Loading...
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
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
85 BT_DBG("");
86
87 list_for_each_entry(session, &hidp_session_list, list) {
88 if (!bacmp(bdaddr, &session->bdaddr))
89 return session;
90 }
91
92 return NULL;
93}
94
95static void __hidp_link_session(struct hidp_session *session)
96{
97 list_add(&session->list, &hidp_session_list);
98}
99
100static void __hidp_unlink_session(struct hidp_session *session)
101{
102 hci_conn_put_device(session->conn);
103
104 list_del(&session->list);
105}
106
107static void __hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
108{
109 memset(ci, 0, sizeof(*ci));
110 bacpy(&ci->bdaddr, &session->bdaddr);
111
112 ci->flags = session->flags;
113 ci->state = session->state;
114
115 ci->vendor = 0x0000;
116 ci->product = 0x0000;
117 ci->version = 0x0000;
118
119 if (session->input) {
120 ci->vendor = session->input->id.vendor;
121 ci->product = session->input->id.product;
122 ci->version = session->input->id.version;
123 if (session->input->name)
124 strncpy(ci->name, session->input->name, 128);
125 else
126 strncpy(ci->name, "HID Boot Device", 128);
127 }
128
129 if (session->hid) {
130 ci->vendor = session->hid->vendor;
131 ci->product = session->hid->product;
132 ci->version = session->hid->version;
133 strncpy(ci->name, session->hid->name, 128);
134 }
135}
136
137static int hidp_queue_event(struct hidp_session *session, struct input_dev *dev,
138 unsigned int type, unsigned int code, int value)
139{
140 unsigned char newleds;
141 struct sk_buff *skb;
142
143 BT_DBG("session %p type %d code %d value %d", session, type, code, value);
144
145 if (type != EV_LED)
146 return -1;
147
148 newleds = (!!test_bit(LED_KANA, dev->led) << 3) |
149 (!!test_bit(LED_COMPOSE, dev->led) << 3) |
150 (!!test_bit(LED_SCROLLL, dev->led) << 2) |
151 (!!test_bit(LED_CAPSL, dev->led) << 1) |
152 (!!test_bit(LED_NUML, dev->led));
153
154 if (session->leds == newleds)
155 return 0;
156
157 session->leds = newleds;
158
159 skb = alloc_skb(3, GFP_ATOMIC);
160 if (!skb) {
161 BT_ERR("Can't allocate memory for new frame");
162 return -ENOMEM;
163 }
164
165 *skb_put(skb, 1) = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
166 *skb_put(skb, 1) = 0x01;
167 *skb_put(skb, 1) = newleds;
168
169 skb_queue_tail(&session->intr_transmit, skb);
170
171 hidp_schedule(session);
172
173 return 0;
174}
175
176static int hidp_hidinput_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
177{
178 struct hid_device *hid = input_get_drvdata(dev);
179 struct hidp_session *session = hid->driver_data;
180
181 return hidp_queue_event(session, dev, type, code, value);
182}
183
184static int hidp_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
185{
186 struct hidp_session *session = input_get_drvdata(dev);
187
188 return hidp_queue_event(session, dev, type, code, value);
189}
190
191static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb)
192{
193 struct input_dev *dev = session->input;
194 unsigned char *keys = session->keys;
195 unsigned char *udata = skb->data + 1;
196 signed char *sdata = skb->data + 1;
197 int i, size = skb->len - 1;
198
199 switch (skb->data[0]) {
200 case 0x01: /* Keyboard report */
201 for (i = 0; i < 8; i++)
202 input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1);
203
204 /* If all the key codes have been set to 0x01, it means
205 * too many keys were pressed at the same time. */
206 if (!memcmp(udata + 2, hidp_mkeyspat, 6))
207 break;
208
209 for (i = 2; i < 8; i++) {
210 if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) {
211 if (hidp_keycode[keys[i]])
212 input_report_key(dev, hidp_keycode[keys[i]], 0);
