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 | |
8a70e7f8 | 30 | #include <linux/module.h> |
6a2968aa IE |
31 | #include <linux/types.h> |
32 | #include <linux/workqueue.h> | |
33 | #include <linux/completion.h> | |
bc3b2d7f | 34 | #include <linux/export.h> |
6a2968aa IE |
35 | #include <linux/sched.h> |
36 | #include <linux/bitops.h> | |
37 | #include <linux/skbuff.h> | |
38 | ||
39 | #include "../nfc.h" | |
40 | #include <net/nfc/nci.h> | |
41 | #include <net/nfc/nci_core.h> | |
42 | #include <linux/nfc.h> | |
43 | ||
44 | static void nci_cmd_work(struct work_struct *work); | |
45 | static void nci_rx_work(struct work_struct *work); | |
46 | static void nci_tx_work(struct work_struct *work); | |
47 | ||
48 | /* ---- NCI requests ---- */ | |
49 | ||
50 | void nci_req_complete(struct nci_dev *ndev, int result) | |
51 | { | |
52 | if (ndev->req_status == NCI_REQ_PEND) { | |
53 | ndev->req_result = result; | |
54 | ndev->req_status = NCI_REQ_DONE; | |
55 | complete(&ndev->req_completion); | |
56 | } | |
57 | } | |
58 | ||
59 | static void nci_req_cancel(struct nci_dev *ndev, int err) | |
60 | { | |
61 | if (ndev->req_status == NCI_REQ_PEND) { | |
62 | ndev->req_result = err; | |
63 | ndev->req_status = NCI_REQ_CANCELED; | |
64 | complete(&ndev->req_completion); | |
65 | } | |
66 | } | |
67 | ||
68 | /* Execute request and wait for completion. */ | |
69 | static int __nci_request(struct nci_dev *ndev, | |
eb9bc6e9 SO |
70 | void (*req)(struct nci_dev *ndev, unsigned long opt), |
71 | unsigned long opt, __u32 timeout) | |
6a2968aa IE |
72 | { |
73 | int rc = 0; | |
f8c141c3 | 74 | long completion_rc; |
6a2968aa IE |
75 | |
76 | ndev->req_status = NCI_REQ_PEND; | |
77 | ||
78 | init_completion(&ndev->req_completion); | |
79 | req(ndev, opt); | |
eb9bc6e9 SO |
80 | completion_rc = |
81 | wait_for_completion_interruptible_timeout(&ndev->req_completion, | |
82 | timeout); | |
6a2968aa | 83 | |
20c239c1 | 84 | pr_debug("wait_for_completion return %ld\n", completion_rc); |
6a2968aa IE |
85 | |
86 | if (completion_rc > 0) { | |
87 | switch (ndev->req_status) { | |
88 | case NCI_REQ_DONE: | |
89 | rc = nci_to_errno(ndev->req_result); | |
90 | break; | |
91 | ||
92 | case NCI_REQ_CANCELED: | |
93 | rc = -ndev->req_result; | |
94 | break; | |
95 | ||
96 | default: | |
97 | rc = -ETIMEDOUT; | |
98 | break; | |
99 | } | |
100 | } else { | |
ed1e0ad8 JP |
101 | pr_err("wait_for_completion_interruptible_timeout failed %ld\n", |
102 | completion_rc); | |
6a2968aa IE |
103 | |
104 | rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc)); | |
105 | } | |
106 | ||
107 | ndev->req_status = ndev->req_result = 0; | |
108 | ||
109 | return rc; | |
110 | } | |
111 | ||
112 | static inline int nci_request(struct nci_dev *ndev, | |
eb9bc6e9 SO |
113 | void (*req)(struct nci_dev *ndev, |
114 | unsigned long opt), | |
115 | unsigned long opt, __u32 timeout) | |
6a2968aa IE |
116 | { |
117 | int rc; | |
118 | ||
119 | if (!test_bit(NCI_UP, &ndev->flags)) | |
120 | return -ENETDOWN; | |
121 | ||
122 | /* Serialize all requests */ | |
123 | mutex_lock(&ndev->req_lock); | |
124 | rc = __nci_request(ndev, req, opt, timeout); | |
125 | mutex_unlock(&ndev->req_lock); | |
126 | ||
127 | return rc; | |
128 | } | |
129 | ||
130 | static void nci_reset_req(struct nci_dev *ndev, unsigned long opt) | |
131 | { | |
e8c0dacd IE |
132 | struct nci_core_reset_cmd cmd; |
133 | ||
134 | cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG; | |
135 | nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd); | |
6a2968aa IE |
136 | } |
137 | ||
138 | static void nci_init_req(struct nci_dev *ndev, unsigned long opt) | |
139 | { | |
140 | nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL); | |
141 | } | |
142 | ||
143 | static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt) | |
144 | { | |
2eb1dc10 IE |
145 | struct nci_rf_disc_map_cmd cmd; |
146 | struct disc_map_config *cfg = cmd.mapping_configs; | |
147 | __u8 *num = &cmd.num_mapping_configs; | |
6a2968aa IE |
148 | int i; |
149 | ||
6a2968aa | 150 | /* set rf mapping configurations */ |
2eb1dc10 | 151 | *num = 0; |
6a2968aa IE |
152 | |
153 | /* by default mapping is set to NCI_RF_INTERFACE_FRAME */ | |
