summaryrefslogtreecommitdiffstats
path: root/net/nfc/hci/core.c
blob: 052a0a27ac1a59410cf6f62450040c00d6d6b553 (plain)
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
/*
 * Copyright (C) 2012  Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#define pr_fmt(fmt) "hci: %s: " fmt, __func__

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/nfc.h>

#include <net/nfc/nfc.h>
#include <net/nfc/hci.h>
#include <net/nfc/llc.h>

#include "hci.h"

/* Largest headroom needed for outgoing HCI commands */
#define HCI_CMDS_HEADROOM 1

static int nfc_hci_result_to_errno(u8 result)
{
	switch (result) {
	case NFC_HCI_ANY_OK:
		return 0;
	case NFC_HCI_ANY_E_TIMEOUT:
		return -ETIME;
	default:
		return -1;
	}
}

static void nfc_hci_msg_tx_work(struct work_struct *work)
{
	struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
						msg_tx_work);
	struct hci_msg *msg;
	struct sk_buff *skb;
	int r = 0;

	mutex_lock(&hdev->msg_tx_mutex);

	if (hdev->cmd_pending_msg) {
		if (timer_pending(&hdev->cmd_timer) == 0) {
			if (hdev->cmd_pending_msg->cb)
				hdev->cmd_pending_msg->cb(hdev->
							  cmd_pending_msg->
							  cb_context,
							  NULL,
							  -ETIME);
			kfree(hdev->cmd_pending_msg);
			hdev->cmd_pending_msg = NULL;
		} else
			goto exit;
	}

next_msg:
	if (list_empty(&hdev->msg_tx_queue))
		goto exit;

	msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
	list_del(&msg->msg_l);

	pr_debug("msg_tx_queue has a cmd to send\n");
	while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
		r = nfc_llc_xmit_from_hci(hdev->llc, skb);
		if (r < 0) {
			kfree_skb(skb);
			skb_queue_purge(&msg->msg_frags);
			if (msg->cb)
				msg->cb(msg->cb_context, NULL, r);
			kfree(msg);
			break;
		}
	}

	if (r)
		goto next_msg;

	if (msg->wait_response == false) {
		kfree(msg);
		goto next_msg;
	}

	hdev->cmd_pending_msg = msg;
	mod_timer(&hdev->cmd_timer, jiffies +
		  msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));

exit:
	mutex_unlock(&hdev->msg_tx_mutex);
}

static void nfc_hci_msg_rx_work(struct work_struct *work)
{
	struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
						msg_rx_work);
	struct sk_buff *skb;
	struct hcp_message *message;
	u8 pipe;
	u8 type;
	u8 instruction;

	while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
		pipe = skb->data[0];
		skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
		message = (struct hcp_message *)skb->data;
		type = HCP_MSG_GET_TYPE(message->header);
		instruction = HCP_MSG_GET_CMD(message->header);
		skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);

		nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
	}
}

static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
				     struct sk_buff *skb)
{
	del_timer_sync(&hdev->cmd_timer);

	if (hdev->cmd_pending_msg->cb)
		hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
					  skb, err);
	else
		kfree_skb(skb);

	kfree(hdev->cmd_pending_msg);
	hdev->cmd_pending_msg = NULL;

	schedule_work(&hdev->msg_tx_work);
}

void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
			   struct sk_buff *skb)
{
	mutex_lock(&hdev->msg_tx_mutex);

	if (hdev->cmd_pending_msg == NULL) {
		kfree_skb(skb);
		goto exit;
	}

	__nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);

exit:
	mutex_unlock(&hdev->msg_tx_mutex);
}

void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
			  struct sk_buff *skb)
{
	kfree_skb(skb);
}

static u32 nfc_hci_sak_to_protocol(u8 sak)
{
	switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
	case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
		return NFC_PROTO_MIFARE_MASK;
	case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
		return NFC_PROTO_ISO14443_MASK;
	case NFC_HCI_TYPE_A_SEL_PROT_DEP:
		return NFC_PROTO_NFC_DEP_MASK;
	case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
		return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
	default:
		return 0xffffffff;
	}
}

int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
{
	struct nfc_target *targets;
	struct sk_buff *atqa_skb = NULL;
	struct sk_buff *sak_skb = NULL;
	struct sk_buff *uid_skb = NULL;
	int r;

