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