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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 | |
24 | #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
25 | |
26 | #include <linux/init.h> |
27 | #include <linux/kernel.h> |
28 | #include <linux/module.h> |
29 | #include <linux/slab.h> |
30 | #include <linux/nfc.h> |
31 | |
32 | #include <net/genetlink.h> |
33 | |
34 | #include "nfc.h" |
35 | |
36 | #define VERSION "0.1" |
37 | |
38 | #define NFC_CHECK_PRES_FREQ_MS 2000 |
39 | |
40 | int nfc_devlist_generation; |
41 | DEFINE_MUTEX(nfc_devlist_mutex); |
42 | |
43 | /* NFC device ID bitmap */ |
44 | static DEFINE_IDA(nfc_index_ida); |
45 | |
46 | /** |
47 | * nfc_dev_up - turn on the NFC device |
48 | * |
49 | * @dev: The nfc device to be turned on |
50 | * |
51 | * The device remains up until the nfc_dev_down function is called. |
52 | */ |
53 | int nfc_dev_up(struct nfc_dev *dev) |
54 | { |
55 | int rc = 0; |
56 | |
57 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
58 | |
59 | device_lock(&dev->dev); |
60 | |
61 | if (!device_is_registered(&dev->dev)) { |
62 | rc = -ENODEV; |
63 | goto error; |
64 | } |
65 | |
66 | if (dev->dev_up) { |
67 | rc = -EALREADY; |
68 | goto error; |
69 | } |
70 | |
71 | if (dev->ops->dev_up) |
72 | rc = dev->ops->dev_up(dev); |
73 | |
74 | if (!rc) |
75 | dev->dev_up = true; |
76 | |
77 | error: |
78 | device_unlock(&dev->dev); |
79 | return rc; |
80 | } |
81 | |
82 | /** |
83 | * nfc_dev_down - turn off the NFC device |
84 | * |
85 | * @dev: The nfc device to be turned off |
86 | */ |
87 | int nfc_dev_down(struct nfc_dev *dev) |
88 | { |
89 | int rc = 0; |
90 | |
91 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
92 | |
93 | device_lock(&dev->dev); |
94 | |
95 | if (!device_is_registered(&dev->dev)) { |
96 | rc = -ENODEV; |
97 | goto error; |
98 | } |
99 | |
100 | if (!dev->dev_up) { |
101 | rc = -EALREADY; |
102 | goto error; |
103 | } |
104 | |
105 | if (dev->polling || dev->active_target) { |
106 | rc = -EBUSY; |
107 | goto error; |
108 | } |
109 | |
110 | if (dev->ops->dev_down) |
111 | dev->ops->dev_down(dev); |
112 | |
113 | dev->dev_up = false; |
114 | |
115 | error: |
116 | device_unlock(&dev->dev); |
117 | return rc; |
118 | } |
119 | |
120 | /** |
121 | * nfc_start_poll - start polling for nfc targets |
122 | * |
123 | * @dev: The nfc device that must start polling |
124 | * @protocols: bitset of nfc protocols that must be used for polling |
125 | * |
126 | * The device remains polling for targets until a target is found or |
127 | * the nfc_stop_poll function is called. |
128 | */ |
129 | int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols) |
130 | { |
131 | int rc; |
132 | |
133 | pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n", |
134 | dev_name(&dev->dev), im_protocols, tm_protocols); |
135 | |
136 | if (!im_protocols && !tm_protocols) |
137 | return -EINVAL; |
138 | |
139 | device_lock(&dev->dev); |
140 | |
141 | if (!device_is_registered(&dev->dev)) { |
142 | rc = -ENODEV; |
143 | goto error; |
144 | } |
145 | |
146 | if (dev->polling) { |
147 | rc = -EBUSY; |
148 | goto error; |
149 | } |
150 | |
151 | rc = dev->ops->start_poll(dev, im_protocols, tm_protocols); |
152 | if (!rc) { |
153 | dev->polling = true; |
154 | dev->rf_mode = NFC_RF_NONE; |
155 | } |
156 | |
157 | error: |
158 | device_unlock(&dev->dev); |
159 | return rc; |
160 | } |
161 | |
162 | /** |
163 | * nfc_stop_poll - stop polling for nfc targets |
164 | * |
165 | * @dev: The nfc device that must stop polling |
166 | */ |
167 | int nfc_stop_poll(struct nfc_dev *dev) |
168 | { |
