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NFC: hci: Add cmd_received handler
[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, see <http://www.gnu.org/licenses/>.
16 */
17
18 #define pr_fmt(fmt) "hci: %s: " fmt, __func__
19
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/nfc.h>
24
25 #include <net/nfc/nfc.h>
26 #include <net/nfc/hci.h>
27 #include <net/nfc/llc.h>
28
29 #include "hci.h"
30
31 /* Largest headroom needed for outgoing HCI commands */
32 #define HCI_CMDS_HEADROOM 1
33
34 int nfc_hci_result_to_errno(u8 result)
35 {
36 switch (result) {
37 case NFC_HCI_ANY_OK:
38 return 0;
39 case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
40 return -EOPNOTSUPP;
41 case NFC_HCI_ANY_E_TIMEOUT:
42 return -ETIME;
43 default:
44 return -1;
45 }
46 }
47 EXPORT_SYMBOL(nfc_hci_result_to_errno);
48
49 void nfc_hci_reset_pipes(struct nfc_hci_dev *hdev)
50 {
51 int i = 0;
52
53 for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
54 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
55 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
56 }
57 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
58 }
59 EXPORT_SYMBOL(nfc_hci_reset_pipes);
60
61 void nfc_hci_reset_pipes_per_host(struct nfc_hci_dev *hdev, u8 host)
62 {
63 int i = 0;
64
65 for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
66 if (hdev->pipes[i].dest_host != host)
67 continue;
68
69 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
70 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
71 }
72 }
73 EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
74
75 static void nfc_hci_msg_tx_work(struct work_struct *work)
76 {
77 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
78 msg_tx_work);
79 struct hci_msg *msg;
80 struct sk_buff *skb;
81 int r = 0;
82
83 mutex_lock(&hdev->msg_tx_mutex);
84 if (hdev->shutting_down)
85 goto exit;
86
87 if (hdev->cmd_pending_msg) {
88 if (timer_pending(&hdev->cmd_timer) == 0) {
89 if (hdev->cmd_pending_msg->cb)
90 hdev->cmd_pending_msg->cb(hdev->
91 cmd_pending_msg->
92 cb_context,
93 NULL,
94 -ETIME);
95 kfree(hdev->cmd_pending_msg);
96 hdev->cmd_pending_msg = NULL;
97 } else {
98 goto exit;
99 }
100 }
101
102 next_msg:
103 if (list_empty(&hdev->msg_tx_queue))
104 goto exit;
105
106 msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
107 list_del(&msg->msg_l);
108
109 pr_debug("msg_tx_queue has a cmd to send\n");
110 while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
111 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
112 if (r < 0) {
113 kfree_skb(skb);
114 skb_queue_purge(&msg->msg_frags);
115 if (msg->cb)
116 msg->cb(msg->cb_context, NULL, r);
117 kfree(msg);
118 break;
119 }
120 }
121
122 if (r)
123 goto next_msg;
124
125 if (msg->wait_response == false) {
126 kfree(msg);
127 goto next_msg;
128 }
129
130 hdev->cmd_pending_msg = msg;
131 mod_timer(&hdev->cmd_timer, jiffies +
132 msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
133
134 exit:
135 mutex_unlock(&hdev->msg_tx_mutex);
136 }
137
138 static void nfc_hci_msg_rx_work(struct work_struct *work)
139 {
140 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
141 msg_rx_work);
142 struct sk_buff *skb;
143 struct hcp_message *message;
144 u8 pipe;
145 u8 type;
146 u8 instruction;
147
148 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
149 pipe = skb->data[0];
150 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
151 message = (struct hcp_message *)skb->data;
152 type = HCP_MSG_GET_TYPE(message->header);
153 instruction = HCP_MSG_GET_CMD(message->header);
154 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
155
156 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
157 }
158 }
159
160 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
161 struct sk_buff *skb)
162 {
163 del_timer_sync(&hdev->cmd_timer);
164
165 if (hdev->cmd_pending_msg->cb)
166 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
167 skb, err);
168 else
169 kfree_skb(skb);
170
171 kfree(hdev->cmd_pending_msg);
172 hdev->cmd_pending_msg = NULL;
173
174 schedule_work(&hdev->msg_tx_work);
175 }
176
177 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
178 struct sk_buff *skb)
179 {
180 mutex_lock(&hdev->msg_tx_mutex);
181
182 if (hdev->cmd_pending_msg == NULL) {
183 kfree_skb(skb);
184 goto exit;
185 }
186
