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btrfs: account for non-CoW'd blocks in btrfs_abort_transaction
[linux/fpc-iii.git] / net / nfc / nci / core.c
blob49ff321060809a320966d5efc24ea6aaaab1add8
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 * Copyright (C) 2014 Marvell International Ltd.
7 *
8 * Written by Ilan Elias <ilane@ti.com>
9 *
10 * Acknowledgements:
11 * This file is based on hci_core.c, which was written
12 * by Maxim Krasnyansky.
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2
16 * as published by the Free Software Foundation
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, see <http://www.gnu.org/licenses/>.
25 *
26 */
27
28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
29
30 #include <linux/module.h>
31 #include <linux/types.h>
32 #include <linux/workqueue.h>
33 #include <linux/completion.h>
34 #include <linux/export.h>
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 struct core_conn_create_data {
45 int length;
46 struct nci_core_conn_create_cmd *cmd;
47 };
48
49 static void nci_cmd_work(struct work_struct *work);
50 static void nci_rx_work(struct work_struct *work);
51 static void nci_tx_work(struct work_struct *work);
52
53 struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev,
54 int conn_id)
55 {
56 struct nci_conn_info *conn_info;
57
58 list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
59 if (conn_info->conn_id == conn_id)
60 return conn_info;
61 }
62
63 return NULL;
64 }
65
66 /* ---- NCI requests ---- */
67
68 void nci_req_complete(struct nci_dev *ndev, int result)
69 {
70 if (ndev->req_status == NCI_REQ_PEND) {
71 ndev->req_result = result;
72 ndev->req_status = NCI_REQ_DONE;
73 complete(&ndev->req_completion);
74 }
75 }
76
77 static void nci_req_cancel(struct nci_dev *ndev, int err)
78 {
79 if (ndev->req_status == NCI_REQ_PEND) {
80 ndev->req_result = err;
81 ndev->req_status = NCI_REQ_CANCELED;
82 complete(&ndev->req_completion);
83 }
84 }
85
86 /* Execute request and wait for completion. */
87 static int __nci_request(struct nci_dev *ndev,
88 void (*req)(struct nci_dev *ndev, unsigned long opt),
89 unsigned long opt, __u32 timeout)
90 {
91 int rc = 0;
92 long completion_rc;
93
94 ndev->req_status = NCI_REQ_PEND;
95
96 reinit_completion(&ndev->req_completion);
97 req(ndev, opt);
98 completion_rc =
99 wait_for_completion_interruptible_timeout(&ndev->req_completion,
100 timeout);
101
102 pr_debug("wait_for_completion return %ld\n", completion_rc);
103
104 if (completion_rc > 0) {
105 switch (ndev->req_status) {
106 case NCI_REQ_DONE:
107 rc = nci_to_errno(ndev->req_result);
108 break;
109
110 case NCI_REQ_CANCELED:
111 rc = -ndev->req_result;
112 break;
113
114 default:
115 rc = -ETIMEDOUT;
116 break;
117 }
118 } else {
119 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
120 completion_rc);
121
122 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
123 }
124
125 ndev->req_status = ndev->req_result = 0;
126
127 return rc;
128 }
129
130 inline int nci_request(struct nci_dev *ndev,
131 void (*req)(struct nci_dev *ndev,
132 unsigned long opt),
133 unsigned long opt, __u32 timeout)
134 {
135 int rc;
136
137 if (!test_bit(NCI_UP, &ndev->flags))
138 return -ENETDOWN;
139
140 /* Serialize all requests */
141 mutex_lock(&ndev->req_lock);
142 rc = __nci_request(ndev, req, opt, timeout);
143 mutex_unlock(&ndev->req_lock);
144
145 return rc;
146 }
147
148 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
149 {
150 struct nci_core_reset_cmd cmd;
151
152 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
153 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
154 }
155
156 static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
157 {
158 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
159 }
160
161 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
162 {
163 struct nci_rf_disc_map_cmd cmd;
164 struct disc_map_config *cfg = cmd.mapping_configs;
165 __u8 *num = &cmd.num_mapping_configs;
166 int i;
167
168 /* set rf mapping configurations */
169 *num = 0;
170
171 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
172 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
173 if (ndev->supported_rf_interfaces[i] ==
174 NCI_RF_INTERFACE_ISO_DEP) {
175 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
