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 | ||
52858b51 | 28 | #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
ed1e0ad8 | 29 | |
6a2968aa IE |
30 | #include <linux/types.h> |
31 | #include <linux/workqueue.h> | |
32 | #include <linux/completion.h> | |
bc3b2d7f | 33 | #include <linux/export.h> |
6a2968aa IE |
34 | #include <linux/sched.h> |
35 | #include <linux/bitops.h> | |
36 | #include <linux/skbuff.h> | |
37 | ||
38 | #include "../nfc.h" | |
39 | #include <net/nfc/nci.h> | |
40 | #include <net/nfc/nci_core.h> | |
41 | #include <linux/nfc.h> | |
42 | ||
43 | static void nci_cmd_work(struct work_struct *work); | |
44 | static void nci_rx_work(struct work_struct *work); | |
45 | static void nci_tx_work(struct work_struct *work); | |
46 | ||
47 | /* ---- NCI requests ---- */ | |
48 | ||
49 | void nci_req_complete(struct nci_dev *ndev, int result) | |
50 | { | |
51 | if (ndev->req_status == NCI_REQ_PEND) { | |
52 | ndev->req_result = result; | |
53 | ndev->req_status = NCI_REQ_DONE; | |
54 | complete(&ndev->req_completion); | |
55 | } | |
56 | } | |
57 | ||
58 | static void nci_req_cancel(struct nci_dev *ndev, int err) | |
59 | { | |
60 | if (ndev->req_status == NCI_REQ_PEND) { | |
61 | ndev->req_result = err; | |
62 | ndev->req_status = NCI_REQ_CANCELED; | |
63 | complete(&ndev->req_completion); | |
64 | } | |
65 | } | |
66 | ||
67 | /* Execute request and wait for completion. */ | |
68 | static int __nci_request(struct nci_dev *ndev, | |
69 | void (*req)(struct nci_dev *ndev, unsigned long opt), | |
70 | unsigned long opt, | |
71 | __u32 timeout) | |
72 | { | |
73 | int rc = 0; | |
f8c141c3 | 74 | long completion_rc; |
6a2968aa IE |
75 | |
76 | ndev->req_status = NCI_REQ_PEND; | |
77 | ||
78 | init_completion(&ndev->req_completion); | |
79 | req(ndev, opt); | |
80 | completion_rc = wait_for_completion_interruptible_timeout( | |
81 | &ndev->req_completion, | |
82 | timeout); | |
83 | ||
20c239c1 | 84 | pr_debug("wait_for_completion return %ld\n", completion_rc); |
6a2968aa IE |
85 | |
86 | if (completion_rc > 0) { | |
87 | switch (ndev->req_status) { | |
88 | case NCI_REQ_DONE: | |
89 | rc = nci_to_errno(ndev->req_result); | |
90 | break; | |
91 | ||
92 | case NCI_REQ_CANCELED: | |
93 | rc = -ndev->req_result; | |
94 | break; | |
95 | ||
96 | default: | |
97 | rc = -ETIMEDOUT; | |
98 | break; | |
99 | } | |
100 | } else { | |
ed1e0ad8 JP |
101 | pr_err("wait_for_completion_interruptible_timeout failed %ld\n", |
102 | completion_rc); | |
6a2968aa IE |
103 | |
104 | rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc)); | |
105 | } | |
106 | ||
107 | ndev->req_status = ndev->req_result = 0; | |
108 | ||
109 | return rc; | |
110 | } | |
111 | ||
112 | static inline int nci_request(struct nci_dev *ndev, | |
113 | void (*req)(struct nci_dev *ndev, unsigned long opt), | |
114 | unsigned long opt, __u32 timeout) | |
115 | { | |
116 | int rc; | |
117 | ||
118 | if (!test_bit(NCI_UP, &ndev->flags)) | |
119 | return -ENETDOWN; | |
120 | ||
121 | /* Serialize all requests */ | |
122 | mutex_lock(&ndev->req_lock); | |
123 | rc = __nci_request(ndev, req, opt, timeout); | |
124 | mutex_unlock(&ndev->req_lock); | |
125 | ||
126 | return rc; | |
127 | } | |
128 | ||
