forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
core.c
1248 lines (974 loc) · 24.8 KB
/
core.c
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
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright (C) 2011 Instituto Nokia de Tecnologia
*
* Authors:
* Lauro Ramos Venancio <[email protected]>
* Aloisio Almeida Jr <[email protected]>
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/rfkill.h>
#include <linux/nfc.h>
#include <net/genetlink.h>
#include "nfc.h"
#define VERSION "0.1"
#define NFC_CHECK_PRES_FREQ_MS 2000
int nfc_devlist_generation;
DEFINE_MUTEX(nfc_devlist_mutex);
/* NFC device ID bitmap */
static DEFINE_IDA(nfc_index_ida);
int nfc_fw_download(struct nfc_dev *dev, const char *firmware_name)
{
int rc = 0;
pr_debug("%s do firmware %s\n", dev_name(&dev->dev), firmware_name);
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->dev_up) {
rc = -EBUSY;
goto error;
}
if (!dev->ops->fw_download) {
rc = -EOPNOTSUPP;
goto error;
}
dev->fw_download_in_progress = true;
rc = dev->ops->fw_download(dev, firmware_name);
if (rc)
dev->fw_download_in_progress = false;
error:
device_unlock(&dev->dev);
return rc;
}
/**
* nfc_fw_download_done - inform that a firmware download was completed
*
* @dev: The nfc device to which firmware was downloaded
* @firmware_name: The firmware filename
* @result: The positive value of a standard errno value
*/
int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
u32 result)
{
dev->fw_download_in_progress = false;
return nfc_genl_fw_download_done(dev, firmware_name, result);
}
EXPORT_SYMBOL(nfc_fw_download_done);
/**
* nfc_dev_up - turn on the NFC device
*
* @dev: The nfc device to be turned on
*
* The device remains up until the nfc_dev_down function is called.
*/
int nfc_dev_up(struct nfc_dev *dev)
{
int rc = 0;
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
device_lock(&dev->dev);
if (dev->rfkill && rfkill_blocked(dev->rfkill)) {
rc = -ERFKILL;
goto error;
}
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->fw_download_in_progress) {
rc = -EBUSY;
goto error;
}
if (dev->dev_up) {
rc = -EALREADY;
goto error;
}
if (dev->ops->dev_up)
rc = dev->ops->dev_up(dev);
if (!rc)
dev->dev_up = true;
/* We have to enable the device before discovering SEs */
if (dev->ops->discover_se && dev->ops->discover_se(dev))
pr_err("SE discovery failed\n");
error:
device_unlock(&dev->dev);
return rc;
}
/**
* nfc_dev_down - turn off the NFC device
*
* @dev: The nfc device to be turned off
*/
int nfc_dev_down(struct nfc_dev *dev)
{
int rc = 0;
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (!dev->dev_up) {
rc = -EALREADY;
goto error;
}
if (dev->polling || dev->active_target) {
rc = -EBUSY;
goto error;
}
if (dev->ops->dev_down)
dev->ops->dev_down(dev);
dev->dev_up = false;
error:
device_unlock(&dev->dev);
return rc;
}
static int nfc_rfkill_set_block(void *data, bool blocked)
{
struct nfc_dev *dev = data;
pr_debug("%s blocked %d", dev_name(&dev->dev), blocked);
if (!blocked)
return 0;
nfc_dev_down(dev);
return 0;
}
static const struct rfkill_ops nfc_rfkill_ops = {
.set_block = nfc_rfkill_set_block,
};
/**
* nfc_start_poll - start polling for nfc targets
*
* @dev: The nfc device that must start polling
* @protocols: bitset of nfc protocols that must be used for polling
*
* The device remains polling for targets until a target is found or
* the nfc_stop_poll function is called.
