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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 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");
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 int ret;
105
106 BT_DBG("session %p data %p size %d", session, data, size);
107
108 if (atomic_read(&session->terminate))
109 return -EIO;
110
111 skb = alloc_skb(size + 1, GFP_ATOMIC);
112 if (!skb) {
113 BT_ERR("Can't allocate memory for new frame");
114 return -ENOMEM;
115 }
116
117 skb_put_u8(skb, hdr);
118 if (data && size > 0) {
119 skb_put_data(skb, data, size);
120 ret = size;
121 } else {
122 ret = 0;
123 }
124
125 skb_queue_tail(transmit, skb);
126 wake_up_interruptible(sk_sleep(sk));
127
128 return ret;
129}
130
131static int hidp_send_ctrl_message(struct hidp_session *session,
132 unsigned char hdr, const unsigned char *data,
133 int size)
134{
135 return hidp_send_message(session, session->ctrl_sock,
136 &session->ctrl_transmit, hdr, data, size);
137}
138
139static int hidp_send_intr_message(struct hidp_session *session,
140 unsigned char hdr, const unsigned char *data,
141 int size)
142{
143 return hidp_send_message(session, session->intr_sock,
144 &session->intr_transmit, hdr, data, size);
145}
146
147static int hidp_input_event(struct input_dev *dev, unsigned int type,
148 unsigned int code, int value)
149{
150 struct hidp_session *session = input_get_drvdata(dev);
151 unsigned char newleds;
152 unsigned char hdr, data[2];
153
154 BT_DBG("session %p type %d code %d value %d",
155 session, type, code, value);
156
157 if (type != EV_LED)
158 return -1;
159
160 newleds = (!!test_bit(LED_KANA, dev->led) << 3) |
161 (!!test_bit(LED_COMPOSE, dev->led) << 3) |
162 (!!test_bit(LED_SCROLLL, dev->led) << 2) |
163 (!!test_bit(LED_CAPSL, dev->led) << 1) |
164 (!!test_bit(LED_NUML, dev->led) << 0);
165
166 if (session->leds == newleds)
167 return 0;
168
169 session->leds = newleds;
170
171 hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
172 data[0] = 0x01;
173 data[1] = newleds;
174
175 return hidp_send_intr_message(session, hdr, data, 2);
176}
177
178static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb)
179{
180 struct input_dev *dev = session->input;
181 unsigned char *keys = session->keys;
182 unsigned char *udata = skb->data + 1;
183 signed char *sdata = skb->data + 1;
184 int i, size = skb->len - 1;
185
186 switch (skb->data[0]) {
187 case 0x01: /* Keyboard report */
188 for (i = 0; i < 8; i++)
189 input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1);
190
191 /* If all the key codes have been set to 0x01, it means
192 * too many keys were pressed at the same time. */
193 if (!memcmp(udata + 2, hidp_mkeyspat, 6))
194 break;
195
196 for (i = 2; i < 8; i++) {
197 if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) {
198 if (hidp_keycode[keys[i]])
199 input_report_key(dev, hidp_keycode[keys[i]], 0);
200 else
201 BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
202 }
203
204 if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) {
205 if (hidp_keycode[udata[i]])
206 input_report_key(dev, hidp_keycode[udata[i]], 1);
207 else
208 BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]);
209 }
210 }
211
212 memcpy(keys, udata, 8);
213 break;
214
215 case 0x02: /* Mouse report */
216 input_report_key(dev, BTN_LEFT, sdata[0] & 0x01);
217 input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02);
218 input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04);
219 input_report_key(dev, BTN_SIDE, sdata[0] & 0x08);
220 input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10);
221
222 input_report_rel(dev, REL_X, sdata[1]);
223 input_report_rel(dev, REL_Y, sdata[2]);
224
225 if (size > 3)
226 input_report_rel(dev, REL_WHEEL, sdata[3]);
227 break;
228 }
229
230 input_sync(dev);
231}
232
233static int hidp_get_raw_report(struct hid_device *hid,
234 unsigned char report_number,
235 unsigned char *data, size_t count,
236 unsigned char report_type)
237{
238 struct hidp_session *session = hid->driver_data;
239 struct sk_buff *skb;
240 size_t len;
241 int numbered_reports = hid->report_enum[report_type].numbered;
242 int ret;
243
244 if (atomic_read(&session->terminate))
245 return -EIO;
246
247 switch (report_type) {
248 case HID_FEATURE_REPORT:
249 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE;
250 break;
251 case HID_INPUT_REPORT:
252 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT;
253 break;
254 case HID_OUTPUT_REPORT:
255 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT;
256 break;
257 default:
258 return -EINVAL;
259 }
260
