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1/*
2 HIDP implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org>
4 Copyright (C) 2013 David Herrmann <dh.herrmann@gmail.com>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License version 2 as
8 published by the Free Software Foundation;
9
10 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
11 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
12 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
13 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
14 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
15 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18
19 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
20 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
21 SOFTWARE IS DISCLAIMED.
22*/
23
24#include <linux/kref.h>
25#include <linux/module.h>
26#include <linux/file.h>
27#include <linux/kthread.h>
28#include <linux/hidraw.h>
29
30#include <net/bluetooth/bluetooth.h>
31#include <net/bluetooth/hci_core.h>
32#include <net/bluetooth/l2cap.h>
33
34#include "hidp.h"
35
36#define VERSION "1.2"
37
38static DECLARE_RWSEM(hidp_session_sem);
39static DECLARE_WAIT_QUEUE_HEAD(hidp_session_wq);
40static LIST_HEAD(hidp_session_list);
41
42static unsigned char hidp_keycode[256] = {
43 0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36,
44 37, 38, 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45,
45 21, 44, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 28, 1,
46 14, 15, 57, 12, 13, 26, 27, 43, 43, 39, 40, 41, 51, 52,
47 53, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 87, 88,
48 99, 70, 119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103, 69,
49 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71, 72, 73,
50 82, 83, 86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189, 190,
51 191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135,
52 136, 113, 115, 114, 0, 0, 0, 121, 0, 89, 93, 124, 92, 94,
53 95, 0, 0, 0, 122, 123, 90, 91, 85, 0, 0, 0, 0, 0,
54 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
55 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
56 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
57 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
58 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
59 29, 42, 56, 125, 97, 54, 100, 126, 164, 166, 165, 163, 161, 115,
60 114, 113, 150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140
61};
62
63static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 };
64
65static int hidp_session_probe(struct l2cap_conn *conn,
66 struct l2cap_user *user);
67static void hidp_session_remove(struct l2cap_conn *conn,
68 struct l2cap_user *user);
69static int hidp_session_thread(void *arg);
70static void hidp_session_terminate(struct hidp_session *s);
71
72static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
73{
74 u32 valid_flags = 0;
75 memset(ci, 0, sizeof(*ci));
76 bacpy(&ci->bdaddr, &session->bdaddr);
77
78 ci->flags = session->flags & valid_flags;
79 ci->state = BT_CONNECTED;
80
81 if (session->input) {
82 ci->vendor = session->input->id.vendor;
83 ci->product = session->input->id.product;
84 ci->version = session->input->id.version;
85 if (session->input->name)
86 strlcpy(ci->name, session->input->name, 128);
87 else
88 strlcpy(ci->name, "HID Boot Device", 128);
89 } else if (session->hid) {
90 ci->vendor = session->hid->vendor;
91 ci->product = session->hid->product;
92 ci->version = session->hid->version;
93 strlcpy(ci->name, session->hid->name, 128);
94 }
95}
96
97/* assemble skb, queue message on @transmit and wake up the session thread */
98static int hidp_send_message(struct hidp_session *session, struct socket *sock,
99 struct sk_buff_head *transmit, unsigned char hdr,
100 const unsigned char *data, int size)
101{
102 struct sk_buff *skb;
103 struct sock *sk = sock->sk;
104 int ret;
105
106 BT_DBG("session %p data %p size %d", session, data, size);
107
108 if (atomic_read(&session->terminate))
109 return -EIO;
110
111 skb = alloc_skb(size + 1, GFP_ATOMIC);
112 if (!skb) {
113 BT_ERR("Can't allocate memory for new frame");
114 return -ENOMEM;
115 }
116
117 skb_put_u8(skb, hdr);
118 if (data && size > 0) {
119 skb_put_data(skb, data, size);
120 ret = size;
121 } else {
122 ret = 0;
123 }
124
125 skb_queue_tail(transmit, skb);
126 wake_up_interruptible(sk_sleep(sk));
127
128 return ret;
129}
130
131static int hidp_send_ctrl_message(struct hidp_session *session,
132 unsigned char hdr, const unsigned char *data,
133 int size)
134{
135 return hidp_send_message(session, session->ctrl_sock,
136 &session->ctrl_transmit, hdr, data, size);
137}
138
139static int hidp_send_intr_message(struct hidp_session *session,
140 unsigned char hdr, const unsigned char *data,
141 int size)
142{
143 return hidp_send_message(session, session->intr_sock,
144 &session->intr_transmit, hdr, data, size);
145}
146
147static int hidp_input_event(struct input_dev *dev, unsigned int type,
148 unsigned int code, int value)
149{
150 struct hidp_session *session = input_get_drvdata(dev);
151 unsigned char newleds;
152 unsigned char hdr, data[2];
153
154 BT_DBG("session %p type %d code %d value %d",
155 session, type, code, value);
156
157 if (type != EV_LED)
158 return -1;
159
160 newleds = (!!test_bit(LED_KANA, dev->led) << 3) |
161 (!!test_bit(LED_COMPOSE, dev->led) << 3) |
162 (!!test_bit(LED_SCROLLL, dev->led) << 2) |
163 (!!test_bit(LED_CAPSL, dev->led) << 1) |
164 (!!test_bit(LED_NUML, dev->led) << 0);
165
166 if (session->leds == newleds)
167 return 0;
168
169 session->leds = newleds;
170
171 hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
172 data[0] = 0x01;
173 data[1] = newleds;
174
175 return hidp_send_intr_message(session, hdr, data, 2);
176}
177
178static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb)
179{
180 struct input_dev *dev = session->input;
181 unsigned char *keys = session->keys;
182 unsigned char *udata = skb->data + 1;
183 signed char *sdata = skb->data + 1;
184 int i, size = skb->len - 1;
185
186 switch (skb->data[0]) {
187 case 0x01: /* Keyboard report */
188 for (i = 0; i < 8; i++)
189 input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1);
190
191 /* If all the key codes have been set to 0x01, it means
192 * too many keys were pressed at the same time. */
193 if (!memcmp(udata + 2, hidp_mkeyspat, 6))
194 break;
195
196 for (i = 2; i < 8; i++) {
197 if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) {
198 if (hidp_keycode[keys[i]])
199 input_report_key(dev, hidp_keycode[keys[i]], 0);
200 else
201 BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
202 }
203
204 if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) {
205 if (hidp_keycode[udata[i]])
206 input_report_key(dev, hidp_keycode[udata[i]], 1);
207 else
208 BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]);
209 }
210 }
211
212 memcpy(keys, udata, 8);
213 break;
214
215 case 0x02: /* Mouse report */
216 input_report_key(dev, BTN_LEFT, sdata[0] & 0x01);
217 input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02);
218 input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04);
219 input_report_key(dev, BTN_SIDE, sdata[0] & 0x08);
220 input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10);
221
222 input_report_rel(dev, REL_X, sdata[1]);
223 input_report_rel(dev, REL_Y, sdata[2]);
224
225 if (size > 3)
226 input_report_rel(dev, REL_WHEEL, sdata[3]);
227 break;
228 }
229
230 input_sync(dev);
231}
232
233static int hidp_get_raw_report(struct hid_device *hid,
234 unsigned char report_number,
235 unsigned char *data, size_t count,
236 unsigned char report_type)
237{
238 struct hidp_session *session = hid->driver_data;
239 struct sk_buff *skb;
240 size_t len;
241 int numbered_reports = hid->report_enum[report_type].numbered;
242 int ret;
243
244 if (atomic_read(&session->terminate))
245 return -EIO;
246
247 switch (report_type) {
248 case HID_FEATURE_REPORT:
249 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE;
250 break;
251 case HID_INPUT_REPORT:
252 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT;
253 break;
254 case HID_OUTPUT_REPORT:
255 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT;
256 break;
257 default:
258 return -EINVAL;
259 }
260
261 if (mutex_lock_interruptible(&session->report_mutex))
262 return -ERESTARTSYS;
263
264 /* Set up our wait, and send the report request to the device. */
265 session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK;
266 session->waiting_report_number = numbered_reports ? report_number : -1;
267 set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
268 data[0] = report_number;
269 ret = hidp_send_ctrl_message(session, report_type, data, 1);
270 if (ret < 0)
271 goto err;
272
273 /* Wait for the return of the report. The returned report
274 gets put in session->report_return. */
275 while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
276 !atomic_read(&session->terminate)) {
277 int res;
278
279 res = wait_event_interruptible_timeout(session->report_queue,
280 !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)
281 || atomic_read(&session->terminate),
282 5*HZ);
283 if (res == 0) {
284 /* timeout */
285 ret = -EIO;
286 goto err;
287 }
288 if (res < 0) {
289 /* signal */
290 ret = -ERESTARTSYS;
291 goto err;
292 }
293 }
294
295 skb = session->report_return;
296 if (skb) {
297 len = skb->len < count ? skb->len : count;
298 memcpy(data, skb->data, len);
299
300 kfree_skb(skb);
301 session->report_return = NULL;
302 } else {
303 /* Device returned a HANDSHAKE, indicating protocol error. */
304 len = -EIO;
305 }
306
307 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
308 mutex_unlock(&session->report_mutex);
309
310 return len;
311
312err:
313 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
314 mutex_unlock(&session->report_mutex);
315 return ret;
316}
317
318static int hidp_set_raw_report(struct hid_device *hid, unsigned char reportnum,
319 unsigned char *data, size_t count,
320 unsigned char report_type)
321{
322 struct hidp_session *session = hid->driver_data;
323 int ret;
324
325 switch (report_type) {
326 case HID_FEATURE_REPORT:
327 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE;
328 break;
329 case HID_INPUT_REPORT:
330 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_INPUT;
331 break;
332 case HID_OUTPUT_REPORT:
333 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT;
334 break;
335 default:
336 return -EINVAL;
337 }
338
339 if (mutex_lock_interruptible(&session->report_mutex))
340 return -ERESTARTSYS;
341
342 /* Set up our wait, and send the report request to the device. */
343 data[0] = reportnum;
344 set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
345 ret = hidp_send_ctrl_message(session, report_type, data, count);
346 if (ret < 0)
347 goto err;
348
349 /* Wait for the ACK from the device. */
350 while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) &&
351 !atomic_read(&session->terminate)) {
352 int res;
353
354 res = wait_event_interruptible_timeout(session->report_queue,
355 !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)
356 || atomic_read(&session->terminate),
357 10*HZ);
358 if (res == 0) {
359 /* timeout */
360 ret = -EIO;
361 goto err;
362 }
363 if (res < 0) {
364 /* signal */
365 ret = -ERESTARTSYS;
366 goto err;
367 }
368 }
369
370 if (!session->output_report_success) {
371 ret = -EIO;
372 goto err;
373 }
374
375 ret = count;
376
377err:
378 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
379 mutex_unlock(&session->report_mutex);
380 return ret;
381}
382
383static int hidp_output_report(struct hid_device *hid, __u8 *data, size_t count)
384{
385 struct hidp_session *session = hid->driver_data;
386
387 return hidp_send_intr_message(session,
388 HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT,
389 data, count);
390}
391
392static int hidp_raw_request(struct hid_device *hid, unsigned char reportnum,
393 __u8 *buf, size_t len, unsigned char rtype,
394 int reqtype)
395{
396 switch (reqtype) {
397 case HID_REQ_GET_REPORT:
398 return hidp_get_raw_report(hid, reportnum, buf, len, rtype);
399 case HID_REQ_SET_REPORT:
400 return hidp_set_raw_report(hid, reportnum, buf, len, rtype);
401 default:
402 return -EIO;
403 }
404}
405
406static void hidp_idle_timeout(struct timer_list *t)
407{
408 struct hidp_session *session = from_timer(session, t, timer);
409
410 /* The HIDP user-space API only contains calls to add and remove
411 * devices. There is no way to forward events of any kind. Therefore,
412 * we have to forcefully disconnect a device on idle-timeouts. This is
413 * unfortunate and weird API design, but it is spec-compliant and
414 * required for backwards-compatibility. Hence, on idle-timeout, we
415 * signal driver-detach events, so poll() will be woken up with an
416 * error-condition on both sockets.
