Commit | Line | Data |
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6a2968aa IE |
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 | { | |
6a2968aa | 138 | struct nci_core_conn_create_cmd conn_cmd; |
2eb1dc10 IE |
139 | struct nci_rf_disc_map_cmd cmd; |
140 | struct disc_map_config *cfg = cmd.mapping_configs; | |
141 | __u8 *num = &cmd.num_mapping_configs; | |
6a2968aa IE |
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 */ | |
2eb1dc10 | 150 | *num = 0; |
6a2968aa IE |
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) { | |
2eb1dc10 IE |
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)++; | |
6a2968aa IE |
160 | } else if (ndev->supported_rf_interfaces[i] == |
161 | NCI_RF_INTERFACE_NFC_DEP) { | |
2eb1dc10 IE |
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)++; | |
6a2968aa IE |
166 | } |
167 | ||
2eb1dc10 | 168 | if (*num == NCI_MAX_NUM_MAPPING_CONFIGS) |
6a2968aa IE |
169 | break; |
170 | } | |
171 | ||
172 | nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD, | |
2eb1dc10 | 173 | (1 + ((*num)*sizeof(struct disc_map_config))), |
6a2968aa IE |
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 (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) { | |
365 | nfc_dbg("target already active, first deactivate..."); | |
366 | ||
367 | rc = nci_request(ndev, nci_rf_deactivate_req, 0, | |
368 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); | |
369 | if (rc) | |
370 | return -EBUSY; | |
371 | } | |
372 | ||
373 | rc = nci_request(ndev, nci_rf_discover_req, protocols, | |
374 | msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); | |
375 | ||
376 | if (!rc) | |
377 | ndev->poll_prots = protocols; | |
378 | ||
379 | return rc; | |
380 | } | |
381 | ||
382 | static void nci_stop_poll(struct nfc_dev *nfc_dev) | |
383 | { | |
384 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
385 | ||
386 | nfc_dbg("entry"); | |
387 | ||
388 | if (!test_bit(NCI_DISCOVERY, &ndev->flags)) { | |
389 | nfc_err("unable to stop poll, since poll is not active"); | |
390 | return; | |
391 | } | |
392 | ||
393 | nci_request(ndev, nci_rf_deactivate_req, 0, | |
394 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); | |
395 | } | |
396 | ||
397 | static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx, | |
398 | __u32 protocol) | |
399 | { | |
400 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
401 | ||
402 | nfc_dbg("entry, target_idx %d, protocol 0x%x", target_idx, protocol); | |
403 | ||
404 | if (!test_bit(NCI_POLL_ACTIVE, &ndev->flags)) { | |
405 | nfc_err("there is no available target to activate"); | |
406 | return -EINVAL; | |
407 | } | |
408 | ||
409 | if (ndev->target_active_prot) { | |
410 | nfc_err("there is already an active target"); | |
411 | return -EBUSY; | |
412 | } | |
413 | ||
414 | if (!(ndev->target_available_prots & (1 << protocol))) { | |
415 | nfc_err("target does not support the requested protocol 0x%x", | |
416 | protocol); | |
417 | return -EINVAL; | |
418 | } | |
419 | ||
420 | ndev->target_active_prot = protocol; | |
421 | ndev->target_available_prots = 0; | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx) | |
427 | { | |
428 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
429 | ||
430 | nfc_dbg("entry, target_idx %d", target_idx); | |
431 | ||
432 | if (!ndev->target_active_prot) { | |
433 | nfc_err("unable to deactivate target, no active target"); | |
434 | return; | |
435 | } | |
436 | ||
437 | ndev->target_active_prot = 0; | |
438 | ||
