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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
28#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
29
30#include <linux/types.h>
31#include <linux/workqueue.h>
32#include <linux/completion.h>
33#include <linux/export.h>
34#include <linux/sched.h>
35#include <linux/bitops.h>
36#include <linux/skbuff.h>
37
38#include "../nfc.h"
39#include <net/nfc/nci.h>
40#include <net/nfc/nci_core.h>
41#include <linux/nfc.h>
42
43static void nci_cmd_work(struct work_struct *work);
44static void nci_rx_work(struct work_struct *work);
45static void nci_tx_work(struct work_struct *work);
46
47/* ---- NCI requests ---- */
48
49void nci_req_complete(struct nci_dev *ndev, int result)
50{
51 if (ndev->req_status == NCI_REQ_PEND) {
52 ndev->req_result = result;
53 ndev->req_status = NCI_REQ_DONE;
54 complete(&ndev->req_completion);
55 }
56}
57
58static void nci_req_cancel(struct nci_dev *ndev, int err)
59{
60 if (ndev->req_status == NCI_REQ_PEND) {
61 ndev->req_result = err;
62 ndev->req_status = NCI_REQ_CANCELED;
63 complete(&ndev->req_completion);
64 }
65}
66
67/* Execute request and wait for completion. */
68static int __nci_request(struct nci_dev *ndev,
69 void (*req)(struct nci_dev *ndev, unsigned long opt),
70 unsigned long opt, __u32 timeout)
71{
72 int rc = 0;
73 long completion_rc;
74
75 ndev->req_status = NCI_REQ_PEND;
76
77 init_completion(&ndev->req_completion);
78 req(ndev, opt);
79 completion_rc =
80 wait_for_completion_interruptible_timeout(&ndev->req_completion,
81 timeout);
82
83 pr_debug("wait_for_completion return %ld\n", completion_rc);
84
85 if (completion_rc > 0) {
86 switch (ndev->req_status) {
87 case NCI_REQ_DONE:
88 rc = nci_to_errno(ndev->req_result);
89 break;
90
91 case NCI_REQ_CANCELED:
92 rc = -ndev->req_result;
93 break;
94
95 default:
96 rc = -ETIMEDOUT;
97 break;
98 }
99 } else {
100 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
101 completion_rc);
102
103 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
104 }
105
106 ndev->req_status = ndev->req_result = 0;
107
108 return rc;
109}
110
111static inline int nci_request(struct nci_dev *ndev,
112 void (*req)(struct nci_dev *ndev,
113 unsigned long opt),
114 unsigned long opt, __u32 timeout)
115{
116 int rc;
117
118 if (!test_bit(NCI_UP, &ndev->flags))
119 return -ENETDOWN;
120
121 /* Serialize all requests */
122 mutex_lock(&ndev->req_lock);
123 rc = __nci_request(ndev, req, opt, timeout);
124 mutex_unlock(&ndev->req_lock);
125
126 return rc;
127}
128
129static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
130{
131 struct nci_core_reset_cmd cmd;
132
133 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
134 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
135}
136
137static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
138{
139 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
140}
141
142static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
143{
144 struct nci_rf_disc_map_cmd cmd;
145 struct disc_map_config *cfg = cmd.mapping_configs;
146 __u8 *num = &cmd.num_mapping_configs;
147 int i;
148
149 /* set rf mapping configurations */
150 *num = 0;
151
152 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
153 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
154 if (ndev->supported_rf_interfaces[i] ==
155 NCI_RF_INTERFACE_ISO_DEP) {
156 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
157 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
158 NCI_DISC_MAP_MODE_LISTEN;
159 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
160 (*num)++;
161 } else if (ndev->supported_rf_interfaces[i] ==
162 NCI_RF_INTERFACE_NFC_DEP) {
163 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
164 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
165 NCI_DISC_MAP_MODE_LISTEN;
166 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
167 (*num)++;
168 }
169
170 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
171 break;
172 }
173
174 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
175 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
176}
177
178static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
179{
180 struct nci_rf_disc_cmd cmd;
181 __u32 protocols = opt;
182
183 cmd.num_disc_configs = 0;
184
185 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
186 (protocols & NFC_PROTO_JEWEL_MASK
187 || protocols & NFC_PROTO_MIFARE_MASK
188 || protocols & NFC_PROTO_ISO14443_MASK
189 || protocols & NFC_PROTO_NFC_DEP_MASK)) {
190 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
191 NCI_NFC_A_PASSIVE_POLL_MODE;
192 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
193 cmd.num_disc_configs++;
194 }
195
196 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
197 (protocols & NFC_PROTO_ISO14443_MASK)) {
198 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
199 NCI_NFC_B_PASSIVE_POLL_MODE;
200 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
201 cmd.num_disc_configs++;
202 }
203
204 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
205 (protocols & NFC_PROTO_FELICA_MASK
206 || protocols & NFC_PROTO_NFC_DEP_MASK)) {
207 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
208 NCI_NFC_F_PASSIVE_POLL_MODE;
209 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
210 cmd.num_disc_configs++;
211 }
212
213 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
214 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
215 &cmd);
216}
217
218struct nci_rf_discover_select_param {
219 __u8 rf_discovery_id;
220 __u8 rf_protocol;
221};
222
223static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
224{
225 struct nci_rf_discover_select_param *param =
226 (struct nci_rf_discover_select_param *)opt;
227 struct nci_rf_discover_select_cmd cmd;
228
229 cmd.rf_discovery_id = param->rf_discovery_id;
230 cmd.rf_protocol = param->rf_protocol;
231
232 switch (cmd.rf_protocol) {
233 case NCI_RF_PROTOCOL_ISO_DEP:
234 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
235 break;
236
237 case NCI_RF_PROTOCOL_NFC_DEP:
238 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
239 break;
240
241 default:
242 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
243 break;
244 }
245
246 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
247 sizeof(struct nci_rf_discover_select_cmd), &cmd);
248}
249
250static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
251{
252 struct nci_rf_deactivate_cmd cmd;
253
254 cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
255
256 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
257 sizeof(struct nci_rf_deactivate_cmd), &cmd);
258}
259
260static int nci_open_device(struct nci_dev *ndev)
261{
262 int rc = 0;
263
264 mutex_lock(&ndev->req_lock);
265
266 if (test_bit(NCI_UP, &ndev->flags)) {
267 rc = -EALREADY;
268 goto done;
269 }
270
271 if (ndev->ops->open(ndev)) {
272 rc = -EIO;
273 goto done;
274 }
275
276 atomic_set(&ndev->cmd_cnt, 1);
277
278 set_bit(NCI_INIT, &ndev->flags);
279
280 rc = __nci_request(ndev, nci_reset_req, 0,
281 msecs_to_jiffies(NCI_RESET_TIMEOUT));
282
283 if (!rc) {
284 rc = __nci_request(ndev, nci_init_req, 0,
285 msecs_to_jiffies(NCI_INIT_TIMEOUT));
286 }
287
288 if (!rc) {
289 rc = __nci_request(ndev, nci_init_complete_req, 0,
290 msecs_to_jiffies(NCI_INIT_TIMEOUT));
291 }
292
293 clear_bit(NCI_INIT, &ndev->flags);
294
295 if (!rc) {
296 set_bit(NCI_UP, &ndev->flags);
297 nci_clear_target_list(ndev);
298 atomic_set(&ndev->state, NCI_IDLE);
299 } else {
300 /* Init failed, cleanup */
301 skb_queue_purge(&ndev->cmd_q);
302 skb_queue_purge(&ndev->rx_q);
303 skb_queue_purge(&ndev->tx_q);
304
305 ndev->ops->close(ndev);
306 ndev->flags = 0;
307 }
308
309done:
310 mutex_unlock(&ndev->req_lock);
311 return rc;
312}
313
314static int nci_close_device(struct nci_dev *ndev)
315{
316 nci_req_cancel(ndev, ENODEV);
317 mutex_lock(&ndev->req_lock);
318
319 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