*/
int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols)
{
int rc;
pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n",
dev_name(&dev->dev), im_protocols, tm_protocols);
if (!im_protocols && !tm_protocols)
return -EINVAL;
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (!dev->dev_up) {
rc = -ENODEV;
goto error;
}
if (dev->polling) {
rc = -EBUSY;
goto error;
}
rc = dev->ops->start_poll(dev, im_protocols, tm_protocols);
if (!rc) {
dev->polling = true;
dev->rf_mode = NFC_RF_NONE;
}
error:
device_unlock(&dev->dev);
return rc;
}
/**
* nfc_stop_poll - stop polling for nfc targets
*
* @dev: The nfc device that must stop polling
*/
int nfc_stop_poll(struct nfc_dev *dev)
{
int rc = 0;
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (!dev->polling) {
rc = -EINVAL;
goto error;
}
dev->ops->stop_poll(dev);
dev->polling = false;
dev->rf_mode = NFC_RF_NONE;
error:
device_unlock(&dev->dev);
return rc;
}
static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx)
{
int i;
for (i = 0; i < dev->n_targets; i++) {
if (dev->targets[i].idx == target_idx)
return &dev->targets[i];
}
return NULL;
}
int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode)
{
int rc = 0;
u8 *gb;
size_t gb_len;
struct nfc_target *target;
pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode);
if (!dev->ops->dep_link_up)
return -EOPNOTSUPP;
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->dep_link_up == true) {
rc = -EALREADY;
goto error;
}
gb = nfc_llcp_general_bytes(dev, &gb_len);
if (gb_len > NFC_MAX_GT_LEN) {
rc = -EINVAL;
goto error;
}
target = nfc_find_target(dev, target_index);
if (target == NULL) {
rc = -ENOTCONN;
goto error;
}
rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len);
if (!rc) {
dev->active_target = target;
dev->rf_mode = NFC_RF_INITIATOR;
}
error:
device_unlock(&dev->dev);
return rc;
}
int nfc_dep_link_down(struct nfc_dev *dev)
{
int rc = 0;
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
if (!dev->ops->dep_link_down)
return -EOPNOTSUPP;
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->dep_link_up == false) {
rc = -EALREADY;
goto error;
}
rc = dev->ops->dep_link_down(dev);
if (!rc) {
dev->dep_link_up = false;
dev->active_target = NULL;
dev->rf_mode = NFC_RF_NONE;
nfc_llcp_mac_is_down(dev);
nfc_genl_dep_link_down_event(dev);
}
error:
device_unlock(&dev->dev);
return rc;
}
int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
u8 comm_mode, u8 rf_mode)
{
dev->dep_link_up = true;
if (!dev->active_target && rf_mode == NFC_RF_INITIATOR) {
struct nfc_target *target;
target = nfc_find_target(dev, target_idx);
if (target == NULL)
return -ENOTCONN;
dev->active_target = target;
}
dev->polling = false;
dev->rf_mode = rf_mode;
nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode);
return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode);
}
EXPORT_SYMBOL(nfc_dep_link_is_up);
/**
* nfc_activate_target - prepare the target for data exchange
*
* @dev: The nfc device that found the target
* @target_idx: index of the target that must be activated
* @protocol: nfc protocol that will be used for data exchange
*/
int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
{
int rc;
struct nfc_target *target;
pr_debug("dev_name=%s target_idx=%u protocol=%u\n",
dev_name(&dev->dev), target_idx, protocol);
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->active_target) {
rc = -EBUSY;
goto error;
}
target = nfc_find_target(dev, target_idx);
if (target == NULL) {
rc = -ENOTCONN;
goto error;
}
rc = dev->ops->activate_target(dev, target, protocol);
if (!rc) {
dev->active_target = target;
dev->rf_mode = NFC_RF_INITIATOR;
if (dev->ops->check_presence && !dev->shutting_down)
mod_timer(&dev->check_pres_timer, jiffies +
msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
}
error:
device_unlock(&dev->dev);
return rc;
}
/**
* nfc_deactivate_target - deactivate a nfc target
*
* @dev: The nfc device that found the target
* @target_idx: index of the target that must be deactivated
*/
int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx, u8 mode)
{
int rc = 0;
pr_debug("dev_name=%s target_idx=%u\n",
dev_name(&dev->dev), target_idx);
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->active_target == NULL) {
rc = -ENOTCONN;
goto error;
}
if (dev->active_target->idx != target_idx) {
rc = -ENOTCONN;
goto error;
}
if (dev->ops->check_presence)
del_timer_sync(&dev->check_pres_timer);
dev->ops->deactivate_target(dev, dev->active_target, mode);
dev->active_target = NULL;
error:
device_unlock(&dev->dev);
return rc;
}
/**
* nfc_data_exchange - transceive data
*
* @dev: The nfc device that found the target
* @target_idx: index of the target
* @skb: data to be sent
* @cb: callback called when the response is received
* @cb_context: parameter for the callback function
*
* The user must wait for the callback before calling this function again.
