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NFC: Core code identation fixes
[deliverable/linux.git] / net / nfc / nci / core.c
CommitLineData
6a2968aa
IE		 1/*
2 * The NFC Controller Interface is the communication protocol between an
3 * NFC Controller (NFCC) and a Device Host (DH).
4 *
5 * Copyright (C) 2011 Texas Instruments, Inc.
6 *
7 * Written by Ilan Elias <ilane@ti.com>
8 *
9 * Acknowledgements:
10 * This file is based on hci_core.c, which was written
11 * by Maxim Krasnyansky.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2
15 * as published by the Free Software Foundation
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 */
27
52858b51 28#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
ed1e0ad8 29
6a2968aa
IE		 30#include <linux/types.h>
31#include <linux/workqueue.h>
32#include <linux/completion.h>
bc3b2d7f 33#include <linux/export.h>
6a2968aa
IE		 34#include <linux/sched.h>
35#include <linux/bitops.h>
36#include <linux/skbuff.h>
37
38#include "../nfc.h"
39#include <net/nfc/nci.h>
40#include <net/nfc/nci_core.h>
41#include <linux/nfc.h>
42
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,
71 __u32 timeout)
72{
73 int rc = 0;
f8c141c3 74 long completion_rc;
6a2968aa
IE		 75
76 ndev->req_status = NCI_REQ_PEND;
77
78 init_completion(&ndev->req_completion);
79 req(ndev, opt);
80 completion_rc = wait_for_completion_interruptible_timeout(
81 &ndev->req_completion,
82 timeout);
83
20c239c1 84 pr_debug("wait_for_completion return %ld\n", completion_rc);
6a2968aa
IE		 85
86 if (completion_rc > 0) {
87 switch (ndev->req_status) {
88 case NCI_REQ_DONE:
89 rc = nci_to_errno(ndev->req_result);
90 break;
91
92 case NCI_REQ_CANCELED:
93 rc = -ndev->req_result;
94 break;
95
96 default:
97 rc = -ETIMEDOUT;
98 break;
99 }
100 } else {
ed1e0ad8
JP		 101 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
102 completion_rc);
6a2968aa
IE		 103
104 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
105 }
106
107 ndev->req_status = ndev->req_result = 0;
108
109 return rc;
110}
111
112static inline int nci_request(struct nci_dev *ndev,
113 void (*req)(struct nci_dev *ndev, 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{
e8c0dacd
IE		 131 struct nci_core_reset_cmd cmd;
132
133 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
134 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
6a2968aa
IE		 135}
136
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{
2eb1dc10
IE		 144 struct nci_rf_disc_map_cmd cmd;
145 struct disc_map_config *cfg = cmd.mapping_configs;
146 __u8 *num = &cmd.num_mapping_configs;
6a2968aa
IE		 147 int i;
148
6a2968aa 149 /* set rf mapping configurations */
2eb1dc10 150 *num = 0;
6a2968aa
IE		 151
152 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
153 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
154 if (ndev->supported_rf_interfaces[i] ==
155 NCI_RF_INTERFACE_ISO_DEP) {
2eb1dc10 156 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
637d85a7
IE		 157 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
158 NCI_DISC_MAP_MODE_LISTEN;
159 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
2eb1dc10 160 (*num)++;
6a2968aa
IE		 161 } else if (ndev->supported_rf_interfaces[i] ==
162 NCI_RF_INTERFACE_NFC_DEP) {
2eb1dc10 163 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
637d85a7
IE		 164 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
165 NCI_DISC_MAP_MODE_LISTEN;
166 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
2eb1dc10 167 (*num)++;
6a2968aa
IE		 168 }
169
2eb1dc10 170 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
6a2968aa
IE		 171 break;
172 }
173
174 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
2eb1dc10 175 (1 + ((*num)*sizeof(struct disc_map_config))),
6a2968aa
IE		 176 &cmd);
177}
178
179static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
180{
181 struct nci_rf_disc_cmd cmd;
182 __u32 protocols = opt;
183
