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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
49void 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}
59EXPORT_SYMBOL(nfc_hci_reset_pipes);
60
61void 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}
73EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
74
75static 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
102next_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
134exit:
135 mutex_unlock(&hdev->msg_tx_mutex);
136}
137
138static 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
160static 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
177void 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
189exit:
190 mutex_unlock(&hdev->msg_tx_mutex);
191}
192
193void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
194 struct sk_buff *skb)
195{
196 u8 gate = hdev->pipes[pipe].gate;
197 u8 status = NFC_HCI_ANY_OK;
198 struct hci_create_pipe_resp *create_info;
199 struct hci_delete_pipe_noti *delete_info;
200 struct hci_all_pipe_cleared_noti *cleared_info;
201
202 pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
203
204 switch (cmd) {
205 case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
206 if (skb->len != 5) {
207 status = NFC_HCI_ANY_E_NOK;
208 goto exit;
209 }
210 create_info = (struct hci_create_pipe_resp *)skb->data;
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 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
236 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
237 break;
238 case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
239 if (skb->len != 1) {
240 status = NFC_HCI_ANY_E_NOK;
241 goto exit;
242 }
243 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
244
245 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
246 break;
247 default:
248 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
249 break;
250 }
251
252 if (hdev->ops->cmd_received)
253 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
254
255exit:
256 nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
257 status, NULL, 0, NULL, NULL, 0);
258
259 kfree_skb(skb);
260}
261
262u32 nfc_hci_sak_to_protocol(u8 sak)
263{
264 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
265 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
266 return NFC_PROTO_MIFARE_MASK;
267 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
268 return NFC_PROTO_ISO14443_MASK;
269 case NFC_HCI_TYPE_A_SEL_PROT_DEP:
270 return NFC_PROTO_NFC_DEP_MASK;
271 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
272 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
273 default:
274 return 0xffffffff;
275 }
276}
277EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
278
279int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
280{
281 struct nfc_target *targets;
282 struct sk_buff *atqa_skb = NULL;
283 struct sk_buff *sak_skb = NULL;
284 struct sk_buff *uid_skb = NULL;
285 int r;
286
287 pr_debug("from gate %d\n", gate);
288
289 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
290 if (targets == NULL)
291 return -ENOMEM;
292
293 switch (gate) {
294 case NFC_HCI_RF_READER_A_GATE:
295 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
296 NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
297 if (r < 0)
298 goto exit;
299
300 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
301 NFC_HCI_RF_READER_A_SAK, &sak_skb);
302 if (r < 0)
303 goto exit;
304
305 if (atqa_skb->len != 2 || sak_skb->len != 1) {
306 r = -EPROTO;
307 goto exit;
308 }
309
310 targets->supported_protocols =
311 nfc_hci_sak_to_protocol(sak_skb->data[0]);
312 if (targets->supported_protocols == 0xffffffff) {
313 r = -EPROTO;
314 goto exit;
315 }
316
317 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
318 targets->sel_res = sak_skb->data[0];
319
320 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
321 NFC_HCI_RF_READER_A_UID, &uid_skb);
322 if (r < 0)
323 goto exit;
324
325 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
326 r = -EPROTO;
327 goto exit;
328 }
329
330 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
331 targets->nfcid1_len = uid_skb->len;
332
333 if (hdev->ops->complete_target_discovered) {
334 r = hdev->ops->complete_target_discovered(hdev, gate,
335 targets);
336 if (r < 0)
337 goto exit;
338 }
339 break;
340 case NFC_HCI_RF_READER_B_GATE:
341 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
342 break;
343 default:
344 if (hdev->ops->target_from_gate)
345 r = hdev->ops->target_from_gate(hdev, gate, targets);
346 else
347 r = -EPROTO;
348 if (r < 0)
349 goto exit;
350
351 if (hdev->ops->complete_target_discovered) {
352 r = hdev->ops->complete_target_discovered(hdev, gate,
353 targets);
354 if (r < 0)
355 goto exit;
356 }
357 break;
358 }
359
360 /* if driver set the new gate, we will skip the old one */
361 if (targets->hci_reader_gate == 0x00)
362 targets->hci_reader_gate = gate;
363
364 r = nfc_targets_found(hdev->ndev, targets, 1);
365
366exit:
367 kfree(targets);
368 kfree_skb(atqa_skb);
369 kfree_skb(sak_skb);
370 kfree_skb(uid_skb);
371
372 return r;
373}
374EXPORT_SYMBOL(nfc_hci_target_discovered);
375
376void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
377 struct sk_buff *skb)
378{
379 int r = 0;
380 u8 gate = hdev->pipes[pipe].gate;
381
382 if (gate == NFC_HCI_INVALID_GATE) {
383 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
384 goto exit;
385 }
386
387 if (hdev->ops->event_received) {
388 r = hdev->ops->event_received(hdev, pipe, event, skb);
389 if (r <= 0)
390 goto exit_noskb;
391 }
392
393 switch (event) {
394 case NFC_HCI_EVT_TARGET_DISCOVERED:
395 if (skb->len < 1) { /* no status data? */
396 r = -EPROTO;
397 goto exit;
398 }
399
400 if (skb->data[0] == 3) {
401 /* TODO: Multiple targets in field, none activated
402 * poll is supposedly stopped, but there is no
403 * single target to activate, so nothing to report
404 * up.
