diff options
Diffstat (limited to 'net/nfc/nci/core.c')
-rw-r--r-- | net/nfc/nci/core.c | 797 |
1 files changed, 797 insertions, 0 deletions
diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c new file mode 100644 index 00000000000..4047e29acb3 --- /dev/null +++ b/net/nfc/nci/core.c | |||
@@ -0,0 +1,797 @@ | |||
1 | /* | ||
2 | * The NFC Controller Interface is the communication protocol between an | ||
3 | * NFC Controller (NFCC) and a Device Host (DH). | ||
4 | * | ||
5 | * Copyright (C) 2011 Texas Instruments, Inc. | ||
6 | * | ||
7 | * Written by Ilan Elias <ilane@ti.com> | ||
8 | * | ||
9 | * Acknowledgements: | ||
10 | * This file is based on hci_core.c, which was written | ||
11 | * by Maxim Krasnyansky. | ||
12 | * | ||
13 | * This program is free software; you can redistribute it and/or modify | ||
14 | * it under the terms of the GNU General Public License version 2 | ||
15 | * as published by the Free Software Foundation | ||
16 | * | ||
17 | * This program is distributed in the hope that it will be useful, | ||
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
20 | * GNU General Public License for more details. | ||
21 | * | ||
22 | * You should have received a copy of the GNU General Public License | ||
23 | * along with this program; if not, write to the Free Software | ||
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
25 | * | ||
26 | */ | ||
27 | |||
28 | #include <linux/types.h> | ||
29 | #include <linux/workqueue.h> | ||
30 | #include <linux/completion.h> | ||
31 | #include <linux/sched.h> | ||
32 | #include <linux/bitops.h> | ||
33 | #include <linux/skbuff.h> | ||
34 | |||
35 | #include "../nfc.h" | ||
36 | #include <net/nfc/nci.h> | ||
37 | #include <net/nfc/nci_core.h> | ||
38 | #include <linux/nfc.h> | ||
39 | |||
40 | static void nci_cmd_work(struct work_struct *work); | ||
41 | static void nci_rx_work(struct work_struct *work); | ||
42 | static void nci_tx_work(struct work_struct *work); | ||
43 | |||
44 | /* ---- NCI requests ---- */ | ||
45 | |||
46 | void nci_req_complete(struct nci_dev *ndev, int result) | ||
47 | { | ||
48 | if (ndev->req_status == NCI_REQ_PEND) { | ||
49 | ndev->req_result = result; | ||
50 | ndev->req_status = NCI_REQ_DONE; | ||
51 | complete(&ndev->req_completion); | ||
52 | } | ||
53 | } | ||
54 | |||
55 | static void nci_req_cancel(struct nci_dev *ndev, int err) | ||
56 | { | ||
57 | if (ndev->req_status == NCI_REQ_PEND) { | ||
58 | ndev->req_result = err; | ||
59 | ndev->req_status = NCI_REQ_CANCELED; | ||
60 | complete(&ndev->req_completion); | ||
61 | } | ||
62 | } | ||
63 | |||
64 | /* Execute request and wait for completion. */ | ||
65 | static int __nci_request(struct nci_dev *ndev, | ||
66 | void (*req)(struct nci_dev *ndev, unsigned long opt), | ||
67 | unsigned long opt, | ||
68 | __u32 timeout) | ||
69 | { | ||
70 | int rc = 0; | ||
71 | unsigned long completion_rc; | ||
72 | |||
73 | ndev->req_status = NCI_REQ_PEND; | ||
74 | |||
75 | init_completion(&ndev->req_completion); | ||
76 | req(ndev, opt); | ||
77 | completion_rc = wait_for_completion_interruptible_timeout( | ||
78 | &ndev->req_completion, | ||
79 | timeout); | ||
80 | |||
81 | nfc_dbg("wait_for_completion return %ld", completion_rc); | ||
82 | |||
83 | if (completion_rc > 0) { | ||