176 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
177 NCI_DISC_MAP_MODE_LISTEN;
178 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
179 (*num)++;
180 } else if (ndev->supported_rf_interfaces[i] ==
181 NCI_RF_INTERFACE_NFC_DEP) {
182 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
183 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
184 NCI_DISC_MAP_MODE_LISTEN;
185 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
186 (*num)++;
187 }
188
189 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
190 break;
191 }
192
193 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
194 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
195 }
196
197 struct nci_set_config_param {
198 __u8 id;
199 size_t len;
200 __u8 *val;
201 };
202
203 static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
204 {
205 struct nci_set_config_param *param = (struct nci_set_config_param *)opt;
206 struct nci_core_set_config_cmd cmd;
207
208 BUG_ON(param->len > NCI_MAX_PARAM_LEN);
209
210 cmd.num_params = 1;
211 cmd.param.id = param->id;
212 cmd.param.len = param->len;
213 memcpy(cmd.param.val, param->val, param->len);
214
215 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
216 }
217
218 struct nci_rf_discover_param {
219 __u32 im_protocols;
220 __u32 tm_protocols;
221 };
222
223 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
224 {
225 struct nci_rf_discover_param *param =
226 (struct nci_rf_discover_param *)opt;
227 struct nci_rf_disc_cmd cmd;
228
229 cmd.num_disc_configs = 0;
230
231 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
232 (param->im_protocols & NFC_PROTO_JEWEL_MASK ||
233 param->im_protocols & NFC_PROTO_MIFARE_MASK ||
234 param->im_protocols & NFC_PROTO_ISO14443_MASK ||
235 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
236 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
237 NCI_NFC_A_PASSIVE_POLL_MODE;
238 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
239 cmd.num_disc_configs++;
240 }
241
242 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
243 (param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) {
244 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
245 NCI_NFC_B_PASSIVE_POLL_MODE;
246 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
247 cmd.num_disc_configs++;
248 }
249
250 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
251 (param->im_protocols & NFC_PROTO_FELICA_MASK ||
252 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
253 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
254 NCI_NFC_F_PASSIVE_POLL_MODE;
255 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
256 cmd.num_disc_configs++;
257 }
258
259 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
260 (param->im_protocols & NFC_PROTO_ISO15693_MASK)) {
261 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
262 NCI_NFC_V_PASSIVE_POLL_MODE;
263 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
264 cmd.num_disc_configs++;
265 }
266
267 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) &&
268 (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) {
269 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
270 NCI_NFC_A_PASSIVE_LISTEN_MODE;
271 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
272 cmd.num_disc_configs++;
273 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
274 NCI_NFC_F_PASSIVE_LISTEN_MODE;
275 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
276 cmd.num_disc_configs++;
277 }
278
279 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
280 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
281 &cmd);
282 }
283
284 struct nci_rf_discover_select_param {
285 __u8 rf_discovery_id;
286 __u8 rf_protocol;
287 };
288
289 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
290 {
291 struct nci_rf_discover_select_param *param =
292 (struct nci_rf_discover_select_param *)opt;
293 struct nci_rf_discover_select_cmd cmd;
294
295 cmd.rf_discovery_id = param->rf_discovery_id;
296 cmd.rf_protocol = param->rf_protocol;
297
298 switch (cmd.rf_protocol) {
299 case NCI_RF_PROTOCOL_ISO_DEP:
300 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
301 break;
302
303 case NCI_RF_PROTOCOL_NFC_DEP:
304 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
305 break;
306
307 default:
308 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
309 break;
310 }
311
