Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2012 Intel Corporation. All rights reserved.
4 */
5
6#define pr_fmt(fmt) "hci: %s: " fmt, __func__
7
8#include <linux/init.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/nfc.h>
12
13#include <net/nfc/nfc.h>
14#include <net/nfc/hci.h>
15#include <net/nfc/llc.h>
16
17#include "hci.h"
18
19/* Largest headroom needed for outgoing HCI commands */
20#define HCI_CMDS_HEADROOM 1
21
22int nfc_hci_result_to_errno(u8 result)
23{
24 switch (result) {
25 case NFC_HCI_ANY_OK:
26 return 0;
27 case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
28 return -EOPNOTSUPP;
29 case NFC_HCI_ANY_E_TIMEOUT:
30 return -ETIME;
31 default:
32 return -1;
33 }
34}
35EXPORT_SYMBOL(nfc_hci_result_to_errno);
36
37void nfc_hci_reset_pipes(struct nfc_hci_dev *hdev)
38{
39 int i = 0;
40
41 for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
42 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
43 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
44 }
45 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
46}
47EXPORT_SYMBOL(nfc_hci_reset_pipes);
48
49void nfc_hci_reset_pipes_per_host(struct nfc_hci_dev *hdev, u8 host)
50{
51 int i = 0;
52
53 for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
54 if (hdev->pipes[i].dest_host != host)
55 continue;
56
57 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
58 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
59 }
60}
61EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
62
63static void nfc_hci_msg_tx_work(struct work_struct *work)
64{
65 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
66 msg_tx_work);
67 struct hci_msg *msg;
68 struct sk_buff *skb;
69 int r = 0;
70
71 mutex_lock(&hdev->msg_tx_mutex);
72 if (hdev->shutting_down)
73 goto exit;
74
75 if (hdev->cmd_pending_msg) {
76 if (timer_pending(&hdev->cmd_timer) == 0) {
77 if (hdev->cmd_pending_msg->cb)
78 hdev->cmd_pending_msg->cb(hdev->
79 cmd_pending_msg->
80 cb_context,
81 NULL,
82 -ETIME);
83 kfree(hdev->cmd_pending_msg);
84 hdev->cmd_pending_msg = NULL;
85 } else {
86 goto exit;
87 }
88 }
89
90next_msg:
91 if (list_empty(&hdev->msg_tx_queue))
92 goto exit;
93
94 msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
95 list_del(&msg->msg_l);
96
97 pr_debug("msg_tx_queue has a cmd to send\n");
98 while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
99 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
100 if (r < 0) {
101 kfree_skb(skb);
102 skb_queue_purge(&msg->msg_frags);
103 if (msg->cb)
104 msg->cb(msg->cb_context, NULL, r);
105 kfree(msg);
106 break;
107 }
108 }
109
110 if (r)
111 goto next_msg;
112
113 if (msg->wait_response == false) {
114 kfree(msg);
115 goto next_msg;
116 }
117
118 hdev->cmd_pending_msg = msg;
119 mod_timer(&hdev->cmd_timer, jiffies +
120 msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
121
122exit:
123 mutex_unlock(&hdev->msg_tx_mutex);
124}
125
126static void nfc_hci_msg_rx_work(struct work_struct *work)
127{
128 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
129 msg_rx_work);
130 struct sk_buff *skb;
131 const struct hcp_message *message;
132 u8 pipe;
133 u8 type;
134 u8 instruction;
135
136 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
137 pipe = skb->data[0];
138 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
139 message = (struct hcp_message *)skb->data;
140 type = HCP_MSG_GET_TYPE(message->header);
141 instruction = HCP_MSG_GET_CMD(message->header);
142 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
143
144 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
145 }
146}
147
148static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
149 struct sk_buff *skb)
150{
151 del_timer_sync(&hdev->cmd_timer);
152
153 if (hdev->cmd_pending_msg->cb)
154 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
155 skb, err);
156 else
157 kfree_skb(skb);
158
159 kfree(hdev->cmd_pending_msg);
160 hdev->cmd_pending_msg = NULL;
161
162 schedule_work(&hdev->msg_tx_work);
163}
164
165void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
166 struct sk_buff *skb)
167{
168 mutex_lock(&hdev->msg_tx_mutex);
169
170 if (hdev->cmd_pending_msg == NULL) {
171 kfree_skb(skb);
172 goto exit;
173 }
174
175 __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
176
177exit:
178 mutex_unlock(&hdev->msg_tx_mutex);
179}
180
181void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
182 struct sk_buff *skb)
183{
184 u8 status = NFC_HCI_ANY_OK;
185 const struct hci_create_pipe_resp *create_info;
186 const struct hci_delete_pipe_noti *delete_info;
187 const struct hci_all_pipe_cleared_noti *cleared_info;
188 u8 gate;
189
190 pr_debug("from pipe %x cmd %x\n", pipe, cmd);
191
192 if (pipe >= NFC_HCI_MAX_PIPES) {
193 status = NFC_HCI_ANY_E_NOK;
194 goto exit;
195 }
196
197 gate = hdev->pipes[pipe].gate;
198
199 switch (cmd) {
200 case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
201 if (skb->len != 5) {
202 status = NFC_HCI_ANY_E_NOK;
203 goto exit;
204 }
205 create_info = (struct hci_create_pipe_resp *)skb->data;
206
207 if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
208 status = NFC_HCI_ANY_E_NOK;
209 goto exit;
210 }
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 if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
236 status = NFC_HCI_ANY_E_NOK;
237 goto exit;
238 }
239
240 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
241 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
242 break;
243 case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
244 if (skb->len != 1) {
245 status = NFC_HCI_ANY_E_NOK;
246 goto exit;
247 }
248 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
249
250 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
251 break;
252 default:
253 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
254 break;
255 }
256
257 if (hdev->ops->cmd_received)
258 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
259
260exit:
261 nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
262 status, NULL, 0, NULL, NULL, 0);
263
264 kfree_skb(skb);
265}
266
267u32 nfc_hci_sak_to_protocol(u8 sak)
268{
269 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
270 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
271 return NFC_PROTO_MIFARE_MASK;
272 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
273 return NFC_PROTO_ISO14443_MASK;
274 case NFC_HCI_TYPE_A_SEL_PROT_DEP:
275 return NFC_PROTO_NFC_DEP_MASK;
276 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
277 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