84 | switch (ndev->req_status) { | ||
85 | case NCI_REQ_DONE: | ||
86 | rc = nci_to_errno(ndev->req_result); | ||
87 | break; | ||
88 | |||
89 | case NCI_REQ_CANCELED: | ||
90 | rc = -ndev->req_result; | ||
91 | break; | ||
92 | |||
93 | default: | ||
94 | rc = -ETIMEDOUT; | ||
95 | break; | ||
96 | } | ||
97 | } else { | ||
98 | nfc_err("wait_for_completion_interruptible_timeout failed %ld", | ||
99 | completion_rc); | ||
100 | |||
101 | rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc)); | ||
102 | } | ||
103 | |||
104 | ndev->req_status = ndev->req_result = 0; | ||
105 | |||
106 | return rc; | ||
107 | } | ||
108 | |||
109 | static inline int nci_request(struct nci_dev *ndev, | ||
110 | void (*req)(struct nci_dev *ndev, unsigned long opt), | ||
111 | unsigned long opt, __u32 timeout) | ||
112 | { | ||
113 | int rc; | ||
114 | |||
115 | if (!test_bit(NCI_UP, &ndev->flags)) | ||
116 | return -ENETDOWN; | ||
117 | |||
118 | /* Serialize all requests */ | ||
119 | mutex_lock(&ndev->req_lock); | ||
120 | rc = __nci_request(ndev, req, opt, timeout); | ||
121 | mutex_unlock(&ndev->req_lock); | ||
122 | |||
123 | return rc; | ||
124 | } | ||
125 | |||
126 | static void nci_reset_req(struct nci_dev *ndev, unsigned long opt) | ||
127 | { | ||
128 | nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 0, NULL); | ||
129 | } | ||
130 | |||
131 | static void nci_init_req(struct nci_dev *ndev, unsigned long opt) | ||
132 | { | ||
133 | nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL); | ||
134 | } | ||
135 | |||
136 | static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt) | ||
137 | { | ||
138 | struct nci_core_conn_create_cmd conn_cmd; | ||
139 | struct nci_rf_disc_map_cmd cmd; | ||
140 | struct disc_map_config *cfg = cmd.mapping_configs; | ||
141 | __u8 *num = &cmd.num_mapping_configs; | ||
142 | int i; | ||
143 | |||
144 | /* create static rf connection */ | ||
145 | conn_cmd.target_handle = 0; | ||
146 | conn_cmd.num_target_specific_params = 0; | ||
147 | nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, 2, &conn_cmd); | ||
148 | |||
149 | /* set rf mapping configurations */ | ||
150 | *num = 0; | ||
151 | |||
152 | /* by default mapping is set to NCI_RF_INTERFACE_FRAME */ | ||
153 | for (i = 0; i < ndev->num_supported_rf_interfaces; i++) { | ||
154 | if (ndev->supported_rf_interfaces[i] == | ||
155 | NCI_RF_INTERFACE_ISO_DEP) { | ||
156 | cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; | ||
157 | cfg[*num].mode = NCI_DISC_MAP_MODE_BOTH; | ||
158 | cfg[*num].rf_interface_type = NCI_RF_INTERFACE_ISO_DEP; | ||
159 | (*num)++; | ||
160 | } else if (ndev->supported_rf_interfaces[i] == | ||
161 | NCI_RF_INTERFACE_NFC_DEP) { | ||
162 | cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; | ||
163 | cfg[*num].mode = NCI_DISC_MAP_MODE_BOTH; | ||
164 | cfg[*num].rf_interface_type = NCI_RF_INTERFACE_NFC_DEP; | ||
165 | (*num)++; | ||
166 | } | ||
167 | |||
168 | if (*num == NCI_MAX_NUM_MAPPING_CONFIGS) | ||
169 | break; | ||
170 | } | ||
171 | |||
172 | nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD, | ||
173 | (1 + ((*num)*sizeof(struct disc_map_config))), | ||
174 | &cmd); | ||
175 | } | ||
176 | |||
177 | static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) | ||
