summaryrefslogtreecommitdiff
path: root/net/nfc/digital_core.c
blob: 28c60e291c7eeeef4541ce5a8e4db85707068c6a (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
/*
 * NFC Digital Protocol stack
 * Copyright (c) 2013, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 *
 */

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

#include <linux/module.h>

#include "digital.h"

#define DIGITAL_PROTO_NFCA_RF_TECH \
	(NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | NFC_PROTO_NFC_DEP_MASK)

#define DIGITAL_PROTO_NFCB_RF_TECH	NFC_PROTO_ISO14443_B_MASK

#define DIGITAL_PROTO_NFCF_RF_TECH \
	(NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)

#define DIGITAL_PROTO_ISO15693_RF_TECH	NFC_PROTO_ISO15693_MASK

struct digital_cmd {
	struct list_head queue;

	u8 type;
	u8 pending;

	u16 timeout;
	struct sk_buff *req;
	struct sk_buff *resp;
	struct digital_tg_mdaa_params *mdaa_params;

	nfc_digital_cmd_complete_t cmd_cb;
	void *cb_context;
};

struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
				  unsigned int len)
{
	struct sk_buff *skb;

	skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
			GFP_KERNEL);
	if (skb)
		skb_reserve(skb, ddev->tx_headroom);

	return skb;
}

void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
			 u8 bitwise_inv, u8 msb_first)
{
	u16 crc;

	crc = crc_func(init, skb->data, skb->len);

	if (bitwise_inv)
		crc = ~crc;

	if (msb_first)
		crc = __fswab16(crc);

	*skb_put(skb, 1) = crc & 0xFF;
	*skb_put(skb, 1) = (crc >> 8) & 0xFF;
}

int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
			  u16 crc_init, u8 bitwise_inv, u8 msb_first)
{
	int rc;
	u16 crc;

	if (skb->len <= 2)
		return -EIO;

	crc = crc_func(crc_init, skb->data, skb->len - 2);

	if (bitwise_inv)
		crc = ~crc;

	if (msb_first)
		crc = __swab16(crc);

	rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
	     (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));

	if (rc)
		return -EIO;

	skb_trim(skb, skb->len - 2);

	return 0;
}

static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
{
	ddev->ops->switch_rf(ddev, on);
}

static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
{
	ddev->ops->abort_cmd(ddev);
}

static void digital_wq_cmd_complete(struct work_struct *work)
{
	struct digital_cmd *cmd;
	struct nfc_digital_dev *ddev = container_of(work,
						    struct nfc_digital_dev,
						    cmd_complete_work);

	mutex_lock(&ddev->cmd_lock);

	cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
				       queue);
	if (!cmd) {
		mutex_unlock(&ddev->cmd_lock);
		return;
	}

	list_del(&cmd->queue);

	mutex_unlock(&ddev->cmd_lock);

	if (!IS_ERR(cmd->resp))
		print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
				     cmd->resp->data, cmd->resp->len, false);

	cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);

	kfree(cmd->mdaa_params);
	kfree(cmd);

	schedule_work(&ddev->cmd_work);
}

static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
				      void *arg, struct sk_buff *resp)
{
	struct digital_cmd *cmd = arg;

	cmd->resp = resp;

	schedule_work(&ddev->cmd_complete_work);
}

static void digital_wq_cmd(struct work_struct *work)
{
	int rc;
	struct digital_cmd *cmd;
	struct digital_tg_mdaa_params *params;
	struct nfc_digital_dev *ddev = container_of(work,
						    struct nfc_digital_dev,
						    cmd_work);

	mutex_lock(&ddev->cmd_lock);

	cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
				       queue);
	if (!cmd || cmd->pending) {
		mutex_unlock(&ddev->cmd_lock);
		return;
	}

	mutex_unlock(&ddev->cmd_lock);

	if (cmd->req)
		print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
				     cmd->req->data, cmd->req->len, false);

	switch (cmd->type) {
	case DIGITAL_CMD_IN_SEND:
		rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
					    digital_send_cmd_complete, cmd);
		break;

	case DIGITAL_CMD_TG_SEND:
		rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
					    digital_send_cmd_complete, cmd);
		break;

