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, | |
eb9bc6e9 SO |
69 | void (*req)(struct nci_dev *ndev, unsigned long opt), |
70 | unsigned long opt, __u32 timeout) | |
6a2968aa IE |
71 | { |
72 | int rc = 0; | |
f8c141c3 | 73 | long completion_rc; |
6a2968aa IE |
74 | |
75 | ndev->req_status = NCI_REQ_PEND; | |
76 | ||
77 | init_completion(&ndev->req_completion); | |
78 | req(ndev, opt); | |
eb9bc6e9 SO |
79 | completion_rc = |
80 | wait_for_completion_interruptible_timeout(&ndev->req_completion, | |
81 | timeout); | |
6a2968aa | 82 | |
20c239c1 | 83 | pr_debug("wait_for_completion return %ld\n", completion_rc); |
6a2968aa IE |
84 | |
85 | if (completion_rc > 0) { | |
86 | switch (ndev->req_status) { | |
87 | case NCI_REQ_DONE: | |
88 | rc = nci_to_errno(ndev->req_result); | |
89 | break; | |
90 | ||
91 | case NCI_REQ_CANCELED: | |
92 | rc = -ndev->req_result; | |
93 | break; | |
94 | ||
95 | default: | |
96 | rc = -ETIMEDOUT; | |
97 | break; | |
98 | } | |
99 | } else { | |
ed1e0ad8 JP |
100 | pr_err("wait_for_completion_interruptible_timeout failed %ld\n", |
101 | completion_rc); | |
6a2968aa IE |
102 | |
103 | rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc)); | |
104 | } | |
105 | ||
106 | ndev->req_status = ndev->req_result = 0; | |
107 | ||
108 | return rc; | |
109 | } | |
110 | ||
111 | static inline int nci_request(struct nci_dev *ndev, | |
eb9bc6e9 SO |
112 | void (*req)(struct nci_dev *ndev, |
113 | unsigned long opt), | |
114 | unsigned long opt, __u32 timeout) | |
6a2968aa IE |
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] == | |
eb9bc6e9 | 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 | 161 | } else if (ndev->supported_rf_interfaces[i] == |
eb9bc6e9 | 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, | |
eb9bc6e9 | 175 | (1 + ((*num) * sizeof(struct disc_map_config))), &cmd); |
6a2968aa IE |
176 | } |
177 | ||
178 | static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) | |
179 | { | |
180 | struct nci_rf_disc_cmd cmd; | |
181 | __u32 protocols = opt; | |
182 | ||
183 | cmd.num_disc_configs = 0; | |
184 | ||
185 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | |
eb9bc6e9 SO |
186 | (protocols & NFC_PROTO_JEWEL_MASK |
187 | || protocols & NFC_PROTO_MIFARE_MASK | |
188 | || protocols & NFC_PROTO_ISO14443_MASK | |
189 | || protocols & NFC_PROTO_NFC_DEP_MASK)) { | |
637d85a7 | 190 | cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
eb9bc6e9 | 191 | NCI_NFC_A_PASSIVE_POLL_MODE; |
6a2968aa IE |
192 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
193 | cmd.num_disc_configs++; | |
194 | } | |
195 | ||
196 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | |
eb9bc6e9 | 197 | (protocols & NFC_PROTO_ISO14443_MASK)) { |
637d85a7 | 198 | cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
eb9bc6e9 | 199 | NCI_NFC_B_PASSIVE_POLL_MODE; |
6a2968aa IE |
200 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
201 | cmd.num_disc_configs++; | |
202 | } | |
203 | ||
204 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | |
eb9bc6e9 SO |
205 | (protocols & NFC_PROTO_FELICA_MASK |
206 | || protocols & NFC_PROTO_NFC_DEP_MASK)) { | |
637d85a7 | 207 | cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
eb9bc6e9 | 208 | NCI_NFC_F_PASSIVE_POLL_MODE; |