320 del_timer_sync(&ndev->cmd_timer);
321 del_timer_sync(&ndev->data_timer);
322 mutex_unlock(&ndev->req_lock);
323 return 0;
324 }
325
326 /* Drop RX and TX queues */
327 skb_queue_purge(&ndev->rx_q);
328 skb_queue_purge(&ndev->tx_q);
329
330 /* Flush RX and TX wq */
331 flush_workqueue(ndev->rx_wq);
332 flush_workqueue(ndev->tx_wq);
333
334 /* Reset device */
335 skb_queue_purge(&ndev->cmd_q);
336 atomic_set(&ndev->cmd_cnt, 1);
337
338 set_bit(NCI_INIT, &ndev->flags);
339 __nci_request(ndev, nci_reset_req, 0,
340 msecs_to_jiffies(NCI_RESET_TIMEOUT));
341 clear_bit(NCI_INIT, &ndev->flags);
342
343 /* Flush cmd wq */
344 flush_workqueue(ndev->cmd_wq);
345
346 /* After this point our queues are empty
347 * and no works are scheduled. */
348 ndev->ops->close(ndev);
349
350 /* Clear flags */
351 ndev->flags = 0;
352
353 mutex_unlock(&ndev->req_lock);
354
355 return 0;
356}
357
358/* NCI command timer function */
359static void nci_cmd_timer(unsigned long arg)
360{
361 struct nci_dev *ndev = (void *) arg;
362
363 atomic_set(&ndev->cmd_cnt, 1);
364 queue_work(ndev->cmd_wq, &ndev->cmd_work);
365}
366
367/* NCI data exchange timer function */
368static void nci_data_timer(unsigned long arg)
369{
370 struct nci_dev *ndev = (void *) arg;
371
372 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
373 queue_work(ndev->rx_wq, &ndev->rx_work);
374}
375
376static int nci_dev_up(struct nfc_dev *nfc_dev)
377{
378 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
379
380 return nci_open_device(ndev);
381}
382
383static int nci_dev_down(struct nfc_dev *nfc_dev)
384{
385 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
386
387 return nci_close_device(ndev);
388}
389
390static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols)
391{
392 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
393 int rc;
394
395 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
396 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
397 pr_err("unable to start poll, since poll is already active\n");
398 return -EBUSY;
399 }
400
401 if (ndev->target_active_prot) {
402 pr_err("there is an active target\n");
403 return -EBUSY;
404 }
405
406 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
407 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
408 pr_debug("target active or w4 select, implicitly deactivate\n");
409
410 rc = nci_request(ndev, nci_rf_deactivate_req, 0,
411 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
412 if (rc)
413 return -EBUSY;
414 }
415
416 rc = nci_request(ndev, nci_rf_discover_req, protocols,
417 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
418
419 if (!rc)
420 ndev->poll_prots = protocols;
421
422 return rc;
423}
424
425static void nci_stop_poll(struct nfc_dev *nfc_dev)
426{
427 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
428
429 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
430 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
431 pr_err("unable to stop poll, since poll is not active\n");
432 return;
433 }
434
435 nci_request(ndev, nci_rf_deactivate_req, 0,
436 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
437}
438
439static int nci_activate_target(struct nfc_dev *nfc_dev,
440 struct nfc_target *target, __u32 protocol)
441{
442 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
443 struct nci_rf_discover_select_param param;
444 struct nfc_target *nci_target = NULL;
445 int i;
446 int rc = 0;
447
448 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
449
450 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
451 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
452 pr_err("there is no available target to activate\n");
453 return -EINVAL;
454 }
455
456 if (ndev->target_active_prot) {
457 pr_err("there is already an active target\n");
458 return -EBUSY;
459 }
460
461 for (i = 0; i < ndev->n_targets; i++) {
462 if (ndev->targets[i].idx == target->idx) {
463 nci_target = &ndev->targets[i];
464 break;
465 }
466 }
467
468 if (!nci_target) {
469 pr_err("unable to find the selected target\n");
470 return -EINVAL;
471 }
472
473 if (!(nci_target->supported_protocols & (1 << protocol))) {
474 pr_err("target does not support the requested protocol 0x%x\n",
475 protocol);
476 return -EINVAL;
477 }
478
479 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
480 param.rf_discovery_id = nci_target->logical_idx;
481
482 if (protocol == NFC_PROTO_JEWEL)
483 param.rf_protocol = NCI_RF_PROTOCOL_T1T;
484 else if (protocol == NFC_PROTO_MIFARE)
485 param.rf_protocol = NCI_RF_PROTOCOL_T2T;
486 else if (protocol == NFC_PROTO_FELICA)
487 param.rf_protocol = NCI_RF_PROTOCOL_T3T;
488 else if (protocol == NFC_PROTO_ISO14443)
489 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
490 else
491 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
492
493 rc = nci_request(ndev, nci_rf_discover_select_req,
494 (unsigned long)¶m,
495 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
496 }
497
498 if (!rc)
499 ndev->target_active_prot = protocol;
500
501 return rc;
502}
503
504static void nci_deactivate_target(struct nfc_dev *nfc_dev,
505 struct nfc_target *target)
506{
507 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
508
509 pr_debug("target_idx %d\n", target->idx);
510
511 if (!ndev->target_active_prot) {
512 pr_err("unable to deactivate target, no active target\n");
513 return;
514 }
515
516 ndev->target_active_prot = 0;
517
518 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
519 nci_request(ndev, nci_rf_deactivate_req, 0,
520 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
521 }
522}
523
524static int nci_data_exchange(struct nfc_dev *nfc_dev, struct nfc_target *target,
525 struct sk_buff *skb,
526 data_exchange_cb_t cb, void *cb_context)
527{
528 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
529 int rc;
530
531 pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
532
533 if (!ndev->target_active_prot) {
534 pr_err("unable to exchange data, no active target\n");
535 return -EINVAL;
536 }
537
538 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
539 return -EBUSY;
540
541 /* store cb and context to be used on receiving data */
542 ndev->data_exchange_cb = cb;
543 ndev->data_exchange_cb_context = cb_context;
544
545 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
546 if (rc)
547 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
548
549 return rc;
550}
551
552static struct nfc_ops nci_nfc_ops = {
553 .dev_up = nci_dev_up,
554 .dev_down = nci_dev_down,
555 .start_poll = nci_start_poll,
556 .stop_poll = nci_stop_poll,
557 .activate_target = nci_activate_target,
558 .deactivate_target = nci_deactivate_target,
559 .data_exchange = nci_data_exchange,
560};
561
562/* ---- Interface to NCI drivers ---- */
563
564/**
565 * nci_allocate_device - allocate a new nci device
566 *
567 * @ops: device operations
568 * @supported_protocols: NFC protocols supported by the device
569 */
570struct nci_dev *nci_allocate_device(struct nci_ops *ops,
571 __u32 supported_protocols,
572 int tx_headroom, int tx_tailroom)
573{
574 struct nci_dev *ndev;
575
576 pr_debug("supported_protocols 0x%x\n", supported_protocols);
577
578 if (!ops->open || !ops->close || !ops->send)
579 return NULL;
580
581 if (!supported_protocols)
582 return NULL;
583
584 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
585 if (!ndev)
586 return NULL;
587
588 ndev->ops = ops;
589 ndev->tx_headroom = tx_headroom;
590 ndev->tx_tailroom = tx_tailroom;
591
592 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
593 supported_protocols,
594 tx_headroom + NCI_DATA_HDR_SIZE,
595 tx_tailroom);
596 if (!ndev->nfc_dev)
597 goto free_exit;
598
599 nfc_set_drvdata(ndev->nfc_dev, ndev);
600
601 return ndev;
602
603free_exit:
604 kfree(ndev);
605 return NULL;
606}
607EXPORT_SYMBOL(nci_allocate_device);
608
609/**
610 * nci_free_device - deallocate nci device
611 *
612 * @ndev: The nci device to deallocate
613 */
614void nci_free_device(struct nci_dev *ndev)