312 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
313 sizeof(struct nci_rf_discover_select_cmd), &cmd);
314 }
315
316 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
317 {
318 struct nci_rf_deactivate_cmd cmd;
319
320 cmd.type = opt;
321
322 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
323 sizeof(struct nci_rf_deactivate_cmd), &cmd);
324 }
325
326 static int nci_open_device(struct nci_dev *ndev)
327 {
328 int rc = 0;
329
330 mutex_lock(&ndev->req_lock);
331
332 if (test_bit(NCI_UP, &ndev->flags)) {
333 rc = -EALREADY;
334 goto done;
335 }
336
337 if (ndev->ops->open(ndev)) {
338 rc = -EIO;
339 goto done;
340 }
341
342 atomic_set(&ndev->cmd_cnt, 1);
343
344 set_bit(NCI_INIT, &ndev->flags);
345
346 rc = __nci_request(ndev, nci_reset_req, 0,
347 msecs_to_jiffies(NCI_RESET_TIMEOUT));
348
349 if (ndev->ops->setup)
350 ndev->ops->setup(ndev);
351
352 if (!rc) {
353 rc = __nci_request(ndev, nci_init_req, 0,
354 msecs_to_jiffies(NCI_INIT_TIMEOUT));
355 }
356
357 if (!rc) {
358 rc = __nci_request(ndev, nci_init_complete_req, 0,
359 msecs_to_jiffies(NCI_INIT_TIMEOUT));
360 }
361
362 clear_bit(NCI_INIT, &ndev->flags);
363
364 if (!rc) {
365 set_bit(NCI_UP, &ndev->flags);
366 nci_clear_target_list(ndev);
367 atomic_set(&ndev->state, NCI_IDLE);
368 } else {
369 /* Init failed, cleanup */
370 skb_queue_purge(&ndev->cmd_q);
371 skb_queue_purge(&ndev->rx_q);
372 skb_queue_purge(&ndev->tx_q);
373
374 ndev->ops->close(ndev);
375 ndev->flags = 0;
376 }
377
378 done:
379 mutex_unlock(&ndev->req_lock);
380 return rc;
381 }
382
383 static int nci_close_device(struct nci_dev *ndev)
384 {
385 nci_req_cancel(ndev, ENODEV);
386 mutex_lock(&ndev->req_lock);
387
388 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
389 del_timer_sync(&ndev->cmd_timer);
390 del_timer_sync(&ndev->data_timer);
391 mutex_unlock(&ndev->req_lock);
392 return 0;
393 }
394
395 /* Drop RX and TX queues */
396 skb_queue_purge(&ndev->rx_q);
397 skb_queue_purge(&ndev->tx_q);
398
399 /* Flush RX and TX wq */
400 flush_workqueue(ndev->rx_wq);
401 flush_workqueue(ndev->tx_wq);
402
403 /* Reset device */
404 skb_queue_purge(&ndev->cmd_q);
405 atomic_set(&ndev->cmd_cnt, 1);
406
407 set_bit(NCI_INIT, &ndev->flags);
408 __nci_request(ndev, nci_reset_req, 0,
409 msecs_to_jiffies(NCI_RESET_TIMEOUT));
410 clear_bit(NCI_INIT, &ndev->flags);
411
412 del_timer_sync(&ndev->cmd_timer);
413
414 /* Flush cmd wq */
415 flush_workqueue(ndev->cmd_wq);
416
417 /* After this point our queues are empty
418 * and no works are scheduled. */
419 ndev->ops->close(ndev);
420
421 /* Clear flags */
422 ndev->flags = 0;
423
424 mutex_unlock(&ndev->req_lock);
425
426 return 0;
427 }
428
429 /* NCI command timer function */
430 static void nci_cmd_timer(unsigned long arg)
431 {
432 struct nci_dev *ndev = (void *) arg;
433
434 atomic_set(&ndev->cmd_cnt, 1);
435 queue_work(ndev->cmd_wq, &ndev->cmd_work);
436 }
437
438 /* NCI data exchange timer function */
439 static void nci_data_timer(unsigned long arg)
440 {
441 struct nci_dev *ndev = (void *) arg;
442
443 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
444 queue_work(ndev->rx_wq, &ndev->rx_work);
445 }
446
447 static int nci_dev_up(struct nfc_dev *nfc_dev)
448 {
449 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
450
451 return nci_open_device(ndev);
452 }
453
454 static int nci_dev_down(struct nfc_dev *nfc_dev)
455 {
456 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
457
458 return nci_close_device(ndev);
459 }
460
461 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val)
462 {
463 struct nci_set_config_param param;
464
465 if (!val || !len)
466 return 0;
467
468 param.id = id;
469 param.len = len;
470 param.val = val;
471
472 return __nci_request(ndev, nci_set_config_req, (unsigned long)&param,
473 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
474 }
475 EXPORT_SYMBOL(nci_set_config);
476
477 static void nci_nfcee_discover_req(struct nci_dev *ndev, unsigned long opt)
478 {
479 struct nci_nfcee_discover_cmd cmd;
480 __u8 action = opt;
481
482 cmd.discovery_action = action;
483
484 nci_send_cmd(ndev, NCI_OP_NFCEE_DISCOVER_CMD, 1, &cmd);
485 }
486
487 int nci_nfcee_discover(struct nci_dev *ndev, u8 action)
488 {
489 return nci_request(ndev, nci_nfcee_discover_req, action,
490 msecs_to_jiffies(NCI_CMD_TIMEOUT));
491 }