6a2968aa IE |
209 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
210 | cmd.num_disc_configs++; | |
211 | } | |
212 | ||
213 | nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, | |
eb9bc6e9 SO |
214 | (1 + (cmd.num_disc_configs * sizeof(struct disc_config))), |
215 | &cmd); | |
6a2968aa IE |
216 | } |
217 | ||
019c4fba IE |
218 | struct nci_rf_discover_select_param { |
219 | __u8 rf_discovery_id; | |
220 | __u8 rf_protocol; | |
221 | }; | |
222 | ||
223 | static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt) | |
224 | { | |
225 | struct nci_rf_discover_select_param *param = | |
eb9bc6e9 | 226 | (struct nci_rf_discover_select_param *)opt; |
019c4fba IE |
227 | struct nci_rf_discover_select_cmd cmd; |
228 | ||
229 | cmd.rf_discovery_id = param->rf_discovery_id; | |
230 | cmd.rf_protocol = param->rf_protocol; | |
231 | ||
232 | switch (cmd.rf_protocol) { | |
233 | case NCI_RF_PROTOCOL_ISO_DEP: | |
234 | cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP; | |
235 | break; | |
236 | ||
237 | case NCI_RF_PROTOCOL_NFC_DEP: | |
238 | cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP; | |
239 | break; | |
240 | ||
241 | default: | |
242 | cmd.rf_interface = NCI_RF_INTERFACE_FRAME; | |
243 | break; | |
244 | } | |
245 | ||
246 | nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD, | |
eb9bc6e9 | 247 | sizeof(struct nci_rf_discover_select_cmd), &cmd); |
019c4fba IE |
248 | } |
249 | ||
6a2968aa IE |
250 | static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) |
251 | { | |
252 | struct nci_rf_deactivate_cmd cmd; | |
253 | ||
254 | cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE; | |
255 | ||
256 | nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, | |
eb9bc6e9 | 257 | sizeof(struct nci_rf_deactivate_cmd), &cmd); |
6a2968aa IE |
258 | } |
259 | ||
260 | static int nci_open_device(struct nci_dev *ndev) | |
261 | { | |
262 | int rc = 0; | |
263 | ||
264 | mutex_lock(&ndev->req_lock); | |
265 | ||
266 | if (test_bit(NCI_UP, &ndev->flags)) { | |
267 | rc = -EALREADY; | |
268 | goto done; | |
269 | } | |
270 | ||
271 | if (ndev->ops->open(ndev)) { | |
272 | rc = -EIO; | |
273 | goto done; | |
274 | } | |
275 | ||
276 | atomic_set(&ndev->cmd_cnt, 1); | |
277 | ||
278 | set_bit(NCI_INIT, &ndev->flags); | |
279 | ||
280 | rc = __nci_request(ndev, nci_reset_req, 0, | |
eb9bc6e9 | 281 | msecs_to_jiffies(NCI_RESET_TIMEOUT)); |
6a2968aa IE |
282 | |
283 | if (!rc) { | |
284 | rc = __nci_request(ndev, nci_init_req, 0, | |
eb9bc6e9 | 285 | msecs_to_jiffies(NCI_INIT_TIMEOUT)); |
6a2968aa IE |
286 | } |
287 | ||
288 | if (!rc) { | |
289 | rc = __nci_request(ndev, nci_init_complete_req, 0, | |
eb9bc6e9 | 290 | msecs_to_jiffies(NCI_INIT_TIMEOUT)); |
6a2968aa IE |
291 | } |
292 | ||
293 | clear_bit(NCI_INIT, &ndev->flags); | |
294 | ||
295 | if (!rc) { | |
296 | set_bit(NCI_UP, &ndev->flags); | |
019c4fba | 297 | nci_clear_target_list(ndev); |
8939e47f | 298 | atomic_set(&ndev->state, NCI_IDLE); |
6a2968aa IE |
299 | } else { |
300 | /* Init failed, cleanup */ | |
301 | skb_queue_purge(&ndev->cmd_q); | |
302 | skb_queue_purge(&ndev->rx_q); | |
303 | skb_queue_purge(&ndev->tx_q); | |
304 | ||
305 | ndev->ops->close(ndev); | |
306 | ndev->flags = 0; | |
307 | } | |
308 | ||
309 | done: | |