	pr_debug("from gate %d\n", gate);

	targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
	if (targets == NULL)
		return -ENOMEM;

	switch (gate) {
	case NFC_HCI_RF_READER_A_GATE:
		r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
				      NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
		if (r < 0)
			goto exit;

		r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
				      NFC_HCI_RF_READER_A_SAK, &sak_skb);
		if (r < 0)
			goto exit;

		if (atqa_skb->len != 2 || sak_skb->len != 1) {
			r = -EPROTO;
			goto exit;
		}

		targets->supported_protocols =
				nfc_hci_sak_to_protocol(sak_skb->data[0]);
		if (targets->supported_protocols == 0xffffffff) {
			r = -EPROTO;
			goto exit;
		}

		targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
		targets->sel_res = sak_skb->data[0];

		r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
				      NFC_HCI_RF_READER_A_UID, &uid_skb);
		if (r < 0)
			goto exit;

		if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
			r = -EPROTO;
			goto exit;
		}

		memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
		targets->nfcid1_len = uid_skb->len;

		if (hdev->ops->complete_target_discovered) {
			r = hdev->ops->complete_target_discovered(hdev, gate,
								  targets);
			if (r < 0)
				goto exit;
		}
		break;
	case NFC_HCI_RF_READER_B_GATE:
		targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
		break;
	default:
		if (hdev->ops->target_from_gate)
			r = hdev->ops->target_from_gate(hdev, gate, targets);
		else
			r = -EPROTO;
		if (r < 0)
			goto exit;

		if (hdev->ops->complete_target_discovered) {
			r = hdev->ops->complete_target_discovered(hdev, gate,
								  targets);
			if (r < 0)
				goto exit;
		}
		break;
	}

	/* if driver set the new gate, we will skip the old one */
	if (targets->hci_reader_gate == 0x00)
		targets->hci_reader_gate = gate;

	r = nfc_targets_found(hdev->ndev, targets, 1);

exit:
	kfree(targets);
	kfree_skb(atqa_skb);
	kfree_skb(sak_skb);
	kfree_skb(uid_skb);

	return r;
}
EXPORT_SYMBOL(nfc_hci_target_discovered);

void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
			    struct sk_buff *skb)
{
	int r = 0;

	switch (event) {
	case NFC_HCI_EVT_TARGET_DISCOVERED:
		if (skb->len < 1) {	/* no status data? */
			r = -EPROTO;
			goto exit;
		}

		if (skb->data[0] == 3) {
			/* TODO: Multiple targets in field, none activated
			 * poll is supposedly stopped, but there is no
			 * single target to activate, so nothing to report
			 * up.
			 * if we need to restart poll, we must save the
			 * protocols from the initial poll and reuse here.
			 */
		}

		if (skb->data[0] != 0) {
			r = -EPROTO;
			goto exit;
		}

		r = nfc_hci_target_discovered(hdev,
					      nfc_hci_pipe2gate(hdev, pipe));
		break;
	default:
		if (hdev->ops->event_received) {
			hdev->ops->event_received(hdev,
						nfc_hci_pipe2gate(hdev, pipe),
						event, skb);
			return;
		}

		break;
	}

exit:
	kfree_skb(skb);

	if (r) {
		/* TODO: There was an error dispatching the event,
		 * how to propagate up to nfc core?
		 */
	}
}

static void nfc_hci_cmd_timeout(unsigned long data)
{
	struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;

	schedule_work(&hdev->msg_tx_work);
}

static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
				 struct nfc_hci_gate *gates)
{
	int r;
	while (gate_count--) {
		r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
					 gates->gate, gates->pipe);
		if (r < 0)
			return r;
		gates++;
	}

	return 0;
}

static int hci_dev_session_init(struct nfc_hci_dev *hdev)
{
	struct sk_buff *skb = NULL;
	int r;

	if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
		return -EPROTO;

	r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
				 hdev->init_data.gates[0].gate,
				 hdev->init_data.gates[0].pipe);
	if (r < 0)
		goto exit;

	r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
			      NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
	if (r < 0)
		goto disconnect_all;

	if (skb->len && skb->len == strlen(hdev->init_data.session_id))
		if (memcmp(hdev->init_data.session_id, skb->data,
			   skb->len) == 0) {
			/* TODO ELa: restore gate<->pipe table from
			 * some TBD location.
			 * note: it doesn't seem possible to get the chip
			 * currently open gate/pipe table.
			 * It is only possible to obtain the supported
			 * gate list.
			 */

