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1/*
2 * Copyright (C) 2011 Instituto Nokia de Tecnologia
3 *
4 * Authors:
5 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
6 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, see <http://www.gnu.org/licenses/>.
20 */
21
22#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
23
24#include <linux/init.h>
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/rfkill.h>
29#include <linux/nfc.h>
30
31#include <net/genetlink.h>
32
33#include "nfc.h"
34
35#define VERSION "0.1"
36
37#define NFC_CHECK_PRES_FREQ_MS 2000
38
39int nfc_devlist_generation;
40DEFINE_MUTEX(nfc_devlist_mutex);
41
42/* NFC device ID bitmap */
43static DEFINE_IDA(nfc_index_ida);
44
45int nfc_fw_download(struct nfc_dev *dev, const char *firmware_name)
46{
47 int rc = 0;
48
49 pr_debug("%s do firmware %s\n", dev_name(&dev->dev), firmware_name);
50
51 device_lock(&dev->dev);
52
53 if (!device_is_registered(&dev->dev)) {
54 rc = -ENODEV;
55 goto error;
56 }
57
58 if (dev->dev_up) {
59 rc = -EBUSY;
60 goto error;
61 }
62
63 if (!dev->ops->fw_download) {
64 rc = -EOPNOTSUPP;
65 goto error;
66 }
67
68 dev->fw_download_in_progress = true;
69 rc = dev->ops->fw_download(dev, firmware_name);
70 if (rc)
71 dev->fw_download_in_progress = false;
72
73error:
74 device_unlock(&dev->dev);
75 return rc;
76}
77
78/**
79 * nfc_fw_download_done - inform that a firmware download was completed
80 *
81 * @dev: The nfc device to which firmware was downloaded
82 * @firmware_name: The firmware filename
83 * @result: The positive value of a standard errno value
84 */
85int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
86 u32 result)
87{
88 dev->fw_download_in_progress = false;
89
90 return nfc_genl_fw_download_done(dev, firmware_name, result);
91}
92EXPORT_SYMBOL(nfc_fw_download_done);
93
94/**
95 * nfc_dev_up - turn on the NFC device
96 *
97 * @dev: The nfc device to be turned on
98 *
99 * The device remains up until the nfc_dev_down function is called.
100 */
101int nfc_dev_up(struct nfc_dev *dev)
102{
103 int rc = 0;
104
105 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
106
107 device_lock(&dev->dev);
108
109 if (dev->rfkill && rfkill_blocked(dev->rfkill)) {
110 rc = -ERFKILL;
111 goto error;
112 }
113
114 if (!device_is_registered(&dev->dev)) {
115 rc = -ENODEV;
116 goto error;
117 }
118
119 if (dev->fw_download_in_progress) {
120 rc = -EBUSY;
121 goto error;
122 }
123
124 if (dev->dev_up) {
125 rc = -EALREADY;
126 goto error;
127 }
128
129 if (dev->ops->dev_up)
130 rc = dev->ops->dev_up(dev);
131
132 if (!rc)
133 dev->dev_up = true;
134
135 /* We have to enable the device before discovering SEs */
136 if (dev->ops->discover_se && dev->ops->discover_se(dev))
137 pr_err("SE discovery failed\n");
138
139error:
140 device_unlock(&dev->dev);
141 return rc;
142}
143
144/**
145 * nfc_dev_down - turn off the NFC device
146 *
147 * @dev: The nfc device to be turned off
148 */
149int nfc_dev_down(struct nfc_dev *dev)
150{
151 int rc = 0;
152
153 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
154
155 device_lock(&dev->dev);
156
157 if (!device_is_registered(&dev->dev)) {
158 rc = -ENODEV;
159 goto error;
160 }
161
162 if (!dev->dev_up) {
163 rc = -EALREADY;
164 goto error;
165 }
166
167 if (dev->polling || dev->active_target) {
168 rc = -EBUSY;
169 goto error;
170 }
171
172 if (dev->ops->dev_down)
173 dev->ops->dev_down(dev);
174
175 dev->dev_up = false;
176
177error:
178 device_unlock(&dev->dev);
179 return rc;
180}
181
182static int nfc_rfkill_set_block(void *data, bool blocked)
183{
184 struct nfc_dev *dev = data;
185
186 pr_debug("%s blocked %d", dev_name(&dev->dev), blocked);
187
188 if (!blocked)
189 return 0;
190
191 nfc_dev_down(dev);
192
193 return 0;
194}
195
196static const struct rfkill_ops nfc_rfkill_ops = {
197 .set_block = nfc_rfkill_set_block,
198};
199
200/**
201 * nfc_start_poll - start polling for nfc targets
202 *
203 * @dev: The nfc device that must start polling
204 * @protocols: bitset of nfc protocols that must be used for polling
205 *
206 * The device remains polling for targets until a target is found or
207 * the nfc_stop_poll function is called.
208 */
209int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols)
210{
211 int rc;
212
213 pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n",
214 dev_name(&dev->dev), im_protocols, tm_protocols);
215
216 if (!im_protocols && !tm_protocols)
217 return -EINVAL;
218
219 device_lock(&dev->dev);
220
221 if (!device_is_registered(&dev->dev)) {
222 rc = -ENODEV;
223 goto error;
224 }
225
226 if (!dev->dev_up) {
227 rc = -ENODEV;
228 goto error;
229 }
230
231 if (dev->polling) {
232 rc = -EBUSY;
233 goto error;
234 }
235
236 rc = dev->ops->start_poll(dev, im_protocols, tm_protocols);
237 if (!rc) {
238 dev->polling = true;
239 dev->rf_mode = NFC_RF_NONE;
240 }
241
242error:
243 device_unlock(&dev->dev);
244 return rc;
245}
246
247/**
248 * nfc_stop_poll - stop polling for nfc targets
249 *
250 * @dev: The nfc device that must stop polling
251 */
252int nfc_stop_poll(struct nfc_dev *dev)
253{
254 int rc = 0;
255
256 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
257
258 device_lock(&dev->dev);
259
260 if (!device_is_registered(&dev->dev)) {
261 rc = -ENODEV;
262 goto error;
263 }
264
265 if (!dev->polling) {
266 rc = -EINVAL;
267 goto error;
268 }
269
270 dev->ops->stop_poll(dev);
271 dev->polling = false;
272 dev->rf_mode = NFC_RF_NONE;
273
274error:
275 device_unlock(&dev->dev);
276 return rc;
277}
278
279static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx)
280{
281 int i;
282
283 for (i = 0; i < dev->n_targets; i++) {
284 if (dev->targets[i].idx == target_idx)
285 return &dev->targets[i];
286 }
287
288 return NULL;
289}
290
291int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode)
292{
293 int rc = 0;
294 u8 *gb;
295 size_t gb_len;
296 struct nfc_target *target;
297
298 pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode);
299
300 if (!dev->ops->dep_link_up)
301 return -EOPNOTSUPP;
302
303 device_lock(&dev->dev);
304
305 if (!device_is_registered(&dev->dev)) {
306 rc = -ENODEV;
307 goto error;
308 }
309
310 if (dev->dep_link_up == true) {
311 rc = -EALREADY;
312 goto error;
313 }
314
315 gb = nfc_llcp_general_bytes(dev, &gb_len);
316 if (gb_len > NFC_MAX_GT_LEN) {
317 rc = -EINVAL;
318 goto error;
319 }
320
321 target = nfc_find_target(dev, target_index);
322 if (target == NULL) {
323 rc = -ENOTCONN;
324 goto error;
325 }
326
327 rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len);
328 if (!rc) {
329 dev->active_target = target;
330 dev->rf_mode = NFC_RF_INITIATOR;
331 }
332
333error:
334 device_unlock(&dev->dev);
335 return rc;
336}
337
338int nfc_dep_link_down(struct nfc_dev *dev)
339{
340 int rc = 0;
341
342 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
343
344 if (!dev->ops->dep_link_down)
345 return -EOPNOTSUPP;
346
347 device_lock(&dev->dev);
348
349 if (!device_is_registered(&dev->dev)) {
350 rc = -ENODEV;
351 goto error;
352 }
353
354 if (dev->dep_link_up == false) {
355 rc = -EALREADY;
356 goto error;
357 }
358
359 rc = dev->ops->dep_link_down(dev);
360 if (!rc) {
361 dev->dep_link_up = false;
362 dev->active_target = NULL;
363 dev->rf_mode = NFC_RF_NONE;
364 nfc_llcp_mac_is_down(dev);
365 nfc_genl_dep_link_down_event(dev);
366 }
367
368error:
369 device_unlock(&dev->dev);
370
371 return rc;
372}
373
374int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
375 u8 comm_mode, u8 rf_mode)
376{
377 dev->dep_link_up = true;
378
379 if (!dev->active_target && rf_mode == NFC_RF_INITIATOR) {
380 struct nfc_target *target;
381
382 target = nfc_find_target(dev, target_idx);
383 if (target == NULL)
384 return -ENOTCONN;
385
386 dev->active_target = target;
387 }
388
389 dev->polling = false;
390 dev->rf_mode = rf_mode;
391
392 nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode);
393
394 return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode);
395}
396EXPORT_SYMBOL(nfc_dep_link_is_up);
397
398/**
399 * nfc_activate_target - prepare the target for data exchange
400 *
401 * @dev: The nfc device that found the target
402 * @target_idx: index of the target that must be activated
403 * @protocol: nfc protocol that will be used for data exchange