184 cmd.num_disc_configs = 0;
185
186 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
187 (protocols & NFC_PROTO_JEWEL_MASK
188 || protocols & NFC_PROTO_MIFARE_MASK
189 || protocols & NFC_PROTO_ISO14443_MASK
190 || protocols & NFC_PROTO_NFC_DEP_MASK)) {
637d85a7
IE		 191 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
192 NCI_NFC_A_PASSIVE_POLL_MODE;
6a2968aa
IE		 193 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
194 cmd.num_disc_configs++;
195 }
196
197 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
198 (protocols & NFC_PROTO_ISO14443_MASK)) {
637d85a7
IE		 199 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
200 NCI_NFC_B_PASSIVE_POLL_MODE;
6a2968aa
IE		 201 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
202 cmd.num_disc_configs++;
203 }
204
205 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
206 (protocols & NFC_PROTO_FELICA_MASK
207 || protocols & NFC_PROTO_NFC_DEP_MASK)) {
637d85a7
IE		 208 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
209 NCI_NFC_F_PASSIVE_POLL_MODE;
6a2968aa
IE		 210 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
211 cmd.num_disc_configs++;
212 }
213
214 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
215 (1 + (cmd.num_disc_configs*sizeof(struct disc_config))),
216 &cmd);
217}
218
019c4fba
IE		 219struct nci_rf_discover_select_param {
220 __u8 rf_discovery_id;
221 __u8 rf_protocol;
222};
223
224static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
225{
226 struct nci_rf_discover_select_param *param =
227 (struct nci_rf_discover_select_param *)opt;
228 struct nci_rf_discover_select_cmd cmd;
229
230 cmd.rf_discovery_id = param->rf_discovery_id;
231 cmd.rf_protocol = param->rf_protocol;
232
233 switch (cmd.rf_protocol) {
234 case NCI_RF_PROTOCOL_ISO_DEP:
235 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
236 break;
237
238 case NCI_RF_PROTOCOL_NFC_DEP:
239 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
240 break;
241
242 default:
243 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
244 break;
245 }
246
247 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
248 sizeof(struct nci_rf_discover_select_cmd),
249 &cmd);
250}
251
6a2968aa
IE		 252static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
253{
254 struct nci_rf_deactivate_cmd cmd;
255
256 cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
257
258 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
259 sizeof(struct nci_rf_deactivate_cmd),
260 &cmd);
261}
262
263static int nci_open_device(struct nci_dev *ndev)
264{
265 int rc = 0;
266
267 mutex_lock(&ndev->req_lock);
268
269 if (test_bit(NCI_UP, &ndev->flags)) {
270 rc = -EALREADY;
271 goto done;
272 }
273
274 if (ndev->ops->open(ndev)) {
275 rc = -EIO;
276 goto done;
277 }
278
279 atomic_set(&ndev->cmd_cnt, 1);
280
281 set_bit(NCI_INIT, &ndev->flags);
282
283 rc = __nci_request(ndev, nci_reset_req, 0,
284 msecs_to_jiffies(NCI_RESET_TIMEOUT));
285
286 if (!rc) {
287 rc = __nci_request(ndev, nci_init_req, 0,
288 msecs_to_jiffies(NCI_INIT_TIMEOUT));
289 }
290
291 if (!rc) {
292 rc = __nci_request(ndev, nci_init_complete_req, 0,
293 msecs_to_jiffies(NCI_INIT_TIMEOUT));
294 }
295
296 clear_bit(NCI_INIT, &ndev->flags);
297
298 if (!rc) {
299 set_bit(NCI_UP, &ndev->flags);
019c4fba 300 nci_clear_target_list(ndev);
8939e47f 301 atomic_set(&ndev->state, NCI_IDLE);
6a2968aa
IE		 302 } else {
303 /* Init failed, cleanup */
304 skb_queue_purge(&ndev->cmd_q);
305 skb_queue_purge(&ndev->rx_q);
306 skb_queue_purge(&ndev->tx_q);
307
308 ndev->ops->close(ndev);
309 ndev->flags = 0;
310 }
311
312done:
313 mutex_unlock(&ndev->req_lock);
314 return rc;
315}
316
317static int nci_close_device(struct nci_dev *ndev)
318{
319 nci_req_cancel(ndev, ENODEV);
320 mutex_lock(&ndev->req_lock);
321
322 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
323 del_timer_sync(&ndev->cmd_timer);
c4bf98b2 324 del_timer_sync(&ndev->data_timer);
6a2968aa