439 | if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) { | |
440 | nci_request(ndev, nci_rf_deactivate_req, 0, | |
441 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); | |
442 | } | |
443 | } | |
444 | ||
445 | static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx, | |
446 | struct sk_buff *skb, | |
447 | data_exchange_cb_t cb, | |
448 | void *cb_context) | |
449 | { | |
450 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
451 | ||
452 | nfc_dbg("entry, target_idx %d, len %d", target_idx, skb->len); | |
453 | ||
454 | if (!ndev->target_active_prot) { | |
455 | nfc_err("unable to exchange data, no active target"); | |
456 | return -EINVAL; | |
457 | } | |
458 | ||
459 | /* store cb and context to be used on receiving data */ | |
460 | ndev->data_exchange_cb = cb; | |
461 | ndev->data_exchange_cb_context = cb_context; | |
462 | ||
463 | return nci_send_data(ndev, ndev->conn_id, skb); | |
464 | } | |
465 | ||
466 | static struct nfc_ops nci_nfc_ops = { | |
467 | .dev_up = nci_dev_up, | |
468 | .dev_down = nci_dev_down, | |
469 | .start_poll = nci_start_poll, | |
470 | .stop_poll = nci_stop_poll, | |
471 | .activate_target = nci_activate_target, | |
472 | .deactivate_target = nci_deactivate_target, | |
473 | .data_exchange = nci_data_exchange, | |
474 | }; | |
475 | ||
476 | /* ---- Interface to NCI drivers ---- */ | |
477 | ||
478 | /** | |
479 | * nci_allocate_device - allocate a new nci device | |
480 | * | |
481 | * @ops: device operations | |
482 | * @supported_protocols: NFC protocols supported by the device | |
483 | */ | |
484 | struct nci_dev *nci_allocate_device(struct nci_ops *ops, | |
485 | __u32 supported_protocols, | |
486 | int tx_headroom, | |
487 | int tx_tailroom) | |
488 | { | |
489 | struct nci_dev *ndev = NULL; | |
490 | ||
491 | nfc_dbg("entry, supported_protocols 0x%x", supported_protocols); | |
492 | ||
493 | if (!ops->open || !ops->close || !ops->send) | |
494 | goto exit; | |
495 | ||
496 | if (!supported_protocols) | |
497 | goto exit; | |
498 | ||
499 | ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); | |
500 | if (!ndev) | |
501 | goto exit; | |
502 | ||
503 | ndev->ops = ops; | |
504 | ndev->tx_headroom = tx_headroom; | |
505 | ndev->tx_tailroom = tx_tailroom; | |
506 | ||
507 | ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, | |
508 | supported_protocols, | |
509 | tx_headroom + NCI_DATA_HDR_SIZE, | |
510 | tx_tailroom); | |
511 | if (!ndev->nfc_dev) | |
512 | goto free_exit; | |
513 | ||
514 | nfc_set_drvdata(ndev->nfc_dev, ndev); | |
515 | ||
516 | goto exit; | |
517 | ||
518 | free_exit: | |
519 | kfree(ndev); | |
520 | ||
521 | exit: | |
522 | return ndev; | |
523 | } | |
524 | EXPORT_SYMBOL(nci_allocate_device); | |
525 | ||
526 | /** | |
527 | * nci_free_device - deallocate nci device | |
528 | * | |
529 | * @ndev: The nci device to deallocate | |
530 | */ | |
531 | void nci_free_device(struct nci_dev *ndev) | |
532 | { | |
533 | nfc_dbg("entry"); | |
534 | ||
535 | nfc_free_device(ndev->nfc_dev); | |
536 | kfree(ndev); | |
537 | } | |
538 | EXPORT_SYMBOL(nci_free_device); | |
539 | ||
540 | /** | |
541 | * nci_register_device - register a nci device in the nfc subsystem | |
542 | * | |
543 | * @dev: The nci device to register | |
544 | */ | |
545 | int nci_register_device(struct nci_dev *ndev) | |
546 | { | |
547 | int rc; | |
548 | struct device *dev = &ndev->nfc_dev->dev; | |
549 | char name[32]; | |
550 | ||
551 | nfc_dbg("entry"); | |
552 | ||
553 | rc = nfc_register_device(ndev->nfc_dev); | |
