1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) 2011 Instituto Nokia de Tecnologia |
4 | * |
5 | * Authors: |
6 | * Lauro Ramos Venancio <lauro.venancio@openbossa.org> |
7 | * Aloisio Almeida Jr <aloisio.almeida@openbossa.org> |
8 | */ |
9 | |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
11 | |
12 | #include <linux/init.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/module.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/rfkill.h> |
17 | #include <linux/nfc.h> |
18 | |
19 | #include <net/genetlink.h> |
20 | |
21 | #include "nfc.h" |
22 | |
23 | #define VERSION "0.1" |
24 | |
25 | #define NFC_CHECK_PRES_FREQ_MS 2000 |
26 | |
27 | int nfc_devlist_generation; |
28 | DEFINE_MUTEX(nfc_devlist_mutex); |
29 | |
30 | /* NFC device ID bitmap */ |
31 | static DEFINE_IDA(nfc_index_ida); |
32 | |
33 | int nfc_fw_download(struct nfc_dev *dev, const char *firmware_name) |
34 | { |
35 | int rc = 0; |
36 | |
37 | pr_debug("%s do firmware %s\n" , dev_name(&dev->dev), firmware_name); |
38 | |
39 | device_lock(dev: &dev->dev); |
40 | |
41 | if (dev->shutting_down) { |
42 | rc = -ENODEV; |
43 | goto error; |
44 | } |
45 | |
46 | if (dev->dev_up) { |
47 | rc = -EBUSY; |
48 | goto error; |
49 | } |
50 | |
51 | if (!dev->ops->fw_download) { |
52 | rc = -EOPNOTSUPP; |
53 | goto error; |
54 | } |
55 | |
56 | dev->fw_download_in_progress = true; |
57 | rc = dev->ops->fw_download(dev, firmware_name); |
58 | if (rc) |
59 | dev->fw_download_in_progress = false; |
60 | |
61 | error: |
62 | device_unlock(dev: &dev->dev); |
63 | return rc; |
64 | } |
65 | |
66 | /** |
67 | * nfc_fw_download_done - inform that a firmware download was completed |
68 | * |
69 | * @dev: The nfc device to which firmware was downloaded |
70 | * @firmware_name: The firmware filename |
71 | * @result: The positive value of a standard errno value |
72 | */ |
73 | int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name, |
74 | u32 result) |
75 | { |
76 | dev->fw_download_in_progress = false; |
77 | |
78 | return nfc_genl_fw_download_done(dev, firmware_name, result); |
79 | } |
80 | EXPORT_SYMBOL(nfc_fw_download_done); |
81 | |
82 | /** |
83 | * nfc_dev_up - turn on the NFC device |
84 | * |
85 | * @dev: The nfc device to be turned on |
86 | * |
87 | * The device remains up until the nfc_dev_down function is called. |
88 | */ |
89 | int nfc_dev_up(struct nfc_dev *dev) |
90 | { |
91 | int rc = 0; |
92 | |
93 | pr_debug("dev_name=%s\n" , dev_name(&dev->dev)); |
94 | |
95 | device_lock(dev: &dev->dev); |
96 | |
97 | if (dev->shutting_down) { |
98 | rc = -ENODEV; |
99 | goto error; |
100 | } |
101 | |
102 | if (dev->rfkill && rfkill_blocked(rfkill: dev->rfkill)) { |
103 | rc = -ERFKILL; |
104 | goto error; |
105 | } |
106 | |
107 | if (dev->fw_download_in_progress) { |
108 | rc = -EBUSY; |
109 | goto error; |
110 | } |
111 | |
112 | if (dev->dev_up) { |
113 | rc = -EALREADY; |
114 | goto error; |
115 | } |
116 | |
117 | if (dev->ops->dev_up) |
118 | rc = dev->ops->dev_up(dev); |
119 | |
120 | if (!rc) |
121 | dev->dev_up = true; |
122 | |
123 | /* We have to enable the device before discovering SEs */ |
124 | if (dev->ops->discover_se && dev->ops->discover_se(dev)) |
125 | pr_err("SE discovery failed\n" ); |
126 | |
127 | error: |
128 | device_unlock(dev: &dev->dev); |
129 | return rc; |
130 | } |
131 | |
132 | /** |
133 | * nfc_dev_down - turn off the NFC device |
134 | * |
135 | * @dev: The nfc device to be turned off |
136 | */ |
137 | int nfc_dev_down(struct nfc_dev *dev) |
138 | { |
139 | int rc = 0; |
140 | |
141 | pr_debug("dev_name=%s\n" , dev_name(&dev->dev)); |
142 | |
143 | device_lock(dev: &dev->dev); |
144 | |
145 | if (dev->shutting_down) { |
146 | rc = -ENODEV; |
147 | goto error; |
148 | } |
149 | |
150 | if (!dev->dev_up) { |
151 | rc = -EALREADY; |
152 | goto error; |
153 | } |
154 | |
155 | if (dev->polling || dev->active_target) { |
156 | rc = -EBUSY; |
157 | goto error; |
158 | } |
159 | |
160 | if (dev->ops->dev_down) |
161 | dev->ops->dev_down(dev); |
162 | |
163 | dev->dev_up = false; |
164 | |
165 | error: |
166 | device_unlock(dev: &dev->dev); |
167 | return rc; |
168 | } |
169 | |
170 | static int nfc_rfkill_set_block(void *data, bool blocked) |
171 | { |
172 | struct nfc_dev *dev = data; |
173 | |
