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 | ||
90099433 EL |
439 | static int nci_activate_target(struct nfc_dev *nfc_dev, |
440 | struct nfc_target *target, __u32 protocol) | |
6a2968aa IE |
441 | { |
442 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
019c4fba | 443 | struct nci_rf_discover_select_param param; |
90099433 | 444 | struct nfc_target *nci_target = NULL; |
019c4fba IE |
445 | int i; |
446 | int rc = 0; | |
6a2968aa | 447 | |
90099433 | 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 | 461 | for (i = 0; i < ndev->n_targets; i++) { |
90099433 EL |
462 | if (ndev->targets[i].idx == target->idx) { |
463 | nci_target = &ndev->targets[i]; | |
019c4fba IE |
464 | break; |
465 | } | |
466 | } | |
467 | ||
90099433 | 468 | if (!nci_target) { |
019c4fba IE |
469 | pr_err("unable to find the selected target\n"); |
470 | return -EINVAL; | |
471 | } | |
472 | ||
90099433 | 473 | if (!(nci_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) { |
90099433 | 480 | param.rf_discovery_id = nci_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 | ||
90099433 EL |
504 | static void nci_deactivate_target(struct nfc_dev *nfc_dev, |
505 | struct nfc_target *target) | |
6a2968aa IE |
506 | { |
507 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
508 | ||
90099433 | 509 | pr_debug("target_idx %d\n", target->idx); |
6a2968aa IE |
510 | |
511 | if (!ndev->target_active_prot) { | |
ed1e0ad8 | 512 | pr_err("unable to deactivate target, no active target\n"); |
6a2968aa IE |
513 | return; |
514 | } | |
515 | ||
516 | ndev->target_active_prot = 0; | |
517 | ||
8939e47f | 518 | if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { |
6a2968aa | 519 | nci_request(ndev, nci_rf_deactivate_req, 0, |
eb9bc6e9 | 520 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); |
6a2968aa IE |
521 | } |
522 | } | |
523 | ||
90099433 | 524 | static int nci_data_exchange(struct nfc_dev *nfc_dev, struct nfc_target *target, |
eb9bc6e9 SO |
525 | struct sk_buff *skb, |
526 | data_exchange_cb_t cb, void *cb_context) | |
6a2968aa IE |
527 | { |
528 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
38f04c6b | 529 | int rc; |
6a2968aa | 530 | |
90099433 | 531 | pr_debug("target_idx %d, len %d\n", target->idx, skb->len); |
6a2968aa IE |
532 | |
533 | if (!ndev->target_active_prot) { | |
ed1e0ad8 | 534 | pr_err("unable to exchange data, no active target\n"); |
6a2968aa IE |
535 | return -EINVAL; |
536 | } | |
537 | ||
38f04c6b IE |
538 | if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) |
539 | return -EBUSY; | |
540 | ||
6a2968aa IE |
541 | /* store cb and context to be used on receiving data */ |
542 | ndev->data_exchange_cb = cb; | |
543 | ndev->data_exchange_cb_context = cb_context; | |
544 | ||
e8c0dacd | 545 | rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); |
38f04c6b IE |
546 | if (rc) |
547 | clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); | |
548 | ||
549 | return rc; | |
6a2968aa IE |
550 | } |
551 | ||
552 | static struct nfc_ops nci_nfc_ops = { | |
553 | .dev_up = nci_dev_up, | |
554 | .dev_down = nci_dev_down, | |
555 | .start_poll = nci_start_poll, | |
556 | .stop_poll = nci_stop_poll, | |
557 | .activate_target = nci_activate_target, | |
558 | .deactivate_target = nci_deactivate_target, | |
559 | .data_exchange = nci_data_exchange, | |
560 | }; | |
561 | ||
562 | /* ---- Interface to NCI drivers ---- */ | |
563 | ||
564 | /** | |
