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net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules
[linux-2.6-block.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
28#include <linux/types.h>
29#include <linux/workqueue.h>
30#include <linux/completion.h>
bc3b2d7f 31#include <linux/export.h>
6a2968aa
IE		 32#include <linux/sched.h>
33#include <linux/bitops.h>
34#include <linux/skbuff.h>
35
36#include "../nfc.h"
37#include <net/nfc/nci.h>
38#include <net/nfc/nci_core.h>
39#include <linux/nfc.h>
40
41static void nci_cmd_work(struct work_struct *work);
42static void nci_rx_work(struct work_struct *work);
43static void nci_tx_work(struct work_struct *work);
44
45/* ---- NCI requests ---- */
46
47void nci_req_complete(struct nci_dev *ndev, int result)
48{
49 if (ndev->req_status == NCI_REQ_PEND) {
50 ndev->req_result = result;
51 ndev->req_status = NCI_REQ_DONE;
52 complete(&ndev->req_completion);
53 }
54}
55
56static void nci_req_cancel(struct nci_dev *ndev, int err)
57{
58 if (ndev->req_status == NCI_REQ_PEND) {
59 ndev->req_result = err;
60 ndev->req_status = NCI_REQ_CANCELED;
61 complete(&ndev->req_completion);
62 }
63}
64
65/* Execute request and wait for completion. */
66static int __nci_request(struct nci_dev *ndev,
67 void (*req)(struct nci_dev *ndev, unsigned long opt),
68 unsigned long opt,
69 __u32 timeout)
70{
71 int rc = 0;
72 unsigned long completion_rc;
73
74 ndev->req_status = NCI_REQ_PEND;
75
76 init_completion(&ndev->req_completion);
77 req(ndev, opt);
78 completion_rc = wait_for_completion_interruptible_timeout(
79 &ndev->req_completion,
80 timeout);
81
82 nfc_dbg("wait_for_completion return %ld", completion_rc);
83
84 if (completion_rc > 0) {
85 switch (ndev->req_status) {
86 case NCI_REQ_DONE:
87 rc = nci_to_errno(ndev->req_result);
88 break;
89
90 case NCI_REQ_CANCELED:
91 rc = -ndev->req_result;
92 break;
93
94 default:
95 rc = -ETIMEDOUT;
96 break;
97 }
98 } else {
99 nfc_err("wait_for_completion_interruptible_timeout failed %ld",
100 completion_rc);
101
102 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
103 }
104
105 ndev->req_status = ndev->req_result = 0;
106
107 return rc;
108}
109
110static inline int nci_request(struct nci_dev *ndev,
111 void (*req)(struct nci_dev *ndev, unsigned long opt),
112 unsigned long opt, __u32 timeout)
113{
114 int rc;
115
116 if (!test_bit(NCI_UP, &ndev->flags))
117 return -ENETDOWN;
118
119 /* Serialize all requests */
120 mutex_lock(&ndev->req_lock);
121 rc = __nci_request(ndev, req, opt, timeout);
122 mutex_unlock(&ndev->req_lock);
123
124 return rc;
125}
126
127static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
128{
129 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 0, NULL);
130}
131
132static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
133{
134 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
135}
136
137static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
138{
6a2968aa 139 struct nci_core_conn_create_cmd conn_cmd;
2eb1dc10
IE		 140 struct nci_rf_disc_map_cmd cmd;
141 struct disc_map_config *cfg = cmd.mapping_configs;
142 __u8 *num = &cmd.num_mapping_configs;
6a2968aa
IE		 143 int i;
144
145 /* create static rf connection */
146 conn_cmd.target_handle = 0;
147 conn_cmd.num_target_specific_params = 0;
148 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, 2, &conn_cmd);
149
150 /* set rf mapping configurations */
2eb1dc10 151 *num = 0;
6a2968aa
IE		 152
153 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
154 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
155 if (ndev->supported_rf_interfaces[i] ==
156 NCI_RF_INTERFACE_ISO_DEP) {
2eb1dc10
IE		 157 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
158 cfg[*num].mode = NCI_DISC_MAP_MODE_BOTH;
159 cfg[*num].rf_interface_type = NCI_RF_INTERFACE_ISO_DEP;
