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