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1/*
2 HIDP implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org>
4 Copyright (C) 2013 David Herrmann <dh.herrmann@gmail.com>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License version 2 as
8 published by the Free Software Foundation;
9
10 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
11 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
13 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
14 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
15 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18
19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
21 SOFTWARE IS DISCLAIMED.
22*/
23
24#include <linux/kref.h>
25#include <linux/module.h>
26#include <linux/file.h>
27#include <linux/kthread.h>
28#include <linux/hidraw.h>
29
30#include <net/bluetooth/bluetooth.h>
31#include <net/bluetooth/hci_core.h>
32#include <net/bluetooth/l2cap.h>
33
34#include "hidp.h"
35
36#define VERSION "1.2"
37
38static DECLARE_RWSEM(hidp_session_sem);
39static LIST_HEAD(hidp_session_list);
40
41static unsigned char hidp_keycode[256] = {
42 0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36,
43 37, 38, 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45,
44 21, 44, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 28, 1,
45 14, 15, 57, 12, 13, 26, 27, 43, 43, 39, 40, 41, 51, 52,
46 53, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 87, 88,
47 99, 70, 119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103, 69,
48 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71, 72, 73,
49 82, 83, 86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189, 190,
50 191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135,
51 136, 113, 115, 114, 0, 0, 0, 121, 0, 89, 93, 124, 92, 94,
52 95, 0, 0, 0, 122, 123, 90, 91, 85, 0, 0, 0, 0, 0,
53 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
54 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
55 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
56 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
57 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
58 29, 42, 56, 125, 97, 54, 100, 126, 164, 166, 165, 163, 161, 115,
59 114, 113, 150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140
60};
61
62static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 };
63
64static int hidp_session_probe(struct l2cap_conn *conn,
65 struct l2cap_user *user);
66static void hidp_session_remove(struct l2cap_conn *conn,
67 struct l2cap_user *user);
68static int hidp_session_thread(void *arg);
69static void hidp_session_terminate(struct hidp_session *s);
70
71static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
72{
73 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");
1/*
2 HIDP implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org>
4 Copyright (C) 2013 David Herrmann <dh.herrmann@gmail.com>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License version 2 as
8 published by the Free Software Foundation;
9
10 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
11 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
13 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
14 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
15 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18
19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
21 SOFTWARE IS DISCLAIMED.
22*/
23
24#include <linux/kref.h>
25#include <linux/module.h>
26#include <linux/file.h>
27#include <linux/kthread.h>
28#include <linux/hidraw.h>
29
30#include <net/bluetooth/bluetooth.h>
31#include <net/bluetooth/hci_core.h>
32#include <net/bluetooth/l2cap.h>
33
34#include "hidp.h"
35
36#define VERSION "1.2"
37
38static DECLARE_RWSEM(hidp_session_sem);
39static LIST_HEAD(hidp_session_list);
40
41static unsigned char hidp_keycode[256] = {
42 0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36,
43 37, 38, 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45,
44 21, 44, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 28, 1,
45 14, 15, 57, 12, 13, 26, 27, 43, 43, 39, 40, 41, 51, 52,
46 53, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 87, 88,
47 99, 70, 119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103, 69,
48 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71, 72, 73,
49 82, 83, 86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189, 190,
50 191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135,
51 136, 113, 115, 114, 0, 0, 0, 121, 0, 89, 93, 124, 92, 94,
52 95, 0, 0, 0, 122, 123, 90, 91, 85, 0, 0, 0, 0, 0,
53 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
54 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
55 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
56 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
57 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
58 29, 42, 56, 125, 97, 54, 100, 126, 164, 166, 165, 163, 161, 115,
59 114, 113, 150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140
60};
61
62static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 };
63
64static int hidp_session_probe(struct l2cap_conn *conn,
65 struct l2cap_user *user);
66static void hidp_session_remove(struct l2cap_conn *conn,
67 struct l2cap_user *user);
68static int hidp_session_thread(void *arg);
69static void hidp_session_terminate(struct hidp_session *s);
70
71static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
72{
73 memset(ci, 0, sizeof(*ci));
74 bacpy(&ci->bdaddr, &session->bdaddr);
75
76 ci->flags = session->flags;
77 ci->state = BT_CONNECTED;
78
79 if (session->input) {
80 ci->vendor = session->input->id.vendor;
81 ci->product = session->input->id.product;
82 ci->version = session->input->id.version;
83 if (session->input->name)
84 strlcpy(ci->name, session->input->name, 128);
85 else
86 strlcpy(ci->name, "HID Boot Device", 128);
87 } else if (session->hid) {
88 ci->vendor = session->hid->vendor;
89 ci->product = session->hid->product;
90 ci->version = session->hid->version;
91 strlcpy(ci->name, session->hid->name, 128);
92 }
93}
94
95/* assemble skb, queue message on @transmit and wake up the session thread */