160 (*num)++;
6a2968aa
IE		 161 } else if (ndev->supported_rf_interfaces[i] ==
162 NCI_RF_INTERFACE_NFC_DEP) {
2eb1dc10
IE		 163 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
164 cfg[*num].mode = NCI_DISC_MAP_MODE_BOTH;
165 cfg[*num].rf_interface_type = NCI_RF_INTERFACE_NFC_DEP;
166 (*num)++;
6a2968aa
IE		 167 }
168
2eb1dc10 169 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
6a2968aa
IE		 170 break;
171 }
172
173 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
2eb1dc10 174 (1 + ((*num)*sizeof(struct disc_map_config))),
6a2968aa
IE		 175 &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].type =
191 NCI_DISCOVERY_TYPE_POLL_A_PASSIVE;
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].type =
199 NCI_DISCOVERY_TYPE_POLL_B_PASSIVE;
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].type =
208 NCI_DISCOVERY_TYPE_POLL_F_PASSIVE;
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
218static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
219{
220 struct nci_rf_deactivate_cmd cmd;
221
222 cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
223
224 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
225 sizeof(struct nci_rf_deactivate_cmd),
226 &cmd);
227}
228
229static int nci_open_device(struct nci_dev *ndev)
230{
231 int rc = 0;
232
233 mutex_lock(&ndev->req_lock);
234
235 if (test_bit(NCI_UP, &ndev->flags)) {
236 rc = -EALREADY;
237 goto done;
238 }
239
240 if (ndev->ops->open(ndev)) {
241 rc = -EIO;
242 goto done;
243 }
244
245 atomic_set(&ndev->cmd_cnt, 1);
246
247 set_bit(NCI_INIT, &ndev->flags);
248
249 rc = __nci_request(ndev, nci_reset_req, 0,
250 msecs_to_jiffies(NCI_RESET_TIMEOUT));
251
252 if (!rc) {
253 rc = __nci_request(ndev, nci_init_req, 0,
254 msecs_to_jiffies(NCI_INIT_TIMEOUT));
255 }
256
257 if (!rc) {
258 rc = __nci_request(ndev, nci_init_complete_req, 0,
259 msecs_to_jiffies(NCI_INIT_TIMEOUT));
260 }
261
262 clear_bit(NCI_INIT, &ndev->flags);
263
264 if (!rc) {
265 set_bit(NCI_UP, &ndev->flags);
266 } else {
267 /* Init failed, cleanup */
268 skb_queue_purge(&ndev->cmd_q);
269 skb_queue_purge(&ndev->rx_q);
270 skb_queue_purge(&ndev->tx_q);
271
272 ndev->ops->close(ndev);
273 ndev->flags = 0;
274 }
275
276done:
277 mutex_unlock(&ndev->req_lock);
278 return rc;
279}
280
281static int nci_close_device(struct nci_dev *ndev)
282{
283 nci_req_cancel(ndev, ENODEV);
284 mutex_lock(&ndev->req_lock);
285
286 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
287 del_timer_sync(&ndev->cmd_timer);
288 mutex_unlock(&ndev->req_lock);
289 return 0;
290 }
291
292 /* Drop RX and TX queues */
293 skb_queue_purge(&ndev->rx_q);
294 skb_queue_purge(&ndev->tx_q);
295
296 /* Flush RX and TX wq */
297 flush_workqueue(ndev->rx_wq);
298 flush_workqueue(ndev->tx_wq);
299
300 /* Reset device */
301 skb_queue_purge(&ndev->cmd_q);
302 atomic_set(&ndev->cmd_cnt, 1);
303
304 set_bit(NCI_INIT, &ndev->flags);
305 __nci_request(ndev, nci_reset_req, 0,
306 msecs_to_jiffies(NCI_RESET_TIMEOUT));
307 clear_bit(NCI_INIT, &ndev->flags);
308
309 /* Flush cmd wq */
310 flush_workqueue(ndev->cmd_wq);
311
312 /* After this point our queues are empty
313 * and no works are scheduled. */
314 ndev->ops->close(ndev);
315
316 /* Clear flags */
317 ndev->flags = 0;
318
319 mutex_unlock(&ndev->req_lock);
320
321 return 0;
322}
323
324/* NCI command timer function */
325static void nci_cmd_timer(unsigned long arg)
326{
327 struct nci_dev *ndev = (void *) arg;
328
329 nfc_dbg("entry");
330
331 atomic_set(&ndev->cmd_cnt, 1);
332 queue_work(ndev->cmd_wq, &ndev->cmd_work);
333}
334
335static int nci_dev_up(struct nfc_dev *nfc_dev)
336{
337 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
338
339 nfc_dbg("entry");
340
341 return nci_open_device(ndev);
342}
343
344static int nci_dev_down(struct nfc_dev *nfc_dev)
345{
