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NFC: Remove repeated code for NULL check
[deliverable/linux.git] / net / nfc / hci / core.c
CommitLineData
8b8d2e08
EL		 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
6c1c5b9e
EL		 35static int nfc_hci_result_to_errno(u8 result)
36{
37 switch (result) {
38 case NFC_HCI_ANY_OK:
39 return 0;
40 case NFC_HCI_ANY_E_TIMEOUT:
41 return -ETIME;
42 default:
43 return -1;
44 }
45}
46
8b8d2e08
EL		 47static void nfc_hci_msg_tx_work(struct work_struct *work)
48{
49 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
50 msg_tx_work);
51 struct hci_msg *msg;
52 struct sk_buff *skb;
53 int r = 0;
54
55 mutex_lock(&hdev->msg_tx_mutex);
56
57 if (hdev->cmd_pending_msg) {
58 if (timer_pending(&hdev->cmd_timer) == 0) {
59 if (hdev->cmd_pending_msg->cb)
60 hdev->cmd_pending_msg->cb(hdev,
6c1c5b9e 61 -ETIME,
8b8d2e08
EL		 62 NULL,
63 hdev->
64 cmd_pending_msg->
65 cb_context);
66 kfree(hdev->cmd_pending_msg);
67 hdev->cmd_pending_msg = NULL;
68 } else
69 goto exit;
70 }
71
72next_msg:
73 if (list_empty(&hdev->msg_tx_queue))
74 goto exit;
75
76 msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
77 list_del(&msg->msg_l);
78
79 pr_debug("msg_tx_queue has a cmd to send\n");
80 while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
81 r = hdev->ops->xmit(hdev, skb);
82 if (r < 0) {
83 kfree_skb(skb);
84 skb_queue_purge(&msg->msg_frags);
85 if (msg->cb)
6c1c5b9e 86 msg->cb(hdev, r, NULL, msg->cb_context);
8b8d2e08
EL		 87 kfree(msg);
88 break;
89 }
90 }
91
92 if (r)
93 goto next_msg;
94
95 if (msg->wait_response == false) {
96 kfree(msg);
97 goto next_msg;
98 }
99
100 hdev->cmd_pending_msg = msg;
101 mod_timer(&hdev->cmd_timer, jiffies +
102 msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
103
104exit:
105 mutex_unlock(&hdev->msg_tx_mutex);
106}
107
108static void nfc_hci_msg_rx_work(struct work_struct *work)
109{
110 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
111 msg_rx_work);
112 struct sk_buff *skb;
113 struct hcp_message *message;
114 u8 pipe;
115 u8 type;
116 u8 instruction;
117
118 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
119 pipe = skb->data[0];
120 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
121 message = (struct hcp_message *)skb->data;
122 type = HCP_MSG_GET_TYPE(message->header);
123 instruction = HCP_MSG_GET_CMD(message->header);
124 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
125
126 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
127 }
128}
129
ccca0d6e
EL		 130static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
131 struct sk_buff *skb)
8b8d2e08 132{
8b8d2e08
EL		 133 del_timer_sync(&hdev->cmd_timer);
134
135 if (hdev->cmd_pending_msg->cb)
ccca0d6e 136 hdev->cmd_pending_msg->cb(hdev, err, skb,
8b8d2e08
EL		 137 hdev->cmd_pending_msg->cb_context);
138 else
139 kfree_skb(skb);
140
141 kfree(hdev->cmd_pending_msg);
142 hdev->cmd_pending_msg = NULL;
143
144 queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
ccca0d6e
EL		 145}
146
147void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
148 struct sk_buff *skb)
149{
150 mutex_lock(&hdev->msg_tx_mutex);
151
152 if (hdev->cmd_pending_msg == NULL) {
153 kfree_skb(skb);
154 goto exit;
155 }
156
157 __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
8b8d2e08
EL		 158
159exit:
160 mutex_unlock(&hdev->msg_tx_mutex);
161}
162
163void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
164 struct sk_buff *skb)
165{
166 kfree_skb(skb);
167}
168
