Commit | Line | Data |
---|---|---|
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 | ||
9674da87 EL |
47 | int nfc_fw_upload(struct nfc_dev *dev, const char *firmware_name) |
48 | { | |
49 | int rc = 0; | |
50 | ||
51 | pr_debug("%s do firmware %s\n", dev_name(&dev->dev), firmware_name); | |
52 | ||
53 | device_lock(&dev->dev); | |
54 | ||
55 | if (!device_is_registered(&dev->dev)) { | |
56 | rc = -ENODEV; | |
57 | goto error; | |
58 | } | |
59 | ||
60 | if (dev->dev_up) { | |
61 | rc = -EBUSY; | |
62 | goto error; | |
63 | } | |
64 | ||
65 | if (!dev->ops->fw_upload) { | |
66 | rc = -EOPNOTSUPP; | |
67 | goto error; | |
68 | } | |
69 | ||
70 | dev->fw_upload_in_progress = true; | |
71 | rc = dev->ops->fw_upload(dev, firmware_name); | |
72 | if (rc) | |
73 | dev->fw_upload_in_progress = false; | |
74 | ||
75 | error: | |
76 | device_unlock(&dev->dev); | |
77 | return rc; | |
78 | } | |
79 | ||
80 | int nfc_fw_upload_done(struct nfc_dev *dev, const char *firmware_name) | |
81 | { | |
82 | dev->fw_upload_in_progress = false; | |
83 | ||
84 | return nfc_genl_fw_upload_done(dev, firmware_name); | |
85 | } | |
86 | EXPORT_SYMBOL(nfc_fw_upload_done); | |
87 | ||
8b3fe7b5 IE |
88 | /** |
89 | * nfc_dev_up - turn on the NFC device | |
90 | * | |
91 | * @dev: The nfc device to be turned on | |
92 | * | |
93 | * The device remains up until the nfc_dev_down function is called. | |
94 | */ | |
95 | int nfc_dev_up(struct nfc_dev *dev) | |
96 | { | |
97 | int rc = 0; | |
98 | ||
20c239c1 | 99 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
8b3fe7b5 IE |
100 | |
101 | device_lock(&dev->dev); | |
102 | ||
be055b2f SO |
103 | if (dev->rfkill && rfkill_blocked(dev->rfkill)) { |
104 | rc = -ERFKILL; | |
105 | goto error; | |
106 | } | |
107 | ||
8b3fe7b5 IE |
108 | if (!device_is_registered(&dev->dev)) { |
109 | rc = -ENODEV; | |
110 | goto error; | |
111 | } | |
112 | ||
9674da87 EL |
113 | if (dev->fw_upload_in_progress) { |
114 | rc = -EBUSY; | |
115 | goto error; | |
116 | } | |
117 | ||
8b3fe7b5 IE |
118 | if (dev->dev_up) { |
119 | rc = -EALREADY; | |
120 | goto error; | |
121 | } | |
122 | ||
123 | if (dev->ops->dev_up) | |
124 | rc = dev->ops->dev_up(dev); | |
125 | ||
126 | if (!rc) | |
127 | dev->dev_up = true; | |
128 | ||
0a946301 SO |
129 | /* We have to enable the device before discovering SEs */ |
130 | if (dev->ops->discover_se) { | |
131 | rc = dev->ops->discover_se(dev); | |
132 | if (!rc) | |
133 | pr_warn("SE discovery failed\n"); | |
134 | } | |
135 | ||
8b3fe7b5 IE |
136 | error: |
137 | device_unlock(&dev->dev); | |
138 | return rc; | |
139 | } | |
140 | ||
141 | /** | |
142 | * nfc_dev_down - turn off the NFC device | |
143 | * | |
144 | * @dev: The nfc device to be turned off | |
145 | */ | |
146 | int nfc_dev_down(struct nfc_dev *dev) | |
147 | { | |
148 | int rc = 0; | |
149 | ||
20c239c1 | 150 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
8b3fe7b5 IE |
151 | |
152 | device_lock(&dev->dev); | |
153 | ||
154 | if (!device_is_registered(&dev->dev)) { | |
155 | rc = -ENODEV; | |
156 | goto error; | |
157 | } | |
158 | ||
159 | if (!dev->dev_up) { | |
160 | rc = -EALREADY; | |
161 | goto error; | |
162 | } | |
163 | ||
90099433 | 164 | if (dev->polling || dev->active_target) { |
8b3fe7b5 IE |
165 | rc = -EBUSY; |
166 | goto error; | |
167 | } | |
168 | ||
169 | if (dev->ops->dev_down) | |
170 | dev->ops->dev_down(dev); | |
171 | ||
172 | dev->dev_up = false; | |
173 | ||
174 | error: | |
175 | device_unlock(&dev->dev); | |
176 | return rc; | |
177 | } | |
178 | ||
be055b2f SO |
179 | static int nfc_rfkill_set_block(void *data, bool blocked) |
180 | { | |
181 | struct nfc_dev *dev = data; | |
182 | ||
183 | pr_debug("%s blocked %d", dev_name(&dev->dev), blocked); | |
184 | ||
185 | if (!blocked) | |
186 | return 0; | |
187 | ||