405 * if we need to restart poll, we must save the
406 * protocols from the initial poll and reuse here.
407 */
408 }
409
410 if (skb->data[0] != 0) {
411 r = -EPROTO;
412 goto exit;
413 }
414
415 r = nfc_hci_target_discovered(hdev, gate);
416 break;
417 default:
418 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
419 r = -EINVAL;
420 break;
421 }
422
423exit:
424 kfree_skb(skb);
425
426exit_noskb:
427 if (r)
428 nfc_hci_driver_failure(hdev, r);
429}
430
431static void nfc_hci_cmd_timeout(struct timer_list *t)
432{
433 struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
434
435 schedule_work(&hdev->msg_tx_work);
436}
437
438static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
439 struct nfc_hci_gate *gates)
440{
441 int r;
442 while (gate_count--) {
443 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
444 gates->gate, gates->pipe);
445 if (r < 0)
446 return r;
447 gates++;
448 }
449
450 return 0;
451}
452
453static int hci_dev_session_init(struct nfc_hci_dev *hdev)
454{
455 struct sk_buff *skb = NULL;
456 int r;
457
458 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
459 return -EPROTO;
460
461 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
462 hdev->init_data.gates[0].gate,
463 hdev->init_data.gates[0].pipe);
464 if (r < 0)
465 goto exit;
466
467 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
468 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
469 if (r < 0)
470 goto disconnect_all;
471
472 if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
473 (memcmp(hdev->init_data.session_id, skb->data,
474 skb->len) == 0) && hdev->ops->load_session) {
475 /* Restore gate<->pipe table from some proprietary location. */
476
477 r = hdev->ops->load_session(hdev);
478
479 if (r < 0)
480 goto disconnect_all;
481 } else {
482
483 r = nfc_hci_disconnect_all_gates(hdev);
484 if (r < 0)
485 goto exit;
486
487 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
488 hdev->init_data.gates);
489 if (r < 0)
490 goto disconnect_all;
491
492 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
493 NFC_HCI_ADMIN_SESSION_IDENTITY,
494 hdev->init_data.session_id,
495 strlen(hdev->init_data.session_id));
496 }
497 if (r == 0)
498 goto exit;
499
500disconnect_all:
501 nfc_hci_disconnect_all_gates(hdev);
502
503exit:
504 kfree_skb(skb);
505
506 return r;
507}
508
509static int hci_dev_version(struct nfc_hci_dev *hdev)
510{
511 int r;
512 struct sk_buff *skb;
513
514 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
515 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
516 if (r == -EOPNOTSUPP) {
517 pr_info("Software/Hardware info not available\n");
518 return 0;
519 }
520 if (r < 0)
521 return r;
522
523 if (skb->len != 3) {
524 kfree_skb(skb);
525 return -EINVAL;
526 }
527
528 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
529 hdev->sw_patch = skb->data[0] & 0x0f;
530 hdev->sw_flashlib_major = skb->data[1];
531 hdev->sw_flashlib_minor = skb->data[2];
532
533 kfree_skb(skb);
534
535 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
536 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
537 if (r < 0)
538 return r;
539
540 if (skb->len != 3) {
541 kfree_skb(skb);
542 return -EINVAL;
543 }
544
545 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
546 hdev->hw_version = skb->data[0] & 0x1f;
547 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
548 hdev->hw_software = skb->data[1] & 0x3f;
549 hdev->hw_bsid = skb->data[2];
550