178 | { | ||
179 | struct nci_rf_disc_cmd cmd; | ||
180 | __u32 protocols = opt; | ||
181 | |||
182 | cmd.num_disc_configs = 0; | ||
183 | |||
184 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | ||
185 | (protocols & NFC_PROTO_JEWEL_MASK | ||
186 | || protocols & NFC_PROTO_MIFARE_MASK | ||
187 | || protocols & NFC_PROTO_ISO14443_MASK | ||
188 | || protocols & NFC_PROTO_NFC_DEP_MASK)) { | ||
189 | cmd.disc_configs[cmd.num_disc_configs].type = | ||
190 | NCI_DISCOVERY_TYPE_POLL_A_PASSIVE; | ||
191 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; | ||
192 | cmd.num_disc_configs++; | ||
193 | } | ||
194 | |||
195 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | ||
196 | (protocols & NFC_PROTO_ISO14443_MASK)) { | ||
197 | cmd.disc_configs[cmd.num_disc_configs].type = | ||
198 | NCI_DISCOVERY_TYPE_POLL_B_PASSIVE; | ||
199 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; | ||
200 | cmd.num_disc_configs++; | ||
201 | } | ||
202 | |||
203 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | ||
204 | (protocols & NFC_PROTO_FELICA_MASK | ||
205 | || protocols & NFC_PROTO_NFC_DEP_MASK)) { | ||
206 | cmd.disc_configs[cmd.num_disc_configs].type = | ||
207 | NCI_DISCOVERY_TYPE_POLL_F_PASSIVE; | ||
208 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; | ||
209 | cmd.num_disc_configs++; | ||
210 | } | ||
211 | |||
212 | nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, | ||
213 | (1 + (cmd.num_disc_configs*sizeof(struct disc_config))), | ||
214 | &cmd); | ||
215 | } | ||
216 | |||
217 | static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) | ||
218 | { | ||
219 | struct nci_rf_deactivate_cmd cmd; | ||
220 | |||
221 | cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE; | ||
222 | |||
223 | nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, | ||
224 | sizeof(struct nci_rf_deactivate_cmd), | ||
225 | &cmd); | ||
226 | } | ||
227 | |||
228 | static int nci_open_device(struct nci_dev *ndev) | ||
229 | { | ||
230 | int rc = 0; | ||
231 | |||
232 | mutex_lock(&ndev->req_lock); | ||
233 | |||
234 | if (test_bit(NCI_UP, &ndev->flags)) { | ||
235 | rc = -EALREADY; | ||
236 | goto done; | ||
237 | } | ||
238 | |||
239 | if (ndev->ops->open(ndev)) { | ||
240 | rc = -EIO; | ||
241 | goto done; | ||
242 | } | ||
243 | |||
244 | atomic_set(&ndev->cmd_cnt, 1); | ||
245 | |||
246 | set_bit(NCI_INIT, &ndev->flags); | ||
247 | |||
248 | rc = __nci_request(ndev, nci_reset_req, 0, | ||
249 | msecs_to_jiffies(NCI_RESET_TIMEOUT)); | ||
250 | |||
251 | if (!rc) { | ||
252 | rc = __nci_request(ndev, nci_init_req, 0, | ||
253 | msecs_to_jiffies(NCI_INIT_TIMEOUT)); | ||
254 | } | ||
255 | |||
256 | if (!rc) { | ||
257 | rc = __nci_request(ndev, nci_init_complete_req, 0, | ||
258 | msecs_to_jiffies(NCI_INIT_TIMEOUT)); | ||
259 | } | ||
260 | |||
261 | clear_bit(NCI_INIT, &ndev->flags); | ||
262 | |||
263 | if (!rc) { | ||
264 | set_bit(NCI_UP, &ndev->flags); | ||
265 | } else { | ||
266 | /* Init failed, cleanup */ | ||
267 | skb_queue_purge(&ndev->cmd_q); | ||
268 | skb_queue_purge(&ndev->rx_q); | ||
269 | skb_queue_purge(&ndev->tx_q); | ||
270 | |||
271 | ndev->ops->close(ndev); | ||
272 | ndev->flags = 0; | ||
273 | } | ||
274 | |||
275 | done: | ||
276 | mutex_unlock(&ndev->req_lock); | ||