174 | pr_debug("%s blocked %d" , dev_name(&dev->dev), blocked); |
175 | |
176 | if (!blocked) |
177 | return 0; |
178 | |
179 | nfc_dev_down(dev); |
180 | |
181 | return 0; |
182 | } |
183 | |
184 | static const struct rfkill_ops nfc_rfkill_ops = { |
185 | .set_block = nfc_rfkill_set_block, |
186 | }; |
187 | |
188 | /** |
189 | * nfc_start_poll - start polling for nfc targets |
190 | * |
191 | * @dev: The nfc device that must start polling |
192 | * @im_protocols: bitset of nfc initiator protocols to be used for polling |
193 | * @tm_protocols: bitset of nfc transport protocols to be used for polling |
194 | * |
195 | * The device remains polling for targets until a target is found or |
196 | * the nfc_stop_poll function is called. |
197 | */ |
198 | int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols) |
199 | { |
200 | int rc; |
201 | |
202 | pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n" , |
203 | dev_name(&dev->dev), im_protocols, tm_protocols); |
204 | |
205 | if (!im_protocols && !tm_protocols) |
206 | return -EINVAL; |
207 | |
208 | device_lock(dev: &dev->dev); |
209 | |
210 | if (dev->shutting_down) { |
211 | rc = -ENODEV; |
212 | goto error; |
213 | } |
214 | |
215 | if (!dev->dev_up) { |
216 | rc = -ENODEV; |
217 | goto error; |
218 | } |
219 | |
220 | if (dev->polling) { |
221 | rc = -EBUSY; |
222 | goto error; |
223 | } |
224 | |
225 | rc = dev->ops->start_poll(dev, im_protocols, tm_protocols); |
226 | if (!rc) { |
227 | dev->polling = true; |
228 | dev->rf_mode = NFC_RF_NONE; |
229 | } |
230 | |
231 | error: |
232 | device_unlock(dev: &dev->dev); |
233 | return rc; |
234 | } |
235 | |
236 | /** |
237 | * nfc_stop_poll - stop polling for nfc targets |
238 | * |
239 | * @dev: The nfc device that must stop polling |
240 | */ |
241 | int nfc_stop_poll(struct nfc_dev *dev) |
242 | { |
243 | int rc = 0; |
244 | |
245 | pr_debug("dev_name=%s\n" , dev_name(&dev->dev)); |
246 | |
247 | device_lock(dev: &dev->dev); |
248 | |
249 | if (dev->shutting_down) { |
250 | rc = -ENODEV; |
251 | goto error; |
252 | } |
253 | |
254 | if (!dev->polling) { |
255 | rc = -EINVAL; |
256 | goto error; |
257 | } |
258 | |
259 | dev->ops->stop_poll(dev); |
260 | dev->polling = false; |
261 | dev->rf_mode = NFC_RF_NONE; |
262 | |
263 | error: |
264 | device_unlock(dev: &dev->dev); |
265 | return rc; |
266 | } |
267 | |
268 | static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx) |
269 | { |
270 | int i; |
271 | |
272 | for (i = 0; i < dev->n_targets; i++) { |
273 | if (dev->targets[i].idx == target_idx) |
274 | return &dev->targets[i]; |
275 | } |
276 | |
277 | return NULL; |
278 | } |
279 | |
280 | int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode) |
281 | { |
282 | int rc = 0; |
283 | u8 *gb; |
284 | size_t gb_len; |
285 | struct nfc_target *target; |
286 | |
287 | pr_debug("dev_name=%s comm %d\n" , dev_name(&dev->dev), comm_mode); |
288 | |
289 | if (!dev->ops->dep_link_up) |
290 | return -EOPNOTSUPP; |
291 | |
292 | device_lock(dev: &dev->dev); |
293 | |
294 | if (dev->shutting_down) { |
295 | rc = -ENODEV; |
296 | goto error; |
297 | } |
298 | |
299 | if (dev->dep_link_up == true) { |
300 | rc = -EALREADY; |
301 | goto error; |
302 | } |
303 | |
304 | gb = nfc_llcp_general_bytes(dev, general_bytes_len: &gb_len); |
305 | if (gb_len > NFC_MAX_GT_LEN) { |
306 | rc = -EINVAL; |
307 | goto error; |
308 | } |
309 | |
310 | target = nfc_find_target(dev, target_idx: target_index); |
311 | if (target == NULL) { |
312 | rc = -ENOTCONN; |
313 | goto error; |
314 | } |
315 | |
316 | rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len); |
317 | if (!rc) { |
318 | dev->active_target = target; |
319 | dev->rf_mode = NFC_RF_INITIATOR; |
320 | } |
321 | |
322 | error: |
323 | device_unlock(dev: &dev->dev); |
324 | return rc; |
325 | } |
326 | |
327 | int nfc_dep_link_down(struct nfc_dev *dev) |
328 | { |
329 | int rc = 0; |
330 | |
331 | pr_debug("dev_name=%s\n" , dev_name(&dev->dev)); |
332 | |
333 | if (!dev->ops->dep_link_down) |
334 | return -EOPNOTSUPP; |
335 | |
336 | device_lock(dev: &dev->dev); |
337 | |
338 | if (dev->shutting_down) { |
339 | rc = -ENODEV; |
340 | goto error; |
341 | } |
342 | |
343 | if (dev->dep_link_up == false) { |
344 | rc = -EALREADY; |
345 | goto error; |
346 | } |
347 | |
