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NFC: NCI: Implement Target mode send function
[deliverable/linux.git] / net / nfc / nci / core.c
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 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,
70 void (*req)(struct nci_dev *ndev, unsigned long opt),
71 unsigned long opt, __u32 timeout)
72 {
73 int rc = 0;
74 long completion_rc;
75
76 ndev->req_status = NCI_REQ_PEND;
77
78 reinit_completion(&ndev->req_completion);
79 req(ndev, opt);
80 completion_rc =
81 wait_for_completion_interruptible_timeout(&ndev->req_completion,
82 timeout);
83
84 pr_debug("wait_for_completion return %ld\n", completion_rc);
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 {
101 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
102 completion_rc);
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,
113 void (*req)(struct nci_dev *ndev,
114 unsigned long opt),
115 unsigned long opt, __u32 timeout)
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 {
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);
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 {
145 struct nci_rf_disc_map_cmd cmd;
146 struct disc_map_config *cfg = cmd.mapping_configs;
147 __u8 *num = &cmd.num_mapping_configs;
148 int i;
149
150 /* set rf mapping configurations */
151 *num = 0;
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] ==
156 NCI_RF_INTERFACE_ISO_DEP) {
157 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
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;
161 (*num)++;
162 } else if (ndev->supported_rf_interfaces[i] ==
163 NCI_RF_INTERFACE_NFC_DEP) {
164 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
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;
168 (*num)++;
169 }
170
171 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
172 break;
173 }
174
175 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
176 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
177 }
178
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
200 struct nci_rf_discover_param {
201 __u32 im_protocols;
202 __u32 tm_protocols;
203 };
204
205 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
206 {
207 struct nci_rf_discover_param *param =
208 (struct nci_rf_discover_param *)opt;
209 struct nci_rf_disc_cmd cmd;
210
211 cmd.num_disc_configs = 0;
212
213 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
214 (param->im_protocols & NFC_PROTO_JEWEL_MASK ||
215 param->im_protocols & NFC_PROTO_MIFARE_MASK ||
216 param->im_protocols & NFC_PROTO_ISO14443_MASK ||
217 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
218 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
219 NCI_NFC_A_PASSIVE_POLL_MODE;
220 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
221 cmd.num_disc_configs++;
222 }
223
224 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
225 (param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) {
226 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
227 NCI_NFC_B_PASSIVE_POLL_MODE;
228 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
229 cmd.num_disc_configs++;
230 }
231
232 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
233 (param->im_protocols & NFC_PROTO_FELICA_MASK ||
234 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
235 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
236 NCI_NFC_F_PASSIVE_POLL_MODE;
237 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
238 cmd.num_disc_configs++;
239 }
240
241 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
242 (param->im_protocols & NFC_PROTO_ISO15693_MASK)) {
243 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
244 NCI_NFC_V_PASSIVE_POLL_MODE;
245 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
246 cmd.num_disc_configs++;
247 }
248
249 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) &&
250 (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) {
251 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
252 NCI_NFC_A_PASSIVE_LISTEN_MODE;
253 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
254 cmd.num_disc_configs++;
255 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
256 NCI_NFC_F_PASSIVE_LISTEN_MODE;
257 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
258 cmd.num_disc_configs++;
259 }
260
261 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