346 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
347
348 nfc_dbg("entry");
349
350 return nci_close_device(ndev);
351}
352
353static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols)
354{
355 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
356 int rc;
357
358 nfc_dbg("entry");
359
360 if (test_bit(NCI_DISCOVERY, &ndev->flags)) {
361 nfc_err("unable to start poll, since poll is already active");
362 return -EBUSY;
363 }
364
de054799
IE		 365 if (ndev->target_active_prot) {
366 nfc_err("there is an active target");
367 return -EBUSY;
368 }
369
6a2968aa 370 if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
de054799 371 nfc_dbg("target is active, implicitly deactivate...");
6a2968aa
IE		 372
373 rc = nci_request(ndev, nci_rf_deactivate_req, 0,
374 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
375 if (rc)
376 return -EBUSY;
377 }
378
379 rc = nci_request(ndev, nci_rf_discover_req, protocols,
380 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
381
382 if (!rc)
383 ndev->poll_prots = protocols;
384
385 return rc;
386}
387
388static void nci_stop_poll(struct nfc_dev *nfc_dev)
389{
390 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
391
392 nfc_dbg("entry");
393
394 if (!test_bit(NCI_DISCOVERY, &ndev->flags)) {
395 nfc_err("unable to stop poll, since poll is not active");
396 return;
397 }
398
399 nci_request(ndev, nci_rf_deactivate_req, 0,
400 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
401}
402
403static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx,
404 __u32 protocol)
405{
406 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
407
408 nfc_dbg("entry, target_idx %d, protocol 0x%x", target_idx, protocol);
409
410 if (!test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
411 nfc_err("there is no available target to activate");
412 return -EINVAL;
413 }
414
415 if (ndev->target_active_prot) {
416 nfc_err("there is already an active target");
417 return -EBUSY;
418 }
419
420 if (!(ndev->target_available_prots & (1 << protocol))) {
421 nfc_err("target does not support the requested protocol 0x%x",
422 protocol);
423 return -EINVAL;
424 }
425
426 ndev->target_active_prot = protocol;
427 ndev->target_available_prots = 0;
428
429 return 0;
430}
431
432static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx)
433{
434 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
435
436 nfc_dbg("entry, target_idx %d", target_idx);
437
438 if (!ndev->target_active_prot) {
439 nfc_err("unable to deactivate target, no active target");
440 return;
441 }
442
443 ndev->target_active_prot = 0;
444
445 if (test_bit(NCI_POLL_ACTIVE, &ndev->flags)) {
446 nci_request(ndev, nci_rf_deactivate_req, 0,
447 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
448 }
449}
450
451static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx,
452 struct sk_buff *skb,
453 data_exchange_cb_t cb,
454 void *cb_context)
455{
456 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
38f04c6b 457 int rc;
6a2968aa
IE		 458
459 nfc_dbg("entry, target_idx %d, len %d", target_idx, skb->len);
460
461 if (!ndev->target_active_prot) {
462 nfc_err("unable to exchange data, no active target");
463 return -EINVAL;
464 }
465
38f04c6b
IE		 466 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
467 return -EBUSY;
468
6a2968aa
IE		 469 /* store cb and context to be used on receiving data */
470 ndev->data_exchange_cb = cb;
471 ndev->data_exchange_cb_context = cb_context;
472
38f04c6b
IE		 473 rc = nci_send_data(ndev, ndev->conn_id, skb);
474 if (rc)
475 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
476
477 return rc;
6a2968aa
IE		 478}
479
480static struct nfc_ops nci_nfc_ops = {
481 .dev_up = nci_dev_up,
482 .dev_down = nci_dev_down,
483 .start_poll = nci_start_poll,
484 .stop_poll = nci_stop_poll,
485 .activate_target = nci_activate_target,