404 */
405int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
406{
407 int rc;
408 struct nfc_target *target;
409
410 pr_debug("dev_name=%s target_idx=%u protocol=%u\n",
411 dev_name(&dev->dev), target_idx, protocol);
412
413 device_lock(&dev->dev);
414
415 if (!device_is_registered(&dev->dev)) {
416 rc = -ENODEV;
417 goto error;
418 }
419
420 if (dev->active_target) {
421 rc = -EBUSY;
422 goto error;
423 }
424
425 target = nfc_find_target(dev, target_idx);
426 if (target == NULL) {
427 rc = -ENOTCONN;
428 goto error;
429 }
430
431 rc = dev->ops->activate_target(dev, target, protocol);
432 if (!rc) {
433 dev->active_target = target;
434 dev->rf_mode = NFC_RF_INITIATOR;
435
436 if (dev->ops->check_presence && !dev->shutting_down)
437 mod_timer(&dev->check_pres_timer, jiffies +
438 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
439 }
440
441error:
442 device_unlock(&dev->dev);
443 return rc;
444}
445
446/**
447 * nfc_deactivate_target - deactivate a nfc target
448 *
449 * @dev: The nfc device that found the target
450 * @target_idx: index of the target that must be deactivated
451 */
452int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx, u8 mode)
453{
454 int rc = 0;
455
456 pr_debug("dev_name=%s target_idx=%u\n",
457 dev_name(&dev->dev), target_idx);
458
459 device_lock(&dev->dev);
460
461 if (!device_is_registered(&dev->dev)) {
462 rc = -ENODEV;
463 goto error;
464 }
465
466 if (dev->active_target == NULL) {
467 rc = -ENOTCONN;
468 goto error;
469 }
470
471 if (dev->active_target->idx != target_idx) {
472 rc = -ENOTCONN;
473 goto error;
474 }
475
476 if (dev->ops->check_presence)
477 del_timer_sync(&dev->check_pres_timer);
478
479 dev->ops->deactivate_target(dev, dev->active_target, mode);
480 dev->active_target = NULL;
481
482error:
483 device_unlock(&dev->dev);
484 return rc;
485}
486
487/**
488 * nfc_data_exchange - transceive data
489 *
490 * @dev: The nfc device that found the target
491 * @target_idx: index of the target
492 * @skb: data to be sent
493 * @cb: callback called when the response is received
494 * @cb_context: parameter for the callback function
495 *
496 * The user must wait for the callback before calling this function again.
497 */
498int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb,
499 data_exchange_cb_t cb, void *cb_context)
500{
501 int rc;
502
503 pr_debug("dev_name=%s target_idx=%u skb->len=%u\n",
504 dev_name(&dev->dev), target_idx, skb->len);
505
506 device_lock(&dev->dev);
507
508 if (!device_is_registered(&dev->dev)) {
509 rc = -ENODEV;
510 kfree_skb(skb);
511 goto error;
512 }
513
514 if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) {
515 if (dev->active_target->idx != target_idx) {
516 rc = -EADDRNOTAVAIL;
517 kfree_skb(skb);
518 goto error;
519 }
520
521 if (dev->ops->check_presence)
522 del_timer_sync(&dev->check_pres_timer);
523
524 rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb,
525 cb_context);
526
527 if (!rc && dev->ops->check_presence && !dev->shutting_down)
528 mod_timer(&dev->check_pres_timer, jiffies +
529 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
530 } else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) {
531 rc = dev->ops->tm_send(dev, skb);
532 } else {
533 rc = -ENOTCONN;
534 kfree_skb(skb);
535 goto error;
536 }
537
538
539error:
540 device_unlock(&dev->dev);
541 return rc;
542}
543
544struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx)
545{
546 struct nfc_se *se;
547
548 list_for_each_entry(se, &dev->secure_elements, list)
549 if (se->idx == se_idx)
550 return se;
551
552 return NULL;
553}
554EXPORT_SYMBOL(nfc_find_se);
555
556int nfc_enable_se(struct nfc_dev *dev, u32 se_idx)
557{
558 struct nfc_se *se;
559 int rc;
560
561 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
562
563 device_lock(&dev->dev);
564
565 if (!device_is_registered(&dev->dev)) {
566 rc = -ENODEV;
567 goto error;
568 }
569
570 if (!dev->dev_up) {
571 rc = -ENODEV;
572 goto error;
573 }
574
575 if (dev->polling) {
576 rc = -EBUSY;
577 goto error;
578 }
579
580 if (!dev->ops->enable_se || !dev->ops->disable_se) {
581 rc = -EOPNOTSUPP;
582 goto error;
583 }
584
585 se = nfc_find_se(dev, se_idx);
586 if (!se) {
587 rc = -EINVAL;
588 goto error;
589 }
590
591 if (se->state == NFC_SE_ENABLED) {
592 rc = -EALREADY;
593 goto error;
594 }
595
596 rc = dev->ops->enable_se(dev, se_idx);
597 if (rc >= 0)
598 se->state = NFC_SE_ENABLED;
599
600error:
601 device_unlock(&dev->dev);
602 return rc;
603}
604
605int nfc_disable_se(struct nfc_dev *dev, u32 se_idx)
606{
607 struct nfc_se *se;
608 int rc;
609
610 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
611
612 device_lock(&dev->dev);
613
614 if (!device_is_registered(&dev->dev)) {
615 rc = -ENODEV;
616 goto error;
617 }
618
619 if (!dev->dev_up) {
620 rc = -ENODEV;
621 goto error;
622 }
623
624 if (!dev->ops->enable_se || !dev->ops->disable_se) {
625 rc = -EOPNOTSUPP;
626 goto error;
627 }
628
629 se = nfc_find_se(dev, se_idx);
630 if (!se) {
631 rc = -EINVAL;
632 goto error;
633 }
634
635 if (se->state == NFC_SE_DISABLED) {
636 rc = -EALREADY;
637 goto error;
638 }
639
640 rc = dev->ops->disable_se(dev, se_idx);
641 if (rc >= 0)
642 se->state = NFC_SE_DISABLED;
643
644error:
645 device_unlock(&dev->dev);
646 return rc;
647}
648
649int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
650{
651 pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len);
652
653 return nfc_llcp_set_remote_gb(dev, gb, gb_len);
654}
655EXPORT_SYMBOL(nfc_set_remote_general_bytes);
656
657u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
658{
659 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
660
661 return nfc_llcp_general_bytes(dev, gb_len);
662}
663EXPORT_SYMBOL(nfc_get_local_general_bytes);
664
665int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb)
666{
667 /* Only LLCP target mode for now */
668 if (dev->dep_link_up == false) {
669 kfree_skb(skb);
670 return -ENOLINK;
671 }
672
673 return nfc_llcp_data_received(dev, skb);
674}
675EXPORT_SYMBOL(nfc_tm_data_received);
676
677int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
678 u8 *gb, size_t gb_len)
679{
680 int rc;
681
682 device_lock(&dev->dev);
683
684 dev->polling = false;
685
686 if (gb != NULL) {
687 rc = nfc_set_remote_general_bytes(dev, gb, gb_len);
688 if (rc < 0)
689 goto out;
690 }
691
692 dev->rf_mode = NFC_RF_TARGET;
693
694 if (protocol == NFC_PROTO_NFC_DEP_MASK)
695 nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET);
696
697 rc = nfc_genl_tm_activated(dev, protocol);
698
699out:
700 device_unlock(&dev->dev);
701
702 return rc;
703}
704EXPORT_SYMBOL(nfc_tm_activated);
705
706int nfc_tm_deactivated(struct nfc_dev *dev)
707{
708 dev->dep_link_up = false;
709 dev->rf_mode = NFC_RF_NONE;
710
711 return nfc_genl_tm_deactivated(dev);
712}
713EXPORT_SYMBOL(nfc_tm_deactivated);
714
715/**
716 * nfc_alloc_send_skb - allocate a skb for data exchange responses
717 *
718 * @size: size to allocate
719 * @gfp: gfp flags
720 */
721struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
722 unsigned int flags, unsigned int size,
723 unsigned int *err)
724{
725 struct sk_buff *skb;
726 unsigned int total_size;
727
728 total_size = size +
729 dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
730
731 skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err);
732 if (skb)
733 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
734
735 return skb;
736}
737
738/**
739 * nfc_alloc_recv_skb - allocate a skb for data exchange responses
740 *
741 * @size: size to allocate
742 * @gfp: gfp flags
743 */
744struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp)
745{
746 struct sk_buff *skb;
747 unsigned int total_size;
748
749 total_size = size + 1;
750 skb = alloc_skb(total_size, gfp);
751
752 if (skb)
753 skb_reserve(skb, 1);
754
755 return skb;
756}
757EXPORT_SYMBOL(nfc_alloc_recv_skb);
758
759/**
760 * nfc_targets_found - inform that targets were found
761 *
762 * @dev: The nfc device that found the targets
763 * @targets: array of nfc targets found
764 * @ntargets: targets array size
765 *
766 * The device driver must call this function when one or many nfc targets
767 * are found. After calling this function, the device driver must stop
768 * polling for targets.