554 | if (rc) | |
555 | goto exit; | |
556 | ||
557 | ndev->flags = 0; | |
558 | ||
559 | INIT_WORK(&ndev->cmd_work, nci_cmd_work); | |
560 | snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); | |
561 | ndev->cmd_wq = create_singlethread_workqueue(name); | |
562 | if (!ndev->cmd_wq) { | |
563 | rc = -ENOMEM; | |
564 | goto unreg_exit; | |
565 | } | |
566 | ||
567 | INIT_WORK(&ndev->rx_work, nci_rx_work); | |
568 | snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); | |
569 | ndev->rx_wq = create_singlethread_workqueue(name); | |
570 | if (!ndev->rx_wq) { | |
571 | rc = -ENOMEM; | |
572 | goto destroy_cmd_wq_exit; | |
573 | } | |
574 | ||
575 | INIT_WORK(&ndev->tx_work, nci_tx_work); | |
576 | snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); | |
577 | ndev->tx_wq = create_singlethread_workqueue(name); | |
578 | if (!ndev->tx_wq) { | |
579 | rc = -ENOMEM; | |
580 | goto destroy_rx_wq_exit; | |
581 | } | |
582 | ||
583 | skb_queue_head_init(&ndev->cmd_q); | |
584 | skb_queue_head_init(&ndev->rx_q); | |
585 | skb_queue_head_init(&ndev->tx_q); | |
586 | ||
587 | setup_timer(&ndev->cmd_timer, nci_cmd_timer, | |
588 | (unsigned long) ndev); | |
589 | ||
590 | mutex_init(&ndev->req_lock); | |
591 | ||
592 | goto exit; | |
593 | ||
594 | destroy_rx_wq_exit: | |
595 | destroy_workqueue(ndev->rx_wq); | |
596 | ||
597 | destroy_cmd_wq_exit: | |
598 | destroy_workqueue(ndev->cmd_wq); | |
599 | ||
600 | unreg_exit: | |
601 | nfc_unregister_device(ndev->nfc_dev); | |
602 | ||
603 | exit: | |
604 | return rc; | |
605 | } | |
606 | EXPORT_SYMBOL(nci_register_device); | |
607 | ||
608 | /** | |
609 | * nci_unregister_device - unregister a nci device in the nfc subsystem | |
610 | * | |
611 | * @dev: The nci device to unregister | |
612 | */ | |
613 | void nci_unregister_device(struct nci_dev *ndev) | |
614 | { | |
615 | nfc_dbg("entry"); | |
616 | ||
617 | nci_close_device(ndev); | |
618 | ||
619 | destroy_workqueue(ndev->cmd_wq); | |
620 | destroy_workqueue(ndev->rx_wq); | |
621 | destroy_workqueue(ndev->tx_wq); | |
622 | ||
623 | nfc_unregister_device(ndev->nfc_dev); | |
624 | } | |
625 | EXPORT_SYMBOL(nci_unregister_device); | |
626 | ||
627 | /** | |
628 | * nci_recv_frame - receive frame from NCI drivers | |
629 | * | |
630 | * @skb: The sk_buff to receive | |
631 | */ | |
632 | int nci_recv_frame(struct sk_buff *skb) | |
633 | { | |
634 | struct nci_dev *ndev = (struct nci_dev *) skb->dev; | |
635 | ||
636 | nfc_dbg("entry, len %d", skb->len); | |
637 | ||
638 | if (!ndev || (!test_bit(NCI_UP, &ndev->flags) | |
639 | && !test_bit(NCI_INIT, &ndev->flags))) { | |
640 | kfree_skb(skb); | |
641 | return -ENXIO; | |
642 | } | |
643 | ||
644 | /* Queue frame for rx worker thread */ | |
645 | skb_queue_tail(&ndev->rx_q, skb); | |
646 | queue_work(ndev->rx_wq, &ndev->rx_work); | |
647 | ||
648 | return 0; | |
649 | } | |
650 | EXPORT_SYMBOL(nci_recv_frame); | |
651 | ||
652 | static int nci_send_frame(struct sk_buff *skb) | |
653 | { | |
654 | struct nci_dev *ndev = (struct nci_dev *) skb->dev; | |
655 | ||
656 | nfc_dbg("entry, len %d", skb->len); | |
657 | ||
658 | if (!ndev) { | |
659 | kfree_skb(skb); | |
660 | return -ENODEV; | |
661 | } | |
662 | ||
663 | /* Get rid of skb owner, prior to sending to the driver. */ | |
664 | skb_orphan(skb); | |
665 | ||
666 | return ndev->ops->send(skb); | |
667 | } | |
668 | ||
669 | /* Send NCI command */ | |
670 | int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) | |
671 | { | |
