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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[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 #include <net/nfc/llc.h>
30
31 #include "hci.h"
32
33 /* Largest headroom needed for outgoing HCI commands */
34 #define HCI_CMDS_HEADROOM 1
35
36 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_REG_PAR_UNKNOWN:
42 return -EOPNOTSUPP;
43 case NFC_HCI_ANY_E_TIMEOUT:
44 return -ETIME;
45 default:
46 return -1;
47 }
48 }
49 EXPORT_SYMBOL(nfc_hci_result_to_errno);
50
51 static void nfc_hci_msg_tx_work(struct work_struct *work)
52 {
53 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
54 msg_tx_work);
55 struct hci_msg *msg;
56 struct sk_buff *skb;
57 int r = 0;
58
59 mutex_lock(&hdev->msg_tx_mutex);
60 if (hdev->shutting_down)
61 goto exit;
62
63 if (hdev->cmd_pending_msg) {
64 if (timer_pending(&hdev->cmd_timer) == 0) {
65 if (hdev->cmd_pending_msg->cb)
66 hdev->cmd_pending_msg->cb(hdev->
67 cmd_pending_msg->
68 cb_context,
69 NULL,
70 -ETIME);
71 kfree(hdev->cmd_pending_msg);
72 hdev->cmd_pending_msg = NULL;
73 } else {
74 goto exit;
75 }
76 }
77
78 next_msg:
79 if (list_empty(&hdev->msg_tx_queue))
80 goto exit;
81
82 msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
83 list_del(&msg->msg_l);
84
85 pr_debug("msg_tx_queue has a cmd to send\n");
86 while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
87 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
88 if (r < 0) {
89 kfree_skb(skb);
90 skb_queue_purge(&msg->msg_frags);
91 if (msg->cb)
92 msg->cb(msg->cb_context, NULL, r);
93 kfree(msg);
94 break;
95 }
96 }
97
98 if (r)
99 goto next_msg;
100
101 if (msg->wait_response == false) {
102 kfree(msg);
103 goto next_msg;
104 }
105
106 hdev->cmd_pending_msg = msg;
107 mod_timer(&hdev->cmd_timer, jiffies +
108 msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
109
110 exit:
111 mutex_unlock(&hdev->msg_tx_mutex);
112 }
113
114 static void nfc_hci_msg_rx_work(struct work_struct *work)
115 {
116 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
117 msg_rx_work);
118 struct sk_buff *skb;
119 struct hcp_message *message;
120 u8 pipe;
121 u8 type;
122 u8 instruction;
123
124 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
125 pipe = skb->data[0];
126 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
127 message = (struct hcp_message *)skb->data;
128 type = HCP_MSG_GET_TYPE(message->header);
129 instruction = HCP_MSG_GET_CMD(message->header);
130 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
131
132 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
133 }
134 }
135
136 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
137 struct sk_buff *skb)
138 {
139 del_timer_sync(&hdev->cmd_timer);
140
141 if (hdev->cmd_pending_msg->cb)
142 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
143 skb, err);
144 else
145 kfree_skb(skb);
146
147 kfree(hdev->cmd_pending_msg);
148 hdev->cmd_pending_msg = NULL;
149
150 schedule_work(&hdev->msg_tx_work);
151 }
152
153 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
154 struct sk_buff *skb)
155 {
156 mutex_lock(&hdev->msg_tx_mutex);
157
158 if (hdev->cmd_pending_msg == NULL) {
159 kfree_skb(skb);
160 goto exit;
161 }
162
163 __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
164
165 exit:
166 mutex_unlock(&hdev->msg_tx_mutex);
167 }
168
169 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
170 struct sk_buff *skb)
171 {
172 kfree_skb(skb);
173 }
174
175 u32 nfc_hci_sak_to_protocol(u8 sak)
176 {
177 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
178 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
179 return NFC_PROTO_MIFARE_MASK;
180 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
181 return NFC_PROTO_ISO14443_MASK;
182 case NFC_HCI_TYPE_A_SEL_PROT_DEP:
183 return NFC_PROTO_NFC_DEP_MASK;
184 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
