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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, write to the
20 * Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23
24#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
25
26#include <linux/init.h>
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/slab.h>
30#include <linux/nfc.h>
31
32#include "nfc.h"
33
34#define VERSION "0.1"
35
36#define NFC_CHECK_PRES_FREQ_MS 2000
37
38int nfc_devlist_generation;
39DEFINE_MUTEX(nfc_devlist_mutex);
40
41/**
42 * nfc_dev_up - turn on the NFC device
43 *
44 * @dev: The nfc device to be turned on
45 *
46 * The device remains up until the nfc_dev_down function is called.
47 */
48int nfc_dev_up(struct nfc_dev *dev)
49{
50 int rc = 0;
51
52 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
53
54 device_lock(&dev->dev);
55
56 if (!device_is_registered(&dev->dev)) {
57 rc = -ENODEV;
58 goto error;
59 }
60
61 if (dev->dev_up) {
62 rc = -EALREADY;
63 goto error;
64 }
65
66 if (dev->ops->dev_up)
67 rc = dev->ops->dev_up(dev);
68
69 if (!rc)
70 dev->dev_up = true;
71
72error:
73 device_unlock(&dev->dev);
74 return rc;
75}
76
77/**
78 * nfc_dev_down - turn off the NFC device
79 *
80 * @dev: The nfc device to be turned off
81 */
82int nfc_dev_down(struct nfc_dev *dev)
83{
84 int rc = 0;
85
86 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
87
88 device_lock(&dev->dev);
89
90 if (!device_is_registered(&dev->dev)) {
91 rc = -ENODEV;
92 goto error;
93 }
94
95 if (!dev->dev_up) {
96 rc = -EALREADY;
97 goto error;
98 }
99
100 if (dev->polling || dev->active_target) {
101 rc = -EBUSY;
102 goto error;
103 }
104
105 if (dev->ops->dev_down)
106 dev->ops->dev_down(dev);
107
108 dev->dev_up = false;
109
110error:
111 device_unlock(&dev->dev);
112 return rc;
113}
114
115/**
116 * nfc_start_poll - start polling for nfc targets
117 *
118 * @dev: The nfc device that must start polling
119 * @protocols: bitset of nfc protocols that must be used for polling
120 *
121 * The device remains polling for targets until a target is found or
122 * the nfc_stop_poll function is called.
123 */
124int nfc_start_poll(struct nfc_dev *dev, u32 protocols)
125{
126 int rc;
127
128 pr_debug("dev_name=%s protocols=0x%x\n",
129 dev_name(&dev->dev), protocols);
130
131 if (!protocols)
132 return -EINVAL;
133
134 device_lock(&dev->dev);
135
136 if (!device_is_registered(&dev->dev)) {
137 rc = -ENODEV;
138 goto error;
139 }
140
141 if (dev->polling) {
142 rc = -EBUSY;
143 goto error;
144 }
145
146 rc = dev->ops->start_poll(dev, protocols);
147 if (!rc)
148 dev->polling = true;
149
150error:
151 device_unlock(&dev->dev);
152 return rc;
153}
154
155/**
156 * nfc_stop_poll - stop polling for nfc targets
157 *
158 * @dev: The nfc device that must stop polling
159 */
160int nfc_stop_poll(struct nfc_dev *dev)
161{
162 int rc = 0;
163
164 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
165
166 device_lock(&dev->dev);
167
168 if (!device_is_registered(&dev->dev)) {
169 rc = -ENODEV;
170 goto error;
171 }
172
173 if (!dev->polling) {
174 rc = -EINVAL;
175 goto error;
176 }
177
178 dev->ops->stop_poll(dev);
179 dev->polling = false;
180
181error:
182 device_unlock(&dev->dev);
183 return rc;
184}
185
186static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx)
187{
188 int i;
189
190 if (dev->n_targets == 0)
191 return NULL;
192
193 for (i = 0; i < dev->n_targets ; i++) {
194 if (dev->targets[i].idx == target_idx)
195 return &dev->targets[i];
196 }
197
198 return NULL;
199}
200
201int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode)
202{
203 int rc = 0;
204 u8 *gb;
205 size_t gb_len;
206 struct nfc_target *target;
207
208 pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode);
209
210 if (!dev->ops->dep_link_up)
211 return -EOPNOTSUPP;
212
213 device_lock(&dev->dev);
214
215 if (!device_is_registered(&dev->dev)) {
216 rc = -ENODEV;
217 goto error;
218 }
219
220 if (dev->dep_link_up == true) {