154 | for (i = 0; i < ndev->num_supported_rf_interfaces; i++) { | |
155 | if (ndev->supported_rf_interfaces[i] == | |
eb9bc6e9 | 156 | NCI_RF_INTERFACE_ISO_DEP) { |
2eb1dc10 | 157 | cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; |
637d85a7 IE |
158 | cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | |
159 | NCI_DISC_MAP_MODE_LISTEN; | |
160 | cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP; | |
2eb1dc10 | 161 | (*num)++; |
6a2968aa | 162 | } else if (ndev->supported_rf_interfaces[i] == |
eb9bc6e9 | 163 | NCI_RF_INTERFACE_NFC_DEP) { |
2eb1dc10 | 164 | cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; |
637d85a7 IE |
165 | cfg[*num].mode = NCI_DISC_MAP_MODE_POLL | |
166 | NCI_DISC_MAP_MODE_LISTEN; | |
167 | cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP; | |
2eb1dc10 | 168 | (*num)++; |
6a2968aa IE |
169 | } |
170 | ||
2eb1dc10 | 171 | if (*num == NCI_MAX_NUM_MAPPING_CONFIGS) |
6a2968aa IE |
172 | break; |
173 | } | |
174 | ||
175 | nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD, | |
eb9bc6e9 | 176 | (1 + ((*num) * sizeof(struct disc_map_config))), &cmd); |
6a2968aa IE |
177 | } |
178 | ||
7e035230 IE |
179 | struct nci_set_config_param { |
180 | __u8 id; | |
181 | size_t len; | |
182 | __u8 *val; | |
183 | }; | |
184 | ||
185 | static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt) | |
186 | { | |
187 | struct nci_set_config_param *param = (struct nci_set_config_param *)opt; | |
188 | struct nci_core_set_config_cmd cmd; | |
189 | ||
190 | BUG_ON(param->len > NCI_MAX_PARAM_LEN); | |
191 | ||
192 | cmd.num_params = 1; | |
193 | cmd.param.id = param->id; | |
194 | cmd.param.len = param->len; | |
195 | memcpy(cmd.param.val, param->val, param->len); | |
196 | ||
197 | nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd); | |
198 | } | |
199 | ||
6a2968aa IE |
200 | static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt) |
201 | { | |
202 | struct nci_rf_disc_cmd cmd; | |
203 | __u32 protocols = opt; | |
204 | ||
205 | cmd.num_disc_configs = 0; | |
206 | ||
207 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | |
874934f4 SJ |
208 | (protocols & NFC_PROTO_JEWEL_MASK || |
209 | protocols & NFC_PROTO_MIFARE_MASK || | |
210 | protocols & NFC_PROTO_ISO14443_MASK || | |
211 | protocols & NFC_PROTO_NFC_DEP_MASK)) { | |
637d85a7 | 212 | cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
eb9bc6e9 | 213 | NCI_NFC_A_PASSIVE_POLL_MODE; |
6a2968aa IE |
214 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
215 | cmd.num_disc_configs++; | |
216 | } | |
217 | ||
218 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | |
01d719a2 | 219 | (protocols & NFC_PROTO_ISO14443_B_MASK)) { |
637d85a7 | 220 | cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
eb9bc6e9 | 221 | NCI_NFC_B_PASSIVE_POLL_MODE; |
6a2968aa IE |
222 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
223 | cmd.num_disc_configs++; | |
224 | } | |
225 | ||
226 | if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) && | |
874934f4 SJ |
227 | (protocols & NFC_PROTO_FELICA_MASK || |
228 | protocols & NFC_PROTO_NFC_DEP_MASK)) { | |
637d85a7 | 229 | cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode = |
eb9bc6e9 | 230 | NCI_NFC_F_PASSIVE_POLL_MODE; |
6a2968aa IE |
231 | cmd.disc_configs[cmd.num_disc_configs].frequency = 1; |
232 | cmd.num_disc_configs++; | |
233 | } | |
234 | ||
235 | nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD, | |
eb9bc6e9 SO |
236 | (1 + (cmd.num_disc_configs * sizeof(struct disc_config))), |
237 | &cmd); | |
6a2968aa IE |
238 | } |
239 | ||
019c4fba IE |
240 | struct nci_rf_discover_select_param { |
241 | __u8 rf_discovery_id; | |
242 | __u8 rf_protocol; | |
243 | }; | |
244 | ||
245 | static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt) | |
246 | { | |
247 | struct nci_rf_discover_select_param *param = | |
eb9bc6e9 | 248 | (struct nci_rf_discover_select_param *)opt; |
019c4fba IE |
249 | struct nci_rf_discover_select_cmd cmd; |
250 | ||
251 | cmd.rf_discovery_id = param->rf_discovery_id; | |
252 | cmd.rf_protocol = param->rf_protocol; | |
253 | ||
254 | switch (cmd.rf_protocol) { | |
255 | case NCI_RF_PROTOCOL_ISO_DEP: | |
