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Linux 4.19-rc7
[linux-2.6/btrfs-unstable.git] / net / nfc / hci / core.c
blob19cb2e473ea607af8caa56848c9976baaf88acf4
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 if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
213 status = NFC_HCI_ANY_E_NOK;
214 goto exit;
215 }
216
217 /* Save the new created pipe and bind with local gate,
218 * the description for skb->data[3] is destination gate id
219 * but since we received this cmd from host controller, we
220 * are the destination and it is our local gate
221 */
222 hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
223 hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
224 hdev->pipes[create_info->pipe].dest_host =
225 create_info->src_host;
226 break;
227 case NFC_HCI_ANY_OPEN_PIPE:
228 if (gate == NFC_HCI_INVALID_GATE) {
229 status = NFC_HCI_ANY_E_NOK;
230 goto exit;
231 }
232 break;
233 case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
234 if (skb->len != 1) {
235 status = NFC_HCI_ANY_E_NOK;
236 goto exit;
237 }
238 delete_info = (struct hci_delete_pipe_noti *)skb->data;
239
240 if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
241 status = NFC_HCI_ANY_E_NOK;
242 goto exit;
243 }
244
245 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
246 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
247 break;
248 case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
249 if (skb->len != 1) {
250 status = NFC_HCI_ANY_E_NOK;
251 goto exit;
252 }
253 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
254
255 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
256 break;
257 default:
258 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
259 break;
260 }
261
262 if (hdev->ops->cmd_received)
263 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
264
265 exit:
266 nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
267 status, NULL, 0, NULL, NULL, 0);
268
269 kfree_skb(skb);
270 }
271
272 u32 nfc_hci_sak_to_protocol(u8 sak)
273 {
274 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
275 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
276 return NFC_PROTO_MIFARE_MASK;
277 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
278 return NFC_PROTO_ISO14443_MASK;
279 case NFC_HCI_TYPE_A_SEL_PROT_DEP:
280 return NFC_PROTO_NFC_DEP_MASK;
281 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
282 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
283 default:
284 return 0xffffffff;
285 }
286 }
287 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
288
289 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
290 {
291 struct nfc_target *targets;
292 struct sk_buff *atqa_skb = NULL;
293 struct sk_buff *sak_skb = NULL;
294 struct sk_buff *uid_skb = NULL;
295 int r;
296
297 pr_debug("from gate %d\n", gate);
298
299 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
300 if (targets == NULL)
301 return -ENOMEM;
302
303 switch (gate) {
304 case NFC_HCI_RF_READER_A_GATE:
305 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
306 NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
307 if (r < 0)
308 goto exit;
309
310 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
311 NFC_HCI_RF_READER_A_SAK, &sak_skb);
312 if (r < 0)
313 goto exit;
314
315 if (atqa_skb->len != 2 || sak_skb->len != 1) {
316 r = -EPROTO;
317 goto exit;
318 }
319
320 targets->supported_protocols =
321 nfc_hci_sak_to_protocol(sak_skb->data[0]);
322 if (targets->supported_protocols == 0xffffffff) {
323 r = -EPROTO;
324 goto exit;
325 }
326
327 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
328 targets->sel_res = sak_skb->data[0];
329
330 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
331 NFC_HCI_RF_READER_A_UID, &uid_skb);
332 if (r < 0)
333 goto exit;
334
335 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
336 r = -EPROTO;
337 goto exit;
338 }
339
340 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
341 targets->nfcid1_len = uid_skb->len;
342
343 if (hdev->ops->complete_target_discovered) {
344 r = hdev->ops->complete_target_discovered(hdev, gate,
345 targets);
346 if (r < 0)
347 goto exit;
348 }
349 break;
350 case NFC_HCI_RF_READER_B_GATE:
351 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
