Commit | Line | Data |
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3e256b8f LRV |
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 | ||
52858b51 | 24 | #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
ed1e0ad8 | 25 | |
3e256b8f LRV |
26 | #include <linux/init.h> |
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/slab.h> | |
7c7cd3bf | 30 | #include <linux/nfc.h> |
3e256b8f LRV |
31 | |
32 | #include "nfc.h" | |
33 | ||
34 | #define VERSION "0.1" | |
35 | ||
36 | int nfc_devlist_generation; | |
37 | DEFINE_MUTEX(nfc_devlist_mutex); | |
38 | ||
8b3fe7b5 IE |
39 | /** |
40 | * nfc_dev_up - turn on the NFC device | |
41 | * | |
42 | * @dev: The nfc device to be turned on | |
43 | * | |
44 | * The device remains up until the nfc_dev_down function is called. | |
45 | */ | |
46 | int nfc_dev_up(struct nfc_dev *dev) | |
47 | { | |
48 | int rc = 0; | |
49 | ||
20c239c1 | 50 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
8b3fe7b5 IE |
51 | |
52 | device_lock(&dev->dev); | |
53 | ||
54 | if (!device_is_registered(&dev->dev)) { | |
55 | rc = -ENODEV; | |
56 | goto error; | |
57 | } | |
58 | ||
59 | if (dev->dev_up) { | |
60 | rc = -EALREADY; | |
61 | goto error; | |
62 | } | |
63 | ||
64 | if (dev->ops->dev_up) | |
65 | rc = dev->ops->dev_up(dev); | |
66 | ||
67 | if (!rc) | |
68 | dev->dev_up = true; | |
69 | ||
70 | error: | |
71 | device_unlock(&dev->dev); | |
72 | return rc; | |
73 | } | |
74 | ||
75 | /** | |
76 | * nfc_dev_down - turn off the NFC device | |
77 | * | |
78 | * @dev: The nfc device to be turned off | |
79 | */ | |
80 | int nfc_dev_down(struct nfc_dev *dev) | |
81 | { | |
82 | int rc = 0; | |
83 | ||
20c239c1 | 84 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
8b3fe7b5 IE |
85 | |
86 | device_lock(&dev->dev); | |
87 | ||
88 | if (!device_is_registered(&dev->dev)) { | |
89 | rc = -ENODEV; | |
90 | goto error; | |
91 | } | |
92 | ||
93 | if (!dev->dev_up) { | |
94 | rc = -EALREADY; | |
95 | goto error; | |
96 | } | |
97 | ||
98 | if (dev->polling || dev->remote_activated) { | |
99 | rc = -EBUSY; | |
100 | goto error; | |
101 | } | |
102 | ||
103 | if (dev->ops->dev_down) | |
104 | dev->ops->dev_down(dev); | |
105 | ||
106 | dev->dev_up = false; | |
107 | ||
108 | error: | |
109 | device_unlock(&dev->dev); | |
110 | return rc; | |
111 | } | |
112 | ||
3e256b8f LRV |
113 | /** |
114 | * nfc_start_poll - start polling for nfc targets | |
115 | * | |
116 | * @dev: The nfc device that must start polling | |
117 | * @protocols: bitset of nfc protocols that must be used for polling | |
118 | * | |
119 | * The device remains polling for targets until a target is found or | |
120 | * the nfc_stop_poll function is called. | |
121 | */ | |
122 | int nfc_start_poll(struct nfc_dev *dev, u32 protocols) | |
123 | { | |
124 | int rc; | |
125 | ||
20c239c1 JP |
126 | pr_debug("dev_name=%s protocols=0x%x\n", |
127 | dev_name(&dev->dev), protocols); | |
3e256b8f LRV |
128 | |
129 | if (!protocols) | |
130 | return -EINVAL; | |
131 | ||
132 | device_lock(&dev->dev); | |
133 | ||
134 | if (!device_is_registered(&dev->dev)) { | |
135 | rc = -ENODEV; | |
136 | goto error; | |
137 | } | |
138 | ||
139 | if (dev->polling) { | |
140 | rc = -EBUSY; | |
141 | goto error; | |
142 | } | |
143 | ||
144 | rc = dev->ops->start_poll(dev, protocols); | |
145 | if (!rc) | |
146 | dev->polling = true; | |
147 | ||
148 | error: | |
