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 | ||
de054799 IE |
364 | if (ndev->target_active_prot) { |
365 | nfc_err("there is an active target"); | |
366 | return -EBUSY; | |
367 | } | |
368 | ||
6a2968aa | 369 | if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) { |
de054799 | 370 | nfc_dbg("target is active, implicitly deactivate..."); |
6a2968aa IE |
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); | |
38f04c6b | 456 | int rc; |
6a2968aa IE |
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 | ||
38f04c6b IE |
465 | if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) |
466 | return -EBUSY; | |
467 | ||
6a2968aa IE |
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 | ||
38f04c6b IE |
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; | |
6a2968aa IE |
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 | { | |
8ebafde0 | 502 | struct nci_dev *ndev; |
6a2968aa IE |
503 | |
504 | nfc_dbg("entry, supported_protocols 0x%x", supported_protocols); | |
505 | ||
506 | if (!ops->open || !ops->close || !ops->send) | |
8ebafde0 | 507 | return NULL; |
6a2968aa IE |
508 | |
509 | if (!supported_protocols) | |
8ebafde0 | 510 | return NULL; |
6a2968aa IE |
511 | |
512 | ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); | |
513 | if (!ndev) | |
8ebafde0 | 514 | return NULL; |
6a2968aa IE |
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 | ||
8ebafde0 | 529 | return ndev; |
6a2968aa IE |
530 | |
531 | free_exit: | |
532 | kfree(ndev); | |
8ebafde0 | 533 | return NULL; |
6a2968aa IE |
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 | } |