262 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
263 &cmd);
264 }
265
266 struct nci_rf_discover_select_param {
267 __u8 rf_discovery_id;
268 __u8 rf_protocol;
269 };
270
271 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
272 {
273 struct nci_rf_discover_select_param *param =
274 (struct nci_rf_discover_select_param *)opt;
275 struct nci_rf_discover_select_cmd cmd;
276
277 cmd.rf_discovery_id = param->rf_discovery_id;
278 cmd.rf_protocol = param->rf_protocol;
279
280 switch (cmd.rf_protocol) {
281 case NCI_RF_PROTOCOL_ISO_DEP:
282 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
283 break;
284
285 case NCI_RF_PROTOCOL_NFC_DEP:
286 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
287 break;
288
289 default:
290 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
291 break;
292 }
293
294 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
295 sizeof(struct nci_rf_discover_select_cmd), &cmd);
296 }
297
298 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
299 {
300 struct nci_rf_deactivate_cmd cmd;
301
302 cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
303
304 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
305 sizeof(struct nci_rf_deactivate_cmd), &cmd);
306 }
307
308 static int nci_open_device(struct nci_dev *ndev)
309 {
310 int rc = 0;
311
312 mutex_lock(&ndev->req_lock);
313
314 if (test_bit(NCI_UP, &ndev->flags)) {
315 rc = -EALREADY;
316 goto done;
317 }
318
319 if (ndev->ops->open(ndev)) {
320 rc = -EIO;
321 goto done;
322 }
323
324 atomic_set(&ndev->cmd_cnt, 1);
325
326 set_bit(NCI_INIT, &ndev->flags);
327
328 rc = __nci_request(ndev, nci_reset_req, 0,
329 msecs_to_jiffies(NCI_RESET_TIMEOUT));
330
331 if (ndev->ops->setup)
332 ndev->ops->setup(ndev);
333
334 if (!rc) {
335 rc = __nci_request(ndev, nci_init_req, 0,
336 msecs_to_jiffies(NCI_INIT_TIMEOUT));
337 }
338
339 if (!rc) {
340 rc = __nci_request(ndev, nci_init_complete_req, 0,
341 msecs_to_jiffies(NCI_INIT_TIMEOUT));
342 }
343
344 clear_bit(NCI_INIT, &ndev->flags);
345
346 if (!rc) {
347 set_bit(NCI_UP, &ndev->flags);
348 nci_clear_target_list(ndev);
349 atomic_set(&ndev->state, NCI_IDLE);
350 } else {
351 /* Init failed, cleanup */
352 skb_queue_purge(&ndev->cmd_q);
353 skb_queue_purge(&ndev->rx_q);
354 skb_queue_purge(&ndev->tx_q);
355
356 ndev->ops->close(ndev);
357 ndev->flags = 0;
358 }
359
360 done:
361 mutex_unlock(&ndev->req_lock);
362 return rc;
363 }
364
365 static int nci_close_device(struct nci_dev *ndev)
366 {
367 nci_req_cancel(ndev, ENODEV);
368 mutex_lock(&ndev->req_lock);
369
370 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
371 del_timer_sync(&ndev->cmd_timer);
372 del_timer_sync(&ndev->data_timer);
373 mutex_unlock(&ndev->req_lock);
374 return 0;
375 }
376
377 /* Drop RX and TX queues */
378 skb_queue_purge(&ndev->rx_q);
379 skb_queue_purge(&ndev->tx_q);
380
381 /* Flush RX and TX wq */
382 flush_workqueue(ndev->rx_wq);
383 flush_workqueue(ndev->tx_wq);
384
385 /* Reset device */
386 skb_queue_purge(&ndev->cmd_q);
387 atomic_set(&ndev->cmd_cnt, 1);
388
389 set_bit(NCI_INIT, &ndev->flags);
390 __nci_request(ndev, nci_reset_req, 0,
391 msecs_to_jiffies(NCI_RESET_TIMEOUT));
392 clear_bit(NCI_INIT, &ndev->flags);
393
394 del_timer_sync(&ndev->cmd_timer);
395
396 /* Flush cmd wq */
397 flush_workqueue(ndev->cmd_wq);
398
399 /* After this point our queues are empty
400 * and no works are scheduled. */
401 ndev->ops->close(ndev);
402
403 /* Clear flags */
404 ndev->flags = 0;
405
406 mutex_unlock(&ndev->req_lock);
407
408 return 0;
409 }
410
411 /* NCI command timer function */
412 static void nci_cmd_timer(unsigned long arg)
413 {
414 struct nci_dev *ndev = (void *) arg;
415
416 atomic_set(&ndev->cmd_cnt, 1);
417 queue_work(ndev->cmd_wq, &ndev->cmd_work);
418 }
419
420 /* NCI data exchange timer function */
421 static void nci_data_timer(unsigned long arg)
422 {
423 struct nci_dev *ndev = (void *) arg;
424
425 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
426 queue_work(ndev->rx_wq, &ndev->rx_work);
427 }
428
429 static int nci_dev_up(struct nfc_dev *nfc_dev)
430 {
431 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
432
433 return nci_open_device(ndev);
434 }
435
436 static int nci_dev_down(struct nfc_dev *nfc_dev)
437 {
438 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