129 | static void nci_reset_req(struct nci_dev *ndev, unsigned long opt) | |
130 | { | |
e8c0dacd IE |
131 | struct nci_core_reset_cmd cmd; |
132 | ||
133 | cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG; | |
134 | nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd); | |
6a2968aa IE |
135 | } |
136 | ||
137 | static void nci_init_req(struct nci_dev *ndev, unsigned long opt) | |
138 | { | |
139 | nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL); | |
140 | } | |
141 | ||
142 | static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt) | |
143 | { | |
2eb1dc10 IE |
144 | struct nci_rf_disc_map_cmd cmd; |
145 | struct disc_map_config *cfg = cmd.mapping_configs; | |
146 | __u8 *num = &cmd.num_mapping_configs; | |
6a2968aa IE |
147 | int i; |
148 | ||
6a2968aa | 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 | 156 | cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; |
637d85a7 IE |
157 | cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | |
158 | NCI_DISC_MAP_MODE_LISTEN; | |
159 | cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP; | |
2eb1dc10 | 160 | (*num)++; |
6a2968aa IE |
161 | } else if (ndev->supported_rf_interfaces[i] == |
162 | NCI_RF_INTERFACE_NFC_DEP) { | |
2eb1dc10 | 163 | cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; |
637d85a7 IE |
164 | cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | |
165 | NCI_DISC_MAP_MODE_LISTEN; | |
166 | cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP; | |
2eb1dc10 | 167 | (*num)++; |
6a2968aa IE |
168 | } |
169 | ||
2eb1dc10 | 170 | if (*num == NCI_MAX_NUM_MAPPING_CONFIGS) |
6a2968aa IE |
171 | break; |
172 | } | |
173 | ||
174 | nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD, | |
2eb1dc10 | 175 | (1 + ((*num)*sizeof(struct disc_map_config))), |
6a2968aa IE |
176 | &cmd); |
177 | } | |
178 | ||
179 | static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) | |
180 | { | |
181 | struct nci_rf_disc_cmd cmd; | |
182 | __u32 protocols = opt; | |
183 | ||
184 | cmd.num_disc_configs = 0; | |
185 | ||
186 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | |
187 | (protocols & NFC_PROTO_JEWEL_MASK | |
188 | || protocols & NFC_PROTO_MIFARE_MASK | |
189 | || protocols & NFC_PROTO_ISO14443_MASK | |
190 | || protocols & NFC_PROTO_NFC_DEP_MASK)) { | |
637d85a7 IE |
191 | cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
192 | NCI_NFC_A_PASSIVE_POLL_MODE; | |
6a2968aa IE |
193 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
194 | cmd.num_disc_configs++; | |
195 | } | |
196 | ||
197 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | |
198 | (protocols & NFC_PROTO_ISO14443_MASK)) { | |
637d85a7 IE |
199 | cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
200 | NCI_NFC_B_PASSIVE_POLL_MODE; | |
6a2968aa IE |
201 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
202 | cmd.num_disc_configs++; | |
203 | } | |
204 | ||
205 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | |
206 | (protocols & NFC_PROTO_FELICA_MASK | |
207 | || protocols & NFC_PROTO_NFC_DEP_MASK)) { | |
637d85a7 IE |
208 | cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
209 | NCI_NFC_F_PASSIVE_POLL_MODE; | |
6a2968aa IE |
210 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
211 | cmd.num_disc_configs++; | |