615{
616 nfc_free_device(ndev->nfc_dev);
617 kfree(ndev);
618}
619EXPORT_SYMBOL(nci_free_device);
620
621/**
622 * nci_register_device - register a nci device in the nfc subsystem
623 *
624 * @dev: The nci device to register
625 */
626int nci_register_device(struct nci_dev *ndev)
627{
628 int rc;
629 struct device *dev = &ndev->nfc_dev->dev;
630 char name[32];
631
632 rc = nfc_register_device(ndev->nfc_dev);
633 if (rc)
634 goto exit;
635
636 ndev->flags = 0;
637
638 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
639 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
640 ndev->cmd_wq = create_singlethread_workqueue(name);
641 if (!ndev->cmd_wq) {
642 rc = -ENOMEM;
643 goto unreg_exit;
644 }
645
646 INIT_WORK(&ndev->rx_work, nci_rx_work);
647 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
648 ndev->rx_wq = create_singlethread_workqueue(name);
649 if (!ndev->rx_wq) {
650 rc = -ENOMEM;
651 goto destroy_cmd_wq_exit;
652 }
653
654 INIT_WORK(&ndev->tx_work, nci_tx_work);
655 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
656 ndev->tx_wq = create_singlethread_workqueue(name);
657 if (!ndev->tx_wq) {
658 rc = -ENOMEM;
659 goto destroy_rx_wq_exit;
660 }
661
662 skb_queue_head_init(&ndev->cmd_q);
663 skb_queue_head_init(&ndev->rx_q);
664 skb_queue_head_init(&ndev->tx_q);
665
666 setup_timer(&ndev->cmd_timer, nci_cmd_timer,
667 (unsigned long) ndev);
668 setup_timer(&ndev->data_timer, nci_data_timer,
669 (unsigned long) ndev);
670
671 mutex_init(&ndev->req_lock);
672
673 goto exit;
674
675destroy_rx_wq_exit:
676 destroy_workqueue(ndev->rx_wq);
677
678destroy_cmd_wq_exit:
679 destroy_workqueue(ndev->cmd_wq);
680
681unreg_exit:
682 nfc_unregister_device(ndev->nfc_dev);
683
684exit:
685 return rc;
686}
687EXPORT_SYMBOL(nci_register_device);
688
689/**
690 * nci_unregister_device - unregister a nci device in the nfc subsystem
691 *
692 * @dev: The nci device to unregister
693 */
694void nci_unregister_device(struct nci_dev *ndev)
695{
696 nci_close_device(ndev);
697
698 destroy_workqueue(ndev->cmd_wq);
699 destroy_workqueue(ndev->rx_wq);
700 destroy_workqueue(ndev->tx_wq);
701
702 nfc_unregister_device(ndev->nfc_dev);
703}
704EXPORT_SYMBOL(nci_unregister_device);
705
706/**
707 * nci_recv_frame - receive frame from NCI drivers
708 *
709 * @skb: The sk_buff to receive
710 */
711int nci_recv_frame(struct sk_buff *skb)
712{
713 struct nci_dev *ndev = (struct nci_dev *) skb->dev;
714
715 pr_debug("len %d\n", skb->len);
716
717 if (!ndev || (!test_bit(NCI_UP, &ndev->flags)
718 && !test_bit(NCI_INIT, &ndev->flags))) {
719 kfree_skb(skb);
720 return -ENXIO;
721 }
722
723 /* Queue frame for rx worker thread */
724 skb_queue_tail(&ndev->rx_q, skb);
725 queue_work(ndev->rx_wq, &ndev->rx_work);
726
727 return 0;
728}
729EXPORT_SYMBOL(nci_recv_frame);
730
731static int nci_send_frame(struct sk_buff *skb)
732{
733 struct nci_dev *ndev = (struct nci_dev *) skb->dev;
734
735 pr_debug("len %d\n", skb->len);
736
737 if (!ndev) {
738 kfree_skb(skb);
739 return -ENODEV;
740 }
741
742 /* Get rid of skb owner, prior to sending to the driver. */
743 skb_orphan(skb);
744
745 return ndev->ops->send(skb);
746}
747
748/* Send NCI command */
749int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
750{
751 struct nci_ctrl_hdr *hdr;
752 struct sk_buff *skb;
753
754 pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
755
756 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
757 if (!skb) {
758 pr_err("no memory for command\n");
759 return -ENOMEM;
760 }
761
762 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
763 hdr->gid = nci_opcode_gid(opcode);
764 hdr->oid = nci_opcode_oid(opcode);
765 hdr->plen = plen;
766
767 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
768 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
769
770 if (plen)
771 memcpy(skb_put(skb, plen), payload, plen);
772
773 skb->dev = (void *) ndev;
774
775 skb_queue_tail(&ndev->cmd_q, skb);
776 queue_work(ndev->cmd_wq, &ndev->cmd_work);
777
778 return 0;
779}
780
781/* ---- NCI TX Data worker thread ---- */
782
783static void nci_tx_work(struct work_struct *work)
784{
785 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
786 struct sk_buff *skb;
787
788 pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt));
789
790 /* Send queued tx data */
791 while (atomic_read(&ndev->credits_cnt)) {
792 skb = skb_dequeue(&ndev->tx_q);
793 if (!skb)
794 return;
795
796 /* Check if data flow control is used */
797 if (atomic_read(&ndev->credits_cnt) !=
798 NCI_DATA_FLOW_CONTROL_NOT_USED)
799 atomic_dec(&ndev->credits_cnt);
800
801 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
802 nci_pbf(skb->data),
803 nci_conn_id(skb->data),
804 nci_plen(skb->data));
805
806 nci_send_frame(skb);
807
808 mod_timer(&ndev->data_timer,
809 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
810 }
811}
812
813/* ----- NCI RX worker thread (data & control) ----- */
814
815static void nci_rx_work(struct work_struct *work)
816{
817 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
818 struct sk_buff *skb;
819
820 while ((skb = skb_dequeue(&ndev->rx_q))) {
821 /* Process frame */
822 switch (nci_mt(skb->data)) {
823 case NCI_MT_RSP_PKT:
824 nci_rsp_packet(ndev, skb);
825 break;
826
827 case NCI_MT_NTF_PKT:
828 nci_ntf_packet(ndev, skb);
829 break;
830
831 case NCI_MT_DATA_PKT:
832 nci_rx_data_packet(ndev, skb);
833 break;
834
835 default:
836 pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
837 kfree_skb(skb);
838 break;
839 }
840 }
841
842 /* check if a data exchange timout has occurred */
843 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
844 /* complete the data exchange transaction, if exists */
845 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
846 nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT);
847
848 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
849 }
850}
851
852/* ----- NCI TX CMD worker thread ----- */
853
854static void nci_cmd_work(struct work_struct *work)
855{
856 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
857 struct sk_buff *skb;
858
859 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
860
861 /* Send queued command */
862 if (atomic_read(&ndev->cmd_cnt)) {
863 skb = skb_dequeue(&ndev->cmd_q);
864 if (!skb)
865 return;
866
867 atomic_dec(&ndev->cmd_cnt);
868
869 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
870 nci_pbf(skb->data),
871 nci_opcode_gid(nci_opcode(skb->data)),
872 nci_opcode_oid(nci_opcode(skb->data)),
873 nci_plen(skb->data));
874
875 nci_send_frame(skb);
876
877 mod_timer(&ndev->cmd_timer,
878 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
879 }
880}
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/kernel.h>
32#include <linux/types.h>
33#include <linux/workqueue.h>
34#include <linux/completion.h>
35#include <linux/export.h>
36#include <linux/sched.h>
37#include <linux/bitops.h>
38#include <linux/skbuff.h>
39
40#include "../nfc.h"
41#include <net/nfc/nci.h>
42#include <net/nfc/nci_core.h>
43#include <linux/nfc.h>
44
45struct core_conn_create_data {
46 int length;
47 struct nci_core_conn_create_cmd *cmd;
48};
49
50static void nci_cmd_work(struct work_struct *work);
51static void nci_rx_work(struct work_struct *work);
52static void nci_tx_work(struct work_struct *work);
53
54struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev,
55 int conn_id)
56{
57 struct nci_conn_info *conn_info;
58
59 list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
60 if (conn_info->conn_id == conn_id)
61 return conn_info;
62 }
63
64 return NULL;
65}
66
67int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type,
68 struct dest_spec_params *params)
69{
70 struct nci_conn_info *conn_info;
71
72 list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
73 if (conn_info->dest_type == dest_type) {
74 if (!params)
75 return conn_info->conn_id;
76
77 if (params->id == conn_info->dest_params->id &&