149 | device_unlock(&dev->dev); | |
150 | return rc; | |
151 | } | |
152 | ||
153 | /** | |
154 | * nfc_stop_poll - stop polling for nfc targets | |
155 | * | |
156 | * @dev: The nfc device that must stop polling | |
157 | */ | |
158 | int nfc_stop_poll(struct nfc_dev *dev) | |
159 | { | |
160 | int rc = 0; | |
161 | ||
20c239c1 | 162 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
163 | |
164 | device_lock(&dev->dev); | |
165 | ||
166 | if (!device_is_registered(&dev->dev)) { | |
167 | rc = -ENODEV; | |
168 | goto error; | |
169 | } | |
170 | ||
171 | if (!dev->polling) { | |
172 | rc = -EINVAL; | |
173 | goto error; | |
174 | } | |
175 | ||
176 | dev->ops->stop_poll(dev); | |
177 | dev->polling = false; | |
178 | ||
179 | error: | |
180 | device_unlock(&dev->dev); | |
181 | return rc; | |
182 | } | |
183 | ||
47807d3d | 184 | int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode) |
1ed28f61 SO |
185 | { |
186 | int rc = 0; | |
47807d3d SO |
187 | u8 *gb; |
188 | size_t gb_len; | |
1ed28f61 | 189 | |
47807d3d | 190 | pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode); |
1ed28f61 SO |
191 | |
192 | if (!dev->ops->dep_link_up) | |
193 | return -EOPNOTSUPP; | |
194 | ||
195 | device_lock(&dev->dev); | |
196 | ||
197 | if (!device_is_registered(&dev->dev)) { | |
198 | rc = -ENODEV; | |
199 | goto error; | |
200 | } | |
201 | ||
202 | if (dev->dep_link_up == true) { | |
203 | rc = -EALREADY; | |
204 | goto error; | |
205 | } | |
206 | ||
47807d3d SO |
207 | gb = nfc_llcp_general_bytes(dev, &gb_len); |
208 | if (gb_len > NFC_MAX_GT_LEN) { | |
209 | rc = -EINVAL; | |
210 | goto error; | |
211 | } | |
212 | ||
213 | rc = dev->ops->dep_link_up(dev, target_index, comm_mode, gb, gb_len); | |
1ed28f61 SO |
214 | |
215 | error: | |
216 | device_unlock(&dev->dev); | |
217 | return rc; | |
218 | } | |
219 | ||
220 | int nfc_dep_link_down(struct nfc_dev *dev) | |
221 | { | |
222 | int rc = 0; | |
223 | ||
224 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); | |
225 | ||
226 | if (!dev->ops->dep_link_down) | |
227 | return -EOPNOTSUPP; | |
228 | ||
229 | device_lock(&dev->dev); | |
230 | ||
231 | if (!device_is_registered(&dev->dev)) { | |
232 | rc = -ENODEV; | |
233 | goto error; | |
234 | } | |
235 | ||
236 | if (dev->dep_link_up == false) { | |
237 | rc = -EALREADY; | |
238 | goto error; | |
239 | } | |
240 | ||
241 | if (dev->dep_rf_mode == NFC_RF_TARGET) { | |
242 | rc = -EOPNOTSUPP; | |
243 | goto error; | |
244 | } | |
245 | ||
246 | rc = dev->ops->dep_link_down(dev); | |
247 | if (!rc) { | |
248 | dev->dep_link_up = false; | |
d646960f | 249 | nfc_llcp_mac_is_down(dev); |
1ed28f61 SO |
250 | nfc_genl_dep_link_down_event(dev); |
251 | } | |
252 | ||
253 | error: | |
254 | device_unlock(&dev->dev); | |
255 | return rc; | |
256 | } | |
257 | ||
258 | int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, | |
0a40acb2 | 259 | u8 comm_mode, u8 rf_mode) |
1ed28f61 SO |
260 | { |
261 | dev->dep_link_up = true; | |
262 | dev->dep_rf_mode = rf_mode; | |
263 | ||
d646960f SO |
264 | nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode); |
265 | ||
1ed28f61 SO |
266 | return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode); |
267 | } | |
268 | EXPORT_SYMBOL(nfc_dep_link_is_up); | |
269 | ||
3e256b8f LRV |
270 | /** |
271 | * nfc_activate_target - prepare the target for data exchange | |
272 | * | |
273 | * @dev: The nfc device that found the target | |
