summaryrefslogtreecommitdiffstats
path: root/drivers/nfc/pn544/pn544.c
blob: 1d4b38c036fb97233e7ddaf25c39fbe83bb80e35 (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
/*
 * HCI based Driver for NXP PN544 NFC Chip
 *
 * Copyright (C) 2012  Intel Corporation. All rights reserved.
 *
 * 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 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.
 */

#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>

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

#include "pn544.h"

/* Timing restrictions (ms) */
#define PN544_HCI_RESETVEN_TIME		30

enum pn544_state {
	PN544_ST_COLD,
	PN544_ST_FW_READY,
	PN544_ST_READY,
};

#define FULL_VERSION_LEN 11

/* Proprietary commands */
#define PN544_WRITE		0x3f

/* Proprietary gates, events, commands and registers */

/* NFC_HCI_RF_READER_A_GATE additional registers and commands */
#define PN544_RF_READER_A_AUTO_ACTIVATION			0x10
#define PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION		0x12
#define PN544_MIFARE_CMD					0x21

/* Commands that apply to all RF readers */
#define PN544_RF_READER_CMD_PRESENCE_CHECK	0x30
#define PN544_RF_READER_CMD_ACTIVATE_NEXT	0x32

/* NFC_HCI_ID_MGMT_GATE additional registers */
#define PN544_ID_MGMT_FULL_VERSION_SW		0x10

#define PN544_RF_READER_ISO15693_GATE		0x12

#define PN544_RF_READER_F_GATE			0x14
#define PN544_FELICA_ID				0x04
#define PN544_FELICA_RAW			0x20

#define PN544_RF_READER_JEWEL_GATE		0x15
#define PN544_JEWEL_RAW_CMD			0x23

#define PN544_RF_READER_NFCIP1_INITIATOR_GATE	0x30
#define PN544_RF_READER_NFCIP1_TARGET_GATE	0x31

#define PN544_SYS_MGMT_GATE			0x90
#define PN544_SYS_MGMT_INFO_NOTIFICATION	0x02

#define PN544_POLLING_LOOP_MGMT_GATE		0x94
#define PN544_DEP_MODE				0x01
#define PN544_DEP_ATR_REQ			0x02
#define PN544_DEP_ATR_RES			0x03
#define PN544_DEP_MERGE				0x0D
#define PN544_PL_RDPHASES			0x06
#define PN544_PL_EMULATION			0x07
#define PN544_PL_NFCT_DEACTIVATED		0x09

#define PN544_SWP_MGMT_GATE			0xA0

#define PN544_NFC_WI_MGMT_GATE			0xA1

#define PN544_HCI_EVT_SND_DATA			0x01
#define PN544_HCI_EVT_ACTIVATED			0x02
#define PN544_HCI_EVT_DEACTIVATED		0x03
#define PN544_HCI_EVT_RCV_DATA			0x04
#define PN544_HCI_EVT_CONTINUE_MI		0x05

#define PN544_HCI_CMD_ATTREQUEST		0x12
#define PN544_HCI_CMD_CONTINUE_ACTIVATION	0x13

static struct nfc_hci_gate pn544_gates[] = {
	{NFC_HCI_ADMIN_GATE, NFC_HCI_INVALID_PIPE},
	{NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE},
	{NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_PIPE},
	{NFC_HCI_LINK_MGMT_GATE, NFC_HCI_INVALID_PIPE},
	{NFC_HCI_RF_READER_B_GATE, NFC_HCI_INVALID_PIPE},
	{NFC_HCI_RF_READER_A_GATE, NFC_HCI_INVALID_PIPE},
	{PN544_SYS_MGMT_GATE, NFC_HCI_INVALID_PIPE},
	{PN544_SWP_MGMT_GATE, NFC_HCI_INVALID_PIPE},
	{PN544_POLLING_LOOP_MGMT_GATE, NFC_HCI_INVALID_PIPE},
	{PN544_NFC_WI_MGMT_GATE, NFC_HCI_INVALID_PIPE},
	{PN544_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE},
	{PN544_RF_READER_JEWEL_GATE, NFC_HCI_INVALID_PIPE},
	{PN544_RF_READER_ISO15693_GATE, NFC_HCI_INVALID_PIPE},
	{PN544_RF_READER_NFCIP1_INITIATOR_GATE, NFC_HCI_INVALID_PIPE},
	{PN544_RF_READER_NFCIP1_TARGET_GATE, NFC_HCI_INVALID_PIPE}
};