212 | } | |
213 | ||
214 | nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, | |
215 | (1 + (cmd.num_disc_configs*sizeof(struct disc_config))), | |
216 | &cmd); | |
217 | } | |
218 | ||
219 | static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) | |
220 | { | |
221 | struct nci_rf_deactivate_cmd cmd; | |
222 | ||
223 | cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE; | |
224 | ||
225 | nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, | |
226 | sizeof(struct nci_rf_deactivate_cmd), | |
227 | &cmd); | |
228 | } | |
229 | ||
230 | static int nci_open_device(struct nci_dev *ndev) | |
231 | { | |
232 | int rc = 0; | |
233 | ||
234 | mutex_lock(&ndev->req_lock); | |
235 | ||
236 | if (test_bit(NCI_UP, &ndev->flags)) { | |
237 | rc = -EALREADY; | |
238 | goto done; | |
239 | } | |
240 | ||
241 | if (ndev->ops->open(ndev)) { | |
242 | rc = -EIO; | |
243 | goto done; | |
244 | } | |
245 | ||
246 | atomic_set(&ndev->cmd_cnt, 1); | |
247 | ||
248 | set_bit(NCI_INIT, &ndev->flags); | |
249 | ||
250 | rc = __nci_request(ndev, nci_reset_req, 0, | |
251 | msecs_to_jiffies(NCI_RESET_TIMEOUT)); | |
252 | ||
253 | if (!rc) { | |
254 | rc = __nci_request(ndev, nci_init_req, 0, | |
255 | msecs_to_jiffies(NCI_INIT_TIMEOUT)); | |
256 | } | |
257 | ||
258 | if (!rc) { | |
259 | rc = __nci_request(ndev, nci_init_complete_req, 0, | |
260 | msecs_to_jiffies(NCI_INIT_TIMEOUT)); | |
261 | } | |
262 | ||
263 | clear_bit(NCI_INIT, &ndev->flags); | |
264 | ||
265 | if (!rc) { | |
266 | set_bit(NCI_UP, &ndev->flags); | |
8939e47f | 267 | atomic_set(&ndev->state, NCI_IDLE); |
6a2968aa IE |
268 | } else { |
269 | /* Init failed, cleanup */ | |
270 | skb_queue_purge(&ndev->cmd_q); | |
271 | skb_queue_purge(&ndev->rx_q); | |
272 | skb_queue_purge(&ndev->tx_q); | |
273 | ||
274 | ndev->ops->close(ndev); | |
275 | ndev->flags = 0; | |
276 | } | |
277 | ||
278 | done: | |
279 | mutex_unlock(&ndev->req_lock); | |
280 | return rc; | |
281 | } | |
282 | ||
283 | static int nci_close_device(struct nci_dev *ndev) | |
284 | { | |
285 | nci_req_cancel(ndev, ENODEV); | |
286 | mutex_lock(&ndev->req_lock); | |
287 | ||
288 | if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { | |
289 | del_timer_sync(&ndev->cmd_timer); | |
c4bf98b2 | 290 | del_timer_sync(&ndev->data_timer); |
6a2968aa IE |
291 | mutex_unlock(&ndev->req_lock); |
292 | return 0; | |
293 | } | |
294 | ||
295 | /* Drop RX and TX queues */ | |
296 | skb_queue_purge(&ndev->rx_q); | |
297 | skb_queue_purge(&ndev->tx_q); | |
298 | ||
299 | /* Flush RX and TX wq */ | |
300 | flush_workqueue(ndev->rx_wq); | |
301 | flush_workqueue(ndev->tx_wq); | |
302 | ||
303 | /* Reset device */ | |
304 | skb_queue_purge(&ndev->cmd_q); | |
305 | atomic_set(&ndev->cmd_cnt, 1); | |
306 | ||
307 | set_bit(NCI_INIT, &ndev->flags); | |
308 | __nci_request(ndev, nci_reset_req, 0, | |
309 | msecs_to_jiffies(NCI_RESET_TIMEOUT)); | |
310 | clear_bit(NCI_INIT, &ndev->flags); | |
311 | ||
312 | /* Flush cmd wq */ | |
313 | flush_workqueue(ndev->cmd_wq); | |
314 | ||
315 | /* After this point our queues are empty | |
316 | * and no works are scheduled. */ | |
317 | ndev->ops->close(ndev); | |
318 | ||
319 | /* Clear flags */ | |
320 | ndev->flags = 0; | |