769 * NOTE: This function can be called with targets=NULL and n_targets=0 to
770 * notify a driver error, meaning that the polling operation cannot complete.
771 * IMPORTANT: this function must not be called from an atomic context.
772 * In addition, it must also not be called from a context that would prevent
773 * the NFC Core to call other nfc ops entry point concurrently.
774 */
775int nfc_targets_found(struct nfc_dev *dev,
776 struct nfc_target *targets, int n_targets)
777{
778 int i;
779
780 pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets);
781
782 for (i = 0; i < n_targets; i++)
783 targets[i].idx = dev->target_next_idx++;
784
785 device_lock(&dev->dev);
786
787 if (dev->polling == false) {
788 device_unlock(&dev->dev);
789 return 0;
790 }
791
792 dev->polling = false;
793
794 dev->targets_generation++;
795
796 kfree(dev->targets);
797 dev->targets = NULL;
798
799 if (targets) {
800 dev->targets = kmemdup(targets,
801 n_targets * sizeof(struct nfc_target),
802 GFP_ATOMIC);
803
804 if (!dev->targets) {
805 dev->n_targets = 0;
806 device_unlock(&dev->dev);
807 return -ENOMEM;
808 }
809 }
810
811 dev->n_targets = n_targets;
812 device_unlock(&dev->dev);
813
814 nfc_genl_targets_found(dev);
815
816 return 0;
817}
818EXPORT_SYMBOL(nfc_targets_found);
819
820/**
821 * nfc_target_lost - inform that an activated target went out of field
822 *
823 * @dev: The nfc device that had the activated target in field
824 * @target_idx: the nfc index of the target
825 *
826 * The device driver must call this function when the activated target
827 * goes out of the field.
828 * IMPORTANT: this function must not be called from an atomic context.
829 * In addition, it must also not be called from a context that would prevent
830 * the NFC Core to call other nfc ops entry point concurrently.
831 */
832int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
833{
834 struct nfc_target *tg;
835 int i;
836
837 pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx);
838
839 device_lock(&dev->dev);
840
841 for (i = 0; i < dev->n_targets; i++) {
842 tg = &dev->targets[i];
843 if (tg->idx == target_idx)
844 break;
845 }
846
847 if (i == dev->n_targets) {
848 device_unlock(&dev->dev);
849 return -EINVAL;
850 }
851
852 dev->targets_generation++;
853 dev->n_targets--;
854 dev->active_target = NULL;
855
856 if (dev->n_targets) {
857 memcpy(&dev->targets[i], &dev->targets[i + 1],
858 (dev->n_targets - i) * sizeof(struct nfc_target));
859 } else {
860 kfree(dev->targets);
861 dev->targets = NULL;
862 }
863
864 device_unlock(&dev->dev);
865
866 nfc_genl_target_lost(dev, target_idx);
867
868 return 0;
869}
870EXPORT_SYMBOL(nfc_target_lost);
871
872inline void nfc_driver_failure(struct nfc_dev *dev, int err)
873{
874 nfc_targets_found(dev, NULL, 0);
875}
876EXPORT_SYMBOL(nfc_driver_failure);
877
878int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type)
879{
880 struct nfc_se *se;
881 int rc;
882
883 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
884
885 se = nfc_find_se(dev, se_idx);
886 if (se)
887 return -EALREADY;
888
889 se = kzalloc(sizeof(struct nfc_se), GFP_KERNEL);
890 if (!se)
891 return -ENOMEM;
892
893 se->idx = se_idx;
894 se->type = type;
895 se->state = NFC_SE_DISABLED;
896 INIT_LIST_HEAD(&se->list);
897
898 list_add(&se->list, &dev->secure_elements);
899
900 rc = nfc_genl_se_added(dev, se_idx, type);
901 if (rc < 0) {
902 list_del(&se->list);
903 kfree(se);
904
905 return rc;
906 }
907
908 return 0;
909}
910EXPORT_SYMBOL(nfc_add_se);
911
912int nfc_remove_se(struct nfc_dev *dev, u32 se_idx)
913{
914 struct nfc_se *se, *n;
915 int rc;
916
917 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
918
919 list_for_each_entry_safe(se, n, &dev->secure_elements, list)
920 if (se->idx == se_idx) {
921 rc = nfc_genl_se_removed(dev, se_idx);
922 if (rc < 0)
923 return rc;
924
925 list_del(&se->list);
926 kfree(se);
927
928 return 0;
929 }
930
931 return -EINVAL;
932}
933EXPORT_SYMBOL(nfc_remove_se);
934
935int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,
936 struct nfc_evt_transaction *evt_transaction)
937{
938 int rc;
939
940 pr_debug("transaction: %x\n", se_idx);
941
942 device_lock(&dev->dev);
943
944 if (!evt_transaction) {
945 rc = -EPROTO;
946 goto out;
947 }
948
949 rc = nfc_genl_se_transaction(dev, se_idx, evt_transaction);
950out:
951 device_unlock(&dev->dev);
952 return rc;
953}
954EXPORT_SYMBOL(nfc_se_transaction);
955
956int nfc_se_connectivity(struct nfc_dev *dev, u8 se_idx)
957{
958 int rc;
959
960 pr_debug("connectivity: %x\n", se_idx);
961
962 device_lock(&dev->dev);
963 rc = nfc_genl_se_connectivity(dev, se_idx);
964 device_unlock(&dev->dev);
965 return rc;
966}
967EXPORT_SYMBOL(nfc_se_connectivity);
968
969static void nfc_release(struct device *d)
970{
971 struct nfc_dev *dev = to_nfc_dev(d);
972 struct nfc_se *se, *n;
973
974 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
975
976 nfc_genl_data_exit(&dev->genl_data);
977 kfree(dev->targets);
978
979 list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
980 nfc_genl_se_removed(dev, se->idx);
981 list_del(&se->list);
982 kfree(se);
983 }
984
985 kfree(dev);
986}
987
988static void nfc_check_pres_work(struct work_struct *work)
989{
990 struct nfc_dev *dev = container_of(work, struct nfc_dev,
991 check_pres_work);
992 int rc;
993
994 device_lock(&dev->dev);
995
996 if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) {
997 rc = dev->ops->check_presence(dev, dev->active_target);
998 if (rc == -EOPNOTSUPP)
999 goto exit;
1000 if (rc) {
1001 u32 active_target_idx = dev->active_target->idx;
1002 device_unlock(&dev->dev);
1003 nfc_target_lost(dev, active_target_idx);
1004 return;
1005 }
1006
1007 if (!dev->shutting_down)
1008 mod_timer(&dev->check_pres_timer, jiffies +
1009 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
1010 }
1011
1012exit:
1013 device_unlock(&dev->dev);
1014}
1015
1016static void nfc_check_pres_timeout(unsigned long data)
1017{
1018 struct nfc_dev *dev = (struct nfc_dev *)data;
1019
1020 schedule_work(&dev->check_pres_work);
1021}
1022
1023struct class nfc_class = {
1024 .name = "nfc",
1025 .dev_release = nfc_release,
1026};
1027EXPORT_SYMBOL(nfc_class);
1028
1029static int match_idx(struct device *d, const void *data)
1030{
1031 struct nfc_dev *dev = to_nfc_dev(d);
1032 const unsigned int *idx = data;
1033
1034 return dev->idx == *idx;
1035}
1036
1037struct nfc_dev *nfc_get_device(unsigned int idx)
1038{
1039 struct device *d;
1040
1041 d = class_find_device(&nfc_class, NULL, &idx, match_idx);
1042 if (!d)
1043 return NULL;
1044
1045 return to_nfc_dev(d);
1046}
1047
1048/**
1049 * nfc_allocate_device - allocate a new nfc device
1050 *