213 else
214 BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
215 }
216
217 if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) {
218 if (hidp_keycode[udata[i]])
219 input_report_key(dev, hidp_keycode[udata[i]], 1);
220 else
221 BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]);
222 }
223 }
224
225 memcpy(keys, udata, 8);
226 break;
227
228 case 0x02: /* Mouse report */
229 input_report_key(dev, BTN_LEFT, sdata[0] & 0x01);
230 input_report_key(dev, BTN_RIGHT, sdata[0] & 0x02);
231 input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04);
232 input_report_key(dev, BTN_SIDE, sdata[0] & 0x08);
233 input_report_key(dev, BTN_EXTRA, sdata[0] & 0x10);
234
235 input_report_rel(dev, REL_X, sdata[1]);
236 input_report_rel(dev, REL_Y, sdata[2]);
237
238 if (size > 3)
239 input_report_rel(dev, REL_WHEEL, sdata[3]);
240 break;
241 }
242
243 input_sync(dev);
244}
245
246static int __hidp_send_ctrl_message(struct hidp_session *session,
247 unsigned char hdr, unsigned char *data, int size)
248{
249 struct sk_buff *skb;
250
251 BT_DBG("session %p data %p size %d", session, data, size);
252
253 if (atomic_read(&session->terminate))
254 return -EIO;
255
256 skb = alloc_skb(size + 1, GFP_ATOMIC);
257 if (!skb) {
258 BT_ERR("Can't allocate memory for new frame");
259 return -ENOMEM;
260 }
261
262 *skb_put(skb, 1) = hdr;
263 if (data && size > 0)
264 memcpy(skb_put(skb, size), data, size);
265
266 skb_queue_tail(&session->ctrl_transmit, skb);
267
268 return 0;
269}
270
271static inline int hidp_send_ctrl_message(struct hidp_session *session,
272 unsigned char hdr, unsigned char *data, int size)
273{
274 int err;
275
276 err = __hidp_send_ctrl_message(session, hdr, data, size);
277
278 hidp_schedule(session);
279
280 return err;
281}
282
283static int hidp_queue_report(struct hidp_session *session,
284 unsigned char *data, int size)
285{
286 struct sk_buff *skb;
287
288 BT_DBG("session %p hid %p data %p size %d", session, session->hid, data, size);
289
290 skb = alloc_skb(size + 1, GFP_ATOMIC);
291 if (!skb) {
292 BT_ERR("Can't allocate memory for new frame");
293 return -ENOMEM;
294 }
295
296 *skb_put(skb, 1) = 0xa2;
297 if (size > 0)
298 memcpy(skb_put(skb, size), data, size);
299
300 skb_queue_tail(&session->intr_transmit, skb);
301
302 hidp_schedule(session);
303
304 return 0;
305}
306
307static int hidp_send_report(struct hidp_session *session, struct hid_report *report)
308{
309 unsigned char buf[32];
310 int rsize;
311
312 rsize = ((report->size - 1) >> 3) + 1 + (report->id > 0);
313 if (rsize > sizeof(buf))
314 return -EIO;
315
316 hid_output_report(report, buf);
317
318 return hidp_queue_report(session, buf, rsize);
319}
320
321static int hidp_get_raw_report(struct hid_device *hid,
322 unsigned char report_number,
323 unsigned char *data, size_t count,
324 unsigned char report_type)
325{
326 struct hidp_session *session = hid->driver_data;
327 struct sk_buff *skb;
328 size_t len;
329 int numbered_reports = hid->report_enum[report_type].numbered;
330 int ret;
331
332 switch (report_type) {
333 case HID_FEATURE_REPORT:
334 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE;
335 break;
336 case HID_INPUT_REPORT:
337 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT;
338 break;
339 case HID_OUTPUT_REPORT:
340 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT;
341 break;
342 default:
343 return -EINVAL;
344 }
345
346 if (mutex_lock_interruptible(&session->report_mutex))
347 return -ERESTARTSYS;
348
349 /* Set up our wait, and send the report request to the device. */
350 session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK;
351 session->waiting_report_number = numbered_reports ? report_number : -1;