169static u32 nfc_hci_sak_to_protocol(u8 sak)
170{
171 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
172 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
173 return NFC_PROTO_MIFARE_MASK;
174 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
175 return NFC_PROTO_ISO14443_MASK;
176 case NFC_HCI_TYPE_A_SEL_PROT_DEP:
177 return NFC_PROTO_NFC_DEP_MASK;
178 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
179 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
180 default:
181 return 0xffffffff;
182 }
183}
184
185static int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
186{
187 struct nfc_target *targets;
188 struct sk_buff *atqa_skb = NULL;
189 struct sk_buff *sak_skb = NULL;
81b30395 190 struct sk_buff *uid_skb = NULL;
8b8d2e08
EL		 191 int r;
192
193 pr_debug("from gate %d\n", gate);
194
195 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
196 if (targets == NULL)
197 return -ENOMEM;
198
199 switch (gate) {
200 case NFC_HCI_RF_READER_A_GATE:
201 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
202 NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
203 if (r < 0)
204 goto exit;
205
206 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
207 NFC_HCI_RF_READER_A_SAK, &sak_skb);
208 if (r < 0)
209 goto exit;
210
211 if (atqa_skb->len != 2 || sak_skb->len != 1) {
212 r = -EPROTO;
213 goto exit;
214 }
215
216 targets->supported_protocols =
217 nfc_hci_sak_to_protocol(sak_skb->data[0]);
218 if (targets->supported_protocols == 0xffffffff) {
219 r = -EPROTO;
220 goto exit;
221 }
222
223 targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
224 targets->sel_res = sak_skb->data[0];
225
81b30395
EL		 226 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
227 NFC_HCI_RF_READER_A_UID, &uid_skb);
228 if (r < 0)
229 goto exit;
230
231 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
232 r = -EPROTO;
233 goto exit;
234 }
235
236 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
237 targets->nfcid1_len = uid_skb->len;
238
8b8d2e08
EL		 239 if (hdev->ops->complete_target_discovered) {
240 r = hdev->ops->complete_target_discovered(hdev, gate,
241 targets);
242 if (r < 0)
243 goto exit;
244 }
245 break;
246 case NFC_HCI_RF_READER_B_GATE:
01d719a2 247 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
8b8d2e08
EL		 248 break;
249 default:
250 if (hdev->ops->target_from_gate)
251 r = hdev->ops->target_from_gate(hdev, gate, targets);
252 else
253 r = -EPROTO;
254 if (r < 0)
255 goto exit;
256
257 if (hdev->ops->complete_target_discovered) {
258 r = hdev->ops->complete_target_discovered(hdev, gate,
259 targets);
260 if (r < 0)
261 goto exit;
262 }
263 break;
264 }
265
266 targets->hci_reader_gate = gate;
267
268 r = nfc_targets_found(hdev->ndev, targets, 1);
8b8d2e08
EL		 269
270exit:
271 kfree(targets);
272 kfree_skb(atqa_skb);
273 kfree_skb(sak_skb);
81b30395 274 kfree_skb(uid_skb);
8b8d2e08
EL		 275
276 return r;
277}
278
279void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
280 struct sk_buff *skb)
281{
282 int r = 0;
283
284 switch (event) {
285 case NFC_HCI_EVT_TARGET_DISCOVERED:
8b8d2e08
EL		 286 if (skb->len < 1) { /* no status data? */
287 r = -EPROTO;
288 goto exit;
289 }
290
291 if (skb->data[0] == 3) {
292 /* TODO: Multiple targets in field, none activated
293 * poll is supposedly stopped, but there is no
294 * single target to activate, so nothing to report
295 * up.
296 * if we need to restart poll, we must save the
297 * protocols from the initial poll and reuse here.