	case DIGITAL_CMD_TG_LISTEN:
		rc = ddev->ops->tg_listen(ddev, cmd->timeout,
					  digital_send_cmd_complete, cmd);
		break;

	case DIGITAL_CMD_TG_LISTEN_MDAA:
		params = cmd->mdaa_params;

		rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
					       digital_send_cmd_complete, cmd);
		break;

	case DIGITAL_CMD_TG_LISTEN_MD:
		rc = ddev->ops->tg_listen_md(ddev, cmd->timeout,
					       digital_send_cmd_complete, cmd);
		break;

	default:
		pr_err("Unknown cmd type %d\n", cmd->type);
		return;
	}

	if (!rc)
		return;

	pr_err("in_send_command returned err %d\n", rc);

	mutex_lock(&ddev->cmd_lock);
	list_del(&cmd->queue);
	mutex_unlock(&ddev->cmd_lock);

	kfree_skb(cmd->req);
	kfree(cmd->mdaa_params);
	kfree(cmd);

	schedule_work(&ddev->cmd_work);
}

int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
		     struct sk_buff *skb, struct digital_tg_mdaa_params *params,
		     u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
		     void *cb_context)
{
	struct digital_cmd *cmd;

	cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL);
	if (!cmd)
		return -ENOMEM;

	cmd->type = cmd_type;
	cmd->timeout = timeout;
	cmd->req = skb;
	cmd->mdaa_params = params;
	cmd->cmd_cb = cmd_cb;
	cmd->cb_context = cb_context;
	INIT_LIST_HEAD(&cmd->queue);

	mutex_lock(&ddev->cmd_lock);
	list_add_tail(&cmd->queue, &ddev->cmd_queue);
	mutex_unlock(&ddev->cmd_lock);

	schedule_work(&ddev->cmd_work);

	return 0;
}

int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
{
	int rc;

	rc = ddev->ops->in_configure_hw(ddev, type, param);
	if (rc)
		pr_err("in_configure_hw failed: %d\n", rc);

	return rc;
}

int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
{
	int rc;

	rc = ddev->ops->tg_configure_hw(ddev, type, param);
	if (rc)
		pr_err("tg_configure_hw failed: %d\n", rc);

	return rc;
}

static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
{
	struct digital_tg_mdaa_params *params;
	int rc;

	params = kzalloc(sizeof(struct digital_tg_mdaa_params), GFP_KERNEL);
	if (!params)
		return -ENOMEM;

	params->sens_res = DIGITAL_SENS_RES_NFC_DEP;
	get_random_bytes(params->nfcid1, sizeof(params->nfcid1));
	params->sel_res = DIGITAL_SEL_RES_NFC_DEP;

	params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
	params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
	get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
	params->sc = DIGITAL_SENSF_FELICA_SC;

	rc = digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
			      500, digital_tg_recv_atr_req, NULL);
	if (rc)
		kfree(params);

	return rc;
}

static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech)
{
	return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500,
				digital_tg_recv_md_req, NULL);
}

int digital_target_found(struct nfc_digital_dev *ddev,
			 struct nfc_target *target, u8 protocol)
{
	int rc;
	u8 framing;
	u8 rf_tech;
	u8 poll_tech_count;
	int (*check_crc)(struct sk_buff *skb);
	void (*add_crc)(struct sk_buff *skb);

	rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;

	switch (protocol) {
	case NFC_PROTO_JEWEL:
		framing = NFC_DIGITAL_FRAMING_NFCA_T1T;
		check_crc = digital_skb_check_crc_b;
		add_crc = digital_skb_add_crc_b;
		break;

	case NFC_PROTO_MIFARE:
		framing = NFC_DIGITAL_FRAMING_NFCA_T2T;
		check_crc = digital_skb_check_crc_a;
		add_crc = digital_skb_add_crc_a;
		break;

	case NFC_PROTO_FELICA:
		framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
		check_crc = digital_skb_check_crc_f;
		add_crc = digital_skb_add_crc_f;
		break;

	case NFC_PROTO_NFC_DEP:
		if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
			framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
			check_crc = digital_skb_check_crc_a;
			add_crc = digital_skb_add_crc_a;
		} else {
			framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
			check_crc = digital_skb_check_crc_f;
			add_crc = digital_skb_add_crc_f;
		}
		break;