188 | nfc_dev_down(dev); | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | static const struct rfkill_ops nfc_rfkill_ops = { | |
194 | .set_block = nfc_rfkill_set_block, | |
195 | }; | |
196 | ||
3e256b8f LRV |
197 | /** |
198 | * nfc_start_poll - start polling for nfc targets | |
199 | * | |
200 | * @dev: The nfc device that must start polling | |
201 | * @protocols: bitset of nfc protocols that must be used for polling | |
202 | * | |
203 | * The device remains polling for targets until a target is found or | |
204 | * the nfc_stop_poll function is called. | |
205 | */ | |
fe7c5800 | 206 | int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols) |
3e256b8f LRV |
207 | { |
208 | int rc; | |
209 | ||
fe7c5800 SO |
210 | pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n", |
211 | dev_name(&dev->dev), im_protocols, tm_protocols); | |
3e256b8f | 212 | |
fe7c5800 | 213 | if (!im_protocols && !tm_protocols) |
3e256b8f LRV |
214 | return -EINVAL; |
215 | ||
216 | device_lock(&dev->dev); | |
217 | ||
218 | if (!device_is_registered(&dev->dev)) { | |
219 | rc = -ENODEV; | |
220 | goto error; | |
221 | } | |
222 | ||
7757dc8a SO |
223 | if (!dev->dev_up) { |
224 | rc = -ENODEV; | |
225 | goto error; | |
226 | } | |
227 | ||
3e256b8f LRV |
228 | if (dev->polling) { |
229 | rc = -EBUSY; | |
230 | goto error; | |
231 | } | |
232 | ||
fe7c5800 | 233 | rc = dev->ops->start_poll(dev, im_protocols, tm_protocols); |
f212ad5e | 234 | if (!rc) { |
3e256b8f | 235 | dev->polling = true; |
f212ad5e SO |
236 | dev->rf_mode = NFC_RF_NONE; |
237 | } | |
3e256b8f LRV |
238 | |
239 | error: | |
240 | device_unlock(&dev->dev); | |
241 | return rc; | |
242 | } | |
243 | ||
244 | /** | |
245 | * nfc_stop_poll - stop polling for nfc targets | |
246 | * | |
247 | * @dev: The nfc device that must stop polling | |
248 | */ | |
249 | int nfc_stop_poll(struct nfc_dev *dev) | |
250 | { | |
251 | int rc = 0; | |
252 | ||
20c239c1 | 253 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f LRV |
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->polling) { | |
263 | rc = -EINVAL; | |
264 | goto error; | |
265 | } | |
266 | ||
267 | dev->ops->stop_poll(dev); | |
268 | dev->polling = false; | |
5bcf099c | 269 | dev->rf_mode = NFC_RF_NONE; |
3e256b8f LRV |
270 | |
271 | error: | |
272 | device_unlock(&dev->dev); | |
273 | return rc; | |
274 | } | |
275 | ||
90099433 EL |
276 | static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx) |
277 | { | |
278 | int i; | |
279 | ||
280 | if (dev->n_targets == 0) | |
281 | return NULL; | |
282 | ||
0f450772 | 283 | for (i = 0; i < dev->n_targets; i++) { |
90099433 EL |
284 | if (dev->targets[i].idx == target_idx) |
285 | return &dev->targets[i]; | |
286 | } | |
287 | ||
288 | return NULL; | |
289 | } | |
290 | ||
47807d3d | 291 | int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode) |
1ed28f61 SO |
292 | { |
293 | int rc = 0; | |
47807d3d SO |
294 | u8 *gb; |
295 | size_t gb_len; | |
90099433 | 296 | struct nfc_target *target; |
1ed28f61 | 297 | |
47807d3d | 298 | pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode); |
1ed28f61 SO |
299 | |
300 | if (!dev->ops->dep_link_up) | |
301 | return -EOPNOTSUPP; | |
302 | ||
303 | device_lock(&dev->dev); | |
304 | ||
305 | if (!device_is_registered(&dev->dev)) { | |
306 | rc = -ENODEV; | |
307 | goto error; | |
308 | } | |
309 | ||
310 | if (dev->dep_link_up == true) { | |
311 | rc = -EALREADY; | |
312 | goto error; | |
313 | } | |
314 | ||
47807d3d SO |
315 | gb = nfc_llcp_general_bytes(dev, &gb_len); |
316 | if (gb_len > NFC_MAX_GT_LEN) { | |
317 | rc = -EINVAL; | |
318 | goto error; | |
319 | } | |
320 | ||
90099433 EL |
321 | target = nfc_find_target(dev, target_index); |
322 | if (target == NULL) { | |
323 | rc = -ENOTCONN; | |
324 | goto error; | |
325 | } | |
326 | ||
327 | rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len); | |
f212ad5e | 328 | if (!rc) { |
90099433 | 329 | dev->active_target = target; |