348 | rc = dev->ops->dep_link_down(dev); |
349 | if (!rc) { |
350 | dev->dep_link_up = false; |
351 | dev->active_target = NULL; |
352 | dev->rf_mode = NFC_RF_NONE; |
353 | nfc_llcp_mac_is_down(dev); |
354 | nfc_genl_dep_link_down_event(dev); |
355 | } |
356 | |
357 | error: |
358 | device_unlock(dev: &dev->dev); |
359 | |
360 | return rc; |
361 | } |
362 | |
363 | int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, |
364 | u8 comm_mode, u8 rf_mode) |
365 | { |
366 | dev->dep_link_up = true; |
367 | |
368 | if (!dev->active_target && rf_mode == NFC_RF_INITIATOR) { |
369 | struct nfc_target *target; |
370 | |
371 | target = nfc_find_target(dev, target_idx); |
372 | if (target == NULL) |
373 | return -ENOTCONN; |
374 | |
375 | dev->active_target = target; |
376 | } |
377 | |
378 | dev->polling = false; |
379 | dev->rf_mode = rf_mode; |
380 | |
381 | nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode); |
382 | |
383 | return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode); |
384 | } |
385 | EXPORT_SYMBOL(nfc_dep_link_is_up); |
386 | |
387 | /** |
388 | * nfc_activate_target - prepare the target for data exchange |
389 | * |
390 | * @dev: The nfc device that found the target |
391 | * @target_idx: index of the target that must be activated |
392 | * @protocol: nfc protocol that will be used for data exchange |
393 | */ |
394 | int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol) |
395 | { |
396 | int rc; |
397 | struct nfc_target *target; |
398 | |
399 | pr_debug("dev_name=%s target_idx=%u protocol=%u\n" , |
400 | dev_name(&dev->dev), target_idx, protocol); |
401 | |
402 | device_lock(dev: &dev->dev); |
403 | |
404 | if (dev->shutting_down) { |
405 | rc = -ENODEV; |
406 | goto error; |
407 | } |
408 | |
409 | if (dev->active_target) { |
410 | rc = -EBUSY; |
411 | goto error; |
412 | } |
413 | |
414 | target = nfc_find_target(dev, target_idx); |
415 | if (target == NULL) { |
416 | rc = -ENOTCONN; |
417 | goto error; |
418 | } |
419 | |
420 | rc = dev->ops->activate_target(dev, target, protocol); |
421 | if (!rc) { |
422 | dev->active_target = target; |
423 | dev->rf_mode = NFC_RF_INITIATOR; |
424 | |
425 | if (dev->ops->check_presence && !dev->shutting_down) |
426 | mod_timer(timer: &dev->check_pres_timer, expires: jiffies + |
427 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); |
428 | } |
429 | |
430 | error: |
431 | device_unlock(dev: &dev->dev); |
432 | return rc; |
433 | } |
434 | |
435 | /** |
436 | * nfc_deactivate_target - deactivate a nfc target |
437 | * |
438 | * @dev: The nfc device that found the target |
439 | * @target_idx: index of the target that must be deactivated |
440 | * @mode: idle or sleep? |
441 | */ |
442 | int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx, u8 mode) |
443 | { |
444 | int rc = 0; |
445 | |
446 | pr_debug("dev_name=%s target_idx=%u\n" , |
447 | dev_name(&dev->dev), target_idx); |
448 | |
449 | device_lock(dev: &dev->dev); |
450 | |
451 | if (dev->shutting_down) { |
452 | rc = -ENODEV; |
453 | goto error; |
454 | } |
455 | |
456 | if (dev->active_target == NULL) { |
457 | rc = -ENOTCONN; |
458 | goto error; |
459 | } |
460 | |
461 | if (dev->active_target->idx != target_idx) { |
462 | rc = -ENOTCONN; |
463 | goto error; |
464 | } |
465 | |
466 | if (dev->ops->check_presence) |
467 | del_timer_sync(timer: &dev->check_pres_timer); |
468 | |
469 | dev->ops->deactivate_target(dev, dev->active_target, mode); |
470 | dev->active_target = NULL; |
471 | |
472 | error: |
473 | device_unlock(dev: &dev->dev); |
474 | return rc; |
475 | } |
476 | |
477 | /** |
478 | * nfc_data_exchange - transceive data |
479 | * |
480 | * @dev: The nfc device that found the target |
481 | * @target_idx: index of the target |
482 | * @skb: data to be sent |
483 | * @cb: callback called when the response is received |
484 | * @cb_context: parameter for the callback function |
485 | * |
486 | * The user must wait for the callback before calling this function again. |
487 | */ |
488 | int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb, |
489 | data_exchange_cb_t cb, void *cb_context) |
490 | { |
491 | int rc; |
492 | |
493 | pr_debug("dev_name=%s target_idx=%u skb->len=%u\n" , |
494 | dev_name(&dev->dev), target_idx, skb->len); |
495 | |
496 | device_lock(dev: &dev->dev); |
