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(dst: &ci->bdaddr, src: &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 strscpy(ci->name, session->input->name, 128);
87 else
88 strscpy(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 strscpy(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(v: &session->terminate))
109 return -EIO;
110
111 skb = alloc_skb(size: 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, val: hdr);
118 if (data && size > 0) {
119 skb_put_data(skb, data, len: size);
120 ret = size;
121 } else {
122 ret = 0;
123 }
124
125 skb_queue_tail(list: transmit, newsk: 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, sock: session->ctrl_sock,
136 transmit: &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, sock: session->intr_sock,
144 transmit: &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, size: 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, code: hidp_keycode[i + 224], value: (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(p: udata + 2, q: hidp_mkeyspat, size: 6))
194 break;
195
196 for (i = 2; i < 8; i++) {
197 if (keys[i] > 3 && memscan(p: udata + 2, c: keys[i], size: 6) == udata + 8) {
198 if (hidp_keycode[keys[i]])
199 input_report_key(dev, code: hidp_keycode[keys[i]], value: 0);
200 else
201 BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
202 }
203
204 if (udata[i] > 3 && memscan(p: keys + 2, c: udata[i], size: 6) == keys + 8) {
205 if (hidp_keycode[udata[i]])
206 input_report_key(dev, code: hidp_keycode[udata[i]], value: 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, value: sdata[0] & 0x01);
217 input_report_key(dev, BTN_RIGHT, value: sdata[0] & 0x02);
218 input_report_key(dev, BTN_MIDDLE, value: sdata[0] & 0x04);
219 input_report_key(dev, BTN_SIDE, value: sdata[0] & 0x08);
220 input_report_key(dev, BTN_EXTRA, value: sdata[0] & 0x10);
221
222 input_report_rel(dev, REL_X, value: sdata[1]);
223 input_report_rel(dev, REL_Y, value: sdata[2]);
224
225 if (size > 3)
226 input_report_rel(dev, REL_WHEEL, value: 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(v: &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, addr: &session->flags);
268 data[0] = report_number;
269 ret = hidp_send_ctrl_message(session, hdr: report_type, data, size: 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(v: &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, addr: &session->flags);
308 mutex_unlock(lock: &session->report_mutex);
309
310 return len;
311
312err:
313 clear_bit(HIDP_WAITING_FOR_RETURN, addr: &session->flags);
314 mutex_unlock(lock: &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, addr: &session->flags);
345 ret = hidp_send_ctrl_message(session, hdr: report_type, data, size: 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(v: &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, addr: &session->flags);
379 mutex_unlock(lock: &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, size: 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, report_number: reportnum, data: buf, count: len, report_type: rtype);
399 case HID_REQ_SET_REPORT:
400 return hidp_set_raw_report(hid, reportnum, data: buf, count: len, report_type: rtype);
401 default:
402 return -EIO;
403 }
404}
405
406static void hidp_idle_timeout(struct timer_list *t)
407{
408 struct hidp_session *session = timer_container_of(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(s: session);
425}
426
427static void hidp_set_timer(struct hidp_session *session)
428{
429 if (session->idle_to > 0)
430 mod_timer(timer: &session->timer, expires: jiffies + HZ * session->idle_to);
431}
432
433static void hidp_del_timer(struct hidp_session *session)
434{
435 if (session->idle_to > 0)
436 timer_delete_sync(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(hid: session->hid, type, data: session->input_buf, size: len, interrupt: 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, addr: &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, size: 0);
479 break;
480
481 default:
482 hidp_send_ctrl_message(session,
483 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, size: 0);
484 break;
485 }
486
487 /* Wake up the waiting thread. */
488 if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, addr: &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(list: &session->ctrl_transmit);
500 skb_queue_purge(list: &session->intr_transmit);
501
502 hidp_session_terminate(s: 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, type: HID_INPUT_REPORT,
522 data: skb->data, len: skb->len, intr: 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, size: 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, addr: &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, len: 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, size: 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, len: 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, type: HID_INPUT_REPORT,