261 if (mutex_lock_interruptible(&session->report_mutex))
262 return -ERESTARTSYS;
263
264 /* Set up our wait, and send the report request to the device. */
265 session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK;
266 session->waiting_report_number = numbered_reports ? report_number : -1;
267 set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
268 data[0] = report_number;
269 ret = hidp_send_ctrl_message(session, report_type, data, 1);
270 if (ret < 0)
271 goto err;
272
273 /* Wait for the return of the report. The returned report
274 gets put in session->report_return. */
275 while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
276 !atomic_read(&session->terminate)) {
277 int res;
278
279 res = wait_event_interruptible_timeout(session->report_queue,
280 !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)
281 || atomic_read(&session->terminate),
282 5*HZ);
283 if (res == 0) {
284 /* timeout */
285 ret = -EIO;
286 goto err;
287 }
288 if (res < 0) {
289 /* signal */
290 ret = -ERESTARTSYS;
291 goto err;
292 }
293 }
294
295 skb = session->report_return;
296 if (skb) {
297 len = skb->len < count ? skb->len : count;
298 memcpy(data, skb->data, len);
299
300 kfree_skb(skb);
301 session->report_return = NULL;
302 } else {
303 /* Device returned a HANDSHAKE, indicating protocol error. */
304 len = -EIO;
305 }
306
307 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
308 mutex_unlock(&session->report_mutex);
309
310 return len;
311
312err:
313 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
314 mutex_unlock(&session->report_mutex);
315 return ret;
316}
317
318static int hidp_set_raw_report(struct hid_device *hid, unsigned char reportnum,
319 unsigned char *data, size_t count,
320 unsigned char report_type)
321{
322 struct hidp_session *session = hid->driver_data;
323 int ret;
324
325 switch (report_type) {
326 case HID_FEATURE_REPORT:
327 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE;
328 break;
329 case HID_INPUT_REPORT:
330 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_INPUT;
331 break;
332 case HID_OUTPUT_REPORT:
333 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT;
334 break;
335 default:
336 return -EINVAL;
337 }
338
339 if (mutex_lock_interruptible(&session->report_mutex))
340 return -ERESTARTSYS;
341
342 /* Set up our wait, and send the report request to the device. */
343 data[0] = reportnum;
344 set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
345 ret = hidp_send_ctrl_message(session, report_type, data, count);
346 if (ret < 0)
347 goto err;
348
349 /* Wait for the ACK from the device. */
350 while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) &&
351 !atomic_read(&session->terminate)) {
352 int res;
353
354 res = wait_event_interruptible_timeout(session->report_queue,
355 !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)
356 || atomic_read(&session->terminate),
357 10*HZ);
358 if (res == 0) {
359 /* timeout */
360 ret = -EIO;
361 goto err;
362 }
363 if (res < 0) {
364 /* signal */
365 ret = -ERESTARTSYS;
366 goto err;
367 }
368 }
369
370 if (!session->output_report_success) {
371 ret = -EIO;
372 goto err;
373 }
374
375 ret = count;
376
377err:
378 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
379 mutex_unlock(&session->report_mutex);
380 return ret;
381}
382
383static int hidp_output_report(struct hid_device *hid, __u8 *data, size_t count)
384{
385 struct hidp_session *session = hid->driver_data;
386
387 return hidp_send_intr_message(session,
388 HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT,
389 data, count);
390}
391
392static int hidp_raw_request(struct hid_device *hid, unsigned char reportnum,
393 __u8 *buf, size_t len, unsigned char rtype,
394 int reqtype)
395{
396 switch (reqtype) {
397 case HID_REQ_GET_REPORT:
398 return hidp_get_raw_report(hid, reportnum, buf, len, rtype);
399 case HID_REQ_SET_REPORT:
400 return hidp_set_raw_report(hid, reportnum, buf, len, rtype);
401 default:
402 return -EIO;
403 }
404}
405
406static void hidp_idle_timeout(struct timer_list *t)
407{
408 struct hidp_session *session = from_timer(session, t, timer);
409
410 /* The HIDP user-space API only contains calls to add and remove
411 * devices. There is no way to forward events of any kind. Therefore,
412 * we have to forcefully disconnect a device on idle-timeouts. This is
413 * unfortunate and weird API design, but it is spec-compliant and
414 * required for backwards-compatibility. Hence, on idle-timeout, we
415 * signal driver-detach events, so poll() will be woken up with an
416 * error-condition on both sockets.
