1 /* 2 HIDP implementation for Linux Bluetooth stack (BlueZ). 3 Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org> 4 Copyright (C) 2013 David Herrmann <dh.herrmann@gmail.com> 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License version 2 as 8 published by the Free Software Foundation; 9 10 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 11 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 12 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 13 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 14 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 15 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 21 SOFTWARE IS DISCLAIMED. 22 */ 23 24 #include <linux/kref.h> 25 #include <linux/module.h> 26 #include <linux/file.h> 27 #include <linux/kthread.h> 28 #include <linux/hidraw.h> 29 30 #include <net/bluetooth/bluetooth.h> 31 #include <net/bluetooth/hci_core.h> 32 #include <net/bluetooth/l2cap.h> 33 34 #include "hidp.h" 35 36 #define VERSION "1.2" 37 38 static DECLARE_RWSEM(hidp_session_sem); 39 static LIST_HEAD(hidp_session_list); 40 41 static unsigned char hidp_keycode[256] = { 42 0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 43 37, 38, 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 44 21, 44, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 28, 1, 45 14, 15, 57, 12, 13, 26, 27, 43, 43, 39, 40, 41, 51, 52, 46 53, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 87, 88, 47 99, 70, 119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103, 69, 48 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71, 72, 73, 49 82, 83, 86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189, 190, 50 191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135, 51 136, 113, 115, 114, 0, 0, 0, 121, 0, 89, 93, 124, 92, 94, 52 95, 0, 0, 0, 122, 123, 90, 91, 85, 0, 0, 0, 0, 0, 53 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 54 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 55 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 56 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 57 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 58 29, 42, 56, 125, 97, 54, 100, 126, 164, 166, 165, 163, 161, 115, 59 114, 113, 150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140 60 }; 61 62 static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 }; 63 64 static int hidp_session_probe(struct l2cap_conn *conn, 65 struct l2cap_user *user); 66 static void hidp_session_remove(struct l2cap_conn *conn, 67 struct l2cap_user *user); 68 static int hidp_session_thread(void *arg); 69 static void hidp_session_terminate(struct hidp_session *s); 70 71 static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci) 72 { 73 u32 valid_flags = 0; 74 memset(ci, 0, sizeof(*ci)); 75 bacpy(&ci->bdaddr, &session->bdaddr); 76 77 ci->flags = session->flags & valid_flags; 78 ci->state = BT_CONNECTED; 79 80 if (session->input) { 81 ci->vendor = session->input->id.vendor; 82 ci->product = session->input->id.product; 83 ci->version = session->input->id.version; 84 if (session->input->name) 85 strlcpy(ci->name, session->input->name, 128); 86 else 87 strlcpy(ci->name, "HID Boot Device", 128); 88 } else if (session->hid) { 89 ci->vendor = session->hid->vendor; 90 ci->product = session->hid->product; 91 ci->version = session->hid->version; 92 strlcpy(ci->name, session->hid->name, 128); 93 } 94 } 95 96 /* assemble skb, queue message on @transmit and wake up the session thread */ 97 static int hidp_send_message(struct hidp_session *session, struct socket *sock, 98 struct sk_buff_head *transmit, unsigned char hdr, 99 const unsigned char *data, int size) 100 { 101 struct sk_buff *skb; 102 struct sock *sk = sock->sk; 103 104 BT_DBG("session %p data %p size %d", session, data, size); 105 106 if (atomic_read(&session->terminate)) 107 return -EIO; 108 109 skb = alloc_skb(size + 1, GFP_ATOMIC); 110 if (!skb) { 111 BT_ERR("Can't allocate memory for new frame"); 112 return -ENOMEM; 113 } 114 115 *skb_put(skb, 1) = hdr; 116 if (data && size > 0) 117 memcpy(skb_put(skb, size), data, size); 118 119 skb_queue_tail(transmit, skb); 120 wake_up_interruptible(sk_sleep(sk)); 121 122 return 0; 123 } 124 125 static int hidp_send_ctrl_message(struct hidp_session *session, 126 unsigned char hdr, const unsigned char *data, 127 int size) 128 { 129 return hidp_send_message(session, session->ctrl_sock, 130 &session->ctrl_transmit, hdr, data, size); 131 } 132 133 static int hidp_send_intr_message(struct hidp_session *session, 134 unsigned char hdr, const unsigned char *data, 135 int size) 136 { 137 return hidp_send_message(session, session->intr_sock, 138 &session->intr_transmit, hdr, data, size); 139 } 140 141 static int hidp_input_event(struct input_dev *dev, unsigned int type, 142 unsigned int code, int value) 143 { 144 struct hidp_session *session = input_get_drvdata(dev); 145 unsigned char newleds; 146 unsigned char hdr, data[2]; 147 148 BT_DBG("session %p type %d code %d value %d", 149 session, type, code, value); 150 151 if (type != EV_LED) 152 return -1; 153 154 newleds = (!!test_bit(LED_KANA, dev->led) << 3) | 155 (!!test_bit(LED_COMPOSE, dev->led) << 3) | 156 (!!test_bit(LED_SCROLLL, dev->led) << 2) | 157 (!!test_bit(LED_CAPSL, dev->led) << 1) | 158 (!!test_bit(LED_NUML, dev->led) << 0); 159 160 if (session->leds == newleds) 161 return 0; 162 163 session->leds = newleds; 164 165 hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT; 166 data[0] = 0x01; 167 data[1] = newleds; 168 169 return hidp_send_intr_message(session, hdr, data, 2); 170 } 171 172 static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb) 173 { 174 struct input_dev *dev = session->input; 175 unsigned char *keys = session->keys; 176 unsigned char *udata = skb->data + 1; 177 signed char *sdata = skb->data + 1; 178 int i, size = skb->len - 1; 179 180 switch (skb->data[0]) { 181 case 0x01: /* Keyboard report */ 182 for (i = 0; i < 8; i++) 183 input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1); 184 185 /* If all the key codes have been set to 0x01, it means 186 * too many keys were pressed at the same time. */ 187 if (!memcmp(udata + 2, hidp_mkeyspat, 6)) 188 break; 189 190 for (i = 2; i < 8; i++) { 191 if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) { 192 if (hidp_keycode[keys[i]]) 193 input_report_key(dev, hidp_keycode[keys[i]], 0); 194 else 195 BT_ERR("Unknown key (scancode %#x) released.", keys[i]); 196 } 197 198 if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) { 199 if (hidp_keycode[udata[i]]) 200 input_report_key(dev, hidp_keycode[udata[i]], 1); 201 else 202 BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]); 203 } 204 } 205 206 memcpy(keys, udata, 8); 207 break; 208 209 case 0x02: /* Mouse report */ 210 input_report_key(dev, BTN_LEFT, sdata[0] & 0x01); 211 input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02); 212 input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04); 213 input_report_key(dev, BTN_SIDE, sdata[0] & 0x08); 214 input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10); 215 216 input_report_rel(dev, REL_X, sdata[1]); 217 input_report_rel(dev, REL_Y, sdata[2]); 218 219 if (size > 3) 220 input_report_rel(dev, REL_WHEEL, sdata[3]); 221 break; 222 } 223 224 input_sync(dev); 225 } 226 227 static int hidp_get_raw_report(struct hid_device *hid, 228 unsigned char report_number, 229 unsigned char *data, size_t count, 230 unsigned char report_type) 231 { 232 struct hidp_session *session = hid->driver_data; 233 struct sk_buff *skb; 234 size_t len; 235 int numbered_reports = hid->report_enum[report_type].numbered; 236 int ret; 237 238 if (atomic_read(&session->terminate)) 239 return -EIO; 240 241 switch (report_type) { 242 case HID_FEATURE_REPORT: 243 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE; 244 break; 245 case HID_INPUT_REPORT: 246 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT; 247 break; 248 case HID_OUTPUT_REPORT: 249 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT; 250 break; 251 default: 252 return -EINVAL; 253 } 254 255 if (mutex_lock_interruptible(&session->report_mutex)) 256 return -ERESTARTSYS; 257 258 /* Set up our wait, and send the report request to the device. */ 259 session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK; 260 session->waiting_report_number = numbered_reports ? report_number : -1; 261 set_bit(HIDP_WAITING_FOR_RETURN, &session->flags); 262 data[0] = report_number; 263 ret = hidp_send_ctrl_message(session, report_type, data, 1); 264 if (ret) 265 goto err; 266 267 /* Wait for the return of the report. The returned report 268 gets put in session->report_return. */ 269 while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) && 270 !atomic_read(&session->terminate)) { 271 int res; 272 273 res = wait_event_interruptible_timeout(session->report_queue, 274 !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) 275 || atomic_read(&session->terminate), 276 5*HZ); 277 if (res == 0) { 278 /* timeout */ 279 ret = -EIO; 280 goto err; 281 } 282 if (res < 0) { 283 /* signal */ 284 ret = -ERESTARTSYS; 285 goto err; 286 } 287 } 288 289 skb = session->report_return; 290 if (skb) { 291 len = skb->len < count ? skb->len : count; 292 memcpy(data, skb->data, len); 293 294 kfree_skb(skb); 295 session->report_return = NULL; 296 } else { 297 /* Device returned a HANDSHAKE, indicating protocol error. */ 298 len = -EIO; 299 } 300 301 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); 302 mutex_unlock(&session->report_mutex); 303 304 return len; 305 306 err: 307 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); 308 mutex_unlock(&session->report_mutex); 309 return ret; 310 } 311 312 static int hidp_set_raw_report(struct hid_device *hid, unsigned char reportnum, 313 unsigned char *data, size_t count, 314 unsigned char report_type) 315 { 316 struct hidp_session *session = hid->driver_data; 317 int ret; 318 319 switch (report_type) { 320 case HID_FEATURE_REPORT: 321 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE; 322 break; 323 case HID_INPUT_REPORT: 324 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_INPUT; 325 break; 326 case HID_OUTPUT_REPORT: 327 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT; 328 break; 329 default: 330 return -EINVAL; 331 } 332 333 if (mutex_lock_interruptible(&session->report_mutex)) 334 return -ERESTARTSYS; 335 336 /* Set up our wait, and send the report request to the device. */ 337 data[0] = reportnum; 338 set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags); 339 ret = hidp_send_ctrl_message(session, report_type, data, count); 340 if (ret) 341 goto err; 342 343 /* Wait for the ACK from the device. */ 344 while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) && 345 !atomic_read(&session->terminate)) { 346 int res; 347 348 res = wait_event_interruptible_timeout(session->report_queue, 349 !