78 params->protocol == conn_info->dest_params->protocol)
79 return conn_info->conn_id;
80 }
81 }
82
83 return -EINVAL;
84}
85EXPORT_SYMBOL(nci_get_conn_info_by_dest_type_params);
86
87/* ---- NCI requests ---- */
88
89void nci_req_complete(struct nci_dev *ndev, int result)
90{
91 if (ndev->req_status == NCI_REQ_PEND) {
92 ndev->req_result = result;
93 ndev->req_status = NCI_REQ_DONE;
94 complete(&ndev->req_completion);
95 }
96}
97EXPORT_SYMBOL(nci_req_complete);
98
99static void nci_req_cancel(struct nci_dev *ndev, int err)
100{
101 if (ndev->req_status == NCI_REQ_PEND) {
102 ndev->req_result = err;
103 ndev->req_status = NCI_REQ_CANCELED;
104 complete(&ndev->req_completion);
105 }
106}
107
108/* Execute request and wait for completion. */
109static int __nci_request(struct nci_dev *ndev,
110 void (*req)(struct nci_dev *ndev, unsigned long opt),
111 unsigned long opt, __u32 timeout)
112{
113 int rc = 0;
114 long completion_rc;
115
116 ndev->req_status = NCI_REQ_PEND;
117
118 reinit_completion(&ndev->req_completion);
119 req(ndev, opt);
120 completion_rc =
121 wait_for_completion_interruptible_timeout(&ndev->req_completion,
122 timeout);
123
124 pr_debug("wait_for_completion return %ld\n", completion_rc);
125
126 if (completion_rc > 0) {
127 switch (ndev->req_status) {
128 case NCI_REQ_DONE:
129 rc = nci_to_errno(ndev->req_result);
130 break;
131
132 case NCI_REQ_CANCELED:
133 rc = -ndev->req_result;
134 break;
135
136 default:
137 rc = -ETIMEDOUT;
138 break;
139 }
140 } else {
141 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
142 completion_rc);
143
144 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
145 }
146
147 ndev->req_status = ndev->req_result = 0;
148
149 return rc;
150}
151
152inline int nci_request(struct nci_dev *ndev,
153 void (*req)(struct nci_dev *ndev,
154 unsigned long opt),
155 unsigned long opt, __u32 timeout)
156{
157 int rc;
158
159 if (!test_bit(NCI_UP, &ndev->flags))
160 return -ENETDOWN;
161
162 /* Serialize all requests */
163 mutex_lock(&ndev->req_lock);
164 rc = __nci_request(ndev, req, opt, timeout);
165 mutex_unlock(&ndev->req_lock);
166
167 return rc;
168}
169
170static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
171{
172 struct nci_core_reset_cmd cmd;
173
174 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
175 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
176}
177
178static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
179{
180 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
181}
182
183static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
184{
185 struct nci_rf_disc_map_cmd cmd;
186 struct disc_map_config *cfg = cmd.mapping_configs;
187 __u8 *num = &cmd.num_mapping_configs;
188 int i;
189
190 /* set rf mapping configurations */
191 *num = 0;
192
193 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
194 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
195 if (ndev->supported_rf_interfaces[i] ==
196 NCI_RF_INTERFACE_ISO_DEP) {
197 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
198 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
199 NCI_DISC_MAP_MODE_LISTEN;
200 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
201 (*num)++;
202 } else if (ndev->supported_rf_interfaces[i] ==
203 NCI_RF_INTERFACE_NFC_DEP) {
204 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
205 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
206 NCI_DISC_MAP_MODE_LISTEN;
207 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
208 (*num)++;
209 }
210
211 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
212 break;
213 }
214
215 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
216 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
217}
218
219struct nci_set_config_param {
220 __u8 id;
221 size_t len;
222 __u8 *val;
223};
224
225static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
226{
227 struct nci_set_config_param *param = (struct nci_set_config_param *)opt;
228 struct nci_core_set_config_cmd cmd;
229
230 BUG_ON(param->len > NCI_MAX_PARAM_LEN);
231
232 cmd.num_params = 1;
233 cmd.param.id = param->id;
234 cmd.param.len = param->len;
235 memcpy(cmd.param.val, param->val, param->len);
236
237 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
238}
239
240struct nci_rf_discover_param {
241 __u32 im_protocols;
242 __u32 tm_protocols;
243};
244
245static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
246{
247 struct nci_rf_discover_param *param =
248 (struct nci_rf_discover_param *)opt;
249 struct nci_rf_disc_cmd cmd;
250
251 cmd.num_disc_configs = 0;
252
253 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
254 (param->im_protocols & NFC_PROTO_JEWEL_MASK ||
255 param->im_protocols & NFC_PROTO_MIFARE_MASK ||
256 param->im_protocols & NFC_PROTO_ISO14443_MASK ||
257 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
258 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
259 NCI_NFC_A_PASSIVE_POLL_MODE;
260 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
261 cmd.num_disc_configs++;
262 }
263
264 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
265 (param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) {
266 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
267 NCI_NFC_B_PASSIVE_POLL_MODE;
268 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
269 cmd.num_disc_configs++;
270 }
271
272 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
273 (param->im_protocols & NFC_PROTO_FELICA_MASK ||
274 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
275 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
276 NCI_NFC_F_PASSIVE_POLL_MODE;
277 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
278 cmd.num_disc_configs++;
279 }
280
281 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
282 (param->im_protocols & NFC_PROTO_ISO15693_MASK)) {
283 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
284 NCI_NFC_V_PASSIVE_POLL_MODE;
285 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
286 cmd.num_disc_configs++;
287 }
288
289 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) &&
290 (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) {
291 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
292 NCI_NFC_A_PASSIVE_LISTEN_MODE;
293 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
294 cmd.num_disc_configs++;
295 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
296 NCI_NFC_F_PASSIVE_LISTEN_MODE;
297 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
298 cmd.num_disc_configs++;
299 }
300
301 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
302 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
303 &cmd);
304}
305
306struct nci_rf_discover_select_param {
307 __u8 rf_discovery_id;
308 __u8 rf_protocol;
309};
310
311static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
312{
313 struct nci_rf_discover_select_param *param =
314 (struct nci_rf_discover_select_param *)opt;
315 struct nci_rf_discover_select_cmd cmd;
316
317 cmd.rf_discovery_id = param->rf_discovery_id;
318 cmd.rf_protocol = param->rf_protocol;
319
320 switch (cmd.rf_protocol) {
321 case NCI_RF_PROTOCOL_ISO_DEP:
322 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
323 break;
324
325 case NCI_RF_PROTOCOL_NFC_DEP:
326 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
327 break;
328
329 default:
330 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
331 break;
332 }
333
334 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
335 sizeof(struct nci_rf_discover_select_cmd), &cmd);
336}
337
338static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
339{
340 struct nci_rf_deactivate_cmd cmd;
341
342 cmd.type = opt;
343
344 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
345 sizeof(struct nci_rf_deactivate_cmd), &cmd);
346}
347
348struct nci_cmd_param {
349 __u16 opcode;
350 size_t len;
351 __u8 *payload;
352};
353
354static void nci_generic_req(struct nci_dev *ndev, unsigned long opt)
355{
356 struct nci_cmd_param *param =