492 EXPORT_SYMBOL(nci_nfcee_discover);
493
494 static void nci_nfcee_mode_set_req(struct nci_dev *ndev, unsigned long opt)
495 {
496 struct nci_nfcee_mode_set_cmd *cmd =
497 (struct nci_nfcee_mode_set_cmd *)opt;
498
499 nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD,
500 sizeof(struct nci_nfcee_mode_set_cmd), cmd);
501 }
502
503 int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode)
504 {
505 struct nci_nfcee_mode_set_cmd cmd;
506
507 cmd.nfcee_id = nfcee_id;
508 cmd.nfcee_mode = nfcee_mode;
509
510 return nci_request(ndev, nci_nfcee_mode_set_req, (unsigned long)&cmd,
511 msecs_to_jiffies(NCI_CMD_TIMEOUT));
512 }
513 EXPORT_SYMBOL(nci_nfcee_mode_set);
514
515 static void nci_core_conn_create_req(struct nci_dev *ndev, unsigned long opt)
516 {
517 struct core_conn_create_data *data =
518 (struct core_conn_create_data *)opt;
519
520 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd);
521 }
522
523 int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
524 u8 number_destination_params,
525 size_t params_len,
526 struct core_conn_create_dest_spec_params *params)
527 {
528 int r;
529 struct nci_core_conn_create_cmd *cmd;
530 struct core_conn_create_data data;
531
532 data.length = params_len + sizeof(struct nci_core_conn_create_cmd);
533 cmd = kzalloc(data.length, GFP_KERNEL);
534 if (!cmd)
535 return -ENOMEM;
536
537 cmd->destination_type = destination_type;
538 cmd->number_destination_params = number_destination_params;
539 memcpy(cmd->params, params, params_len);
540
541 data.cmd = cmd;
542 ndev->cur_id = params->value[DEST_SPEC_PARAMS_ID_INDEX];
543
544 r = __nci_request(ndev, nci_core_conn_create_req,
545 (unsigned long)&data,
546 msecs_to_jiffies(NCI_CMD_TIMEOUT));
547 kfree(cmd);
548 return r;
549 }
550 EXPORT_SYMBOL(nci_core_conn_create);
551
552 static void nci_core_conn_close_req(struct nci_dev *ndev, unsigned long opt)
553 {
554 __u8 conn_id = opt;
555
556 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id);
557 }
558
559 int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id)
560 {
561 return nci_request(ndev, nci_core_conn_close_req, conn_id,
562 msecs_to_jiffies(NCI_CMD_TIMEOUT));
563 }
564 EXPORT_SYMBOL(nci_core_conn_close);
565
566 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
567 {
568 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
569 struct nci_set_config_param param;
570 int rc;
571
572 param.val = nfc_get_local_general_bytes(nfc_dev, &param.len);
573 if ((param.val == NULL) || (param.len == 0))
574 return 0;
575
576 if (param.len > NFC_MAX_GT_LEN)
577 return -EINVAL;
578
579 param.id = NCI_PN_ATR_REQ_GEN_BYTES;
580
581 rc = nci_request(ndev, nci_set_config_req, (unsigned long)&param,
582 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
583 if (rc)
584 return rc;
585
586 param.id = NCI_LN_ATR_RES_GEN_BYTES;
587
588 return nci_request(ndev, nci_set_config_req, (unsigned long)&param,
589 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
590 }
591
592 static int nci_set_listen_parameters(struct nfc_dev *nfc_dev)
593 {
594 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
595 int rc;
596 __u8 val;
597
598 val = NCI_LA_SEL_INFO_NFC_DEP_MASK;
599
600 rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val);
601 if (rc)
602 return rc;
603
604 val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK;
605
606 rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val);
607 if (rc)
608 return rc;
609
610 val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424;
611
612 return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val);
613 }
614
615 static int nci_start_poll(struct nfc_dev *nfc_dev,
616 __u32 im_protocols, __u32 tm_protocols)
617 {
618 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
619 struct nci_rf_discover_param param;
620 int rc;
621
622 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
623 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
624 pr_err("unable to start poll, since poll is already active\n");
625 return -EBUSY;
626 }
627
628 if (ndev->target_active_prot) {
629 pr_err("there is an active target\n");
630 return -EBUSY;
631 }
632
633 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
634 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
635 pr_debug("target active or w4 select, implicitly deactivate\n");
636
