Commit | Line | Data |
---|---|---|
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 | |
98b32dec | 23 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
6a2968aa IE |
24 | * |
25 | */ | |
26 | ||
52858b51 | 27 | #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
ed1e0ad8 | 28 | |
8a70e7f8 | 29 | #include <linux/module.h> |
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 | ||
7e035230 IE |
178 | struct nci_set_config_param { |
179 | __u8 id; | |
180 | size_t len; | |
181 | __u8 *val; | |
182 | }; | |
183 | ||
184 | static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt) | |
185 | { | |
186 | struct nci_set_config_param *param = (struct nci_set_config_param *)opt; | |
187 | struct nci_core_set_config_cmd cmd; | |
188 | ||
189 | BUG_ON(param->len > NCI_MAX_PARAM_LEN); | |
190 | ||
191 | cmd.num_params = 1; | |
192 | cmd.param.id = param->id; | |
193 | cmd.param.len = param->len; | |
194 | memcpy(cmd.param.val, param->val, param->len); | |
195 | ||
196 | nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd); | |
197 | } | |
198 | ||
6a2968aa IE |
199 | static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) |
200 | { | |
201 | struct nci_rf_disc_cmd cmd; | |
202 | __u32 protocols = opt; | |
203 | ||
204 | cmd.num_disc_configs = 0; | |
205 | ||
206 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | |
874934f4 SJ |
207 | (protocols & NFC_PROTO_JEWEL_MASK || |
208 | protocols & NFC_PROTO_MIFARE_MASK || | |
209 | protocols & NFC_PROTO_ISO14443_MASK || | |
210 | protocols & NFC_PROTO_NFC_DEP_MASK)) { | |
637d85a7 | 211 | cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
eb9bc6e9 | 212 | NCI_NFC_A_PASSIVE_POLL_MODE; |
6a2968aa IE |
213 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
214 | cmd.num_disc_configs++; | |
215 | } | |
216 | ||
217 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | |
01d719a2 | 218 | (protocols & NFC_PROTO_ISO14443_B_MASK)) { |
637d85a7 | 219 | cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
eb9bc6e9 | 220 | NCI_NFC_B_PASSIVE_POLL_MODE; |
6a2968aa IE |
221 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
222 | cmd.num_disc_configs++; | |
223 | } | |
224 | ||
225 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | |
874934f4 SJ |
226 | (protocols & NFC_PROTO_FELICA_MASK || |
227 | protocols & NFC_PROTO_NFC_DEP_MASK)) { | |
637d85a7 | 228 | cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
eb9bc6e9 | 229 | NCI_NFC_F_PASSIVE_POLL_MODE; |
6a2968aa IE |
230 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
231 | cmd.num_disc_configs++; | |
232 | } | |
233 | ||
234 | nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, | |
eb9bc6e9 SO |
235 | (1 + (cmd.num_disc_configs * sizeof(struct disc_config))), |
236 | &cmd); | |
6a2968aa IE |
237 | } |
238 | ||
019c4fba IE |
239 | struct nci_rf_discover_select_param { |
240 | __u8 rf_discovery_id; | |
241 | __u8 rf_protocol; | |
242 | }; | |
243 | ||
244 | static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt) | |
245 | { | |
246 | struct nci_rf_discover_select_param *param = | |
eb9bc6e9 | 247 | (struct nci_rf_discover_select_param *)opt; |
019c4fba IE |
248 | struct nci_rf_discover_select_cmd cmd; |
249 | ||
250 | cmd.rf_discovery_id = param->rf_discovery_id; | |
251 | cmd.rf_protocol = param->rf_protocol; | |
252 | ||
253 | switch (cmd.rf_protocol) { | |
254 | case NCI_RF_PROTOCOL_ISO_DEP: | |
255 | cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP; | |
256 | break; | |
257 | ||
258 | case NCI_RF_PROTOCOL_NFC_DEP: | |
259 | cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP; | |
260 | break; | |
261 | ||
