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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 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 gate = hdev->pipes[pipe].gate;
185 u8 status = NFC_HCI_ANY_OK;
186 struct hci_create_pipe_resp *create_info;
187 struct hci_delete_pipe_noti *delete_info;
188 struct hci_all_pipe_cleared_noti *cleared_info;
189
190 pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
191
192 switch (cmd) {
193 case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
194 if (skb->len != 5) {
195 status = NFC_HCI_ANY_E_NOK;
196 goto exit;
197 }
198 create_info = (struct hci_create_pipe_resp *)skb->data;
199
200 if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
201 status = NFC_HCI_ANY_E_NOK;
202 goto exit;
203 }
204
205 /* Save the new created pipe and bind with local gate,
206 * the description for skb->data[3] is destination gate id
207 * but since we received this cmd from host controller, we
208 * are the destination and it is our local gate
209 */
210 hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
211 hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
212 hdev->pipes[create_info->pipe].dest_host =
213 create_info->src_host;
214 break;
215 case NFC_HCI_ANY_OPEN_PIPE:
216 if (gate == NFC_HCI_INVALID_GATE) {
217 status = NFC_HCI_ANY_E_NOK;
218 goto exit;
219 }
220 break;
221 case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
222 if (skb->len != 1) {
223 status = NFC_HCI_ANY_E_NOK;
224 goto exit;
225 }
226 delete_info = (struct hci_delete_pipe_noti *)skb->data;
227
228 if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
229 status = NFC_HCI_ANY_E_NOK;
230 goto exit;
231 }
232
233 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
234 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
235 break;
236 case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
237 if (skb->len != 1) {
238 status = NFC_HCI_ANY_E_NOK;
239 goto exit;
240 }
241 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
242
243 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
244 break;
245 default:
246 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
247 break;
248 }
249
250 if (hdev->ops->cmd_received)
251 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
252
253exit:
254 nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
255 status, NULL, 0, NULL, NULL, 0);
256
257 kfree_skb(skb);
258}
259
260u32 nfc_hci_sak_to_protocol(u8 sak)
261{
262 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
263 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
264 return NFC_PROTO_MIFARE_MASK;
265 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
266 return NFC_PROTO_ISO14443_MASK;
267 case NFC_HCI_TYPE_A_SEL_PROT_DEP:
268 return NFC_PROTO_NFC_DEP_MASK;
269 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
270 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
271 default:
272 return 0xffffffff;
273 }
274}
275EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
276
277int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
278{
279 struct nfc_target *targets;
280 struct sk_buff *atqa_skb = NULL;
281 struct sk_buff *sak_skb = NULL;
282 struct sk_buff *uid_skb = NULL;
283 int r;
284
285 pr_debug("from gate %d\n", gate);
286
287 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
288 if (targets == NULL)
289 return -ENOMEM;
290
291 switch (gate) {
292 case NFC_HCI_RF_READER_A_GATE:
293 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
294 NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
295 if (r < 0)
296 goto exit;
297
298 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
299 NFC_HCI_RF_READER_A_SAK, &sak_skb);
300 if (r < 0)
301 goto exit;
302
303 if (atqa_skb->len != 2 || sak_skb->len != 1) {
304 r = -EPROTO;
305 goto exit;
306 }
307
308 targets->supported_protocols =
309 nfc_hci_sak_to_protocol(sak_skb->data[0]);
310 if (targets->supported_protocols == 0xffffffff) {
311 r = -EPROTO;
312 goto exit;
313 }
314
315 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
316 targets->sel_res = sak_skb->data[0];
317
318 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
319 NFC_HCI_RF_READER_A_UID, &uid_skb);
320 if (r < 0)
321 goto exit;
322
323 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
324 r = -EPROTO;
325 goto exit;
326 }
327
328 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
329 targets->nfcid1_len = uid_skb->len;
330
331 if (hdev->ops->complete_target_discovered) {
332 r = hdev->ops->complete_target_discovered(hdev, gate,
333 targets);
334 if (r < 0)
335 goto exit;
336 }
337 break;
338 case NFC_HCI_RF_READER_B_GATE:
339 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
340 break;
341 default:
342 if (hdev->ops->target_from_gate)
343 r = hdev->ops->target_from_gate(hdev, gate, targets);
344 else
345 r = -EPROTO;
346 if (r < 0)
347 goto exit;
348
349 if (hdev->ops->complete_target_discovered) {
350 r = hdev->ops->complete_target_discovered(hdev, gate,
351 targets);
352 if (r < 0)
353 goto exit;
354 }
355 break;
356 }
357
358 /* if driver set the new gate, we will skip the old one */
359 if (targets->hci_reader_gate == 0x00)
360 targets->hci_reader_gate = gate;
361
362 r = nfc_targets_found(hdev->ndev, targets, 1);
363
364exit:
365 kfree(targets);
366 kfree_skb(atqa_skb);
367 kfree_skb(sak_skb);
368 kfree_skb(uid_skb);
369
370 return r;
371}
372EXPORT_SYMBOL(nfc_hci_target_discovered);
373
374void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
375 struct sk_buff *skb)
376{
377 int r = 0;
378 u8 gate = hdev->pipes[pipe].gate;
379
380 if (gate == NFC_HCI_INVALID_GATE) {
381 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
382 goto exit;
383 }
384
385 if (hdev->ops->event_received) {
386 r = hdev->ops->event_received(hdev, pipe, event, skb);
387 if (r <= 0)
388 goto exit_noskb;
389 }
390
391 switch (event) {
392 case NFC_HCI_EVT_TARGET_DISCOVERED:
393 if (skb->len < 1) { /* no status data? */
394 r = -EPROTO;
395 goto exit;
396 }
397
398 if (skb->data[0] == 3) {
399 /* TODO: Multiple targets in field, none activated
400 * poll is supposedly stopped, but there is no
401 * single target to activate, so nothing to report
402 * up.