417 */
418
419 session->intr_sock->sk->sk_err = EUNATCH;
420 session->ctrl_sock->sk->sk_err = EUNATCH;
421 wake_up_interruptible(sk_sleep(session->intr_sock->sk));
422 wake_up_interruptible(sk_sleep(session->ctrl_sock->sk));
423
424 hidp_session_terminate(session);
425}
426
427static void hidp_set_timer(struct hidp_session *session)
428{
429 if (session->idle_to > 0)
430 mod_timer(&session->timer, jiffies + HZ * session->idle_to);
431}
432
433static void hidp_del_timer(struct hidp_session *session)
434{
435 if (session->idle_to > 0)
436 del_timer(&session->timer);
437}
438
439static void hidp_process_report(struct hidp_session *session, int type,
440 const u8 *data, unsigned int len, int intr)
441{
442 if (len > HID_MAX_BUFFER_SIZE)
443 len = HID_MAX_BUFFER_SIZE;
444
445 memcpy(session->input_buf, data, len);
446 hid_input_report(session->hid, type, session->input_buf, len, intr);
447}
448
449static void hidp_process_handshake(struct hidp_session *session,
450 unsigned char param)
451{
452 BT_DBG("session %p param 0x%02x", session, param);
453 session->output_report_success = 0; /* default condition */
454
455 switch (param) {
456 case HIDP_HSHK_SUCCESSFUL:
457 /* FIXME: Call into SET_ GET_ handlers here */
458 session->output_report_success = 1;
459 break;
460
461 case HIDP_HSHK_NOT_READY:
462 case HIDP_HSHK_ERR_INVALID_REPORT_ID:
463 case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST:
464 case HIDP_HSHK_ERR_INVALID_PARAMETER:
465 if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags))
466 wake_up_interruptible(&session->report_queue);
467
468 /* FIXME: Call into SET_ GET_ handlers here */
469 break;
470
471 case HIDP_HSHK_ERR_UNKNOWN:
472 break;
473
474 case HIDP_HSHK_ERR_FATAL:
475 /* Device requests a reboot, as this is the only way this error
476 * can be recovered. */
477 hidp_send_ctrl_message(session,
478 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0);
479 break;
480
481 default:
482 hidp_send_ctrl_message(session,
483 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
484 break;
485 }
486
487 /* Wake up the waiting thread. */
488 if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags))
489 wake_up_interruptible(&session->report_queue);
490}
491
492static void hidp_process_hid_control(struct hidp_session *session,
493 unsigned char param)
494{
495 BT_DBG("session %p param 0x%02x", session, param);
496
497 if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) {
498 /* Flush the transmit queues */
499 skb_queue_purge(&session->ctrl_transmit);
500 skb_queue_purge(&session->intr_transmit);
501
502 hidp_session_terminate(session);
503 }
504}
505
506/* Returns true if the passed-in skb should be freed by the caller. */
507static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb,
508 unsigned char param)
509{
510 int done_with_skb = 1;
511 BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param);
512
513 switch (param) {
514 case HIDP_DATA_RTYPE_INPUT:
515 hidp_set_timer(session);
516
517 if (session->input)
518 hidp_input_report(session, skb);
519
520 if (session->hid)
521 hidp_process_report(session, HID_INPUT_REPORT,
522 skb->data, skb->len, 0);
523 break;
524
525 case HIDP_DATA_RTYPE_OTHER:
526 case HIDP_DATA_RTYPE_OUPUT:
527 case HIDP_DATA_RTYPE_FEATURE:
528 break;
529
530 default:
531 hidp_send_ctrl_message(session,
532 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
533 }
534
535 if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
536 param == session->waiting_report_type) {
537 if (session->waiting_report_number < 0 ||
538 session->waiting_report_number == skb->data[0]) {
539 /* hidp_get_raw_report() is waiting on this report. */
540 session->report_return = skb;
541 done_with_skb = 0;
542 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
543 wake_up_interruptible(&session->report_queue);
544 }
545 }
546
547 return done_with_skb;
548}
549
550static void hidp_recv_ctrl_frame(struct hidp_session *session,
551 struct sk_buff *skb)
552{
553 unsigned char hdr, type, param;
554 int free_skb = 1;
555
556 BT_DBG("session %p skb %p len %d", session, skb, skb->len);
557
558 hdr = skb->data[0];
559 skb_pull(skb, 1);
560
561 type = hdr & HIDP_HEADER_TRANS_MASK;
562 param = hdr & HIDP_HEADER_PARAM_MASK;
563
564 switch (type) {
565 case HIDP_TRANS_HANDSHAKE:
566 hidp_process_handshake(session, param);
567 break;
568
569 case HIDP_TRANS_HID_CONTROL:
570 hidp_process_hid_control(session, param);
571 break;
572
573 case HIDP_TRANS_DATA:
574 free_skb = hidp_process_data(session, skb, param);
575 break;
576
577 default:
578 hidp_send_ctrl_message(session,
579 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0);
580 break;
581 }
582
583 if (free_skb)
584 kfree_skb(skb);
585}
586
587static void hidp_recv_intr_frame(struct hidp_session *session,
588 struct sk_buff *skb)
589{
590 unsigned char hdr;
591
592 BT_DBG("session %p skb %p len %d", session, skb, skb->len);
593
594 hdr = skb->data[0];
595 skb_pull(skb, 1);
596
597 if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) {
598 hidp_set_timer(session);
599
600 if (session->input)
601 hidp_input_report(session, skb);
602
603 if (session->hid) {
604 hidp_process_report(session, HID_INPUT_REPORT,
605 skb->data, skb->len, 1);
606 BT_DBG("report len %d", skb->len);
607 }
608 } else {
609 BT_DBG("Unsupported protocol header 0x%02x", hdr);
610 }
611
612 kfree_skb(skb);
613}
614
615static int hidp_send_frame(struct socket *sock, unsigned char *data, int len)
616{
617 struct kvec iv = { data, len };
618 struct msghdr msg;
619
620 BT_DBG("sock %p data %p len %d", sock, data, len);
621
622 if (!len)
623 return 0;
624
625 memset(&msg, 0, sizeof(msg));
626
627 return kernel_sendmsg(sock, &msg, &iv, 1, len);
628}
629
630/* dequeue message from @transmit and send via @sock */
631static void hidp_process_transmit(struct hidp_session *session,
632 struct sk_buff_head *transmit,
633 struct socket *sock)
634{
635 struct sk_buff *skb;
636 int ret;
637
638 BT_DBG("session %p", session);
639
640 while ((skb = skb_dequeue(transmit))) {
641 ret = hidp_send_frame(sock, skb->data, skb->len);
642 if (ret == -EAGAIN) {
643 skb_queue_head(transmit, skb);
644 break;
645 } else if (ret < 0) {
646 hidp_session_terminate(session);
647 kfree_skb(skb);
648 break;
649 }
650
651 hidp_set_timer(session);
652 kfree_skb(skb);
653 }
654}
655
656static int hidp_setup_input(struct hidp_session *session,
657 const struct hidp_connadd_req *req)
658{
659 struct input_dev *input;
660 int i;
661
662 input = input_allocate_device();
663 if (!input)
664 return -ENOMEM;
665
666 session->input = input;
667
668 input_set_drvdata(input, session);
669
670 input->name = "Bluetooth HID Boot Protocol Device";
671
672 input->id.bustype = BUS_BLUETOOTH;
673 input->id.vendor = req->vendor;
674 input->id.product = req->product;
675 input->id.version = req->version;
676
677 if (req->subclass & 0x40) {
678 set_bit(EV_KEY, input->evbit);
679 set_bit(EV_LED, input->evbit);
680 set_bit(EV_REP, input->evbit);
681
682 set_bit(LED_NUML, input->ledbit);
683 set_bit(LED_CAPSL, input->ledbit);
684 set_bit(LED_SCROLLL, input->ledbit);
685 set_bit(LED_COMPOSE, input->ledbit);
686 set_bit(LED_KANA, input->ledbit);
687
688 for (i = 0; i < sizeof(hidp_keycode); i++)
689 set_bit(hidp_keycode[i], input->keybit);
690 clear_bit(0, input->keybit);
691 }
692
693 if (req->subclass & 0x80) {
694 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
695 input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
696 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
697 input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
698 input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
699 BIT_MASK(BTN_EXTRA);
700 input->relbit[0] |= BIT_MASK(REL_WHEEL);
701 }
702
703 input->dev.parent = &session->conn->hcon->dev;
704
705 input->event = hidp_input_event;
706
707 return 0;
708}
709
710static int hidp_open(struct hid_device *hid)
711{
712 return 0;
713}
714
715static void hidp_close(struct hid_device *hid)
716{
717}
718
719static int hidp_parse(struct hid_device *hid)
720{
721 struct hidp_session *session = hid->driver_data;
722
723 return hid_parse_report(session->hid, session->rd_data,