605 data: skb->data, len: skb->len, intr: 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: &msg, vec: &iv, num: 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(list: transmit))) {
641 ret = hidp_send_frame(sock, data: skb->data, len: skb->len);
642 if (ret == -EAGAIN) {
643 skb_queue_head(list: transmit, newsk: skb);
644 break;
645 } else if (ret < 0) {
646 hidp_session_terminate(s: 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(dev: input, data: 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, addr: input->evbit);
679 set_bit(EV_LED, addr: input->evbit);
680 set_bit(EV_REP, addr: input->evbit);
681
682 set_bit(LED_NUML, addr: input->ledbit);
683 set_bit(LED_CAPSL, addr: input->ledbit);
684 set_bit(LED_SCROLLL, addr: input->ledbit);
685 set_bit(LED_COMPOSE, addr: input->ledbit);
686 set_bit(LED_KANA, addr: input->ledbit);
687
688 for (i = 0; i < sizeof(hidp_keycode); i++)
689 set_bit(nr: hidp_keycode[i], addr: input->keybit);
690 clear_bit(nr: 0, addr: 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(hid: session->hid, start: session->rd_data,
724 size: 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(list: &session->ctrl_transmit);
737 skb_queue_purge(list: &session->intr_transmit);
738
739 hid->claimed = 0;
740}
741
742static const struct 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};
751
752/* This function sets up the hid device. It does not add it
753 to the HID system. That is done in hidp_add_connection(). */
754static int hidp_setup_hid(struct hidp_session *session,
755 const struct hidp_connadd_req *req)
756{
757 struct hid_device *hid;
758 int err;
759
760 session->rd_data = memdup_user(req->rd_data, req->rd_size);
761 if (IS_ERR(ptr: session->rd_data))
762 return PTR_ERR(ptr: session->rd_data);
763
764 session->rd_size = req->rd_size;
765
766 hid = hid_allocate_device();
767 if (IS_ERR(ptr: hid)) {
768 err = PTR_ERR(ptr: hid);
769 goto fault;
770 }
771
772 session->hid = hid;
773
774 hid->driver_data = session;
775
776 hid->bus = BUS_BLUETOOTH;
777 hid->vendor = req->vendor;
778 hid->product = req->product;
779 hid->version = req->version;
780 hid->country = req->country;
781
782 strscpy(hid->name, req->name, sizeof(hid->name));
783
784 snprintf(buf: hid->phys, size: sizeof(hid->phys), fmt: "%pMR",
785 &l2cap_pi(session->ctrl_sock->sk)->chan->src);
786
787 /* NOTE: Some device modules depend on the dst address being stored in
788 * uniq. Please be aware of this before making changes to this behavior.
789 */
790 snprintf(buf: hid->uniq, size: sizeof(hid->uniq), fmt: "%pMR",
791 &l2cap_pi(session->ctrl_sock->sk)->chan->dst);
792
793 hid->dev.parent = &session->conn->hcon->dev;
794 hid->ll_driver = &hidp_hid_driver;
795
796 /* True if device is blocked in drivers/hid/hid-quirks.c */
797 if (hid_ignore(hid)) {
798 hid_destroy_device(session->hid);
799 session->hid = NULL;
800 return -ENODEV;
801 }
802
803 return 0;
804
805fault:
806 kfree(objp: session->rd_data);
807 session->rd_data = NULL;
808
809 return err;
810}
811
812/* initialize session devices */
813static int hidp_session_dev_init(struct hidp_session *session,
814 const struct hidp_connadd_req *req)
815{
816 int ret;
817
818 if (req->rd_size > 0) {
819 ret = hidp_setup_hid(session, req);
820 if (ret && ret != -ENODEV)
821 return ret;
822 }
823
824 if (!session->hid) {
825 ret = hidp_setup_input(session, req);
826 if (ret < 0)
827 return ret;
828 }
829
830 return 0;
831}
832
833/* destroy session devices */
834static void hidp_session_dev_destroy(struct hidp_session *session)
835{
836 if (session->hid)
837 put_device(dev: &session->hid->dev);
838 else if (session->input)
839 input_put_device(dev: session->input);
840
841 kfree(objp: session->rd_data);
842 session->rd_data = NULL;
843}
844
845/* add HID/input devices to their underlying bus systems */
846static int hidp_session_dev_add(struct hidp_session *session)
847{
848 int ret;
849
850 /* Both HID and input systems drop a ref-count when unregistering the
851 * device but they don't take a ref-count when registering them. Work
852 * around this by explicitly taking a refcount during registration
853 * which is dropped automatically by unregistering the devices. */
854
855 if (session->hid) {
856 ret = hid_add_device(session->hid);
857 if (ret)
858 return ret;
859 get_device(dev: &session->hid->dev);
860 } else if (session->input) {
861 ret = input_register_device(session->input);
862 if (ret)
863 return ret;
864 input_get_device(dev: session->input);
865 }
866
867 return 0;
868}
869
870/* remove HID/input devices from their bus systems */
871static void hidp_session_dev_del(struct hidp_session *session)
872{
873 if (session->hid)
874 hid_destroy_device(session->hid);
875 else if (session->input)
876 input_unregister_device(session->input);
877}
878
879/*
880 * Asynchronous device registration
881 * HID device drivers might want to perform I/O during initialization to
882 * detect device types. Therefore, call device registration in a separate
883 * worker so the HIDP thread can schedule I/O operations.