321 | ||
322 | mutex_unlock(&ndev->req_lock); | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | /* NCI command timer function */ | |
328 | static void nci_cmd_timer(unsigned long arg) | |
329 | { | |
330 | struct nci_dev *ndev = (void *) arg; | |
331 | ||
6a2968aa IE |
332 | atomic_set(&ndev->cmd_cnt, 1); |
333 | queue_work(ndev->cmd_wq, &ndev->cmd_work); | |
334 | } | |
335 | ||
c4bf98b2 IE |
336 | /* NCI data exchange timer function */ |
337 | static void nci_data_timer(unsigned long arg) | |
338 | { | |
339 | struct nci_dev *ndev = (void *) arg; | |
340 | ||
341 | set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); | |
342 | queue_work(ndev->rx_wq, &ndev->rx_work); | |
343 | } | |
344 | ||
6a2968aa IE |
345 | static int nci_dev_up(struct nfc_dev *nfc_dev) |
346 | { | |
347 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
348 | ||
6a2968aa IE |
349 | return nci_open_device(ndev); |
350 | } | |
351 | ||
352 | static int nci_dev_down(struct nfc_dev *nfc_dev) | |
353 | { | |
354 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
355 | ||
6a2968aa IE |
356 | return nci_close_device(ndev); |
357 | } | |
358 | ||
359 | static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols) | |
360 | { | |
361 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
362 | int rc; | |
363 | ||
8939e47f | 364 | if (atomic_read(&ndev->state) == NCI_DISCOVERY) { |
ed1e0ad8 | 365 | pr_err("unable to start poll, since poll is already active\n"); |
6a2968aa IE |
366 | return -EBUSY; |
367 | } | |
368 | ||
de054799 | 369 | if (ndev->target_active_prot) { |
ed1e0ad8 | 370 | pr_err("there is an active target\n"); |
de054799 IE |
371 | return -EBUSY; |
372 | } | |
373 | ||
8939e47f | 374 | if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { |
20c239c1 | 375 | pr_debug("target is active, implicitly deactivate...\n"); |
6a2968aa IE |
376 | |
377 | rc = nci_request(ndev, nci_rf_deactivate_req, 0, | |
378 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); | |
379 | if (rc) | |
380 | return -EBUSY; | |
381 | } | |
382 | ||
383 | rc = nci_request(ndev, nci_rf_discover_req, protocols, | |
384 | msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); | |
385 | ||
386 | if (!rc) | |
387 | ndev->poll_prots = protocols; | |
388 | ||
389 | return rc; | |
390 | } | |
391 | ||
392 | static void nci_stop_poll(struct nfc_dev *nfc_dev) | |
393 | { | |
394 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
395 | ||
8939e47f | 396 | if (atomic_read(&ndev->state) != NCI_DISCOVERY) { |
ed1e0ad8 | 397 | pr_err("unable to stop poll, since poll is not active\n"); |
6a2968aa IE |
398 | return; |
399 | } | |
400 | ||
401 | nci_request(ndev, nci_rf_deactivate_req, 0, | |
402 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); | |
403 | } | |
404 | ||
405 | static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx, | |
406 | __u32 protocol) | |
407 | { | |
408 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
409 | ||
24bf3304 | 410 | pr_debug("target_idx %d, protocol 0x%x\n", target_idx, protocol); |
6a2968aa | 411 | |
8939e47f | 412 | if (atomic_read(&ndev->state) != NCI_POLL_ACTIVE) { |
ed1e0ad8 | 413 | pr_err("there is no available target to activate\n"); |
6a2968aa IE |
414 | return -EINVAL; |
