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 38static DECLARE_RWSEM(hidp_session_sem); 39static LIST_HEAD(hidp_session_list); 40 41static 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 62static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 }; 63 64static int hidp_session_probe(struct l2cap_conn *conn, 65 struct l2cap_user *user); 66static void hidp_session_remove(struct l2cap_conn *conn, 67 struct l2cap_user *user); 68static int hidp_session_thread(void *arg); 69static void hidp_session_terminate(struct hidp_session *s); 70 71static 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 */ 97static 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 125static 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 133static 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 141static 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 172static 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 227static 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 306err: 307 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); 308 mutex_unlock(&session->report_mutex); 309 return ret; 310} 311 312static 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 371err: 372 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags); 373 mutex_unlock(&session->report_mutex); 374 return ret; 375} 376 377static 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 386static 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 400static void hidp_idle_timeout(unsigned long arg) 401{ 402 struct hidp_session *session = (struct hidp_session *) arg; 403 404 /* The HIDP user-space API only contains calls to add and remove 405 * devices. There is no way to forward events of any kind. Therefore, 406 * we have to forcefully disconnect a device on idle-timeouts. This is 407 * unfortunate and weird API design, but it is spec-compliant and 408 * required for backwards-compatibility. Hence, on idle-timeout, we 409 * signal driver-detach events, so poll() will be woken up with an 410 * error-condition on both sockets. 411 */ 412 413 session->intr_sock->sk->sk_err = EUNATCH; 414 session->ctrl_sock->sk->sk_err = EUNATCH; 415 wake_up_interruptible(sk_sleep(session->intr_sock->sk)); 416 wake_up_interruptible(sk_sleep(session->ctrl_sock->sk)); 417 418 hidp_session_terminate(session); 419} 420 421static void hidp_set_timer(struct hidp_session *session) 422{ 423 if (session->idle_to > 0) 424 mod_timer(&session->timer, jiffies + HZ * session->idle_to); 425} 426 427static void hidp_del_timer(struct hidp_session *session) 428{ 429 if (session->idle_to > 0) 430 del_timer(&session->timer); 431} 432 433static void hidp_process_report(struct hidp_session *session, 434 int type, const u8 *data, int len, int intr) 435{ 436 if (len > HID_MAX_BUFFER_SIZE) 437 len = HID_MAX_BUFFER_SIZE; 438 439 memcpy(session->input_buf, data, len); 440 hid_input_report(session->hid, type, session->input_buf, len, intr); 441} 442 443static void hidp_process_handshake(struct hidp_session *session, 444 unsigned char param) 445{ 446 BT_DBG("session %p param 0x%02x", session, param); 447 session->output_report_success = 0; /* default condition */ 448 449 switch (param) { 450 case HIDP_HSHK_SUCCESSFUL: 451 /* FIXME: Call into SET_ GET_ handlers here */ 452 session->output_report_success = 1; 453 break; 454 455 case HIDP_HSHK_NOT_READY: 456 case HIDP_HSHK_ERR_INVALID_REPORT_ID: 457 case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST: 458 case HIDP_HSHK_ERR_INVALID_PARAMETER: 459 if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags)) 460 wake_up_interruptible(&session->report_queue); 461 462 /* FIXME: Call into SET_ GET_ handlers here */ 463 break; 464 465 case HIDP_HSHK_ERR_UNKNOWN: 466 break; 467 468 case HIDP_HSHK_ERR_FATAL: 469 /* Device requests a reboot, as this is the only way this error 470 * can be recovered. */ 471 hidp_send_ctrl_message(session, 472 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0); 473 break; 