256 | cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP; | |
257 | break; | |
258 | ||
259 | case NCI_RF_PROTOCOL_NFC_DEP: | |
260 | cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP; | |
261 | break; | |
262 | ||
263 | default: | |
264 | cmd.rf_interface = NCI_RF_INTERFACE_FRAME; | |
265 | break; | |
266 | } | |
267 | ||
268 | nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD, | |
eb9bc6e9 | 269 | sizeof(struct nci_rf_discover_select_cmd), &cmd); |
019c4fba IE |
270 | } |
271 | ||
6a2968aa IE |
272 | static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt) |
273 | { | |
274 | struct nci_rf_deactivate_cmd cmd; | |
275 | ||
276 | cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE; | |
277 | ||
278 | nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD, | |
eb9bc6e9 | 279 | sizeof(struct nci_rf_deactivate_cmd), &cmd); |
6a2968aa IE |
280 | } |
281 | ||
282 | static int nci_open_device(struct nci_dev *ndev) | |
283 | { | |
284 | int rc = 0; | |
285 | ||
286 | mutex_lock(&ndev->req_lock); | |
287 | ||
288 | if (test_bit(NCI_UP, &ndev->flags)) { | |
289 | rc = -EALREADY; | |
290 | goto done; | |
291 | } | |
292 | ||
293 | if (ndev->ops->open(ndev)) { | |
294 | rc = -EIO; | |
295 | goto done; | |
296 | } | |
297 | ||
298 | atomic_set(&ndev->cmd_cnt, 1); | |
299 | ||
300 | set_bit(NCI_INIT, &ndev->flags); | |
301 | ||
302 | rc = __nci_request(ndev, nci_reset_req, 0, | |
eb9bc6e9 | 303 | msecs_to_jiffies(NCI_RESET_TIMEOUT)); |
6a2968aa IE |
304 | |
305 | if (!rc) { | |
306 | rc = __nci_request(ndev, nci_init_req, 0, | |
eb9bc6e9 | 307 | msecs_to_jiffies(NCI_INIT_TIMEOUT)); |
6a2968aa IE |
308 | } |
309 | ||
310 | if (!rc) { | |
311 | rc = __nci_request(ndev, nci_init_complete_req, 0, | |
eb9bc6e9 | 312 | msecs_to_jiffies(NCI_INIT_TIMEOUT)); |
6a2968aa IE |
313 | } |
314 | ||
315 | clear_bit(NCI_INIT, &ndev->flags); | |
316 | ||
317 | if (!rc) { | |
318 | set_bit(NCI_UP, &ndev->flags); | |
019c4fba | 319 | nci_clear_target_list(ndev); |
8939e47f | 320 | atomic_set(&ndev->state, NCI_IDLE); |
6a2968aa IE |
321 | } else { |
322 | /* Init failed, cleanup */ | |
323 | skb_queue_purge(&ndev->cmd_q); | |
324 | skb_queue_purge(&ndev->rx_q); | |
325 | skb_queue_purge(&ndev->tx_q); | |
326 | ||
327 | ndev->ops->close(ndev); | |
328 | ndev->flags = 0; | |
329 | } | |
330 | ||
331 | done: | |
332 | mutex_unlock(&ndev->req_lock); | |
333 | return rc; | |
334 | } | |
335 | ||
336 | static int nci_close_device(struct nci_dev *ndev) | |
337 | { | |
338 | nci_req_cancel(ndev, ENODEV); | |
339 | mutex_lock(&ndev->req_lock); | |
340 | ||
341 | if (!test_and_clear_bit(NCI_UP, &ndev->flags)) { | |
342 | del_timer_sync(&ndev->cmd_timer); | |
c4bf98b2 | 343 | del_timer_sync(&ndev->data_timer); |
6a2968aa IE |
344 | mutex_unlock(&ndev->req_lock); |
345 | return 0; | |
346 | } | |
347 | ||
348 | /* Drop RX and TX queues */ | |
349 | skb_queue_purge(&ndev->rx_q); | |
350 | skb_queue_purge(&ndev->tx_q); | |
351 | ||
352 | /* Flush RX and TX wq */ | |
353 | flush_workqueue(ndev->rx_wq); | |
354 | flush_workqueue(ndev->tx_wq); | |
355 | ||
356 | /* Reset device */ | |
357 | skb_queue_purge(&ndev->cmd_q); | |
358 | atomic_set(&ndev->cmd_cnt, 1); | |
359 | ||
360 | set_bit(NCI_INIT, &ndev->flags); | |
361 | __nci_request(ndev, nci_reset_req, 0, | |
eb9bc6e9 | 362 | msecs_to_jiffies(NCI_RESET_TIMEOUT)); |
6a2968aa IE |
363 | clear_bit(NCI_INIT, &ndev->flags); |
364 | ||
365 | /* Flush cmd wq */ | |
366 | flush_workqueue(ndev->cmd_wq); | |
367 | ||
368 | /* After this point our queues are empty | |
369 | * and no works are scheduled. */ | |
370 | ndev->ops->close(ndev); | |
371 | ||
372 | /* Clear flags */ | |
373 | ndev->flags = 0; | |
374 | ||
375 | mutex_unlock(&ndev->req_lock); | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | /* NCI command timer function */ | |
381 | static void nci_cmd_timer(unsigned long arg) | |
382 | { | |
383 | struct nci_dev *ndev = (void *) arg; | |
384 | ||
6a2968aa IE |
385 | atomic_set(&ndev->cmd_cnt, 1); |
386 | queue_work(ndev->cmd_wq, &ndev->cmd_work); | |
387 | } | |
388 | ||
c4bf98b2 IE |
389 | /* NCI data exchange timer function */ |
390 | static void nci_data_timer(unsigned long arg) | |
