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