169 | int rc = 0; |
170 | |
171 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
172 | |
173 | device_lock(&dev->dev); |
174 | |
175 | if (!device_is_registered(&dev->dev)) { |
176 | rc = -ENODEV; |
177 | goto error; |
178 | } |
179 | |
180 | if (!dev->polling) { |
181 | rc = -EINVAL; |
182 | goto error; |
183 | } |
184 | |
185 | dev->ops->stop_poll(dev); |
186 | dev->polling = false; |
187 | dev->rf_mode = NFC_RF_NONE; |
188 | |
189 | error: |
190 | device_unlock(&dev->dev); |
191 | return rc; |
192 | } |
193 | |
194 | static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx) |
195 | { |
196 | int i; |
197 | |
198 | if (dev->n_targets == 0) |
199 | return NULL; |
200 | |
201 | for (i = 0; i < dev->n_targets; i++) { |
202 | if (dev->targets[i].idx == target_idx) |
203 | return &dev->targets[i]; |
204 | } |
205 | |
206 | return NULL; |
207 | } |
208 | |
209 | int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode) |
210 | { |
211 | int rc = 0; |
212 | u8 *gb; |
213 | size_t gb_len; |
214 | struct nfc_target *target; |
215 | |
216 | pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode); |
217 | |
218 | if (!dev->ops->dep_link_up) |
219 | return -EOPNOTSUPP; |
220 | |
221 | device_lock(&dev->dev); |
222 | |
223 | if (!device_is_registered(&dev->dev)) { |
224 | rc = -ENODEV; |
225 | goto error; |
226 | } |
227 | |
228 | if (dev->dep_link_up == true) { |
229 | rc = -EALREADY; |
230 | goto error; |
231 | } |
232 | |
233 | gb = nfc_llcp_general_bytes(dev, &gb_len); |
234 | if (gb_len > NFC_MAX_GT_LEN) { |
235 | rc = -EINVAL; |
236 | goto error; |
237 | } |
238 | |
239 | target = nfc_find_target(dev, target_index); |
240 | if (target == NULL) { |
241 | rc = -ENOTCONN; |
242 | goto error; |
243 | } |
244 | |
245 | rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len); |
246 | if (!rc) { |
247 | dev->active_target = target; |
248 | dev->rf_mode = NFC_RF_INITIATOR; |
249 | } |
250 | |
251 | error: |
252 | device_unlock(&dev->dev); |
253 | return rc; |
254 | } |
255 | |
256 | int nfc_dep_link_down(struct nfc_dev *dev) |
257 | { |
258 | int rc = 0; |
259 | |
260 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
261 | |
262 | if (!dev->ops->dep_link_down) |
263 | return -EOPNOTSUPP; |
264 | |
265 | device_lock(&dev->dev); |
266 | |
267 | if (!device_is_registered(&dev->dev)) { |
268 | rc = -ENODEV; |
269 | goto error; |
270 | } |
271 | |
272 | if (dev->dep_link_up == false) { |
273 | rc = -EALREADY; |
274 | goto error; |
275 | } |
276 | |
277 | rc = dev->ops->dep_link_down(dev); |
278 | if (!rc) { |
279 | dev->dep_link_up = false; |
280 | dev->active_target = NULL; |
281 | dev->rf_mode = NFC_RF_NONE; |
282 | nfc_llcp_mac_is_down(dev); |
283 | nfc_genl_dep_link_down_event(dev); |
284 | } |
285 | |
286 | error: |
287 | device_unlock(&dev->dev); |
288 | |
289 | return rc; |
290 | } |
291 | |
292 | int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, |
293 | u8 comm_mode, u8 rf_mode) |
294 | { |
295 | dev->dep_link_up = true; |
296 | |
297 | nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode); |
298 | |
299 | return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode); |
300 | } |
301 | EXPORT_SYMBOL(nfc_dep_link_is_up); |
302 | |
303 | /** |
304 | * nfc_activate_target - prepare the target for data exchange |
305 | * |
306 | * @dev: The nfc device that found the target |
307 | * @target_idx: index of the target that must be activated |
308 | * @protocol: nfc protocol that will be used for data exchange |
309 | */ |
310 | int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol) |
311 | { |
312 | int rc; |