724 session->rd_size);
725}
726
727static int hidp_start(struct hid_device *hid)
728{
729 return 0;
730}
731
732static void hidp_stop(struct hid_device *hid)
733{
734 struct hidp_session *session = hid->driver_data;
735
736 skb_queue_purge(&session->ctrl_transmit);
737 skb_queue_purge(&session->intr_transmit);
738
739 hid->claimed = 0;
740}
741
742struct hid_ll_driver hidp_hid_driver = {
743 .parse = hidp_parse,
744 .start = hidp_start,
745 .stop = hidp_stop,
746 .open = hidp_open,
747 .close = hidp_close,
748 .raw_request = hidp_raw_request,
749 .output_report = hidp_output_report,
750};
751EXPORT_SYMBOL_GPL(hidp_hid_driver);
752
753/* This function sets up the hid device. It does not add it
754 to the HID system. That is done in hidp_add_connection(). */
755static int hidp_setup_hid(struct hidp_session *session,
756 const struct hidp_connadd_req *req)
757{
758 struct hid_device *hid;
759 int err;
760
761 session->rd_data = memdup_user(req->rd_data, req->rd_size);
762 if (IS_ERR(session->rd_data))
763 return PTR_ERR(session->rd_data);
764
765 session->rd_size = req->rd_size;
766
767 hid = hid_allocate_device();
768 if (IS_ERR(hid)) {
769 err = PTR_ERR(hid);
770 goto fault;
771 }
772
773 session->hid = hid;
774
775 hid->driver_data = session;
776
777 hid->bus = BUS_BLUETOOTH;
778 hid->vendor = req->vendor;
779 hid->product = req->product;
780 hid->version = req->version;
781 hid->country = req->country;
782
783 strscpy(hid->name, req->name, sizeof(hid->name));
784
785 snprintf(hid->phys, sizeof(hid->phys), "%pMR",
786 &l2cap_pi(session->ctrl_sock->sk)->chan->src);
787
788 /* NOTE: Some device modules depend on the dst address being stored in
789 * uniq. Please be aware of this before making changes to this behavior.
790 */
791 snprintf(hid->uniq, sizeof(hid->uniq), "%pMR",
792 &l2cap_pi(session->ctrl_sock->sk)->chan->dst);
793
794 hid->dev.parent = &session->conn->hcon->dev;
795 hid->ll_driver = &hidp_hid_driver;
796
797 /* True if device is blacklisted in drivers/hid/hid-quirks.c */
798 if (hid_ignore(hid)) {
799 hid_destroy_device(session->hid);
800 session->hid = NULL;
801 return -ENODEV;
802 }
803
804 return 0;
805
806fault:
807 kfree(session->rd_data);
808 session->rd_data = NULL;
809
810 return err;
811}
812
813/* initialize session devices */
814static int hidp_session_dev_init(struct hidp_session *session,
815 const struct hidp_connadd_req *req)
816{
817 int ret;
818
819 if (req->rd_size > 0) {
820 ret = hidp_setup_hid(session, req);
821 if (ret && ret != -ENODEV)
822 return ret;
823 }
824
825 if (!session->hid) {
826 ret = hidp_setup_input(session, req);
827 if (ret < 0)
828 return ret;
829 }
830
831 return 0;
832}
833
834/* destroy session devices */
835static void hidp_session_dev_destroy(struct hidp_session *session)
836{
837 if (session->hid)
838 put_device(&session->hid->dev);
839 else if (session->input)
840 input_put_device(session->input);
841
842 kfree(session->rd_data);
843 session->rd_data = NULL;
844}
845
846/* add HID/input devices to their underlying bus systems */
847static int hidp_session_dev_add(struct hidp_session *session)
848{
849 int ret;
850
851 /* Both HID and input systems drop a ref-count when unregistering the
852 * device but they don't take a ref-count when registering them. Work
853 * around this by explicitly taking a refcount during registration
854 * which is dropped automatically by unregistering the devices. */
855
856 if (session->hid) {
857 ret = hid_add_device(session->hid);
858 if (ret)
859 return ret;
860 get_device(&session->hid->dev);
861 } else if (session->input) {
862 ret = input_register_device(session->input);
863 if (ret)
864 return ret;
865 input_get_device(session->input);
866 }
867
868 return 0;
869}
870
871/* remove HID/input devices from their bus systems */
872static void hidp_session_dev_del(struct hidp_session *session)
873{
874 if (session->hid)
875 hid_destroy_device(session->hid);
876 else if (session->input)
877 input_unregister_device(session->input);
878}
879
880/*
881 * Asynchronous device registration
882 * HID device drivers might want to perform I/O during initialization to
883 * detect device types. Therefore, call device registration in a separate
884 * worker so the HIDP thread can schedule I/O operations.
885 * Note that this must be called after the worker thread was initialized
886 * successfully. This will then add the devices and increase session state
887 * on success, otherwise it will terminate the session thread.
888 */
889static void hidp_session_dev_work(struct work_struct *work)
890{
891 struct hidp_session *session = container_of(work,
892 struct hidp_session,
893 dev_init);
894 int ret;
895
896 ret = hidp_session_dev_add(session);
897 if (!ret)
898 atomic_inc(&session->state);
899 else
900 hidp_session_terminate(session);
901}
902
903/*
904 * Create new session object
905 * Allocate session object, initialize static fields, copy input data into the
906 * object and take a reference to all sub-objects.
907 * This returns 0 on success and puts a pointer to the new session object in
908 * \out. Otherwise, an error code is returned.
909 * The new session object has an initial ref-count of 1.
910 */
911static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
912 struct socket *ctrl_sock,
913 struct socket *intr_sock,
914 const struct hidp_connadd_req *req,
915 struct l2cap_conn *conn)
916{
917 struct hidp_session *session;
918 int ret;
919 struct bt_sock *ctrl, *intr;
920
921 ctrl = bt_sk(ctrl_sock->sk);
922 intr = bt_sk(intr_sock->sk);
923
924 session = kzalloc(sizeof(*session), GFP_KERNEL);
925 if (!session)
926 return -ENOMEM;
927
928 /* object and runtime management */
929 kref_init(&session->ref);
930 atomic_set(&session->state, HIDP_SESSION_IDLING);
931 init_waitqueue_head(&session->state_queue);
932 session->flags = req->flags & BIT(HIDP_BLUETOOTH_VENDOR_ID);
933
934 /* connection management */
935 bacpy(&session->bdaddr, bdaddr);
936 session->conn = l2cap_conn_get(conn);
937 session->user.probe = hidp_session_probe;
938 session->user.remove = hidp_session_remove;
939 INIT_LIST_HEAD(&session->user.list);
940 session->ctrl_sock = ctrl_sock;
941 session->intr_sock = intr_sock;
942 skb_queue_head_init(&session->ctrl_transmit);
943 skb_queue_head_init(&session->intr_transmit);
944 session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu,
945 l2cap_pi(ctrl)->chan->imtu);
946 session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu,
947 l2cap_pi(intr)->chan->imtu);
948 session->idle_to = req->idle_to;
949
950 /* device management */
951 INIT_WORK(&session->dev_init, hidp_session_dev_work);
952 timer_setup(&session->timer, hidp_idle_timeout, 0);
953
954 /* session data */
955 mutex_init(&session->report_mutex);
956 init_waitqueue_head(&session->report_queue);
957
958 ret = hidp_session_dev_init(session, req);
959 if (ret)
960 goto err_free;
961
962 get_file(session->intr_sock->file);
963 get_file(session->ctrl_sock->file);
964 *out = session;
965 return 0;
966
967err_free:
968 l2cap_conn_put(session->conn);
969 kfree(session);
970 return ret;
971}
972
973/* increase ref-count of the given session by one */
974static void hidp_session_get(struct hidp_session *session)
975{
976 kref_get(&session->ref);
977}
978
979/* release callback */
980static void session_free(struct kref *ref)
981{
982 struct hidp_session *session = container_of(ref, struct hidp_session,
983 ref);
984
985 hidp_session_dev_destroy(session);
986 skb_queue_purge(&session->ctrl_transmit);
987 skb_queue_purge(&session->intr_transmit);
988 fput(session->intr_sock->file);
989 fput(session->ctrl_sock->file);
990 l2cap_conn_put(session->conn);
991 kfree(session);
992}
993
994/* decrease ref-count of the given session by one */
995static void hidp_session_put(struct hidp_session *session)
996{
997 kref_put(&session->ref, session_free);
998}
999
1000/*
1001 * Search the list of active sessions for a session with target address
1002 * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as
1003 * you do not release this lock, the session objects cannot vanish and you can
1004 * safely take a reference to the session yourself.
