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NFC: Handle pn544 continue activation
[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>
67cccfe1 29#include <net/nfc/llc.h>
8b8d2e08
EL		 30
31#include "hci.h"
32
33/* Largest headroom needed for outgoing HCI commands */
34#define HCI_CMDS_HEADROOM 1
35
6c1c5b9e
EL		 36static int nfc_hci_result_to_errno(u8 result)
37{
38 switch (result) {
39 case NFC_HCI_ANY_OK:
40 return 0;
41 case NFC_HCI_ANY_E_TIMEOUT:
42 return -ETIME;
43 default:
44 return -1;
45 }
46}
47
8b8d2e08
EL		 48static void nfc_hci_msg_tx_work(struct work_struct *work)
49{
50 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
51 msg_tx_work);
52 struct hci_msg *msg;
53 struct sk_buff *skb;
54 int r = 0;
55
56 mutex_lock(&hdev->msg_tx_mutex);
57
58 if (hdev->cmd_pending_msg) {
59 if (timer_pending(&hdev->cmd_timer) == 0) {
60 if (hdev->cmd_pending_msg->cb)
b5faa648 61 hdev->cmd_pending_msg->cb(hdev->
8b8d2e08 62 cmd_pending_msg->
b5faa648
EL		 63 cb_context,
64 NULL,
65 -ETIME);
8b8d2e08
EL		 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) {
412fda53 81 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
8b8d2e08
EL		 82 if (r < 0) {
83 kfree_skb(skb);
84 skb_queue_purge(&msg->msg_frags);
85 if (msg->cb)
b5faa648 86 msg->cb(msg->cb_context, NULL, r);
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)
b5faa648
EL		 136 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
137 skb, err);
8b8d2e08
EL		 138 else
139 kfree_skb(skb);
140
141 kfree(hdev->cmd_pending_msg);
142 hdev->cmd_pending_msg = NULL;
143
916082b0 144 schedule_work(&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
f7a5f6c5 185int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
8b8d2e08
EL		 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
928326f2
AW		 266 /* if driver set the new gate, we will skip the old one */
267 if (targets->hci_reader_gate == 0x00)
268 targets->hci_reader_gate = gate;
8b8d2e08
EL		 269
270 r = nfc_targets_found(hdev->ndev, targets, 1);
8b8d2e08
EL		 271
272exit:
273 kfree(targets);
274 kfree_skb(atqa_skb);
275 kfree_skb(sak_skb);
81b30395 276 kfree_skb(uid_skb);
8b8d2e08
EL		 277
278 return r;
279}
f7a5f6c5 280EXPORT_SYMBOL(nfc_hci_target_discovered);
8b8d2e08
EL		 281
282void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
283 struct sk_buff *skb)
284{
285 int r = 0;
286
287 switch (event) {
288 case NFC_HCI_EVT_TARGET_DISCOVERED:
8b8d2e08
EL		 289 if (skb->len < 1) { /* no status data? */
290 r = -EPROTO;
291 goto exit;
292 }
293
294 if (skb->data[0] == 3) {
295 /* TODO: Multiple targets in field, none activated
296 * poll is supposedly stopped, but there is no
297 * single target to activate, so nothing to report
298 * up.
299 * if we need to restart poll, we must save the
300 * protocols from the initial poll and reuse here.
301 */
302 }
303
304 if (skb->data[0] != 0) {
305 r = -EPROTO;
306 goto exit;
307 }
308
309 r = nfc_hci_target_discovered(hdev,
310 nfc_hci_pipe2gate(hdev, pipe));
311 break;
312 default:
f7a5f6c5
AW		 313 if (hdev->ops->event_received) {
314 hdev->ops->event_received(hdev,
315 nfc_hci_pipe2gate(hdev, pipe),
316 event, skb);
317 return;
318 }
319
8b8d2e08
EL		 320 break;
321 }
322
323exit:
324 kfree_skb(skb);
325
326 if (r) {
327 /* TODO: There was an error dispatching the event,
328 * how to propagate up to nfc core?
329 */
330 }
331}
332
333static void nfc_hci_cmd_timeout(unsigned long data)
334{
335 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
336
916082b0 337 schedule_work(&hdev->msg_tx_work);
8b8d2e08
EL		 338}
339
340static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
a10d595b 341 struct nfc_hci_gate *gates)
8b8d2e08
EL		 342{
343 int r;
8b8d2e08 344 while (gate_count--) {
a10d595b
EL		 345 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
346 gates->gate, gates->pipe);
8b8d2e08
EL		 347 if (r < 0)
348 return r;
a10d595b 349 gates++;
8b8d2e08
EL		 350 }
351
352 return 0;
353}
354
355static int hci_dev_session_init(struct nfc_hci_dev *hdev)
356{
357 struct sk_buff *skb = NULL;
358 int r;
a10d595b
EL		 359
360 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
361 return -EPROTO;
8b8d2e08
EL		 362
363 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
a10d595b
EL		 364 hdev->init_data.gates[0].gate,
365 hdev->init_data.gates[0].pipe);
8b8d2e08
EL		 366 if (r < 0)
367 goto exit;
368
369 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
370 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
371 if (r < 0)
372 goto disconnect_all;
373
374 if (skb->len && skb->len == strlen(hdev->init_data.session_id))
375 if (memcmp(hdev->init_data.session_id, skb->data,
376 skb->len) == 0) {
377 /* TODO ELa: restore gate<->pipe table from
378 * some TBD location.
379 * note: it doesn't seem possible to get the chip
380 * currently open gate/pipe table.
381 * It is only possible to obtain the supported
382 * gate list.
383 */
384
385 /* goto exit
386 * For now, always do a full initialization */
387 }
388
389 r = nfc_hci_disconnect_all_gates(hdev);
390 if (r < 0)
391 goto exit;
392
8b8d2e08
EL		 393 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
394 hdev->init_data.gates);
395 if (r < 0)
396 goto disconnect_all;
397
398 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
399 NFC_HCI_ADMIN_SESSION_IDENTITY,
400 hdev->init_data.session_id,
401 strlen(hdev->init_data.session_id));
402 if (r == 0)
403 goto exit;
404
405disconnect_all:
406 nfc_hci_disconnect_all_gates(hdev);
407
408exit:
33e59713 409 kfree_skb(skb);
8b8d2e08
EL		 410
411 return r;
412}
413
414static int hci_dev_version(struct nfc_hci_dev *hdev)
415{
416 int r;
417 struct sk_buff *skb;
418
419 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
420 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
421 if (r < 0)
422 return r;
423
424 if (skb->len != 3) {
425 kfree_skb(skb);
426 return -EINVAL;
427 }
428
429 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
430 hdev->sw_patch = skb->data[0] & 0x0f;
431 hdev->sw_flashlib_major = skb->data[1];
432 hdev->sw_flashlib_minor = skb->data[2];
433
434 kfree_skb(skb);
435
436 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
437 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
438 if (r < 0)
439 return r;
440
441 if (skb->len != 3) {
442 kfree_skb(skb);
443 return -EINVAL;
444 }
445
446 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
447 hdev->hw_version = skb->data[0] & 0x1f;
448 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
449 hdev->hw_software = skb->data[1] & 0x3f;
450 hdev->hw_bsid = skb->data[2];
451
452 kfree_skb(skb);
453
454 pr_info("SOFTWARE INFO:\n");
455 pr_info("RomLib : %d\n", hdev->sw_romlib);
456 pr_info("Patch : %d\n", hdev->sw_patch);
457 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
458 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
459 pr_info("HARDWARE INFO:\n");
460 pr_info("Derivative : %d\n", hdev->hw_derivative);
461 pr_info("HW Version : %d\n", hdev->hw_version);
462 pr_info("#MPW : %d\n", hdev->hw_mpw);
463 pr_info("Software : %d\n", hdev->hw_software);
464 pr_info("BSID Version : %d\n", hdev->hw_bsid);
465
466 return 0;
467}
468
469static int hci_dev_up(struct nfc_dev *nfc_dev)
470{
471 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
472 int r = 0;
473
474 if (hdev->ops->open) {
475 r = hdev->ops->open(hdev);
476 if (r < 0)
477 return r;
478 }
479
412fda53
EL		 480 r = nfc_llc_start(hdev->llc);
481 if (r < 0)
482 goto exit_close;
483
8b8d2e08
EL		 484 r = hci_dev_session_init(hdev);
485 if (r < 0)
412fda53 486 goto exit_llc;
8b8d2e08
EL		 487
488 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
489 NFC_HCI_EVT_END_OPERATION, NULL, 0);
490 if (r < 0)
412fda53 491 goto exit_llc;
8b8d2e08
EL		 492
493 if (hdev->ops->hci_ready) {
494 r = hdev->ops->hci_ready(hdev);
495 if (r < 0)
412fda53 496 goto exit_llc;
8b8d2e08
EL		 497 }
498
499 r = hci_dev_version(hdev);
500 if (r < 0)
412fda53
EL		 501 goto exit_llc;
502
503 return 0;
504
505exit_llc:
506 nfc_llc_stop(hdev->llc);
507
508exit_close:
509 if (hdev->ops->close)
510 hdev->ops->close(hdev);
8b8d2e08 511
8b8d2e08
EL		 512 return r;
513}
514
515static int hci_dev_down(struct nfc_dev *nfc_dev)
516{
517 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
518
412fda53
EL		 519 nfc_llc_stop(hdev->llc);
520
8b8d2e08
EL		 521 if (hdev->ops->close)
522 hdev->ops->close(hdev);
523
524 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
525
526 return 0;
527}
528
fe7c5800
SO		 529static int hci_start_poll(struct nfc_dev *nfc_dev,
530 u32 im_protocols, u32 tm_protocols)
8b8d2e08
EL		 531{
532 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
8b8d2e08
EL		 533
534 if (hdev->ops->start_poll)
fe7c5800 535 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
8b8d2e08 536 else
03bed29e 537 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
8b8d2e08 538 NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
8b8d2e08
EL		 539}
540
541static void hci_stop_poll(struct nfc_dev *nfc_dev)
542{
543 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
544
03bed29e
EL		 545 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
546 NFC_HCI_EVT_END_OPERATION, NULL, 0);
8b8d2e08
EL		 547}
548
90099433
EL		 549static int hci_activate_target(struct nfc_dev *nfc_dev,
550 struct nfc_target *target, u32 protocol)
8b8d2e08 551{
8b8d2e08
EL		 552 return 0;
553}
554
90099433
EL		 555static void hci_deactivate_target(struct nfc_dev *nfc_dev,
556 struct nfc_target *target)
8b8d2e08
EL		 557{
558}
559
f3e8fb55
EL		 560#define HCI_CB_TYPE_TRANSCEIVE 1
561
562static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
563{
564 struct nfc_hci_dev *hdev = context;
565
566 switch (hdev->async_cb_type) {
567 case HCI_CB_TYPE_TRANSCEIVE:
568 /*
569 * TODO: Check RF Error indicator to make sure data is valid.
570 * It seems that HCI cmd can complete without error, but data
571 * can be invalid if an RF error occured? Ignore for now.
572 */
573 if (err == 0)
574 skb_trim(skb, skb->len - 1); /* RF Err ind */
575
576 hdev->async_cb(hdev->async_cb_context, skb, err);
577 break;
578 default:
579 if (err == 0)
580 kfree_skb(skb);
581 break;
582 }
583}
584
be9ae4ce
SO		 585static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
586 struct sk_buff *skb, data_exchange_cb_t cb,
587 void *cb_context)
8b8d2e08
EL		 588{
589 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
590 int r;
8b8d2e08 591
90099433 592 pr_debug("target_idx=%d\n", target->idx);
8b8d2e08
EL		 593
594 switch (target->hci_reader_gate) {
595 case NFC_HCI_RF_READER_A_GATE:
596 case NFC_HCI_RF_READER_B_GATE:
597 if (hdev->ops->data_exchange) {
f3e8fb55
EL		 598 r = hdev->ops->data_exchange(hdev, target, skb, cb,
599 cb_context);
8b8d2e08
EL		 600 if (r <= 0) /* handled */
601 break;
602 }
603
604 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
f3e8fb55
EL		 605
606 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
607 hdev->async_cb = cb;
608 hdev->async_cb_context = cb_context;
609
610 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
611 NFC_HCI_WR_XCHG_DATA, skb->data,
612 skb->len, hci_transceive_cb, hdev);
8b8d2e08
EL		 613 break;
614 default:
615 if (hdev->ops->data_exchange) {
f3e8fb55
EL		 616 r = hdev->ops->data_exchange(hdev, target, skb, cb,
617 cb_context);
8b8d2e08
EL		 618 if (r == 1)
619 r = -ENOTSUPP;
620 }
621 else
622 r = -ENOTSUPP;
f3e8fb55 623 break;
8b8d2e08
EL		 624 }
625
626 kfree_skb(skb);
627
f3e8fb55 628 return r;
8b8d2e08
EL		 629}
630
1676f751
EL		 631static int hci_check_presence(struct nfc_dev *nfc_dev,
632 struct nfc_target *target)
633{
634 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
635
636 if (hdev->ops->check_presence)
637 return hdev->ops->check_presence(hdev, target);
638
639 return 0;
640}
641
412fda53
EL		 642static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
643{
644 mutex_lock(&hdev->msg_tx_mutex);
645
646 if (hdev->cmd_pending_msg == NULL) {
647 nfc_driver_failure(hdev->ndev, err);
648 goto exit;
649 }
650
651 __nfc_hci_cmd_completion(hdev, err, NULL);
652
653exit:
654 mutex_unlock(&hdev->msg_tx_mutex);
655}
656
657static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
658{
659 nfc_hci_failure(hdev, err);
660}
661
662static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
663{
664 struct hcp_packet *packet;
665 u8 type;
666 u8 instruction;
667 struct sk_buff *hcp_skb;
668 u8 pipe;
669 struct sk_buff *frag_skb;
670 int msg_len;
671
672 packet = (struct hcp_packet *)skb->data;
673 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
674 skb_queue_tail(&hdev->rx_hcp_frags, skb);
675 return;
676 }
677
678 /* it's the last fragment. Does it need re-aggregation? */
679 if (skb_queue_len(&hdev->rx_hcp_frags)) {
680 pipe = packet->header & NFC_HCI_FRAGMENT;
681 skb_queue_tail(&hdev->rx_hcp_frags, skb);
682
683 msg_len = 0;
684 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
685 msg_len += (frag_skb->len -
686 NFC_HCI_HCP_PACKET_HEADER_LEN);
687 }
688
689 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
690 msg_len, GFP_KERNEL);
691 if (hcp_skb == NULL) {
692 nfc_hci_failure(hdev, -ENOMEM);
693 return;
694 }
695
696 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
697
698 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
699 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
700 memcpy(skb_put(hcp_skb, msg_len),
701 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
702 msg_len);
703 }
704
705 skb_queue_purge(&hdev->rx_hcp_frags);
706 } else {
707 packet->header &= NFC_HCI_FRAGMENT;
708 hcp_skb = skb;
709 }
710
711 /* if this is a response, dispatch immediately to
712 * unblock waiting cmd context. Otherwise, enqueue to dispatch
713 * in separate context where handler can also execute command.
714 */
715 packet = (struct hcp_packet *)hcp_skb->data;
716 type = HCP_MSG_GET_TYPE(packet->message.header);
717 if (type == NFC_HCI_HCP_RESPONSE) {
718 pipe = packet->header;
719 instruction = HCP_MSG_GET_CMD(packet->message.header);
720 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
721 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
722 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
723 } else {
724 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
916082b0 725 schedule_work(&hdev->msg_rx_work);
412fda53
EL		 726 }
727}
728
bd007bea 729static struct nfc_ops hci_nfc_ops = {
8b8d2e08
EL		 730 .dev_up = hci_dev_up,
731 .dev_down = hci_dev_down,
732 .start_poll = hci_start_poll,
733 .stop_poll = hci_stop_poll,
734 .activate_target = hci_activate_target,
735 .deactivate_target = hci_deactivate_target,
be9ae4ce 736 .im_transceive = hci_transceive,
1676f751 737 .check_presence = hci_check_presence,
8b8d2e08
EL		 738};
739
740struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
741 struct nfc_hci_init_data *init_data,
742 u32 protocols,
412fda53 743 const char *llc_name,
8b8d2e08
EL		 744 int tx_headroom,
745 int tx_tailroom,
746 int max_link_payload)
747{
748 struct nfc_hci_dev *hdev;
749
750 if (ops->xmit == NULL)
751 return NULL;
752
753 if (protocols == 0)
754 return NULL;
755
756 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
757 if (hdev == NULL)
758 return NULL;
759
412fda53
EL		 760 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
761 nfc_hci_recv_from_llc, tx_headroom,
762 tx_tailroom, nfc_hci_llc_failure);
763 if (hdev->llc == NULL) {
764 kfree(hdev);
765 return NULL;
766 }
767
8b8d2e08
EL		 768 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
769 tx_headroom + HCI_CMDS_HEADROOM,
770 tx_tailroom);
771 if (!hdev->ndev) {
412fda53 772 nfc_llc_free(hdev->llc);
8b8d2e08
EL		 773 kfree(hdev);
774 return NULL;
775 }
776
777 hdev->ops = ops;
778 hdev->max_data_link_payload = max_link_payload;
779 hdev->init_data = *init_data;
780
781 nfc_set_drvdata(hdev->ndev, hdev);
782
783 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
784
785 return hdev;
786}
787EXPORT_SYMBOL(nfc_hci_allocate_device);
788
789void nfc_hci_free_device(struct nfc_hci_dev *hdev)
790{
791 nfc_free_device(hdev->ndev);
412fda53 792 nfc_llc_free(hdev->llc);
8b8d2e08
EL		 793 kfree(hdev);
794}
795EXPORT_SYMBOL(nfc_hci_free_device);
796
797int nfc_hci_register_device(struct nfc_hci_dev *hdev)
798{
8b8d2e08
EL		 799 mutex_init(&hdev->msg_tx_mutex);
800
801 INIT_LIST_HEAD(&hdev->msg_tx_queue);
802
803 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
8b8d2e08
EL		 804
805 init_timer(&hdev->cmd_timer);
806 hdev->cmd_timer.data = (unsigned long)hdev;
807 hdev->cmd_timer.function = nfc_hci_cmd_timeout;
808
809 skb_queue_head_init(&hdev->rx_hcp_frags);
810
811 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
8b8d2e08
EL		 812
813 skb_queue_head_init(&hdev->msg_rx_queue);
814
474fee3d 815 return nfc_register_device(hdev->ndev);
8b8d2e08
EL		 816}
817EXPORT_SYMBOL(nfc_hci_register_device);
818
819void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
820{
1913e57c 821 struct hci_msg *msg, *n;
8b8d2e08
EL		 822
823 skb_queue_purge(&hdev->rx_hcp_frags);
824 skb_queue_purge(&hdev->msg_rx_queue);
825
1913e57c 826 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
8b8d2e08
EL		 827 list_del(&msg->msg_l);
828 skb_queue_purge(&msg->msg_frags);
829 kfree(msg);
830 }
831
832 del_timer_sync(&hdev->cmd_timer);
833
834 nfc_unregister_device(hdev->ndev);
835
474fee3d
TH		 836 cancel_work_sync(&hdev->msg_tx_work);
837 cancel_work_sync(&hdev->msg_rx_work);
8b8d2e08
EL		 838}
839EXPORT_SYMBOL(nfc_hci_unregister_device);
840
841void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
842{
843 hdev->clientdata = clientdata;
844}
845EXPORT_SYMBOL(nfc_hci_set_clientdata);
846
847void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
848{
849 return hdev->clientdata;
850}
851EXPORT_SYMBOL(nfc_hci_get_clientdata);
852
72b06f75
EL		 853void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
854{
855 nfc_hci_failure(hdev, err);
856}
a9a741a7
EL		 857EXPORT_SYMBOL(nfc_hci_driver_failure);
858
412fda53 859void inline nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
8b8d2e08 860{
412fda53 861 nfc_llc_rcv_from_drv(hdev->llc, skb);
8b8d2e08
EL		 862}
863EXPORT_SYMBOL(nfc_hci_recv_frame);
864
67cccfe1
EL		 865static int __init nfc_hci_init(void)
866{
867 return nfc_llc_init();
868}
869
870static void __exit nfc_hci_exit(void)
871{
872 nfc_llc_exit();
873}
874
412fda53 875subsys_initcall(nfc_hci_init);
67cccfe1
EL		 876module_exit(nfc_hci_exit);
877
8b8d2e08 878MODULE_LICENSE("GPL");
80faa598 879MODULE_DESCRIPTION("NFC HCI Core");
Linux kernel - Deliverables
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