439
440 return nci_close_device(ndev);
441 }
442
443 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val)
444 {
445 struct nci_set_config_param param;
446
447 if (!val || !len)
448 return 0;
449
450 param.id = id;
451 param.len = len;
452 param.val = val;
453
454 return __nci_request(ndev, nci_set_config_req, (unsigned long)&param,
455 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
456 }
457 EXPORT_SYMBOL(nci_set_config);
458
459 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
460 {
461 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
462 struct nci_set_config_param param;
463 int rc;
464
465 param.val = nfc_get_local_general_bytes(nfc_dev, &param.len);
466 if ((param.val == NULL) || (param.len == 0))
467 return 0;
468
469 if (param.len > NFC_MAX_GT_LEN)
470 return -EINVAL;
471
472 param.id = NCI_PN_ATR_REQ_GEN_BYTES;
473
474 rc = nci_request(ndev, nci_set_config_req, (unsigned long)&param,
475 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
476 if (rc)
477 return rc;
478
479 param.id = NCI_LN_ATR_RES_GEN_BYTES;
480
481 return nci_request(ndev, nci_set_config_req, (unsigned long)&param,
482 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
483 }
484
485 static int nci_set_listen_parameters(struct nfc_dev *nfc_dev)
486 {
487 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
488 int rc;
489 __u8 val;
490
491 val = NCI_LA_SEL_INFO_NFC_DEP_MASK;
492
493 rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val);
494 if (rc)
495 return rc;
496
497 val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK;
498
499 rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val);
500 if (rc)
501 return rc;
502
503 val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424;
504
505 return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val);
506 }
507
508 static int nci_start_poll(struct nfc_dev *nfc_dev,
509 __u32 im_protocols, __u32 tm_protocols)
510 {
511 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
512 struct nci_rf_discover_param param;
513 int rc;
514
515 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
516 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
517 pr_err("unable to start poll, since poll is already active\n");
518 return -EBUSY;
519 }
520
521 if (ndev->target_active_prot) {
522 pr_err("there is an active target\n");
523 return -EBUSY;
524 }
525
526 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
527 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
528 pr_debug("target active or w4 select, implicitly deactivate\n");
529
530 rc = nci_request(ndev, nci_rf_deactivate_req, 0,
531 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
532 if (rc)
533 return -EBUSY;
534 }
535
536 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
537 rc = nci_set_local_general_bytes(nfc_dev);
538 if (rc) {
539 pr_err("failed to set local general bytes\n");
540 return rc;
541 }
542 }
543
544 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
545 rc = nci_set_listen_parameters(nfc_dev);
546 if (rc)
547 pr_err("failed to set listen parameters\n");
548 }
549
550 param.im_protocols = im_protocols;
551 param.tm_protocols = tm_protocols;
552 rc = nci_request(ndev, nci_rf_discover_req, (unsigned long)&param,
553 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
554
555 if (!rc)
556 ndev->poll_prots = im_protocols;
557
558 return rc;
559 }
560
561 static void nci_stop_poll(struct nfc_dev *nfc_dev)
562 {
563 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
564
565 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
566 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
567 pr_err("unable to stop poll, since poll is not active\n");
568 return;
569 }
570
571 nci_request(ndev, nci_rf_deactivate_req, 0,
572 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
573 }
574
575 static int nci_activate_target(struct nfc_dev *nfc_dev,
576 struct nfc_target *target, __u32 protocol)
577 {
578 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
579 struct nci_rf_discover_select_param param;
580 struct nfc_target *nci_target = NULL;
581 int i;
582 int rc = 0;
583
584 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
585
586 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
587 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