262 | default: | |
263 | cmd.rf_interface = NCI_RF_INTERFACE_FRAME; | |
264 | break; | |
265 | } | |
266 | ||
267 | nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD, | |
eb9bc6e9 | 268 | sizeof(struct nci_rf_discover_select_cmd), &cmd); |
019c4fba IE |
269 | } |
270 | ||
6a2968aa IE |
271 | static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) |
272 | { | |
273 | struct nci_rf_deactivate_cmd cmd; | |
274 | ||
275 | cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE; | |
276 | ||
277 | nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, | |
eb9bc6e9 | 278 | sizeof(struct nci_rf_deactivate_cmd), &cmd); |
6a2968aa IE |
279 | } |
280 | ||
281 | static int nci_open_device(struct nci_dev *ndev) | |
282 | { | |
283 | int rc = 0; | |
284 | ||
285 | mutex_lock(&ndev->req_lock); | |
286 | ||
287 | if (test_bit(NCI_UP, &ndev->flags)) { | |
288 | rc = -EALREADY; | |
289 | goto done; | |
290 | } | |
291 | ||
292 | if (ndev->ops->open(ndev)) { | |
293 | rc = -EIO; | |
294 | goto done; | |
295 | } | |
296 | ||
297 | atomic_set(&ndev->cmd_cnt, 1); | |
298 | ||
299 | set_bit(NCI_INIT, &ndev->flags); | |
300 | ||
301 | rc = __nci_request(ndev, nci_reset_req, 0, | |
eb9bc6e9 | 302 | msecs_to_jiffies(NCI_RESET_TIMEOUT)); |
6a2968aa | 303 | |
44a589ca | 304 | if (ndev->ops->setup) |
86e8586e AK |
305 | ndev->ops->setup(ndev); |
306 | ||
6a2968aa IE |
307 | if (!rc) { |
308 | rc = __nci_request(ndev, nci_init_req, 0, | |
eb9bc6e9 | 309 | msecs_to_jiffies(NCI_INIT_TIMEOUT)); |
6a2968aa IE |
310 | } |
311 | ||
312 | if (!rc) { | |
313 | rc = __nci_request(ndev, nci_init_complete_req, 0, | |
eb9bc6e9 | 314 | msecs_to_jiffies(NCI_INIT_TIMEOUT)); |
6a2968aa IE |
315 | } |
316 | ||
317 | clear_bit(NCI_INIT, &ndev->flags); | |
318 | ||
319 | if (!rc) { | |
320 | set_bit(NCI_UP, &ndev->flags); | |
019c4fba | 321 | nci_clear_target_list(ndev); |
8939e47f | 322 | atomic_set(&ndev->state, NCI_IDLE); |
6a2968aa IE |
323 | } else { |
324 | /* Init failed, cleanup */ | |
325 | skb_queue_purge(&ndev->cmd_q); | |
326 | skb_queue_purge(&ndev->rx_q); | |
327 | skb_queue_purge(&ndev->tx_q); | |
328 | ||
329 | ndev->ops->close(ndev); | |
330 | ndev->flags = 0; | |
331 | } | |
332 | ||
333 | done: | |
334 | mutex_unlock(&ndev->req_lock); | |
335 | return rc; | |
336 | } | |
337 | ||
338 | static int nci_close_device(struct nci_dev *ndev) | |
339 | { | |
340 | nci_req_cancel(ndev, ENODEV); | |
341 | mutex_lock(&ndev->req_lock); | |
342 | ||
343 | if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { | |
344 | del_timer_sync(&ndev->cmd_timer); | |
c4bf98b2 | 345 | del_timer_sync(&ndev->data_timer); |
6a2968aa IE |
346 | mutex_unlock(&ndev->req_lock); |
347 | return 0; | |
348 | } | |
349 | ||
350 | /* Drop RX and TX queues */ | |
351 | skb_queue_purge(&ndev->rx_q); | |
352 | skb_queue_purge(&ndev->tx_q); | |
353 | ||
354 | /* Flush RX and TX wq */ | |
355 | flush_workqueue(ndev->rx_wq); | |
356 | flush_workqueue(ndev->tx_wq); | |
357 | ||
358 | /* Reset device */ | |
359 | skb_queue_purge(&ndev->cmd_q); | |
360 | atomic_set(&ndev->cmd_cnt, 1); | |
361 | ||
362 | set_bit(NCI_INIT, &ndev->flags); | |
363 | __nci_request(ndev, nci_reset_req, 0, | |
eb9bc6e9 | 364 | msecs_to_jiffies(NCI_RESET_TIMEOUT)); |
6a2968aa IE |
365 | clear_bit(NCI_INIT, &ndev->flags); |
366 | ||
fa9be5f0 AK |
367 | del_timer_sync(&ndev->cmd_timer); |
368 | ||
6a2968aa IE |
369 | /* Flush cmd wq */ |
370 | flush_workqueue(ndev->cmd_wq); | |
371 | ||
372 | /* After this point our queues are empty | |
373 | * and no works are scheduled. */ | |
374 | ndev->ops->close(ndev); | |
375 | ||
376 | /* Clear flags */ | |