1051 * @ops: device operations
1052 * @supported_protocols: NFC protocols supported by the device
1053 */
1054struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
1055 u32 supported_protocols,
1056 int tx_headroom, int tx_tailroom)
1057{
1058 struct nfc_dev *dev;
1059
1060 if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
1061 !ops->deactivate_target || !ops->im_transceive)
1062 return NULL;
1063
1064 if (!supported_protocols)
1065 return NULL;
1066
1067 dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL);
1068 if (!dev)
1069 return NULL;
1070
1071 dev->ops = ops;
1072 dev->supported_protocols = supported_protocols;
1073 dev->tx_headroom = tx_headroom;
1074 dev->tx_tailroom = tx_tailroom;
1075 INIT_LIST_HEAD(&dev->secure_elements);
1076
1077 nfc_genl_data_init(&dev->genl_data);
1078
1079 dev->rf_mode = NFC_RF_NONE;
1080
1081 /* first generation must not be 0 */
1082 dev->targets_generation = 1;
1083
1084 if (ops->check_presence) {
1085 init_timer(&dev->check_pres_timer);
1086 dev->check_pres_timer.data = (unsigned long)dev;
1087 dev->check_pres_timer.function = nfc_check_pres_timeout;
1088
1089 INIT_WORK(&dev->check_pres_work, nfc_check_pres_work);
1090 }
1091
1092 return dev;
1093}
1094EXPORT_SYMBOL(nfc_allocate_device);
1095
1096/**
1097 * nfc_register_device - register a nfc device in the nfc subsystem
1098 *
1099 * @dev: The nfc device to register
1100 */
1101int nfc_register_device(struct nfc_dev *dev)
1102{
1103 int rc;
1104
1105 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
1106
1107 dev->idx = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL);
1108 if (dev->idx < 0)
1109 return dev->idx;
1110
1111 dev->dev.class = &nfc_class;
1112 dev_set_name(&dev->dev, "nfc%d", dev->idx);
1113 device_initialize(&dev->dev);
1114
1115 mutex_lock(&nfc_devlist_mutex);
1116 nfc_devlist_generation++;
1117 rc = device_add(&dev->dev);
1118 mutex_unlock(&nfc_devlist_mutex);
1119
1120 if (rc < 0)
1121 return rc;
1122
1123 rc = nfc_llcp_register_device(dev);
1124 if (rc)
1125 pr_err("Could not register llcp device\n");
1126
1127 rc = nfc_genl_device_added(dev);
1128 if (rc)
1129 pr_debug("The userspace won't be notified that the device %s was added\n",
1130 dev_name(&dev->dev));
1131
1132 dev->rfkill = rfkill_alloc(dev_name(&dev->dev), &dev->dev,
1133 RFKILL_TYPE_NFC, &nfc_rfkill_ops, dev);
1134 if (dev->rfkill) {
1135 if (rfkill_register(dev->rfkill) < 0) {
1136 rfkill_destroy(dev->rfkill);
1137 dev->rfkill = NULL;
1138 }
1139 }
1140
1141 return 0;
1142}
1143EXPORT_SYMBOL(nfc_register_device);
1144
1145/**
1146 * nfc_unregister_device - unregister a nfc device in the nfc subsystem
1147 *
1148 * @dev: The nfc device to unregister
1149 */
1150void nfc_unregister_device(struct nfc_dev *dev)
1151{
1152 int rc, id;
1153
1154 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
1155
1156 id = dev->idx;
1157
1158 if (dev->rfkill) {
1159 rfkill_unregister(dev->rfkill);
1160 rfkill_destroy(dev->rfkill);
1161 }
1162
1163 if (dev->ops->check_presence) {
1164 device_lock(&dev->dev);
1165 dev->shutting_down = true;
1166 device_unlock(&dev->dev);
1167 del_timer_sync(&dev->check_pres_timer);
1168 cancel_work_sync(&dev->check_pres_work);
1169 }
1170
1171 rc = nfc_genl_device_removed(dev);
1172 if (rc)
1173 pr_debug("The userspace won't be notified that the device %s "
1174 "was removed\n", dev_name(&dev->dev));
1175
1176 nfc_llcp_unregister_device(dev);
1177
1178 mutex_lock(&nfc_devlist_mutex);
1179 nfc_devlist_generation++;
1180 device_del(&dev->dev);
1181 mutex_unlock(&nfc_devlist_mutex);
1182
1183 ida_simple_remove(&nfc_index_ida, id);
1184}
1185EXPORT_SYMBOL(nfc_unregister_device);
1186
1187static int __init nfc_init(void)
1188{
1189 int rc;
1190
1191 pr_info("NFC Core ver %s\n", VERSION);
1192
1193 rc = class_register(&nfc_class);
1194 if (rc)
1195 return rc;
1196
1197 rc = nfc_genl_init();
1198 if (rc)
1199 goto err_genl;
1200
1201 /* the first generation must not be 0 */
1202 nfc_devlist_generation = 1;
1203
1204 rc = rawsock_init();
1205 if (rc)
1206 goto err_rawsock;
1207
1208 rc = nfc_llcp_init();
1209 if (rc)
1210 goto err_llcp_sock;
1211
1212 rc = af_nfc_init();
1213 if (rc)
1214 goto err_af_nfc;
1215
1216 return 0;
1217
1218err_af_nfc:
1219 nfc_llcp_exit();
1220err_llcp_sock:
1221 rawsock_exit();
1222err_rawsock:
1223 nfc_genl_exit();
1224err_genl:
1225 class_unregister(&nfc_class);
1226 return rc;
1227}
1228
1229static void __exit nfc_exit(void)
1230{
1231 af_nfc_exit();
1232 nfc_llcp_exit();
1233 rawsock_exit();
1234 nfc_genl_exit();
1235 class_unregister(&nfc_class);
1236}
1237
1238subsys_initcall(nfc_init);
1239module_exit(nfc_exit);
1240
1241MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
1242MODULE_DESCRIPTION("NFC Core ver " VERSION);
1243MODULE_VERSION(VERSION);
1244MODULE_LICENSE("GPL");
1245MODULE_ALIAS_NETPROTO(PF_NFC);
1246MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2011 Instituto Nokia de Tecnologia
4 *
5 * Authors:
6 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
7 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
11
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/rfkill.h>
17#include <linux/nfc.h>
18
19#include <net/genetlink.h>
20
21#include "nfc.h"
22
23#define VERSION "0.1"
24
25#define NFC_CHECK_PRES_FREQ_MS 2000
26
27int nfc_devlist_generation;
28DEFINE_MUTEX(nfc_devlist_mutex);
29
30/* NFC device ID bitmap */
31static DEFINE_IDA(nfc_index_ida);
32
33int nfc_fw_download(struct nfc_dev *dev, const char *firmware_name)
34{
35 int rc = 0;
36
37 pr_debug("%s do firmware %s\n", dev_name(&dev->dev), firmware_name);
38
39 device_lock(&dev->dev);
40
41 if (!device_is_registered(&dev->dev)) {
42 rc = -ENODEV;
43 goto error;
44 }
45
46 if (dev->dev_up) {
47 rc = -EBUSY;
48 goto error;
49 }
50
51 if (!dev->ops->fw_download) {
52 rc = -EOPNOTSUPP;
53 goto error;
54 }
55
56 dev->fw_download_in_progress = true;
57 rc = dev->ops->fw_download(dev, firmware_name);
58 if (rc)
59 dev->fw_download_in_progress = false;
60
61error:
62 device_unlock(&dev->dev);
63 return rc;
64}
65
66/**
67 * nfc_fw_download_done - inform that a firmware download was completed
68 *
69 * @dev: The nfc device to which firmware was downloaded
70 * @firmware_name: The firmware filename
71 * @result: The positive value of a standard errno value
72 */
73int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
74 u32 result)
75{
76 dev->fw_download_in_progress = false;
77
78 return nfc_genl_fw_download_done(dev, firmware_name, result);
79}
80EXPORT_SYMBOL(nfc_fw_download_done);
81
82/**
83 * nfc_dev_up - turn on the NFC device
84 *
85 * @dev: The nfc device to be turned on
86 *
87 * The device remains up until the nfc_dev_down function is called.