	case NFC_PROTO_ISO15693:
		framing = NFC_DIGITAL_FRAMING_ISO15693_T5T;
		check_crc = digital_skb_check_crc_b;
		add_crc = digital_skb_add_crc_b;
		break;

	case NFC_PROTO_ISO14443:
		framing = NFC_DIGITAL_FRAMING_NFCA_T4T;
		check_crc = digital_skb_check_crc_a;
		add_crc = digital_skb_add_crc_a;
		break;

	case NFC_PROTO_ISO14443_B:
		framing = NFC_DIGITAL_FRAMING_NFCB_T4T;
		check_crc = digital_skb_check_crc_b;
		add_crc = digital_skb_add_crc_b;
		break;

	default:
		pr_err("Invalid protocol %d\n", protocol);
		return -EINVAL;
	}

	pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);

	ddev->curr_rf_tech = rf_tech;

	if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
		ddev->skb_add_crc = digital_skb_add_crc_none;
		ddev->skb_check_crc = digital_skb_check_crc_none;
	} else {
		ddev->skb_add_crc = add_crc;
		ddev->skb_check_crc = check_crc;
	}

	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
	if (rc)
		return rc;

	target->supported_protocols = (1 << protocol);

	poll_tech_count = ddev->poll_tech_count;
	ddev->poll_tech_count = 0;

	rc = nfc_targets_found(ddev->nfc_dev, target, 1);
	if (rc) {
		ddev->poll_tech_count = poll_tech_count;
		return rc;
	}

	return 0;
}

void digital_poll_next_tech(struct nfc_digital_dev *ddev)
{
	u8 rand_mod;

	digital_switch_rf(ddev, 0);

	mutex_lock(&ddev->poll_lock);

	if (!ddev->poll_tech_count) {
		mutex_unlock(&ddev->poll_lock);
		return;
	}

	get_random_bytes(&rand_mod, sizeof(rand_mod));
	ddev->poll_tech_index = rand_mod % ddev->poll_tech_count;

	mutex_unlock(&ddev->poll_lock);

	schedule_work(&ddev->poll_work);
}

static void digital_wq_poll(struct work_struct *work)
{
	int rc;
	struct digital_poll_tech *poll_tech;
	struct nfc_digital_dev *ddev = container_of(work,
						    struct nfc_digital_dev,
						    poll_work);
	mutex_lock(&ddev->poll_lock);

	if (!ddev->poll_tech_count) {
		mutex_unlock(&ddev->poll_lock);
		return;
	}

	poll_tech = &ddev->poll_techs[ddev->poll_tech_index];

	mutex_unlock(&ddev->poll_lock);

	rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
	if (rc)
		digital_poll_next_tech(ddev);
}

static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
				  digital_poll_t poll_func)
{
	struct digital_poll_tech *poll_tech;

	if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
		return;

	poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];

	poll_tech->rf_tech = rf_tech;
	poll_tech->poll_func = poll_func;
}

/**
 * start_poll operation
 *
 * For every supported protocol, the corresponding polling function is added
 * to the table of polling technologies (ddev->poll_techs[]) using
 * digital_add_poll_tech().
 * When a polling function fails (by timeout or protocol error) the next one is
 * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
 */
static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
			      __u32 tm_protocols)
{
	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	u32 matching_im_protocols, matching_tm_protocols;

	pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
		 tm_protocols, ddev->protocols);

	matching_im_protocols = ddev->protocols & im_protocols;
	matching_tm_protocols = ddev->protocols & tm_protocols;

	if (!matching_im_protocols && !matching_tm_protocols) {
		pr_err("Unknown protocol\n");
		return -EINVAL;
	}

	if (ddev->poll_tech_count) {
		pr_err("Already polling\n");
		return -EBUSY;
	}

	if (ddev->curr_protocol) {
		pr_err("A target is already active\n");
		return -EBUSY;
	}

	ddev->poll_tech_count = 0;
	ddev->poll_tech_index = 0;

	if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
		digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
				      digital_in_send_sens_req);

