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 | ||
ed1e0ad8 JP |
24 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
25 | ||
3e256b8f LRV |
26 | #include <linux/init.h> |
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/slab.h> | |
30 | ||
31 | #include "nfc.h" | |
32 | ||
33 | #define VERSION "0.1" | |
34 | ||
35 | int nfc_devlist_generation; | |
36 | DEFINE_MUTEX(nfc_devlist_mutex); | |
37 | ||
38 | int nfc_printk(const char *level, const char *format, ...) | |
39 | { | |
40 | struct va_format vaf; | |
41 | va_list args; | |
42 | int r; | |
43 | ||
44 | va_start(args, format); | |
45 | ||
46 | vaf.fmt = format; | |
47 | vaf.va = &args; | |
48 | ||
49 | r = printk("%sNFC: %pV\n", level, &vaf); | |
50 | ||
51 | va_end(args); | |
52 | ||
53 | return r; | |
54 | } | |
55 | EXPORT_SYMBOL(nfc_printk); | |
56 | ||
8b3fe7b5 IE |
57 | /** |
58 | * nfc_dev_up - turn on the NFC device | |
59 | * | |
60 | * @dev: The nfc device to be turned on | |
61 | * | |
62 | * The device remains up until the nfc_dev_down function is called. | |
63 | */ | |
64 | int nfc_dev_up(struct nfc_dev *dev) | |
65 | { | |
66 | int rc = 0; | |
67 | ||
68 | nfc_dbg("dev_name=%s", dev_name(&dev->dev)); | |
69 | ||
70 | device_lock(&dev->dev); | |
71 | ||
72 | if (!device_is_registered(&dev->dev)) { | |
73 | rc = -ENODEV; | |
74 | goto error; | |
75 | } | |
76 | ||
77 | if (dev->dev_up) { | |
78 | rc = -EALREADY; | |
79 | goto error; | |
80 | } | |
81 | ||
82 | if (dev->ops->dev_up) | |
83 | rc = dev->ops->dev_up(dev); | |
84 | ||
85 | if (!rc) | |
86 | dev->dev_up = true; | |
87 | ||
88 | error: | |
89 | device_unlock(&dev->dev); | |
90 | return rc; | |
91 | } | |
92 | ||
93 | /** | |
94 | * nfc_dev_down - turn off the NFC device | |
95 | * | |
96 | * @dev: The nfc device to be turned off | |
97 | */ | |
98 | int nfc_dev_down(struct nfc_dev *dev) | |
99 | { | |
100 | int rc = 0; | |
101 | ||
102 | nfc_dbg("dev_name=%s", dev_name(&dev->dev)); | |
103 | ||
104 | device_lock(&dev->dev); | |
105 | ||
106 | if (!device_is_registered(&dev->dev)) { | |
107 | rc = -ENODEV; | |
108 | goto error; | |
109 | } | |
110 | ||
111 | if (!dev->dev_up) { | |
112 | rc = -EALREADY; | |
113 | goto error; | |
114 | } | |
115 | ||
116 | if (dev->polling || dev->remote_activated) { | |
117 | rc = -EBUSY; | |
118 | goto error; | |
119 | } | |
120 | ||
121 | if (dev->ops->dev_down) | |
122 | dev->ops->dev_down(dev); | |
123 | ||
124 | dev->dev_up = false; | |
125 | ||
126 | error: | |
127 | device_unlock(&dev->dev); | |
128 | return rc; | |
129 | } | |
130 | ||
3e256b8f LRV |
131 | /** |
132 | * nfc_start_poll - start polling for nfc targets | |
133 | * | |
134 | * @dev: The nfc device that must start polling | |
135 | * @protocols: bitset of nfc protocols that must be used for polling | |
136 | * | |
137 | * The device remains polling for targets until a target is found or | |
138 | * the nfc_stop_poll function is called. | |
139 | */ | |
140 | int nfc_start_poll(struct nfc_dev *dev, u32 protocols) | |
141 | { | |