88 */
89int nfc_dev_up(struct nfc_dev *dev)
90{
91 int rc = 0;
92
93 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
94
95 device_lock(&dev->dev);
96
97 if (dev->rfkill && rfkill_blocked(dev->rfkill)) {
98 rc = -ERFKILL;
99 goto error;
100 }
101
102 if (!device_is_registered(&dev->dev)) {
103 rc = -ENODEV;
104 goto error;
105 }
106
107 if (dev->fw_download_in_progress) {
108 rc = -EBUSY;
109 goto error;
110 }
111
112 if (dev->dev_up) {
113 rc = -EALREADY;
114 goto error;
115 }
116
117 if (dev->ops->dev_up)
118 rc = dev->ops->dev_up(dev);
119
120 if (!rc)
121 dev->dev_up = true;
122
123 /* We have to enable the device before discovering SEs */
124 if (dev->ops->discover_se && dev->ops->discover_se(dev))
125 pr_err("SE discovery failed\n");
126
127error:
128 device_unlock(&dev->dev);
129 return rc;
130}
131
132/**
133 * nfc_dev_down - turn off the NFC device
134 *
135 * @dev: The nfc device to be turned off
136 */
137int nfc_dev_down(struct nfc_dev *dev)
138{
139 int rc = 0;
140
141 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
142
143 device_lock(&dev->dev);
144
145 if (!device_is_registered(&dev->dev)) {
146 rc = -ENODEV;
147 goto error;
148 }
149
150 if (!dev->dev_up) {
151 rc = -EALREADY;
152 goto error;
153 }
154
155 if (dev->polling || dev->active_target) {
156 rc = -EBUSY;
157 goto error;
158 }
159
160 if (dev->ops->dev_down)
161 dev->ops->dev_down(dev);
162
163 dev->dev_up = false;
164
165error:
166 device_unlock(&dev->dev);
167 return rc;
168}
169
170static int nfc_rfkill_set_block(void *data, bool blocked)
171{
172 struct nfc_dev *dev = data;
173
174 pr_debug("%s blocked %d", dev_name(&dev->dev), blocked);
175
176 if (!blocked)
177 return 0;
178
179 nfc_dev_down(dev);
180
181 return 0;
182}
183
184static const struct rfkill_ops nfc_rfkill_ops = {
185 .set_block = nfc_rfkill_set_block,
186};
187
188/**
189 * nfc_start_poll - start polling for nfc targets
190 *
191 * @dev: The nfc device that must start polling
192 * @protocols: bitset of nfc protocols that must be used for polling
193 *
194 * The device remains polling for targets until a target is found or
195 * the nfc_stop_poll function is called.
196 */
197int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols)
198{
199 int rc;
200
201 pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n",
202 dev_name(&dev->dev), im_protocols, tm_protocols);
203
204 if (!im_protocols && !tm_protocols)
205 return -EINVAL;
206
207 device_lock(&dev->dev);
208
209 if (!device_is_registered(&dev->dev)) {
210 rc = -ENODEV;
211 goto error;
212 }
213
214 if (!dev->dev_up) {
215 rc = -ENODEV;
216 goto error;
217 }
218
219 if (dev->polling) {
220 rc = -EBUSY;
221 goto error;
222 }
223
224 rc = dev->ops->start_poll(dev, im_protocols, tm_protocols);
225 if (!rc) {
226 dev->polling = true;
227 dev->rf_mode = NFC_RF_NONE;
228 }
229
230error:
231 device_unlock(&dev->dev);
232 return rc;
233}
234
235/**
236 * nfc_stop_poll - stop polling for nfc targets
237 *
238 * @dev: The nfc device that must stop polling
239 */
240int nfc_stop_poll(struct nfc_dev *dev)
241{
242 int rc = 0;
243
244 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
245
246 device_lock(&dev->dev);
247
248 if (!device_is_registered(&dev->dev)) {
249 rc = -ENODEV;
250 goto error;
251 }
252
253 if (!dev->polling) {
254 rc = -EINVAL;
255 goto error;
256 }
257
258 dev->ops->stop_poll(dev);
259 dev->polling = false;
260 dev->rf_mode = NFC_RF_NONE;
261
262error:
263 device_unlock(&dev->dev);
264 return rc;
265}
266
267static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx)
268{
269 int i;
270
271 for (i = 0; i < dev->n_targets; i++) {
272 if (dev->targets[i].idx == target_idx)
273 return &dev->targets[i];
274 }
275
276 return NULL;
277}
278
279int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode)
280{
281 int rc = 0;
282 u8 *gb;
283 size_t gb_len;
284 struct nfc_target *target;
285
286 pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode);
287
288 if (!dev->ops->dep_link_up)
289 return -EOPNOTSUPP;
290
291 device_lock(&dev->dev);
292
293 if (!device_is_registered(&dev->dev)) {
294 rc = -ENODEV;
295 goto error;
296 }
297
298 if (dev->dep_link_up == true) {
299 rc = -EALREADY;
300 goto error;
301 }
302
303 gb = nfc_llcp_general_bytes(dev, &gb_len);
304 if (gb_len > NFC_MAX_GT_LEN) {
305 rc = -EINVAL;
306 goto error;
307 }
308
309 target = nfc_find_target(dev, target_index);
310 if (target == NULL) {
311 rc = -ENOTCONN;
312 goto error;
313 }
314
315 rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len);
316 if (!rc) {
317 dev->active_target = target;
318 dev->rf_mode = NFC_RF_INITIATOR;
319 }
320
321error:
322 device_unlock(&dev->dev);
323 return rc;
324}
325
326int nfc_dep_link_down(struct nfc_dev *dev)
327{
328 int rc = 0;
329
330 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
331
332 if (!dev->ops->dep_link_down)
333 return -EOPNOTSUPP;
334
335 device_lock(&dev->dev);
336
337 if (!device_is_registered(&dev->dev)) {
338 rc = -ENODEV;
339 goto error;
340 }
341
342 if (dev->dep_link_up == false) {
343 rc = -EALREADY;
344 goto error;
345 }
346
347 rc = dev->ops->dep_link_down(dev);
348 if (!rc) {
349 dev->dep_link_up = false;
350 dev->active_target = NULL;
351 dev->rf_mode = NFC_RF_NONE;
352 nfc_llcp_mac_is_down(dev);
353 nfc_genl_dep_link_down_event(dev);
354 }
355
356error:
357 device_unlock(&dev->dev);
358
359 return rc;
360}
361
362int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
363 u8 comm_mode, u8 rf_mode)
364{
365 dev->dep_link_up = true;
366
367 if (!dev->active_target && rf_mode == NFC_RF_INITIATOR) {
368 struct nfc_target *target;
369
370 target = nfc_find_target(dev, target_idx);
371 if (target == NULL)
372 return -ENOTCONN;
373
374 dev->active_target = target;
375 }
376
377 dev->polling = false;
378 dev->rf_mode = rf_mode;
379
380 nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode);
381
382 return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode);
383}
384EXPORT_SYMBOL(nfc_dep_link_is_up);
385
386/**
387 * nfc_activate_target - prepare the target for data exchange
388 *
389 * @dev: The nfc device that found the target
390 * @target_idx: index of the target that must be activated
391 * @protocol: nfc protocol that will be used for data exchange
392 */
393int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
394{
395 int rc;
396 struct nfc_target *target;
397
398 pr_debug("dev_name=%s target_idx=%u protocol=%u\n",
399 dev_name(&dev->dev), target_idx, protocol);
400
401 device_lock(&dev->dev);
402
403 if (!device_is_registered(&dev->dev)) {
404 rc = -ENODEV;
405 goto error;
406 }
407
408 if (dev->active_target) {
409 rc = -EBUSY;
410 goto error;
411 }
412
413 target = nfc_find_target(dev, target_idx);
414 if (target == NULL) {
415 rc = -ENOTCONN;
416 goto error;
417 }
418
419 rc = dev->ops->activate_target(dev, target, protocol);
420 if (!rc) {
421 dev->active_target = target;
422 dev->rf_mode = NFC_RF_INITIATOR;
423
424 if (dev->ops->check_presence && !dev->shutting_down)
425 mod_timer(&dev->check_pres_timer, jiffies +
426 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
427 }
428
429error:
430 device_unlock(&dev->dev);
431 return rc;
432}
433
434/**
435 * nfc_deactivate_target - deactivate a nfc target
436 *
