aboutsummaryrefslogtreecommitdiffstats
path: root/net/bluetooth/hidp/core.c
blob: 519cdb920f936bb7882d8400bccb8105c5d0d4f5 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
/*
   HIDP implementation for Linux Bluetooth stack (BlueZ).
   Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
   SOFTWARE IS DISCLAIMED.
*/

#include <linux/module.h>

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/freezer.h>
#include <linux/fcntl.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/ioctl.h>
#include <linux/file.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <net/sock.h>

#include <linux/input.h>
#include <linux/hid.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/l2cap.h>

#include "hidp.h"

#ifndef CONFIG_BT_HIDP_DEBUG
#undef  BT_DBG
#define BT_DBG(D...)
#endif

#define VERSION "1.2"

static DECLARE_RWSEM(hidp_session_sem);
static LIST_HEAD(hidp_session_list);

static unsigned char hidp_keycode[256] = {
	  0,  0,  0,  0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 37, 38,
	 50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 21, 44,  2,  3,
	  4,  5,  6,  7,  8,  9, 10, 11, 28,  1, 14, 15, 57, 12, 13, 26,
	 27, 43, 43, 39, 40, 41, 51, 52, 53, 58, 59, 60, 61, 62, 63, 64,
	 65, 66, 67, 68, 87, 88, 99, 70,119,110,102,104,111,107,109,106,
	105,108,103, 69, 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71,
	 72, 73, 82, 83, 86,127,116,117,183,184,185,186,187,188,189,190,
	191,192,193,194,134,138,130,132,128,129,131,137,133,135,136,113,
	115,114,  0,  0,  0,121,  0, 89, 93,124, 92, 94, 95,  0,  0,  0,
	122,123, 90, 91, 85,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
	  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
	  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
	  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
	  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
	 29, 42, 56,125, 97, 54,100,126,164,166,165,163,161,115,114,113,
	150,158,159,128,136,177,178,176,142,152,173,140
};

static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 };

static struct hidp_session *__hidp_get_session(bdaddr_t *bdaddr)
{
	struct hidp_session *session;
	struct list_head *p;

	BT_DBG("");

	list_for_each(p, &hidp_session_list) {
		session = list_entry(p, struct hidp_session, list);
		if (!bacmp(bdaddr, &session->bdaddr))
			return session;
	}
	return NULL;
}

static void __hidp_link_session(struct hidp_session *session)
{
	__module_get(THIS_MODULE);
	list_add(&session->list, &hidp_session_list);
}

static void __hidp_unlink_session(struct hidp_session *session)
{
	list_del(&session->list);
	module_put(THIS_MODULE);
}

static void __hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
{
	bacpy(&ci->bdaddr, &session->bdaddr);

	ci->flags = session->flags;
	ci->state = session->state;

	ci->vendor  = 0x0000;
	ci->product = 0x0000;
	ci->version = 0x0000;
	memset(ci->name, 0, 128);

	if (session->input) {
		ci->vendor  = session->input->id.vendor;
		ci->product = session->input->id.product;
		ci->version = session->input->id.version;
		if (session->input->name)
			strncpy(ci->name, session->input->name, 128);
		else
			strncpy(ci->name, "HID Boot Device", 128);
	}

	if (session->hid) {
		ci->vendor  = session->hid->vendor;
		ci->product = session->hid->product;
		ci->version = session->hid->version;
		strncpy(ci->name, session->hid->name, 128);
	}
}

static int hidp_queue_event(struct hidp_session *session, struct input_dev *dev,
				unsigned int type, unsigned int code, int value)
{
	unsigned char newleds;
	struct sk_buff *skb;

	BT_DBG("session %p type %d code %d value %d", session, type, code, value);

	if (type != EV_LED)
		return -1;

	newleds = (!!test_bit(LED_KANA,    dev->led) << 3) |
		  (!!test_bit(LED_COMPOSE, dev->led) << 3) |
		  (!!test_bit(LED_SCROLLL, dev->led) << 2) |
		  (!!test_bit(LED_CAPSL,   dev->led) << 1) |
		  (!!test_bit(LED_NUML,    dev->led));

	if (session->leds == newleds)
		return 0;

	session->leds = newleds;

	if (!(skb = alloc_skb(3, GFP_ATOMIC))) {
		BT_ERR("Can't allocate memory for new frame");
		return -ENOMEM;
	}

