1 /* 2 HIDP implementation for Linux Bluetooth stack (BlueZ). 3 Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org> 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License version 2 as 7 published by the Free Software Foundation; 8 9 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 10 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 11 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 12 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 13 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 14 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 18 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 19 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 20 SOFTWARE IS DISCLAIMED. 21 */ 22 23 #include <linux/module.h> 24 25 #include <linux/types.h> 26 #include <linux/errno.h> 27 #include <linux/kernel.h> 28 #include <linux/sched.h> 29 #include <linux/slab.h> 30 #include <linux/poll.h> 31 #include <linux/freezer.h> 32 #include <linux/fcntl.h> 33 #include <linux/skbuff.h> 34 #include <linux/socket.h> 35 #include <linux/ioctl.h> 36 #include <linux/file.h> 37 #include <linux/init.h> 38 #include <linux/wait.h> 39 #include <linux/mutex.h> 40 #include <linux/kthread.h> 41 #include <net/sock.h> 42 43 #include <linux/input.h> 44 #include <linux/hid.h> 45 #include <linux/hidraw.h> 46 47 #include <net/bluetooth/bluetooth.h> 48 #include <net/bluetooth/hci_core.h> 49 #include <net/bluetooth/l2cap.h> 50 51 #include "hidp.h" 52 53 #define VERSION "1.2" 54 55 static DECLARE_RWSEM(hidp_session_sem); 56 static LIST_HEAD(hidp_session_list); 57 58 static unsigned char hidp_keycode[256] = { 59 0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 60 37, 38, 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 61 21, 44, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 28, 1, 62 14, 15, 57, 12, 13, 26, 27, 43, 43, 39, 40, 41, 51, 52, 63 53, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 87, 88, 64 99, 70, 119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103, 69, 65 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71, 72, 73, 66 82, 83, 86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189, 190, 67 191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135, 68 136, 113, 115, 114, 0, 0, 0, 121, 0, 89, 93, 124, 92, 94, 69 95, 0, 0, 0, 122, 123, 90, 91, 85, 0, 0, 0, 0, 0, 70 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 71 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 72 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 73 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 74 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 75 29, 42, 56, 125, 97, 54, 100, 126, 164, 166, 165, 163, 161, 115, 76 114, 113, 150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140 77 }; 78 79 static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 }; 80 81 static struct hidp_session *__hidp_get_session(bdaddr_t *bdaddr) 82 { 83 struct hidp_session *session; 84 85 BT_DBG(""); 86 87 list_for_each_entry(session, &hidp_session_list, list) { 88 if (!bacmp(bdaddr, &session->bdaddr)) 89 return session; 90 } 91 92 return NULL; 93 } 94 95 static void __hidp_link_session(struct hidp_session *session) 96 { 97 list_add(&session->list, &hidp_session_list); 98 } 99 100 static void __hidp_unlink_session(struct hidp_session *session) 101 { 102 hci_conn_put_device(session->conn); 103 104 list_del(&session->list); 105 } 106 107 static void __hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci) 108 { 109 memset(ci, 0, sizeof(*ci)); 110 bacpy(&ci->bdaddr, &session->bdaddr); 111 112 ci->flags = session->flags; 113 ci->state = session->state; 114 115 ci->vendor = 0x0000; 116 ci->product = 0x0000; 117 ci->version = 0x0000; 118 119 if (session->input) { 120 ci->vendor = session->input->id.vendor; 121 ci->product = session->input->id.product; 122 ci->version = session->input->id.version; 123 if (session->input->name) 124 strncpy(ci->name, session->input->name, 128); 125 else 126 strncpy(ci->name, "HID Boot Device", 128); 127 } 128 129 if (session->hid) { 130 ci->vendor = session->hid->vendor; 131 ci->product = session->hid->product; 132 ci->version = session->hid->version; 133 strncpy(ci->name, session->hid->name, 128); 134 } 135 } 136 137 static int hidp_queue_event(struct hidp_session *session, struct input_dev *dev, 138 unsigned int type, unsigned int code, int value) 139 { 140 unsigned char newleds; 141 struct sk_buff *skb; 142 143 BT_DBG("session %p type %d code %d value %d", session, type, code, value); 144 145 if (type != EV_LED) 146 return -1; 147 148 newleds = (!!test_bit(LED_KANA, dev->led) << 3) | 149 (!!test_bit(LED_COMPOSE, dev->led) << 3) | 150 (!!test_bit(LED_SCROLLL, dev->led) << 2) | 151 (!!test_bit(LED_CAPSL, dev->led) << 1) | 152 (!!test_bit(LED_NUML, dev->led)); 153 154 if (session->leds == newleds) 155 return 0; 156 157 session->leds = newleds; 158 159 skb = alloc_skb(3, GFP_ATOMIC); 160 if (!skb) { 161 BT_ERR("Can't allocate memory for new frame"); 162 return -ENOMEM; 163 } 164 165 *skb_put(skb, 1) = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT; 166 *skb_put(skb, 1) = 0x01; 167 *skb_put(skb, 1) = newleds; 168 169 skb_queue_tail(&session->intr_transmit, skb); 170 171 hidp_schedule(session); 172 173 return 0; 174 } 175 176 static int hidp_hidinput_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 177 { 178 struct hid_device *hid = input_get_drvdata(dev); 179 struct hidp_session *session = hid->driver_data; 180 181 return hidp_queue_event(session, dev, type, code, value); 182 } 183 184 static int hidp_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) 185 { 186 struct hidp_session *session = input_get_drvdata(dev); 187 188 return hidp_queue_event(session, dev, type, code, value); 189 } 190 191 static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb) 192 { 193 struct input_dev *dev = session->input; 194 unsigned char *keys = session->keys; 195 unsigned char *udata = skb->data + 1; 196 signed char *sdata = skb->data + 1; 197 int i, size = skb->len - 1; 198 199 switch (skb->data[0]) { 200 case 0x01: /* Keyboard report */ 201 for (i = 0; i < 8; i++) 202 input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1); 203 204 /* If all the key codes have been set to 0x01, it means 205 * too many keys were pressed at the same time. */ 206 if (!memcmp(udata + 2, hidp_mkeyspat, 6)) 207 break; 208 209 for (i = 2; i < 8; i++) { 210 if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) { 211 if (hidp_keycode[keys[i]]) 212 input_report_key(dev, hidp_keycode[keys[i]], 0); 213 else 214 BT_ERR("Unknown key (scancode %#x) released.", keys[i]); 215 } 216 217 if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) { 218 if (hidp_keycode[udata[i]]) 219 input_report_key(dev, hidp_keycode[udata[i]], 1); 220 else 221 BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]); 222 } 223 } 224 225 memcpy(keys, udata, 8); 226 break; 227 228 case 0x02: /* Mouse report */ 229 input_report_key(dev, BTN_LEFT, sdata[0] & 0x01); 230 input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02); 231 input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04); 232 input_report_key(dev, BTN_SIDE, sdata[0] & 0x08); 233 input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10); 234 235 input_report_rel(dev, REL_X, sdata[1]); 236 input_report_rel(dev, REL_Y, sdata[2]); 237 238 if (size > 3) 239 input_report_rel(dev, REL_WHEEL, sdata[3]); 240 break; 241 } 242 243 input_sync(dev); 244 } 245 246 static int __hidp_send_ctrl_message(struct hidp_session *session, 247 unsigned char hdr, unsigned char *data, int size) 248 { 249 struct sk_buff *skb; 250 251 BT_DBG("session %p data %p size %d", session, data, size); 252 253 if (atomic_read(&session->terminate)) 254 return -EIO; 255 256 skb = alloc_skb(size + 1, GFP_ATOMIC); 257 if (!skb) { 258 BT_ERR("Can't allocate memory for new frame"); 259 return -ENOMEM; 260 } 261 262 *skb_put(skb, 1) = hdr; 263 if (data && size > 0) 264 memcpy(skb_put(skb, size), data, size); 265 266 skb_queue_tail(&session->ctrl_transmit, skb); 267 268 return 0; 269 } 270 271 static inline int hidp_send_ctrl_message(struct hidp_session *session, 272 unsigned char hdr, unsigned char *data, int size) 273 { 274 int err; 275 276 err = __hidp_send_ctrl_message(session, hdr, data, size); 277 278 hidp_schedule(session); 279 280 