474 475 default: 476 hidp_send_ctrl_message(session, 477 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); 478 break; 479 } 480 481 /* Wake up the waiting thread. */ 482 if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) 483 wake_up_interruptible(&session->report_queue); 484} 485 486static void hidp_process_hid_control(struct hidp_session *session, 487 unsigned char param) 488{ 489 BT_DBG("session %p param 0x%02x", session, param); 490 491 if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) { 492 /* Flush the transmit queues */ 493 skb_queue_purge(&session->ctrl_transmit); 494 skb_queue_purge(&session->intr_transmit); 495 496 hidp_session_terminate(session); 497 } 498} 499 500/* Returns true if the passed-in skb should be freed by the caller. */ 501static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb, 502 unsigned char param) 503{ 504 int done_with_skb = 1; 505 BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param); 506 507 switch (param) { 508 case HIDP_DATA_RTYPE_INPUT: 509 hidp_set_timer(session); 510 511 if (session->input) 512 hidp_input_report(session, skb); 513 514 if (session->hid) 515 hidp_process_report(session, HID_INPUT_REPORT, 516 skb->data, skb->len, 0); 517 break; 518 519 case HIDP_DATA_RTYPE_OTHER: 520 case HIDP_DATA_RTYPE_OUPUT: 521 case HIDP_DATA_RTYPE_FEATURE: 522 break; 523 524 default: 525 hidp_send_ctrl_message(session, 526 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0); 527 } 528 529 if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) && 530 param == session->waiting_report_type) { 531 if (session->waiting_report_number < 0 || 532 session->waiting_report_number == skb->data[0]) { 533 /* hidp_get_raw_report() is waiting on this report. */ 534 session->report_return = skb; 535 done_with_skb = 0; 536 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags); 537 wake_up_interruptible(&session->report_queue); 538 } 539 } 540 541 return done_with_skb; 542} 543 544static void hidp_recv_ctrl_frame(struct hidp_session *session, 545 struct sk_buff *skb) 546{ 547 unsigned char hdr, type, param; 548 int free_skb = 1; 549 550 BT_DBG("session %p skb %p len %d", session, skb, skb->len); 551 552 hdr = skb->data[0]; 553 skb_pull(skb, 1); 554 555 type = hdr & HIDP_HEADER_TRANS_MASK; 556 param = hdr & HIDP_HEADER_PARAM_MASK; 557 558 switch (type) { 559 case HIDP_TRANS_HANDSHAKE: 560 hidp_process_handshake(session, param); 561 break; 562 563 case HIDP_TRANS_HID_CONTROL: 564 hidp_process_hid_control(session, param); 565 break; 566 567 case HIDP_TRANS_DATA: 568 free_skb = hidp_process_data(session, skb, param); 569 break; 570 571 default: 572 hidp_send_ctrl_message(session, 573 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0); 574 break; 575 } 576 577 if (free_skb) 578 kfree_skb(skb); 579} 580 581static void hidp_recv_intr_frame(struct hidp_session *session, 582 struct sk_buff *skb) 583{ 584 unsigned char hdr; 585 586 BT_DBG("session %p skb %p len %d", session, skb, skb->len); 587 588 hdr = skb->data[0]; 589 skb_pull(skb, 1); 590 591 if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) { 592 hidp_set_timer(session); 593 594 if (session->input) 595 hidp_input_report(session, skb); 596 597 if (session->hid) { 598 hidp_process_report(session, HID_INPUT_REPORT, 599 skb->data, skb->len, 1); 600 BT_DBG("report len %d", skb->len); 601 } 602 } else { 603 BT_DBG("Unsupported protocol header 0x%02x", hdr); 604 } 605 606 kfree_skb(skb); 607} 608 609static int hidp_send_frame(struct socket *sock, unsigned char *data, int len) 610{ 611 struct kvec iv = { data, len }; 612 struct msghdr msg; 613 614 BT_DBG("sock %p data %p len %d", sock, data, len); 615 616 if (!len) 617 return 0; 618 619 memset(&msg, 0, sizeof(msg)); 620 621 return kernel_sendmsg(sock, &msg, &iv, 1, len); 622} 623 624/* dequeue message from @transmit and send via @sock */ 625static void hidp_process_transmit(struct hidp_session *session, 626 struct sk_buff_head *transmit, 627 struct socket *sock) 628{ 629 struct sk_buff *skb; 630 int ret; 631 632 BT_DBG("session %p", session); 633 634 while ((skb = skb_dequeue(transmit))) { 635 ret = hidp_send_frame(sock, skb->data, skb->len); 636 if (ret == -EAGAIN) { 637 skb_queue_head(transmit, skb); 638 break; 639 } else if (ret < 0) { 640 hidp_session_terminate(session); 641 kfree_skb(skb); 642 break; 643 } 644 645 hidp_set_timer(session); 646 kfree_skb(skb); 647 } 648} 649 650static int hidp_setup_input(struct hidp_session *session, 651 struct hidp_connadd_req *req) 652{ 653 struct input_dev *input; 654 int i; 655 656 input = input_allocate_device(); 657 if (!input) 658 return -ENOMEM; 659 660 session->input = input; 661 662 input_set_drvdata(input, session); 663 664 input->name = "Bluetooth HID Boot Protocol Device"; 665 666 input->id.bustype = BUS_BLUETOOTH; 667 input->id.vendor = req->vendor; 668 input->id.product = req->product; 669 input->id.version = req->version; 670 671 if (req->subclass & 0x40) { 672 set_bit(EV_KEY, input->evbit); 673 set_bit(EV_LED, input->evbit); 674 set_bit(EV_REP, input->evbit); 675 676 set_bit(LED_NUML, input->ledbit); 677 set_bit(LED_CAPSL, input->ledbit); 678 set_bit(LED_SCROLLL, input->ledbit); 679 set_bit(LED_COMPOSE, input->ledbit); 680 set_bit(LED_KANA, input->ledbit); 681 682 for (i = 0; i < sizeof(hidp_keycode); i++) 683 set_bit(hidp_keycode[i], input->keybit); 684 clear_bit(0, input->keybit); 685 } 686 687 if (req->subclass & 0x80) { 688 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); 689 input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) | 690 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE); 691 input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); 692 input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) | 693 BIT_MASK(BTN_EXTRA); 694 input->relbit[0] |= BIT_MASK(REL_WHEEL); 695 } 696 697 input->dev.parent = &session->conn->hcon->dev; 698 699 input->event = hidp_input_event; 700 701 return 0; 702} 703 704static int hidp_open(struct hid_device *hid) 705{ 706 return 0; 707} 708 709static void hidp_close(struct hid_device *hid) 710{ 711} 712 713static int hidp_parse(struct hid_device *hid) 714{ 715 struct hidp_session *session = hid->driver_data; 716 717 return hid_parse_report(session->hid, session->rd_data, 718 session->rd_size); 719} 720 721static int hidp_start(struct hid_device *hid) 722{ 723 return 0; 724} 725 726static void hidp_stop(struct hid_device *hid) 727{ 728 struct hidp_session *session = hid->driver_data; 729 730 skb_queue_purge(&session->ctrl_transmit); 731 skb_queue_purge(&session->intr_transmit); 732 733 hid->claimed = 0; 734} 735 736static struct hid_ll_driver hidp_hid_driver = { 737 .parse = hidp_parse, 738 .start = hidp_start, 739 .stop = hidp_stop, 740 .open = hidp_open, 741 .close = hidp_close, 742 .raw_request = hidp_raw_request, 743 .output_report = hidp_output_report, 744}; 745 746/* This function sets up the hid device. It does not add it 747 to the HID system. That is done in hidp_add_connection(). */ 748static int hidp_setup_hid(struct hidp_session *session, 749 struct hidp_connadd_req *req) 750{ 751 struct hid_device *hid; 752 int err; 753 754 session->rd_data = memdup_user(req->rd_data, req->rd_size); 755 if (IS_ERR(session->rd_data)) 756 return PTR_ERR(session->rd_data); 757 758 session->rd_size = req->rd_size; 759 760 hid = hid_allocate_device(); 761 if (IS_ERR(hid)) { 762 err = PTR_ERR(hid); 763 goto fault; 764 } 765 766 session->hid = hid; 767 768 hid->driver_data = session; 769 770 hid->bus = BUS_BLUETOOTH; 771 hid->vendor = req->vendor; 772 hid->product = req->product; 773 hid->version = req->version; 774 hid->country = req->country; 775 776 strncpy(hid->name, req->name, sizeof(req->name) - 1); 777 778 snprintf(hid->phys, sizeof(hid->phys), "%pMR", 779 &l2cap_pi(session->ctrl_sock->sk)->chan->src); 780 781 /* NOTE: Some device modules depend on the dst address being stored in 782 * uniq. Please be aware of this before making changes to this behavior. 