96static int hidp_send_message(struct hidp_session *session, struct socket *sock,
97 struct sk_buff_head *transmit, unsigned char hdr,
98 const unsigned char *data, int size)
99{
100 struct sk_buff *skb;
101 struct sock *sk = sock->sk;
102
103 BT_DBG("session %p data %p size %d", session, data, size);
104
105 if (atomic_read(&session->terminate))
106 return -EIO;
107
108 skb = alloc_skb(size + 1, GFP_ATOMIC);
109 if (!skb) {
110 BT_ERR("Can't allocate memory for new frame");
111 return -ENOMEM;
112 }
113
114 *skb_put(skb, 1) = hdr;
115 if (data && size > 0)
116 memcpy(skb_put(skb, size), data, size);
117
118 skb_queue_tail(transmit, skb);
119 wake_up_interruptible(sk_sleep(sk));
120
121 return 0;
122}
123
124static int hidp_send_ctrl_message(struct hidp_session *session,
125 unsigned char hdr, const unsigned char *data,
126 int size)
127{
128 return hidp_send_message(session, session->ctrl_sock,
129 &session->ctrl_transmit, hdr, data, size);
130}
131
132static int hidp_send_intr_message(struct hidp_session *session,
133 unsigned char hdr, const unsigned char *data,
134 int size)
135{
136 return hidp_send_message(session, session->intr_sock,
137 &session->intr_transmit, hdr, data, size);
138}
139
140static int hidp_input_event(struct input_dev *dev, unsigned int type,
141 unsigned int code, int value)
142{
143 struct hidp_session *session = input_get_drvdata(dev);
144 unsigned char newleds;
145 unsigned char hdr, data[2];
146
147 BT_DBG("session %p type %d code %d value %d",
148 session, type, code, value);
149
150 if (type != EV_LED)
151 return -1;
152
153 newleds = (!!test_bit(LED_KANA, dev->led) << 3) |
154 (!!test_bit(LED_COMPOSE, dev->led) << 3) |
155 (!!test_bit(LED_SCROLLL, dev->led) << 2) |
156 (!!test_bit(LED_CAPSL, dev->led) << 1) |
157 (!!test_bit(LED_NUML, dev->led));
158
159 if (session->leds == newleds)
160 return 0;
161
162 session->leds = newleds;
163
164 hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
165 data[0] = 0x01;
166 data[1] = newleds;
167
168 return hidp_send_intr_message(session, hdr, data, 2);
169}
170
171static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb)
172{
173 struct input_dev *dev = session->input;
174 unsigned char *keys = session->keys;
175 unsigned char *udata = skb->data + 1;
176 signed char *sdata = skb->data + 1;
177 int i, size = skb->len - 1;
178
179 switch (skb->data[0]) {
180 case 0x01: /* Keyboard report */
181 for (i = 0; i < 8; i++)
182 input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1);
183
184 /* If all the key codes have been set to 0x01, it means
185 * too many keys were pressed at the same time. */
186 if (!memcmp(udata + 2, hidp_mkeyspat, 6))
187 break;
188
189 for (i = 2; i < 8; i++) {
190 if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) {
191 if (hidp_keycode[keys[i]])
192 input_report_key(dev, hidp_keycode[keys[i]], 0);
193 else
194 BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
195 }
196
197 if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) {
198 if (hidp_keycode[udata[i]])
199 input_report_key(dev, hidp_keycode[udata[i]], 1);
200 else
201 BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]);
202 }
203 }
204
205 memcpy(keys, udata, 8);
206 break;
207
208 case 0x02: /* Mouse report */
209 input_report_key(dev, BTN_LEFT, sdata[0] & 0x01);
210 input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02);
211 input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04);
212 input_report_key(dev, BTN_SIDE, sdata[0] & 0x08);
213 input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10);
214
215 input_report_rel(dev, REL_X, sdata[1]);
216 input_report_rel(dev, REL_Y, sdata[2]);
217
218 if (size > 3)
219 input_report_rel(dev, REL_WHEEL, sdata[3]);
220 break;
221 }
222
223 input_sync(dev);
224}
225
226static int hidp_get_raw_report(struct hid_device *hid,
227 unsigned char report_number,
228 unsigned char *data, size_t count,
229 unsigned char report_type)
230{
231 struct hidp_session *session = hid->driver_data;
232 struct sk_buff *skb;
233 size_t len;
234 int numbered_reports = hid->report_enum[report_type].numbered;
235 int ret;
236
237 if (atomic_read(&session->terminate))
238 return -EIO;
239
240 switch (report_type) {
241 case HID_FEATURE_REPORT:
242 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE;
243 break;
244 case HID_INPUT_REPORT:
245 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT;
246 break;
247 case HID_OUTPUT_REPORT:
248 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT;
249 break;
250 default:
251 return -EINVAL;
252 }
253
254 if (mutex_lock_interruptible(&session->report_mutex))
255 return -ERESTARTSYS;
256
257 /* Set up our wait, and send the report request to the device. */
258 session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK;
259 session->waiting_report_number = numbered_reports ? report_number : -1;
260 set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
261 data[0] = report_number;
262 ret = hidp_send_ctrl_message(session, report_type, data, 1);
263 if (ret)
264 goto err;
265
266 /* Wait for the return of the report. The returned report
267 gets put in session->report_return. */
268 while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
269 !atomic_read(&session->terminate)) {
270 int res;
271
272 res = wait_event_interruptible_timeout(session->report_queue,
273 !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)
274 || atomic_read(&session->terminate),
275 5*HZ);
276 if (res == 0) {
277 /* timeout */
278 ret = -EIO;
279 goto err;
280 }
281 if (res < 0) {
282 /* signal */
283 ret = -ERESTARTSYS;
284 goto err;
285 }
286 }
287
288 skb = session->report_return;
289 if (skb) {
290 len = skb->len < count ? skb->len : count;
291 memcpy(data, skb->data, len);
292
293 kfree_skb(skb);
294 session->report_return = NULL;
295 } else {
296 /* Device returned a HANDSHAKE, indicating protocol error. */
297 len = -EIO;
298 }
299
300 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
301 mutex_unlock(&session->report_mutex);
302
303 return len;
304
305err:
306 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
307 mutex_unlock(&session->report_mutex);