return err; 281 } 282 283 static int hidp_queue_report(struct hidp_session *session, 284 unsigned char *data, int size) 285 { 286 struct sk_buff *skb; 287 288 BT_DBG("session %p hid %p data %p size %d", session, session->hid, data, size); 289 290 skb = alloc_skb(size + 1, GFP_ATOMIC); 291 if (!skb) { 292 BT_ERR("Can't allocate memory for new frame"); 293 return -ENOMEM; 294 } 295 296 *skb_put(skb, 1) = 0xa2; 297 if (size > 0) 298 memcpy(skb_put(skb, size), data, size); 299 300 skb_queue_tail(&session->intr_transmit, skb); 301 302 hidp_schedule(session); 303 304 return 0; 305 } 306 307 static int hidp_send_report(struct hidp_session *session, struct hid_report *report) 308 { 309 unsigned char buf[32]; 310 int rsize; 311 312 rsize = ((report->size - 1) >> 3) + 1 + (report->id > 0); 313 if (rsize > sizeof(buf)) 314 return -EIO; 315 316 hid_output_report(report, buf); 317 318 return hidp_queue_report(session, buf, rsize); 319 } 320 321 static int hidp_get_raw_report(struct hid_device *hid, 322 unsigned char report_number, 323 unsigned char *data, size_t count, 324 unsigned char report_type) 325 { 326 struct hidp_session *session = hid->driver_data; 327 struct sk_buff *skb; 328 size_t len; 329 int numbered_reports = hid->report_enum[report_type].numbered; 330 int ret; 331 332 switch (report_type) { 333 case HID_FEATURE_REPORT: 334 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE; 335 break; 336 case HID_INPUT_REPORT: 337 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT; 338 break; 339 case HID_OUTPUT_REPORT: 340 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT; 341 break; 342 default: 343 return -EINVAL; 344 } 345 346 if (mutex_lock_interruptible(&session->report_mutex)) 347 return -ERESTARTSYS; 348 349 /* Set up our wait, and send the report request to the device. */ 350 session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK; 351 session->waiting_report_number = numbered_reports ? report_number : -1; 352 set_bit(HIDP_WAITING_FOR_RETURN, &session->flags); 353 data[0] = report_number; 354 ret = hidp_send_ctrl_message(hid->driver_data, report_type, data, 1); 355 if (ret) 356 goto err; 357 358 /* Wait for the return of the report. The returned report 359 gets put in session->report_return. */ 360 while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)) { 361 int res; 362 363 res = wait_event_interruptible_timeout(session->report_queue, 364 !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags), 365 5*HZ); 366 if (res == 0) { 367 /* timeout */ 368 ret = -EIO; 369 goto err; 370 } 371 if (res < 0) { 372 /* signal */ 373 ret = -ERESTARTSYS; 374 goto err; 375 } 376 } 377 378 skb = session->report_return; 379 if (skb) { 380 len = skb->len < count ? skb->len : count; 381 memcpy(data, skb->data, len); 382 383 kfree_skb(skb); 384 session->report_return = NULL; 385 } else { 386 /* Device returned a HANDSHAKE, indicating protocol error. */ 387 len = -EIO; 388 } 389 390 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); 391 mutex_unlock(&session->report_mutex); 392 393 return len; 394 395 err: 396 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); 397 mutex_unlock(&session->report_mutex); 398 return ret; 399 } 400 401 static int hidp_output_raw_report(struct hid_device *hid, unsigned char *data, size_t count, 402 unsigned char report_type) 403 { 404 struct hidp_session *session = hid->driver_data; 405 int ret; 406 407 switch (report_type) { 408 case HID_FEATURE_REPORT: 409 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE; 410 break; 411 case HID_OUTPUT_REPORT: 412 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT; 413 break; 414 default: 415 return -EINVAL; 416 } 417 418 if (mutex_lock_interruptible(&session->report_mutex)) 419 return -ERESTARTSYS; 420 421 /* Set up our wait, and send the report request to the device. */ 422 set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags); 423 ret = hidp_send_ctrl_message(hid->driver_data, report_type, data, 424 count); 425 if (ret) 426 goto err; 427 428 /* Wait for the ACK from the device. */ 429 while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) { 430 int res; 431 432 res = wait_event_interruptible_timeout(session->report_queue, 433 !