projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
[deliverable/linux.git] / net / nfc / hci / core.c
1 /*
2 * Copyright (C) 2012 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20 #define pr_fmt(fmt) "hci: %s: " fmt, __func__
21
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/nfc.h>
26
27 #include <net/nfc/nfc.h>
28 #include <net/nfc/hci.h>
29
30 #include "hci.h"
31
32 /* Largest headroom needed for outgoing HCI commands */
33 #define HCI_CMDS_HEADROOM 1
34
35 static void nfc_hci_msg_tx_work(struct work_struct *work)
36 {
37 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
38 msg_tx_work);
39 struct hci_msg *msg;
40 struct sk_buff *skb;
41 int r = 0;
42
43 mutex_lock(&hdev->msg_tx_mutex);
44
45 if (hdev->cmd_pending_msg) {
46 if (timer_pending(&hdev->cmd_timer) == 0) {
47 if (hdev->cmd_pending_msg->cb)
48 hdev->cmd_pending_msg->cb(hdev,
49 NFC_HCI_ANY_E_TIMEOUT,
50 NULL,
51 hdev->
52 cmd_pending_msg->
53 cb_context);
54 kfree(hdev->cmd_pending_msg);
55 hdev->cmd_pending_msg = NULL;
56 } else
57 goto exit;
58 }
59
60 next_msg:
61 if (list_empty(&hdev->msg_tx_queue))
62 goto exit;
63
64 msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
65 list_del(&msg->msg_l);
66
67 pr_debug("msg_tx_queue has a cmd to send\n");
68 while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
69 r = hdev->ops->xmit(hdev, skb);
70 if (r < 0) {
71 kfree_skb(skb);
72 skb_queue_purge(&msg->msg_frags);
73 if (msg->cb)
74 msg->cb(hdev, NFC_HCI_ANY_E_NOK, NULL,
75 msg->cb_context);
76 kfree(msg);
77 break;
78 }
79 }
80
81 if (r)
82 goto next_msg;
83
84 if (msg->wait_response == false) {
85 kfree(msg);
86 goto next_msg;
87 }
88
89 hdev->cmd_pending_msg = msg;
90 mod_timer(&hdev->cmd_timer, jiffies +
91 msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
92
93 exit:
94 mutex_unlock(&hdev->msg_tx_mutex);
95 }
96
97 static void nfc_hci_msg_rx_work(struct work_struct *work)
98 {
99 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
100 msg_rx_work);
101 struct sk_buff *skb;
102 struct hcp_message *message;
103 u8 pipe;
104 u8 type;
105 u8 instruction;
106
107 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
108 pipe = skb->data[0];
109 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
110 message = (struct hcp_message *)skb->data;
111 type = HCP_MSG_GET_TYPE(message->header);
112 instruction = HCP_MSG_GET_CMD(message->header);
113 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
114
115 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
116 }
117 }
118
119 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
120 struct sk_buff *skb)
121 {
122 mutex_lock(&hdev->msg_tx_mutex);
123
124 if (hdev->cmd_pending_msg == NULL) {
125 kfree_skb(skb);
126 goto exit;
127 }
128
129 del_timer_sync(&hdev->cmd_timer);
130
131 if (hdev->cmd_pending_msg->cb)
132 hdev->cmd_pending_msg->cb(hdev, result, skb,
133 hdev->cmd_pending_msg->cb_context);
134 else
135 kfree_skb(skb);
136
137 kfree(hdev->cmd_pending_msg);
138 hdev->cmd_pending_msg = NULL;
139
140 queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
141
142 exit:
143 mutex_unlock(&hdev->msg_tx_mutex);
144 }
145
146 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
147 struct sk_buff *skb)
148 {
149 kfree_skb(skb);
150 }
151
152 static u32 nfc_hci_sak_to_protocol(u8 sak)
153 {
154 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
155 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
156 return NFC_PROTO_MIFARE_MASK;
157 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
158 return NFC_PROTO_ISO14443_MASK;
159 case NFC_HCI_TYPE_A_SEL_PROT_DEP:
160 return NFC_PROTO_NFC_DEP_MASK;
161 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
162 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
163 default:
164 return 0xffffffff;
165 }
166 }
167
168 static int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
169 {
170 struct nfc_target *targets;
171 struct sk_buff *atqa_skb = NULL;
172 struct sk_buff *sak_skb = NULL;
173 int r;
174
175 pr_debug("from gate %d\n", gate);