221 rc = -EALREADY;
222 goto error;
223 }
224
225 gb = nfc_llcp_general_bytes(dev, &gb_len);
226 if (gb_len > NFC_MAX_GT_LEN) {
227 rc = -EINVAL;
228 goto error;
229 }
230
231 target = nfc_find_target(dev, target_index);
232 if (target == NULL) {
233 rc = -ENOTCONN;
234 goto error;
235 }
236
237 rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len);
238 if (!rc)
239 dev->active_target = target;
240
241error:
242 device_unlock(&dev->dev);
243 return rc;
244}
245
246int nfc_dep_link_down(struct nfc_dev *dev)
247{
248 int rc = 0;
249
250 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
251
252 if (!dev->ops->dep_link_down)
253 return -EOPNOTSUPP;
254
255 device_lock(&dev->dev);
256
257 if (!device_is_registered(&dev->dev)) {
258 rc = -ENODEV;
259 goto error;
260 }
261
262 if (dev->dep_link_up == false) {
263 rc = -EALREADY;
264 goto error;
265 }
266
267 if (dev->dep_rf_mode == NFC_RF_TARGET) {
268 rc = -EOPNOTSUPP;
269 goto error;
270 }
271
272 rc = dev->ops->dep_link_down(dev);
273 if (!rc) {
274 dev->dep_link_up = false;
275 dev->active_target = NULL;
276 nfc_llcp_mac_is_down(dev);
277 nfc_genl_dep_link_down_event(dev);
278 }
279
280error:
281 device_unlock(&dev->dev);
282 return rc;
283}
284
285int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
286 u8 comm_mode, u8 rf_mode)
287{
288 dev->dep_link_up = true;
289 dev->dep_rf_mode = rf_mode;
290
291 nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode);
292
293 return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode);
294}
295EXPORT_SYMBOL(nfc_dep_link_is_up);
296
297/**
298 * nfc_activate_target - prepare the target for data exchange
299 *
300 * @dev: The nfc device that found the target
301 * @target_idx: index of the target that must be activated
302 * @protocol: nfc protocol that will be used for data exchange
303 */
304int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
305{
306 int rc;
307 struct nfc_target *target;
308
309 pr_debug("dev_name=%s target_idx=%u protocol=%u\n",
310 dev_name(&dev->dev), target_idx, protocol);
311
312 device_lock(&dev->dev);
313
314 if (!device_is_registered(&dev->dev)) {
315 rc = -ENODEV;
316 goto error;
317 }
318
319 if (dev->active_target) {
320 rc = -EBUSY;
321 goto error;
322 }
323
324 target = nfc_find_target(dev, target_idx);
325 if (target == NULL) {
326 rc = -ENOTCONN;
327 goto error;
328 }
329
330 rc = dev->ops->activate_target(dev, target, protocol);
331 if (!rc) {
332 dev->active_target = target;
333
334 if (dev->ops->check_presence)
335 mod_timer(&dev->check_pres_timer, jiffies +
336 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
337 }
338
339error:
340 device_unlock(&dev->dev);
341 return rc;
342}
343
344/**
345 * nfc_deactivate_target - deactivate a nfc target
346 *
347 * @dev: The nfc device that found the target
348 * @target_idx: index of the target that must be deactivated
349 */
350int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx)
351{
352 int rc = 0;
353
354 pr_debug("dev_name=%s target_idx=%u\n",
355 dev_name(&dev->dev), target_idx);
356
357 device_lock(&dev->dev);
358
359 if (!device_is_registered(&dev->dev)) {
360 rc = -ENODEV;
361 goto error;
362 }
363
364 if (dev->active_target == NULL) {
365 rc = -ENOTCONN;
366 goto error;
367 }
368
369 if (dev->active_target->idx != target_idx) {
370 rc = -ENOTCONN;
371 goto error;
372 }
373
374 if (dev->ops->check_presence)
375 del_timer_sync(&dev->check_pres_timer);
376
377 dev->ops->deactivate_target(dev, dev->active_target);
378 dev->active_target = NULL;
379
380error:
381 device_unlock(&dev->dev);
382 return rc;
383}
384
385/**
386 * nfc_data_exchange - transceive data
387 *
388 * @dev: The nfc device that found the target
389 * @target_idx: index of the target
390 * @skb: data to be sent
391 * @cb: callback called when the response is received
392 * @cb_context: parameter for the callback function
393 *
394 * The user must wait for the callback before calling this function again.