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) 350 || atomic_read(&session->terminate), 351 10*HZ); 352 if (res == 0) { 353 /* timeout */ 354 ret = -EIO; 355 goto err; 356 } 357 if (res < 0) { 358 /* signal */ 359 ret = -ERESTARTSYS; 360 goto err; 361 } 362 } 363 364 if (!session->output_report_success) { 365 ret = -EIO; 366 goto err; 367 } 368 369 ret = count; 370 371 err: 372 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags); 373 mutex_unlock(&session->report_mutex); 374 return ret; 375 } 376 377 static int hidp_output_report(struct hid_device *hid, __u8 *data, size_t count) 378 { 379 struct hidp_session *session = hid->driver_data; 380 381 return hidp_send_intr_message(session, 382 HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT, 383 data, count); 384 } 385 386 static int hidp_raw_request(struct hid_device *hid, unsigned char reportnum, 387 __u8 *buf, size_t len, unsigned char rtype, 388 int reqtype) 389 { 390 switch (reqtype) { 391 case HID_REQ_GET_REPORT: 392 return hidp_get_raw_report(hid, reportnum, buf, len, rtype); 393 case HID_REQ_SET_REPORT: 394 return hidp_set_raw_report(hid, reportnum, buf, len, rtype); 395 default: 396 return -EIO; 397 } 398 } 399 400 static void hidp_idle_timeout(unsigned long arg) 401 { 402 struct hidp_session *session = (struct hidp_session *) arg; 403 404 hidp_session_terminate(session); 405 } 406 407 static void hidp_set_timer(struct hidp_session *session) 408 { 409 if (session->idle_to > 0) 410 mod_timer(&session->timer, jiffies + HZ * session->idle_to); 411 } 412 413 static void hidp_del_timer(struct hidp_session *session) 414 { 415 if (session->idle_to > 0) 416 del_timer(&session->timer); 417 } 418 419 static void hidp_process_report(struct hidp_session *session, 420 int type, const u8 *data, int len, int intr) 421 { 422 if (len > HID_MAX_BUFFER_SIZE) 423 len = HID_MAX_BUFFER_SIZE; 424 425 memcpy(session->input_buf, data, len); 426 hid_input_report(session->hid, type, session->input_buf, len, intr); 427 } 428 429 static void hidp_process_handshake(struct hidp_session *session, 430 unsigned char param) 431 { 432 BT_DBG("session %p param 0x%02x", session, param); 433 session->output_report_success = 0; /* default condition */ 434 435 switch (param) { 436 case HIDP_HSHK_SUCCESSFUL: 437 /* FIXME: Call into SET_ GET_ handlers here */ 438 session->output_report_success = 1; 439 break; 440 441 case HIDP_HSHK_NOT_READY: 442 case HIDP_HSHK_ERR_INVALID_REPORT_ID: 443 case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST: 444 case HIDP_HSHK_ERR_INVALID_PARAMETER: 445 if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags)) 446 wake_up_interruptible(&session->report_queue); 447 448 /* FIXME: Call into SET_ GET_ handlers here */ 449 break; 450 451 case HIDP_HSHK_ERR_UNKNOWN: 452 break; 453 454 case HIDP_HSHK_ERR_FATAL: 455 /* Device requests a reboot, as this is the only way this error 456 * can be recovered. */ 457 hidp_send_ctrl_message(session, 458 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0); 459 break; 460 461 default: 462 hidp_send_ctrl_message(session, 463 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); 464 break; 465 } 466 467 /* Wake up the waiting thread. */ 468 if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) 469 wake_up_interruptible(&session->report_queue); 470 } 471 472 static void hidp_process_hid_control(struct hidp_session *session, 473 unsigned char param) 474 { 475 BT_DBG("session %p param 0x%02x", session, param); 476 477 if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) { 478 /* Flush the transmit queues */ 479 skb_queue_purge(&session->ctrl_transmit); 480 skb_queue_purge(&session->intr_transmit); 481 482 hidp_session_terminate(session); 483 } 484 } 485 486 /* Returns true if the passed-in skb should be freed by the caller. */ 487 static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb, 488 unsigned char param) 489 { 490 int done_with_skb = 1; 491 BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param); 492 493 switch (param) { 494 case HIDP_DATA_RTYPE_INPUT: 495 hidp_set_timer(session); 496 497 if (session->input) 498 hidp_input_report(session, skb); 499 500 if (session->hid) 501 hidp_process_report(session, HID_INPUT_REPORT, 502 skb->data, skb->len, 0); 503 break; 504 505 case HIDP_DATA_RTYPE_OTHER: 506 case HIDP_DATA_RTYPE_OUPUT: 507 case HIDP_DATA_RTYPE_FEATURE: 508 break; 509 510 default: 511 hidp_send_ctrl_message(session, 512 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); 513 } 514 515 if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) && 516 param == session->waiting_report_type) { 517 if (session->waiting_report_number < 0 || 518 session->waiting_report_number == skb->data[0]) { 519 /* hidp_get_raw_report() is waiting on this report. */ 520 session->report_return = skb; 521 done_with_skb = 0; 522 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); 523 wake_up_interruptible(&session->report_queue); 524 } 525 } 526 527 return done_with_skb; 528 } 529 530 static void hidp_recv_ctrl_frame(struct hidp_session *session, 531 struct sk_buff *skb) 532 { 533 unsigned char hdr, type, param; 534 int free_skb = 1; 535 536 BT_DBG("session %p skb %p len %d", session, skb, skb->len); 537 538 hdr = skb->data[0]; 539 skb_pull(skb, 1); 540 541 type = hdr & HIDP_HEADER_TRANS_MASK; 542 param = hdr & HIDP_HEADER_PARAM_MASK; 543 544 switch (type) { 545 case HIDP_TRANS_HANDSHAKE: 546 hidp_process_handshake(session, param); 547 break; 548 549 case HIDP_TRANS_HID_CONTROL: 550 hidp_process_hid_control(session, param); 551 break; 552 553 case HIDP_TRANS_DATA: 554 free_skb = hidp_process_data(session, skb, param); 555 break; 556 557 default: 558 hidp_send_ctrl_message(session, 559 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0); 560 break; 561 } 562 563 if (free_skb) 564 kfree_skb(skb); 565 } 566 567 static void hidp_recv_intr_frame(struct hidp_session *session, 568 struct sk_buff *skb) 569 { 570 unsigned char hdr; 571 572 BT_DBG("session %p skb %p len %d", session, skb, skb->len); 573 574 hdr = skb->data[0]; 575 skb_pull(skb, 1); 576 577 if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) { 578 hidp_set_timer(session); 579 580 if (session->input) 581 hidp_input_report(session, skb); 582 583 if (session->hid) { 584 hidp_process_report(session, HID_INPUT_REPORT, 585 skb->data, skb->len, 1); 586 BT_DBG("report len %d", skb->len); 587 } 588 } else { 589 BT_DBG("Unsupported protocol header 0x%02x", hdr); 590 } 591 592 kfree_skb(skb); 593 } 594 595 static int hidp_send_frame(struct socket *sock, unsigned char *data, int len) 596 { 597 struct kvec iv = { data, len }; 598 struct msghdr msg; 599 600 BT_DBG("sock %p data %p len %d", sock, data, len); 601 602 if (!len) 603 return 0; 604 605 memset(&msg, 0, sizeof(msg)); 606 607 return kernel_sendmsg(sock, &msg, &iv, 1, len); 608 } 609 610 /* dequeue message from @transmit and send via @sock */ 611 static void hidp_process_transmit(struct hidp_session *session, 612 struct sk_buff_head *transmit, 613 struct socket *sock) 614 { 615 struct sk_buff *skb; 616 int ret; 617 618 BT_DBG("session %p", session); 619 620 while ((skb = skb_dequeue(transmit))) { 621 ret = hidp_send_frame(sock, skb->data, skb->len); 622 if (ret == -EAGAIN) { 623 skb_queue_head(transmit, skb); 624 break; 625 } else if (ret < 0) { 626 hidp_session_terminate(session); 627 kfree_skb(skb); 628 break; 629 } 630 631 hidp_set_timer(session); 632 kfree_skb(skb); 633 } 634 } 635 636 static int hidp_setup_input(struct hidp_session *session, 637 struct hidp_connadd_req *req) 638 { 639 struct input_dev *input; 640 int i; 641 642 input = input_allocate_device(); 643 if (!input) 644 return -ENOMEM; 645 646 session->input = input; 647 648 input_set_drvdata(input, session); 649 650 input->name = "Bluetooth HID Boot Protocol Device"; 651 652 input->id.bustype = BUS_BLUETOOTH; 653 input->id.vendor = req->vendor; 654 input->id.product = req->product; 655 input->id.version = req->version; 656 657 if (req->subclass & 0x40) { 658 set_bit(EV_KEY, input->evbit); 659 set_bit(EV_LED, input->evbit); 660 set_bit(EV_REP, input->evbit); 661 662 set_bit(LED_NUML, input->ledbit); 663 set_bit(LED_CAPSL, input->ledbit); 664 set_bit(LED_SCROLLL, input->ledbit); 665 set_bit(LED_COMPOSE, input->ledbit); 666 set_bit(LED_KANA, input->ledbit); 667 668 for (i = 0; i < sizeof(hidp_keycode); i++) 669 set_bit(hidp_keycode[i], input->keybit); 670 clear_bit(0, input->keybit); 671 } 672 673 if (req->subclass & 0x80) { 674 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); 675 input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) | 676 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE); 677 input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); 678 input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) | 679 BIT_MASK(BTN_EXTRA); 680 input->relbit[0] |= BIT_MASK(REL_WHEEL); 681 } 682 683 input->dev.parent = &session->conn->hcon->dev; 684 685 input->event = hidp_input_event; 686 687 return 0; 688 } 689 690 static int hidp_open(struct hid_device *hid) 691 { 692 return 0; 693 } 694 695 static void hidp_close(struct hid_device *hid) 696 { 697 } 698 699 static int hidp_parse(struct hid_device *hid) 700 { 701 struct hidp_session *session = hid->driver_data; 702 703 return hid_parse_report(session->hid, session->rd_data, 704 session->rd_size); 705 } 706 707 static int hidp_start(struct hid_device *hid) 708 { 709 return 0; 710 } 711 712 static void hidp_stop(struct hid_device *hid) 713 { 714 struct hidp_session *session = hid->driver_data; 715 716 skb_queue_purge(&session->ctrl_transmit); 717 skb_queue_purge(&session->intr_transmit); 718 719 hid->claimed = 0; 720 } 721 722 static struct hid_ll_driver hidp_hid_driver = { 723 .parse = hidp_parse, 724 .start = hidp_start, 725 .stop = hidp_stop, 726 .open = hidp_open, 727 .close = hidp_close, 728 .raw_request = hidp_raw_request, 729 .output_report = hidp_output_report, 730 }; 731 732 /* This function sets up the hid device. It does not add it 733 to the HID system. That is done in hidp_add_connection(). */ 734 static int hidp_setup_hid(struct hidp_session *session, 735 struct hidp_connadd_req *req) 736 { 737 struct hid_device *hid; 738 int err; 739 740 session->rd_data = memdup_user(req->rd_data, req->rd_size); 741 if (IS_ERR(session->rd_data)) 742 return PTR_ERR(session->rd_data); 743 744 session->rd_size = req->rd_size; 745 746 hid = hid_allocate_device(); 747 if (IS_ERR(hid)) { 748 err = PTR_ERR(hid); 749 goto fault; 750 } 751 752 session->hid = hid; 753 754 hid->driver_data = session; 755 756 hid->bus = BUS_BLUETOOTH; 757 hid->vendor = req->vendor; 758 hid->product = req->product; 759 hid->version = req->version; 760 hid->country = req->country; 761 762 strncpy(hid->name, req->name, sizeof(req->name) - 1); 763 764 snprintf(hid->phys, sizeof(hid->phys), "%pMR", 765 &l2cap_pi(session->ctrl_sock->sk)->chan->src); 766 767 /* NOTE: Some device modules depend on the dst address being stored in 768 * uniq. Please be aware of this before making changes to this behavior. 769 */ 770 snprintf(hid->uniq, sizeof(hid->uniq), "%pMR", 771 &l2cap_pi(session->ctrl_sock->sk)->chan->dst); 772 773 hid->dev.parent = &session->conn->hcon->dev; 774 hid->ll_driver = &hidp_hid_driver; 775 776 /* True if device is blacklisted in drivers/hid/hid-core.c */ 777 if (hid_ignore(hid)) { 778 hid_destroy_device(session->hid); 779 session->hid = NULL; 780 return -ENODEV; 781 } 782 783 return 0; 784 785 fault: 786 kfree(session->rd_data); 787 session->rd_data = NULL; 788 789 return err; 790 } 791 792 /* initialize session devices */ 793 static int hidp_session_dev_init(struct hidp_session *session, 794 struct hidp_connadd_req *req) 795 { 796 int ret; 797 798 if (req->rd_size > 0) { 799 ret = hidp_setup_hid(session, req); 800 if (ret && ret != -ENODEV) 801 return ret; 802 } 803 804 if (!session->hid) { 805 ret = hidp_setup_input(session, req); 806 if (ret < 0) 807 return ret; 808 } 809 810 return 0; 811 } 812 813 /* destroy session devices */ 814 static void hidp_session_dev_destroy(struct hidp_session *session) 815 { 816 if (session->hid) 817 put_device(&session->hid->dev); 818 else if (session->input) 819 input_put_device(session->input); 820 821 kfree(session->rd_data); 822 session->rd_data = NULL; 823 } 824 825 /* add HID/input devices to their underlying bus systems */ 826 static int hidp_session_dev_add(struct hidp_session *session) 827 { 828 int ret; 829 830 /* Both HID and input systems drop a ref-count when unregistering the 831 * device but they don't take a ref-count when registering them. Work 832 * around this by explicitly taking a refcount during registration 833 * which is dropped automatically by unregistering the devices. */ 834 835 if (session->hid) { 836 ret = hid_add_device(session->hid); 837 if (ret) 838 return ret; 839 get_device(&session->hid->dev); 840 } else if (session->input) { 841 ret = input_register_device(session->input); 842 if (ret) 843 return ret; 844 input_get_device(session->input); 845 } 846 847 return 0; 848 } 849 850 /* remove HID/input devices from their bus systems */ 851 static void hidp_session_dev_del(struct hidp_session *session) 852 { 853 if (session->hid) 854 hid_destroy_device(session->hid); 855 else if (session->input) 856 input_unregister_device(session->input); 857 } 858 859 /* 860 * Asynchronous device registration 861 * HID device drivers might want to perform I/O during initialization to 862 * detect device types. Therefore, call device registration in a separate 863 * worker so the HIDP thread can schedule I/O operations. 864 * Note that this must be called after the worker thread was initialized 865 * successfully. This will then add the devices and increase session state 866 * on success, otherwise it will terminate the session thread. 867 */ 868 static void hidp_session_dev_work(struct work_struct *work) 869 { 870 struct hidp_session *session = container_of(work, 871 struct hidp_session, 872 dev_init); 873 int ret; 874 875 ret = hidp_session_dev_add(session); 876 if (!ret) 877 atomic_inc(&session->state); 878 else 879 hidp_session_terminate(session); 880 } 881 882 /* 883 * Create new session object 884 * Allocate session object, initialize static fields, copy input data into the 885 * object and take a reference to all sub-objects. 886 * This returns 0 on success and puts a pointer to the new session object in 887 * \out. Otherwise, an error code is returned. 888 * The new session object has an initial ref-count of 1. 889 */ 890 static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr, 891 struct socket *ctrl_sock, 892 struct socket *intr_sock, 893 struct hidp_connadd_req *req, 894 struct l2cap_conn *conn) 895 { 896 struct hidp_session *session; 897 int ret; 898 struct bt_sock *ctrl, *intr; 899 900 ctrl = bt_sk(ctrl_sock->sk); 901 intr = bt_sk(intr_sock->sk); 902 903 session = kzalloc(sizeof(*session), GFP_KERNEL); 904 if (!session) 905 return -ENOMEM; 906 907 /* object and runtime management */ 908 kref_init(&session->ref); 909 atomic_set(&session->state, HIDP_SESSION_IDLING); 910 init_waitqueue_head(&session->state_queue); 911 session->flags = req->flags & BIT(HIDP_BLUETOOTH_VENDOR_ID); 912 913 /* connection management */ 914 bacpy(&session->bdaddr, bdaddr); 915 session->conn = l2cap_conn_get(conn); 916 session->user.probe = hidp_session_probe; 917 session->user.remove = hidp_session_remove; 918 session->ctrl_sock = ctrl_sock; 919 session->intr_sock = intr_sock; 920 skb_queue_head_init(&session->ctrl_transmit); 921 skb_queue_head_init(&session->intr_transmit); 922 session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu, 923 l2cap_pi(ctrl)->chan->imtu); 924 session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu, 925 l2cap_pi(intr)->chan->imtu); 926 session->idle_to = req->idle_to; 927 928 /* device management */ 929 INIT_WORK(&session->dev_init, hidp_session_dev_work); 930 setup_timer(&session->timer, hidp_idle_timeout, 931 (unsigned long)session); 932 933 /* session data */ 934 mutex_init(&session->report_mutex); 935 init_waitqueue_head(&session->report_queue); 936 937 ret = hidp_session_dev_init(session, req); 938 if (ret) 939 goto err_free; 940 941 get_file(session->intr_sock->file); 942 get_file(session->ctrl_sock->file); 943 *out = session; 944 return 0; 945 946 err_free: 947 l2cap_conn_put(session->conn); 948 kfree(session); 949 return ret; 950 } 951 952 /* increase ref-count of the given session by one */ 953 static void hidp_session_get(struct hidp_session *session) 954 { 955 kref_get(&session->ref); 956 } 957 958 /* release callback */ 959 static void session_free(struct kref *ref) 960 { 961 struct hidp_session *session = container_of(ref, struct hidp_session, 962 ref); 963 964 hidp_session_dev_destroy(session); 965 skb_queue_purge(&session->ctrl_transmit); 966 skb_queue_purge(&session->intr_transmit); 967 fput(session->intr_sock->file); 968 fput(session->ctrl_sock->file); 969 l2cap_conn_put(session->conn); 970 kfree(session); 971 } 972 973 /* decrease ref-count of the given session by one */ 974 static void hidp_session_put(struct hidp_session *session) 975 { 976 kref_put(&session->ref, session_free); 977 } 978 979 /* 980 * Search the list of active sessions for a session with target address 981 * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as 982 * you do not release this lock, the session objects cannot vanish and you can 983 * safely take a reference to the session yourself. 984 */ 985 static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr) 986 { 987 struct hidp_session *session; 988 989 list_for_each_entry(session, &hidp_session_list, list) { 990 if (!bacmp(bdaddr, &session->bdaddr)) 991 return session; 992 } 993 994 return NULL; 995 } 996 997 /* 998 * Same as __hidp_session_find() but no locks must be held. This also takes a 999 * reference of the returned session (if non-NULL) so you must drop this 1000 * reference if you no longer use the object. 1001 */ 1002 static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr) 1003 { 1004 struct hidp_session *session; 1005 1006 down_read(&hidp_session_sem); 1007 1008 session = __hidp_session_find(bdaddr); 1009 if (session) 1010 hidp_session_get(session); 1011 1012 up_read(&hidp_session_sem); 1013 1014 return session; 1015 } 1016 1017 /* 1018 * Start session synchronously 1019 * This starts a session thread and waits until initialization 1020 * is done or returns an error if it couldn't be started. 1021 * If this returns 0 the session thread is up and running. You must call 1022 * hipd_session_stop_sync() before deleting any runtime resources. 1023 */ 1024 static int hidp_session_start_sync(struct hidp_session *session) 1025 { 1026 unsigned int vendor, product; 1027 1028 if (session->hid) { 1029 vendor = session->hid->vendor; 1030 product = session->hid->product; 1031 } else if (session->input) { 1032 vendor = session->input->id.vendor; 1033 product = session->input->id.product; 1034 } else { 1035 vendor = 0x0000; 1036 product = 0x0000; 1037 } 1038 1039 session->task = kthread_run(hidp_session_thread, session, 1040 "khidpd_%04x%04x", vendor, product); 1041 if (IS_ERR(session->task)) 1042 return PTR_ERR(session->task); 1043 1044 while (atomic_read(&session->state) <= HIDP_SESSION_IDLING) 1045 wait_event(session->state_queue, 1046 atomic_read(&session->state) > HIDP_SESSION_IDLING); 1047 1048 return 0; 1049 } 1050 1051 /* 1052 * Terminate session thread 1053 * Wake up session thread and notify it to stop. This is asynchronous and 1054 * returns immediately. Call this whenever a runtime error occurs and you want 1055 * the session to stop. 1056 * Note: wake_up_process() performs any necessary memory-barriers for us. 1057 */ 1058 static void hidp_session_terminate(struct hidp_session *session) 1059 { 1060 atomic_inc(&session->terminate); 1061 wake_up_process(session->task); 1062 } 1063 1064 /* 1065 * Probe HIDP session 1066 * This is called from the l2cap_conn core when our l2cap_user object is bound 1067 * to the hci-connection. We get the session via the \user object and can now 1068 * start the session thread, link it into the global session list and 1069 * schedule HID/input device registration. 1070 * The global session-list owns its own reference to the session object so you 1071 * can drop your own reference after registering the l2cap_user object. 