142 | int rc; | |
143 | ||
144 | nfc_dbg("dev_name=%s protocols=0x%x", dev_name(&dev->dev), protocols); | |
145 | ||
146 | if (!protocols) | |
147 | return -EINVAL; | |
148 | ||
149 | device_lock(&dev->dev); | |
150 | ||
151 | if (!device_is_registered(&dev->dev)) { | |
152 | rc = -ENODEV; | |
153 | goto error; | |
154 | } | |
155 | ||
156 | if (dev->polling) { | |
157 | rc = -EBUSY; | |
158 | goto error; | |
159 | } | |
160 | ||
161 | rc = dev->ops->start_poll(dev, protocols); | |
162 | if (!rc) | |
163 | dev->polling = true; | |
164 | ||
165 | error: | |
166 | device_unlock(&dev->dev); | |
167 | return rc; | |
168 | } | |
169 | ||
170 | /** | |
171 | * nfc_stop_poll - stop polling for nfc targets | |
172 | * | |
173 | * @dev: The nfc device that must stop polling | |
174 | */ | |
175 | int nfc_stop_poll(struct nfc_dev *dev) | |
176 | { | |
177 | int rc = 0; | |
178 | ||
179 | nfc_dbg("dev_name=%s", dev_name(&dev->dev)); | |
180 | ||
181 | device_lock(&dev->dev); | |
182 | ||
183 | if (!device_is_registered(&dev->dev)) { | |
184 | rc = -ENODEV; | |
185 | goto error; | |
186 | } | |
187 | ||
188 | if (!dev->polling) { | |
189 | rc = -EINVAL; | |
190 | goto error; | |
191 | } | |
192 | ||
193 | dev->ops->stop_poll(dev); | |
194 | dev->polling = false; | |
195 | ||
196 | error: | |
197 | device_unlock(&dev->dev); | |
198 | return rc; | |
199 | } | |
200 | ||
201 | /** | |
202 | * nfc_activate_target - prepare the target for data exchange | |
203 | * | |
204 | * @dev: The nfc device that found the target | |
205 | * @target_idx: index of the target that must be activated | |
206 | * @protocol: nfc protocol that will be used for data exchange | |
207 | */ | |
208 | int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol) | |
209 | { | |
210 | int rc; | |
211 | ||
212 | nfc_dbg("dev_name=%s target_idx=%u protocol=%u", dev_name(&dev->dev), | |
213 | target_idx, protocol); | |
214 | ||
215 | device_lock(&dev->dev); | |
216 | ||
217 | if (!device_is_registered(&dev->dev)) { | |
218 | rc = -ENODEV; | |
219 | goto error; | |
220 | } | |
221 | ||
222 | rc = dev->ops->activate_target(dev, target_idx, protocol); | |
8b3fe7b5 IE |
223 | if (!rc) |
224 | dev->remote_activated = true; | |
3e256b8f LRV |
225 | |
226 | error: | |
227 | device_unlock(&dev->dev); | |
228 | return rc; | |
229 | } | |
230 | ||
231 | /** | |
232 | * nfc_deactivate_target - deactivate a nfc target | |
233 | * | |
234 | * @dev: The nfc device that found the target | |
235 | * @target_idx: index of the target that must be deactivated | |
236 | */ | |
237 | int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx) | |
238 | { | |
239 | int rc = 0; | |
240 | ||
241 | nfc_dbg("dev_name=%s target_idx=%u", dev_name(&dev->dev), target_idx); | |
242 | ||
243 | device_lock(&dev->dev); | |
244 | ||
245 | if (!device_is_registered(&dev->dev)) { | |
246 | rc = -ENODEV; | |
247 | goto error; | |
248 | } | |
249 | ||
250 | dev->ops->deactivate_target(dev, target_idx); | |
8b3fe7b5 | 251 | dev->remote_activated = false; |