176
177 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
178 if (targets == NULL)
179 return -ENOMEM;
180
181 switch (gate) {
182 case NFC_HCI_RF_READER_A_GATE:
183 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
184 NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
185 if (r < 0)
186 goto exit;
187
188 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
189 NFC_HCI_RF_READER_A_SAK, &sak_skb);
190 if (r < 0)
191 goto exit;
192
193 if (atqa_skb->len != 2 || sak_skb->len != 1) {
194 r = -EPROTO;
195 goto exit;
196 }
197
198 targets->supported_protocols =
199 nfc_hci_sak_to_protocol(sak_skb->data[0]);
200 if (targets->supported_protocols == 0xffffffff) {
201 r = -EPROTO;
202 goto exit;
203 }
204
205 targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
206 targets->sel_res = sak_skb->data[0];
207
208 if (hdev->ops->complete_target_discovered) {
209 r = hdev->ops->complete_target_discovered(hdev, gate,
210 targets);
211 if (r < 0)
212 goto exit;
213 }
214 break;
215 case NFC_HCI_RF_READER_B_GATE:
216 targets->supported_protocols = NFC_PROTO_ISO14443_MASK;
217 break;
218 default:
219 if (hdev->ops->target_from_gate)
220 r = hdev->ops->target_from_gate(hdev, gate, targets);
221 else
222 r = -EPROTO;
223 if (r < 0)
224 goto exit;
225
226 if (hdev->ops->complete_target_discovered) {
227 r = hdev->ops->complete_target_discovered(hdev, gate,
228 targets);
229 if (r < 0)
230 goto exit;
231 }
232 break;
233 }
234
235 targets->hci_reader_gate = gate;
236
237 r = nfc_targets_found(hdev->ndev, targets, 1);
238
239 exit:
240 kfree(targets);
241 kfree_skb(atqa_skb);
242 kfree_skb(sak_skb);
243
244 return r;
245 }
246
247 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
248 struct sk_buff *skb)
249 {
250 int r = 0;
251
252 switch (event) {
253 case NFC_HCI_EVT_TARGET_DISCOVERED:
254 if (skb->len < 1) { /* no status data? */
255 r = -EPROTO;
256 goto exit;
257 }
258
259 if (skb->data[0] == 3) {
260 /* TODO: Multiple targets in field, none activated
261 * poll is supposedly stopped, but there is no
262 * single target to activate, so nothing to report
263 * up.
264 * if we need to restart poll, we must save the
265 * protocols from the initial poll and reuse here.
266 */
267 }
268
269 if (skb->data[0] != 0) {
270 r = -EPROTO;
271 goto exit;
272 }
273
274 r = nfc_hci_target_discovered(hdev,
275 nfc_hci_pipe2gate(hdev, pipe));
276 break;
277 default:
278 /* TODO: Unknown events are hardware specific
279 * pass them to the driver (needs a new hci_ops) */
280 break;
281 }
282
283 exit:
284 kfree_skb(skb);
285
286 if (r) {
287 /* TODO: There was an error dispatching the event,
288 * how to propagate up to nfc core?
289 */
290 }
291 }
292
293 static void nfc_hci_cmd_timeout(unsigned long data)
294 {
295 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
296
297 queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
298 }
299
300 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
301 u8 gates[])
302 {
303 int r;
304 u8 *p = gates;
305 while (gate_count--) {
306 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, *p);
307 if (r < 0)
308 return r;
309 p++;
310 }
311
312 return 0;
313 }
314
315 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
316 {
317 struct sk_buff *skb = NULL;
318 int r;
319 u8 hci_gates[] = { /* NFC_HCI_ADMIN_GATE MUST be first */
320 NFC_HCI_ADMIN_GATE, NFC_HCI_LOOPBACK_GATE,
321 NFC_HCI_ID_MGMT_GATE, NFC_HCI_LINK_MGMT_GATE,
322 NFC_HCI_RF_READER_B_GATE, NFC_HCI_RF_READER_A_GATE
323 };
324
325 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
326 NFC_HCI_ADMIN_GATE);
327 if (r < 0)
328 goto exit;
329
330 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
331 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
332 if (r < 0)
333 goto disconnect_all;
334
335 if (skb->len && skb->len == strlen(hdev->init_data.session_id))
336 if (memcmp(hdev->init_data.session_id, skb->data,
337 skb->len) == 0) {
338 /* TODO ELa: restore gate<->pipe table from
339 * some TBD location.