274 | * @target_idx: index of the target that must be activated | |
275 | * @protocol: nfc protocol that will be used for data exchange | |
276 | */ | |
277 | int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol) | |
278 | { | |
279 | int rc; | |
280 | ||
20c239c1 JP |
281 | pr_debug("dev_name=%s target_idx=%u protocol=%u\n", |
282 | dev_name(&dev->dev), target_idx, protocol); | |
3e256b8f LRV |
283 | |
284 | device_lock(&dev->dev); | |
285 | ||
286 | if (!device_is_registered(&dev->dev)) { | |
287 | rc = -ENODEV; | |
288 | goto error; | |
289 | } | |
290 | ||
291 | rc = dev->ops->activate_target(dev, target_idx, protocol); | |
8b3fe7b5 IE |
292 | if (!rc) |
293 | dev->remote_activated = true; | |
3e256b8f LRV |
294 | |
295 | error: | |
296 | device_unlock(&dev->dev); | |
297 | return rc; | |
298 | } | |
299 | ||
300 | /** | |
301 | * nfc_deactivate_target - deactivate a nfc target | |
302 | * | |
303 | * @dev: The nfc device that found the target | |
304 | * @target_idx: index of the target that must be deactivated | |
305 | */ | |
306 | int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx) | |
307 | { | |
308 | int rc = 0; | |
309 | ||
20c239c1 JP |
310 | pr_debug("dev_name=%s target_idx=%u\n", |
311 | dev_name(&dev->dev), target_idx); | |
3e256b8f LRV |
312 | |
313 | device_lock(&dev->dev); | |
314 | ||
315 | if (!device_is_registered(&dev->dev)) { | |
316 | rc = -ENODEV; | |
317 | goto error; | |
318 | } | |
319 | ||
320 | dev->ops->deactivate_target(dev, target_idx); | |
8b3fe7b5 | 321 | dev->remote_activated = false; |
3e256b8f LRV |
322 | |
323 | error: | |
324 | device_unlock(&dev->dev); | |
325 | return rc; | |
326 | } | |
327 | ||
328 | /** | |
329 | * nfc_data_exchange - transceive data | |
330 | * | |
331 | * @dev: The nfc device that found the target | |
332 | * @target_idx: index of the target | |
333 | * @skb: data to be sent | |
334 | * @cb: callback called when the response is received | |
335 | * @cb_context: parameter for the callback function | |
336 | * | |
337 | * The user must wait for the callback before calling this function again. | |
338 | */ | |
0a40acb2 SO |
339 | int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb, |
340 | data_exchange_cb_t cb, void *cb_context) | |
3e256b8f LRV |
341 | { |
342 | int rc; | |
343 | ||
20c239c1 JP |
344 | pr_debug("dev_name=%s target_idx=%u skb->len=%u\n", |
345 | dev_name(&dev->dev), target_idx, skb->len); | |
3e256b8f LRV |
346 | |
347 | device_lock(&dev->dev); | |
348 | ||
349 | if (!device_is_registered(&dev->dev)) { | |
350 | rc = -ENODEV; | |
351 | kfree_skb(skb); | |
352 | goto error; | |
353 | } | |
354 | ||
355 | rc = dev->ops->data_exchange(dev, target_idx, skb, cb, cb_context); | |
356 | ||
357 | error: | |
358 | device_unlock(&dev->dev); | |
359 | return rc; | |
360 | } | |
361 | ||
541d920b SO |
362 | int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len) |
363 | { | |
0a40acb2 | 364 | pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len); |
541d920b SO |
365 | |
366 | if (gb_len > NFC_MAX_GT_LEN) | |
367 | return -EINVAL; | |
368 | ||
d646960f | 369 | return nfc_llcp_set_remote_gb(dev, gb, gb_len); |
541d920b SO |
370 | } |
371 | EXPORT_SYMBOL(nfc_set_remote_general_bytes); | |
372 | ||
3e256b8f | 373 | /** |
7c7cd3bf | 374 | * nfc_alloc_send_skb - allocate a skb for data exchange responses |
3e256b8f LRV |
375 | * |
