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 | ||
144612ca | 98 | if (dev->polling || dev->activated_target_idx != NFC_TARGET_IDX_NONE) { |
8b3fe7b5 IE |
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); | |
144612ca EL |
214 | if (!rc) |
215 | dev->activated_target_idx = target_index; | |
1ed28f61 SO |
216 | |
217 | error: | |
218 | device_unlock(&dev->dev); | |
219 | return rc; | |
220 | } | |
221 | ||
222 | int nfc_dep_link_down(struct nfc_dev *dev) | |
223 | { | |
224 | int rc = 0; | |
225 | ||
226 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); | |
227 | ||
228 | if (!dev->ops->dep_link_down) | |
229 | return -EOPNOTSUPP; | |
230 | ||
231 | device_lock(&dev->dev); | |
232 | ||
233 | if (!device_is_registered(&dev->dev)) { | |
234 | rc = -ENODEV; | |
235 | goto error; | |
236 | } | |
237 | ||
238 | if (dev->dep_link_up == false) { | |
239 | rc = -EALREADY; | |
240 | goto error; | |
241 | } | |
242 | ||
243 | if (dev->dep_rf_mode == NFC_RF_TARGET) { | |
244 | rc = -EOPNOTSUPP; | |
245 | goto error; | |
246 | } | |
247 | ||
248 | rc = dev->ops->dep_link_down(dev); | |
249 | if (!rc) { | |
250 | dev->dep_link_up = false; | |
144612ca | 251 | dev->activated_target_idx = NFC_TARGET_IDX_NONE; |
d646960f | 252 | nfc_llcp_mac_is_down(dev); |
1ed28f61 SO |
253 | nfc_genl_dep_link_down_event(dev); |
254 | } | |
255 | ||
256 | error: | |
257 | device_unlock(&dev->dev); | |
258 | return rc; | |
259 | } | |
260 | ||
261 | int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, | |
0a40acb2 | 262 | u8 comm_mode, u8 rf_mode) |
1ed28f61 SO |
263 | { |
264 | dev->dep_link_up = true; | |
265 | dev->dep_rf_mode = rf_mode; | |
266 | ||
d646960f SO |
267 | nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode); |
268 | ||
1ed28f61 SO |
269 | return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode); |
270 | } | |
271 | EXPORT_SYMBOL(nfc_dep_link_is_up); | |
272 | ||
3e256b8f LRV |
273 | /** |
274 | * nfc_activate_target - prepare the target for data exchange | |
275 | * | |
276 | * @dev: The nfc device that found the target | |
277 | * @target_idx: index of the target that must be activated | |
278 | * @protocol: nfc protocol that will be used for data exchange | |
279 | */ | |
280 | int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol) | |
281 | { | |
282 | int rc; | |
283 | ||
20c239c1 JP |
284 | pr_debug("dev_name=%s target_idx=%u protocol=%u\n", |
285 | dev_name(&dev->dev), target_idx, protocol); | |
3e256b8f LRV |
286 | |
287 | device_lock(&dev->dev); | |
288 | ||
289 | if (!device_is_registered(&dev->dev)) { | |
290 | rc = -ENODEV; | |
291 | goto error; | |
292 | } | |
293 | ||
294 | rc = dev->ops->activate_target(dev, target_idx, protocol); | |
8b3fe7b5 | 295 | if (!rc) |
144612ca | 296 | dev->activated_target_idx = target_idx; |
3e256b8f LRV |
297 | |
298 | error: | |
299 | device_unlock(&dev->dev); | |
300 | return rc; | |
301 | } | |
302 | ||
303 | /** | |
304 | * nfc_deactivate_target - deactivate a nfc target | |
305 | * | |
306 | * @dev: The nfc device that found the target | |
307 | * @target_idx: index of the target that must be deactivated | |
308 | */ | |
309 | int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx) | |
310 | { | |
311 | int rc = 0; | |
312 | ||
20c239c1 JP |
313 | pr_debug("dev_name=%s target_idx=%u\n", |
314 | dev_name(&dev->dev), target_idx); | |
3e256b8f LRV |
315 | |
316 | device_lock(&dev->dev); | |
317 | ||
318 | if (!device_is_registered(&dev->dev)) { | |
319 | rc = -ENODEV; | |
320 | goto error; | |
321 | } | |
322 | ||
323 | dev->ops->deactivate_target(dev, target_idx); | |
144612ca | 324 | dev->activated_target_idx = NFC_TARGET_IDX_NONE; |
3e256b8f LRV |
325 | |
326 | error: | |
327 | device_unlock(&dev->dev); | |
328 | return rc; | |
329 | } | |
330 | ||
331 | /** | |
332 | * nfc_data_exchange - transceive data | |
333 | * | |
334 | * @dev: The nfc device that found the target | |
335 | * @target_idx: index of the target | |
336 | * @skb: data to be sent | |
337 | * @cb: callback called when the response is received | |
338 | * @cb_context: parameter for the callback function | |
339 | * | |
340 | * The user must wait for the callback before calling this function again. | |
341 | */ | |
0a40acb2 SO |
342 | int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb, |
343 | data_exchange_cb_t cb, void *cb_context) | |
3e256b8f LRV |
344 | { |
345 | int rc; | |
346 | ||
20c239c1 JP |
347 | pr_debug("dev_name=%s target_idx=%u skb->len=%u\n", |
348 | dev_name(&dev->dev), target_idx, skb->len); | |
3e256b8f LRV |
349 | |
350 | device_lock(&dev->dev); | |
351 | ||
352 | if (!device_is_registered(&dev->dev)) { | |
353 | rc = -ENODEV; | |
354 | kfree_skb(skb); | |
355 | goto error; | |
356 | } | |
357 | ||
144612ca EL |
358 | if (dev->activated_target_idx == NFC_TARGET_IDX_NONE) { |
359 | rc = -ENOTCONN; | |
360 | kfree_skb(skb); | |
361 | goto error; | |
362 | } | |
363 | ||
364 | if (target_idx != dev->activated_target_idx) { | |
365 | rc = -EADDRNOTAVAIL; | |
366 | kfree_skb(skb); | |
367 | goto error; | |
368 | } | |
369 | ||
3e256b8f LRV |
370 | rc = dev->ops->data_exchange(dev, target_idx, skb, cb, cb_context); |
371 | ||
372 | error: | |
373 | device_unlock(&dev->dev); | |
374 | return rc; | |
375 | } | |
376 | ||
541d920b SO |
377 | int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len) |
378 | { | |
0a40acb2 | 379 | pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len); |
541d920b SO |
380 | |
381 | if (gb_len > NFC_MAX_GT_LEN) | |
382 | return -EINVAL; | |
383 | ||
d646960f | 384 | return nfc_llcp_set_remote_gb(dev, gb, gb_len); |
541d920b SO |
385 | } |
386 | EXPORT_SYMBOL(nfc_set_remote_general_bytes); | |
387 | ||
3e256b8f | 388 | /** |
7c7cd3bf | 389 | * nfc_alloc_send_skb - allocate a skb for data exchange responses |
3e256b8f LRV |
390 | * |
391 | * @size: size to allocate | |
392 | * @gfp: gfp flags | |
393 | */ | |
7c7cd3bf | 394 | struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk, |
0a40acb2 SO |
395 | unsigned int flags, unsigned int size, |
396 | unsigned int *err) | |
7c7cd3bf SO |
397 | { |
398 | struct sk_buff *skb; | |
399 | unsigned int total_size; | |
400 | ||
401 | total_size = size + | |
402 | dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
403 | ||
404 | skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err); | |
405 | if (skb) | |
406 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
407 | ||
408 | return skb; | |
409 | } | |
410 | ||
411 | /** | |
412 | * nfc_alloc_recv_skb - allocate a skb for data exchange responses | |
413 | * | |
414 | * @size: size to allocate | |
415 | * @gfp: gfp flags | |
416 | */ | |
417 | struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp) | |
3e256b8f LRV |
418 | { |
419 | struct sk_buff *skb; | |
420 | unsigned int total_size; | |
421 | ||
422 | total_size = size + 1; | |
423 | skb = alloc_skb(total_size, gfp); | |
424 | ||
425 | if (skb) | |
426 | skb_reserve(skb, 1); | |
427 | ||
428 | return skb; | |
429 | } | |
7c7cd3bf | 430 | EXPORT_SYMBOL(nfc_alloc_recv_skb); |
3e256b8f | 431 | |
4d12b8b1 LRV |
432 | /** |
433 | * nfc_targets_found - inform that targets were found | |
434 | * | |
435 | * @dev: The nfc device that found the targets | |
436 | * @targets: array of nfc targets found | |
437 | * @ntargets: targets array size | |
438 | * | |
439 | * The device driver must call this function when one or many nfc targets | |
440 | * are found. After calling this function, the device driver must stop | |
441 | * polling for targets. | |
442 | */ | |
0a40acb2 SO |
443 | int nfc_targets_found(struct nfc_dev *dev, |
444 | struct nfc_target *targets, int n_targets) | |
4d12b8b1 | 445 | { |
c4fbb651 SO |
446 | int i; |
447 | ||
20c239c1 | 448 | pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets); |
4d12b8b1 LRV |
449 | |
450 | dev->polling = false; | |
451 | ||
c4fbb651 | 452 | for (i = 0; i < n_targets; i++) |
01ae0eea | 453 | targets[i].idx = dev->target_next_idx++; |
c4fbb651 | 454 | |
4d12b8b1 LRV |
455 | spin_lock_bh(&dev->targets_lock); |
456 | ||
457 | dev->targets_generation++; | |
458 | ||
459 | kfree(dev->targets); | |
460 | dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target), | |
0a40acb2 | 461 | GFP_ATOMIC); |
4d12b8b1 LRV |
462 | |
463 | if (!dev->targets) { | |
464 | dev->n_targets = 0; | |
465 | spin_unlock_bh(&dev->targets_lock); | |
466 | return -ENOMEM; | |
467 | } | |
468 | ||
469 | dev->n_targets = n_targets; | |
470 | spin_unlock_bh(&dev->targets_lock); | |
471 | ||
472 | nfc_genl_targets_found(dev); | |
473 | ||
474 | return 0; | |
475 | } | |
476 | EXPORT_SYMBOL(nfc_targets_found); | |
477 | ||
e1da0efa EL |
478 | int nfc_target_lost(struct nfc_dev *dev, u32 target_idx) |
479 | { | |
480 | struct nfc_target *tg; | |
481 | int i; | |
482 | ||
483 | pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx); | |
484 | ||
485 | spin_lock_bh(&dev->targets_lock); | |
486 | ||
487 | for (i = 0; i < dev->n_targets; i++) { | |
488 | tg = &dev->targets[i]; | |
489 | if (tg->idx == target_idx) | |
490 | break; | |
491 | } | |
492 | ||
493 | if (i == dev->n_targets) { | |
494 | spin_unlock_bh(&dev->targets_lock); | |
495 | return -EINVAL; | |
496 | } | |
497 | ||
498 | dev->targets_generation++; | |
499 | dev->n_targets--; | |
144612ca | 500 | dev->activated_target_idx = NFC_TARGET_IDX_NONE; |
e1da0efa EL |
501 | |
502 | if (dev->n_targets) { | |
503 | memcpy(&dev->targets[i], &dev->targets[i + 1], | |
504 | (dev->n_targets - i) * sizeof(struct nfc_target)); | |
505 | } else { | |
506 | kfree(dev->targets); | |
507 | dev->targets = NULL; | |
508 | } | |
509 | ||
510 | spin_unlock_bh(&dev->targets_lock); | |
511 | ||
512 | nfc_genl_target_lost(dev, target_idx); | |
513 | ||
514 | return 0; | |
515 | } | |
516 | EXPORT_SYMBOL(nfc_target_lost); | |
517 | ||
3e256b8f LRV |
518 | static void nfc_release(struct device *d) |
519 | { | |
520 | struct nfc_dev *dev = to_nfc_dev(d); | |
521 | ||
20c239c1 | 522 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f | 523 | |
4d12b8b1 LRV |
524 | nfc_genl_data_exit(&dev->genl_data); |
525 | kfree(dev->targets); | |
3e256b8f LRV |
526 | kfree(dev); |
527 | } | |
528 | ||
529 | struct class nfc_class = { | |
530 | .name = "nfc", | |
531 | .dev_release = nfc_release, | |
532 | }; | |
533 | EXPORT_SYMBOL(nfc_class); | |
534 | ||
535 | static int match_idx(struct device *d, void *data) | |
536 | { | |
537 | struct nfc_dev *dev = to_nfc_dev(d); | |
538 | unsigned *idx = data; | |
539 | ||
540 | return dev->idx == *idx; | |
541 | } | |
542 | ||
543 | struct nfc_dev *nfc_get_device(unsigned idx) | |
544 | { | |
545 | struct device *d; | |
546 | ||
547 | d = class_find_device(&nfc_class, NULL, &idx, match_idx); | |
548 | if (!d) | |
549 | return NULL; | |
550 | ||
551 | return to_nfc_dev(d); | |
552 | } | |
553 | ||
554 | /** | |
555 | * nfc_allocate_device - allocate a new nfc device | |
556 | * | |
557 | * @ops: device operations | |
558 | * @supported_protocols: NFC protocols supported by the device | |
559 | */ | |
560 | struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, | |
0a40acb2 SO |
561 | u32 supported_protocols, |
562 | int tx_headroom, int tx_tailroom) | |
3e256b8f LRV |
563 | { |
564 | static atomic_t dev_no = ATOMIC_INIT(0); | |
565 | struct nfc_dev *dev; | |
566 | ||
567 | if (!ops->start_poll || !ops->stop_poll || !ops->activate_target || | |
0a40acb2 | 568 | !ops->deactivate_target || !ops->data_exchange) |
3e256b8f LRV |
569 | return NULL; |
570 | ||
571 | if (!supported_protocols) | |
572 | return NULL; | |
573 | ||
574 | dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL); | |
575 | if (!dev) | |
576 | return NULL; | |
577 | ||
578 | dev->dev.class = &nfc_class; | |
579 | dev->idx = atomic_inc_return(&dev_no) - 1; | |
580 | dev_set_name(&dev->dev, "nfc%d", dev->idx); | |
581 | device_initialize(&dev->dev); | |
582 | ||
583 | dev->ops = ops; | |
584 | dev->supported_protocols = supported_protocols; | |
e8753043 SO |
585 | dev->tx_headroom = tx_headroom; |
586 | dev->tx_tailroom = tx_tailroom; | |
3e256b8f | 587 | |
4d12b8b1 LRV |
588 | spin_lock_init(&dev->targets_lock); |
589 | nfc_genl_data_init(&dev->genl_data); | |
590 | ||
591 | /* first generation must not be 0 */ | |
592 | dev->targets_generation = 1; | |
593 | ||
144612ca EL |
594 | dev->activated_target_idx = NFC_TARGET_IDX_NONE; |
595 | ||
3e256b8f LRV |
596 | return dev; |
597 | } | |
598 | EXPORT_SYMBOL(nfc_allocate_device); | |
599 | ||
600 | /** | |
601 | * nfc_register_device - register a nfc device in the nfc subsystem | |
602 | * | |
603 | * @dev: The nfc device to register | |
604 | */ | |
605 | int nfc_register_device(struct nfc_dev *dev) | |
606 | { | |
607 | int rc; | |
608 | ||
20c239c1 | 609 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
610 | |
611 | mutex_lock(&nfc_devlist_mutex); | |
612 | nfc_devlist_generation++; | |
613 | rc = device_add(&dev->dev); | |
614 | mutex_unlock(&nfc_devlist_mutex); | |
615 | ||
4d12b8b1 LRV |
616 | if (rc < 0) |
617 | return rc; | |
618 | ||
d646960f SO |
619 | rc = nfc_llcp_register_device(dev); |
620 | if (rc) | |
621 | pr_err("Could not register llcp device\n"); | |
622 | ||
4d12b8b1 LRV |
623 | rc = nfc_genl_device_added(dev); |
624 | if (rc) | |
20c239c1 JP |
625 | pr_debug("The userspace won't be notified that the device %s was added\n", |
626 | dev_name(&dev->dev)); | |
4d12b8b1 LRV |
627 | |
628 | return 0; | |
3e256b8f LRV |
629 | } |
630 | EXPORT_SYMBOL(nfc_register_device); | |
631 | ||
632 | /** | |
633 | * nfc_unregister_device - unregister a nfc device in the nfc subsystem | |
634 | * | |
635 | * @dev: The nfc device to unregister | |
636 | */ | |
637 | void nfc_unregister_device(struct nfc_dev *dev) | |
638 | { | |
4d12b8b1 LRV |
639 | int rc; |
640 | ||
20c239c1 | 641 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
642 | |
643 | mutex_lock(&nfc_devlist_mutex); | |
644 | nfc_devlist_generation++; | |
645 | ||
646 | /* lock to avoid unregistering a device while an operation | |
647 | is in progress */ | |
648 | device_lock(&dev->dev); | |
649 | device_del(&dev->dev); | |
650 | device_unlock(&dev->dev); | |
651 | ||
652 | mutex_unlock(&nfc_devlist_mutex); | |
4d12b8b1 | 653 | |
d646960f SO |
654 | nfc_llcp_unregister_device(dev); |
655 | ||
4d12b8b1 LRV |
656 | rc = nfc_genl_device_removed(dev); |
657 | if (rc) | |
20c239c1 JP |
658 | pr_debug("The userspace won't be notified that the device %s was removed\n", |
659 | dev_name(&dev->dev)); | |
4d12b8b1 | 660 | |
3e256b8f LRV |
661 | } |
662 | EXPORT_SYMBOL(nfc_unregister_device); | |
663 | ||
664 | static int __init nfc_init(void) | |
665 | { | |
4d12b8b1 LRV |
666 | int rc; |
667 | ||
ed1e0ad8 | 668 | pr_info("NFC Core ver %s\n", VERSION); |
3e256b8f | 669 | |
4d12b8b1 LRV |
670 | rc = class_register(&nfc_class); |
671 | if (rc) | |
672 | return rc; | |
673 | ||
674 | rc = nfc_genl_init(); | |
675 | if (rc) | |
676 | goto err_genl; | |
677 | ||
678 | /* the first generation must not be 0 */ | |
679 | nfc_devlist_generation = 1; | |
680 | ||
23b7869c LRV |
681 | rc = rawsock_init(); |
682 | if (rc) | |
683 | goto err_rawsock; | |
684 | ||
d646960f SO |
685 | rc = nfc_llcp_init(); |
686 | if (rc) | |
687 | goto err_llcp_sock; | |
688 | ||
c7fe3b52 AAJ |
689 | rc = af_nfc_init(); |
690 | if (rc) | |
691 | goto err_af_nfc; | |
692 | ||
4d12b8b1 LRV |
693 | return 0; |
694 | ||
c7fe3b52 | 695 | err_af_nfc: |
d646960f SO |
696 | nfc_llcp_exit(); |
697 | err_llcp_sock: | |
23b7869c LRV |
698 | rawsock_exit(); |
699 | err_rawsock: | |
c7fe3b52 | 700 | nfc_genl_exit(); |
4d12b8b1 LRV |
701 | err_genl: |
702 | class_unregister(&nfc_class); | |
703 | return rc; | |
3e256b8f LRV |
704 | } |
705 | ||
706 | static void __exit nfc_exit(void) | |
707 | { | |
c7fe3b52 | 708 | af_nfc_exit(); |
d646960f | 709 | nfc_llcp_exit(); |
23b7869c | 710 | rawsock_exit(); |
4d12b8b1 | 711 | nfc_genl_exit(); |
3e256b8f LRV |
712 | class_unregister(&nfc_class); |
713 | } | |
714 | ||
715 | subsys_initcall(nfc_init); | |
716 | module_exit(nfc_exit); | |
717 | ||
718 | MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); | |
719 | MODULE_DESCRIPTION("NFC Core ver " VERSION); | |
720 | MODULE_VERSION(VERSION); | |
721 | MODULE_LICENSE("GPL"); |