278 default:
279 return 0xffffffff;
280 }
281}
282EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
283
284int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
285{
286 struct nfc_target *targets;
287 struct sk_buff *atqa_skb = NULL;
288 struct sk_buff *sak_skb = NULL;
289 struct sk_buff *uid_skb = NULL;
290 int r;
291
292 pr_debug("from gate %d\n", gate);
293
294 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
295 if (targets == NULL)
296 return -ENOMEM;
297
298 switch (gate) {
299 case NFC_HCI_RF_READER_A_GATE:
300 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
301 NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
302 if (r < 0)
303 goto exit;
304
305 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
306 NFC_HCI_RF_READER_A_SAK, &sak_skb);
307 if (r < 0)
308 goto exit;
309
310 if (atqa_skb->len != 2 || sak_skb->len != 1) {
311 r = -EPROTO;
312 goto exit;
313 }
314
315 targets->supported_protocols =
316 nfc_hci_sak_to_protocol(sak_skb->data[0]);
317 if (targets->supported_protocols == 0xffffffff) {
318 r = -EPROTO;
319 goto exit;
320 }
321
322 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
323 targets->sel_res = sak_skb->data[0];
324
325 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
326 NFC_HCI_RF_READER_A_UID, &uid_skb);
327 if (r < 0)
328 goto exit;
329
330 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
331 r = -EPROTO;
332 goto exit;
333 }
334
335 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
336 targets->nfcid1_len = uid_skb->len;
337
338 if (hdev->ops->complete_target_discovered) {
339 r = hdev->ops->complete_target_discovered(hdev, gate,
340 targets);
341 if (r < 0)
342 goto exit;
343 }
344 break;
345 case NFC_HCI_RF_READER_B_GATE:
346 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
347 break;
348 default:
349 if (hdev->ops->target_from_gate)
350 r = hdev->ops->target_from_gate(hdev, gate, targets);
351 else
352 r = -EPROTO;
353 if (r < 0)
354 goto exit;
355
356 if (hdev->ops->complete_target_discovered) {
357 r = hdev->ops->complete_target_discovered(hdev, gate,
358 targets);
359 if (r < 0)
360 goto exit;
361 }
362 break;
363 }
364
365 /* if driver set the new gate, we will skip the old one */
366 if (targets->hci_reader_gate == 0x00)
367 targets->hci_reader_gate = gate;
368
369 r = nfc_targets_found(hdev->ndev, targets, 1);
370
371exit:
372 kfree(targets);
373 kfree_skb(atqa_skb);
374 kfree_skb(sak_skb);
375 kfree_skb(uid_skb);
376
377 return r;
378}
379EXPORT_SYMBOL(nfc_hci_target_discovered);
380
381void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
382 struct sk_buff *skb)
383{
384 int r = 0;
385 u8 gate;
386
387 if (pipe >= NFC_HCI_MAX_PIPES) {
388 pr_err("Discarded event %x to invalid pipe %x\n", event, pipe);
389 goto exit;
390 }
391
392 gate = hdev->pipes[pipe].gate;
393 if (gate == NFC_HCI_INVALID_GATE) {
394 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
395 goto exit;
396 }
397
398 if (hdev->ops->event_received) {
399 r = hdev->ops->event_received(hdev, pipe, event, skb);
400 if (r <= 0)
401 goto exit_noskb;
402 }
403
404 switch (event) {
405 case NFC_HCI_EVT_TARGET_DISCOVERED:
406 if (skb->len < 1) { /* no status data? */
407 r = -EPROTO;
408 goto exit;
409 }
410
411 if (skb->data[0] == 3) {
412 /* TODO: Multiple targets in field, none activated
413 * poll is supposedly stopped, but there is no
414 * single target to activate, so nothing to report
415 * up.
416 * if we need to restart poll, we must save the
417 * protocols from the initial poll and reuse here.
418 */
419 }
420
421 if (skb->data[0] != 0) {
422 r = -EPROTO;
423 goto exit;
424 }
425
426 r = nfc_hci_target_discovered(hdev, gate);
427 break;
428 default:
429 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
430 r = -EINVAL;
431 break;
432 }
433
434exit:
435 kfree_skb(skb);
436
437exit_noskb:
438 if (r)
439 nfc_hci_driver_failure(hdev, r);
440}
441
442static void nfc_hci_cmd_timeout(struct timer_list *t)
443{
444 struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
445
446 schedule_work(&hdev->msg_tx_work);
447}
448
449static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
450 const struct nfc_hci_gate *gates)
451{
452 int r;
453 while (gate_count--) {
454 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
455 gates->gate, gates->pipe);
456 if (r < 0)
457 return r;
458 gates++;
459 }
460
461 return 0;
462}
463
464static int hci_dev_session_init(struct nfc_hci_dev *hdev)
465{
466 struct sk_buff *skb = NULL;
467 int r;
468
469 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
470 return -EPROTO;
471
472 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
473 hdev->init_data.gates[0].gate,
474 hdev->init_data.gates[0].pipe);
475 if (r < 0)
476 goto exit;
477
478 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
479 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
480 if (r < 0)
481 goto disconnect_all;
482
483 if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
484 (memcmp(hdev->init_data.session_id, skb->data,
485 skb->len) == 0) && hdev->ops->load_session) {
486 /* Restore gate<->pipe table from some proprietary location. */
487
488 r = hdev->ops->load_session(hdev);
489
490 if (r < 0)
491 goto disconnect_all;
492 } else {
493
494 r = nfc_hci_disconnect_all_gates(hdev);
495 if (r < 0)
496 goto exit;
497
498 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
499 hdev->init_data.gates);
500 if (r < 0)
501 goto disconnect_all;
502
503 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
504 NFC_HCI_ADMIN_SESSION_IDENTITY,
505 hdev->init_data.session_id,
506 strlen(hdev->init_data.session_id));
507 }
508 if (r == 0)
509 goto exit;
510
511disconnect_all:
512 nfc_hci_disconnect_all_gates(hdev);
513
514exit:
515 kfree_skb(skb);
516
517 return r;
518}
519
520static int hci_dev_version(struct nfc_hci_dev *hdev)
521{
522 int r;
523 struct sk_buff *skb;
524
525 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
526 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
527 if (r == -EOPNOTSUPP) {
528 pr_info("Software/Hardware info not available\n");
529 return 0;
530 }
531 if (r < 0)
532 return r;
533
534 if (skb->len != 3) {
535 kfree_skb(skb);
536 return -EINVAL;
537 }
538
539 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
540 hdev->sw_patch = skb->data[0] & 0x0f;
541 hdev->sw_flashlib_major = skb->data[1];
542 hdev->sw_flashlib_minor = skb->data[2];
543
544 kfree_skb(skb);
545
546 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
547 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
