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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 DECLARE_WAIT_QUEUE_HEAD(hidp_session_wq);
40static LIST_HEAD(hidp_session_list);
41
42static unsigned char hidp_keycode[256] = {
43 0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36,
44 37, 38, 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45,
45 21, 44, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 28, 1,
46 14, 15, 57, 12, 13, 26, 27, 43, 43, 39, 40, 41, 51, 52,
47 53, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 87, 88,
48 99, 70, 119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103, 69,
49 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71, 72, 73,
50 82, 83, 86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189, 190,
51 191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135,
52 136, 113, 115, 114, 0, 0, 0, 121, 0, 89, 93, 124, 92, 94,
53 95, 0, 0, 0, 122, 123, 90, 91, 85, 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 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
59 29, 42, 56, 125, 97, 54, 100, 126, 164, 166, 165, 163, 161, 115,
60 114, 113, 150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140
61};
62
63static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 };
64
65static int hidp_session_probe(struct l2cap_conn *conn,
66 struct l2cap_user *user);
67static void hidp_session_remove(struct l2cap_conn *conn,
68 struct l2cap_user *user);
69static int hidp_session_thread(void *arg);
70static void hidp_session_terminate(struct hidp_session *s);
71
72static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
73{
74 u32 valid_flags = 0;
75 memset(ci, 0, sizeof(*ci));
76 bacpy(&ci->bdaddr, &session->bdaddr);
77
78 ci->flags = session->flags & valid_flags;
79 ci->state = BT_CONNECTED;
80
81 if (session->input) {
82 ci->vendor = session->input->id.vendor;
83 ci->product = session->input->id.product;
84 ci->version = session->input->id.version;
85 if (session->input->name)
86 strlcpy(ci->name, session->input->name, 128);
87 else
88 strlcpy(ci->name, "HID Boot Device", 128);
89 } else if (session->hid) {
90 ci->vendor = session->hid->vendor;
91 ci->product = session->hid->product;
92 ci->version = session->hid->version;
93 strlcpy(ci->name, session->hid->name, 128);
94 }
95}
96
97/* assemble skb, queue message on @transmit and wake up the session thread */
98static int hidp_send_message(struct hidp_session *session, struct socket *sock,
99 struct sk_buff_head *transmit, unsigned char hdr,
100 const unsigned char *data, int size)
101{
102 struct sk_buff *skb;
103 struct sock *sk = sock->sk;
104
105 BT_DBG("session %p data %p size %d", session, data, size);
106
107 if (atomic_read(&session->terminate))
108 return -EIO;
109
110 skb = alloc_skb(size + 1, GFP_ATOMIC);
111 if (!skb) {
112 BT_ERR("Can't allocate memory for new frame");
113 return -ENOMEM;
114 }
115
116 skb_put_u8(skb, hdr);
117 if (data && size > 0)
118 skb_put_data(skb, data, size);
119
120 skb_queue_tail(transmit, skb);
121 wake_up_interruptible(sk_sleep(sk));
122
123 return 0;
124}
125
126static int hidp_send_ctrl_message(struct hidp_session *session,
127 unsigned char hdr, const unsigned char *data,
128 int size)
129{
130 return hidp_send_message(session, session->ctrl_sock,
131 &session->ctrl_transmit, hdr, data, size);
132}
133
134static int hidp_send_intr_message(struct hidp_session *session,
135 unsigned char hdr, const unsigned char *data,
136 int size)
137{
138 return hidp_send_message(session, session->intr_sock,
139 &session->intr_transmit, hdr, data, size);
140}
141
142static int hidp_input_event(struct input_dev *dev, unsigned int type,
143 unsigned int code, int value)
144{
145 struct hidp_session *session = input_get_drvdata(dev);
146 unsigned char newleds;
147 unsigned char hdr, data[2];
148
149 BT_DBG("session %p type %d code %d value %d",
150 session, type, code, value);
151
152 if (type != EV_LED)
153 return -1;
154
155 newleds = (!!test_bit(LED_KANA, dev->led) << 3) |
156 (!!test_bit(LED_COMPOSE, dev->led) << 3) |
157 (!!test_bit(LED_SCROLLL, dev->led) << 2) |
158 (!!test_bit(LED_CAPSL, dev->led) << 1) |
159 (!!test_bit(LED_NUML, dev->led) << 0);
160
161 if (session->leds == newleds)
162 return 0;
163
164 session->leds = newleds;
165
166 hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
167 data[0] = 0x01;
168 data[1] = newleds;
169
170 return hidp_send_intr_message(session, hdr, data, 2);
171}
172
173static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb)
174{
175 struct input_dev *dev = session->input;
176 unsigned char *keys = session->keys;
177 unsigned char *udata = skb->data + 1;
178 signed char *sdata = skb->data + 1;
179 int i, size = skb->len - 1;
180
181 switch (skb->data[0]) {
182 case 0x01: /* Keyboard report */
183 for (i = 0; i < 8; i++)
184 input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1);
185
186 /* If all the key codes have been set to 0x01, it means
187 * too many keys were pressed at the same time. */
188 if (!memcmp(udata + 2, hidp_mkeyspat, 6))
189 break;
190
191 for (i = 2; i < 8; i++) {
192 if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) {
193 if (hidp_keycode[keys[i]])
194 input_report_key(dev, hidp_keycode[keys[i]], 0);
195 else
196 BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
197 }
198
199 if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) {
200 if (hidp_keycode[udata[i]])
201 input_report_key(dev, hidp_keycode[udata[i]], 1);
202 else
203 BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]);
204 }
205 }
206
207 memcpy(keys, udata, 8);
208 break;
209
210 case 0x02: /* Mouse report */
211 input_report_key(dev, BTN_LEFT, sdata[0] & 0x01);
212 input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02);
213 input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04);
214 input_report_key(dev, BTN_SIDE, sdata[0] & 0x08);
215 input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10);
216
217 input_report_rel(dev, REL_X, sdata[1]);
218 input_report_rel(dev, REL_Y, sdata[2]);
219
220 if (size > 3)
221 input_report_rel(dev, REL_WHEEL, sdata[3]);
222 break;
223 }
224
225 input_sync(dev);
226}
227
228static int hidp_get_raw_report(struct hid_device *hid,
229 unsigned char report_number,
230 unsigned char *data, size_t count,
231 unsigned char report_type)
232{
233 struct hidp_session *session = hid->driver_data;
234 struct sk_buff *skb;
235 size_t len;
236 int numbered_reports = hid->report_enum[report_type].numbered;
237 int ret;
238
239 if (atomic_read(&session->terminate))
240 return -EIO;
241
242 switch (report_type) {
243 case HID_FEATURE_REPORT:
244 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE;
245 break;
246 case HID_INPUT_REPORT:
247 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT;
248 break;
249 case HID_OUTPUT_REPORT:
250 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT;
251 break;
252 default:
253 return -EINVAL;
254 }
255
256 if (mutex_lock_interruptible(&session->report_mutex))
257 return -ERESTARTSYS;
258
259 /* Set up our wait, and send the report request to the device. */
260 session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK;
261 session->waiting_report_number = numbered_reports ? report_number : -1;
262 set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
263 data[0] = report_number;
264 ret = hidp_send_ctrl_message(session, report_type, data, 1);
265 if (ret)
266 goto err;
267
268 /* Wait for the return of the report. The returned report
269 gets put in session->report_return. */
270 while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
271 !atomic_read(&session->terminate)) {
272 int res;
273
274 res = wait_event_interruptible_timeout(session->report_queue,
275 !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)
276 || atomic_read(&session->terminate),
277 5*HZ);
278 if (res == 0) {
279 /* timeout */
280 ret = -EIO;
281 goto err;
282 }
283 if (res < 0) {
284 /* signal */
285 ret = -ERESTARTSYS;
286 goto err;
287 }
288 }
289
290 skb = session->report_return;
291 if (skb) {
292 len = skb->len < count ? skb->len : count;
293 memcpy(data, skb->data, len);
294
295 kfree_skb(skb);
296 session->report_return = NULL;
297 } else {
298 /* Device returned a HANDSHAKE, indicating protocol error. */
299 len = -EIO;
300 }
301
302 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
303 mutex_unlock(&session->report_mutex);
304
305 return len;
306
307err:
308 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
309 mutex_unlock(&session->report_mutex);
310 return ret;
311}
312
313static int hidp_set_raw_report(struct hid_device *hid, unsigned char reportnum,
314 unsigned char *data, size_t count,
315 unsigned char report_type)
316{
317 struct hidp_session *session = hid->driver_data;
318 int ret;
319
320 switch (report_type) {
321 case HID_FEATURE_REPORT:
322 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE;
323 break;
324 case HID_INPUT_REPORT:
325 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_INPUT;
326 break;
327 case HID_OUTPUT_REPORT:
328 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT;
329 break;
330 default:
331 return -EINVAL;
332 }
333
334 if (mutex_lock_interruptible(&session->report_mutex))
335 return -ERESTARTSYS;
336
337 /* Set up our wait, and send the report request to the device. */
338 data[0] = reportnum;
339 set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
340 ret = hidp_send_ctrl_message(session, report_type, data, count);
341 if (ret)
342 goto err;
343
344 /* Wait for the ACK from the device. */
345 while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) &&
346 !atomic_read(&session->terminate)) {
347 int res;
348
349 res = wait_event_interruptible_timeout(session->report_queue,
350 !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)
351 || atomic_read(&session->terminate),
352 10*HZ);
353 if (res == 0) {
354 /* timeout */
355 ret = -EIO;
356 goto err;
357 }
358 if (res < 0) {
359 /* signal */
360 ret = -ERESTARTSYS;
361 goto err;
362 }
363 }
364
365 if (!session->output_report_success) {
366 ret = -EIO;
367 goto err;
368 }
369
370 ret = count;
371
372err:
373 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
374 mutex_unlock(&session->report_mutex);
375 return ret;
376}
377
378static int hidp_output_report(struct hid_device *hid, __u8 *data, size_t count)
379{
380 struct hidp_session *session = hid->driver_data;
381
382 return hidp_send_intr_message(session,
383 HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT,
384 data, count);
385}
386
387static int hidp_raw_request(struct hid_device *hid, unsigned char reportnum,
388 __u8 *buf, size_t len, unsigned char rtype,
389 int reqtype)
390{
391 switch (reqtype) {
392 case HID_REQ_GET_REPORT:
393 return hidp_get_raw_report(hid, reportnum, buf, len, rtype);
394 case HID_REQ_SET_REPORT:
395 return hidp_set_raw_report(hid, reportnum, buf, len, rtype);
396 default:
397 return -EIO;
398 }
399}
400
401static void hidp_idle_timeout(struct timer_list *t)
402{
403 struct hidp_session *session = from_timer(session, t, timer);
404
405 /* The HIDP user-space API only contains calls to add and remove
406 * devices. There is no way to forward events of any kind. Therefore,
407 * we have to forcefully disconnect a device on idle-timeouts. This is
408 * unfortunate and weird API design, but it is spec-compliant and
409 * required for backwards-compatibility. Hence, on idle-timeout, we
410 * signal driver-detach events, so poll() will be woken up with an
411 * error-condition on both sockets.