783 */ 784 snprintf(hid->uniq, sizeof(hid->uniq), "%pMR", 785 &l2cap_pi(session->ctrl_sock->sk)->chan->dst); 786 787 hid->dev.parent = &session->conn->hcon->dev; 788 hid->ll_driver = &hidp_hid_driver; 789 790 /* True if device is blacklisted in drivers/hid/hid-core.c */ 791 if (hid_ignore(hid)) { 792 hid_destroy_device(session->hid); 793 session->hid = NULL; 794 return -ENODEV; 795 } 796 797 return 0; 798 799fault: 800 kfree(session->rd_data); 801 session->rd_data = NULL; 802 803 return err; 804} 805 806/* initialize session devices */ 807static int hidp_session_dev_init(struct hidp_session *session, 808 struct hidp_connadd_req *req) 809{ 810 int ret; 811 812 if (req->rd_size > 0) { 813 ret = hidp_setup_hid(session, req); 814 if (ret && ret != -ENODEV) 815 return ret; 816 } 817 818 if (!session->hid) { 819 ret = hidp_setup_input(session, req); 820 if (ret < 0) 821 return ret; 822 } 823 824 return 0; 825} 826 827/* destroy session devices */ 828static void hidp_session_dev_destroy(struct hidp_session *session) 829{ 830 if (session->hid) 831 put_device(&session->hid->dev); 832 else if (session->input) 833 input_put_device(session->input); 834 835 kfree(session->rd_data); 836 session->rd_data = NULL; 837} 838 839/* add HID/input devices to their underlying bus systems */ 840static int hidp_session_dev_add(struct hidp_session *session) 841{ 842 int ret; 843 844 /* Both HID and input systems drop a ref-count when unregistering the 845 * device but they don't take a ref-count when registering them. Work 846 * around this by explicitly taking a refcount during registration 847 * which is dropped automatically by unregistering the devices. */ 848 849 if (session->hid) { 850 ret = hid_add_device(session->hid); 851 if (ret) 852 return ret; 853 get_device(&session->hid->dev); 854 } else if (session->input) { 855 ret = input_register_device(session->input); 856 if (ret) 857 return ret; 858 input_get_device(session->input); 859 } 860 861 return 0; 862} 863 864/* remove HID/input devices from their bus systems */ 865static void hidp_session_dev_del(struct hidp_session *session) 866{ 867 if (session->hid) 868 hid_destroy_device(session->hid); 869 else if (session->input) 870 input_unregister_device(session->input); 871} 872 873/* 874 * Asynchronous device registration 875 * HID device drivers might want to perform I/O during initialization to 876 * detect device types. Therefore, call device registration in a separate 877 * worker so the HIDP thread can schedule I/O operations. 878 * Note that this must be called after the worker thread was initialized 879 * successfully. This will then add the devices and increase session state 880 * on success, otherwise it will terminate the session thread. 881 */ 882static void hidp_session_dev_work(struct work_struct *work) 883{ 884 struct hidp_session *session = container_of(work, 885 struct hidp_session, 886 dev_init); 887 int ret; 888 889 ret = hidp_session_dev_add(session); 890 if (!ret) 891 atomic_inc(&session->state); 892 else 893 hidp_session_terminate(session); 894} 895 896/* 897 * Create new session object 898 * Allocate session object, initialize static fields, copy input data into the 899 * object and take a reference to all sub-objects. 900 * This returns 0 on success and puts a pointer to the new session object in 901 * \out. Otherwise, an error code is returned. 902 * The new session object has an initial ref-count of 1. 