352 break;
353 default:
354 if (hdev->ops->target_from_gate)
355 r = hdev->ops->target_from_gate(hdev, gate, targets);
356 else
357 r = -EPROTO;
358 if (r < 0)
359 goto exit;
360
361 if (hdev->ops->complete_target_discovered) {
362 r = hdev->ops->complete_target_discovered(hdev, gate,
363 targets);
364 if (r < 0)
365 goto exit;
366 }
367 break;
368 }
369
370 /* if driver set the new gate, we will skip the old one */
371 if (targets->hci_reader_gate == 0x00)
372 targets->hci_reader_gate = gate;
373
374 r = nfc_targets_found(hdev->ndev, targets, 1);
375
376 exit:
377 kfree(targets);
378 kfree_skb(atqa_skb);
379 kfree_skb(sak_skb);
380 kfree_skb(uid_skb);
381
382 return r;
383 }
384 EXPORT_SYMBOL(nfc_hci_target_discovered);
385
386 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
387 struct sk_buff *skb)
388 {
389 int r = 0;
390 u8 gate = hdev->pipes[pipe].gate;
391
392 if (gate == NFC_HCI_INVALID_GATE) {
393 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
394 goto exit;
395 }
396
397 if (hdev->ops->event_received) {
398 r = hdev->ops->event_received(hdev, pipe, event, skb);
399 if (r <= 0)
400 goto exit_noskb;
401 }
402
403 switch (event) {
404 case NFC_HCI_EVT_TARGET_DISCOVERED:
405 if (skb->len < 1) { /* no status data? */
406 r = -EPROTO;
407 goto exit;
408 }
409
410 if (skb->data[0] == 3) {
411 /* TODO: Multiple targets in field, none activated
412 * poll is supposedly stopped, but there is no
413 * single target to activate, so nothing to report
414 * up.
415 * if we need to restart poll, we must save the
416 * protocols from the initial poll and reuse here.
417 */
418 }
419
420 if (skb->data[0] != 0) {
421 r = -EPROTO;
422 goto exit;
423 }
424
425 r = nfc_hci_target_discovered(hdev, gate);
426 break;
427 default:
428 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
429 r = -EINVAL;
430 break;
431 }
432
433 exit:
434 kfree_skb(skb);
435
436 exit_noskb:
437 if (r)
438 nfc_hci_driver_failure(hdev, r);
439 }
440
441 static void nfc_hci_cmd_timeout(struct timer_list *t)
442 {
443 struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
444
445 schedule_work(&hdev->msg_tx_work);
446 }
447
448 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
449 struct nfc_hci_gate *gates)
450 {
451 int r;
452 while (gate_count--) {
453 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
454 gates->gate, gates->pipe);
455 if (r < 0)
456 return r;
457 gates++;
458 }
459
460 return 0;
461 }
462
463 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
464 {
465 struct sk_buff *skb = NULL;
466 int r;
467
468 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
469 return -EPROTO;
470
471 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
472 hdev->init_data.gates[0].gate,
473 hdev->init_data.gates[0].pipe);
474 if (r < 0)
475 goto exit;
476
477 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
478 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
479 if (r < 0)
480 goto disconnect_all;
481
482 if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
483 (memcmp(hdev->init_data.session_id, skb->data,
484 skb->len) == 0) && hdev->ops->load_session) {
485 /* Restore gate<->pipe table from some proprietary location. */
486
487 r = hdev->ops->load_session(hdev);
488
489 if (r < 0)
490 goto disconnect_all;
491 } else {
492
493 r = nfc_hci_disconnect_all_gates(hdev);
494 if (r < 0)
495 goto exit;
496
497 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
498 hdev->init_data.gates);
499 if (r < 0)
500 goto disconnect_all;
501
502 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
503 NFC_HCI_ADMIN_SESSION_IDENTITY,
504 hdev->init_data.session_id,
505 strlen(hdev->init_data.session_id));
506 }
507 if (r == 0)
508 goto exit;
509
510 disconnect_all:
511 nfc_hci_disconnect_all_gates(hdev);
512
513 exit:
514 kfree_skb(skb);
515
516 return r;
517 }
518
519 static int hci_dev_version(struct nfc_hci_dev *hdev)
520 {
521 int r;
522 struct sk_buff *skb;
523
524 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
525 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
526 if (r == -EOPNOTSUPP) {
527 pr_info("Software/Hardware info not available\n");
528 return 0;
529 }
530 if (r < 0)
531 return r;
532
533 if (skb->len != 3) {
