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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, u8 mode)
453{
454 int rc = 0;
455
456 pr_debug("dev_name=%s target_idx=%u\n",
457 dev_name(&dev->dev), target_idx);
458
459 device_lock(&dev->dev);
460
461 if (!device_is_registered(&dev->dev)) {
462 rc = -ENODEV;
463 goto error;
464 }
465
466 if (dev->active_target == NULL) {
467 rc = -ENOTCONN;
468 goto error;
469 }
470
471 if (dev->active_target->idx != target_idx) {
472 rc = -ENOTCONN;
473 goto error;
474 }
475
476 if (dev->ops->check_presence)
477 del_timer_sync(&dev->check_pres_timer);
478
479 dev->ops->deactivate_target(dev, dev->active_target, mode);
480 dev->active_target = NULL;
481
482error:
483 device_unlock(&dev->dev);
484 return rc;
485}
486
487/**
488 * nfc_data_exchange - transceive data
489 *
490 * @dev: The nfc device that found the target
491 * @target_idx: index of the target
492 * @skb: data to be sent
493 * @cb: callback called when the response is received
494 * @cb_context: parameter for the callback function
495 *
496 * The user must wait for the callback before calling this function again.
497 */
498int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb,
499 data_exchange_cb_t cb, void *cb_context)
500{
501 int rc;
502
503 pr_debug("dev_name=%s target_idx=%u skb->len=%u\n",
504 dev_name(&dev->dev), target_idx, skb->len);
505
506 device_lock(&dev->dev);
507
508 if (!device_is_registered(&dev->dev)) {
509 rc = -ENODEV;
510 kfree_skb(skb);
511 goto error;
512 }
513
514 if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) {
515 if (dev->active_target->idx != target_idx) {
516 rc = -EADDRNOTAVAIL;
517 kfree_skb(skb);
518 goto error;
519 }
520
521 if (dev->ops->check_presence)
522 del_timer_sync(&dev->check_pres_timer);
523
524 rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb,
525 cb_context);
526
527 if (!rc && dev->ops->check_presence && !dev->shutting_down)
528 mod_timer(&dev->check_pres_timer, jiffies +
529 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
530 } else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) {
531 rc = dev->ops->tm_send(dev, skb);
532 } else {
533 rc = -ENOTCONN;
534 kfree_skb(skb);
535 goto error;
536 }
537
538
539error:
540 device_unlock(&dev->dev);
541 return rc;
542}
543
544struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx)
545{
546 struct nfc_se *se;
547
548 list_for_each_entry(se, &dev->secure_elements, list)
549 if (se->idx == se_idx)
550 return se;
551
552 return NULL;
553}
554EXPORT_SYMBOL(nfc_find_se);
555
556int nfc_enable_se(struct nfc_dev *dev, u32 se_idx)
557{
558 struct nfc_se *se;
559 int rc;
560
561 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
562
563 device_lock(&dev->dev);
564
565 if (!device_is_registered(&dev->dev)) {
566 rc = -ENODEV;
567 goto error;
568 }
569
570 if (!dev->dev_up) {
571 rc = -ENODEV;
572 goto error;
573 }
574
575 if (dev->polling) {
576 rc = -EBUSY;
577 goto error;
578 }
579
580 if (!dev->ops->enable_se || !dev->ops->disable_se) {
581 rc = -EOPNOTSUPP;
582 goto error;
583 }
584
585 se = nfc_find_se(dev, se_idx);
586 if (!se) {
587 rc = -EINVAL;
588 goto error;
589 }
590
591 if (se->state == NFC_SE_ENABLED) {
592 rc = -EALREADY;
593 goto error;
594 }
595
596 rc = dev->ops->enable_se(dev, se_idx);
597 if (rc >= 0)
598 se->state = NFC_SE_ENABLED;
599
600error:
601 device_unlock(&dev->dev);
602 return rc;
603}
604
605int nfc_disable_se(struct nfc_dev *dev, u32 se_idx)
606{
607 struct nfc_se *se;
608 int rc;
609
610 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
611
612 device_lock(&dev->dev);
613
614 if (!device_is_registered(&dev->dev)) {
615 rc = -ENODEV;
616 goto error;
617 }
618
619 if (!dev->dev_up) {
620 rc = -ENODEV;
621 goto error;
622 }
623