588 pr_err("there is no available target to activate\n");
589 return -EINVAL;
590 }
591
592 if (ndev->target_active_prot) {
593 pr_err("there is already an active target\n");
594 return -EBUSY;
595 }
596
597 for (i = 0; i < ndev->n_targets; i++) {
598 if (ndev->targets[i].idx == target->idx) {
599 nci_target = &ndev->targets[i];
600 break;
601 }
602 }
603
604 if (!nci_target) {
605 pr_err("unable to find the selected target\n");
606 return -EINVAL;
607 }
608
609 if (!(nci_target->supported_protocols & (1 << protocol))) {
610 pr_err("target does not support the requested protocol 0x%x\n",
611 protocol);
612 return -EINVAL;
613 }
614
615 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
616 param.rf_discovery_id = nci_target->logical_idx;
617
618 if (protocol == NFC_PROTO_JEWEL)
619 param.rf_protocol = NCI_RF_PROTOCOL_T1T;
620 else if (protocol == NFC_PROTO_MIFARE)
621 param.rf_protocol = NCI_RF_PROTOCOL_T2T;
622 else if (protocol == NFC_PROTO_FELICA)
623 param.rf_protocol = NCI_RF_PROTOCOL_T3T;
624 else if (protocol == NFC_PROTO_ISO14443 ||
625 protocol == NFC_PROTO_ISO14443_B)
626 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
627 else
628 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
629
630 rc = nci_request(ndev, nci_rf_discover_select_req,
631 (unsigned long)&param,
632 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
633 }
634
635 if (!rc)
636 ndev->target_active_prot = protocol;
637
638 return rc;
639 }
640
641 static void nci_deactivate_target(struct nfc_dev *nfc_dev,
642 struct nfc_target *target)
643 {
644 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
645
646 pr_debug("entry\n");
647
648 if (!ndev->target_active_prot) {
649 pr_err("unable to deactivate target, no active target\n");
650 return;
651 }
652
653 ndev->target_active_prot = 0;
654
655 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
656 nci_request(ndev, nci_rf_deactivate_req, 0,
657 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
658 }
659 }
660
661 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
662 __u8 comm_mode, __u8 *gb, size_t gb_len)
663 {
664 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
665 int rc;
666
667 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
668
669 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
670 if (rc)
671 return rc;
672
673 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
674 ndev->remote_gb_len);
675 if (!rc)
676 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
677 NFC_RF_INITIATOR);
678
679 return rc;
680 }
681
682 static int nci_dep_link_down(struct nfc_dev *nfc_dev)
683 {
684 pr_debug("entry\n");
685
686 nci_deactivate_target(nfc_dev, NULL);
687
688 return 0;
689 }
690
691
692 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
693 struct sk_buff *skb,
694 data_exchange_cb_t cb, void *cb_context)
695 {
696 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
697 int rc;
698
699 pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
700
701 if (!ndev->target_active_prot) {
702 pr_err("unable to exchange data, no active target\n");
703 return -EINVAL;
704 }
705
706 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
707 return -EBUSY;
708
709 /* store cb and context to be used on receiving data */
710 ndev->data_exchange_cb = cb;
711 ndev->data_exchange_cb_context = cb_context;
712
713 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
714 if (rc)
715 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
716
717 return rc;
718 }
719
720 static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
721 {
722 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
723 int rc;
724
725 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
726 if (rc)
727 pr_err("unable to send data\n");
728
729 return rc;
730 }
731
732 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
733 {
734 return 0;
735 }
736
737 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
738 {
739 return 0;
740 }
741
742 static int nci_discover_se(struct nfc_dev *nfc_dev)
743 {
744 return 0;
745 }
746
747 static struct nfc_ops nci_nfc_ops = {
748 .dev_up = nci_dev_up,
749 .dev_down = nci_dev_down,
750 .start_poll = nci_start_poll,
751 .stop_poll = nci_stop_poll,
752 .dep_link_up = nci_dep_link_up,
753 .dep_link_down = nci_dep_link_down,
754 .activate_target = nci_activate_target,