565 | * nci_allocate_device - allocate a new nci device | |
566 | * | |
567 | * @ops: device operations | |
568 | * @supported_protocols: NFC protocols supported by the device | |
569 | */ | |
570 | struct nci_dev *nci_allocate_device(struct nci_ops *ops, | |
eb9bc6e9 SO |
571 | __u32 supported_protocols, |
572 | int tx_headroom, int tx_tailroom) | |
6a2968aa | 573 | { |
8ebafde0 | 574 | struct nci_dev *ndev; |
6a2968aa | 575 | |
24bf3304 | 576 | pr_debug("supported_protocols 0x%x\n", supported_protocols); |
6a2968aa IE |
577 | |
578 | if (!ops->open || !ops->close || !ops->send) | |
8ebafde0 | 579 | return NULL; |
6a2968aa IE |
580 | |
581 | if (!supported_protocols) | |
8ebafde0 | 582 | return NULL; |
6a2968aa IE |
583 | |
584 | ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); | |
585 | if (!ndev) | |
8ebafde0 | 586 | return NULL; |
6a2968aa IE |
587 | |
588 | ndev->ops = ops; | |
589 | ndev->tx_headroom = tx_headroom; | |
590 | ndev->tx_tailroom = tx_tailroom; | |
591 | ||
592 | ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, | |
eb9bc6e9 SO |
593 | supported_protocols, |
594 | tx_headroom + NCI_DATA_HDR_SIZE, | |
595 | tx_tailroom); | |
6a2968aa IE |
596 | if (!ndev->nfc_dev) |
597 | goto free_exit; | |
598 | ||
599 | nfc_set_drvdata(ndev->nfc_dev, ndev); | |
600 | ||
8ebafde0 | 601 | return ndev; |
6a2968aa IE |
602 | |
603 | free_exit: | |
604 | kfree(ndev); | |
8ebafde0 | 605 | return NULL; |
6a2968aa IE |
606 | } |
607 | EXPORT_SYMBOL(nci_allocate_device); | |
608 | ||
609 | /** | |
610 | * nci_free_device - deallocate nci device | |
611 | * | |
612 | * @ndev: The nci device to deallocate | |
613 | */ | |
614 | void nci_free_device(struct nci_dev *ndev) | |
615 | { | |
6a2968aa IE |
616 | nfc_free_device(ndev->nfc_dev); |
617 | kfree(ndev); | |
618 | } | |
619 | EXPORT_SYMBOL(nci_free_device); | |
620 | ||
621 | /** | |
622 | * nci_register_device - register a nci device in the nfc subsystem | |
623 | * | |
624 | * @dev: The nci device to register | |
625 | */ | |
626 | int nci_register_device(struct nci_dev *ndev) | |
627 | { | |
628 | int rc; | |
629 | struct device *dev = &ndev->nfc_dev->dev; | |
630 | char name[32]; | |
631 | ||
6a2968aa IE |
632 | rc = nfc_register_device(ndev->nfc_dev); |
633 | if (rc) | |
634 | goto exit; | |
635 | ||
636 | ndev->flags = 0; | |
637 | ||
638 | INIT_WORK(&ndev->cmd_work, nci_cmd_work); | |
639 | snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); | |
640 | ndev->cmd_wq = create_singlethread_workqueue(name); | |
641 | if (!ndev->cmd_wq) { | |
642 | rc = -ENOMEM; | |
643 | goto unreg_exit; | |
644 | } | |
645 | ||
646 | INIT_WORK(&ndev->rx_work, nci_rx_work); | |
647 | snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); | |
648 | ndev->rx_wq = create_singlethread_workqueue(name); | |
649 | if (!ndev->rx_wq) { | |
650 | rc = -ENOMEM; | |
651 | goto destroy_cmd_wq_exit; | |
652 | } | |
653 | ||
654 | INIT_WORK(&ndev->tx_work, nci_tx_work); | |
655 | snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); | |
656 | ndev->tx_wq = create_singlethread_workqueue(name); | |
657 | if (!ndev->tx_wq) { | |
658 | rc = -ENOMEM; | |
659 | goto destroy_rx_wq_exit; | |
660 | } | |
661 | ||
662 | skb_queue_head_init(&ndev->cmd_q); | |
663 | skb_queue_head_init(&ndev->rx_q); | |
664 | skb_queue_head_init(&ndev->tx_q); | |
665 | ||
666 | setup_timer(&ndev->cmd_timer, nci_cmd_timer, | |
eb9bc6e9 | 667 | (unsigned long) ndev); |
