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
nfc_hci_result_to_errno(u8 result)34 int nfc_hci_result_to_errno(u8 result)
35 {
36 switch (result) {
37 case NFC_HCI_ANY_OK:
38 return 0;
39 case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
40 return -EOPNOTSUPP;
41 case NFC_HCI_ANY_E_TIMEOUT:
42 return -ETIME;
43 default:
44 return -1;
45 }
46 }
47 EXPORT_SYMBOL(nfc_hci_result_to_errno);
48
nfc_hci_reset_pipes(struct nfc_hci_dev * hdev)49 void nfc_hci_reset_pipes(struct nfc_hci_dev *hdev)
50 {
51 int i = 0;
52
53 for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
54 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
55 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
56 }
57 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
58 }
59 EXPORT_SYMBOL(nfc_hci_reset_pipes);
60
nfc_hci_reset_pipes_per_host(struct nfc_hci_dev * hdev,u8 host)61 void nfc_hci_reset_pipes_per_host(struct nfc_hci_dev *hdev, u8 host)
62 {
63 int i = 0;
64
65 for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
66 if (hdev->pipes[i].dest_host != host)
67 continue;
68
69 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
70 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
71 }
72 }
73 EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
74
nfc_hci_msg_tx_work(struct work_struct * work)75 static void nfc_hci_msg_tx_work(struct work_struct *work)
76 {
77 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
78 msg_tx_work);
79 struct hci_msg *msg;
80 struct sk_buff *skb;
81 int r = 0;
82
83 mutex_lock(&hdev->msg_tx_mutex);
84 if (hdev->shutting_down)
85 goto exit;
86
87 if (hdev->cmd_pending_msg) {
88 if (timer_pending(&hdev->cmd_timer) == 0) {
89 if (hdev->cmd_pending_msg->cb)
90 hdev->cmd_pending_msg->cb(hdev->
91 cmd_pending_msg->
92 cb_context,
93 NULL,
94 -ETIME);
95 kfree(hdev->cmd_pending_msg);
96 hdev->cmd_pending_msg = NULL;
97 } else {
98 goto exit;
99 }
100 }
101
102 next_msg:
103 if (list_empty(&hdev->msg_tx_queue))
104 goto exit;
105
106 msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
107 list_del(&msg->msg_l);
108
109 pr_debug("msg_tx_queue has a cmd to send\n");
110 while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
111 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
112 if (r < 0) {
113 kfree_skb(skb);
114 skb_queue_purge(&msg->msg_frags);
115 if (msg->cb)
116 msg->cb(msg->cb_context, NULL, r);
117 kfree(msg);
118 break;
119 }
120 }
121
122 if (r)
123 goto next_msg;
124
125 if (msg->wait_response == false) {
126 kfree(msg);
127 goto next_msg;
128 }
129
130 hdev->cmd_pending_msg = msg;
131 mod_timer(&hdev->cmd_timer, jiffies +
132 msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
133
134 exit:
135 mutex_unlock(&hdev->msg_tx_mutex);
136 }
137
nfc_hci_msg_rx_work(struct work_struct * work)138 static void nfc_hci_msg_rx_work(struct work_struct *work)
139 {
140 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
141 msg_rx_work);
142 struct sk_buff *skb;
143 struct hcp_message *message;
144 u8 pipe;
145 u8 type;
146 u8 instruction;
147
148 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
149 pipe = skb->data[0];
150 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
151 message = (struct hcp_message *)skb->data;
152 type = HCP_MSG_GET_TYPE(message->header);
153 instruction = HCP_MSG_GET_CMD(message->header);
154 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
155
156 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
157 }
158 }
159
__nfc_hci_cmd_completion(struct nfc_hci_dev * hdev,int err,struct sk_buff * skb)160 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
161 struct sk_buff *skb)
162 {
163 del_timer_sync(&hdev->cmd_timer);
164
165 if (hdev->cmd_pending_msg->cb)
166 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
167 skb, err);
168 else
169 kfree_skb(skb);
170
171 kfree(hdev->cmd_pending_msg);
172 hdev->cmd_pending_msg = NULL;
173
174 schedule_work(&hdev->msg_tx_work);
175 }
176
nfc_hci_resp_received(struct nfc_hci_dev * hdev,u8 result,struct sk_buff * skb)177 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
178 struct sk_buff *skb)
179 {
180 mutex_lock(&hdev->msg_tx_mutex);
181
182 if (hdev->cmd_pending_msg == NULL) {
183 kfree_skb(skb);
184 goto exit;
185 }
186
187 __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
188
189 exit:
190 mutex_unlock(&hdev->msg_tx_mutex);
191 }
192
nfc_hci_cmd_received(struct nfc_hci_dev * hdev,u8 pipe,u8 cmd,struct sk_buff * skb)193 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
194 struct sk_buff *skb)
195 {
196 u8 status = NFC_HCI_ANY_OK;
197 struct hci_create_pipe_resp *create_info;
198 struct hci_delete_pipe_noti *delete_info;
199 struct hci_all_pipe_cleared_noti *cleared_info;
200 u8 gate;
201
202 pr_debug("from pipe %x cmd %x\n", pipe, cmd);
203
204 if (pipe >= NFC_HCI_MAX_PIPES) {
205 status = NFC_HCI_ANY_E_NOK;
206 goto exit;
207 }
208
209 gate = hdev->pipes[pipe].gate;
210
211 switch (cmd) {
212 case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
213 if (skb->len != 5) {
214 status = NFC_HCI_ANY_E_NOK;
215 goto exit;
216 }
217 create_info = (struct hci_create_pipe_resp *)skb->data;
218
219 if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
220 status = NFC_HCI_ANY_E_NOK;
221 goto exit;
222 }
223
224 /* Save the new created pipe and bind with local gate,
225 * the description for skb->data[3] is destination gate id
226 * but since we received this cmd from host controller, we
227 * are the destination and it is our local gate
228 */
229 hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
230 hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
231 hdev->pipes[create_info->pipe].dest_host =
232 create_info->src_host;
233 break;
234 case NFC_HCI_ANY_OPEN_PIPE:
235 if (gate == NFC_HCI_INVALID_GATE) {
236 status = NFC_HCI_ANY_E_NOK;
237 goto exit;
238 }
239 break;
240 case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
241 if (skb->len != 1) {
242 status = NFC_HCI_ANY_E_NOK;
243 goto exit;
244 }
245 delete_info = (struct hci_delete_pipe_noti *)skb->data;
246
247 if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
248 status = NFC_HCI_ANY_E_NOK;
249 goto exit;
250 }
251
252 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
253 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
254 break;
255 case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
256 if (skb->len != 1) {
257 status = NFC_HCI_ANY_E_NOK;
258 goto exit;
259 }
260 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
261
262 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
263 break;
264 default:
265 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
266 break;
267 }
268
269 if (hdev->ops->cmd_received)
270 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
271
272 exit:
273 nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
274 status, NULL, 0, NULL, NULL, 0);
275
276 kfree_skb(skb);
277 }
278
nfc_hci_sak_to_protocol(u8 sak)279 u32 nfc_hci_sak_to_protocol(u8 sak)
280 {
281 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
282 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
283 return NFC_PROTO_MIFARE_MASK;
284 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
285 return NFC_PROTO_ISO14443_MASK;
286 case NFC_HCI_TYPE_A_SEL_PROT_DEP:
287 return NFC_PROTO_NFC_DEP_MASK;
288 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
289 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
290 default:
291 return 0xffffffff;
292 }
293 }
294 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
295
nfc_hci_target_discovered(struct nfc_hci_dev * hdev,u8 gate)296 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
297 {
298 struct nfc_target *targets;
299 struct sk_buff *atqa_skb = NULL;
300 struct sk_buff *sak_skb = NULL;
301 struct sk_buff *uid_skb = NULL;
302 int r;
303
304 pr_debug("from gate %d\n", gate);
305
306 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
307 if (targets == NULL)
308 return -ENOMEM;
309
310 switch (gate) {
311 case NFC_HCI_RF_READER_A_GATE:
312 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
313 NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
314 if (r < 0)
315 goto exit;
316
317 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
318 NFC_HCI_RF_READER_A_SAK, &sak_skb);
319 if (r < 0)
320 goto exit;
321
322 if (atqa_skb->len != 2 || sak_skb->len != 1) {
323 r = -EPROTO;
324 goto exit;
325 }
326
327 targets->supported_protocols =
328 nfc_hci_sak_to_protocol(sak_skb->data[0]);
329 if (targets->supported_protocols == 0xffffffff) {
330 r = -EPROTO;
331 goto exit;
332 }
333
334 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
335 targets->sel_res = sak_skb->data[0];
336
337 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
338 NFC_HCI_RF_READER_A_UID, &uid_skb);
339 if (r < 0)
340 goto exit;
341
342 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
343 r = -EPROTO;
344 goto exit;
345 }
346
347 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
348 targets->nfcid1_len = uid_skb->len;
349
350 if (hdev->ops->complete_target_discovered) {
351 r = hdev->ops->complete_target_discovered(hdev, gate,
352 targets);
353 if (r < 0)
354 goto exit;
355 }
356 break;
357 case NFC_HCI_RF_READER_B_GATE:
358 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
359 break;
360 default:
361 if (hdev->ops->target_from_gate)
362 r = hdev->ops->target_from_gate(hdev, gate, targets);
363 else
364 r = -EPROTO;
365 if (r < 0)
366 goto exit;
367
368 if (hdev->ops->complete_target_discovered) {
369 r = hdev->ops->complete_target_discovered(hdev, gate,
370 targets);
371 if (r < 0)
372 goto exit;
373 }
374 break;
375 }
376
377 /* if driver set the new gate, we will skip the old one */
378 if (targets->hci_reader_gate == 0x00)
379 targets->hci_reader_gate = gate;
380
381 r = nfc_targets_found(hdev->ndev, targets, 1);
382
383 exit:
384 kfree(targets);
385 kfree_skb(atqa_skb);
386 kfree_skb(sak_skb);
387 kfree_skb(uid_skb);
388
389 return r;
390 }
391 EXPORT_SYMBOL(nfc_hci_target_discovered);
392
nfc_hci_event_received(struct nfc_hci_dev * hdev,u8 pipe,u8 event,struct sk_buff * skb)393 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
394 struct sk_buff *skb)
395 {
396 int r = 0;
397 u8 gate;
398
399 if (pipe >= NFC_HCI_MAX_PIPES) {
400 pr_err("Discarded event %x to invalid pipe %x\n", event, pipe);
401 goto exit;
402 }
403
404 gate = hdev->pipes[pipe].gate;
405 if (gate == NFC_HCI_INVALID_GATE) {
406 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
407 goto exit;
408 }
409
410 if (hdev->ops->event_received) {
411 r = hdev->ops->event_received(hdev, pipe, event, skb);
412 if (r <= 0)
413 goto exit_noskb;
414 }
415
416 switch (event) {
417 case NFC_HCI_EVT_TARGET_DISCOVERED:
418 if (skb->len < 1) { /* no status data? */
419 r = -EPROTO;
420 goto exit;
421 }
422
423 if (skb->data[0] == 3) {
424 /* TODO: Multiple targets in field, none activated
425 * poll is supposedly stopped, but there is no
426 * single target to activate, so nothing to report
427 * up.
428 * if we need to restart poll, we must save the
429 * protocols from the initial poll and reuse here.
430 */
431 }
432
433 if (skb->data[0] != 0) {
434 r = -EPROTO;
435 goto exit;
436 }
437
438 r = nfc_hci_target_discovered(hdev, gate);
439 break;
440 default:
441 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
442 r = -EINVAL;
443 break;
444 }
445
446 exit:
447 kfree_skb(skb);
448
449 exit_noskb:
450 if (r)
451 nfc_hci_driver_failure(hdev, r);
452 }
453
nfc_hci_cmd_timeout(unsigned long data)454 static void nfc_hci_cmd_timeout(unsigned long data)
455 {
456 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
457
458 schedule_work(&hdev->msg_tx_work);
459 }
460
hci_dev_connect_gates(struct nfc_hci_dev * hdev,u8 gate_count,struct nfc_hci_gate * gates)461 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
462 struct nfc_hci_gate *gates)
463 {
464 int r;
465 while (gate_count--) {
466 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
467 gates->gate, gates->pipe);
468 if (r < 0)
469 return r;
470 gates++;
471 }
472
473 return 0;
474 }
475
hci_dev_session_init(struct nfc_hci_dev * hdev)476 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
477 {
478 struct sk_buff *skb = NULL;
479 int r;
480
481 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
482 return -EPROTO;
483
484 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
485 hdev->init_data.gates[0].gate,
486 hdev->init_data.gates[0].pipe);
487 if (r < 0)
488 goto exit;
489
490 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
491 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
492 if (r < 0)
493 goto disconnect_all;
494
495 if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
496 (memcmp(hdev->init_data.session_id, skb->data,
497 skb->len) == 0) && hdev->ops->load_session) {
498 /* Restore gate<->pipe table from some proprietary location. */
499
500 r = hdev->ops->load_session(hdev);
501
502 if (r < 0)
503 goto disconnect_all;
504 } else {
505
506 r = nfc_hci_disconnect_all_gates(hdev);
507 if (r < 0)
508 goto exit;
509
510 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
511 hdev->init_data.gates);
512 if (r < 0)
513 goto disconnect_all;
514
515 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
516 NFC_HCI_ADMIN_SESSION_IDENTITY,
517 hdev->init_data.session_id,
518 strlen(hdev->init_data.session_id));
519 }
520 if (r == 0)
521 goto exit;
522
523 disconnect_all:
524 nfc_hci_disconnect_all_gates(hdev);
525
526 exit:
527 kfree_skb(skb);
528
529 return r;
530 }
531
hci_dev_version(struct nfc_hci_dev * hdev)532 static int hci_dev_version(struct nfc_hci_dev *hdev)
533 {
534 int r;
535 struct sk_buff *skb;
536
537 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
538 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
539 if (r == -EOPNOTSUPP) {
540 pr_info("Software/Hardware info not available\n");
541 return 0;
542 }
543 if (r < 0)
544 return r;
545
546 if (skb->len != 3) {
547 kfree_skb(skb);
548 return -EINVAL;
549 }
550
551 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
552 hdev->sw_patch = skb->data[0] & 0x0f;
553 hdev->sw_flashlib_major = skb->data[1];
554 hdev->sw_flashlib_minor = skb->data[2];
555
556 kfree_skb(skb);
557
558 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
559 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
560 if (r < 0)
561 return r;
562
563 if (skb->len != 3) {
564 kfree_skb(skb);
565 return -EINVAL;
566 }
567
568 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
569 hdev->hw_version = skb->data[0] & 0x1f;
570 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
571 hdev->hw_software = skb->data[1] & 0x3f;
572 hdev->hw_bsid = skb->data[2];
573
574 kfree_skb(skb);
575
576 pr_info("SOFTWARE INFO:\n");
577 pr_info("RomLib : %d\n", hdev->sw_romlib);
578 pr_info("Patch : %d\n", hdev->sw_patch);
579 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
580 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
581 pr_info("HARDWARE INFO:\n");
582 pr_info("Derivative : %d\n", hdev->hw_derivative);
583 pr_info("HW Version : %d\n", hdev->hw_version);
584 pr_info("#MPW : %d\n", hdev->hw_mpw);
585 pr_info("Software : %d\n", hdev->hw_software);
586 pr_info("BSID Version : %d\n", hdev->hw_bsid);
587
588 return 0;
589 }
590
hci_dev_up(struct nfc_dev * nfc_dev)591 static int hci_dev_up(struct nfc_dev *nfc_dev)
592 {
593 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
594 int r = 0;
595
596 if (hdev->ops->open) {
597 r = hdev->ops->open(hdev);
598 if (r < 0)
599 return r;
600 }
601
602 r = nfc_llc_start(hdev->llc);
603 if (r < 0)
604 goto exit_close;
605
606 r = hci_dev_session_init(hdev);
607 if (r < 0)
608 goto exit_llc;
609
610 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
611 NFC_HCI_EVT_END_OPERATION, NULL, 0);
612 if (r < 0)
613 goto exit_llc;
614
615 if (hdev->ops->hci_ready) {
616 r = hdev->ops->hci_ready(hdev);
617 if (r < 0)
618 goto exit_llc;
619 }
620
621 r = hci_dev_version(hdev);
622 if (r < 0)
623 goto exit_llc;
624
625 return 0;
626
627 exit_llc:
628 nfc_llc_stop(hdev->llc);
629
630 exit_close:
631 if (hdev->ops->close)
632 hdev->ops->close(hdev);
633
634 return r;
635 }
636
hci_dev_down(struct nfc_dev * nfc_dev)637 static int hci_dev_down(struct nfc_dev *nfc_dev)
638 {
639 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
640
641 nfc_llc_stop(hdev->llc);
642
643 if (hdev->ops->close)
644 hdev->ops->close(hdev);
645
646 nfc_hci_reset_pipes(hdev);
647
648 return 0;
649 }
650
hci_start_poll(struct nfc_dev * nfc_dev,u32 im_protocols,u32 tm_protocols)651 static int hci_start_poll(struct nfc_dev *nfc_dev,
652 u32 im_protocols, u32 tm_protocols)
653 {
654 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
655
656 if (hdev->ops->start_poll)
657 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
658 else
659 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
660 NFC_HCI_EVT_READER_REQUESTED,
661 NULL, 0);
662 }
663
hci_stop_poll(struct nfc_dev * nfc_dev)664 static void hci_stop_poll(struct nfc_dev *nfc_dev)
665 {
666 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
667
668 if (hdev->ops->stop_poll)
669 hdev->ops->stop_poll(hdev);
670 else
671 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
672 NFC_HCI_EVT_END_OPERATION, NULL, 0);
673 }
674
hci_dep_link_up(struct nfc_dev * nfc_dev,struct nfc_target * target,__u8 comm_mode,__u8 * gb,size_t gb_len)675 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
676 __u8 comm_mode, __u8 *gb, size_t gb_len)
677 {
678 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
679
680 if (!hdev->ops->dep_link_up)
681 return 0;
682
683 return hdev->ops->dep_link_up(hdev, target, comm_mode,
684 gb, gb_len);
685 }
686
hci_dep_link_down(struct nfc_dev * nfc_dev)687 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
688 {
689 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
690
691 if (!hdev->ops->dep_link_down)
692 return 0;
693
694 return hdev->ops->dep_link_down(hdev);
695 }
696
hci_activate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u32 protocol)697 static int hci_activate_target(struct nfc_dev *nfc_dev,
698 struct nfc_target *target, u32 protocol)
699 {
700 return 0;
701 }
702
hci_deactivate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u8 mode)703 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
704 struct nfc_target *target,
705 u8 mode)
706 {
707 }
708
709 #define HCI_CB_TYPE_TRANSCEIVE 1
710
hci_transceive_cb(void * context,struct sk_buff * skb,int err)711 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
712 {
713 struct nfc_hci_dev *hdev = context;
714
715 switch (hdev->async_cb_type) {
716 case HCI_CB_TYPE_TRANSCEIVE:
717 /*
718 * TODO: Check RF Error indicator to make sure data is valid.
719 * It seems that HCI cmd can complete without error, but data
720 * can be invalid if an RF error occured? Ignore for now.
721 */
722 if (err == 0)
723 skb_trim(skb, skb->len - 1); /* RF Err ind */
724
725 hdev->async_cb(hdev->async_cb_context, skb, err);
726 break;
727 default:
728 if (err == 0)
729 kfree_skb(skb);
730 break;
731 }
732 }
733
hci_transceive(struct nfc_dev * nfc_dev,struct nfc_target * target,struct sk_buff * skb,data_exchange_cb_t cb,void * cb_context)734 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
735 struct sk_buff *skb, data_exchange_cb_t cb,
736 void *cb_context)
737 {
738 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
739 int r;
740
741 pr_debug("target_idx=%d\n", target->idx);
742
743 switch (target->hci_reader_gate) {
744 case NFC_HCI_RF_READER_A_GATE:
745 case NFC_HCI_RF_READER_B_GATE:
746 if (hdev->ops->im_transceive) {
747 r = hdev->ops->im_transceive(hdev, target, skb, cb,
748 cb_context);
749 if (r <= 0) /* handled */
750 break;
751 }
752
753 *(u8 *)skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
754
755 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
756 hdev->async_cb = cb;
757 hdev->async_cb_context = cb_context;
758
759 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
760 NFC_HCI_WR_XCHG_DATA, skb->data,
761 skb->len, hci_transceive_cb, hdev);
762 break;
763 default:
764 if (hdev->ops->im_transceive) {
765 r = hdev->ops->im_transceive(hdev, target, skb, cb,
766 cb_context);
767 if (r == 1)
768 r = -ENOTSUPP;
769 } else {
770 r = -ENOTSUPP;
771 }
772 break;
773 }
774
775 kfree_skb(skb);
776
777 return r;
778 }
779
hci_tm_send(struct nfc_dev * nfc_dev,struct sk_buff * skb)780 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
781 {
782 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
783
784 if (!hdev->ops->tm_send) {
785 kfree_skb(skb);
786 return -ENOTSUPP;
787 }
788
789 return hdev->ops->tm_send(hdev, skb);
790 }
791
hci_check_presence(struct nfc_dev * nfc_dev,struct nfc_target * target)792 static int hci_check_presence(struct nfc_dev *nfc_dev,
793 struct nfc_target *target)
794 {
795 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
796
797 if (!hdev->ops->check_presence)
798 return 0;
799
800 return hdev->ops->check_presence(hdev, target);
801 }
802
hci_discover_se(struct nfc_dev * nfc_dev)803 static int hci_discover_se(struct nfc_dev *nfc_dev)
804 {
805 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
806
807 if (hdev->ops->discover_se)
808 return hdev->ops->discover_se(hdev);
809
810 return 0;
811 }
812
hci_enable_se(struct nfc_dev * nfc_dev,u32 se_idx)813 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
814 {
815 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
816
817 if (hdev->ops->enable_se)
818 return hdev->ops->enable_se(hdev, se_idx);
819
820 return 0;
821 }
822
hci_disable_se(struct nfc_dev * nfc_dev,u32 se_idx)823 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
824 {
825 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
826
827 if (hdev->ops->disable_se)
828 return hdev->ops->disable_se(hdev, se_idx);
829
830 return 0;
831 }
832
hci_se_io(struct nfc_dev * nfc_dev,u32 se_idx,u8 * apdu,size_t apdu_length,se_io_cb_t cb,void * cb_context)833 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
834 u8 *apdu, size_t apdu_length,
835 se_io_cb_t cb, void *cb_context)
836 {
837 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
838
839 if (hdev->ops->se_io)
840 return hdev->ops->se_io(hdev, se_idx, apdu,
841 apdu_length, cb, cb_context);
842
843 return 0;
844 }
845
nfc_hci_failure(struct nfc_hci_dev * hdev,int err)846 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
847 {
848 mutex_lock(&hdev->msg_tx_mutex);
849
850 if (hdev->cmd_pending_msg == NULL) {
851 nfc_driver_failure(hdev->ndev, err);
852 goto exit;
853 }
854
855 __nfc_hci_cmd_completion(hdev, err, NULL);
856
857 exit:
858 mutex_unlock(&hdev->msg_tx_mutex);
859 }
860
nfc_hci_llc_failure(struct nfc_hci_dev * hdev,int err)861 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
862 {
863 nfc_hci_failure(hdev, err);
864 }
865
nfc_hci_recv_from_llc(struct nfc_hci_dev * hdev,struct sk_buff * skb)866 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
867 {
868 struct hcp_packet *packet;
869 u8 type;
870 u8 instruction;
871 struct sk_buff *hcp_skb;
872 u8 pipe;
873 struct sk_buff *frag_skb;
874 int msg_len;
875
876 packet = (struct hcp_packet *)skb->data;
877 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
878 skb_queue_tail(&hdev->rx_hcp_frags, skb);
879 return;
880 }
881
882 /* it's the last fragment. Does it need re-aggregation? */
883 if (skb_queue_len(&hdev->rx_hcp_frags)) {
884 pipe = packet->header & NFC_HCI_FRAGMENT;
885 skb_queue_tail(&hdev->rx_hcp_frags, skb);
886
887 msg_len = 0;
888 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
889 msg_len += (frag_skb->len -
890 NFC_HCI_HCP_PACKET_HEADER_LEN);
891 }
892
893 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
894 msg_len, GFP_KERNEL);
895 if (hcp_skb == NULL) {
896 nfc_hci_failure(hdev, -ENOMEM);
897 return;
898 }
899
900 skb_put_u8(hcp_skb, pipe);
901
902 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
903 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
904 skb_put_data(hcp_skb,
905 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
906 msg_len);
907 }
908
909 skb_queue_purge(&hdev->rx_hcp_frags);
910 } else {
911 packet->header &= NFC_HCI_FRAGMENT;
912 hcp_skb = skb;
913 }
914
915 /* if this is a response, dispatch immediately to
916 * unblock waiting cmd context. Otherwise, enqueue to dispatch
917 * in separate context where handler can also execute command.
918 */
919 packet = (struct hcp_packet *)hcp_skb->data;
920 type = HCP_MSG_GET_TYPE(packet->message.header);
921 if (type == NFC_HCI_HCP_RESPONSE) {
922 pipe = packet->header;
923 instruction = HCP_MSG_GET_CMD(packet->message.header);
924 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
925 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
926 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
927 } else {
928 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
929 schedule_work(&hdev->msg_rx_work);
930 }
931 }
932
hci_fw_download(struct nfc_dev * nfc_dev,const char * firmware_name)933 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
934 {
935 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
936
937 if (!hdev->ops->fw_download)
938 return -ENOTSUPP;
939
940 return hdev->ops->fw_download(hdev, firmware_name);
941 }
942
943 static struct nfc_ops hci_nfc_ops = {
944 .dev_up = hci_dev_up,
945 .dev_down = hci_dev_down,
946 .start_poll = hci_start_poll,
947 .stop_poll = hci_stop_poll,
948 .dep_link_up = hci_dep_link_up,
949 .dep_link_down = hci_dep_link_down,
950 .activate_target = hci_activate_target,
951 .deactivate_target = hci_deactivate_target,
952 .im_transceive = hci_transceive,
953 .tm_send = hci_tm_send,
954 .check_presence = hci_check_presence,
955 .fw_download = hci_fw_download,
956 .discover_se = hci_discover_se,
957 .enable_se = hci_enable_se,
958 .disable_se = hci_disable_se,
959 .se_io = hci_se_io,
960 };
961
nfc_hci_allocate_device(struct nfc_hci_ops * ops,struct nfc_hci_init_data * init_data,unsigned long quirks,u32 protocols,const char * llc_name,int tx_headroom,int tx_tailroom,int max_link_payload)962 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
963 struct nfc_hci_init_data *init_data,
964 unsigned long quirks,
965 u32 protocols,
966 const char *llc_name,
967 int tx_headroom,
968 int tx_tailroom,
969 int max_link_payload)
970 {
971 struct nfc_hci_dev *hdev;
972
973 if (ops->xmit == NULL)
974 return NULL;
975
976 if (protocols == 0)
977 return NULL;
978
979 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
980 if (hdev == NULL)
981 return NULL;
982
983 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
984 nfc_hci_recv_from_llc, tx_headroom,
985 tx_tailroom, nfc_hci_llc_failure);
986 if (hdev->llc == NULL) {
987 kfree(hdev);
988 return NULL;
989 }
990
991 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
992 tx_headroom + HCI_CMDS_HEADROOM,
993 tx_tailroom);
994 if (!hdev->ndev) {
995 nfc_llc_free(hdev->llc);
996 kfree(hdev);
997 return NULL;
998 }
999
1000 hdev->ops = ops;
1001 hdev->max_data_link_payload = max_link_payload;
1002 hdev->init_data = *init_data;
1003
1004 nfc_set_drvdata(hdev->ndev, hdev);
1005
1006 nfc_hci_reset_pipes(hdev);
1007
1008 hdev->quirks = quirks;
1009
1010 return hdev;
1011 }
1012 EXPORT_SYMBOL(nfc_hci_allocate_device);
1013
nfc_hci_free_device(struct nfc_hci_dev * hdev)1014 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
1015 {
1016 nfc_free_device(hdev->ndev);
1017 nfc_llc_free(hdev->llc);
1018 kfree(hdev);
1019 }
1020 EXPORT_SYMBOL(nfc_hci_free_device);
1021
nfc_hci_register_device(struct nfc_hci_dev * hdev)1022 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
1023 {
1024 mutex_init(&hdev->msg_tx_mutex);
1025
1026 INIT_LIST_HEAD(&hdev->msg_tx_queue);
1027
1028 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1029
1030 init_timer(&hdev->cmd_timer);
1031 hdev->cmd_timer.data = (unsigned long)hdev;
1032 hdev->cmd_timer.function = nfc_hci_cmd_timeout;
1033
1034 skb_queue_head_init(&hdev->rx_hcp_frags);
1035
1036 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1037
1038 skb_queue_head_init(&hdev->msg_rx_queue);
1039
1040 return nfc_register_device(hdev->ndev);
1041 }
1042 EXPORT_SYMBOL(nfc_hci_register_device);
1043
nfc_hci_unregister_device(struct nfc_hci_dev * hdev)1044 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1045 {
1046 struct hci_msg *msg, *n;
1047
1048 mutex_lock(&hdev->msg_tx_mutex);
1049
1050 if (hdev->cmd_pending_msg) {
1051 if (hdev->cmd_pending_msg->cb)
1052 hdev->cmd_pending_msg->cb(
1053 hdev->cmd_pending_msg->cb_context,
1054 NULL, -ESHUTDOWN);
1055 kfree(hdev->cmd_pending_msg);
1056 hdev->cmd_pending_msg = NULL;
1057 }
1058
1059 hdev->shutting_down = true;
1060
1061 mutex_unlock(&hdev->msg_tx_mutex);
1062
1063 del_timer_sync(&hdev->cmd_timer);
1064 cancel_work_sync(&hdev->msg_tx_work);
1065
1066 cancel_work_sync(&hdev->msg_rx_work);
1067
1068 nfc_unregister_device(hdev->ndev);
1069
1070 skb_queue_purge(&hdev->rx_hcp_frags);
1071 skb_queue_purge(&hdev->msg_rx_queue);
1072
1073 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1074 list_del(&msg->msg_l);
1075 skb_queue_purge(&msg->msg_frags);
1076 kfree(msg);
1077 }
1078 }
1079 EXPORT_SYMBOL(nfc_hci_unregister_device);
1080
nfc_hci_set_clientdata(struct nfc_hci_dev * hdev,void * clientdata)1081 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1082 {
1083 hdev->clientdata = clientdata;
1084 }
1085 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1086
nfc_hci_get_clientdata(struct nfc_hci_dev * hdev)1087 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1088 {
1089 return hdev->clientdata;
1090 }
1091 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1092
nfc_hci_driver_failure(struct nfc_hci_dev * hdev,int err)1093 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1094 {
1095 nfc_hci_failure(hdev, err);
1096 }
1097 EXPORT_SYMBOL(nfc_hci_driver_failure);
1098
nfc_hci_recv_frame(struct nfc_hci_dev * hdev,struct sk_buff * skb)1099 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1100 {
1101 nfc_llc_rcv_from_drv(hdev->llc, skb);
1102 }
1103 EXPORT_SYMBOL(nfc_hci_recv_frame);
1104
nfc_hci_init(void)1105 static int __init nfc_hci_init(void)
1106 {
1107 return nfc_llc_init();
1108 }
1109
nfc_hci_exit(void)1110 static void __exit nfc_hci_exit(void)
1111 {
1112 nfc_llc_exit();
1113 }
1114
1115 subsys_initcall(nfc_hci_init);
1116 module_exit(nfc_hci_exit);
1117
1118 MODULE_LICENSE("GPL");
1119 MODULE_DESCRIPTION("NFC HCI Core");
1120