755 .deactivate_target = nci_deactivate_target,
756 .im_transceive = nci_transceive,
757 .tm_send = nci_tm_send,
758 .enable_se = nci_enable_se,
759 .disable_se = nci_disable_se,
760 .discover_se = nci_discover_se,
761 };
762
763 /* ---- Interface to NCI drivers ---- */
764
765 /**
766 * nci_allocate_device - allocate a new nci device
767 *
768 * @ops: device operations
769 * @supported_protocols: NFC protocols supported by the device
770 */
771 struct nci_dev *nci_allocate_device(struct nci_ops *ops,
772 __u32 supported_protocols,
773 int tx_headroom, int tx_tailroom)
774 {
775 struct nci_dev *ndev;
776
777 pr_debug("supported_protocols 0x%x\n", supported_protocols);
778
779 if (!ops->open || !ops->close || !ops->send)
780 return NULL;
781
782 if (!supported_protocols)
783 return NULL;
784
785 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
786 if (!ndev)
787 return NULL;
788
789 ndev->ops = ops;
790 ndev->tx_headroom = tx_headroom;
791 ndev->tx_tailroom = tx_tailroom;
792 init_completion(&ndev->req_completion);
793
794 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
795 supported_protocols,
796 tx_headroom + NCI_DATA_HDR_SIZE,
797 tx_tailroom);
798 if (!ndev->nfc_dev)
799 goto free_exit;
800
801 nfc_set_drvdata(ndev->nfc_dev, ndev);
802
803 return ndev;
804
805 free_exit:
806 kfree(ndev);
807 return NULL;
808 }
809 EXPORT_SYMBOL(nci_allocate_device);
810
811 /**
812 * nci_free_device - deallocate nci device
813 *
814 * @ndev: The nci device to deallocate
815 */
816 void nci_free_device(struct nci_dev *ndev)
817 {
818 nfc_free_device(ndev->nfc_dev);
819 kfree(ndev);
820 }
821 EXPORT_SYMBOL(nci_free_device);
822
823 /**
824 * nci_register_device - register a nci device in the nfc subsystem
825 *
826 * @dev: The nci device to register
827 */
828 int nci_register_device(struct nci_dev *ndev)
829 {
830 int rc;
831 struct device *dev = &ndev->nfc_dev->dev;
832 char name[32];
833
834 ndev->flags = 0;
835
836 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
837 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
838 ndev->cmd_wq = create_singlethread_workqueue(name);
839 if (!ndev->cmd_wq) {
840 rc = -ENOMEM;
841 goto exit;
842 }
843
844 INIT_WORK(&ndev->rx_work, nci_rx_work);
845 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
846 ndev->rx_wq = create_singlethread_workqueue(name);
847 if (!ndev->rx_wq) {
848 rc = -ENOMEM;
849 goto destroy_cmd_wq_exit;
850 }
851
852 INIT_WORK(&ndev->tx_work, nci_tx_work);
853 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
854 ndev->tx_wq = create_singlethread_workqueue(name);
855 if (!ndev->tx_wq) {
856 rc = -ENOMEM;
857 goto destroy_rx_wq_exit;
858 }
859
860 skb_queue_head_init(&ndev->cmd_q);
861 skb_queue_head_init(&ndev->rx_q);
862 skb_queue_head_init(&ndev->tx_q);
863
864 setup_timer(&ndev->cmd_timer, nci_cmd_timer,
865 (unsigned long) ndev);
866 setup_timer(&ndev->data_timer, nci_data_timer,
867 (unsigned long) ndev);
868
869 mutex_init(&ndev->req_lock);
870
871 rc = nfc_register_device(ndev->nfc_dev);
872 if (rc)
873 goto destroy_rx_wq_exit;
874
875 goto exit;
876
877 destroy_rx_wq_exit:
878 destroy_workqueue(ndev->rx_wq);
879
880 destroy_cmd_wq_exit:
881 destroy_workqueue(ndev->cmd_wq);
882
883 exit:
884 return rc;
885 }
886 EXPORT_SYMBOL(nci_register_device);
887
888 /**
889 * nci_unregister_device - unregister a nci device in the nfc subsystem
890 *
891 * @dev: The nci device to unregister
892 */
893 void nci_unregister_device(struct nci_dev *ndev)
894 {
895 nci_close_device(ndev);
896
897 destroy_workqueue(ndev->cmd_wq);
898 destroy_workqueue(ndev->rx_wq);
899 destroy_workqueue(ndev->tx_wq);
900
901 nfc_unregister_device(ndev->nfc_dev);
902 }
903 EXPORT_SYMBOL(nci_unregister_device);
904
905 /**
906 * nci_recv_frame - receive frame from NCI drivers
907 *
908 * @ndev: The nci device
909 * @skb: The sk_buff to receive
910 */
911 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
912 {
913 pr_debug("len %d\n", skb->len);
914
915 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
916 !test_bit(NCI_INIT, &ndev->flags))) {
917 kfree_skb(skb);
918 return -ENXIO;
919 }
920
921 /* Queue frame for rx worker thread */
922 skb_queue_tail(&ndev->rx_q, skb);
923 queue_work(ndev->rx_wq, &ndev->rx_work);
924
925 return 0;
926 }
927 EXPORT_SYMBOL(nci_recv_frame);
928
929 static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
930 {
931 pr_debug("len %d\n", skb->len);
932
933 if (!ndev) {
934 kfree_skb(skb);
935 return -ENODEV;
936 }
937
938 /* Get rid of skb owner, prior to sending to the driver. */
939 skb_orphan(skb);
940
941 /* Send copy to sniffer */
942 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
943 RAW_PAYLOAD_NCI, NFC_DIRECTION_TX);
944
945 return ndev->ops->send(ndev, skb);
946 }
947
948 /* Send NCI command */
949 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
950 {
951 struct nci_ctrl_hdr *hdr;
952 struct sk_buff *skb;
953
954 pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
955
956 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
957 if (!skb) {
958 pr_err("no memory for command\n");
959 return -ENOMEM;
960 }
961
962 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
963 hdr->gid = nci_opcode_gid(opcode);
964 hdr->oid = nci_opcode_oid(opcode);
965 hdr->plen = plen;
966
967 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
968 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
969
970 if (plen)
971 memcpy(skb_put(skb, plen), payload, plen);
972
973 skb_queue_tail(&ndev->cmd_q, skb);
974 queue_work(ndev->cmd_wq, &ndev->cmd_work);
975
976 return 0;
977 }
978
979 /* ---- NCI TX Data worker thread ---- */
980
981 static void nci_tx_work(struct work_struct *work)
982 {
983 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
984 struct sk_buff *skb;
985
986 pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt));
987
988 /* Send queued tx data */
989 while (atomic_read(&ndev->credits_cnt)) {
990 skb = skb_dequeue(&ndev->tx_q);
991 if (!skb)
992 return;
993
994 /* Check if data flow control is used */
995 if (atomic_read(&ndev->credits_cnt) !=
996 NCI_DATA_FLOW_CONTROL_NOT_USED)
997 atomic_dec(&ndev->credits_cnt);
998
999 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
1000 nci_pbf(skb->data),
1001 nci_conn_id(skb->data),
1002 nci_plen(skb->data));
1003
1004 nci_send_frame(ndev, skb);
1005
1006 mod_timer(&ndev->data_timer,
1007 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
1008 }
1009 }
1010
1011 /* ----- NCI RX worker thread (data & control) ----- */
1012
1013 static void nci_rx_work(struct work_struct *work)
1014 {
1015 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
1016 struct sk_buff *skb;
1017
1018 while ((skb = skb_dequeue(&ndev->rx_q))) {
1019
1020 /* Send copy to sniffer */
1021 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1022 RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
1023
1024 /* Process frame */
1025 switch (nci_mt(skb->data)) {
1026 case NCI_MT_RSP_PKT:
1027 nci_rsp_packet(ndev, skb);
1028 break;
1029
1030 case NCI_MT_NTF_PKT:
1031 nci_ntf_packet(ndev, skb);
1032 break;
1033
1034 case NCI_MT_DATA_PKT:
1035 nci_rx_data_packet(ndev, skb);
1036 break;
1037
1038 default:
1039 pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
1040 kfree_skb(skb);
1041 break;
1042 }
1043 }
1044
1045 /* check if a data exchange timout has occurred */
1046 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
1047 /* complete the data exchange transaction, if exists */
1048 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1049 nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT);
1050
1051 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
1052 }
1053 }
1054
1055 /* ----- NCI TX CMD worker thread ----- */
1056
1057 static void nci_cmd_work(struct work_struct *work)
1058 {
1059 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
1060 struct sk_buff *skb;
1061
1062 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
1063
1064 /* Send queued command */
1065 if (atomic_read(&ndev->cmd_cnt)) {
1066 skb = skb_dequeue(&ndev->cmd_q);
1067 if (!skb)
1068 return;
1069
1070 atomic_dec(&ndev->cmd_cnt);
1071
1072 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
1073 nci_pbf(skb->data),
1074 nci_opcode_gid(nci_opcode(skb->data)),
1075 nci_opcode_oid(nci_opcode(skb->data)),
1076 nci_plen(skb->data));
1077
1078 nci_send_frame(ndev, skb);
1079
1080 mod_timer(&ndev->cmd_timer,
1081 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
1082 }
1083 }
1084
1085 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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