len, 995 "%d", intf->altsetting[0].desc.bInterfaceNumber); 996 997 if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0) 998 hid->uniq[0] = 0; 999 1000 ret = hid_add_device(hid); 1001 if (ret) { 1002 if (ret != -ENODEV) 1003 dev_err(&intf->dev, "can't add hid device: %d\n", ret); 1004 goto err; 1005 } 1006 1007 return 0; 1008 err: 1009 hid_destroy_device(hid); 1010 return ret; 1011 } 1012 1013 static void hid_disconnect(struct usb_interface *intf) 1014 { 1015 struct hid_device *hid = usb_get_intfdata(intf); 1016 1017 if (WARN_ON(!hid)) 1018 return; 1019 1020 hid_destroy_device(hid); 1021 } 1022 1023 static int hid_suspend(struct usb_interface *intf, pm_message_t message) 1024 { 1025 struct hid_device *hid = usb_get_intfdata (intf); 1026 struct usbhid_device *usbhid = hid->driver_data; 1027 1028 spin_lock_irq(&usbhid->inlock); /* Sync with error handler */ 1029 set_bit(HID_SUSPENDED, &usbhid->iofl); 1030 spin_unlock_irq(&usbhid->inlock); 1031 del_timer(&usbhid->io_retry); 1032 usb_kill_urb(usbhid->urbin); 1033 dev_dbg(&intf->dev, "suspend\n"); 1034 return 0; 1035 } 1036 1037 static int hid_resume(struct usb_interface *intf) 1038 { 1039 struct hid_device *hid = usb_get_intfdata (intf); 1040 struct usbhid_device *usbhid = hid->driver_data; 1041 int status; 1042 1043 clear_bit(HID_SUSPENDED, &usbhid->iofl); 1044 usbhid->retry_delay = 0; 1045 status = hid_start_in(hid); 1046 dev_dbg(&intf->dev, "resume status %d\n", status); 1047 return status; 1048 } 1049 1050 /* Treat USB reset pretty much the same as suspend/resume */ 1051 static int hid_pre_reset(struct usb_interface *intf) 1052 { 1053 /* FIXME: What if the interface is already suspended? */ 1054 hid_suspend(intf, PMSG_ON); 1055 return 0; 1056 } 1057 1058 /* Same routine used for post_reset and reset_resume */ 1059 static int hid_post_reset(struct usb_interface *intf) 1060 { 1061 struct usb_device *dev = interface_to_usbdev (intf); 1062 1063 hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0); 1064 /* FIXME: Any more reinitialization needed? */ 1065 1066 return hid_resume(intf); 1067 } 1068 1069 static struct usb_device_id hid_usb_ids [] = { 1070 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 1071 .bInterfaceClass = USB_INTERFACE_CLASS_HID }, 1072 { } /* Terminating entry */ 1073 }; 1074 1075 MODULE_DEVICE_TABLE (usb, hid_usb_ids); 1076 1077 static struct usb_driver hid_driver = { 1078 .name = "usbhid", 1079 .probe = hid_probe, 1080 .disconnect = hid_disconnect, 1081 .suspend = hid_suspend, 1082 .resume = hid_resume, 1083 .reset_resume = hid_post_reset, 1084 .pre_reset = hid_pre_reset, 1085 .post_reset = hid_post_reset, 1086 .id_table = hid_usb_ids, 1087 .supports_autosuspend = 1, 1088 }; 1089 1090 static const struct hid_device_id hid_usb_table[] = { 1091 { HID_USB_DEVICE(HID_ANY_ID, HID_ANY_ID) }, 1092 { } 1093 }; 1094 1095 static struct hid_driver hid_usb_driver = { 1096 .name = "generic-usb", 1097 .id_table = hid_usb_table, 1098 }; 1099 1100 static int __init hid_init(void) 1101 { 1102 int retval; 1103 retval = hid_register_driver(&hid_usb_driver); 1104 if (retval) 1105 goto hid_register_fail; 1106 retval = usbhid_quirks_init(quirks_param); 1107 if (retval) 1108 goto usbhid_quirks_init_fail; 1109 retval = hiddev_init(); 1110 if (retval) 1111 goto hiddev_init_fail; 1112 retval = usb_register(&hid_driver); 1113 if (retval) 1114 goto usb_register_fail; 1115 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 1116 DRIVER_DESC "\n"); 1117 1118 return 0; 1119 usb_register_fail: 1120 hiddev_exit(); 1121 hiddev_init_fail: 1122 usbhid_quirks_exit(); 1123 usbhid_quirks_init_fail: 1124 hid_unregister_driver(&hid_usb_driver); 1125 hid_register_fail: 1126 return retval; 1127 } 1128 1129 static void __exit hid_exit(void) 1130 { 1131 usb_deregister(&hid_driver); 1132 hiddev_exit(); 1133 usbhid_quirks_exit(); 1134 hid_unregister_driver(&hid_usb_driver); 1135 } 1136 1137 module_init(hid_init); 1138 module_exit(hid_exit); 1139 1140 MODULE_AUTHOR(DRIVER_AUTHOR); 1141 MODULE_DESCRIPTION(DRIVER_DESC); 1142 MODULE_LICENSE(DRIVER_LICENSE); 1143