IE		 325 mutex_unlock(&ndev->req_lock);
326 return 0;
327 }
328
329 /* Drop RX and TX queues */
330 skb_queue_purge(&ndev->rx_q);
331 skb_queue_purge(&ndev->tx_q);
332
333 /* Flush RX and TX wq */
334 flush_workqueue(ndev->rx_wq);
335 flush_workqueue(ndev->tx_wq);
336
337 /* Reset device */
338 skb_queue_purge(&ndev->cmd_q);
339 atomic_set(&ndev->cmd_cnt, 1);
340
341 set_bit(NCI_INIT, &ndev->flags);
342 __nci_request(ndev, nci_reset_req, 0,
343 msecs_to_jiffies(NCI_RESET_TIMEOUT));
344 clear_bit(NCI_INIT, &ndev->flags);
345
346 /* Flush cmd wq */
347 flush_workqueue(ndev->cmd_wq);
348
349 /* After this point our queues are empty
350 * and no works are scheduled. */
351 ndev->ops->close(ndev);
352
353 /* Clear flags */
354 ndev->flags = 0;
355
356 mutex_unlock(&ndev->req_lock);
357
358 return 0;
359}
360
361/* NCI command timer function */
362static void nci_cmd_timer(unsigned long arg)
363{
364 struct nci_dev *ndev = (void *) arg;
365
6a2968aa
IE		 366 atomic_set(&ndev->cmd_cnt, 1);
367 queue_work(ndev->cmd_wq, &ndev->cmd_work);
368}
369
c4bf98b2
IE		 370/* NCI data exchange timer function */
371static void nci_data_timer(unsigned long arg)
372{
373 struct nci_dev *ndev = (void *) arg;
374
375 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
376 queue_work(ndev->rx_wq, &ndev->rx_work);
377}
378
6a2968aa
IE		 379static int nci_dev_up(struct nfc_dev *nfc_dev)
380{
381 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
382
6a2968aa
IE		 383 return nci_open_device(ndev);
384}
385
386static int nci_dev_down(struct nfc_dev *nfc_dev)
387{
388 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
389
6a2968aa
IE		 390 return nci_close_device(ndev);
391}
392
393static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols)
394{
395 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
396 int rc;
397
019c4fba
IE		 398 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
399 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
ed1e0ad8 400 pr_err("unable to start poll, since poll is already active\n");
6a2968aa
IE		 401 return -EBUSY;
402 }
403
de054799 404 if (ndev->target_active_prot) {
ed1e0ad8 405 pr_err("there is an active target\n");
de054799
IE		 406 return -EBUSY;
407 }
408
019c4fba
IE		 409 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
410 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
411 pr_debug("target active or w4 select, implicitly deactivate\n");
6a2968aa
IE		 412
413 rc = nci_request(ndev, nci_rf_deactivate_req, 0,
414 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
415 if (rc)
416 return -EBUSY;
417 }
418
419 rc = nci_request(ndev, nci_rf_discover_req, protocols,
420 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
421
422 if (!rc)
423 ndev->poll_prots = protocols;
424
425 return rc;
426}
427
428static void nci_stop_poll(struct nfc_dev *nfc_dev)
429{
430 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
431
019c4fba
IE		 432 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
433 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
ed1e0ad8 434 pr_err("unable to stop poll, since poll is not active\n");
6a2968aa
IE		 435 return;
436 }
437
438 nci_request(ndev, nci_rf_deactivate_req, 0,
439 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
440}
441
442static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx,
443 __u32 protocol)
444{
445 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
019c4fba 446 struct nci_rf_discover_select_param param;
6269cc83 447 struct nfc_target *target = NULL;
019c4fba
IE		 448 int i;
449 int rc = 0;
6a2968aa 450
24bf3304 451 pr_debug("target_idx %d, protocol 0x%x\n", target_idx, protocol);
6a2968aa 452
019c4fba
IE		 453 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
454 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
ed1e0ad8 455 pr_err("there is no available target to activate\n");
6a2968aa
IE		 456 return -EINVAL;
457 }
458