548 if (r < 0)
549 return r;
550
551 if (skb->len != 3) {
552 kfree_skb(skb);
553 return -EINVAL;
554 }
555
556 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
557 hdev->hw_version = skb->data[0] & 0x1f;
558 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
559 hdev->hw_software = skb->data[1] & 0x3f;
560 hdev->hw_bsid = skb->data[2];
561
562 kfree_skb(skb);
563
564 pr_info("SOFTWARE INFO:\n");
565 pr_info("RomLib : %d\n", hdev->sw_romlib);
566 pr_info("Patch : %d\n", hdev->sw_patch);
567 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
568 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
569 pr_info("HARDWARE INFO:\n");
570 pr_info("Derivative : %d\n", hdev->hw_derivative);
571 pr_info("HW Version : %d\n", hdev->hw_version);
572 pr_info("#MPW : %d\n", hdev->hw_mpw);
573 pr_info("Software : %d\n", hdev->hw_software);
574 pr_info("BSID Version : %d\n", hdev->hw_bsid);
575
576 return 0;
577}
578
579static int hci_dev_up(struct nfc_dev *nfc_dev)
580{
581 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
582 int r = 0;
583
584 if (hdev->ops->open) {
585 r = hdev->ops->open(hdev);
586 if (r < 0)
587 return r;
588 }
589
590 r = nfc_llc_start(hdev->llc);
591 if (r < 0)
592 goto exit_close;
593
594 r = hci_dev_session_init(hdev);
595 if (r < 0)
596 goto exit_llc;
597
598 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
599 NFC_HCI_EVT_END_OPERATION, NULL, 0);
600 if (r < 0)
601 goto exit_llc;
602
603 if (hdev->ops->hci_ready) {
604 r = hdev->ops->hci_ready(hdev);
605 if (r < 0)
606 goto exit_llc;
607 }
608
609 r = hci_dev_version(hdev);
610 if (r < 0)
611 goto exit_llc;
612
613 return 0;
614
615exit_llc:
616 nfc_llc_stop(hdev->llc);
617
618exit_close:
619 if (hdev->ops->close)
620 hdev->ops->close(hdev);
621
622 return r;
623}
624
625static int hci_dev_down(struct nfc_dev *nfc_dev)
626{
627 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
628
629 nfc_llc_stop(hdev->llc);
630
631 if (hdev->ops->close)
632 hdev->ops->close(hdev);
633
634 nfc_hci_reset_pipes(hdev);
635
636 return 0;
637}
638
639static int hci_start_poll(struct nfc_dev *nfc_dev,
640 u32 im_protocols, u32 tm_protocols)
641{
642 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
643
644 if (hdev->ops->start_poll)
645 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
646 else
647 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
648 NFC_HCI_EVT_READER_REQUESTED,
649 NULL, 0);
650}
651
652static void hci_stop_poll(struct nfc_dev *nfc_dev)
653{
654 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
655
656 if (hdev->ops->stop_poll)
657 hdev->ops->stop_poll(hdev);
658 else
659 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
660 NFC_HCI_EVT_END_OPERATION, NULL, 0);
661}
662
663static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
664 __u8 comm_mode, __u8 *gb, size_t gb_len)
665{
666 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
667
668 if (!hdev->ops->dep_link_up)
669 return 0;
670
671 return hdev->ops->dep_link_up(hdev, target, comm_mode,
672 gb, gb_len);
673}
674
675static int hci_dep_link_down(struct nfc_dev *nfc_dev)
676{
677 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
678
679 if (!hdev->ops->dep_link_down)
680 return 0;
681
682 return hdev->ops->dep_link_down(hdev);
683}
684
685static int hci_activate_target(struct nfc_dev *nfc_dev,
686 struct nfc_target *target, u32 protocol)
687{
688 return 0;
689}
690
691static void hci_deactivate_target(struct nfc_dev *nfc_dev,
692 struct nfc_target *target,
693 u8 mode)
694{
695}
696
697#define HCI_CB_TYPE_TRANSCEIVE 1
698
699static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
700{
701 struct nfc_hci_dev *hdev = context;
702
703 switch (hdev->async_cb_type) {
704 case HCI_CB_TYPE_TRANSCEIVE:
705 /*
706 * TODO: Check RF Error indicator to make sure data is valid.
707 * It seems that HCI cmd can complete without error, but data
708 * can be invalid if an RF error occurred? Ignore for now.
709 */
710 if (err == 0)
711 skb_trim(skb, skb->len - 1); /* RF Err ind */
712
713 hdev->async_cb(hdev->async_cb_context, skb, err);
714 break;
715 default:
716 if (err == 0)
717 kfree_skb(skb);
718 break;
719 }
720}
721
722static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
723 struct sk_buff *skb, data_exchange_cb_t cb,
724 void *cb_context)
725{
726 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
727 int r;
728
729 pr_debug("target_idx=%d\n", target->idx);
730
731 switch (target->hci_reader_gate) {
732 case NFC_HCI_RF_READER_A_GATE:
733 case NFC_HCI_RF_READER_B_GATE:
734 if (hdev->ops->im_transceive) {
735 r = hdev->ops->im_transceive(hdev, target, skb, cb,
736 cb_context);
737 if (r <= 0) /* handled */
738 break;
739 }
740
741 *(u8 *)skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
742
743 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
744 hdev->async_cb = cb;
745 hdev->async_cb_context = cb_context;
746
747 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
748 NFC_HCI_WR_XCHG_DATA, skb->data,
749 skb->len, hci_transceive_cb, hdev);
750 break;
751 default:
752 if (hdev->ops->im_transceive) {
753 r = hdev->ops->im_transceive(hdev, target, skb, cb,
754 cb_context);
755 if (r == 1)
756 r = -ENOTSUPP;
757 } else {
758 r = -ENOTSUPP;
759 }
760 break;
761 }
762
763 kfree_skb(skb);
764
765 return r;
766}
767
768static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
769{
770 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
771
772 if (!hdev->ops->tm_send) {
773 kfree_skb(skb);
774 return -ENOTSUPP;
775 }
776
777 return hdev->ops->tm_send(hdev, skb);
778}
779
780static int hci_check_presence(struct nfc_dev *nfc_dev,
781 struct nfc_target *target)
782{
783 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
784
785 if (!hdev->ops->check_presence)
786 return 0;
787
788 return hdev->ops->check_presence(hdev, target);
789}
790
791static int hci_discover_se(struct nfc_dev *nfc_dev)
792{
793 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
794
795 if (hdev->ops->discover_se)
796 return hdev->ops->discover_se(hdev);
797
798 return 0;
799}
800
801static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
802{
803 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
804
805 if (hdev->ops->enable_se)
806 return hdev->ops->enable_se(hdev, se_idx);
807
808 return 0;
809}
810
811static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
812{
813 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
814
815 if (hdev->ops->disable_se)
816 return hdev->ops->disable_se(hdev, se_idx);