277 | return rc; | ||
278 | } | ||
279 | |||
280 | static int nci_close_device(struct nci_dev *ndev) | ||
281 | { | ||
282 | nci_req_cancel(ndev, ENODEV); | ||
283 | mutex_lock(&ndev->req_lock); | ||
284 | |||
285 | if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { | ||
286 | del_timer_sync(&ndev->cmd_timer); | ||
287 | mutex_unlock(&ndev->req_lock); | ||
288 | return 0; | ||
289 | } | ||
290 | |||
291 | /* Drop RX and TX queues */ | ||
292 | skb_queue_purge(&ndev->rx_q); | ||
293 | skb_queue_purge(&ndev->tx_q); | ||
294 | |||
295 | /* Flush RX and TX wq */ | ||
296 | flush_workqueue(ndev->rx_wq); | ||
297 | flush_workqueue(ndev->tx_wq); | ||
298 | |||
299 | /* Reset device */ | ||
300 | skb_queue_purge(&ndev->cmd_q); | ||
301 | atomic_set(&ndev->cmd_cnt, 1); | ||
302 | |||
303 | set_bit(NCI_INIT, &ndev->flags); | ||
304 | __nci_request(ndev, nci_reset_req, 0, | ||
305 | msecs_to_jiffies(NCI_RESET_TIMEOUT)); | ||
306 | clear_bit(NCI_INIT, &ndev->flags); | ||
307 | |||
308 | /* Flush cmd wq */ | ||
309 | flush_workqueue(ndev->cmd_wq); | ||
310 | |||
311 | /* After this point our queues are empty | ||
312 | * and no works are scheduled. */ | ||
313 | ndev->ops->close(ndev); | ||
314 | |||
315 | /* Clear flags */ | ||
316 | ndev->flags = 0; | ||
317 | |||
318 | mutex_unlock(&ndev->req_lock); | ||
319 | |||
320 | return 0; | ||
321 | } | ||
322 | |||
323 | /* NCI command timer function */ | ||
324 | static void nci_cmd_timer(unsigned long arg) | ||
325 | { | ||
326 | struct nci_dev *ndev = (void *) arg; | ||
327 | |||
328 | nfc_dbg("entry"); | ||
329 | |||
330 | atomic_set(&ndev->cmd_cnt, 1); | ||
331 | queue_work(ndev->cmd_wq, &ndev->cmd_work); | ||
332 | } | ||
333 | |||
334 | static int nci_dev_up(struct nfc_dev *nfc_dev) | ||
335 | { | ||
336 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | ||
337 | |||
338 | nfc_dbg("entry"); | ||
339 | |||
340 | return nci_open_device(ndev); | ||
341 | } | ||
342 | |||
343 | static int nci_dev_down(struct nfc_dev *nfc_dev) | ||
344 | { | ||
345 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | ||
346 | |||
347 | nfc_dbg("entry"); | ||
348 | |||
349 | return nci_close_device(ndev); | ||
350 | } | ||
351 | |||
352 | static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols) | ||
353 | { | ||
354 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | ||
355 | int rc; | ||
356 | |||
357 | nfc_dbg("entry"); | ||
358 | |||
359 | if (test_bit(NCI_DISCOVERY, &ndev->flags)) { | ||
360 | nfc_err("unable to start poll, since poll is already active"); | ||
361 | return -EBUSY; | ||
362 | } | ||
363 | |||
364 | if (ndev->target_active_prot) { | ||
365 | nfc_err("there is an active target"); | ||
366 | return -EBUSY; | ||
367 | } | ||
368 | |||
369 | if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) { | ||
370 | nfc_dbg("target is active, implicitly deactivate..."); | ||
371 | |||
372 | rc = nci_request(ndev, nci_rf_deactivate_req, 0, | ||
373 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); | ||
374 | if (rc) | ||
375 | return -EBUSY; | ||
376 | } | ||
377 | |||
378 | rc = nci_request(ndev, nci_rf_discover_req, protocols, | ||
379 | msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); | ||
380 | |||
381 | if (!rc) | ||
382 | ndev->poll_prots = protocols; | ||