376 | * @size: size to allocate | |
377 | * @gfp: gfp flags | |
378 | */ | |
7c7cd3bf | 379 | struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk, |
0a40acb2 SO |
380 | unsigned int flags, unsigned int size, |
381 | unsigned int *err) | |
7c7cd3bf SO |
382 | { |
383 | struct sk_buff *skb; | |
384 | unsigned int total_size; | |
385 | ||
386 | total_size = size + | |
387 | dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
388 | ||
389 | skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err); | |
390 | if (skb) | |
391 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
392 | ||
393 | return skb; | |
394 | } | |
395 | ||
396 | /** | |
397 | * nfc_alloc_recv_skb - allocate a skb for data exchange responses | |
398 | * | |
399 | * @size: size to allocate | |
400 | * @gfp: gfp flags | |
401 | */ | |
402 | struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp) | |
3e256b8f LRV |
403 | { |
404 | struct sk_buff *skb; | |
405 | unsigned int total_size; | |
406 | ||
407 | total_size = size + 1; | |
408 | skb = alloc_skb(total_size, gfp); | |
409 | ||
410 | if (skb) | |
411 | skb_reserve(skb, 1); | |
412 | ||
413 | return skb; | |
414 | } | |
7c7cd3bf | 415 | EXPORT_SYMBOL(nfc_alloc_recv_skb); |
3e256b8f | 416 | |
4d12b8b1 LRV |
417 | /** |
418 | * nfc_targets_found - inform that targets were found | |
419 | * | |
420 | * @dev: The nfc device that found the targets | |
421 | * @targets: array of nfc targets found | |
422 | * @ntargets: targets array size | |
423 | * | |
424 | * The device driver must call this function when one or many nfc targets | |
425 | * are found. After calling this function, the device driver must stop | |
426 | * polling for targets. | |
427 | */ | |
0a40acb2 SO |
428 | int nfc_targets_found(struct nfc_dev *dev, |
429 | struct nfc_target *targets, int n_targets) | |
4d12b8b1 | 430 | { |
c4fbb651 SO |
431 | int i; |
432 | ||
20c239c1 | 433 | pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets); |
4d12b8b1 LRV |
434 | |
435 | dev->polling = false; | |
436 | ||
c4fbb651 SO |
437 | for (i = 0; i < n_targets; i++) |
438 | targets[i].idx = dev->target_idx++; | |
439 | ||
4d12b8b1 LRV |
440 | spin_lock_bh(&dev->targets_lock); |
441 | ||
442 | dev->targets_generation++; | |
443 | ||
444 | kfree(dev->targets); | |
445 | dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target), | |
0a40acb2 | 446 | GFP_ATOMIC); |
4d12b8b1 LRV |
447 | |
448 | if (!dev->targets) { | |
449 | dev->n_targets = 0; | |
450 | spin_unlock_bh(&dev->targets_lock); | |
451 | return -ENOMEM; | |
452 | } | |
453 | ||
454 | dev->n_targets = n_targets; | |
455 | spin_unlock_bh(&dev->targets_lock); | |
456 | ||
457 | nfc_genl_targets_found(dev); | |
458 | ||
459 | return 0; | |
460 | } | |
461 | EXPORT_SYMBOL(nfc_targets_found); | |
462 | ||
e1da0efa EL |
463 | int nfc_target_lost(struct nfc_dev *dev, u32 target_idx) |
464 | { | |
465 | struct nfc_target *tg; | |
466 | int i; | |
467 | ||
468 | pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx); | |
469 | ||
470 | spin_lock_bh(&dev->targets_lock); | |
471 | ||
472 | for (i = 0; i < dev->n_targets; i++) { | |
473 | tg = &dev->targets[i]; | |
474 | if (tg->idx == target_idx) | |
475 | break; | |
476 | } | |
477 | ||
478 | if (i == dev->n_targets) { | |
479 | spin_unlock_bh(&dev->targets_lock); | |
480 | return -EINVAL; | |
481 | } | |
482 | ||
483 | dev->targets_generation++; | |
484 | dev->n_targets--; | |
