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