497 | |
498 | if (dev->shutting_down) { |
499 | rc = -ENODEV; |
500 | kfree_skb(skb); |
501 | goto error; |
502 | } |
503 | |
504 | if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) { |
505 | if (dev->active_target->idx != target_idx) { |
506 | rc = -EADDRNOTAVAIL; |
507 | kfree_skb(skb); |
508 | goto error; |
509 | } |
510 | |
511 | if (dev->ops->check_presence) |
512 | del_timer_sync(timer: &dev->check_pres_timer); |
513 | |
514 | rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb, |
515 | cb_context); |
516 | |
517 | if (!rc && dev->ops->check_presence && !dev->shutting_down) |
518 | mod_timer(timer: &dev->check_pres_timer, expires: jiffies + |
519 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); |
520 | } else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) { |
521 | rc = dev->ops->tm_send(dev, skb); |
522 | } else { |
523 | rc = -ENOTCONN; |
524 | kfree_skb(skb); |
525 | goto error; |
526 | } |
527 | |
528 | |
529 | error: |
530 | device_unlock(dev: &dev->dev); |
531 | return rc; |
532 | } |
533 | |
534 | struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx) |
535 | { |
536 | struct nfc_se *se; |
537 | |
538 | list_for_each_entry(se, &dev->secure_elements, list) |
539 | if (se->idx == se_idx) |
540 | return se; |
541 | |
542 | return NULL; |
543 | } |
544 | EXPORT_SYMBOL(nfc_find_se); |
545 | |
546 | int nfc_enable_se(struct nfc_dev *dev, u32 se_idx) |
547 | { |
548 | struct nfc_se *se; |
549 | int rc; |
550 | |
551 | pr_debug("%s se index %d\n" , dev_name(&dev->dev), se_idx); |
552 | |
553 | device_lock(dev: &dev->dev); |
554 | |
555 | if (dev->shutting_down) { |
556 | rc = -ENODEV; |
557 | goto error; |
558 | } |
559 | |
560 | if (!dev->dev_up) { |
561 | rc = -ENODEV; |
562 | goto error; |
563 | } |
564 | |
565 | if (dev->polling) { |
566 | rc = -EBUSY; |
567 | goto error; |
568 | } |
569 | |
570 | if (!dev->ops->enable_se || !dev->ops->disable_se) { |
571 | rc = -EOPNOTSUPP; |
572 | goto error; |
573 | } |
574 | |
575 | se = nfc_find_se(dev, se_idx); |
576 | if (!se) { |
577 | rc = -EINVAL; |
578 | goto error; |
579 | } |
580 | |
581 | if (se->state == NFC_SE_ENABLED) { |
582 | rc = -EALREADY; |
583 | goto error; |
584 | } |
585 | |
586 | rc = dev->ops->enable_se(dev, se_idx); |
587 | if (rc >= 0) |
588 | se->state = NFC_SE_ENABLED; |
589 | |
590 | error: |
591 | device_unlock(dev: &dev->dev); |
592 | return rc; |
593 | } |
594 | |
595 | int nfc_disable_se(struct nfc_dev *dev, u32 se_idx) |
596 | { |
597 | struct nfc_se *se; |
598 | int rc; |
599 | |
600 | pr_debug("%s se index %d\n" , dev_name(&dev->dev), se_idx); |
601 | |
602 | device_lock(dev: &dev->dev); |
603 | |
604 | if (dev->shutting_down) { |
605 | rc = -ENODEV; |
606 | goto error; |
607 | } |
608 | |
609 | if (!dev->dev_up) { |
610 | rc = -ENODEV; |
611 | goto error; |
612 | } |
613 | |
614 | if (!dev->ops->enable_se || !dev->ops->disable_se) { |
615 | rc = -EOPNOTSUPP; |
616 | goto error; |
617 | } |
618 | |
619 | se = nfc_find_se(dev, se_idx); |
620 | if (!se) { |
621 | rc = -EINVAL; |
622 | goto error; |
623 | } |
624 | |
625 | if (se->state == NFC_SE_DISABLED) { |
626 | rc = -EALREADY; |
627 | goto error; |
628 | } |
629 | |
630 | rc = dev->ops->disable_se(dev, se_idx); |
631 | if (rc >= 0) |
632 | se->state = NFC_SE_DISABLED; |
633 | |
634 | error: |
635 | device_unlock(dev: &dev->dev); |
636 | return rc; |
637 | } |
638 | |
639 | int nfc_set_remote_general_bytes(struct nfc_dev *dev, const u8 *gb, u8 gb_len) |
640 | { |
641 | pr_debug("dev_name=%s gb_len=%d\n" , dev_name(&dev->dev), gb_len); |
642 | |
643 | return nfc_llcp_set_remote_gb(dev, gb, gb_len); |
644 | } |
645 | EXPORT_SYMBOL(nfc_set_remote_general_bytes); |
646 | |
647 | u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len) |
648 | { |
649 | pr_debug("dev_name=%s\n" , dev_name(&dev->dev)); |
650 | |
651 | return nfc_llcp_general_bytes(dev, general_bytes_len: gb_len); |
652 | } |
653 | EXPORT_SYMBOL(nfc_get_local_general_bytes); |
654 | |
655 | int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb) |
656 | { |
657 | /* Only LLCP target mode for now */ |
658 | if (dev->dep_link_up == false) { |
659 | kfree_skb(skb); |
660 | return -ENOLINK; |
661 | } |
662 | |
663 | return nfc_llcp_data_received(dev, skb); |
664 | } |