340 * note: it doesn't seem possible to get the chip
341 * currently open gate/pipe table.
342 * It is only possible to obtain the supported
343 * gate list.
344 */
345
346 /* goto exit
347 * For now, always do a full initialization */
348 }
349
350 r = nfc_hci_disconnect_all_gates(hdev);
351 if (r < 0)
352 goto exit;
353
354 r = hci_dev_connect_gates(hdev, sizeof(hci_gates), hci_gates);
355 if (r < 0)
356 goto disconnect_all;
357
358 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
359 hdev->init_data.gates);
360 if (r < 0)
361 goto disconnect_all;
362
363 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
364 NFC_HCI_ADMIN_SESSION_IDENTITY,
365 hdev->init_data.session_id,
366 strlen(hdev->init_data.session_id));
367 if (r == 0)
368 goto exit;
369
370 disconnect_all:
371 nfc_hci_disconnect_all_gates(hdev);
372
373 exit:
374 if (skb)
375 kfree_skb(skb);
376
377 return r;
378 }
379
380 static int hci_dev_version(struct nfc_hci_dev *hdev)
381 {
382 int r;
383 struct sk_buff *skb;
384
385 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
386 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
387 if (r < 0)
388 return r;
389
390 if (skb->len != 3) {
391 kfree_skb(skb);
392 return -EINVAL;
393 }
394
395 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
396 hdev->sw_patch = skb->data[0] & 0x0f;
397 hdev->sw_flashlib_major = skb->data[1];
398 hdev->sw_flashlib_minor = skb->data[2];
399
400 kfree_skb(skb);
401
402 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
403 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
404 if (r < 0)
405 return r;
406
407 if (skb->len != 3) {
408 kfree_skb(skb);
409 return -EINVAL;
410 }
411
412 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
413 hdev->hw_version = skb->data[0] & 0x1f;
414 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
415 hdev->hw_software = skb->data[1] & 0x3f;
416 hdev->hw_bsid = skb->data[2];
417
418 kfree_skb(skb);
419
420 pr_info("SOFTWARE INFO:\n");
421 pr_info("RomLib : %d\n", hdev->sw_romlib);
422 pr_info("Patch : %d\n", hdev->sw_patch);
423 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
424 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
425 pr_info("HARDWARE INFO:\n");
426 pr_info("Derivative : %d\n", hdev->hw_derivative);
427 pr_info("HW Version : %d\n", hdev->hw_version);
428 pr_info("#MPW : %d\n", hdev->hw_mpw);
429 pr_info("Software : %d\n", hdev->hw_software);
430 pr_info("BSID Version : %d\n", hdev->hw_bsid);
431
432 return 0;
433 }
434
435 static int hci_dev_up(struct nfc_dev *nfc_dev)
436 {
437 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
438 int r = 0;
439
440 if (hdev->ops->open) {
441 r = hdev->ops->open(hdev);
442 if (r < 0)
443 return r;
444 }
445
446 r = hci_dev_session_init(hdev);
447 if (r < 0)
448 goto exit;
449
450 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
451 NFC_HCI_EVT_END_OPERATION, NULL, 0);
452 if (r < 0)
453 goto exit;
454
455 if (hdev->ops->hci_ready) {
456 r = hdev->ops->hci_ready(hdev);
457 if (r < 0)
458 goto exit;
459 }
460
461 r = hci_dev_version(hdev);
462 if (r < 0)
463 goto exit;
464
465 exit:
466 if (r < 0)
467 if (hdev->ops->close)
468 hdev->ops->close(hdev);
469 return r;
470 }
471
472 static int hci_dev_down(struct nfc_dev *nfc_dev)
473 {
474 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
475
476 if (hdev->ops->close)
477 hdev->ops->close(hdev);
478
479 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
480
481 return 0;
482 }
483
484 static int hci_start_poll(struct nfc_dev *nfc_dev, u32 protocols)
485 {
486 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
487
488 if (hdev->ops->start_poll)
489 return hdev->ops->start_poll(hdev, protocols);
490 else
491 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
492 NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
493 }
494
495 static void hci_stop_poll(struct nfc_dev *nfc_dev)
496 {
497 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
498
499 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
500 NFC_HCI_EVT_END_OPERATION, NULL, 0);
501 }
502
503 static int hci_activate_target(struct nfc_dev *nfc_dev,
504 struct nfc_target *target, u32 protocol)
505 {
506 return 0;
507 }
508
509 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
510 struct nfc_target *target)
511 {
512 }
513
514 static int hci_data_exchange(struct nfc_dev *nfc_dev, struct nfc_target *target,
515 struct sk_buff *skb, data_exchange_cb_t cb,
516 void *cb_context)
517 {
518 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
519 int r;
520 struct sk_buff *res_skb = NULL;
521
522 pr_debug("target_idx=%d\n", target->idx);
523
524 switch (target->hci_reader_gate) {
525 case NFC_HCI_RF_READER_A_GATE:
526 case NFC_HCI_RF_READER_B_GATE:
527 if (hdev->ops->data_exchange) {
528 r = hdev->ops->data_exchange(hdev, target, skb,
529 &res_skb);
530 if (r <= 0) /* handled */
531 break;
532 }
533
534 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
535 r = nfc_hci_send_cmd(hdev, target->hci_reader_gate,
536 NFC_HCI_WR_XCHG_DATA,
537 skb->data, skb->len, &res_skb);
538 /*
539 * TODO: Check RF Error indicator to make sure data is valid.
