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