437 * @dev: The nfc device that found the target
438 * @target_idx: index of the target that must be deactivated
439 */
440int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx, u8 mode)
441{
442 int rc = 0;
443
444 pr_debug("dev_name=%s target_idx=%u\n",
445 dev_name(&dev->dev), target_idx);
446
447 device_lock(&dev->dev);
448
449 if (!device_is_registered(&dev->dev)) {
450 rc = -ENODEV;
451 goto error;
452 }
453
454 if (dev->active_target == NULL) {
455 rc = -ENOTCONN;
456 goto error;
457 }
458
459 if (dev->active_target->idx != target_idx) {
460 rc = -ENOTCONN;
461 goto error;
462 }
463
464 if (dev->ops->check_presence)
465 del_timer_sync(&dev->check_pres_timer);
466
467 dev->ops->deactivate_target(dev, dev->active_target, mode);
468 dev->active_target = NULL;
469
470error:
471 device_unlock(&dev->dev);
472 return rc;
473}
474
475/**
476 * nfc_data_exchange - transceive data
477 *
478 * @dev: The nfc device that found the target
479 * @target_idx: index of the target
480 * @skb: data to be sent
481 * @cb: callback called when the response is received
482 * @cb_context: parameter for the callback function
483 *
484 * The user must wait for the callback before calling this function again.
485 */
486int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb,
487 data_exchange_cb_t cb, void *cb_context)
488{
489 int rc;
490
491 pr_debug("dev_name=%s target_idx=%u skb->len=%u\n",
492 dev_name(&dev->dev), target_idx, skb->len);
493
494 device_lock(&dev->dev);
495
496 if (!device_is_registered(&dev->dev)) {
497 rc = -ENODEV;
498 kfree_skb(skb);
499 goto error;
500 }
501
502 if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) {
503 if (dev->active_target->idx != target_idx) {
504 rc = -EADDRNOTAVAIL;
505 kfree_skb(skb);
506 goto error;
507 }
508
509 if (dev->ops->check_presence)
510 del_timer_sync(&dev->check_pres_timer);
511
512 rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb,
513 cb_context);
514
515 if (!rc && dev->ops->check_presence && !dev->shutting_down)
516 mod_timer(&dev->check_pres_timer, jiffies +
517 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
518 } else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) {
519 rc = dev->ops->tm_send(dev, skb);
520 } else {
521 rc = -ENOTCONN;
522 kfree_skb(skb);
523 goto error;
524 }
525
526
527error:
528 device_unlock(&dev->dev);
529 return rc;
530}
531
532struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx)
533{
534 struct nfc_se *se;
535
536 list_for_each_entry(se, &dev->secure_elements, list)
537 if (se->idx == se_idx)
538 return se;
539
540 return NULL;
541}
542EXPORT_SYMBOL(nfc_find_se);
543
544int nfc_enable_se(struct nfc_dev *dev, u32 se_idx)
545{
546 struct nfc_se *se;
547 int rc;
548
549 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
550
551 device_lock(&dev->dev);
552
553 if (!device_is_registered(&dev->dev)) {
554 rc = -ENODEV;
555 goto error;
556 }
557
558 if (!dev->dev_up) {
559 rc = -ENODEV;
560 goto error;
561 }
562
563 if (dev->polling) {
564 rc = -EBUSY;
565 goto error;
566 }
567
568 if (!dev->ops->enable_se || !dev->ops->disable_se) {
569 rc = -EOPNOTSUPP;
570 goto error;
571 }
572
573 se = nfc_find_se(dev, se_idx);
574 if (!se) {
575 rc = -EINVAL;
576 goto error;
577 }
578
579 if (se->state == NFC_SE_ENABLED) {
580 rc = -EALREADY;
581 goto error;
582 }
583
584 rc = dev->ops->enable_se(dev, se_idx);
585 if (rc >= 0)
586 se->state = NFC_SE_ENABLED;
587
588error:
589 device_unlock(&dev->dev);
590 return rc;
591}
592
593int nfc_disable_se(struct nfc_dev *dev, u32 se_idx)
594{
595 struct nfc_se *se;
596 int rc;
597
598 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
599
600 device_lock(&dev->dev);
601
602 if (!device_is_registered(&dev->dev)) {
603 rc = -ENODEV;
604 goto error;
605 }
606
607 if (!dev->dev_up) {
608 rc = -ENODEV;
609 goto error;
610 }
611
612 if (!dev->ops->enable_se || !dev->ops->disable_se) {
613 rc = -EOPNOTSUPP;
614 goto error;
615 }
616
617 se = nfc_find_se(dev, se_idx);
618 if (!se) {
619 rc = -EINVAL;
620 goto error;
621 }
622
623 if (se->state == NFC_SE_DISABLED) {
624 rc = -EALREADY;
625 goto error;
626 }
627
628 rc = dev->ops->disable_se(dev, se_idx);
629 if (rc >= 0)
630 se->state = NFC_SE_DISABLED;
631
632error:
633 device_unlock(&dev->dev);
634 return rc;
635}
636
637int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
638{
639 pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len);
640
641 return nfc_llcp_set_remote_gb(dev, gb, gb_len);
642}
643EXPORT_SYMBOL(nfc_set_remote_general_bytes);
644
645u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
646{
647 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
648
649 return nfc_llcp_general_bytes(dev, gb_len);
650}
651EXPORT_SYMBOL(nfc_get_local_general_bytes);
652
653int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb)
654{
655 /* Only LLCP target mode for now */
656 if (dev->dep_link_up == false) {
657 kfree_skb(skb);
658 return -ENOLINK;
659 }
660
661 return nfc_llcp_data_received(dev, skb);
662}
663EXPORT_SYMBOL(nfc_tm_data_received);
664
665int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
666 u8 *gb, size_t gb_len)
667{
668 int rc;
669
670 device_lock(&dev->dev);
671
672 dev->polling = false;
673
674 if (gb != NULL) {
675 rc = nfc_set_remote_general_bytes(dev, gb, gb_len);
676 if (rc < 0)
677 goto out;
678 }
679
680 dev->rf_mode = NFC_RF_TARGET;
681
682 if (protocol == NFC_PROTO_NFC_DEP_MASK)
683 nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET);
684
685 rc = nfc_genl_tm_activated(dev, protocol);
686
687out:
688 device_unlock(&dev->dev);
689
690 return rc;
691}
692EXPORT_SYMBOL(nfc_tm_activated);
693
694int nfc_tm_deactivated(struct nfc_dev *dev)
695{
696 dev->dep_link_up = false;
697 dev->rf_mode = NFC_RF_NONE;
698
699 return nfc_genl_tm_deactivated(dev);
700}
701EXPORT_SYMBOL(nfc_tm_deactivated);
702
703/**
704 * nfc_alloc_send_skb - allocate a skb for data exchange responses
705 *
706 * @size: size to allocate
707 * @gfp: gfp flags
708 */
709struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
710 unsigned int flags, unsigned int size,
711 unsigned int *err)
712{
713 struct sk_buff *skb;
714 unsigned int total_size;
715
716 total_size = size +
717 dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
718
719 skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err);
720 if (skb)
721 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
722
723 return skb;
724}
725
726/**
727 * nfc_alloc_recv_skb - allocate a skb for data exchange responses
728 *
729 * @size: size to allocate
730 * @gfp: gfp flags
731 */
732struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp)
733{
734 struct sk_buff *skb;
735 unsigned int total_size;
736
737 total_size = size + 1;
738 skb = alloc_skb(total_size, gfp);
739
740 if (skb)
741 skb_reserve(skb, 1);
742
743 return skb;
744}
745EXPORT_SYMBOL(nfc_alloc_recv_skb);
746
747/**
748 * nfc_targets_found - inform that targets were found
749 *
750 * @dev: The nfc device that found the targets
751 * @targets: array of nfc targets found
752 * @ntargets: targets array size
753 *
754 * The device driver must call this function when one or many nfc targets
755 * are found. After calling this function, the device driver must stop
756 * polling for targets.