/* Largest headroom needed for outgoing custom commands */
#define PN544_CMDS_HEADROOM	2

struct pn544_hci_info {
	struct nfc_phy_ops *phy_ops;
	void *phy_id;

	struct nfc_hci_dev *hdev;

	enum pn544_state state;

	struct mutex info_lock;

	int async_cb_type;
	data_exchange_cb_t async_cb;
	void *async_cb_context;
};

static int pn544_hci_open(struct nfc_hci_dev *hdev)
{
	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
	int r = 0;

	mutex_lock(&info->info_lock);

	if (info->state != PN544_ST_COLD) {
		r = -EBUSY;
		goto out;
	}

	r = info->phy_ops->enable(info->phy_id);

	if (r == 0)
		info->state = PN544_ST_READY;

out:
	mutex_unlock(&info->info_lock);
	return r;
}

static void pn544_hci_close(struct nfc_hci_dev *hdev)
{
	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);

	mutex_lock(&info->info_lock);

	if (info->state == PN544_ST_COLD)
		goto out;

	info->phy_ops->disable(info->phy_id);

	info->state = PN544_ST_COLD;

out:
	mutex_unlock(&info->info_lock);
}

static int pn544_hci_ready(struct nfc_hci_dev *hdev)
{
	struct sk_buff *skb;
	static struct hw_config {
		u8 adr[2];
		u8 value;
	} hw_config[] = {
		{{0x9f, 0x9a}, 0x00},

		{{0x98, 0x10}, 0xbc},

		{{0x9e, 0x71}, 0x00},

		{{0x98, 0x09}, 0x00},

		{{0x9e, 0xb4}, 0x00},

		{{0x9e, 0xd9}, 0xff},
		{{0x9e, 0xda}, 0xff},
		{{0x9e, 0xdb}, 0x23},
		{{0x9e, 0xdc}, 0x21},
		{{0x9e, 0xdd}, 0x22},
		{{0x9e, 0xde}, 0x24},

		{{0x9c, 0x01}, 0x08},

		{{0x9e, 0xaa}, 0x01},

		{{0x9b, 0xd1}, 0x0d},
		{{0x9b, 0xd2}, 0x24},
		{{0x9b, 0xd3}, 0x0a},
		{{0x9b, 0xd4}, 0x22},
		{{0x9b, 0xd5}, 0x08},
		{{0x9b, 0xd6}, 0x1e},
		{{0x9b, 0xdd}, 0x1c},

		{{0x9b, 0x84}, 0x13},
		{{0x99, 0x81}, 0x7f},
		{{0x99, 0x31}, 0x70},

		{{0x98, 0x00}, 0x3f},

		{{0x9f, 0x09}, 0x00},

		{{0x9f, 0x0a}, 0x05},

		{{0x9e, 0xd1}, 0xa1},
		{{0x99, 0x23}, 0x00},

		{{0x9e, 0x74}, 0x80},

		{{0x9f, 0x28}, 0x10},

		{{0x9f, 0x35}, 0x14},

		{{0x9f, 0x36}, 0x60},

		{{0x9c, 0x31}, 0x00},

		{{0x9c, 0x32}, 0xc8},

		{{0x9c, 0x19}, 0x40},

		{{0x9c, 0x1a}, 0x40},

		{{0x9c, 0x0c}, 0x00},

		{{0x9c, 0x0d}, 0x00},

		{{0x9c, 0x12}, 0x00},

		{{0x9c, 0x13}, 0x00},

		{{0x98, 0xa2}, 0x0e},

		{{0x98, 0x93}, 0x40},

		{{0x98, 0x7d}, 0x02},
		{{0x98, 0x7e}, 0x00},
		{{0x9f, 0xc8}, 0x01},
	};
	struct hw_config *p = hw_config;
	int count = ARRAY_SIZE(hw_config);
	struct sk_buff *res_skb;
	u8 param[4];
	int r;