383 | |||
384 | return rc; | ||
385 | } | ||
386 | |||
387 | static void nci_stop_poll(struct nfc_dev *nfc_dev) | ||
388 | { | ||
389 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | ||
390 | |||
391 | nfc_dbg("entry"); | ||
392 | |||
393 | if (!test_bit(NCI_DISCOVERY, &ndev->flags)) { | ||
394 | nfc_err("unable to stop poll, since poll is not active"); | ||
395 | return; | ||
396 | } | ||
397 | |||
398 | nci_request(ndev, nci_rf_deactivate_req, 0, | ||
399 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); | ||
400 | } | ||
401 | |||
402 | static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx, | ||
403 | __u32 protocol) | ||
404 | { | ||
405 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | ||
406 | |||
407 | nfc_dbg("entry, target_idx %d, protocol 0x%x", target_idx, protocol); | ||
408 | |||
409 | if (!test_bit(NCI_POLL_ACTIVE, &ndev->flags)) { | ||
410 | nfc_err("there is no available target to activate"); | ||
411 | return -EINVAL; | ||
412 | } | ||
413 | |||
414 | if (ndev->target_active_prot) { | ||
415 | nfc_err("there is already an active target"); | ||
416 | return -EBUSY; | ||
417 | } | ||
418 | |||
419 | if (!(ndev->target_available_prots & (1 << protocol))) { | ||
420 | nfc_err("target does not support the requested protocol 0x%x", | ||
421 | protocol); | ||
422 | return -EINVAL; | ||
423 | } | ||
424 | |||
425 | ndev->target_active_prot = protocol; | ||
426 | ndev->target_available_prots = 0; | ||
427 | |||
428 | return 0; | ||
429 | } | ||
430 | |||
431 | static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx) | ||
432 | { | ||
433 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | ||
434 | |||
435 | nfc_dbg("entry, target_idx %d", target_idx); | ||
436 | |||
437 | if (!ndev->target_active_prot) { | ||
438 | nfc_err("unable to deactivate target, no active target"); | ||
439 | return; | ||
440 | } | ||
441 | |||
442 | ndev->target_active_prot = 0; | ||
443 | |||
444 | if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) { | ||
445 | nci_request(ndev, nci_rf_deactivate_req, 0, | ||
446 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); | ||
447 | } | ||
448 | } | ||
449 | |||
450 | static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx, | ||
451 | struct sk_buff *skb, | ||
452 | data_exchange_cb_t cb, | ||
453 | void *cb_context) | ||
454 | { | ||
455 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | ||
456 | int rc; | ||
457 | |||
458 | nfc_dbg("entry, target_idx %d, len %d", target_idx, skb->len); | ||
459 | |||
460 | if (!ndev->target_active_prot) { | ||
461 | nfc_err("unable to exchange data, no active target"); | ||
462 | return -EINVAL; | ||
463 | } | ||
464 | |||
465 | if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) | ||
466 | return -EBUSY; | ||
467 | |||
468 | /* store cb and context to be used on receiving data */ | ||
469 | ndev->data_exchange_cb = cb; | ||
470 | ndev->data_exchange_cb_context = cb_context; | ||
471 | |||
472 | rc = nci_send_data(ndev, ndev->conn_id, skb); | ||
473 | if (rc) | ||
474 | clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); | ||
475 | |||
476 | return rc; | ||
477 | } | ||
478 | |||
479 | static struct nfc_ops nci_nfc_ops = { | ||
480 | .dev_up = nci_dev_up, | ||
