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 | ||
c8d56ae7 EL |
36 | #define NFC_CHECK_PRES_FREQ_MS 2000 |
37 | ||
3e256b8f LRV |
38 | int nfc_devlist_generation; |
39 | DEFINE_MUTEX(nfc_devlist_mutex); | |
40 | ||
8b3fe7b5 IE |
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 | */ | |
48 | int nfc_dev_up(struct nfc_dev *dev) | |
49 | { | |
50 | int rc = 0; | |
51 | ||
20c239c1 | 52 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
8b3fe7b5 IE |
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 | ||
72 | error: | |
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 | */ | |
82 | int nfc_dev_down(struct nfc_dev *dev) | |
83 | { | |
84 | int rc = 0; | |
85 | ||
20c239c1 | 86 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
8b3fe7b5 IE |
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 | ||
90099433 | 100 | if (dev->polling || dev->active_target) { |
8b3fe7b5 IE |
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 | ||
110 | error: | |
111 | device_unlock(&dev->dev); | |
112 | return rc; | |
113 | } | |
114 | ||
3e256b8f LRV |
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 | */ | |
fe7c5800 | 124 | int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols) |
3e256b8f LRV |
125 | { |
126 | int rc; | |
127 | ||
fe7c5800 SO |
128 | pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n", |
129 | dev_name(&dev->dev), im_protocols, tm_protocols); | |
3e256b8f | 130 | |
fe7c5800 | 131 | if (!im_protocols && !tm_protocols) |
3e256b8f LRV |
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 | ||
fe7c5800 | 146 | rc = dev->ops->start_poll(dev, im_protocols, tm_protocols); |
3e256b8f LRV |
147 | if (!rc) |
148 | dev->polling = true; | |
149 | ||
150 | error: | |
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 | */ | |
160 | int nfc_stop_poll(struct nfc_dev *dev) | |
161 | { | |
162 | int rc = 0; | |
163 | ||
20c239c1 | 164 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
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 | ||
181 | error: | |
182 | device_unlock(&dev->dev); | |
183 | return rc; | |
184 | } | |
185 | ||
90099433 EL |
186 | static 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 | ||
47807d3d | 201 | int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode) |
1ed28f61 SO |
202 | { |
203 | int rc = 0; | |
47807d3d SO |
204 | u8 *gb; |
205 | size_t gb_len; | |
90099433 | 206 | struct nfc_target *target; |
1ed28f61 | 207 | |
47807d3d | 208 | pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode); |
1ed28f61 SO |
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 | ||
47807d3d SO |
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 | ||
90099433 EL |
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); | |
144612ca | 238 | if (!rc) |
90099433 | 239 | dev->active_target = target; |
1ed28f61 SO |
240 | |
241 | error: | |
242 | device_unlock(&dev->dev); | |
243 | return rc; | |
244 | } | |
245 | ||
246 | int 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; | |
90099433 | 275 | dev->active_target = NULL; |
d646960f | 276 | nfc_llcp_mac_is_down(dev); |
1ed28f61 SO |
277 | nfc_genl_dep_link_down_event(dev); |
278 | } | |
279 | ||
280 | error: | |
281 | device_unlock(&dev->dev); | |
282 | return rc; | |
283 | } | |
284 | ||
285 | int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, | |
0a40acb2 | 286 | u8 comm_mode, u8 rf_mode) |
1ed28f61 SO |
287 | { |
288 | dev->dep_link_up = true; | |
289 | dev->dep_rf_mode = rf_mode; | |
290 | ||
d646960f SO |
291 | nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode); |
292 | ||
1ed28f61 SO |
293 | return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode); |
294 | } | |
295 | EXPORT_SYMBOL(nfc_dep_link_is_up); | |
296 | ||
3e256b8f LRV |
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 | */ | |
304 | int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol) | |
305 | { | |
306 | int rc; | |
90099433 | 307 | struct nfc_target *target; |
3e256b8f | 308 | |
20c239c1 JP |
309 | pr_debug("dev_name=%s target_idx=%u protocol=%u\n", |
310 | dev_name(&dev->dev), target_idx, protocol); | |
3e256b8f LRV |
311 | |
312 | device_lock(&dev->dev); | |
313 | ||
314 | if (!device_is_registered(&dev->dev)) { | |
315 | rc = -ENODEV; | |
316 | goto error; | |
317 | } | |
318 | ||
90099433 EL |
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); | |
c8d56ae7 | 331 | if (!rc) { |
90099433 | 332 | dev->active_target = target; |
3e256b8f | 333 | |
c8d56ae7 EL |
334 | if (dev->ops->check_presence) |
335 | mod_timer(&dev->check_pres_timer, jiffies + | |
336 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); | |
337 | } | |
3e256b8f LRV |
338 | |
339 | error: | |
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 | */ | |
350 | int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx) | |
351 | { | |
352 | int rc = 0; | |
353 | ||
20c239c1 JP |
354 | pr_debug("dev_name=%s target_idx=%u\n", |
355 | dev_name(&dev->dev), target_idx); | |
3e256b8f LRV |
356 | |
357 | device_lock(&dev->dev); | |
358 | ||
359 | if (!device_is_registered(&dev->dev)) { | |
360 | rc = -ENODEV; | |
361 | goto error; | |
362 | } | |
363 | ||
90099433 EL |
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 | ||
c8d56ae7 EL |
374 | if (dev->ops->check_presence) |
375 | del_timer_sync(&dev->check_pres_timer); | |
376 | ||
90099433 EL |
377 | dev->ops->deactivate_target(dev, dev->active_target); |
378 | dev->active_target = NULL; | |
3e256b8f LRV |
379 | |
380 | error: | |
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 | */ | |
0a40acb2 SO |
396 | int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb, |
397 | data_exchange_cb_t cb, void *cb_context) | |
3e256b8f LRV |
398 | { |
399 | int rc; | |
400 | ||
20c239c1 JP |
401 | pr_debug("dev_name=%s target_idx=%u skb->len=%u\n", |
402 | dev_name(&dev->dev), target_idx, skb->len); | |
3e256b8f LRV |
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 | ||
90099433 | 412 | if (dev->active_target == NULL) { |
144612ca EL |
413 | rc = -ENOTCONN; |
414 | kfree_skb(skb); | |
415 | goto error; | |
416 | } | |
417 | ||
90099433 | 418 | if (dev->active_target->idx != target_idx) { |
144612ca EL |
419 | rc = -EADDRNOTAVAIL; |
420 | kfree_skb(skb); | |
421 | goto error; | |
422 | } | |
423 | ||
c8d56ae7 EL |
424 | if (dev->ops->check_presence) |
425 | del_timer_sync(&dev->check_pres_timer); | |
426 | ||
90099433 EL |
427 | rc = dev->ops->data_exchange(dev, dev->active_target, skb, cb, |
428 | cb_context); | |
3e256b8f | 429 | |
c8d56ae7 EL |
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 | ||
3e256b8f LRV |
434 | error: |
435 | device_unlock(&dev->dev); | |
436 | return rc; | |
437 | } | |
438 | ||
541d920b SO |
439 | int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len) |
440 | { | |
0a40acb2 | 441 | pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len); |
541d920b SO |
442 | |
443 | if (gb_len > NFC_MAX_GT_LEN) | |
444 | return -EINVAL; | |
445 | ||
d646960f | 446 | return nfc_llcp_set_remote_gb(dev, gb, gb_len); |
541d920b SO |
447 | } |
448 | EXPORT_SYMBOL(nfc_set_remote_general_bytes); | |
449 | ||
ab73b751 SO |
450 | u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len) |
451 | { | |
452 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); | |
453 | ||
454 | return nfc_llcp_general_bytes(dev, gb_len); | |
455 | } | |
456 | EXPORT_SYMBOL(nfc_get_local_general_bytes); | |
457 | ||
3e256b8f | 458 | /** |
7c7cd3bf | 459 | * nfc_alloc_send_skb - allocate a skb for data exchange responses |
3e256b8f LRV |
460 | * |
461 | * @size: size to allocate | |
462 | * @gfp: gfp flags | |
463 | */ | |
7c7cd3bf | 464 | struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk, |
0a40acb2 SO |
465 | unsigned int flags, unsigned int size, |
466 | unsigned int *err) | |
7c7cd3bf SO |
467 | { |
468 | struct sk_buff *skb; | |
469 | unsigned int total_size; | |
470 | ||
471 | total_size = size + | |
472 | dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
473 | ||
474 | skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err); | |
475 | if (skb) | |
476 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
477 | ||
478 | return skb; | |
479 | } | |
480 | ||
481 | /** | |
482 | * nfc_alloc_recv_skb - allocate a skb for data exchange responses | |
483 | * | |
484 | * @size: size to allocate | |
485 | * @gfp: gfp flags | |
486 | */ | |
487 | struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp) | |
3e256b8f LRV |
488 | { |
489 | struct sk_buff *skb; | |
490 | unsigned int total_size; | |
491 | ||
492 | total_size = size + 1; | |
493 | skb = alloc_skb(total_size, gfp); | |
494 | ||
495 | if (skb) | |
496 | skb_reserve(skb, 1); | |
497 | ||
498 | return skb; | |
499 | } | |
7c7cd3bf | 500 | EXPORT_SYMBOL(nfc_alloc_recv_skb); |
3e256b8f | 501 | |
4d12b8b1 LRV |
502 | /** |
503 | * nfc_targets_found - inform that targets were found | |
504 | * | |
505 | * @dev: The nfc device that found the targets | |
506 | * @targets: array of nfc targets found | |
507 | * @ntargets: targets array size | |
508 | * | |
509 | * The device driver must call this function when one or many nfc targets | |
510 | * are found. After calling this function, the device driver must stop | |
511 | * polling for targets. | |
d4ccb132 EL |
512 | * IMPORTANT: this function must not be called from an atomic context. |
513 | * In addition, it must also not be called from a context that would prevent | |
514 | * the NFC Core to call other nfc ops entry point concurrently. | |
4d12b8b1 | 515 | */ |
0a40acb2 SO |
516 | int nfc_targets_found(struct nfc_dev *dev, |
517 | struct nfc_target *targets, int n_targets) | |
4d12b8b1 | 518 | { |
c4fbb651 SO |
519 | int i; |
520 | ||
20c239c1 | 521 | pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets); |
4d12b8b1 LRV |
522 | |
523 | dev->polling = false; | |
524 | ||
c4fbb651 | 525 | for (i = 0; i < n_targets; i++) |
01ae0eea | 526 | targets[i].idx = dev->target_next_idx++; |
c4fbb651 | 527 | |
d4ccb132 | 528 | device_lock(&dev->dev); |
4d12b8b1 LRV |
529 | |
530 | dev->targets_generation++; | |
531 | ||
532 | kfree(dev->targets); | |
533 | dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target), | |
0a40acb2 | 534 | GFP_ATOMIC); |
4d12b8b1 LRV |
535 | |
536 | if (!dev->targets) { | |
537 | dev->n_targets = 0; | |
d4ccb132 | 538 | device_unlock(&dev->dev); |
4d12b8b1 LRV |
539 | return -ENOMEM; |
540 | } | |
541 | ||
542 | dev->n_targets = n_targets; | |
d4ccb132 | 543 | device_unlock(&dev->dev); |
4d12b8b1 LRV |
544 | |
545 | nfc_genl_targets_found(dev); | |
546 | ||
547 | return 0; | |
548 | } | |
549 | EXPORT_SYMBOL(nfc_targets_found); | |
550 | ||
d4ccb132 EL |
551 | /** |
552 | * nfc_target_lost - inform that an activated target went out of field | |
553 | * | |
554 | * @dev: The nfc device that had the activated target in field | |
555 | * @target_idx: the nfc index of the target | |
556 | * | |
557 | * The device driver must call this function when the activated target | |
558 | * goes out of the field. | |
559 | * IMPORTANT: this function must not be called from an atomic context. | |
560 | * In addition, it must also not be called from a context that would prevent | |
561 | * the NFC Core to call other nfc ops entry point concurrently. | |
562 | */ | |
e1da0efa EL |
563 | int nfc_target_lost(struct nfc_dev *dev, u32 target_idx) |
564 | { | |
565 | struct nfc_target *tg; | |
566 | int i; | |
567 | ||
568 | pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx); | |
569 | ||
d4ccb132 | 570 | device_lock(&dev->dev); |
e1da0efa EL |
571 | |
572 | for (i = 0; i < dev->n_targets; i++) { | |
573 | tg = &dev->targets[i]; | |
574 | if (tg->idx == target_idx) | |
575 | break; | |
576 | } | |
577 | ||
578 | if (i == dev->n_targets) { | |
d4ccb132 | 579 | device_unlock(&dev->dev); |
e1da0efa EL |
580 | return -EINVAL; |
581 | } | |
582 | ||
583 | dev->targets_generation++; | |
584 | dev->n_targets--; | |
90099433 | 585 | dev->active_target = NULL; |
e1da0efa EL |
586 | |
587 | if (dev->n_targets) { | |
588 | memcpy(&dev->targets[i], &dev->targets[i + 1], | |
589 | (dev->n_targets - i) * sizeof(struct nfc_target)); | |
590 | } else { | |
591 | kfree(dev->targets); | |
592 | dev->targets = NULL; | |
593 | } | |
594 | ||
d4ccb132 | 595 | device_unlock(&dev->dev); |
e1da0efa EL |
596 | |
597 | nfc_genl_target_lost(dev, target_idx); | |
598 | ||
599 | return 0; | |
600 | } | |
601 | EXPORT_SYMBOL(nfc_target_lost); | |
602 | ||
3e256b8f LRV |
603 | static void nfc_release(struct device *d) |
604 | { | |
605 | struct nfc_dev *dev = to_nfc_dev(d); | |
606 | ||
20c239c1 | 607 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f | 608 | |
c8d56ae7 EL |
609 | if (dev->ops->check_presence) { |
610 | del_timer_sync(&dev->check_pres_timer); | |
611 | destroy_workqueue(dev->check_pres_wq); | |
612 | } | |
613 | ||
4d12b8b1 LRV |
614 | nfc_genl_data_exit(&dev->genl_data); |
615 | kfree(dev->targets); | |
3e256b8f LRV |
616 | kfree(dev); |
617 | } | |
618 | ||
c8d56ae7 EL |
619 | static void nfc_check_pres_work(struct work_struct *work) |
620 | { | |
621 | struct nfc_dev *dev = container_of(work, struct nfc_dev, | |
622 | check_pres_work); | |
623 | int rc; | |
624 | ||
625 | device_lock(&dev->dev); | |
626 | ||
90099433 EL |
627 | if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) { |
628 | rc = dev->ops->check_presence(dev, dev->active_target); | |
c8d56ae7 EL |
629 | if (!rc) { |
630 | mod_timer(&dev->check_pres_timer, jiffies + | |
631 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); | |
632 | } else { | |
d4ccb132 EL |
633 | u32 active_target_idx = dev->active_target->idx; |
634 | device_unlock(&dev->dev); | |
635 | nfc_target_lost(dev, active_target_idx); | |
636 | return; | |
c8d56ae7 EL |
637 | } |
638 | } | |
639 | ||
640 | device_unlock(&dev->dev); | |
641 | } | |
642 | ||
643 | static void nfc_check_pres_timeout(unsigned long data) | |
644 | { | |
645 | struct nfc_dev *dev = (struct nfc_dev *)data; | |
646 | ||
647 | queue_work(dev->check_pres_wq, &dev->check_pres_work); | |
648 | } | |
649 | ||
3e256b8f LRV |
650 | struct class nfc_class = { |
651 | .name = "nfc", | |
652 | .dev_release = nfc_release, | |
653 | }; | |
654 | EXPORT_SYMBOL(nfc_class); | |
655 | ||
656 | static int match_idx(struct device *d, void *data) | |
657 | { | |
658 | struct nfc_dev *dev = to_nfc_dev(d); | |
95c96174 | 659 | unsigned int *idx = data; |
3e256b8f LRV |
660 | |
661 | return dev->idx == *idx; | |
662 | } | |
663 | ||
95c96174 | 664 | struct nfc_dev *nfc_get_device(unsigned int idx) |
3e256b8f LRV |
665 | { |
666 | struct device *d; | |
667 | ||
668 | d = class_find_device(&nfc_class, NULL, &idx, match_idx); | |
669 | if (!d) | |
670 | return NULL; | |
671 | ||
672 | return to_nfc_dev(d); | |
673 | } | |
674 | ||
675 | /** | |
676 | * nfc_allocate_device - allocate a new nfc device | |
677 | * | |
678 | * @ops: device operations | |
679 | * @supported_protocols: NFC protocols supported by the device | |
680 | */ | |
681 | struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, | |
0a40acb2 SO |
682 | u32 supported_protocols, |
683 | int tx_headroom, int tx_tailroom) | |
3e256b8f LRV |
684 | { |
685 | static atomic_t dev_no = ATOMIC_INIT(0); | |
686 | struct nfc_dev *dev; | |
687 | ||
688 | if (!ops->start_poll || !ops->stop_poll || !ops->activate_target || | |
0a40acb2 | 689 | !ops->deactivate_target || !ops->data_exchange) |
3e256b8f LRV |
690 | return NULL; |
691 | ||
692 | if (!supported_protocols) | |
693 | return NULL; | |
694 | ||
695 | dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL); | |
696 | if (!dev) | |
697 | return NULL; | |
698 | ||
699 | dev->dev.class = &nfc_class; | |
700 | dev->idx = atomic_inc_return(&dev_no) - 1; | |
701 | dev_set_name(&dev->dev, "nfc%d", dev->idx); | |
702 | device_initialize(&dev->dev); | |
703 | ||
704 | dev->ops = ops; | |
705 | dev->supported_protocols = supported_protocols; | |
e8753043 SO |
706 | dev->tx_headroom = tx_headroom; |
707 | dev->tx_tailroom = tx_tailroom; | |
3e256b8f | 708 | |
4d12b8b1 LRV |
709 | nfc_genl_data_init(&dev->genl_data); |
710 | ||
d4ccb132 | 711 | |
4d12b8b1 LRV |
712 | /* first generation must not be 0 */ |
713 | dev->targets_generation = 1; | |
714 | ||
c8d56ae7 EL |
715 | if (ops->check_presence) { |
716 | char name[32]; | |
717 | init_timer(&dev->check_pres_timer); | |
718 | dev->check_pres_timer.data = (unsigned long)dev; | |
719 | dev->check_pres_timer.function = nfc_check_pres_timeout; | |
720 | ||
721 | INIT_WORK(&dev->check_pres_work, nfc_check_pres_work); | |
722 | snprintf(name, sizeof(name), "nfc%d_check_pres_wq", dev->idx); | |
723 | dev->check_pres_wq = alloc_workqueue(name, WQ_NON_REENTRANT | | |
724 | WQ_UNBOUND | | |
725 | WQ_MEM_RECLAIM, 1); | |
726 | if (dev->check_pres_wq == NULL) { | |
727 | kfree(dev); | |
728 | return NULL; | |
729 | } | |
730 | } | |
731 | ||
3e256b8f LRV |
732 | return dev; |
733 | } | |
734 | EXPORT_SYMBOL(nfc_allocate_device); | |
735 | ||
736 | /** | |
737 | * nfc_register_device - register a nfc device in the nfc subsystem | |
738 | * | |
739 | * @dev: The nfc device to register | |
740 | */ | |
741 | int nfc_register_device(struct nfc_dev *dev) | |
742 | { | |
743 | int rc; | |
744 | ||
20c239c1 | 745 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
746 | |
747 | mutex_lock(&nfc_devlist_mutex); | |
748 | nfc_devlist_generation++; | |
749 | rc = device_add(&dev->dev); | |
750 | mutex_unlock(&nfc_devlist_mutex); | |
751 | ||
4d12b8b1 LRV |
752 | if (rc < 0) |
753 | return rc; | |
754 | ||
d646960f SO |
755 | rc = nfc_llcp_register_device(dev); |
756 | if (rc) | |
757 | pr_err("Could not register llcp device\n"); | |
758 | ||
4d12b8b1 LRV |
759 | rc = nfc_genl_device_added(dev); |
760 | if (rc) | |
20c239c1 JP |
761 | pr_debug("The userspace won't be notified that the device %s was added\n", |
762 | dev_name(&dev->dev)); | |
4d12b8b1 LRV |
763 | |
764 | return 0; | |
3e256b8f LRV |
765 | } |
766 | EXPORT_SYMBOL(nfc_register_device); | |
767 | ||
768 | /** | |
769 | * nfc_unregister_device - unregister a nfc device in the nfc subsystem | |
770 | * | |
771 | * @dev: The nfc device to unregister | |
772 | */ | |
773 | void nfc_unregister_device(struct nfc_dev *dev) | |
774 | { | |
4d12b8b1 LRV |
775 | int rc; |
776 | ||
20c239c1 | 777 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
778 | |
779 | mutex_lock(&nfc_devlist_mutex); | |
780 | nfc_devlist_generation++; | |
781 | ||
782 | /* lock to avoid unregistering a device while an operation | |
783 | is in progress */ | |
784 | device_lock(&dev->dev); | |
785 | device_del(&dev->dev); | |
786 | device_unlock(&dev->dev); | |
787 | ||
788 | mutex_unlock(&nfc_devlist_mutex); | |
4d12b8b1 | 789 | |
d646960f SO |
790 | nfc_llcp_unregister_device(dev); |
791 | ||
4d12b8b1 LRV |
792 | rc = nfc_genl_device_removed(dev); |
793 | if (rc) | |
20c239c1 JP |
794 | pr_debug("The userspace won't be notified that the device %s was removed\n", |
795 | dev_name(&dev->dev)); | |
4d12b8b1 | 796 | |
3e256b8f LRV |
797 | } |
798 | EXPORT_SYMBOL(nfc_unregister_device); | |
799 | ||
800 | static int __init nfc_init(void) | |
801 | { | |
4d12b8b1 LRV |
802 | int rc; |
803 | ||
ed1e0ad8 | 804 | pr_info("NFC Core ver %s\n", VERSION); |
3e256b8f | 805 | |
4d12b8b1 LRV |
806 | rc = class_register(&nfc_class); |
807 | if (rc) | |
808 | return rc; | |
809 | ||
810 | rc = nfc_genl_init(); | |
811 | if (rc) | |
812 | goto err_genl; | |
813 | ||
814 | /* the first generation must not be 0 */ | |
815 | nfc_devlist_generation = 1; | |
816 | ||
23b7869c LRV |
817 | rc = rawsock_init(); |
818 | if (rc) | |
819 | goto err_rawsock; | |
820 | ||
d646960f SO |
821 | rc = nfc_llcp_init(); |
822 | if (rc) | |
823 | goto err_llcp_sock; | |
824 | ||
c7fe3b52 AAJ |
825 | rc = af_nfc_init(); |
826 | if (rc) | |
827 | goto err_af_nfc; | |
828 | ||
4d12b8b1 LRV |
829 | return 0; |
830 | ||
c7fe3b52 | 831 | err_af_nfc: |
d646960f SO |
832 | nfc_llcp_exit(); |
833 | err_llcp_sock: | |
23b7869c LRV |
834 | rawsock_exit(); |
835 | err_rawsock: | |
c7fe3b52 | 836 | nfc_genl_exit(); |
4d12b8b1 LRV |
837 | err_genl: |
838 | class_unregister(&nfc_class); | |
839 | return rc; | |
3e256b8f LRV |
840 | } |
841 | ||
842 | static void __exit nfc_exit(void) | |
843 | { | |
c7fe3b52 | 844 | af_nfc_exit(); |
d646960f | 845 | nfc_llcp_exit(); |
23b7869c | 846 | rawsock_exit(); |
4d12b8b1 | 847 | nfc_genl_exit(); |
3e256b8f LRV |
848 | class_unregister(&nfc_class); |
849 | } | |
850 | ||
851 | subsys_initcall(nfc_init); | |
852 | module_exit(nfc_exit); | |
853 | ||
854 | MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); | |
855 | MODULE_DESCRIPTION("NFC Core ver " VERSION); | |
856 | MODULE_VERSION(VERSION); | |
857 | MODULE_LICENSE("GPL"); |