187 __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
188
189 exit:
190 mutex_unlock(&hdev->msg_tx_mutex);
191 }
192
193 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
194 struct sk_buff *skb)
195 {
196 u8 gate = hdev->pipes[pipe].gate;
197 u8 status = NFC_HCI_ANY_OK;
198 struct hci_create_pipe_resp *create_info;
199 struct hci_delete_pipe_noti *delete_info;
200 struct hci_all_pipe_cleared_noti *cleared_info;
201
202 pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
203
204 switch (cmd) {
205 case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
206 if (skb->len != 5) {
207 status = NFC_HCI_ANY_E_NOK;
208 goto exit;
209 }
210 create_info = (struct hci_create_pipe_resp *)skb->data;
211
212 /* Save the new created pipe and bind with local gate,
213 * the description for skb->data[3] is destination gate id
214 * but since we received this cmd from host controller, we
215 * are the destination and it is our local gate
216 */
217 hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
218 hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
219 hdev->pipes[create_info->pipe].dest_host =
220 create_info->src_host;
221 break;
222 case NFC_HCI_ANY_OPEN_PIPE:
223 if (gate == NFC_HCI_INVALID_GATE) {
224 status = NFC_HCI_ANY_E_NOK;
225 goto exit;
226 }
227 break;
228 case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
229 if (skb->len != 1) {
230 status = NFC_HCI_ANY_E_NOK;
231 goto exit;
232 }
233 delete_info = (struct hci_delete_pipe_noti *)skb->data;
234
235 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
236 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
237 break;
238 case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
239 if (skb->len != 1) {
240 status = NFC_HCI_ANY_E_NOK;
241 goto exit;
242 }
243 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
244
245 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
246 break;
247 default:
248 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
249 break;
250 }
251
252 if (hdev->ops->cmd_received)
253 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
254
255 exit:
256 nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
257 status, NULL, 0, NULL, NULL, 0);
258
259 kfree_skb(skb);
260 }
261
262 u32 nfc_hci_sak_to_protocol(u8 sak)
263 {
264 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
265 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
266 return NFC_PROTO_MIFARE_MASK;
267 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
268 return NFC_PROTO_ISO14443_MASK;
269 case NFC_HCI_TYPE_A_SEL_PROT_DEP:
270 return NFC_PROTO_NFC_DEP_MASK;
271 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
272 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
273 default:
274 return 0xffffffff;
275 }
276 }
277 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
278
279 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
280 {
281 struct nfc_target *targets;
282 struct sk_buff *atqa_skb = NULL;
283 struct sk_buff *sak_skb = NULL;
284 struct sk_buff *uid_skb = NULL;
285 int r;
286
287 pr_debug("from gate %d\n", gate);
288
289 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
290 if (targets == NULL)
291 return -ENOMEM;
292
293 switch (gate) {
294 case NFC_HCI_RF_READER_A_GATE:
295 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
296 NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
297 if (r < 0)
298 goto exit;
299
300 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
301 NFC_HCI_RF_READER_A_SAK, &sak_skb);
302 if (r < 0)
303 goto exit;
304
305 if (atqa_skb->len != 2 || sak_skb->len != 1) {
306 r = -EPROTO;
307 goto exit;
308 }
309
310 targets->supported_protocols =
311 nfc_hci_sak_to_protocol(sak_skb->data[0]);
312 if (targets->supported_protocols == 0xffffffff) {
313 r = -EPROTO;
314 goto exit;
315 }
316
317 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
318 targets->sel_res = sak_skb->data[0];
319
320 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
321 NFC_HCI_RF_READER_A_UID, &uid_skb);
322 if (r < 0)
323 goto exit;
324
325 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
326 r = -EPROTO;
327 goto exit;
328 }
329
330 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
331 targets->nfcid1_len = uid_skb->len;
332
333 if (hdev->ops->complete_target_discovered) {