551 kfree_skb(skb);
552
553 pr_info("SOFTWARE INFO:\n");
554 pr_info("RomLib : %d\n", hdev->sw_romlib);
555 pr_info("Patch : %d\n", hdev->sw_patch);
556 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
557 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
558 pr_info("HARDWARE INFO:\n");
559 pr_info("Derivative : %d\n", hdev->hw_derivative);
560 pr_info("HW Version : %d\n", hdev->hw_version);
561 pr_info("#MPW : %d\n", hdev->hw_mpw);
562 pr_info("Software : %d\n", hdev->hw_software);
563 pr_info("BSID Version : %d\n", hdev->hw_bsid);
564
565 return 0;
566}
567
568static int hci_dev_up(struct nfc_dev *nfc_dev)
569{
570 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
571 int r = 0;
572
573 if (hdev->ops->open) {
574 r = hdev->ops->open(hdev);
575 if (r < 0)
576 return r;
577 }
578
579 r = nfc_llc_start(hdev->llc);
580 if (r < 0)
581 goto exit_close;
582
583 r = hci_dev_session_init(hdev);
584 if (r < 0)
585 goto exit_llc;
586
587 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
588 NFC_HCI_EVT_END_OPERATION, NULL, 0);
589 if (r < 0)
590 goto exit_llc;
591
592 if (hdev->ops->hci_ready) {
593 r = hdev->ops->hci_ready(hdev);
594 if (r < 0)
595 goto exit_llc;
596 }
597
598 r = hci_dev_version(hdev);
599 if (r < 0)
600 goto exit_llc;
601
602 return 0;
603
604exit_llc:
605 nfc_llc_stop(hdev->llc);
606
607exit_close:
608 if (hdev->ops->close)
609 hdev->ops->close(hdev);
610
611 return r;
612}
613
614static int hci_dev_down(struct nfc_dev *nfc_dev)
615{
616 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
617
618 nfc_llc_stop(hdev->llc);
619
620 if (hdev->ops->close)
621 hdev->ops->close(hdev);
622
623 nfc_hci_reset_pipes(hdev);
624
625 return 0;
626}
627
628static int hci_start_poll(struct nfc_dev *nfc_dev,
629 u32 im_protocols, u32 tm_protocols)
630{
631 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
632
633 if (hdev->ops->start_poll)
634 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
635 else
636 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
637 NFC_HCI_EVT_READER_REQUESTED,
638 NULL, 0);
639}
640
641static void hci_stop_poll(struct nfc_dev *nfc_dev)
642{
643 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
644
645 if (hdev->ops->stop_poll)
646 hdev->ops->stop_poll(hdev);
647 else
648 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
649 NFC_HCI_EVT_END_OPERATION, NULL, 0);
650}
651
652static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
653 __u8 comm_mode, __u8 *gb, size_t gb_len)
654{
655 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
656
657 if (!hdev->ops->dep_link_up)
658 return 0;
659
660 return hdev->ops->dep_link_up(hdev, target, comm_mode,
661 gb, gb_len);
662}
663
664static int hci_dep_link_down(struct nfc_dev *nfc_dev)
665{
666 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
667
668 if (!hdev->ops->dep_link_down)
669 return 0;
670
671 return hdev->ops->dep_link_down(hdev);
672}
673
674static int hci_activate_target(struct nfc_dev *nfc_dev,
675 struct nfc_target *target, u32 protocol)
676{
677 return 0;
678}
679
680static void hci_deactivate_target(struct nfc_dev *nfc_dev,
681 struct nfc_target *target,
682 u8 mode)
683{
684}
685
686#define HCI_CB_TYPE_TRANSCEIVE 1
687
688static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
689{
690 struct nfc_hci_dev *hdev = context;
691
692 switch (hdev->async_cb_type) {
693 case HCI_CB_TYPE_TRANSCEIVE:
694 /*
695 * TODO: Check RF Error indicator to make sure data is valid.