481 | .dev_down = nci_dev_down, | ||
482 | .start_poll = nci_start_poll, | ||
483 | .stop_poll = nci_stop_poll, | ||
484 | .activate_target = nci_activate_target, | ||
485 | .deactivate_target = nci_deactivate_target, | ||
486 | .data_exchange = nci_data_exchange, | ||
487 | }; | ||
488 | |||
489 | /* ---- Interface to NCI drivers ---- */ | ||
490 | |||
491 | /** | ||
492 | * nci_allocate_device - allocate a new nci device | ||
493 | * | ||
494 | * @ops: device operations | ||
495 | * @supported_protocols: NFC protocols supported by the device | ||
496 | */ | ||
497 | struct nci_dev *nci_allocate_device(struct nci_ops *ops, | ||
498 | __u32 supported_protocols, | ||
499 | int tx_headroom, | ||
500 | int tx_tailroom) | ||
501 | { | ||
502 | struct nci_dev *ndev; | ||
503 | |||
504 | nfc_dbg("entry, supported_protocols 0x%x", supported_protocols); | ||
505 | |||
506 | if (!ops->open || !ops->close || !ops->send) | ||
507 | return NULL; | ||
508 | |||
509 | if (!supported_protocols) | ||
510 | return NULL; | ||
511 | |||
512 | ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); | ||
513 | if (!ndev) | ||
514 | return NULL; | ||
515 | |||
516 | ndev->ops = ops; | ||
517 | ndev->tx_headroom = tx_headroom; | ||
518 | ndev->tx_tailroom = tx_tailroom; | ||
519 | |||
520 | ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, | ||
521 | supported_protocols, | ||
522 | tx_headroom + NCI_DATA_HDR_SIZE, | ||
523 | tx_tailroom); | ||
524 | if (!ndev->nfc_dev) | ||
525 | goto free_exit; | ||
526 | |||
527 | nfc_set_drvdata(ndev->nfc_dev, ndev); | ||
528 | |||
529 | return ndev; | ||
530 | |||
531 | free_exit: | ||
532 | kfree(ndev); | ||
533 | return NULL; | ||
534 | } | ||
535 | EXPORT_SYMBOL(nci_allocate_device); | ||
536 | |||
537 | /** | ||
538 | * nci_free_device - deallocate nci device | ||
539 | * | ||
540 | * @ndev: The nci device to deallocate | ||
541 | */ | ||
542 | void nci_free_device(struct nci_dev *ndev) | ||
543 | { | ||
544 | nfc_dbg("entry"); | ||
545 | |||
546 | nfc_free_device(ndev->nfc_dev); | ||
547 | kfree(ndev); | ||
548 | } | ||
549 | EXPORT_SYMBOL(nci_free_device); | ||
550 | |||
551 | /** | ||
552 | * nci_register_device - register a nci device in the nfc subsystem | ||
553 | * | ||
554 | * @dev: The nci device to register | ||
555 | */ | ||
556 | int nci_register_device(struct nci_dev *ndev) | ||
557 | { | ||
558 | int rc; | ||
559 | struct device *dev = &ndev->nfc_dev->dev; | ||
560 | char name[32]; | ||
561 | |||
562 | nfc_dbg("entry"); | ||
563 | |||
564 | rc = nfc_register_device(ndev->nfc_dev); | ||
565 | if (rc) | ||
566 | goto exit; | ||
567 | |||
568 | ndev->flags = 0; | ||
569 | |||
570 | INIT_WORK(&ndev->cmd_work, nci_cmd_work); | ||
571 | snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); | ||
572 | ndev->cmd_wq = create_singlethread_workqueue(name); | ||
573 | if (!ndev->cmd_wq) { | ||
574 | rc = -ENOMEM; | ||
575 | goto unreg_exit; | ||
576 | } | ||
577 | |||
578 | INIT_WORK(&ndev->rx_work, nci_rx_work); | ||
579 | snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); | ||
580 | ndev->rx_wq = create_singlethread_workqueue(name); | ||
581 | if (!ndev->rx_wq) { | ||
582 | rc = -ENOMEM; | ||
583 | goto destroy_cmd_wq_exit; | ||
584 | } | ||
585 | |||
586 | INIT_WORK(&ndev->tx_work, nci_tx_work); | ||