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags), 434 10*HZ); 435 if (res == 0) { 436 /* timeout */ 437 ret = -EIO; 438 goto err; 439 } 440 if (res < 0) { 441 /* signal */ 442 ret = -ERESTARTSYS; 443 goto err; 444 } 445 } 446 447 if (!session->output_report_success) { 448 ret = -EIO; 449 goto err; 450 } 451 452 ret = count; 453 454 err: 455 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags); 456 mutex_unlock(&session->report_mutex); 457 return ret; 458 } 459 460 static void hidp_idle_timeout(unsigned long arg) 461 { 462 struct hidp_session *session = (struct hidp_session *) arg; 463 464 atomic_inc(&session->terminate); 465 wake_up_process(session->task); 466 } 467 468 static void hidp_set_timer(struct hidp_session *session) 469 { 470 if (session->idle_to > 0) 471 mod_timer(&session->timer, jiffies + HZ * session->idle_to); 472 } 473 474 static inline void hidp_del_timer(struct hidp_session *session) 475 { 476 if (session->idle_to > 0) 477 del_timer(&session->timer); 478 } 479 480 static void hidp_process_handshake(struct hidp_session *session, 481 unsigned char param) 482 { 483 BT_DBG("session %p param 0x%02x", session, param); 484 session->output_report_success = 0; /* default condition */ 485 486 switch (param) { 487 case HIDP_HSHK_SUCCESSFUL: 488 /* FIXME: Call into SET_ GET_ handlers here */ 489 session->output_report_success = 1; 490 break; 491 492 case HIDP_HSHK_NOT_READY: 493 case HIDP_HSHK_ERR_INVALID_REPORT_ID: 494 case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST: 495 case HIDP_HSHK_ERR_INVALID_PARAMETER: 496 if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags)) 497 wake_up_interruptible(&session->report_queue); 498 499 /* FIXME: Call into SET_ GET_ handlers here */ 500 break; 501 502 case HIDP_HSHK_ERR_UNKNOWN: 503 break; 504 505 case HIDP_HSHK_ERR_FATAL: 506 /* Device requests a reboot, as this is the only way this error 507 * can be recovered. */ 508 __hidp_send_ctrl_message(session, 509 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0); 510 break; 511 512 default: 513 __hidp_send_ctrl_message(session, 514 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); 515 break; 516 } 517 518 /* Wake up the waiting thread. */ 519 if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) 520 wake_up_interruptible(&session->report_queue); 521 } 522 523 static void hidp_process_hid_control(struct hidp_session *session, 524 unsigned char param) 525 { 526 BT_DBG("session %p param 0x%02x", session, param); 527 528 if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) { 529 /* Flush the transmit queues */ 530 skb_queue_purge(&session->ctrl_transmit); 531 skb_queue_purge(&session->intr_transmit); 532 533 atomic_inc(&session->terminate); 534 wake_up_process(current); 535 } 536 } 537 538 /* Returns true if the passed-in skb should be freed by the caller. */ 539 static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb, 540 unsigned char param) 541 { 542 int done_with_skb = 1; 543 BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param); 544 545 switch (param) { 546 case HIDP_DATA_RTYPE_INPUT: 547 hidp_set_timer(session); 548 549 if (session->input) 550 hidp_input_report(session, skb); 551 552 if (session->hid) 553 hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 0); 554 break; 555 556 case HIDP_DATA_RTYPE_OTHER: 557 case HIDP_DATA_RTYPE_OUPUT: 558 case HIDP_DATA_RTYPE_FEATURE: 559 break; 560 561 default: 562 __hidp_send_ctrl_message(session, 563 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); 564 } 565 566 if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) && 567 param == session->waiting_report_type) { 568 if (session->waiting_report_number < 0 || 569 session->waiting_report_number == skb->data[0]) { 570 /* hidp_get_raw_report() is waiting on this report. */ 571 session->report_return = skb; 572 done_with_skb = 0; 573 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); 574 wake_up_interruptible(&session->report_queue); 575 } 576 } 577 578 return done_with_skb; 579 } 580 581 static void hidp_recv_ctrl_frame(struct hidp_session *session, 582 struct sk_buff *skb) 583 { 584 unsigned char