298 */
299 }
300
301 if (skb->data[0] != 0) {
302 r = -EPROTO;
303 goto exit;
304 }
305
306 r = nfc_hci_target_discovered(hdev,
307 nfc_hci_pipe2gate(hdev, pipe));
308 break;
309 default:
310 /* TODO: Unknown events are hardware specific
311 * pass them to the driver (needs a new hci_ops) */
312 break;
313 }
314
315exit:
316 kfree_skb(skb);
317
318 if (r) {
319 /* TODO: There was an error dispatching the event,
320 * how to propagate up to nfc core?
321 */
322 }
323}
324
325static void nfc_hci_cmd_timeout(unsigned long data)
326{
327 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
328
329 queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
330}
331
332static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
a10d595b 333 struct nfc_hci_gate *gates)
8b8d2e08
EL		 334{
335 int r;
8b8d2e08 336 while (gate_count--) {
a10d595b
EL		 337 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
338 gates->gate, gates->pipe);
8b8d2e08
EL		 339 if (r < 0)
340 return r;
a10d595b 341 gates++;
8b8d2e08
EL		 342 }
343
344 return 0;
345}
346
347static int hci_dev_session_init(struct nfc_hci_dev *hdev)
348{
349 struct sk_buff *skb = NULL;
350 int r;
a10d595b
EL		 351
352 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
353 return -EPROTO;
8b8d2e08
EL		 354
355 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
a10d595b
EL		 356 hdev->init_data.gates[0].gate,
357 hdev->init_data.gates[0].pipe);
8b8d2e08
EL		 358 if (r < 0)
359 goto exit;
360
361 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
362 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
363 if (r < 0)
364 goto disconnect_all;
365
366 if (skb->len && skb->len == strlen(hdev->init_data.session_id))
367 if (memcmp(hdev->init_data.session_id, skb->data,
368 skb->len) == 0) {
369 /* TODO ELa: restore gate<->pipe table from
370 * some TBD location.
371 * note: it doesn't seem possible to get the chip
372 * currently open gate/pipe table.
373 * It is only possible to obtain the supported
374 * gate list.
375 */
376
377 /* goto exit
378 * For now, always do a full initialization */
379 }
380
381 r = nfc_hci_disconnect_all_gates(hdev);
382 if (r < 0)
383 goto exit;
384
8b8d2e08
EL		 385 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
386 hdev->init_data.gates);
387 if (r < 0)
388 goto disconnect_all;
389
390 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
391 NFC_HCI_ADMIN_SESSION_IDENTITY,
392 hdev->init_data.session_id,
393 strlen(hdev->init_data.session_id));
394 if (r == 0)
395 goto exit;
396
397disconnect_all:
398 nfc_hci_disconnect_all_gates(hdev);
399
400exit:
401 if (skb)
402 kfree_skb(skb);
403
404 return r;
405}
406
407static int hci_dev_version(struct nfc_hci_dev *hdev)
408{
409 int r;
410 struct sk_buff *skb;
411
412 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
413 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
414 if (r < 0)
415 return r;
416
417 if (skb->len != 3) {
418 kfree_skb(skb);
419 return -EINVAL;
420 }
421
422 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
423 hdev->sw_patch = skb->data[0] & 0x0f;
424 hdev->sw_flashlib_major = skb->data[1];
425 hdev->sw_flashlib_minor = skb->data[2];
426
427 kfree_skb(skb);
428
429 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
430 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
431 if (r < 0)
432 return r;
433
434 if (skb->len != 3) {
435 kfree_skb(skb);
436 return -EINVAL;
437 }
438
439 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
440 hdev->hw_version = skb->data[0] & 0x1f;
441 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
442 hdev->hw_software = skb->data[1] & 0x3f;