352 set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
353 data[0] = report_number;
354 ret = hidp_send_ctrl_message(hid->driver_data, report_type, data, 1);
355 if (ret)
356 goto err;
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 ret = -EIO;
369 goto err;
370 }
371 if (res < 0) {
372 /* signal */
373 ret = -ERESTARTSYS;
374 goto err;
375 }
376 }
377
378 skb = session->report_return;
379 if (skb) {
380 len = skb->len < count ? skb->len : count;
381 memcpy(data, skb->data, len);
382
383 kfree_skb(skb);
384 session->report_return = NULL;
385 } else {
386 /* Device returned a HANDSHAKE, indicating protocol error. */
387 len = -EIO;
388 }
389
390 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
391 mutex_unlock(&session->report_mutex);
392
393 return len;
394
395err:
396 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
397 mutex_unlock(&session->report_mutex);
398 return ret;
399}
400
401static int hidp_output_raw_report(struct hid_device *hid, unsigned char *data, size_t count,
402 unsigned char report_type)
403{
404 struct hidp_session *session = hid->driver_data;
405 int ret;
406
407 switch (report_type) {
408 case HID_FEATURE_REPORT:
409 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE;
410 break;
411 case HID_OUTPUT_REPORT:
412 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT;
413 break;
414 default:
415 return -EINVAL;
416 }
417
418 if (mutex_lock_interruptible(&session->report_mutex))
419 return -ERESTARTSYS;
420
421 /* Set up our wait, and send the report request to the device. */
422 set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
423 ret = hidp_send_ctrl_message(hid->driver_data, report_type, data,
424 count);
425 if (ret)
426 goto err;
427
428 /* Wait for the ACK from the device. */
429 while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)) {
430 int res;
431
432 res = wait_event_interruptible_timeout(session->report_queue,
433 !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags),
434 10*HZ);
435 if (res == 0) {
436 /* timeout */
437 ret = -EIO;
438 goto err;
439 }
440 if (res < 0) {
441 /* signal */
442 ret = -ERESTARTSYS;
443 goto err;
444 }
445 }
446
447 if (!session->output_report_success) {
448 ret = -EIO;
449 goto err;
450 }
451
452 ret = count;
453
454err:
455 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
456 mutex_unlock(&session->report_mutex);
457 return ret;
458}
459
460static void hidp_idle_timeout(unsigned long arg)
461{
462 struct hidp_session *session = (struct hidp_session *) arg;
463
464 atomic_inc(&session->terminate);
465 wake_up_process(session->task);
466}
467
468static void hidp_set_timer(struct hidp_session *session)
469{
470 if (session->idle_to > 0)
471 mod_timer(&session->timer, jiffies + HZ * session->idle_to);
472}
473
474static inline void hidp_del_timer(struct hidp_session *session)
475{
476 if (session->idle_to > 0)
477 del_timer(&session->timer);
478}
479
480static void hidp_process_handshake(struct hidp_session *session,
481 unsigned char param)
482{
483 BT_DBG("session %p param 0x%02x", session, param);
484 session->output_report_success = 0; /* default condition */
485
486 switch (param) {
487 case HIDP_HSHK_SUCCESSFUL:
488 /* FIXME: Call into SET_ GET_ handlers here */
489 session->output_report_success = 1;
490 break;
491
492 case HIDP_HSHK_NOT_READY:
493 case HIDP_HSHK_ERR_INVALID_REPORT_ID:
494 case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST:
495 case HIDP_HSHK_ERR_INVALID_PARAMETER:
496 if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags))
497 wake_up_interruptible(&session->report_queue);
498
499 /* FIXME: Call into SET_ GET_ handlers here */
500 break;
501
502 case HIDP_HSHK_ERR_UNKNOWN:
503 break;
504
505 case HIDP_HSHK_ERR_FATAL:
506 /* Device requests a reboot, as this is the only way this error
507 * can be recovered. */
508 __hidp_send_ctrl_message(session,
509 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0);
510 break;
511
512 default:
513 __hidp_send_ctrl_message(session,
514 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
515 break;
516 }
517
518 /* Wake up the waiting thread. */
519 if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags))
520 wake_up_interruptible(&session->report_queue);
521}
522
523static void hidp_process_hid_control(struct hidp_session *session,
524 unsigned char param)
525{
526 BT_DBG("session %p param 0x%02x", session, param);
527
528 if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) {
529 /* Flush the transmit queues */
530 skb_queue_purge(&session->ctrl_transmit);
531 skb_queue_purge(&session->intr_transmit);
532
533 atomic_inc(&session->terminate);
534 wake_up_process(current);
535 }
536}
537
538/* Returns true if the passed-in skb should be freed by the caller. */
539static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb,
540 unsigned char param)
541{
542 int done_with_skb = 1;
543 BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param);
544
545 switch (param) {
546 case HIDP_DATA_RTYPE_INPUT:
547 hidp_set_timer(session);
548
549 if (session->input)
550 hidp_input_report(session, skb);
551
552 if (session->hid)
553 hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 0);
554 break;
555
556 case HIDP_DATA_RTYPE_OTHER:
557 case HIDP_DATA_RTYPE_OUPUT:
558 case HIDP_DATA_RTYPE_FEATURE:
559 break;
560
561 default:
562 __hidp_send_ctrl_message(session,
563 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
564 }
565
566 if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
567 param == session->waiting_report_type) {
568 if (session->waiting_report_number < 0 ||
569 session->waiting_report_number == skb->data[0]) {
570 /* hidp_get_raw_report() is waiting on this report. */
571 session->report_return = skb;
572 done_with_skb = 0;
573 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
574 wake_up_interruptible(&session->report_queue);
575 }
576 }
577
578 return done_with_skb;
579}
580
581static void hidp_recv_ctrl_frame(struct hidp_session *session,
582 struct sk_buff *skb)
583{
584 unsigned char hdr, type, param;
585 int free_skb = 1;
586
587 BT_DBG("session %p skb %p len %d", session, skb, skb->len);
588
589 hdr = skb->data[0];
590 skb_pull(skb, 1);
591
592 type = hdr & HIDP_HEADER_TRANS_MASK;
593 param = hdr & HIDP_HEADER_PARAM_MASK;
594
595 switch (type) {
596 case HIDP_TRANS_HANDSHAKE:
597 hidp_process_handshake(session, param);
598 break;
599
600 case HIDP_TRANS_HID_CONTROL:
601 hidp_process_hid_control(session, param);
602 break;
603
604 case HIDP_TRANS_DATA:
605 free_skb = hidp_process_data(session, skb, param);
606 break;
607
608 default:
609 __hidp_send_ctrl_message(session,
610 HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0);
611 break;
612 }
613
614 if (free_skb)
615 kfree_skb(skb);
616}
617
618static void hidp_recv_intr_frame(struct hidp_session *session,
619 struct sk_buff *skb)
620{
621 unsigned char hdr;
622
623 BT_DBG("session %p skb %p len %d", session, skb, skb->len);
624
625 hdr = skb->data[0];
626 skb_pull(skb, 1);
627
628 if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) {
629 hidp_set_timer(session);
630
631 if (session->input)
632 hidp_input_report(session, skb);
633
634 if (session->hid) {
635 hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 1);
636 BT_DBG("report len %d", skb->len);
637 }
638 } else {
639 BT_DBG("Unsupported protocol header 0x%02x", hdr);
640 }
641
642 kfree_skb(skb);
643}
644
645static int hidp_send_frame(struct socket *sock, unsigned char *data, int len)
646{
647 struct kvec iv = { data, len };
648 struct msghdr msg;
649
650 BT_DBG("sock %p data %p len %d", sock, data, len);
651
652 if (!len)
653 return 0;
654
655 memset(&msg, 0, sizeof(msg));
656
657 return kernel_sendmsg(sock, &msg, &iv, 1, len);
658}
659
660static void hidp_process_intr_transmit(struct hidp_session *session)
661{
662 struct sk_buff *skb;
663
664 BT_DBG("session %p", session);
665
666 while ((skb = skb_dequeue(&session->intr_transmit))) {
667 if (hidp_send_frame(session->intr_sock, skb->data, skb->len) < 0) {
668 skb_queue_head(&session->intr_transmit, skb);
669 break;
670 }
671
672 hidp_set_timer(session);
673 kfree_skb(skb);
674 }
675}
676
677static void hidp_process_ctrl_transmit(struct hidp_session *session)
678{
679 struct sk_buff *skb;
680
681 BT_DBG("session %p", session);
682
683 while ((skb = skb_dequeue(&session->ctrl_transmit))) {
684 if (hidp_send_frame(session->ctrl_sock, skb->data, skb->len) < 0) {
685 skb_queue_head(&session->ctrl_transmit, skb);
686 break;
687 }
688
689 hidp_set_timer(session);
690 kfree_skb(skb);
691 }
692}
693
694static int hidp_session(void *arg)
695{
696 struct hidp_session *session = arg;
697 struct sock *ctrl_sk = session->ctrl_sock->sk;
698 struct sock *intr_sk = session->intr_sock->sk;
699 struct sk_buff *skb;
700 wait_queue_t ctrl_wait, intr_wait;
701
702 BT_DBG("session %p", session);
703
704 __module_get(THIS_MODULE);
705 set_user_nice(current, -15);
706
707 init_waitqueue_entry(&ctrl_wait, current);
708 init_waitqueue_entry(&intr_wait, current);
709 add_wait_queue(sk_sleep(ctrl_sk), &ctrl_wait);
710 add_wait_queue(sk_sleep(intr_sk), &intr_wait);
711 session->waiting_for_startup = 0;
712 wake_up_interruptible(&session->startup_queue);
713 set_current_state(TASK_INTERRUPTIBLE);
714 while (!atomic_read(&session->terminate)) {
715 if (ctrl_sk->sk_state != BT_CONNECTED ||
716 intr_sk->sk_state != BT_CONNECTED)
717 break;
718
719 while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
720 skb_orphan(skb);
721 if (!skb_linearize(skb))
722 hidp_recv_intr_frame(session, skb);
723 else
724 kfree_skb(skb);
725 }
726
727 hidp_process_intr_transmit(session);
728
729 while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
730 skb_orphan(skb);
731 if (!skb_linearize(skb))
732 hidp_recv_ctrl_frame(session, skb);
733 else
734 kfree_skb(skb);
735 }
736
737 hidp_process_ctrl_transmit(session);
738
739 schedule();
740 set_current_state(TASK_INTERRUPTIBLE);
741 }
742 set_current_state(TASK_RUNNING);
743 remove_wait_queue(sk_sleep(intr_sk), &intr_wait);
744 remove_wait_queue(sk_sleep(ctrl_sk), &ctrl_wait);
745
746 clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
747 clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
748 wake_up_interruptible(&session->report_queue);
749
750 down_write(&hidp_session_sem);
751
752 hidp_del_timer(session);
753
754 if (session->input) {
755 input_unregister_device(session->input);
756 session->input = NULL;
757 }
758
759 if (session->hid) {
760 hid_destroy_device(session->hid);
761 session->hid = NULL;
762 }
763
764 /* Wakeup user-space polling for socket errors */
765 session->intr_sock->sk->sk_err = EUNATCH;
766 session->ctrl_sock->sk->sk_err = EUNATCH;
767
768 hidp_schedule(session);
769
770 fput(session->intr_sock->file);
771
772 wait_event_timeout(*(sk_sleep(ctrl_sk)),
773 (ctrl_sk->sk_state == BT_CLOSED), msecs_to_jiffies(500));
774
775 fput(session->ctrl_sock->file);
776
777 __hidp_unlink_session(session);
778
779 up_write(&hidp_session_sem);
780
781 kfree(session->rd_data);
782 kfree(session);
783 module_put_and_exit(0);
784 return 0;
785}
786
787static struct hci_conn *hidp_get_connection(struct hidp_session *session)
788{
789 bdaddr_t *src = &bt_sk(session->ctrl_sock->sk)->src;
790 bdaddr_t *dst = &bt_sk(session->ctrl_sock->sk)->dst;
791 struct hci_conn *conn;
792 struct hci_dev *hdev;
793
794 hdev = hci_get_route(dst, src);
795 if (!hdev)
796 return NULL;
797
798 hci_dev_lock(hdev);
799 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
800 if (conn)
801 hci_conn_hold_device(conn);
802 hci_dev_unlock(hdev);
803
804 hci_dev_put(hdev);
805
806 return conn;
807}
808
809static int hidp_setup_input(struct hidp_session *session,
810 struct hidp_connadd_req *req)
811{
812 struct input_dev *input;
813 int i;
814
815 input = input_allocate_device();
816 if (!input)
817 return -ENOMEM;
818
819 session->input = input;
820
821 input_set_drvdata(input, session);
822
823 input->name = "Bluetooth HID Boot Protocol Device";
824
825 input->id.bustype = BUS_BLUETOOTH;
826 input->id.vendor = req->vendor;
827 input->id.product = req->product;
828 input->id.version = req->version;
829
830 if (req->subclass & 0x40) {
831 set_bit(EV_KEY, input->evbit);
832 set_bit(EV_LED, input->evbit);
833 set_bit(EV_REP, input->evbit);
834
835 set_bit(LED_NUML, input->ledbit);
836 set_bit(LED_CAPSL, input->ledbit);
837 set_bit(LED_SCROLLL, input->ledbit);
838 set_bit(LED_COMPOSE, input->ledbit);
839 set_bit(LED_KANA, input->ledbit);
840
841 for (i = 0; i < sizeof(hidp_keycode); i++)
842 set_bit(hidp_keycode[i], input->keybit);
843 clear_bit(0, input->keybit);
844 }
845
846 if (req->subclass & 0x80) {
847 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
848 input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
849 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
850 input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
851 input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
852 BIT_MASK(BTN_EXTRA);
853 input->relbit[0] |= BIT_MASK(REL_WHEEL);
854 }
855
856 input->dev.parent = &session->conn->dev;
857
858 input->event = hidp_input_event;
859
860 return 0;
861}
862
863static int hidp_open(struct hid_device *hid)
864{
865 return 0;
866}
867
868static void hidp_close(struct hid_device *hid)
869{
870}
871
872static int hidp_parse(struct hid_device *hid)
873{
874 struct hidp_session *session = hid->driver_data;
875
876 return hid_parse_report(session->hid, session->rd_data,
877 session->rd_size);
878}
879
880static int hidp_start(struct hid_device *hid)
881{
882 struct hidp_session *session = hid->driver_data;
883 struct hid_report *report;
884
885 if (hid->quirks & HID_QUIRK_NO_INIT_REPORTS)
886 return 0;
887
888 list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].
889 report_list, list)
890 hidp_send_report(session, report);
891
892 list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].
893 report_list, list)
894 hidp_send_report(session, report);
895
896 return 0;
897}
898
899static void hidp_stop(struct hid_device *hid)
900{
901 struct hidp_session *session = hid->driver_data;
902
903 skb_queue_purge(&session->ctrl_transmit);
904 skb_queue_purge(&session->intr_transmit);
905
906 hid->claimed = 0;
907}
908
909static struct hid_ll_driver hidp_hid_driver = {
910 .parse = hidp_parse,
911 .start = hidp_start,
912 .stop = hidp_stop,
913 .open = hidp_open,
914 .close = hidp_close,
915 .hidinput_input_event = hidp_hidinput_event,
916};
917
918/* This function sets up the hid device. It does not add it
919 to the HID system. That is done in hidp_add_connection(). */
920static int hidp_setup_hid(struct hidp_session *session,
921 struct hidp_connadd_req *req)
922{
923 struct hid_device *hid;
924 int err;
925