540 * It seems that HCI cmd can complete without error, but data
541 * can be invalid if an RF error occured? Ignore for now.
542 */
543 if (r == 0)
544 skb_trim(res_skb, res_skb->len - 1); /* RF Err ind */
545 break;
546 default:
547 if (hdev->ops->data_exchange) {
548 r = hdev->ops->data_exchange(hdev, target, skb,
549 &res_skb);
550 if (r == 1)
551 r = -ENOTSUPP;
552 }
553 else
554 r = -ENOTSUPP;
555 }
556
557 kfree_skb(skb);
558
559 cb(cb_context, res_skb, r);
560
561 return 0;
562 }
563
564 static int hci_check_presence(struct nfc_dev *nfc_dev,
565 struct nfc_target *target)
566 {
567 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
568
569 if (hdev->ops->check_presence)
570 return hdev->ops->check_presence(hdev, target);
571
572 return 0;
573 }
574
575 static struct nfc_ops hci_nfc_ops = {
576 .dev_up = hci_dev_up,
577 .dev_down = hci_dev_down,
578 .start_poll = hci_start_poll,
579 .stop_poll = hci_stop_poll,
580 .activate_target = hci_activate_target,
581 .deactivate_target = hci_deactivate_target,
582 .data_exchange = hci_data_exchange,
583 .check_presence = hci_check_presence,
584 };
585
586 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
587 struct nfc_hci_init_data *init_data,
588 u32 protocols,
589 int tx_headroom,
590 int tx_tailroom,
591 int max_link_payload)
592 {
593 struct nfc_hci_dev *hdev;
594
595 if (ops->xmit == NULL)
596 return NULL;
597
598 if (protocols == 0)
599 return NULL;
600
601 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
602 if (hdev == NULL)
603 return NULL;
604
605 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
606 tx_headroom + HCI_CMDS_HEADROOM,
607 tx_tailroom);
608 if (!hdev->ndev) {
609 kfree(hdev);
610 return NULL;
611 }
612
613 hdev->ops = ops;
614 hdev->max_data_link_payload = max_link_payload;
615 hdev->init_data = *init_data;
616
617 nfc_set_drvdata(hdev->ndev, hdev);
618
619 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
620
621 return hdev;
622 }
623 EXPORT_SYMBOL(nfc_hci_allocate_device);
624
625 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
626 {
627 nfc_free_device(hdev->ndev);
628 kfree(hdev);
629 }
630 EXPORT_SYMBOL(nfc_hci_free_device);
631
632 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
633 {
634 struct device *dev = &hdev->ndev->dev;
635 const char *devname = dev_name(dev);
636 char name[32];
637 int r = 0;
638
639 mutex_init(&hdev->msg_tx_mutex);
640
641 INIT_LIST_HEAD(&hdev->msg_tx_queue);
642
643 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
644 snprintf(name, sizeof(name), "%s_hci_msg_tx_wq", devname);
645 hdev->msg_tx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
646 WQ_MEM_RECLAIM, 1);
647 if (hdev->msg_tx_wq == NULL) {
648 r = -ENOMEM;
649 goto exit;
650 }
651
652 init_timer(&hdev->cmd_timer);
653 hdev->cmd_timer.data = (unsigned long)hdev;
654 hdev->cmd_timer.function = nfc_hci_cmd_timeout;
655
656 skb_queue_head_init(&hdev->rx_hcp_frags);
657
658 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
659 snprintf(name, sizeof(name), "%s_hci_msg_rx_wq", devname);
660 hdev->msg_rx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
661 WQ_MEM_RECLAIM, 1);
662 if (hdev->msg_rx_wq == NULL) {
663 r = -ENOMEM;
664 goto exit;
665 }
666
667 skb_queue_head_init(&hdev->msg_rx_queue);
668
669 r = nfc_register_device(hdev->ndev);
670
671 exit:
672 if (r < 0) {
673 if (hdev->msg_tx_wq)
674 destroy_workqueue(hdev->msg_tx_wq);
675 if (hdev->msg_rx_wq)