903 */ 904static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr, 905 struct socket *ctrl_sock, 906 struct socket *intr_sock, 907 struct hidp_connadd_req *req, 908 struct l2cap_conn *conn) 909{ 910 struct hidp_session *session; 911 int ret; 912 struct bt_sock *ctrl, *intr; 913 914 ctrl = bt_sk(ctrl_sock->sk); 915 intr = bt_sk(intr_sock->sk); 916 917 session = kzalloc(sizeof(*session), GFP_KERNEL); 918 if (!session) 919 return -ENOMEM; 920 921 /* object and runtime management */ 922 kref_init(&session->ref); 923 atomic_set(&session->state, HIDP_SESSION_IDLING); 924 init_waitqueue_head(&session->state_queue); 925 session->flags = req->flags & BIT(HIDP_BLUETOOTH_VENDOR_ID); 926 927 /* connection management */ 928 bacpy(&session->bdaddr, bdaddr); 929 session->conn = l2cap_conn_get(conn); 930 session->user.probe = hidp_session_probe; 931 session->user.remove = hidp_session_remove; 932 session->ctrl_sock = ctrl_sock; 933 session->intr_sock = intr_sock; 934 skb_queue_head_init(&session->ctrl_transmit); 935 skb_queue_head_init(&session->intr_transmit); 936 session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu, 937 l2cap_pi(ctrl)->chan->imtu); 938 session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu, 939 l2cap_pi(intr)->chan->imtu); 940 session->idle_to = req->idle_to; 941 942 /* device management */ 943 INIT_WORK(&session->dev_init, hidp_session_dev_work); 944 setup_timer(&session->timer, hidp_idle_timeout, 945 (unsigned long)session); 946 947 /* session data */ 948 mutex_init(&session->report_mutex); 949 init_waitqueue_head(&session->report_queue); 950 951 ret = hidp_session_dev_init(session, req); 952 if (ret) 953 goto err_free; 954 955 get_file(session->intr_sock->file); 956 get_file(session->ctrl_sock->file); 957 *out = session; 958 return 0; 959 960err_free: 961 l2cap_conn_put(session->conn); 962 kfree(session); 963 return ret; 964} 965 966/* increase ref-count of the given session by one */ 967static void hidp_session_get(struct hidp_session *session) 968{ 969 kref_get(&session->ref); 970} 971 972/* release callback */ 973static void session_free(struct kref *ref) 974{ 975 struct hidp_session *session = container_of(ref, struct hidp_session, 976 ref); 977 978 hidp_session_dev_destroy(session); 979 skb_queue_purge(&session->ctrl_transmit); 980 skb_queue_purge(&session->intr_transmit); 981 fput(session->intr_sock->file); 982 fput(session->ctrl_sock->file); 983 l2cap_conn_put(session->conn); 984 kfree(session); 985} 986 987/* decrease ref-count of the given session by one */ 988static void hidp_session_put(struct hidp_session *session) 989{ 990 kref_put(&session->ref, session_free); 991} 992 993/* 994 * Search the list of active sessions for a session with target address 995 * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as 996 * you do not release this lock, the session objects cannot vanish and you can 997 * safely take a reference to the session yourself. 998 */ 999static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr) 1000{ 1001 struct hidp_session *session; 1002 1003 list_for_each_entry(session, &hidp_session_list, list) { 1004 if (!bacmp(bdaddr, &session->bdaddr)) 1005 return session; 1006 } 1007 1008 return NULL; 1009} 1010 1011/* 1012 * Same as __hidp_session_find() but no locks must be held. This also takes a 1013 * reference of the returned session (if non-NULL) so you must drop this 1014 * reference if you no longer use the object. 1015 */ 1016static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr) 1017{ 1018 struct hidp_session *session; 1019 1020 down_read(&hidp_session_sem); 1021 1022 session = __hidp_session_find(bdaddr); 1023 if (session) 1024 hidp_session_get(session); 1025 1026 up_read(&hidp_session_sem); 1027 1028 return session; 1029} 1030 1031/* 1032 * Start session synchronously 1033 * This starts a session thread and waits until initialization 1034 * is done or returns an error if it couldn't be started. 1035 * If this returns 0 the session thread is up and running. You must call 1036 * hipd_session_stop_sync() before deleting any runtime resources. 