3e256b8f LRV |
252 | |
253 | error: | |
254 | device_unlock(&dev->dev); | |
255 | return rc; | |
256 | } | |
257 | ||
258 | /** | |
259 | * nfc_data_exchange - transceive data | |
260 | * | |
261 | * @dev: The nfc device that found the target | |
262 | * @target_idx: index of the target | |
263 | * @skb: data to be sent | |
264 | * @cb: callback called when the response is received | |
265 | * @cb_context: parameter for the callback function | |
266 | * | |
267 | * The user must wait for the callback before calling this function again. | |
268 | */ | |
269 | int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, | |
270 | struct sk_buff *skb, | |
271 | data_exchange_cb_t cb, | |
272 | void *cb_context) | |
273 | { | |
274 | int rc; | |
275 | ||
276 | nfc_dbg("dev_name=%s target_idx=%u skb->len=%u", dev_name(&dev->dev), | |
277 | target_idx, skb->len); | |
278 | ||
279 | device_lock(&dev->dev); | |
280 | ||
281 | if (!device_is_registered(&dev->dev)) { | |
282 | rc = -ENODEV; | |
283 | kfree_skb(skb); | |
284 | goto error; | |
285 | } | |
286 | ||
287 | rc = dev->ops->data_exchange(dev, target_idx, skb, cb, cb_context); | |
288 | ||
289 | error: | |
290 | device_unlock(&dev->dev); | |
291 | return rc; | |
292 | } | |
293 | ||
294 | /** | |
295 | * nfc_alloc_skb - allocate a skb for data exchange responses | |
296 | * | |
297 | * @size: size to allocate | |
298 | * @gfp: gfp flags | |
299 | */ | |
300 | struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp) | |
301 | { | |
302 | struct sk_buff *skb; | |
303 | unsigned int total_size; | |
304 | ||
305 | total_size = size + 1; | |
306 | skb = alloc_skb(total_size, gfp); | |
307 | ||
308 | if (skb) | |
309 | skb_reserve(skb, 1); | |
310 | ||
311 | return skb; | |
312 | } | |
313 | EXPORT_SYMBOL(nfc_alloc_skb); | |
314 | ||
4d12b8b1 LRV |
315 | /** |
316 | * nfc_targets_found - inform that targets were found | |
317 | * | |
318 | * @dev: The nfc device that found the targets | |
319 | * @targets: array of nfc targets found | |
320 | * @ntargets: targets array size | |
321 | * | |
322 | * The device driver must call this function when one or many nfc targets | |
323 | * are found. After calling this function, the device driver must stop | |
324 | * polling for targets. | |
325 | */ | |
326 | int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets, | |
327 | int n_targets) | |
328 | { | |
329 | int i; | |
330 | ||
331 | nfc_dbg("dev_name=%s n_targets=%d", dev_name(&dev->dev), n_targets); | |
332 | ||
333 | dev->polling = false; | |
334 | ||
335 | for (i = 0; i < n_targets; i++) | |
336 | targets[i].idx = dev->target_idx++; | |
337 | ||
338 | spin_lock_bh(&dev->targets_lock); | |
339 | ||
340 | dev->targets_generation++; | |
341 | ||
342 | kfree(dev->targets); | |
343 | dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target), | |
344 | GFP_ATOMIC); | |
345 | ||
346 | if (!dev->targets) { | |
347 | dev->n_targets = 0; | |
348 | spin_unlock_bh(&dev->targets_lock); | |
349 | return -ENOMEM; | |
350 | } | |
351 | ||
352 | dev->n_targets = n_targets; | |
353 | spin_unlock_bh(&dev->targets_lock); | |
354 | ||
355 | nfc_genl_targets_found(dev); | |
356 | ||
357 | return 0; | |
358 | } | |
359 | EXPORT_SYMBOL(nfc_targets_found); | |
360 | ||
3e256b8f LRV |
361 | static void nfc_release(struct device *d) |
362 | { | |
363 | struct nfc_dev *dev = to_nfc_dev(d); | |
364 | ||
365 | nfc_dbg("dev_name=%s", dev_name(&dev->dev)); | |
366 | ||
4d12b8b1 LRV |
367 | nfc_genl_data_exit(&dev->genl_data); |
368 | kfree(dev->targets); | |
3e256b8f LRV |
369 | kfree(dev); |
370 | } | |
371 | ||
372 | struct class nfc_class = { | |
373 | .name = "nfc", | |
374 | .dev_release = nfc_release, | |
375 | }; | |
376 | EXPORT_SYMBOL(nfc_class); | |
377 | ||
378 | static int match_idx(struct device *d, void *data) | |
379 | { | |
380 | struct nfc_dev *dev = to_nfc_dev(d); | |
381 | unsigned *idx = data; | |
382 | ||
383 | return dev->idx == *idx; | |
384 | } | |
385 | ||
386 | struct nfc_dev *nfc_get_device(unsigned idx) | |
387 | { | |
388 | struct device *d; | |
389 | ||
390 | d = class_find_device(&nfc_class, NULL, &idx, match_idx); | |
391 | if (!d) | |
392 | return NULL; | |
393 | ||
394 | return to_nfc_dev(d); | |
395 | } | |
396 | ||
397 | /** | |
398 | * nfc_allocate_device - allocate a new nfc device | |
399 | * | |
400 | * @ops: device operations | |
401 | * @supported_protocols: NFC protocols supported by the device | |
402 | */ | |
403 | struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, | |
e8753043 SO |
404 | u32 supported_protocols, |
405 | int tx_headroom, | |
406 | int tx_tailroom) | |
3e256b8f LRV |
407 | { |
408 | static atomic_t dev_no = ATOMIC_INIT(0); | |
409 | struct nfc_dev *dev; | |
410 | ||
411 | if (!ops->start_poll || !ops->stop_poll || !ops->activate_target || | |
412 | !ops->deactivate_target || !ops->data_exchange) | |
413 | return NULL; | |
414 | ||
415 | if (!supported_protocols) | |
416 | return NULL; | |
417 | ||
418 | dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL); | |
419 | if (!dev) | |
420 | return NULL; | |
421 | ||
422 | dev->dev.class = &nfc_class; | |
423 | dev->idx = atomic_inc_return(&dev_no) - 1; | |
424 | dev_set_name(&dev->dev, "nfc%d", dev->idx); | |
425 | device_initialize(&dev->dev); | |
426 | ||
427 | dev->ops = ops; | |
428 | dev->supported_protocols = supported_protocols; | |
e8753043 SO |
429 | dev->tx_headroom = tx_headroom; |
430 | dev->tx_tailroom = tx_tailroom; | |
3e256b8f | 431 | |
4d12b8b1 LRV |
432 | spin_lock_init(&dev->targets_lock); |
433 | nfc_genl_data_init(&dev->genl_data); | |
434 | ||
435 | /* first generation must not be 0 */ | |
436 | dev->targets_generation = 1; | |
437 | ||
3e256b8f LRV |
438 | return dev; |
439 | } | |
440 | EXPORT_SYMBOL(nfc_allocate_device); | |
441 | ||
442 | /** | |
443 | * nfc_register_device - register a nfc device in the nfc subsystem | |
444 | * | |
445 | * @dev: The nfc device to register | |
446 | */ | |
447 | int nfc_register_device(struct nfc_dev *dev) | |
448 | { | |
449 | int rc; | |
450 | ||
451 | nfc_dbg("dev_name=%s", dev_name(&dev->dev)); | |
452 | ||
453 | mutex_lock(&nfc_devlist_mutex); | |
454 | nfc_devlist_generation++; | |
455 | rc = device_add(&dev->dev); | |
456 | mutex_unlock(&nfc_devlist_mutex); | |
457 | ||
4d12b8b1 LRV |
458 | if (rc < 0) |
459 | return rc; | |
460 | ||
461 | rc = nfc_genl_device_added(dev); | |
462 | if (rc) | |
463 | nfc_dbg("The userspace won't be notified that the device %s was" | |
464 | " added", dev_name(&dev->dev)); | |
465 | ||
466 | ||
467 | return 0; | |
3e256b8f LRV |
468 | } |
469 | EXPORT_SYMBOL(nfc_register_device); | |
470 | ||
471 | /** | |
472 | * nfc_unregister_device - unregister a nfc device in the nfc subsystem | |
473 | * | |
474 | * @dev: The nfc device to unregister | |
475 | */ | |
476 | void nfc_unregister_device(struct nfc_dev *dev) | |
477 | { | |
4d12b8b1 LRV |
478 | int rc; |
479 | ||
3e256b8f LRV |
480 | nfc_dbg("dev_name=%s", dev_name(&dev->dev)); |
481 | ||
482 | mutex_lock(&nfc_devlist_mutex); | |
483 | nfc_devlist_generation++; | |
484 | ||
485 | /* lock to avoid unregistering a device while an operation | |
486 | is in progress */ | |
487 | device_lock(&dev->dev); | |
488 | device_del(&dev->dev); | |
489 | device_unlock(&dev->dev); | |
490 | ||
491 | mutex_unlock(&nfc_devlist_mutex); | |
4d12b8b1 LRV |
492 | |
493 | rc = nfc_genl_device_removed(dev); | |
494 | if (rc) | |
495 | nfc_dbg("The userspace won't be notified that the device %s" | |
496 | " was removed", dev_name(&dev->dev)); | |
497 | ||
3e256b8f LRV |
498 | } |
499 | EXPORT_SYMBOL(nfc_unregister_device); | |
500 | ||
501 | static int __init nfc_init(void) | |
502 | { | |
4d12b8b1 LRV |
503 | int rc; |
504 | ||
ed1e0ad8 | 505 | pr_info("NFC Core ver %s\n", VERSION); |
3e256b8f | 506 | |
4d12b8b1 LRV |
507 | rc = class_register(&nfc_class); |
508 | if (rc) | |
509 | return rc; | |
510 | ||
511 | rc = nfc_genl_init(); | |
512 | if (rc) | |
513 | goto err_genl; | |
514 | ||
515 | /* the first generation must not be 0 */ | |
516 | nfc_devlist_generation = 1; | |
517 | ||
23b7869c LRV |
518 | rc = rawsock_init(); |
519 | if (rc) | |
520 | goto err_rawsock; | |
521 | ||
c7fe3b52 AAJ |
522 | rc = af_nfc_init(); |
523 | if (rc) | |
524 | goto err_af_nfc; | |
525 | ||
4d12b8b1 LRV |
526 | return 0; |
527 | ||
c7fe3b52 | 528 | err_af_nfc: |
23b7869c LRV |
529 | rawsock_exit(); |
530 | err_rawsock: | |
c7fe3b52 | 531 | nfc_genl_exit(); |
4d12b8b1 LRV |
532 | err_genl: |
533 | class_unregister(&nfc_class); | |
534 | return rc; | |
3e256b8f LRV |
535 | } |
536 | ||
537 | static void __exit nfc_exit(void) | |
538 | { | |
c7fe3b52 | 539 | af_nfc_exit(); |
23b7869c | 540 | rawsock_exit(); |
4d12b8b1 | 541 | nfc_genl_exit(); |
3e256b8f LRV |
542 | class_unregister(&nfc_class); |
543 | } | |
544 | ||
545 | subsys_initcall(nfc_init); | |
546 | module_exit(nfc_exit); | |
547 | ||
548 | MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); | |
549 | MODULE_DESCRIPTION("NFC Core ver " VERSION); | |
550 | MODULE_VERSION(VERSION); | |
551 | MODULE_LICENSE("GPL"); |