357 (struct nci_cmd_param *)opt;
358
359 nci_send_cmd(ndev, param->opcode, param->len, param->payload);
360}
361
362int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, __u8 *payload)
363{
364 struct nci_cmd_param param;
365
366 param.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, oid);
367 param.len = len;
368 param.payload = payload;
369
370 return __nci_request(ndev, nci_generic_req, (unsigned long)¶m,
371 msecs_to_jiffies(NCI_CMD_TIMEOUT));
372}
373EXPORT_SYMBOL(nci_prop_cmd);
374
375int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len, __u8 *payload)
376{
377 struct nci_cmd_param param;
378
379 param.opcode = opcode;
380 param.len = len;
381 param.payload = payload;
382
383 return __nci_request(ndev, nci_generic_req, (unsigned long)¶m,
384 msecs_to_jiffies(NCI_CMD_TIMEOUT));
385}
386EXPORT_SYMBOL(nci_core_cmd);
387
388int nci_core_reset(struct nci_dev *ndev)
389{
390 return __nci_request(ndev, nci_reset_req, 0,
391 msecs_to_jiffies(NCI_RESET_TIMEOUT));
392}
393EXPORT_SYMBOL(nci_core_reset);
394
395int nci_core_init(struct nci_dev *ndev)
396{
397 return __nci_request(ndev, nci_init_req, 0,
398 msecs_to_jiffies(NCI_INIT_TIMEOUT));
399}
400EXPORT_SYMBOL(nci_core_init);
401
402struct nci_loopback_data {
403 u8 conn_id;
404 struct sk_buff *data;
405};
406
407static void nci_send_data_req(struct nci_dev *ndev, unsigned long opt)
408{
409 struct nci_loopback_data *data = (struct nci_loopback_data *)opt;
410
411 nci_send_data(ndev, data->conn_id, data->data);
412}
413
414static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err)
415{
416 struct nci_dev *ndev = (struct nci_dev *)context;
417 struct nci_conn_info *conn_info;
418
419 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
420 if (!conn_info) {
421 nci_req_complete(ndev, NCI_STATUS_REJECTED);
422 return;
423 }
424
425 conn_info->rx_skb = skb;
426
427 nci_req_complete(ndev, NCI_STATUS_OK);
428}
429
430int nci_nfcc_loopback(struct nci_dev *ndev, void *data, size_t data_len,
431 struct sk_buff **resp)
432{
433 int r;
434 struct nci_loopback_data loopback_data;
435 struct nci_conn_info *conn_info;
436 struct sk_buff *skb;
437 int conn_id = nci_get_conn_info_by_dest_type_params(ndev,
438 NCI_DESTINATION_NFCC_LOOPBACK, NULL);
439
440 if (conn_id < 0) {
441 r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCC_LOOPBACK,
442 0, 0, NULL);
443 if (r != NCI_STATUS_OK)
444 return r;
445
446 conn_id = nci_get_conn_info_by_dest_type_params(ndev,
447 NCI_DESTINATION_NFCC_LOOPBACK,
448 NULL);
449 }
450
451 conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
452 if (!conn_info)
453 return -EPROTO;
454
455 /* store cb and context to be used on receiving data */
456 conn_info->data_exchange_cb = nci_nfcc_loopback_cb;
457 conn_info->data_exchange_cb_context = ndev;
458
459 skb = nci_skb_alloc(ndev, NCI_DATA_HDR_SIZE + data_len, GFP_KERNEL);
460 if (!skb)
461 return -ENOMEM;
462
463 skb_reserve(skb, NCI_DATA_HDR_SIZE);
464 skb_put_data(skb, data, data_len);
465
466 loopback_data.conn_id = conn_id;
467 loopback_data.data = skb;
468
469 ndev->cur_conn_id = conn_id;
470 r = nci_request(ndev, nci_send_data_req, (unsigned long)&loopback_data,
471 msecs_to_jiffies(NCI_DATA_TIMEOUT));
472 if (r == NCI_STATUS_OK && resp)
473 *resp = conn_info->rx_skb;
474
475 return r;
476}
477EXPORT_SYMBOL(nci_nfcc_loopback);
478
479static int nci_open_device(struct nci_dev *ndev)
480{
481 int rc = 0;
482
483 mutex_lock(&ndev->req_lock);
484
485 if (test_bit(NCI_UP, &ndev->flags)) {
486 rc = -EALREADY;
487 goto done;
488 }
489
490 if (ndev->ops->open(ndev)) {
491 rc = -EIO;
492 goto done;
493 }
494
495 atomic_set(&ndev->cmd_cnt, 1);
496
497 set_bit(NCI_INIT, &ndev->flags);
498
499 if (ndev->ops->init)
500 rc = ndev->ops->init(ndev);
501
502 if (!rc) {
503 rc = __nci_request(ndev, nci_reset_req, 0,
504 msecs_to_jiffies(NCI_RESET_TIMEOUT));
505 }
506
507 if (!rc && ndev->ops->setup) {
508 rc = ndev->ops->setup(ndev);
509 }
510
511 if (!rc) {
512 rc = __nci_request(ndev, nci_init_req, 0,
513 msecs_to_jiffies(NCI_INIT_TIMEOUT));
514 }
515
516 if (!rc && ndev->ops->post_setup)
517 rc = ndev->ops->post_setup(ndev);
518
519 if (!rc) {
520 rc = __nci_request(ndev, nci_init_complete_req, 0,
521 msecs_to_jiffies(NCI_INIT_TIMEOUT));
522 }
523
524 clear_bit(NCI_INIT, &ndev->flags);
525
526 if (!rc) {
527 set_bit(NCI_UP, &ndev->flags);
528 nci_clear_target_list(ndev);
529 atomic_set(&ndev->state, NCI_IDLE);
530 } else {
531 /* Init failed, cleanup */
532 skb_queue_purge(&ndev->cmd_q);
533 skb_queue_purge(&ndev->rx_q);
534 skb_queue_purge(&ndev->tx_q);
535
536 ndev->ops->close(ndev);
537 ndev->flags = 0;
538 }
539
540done:
541 mutex_unlock(&ndev->req_lock);
542 return rc;
543}
544
545static int nci_close_device(struct nci_dev *ndev)
546{
547 nci_req_cancel(ndev, ENODEV);
548 mutex_lock(&ndev->req_lock);
549
550 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
551 del_timer_sync(&ndev->cmd_timer);
552 del_timer_sync(&ndev->data_timer);
553 mutex_unlock(&ndev->req_lock);
554 return 0;
555 }
556
557 /* Drop RX and TX queues */
558 skb_queue_purge(&ndev->rx_q);
559 skb_queue_purge(&ndev->tx_q);
560
561 /* Flush RX and TX wq */
562 flush_workqueue(ndev->rx_wq);
563 flush_workqueue(ndev->tx_wq);
564
565 /* Reset device */
566 skb_queue_purge(&ndev->cmd_q);
567 atomic_set(&ndev->cmd_cnt, 1);
568
569 set_bit(NCI_INIT, &ndev->flags);
570 __nci_request(ndev, nci_reset_req, 0,
571 msecs_to_jiffies(NCI_RESET_TIMEOUT));
572
573 /* After this point our queues are empty
574 * and no works are scheduled.
575 */
576 ndev->ops->close(ndev);
577
578 clear_bit(NCI_INIT, &ndev->flags);
579
580 del_timer_sync(&ndev->cmd_timer);
581
582 /* Flush cmd wq */
583 flush_workqueue(ndev->cmd_wq);
584
585 /* Clear flags */
586 ndev->flags = 0;
587
588 mutex_unlock(&ndev->req_lock);
589
590 return 0;
591}
592
593/* NCI command timer function */
594static void nci_cmd_timer(struct timer_list *t)
595{
596 struct nci_dev *ndev = from_timer(ndev, t, cmd_timer);
597
598 atomic_set(&ndev->cmd_cnt, 1);
599 queue_work(ndev->cmd_wq, &ndev->cmd_work);
600}
601
602/* NCI data exchange timer function */
603static void nci_data_timer(struct timer_list *t)
604{
605 struct nci_dev *ndev = from_timer(ndev, t, data_timer);
606
607 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
608 queue_work(ndev->rx_wq, &ndev->rx_work);
609}
610
611static int nci_dev_up(struct nfc_dev *nfc_dev)
612{
613 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
614
615 return nci_open_device(ndev);
616}
617
618static int nci_dev_down(struct nfc_dev *nfc_dev)
619{
620 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
621
622 return nci_close_device(ndev);
623}
624
625int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val)
626{
627 struct nci_set_config_param param;
628
629 if (!val || !len)
630 return 0;
631
632 param.id = id;
633 param.len = len;
634 param.val = val;
635
636 return __nci_request(ndev, nci_set_config_req, (unsigned long)¶m,
637 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
638}
639EXPORT_SYMBOL(nci_set_config);
640
641static void nci_nfcee_discover_req(struct nci_dev *ndev, unsigned long opt)
642{
643 struct nci_nfcee_discover_cmd cmd;
644 __u8 action = opt;
645
646 cmd.discovery_action = action;
647
648 nci_send_cmd(ndev, NCI_OP_NFCEE_DISCOVER_CMD, 1, &cmd);
649}
650
651int nci_nfcee_discover(struct nci_dev *ndev, u8 action)
652{
653 return __nci_request(ndev, nci_nfcee_discover_req, action,
654 msecs_to_jiffies(NCI_CMD_TIMEOUT));
655}
656EXPORT_SYMBOL(nci_nfcee_discover);
657
658static void nci_nfcee_mode_set_req(struct nci_dev *ndev, unsigned long opt)
659{
660 struct nci_nfcee_mode_set_cmd *cmd =
661 (struct nci_nfcee_mode_set_cmd *)opt;
662
663 nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD,
664 sizeof(struct nci_nfcee_mode_set_cmd), cmd);
665}
666
667int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode)
668{