624 if (!dev->ops->enable_se || !dev->ops->disable_se) {
625 rc = -EOPNOTSUPP;
626 goto error;
627 }
628
629 se = nfc_find_se(dev, se_idx);
630 if (!se) {
631 rc = -EINVAL;
632 goto error;
633 }
634
635 if (se->state == NFC_SE_DISABLED) {
636 rc = -EALREADY;
637 goto error;
638 }
639
640 rc = dev->ops->disable_se(dev, se_idx);
641 if (rc >= 0)
642 se->state = NFC_SE_DISABLED;
643
644error:
645 device_unlock(&dev->dev);
646 return rc;
647}
648
649int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
650{
651 pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len);
652
653 return nfc_llcp_set_remote_gb(dev, gb, gb_len);
654}
655EXPORT_SYMBOL(nfc_set_remote_general_bytes);
656
657u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
658{
659 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
660
661 return nfc_llcp_general_bytes(dev, gb_len);
662}
663EXPORT_SYMBOL(nfc_get_local_general_bytes);
664
665int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb)
666{
667 /* Only LLCP target mode for now */
668 if (dev->dep_link_up == false) {
669 kfree_skb(skb);
670 return -ENOLINK;
671 }
672
673 return nfc_llcp_data_received(dev, skb);
674}
675EXPORT_SYMBOL(nfc_tm_data_received);
676
677int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
678 u8 *gb, size_t gb_len)
679{
680 int rc;
681
682 device_lock(&dev->dev);
683
684 dev->polling = false;
685
686 if (gb != NULL) {
687 rc = nfc_set_remote_general_bytes(dev, gb, gb_len);
688 if (rc < 0)
689 goto out;
690 }
691
692 dev->rf_mode = NFC_RF_TARGET;
693
694 if (protocol == NFC_PROTO_NFC_DEP_MASK)
695 nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET);
696
697 rc = nfc_genl_tm_activated(dev, protocol);
698
699out:
700 device_unlock(&dev->dev);
701
702 return rc;
703}
704EXPORT_SYMBOL(nfc_tm_activated);
705
706int nfc_tm_deactivated(struct nfc_dev *dev)
707{
708 dev->dep_link_up = false;
709 dev->rf_mode = NFC_RF_NONE;
710
711 return nfc_genl_tm_deactivated(dev);
712}
713EXPORT_SYMBOL(nfc_tm_deactivated);
714
715/**
716 * nfc_alloc_send_skb - allocate a skb for data exchange responses
717 *
718 * @size: size to allocate
719 * @gfp: gfp flags
720 */
721struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
722 unsigned int flags, unsigned int size,
723 unsigned int *err)
724{
725 struct sk_buff *skb;
726 unsigned int total_size;
727
728 total_size = size +
729 dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
730
731 skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err);
732 if (skb)
733 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
734
735 return skb;
736}
737
738/**
739 * nfc_alloc_recv_skb - allocate a skb for data exchange responses
740 *
741 * @size: size to allocate
742 * @gfp: gfp flags
743 */
744struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp)
745{
746 struct sk_buff *skb;
747 unsigned int total_size;
748
749 total_size = size + 1;
750 skb = alloc_skb(total_size, gfp);
751
752 if (skb)
753 skb_reserve(skb, 1);
754
755 return skb;
756}
757EXPORT_SYMBOL(nfc_alloc_recv_skb);
758
759/**
760 * nfc_targets_found - inform that targets were found
761 *
762 * @dev: The nfc device that found the targets
763 * @targets: array of nfc targets found
764 * @ntargets: targets array size
765 *
766 * The device driver must call this function when one or many nfc targets
767 * are found. After calling this function, the device driver must stop
768 * polling for targets.
769 * NOTE: This function can be called with targets=NULL and n_targets=0 to
770 * notify a driver error, meaning that the polling operation cannot complete.
771 * IMPORTANT: this function must not be called from an atomic context.
772 * In addition, it must also not be called from a context that would prevent
773 * the NFC Core to call other nfc ops entry point concurrently.