377 | ndev->flags = 0; | |
378 | ||
379 | mutex_unlock(&ndev->req_lock); | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | /* NCI command timer function */ | |
385 | static void nci_cmd_timer(unsigned long arg) | |
386 | { | |
387 | struct nci_dev *ndev = (void *) arg; | |
388 | ||
6a2968aa IE |
389 | atomic_set(&ndev->cmd_cnt, 1); |
390 | queue_work(ndev->cmd_wq, &ndev->cmd_work); | |
391 | } | |
392 | ||
c4bf98b2 IE |
393 | /* NCI data exchange timer function */ |
394 | static void nci_data_timer(unsigned long arg) | |
395 | { | |
396 | struct nci_dev *ndev = (void *) arg; | |
397 | ||
398 | set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); | |
399 | queue_work(ndev->rx_wq, &ndev->rx_work); | |
400 | } | |
401 | ||
6a2968aa IE |
402 | static int nci_dev_up(struct nfc_dev *nfc_dev) |
403 | { | |
404 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
405 | ||
6a2968aa IE |
406 | return nci_open_device(ndev); |
407 | } | |
408 | ||
409 | static int nci_dev_down(struct nfc_dev *nfc_dev) | |
410 | { | |
411 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
412 | ||
6a2968aa IE |
413 | return nci_close_device(ndev); |
414 | } | |
415 | ||
22c15bf3 AK |
416 | int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val) |
417 | { | |
418 | struct nci_set_config_param param; | |
419 | ||
420 | if (!val || !len) | |
421 | return 0; | |
422 | ||
423 | param.id = id; | |
424 | param.len = len; | |
425 | param.val = val; | |
426 | ||
427 | return __nci_request(ndev, nci_set_config_req, (unsigned long)¶m, | |
428 | msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); | |
429 | } | |
430 | EXPORT_SYMBOL(nci_set_config); | |
431 | ||
7e035230 IE |
432 | static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev) |
433 | { | |
434 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
435 | struct nci_set_config_param param; | |
7e035230 IE |
436 | |
437 | param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len); | |
438 | if ((param.val == NULL) || (param.len == 0)) | |
f9fc36f4 | 439 | return 0; |
7e035230 | 440 | |
460d8f97 | 441 | if (param.len > NFC_MAX_GT_LEN) |
7e035230 IE |
442 | return -EINVAL; |
443 | ||
7e035230 | 444 | param.id = NCI_PN_ATR_REQ_GEN_BYTES; |
7e035230 | 445 | |
f9fc36f4 SJ |
446 | return nci_request(ndev, nci_set_config_req, (unsigned long)¶m, |
447 | msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); | |
7e035230 IE |
448 | } |
449 | ||
fe7c5800 SO |
450 | static int nci_start_poll(struct nfc_dev *nfc_dev, |
451 | __u32 im_protocols, __u32 tm_protocols) | |
6a2968aa IE |
452 | { |
453 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
454 | int rc; | |
455 | ||
019c4fba | 456 | if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || |
eb9bc6e9 | 457 | (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { |
ed1e0ad8 | 458 | pr_err("unable to start poll, since poll is already active\n"); |
6a2968aa IE |
459 | return -EBUSY; |
460 | } | |
461 | ||
de054799 | 462 | if (ndev->target_active_prot) { |
ed1e0ad8 | 463 | pr_err("there is an active target\n"); |
de054799 IE |
464 | return -EBUSY; |
465 | } | |
466 | ||
019c4fba | 467 | if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || |
eb9bc6e9 | 468 | (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { |
019c4fba | 469 | pr_debug("target active or w4 select, implicitly deactivate\n"); |
6a2968aa IE |
470 | |
471 | rc = nci_request(ndev, nci_rf_deactivate_req, 0, | |
eb9bc6e9 | 472 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); |
6a2968aa IE |
473 | if (rc) |
474 | return -EBUSY; | |
475 | } | |
476 | ||
7e035230 IE |