	if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH)
		digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B,
				      digital_in_send_sensb_req);

	if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
		digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
				      digital_in_send_sensf_req);

		digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
				      digital_in_send_sensf_req);
	}

	if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
		digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
				      digital_in_send_iso15693_inv_req);

	if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
		if (ddev->ops->tg_listen_mdaa) {
			digital_add_poll_tech(ddev, 0,
					      digital_tg_listen_mdaa);
		} else if (ddev->ops->tg_listen_md) {
			digital_add_poll_tech(ddev, 0,
					      digital_tg_listen_md);
		} else {
			digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
					      digital_tg_listen_nfca);

			digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
					      digital_tg_listen_nfcf);

			digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
					      digital_tg_listen_nfcf);
		}
	}

	if (!ddev->poll_tech_count) {
		pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
		       matching_im_protocols, matching_tm_protocols);
		return -EINVAL;
	}

	schedule_work(&ddev->poll_work);

	return 0;
}

static void digital_stop_poll(struct nfc_dev *nfc_dev)
{
	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);

	mutex_lock(&ddev->poll_lock);

	if (!ddev->poll_tech_count) {
		pr_err("Polling operation was not running\n");
		mutex_unlock(&ddev->poll_lock);
		return;
	}

	ddev->poll_tech_count = 0;

	mutex_unlock(&ddev->poll_lock);

	cancel_work_sync(&ddev->poll_work);

	digital_abort_cmd(ddev);
}

static int digital_dev_up(struct nfc_dev *nfc_dev)
{
	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);

	digital_switch_rf(ddev, 1);

	return 0;
}

static int digital_dev_down(struct nfc_dev *nfc_dev)
{
	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);

	digital_switch_rf(ddev, 0);

	return 0;
}

static int digital_dep_link_up(struct nfc_dev *nfc_dev,
			       struct nfc_target *target,
			       __u8 comm_mode, __u8 *gb, size_t gb_len)
{
	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	int rc;

	rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);

	if (!rc)
		ddev->curr_protocol = NFC_PROTO_NFC_DEP;

	return rc;
}

static int digital_dep_link_down(struct nfc_dev *nfc_dev)
{
	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);

	ddev->curr_protocol = 0;

	return 0;
}

static int digital_activate_target(struct nfc_dev *nfc_dev,
				   struct nfc_target *target, __u32 protocol)
{
	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);

	if (ddev->poll_tech_count) {
		pr_err("Can't activate a target while polling\n");
		return -EBUSY;
	}

	if (ddev->curr_protocol) {
		pr_err("A target is already active\n");
		return -EBUSY;
	}

	ddev->curr_protocol = protocol;

	return 0;
}

static void digital_deactivate_target(struct nfc_dev *nfc_dev,
				      struct nfc_target *target,
				      u8 mode)
{
	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);

	if (!ddev->curr_protocol) {
		pr_err("No active target\n");
		return;
	}

	ddev->curr_protocol = 0;
}

static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb)
{
	struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);

	return digital_tg_send_dep_res(ddev, skb);
}

static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg,
				     struct sk_buff *resp)
{
	struct digital_data_exch *data_exch = arg;
	int rc;

	if (IS_ERR(resp)) {
		rc = PTR_ERR(resp);
		resp = NULL;
		goto done;
	}

	if (ddev->curr_protocol == NFC_PROTO_MIFARE) {
		rc = digital_in_recv_mifare_res(resp);
		/* crc check is done in digital_in_recv_mifare_res() */
		goto done;
	}

	if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
	    (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
		rc = digital_in_iso_dep_pull_sod(ddev, resp);
		if (rc)
			goto done;
	}

	rc = ddev->skb_check_crc(resp);

done:
	if (rc) {
		kfree_skb(resp);
		resp = NULL;
	}

	data_exch->cb(data_exch->cb_context, resp, rc);

	kfree(data_exch);
}

static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target,
			   struct sk_buff *skb, data_exchange_cb_t cb,
			   void *cb_context)
{
	struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
	struct digital_data_exch *data_exch;
	int rc;

	data_exch = kzalloc(sizeof(struct digital_data_exch), GFP_KERNEL);
	if (!data_exch) {
		pr_err("Failed to allocate data_exch struct\n");
		return -ENOMEM;
	}