669 struct nci_nfcee_mode_set_cmd cmd;
670
671 cmd.nfcee_id = nfcee_id;
672 cmd.nfcee_mode = nfcee_mode;
673
674 return __nci_request(ndev, nci_nfcee_mode_set_req,
675 (unsigned long)&cmd,
676 msecs_to_jiffies(NCI_CMD_TIMEOUT));
677}
678EXPORT_SYMBOL(nci_nfcee_mode_set);
679
680static void nci_core_conn_create_req(struct nci_dev *ndev, unsigned long opt)
681{
682 struct core_conn_create_data *data =
683 (struct core_conn_create_data *)opt;
684
685 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd);
686}
687
688int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
689 u8 number_destination_params,
690 size_t params_len,
691 struct core_conn_create_dest_spec_params *params)
692{
693 int r;
694 struct nci_core_conn_create_cmd *cmd;
695 struct core_conn_create_data data;
696
697 data.length = params_len + sizeof(struct nci_core_conn_create_cmd);
698 cmd = kzalloc(data.length, GFP_KERNEL);
699 if (!cmd)
700 return -ENOMEM;
701
702 cmd->destination_type = destination_type;
703 cmd->number_destination_params = number_destination_params;
704
705 data.cmd = cmd;
706
707 if (params) {
708 memcpy(cmd->params, params, params_len);
709 if (params->length > 0)
710 memcpy(&ndev->cur_params,
711 ¶ms->value[DEST_SPEC_PARAMS_ID_INDEX],
712 sizeof(struct dest_spec_params));
713 else
714 ndev->cur_params.id = 0;
715 } else {
716 ndev->cur_params.id = 0;
717 }
718 ndev->cur_dest_type = destination_type;
719
720 r = __nci_request(ndev, nci_core_conn_create_req, (unsigned long)&data,
721 msecs_to_jiffies(NCI_CMD_TIMEOUT));
722 kfree(cmd);
723 return r;
724}
725EXPORT_SYMBOL(nci_core_conn_create);
726
727static void nci_core_conn_close_req(struct nci_dev *ndev, unsigned long opt)
728{
729 __u8 conn_id = opt;
730
731 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id);
732}
733
734int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id)
735{
736 ndev->cur_conn_id = conn_id;
737 return __nci_request(ndev, nci_core_conn_close_req, conn_id,
738 msecs_to_jiffies(NCI_CMD_TIMEOUT));
739}
740EXPORT_SYMBOL(nci_core_conn_close);
741
742static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
743{
744 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
745 struct nci_set_config_param param;
746 int rc;
747
748 param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len);
749 if ((param.val == NULL) || (param.len == 0))
750 return 0;
751
752 if (param.len > NFC_MAX_GT_LEN)
753 return -EINVAL;
754
755 param.id = NCI_PN_ATR_REQ_GEN_BYTES;
756
757 rc = nci_request(ndev, nci_set_config_req, (unsigned long)¶m,
758 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
759 if (rc)
760 return rc;
761
762 param.id = NCI_LN_ATR_RES_GEN_BYTES;
763
764 return nci_request(ndev, nci_set_config_req, (unsigned long)¶m,
765 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
766}
767
768static int nci_set_listen_parameters(struct nfc_dev *nfc_dev)
769{
770 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
771 int rc;
772 __u8 val;
773
774 val = NCI_LA_SEL_INFO_NFC_DEP_MASK;
775
776 rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val);
777 if (rc)
778 return rc;
779
780 val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK;
781
782 rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val);
783 if (rc)
784 return rc;
785
786 val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424;
787
788 return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val);
789}
790
791static int nci_start_poll(struct nfc_dev *nfc_dev,
792 __u32 im_protocols, __u32 tm_protocols)
793{
794 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
795 struct nci_rf_discover_param param;
796 int rc;
797
798 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
799 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
800 pr_err("unable to start poll, since poll is already active\n");
801 return -EBUSY;
802 }
803
804 if (ndev->target_active_prot) {
805 pr_err("there is an active target\n");
806 return -EBUSY;
807 }
808
809 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
810 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
811 pr_debug("target active or w4 select, implicitly deactivate\n");
812
813 rc = nci_request(ndev, nci_rf_deactivate_req,
814 NCI_DEACTIVATE_TYPE_IDLE_MODE,
815 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
816 if (rc)
817 return -EBUSY;
818 }
819
820 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
821 rc = nci_set_local_general_bytes(nfc_dev);
822 if (rc) {
823 pr_err("failed to set local general bytes\n");
824 return rc;
825 }
826 }
827
828 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
829 rc = nci_set_listen_parameters(nfc_dev);
830 if (rc)
831 pr_err("failed to set listen parameters\n");
832 }
833
834 param.im_protocols = im_protocols;
835 param.tm_protocols = tm_protocols;
836 rc = nci_request(ndev, nci_rf_discover_req, (unsigned long)¶m,
837 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
838
839 if (!rc)
840 ndev->poll_prots = im_protocols;
841
842 return rc;
843}
844
845static void nci_stop_poll(struct nfc_dev *nfc_dev)
846{
847 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
848
849 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
850 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
851 pr_err("unable to stop poll, since poll is not active\n");
852 return;
853 }
854
855 nci_request(ndev, nci_rf_deactivate_req, NCI_DEACTIVATE_TYPE_IDLE_MODE,
856 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
857}
858
859static int nci_activate_target(struct nfc_dev *nfc_dev,
860 struct nfc_target *target, __u32 protocol)
861{
862 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
863 struct nci_rf_discover_select_param param;
864 struct nfc_target *nci_target = NULL;
865 int i;
866 int rc = 0;
867
868 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
869
870 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
871 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
872 pr_err("there is no available target to activate\n");
873 return -EINVAL;
874 }
875
876 if (ndev->target_active_prot) {
877 pr_err("there is already an active target\n");
878 return -EBUSY;
879 }
880
881 for (i = 0; i < ndev->n_targets; i++) {
882 if (ndev->targets[i].idx == target->idx) {
883 nci_target = &ndev->targets[i];
884 break;
885 }
886 }
887
888 if (!nci_target) {
889 pr_err("unable to find the selected target\n");
890 return -EINVAL;
891 }
892
893 if (!(nci_target->supported_protocols & (1 << protocol))) {
894 pr_err("target does not support the requested protocol 0x%x\n",
895 protocol);
896 return -EINVAL;
897 }
898
899 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
900 param.rf_discovery_id = nci_target->logical_idx;
901
902 if (protocol == NFC_PROTO_JEWEL)
903 param.rf_protocol = NCI_RF_PROTOCOL_T1T;
904 else if (protocol == NFC_PROTO_MIFARE)
905 param.rf_protocol = NCI_RF_PROTOCOL_T2T;
906 else if (protocol == NFC_PROTO_FELICA)
907 param.rf_protocol = NCI_RF_PROTOCOL_T3T;
908 else if (protocol == NFC_PROTO_ISO14443 ||
909 protocol == NFC_PROTO_ISO14443_B)
910 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
911 else
912 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
913
914 rc = nci_request(ndev, nci_rf_discover_select_req,
915 (unsigned long)¶m,
916 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
917 }
918
919 if (!rc)
920 ndev->target_active_prot = protocol;
921
922 return rc;
923}
924
925static void nci_deactivate_target(struct nfc_dev *nfc_dev,
926 struct nfc_target *target,
927 __u8 mode)
928{
929 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
930 u8 nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE;
931
932 pr_debug("entry\n");
933
934 if (!ndev->target_active_prot) {
935 pr_err("unable to deactivate target, no active target\n");
936 return;
937 }
938
939 ndev->target_active_prot = 0;
940
941 switch (mode) {
942 case NFC_TARGET_MODE_SLEEP:
943 nci_mode = NCI_DEACTIVATE_TYPE_SLEEP_MODE;
944 break;
945 }
946