665 | EXPORT_SYMBOL(nfc_tm_data_received); |
666 | |
667 | int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode, |
668 | const u8 *gb, size_t gb_len) |
669 | { |
670 | int rc; |
671 | |
672 | device_lock(dev: &dev->dev); |
673 | |
674 | dev->polling = false; |
675 | |
676 | if (gb != NULL) { |
677 | rc = nfc_set_remote_general_bytes(dev, gb, gb_len); |
678 | if (rc < 0) |
679 | goto out; |
680 | } |
681 | |
682 | dev->rf_mode = NFC_RF_TARGET; |
683 | |
684 | if (protocol == NFC_PROTO_NFC_DEP_MASK) |
685 | nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET); |
686 | |
687 | rc = nfc_genl_tm_activated(dev, protocol); |
688 | |
689 | out: |
690 | device_unlock(dev: &dev->dev); |
691 | |
692 | return rc; |
693 | } |
694 | EXPORT_SYMBOL(nfc_tm_activated); |
695 | |
696 | int nfc_tm_deactivated(struct nfc_dev *dev) |
697 | { |
698 | dev->dep_link_up = false; |
699 | dev->rf_mode = NFC_RF_NONE; |
700 | |
701 | return nfc_genl_tm_deactivated(dev); |
702 | } |
703 | EXPORT_SYMBOL(nfc_tm_deactivated); |
704 | |
705 | /** |
706 | * nfc_alloc_send_skb - allocate a skb for data exchange responses |
707 | * |
708 | * @dev: device sending the response |
709 | * @sk: socket sending the response |
710 | * @flags: MSG_DONTWAIT flag |
711 | * @size: size to allocate |
712 | * @err: pointer to memory to store the error code |
713 | */ |
714 | struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk, |
715 | unsigned int flags, unsigned int size, |
716 | unsigned int *err) |
717 | { |
718 | struct sk_buff *skb; |
719 | unsigned int total_size; |
720 | |
721 | total_size = size + |
722 | dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; |
723 | |
724 | skb = sock_alloc_send_skb(sk, size: total_size, noblock: flags & MSG_DONTWAIT, errcode: err); |
725 | if (skb) |
726 | skb_reserve(skb, len: dev->tx_headroom + NFC_HEADER_SIZE); |
727 | |
728 | return skb; |
729 | } |
730 | |
731 | /** |
732 | * nfc_alloc_recv_skb - allocate a skb for data exchange responses |
733 | * |
734 | * @size: size to allocate |
735 | * @gfp: gfp flags |
736 | */ |
737 | struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp) |
738 | { |
739 | struct sk_buff *skb; |
740 | unsigned int total_size; |
741 | |
742 | total_size = size + 1; |
743 | skb = alloc_skb(size: total_size, priority: gfp); |
744 | |
745 | if (skb) |
746 | skb_reserve(skb, len: 1); |
747 | |
748 | return skb; |
749 | } |
750 | EXPORT_SYMBOL(nfc_alloc_recv_skb); |
751 | |
752 | /** |
753 | * nfc_targets_found - inform that targets were found |
754 | * |
755 | * @dev: The nfc device that found the targets |
756 | * @targets: array of nfc targets found |
757 | * @n_targets: targets array size |
758 | * |
759 | * The device driver must call this function when one or many nfc targets |
760 | * are found. After calling this function, the device driver must stop |
761 | * polling for targets. |
762 | * NOTE: This function can be called with targets=NULL and n_targets=0 to |
763 | * notify a driver error, meaning that the polling operation cannot complete. |
764 | * IMPORTANT: this function must not be called from an atomic context. |
765 | * In addition, it must also not be called from a context that would prevent |
766 | * the NFC Core to call other nfc ops entry point concurrently. |
767 | */ |
768 | int nfc_targets_found(struct nfc_dev *dev, |
769 | struct nfc_target *targets, int n_targets) |
770 | { |
771 | int i; |
772 | |
773 | pr_debug("dev_name=%s n_targets=%d\n" , dev_name(&dev->dev), n_targets); |
774 | |
775 | for (i = 0; i < n_targets; i++) |
776 | targets[i].idx = dev->target_next_idx++; |
777 | |
778 | device_lock(dev: &dev->dev); |
779 | |
780 | if (dev->polling == false) { |
781 | device_unlock(dev: &dev->dev); |
782 | return 0; |
783 | } |
784 | |
785 | dev->polling = false; |
786 | |
787 | dev->targets_generation++; |
788 | |
789 | kfree(objp: dev->targets); |
790 | dev->targets = NULL; |
791 | |
792 | if (targets) { |
793 | dev->targets = kmemdup(p: targets, |
794 | size: n_targets * sizeof(struct nfc_target), |
795 | GFP_ATOMIC); |
796 | |
797 | if (!dev->targets) { |
798 | dev->n_targets = 0; |
799 | device_unlock(dev: &dev->dev); |
800 | return -ENOMEM; |
801 | } |
802 | } |
803 | |
804 | dev->n_targets = n_targets; |
805 | device_unlock(dev: &dev->dev); |
806 | |