*/
int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb,
data_exchange_cb_t cb, void *cb_context)
{
int rc;
pr_debug("dev_name=%s target_idx=%u skb->len=%u\n",
dev_name(&dev->dev), target_idx, skb->len);
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
kfree_skb(skb);
goto error;
}
if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) {
if (dev->active_target->idx != target_idx) {
rc = -EADDRNOTAVAIL;
kfree_skb(skb);
goto error;
}
if (dev->ops->check_presence)
del_timer_sync(&dev->check_pres_timer);
rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb,
cb_context);
if (!rc && dev->ops->check_presence && !dev->shutting_down)
mod_timer(&dev->check_pres_timer, jiffies +
msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
} else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) {
rc = dev->ops->tm_send(dev, skb);
} else {
rc = -ENOTCONN;
kfree_skb(skb);
goto error;
}
error:
device_unlock(&dev->dev);
return rc;
}
struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx)
{
struct nfc_se *se;
list_for_each_entry(se, &dev->secure_elements, list)
if (se->idx == se_idx)
return se;
return NULL;
}
EXPORT_SYMBOL(nfc_find_se);
int nfc_enable_se(struct nfc_dev *dev, u32 se_idx)
{
struct nfc_se *se;
int rc;
pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (!dev->dev_up) {
rc = -ENODEV;
goto error;
}
if (dev->polling) {
rc = -EBUSY;
goto error;
}
if (!dev->ops->enable_se || !dev->ops->disable_se) {
rc = -EOPNOTSUPP;
goto error;
}
se = nfc_find_se(dev, se_idx);
if (!se) {
rc = -EINVAL;
goto error;
}
if (se->state == NFC_SE_ENABLED) {
rc = -EALREADY;
goto error;
}
rc = dev->ops->enable_se(dev, se_idx);
if (rc >= 0)
se->state = NFC_SE_ENABLED;
error:
device_unlock(&dev->dev);
return rc;
}
int nfc_disable_se(struct nfc_dev *dev, u32 se_idx)
{
struct nfc_se *se;
int rc;
pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (!dev->dev_up) {
rc = -ENODEV;
goto error;
}
if (!dev->ops->enable_se || !dev->ops->disable_se) {
rc = -EOPNOTSUPP;
goto error;
}
se = nfc_find_se(dev, se_idx);
if (!se) {
rc = -EINVAL;
goto error;
}
if (se->state == NFC_SE_DISABLED) {
rc = -EALREADY;
goto error;
}
rc = dev->ops->disable_se(dev, se_idx);
if (rc >= 0)
se->state = NFC_SE_DISABLED;
error:
device_unlock(&dev->dev);
return rc;
}
int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
{
pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len);
return nfc_llcp_set_remote_gb(dev, gb, gb_len);
}
EXPORT_SYMBOL(nfc_set_remote_general_bytes);
u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
{
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
return nfc_llcp_general_bytes(dev, gb_len);
}
EXPORT_SYMBOL(nfc_get_local_general_bytes);
int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb)
{
/* Only LLCP target mode for now */
if (dev->dep_link_up == false) {
kfree_skb(skb);
return -ENOLINK;
}
return nfc_llcp_data_received(dev, skb);
}
EXPORT_SYMBOL(nfc_tm_data_received);
int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
u8 *gb, size_t gb_len)
{
int rc;
device_lock(&dev->dev);
dev->polling = false;
if (gb != NULL) {
rc = nfc_set_remote_general_bytes(dev, gb, gb_len);
if (rc < 0)
goto out;
}
dev->rf_mode = NFC_RF_TARGET;
if (protocol == NFC_PROTO_NFC_DEP_MASK)
nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET);
rc = nfc_genl_tm_activated(dev, protocol);
out:
device_unlock(&dev->dev);
return rc;
}
EXPORT_SYMBOL(nfc_tm_activated);
int nfc_tm_deactivated(struct nfc_dev *dev)
{
dev->dep_link_up = false;
dev->rf_mode = NFC_RF_NONE;
return nfc_genl_tm_deactivated(dev);
}
EXPORT_SYMBOL(nfc_tm_deactivated);
/**
* nfc_alloc_send_skb - allocate a skb for data exchange responses
*
* @size: size to allocate
* @gfp: gfp flags
*/
struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
unsigned int flags, unsigned int size,
unsigned int *err)
{
struct sk_buff *skb;
unsigned int total_size;
total_size = size +
dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err);
if (skb)
skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
return skb;
}
/**
* nfc_alloc_recv_skb - allocate a skb for data exchange responses
*
* @size: size to allocate
* @gfp: gfp flags
*/
struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp)
{
struct sk_buff *skb;
unsigned int total_size;
total_size = size + 1;
skb = alloc_skb(total_size, gfp);
if (skb)
skb_reserve(skb, 1);
return skb;
}
EXPORT_SYMBOL(nfc_alloc_recv_skb);
/**
* nfc_targets_found - inform that targets were found
*
* @dev: The nfc device that found the targets
* @targets: array of nfc targets found
* @ntargets: targets array size
*
* The device driver must call this function when one or many nfc targets
* are found. After calling this function, the device driver must stop
* polling for targets.
* NOTE: This function can be called with targets=NULL and n_targets=0 to
* notify a driver error, meaning that the polling operation cannot complete.
* IMPORTANT: this function must not be called from an atomic context.
* In addition, it must also not be called from a context that would prevent
* the NFC Core to call other nfc ops entry point concurrently.