415 | } | |
416 | ||
417 | if (ndev->target_active_prot) { | |
ed1e0ad8 | 418 | pr_err("there is already an active target\n"); |
6a2968aa IE |
419 | return -EBUSY; |
420 | } | |
421 | ||
422 | if (!(ndev->target_available_prots & (1 << protocol))) { | |
ed1e0ad8 JP |
423 | pr_err("target does not support the requested protocol 0x%x\n", |
424 | protocol); | |
6a2968aa IE |
425 | return -EINVAL; |
426 | } | |
427 | ||
428 | ndev->target_active_prot = protocol; | |
429 | ndev->target_available_prots = 0; | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx) | |
435 | { | |
436 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
437 | ||
24bf3304 | 438 | pr_debug("target_idx %d\n", target_idx); |
6a2968aa IE |
439 | |
440 | if (!ndev->target_active_prot) { | |
ed1e0ad8 | 441 | pr_err("unable to deactivate target, no active target\n"); |
6a2968aa IE |
442 | return; |
443 | } | |
444 | ||
445 | ndev->target_active_prot = 0; | |
446 | ||
8939e47f | 447 | if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { |
6a2968aa IE |
448 | nci_request(ndev, nci_rf_deactivate_req, 0, |
449 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); | |
450 | } | |
451 | } | |
452 | ||
453 | static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx, | |
454 | struct sk_buff *skb, | |
455 | data_exchange_cb_t cb, | |
456 | void *cb_context) | |
457 | { | |
458 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
38f04c6b | 459 | int rc; |
6a2968aa | 460 | |
24bf3304 | 461 | pr_debug("target_idx %d, len %d\n", target_idx, skb->len); |
6a2968aa IE |
462 | |
463 | if (!ndev->target_active_prot) { | |
ed1e0ad8 | 464 | pr_err("unable to exchange data, no active target\n"); |
6a2968aa IE |
465 | return -EINVAL; |
466 | } | |
467 | ||
38f04c6b IE |
468 | if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) |
469 | return -EBUSY; | |
470 | ||
6a2968aa IE |
471 | /* store cb and context to be used on receiving data */ |
472 | ndev->data_exchange_cb = cb; | |
473 | ndev->data_exchange_cb_context = cb_context; | |
474 | ||
e8c0dacd | 475 | rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); |
38f04c6b IE |
476 | if (rc) |
477 | clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); | |
478 | ||
479 | return rc; | |
6a2968aa IE |
480 | } |
481 | ||
482 | static struct nfc_ops nci_nfc_ops = { | |
483 | .dev_up = nci_dev_up, | |
484 | .dev_down = nci_dev_down, | |
485 | .start_poll = nci_start_poll, | |
486 | .stop_poll = nci_stop_poll, | |
487 | .activate_target = nci_activate_target, | |
488 | .deactivate_target = nci_deactivate_target, | |
489 | .data_exchange = nci_data_exchange, | |
490 | }; | |
491 | ||
492 | /* ---- Interface to NCI drivers ---- */ | |
493 | ||
494 | /** | |
495 | * nci_allocate_device - allocate a new nci device | |
496 | * | |
497 | * @ops: device operations | |
498 | * @supported_protocols: NFC protocols supported by the device | |
499 | */ | |
500 | struct nci_dev *nci_allocate_device(struct nci_ops *ops, | |
501 | __u32 supported_protocols, | |
502 | int tx_headroom, | |
503 | int tx_tailroom) | |
504 | { | |
8ebafde0 | 505 | struct nci_dev *ndev; |
6a2968aa | 506 | |
24bf3304 | 507 | pr_debug("supported_protocols 0x%x\n", supported_protocols); |
6a2968aa IE |
508 | |
509 | if (!ops->open || !ops->close || !ops->send) | |
8ebafde0 | 510 | return NULL; |
6a2968aa IE |
511 | |
512 | if (!supported_protocols) | |
8ebafde0 | 513 | return NULL; |
6a2968aa IE |
514 | |
515 | ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); | |
516 | if (!ndev) | |
8ebafde0 | 517 | return NULL; |
6a2968aa IE |
518 | |
519 | ndev->ops = ops; | |
520 | ndev->tx_headroom = tx_headroom; | |
521 | ndev->tx_tailroom = tx_tailroom; | |
522 | ||
523 | ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, | |
524 | supported_protocols, | |
525 | tx_headroom + NCI_DATA_HDR_SIZE, | |
526 | tx_tailroom); | |
527 | if (!ndev->nfc_dev) | |
528 | goto free_exit; | |
529 | ||
530 | nfc_set_drvdata(ndev->nfc_dev, ndev); | |
531 | ||
8ebafde0 | 532 | return ndev; |
6a2968aa IE |
533 | |
534 | free_exit: | |
535 | kfree(ndev); | |
8ebafde0 | 536 | return NULL; |
6a2968aa IE |
537 | } |
538 | EXPORT_SYMBOL(nci_allocate_device); | |
539 | ||
540 | /** | |
541 | * nci_free_device - deallocate nci device | |
542 | * | |
543 | * @ndev: The nci device to deallocate | |
544 | */ | |
545 | void nci_free_device(struct nci_dev *ndev) | |
546 | { | |
6a2968aa IE |
547 | nfc_free_device(ndev->nfc_dev); |
548 | kfree(ndev); | |
549 | } | |
550 | EXPORT_SYMBOL(nci_free_device); | |
551 | ||
552 | /** | |
553 | * nci_register_device - register a nci device in the nfc subsystem | |
554 | * | |
555 | * @dev: The nci device to register | |
556 | */ | |
557 | int nci_register_device(struct nci_dev *ndev) | |
558 | { | |
559 | int rc; | |
560 | struct device *dev = &ndev->nfc_dev->dev; | |
561 | char name[32]; | |
562 | ||
6a2968aa IE |
563 | rc = nfc_register_device(ndev->nfc_dev); |
564 | if (rc) | |
565 | goto exit; | |
566 | ||
567 | ndev->flags = 0; | |
568 | ||
569 | INIT_WORK(&ndev->cmd_work, nci_cmd_work); | |
570 | snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); | |
571 | ndev->cmd_wq = create_singlethread_workqueue(name); | |
572 | if (!ndev->cmd_wq) { | |
573 | rc = -ENOMEM; | |
574 | goto unreg_exit; | |
575 | } | |
576 | ||
577 | INIT_WORK(&ndev->rx_work, nci_rx_work); | |
578 | snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); | |
579 | ndev->rx_wq = create_singlethread_workqueue(name); | |
580 | if (!ndev->rx_wq) { | |
581 | rc = -ENOMEM; | |
582 | goto destroy_cmd_wq_exit; | |
583 | } | |
584 | ||
585 | INIT_WORK(&ndev->tx_work, nci_tx_work); | |
586 | snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); | |
587 | ndev->tx_wq = create_singlethread_workqueue(name); | |
588 | if (!ndev->tx_wq) { | |
589 | rc = -ENOMEM; | |
590 | goto destroy_rx_wq_exit; | |
591 | } | |
592 | ||
593 | skb_queue_head_init(&ndev->cmd_q); | |
594 | skb_queue_head_init(&ndev->rx_q); | |
595 | skb_queue_head_init(&ndev->tx_q); | |
596 | ||
597 | setup_timer(&ndev->cmd_timer, nci_cmd_timer, | |
598 | (unsigned long) ndev); | |
c4bf98b2 IE |
599 | setup_timer(&ndev->data_timer, nci_data_timer, |
600 | (unsigned long) ndev); | |
6a2968aa IE |
601 | |
602 | mutex_init(&ndev->req_lock); | |
603 | ||
604 | goto exit; | |
605 | ||
606 | destroy_rx_wq_exit: | |
607 | destroy_workqueue(ndev->rx_wq); | |
608 | ||
609 | destroy_cmd_wq_exit: | |
610 | destroy_workqueue(ndev->cmd_wq); | |
611 | ||