308 return ret;
309}
310
311static int hidp_set_raw_report(struct hid_device *hid, unsigned char reportnum,
312 unsigned char *data, size_t count,
313 unsigned char report_type)
314{
315 struct hidp_session *session = hid->driver_data;
316 int ret;
317
318 switch (report_type) {
319 case HID_FEATURE_REPORT:
320 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE;
321 break;
322 case HID_INPUT_REPORT:
323 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_INPUT;
324 break;
325 case HID_OUTPUT_REPORT:
326 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT;
327 break;
328 default:
329 return -EINVAL;
330 }
331
332 if (mutex_lock_interruptible(&session->report_mutex))
333 return -ERESTARTSYS;
334
335 /* Set up our wait, and send the report request to the device. */
336 data[0] = reportnum;
337 set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
338 ret = hidp_send_ctrl_message(session, report_type, data, count);
339 if (ret)
340 goto err;
341
342 /* Wait for the ACK from the device. */
343 while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) &&
344 !atomic_read(&session->terminate)) {
345 int res;
346
347 res = wait_event_interruptible_timeout(session->report_queue,
348 !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)
349 || atomic_read(&session->terminate),
350 10*HZ);
351 if (res == 0) {
352 /* timeout */
353 ret = -EIO;
354 goto err;
355 }
356 if (res < 0) {
357 /* signal */
358 ret = -ERESTARTSYS;
359 goto err;
360 }
361 }
362
363 if (!session->output_report_success) {
364 ret = -EIO;
365 goto err;
366 }
367
368 ret = count;
369
370err:
371 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
372 mutex_unlock(&session->report_mutex);
373 return ret;
374}
375
376static int hidp_output_report(struct hid_device *hid, __u8 *data, size_t count)
377{
378 struct hidp_session *session = hid->driver_data;
379
380 return hidp_send_intr_message(session,
381 HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT,
382 data, count);
383}
384
385static int hidp_raw_request(struct hid_device *hid, unsigned char reportnum,
386 __u8 *buf, size_t len, unsigned char rtype,
387 int reqtype)
388{
389 switch (reqtype) {
390 case HID_REQ_GET_REPORT:
391 return hidp_get_raw_report(hid, reportnum, buf, len, rtype);
392 case HID_REQ_SET_REPORT:
393 return hidp_set_raw_report(hid, reportnum, buf, len, rtype);
394 default:
395 return -EIO;
396 }
397}
398
399static void hidp_idle_timeout(unsigned long arg)
400{
401 struct hidp_session *session = (struct hidp_session *) arg;
402
403 hidp_session_terminate(session);
404}
405
406static void hidp_set_timer(struct hidp_session *session)
407{
408 if (session->idle_to > 0)
409 mod_timer(&session->timer, jiffies + HZ * session->idle_to);
410}
411
412static void hidp_del_timer(struct hidp_session *session)
413{
414 if (session->idle_to > 0)
415 del_timer(&session->timer);
416}
417
418static void hidp_process_report(struct hidp_session *session,
419 int type, const u8 *data, int len, int intr)
420{
421 if (len > HID_MAX_BUFFER_SIZE)
422 len = HID_MAX_BUFFER_SIZE;
423
424 memcpy(session->input_buf, data, len);
425 hid_input_report(session->hid, type, session->input_buf, len, intr);
426}
427
428static void hidp_process_handshake(struct hidp_session *session,
429 unsigned char param)
430{
431 BT_DBG("session %p param 0x%02x", session, param);
432 session->output_report_success = 0; /* default condition */
433
434 switch (param) {
435 case HIDP_HSHK_SUCCESSFUL:
436 /* FIXME: Call into SET_ GET_ handlers here */
437 session->output_report_success = 1;
438 break;
439
440 case HIDP_HSHK_NOT_READY:
441 case HIDP_HSHK_ERR_INVALID_REPORT_ID:
442 case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST:
443 case HIDP_HSHK_ERR_INVALID_PARAMETER:
444 if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags))
445 wake_up_interruptible(&session->report_queue);
446
447 /* FIXME: Call into SET_ GET_ handlers here */
448 break;
449
450 case HIDP_HSHK_ERR_UNKNOWN:
451 break;
452
453 case HIDP_HSHK_ERR_FATAL:
454 /* Device requests a reboot, as this is the only way this error
455 * can be recovered. */
456 hidp_send_ctrl_message(session,
457 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0);
458 break;
459
460 default:
461 hidp_send_ctrl_message(session,
462 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
463 break;
464 }
465
466 /* Wake up the waiting thread. */
467 if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags))
468 wake_up_interruptible(&session->report_queue);
469}
470
471static void hidp_process_hid_control(struct hidp_session *session,
472 unsigned char param)
473{
474 BT_DBG("session %p param 0x%02x", session, param);
475
476 if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) {
477 /* Flush the transmit queues */
478 skb_queue_purge(&session->ctrl_transmit);
479 skb_queue_purge(&session->intr_transmit);
480
481 hidp_session_terminate(session);
482 }
483}
484
485/* Returns true if the passed-in skb should be freed by the caller. */
486static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb,
487 unsigned char param)
488{
489 int done_with_skb = 1;
490 BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param);
491
492 switch (param) {
493 case HIDP_DATA_RTYPE_INPUT:
494 hidp_set_timer(session);
495
496 if (session->input)
497 hidp_input_report(session, skb);
498
499 if (session->hid)
500 hidp_process_report(session, HID_INPUT_REPORT,
501 skb->data, skb->len, 0);
502 break;
503
504 case HIDP_DATA_RTYPE_OTHER:
505 case HIDP_DATA_RTYPE_OUPUT:
506 case HIDP_DATA_RTYPE_FEATURE:
507 break;
508
509 default:
510 hidp_send_ctrl_message(session,
511 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
512 }
513
514 if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
515 param == session->waiting_report_type) {
516 if (session->waiting_report_number < 0 ||
517 session->waiting_report_number == skb->data[0]) {
518 /* hidp_get_raw_report() is waiting on this report. */
519 session->report_return = skb;
520 done_with_skb = 0;
521 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
522 wake_up_interruptible(&session->report_queue);
523 }
524 }