443 hdev->hw_bsid = skb->data[2];
444
445 kfree_skb(skb);
446
447 pr_info("SOFTWARE INFO:\n");
448 pr_info("RomLib : %d\n", hdev->sw_romlib);
449 pr_info("Patch : %d\n", hdev->sw_patch);
450 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
451 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
452 pr_info("HARDWARE INFO:\n");
453 pr_info("Derivative : %d\n", hdev->hw_derivative);
454 pr_info("HW Version : %d\n", hdev->hw_version);
455 pr_info("#MPW : %d\n", hdev->hw_mpw);
456 pr_info("Software : %d\n", hdev->hw_software);
457 pr_info("BSID Version : %d\n", hdev->hw_bsid);
458
459 return 0;
460}
461
462static int hci_dev_up(struct nfc_dev *nfc_dev)
463{
464 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
465 int r = 0;
466
467 if (hdev->ops->open) {
468 r = hdev->ops->open(hdev);
469 if (r < 0)
470 return r;
471 }
472
473 r = hci_dev_session_init(hdev);
474 if (r < 0)
475 goto exit;
476
477 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
478 NFC_HCI_EVT_END_OPERATION, NULL, 0);
479 if (r < 0)
480 goto exit;
481
482 if (hdev->ops->hci_ready) {
483 r = hdev->ops->hci_ready(hdev);
484 if (r < 0)
485 goto exit;
486 }
487
488 r = hci_dev_version(hdev);
489 if (r < 0)
490 goto exit;
491
492exit:
493 if (r < 0)
494 if (hdev->ops->close)
495 hdev->ops->close(hdev);
496 return r;
497}
498
499static int hci_dev_down(struct nfc_dev *nfc_dev)
500{
501 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
502
503 if (hdev->ops->close)
504 hdev->ops->close(hdev);
505
506 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
507
508 return 0;
509}
510
fe7c5800
SO		 511static int hci_start_poll(struct nfc_dev *nfc_dev,
512 u32 im_protocols, u32 tm_protocols)
8b8d2e08
EL		 513{
514 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
8b8d2e08
EL		 515
516 if (hdev->ops->start_poll)
fe7c5800 517 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
8b8d2e08 518 else
03bed29e 519 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
8b8d2e08 520 NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
8b8d2e08
EL		 521}
522
523static void hci_stop_poll(struct nfc_dev *nfc_dev)
524{
525 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
526
03bed29e
EL		 527 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
528 NFC_HCI_EVT_END_OPERATION, NULL, 0);
8b8d2e08
EL		 529}
530
90099433
EL		 531static int hci_activate_target(struct nfc_dev *nfc_dev,
532 struct nfc_target *target, u32 protocol)
8b8d2e08 533{
8b8d2e08
EL		 534 return 0;
535}
536
90099433
EL		 537static void hci_deactivate_target(struct nfc_dev *nfc_dev,
538 struct nfc_target *target)
8b8d2e08
EL		 539{
540}
541
be9ae4ce
SO		 542static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
543 struct sk_buff *skb, data_exchange_cb_t cb,
544 void *cb_context)
8b8d2e08
EL		 545{
546 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
547 int r;
8b8d2e08
EL		 548 struct sk_buff *res_skb = NULL;
549
90099433 550 pr_debug("target_idx=%d\n", target->idx);
8b8d2e08
EL		 551
552 switch (target->hci_reader_gate) {
553 case NFC_HCI_RF_READER_A_GATE:
554 case NFC_HCI_RF_READER_B_GATE:
555 if (hdev->ops->data_exchange) {
556 r = hdev->ops->data_exchange(hdev, target, skb,
557 &res_skb);
558 if (r <= 0) /* handled */
559 break;
560 }
561
562 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
563 r = nfc_hci_send_cmd(hdev, target->hci_reader_gate,
564 NFC_HCI_WR_XCHG_DATA,
565 skb->data, skb->len, &res_skb);
566 /*
567 * TODO: Check RF Error indicator to make sure data is valid.
568 * It seems that HCI cmd can complete without error, but data
569 * can be invalid if an RF error occured? Ignore for now.