774 */
775int nfc_targets_found(struct nfc_dev *dev,
776 struct nfc_target *targets, int n_targets)
777{
778 int i;
779
780 pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets);
781
782 for (i = 0; i < n_targets; i++)
783 targets[i].idx = dev->target_next_idx++;
784
785 device_lock(&dev->dev);
786
787 if (dev->polling == false) {
788 device_unlock(&dev->dev);
789 return 0;
790 }
791
792 dev->polling = false;
793
794 dev->targets_generation++;
795
796 kfree(dev->targets);
797 dev->targets = NULL;
798
799 if (targets) {
800 dev->targets = kmemdup(targets,
801 n_targets * sizeof(struct nfc_target),
802 GFP_ATOMIC);
803
804 if (!dev->targets) {
805 dev->n_targets = 0;
806 device_unlock(&dev->dev);
807 return -ENOMEM;
808 }
809 }
810
811 dev->n_targets = n_targets;
812 device_unlock(&dev->dev);
813
814 nfc_genl_targets_found(dev);
815
816 return 0;
817}
818EXPORT_SYMBOL(nfc_targets_found);
819
820/**
821 * nfc_target_lost - inform that an activated target went out of field
822 *
823 * @dev: The nfc device that had the activated target in field
824 * @target_idx: the nfc index of the target
825 *
826 * The device driver must call this function when the activated target
827 * goes out of the field.
828 * IMPORTANT: this function must not be called from an atomic context.
829 * In addition, it must also not be called from a context that would prevent
830 * the NFC Core to call other nfc ops entry point concurrently.
831 */
832int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
833{
834 struct nfc_target *tg;
835 int i;
836
837 pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx);
838
839 device_lock(&dev->dev);
840
841 for (i = 0; i < dev->n_targets; i++) {
842 tg = &dev->targets[i];
843 if (tg->idx == target_idx)
844 break;
845 }
846
847 if (i == dev->n_targets) {
848 device_unlock(&dev->dev);
849 return -EINVAL;
850 }
851
852 dev->targets_generation++;
853 dev->n_targets--;
854 dev->active_target = NULL;
855
856 if (dev->n_targets) {
857 memcpy(&dev->targets[i], &dev->targets[i + 1],
858 (dev->n_targets - i) * sizeof(struct nfc_target));
859 } else {
860 kfree(dev->targets);
861 dev->targets = NULL;
862 }
863
864 device_unlock(&dev->dev);
865
866 nfc_genl_target_lost(dev, target_idx);
867
868 return 0;
869}
870EXPORT_SYMBOL(nfc_target_lost);
871
872inline void nfc_driver_failure(struct nfc_dev *dev, int err)
873{
874 nfc_targets_found(dev, NULL, 0);
875}
876EXPORT_SYMBOL(nfc_driver_failure);
877
878int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type)
879{
880 struct nfc_se *se;
881 int rc;
882
883 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
884
885 se = nfc_find_se(dev, se_idx);
886 if (se)
887 return -EALREADY;
888
889 se = kzalloc(sizeof(struct nfc_se), GFP_KERNEL);
890 if (!se)
891 return -ENOMEM;
892
893 se->idx = se_idx;
894 se->type = type;
895 se->state = NFC_SE_DISABLED;
896 INIT_LIST_HEAD(&se->list);
897
898 list_add(&se->list, &dev->secure_elements);
899
900 rc = nfc_genl_se_added(dev, se_idx, type);
901 if (rc < 0) {
902 list_del(&se->list);
903 kfree(se);
904
905 return rc;
906 }
907
908 return 0;
909}
910EXPORT_SYMBOL(nfc_add_se);
911
912int nfc_remove_se(struct nfc_dev *dev, u32 se_idx)
913{
914 struct nfc_se *se, *n;
915 int rc;
916
917 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
918
919 list_for_each_entry_safe(se, n, &dev->secure_elements, list)
920 if (se->idx == se_idx) {
921 rc = nfc_genl_se_removed(dev, se_idx);
922 if (rc < 0)
923 return rc;
924
925 list_del(&se->list);
926 kfree(se);
927
928 return 0;
929 }
930
931 return -EINVAL;
932}
933EXPORT_SYMBOL(nfc_remove_se);
934
935int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,
936 struct nfc_evt_transaction *evt_transaction)
937{
938 int rc;
939