477 | if (im_protocols & NFC_PROTO_NFC_DEP_MASK) { |
478 | rc = nci_set_local_general_bytes(nfc_dev); | |
479 | if (rc) { | |
480 | pr_err("failed to set local general bytes\n"); | |
481 | return rc; | |
482 | } | |
483 | } | |
484 | ||
fe7c5800 | 485 | rc = nci_request(ndev, nci_rf_discover_req, im_protocols, |
eb9bc6e9 | 486 | msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); |
6a2968aa IE |
487 | |
488 | if (!rc) | |
fe7c5800 | 489 | ndev->poll_prots = im_protocols; |
6a2968aa IE |
490 | |
491 | return rc; | |
492 | } | |
493 | ||
494 | static void nci_stop_poll(struct nfc_dev *nfc_dev) | |
495 | { | |
496 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
497 | ||
019c4fba | 498 | if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && |
eb9bc6e9 | 499 | (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { |
ed1e0ad8 | 500 | pr_err("unable to stop poll, since poll is not active\n"); |
6a2968aa IE |
501 | return; |
502 | } | |
503 | ||
504 | nci_request(ndev, nci_rf_deactivate_req, 0, | |
eb9bc6e9 | 505 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); |
6a2968aa IE |
506 | } |
507 | ||
90099433 EL |
508 | static int nci_activate_target(struct nfc_dev *nfc_dev, |
509 | struct nfc_target *target, __u32 protocol) | |
6a2968aa IE |
510 | { |
511 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
019c4fba | 512 | struct nci_rf_discover_select_param param; |
90099433 | 513 | struct nfc_target *nci_target = NULL; |
019c4fba IE |
514 | int i; |
515 | int rc = 0; | |
6a2968aa | 516 | |
90099433 | 517 | pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol); |
6a2968aa | 518 | |
019c4fba | 519 | if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && |
eb9bc6e9 | 520 | (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { |
ed1e0ad8 | 521 | pr_err("there is no available target to activate\n"); |
6a2968aa IE |
522 | return -EINVAL; |
523 | } | |
524 | ||
525 | if (ndev->target_active_prot) { | |
ed1e0ad8 | 526 | pr_err("there is already an active target\n"); |
6a2968aa IE |
527 | return -EBUSY; |
528 | } | |
529 | ||
019c4fba | 530 | for (i = 0; i < ndev->n_targets; i++) { |
90099433 EL |
531 | if (ndev->targets[i].idx == target->idx) { |
532 | nci_target = &ndev->targets[i]; | |
019c4fba IE |
533 | break; |
534 | } | |
535 | } | |
536 | ||
90099433 | 537 | if (!nci_target) { |
019c4fba IE |
538 | pr_err("unable to find the selected target\n"); |
539 | return -EINVAL; | |
540 | } | |
541 | ||
90099433 | 542 | if (!(nci_target->supported_protocols & (1 << protocol))) { |
ed1e0ad8 JP |
543 | pr_err("target does not support the requested protocol 0x%x\n", |
544 | protocol); | |
6a2968aa IE |
545 | return -EINVAL; |
546 | } | |
547 | ||
019c4fba | 548 | if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { |
90099433 | 549 | param.rf_discovery_id = nci_target->logical_idx; |
019c4fba IE |
550 | |
551 | if (protocol == NFC_PROTO_JEWEL) | |
552 | param.rf_protocol = NCI_RF_PROTOCOL_T1T; | |
553 | else if (protocol == NFC_PROTO_MIFARE) | |
554 | param.rf_protocol = NCI_RF_PROTOCOL_T2T; | |
555 | else if (protocol == NFC_PROTO_FELICA) | |
556 | param.rf_protocol = NCI_RF_PROTOCOL_T3T; | |
01d719a2 SO |
557 | else if (protocol == NFC_PROTO_ISO14443 || |
558 | protocol == NFC_PROTO_ISO14443_B) | |
019c4fba IE |
559 | param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; |
560 | else | |
561 | param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; | |
562 | ||
563 | rc = nci_request(ndev, nci_rf_discover_select_req, | |
eb9bc6e9 SO |
564 | (unsigned long)¶m, |
565 | msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT)); | |