391 | { | |
392 | struct nci_dev *ndev = (void *) arg; | |
393 | ||
394 | set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); | |
395 | queue_work(ndev->rx_wq, &ndev->rx_work); | |
396 | } | |
397 | ||
6a2968aa IE |
398 | static int nci_dev_up(struct nfc_dev *nfc_dev) |
399 | { | |
400 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
401 | ||
6a2968aa IE |
402 | return nci_open_device(ndev); |
403 | } | |
404 | ||
405 | static int nci_dev_down(struct nfc_dev *nfc_dev) | |
406 | { | |
407 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
408 | ||
6a2968aa IE |
409 | return nci_close_device(ndev); |
410 | } | |
411 | ||
7e035230 IE |
412 | static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev) |
413 | { | |
414 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
415 | struct nci_set_config_param param; | |
416 | __u8 local_gb[NFC_MAX_GT_LEN]; | |
f9fc36f4 | 417 | int i; |
7e035230 IE |
418 | |
419 | param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len); | |
420 | if ((param.val == NULL) || (param.len == 0)) | |
f9fc36f4 | 421 | return 0; |
7e035230 | 422 | |
460d8f97 | 423 | if (param.len > NFC_MAX_GT_LEN) |
7e035230 IE |
424 | return -EINVAL; |
425 | ||
426 | for (i = 0; i < param.len; i++) | |
427 | local_gb[param.len-1-i] = param.val[i]; | |
428 | ||
429 | param.id = NCI_PN_ATR_REQ_GEN_BYTES; | |
430 | param.val = local_gb; | |
431 | ||
f9fc36f4 SJ |
432 | return nci_request(ndev, nci_set_config_req, (unsigned long)¶m, |
433 | msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT)); | |
7e035230 IE |
434 | } |
435 | ||
fe7c5800 SO |
436 | static int nci_start_poll(struct nfc_dev *nfc_dev, |
437 | __u32 im_protocols, __u32 tm_protocols) | |
6a2968aa IE |
438 | { |
439 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
440 | int rc; | |
441 | ||
019c4fba | 442 | if ((atomic_read(&ndev->state) == NCI_DISCOVERY) || |
eb9bc6e9 | 443 | (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) { |
ed1e0ad8 | 444 | pr_err("unable to start poll, since poll is already active\n"); |
6a2968aa IE |
445 | return -EBUSY; |
446 | } | |
447 | ||
de054799 | 448 | if (ndev->target_active_prot) { |
ed1e0ad8 | 449 | pr_err("there is an active target\n"); |
de054799 IE |
450 | return -EBUSY; |
451 | } | |
452 | ||
019c4fba | 453 | if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) || |
eb9bc6e9 | 454 | (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) { |
019c4fba | 455 | pr_debug("target active or w4 select, implicitly deactivate\n"); |
6a2968aa IE |
456 | |
457 | rc = nci_request(ndev, nci_rf_deactivate_req, 0, | |
eb9bc6e9 | 458 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); |
6a2968aa IE |
459 | if (rc) |
460 | return -EBUSY; | |
461 | } | |
462 | ||
7e035230 IE |
463 | if (im_protocols & NFC_PROTO_NFC_DEP_MASK) { |
464 | rc = nci_set_local_general_bytes(nfc_dev); | |
465 | if (rc) { | |
466 | pr_err("failed to set local general bytes\n"); | |
467 | return rc; | |
468 | } | |
469 | } | |
470 | ||
fe7c5800 | 471 | rc = nci_request(ndev, nci_rf_discover_req, im_protocols, |
eb9bc6e9 | 472 | msecs_to_jiffies(NCI_RF_DISC_TIMEOUT)); |
6a2968aa IE |
473 | |
474 | if (!rc) | |
fe7c5800 | 475 | ndev->poll_prots = im_protocols; |
6a2968aa IE |
476 | |
477 | return rc; | |
478 | } | |
479 | ||
480 | static void nci_stop_poll(struct nfc_dev *nfc_dev) | |
481 | { | |
482 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
483 | ||
019c4fba | 484 | if ((atomic_read(&ndev->state) != NCI_DISCOVERY) && |
eb9bc6e9 | 485 | (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) { |
ed1e0ad8 | 486 | pr_err("unable to stop poll, since poll is not active\n"); |
6a2968aa IE |
487 | return; |
488 | } | |
489 | ||
490 | nci_request(ndev, nci_rf_deactivate_req, 0, | |
eb9bc6e9 | 491 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); |
6a2968aa IE |
492 | } |
493 | ||
90099433 EL |
494 | static int nci_activate_target(struct nfc_dev *nfc_dev, |
495 | struct nfc_target *target, __u32 protocol) | |
6a2968aa IE |
496 | { |
497 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
019c4fba | 498 | struct nci_rf_discover_select_param param; |