637 rc = nci_request(ndev, nci_rf_deactivate_req,
638 NCI_DEACTIVATE_TYPE_IDLE_MODE,
639 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
640 if (rc)
641 return -EBUSY;
642 }
643
644 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
645 rc = nci_set_local_general_bytes(nfc_dev);
646 if (rc) {
647 pr_err("failed to set local general bytes\n");
648 return rc;
649 }
650 }
651
652 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
653 rc = nci_set_listen_parameters(nfc_dev);
654 if (rc)
655 pr_err("failed to set listen parameters\n");
656 }
657
658 param.im_protocols = im_protocols;
659 param.tm_protocols = tm_protocols;
660 rc = nci_request(ndev, nci_rf_discover_req, (unsigned long)&param,
661 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
662
663 if (!rc)
664 ndev->poll_prots = im_protocols;
665
666 return rc;
667 }
668
669 static void nci_stop_poll(struct nfc_dev *nfc_dev)
670 {
671 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
672
673 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
674 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
675 pr_err("unable to stop poll, since poll is not active\n");
676 return;
677 }
678
679 nci_request(ndev, nci_rf_deactivate_req, NCI_DEACTIVATE_TYPE_IDLE_MODE,
680 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
681 }
682
683 static int nci_activate_target(struct nfc_dev *nfc_dev,
684 struct nfc_target *target, __u32 protocol)
685 {
686 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
687 struct nci_rf_discover_select_param param;
688 struct nfc_target *nci_target = NULL;
689 int i;
690 int rc = 0;
691
692 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
693
694 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
695 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
696 pr_err("there is no available target to activate\n");
697 return -EINVAL;
698 }
699
700 if (ndev->target_active_prot) {
701 pr_err("there is already an active target\n");
702 return -EBUSY;
703 }
704
705 for (i = 0; i < ndev->n_targets; i++) {
706 if (ndev->targets[i].idx == target->idx) {
707 nci_target = &ndev->targets[i];
708 break;
709 }
710 }
711
712 if (!nci_target) {
713 pr_err("unable to find the selected target\n");
714 return -EINVAL;
715 }
716
717 if (!(nci_target->supported_protocols & (1 << protocol))) {
718 pr_err("target does not support the requested protocol 0x%x\n",
719 protocol);
720 return -EINVAL;
721 }
722
723 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
724 param.rf_discovery_id = nci_target->logical_idx;
725
726 if (protocol == NFC_PROTO_JEWEL)
727 param.rf_protocol = NCI_RF_PROTOCOL_T1T;
728 else if (protocol == NFC_PROTO_MIFARE)
729 param.rf_protocol = NCI_RF_PROTOCOL_T2T;
730 else if (protocol == NFC_PROTO_FELICA)
731 param.rf_protocol = NCI_RF_PROTOCOL_T3T;
732 else if (protocol == NFC_PROTO_ISO14443 ||
733 protocol == NFC_PROTO_ISO14443_B)
734 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
735 else
736 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
737
738 rc = nci_request(ndev, nci_rf_discover_select_req,
739 (unsigned long)&param,
740 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
741 }
742
743 if (!rc)
744 ndev->target_active_prot = protocol;
745
746 return rc;
747 }
748
749 static void nci_deactivate_target(struct nfc_dev *nfc_dev,
750 struct nfc_target *target)
751 {
752 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
753
754 pr_debug("entry\n");
755
756 if (!ndev->target_active_prot) {
757 pr_err("unable to deactivate target, no active target\n");
758 return;
759 }
760
761 ndev->target_active_prot = 0;
762
763 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
764 nci_request(ndev, nci_rf_deactivate_req,
765 NCI_DEACTIVATE_TYPE_SLEEP_MODE,
766 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
767 }
768 }
769
770 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
771 __u8 comm_mode, __u8 *gb, size_t gb_len)
772 {
773 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
774 int rc;
775
776 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
777
778 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
779 if (rc)
780 return rc;
781
782 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
783 ndev->remote_gb_len);
784 if (!rc)
785 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