hdr, type, param; 585 int free_skb = 1; 586 587 BT_DBG("session %p skb %p len %d", session, skb, skb->len); 588 589 hdr = skb->data[0]; 590 skb_pull(skb, 1); 591 592 type = hdr & HIDP_HEADER_TRANS_MASK; 593 param = hdr & HIDP_HEADER_PARAM_MASK; 594 595 switch (type) { 596 case HIDP_TRANS_HANDSHAKE: 597 hidp_process_handshake(session, param); 598 break; 599 600 case HIDP_TRANS_HID_CONTROL: 601 hidp_process_hid_control(session, param); 602 break; 603 604 case HIDP_TRANS_DATA: 605 free_skb = hidp_process_data(session, skb, param); 606 break; 607 608 default: 609 __hidp_send_ctrl_message(session, 610 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0); 611 break; 612 } 613 614 if (free_skb) 615 kfree_skb(skb); 616 } 617 618 static void hidp_recv_intr_frame(struct hidp_session *session, 619 struct sk_buff *skb) 620 { 621 unsigned char hdr; 622 623 BT_DBG("session %p skb %p len %d", session, skb, skb->len); 624 625 hdr = skb->data[0]; 626 skb_pull(skb, 1); 627 628 if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) { 629 hidp_set_timer(session); 630 631 if (session->input) 632 hidp_input_report(session, skb); 633 634 if (session->hid) { 635 hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 1); 636 BT_DBG("report len %d", skb->len); 637 } 638 } else { 639 BT_DBG("Unsupported protocol header 0x%02x", hdr); 640 } 641 642 kfree_skb(skb); 643 } 644 645 static int hidp_send_frame(struct socket *sock, unsigned char *data, int len) 646 { 647 struct kvec iv = { data, len }; 648 struct msghdr msg; 649 650 BT_DBG("sock %p data %p len %d", sock, data, len); 651 652 if (!len) 653 return 0; 654 655 memset(&msg, 0, sizeof(msg)); 656 657 return kernel_sendmsg(sock, &msg, &iv, 1, len); 658 } 659 660 static void hidp_process_intr_transmit(struct hidp_session *session) 661 { 662 struct sk_buff *skb; 663 664 BT_DBG("session %p", session); 665 666 while ((skb = skb_dequeue(&session->intr_transmit))) { 667 if (hidp_send_frame(session->intr_sock, skb->data, skb->len) < 0) { 668 skb_queue_head(&session->intr_transmit, skb); 669 break; 670 } 671 672 hidp_set_timer(session); 673 kfree_skb(skb); 674 } 675 } 676 677 static void hidp_process_ctrl_transmit(struct hidp_session *session) 678 { 679 struct sk_buff *skb; 680 681 BT_DBG("session %p", session); 682 683 while ((skb = skb_dequeue(&session->ctrl_transmit))) { 684 if (hidp_send_frame(session->ctrl_sock, skb->data, skb->len) < 0) { 685 skb_queue_head(&session->ctrl_transmit, skb); 686 break; 687 } 688 689 hidp_set_timer(session); 690 kfree_skb(skb); 691 } 692 } 693 694 static int hidp_session(void *arg) 695 { 696 struct hidp_session *session = arg; 697 struct sock *ctrl_sk = session->ctrl_sock->sk; 698 struct sock *intr_sk = session->intr_sock->sk; 699 struct sk_buff *skb; 700 wait_queue_t ctrl_wait, intr_wait; 701 702 BT_DBG("session %p", session); 703 704 __module_get(THIS_MODULE); 705 set_user_nice(current, -15); 706 707 init_waitqueue_entry(&ctrl_wait, current); 708 init_waitqueue_entry(&intr_wait, current); 709 add_wait_queue(sk_sleep(ctrl_sk), &ctrl_wait); 710 add_wait_queue(sk_sleep(intr_sk), &intr_wait); 711 session->waiting_for_startup = 0; 712 wake_up_interruptible(&session->startup_queue); 713 set_current_state(TASK_INTERRUPTIBLE); 714 while (!atomic_read(&session->terminate)) { 715 if (ctrl_sk->sk_state != BT_CONNECTED || 716 intr_sk->sk_state != BT_CONNECTED) 717 break; 718 719 while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) { 720 skb_orphan(skb); 721 if (!skb_linearize(skb)) 722 hidp_recv_intr_frame(session, skb); 723 else 724 kfree_skb(skb); 725 } 726 727 hidp_process_intr_transmit(session); 728 729 while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) { 730 skb_orphan(skb); 731 if (!skb_linearize(skb)) 732 hidp_recv_ctrl_frame(session, skb); 733 else 734 kfree_skb(skb); 735 } 736 737 hidp_process_ctrl_transmit(session); 738 739 schedule(); 740 set_current_state(TASK_INTERRUPTIBLE); 741 } 742 set_current_state(TASK_RUNNING); 743 remove_wait_queue(sk_sleep(intr_sk), &intr_wait); 744 remove_wait_queue(sk_sleep(ctrl_sk), &ctrl_wait); 745 746 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags); 747 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); 