926 session->rd_data = kzalloc(req->rd_size, GFP_KERNEL);
927 if (!session->rd_data)
928 return -ENOMEM;
929
930 if (copy_from_user(session->rd_data, req->rd_data, req->rd_size)) {
931 err = -EFAULT;
932 goto fault;
933 }
934 session->rd_size = req->rd_size;
935
936 hid = hid_allocate_device();
937 if (IS_ERR(hid)) {
938 err = PTR_ERR(hid);
939 goto fault;
940 }
941
942 session->hid = hid;
943
944 hid->driver_data = session;
945
946 hid->bus = BUS_BLUETOOTH;
947 hid->vendor = req->vendor;
948 hid->product = req->product;
949 hid->version = req->version;
950 hid->country = req->country;
951
952 strncpy(hid->name, req->name, 128);
953 strncpy(hid->phys, batostr(&bt_sk(session->ctrl_sock->sk)->src), 64);
954 strncpy(hid->uniq, batostr(&bt_sk(session->ctrl_sock->sk)->dst), 64);
955
956 hid->dev.parent = &session->conn->dev;
957 hid->ll_driver = &hidp_hid_driver;
958
959 hid->hid_get_raw_report = hidp_get_raw_report;
960 hid->hid_output_raw_report = hidp_output_raw_report;
961
962 return 0;
963
964fault:
965 kfree(session->rd_data);
966 session->rd_data = NULL;
967
968 return err;
969}
970
971int hidp_add_connection(struct hidp_connadd_req *req, struct socket *ctrl_sock, struct socket *intr_sock)
972{
973 struct hidp_session *session, *s;
974 int vendor, product;
975 int err;
976
977 BT_DBG("");
978
979 if (bacmp(&bt_sk(ctrl_sock->sk)->src, &bt_sk(intr_sock->sk)->src) ||
980 bacmp(&bt_sk(ctrl_sock->sk)->dst, &bt_sk(intr_sock->sk)->dst))
981 return -ENOTUNIQ;
982
983 BT_DBG("rd_data %p rd_size %d", req->rd_data, req->rd_size);
984
985 down_write(&hidp_session_sem);
986
987 s = __hidp_get_session(&bt_sk(ctrl_sock->sk)->dst);
988 if (s && s->state == BT_CONNECTED) {
989 up_write(&hidp_session_sem);
990 return -EEXIST;
991 }
992
993 session = kzalloc(sizeof(struct hidp_session), GFP_KERNEL);
994 if (!session) {
995 up_write(&hidp_session_sem);
996 return -ENOMEM;
997 }
998
999 bacpy(&session->bdaddr, &bt_sk(ctrl_sock->sk)->dst);
1000
1001 session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl_sock->sk)->chan->omtu,
1002 l2cap_pi(ctrl_sock->sk)->chan->imtu);
1003 session->intr_mtu = min_t(uint, l2cap_pi(intr_sock->sk)->chan->omtu,
1004 l2cap_pi(intr_sock->sk)->chan->imtu);
1005
1006 BT_DBG("ctrl mtu %d intr mtu %d", session->ctrl_mtu, session->intr_mtu);
1007
1008 session->ctrl_sock = ctrl_sock;
1009 session->intr_sock = intr_sock;
1010 session->state = BT_CONNECTED;
1011
1012 session->conn = hidp_get_connection(session);
1013 if (!session->conn) {
1014 err = -ENOTCONN;
1015 goto failed;
1016 }
1017
1018 setup_timer(&session->timer, hidp_idle_timeout, (unsigned long)session);
1019
1020 skb_queue_head_init(&session->ctrl_transmit);
1021 skb_queue_head_init(&session->intr_transmit);
1022
1023 mutex_init(&session->report_mutex);
1024 init_waitqueue_head(&session->report_queue);
1025 init_waitqueue_head(&session->startup_queue);
1026 session->waiting_for_startup = 1;
1027 session->flags = req->flags & (1 << HIDP_BLUETOOTH_VENDOR_ID);
1028 session->idle_to = req->idle_to;
1029
1030 __hidp_link_session(session);
1031
1032 if (req->rd_size > 0) {
1033 err = hidp_setup_hid(session, req);
1034 if (err)
1035 goto purge;
1036 }
1037
1038 if (!session->hid) {
1039 err = hidp_setup_input(session, req);
1040 if (err < 0)
1041 goto purge;
1042 }
1043
1044 hidp_set_timer(session);
1045
1046 if (session->hid) {
1047 vendor = session->hid->vendor;
1048 product = session->hid->product;
1049 } else if (session->input) {
1050 vendor = session->input->id.vendor;
1051 product = session->input->id.product;
1052 } else {
1053 vendor = 0x0000;
1054 product = 0x0000;
1055 }
1056
1057 session->task = kthread_run(hidp_session, session, "khidpd_%04x%04x",