817
818 return 0;
819}
820
821static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
822 u8 *apdu, size_t apdu_length,
823 se_io_cb_t cb, void *cb_context)
824{
825 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
826
827 if (hdev->ops->se_io)
828 return hdev->ops->se_io(hdev, se_idx, apdu,
829 apdu_length, cb, cb_context);
830
831 return 0;
832}
833
834static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
835{
836 mutex_lock(&hdev->msg_tx_mutex);
837
838 if (hdev->cmd_pending_msg == NULL) {
839 nfc_driver_failure(hdev->ndev, err);
840 goto exit;
841 }
842
843 __nfc_hci_cmd_completion(hdev, err, NULL);
844
845exit:
846 mutex_unlock(&hdev->msg_tx_mutex);
847}
848
849static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
850{
851 nfc_hci_failure(hdev, err);
852}
853
854static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
855{
856 struct hcp_packet *packet;
857 u8 type;
858 u8 instruction;
859 struct sk_buff *hcp_skb;
860 u8 pipe;
861 struct sk_buff *frag_skb;
862 int msg_len;
863
864 packet = (struct hcp_packet *)skb->data;
865 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
866 skb_queue_tail(&hdev->rx_hcp_frags, skb);
867 return;
868 }
869
870 /* it's the last fragment. Does it need re-aggregation? */
871 if (skb_queue_len(&hdev->rx_hcp_frags)) {
872 pipe = packet->header & NFC_HCI_FRAGMENT;
873 skb_queue_tail(&hdev->rx_hcp_frags, skb);
874
875 msg_len = 0;
876 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
877 msg_len += (frag_skb->len -
878 NFC_HCI_HCP_PACKET_HEADER_LEN);
879 }
880
881 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
882 msg_len, GFP_KERNEL);
883 if (hcp_skb == NULL) {
884 nfc_hci_failure(hdev, -ENOMEM);
885 return;
886 }
887
888 skb_put_u8(hcp_skb, pipe);
889
890 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
891 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
892 skb_put_data(hcp_skb,
893 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
894 msg_len);
895 }
896
897 skb_queue_purge(&hdev->rx_hcp_frags);
898 } else {
899 packet->header &= NFC_HCI_FRAGMENT;
900 hcp_skb = skb;
901 }
902
903 /* if this is a response, dispatch immediately to
904 * unblock waiting cmd context. Otherwise, enqueue to dispatch
905 * in separate context where handler can also execute command.
906 */
907 packet = (struct hcp_packet *)hcp_skb->data;
908 type = HCP_MSG_GET_TYPE(packet->message.header);
909 if (type == NFC_HCI_HCP_RESPONSE) {
910 pipe = packet->header;
911 instruction = HCP_MSG_GET_CMD(packet->message.header);
912 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
913 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
914 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
915 } else {
916 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
917 schedule_work(&hdev->msg_rx_work);
918 }
919}
920
921static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
922{
923 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
924
925 if (!hdev->ops->fw_download)
926 return -ENOTSUPP;
927
928 return hdev->ops->fw_download(hdev, firmware_name);
929}
930
931static const struct nfc_ops hci_nfc_ops = {
932 .dev_up = hci_dev_up,
933 .dev_down = hci_dev_down,
934 .start_poll = hci_start_poll,
935 .stop_poll = hci_stop_poll,
936 .dep_link_up = hci_dep_link_up,
937 .dep_link_down = hci_dep_link_down,
938 .activate_target = hci_activate_target,
939 .deactivate_target = hci_deactivate_target,
940 .im_transceive = hci_transceive,
941 .tm_send = hci_tm_send,
942 .check_presence = hci_check_presence,
943 .fw_download = hci_fw_download,
944 .discover_se = hci_discover_se,
945 .enable_se = hci_enable_se,
946 .disable_se = hci_disable_se,
947 .se_io = hci_se_io,
948};
949
950struct nfc_hci_dev *nfc_hci_allocate_device(const struct nfc_hci_ops *ops,
951 struct nfc_hci_init_data *init_data,
952 unsigned long quirks,
953 u32 protocols,
954 const char *llc_name,
955 int tx_headroom,
956 int tx_tailroom,
957 int max_link_payload)
958{
959 struct nfc_hci_dev *hdev;
960
961 if (ops->xmit == NULL)
962 return NULL;
963
964 if (protocols == 0)
965 return NULL;
966
967 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
968 if (hdev == NULL)
969 return NULL;
970
971 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
972 nfc_hci_recv_from_llc, tx_headroom,
973 tx_tailroom, nfc_hci_llc_failure);
974 if (hdev->llc == NULL) {
975 kfree(hdev);
976 return NULL;
977 }
978
979 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
980 tx_headroom + HCI_CMDS_HEADROOM,
981 tx_tailroom);
982 if (!hdev->ndev) {
983 nfc_llc_free(hdev->llc);
984 kfree(hdev);
985 return NULL;
986 }
987
988 hdev->ops = ops;
989 hdev->max_data_link_payload = max_link_payload;
990 hdev->init_data = *init_data;
991
992 nfc_set_drvdata(hdev->ndev, hdev);
993
994 nfc_hci_reset_pipes(hdev);
995
996 hdev->quirks = quirks;
997
998 return hdev;
999}
1000EXPORT_SYMBOL(nfc_hci_allocate_device);
1001
1002void nfc_hci_free_device(struct nfc_hci_dev *hdev)
1003{
1004 nfc_free_device(hdev->ndev);
1005 nfc_llc_free(hdev->llc);
1006 kfree(hdev);
1007}
1008EXPORT_SYMBOL(nfc_hci_free_device);
1009
1010int nfc_hci_register_device(struct nfc_hci_dev *hdev)
1011{
1012 mutex_init(&hdev->msg_tx_mutex);
1013
1014 INIT_LIST_HEAD(&hdev->msg_tx_queue);
1015
1016 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1017
1018 timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
1019
1020 skb_queue_head_init(&hdev->rx_hcp_frags);
1021
1022 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1023
1024 skb_queue_head_init(&hdev->msg_rx_queue);
1025
1026 return nfc_register_device(hdev->ndev);
1027}
1028EXPORT_SYMBOL(nfc_hci_register_device);
1029
1030void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1031{
1032 struct hci_msg *msg, *n;
1033
1034 mutex_lock(&hdev->msg_tx_mutex);
1035
1036 if (hdev->cmd_pending_msg) {
1037 if (hdev->cmd_pending_msg->cb)
1038 hdev->cmd_pending_msg->cb(
1039 hdev->cmd_pending_msg->cb_context,
1040 NULL, -ESHUTDOWN);
1041 kfree(hdev->cmd_pending_msg);
1042 hdev->cmd_pending_msg = NULL;
1043 }
1044
1045 hdev->shutting_down = true;
1046
1047 mutex_unlock(&hdev->msg_tx_mutex);
1048
1049 del_timer_sync(&hdev->cmd_timer);
1050 cancel_work_sync(&hdev->msg_tx_work);
1051
1052 cancel_work_sync(&hdev->msg_rx_work);
1053
1054 nfc_unregister_device(hdev->ndev);
1055
1056 skb_queue_purge(&hdev->rx_hcp_frags);
1057 skb_queue_purge(&hdev->msg_rx_queue);
1058
1059 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1060 list_del(&msg->msg_l);
1061 skb_queue_purge(&msg->msg_frags);
1062 kfree(msg);
1063 }
1064}
1065EXPORT_SYMBOL(nfc_hci_unregister_device);
1066
1067void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1068{
1069 hdev->clientdata = clientdata;
1070}
1071EXPORT_SYMBOL(nfc_hci_set_clientdata);
1072
1073void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1074{
1075 return hdev->clientdata;
1076}
1077EXPORT_SYMBOL(nfc_hci_get_clientdata);
1078
1079void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1080{
1081 nfc_hci_failure(hdev, err);
1082}
1083EXPORT_SYMBOL(nfc_hci_driver_failure);
1084
1085void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1086{
1087 nfc_llc_rcv_from_drv(hdev->llc, skb);
1088}
1089EXPORT_SYMBOL(nfc_hci_recv_frame);
1090
1091static int __init nfc_hci_init(void)
1092{
1093 return nfc_llc_init();
1094}
1095
1096static void __exit nfc_hci_exit(void)
1097{
1098 nfc_llc_exit();
1099}
1100
1101subsys_initcall(nfc_hci_init);
1102module_exit(nfc_hci_exit);
1103
1104MODULE_LICENSE("GPL");
1105MODULE_DESCRIPTION("NFC HCI Core");
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
34int 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}
47EXPORT_SYMBOL(nfc_hci_result_to_errno);
48
49static void nfc_hci_msg_tx_work(struct work_struct *work)
50{
51 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
52 msg_tx_work);
53 struct hci_msg *msg;
54 struct sk_buff *skb;
55 int r = 0;
56
57 mutex_lock(&hdev->msg_tx_mutex);
58 if (hdev->shutting_down)
59 goto exit;
60
61 if (hdev->cmd_pending_msg) {
62 if (timer_pending(&hdev->cmd_timer) == 0) {
63 if (hdev->cmd_pending_msg->cb)
64 hdev->cmd_pending_msg->cb(hdev->
65 cmd_pending_msg->
66 cb_context,
67 NULL,
68 -ETIME);
69 kfree(hdev->cmd_pending_msg);
70 hdev->cmd_pending_msg = NULL;
71 } else {
72 goto exit;
73 }
74 }
75
76next_msg:
77 if (list_empty(&hdev->msg_tx_queue))
78 goto exit;
79
80 msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
81 list_del(&msg->msg_l);
82
83 pr_debug("msg_tx_queue has a cmd to send\n");
84 while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
85 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
86 if (r < 0) {
87 kfree_skb(skb);
88 skb_queue_purge(&msg->msg_frags);
89 if (msg->cb)
90 msg->cb(msg->cb_context, NULL, r);
91 kfree(msg);
92 break;
93 }
94 }
95
96 if (r)
97 goto next_msg;
98
99 if (msg->wait_response == false) {
100 kfree(msg);
101 goto next_msg;
102 }
103
104 hdev->cmd_pending_msg = msg;
105 mod_timer(&hdev->cmd_timer, jiffies +
106 msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
107
108exit:
109 mutex_unlock(&hdev->msg_tx_mutex);
110}
111
112static void nfc_hci_msg_rx_work(struct work_struct *work)
113{
114 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
115 msg_rx_work);
116 struct sk_buff *skb;
117 struct hcp_message *message;
118 u8 pipe;
119 u8 type;
120 u8 instruction;
121
122 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
123 pipe = skb->data[0];
124 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
125 message = (struct hcp_message *)skb->data;
126 type = HCP_MSG_GET_TYPE(message->header);
127 instruction = HCP_MSG_GET_CMD(message->header);
128 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
129
130 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
131 }
132}
133
134static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
135 struct sk_buff *skb)
136{
137 del_timer_sync(&hdev->cmd_timer);
138
139 if (hdev->cmd_pending_msg->cb)
140 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
141 skb, err);
142 else
143 kfree_skb(skb);
144
145 kfree(hdev->cmd_pending_msg);
146 hdev->cmd_pending_msg = NULL;
147
148 schedule_work(&hdev->msg_tx_work);
149}
150
151void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
152 struct sk_buff *skb)
153{
154 mutex_lock(&hdev->msg_tx_mutex);
155
156 if (hdev->cmd_pending_msg == NULL) {
157 kfree_skb(skb);
158 goto exit;
159 }
160
161 __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
162
163exit:
164 mutex_unlock(&hdev->msg_tx_mutex);
165}
166
167void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
168 struct sk_buff *skb)
169{
170 kfree_skb(skb);
171}
172
173u32 nfc_hci_sak_to_protocol(u8 sak)
174{
175 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
176 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
177 return NFC_PROTO_MIFARE_MASK;
178 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
179 return NFC_PROTO_ISO14443_MASK;
180 case NFC_HCI_TYPE_A_SEL_PROT_DEP:
181 return NFC_PROTO_NFC_DEP_MASK;
182 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
183 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
184 default:
185 return 0xffffffff;
186 }
187}
188EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
189
190int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
191{
192 struct nfc_target *targets;
193 struct sk_buff *atqa_skb = NULL;
194 struct sk_buff *sak_skb = NULL;
195 struct sk_buff *uid_skb = NULL;
196 int r;
197
198 pr_debug("from gate %d\n", gate);
199
200 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
201 if (targets == NULL)
202 return -ENOMEM;
203
204 switch (gate) {
205 case NFC_HCI_RF_READER_A_GATE:
206 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
207 NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
208 if (r < 0)
209 goto exit;
210
211 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
212 NFC_HCI_RF_READER_A_SAK, &sak_skb);
213 if (r < 0)
214 goto exit;
215
216 if (atqa_skb->len != 2 || sak_skb->len != 1) {
217 r = -EPROTO;
218 goto exit;
219 }
220
221 targets->supported_protocols =
222 nfc_hci_sak_to_protocol(sak_skb->data[0]);
223 if (targets->supported_protocols == 0xffffffff) {
224 r = -EPROTO;
225 goto exit;
226 }
227
228 targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
229 targets->sel_res = sak_skb->data[0];
230
231 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
232 NFC_HCI_RF_READER_A_UID, &uid_skb);
233 if (r < 0)
234 goto exit;
235
236 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
237 r = -EPROTO;
238 goto exit;
239 }
240
241 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
242 targets->nfcid1_len = uid_skb->len;
243
244 if (hdev->ops->complete_target_discovered) {
245 r = hdev->ops->complete_target_discovered(hdev, gate,
246 targets);
247 if (r < 0)
248 goto exit;
249 }
250 break;
251 case NFC_HCI_RF_READER_B_GATE:
252 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
253 break;
254 default:
255 if (hdev->ops->target_from_gate)
256 r = hdev->ops->target_from_gate(hdev, gate, targets);
257 else
258 r = -EPROTO;
259 if (r < 0)
260 goto exit;
261
262 if (hdev->ops->complete_target_discovered) {
263 r = hdev->ops->complete_target_discovered(hdev, gate,
264 targets);
265 if (r < 0)
266 goto exit;
267 }
268 break;
269 }
270
271 /* if driver set the new gate, we will skip the old one */
272 if (targets->hci_reader_gate == 0x00)
273 targets->hci_reader_gate = gate;
274
275 r = nfc_targets_found(hdev->ndev, targets, 1);
276
277exit:
278 kfree(targets);
279 kfree_skb(atqa_skb);
280 kfree_skb(sak_skb);
281 kfree_skb(uid_skb);
282
283 return r;
284}
285EXPORT_SYMBOL(nfc_hci_target_discovered);
286
287void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
288 struct sk_buff *skb)
289{
290 int r = 0;
291 u8 gate = nfc_hci_pipe2gate(hdev, pipe);
292
293 if (gate == 0xff) {
294 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
295 goto exit;
296 }
297
298 if (hdev->ops->event_received) {
299 r = hdev->ops->event_received(hdev, gate, event, skb);
300 if (r <= 0)
301 goto exit_noskb;
302 }
303
304 switch (event) {
305 case NFC_HCI_EVT_TARGET_DISCOVERED:
306 if (skb->len < 1) { /* no status data? */
307 r = -EPROTO;
308 goto exit;
309 }
310
311 if (skb->data[0] == 3) {
312 /* TODO: Multiple targets in field, none activated
313 * poll is supposedly stopped, but there is no
314 * single target to activate, so nothing to report
315 * up.
316 * if we need to restart poll, we must save the
317 * protocols from the initial poll and reuse here.
318 */
319 }
320
321 if (skb->data[0] != 0) {
322 r = -EPROTO;
323 goto exit;
324 }
325
326 r = nfc_hci_target_discovered(hdev, gate);
327 break;
328 default:
329 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
330 r = -EINVAL;
331 break;
332 }
333
334exit:
335 kfree_skb(skb);
336
337exit_noskb:
338 if (r)
339 nfc_hci_driver_failure(hdev, r);
340}
341
342static void nfc_hci_cmd_timeout(unsigned long data)
343{
344 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
345
346 schedule_work(&hdev->msg_tx_work);
347}
348
349static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
350 struct nfc_hci_gate *gates)
351{
352 int r;
353 while (gate_count--) {
354 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
355 gates->gate, gates->pipe);
356 if (r < 0)
357 return r;
358 gates++;
359 }
360
361 return 0;
362}
363
364static int hci_dev_session_init(struct nfc_hci_dev *hdev)
365{
366 struct sk_buff *skb = NULL;
367 int r;
368
369 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
370 return -EPROTO;
371
372 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
373 hdev->init_data.gates[0].gate,
374 hdev->init_data.gates[0].pipe);
375 if (r < 0)
376 goto exit;
377
378 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
379 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
380 if (r < 0)
381 goto disconnect_all;
382
383 if (skb->len && skb->len == strlen(hdev->init_data.session_id))
384 if (memcmp(hdev->init_data.session_id, skb->data,
385 skb->len) == 0) {
386 /* TODO ELa: restore gate<->pipe table from
387 * some TBD location.
388 * note: it doesn't seem possible to get the chip
389 * currently open gate/pipe table.
390 * It is only possible to obtain the supported
391 * gate list.
392 */
393
394 /* goto exit
395 * For now, always do a full initialization */
396 }
397
398 r = nfc_hci_disconnect_all_gates(hdev);
399 if (r < 0)
400 goto exit;
401
402 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
403 hdev->init_data.gates);
404 if (r < 0)
405 goto disconnect_all;
406
407 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
408 NFC_HCI_ADMIN_SESSION_IDENTITY,
409 hdev->init_data.session_id,
410 strlen(hdev->init_data.session_id));
411 if (r == 0)
412 goto exit;
413
414disconnect_all:
415 nfc_hci_disconnect_all_gates(hdev);
416
417exit:
418 kfree_skb(skb);
419
420 return r;
421}
422
423static int hci_dev_version(struct nfc_hci_dev *hdev)
424{
425 int r;
426 struct sk_buff *skb;
427
428 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
429 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
430 if (r == -EOPNOTSUPP) {
431 pr_info("Software/Hardware info not available\n");
432 return 0;
433 }
434 if (r < 0)
435 return r;
436
437 if (skb->len != 3) {
438 kfree_skb(skb);
439 return -EINVAL;
440 }
441
442 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
443 hdev->sw_patch = skb->data[0] & 0x0f;
444 hdev->sw_flashlib_major = skb->data[1];
445 hdev->sw_flashlib_minor = skb->data[2];
446
447 kfree_skb(skb);
448
449 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
450 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
451 if (r < 0)
452 return r;
453
454 if (skb->len != 3) {
455 kfree_skb(skb);
456 return -EINVAL;
457 }
458
459 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
460 hdev->hw_version = skb->data[0] & 0x1f;
461 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
462 hdev->hw_software = skb->data[1] & 0x3f;
463 hdev->hw_bsid = skb->data[2];
464
465 kfree_skb(skb);
466
467 pr_info("SOFTWARE INFO:\n");
468 pr_info("RomLib : %d\n", hdev->sw_romlib);
469 pr_info("Patch : %d\n", hdev->sw_patch);
470 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
471 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
472 pr_info("HARDWARE INFO:\n");
473 pr_info("Derivative : %d\n", hdev->hw_derivative);
474 pr_info("HW Version : %d\n", hdev->hw_version);
475 pr_info("#MPW : %d\n", hdev->hw_mpw);
476 pr_info("Software : %d\n", hdev->hw_software);
477 pr_info("BSID Version : %d\n", hdev->hw_bsid);
478
479 return 0;
480}
481
482static int hci_dev_up(struct nfc_dev *nfc_dev)
483{
484 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
485 int r = 0;
486
487 if (hdev->ops->open) {
488 r = hdev->ops->open(hdev);
489 if (r < 0)
490 return r;
491 }
492
493 r = nfc_llc_start(hdev->llc);
494 if (r < 0)
495 goto exit_close;
496
497 r = hci_dev_session_init(hdev);
498 if (r < 0)
499 goto exit_llc;
500
501 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
502 NFC_HCI_EVT_END_OPERATION, NULL, 0);
503 if (r < 0)
504 goto exit_llc;
505
506 if (hdev->ops->hci_ready) {
507 r = hdev->ops->hci_ready(hdev);
508 if (r < 0)
509 goto exit_llc;
510 }
511
512 r = hci_dev_version(hdev);
513 if (r < 0)
514 goto exit_llc;
515
516 return 0;
517
518exit_llc:
519 nfc_llc_stop(hdev->llc);
520
521exit_close:
522 if (hdev->ops->close)
523 hdev->ops->close(hdev);
524
525 return r;
526}
527
528static int hci_dev_down(struct nfc_dev *nfc_dev)
529{
530 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
531
532 nfc_llc_stop(hdev->llc);
533
534 if (hdev->ops->close)
535 hdev->ops->close(hdev);
536
537 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
538
539 return 0;
540}
541
542static int hci_start_poll(struct nfc_dev *nfc_dev,
543 u32 im_protocols, u32 tm_protocols)
544{
545 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
546
547 if (hdev->ops->start_poll)
548 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
549 else
550 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
551 NFC_HCI_EVT_READER_REQUESTED,
552 NULL, 0);
553}
554
555static void hci_stop_poll(struct nfc_dev *nfc_dev)
556{
557 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
558
559 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
560 NFC_HCI_EVT_END_OPERATION, NULL, 0);
561}
562
563static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
564 __u8 comm_mode, __u8 *gb, size_t gb_len)
565{
566 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
567
568 if (!hdev->ops->dep_link_up)
569 return 0;
570
571 return hdev->ops->dep_link_up(hdev, target, comm_mode,
572 gb, gb_len);
573}
574
575static int hci_dep_link_down(struct nfc_dev *nfc_dev)
576{
577 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
578
579 if (!hdev->ops->dep_link_down)
580 return 0;
581
582 return hdev->ops->dep_link_down(hdev);
583}
584
585static int hci_activate_target(struct nfc_dev *nfc_dev,
586 struct nfc_target *target, u32 protocol)
587{
588 return 0;
589}
590
591static void hci_deactivate_target(struct nfc_dev *nfc_dev,
592 struct nfc_target *target)
593{
594}
595
596#define HCI_CB_TYPE_TRANSCEIVE 1
597
598static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
599{
600 struct nfc_hci_dev *hdev = context;
601
602 switch (hdev->async_cb_type) {
603 case HCI_CB_TYPE_TRANSCEIVE:
604 /*
605 * TODO: Check RF Error indicator to make sure data is valid.
606 * It seems that HCI cmd can complete without error, but data
607 * can be invalid if an RF error occured? Ignore for now.
608 */
609 if (err == 0)
610 skb_trim(skb, skb->len - 1); /* RF Err ind */
611
612 hdev->async_cb(hdev->async_cb_context, skb, err);
613 break;
614 default:
615 if (err == 0)
616 kfree_skb(skb);
617 break;
618 }
619}
620
621static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
622 struct sk_buff *skb, data_exchange_cb_t cb,
623 void *cb_context)
624{
625 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
626 int r;
627
628 pr_debug("target_idx=%d\n", target->idx);
629
630 switch (target->hci_reader_gate) {
631 case NFC_HCI_RF_READER_A_GATE:
632 case NFC_HCI_RF_READER_B_GATE:
633 if (hdev->ops->im_transceive) {
634 r = hdev->ops->im_transceive(hdev, target, skb, cb,
635 cb_context);
636 if (r <= 0) /* handled */
637 break;
638 }
639
640 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
641
642 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
643 hdev->async_cb = cb;
644 hdev->async_cb_context = cb_context;
645
646 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
647 NFC_HCI_WR_XCHG_DATA, skb->data,
648 skb->len, hci_transceive_cb, hdev);
649 break;
650 default:
651 if (hdev->ops->im_transceive) {
652 r = hdev->ops->im_transceive(hdev, target, skb, cb,
653 cb_context);
654 if (r == 1)
655 r = -ENOTSUPP;
656 } else {
657 r = -ENOTSUPP;
658 }
659 break;
660 }
661
662 kfree_skb(skb);
663
664 return r;
665}
666
667static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
668{
669 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
670
671 if (!hdev->ops->tm_send) {
672 kfree_skb(skb);
673 return -ENOTSUPP;
674 }
675
676 return hdev->ops->tm_send(hdev, skb);
677}
678
679static int hci_check_presence(struct nfc_dev *nfc_dev,
680 struct nfc_target *target)
681{
682 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
683
684 if (!hdev->ops->check_presence)
685 return 0;
686
687 return hdev->ops->check_presence(hdev, target);
688}
689
690static int hci_discover_se(struct nfc_dev *nfc_dev)
691{
692 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
693
694 if (hdev->ops->discover_se)
695 return hdev->ops->discover_se(hdev);
696
697 return 0;
698}
699
700static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
701{
702 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
703
704 if (hdev->ops->enable_se)
705 return hdev->ops->enable_se(hdev, se_idx);
706
707 return 0;
708}
709
710static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
711{
712 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
713
714 if (hdev->ops->disable_se)
715 return hdev->ops->disable_se(hdev, se_idx);
716
717 return 0;
718}
719
720static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
721{
722 mutex_lock(&hdev->msg_tx_mutex);
723
724 if (hdev->cmd_pending_msg == NULL) {
725 nfc_driver_failure(hdev->ndev, err);
726 goto exit;
727 }
728
729 __nfc_hci_cmd_completion(hdev, err, NULL);
730
731exit:
732 mutex_unlock(&hdev->msg_tx_mutex);
733}
734
735static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
736{
737 nfc_hci_failure(hdev, err);
738}
739
740static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
741{
742 struct hcp_packet *packet;
743 u8 type;
744 u8 instruction;
745 struct sk_buff *hcp_skb;
746 u8 pipe;
747 struct sk_buff *frag_skb;
748 int msg_len;
749
750 packet = (struct hcp_packet *)skb->data;
751 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
752 skb_queue_tail(&hdev->rx_hcp_frags, skb);
753 return;
754 }
755
756 /* it's the last fragment. Does it need re-aggregation? */
757 if (skb_queue_len(&hdev->rx_hcp_frags)) {
758 pipe = packet->header & NFC_HCI_FRAGMENT;
759 skb_queue_tail(&hdev->rx_hcp_frags, skb);
760
761 msg_len = 0;
762 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
763 msg_len += (frag_skb->len -
764 NFC_HCI_HCP_PACKET_HEADER_LEN);
765 }
766
767 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
768 msg_len, GFP_KERNEL);
769 if (hcp_skb == NULL) {
770 nfc_hci_failure(hdev, -ENOMEM);
771 return;
772 }
773
774 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
775
776 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
777 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
778 memcpy(skb_put(hcp_skb, msg_len),
779 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
780 msg_len);
781 }
782
783 skb_queue_purge(&hdev->rx_hcp_frags);
784 } else {
785 packet->header &= NFC_HCI_FRAGMENT;
786 hcp_skb = skb;
787 }
788
789 /* if this is a response, dispatch immediately to
790 * unblock waiting cmd context. Otherwise, enqueue to dispatch
791 * in separate context where handler can also execute command.
792 */
793 packet = (struct hcp_packet *)hcp_skb->data;
794 type = HCP_MSG_GET_TYPE(packet->message.header);
795 if (type == NFC_HCI_HCP_RESPONSE) {
796 pipe = packet->header;
797 instruction = HCP_MSG_GET_CMD(packet->message.header);
798 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
799 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
800 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
801 } else {
802 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
803 schedule_work(&hdev->msg_rx_work);
804 }
805}
806
807static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
808{
809 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
810
811 if (!hdev->ops->fw_download)
812 return -ENOTSUPP;
813
814 return hdev->ops->fw_download(hdev, firmware_name);
815}
816
817static struct nfc_ops hci_nfc_ops = {
818 .dev_up = hci_dev_up,
819 .dev_down = hci_dev_down,
820 .start_poll = hci_start_poll,
821 .stop_poll = hci_stop_poll,
822 .dep_link_up = hci_dep_link_up,
823 .dep_link_down = hci_dep_link_down,
824 .activate_target = hci_activate_target,
825 .deactivate_target = hci_deactivate_target,
826 .im_transceive = hci_transceive,
827 .tm_send = hci_tm_send,
828 .check_presence = hci_check_presence,
829 .fw_download = hci_fw_download,
830 .discover_se = hci_discover_se,
831 .enable_se = hci_enable_se,
832 .disable_se = hci_disable_se,
833};
834
835struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
836 struct nfc_hci_init_data *init_data,
837 unsigned long quirks,
838 u32 protocols,
839 const char *llc_name,
840 int tx_headroom,
841 int tx_tailroom,
842 int max_link_payload)
843{
844 struct nfc_hci_dev *hdev;
845
846 if (ops->xmit == NULL)
847 return NULL;
848
849 if (protocols == 0)
850 return NULL;
851
852 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
853 if (hdev == NULL)
854 return NULL;
855
856 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
857 nfc_hci_recv_from_llc, tx_headroom,
858 tx_tailroom, nfc_hci_llc_failure);
859 if (hdev->llc == NULL) {
860 kfree(hdev);
861 return NULL;
862 }
863
864 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
865 tx_headroom + HCI_CMDS_HEADROOM,
866 tx_tailroom);
867 if (!hdev->ndev) {
868 nfc_llc_free(hdev->llc);
869 kfree(hdev);
870 return NULL;
871 }
872
873 hdev->ops = ops;
874 hdev->max_data_link_payload = max_link_payload;
875 hdev->init_data = *init_data;
876
877 nfc_set_drvdata(hdev->ndev, hdev);
878
879 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
880
881 hdev->quirks = quirks;
882
883 return hdev;
884}
885EXPORT_SYMBOL(nfc_hci_allocate_device);
886
887void nfc_hci_free_device(struct nfc_hci_dev *hdev)
888{
889 nfc_free_device(hdev->ndev);
890 nfc_llc_free(hdev->llc);
891 kfree(hdev);
892}
893EXPORT_SYMBOL(nfc_hci_free_device);
894
895int nfc_hci_register_device(struct nfc_hci_dev *hdev)
896{
897 mutex_init(&hdev->msg_tx_mutex);
898
899 INIT_LIST_HEAD(&hdev->msg_tx_queue);
900
901 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
902
903 init_timer(&hdev->cmd_timer);
904 hdev->cmd_timer.data = (unsigned long)hdev;
905 hdev->cmd_timer.function = nfc_hci_cmd_timeout;
906
907 skb_queue_head_init(&hdev->rx_hcp_frags);
908
909 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
910
911 skb_queue_head_init(&hdev->msg_rx_queue);
912
913 return nfc_register_device(hdev->ndev);
914}
915EXPORT_SYMBOL(nfc_hci_register_device);
916
917void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
918{
919 struct hci_msg *msg, *n;
920
921 mutex_lock(&hdev->msg_tx_mutex);
922
923 if (hdev->cmd_pending_msg) {
924 if (hdev->cmd_pending_msg->cb)
925 hdev->cmd_pending_msg->cb(
926 hdev->cmd_pending_msg->cb_context,
927 NULL, -ESHUTDOWN);
928 kfree(hdev->cmd_pending_msg);
929 hdev->cmd_pending_msg = NULL;
930 }
931
932 hdev->shutting_down = true;
933
934 mutex_unlock(&hdev->msg_tx_mutex);
935
936 del_timer_sync(&hdev->cmd_timer);
937 cancel_work_sync(&hdev->msg_tx_work);
938
939 cancel_work_sync(&hdev->msg_rx_work);
940
941 nfc_unregister_device(hdev->ndev);
942
943 skb_queue_purge(&hdev->rx_hcp_frags);
944 skb_queue_purge(&hdev->msg_rx_queue);
945
946 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
947 list_del(&msg->msg_l);
948 skb_queue_purge(&msg->msg_frags);
949 kfree(msg);
950 }
951}
952EXPORT_SYMBOL(nfc_hci_unregister_device);
953
954void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
955{
956 hdev->clientdata = clientdata;
957}
958EXPORT_SYMBOL(nfc_hci_set_clientdata);
959
960void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
961{
962 return hdev->clientdata;
963}
964EXPORT_SYMBOL(nfc_hci_get_clientdata);
965
966void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
967{
968 nfc_hci_failure(hdev, err);
969}
970EXPORT_SYMBOL(nfc_hci_driver_failure);
971
972void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
973{
974 nfc_llc_rcv_from_drv(hdev->llc, skb);
975}
976EXPORT_SYMBOL(nfc_hci_recv_frame);
977
978static int __init nfc_hci_init(void)
979{
980 return nfc_llc_init();
981}
982
983static void __exit nfc_hci_exit(void)
984{
985 nfc_llc_exit();
986}
987
988subsys_initcall(nfc_hci_init);
989module_exit(nfc_hci_exit);
990
991MODULE_LICENSE("GPL");
992MODULE_DESCRIPTION("NFC HCI Core");