534 kfree_skb(skb);
535 return -EINVAL;
536 }
537
538 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
539 hdev->sw_patch = skb->data[0] & 0x0f;
540 hdev->sw_flashlib_major = skb->data[1];
541 hdev->sw_flashlib_minor = skb->data[2];
542
543 kfree_skb(skb);
544
545 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
546 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
547 if (r < 0)
548 return r;
549
550 if (skb->len != 3) {
551 kfree_skb(skb);
552 return -EINVAL;
553 }
554
555 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
556 hdev->hw_version = skb->data[0] & 0x1f;
557 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
558 hdev->hw_software = skb->data[1] & 0x3f;
559 hdev->hw_bsid = skb->data[2];
560
561 kfree_skb(skb);
562
563 pr_info("SOFTWARE INFO:\n");
564 pr_info("RomLib : %d\n", hdev->sw_romlib);
565 pr_info("Patch : %d\n", hdev->sw_patch);
566 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
567 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
568 pr_info("HARDWARE INFO:\n");
569 pr_info("Derivative : %d\n", hdev->hw_derivative);
570 pr_info("HW Version : %d\n", hdev->hw_version);
571 pr_info("#MPW : %d\n", hdev->hw_mpw);
572 pr_info("Software : %d\n", hdev->hw_software);
573 pr_info("BSID Version : %d\n", hdev->hw_bsid);
574
575 return 0;
576 }
577
578 static int hci_dev_up(struct nfc_dev *nfc_dev)
579 {
580 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
581 int r = 0;
582
583 if (hdev->ops->open) {
584 r = hdev->ops->open(hdev);
585 if (r < 0)
586 return r;
587 }
588
589 r = nfc_llc_start(hdev->llc);
590 if (r < 0)
591 goto exit_close;
592
593 r = hci_dev_session_init(hdev);
594 if (r < 0)
595 goto exit_llc;
596
597 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
598 NFC_HCI_EVT_END_OPERATION, NULL, 0);
599 if (r < 0)
600 goto exit_llc;
601
602 if (hdev->ops->hci_ready) {
603 r = hdev->ops->hci_ready(hdev);
604 if (r < 0)
605 goto exit_llc;
606 }
607
608 r = hci_dev_version(hdev);
609 if (r < 0)
610 goto exit_llc;
611
612 return 0;
613
614 exit_llc:
615 nfc_llc_stop(hdev->llc);
616
617 exit_close:
618 if (hdev->ops->close)
619 hdev->ops->close(hdev);
620
621 return r;
622 }
623
624 static int hci_dev_down(struct nfc_dev *nfc_dev)
625 {
626 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
627
628 nfc_llc_stop(hdev->llc);
629
630 if (hdev->ops->close)
631 hdev->ops->close(hdev);
632
633 nfc_hci_reset_pipes(hdev);
634
635 return 0;
636 }
637
638 static int hci_start_poll(struct nfc_dev *nfc_dev,
639 u32 im_protocols, u32 tm_protocols)
640 {
641 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
642
643 if (hdev->ops->start_poll)
644 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
645 else
646 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
647 NFC_HCI_EVT_READER_REQUESTED,
648 NULL, 0);
649 }
650
651 static void hci_stop_poll(struct nfc_dev *nfc_dev)
652 {
653 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
654
655 if (hdev->ops->stop_poll)
656 hdev->ops->stop_poll(hdev);
657 else
658 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
659 NFC_HCI_EVT_END_OPERATION, NULL, 0);
660 }
661
662 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
663 __u8 comm_mode, __u8 *gb, size_t gb_len)
664 {
665 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
666
667 if (!hdev->ops->dep_link_up)
668 return 0;
669
670 return hdev->ops->dep_link_up(hdev, target, comm_mode,
671 gb, gb_len);
672 }
673
674 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
675 {
676 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
677
678 if (!hdev->ops->dep_link_down)
679 return 0;
680
681 return hdev->ops->dep_link_down(hdev);
682 }
683
684 static int hci_activate_target(struct nfc_dev *nfc_dev,
685 struct nfc_target *target, u32 protocol)
686 {
687 return 0;
688 }
689
690 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
691 struct nfc_target *target,
692 u8 mode)
693 {
694 }
695
696 #define HCI_CB_TYPE_TRANSCEIVE 1
697
698 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
699 {
700 struct nfc_hci_dev *hdev = context;
701
702 switch (hdev->async_cb_type) {
703 case HCI_CB_TYPE_TRANSCEIVE:
704 /*
705 * TODO: Check RF Error indicator to make sure data is valid.