310 | mutex_unlock(&ndev->req_lock); | |
311 | return rc; | |
312 | } | |
313 | ||
314 | static int nci_close_device(struct nci_dev *ndev) | |
315 | { | |
316 | nci_req_cancel(ndev, ENODEV); | |
317 | mutex_lock(&ndev->req_lock); | |
318 | ||
319 | if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { | |
320 | del_timer_sync(&ndev->cmd_timer); | |
c4bf98b2 | 321 | del_timer_sync(&ndev->data_timer); |
6a2968aa IE |
322 | mutex_unlock(&ndev->req_lock); |
323 | return 0; | |
324 | } | |
325 | ||
326 | /* Drop RX and TX queues */ | |
327 | skb_queue_purge(&ndev->rx_q); | |
328 | skb_queue_purge(&ndev->tx_q); | |
329 | ||
330 | /* Flush RX and TX wq */ | |
331 | flush_workqueue(ndev->rx_wq); | |
332 | flush_workqueue(ndev->tx_wq); | |
333 | ||
334 | /* Reset device */ | |
335 | skb_queue_purge(&ndev->cmd_q); | |
336 | atomic_set(&ndev->cmd_cnt, 1); | |
337 | ||
338 | set_bit(NCI_INIT, &ndev->flags); | |
339 | __nci_request(ndev, nci_reset_req, 0, | |
eb9bc6e9 | 340 | msecs_to_jiffies(NCI_RESET_TIMEOUT)); |
6a2968aa IE |
341 | clear_bit(NCI_INIT, &ndev->flags); |
342 | ||
343 | /* Flush cmd wq */ | |
344 | flush_workqueue(ndev->cmd_wq); | |
345 | ||
346 | /* After this point our queues are empty | |
347 | * and no works are scheduled. */ | |
348 | ndev->ops->close(ndev); | |
349 | ||
350 | /* Clear flags */ | |
351 | ndev->flags = 0; | |
352 | ||
353 | mutex_unlock(&ndev->req_lock); | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | /* NCI command timer function */ | |
359 | static void nci_cmd_timer(unsigned long arg) | |
360 | { | |
361 | struct nci_dev *ndev = (void *) arg; | |
362 | ||
6a2968aa IE |
363 | atomic_set(&ndev->cmd_cnt, 1); |
364 | queue_work(ndev->cmd_wq, &ndev->cmd_work); | |
365 | } | |
366 | ||
c4bf98b2 IE |
367 | /* NCI data exchange timer function */ |
368 | static void nci_data_timer(unsigned long arg) | |
369 | { | |
370 | struct nci_dev *ndev = (void *) arg; | |
371 | ||
372 | set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); | |
373 | queue_work(ndev->rx_wq, &ndev->rx_work); | |
374 | } | |
375 | ||
6a2968aa IE |
376 | static int nci_dev_up(struct nfc_dev *nfc_dev) |
377 | { | |
378 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
379 | ||
6a2968aa IE |
380 | return nci_open_device(ndev); |
381 | } | |
382 | ||
383 | static int nci_dev_down(struct nfc_dev *nfc_dev) | |
384 | { | |
385 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
386 | ||
6a2968aa IE |
387 | return nci_close_device(ndev); |
388 | } | |
389 | ||
390 | static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols) | |
391 | { | |
392 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
393 | int rc; | |
394 | ||
019c4fba | 395 | if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || |
eb9bc6e9 | 396 | (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { |
ed1e0ad8 | 397 | pr_err("unable to start poll, since poll is already active\n"); |
6a2968aa IE |
398 | return -EBUSY; |
399 | } | |
400 | ||
de054799 | 401 | if (ndev->target_active_prot) { |
ed1e0ad8 | 402 | pr_err("there is an active target\n"); |
de054799 IE |
403 | return -EBUSY; |
404 | } | |
405 | ||
019c4fba | 406 | if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || |
eb9bc6e9 | 407 | (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { |
019c4fba | 408 | pr_debug("target active or w4 select, implicitly deactivate\n"); |
6a2968aa IE |
409 | |
410 | rc = nci_request(ndev, nci_rf_deactivate_req, 0, | |
eb9bc6e9 | 411 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); |
6a2968aa IE |
412 | if (rc) |
413 | return -EBUSY; | |
414 | } | |
415 | ||
416 | rc = nci_request(ndev, nci_rf_discover_req, protocols, | |
eb9bc6e9 | 417 | msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); |
6a2968aa IE |
418 | |
419 | if (!rc) | |
420 | ndev->poll_prots = protocols; | |
421 | ||
422 | return rc; | |
423 | } | |
424 | ||
425 | static void nci_stop_poll(struct nfc_dev *nfc_dev) | |
426 | { | |
427 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
428 | ||
019c4fba | 429 | if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && |
eb9bc6e9 | 430 | (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { |
ed1e0ad8 | 431 | pr_err("unable to stop poll, since poll is not active\n"); |
6a2968aa IE |
432 | return; |
433 | } | |
434 | ||
435 | nci_request(ndev, nci_rf_deactivate_req, 0, | |
eb9bc6e9 | 436 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); |
6a2968aa IE |
437 | } |
438 | ||
439 | static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx, | |
eb9bc6e9 | 440 | __u32 protocol) |
6a2968aa IE |
441 | { |
442 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
019c4fba | 443 | struct nci_rf_discover_select_param param; |
6269cc83 | 444 | struct nfc_target *target = NULL; |
019c4fba IE |
445 | int i; |
446 | int rc = 0; | |
6a2968aa | 447 | |
24bf3304 | 448 | pr_debug("target_idx %d, protocol 0x%x\n", target_idx, protocol); |
6a2968aa | 449 | |
019c4fba | 450 | if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && |
eb9bc6e9 | 451 | (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { |
ed1e0ad8 | 452 | pr_err("there is no available target to activate\n"); |
6a2968aa IE |
453 | return -EINVAL; |
454 | } | |
455 | ||
456 | if (ndev->target_active_prot) { | |
ed1e0ad8 | 457 | pr_err("there is already an active target\n"); |
6a2968aa IE |
458 | return -EBUSY; |
459 | } | |
460 | ||
019c4fba IE |
461 | for (i = 0; i < ndev->n_targets; i++) { |
462 | if (ndev->targets[i].idx == target_idx) { | |
463 | target = &ndev->targets[i]; | |
464 | break; | |
465 | } | |
466 | } | |
467 | ||
468 | if (!target) { | |
469 | pr_err("unable to find the selected target\n"); | |
470 | return -EINVAL; | |
471 | } | |
472 | ||
473 | if (!(target->supported_protocols & (1 << protocol))) { | |
ed1e0ad8 JP |
474 | pr_err("target does not support the requested protocol 0x%x\n", |
475 | protocol); | |
6a2968aa IE |
476 | return -EINVAL; |
477 | } | |
478 | ||
019c4fba | 479 | if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { |
c4fbb651 | 480 | param.rf_discovery_id = target->logical_idx; |
019c4fba IE |
481 | |
482 | if (protocol == NFC_PROTO_JEWEL) | |
483 | param.rf_protocol = NCI_RF_PROTOCOL_T1T; | |
484 | else if (protocol == NFC_PROTO_MIFARE) | |
485 | param.rf_protocol = NCI_RF_PROTOCOL_T2T; | |
486 | else if (protocol == NFC_PROTO_FELICA) | |
487 | param.rf_protocol = NCI_RF_PROTOCOL_T3T; | |
488 | else if (protocol == NFC_PROTO_ISO14443) | |
489 | param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; | |