525
526 return done_with_skb;
527}
528
529static void hidp_recv_ctrl_frame(struct hidp_session *session,
530 struct sk_buff *skb)
531{
532 unsigned char hdr, type, param;
533 int free_skb = 1;
534
535 BT_DBG("session %p skb %p len %d", session, skb, skb->len);
536
537 hdr = skb->data[0];
538 skb_pull(skb, 1);
539
540 type = hdr & HIDP_HEADER_TRANS_MASK;
541 param = hdr & HIDP_HEADER_PARAM_MASK;
542
543 switch (type) {
544 case HIDP_TRANS_HANDSHAKE:
545 hidp_process_handshake(session, param);
546 break;
547
548 case HIDP_TRANS_HID_CONTROL:
549 hidp_process_hid_control(session, param);
550 break;
551
552 case HIDP_TRANS_DATA:
553 free_skb = hidp_process_data(session, skb, param);
554 break;
555
556 default:
557 hidp_send_ctrl_message(session,
558 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0);
559 break;
560 }
561
562 if (free_skb)
563 kfree_skb(skb);
564}
565
566static void hidp_recv_intr_frame(struct hidp_session *session,
567 struct sk_buff *skb)
568{
569 unsigned char hdr;
570
571 BT_DBG("session %p skb %p len %d", session, skb, skb->len);
572
573 hdr = skb->data[0];
574 skb_pull(skb, 1);
575
576 if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) {
577 hidp_set_timer(session);
578
579 if (session->input)
580 hidp_input_report(session, skb);
581
582 if (session->hid) {
583 hidp_process_report(session, HID_INPUT_REPORT,
584 skb->data, skb->len, 1);
585 BT_DBG("report len %d", skb->len);
586 }
587 } else {
588 BT_DBG("Unsupported protocol header 0x%02x", hdr);
589 }
590
591 kfree_skb(skb);
592}
593
594static int hidp_send_frame(struct socket *sock, unsigned char *data, int len)
595{
596 struct kvec iv = { data, len };
597 struct msghdr msg;
598
599 BT_DBG("sock %p data %p len %d", sock, data, len);
600
601 if (!len)
602 return 0;
603
604 memset(&msg, 0, sizeof(msg));
605
606 return kernel_sendmsg(sock, &msg, &iv, 1, len);
607}
608
609/* dequeue message from @transmit and send via @sock */
610static void hidp_process_transmit(struct hidp_session *session,
611 struct sk_buff_head *transmit,
612 struct socket *sock)
613{
614 struct sk_buff *skb;
615 int ret;
616
617 BT_DBG("session %p", session);
618
619 while ((skb = skb_dequeue(transmit))) {
620 ret = hidp_send_frame(sock, skb->data, skb->len);
621 if (ret == -EAGAIN) {
622 skb_queue_head(transmit, skb);
623 break;
624 } else if (ret < 0) {
625 hidp_session_terminate(session);
626 kfree_skb(skb);
627 break;
628 }
629
630 hidp_set_timer(session);
631 kfree_skb(skb);
632 }
633}
634
635static int hidp_setup_input(struct hidp_session *session,
636 struct hidp_connadd_req *req)
637{
638 struct input_dev *input;
639 int i;
640
641 input = input_allocate_device();
642 if (!input)
643 return -ENOMEM;
644
645 session->input = input;
646
647 input_set_drvdata(input, session);
648
649 input->name = "Bluetooth HID Boot Protocol Device";
650
651 input->id.bustype = BUS_BLUETOOTH;
652 input->id.vendor = req->vendor;
653 input->id.product = req->product;
654 input->id.version = req->version;
655
656 if (req->subclass & 0x40) {
657 set_bit(EV_KEY, input->evbit);
658 set_bit(EV_LED, input->evbit);
659 set_bit(EV_REP, input->evbit);
660
661 set_bit(LED_NUML, input->ledbit);
662 set_bit(LED_CAPSL, input->ledbit);
663 set_bit(LED_SCROLLL, input->ledbit);
664 set_bit(LED_COMPOSE, input->ledbit);
665 set_bit(LED_KANA, input->ledbit);
666
667 for (i = 0; i < sizeof(hidp_keycode); i++)
668 set_bit(hidp_keycode[i], input->keybit);
669 clear_bit(0, input->keybit);
670 }
671
672 if (req->subclass & 0x80) {
673 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
674 input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
675 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
676 input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
677 input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
678 BIT_MASK(BTN_EXTRA);
679 input->relbit[0] |= BIT_MASK(REL_WHEEL);
680 }
681
682 input->dev.parent = &session->conn->hcon->dev;
683
684 input->event = hidp_input_event;
685
686 return 0;
687}
688
689static int hidp_open(struct hid_device *hid)
690{
691 return 0;
692}
693
694static void hidp_close(struct hid_device *hid)
695{
696}
697
698static int hidp_parse(struct hid_device *hid)
699{
700 struct hidp_session *session = hid->driver_data;
701
702 return hid_parse_report(session->hid, session->rd_data,
703 session->rd_size);
704}
705
706static int hidp_start(struct hid_device *hid)
707{
708 return 0;
709}
710
711static void hidp_stop(struct hid_device *hid)
712{
713 struct hidp_session *session = hid->driver_data;
714
715 skb_queue_purge(&session->ctrl_transmit);
716 skb_queue_purge(&session->intr_transmit);
717
718 hid->claimed = 0;
719}
720
721static struct hid_ll_driver hidp_hid_driver = {
722 .parse = hidp_parse,
723 .start = hidp_start,
724 .stop = hidp_stop,
725 .open = hidp_open,
726 .close = hidp_close,
727 .raw_request = hidp_raw_request,
728 .output_report = hidp_output_report,
729};
730
731/* This function sets up the hid device. It does not add it
732 to the HID system. That is done in hidp_add_connection(). */
733static int hidp_setup_hid(struct hidp_session *session,
734 struct hidp_connadd_req *req)
735{
736 struct hid_device *hid;
737 int err;
738
739 session->rd_data = kzalloc(req->rd_size, GFP_KERNEL);
740 if (!session->rd_data)
741 return -ENOMEM;
742
743 if (copy_from_user(session->rd_data, req->rd_data, req->rd_size)) {
744 err = -EFAULT;
745 goto fault;
746 }
747 session->rd_size = req->rd_size;
748
749 hid = hid_allocate_device();
750 if (IS_ERR(hid)) {
751 err = PTR_ERR(hid);
752 goto fault;
753 }
754
755 session->hid = hid;
756
757 hid->driver_data = session;
758
759 hid->bus = BUS_BLUETOOTH;
760 hid->vendor = req->vendor;
761 hid->product = req->product;
762 hid->version = req->version;
763 hid->country = req->country;
764
765 strncpy(hid->name, req->name, sizeof(req->name) - 1);
766
767 snprintf(hid->phys, sizeof(hid->phys), "%pMR",
768 &l2cap_pi(session->ctrl_sock->sk)->chan->src);
769
770 /* NOTE: Some device modules depend on the dst address being stored in
771 * uniq. Please be aware of this before making changes to this behavior.