	param[0] = 0;
	while (count--) {
		param[1] = p->adr[0];
		param[2] = p->adr[1];
		param[3] = p->value;

		r = nfc_hci_send_cmd(hdev, PN544_SYS_MGMT_GATE, PN544_WRITE,
				     param, 4, &res_skb);
		if (r < 0)
			return r;

		if (res_skb->len != 1) {
			kfree_skb(res_skb);
			return -EPROTO;
		}

		if (res_skb->data[0] != p->value) {
			kfree_skb(res_skb);
			return -EIO;
		}

		kfree_skb(res_skb);

		p++;
	}

	param[0] = NFC_HCI_UICC_HOST_ID;
	r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
			      NFC_HCI_ADMIN_WHITELIST, param, 1);
	if (r < 0)
		return r;

	param[0] = 0x3d;
	r = nfc_hci_set_param(hdev, PN544_SYS_MGMT_GATE,
			      PN544_SYS_MGMT_INFO_NOTIFICATION, param, 1);
	if (r < 0)
		return r;

	param[0] = 0x0;
	r = nfc_hci_set_param(hdev, NFC_HCI_RF_READER_A_GATE,
			      PN544_RF_READER_A_AUTO_ACTIVATION, param, 1);
	if (r < 0)
		return r;

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

	param[0] = 0x1;
	r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
			      PN544_PL_NFCT_DEACTIVATED, param, 1);
	if (r < 0)
		return r;

	param[0] = 0x0;
	r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
			      PN544_PL_RDPHASES, param, 1);
	if (r < 0)
		return r;

	r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
			      PN544_ID_MGMT_FULL_VERSION_SW, &skb);
	if (r < 0)
		return r;

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

	print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
		       DUMP_PREFIX_NONE, 16, 1,
		       skb->data, FULL_VERSION_LEN, false);

	kfree_skb(skb);

	return 0;
}

static int pn544_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);

	return info->phy_ops->write(info->phy_id, skb);
}

static int pn544_hci_start_poll(struct nfc_hci_dev *hdev,
				u32 im_protocols, u32 tm_protocols)
{
	u8 phases = 0;
	int r;
	u8 duration[2];
	u8 activated;
	u8 i_mode = 0x3f; /* Enable all supported modes */
	u8 t_mode = 0x0f;
	u8 t_merge = 0x01; /* Enable merge by default */

	pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n",
		__func__, im_protocols, tm_protocols);

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

	duration[0] = 0x18;
	duration[1] = 0x6a;
	r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
			      PN544_PL_EMULATION, duration, 2);
	if (r < 0)
		return r;

	activated = 0;
	r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
			      PN544_PL_NFCT_DEACTIVATED, &activated, 1);
	if (r < 0)
		return r;

	if (im_protocols & (NFC_PROTO_ISO14443_MASK | NFC_PROTO_MIFARE_MASK |
			 NFC_PROTO_JEWEL_MASK))
		phases |= 1;		/* Type A */
	if (im_protocols & NFC_PROTO_FELICA_MASK) {
		phases |= (1 << 2);	/* Type F 212 */
		phases |= (1 << 3);	/* Type F 424 */
	}

	phases |= (1 << 5);		/* NFC active */

	r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
			      PN544_PL_RDPHASES, &phases, 1);
	if (r < 0)
		return r;

	if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
		hdev->gb = nfc_get_local_general_bytes(hdev->ndev,
							&hdev->gb_len);
		pr_debug("generate local bytes %p", hdev->gb);
		if (hdev->gb == NULL || hdev->gb_len == 0) {
			im_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
			tm_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
		}
	}