757 * NOTE: This function can be called with targets=NULL and n_targets=0 to
758 * notify a driver error, meaning that the polling operation cannot complete.
759 * IMPORTANT: this function must not be called from an atomic context.
760 * In addition, it must also not be called from a context that would prevent
761 * the NFC Core to call other nfc ops entry point concurrently.
762 */
763int nfc_targets_found(struct nfc_dev *dev,
764 struct nfc_target *targets, int n_targets)
765{
766 int i;
767
768 pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets);
769
770 for (i = 0; i < n_targets; i++)
771 targets[i].idx = dev->target_next_idx++;
772
773 device_lock(&dev->dev);
774
775 if (dev->polling == false) {
776 device_unlock(&dev->dev);
777 return 0;
778 }
779
780 dev->polling = false;
781
782 dev->targets_generation++;
783
784 kfree(dev->targets);
785 dev->targets = NULL;
786
787 if (targets) {
788 dev->targets = kmemdup(targets,
789 n_targets * sizeof(struct nfc_target),
790 GFP_ATOMIC);
791
792 if (!dev->targets) {
793 dev->n_targets = 0;
794 device_unlock(&dev->dev);
795 return -ENOMEM;
796 }
797 }
798
799 dev->n_targets = n_targets;
800 device_unlock(&dev->dev);
801
802 nfc_genl_targets_found(dev);
803
804 return 0;
805}
806EXPORT_SYMBOL(nfc_targets_found);
807
808/**
809 * nfc_target_lost - inform that an activated target went out of field
810 *
811 * @dev: The nfc device that had the activated target in field
812 * @target_idx: the nfc index of the target
813 *
814 * The device driver must call this function when the activated target
815 * goes out of the field.
816 * IMPORTANT: this function must not be called from an atomic context.
817 * In addition, it must also not be called from a context that would prevent
818 * the NFC Core to call other nfc ops entry point concurrently.
819 */
820int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
821{
822 struct nfc_target *tg;
823 int i;
824
825 pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx);
826
827 device_lock(&dev->dev);
828
829 for (i = 0; i < dev->n_targets; i++) {
830 tg = &dev->targets[i];
831 if (tg->idx == target_idx)
832 break;
833 }
834
835 if (i == dev->n_targets) {
836 device_unlock(&dev->dev);
837 return -EINVAL;
838 }
839
840 dev->targets_generation++;
841 dev->n_targets--;
842 dev->active_target = NULL;
843
844 if (dev->n_targets) {
845 memcpy(&dev->targets[i], &dev->targets[i + 1],
846 (dev->n_targets - i) * sizeof(struct nfc_target));
847 } else {
848 kfree(dev->targets);
849 dev->targets = NULL;
850 }
851
852 device_unlock(&dev->dev);
853
854 nfc_genl_target_lost(dev, target_idx);
855
856 return 0;
857}
858EXPORT_SYMBOL(nfc_target_lost);
859
860inline void nfc_driver_failure(struct nfc_dev *dev, int err)
861{
862 nfc_targets_found(dev, NULL, 0);
863}
864EXPORT_SYMBOL(nfc_driver_failure);
865
866int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type)
867{
868 struct nfc_se *se;
869 int rc;
870
871 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
872
873 se = nfc_find_se(dev, se_idx);
874 if (se)
875 return -EALREADY;
876
877 se = kzalloc(sizeof(struct nfc_se), GFP_KERNEL);
878 if (!se)
879 return -ENOMEM;
880
881 se->idx = se_idx;
882 se->type = type;
883 se->state = NFC_SE_DISABLED;
884 INIT_LIST_HEAD(&se->list);
885
886 list_add(&se->list, &dev->secure_elements);
887
888 rc = nfc_genl_se_added(dev, se_idx, type);
889 if (rc < 0) {
890 list_del(&se->list);
891 kfree(se);
892
893 return rc;
894 }
895
896 return 0;
897}
898EXPORT_SYMBOL(nfc_add_se);
899
900int nfc_remove_se(struct nfc_dev *dev, u32 se_idx)
901{
902 struct nfc_se *se, *n;
903 int rc;
904
905 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
906
907 list_for_each_entry_safe(se, n, &dev->secure_elements, list)
908 if (se->idx == se_idx) {
909 rc = nfc_genl_se_removed(dev, se_idx);
910 if (rc < 0)
911 return rc;
912
913 list_del(&se->list);
914 kfree(se);
915
916 return 0;
917 }
918
919 return -EINVAL;
920}
921EXPORT_SYMBOL(nfc_remove_se);
922
923int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,
924 struct nfc_evt_transaction *evt_transaction)
925{
926 int rc;
927
928 pr_debug("transaction: %x\n", se_idx);
929
930 device_lock(&dev->dev);
931
932 if (!evt_transaction) {
933 rc = -EPROTO;
934 goto out;
935 }
936
937 rc = nfc_genl_se_transaction(dev, se_idx, evt_transaction);
938out:
939 device_unlock(&dev->dev);
940 return rc;
941}
942EXPORT_SYMBOL(nfc_se_transaction);
943
944int nfc_se_connectivity(struct nfc_dev *dev, u8 se_idx)
945{
946 int rc;
947
948 pr_debug("connectivity: %x\n", se_idx);
949
950 device_lock(&dev->dev);
951 rc = nfc_genl_se_connectivity(dev, se_idx);
952 device_unlock(&dev->dev);
953 return rc;
954}
955EXPORT_SYMBOL(nfc_se_connectivity);
956
957static void nfc_release(struct device *d)
958{
959 struct nfc_dev *dev = to_nfc_dev(d);
960 struct nfc_se *se, *n;
961
962 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
963
964 nfc_genl_data_exit(&dev->genl_data);
965 kfree(dev->targets);
966
967 list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
968 nfc_genl_se_removed(dev, se->idx);
969 list_del(&se->list);
970 kfree(se);
971 }
972
973 ida_simple_remove(&nfc_index_ida, dev->idx);
974
975 kfree(dev);
976}
977
978static void nfc_check_pres_work(struct work_struct *work)
979{
980 struct nfc_dev *dev = container_of(work, struct nfc_dev,
981 check_pres_work);
982 int rc;
983
984 device_lock(&dev->dev);
985
986 if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) {
987 rc = dev->ops->check_presence(dev, dev->active_target);
988 if (rc == -EOPNOTSUPP)
989 goto exit;
990 if (rc) {
991 u32 active_target_idx = dev->active_target->idx;
992 device_unlock(&dev->dev);
993 nfc_target_lost(dev, active_target_idx);
994 return;
995 }
996
997 if (!dev->shutting_down)