313 | struct nfc_target *target; |
314 | |
315 | pr_debug("dev_name=%s target_idx=%u protocol=%u\n", |
316 | dev_name(&dev->dev), target_idx, protocol); |
317 | |
318 | device_lock(&dev->dev); |
319 | |
320 | if (!device_is_registered(&dev->dev)) { |
321 | rc = -ENODEV; |
322 | goto error; |
323 | } |
324 | |
325 | if (dev->active_target) { |
326 | rc = -EBUSY; |
327 | goto error; |
328 | } |
329 | |
330 | target = nfc_find_target(dev, target_idx); |
331 | if (target == NULL) { |
332 | rc = -ENOTCONN; |
333 | goto error; |
334 | } |
335 | |
336 | rc = dev->ops->activate_target(dev, target, protocol); |
337 | if (!rc) { |
338 | dev->active_target = target; |
339 | dev->rf_mode = NFC_RF_INITIATOR; |
340 | |
341 | if (dev->ops->check_presence && !dev->shutting_down) |
342 | mod_timer(&dev->check_pres_timer, jiffies + |
343 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); |
344 | } |
345 | |
346 | error: |
347 | device_unlock(&dev->dev); |
348 | return rc; |
349 | } |
350 | |
351 | /** |
352 | * nfc_deactivate_target - deactivate a nfc target |
353 | * |
354 | * @dev: The nfc device that found the target |
355 | * @target_idx: index of the target that must be deactivated |
356 | */ |
357 | int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx) |
358 | { |
359 | int rc = 0; |
360 | |
361 | pr_debug("dev_name=%s target_idx=%u\n", |
362 | dev_name(&dev->dev), target_idx); |
363 | |
364 | device_lock(&dev->dev); |
365 | |
366 | if (!device_is_registered(&dev->dev)) { |
367 | rc = -ENODEV; |
368 | goto error; |
369 | } |
370 | |
371 | if (dev->active_target == NULL) { |
372 | rc = -ENOTCONN; |
373 | goto error; |
374 | } |
375 | |
376 | if (dev->active_target->idx != target_idx) { |
377 | rc = -ENOTCONN; |
378 | goto error; |
379 | } |
380 | |
381 | if (dev->ops->check_presence) |
382 | del_timer_sync(&dev->check_pres_timer); |
383 | |
384 | dev->ops->deactivate_target(dev, dev->active_target); |
385 | dev->active_target = NULL; |
386 | |
387 | error: |
388 | device_unlock(&dev->dev); |
389 | return rc; |
390 | } |
391 | |
392 | /** |
393 | * nfc_data_exchange - transceive data |
394 | * |
395 | * @dev: The nfc device that found the target |
396 | * @target_idx: index of the target |
397 | * @skb: data to be sent |
398 | * @cb: callback called when the response is received |
399 | * @cb_context: parameter for the callback function |
400 | * |
401 | * The user must wait for the callback before calling this function again. |
402 | */ |
403 | int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb, |
404 | data_exchange_cb_t cb, void *cb_context) |
405 | { |
406 | int rc; |
407 | |
408 | pr_debug("dev_name=%s target_idx=%u skb->len=%u\n", |
409 | dev_name(&dev->dev), target_idx, skb->len); |
410 | |
411 | device_lock(&dev->dev); |
412 | |
413 | if (!device_is_registered(&dev->dev)) { |
414 | rc = -ENODEV; |
415 | kfree_skb(skb); |
416 | goto error; |
417 | } |
418 | |
419 | if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) { |
420 | if (dev->active_target->idx != target_idx) { |
421 | rc = -EADDRNOTAVAIL; |
422 | kfree_skb(skb); |
423 | goto error; |
424 | } |
425 | |
426 | if (dev->ops->check_presence) |
427 | del_timer_sync(&dev->check_pres_timer); |
428 | |
429 | rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb, |
430 | cb_context); |
431 | |
432 | if (!rc && dev->ops->check_presence && !dev->shutting_down) |
433 | mod_timer(&dev->check_pres_timer, jiffies + |
434 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); |
435 | } else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) { |
436 | rc = dev->ops->tm_send(dev, skb); |