786 NFC_RF_INITIATOR);
787
788 return rc;
789 }
790
791 static int nci_dep_link_down(struct nfc_dev *nfc_dev)
792 {
793 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
794 int rc;
795
796 pr_debug("entry\n");
797
798 if (nfc_dev->rf_mode == NFC_RF_INITIATOR) {
799 nci_deactivate_target(nfc_dev, NULL);
800 } else {
801 if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE ||
802 atomic_read(&ndev->state) == NCI_DISCOVERY) {
803 nci_request(ndev, nci_rf_deactivate_req, 0,
804 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
805 }
806
807 rc = nfc_tm_deactivated(nfc_dev);
808 if (rc)
809 pr_err("error when signaling tm deactivation\n");
810 }
811
812 return 0;
813 }
814
815
816 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
817 struct sk_buff *skb,
818 data_exchange_cb_t cb, void *cb_context)
819 {
820 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
821 int rc;
822 struct nci_conn_info *conn_info;
823
824 conn_info = ndev->rf_conn_info;
825 if (!conn_info)
826 return -EPROTO;
827
828 pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
829
830 if (!ndev->target_active_prot) {
831 pr_err("unable to exchange data, no active target\n");
832 return -EINVAL;
833 }
834
835 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
836 return -EBUSY;
837
838 /* store cb and context to be used on receiving data */
839 conn_info->data_exchange_cb = cb;
840 conn_info->data_exchange_cb_context = cb_context;
841
842 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
843 if (rc)
844 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
845
846 return rc;
847 }
848
849 static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
850 {
851 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
852 int rc;
853
854 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
855 if (rc)
856 pr_err("unable to send data\n");
857
858 return rc;
859 }
860
861 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
862 {
863 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
864
865 if (ndev->ops->enable_se)
866 return ndev->ops->enable_se(ndev, se_idx);
867
868 return 0;
869 }
870
871 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
872 {
873 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
874
875 if (ndev->ops->disable_se)
876 return ndev->ops->disable_se(ndev, se_idx);
877
878 return 0;
879 }
880
881 static int nci_discover_se(struct nfc_dev *nfc_dev)
882 {
883 int r;
884 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
885
886 if (ndev->ops->discover_se) {
887 r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE);
888 if (r != NCI_STATUS_OK)
889 return -EPROTO;
890
891 return ndev->ops->discover_se(ndev);
892 }
893
894 return 0;
895 }
896
897 static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
898 u8 *apdu, size_t apdu_length,
899 se_io_cb_t cb, void *cb_context)
900 {
901 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
902
903 if (ndev->ops->se_io)
904 return ndev->ops->se_io(ndev, se_idx, apdu,
905 apdu_length, cb, cb_context);
906
907 return 0;
908 }
909
910 static int nci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
911 {
912 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
913
914 if (!ndev->ops->fw_download)
915 return -ENOTSUPP;
916
917 return ndev->ops->fw_download(ndev, firmware_name);
918 }
919
920 static struct nfc_ops nci_nfc_ops = {
921 .dev_up = nci_dev_up,
922 .dev_down = nci_dev_down,
923 .start_poll = nci_start_poll,
924 .stop_poll = nci_stop_poll,
925 .dep_link_up = nci_dep_link_up,
926 .dep_link_down = nci_dep_link_down,
927 .activate_target = nci_activate_target,
928 .deactivate_target = nci_deactivate_target,
929 .im_transceive = nci_transceive,
930 .tm_send = nci_tm_send,
931 .enable_se = nci_enable_se,
932 .disable_se = nci_disable_se,
933 .discover_se = nci_discover_se,
934 .se_io = nci_se_io,
935 .fw_download = nci_fw_download,
936 };
937
938 /* ---- Interface to NCI drivers ---- */
939 /**
940 * nci_allocate_device - allocate a new nci device
941 *
942 * @ops: device operations
943 * @supported_protocols: NFC protocols supported by the device
944 */
945 struct nci_dev *nci_allocate_device(struct nci_ops *ops,
946 __u32 supported_protocols,
947 int tx_headroom, int tx_tailroom)
948 {
949 struct nci_dev *ndev;
950
951 pr_debug("supported_protocols 0x%x\n", supported_protocols);
952
953 if (!ops->open || !ops->close || !ops->send)
954 return NULL;
955
956 if (!supported_protocols)
957 return NULL;
958
959 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
960 if (!ndev)
961 return NULL;
962
963 ndev->ops = ops;
964 ndev->tx_headroom = tx_headroom;
965 ndev->tx_tailroom = tx_tailroom;
966 init_completion(&ndev->req_completion);
967
968 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
969 supported_protocols,
970 tx_headroom + NCI_DATA_HDR_SIZE,
971 tx_tailroom);
972 if (!ndev->nfc_dev)
973 goto free_nci;
974
975 ndev->hci_dev = nci_hci_allocate(ndev);
976 if (!ndev->hci_dev)
977 goto free_nfc;
978
979 nfc_set_drvdata(ndev->nfc_dev, ndev);
980
981 return ndev;
982
983 free_nfc:
984 kfree(ndev->nfc_dev);
985
986 free_nci:
987 kfree(ndev);
988 return NULL;
989 }
990 EXPORT_SYMBOL(nci_allocate_device);
991
992 /**
993 * nci_free_device - deallocate nci device
994 *
995 * @ndev: The nci device to deallocate
996 */
997 void nci_free_device(struct nci_dev *ndev)
998 {
999 nfc_free_device(ndev->nfc_dev);
1000 kfree(ndev);
1001 }
1002 EXPORT_SYMBOL(nci_free_device);
1003
1004 /**
1005 * nci_register_device - register a nci device in the nfc subsystem
1006 *
1007 * @dev: The nci device to register
1008 */
1009 int nci_register_device(struct nci_dev *ndev)
1010 {
1011 int rc;
1012 struct device *dev = &ndev->nfc_dev->dev;
1013 char name[32];
1014
1015 ndev->flags = 0;
1016
1017 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
1018 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
1019 ndev->cmd_wq = create_singlethread_workqueue(name);
1020 if (!ndev->cmd_wq) {
1021 rc = -ENOMEM;
1022 goto exit;
1023 }
1024
1025 INIT_WORK(&ndev->rx_work, nci_rx_work);
1026 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
1027 ndev->rx_wq = create_singlethread_workqueue(name);
1028 if (!ndev->rx_wq) {
1029 rc = -ENOMEM;
1030 goto destroy_cmd_wq_exit;
1031 }
1032
1033 INIT_WORK(&ndev->tx_work, nci_tx_work);
1034 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
1035 ndev->tx_wq = create_singlethread_workqueue(name);
1036 if (!ndev->tx_wq) {
1037 rc = -ENOMEM;
1038 goto destroy_rx_wq_exit;
1039 }
1040
1041 skb_queue_head_init(&ndev->cmd_q);
1042 skb_queue_head_init(&ndev->rx_q);
1043 skb_queue_head_init(&ndev->tx_q);
1044
1045 setup_timer(&ndev->cmd_timer, nci_cmd_timer,
1046 (unsigned long) ndev);
1047 setup_timer(&ndev->data_timer, nci_data_timer,
1048 (unsigned long) ndev);
1049
1050 mutex_init(&ndev->req_lock);
1051 INIT_LIST_HEAD(&ndev->conn_info_list);
1052
1053 rc = nfc_register_device(ndev->nfc_dev);
1054 if (rc)
1055 goto destroy_rx_wq_exit;
1056
1057 goto exit;
1058
1059 destroy_rx_wq_exit:
1060 destroy_workqueue(ndev->rx_wq);
1061
1062 destroy_cmd_wq_exit:
1063 destroy_workqueue(ndev->cmd_wq);
1064
1065 exit:
1066 return rc;
1067 }
1068 EXPORT_SYMBOL(nci_register_device);
1069
1070 /**
1071 * nci_unregister_device - unregister a nci device in the nfc subsystem
1072 *
1073 * @dev: The nci device to unregister
1074 */
1075 void nci_unregister_device(struct nci_dev *ndev)
1076 {
1077 struct nci_conn_info *conn_info, *n;
1078
1079 nci_close_device(ndev);
1080
1081 destroy_workqueue(ndev->cmd_wq);
1082 destroy_workqueue(ndev->rx_wq);
1083 destroy_workqueue(ndev->tx_wq);
1084
1085 list_for_each_entry_safe(conn_info, n, &ndev->conn_info_list, list) {
1086 list_del(&conn_info->list);
1087 /* conn_info is allocated with devm_kzalloc */
1088 }
1089
1090 nfc_unregister_device(ndev->nfc_dev);
1091 }
1092 EXPORT_SYMBOL(nci_unregister_device);
1093
1094 /**
1095 * nci_recv_frame - receive frame from NCI drivers
1096 *
1097 * @ndev: The nci device
1098 * @skb: The sk_buff to receive
1099 */
1100 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
1101 {
1102 pr_debug("len %d\n", skb->len);
1103
1104 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
1105 !test_bit(NCI_INIT, &ndev->flags))) {
1106 kfree_skb(skb);
1107 return -ENXIO;
1108 }
1109
1110 /* Queue frame for rx worker thread */
1111 skb_queue_tail(&ndev->rx_q, skb);
1112 queue_work(ndev->rx_wq, &ndev->rx_work);
1113
1114 return 0;
1115 }
1116 EXPORT_SYMBOL(nci_recv_frame);
1117
1118 static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
1119 {
1120 pr_debug("len %d\n", skb->len);
1121
1122 if (!ndev) {
1123 kfree_skb(skb);
1124 return -ENODEV;
1125 }
1126
1127 /* Get rid of skb owner, prior to sending to the driver. */
1128 skb_orphan(skb);
1129
1130 /* Send copy to sniffer */
1131 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1132 RAW_PAYLOAD_NCI, NFC_DIRECTION_TX);
1133
1134 return ndev->ops->send(ndev, skb);
1135 }
1136
1137 /* Send NCI command */
1138 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
1139 {
1140 struct nci_ctrl_hdr *hdr;
1141 struct sk_buff *skb;
1142
1143 pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
1144
1145 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
1146 if (!skb) {
1147 pr_err("no memory for command\n");
1148 return -ENOMEM;
1149 }
1150
1151 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
1152 hdr->gid = nci_opcode_gid(opcode);
1153 hdr->oid = nci_opcode_oid(opcode);
1154 hdr->plen = plen;
1155
1156 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
1157 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
1158
1159 if (plen)
1160 memcpy(skb_put(skb, plen), payload, plen);
1161
1162 skb_queue_tail(&ndev->cmd_q, skb);
1163 queue_work(ndev->cmd_wq, &ndev->cmd_work);
1164
1165 return 0;
1166 }
1167
1168 /* ---- NCI TX Data worker thread ---- */
1169
1170 static void nci_tx_work(struct work_struct *work)
1171 {
1172 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
1173 struct nci_conn_info *conn_info;
1174 struct sk_buff *skb;
1175
1176 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
1177 if (!conn_info)
1178 return;
1179
1180 pr_debug("credits_cnt %d\n", atomic_read(&conn_info->credits_cnt));
1181
1182 /* Send queued tx data */
1183 while (atomic_read(&conn_info->credits_cnt)) {
1184 skb = skb_dequeue(&ndev->tx_q);
1185 if (!skb)
1186 return;
1187
1188 /* Check if data flow control is used */
1189 if (atomic_read(&conn_info->credits_cnt) !=
1190 NCI_DATA_FLOW_CONTROL_NOT_USED)
1191 atomic_dec(&conn_info->credits_cnt);
1192
1193 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
1194 nci_pbf(skb->data),
1195 nci_conn_id(skb->data),
1196 nci_plen(skb->data));
1197
1198 nci_send_frame(ndev, skb);
1199
1200 mod_timer(&ndev->data_timer,
1201 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
1202 }
1203 }
1204
1205 /* ----- NCI RX worker thread (data & control) ----- */
1206
1207 static void nci_rx_work(struct work_struct *work)
1208 {
1209 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
1210 struct sk_buff *skb;
1211
1212 while ((skb = skb_dequeue(&ndev->rx_q))) {
1213
1214 /* Send copy to sniffer */
1215 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1216 RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
1217
1218 /* Process frame */
1219 switch (nci_mt(skb->data)) {
1220 case NCI_MT_RSP_PKT:
1221 nci_rsp_packet(ndev, skb);
1222 break;
1223
1224 case NCI_MT_NTF_PKT:
1225 nci_ntf_packet(ndev, skb);
1226 break;
1227
1228 case NCI_MT_DATA_PKT:
1229 nci_rx_data_packet(ndev, skb);
1230 break;
1231
1232 default:
1233 pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
1234 kfree_skb(skb);
1235 break;
1236 }
1237 }
1238
1239 /* check if a data exchange timout has occurred */
1240 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
1241 /* complete the data exchange transaction, if exists */
1242 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1243 nci_data_exchange_complete(ndev, NULL,
1244 ndev->cur_conn_id,
1245 -ETIMEDOUT);
1246
1247 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
1248 }
1249 }
1250
1251 /* ----- NCI TX CMD worker thread ----- */
1252
1253 static void nci_cmd_work(struct work_struct *work)
1254 {
1255 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
1256 struct sk_buff *skb;
1257
1258 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
1259
1260 /* Send queued command */
1261 if (atomic_read(&ndev->cmd_cnt)) {
1262 skb = skb_dequeue(&ndev->cmd_q);
1263 if (!skb)
1264 return;
1265
1266 atomic_dec(&ndev->cmd_cnt);
1267
1268 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
1269 nci_pbf(skb->data),
1270 nci_opcode_gid(nci_opcode(skb->data)),
1271 nci_opcode_oid(nci_opcode(skb->data)),
1272 nci_plen(skb->data));
1273
1274 nci_send_frame(ndev, skb);
1275
1276 mod_timer(&ndev->cmd_timer,
1277 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
1278 }
1279 }
1280
1281 MODULE_LICENSE("GPL");
Linux with added FPC-III support