019c4fba | 566 | } |
6a2968aa | 567 | |
019c4fba IE |
568 | if (!rc) |
569 | ndev->target_active_prot = protocol; | |
570 | ||
571 | return rc; | |
6a2968aa IE |
572 | } |
573 | ||
90099433 EL |
574 | static void nci_deactivate_target(struct nfc_dev *nfc_dev, |
575 | struct nfc_target *target) | |
6a2968aa IE |
576 | { |
577 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
578 | ||
767f19ae | 579 | pr_debug("entry\n"); |
6a2968aa IE |
580 | |
581 | if (!ndev->target_active_prot) { | |
ed1e0ad8 | 582 | pr_err("unable to deactivate target, no active target\n"); |
6a2968aa IE |
583 | return; |
584 | } | |
585 | ||
586 | ndev->target_active_prot = 0; | |
587 | ||
8939e47f | 588 | if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { |
6a2968aa | 589 | nci_request(ndev, nci_rf_deactivate_req, 0, |
eb9bc6e9 | 590 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); |
6a2968aa IE |
591 | } |
592 | } | |
593 | ||
767f19ae IE |
594 | static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, |
595 | __u8 comm_mode, __u8 *gb, size_t gb_len) | |
596 | { | |
597 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
598 | int rc; | |
599 | ||
600 | pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode); | |
601 | ||
602 | rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP); | |
603 | if (rc) | |
604 | return rc; | |
605 | ||
606 | rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb, | |
607 | ndev->remote_gb_len); | |
608 | if (!rc) | |
609 | rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE, | |
610 | NFC_RF_INITIATOR); | |
611 | ||
612 | return rc; | |
613 | } | |
614 | ||
615 | static int nci_dep_link_down(struct nfc_dev *nfc_dev) | |
616 | { | |
617 | pr_debug("entry\n"); | |
618 | ||
619 | nci_deactivate_target(nfc_dev, NULL); | |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
624 | ||
be9ae4ce SO |
625 | static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, |
626 | struct sk_buff *skb, | |
627 | data_exchange_cb_t cb, void *cb_context) | |
6a2968aa IE |
628 | { |
629 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
38f04c6b | 630 | int rc; |
6a2968aa | 631 | |
90099433 | 632 | pr_debug("target_idx %d, len %d\n", target->idx, skb->len); |
6a2968aa IE |
633 | |
634 | if (!ndev->target_active_prot) { | |
ed1e0ad8 | 635 | pr_err("unable to exchange data, no active target\n"); |
6a2968aa IE |
636 | return -EINVAL; |
637 | } | |
638 | ||
38f04c6b IE |
639 | if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) |
640 | return -EBUSY; | |
641 | ||
6a2968aa IE |
642 | /* store cb and context to be used on receiving data */ |
643 | ndev->data_exchange_cb = cb; | |
644 | ndev->data_exchange_cb_context = cb_context; | |
645 | ||
e8c0dacd | 646 | rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); |
38f04c6b IE |
647 | if (rc) |
648 | clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); | |
649 | ||
650 | return rc; | |
6a2968aa IE |
651 | } |
652 | ||
0a946301 SO |
653 | static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx) |
654 | { | |
655 | return 0; | |
656 | } | |
657 | ||
658 | static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx) | |
659 | { | |
660 | return 0; | |
661 | } | |
662 | ||
663 | static int nci_discover_se(struct nfc_dev *nfc_dev) | |
664 | { | |
665 | return 0; | |
666 | } | |
667 | ||
6a2968aa IE |
668 | static struct nfc_ops nci_nfc_ops = { |
669 | .dev_up = nci_dev_up, | |
670 | .dev_down = nci_dev_down, | |
671 | .start_poll = nci_start_poll, | |
672 | .stop_poll = nci_stop_poll, | |
767f19ae IE |
673 | .dep_link_up = nci_dep_link_up, |
674 | .dep_link_down = nci_dep_link_down, | |
6a2968aa IE |
675 | .activate_target = nci_activate_target, |
676 | .deactivate_target = nci_deactivate_target, | |
be9ae4ce | 677 | .im_transceive = nci_transceive, |
0a946301 SO |
678 | .enable_se = nci_enable_se, |
679 | .disable_se = nci_disable_se, | |
680 | .discover_se = nci_discover_se, | |
6a2968aa IE |
681 | }; |
682 | ||
683 | /* ---- Interface to NCI drivers ---- */ | |
684 | ||
685 | /** | |
686 | * nci_allocate_device - allocate a new nci device | |
687 | * | |
688 | * @ops: device operations | |
689 | * @supported_protocols: NFC protocols supported by the device | |
690 | */ | |
691 | struct nci_dev *nci_allocate_device(struct nci_ops *ops, | |
eb9bc6e9 SO |
692 | __u32 supported_protocols, |
693 | int tx_headroom, int tx_tailroom) | |
6a2968aa | 694 | { |
8ebafde0 | 695 | struct nci_dev *ndev; |
6a2968aa | 696 | |
24bf3304 | 697 | pr_debug("supported_protocols 0x%x\n", supported_protocols); |
6a2968aa IE |
698 | |
699 | if (!ops->open || !ops->close || !ops->send) | |
8ebafde0 | 700 | return NULL; |
6a2968aa IE |
701 | |
702 | if (!supported_protocols) | |
8ebafde0 | 703 | return NULL; |
6a2968aa IE |
704 | |
705 | ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); | |
706 | if (!ndev) | |
8ebafde0 | 707 | return NULL; |
6a2968aa IE |
708 | |
709 | ndev->ops = ops; | |
710 | ndev->tx_headroom = tx_headroom; | |
711 | ndev->tx_tailroom = tx_tailroom; | |
712 | ||
713 | ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, | |
eb9bc6e9 SO |
714 | supported_protocols, |
715 | tx_headroom + NCI_DATA_HDR_SIZE, | |
716 | tx_tailroom); | |
6a2968aa IE |
717 | if (!ndev->nfc_dev) |
718 | goto free_exit; | |
719 | ||
720 | nfc_set_drvdata(ndev->nfc_dev, ndev); | |
721 | ||
8ebafde0 | 722 | return ndev; |
6a2968aa IE |
723 | |
724 | free_exit: | |
725 | kfree(ndev); | |
8ebafde0 | 726 | return NULL; |
6a2968aa IE |
727 | } |
728 | EXPORT_SYMBOL(nci_allocate_device); | |
729 | ||
730 | /** | |
731 | * nci_free_device - deallocate nci device | |
732 | * | |
733 | * @ndev: The nci device to deallocate | |
734 | */ | |
735 | void nci_free_device(struct nci_dev *ndev) | |
736 | { | |
6a2968aa IE |
737 | nfc_free_device(ndev->nfc_dev); |
738 | kfree(ndev); | |
739 | } | |
740 | EXPORT_SYMBOL(nci_free_device); | |
741 | ||
742 | /** | |
743 | * nci_register_device - register a nci device in the nfc subsystem | |
744 | * | |
745 | * @dev: The nci device to register | |
746 | */ | |
747 | int nci_register_device(struct nci_dev *ndev) | |
748 | { | |
749 | int rc; | |
750 | struct device *dev = &ndev->nfc_dev->dev; | |
751 | char name[32]; | |
752 | ||
6a2968aa IE |
753 | rc = nfc_register_device(ndev->nfc_dev); |
754 | if (rc) | |
755 | goto exit; | |
756 | ||
757 | ndev->flags = 0; | |
758 | ||
759 | INIT_WORK(&ndev->cmd_work, nci_cmd_work); | |
760 | snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); | |
761 | ndev->cmd_wq = create_singlethread_workqueue(name); | |
762 | if (!ndev->cmd_wq) { | |
763 | rc = -ENOMEM; | |
764 | goto unreg_exit; | |
765 | } | |
766 | ||
767 | INIT_WORK(&ndev->rx_work, nci_rx_work); | |
768 | snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); | |
769 | ndev->rx_wq = create_singlethread_workqueue(name); | |
770 | if (!ndev->rx_wq) { | |
771 | rc = -ENOMEM; | |
772 | goto destroy_cmd_wq_exit; | |
773 | } | |
774 | ||
775 | INIT_WORK(&ndev->tx_work, nci_tx_work); | |
776 | snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); | |
777 | ndev->tx_wq = create_singlethread_workqueue(name); | |
778 | if (!ndev->tx_wq) { | |
779 | rc = -ENOMEM; | |
780 | goto destroy_rx_wq_exit; | |
781 | } | |
782 | ||
783 | skb_queue_head_init(&ndev->cmd_q); | |
784 | skb_queue_head_init(&ndev->rx_q); | |
785 | skb_queue_head_init(&ndev->tx_q); | |
786 | ||
787 | setup_timer(&ndev->cmd_timer, nci_cmd_timer, | |
eb9bc6e9 | 788 | (unsigned long) ndev); |
c4bf98b2 | 789 | setup_timer(&ndev->data_timer, nci_data_timer, |
eb9bc6e9 | 790 | (unsigned long) ndev); |
6a2968aa IE |
791 | |
792 | mutex_init(&ndev->req_lock); | |
793 | ||
794 | goto exit; | |
795 | ||
796 | destroy_rx_wq_exit: | |
797 | destroy_workqueue(ndev->rx_wq); | |
798 | ||
799 | destroy_cmd_wq_exit: | |
800 | destroy_workqueue(ndev->cmd_wq); | |
801 | ||
802 | unreg_exit: | |
803 | nfc_unregister_device(ndev->nfc_dev); | |
804 | ||
805 | exit: | |
806 | return rc; | |
807 | } | |
808 | EXPORT_SYMBOL(nci_register_device); | |
809 | ||
810 | /** | |
811 | * nci_unregister_device - unregister a nci device in the nfc subsystem | |
812 | * | |
813 | * @dev: The nci device to unregister | |
814 | */ | |
815 | void nci_unregister_device(struct nci_dev *ndev) | |
816 | { | |
6a2968aa IE |
817 | nci_close_device(ndev); |
818 | ||
819 | destroy_workqueue(ndev->cmd_wq); | |
820 | destroy_workqueue(ndev->rx_wq); | |
821 | destroy_workqueue(ndev->tx_wq); | |
822 | ||
823 | nfc_unregister_device(ndev->nfc_dev); | |
824 | } | |
825 | EXPORT_SYMBOL(nci_unregister_device); | |
826 | ||
827 | /** | |
828 | * nci_recv_frame - receive frame from NCI drivers | |
829 | * | |
1095e69f | 830 | * @ndev: The nci device |
6a2968aa IE |
831 | * @skb: The sk_buff to receive |
832 | */ | |
1095e69f | 833 | int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb) |
6a2968aa | 834 | { |
24bf3304 | 835 | pr_debug("len %d\n", skb->len); |
6a2968aa | 836 | |
874934f4 SJ |
837 | if (!ndev || (!test_bit(NCI_UP, &ndev->flags) && |
838 | !test_bit(NCI_INIT, &ndev->flags))) { | |
6a2968aa IE |
839 | kfree_skb(skb); |
840 | return -ENXIO; | |
841 | } | |
842 | ||
843 | /* Queue frame for rx worker thread */ | |
844 | skb_queue_tail(&ndev->rx_q, skb); | |
845 | queue_work(ndev->rx_wq, &ndev->rx_work); | |
846 | ||
847 | return 0; | |
848 | } | |
849 | EXPORT_SYMBOL(nci_recv_frame); | |
850 | ||
1095e69f | 851 | static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb) |
6a2968aa | 852 | { |
24bf3304 | 853 | pr_debug("len %d\n", skb->len); |
6a2968aa IE |
854 | |
855 | if (!ndev) { | |
856 | kfree_skb(skb); | |
857 | return -ENODEV; | |
858 | } | |
859 | ||
860 | /* Get rid of skb owner, prior to sending to the driver. */ | |
861 | skb_orphan(skb); | |
862 | ||
1095e69f | 863 | return ndev->ops->send(ndev, skb); |
6a2968aa IE |
864 | } |
865 | ||
866 | /* Send NCI command */ | |
867 | int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) | |
868 | { | |
869 | struct nci_ctrl_hdr *hdr; | |
870 | struct sk_buff *skb; | |
871 | ||
24bf3304 | 872 | pr_debug("opcode 0x%x, plen %d\n", opcode, plen); |
6a2968aa IE |
873 | |
874 | skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); | |
875 | if (!skb) { | |
ed1e0ad8 | 876 | pr_err("no memory for command\n"); |
6a2968aa IE |
877 | return -ENOMEM; |
878 | } | |
879 | ||
880 | hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); | |
881 | hdr->gid = nci_opcode_gid(opcode); | |
882 | hdr->oid = nci_opcode_oid(opcode); | |
883 | hdr->plen = plen; | |
884 | ||
885 | nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); | |
886 | nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); | |
887 | ||
888 | if (plen) | |
889 | memcpy(skb_put(skb, plen), payload, plen); | |
890 | ||
6a2968aa IE |
891 | skb_queue_tail(&ndev->cmd_q, skb); |
892 | queue_work(ndev->cmd_wq, &ndev->cmd_work); | |
893 | ||
894 | return 0; | |
895 | } | |
896 | ||
897 | /* ---- NCI TX Data worker thread ---- */ | |
898 | ||
899 | static void nci_tx_work(struct work_struct *work) | |
900 | { | |
901 | struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); | |
902 | struct sk_buff *skb; | |
903 | ||
24bf3304 | 904 | pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt)); |
6a2968aa IE |
905 | |
906 | /* Send queued tx data */ | |
907 | while (atomic_read(&ndev->credits_cnt)) { | |
908 | skb = skb_dequeue(&ndev->tx_q); | |
909 | if (!skb) | |
910 | return; | |
911 | ||
db98c829 IE |
912 | /* Check if data flow control is used */ |
913 | if (atomic_read(&ndev->credits_cnt) != | |
eb9bc6e9 | 914 | NCI_DATA_FLOW_CONTROL_NOT_USED) |
db98c829 | 915 | atomic_dec(&ndev->credits_cnt); |
6a2968aa | 916 | |
20c239c1 JP |
917 | pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", |
918 | nci_pbf(skb->data), | |
919 | nci_conn_id(skb->data), | |
920 | nci_plen(skb->data)); | |
6a2968aa | 921 | |
1095e69f | 922 | nci_send_frame(ndev, skb); |
c4bf98b2 IE |
923 | |
924 | mod_timer(&ndev->data_timer, | |
eb9bc6e9 | 925 | jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); |
6a2968aa IE |
926 | } |
927 | } | |
928 | ||
929 | /* ----- NCI RX worker thread (data & control) ----- */ | |
930 | ||
931 | static void nci_rx_work(struct work_struct *work) | |
932 | { | |
933 | struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); | |
934 | struct sk_buff *skb; | |
935 | ||
936 | while ((skb = skb_dequeue(&ndev->rx_q))) { | |
937 | /* Process frame */ | |
938 | switch (nci_mt(skb->data)) { | |
939 | case NCI_MT_RSP_PKT: | |
940 | nci_rsp_packet(ndev, skb); | |
941 | break; | |
942 | ||
943 | case NCI_MT_NTF_PKT: | |
944 | nci_ntf_packet(ndev, skb); | |
945 | break; | |
946 | ||
947 | case NCI_MT_DATA_PKT: | |
948 | nci_rx_data_packet(ndev, skb); | |
949 | break; | |
950 | ||
951 | default: | |
ed1e0ad8 | 952 | pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); |
6a2968aa IE |
953 | kfree_skb(skb); |
954 | break; | |
955 | } | |
956 | } | |
c4bf98b2 IE |
957 | |
958 | /* check if a data exchange timout has occurred */ | |
959 | if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { | |
960 | /* complete the data exchange transaction, if exists */ | |
961 | if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) | |
962 | nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT); | |
963 | ||
964 | clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); | |
965 | } | |
6a2968aa IE |
966 | } |
967 | ||
968 | /* ----- NCI TX CMD worker thread ----- */ | |
969 | ||
970 | static void nci_cmd_work(struct work_struct *work) | |
971 | { | |
972 | struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); | |
973 | struct sk_buff *skb; | |
974 | ||
24bf3304 | 975 | pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); |
6a2968aa IE |
976 | |
977 | /* Send queued command */ | |
978 | if (atomic_read(&ndev->cmd_cnt)) { | |
979 | skb = skb_dequeue(&ndev->cmd_q); | |
980 | if (!skb) | |
981 | return; | |
982 | ||
983 | atomic_dec(&ndev->cmd_cnt); | |
984 | ||
20c239c1 JP |
985 | pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", |
986 | nci_pbf(skb->data), | |
987 | nci_opcode_gid(nci_opcode(skb->data)), | |
988 | nci_opcode_oid(nci_opcode(skb->data)), | |
989 | nci_plen(skb->data)); | |
6a2968aa | 990 | |
1095e69f | 991 | nci_send_frame(ndev, skb); |
6a2968aa IE |
992 | |
993 | mod_timer(&ndev->cmd_timer, | |
eb9bc6e9 | 994 | jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); |
6a2968aa IE |
995 | } |
996 | } | |
8a70e7f8 DJ |
997 | |
998 | MODULE_LICENSE("GPL"); |