185 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
186 default:
187 return 0xffffffff;
188 }
189 }
190 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
191
192 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
193 {
194 struct nfc_target *targets;
195 struct sk_buff *atqa_skb = NULL;
196 struct sk_buff *sak_skb = NULL;
197 struct sk_buff *uid_skb = NULL;
198 int r;
199
200 pr_debug("from gate %d\n", gate);
201
202 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
203 if (targets == NULL)
204 return -ENOMEM;
205
206 switch (gate) {
207 case NFC_HCI_RF_READER_A_GATE:
208 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
209 NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
210 if (r < 0)
211 goto exit;
212
213 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
214 NFC_HCI_RF_READER_A_SAK, &sak_skb);
215 if (r < 0)
216 goto exit;
217
218 if (atqa_skb->len != 2 || sak_skb->len != 1) {
219 r = -EPROTO;
220 goto exit;
221 }
222
223 targets->supported_protocols =
224 nfc_hci_sak_to_protocol(sak_skb->data[0]);
225 if (targets->supported_protocols == 0xffffffff) {
226 r = -EPROTO;
227 goto exit;
228 }
229
230 targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
231 targets->sel_res = sak_skb->data[0];
232
233 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
234 NFC_HCI_RF_READER_A_UID, &uid_skb);
235 if (r < 0)
236 goto exit;
237
238 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
239 r = -EPROTO;
240 goto exit;
241 }
242
243 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
244 targets->nfcid1_len = uid_skb->len;
245
246 if (hdev->ops->complete_target_discovered) {
247 r = hdev->ops->complete_target_discovered(hdev, gate,
248 targets);
249 if (r < 0)
250 goto exit;
251 }
252 break;
253 case NFC_HCI_RF_READER_B_GATE:
254 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
255 break;
256 default:
257 if (hdev->ops->target_from_gate)
258 r = hdev->ops->target_from_gate(hdev, gate, targets);
259 else
260 r = -EPROTO;
261 if (r < 0)
262 goto exit;
263
264 if (hdev->ops->complete_target_discovered) {
265 r = hdev->ops->complete_target_discovered(hdev, gate,
266 targets);
267 if (r < 0)
268 goto exit;
269 }
270 break;
271 }
272
273 /* if driver set the new gate, we will skip the old one */
274 if (targets->hci_reader_gate == 0x00)
275 targets->hci_reader_gate = gate;
276
277 r = nfc_targets_found(hdev->ndev, targets, 1);
278
279 exit:
280 kfree(targets);
281 kfree_skb(atqa_skb);
282 kfree_skb(sak_skb);
283 kfree_skb(uid_skb);
284
285 return r;
286 }
287 EXPORT_SYMBOL(nfc_hci_target_discovered);
288
289 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
290 struct sk_buff *skb)
291 {
292 int r = 0;
293 u8 gate = nfc_hci_pipe2gate(hdev, pipe);
294
295 if (gate == 0xff) {
296 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
297 goto exit;
298 }
299
300 if (hdev->ops->event_received) {
301 r = hdev->ops->event_received(hdev, gate, event, skb);
302 if (r <= 0)
303 goto exit_noskb;
304 }
305
306 switch (event) {
307 case NFC_HCI_EVT_TARGET_DISCOVERED:
308 if (skb->len < 1) { /* no status data? */
309 r = -EPROTO;
310 goto exit;
311 }
312
313 if (skb->data[0] == 3) {
314 /* TODO: Multiple targets in field, none activated
315 * poll is supposedly stopped, but there is no
316 * single target to activate, so nothing to report
317 * up.
318 * if we need to restart poll, we must save the
319 * protocols from the initial poll and reuse here.
320 */
321 }
322
323 if (skb->data[0] != 0) {
324 r = -EPROTO;
325 goto exit;
326 }
327
328 r = nfc_hci_target_discovered(hdev, gate);
329 break;
330 default:
331 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
332 r = -EINVAL;
333 break;
334 }
335
336 exit:
337 kfree_skb(skb);
338
339 exit_noskb:
340 if (r) {
341 /* TODO: There was an error dispatching the event,
342 * how to propagate up to nfc core?
343 */
344 }
345 }
346
347 static void nfc_hci_cmd_timeout(unsigned long data)
348 {
349 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
350
351 schedule_work(&hdev->msg_tx_work);
352 }
353
354 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
355 struct nfc_hci_gate *gates)
356 {
357 int r;
358 while (gate_count--) {
359 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
360 gates->gate, gates->pipe);
361 if (r < 0)
362 return r;
363 gates++;
364 }
365
366 return 0;
367 }
368
369 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
370 {
371 struct sk_buff *skb = NULL;
372 int r;
373
374 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
375 return -EPROTO;
376
377 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
378 hdev->init_data.gates[0].gate,
379 hdev->init_data.gates[0].pipe);
380 if (r < 0)
381 goto exit;
382
383 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
384 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
385 if (r < 0)
386 goto disconnect_all;
387
388 if (skb->len && skb->len == strlen(hdev->init_data.session_id))
389 if (memcmp(hdev->init_data.session_id, skb->data,
390 skb->len) == 0) {
391 /* TODO ELa: restore gate<->pipe table from
392 * some TBD location.
393 * note: it doesn't seem possible to get the chip
394 * currently open gate/pipe table.
395 * It is only possible to obtain the supported
396 * gate list.
397 */
398
399 /* goto exit
400 * For now, always do a full initialization */
401 }
402
403 r = nfc_hci_disconnect_all_gates(hdev);
404 if (r < 0)
405 goto exit;
406
407 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
408 hdev->init_data.gates);
409 if (r < 0)
410 goto disconnect_all;
411
412 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
413 NFC_HCI_ADMIN_SESSION_IDENTITY,
414 hdev->init_data.session_id,
415 strlen(hdev->init_data.session_id));
416 if (r == 0)
417 goto exit;
418
419 disconnect_all:
420 nfc_hci_disconnect_all_gates(hdev);
421
422 exit:
423 kfree_skb(skb);
424
425 return r;
426 }
427
428 static int hci_dev_version(struct nfc_hci_dev *hdev)
429 {
430 int r;
431 struct sk_buff *skb;
432
433 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
434 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
435 if (r == -EOPNOTSUPP) {
436 pr_info("Software/Hardware info not available\n");
437 return 0;
438 }
439 if (r < 0)
440 return r;
441
442 if (skb->len != 3) {
443 kfree_skb(skb);
444 return -EINVAL;
445 }
446
447 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
448 hdev->sw_patch = skb->data[0] & 0x0f;
449 hdev->sw_flashlib_major = skb->data[1];
450 hdev->sw_flashlib_minor = skb->data[2];
451
452 kfree_skb(skb);
453
454 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
455 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
456 if (r < 0)
457 return r;
458
459 if (skb->len != 3) {
460 kfree_skb(skb);
461 return -EINVAL;
462 }
463
464 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
465 hdev->hw_version = skb->data[0] & 0x1f;
466 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
467 hdev->hw_software = skb->data[1] & 0x3f;
468 hdev->hw_bsid = skb->data[2];
469
470 kfree_skb(skb);
471
472 pr_info("SOFTWARE INFO:\n");
473 pr_info("RomLib : %d\n", hdev->sw_romlib);
474 pr_info("Patch : %d\n", hdev->sw_patch);
475 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
476 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
477 pr_info("HARDWARE INFO:\n");
478 pr_info("Derivative : %d\n", hdev->hw_derivative);
479 pr_info("HW Version : %d\n", hdev->hw_version);
480 pr_info("#MPW : %d\n", hdev->hw_mpw);
481 pr_info("Software : %d\n", hdev->hw_software);
482 pr_info("BSID Version : %d\n", hdev->hw_bsid);
483
484 return 0;
485 }
486
487 static int hci_dev_up(struct nfc_dev *nfc_dev)
488 {
489 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
490 int r = 0;
491
492 if (hdev->ops->open) {
493 r = hdev->ops->open(hdev);
494 if (r < 0)
495 return r;
496 }
497
498 r = nfc_llc_start(hdev->llc);
499 if (r < 0)
500 goto exit_close;
501
502 r = hci_dev_session_init(hdev);
503 if (r < 0)
504 goto exit_llc;
505
506 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
507 NFC_HCI_EVT_END_OPERATION, NULL, 0);
508 if (r < 0)
509 goto exit_llc;
510
511 if (hdev->ops->hci_ready) {
512 r = hdev->ops->hci_ready(hdev);
513 if (r < 0)
514 goto exit_llc;
515 }
516
517 r = hci_dev_version(hdev);
518 if (r < 0)
519 goto exit_llc;
520
521 return 0;
522
523 exit_llc:
524 nfc_llc_stop(hdev->llc);
525
526 exit_close:
527 if (hdev->ops->close)
528 hdev->ops->close(hdev);
529
530 return r;
531 }
532
533 static int hci_dev_down(struct nfc_dev *nfc_dev)
534 {
535 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
536
537 nfc_llc_stop(hdev->llc);
538
539 if (hdev->ops->close)
540 hdev->ops->close(hdev);
541
542 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
543
544 return 0;
545 }
546
547 static int hci_start_poll(struct nfc_dev *nfc_dev,
548 u32 im_protocols, u32 tm_protocols)
549 {
550 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
551
552 if (hdev->ops->start_poll)
553 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
554 else
555 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
556 NFC_HCI_EVT_READER_REQUESTED,
557 NULL, 0);
558 }
559
560 static void hci_stop_poll(struct nfc_dev *nfc_dev)
561 {
562 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
563
564 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
565 NFC_HCI_EVT_END_OPERATION, NULL, 0);
566 }
567
568 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
569 __u8 comm_mode, __u8 *gb, size_t gb_len)
570 {
571 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
572
573 if (!hdev->ops->dep_link_up)
574 return 0;
575
576 return hdev->ops->dep_link_up(hdev, target, comm_mode,
577 gb, gb_len);
578 }
579
580 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
581 {
582 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
583
584 if (!hdev->ops->dep_link_down)
585 return 0;
586
587 return hdev->ops->dep_link_down(hdev);
588 }
589
590 static int hci_activate_target(struct nfc_dev *nfc_dev,
591 struct nfc_target *target, u32 protocol)
592 {
593 return 0;
594 }
595
596 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
597 struct nfc_target *target)
598 {
599 }
600
601 #define HCI_CB_TYPE_TRANSCEIVE 1
602
603 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
604 {
605 struct nfc_hci_dev *hdev = context;
606
607 switch (hdev->async_cb_type) {
608 case HCI_CB_TYPE_TRANSCEIVE:
609 /*
610 * TODO: Check RF Error indicator to make sure data is valid.
611 * It seems that HCI cmd can complete without error, but data
612 * can be invalid if an RF error occured? Ignore for now.
613 */
614 if (err == 0)
615 skb_trim(skb, skb->len - 1); /* RF Err ind */
616
617 hdev->async_cb(hdev->async_cb_context, skb, err);
618 break;
619 default:
620 if (err == 0)
621 kfree_skb(skb);
622 break;
623 }
624 }
625
626 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
627 struct sk_buff *skb, data_exchange_cb_t cb,
628 void *cb_context)
629 {
630 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
631 int r;
632
633 pr_debug("target_idx=%d\n", target->idx);
634
635 switch (target->hci_reader_gate) {
636 case NFC_HCI_RF_READER_A_GATE:
637 case NFC_HCI_RF_READER_B_GATE:
638 if (hdev->ops->im_transceive) {
639 r = hdev->ops->im_transceive(hdev, target, skb, cb,
640 cb_context);
641 if (r <= 0) /* handled */
642 break;
643 }
644
645 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
646
647 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
648 hdev->async_cb = cb;
649 hdev->async_cb_context = cb_context;
650
651 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
652 NFC_HCI_WR_XCHG_DATA, skb->data,
653 skb->len, hci_transceive_cb, hdev);
654 break;
655 default:
656 if (hdev->ops->im_transceive) {
657 r = hdev->ops->im_transceive(hdev, target, skb, cb,
658 cb_context);
659 if (r == 1)
660 r = -ENOTSUPP;
661 } else {
662 r = -ENOTSUPP;
663 }
664 break;
665 }
666
667 kfree_skb(skb);
668
669 return r;
670 }
671
672 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
673 {
674 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
675
676 if (!hdev->ops->tm_send) {
677 kfree_skb(skb);
678 return -ENOTSUPP;
679 }
680
681 return hdev->ops->tm_send(hdev, skb);
682 }
683
684 static int hci_check_presence(struct nfc_dev *nfc_dev,
685 struct nfc_target *target)
686 {
687 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
688
689 if (!hdev->ops->check_presence)
690 return 0;
691
692 return hdev->ops->check_presence(hdev, target);
693 }
694
695 static int hci_discover_se(struct nfc_dev *nfc_dev)
696 {
697 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
698
699 if (hdev->ops->discover_se)
700 return hdev->ops->discover_se(hdev);
701
702 return 0;
703 }
704
705 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
706 {
707 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
708
709 if (hdev->ops->enable_se)
710 return hdev->ops->enable_se(hdev, se_idx);
711
712 return 0;
713 }
714
715 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
716 {
717 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
718
719 if (hdev->ops->disable_se)
720 return hdev->ops->enable_se(hdev, se_idx);
721
722 return 0;
723 }
724
725 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
726 {
727 mutex_lock(&hdev->msg_tx_mutex);
728
729 if (hdev->cmd_pending_msg == NULL) {
730 nfc_driver_failure(hdev->ndev, err);
731 goto exit;
732 }
733
734 __nfc_hci_cmd_completion(hdev, err, NULL);
735
736 exit:
737 mutex_unlock(&hdev->msg_tx_mutex);
738 }
739
740 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
741 {
742 nfc_hci_failure(hdev, err);
743 }
744
745 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
746 {
747 struct hcp_packet *packet;
748 u8 type;
749 u8 instruction;
750 struct sk_buff *hcp_skb;
751 u8 pipe;
752 struct sk_buff *frag_skb;
753 int msg_len;
754
755 packet = (struct hcp_packet *)skb->data;
756 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
757 skb_queue_tail(&hdev->rx_hcp_frags, skb);
758 return;
759 }
760
761 /* it's the last fragment. Does it need re-aggregation? */
762 if (skb_queue_len(&hdev->rx_hcp_frags)) {
763 pipe = packet->header & NFC_HCI_FRAGMENT;
764 skb_queue_tail(&hdev->rx_hcp_frags, skb);
765
766 msg_len = 0;
767 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
768 msg_len += (frag_skb->len -
769 NFC_HCI_HCP_PACKET_HEADER_LEN);
770 }
771
772 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
773 msg_len, GFP_KERNEL);
774 if (hcp_skb == NULL) {
775 nfc_hci_failure(hdev, -ENOMEM);
776 return;
777 }
778
779 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
780
781 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
782 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
783 memcpy(skb_put(hcp_skb, msg_len),
784 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
785 msg_len);
786 }
787
788 skb_queue_purge(&hdev->rx_hcp_frags);
789 } else {
790 packet->header &= NFC_HCI_FRAGMENT;
791 hcp_skb = skb;
792 }
793
794 /* if this is a response, dispatch immediately to
795 * unblock waiting cmd context. Otherwise, enqueue to dispatch
796 * in separate context where handler can also execute command.
797 */
798 packet = (struct hcp_packet *)hcp_skb->data;
799 type = HCP_MSG_GET_TYPE(packet->message.header);
800 if (type == NFC_HCI_HCP_RESPONSE) {
801 pipe = packet->header;
802 instruction = HCP_MSG_GET_CMD(packet->message.header);
803 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
804 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
805 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
806 } else {
807 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
808 schedule_work(&hdev->msg_rx_work);
809 }
810 }
811
812 static int hci_fw_upload(struct nfc_dev *nfc_dev, const char *firmware_name)
813 {
814 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
815
816 if (!hdev->ops->fw_upload)
817 return -ENOTSUPP;
818
819 return hdev->ops->fw_upload(hdev, firmware_name);
820 }
821
822 static struct nfc_ops hci_nfc_ops = {
823 .dev_up = hci_dev_up,
824 .dev_down = hci_dev_down,
825 .start_poll = hci_start_poll,
826 .stop_poll = hci_stop_poll,
827 .dep_link_up = hci_dep_link_up,
828 .dep_link_down = hci_dep_link_down,
829 .activate_target = hci_activate_target,
830 .deactivate_target = hci_deactivate_target,
831 .im_transceive = hci_transceive,
832 .tm_send = hci_tm_send,
833 .check_presence = hci_check_presence,
834 .fw_upload = hci_fw_upload,
835 .discover_se = hci_discover_se,
836 .enable_se = hci_enable_se,
837 .disable_se = hci_disable_se,
838 };
839
840 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
841 struct nfc_hci_init_data *init_data,
842 unsigned long quirks,
843 u32 protocols,
844 const char *llc_name,
845 int tx_headroom,
846 int tx_tailroom,
847 int max_link_payload)
848 {
849 struct nfc_hci_dev *hdev;
850
851 if (ops->xmit == NULL)
852 return NULL;
853
854 if (protocols == 0)
855 return NULL;
856
857 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
858 if (hdev == NULL)
859 return NULL;
860
861 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
862 nfc_hci_recv_from_llc, tx_headroom,
863 tx_tailroom, nfc_hci_llc_failure);
864 if (hdev->llc == NULL) {
865 kfree(hdev);
866 return NULL;
867 }
868
869 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
870 tx_headroom + HCI_CMDS_HEADROOM,
871 tx_tailroom);
872 if (!hdev->ndev) {
873 nfc_llc_free(hdev->llc);
874 kfree(hdev);
875 return NULL;
876 }
877
878 hdev->ops = ops;
879 hdev->max_data_link_payload = max_link_payload;
880 hdev->init_data = *init_data;
881
882 nfc_set_drvdata(hdev->ndev, hdev);
883
884 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
885
886 hdev->quirks = quirks;
887
888 return hdev;
889 }
890 EXPORT_SYMBOL(nfc_hci_allocate_device);
891
892 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
893 {
894 nfc_free_device(hdev->ndev);
895 nfc_llc_free(hdev->llc);
896 kfree(hdev);
897 }
898 EXPORT_SYMBOL(nfc_hci_free_device);
899
900 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
901 {
902 mutex_init(&hdev->msg_tx_mutex);
903
904 INIT_LIST_HEAD(&hdev->msg_tx_queue);
905
906 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
907
908 init_timer(&hdev->cmd_timer);
909 hdev->cmd_timer.data = (unsigned long)hdev;
910 hdev->cmd_timer.function = nfc_hci_cmd_timeout;
911
912 skb_queue_head_init(&hdev->rx_hcp_frags);
913
914 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
915
916 skb_queue_head_init(&hdev->msg_rx_queue);
917
918 return nfc_register_device(hdev->ndev);
919 }
920 EXPORT_SYMBOL(nfc_hci_register_device);
921
922 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
923 {
924 struct hci_msg *msg, *n;
925
926 mutex_lock(&hdev->msg_tx_mutex);
927
928 if (hdev->cmd_pending_msg) {
929 if (hdev->cmd_pending_msg->cb)
930 hdev->cmd_pending_msg->cb(
931 hdev->cmd_pending_msg->cb_context,
932 NULL, -ESHUTDOWN);
933 kfree(hdev->cmd_pending_msg);
934 hdev->cmd_pending_msg = NULL;
935 }
936
937 hdev->shutting_down = true;
938
939 mutex_unlock(&hdev->msg_tx_mutex);
940
941 del_timer_sync(&hdev->cmd_timer);
942 cancel_work_sync(&hdev->msg_tx_work);
943
944 cancel_work_sync(&hdev->msg_rx_work);
945
946 nfc_unregister_device(hdev->ndev);
947
948 skb_queue_purge(&hdev->rx_hcp_frags);
949 skb_queue_purge(&hdev->msg_rx_queue);
950
951 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
952 list_del(&msg->msg_l);
953 skb_queue_purge(&msg->msg_frags);
954 kfree(msg);
955 }
956 }
957 EXPORT_SYMBOL(nfc_hci_unregister_device);
958
959 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
960 {
961 hdev->clientdata = clientdata;
962 }
963 EXPORT_SYMBOL(nfc_hci_set_clientdata);
964
965 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
966 {
967 return hdev->clientdata;
968 }
969 EXPORT_SYMBOL(nfc_hci_get_clientdata);
970
971 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
972 {
973 nfc_hci_failure(hdev, err);
974 }
975 EXPORT_SYMBOL(nfc_hci_driver_failure);
976
977 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
978 {
979 nfc_llc_rcv_from_drv(hdev->llc, skb);
980 }
981 EXPORT_SYMBOL(nfc_hci_recv_frame);
982
983 static int __init nfc_hci_init(void)
984 {
985 return nfc_llc_init();
986 }
987
988 static void __exit nfc_hci_exit(void)
989 {
990 nfc_llc_exit();
991 }
992
993 subsys_initcall(nfc_hci_init);
994 module_exit(nfc_hci_exit);
995
996 MODULE_LICENSE("GPL");
997 MODULE_DESCRIPTION("NFC HCI Core");
Linux kernel - Deliverables
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