772 */
773 snprintf(hid->uniq, sizeof(hid->uniq), "%pMR",
774 &l2cap_pi(session->ctrl_sock->sk)->chan->dst);
775
776 hid->dev.parent = &session->conn->hcon->dev;
777 hid->ll_driver = &hidp_hid_driver;
778
779 /* True if device is blacklisted in drivers/hid/hid-core.c */
780 if (hid_ignore(hid)) {
781 hid_destroy_device(session->hid);
782 session->hid = NULL;
783 return -ENODEV;
784 }
785
786 return 0;
787
788fault:
789 kfree(session->rd_data);
790 session->rd_data = NULL;
791
792 return err;
793}
794
795/* initialize session devices */
796static int hidp_session_dev_init(struct hidp_session *session,
797 struct hidp_connadd_req *req)
798{
799 int ret;
800
801 if (req->rd_size > 0) {
802 ret = hidp_setup_hid(session, req);
803 if (ret && ret != -ENODEV)
804 return ret;
805 }
806
807 if (!session->hid) {
808 ret = hidp_setup_input(session, req);
809 if (ret < 0)
810 return ret;
811 }
812
813 return 0;
814}
815
816/* destroy session devices */
817static void hidp_session_dev_destroy(struct hidp_session *session)
818{
819 if (session->hid)
820 put_device(&session->hid->dev);
821 else if (session->input)
822 input_put_device(session->input);
823
824 kfree(session->rd_data);
825 session->rd_data = NULL;
826}
827
828/* add HID/input devices to their underlying bus systems */
829static int hidp_session_dev_add(struct hidp_session *session)
830{
831 int ret;
832
833 /* Both HID and input systems drop a ref-count when unregistering the
834 * device but they don't take a ref-count when registering them. Work
835 * around this by explicitly taking a refcount during registration
836 * which is dropped automatically by unregistering the devices. */
837
838 if (session->hid) {
839 ret = hid_add_device(session->hid);
840 if (ret)
841 return ret;
842 get_device(&session->hid->dev);
843 } else if (session->input) {
844 ret = input_register_device(session->input);
845 if (ret)
846 return ret;
847 input_get_device(session->input);
848 }
849
850 return 0;
851}
852
853/* remove HID/input devices from their bus systems */
854static void hidp_session_dev_del(struct hidp_session *session)
855{
856 if (session->hid)
857 hid_destroy_device(session->hid);
858 else if (session->input)
859 input_unregister_device(session->input);
860}
861
862/*
863 * Asynchronous device registration
864 * HID device drivers might want to perform I/O during initialization to
865 * detect device types. Therefore, call device registration in a separate
866 * worker so the HIDP thread can schedule I/O operations.
867 * Note that this must be called after the worker thread was initialized
868 * successfully. This will then add the devices and increase session state
869 * on success, otherwise it will terminate the session thread.
870 */
871static void hidp_session_dev_work(struct work_struct *work)
872{
873 struct hidp_session *session = container_of(work,
874 struct hidp_session,
875 dev_init);
876 int ret;
877
878 ret = hidp_session_dev_add(session);
879 if (!ret)
880 atomic_inc(&session->state);
881 else
882 hidp_session_terminate(session);
883}
884
885/*
886 * Create new session object
887 * Allocate session object, initialize static fields, copy input data into the
888 * object and take a reference to all sub-objects.
889 * This returns 0 on success and puts a pointer to the new session object in
890 * \out. Otherwise, an error code is returned.
891 * The new session object has an initial ref-count of 1.