	data_exch->cb = cb;
	data_exch->cb_context = cb_context;

	if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) {
		rc = digital_in_send_dep_req(ddev, target, skb, data_exch);
		goto exit;
	}

	if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
	    (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
		rc = digital_in_iso_dep_push_sod(ddev, skb);
		if (rc)
			goto exit;
	}

	ddev->skb_add_crc(skb);

	rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
				 data_exch);

exit:
	if (rc)
		kfree(data_exch);

	return rc;
}

static struct nfc_ops digital_nfc_ops = {
	.dev_up = digital_dev_up,
	.dev_down = digital_dev_down,
	.start_poll = digital_start_poll,
	.stop_poll = digital_stop_poll,
	.dep_link_up = digital_dep_link_up,
	.dep_link_down = digital_dep_link_down,
	.activate_target = digital_activate_target,
	.deactivate_target = digital_deactivate_target,
	.tm_send = digital_tg_send,
	.im_transceive = digital_in_send,
};

struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
					    __u32 supported_protocols,
					    __u32 driver_capabilities,
					    int tx_headroom, int tx_tailroom)
{
	struct nfc_digital_dev *ddev;

	if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen ||
	    !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd ||
	    !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech))
		return NULL;

	ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL);
	if (!ddev)
		return NULL;

	ddev->driver_capabilities = driver_capabilities;
	ddev->ops = ops;

	mutex_init(&ddev->cmd_lock);
	INIT_LIST_HEAD(&ddev->cmd_queue);

	INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
	INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);

	mutex_init(&ddev->poll_lock);
	INIT_WORK(&ddev->poll_work, digital_wq_poll);

	if (supported_protocols & NFC_PROTO_JEWEL_MASK)
		ddev->protocols |= NFC_PROTO_JEWEL_MASK;
	if (supported_protocols & NFC_PROTO_MIFARE_MASK)
		ddev->protocols |= NFC_PROTO_MIFARE_MASK;
	if (supported_protocols & NFC_PROTO_FELICA_MASK)
		ddev->protocols |= NFC_PROTO_FELICA_MASK;
	if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
		ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
	if (supported_protocols & NFC_PROTO_ISO15693_MASK)
		ddev->protocols |= NFC_PROTO_ISO15693_MASK;
	if (supported_protocols & NFC_PROTO_ISO14443_MASK)
		ddev->protocols |= NFC_PROTO_ISO14443_MASK;
	if (supported_protocols & NFC_PROTO_ISO14443_B_MASK)
		ddev->protocols |= NFC_PROTO_ISO14443_B_MASK;

	ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
	ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;

	ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
					    ddev->tx_headroom,
					    ddev->tx_tailroom);
	if (!ddev->nfc_dev) {
		pr_err("nfc_allocate_device failed\n");
		goto free_dev;
	}

	nfc_set_drvdata(ddev->nfc_dev, ddev);

	return ddev;

free_dev:
	kfree(ddev);

	return NULL;
}
EXPORT_SYMBOL(nfc_digital_allocate_device);

void nfc_digital_free_device(struct nfc_digital_dev *ddev)
{
	nfc_free_device(ddev->nfc_dev);
	kfree(ddev);
}
EXPORT_SYMBOL(nfc_digital_free_device);

int nfc_digital_register_device(struct nfc_digital_dev *ddev)
{
	return nfc_register_device(ddev->nfc_dev);
}
EXPORT_SYMBOL(nfc_digital_register_device);

void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
{
	struct digital_cmd *cmd, *n;

	nfc_unregister_device(ddev->nfc_dev);

	mutex_lock(&ddev->poll_lock);
	ddev->poll_tech_count = 0;
	mutex_unlock(&ddev->poll_lock);

	cancel_work_sync(&ddev->poll_work);
	cancel_work_sync(&ddev->cmd_work);
	cancel_work_sync(&ddev->cmd_complete_work);

	list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
		list_del(&cmd->queue);
		kfree(cmd->mdaa_params);
		kfree(cmd);
	}
}
EXPORT_SYMBOL(nfc_digital_unregister_device);

MODULE_LICENSE("GPL");