417 */
418
419 session->intr_sock->sk->sk_err = EUNATCH;
420 session->ctrl_sock->sk->sk_err = EUNATCH;
421 wake_up_interruptible(sk_sleep(session->intr_sock->sk));
422 wake_up_interruptible(sk_sleep(session->ctrl_sock->sk));
423
424 hidp_session_terminate(session);
425}
426
427static void hidp_set_timer(struct hidp_session *session)
428{
429 if (session->idle_to > 0)
430 mod_timer(&session->timer, jiffies + HZ * session->idle_to);
431}
432
433static void hidp_del_timer(struct hidp_session *session)
434{
435 if (session->idle_to > 0)
436 del_timer(&session->timer);
437}
438
439static void hidp_process_report(struct hidp_session *session, int type,
440 const u8 *data, unsigned int len, int intr)
441{
442 if (len > HID_MAX_BUFFER_SIZE)
443 len = HID_MAX_BUFFER_SIZE;
444
445 memcpy(session->input_buf, data, len);
446 hid_input_report(session->hid, type, session->input_buf, len, intr);
447}
448
449static void hidp_process_handshake(struct hidp_session *session,
450 unsigned char param)
451{
452 BT_DBG("session %p param 0x%02x", session, param);
453 session->output_report_success = 0; /* default condition */
454
455 switch (param) {
456 case HIDP_HSHK_SUCCESSFUL:
457 /* FIXME: Call into SET_ GET_ handlers here */
458 session->output_report_success = 1;
459 break;
460
461 case HIDP_HSHK_NOT_READY:
462 case HIDP_HSHK_ERR_INVALID_REPORT_ID:
463 case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST:
464 case HIDP_HSHK_ERR_INVALID_PARAMETER:
465 if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags))
466 wake_up_interruptible(&session->report_queue);
467
468 /* FIXME: Call into SET_ GET_ handlers here */
469 break;
470
471 case HIDP_HSHK_ERR_UNKNOWN:
472 break;
473
474 case HIDP_HSHK_ERR_FATAL:
475 /* Device requests a reboot, as this is the only way this error
476 * can be recovered. */
477 hidp_send_ctrl_message(session,
478 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0);
479 break;
480
481 default:
482 hidp_send_ctrl_message(session,
483 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
484 break;
485 }
486
487 /* Wake up the waiting thread. */
488 if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags))
489 wake_up_interruptible(&session->report_queue);
490}
491
492static void hidp_process_hid_control(struct hidp_session *session,
493 unsigned char param)
494{
495 BT_DBG("session %p param 0x%02x", session, param);
496
497 if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) {
498 /* Flush the transmit queues */
499 skb_queue_purge(&session->ctrl_transmit);
500 skb_queue_purge(&session->intr_transmit);
501
502 hidp_session_terminate(session);
503 }
504}
505
506/* Returns true if the passed-in skb should be freed by the caller. */
507static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb,
508 unsigned char param)
509{
510 int done_with_skb = 1;
511 BT_DBG("session %p skb %p len %u param 0x%02x", session, skb, skb->len, param);
512
513 switch (param) {
514 case HIDP_DATA_RTYPE_INPUT:
515 hidp_set_timer(session);
516
517 if (session->input)
518 hidp_input_report(session, skb);
519
520 if (session->hid)
521 hidp_process_report(session, HID_INPUT_REPORT,
522 skb->data, skb->len, 0);
523 break;
524
525 case HIDP_DATA_RTYPE_OTHER:
526 case HIDP_DATA_RTYPE_OUPUT:
527 case HIDP_DATA_RTYPE_FEATURE:
528 break;
529
530 default:
531 hidp_send_ctrl_message(session,
532 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
533 }
534
535 if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
536 param == session->waiting_report_type) {
537 if (session->waiting_report_number < 0 ||
538 session->waiting_report_number == skb->data[0]) {
539 /* hidp_get_raw_report() is waiting on this report. */
540 session->report_return = skb;
541 done_with_skb = 0;
542 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
543 wake_up_interruptible(&session->report_queue);
544 }
545 }
546
547 return done_with_skb;
548}
549
550static void hidp_recv_ctrl_frame(struct hidp_session *session,
551 struct sk_buff *skb)
552{
553 unsigned char hdr, type, param;
554 int free_skb = 1;
555
556 BT_DBG("session %p skb %p len %u", session, skb, skb->len);
557
558 hdr = skb->data[0];
559 skb_pull(skb, 1);
560
561 type = hdr & HIDP_HEADER_TRANS_MASK;
562 param = hdr & HIDP_HEADER_PARAM_MASK;
563
564 switch (type) {
565 case HIDP_TRANS_HANDSHAKE:
566 hidp_process_handshake(session, param);
567 break;
568
569 case HIDP_TRANS_HID_CONTROL:
570 hidp_process_hid_control(session, param);
571 break;
572
573 case HIDP_TRANS_DATA:
574 free_skb = hidp_process_data(session, skb, param);
575 break;
576
577 default:
578 hidp_send_ctrl_message(session,
579 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0);
580 break;
581 }
582
583 if (free_skb)
584 kfree_skb(skb);
585}
586
587static void hidp_recv_intr_frame(struct hidp_session *session,
588 struct sk_buff *skb)
589{
590 unsigned char hdr;
591
592 BT_DBG("session %p skb %p len %u", session, skb, skb->len);
593
594 hdr = skb->data[0];
595 skb_pull(skb, 1);
596
597 if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) {
598 hidp_set_timer(session);
599
600 if (session->input)
601 hidp_input_report(session, skb);
602
603 if (session->hid) {
604 hidp_process_report(session, HID_INPUT_REPORT,
605 skb->data, skb->len, 1);
606 BT_DBG("report len %d", skb->len);
607 }
608 } else {
609 BT_DBG("Unsupported protocol header 0x%02x", hdr);
610 }
611
612 kfree_skb(skb);
613}
614
615static int hidp_send_frame(struct socket *sock, unsigned char *data, int len)
616{
617 struct kvec iv = { data, len };
618 struct msghdr msg;
619
620 BT_DBG("sock %p data %p len %d", sock, data, len);
621
622 if (!len)
623 return 0;
624
625 memset(&msg, 0, sizeof(msg));
626
627 return kernel_sendmsg(sock, &msg, &iv, 1, len);
628}
629
630/* dequeue message from @transmit and send via @sock */
631static void hidp_process_transmit(struct hidp_session *session,
632 struct sk_buff_head *transmit,
633 struct socket *sock)
634{
635 struct sk_buff *skb;
636 int ret;
637
638 BT_DBG("session %p", session);
639
640 while ((skb = skb_dequeue(transmit))) {
641 ret = hidp_send_frame(sock, skb->data, skb->len);
642 if (ret == -EAGAIN) {
643 skb_queue_head(transmit, skb);
644 break;
645 } else if (ret < 0) {
646 hidp_session_terminate(session);
647 kfree_skb(skb);
648 break;
649 }
650
651 hidp_set_timer(session);
652 kfree_skb(skb);
653 }
654}
655
656static int hidp_setup_input(struct hidp_session *session,
657 const struct hidp_connadd_req *req)
658{
659 struct input_dev *input;
660 int i;
661
662 input = input_allocate_device();
663 if (!input)
664 return -ENOMEM;
665
666 session->input = input;
667
668 input_set_drvdata(input, session);
669
670 input->name = "Bluetooth HID Boot Protocol Device";
671
672 input->id.bustype = BUS_BLUETOOTH;
673 input->id.vendor = req->vendor;
674 input->id.product = req->product;
675 input->id.version = req->version;
676
677 if (req->subclass & 0x40) {
678 set_bit(EV_KEY, input->evbit);
679 set_bit(EV_LED, input->evbit);
680 set_bit(EV_REP, input->evbit);
681
682 set_bit(LED_NUML, input->ledbit);
683 set_bit(LED_CAPSL, input->ledbit);
684 set_bit(LED_SCROLLL, input->ledbit);
685 set_bit(LED_COMPOSE, input->ledbit);
686 set_bit(LED_KANA, input->ledbit);
687
688 for (i = 0; i < sizeof(hidp_keycode); i++)
689 set_bit(hidp_keycode[i], input->keybit);
690 clear_bit(0, input->keybit);
691 }
692
693 if (req->subclass & 0x80) {
694 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
695 input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
696 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
697 input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
698 input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
699 BIT_MASK(BTN_EXTRA);
700 input->relbit[0] |= BIT_MASK(REL_WHEEL);
701 }
702
703 input->dev.parent = &session->conn->hcon->dev;
704
705 input->event = hidp_input_event;
706
707 return 0;
708}
709
710static int hidp_open(struct hid_device *hid)
711{
712 return 0;
713}
714
715static void hidp_close(struct hid_device *hid)
716{
717}
718
719static int hidp_parse(struct hid_device *hid)
720{
721 struct hidp_session *session = hid->driver_data;
722
723 return hid_parse_report(session->hid, session->rd_data,
724 session->rd_size);
725}
726
727static int hidp_start(struct hid_device *hid)
728{
729 return 0;
730}
731
732static void hidp_stop(struct hid_device *hid)
733{
734 struct hidp_session *session = hid->driver_data;
735
736 skb_queue_purge(&session->ctrl_transmit);
737 skb_queue_purge(&session->intr_transmit);
738
739 hid->claimed = 0;
740}
741
742struct hid_ll_driver hidp_hid_driver = {
743 .parse = hidp_parse,
744 .start = hidp_start,
745 .stop = hidp_stop,
746 .open = hidp_open,
747 .close = hidp_close,
748 .raw_request = hidp_raw_request,
749 .output_report = hidp_output_report,
750};
751EXPORT_SYMBOL_GPL(hidp_hid_driver);
752
753/* This function sets up the hid device. It does not add it
754 to the HID system. That is done in hidp_add_connection(). */
755static int hidp_setup_hid(struct hidp_session *session,
756 const struct hidp_connadd_req *req)
757{
758 struct hid_device *hid;
759 int err;
760
761 session->rd_data = memdup_user(req->rd_data, req->rd_size);
762 if (IS_ERR(session->rd_data))
763 return PTR_ERR(session->rd_data);
764
765 session->rd_size = req->rd_size;
766
767 hid = hid_allocate_device();
768 if (IS_ERR(hid)) {
769 err = PTR_ERR(hid);
770 goto fault;
771 }
772
773 session->hid = hid;
774
775 hid->driver_data = session;
776
777 hid->bus = BUS_BLUETOOTH;
778 hid->vendor = req->vendor;
779 hid->product = req->product;
780 hid->version = req->version;
781 hid->country = req->country;
782
783 strscpy(hid->name, req->name, sizeof(hid->name));
784
785 snprintf(hid->phys, sizeof(hid->phys), "%pMR",
786 &l2cap_pi(session->ctrl_sock->sk)->chan->src);
787
788 /* NOTE: Some device modules depend on the dst address being stored in
789 * uniq. Please be aware of this before making changes to this behavior.
790 */
791 snprintf(hid->uniq, sizeof(hid->uniq), "%pMR",
792 &l2cap_pi(session->ctrl_sock->sk)->chan->dst);
793
794 hid->dev.parent = &session->conn->hcon->dev;
795 hid->ll_driver = &hidp_hid_driver;
796
797 /* True if device is blocked in drivers/hid/hid-quirks.c */
798 if (hid_ignore(hid)) {
799 hid_destroy_device(session->hid);
800 session->hid = NULL;
801 return -ENODEV;
802 }
803
804 return 0;
805
806fault:
807 kfree(session->rd_data);
808 session->rd_data = NULL;
809
810 return err;
811}
812
813/* initialize session devices */
814static int hidp_session_dev_init(struct hidp_session *session,
815 const struct hidp_connadd_req *req)
816{
817 int ret;
818
819 if (req->rd_size > 0) {
820 ret = hidp_setup_hid(session, req);
821 if (ret && ret != -ENODEV)
822 return ret;
823 }
824
825 if (!session->hid) {
826 ret = hidp_setup_input(session, req);
827 if (ret < 0)
828 return ret;
829 }
830
831 return 0;
832}
833
834/* destroy session devices */
835static void hidp_session_dev_destroy(struct hidp_session *session)
836{
837 if (session->hid)
838 put_device(&session->hid->dev);
839 else if (session->input)
840 input_put_device(session->input);
841
842 kfree(session->rd_data);
843 session->rd_data = NULL;
844}
845
846/* add HID/input devices to their underlying bus systems */
847static int hidp_session_dev_add(struct hidp_session *session)
848{
849 int ret;
850
851 /* Both HID and input systems drop a ref-count when unregistering the
852 * device but they don't take a ref-count when registering them. Work
853 * around this by explicitly taking a refcount during registration
854 * which is dropped automatically by unregistering the devices. */
855
856 if (session->hid) {
857 ret = hid_add_device(session->hid);
858 if (ret)
859 return ret;
860 get_device(&session->hid->dev);
861 } else if (session->input) {
862 ret = input_register_device(session->input);
863 if (ret)
864 return ret;
865 input_get_device(session->input);
866 }
867
868 return 0;
869}
870
871/* remove HID/input devices from their bus systems */
872static void hidp_session_dev_del(struct hidp_session *session)
873{
874 if (session->hid)
875 hid_destroy_device(session->hid);
876 else if (session->input)
877 input_unregister_device(session->input);
878}
879
880/*
881 * Asynchronous device registration
882 * HID device drivers might want to perform I/O during initialization to
883 * detect device types. Therefore, call device registration in a separate
884 * worker so the HIDP thread can schedule I/O operations.
885 * Note that this must be called after the worker thread was initialized
886 * successfully. This will then add the devices and increase session state
887 * on success, otherwise it will terminate the session thread.
888 */
889static void hidp_session_dev_work(struct work_struct *work)
890{
891 struct hidp_session *session = container_of(work,
892 struct hidp_session,
893 dev_init);
894 int ret;
895
896 ret = hidp_session_dev_add(session);
897 if (!ret)
898 atomic_inc(&session->state);
899 else
900 hidp_session_terminate(session);
901}
902
903/*
904 * Create new session object
905 * Allocate session object, initialize static fields, copy input data into the
906 * object and take a reference to all sub-objects.
907 * This returns 0 on success and puts a pointer to the new session object in
908 * \out. Otherwise, an error code is returned.
909 * The new session object has an initial ref-count of 1.
910 */
911static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
912 struct socket *ctrl_sock,
913 struct socket *intr_sock,
914 const struct hidp_connadd_req *req,
915 struct l2cap_conn *conn)
916{
917 struct hidp_session *session;
918 int ret;
919 struct bt_sock *ctrl, *intr;
920
921 ctrl = bt_sk(ctrl_sock->sk);
922 intr = bt_sk(intr_sock->sk);
923
924 session = kzalloc(sizeof(*session), GFP_KERNEL);
925 if (!session)
926 return -ENOMEM;
927
928 /* object and runtime management */
929 kref_init(&session->ref);
930 atomic_set(&session->state, HIDP_SESSION_IDLING);
931 init_waitqueue_head(&session->state_queue);
932 session->flags = req->flags & BIT(HIDP_BLUETOOTH_VENDOR_ID);
933
934 /* connection management */
935 bacpy(&session->bdaddr, bdaddr);
936 session->conn = l2cap_conn_get(conn);
937 session->user.probe = hidp_session_probe;
938 session->user.remove = hidp_session_remove;
939 INIT_LIST_HEAD(&session->user.list);
940 session->ctrl_sock = ctrl_sock;
941 session->intr_sock = intr_sock;
942 skb_queue_head_init(&session->ctrl_transmit);
943 skb_queue_head_init(&session->intr_transmit);
944 session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu,
945 l2cap_pi(ctrl)->chan->imtu);
946 session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu,
947 l2cap_pi(intr)->chan->imtu);
948 session->idle_to = req->idle_to;
949
950 /* device management */
951 INIT_WORK(&session->dev_init, hidp_session_dev_work);
952 timer_setup(&session->timer, hidp_idle_timeout, 0);
953
954 /* session data */
955 mutex_init(&session->report_mutex);
956 init_waitqueue_head(&session->report_queue);
957
958 ret = hidp_session_dev_init(session, req);
959 if (ret)
960 goto err_free;
961
962 get_file(session->intr_sock->file);
963 get_file(session->ctrl_sock->file);
964 *out = session;
965 return 0;
966
967err_free:
968 l2cap_conn_put(session->conn);
969 kfree(session);
970 return ret;
971}
972
973/* increase ref-count of the given session by one */
974static void hidp_session_get(struct hidp_session *session)
975{
976 kref_get(&session->ref);
977}
978
979/* release callback */
980static void session_free(struct kref *ref)
981{
982 struct hidp_session *session = container_of(ref, struct hidp_session,
983 ref);
984
985 hidp_session_dev_destroy(session);
986 skb_queue_purge(&session->ctrl_transmit);
987 skb_queue_purge(&session->intr_transmit);
988 fput(session->intr_sock->file);
989 fput(session->ctrl_sock->file);
990 l2cap_conn_put(session->conn);
991 kfree(session);
992}
993
994/* decrease ref-count of the given session by one */
995static void hidp_session_put(struct hidp_session *session)
996{
997 kref_put(&session->ref, session_free);
998}
999
1000/*
1001 * Search the list of active sessions for a session with target address
1002 * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as
1003 * you do not release this lock, the session objects cannot vanish and you can
1004 * safely take a reference to the session yourself.
1005 */
1006static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr)
1007{
1008 struct hidp_session *session;
1009
1010 list_for_each_entry(session, &hidp_session_list, list) {
1011 if (!bacmp(bdaddr, &session->bdaddr))
1012 return session;
1013 }
1014
1015 return NULL;
1016}
1017
1018/*
1019 * Same as __hidp_session_find() but no locks must be held. This also takes a
1020 * reference of the returned session (if non-NULL) so you must drop this
1021 * reference if you no longer use the object.
1022 */
1023static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr)
1024{
1025 struct hidp_session *session;
1026
1027 down_read(&hidp_session_sem);
1028
1029 session = __hidp_session_find(bdaddr);
1030 if (session)
1031 hidp_session_get(session);
1032
1033 up_read(&hidp_session_sem);
1034
1035 return session;
1036}
1037
1038/*
1039 * Start session synchronously
1040 * This starts a session thread and waits until initialization
1041 * is done or returns an error if it couldn't be started.
1042 * If this returns 0 the session thread is up and running. You must call
1043 * hipd_session_stop_sync() before deleting any runtime resources.
1044 */
1045static int hidp_session_start_sync(struct hidp_session *session)
1046{
1047 unsigned int vendor, product;
1048
1049 if (session->hid) {
1050 vendor = session->hid->vendor;
1051 product = session->hid->product;
1052 } else if (session->input) {
1053 vendor = session->input->id.vendor;
1054 product = session->input->id.product;
1055 } else {
1056 vendor = 0x0000;
1057 product = 0x0000;
1058 }
1059
1060 session->task = kthread_run(hidp_session_thread, session,
1061 "khidpd_%04x%04x", vendor, product);
1062 if (IS_ERR(session->task))
1063 return PTR_ERR(session->task);
1064
1065 while (atomic_read(&session->state) <= HIDP_SESSION_IDLING)
1066 wait_event(session->state_queue,
1067 atomic_read(&session->state) > HIDP_SESSION_IDLING);
1068
1069 return 0;
1070}
1071
1072/*
1073 * Terminate session thread
1074 * Wake up session thread and notify it to stop. This is asynchronous and
1075 * returns immediately. Call this whenever a runtime error occurs and you want
1076 * the session to stop.
1077 * Note: wake_up_interruptible() performs any necessary memory-barriers for us.
1078 */
1079static void hidp_session_terminate(struct hidp_session *session)
1080{
1081 atomic_inc(&session->terminate);
1082 /*
1083 * See the comment preceding the call to wait_woken()
1084 * in hidp_session_run().
1085 */
1086 wake_up_interruptible(&hidp_session_wq);
1087}
1088
1089/*
1090 * Probe HIDP session
1091 * This is called from the l2cap_conn core when our l2cap_user object is bound
1092 * to the hci-connection. We get the session via the \user object and can now
1093 * start the session thread, link it into the global session list and
1094 * schedule HID/input device registration.
1095 * The global session-list owns its own reference to the session object so you
1096 * can drop your own reference after registering the l2cap_user object.
1097 */
1098static int hidp_session_probe(struct l2cap_conn *conn,
1099 struct l2cap_user *user)
1100{
1101 struct hidp_session *session = container_of(user,
1102 struct hidp_session,
1103 user);
1104 struct hidp_session *s;
1105 int ret;
1106
1107 down_write(&hidp_session_sem);
1108
1109 /* check that no other session for this device exists */
1110 s = __hidp_session_find(&session->bdaddr);
1111 if (s) {
1112 ret = -EEXIST;
1113 goto out_unlock;
1114 }
1115
1116 if (session->input) {
1117 ret = hidp_session_dev_add(session);
1118 if (ret)
1119 goto out_unlock;
1120 }
1121
1122 ret = hidp_session_start_sync(session);
1123 if (ret)
1124 goto out_del;
1125
1126 /* HID device registration is async to allow I/O during probe */
1127 if (session->input)
1128 atomic_inc(&session->state);
1129 else
1130 schedule_work(&session->dev_init);
1131
1132 hidp_session_get(session);
1133 list_add(&session->list, &hidp_session_list);
1134 ret = 0;
1135 goto out_unlock;
1136
1137out_del:
1138 if (session->input)
1139 hidp_session_dev_del(session);
1140out_unlock:
1141 up_write(&hidp_session_sem);
1142 return ret;
1143}
1144
1145/*
1146 * Remove HIDP session
1147 * Called from the l2cap_conn core when either we explicitly unregistered
1148 * the l2cap_user object or if the underlying connection is shut down.
1149 * We signal the hidp-session thread to shut down, unregister the HID/input
1150 * devices and unlink the session from the global list.
1151 * This drops the reference to the session that is owned by the global
1152 * session-list.
1153 * Note: We _must_ not synchronosly wait for the session-thread to shut down.
1154 * This is, because the session-thread might be waiting for an HCI lock that is
1155 * held while we are called. Therefore, we only unregister the devices and
1156 * notify the session-thread to terminate. The thread itself owns a reference
1157 * to the session object so it can safely shut down.
1158 */
1159static void hidp_session_remove(struct l2cap_conn *conn,
1160 struct l2cap_user *user)
1161{
1162 struct hidp_session *session = container_of(user,
1163 struct hidp_session,
1164 user);
1165
1166 down_write(&hidp_session_sem);
1167
1168 hidp_session_terminate(session);
1169
1170 cancel_work_sync(&session->dev_init);
1171 if (session->input ||
1172 atomic_read(&session->state) > HIDP_SESSION_PREPARING)
1173 hidp_session_dev_del(session);
1174
1175 list_del(&session->list);
1176
1177 up_write(&hidp_session_sem);
1178
1179 hidp_session_put(session);
1180}
1181
1182/*
1183 * Session Worker
1184 * This performs the actual main-loop of the HIDP worker. We first check
1185 * whether the underlying connection is still alive, then parse all pending
1186 * messages and finally send all outstanding messages.
1187 */
1188static void hidp_session_run(struct hidp_session *session)
1189{
1190 struct sock *ctrl_sk = session->ctrl_sock->sk;
1191 struct sock *intr_sk = session->intr_sock->sk;
1192 struct sk_buff *skb;
1193 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1194
1195 add_wait_queue(&hidp_session_wq, &wait);
1196 for (;;) {
1197 /*
1198 * This thread can be woken up two ways:
1199 * - You call hidp_session_terminate() which sets the
1200 * session->terminate flag and wakes this thread up.
1201 * - Via modifying the socket state of ctrl/intr_sock. This
1202 * thread is woken up by ->sk_state_changed().
1203 */
1204
1205 if (atomic_read(&session->terminate))
1206 break;
1207
1208 if (ctrl_sk->sk_state != BT_CONNECTED ||
1209 intr_sk->sk_state != BT_CONNECTED)
1210 break;
1211
1212 /* parse incoming intr-skbs */
1213 while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
1214 skb_orphan(skb);
1215 if (!skb_linearize(skb))
1216 hidp_recv_intr_frame(session, skb);
1217 else
1218 kfree_skb(skb);
1219 }
1220
1221 /* send pending intr-skbs */
1222 hidp_process_transmit(session, &session->intr_transmit,
1223 session->intr_sock);
1224
1225 /* parse incoming ctrl-skbs */
1226 while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
1227 skb_orphan(skb);
1228 if (!skb_linearize(skb))
1229 hidp_recv_ctrl_frame(session, skb);
1230 else
1231 kfree_skb(skb);
1232 }
1233
1234 /* send pending ctrl-skbs */
1235 hidp_process_transmit(session, &session->ctrl_transmit,
1236 session->ctrl_sock);
1237
1238 /*
1239 * wait_woken() performs the necessary memory barriers
1240 * for us; see the header comment for this primitive.
1241 */
1242 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
1243 }
1244 remove_wait_queue(&hidp_session_wq, &wait);
1245
1246 atomic_inc(&session->terminate);
1247}
1248
1249static int hidp_session_wake_function(wait_queue_entry_t *wait,
1250 unsigned int mode,
1251 int sync, void *key)
1252{
1253 wake_up_interruptible(&hidp_session_wq);
1254 return false;
1255}
1256
1257/*
1258 * HIDP session thread
1259 * This thread runs the I/O for a single HIDP session. Startup is synchronous
1260 * which allows us to take references to ourself here instead of doing that in
1261 * the caller.
1262 * When we are ready to run we notify the caller and call hidp_session_run().
1263 */
1264static int hidp_session_thread(void *arg)
1265{
1266 struct hidp_session *session = arg;
1267 DEFINE_WAIT_FUNC(ctrl_wait, hidp_session_wake_function);
1268 DEFINE_WAIT_FUNC(intr_wait, hidp_session_wake_function);
1269
1270 BT_DBG("session %p", session);
1271
1272 /* initialize runtime environment */
1273 hidp_session_get(session);
1274 __module_get(THIS_MODULE);
1275 set_user_nice(current, -15);
1276 hidp_set_timer(session);
1277
1278 add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait);
1279 add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1280 /* This memory barrier is paired with wq_has_sleeper(). See
1281 * sock_poll_wait() for more information why this is needed. */
1282 smp_mb__before_atomic();
1283
1284 /* notify synchronous startup that we're ready */
1285 atomic_inc(&session->state);
1286 wake_up(&session->state_queue);
1287
1288 /* run session */
1289 hidp_session_run(session);
1290
1291 /* cleanup runtime environment */
1292 remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1293 remove_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait);
1294 wake_up_interruptible(&session->report_queue);
1295 hidp_del_timer(session);
1296
1297 /*
1298 * If we stopped ourself due to any internal signal, we should try to
1299 * unregister our own session here to avoid having it linger until the
1300 * parent l2cap_conn dies or user-space cleans it up.
1301 * This does not deadlock as we don't do any synchronous shutdown.
1302 * Instead, this call has the same semantics as if user-space tried to
1303 * delete the session.
1304 */
1305 l2cap_unregister_user(session->conn, &session->user);
1306 hidp_session_put(session);
1307
1308 module_put_and_exit(0);
1309 return 0;
1310}
1311
1312static int hidp_verify_sockets(struct socket *ctrl_sock,
1313 struct socket *intr_sock)
1314{
1315 struct l2cap_chan *ctrl_chan, *intr_chan;
1316 struct bt_sock *ctrl, *intr;
1317 struct hidp_session *session;
1318
1319 if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock))
1320 return -EINVAL;
1321
1322 ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan;
1323 intr_chan = l2cap_pi(intr_sock->sk)->chan;
1324
1325 if (bacmp(&ctrl_chan->src, &intr_chan->src) ||
1326 bacmp(&ctrl_chan->dst, &intr_chan->dst))
1327 return -ENOTUNIQ;
1328
1329 ctrl = bt_sk(ctrl_sock->sk);
1330 intr = bt_sk(intr_sock->sk);
1331
1332 if (ctrl->sk.sk_state != BT_CONNECTED ||
1333 intr->sk.sk_state != BT_CONNECTED)
1334 return -EBADFD;
1335
1336 /* early session check, we check again during session registration */
1337 session = hidp_session_find(&ctrl_chan->dst);
1338 if (session) {
1339 hidp_session_put(session);
1340 return -EEXIST;
1341 }
1342
1343 return 0;
1344}
1345
1346int hidp_connection_add(const struct hidp_connadd_req *req,
1347 struct socket *ctrl_sock,
1348 struct socket *intr_sock)
1349{
1350 u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG) |
1351 BIT(HIDP_BOOT_PROTOCOL_MODE);
1352 struct hidp_session *session;
1353 struct l2cap_conn *conn;
1354 struct l2cap_chan *chan;
1355 int ret;
1356
1357 ret = hidp_verify_sockets(ctrl_sock, intr_sock);
1358 if (ret)
1359 return ret;
1360
1361 if (req->flags & ~valid_flags)
1362 return -EINVAL;
1363
1364 chan = l2cap_pi(ctrl_sock->sk)->chan;
1365 conn = NULL;
1366 l2cap_chan_lock(chan);
1367 if (chan->conn)
1368 conn = l2cap_conn_get(chan->conn);
1369 l2cap_chan_unlock(chan);
1370
1371 if (!conn)
1372 return -EBADFD;
1373
1374 ret = hidp_session_new(&session, &chan->dst, ctrl_sock,
1375 intr_sock, req, conn);
1376 if (ret)
1377 goto out_conn;
1378
1379 ret = l2cap_register_user(conn, &session->user);
1380 if (ret)
1381 goto out_session;
1382
1383 ret = 0;
1384
1385out_session:
1386 hidp_session_put(session);
1387out_conn:
1388 l2cap_conn_put(conn);
1389 return ret;
1390}
1391
1392int hidp_connection_del(struct hidp_conndel_req *req)
1393{
1394 u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG);
1395 struct hidp_session *session;
1396
1397 if (req->flags & ~valid_flags)
1398 return -EINVAL;
1399
1400 session = hidp_session_find(&req->bdaddr);
1401 if (!session)
1402 return -ENOENT;
1403
1404 if (req->flags & BIT(HIDP_VIRTUAL_CABLE_UNPLUG))
1405 hidp_send_ctrl_message(session,
1406 HIDP_TRANS_HID_CONTROL |
1407 HIDP_CTRL_VIRTUAL_CABLE_UNPLUG,
1408 NULL, 0);
1409 else
1410 l2cap_unregister_user(session->conn, &session->user);
1411
1412 hidp_session_put(session);
1413
1414 return 0;
1415}
1416
1417int hidp_get_connlist(struct hidp_connlist_req *req)
1418{
1419 struct hidp_session *session;
1420 int err = 0, n = 0;
1421
1422 BT_DBG("");
1423
1424 down_read(&hidp_session_sem);
1425
1426 list_for_each_entry(session, &hidp_session_list, list) {
1427 struct hidp_conninfo ci;
1428
1429 hidp_copy_session(session, &ci);
1430
1431 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
1432 err = -EFAULT;
1433 break;
1434 }
1435
1436 if (++n >= req->cnum)
1437 break;
1438
1439 req->ci++;
1440 }
1441 req->cnum = n;
1442
1443 up_read(&hidp_session_sem);
1444 return err;
1445}
1446
1447int hidp_get_conninfo(struct hidp_conninfo *ci)
1448{
1449 struct hidp_session *session;
1450
1451 session = hidp_session_find(&ci->bdaddr);
1452 if (session) {
1453 hidp_copy_session(session, ci);
1454 hidp_session_put(session);
1455 }
1456
1457 return session ? 0 : -ENOENT;
1458}
1459
1460static int __init hidp_init(void)
1461{
1462 BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);
1463
1464 return hidp_init_sockets();
1465}
1466
1467static void __exit hidp_exit(void)
1468{
1469 hidp_cleanup_sockets();
1470}
1471
1472module_init(hidp_init);
1473module_exit(hidp_exit);
1474
1475MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1476MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
1477MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
1478MODULE_VERSION(VERSION);
1479MODULE_LICENSE("GPL");
1480MODULE_ALIAS("bt-proto-6");