490 | else | |
491 | param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; | |
492 | ||
493 | rc = nci_request(ndev, nci_rf_discover_select_req, | |
eb9bc6e9 SO |
494 | (unsigned long)¶m, |
495 | msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT)); | |
019c4fba | 496 | } |
6a2968aa | 497 | |
019c4fba IE |
498 | if (!rc) |
499 | ndev->target_active_prot = protocol; | |
500 | ||
501 | return rc; | |
6a2968aa IE |
502 | } |
503 | ||
504 | static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx) | |
505 | { | |
506 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
507 | ||
24bf3304 | 508 | pr_debug("target_idx %d\n", target_idx); |
6a2968aa IE |
509 | |
510 | if (!ndev->target_active_prot) { | |
ed1e0ad8 | 511 | pr_err("unable to deactivate target, no active target\n"); |
6a2968aa IE |
512 | return; |
513 | } | |
514 | ||
515 | ndev->target_active_prot = 0; | |
516 | ||
8939e47f | 517 | if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { |
6a2968aa | 518 | nci_request(ndev, nci_rf_deactivate_req, 0, |
eb9bc6e9 | 519 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); |
6a2968aa IE |
520 | } |
521 | } | |
522 | ||
523 | static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx, | |
eb9bc6e9 SO |
524 | struct sk_buff *skb, |
525 | data_exchange_cb_t cb, void *cb_context) | |
6a2968aa IE |
526 | { |
527 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
38f04c6b | 528 | int rc; |
6a2968aa | 529 | |
24bf3304 | 530 | pr_debug("target_idx %d, len %d\n", target_idx, skb->len); |
6a2968aa IE |
531 | |
532 | if (!ndev->target_active_prot) { | |
ed1e0ad8 | 533 | pr_err("unable to exchange data, no active target\n"); |
6a2968aa IE |
534 | return -EINVAL; |
535 | } | |
536 | ||
38f04c6b IE |
537 | if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) |
538 | return -EBUSY; | |
539 | ||
6a2968aa IE |
540 | /* store cb and context to be used on receiving data */ |
541 | ndev->data_exchange_cb = cb; | |
542 | ndev->data_exchange_cb_context = cb_context; | |
543 | ||
e8c0dacd | 544 | rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); |
38f04c6b IE |
545 | if (rc) |
546 | clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); | |
547 | ||
548 | return rc; | |
6a2968aa IE |
549 | } |
550 | ||
551 | static struct nfc_ops nci_nfc_ops = { | |
552 | .dev_up = nci_dev_up, | |
553 | .dev_down = nci_dev_down, | |
554 | .start_poll = nci_start_poll, | |
555 | .stop_poll = nci_stop_poll, | |
556 | .activate_target = nci_activate_target, | |
557 | .deactivate_target = nci_deactivate_target, | |
558 | .data_exchange = nci_data_exchange, | |
559 | }; | |
560 | ||
561 | /* ---- Interface to NCI drivers ---- */ | |
562 | ||
563 | /** | |
564 | * nci_allocate_device - allocate a new nci device | |
565 | * | |
566 | * @ops: device operations | |
567 | * @supported_protocols: NFC protocols supported by the device | |
568 | */ | |
569 | struct nci_dev *nci_allocate_device(struct nci_ops *ops, | |
eb9bc6e9 SO |
570 | __u32 supported_protocols, |
571 | int tx_headroom, int tx_tailroom) | |
6a2968aa | 572 | { |
8ebafde0 | 573 | struct nci_dev *ndev; |
6a2968aa | 574 | |
24bf3304 | 575 | pr_debug("supported_protocols 0x%x\n", supported_protocols); |
6a2968aa IE |
576 | |
577 | if (!ops->open || !ops->close || !ops->send) | |
8ebafde0 | 578 | return NULL; |
6a2968aa IE |
579 | |
580 | if (!supported_protocols) | |
8ebafde0 | 581 | return NULL; |
6a2968aa IE |
582 | |
583 | ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); | |
584 | if (!ndev) | |
8ebafde0 | 585 | return NULL; |
6a2968aa IE |
586 | |
587 | ndev->ops = ops; | |
588 | ndev->tx_headroom = tx_headroom; | |
589 | ndev->tx_tailroom = tx_tailroom; | |
590 | ||
591 | ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, | |
eb9bc6e9 SO |
592 | supported_protocols, |
593 | tx_headroom + NCI_DATA_HDR_SIZE, | |
594 | tx_tailroom); | |
6a2968aa IE |
595 | if (!ndev->nfc_dev) |
596 | goto free_exit; | |
597 | ||
598 | nfc_set_drvdata(ndev->nfc_dev, ndev); | |
599 | ||
8ebafde0 | 600 | return ndev; |
6a2968aa IE |
601 | |
602 | free_exit: | |
603 | kfree(ndev); | |
8ebafde0 | 604 | return NULL; |
6a2968aa IE |
605 | } |
606 | EXPORT_SYMBOL(nci_allocate_device); | |
607 | ||
608 | /** | |
609 | * nci_free_device - deallocate nci device | |
610 | * | |
611 | * @ndev: The nci device to deallocate | |
612 | */ | |
613 | void nci_free_device(struct nci_dev *ndev) | |
614 | { | |
6a2968aa IE |
615 | nfc_free_device(ndev->nfc_dev); |
616 | kfree(ndev); | |
617 | } | |
618 | EXPORT_SYMBOL(nci_free_device); | |
619 | ||
620 | /** | |
621 | * nci_register_device - register a nci device in the nfc subsystem | |
622 | * | |
623 | * @dev: The nci device to register | |
624 | */ | |
625 | int nci_register_device(struct nci_dev *ndev) | |
626 | { | |
627 | int rc; | |
628 | struct device *dev = &ndev->nfc_dev->dev; | |
629 | char name[32]; | |
630 | ||
6a2968aa IE |
631 | rc = nfc_register_device(ndev->nfc_dev); |
632 | if (rc) | |
633 | goto exit; | |
634 | ||
635 | ndev->flags = 0; | |
636 | ||
637 | INIT_WORK(&ndev->cmd_work, nci_cmd_work); | |
638 | snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); | |
639 | ndev->cmd_wq = create_singlethread_workqueue(name); | |
640 | if (!ndev->cmd_wq) { | |
641 | rc = -ENOMEM; | |
642 | goto unreg_exit; | |
643 | } | |
644 | ||
645 | INIT_WORK(&ndev->rx_work, nci_rx_work); | |
646 | snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); | |
647 | ndev->rx_wq = create_singlethread_workqueue(name); | |
648 | if (!ndev->rx_wq) { | |
649 | rc = -ENOMEM; | |
650 | goto destroy_cmd_wq_exit; | |
651 | } | |
652 | ||
653 | INIT_WORK(&ndev->tx_work, nci_tx_work); | |
654 | snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); | |
655 | ndev->tx_wq = create_singlethread_workqueue(name); | |
656 | if (!ndev->tx_wq) { | |
657 | rc = -ENOMEM; | |
658 | goto destroy_rx_wq_exit; | |
659 | } | |
660 | ||
661 | skb_queue_head_init(&ndev->cmd_q); | |
662 | skb_queue_head_init(&ndev->rx_q); | |
663 | skb_queue_head_init(&ndev->tx_q); | |
664 | ||
665 | setup_timer(&ndev->cmd_timer, nci_cmd_timer, | |
eb9bc6e9 | 666 | (unsigned long) ndev); |
c4bf98b2 | 667 | setup_timer(&ndev->data_timer, nci_data_timer, |
eb9bc6e9 | 668 | (unsigned long) ndev); |
6a2968aa IE |
669 | |
670 | mutex_init(&ndev->req_lock); | |
671 | ||
672 | goto exit; | |
673 | ||
674 | destroy_rx_wq_exit: | |
675 | destroy_workqueue(ndev->rx_wq); | |
676 | ||
677 | destroy_cmd_wq_exit: | |
678 | destroy_workqueue(ndev->cmd_wq); | |
679 | ||
680 | unreg_exit: | |
681 | nfc_unregister_device(ndev->nfc_dev); | |
682 | ||
683 | exit: | |
684 | return rc; | |
685 | } | |
686 | EXPORT_SYMBOL(nci_register_device); | |
687 | ||
688 | /** | |
689 | * nci_unregister_device - unregister a nci device in the nfc subsystem | |
690 | * | |
691 | * @dev: The nci device to unregister | |
692 | */ | |
693 | void nci_unregister_device(struct nci_dev *ndev) | |
694 | { | |
6a2968aa IE |
695 | nci_close_device(ndev); |
696 | ||
697 | destroy_workqueue(ndev->cmd_wq); | |
698 | destroy_workqueue(ndev->rx_wq); | |
699 | destroy_workqueue(ndev->tx_wq); | |
700 | ||
701 | nfc_unregister_device(ndev->nfc_dev); | |
702 | } | |
703 | EXPORT_SYMBOL(nci_unregister_device); | |
704 | ||
705 | /** | |
706 | * nci_recv_frame - receive frame from NCI drivers | |
707 | * | |
708 | * @skb: The sk_buff to receive | |
709 | */ | |
710 | int nci_recv_frame(struct sk_buff *skb) | |
711 | { | |
712 | struct nci_dev *ndev = (struct nci_dev *) skb->dev; | |
713 | ||
24bf3304 | 714 | pr_debug("len %d\n", skb->len); |
6a2968aa IE |
715 | |
716 | if (!ndev || (!test_bit(NCI_UP, &ndev->flags) | |
eb9bc6e9 | 717 | && !test_bit(NCI_INIT, &ndev->flags))) { |
6a2968aa IE |
718 | kfree_skb(skb); |
719 | return -ENXIO; | |
720 | } | |
721 | ||
722 | /* Queue frame for rx worker thread */ | |
723 | skb_queue_tail(&ndev->rx_q, skb); | |
724 | queue_work(ndev->rx_wq, &ndev->rx_work); | |
725 | ||
726 | return 0; | |
727 | } | |
728 | EXPORT_SYMBOL(nci_recv_frame); | |
729 | ||
730 | static int nci_send_frame(struct sk_buff *skb) | |
731 | { | |
732 | struct nci_dev *ndev = (struct nci_dev *) skb->dev; | |
733 | ||
24bf3304 | 734 | pr_debug("len %d\n", skb->len); |
6a2968aa IE |
735 | |
736 | if (!ndev) { | |
737 | kfree_skb(skb); | |
738 | return -ENODEV; | |
739 | } | |
740 | ||
741 | /* Get rid of skb owner, prior to sending to the driver. */ | |
742 | skb_orphan(skb); | |
743 | ||
744 | return ndev->ops->send(skb); | |
745 | } | |
746 | ||
747 | /* Send NCI command */ | |
748 | int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) | |
749 | { | |
750 | struct nci_ctrl_hdr *hdr; | |
751 | struct sk_buff *skb; | |
752 | ||
24bf3304 | 753 | pr_debug("opcode 0x%x, plen %d\n", opcode, plen); |
6a2968aa IE |
754 | |
755 | skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); | |
756 | if (!skb) { | |
ed1e0ad8 | 757 | pr_err("no memory for command\n"); |
6a2968aa IE |
758 | return -ENOMEM; |
759 | } | |
760 | ||
761 | hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); | |
762 | hdr->gid = nci_opcode_gid(opcode); | |
763 | hdr->oid = nci_opcode_oid(opcode); | |
764 | hdr->plen = plen; | |
765 | ||
766 | nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); | |
767 | nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); | |
768 | ||
769 | if (plen) | |
770 | memcpy(skb_put(skb, plen), payload, plen); | |
771 | ||
772 | skb->dev = (void *) ndev; | |
773 | ||
774 | skb_queue_tail(&ndev->cmd_q, skb); | |
775 | queue_work(ndev->cmd_wq, &ndev->cmd_work); | |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
780 | /* ---- NCI TX Data worker thread ---- */ | |
781 | ||
782 | static void nci_tx_work(struct work_struct *work) | |
783 | { | |
784 | struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); | |