587 | snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); | ||
588 | ndev->tx_wq = create_singlethread_workqueue(name); | ||
589 | if (!ndev->tx_wq) { | ||
590 | rc = -ENOMEM; | ||
591 | goto destroy_rx_wq_exit; | ||
592 | } | ||
593 | |||
594 | skb_queue_head_init(&ndev->cmd_q); | ||
595 | skb_queue_head_init(&ndev->rx_q); | ||
596 | skb_queue_head_init(&ndev->tx_q); | ||
597 | |||
598 | setup_timer(&ndev->cmd_timer, nci_cmd_timer, | ||
599 | (unsigned long) ndev); | ||
600 | |||
601 | mutex_init(&ndev->req_lock); | ||
602 | |||
603 | goto exit; | ||
604 | |||
605 | destroy_rx_wq_exit: | ||
606 | destroy_workqueue(ndev->rx_wq); | ||
607 | |||
608 | destroy_cmd_wq_exit: | ||
609 | destroy_workqueue(ndev->cmd_wq); | ||
610 | |||
611 | unreg_exit: | ||
612 | nfc_unregister_device(ndev->nfc_dev); | ||
613 | |||
614 | exit: | ||
615 | return rc; | ||
616 | } | ||
617 | EXPORT_SYMBOL(nci_register_device); | ||
618 | |||
619 | /** | ||
620 | * nci_unregister_device - unregister a nci device in the nfc subsystem | ||
621 | * | ||
622 | * @dev: The nci device to unregister | ||
623 | */ | ||
624 | void nci_unregister_device(struct nci_dev *ndev) | ||
625 | { | ||
626 | nfc_dbg("entry"); | ||
627 | |||
628 | nci_close_device(ndev); | ||
629 | |||
630 | destroy_workqueue(ndev->cmd_wq); | ||
631 | destroy_workqueue(ndev->rx_wq); | ||
632 | destroy_workqueue(ndev->tx_wq); | ||
633 | |||
634 | nfc_unregister_device(ndev->nfc_dev); | ||
635 | } | ||
636 | EXPORT_SYMBOL(nci_unregister_device); | ||
637 | |||
638 | /** | ||
639 | * nci_recv_frame - receive frame from NCI drivers | ||
640 | * | ||
641 | * @skb: The sk_buff to receive | ||
642 | */ | ||
643 | int nci_recv_frame(struct sk_buff *skb) | ||
644 | { | ||
645 | struct nci_dev *ndev = (struct nci_dev *) skb->dev; | ||
646 | |||
647 | nfc_dbg("entry, len %d", skb->len); | ||
648 | |||
649 | if (!ndev || (!test_bit(NCI_UP, &ndev->flags) | ||
650 | && !test_bit(NCI_INIT, &ndev->flags))) { | ||
651 | kfree_skb(skb); | ||
652 | return -ENXIO; | ||
653 | } | ||
654 | |||
655 | /* Queue frame for rx worker thread */ | ||
656 | skb_queue_tail(&ndev->rx_q, skb); | ||
657 | queue_work(ndev->rx_wq, &ndev->rx_work); | ||
658 | |||
659 | return 0; | ||
660 | } | ||
661 | EXPORT_SYMBOL(nci_recv_frame); | ||
662 | |||
663 | static int nci_send_frame(struct sk_buff *skb) | ||
664 | { | ||
665 | struct nci_dev *ndev = (struct nci_dev *) skb->dev; | ||
666 | |||
667 | nfc_dbg("entry, len %d", skb->len); | ||
668 | |||
669 | if (!ndev) { | ||
670 | kfree_skb(skb); | ||
671 | return -ENODEV; | ||
672 | } | ||
673 | |||
674 | /* Get rid of skb owner, prior to sending to the driver. */ | ||
675 | skb_orphan(skb); | ||
676 | |||
677 | return ndev->ops->send(skb); | ||
678 | } | ||
679 | |||
680 | /* Send NCI command */ | ||
681 | int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) | ||
682 | { | ||
683 | struct nci_ctrl_hdr *hdr; | ||
684 | struct sk_buff *skb; | ||
685 | |||
686 | nfc_dbg("entry, opcode 0x%x, plen %d", opcode, plen); | ||
687 | |||
688 | skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); | ||
689 | if (!skb) { | ||
690 | nfc_err("no memory for command"); | ||
691 | return -ENOMEM; | ||
692 | } | ||
693 | |||