f212ad5e SO |
330 | dev->rf_mode = NFC_RF_INITIATOR; |
331 | } | |
1ed28f61 SO |
332 | |
333 | error: | |
334 | device_unlock(&dev->dev); | |
335 | return rc; | |
336 | } | |
337 | ||
338 | int nfc_dep_link_down(struct nfc_dev *dev) | |
339 | { | |
340 | int rc = 0; | |
341 | ||
342 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); | |
343 | ||
344 | if (!dev->ops->dep_link_down) | |
345 | return -EOPNOTSUPP; | |
346 | ||
347 | device_lock(&dev->dev); | |
348 | ||
349 | if (!device_is_registered(&dev->dev)) { | |
350 | rc = -ENODEV; | |
351 | goto error; | |
352 | } | |
353 | ||
354 | if (dev->dep_link_up == false) { | |
355 | rc = -EALREADY; | |
356 | goto error; | |
357 | } | |
358 | ||
1ed28f61 SO |
359 | rc = dev->ops->dep_link_down(dev); |
360 | if (!rc) { | |
361 | dev->dep_link_up = false; | |
90099433 | 362 | dev->active_target = NULL; |
5bcf099c | 363 | dev->rf_mode = NFC_RF_NONE; |
d646960f | 364 | nfc_llcp_mac_is_down(dev); |
1ed28f61 SO |
365 | nfc_genl_dep_link_down_event(dev); |
366 | } | |
367 | ||
368 | error: | |
369 | device_unlock(&dev->dev); | |
5bcf099c | 370 | |
1ed28f61 SO |
371 | return rc; |
372 | } | |
373 | ||
374 | int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, | |
0a40acb2 | 375 | u8 comm_mode, u8 rf_mode) |
1ed28f61 SO |
376 | { |
377 | dev->dep_link_up = true; | |
1ed28f61 | 378 | |
d646960f SO |
379 | nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode); |
380 | ||
1ed28f61 SO |
381 | return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode); |
382 | } | |
383 | EXPORT_SYMBOL(nfc_dep_link_is_up); | |
384 | ||
3e256b8f LRV |
385 | /** |
386 | * nfc_activate_target - prepare the target for data exchange | |
387 | * | |
388 | * @dev: The nfc device that found the target | |
389 | * @target_idx: index of the target that must be activated | |
390 | * @protocol: nfc protocol that will be used for data exchange | |
391 | */ | |
392 | int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol) | |
393 | { | |
394 | int rc; | |
90099433 | 395 | struct nfc_target *target; |
3e256b8f | 396 | |
20c239c1 JP |
397 | pr_debug("dev_name=%s target_idx=%u protocol=%u\n", |
398 | dev_name(&dev->dev), target_idx, protocol); | |
3e256b8f LRV |
399 | |
400 | device_lock(&dev->dev); | |
401 | ||
402 | if (!device_is_registered(&dev->dev)) { | |
403 | rc = -ENODEV; | |
404 | goto error; | |
405 | } | |
406 | ||
90099433 EL |
407 | if (dev->active_target) { |
408 | rc = -EBUSY; | |
409 | goto error; | |
410 | } | |
411 | ||
412 | target = nfc_find_target(dev, target_idx); | |
413 | if (target == NULL) { | |
414 | rc = -ENOTCONN; | |
415 | goto error; | |
416 | } | |
417 | ||
418 | rc = dev->ops->activate_target(dev, target, protocol); | |
c8d56ae7 | 419 | if (!rc) { |
90099433 | 420 | dev->active_target = target; |
f212ad5e | 421 | dev->rf_mode = NFC_RF_INITIATOR; |
3e256b8f | 422 | |
f0c91038 | 423 | if (dev->ops->check_presence && !dev->shutting_down) |
c8d56ae7 EL |
424 | mod_timer(&dev->check_pres_timer, jiffies + |
425 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); | |
426 | } | |
3e256b8f LRV |
427 | |
428 | error: | |
429 | device_unlock(&dev->dev); | |
430 | return rc; | |
431 | } | |
432 | ||
433 | /** | |
434 | * nfc_deactivate_target - deactivate a nfc target | |
435 | * | |
436 | * @dev: The nfc device that found the target | |
437 | * @target_idx: index of the target that must be deactivated | |
438 | */ | |
439 | int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx) | |
440 | { | |
441 | int rc = 0; | |
442 | ||
20c239c1 JP |
443 | pr_debug("dev_name=%s target_idx=%u\n", |
444 | dev_name(&dev->dev), target_idx); | |
3e256b8f LRV |
445 | |
446 | device_lock(&dev->dev); | |
447 | ||
448 | if (!device_is_registered(&dev->dev)) { | |
449 | rc = -ENODEV; | |
450 | goto error; | |
451 | } | |
452 | ||
90099433 EL |
453 | if (dev->active_target == NULL) { |