90099433 | 499 | struct nfc_target *nci_target = NULL; |
019c4fba IE |
500 | int i; |
501 | int rc = 0; | |
6a2968aa | 502 | |
90099433 | 503 | pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol); |
6a2968aa | 504 | |
019c4fba | 505 | if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) && |
eb9bc6e9 | 506 | (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) { |
ed1e0ad8 | 507 | pr_err("there is no available target to activate\n"); |
6a2968aa IE |
508 | return -EINVAL; |
509 | } | |
510 | ||
511 | if (ndev->target_active_prot) { | |
ed1e0ad8 | 512 | pr_err("there is already an active target\n"); |
6a2968aa IE |
513 | return -EBUSY; |
514 | } | |
515 | ||
019c4fba | 516 | for (i = 0; i < ndev->n_targets; i++) { |
90099433 EL |
517 | if (ndev->targets[i].idx == target->idx) { |
518 | nci_target = &ndev->targets[i]; | |
019c4fba IE |
519 | break; |
520 | } | |
521 | } | |
522 | ||
90099433 | 523 | if (!nci_target) { |
019c4fba IE |
524 | pr_err("unable to find the selected target\n"); |
525 | return -EINVAL; | |
526 | } | |
527 | ||
90099433 | 528 | if (!(nci_target->supported_protocols & (1 << protocol))) { |
ed1e0ad8 JP |
529 | pr_err("target does not support the requested protocol 0x%x\n", |
530 | protocol); | |
6a2968aa IE |
531 | return -EINVAL; |
532 | } | |
533 | ||
019c4fba | 534 | if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) { |
90099433 | 535 | param.rf_discovery_id = nci_target->logical_idx; |
019c4fba IE |
536 | |
537 | if (protocol == NFC_PROTO_JEWEL) | |
538 | param.rf_protocol = NCI_RF_PROTOCOL_T1T; | |
539 | else if (protocol == NFC_PROTO_MIFARE) | |
540 | param.rf_protocol = NCI_RF_PROTOCOL_T2T; | |
541 | else if (protocol == NFC_PROTO_FELICA) | |
542 | param.rf_protocol = NCI_RF_PROTOCOL_T3T; | |
01d719a2 SO |
543 | else if (protocol == NFC_PROTO_ISO14443 || |
544 | protocol == NFC_PROTO_ISO14443_B) | |
019c4fba IE |
545 | param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP; |
546 | else | |
547 | param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP; | |
548 | ||
549 | rc = nci_request(ndev, nci_rf_discover_select_req, | |
eb9bc6e9 SO |
550 | (unsigned long)¶m, |
551 | msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT)); | |
019c4fba | 552 | } |
6a2968aa | 553 | |
019c4fba IE |
554 | if (!rc) |
555 | ndev->target_active_prot = protocol; | |
556 | ||
557 | return rc; | |
6a2968aa IE |
558 | } |
559 | ||
90099433 EL |
560 | static void nci_deactivate_target(struct nfc_dev *nfc_dev, |
561 | struct nfc_target *target) | |
6a2968aa IE |
562 | { |
563 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
564 | ||
767f19ae | 565 | pr_debug("entry\n"); |
6a2968aa IE |
566 | |
567 | if (!ndev->target_active_prot) { | |
ed1e0ad8 | 568 | pr_err("unable to deactivate target, no active target\n"); |
6a2968aa IE |
569 | return; |
570 | } | |
571 | ||
572 | ndev->target_active_prot = 0; | |
573 | ||
8939e47f | 574 | if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) { |
6a2968aa | 575 | nci_request(ndev, nci_rf_deactivate_req, 0, |
eb9bc6e9 | 576 | msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT)); |
6a2968aa IE |
577 | } |
578 | } | |
579 | ||
767f19ae IE |
580 | static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, |
581 | __u8 comm_mode, __u8 *gb, size_t gb_len) | |
582 | { | |
583 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
584 | int rc; | |
585 | ||
586 | pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode); | |
587 | ||
588 | rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP); | |
589 | if (rc) | |
590 | return rc; | |
591 | ||
592 | rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb, | |
593 | ndev->remote_gb_len); | |
594 | if (!rc) | |
595 | rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE, | |
596 | NFC_RF_INITIATOR); | |
597 | ||
598 | return rc; | |
599 | } | |
600 | ||
601 | static int nci_dep_link_down(struct nfc_dev *nfc_dev) | |
602 | { | |
603 | pr_debug("entry\n"); | |
604 | ||
605 | nci_deactivate_target(nfc_dev, NULL); | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
610 | ||
be9ae4ce SO |
611 | static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, |
612 | struct sk_buff *skb, | |