940 pr_debug("transaction: %x\n", se_idx);
941
942 device_lock(&dev->dev);
943
944 if (!evt_transaction) {
945 rc = -EPROTO;
946 goto out;
947 }
948
949 rc = nfc_genl_se_transaction(dev, se_idx, evt_transaction);
950out:
951 device_unlock(&dev->dev);
952 return rc;
953}
954EXPORT_SYMBOL(nfc_se_transaction);
955
956int nfc_se_connectivity(struct nfc_dev *dev, u8 se_idx)
957{
958 int rc;
959
960 pr_debug("connectivity: %x\n", se_idx);
961
962 device_lock(&dev->dev);
963 rc = nfc_genl_se_connectivity(dev, se_idx);
964 device_unlock(&dev->dev);
965 return rc;
966}
967EXPORT_SYMBOL(nfc_se_connectivity);
968
969static void nfc_release(struct device *d)
970{
971 struct nfc_dev *dev = to_nfc_dev(d);
972 struct nfc_se *se, *n;
973
974 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
975
976 nfc_genl_data_exit(&dev->genl_data);
977 kfree(dev->targets);
978
979 list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
980 nfc_genl_se_removed(dev, se->idx);
981 list_del(&se->list);
982 kfree(se);
983 }
984
985 kfree(dev);
986}
987
988static void nfc_check_pres_work(struct work_struct *work)
989{
990 struct nfc_dev *dev = container_of(work, struct nfc_dev,
991 check_pres_work);
992 int rc;
993
994 device_lock(&dev->dev);
995
996 if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) {
997 rc = dev->ops->check_presence(dev, dev->active_target);
998 if (rc == -EOPNOTSUPP)
999 goto exit;
1000 if (rc) {
1001 u32 active_target_idx = dev->active_target->idx;
1002 device_unlock(&dev->dev);
1003 nfc_target_lost(dev, active_target_idx);
1004 return;
1005 }
1006
1007 if (!dev->shutting_down)
1008 mod_timer(&dev->check_pres_timer, jiffies +
1009 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
1010 }
1011
1012exit:
1013 device_unlock(&dev->dev);
1014}
1015
1016static void nfc_check_pres_timeout(unsigned long data)
1017{
1018 struct nfc_dev *dev = (struct nfc_dev *)data;
1019
1020 schedule_work(&dev->check_pres_work);
1021}
1022
1023struct class nfc_class = {
1024 .name = "nfc",
1025 .dev_release = nfc_release,
1026};
1027EXPORT_SYMBOL(nfc_class);
1028
1029static int match_idx(struct device *d, const void *data)
1030{
1031 struct nfc_dev *dev = to_nfc_dev(d);
1032 const unsigned int *idx = data;
1033
1034 return dev->idx == *idx;
1035}
1036
1037struct nfc_dev *nfc_get_device(unsigned int idx)
1038{
1039 struct device *d;
1040
1041 d = class_find_device(&nfc_class, NULL, &idx, match_idx);
1042 if (!d)
1043 return NULL;
1044
1045 return to_nfc_dev(d);
1046}
1047
1048/**
1049 * nfc_allocate_device - allocate a new nfc device
1050 *
1051 * @ops: device operations
1052 * @supported_protocols: NFC protocols supported by the device
1053 */
1054struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
1055 u32 supported_protocols,
1056 int tx_headroom, int tx_tailroom)
1057{
1058 struct nfc_dev *dev;
1059
1060 if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
1061 !ops->deactivate_target || !ops->im_transceive)
1062 return NULL;
1063
1064 if (!supported_protocols)
1065 return NULL;
1066
1067 dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL);
1068 if (!dev)
1069 return NULL;
1070
1071 dev->ops = ops;
1072 dev->supported_protocols = supported_protocols;
1073 dev->tx_headroom = tx_headroom;
1074 dev->tx_tailroom = tx_tailroom;
1075 INIT_LIST_HEAD(&dev->secure_elements);
1076
1077 nfc_genl_data_init(&dev->genl_data);
1078
1079 dev->rf_mode = NFC_RF_NONE;
1080
1081 /* first generation must not be 0 */
1082 dev->targets_generation = 1;
1083
1084 if (ops->check_presence) {
1085 init_timer(&dev->check_pres_timer);
1086 dev->check_pres_timer.data = (unsigned long)dev;
1087 dev->check_pres_timer.function = nfc_check_pres_timeout;
1088
1089 INIT_WORK(&dev->check_pres_work, nfc_check_pres_work);