1072 */ 1073 static int hidp_session_probe(struct l2cap_conn *conn, 1074 struct l2cap_user *user) 1075 { 1076 struct hidp_session *session = container_of(user, 1077 struct hidp_session, 1078 user); 1079 struct hidp_session *s; 1080 int ret; 1081 1082 down_write(&hidp_session_sem); 1083 1084 /* check that no other session for this device exists */ 1085 s = __hidp_session_find(&session->bdaddr); 1086 if (s) { 1087 ret = -EEXIST; 1088 goto out_unlock; 1089 } 1090 1091 if (session->input) { 1092 ret = hidp_session_dev_add(session); 1093 if (ret) 1094 goto out_unlock; 1095 } 1096 1097 ret = hidp_session_start_sync(session); 1098 if (ret) 1099 goto out_del; 1100 1101 /* HID device registration is async to allow I/O during probe */ 1102 if (session->input) 1103 atomic_inc(&session->state); 1104 else 1105 schedule_work(&session->dev_init); 1106 1107 hidp_session_get(session); 1108 list_add(&session->list, &hidp_session_list); 1109 ret = 0; 1110 goto out_unlock; 1111 1112 out_del: 1113 if (session->input) 1114 hidp_session_dev_del(session); 1115 out_unlock: 1116 up_write(&hidp_session_sem); 1117 return ret; 1118 } 1119 1120 /* 1121 * Remove HIDP session 1122 * Called from the l2cap_conn core when either we explicitly unregistered 1123 * the l2cap_user object or if the underlying connection is shut down. 1124 * We signal the hidp-session thread to shut down, unregister the HID/input 1125 * devices and unlink the session from the global list. 1126 * This drops the reference to the session that is owned by the global 1127 * session-list. 1128 * Note: We _must_ not synchronosly wait for the session-thread to shut down. 1129 * This is, because the session-thread might be waiting for an HCI lock that is 1130 * held while we are called. Therefore, we only unregister the devices and 1131 * notify the session-thread to terminate. The thread itself owns a reference 1132 * to the session object so it can safely shut down. 1133 */ 1134 static void hidp_session_remove(struct l2cap_conn *conn, 1135 struct l2cap_user *user) 1136 { 1137 struct hidp_session *session = container_of(user, 1138 struct hidp_session, 1139 user); 1140 1141 down_write(&hidp_session_sem); 1142 1143 hidp_session_terminate(session); 1144 1145 cancel_work_sync(&session->dev_init); 1146 if (session->input || 1147 atomic_read(&session->state) > HIDP_SESSION_PREPARING) 1148 hidp_session_dev_del(session); 1149 1150 list_del(&session->list); 1151 1152 up_write(&hidp_session_sem); 1153 1154 hidp_session_put(session); 1155 } 1156 1157 /* 1158 * Session Worker 1159 * This performs the actual main-loop of the HIDP worker. We first check 1160 * whether the underlying connection is still alive, then parse all pending 1161 * messages and finally send all outstanding messages. 1162 */ 1163 static void hidp_session_run(struct hidp_session *session) 1164 { 1165 struct sock *ctrl_sk = session->ctrl_sock->sk; 1166 struct sock *intr_sk = session->intr_sock->sk; 1167 struct sk_buff *skb; 1168 1169 for (;;) { 1170 /* 1171 * This thread can be woken up two ways: 1172 * - You call hidp_session_terminate() which sets the 1173 * session->terminate flag and wakes this thread up. 1174 * - Via modifying the socket state of ctrl/intr_sock. This 1175 * thread is woken up by ->sk_state_changed(). 1176 * 1177 * Note: set_current_state() performs any necessary 1178 * memory-barriers for us. 1179 */ 1180 set_current_state(TASK_INTERRUPTIBLE); 1181 1182 if (atomic_read(&session->terminate)) 1183 break; 1184 1185 if (ctrl_sk->sk_state != BT_CONNECTED || 1186 intr_sk->sk_state != BT_CONNECTED) 1187 break; 1188 1189 /* parse incoming intr-skbs */ 1190 while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) { 1191 skb_orphan(skb); 1192 if (!skb_linearize(skb)) 1193 hidp_recv_intr_frame(session, skb); 1194 else 1195 kfree_skb(skb); 1196 } 1197 1198 /* send pending intr-skbs */ 1199 hidp_process_transmit(session, &session->intr_transmit, 1200 session->intr_sock); 1201 1202 /* parse incoming ctrl-skbs */ 1203 while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) { 1204 skb_orphan(skb); 1205 if (!skb_linearize(skb)) 1206 hidp_recv_ctrl_frame(session, skb); 1207 else 1208 kfree_skb(skb); 1209 } 1210 1211 /* send pending ctrl-skbs */ 1212 hidp_process_transmit(session, &session->ctrl_transmit, 1213 session->ctrl_sock); 1214 1215 schedule(); 1216 } 1217 1218 atomic_inc(&session->terminate); 1219 set_current_state(TASK_RUNNING); 1220 } 1221 1222 /* 1223 * HIDP session thread 1224 * This thread runs the I/O for a single HIDP session. Startup is synchronous 1225 * which allows us to take references to ourself here instead of doing that in 1226 * the caller. 1227 * When we are ready to run we notify the caller and call hidp_session_run(). 