c4bf98b2 | 668 | setup_timer(&ndev->data_timer, nci_data_timer, |
eb9bc6e9 | 669 | (unsigned long) ndev); |
6a2968aa IE |
670 | |
671 | mutex_init(&ndev->req_lock); | |
672 | ||
673 | goto exit; | |
674 | ||
675 | destroy_rx_wq_exit: | |
676 | destroy_workqueue(ndev->rx_wq); | |
677 | ||
678 | destroy_cmd_wq_exit: | |
679 | destroy_workqueue(ndev->cmd_wq); | |
680 | ||
681 | unreg_exit: | |
682 | nfc_unregister_device(ndev->nfc_dev); | |
683 | ||
684 | exit: | |
685 | return rc; | |
686 | } | |
687 | EXPORT_SYMBOL(nci_register_device); | |
688 | ||
689 | /** | |
690 | * nci_unregister_device - unregister a nci device in the nfc subsystem | |
691 | * | |
692 | * @dev: The nci device to unregister | |
693 | */ | |
694 | void nci_unregister_device(struct nci_dev *ndev) | |
695 | { | |
6a2968aa IE |
696 | nci_close_device(ndev); |
697 | ||
698 | destroy_workqueue(ndev->cmd_wq); | |
699 | destroy_workqueue(ndev->rx_wq); | |
700 | destroy_workqueue(ndev->tx_wq); | |
701 | ||
702 | nfc_unregister_device(ndev->nfc_dev); | |
703 | } | |
704 | EXPORT_SYMBOL(nci_unregister_device); | |
705 | ||
706 | /** | |
707 | * nci_recv_frame - receive frame from NCI drivers | |
708 | * | |
709 | * @skb: The sk_buff to receive | |
710 | */ | |
711 | int nci_recv_frame(struct sk_buff *skb) | |
712 | { | |
713 | struct nci_dev *ndev = (struct nci_dev *) skb->dev; | |
714 | ||
24bf3304 | 715 | pr_debug("len %d\n", skb->len); |
6a2968aa IE |
716 | |
717 | if (!ndev || (!test_bit(NCI_UP, &ndev->flags) | |
eb9bc6e9 | 718 | && !test_bit(NCI_INIT, &ndev->flags))) { |
6a2968aa IE |
719 | kfree_skb(skb); |
720 | return -ENXIO; | |
721 | } | |
722 | ||
723 | /* Queue frame for rx worker thread */ | |
724 | skb_queue_tail(&ndev->rx_q, skb); | |
725 | queue_work(ndev->rx_wq, &ndev->rx_work); | |
726 | ||
727 | return 0; | |
728 | } | |
729 | EXPORT_SYMBOL(nci_recv_frame); | |
730 | ||
731 | static int nci_send_frame(struct sk_buff *skb) | |
732 | { | |
733 | struct nci_dev *ndev = (struct nci_dev *) skb->dev; | |
734 | ||
24bf3304 | 735 | pr_debug("len %d\n", skb->len); |
6a2968aa IE |
736 | |
737 | if (!ndev) { | |
738 | kfree_skb(skb); | |
739 | return -ENODEV; | |
740 | } | |
741 | ||
742 | /* Get rid of skb owner, prior to sending to the driver. */ | |
743 | skb_orphan(skb); | |
744 | ||
745 | return ndev->ops->send(skb); | |
746 | } | |
747 | ||
748 | /* Send NCI command */ | |
749 | int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) | |
750 | { | |
751 | struct nci_ctrl_hdr *hdr; | |
752 | struct sk_buff *skb; | |
753 | ||
24bf3304 | 754 | pr_debug("opcode 0x%x, plen %d\n", opcode, plen); |
6a2968aa IE |
755 | |
756 | skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); | |
757 | if (!skb) { | |
ed1e0ad8 | 758 | pr_err("no memory for command\n"); |
6a2968aa IE |
759 | return -ENOMEM; |
760 | } | |
761 | ||
762 | hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); | |
763 | hdr->gid = nci_opcode_gid(opcode); | |
764 | hdr->oid = nci_opcode_oid(opcode); | |
765 | hdr->plen = plen; | |
766 | ||
767 | nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); | |
768 | nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); | |
769 | ||
770 | if (plen) | |
771 | memcpy(skb_put(skb, plen), payload, plen); | |
772 | ||
773 | skb->dev = (void *) ndev; | |
774 | ||
775 | skb_queue_tail(&ndev->cmd_q, skb); | |
776 | queue_work(ndev->cmd_wq, &ndev->cmd_work); | |
777 | ||
778 | return 0; | |
779 | } | |
780 | ||
781 | /* ---- NCI TX Data worker thread ---- */ | |