676 destroy_workqueue(hdev->msg_rx_wq);
677 }
678
679 return r;
680 }
681 EXPORT_SYMBOL(nfc_hci_register_device);
682
683 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
684 {
685 struct hci_msg *msg;
686
687 skb_queue_purge(&hdev->rx_hcp_frags);
688 skb_queue_purge(&hdev->msg_rx_queue);
689
690 while ((msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg,
691 msg_l)) != NULL) {
692 list_del(&msg->msg_l);
693 skb_queue_purge(&msg->msg_frags);
694 kfree(msg);
695 }
696
697 del_timer_sync(&hdev->cmd_timer);
698
699 nfc_unregister_device(hdev->ndev);
700
701 destroy_workqueue(hdev->msg_tx_wq);
702
703 destroy_workqueue(hdev->msg_rx_wq);
704 }
705 EXPORT_SYMBOL(nfc_hci_unregister_device);
706
707 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
708 {
709 hdev->clientdata = clientdata;
710 }
711 EXPORT_SYMBOL(nfc_hci_set_clientdata);
712
713 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
714 {
715 return hdev->clientdata;
716 }
717 EXPORT_SYMBOL(nfc_hci_get_clientdata);
718
719 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
720 {
721 struct hcp_packet *packet;
722 u8 type;
723 u8 instruction;
724 struct sk_buff *hcp_skb;
725 u8 pipe;
726 struct sk_buff *frag_skb;
727 int msg_len;
728
729 if (skb == NULL) {
730 /* TODO ELa: lower layer had permanent failure, need to
731 * propagate that up
732 */
733
734 skb_queue_purge(&hdev->rx_hcp_frags);
735
736 return;
737 }
738
739 packet = (struct hcp_packet *)skb->data;
740 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
741 skb_queue_tail(&hdev->rx_hcp_frags, skb);
742 return;
743 }
744
745 /* it's the last fragment. Does it need re-aggregation? */
746 if (skb_queue_len(&hdev->rx_hcp_frags)) {
747 pipe = packet->header & NFC_HCI_FRAGMENT;
748 skb_queue_tail(&hdev->rx_hcp_frags, skb);
749
750 msg_len = 0;
751 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
752 msg_len += (frag_skb->len -
753 NFC_HCI_HCP_PACKET_HEADER_LEN);
754 }
755
756 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
757 msg_len, GFP_KERNEL);
758 if (hcp_skb == NULL) {
759 /* TODO ELa: cannot deliver HCP message. How to
760 * propagate error up?
761 */
762 }
763
764 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
765
766 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
767 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
768 memcpy(skb_put(hcp_skb, msg_len),
769 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
770 msg_len);
771 }
772
773 skb_queue_purge(&hdev->rx_hcp_frags);
774 } else {
775 packet->header &= NFC_HCI_FRAGMENT;
776 hcp_skb = skb;
777 }
778
779 /* if this is a response, dispatch immediately to
780 * unblock waiting cmd context. Otherwise, enqueue to dispatch
781 * in separate context where handler can also execute command.
782 */
783 packet = (struct hcp_packet *)hcp_skb->data;
784 type = HCP_MSG_GET_TYPE(packet->message.header);
785 if (type == NFC_HCI_HCP_RESPONSE) {
786 pipe = packet->header;
787 instruction = HCP_MSG_GET_CMD(packet->message.header);
788 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
789 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
790 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
791 } else {
792 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
793 queue_work(hdev->msg_rx_wq, &hdev->msg_rx_work);
794 }
795 }
796 EXPORT_SYMBOL(nfc_hci_recv_frame);
797
798 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
This page took 0.04682 seconds and 6 git commands to generate.