395 */
396int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb,
397 data_exchange_cb_t cb, void *cb_context)
398{
399 int rc;
400
401 pr_debug("dev_name=%s target_idx=%u skb->len=%u\n",
402 dev_name(&dev->dev), target_idx, skb->len);
403
404 device_lock(&dev->dev);
405
406 if (!device_is_registered(&dev->dev)) {
407 rc = -ENODEV;
408 kfree_skb(skb);
409 goto error;
410 }
411
412 if (dev->active_target == NULL) {
413 rc = -ENOTCONN;
414 kfree_skb(skb);
415 goto error;
416 }
417
418 if (dev->active_target->idx != target_idx) {
419 rc = -EADDRNOTAVAIL;
420 kfree_skb(skb);
421 goto error;
422 }
423
424 if (dev->ops->check_presence)
425 del_timer_sync(&dev->check_pres_timer);
426
427 rc = dev->ops->data_exchange(dev, dev->active_target, skb, cb,
428 cb_context);
429
430 if (!rc && dev->ops->check_presence)
431 mod_timer(&dev->check_pres_timer, jiffies +
432 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
433
434error:
435 device_unlock(&dev->dev);
436 return rc;
437}
438
439int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
440{
441 pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len);
442
443 if (gb_len > NFC_MAX_GT_LEN)
444 return -EINVAL;
445
446 return nfc_llcp_set_remote_gb(dev, gb, gb_len);
447}
448EXPORT_SYMBOL(nfc_set_remote_general_bytes);
449
450/**
451 * nfc_alloc_send_skb - allocate a skb for data exchange responses
452 *
453 * @size: size to allocate
454 * @gfp: gfp flags
455 */
456struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
457 unsigned int flags, unsigned int size,
458 unsigned int *err)
459{
460 struct sk_buff *skb;
461 unsigned int total_size;
462
463 total_size = size +
464 dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
465
466 skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err);
467 if (skb)
468 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
469
470 return skb;
471}
472
473/**
474 * nfc_alloc_recv_skb - allocate a skb for data exchange responses
475 *
476 * @size: size to allocate
477 * @gfp: gfp flags
478 */
479struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp)
480{
481 struct sk_buff *skb;
482 unsigned int total_size;
483
484 total_size = size + 1;
485 skb = alloc_skb(total_size, gfp);
486
487 if (skb)
488 skb_reserve(skb, 1);
489
490 return skb;
491}
492EXPORT_SYMBOL(nfc_alloc_recv_skb);
493
494/**
495 * nfc_targets_found - inform that targets were found
496 *
497 * @dev: The nfc device that found the targets
498 * @targets: array of nfc targets found
499 * @ntargets: targets array size
500 *
501 * The device driver must call this function when one or many nfc targets
502 * are found. After calling this function, the device driver must stop
503 * polling for targets.
504 * IMPORTANT: this function must not be called from an atomic context.
505 * In addition, it must also not be called from a context that would prevent
506 * the NFC Core to call other nfc ops entry point concurrently.
507 */
508int nfc_targets_found(struct nfc_dev *dev,
509 struct nfc_target *targets, int n_targets)
510{
511 int i;
512
513 pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets);
514
515 dev->polling = false;
516
517 for (i = 0; i < n_targets; i++)
518 targets[i].idx = dev->target_next_idx++;
519
520 device_lock(&dev->dev);
521
522 dev->targets_generation++;
523
524 kfree(dev->targets);
525 dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target),
526 GFP_ATOMIC);
527
528 if (!dev->targets) {
529 dev->n_targets = 0;
530 device_unlock(&dev->dev);
531 return -ENOMEM;
532 }
533
534 dev->n_targets = n_targets;
535 device_unlock(&dev->dev);
536
537 nfc_genl_targets_found(dev);
538
539 return 0;
540}
541EXPORT_SYMBOL(nfc_targets_found);
542
543/**
544 * nfc_target_lost - inform that an activated target went out of field
545 *
546 * @dev: The nfc device that had the activated target in field
547 * @target_idx: the nfc index of the target
548 *
549 * The device driver must call this function when the activated target
550 * goes out of the field.
551 * IMPORTANT: this function must not be called from an atomic context.
552 * In addition, it must also not be called from a context that would prevent
553 * the NFC Core to call other nfc ops entry point concurrently.
554 */
555int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
556{
557 struct nfc_target *tg;
558 int i;
559
560 pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx);
561
562 device_lock(&dev->dev);
563