785 | struct sk_buff *skb; | |
786 | ||
24bf3304 | 787 | pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt)); |
6a2968aa IE |
788 | |
789 | /* Send queued tx data */ | |
790 | while (atomic_read(&ndev->credits_cnt)) { | |
791 | skb = skb_dequeue(&ndev->tx_q); | |
792 | if (!skb) | |
793 | return; | |
794 | ||
db98c829 IE |
795 | /* Check if data flow control is used */ |
796 | if (atomic_read(&ndev->credits_cnt) != | |
eb9bc6e9 | 797 | NCI_DATA_FLOW_CONTROL_NOT_USED) |
db98c829 | 798 | atomic_dec(&ndev->credits_cnt); |
6a2968aa | 799 | |
20c239c1 JP |
800 | pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", |
801 | nci_pbf(skb->data), | |
802 | nci_conn_id(skb->data), | |
803 | nci_plen(skb->data)); | |
6a2968aa IE |
804 | |
805 | nci_send_frame(skb); | |
c4bf98b2 IE |
806 | |
807 | mod_timer(&ndev->data_timer, | |
eb9bc6e9 | 808 | jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); |
6a2968aa IE |
809 | } |
810 | } | |
811 | ||
812 | /* ----- NCI RX worker thread (data & control) ----- */ | |
813 | ||
814 | static void nci_rx_work(struct work_struct *work) | |
815 | { | |
816 | struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); | |
817 | struct sk_buff *skb; | |
818 | ||
819 | while ((skb = skb_dequeue(&ndev->rx_q))) { | |
820 | /* Process frame */ | |
821 | switch (nci_mt(skb->data)) { | |
822 | case NCI_MT_RSP_PKT: | |
823 | nci_rsp_packet(ndev, skb); | |
824 | break; | |
825 | ||
826 | case NCI_MT_NTF_PKT: | |
827 | nci_ntf_packet(ndev, skb); | |
828 | break; | |
829 | ||
830 | case NCI_MT_DATA_PKT: | |
831 | nci_rx_data_packet(ndev, skb); | |
832 | break; | |
833 | ||
834 | default: | |
ed1e0ad8 | 835 | pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); |
6a2968aa IE |
836 | kfree_skb(skb); |
837 | break; | |
838 | } | |
839 | } | |
c4bf98b2 IE |
840 | |
841 | /* check if a data exchange timout has occurred */ | |
842 | if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { | |
843 | /* complete the data exchange transaction, if exists */ | |
844 | if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) | |
845 | nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT); | |
846 | ||
847 | clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); | |
848 | } | |
6a2968aa IE |
849 | } |
850 | ||
851 | /* ----- NCI TX CMD worker thread ----- */ | |
852 | ||
853 | static void nci_cmd_work(struct work_struct *work) | |
854 | { | |
855 | struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); | |
856 | struct sk_buff *skb; | |
857 | ||
24bf3304 | 858 | pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); |
6a2968aa IE |
859 | |
860 | /* Send queued command */ | |
861 | if (atomic_read(&ndev->cmd_cnt)) { | |
862 | skb = skb_dequeue(&ndev->cmd_q); | |
863 | if (!skb) | |
864 | return; | |
865 | ||
866 | atomic_dec(&ndev->cmd_cnt); | |
867 | ||
20c239c1 JP |
868 | pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", |
869 | nci_pbf(skb->data), | |
870 | nci_opcode_gid(nci_opcode(skb->data)), | |
871 | nci_opcode_oid(nci_opcode(skb->data)), | |
872 | nci_plen(skb->data)); | |
6a2968aa IE |
873 | |
874 | nci_send_frame(skb); | |
875 | ||
876 | mod_timer(&ndev->cmd_timer, | |
eb9bc6e9 | 877 | jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); |
6a2968aa IE |
878 | } |
879 | } |