459 if (ndev->target_active_prot) {
ed1e0ad8 460 pr_err("there is already an active target\n");
6a2968aa
IE		 461 return -EBUSY;
462 }
463
019c4fba
IE		 464 for (i = 0; i < ndev->n_targets; i++) {
465 if (ndev->targets[i].idx == target_idx) {
466 target = &ndev->targets[i];
467 break;
468 }
469 }
470
471 if (!target) {
472 pr_err("unable to find the selected target\n");
473 return -EINVAL;
474 }
475
476 if (!(target->supported_protocols & (1 << protocol))) {
ed1e0ad8
JP		 477 pr_err("target does not support the requested protocol 0x%x\n",
478 protocol);
6a2968aa
IE		 479 return -EINVAL;
480 }
481
019c4fba
IE		 482 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
483 param.rf_discovery_id = target->idx;
484
485 if (protocol == NFC_PROTO_JEWEL)
486 param.rf_protocol = NCI_RF_PROTOCOL_T1T;
487 else if (protocol == NFC_PROTO_MIFARE)
488 param.rf_protocol = NCI_RF_PROTOCOL_T2T;
489 else if (protocol == NFC_PROTO_FELICA)
490 param.rf_protocol = NCI_RF_PROTOCOL_T3T;
491 else if (protocol == NFC_PROTO_ISO14443)
492 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
493 else
494 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
495
496 rc = nci_request(ndev, nci_rf_discover_select_req,
497 (unsigned long)&param,
498 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
499 }
6a2968aa 500
019c4fba
IE		 501 if (!rc)
502 ndev->target_active_prot = protocol;
503
504 return rc;
6a2968aa
IE		 505}
506
507static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx)
508{
509 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
510
24bf3304 511 pr_debug("target_idx %d\n", target_idx);
6a2968aa
IE		 512
513 if (!ndev->target_active_prot) {
ed1e0ad8 514 pr_err("unable to deactivate target, no active target\n");
6a2968aa
IE		 515 return;
516 }
517
518 ndev->target_active_prot = 0;
519
8939e47f 520 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
6a2968aa
IE		 521 nci_request(ndev, nci_rf_deactivate_req, 0,
522 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
523 }
524}
525
526static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx,
527 struct sk_buff *skb,
528 data_exchange_cb_t cb,
529 void *cb_context)
530{
531 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
38f04c6b 532 int rc;
6a2968aa 533
24bf3304 534 pr_debug("target_idx %d, len %d\n", target_idx, skb->len);
6a2968aa
IE		 535
536 if (!ndev->target_active_prot) {
ed1e0ad8 537 pr_err("unable to exchange data, no active target\n");
6a2968aa
IE		 538 return -EINVAL;
539 }
540
38f04c6b
IE		 541 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
542 return -EBUSY;
543
6a2968aa
IE		 544 /* store cb and context to be used on receiving data */
545 ndev->data_exchange_cb = cb;
546 ndev->data_exchange_cb_context = cb_context;
547
e8c0dacd 548 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
38f04c6b
IE		 549 if (rc)
550 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
551
552 return rc;
6a2968aa
IE		 553}
554
555static struct nfc_ops nci_nfc_ops = {
556 .dev_up = nci_dev_up,
557 .dev_down = nci_dev_down,
558 .start_poll = nci_start_poll,
559 .stop_poll = nci_stop_poll,
560 .activate_target = nci_activate_target,
561 .deactivate_target = nci_deactivate_target,
562 .data_exchange = nci_data_exchange,
563};
564
565/* ---- Interface to NCI drivers ---- */
566
567/**
568 * nci_allocate_device - allocate a new nci device
569 *
570 * @ops: device operations
571 * @supported_protocols: NFC protocols supported by the device
572 */
573struct nci_dev *nci_allocate_device(struct nci_ops *ops,
574 __u32 supported_protocols,
575 int tx_headroom,
576 int tx_tailroom)
577{
8ebafde0 578 struct nci_dev *ndev;
6a2968aa 579
24bf3304 580 pr_debug("supported_protocols 0x%x\n", supported_protocols);
6a2968aa
IE		 581
582 if (!ops->open || !ops->close || !ops->send)
8ebafde0 583 return NULL;
6a2968aa
IE		 584
585 if (!supported_protocols)
8ebafde0 586 return NULL;
6a2968aa
IE		 587