412 */
413
414 session->intr_sock->sk->sk_err = EUNATCH;
415 session->ctrl_sock->sk->sk_err = EUNATCH;
416 wake_up_interruptible(sk_sleep(session->intr_sock->sk));
417 wake_up_interruptible(sk_sleep(session->ctrl_sock->sk));
418
419 hidp_session_terminate(session);
420}
421
422static void hidp_set_timer(struct hidp_session *session)
423{
424 if (session->idle_to > 0)
425 mod_timer(&session->timer, jiffies + HZ * session->idle_to);
426}
427
428static void hidp_del_timer(struct hidp_session *session)
429{
430 if (session->idle_to > 0)
431 del_timer(&session->timer);
432}
433
434static void hidp_process_report(struct hidp_session *session,
435 int type, const u8 *data, int len, int intr)
436{
437 if (len > HID_MAX_BUFFER_SIZE)
438 len = HID_MAX_BUFFER_SIZE;
439
440 memcpy(session->input_buf, data, len);
441 hid_input_report(session->hid, type, session->input_buf, len, intr);
442}
443
444static void hidp_process_handshake(struct hidp_session *session,
445 unsigned char param)
446{
447 BT_DBG("session %p param 0x%02x", session, param);
448 session->output_report_success = 0; /* default condition */
449
450 switch (param) {
451 case HIDP_HSHK_SUCCESSFUL:
452 /* FIXME: Call into SET_ GET_ handlers here */
453 session->output_report_success = 1;
454 break;
455
456 case HIDP_HSHK_NOT_READY:
457 case HIDP_HSHK_ERR_INVALID_REPORT_ID:
458 case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST:
459 case HIDP_HSHK_ERR_INVALID_PARAMETER:
460 if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags))
461 wake_up_interruptible(&session->report_queue);
462
463 /* FIXME: Call into SET_ GET_ handlers here */
464 break;
465
466 case HIDP_HSHK_ERR_UNKNOWN:
467 break;
468
469 case HIDP_HSHK_ERR_FATAL:
470 /* Device requests a reboot, as this is the only way this error
471 * can be recovered. */
472 hidp_send_ctrl_message(session,
473 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0);
474 break;
475
476 default:
477 hidp_send_ctrl_message(session,
478 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
479 break;
480 }
481
482 /* Wake up the waiting thread. */
483 if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags))
484 wake_up_interruptible(&session->report_queue);
485}
486
487static void hidp_process_hid_control(struct hidp_session *session,
488 unsigned char param)
489{
490 BT_DBG("session %p param 0x%02x", session, param);
491
492 if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) {
493 /* Flush the transmit queues */
494 skb_queue_purge(&session->ctrl_transmit);
495 skb_queue_purge(&session->intr_transmit);
496
497 hidp_session_terminate(session);
498 }
499}
500
501/* Returns true if the passed-in skb should be freed by the caller. */
502static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb,
503 unsigned char param)
504{
505 int done_with_skb = 1;
506 BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param);
507
508 switch (param) {
509 case HIDP_DATA_RTYPE_INPUT:
510 hidp_set_timer(session);
511
512 if (session->input)
513 hidp_input_report(session, skb);
514
515 if (session->hid)
516 hidp_process_report(session, HID_INPUT_REPORT,
517 skb->data, skb->len, 0);
518 break;
519
520 case HIDP_DATA_RTYPE_OTHER:
521 case HIDP_DATA_RTYPE_OUPUT:
522 case HIDP_DATA_RTYPE_FEATURE:
523 break;
524
525 default:
526 hidp_send_ctrl_message(session,
527 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
528 }
529
530 if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
531 param == session->waiting_report_type) {
532 if (session->waiting_report_number < 0 ||
533 session->waiting_report_number == skb->data[0]) {
534 /* hidp_get_raw_report() is waiting on this report. */
535 session->report_return = skb;
536 done_with_skb = 0;
537 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
538 wake_up_interruptible(&session->report_queue);
539 }
540 }
541
542 return done_with_skb;
543}
544
545static void hidp_recv_ctrl_frame(struct hidp_session *session,
546 struct sk_buff *skb)
547{
548 unsigned char hdr, type, param;
549 int free_skb = 1;
550
551 BT_DBG("session %p skb %p len %d", session, skb, skb->len);
552
553 hdr = skb->data[0];
554 skb_pull(skb, 1);
555
556 type = hdr & HIDP_HEADER_TRANS_MASK;
557 param = hdr & HIDP_HEADER_PARAM_MASK;
558
559 switch (type) {
560 case HIDP_TRANS_HANDSHAKE:
561 hidp_process_handshake(session, param);
562 break;
563
564 case HIDP_TRANS_HID_CONTROL:
565 hidp_process_hid_control(session, param);
566 break;
567
568 case HIDP_TRANS_DATA:
569 free_skb = hidp_process_data(session, skb, param);
570 break;
571
572 default:
573 hidp_send_ctrl_message(session,
574 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0);
575 break;
576 }
577
578 if (free_skb)
579 kfree_skb(skb);
580}
581
582static void hidp_recv_intr_frame(struct hidp_session *session,
583 struct sk_buff *skb)
584{
585 unsigned char hdr;
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 if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) {
593 hidp_set_timer(session);
594
595 if (session->input)
596 hidp_input_report(session, skb);
597
598 if (session->hid) {
599 hidp_process_report(session, HID_INPUT_REPORT,
600 skb->data, skb->len, 1);
601 BT_DBG("report len %d", skb->len);
602 }
603 } else {
604 BT_DBG("Unsupported protocol header 0x%02x", hdr);
605 }
606
607 kfree_skb(skb);
608}
609
610static int hidp_send_frame(struct socket *sock, unsigned char *data, int len)
611{
612 struct kvec iv = { data, len };
613 struct msghdr msg;
614
615 BT_DBG("sock %p data %p len %d", sock, data, len);
616
617 if (!len)
618 return 0;
619
620 memset(&msg, 0, sizeof(msg));
621
622 return kernel_sendmsg(sock, &msg, &iv, 1, len);
623}
624
625/* dequeue message from @transmit and send via @sock */
626static void hidp_process_transmit(struct hidp_session *session,
627 struct sk_buff_head *transmit,
628 struct socket *sock)
629{
630 struct sk_buff *skb;
631 int ret;
632
633 BT_DBG("session %p", session);
634
635 while ((skb = skb_dequeue(transmit))) {
636 ret = hidp_send_frame(sock, skb->data, skb->len);
637 if (ret == -EAGAIN) {
638 skb_queue_head(transmit, skb);
639 break;
640 } else if (ret < 0) {
641 hidp_session_terminate(session);
642 kfree_skb(skb);
643 break;
644 }
645
646 hidp_set_timer(session);
647 kfree_skb(skb);
648 }
649}
650
651static int hidp_setup_input(struct hidp_session *session,
652 struct hidp_connadd_req *req)
653{
654 struct input_dev *input;
655 int i;
656
657 input = input_allocate_device();
658 if (!input)
659 return -ENOMEM;
660
661 session->input = input;
662
663 input_set_drvdata(input, session);
664
665 input->name = "Bluetooth HID Boot Protocol Device";
666
667 input->id.bustype = BUS_BLUETOOTH;
668 input->id.vendor = req->vendor;
669 input->id.product = req->product;
670 input->id.version = req->version;
671
672 if (req->subclass & 0x40) {
673 set_bit(EV_KEY, input->evbit);
674 set_bit(EV_LED, input->evbit);
675 set_bit(EV_REP, input->evbit);
676
677 set_bit(LED_NUML, input->ledbit);
678 set_bit(LED_CAPSL, input->ledbit);
679 set_bit(LED_SCROLLL, input->ledbit);
680 set_bit(LED_COMPOSE, input->ledbit);
681 set_bit(LED_KANA, input->ledbit);
682
683 for (i = 0; i < sizeof(hidp_keycode); i++)
684 set_bit(hidp_keycode[i], input->keybit);
685 clear_bit(0, input->keybit);
686 }
687
688 if (req->subclass & 0x80) {
689 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
690 input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
691 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
692 input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
693 input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
694 BIT_MASK(BTN_EXTRA);
695 input->relbit[0] |= BIT_MASK(REL_WHEEL);
696 }
697
698 input->dev.parent = &session->conn->hcon->dev;
699
700 input->event = hidp_input_event;
701
702 return 0;
703}
704
705static int hidp_open(struct hid_device *hid)
706{
707 return 0;
708}
709
710static void hidp_close(struct hid_device *hid)
711{
712}
713
714static int hidp_parse(struct hid_device *hid)
715{
716 struct hidp_session *session = hid->driver_data;
717
718 return hid_parse_report(session->hid, session->rd_data,
719 session->rd_size);
720}
721
722static int hidp_start(struct hid_device *hid)
723{
724 return 0;
725}
726
727static void hidp_stop(struct hid_device *hid)
728{
729 struct hidp_session *session = hid->driver_data;
730
731 skb_queue_purge(&session->ctrl_transmit);
732 skb_queue_purge(&session->intr_transmit);
733
734 hid->claimed = 0;
735}
736
737struct hid_ll_driver hidp_hid_driver = {
738 .parse = hidp_parse,
739 .start = hidp_start,
740 .stop = hidp_stop,
741 .open = hidp_open,
742 .close = hidp_close,
743 .raw_request = hidp_raw_request,
744 .output_report = hidp_output_report,
745};
746EXPORT_SYMBOL_GPL(hidp_hid_driver);
747
748/* This function sets up the hid device. It does not add it
749 to the HID system. That is done in hidp_add_connection(). */
750static int hidp_setup_hid(struct hidp_session *session,
751 struct hidp_connadd_req *req)
752{
753 struct hid_device *hid;
754 int err;
755
756 session->rd_data = memdup_user(req->rd_data, req->rd_size);
757 if (IS_ERR(session->rd_data))
758 return PTR_ERR(session->rd_data);
759
760 session->rd_size = req->rd_size;
761
762 hid = hid_allocate_device();
763 if (IS_ERR(hid)) {
764 err = PTR_ERR(hid);
765 goto fault;
766 }
767
768 session->hid = hid;
769
770 hid->driver_data = session;
771
772 hid->bus = BUS_BLUETOOTH;
773 hid->vendor = req->vendor;
774 hid->product = req->product;
775 hid->version = req->version;
776 hid->country = req->country;
777
778 strncpy(hid->name, req->name, sizeof(req->name) - 1);
779
780 snprintf(hid->phys, sizeof(hid->phys), "%pMR",
781 &l2cap_pi(session->ctrl_sock->sk)->chan->src);
782
783 /* NOTE: Some device modules depend on the dst address being stored in
784 * uniq. Please be aware of this before making changes to this behavior.