437 | } else { |
438 | rc = -ENOTCONN; |
439 | kfree_skb(skb); |
440 | goto error; |
441 | } |
442 | |
443 | |
444 | error: |
445 | device_unlock(&dev->dev); |
446 | return rc; |
447 | } |
448 | |
449 | int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len) |
450 | { |
451 | pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len); |
452 | |
453 | if (gb_len > NFC_MAX_GT_LEN) |
454 | return -EINVAL; |
455 | |
456 | return nfc_llcp_set_remote_gb(dev, gb, gb_len); |
457 | } |
458 | EXPORT_SYMBOL(nfc_set_remote_general_bytes); |
459 | |
460 | u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len) |
461 | { |
462 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
463 | |
464 | return nfc_llcp_general_bytes(dev, gb_len); |
465 | } |
466 | EXPORT_SYMBOL(nfc_get_local_general_bytes); |
467 | |
468 | int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb) |
469 | { |
470 | /* Only LLCP target mode for now */ |
471 | if (dev->dep_link_up == false) { |
472 | kfree_skb(skb); |
473 | return -ENOLINK; |
474 | } |
475 | |
476 | return nfc_llcp_data_received(dev, skb); |
477 | } |
478 | EXPORT_SYMBOL(nfc_tm_data_received); |
479 | |
480 | int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode, |
481 | u8 *gb, size_t gb_len) |
482 | { |
483 | int rc; |
484 | |
485 | device_lock(&dev->dev); |
486 | |
487 | dev->polling = false; |
488 | |
489 | if (gb != NULL) { |
490 | rc = nfc_set_remote_general_bytes(dev, gb, gb_len); |
491 | if (rc < 0) |
492 | goto out; |
493 | } |
494 | |
495 | dev->rf_mode = NFC_RF_TARGET; |
496 | |
497 | if (protocol == NFC_PROTO_NFC_DEP_MASK) |
498 | nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET); |
499 | |
500 | rc = nfc_genl_tm_activated(dev, protocol); |
501 | |
502 | out: |
503 | device_unlock(&dev->dev); |
504 | |
505 | return rc; |
506 | } |
507 | EXPORT_SYMBOL(nfc_tm_activated); |
508 | |
509 | int nfc_tm_deactivated(struct nfc_dev *dev) |
510 | { |
511 | dev->dep_link_up = false; |
512 | dev->rf_mode = NFC_RF_NONE; |
513 | |
514 | return nfc_genl_tm_deactivated(dev); |
515 | } |
516 | EXPORT_SYMBOL(nfc_tm_deactivated); |
517 | |
518 | /** |
519 | * nfc_alloc_send_skb - allocate a skb for data exchange responses |
520 | * |
521 | * @size: size to allocate |
522 | * @gfp: gfp flags |
523 | */ |
524 | struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk, |
525 | unsigned int flags, unsigned int size, |
526 | unsigned int *err) |
527 | { |
528 | struct sk_buff *skb; |
529 | unsigned int total_size; |
530 | |
531 | total_size = size + |
532 | dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; |
533 | |
534 | skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err); |
535 | if (skb) |
536 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); |
537 | |
538 | return skb; |
539 | } |
540 | |
541 | /** |
542 | * nfc_alloc_recv_skb - allocate a skb for data exchange responses |
543 | * |
544 | * @size: size to allocate |
545 | * @gfp: gfp flags |
546 | */ |
547 | struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp) |
548 | { |
549 | struct sk_buff *skb; |
550 | unsigned int total_size; |
551 | |
552 | total_size = size + 1; |
553 | skb = alloc_skb(total_size, gfp); |
554 | |
555 | if (skb) |
556 | skb_reserve(skb, 1); |
557 | |
558 | return skb; |
559 | } |
560 | EXPORT_SYMBOL(nfc_alloc_recv_skb); |
561 | |
562 | /** |
563 | * nfc_targets_found - inform that targets were found |
564 | * |
565 | * @dev: The nfc device that found the targets |
566 | * @targets: array of nfc targets found |
567 | * @ntargets: targets array size |
568 | * |
569 | * The device driver must call this function when one or many nfc targets |