892 */
893static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
894 struct socket *ctrl_sock,
895 struct socket *intr_sock,
896 struct hidp_connadd_req *req,
897 struct l2cap_conn *conn)
898{
899 struct hidp_session *session;
900 int ret;
901 struct bt_sock *ctrl, *intr;
902
903 ctrl = bt_sk(ctrl_sock->sk);
904 intr = bt_sk(intr_sock->sk);
905
906 session = kzalloc(sizeof(*session), GFP_KERNEL);
907 if (!session)
908 return -ENOMEM;
909
910 /* object and runtime management */
911 kref_init(&session->ref);
912 atomic_set(&session->state, HIDP_SESSION_IDLING);
913 init_waitqueue_head(&session->state_queue);
914 session->flags = req->flags & (1 << HIDP_BLUETOOTH_VENDOR_ID);
915
916 /* connection management */
917 bacpy(&session->bdaddr, bdaddr);
918 session->conn = conn;
919 session->user.probe = hidp_session_probe;
920 session->user.remove = hidp_session_remove;
921 session->ctrl_sock = ctrl_sock;
922 session->intr_sock = intr_sock;
923 skb_queue_head_init(&session->ctrl_transmit);
924 skb_queue_head_init(&session->intr_transmit);
925 session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu,
926 l2cap_pi(ctrl)->chan->imtu);
927 session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu,
928 l2cap_pi(intr)->chan->imtu);
929 session->idle_to = req->idle_to;
930
931 /* device management */
932 INIT_WORK(&session->dev_init, hidp_session_dev_work);
933 setup_timer(&session->timer, hidp_idle_timeout,
934 (unsigned long)session);
935
936 /* session data */
937 mutex_init(&session->report_mutex);
938 init_waitqueue_head(&session->report_queue);
939
940 ret = hidp_session_dev_init(session, req);
941 if (ret)
942 goto err_free;
943
944 l2cap_conn_get(session->conn);
945 get_file(session->intr_sock->file);
946 get_file(session->ctrl_sock->file);
947 *out = session;
948 return 0;
949
950err_free:
951 kfree(session);
952 return ret;
953}
954
955/* increase ref-count of the given session by one */
956static void hidp_session_get(struct hidp_session *session)
957{
958 kref_get(&session->ref);
959}
960
961/* release callback */
962static void session_free(struct kref *ref)
963{
964 struct hidp_session *session = container_of(ref, struct hidp_session,
965 ref);
966
967 hidp_session_dev_destroy(session);
968 skb_queue_purge(&session->ctrl_transmit);
969 skb_queue_purge(&session->intr_transmit);
970 fput(session->intr_sock->file);
971 fput(session->ctrl_sock->file);
972 l2cap_conn_put(session->conn);
973 kfree(session);
974}
975
976/* decrease ref-count of the given session by one */
977static void hidp_session_put(struct hidp_session *session)
978{
979 kref_put(&session->ref, session_free);
980}
981
982/*
983 * Search the list of active sessions for a session with target address
984 * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as
985 * you do not release this lock, the session objects cannot vanish and you can
986 * safely take a reference to the session yourself.
987 */
988static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr)
989{
990 struct hidp_session *session;
991
992 list_for_each_entry(session, &hidp_session_list, list) {
993 if (!bacmp(bdaddr, &session->bdaddr))
994 return session;
995 }
996
997 return NULL;
998}
999
1000/*
1001 * Same as __hidp_session_find() but no locks must be held. This also takes a
1002 * reference of the returned session (if non-NULL) so you must drop this
1003 * reference if you no longer use the object.
1004 */
1005static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr)
1006{
1007 struct hidp_session *session;
1008
1009 down_read(&hidp_session_sem);
1010
1011 session = __hidp_session_find(bdaddr);
1012 if (session)
1013 hidp_session_get(session);
1014
1015 up_read(&hidp_session_sem);
1016
1017 return session;
1018}
1019
1020/*
1021 * Start session synchronously
1022 * This starts a session thread and waits until initialization
1023 * is done or returns an error if it couldn't be started.
1024 * If this returns 0 the session thread is up and running. You must call
1025 * hipd_session_stop_sync() before deleting any runtime resources.
1026 */
1027static int hidp_session_start_sync(struct hidp_session *session)
1028{
1029 unsigned int vendor, product;
1030
1031 if (session->hid) {
1032 vendor = session->hid->vendor;
1033 product = session->hid->product;
1034 } else if (session->input) {
1035 vendor = session->input->id.vendor;
1036 product = session->input->id.product;
1037 } else {
1038 vendor = 0x0000;
1039 product = 0x0000;
1040 }
1041
1042 session->task = kthread_run(hidp_session_thread, session,
1043 "khidpd_%04x%04x", vendor, product);
1044 if (IS_ERR(session->task))
1045 return PTR_ERR(session->task);
1046
1047 while (atomic_read(&session->state) <= HIDP_SESSION_IDLING)
1048 wait_event(session->state_queue,
1049 atomic_read(&session->state) > HIDP_SESSION_IDLING);
1050
1051 return 0;
1052}
1053
1054/*
1055 * Terminate session thread
1056 * Wake up session thread and notify it to stop. This is asynchronous and
1057 * returns immediately. Call this whenever a runtime error occurs and you want
1058 * the session to stop.
1059 * Note: wake_up_process() performs any necessary memory-barriers for us.
1060 */
1061static void hidp_session_terminate(struct hidp_session *session)
1062{
1063 atomic_inc(&session->terminate);
1064 wake_up_process(session->task);
1065}
1066
1067/*
1068 * Probe HIDP session
1069 * This is called from the l2cap_conn core when our l2cap_user object is bound
1070 * to the hci-connection. We get the session via the \user object and can now
1071 * start the session thread, link it into the global session list and
1072 * schedule HID/input device registration.
1073 * The global session-list owns its own reference to the session object so you
1074 * can drop your own reference after registering the l2cap_user object.
1075 */
1076static int hidp_session_probe(struct l2cap_conn *conn,
1077 struct l2cap_user *user)
1078{
1079 struct hidp_session *session = container_of(user,
1080 struct hidp_session,
1081 user);
1082 struct hidp_session *s;
1083 int ret;
1084
1085 down_write(&hidp_session_sem);
1086
1087 /* check that no other session for this device exists */
1088 s = __hidp_session_find(&session->bdaddr);
1089 if (s) {
1090 ret = -EEXIST;
1091 goto out_unlock;
1092 }
1093
1094 if (session->input) {
1095 ret = hidp_session_dev_add(session);
1096 if (ret)
1097 goto out_unlock;
1098 }
1099
1100 ret = hidp_session_start_sync(session);
1101 if (ret)
1102 goto out_del;
1103
1104 /* HID device registration is async to allow I/O during probe */
1105 if (session->input)
1106 atomic_inc(&session->state);
1107 else
1108 schedule_work(&session->dev_init);
1109
1110 hidp_session_get(session);
1111 list_add(&session->list, &hidp_session_list);
1112 ret = 0;
1113 goto out_unlock;
1114
1115out_del:
1116 if (session->input)
1117 hidp_session_dev_del(session);
1118out_unlock:
1119 up_write(&hidp_session_sem);
1120 return ret;
1121}
1122
1123/*
1124 * Remove HIDP session
1125 * Called from the l2cap_conn core when either we explicitly unregistered
1126 * the l2cap_user object or if the underlying connection is shut down.
1127 * We signal the hidp-session thread to shut down, unregister the HID/input
1128 * devices and unlink the session from the global list.
1129 * This drops the reference to the session that is owned by the global
1130 * session-list.
1131 * Note: We _must_ not synchronosly wait for the session-thread to shut down.
1132 * This is, because the session-thread might be waiting for an HCI lock that is
1133 * held while we are called. Therefore, we only unregister the devices and
1134 * notify the session-thread to terminate. The thread itself owns a reference
1135 * to the session object so it can safely shut down.
1136 */
1137static void hidp_session_remove(struct l2cap_conn *conn,
1138 struct l2cap_user *user)
1139{
1140 struct hidp_session *session = container_of(user,
1141 struct hidp_session,
1142 user);
1143
1144 down_write(&hidp_session_sem);
1145
1146 hidp_session_terminate(session);
1147
1148 cancel_work_sync(&session->dev_init);
1149 if (session->input ||
1150 atomic_read(&session->state) > HIDP_SESSION_PREPARING)
1151 hidp_session_dev_del(session);
1152
1153 list_del(&session->list);
1154
1155 up_write(&hidp_session_sem);
1156
1157 hidp_session_put(session);
1158}
1159
1160/*
1161 * Session Worker
1162 * This performs the actual main-loop of the HIDP worker. We first check
1163 * whether the underlying connection is still alive, then parse all pending
1164 * messages and finally send all outstanding messages.
1165 */
1166static void hidp_session_run(struct hidp_session *session)
1167{
1168 struct sock *ctrl_sk = session->ctrl_sock->sk;
1169 struct sock *intr_sk = session->intr_sock->sk;
1170 struct sk_buff *skb;
1171
1172 for (;;) {
1173 /*
1174 * This thread can be woken up two ways:
1175 * - You call hidp_session_terminate() which sets the
1176 * session->terminate flag and wakes this thread up.
1177 * - Via modifying the socket state of ctrl/intr_sock. This
1178 * thread is woken up by ->sk_state_changed().
1179 *
1180 * Note: set_current_state() performs any necessary
1181 * memory-barriers for us.
1182 */
1183 set_current_state(TASK_INTERRUPTIBLE);
1184
1185 if (atomic_read(&session->terminate))
1186 break;
1187
1188 if (ctrl_sk->sk_state != BT_CONNECTED ||
1189 intr_sk->sk_state != BT_CONNECTED)
1190 break;
1191
1192 /* parse incoming intr-skbs */
1193 while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
1194 skb_orphan(skb);
1195 if (!skb_linearize(skb))
1196 hidp_recv_intr_frame(session, skb);
1197 else
1198 kfree_skb(skb);
1199 }
1200
1201 /* send pending intr-skbs */
1202 hidp_process_transmit(session, &session->intr_transmit,
1203 session->intr_sock);
1204
1205 /* parse incoming ctrl-skbs */
1206 while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
1207 skb_orphan(skb);
1208 if (!skb_linearize(skb))
1209 hidp_recv_ctrl_frame(session, skb);
1210 else
1211 kfree_skb(skb);
1212 }
1213
1214 /* send pending ctrl-skbs */
1215 hidp_process_transmit(session, &session->ctrl_transmit,
1216 session->ctrl_sock);
1217
1218 schedule();
1219 }
1220
1221 atomic_inc(&session->terminate);
1222 set_current_state(TASK_RUNNING);
1223}
1224
1225/*
1226 * HIDP session thread
1227 * This thread runs the I/O for a single HIDP session. Startup is synchronous
1228 * which allows us to take references to ourself here instead of doing that in
1229 * the caller.
1230 * When we are ready to run we notify the caller and call hidp_session_run().
1231 */
1232static int hidp_session_thread(void *arg)
1233{
1234 struct hidp_session *session = arg;
1235 wait_queue_t ctrl_wait, intr_wait;
1236
1237 BT_DBG("session %p", session);
1238
1239 /* initialize runtime environment */
1240 hidp_session_get(session);
1241 __module_get(THIS_MODULE);
1242 set_user_nice(current, -15);
1243 hidp_set_timer(session);
1244
1245 init_waitqueue_entry(&ctrl_wait, current);
1246 init_waitqueue_entry(&intr_wait, current);
1247 add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait);
1248 add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1249 /* This memory barrier is paired with wq_has_sleeper(). See
1250 * sock_poll_wait() for more information why this is needed. */
1251 smp_mb();
1252
1253 /* notify synchronous startup that we're ready */
1254 atomic_inc(&session->state);
1255 wake_up(&session->state_queue);
1256
1257 /* run session */
1258 hidp_session_run(session);
1259
1260 /* cleanup runtime environment */
1261 remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1262 remove_wait_queue(sk_sleep(session->intr_sock->sk), &ctrl_wait);
1263 wake_up_interruptible(&session->report_queue);
1264 hidp_del_timer(session);
1265
1266 /*
1267 * If we stopped ourself due to any internal signal, we should try to
1268 * unregister our own session here to avoid having it linger until the
1269 * parent l2cap_conn dies or user-space cleans it up.