785 */
786 snprintf(hid->uniq, sizeof(hid->uniq), "%pMR",
787 &l2cap_pi(session->ctrl_sock->sk)->chan->dst);
788
789 hid->dev.parent = &session->conn->hcon->dev;
790 hid->ll_driver = &hidp_hid_driver;
791
792 /* True if device is blacklisted in drivers/hid/hid-quirks.c */
793 if (hid_ignore(hid)) {
794 hid_destroy_device(session->hid);
795 session->hid = NULL;
796 return -ENODEV;
797 }
798
799 return 0;
800
801fault:
802 kfree(session->rd_data);
803 session->rd_data = NULL;
804
805 return err;
806}
807
808/* initialize session devices */
809static int hidp_session_dev_init(struct hidp_session *session,
810 struct hidp_connadd_req *req)
811{
812 int ret;
813
814 if (req->rd_size > 0) {
815 ret = hidp_setup_hid(session, req);
816 if (ret && ret != -ENODEV)
817 return ret;
818 }
819
820 if (!session->hid) {
821 ret = hidp_setup_input(session, req);
822 if (ret < 0)
823 return ret;
824 }
825
826 return 0;
827}
828
829/* destroy session devices */
830static void hidp_session_dev_destroy(struct hidp_session *session)
831{
832 if (session->hid)
833 put_device(&session->hid->dev);
834 else if (session->input)
835 input_put_device(session->input);
836
837 kfree(session->rd_data);
838 session->rd_data = NULL;
839}
840
841/* add HID/input devices to their underlying bus systems */
842static int hidp_session_dev_add(struct hidp_session *session)
843{
844 int ret;
845
846 /* Both HID and input systems drop a ref-count when unregistering the
847 * device but they don't take a ref-count when registering them. Work
848 * around this by explicitly taking a refcount during registration
849 * which is dropped automatically by unregistering the devices. */
850
851 if (session->hid) {
852 ret = hid_add_device(session->hid);
853 if (ret)
854 return ret;
855 get_device(&session->hid->dev);
856 } else if (session->input) {
857 ret = input_register_device(session->input);
858 if (ret)
859 return ret;
860 input_get_device(session->input);
861 }
862
863 return 0;
864}
865
866/* remove HID/input devices from their bus systems */
867static void hidp_session_dev_del(struct hidp_session *session)
868{
869 if (session->hid)
870 hid_destroy_device(session->hid);
871 else if (session->input)
872 input_unregister_device(session->input);
873}
874
875/*
876 * Asynchronous device registration
877 * HID device drivers might want to perform I/O during initialization to
878 * detect device types. Therefore, call device registration in a separate
879 * worker so the HIDP thread can schedule I/O operations.
880 * Note that this must be called after the worker thread was initialized
881 * successfully. This will then add the devices and increase session state
882 * on success, otherwise it will terminate the session thread.
883 */
884static void hidp_session_dev_work(struct work_struct *work)
885{
886 struct hidp_session *session = container_of(work,
887 struct hidp_session,
888 dev_init);
889 int ret;
890
891 ret = hidp_session_dev_add(session);
892 if (!ret)
893 atomic_inc(&session->state);
894 else
895 hidp_session_terminate(session);
896}
897
898/*
899 * Create new session object
900 * Allocate session object, initialize static fields, copy input data into the
901 * object and take a reference to all sub-objects.
902 * This returns 0 on success and puts a pointer to the new session object in
903 * \out. Otherwise, an error code is returned.
904 * The new session object has an initial ref-count of 1.
905 */
906static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
907 struct socket *ctrl_sock,
908 struct socket *intr_sock,
909 struct hidp_connadd_req *req,
910 struct l2cap_conn *conn)
911{
912 struct hidp_session *session;
913 int ret;
914 struct bt_sock *ctrl, *intr;
915
916 ctrl = bt_sk(ctrl_sock->sk);
917 intr = bt_sk(intr_sock->sk);
918
919 session = kzalloc(sizeof(*session), GFP_KERNEL);
920 if (!session)
921 return -ENOMEM;
922
923 /* object and runtime management */
924 kref_init(&session->ref);
925 atomic_set(&session->state, HIDP_SESSION_IDLING);
926 init_waitqueue_head(&session->state_queue);
927 session->flags = req->flags & BIT(HIDP_BLUETOOTH_VENDOR_ID);
928
929 /* connection management */
930 bacpy(&session->bdaddr, bdaddr);
931 session->conn = l2cap_conn_get(conn);
932 session->user.probe = hidp_session_probe;
933 session->user.remove = hidp_session_remove;
934 INIT_LIST_HEAD(&session->user.list);
935 session->ctrl_sock = ctrl_sock;
936 session->intr_sock = intr_sock;
937 skb_queue_head_init(&session->ctrl_transmit);
938 skb_queue_head_init(&session->intr_transmit);
939 session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu,
940 l2cap_pi(ctrl)->chan->imtu);
941 session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu,
942 l2cap_pi(intr)->chan->imtu);
943 session->idle_to = req->idle_to;
944
945 /* device management */
946 INIT_WORK(&session->dev_init, hidp_session_dev_work);
947 timer_setup(&session->timer, hidp_idle_timeout, 0);
948
949 /* session data */
950 mutex_init(&session->report_mutex);
951 init_waitqueue_head(&session->report_queue);
952
953 ret = hidp_session_dev_init(session, req);
954 if (ret)
955 goto err_free;
956
957 get_file(session->intr_sock->file);
958 get_file(session->ctrl_sock->file);
959 *out = session;
960 return 0;
961
962err_free:
963 l2cap_conn_put(session->conn);
964 kfree(session);
965 return ret;
966}
967
968/* increase ref-count of the given session by one */
969static void hidp_session_get(struct hidp_session *session)
970{
971 kref_get(&session->ref);
972}
973
974/* release callback */
975static void session_free(struct kref *ref)
976{
977 struct hidp_session *session = container_of(ref, struct hidp_session,
978 ref);
979
980 hidp_session_dev_destroy(session);
981 skb_queue_purge(&session->ctrl_transmit);
982 skb_queue_purge(&session->intr_transmit);
983 fput(session->intr_sock->file);
984 fput(session->ctrl_sock->file);
985 l2cap_conn_put(session->conn);
986 kfree(session);
987}
988
989/* decrease ref-count of the given session by one */
990static void hidp_session_put(struct hidp_session *session)
991{
992 kref_put(&session->ref, session_free);
993}
994
995/*
996 * Search the list of active sessions for a session with target address
997 * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as
998 * you do not release this lock, the session objects cannot vanish and you can
999 * safely take a reference to the session yourself.
1000 */
1001static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr)
1002{
1003 struct hidp_session *session;
1004
1005 list_for_each_entry(session, &hidp_session_list, list) {
1006 if (!bacmp(bdaddr, &session->bdaddr))
1007 return session;
1008 }
1009
1010 return NULL;
1011}
1012
1013/*
1014 * Same as __hidp_session_find() but no locks must be held. This also takes a
1015 * reference of the returned session (if non-NULL) so you must drop this
1016 * reference if you no longer use the object.
1017 */
1018static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr)
1019{
1020 struct hidp_session *session;
1021
1022 down_read(&hidp_session_sem);
1023
1024 session = __hidp_session_find(bdaddr);
1025 if (session)
1026 hidp_session_get(session);
1027
1028 up_read(&hidp_session_sem);
1029
1030 return session;
1031}
1032
1033/*
1034 * Start session synchronously
1035 * This starts a session thread and waits until initialization
1036 * is done or returns an error if it couldn't be started.
1037 * If this returns 0 the session thread is up and running. You must call
1038 * hipd_session_stop_sync() before deleting any runtime resources.
1039 */
1040static int hidp_session_start_sync(struct hidp_session *session)
1041{
1042 unsigned int vendor, product;
1043
1044 if (session->hid) {
1045 vendor = session->hid->vendor;
1046 product = session->hid->product;
1047 } else if (session->input) {
1048 vendor = session->input->id.vendor;
1049 product = session->input->id.product;
1050 } else {
1051 vendor = 0x0000;
1052 product = 0x0000;
1053 }
1054
1055 session->task = kthread_run(hidp_session_thread, session,
1056 "khidpd_%04x%04x", vendor, product);
1057 if (IS_ERR(session->task))
1058 return PTR_ERR(session->task);
1059
1060 while (atomic_read(&session->state) <= HIDP_SESSION_IDLING)
1061 wait_event(session->state_queue,
1062 atomic_read(&session->state) > HIDP_SESSION_IDLING);
1063
1064 return 0;
1065}
1066
1067/*
1068 * Terminate session thread
1069 * Wake up session thread and notify it to stop. This is asynchronous and
1070 * returns immediately. Call this whenever a runtime error occurs and you want
1071 * the session to stop.
1072 * Note: wake_up_interruptible() performs any necessary memory-barriers for us.
1073 */
1074static void hidp_session_terminate(struct hidp_session *session)
1075{
1076 atomic_inc(&session->terminate);
1077 wake_up_interruptible(&hidp_session_wq);
1078}
1079
1080/*
1081 * Probe HIDP session
1082 * This is called from the l2cap_conn core when our l2cap_user object is bound
1083 * to the hci-connection. We get the session via the \user object and can now
1084 * start the session thread, link it into the global session list and
1085 * schedule HID/input device registration.
1086 * The global session-list owns its own reference to the session object so you
1087 * can drop your own reference after registering the l2cap_user object.