807 | nfc_genl_targets_found(dev); |
808 | |
809 | return 0; |
810 | } |
811 | EXPORT_SYMBOL(nfc_targets_found); |
812 | |
813 | /** |
814 | * nfc_target_lost - inform that an activated target went out of field |
815 | * |
816 | * @dev: The nfc device that had the activated target in field |
817 | * @target_idx: the nfc index of the target |
818 | * |
819 | * The device driver must call this function when the activated target |
820 | * goes out of the field. |
821 | * IMPORTANT: this function must not be called from an atomic context. |
822 | * In addition, it must also not be called from a context that would prevent |
823 | * the NFC Core to call other nfc ops entry point concurrently. |
824 | */ |
825 | int nfc_target_lost(struct nfc_dev *dev, u32 target_idx) |
826 | { |
827 | const struct nfc_target *tg; |
828 | int i; |
829 | |
830 | pr_debug("dev_name %s n_target %d\n" , dev_name(&dev->dev), target_idx); |
831 | |
832 | device_lock(dev: &dev->dev); |
833 | |
834 | for (i = 0; i < dev->n_targets; i++) { |
835 | tg = &dev->targets[i]; |
836 | if (tg->idx == target_idx) |
837 | break; |
838 | } |
839 | |
840 | if (i == dev->n_targets) { |
841 | device_unlock(dev: &dev->dev); |
842 | return -EINVAL; |
843 | } |
844 | |
845 | dev->targets_generation++; |
846 | dev->n_targets--; |
847 | dev->active_target = NULL; |
848 | |
849 | if (dev->n_targets) { |
850 | memcpy(&dev->targets[i], &dev->targets[i + 1], |
851 | (dev->n_targets - i) * sizeof(struct nfc_target)); |
852 | } else { |
853 | kfree(objp: dev->targets); |
854 | dev->targets = NULL; |
855 | } |
856 | |
857 | device_unlock(dev: &dev->dev); |
858 | |
859 | nfc_genl_target_lost(dev, target_idx); |
860 | |
861 | return 0; |
862 | } |
863 | EXPORT_SYMBOL(nfc_target_lost); |
864 | |
865 | inline void nfc_driver_failure(struct nfc_dev *dev, int err) |
866 | { |
867 | nfc_targets_found(dev, NULL, 0); |
868 | } |
869 | EXPORT_SYMBOL(nfc_driver_failure); |
870 | |
871 | int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type) |
872 | { |
873 | struct nfc_se *se; |
874 | int rc; |
875 | |
876 | pr_debug("%s se index %d\n" , dev_name(&dev->dev), se_idx); |
877 | |
878 | se = nfc_find_se(dev, se_idx); |
879 | if (se) |
880 | return -EALREADY; |
881 | |
882 | se = kzalloc(size: sizeof(struct nfc_se), GFP_KERNEL); |
883 | if (!se) |
884 | return -ENOMEM; |
885 | |
886 | se->idx = se_idx; |
887 | se->type = type; |
888 | se->state = NFC_SE_DISABLED; |
889 | INIT_LIST_HEAD(list: &se->list); |
890 | |
891 | list_add(new: &se->list, head: &dev->secure_elements); |
892 | |
893 | rc = nfc_genl_se_added(dev, se_idx, type); |
894 | if (rc < 0) { |
895 | list_del(entry: &se->list); |
896 | kfree(objp: se); |
897 | |
898 | return rc; |
899 | } |
900 | |
901 | return 0; |
902 | } |
903 | EXPORT_SYMBOL(nfc_add_se); |
904 | |
905 | int nfc_remove_se(struct nfc_dev *dev, u32 se_idx) |
906 | { |
907 | struct nfc_se *se, *n; |
908 | int rc; |
909 | |
910 | pr_debug("%s se index %d\n" , dev_name(&dev->dev), se_idx); |
911 | |
912 | list_for_each_entry_safe(se, n, &dev->secure_elements, list) |
913 | if (se->idx == se_idx) { |
914 | rc = nfc_genl_se_removed(dev, se_idx); |
915 | if (rc < 0) |
916 | return rc; |
917 | |
918 | list_del(entry: &se->list); |
919 | kfree(objp: se); |
920 | |
921 | return 0; |
922 | } |
923 | |
924 | return -EINVAL; |
925 | } |
926 | EXPORT_SYMBOL(nfc_remove_se); |
927 | |
928 | int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx, |
929 | struct nfc_evt_transaction *evt_transaction) |
930 | { |
931 | int rc; |
932 | |
933 | pr_debug("transaction: %x\n" , se_idx); |
934 | |
935 | device_lock(dev: &dev->dev); |
936 | |
937 | if (!evt_transaction) { |
938 | rc = -EPROTO; |
939 | goto out; |
940 | } |
941 | |
942 | rc = nfc_genl_se_transaction(dev, se_idx, evt_transaction); |
943 | out: |
944 | device_unlock(dev: &dev->dev); |
945 | return rc; |
946 | } |
947 | EXPORT_SYMBOL(nfc_se_transaction); |
948 | |
949 | int nfc_se_connectivity(struct nfc_dev *dev, u8 se_idx) |
950 | { |
951 | int rc; |
952 | |
953 | pr_debug("connectivity: %x\n" , se_idx); |
954 | |
955 | device_lock(dev: &dev->dev); |
956 | rc = nfc_genl_se_connectivity(dev, se_idx); |
957 | device_unlock(dev: &dev->dev); |
958 | return rc; |
959 | } |
960 | EXPORT_SYMBOL(nfc_se_connectivity); |
961 | |
962 | static void nfc_release(struct device *d) |
963 | { |
964 | struct nfc_dev *dev = to_nfc_dev(d); |
965 | struct nfc_se *se, *n; |
966 | |
967 | pr_debug("dev_name=%s\n" , dev_name(&dev->dev)); |
968 | |
969 | nfc_genl_data_exit(genl_data: &dev->genl_data); |
970 | kfree(objp: dev->targets); |
971 | |
972 | list_for_each_entry_safe(se, n, &dev->secure_elements, list) { |
973 | nfc_genl_se_removed(dev, se_idx: se->idx); |
974 | list_del(entry: &se->list); |
975 | kfree(objp: se); |
976 | } |
977 | |
978 | ida_free(&nfc_index_ida, id: dev->idx); |
979 | |
980 | kfree(objp: dev); |
981 | } |
982 | |
983 | static void nfc_check_pres_work(struct work_struct *work) |
984 | { |
985 | struct nfc_dev *dev = container_of(work, struct nfc_dev, |
986 | check_pres_work); |
987 | int rc; |
988 | |
989 | device_lock(dev: &dev->dev); |
990 | |
991 | if (dev->active_target && timer_pending(timer: &dev->check_pres_timer) == 0) { |
992 | rc = dev->ops->check_presence(dev, dev->active_target); |
993 | if (rc == -EOPNOTSUPP) |
994 | goto exit; |
995 | if (rc) { |
996 | u32 active_target_idx = dev->active_target->idx; |
997 | device_unlock(dev: &dev->dev); |
998 | nfc_target_lost(dev, active_target_idx); |
999 | return; |
1000 | } |
1001 | |
1002 | if (!dev->shutting_down) |
1003 | mod_timer(timer: &dev->check_pres_timer, expires: jiffies + |
1004 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); |
1005 | } |
1006 | |
1007 | exit: |
1008 | device_unlock(dev: &dev->dev); |
1009 | } |
1010 | |
1011 | static void nfc_check_pres_timeout(struct timer_list *t) |
1012 | { |
1013 | struct nfc_dev *dev = from_timer(dev, t, check_pres_timer); |
1014 | |
1015 | schedule_work(work: &dev->check_pres_work); |
1016 | } |
1017 | |
1018 | struct class nfc_class = { |
1019 | .name = "nfc" , |
1020 | .dev_release = nfc_release, |
1021 | }; |
1022 | EXPORT_SYMBOL(nfc_class); |
1023 | |
1024 | static int match_idx(struct device *d, const void *data) |
1025 | { |
1026 | struct nfc_dev *dev = to_nfc_dev(d); |
1027 | const unsigned int *idx = data; |
1028 | |
1029 | return dev->idx == *idx; |
1030 | } |
1031 | |
1032 | struct nfc_dev *nfc_get_device(unsigned int idx) |
1033 | { |
1034 | struct device *d; |
1035 | |
1036 | d = class_find_device(class: &nfc_class, NULL, data: &idx, match: match_idx); |
1037 | if (!d) |
1038 | return NULL; |
1039 | |
1040 | return to_nfc_dev(d); |
1041 | } |
1042 | |
1043 | /** |
1044 | * nfc_allocate_device - allocate a new nfc device |
1045 | * |
1046 | * @ops: device operations |
1047 | * @supported_protocols: NFC protocols supported by the device |
1048 | * @tx_headroom: reserved space at beginning of skb |
1049 | * @tx_tailroom: reserved space at end of skb |
1050 | */ |
1051 | struct nfc_dev *nfc_allocate_device(const struct nfc_ops *ops, |
1052 | u32 supported_protocols, |
1053 | int tx_headroom, int tx_tailroom) |
1054 | { |
1055 | struct nfc_dev *dev; |
1056 | int rc; |
1057 | |
1058 | if (!ops->start_poll || !ops->stop_poll || !ops->activate_target || |
1059 | !ops->deactivate_target || !ops->im_transceive) |
1060 | return NULL; |
1061 | |
1062 | if (!supported_protocols) |
1063 | return NULL; |
1064 | |
1065 | dev = kzalloc(size: sizeof(struct nfc_dev), GFP_KERNEL); |
1066 | if (!dev) |
1067 | return NULL; |
1068 | |
1069 | rc = ida_alloc(ida: &nfc_index_ida, GFP_KERNEL); |
1070 | if (rc < 0) |
1071 | goto err_free_dev; |
1072 | dev->idx = rc; |
1073 | |
1074 | dev->dev.class = &nfc_class; |
1075 | dev_set_name(dev: &dev->dev, name: "nfc%d" , dev->idx); |
1076 | device_initialize(dev: &dev->dev); |
1077 | |
1078 | dev->ops = ops; |
1079 | dev->supported_protocols = supported_protocols; |
1080 | dev->tx_headroom = tx_headroom; |
1081 | dev->tx_tailroom = tx_tailroom; |
1082 | INIT_LIST_HEAD(list: &dev->secure_elements); |
1083 | |
1084 | nfc_genl_data_init(genl_data: &dev->genl_data); |
1085 | |
1086 | dev->rf_mode = NFC_RF_NONE; |
1087 | |
1088 | /* first generation must not be 0 */ |
1089 | dev->targets_generation = 1; |
1090 | |
1091 | if (ops->check_presence) { |
1092 | timer_setup(&dev->check_pres_timer, nfc_check_pres_timeout, 0); |
1093 | INIT_WORK(&dev->check_pres_work, nfc_check_pres_work); |
1094 | } |
1095 | |
1096 | return dev; |
1097 | |
1098 | err_free_dev: |
1099 | kfree(objp: dev); |