	*skb_put(skb, 1) = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
	*skb_put(skb, 1) = 0x01;
	*skb_put(skb, 1) = newleds;

	skb_queue_tail(&session->intr_transmit, skb);

	hidp_schedule(session);

	return 0;
}

static int hidp_hidinput_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
	struct hid_device *hid = input_get_drvdata(dev);
	struct hidp_session *session = hid->driver_data;

	return hidp_queue_event(session, dev, type, code, value);
}

static int hidp_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
	struct hidp_session *session = input_get_drvdata(dev);

	return hidp_queue_event(session, dev, type, code, value);
}

static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb)
{
	struct input_dev *dev = session->input;
	unsigned char *keys = session->keys;
	unsigned char *udata = skb->data + 1;
	signed char *sdata = skb->data + 1;
	int i, size = skb->len - 1;

	switch (skb->data[0]) {
	case 0x01:	/* Keyboard report */
		for (i = 0; i < 8; i++)
			input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1);

		/* If all the key codes have been set to 0x01, it means
		 * too many keys were pressed at the same time. */
		if (!memcmp(udata + 2, hidp_mkeyspat, 6))
			break;

		for (i = 2; i < 8; i++) {
			if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) {
				if (hidp_keycode[keys[i]])
					input_report_key(dev, hidp_keycode[keys[i]], 0);
				else
					BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
			}

			if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) {
				if (hidp_keycode[udata[i]])
					input_report_key(dev, hidp_keycode[udata[i]], 1);
				else
					BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]);
			}
		}

		memcpy(keys, udata, 8);
		break;

	case 0x02:	/* Mouse report */
		input_report_key(dev, BTN_LEFT,   sdata[0] & 0x01);
		input_report_key(dev, BTN_RIGHT,  sdata[0] & 0x02);
		input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04);
		input_report_key(dev, BTN_SIDE,   sdata[0] & 0x08);
		input_report_key(dev, BTN_EXTRA,  sdata[0] & 0x10);

		input_report_rel(dev, REL_X, sdata[1]);
		input_report_rel(dev, REL_Y, sdata[2]);

		if (size > 3)
			input_report_rel(dev, REL_WHEEL, sdata[3]);
		break;
	}

	input_sync(dev);
}

static int hidp_queue_report(struct hidp_session *session,
				unsigned char *data, int size)
{
	struct sk_buff *skb;

	BT_DBG("session %p hid %p data %p size %d", session, session->hid, data, size);

	if (!(skb = alloc_skb(size + 1, GFP_ATOMIC))) {
		BT_ERR("Can't allocate memory for new frame");
		return -ENOMEM;
	}

	*skb_put(skb, 1) = 0xa2;
	if (size > 0)
		memcpy(skb_put(skb, size), data, size);

	skb_queue_tail(&session->intr_transmit, skb);

	hidp_schedule(session);

	return 0;
}

static int hidp_send_report(struct hidp_session *session, struct hid_report *report)
{
	unsigned char buf[32];
	int rsize;

	rsize = ((report->size - 1) >> 3) + 1 + (report->id > 0);
	if (rsize > sizeof(buf))
		return -EIO;

	hid_output_report(report, buf);

	return hidp_queue_report(session, buf, rsize);
}

static void hidp_idle_timeout(unsigned long arg)
{
	struct hidp_session *session = (struct hidp_session *) arg;

	atomic_inc(&session->terminate);
	hidp_schedule(session);
}

static void hidp_set_timer(struct hidp_session *session)
{
	if (session->idle_to > 0)
		mod_timer(&session->timer, jiffies + HZ * session->idle_to);
}

static inline void hidp_del_timer(struct hidp_session *session)
{
	if (session->idle_to > 0)
		del_timer(&session->timer);
}

static int __hidp_send_ctrl_message(struct hidp_session *session,
			unsigned char hdr, unsigned char *data, int size)
{
	struct sk_buff *skb;

	BT_DBG("session %p data %p size %d", session, data, size);

	if (!(skb = alloc_skb(size + 1, GFP_ATOMIC))) {
		BT_ERR("Can't allocate memory for new frame");
		return -ENOMEM;
	}

	*skb_put(skb, 1) = hdr;
	if (data && size > 0)
		memcpy(skb_put(skb, size), data, size);

	skb_queue_tail(&session->ctrl_transmit, skb);

	return 0;
}

static inline int hidp_send_ctrl_message(struct hidp_session *session,
			unsigned char hdr, unsigned char *data, int size)
{
	int err;

	err = __hidp_send_ctrl_message(session, hdr, data, size);

	hidp_schedule(session);

	return err;
}

static void hidp_process_handshake(struct hidp_session *session,
					unsigned char param)
{
	BT_DBG("session %p param 0x%02x", session, param);

	switch (param) {
	case HIDP_HSHK_SUCCESSFUL:
		/* FIXME: Call into SET_ GET_ handlers here */
		break;

	case HIDP_HSHK_NOT_READY:
	case HIDP_HSHK_ERR_INVALID_REPORT_ID:
	case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST:
	case HIDP_HSHK_ERR_INVALID_PARAMETER:
		/* FIXME: Call into SET_ GET_ handlers here */
		break;

	case HIDP_HSHK_ERR_UNKNOWN:
		break;

	case HIDP_HSHK_ERR_FATAL:
		/* Device requests a reboot, as this is the only way this error
		 * can be recovered. */
		__hidp_send_ctrl_message(session,
			HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0);
		break;

	default:
		__hidp_send_ctrl_message(session,
			HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
		break;
	}
}

static void hidp_process_hid_control(struct hidp_session *session,
					unsigned char param)
{
	BT_DBG("session %p param 0x%02x", session, param);

	if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) {
		/* Flush the transmit queues */
		skb_queue_purge(&session->ctrl_transmit);
		skb_queue_purge(&session->intr_transmit);

		/* Kill session thread */
		atomic_inc(&session->terminate);
	}
}

static void hidp_process_data(struct hidp_session *session, struct sk_buff *skb,
				unsigned char param)
{
	BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param);

	switch (param) {
	case HIDP_DATA_RTYPE_INPUT:
		hidp_set_timer(session);

		if (session->input)
			hidp_input_report(session, skb);

		if (session->hid)
			hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 0);

		break;

	case HIDP_DATA_RTYPE_OTHER:
	case HIDP_DATA_RTYPE_OUPUT:
	case HIDP_DATA_RTYPE_FEATURE:
		break;

	default:
		__hidp_send_ctrl_message(session,
			HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
	}
}

static void hidp_recv_ctrl_frame(struct hidp_session *session,
					struct sk_buff *skb)
{
	unsigned char hdr, type, param;

	BT_DBG("session %p skb %p len %d", session, skb, skb->len);

	hdr = skb->data[0];
	skb_pull(skb, 1);

	type = hdr & HIDP_HEADER_TRANS_MASK;
	param = hdr & HIDP_HEADER_PARAM_MASK;

	switch (type) {
	case HIDP_TRANS_HANDSHAKE:
		hidp_process_handshake(session, param);
		break;

	case HIDP_TRANS_HID_CONTROL:
		hidp_process_hid_control(session, param);
		break;

	case HIDP_TRANS_DATA:
		hidp_process_data(session, skb, param);
		break;

	default:
		__hidp_send_ctrl_message(session,
			HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0);
		break;
	}

	kfree_skb(skb);
}

static void hidp_recv_intr_frame(struct hidp_session *session,
				struct sk_buff *skb)
{
	unsigned char hdr;

	BT_DBG("session %p skb %p len %d", session, skb, skb->len);

	hdr = skb->data[0];
	skb_pull(skb, 1);

	if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) {
		hidp_set_timer(session);

		if (session->input)
			hidp_input_report(session, skb);

		if (session->hid) {
			hid_input_report(session->hid, HID_INPUT_REPORT, skb->data, skb->len, 1);
			BT_DBG("report len %d", skb->len);
		}
	} else {
		BT_DBG("Unsupported protocol header 0x%02x", hdr);
	}

	kfree_skb(skb);
}

static int hidp_send_frame(struct socket *sock, unsigned char *data, int len)
{
	struct kvec iv = { data, len };
	struct msghdr msg;

	BT_DBG("sock %p data %p len %d", sock, data, len);

	if (!len)
		return 0;

	memset(&msg, 0, sizeof(msg));

	return kernel_sendmsg(sock, &msg, &iv, 1, len);
}

static void hidp_process_transmit(struct hidp_session *session)
{
	struct sk_buff *skb;

	BT_DBG("session %p", session);

	while ((skb = skb_dequeue(&session->ctrl_transmit))) {
		if (hidp_send_frame(session->ctrl_sock, skb->data, skb->len) < 0) {
			skb_queue_head(&session->ctrl_transmit, skb);
			break;
		}

		hidp_set_timer(session);
		kfree_skb(skb);
	}

	while ((skb = skb_dequeue(&session->intr_transmit))) {
		if (hidp_send_frame(session->intr_sock, skb->data, skb->len) < 0) {
			skb_queue_head(&session->intr_transmit, skb);
			break;
		}

		hidp_set_timer(session);
		kfree_skb(skb);
	}
}

static int hidp_session(void *arg)
{
	struct hidp_session *session = arg;
	struct sock *ctrl_sk = session->ctrl_sock->sk;
	struct sock *intr_sk = session->intr_sock->sk;
	struct sk_buff *skb;
	int vendor = 0x0000, product = 0x0000;
	wait_queue_t ctrl_wait, intr_wait;

	BT_DBG("session %p", session);

	if (session->input) {
		vendor  = session->input->id.vendor;
		product = session->input->id.product;
	}

	if (session->hid) {
		vendor  = session->hid->vendor;
		product = session->hid->product;
	}

	daemonize("khidpd_%04x%04x", vendor, product);
	set_user_nice(current, -15);

	init_waitqueue_entry(&ctrl_wait, current);
	init_waitqueue_entry(&intr_wait, current);
	add_wait_queue(ctrl_sk->sk_sleep, &ctrl_wait);
	add_wait_queue(intr_sk->sk_sleep, &intr_wait);
	while (!atomic_read(&session->terminate)) {
		set_current_state(TASK_INTERRUPTIBLE);

		if (ctrl_sk->sk_state != BT_CONNECTED || intr_sk->sk_state != BT_CONNECTED)
			break;

		while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
			skb_orphan(skb);
			hidp_recv_ctrl_frame(session, skb);
		}

		while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
			skb_orphan(skb);
			hidp_recv_intr_frame(session, skb);
		}

		hidp_process_transmit(session);

		schedule();
	}
	set_current_state(TASK_RUNNING);
	remove_wait_queue(intr_sk->sk_sleep, &intr_wait);
	remove_wait_queue(ctrl_sk->sk_sleep, &ctrl_wait);

	down_write(&hidp_session_sem);

	hidp_del_timer(session);

	if (session->input) {
		input_unregister_device(session->input);
		session->input = NULL;
	}

	if (session->hid) {
		if (session->hid->claimed & HID_CLAIMED_INPUT)
			hidinput_disconnect(session->hid);
		hid_free_device(session->hid);
	}

	fput(session->intr_sock->file);

	wait_event_timeout(*(ctrl_sk->sk_sleep),
		(ctrl_sk->sk_state == BT_CLOSED), msecs_to_jiffies(500));

	fput(session->ctrl_sock->file);

	__hidp_unlink_session(session);

	up_write(&hidp_session_sem);

	kfree(session);
	return 0;
}

static struct device *hidp_get_device(struct hidp_session *session)
{
	bdaddr_t *src = &bt_sk(session->ctrl_sock->sk)->src;
	bdaddr_t *dst = &bt_sk(session->ctrl_sock->sk)->dst;
	struct hci_dev *hdev;
	struct hci_conn *conn;

	hdev = hci_get_route(dst, src);
	if (!hdev)
		return NULL;

	conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);

	hci_dev_put(hdev);

	return conn ? &conn->dev : NULL;
}

static int hidp_setup_input(struct hidp_session *session,
				struct hidp_connadd_req *req)
{
	struct input_dev *input = session->input;
	int i;

	input_set_drvdata(input, session);

	input->name = "Bluetooth HID Boot Protocol Device";

	input->id.bustype = BUS_BLUETOOTH;
	input->id.vendor  = req->vendor;
	input->id.product = req->product;
	input->id.version = req->version;

	if (req->subclass & 0x40) {
		set_bit(EV_KEY, input->evbit);
		set_bit(EV_LED, input->evbit);
		set_bit(EV_REP, input->evbit);

		set_bit(LED_NUML,    input->ledbit);
		set_bit(LED_CAPSL,   input->ledbit);
		set_bit(LED_SCROLLL, input->ledbit);
		set_bit(LED_COMPOSE, input->ledbit);
		set_bit(LED_KANA,    input->ledbit);

		for (i = 0; i < sizeof(hidp_keycode); i++)
			set_bit(hidp_keycode[i], input->keybit);
		clear_bit(0, input->keybit);
	}

	if (req->subclass & 0x80) {
		input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
		input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
			BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
		input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
		input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
			BIT_MASK(BTN_EXTRA);
		input->relbit[0] |= BIT_MASK(REL_WHEEL);
	}

	input->dev.parent = hidp_get_device(session);

	input->event = hidp_input_event;

	return input_register_device(input);
}

static int hidp_open(struct hid_device *hid)
{
	return 0;
}

static void hidp_close(struct hid_device *hid)
{
}

static const struct {
	__u16 idVendor;
	__u16 idProduct;
	unsigned quirks;
} hidp_blacklist[] = {
	/* Apple wireless Mighty Mouse */
	{ 0x05ac, 0x030c, HID_QUIRK_MIGHTYMOUSE | HID_QUIRK_INVERT_HWHEEL },

	{ }	/* Terminating entry */
};

static void hidp_setup_quirks(struct hid_device *hid)
{
	unsigned int n;

	for (n = 0; hidp_blacklist[n].idVendor; n++)
		if (hidp_blacklist[n].idVendor == le16_to_cpu(hid->vendor) &&
				hidp_blacklist[n].idProduct == le16_to_cpu(hid->product))
			hid->quirks = hidp_blacklist[n].quirks;
}

static void hidp_setup_hid(struct hidp_session *session,
				struct hidp_connadd_req *req)
{
	struct hid_device *hid = session->hid;
	struct hid_report *report;
	bdaddr_t src, dst;

	baswap(&src, &bt_sk(session->ctrl_sock->sk)->src);
	baswap(&dst, &bt_sk(session->ctrl_sock->sk)->dst);

	hid->driver_data = session;

	hid->country = req->country;

	hid->bus     = BUS_BLUETOOTH;
	hid->vendor  = req->vendor;
	hid->product = req->product;
	hid->version = req->version;

	strncpy(hid->name, req->name, 128);
	strncpy(hid->phys, batostr(&src), 64);
	strncpy(hid->uniq, batostr(&dst), 64);

	hid->dev = hidp_get_device(session);

	hid->hid_open  = hidp_open;
	hid->hid_close = hidp_close;

	hid->hidinput_input_event = hidp_hidinput_event;

	hidp_setup_quirks(hid);

	list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].report_list, list)
		hidp_send_report(session, report);

	list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].report_list, list)
		hidp_send_report(session, report);

	if (hidinput_connect(hid) == 0)
		hid->claimed |= HID_CLAIMED_INPUT;
}

int hidp_add_connection(struct hidp_connadd_req *req, struct socket *ctrl_sock, struct socket *intr_sock)
{
	struct hidp_session *session, *s;
	int err;

	BT_DBG("");

	if (bacmp(&bt_sk(ctrl_sock->sk)->src, &bt_sk(intr_sock->sk)->src) ||
			bacmp(&bt_sk(ctrl_sock->sk)->dst, &bt_sk(intr_sock->sk)->dst))
		return -ENOTUNIQ;

	session = kzalloc(sizeof(struct hidp_session), GFP_KERNEL);
	if (!session)
		return -ENOMEM;

	BT_DBG("rd_data %p rd_size %d", req->rd_data, req->rd_size);

	if (req->rd_size > 0) {
		unsigned char *buf = kmalloc(req->rd_size, GFP_KERNEL);

		if (!buf) {
			kfree(session);
			return -ENOMEM;
		}

		if (copy_from_user(buf, req->rd_data, req->rd_size)) {
			kfree(buf);
			kfree(session);
			return -EFAULT;
		}

		session->hid = hid_parse_report(buf, req->rd_size);

		kfree(buf);

		if (!session->hid) {
			kfree(session);
			return -EINVAL;
		}
	}

	if (!session->hid) {
		session->input = input_allocate_device();
		if (!session->input) {
			kfree(session);
			return -ENOMEM;
		}
	}

	down_write(&hidp_session_sem);

	s = __hidp_get_session(&bt_sk(ctrl_sock->sk)->dst);
	if (s && s->state == BT_CONNECTED) {
		err = -EEXIST;
		goto failed;
	}

	bacpy(&session->bdaddr, &bt_sk(ctrl_sock->sk)->dst);

	session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl_sock->sk)->omtu, l2cap_pi(ctrl_sock->sk)->imtu);
	session->intr_mtu = min_t(uint, l2cap_pi(intr_sock->sk)->omtu, l2cap_pi(intr_sock->sk)->imtu);

	BT_DBG("ctrl mtu %d intr mtu %d", session->ctrl_mtu, session->intr_mtu);

	session->ctrl_sock = ctrl_sock;
	session->intr_sock = intr_sock;
	session->state     = BT_CONNECTED;

	setup_timer(&session->timer, hidp_idle_timeout, (unsigned long)session);

	skb_queue_head_init(&session->ctrl_transmit);
	skb_queue_head_init(&session->intr_transmit);

	session->flags   = req->flags & (1 << HIDP_BLUETOOTH_VENDOR_ID);
	session->idle_to = req->idle_to;

	if (session->input) {
		err = hidp_setup_input(session, req);
		if (err < 0)
			goto failed;
	}

	if (session->hid)
		hidp_setup_hid(session, req);

	__hidp_link_session(session);

	hidp_set_timer(session);

	err = kernel_thread(hidp_session, session, CLONE_KERNEL);
	if (err < 0)
		goto unlink;

	if (session->input) {
		hidp_send_ctrl_message(session,
			HIDP_TRANS_SET_PROTOCOL | HIDP_PROTO_BOOT, NULL, 0);
		session->flags |= (1 << HIDP_BOOT_PROTOCOL_MODE);

		session->leds = 0xff;
		hidp_input_event(session->input, EV_LED, 0, 0);
	}

	up_write(&hidp_session_sem);
	return 0;

unlink:
	hidp_del_timer(session);

	__hidp_unlink_session(session);

	if (session->input) {
		input_unregister_device(session->input);
		session->input = NULL; /* don't try to free it here */
	}

failed:
	up_write(&hidp_session_sem);

	if (session->hid)
		hid_free_device(session->hid);

	input_free_device(session->input);
	kfree(session);
	return err;
}

int hidp_del_connection(struct hidp_conndel_req *req)
{
	struct hidp_session *session;
	int err = 0;

	BT_DBG("");

	down_read(&hidp_session_sem);

	session = __hidp_get_session(&req->bdaddr);
	if (session) {
		if (req->flags & (1 << HIDP_VIRTUAL_CABLE_UNPLUG)) {
			hidp_send_ctrl_message(session,
				HIDP_TRANS_HID_CONTROL | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG, NULL, 0);
		} else {
			/* Flush the transmit queues */
			skb_queue_purge(&session->ctrl_transmit);
			skb_queue_purge(&session->intr_transmit);

			/* Kill session thread */
			atomic_inc(&session->terminate);
			hidp_schedule(session);
		}
	} else
		err = -ENOENT;

	up_read(&hidp_session_sem);
	return err;
}

int hidp_get_connlist(struct hidp_connlist_req *req)
{
	struct list_head *p;
	int err = 0, n = 0;

	BT_DBG("");

	down_read(&hidp_session_sem);

	list_for_each(p, &hidp_session_list) {
		struct hidp_session *session;
		struct hidp_conninfo ci;

		session = list_entry(p, struct hidp_session, list);

		__hidp_copy_session(session, &ci);

		if (copy_to_user(req->ci, &ci, sizeof(ci))) {
			err = -EFAULT;
			break;
		}

		if (++n >= req->cnum)
			break;

		req->ci++;
	}
	req->cnum = n;

	up_read(&hidp_session_sem);
	return err;
}

int hidp_get_conninfo(struct hidp_conninfo *ci)
{
	struct hidp_session *session;
	int err = 0;

	down_read(&hidp_session_sem);

	session = __hidp_get_session(&ci->bdaddr);
	if (session)
		__hidp_copy_session(session, ci);
	else
		err = -ENOENT;

	up_read(&hidp_session_sem);
	return err;
}

static int __init hidp_init(void)
{
	l2cap_load();

	BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);

	return hidp_init_sockets();
}

static void __exit hidp_exit(void)
{
	hidp_cleanup_sockets();
}

module_init(hidp_init);
module_exit(hidp_exit);

MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_ALIAS("bt-proto-6");