	if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
		r = nfc_hci_send_event(hdev,
				PN544_RF_READER_NFCIP1_INITIATOR_GATE,
				NFC_HCI_EVT_END_OPERATION, NULL, 0);
		if (r < 0)
			return r;

		r = nfc_hci_set_param(hdev,
				PN544_RF_READER_NFCIP1_INITIATOR_GATE,
				PN544_DEP_MODE, &i_mode, 1);
		if (r < 0)
			return r;

		r = nfc_hci_set_param(hdev,
				PN544_RF_READER_NFCIP1_INITIATOR_GATE,
				PN544_DEP_ATR_REQ, hdev->gb, hdev->gb_len);
		if (r < 0)
			return r;

		r = nfc_hci_send_event(hdev,
				PN544_RF_READER_NFCIP1_INITIATOR_GATE,
				NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
		if (r < 0)
			nfc_hci_send_event(hdev,
					PN544_RF_READER_NFCIP1_INITIATOR_GATE,
					NFC_HCI_EVT_END_OPERATION, NULL, 0);
	}

	if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
		r = nfc_hci_set_param(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
				PN544_DEP_MODE, &t_mode, 1);
		if (r < 0)
			return r;

		r = nfc_hci_set_param(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
				PN544_DEP_ATR_RES, hdev->gb, hdev->gb_len);
		if (r < 0)
			return r;

		r = nfc_hci_set_param(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
				PN544_DEP_MERGE, &t_merge, 1);
		if (r < 0)
			return r;
	}

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

	return r;
}

static int pn544_hci_dep_link_up(struct nfc_hci_dev *hdev,
				struct nfc_target *target, u8 comm_mode,
				u8 *gb, size_t gb_len)
{
	struct sk_buff *rgb_skb = NULL;
	int r;

	r = nfc_hci_get_param(hdev, target->hci_reader_gate,
				PN544_DEP_ATR_RES, &rgb_skb);
	if (r < 0)
		return r;

	if (rgb_skb->len == 0 || rgb_skb->len > NFC_GB_MAXSIZE) {
		r = -EPROTO;
		goto exit;
	}
	print_hex_dump(KERN_DEBUG, "remote gb: ", DUMP_PREFIX_OFFSET,
			16, 1, rgb_skb->data, rgb_skb->len, true);

	r = nfc_set_remote_general_bytes(hdev->ndev, rgb_skb->data,
						rgb_skb->len);

	if (r == 0)
		r = nfc_dep_link_is_up(hdev->ndev, target->idx, comm_mode,
					NFC_RF_INITIATOR);
exit:
	kfree_skb(rgb_skb);
	return r;
}

static int pn544_hci_dep_link_down(struct nfc_hci_dev *hdev)
{

	return nfc_hci_send_event(hdev, PN544_RF_READER_NFCIP1_INITIATOR_GATE,
					NFC_HCI_EVT_END_OPERATION, NULL, 0);
}

static int pn544_hci_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
				      struct nfc_target *target)
{
	switch (gate) {
	case PN544_RF_READER_F_GATE:
		target->supported_protocols = NFC_PROTO_FELICA_MASK;
		break;
	case PN544_RF_READER_JEWEL_GATE:
		target->supported_protocols = NFC_PROTO_JEWEL_MASK;
		target->sens_res = 0x0c00;
		break;
	case PN544_RF_READER_NFCIP1_INITIATOR_GATE:
		target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
		break;
	default:
		return -EPROTO;
	}

	return 0;
}

static int pn544_hci_complete_target_discovered(struct nfc_hci_dev *hdev,
						u8 gate,
						struct nfc_target *target)
{
	struct sk_buff *uid_skb;
	int r = 0;

	if (gate == PN544_RF_READER_NFCIP1_INITIATOR_GATE)
		return r;

	if (target->supported_protocols & NFC_PROTO_NFC_DEP_MASK) {
		r = nfc_hci_send_cmd(hdev,
			PN544_RF_READER_NFCIP1_INITIATOR_GATE,
			PN544_HCI_CMD_CONTINUE_ACTIVATION, NULL, 0, NULL);
		if (r < 0)
			return r;

		target->hci_reader_gate = PN544_RF_READER_NFCIP1_INITIATOR_GATE;
	} else if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
		if (target->nfcid1_len != 4 && target->nfcid1_len != 7 &&
		    target->nfcid1_len != 10)
			return -EPROTO;

		r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
				     PN544_RF_READER_CMD_ACTIVATE_NEXT,
				     target->nfcid1, target->nfcid1_len, NULL);
	} else if (target->supported_protocols & NFC_PROTO_FELICA_MASK) {
		r = nfc_hci_get_param(hdev, PN544_RF_READER_F_GATE,
				      PN544_FELICA_ID, &uid_skb);
		if (r < 0)
			return r;

		if (uid_skb->len != 8) {
			kfree_skb(uid_skb);
			return -EPROTO;
		}

		/* Type F NFC-DEP IDm has prefix 0x01FE */
		if ((uid_skb->data[0] == 0x01) && (uid_skb->data[1] == 0xfe)) {
			kfree_skb(uid_skb);
			r = nfc_hci_send_cmd(hdev,
					PN544_RF_READER_NFCIP1_INITIATOR_GATE,
					PN544_HCI_CMD_CONTINUE_ACTIVATION,
					NULL, 0, NULL);
			if (r < 0)
				return r;

			target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
			target->hci_reader_gate =
				PN544_RF_READER_NFCIP1_INITIATOR_GATE;
		} else {
			r = nfc_hci_send_cmd(hdev, PN544_RF_READER_F_GATE,
					     PN544_RF_READER_CMD_ACTIVATE_NEXT,
					     uid_skb->data, uid_skb->len, NULL);
			kfree_skb(uid_skb);
		}
	} else if (target->supported_protocols & NFC_PROTO_ISO14443_MASK) {
		/*
		 * TODO: maybe other ISO 14443 require some kind of continue
		 * activation, but for now we've seen only this one below.
		 */
		if (target->sens_res == 0x4403)	/* Type 4 Mifare DESFire */
			r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
			      PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION,
			      NULL, 0, NULL);
	}

	return r;
}

#define PN544_CB_TYPE_READER_F 1

static void pn544_hci_data_exchange_cb(void *context, struct sk_buff *skb,
				       int err)
{
	struct pn544_hci_info *info = context;

	switch (info->async_cb_type) {
	case PN544_CB_TYPE_READER_F:
		if (err == 0)
			skb_pull(skb, 1);
		info->async_cb(info->async_cb_context, skb, err);
		break;
	default:
		if (err == 0)
			kfree_skb(skb);
		break;
	}
}

#define MIFARE_CMD_AUTH_KEY_A	0x60
#define MIFARE_CMD_AUTH_KEY_B	0x61
#define MIFARE_CMD_HEADER	2
#define MIFARE_UID_LEN		4
#define MIFARE_KEY_LEN		6
#define MIFARE_CMD_LEN		12
/*
 * Returns:
 * <= 0: driver handled the data exchange
 *    1: driver doesn't especially handle, please do standard processing
 */
static int pn544_hci_im_transceive(struct nfc_hci_dev *hdev,
				   struct nfc_target *target,
				   struct sk_buff *skb, data_exchange_cb_t cb,
				   void *cb_context)
{
	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);

	pr_info(DRIVER_DESC ": %s for gate=%d\n", __func__,
		target->hci_reader_gate);

	switch (target->hci_reader_gate) {
	case NFC_HCI_RF_READER_A_GATE:
		if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
			/*
			 * It seems that pn544 is inverting key and UID for
			 * MIFARE authentication commands.
			 */
			if (skb->len == MIFARE_CMD_LEN &&
			    (skb->data[0] == MIFARE_CMD_AUTH_KEY_A ||
			     skb->data[0] == MIFARE_CMD_AUTH_KEY_B)) {
				u8 uid[MIFARE_UID_LEN];
				u8 *data = skb->data + MIFARE_CMD_HEADER;