748 wake_up_interruptible(&session->report_queue); 749 750 down_write(&hidp_session_sem); 751 752 hidp_del_timer(session); 753 754 if (session->input) { 755 input_unregister_device(session->input); 756 session->input = NULL; 757 } 758 759 if (session->hid) { 760 hid_destroy_device(session->hid); 761 session->hid = NULL; 762 } 763 764 /* Wakeup user-space polling for socket errors */ 765 session->intr_sock->sk->sk_err = EUNATCH; 766 session->ctrl_sock->sk->sk_err = EUNATCH; 767 768 hidp_schedule(session); 769 770 fput(session->intr_sock->file); 771 772 wait_event_timeout(*(sk_sleep(ctrl_sk)), 773 (ctrl_sk->sk_state == BT_CLOSED), msecs_to_jiffies(500)); 774 775 fput(session->ctrl_sock->file); 776 777 __hidp_unlink_session(session); 778 779 up_write(&hidp_session_sem); 780 781 kfree(session->rd_data); 782 kfree(session); 783 module_put_and_exit(0); 784 return 0; 785 } 786 787 static struct hci_conn *hidp_get_connection(struct hidp_session *session) 788 { 789 bdaddr_t *src = &bt_sk(session->ctrl_sock->sk)->src; 790 bdaddr_t *dst = &bt_sk(session->ctrl_sock->sk)->dst; 791 struct hci_conn *conn; 792 struct hci_dev *hdev; 793 794 hdev = hci_get_route(dst, src); 795 if (!hdev) 796 return NULL; 797 798 hci_dev_lock(hdev); 799 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst); 800 if (conn) 801 hci_conn_hold_device(conn); 802 hci_dev_unlock(hdev); 803 804 hci_dev_put(hdev); 805 806 return conn; 807 } 808 809 static int hidp_setup_input(struct hidp_session *session, 810 struct hidp_connadd_req *req) 811 { 812 struct input_dev *input; 813 int i; 814 815 input = input_allocate_device(); 816 if (!input) 817 return -ENOMEM; 818 819 session->input = input; 820 821 input_set_drvdata(input, session); 822 823 input->name = "Bluetooth HID Boot Protocol Device"; 824 825 input->id.bustype = BUS_BLUETOOTH; 826 input->id.vendor = req->vendor; 827 input->id.product = req->product; 828 input->id.version = req->version; 829 830 if (req->subclass & 0x40) { 831 set_bit(EV_KEY, input->evbit); 832 set_bit(EV_LED, input->evbit); 833 set_bit(EV_REP, input->evbit); 834 835 set_bit(LED_NUML, input->ledbit); 836 set_bit(LED_CAPSL, input->ledbit); 837 set_bit(LED_SCROLLL, input->ledbit); 838 set_bit(LED_COMPOSE, input->ledbit); 839 set_bit(LED_KANA, input->ledbit); 840 841 for (i = 0; i < sizeof(hidp_keycode); i++) 842 set_bit(hidp_keycode[i], input->keybit); 843 clear_bit(0, input->keybit); 844 } 845 846 if (req->subclass & 0x80) { 847 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); 848 input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) | 849 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE); 850 input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); 851 input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) | 852 BIT_MASK(BTN_EXTRA); 853 input->relbit[0] |= BIT_MASK(REL_WHEEL); 854 } 855 856 input->dev.parent = &session->conn->dev; 857 858 input->event = hidp_input_event; 859 860 return 0; 861 } 862 863 static int hidp_open(struct hid_device *hid) 864 { 865 return 0; 866 } 867 868 static void hidp_close(struct hid_device *hid) 869 { 870 } 871 872 static int hidp_parse(struct hid_device *hid) 873 { 874 struct hidp_session *session = hid->driver_data; 875 876 return hid_parse_report(session->hid, session->rd_data, 877 session->rd_size); 878 } 879 880 static int hidp_start(struct hid_device *hid) 881 { 882 struct hidp_session *session = hid->driver_data; 883 struct hid_report *report; 884 885 if (hid->quirks & HID_QUIRK_NO_INIT_REPORTS) 886 return 0; 887 888 list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT]. 889 report_list, list) 890 hidp_send_report(session, report); 891 892 list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT]. 893 report_list, list) 894 hidp_send_report(session, report); 895 896 return 0; 897 } 898 899 static void hidp_stop(struct hid_device *hid) 900 { 901 struct hidp_session *session = hid->driver_data; 902 903 skb_queue_purge(&session->ctrl_transmit); 904 skb_queue_purge(&session->intr_transmit); 905 906 hid->claimed = 0; 907 } 908 909 static struct hid_ll_driver hidp_hid_driver = { 910 .parse = hidp_parse, 911 .start = hidp_start, 912 .stop = hidp_stop, 913 .open = hidp_open, 914 .close = hidp_close, 915 .hidinput_input_event = hidp_hidinput_event, 916 }; 917 918 /* This function sets up the hid device. It does not add it 919 to the HID system. That is done in hidp_add_connection(). */ 920 static int hidp_setup_hid(struct hidp_session *session, 921 struct hidp_connadd_req *req) 922 { 923 struct hid_device *hid; 924 int err; 925 926 session->rd_data = kzalloc(req->rd_size, GFP_KERNEL); 927 if (!session->rd_data) 928 return -ENOMEM; 929 930 if (copy_from_user(session->rd_data, req->rd_data, req->rd_size)) { 931 err = -EFAULT; 932 goto fault; 933 } 934 session->rd_size = req->rd_size; 935 936 hid = hid_allocate_device(); 937 if (IS_ERR(hid)) { 938 err = PTR_ERR(hid); 939 goto fault; 940 } 941 942 session->hid = hid; 943 944 hid->driver_data = session; 945 946 hid->bus = BUS_BLUETOOTH; 947 hid->vendor = req->vendor; 948 hid->product = req->product; 949 hid->version = req->version; 950 hid->country = req->country; 951 952 strncpy(hid->name, req->name, 128); 953 strncpy(hid->phys, batostr(&bt_sk(session->ctrl_sock->sk)->src), 64); 954 strncpy(hid->uniq, batostr(&bt_sk(session->ctrl_sock->sk)->dst), 64); 955 956 hid->dev.parent = &session->conn->dev; 957 hid->ll_driver = &hidp_hid_driver; 958 959 hid->hid_get_raw_report = hidp_get_raw_report; 960 hid->hid_output_raw_report = hidp_output_raw_report; 961 962 return 0; 963 964 fault: 965 kfree(session->rd_data); 966 session->rd_data = NULL; 967 968 return err; 969 } 970 971 int hidp_add_connection(struct hidp_connadd_req *req, struct socket *ctrl_sock, struct socket *intr_sock) 972 { 973 struct hidp_session *session, *s; 974 int vendor, product; 975 int err; 976 977 BT_DBG(""); 978 979 if (bacmp(&bt_sk(ctrl_sock->sk)->src, &bt_sk(intr_sock->sk)->src) || 980 bacmp(&bt_sk(ctrl_sock->sk)->dst, &bt_sk(intr_sock->sk)->dst)) 981 return -ENOTUNIQ; 982 983 BT_DBG("rd_data %p rd_size %d", req->rd_data, req->rd_size); 984 985 down_write(&hidp_session_sem); 986 987 s = __hidp_get_session(&bt_sk(ctrl_sock->sk)->dst); 988 if (s && s->state == BT_CONNECTED) { 989 up_write(&hidp_session_sem); 990 return -EEXIST; 991 } 992 993 session = kzalloc(sizeof(struct hidp_session), GFP_KERNEL); 994 if (!session) { 995 up_write(&hidp_session_sem); 996 return -ENOMEM; 997 } 998 999 bacpy(&session->bdaddr, &bt_sk(ctrl_sock->sk)->dst); 1000 1001 session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl_sock->sk)->chan->omtu, 1002 l2cap_pi(ctrl_sock->sk)->chan->imtu); 1003 session->intr_mtu = min_t(uint, l2cap_pi(intr_sock->sk)->chan->omtu, 1004 l2cap_pi(intr_sock->sk)->chan->imtu); 1005 1006 BT_DBG("ctrl mtu %d intr mtu %d", session->ctrl_mtu, session->intr_mtu); 1007 1008 session->ctrl_sock = ctrl_sock; 1009 session->intr_sock = intr_sock; 1010 session->state = BT_CONNECTED; 1011 1012 session->conn = hidp_get_connection(session); 1013 if (!session->conn) { 1014 err = -ENOTCONN; 1015 goto failed; 1016 } 1017 1018 setup_timer(&session->timer, hidp_idle_timeout, (unsigned long)session); 1019 1020 skb_queue_head_init(&session->ctrl_transmit); 1021 skb_queue_head_init(&session->intr_transmit); 1022 1023 mutex_init(&session->report_mutex); 1024 init_waitqueue_head(&session->report_queue); 1025 init_waitqueue_head(&session->startup_queue); 1026 session->waiting_for_startup = 1; 1027 session->flags = req->flags & (1 << HIDP_BLUETOOTH_VENDOR_ID); 1028 session->idle_to = req->idle_to; 1029 1030 __hidp_link_session(session); 1031 1032 if (req->rd_size > 0) { 1033 err = hidp_setup_hid(session, req); 1034 if (err) 1035 goto purge; 1036 } 1037 1038 if (!session->hid) { 1039 err = hidp_setup_input(session, req); 1040 if (err < 0) 1041 goto purge; 1042 } 1043 1044 hidp_set_timer(session); 1045 1046 if (session->hid) { 1047 vendor = session->hid->vendor; 1048 product = session->hid->product; 1049 } else if (session->input) { 1050 vendor = session->input->id.vendor; 1051 product = session->input->id.product; 1052 } else { 1053 vendor = 0x0000; 1054 product = 0x0000; 1055 } 1056 1057 session->task = kthread_run(hidp_session, session, "khidpd_%04x%04x", 1058 vendor, product); 1059 if (IS_ERR(session->task)) { 