1005 */
1006static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr)
1007{
1008 struct hidp_session *session;
1009
1010 list_for_each_entry(session, &hidp_session_list, list) {
1011 if (!bacmp(bdaddr, &session->bdaddr))
1012 return session;
1013 }
1014
1015 return NULL;
1016}
1017
1018/*
1019 * Same as __hidp_session_find() but no locks must be held. This also takes a
1020 * reference of the returned session (if non-NULL) so you must drop this
1021 * reference if you no longer use the object.
1022 */
1023static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr)
1024{
1025 struct hidp_session *session;
1026
1027 down_read(&hidp_session_sem);
1028
1029 session = __hidp_session_find(bdaddr);
1030 if (session)
1031 hidp_session_get(session);
1032
1033 up_read(&hidp_session_sem);
1034
1035 return session;
1036}
1037
1038/*
1039 * Start session synchronously
1040 * This starts a session thread and waits until initialization
1041 * is done or returns an error if it couldn't be started.
1042 * If this returns 0 the session thread is up and running. You must call
1043 * hipd_session_stop_sync() before deleting any runtime resources.
1044 */
1045static int hidp_session_start_sync(struct hidp_session *session)
1046{
1047 unsigned int vendor, product;
1048
1049 if (session->hid) {
1050 vendor = session->hid->vendor;
1051 product = session->hid->product;
1052 } else if (session->input) {
1053 vendor = session->input->id.vendor;
1054 product = session->input->id.product;
1055 } else {
1056 vendor = 0x0000;
1057 product = 0x0000;
1058 }
1059
1060 session->task = kthread_run(hidp_session_thread, session,
1061 "khidpd_%04x%04x", vendor, product);
1062 if (IS_ERR(session->task))
1063 return PTR_ERR(session->task);
1064
1065 while (atomic_read(&session->state) <= HIDP_SESSION_IDLING)
1066 wait_event(session->state_queue,
1067 atomic_read(&session->state) > HIDP_SESSION_IDLING);
1068
1069 return 0;
1070}
1071
1072/*
1073 * Terminate session thread
1074 * Wake up session thread and notify it to stop. This is asynchronous and
1075 * returns immediately. Call this whenever a runtime error occurs and you want
1076 * the session to stop.
1077 * Note: wake_up_interruptible() performs any necessary memory-barriers for us.
1078 */
1079static void hidp_session_terminate(struct hidp_session *session)
1080{
1081 atomic_inc(&session->terminate);
1082 /*
1083 * See the comment preceding the call to wait_woken()
1084 * in hidp_session_run().
1085 */
1086 wake_up_interruptible(&hidp_session_wq);
1087}
1088
1089/*
1090 * Probe HIDP session
1091 * This is called from the l2cap_conn core when our l2cap_user object is bound
1092 * to the hci-connection. We get the session via the \user object and can now
1093 * start the session thread, link it into the global session list and
1094 * schedule HID/input device registration.
1095 * The global session-list owns its own reference to the session object so you
1096 * can drop your own reference after registering the l2cap_user object.
1097 */
1098static int hidp_session_probe(struct l2cap_conn *conn,
1099 struct l2cap_user *user)
1100{
1101 struct hidp_session *session = container_of(user,
1102 struct hidp_session,
1103 user);
1104 struct hidp_session *s;
1105 int ret;
1106
1107 down_write(&hidp_session_sem);
1108
1109 /* check that no other session for this device exists */
1110 s = __hidp_session_find(&session->bdaddr);
1111 if (s) {
1112 ret = -EEXIST;
1113 goto out_unlock;
1114 }
1115
1116 if (session->input) {
1117 ret = hidp_session_dev_add(session);
1118 if (ret)
1119 goto out_unlock;
1120 }
1121
1122 ret = hidp_session_start_sync(session);
1123 if (ret)
1124 goto out_del;
1125
1126 /* HID device registration is async to allow I/O during probe */
1127 if (session->input)
1128 atomic_inc(&session->state);
1129 else
1130 schedule_work(&session->dev_init);
1131
1132 hidp_session_get(session);
1133 list_add(&session->list, &hidp_session_list);
1134 ret = 0;
1135 goto out_unlock;
1136
1137out_del:
1138 if (session->input)
1139 hidp_session_dev_del(session);
1140out_unlock:
1141 up_write(&hidp_session_sem);
1142 return ret;
1143}
1144
1145/*
1146 * Remove HIDP session
1147 * Called from the l2cap_conn core when either we explicitly unregistered
1148 * the l2cap_user object or if the underlying connection is shut down.
1149 * We signal the hidp-session thread to shut down, unregister the HID/input
1150 * devices and unlink the session from the global list.
1151 * This drops the reference to the session that is owned by the global
1152 * session-list.
1153 * Note: We _must_ not synchronosly wait for the session-thread to shut down.
1154 * This is, because the session-thread might be waiting for an HCI lock that is
1155 * held while we are called. Therefore, we only unregister the devices and
1156 * notify the session-thread to terminate. The thread itself owns a reference
1157 * to the session object so it can safely shut down.
1158 */
1159static void hidp_session_remove(struct l2cap_conn *conn,
1160 struct l2cap_user *user)
1161{
1162 struct hidp_session *session = container_of(user,
1163 struct hidp_session,
1164 user);
1165
1166 down_write(&hidp_session_sem);
1167
1168 hidp_session_terminate(session);
1169
1170 cancel_work_sync(&session->dev_init);
1171 if (session->input ||
1172 atomic_read(&session->state) > HIDP_SESSION_PREPARING)
1173 hidp_session_dev_del(session);
1174
1175 list_del(&session->list);
1176
1177 up_write(&hidp_session_sem);
1178
1179 hidp_session_put(session);
1180}
1181
1182/*
1183 * Session Worker
1184 * This performs the actual main-loop of the HIDP worker. We first check
1185 * whether the underlying connection is still alive, then parse all pending
1186 * messages and finally send all outstanding messages.
1187 */
1188static void hidp_session_run(struct hidp_session *session)
1189{
1190 struct sock *ctrl_sk = session->ctrl_sock->sk;
1191 struct sock *intr_sk = session->intr_sock->sk;
1192 struct sk_buff *skb;
1193 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1194
1195 add_wait_queue(&hidp_session_wq, &wait);
1196 for (;;) {
1197 /*
1198 * This thread can be woken up two ways:
1199 * - You call hidp_session_terminate() which sets the
1200 * session->terminate flag and wakes this thread up.
1201 * - Via modifying the socket state of ctrl/intr_sock. This
1202 * thread is woken up by ->sk_state_changed().
1203 */
1204
1205 if (atomic_read(&session->terminate))
1206 break;
1207
1208 if (ctrl_sk->sk_state != BT_CONNECTED ||
1209 intr_sk->sk_state != BT_CONNECTED)
1210 break;
1211
1212 /* parse incoming intr-skbs */
1213 while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
1214 skb_orphan(skb);
1215 if (!skb_linearize(skb))
1216 hidp_recv_intr_frame(session, skb);
1217 else
1218 kfree_skb(skb);
1219 }
1220
1221 /* send pending intr-skbs */
1222 hidp_process_transmit(session, &session->intr_transmit,
1223 session->intr_sock);
1224
1225 /* parse incoming ctrl-skbs */
1226 while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
1227 skb_orphan(skb);
1228 if (!skb_linearize(skb))
1229 hidp_recv_ctrl_frame(session, skb);
1230 else
1231 kfree_skb(skb);
1232 }
1233
1234 /* send pending ctrl-skbs */
1235 hidp_process_transmit(session, &session->ctrl_transmit,
1236 session->ctrl_sock);
1237
1238 /*
1239 * wait_woken() performs the necessary memory barriers
1240 * for us; see the header comment for this primitive.
1241 */
1242 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
1243 }
1244 remove_wait_queue(&hidp_session_wq, &wait);
1245
1246 atomic_inc(&session->terminate);
1247}
1248
1249static int hidp_session_wake_function(wait_queue_entry_t *wait,
1250 unsigned int mode,
1251 int sync, void *key)
1252{
1253 wake_up_interruptible(&hidp_session_wq);
1254 return false;
1255}
1256
1257/*
1258 * HIDP session thread
1259 * This thread runs the I/O for a single HIDP session. Startup is synchronous
1260 * which allows us to take references to ourself here instead of doing that in
1261 * the caller.
1262 * When we are ready to run we notify the caller and call hidp_session_run().
1263 */
1264static int hidp_session_thread(void *arg)
1265{
1266 struct hidp_session *session = arg;
1267 DEFINE_WAIT_FUNC(ctrl_wait, hidp_session_wake_function);
1268 DEFINE_WAIT_FUNC(intr_wait, hidp_session_wake_function);
1269
1270 BT_DBG("session %p", session);
1271
1272 /* initialize runtime environment */
1273 hidp_session_get(session);
1274 __module_get(THIS_MODULE);
1275 set_user_nice(current, -15);
1276 hidp_set_timer(session);
1277
1278 add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait);
1279 add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1280 /* This memory barrier is paired with wq_has_sleeper(). See
1281 * sock_poll_wait() for more information why this is needed. */
1282 smp_mb();
1283
1284 /* notify synchronous startup that we're ready */
1285 atomic_inc(&session->state);
1286 wake_up(&session->state_queue);
1287
1288 /* run session */
1289 hidp_session_run(session);
1290
1291 /* cleanup runtime environment */
1292 remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1293 remove_wait_queue(sk_sleep(session->intr_sock->sk), &ctrl_wait);
1294 wake_up_interruptible(&session->report_queue);
1295 hidp_del_timer(session);
1296
1297 /*
1298 * If we stopped ourself due to any internal signal, we should try to
1299 * unregister our own session here to avoid having it linger until the
1300 * parent l2cap_conn dies or user-space cleans it up.
1301 * This does not deadlock as we don't do any synchronous shutdown.
1302 * Instead, this call has the same semantics as if user-space tried to
1303 * delete the session.