612 | unreg_exit: | |
613 | nfc_unregister_device(ndev->nfc_dev); | |
614 | ||
615 | exit: | |
616 | return rc; | |
617 | } | |
618 | EXPORT_SYMBOL(nci_register_device); | |
619 | ||
620 | /** | |
621 | * nci_unregister_device - unregister a nci device in the nfc subsystem | |
622 | * | |
623 | * @dev: The nci device to unregister | |
624 | */ | |
625 | void nci_unregister_device(struct nci_dev *ndev) | |
626 | { | |
6a2968aa IE |
627 | nci_close_device(ndev); |
628 | ||
629 | destroy_workqueue(ndev->cmd_wq); | |
630 | destroy_workqueue(ndev->rx_wq); | |
631 | destroy_workqueue(ndev->tx_wq); | |
632 | ||
633 | nfc_unregister_device(ndev->nfc_dev); | |
634 | } | |
635 | EXPORT_SYMBOL(nci_unregister_device); | |
636 | ||
637 | /** | |
638 | * nci_recv_frame - receive frame from NCI drivers | |
639 | * | |
640 | * @skb: The sk_buff to receive | |
641 | */ | |
642 | int nci_recv_frame(struct sk_buff *skb) | |
643 | { | |
644 | struct nci_dev *ndev = (struct nci_dev *) skb->dev; | |
645 | ||
24bf3304 | 646 | pr_debug("len %d\n", skb->len); |
6a2968aa IE |
647 | |
648 | if (!ndev || (!test_bit(NCI_UP, &ndev->flags) | |
649 | && !test_bit(NCI_INIT, &ndev->flags))) { | |
650 | kfree_skb(skb); | |
651 | return -ENXIO; | |
652 | } | |
653 | ||
654 | /* Queue frame for rx worker thread */ | |
655 | skb_queue_tail(&ndev->rx_q, skb); | |
656 | queue_work(ndev->rx_wq, &ndev->rx_work); | |
657 | ||
658 | return 0; | |
659 | } | |
660 | EXPORT_SYMBOL(nci_recv_frame); | |
661 | ||
662 | static int nci_send_frame(struct sk_buff *skb) | |
663 | { | |
664 | struct nci_dev *ndev = (struct nci_dev *) skb->dev; | |
665 | ||
24bf3304 | 666 | pr_debug("len %d\n", skb->len); |
6a2968aa IE |
667 | |
668 | if (!ndev) { | |
669 | kfree_skb(skb); | |
670 | return -ENODEV; | |
671 | } | |
672 | ||
673 | /* Get rid of skb owner, prior to sending to the driver. */ | |
674 | skb_orphan(skb); | |
675 | ||
676 | return ndev->ops->send(skb); | |
677 | } | |
678 | ||
679 | /* Send NCI command */ | |
680 | int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) | |
681 | { | |
682 | struct nci_ctrl_hdr *hdr; | |
683 | struct sk_buff *skb; | |
684 | ||
24bf3304 | 685 | pr_debug("opcode 0x%x, plen %d\n", opcode, plen); |
6a2968aa IE |
686 | |
687 | skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); | |
688 | if (!skb) { | |
ed1e0ad8 | 689 | pr_err("no memory for command\n"); |
6a2968aa IE |
690 | return -ENOMEM; |
691 | } | |
692 | ||
693 | hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); | |
694 | hdr->gid = nci_opcode_gid(opcode); | |
695 | hdr->oid = nci_opcode_oid(opcode); | |
696 | hdr->plen = plen; | |
697 | ||
698 | nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); | |
699 | nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); | |
700 | ||
701 | if (plen) | |
702 | memcpy(skb_put(skb, plen), payload, plen); | |
703 | ||
704 | skb->dev = (void *) ndev; | |
705 | ||
706 | skb_queue_tail(&ndev->cmd_q, skb); | |
707 | queue_work(ndev->cmd_wq, &ndev->cmd_work); | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
712 | /* ---- NCI TX Data worker thread ---- */ | |
713 | ||
714 | static void nci_tx_work(struct work_struct *work) | |
715 | { | |
716 | struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); | |