454 | rc = -ENOTCONN; | |
455 | goto error; | |
456 | } | |
457 | ||
458 | if (dev->active_target->idx != target_idx) { | |
459 | rc = -ENOTCONN; | |
460 | goto error; | |
461 | } | |
462 | ||
c8d56ae7 EL |
463 | if (dev->ops->check_presence) |
464 | del_timer_sync(&dev->check_pres_timer); | |
465 | ||
90099433 EL |
466 | dev->ops->deactivate_target(dev, dev->active_target); |
467 | dev->active_target = NULL; | |
3e256b8f LRV |
468 | |
469 | error: | |
470 | device_unlock(&dev->dev); | |
471 | return rc; | |
472 | } | |
473 | ||
474 | /** | |
475 | * nfc_data_exchange - transceive data | |
476 | * | |
477 | * @dev: The nfc device that found the target | |
478 | * @target_idx: index of the target | |
479 | * @skb: data to be sent | |
480 | * @cb: callback called when the response is received | |
481 | * @cb_context: parameter for the callback function | |
482 | * | |
483 | * The user must wait for the callback before calling this function again. | |
484 | */ | |
0a40acb2 SO |
485 | int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb, |
486 | data_exchange_cb_t cb, void *cb_context) | |
3e256b8f LRV |
487 | { |
488 | int rc; | |
489 | ||
20c239c1 JP |
490 | pr_debug("dev_name=%s target_idx=%u skb->len=%u\n", |
491 | dev_name(&dev->dev), target_idx, skb->len); | |
3e256b8f LRV |
492 | |
493 | device_lock(&dev->dev); | |
494 | ||
495 | if (!device_is_registered(&dev->dev)) { | |
496 | rc = -ENODEV; | |
497 | kfree_skb(skb); | |
498 | goto error; | |
499 | } | |
500 | ||
be9ae4ce SO |
501 | if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) { |
502 | if (dev->active_target->idx != target_idx) { | |
503 | rc = -EADDRNOTAVAIL; | |
504 | kfree_skb(skb); | |
505 | goto error; | |
506 | } | |
144612ca | 507 | |
be9ae4ce SO |
508 | if (dev->ops->check_presence) |
509 | del_timer_sync(&dev->check_pres_timer); | |
510 | ||
511 | rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb, | |
512 | cb_context); | |
513 | ||
f0c91038 | 514 | if (!rc && dev->ops->check_presence && !dev->shutting_down) |
be9ae4ce SO |
515 | mod_timer(&dev->check_pres_timer, jiffies + |
516 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); | |
517 | } else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) { | |
518 | rc = dev->ops->tm_send(dev, skb); | |
519 | } else { | |
520 | rc = -ENOTCONN; | |
144612ca EL |
521 | kfree_skb(skb); |
522 | goto error; | |
523 | } | |
524 | ||
c8d56ae7 | 525 | |
3e256b8f LRV |
526 | error: |
527 | device_unlock(&dev->dev); | |
528 | return rc; | |
529 | } | |
530 | ||
541d920b SO |
531 | int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len) |
532 | { | |
0a40acb2 | 533 | pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len); |
541d920b SO |
534 | |
535 | if (gb_len > NFC_MAX_GT_LEN) | |
536 | return -EINVAL; | |
537 | ||
d646960f | 538 | return nfc_llcp_set_remote_gb(dev, gb, gb_len); |
541d920b SO |
539 | } |
540 | EXPORT_SYMBOL(nfc_set_remote_general_bytes); | |
541 | ||
ab73b751 SO |
542 | u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len) |
543 | { | |
544 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); | |
545 | ||
546 | return nfc_llcp_general_bytes(dev, gb_len); | |
547 | } | |
548 | EXPORT_SYMBOL(nfc_get_local_general_bytes); | |
549 | ||
73167ced SO |
550 | int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb) |
551 | { | |
552 | /* Only LLCP target mode for now */ | |
553 | if (dev->dep_link_up == false) { | |
554 | kfree_skb(skb); | |
555 | return -ENOLINK; | |
556 | } | |
557 | ||
558 | return nfc_llcp_data_received(dev, skb); | |
559 | } | |
560 | EXPORT_SYMBOL(nfc_tm_data_received); | |
561 | ||
fc40a8c1 SO |
562 | int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode, |
563 | u8 *gb, size_t gb_len) | |
564 | { | |
565 | int rc; | |
566 | ||
567 | device_lock(&dev->dev); | |
568 | ||
569 | dev->polling = false; | |
570 | ||
571 | if (gb != NULL) { | |
572 | rc = nfc_set_remote_general_bytes(dev, gb, gb_len); | |
573 | if (rc < 0) | |
574 | goto out; | |
575 | } | |
576 | ||
f212ad5e SO |
577 | dev->rf_mode = NFC_RF_TARGET; |
578 | ||
fc40a8c1 SO |
579 | if (protocol == NFC_PROTO_NFC_DEP_MASK) |
580 | nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET); | |
581 | ||
582 | rc = nfc_genl_tm_activated(dev, protocol); | |
583 | ||
584 | out: | |
585 | device_unlock(&dev->dev); | |
586 | ||
587 | return rc; | |
588 | } | |
589 | EXPORT_SYMBOL(nfc_tm_activated); | |
590 | ||
591 | int nfc_tm_deactivated(struct nfc_dev *dev) | |
592 | { | |
593 | dev->dep_link_up = false; | |
5bcf099c | 594 | dev->rf_mode = NFC_RF_NONE; |
fc40a8c1 SO |
595 | |
596 | return nfc_genl_tm_deactivated(dev); | |
597 | } | |
598 | EXPORT_SYMBOL(nfc_tm_deactivated); | |
599 | ||
3e256b8f | 600 | /** |
7c7cd3bf | 601 | * nfc_alloc_send_skb - allocate a skb for data exchange responses |
3e256b8f LRV |
602 | * |
603 | * @size: size to allocate | |
604 | * @gfp: gfp flags | |
605 | */ | |
7c7cd3bf | 606 | struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk, |
0a40acb2 SO |
607 | unsigned int flags, unsigned int size, |
608 | unsigned int *err) | |
7c7cd3bf SO |
609 | { |
610 | struct sk_buff *skb; | |
611 | unsigned int total_size; | |
612 | ||
613 | total_size = size + | |
614 | dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
615 | ||
616 | skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err); | |
617 | if (skb) | |
618 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
619 | ||
620 | return skb; | |
621 | } | |
622 | ||
623 | /** | |
624 | * nfc_alloc_recv_skb - allocate a skb for data exchange responses | |
625 | * | |
626 | * @size: size to allocate | |
627 | * @gfp: gfp flags | |
628 | */ | |
629 | struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp) | |
3e256b8f LRV |
630 | { |
631 | struct sk_buff *skb; | |
632 | unsigned int total_size; | |
633 | ||
634 | total_size = size + 1; | |
635 | skb = alloc_skb(total_size, gfp); | |
636 | ||
637 | if (skb) | |
638 | skb_reserve(skb, 1); | |
639 | ||
640 | return skb; | |
641 | } | |
7c7cd3bf | 642 | EXPORT_SYMBOL(nfc_alloc_recv_skb); |
3e256b8f | 643 | |
4d12b8b1 LRV |
644 | /** |
645 | * nfc_targets_found - inform that targets were found | |
646 | * | |
647 | * @dev: The nfc device that found the targets | |
648 | * @targets: array of nfc targets found | |
649 | * @ntargets: targets array size | |
650 | * | |
651 | * The device driver must call this function when one or many nfc targets | |
652 | * are found. After calling this function, the device driver must stop | |
653 | * polling for targets. | |
d94f9c55 EL |
654 | * NOTE: This function can be called with targets=NULL and n_targets=0 to |
655 | * notify a driver error, meaning that the polling operation cannot complete. | |
d4ccb132 EL |
656 | * IMPORTANT: this function must not be called from an atomic context. |
657 | * In addition, it must also not be called from a context that would prevent | |
658 | * the NFC Core to call other nfc ops entry point concurrently. | |
4d12b8b1 | 659 | */ |
0a40acb2 SO |
660 | int nfc_targets_found(struct nfc_dev *dev, |
661 | struct nfc_target *targets, int n_targets) | |
4d12b8b1 | 662 | { |
c4fbb651 SO |
663 | int i; |
664 | ||
20c239c1 | 665 | pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets); |
4d12b8b1 | 666 | |
c4fbb651 | 667 | for (i = 0; i < n_targets; i++) |
01ae0eea | 668 | targets[i].idx = dev->target_next_idx++; |
c4fbb651 | 669 | |
d4ccb132 | 670 | device_lock(&dev->dev); |
4d12b8b1 | 671 | |
8668fdd6 EL |
672 | if (dev->polling == false) { |
673 | device_unlock(&dev->dev); | |
674 | return 0; | |
675 | } | |
676 | ||
677 | dev->polling = false; | |
678 | ||
4d12b8b1 LRV |
679 | dev->targets_generation++; |
680 | ||
681 | kfree(dev->targets); | |
d94f9c55 | 682 | dev->targets = NULL; |
4d12b8b1 | 683 | |
d94f9c55 EL |
684 | if (targets) { |
685 | dev->targets = kmemdup(targets, | |
686 | n_targets * sizeof(struct nfc_target), | |
687 | GFP_ATOMIC); | |
688 | ||
689 | if (!dev->targets) { | |
690 | dev->n_targets = 0; | |
691 | device_unlock(&dev->dev); | |
692 | return -ENOMEM; | |
693 | } | |
4d12b8b1 LRV |
694 | } |
695 | ||
696 | dev->n_targets = n_targets; | |
d4ccb132 | 697 | device_unlock(&dev->dev); |
4d12b8b1 LRV |
698 | |
699 | nfc_genl_targets_found(dev); | |
700 | ||
701 | return 0; | |
702 | } | |
703 | EXPORT_SYMBOL(nfc_targets_found); | |
704 | ||
d4ccb132 EL |
705 | /** |
706 | * nfc_target_lost - inform that an activated target went out of field | |
707 | * | |
708 | * @dev: The nfc device that had the activated target in field | |
709 | * @target_idx: the nfc index of the target | |
710 | * | |
711 | * The device driver must call this function when the activated target | |
712 | * goes out of the field. | |
713 | * IMPORTANT: this function must not be called from an atomic context. | |
714 | * In addition, it must also not be called from a context that would prevent | |
715 | * the NFC Core to call other nfc ops entry point concurrently. | |
716 | */ | |
e1da0efa EL |
717 | int nfc_target_lost(struct nfc_dev *dev, u32 target_idx) |
718 | { | |
719 | struct nfc_target *tg; | |
720 | int i; | |
721 | ||
722 | pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx); | |
723 | ||
d4ccb132 | 724 | device_lock(&dev->dev); |
e1da0efa EL |
725 | |
726 | for (i = 0; i < dev->n_targets; i++) { | |
727 | tg = &dev->targets[i]; | |
728 | if (tg->idx == target_idx) | |
729 | break; | |
730 | } | |
731 | ||
732 | if (i == dev->n_targets) { | |
d4ccb132 | 733 | device_unlock(&dev->dev); |
e1da0efa EL |
734 | return -EINVAL; |
735 | } | |
736 | ||
737 | dev->targets_generation++; | |
738 | dev->n_targets--; | |
90099433 | 739 | dev->active_target = NULL; |
e1da0efa EL |
740 | |
741 | if (dev->n_targets) { | |
742 | memcpy(&dev->targets[i], &dev->targets[i + 1], | |
743 | (dev->n_targets - i) * sizeof(struct nfc_target)); | |
744 | } else { | |
745 | kfree(dev->targets); | |
746 | dev->targets = NULL; | |
747 | } | |
748 | ||
d4ccb132 | 749 | device_unlock(&dev->dev); |
e1da0efa EL |
750 | |
751 | nfc_genl_target_lost(dev, target_idx); | |
752 | ||
753 | return 0; | |
754 | } | |
755 | EXPORT_SYMBOL(nfc_target_lost); | |
756 | ||
9eb334ac | 757 | inline void nfc_driver_failure(struct nfc_dev *dev, int err) |
456411ca | 758 | { |
9eb334ac | 759 | nfc_targets_found(dev, NULL, 0); |
456411ca EL |
760 | } |
761 | EXPORT_SYMBOL(nfc_driver_failure); | |
762 | ||
3e256b8f LRV |
763 | static void nfc_release(struct device *d) |
764 | { | |
765 | struct nfc_dev *dev = to_nfc_dev(d); | |
766 | ||
20c239c1 | 767 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f | 768 | |
4d12b8b1 LRV |
769 | nfc_genl_data_exit(&dev->genl_data); |
770 | kfree(dev->targets); | |
3e256b8f LRV |
771 | kfree(dev); |
772 | } | |
773 | ||
c8d56ae7 EL |
774 | static void nfc_check_pres_work(struct work_struct *work) |
775 | { | |
776 | struct nfc_dev *dev = container_of(work, struct nfc_dev, | |
777 | check_pres_work); | |
778 | int rc; | |
779 | ||
780 | device_lock(&dev->dev); | |
781 | ||
90099433 EL |
782 | if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) { |
783 | rc = dev->ops->check_presence(dev, dev->active_target); | |
632c016a EL |
784 | if (rc == -EOPNOTSUPP) |
785 | goto exit; | |
f0c91038 | 786 | if (rc) { |
d4ccb132 EL |
787 | u32 active_target_idx = dev->active_target->idx; |
788 | device_unlock(&dev->dev); | |
789 | nfc_target_lost(dev, active_target_idx); | |
790 | return; | |
c8d56ae7 | 791 | } |
f0c91038 EL |
792 | |
793 | if (!dev->shutting_down) | |
794 | mod_timer(&dev->check_pres_timer, jiffies + | |
795 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); | |
c8d56ae7 EL |
796 | } |
797 | ||
632c016a | 798 | exit: |
c8d56ae7 EL |
799 | device_unlock(&dev->dev); |
800 | } | |
801 | ||
802 | static void nfc_check_pres_timeout(unsigned long data) | |
803 | { | |
804 | struct nfc_dev *dev = (struct nfc_dev *)data; | |
805 | ||
916082b0 | 806 | schedule_work(&dev->check_pres_work); |
c8d56ae7 EL |
807 | } |
808 | ||
3e256b8f LRV |
809 | struct class nfc_class = { |
810 | .name = "nfc", | |
811 | .dev_release = nfc_release, | |
812 | }; | |
813 | EXPORT_SYMBOL(nfc_class); | |
814 | ||
9f3b795a | 815 | static int match_idx(struct device *d, const void *data) |
3e256b8f LRV |
816 | { |
817 | struct nfc_dev *dev = to_nfc_dev(d); | |
9f3b795a | 818 | const unsigned int *idx = data; |
3e256b8f LRV |
819 | |
820 | return dev->idx == *idx; | |
821 | } | |
822 | ||
95c96174 | 823 | struct nfc_dev *nfc_get_device(unsigned int idx) |
3e256b8f LRV |
824 | { |
825 | struct device *d; | |
826 | ||
827 | d = class_find_device(&nfc_class, NULL, &idx, match_idx); | |
828 | if (!d) | |
829 | return NULL; | |
830 | ||
831 | return to_nfc_dev(d); | |
832 | } | |
833 | ||
834 | /** | |
835 | * nfc_allocate_device - allocate a new nfc device | |
836 | * | |
837 | * @ops: device operations | |
838 | * @supported_protocols: NFC protocols supported by the device | |
839 | */ | |
840 | struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, | |
0a40acb2 SO |
841 | u32 supported_protocols, |
842 | int tx_headroom, int tx_tailroom) | |
3e256b8f | 843 | { |
3e256b8f LRV |
844 | struct nfc_dev *dev; |
845 | ||
846 | if (!ops->start_poll || !ops->stop_poll || !ops->activate_target || | |
be9ae4ce | 847 | !ops->deactivate_target || !ops->im_transceive) |
3e256b8f LRV |
848 | return NULL; |
849 | ||
850 | if (!supported_protocols) | |
851 | return NULL; | |
852 | ||
853 | dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL); | |
854 | if (!dev) | |
855 | return NULL; | |
856 | ||
3e256b8f LRV |
857 | dev->ops = ops; |
858 | dev->supported_protocols = supported_protocols; | |
390a1bd8 | 859 | dev->active_se = NFC_SE_NONE; |
e8753043 SO |
860 | dev->tx_headroom = tx_headroom; |
861 | dev->tx_tailroom = tx_tailroom; | |
3e256b8f | 862 | |
4d12b8b1 LRV |
863 | nfc_genl_data_init(&dev->genl_data); |
864 | ||
5bcf099c | 865 | dev->rf_mode = NFC_RF_NONE; |
d4ccb132 | 866 | |
4d12b8b1 LRV |
867 | /* first generation must not be 0 */ |
868 | dev->targets_generation = 1; | |
869 | ||
c8d56ae7 | 870 | if (ops->check_presence) { |
c8d56ae7 EL |
871 | init_timer(&dev->check_pres_timer); |
872 | dev->check_pres_timer.data = (unsigned long)dev; | |
873 | dev->check_pres_timer.function = nfc_check_pres_timeout; | |
874 | ||
875 | INIT_WORK(&dev->check_pres_work, nfc_check_pres_work); | |
c8d56ae7 EL |
876 | } |
877 | ||
3e256b8f LRV |
878 | return dev; |
879 | } | |
880 | EXPORT_SYMBOL(nfc_allocate_device); | |
881 | ||
882 | /** | |
883 | * nfc_register_device - register a nfc device in the nfc subsystem | |
884 | * | |
885 | * @dev: The nfc device to register | |
886 | */ | |
887 | int nfc_register_device(struct nfc_dev *dev) | |
888 | { | |
889 | int rc; | |
890 | ||
20c239c1 | 891 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f | 892 | |
7eda8b8e SO |
893 | dev->idx = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL); |
894 | if (dev->idx < 0) | |
895 | return dev->idx; | |
896 | ||
897 | dev->dev.class = &nfc_class; | |
898 | dev_set_name(&dev->dev, "nfc%d", dev->idx); | |
899 | device_initialize(&dev->dev); | |
900 | ||
3e256b8f LRV |
901 | mutex_lock(&nfc_devlist_mutex); |
902 | nfc_devlist_generation++; | |
903 | rc = device_add(&dev->dev); | |
904 | mutex_unlock(&nfc_devlist_mutex); | |
905 | ||
4d12b8b1 LRV |
906 | if (rc < 0) |
907 | return rc; | |
908 | ||
d646960f SO |
909 | rc = nfc_llcp_register_device(dev); |
910 | if (rc) | |
911 | pr_err("Could not register llcp device\n"); | |
912 | ||
4d12b8b1 LRV |
913 | rc = nfc_genl_device_added(dev); |
914 | if (rc) | |
20c239c1 JP |
915 | pr_debug("The userspace won't be notified that the device %s was added\n", |
916 | dev_name(&dev->dev)); | |
4d12b8b1 | 917 | |
be055b2f SO |
918 | dev->rfkill = rfkill_alloc(dev_name(&dev->dev), &dev->dev, |
919 | RFKILL_TYPE_NFC, &nfc_rfkill_ops, dev); | |
920 | if (dev->rfkill) { | |
921 | if (rfkill_register(dev->rfkill) < 0) { | |
922 | rfkill_destroy(dev->rfkill); | |
923 | dev->rfkill = NULL; | |
924 | } | |
925 | } | |
926 | ||
4d12b8b1 | 927 | return 0; |
3e256b8f LRV |
928 | } |
929 | EXPORT_SYMBOL(nfc_register_device); | |
930 | ||
931 | /** | |
932 | * nfc_unregister_device - unregister a nfc device in the nfc subsystem | |
933 | * | |
934 | * @dev: The nfc device to unregister | |
935 | */ | |
936 | void nfc_unregister_device(struct nfc_dev *dev) | |
937 | { | |
7eda8b8e | 938 | int rc, id; |
4d12b8b1 | 939 | |
20c239c1 | 940 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
3e256b8f | 941 | |
7eda8b8e SO |
942 | id = dev->idx; |
943 | ||
be055b2f SO |
944 | if (dev->rfkill) { |
945 | rfkill_unregister(dev->rfkill); | |
946 | rfkill_destroy(dev->rfkill); | |
947 | } | |
948 | ||
f0c91038 EL |
949 | if (dev->ops->check_presence) { |
950 | device_lock(&dev->dev); | |
951 | dev->shutting_down = true; | |
952 | device_unlock(&dev->dev); | |
953 | del_timer_sync(&dev->check_pres_timer); | |
954 | cancel_work_sync(&dev->check_pres_work); | |
955 | } | |
3e256b8f | 956 | |
f0c91038 EL |
957 | rc = nfc_genl_device_removed(dev); |
958 | if (rc) | |
959 | pr_debug("The userspace won't be notified that the device %s " | |
960 | "was removed\n", dev_name(&dev->dev)); | |
4d12b8b1 | 961 | |
d646960f SO |
962 | nfc_llcp_unregister_device(dev); |
963 | ||
f0c91038 EL |
964 | mutex_lock(&nfc_devlist_mutex); |
965 | nfc_devlist_generation++; | |
966 | device_del(&dev->dev); | |
967 | mutex_unlock(&nfc_devlist_mutex); | |
4d12b8b1 | 968 | |
7eda8b8e | 969 | ida_simple_remove(&nfc_index_ida, id); |
3e256b8f LRV |
970 | } |
971 | EXPORT_SYMBOL(nfc_unregister_device); | |
972 | ||
973 | static int __init nfc_init(void) | |
974 | { | |
4d12b8b1 LRV |
975 | int rc; |
976 | ||
ed1e0ad8 | 977 | pr_info("NFC Core ver %s\n", VERSION); |
3e256b8f | 978 | |
4d12b8b1 LRV |
979 | rc = class_register(&nfc_class); |
980 | if (rc) | |
981 | return rc; | |
982 | ||
983 | rc = nfc_genl_init(); | |
984 | if (rc) | |
985 | goto err_genl; | |
986 | ||
987 | /* the first generation must not be 0 */ | |
988 | nfc_devlist_generation = 1; | |
989 | ||
23b7869c LRV |
990 | rc = rawsock_init(); |
991 | if (rc) | |
992 | goto err_rawsock; | |
993 | ||
d646960f SO |
994 | rc = nfc_llcp_init(); |
995 | if (rc) | |
996 | goto err_llcp_sock; | |
997 | ||
c7fe3b52 AAJ |
998 | rc = af_nfc_init(); |
999 | if (rc) | |
1000 | goto err_af_nfc; | |
1001 | ||
4d12b8b1 LRV |
1002 | return 0; |
1003 | ||
c7fe3b52 | 1004 | err_af_nfc: |
d646960f SO |
1005 | nfc_llcp_exit(); |
1006 | err_llcp_sock: | |
23b7869c LRV |
1007 | rawsock_exit(); |
1008 | err_rawsock: | |
c7fe3b52 | 1009 | nfc_genl_exit(); |
4d12b8b1 LRV |
1010 | err_genl: |
1011 | class_unregister(&nfc_class); | |
1012 | return rc; | |
3e256b8f LRV |
1013 | } |
1014 | ||
1015 | static void __exit nfc_exit(void) | |
1016 | { | |
c7fe3b52 | 1017 | af_nfc_exit(); |
d646960f | 1018 | nfc_llcp_exit(); |
23b7869c | 1019 | rawsock_exit(); |
4d12b8b1 | 1020 | nfc_genl_exit(); |
3e256b8f LRV |
1021 | class_unregister(&nfc_class); |
1022 | } | |
1023 | ||
1024 | subsys_initcall(nfc_init); | |
1025 | module_exit(nfc_exit); | |
1026 | ||
1027 | MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); | |
1028 | MODULE_DESCRIPTION("NFC Core ver " VERSION); | |
1029 | MODULE_VERSION(VERSION); | |
1030 | MODULE_LICENSE("GPL"); | |
1155bb61 | 1031 | MODULE_ALIAS_NETPROTO(PF_NFC); |
5df16cad | 1032 | MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME); |