485 | ||
486 | if (dev->n_targets) { | |
487 | memcpy(&dev->targets[i], &dev->targets[i + 1], | |
488 | (dev->n_targets - i) * sizeof(struct nfc_target)); | |
489 | } else { | |
490 | kfree(dev->targets); | |
491 | dev->targets = NULL; | |
492 | } | |
493 | ||
494 | spin_unlock_bh(&dev->targets_lock); | |
495 | ||
496 | nfc_genl_target_lost(dev, target_idx); | |
497 | ||
498 | return 0; | |
499 | } | |
500 | EXPORT_SYMBOL(nfc_target_lost); | |
501 | ||
3e256b8f LRV |
502 | static void nfc_release(struct device *d) |
503 | { | |
504 | struct nfc_dev *dev = to_nfc_dev(d); | |
505 | ||
20c239c1 | 506 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f | 507 | |
4d12b8b1 LRV |
508 | nfc_genl_data_exit(&dev->genl_data); |
509 | kfree(dev->targets); | |
3e256b8f LRV |
510 | kfree(dev); |
511 | } | |
512 | ||
513 | struct class nfc_class = { | |
514 | .name = "nfc", | |
515 | .dev_release = nfc_release, | |
516 | }; | |
517 | EXPORT_SYMBOL(nfc_class); | |
518 | ||
519 | static int match_idx(struct device *d, void *data) | |
520 | { | |
521 | struct nfc_dev *dev = to_nfc_dev(d); | |
522 | unsigned *idx = data; | |
523 | ||
524 | return dev->idx == *idx; | |
525 | } | |
526 | ||
527 | struct nfc_dev *nfc_get_device(unsigned idx) | |
528 | { | |
529 | struct device *d; | |
530 | ||
531 | d = class_find_device(&nfc_class, NULL, &idx, match_idx); | |
532 | if (!d) | |
533 | return NULL; | |
534 | ||
535 | return to_nfc_dev(d); | |
536 | } | |
537 | ||
538 | /** | |
539 | * nfc_allocate_device - allocate a new nfc device | |
540 | * | |
541 | * @ops: device operations | |
542 | * @supported_protocols: NFC protocols supported by the device | |
543 | */ | |
544 | struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, | |
0a40acb2 SO |
545 | u32 supported_protocols, |
546 | int tx_headroom, int tx_tailroom) | |
3e256b8f LRV |
547 | { |
548 | static atomic_t dev_no = ATOMIC_INIT(0); | |
549 | struct nfc_dev *dev; | |
550 | ||
551 | if (!ops->start_poll || !ops->stop_poll || !ops->activate_target || | |
0a40acb2 | 552 | !ops->deactivate_target || !ops->data_exchange) |
3e256b8f LRV |
553 | return NULL; |
554 | ||
555 | if (!supported_protocols) | |
556 | return NULL; | |
557 | ||
558 | dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL); | |
559 | if (!dev) | |
560 | return NULL; | |
561 | ||
562 | dev->dev.class = &nfc_class; | |
563 | dev->idx = atomic_inc_return(&dev_no) - 1; | |
564 | dev_set_name(&dev->dev, "nfc%d", dev->idx); | |
565 | device_initialize(&dev->dev); | |
566 | ||
567 | dev->ops = ops; | |
568 | dev->supported_protocols = supported_protocols; | |
e8753043 SO |
569 | dev->tx_headroom = tx_headroom; |
570 | dev->tx_tailroom = tx_tailroom; | |
3e256b8f | 571 | |
4d12b8b1 LRV |
572 | spin_lock_init(&dev->targets_lock); |
573 | nfc_genl_data_init(&dev->genl_data); | |
574 | ||
575 | /* first generation must not be 0 */ | |
576 | dev->targets_generation = 1; | |
577 | ||
3e256b8f LRV |
578 | return dev; |
579 | } | |
580 | EXPORT_SYMBOL(nfc_allocate_device); | |
581 | ||
582 | /** | |
583 | * nfc_register_device - register a nfc device in the nfc subsystem | |
584 | * | |
585 | * @dev: The nfc device to register | |
586 | */ | |
587 | int nfc_register_device(struct nfc_dev *dev) | |
588 | { | |
589 | int rc; | |
590 | ||
20c239c1 | 591 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
592 | |
593 | mutex_lock(&nfc_devlist_mutex); | |
