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