694 | hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); | ||
695 | hdr->gid = nci_opcode_gid(opcode); | ||
696 | hdr->oid = nci_opcode_oid(opcode); | ||
697 | hdr->plen = plen; | ||
698 | |||
699 | nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); | ||
700 | nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); | ||
701 | |||
702 | if (plen) | ||
703 | memcpy(skb_put(skb, plen), payload, plen); | ||
704 | |||
705 | skb->dev = (void *) ndev; | ||
706 | |||
707 | skb_queue_tail(&ndev->cmd_q, skb); | ||
708 | queue_work(ndev->cmd_wq, &ndev->cmd_work); | ||
709 | |||
710 | return 0; | ||
711 | } | ||
712 | |||
713 | /* ---- NCI TX Data worker thread ---- */ | ||
714 | |||
715 | static void nci_tx_work(struct work_struct *work) | ||
716 | { | ||
717 | struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); | ||
718 | struct sk_buff *skb; | ||
719 | |||
720 | nfc_dbg("entry, credits_cnt %d", atomic_read(&ndev->credits_cnt)); | ||
721 | |||
722 | /* Send queued tx data */ | ||
723 | while (atomic_read(&ndev->credits_cnt)) { | ||
724 | skb = skb_dequeue(&ndev->tx_q); | ||
725 | if (!skb) | ||
726 | return; | ||
727 | |||
728 | atomic_dec(&ndev->credits_cnt); | ||
729 | |||
730 | nfc_dbg("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d", | ||
731 | nci_pbf(skb->data), | ||
732 | nci_conn_id(skb->data), | ||
733 | nci_plen(skb->data)); | ||
734 | |||
735 | nci_send_frame(skb); | ||
736 | } | ||
737 | } | ||
738 | |||
739 | /* ----- NCI RX worker thread (data & control) ----- */ | ||
740 | |||
741 | static void nci_rx_work(struct work_struct *work) | ||
742 | { | ||
743 | struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); | ||
744 | struct sk_buff *skb; | ||
745 | |||
746 | while ((skb = skb_dequeue(&ndev->rx_q))) { | ||
747 | /* Process frame */ | ||
748 | switch (nci_mt(skb->data)) { | ||
749 | case NCI_MT_RSP_PKT: | ||
750 | nci_rsp_packet(ndev, skb); | ||
751 | break; | ||
752 | |||
753 | case NCI_MT_NTF_PKT: | ||
754 | nci_ntf_packet(ndev, skb); | ||
755 | break; | ||
756 | |||
757 | case NCI_MT_DATA_PKT: | ||
758 | nci_rx_data_packet(ndev, skb); | ||
759 | break; | ||
760 | |||
761 | default: | ||
762 | nfc_err("unknown MT 0x%x", nci_mt(skb->data)); | ||
763 | kfree_skb(skb); | ||
764 | break; | ||
765 | } | ||
766 | } | ||
767 | } | ||
768 | |||
769 | /* ----- NCI TX CMD worker thread ----- */ | ||
770 | |||
771 | static void nci_cmd_work(struct work_struct *work) | ||
772 | { | ||
773 | struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); | ||
774 | struct sk_buff *skb; | ||
775 | |||
776 | nfc_dbg("entry, cmd_cnt %d", atomic_read(&ndev->cmd_cnt)); | ||
777 | |||
778 | /* Send queued command */ | ||
779 | if (atomic_read(&ndev->cmd_cnt)) { | ||
780 | skb = skb_dequeue(&ndev->cmd_q); | ||
781 | if (!skb) | ||
782 | return; | ||
783 | |||
784 | atomic_dec(&ndev->cmd_cnt); | ||
785 | |||
786 | nfc_dbg("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d", | ||
787 | nci_pbf(skb->data), | ||
788 | nci_opcode_gid(nci_opcode(skb->data)), | ||
789 | nci_opcode_oid(nci_opcode(skb->data)), | ||
790 | nci_plen(skb->data)); | ||
791 | |||
792 | nci_send_frame(skb); | ||
793 | |||
794 | mod_timer(&ndev->cmd_timer, | ||
795 | jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); | ||
796 | } | ||
797 | } | ||