1090 }
1091
1092 return dev;
1093}
1094EXPORT_SYMBOL(nfc_allocate_device);
1095
1096/**
1097 * nfc_register_device - register a nfc device in the nfc subsystem
1098 *
1099 * @dev: The nfc device to register
1100 */
1101int nfc_register_device(struct nfc_dev *dev)
1102{
1103 int rc;
1104
1105 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
1106
1107 dev->idx = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL);
1108 if (dev->idx < 0)
1109 return dev->idx;
1110
1111 dev->dev.class = &nfc_class;
1112 dev_set_name(&dev->dev, "nfc%d", dev->idx);
1113 device_initialize(&dev->dev);
1114
1115 mutex_lock(&nfc_devlist_mutex);
1116 nfc_devlist_generation++;
1117 rc = device_add(&dev->dev);
1118 mutex_unlock(&nfc_devlist_mutex);
1119
1120 if (rc < 0)
1121 return rc;
1122
1123 rc = nfc_llcp_register_device(dev);
1124 if (rc)
1125 pr_err("Could not register llcp device\n");
1126
1127 rc = nfc_genl_device_added(dev);
1128 if (rc)
1129 pr_debug("The userspace won't be notified that the device %s was added\n",
1130 dev_name(&dev->dev));
1131
1132 dev->rfkill = rfkill_alloc(dev_name(&dev->dev), &dev->dev,
1133 RFKILL_TYPE_NFC, &nfc_rfkill_ops, dev);
1134 if (dev->rfkill) {
1135 if (rfkill_register(dev->rfkill) < 0) {
1136 rfkill_destroy(dev->rfkill);
1137 dev->rfkill = NULL;
1138 }
1139 }
1140
1141 return 0;
1142}
1143EXPORT_SYMBOL(nfc_register_device);
1144
1145/**
1146 * nfc_unregister_device - unregister a nfc device in the nfc subsystem
1147 *
1148 * @dev: The nfc device to unregister
1149 */
1150void nfc_unregister_device(struct nfc_dev *dev)
1151{
1152 int rc, id;
1153
1154 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
1155
1156 id = dev->idx;
1157
1158 if (dev->rfkill) {
1159 rfkill_unregister(dev->rfkill);
1160 rfkill_destroy(dev->rfkill);
1161 }
1162
1163 if (dev->ops->check_presence) {
1164 device_lock(&dev->dev);
1165 dev->shutting_down = true;
1166 device_unlock(&dev->dev);
1167 del_timer_sync(&dev->check_pres_timer);
1168 cancel_work_sync(&dev->check_pres_work);
1169 }
1170
1171 rc = nfc_genl_device_removed(dev);
1172 if (rc)
1173 pr_debug("The userspace won't be notified that the device %s "
1174 "was removed\n", dev_name(&dev->dev));
1175
1176 nfc_llcp_unregister_device(dev);
1177
1178 mutex_lock(&nfc_devlist_mutex);
1179 nfc_devlist_generation++;
1180 device_del(&dev->dev);
1181 mutex_unlock(&nfc_devlist_mutex);
1182
1183 ida_simple_remove(&nfc_index_ida, id);
1184}
1185EXPORT_SYMBOL(nfc_unregister_device);
1186
1187static int __init nfc_init(void)
1188{
1189 int rc;
1190
1191 pr_info("NFC Core ver %s\n", VERSION);
1192
1193 rc = class_register(&nfc_class);
1194 if (rc)
1195 return rc;
1196
1197 rc = nfc_genl_init();
1198 if (rc)
1199 goto err_genl;
1200
1201 /* the first generation must not be 0 */
1202 nfc_devlist_generation = 1;
1203
1204 rc = rawsock_init();
1205 if (rc)
1206 goto err_rawsock;
1207
1208 rc = nfc_llcp_init();
1209 if (rc)
1210 goto err_llcp_sock;
1211
1212 rc = af_nfc_init();
1213 if (rc)
1214 goto err_af_nfc;
1215
1216 return 0;
1217
1218err_af_nfc:
1219 nfc_llcp_exit();
1220err_llcp_sock:
1221 rawsock_exit();
1222err_rawsock:
1223 nfc_genl_exit();
1224err_genl:
1225 class_unregister(&nfc_class);
1226 return rc;
1227}
1228
1229static void __exit nfc_exit(void)
1230{
1231 af_nfc_exit();
1232 nfc_llcp_exit();
1233 rawsock_exit();
1234 nfc_genl_exit();
1235 class_unregister(&nfc_class);
1236}
1237
1238subsys_initcall(nfc_init);
1239module_exit(nfc_exit);
1240
1241MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
1242MODULE_DESCRIPTION("NFC Core ver " VERSION);
1243MODULE_VERSION(VERSION);
1244MODULE_LICENSE("GPL");
1245MODULE_ALIAS_NETPROTO(PF_NFC);
1246MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME);