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