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