*/
int nfc_targets_found(struct nfc_dev *dev,
struct nfc_target *targets, int n_targets)
{
int i;
pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets);
for (i = 0; i < n_targets; i++)
targets[i].idx = dev->target_next_idx++;
device_lock(&dev->dev);
if (dev->polling == false) {
device_unlock(&dev->dev);
return 0;
}
dev->polling = false;
dev->targets_generation++;
kfree(dev->targets);
dev->targets = NULL;
if (targets) {
dev->targets = kmemdup(targets,
n_targets * sizeof(struct nfc_target),
GFP_ATOMIC);
if (!dev->targets) {
dev->n_targets = 0;
device_unlock(&dev->dev);
return -ENOMEM;
}
}
dev->n_targets = n_targets;
device_unlock(&dev->dev);
nfc_genl_targets_found(dev);
return 0;
}
EXPORT_SYMBOL(nfc_targets_found);
/**
* nfc_target_lost - inform that an activated target went out of field
*
* @dev: The nfc device that had the activated target in field
* @target_idx: the nfc index of the target
*
* The device driver must call this function when the activated target
* goes out of the field.
* IMPORTANT: this function must not be called from an atomic context.
* In addition, it must also not be called from a context that would prevent
* the NFC Core to call other nfc ops entry point concurrently.
*/
int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
{
struct nfc_target *tg;
int i;
pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx);
device_lock(&dev->dev);
for (i = 0; i < dev->n_targets; i++) {
tg = &dev->targets[i];
if (tg->idx == target_idx)
break;
}
if (i == dev->n_targets) {
device_unlock(&dev->dev);
return -EINVAL;
}
dev->targets_generation++;
dev->n_targets--;
dev->active_target = NULL;
if (dev->n_targets) {
memcpy(&dev->targets[i], &dev->targets[i + 1],
(dev->n_targets - i) * sizeof(struct nfc_target));
} else {
kfree(dev->targets);
dev->targets = NULL;
}
device_unlock(&dev->dev);
nfc_genl_target_lost(dev, target_idx);
return 0;
}
EXPORT_SYMBOL(nfc_target_lost);
inline void nfc_driver_failure(struct nfc_dev *dev, int err)
{
nfc_targets_found(dev, NULL, 0);
}
EXPORT_SYMBOL(nfc_driver_failure);
int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type)
{
struct nfc_se *se;
int rc;
pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
se = nfc_find_se(dev, se_idx);
if (se)
return -EALREADY;
se = kzalloc(sizeof(struct nfc_se), GFP_KERNEL);
if (!se)
return -ENOMEM;
se->idx = se_idx;
se->type = type;
se->state = NFC_SE_DISABLED;
INIT_LIST_HEAD(&se->list);
list_add(&se->list, &dev->secure_elements);
rc = nfc_genl_se_added(dev, se_idx, type);
if (rc < 0) {
list_del(&se->list);
kfree(se);
return rc;
}
return 0;
}
EXPORT_SYMBOL(nfc_add_se);
int nfc_remove_se(struct nfc_dev *dev, u32 se_idx)
{
struct nfc_se *se, *n;
int rc;
pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
list_for_each_entry_safe(se, n, &dev->secure_elements, list)
if (se->idx == se_idx) {
rc = nfc_genl_se_removed(dev, se_idx);
if (rc < 0)
return rc;
list_del(&se->list);
kfree(se);
return 0;
}
return -EINVAL;
}
EXPORT_SYMBOL(nfc_remove_se);
int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,
struct nfc_evt_transaction *evt_transaction)
{
int rc;
pr_debug("transaction: %x\n", se_idx);
device_lock(&dev->dev);
if (!evt_transaction) {
rc = -EPROTO;
goto out;
}
rc = nfc_genl_se_transaction(dev, se_idx, evt_transaction);
out:
device_unlock(&dev->dev);
return rc;
}
EXPORT_SYMBOL(nfc_se_transaction);
int nfc_se_connectivity(struct nfc_dev *dev, u8 se_idx)
{
int rc;
pr_debug("connectivity: %x\n", se_idx);
device_lock(&dev->dev);
rc = nfc_genl_se_connectivity(dev, se_idx);
device_unlock(&dev->dev);
return rc;
}
EXPORT_SYMBOL(nfc_se_connectivity);
static void nfc_release(struct device *d)
{
struct nfc_dev *dev = to_nfc_dev(d);
struct nfc_se *se, *n;
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
nfc_genl_data_exit(&dev->genl_data);
kfree(dev->targets);
list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
nfc_genl_se_removed(dev, se->idx);
list_del(&se->list);
kfree(se);
}
ida_simple_remove(&nfc_index_ida, dev->idx);
kfree(dev);
}
static void nfc_check_pres_work(struct work_struct *work)
{
struct nfc_dev *dev = container_of(work, struct nfc_dev,
check_pres_work);
int rc;
device_lock(&dev->dev);
if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) {
rc = dev->ops->check_presence(dev, dev->active_target);
if (rc == -EOPNOTSUPP)