1037 */ 1038static int hidp_session_start_sync(struct hidp_session *session) 1039{ 1040 unsigned int vendor, product; 1041 1042 if (session->hid) { 1043 vendor = session->hid->vendor; 1044 product = session->hid->product; 1045 } else if (session->input) { 1046 vendor = session->input->id.vendor; 1047 product = session->input->id.product; 1048 } else { 1049 vendor = 0x0000; 1050 product = 0x0000; 1051 } 1052 1053 session->task = kthread_run(hidp_session_thread, session, 1054 "khidpd_%04x%04x", vendor, product); 1055 if (IS_ERR(session->task)) 1056 return PTR_ERR(session->task); 1057 1058 while (atomic_read(&session->state) <= HIDP_SESSION_IDLING) 1059 wait_event(session->state_queue, 1060 atomic_read(&session->state) > HIDP_SESSION_IDLING); 1061 1062 return 0; 1063} 1064 1065/* 1066 * Terminate session thread 1067 * Wake up session thread and notify it to stop. This is asynchronous and 1068 * returns immediately. Call this whenever a runtime error occurs and you want 1069 * the session to stop. 1070 * Note: wake_up_process() performs any necessary memory-barriers for us. 1071 */ 1072static void hidp_session_terminate(struct hidp_session *session) 1073{ 1074 atomic_inc(&session->terminate); 1075 wake_up_process(session->task); 1076} 1077 1078/* 1079 * Probe HIDP session 1080 * This is called from the l2cap_conn core when our l2cap_user object is bound 1081 * to the hci-connection. We get the session via the \user object and can now 1082 * start the session thread, link it into the global session list and 1083 * schedule HID/input device registration. 1084 * The global session-list owns its own reference to the session object so you 1085 * can drop your own reference after registering the l2cap_user object. 1086 */ 1087static int hidp_session_probe(struct l2cap_conn *conn, 1088 struct l2cap_user *user) 1089{ 1090 struct hidp_session *session = container_of(user, 1091 struct hidp_session, 1092 user); 1093 struct hidp_session *s; 1094 int ret; 1095 1096 down_write(&hidp_session_sem); 1097 1098 /* check that no other session for this device exists */ 1099 s = __hidp_session_find(&session->bdaddr); 1100 if (s) { 1101 ret = -EEXIST; 1102 goto out_unlock; 1103 } 1104 1105 if (session->input) { 1106 ret = hidp_session_dev_add(session); 1107 if (ret) 1108 goto out_unlock; 1109 } 1110 1111 ret = hidp_session_start_sync(session); 1112 if (ret) 1113 goto out_del; 1114 1115 /* HID device registration is async to allow I/O during probe */ 1116 if (session->input) 1117 atomic_inc(&session->state); 1118 else 1119 schedule_work(&session->dev_init); 1120 1121 hidp_session_get(session); 1122 list_add(&session->list, &hidp_session_list); 1123 ret = 0; 1124 goto out_unlock; 1125 1126out_del: 1127 if (session->input) 1128 hidp_session_dev_del(session); 1129out_unlock: 1130 up_write(&hidp_session_sem); 1131 return ret; 1132} 1133 1134/* 1135 * Remove HIDP session 1136 * Called from the l2cap_conn core when either we explicitly unregistered 1137 * the l2cap_user object or if the underlying connection is shut down. 1138 * We signal the hidp-session thread to shut down, unregister the HID/input 1139 * devices and unlink the session from the global list. 1140 * This drops the reference to the session that is owned by the global 1141 * session-list. 1142 * Note: We _must_ not synchronosly wait for the session-thread to shut down. 1143 * This is, because the session-thread might be waiting for an HCI lock that is 1144 * held while we are called. Therefore, we only unregister the devices and 1145 * notify the session-thread to terminate. The thread itself owns a reference 1146 * to the session object so it can safely shut down. 1147 */ 1148static void hidp_session_remove(struct l2cap_conn *conn, 1149 struct l2cap_user *user) 1150{ 1151 struct hidp_session *session = container_of(user, 1152 struct hidp_session, 1153 user); 1154 1155 down_write(&hidp_session_sem); 1156 1157 hidp_session_terminate(session); 1158 1159 cancel_work_sync(&session->dev_init); 1160 if (session->input || 1161 atomic_read(&session->state) > HIDP_SESSION_PREPARING) 1162 hidp_session_dev_del(session); 1163 1164 list_del(&session->list); 1165 1166 up_write(&hidp_session_sem); 1167 1168 hidp_session_put(session); 1169} 1170 1171/* 1172 * Session Worker 1173 * This performs the actual main-loop of the HIDP worker. We first check 1174 * whether the underlying connection is still alive, then parse all pending 1175 * messages and finally send all outstanding messages. 1176 */ 1177static void hidp_session_run(struct hidp_session *session) 1178{ 1179 struct sock *ctrl_sk = session->ctrl_sock->sk; 1180 struct sock *intr_sk = session->intr_sock->sk; 1181 struct sk_buff *skb; 1182 1183 for (;;) { 1184 /* 1185 * This thread can be woken up two ways: 1186 * - You call hidp_session_terminate() which sets the 1187 * session->terminate flag and wakes this thread up. 1188 * - Via modifying the socket state of ctrl/intr_sock. This 1189 * thread is woken up by ->sk_state_changed(). 1190 * 1191 * Note: set_current_state() performs any necessary 1192 * memory-barriers for us. 1193 */ 1194 set_current_state(TASK_INTERRUPTIBLE); 1195 1196 if (atomic_read(&session->terminate)) 1197 break; 1198 1199 if (ctrl_sk->sk_state != BT_CONNECTED || 1200 intr_sk->sk_state != BT_CONNECTED) 1201 break; 1202 1203 /* parse incoming intr-skbs */ 1204 while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) { 1205 skb_orphan(skb); 1206 if (!skb_linearize(skb)) 1207 hidp_recv_intr_frame(session, skb); 1208 else 1209 kfree_skb(skb); 1210 } 1211 1212 /* send pending intr-skbs */ 1213 hidp_process_transmit(session, &session->intr_transmit, 1214 session->intr_sock); 1215 1216 /* parse incoming ctrl-skbs */ 1217 while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) { 1218 skb_orphan(skb); 1219 if (!skb_linearize(skb)) 1220 hidp_recv_ctrl_frame(session, skb); 1221 else 1222 kfree_skb(skb); 1223 } 1224 1225 /* send pending ctrl-skbs */ 1226 hidp_process_transmit(session, &session->ctrl_transmit, 1227 session->ctrl_sock); 1228 1229 schedule(); 1230 } 1231 1232 atomic_inc(&session->terminate); 1233 set_current_state(TASK_RUNNING); 1234} 1235 1236/* 1237 * HIDP session thread 1238 * This thread runs the I/O for a single HIDP session. Startup is synchronous 1239 * which allows us to take references to ourself here instead of doing that in 1240 * the caller. 1241 * When we are ready to run we notify the caller and call hidp_session_run(). 1242 */ 1243static int hidp_session_thread(void *arg) 1244{ 1245 struct hidp_session *session = arg; 1246 wait_queue_t ctrl_wait, intr_wait; 1247 1248 BT_DBG("session %p", session); 1249 1250 /* initialize runtime environment */ 1251 hidp_session_get(session); 1252 __module_get(THIS_MODULE); 1253 set_user_nice(current, -15); 1254 hidp_set_timer(session); 1255 1256 init_waitqueue_entry(&ctrl_wait, current); 1257 init_waitqueue_entry(&intr_wait, current); 1258 add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait); 1259 add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait); 1260 /* This memory barrier is paired with wq_has_sleeper(). See 1261 * sock_poll_wait() for more information why this is needed. */ 1262 smp_mb(); 1263 1264 /* notify synchronous startup that we're ready */ 1265 atomic_inc(&session->state); 1266 wake_up(&session->state_queue); 1267 1268 /* run session */ 1269 hidp_session_run(session); 1270 1271 /* cleanup runtime environment */ 1272 remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait); 1273 remove_wait_queue(sk_sleep(session->intr_sock->sk), &ctrl_wait); 1274 wake_up_interruptible(&session->report_queue); 1275 hidp_del_timer(session); 1276 1277 /* 1278 * If we stopped ourself due to any internal signal, we should try to 1279 * unregister our own session here to avoid having it linger until the 1280 * parent l2cap_conn dies or user-space cleans it up. 1281 * This does not deadlock as we don't do any synchronous shutdown. 1282 * Instead, this call has the same semantics as if user-space tried to 1283 * delete the session. 