570 | * are found. After calling this function, the device driver must stop |
571 | * polling for targets. |
572 | * NOTE: This function can be called with targets=NULL and n_targets=0 to |
573 | * notify a driver error, meaning that the polling operation cannot complete. |
574 | * IMPORTANT: this function must not be called from an atomic context. |
575 | * In addition, it must also not be called from a context that would prevent |
576 | * the NFC Core to call other nfc ops entry point concurrently. |
577 | */ |
578 | int nfc_targets_found(struct nfc_dev *dev, |
579 | struct nfc_target *targets, int n_targets) |
580 | { |
581 | int i; |
582 | |
583 | pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets); |
584 | |
585 | for (i = 0; i < n_targets; i++) |
586 | targets[i].idx = dev->target_next_idx++; |
587 | |
588 | device_lock(&dev->dev); |
589 | |
590 | if (dev->polling == false) { |
591 | device_unlock(&dev->dev); |
592 | return 0; |
593 | } |
594 | |
595 | dev->polling = false; |
596 | |
597 | dev->targets_generation++; |
598 | |
599 | kfree(dev->targets); |
600 | dev->targets = NULL; |
601 | |
602 | if (targets) { |
603 | dev->targets = kmemdup(targets, |
604 | n_targets * sizeof(struct nfc_target), |
605 | GFP_ATOMIC); |
606 | |
607 | if (!dev->targets) { |
608 | dev->n_targets = 0; |
609 | device_unlock(&dev->dev); |
610 | return -ENOMEM; |
611 | } |
612 | } |
613 | |
614 | dev->n_targets = n_targets; |
615 | device_unlock(&dev->dev); |
616 | |
617 | nfc_genl_targets_found(dev); |
618 | |
619 | return 0; |
620 | } |
621 | EXPORT_SYMBOL(nfc_targets_found); |
622 | |
623 | /** |
624 | * nfc_target_lost - inform that an activated target went out of field |
625 | * |
626 | * @dev: The nfc device that had the activated target in field |
627 | * @target_idx: the nfc index of the target |
628 | * |
629 | * The device driver must call this function when the activated target |
630 | * goes out of the field. |
631 | * IMPORTANT: this function must not be called from an atomic context. |
632 | * In addition, it must also not be called from a context that would prevent |
633 | * the NFC Core to call other nfc ops entry point concurrently. |
634 | */ |
635 | int nfc_target_lost(struct nfc_dev *dev, u32 target_idx) |
636 | { |
637 | struct nfc_target *tg; |
638 | int i; |
639 | |
640 | pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx); |
641 | |
642 | device_lock(&dev->dev); |
643 | |
644 | for (i = 0; i < dev->n_targets; i++) { |
645 | tg = &dev->targets[i]; |
646 | if (tg->idx == target_idx) |
647 | break; |
648 | } |
649 | |
650 | if (i == dev->n_targets) { |
651 | device_unlock(&dev->dev); |
652 | return -EINVAL; |
653 | } |
654 | |
655 | dev->targets_generation++; |
656 | dev->n_targets--; |
657 | dev->active_target = NULL; |
658 | |
659 | if (dev->n_targets) { |
660 | memcpy(&dev->targets[i], &dev->targets[i + 1], |
661 | (dev->n_targets - i) * sizeof(struct nfc_target)); |
662 | } else { |
663 | kfree(dev->targets); |
664 | dev->targets = NULL; |
665 | } |
666 | |
667 | device_unlock(&dev->dev); |
668 | |
669 | nfc_genl_target_lost(dev, target_idx); |
670 | |
671 | return 0; |
672 | } |
673 | EXPORT_SYMBOL(nfc_target_lost); |
674 | |
675 | inline void nfc_driver_failure(struct nfc_dev *dev, int err) |
676 | { |
677 | nfc_targets_found(dev, NULL, 0); |
678 | } |
679 | EXPORT_SYMBOL(nfc_driver_failure); |
680 | |
681 | static void nfc_release(struct device *d) |
682 | { |
683 | struct nfc_dev *dev = to_nfc_dev(d); |
684 | |
685 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
686 | |
687 | nfc_genl_data_exit(&dev->genl_data); |
688 | kfree(dev->targets); |
689 | kfree(dev); |
690 | } |
691 | |
692 | static void nfc_check_pres_work(struct work_struct *work) |
693 | { |
694 | struct nfc_dev *dev = container_of(work, struct nfc_dev, |
695 | check_pres_work); |
696 | int rc; |
697 | |
698 | device_lock(&dev->dev); |
699 | |
700 | if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) { |
701 | rc = dev->ops->check_presence(dev, dev->active_target); |
702 | if (rc == -EOPNOTSUPP) |
703 | goto exit; |
704 | if (rc) { |
705 | u32 active_target_idx = dev->active_target->idx; |
706 | device_unlock(&dev->dev); |
707 | nfc_target_lost(dev, active_target_idx); |
708 | return; |
709 | } |
710 | |
711 | if (!dev->shutting_down) |
712 | mod_timer(&dev->check_pres_timer, jiffies + |
713 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); |
714 | } |
715 | |
716 | exit: |
717 | device_unlock(&dev->dev); |
718 | } |
719 | |
720 | static void nfc_check_pres_timeout(unsigned long data) |
721 | { |
722 | struct nfc_dev *dev = (struct nfc_dev *)data; |
723 | |
724 | schedule_work(&dev->check_pres_work); |
725 | } |
726 | |
727 | struct class nfc_class = { |
728 | .name = "nfc", |
729 | .dev_release = nfc_release, |
730 | }; |
731 | EXPORT_SYMBOL(nfc_class); |
732 | |
733 | static int match_idx(struct device *d, const void *data) |
734 | { |
735 | struct nfc_dev *dev = to_nfc_dev(d); |
736 | const unsigned int *idx = data; |
737 | |
738 | return dev->idx == *idx; |
739 | } |
740 | |
741 | struct nfc_dev *nfc_get_device(unsigned int idx) |
742 | { |
743 | struct device *d; |
744 | |
745 | d = class_find_device(&nfc_class, NULL, &idx, match_idx); |
746 | if (!d) |
747 | return NULL; |
748 | |
749 | return to_nfc_dev(d); |
750 | } |
751 | |
752 | /** |
753 | * nfc_allocate_device - allocate a new nfc device |
754 | * |
755 | * @ops: device operations |
756 | * @supported_protocols: NFC protocols supported by the device |
757 | */ |
758 | struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, |
759 | u32 supported_protocols, |
760 | u32 supported_se, |
761 | int tx_headroom, int tx_tailroom) |
762 | { |
763 | struct nfc_dev *dev; |
764 | |
765 | if (!ops->start_poll || !ops->stop_poll || !ops->activate_target || |
766 | !ops->deactivate_target || !ops->im_transceive) |
767 | return NULL; |
768 | |
769 | if (!supported_protocols) |
770 | return NULL; |
771 | |
772 | dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL); |
773 | if (!dev) |
774 | return NULL; |
775 | |
776 | dev->ops = ops; |
777 | dev->supported_protocols = supported_protocols; |
778 | dev->supported_se = supported_se; |
779 | dev->active_se = NFC_SE_NONE; |
780 | dev->tx_headroom = tx_headroom; |
781 | dev->tx_tailroom = tx_tailroom; |
782 | |
783 | nfc_genl_data_init(&dev->genl_data); |
784 | |
785 | dev->rf_mode = NFC_RF_NONE; |
786 | |
787 | /* first generation must not be 0 */ |
788 | dev->targets_generation = 1; |
789 | |
790 | if (ops->check_presence) { |
791 | init_timer(&dev->check_pres_timer); |
792 | dev->check_pres_timer.data = (unsigned long)dev; |
793 | dev->check_pres_timer.function = nfc_check_pres_timeout; |
794 | |
795 | INIT_WORK(&dev->check_pres_work, nfc_check_pres_work); |
796 | } |
797 | |
798 | return dev; |
799 | } |
800 | EXPORT_SYMBOL(nfc_allocate_device); |
801 | |
802 | /** |
803 | * nfc_register_device - register a nfc device in the nfc subsystem |
804 | * |
805 | * @dev: The nfc device to register |
806 | */ |
807 | int nfc_register_device(struct nfc_dev *dev) |
808 | { |
809 | int rc; |
810 | |
811 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
812 | |
813 | dev->idx = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL); |
814 | if (dev->idx < 0) |
815 | return dev->idx; |
816 | |
817 | dev->dev.class = &nfc_class; |
818 | dev_set_name(&dev->dev, "nfc%d", dev->idx); |
819 | device_initialize(&dev->dev); |
820 | |
821 | mutex_lock(&nfc_devlist_mutex); |
822 | nfc_devlist_generation++; |
823 | rc = device_add(&dev->dev); |
824 | mutex_unlock(&nfc_devlist_mutex); |
825 | |
826 | if (rc < 0) |
827 | return rc; |
828 | |
829 | rc = nfc_llcp_register_device(dev); |
830 | if (rc) |
831 | pr_err("Could not register llcp device\n"); |
832 | |
833 | rc = nfc_genl_device_added(dev); |
834 | if (rc) |
835 | pr_debug("The userspace won't be notified that the device %s was added\n", |
836 | dev_name(&dev->dev)); |
837 | |
838 | return 0; |
839 | } |
840 | EXPORT_SYMBOL(nfc_register_device); |
841 | |
842 | /** |
843 | * nfc_unregister_device - unregister a nfc device in the nfc subsystem |
844 | * |
845 | * @dev: The nfc device to unregister |
846 | */ |
847 | void nfc_unregister_device(struct nfc_dev *dev) |
848 | { |
849 | int rc, id; |
850 | |
851 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
852 | |
853 | id = dev->idx; |
854 | |
855 | if (dev->ops->check_presence) { |
856 | device_lock(&dev->dev); |
857 | dev->shutting_down = true; |
858 | device_unlock(&dev->dev); |
859 | del_timer_sync(&dev->check_pres_timer); |
860 | cancel_work_sync(&dev->check_pres_work); |
861 | } |
862 | |
863 | rc = nfc_genl_device_removed(dev); |
864 | if (rc) |
865 | pr_debug("The userspace won't be notified that the device %s " |
866 | "was removed\n", dev_name(&dev->dev)); |
867 | |
868 | nfc_llcp_unregister_device(dev); |
869 | |
870 | mutex_lock(&nfc_devlist_mutex); |
871 | nfc_devlist_generation++; |
872 | device_del(&dev->dev); |
873 | mutex_unlock(&nfc_devlist_mutex); |
874 | |
875 | ida_simple_remove(&nfc_index_ida, id); |
876 | } |
877 | EXPORT_SYMBOL(nfc_unregister_device); |
878 | |
879 | static int __init nfc_init(void) |
880 | { |
881 | int rc; |
882 | |
883 | pr_info("NFC Core ver %s\n", VERSION); |
884 | |
885 | rc = class_register(&nfc_class); |
886 | if (rc) |
887 | return rc; |
888 | |
889 | rc = nfc_genl_init(); |
890 | if (rc) |
891 | goto err_genl; |
892 | |
893 | /* the first generation must not be 0 */ |
894 | nfc_devlist_generation = 1; |
895 | |
896 | rc = rawsock_init(); |
897 | if (rc) |
898 | goto err_rawsock; |
899 | |
900 | rc = nfc_llcp_init(); |
901 | if (rc) |
902 | goto err_llcp_sock; |
903 | |
904 | rc = af_nfc_init(); |
905 | if (rc) |
906 | goto err_af_nfc; |
907 | |
908 | return 0; |
909 | |
910 | err_af_nfc: |
911 | nfc_llcp_exit(); |
912 | err_llcp_sock: |
913 | rawsock_exit(); |
914 | err_rawsock: |
915 | nfc_genl_exit(); |
916 | err_genl: |
917 | class_unregister(&nfc_class); |
918 | return rc; |
919 | } |
920 | |
921 | static void __exit nfc_exit(void) |
922 | { |
923 | af_nfc_exit(); |
924 | nfc_llcp_exit(); |
925 | rawsock_exit(); |
926 | nfc_genl_exit(); |
927 | class_unregister(&nfc_class); |
928 | } |
929 | |
930 | subsys_initcall(nfc_init); |
931 | module_exit(nfc_exit); |
932 | |
933 | MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); |
934 | MODULE_DESCRIPTION("NFC Core ver " VERSION); |
935 | MODULE_VERSION(VERSION); |
936 | MODULE_LICENSE("GPL"); |
937 | MODULE_ALIAS_NETPROTO(PF_NFC); |
938 | MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME); |
939 |
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Tags:
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v2.6.34-rc5
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