613 | data_exchange_cb_t cb, void *cb_context) | |
6a2968aa IE |
614 | { |
615 | struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); | |
38f04c6b | 616 | int rc; |
6a2968aa | 617 | |
90099433 | 618 | pr_debug("target_idx %d, len %d\n", target->idx, skb->len); |
6a2968aa IE |
619 | |
620 | if (!ndev->target_active_prot) { | |
ed1e0ad8 | 621 | pr_err("unable to exchange data, no active target\n"); |
6a2968aa IE |
622 | return -EINVAL; |
623 | } | |
624 | ||
38f04c6b IE |
625 | if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) |
626 | return -EBUSY; | |
627 | ||
6a2968aa IE |
628 | /* store cb and context to be used on receiving data */ |
629 | ndev->data_exchange_cb = cb; | |
630 | ndev->data_exchange_cb_context = cb_context; | |
631 | ||
e8c0dacd | 632 | rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb); |
38f04c6b IE |
633 | if (rc) |
634 | clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); | |
635 | ||
636 | return rc; | |
6a2968aa IE |
637 | } |
638 | ||
0a946301 SO |
639 | static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx) |
640 | { | |
641 | return 0; | |
642 | } | |
643 | ||
644 | static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx) | |
645 | { | |
646 | return 0; | |
647 | } | |
648 | ||
649 | static int nci_discover_se(struct nfc_dev *nfc_dev) | |
650 | { | |
651 | return 0; | |
652 | } | |
653 | ||
6a2968aa IE |
654 | static struct nfc_ops nci_nfc_ops = { |
655 | .dev_up = nci_dev_up, | |
656 | .dev_down = nci_dev_down, | |
657 | .start_poll = nci_start_poll, | |
658 | .stop_poll = nci_stop_poll, | |
767f19ae IE |
659 | .dep_link_up = nci_dep_link_up, |
660 | .dep_link_down = nci_dep_link_down, | |
6a2968aa IE |
661 | .activate_target = nci_activate_target, |
662 | .deactivate_target = nci_deactivate_target, | |
be9ae4ce | 663 | .im_transceive = nci_transceive, |
0a946301 SO |
664 | .enable_se = nci_enable_se, |
665 | .disable_se = nci_disable_se, | |
666 | .discover_se = nci_discover_se, | |
6a2968aa IE |
667 | }; |
668 | ||
669 | /* ---- Interface to NCI drivers ---- */ | |
670 | ||
671 | /** | |
672 | * nci_allocate_device - allocate a new nci device | |
673 | * | |
674 | * @ops: device operations | |
675 | * @supported_protocols: NFC protocols supported by the device | |
676 | */ | |
677 | struct nci_dev *nci_allocate_device(struct nci_ops *ops, | |
eb9bc6e9 SO |
678 | __u32 supported_protocols, |
679 | int tx_headroom, int tx_tailroom) | |
6a2968aa | 680 | { |
8ebafde0 | 681 | struct nci_dev *ndev; |
6a2968aa | 682 | |
24bf3304 | 683 | pr_debug("supported_protocols 0x%x\n", supported_protocols); |
6a2968aa IE |
684 | |
685 | if (!ops->open || !ops->close || !ops->send) | |
8ebafde0 | 686 | return NULL; |
6a2968aa IE |
687 | |
688 | if (!supported_protocols) | |
8ebafde0 | 689 | return NULL; |
6a2968aa IE |
690 | |
691 | ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); | |
692 | if (!ndev) | |
8ebafde0 | 693 | return NULL; |
6a2968aa IE |
694 | |
695 | ndev->ops = ops; | |
696 | ndev->tx_headroom = tx_headroom; | |
697 | ndev->tx_tailroom = tx_tailroom; | |
698 | ||
699 | ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops, | |
eb9bc6e9 SO |
700 | supported_protocols, |
701 | tx_headroom + NCI_DATA_HDR_SIZE, | |
702 | tx_tailroom); | |
6a2968aa IE |
703 | if (!ndev->nfc_dev) |
704 | goto free_exit; | |
705 | ||
706 | nfc_set_drvdata(ndev->nfc_dev, ndev); | |
707 | ||
8ebafde0 | 708 | return ndev; |
6a2968aa IE |
709 | |
710 | free_exit: | |
711 | kfree(ndev); | |
8ebafde0 | 712 | return NULL; |
6a2968aa IE |
713 | } |
714 | EXPORT_SYMBOL(nci_allocate_device); | |
715 | ||
716 | /** | |
717 | * nci_free_device - deallocate nci device | |
718 | * | |
719 | * @ndev: The nci device to deallocate | |
720 | */ | |
721 | void nci_free_device(struct nci_dev *ndev) | |
722 | { | |
6a2968aa IE |
723 | nfc_free_device(ndev->nfc_dev); |
724 | kfree(ndev); | |
725 | } | |
726 | EXPORT_SYMBOL(nci_free_device); | |
727 | ||
728 | /** | |
729 | * nci_register_device - register a nci device in the nfc subsystem | |
730 | * | |
731 | * @dev: The nci device to register | |
732 | */ | |
733 | int nci_register_device(struct nci_dev *ndev) | |
734 | { | |
735 | int rc; | |