1304 */
1305 l2cap_unregister_user(session->conn, &session->user);
1306 hidp_session_put(session);
1307
1308 module_put_and_exit(0);
1309 return 0;
1310}
1311
1312static int hidp_verify_sockets(struct socket *ctrl_sock,
1313 struct socket *intr_sock)
1314{
1315 struct l2cap_chan *ctrl_chan, *intr_chan;
1316 struct bt_sock *ctrl, *intr;
1317 struct hidp_session *session;
1318
1319 if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock))
1320 return -EINVAL;
1321
1322 ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan;
1323 intr_chan = l2cap_pi(intr_sock->sk)->chan;
1324
1325 if (bacmp(&ctrl_chan->src, &intr_chan->src) ||
1326 bacmp(&ctrl_chan->dst, &intr_chan->dst))
1327 return -ENOTUNIQ;
1328
1329 ctrl = bt_sk(ctrl_sock->sk);
1330 intr = bt_sk(intr_sock->sk);
1331
1332 if (ctrl->sk.sk_state != BT_CONNECTED ||
1333 intr->sk.sk_state != BT_CONNECTED)
1334 return -EBADFD;
1335
1336 /* early session check, we check again during session registration */
1337 session = hidp_session_find(&ctrl_chan->dst);
1338 if (session) {
1339 hidp_session_put(session);
1340 return -EEXIST;
1341 }
1342
1343 return 0;
1344}
1345
1346int hidp_connection_add(const struct hidp_connadd_req *req,
1347 struct socket *ctrl_sock,
1348 struct socket *intr_sock)
1349{
1350 u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG) |
1351 BIT(HIDP_BOOT_PROTOCOL_MODE);
1352 struct hidp_session *session;
1353 struct l2cap_conn *conn;
1354 struct l2cap_chan *chan;
1355 int ret;
1356
1357 ret = hidp_verify_sockets(ctrl_sock, intr_sock);
1358 if (ret)
1359 return ret;
1360
1361 if (req->flags & ~valid_flags)
1362 return -EINVAL;
1363
1364 chan = l2cap_pi(ctrl_sock->sk)->chan;
1365 conn = NULL;
1366 l2cap_chan_lock(chan);
1367 if (chan->conn)
1368 conn = l2cap_conn_get(chan->conn);
1369 l2cap_chan_unlock(chan);
1370
1371 if (!conn)
1372 return -EBADFD;
1373
1374 ret = hidp_session_new(&session, &chan->dst, ctrl_sock,
1375 intr_sock, req, conn);
1376 if (ret)
1377 goto out_conn;
1378
1379 ret = l2cap_register_user(conn, &session->user);
1380 if (ret)
1381 goto out_session;
1382
1383 ret = 0;
1384
1385out_session:
1386 hidp_session_put(session);
1387out_conn:
1388 l2cap_conn_put(conn);
1389 return ret;
1390}
1391
1392int hidp_connection_del(struct hidp_conndel_req *req)
1393{
1394 u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG);
1395 struct hidp_session *session;
1396
1397 if (req->flags & ~valid_flags)
1398 return -EINVAL;
1399
1400 session = hidp_session_find(&req->bdaddr);
1401 if (!session)
1402 return -ENOENT;
1403
1404 if (req->flags & BIT(HIDP_VIRTUAL_CABLE_UNPLUG))
1405 hidp_send_ctrl_message(session,
1406 HIDP_TRANS_HID_CONTROL |
1407 HIDP_CTRL_VIRTUAL_CABLE_UNPLUG,
1408 NULL, 0);
1409 else
1410 l2cap_unregister_user(session->conn, &session->user);
1411
1412 hidp_session_put(session);
1413
1414 return 0;
1415}
1416
1417int hidp_get_connlist(struct hidp_connlist_req *req)
1418{
1419 struct hidp_session *session;
1420 int err = 0, n = 0;
1421
1422 BT_DBG("");
1423
1424 down_read(&hidp_session_sem);
1425
1426 list_for_each_entry(session, &hidp_session_list, list) {
1427 struct hidp_conninfo ci;
1428
1429 hidp_copy_session(session, &ci);
1430
1431 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
1432 err = -EFAULT;
1433 break;
1434 }
1435
1436 if (++n >= req->cnum)
1437 break;
1438
1439 req->ci++;
1440 }
1441 req->cnum = n;
1442
1443 up_read(&hidp_session_sem);
1444 return err;
1445}
1446
1447int hidp_get_conninfo(struct hidp_conninfo *ci)
1448{
1449 struct hidp_session *session;
1450
1451 session = hidp_session_find(&ci->bdaddr);
1452 if (session) {
1453 hidp_copy_session(session, ci);
1454 hidp_session_put(session);
1455 }
1456
1457 return session ? 0 : -ENOENT;
1458}
1459
1460static int __init hidp_init(void)
1461{
1462 BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);
1463
1464 return hidp_init_sockets();
1465}
1466
1467static void __exit hidp_exit(void)
1468{
1469 hidp_cleanup_sockets();
1470}
1471
1472module_init(hidp_init);
1473module_exit(hidp_exit);
1474
1475MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1476MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
1477MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
1478MODULE_VERSION(VERSION);
1479MODULE_LICENSE("GPL");
1480MODULE_ALIAS("bt-proto-6");
1/*
2 HIDP implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License version 2 as
7 published by the Free Software Foundation;
8
9 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
10 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
11 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
12 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
13 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
14 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17
18 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
19 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
20 SOFTWARE IS DISCLAIMED.
21*/
22
23#include <linux/module.h>
24
25#include <linux/types.h>
26#include <linux/errno.h>
27#include <linux/kernel.h>
28#include <linux/sched.h>
29#include <linux/slab.h>
30#include <linux/poll.h>
31#include <linux/freezer.h>
32#include <linux/fcntl.h>
33#include <linux/skbuff.h>
34#include <linux/socket.h>
35#include <linux/ioctl.h>
36#include <linux/file.h>
37#include <linux/init.h>
38#include <linux/wait.h>
39#include <linux/mutex.h>
40#include <linux/kthread.h>
41#include <net/sock.h>
42
43#include <linux/input.h>
44#include <linux/hid.h>
45#include <linux/hidraw.h>
46
47#include <net/bluetooth/bluetooth.h>
48#include <net/bluetooth/hci_core.h>
49#include <net/bluetooth/l2cap.h>
50
51#include "hidp.h"
52
53#define VERSION "1.2"
54
55static DECLARE_RWSEM(hidp_session_sem);
56static LIST_HEAD(hidp_session_list);
57
58static unsigned char hidp_keycode[256] = {
59 0, 0, 0, 0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36,
60 37, 38, 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45,
61 21, 44, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 28, 1,
62 14, 15, 57, 12, 13, 26, 27, 43, 43, 39, 40, 41, 51, 52,
63 53, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 87, 88,
64 99, 70, 119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103, 69,
65 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71, 72, 73,
66 82, 83, 86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189, 190,
67 191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135,
68 136, 113, 115, 114, 0, 0, 0, 121, 0, 89, 93, 124, 92, 94,
69 95, 0, 0, 0, 122, 123, 90, 91, 85, 0, 0, 0, 0, 0,
70 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
71 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
72 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
73 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
74 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
75 29, 42, 56, 125, 97, 54, 100, 126, 164, 166, 165, 163, 161, 115,
76 114, 113, 150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140
77};
78
79static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 };
80
81static struct hidp_session *__hidp_get_session(bdaddr_t *bdaddr)
82{
83 struct hidp_session *session;
84 struct list_head *p;
85
86 BT_DBG("");
87
88 list_for_each(p, &hidp_session_list) {
89 session = list_entry(p, struct hidp_session, list);
90 if (!bacmp(bdaddr, &session->bdaddr))
91 return session;
92 }
93 return NULL;
94}
95
96static void __hidp_link_session(struct hidp_session *session)
97{
98 __module_get(THIS_MODULE);
99 list_add(&session->list, &hidp_session_list);
100
101 hci_conn_hold_device(session->conn);
102}
103
104static void __hidp_unlink_session(struct hidp_session *session)
105{
106 hci_conn_put_device(session->conn);
107
108 list_del(&session->list);
109 module_put(THIS_MODULE);
110}
111
112static void __hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
113{
114 memset(ci, 0, sizeof(*ci));
115 bacpy(&ci->bdaddr, &session->bdaddr);
116
117 ci->flags = session->flags;
118 ci->state = session->state;
119
120 ci->vendor = 0x0000;
121 ci->product = 0x0000;
122 ci->version = 0x0000;
123
124 if (session->input) {
125 ci->vendor = session->input->id.vendor;
126 ci->product = session->input->id.product;
127 ci->version = session->input->id.version;
128 if (session->input->name)
129 strncpy(ci->name, session->input->name, 128);
130 else
131 strncpy(ci->name, "HID Boot Device", 128);
132 }
133
134 if (session->hid) {
135 ci->vendor = session->hid->vendor;
136 ci->product = session->hid->product;
137 ci->version = session->hid->version;
138 strncpy(ci->name, session->hid->name, 128);
139 }
140}
141
142static int hidp_queue_event(struct hidp_session *session, struct input_dev *dev,
143 unsigned int type, unsigned int code, int value)
144{
145 unsigned char newleds;
146 struct sk_buff *skb;
147
148 BT_DBG("session %p type %d code %d value %d", 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 skb = alloc_skb(3, GFP_ATOMIC);
165 if (!skb) {
166 BT_ERR("Can't allocate memory for new frame");
167 return -ENOMEM;
168 }
169
170 *skb_put(skb, 1) = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
171 *skb_put(skb, 1) = 0x01;
172 *skb_put(skb, 1) = newleds;
173
174 skb_queue_tail(&session->intr_transmit, skb);
175
176 hidp_schedule(session);
177
178 return 0;
179}
180
181static int hidp_hidinput_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
182{
183 struct hid_device *hid = input_get_drvdata(dev);