403 * if we need to restart poll, we must save the
404 * protocols from the initial poll and reuse here.
405 */
406 }
407
408 if (skb->data[0] != 0) {
409 r = -EPROTO;
410 goto exit;
411 }
412
413 r = nfc_hci_target_discovered(hdev, gate);
414 break;
415 default:
416 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
417 r = -EINVAL;
418 break;
419 }
420
421exit:
422 kfree_skb(skb);
423
424exit_noskb:
425 if (r)
426 nfc_hci_driver_failure(hdev, r);
427}
428
429static void nfc_hci_cmd_timeout(struct timer_list *t)
430{
431 struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
432
433 schedule_work(&hdev->msg_tx_work);
434}
435
436static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
437 struct nfc_hci_gate *gates)
438{
439 int r;
440 while (gate_count--) {
441 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
442 gates->gate, gates->pipe);
443 if (r < 0)
444 return r;
445 gates++;
446 }
447
448 return 0;
449}
450
451static int hci_dev_session_init(struct nfc_hci_dev *hdev)
452{
453 struct sk_buff *skb = NULL;
454 int r;
455
456 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
457 return -EPROTO;
458
459 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
460 hdev->init_data.gates[0].gate,
461 hdev->init_data.gates[0].pipe);
462 if (r < 0)
463 goto exit;
464
465 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
466 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
467 if (r < 0)
468 goto disconnect_all;
469
470 if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
471 (memcmp(hdev->init_data.session_id, skb->data,
472 skb->len) == 0) && hdev->ops->load_session) {
473 /* Restore gate<->pipe table from some proprietary location. */
474
475 r = hdev->ops->load_session(hdev);
476
477 if (r < 0)
478 goto disconnect_all;
479 } else {
480
481 r = nfc_hci_disconnect_all_gates(hdev);
482 if (r < 0)
483 goto exit;
484
485 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
486 hdev->init_data.gates);
487 if (r < 0)
488 goto disconnect_all;
489
490 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
491 NFC_HCI_ADMIN_SESSION_IDENTITY,
492 hdev->init_data.session_id,
493 strlen(hdev->init_data.session_id));
494 }
495 if (r == 0)
496 goto exit;
497
498disconnect_all:
499 nfc_hci_disconnect_all_gates(hdev);
500
501exit:
502 kfree_skb(skb);
503
504 return r;
505}
506
507static int hci_dev_version(struct nfc_hci_dev *hdev)
508{
509 int r;
510 struct sk_buff *skb;
511
512 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
513 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
514 if (r == -EOPNOTSUPP) {
515 pr_info("Software/Hardware info not available\n");
516 return 0;
517 }
518 if (r < 0)
519 return r;
520
521 if (skb->len != 3) {
522 kfree_skb(skb);
523 return -EINVAL;
524 }
525
526 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
527 hdev->sw_patch = skb->data[0] & 0x0f;
528 hdev->sw_flashlib_major = skb->data[1];
529 hdev->sw_flashlib_minor = skb->data[2];
530
531 kfree_skb(skb);
532
533 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
534 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
535 if (r < 0)
536 return r;
537
538 if (skb->len != 3) {
539 kfree_skb(skb);
540 return -EINVAL;
541 }
542
543 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
544 hdev->hw_version = skb->data[0] & 0x1f;
545 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
546 hdev->hw_software = skb->data[1] & 0x3f;
547 hdev->hw_bsid = skb->data[2];
548
549 kfree_skb(skb);
550
551 pr_info("SOFTWARE INFO:\n");
552 pr_info("RomLib : %d\n", hdev->sw_romlib);
553 pr_info("Patch : %d\n", hdev->sw_patch);
554 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
555 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
556 pr_info("HARDWARE INFO:\n");
557 pr_info("Derivative : %d\n", hdev->hw_derivative);
558 pr_info("HW Version : %d\n", hdev->hw_version);
559 pr_info("#MPW : %d\n", hdev->hw_mpw);
560 pr_info("Software : %d\n", hdev->hw_software);
561 pr_info("BSID Version : %d\n", hdev->hw_bsid);
562
563 return 0;
564}
565
566static int hci_dev_up(struct nfc_dev *nfc_dev)
567{
568 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
569 int r = 0;
570
571 if (hdev->ops->open) {
572 r = hdev->ops->open(hdev);
573 if (r < 0)
574 return r;
575 }
576
577 r = nfc_llc_start(hdev->llc);
578 if (r < 0)
579 goto exit_close;
580
581 r = hci_dev_session_init(hdev);
582 if (r < 0)
583 goto exit_llc;
584
585 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
586 NFC_HCI_EVT_END_OPERATION, NULL, 0);
587 if (r < 0)
588 goto exit_llc;
589
590 if (hdev->ops->hci_ready) {
591 r = hdev->ops->hci_ready(hdev);
592 if (r < 0)
593 goto exit_llc;
594 }
595
596 r = hci_dev_version(hdev);
597 if (r < 0)
598 goto exit_llc;
599
600 return 0;
601
602exit_llc:
603 nfc_llc_stop(hdev->llc);
604
605exit_close:
606 if (hdev->ops->close)
607 hdev->ops->close(hdev);
608
609 return r;
610}
611
612static int hci_dev_down(struct nfc_dev *nfc_dev)
613{
614 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
615
616 nfc_llc_stop(hdev->llc);
617
618 if (hdev->ops->close)
619 hdev->ops->close(hdev);
620
621 nfc_hci_reset_pipes(hdev);
622
623 return 0;
624}
625
626static int hci_start_poll(struct nfc_dev *nfc_dev,
627 u32 im_protocols, u32 tm_protocols)
628{
629 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
630
631 if (hdev->ops->start_poll)
632 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
633 else
634 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
635 NFC_HCI_EVT_READER_REQUESTED,
636 NULL, 0);
637}
638
639static void hci_stop_poll(struct nfc_dev *nfc_dev)
640{
641 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
642
643 if (hdev->ops->stop_poll)
644 hdev->ops->stop_poll(hdev);
645 else
646 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
647 NFC_HCI_EVT_END_OPERATION, NULL, 0);
648}
649
650static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
651 __u8 comm_mode, __u8 *gb, size_t gb_len)
652{
653 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
654
655 if (!hdev->ops->dep_link_up)
656 return 0;
657
658 return hdev->ops->dep_link_up(hdev, target, comm_mode,
659 gb, gb_len);
660}
661
662static int hci_dep_link_down(struct nfc_dev *nfc_dev)
663{
664 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
665
666 if (!hdev->ops->dep_link_down)
667 return 0;
668
669 return hdev->ops->dep_link_down(hdev);
670}
671
672static int hci_activate_target(struct nfc_dev *nfc_dev,
673 struct nfc_target *target, u32 protocol)
674{
675 return 0;
676}
677
678static void hci_deactivate_target(struct nfc_dev *nfc_dev,
679 struct nfc_target *target,
680 u8 mode)
681{
682}
683
684#define HCI_CB_TYPE_TRANSCEIVE 1
685
686static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
687{
688 struct nfc_hci_dev *hdev = context;
689
690 switch (hdev->async_cb_type) {
691 case HCI_CB_TYPE_TRANSCEIVE:
692 /*
693 * TODO: Check RF Error indicator to make sure data is valid.
694 * It seems that HCI cmd can complete without error, but data
695 * can be invalid if an RF error occured? Ignore for now.
696 */
697 if (err == 0)
698 skb_trim(skb, skb->len - 1); /* RF Err ind */
699
700 hdev->async_cb(hdev->async_cb_context, skb, err);
701 break;
702 default:
703 if (err == 0)
704 kfree_skb(skb);
705 break;
706 }
707}
708
709static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
710 struct sk_buff *skb, data_exchange_cb_t cb,
711 void *cb_context)
712{
713 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
714 int r;
715
716 pr_debug("target_idx=%d\n", target->idx);
717
718 switch (target->hci_reader_gate) {
719 case NFC_HCI_RF_READER_A_GATE:
720 case NFC_HCI_RF_READER_B_GATE:
721 if (hdev->ops->im_transceive) {
722 r = hdev->ops->im_transceive(hdev, target, skb, cb,
723 cb_context);
724 if (r <= 0) /* handled */
725 break;
726 }
727
728 *(u8 *)skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
729
730 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
731 hdev->async_cb = cb;
732 hdev->async_cb_context = cb_context;
733
734 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
735 NFC_HCI_WR_XCHG_DATA, skb->data,
736 skb->len, hci_transceive_cb, hdev);
737 break;
738 default:
739 if (hdev->ops->im_transceive) {
740 r = hdev->ops->im_transceive(hdev, target, skb, cb,
741 cb_context);
742 if (r == 1)
743 r = -ENOTSUPP;
744 } else {
745 r = -ENOTSUPP;
746 }
747 break;
748 }
749
750 kfree_skb(skb);
751
752 return r;
753}
754
755static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
756{
757 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
758
759 if (!hdev->ops->tm_send) {
760 kfree_skb(skb);
761 return -ENOTSUPP;
762 }
763
764 return hdev->ops->tm_send(hdev, skb);
765}
766
767static int hci_check_presence(struct nfc_dev *nfc_dev,
768 struct nfc_target *target)
769{
770 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
771
772 if (!hdev->ops->check_presence)
773 return 0;
774
775 return hdev->ops->check_presence(hdev, target);
776}
777
778static int hci_discover_se(struct nfc_dev *nfc_dev)
779{
780 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
781
782 if (hdev->ops->discover_se)
783 return hdev->ops->discover_se(hdev);
784
785 return 0;
786}
787
788static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
789{
790 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
791
792 if (hdev->ops->enable_se)
793 return hdev->ops->enable_se(hdev, se_idx);
794
795 return 0;
796}
797
798static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
799{
800 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
801
802 if (hdev->ops->disable_se)
803 return hdev->ops->disable_se(hdev, se_idx);
804
805 return 0;
806}
807
808static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
809 u8 *apdu, size_t apdu_length,
810 se_io_cb_t cb, void *cb_context)
811{
812 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
813
814 if (hdev->ops->se_io)
815 return hdev->ops->se_io(hdev, se_idx, apdu,
816 apdu_length, cb, cb_context);
817
818 return 0;
819}
820
821static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
822{
823 mutex_lock(&hdev->msg_tx_mutex);
824
825 if (hdev->cmd_pending_msg == NULL) {
826 nfc_driver_failure(hdev->ndev, err);
827 goto exit;
828 }
829
830 __nfc_hci_cmd_completion(hdev, err, NULL);
831
832exit:
833 mutex_unlock(&hdev->msg_tx_mutex);
834}
835
836static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
837{
838 nfc_hci_failure(hdev, err);
839}
840
841static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
842{
843 struct hcp_packet *packet;
844 u8 type;
845 u8 instruction;
846 struct sk_buff *hcp_skb;
847 u8 pipe;
848 struct sk_buff *frag_skb;
849 int msg_len;
850
851 packet = (struct hcp_packet *)skb->data;
852 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
853 skb_queue_tail(&hdev->rx_hcp_frags, skb);
854 return;
855 }
856
857 /* it's the last fragment. Does it need re-aggregation? */
858 if (skb_queue_len(&hdev->rx_hcp_frags)) {
859 pipe = packet->header & NFC_HCI_FRAGMENT;
860 skb_queue_tail(&hdev->rx_hcp_frags, skb);
861
862 msg_len = 0;
863 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
864 msg_len += (frag_skb->len -
865 NFC_HCI_HCP_PACKET_HEADER_LEN);
866 }
867
868 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
869 msg_len, GFP_KERNEL);
870 if (hcp_skb == NULL) {
871 nfc_hci_failure(hdev, -ENOMEM);
872 return;
873 }
874
875 skb_put_u8(hcp_skb, pipe);
876
877 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
878 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
879 skb_put_data(hcp_skb,
880 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
881 msg_len);
882 }
883
884 skb_queue_purge(&hdev->rx_hcp_frags);
885 } else {
886 packet->header &= NFC_HCI_FRAGMENT;
887 hcp_skb = skb;
888 }
889
890 /* if this is a response, dispatch immediately to
891 * unblock waiting cmd context. Otherwise, enqueue to dispatch
892 * in separate context where handler can also execute command.
893 */
894 packet = (struct hcp_packet *)hcp_skb->data;
895 type = HCP_MSG_GET_TYPE(packet->message.header);
896 if (type == NFC_HCI_HCP_RESPONSE) {
897 pipe = packet->header;
898 instruction = HCP_MSG_GET_CMD(packet->message.header);
899 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
900 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
901 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
902 } else {
903 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
904 schedule_work(&hdev->msg_rx_work);
905 }
906}
907
908static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
909{
910 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
911
912 if (!hdev->ops->fw_download)
913 return -ENOTSUPP;
914
915 return hdev->ops->fw_download(hdev, firmware_name);
916}
917
918static struct nfc_ops hci_nfc_ops = {
919 .dev_up = hci_dev_up,
920 .dev_down = hci_dev_down,
921 .start_poll = hci_start_poll,
922 .stop_poll = hci_stop_poll,
923 .dep_link_up = hci_dep_link_up,
924 .dep_link_down = hci_dep_link_down,
925 .activate_target = hci_activate_target,
926 .deactivate_target = hci_deactivate_target,
927 .im_transceive = hci_transceive,
928 .tm_send = hci_tm_send,
929 .check_presence = hci_check_presence,
930 .fw_download = hci_fw_download,
931 .discover_se = hci_discover_se,
932 .enable_se = hci_enable_se,
933 .disable_se = hci_disable_se,
934 .se_io = hci_se_io,
935};
936
937struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
938 struct nfc_hci_init_data *init_data,
939 unsigned long quirks,
940 u32 protocols,
941 const char *llc_name,
942 int tx_headroom,
943 int tx_tailroom,
944 int max_link_payload)
945{
946 struct nfc_hci_dev *hdev;
947
948 if (ops->xmit == NULL)
949 return NULL;
950
951 if (protocols == 0)
952 return NULL;
953
954 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
955 if (hdev == NULL)
956 return NULL;
957
958 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
959 nfc_hci_recv_from_llc, tx_headroom,
960 tx_tailroom, nfc_hci_llc_failure);
961 if (hdev->llc == NULL) {
962 kfree(hdev);
963 return NULL;
964 }
965
966 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
967 tx_headroom + HCI_CMDS_HEADROOM,
968 tx_tailroom);
969 if (!hdev->ndev) {
970 nfc_llc_free(hdev->llc);
971 kfree(hdev);
972 return NULL;
973 }
974
975 hdev->ops = ops;
976 hdev->max_data_link_payload = max_link_payload;
977 hdev->init_data = *init_data;
978
979 nfc_set_drvdata(hdev->ndev, hdev);
980
981 nfc_hci_reset_pipes(hdev);
982
983 hdev->quirks = quirks;
984
985 return hdev;
986}
987EXPORT_SYMBOL(nfc_hci_allocate_device);
988
989void nfc_hci_free_device(struct nfc_hci_dev *hdev)
990{
991 nfc_free_device(hdev->ndev);
992 nfc_llc_free(hdev->llc);
993 kfree(hdev);
994}
995EXPORT_SYMBOL(nfc_hci_free_device);
996
997int nfc_hci_register_device(struct nfc_hci_dev *hdev)
998{
999 mutex_init(&hdev->msg_tx_mutex);
1000
1001 INIT_LIST_HEAD(&hdev->msg_tx_queue);
1002
1003 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1004
1005 timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
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}
1015EXPORT_SYMBOL(nfc_hci_register_device);
1016
1017void 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}
1052EXPORT_SYMBOL(nfc_hci_unregister_device);
1053
1054void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1055{
1056 hdev->clientdata = clientdata;
1057}
1058EXPORT_SYMBOL(nfc_hci_set_clientdata);
1059
1060void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1061{
1062 return hdev->clientdata;
1063}
1064EXPORT_SYMBOL(nfc_hci_get_clientdata);
1065
1066void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1067{
1068 nfc_hci_failure(hdev, err);
1069}
1070EXPORT_SYMBOL(nfc_hci_driver_failure);
1071
1072void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1073{
1074 nfc_llc_rcv_from_drv(hdev->llc, skb);
1075}
1076EXPORT_SYMBOL(nfc_hci_recv_frame);
1077
1078static int __init nfc_hci_init(void)
1079{
1080 return nfc_llc_init();
1081}
1082
1083static void __exit nfc_hci_exit(void)
1084{
1085 nfc_llc_exit();
1086}
1087
1088subsys_initcall(nfc_hci_init);
1089module_exit(nfc_hci_exit);
1090
1091MODULE_LICENSE("GPL");
1092MODULE_DESCRIPTION("NFC HCI Core");