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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");