717 | struct sk_buff *skb; | |
718 | ||
24bf3304 | 719 | pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt)); |
6a2968aa IE |
720 | |
721 | /* Send queued tx data */ | |
722 | while (atomic_read(&ndev->credits_cnt)) { | |
723 | skb = skb_dequeue(&ndev->tx_q); | |
724 | if (!skb) | |
725 | return; | |
726 | ||
db98c829 IE |
727 | /* Check if data flow control is used */ |
728 | if (atomic_read(&ndev->credits_cnt) != | |
729 | NCI_DATA_FLOW_CONTROL_NOT_USED) | |
730 | atomic_dec(&ndev->credits_cnt); | |
6a2968aa | 731 | |
20c239c1 JP |
732 | pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", |
733 | nci_pbf(skb->data), | |
734 | nci_conn_id(skb->data), | |
735 | nci_plen(skb->data)); | |
6a2968aa IE |
736 | |
737 | nci_send_frame(skb); | |
c4bf98b2 IE |
738 | |
739 | mod_timer(&ndev->data_timer, | |
740 | jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); | |
6a2968aa IE |
741 | } |
742 | } | |
743 | ||
744 | /* ----- NCI RX worker thread (data & control) ----- */ | |
745 | ||
746 | static void nci_rx_work(struct work_struct *work) | |
747 | { | |
748 | struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); | |
749 | struct sk_buff *skb; | |
750 | ||
751 | while ((skb = skb_dequeue(&ndev->rx_q))) { | |
752 | /* Process frame */ | |
753 | switch (nci_mt(skb->data)) { | |
754 | case NCI_MT_RSP_PKT: | |
755 | nci_rsp_packet(ndev, skb); | |
756 | break; | |
757 | ||
758 | case NCI_MT_NTF_PKT: | |
759 | nci_ntf_packet(ndev, skb); | |
760 | break; | |
761 | ||
762 | case NCI_MT_DATA_PKT: | |
763 | nci_rx_data_packet(ndev, skb); | |
764 | break; | |
765 | ||
766 | default: | |
ed1e0ad8 | 767 | pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); |
6a2968aa IE |
768 | kfree_skb(skb); |
769 | break; | |
770 | } | |
771 | } | |
c4bf98b2 IE |
772 | |
773 | /* check if a data exchange timout has occurred */ | |
774 | if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { | |
775 | /* complete the data exchange transaction, if exists */ | |
776 | if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) | |
777 | nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT); | |
778 | ||
779 | clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); | |
780 | } | |
6a2968aa IE |
781 | } |
782 | ||
783 | /* ----- NCI TX CMD worker thread ----- */ | |
784 | ||
785 | static void nci_cmd_work(struct work_struct *work) | |
786 | { | |
787 | struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); | |
788 | struct sk_buff *skb; | |
789 | ||
24bf3304 | 790 | pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); |
6a2968aa IE |
791 | |
792 | /* Send queued command */ | |
793 | if (atomic_read(&ndev->cmd_cnt)) { | |
794 | skb = skb_dequeue(&ndev->cmd_q); | |
795 | if (!skb) | |
796 | return; | |
797 | ||
798 | atomic_dec(&ndev->cmd_cnt); | |
799 | ||
20c239c1 JP |
800 | pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", |
801 | nci_pbf(skb->data), | |
802 | nci_opcode_gid(nci_opcode(skb->data)), | |
803 | nci_opcode_oid(nci_opcode(skb->data)), | |
804 | nci_plen(skb->data)); | |
6a2968aa IE |
805 | |
806 | nci_send_frame(skb); | |
807 | ||
808 | mod_timer(&ndev->cmd_timer, | |
809 | jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); | |
810 | } | |
811 | } |