947 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
948 nci_request(ndev, nci_rf_deactivate_req, nci_mode,
949 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
950 }
951}
952
953static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
954 __u8 comm_mode, __u8 *gb, size_t gb_len)
955{
956 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
957 int rc;
958
959 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
960
961 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
962 if (rc)
963 return rc;
964
965 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
966 ndev->remote_gb_len);
967 if (!rc)
968 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
969 NFC_RF_INITIATOR);
970
971 return rc;
972}
973
974static int nci_dep_link_down(struct nfc_dev *nfc_dev)
975{
976 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
977 int rc;
978
979 pr_debug("entry\n");
980
981 if (nfc_dev->rf_mode == NFC_RF_INITIATOR) {
982 nci_deactivate_target(nfc_dev, NULL, NCI_DEACTIVATE_TYPE_IDLE_MODE);
983 } else {
984 if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE ||
985 atomic_read(&ndev->state) == NCI_DISCOVERY) {
986 nci_request(ndev, nci_rf_deactivate_req, 0,
987 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
988 }
989
990 rc = nfc_tm_deactivated(nfc_dev);
991 if (rc)
992 pr_err("error when signaling tm deactivation\n");
993 }
994
995 return 0;
996}
997
998
999static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
1000 struct sk_buff *skb,
1001 data_exchange_cb_t cb, void *cb_context)
1002{
1003 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1004 int rc;
1005 struct nci_conn_info *conn_info;
1006
1007 conn_info = ndev->rf_conn_info;
1008 if (!conn_info)
1009 return -EPROTO;
1010
1011 pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
1012
1013 if (!ndev->target_active_prot) {
1014 pr_err("unable to exchange data, no active target\n");
1015 return -EINVAL;
1016 }
1017
1018 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1019 return -EBUSY;
1020
1021 /* store cb and context to be used on receiving data */
1022 conn_info->data_exchange_cb = cb;
1023 conn_info->data_exchange_cb_context = cb_context;
1024
1025 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1026 if (rc)
1027 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
1028
1029 return rc;
1030}
1031
1032static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
1033{
1034 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1035 int rc;
1036
1037 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1038 if (rc)
1039 pr_err("unable to send data\n");
1040
1041 return rc;
1042}
1043
1044static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1045{
1046 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1047
1048 if (ndev->ops->enable_se)
1049 return ndev->ops->enable_se(ndev, se_idx);
1050
1051 return 0;
1052}
1053
1054static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1055{
1056 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1057
1058 if (ndev->ops->disable_se)
1059 return ndev->ops->disable_se(ndev, se_idx);
1060
1061 return 0;
1062}
1063
1064static int nci_discover_se(struct nfc_dev *nfc_dev)
1065{
1066 int r;
1067 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1068
1069 if (ndev->ops->discover_se) {
1070 r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE);
1071 if (r != NCI_STATUS_OK)
1072 return -EPROTO;
1073
1074 return ndev->ops->discover_se(ndev);
1075 }
1076
1077 return 0;
1078}
1079
1080static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
1081 u8 *apdu, size_t apdu_length,
1082 se_io_cb_t cb, void *cb_context)
1083{
1084 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1085
1086 if (ndev->ops->se_io)
1087 return ndev->ops->se_io(ndev, se_idx, apdu,
1088 apdu_length, cb, cb_context);
1089
1090 return 0;
1091}
1092
1093static int nci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
1094{
1095 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1096
1097 if (!ndev->ops->fw_download)
1098 return -ENOTSUPP;
1099
1100 return ndev->ops->fw_download(ndev, firmware_name);
1101}
1102
1103static struct nfc_ops nci_nfc_ops = {
1104 .dev_up = nci_dev_up,
1105 .dev_down = nci_dev_down,
1106 .start_poll = nci_start_poll,
1107 .stop_poll = nci_stop_poll,
1108 .dep_link_up = nci_dep_link_up,
1109 .dep_link_down = nci_dep_link_down,
1110 .activate_target = nci_activate_target,
1111 .deactivate_target = nci_deactivate_target,
1112 .im_transceive = nci_transceive,
1113 .tm_send = nci_tm_send,
1114 .enable_se = nci_enable_se,
1115 .disable_se = nci_disable_se,
1116 .discover_se = nci_discover_se,
1117 .se_io = nci_se_io,
1118 .fw_download = nci_fw_download,
1119};
1120
1121/* ---- Interface to NCI drivers ---- */
1122/**
1123 * nci_allocate_device - allocate a new nci device
1124 *
1125 * @ops: device operations
1126 * @supported_protocols: NFC protocols supported by the device
1127 */
1128struct nci_dev *nci_allocate_device(struct nci_ops *ops,
1129 __u32 supported_protocols,
1130 int tx_headroom, int tx_tailroom)
1131{
1132 struct nci_dev *ndev;
1133
1134 pr_debug("supported_protocols 0x%x\n", supported_protocols);
1135
1136 if (!ops->open || !ops->close || !ops->send)
1137 return NULL;
1138
1139 if (!supported_protocols)
1140 return NULL;
1141
1142 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
1143 if (!ndev)
1144 return NULL;
1145
1146 ndev->ops = ops;
1147
1148 if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) {
1149 pr_err("Too many proprietary commands: %zd\n",
1150 ops->n_prop_ops);
1151 ops->prop_ops = NULL;
1152 ops->n_prop_ops = 0;
1153 }
1154
1155 ndev->tx_headroom = tx_headroom;
1156 ndev->tx_tailroom = tx_tailroom;
1157 init_completion(&ndev->req_completion);
1158
1159 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
1160 supported_protocols,
1161 tx_headroom + NCI_DATA_HDR_SIZE,
1162 tx_tailroom);
1163 if (!ndev->nfc_dev)
1164 goto free_nci;
1165
1166 ndev->hci_dev = nci_hci_allocate(ndev);
1167 if (!ndev->hci_dev)
1168 goto free_nfc;
1169
1170 nfc_set_drvdata(ndev->nfc_dev, ndev);
1171
1172 return ndev;
1173
1174free_nfc:
1175 nfc_free_device(ndev->nfc_dev);
1176free_nci:
1177 kfree(ndev);
1178 return NULL;
1179}
1180EXPORT_SYMBOL(nci_allocate_device);
1181
1182/**
1183 * nci_free_device - deallocate nci device
1184 *
1185 * @ndev: The nci device to deallocate
1186 */
1187void nci_free_device(struct nci_dev *ndev)
1188{
1189 nfc_free_device(ndev->nfc_dev);
1190 kfree(ndev);
1191}
1192EXPORT_SYMBOL(nci_free_device);
1193
1194/**
1195 * nci_register_device - register a nci device in the nfc subsystem
1196 *
1197 * @dev: The nci device to register
1198 */
1199int nci_register_device(struct nci_dev *ndev)
1200{
1201 int rc;
1202 struct device *dev = &ndev->nfc_dev->dev;
1203 char name[32];
1204
1205 ndev->flags = 0;
1206
1207 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
1208 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
1209 ndev->cmd_wq = create_singlethread_workqueue(name);
1210 if (!ndev->cmd_wq) {
1211 rc = -ENOMEM;
1212 goto exit;
1213 }
1214
1215 INIT_WORK(&ndev->rx_work, nci_rx_work);
1216 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
1217 ndev->rx_wq = create_singlethread_workqueue(name);
1218 if (!ndev->rx_wq) {
1219 rc = -ENOMEM;
1220 goto destroy_cmd_wq_exit;
1221 }
1222
1223 INIT_WORK(&ndev->tx_work, nci_tx_work);
1224 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
1225 ndev->tx_wq = create_singlethread_workqueue(name);
1226 if (!ndev->tx_wq) {
1227 rc = -ENOMEM;
1228 goto destroy_rx_wq_exit;
1229 }
1230
1231 skb_queue_head_init(&ndev->cmd_q);
1232 skb_queue_head_init(&ndev->rx_q);
1233 skb_queue_head_init(&ndev->tx_q);
1234
1235 timer_setup(&ndev->cmd_timer, nci_cmd_timer, 0);
1236 timer_setup(&ndev->data_timer, nci_data_timer, 0);
1237
1238 mutex_init(&ndev->req_lock);
1239 INIT_LIST_HEAD(&ndev->conn_info_list);
1240
1241 rc = nfc_register_device(ndev->nfc_dev);