486 .deactivate_target = nci_deactivate_target,
487 .data_exchange = nci_data_exchange,
488};
489
490/* ---- Interface to NCI drivers ---- */
491
492/**
493 * nci_allocate_device - allocate a new nci device
494 *
495 * @ops: device operations
496 * @supported_protocols: NFC protocols supported by the device
497 */
498struct nci_dev *nci_allocate_device(struct nci_ops *ops,
499 __u32 supported_protocols,
500 int tx_headroom,
501 int tx_tailroom)
502{
8ebafde0 503 struct nci_dev *ndev;
6a2968aa
IE		 504
505 nfc_dbg("entry, supported_protocols 0x%x", supported_protocols);
506
507 if (!ops->open || !ops->close || !ops->send)
8ebafde0 508 return NULL;
6a2968aa
IE		 509
510 if (!supported_protocols)
8ebafde0 511 return NULL;
6a2968aa
IE		 512
513 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
514 if (!ndev)
8ebafde0 515 return NULL;
6a2968aa
IE		 516
517 ndev->ops = ops;
518 ndev->tx_headroom = tx_headroom;
519 ndev->tx_tailroom = tx_tailroom;
520
521 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
522 supported_protocols,
523 tx_headroom + NCI_DATA_HDR_SIZE,
524 tx_tailroom);
525 if (!ndev->nfc_dev)
526 goto free_exit;
527
528 nfc_set_drvdata(ndev->nfc_dev, ndev);
529
8ebafde0 530 return ndev;
6a2968aa
IE		 531
532free_exit:
533 kfree(ndev);
8ebafde0 534 return NULL;
6a2968aa
IE		 535}
536EXPORT_SYMBOL(nci_allocate_device);
537
538/**
539 * nci_free_device - deallocate nci device
540 *
541 * @ndev: The nci device to deallocate
542 */
543void nci_free_device(struct nci_dev *ndev)
544{
545 nfc_dbg("entry");
546
547 nfc_free_device(ndev->nfc_dev);
548 kfree(ndev);
549}
550EXPORT_SYMBOL(nci_free_device);
551
552/**
553 * nci_register_device - register a nci device in the nfc subsystem
554 *
555 * @dev: The nci device to register
556 */
557int nci_register_device(struct nci_dev *ndev)
558{
559 int rc;
560 struct device *dev = &ndev->nfc_dev->dev;
561 char name[32];
562
563 nfc_dbg("entry");
564
565 rc = nfc_register_device(ndev->nfc_dev);
566 if (rc)
567 goto exit;
568
569 ndev->flags = 0;
570
571 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
572 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
573 ndev->cmd_wq = create_singlethread_workqueue(name);
574 if (!ndev->cmd_wq) {
575 rc = -ENOMEM;
576 goto unreg_exit;
577 }
578
579 INIT_WORK(&ndev->rx_work, nci_rx_work);
580 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
581 ndev->rx_wq = create_singlethread_workqueue(name);
582 if (!ndev->rx_wq) {
583 rc = -ENOMEM;
584 goto destroy_cmd_wq_exit;
585 }
586
587 INIT_WORK(&ndev->tx_work, nci_tx_work);
588 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
589 ndev->tx_wq = create_singlethread_workqueue(name);
590 if (!ndev->tx_wq) {
591 rc = -ENOMEM;
592 goto destroy_rx_wq_exit;
593 }
594
595 skb_queue_head_init(&ndev->cmd_q);
596 skb_queue_head_init(&ndev->rx_q);
597 skb_queue_head_init(&ndev->tx_q);
598
599 setup_timer(&ndev->cmd_timer, nci_cmd_timer,
600 (unsigned long) ndev);
601
602 mutex_init(&ndev->req_lock);
603
604 goto exit;
605
606destroy_rx_wq_exit:
607 destroy_workqueue(ndev->rx_wq);
608
609destroy_cmd_wq_exit:
610 destroy_workqueue(ndev->cmd_wq);
611
612unreg_exit:
613 nfc_unregister_device(ndev->nfc_dev);
614
615exit:
616 return rc;
617}
618EXPORT_SYMBOL(nci_register_device);
619
620/**
621 * nci_unregister_device - unregister a nci device in the nfc subsystem
622 *
623 * @dev: The nci device to unregister
624 */
625void nci_unregister_device(struct nci_dev *ndev)
626{
627 nfc_dbg("entry");
628
629 nci_close_device(ndev);
630
631 destroy_workqueue(ndev->cmd_wq);
632 destroy_workqueue(ndev->rx_wq);
633 destroy_workqueue(ndev->tx_wq);
634
635 nfc_unregister_device(ndev->nfc_dev);
636}
637EXPORT_SYMBOL(nci_unregister_device);
638
639/**
640 * nci_recv_frame - receive frame from NCI drivers
641 *
642 * @skb: The sk_buff to receive