706 * It seems that HCI cmd can complete without error, but data
707 * can be invalid if an RF error occured? Ignore for now.
708 */
709 if (err == 0)
710 skb_trim(skb, skb->len - 1); /* RF Err ind */
711
712 hdev->async_cb(hdev->async_cb_context, skb, err);
713 break;
714 default:
715 if (err == 0)
716 kfree_skb(skb);
717 break;
718 }
719 }
720
721 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
722 struct sk_buff *skb, data_exchange_cb_t cb,
723 void *cb_context)
724 {
725 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
726 int r;
727
728 pr_debug("target_idx=%d\n", target->idx);
729
730 switch (target->hci_reader_gate) {
731 case NFC_HCI_RF_READER_A_GATE:
732 case NFC_HCI_RF_READER_B_GATE:
733 if (hdev->ops->im_transceive) {
734 r = hdev->ops->im_transceive(hdev, target, skb, cb,
735 cb_context);
736 if (r <= 0) /* handled */
737 break;
738 }
739
740 *(u8 *)skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
741
742 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
743 hdev->async_cb = cb;
744 hdev->async_cb_context = cb_context;
745
746 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
747 NFC_HCI_WR_XCHG_DATA, skb->data,
748 skb->len, hci_transceive_cb, hdev);
749 break;
750 default:
751 if (hdev->ops->im_transceive) {
752 r = hdev->ops->im_transceive(hdev, target, skb, cb,
753 cb_context);
754 if (r == 1)
755 r = -ENOTSUPP;
756 } else {
757 r = -ENOTSUPP;
758 }
759 break;
760 }
761
762 kfree_skb(skb);
763
764 return r;
765 }
766
767 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
768 {
769 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
770
771 if (!hdev->ops->tm_send) {
772 kfree_skb(skb);
773 return -ENOTSUPP;
774 }
775
776 return hdev->ops->tm_send(hdev, skb);
777 }
778
779 static int hci_check_presence(struct nfc_dev *nfc_dev,
780 struct nfc_target *target)
781 {
782 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
783
784 if (!hdev->ops->check_presence)
785 return 0;
786
787 return hdev->ops->check_presence(hdev, target);
788 }
789
790 static int hci_discover_se(struct nfc_dev *nfc_dev)
791 {
792 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
793
794 if (hdev->ops->discover_se)
795 return hdev->ops->discover_se(hdev);
796
797 return 0;
798 }
799
800 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
801 {
802 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
803
804 if (hdev->ops->enable_se)
805 return hdev->ops->enable_se(hdev, se_idx);
806
807 return 0;
808 }
809
810 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
811 {
812 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
813
814 if (hdev->ops->disable_se)
815 return hdev->ops->disable_se(hdev, se_idx);
816
817 return 0;
818 }
819
820 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
821 u8 *apdu, size_t apdu_length,
822 se_io_cb_t cb, void *cb_context)
823 {
824 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
825
826 if (hdev->ops->se_io)
827 return hdev->ops->se_io(hdev, se_idx, apdu,
828 apdu_length, cb, cb_context);
829
830 return 0;
831 }
832
833 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
834 {
835 mutex_lock(&hdev->msg_tx_mutex);
836
837 if (hdev->cmd_pending_msg == NULL) {
838 nfc_driver_failure(hdev->ndev, err);
839 goto exit;
840 }
841
842 __nfc_hci_cmd_completion(hdev, err, NULL);
843
844 exit:
845 mutex_unlock(&hdev->msg_tx_mutex);
846 }
847
848 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