			/* goto exit
			 * For now, always do a full initialization */
		}

	r = nfc_hci_disconnect_all_gates(hdev);
	if (r < 0)
		goto exit;

	r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
				  hdev->init_data.gates);
	if (r < 0)
		goto disconnect_all;

	r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
			      NFC_HCI_ADMIN_SESSION_IDENTITY,
			      hdev->init_data.session_id,
			      strlen(hdev->init_data.session_id));
	if (r == 0)
		goto exit;

disconnect_all:
	nfc_hci_disconnect_all_gates(hdev);

exit:
	kfree_skb(skb);

	return r;
}

static int hci_dev_version(struct nfc_hci_dev *hdev)
{
	int r;
	struct sk_buff *skb;

	r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
			      NFC_HCI_ID_MGMT_VERSION_SW, &skb);
	if (r < 0)
		return r;

	if (skb->len != 3) {
		kfree_skb(skb);
		return -EINVAL;
	}

	hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
	hdev->sw_patch = skb->data[0] & 0x0f;
	hdev->sw_flashlib_major = skb->data[1];
	hdev->sw_flashlib_minor = skb->data[2];

	kfree_skb(skb);

	r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
			      NFC_HCI_ID_MGMT_VERSION_HW, &skb);
	if (r < 0)
		return r;

	if (skb->len != 3) {
		kfree_skb(skb);
		return -EINVAL;
	}

	hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
	hdev->hw_version = skb->data[0] & 0x1f;
	hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
	hdev->hw_software = skb->data[1] & 0x3f;
	hdev->hw_bsid = skb->data[2];

	kfree_skb(skb);

	pr_info("SOFTWARE INFO:\n");
	pr_info("RomLib         : %d\n", hdev->sw_romlib);
	pr_info("Patch          : %d\n", hdev->sw_patch);
	pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
	pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
	pr_info("HARDWARE INFO:\n");
	pr_info("Derivative     : %d\n", hdev->hw_derivative);
	pr_info("HW Version     : %d\n", hdev->hw_version);
	pr_info("#MPW           : %d\n", hdev->hw_mpw);
	pr_info("Software       : %d\n", hdev->hw_software);
	pr_info("BSID Version   : %d\n", hdev->hw_bsid);

	return 0;
}

static int hci_dev_up(struct nfc_dev *nfc_dev)
{
	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
	int r = 0;

	if (hdev->ops->open) {
		r = hdev->ops->open(hdev);
		if (r < 0)
			return r;
	}

	r = nfc_llc_start(hdev->llc);
	if (r < 0)
		goto exit_close;

	r = hci_dev_session_init(hdev);
	if (r < 0)
		goto exit_llc;

	r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
			       NFC_HCI_EVT_END_OPERATION, NULL, 0);
	if (r < 0)
		goto exit_llc;

	if (hdev->ops->hci_ready) {
		r = hdev->ops->hci_ready(hdev);
		if (r < 0)
			goto exit_llc;
	}

	r = hci_dev_version(hdev);
	if (r < 0)
		goto exit_llc;

	return 0;

exit_llc:
	nfc_llc_stop(hdev->llc);

exit_close:
	if (hdev->ops->close)
		hdev->ops->close(hdev);

	return r;
}

static int hci_dev_down(struct nfc_dev *nfc_dev)
{
	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);

	nfc_llc_stop(hdev->llc);

	if (hdev->ops->close)
		hdev->ops->close(hdev);

	memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));

	return 0;
}

static int hci_start_poll(struct nfc_dev *nfc_dev,
			  u32 im_protocols, u32 tm_protocols)
{
	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);

	if (hdev->ops->start_poll)
		return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
	else
		return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
				       NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
}

static void hci_stop_poll(struct nfc_dev *nfc_dev)
{
	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);

	nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
			   NFC_HCI_EVT_END_OPERATION, NULL, 0);
}

static int hci_activate_target(struct nfc_dev *nfc_dev,
			       struct nfc_target *target, u32 protocol)
{
	return 0;
}

static void hci_deactivate_target(struct nfc_dev *nfc_dev,
				  struct nfc_target *target)
{
}

#define HCI_CB_TYPE_TRANSCEIVE 1

static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
{
	struct nfc_hci_dev *hdev = context;

	switch (hdev->async_cb_type) {
	case HCI_CB_TYPE_TRANSCEIVE:
		/*
		 * TODO: Check RF Error indicator to make sure data is valid.
		 * It seems that HCI cmd can complete without error, but data
		 * can be invalid if an RF error occured? Ignore for now.
		 */
		if (err == 0)
			skb_trim(skb, skb->len - 1); /* RF Err ind */

		hdev->async_cb(hdev->async_cb_context, skb, err);
		break;
	default:
		if (err == 0)
			kfree_skb(skb);
		break;
	}
}

static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
			  struct sk_buff *skb, data_exchange_cb_t cb,
			  void *cb_context)
{
	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
	int r;

	pr_debug("target_idx=%d\n", target->idx);

	switch (target->hci_reader_gate) {
	case NFC_HCI_RF_READER_A_GATE:
	case NFC_HCI_RF_READER_B_GATE:
		if (hdev->ops->data_exchange) {
			r = hdev->ops->data_exchange(hdev, target, skb, cb,
						     cb_context);
			if (r <= 0)	/* handled */
				break;
		}

		*skb_push(skb, 1) = 0;	/* CTR, see spec:10.2.2.1 */

		hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
		hdev->async_cb = cb;
		hdev->async_cb_context = cb_context;

		r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
					   NFC_HCI_WR_XCHG_DATA, skb->data,
					   skb->len, hci_transceive_cb, hdev);
		break;
	default:
		if (hdev->ops->data_exchange) {
			r = hdev->ops->data_exchange(hdev, target, skb, cb,
						     cb_context);
			if (r == 1)
				r = -ENOTSUPP;
		}
		else
			r = -ENOTSUPP;
		break;
	}

	kfree_skb(skb);

	return r;
}

static int hci_check_presence(struct nfc_dev *nfc_dev,
			      struct nfc_target *target)
{
	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);

	if (hdev->ops->check_presence)
		return hdev->ops->check_presence(hdev, target);

	return 0;
}

static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
{
	mutex_lock(&hdev->msg_tx_mutex);

	if (hdev->cmd_pending_msg == NULL) {
		nfc_driver_failure(hdev->ndev, err);
		goto exit;
	}

	__nfc_hci_cmd_completion(hdev, err, NULL);

exit:
	mutex_unlock(&hdev->msg_tx_mutex);
}

static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
{
	nfc_hci_failure(hdev, err);
}

static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
	struct hcp_packet *packet;
	u8 type;
	u8 instruction;
	struct sk_buff *hcp_skb;
	u8 pipe;
	struct sk_buff *frag_skb;
	int msg_len;

	packet = (struct hcp_packet *)skb->data;
	if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
		skb_queue_tail(&hdev->rx_hcp_frags, skb);
		return;
	}

	/* it's the last fragment. Does it need re-aggregation? */
	if (skb_queue_len(&hdev->rx_hcp_frags)) {
		pipe = packet->header & NFC_HCI_FRAGMENT;
		skb_queue_tail(&hdev->rx_hcp_frags, skb);

		msg_len = 0;
		skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
			msg_len += (frag_skb->len -
				    NFC_HCI_HCP_PACKET_HEADER_LEN);
		}

		hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
					     msg_len, GFP_KERNEL);
		if (hcp_skb == NULL) {
			nfc_hci_failure(hdev, -ENOMEM);
			return;
		}

		*skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;

		skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
			msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
			memcpy(skb_put(hcp_skb, msg_len),
			       frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
			       msg_len);
		}

		skb_queue_purge(&hdev->rx_hcp_frags);
	} else {
		packet->header &= NFC_HCI_FRAGMENT;
		hcp_skb = skb;
	}

	/* if this is a response, dispatch immediately to
	 * unblock waiting cmd context. Otherwise, enqueue to dispatch
	 * in separate context where handler can also execute command.
	 */
	packet = (struct hcp_packet *)hcp_skb->data;
	type = HCP_MSG_GET_TYPE(packet->message.header);
	if (type == NFC_HCI_HCP_RESPONSE) {
		pipe = packet->header;
		instruction = HCP_MSG_GET_CMD(packet->message.header);
		skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
			 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
		nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
	} else {
		skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
		schedule_work(&hdev->msg_rx_work);
	}
}

static struct nfc_ops hci_nfc_ops = {
	.dev_up = hci_dev_up,
	.dev_down = hci_dev_down,
	.start_poll = hci_start_poll,
	.stop_poll = hci_stop_poll,
	.activate_target = hci_activate_target,
	.deactivate_target = hci_deactivate_target,
	.im_transceive = hci_transceive,
	.check_presence = hci_check_presence,
};

struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
					    struct nfc_hci_init_data *init_data,
					    u32 protocols,
					    const char *llc_name,
					    int tx_headroom,
					    int tx_tailroom,
					    int max_link_payload)
{
	struct nfc_hci_dev *hdev;

	if (ops->xmit == NULL)
		return NULL;

	if (protocols == 0)
		return NULL;

	hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
	if (hdev == NULL)
		return NULL;

	hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
				     nfc_hci_recv_from_llc, tx_headroom,
				     tx_tailroom, nfc_hci_llc_failure);
	if (hdev->llc == NULL) {
		kfree(hdev);
		return NULL;
	}

	hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
					 tx_headroom + HCI_CMDS_HEADROOM,
					 tx_tailroom);
	if (!hdev->ndev) {
		nfc_llc_free(hdev->llc);
		kfree(hdev);
		return NULL;
	}

	hdev->ops = ops;
	hdev->max_data_link_payload = max_link_payload;
	hdev->init_data = *init_data;

	nfc_set_drvdata(hdev->ndev, hdev);

	memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));

	return hdev;
}
EXPORT_SYMBOL(nfc_hci_allocate_device);

void nfc_hci_free_device(struct nfc_hci_dev *hdev)
{
	nfc_free_device(hdev->ndev);
	nfc_llc_free(hdev->llc);
	kfree(hdev);
}
EXPORT_SYMBOL(nfc_hci_free_device);

int nfc_hci_register_device(struct nfc_hci_dev *hdev)
{
	mutex_init(&hdev->msg_tx_mutex);

	INIT_LIST_HEAD(&hdev->msg_tx_queue);

	INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);

	init_timer(&hdev->cmd_timer);
	hdev->cmd_timer.data = (unsigned long)hdev;
	hdev->cmd_timer.function = nfc_hci_cmd_timeout;

	skb_queue_head_init(&hdev->rx_hcp_frags);

	INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);

	skb_queue_head_init(&hdev->msg_rx_queue);

	return nfc_register_device(hdev->ndev);
}
EXPORT_SYMBOL(nfc_hci_register_device);

void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
{
	struct hci_msg *msg, *n;

	skb_queue_purge(&hdev->rx_hcp_frags);
	skb_queue_purge(&hdev->msg_rx_queue);

	list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
		list_del(&msg->msg_l);
		skb_queue_purge(&msg->msg_frags);
		kfree(msg);
	}

	del_timer_sync(&hdev->cmd_timer);

	nfc_unregister_device(hdev->ndev);

	cancel_work_sync(&hdev->msg_tx_work);
	cancel_work_sync(&hdev->msg_rx_work);
}
EXPORT_SYMBOL(nfc_hci_unregister_device);

void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
{
	hdev->clientdata = clientdata;
}
EXPORT_SYMBOL(nfc_hci_set_clientdata);

void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
{
	return hdev->clientdata;
}
EXPORT_SYMBOL(nfc_hci_get_clientdata);

void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
{
	nfc_hci_failure(hdev, err);
}
EXPORT_SYMBOL(nfc_hci_driver_failure);

void inline nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
	nfc_llc_rcv_from_drv(hdev->llc, skb);
}
EXPORT_SYMBOL(nfc_hci_recv_frame);

static int __init nfc_hci_init(void)
{
	return nfc_llc_init();
}

static void __exit nfc_hci_exit(void)
{
	nfc_llc_exit();
}

subsys_initcall(nfc_hci_init);
module_exit(nfc_hci_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("NFC HCI Core");