1284 */ 1285 l2cap_unregister_user(session->conn, &session->user); 1286 hidp_session_put(session); 1287 1288 module_put_and_exit(0); 1289 return 0; 1290} 1291 1292static int hidp_verify_sockets(struct socket *ctrl_sock, 1293 struct socket *intr_sock) 1294{ 1295 struct l2cap_chan *ctrl_chan, *intr_chan; 1296 struct bt_sock *ctrl, *intr; 1297 struct hidp_session *session; 1298 1299 if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock)) 1300 return -EINVAL; 1301 1302 ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan; 1303 intr_chan = l2cap_pi(intr_sock->sk)->chan; 1304 1305 if (bacmp(&ctrl_chan->src, &intr_chan->src) || 1306 bacmp(&ctrl_chan->dst, &intr_chan->dst)) 1307 return -ENOTUNIQ; 1308 1309 ctrl = bt_sk(ctrl_sock->sk); 1310 intr = bt_sk(intr_sock->sk); 1311 1312 if (ctrl->sk.sk_state != BT_CONNECTED || 1313 intr->sk.sk_state != BT_CONNECTED) 1314 return -EBADFD; 1315 1316 /* early session check, we check again during session registration */ 1317 session = hidp_session_find(&ctrl_chan->dst); 1318 if (session) { 1319 hidp_session_put(session); 1320 return -EEXIST; 1321 } 1322 1323 return 0; 1324} 1325 1326int hidp_connection_add(struct hidp_connadd_req *req, 1327 struct socket *ctrl_sock, 1328 struct socket *intr_sock) 1329{ 1330 u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG) | 1331 BIT(HIDP_BOOT_PROTOCOL_MODE); 1332 struct hidp_session *session; 1333 struct l2cap_conn *conn; 1334 struct l2cap_chan *chan; 1335 int ret; 1336 1337 ret = hidp_verify_sockets(ctrl_sock, intr_sock); 1338 if (ret) 1339 return ret; 1340 1341 if (req->flags & ~valid_flags) 1342 return -EINVAL; 1343 1344 chan = l2cap_pi(ctrl_sock->sk)->chan; 1345 conn = NULL; 1346 l2cap_chan_lock(chan); 1347 if (chan->conn) 1348 conn = l2cap_conn_get(chan->conn); 1349 l2cap_chan_unlock(chan); 1350 1351 if (!conn) 1352 return -EBADFD; 1353 1354 ret = hidp_session_new(&session, &chan->dst, ctrl_sock, 1355 intr_sock, req, conn); 1356 if (ret) 1357 goto out_conn; 1358 1359 ret = l2cap_register_user(conn, &session->user); 1360 if (ret) 1361 goto out_session; 1362 1363 ret = 0; 1364 1365out_session: 1366 hidp_session_put(session); 1367out_conn: 1368 l2cap_conn_put(conn); 1369 return ret; 1370} 1371 1372int hidp_connection_del(struct hidp_conndel_req *req) 1373{ 1374 u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG); 1375 struct hidp_session *session; 1376 1377 if (req->flags & ~valid_flags) 1378 return -EINVAL; 1379 1380 session = hidp_session_find(&req->bdaddr); 1381 if (!session) 1382 return -ENOENT; 1383 1384 if (req->flags & BIT(HIDP_VIRTUAL_CABLE_UNPLUG)) 1385 hidp_send_ctrl_message(session, 1386 HIDP_TRANS_HID_CONTROL | 1387 HIDP_CTRL_VIRTUAL_CABLE_UNPLUG, 1388 NULL, 0); 1389 else 1390 l2cap_unregister_user(session->conn, &session->user); 1391 1392 hidp_session_put(session); 1393 1394 return 0; 1395} 1396 1397int hidp_get_connlist(struct hidp_connlist_req *req) 1398{ 1399 struct hidp_session *session; 1400 int err = 0, n = 0; 1401 1402 BT_DBG(""); 1403 1404 down_read(&hidp_session_sem); 1405 1406 list_for_each_entry(session, &hidp_session_list, list) { 1407 struct hidp_conninfo ci; 1408 1409 hidp_copy_session(session, &ci); 1410 1411 if (copy_to_user(req->ci, &ci, sizeof(ci))) { 1412 err = -EFAULT; 1413 break; 1414 } 1415 1416 if (++n >= req->cnum) 1417 break; 1418 1419 req->ci++; 1420 } 1421 req->cnum = n; 1422 1423 up_read(&hidp_session_sem); 1424 return err; 1425} 1426 1427int hidp_get_conninfo(struct hidp_conninfo *ci) 1428{ 1429 struct hidp_session *session; 1430 1431 session = hidp_session_find(&ci->bdaddr); 1432 if (session) { 1433 hidp_copy_session(session, ci); 1434 hidp_session_put(session); 1435 } 1436 1437 return session ? 0 : -ENOENT; 1438} 1439 1440static int __init hidp_init(void) 1441{ 1442 BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION); 1443 1444 return hidp_init_sockets(); 1445} 1446 1447static void __exit hidp_exit(void) 1448{ 1449 hidp_cleanup_sockets(); 1450} 1451 1452module_init(hidp_init); 1453module_exit(hidp_exit); 1454 1455MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); 1456MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>"); 1457MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION); 1458MODULE_VERSION(VERSION); 1459MODULE_LICENSE("GPL"); 1460MODULE_ALIAS("bt-proto-6"); 1461