				memcpy(uid, data + MIFARE_KEY_LEN,
				       MIFARE_UID_LEN);
				memmove(data + MIFARE_UID_LEN, data,
					MIFARE_KEY_LEN);
				memcpy(data, uid, MIFARE_UID_LEN);
			}

			return nfc_hci_send_cmd_async(hdev,
						      target->hci_reader_gate,
						      PN544_MIFARE_CMD,
						      skb->data, skb->len,
						      cb, cb_context);
		} else
			return 1;
	case PN544_RF_READER_F_GATE:
		*skb_push(skb, 1) = 0;
		*skb_push(skb, 1) = 0;

		info->async_cb_type = PN544_CB_TYPE_READER_F;
		info->async_cb = cb;
		info->async_cb_context = cb_context;

		return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
					      PN544_FELICA_RAW, skb->data,
					      skb->len,
					      pn544_hci_data_exchange_cb, info);
	case PN544_RF_READER_JEWEL_GATE:
		return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
					      PN544_JEWEL_RAW_CMD, skb->data,
					      skb->len, cb, cb_context);
	case PN544_RF_READER_NFCIP1_INITIATOR_GATE:
		*skb_push(skb, 1) = 0;

		return nfc_hci_send_event(hdev, target->hci_reader_gate,
					PN544_HCI_EVT_SND_DATA, skb->data,
					skb->len);
	default:
		return 1;
	}
}

static int pn544_hci_tm_send(struct nfc_hci_dev *hdev, struct sk_buff *skb)
{
	int r;

	/* Set default false for multiple information chaining */
	*skb_push(skb, 1) = 0;

	r = nfc_hci_send_event(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
			       PN544_HCI_EVT_SND_DATA, skb->data, skb->len);

	kfree_skb(skb);

	return r;
}

static int pn544_hci_check_presence(struct nfc_hci_dev *hdev,
				   struct nfc_target *target)
{
	pr_debug("supported protocol %d", target->supported_protocols);
	if (target->supported_protocols & (NFC_PROTO_ISO14443_MASK |
					NFC_PROTO_ISO14443_B_MASK)) {
		return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
					PN544_RF_READER_CMD_PRESENCE_CHECK,
					NULL, 0, NULL);
	} else if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
		if (target->nfcid1_len != 4 && target->nfcid1_len != 7 &&
		    target->nfcid1_len != 10)
			return -EOPNOTSUPP;

		 return nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
				     PN544_RF_READER_CMD_ACTIVATE_NEXT,
				     target->nfcid1, target->nfcid1_len, NULL);
	} else if (target->supported_protocols & (NFC_PROTO_JEWEL_MASK |
						NFC_PROTO_FELICA_MASK)) {
		return -EOPNOTSUPP;
	} else if (target->supported_protocols & NFC_PROTO_NFC_DEP_MASK) {
		return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
					PN544_HCI_CMD_ATTREQUEST,
					NULL, 0, NULL);
	}

	return 0;
}

/*
 * Returns:
 * <= 0: driver handled the event, skb consumed
 *    1: driver does not handle the event, please do standard processing
 */
static int pn544_hci_event_received(struct nfc_hci_dev *hdev, u8 gate, u8 event,
				    struct sk_buff *skb)
{
	struct sk_buff *rgb_skb = NULL;
	int r;

	pr_debug("hci event %d", event);
	switch (event) {
	case PN544_HCI_EVT_ACTIVATED:
		if (gate == PN544_RF_READER_NFCIP1_INITIATOR_GATE) {
			r = nfc_hci_target_discovered(hdev, gate);
		} else if (gate == PN544_RF_READER_NFCIP1_TARGET_GATE) {
			r = nfc_hci_get_param(hdev, gate, PN544_DEP_ATR_REQ,
					      &rgb_skb);
			if (r < 0)
				goto exit;

			r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
					     NFC_COMM_PASSIVE, rgb_skb->data,
					     rgb_skb->len);