643 */
644int nci_recv_frame(struct sk_buff *skb)
645{
646 struct nci_dev *ndev = (struct nci_dev *) skb->dev;
647
648 nfc_dbg("entry, len %d", skb->len);
649
650 if (!ndev || (!test_bit(NCI_UP, &ndev->flags)
651 && !test_bit(NCI_INIT, &ndev->flags))) {
652 kfree_skb(skb);
653 return -ENXIO;
654 }
655
656 /* Queue frame for rx worker thread */
657 skb_queue_tail(&ndev->rx_q, skb);
658 queue_work(ndev->rx_wq, &ndev->rx_work);
659
660 return 0;
661}
662EXPORT_SYMBOL(nci_recv_frame);
663
664static int nci_send_frame(struct sk_buff *skb)
665{
666 struct nci_dev *ndev = (struct nci_dev *) skb->dev;
667
668 nfc_dbg("entry, len %d", skb->len);
669
670 if (!ndev) {
671 kfree_skb(skb);
672 return -ENODEV;
673 }
674
675 /* Get rid of skb owner, prior to sending to the driver. */
676 skb_orphan(skb);
677
678 return ndev->ops->send(skb);
679}
680
681/* Send NCI command */
682int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
683{
684 struct nci_ctrl_hdr *hdr;
685 struct sk_buff *skb;
686
687 nfc_dbg("entry, opcode 0x%x, plen %d", opcode, plen);
688
689 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
690 if (!skb) {
691 nfc_err("no memory for command");
692 return -ENOMEM;
693 }
694
695 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
696 hdr->gid = nci_opcode_gid(opcode);
697 hdr->oid = nci_opcode_oid(opcode);
698 hdr->plen = plen;
699
700 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
701 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
702
703 if (plen)
704 memcpy(skb_put(skb, plen), payload, plen);
705
706 skb->dev = (void *) ndev;
707
708 skb_queue_tail(&ndev->cmd_q, skb);
709 queue_work(ndev->cmd_wq, &ndev->cmd_work);
710
711 return 0;
712}
713
714/* ---- NCI TX Data worker thread ---- */
715
716static void nci_tx_work(struct work_struct *work)
717{
718 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
719 struct sk_buff *skb;
720
721 nfc_dbg("entry, credits_cnt %d", atomic_read(&ndev->credits_cnt));
722
723 /* Send queued tx data */
724 while (atomic_read(&ndev->credits_cnt)) {
725 skb = skb_dequeue(&ndev->tx_q);
726 if (!skb)
727 return;
728
729 atomic_dec(&ndev->credits_cnt);
730
731 nfc_dbg("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d",
732 nci_pbf(skb->data),
733 nci_conn_id(skb->data),
734 nci_plen(skb->data));
735
736 nci_send_frame(skb);
737 }
738}
739
740/* ----- NCI RX worker thread (data & control) ----- */
741
742static void nci_rx_work(struct work_struct *work)
743{
744 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
745 struct sk_buff *skb;
746
747 while ((skb = skb_dequeue(&ndev->rx_q))) {
748 /* Process frame */
749 switch (nci_mt(skb->data)) {
750 case NCI_MT_RSP_PKT:
751 nci_rsp_packet(ndev, skb);
752 break;
753
754 case NCI_MT_NTF_PKT:
755 nci_ntf_packet(ndev, skb);
756 break;
757
758 case NCI_MT_DATA_PKT:
759 nci_rx_data_packet(ndev, skb);
760 break;
761
762 default:
763 nfc_err("unknown MT 0x%x", nci_mt(skb->data));
764 kfree_skb(skb);
765 break;
766 }
767 }
768}
769
770/* ----- NCI TX CMD worker thread ----- */
771
772static void nci_cmd_work(struct work_struct *work)
773{
774 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
775 struct sk_buff *skb;
776
777 nfc_dbg("entry, cmd_cnt %d", atomic_read(&ndev->cmd_cnt));
778
779 /* Send queued command */
780 if (atomic_read(&ndev->cmd_cnt)) {
781 skb = skb_dequeue(&ndev->cmd_q);
782 if (!skb)
783 return;
784
785 atomic_dec(&ndev->cmd_cnt);
786
787 nfc_dbg("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d",
788 nci_pbf(skb->data),
789 nci_opcode_gid(nci_opcode(skb->data)),
790 nci_opcode_oid(nci_opcode(skb->data)),
791 nci_plen(skb->data));
792
793 nci_send_frame(skb);
794
795 mod_timer(&ndev->cmd_timer,
796 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
797 }
798}
Linux 6.x block layer and io_uring tree(s)