782 | ||
783 | static void nci_tx_work(struct work_struct *work) | |
784 | { | |
785 | struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); | |
786 | struct sk_buff *skb; | |
787 | ||
24bf3304 | 788 | pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt)); |
6a2968aa IE |
789 | |
790 | /* Send queued tx data */ | |
791 | while (atomic_read(&ndev->credits_cnt)) { | |
792 | skb = skb_dequeue(&ndev->tx_q); | |
793 | if (!skb) | |
794 | return; | |
795 | ||
db98c829 IE |
796 | /* Check if data flow control is used */ |
797 | if (atomic_read(&ndev->credits_cnt) != | |
eb9bc6e9 | 798 | NCI_DATA_FLOW_CONTROL_NOT_USED) |
db98c829 | 799 | atomic_dec(&ndev->credits_cnt); |
6a2968aa | 800 | |
20c239c1 JP |
801 | pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", |
802 | nci_pbf(skb->data), | |
803 | nci_conn_id(skb->data), | |
804 | nci_plen(skb->data)); | |
6a2968aa IE |
805 | |
806 | nci_send_frame(skb); | |
c4bf98b2 IE |
807 | |
808 | mod_timer(&ndev->data_timer, | |
eb9bc6e9 | 809 | jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); |
6a2968aa IE |
810 | } |
811 | } | |
812 | ||
813 | /* ----- NCI RX worker thread (data & control) ----- */ | |
814 | ||
815 | static void nci_rx_work(struct work_struct *work) | |
816 | { | |
817 | struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); | |
818 | struct sk_buff *skb; | |
819 | ||
820 | while ((skb = skb_dequeue(&ndev->rx_q))) { | |
821 | /* Process frame */ | |
822 | switch (nci_mt(skb->data)) { | |
823 | case NCI_MT_RSP_PKT: | |
824 | nci_rsp_packet(ndev, skb); | |
825 | break; | |
826 | ||
827 | case NCI_MT_NTF_PKT: | |
828 | nci_ntf_packet(ndev, skb); | |
829 | break; | |
830 | ||
831 | case NCI_MT_DATA_PKT: | |
832 | nci_rx_data_packet(ndev, skb); | |
833 | break; | |
834 | ||
835 | default: | |
ed1e0ad8 | 836 | pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); |
6a2968aa IE |
837 | kfree_skb(skb); |
838 | break; | |
839 | } | |
840 | } | |
c4bf98b2 IE |
841 | |
842 | /* check if a data exchange timout has occurred */ | |
843 | if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { | |
844 | /* complete the data exchange transaction, if exists */ | |
845 | if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) | |
846 | nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT); | |
847 | ||
848 | clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); | |
849 | } | |
6a2968aa IE |
850 | } |
851 | ||
852 | /* ----- NCI TX CMD worker thread ----- */ | |
853 | ||
854 | static void nci_cmd_work(struct work_struct *work) | |
855 | { | |
856 | struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); | |
857 | struct sk_buff *skb; | |
858 | ||
24bf3304 | 859 | pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); |
6a2968aa IE |
860 | |
861 | /* Send queued command */ | |
862 | if (atomic_read(&ndev->cmd_cnt)) { | |
863 | skb = skb_dequeue(&ndev->cmd_q); | |
864 | if (!skb) | |
865 | return; | |
866 | ||
867 | atomic_dec(&ndev->cmd_cnt); | |
868 | ||
20c239c1 JP |
869 | pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", |
870 | nci_pbf(skb->data), | |
871 | nci_opcode_gid(nci_opcode(skb->data)), | |
872 | nci_opcode_oid(nci_opcode(skb->data)), | |
873 | nci_plen(skb->data)); | |
6a2968aa IE |
874 | |
875 | nci_send_frame(skb); | |
876 | ||
877 | mod_timer(&ndev->cmd_timer, | |
eb9bc6e9 | 878 | jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); |
6a2968aa IE |
879 | } |
880 | } |