1058 vendor, product);
1059 if (IS_ERR(session->task)) {
1060 err = PTR_ERR(session->task);
1061 goto unlink;
1062 }
1063
1064 while (session->waiting_for_startup) {
1065 wait_event_interruptible(session->startup_queue,
1066 !session->waiting_for_startup);
1067 }
1068
1069 if (session->hid)
1070 err = hid_add_device(session->hid);
1071 else
1072 err = input_register_device(session->input);
1073
1074 if (err < 0) {
1075 atomic_inc(&session->terminate);
1076 wake_up_process(session->task);
1077 up_write(&hidp_session_sem);
1078 return err;
1079 }
1080
1081 if (session->input) {
1082 hidp_send_ctrl_message(session,
1083 HIDP_TRANS_SET_PROTOCOL | HIDP_PROTO_BOOT, NULL, 0);
1084 session->flags |= (1 << HIDP_BOOT_PROTOCOL_MODE);
1085
1086 session->leds = 0xff;
1087 hidp_input_event(session->input, EV_LED, 0, 0);
1088 }
1089
1090 up_write(&hidp_session_sem);
1091 return 0;
1092
1093unlink:
1094 hidp_del_timer(session);
1095
1096 if (session->input) {
1097 input_unregister_device(session->input);
1098 session->input = NULL;
1099 }
1100
1101 if (session->hid) {
1102 hid_destroy_device(session->hid);
1103 session->hid = NULL;
1104 }
1105
1106 kfree(session->rd_data);
1107 session->rd_data = NULL;
1108
1109purge:
1110 __hidp_unlink_session(session);
1111
1112 skb_queue_purge(&session->ctrl_transmit);
1113 skb_queue_purge(&session->intr_transmit);
1114
1115failed:
1116 up_write(&hidp_session_sem);
1117
1118 kfree(session);
1119 return err;
1120}
1121
1122int hidp_del_connection(struct hidp_conndel_req *req)
1123{
1124 struct hidp_session *session;
1125 int err = 0;
1126
1127 BT_DBG("");
1128
1129 down_read(&hidp_session_sem);
1130
1131 session = __hidp_get_session(&req->bdaddr);
1132 if (session) {
1133 if (req->flags & (1 << HIDP_VIRTUAL_CABLE_UNPLUG)) {
1134 hidp_send_ctrl_message(session,
1135 HIDP_TRANS_HID_CONTROL | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG, NULL, 0);
1136 } else {
1137 /* Flush the transmit queues */
1138 skb_queue_purge(&session->ctrl_transmit);
1139 skb_queue_purge(&session->intr_transmit);
1140
1141 atomic_inc(&session->terminate);
1142 wake_up_process(session->task);
1143 }
1144 } else
1145 err = -ENOENT;
1146
1147 up_read(&hidp_session_sem);
1148 return err;
1149}
1150
1151int hidp_get_connlist(struct hidp_connlist_req *req)
1152{
1153 struct hidp_session *session;
1154 int err = 0, n = 0;
1155
1156 BT_DBG("");
1157
1158 down_read(&hidp_session_sem);
1159
1160 list_for_each_entry(session, &hidp_session_list, list) {
1161 struct hidp_conninfo ci;
1162
1163 __hidp_copy_session(session, &ci);
1164
1165 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
1166 err = -EFAULT;
1167 break;
1168 }
1169
1170 if (++n >= req->cnum)
1171 break;
1172
1173 req->ci++;
1174 }
1175 req->cnum = n;
1176
1177 up_read(&hidp_session_sem);
1178 return err;
1179}
1180
1181int hidp_get_conninfo(struct hidp_conninfo *ci)
1182{
1183 struct hidp_session *session;
1184 int err = 0;
1185
1186 down_read(&hidp_session_sem);
1187
1188 session = __hidp_get_session(&ci->bdaddr);
1189 if (session)
1190 __hidp_copy_session(session, ci);
1191 else
1192 err = -ENOENT;
1193
1194 up_read(&hidp_session_sem);
1195 return err;
1196}
1197
1198static int __init hidp_init(void)
1199{
1200 BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);
1201
1202 return hidp_init_sockets();
1203}
1204
1205static void __exit hidp_exit(void)
1206{
1207 hidp_cleanup_sockets();
1208}
1209
1210module_init(hidp_init);
1211module_exit(hidp_exit);
1212
1213MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1214MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
1215MODULE_VERSION(VERSION);
1216MODULE_LICENSE("GPL");
1217MODULE_ALIAS("bt-proto-6");