			kfree_skb(rgb_skb);
		} else {
			r = -EINVAL;
		}
		break;
	case PN544_HCI_EVT_DEACTIVATED:
		r = nfc_hci_send_event(hdev, gate, NFC_HCI_EVT_END_OPERATION,
				       NULL, 0);
		break;
	case PN544_HCI_EVT_RCV_DATA:
		if (skb->len < 2) {
			r = -EPROTO;
			goto exit;
		}

		if (skb->data[0] != 0) {
			pr_debug("data0 %d", skb->data[0]);
			r = -EPROTO;
			goto exit;
		}

		skb_pull(skb, 2);
		return nfc_tm_data_received(hdev->ndev, skb);
	default:
		return 1;
	}

exit:
	kfree_skb(skb);

	return r;
}

static struct nfc_hci_ops pn544_hci_ops = {
	.open = pn544_hci_open,
	.close = pn544_hci_close,
	.hci_ready = pn544_hci_ready,
	.xmit = pn544_hci_xmit,
	.start_poll = pn544_hci_start_poll,
	.dep_link_up = pn544_hci_dep_link_up,
	.dep_link_down = pn544_hci_dep_link_down,
	.target_from_gate = pn544_hci_target_from_gate,
	.complete_target_discovered = pn544_hci_complete_target_discovered,
	.im_transceive = pn544_hci_im_transceive,
	.tm_send = pn544_hci_tm_send,
	.check_presence = pn544_hci_check_presence,
	.event_received = pn544_hci_event_received,
};

int pn544_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops, char *llc_name,
		    int phy_headroom, int phy_tailroom, int phy_payload,
		    struct nfc_hci_dev **hdev)
{
	struct pn544_hci_info *info;
	u32 protocols;
	struct nfc_hci_init_data init_data;
	int r;

	info = kzalloc(sizeof(struct pn544_hci_info), GFP_KERNEL);
	if (!info) {
		pr_err("Cannot allocate memory for pn544_hci_info.\n");
		r = -ENOMEM;
		goto err_info_alloc;
	}

	info->phy_ops = phy_ops;
	info->phy_id = phy_id;
	info->state = PN544_ST_COLD;
	mutex_init(&info->info_lock);

	init_data.gate_count = ARRAY_SIZE(pn544_gates);

	memcpy(init_data.gates, pn544_gates, sizeof(pn544_gates));

	/*
	 * TODO: Session id must include the driver name + some bus addr
	 * persistent info to discriminate 2 identical chips
	 */
	strcpy(init_data.session_id, "ID544HCI");

	protocols = NFC_PROTO_JEWEL_MASK |
		    NFC_PROTO_MIFARE_MASK |
		    NFC_PROTO_FELICA_MASK |
		    NFC_PROTO_ISO14443_MASK |
		    NFC_PROTO_ISO14443_B_MASK |
		    NFC_PROTO_NFC_DEP_MASK;

	info->hdev = nfc_hci_allocate_device(&pn544_hci_ops, &init_data, 0,
					     protocols, llc_name,
					     phy_headroom + PN544_CMDS_HEADROOM,
					     phy_tailroom, phy_payload);
	if (!info->hdev) {
		pr_err("Cannot allocate nfc hdev.\n");
		r = -ENOMEM;
		goto err_alloc_hdev;
	}

	nfc_hci_set_clientdata(info->hdev, info);

	r = nfc_hci_register_device(info->hdev);
	if (r)
		goto err_regdev;

	*hdev = info->hdev;

	return 0;

err_regdev:
	nfc_hci_free_device(info->hdev);

err_alloc_hdev:
	kfree(info);

err_info_alloc:
	return r;
}
EXPORT_SYMBOL(pn544_hci_probe);

void pn544_hci_remove(struct nfc_hci_dev *hdev)
{
	struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);

	nfc_hci_unregister_device(hdev);
	nfc_hci_free_device(hdev);
	kfree(info);
}
EXPORT_SYMBOL(pn544_hci_remove);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRIVER_DESC);