594 | nfc_devlist_generation++; | |
595 | rc = device_add(&dev->dev); | |
596 | mutex_unlock(&nfc_devlist_mutex); | |
597 | ||
4d12b8b1 LRV |
598 | if (rc < 0) |
599 | return rc; | |
600 | ||
d646960f SO |
601 | rc = nfc_llcp_register_device(dev); |
602 | if (rc) | |
603 | pr_err("Could not register llcp device\n"); | |
604 | ||
4d12b8b1 LRV |
605 | rc = nfc_genl_device_added(dev); |
606 | if (rc) | |
20c239c1 JP |
607 | pr_debug("The userspace won't be notified that the device %s was added\n", |
608 | dev_name(&dev->dev)); | |
4d12b8b1 LRV |
609 | |
610 | return 0; | |
3e256b8f LRV |
611 | } |
612 | EXPORT_SYMBOL(nfc_register_device); | |
613 | ||
614 | /** | |
615 | * nfc_unregister_device - unregister a nfc device in the nfc subsystem | |
616 | * | |
617 | * @dev: The nfc device to unregister | |
618 | */ | |
619 | void nfc_unregister_device(struct nfc_dev *dev) | |
620 | { | |
4d12b8b1 LRV |
621 | int rc; |
622 | ||
20c239c1 | 623 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
624 | |
625 | mutex_lock(&nfc_devlist_mutex); | |
626 | nfc_devlist_generation++; | |
627 | ||
628 | /* lock to avoid unregistering a device while an operation | |
629 | is in progress */ | |
630 | device_lock(&dev->dev); | |
631 | device_del(&dev->dev); | |
632 | device_unlock(&dev->dev); | |
633 | ||
634 | mutex_unlock(&nfc_devlist_mutex); | |
4d12b8b1 | 635 | |
d646960f SO |
636 | nfc_llcp_unregister_device(dev); |
637 | ||
4d12b8b1 LRV |
638 | rc = nfc_genl_device_removed(dev); |
639 | if (rc) | |
20c239c1 JP |
640 | pr_debug("The userspace won't be notified that the device %s was removed\n", |
641 | dev_name(&dev->dev)); | |
4d12b8b1 | 642 | |
3e256b8f LRV |
643 | } |
644 | EXPORT_SYMBOL(nfc_unregister_device); | |
645 | ||
646 | static int __init nfc_init(void) | |
647 | { | |
4d12b8b1 LRV |
648 | int rc; |
649 | ||
ed1e0ad8 | 650 | pr_info("NFC Core ver %s\n", VERSION); |
3e256b8f | 651 | |
4d12b8b1 LRV |
652 | rc = class_register(&nfc_class); |
653 | if (rc) | |
654 | return rc; | |
655 | ||
656 | rc = nfc_genl_init(); | |
657 | if (rc) | |
658 | goto err_genl; | |
659 | ||
660 | /* the first generation must not be 0 */ | |
661 | nfc_devlist_generation = 1; | |
662 | ||
23b7869c LRV |
663 | rc = rawsock_init(); |
664 | if (rc) | |
665 | goto err_rawsock; | |
666 | ||
d646960f SO |
667 | rc = nfc_llcp_init(); |
668 | if (rc) | |
669 | goto err_llcp_sock; | |
670 | ||
c7fe3b52 AAJ |
671 | rc = af_nfc_init(); |
672 | if (rc) | |
673 | goto err_af_nfc; | |
674 | ||
4d12b8b1 LRV |
675 | return 0; |
676 | ||
c7fe3b52 | 677 | err_af_nfc: |
d646960f SO |
678 | nfc_llcp_exit(); |
679 | err_llcp_sock: | |
23b7869c LRV |
680 | rawsock_exit(); |
681 | err_rawsock: | |
c7fe3b52 | 682 | nfc_genl_exit(); |
4d12b8b1 LRV |
683 | err_genl: |
684 | class_unregister(&nfc_class); | |
685 | return rc; | |
3e256b8f LRV |
686 | } |
687 | ||
688 | static void __exit nfc_exit(void) | |
689 | { | |
c7fe3b52 | 690 | af_nfc_exit(); |
d646960f | 691 | nfc_llcp_exit(); |
23b7869c | 692 | rawsock_exit(); |
4d12b8b1 | 693 | nfc_genl_exit(); |
3e256b8f LRV |
694 | class_unregister(&nfc_class); |
695 | } | |
696 | ||
697 | subsys_initcall(nfc_init); | |
698 | module_exit(nfc_exit); | |
699 | ||
700 | MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); | |
701 | MODULE_DESCRIPTION("NFC Core ver " VERSION); | |
702 | MODULE_VERSION(VERSION); | |
703 | MODULE_LICENSE("GPL"); |