1088 */
1089static int hidp_session_probe(struct l2cap_conn *conn,
1090 struct l2cap_user *user)
1091{
1092 struct hidp_session *session = container_of(user,
1093 struct hidp_session,
1094 user);
1095 struct hidp_session *s;
1096 int ret;
1097
1098 down_write(&hidp_session_sem);
1099
1100 /* check that no other session for this device exists */
1101 s = __hidp_session_find(&session->bdaddr);
1102 if (s) {
1103 ret = -EEXIST;
1104 goto out_unlock;
1105 }
1106
1107 if (session->input) {
1108 ret = hidp_session_dev_add(session);
1109 if (ret)
1110 goto out_unlock;
1111 }
1112
1113 ret = hidp_session_start_sync(session);
1114 if (ret)
1115 goto out_del;
1116
1117 /* HID device registration is async to allow I/O during probe */
1118 if (session->input)
1119 atomic_inc(&session->state);
1120 else
1121 schedule_work(&session->dev_init);
1122
1123 hidp_session_get(session);
1124 list_add(&session->list, &hidp_session_list);
1125 ret = 0;
1126 goto out_unlock;
1127
1128out_del:
1129 if (session->input)
1130 hidp_session_dev_del(session);
1131out_unlock:
1132 up_write(&hidp_session_sem);
1133 return ret;
1134}
1135
1136/*
1137 * Remove HIDP session
1138 * Called from the l2cap_conn core when either we explicitly unregistered
1139 * the l2cap_user object or if the underlying connection is shut down.
1140 * We signal the hidp-session thread to shut down, unregister the HID/input
1141 * devices and unlink the session from the global list.
1142 * This drops the reference to the session that is owned by the global
1143 * session-list.
1144 * Note: We _must_ not synchronosly wait for the session-thread to shut down.
1145 * This is, because the session-thread might be waiting for an HCI lock that is
1146 * held while we are called. Therefore, we only unregister the devices and
1147 * notify the session-thread to terminate. The thread itself owns a reference
1148 * to the session object so it can safely shut down.
1149 */
1150static void hidp_session_remove(struct l2cap_conn *conn,
1151 struct l2cap_user *user)
1152{
1153 struct hidp_session *session = container_of(user,
1154 struct hidp_session,
1155 user);
1156
1157 down_write(&hidp_session_sem);
1158
1159 hidp_session_terminate(session);
1160
1161 cancel_work_sync(&session->dev_init);
1162 if (session->input ||
1163 atomic_read(&session->state) > HIDP_SESSION_PREPARING)
1164 hidp_session_dev_del(session);
1165
1166 list_del(&session->list);
1167
1168 up_write(&hidp_session_sem);
1169
1170 hidp_session_put(session);
1171}
1172
1173/*
1174 * Session Worker
1175 * This performs the actual main-loop of the HIDP worker. We first check
1176 * whether the underlying connection is still alive, then parse all pending
1177 * messages and finally send all outstanding messages.
1178 */
1179static void hidp_session_run(struct hidp_session *session)
1180{
1181 struct sock *ctrl_sk = session->ctrl_sock->sk;
1182 struct sock *intr_sk = session->intr_sock->sk;
1183 struct sk_buff *skb;
1184 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1185
1186 add_wait_queue(&hidp_session_wq, &wait);
1187 for (;;) {
1188 /*
1189 * This thread can be woken up two ways:
1190 * - You call hidp_session_terminate() which sets the
1191 * session->terminate flag and wakes this thread up.
1192 * - Via modifying the socket state of ctrl/intr_sock. This
1193 * thread is woken up by ->sk_state_changed().
1194 */
1195
1196 /* Ensure session->terminate is updated */
1197 smp_mb__before_atomic();
1198 if (atomic_read(&session->terminate))
1199 break;
1200
1201 if (ctrl_sk->sk_state != BT_CONNECTED ||
1202 intr_sk->sk_state != BT_CONNECTED)
1203 break;
1204
1205 /* parse incoming intr-skbs */
1206 while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
1207 skb_orphan(skb);
1208 if (!skb_linearize(skb))
1209 hidp_recv_intr_frame(session, skb);
1210 else
1211 kfree_skb(skb);
1212 }
1213
1214 /* send pending intr-skbs */
1215 hidp_process_transmit(session, &session->intr_transmit,
1216 session->intr_sock);
1217
1218 /* parse incoming ctrl-skbs */
1219 while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
1220 skb_orphan(skb);
1221 if (!skb_linearize(skb))
1222 hidp_recv_ctrl_frame(session, skb);
1223 else
1224 kfree_skb(skb);
1225 }
1226
1227 /* send pending ctrl-skbs */
1228 hidp_process_transmit(session, &session->ctrl_transmit,
1229 session->ctrl_sock);
1230
1231 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
1232 }
1233 remove_wait_queue(&hidp_session_wq, &wait);
1234
1235 atomic_inc(&session->terminate);
1236
1237 /* Ensure session->terminate is updated */
1238 smp_mb__after_atomic();
1239}
1240
1241static int hidp_session_wake_function(wait_queue_entry_t *wait,
1242 unsigned int mode,
1243 int sync, void *key)
1244{
1245 wake_up_interruptible(&hidp_session_wq);
1246 return false;
1247}
1248
1249/*
1250 * HIDP session thread
1251 * This thread runs the I/O for a single HIDP session. Startup is synchronous
1252 * which allows us to take references to ourself here instead of doing that in
1253 * the caller.
1254 * When we are ready to run we notify the caller and call hidp_session_run().
1255 */
1256static int hidp_session_thread(void *arg)
1257{
1258 struct hidp_session *session = arg;
1259 DEFINE_WAIT_FUNC(ctrl_wait, hidp_session_wake_function);
1260 DEFINE_WAIT_FUNC(intr_wait, hidp_session_wake_function);
1261
1262 BT_DBG("session %p", session);
1263
1264 /* initialize runtime environment */
1265 hidp_session_get(session);
1266 __module_get(THIS_MODULE);
1267 set_user_nice(current, -15);
1268 hidp_set_timer(session);
1269
1270 add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait);
1271 add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1272 /* This memory barrier is paired with wq_has_sleeper(). See
1273 * sock_poll_wait() for more information why this is needed. */
1274 smp_mb();
1275
1276 /* notify synchronous startup that we're ready */
1277 atomic_inc(&session->state);
1278 wake_up(&session->state_queue);
1279
1280 /* run session */
1281 hidp_session_run(session);
1282
1283 /* cleanup runtime environment */
1284 remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1285 remove_wait_queue(sk_sleep(session->intr_sock->sk), &ctrl_wait);
1286 wake_up_interruptible(&session->report_queue);
1287 hidp_del_timer(session);
1288
1289 /*
1290 * If we stopped ourself due to any internal signal, we should try to
1291 * unregister our own session here to avoid having it linger until the
1292 * parent l2cap_conn dies or user-space cleans it up.
1293 * This does not deadlock as we don't do any synchronous shutdown.
1294 * Instead, this call has the same semantics as if user-space tried to
1295 * delete the session.
1296 */
1297 l2cap_unregister_user(session->conn, &session->user);
1298 hidp_session_put(session);
1299
1300 module_put_and_exit(0);
1301 return 0;
1302}
1303
1304static int hidp_verify_sockets(struct socket *ctrl_sock,
1305 struct socket *intr_sock)
1306{
1307 struct l2cap_chan *ctrl_chan, *intr_chan;
1308 struct bt_sock *ctrl, *intr;
1309 struct hidp_session *session;
1310
1311 if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock))
1312 return -EINVAL;
1313
1314 ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan;
1315 intr_chan = l2cap_pi(intr_sock->sk)->chan;
1316
1317 if (bacmp(&ctrl_chan->src, &intr_chan->src) ||
1318 bacmp(&ctrl_chan->dst, &intr_chan->dst))
1319 return -ENOTUNIQ;
1320
1321 ctrl = bt_sk(ctrl_sock->sk);
1322 intr = bt_sk(intr_sock->sk);
1323
1324 if (ctrl->sk.sk_state != BT_CONNECTED ||
1325 intr->sk.sk_state != BT_CONNECTED)
1326 return -EBADFD;
1327
1328 /* early session check, we check again during session registration */
1329 session = hidp_session_find(&ctrl_chan->dst);
1330 if (session) {
1331 hidp_session_put(session);
1332 return -EEXIST;
1333 }
1334
1335 return 0;
1336}
1337
1338int hidp_connection_add(struct hidp_connadd_req *req,
1339 struct socket *ctrl_sock,
1340 struct socket *intr_sock)
1341{
1342 u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG) |
1343 BIT(HIDP_BOOT_PROTOCOL_MODE);
1344 struct hidp_session *session;
1345 struct l2cap_conn *conn;
1346 struct l2cap_chan *chan;
1347 int ret;
1348
1349 ret = hidp_verify_sockets(ctrl_sock, intr_sock);
1350 if (ret)
1351 return ret;
1352
1353 if (req->flags & ~valid_flags)
1354 return -EINVAL;
1355
1356 chan = l2cap_pi(ctrl_sock->sk)->chan;
1357 conn = NULL;
1358 l2cap_chan_lock(chan);
1359 if (chan->conn)
1360 conn = l2cap_conn_get(chan->conn);
1361 l2cap_chan_unlock(chan);
1362
1363 if (!conn)
1364 return -EBADFD;
1365
1366 ret = hidp_session_new(&session, &chan->dst, ctrl_sock,
1367 intr_sock, req, conn);
1368 if (ret)
1369 goto out_conn;
1370
1371 ret = l2cap_register_user(conn, &session->user);
1372 if (ret)
1373 goto out_session;
1374
1375 ret = 0;
1376
1377out_session:
1378 hidp_session_put(session);
1379out_conn:
1380 l2cap_conn_put(conn);
1381 return ret;
1382}
1383
1384int hidp_connection_del(struct hidp_conndel_req *req)
1385{
1386 u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG);
1387 struct hidp_session *session;
1388
1389 if (req->flags & ~valid_flags)
1390 return -EINVAL;
1391
1392 session = hidp_session_find(&req->bdaddr);
1393 if (!session)
1394 return -ENOENT;
1395
1396 if (req->flags & BIT(HIDP_VIRTUAL_CABLE_UNPLUG))
1397 hidp_send_ctrl_message(session,
1398 HIDP_TRANS_HID_CONTROL |
1399 HIDP_CTRL_VIRTUAL_CABLE_UNPLUG,
1400 NULL, 0);
1401 else
1402 l2cap_unregister_user(session->conn, &session->user);
1403
1404 hidp_session_put(session);
1405
1406 return 0;
1407}
1408
1409int hidp_get_connlist(struct hidp_connlist_req *req)
1410{
1411 struct hidp_session *session;
1412 int err = 0, n = 0;
1413
1414 BT_DBG("");
1415
1416 down_read(&hidp_session_sem);
1417
1418 list_for_each_entry(session, &hidp_session_list, list) {
1419 struct hidp_conninfo ci;
1420
1421 hidp_copy_session(session, &ci);
1422
1423 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
1424 err = -EFAULT;
1425 break;
1426 }
1427
1428 if (++n >= req->cnum)
1429 break;
1430
1431 req->ci++;
1432 }
1433 req->cnum = n;
1434
1435 up_read(&hidp_session_sem);
1436 return err;
1437}
1438
1439int hidp_get_conninfo(struct hidp_conninfo *ci)
1440{
1441 struct hidp_session *session;
1442
1443 session = hidp_session_find(&ci->bdaddr);
1444 if (session) {
1445 hidp_copy_session(session, ci);
1446 hidp_session_put(session);
1447 }
1448
1449 return session ? 0 : -ENOENT;
1450}
1451
1452static int __init hidp_init(void)
1453{
1454 BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);
1455
1456 return hidp_init_sockets();
1457}
1458
1459static void __exit hidp_exit(void)
1460{
1461 hidp_cleanup_sockets();
1462}
1463
1464module_init(hidp_init);
1465module_exit(hidp_exit);
1466
1467MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1468MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
1469MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
1470MODULE_VERSION(VERSION);
1471MODULE_LICENSE("GPL");
1472MODULE_ALIAS("bt-proto-6");
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 memset(ci, 0, sizeof(*ci));
74 bacpy(&ci->bdaddr, &session->bdaddr);
75
76 ci->flags = session->flags;
77 ci->state = BT_CONNECTED;
78
79 if (session->input) {
80 ci->vendor = session->input->id.vendor;
81 ci->product = session->input->id.product;
82 ci->version = session->input->id.version;
83 if (session->input->name)
84 strlcpy(ci->name, session->input->name, 128);
85 else
86 strlcpy(ci->name, "HID Boot Device", 128);
87 } else if (session->hid) {
88 ci->vendor = session->hid->vendor;
89 ci->product = session->hid->product;
90 ci->version = session->hid->version;
91 strlcpy(ci->name, session->hid->name, 128);
92 }
93}
94
95/* assemble skb, queue message on @transmit and wake up the session thread */
96static int hidp_send_message(struct hidp_session *session, struct socket *sock,
97 struct sk_buff_head *transmit, unsigned char hdr,
98 const unsigned char *data, int size)
99{
100 struct sk_buff *skb;
101 struct sock *sk = sock->sk;
102
103 BT_DBG("session %p data %p size %d", session, data, size);
104
105 if (atomic_read(&session->terminate))
106 return -EIO;
107
108 skb = alloc_skb(size + 1, GFP_ATOMIC);
109 if (!skb) {
110 BT_ERR("Can't allocate memory for new frame");
111 return -ENOMEM;
112 }
113
114 *skb_put(skb, 1) = hdr;
115 if (data && size > 0)
116 memcpy(skb_put(skb, size), data, size);
117
118 skb_queue_tail(transmit, skb);
119 wake_up_interruptible(sk_sleep(sk));
120
121 return 0;
122}
123
124static int hidp_send_ctrl_message(struct hidp_session *session,
125 unsigned char hdr, const unsigned char *data,
126 int size)
127{
128 return hidp_send_message(session, session->ctrl_sock,
129 &session->ctrl_transmit, hdr, data, size);
130}
131
132static int hidp_send_intr_message(struct hidp_session *session,
133 unsigned char hdr, const unsigned char *data,
134 int size)
135{
136 return hidp_send_message(session, session->intr_sock,
137 &session->intr_transmit, hdr, data, size);
138}
139
140static int hidp_input_event(struct input_dev *dev, unsigned int type,
141 unsigned int code, int value)
142{
143 struct hidp_session *session = input_get_drvdata(dev);
144 unsigned char newleds;
145 unsigned char hdr, data[2];
146
147 BT_DBG("session %p type %d code %d value %d",
148 session, type, code, value);
149
150 if (type != EV_LED)
151 return -1;
152
153 newleds = (!!test_bit(LED_KANA, dev->led) << 3) |
154 (!!test_bit(LED_COMPOSE, dev->led) << 3) |
155 (!!test_bit(LED_SCROLLL, dev->led) << 2) |
156 (!!test_bit(LED_CAPSL, dev->led) << 1) |
157 (!!test_bit(LED_NUML, dev->led));
158
159 if (session->leds == newleds)
160 return 0;
161
162 session->leds = newleds;
163
164 hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
165 data[0] = 0x01;
166 data[1] = newleds;
167
168 return hidp_send_intr_message(session, hdr, data, 2);
169}
170
171static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb)
172{
173 struct input_dev *dev = session->input;
174 unsigned char *keys = session->keys;
175 unsigned char *udata = skb->data + 1;
176 signed char *sdata = skb->data + 1;
177 int i, size = skb->len - 1;
178
179 switch (skb->data[0]) {
180 case 0x01: /* Keyboard report */
181 for (i = 0; i < 8; i++)
182 input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1);
183
184 /* If all the key codes have been set to 0x01, it means
185 * too many keys were pressed at the same time. */
186 if (!memcmp(udata + 2, hidp_mkeyspat, 6))
187 break;
188
189 for (i = 2; i < 8; i++) {
190 if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) {
191 if (hidp_keycode[keys[i]])
192 input_report_key(dev, hidp_keycode[keys[i]], 0);
193 else
194 BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
195 }
196
197 if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) {
198 if (hidp_keycode[udata[i]])
199 input_report_key(dev, hidp_keycode[udata[i]], 1);
200 else
201 BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]);
202 }
203 }
204
205 memcpy(keys, udata, 8);
206 break;
207
208 case 0x02: /* Mouse report */
209 input_report_key(dev, BTN_LEFT, sdata[0] & 0x01);
210 input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02);
211 input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04);
212 input_report_key(dev, BTN_SIDE, sdata[0] & 0x08);
213 input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10);
214
215 input_report_rel(dev, REL_X, sdata[1]);
216 input_report_rel(dev, REL_Y, sdata[2]);
217
218 if (size > 3)
219 input_report_rel(dev, REL_WHEEL, sdata[3]);
220 break;
221 }
222
223 input_sync(dev);
224}
225
226static int hidp_get_raw_report(struct hid_device *hid,
227 unsigned char report_number,
228 unsigned char *data, size_t count,
229 unsigned char report_type)
230{
231 struct hidp_session *session = hid->driver_data;
232 struct sk_buff *skb;
233 size_t len;
234 int numbered_reports = hid->report_enum[report_type].numbered;
235 int ret;
236
237 if (atomic_read(&session->terminate))
238 return -EIO;
239
240 switch (report_type) {
241 case HID_FEATURE_REPORT:
242 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE;
243 break;
244 case HID_INPUT_REPORT:
245 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT;
246 break;
247 case HID_OUTPUT_REPORT:
248 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT;
249 break;
250 default:
251 return -EINVAL;
252 }
253
254 if (mutex_lock_interruptible(&session->report_mutex))
255 return -ERESTARTSYS;
256
257 /* Set up our wait, and send the report request to the device. */
258 session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK;
259 session->waiting_report_number = numbered_reports ? report_number : -1;
260 set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
261 data[0] = report_number;
262 ret = hidp_send_ctrl_message(session, report_type, data, 1);
263 if (ret)
264 goto err;
265
266 /* Wait for the return of the report. The returned report
267 gets put in session->report_return. */
268 while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
269 !atomic_read(&session->terminate)) {
270 int res;
271
272 res = wait_event_interruptible_timeout(session->report_queue,
273 !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)
274 || atomic_read(&session->terminate),
275 5*HZ);
276 if (res == 0) {
277 /* timeout */
278 ret = -EIO;
279 goto err;
280 }
281 if (res < 0) {
282 /* signal */
283 ret = -ERESTARTSYS;
284 goto err;
285 }
286 }
287
288 skb = session->report_return;
289 if (skb) {
290 len = skb->len < count ? skb->len : count;
291 memcpy(data, skb->data, len);
292
293 kfree_skb(skb);
294 session->report_return = NULL;
295 } else {
296 /* Device returned a HANDSHAKE, indicating protocol error. */
297 len = -EIO;
298 }
299
300 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
301 mutex_unlock(&session->report_mutex);
302
303 return len;
304
305err:
306 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
307 mutex_unlock(&session->report_mutex);
308 return ret;
309}
310
311static int hidp_set_raw_report(struct hid_device *hid, unsigned char reportnum,
312 unsigned char *data, size_t count,
313 unsigned char report_type)
314{
315 struct hidp_session *session = hid->driver_data;
316 int ret;
317
318 switch (report_type) {
319 case HID_FEATURE_REPORT:
320 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE;
321 break;
322 case HID_INPUT_REPORT:
323 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_INPUT;
324 break;
325 case HID_OUTPUT_REPORT:
326 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT;
327 break;
328 default:
329 return -EINVAL;
330 }
331
332 if (mutex_lock_interruptible(&session->report_mutex))
333 return -ERESTARTSYS;
334
335 /* Set up our wait, and send the report request to the device. */
336 data[0] = reportnum;
337 set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
338 ret = hidp_send_ctrl_message(session, report_type, data, count);
339 if (ret)
340 goto err;
341
342 /* Wait for the ACK from the device. */
343 while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) &&
344 !atomic_read(&session->terminate)) {
345 int res;
346
347 res = wait_event_interruptible_timeout(session->report_queue,
348 !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)
349 || atomic_read(&session->terminate),
350 10*HZ);
351 if (res == 0) {
352 /* timeout */
353 ret = -EIO;
354 goto err;
355 }
356 if (res < 0) {
357 /* signal */
358 ret = -ERESTARTSYS;
359 goto err;
360 }
361 }
362
363 if (!session->output_report_success) {
364 ret = -EIO;
365 goto err;
366 }
367
368 ret = count;
369
370err:
371 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
372 mutex_unlock(&session->report_mutex);
373 return ret;
374}
375
376static int hidp_output_report(struct hid_device *hid, __u8 *data, size_t count)
377{
378 struct hidp_session *session = hid->driver_data;
379
380 return hidp_send_intr_message(session,
381 HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT,
382 data, count);
383}
384
385static int hidp_raw_request(struct hid_device *hid, unsigned char reportnum,
386 __u8 *buf, size_t len, unsigned char rtype,
387 int reqtype)
388{
389 switch (reqtype) {
390 case HID_REQ_GET_REPORT:
391 return hidp_get_raw_report(hid, reportnum, buf, len, rtype);
392 case HID_REQ_SET_REPORT:
393 return hidp_set_raw_report(hid, reportnum, buf, len, rtype);
394 default:
395 return -EIO;
396 }
397}
398
399static void hidp_idle_timeout(unsigned long arg)
400{
401 struct hidp_session *session = (struct hidp_session *) arg;
402
403 hidp_session_terminate(session);
404}
405
406static void hidp_set_timer(struct hidp_session *session)
407{
408 if (session->idle_to > 0)
409 mod_timer(&session->timer, jiffies + HZ * session->idle_to);
410}
411
412static void hidp_del_timer(struct hidp_session *session)
413{
414 if (session->idle_to > 0)
415 del_timer(&session->timer);
416}
417
418static void hidp_process_report(struct hidp_session *session,
419 int type, const u8 *data, int len, int intr)
420{
421 if (len > HID_MAX_BUFFER_SIZE)
422 len = HID_MAX_BUFFER_SIZE;
423
424 memcpy(session->input_buf, data, len);
425 hid_input_report(session->hid, type, session->input_buf, len, intr);
426}
427
428static void hidp_process_handshake(struct hidp_session *session,
429 unsigned char param)
430{
431 BT_DBG("session %p param 0x%02x", session, param);
432 session->output_report_success = 0; /* default condition */
433
434 switch (param) {
435 case HIDP_HSHK_SUCCESSFUL:
436 /* FIXME: Call into SET_ GET_ handlers here */
437 session->output_report_success = 1;
438 break;
439
440 case HIDP_HSHK_NOT_READY:
441 case HIDP_HSHK_ERR_INVALID_REPORT_ID:
442 case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST:
443 case HIDP_HSHK_ERR_INVALID_PARAMETER:
444 if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags))
445 wake_up_interruptible(&session->report_queue);
446
447 /* FIXME: Call into SET_ GET_ handlers here */
448 break;
449
450 case HIDP_HSHK_ERR_UNKNOWN:
451 break;
452
453 case HIDP_HSHK_ERR_FATAL:
454 /* Device requests a reboot, as this is the only way this error
455 * can be recovered. */
456 hidp_send_ctrl_message(session,
457 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0);
458 break;
459
460 default:
461 hidp_send_ctrl_message(session,
462 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
463 break;
464 }
465
466 /* Wake up the waiting thread. */
467 if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags))
468 wake_up_interruptible(&session->report_queue);
469}
470
471static void hidp_process_hid_control(struct hidp_session *session,
472 unsigned char param)
473{
474 BT_DBG("session %p param 0x%02x", session, param);
475
476 if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) {
477 /* Flush the transmit queues */
478 skb_queue_purge(&session->ctrl_transmit);
479 skb_queue_purge(&session->intr_transmit);
480
481 hidp_session_terminate(session);
482 }
483}
484
485/* Returns true if the passed-in skb should be freed by the caller. */
486static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb,
487 unsigned char param)
488{
489 int done_with_skb = 1;
490 BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param);
491
492 switch (param) {
493 case HIDP_DATA_RTYPE_INPUT:
494 hidp_set_timer(session);
495
496 if (session->input)
497 hidp_input_report(session, skb);
498
499 if (session->hid)
500 hidp_process_report(session, HID_INPUT_REPORT,
501 skb->data, skb->len, 0);
502 break;
503
504 case HIDP_DATA_RTYPE_OTHER:
505 case HIDP_DATA_RTYPE_OUPUT:
506 case HIDP_DATA_RTYPE_FEATURE:
507 break;
508
509 default:
510 hidp_send_ctrl_message(session,
511 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
512 }
513
514 if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
515 param == session->waiting_report_type) {
516 if (session->waiting_report_number < 0 ||
517 session->waiting_report_number == skb->data[0]) {
518 /* hidp_get_raw_report() is waiting on this report. */
519 session->report_return = skb;
520 done_with_skb = 0;
521 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
522 wake_up_interruptible(&session->report_queue);
523 }
524 }
525
526 return done_with_skb;
527}
528
529static void hidp_recv_ctrl_frame(struct hidp_session *session,
530 struct sk_buff *skb)
531{
532 unsigned char hdr, type, param;
533 int free_skb = 1;
534
535 BT_DBG("session %p skb %p len %d", session, skb, skb->len);
536
537 hdr = skb->data[0];
538 skb_pull(skb, 1);
539
540 type = hdr & HIDP_HEADER_TRANS_MASK;
541 param = hdr & HIDP_HEADER_PARAM_MASK;
542
543 switch (type) {
544 case HIDP_TRANS_HANDSHAKE:
545 hidp_process_handshake(session, param);
546 break;
547
548 case HIDP_TRANS_HID_CONTROL:
549 hidp_process_hid_control(session, param);
550 break;
551
552 case HIDP_TRANS_DATA:
553 free_skb = hidp_process_data(session, skb, param);
554 break;
555
556 default:
557 hidp_send_ctrl_message(session,
558 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0);
559 break;
560 }
561
562 if (free_skb)
563 kfree_skb(skb);
564}
565
566static void hidp_recv_intr_frame(struct hidp_session *session,
567 struct sk_buff *skb)
568{
569 unsigned char hdr;
570
571 BT_DBG("session %p skb %p len %d", session, skb, skb->len);
572
573 hdr = skb->data[0];
574 skb_pull(skb, 1);
575
576 if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) {
577 hidp_set_timer(session);
578
579 if (session->input)
580 hidp_input_report(session, skb);
581
582 if (session->hid) {
583 hidp_process_report(session, HID_INPUT_REPORT,
584 skb->data, skb->len, 1);
585 BT_DBG("report len %d", skb->len);
586 }
587 } else {
588 BT_DBG("Unsupported protocol header 0x%02x", hdr);
589 }
590
591 kfree_skb(skb);
592}
593
594static int hidp_send_frame(struct socket *sock, unsigned char *data, int len)
595{
596 struct kvec iv = { data, len };
597 struct msghdr msg;
598
599 BT_DBG("sock %p data %p len %d", sock, data, len);
600
601 if (!len)
602 return 0;
603
604 memset(&msg, 0, sizeof(msg));
605
606 return kernel_sendmsg(sock, &msg, &iv, 1, len);
607}
608
609/* dequeue message from @transmit and send via @sock */
610static void hidp_process_transmit(struct hidp_session *session,
611 struct sk_buff_head *transmit,
612 struct socket *sock)
613{
614 struct sk_buff *skb;
615 int ret;
616
617 BT_DBG("session %p", session);
618
619 while ((skb = skb_dequeue(transmit))) {
620 ret = hidp_send_frame(sock, skb->data, skb->len);
621 if (ret == -EAGAIN) {
622 skb_queue_head(transmit, skb);
623 break;
624 } else if (ret < 0) {
625 hidp_session_terminate(session);
626 kfree_skb(skb);
627 break;
628 }
629
630 hidp_set_timer(session);
631 kfree_skb(skb);
632 }
633}
634
635static int hidp_setup_input(struct hidp_session *session,
636 struct hidp_connadd_req *req)
637{
638 struct input_dev *input;
639 int i;
640
641 input = input_allocate_device();
642 if (!input)
643 return -ENOMEM;
644
645 session->input = input;
646
647 input_set_drvdata(input, session);
648
649 input->name = "Bluetooth HID Boot Protocol Device";
650
651 input->id.bustype = BUS_BLUETOOTH;
652 input->id.vendor = req->vendor;
653 input->id.product = req->product;
654 input->id.version = req->version;
655
656 if (req->subclass & 0x40) {
657 set_bit(EV_KEY, input->evbit);
658 set_bit(EV_LED, input->evbit);
659 set_bit(EV_REP, input->evbit);
660
661 set_bit(LED_NUML, input->ledbit);
662 set_bit(LED_CAPSL, input->ledbit);
663 set_bit(LED_SCROLLL, input->ledbit);
664 set_bit(LED_COMPOSE, input->ledbit);
665 set_bit(LED_KANA, input->ledbit);
666
667 for (i = 0; i < sizeof(hidp_keycode); i++)
668 set_bit(hidp_keycode[i], input->keybit);
669 clear_bit(0, input->keybit);
670 }
671
672 if (req->subclass & 0x80) {
673 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
674 input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
675 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
676 input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
677 input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
678 BIT_MASK(BTN_EXTRA);
679 input->relbit[0] |= BIT_MASK(REL_WHEEL);
680 }
681
682 input->dev.parent = &session->conn->hcon->dev;
683
684 input->event = hidp_input_event;
685
686 return 0;
687}
688
689static int hidp_open(struct hid_device *hid)
690{
691 return 0;
692}
693
694static void hidp_close(struct hid_device *hid)
695{
696}
697
698static int hidp_parse(struct hid_device *hid)
699{
700 struct hidp_session *session = hid->driver_data;
701
702 return hid_parse_report(session->hid, session->rd_data,
703 session->rd_size);
704}
705
706static int hidp_start(struct hid_device *hid)
707{
708 return 0;
709}
710
711static void hidp_stop(struct hid_device *hid)
712{
713 struct hidp_session *session = hid->driver_data;
714
715 skb_queue_purge(&session->ctrl_transmit);
716 skb_queue_purge(&session->intr_transmit);
717
718 hid->claimed = 0;
719}
720
721static struct hid_ll_driver hidp_hid_driver = {
722 .parse = hidp_parse,
723 .start = hidp_start,
724 .stop = hidp_stop,
725 .open = hidp_open,
726 .close = hidp_close,
727 .raw_request = hidp_raw_request,
728 .output_report = hidp_output_report,
729};
730
731/* This function sets up the hid device. It does not add it
732 to the HID system. That is done in hidp_add_connection(). */
733static int hidp_setup_hid(struct hidp_session *session,
734 struct hidp_connadd_req *req)
735{
736 struct hid_device *hid;
737 int err;
738
739 session->rd_data = kzalloc(req->rd_size, GFP_KERNEL);
740 if (!session->rd_data)
741 return -ENOMEM;
742
743 if (copy_from_user(session->rd_data, req->rd_data, req->rd_size)) {
744 err = -EFAULT;
745 goto fault;
746 }
747 session->rd_size = req->rd_size;
748
749 hid = hid_allocate_device();
750 if (IS_ERR(hid)) {
751 err = PTR_ERR(hid);
752 goto fault;
753 }
754
755 session->hid = hid;
756
757 hid->driver_data = session;
758
759 hid->bus = BUS_BLUETOOTH;
760 hid->vendor = req->vendor;
761 hid->product = req->product;
762 hid->version = req->version;
763 hid->country = req->country;
764
765 strncpy(hid->name, req->name, sizeof(req->name) - 1);
766
767 snprintf(hid->phys, sizeof(hid->phys), "%pMR",
768 &l2cap_pi(session->ctrl_sock->sk)->chan->src);
769
770 /* NOTE: Some device modules depend on the dst address being stored in
771 * uniq. Please be aware of this before making changes to this behavior.
772 */
773 snprintf(hid->uniq, sizeof(hid->uniq), "%pMR",
774 &l2cap_pi(session->ctrl_sock->sk)->chan->dst);
775
776 hid->dev.parent = &session->conn->hcon->dev;
777 hid->ll_driver = &hidp_hid_driver;
778
779 /* True if device is blacklisted in drivers/hid/hid-core.c */
780 if (hid_ignore(hid)) {
781 hid_destroy_device(session->hid);
782 session->hid = NULL;
783 return -ENODEV;
784 }
785
786 return 0;
787
788fault:
789 kfree(session->rd_data);
790 session->rd_data = NULL;
791
792 return err;
793}
794
795/* initialize session devices */
796static int hidp_session_dev_init(struct hidp_session *session,
797 struct hidp_connadd_req *req)
798{
799 int ret;
800
801 if (req->rd_size > 0) {
802 ret = hidp_setup_hid(session, req);
803 if (ret && ret != -ENODEV)
804 return ret;
805 }
806
807 if (!session->hid) {
808 ret = hidp_setup_input(session, req);
809 if (ret < 0)
810 return ret;
811 }
812
813 return 0;
814}
815
816/* destroy session devices */
817static void hidp_session_dev_destroy(struct hidp_session *session)
818{
819 if (session->hid)
820 put_device(&session->hid->dev);
821 else if (session->input)
822 input_put_device(session->input);
823
824 kfree(session->rd_data);
825 session->rd_data = NULL;
826}
827
828/* add HID/input devices to their underlying bus systems */
829static int hidp_session_dev_add(struct hidp_session *session)
830{
831 int ret;
832
833 /* Both HID and input systems drop a ref-count when unregistering the
834 * device but they don't take a ref-count when registering them. Work
835 * around this by explicitly taking a refcount during registration
836 * which is dropped automatically by unregistering the devices. */
837
838 if (session->hid) {
839 ret = hid_add_device(session->hid);
840 if (ret)
841 return ret;
842 get_device(&session->hid->dev);
843 } else if (session->input) {
844 ret = input_register_device(session->input);
845 if (ret)
846 return ret;
847 input_get_device(session->input);
848 }
849
850 return 0;
851}
852
853/* remove HID/input devices from their bus systems */
854static void hidp_session_dev_del(struct hidp_session *session)
855{
856 if (session->hid)
857 hid_destroy_device(session->hid);
858 else if (session->input)
859 input_unregister_device(session->input);
860}
861
862/*
863 * Asynchronous device registration
864 * HID device drivers might want to perform I/O during initialization to
865 * detect device types. Therefore, call device registration in a separate
866 * worker so the HIDP thread can schedule I/O operations.
867 * Note that this must be called after the worker thread was initialized
868 * successfully. This will then add the devices and increase session state
869 * on success, otherwise it will terminate the session thread.
870 */
871static void hidp_session_dev_work(struct work_struct *work)
872{
873 struct hidp_session *session = container_of(work,
874 struct hidp_session,
875 dev_init);
876 int ret;
877
878 ret = hidp_session_dev_add(session);
879 if (!ret)
880 atomic_inc(&session->state);
881 else
882 hidp_session_terminate(session);
883}
884
885/*
886 * Create new session object
887 * Allocate session object, initialize static fields, copy input data into the
888 * object and take a reference to all sub-objects.
889 * This returns 0 on success and puts a pointer to the new session object in
890 * \out. Otherwise, an error code is returned.
891 * The new session object has an initial ref-count of 1.
892 */
893static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
894 struct socket *ctrl_sock,
895 struct socket *intr_sock,
896 struct hidp_connadd_req *req,
897 struct l2cap_conn *conn)
898{
899 struct hidp_session *session;
900 int ret;
901 struct bt_sock *ctrl, *intr;
902
903 ctrl = bt_sk(ctrl_sock->sk);
904 intr = bt_sk(intr_sock->sk);
905
906 session = kzalloc(sizeof(*session), GFP_KERNEL);
907 if (!session)
908 return -ENOMEM;
909
910 /* object and runtime management */
911 kref_init(&session->ref);
912 atomic_set(&session->state, HIDP_SESSION_IDLING);
913 init_waitqueue_head(&session->state_queue);
914 session->flags = req->flags & (1 << HIDP_BLUETOOTH_VENDOR_ID);
915
916 /* connection management */
917 bacpy(&session->bdaddr, bdaddr);
918 session->conn = conn;
919 session->user.probe = hidp_session_probe;
920 session->user.remove = hidp_session_remove;
921 session->ctrl_sock = ctrl_sock;
922 session->intr_sock = intr_sock;
923 skb_queue_head_init(&session->ctrl_transmit);
924 skb_queue_head_init(&session->intr_transmit);
925 session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu,
926 l2cap_pi(ctrl)->chan->imtu);
927 session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu,
928 l2cap_pi(intr)->chan->imtu);
929 session->idle_to = req->idle_to;
930
931 /* device management */
932 INIT_WORK(&session->dev_init, hidp_session_dev_work);
933 setup_timer(&session->timer, hidp_idle_timeout,
934 (unsigned long)session);
935
936 /* session data */
937 mutex_init(&session->report_mutex);
938 init_waitqueue_head(&session->report_queue);
939
940 ret = hidp_session_dev_init(session, req);
941 if (ret)
942 goto err_free;
943
944 l2cap_conn_get(session->conn);
945 get_file(session->intr_sock->file);
946 get_file(session->ctrl_sock->file);
947 *out = session;
948 return 0;
949
950err_free:
951 kfree(session);
952 return ret;
953}
954
955/* increase ref-count of the given session by one */
956static void hidp_session_get(struct hidp_session *session)
957{
958 kref_get(&session->ref);
959}
960
961/* release callback */
962static void session_free(struct kref *ref)
963{
964 struct hidp_session *session = container_of(ref, struct hidp_session,
965 ref);
966
967 hidp_session_dev_destroy(session);
968 skb_queue_purge(&session->ctrl_transmit);
969 skb_queue_purge(&session->intr_transmit);
970 fput(session->intr_sock->file);
971 fput(session->ctrl_sock->file);
972 l2cap_conn_put(session->conn);
973 kfree(session);
974}
975
976/* decrease ref-count of the given session by one */
977static void hidp_session_put(struct hidp_session *session)
978{
979 kref_put(&session->ref, session_free);
980}
981
982/*
983 * Search the list of active sessions for a session with target address
984 * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as
985 * you do not release this lock, the session objects cannot vanish and you can
986 * safely take a reference to the session yourself.
987 */
988static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr)
989{
990 struct hidp_session *session;
991
992 list_for_each_entry(session, &hidp_session_list, list) {
993 if (!bacmp(bdaddr, &session->bdaddr))
994 return session;
995 }
996
997 return NULL;
998}
999
1000/*
1001 * Same as __hidp_session_find() but no locks must be held. This also takes a
1002 * reference of the returned session (if non-NULL) so you must drop this
1003 * reference if you no longer use the object.
1004 */
1005static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr)
1006{
1007 struct hidp_session *session;
1008
1009 down_read(&hidp_session_sem);
1010
1011 session = __hidp_session_find(bdaddr);
1012 if (session)
1013 hidp_session_get(session);
1014
1015 up_read(&hidp_session_sem);
1016
1017 return session;
1018}
1019
1020/*
1021 * Start session synchronously
1022 * This starts a session thread and waits until initialization
1023 * is done or returns an error if it couldn't be started.
1024 * If this returns 0 the session thread is up and running. You must call
1025 * hipd_session_stop_sync() before deleting any runtime resources.
1026 */
1027static int hidp_session_start_sync(struct hidp_session *session)
1028{
1029 unsigned int vendor, product;
1030
1031 if (session->hid) {
1032 vendor = session->hid->vendor;
1033 product = session->hid->product;
1034 } else if (session->input) {
1035 vendor = session->input->id.vendor;
1036 product = session->input->id.product;
1037 } else {
1038 vendor = 0x0000;
1039 product = 0x0000;
1040 }
1041
1042 session->task = kthread_run(hidp_session_thread, session,
1043 "khidpd_%04x%04x", vendor, product);
1044 if (IS_ERR(session->task))
1045 return PTR_ERR(session->task);
1046
1047 while (atomic_read(&session->state) <= HIDP_SESSION_IDLING)
1048 wait_event(session->state_queue,
1049 atomic_read(&session->state) > HIDP_SESSION_IDLING);
1050
1051 return 0;
1052}
1053
1054/*
1055 * Terminate session thread
1056 * Wake up session thread and notify it to stop. This is asynchronous and
1057 * returns immediately. Call this whenever a runtime error occurs and you want
1058 * the session to stop.
1059 * Note: wake_up_process() performs any necessary memory-barriers for us.
1060 */
1061static void hidp_session_terminate(struct hidp_session *session)
1062{
1063 atomic_inc(&session->terminate);
1064 wake_up_process(session->task);
1065}
1066
1067/*
1068 * Probe HIDP session
1069 * This is called from the l2cap_conn core when our l2cap_user object is bound
1070 * to the hci-connection. We get the session via the \user object and can now
1071 * start the session thread, link it into the global session list and
1072 * schedule HID/input device registration.
1073 * The global session-list owns its own reference to the session object so you
1074 * can drop your own reference after registering the l2cap_user object.
1075 */
1076static int hidp_session_probe(struct l2cap_conn *conn,
1077 struct l2cap_user *user)
1078{
1079 struct hidp_session *session = container_of(user,
1080 struct hidp_session,
1081 user);
1082 struct hidp_session *s;
1083 int ret;
1084
1085 down_write(&hidp_session_sem);
1086
1087 /* check that no other session for this device exists */
1088 s = __hidp_session_find(&session->bdaddr);
1089 if (s) {
1090 ret = -EEXIST;
1091 goto out_unlock;
1092 }
1093
1094 if (session->input) {
1095 ret = hidp_session_dev_add(session);
1096 if (ret)
1097 goto out_unlock;
1098 }
1099
1100 ret = hidp_session_start_sync(session);
1101 if (ret)
1102 goto out_del;
1103
1104 /* HID device registration is async to allow I/O during probe */
1105 if (session->input)
1106 atomic_inc(&session->state);
1107 else
1108 schedule_work(&session->dev_init);
1109
1110 hidp_session_get(session);
1111 list_add(&session->list, &hidp_session_list);
1112 ret = 0;
1113 goto out_unlock;
1114
1115out_del:
1116 if (session->input)
1117 hidp_session_dev_del(session);
1118out_unlock:
1119 up_write(&hidp_session_sem);
1120 return ret;
1121}
1122
1123/*
1124 * Remove HIDP session
1125 * Called from the l2cap_conn core when either we explicitly unregistered
1126 * the l2cap_user object or if the underlying connection is shut down.
1127 * We signal the hidp-session thread to shut down, unregister the HID/input
1128 * devices and unlink the session from the global list.
1129 * This drops the reference to the session that is owned by the global
1130 * session-list.
1131 * Note: We _must_ not synchronosly wait for the session-thread to shut down.
1132 * This is, because the session-thread might be waiting for an HCI lock that is
1133 * held while we are called. Therefore, we only unregister the devices and
1134 * notify the session-thread to terminate. The thread itself owns a reference
1135 * to the session object so it can safely shut down.
1136 */
1137static void hidp_session_remove(struct l2cap_conn *conn,
1138 struct l2cap_user *user)
1139{
1140 struct hidp_session *session = container_of(user,
1141 struct hidp_session,
1142 user);
1143
1144 down_write(&hidp_session_sem);
1145
1146 hidp_session_terminate(session);
1147
1148 cancel_work_sync(&session->dev_init);
1149 if (session->input ||
1150 atomic_read(&session->state) > HIDP_SESSION_PREPARING)
1151 hidp_session_dev_del(session);
1152
1153 list_del(&session->list);
1154
1155 up_write(&hidp_session_sem);
1156
1157 hidp_session_put(session);
1158}
1159
1160/*
1161 * Session Worker
1162 * This performs the actual main-loop of the HIDP worker. We first check
1163 * whether the underlying connection is still alive, then parse all pending
1164 * messages and finally send all outstanding messages.
1165 */
1166static void hidp_session_run(struct hidp_session *session)
1167{
1168 struct sock *ctrl_sk = session->ctrl_sock->sk;
1169 struct sock *intr_sk = session->intr_sock->sk;
1170 struct sk_buff *skb;
1171
1172 for (;;) {
1173 /*
1174 * This thread can be woken up two ways:
1175 * - You call hidp_session_terminate() which sets the
1176 * session->terminate flag and wakes this thread up.
1177 * - Via modifying the socket state of ctrl/intr_sock. This
1178 * thread is woken up by ->sk_state_changed().
1179 *
1180 * Note: set_current_state() performs any necessary
1181 * memory-barriers for us.
1182 */
1183 set_current_state(TASK_INTERRUPTIBLE);
1184
1185 if (atomic_read(&session->terminate))
1186 break;
1187
1188 if (ctrl_sk->sk_state != BT_CONNECTED ||
1189 intr_sk->sk_state != BT_CONNECTED)
1190 break;
1191
1192 /* parse incoming intr-skbs */
1193 while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
1194 skb_orphan(skb);
1195 if (!skb_linearize(skb))
1196 hidp_recv_intr_frame(session, skb);
1197 else
1198 kfree_skb(skb);
1199 }
1200
1201 /* send pending intr-skbs */
1202 hidp_process_transmit(session, &session->intr_transmit,
1203 session->intr_sock);
1204
1205 /* parse incoming ctrl-skbs */
1206 while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
1207 skb_orphan(skb);
1208 if (!skb_linearize(skb))
1209 hidp_recv_ctrl_frame(session, skb);
1210 else
1211 kfree_skb(skb);
1212 }
1213
1214 /* send pending ctrl-skbs */
1215 hidp_process_transmit(session, &session->ctrl_transmit,
1216 session->ctrl_sock);
1217
1218 schedule();
1219 }
1220
1221 atomic_inc(&session->terminate);
1222 set_current_state(TASK_RUNNING);
1223}
1224
1225/*
1226 * HIDP session thread
1227 * This thread runs the I/O for a single HIDP session. Startup is synchronous
1228 * which allows us to take references to ourself here instead of doing that in
1229 * the caller.
1230 * When we are ready to run we notify the caller and call hidp_session_run().
1231 */
1232static int hidp_session_thread(void *arg)
1233{
1234 struct hidp_session *session = arg;
1235 wait_queue_t ctrl_wait, intr_wait;
1236
1237 BT_DBG("session %p", session);
1238
1239 /* initialize runtime environment */
1240 hidp_session_get(session);
1241 __module_get(THIS_MODULE);
1242 set_user_nice(current, -15);
1243 hidp_set_timer(session);
1244
1245 init_waitqueue_entry(&ctrl_wait, current);
1246 init_waitqueue_entry(&intr_wait, current);
1247 add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait);
1248 add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1249 /* This memory barrier is paired with wq_has_sleeper(). See
1250 * sock_poll_wait() for more information why this is needed. */
1251 smp_mb();
1252
1253 /* notify synchronous startup that we're ready */
1254 atomic_inc(&session->state);
1255 wake_up(&session->state_queue);
1256
1257 /* run session */
1258 hidp_session_run(session);
1259
1260 /* cleanup runtime environment */
1261 remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1262 remove_wait_queue(sk_sleep(session->intr_sock->sk), &ctrl_wait);
1263 wake_up_interruptible(&session->report_queue);
1264 hidp_del_timer(session);
1265
1266 /*
1267 * If we stopped ourself due to any internal signal, we should try to
1268 * unregister our own session here to avoid having it linger until the
1269 * parent l2cap_conn dies or user-space cleans it up.
1270 * This does not deadlock as we don't do any synchronous shutdown.
1271 * Instead, this call has the same semantics as if user-space tried to
1272 * delete the session.
1273 */
1274 l2cap_unregister_user(session->conn, &session->user);
1275 hidp_session_put(session);
1276
1277 module_put_and_exit(0);
1278 return 0;
1279}
1280
1281static int hidp_verify_sockets(struct socket *ctrl_sock,
1282 struct socket *intr_sock)
1283{
1284 struct l2cap_chan *ctrl_chan, *intr_chan;
1285 struct bt_sock *ctrl, *intr;
1286 struct hidp_session *session;
1287
1288 if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock))
1289 return -EINVAL;
1290
1291 ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan;
1292 intr_chan = l2cap_pi(intr_sock->sk)->chan;
1293
1294 if (bacmp(&ctrl_chan->src, &intr_chan->src) ||
1295 bacmp(&ctrl_chan->dst, &intr_chan->dst))
1296 return -ENOTUNIQ;
1297
1298 ctrl = bt_sk(ctrl_sock->sk);
1299 intr = bt_sk(intr_sock->sk);
1300
1301 if (ctrl->sk.sk_state != BT_CONNECTED ||
1302 intr->sk.sk_state != BT_CONNECTED)
1303 return -EBADFD;
1304
1305 /* early session check, we check again during session registration */
1306 session = hidp_session_find(&ctrl_chan->dst);
1307 if (session) {
1308 hidp_session_put(session);
1309 return -EEXIST;
1310 }
1311
1312 return 0;
1313}
1314
1315int hidp_connection_add(struct hidp_connadd_req *req,
1316 struct socket *ctrl_sock,
1317 struct socket *intr_sock)
1318{
1319 struct hidp_session *session;
1320 struct l2cap_conn *conn;
1321 struct l2cap_chan *chan = l2cap_pi(ctrl_sock->sk)->chan;
1322 int ret;
1323
1324 ret = hidp_verify_sockets(ctrl_sock, intr_sock);
1325 if (ret)
1326 return ret;
1327
1328 conn = NULL;
1329 l2cap_chan_lock(chan);
1330 if (chan->conn) {
1331 l2cap_conn_get(chan->conn);
1332 conn = chan->conn;
1333 }
1334 l2cap_chan_unlock(chan);
1335
1336 if (!conn)
1337 return -EBADFD;
1338
1339 ret = hidp_session_new(&session, &chan->dst, ctrl_sock,
1340 intr_sock, req, conn);
1341 if (ret)
1342 goto out_conn;
1343
1344 ret = l2cap_register_user(conn, &session->user);
1345 if (ret)
1346 goto out_session;
1347
1348 ret = 0;
1349
1350out_session:
1351 hidp_session_put(session);
1352out_conn:
1353 l2cap_conn_put(conn);
1354 return ret;
1355}
1356
1357int hidp_connection_del(struct hidp_conndel_req *req)
1358{
1359 struct hidp_session *session;
1360
1361 session = hidp_session_find(&req->bdaddr);
1362 if (!session)
1363 return -ENOENT;
1364
1365 if (req->flags & (1 << HIDP_VIRTUAL_CABLE_UNPLUG))
1366 hidp_send_ctrl_message(session,
1367 HIDP_TRANS_HID_CONTROL |
1368 HIDP_CTRL_VIRTUAL_CABLE_UNPLUG,
1369 NULL, 0);
1370 else
1371 l2cap_unregister_user(session->conn, &session->user);
1372
1373 hidp_session_put(session);
1374
1375 return 0;
1376}
1377
1378int hidp_get_connlist(struct hidp_connlist_req *req)
1379{
1380 struct hidp_session *session;
1381 int err = 0, n = 0;
1382
1383 BT_DBG("");
1384
1385 down_read(&hidp_session_sem);
1386
1387 list_for_each_entry(session, &hidp_session_list, list) {
1388 struct hidp_conninfo ci;
1389
1390 hidp_copy_session(session, &ci);
1391
1392 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
1393 err = -EFAULT;
1394 break;
1395 }
1396
1397 if (++n >= req->cnum)
1398 break;
1399
1400 req->ci++;
1401 }
1402 req->cnum = n;
1403
1404 up_read(&hidp_session_sem);
1405 return err;
1406}
1407
1408int hidp_get_conninfo(struct hidp_conninfo *ci)
1409{
1410 struct hidp_session *session;
1411
1412 session = hidp_session_find(&ci->bdaddr);
1413 if (session) {
1414 hidp_copy_session(session, ci);
1415 hidp_session_put(session);
1416 }
1417
1418 return session ? 0 : -ENOENT;
1419}
1420
1421static int __init hidp_init(void)
1422{
1423 BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);
1424
1425 return hidp_init_sockets();
1426}
1427
1428static void __exit hidp_exit(void)
1429{
1430 hidp_cleanup_sockets();
1431}
1432
1433module_init(hidp_init);
1434module_exit(hidp_exit);
1435
1436MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1437MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
1438MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
1439MODULE_VERSION(VERSION);
1440MODULE_LICENSE("GPL");
1441MODULE_ALIAS("bt-proto-6");