884 * Note that this must be called after the worker thread was initialized
885 * successfully. This will then add the devices and increase session state
886 * on success, otherwise it will terminate the session thread.
887 */
888static void hidp_session_dev_work(struct work_struct *work)
889{
890 struct hidp_session *session = container_of(work,
891 struct hidp_session,
892 dev_init);
893 int ret;
894
895 ret = hidp_session_dev_add(session);
896 if (!ret)
897 atomic_inc(v: &session->state);
898 else
899 hidp_session_terminate(s: session);
900}
901
902/*
903 * Create new session object
904 * Allocate session object, initialize static fields, copy input data into the
905 * object and take a reference to all sub-objects.
906 * This returns 0 on success and puts a pointer to the new session object in
907 * \out. Otherwise, an error code is returned.
908 * The new session object has an initial ref-count of 1.
909 */
910static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
911 struct socket *ctrl_sock,
912 struct socket *intr_sock,
913 const struct hidp_connadd_req *req,
914 struct l2cap_conn *conn)
915{
916 struct hidp_session *session;
917 int ret;
918 struct bt_sock *ctrl, *intr;
919
920 ctrl = bt_sk(ctrl_sock->sk);
921 intr = bt_sk(intr_sock->sk);
922
923 session = kzalloc(sizeof(*session), GFP_KERNEL);
924 if (!session)
925 return -ENOMEM;
926
927 /* object and runtime management */
928 kref_init(kref: &session->ref);
929 atomic_set(v: &session->state, i: HIDP_SESSION_IDLING);
930 init_waitqueue_head(&session->state_queue);
931 session->flags = req->flags & BIT(HIDP_BLUETOOTH_VENDOR_ID);
932
933 /* connection management */
934 bacpy(dst: &session->bdaddr, src: bdaddr);
935 session->conn = l2cap_conn_get(conn);
936 session->user.probe = hidp_session_probe;
937 session->user.remove = hidp_session_remove;
938 INIT_LIST_HEAD(list: &session->user.list);
939 session->ctrl_sock = ctrl_sock;
940 session->intr_sock = intr_sock;
941 skb_queue_head_init(list: &session->ctrl_transmit);
942 skb_queue_head_init(list: &session->intr_transmit);
943 session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu,
944 l2cap_pi(ctrl)->chan->imtu);
945 session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu,
946 l2cap_pi(intr)->chan->imtu);
947 session->idle_to = req->idle_to;
948
949 /* device management */
950 INIT_WORK(&session->dev_init, hidp_session_dev_work);
951 timer_setup(&session->timer, hidp_idle_timeout, 0);
952
953 /* session data */
954 mutex_init(&session->report_mutex);
955 init_waitqueue_head(&session->report_queue);
956
957 ret = hidp_session_dev_init(session, req);
958 if (ret)
959 goto err_free;
960
961 get_file(f: session->intr_sock->file);
962 get_file(f: session->ctrl_sock->file);
963 *out = session;
964 return 0;
965
966err_free:
967 l2cap_conn_put(conn: session->conn);
968 kfree(objp: session);
969 return ret;
970}
971
972/* increase ref-count of the given session by one */
973static void hidp_session_get(struct hidp_session *session)
974{
975 kref_get(kref: &session->ref);
976}
977
978/* release callback */
979static void session_free(struct kref *ref)
980{
981 struct hidp_session *session = container_of(ref, struct hidp_session,
982 ref);
983
984 hidp_session_dev_destroy(session);
985 skb_queue_purge(list: &session->ctrl_transmit);
986 skb_queue_purge(list: &session->intr_transmit);
987 fput(session->intr_sock->file);
988 fput(session->ctrl_sock->file);
989 l2cap_conn_put(conn: session->conn);
990 kfree(objp: session);
991}
992
993/* decrease ref-count of the given session by one */
994static void hidp_session_put(struct hidp_session *session)
995{
996 kref_put(kref: &session->ref, release: session_free);
997}
998
999/*
1000 * Search the list of active sessions for a session with target address
1001 * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as
1002 * you do not release this lock, the session objects cannot vanish and you can
1003 * safely take a reference to the session yourself.