672 | struct nci_ctrl_hdr *hdr; | |
673 | struct sk_buff *skb; | |
674 | ||
675 | nfc_dbg("entry, opcode 0x%x, plen %d", opcode, plen); | |
676 | ||
677 | skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); | |
678 | if (!skb) { | |
679 | nfc_err("no memory for command"); | |
680 | return -ENOMEM; | |
681 | } | |
682 | ||
683 | hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); | |
684 | hdr->gid = nci_opcode_gid(opcode); | |
685 | hdr->oid = nci_opcode_oid(opcode); | |
686 | hdr->plen = plen; | |
687 | ||
688 | nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); | |
689 | nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); | |
690 | ||
691 | if (plen) | |
692 | memcpy(skb_put(skb, plen), payload, plen); | |
693 | ||
694 | skb->dev = (void *) ndev; | |
695 | ||
696 | skb_queue_tail(&ndev->cmd_q, skb); | |
697 | queue_work(ndev->cmd_wq, &ndev->cmd_work); | |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
702 | /* ---- NCI TX Data worker thread ---- */ | |
703 | ||
704 | static void nci_tx_work(struct work_struct *work) | |
705 | { | |
706 | struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); | |
707 | struct sk_buff *skb; | |
708 | ||
709 | nfc_dbg("entry, credits_cnt %d", atomic_read(&ndev->credits_cnt)); | |
710 | ||
711 | /* Send queued tx data */ | |
712 | while (atomic_read(&ndev->credits_cnt)) { | |
713 | skb = skb_dequeue(&ndev->tx_q); | |
714 | if (!skb) | |
715 | return; | |
716 | ||
717 | atomic_dec(&ndev->credits_cnt); | |
718 | ||
719 | nfc_dbg("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d", | |
720 | nci_pbf(skb->data), | |
721 | nci_conn_id(skb->data), | |
722 | nci_plen(skb->data)); | |
723 | ||
724 | nci_send_frame(skb); | |
725 | } | |
726 | } | |
727 | ||
728 | /* ----- NCI RX worker thread (data & control) ----- */ | |
729 | ||
730 | static void nci_rx_work(struct work_struct *work) | |
731 | { | |
732 | struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); | |
733 | struct sk_buff *skb; | |
734 | ||
735 | while ((skb = skb_dequeue(&ndev->rx_q))) { | |
736 | /* Process frame */ | |
737 | switch (nci_mt(skb->data)) { | |
738 | case NCI_MT_RSP_PKT: | |
739 | nci_rsp_packet(ndev, skb); | |
740 | break; | |
741 | ||
742 | case NCI_MT_NTF_PKT: | |
743 | nci_ntf_packet(ndev, skb); | |
744 | break; | |
745 | ||
746 | case NCI_MT_DATA_PKT: | |
747 | nci_rx_data_packet(ndev, skb); | |
748 | break; | |
749 | ||
750 | default: | |
751 | nfc_err("unknown MT 0x%x", nci_mt(skb->data)); | |
752 | kfree_skb(skb); | |
753 | break; | |
754 | } | |
755 | } | |
756 | } | |
757 | ||
758 | /* ----- NCI TX CMD worker thread ----- */ | |
759 | ||
760 | static void nci_cmd_work(struct work_struct *work) | |
761 | { | |
762 | struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); | |
763 | struct sk_buff *skb; | |
764 | ||
765 | nfc_dbg("entry, cmd_cnt %d", atomic_read(&ndev->cmd_cnt)); | |
766 | ||
767 | /* Send queued command */ | |
768 | if (atomic_read(&ndev->cmd_cnt)) { | |
769 | skb = skb_dequeue(&ndev->cmd_q); | |
770 | if (!skb) | |
771 | return; | |
772 | ||
773 | atomic_dec(&ndev->cmd_cnt); | |
774 | ||
775 | nfc_dbg("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d", | |
776 | nci_pbf(skb->data), | |
777 | nci_opcode_gid(nci_opcode(skb->data)), | |
778 | nci_opcode_oid(nci_opcode(skb->data)), | |
779 | nci_plen(skb->data)); | |
780 | ||
781 | nci_send_frame(skb); | |
782 | ||
783 | mod_timer(&ndev->cmd_timer, | |
784 | jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); | |
785 | } | |
786 | } |