849 {
850 nfc_hci_failure(hdev, err);
851 }
852
853 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
854 {
855 struct hcp_packet *packet;
856 u8 type;
857 u8 instruction;
858 struct sk_buff *hcp_skb;
859 u8 pipe;
860 struct sk_buff *frag_skb;
861 int msg_len;
862
863 packet = (struct hcp_packet *)skb->data;
864 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
865 skb_queue_tail(&hdev->rx_hcp_frags, skb);
866 return;
867 }
868
869 /* it's the last fragment. Does it need re-aggregation? */
870 if (skb_queue_len(&hdev->rx_hcp_frags)) {
871 pipe = packet->header & NFC_HCI_FRAGMENT;
872 skb_queue_tail(&hdev->rx_hcp_frags, skb);
873
874 msg_len = 0;
875 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
876 msg_len += (frag_skb->len -
877 NFC_HCI_HCP_PACKET_HEADER_LEN);
878 }
879
880 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
881 msg_len, GFP_KERNEL);
882 if (hcp_skb == NULL) {
883 nfc_hci_failure(hdev, -ENOMEM);
884 return;
885 }
886
887 skb_put_u8(hcp_skb, pipe);
888
889 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
890 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
891 skb_put_data(hcp_skb,
892 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
893 msg_len);
894 }
895
896 skb_queue_purge(&hdev->rx_hcp_frags);
897 } else {
898 packet->header &= NFC_HCI_FRAGMENT;
899 hcp_skb = skb;
900 }
901
902 /* if this is a response, dispatch immediately to
903 * unblock waiting cmd context. Otherwise, enqueue to dispatch
904 * in separate context where handler can also execute command.
905 */
906 packet = (struct hcp_packet *)hcp_skb->data;
907 type = HCP_MSG_GET_TYPE(packet->message.header);
908 if (type == NFC_HCI_HCP_RESPONSE) {
909 pipe = packet->header;
910 instruction = HCP_MSG_GET_CMD(packet->message.header);
911 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
912 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
913 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
914 } else {
915 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
916 schedule_work(&hdev->msg_rx_work);
917 }
918 }
919
920 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
921 {
922 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
923
924 if (!hdev->ops->fw_download)
925 return -ENOTSUPP;
926
927 return hdev->ops->fw_download(hdev, firmware_name);
928 }
929
930 static struct nfc_ops hci_nfc_ops = {
931 .dev_up = hci_dev_up,
932 .dev_down = hci_dev_down,
933 .start_poll = hci_start_poll,
934 .stop_poll = hci_stop_poll,
935 .dep_link_up = hci_dep_link_up,
936 .dep_link_down = hci_dep_link_down,
937 .activate_target = hci_activate_target,
938 .deactivate_target = hci_deactivate_target,
939 .im_transceive = hci_transceive,
940 .tm_send = hci_tm_send,
941 .check_presence = hci_check_presence,
942 .fw_download = hci_fw_download,
943 .discover_se = hci_discover_se,
944 .enable_se = hci_enable_se,
945 .disable_se = hci_disable_se,
946 .se_io = hci_se_io,
947 };
948
949 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
950 struct nfc_hci_init_data *init_data,
951 unsigned long quirks,
952 u32 protocols,
953 const char *llc_name,
954 int tx_headroom,
955 int tx_tailroom,
956 int max_link_payload)
957 {
958 struct nfc_hci_dev *hdev;
959
960 if (ops->xmit == NULL)
961 return NULL;
962
963 if (protocols == 0)
964 return NULL;
965
966 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
967 if (hdev == NULL)
968 return NULL;
969