564 for (i = 0; i < dev->n_targets; i++) {
565 tg = &dev->targets[i];
566 if (tg->idx == target_idx)
567 break;
568 }
569
570 if (i == dev->n_targets) {
571 device_unlock(&dev->dev);
572 return -EINVAL;
573 }
574
575 dev->targets_generation++;
576 dev->n_targets--;
577 dev->active_target = NULL;
578
579 if (dev->n_targets) {
580 memcpy(&dev->targets[i], &dev->targets[i + 1],
581 (dev->n_targets - i) * sizeof(struct nfc_target));
582 } else {
583 kfree(dev->targets);
584 dev->targets = NULL;
585 }
586
587 device_unlock(&dev->dev);
588
589 nfc_genl_target_lost(dev, target_idx);
590
591 return 0;
592}
593EXPORT_SYMBOL(nfc_target_lost);
594
595static void nfc_release(struct device *d)
596{
597 struct nfc_dev *dev = to_nfc_dev(d);
598
599 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
600
601 if (dev->ops->check_presence) {
602 del_timer_sync(&dev->check_pres_timer);
603 destroy_workqueue(dev->check_pres_wq);
604 }
605
606 nfc_genl_data_exit(&dev->genl_data);
607 kfree(dev->targets);
608 kfree(dev);
609}
610
611static void nfc_check_pres_work(struct work_struct *work)
612{
613 struct nfc_dev *dev = container_of(work, struct nfc_dev,
614 check_pres_work);
615 int rc;
616
617 device_lock(&dev->dev);
618
619 if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) {
620 rc = dev->ops->check_presence(dev, dev->active_target);
621 if (!rc) {
622 mod_timer(&dev->check_pres_timer, jiffies +
623 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
624 } else {
625 u32 active_target_idx = dev->active_target->idx;
626 device_unlock(&dev->dev);
627 nfc_target_lost(dev, active_target_idx);
628 return;
629 }
630 }
631
632 device_unlock(&dev->dev);
633}
634
635static void nfc_check_pres_timeout(unsigned long data)
636{
637 struct nfc_dev *dev = (struct nfc_dev *)data;
638
639 queue_work(dev->check_pres_wq, &dev->check_pres_work);
640}
641
642struct class nfc_class = {
643 .name = "nfc",
644 .dev_release = nfc_release,
645};
646EXPORT_SYMBOL(nfc_class);
647
648static int match_idx(struct device *d, void *data)
649{
650 struct nfc_dev *dev = to_nfc_dev(d);
651 unsigned int *idx = data;
652
653 return dev->idx == *idx;
654}
655
656struct nfc_dev *nfc_get_device(unsigned int idx)
657{
658 struct device *d;
659
660 d = class_find_device(&nfc_class, NULL, &idx, match_idx);
661 if (!d)
662 return NULL;
663
664 return to_nfc_dev(d);
665}
666
667/**
668 * nfc_allocate_device - allocate a new nfc device
669 *
670 * @ops: device operations
671 * @supported_protocols: NFC protocols supported by the device
672 */
673struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
674 u32 supported_protocols,
675 int tx_headroom, int tx_tailroom)
676{
677 static atomic_t dev_no = ATOMIC_INIT(0);
678 struct nfc_dev *dev;
679
680 if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
681 !ops->deactivate_target || !ops->data_exchange)
682 return NULL;
683
684 if (!supported_protocols)
685 return NULL;
686
687 dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL);
688 if (!dev)
689 return NULL;
690
691 dev->dev.class = &nfc_class;
692 dev->idx = atomic_inc_return(&dev_no) - 1;
693 dev_set_name(&dev->dev, "nfc%d", dev->idx);
694 device_initialize(&dev->dev);
695
696 dev->ops = ops;
697 dev->supported_protocols = supported_protocols;
698 dev->tx_headroom = tx_headroom;
699 dev->tx_tailroom = tx_tailroom;
700
701 nfc_genl_data_init(&dev->genl_data);
702
703
704 /* first generation must not be 0 */
705 dev->targets_generation = 1;
706
707 if (ops->check_presence) {
708 char name[32];
709 init_timer(&dev->check_pres_timer);
710 dev->check_pres_timer.data = (unsigned long)dev;
711 dev->check_pres_timer.function = nfc_check_pres_timeout;
712
713 INIT_WORK(&dev->check_pres_work, nfc_check_pres_work);
714 snprintf(name, sizeof(name), "nfc%d_check_pres_wq", dev->idx);
715 dev->check_pres_wq = alloc_workqueue(name, WQ_NON_REENTRANT |
716 WQ_UNBOUND |
717 WQ_MEM_RECLAIM, 1);
718 if (dev->check_pres_wq == NULL) {
719 kfree(dev);
720 return NULL;
721 }
722 }
723
724 return dev;
725}
726EXPORT_SYMBOL(nfc_allocate_device);
727
728/**
729 * nfc_register_device - register a nfc device in the nfc subsystem
730 *
731 * @dev: The nfc device to register
732 */
733int nfc_register_device(struct nfc_dev *dev)
734{
735 int rc;
736
737 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
738
739 mutex_lock(&nfc_devlist_mutex);
740 nfc_devlist_generation++;
741 rc = device_add(&dev->dev);
742 mutex_unlock(&nfc_devlist_mutex);
743
744 if (rc < 0)
745 return rc;
746
747 rc = nfc_llcp_register_device(dev);
748 if (rc)
749 pr_err("Could not register llcp device\n");
750
751 rc = nfc_genl_device_added(dev);
752 if (rc)
753 pr_debug("The userspace won't be notified that the device %s was added\n",
754 dev_name(&dev->dev));
755
756 return 0;
757}
758EXPORT_SYMBOL(nfc_register_device);
759
760/**
761 * nfc_unregister_device - unregister a nfc device in the nfc subsystem
762 *
763 * @dev: The nfc device to unregister
764 */
765void nfc_unregister_device(struct nfc_dev *dev)
766{
767 int rc;
768
769 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
770
771 mutex_lock(&nfc_devlist_mutex);
772 nfc_devlist_generation++;
773
774 /* lock to avoid unregistering a device while an operation
775 is in progress */
776 device_lock(&dev->dev);
777 device_del(&dev->dev);
778 device_unlock(&dev->dev);
779
780 mutex_unlock(&nfc_devlist_mutex);
781
782 nfc_llcp_unregister_device(dev);
783
784 rc = nfc_genl_device_removed(dev);
785 if (rc)
786 pr_debug("The userspace won't be notified that the device %s was removed\n",
787 dev_name(&dev->dev));
788
789}
790EXPORT_SYMBOL(nfc_unregister_device);
791
792static int __init nfc_init(void)
793{
794 int rc;
795
796 pr_info("NFC Core ver %s\n", VERSION);
797
798 rc = class_register(&nfc_class);
799 if (rc)
800 return rc;
801
802 rc = nfc_genl_init();
803 if (rc)
804 goto err_genl;
805
806 /* the first generation must not be 0 */
807 nfc_devlist_generation = 1;
808
809 rc = rawsock_init();
810 if (rc)
811 goto err_rawsock;
812
813 rc = nfc_llcp_init();
814 if (rc)
815 goto err_llcp_sock;
816
817 rc = af_nfc_init();
818 if (rc)
819 goto err_af_nfc;
820
821 return 0;
822
823err_af_nfc:
824 nfc_llcp_exit();
825err_llcp_sock:
826 rawsock_exit();
827err_rawsock:
828 nfc_genl_exit();
829err_genl:
830 class_unregister(&nfc_class);
831 return rc;
832}
833
834static void __exit nfc_exit(void)
835{
836 af_nfc_exit();
837 nfc_llcp_exit();
838 rawsock_exit();
839 nfc_genl_exit();
840 class_unregister(&nfc_class);
841}
842
843subsys_initcall(nfc_init);
844module_exit(nfc_exit);
845
846MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
847MODULE_DESCRIPTION("NFC Core ver " VERSION);
848MODULE_VERSION(VERSION);
849MODULE_LICENSE("GPL");
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)
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);
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
559 struct nfc_se *se;
560 int rc;
561
562 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
563
564 device_lock(&dev->dev);
565
566 if (!device_is_registered(&dev->dev)) {
567 rc = -ENODEV;
568 goto error;
569 }
570
571 if (!dev->dev_up) {
572 rc = -ENODEV;
573 goto error;
574 }
575
576 if (dev->polling) {
577 rc = -EBUSY;
578 goto error;
579 }
580
581 if (!dev->ops->enable_se || !dev->ops->disable_se) {
582 rc = -EOPNOTSUPP;
583 goto error;
584 }
585
586 se = nfc_find_se(dev, se_idx);
587 if (!se) {
588 rc = -EINVAL;
589 goto error;
590 }
591
592 if (se->state == NFC_SE_ENABLED) {
593 rc = -EALREADY;
594 goto error;
595 }
596
597 rc = dev->ops->enable_se(dev, se_idx);
598 if (rc >= 0)
599 se->state = NFC_SE_ENABLED;
600
601error:
602 device_unlock(&dev->dev);
603 return rc;
604}
605
606int nfc_disable_se(struct nfc_dev *dev, u32 se_idx)
607{
608
609 struct nfc_se *se;
610 int rc;
611
612 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
613
614 device_lock(&dev->dev);
615
616 if (!device_is_registered(&dev->dev)) {
617 rc = -ENODEV;
618 goto error;
619 }
620
621 if (!dev->dev_up) {
622 rc = -ENODEV;
623 goto error;
624 }
625
626 if (!dev->ops->enable_se || !dev->ops->disable_se) {
627 rc = -EOPNOTSUPP;
628 goto error;
629 }
630
631 se = nfc_find_se(dev, se_idx);
632 if (!se) {
633 rc = -EINVAL;
634 goto error;
635 }
636
637 if (se->state == NFC_SE_DISABLED) {
638 rc = -EALREADY;
639 goto error;
640 }
641
642 rc = dev->ops->disable_se(dev, se_idx);
643 if (rc >= 0)
644 se->state = NFC_SE_DISABLED;
645
646error:
647 device_unlock(&dev->dev);
648 return rc;
649}
650
651int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
652{
653 pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len);
654
655 return nfc_llcp_set_remote_gb(dev, gb, gb_len);
656}
657EXPORT_SYMBOL(nfc_set_remote_general_bytes);
658
659u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
660{
661 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
662
663 return nfc_llcp_general_bytes(dev, gb_len);
664}
665EXPORT_SYMBOL(nfc_get_local_general_bytes);
666
667int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb)
668{
669 /* Only LLCP target mode for now */
670 if (dev->dep_link_up == false) {
671 kfree_skb(skb);
672 return -ENOLINK;
673 }
674
675 return nfc_llcp_data_received(dev, skb);
676}
677EXPORT_SYMBOL(nfc_tm_data_received);
678
679int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
680 u8 *gb, size_t gb_len)
681{
682 int rc;
683
684 device_lock(&dev->dev);
685
686 dev->polling = false;
687
688 if (gb != NULL) {
689 rc = nfc_set_remote_general_bytes(dev, gb, gb_len);
690 if (rc < 0)
691 goto out;
692 }
693
694 dev->rf_mode = NFC_RF_TARGET;
695
696 if (protocol == NFC_PROTO_NFC_DEP_MASK)
697 nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET);
698
699 rc = nfc_genl_tm_activated(dev, protocol);
700
701out:
702 device_unlock(&dev->dev);
703
704 return rc;
705}
706EXPORT_SYMBOL(nfc_tm_activated);
707
708int nfc_tm_deactivated(struct nfc_dev *dev)
709{
710 dev->dep_link_up = false;
711 dev->rf_mode = NFC_RF_NONE;
712
713 return nfc_genl_tm_deactivated(dev);
714}
715EXPORT_SYMBOL(nfc_tm_deactivated);
716
717/**
718 * nfc_alloc_send_skb - allocate a skb for data exchange responses
719 *
720 * @size: size to allocate
721 * @gfp: gfp flags
722 */
723struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
724 unsigned int flags, unsigned int size,
725 unsigned int *err)
726{
727 struct sk_buff *skb;
728 unsigned int total_size;
729
730 total_size = size +
731 dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
732
733 skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err);
734 if (skb)
735 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
736
737 return skb;
738}
739
740/**
741 * nfc_alloc_recv_skb - allocate a skb for data exchange responses
742 *
743 * @size: size to allocate
744 * @gfp: gfp flags
745 */
746struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp)
747{
748 struct sk_buff *skb;
749 unsigned int total_size;
750
751 total_size = size + 1;
752 skb = alloc_skb(total_size, gfp);
753
754 if (skb)
755 skb_reserve(skb, 1);
756
757 return skb;
758}
759EXPORT_SYMBOL(nfc_alloc_recv_skb);
760
761/**
762 * nfc_targets_found - inform that targets were found
763 *
764 * @dev: The nfc device that found the targets
765 * @targets: array of nfc targets found
766 * @ntargets: targets array size
767 *
768 * The device driver must call this function when one or many nfc targets
769 * are found. After calling this function, the device driver must stop
770 * polling for targets.
771 * NOTE: This function can be called with targets=NULL and n_targets=0 to
772 * notify a driver error, meaning that the polling operation cannot complete.
773 * IMPORTANT: this function must not be called from an atomic context.
774 * In addition, it must also not be called from a context that would prevent
775 * the NFC Core to call other nfc ops entry point concurrently.
776 */
777int nfc_targets_found(struct nfc_dev *dev,
778 struct nfc_target *targets, int n_targets)
779{
780 int i;
781
782 pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets);
783
784 for (i = 0; i < n_targets; i++)
785 targets[i].idx = dev->target_next_idx++;
786
787 device_lock(&dev->dev);
788
789 if (dev->polling == false) {
790 device_unlock(&dev->dev);
791 return 0;
792 }
793
794 dev->polling = false;
795
796 dev->targets_generation++;
797
798 kfree(dev->targets);
799 dev->targets = NULL;
800
801 if (targets) {
802 dev->targets = kmemdup(targets,
803 n_targets * sizeof(struct nfc_target),
804 GFP_ATOMIC);
805
806 if (!dev->targets) {
807 dev->n_targets = 0;
808 device_unlock(&dev->dev);
809 return -ENOMEM;
810 }
811 }
812
813 dev->n_targets = n_targets;
814 device_unlock(&dev->dev);
815
816 nfc_genl_targets_found(dev);
817
818 return 0;
819}
820EXPORT_SYMBOL(nfc_targets_found);
821
822/**
823 * nfc_target_lost - inform that an activated target went out of field
824 *
825 * @dev: The nfc device that had the activated target in field
826 * @target_idx: the nfc index of the target
827 *
828 * The device driver must call this function when the activated target
829 * goes out of the field.
830 * IMPORTANT: this function must not be called from an atomic context.
831 * In addition, it must also not be called from a context that would prevent
832 * the NFC Core to call other nfc ops entry point concurrently.
833 */
834int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
835{
836 struct nfc_target *tg;
837 int i;
838
839 pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx);
840
841 device_lock(&dev->dev);
842
843 for (i = 0; i < dev->n_targets; i++) {
844 tg = &dev->targets[i];
845 if (tg->idx == target_idx)
846 break;
847 }
848
849 if (i == dev->n_targets) {
850 device_unlock(&dev->dev);
851 return -EINVAL;
852 }
853
854 dev->targets_generation++;
855 dev->n_targets--;
856 dev->active_target = NULL;
857
858 if (dev->n_targets) {
859 memcpy(&dev->targets[i], &dev->targets[i + 1],
860 (dev->n_targets - i) * sizeof(struct nfc_target));
861 } else {
862 kfree(dev->targets);
863 dev->targets = NULL;
864 }
865
866 device_unlock(&dev->dev);
867
868 nfc_genl_target_lost(dev, target_idx);
869
870 return 0;
871}
872EXPORT_SYMBOL(nfc_target_lost);
873
874inline void nfc_driver_failure(struct nfc_dev *dev, int err)
875{
876 nfc_targets_found(dev, NULL, 0);
877}
878EXPORT_SYMBOL(nfc_driver_failure);
879
880int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type)
881{
882 struct nfc_se *se;
883 int rc;
884
885 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
886
887 se = nfc_find_se(dev, se_idx);
888 if (se)
889 return -EALREADY;
890
891 se = kzalloc(sizeof(struct nfc_se), GFP_KERNEL);
892 if (!se)
893 return -ENOMEM;
894
895 se->idx = se_idx;
896 se->type = type;
897 se->state = NFC_SE_DISABLED;
898 INIT_LIST_HEAD(&se->list);
899
900 list_add(&se->list, &dev->secure_elements);
901
902 rc = nfc_genl_se_added(dev, se_idx, type);
903 if (rc < 0) {
904 list_del(&se->list);
905 kfree(se);
906
907 return rc;
908 }
909
910 return 0;
911}
912EXPORT_SYMBOL(nfc_add_se);
913
914int nfc_remove_se(struct nfc_dev *dev, u32 se_idx)
915{
916 struct nfc_se *se, *n;
917 int rc;
918
919 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
920
921 list_for_each_entry_safe(se, n, &dev->secure_elements, list)
922 if (se->idx == se_idx) {
923 rc = nfc_genl_se_removed(dev, se_idx);
924 if (rc < 0)
925 return rc;
926
927 list_del(&se->list);
928 kfree(se);
929
930 return 0;
931 }
932
933 return -EINVAL;
934}
935EXPORT_SYMBOL(nfc_remove_se);
936
937static void nfc_release(struct device *d)
938{
939 struct nfc_dev *dev = to_nfc_dev(d);
940 struct nfc_se *se, *n;
941
942 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
943
944 nfc_genl_data_exit(&dev->genl_data);
945 kfree(dev->targets);
946
947 list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
948 nfc_genl_se_removed(dev, se->idx);
949 list_del(&se->list);
950 kfree(se);
951 }
952
953 kfree(dev);
954}
955
956static void nfc_check_pres_work(struct work_struct *work)
957{
958 struct nfc_dev *dev = container_of(work, struct nfc_dev,
959 check_pres_work);
960 int rc;
961
962 device_lock(&dev->dev);
963
964 if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) {
965 rc = dev->ops->check_presence(dev, dev->active_target);
966 if (rc == -EOPNOTSUPP)
967 goto exit;
968 if (rc) {
969 u32 active_target_idx = dev->active_target->idx;
970 device_unlock(&dev->dev);
971 nfc_target_lost(dev, active_target_idx);
972 return;
973 }
974
975 if (!dev->shutting_down)
976 mod_timer(&dev->check_pres_timer, jiffies +
977 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
978 }
979
980exit:
981 device_unlock(&dev->dev);
982}
983
984static void nfc_check_pres_timeout(unsigned long data)
985{
986 struct nfc_dev *dev = (struct nfc_dev *)data;
987
988 schedule_work(&dev->check_pres_work);
989}
990
991struct class nfc_class = {
992 .name = "nfc",
993 .dev_release = nfc_release,
994};
995EXPORT_SYMBOL(nfc_class);
996
997static int match_idx(struct device *d, const void *data)
998{
999 struct nfc_dev *dev = to_nfc_dev(d);
1000 const unsigned int *idx = data;
1001
1002 return dev->idx == *idx;
1003}
1004
1005struct nfc_dev *nfc_get_device(unsigned int idx)
1006{
1007 struct device *d;
1008
1009 d = class_find_device(&nfc_class, NULL, &idx, match_idx);
1010 if (!d)
1011 return NULL;
1012
1013 return to_nfc_dev(d);
1014}
1015
1016/**
1017 * nfc_allocate_device - allocate a new nfc device
1018 *
1019 * @ops: device operations
1020 * @supported_protocols: NFC protocols supported by the device
1021 */
1022struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
1023 u32 supported_protocols,
1024 int tx_headroom, int tx_tailroom)
1025{
1026 struct nfc_dev *dev;
1027
1028 if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
1029 !ops->deactivate_target || !ops->im_transceive)
1030 return NULL;
1031