1060 err = PTR_ERR(session->task); 1061 goto unlink; 1062 } 1063 1064 while (session->waiting_for_startup) { 1065 wait_event_interruptible(session->startup_queue, 1066 !session->waiting_for_startup); 1067 } 1068 1069 if (session->hid) 1070 err = hid_add_device(session->hid); 1071 else 1072 err = input_register_device(session->input); 1073 1074 if (err < 0) { 1075 atomic_inc(&session->terminate); 1076 wake_up_process(session->task); 1077 up_write(&hidp_session_sem); 1078 return err; 1079 } 1080 1081 if (session->input) { 1082 hidp_send_ctrl_message(session, 1083 HIDP_TRANS_SET_PROTOCOL | HIDP_PROTO_BOOT, NULL, 0); 1084 session->flags |= (1 << HIDP_BOOT_PROTOCOL_MODE); 1085 1086 session->leds = 0xff; 1087 hidp_input_event(session->input, EV_LED, 0, 0); 1088 } 1089 1090 up_write(&hidp_session_sem); 1091 return 0; 1092 1093 unlink: 1094 hidp_del_timer(session); 1095 1096 if (session->input) { 1097 input_unregister_device(session->input); 1098 session->input = NULL; 1099 } 1100 1101 if (session->hid) { 1102 hid_destroy_device(session->hid); 1103 session->hid = NULL; 1104 } 1105 1106 kfree(session->rd_data); 1107 session->rd_data = NULL; 1108 1109 purge: 1110 __hidp_unlink_session(session); 1111 1112 skb_queue_purge(&session->ctrl_transmit); 1113 skb_queue_purge(&session->intr_transmit); 1114 1115 failed: 1116 up_write(&hidp_session_sem); 1117 1118 kfree(session); 1119 return err; 1120 } 1121 1122 int hidp_del_connection(struct hidp_conndel_req *req) 1123 { 1124 struct hidp_session *session; 1125 int err = 0; 1126 1127 BT_DBG(""); 1128 1129 down_read(&hidp_session_sem); 1130 1131 session = __hidp_get_session(&req->bdaddr); 1132 if (session) { 1133 if (req->flags & (1 << HIDP_VIRTUAL_CABLE_UNPLUG)) { 1134 hidp_send_ctrl_message(session, 1135 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG, NULL, 0); 1136 } else { 1137 /* Flush the transmit queues */ 1138 skb_queue_purge(&session->ctrl_transmit); 1139 skb_queue_purge(&session->intr_transmit); 1140 1141 atomic_inc(&session->terminate); 1142 wake_up_process(session->task); 1143 } 1144 } else 1145 err = -ENOENT; 1146 1147 up_read(&hidp_session_sem); 1148 return err; 1149 } 1150 1151 int hidp_get_connlist(struct hidp_connlist_req *req) 1152 { 1153 struct hidp_session *session; 1154 int err = 0, n = 0; 1155 1156 BT_DBG(""); 1157 1158 down_read(&hidp_session_sem); 1159 1160 list_for_each_entry(session, &hidp_session_list, list) { 1161 struct hidp_conninfo ci; 1162 1163 __hidp_copy_session(session, &ci); 1164 1165 if (copy_to_user(req->ci, &ci, sizeof(ci))) { 1166 err = -EFAULT; 1167 break; 1168 } 1169 1170 if (++n >= req->cnum) 1171 break; 1172 1173 req->ci++; 1174 } 1175 req->cnum = n; 1176 1177 up_read(&hidp_session_sem); 1178 return err; 1179 } 1180 1181 int hidp_get_conninfo(struct hidp_conninfo *ci) 1182 { 1183 struct hidp_session *session; 1184 int err = 0; 1185 1186 down_read(&hidp_session_sem); 1187 1188 session = __hidp_get_session(&ci->bdaddr); 1189 if (session) 1190 __hidp_copy_session(session, ci); 1191 else 1192 err = -ENOENT; 1193 1194 up_read(&hidp_session_sem); 1195 return err; 1196 } 1197 1198 static const struct hid_device_id hidp_table[] = { 1199 { HID_BLUETOOTH_DEVICE(HID_ANY_ID, HID_ANY_ID) }, 1200 { } 1201 }; 1202 1203 static struct hid_driver hidp_driver = { 1204 .name = "generic-bluetooth", 1205 .id_table = hidp_table, 1206 }; 1207 1208 static int __init hidp_init(void) 1209 { 1210 int ret; 1211 1212 BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION); 1213 1214 ret = hid_register_driver(&hidp_driver); 1215 if (ret) 1216 goto err; 1217 1218 ret = hidp_init_sockets(); 1219 if (ret) 1220 goto err_drv; 1221 1222 return 0; 1223 err_drv: 1224 hid_unregister_driver(&hidp_driver); 1225 err: 1226 return ret; 1227 } 1228 1229 static void __exit hidp_exit(void) 1230 { 1231 hidp_cleanup_sockets(); 1232 hid_unregister_driver(&hidp_driver); 1233 } 1234 1235 module_init(hidp_init); 1236 module_exit(hidp_exit); 1237 1238 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 1239 MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION); 1240 MODULE_VERSION(VERSION); 1241 MODULE_LICENSE("GPL"); 1242 MODULE_ALIAS("bt-proto-6"); 1243