998 mod_timer(&dev->check_pres_timer, jiffies +
999 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
1000 }
1001
1002exit:
1003 device_unlock(&dev->dev);
1004}
1005
1006static void nfc_check_pres_timeout(struct timer_list *t)
1007{
1008 struct nfc_dev *dev = from_timer(dev, t, check_pres_timer);
1009
1010 schedule_work(&dev->check_pres_work);
1011}
1012
1013struct class nfc_class = {
1014 .name = "nfc",
1015 .dev_release = nfc_release,
1016};
1017EXPORT_SYMBOL(nfc_class);
1018
1019static int match_idx(struct device *d, const void *data)
1020{
1021 struct nfc_dev *dev = to_nfc_dev(d);
1022 const unsigned int *idx = data;
1023
1024 return dev->idx == *idx;
1025}
1026
1027struct nfc_dev *nfc_get_device(unsigned int idx)
1028{
1029 struct device *d;
1030
1031 d = class_find_device(&nfc_class, NULL, &idx, match_idx);
1032 if (!d)
1033 return NULL;
1034
1035 return to_nfc_dev(d);
1036}
1037
1038/**
1039 * nfc_allocate_device - allocate a new nfc device
1040 *
1041 * @ops: device operations
1042 * @supported_protocols: NFC protocols supported by the device
1043 */
1044struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
1045 u32 supported_protocols,
1046 int tx_headroom, int tx_tailroom)
1047{
1048 struct nfc_dev *dev;
1049 int rc;
1050
1051 if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
1052 !ops->deactivate_target || !ops->im_transceive)
1053 return NULL;
1054
1055 if (!supported_protocols)
1056 return NULL;
1057
1058 dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL);
1059 if (!dev)
1060 return NULL;
1061
1062 rc = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL);
1063 if (rc < 0)
1064 goto err_free_dev;
1065 dev->idx = rc;
1066
1067 dev->dev.class = &nfc_class;
1068 dev_set_name(&dev->dev, "nfc%d", dev->idx);
1069 device_initialize(&dev->dev);
1070
1071 dev->ops = ops;
1072 dev->supported_protocols = supported_protocols;
1073 dev->tx_headroom = tx_headroom;
1074 dev->tx_tailroom = tx_tailroom;
1075 INIT_LIST_HEAD(&dev->secure_elements);
1076
1077 nfc_genl_data_init(&dev->genl_data);
1078
1079 dev->rf_mode = NFC_RF_NONE;
1080
1081 /* first generation must not be 0 */
1082 dev->targets_generation = 1;
1083
1084 if (ops->check_presence) {
1085 timer_setup(&dev->check_pres_timer, nfc_check_pres_timeout, 0);
1086 INIT_WORK(&dev->check_pres_work, nfc_check_pres_work);
1087 }
1088
1089 return dev;
1090
1091err_free_dev:
1092 kfree(dev);
1093
1094 return NULL;
1095}
1096EXPORT_SYMBOL(nfc_allocate_device);
1097
1098/**
1099 * nfc_register_device - register a nfc device in the nfc subsystem
1100 *
1101 * @dev: The nfc device to register
1102 */
1103int nfc_register_device(struct nfc_dev *dev)
1104{
1105 int rc;
1106
1107 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
1108
1109 mutex_lock(&nfc_devlist_mutex);
1110 nfc_devlist_generation++;
1111 rc = device_add(&dev->dev);
1112 mutex_unlock(&nfc_devlist_mutex);
1113
1114 if (rc < 0)
1115 return rc;
1116
1117 rc = nfc_llcp_register_device(dev);
1118 if (rc)
1119 pr_err("Could not register llcp device\n");
1120
1121 rc = nfc_genl_device_added(dev);
1122 if (rc)
1123 pr_debug("The userspace won't be notified that the device %s was added\n",
1124 dev_name(&dev->dev));
1125
1126 dev->rfkill = rfkill_alloc(dev_name(&dev->dev), &dev->dev,
1127 RFKILL_TYPE_NFC, &nfc_rfkill_ops, dev);
1128 if (dev->rfkill) {
1129 if (rfkill_register(dev->rfkill) < 0) {
1130 rfkill_destroy(dev->rfkill);
1131 dev->rfkill = NULL;
1132 }
1133 }
1134
1135 return 0;
1136}
1137EXPORT_SYMBOL(nfc_register_device);
1138
1139/**
1140 * nfc_unregister_device - unregister a nfc device in the nfc subsystem
1141 *
1142 * @dev: The nfc device to unregister
1143 */
1144void nfc_unregister_device(struct nfc_dev *dev)
1145{
1146 int rc;
1147
1148 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
1149
1150 if (dev->rfkill) {
1151 rfkill_unregister(dev->rfkill);
1152 rfkill_destroy(dev->rfkill);
1153 }
1154
1155 if (dev->ops->check_presence) {
1156 device_lock(&dev->dev);
1157 dev->shutting_down = true;
1158 device_unlock(&dev->dev);
1159 del_timer_sync(&dev->check_pres_timer);
1160 cancel_work_sync(&dev->check_pres_work);
1161 }
1162
1163 rc = nfc_genl_device_removed(dev);
1164 if (rc)
1165 pr_debug("The userspace won't be notified that the device %s "
1166 "was removed\n", dev_name(&dev->dev));
1167
1168 nfc_llcp_unregister_device(dev);
1169
1170 mutex_lock(&nfc_devlist_mutex);
1171 nfc_devlist_generation++;
1172 device_del(&dev->dev);
1173 mutex_unlock(&nfc_devlist_mutex);
1174}
1175EXPORT_SYMBOL(nfc_unregister_device);
1176
1177static int __init nfc_init(void)
1178{
1179 int rc;
1180
1181 pr_info("NFC Core ver %s\n", VERSION);
1182
1183 rc = class_register(&nfc_class);
1184 if (rc)
1185 return rc;
1186
1187 rc = nfc_genl_init();
1188 if (rc)
1189 goto err_genl;
1190
1191 /* the first generation must not be 0 */
1192 nfc_devlist_generation = 1;
1193
1194 rc = rawsock_init();
1195 if (rc)
1196 goto err_rawsock;
1197
1198 rc = nfc_llcp_init();
1199 if (rc)
1200 goto err_llcp_sock;
1201
1202 rc = af_nfc_init();
1203 if (rc)
1204 goto err_af_nfc;
1205
1206 return 0;
1207
1208err_af_nfc:
1209 nfc_llcp_exit();
1210err_llcp_sock:
1211 rawsock_exit();
1212err_rawsock:
1213 nfc_genl_exit();
1214err_genl:
1215 class_unregister(&nfc_class);
1216 return rc;
1217}
1218
1219static void __exit nfc_exit(void)
1220{
1221 af_nfc_exit();
1222 nfc_llcp_exit();
1223 rawsock_exit();
1224 nfc_genl_exit();
1225 class_unregister(&nfc_class);
1226}
1227
1228subsys_initcall(nfc_init);
1229module_exit(nfc_exit);
1230
1231MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
1232MODULE_DESCRIPTION("NFC Core ver " VERSION);
1233MODULE_VERSION(VERSION);
1234MODULE_LICENSE("GPL");
1235MODULE_ALIAS_NETPROTO(PF_NFC);
1236MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME);