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Merge tag 'hwmon-for-v6.13-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux.git] / net / nfc / hci / core.c
blobceb87db57cdb332c1b5fdc709ab0e5388bba101e
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
22 int 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 }
35 EXPORT_SYMBOL(nfc_hci_result_to_errno);
36
37 void 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 }
47 EXPORT_SYMBOL(nfc_hci_reset_pipes);
48
49 void 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 }
61 EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
62
63 static 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
90 next_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
122 exit:
123 mutex_unlock(&hdev->msg_tx_mutex);
124 }
125
126 static 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
148 static 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
165 void 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
177 exit:
178 mutex_unlock(&hdev->msg_tx_mutex);
179 }
180
181 void 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
260 exit:
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
267 u32 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 }
282 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
283
284 int 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
371 exit:
372 kfree(targets);
373 kfree_skb(atqa_skb);
374 kfree_skb(sak_skb);
375 kfree_skb(uid_skb);
376
377 return r;
378 }
379 EXPORT_SYMBOL(nfc_hci_target_discovered);
380
381 void 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
434 exit:
435 kfree_skb(skb);
436
437 exit_noskb:
438 if (r)
439 nfc_hci_driver_failure(hdev, r);
440 }
441
442 static 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
449 static 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
464 static 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
511 disconnect_all:
512 nfc_hci_disconnect_all_gates(hdev);
513
514 exit:
515 kfree_skb(skb);
516
517 return r;
518 }
519
520 static 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
579 static 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
615 exit_llc:
616 nfc_llc_stop(hdev->llc);
617
618 exit_close:
619 if (hdev->ops->close)
620 hdev->ops->close(hdev);
621
622 return r;
623 }
624
625 static 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
639 static 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
652 static 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
663 static 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
675 static 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
685 static int hci_activate_target(struct nfc_dev *nfc_dev,
686 struct nfc_target *target, u32 protocol)
687 {
688 return 0;
689 }
690
691 static 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
699 static 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
722 static 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
768 static 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
780 static 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
791 static 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
801 static 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
811 static 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
821 static 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
834 static 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
845 exit:
846 mutex_unlock(&hdev->msg_tx_mutex);
847 }
848
849 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
850 {
851 nfc_hci_failure(hdev, err);
852 }
853
854 static 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
921 static 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
931 static 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
950 struct 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 }
1000 EXPORT_SYMBOL(nfc_hci_allocate_device);
1001
1002 void 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 }
1008 EXPORT_SYMBOL(nfc_hci_free_device);
1009
1010 int 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 }
1028 EXPORT_SYMBOL(nfc_hci_register_device);
1029
1030 void 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 }
1065 EXPORT_SYMBOL(nfc_hci_unregister_device);
1066
1067 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1068 {
1069 hdev->clientdata = clientdata;
1070 }
1071 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1072
1073 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1074 {
1075 return hdev->clientdata;
1076 }
1077 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1078
1079 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1080 {
1081 nfc_hci_failure(hdev, err);
1082 }
1083 EXPORT_SYMBOL(nfc_hci_driver_failure);
1084
1085 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1086 {
1087 nfc_llc_rcv_from_drv(hdev->llc, skb);
1088 }
1089 EXPORT_SYMBOL(nfc_hci_recv_frame);
1090
1091 static int __init nfc_hci_init(void)
1092 {
1093 return nfc_llc_init();
1094 }
1095
1096 static void __exit nfc_hci_exit(void)
1097 {
1098 nfc_llc_exit();
1099 }
1100
1101 subsys_initcall(nfc_hci_init);
1102 module_exit(nfc_hci_exit);
1103
1104 MODULE_LICENSE("GPL");
1105 MODULE_DESCRIPTION("NFC HCI Core");
Linux Kernel