1242 if (rc)
1243 goto destroy_rx_wq_exit;
1244
1245 goto exit;
1246
1247destroy_rx_wq_exit:
1248 destroy_workqueue(ndev->rx_wq);
1249
1250destroy_cmd_wq_exit:
1251 destroy_workqueue(ndev->cmd_wq);
1252
1253exit:
1254 return rc;
1255}
1256EXPORT_SYMBOL(nci_register_device);
1257
1258/**
1259 * nci_unregister_device - unregister a nci device in the nfc subsystem
1260 *
1261 * @dev: The nci device to unregister
1262 */
1263void nci_unregister_device(struct nci_dev *ndev)
1264{
1265 struct nci_conn_info *conn_info, *n;
1266
1267 nci_close_device(ndev);
1268
1269 destroy_workqueue(ndev->cmd_wq);
1270 destroy_workqueue(ndev->rx_wq);
1271 destroy_workqueue(ndev->tx_wq);
1272
1273 list_for_each_entry_safe(conn_info, n, &ndev->conn_info_list, list) {
1274 list_del(&conn_info->list);
1275 /* conn_info is allocated with devm_kzalloc */
1276 }
1277
1278 nfc_unregister_device(ndev->nfc_dev);
1279}
1280EXPORT_SYMBOL(nci_unregister_device);
1281
1282/**
1283 * nci_recv_frame - receive frame from NCI drivers
1284 *
1285 * @ndev: The nci device
1286 * @skb: The sk_buff to receive
1287 */
1288int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
1289{
1290 pr_debug("len %d\n", skb->len);
1291
1292 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
1293 !test_bit(NCI_INIT, &ndev->flags))) {
1294 kfree_skb(skb);
1295 return -ENXIO;
1296 }
1297
1298 /* Queue frame for rx worker thread */
1299 skb_queue_tail(&ndev->rx_q, skb);
1300 queue_work(ndev->rx_wq, &ndev->rx_work);
1301
1302 return 0;
1303}
1304EXPORT_SYMBOL(nci_recv_frame);
1305
1306int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
1307{
1308 pr_debug("len %d\n", skb->len);
1309
1310 if (!ndev) {
1311 kfree_skb(skb);
1312 return -ENODEV;
1313 }
1314
1315 /* Get rid of skb owner, prior to sending to the driver. */
1316 skb_orphan(skb);
1317
1318 /* Send copy to sniffer */
1319 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1320 RAW_PAYLOAD_NCI, NFC_DIRECTION_TX);
1321
1322 return ndev->ops->send(ndev, skb);
1323}
1324EXPORT_SYMBOL(nci_send_frame);
1325
1326/* Send NCI command */
1327int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
1328{
1329 struct nci_ctrl_hdr *hdr;
1330 struct sk_buff *skb;
1331
1332 pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
1333
1334 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
1335 if (!skb) {
1336 pr_err("no memory for command\n");
1337 return -ENOMEM;
1338 }
1339
1340 hdr = skb_put(skb, NCI_CTRL_HDR_SIZE);
1341 hdr->gid = nci_opcode_gid(opcode);
1342 hdr->oid = nci_opcode_oid(opcode);
1343 hdr->plen = plen;
1344
1345 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
1346 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
1347
1348 if (plen)
1349 skb_put_data(skb, payload, plen);
1350
1351 skb_queue_tail(&ndev->cmd_q, skb);
1352 queue_work(ndev->cmd_wq, &ndev->cmd_work);
1353
1354 return 0;
1355}
1356EXPORT_SYMBOL(nci_send_cmd);
1357
1358/* Proprietary commands API */
1359static struct nci_driver_ops *ops_cmd_lookup(struct nci_driver_ops *ops,
1360 size_t n_ops,
1361 __u16 opcode)
1362{
1363 size_t i;
1364 struct nci_driver_ops *op;
1365
1366 if (!ops || !n_ops)
1367 return NULL;
1368
1369 for (i = 0; i < n_ops; i++) {
1370 op = &ops[i];
1371 if (op->opcode == opcode)
1372 return op;
1373 }
1374
1375 return NULL;
1376}
1377
1378static int nci_op_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode,
1379 struct sk_buff *skb, struct nci_driver_ops *ops,
1380 size_t n_ops)
1381{
1382 struct nci_driver_ops *op;
1383
1384 op = ops_cmd_lookup(ops, n_ops, rsp_opcode);
1385 if (!op || !op->rsp)
1386 return -ENOTSUPP;
1387
1388 return op->rsp(ndev, skb);
1389}
1390
1391static int nci_op_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode,
1392 struct sk_buff *skb, struct nci_driver_ops *ops,
1393 size_t n_ops)
1394{
1395 struct nci_driver_ops *op;
1396
1397 op = ops_cmd_lookup(ops, n_ops, ntf_opcode);
1398 if (!op || !op->ntf)
1399 return -ENOTSUPP;
1400
1401 return op->ntf(ndev, skb);
1402}
1403
1404int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1405 struct sk_buff *skb)
1406{
1407 return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1408 ndev->ops->n_prop_ops);
1409}
1410
1411int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1412 struct sk_buff *skb)
1413{
1414 return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1415 ndev->ops->n_prop_ops);
1416}
1417
1418int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1419 struct sk_buff *skb)
1420{
1421 return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->core_ops,
1422 ndev->ops->n_core_ops);
1423}
1424
1425int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1426 struct sk_buff *skb)
1427{
1428 return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->core_ops,
1429 ndev->ops->n_core_ops);
1430}
1431
1432/* ---- NCI TX Data worker thread ---- */
1433
1434static void nci_tx_work(struct work_struct *work)
1435{
1436 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
1437 struct nci_conn_info *conn_info;
1438 struct sk_buff *skb;
1439
1440 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
1441 if (!conn_info)
1442 return;
1443
1444 pr_debug("credits_cnt %d\n", atomic_read(&conn_info->credits_cnt));
1445
1446 /* Send queued tx data */
1447 while (atomic_read(&conn_info->credits_cnt)) {
1448 skb = skb_dequeue(&ndev->tx_q);
1449 if (!skb)
1450 return;
1451
1452 /* Check if data flow control is used */
1453 if (atomic_read(&conn_info->credits_cnt) !=
1454 NCI_DATA_FLOW_CONTROL_NOT_USED)
1455 atomic_dec(&conn_info->credits_cnt);
1456
1457 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
1458 nci_pbf(skb->data),
1459 nci_conn_id(skb->data),
1460 nci_plen(skb->data));
1461
1462 nci_send_frame(ndev, skb);
1463
1464 mod_timer(&ndev->data_timer,
1465 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
1466 }
1467}
1468
1469/* ----- NCI RX worker thread (data & control) ----- */
1470
1471static void nci_rx_work(struct work_struct *work)
1472{
1473 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
1474 struct sk_buff *skb;
1475
1476 while ((skb = skb_dequeue(&ndev->rx_q))) {
1477
1478 /* Send copy to sniffer */
1479 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1480 RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
1481
1482 /* Process frame */
1483 switch (nci_mt(skb->data)) {
1484 case NCI_MT_RSP_PKT:
1485 nci_rsp_packet(ndev, skb);
1486 break;
1487
1488 case NCI_MT_NTF_PKT:
1489 nci_ntf_packet(ndev, skb);
1490 break;
1491
1492 case NCI_MT_DATA_PKT:
1493 nci_rx_data_packet(ndev, skb);
1494 break;
1495
1496 default:
1497 pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
1498 kfree_skb(skb);
1499 break;
1500 }
1501 }
1502
1503 /* check if a data exchange timout has occurred */
1504 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
1505 /* complete the data exchange transaction, if exists */
1506 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1507 nci_data_exchange_complete(ndev, NULL,
1508 ndev->cur_conn_id,
1509 -ETIMEDOUT);
1510
1511 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
1512 }
1513}
1514
1515/* ----- NCI TX CMD worker thread ----- */
1516
1517static void nci_cmd_work(struct work_struct *work)
1518{
1519 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
1520 struct sk_buff *skb;
1521
1522 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
1523
1524 /* Send queued command */
1525 if (atomic_read(&ndev->cmd_cnt)) {
1526 skb = skb_dequeue(&ndev->cmd_q);
1527 if (!skb)
1528 return;
1529
1530 atomic_dec(&ndev->cmd_cnt);
1531
1532 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
1533 nci_pbf(skb->data),
1534 nci_opcode_gid(nci_opcode(skb->data)),
1535 nci_opcode_oid(nci_opcode(skb->data)),
1536 nci_plen(skb->data));
1537
1538 nci_send_frame(ndev, skb);
1539
1540 mod_timer(&ndev->cmd_timer,
1541 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
1542 }
1543}
1544
1545MODULE_LICENSE("GPL");