1270 * This does not deadlock as we don't do any synchronous shutdown.
1271 * Instead, this call has the same semantics as if user-space tried to
1272 * delete the session.
1273 */
1274 l2cap_unregister_user(session->conn, &session->user);
1275 hidp_session_put(session);
1276
1277 module_put_and_exit(0);
1278 return 0;
1279}
1280
1281static int hidp_verify_sockets(struct socket *ctrl_sock,
1282 struct socket *intr_sock)
1283{
1284 struct l2cap_chan *ctrl_chan, *intr_chan;
1285 struct bt_sock *ctrl, *intr;
1286 struct hidp_session *session;
1287
1288 if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock))
1289 return -EINVAL;
1290
1291 ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan;
1292 intr_chan = l2cap_pi(intr_sock->sk)->chan;
1293
1294 if (bacmp(&ctrl_chan->src, &intr_chan->src) ||
1295 bacmp(&ctrl_chan->dst, &intr_chan->dst))
1296 return -ENOTUNIQ;
1297
1298 ctrl = bt_sk(ctrl_sock->sk);
1299 intr = bt_sk(intr_sock->sk);
1300
1301 if (ctrl->sk.sk_state != BT_CONNECTED ||
1302 intr->sk.sk_state != BT_CONNECTED)
1303 return -EBADFD;
1304
1305 /* early session check, we check again during session registration */
1306 session = hidp_session_find(&ctrl_chan->dst);
1307 if (session) {
1308 hidp_session_put(session);
1309 return -EEXIST;
1310 }
1311
1312 return 0;
1313}
1314
1315int hidp_connection_add(struct hidp_connadd_req *req,
1316 struct socket *ctrl_sock,
1317 struct socket *intr_sock)
1318{
1319 struct hidp_session *session;
1320 struct l2cap_conn *conn;
1321 struct l2cap_chan *chan = l2cap_pi(ctrl_sock->sk)->chan;
1322 int ret;
1323
1324 ret = hidp_verify_sockets(ctrl_sock, intr_sock);
1325 if (ret)
1326 return ret;
1327
1328 conn = NULL;
1329 l2cap_chan_lock(chan);
1330 if (chan->conn) {
1331 l2cap_conn_get(chan->conn);
1332 conn = chan->conn;
1333 }
1334 l2cap_chan_unlock(chan);
1335
1336 if (!conn)
1337 return -EBADFD;
1338
1339 ret = hidp_session_new(&session, &chan->dst, ctrl_sock,
1340 intr_sock, req, conn);
1341 if (ret)
1342 goto out_conn;
1343
1344 ret = l2cap_register_user(conn, &session->user);
1345 if (ret)
1346 goto out_session;
1347
1348 ret = 0;
1349
1350out_session:
1351 hidp_session_put(session);
1352out_conn:
1353 l2cap_conn_put(conn);
1354 return ret;
1355}
1356
1357int hidp_connection_del(struct hidp_conndel_req *req)
1358{
1359 struct hidp_session *session;
1360
1361 session = hidp_session_find(&req->bdaddr);
1362 if (!session)
1363 return -ENOENT;
1364
1365 if (req->flags & (1 << HIDP_VIRTUAL_CABLE_UNPLUG))
1366 hidp_send_ctrl_message(session,
1367 HIDP_TRANS_HID_CONTROL |
1368 HIDP_CTRL_VIRTUAL_CABLE_UNPLUG,
1369 NULL, 0);
1370 else
1371 l2cap_unregister_user(session->conn, &session->user);
1372
1373 hidp_session_put(session);
1374
1375 return 0;
1376}
1377
1378int hidp_get_connlist(struct hidp_connlist_req *req)
1379{
1380 struct hidp_session *session;
1381 int err = 0, n = 0;
1382
1383 BT_DBG("");
1384
1385 down_read(&hidp_session_sem);
1386
1387 list_for_each_entry(session, &hidp_session_list, list) {
1388 struct hidp_conninfo ci;
1389
1390 hidp_copy_session(session, &ci);
1391
1392 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
1393 err = -EFAULT;
1394 break;
1395 }
1396
1397 if (++n >= req->cnum)
1398 break;
1399
1400 req->ci++;
1401 }
1402 req->cnum = n;
1403
1404 up_read(&hidp_session_sem);
1405 return err;
1406}
1407
1408int hidp_get_conninfo(struct hidp_conninfo *ci)
1409{
1410 struct hidp_session *session;
1411
1412 session = hidp_session_find(&ci->bdaddr);
1413 if (session) {
1414 hidp_copy_session(session, ci);
1415 hidp_session_put(session);
1416 }
1417
1418 return session ? 0 : -ENOENT;
1419}
1420
1421static int __init hidp_init(void)
1422{
1423 BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);
1424
1425 return hidp_init_sockets();
1426}
1427
1428static void __exit hidp_exit(void)
1429{
1430 hidp_cleanup_sockets();
1431}
1432
1433module_init(hidp_init);
1434module_exit(hidp_exit);
1435
1436MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1437MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
1438MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
1439MODULE_VERSION(VERSION);
1440MODULE_LICENSE("GPL");
1441MODULE_ALIAS("bt-proto-6");