570 */
571 if (r == 0)
572 skb_trim(res_skb, res_skb->len - 1); /* RF Err ind */
573 break;
574 default:
575 if (hdev->ops->data_exchange) {
576 r = hdev->ops->data_exchange(hdev, target, skb,
577 &res_skb);
578 if (r == 1)
579 r = -ENOTSUPP;
580 }
581 else
582 r = -ENOTSUPP;
583 }
584
585 kfree_skb(skb);
586
587 cb(cb_context, res_skb, r);
588
589 return 0;
590}
591
1676f751
EL		 592static int hci_check_presence(struct nfc_dev *nfc_dev,
593 struct nfc_target *target)
594{
595 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
596
597 if (hdev->ops->check_presence)
598 return hdev->ops->check_presence(hdev, target);
599
600 return 0;
601}
602
bd007bea 603static struct nfc_ops hci_nfc_ops = {
8b8d2e08
EL		 604 .dev_up = hci_dev_up,
605 .dev_down = hci_dev_down,
606 .start_poll = hci_start_poll,
607 .stop_poll = hci_stop_poll,
608 .activate_target = hci_activate_target,
609 .deactivate_target = hci_deactivate_target,
be9ae4ce 610 .im_transceive = hci_transceive,
1676f751 611 .check_presence = hci_check_presence,
8b8d2e08
EL		 612};
613
614struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
615 struct nfc_hci_init_data *init_data,
616 u32 protocols,
617 int tx_headroom,
618 int tx_tailroom,
619 int max_link_payload)
620{
621 struct nfc_hci_dev *hdev;
622
623 if (ops->xmit == NULL)
624 return NULL;
625
626 if (protocols == 0)
627 return NULL;
628
629 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
630 if (hdev == NULL)
631 return NULL;
632
633 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
634 tx_headroom + HCI_CMDS_HEADROOM,
635 tx_tailroom);
636 if (!hdev->ndev) {
637 kfree(hdev);
638 return NULL;
639 }
640
641 hdev->ops = ops;
642 hdev->max_data_link_payload = max_link_payload;
643 hdev->init_data = *init_data;
644
645 nfc_set_drvdata(hdev->ndev, hdev);
646
647 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
648
649 return hdev;
650}
651EXPORT_SYMBOL(nfc_hci_allocate_device);
652
653void nfc_hci_free_device(struct nfc_hci_dev *hdev)
654{
655 nfc_free_device(hdev->ndev);
656 kfree(hdev);
657}
658EXPORT_SYMBOL(nfc_hci_free_device);
659
660int nfc_hci_register_device(struct nfc_hci_dev *hdev)
661{
662 struct device *dev = &hdev->ndev->dev;
663 const char *devname = dev_name(dev);
664 char name[32];
665 int r = 0;
666
667 mutex_init(&hdev->msg_tx_mutex);
668
669 INIT_LIST_HEAD(&hdev->msg_tx_queue);
670
671 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
672 snprintf(name, sizeof(name), "%s_hci_msg_tx_wq", devname);
673 hdev->msg_tx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
674 WQ_MEM_RECLAIM, 1);
675 if (hdev->msg_tx_wq == NULL) {
676 r = -ENOMEM;
677 goto exit;
678 }
679
680 init_timer(&hdev->cmd_timer);
681 hdev->cmd_timer.data = (unsigned long)hdev;
682 hdev->cmd_timer.function = nfc_hci_cmd_timeout;
683
684 skb_queue_head_init(&hdev->rx_hcp_frags);
685
686 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
687 snprintf(name, sizeof(name), "%s_hci_msg_rx_wq", devname);
688 hdev->msg_rx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
689 WQ_MEM_RECLAIM, 1);
690 if (hdev->msg_rx_wq == NULL) {
691 r = -ENOMEM;
692 goto exit;
693 }
694
695 skb_queue_head_init(&hdev->msg_rx_queue);
696
697 r = nfc_register_device(hdev->ndev);
698
699exit:
700 if (r < 0) {
701 if (hdev->msg_tx_wq)
702 destroy_workqueue(hdev->msg_tx_wq);
703 if (hdev->msg_rx_wq)
704 destroy_workqueue(hdev->msg_rx_wq);
705 }
706
707 return r;
708}
709EXPORT_SYMBOL(nfc_hci_register_device);
710
711void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
712{
1913e57c 713 struct hci_msg *msg, *n;
8b8d2e08
EL		 714