1228 */ 1229 static int hidp_session_thread(void *arg) 1230 { 1231 struct hidp_session *session = arg; 1232 wait_queue_t ctrl_wait, intr_wait; 1233 1234 BT_DBG("session %p", session); 1235 1236 /* initialize runtime environment */ 1237 hidp_session_get(session); 1238 __module_get(THIS_MODULE); 1239 set_user_nice(current, -15); 1240 hidp_set_timer(session); 1241 1242 init_waitqueue_entry(&ctrl_wait, current); 1243 init_waitqueue_entry(&intr_wait, current); 1244 add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait); 1245 add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait); 1246 /* This memory barrier is paired with wq_has_sleeper(). See 1247 * sock_poll_wait() for more information why this is needed. */ 1248 smp_mb(); 1249 1250 /* notify synchronous startup that we're ready */ 1251 atomic_inc(&session->state); 1252 wake_up(&session->state_queue); 1253 1254 /* run session */ 1255 hidp_session_run(session); 1256 1257 /* cleanup runtime environment */ 1258 remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait); 1259 remove_wait_queue(sk_sleep(session->intr_sock->sk), &ctrl_wait); 1260 wake_up_interruptible(&session->report_queue); 1261 hidp_del_timer(session); 1262 1263 /* 1264 * If we stopped ourself due to any internal signal, we should try to 1265 * unregister our own session here to avoid having it linger until the 1266 * parent l2cap_conn dies or user-space cleans it up. 1267 * This does not deadlock as we don't do any synchronous shutdown. 1268 * Instead, this call has the same semantics as if user-space tried to 1269 * delete the session. 1270 */ 1271 l2cap_unregister_user(session->conn, &session->user); 1272 hidp_session_put(session); 1273 1274 module_put_and_exit(0); 1275 return 0; 1276 } 1277 1278 static int hidp_verify_sockets(struct socket *ctrl_sock, 1279 struct socket *intr_sock) 1280 { 1281 struct l2cap_chan *ctrl_chan, *intr_chan; 1282 struct bt_sock *ctrl, *intr; 1283 struct hidp_session *session; 1284 1285 if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock)) 1286 return -EINVAL; 1287 1288 ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan; 1289 intr_chan = l2cap_pi(intr_sock->sk)->chan; 1290 1291 if (bacmp(&ctrl_chan->src, &intr_chan->src) || 1292 bacmp(&ctrl_chan->dst, &intr_chan->dst)) 1293 return -ENOTUNIQ; 1294 1295 ctrl = bt_sk(ctrl_sock->sk); 1296 intr = bt_sk(intr_sock->sk); 1297 1298 if (ctrl->sk.sk_state != BT_CONNECTED || 1299 intr->sk.sk_state != BT_CONNECTED) 1300 return -EBADFD; 1301 1302 /* early session check, we check again during session registration */ 1303 session = hidp_session_find(&ctrl_chan->dst); 1304 if (session) { 1305 hidp_session_put(session); 1306 return -EEXIST; 1307 } 1308 1309 return 0; 1310 } 1311 1312 int hidp_connection_add(struct hidp_connadd_req *req, 1313 struct socket *ctrl_sock, 1314 struct socket *intr_sock) 1315 { 1316 u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG) | 1317 BIT(HIDP_BOOT_PROTOCOL_MODE); 1318 struct hidp_session *session; 1319 struct l2cap_conn *conn; 1320 struct l2cap_chan *chan; 1321 int ret; 1322 1323 ret = hidp_verify_sockets(ctrl_sock, intr_sock); 1324 if (ret) 1325 return ret; 1326 1327 if (req->flags & ~valid_flags) 1328 return -EINVAL; 1329 1330 chan = l2cap_pi(ctrl_sock->sk)->chan; 1331 conn = NULL; 1332 l2cap_chan_lock(chan); 1333 if (chan->conn) 1334 conn = l2cap_conn_get(chan->conn); 1335 l2cap_chan_unlock(chan); 1336 1337 if (!conn) 1338 return -EBADFD; 1339 1340 ret = hidp_session_new(&session, &chan->dst, ctrl_sock, 1341 intr_sock, req, conn); 1342 if (ret) 1343 goto out_conn; 1344 1345 ret = l2cap_register_user(conn, &session->user); 1346 if (ret) 1347 goto out_session; 1348 1349 ret = 0; 1350 1351 out_session: 1352 hidp_session_put(session); 1353 out_conn: 1354 l2cap_conn_put(conn); 1355 return ret; 1356 } 1357 1358 int hidp_connection_del(struct hidp_conndel_req *req) 1359 { 1360 u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG); 1361 struct hidp_session *session; 1362 1363 if (req->flags & ~valid_flags) 1364 return -EINVAL; 1365 1366 session = hidp_session_find(&req->bdaddr); 1367 if (!session) 1368 return -ENOENT; 1369 1370 if (req->flags & BIT(HIDP_VIRTUAL_CABLE_UNPLUG)) 1371 hidp_send_ctrl_message(session, 1372 HIDP_TRANS_HID_CONTROL | 1373 HIDP_CTRL_VIRTUAL_CABLE_UNPLUG, 1374 NULL, 0); 1375 else 1376 l2cap_unregister_user(session->conn, &session->user); 1377 1378 hidp_session_put(session); 1379 1380 return 0; 1381 } 1382 1383 int hidp_get_connlist(struct hidp_connlist_req *req) 1384 { 1385 struct hidp_session *session; 1386 int err = 0, n = 0; 1387 1388 BT_DBG(""); 1389 1390 down_read(&hidp_session_sem); 1391 1392 list_for_each_entry(session, &hidp_session_list, list) { 1393 struct hidp_conninfo ci; 1394 1395 hidp_copy_session(session, &ci); 1396 1397 if (copy_to_user(req->ci, &ci, sizeof(ci))) { 1398 err = -EFAULT; 1399 break; 1400 } 1401 1402 if (++n >= req->cnum) 1403 break; 1404 1405 req->ci++; 1406 } 1407 req->cnum = n; 1408 1409 up_read(&hidp_session_sem); 1410 return err; 1411 } 1412 1413 int hidp_get_conninfo(struct hidp_conninfo *ci) 1414 { 1415 struct hidp_session *session; 1416 1417 session = hidp_session_find(&ci->bdaddr); 1418 if (session) { 1419 hidp_copy_session(session, ci); 1420 hidp_session_put(session); 1421 } 1422 1423 return session ? 0 : -ENOENT; 1424 } 1425 1426 static int __init hidp_init(void) 1427 { 1428 BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION); 1429 1430 return hidp_init_sockets(); 1431 } 1432 1433 static void __exit hidp_exit(void) 1434 { 1435 hidp_cleanup_sockets(); 1436 } 1437 1438 module_init(hidp_init); 1439 module_exit(hidp_exit); 1440 1441 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 1442 MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>"); 1443 MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION); 1444 MODULE_VERSION(VERSION); 1445 MODULE_LICENSE("GPL"); 1446 MODULE_ALIAS("bt-proto-6"); 1447