588 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
589 if (!ndev)
8ebafde0 590 return NULL;
6a2968aa
IE		 591
592 ndev->ops = ops;
593 ndev->tx_headroom = tx_headroom;
594 ndev->tx_tailroom = tx_tailroom;
595
596 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
597 supported_protocols,
598 tx_headroom + NCI_DATA_HDR_SIZE,
599 tx_tailroom);
600 if (!ndev->nfc_dev)
601 goto free_exit;
602
603 nfc_set_drvdata(ndev->nfc_dev, ndev);
604
8ebafde0 605 return ndev;
6a2968aa
IE		 606
607free_exit:
608 kfree(ndev);
8ebafde0 609 return NULL;
6a2968aa
IE		 610}
611EXPORT_SYMBOL(nci_allocate_device);
612
613/**
614 * nci_free_device - deallocate nci device
615 *
616 * @ndev: The nci device to deallocate
617 */
618void nci_free_device(struct nci_dev *ndev)
619{
6a2968aa
IE		 620 nfc_free_device(ndev->nfc_dev);
621 kfree(ndev);
622}
623EXPORT_SYMBOL(nci_free_device);
624
625/**
626 * nci_register_device - register a nci device in the nfc subsystem
627 *
628 * @dev: The nci device to register
629 */
630int nci_register_device(struct nci_dev *ndev)
631{
632 int rc;
633 struct device *dev = &ndev->nfc_dev->dev;
634 char name[32];
635
6a2968aa
IE		 636 rc = nfc_register_device(ndev->nfc_dev);
637 if (rc)
638 goto exit;
639
640 ndev->flags = 0;
641
642 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
643 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
644 ndev->cmd_wq = create_singlethread_workqueue(name);
645 if (!ndev->cmd_wq) {
646 rc = -ENOMEM;
647 goto unreg_exit;
648 }
649
650 INIT_WORK(&ndev->rx_work, nci_rx_work);
651 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
652 ndev->rx_wq = create_singlethread_workqueue(name);
653 if (!ndev->rx_wq) {
654 rc = -ENOMEM;
655 goto destroy_cmd_wq_exit;
656 }
657
658 INIT_WORK(&ndev->tx_work, nci_tx_work);
659 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
660 ndev->tx_wq = create_singlethread_workqueue(name);
661 if (!ndev->tx_wq) {
662 rc = -ENOMEM;
663 goto destroy_rx_wq_exit;
664 }
665
666 skb_queue_head_init(&ndev->cmd_q);
667 skb_queue_head_init(&ndev->rx_q);
668 skb_queue_head_init(&ndev->tx_q);
669
670 setup_timer(&ndev->cmd_timer, nci_cmd_timer,
671 (unsigned long) ndev);
c4bf98b2
IE		 672 setup_timer(&ndev->data_timer, nci_data_timer,
673 (unsigned long) ndev);
6a2968aa
IE		 674
675 mutex_init(&ndev->req_lock);
676
677 goto exit;
678
679destroy_rx_wq_exit:
680 destroy_workqueue(ndev->rx_wq);
681
682destroy_cmd_wq_exit:
683 destroy_workqueue(ndev->cmd_wq);
684
685unreg_exit:
686 nfc_unregister_device(ndev->nfc_dev);
687
688exit:
689 return rc;
690}
691EXPORT_SYMBOL(nci_register_device);
692
693/**
694 * nci_unregister_device - unregister a nci device in the nfc subsystem
695 *
696 * @dev: The nci device to unregister
697 */
698void nci_unregister_device(struct nci_dev *ndev)
699{
6a2968aa
IE		 700 nci_close_device(ndev);
701
702 destroy_workqueue(ndev->cmd_wq);
703 destroy_workqueue(ndev->rx_wq);
704 destroy_workqueue(ndev->tx_wq);
705
706 nfc_unregister_device(ndev->nfc_dev);
707}
708EXPORT_SYMBOL(nci_unregister_device);
709
710/**
711 * nci_recv_frame - receive frame from NCI drivers
712 *
713 * @skb: The sk_buff to receive
714 */
715int nci_recv_frame(struct sk_buff *skb)
716{
717 struct nci_dev *ndev = (struct nci_dev *) skb->dev;
718
24bf3304 719 pr_debug("len %d\n", skb->len);
6a2968aa
IE		 720
721 if (!ndev || (!test_bit(NCI_UP, &ndev->flags)
722 && !test_bit(NCI_INIT, &ndev->flags))) {
723 kfree_skb(skb);
724 return -ENXIO;
725 }
726
727 /* Queue frame for rx worker thread */
728 skb_queue_tail(&ndev->rx_q, skb);
729 queue_work(ndev->rx_wq, &ndev->rx_work);
730
731 return 0;
732}
733EXPORT_SYMBOL(nci_recv_frame);
734
735static int nci_send_frame(struct sk_buff *skb)
736{
737 struct nci_dev *ndev = (struct nci_dev *) skb->dev;
738
24bf3304 739 pr_debug("len %d\n", skb->len);
6a2968aa
IE		 740
741 if (!ndev) {
742 kfree_skb(skb);
743 return -ENODEV;
744 }
745