334 r = hdev->ops->complete_target_discovered(hdev, gate,
335 targets);
336 if (r < 0)
337 goto exit;
338 }
339 break;
340 case NFC_HCI_RF_READER_B_GATE:
341 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
342 break;
343 default:
344 if (hdev->ops->target_from_gate)
345 r = hdev->ops->target_from_gate(hdev, gate, targets);
346 else
347 r = -EPROTO;
348 if (r < 0)
349 goto exit;
350
351 if (hdev->ops->complete_target_discovered) {
352 r = hdev->ops->complete_target_discovered(hdev, gate,
353 targets);
354 if (r < 0)
355 goto exit;
356 }
357 break;
358 }
359
360 /* if driver set the new gate, we will skip the old one */
361 if (targets->hci_reader_gate == 0x00)
362 targets->hci_reader_gate = gate;
363
364 r = nfc_targets_found(hdev->ndev, targets, 1);
365
366 exit:
367 kfree(targets);
368 kfree_skb(atqa_skb);
369 kfree_skb(sak_skb);
370 kfree_skb(uid_skb);
371
372 return r;
373 }
374 EXPORT_SYMBOL(nfc_hci_target_discovered);
375
376 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
377 struct sk_buff *skb)
378 {
379 int r = 0;
380 u8 gate = hdev->pipes[pipe].gate;
381
382 if (gate == NFC_HCI_INVALID_GATE) {
383 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
384 goto exit;
385 }
386
387 if (hdev->ops->event_received) {
388 r = hdev->ops->event_received(hdev, pipe, event, skb);
389 if (r <= 0)
390 goto exit_noskb;
391 }
392
393 switch (event) {
394 case NFC_HCI_EVT_TARGET_DISCOVERED:
395 if (skb->len < 1) { /* no status data? */
396 r = -EPROTO;
397 goto exit;
398 }
399
400 if (skb->data[0] == 3) {
401 /* TODO: Multiple targets in field, none activated
402 * poll is supposedly stopped, but there is no
403 * single target to activate, so nothing to report
404 * up.
405 * if we need to restart poll, we must save the
406 * protocols from the initial poll and reuse here.
407 */
408 }
409
410 if (skb->data[0] != 0) {
411 r = -EPROTO;
412 goto exit;
413 }
414
415 r = nfc_hci_target_discovered(hdev, gate);
416 break;
417 default:
418 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
419 r = -EINVAL;
420 break;
421 }
422
423 exit:
424 kfree_skb(skb);
425
426 exit_noskb:
427 if (r)
428 nfc_hci_driver_failure(hdev, r);
429 }
430
431 static void nfc_hci_cmd_timeout(unsigned long data)
432 {
433 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
434
435 schedule_work(&hdev->msg_tx_work);
436 }
437
438 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
439 struct nfc_hci_gate *gates)
440 {
441 int r;
442 while (gate_count--) {
443 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
444 gates->gate, gates->pipe);
445 if (r < 0)
446 return r;
447 gates++;
448 }
449
450 return 0;
451 }
452
453 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
454 {
455 struct sk_buff *skb = NULL;
456 int r;
457
458 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
459 return -EPROTO;
460
461 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
462 hdev->init_data.gates[0].gate,
463 hdev->init_data.gates[0].pipe);
464 if (r < 0)
465 goto exit;
466
467 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
468 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
469 if (r < 0)
470 goto disconnect_all;
471
472 if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
473 (memcmp(hdev->init_data.session_id, skb->data,
474 skb->len) == 0) && hdev->ops->load_session) {
475 /* Restore gate<->pipe table from some proprietary location. */
476
477 r = hdev->ops->load_session(hdev);
478
479 if (r < 0)
480 goto disconnect_all;
481 } else {
482
483 r = nfc_hci_disconnect_all_gates(hdev);
484 if (r < 0)
485 goto exit;
486
487 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
488 hdev->init_data.gates);
489 if (r < 0)
490 goto disconnect_all;
491
492 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
493 NFC_HCI_ADMIN_SESSION_IDENTITY,
494 hdev->init_data.session_id,
495 strlen(hdev->init_data.session_id));
496 }
497 if (r == 0)
498 goto exit;
499
500 disconnect_all:
501 nfc_hci_disconnect_all_gates(hdev);
502
503 exit:
504 kfree_skb(skb);
505
506 return r;
507 }
508
509 static int hci_dev_version(struct nfc_hci_dev *hdev)
510 {
511 int r;
512 struct sk_buff *skb;
513
514 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
515 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
516 if (r == -EOPNOTSUPP) {
517 pr_info("Software/Hardware info not available\n");
518 return 0;
519 }
520 if (r < 0)
521 return r;
522
523 if (skb->len != 3) {
524 kfree_skb(skb);
525 return -EINVAL;
526 }
527
528 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
529 hdev->sw_patch = skb->data[0] & 0x0f;
530 hdev->sw_flashlib_major = skb->data[1];
531 hdev->sw_flashlib_minor = skb->data[2];
532
533 kfree_skb(skb);
534
535 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
536 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
537 if (r < 0)
538 return r;
539
540 if (skb->len != 3) {
541 kfree_skb(skb);
542 return -EINVAL;
543 }
544
545 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
546 hdev->hw_version = skb->data[0] & 0x1f;
547 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
548 hdev->hw_software = skb->data[1] & 0x3f;
549 hdev->hw_bsid = skb->data[2];
550
551 kfree_skb(skb);
552
553 pr_info("SOFTWARE INFO:\n");
554 pr_info("RomLib : %d\n", hdev->sw_romlib);
555 pr_info("Patch : %d\n", hdev->sw_patch);
556 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
557 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
558 pr_info("HARDWARE INFO:\n");
559 pr_info("Derivative : %d\n", hdev->hw_derivative);
560 pr_info("HW Version : %d\n", hdev->hw_version);
561 pr_info("#MPW : %d\n", hdev->hw_mpw);
562 pr_info("Software : %d\n", hdev->hw_software);
563 pr_info("BSID Version : %d\n", hdev->hw_bsid);
564
565 return 0;
566 }
567
568 static int hci_dev_up(struct nfc_dev *nfc_dev)
569 {
570 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
571 int r = 0;
572
573 if (hdev->ops->open) {
574 r = hdev->ops->open(hdev);
575 if (r < 0)
576 return r;
577 }
578
579 r = nfc_llc_start(hdev->llc);
580 if (r < 0)
581 goto exit_close;
582
583 r = hci_dev_session_init(hdev);
584 if (r < 0)
585 goto exit_llc;
586
587 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
588 NFC_HCI_EVT_END_OPERATION, NULL, 0);
589 if (r < 0)
590 goto exit_llc;
591
592 if (hdev->ops->hci_ready) {
593 r = hdev->ops->hci_ready(hdev);
594 if (r < 0)
595 goto exit_llc;
596 }
597
598 r = hci_dev_version(hdev);
599 if (r < 0)
600 goto exit_llc;
601
602 return 0;
603
604 exit_llc:
605 nfc_llc_stop(hdev->llc);
606
607 exit_close:
608 if (hdev->ops->close)
609 hdev->ops->close(hdev);
610
611 return r;
612 }
613
614 static int hci_dev_down(struct nfc_dev *nfc_dev)
615 {
616 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
617
618 nfc_llc_stop(hdev->llc);
619
620 if (hdev->ops->close)
621 hdev->ops->close(hdev);
622
623 nfc_hci_reset_pipes(hdev);
624
625 return 0;
626 }
627
628 static int hci_start_poll(struct nfc_dev *nfc_dev,
629 u32 im_protocols, u32 tm_protocols)
630 {
631 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
632
633 if (hdev->ops->start_poll)
634 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
635 else
636 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
637 NFC_HCI_EVT_READER_REQUESTED,
638 NULL, 0);
639 }
640
641 static void hci_stop_poll(struct nfc_dev *nfc_dev)
642 {
643 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
644
645 if (hdev->ops->stop_poll)
646 hdev->ops->stop_poll(hdev);
647 else
648 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
649 NFC_HCI_EVT_END_OPERATION, NULL, 0);
650 }
651
652 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
653 __u8 comm_mode, __u8 *gb, size_t gb_len)
654 {
655 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
656
657 if (!hdev->ops->dep_link_up)
658 return 0;
659
660 return hdev->ops->dep_link_up(hdev, target, comm_mode,
661 gb, gb_len);
662 }
663
664 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
665 {
666 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
667
668 if (!hdev->ops->dep_link_down)
669 return 0;
670
671 return hdev->ops->dep_link_down(hdev);
672 }
673
674 static int hci_activate_target(struct nfc_dev *nfc_dev,
675 struct nfc_target *target, u32 protocol)
676 {
677 return 0;
678 }
679
680 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
681 struct nfc_target *target)
682 {
683 }
684
685 #define HCI_CB_TYPE_TRANSCEIVE 1
686
687 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
688 {
689 struct nfc_hci_dev *hdev = context;
690
691 switch (hdev->async_cb_type) {
692 case HCI_CB_TYPE_TRANSCEIVE:
693 /*
694 * TODO: Check RF Error indicator to make sure data is valid.
695 * It seems that HCI cmd can complete without error, but data
696 * can be invalid if an RF error occured? Ignore for now.
697 */
698 if (err == 0)
699 skb_trim(skb, skb->len - 1); /* RF Err ind */
700
701 hdev->async_cb(hdev->async_cb_context, skb, err);
702 break;
703 default:
704 if (err == 0)
705 kfree_skb(skb);
706 break;
707 }
708 }
709
710 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
711 struct sk_buff *skb, data_exchange_cb_t cb,
712 void *cb_context)
713 {
714 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
715 int r;
716
717 pr_debug("target_idx=%d\n", target->idx);
718
719 switch (target->hci_reader_gate) {
720 case NFC_HCI_RF_READER_A_GATE:
721 case NFC_HCI_RF_READER_B_GATE:
722 if (hdev->ops->im_transceive) {
723 r = hdev->ops->im_transceive(hdev, target, skb, cb,
724 cb_context);
725 if (r <= 0) /* handled */
726 break;
727 }
728
729 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
730
731 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
732 hdev->async_cb = cb;
733 hdev->async_cb_context = cb_context;
734
735 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
736 NFC_HCI_WR_XCHG_DATA, skb->data,
737 skb->len, hci_transceive_cb, hdev);
738 break;
739 default:
740 if (hdev->ops->im_transceive) {
741 r = hdev->ops->im_transceive(hdev, target, skb, cb,
742 cb_context);
743 if (r == 1)
744 r = -ENOTSUPP;
745 } else {
746 r = -ENOTSUPP;
747 }
748 break;
749 }
750
751 kfree_skb(skb);
752
753 return r;
754 }
755
756 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
757 {
758 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
759
760 if (!hdev->ops->tm_send) {
761 kfree_skb(skb);
762 return -ENOTSUPP;
763 }
764
765 return hdev->ops->tm_send(hdev, skb);
766 }
767
768 static int hci_check_presence(struct nfc_dev *nfc_dev,
769 struct nfc_target *target)
770 {
771 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
772
773 if (!hdev->ops->check_presence)
774 return 0;
775
776 return hdev->ops->check_presence(hdev, target);
777 }
778
779 static int hci_discover_se(struct nfc_dev *nfc_dev)
780 {
781 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
782
783 if (hdev->ops->discover_se)
784 return hdev->ops->discover_se(hdev);
785
786 return 0;
787 }
788
789 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
790 {
791 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
792
793 if (hdev->ops->enable_se)
794 return hdev->ops->enable_se(hdev, se_idx);
795
796 return 0;
797 }
798
799 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
800 {
801 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
802
803 if (hdev->ops->disable_se)
804 return hdev->ops->disable_se(hdev, se_idx);
805
806 return 0;
807 }
808
809 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
810 u8 *apdu, size_t apdu_length,
811 se_io_cb_t cb, void *cb_context)
812 {
813 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
814
815 if (hdev->ops->se_io)
816 return hdev->ops->se_io(hdev, se_idx, apdu,
817 apdu_length, cb, cb_context);
818
819 return 0;
820 }
821
822 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
823 {
824 mutex_lock(&hdev->msg_tx_mutex);
825
826 if (hdev->cmd_pending_msg == NULL) {
827 nfc_driver_failure(hdev->ndev, err);
828 goto exit;
829 }
830
831 __nfc_hci_cmd_completion(hdev, err, NULL);
832
833 exit:
834 mutex_unlock(&hdev->msg_tx_mutex);
835 }
836
837 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
838 {
839 nfc_hci_failure(hdev, err);
840 }
841
842 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
843 {
844 struct hcp_packet *packet;
845 u8 type;
846 u8 instruction;
847 struct sk_buff *hcp_skb;
848 u8 pipe;
849 struct sk_buff *frag_skb;
850 int msg_len;
851
852 packet = (struct hcp_packet *)skb->data;
853 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
854 skb_queue_tail(&hdev->rx_hcp_frags, skb);
855 return;
856 }
857
858 /* it's the last fragment. Does it need re-aggregation? */
859 if (skb_queue_len(&hdev->rx_hcp_frags)) {
860 pipe = packet->header & NFC_HCI_FRAGMENT;
861 skb_queue_tail(&hdev->rx_hcp_frags, skb);
862
863 msg_len = 0;
864 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
865 msg_len += (frag_skb->len -
866 NFC_HCI_HCP_PACKET_HEADER_LEN);
867 }
868
869 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
870 msg_len, GFP_KERNEL);
871 if (hcp_skb == NULL) {
872 nfc_hci_failure(hdev, -ENOMEM);
873 return;
874 }
875
876 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
877
878 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
879 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
880 memcpy(skb_put(hcp_skb, msg_len),
881 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
882 msg_len);
883 }
884
885 skb_queue_purge(&hdev->rx_hcp_frags);
886 } else {
887 packet->header &= NFC_HCI_FRAGMENT;
888 hcp_skb = skb;
889 }
890
891 /* if this is a response, dispatch immediately to
892 * unblock waiting cmd context. Otherwise, enqueue to dispatch
893 * in separate context where handler can also execute command.
894 */
895 packet = (struct hcp_packet *)hcp_skb->data;
896 type = HCP_MSG_GET_TYPE(packet->message.header);
897 if (type == NFC_HCI_HCP_RESPONSE) {
898 pipe = packet->header;
899 instruction = HCP_MSG_GET_CMD(packet->message.header);
900 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
901 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
902 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
903 } else {
904 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
905 schedule_work(&hdev->msg_rx_work);
906 }
907 }
908
909 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
910 {
911 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
912
913 if (!hdev->ops->fw_download)
914 return -ENOTSUPP;
915
916 return hdev->ops->fw_download(hdev, firmware_name);
917 }
918
919 static struct nfc_ops hci_nfc_ops = {
920 .dev_up = hci_dev_up,
921 .dev_down = hci_dev_down,
922 .start_poll = hci_start_poll,
923 .stop_poll = hci_stop_poll,
924 .dep_link_up = hci_dep_link_up,
925 .dep_link_down = hci_dep_link_down,
926 .activate_target = hci_activate_target,
927 .deactivate_target = hci_deactivate_target,
928 .im_transceive = hci_transceive,
929 .tm_send = hci_tm_send,
930 .check_presence = hci_check_presence,
931 .fw_download = hci_fw_download,
932 .discover_se = hci_discover_se,
933 .enable_se = hci_enable_se,
934 .disable_se = hci_disable_se,
935 .se_io = hci_se_io,
936 };
937
938 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
939 struct nfc_hci_init_data *init_data,
940 unsigned long quirks,
941 u32 protocols,
942 const char *llc_name,
943 int tx_headroom,
944 int tx_tailroom,
945 int max_link_payload)
946 {
947 struct nfc_hci_dev *hdev;
948
949 if (ops->xmit == NULL)
950 return NULL;
951
952 if (protocols == 0)
953 return NULL;
954
955 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
956 if (hdev == NULL)
957 return NULL;
958
959 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
960 nfc_hci_recv_from_llc, tx_headroom,
961 tx_tailroom, nfc_hci_llc_failure);
962 if (hdev->llc == NULL) {
963 kfree(hdev);
964 return NULL;
965 }
966
967 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
968 tx_headroom + HCI_CMDS_HEADROOM,
969 tx_tailroom);
970 if (!hdev->ndev) {
971 nfc_llc_free(hdev->llc);
972 kfree(hdev);
973 return NULL;
974 }
975
976 hdev->ops = ops;
977 hdev->max_data_link_payload = max_link_payload;
978 hdev->init_data = *init_data;
979
980 nfc_set_drvdata(hdev->ndev, hdev);
981
982 nfc_hci_reset_pipes(hdev);
983
984 hdev->quirks = quirks;
985
986 return hdev;
987 }
988 EXPORT_SYMBOL(nfc_hci_allocate_device);
989
990 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
991 {
992 nfc_free_device(hdev->ndev);
993 nfc_llc_free(hdev->llc);
994 kfree(hdev);
995 }
996 EXPORT_SYMBOL(nfc_hci_free_device);
997
998 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
999 {
1000 mutex_init(&hdev->msg_tx_mutex);
1001
1002 INIT_LIST_HEAD(&hdev->msg_tx_queue);
1003
1004 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1005
1006 init_timer(&hdev->cmd_timer);
1007 hdev->cmd_timer.data = (unsigned long)hdev;
1008 hdev->cmd_timer.function = nfc_hci_cmd_timeout;
1009
1010 skb_queue_head_init(&hdev->rx_hcp_frags);
1011
1012 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1013
1014 skb_queue_head_init(&hdev->msg_rx_queue);
1015
1016 return nfc_register_device(hdev->ndev);
1017 }
1018 EXPORT_SYMBOL(nfc_hci_register_device);
1019
1020 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1021 {
1022 struct hci_msg *msg, *n;
1023
1024 mutex_lock(&hdev->msg_tx_mutex);
1025
1026 if (hdev->cmd_pending_msg) {
1027 if (hdev->cmd_pending_msg->cb)
1028 hdev->cmd_pending_msg->cb(
1029 hdev->cmd_pending_msg->cb_context,
1030 NULL, -ESHUTDOWN);
1031 kfree(hdev->cmd_pending_msg);
1032 hdev->cmd_pending_msg = NULL;
1033 }
1034
1035 hdev->shutting_down = true;
1036
1037 mutex_unlock(&hdev->msg_tx_mutex);
1038
1039 del_timer_sync(&hdev->cmd_timer);
1040 cancel_work_sync(&hdev->msg_tx_work);
1041
1042 cancel_work_sync(&hdev->msg_rx_work);
1043
1044 nfc_unregister_device(hdev->ndev);
1045
1046 skb_queue_purge(&hdev->rx_hcp_frags);
1047 skb_queue_purge(&hdev->msg_rx_queue);
1048
1049 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1050 list_del(&msg->msg_l);
1051 skb_queue_purge(&msg->msg_frags);
1052 kfree(msg);
1053 }
1054 }
1055 EXPORT_SYMBOL(nfc_hci_unregister_device);
1056
1057 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1058 {
1059 hdev->clientdata = clientdata;
1060 }
1061 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1062
1063 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1064 {
1065 return hdev->clientdata;
1066 }
1067 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1068
1069 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1070 {
1071 nfc_hci_failure(hdev, err);
1072 }
1073 EXPORT_SYMBOL(nfc_hci_driver_failure);
1074
1075 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1076 {
1077 nfc_llc_rcv_from_drv(hdev->llc, skb);
1078 }
1079 EXPORT_SYMBOL(nfc_hci_recv_frame);
1080
1081 static int __init nfc_hci_init(void)
1082 {
1083 return nfc_llc_init();
1084 }
1085
1086 static void __exit nfc_hci_exit(void)
1087 {
1088 nfc_llc_exit();
1089 }
1090
1091 subsys_initcall(nfc_hci_init);
1092 module_exit(nfc_hci_exit);
1093
1094 MODULE_LICENSE("GPL");
1095 MODULE_DESCRIPTION("NFC HCI Core");
Linux kernel - Deliverables
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