1032 if (!supported_protocols)
1033 return NULL;
1034
1035 dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL);
1036 if (!dev)
1037 return NULL;
1038
1039 dev->ops = ops;
1040 dev->supported_protocols = supported_protocols;
1041 dev->tx_headroom = tx_headroom;
1042 dev->tx_tailroom = tx_tailroom;
1043 INIT_LIST_HEAD(&dev->secure_elements);
1044
1045 nfc_genl_data_init(&dev->genl_data);
1046
1047 dev->rf_mode = NFC_RF_NONE;
1048
1049 /* first generation must not be 0 */
1050 dev->targets_generation = 1;
1051
1052 if (ops->check_presence) {
1053 init_timer(&dev->check_pres_timer);
1054 dev->check_pres_timer.data = (unsigned long)dev;
1055 dev->check_pres_timer.function = nfc_check_pres_timeout;
1056
1057 INIT_WORK(&dev->check_pres_work, nfc_check_pres_work);
1058 }
1059
1060 return dev;
1061}
1062EXPORT_SYMBOL(nfc_allocate_device);
1063
1064/**
1065 * nfc_register_device - register a nfc device in the nfc subsystem
1066 *
1067 * @dev: The nfc device to register
1068 */
1069int nfc_register_device(struct nfc_dev *dev)
1070{
1071 int rc;
1072
1073 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
1074
1075 dev->idx = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL);
1076 if (dev->idx < 0)
1077 return dev->idx;
1078
1079 dev->dev.class = &nfc_class;
1080 dev_set_name(&dev->dev, "nfc%d", dev->idx);
1081 device_initialize(&dev->dev);
1082
1083 mutex_lock(&nfc_devlist_mutex);
1084 nfc_devlist_generation++;
1085 rc = device_add(&dev->dev);
1086 mutex_unlock(&nfc_devlist_mutex);
1087
1088 if (rc < 0)
1089 return rc;
1090
1091 rc = nfc_llcp_register_device(dev);
1092 if (rc)
1093 pr_err("Could not register llcp device\n");
1094
1095 rc = nfc_genl_device_added(dev);
1096 if (rc)
1097 pr_debug("The userspace won't be notified that the device %s was added\n",
1098 dev_name(&dev->dev));
1099
1100 dev->rfkill = rfkill_alloc(dev_name(&dev->dev), &dev->dev,
1101 RFKILL_TYPE_NFC, &nfc_rfkill_ops, dev);
1102 if (dev->rfkill) {
1103 if (rfkill_register(dev->rfkill) < 0) {
1104 rfkill_destroy(dev->rfkill);
1105 dev->rfkill = NULL;
1106 }
1107 }
1108
1109 return 0;
1110}
1111EXPORT_SYMBOL(nfc_register_device);
1112
1113/**
1114 * nfc_unregister_device - unregister a nfc device in the nfc subsystem
1115 *
1116 * @dev: The nfc device to unregister
1117 */
1118void nfc_unregister_device(struct nfc_dev *dev)
1119{
1120 int rc, id;
1121
1122 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
1123
1124 id = dev->idx;
1125
1126 if (dev->rfkill) {
1127 rfkill_unregister(dev->rfkill);
1128 rfkill_destroy(dev->rfkill);
1129 }
1130
1131 if (dev->ops->check_presence) {
1132 device_lock(&dev->dev);
1133 dev->shutting_down = true;
1134 device_unlock(&dev->dev);
1135 del_timer_sync(&dev->check_pres_timer);
1136 cancel_work_sync(&dev->check_pres_work);
1137 }
1138
1139 rc = nfc_genl_device_removed(dev);
1140 if (rc)
1141 pr_debug("The userspace won't be notified that the device %s "
1142 "was removed\n", dev_name(&dev->dev));
1143
1144 nfc_llcp_unregister_device(dev);
1145
1146 mutex_lock(&nfc_devlist_mutex);
1147 nfc_devlist_generation++;
1148 device_del(&dev->dev);
1149 mutex_unlock(&nfc_devlist_mutex);
1150
1151 ida_simple_remove(&nfc_index_ida, id);
1152}
1153EXPORT_SYMBOL(nfc_unregister_device);
1154
1155static int __init nfc_init(void)
1156{
1157 int rc;
1158
1159 pr_info("NFC Core ver %s\n", VERSION);
1160
1161 rc = class_register(&nfc_class);
1162 if (rc)
1163 return rc;
1164
1165 rc = nfc_genl_init();
1166 if (rc)
1167 goto err_genl;
1168
1169 /* the first generation must not be 0 */
1170 nfc_devlist_generation = 1;
1171
1172 rc = rawsock_init();
1173 if (rc)
1174 goto err_rawsock;
1175
1176 rc = nfc_llcp_init();
1177 if (rc)
1178 goto err_llcp_sock;
1179
1180 rc = af_nfc_init();
1181 if (rc)
1182 goto err_af_nfc;
1183
1184 return 0;
1185
1186err_af_nfc:
1187 nfc_llcp_exit();
1188err_llcp_sock:
1189 rawsock_exit();
1190err_rawsock:
1191 nfc_genl_exit();
1192err_genl:
1193 class_unregister(&nfc_class);
1194 return rc;
1195}
1196
1197static void __exit nfc_exit(void)
1198{
1199 af_nfc_exit();
1200 nfc_llcp_exit();
1201 rawsock_exit();
1202 nfc_genl_exit();
1203 class_unregister(&nfc_class);
1204}
1205
1206subsys_initcall(nfc_init);
1207module_exit(nfc_exit);
1208
1209MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
1210MODULE_DESCRIPTION("NFC Core ver " VERSION);
1211MODULE_VERSION(VERSION);
1212MODULE_LICENSE("GPL");
1213MODULE_ALIAS_NETPROTO(PF_NFC);
1214MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME);