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> | |
be055b2f | 30 | #include <linux/rfkill.h> |
7c7cd3bf | 31 | #include <linux/nfc.h> |
3e256b8f | 32 | |
5df16cad SO |
33 | #include <net/genetlink.h> |
34 | ||
3e256b8f LRV |
35 | #include "nfc.h" |
36 | ||
37 | #define VERSION "0.1" | |
38 | ||
c8d56ae7 EL |
39 | #define NFC_CHECK_PRES_FREQ_MS 2000 |
40 | ||
3e256b8f LRV |
41 | int nfc_devlist_generation; |
42 | DEFINE_MUTEX(nfc_devlist_mutex); | |
43 | ||
7eda8b8e SO |
44 | /* NFC device ID bitmap */ |
45 | static DEFINE_IDA(nfc_index_ida); | |
46 | ||
8b3fe7b5 IE |
47 | /** |
48 | * nfc_dev_up - turn on the NFC device | |
49 | * | |
50 | * @dev: The nfc device to be turned on | |
51 | * | |
52 | * The device remains up until the nfc_dev_down function is called. | |
53 | */ | |
54 | int nfc_dev_up(struct nfc_dev *dev) | |
55 | { | |
56 | int rc = 0; | |
57 | ||
20c239c1 | 58 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
8b3fe7b5 IE |
59 | |
60 | device_lock(&dev->dev); | |
61 | ||
be055b2f SO |
62 | if (dev->rfkill && rfkill_blocked(dev->rfkill)) { |
63 | rc = -ERFKILL; | |
64 | goto error; | |
65 | } | |
66 | ||
8b3fe7b5 IE |
67 | if (!device_is_registered(&dev->dev)) { |
68 | rc = -ENODEV; | |
69 | goto error; | |
70 | } | |
71 | ||
72 | if (dev->dev_up) { | |
73 | rc = -EALREADY; | |
74 | goto error; | |
75 | } | |
76 | ||
77 | if (dev->ops->dev_up) | |
78 | rc = dev->ops->dev_up(dev); | |
79 | ||
80 | if (!rc) | |
81 | dev->dev_up = true; | |
82 | ||
83 | error: | |
84 | device_unlock(&dev->dev); | |
85 | return rc; | |
86 | } | |
87 | ||
88 | /** | |
89 | * nfc_dev_down - turn off the NFC device | |
90 | * | |
91 | * @dev: The nfc device to be turned off | |
92 | */ | |
93 | int nfc_dev_down(struct nfc_dev *dev) | |
94 | { | |
95 | int rc = 0; | |
96 | ||
20c239c1 | 97 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
8b3fe7b5 IE |
98 | |
99 | device_lock(&dev->dev); | |
100 | ||
101 | if (!device_is_registered(&dev->dev)) { | |
102 | rc = -ENODEV; | |
103 | goto error; | |
104 | } | |
105 | ||
106 | if (!dev->dev_up) { | |
107 | rc = -EALREADY; | |
108 | goto error; | |
109 | } | |
110 | ||
90099433 | 111 | if (dev->polling || dev->active_target) { |
8b3fe7b5 IE |
112 | rc = -EBUSY; |
113 | goto error; | |
114 | } | |
115 | ||
116 | if (dev->ops->dev_down) | |
117 | dev->ops->dev_down(dev); | |
118 | ||
119 | dev->dev_up = false; | |
120 | ||
121 | error: | |
122 | device_unlock(&dev->dev); | |
123 | return rc; | |
124 | } | |
125 | ||
be055b2f SO |
126 | static int nfc_rfkill_set_block(void *data, bool blocked) |
127 | { | |
128 | struct nfc_dev *dev = data; | |
129 | ||
130 | pr_debug("%s blocked %d", dev_name(&dev->dev), blocked); | |
131 | ||
132 | if (!blocked) | |
133 | return 0; | |
134 | ||
135 | nfc_dev_down(dev); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | static const struct rfkill_ops nfc_rfkill_ops = { | |
141 | .set_block = nfc_rfkill_set_block, | |
142 | }; | |
143 | ||
3e256b8f LRV |
144 | /** |
145 | * nfc_start_poll - start polling for nfc targets | |
146 | * | |
147 | * @dev: The nfc device that must start polling | |
148 | * @protocols: bitset of nfc protocols that must be used for polling | |
149 | * | |
150 | * The device remains polling for targets until a target is found or | |
151 | * the nfc_stop_poll function is called. | |
152 | */ | |
fe7c5800 | 153 | int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols) |
3e256b8f LRV |
154 | { |
155 | int rc; | |
156 | ||
fe7c5800 SO |
157 | pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n", |
158 | dev_name(&dev->dev), im_protocols, tm_protocols); | |
3e256b8f | 159 | |
fe7c5800 | 160 | if (!im_protocols && !tm_protocols) |
3e256b8f LRV |
161 | return -EINVAL; |
162 | ||
163 | device_lock(&dev->dev); | |
164 | ||
165 | if (!device_is_registered(&dev->dev)) { | |
166 | rc = -ENODEV; | |
167 | goto error; | |
168 | } | |
169 | ||
7757dc8a SO |
170 | if (!dev->dev_up) { |
171 | rc = -ENODEV; | |
172 | goto error; | |
173 | } | |
174 | ||
3e256b8f LRV |
175 | if (dev->polling) { |
176 | rc = -EBUSY; | |
177 | goto error; | |
178 | } | |
179 | ||
fe7c5800 | 180 | rc = dev->ops->start_poll(dev, im_protocols, tm_protocols); |
f212ad5e | 181 | if (!rc) { |
3e256b8f | 182 | dev->polling = true; |
f212ad5e SO |
183 | dev->rf_mode = NFC_RF_NONE; |
184 | } | |
3e256b8f LRV |
185 | |
186 | error: | |
187 | device_unlock(&dev->dev); | |
188 | return rc; | |
189 | } | |
190 | ||
191 | /** | |
192 | * nfc_stop_poll - stop polling for nfc targets | |
193 | * | |
194 | * @dev: The nfc device that must stop polling | |
195 | */ | |
196 | int nfc_stop_poll(struct nfc_dev *dev) | |
197 | { | |
198 | int rc = 0; | |
199 | ||
20c239c1 | 200 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
201 | |
202 | device_lock(&dev->dev); | |
203 | ||
204 | if (!device_is_registered(&dev->dev)) { | |
205 | rc = -ENODEV; | |
206 | goto error; | |
207 | } | |
208 | ||
209 | if (!dev->polling) { | |
210 | rc = -EINVAL; | |
211 | goto error; | |
212 | } | |
213 | ||
214 | dev->ops->stop_poll(dev); | |
215 | dev->polling = false; | |
5bcf099c | 216 | dev->rf_mode = NFC_RF_NONE; |
3e256b8f LRV |
217 | |
218 | error: | |
219 | device_unlock(&dev->dev); | |
220 | return rc; | |
221 | } | |
222 | ||
90099433 EL |
223 | static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx) |
224 | { | |
225 | int i; | |
226 | ||
227 | if (dev->n_targets == 0) | |
228 | return NULL; | |
229 | ||
0f450772 | 230 | for (i = 0; i < dev->n_targets; i++) { |
90099433 EL |
231 | if (dev->targets[i].idx == target_idx) |
232 | return &dev->targets[i]; | |
233 | } | |
234 | ||
235 | return NULL; | |
236 | } | |
237 | ||
47807d3d | 238 | int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode) |
1ed28f61 SO |
239 | { |
240 | int rc = 0; | |
47807d3d SO |
241 | u8 *gb; |
242 | size_t gb_len; | |
90099433 | 243 | struct nfc_target *target; |
1ed28f61 | 244 | |
47807d3d | 245 | pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode); |
1ed28f61 SO |
246 | |
247 | if (!dev->ops->dep_link_up) | |
248 | return -EOPNOTSUPP; | |
249 | ||
250 | device_lock(&dev->dev); | |
251 | ||
252 | if (!device_is_registered(&dev->dev)) { | |
253 | rc = -ENODEV; | |
254 | goto error; | |
255 | } | |
256 | ||
257 | if (dev->dep_link_up == true) { | |
258 | rc = -EALREADY; | |
259 | goto error; | |
260 | } | |
261 | ||
47807d3d SO |
262 | gb = nfc_llcp_general_bytes(dev, &gb_len); |
263 | if (gb_len > NFC_MAX_GT_LEN) { | |
264 | rc = -EINVAL; | |
265 | goto error; | |
266 | } | |
267 | ||
90099433 EL |
268 | target = nfc_find_target(dev, target_index); |
269 | if (target == NULL) { | |
270 | rc = -ENOTCONN; | |
271 | goto error; | |
272 | } | |
273 | ||
274 | rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len); | |
f212ad5e | 275 | if (!rc) { |
90099433 | 276 | dev->active_target = target; |
f212ad5e SO |
277 | dev->rf_mode = NFC_RF_INITIATOR; |
278 | } | |
1ed28f61 SO |
279 | |
280 | error: | |
281 | device_unlock(&dev->dev); | |
282 | return rc; | |
283 | } | |
284 | ||
285 | int nfc_dep_link_down(struct nfc_dev *dev) | |
286 | { | |
287 | int rc = 0; | |
288 | ||
289 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); | |
290 | ||
291 | if (!dev->ops->dep_link_down) | |
292 | return -EOPNOTSUPP; | |
293 | ||
294 | device_lock(&dev->dev); | |
295 | ||
296 | if (!device_is_registered(&dev->dev)) { | |
297 | rc = -ENODEV; | |
298 | goto error; | |
299 | } | |
300 | ||
301 | if (dev->dep_link_up == false) { | |
302 | rc = -EALREADY; | |
303 | goto error; | |
304 | } | |
305 | ||
1ed28f61 SO |
306 | rc = dev->ops->dep_link_down(dev); |
307 | if (!rc) { | |
308 | dev->dep_link_up = false; | |
90099433 | 309 | dev->active_target = NULL; |
5bcf099c | 310 | dev->rf_mode = NFC_RF_NONE; |
d646960f | 311 | nfc_llcp_mac_is_down(dev); |
1ed28f61 SO |
312 | nfc_genl_dep_link_down_event(dev); |
313 | } | |
314 | ||
315 | error: | |
316 | device_unlock(&dev->dev); | |
5bcf099c | 317 | |
1ed28f61 SO |
318 | return rc; |
319 | } | |
320 | ||
321 | int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, | |
0a40acb2 | 322 | u8 comm_mode, u8 rf_mode) |
1ed28f61 SO |
323 | { |
324 | dev->dep_link_up = true; | |
1ed28f61 | 325 | |
d646960f SO |
326 | nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode); |
327 | ||
1ed28f61 SO |
328 | return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode); |
329 | } | |
330 | EXPORT_SYMBOL(nfc_dep_link_is_up); | |
331 | ||
3e256b8f LRV |
332 | /** |
333 | * nfc_activate_target - prepare the target for data exchange | |
334 | * | |
335 | * @dev: The nfc device that found the target | |
336 | * @target_idx: index of the target that must be activated | |
337 | * @protocol: nfc protocol that will be used for data exchange | |
338 | */ | |
339 | int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol) | |
340 | { | |
341 | int rc; | |
90099433 | 342 | struct nfc_target *target; |
3e256b8f | 343 | |
20c239c1 JP |
344 | pr_debug("dev_name=%s target_idx=%u protocol=%u\n", |
345 | dev_name(&dev->dev), target_idx, protocol); | |
3e256b8f LRV |
346 | |
347 | device_lock(&dev->dev); | |
348 | ||
349 | if (!device_is_registered(&dev->dev)) { | |
350 | rc = -ENODEV; | |
351 | goto error; | |
352 | } | |
353 | ||
90099433 EL |
354 | if (dev->active_target) { |
355 | rc = -EBUSY; | |
356 | goto error; | |
357 | } | |
358 | ||
359 | target = nfc_find_target(dev, target_idx); | |
360 | if (target == NULL) { | |
361 | rc = -ENOTCONN; | |
362 | goto error; | |
363 | } | |
364 | ||
365 | rc = dev->ops->activate_target(dev, target, protocol); | |
c8d56ae7 | 366 | if (!rc) { |
90099433 | 367 | dev->active_target = target; |
f212ad5e | 368 | dev->rf_mode = NFC_RF_INITIATOR; |
3e256b8f | 369 | |
f0c91038 | 370 | if (dev->ops->check_presence && !dev->shutting_down) |
c8d56ae7 EL |
371 | mod_timer(&dev->check_pres_timer, jiffies + |
372 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); | |
373 | } | |
3e256b8f LRV |
374 | |
375 | error: | |
376 | device_unlock(&dev->dev); | |
377 | return rc; | |
378 | } | |
379 | ||
380 | /** | |
381 | * nfc_deactivate_target - deactivate a nfc target | |
382 | * | |
383 | * @dev: The nfc device that found the target | |
384 | * @target_idx: index of the target that must be deactivated | |
385 | */ | |
386 | int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx) | |
387 | { | |
388 | int rc = 0; | |
389 | ||
20c239c1 JP |
390 | pr_debug("dev_name=%s target_idx=%u\n", |
391 | dev_name(&dev->dev), target_idx); | |
3e256b8f LRV |
392 | |
393 | device_lock(&dev->dev); | |
394 | ||
395 | if (!device_is_registered(&dev->dev)) { | |
396 | rc = -ENODEV; | |
397 | goto error; | |
398 | } | |
399 | ||
90099433 EL |
400 | if (dev->active_target == NULL) { |
401 | rc = -ENOTCONN; | |
402 | goto error; | |
403 | } | |
404 | ||
405 | if (dev->active_target->idx != target_idx) { | |
406 | rc = -ENOTCONN; | |
407 | goto error; | |
408 | } | |
409 | ||
c8d56ae7 EL |
410 | if (dev->ops->check_presence) |
411 | del_timer_sync(&dev->check_pres_timer); | |
412 | ||
90099433 EL |
413 | dev->ops->deactivate_target(dev, dev->active_target); |
414 | dev->active_target = NULL; | |
3e256b8f LRV |
415 | |
416 | error: | |
417 | device_unlock(&dev->dev); | |
418 | return rc; | |
419 | } | |
420 | ||
421 | /** | |
422 | * nfc_data_exchange - transceive data | |
423 | * | |
424 | * @dev: The nfc device that found the target | |
425 | * @target_idx: index of the target | |
426 | * @skb: data to be sent | |
427 | * @cb: callback called when the response is received | |
428 | * @cb_context: parameter for the callback function | |
429 | * | |
430 | * The user must wait for the callback before calling this function again. | |
431 | */ | |
0a40acb2 SO |
432 | int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb, |
433 | data_exchange_cb_t cb, void *cb_context) | |
3e256b8f LRV |
434 | { |
435 | int rc; | |
436 | ||
20c239c1 JP |
437 | pr_debug("dev_name=%s target_idx=%u skb->len=%u\n", |
438 | dev_name(&dev->dev), target_idx, skb->len); | |
3e256b8f LRV |
439 | |
440 | device_lock(&dev->dev); | |
441 | ||
442 | if (!device_is_registered(&dev->dev)) { | |
443 | rc = -ENODEV; | |
444 | kfree_skb(skb); | |
445 | goto error; | |
446 | } | |
447 | ||
be9ae4ce SO |
448 | if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) { |
449 | if (dev->active_target->idx != target_idx) { | |
450 | rc = -EADDRNOTAVAIL; | |
451 | kfree_skb(skb); | |
452 | goto error; | |
453 | } | |
144612ca | 454 | |
be9ae4ce SO |
455 | if (dev->ops->check_presence) |
456 | del_timer_sync(&dev->check_pres_timer); | |
457 | ||
458 | rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb, | |
459 | cb_context); | |
460 | ||
f0c91038 | 461 | if (!rc && dev->ops->check_presence && !dev->shutting_down) |
be9ae4ce SO |
462 | mod_timer(&dev->check_pres_timer, jiffies + |
463 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); | |
464 | } else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) { | |
465 | rc = dev->ops->tm_send(dev, skb); | |
466 | } else { | |
467 | rc = -ENOTCONN; | |
144612ca EL |
468 | kfree_skb(skb); |
469 | goto error; | |
470 | } | |
471 | ||
c8d56ae7 | 472 | |
3e256b8f LRV |
473 | error: |
474 | device_unlock(&dev->dev); | |
475 | return rc; | |
476 | } | |
477 | ||
541d920b SO |
478 | int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len) |
479 | { | |
0a40acb2 | 480 | pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len); |
541d920b SO |
481 | |
482 | if (gb_len > NFC_MAX_GT_LEN) | |
483 | return -EINVAL; | |
484 | ||
d646960f | 485 | return nfc_llcp_set_remote_gb(dev, gb, gb_len); |
541d920b SO |
486 | } |
487 | EXPORT_SYMBOL(nfc_set_remote_general_bytes); | |
488 | ||
ab73b751 SO |
489 | u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len) |
490 | { | |
491 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); | |
492 | ||
493 | return nfc_llcp_general_bytes(dev, gb_len); | |
494 | } | |
495 | EXPORT_SYMBOL(nfc_get_local_general_bytes); | |
496 | ||
73167ced SO |
497 | int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb) |
498 | { | |
499 | /* Only LLCP target mode for now */ | |
500 | if (dev->dep_link_up == false) { | |
501 | kfree_skb(skb); | |
502 | return -ENOLINK; | |
503 | } | |
504 | ||
505 | return nfc_llcp_data_received(dev, skb); | |
506 | } | |
507 | EXPORT_SYMBOL(nfc_tm_data_received); | |
508 | ||
fc40a8c1 SO |
509 | int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode, |
510 | u8 *gb, size_t gb_len) | |
511 | { | |
512 | int rc; | |
513 | ||
514 | device_lock(&dev->dev); | |
515 | ||
516 | dev->polling = false; | |
517 | ||
518 | if (gb != NULL) { | |
519 | rc = nfc_set_remote_general_bytes(dev, gb, gb_len); | |
520 | if (rc < 0) | |
521 | goto out; | |
522 | } | |
523 | ||
f212ad5e SO |
524 | dev->rf_mode = NFC_RF_TARGET; |
525 | ||
fc40a8c1 SO |
526 | if (protocol == NFC_PROTO_NFC_DEP_MASK) |
527 | nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET); | |
528 | ||
529 | rc = nfc_genl_tm_activated(dev, protocol); | |
530 | ||
531 | out: | |
532 | device_unlock(&dev->dev); | |
533 | ||
534 | return rc; | |
535 | } | |
536 | EXPORT_SYMBOL(nfc_tm_activated); | |
537 | ||
538 | int nfc_tm_deactivated(struct nfc_dev *dev) | |
539 | { | |
540 | dev->dep_link_up = false; | |
5bcf099c | 541 | dev->rf_mode = NFC_RF_NONE; |
fc40a8c1 SO |
542 | |
543 | return nfc_genl_tm_deactivated(dev); | |
544 | } | |
545 | EXPORT_SYMBOL(nfc_tm_deactivated); | |
546 | ||
3e256b8f | 547 | /** |
7c7cd3bf | 548 | * nfc_alloc_send_skb - allocate a skb for data exchange responses |
3e256b8f LRV |
549 | * |
550 | * @size: size to allocate | |
551 | * @gfp: gfp flags | |
552 | */ | |
7c7cd3bf | 553 | struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk, |
0a40acb2 SO |
554 | unsigned int flags, unsigned int size, |
555 | unsigned int *err) | |
7c7cd3bf SO |
556 | { |
557 | struct sk_buff *skb; | |
558 | unsigned int total_size; | |
559 | ||
560 | total_size = size + | |
561 | dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
562 | ||
563 | skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err); | |
564 | if (skb) | |
565 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
566 | ||
567 | return skb; | |
568 | } | |
569 | ||
570 | /** | |
571 | * nfc_alloc_recv_skb - allocate a skb for data exchange responses | |
572 | * | |
573 | * @size: size to allocate | |
574 | * @gfp: gfp flags | |
575 | */ | |
576 | struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp) | |
3e256b8f LRV |
577 | { |
578 | struct sk_buff *skb; | |
579 | unsigned int total_size; | |
580 | ||
581 | total_size = size + 1; | |
582 | skb = alloc_skb(total_size, gfp); | |
583 | ||
584 | if (skb) | |
585 | skb_reserve(skb, 1); | |
586 | ||
587 | return skb; | |
588 | } | |
7c7cd3bf | 589 | EXPORT_SYMBOL(nfc_alloc_recv_skb); |
3e256b8f | 590 | |
4d12b8b1 LRV |
591 | /** |
592 | * nfc_targets_found - inform that targets were found | |
593 | * | |
594 | * @dev: The nfc device that found the targets | |
595 | * @targets: array of nfc targets found | |
596 | * @ntargets: targets array size | |
597 | * | |
598 | * The device driver must call this function when one or many nfc targets | |
599 | * are found. After calling this function, the device driver must stop | |
600 | * polling for targets. | |
d94f9c55 EL |
601 | * NOTE: This function can be called with targets=NULL and n_targets=0 to |
602 | * notify a driver error, meaning that the polling operation cannot complete. | |
d4ccb132 EL |
603 | * IMPORTANT: this function must not be called from an atomic context. |
604 | * In addition, it must also not be called from a context that would prevent | |
605 | * the NFC Core to call other nfc ops entry point concurrently. | |
4d12b8b1 | 606 | */ |
0a40acb2 SO |
607 | int nfc_targets_found(struct nfc_dev *dev, |
608 | struct nfc_target *targets, int n_targets) | |
4d12b8b1 | 609 | { |
c4fbb651 SO |
610 | int i; |
611 | ||
20c239c1 | 612 | pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets); |
4d12b8b1 | 613 | |
c4fbb651 | 614 | for (i = 0; i < n_targets; i++) |
01ae0eea | 615 | targets[i].idx = dev->target_next_idx++; |
c4fbb651 | 616 | |
d4ccb132 | 617 | device_lock(&dev->dev); |
4d12b8b1 | 618 | |
8668fdd6 EL |
619 | if (dev->polling == false) { |
620 | device_unlock(&dev->dev); | |
621 | return 0; | |
622 | } | |
623 | ||
624 | dev->polling = false; | |
625 | ||
4d12b8b1 LRV |
626 | dev->targets_generation++; |
627 | ||
628 | kfree(dev->targets); | |
d94f9c55 | 629 | dev->targets = NULL; |
4d12b8b1 | 630 | |
d94f9c55 EL |
631 | if (targets) { |
632 | dev->targets = kmemdup(targets, | |
633 | n_targets * sizeof(struct nfc_target), | |
634 | GFP_ATOMIC); | |
635 | ||
636 | if (!dev->targets) { | |
637 | dev->n_targets = 0; | |
638 | device_unlock(&dev->dev); | |
639 | return -ENOMEM; | |
640 | } | |
4d12b8b1 LRV |
641 | } |
642 | ||
643 | dev->n_targets = n_targets; | |
d4ccb132 | 644 | device_unlock(&dev->dev); |
4d12b8b1 LRV |
645 | |
646 | nfc_genl_targets_found(dev); | |
647 | ||
648 | return 0; | |
649 | } | |
650 | EXPORT_SYMBOL(nfc_targets_found); | |
651 | ||
d4ccb132 EL |
652 | /** |
653 | * nfc_target_lost - inform that an activated target went out of field | |
654 | * | |
655 | * @dev: The nfc device that had the activated target in field | |
656 | * @target_idx: the nfc index of the target | |
657 | * | |
658 | * The device driver must call this function when the activated target | |
659 | * goes out of the field. | |
660 | * IMPORTANT: this function must not be called from an atomic context. | |
661 | * In addition, it must also not be called from a context that would prevent | |
662 | * the NFC Core to call other nfc ops entry point concurrently. | |
663 | */ | |
e1da0efa EL |
664 | int nfc_target_lost(struct nfc_dev *dev, u32 target_idx) |
665 | { | |
666 | struct nfc_target *tg; | |
667 | int i; | |
668 | ||
669 | pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx); | |
670 | ||
d4ccb132 | 671 | device_lock(&dev->dev); |
e1da0efa EL |
672 | |
673 | for (i = 0; i < dev->n_targets; i++) { | |
674 | tg = &dev->targets[i]; | |
675 | if (tg->idx == target_idx) | |
676 | break; | |
677 | } | |
678 | ||
679 | if (i == dev->n_targets) { | |
d4ccb132 | 680 | device_unlock(&dev->dev); |
e1da0efa EL |
681 | return -EINVAL; |
682 | } | |
683 | ||
684 | dev->targets_generation++; | |
685 | dev->n_targets--; | |
90099433 | 686 | dev->active_target = NULL; |
e1da0efa EL |
687 | |
688 | if (dev->n_targets) { | |
689 | memcpy(&dev->targets[i], &dev->targets[i + 1], | |
690 | (dev->n_targets - i) * sizeof(struct nfc_target)); | |
691 | } else { | |
692 | kfree(dev->targets); | |
693 | dev->targets = NULL; | |
694 | } | |
695 | ||
d4ccb132 | 696 | device_unlock(&dev->dev); |
e1da0efa EL |
697 | |
698 | nfc_genl_target_lost(dev, target_idx); | |
699 | ||
700 | return 0; | |
701 | } | |
702 | EXPORT_SYMBOL(nfc_target_lost); | |
703 | ||
9eb334ac | 704 | inline void nfc_driver_failure(struct nfc_dev *dev, int err) |
456411ca | 705 | { |
9eb334ac | 706 | nfc_targets_found(dev, NULL, 0); |
456411ca EL |
707 | } |
708 | EXPORT_SYMBOL(nfc_driver_failure); | |
709 | ||
3e256b8f LRV |
710 | static void nfc_release(struct device *d) |
711 | { | |
712 | struct nfc_dev *dev = to_nfc_dev(d); | |
713 | ||
20c239c1 | 714 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f | 715 | |
4d12b8b1 LRV |
716 | nfc_genl_data_exit(&dev->genl_data); |
717 | kfree(dev->targets); | |
3e256b8f LRV |
718 | kfree(dev); |
719 | } | |
720 | ||
c8d56ae7 EL |
721 | static void nfc_check_pres_work(struct work_struct *work) |
722 | { | |
723 | struct nfc_dev *dev = container_of(work, struct nfc_dev, | |
724 | check_pres_work); | |
725 | int rc; | |
726 | ||
727 | device_lock(&dev->dev); | |
728 | ||
90099433 EL |
729 | if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) { |
730 | rc = dev->ops->check_presence(dev, dev->active_target); | |
632c016a EL |
731 | if (rc == -EOPNOTSUPP) |
732 | goto exit; | |
f0c91038 | 733 | if (rc) { |
d4ccb132 EL |
734 | u32 active_target_idx = dev->active_target->idx; |
735 | device_unlock(&dev->dev); | |
736 | nfc_target_lost(dev, active_target_idx); | |
737 | return; | |
c8d56ae7 | 738 | } |
f0c91038 EL |
739 | |
740 | if (!dev->shutting_down) | |
741 | mod_timer(&dev->check_pres_timer, jiffies + | |
742 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); | |
c8d56ae7 EL |
743 | } |
744 | ||
632c016a | 745 | exit: |
c8d56ae7 EL |
746 | device_unlock(&dev->dev); |
747 | } | |
748 | ||
749 | static void nfc_check_pres_timeout(unsigned long data) | |
750 | { | |
751 | struct nfc_dev *dev = (struct nfc_dev *)data; | |
752 | ||
916082b0 | 753 | schedule_work(&dev->check_pres_work); |
c8d56ae7 EL |
754 | } |
755 | ||
3e256b8f LRV |
756 | struct class nfc_class = { |
757 | .name = "nfc", | |
758 | .dev_release = nfc_release, | |
759 | }; | |
760 | EXPORT_SYMBOL(nfc_class); | |
761 | ||
9f3b795a | 762 | static int match_idx(struct device *d, const void *data) |
3e256b8f LRV |
763 | { |
764 | struct nfc_dev *dev = to_nfc_dev(d); | |
9f3b795a | 765 | const unsigned int *idx = data; |
3e256b8f LRV |
766 | |
767 | return dev->idx == *idx; | |
768 | } | |
769 | ||
95c96174 | 770 | struct nfc_dev *nfc_get_device(unsigned int idx) |
3e256b8f LRV |
771 | { |
772 | struct device *d; | |
773 | ||
774 | d = class_find_device(&nfc_class, NULL, &idx, match_idx); | |
775 | if (!d) | |
776 | return NULL; | |
777 | ||
778 | return to_nfc_dev(d); | |
779 | } | |
780 | ||
781 | /** | |
782 | * nfc_allocate_device - allocate a new nfc device | |
783 | * | |
784 | * @ops: device operations | |
785 | * @supported_protocols: NFC protocols supported by the device | |
786 | */ | |
787 | struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, | |
0a40acb2 | 788 | u32 supported_protocols, |
390a1bd8 | 789 | u32 supported_se, |
0a40acb2 | 790 | int tx_headroom, int tx_tailroom) |
3e256b8f | 791 | { |
3e256b8f LRV |
792 | struct nfc_dev *dev; |
793 | ||
794 | if (!ops->start_poll || !ops->stop_poll || !ops->activate_target || | |
be9ae4ce | 795 | !ops->deactivate_target || !ops->im_transceive) |
3e256b8f LRV |
796 | return NULL; |
797 | ||
798 | if (!supported_protocols) | |
799 | return NULL; | |
800 | ||
801 | dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL); | |
802 | if (!dev) | |
803 | return NULL; | |
804 | ||
3e256b8f LRV |
805 | dev->ops = ops; |
806 | dev->supported_protocols = supported_protocols; | |
390a1bd8 SO |
807 | dev->supported_se = supported_se; |
808 | dev->active_se = NFC_SE_NONE; | |
e8753043 SO |
809 | dev->tx_headroom = tx_headroom; |
810 | dev->tx_tailroom = tx_tailroom; | |
3e256b8f | 811 | |
4d12b8b1 LRV |
812 | nfc_genl_data_init(&dev->genl_data); |
813 | ||
5bcf099c | 814 | dev->rf_mode = NFC_RF_NONE; |
d4ccb132 | 815 | |
4d12b8b1 LRV |
816 | /* first generation must not be 0 */ |
817 | dev->targets_generation = 1; | |
818 | ||
c8d56ae7 | 819 | if (ops->check_presence) { |
c8d56ae7 EL |
820 | init_timer(&dev->check_pres_timer); |
821 | dev->check_pres_timer.data = (unsigned long)dev; | |
822 | dev->check_pres_timer.function = nfc_check_pres_timeout; | |
823 | ||
824 | INIT_WORK(&dev->check_pres_work, nfc_check_pres_work); | |
c8d56ae7 EL |
825 | } |
826 | ||
3e256b8f LRV |
827 | return dev; |
828 | } | |
829 | EXPORT_SYMBOL(nfc_allocate_device); | |
830 | ||
831 | /** | |
832 | * nfc_register_device - register a nfc device in the nfc subsystem | |
833 | * | |
834 | * @dev: The nfc device to register | |
835 | */ | |
836 | int nfc_register_device(struct nfc_dev *dev) | |
837 | { | |
838 | int rc; | |
839 | ||
20c239c1 | 840 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f | 841 | |
7eda8b8e SO |
842 | dev->idx = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL); |
843 | if (dev->idx < 0) | |
844 | return dev->idx; | |
845 | ||
846 | dev->dev.class = &nfc_class; | |
847 | dev_set_name(&dev->dev, "nfc%d", dev->idx); | |
848 | device_initialize(&dev->dev); | |
849 | ||
3e256b8f LRV |
850 | mutex_lock(&nfc_devlist_mutex); |
851 | nfc_devlist_generation++; | |
852 | rc = device_add(&dev->dev); | |
853 | mutex_unlock(&nfc_devlist_mutex); | |
854 | ||
4d12b8b1 LRV |
855 | if (rc < 0) |
856 | return rc; | |
857 | ||
d646960f SO |
858 | rc = nfc_llcp_register_device(dev); |
859 | if (rc) | |
860 | pr_err("Could not register llcp device\n"); | |
861 | ||
4d12b8b1 LRV |
862 | rc = nfc_genl_device_added(dev); |
863 | if (rc) | |
20c239c1 JP |
864 | pr_debug("The userspace won't be notified that the device %s was added\n", |
865 | dev_name(&dev->dev)); | |
4d12b8b1 | 866 | |
be055b2f SO |
867 | dev->rfkill = rfkill_alloc(dev_name(&dev->dev), &dev->dev, |
868 | RFKILL_TYPE_NFC, &nfc_rfkill_ops, dev); | |
869 | if (dev->rfkill) { | |
870 | if (rfkill_register(dev->rfkill) < 0) { | |
871 | rfkill_destroy(dev->rfkill); | |
872 | dev->rfkill = NULL; | |
873 | } | |
874 | } | |
875 | ||
4d12b8b1 | 876 | return 0; |
3e256b8f LRV |
877 | } |
878 | EXPORT_SYMBOL(nfc_register_device); | |
879 | ||
880 | /** | |
881 | * nfc_unregister_device - unregister a nfc device in the nfc subsystem | |
882 | * | |
883 | * @dev: The nfc device to unregister | |
884 | */ | |
885 | void nfc_unregister_device(struct nfc_dev *dev) | |
886 | { | |
7eda8b8e | 887 | int rc, id; |
4d12b8b1 | 888 | |
20c239c1 | 889 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f | 890 | |
7eda8b8e SO |
891 | id = dev->idx; |
892 | ||
be055b2f SO |
893 | if (dev->rfkill) { |
894 | rfkill_unregister(dev->rfkill); | |
895 | rfkill_destroy(dev->rfkill); | |
896 | } | |
897 | ||
f0c91038 EL |
898 | if (dev->ops->check_presence) { |
899 | device_lock(&dev->dev); | |
900 | dev->shutting_down = true; | |
901 | device_unlock(&dev->dev); | |
902 | del_timer_sync(&dev->check_pres_timer); | |
903 | cancel_work_sync(&dev->check_pres_work); | |
904 | } | |
3e256b8f | 905 | |
f0c91038 EL |
906 | rc = nfc_genl_device_removed(dev); |
907 | if (rc) | |
908 | pr_debug("The userspace won't be notified that the device %s " | |
909 | "was removed\n", dev_name(&dev->dev)); | |
4d12b8b1 | 910 | |
d646960f SO |
911 | nfc_llcp_unregister_device(dev); |
912 | ||
f0c91038 EL |
913 | mutex_lock(&nfc_devlist_mutex); |
914 | nfc_devlist_generation++; | |
915 | device_del(&dev->dev); | |
916 | mutex_unlock(&nfc_devlist_mutex); | |
4d12b8b1 | 917 | |
7eda8b8e | 918 | ida_simple_remove(&nfc_index_ida, id); |
3e256b8f LRV |
919 | } |
920 | EXPORT_SYMBOL(nfc_unregister_device); | |
921 | ||
922 | static int __init nfc_init(void) | |
923 | { | |
4d12b8b1 LRV |
924 | int rc; |
925 | ||
ed1e0ad8 | 926 | pr_info("NFC Core ver %s\n", VERSION); |
3e256b8f | 927 | |
4d12b8b1 LRV |
928 | rc = class_register(&nfc_class); |
929 | if (rc) | |
930 | return rc; | |
931 | ||
932 | rc = nfc_genl_init(); | |
933 | if (rc) | |
934 | goto err_genl; | |
935 | ||
936 | /* the first generation must not be 0 */ | |
937 | nfc_devlist_generation = 1; | |
938 | ||
23b7869c LRV |
939 | rc = rawsock_init(); |
940 | if (rc) | |
941 | goto err_rawsock; | |
942 | ||
d646960f SO |
943 | rc = nfc_llcp_init(); |
944 | if (rc) | |
945 | goto err_llcp_sock; | |
946 | ||
c7fe3b52 AAJ |
947 | rc = af_nfc_init(); |
948 | if (rc) | |
949 | goto err_af_nfc; | |
950 | ||
4d12b8b1 LRV |
951 | return 0; |
952 | ||
c7fe3b52 | 953 | err_af_nfc: |
d646960f SO |
954 | nfc_llcp_exit(); |
955 | err_llcp_sock: | |
23b7869c LRV |
956 | rawsock_exit(); |
957 | err_rawsock: | |
c7fe3b52 | 958 | nfc_genl_exit(); |
4d12b8b1 LRV |
959 | err_genl: |
960 | class_unregister(&nfc_class); | |
961 | return rc; | |
3e256b8f LRV |
962 | } |
963 | ||
964 | static void __exit nfc_exit(void) | |
965 | { | |
c7fe3b52 | 966 | af_nfc_exit(); |
d646960f | 967 | nfc_llcp_exit(); |
23b7869c | 968 | rawsock_exit(); |
4d12b8b1 | 969 | nfc_genl_exit(); |
3e256b8f LRV |
970 | class_unregister(&nfc_class); |
971 | } | |
972 | ||
973 | subsys_initcall(nfc_init); | |
974 | module_exit(nfc_exit); | |
975 | ||
976 | MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); | |
977 | MODULE_DESCRIPTION("NFC Core ver " VERSION); | |
978 | MODULE_VERSION(VERSION); | |
979 | MODULE_LICENSE("GPL"); | |
1155bb61 | 980 | MODULE_ALIAS_NETPROTO(PF_NFC); |
5df16cad | 981 | MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME); |