736 | struct device *dev = &ndev->nfc_dev->dev; | |
737 | char name[32]; | |
738 | ||
6a2968aa IE |
739 | rc = nfc_register_device(ndev->nfc_dev); |
740 | if (rc) | |
741 | goto exit; | |
742 | ||
743 | ndev->flags = 0; | |
744 | ||
745 | INIT_WORK(&ndev->cmd_work, nci_cmd_work); | |
746 | snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev)); | |
747 | ndev->cmd_wq = create_singlethread_workqueue(name); | |
748 | if (!ndev->cmd_wq) { | |
749 | rc = -ENOMEM; | |
750 | goto unreg_exit; | |
751 | } | |
752 | ||
753 | INIT_WORK(&ndev->rx_work, nci_rx_work); | |
754 | snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev)); | |
755 | ndev->rx_wq = create_singlethread_workqueue(name); | |
756 | if (!ndev->rx_wq) { | |
757 | rc = -ENOMEM; | |
758 | goto destroy_cmd_wq_exit; | |
759 | } | |
760 | ||
761 | INIT_WORK(&ndev->tx_work, nci_tx_work); | |
762 | snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev)); | |
763 | ndev->tx_wq = create_singlethread_workqueue(name); | |
764 | if (!ndev->tx_wq) { | |
765 | rc = -ENOMEM; | |
766 | goto destroy_rx_wq_exit; | |
767 | } | |
768 | ||
769 | skb_queue_head_init(&ndev->cmd_q); | |
770 | skb_queue_head_init(&ndev->rx_q); | |
771 | skb_queue_head_init(&ndev->tx_q); | |
772 | ||
773 | setup_timer(&ndev->cmd_timer, nci_cmd_timer, | |
eb9bc6e9 | 774 | (unsigned long) ndev); |
c4bf98b2 | 775 | setup_timer(&ndev->data_timer, nci_data_timer, |
eb9bc6e9 | 776 | (unsigned long) ndev); |
6a2968aa IE |
777 | |
778 | mutex_init(&ndev->req_lock); | |
779 | ||
780 | goto exit; | |
781 | ||
782 | destroy_rx_wq_exit: | |
783 | destroy_workqueue(ndev->rx_wq); | |
784 | ||
785 | destroy_cmd_wq_exit: | |
786 | destroy_workqueue(ndev->cmd_wq); | |
787 | ||
788 | unreg_exit: | |
789 | nfc_unregister_device(ndev->nfc_dev); | |
790 | ||
791 | exit: | |
792 | return rc; | |
793 | } | |
794 | EXPORT_SYMBOL(nci_register_device); | |
795 | ||
796 | /** | |
797 | * nci_unregister_device - unregister a nci device in the nfc subsystem | |
798 | * | |
799 | * @dev: The nci device to unregister | |
800 | */ | |
801 | void nci_unregister_device(struct nci_dev *ndev) | |
802 | { | |
6a2968aa IE |
803 | nci_close_device(ndev); |
804 | ||
805 | destroy_workqueue(ndev->cmd_wq); | |
806 | destroy_workqueue(ndev->rx_wq); | |
807 | destroy_workqueue(ndev->tx_wq); | |
808 | ||
809 | nfc_unregister_device(ndev->nfc_dev); | |
810 | } | |
811 | EXPORT_SYMBOL(nci_unregister_device); | |
812 | ||
813 | /** | |
814 | * nci_recv_frame - receive frame from NCI drivers | |
815 | * | |
1095e69f | 816 | * @ndev: The nci device |
6a2968aa IE |
817 | * @skb: The sk_buff to receive |
818 | */ | |
1095e69f | 819 | int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb) |
6a2968aa | 820 | { |
24bf3304 | 821 | pr_debug("len %d\n", skb->len); |
6a2968aa | 822 | |
874934f4 SJ |
823 | if (!ndev || (!test_bit(NCI_UP, &ndev->flags) && |
824 | !test_bit(NCI_INIT, &ndev->flags))) { | |
6a2968aa IE |
825 | kfree_skb(skb); |
826 | return -ENXIO; | |
827 | } | |
828 | ||
829 | /* Queue frame for rx worker thread */ | |
830 | skb_queue_tail(&ndev->rx_q, skb); | |
831 | queue_work(ndev->rx_wq, &ndev->rx_work); | |
832 | ||
833 | return 0; | |
834 | } | |
835 | EXPORT_SYMBOL(nci_recv_frame); | |
836 | ||
1095e69f | 837 | static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb) |
6a2968aa | 838 | { |
24bf3304 | 839 | pr_debug("len %d\n", skb->len); |
6a2968aa IE |
840 | |
841 | if (!ndev) { | |
842 | kfree_skb(skb); | |
843 | return -ENODEV; | |
844 | } | |
845 | ||
846 | /* Get rid of skb owner, prior to sending to the driver. */ | |
847 | skb_orphan(skb); | |
848 | ||
1095e69f | 849 | return ndev->ops->send(ndev, skb); |
6a2968aa IE |
850 | } |
851 | ||
852 | /* Send NCI command */ | |
853 | int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload) | |
854 | { | |
855 | struct nci_ctrl_hdr *hdr; | |
856 | struct sk_buff *skb; | |
857 | ||
24bf3304 | 858 | pr_debug("opcode 0x%x, plen %d\n", opcode, plen); |
6a2968aa IE |
859 | |
860 | skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL); | |
861 | if (!skb) { | |
ed1e0ad8 | 862 | pr_err("no memory for command\n"); |
6a2968aa IE |
863 | return -ENOMEM; |
864 | } | |
865 | ||
866 | hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE); | |
867 | hdr->gid = nci_opcode_gid(opcode); | |
868 | hdr->oid = nci_opcode_oid(opcode); | |
869 | hdr->plen = plen; | |
870 | ||
871 | nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT); | |
872 | nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST); | |
873 | ||
874 | if (plen) | |
875 | memcpy(skb_put(skb, plen), payload, plen); | |
876 | ||
6a2968aa IE |
877 | skb_queue_tail(&ndev->cmd_q, skb); |
878 | queue_work(ndev->cmd_wq, &ndev->cmd_work); | |
879 | ||
880 | return 0; | |
881 | } | |
882 | ||
883 | /* ---- NCI TX Data worker thread ---- */ | |
884 | ||
885 | static void nci_tx_work(struct work_struct *work) | |
886 | { | |
887 | struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work); | |
888 | struct sk_buff *skb; | |
889 | ||
24bf3304 | 890 | pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt)); |
6a2968aa IE |
891 | |
892 | /* Send queued tx data */ | |
893 | while (atomic_read(&ndev->credits_cnt)) { | |
894 | skb = skb_dequeue(&ndev->tx_q); | |
895 | if (!skb) | |
896 | return; | |
897 | ||
db98c829 IE |
898 | /* Check if data flow control is used */ |
899 | if (atomic_read(&ndev->credits_cnt) != | |
eb9bc6e9 | 900 | NCI_DATA_FLOW_CONTROL_NOT_USED) |
db98c829 | 901 | atomic_dec(&ndev->credits_cnt); |
6a2968aa | 902 | |
20c239c1 JP |
903 | pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", |
904 | nci_pbf(skb->data), | |
905 | nci_conn_id(skb->data), | |
906 | nci_plen(skb->data)); | |
6a2968aa | 907 | |
1095e69f | 908 | nci_send_frame(ndev, skb); |
c4bf98b2 IE |
909 | |
910 | mod_timer(&ndev->data_timer, | |
eb9bc6e9 | 911 | jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT)); |
6a2968aa IE |
912 | } |
913 | } | |
914 | ||
915 | /* ----- NCI RX worker thread (data & control) ----- */ | |
916 | ||
917 | static void nci_rx_work(struct work_struct *work) | |
918 | { | |
919 | struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work); | |
920 | struct sk_buff *skb; | |
921 | ||
922 | while ((skb = skb_dequeue(&ndev->rx_q))) { | |
923 | /* Process frame */ | |
924 | switch (nci_mt(skb->data)) { | |
925 | case NCI_MT_RSP_PKT: | |
926 | nci_rsp_packet(ndev, skb); | |
927 | break; | |
928 | ||
929 | case NCI_MT_NTF_PKT: | |
930 | nci_ntf_packet(ndev, skb); | |
931 | break; | |
932 | ||
933 | case NCI_MT_DATA_PKT: | |
934 | nci_rx_data_packet(ndev, skb); | |
935 | break; | |
936 | ||
937 | default: | |
ed1e0ad8 | 938 | pr_err("unknown MT 0x%x\n", nci_mt(skb->data)); |
6a2968aa IE |
939 | kfree_skb(skb); |
940 | break; | |
941 | } | |
942 | } | |
c4bf98b2 IE |
943 | |
944 | /* check if a data exchange timout has occurred */ | |
945 | if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) { | |
946 | /* complete the data exchange transaction, if exists */ | |
947 | if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags)) | |
948 | nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT); | |
949 | ||
950 | clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); | |
951 | } | |
6a2968aa IE |
952 | } |
953 | ||
954 | /* ----- NCI TX CMD worker thread ----- */ | |
955 | ||
956 | static void nci_cmd_work(struct work_struct *work) | |
957 | { | |
958 | struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work); | |
959 | struct sk_buff *skb; | |
960 | ||
24bf3304 | 961 | pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt)); |
6a2968aa IE |
962 | |
963 | /* Send queued command */ | |
964 | if (atomic_read(&ndev->cmd_cnt)) { | |
965 | skb = skb_dequeue(&ndev->cmd_q); | |
966 | if (!skb) | |
967 | return; | |
968 | ||
969 | atomic_dec(&ndev->cmd_cnt); | |
970 | ||
20c239c1 JP |
971 | pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n", |
972 | nci_pbf(skb->data), | |
973 | nci_opcode_gid(nci_opcode(skb->data)), | |
974 | nci_opcode_oid(nci_opcode(skb->data)), | |
975 | nci_plen(skb->data)); | |
6a2968aa | 976 | |
1095e69f | 977 | nci_send_frame(ndev, skb); |
6a2968aa IE |
978 | |
979 | mod_timer(&ndev->cmd_timer, | |
eb9bc6e9 | 980 | jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT)); |
6a2968aa IE |
981 | } |
982 | } | |
8a70e7f8 DJ |
983 | |
984 | MODULE_LICENSE("GPL"); |