715 skb_queue_purge(&hdev->rx_hcp_frags);
716 skb_queue_purge(&hdev->msg_rx_queue);
717
1913e57c 718 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
8b8d2e08
EL		 719 list_del(&msg->msg_l);
720 skb_queue_purge(&msg->msg_frags);
721 kfree(msg);
722 }
723
724 del_timer_sync(&hdev->cmd_timer);
725
726 nfc_unregister_device(hdev->ndev);
727
728 destroy_workqueue(hdev->msg_tx_wq);
729
730 destroy_workqueue(hdev->msg_rx_wq);
731}
732EXPORT_SYMBOL(nfc_hci_unregister_device);
733
734void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
735{
736 hdev->clientdata = clientdata;
737}
738EXPORT_SYMBOL(nfc_hci_set_clientdata);
739
740void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
741{
742 return hdev->clientdata;
743}
744EXPORT_SYMBOL(nfc_hci_get_clientdata);
745
72b06f75 746static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
a9a741a7 747{
a070c859
EL		 748 mutex_lock(&hdev->msg_tx_mutex);
749
750 if (hdev->cmd_pending_msg == NULL) {
751 nfc_driver_failure(hdev->ndev, err);
752 goto exit;
753 }
754
755 __nfc_hci_cmd_completion(hdev, err, NULL);
756
757exit:
758 mutex_unlock(&hdev->msg_tx_mutex);
a9a741a7 759}
72b06f75
EL		 760
761void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
762{
763 nfc_hci_failure(hdev, err);
764}
a9a741a7
EL		 765EXPORT_SYMBOL(nfc_hci_driver_failure);
766
8b8d2e08
EL		 767void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
768{
769 struct hcp_packet *packet;
770 u8 type;
771 u8 instruction;
772 struct sk_buff *hcp_skb;
773 u8 pipe;
774 struct sk_buff *frag_skb;
775 int msg_len;
776
8b8d2e08
EL		 777 packet = (struct hcp_packet *)skb->data;
778 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
779 skb_queue_tail(&hdev->rx_hcp_frags, skb);
780 return;
781 }
782
783 /* it's the last fragment. Does it need re-aggregation? */
784 if (skb_queue_len(&hdev->rx_hcp_frags)) {
785 pipe = packet->header & NFC_HCI_FRAGMENT;
786 skb_queue_tail(&hdev->rx_hcp_frags, skb);
787
788 msg_len = 0;
789 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
790 msg_len += (frag_skb->len -
791 NFC_HCI_HCP_PACKET_HEADER_LEN);
792 }
793
794 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
795 msg_len, GFP_KERNEL);
796 if (hcp_skb == NULL) {
72b06f75
EL		 797 nfc_hci_failure(hdev, -ENOMEM);
798 return;
8b8d2e08
EL		 799 }
800
801 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
802
803 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
804 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
805 memcpy(skb_put(hcp_skb, msg_len),
806 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
807 msg_len);
808 }
809
810 skb_queue_purge(&hdev->rx_hcp_frags);
811 } else {
812 packet->header &= NFC_HCI_FRAGMENT;
813 hcp_skb = skb;
814 }
815
816 /* if this is a response, dispatch immediately to
817 * unblock waiting cmd context. Otherwise, enqueue to dispatch
818 * in separate context where handler can also execute command.
819 */
820 packet = (struct hcp_packet *)hcp_skb->data;
821 type = HCP_MSG_GET_TYPE(packet->message.header);
822 if (type == NFC_HCI_HCP_RESPONSE) {
823 pipe = packet->header;
824 instruction = HCP_MSG_GET_CMD(packet->message.header);
825 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
826 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
827 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
828 } else {
829 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
830 queue_work(hdev->msg_rx_wq, &hdev->msg_rx_work);
831 }
832}
833EXPORT_SYMBOL(nfc_hci_recv_frame);
834
835MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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