746 /* Get rid of skb owner, prior to sending to the driver. */
747 skb_orphan(skb);
748
749 return ndev->ops->send(skb);
750}
751
752/* Send NCI command */
753int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
754{
755 struct nci_ctrl_hdr *hdr;
756 struct sk_buff *skb;
757
24bf3304 758 pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
6a2968aa
IE		 759
760 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
761 if (!skb) {
ed1e0ad8 762 pr_err("no memory for command\n");
6a2968aa
IE		 763 return -ENOMEM;
764 }
765
766 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
767 hdr->gid = nci_opcode_gid(opcode);
768 hdr->oid = nci_opcode_oid(opcode);
769 hdr->plen = plen;
770
771 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
772 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
773
774 if (plen)
775 memcpy(skb_put(skb, plen), payload, plen);
776
777 skb->dev = (void *) ndev;
778
779 skb_queue_tail(&ndev->cmd_q, skb);
780 queue_work(ndev->cmd_wq, &ndev->cmd_work);
781
782 return 0;
783}
784
785/* ---- NCI TX Data worker thread ---- */
786
787static void nci_tx_work(struct work_struct *work)
788{
789 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
790 struct sk_buff *skb;
791
24bf3304 792 pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt));
6a2968aa
IE		 793
794 /* Send queued tx data */
795 while (atomic_read(&ndev->credits_cnt)) {
796 skb = skb_dequeue(&ndev->tx_q);
797 if (!skb)
798 return;
799
db98c829
IE		 800 /* Check if data flow control is used */
801 if (atomic_read(&ndev->credits_cnt) !=
802 NCI_DATA_FLOW_CONTROL_NOT_USED)
803 atomic_dec(&ndev->credits_cnt);
6a2968aa 804
20c239c1
JP		 805 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
806 nci_pbf(skb->data),
807 nci_conn_id(skb->data),
808 nci_plen(skb->data));
6a2968aa
IE		 809
810 nci_send_frame(skb);
c4bf98b2
IE		 811
812 mod_timer(&ndev->data_timer,
813 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
6a2968aa
IE		 814 }
815}
816
817/* ----- NCI RX worker thread (data & control) ----- */
818
819static void nci_rx_work(struct work_struct *work)
820{
821 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
822 struct sk_buff *skb;
823
824 while ((skb = skb_dequeue(&ndev->rx_q))) {
825 /* Process frame */
826 switch (nci_mt(skb->data)) {
827 case NCI_MT_RSP_PKT:
828 nci_rsp_packet(ndev, skb);
829 break;
830
831 case NCI_MT_NTF_PKT:
832 nci_ntf_packet(ndev, skb);
833 break;
834
835 case NCI_MT_DATA_PKT:
836 nci_rx_data_packet(ndev, skb);
837 break;
838
839 default:
ed1e0ad8 840 pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
6a2968aa
IE		 841 kfree_skb(skb);
842 break;
843 }
844 }
c4bf98b2
IE		 845
846 /* check if a data exchange timout has occurred */
847 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
848 /* complete the data exchange transaction, if exists */
849 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
850 nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT);
851
852 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
853 }
6a2968aa
IE		 854}
855
856/* ----- NCI TX CMD worker thread ----- */
857
858static void nci_cmd_work(struct work_struct *work)
859{
860 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
861 struct sk_buff *skb;
862
24bf3304 863 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
6a2968aa
IE		 864
865 /* Send queued command */
866 if (atomic_read(&ndev->cmd_cnt)) {
867 skb = skb_dequeue(&ndev->cmd_q);
868 if (!skb)
869 return;
870
871 atomic_dec(&ndev->cmd_cnt);
872
20c239c1
JP		 873 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
874 nci_pbf(skb->data),
875 nci_opcode_gid(nci_opcode(skb->data)),
876 nci_opcode_oid(nci_opcode(skb->data)),
877 nci_plen(skb->data));
6a2968aa
IE		 878
879 nci_send_frame(skb);
880
881 mod_timer(&ndev->cmd_timer,
882 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
883 }
884}
Linux kernel - Deliverables
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