184 struct hidp_session *session = hid->driver_data;
185
186 return hidp_queue_event(session, dev, type, code, value);
187}
188
189static int hidp_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
190{
191 struct hidp_session *session = input_get_drvdata(dev);
192
193 return hidp_queue_event(session, dev, type, code, value);
194}
195
196static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb)
197{
198 struct input_dev *dev = session->input;
199 unsigned char *keys = session->keys;
200 unsigned char *udata = skb->data + 1;
201 signed char *sdata = skb->data + 1;
202 int i, size = skb->len - 1;
203
204 switch (skb->data[0]) {
205 case 0x01: /* Keyboard report */
206 for (i = 0; i < 8; i++)
207 input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1);
208
209 /* If all the key codes have been set to 0x01, it means
210 * too many keys were pressed at the same time. */
211 if (!memcmp(udata + 2, hidp_mkeyspat, 6))
212 break;
213
214 for (i = 2; i < 8; i++) {
215 if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) {
216 if (hidp_keycode[keys[i]])
217 input_report_key(dev, hidp_keycode[keys[i]], 0);
218 else
219 BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
220 }
221
222 if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) {
223 if (hidp_keycode[udata[i]])
224 input_report_key(dev, hidp_keycode[udata[i]], 1);
225 else
226 BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]);
227 }
228 }
229
230 memcpy(keys, udata, 8);
231 break;
232
233 case 0x02: /* Mouse report */
234 input_report_key(dev, BTN_LEFT, sdata[0] & 0x01);
235 input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02);
236 input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04);
237 input_report_key(dev, BTN_SIDE, sdata[0] & 0x08);
238 input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10);
239
240 input_report_rel(dev, REL_X, sdata[1]);
241 input_report_rel(dev, REL_Y, sdata[2]);
242
243 if (size > 3)
244 input_report_rel(dev, REL_WHEEL, sdata[3]);
245 break;
246 }
247
248 input_sync(dev);
249}
250
251static int __hidp_send_ctrl_message(struct hidp_session *session,
252 unsigned char hdr, unsigned char *data, int size)
253{
254 struct sk_buff *skb;
255
256 BT_DBG("session %p data %p size %d", session, data, size);
257
258 skb = alloc_skb(size + 1, GFP_ATOMIC);
259 if (!skb) {
260 BT_ERR("Can't allocate memory for new frame");
261 return -ENOMEM;
262 }
263
264 *skb_put(skb, 1) = hdr;
265 if (data && size > 0)
266 memcpy(skb_put(skb, size), data, size);
267
268 skb_queue_tail(&session->ctrl_transmit, skb);
269
270 return 0;
271}
272
273static inline int hidp_send_ctrl_message(struct hidp_session *session,
274 unsigned char hdr, unsigned char *data, int size)
275{
276 int err;
277
278 err = __hidp_send_ctrl_message(session, hdr, data, size);
279
280 hidp_schedule(session);
281
282 return err;
283}
284
285static int hidp_queue_report(struct hidp_session *session,
286 unsigned char *data, int size)
287{
288 struct sk_buff *skb;
289
290 BT_DBG("session %p hid %p data %p size %d", session, session->hid, data, size);
291
292 skb = alloc_skb(size + 1, GFP_ATOMIC);
293 if (!skb) {
294 BT_ERR("Can't allocate memory for new frame");
295 return -ENOMEM;
296 }
297
298 *skb_put(skb, 1) = 0xa2;
299 if (size > 0)
300 memcpy(skb_put(skb, size), data, size);
301
302 skb_queue_tail(&session->intr_transmit, skb);
303
304 hidp_schedule(session);
305
306 return 0;
307}
308
309static int hidp_send_report(struct hidp_session *session, struct hid_report *report)
310{
311 unsigned char buf[32];
312 int rsize;
313
314 rsize = ((report->size - 1) >> 3) + 1 + (report->id > 0);
315 if (rsize > sizeof(buf))
316 return -EIO;
317
318 hid_output_report(report, buf);
319
320 return hidp_queue_report(session, buf, rsize);
321}
322
323static int hidp_get_raw_report(struct hid_device *hid,
324 unsigned char report_number,
325 unsigned char *data, size_t count,
326 unsigned char report_type)
327{
328 struct hidp_session *session = hid->driver_data;
329 struct sk_buff *skb;
330 size_t len;
331 int numbered_reports = hid->report_enum[report_type].numbered;
332
333 switch (report_type) {
334 case HID_FEATURE_REPORT:
335 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE;
336 break;
337 case HID_INPUT_REPORT:
338 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT;
339 break;
340 case HID_OUTPUT_REPORT:
341 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT;
342 break;
343 default:
344 return -EINVAL;
345 }
346
347 if (mutex_lock_interruptible(&session->report_mutex))
348 return -ERESTARTSYS;
349
350 /* Set up our wait, and send the report request to the device. */
351 session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK;
352 session->waiting_report_number = numbered_reports ? report_number : -1;
353 set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
354 data[0] = report_number;
355 if (hidp_send_ctrl_message(hid->driver_data, report_type, data, 1))
356 goto err_eio;
357
358 /* Wait for the return of the report. The returned report
359 gets put in session->report_return. */
360 while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)) {
361 int res;
362
363 res = wait_event_interruptible_timeout(session->report_queue,
364 !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags),
365 5*HZ);
366 if (res == 0) {
367 /* timeout */
368 goto err_eio;
369 }
370 if (res < 0) {
371 /* signal */
372 goto err_restartsys;
373 }
374 }
375
376 skb = session->report_return;
377 if (skb) {
378 len = skb->len < count ? skb->len : count;
379 memcpy(data, skb->data, len);
380
381 kfree_skb(skb);
382 session->report_return = NULL;
383 } else {
384 /* Device returned a HANDSHAKE, indicating protocol error. */
385 len = -EIO;
386 }
387
388 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
389 mutex_unlock(&session->report_mutex);
390
391 return len;
392
393err_restartsys:
394 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
395 mutex_unlock(&session->report_mutex);
396 return -ERESTARTSYS;
397err_eio:
398 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
399 mutex_unlock(&session->report_mutex);
400 return -EIO;
401}
402
403static int hidp_output_raw_report(struct hid_device *hid, unsigned char *data, size_t count,
404 unsigned char report_type)
405{
406 struct hidp_session *session = hid->driver_data;
407 int ret;
408
409 switch (report_type) {
410 case HID_FEATURE_REPORT:
411 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE;
412 break;
413 case HID_OUTPUT_REPORT:
414 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT;
415 break;
416 default:
417 return -EINVAL;
418 }
419
420 if (mutex_lock_interruptible(&session->report_mutex))
421 return -ERESTARTSYS;
422
423 /* Set up our wait, and send the report request to the device. */
424 set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
425 if (hidp_send_ctrl_message(hid->driver_data, report_type,
426 data, count)) {
427 ret = -ENOMEM;
428 goto err;
429 }
430
431 /* Wait for the ACK from the device. */
432 while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) {
433 int res;
434
435 res = wait_event_interruptible_timeout(session->report_queue,
436 !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags),
437 10*HZ);
438 if (res == 0) {
439 /* timeout */
440 ret = -EIO;
441 goto err;
442 }
443 if (res < 0) {
444 /* signal */
445 ret = -ERESTARTSYS;
446 goto err;
447 }
448 }
449
450 if (!session->output_report_success) {
451 ret = -EIO;
452 goto err;
453 }
454
455 ret = count;
456
457err:
458 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
459 mutex_unlock(&session->report_mutex);
460 return ret;
461}
462
463static void hidp_idle_timeout(unsigned long arg)
464{
465 struct hidp_session *session = (struct hidp_session *) arg;
466
467 atomic_inc(&session->terminate);
468 wake_up_process(session->task);
469}
470
471static void hidp_set_timer(struct hidp_session *session)
472{
473 if (session->idle_to > 0)
474 mod_timer(&session->timer, jiffies + HZ * session->idle_to);
475}
476
477static inline void hidp_del_timer(struct hidp_session *session)
478{
479 if (session->idle_to > 0)
480 del_timer(&session->timer);
481}
482
483static void hidp_process_handshake(struct hidp_session *session,
484 unsigned char param)
485{
486 BT_DBG("session %p param 0x%02x", session, param);
487 session->output_report_success = 0; /* default condition */
488
489 switch (param) {
490 case HIDP_HSHK_SUCCESSFUL:
491 /* FIXME: Call into SET_ GET_ handlers here */
492 session->output_report_success = 1;
493 break;
494
495 case HIDP_HSHK_NOT_READY:
496 case HIDP_HSHK_ERR_INVALID_REPORT_ID:
497 case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST:
498 case HIDP_HSHK_ERR_INVALID_PARAMETER:
499 if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)) {
500 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
501 wake_up_interruptible(&session->report_queue);
502 }
503 /* FIXME: Call into SET_ GET_ handlers here */
504 break;
505
506 case HIDP_HSHK_ERR_UNKNOWN:
507 break;
508
509 case HIDP_HSHK_ERR_FATAL:
510 /* Device requests a reboot, as this is the only way this error
511 * can be recovered. */
512 __hidp_send_ctrl_message(session,
513 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0);
514 break;
515
516 default:
517 __hidp_send_ctrl_message(session,
518 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
519 break;
520 }
521
522 /* Wake up the waiting thread. */
523 if (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) {
524 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
525 wake_up_interruptible(&session->report_queue);
526 }
527}
528
529static void hidp_process_hid_control(struct hidp_session *session,
530 unsigned char param)
531{
532 BT_DBG("session %p param 0x%02x", session, param);
533
534 if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) {
535 /* Flush the transmit queues */
536 skb_queue_purge(&session->ctrl_transmit);
537 skb_queue_purge(&session->intr_transmit);
538
539 atomic_inc(&session->terminate);
540 wake_up_process(current);
541 }
542}
543
544/* Returns true if the passed-in skb should be freed by the caller. */
545static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb,
546 unsigned char param)
547{
548 int done_with_skb = 1;
549 BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param);
550
551 switch (param) {
552 case HIDP_DATA_RTYPE_INPUT:
553 hidp_set_timer(session);
554
555 if (session->input)
556 hidp_input_report(session, skb);
557
558 if (session->hid)
559 hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 0);
560 break;
561
562 case HIDP_DATA_RTYPE_OTHER:
563 case HIDP_DATA_RTYPE_OUPUT:
564 case HIDP_DATA_RTYPE_FEATURE:
565 break;
566
567 default:
568 __hidp_send_ctrl_message(session,
569 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
570 }
571
572 if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
573 param == session->waiting_report_type) {
574 if (session->waiting_report_number < 0 ||
575 session->waiting_report_number == skb->data[0]) {
576 /* hidp_get_raw_report() is waiting on this report. */
577 session->report_return = skb;
578 done_with_skb = 0;
579 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
580 wake_up_interruptible(&session->report_queue);
581 }
582 }
583
584 return done_with_skb;
585}
586
587static void hidp_recv_ctrl_frame(struct hidp_session *session,
588 struct sk_buff *skb)
589{
590 unsigned char hdr, type, param;
591 int free_skb = 1;
592
593 BT_DBG("session %p skb %p len %d", session, skb, skb->len);
594
595 hdr = skb->data[0];
596 skb_pull(skb, 1);
597
598 type = hdr & HIDP_HEADER_TRANS_MASK;
599 param = hdr & HIDP_HEADER_PARAM_MASK;
600
601 switch (type) {
602 case HIDP_TRANS_HANDSHAKE:
603 hidp_process_handshake(session, param);
604 break;
605
606 case HIDP_TRANS_HID_CONTROL:
607 hidp_process_hid_control(session, param);
608 break;
609
610 case HIDP_TRANS_DATA:
611 free_skb = hidp_process_data(session, skb, param);
612 break;
613
614 default:
615 __hidp_send_ctrl_message(session,
616 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0);
617 break;
618 }
619
620 if (free_skb)
621 kfree_skb(skb);
622}
623
624static void hidp_recv_intr_frame(struct hidp_session *session,
625 struct sk_buff *skb)
626{
627 unsigned char hdr;
628
629 BT_DBG("session %p skb %p len %d", session, skb, skb->len);
630
631 hdr = skb->data[0];
632 skb_pull(skb, 1);
633
634 if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) {
635 hidp_set_timer(session);
636
637 if (session->input)
638 hidp_input_report(session, skb);
639
640 if (session->hid) {
641 hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 1);
642 BT_DBG("report len %d", skb->len);
643 }
644 } else {
645 BT_DBG("Unsupported protocol header 0x%02x", hdr);
646 }
647
648 kfree_skb(skb);
649}
650
651static int hidp_send_frame(struct socket *sock, unsigned char *data, int len)
652{
653 struct kvec iv = { data, len };
654 struct msghdr msg;
655
656 BT_DBG("sock %p data %p len %d", sock, data, len);
657
658 if (!len)
659 return 0;
660
661 memset(&msg, 0, sizeof(msg));
662
663 return kernel_sendmsg(sock, &msg, &iv, 1, len);
664}
665
666static void hidp_process_transmit(struct hidp_session *session)
667{
668 struct sk_buff *skb;
669
670 BT_DBG("session %p", session);
671
672 while ((skb = skb_dequeue(&session->ctrl_transmit))) {
673 if (hidp_send_frame(session->ctrl_sock, skb->data, skb->len) < 0) {
674 skb_queue_head(&session->ctrl_transmit, skb);
675 break;
676 }
677
678 hidp_set_timer(session);
679 kfree_skb(skb);
680 }
681
682 while ((skb = skb_dequeue(&session->intr_transmit))) {
683 if (hidp_send_frame(session->intr_sock, skb->data, skb->len) < 0) {
684 skb_queue_head(&session->intr_transmit, skb);
685 break;
686 }
687
688 hidp_set_timer(session);
689 kfree_skb(skb);
690 }
691}
692
693static int hidp_session(void *arg)
694{
695 struct hidp_session *session = arg;
696 struct sock *ctrl_sk = session->ctrl_sock->sk;
697 struct sock *intr_sk = session->intr_sock->sk;
698 struct sk_buff *skb;
699 wait_queue_t ctrl_wait, intr_wait;
700
701 BT_DBG("session %p", session);
702
703 set_user_nice(current, -15);
704
705 init_waitqueue_entry(&ctrl_wait, current);
706 init_waitqueue_entry(&intr_wait, current);
707 add_wait_queue(sk_sleep(ctrl_sk), &ctrl_wait);
708 add_wait_queue(sk_sleep(intr_sk), &intr_wait);
709 session->waiting_for_startup = 0;
710 wake_up_interruptible(&session->startup_queue);
711 set_current_state(TASK_INTERRUPTIBLE);
712 while (!atomic_read(&session->terminate)) {
713 if (ctrl_sk->sk_state != BT_CONNECTED ||
714 intr_sk->sk_state != BT_CONNECTED)
715 break;
716
717 while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
718 skb_orphan(skb);
719 hidp_recv_ctrl_frame(session, skb);
720 }
721
722 while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
723 skb_orphan(skb);
724 hidp_recv_intr_frame(session, skb);
725 }
726
727 hidp_process_transmit(session);
728
729 schedule();
730 set_current_state(TASK_INTERRUPTIBLE);
731 }
732 set_current_state(TASK_RUNNING);
733 remove_wait_queue(sk_sleep(intr_sk), &intr_wait);
734 remove_wait_queue(sk_sleep(ctrl_sk), &ctrl_wait);
735
736 down_write(&hidp_session_sem);
737
738 hidp_del_timer(session);
739
740 if (session->input) {
741 input_unregister_device(session->input);
742 session->input = NULL;
743 }
744
745 if (session->hid) {
746 hid_destroy_device(session->hid);
747 session->hid = NULL;
748 }
749
750 /* Wakeup user-space polling for socket errors */
751 session->intr_sock->sk->sk_err = EUNATCH;
752 session->ctrl_sock->sk->sk_err = EUNATCH;
753
754 hidp_schedule(session);
755
756 fput(session->intr_sock->file);
757
758 wait_event_timeout(*(sk_sleep(ctrl_sk)),
759 (ctrl_sk->sk_state == BT_CLOSED), msecs_to_jiffies(500));
760
761 fput(session->ctrl_sock->file);
762
763 __hidp_unlink_session(session);
764
765 up_write(&hidp_session_sem);
766
767 kfree(session->rd_data);
768 kfree(session);
769 return 0;
770}
771
772static struct device *hidp_get_device(struct hidp_session *session)
773{
774 bdaddr_t *src = &bt_sk(session->ctrl_sock->sk)->src;
775 bdaddr_t *dst = &bt_sk(session->ctrl_sock->sk)->dst;
776 struct device *device = NULL;
777 struct hci_dev *hdev;
778
779 hdev = hci_get_route(dst, src);
780 if (!hdev)
781 return NULL;
782
783 session->conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
784 if (session->conn)
785 device = &session->conn->dev;
786
787 hci_dev_put(hdev);
788
789 return device;
790}
791
792static int hidp_setup_input(struct hidp_session *session,
793 struct hidp_connadd_req *req)
794{
795 struct input_dev *input;
796 int err, i;
797
798 input = input_allocate_device();
799 if (!input)
800 return -ENOMEM;
801
802 session->input = input;
803
804 input_set_drvdata(input, session);
805
806 input->name = "Bluetooth HID Boot Protocol Device";
807
808 input->id.bustype = BUS_BLUETOOTH;
809 input->id.vendor = req->vendor;
810 input->id.product = req->product;
811 input->id.version = req->version;
812
813 if (req->subclass & 0x40) {
814 set_bit(EV_KEY, input->evbit);
815 set_bit(EV_LED, input->evbit);
816 set_bit(EV_REP, input->evbit);
817
818 set_bit(LED_NUML, input->ledbit);
819 set_bit(LED_CAPSL, input->ledbit);
820 set_bit(LED_SCROLLL, input->ledbit);
821 set_bit(LED_COMPOSE, input->ledbit);
822 set_bit(LED_KANA, input->ledbit);
823
824 for (i = 0; i < sizeof(hidp_keycode); i++)
825 set_bit(hidp_keycode[i], input->keybit);
826 clear_bit(0, input->keybit);
827 }
828
829 if (req->subclass & 0x80) {
830 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
831 input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
832 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
833 input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
834 input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
835 BIT_MASK(BTN_EXTRA);
836 input->relbit[0] |= BIT_MASK(REL_WHEEL);
837 }
838
839 input->dev.parent = hidp_get_device(session);
840
841 input->event = hidp_input_event;
842
843 err = input_register_device(input);
844 if (err < 0) {
845 input_free_device(input);
846 session->input = NULL;
847 return err;
848 }
849
850 return 0;
851}
852
853static int hidp_open(struct hid_device *hid)
854{
855 return 0;
856}
857
858static void hidp_close(struct hid_device *hid)
859{
860}
861
862static int hidp_parse(struct hid_device *hid)
863{
864 struct hidp_session *session = hid->driver_data;
865
866 return hid_parse_report(session->hid, session->rd_data,
867 session->rd_size);
868}
869
870static int hidp_start(struct hid_device *hid)
871{
872 struct hidp_session *session = hid->driver_data;
873 struct hid_report *report;
874
875 list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].
876 report_list, list)
877 hidp_send_report(session, report);
878
879 list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].
880 report_list, list)
881 hidp_send_report(session, report);
882
883 return 0;
884}
885
886static void hidp_stop(struct hid_device *hid)
887{
888 struct hidp_session *session = hid->driver_data;
889
890 skb_queue_purge(&session->ctrl_transmit);
891 skb_queue_purge(&session->intr_transmit);
892
893 hid->claimed = 0;
894}
895
896static struct hid_ll_driver hidp_hid_driver = {
897 .parse = hidp_parse,
898 .start = hidp_start,
899 .stop = hidp_stop,
900 .open = hidp_open,
901 .close = hidp_close,
902 .hidinput_input_event = hidp_hidinput_event,
903};
904
905/* This function sets up the hid device. It does not add it
906 to the HID system. That is done in hidp_add_connection(). */
907static int hidp_setup_hid(struct hidp_session *session,
908 struct hidp_connadd_req *req)
909{
910 struct hid_device *hid;
911 int err;
912
913 session->rd_data = kzalloc(req->rd_size, GFP_KERNEL);
914 if (!session->rd_data)
915 return -ENOMEM;
916
917 if (copy_from_user(session->rd_data, req->rd_data, req->rd_size)) {
918 err = -EFAULT;
919 goto fault;
920 }
921 session->rd_size = req->rd_size;
922
923 hid = hid_allocate_device();
924 if (IS_ERR(hid)) {
925 err = PTR_ERR(hid);
926 goto fault;
927 }
928
929 session->hid = hid;
930
931 hid->driver_data = session;
932
933 hid->bus = BUS_BLUETOOTH;
934 hid->vendor = req->vendor;
935 hid->product = req->product;
936 hid->version = req->version;
937 hid->country = req->country;
938
939 strncpy(hid->name, req->name, 128);
940 strncpy(hid->phys, batostr(&bt_sk(session->ctrl_sock->sk)->src), 64);
941 strncpy(hid->uniq, batostr(&bt_sk(session->ctrl_sock->sk)->dst), 64);
942
943 hid->dev.parent = hidp_get_device(session);
944 hid->ll_driver = &hidp_hid_driver;
945
946 hid->hid_get_raw_report = hidp_get_raw_report;
947 hid->hid_output_raw_report = hidp_output_raw_report;
948
949 return 0;
950
951fault:
952 kfree(session->rd_data);
953 session->rd_data = NULL;
954
955 return err;
956}
957
958int hidp_add_connection(struct hidp_connadd_req *req, struct socket *ctrl_sock, struct socket *intr_sock)
959{
960 struct hidp_session *session, *s;
961 int vendor, product;
962 int err;
963
964 BT_DBG("");
965
966 if (bacmp(&bt_sk(ctrl_sock->sk)->src, &bt_sk(intr_sock->sk)->src) ||
967 bacmp(&bt_sk(ctrl_sock->sk)->dst, &bt_sk(intr_sock->sk)->dst))
968 return -ENOTUNIQ;
969
970 session = kzalloc(sizeof(struct hidp_session), GFP_KERNEL);
971 if (!session)
972 return -ENOMEM;
973
974 BT_DBG("rd_data %p rd_size %d", req->rd_data, req->rd_size);
975
976 down_write(&hidp_session_sem);
977
978 s = __hidp_get_session(&bt_sk(ctrl_sock->sk)->dst);
979 if (s && s->state == BT_CONNECTED) {
980 err = -EEXIST;
981 goto failed;
982 }
983
984 bacpy(&session->bdaddr, &bt_sk(ctrl_sock->sk)->dst);
985
986 session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl_sock->sk)->chan->omtu,
987 l2cap_pi(ctrl_sock->sk)->chan->imtu);
988 session->intr_mtu = min_t(uint, l2cap_pi(intr_sock->sk)->chan->omtu,
989 l2cap_pi(intr_sock->sk)->chan->imtu);
990
991 BT_DBG("ctrl mtu %d intr mtu %d", session->ctrl_mtu, session->intr_mtu);
992
993 session->ctrl_sock = ctrl_sock;
994 session->intr_sock = intr_sock;
995 session->state = BT_CONNECTED;
996
997 setup_timer(&session->timer, hidp_idle_timeout, (unsigned long)session);
998
999 skb_queue_head_init(&session->ctrl_transmit);
1000 skb_queue_head_init(&session->intr_transmit);
1001
1002 mutex_init(&session->report_mutex);
1003 init_waitqueue_head(&session->report_queue);
1004 init_waitqueue_head(&session->startup_queue);
1005 session->waiting_for_startup = 1;
1006 session->flags = req->flags & (1 << HIDP_BLUETOOTH_VENDOR_ID);
1007 session->idle_to = req->idle_to;
1008
1009 if (req->rd_size > 0) {
1010 err = hidp_setup_hid(session, req);
1011 if (err && err != -ENODEV)
1012 goto purge;
1013 }
1014
1015 if (!session->hid) {
1016 err = hidp_setup_input(session, req);
1017 if (err < 0)
1018 goto purge;
1019 }
1020
1021 __hidp_link_session(session);
1022
1023 hidp_set_timer(session);
1024
1025 if (session->hid) {
1026 vendor = session->hid->vendor;
1027 product = session->hid->product;
1028 } else if (session->input) {
1029 vendor = session->input->id.vendor;
1030 product = session->input->id.product;
1031 } else {
1032 vendor = 0x0000;
1033 product = 0x0000;
1034 }
1035
1036 session->task = kthread_run(hidp_session, session, "khidpd_%04x%04x",
1037 vendor, product);
1038 if (IS_ERR(session->task)) {
1039 err = PTR_ERR(session->task);
1040 goto unlink;
1041 }
1042
1043 while (session->waiting_for_startup) {
1044 wait_event_interruptible(session->startup_queue,
1045 !session->waiting_for_startup);
1046 }
1047
1048 err = hid_add_device(session->hid);
1049 if (err < 0) {
1050 atomic_inc(&session->terminate);
1051 wake_up_process(session->task);
1052 up_write(&hidp_session_sem);
1053 return err;
1054 }
1055
1056 if (session->input) {
1057 hidp_send_ctrl_message(session,
1058 HIDP_TRANS_SET_PROTOCOL | HIDP_PROTO_BOOT, NULL, 0);
1059 session->flags |= (1 << HIDP_BOOT_PROTOCOL_MODE);
1060
1061 session->leds = 0xff;
1062 hidp_input_event(session->input, EV_LED, 0, 0);
1063 }
1064
1065 up_write(&hidp_session_sem);
1066 return 0;
1067
1068unlink:
1069 hidp_del_timer(session);
1070
1071 __hidp_unlink_session(session);
1072
1073 if (session->input) {
1074 input_unregister_device(session->input);
1075 session->input = NULL;
1076 }
1077
1078 if (session->hid) {
1079 hid_destroy_device(session->hid);
1080 session->hid = NULL;
1081 }
1082
1083 kfree(session->rd_data);
1084 session->rd_data = NULL;
1085
1086purge:
1087 skb_queue_purge(&session->ctrl_transmit);
1088 skb_queue_purge(&session->intr_transmit);
1089
1090failed:
1091 up_write(&hidp_session_sem);
1092
1093 kfree(session);
1094 return err;
1095}
1096
1097int hidp_del_connection(struct hidp_conndel_req *req)
1098{
1099 struct hidp_session *session;
1100 int err = 0;
1101
1102 BT_DBG("");
1103
1104 down_read(&hidp_session_sem);
1105
1106 session = __hidp_get_session(&req->bdaddr);
1107 if (session) {
1108 if (req->flags & (1 << HIDP_VIRTUAL_CABLE_UNPLUG)) {
1109 hidp_send_ctrl_message(session,
1110 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG, NULL, 0);
1111 } else {
1112 /* Flush the transmit queues */
1113 skb_queue_purge(&session->ctrl_transmit);
1114 skb_queue_purge(&session->intr_transmit);
1115
1116 atomic_inc(&session->terminate);
1117 wake_up_process(session->task);
1118 }
1119 } else
1120 err = -ENOENT;
1121
1122 up_read(&hidp_session_sem);
1123 return err;
1124}
1125
1126int hidp_get_connlist(struct hidp_connlist_req *req)
1127{
1128 struct list_head *p;
1129 int err = 0, n = 0;
1130
1131 BT_DBG("");
1132
1133 down_read(&hidp_session_sem);
1134
1135 list_for_each(p, &hidp_session_list) {
1136 struct hidp_session *session;
1137 struct hidp_conninfo ci;
1138
1139 session = list_entry(p, struct hidp_session, list);
1140
1141 __hidp_copy_session(session, &ci);
1142
1143 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
1144 err = -EFAULT;
1145 break;
1146 }
1147
1148 if (++n >= req->cnum)
1149 break;
1150
1151 req->ci++;
1152 }
1153 req->cnum = n;
1154
1155 up_read(&hidp_session_sem);
1156 return err;
1157}
1158
1159int hidp_get_conninfo(struct hidp_conninfo *ci)
1160{
1161 struct hidp_session *session;
1162 int err = 0;
1163
1164 down_read(&hidp_session_sem);
1165
1166 session = __hidp_get_session(&ci->bdaddr);
1167 if (session)
1168 __hidp_copy_session(session, ci);
1169 else
1170 err = -ENOENT;
1171
1172 up_read(&hidp_session_sem);
1173 return err;
1174}
1175
1176static const struct hid_device_id hidp_table[] = {
1177 { HID_BLUETOOTH_DEVICE(HID_ANY_ID, HID_ANY_ID) },
1178 { }
1179};
1180
1181static struct hid_driver hidp_driver = {
1182 .name = "generic-bluetooth",
1183 .id_table = hidp_table,
1184};
1185
1186static int __init hidp_init(void)
1187{
1188 int ret;
1189
1190 BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);
1191
1192 ret = hid_register_driver(&hidp_driver);
1193 if (ret)
1194 goto err;
1195
1196 ret = hidp_init_sockets();
1197 if (ret)
1198 goto err_drv;
1199
1200 return 0;
1201err_drv:
1202 hid_unregister_driver(&hidp_driver);
1203err:
1204 return ret;
1205}
1206
1207static void __exit hidp_exit(void)
1208{
1209 hidp_cleanup_sockets();
1210 hid_unregister_driver(&hidp_driver);
1211}
1212
1213module_init(hidp_init);
1214module_exit(hidp_exit);
1215
1216MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1217MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
1218MODULE_VERSION(VERSION);
1219MODULE_LICENSE("GPL");
1220MODULE_ALIAS("bt-proto-6");