1004 */
1005static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr)
1006{
1007 struct hidp_session *session;
1008
1009 list_for_each_entry(session, &hidp_session_list, list) {
1010 if (!bacmp(ba1: bdaddr, ba2: &session->bdaddr))
1011 return session;
1012 }
1013
1014 return NULL;
1015}
1016
1017/*
1018 * Same as __hidp_session_find() but no locks must be held. This also takes a
1019 * reference of the returned session (if non-NULL) so you must drop this
1020 * reference if you no longer use the object.
1021 */
1022static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr)
1023{
1024 struct hidp_session *session;
1025
1026 down_read(sem: &hidp_session_sem);
1027
1028 session = __hidp_session_find(bdaddr);
1029 if (session)
1030 hidp_session_get(session);
1031
1032 up_read(sem: &hidp_session_sem);
1033
1034 return session;
1035}
1036
1037/*
1038 * Start session synchronously
1039 * This starts a session thread and waits until initialization
1040 * is done or returns an error if it couldn't be started.
1041 * If this returns 0 the session thread is up and running. You must call
1042 * hipd_session_stop_sync() before deleting any runtime resources.
1043 */
1044static int hidp_session_start_sync(struct hidp_session *session)
1045{
1046 unsigned int vendor, product;
1047
1048 if (session->hid) {
1049 vendor = session->hid->vendor;
1050 product = session->hid->product;
1051 } else if (session->input) {
1052 vendor = session->input->id.vendor;
1053 product = session->input->id.product;
1054 } else {
1055 vendor = 0x0000;
1056 product = 0x0000;
1057 }
1058
1059 session->task = kthread_run(hidp_session_thread, session,
1060 "khidpd_%04x%04x", vendor, product);
1061 if (IS_ERR(ptr: session->task))
1062 return PTR_ERR(ptr: session->task);
1063
1064 while (atomic_read(v: &session->state) <= HIDP_SESSION_IDLING)
1065 wait_event(session->state_queue,
1066 atomic_read(&session->state) > HIDP_SESSION_IDLING);
1067
1068 return 0;
1069}
1070
1071/*
1072 * Terminate session thread
1073 * Wake up session thread and notify it to stop. This is asynchronous and
1074 * returns immediately. Call this whenever a runtime error occurs and you want
1075 * the session to stop.
1076 * Note: wake_up_interruptible() performs any necessary memory-barriers for us.
1077 */
1078static void hidp_session_terminate(struct hidp_session *session)
1079{
1080 atomic_inc(v: &session->terminate);
1081 /*
1082 * See the comment preceding the call to wait_woken()
1083 * in hidp_session_run().
1084 */
1085 wake_up_interruptible(&hidp_session_wq);
1086}
1087
1088/*
1089 * Probe HIDP session
1090 * This is called from the l2cap_conn core when our l2cap_user object is bound
1091 * to the hci-connection. We get the session via the \user object and can now
1092 * start the session thread, link it into the global session list and
1093 * schedule HID/input device registration.
1094 * The global session-list owns its own reference to the session object so you
1095 * can drop your own reference after registering the l2cap_user object.
1096 */
1097static int hidp_session_probe(struct l2cap_conn *conn,
1098 struct l2cap_user *user)
1099{
1100 struct hidp_session *session = container_of(user,
1101 struct hidp_session,
1102 user);
1103 struct hidp_session *s;
1104 int ret;
1105
1106 down_write(sem: &hidp_session_sem);
1107
1108 /* check that no other session for this device exists */
1109 s = __hidp_session_find(bdaddr: &session->bdaddr);
1110 if (s) {
1111 ret = -EEXIST;
1112 goto out_unlock;
1113 }
1114
1115 if (session->input) {
1116 ret = hidp_session_dev_add(session);
1117 if (ret)
1118 goto out_unlock;
1119 }
1120
1121 ret = hidp_session_start_sync(session);
1122 if (ret)
1123 goto out_del;
1124
1125 /* HID device registration is async to allow I/O during probe */
1126 if (session->input)
1127 atomic_inc(v: &session->state);
1128 else
1129 schedule_work(work: &session->dev_init);
1130
1131 hidp_session_get(session);
1132 list_add(new: &session->list, head: &hidp_session_list);
1133 ret = 0;
1134 goto out_unlock;
1135
1136out_del:
1137 if (session->input)
1138 hidp_session_dev_del(session);
1139out_unlock:
1140 up_write(sem: &hidp_session_sem);
1141 return ret;
1142}
1143
1144/*
1145 * Remove HIDP session
1146 * Called from the l2cap_conn core when either we explicitly unregistered
1147 * the l2cap_user object or if the underlying connection is shut down.
1148 * We signal the hidp-session thread to shut down, unregister the HID/input
1149 * devices and unlink the session from the global list.
1150 * This drops the reference to the session that is owned by the global
1151 * session-list.
1152 * Note: We _must_ not synchronosly wait for the session-thread to shut down.
1153 * This is, because the session-thread might be waiting for an HCI lock that is
1154 * held while we are called. Therefore, we only unregister the devices and
1155 * notify the session-thread to terminate. The thread itself owns a reference
1156 * to the session object so it can safely shut down.
1157 */
1158static void hidp_session_remove(struct l2cap_conn *conn,
1159 struct l2cap_user *user)
1160{
1161 struct hidp_session *session = container_of(user,
1162 struct hidp_session,
1163 user);
1164
1165 down_write(sem: &hidp_session_sem);
1166
1167 hidp_session_terminate(session);
1168
1169 cancel_work_sync(work: &session->dev_init);
1170 if (session->input ||
1171 atomic_read(v: &session->state) > HIDP_SESSION_PREPARING)
1172 hidp_session_dev_del(session);
1173
1174 list_del(entry: &session->list);
1175
1176 up_write(sem: &hidp_session_sem);
1177
1178 hidp_session_put(session);
1179}
1180
1181/*
1182 * Session Worker
1183 * This performs the actual main-loop of the HIDP worker. We first check
1184 * whether the underlying connection is still alive, then parse all pending
1185 * messages and finally send all outstanding messages.
1186 */
1187static void hidp_session_run(struct hidp_session *session)
1188{
1189 struct sock *ctrl_sk = session->ctrl_sock->sk;
1190 struct sock *intr_sk = session->intr_sock->sk;
1191 struct sk_buff *skb;
1192 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1193
1194 add_wait_queue(wq_head: &hidp_session_wq, wq_entry: &wait);
1195 for (;;) {
1196 /*
1197 * This thread can be woken up two ways:
1198 * - You call hidp_session_terminate() which sets the
1199 * session->terminate flag and wakes this thread up.
1200 * - Via modifying the socket state of ctrl/intr_sock. This
1201 * thread is woken up by ->sk_state_changed().
1202 */
1203
1204 if (atomic_read(v: &session->terminate))
1205 break;
1206
1207 if (ctrl_sk->sk_state != BT_CONNECTED ||
1208 intr_sk->sk_state != BT_CONNECTED)
1209 break;
1210
1211 /* parse incoming intr-skbs */
1212 while ((skb = skb_dequeue(list: &intr_sk->sk_receive_queue))) {
1213 skb_orphan(skb);
1214 if (!skb_linearize(skb))
1215 hidp_recv_intr_frame(session, skb);
1216 else
1217 kfree_skb(skb);
1218 }
1219
1220 /* send pending intr-skbs */
1221 hidp_process_transmit(session, transmit: &session->intr_transmit,
1222 sock: session->intr_sock);
1223
1224 /* parse incoming ctrl-skbs */
1225 while ((skb = skb_dequeue(list: &ctrl_sk->sk_receive_queue))) {
1226 skb_orphan(skb);
1227 if (!skb_linearize(skb))
1228 hidp_recv_ctrl_frame(session, skb);
1229 else
1230 kfree_skb(skb);
1231 }
1232
1233 /* send pending ctrl-skbs */
1234 hidp_process_transmit(session, transmit: &session->ctrl_transmit,
1235 sock: session->ctrl_sock);
1236
1237 /*
1238 * wait_woken() performs the necessary memory barriers
1239 * for us; see the header comment for this primitive.
1240 */
1241 wait_woken(wq_entry: &wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
1242 }
1243 remove_wait_queue(wq_head: &hidp_session_wq, wq_entry: &wait);
1244
1245 atomic_inc(v: &session->terminate);
1246}
1247
1248static int hidp_session_wake_function(wait_queue_entry_t *wait,
1249 unsigned int mode,
1250 int sync, void *key)
1251{
1252 wake_up_interruptible(&hidp_session_wq);
1253 return false;
1254}
1255
1256/*
1257 * HIDP session thread
1258 * This thread runs the I/O for a single HIDP session. Startup is synchronous
1259 * which allows us to take references to ourself here instead of doing that in
1260 * the caller.
1261 * When we are ready to run we notify the caller and call hidp_session_run().
1262 */
1263static int hidp_session_thread(void *arg)
1264{
1265 struct hidp_session *session = arg;
1266 DEFINE_WAIT_FUNC(ctrl_wait, hidp_session_wake_function);
1267 DEFINE_WAIT_FUNC(intr_wait, hidp_session_wake_function);
1268
1269 BT_DBG("session %p", session);
1270
1271 /* initialize runtime environment */
1272 hidp_session_get(session);
1273 __module_get(THIS_MODULE);
1274 set_user_nice(current, nice: -15);
1275 hidp_set_timer(session);
1276
1277 add_wait_queue(wq_head: sk_sleep(sk: session->ctrl_sock->sk), wq_entry: &ctrl_wait);
1278 add_wait_queue(wq_head: sk_sleep(sk: session->intr_sock->sk), wq_entry: &intr_wait);
1279 /* This memory barrier is paired with wq_has_sleeper(). See
1280 * sock_poll_wait() for more information why this is needed. */
1281 smp_mb__before_atomic();
1282
1283 /* notify synchronous startup that we're ready */
1284 atomic_inc(v: &session->state);
1285 wake_up(&session->state_queue);
1286
1287 /* run session */
1288 hidp_session_run(session);
1289
1290 /* cleanup runtime environment */
1291 remove_wait_queue(wq_head: sk_sleep(sk: session->intr_sock->sk), wq_entry: &intr_wait);
1292 remove_wait_queue(wq_head: sk_sleep(sk: session->ctrl_sock->sk), wq_entry: &ctrl_wait);
1293 wake_up_interruptible(&session->report_queue);
1294 hidp_del_timer(session);
1295
1296 /*
1297 * If we stopped ourself due to any internal signal, we should try to
1298 * unregister our own session here to avoid having it linger until the
1299 * parent l2cap_conn dies or user-space cleans it up.
1300 * This does not deadlock as we don't do any synchronous shutdown.
1301 * Instead, this call has the same semantics as if user-space tried to
1302 * delete the session.
1303 */
1304 l2cap_unregister_user(conn: session->conn, user: &session->user);
1305 hidp_session_put(session);
1306
1307 module_put_and_kthread_exit(0);
1308 return 0;
1309}
1310
1311static int hidp_verify_sockets(struct socket *ctrl_sock,
1312 struct socket *intr_sock)
1313{
1314 struct l2cap_chan *ctrl_chan, *intr_chan;
1315 struct bt_sock *ctrl, *intr;
1316 struct hidp_session *session;
1317
1318 if (!l2cap_is_socket(sock: ctrl_sock) || !l2cap_is_socket(sock: intr_sock))
1319 return -EINVAL;
1320
1321 ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan;
1322 intr_chan = l2cap_pi(intr_sock->sk)->chan;
1323
1324 if (bacmp(ba1: &ctrl_chan->src, ba2: &intr_chan->src) ||
1325 bacmp(ba1: &ctrl_chan->dst, ba2: &intr_chan->dst))
1326 return -ENOTUNIQ;
1327
1328 ctrl = bt_sk(ctrl_sock->sk);
1329 intr = bt_sk(intr_sock->sk);
1330
1331 if (ctrl->sk.sk_state != BT_CONNECTED ||
1332 intr->sk.sk_state != BT_CONNECTED)
1333 return -EBADFD;
1334
1335 /* early session check, we check again during session registration */
1336 session = hidp_session_find(bdaddr: &ctrl_chan->dst);
1337 if (session) {
1338 hidp_session_put(session);
1339 return -EEXIST;
1340 }
1341
1342 return 0;
1343}
1344
1345int hidp_connection_add(const struct hidp_connadd_req *req,
1346 struct socket *ctrl_sock,
1347 struct socket *intr_sock)
1348{
1349 u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG) |
1350 BIT(HIDP_BOOT_PROTOCOL_MODE);
1351 struct hidp_session *session;
1352 struct l2cap_conn *conn;
1353 struct l2cap_chan *chan;
1354 int ret;
1355
1356 ret = hidp_verify_sockets(ctrl_sock, intr_sock);
1357 if (ret)
1358 return ret;
1359
1360 if (req->flags & ~valid_flags)
1361 return -EINVAL;
1362
1363 chan = l2cap_pi(ctrl_sock->sk)->chan;
1364 conn = NULL;
1365 l2cap_chan_lock(chan);
1366 if (chan->conn)
1367 conn = l2cap_conn_get(conn: chan->conn);
1368 l2cap_chan_unlock(chan);
1369
1370 if (!conn)
1371 return -EBADFD;
1372
1373 ret = hidp_session_new(out: &session, bdaddr: &chan->dst, ctrl_sock,
1374 intr_sock, req, conn);
1375 if (ret)
1376 goto out_conn;
1377
1378 ret = l2cap_register_user(conn, user: &session->user);
1379 if (ret)
1380 goto out_session;
1381
1382 ret = 0;
1383
1384out_session:
1385 hidp_session_put(session);
1386out_conn:
1387 l2cap_conn_put(conn);
1388 return ret;
1389}
1390
1391int hidp_connection_del(struct hidp_conndel_req *req)
1392{
1393 u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG);
1394 struct hidp_session *session;
1395
1396 if (req->flags & ~valid_flags)
1397 return -EINVAL;
1398
1399 session = hidp_session_find(bdaddr: &req->bdaddr);
1400 if (!session)
1401 return -ENOENT;
1402
1403 if (req->flags & BIT(HIDP_VIRTUAL_CABLE_UNPLUG))
1404 hidp_send_ctrl_message(session,
1405 HIDP_TRANS_HID_CONTROL |
1406 HIDP_CTRL_VIRTUAL_CABLE_UNPLUG,
1407 NULL, size: 0);
1408 else
1409 l2cap_unregister_user(conn: session->conn, user: &session->user);
1410
1411 hidp_session_put(session);
1412
1413 return 0;
1414}
1415
1416int hidp_get_connlist(struct hidp_connlist_req *req)
1417{
1418 struct hidp_session *session;
1419 int err = 0, n = 0;
1420
1421 BT_DBG("");
1422
1423 down_read(sem: &hidp_session_sem);
1424
1425 list_for_each_entry(session, &hidp_session_list, list) {
1426 struct hidp_conninfo ci;
1427
1428 hidp_copy_session(session, ci: &ci);
1429
1430 if (copy_to_user(to: req->ci, from: &ci, n: sizeof(ci))) {
1431 err = -EFAULT;
1432 break;
1433 }
1434
1435 if (++n >= req->cnum)
1436 break;
1437
1438 req->ci++;
1439 }
1440 req->cnum = n;
1441
1442 up_read(sem: &hidp_session_sem);
1443 return err;
1444}
1445
1446int hidp_get_conninfo(struct hidp_conninfo *ci)
1447{
1448 struct hidp_session *session;
1449
1450 session = hidp_session_find(bdaddr: &ci->bdaddr);
1451 if (session) {
1452 hidp_copy_session(session, ci);
1453 hidp_session_put(session);
1454 }
1455
1456 return session ? 0 : -ENOENT;
1457}
1458
1459static int __init hidp_init(void)
1460{
1461 BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);
1462
1463 return hidp_init_sockets();
1464}
1465
1466static void __exit hidp_exit(void)
1467{
1468 hidp_cleanup_sockets();
1469}
1470
1471module_init(hidp_init);
1472module_exit(hidp_exit);
1473
1474MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1475MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
1476MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
1477MODULE_VERSION(VERSION);
1478MODULE_LICENSE("GPL");
1479MODULE_ALIAS("bt-proto-6");
1480

source code of linux/net/bluetooth/hidp/core.c