1100 | |
1101 | return NULL; |
1102 | } |
1103 | EXPORT_SYMBOL(nfc_allocate_device); |
1104 | |
1105 | /** |
1106 | * nfc_register_device - register a nfc device in the nfc subsystem |
1107 | * |
1108 | * @dev: The nfc device to register |
1109 | */ |
1110 | int nfc_register_device(struct nfc_dev *dev) |
1111 | { |
1112 | int rc; |
1113 | |
1114 | pr_debug("dev_name=%s\n" , dev_name(&dev->dev)); |
1115 | |
1116 | mutex_lock(&nfc_devlist_mutex); |
1117 | nfc_devlist_generation++; |
1118 | rc = device_add(dev: &dev->dev); |
1119 | mutex_unlock(lock: &nfc_devlist_mutex); |
1120 | |
1121 | if (rc < 0) |
1122 | return rc; |
1123 | |
1124 | rc = nfc_llcp_register_device(dev); |
1125 | if (rc) |
1126 | pr_err("Could not register llcp device\n" ); |
1127 | |
1128 | device_lock(dev: &dev->dev); |
1129 | dev->rfkill = rfkill_alloc(name: dev_name(dev: &dev->dev), parent: &dev->dev, |
1130 | type: RFKILL_TYPE_NFC, ops: &nfc_rfkill_ops, ops_data: dev); |
1131 | if (dev->rfkill) { |
1132 | if (rfkill_register(rfkill: dev->rfkill) < 0) { |
1133 | rfkill_destroy(rfkill: dev->rfkill); |
1134 | dev->rfkill = NULL; |
1135 | } |
1136 | } |
1137 | dev->shutting_down = false; |
1138 | device_unlock(dev: &dev->dev); |
1139 | |
1140 | rc = nfc_genl_device_added(dev); |
1141 | if (rc) |
1142 | pr_debug("The userspace won't be notified that the device %s was added\n" , |
1143 | dev_name(&dev->dev)); |
1144 | |
1145 | return 0; |
1146 | } |
1147 | EXPORT_SYMBOL(nfc_register_device); |
1148 | |
1149 | /** |
1150 | * nfc_unregister_device - unregister a nfc device in the nfc subsystem |
1151 | * |
1152 | * @dev: The nfc device to unregister |
1153 | */ |
1154 | void nfc_unregister_device(struct nfc_dev *dev) |
1155 | { |
1156 | int rc; |
1157 | |
1158 | pr_debug("dev_name=%s\n" , dev_name(&dev->dev)); |
1159 | |
1160 | rc = nfc_genl_device_removed(dev); |
1161 | if (rc) |
1162 | pr_debug("The userspace won't be notified that the device %s " |
1163 | "was removed\n" , dev_name(&dev->dev)); |
1164 | |
1165 | device_lock(dev: &dev->dev); |
1166 | if (dev->rfkill) { |
1167 | rfkill_unregister(rfkill: dev->rfkill); |
1168 | rfkill_destroy(rfkill: dev->rfkill); |
1169 | dev->rfkill = NULL; |
1170 | } |
1171 | dev->shutting_down = true; |
1172 | device_unlock(dev: &dev->dev); |
1173 | |
1174 | if (dev->ops->check_presence) { |
1175 | del_timer_sync(timer: &dev->check_pres_timer); |
1176 | cancel_work_sync(work: &dev->check_pres_work); |
1177 | } |
1178 | |
1179 | nfc_llcp_unregister_device(dev); |
1180 | |
1181 | mutex_lock(&nfc_devlist_mutex); |
1182 | nfc_devlist_generation++; |
1183 | device_del(dev: &dev->dev); |
1184 | mutex_unlock(lock: &nfc_devlist_mutex); |
1185 | } |
1186 | EXPORT_SYMBOL(nfc_unregister_device); |
1187 | |
1188 | static int __init nfc_init(void) |
1189 | { |
1190 | int rc; |
1191 | |
1192 | pr_info("NFC Core ver %s\n" , VERSION); |
1193 | |
1194 | rc = class_register(class: &nfc_class); |
1195 | if (rc) |
1196 | return rc; |
1197 | |
1198 | rc = nfc_genl_init(); |
1199 | if (rc) |
1200 | goto err_genl; |
1201 | |
1202 | /* the first generation must not be 0 */ |
1203 | nfc_devlist_generation = 1; |
1204 | |
1205 | rc = rawsock_init(); |
1206 | if (rc) |
1207 | goto err_rawsock; |
1208 | |
1209 | rc = nfc_llcp_init(); |
1210 | if (rc) |
1211 | goto err_llcp_sock; |
1212 | |
1213 | rc = af_nfc_init(); |
1214 | if (rc) |
1215 | goto err_af_nfc; |
1216 | |
1217 | return 0; |
1218 | |
1219 | err_af_nfc: |
1220 | nfc_llcp_exit(); |
1221 | err_llcp_sock: |
1222 | rawsock_exit(); |
1223 | err_rawsock: |
1224 | nfc_genl_exit(); |
1225 | err_genl: |
1226 | class_unregister(class: &nfc_class); |
1227 | return rc; |
1228 | } |
1229 | |
1230 | static void __exit nfc_exit(void) |
1231 | { |
1232 | af_nfc_exit(); |
1233 | nfc_llcp_exit(); |
1234 | rawsock_exit(); |
1235 | nfc_genl_exit(); |
1236 | class_unregister(class: &nfc_class); |
1237 | } |
1238 | |
1239 | subsys_initcall(nfc_init); |
1240 | module_exit(nfc_exit); |
1241 | |
1242 | MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>" ); |
1243 | MODULE_DESCRIPTION("NFC Core ver " VERSION); |
1244 | MODULE_VERSION(VERSION); |
1245 | MODULE_LICENSE("GPL" ); |
1246 | MODULE_ALIAS_NETPROTO(PF_NFC); |
1247 | MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME); |
1248 | |