970 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
971 nfc_hci_recv_from_llc, tx_headroom,
972 tx_tailroom, nfc_hci_llc_failure);
973 if (hdev->llc == NULL) {
974 kfree(hdev);
975 return NULL;
976 }
977
978 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
979 tx_headroom + HCI_CMDS_HEADROOM,
980 tx_tailroom);
981 if (!hdev->ndev) {
982 nfc_llc_free(hdev->llc);
983 kfree(hdev);
984 return NULL;
985 }
986
987 hdev->ops = ops;
988 hdev->max_data_link_payload = max_link_payload;
989 hdev->init_data = *init_data;
990
991 nfc_set_drvdata(hdev->ndev, hdev);
992
993 nfc_hci_reset_pipes(hdev);
994
995 hdev->quirks = quirks;
996
997 return hdev;
998 }
999 EXPORT_SYMBOL(nfc_hci_allocate_device);
1000
1001 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
1002 {
1003 nfc_free_device(hdev->ndev);
1004 nfc_llc_free(hdev->llc);
1005 kfree(hdev);
1006 }
1007 EXPORT_SYMBOL(nfc_hci_free_device);
1008
1009 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
1010 {
1011 mutex_init(&hdev->msg_tx_mutex);
1012
1013 INIT_LIST_HEAD(&hdev->msg_tx_queue);
1014
1015 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1016
1017 timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
1018
1019 skb_queue_head_init(&hdev->rx_hcp_frags);
1020
1021 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1022
1023 skb_queue_head_init(&hdev->msg_rx_queue);
1024
1025 return nfc_register_device(hdev->ndev);
1026 }
1027 EXPORT_SYMBOL(nfc_hci_register_device);
1028
1029 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1030 {
1031 struct hci_msg *msg, *n;
1032
1033 mutex_lock(&hdev->msg_tx_mutex);
1034
1035 if (hdev->cmd_pending_msg) {
1036 if (hdev->cmd_pending_msg->cb)
1037 hdev->cmd_pending_msg->cb(
1038 hdev->cmd_pending_msg->cb_context,
1039 NULL, -ESHUTDOWN);
1040 kfree(hdev->cmd_pending_msg);
1041 hdev->cmd_pending_msg = NULL;
1042 }
1043
1044 hdev->shutting_down = true;
1045
1046 mutex_unlock(&hdev->msg_tx_mutex);
1047
1048 del_timer_sync(&hdev->cmd_timer);
1049 cancel_work_sync(&hdev->msg_tx_work);
1050
1051 cancel_work_sync(&hdev->msg_rx_work);
1052
1053 nfc_unregister_device(hdev->ndev);
1054
1055 skb_queue_purge(&hdev->rx_hcp_frags);
1056 skb_queue_purge(&hdev->msg_rx_queue);
1057
1058 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1059 list_del(&msg->msg_l);
1060 skb_queue_purge(&msg->msg_frags);
1061 kfree(msg);
1062 }
1063 }
1064 EXPORT_SYMBOL(nfc_hci_unregister_device);
1065
1066 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1067 {
1068 hdev->clientdata = clientdata;
1069 }
1070 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1071
1072 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1073 {
1074 return hdev->clientdata;
1075 }
1076 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1077
1078 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1079 {
1080 nfc_hci_failure(hdev, err);
1081 }
1082 EXPORT_SYMBOL(nfc_hci_driver_failure);
1083
1084 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1085 {
1086 nfc_llc_rcv_from_drv(hdev->llc, skb);
1087 }
1088 EXPORT_SYMBOL(nfc_hci_recv_frame);
1089
1090 static int __init nfc_hci_init(void)
1091 {
1092 return nfc_llc_init();
1093 }
1094
1095 static void __exit nfc_hci_exit(void)
1096 {
1097 nfc_llc_exit();
1098 }
1099
1100 subsys_initcall(nfc_hci_init);
1101 module_exit(nfc_hci_exit);
1102
1103 MODULE_LICENSE("GPL");
1104 MODULE_DESCRIPTION("NFC HCI Core");
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