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