696 * It seems that HCI cmd can complete without error, but data
697 * can be invalid if an RF error occured? Ignore for now.
698 */
699 if (err == 0)
700 skb_trim(skb, skb->len - 1); /* RF Err ind */
701
702 hdev->async_cb(hdev->async_cb_context, skb, err);
703 break;
704 default:
705 if (err == 0)
706 kfree_skb(skb);
707 break;
708 }
709}
710
711static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
712 struct sk_buff *skb, data_exchange_cb_t cb,
713 void *cb_context)
714{
715 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
716 int r;
717
718 pr_debug("target_idx=%d\n", target->idx);
719
720 switch (target->hci_reader_gate) {
721 case NFC_HCI_RF_READER_A_GATE:
722 case NFC_HCI_RF_READER_B_GATE:
723 if (hdev->ops->im_transceive) {
724 r = hdev->ops->im_transceive(hdev, target, skb, cb,
725 cb_context);
726 if (r <= 0) /* handled */
727 break;
728 }
729
730 *(u8 *)skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
731
732 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
733 hdev->async_cb = cb;
734 hdev->async_cb_context = cb_context;
735
736 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
737 NFC_HCI_WR_XCHG_DATA, skb->data,
738 skb->len, hci_transceive_cb, hdev);
739 break;
740 default:
741 if (hdev->ops->im_transceive) {
742 r = hdev->ops->im_transceive(hdev, target, skb, cb,
743 cb_context);
744 if (r == 1)
745 r = -ENOTSUPP;
746 } else {
747 r = -ENOTSUPP;
748 }
749 break;
750 }
751
752 kfree_skb(skb);
753
754 return r;
755}
756
757static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
758{
759 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
760
761 if (!hdev->ops->tm_send) {
762 kfree_skb(skb);
763 return -ENOTSUPP;
764 }
765
766 return hdev->ops->tm_send(hdev, skb);
767}
768
769static int hci_check_presence(struct nfc_dev *nfc_dev,
770 struct nfc_target *target)
771{
772 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
773
774 if (!hdev->ops->check_presence)
775 return 0;
776
777 return hdev->ops->check_presence(hdev, target);
778}
779
780static int hci_discover_se(struct nfc_dev *nfc_dev)
781{
782 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
783
784 if (hdev->ops->discover_se)
785 return hdev->ops->discover_se(hdev);
786
787 return 0;
788}
789
790static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
791{
792 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
793
794 if (hdev->ops->enable_se)
795 return hdev->ops->enable_se(hdev, se_idx);
796
797 return 0;
798}
799
800static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
801{
802 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
803
804 if (hdev->ops->disable_se)
805 return hdev->ops->disable_se(hdev, se_idx);
806
807 return 0;
808}
809
810static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
811 u8 *apdu, size_t apdu_length,
812 se_io_cb_t cb, void *cb_context)
813{
814 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
815
816 if (hdev->ops->se_io)
817 return hdev->ops->se_io(hdev, se_idx, apdu,
818 apdu_length, cb, cb_context);
819
820 return 0;
821}
822
823static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
824{
825 mutex_lock(&hdev->msg_tx_mutex);
826
827 if (hdev->cmd_pending_msg == NULL) {
828 nfc_driver_failure(hdev->ndev, err);
829 goto exit;
830 }
831
832 __nfc_hci_cmd_completion(hdev, err, NULL);
833
834exit:
835 mutex_unlock(&hdev->msg_tx_mutex);
836}
837
838static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
839{
840 nfc_hci_failure(hdev, err);
841}
842
843static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
844{
845 struct hcp_packet *packet;
846 u8 type;
847 u8 instruction;
848 struct sk_buff *hcp_skb;
849 u8 pipe;
850 struct sk_buff *frag_skb;
851 int msg_len;
852
853 packet = (struct hcp_packet *)skb->data;
854 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
855 skb_queue_tail(&hdev->rx_hcp_frags, skb);
856 return;
857 }
858
859 /* it's the last fragment. Does it need re-aggregation? */
860 if (skb_queue_len(&hdev->rx_hcp_frags)) {
861 pipe = packet->header & NFC_HCI_FRAGMENT;
862 skb_queue_tail(&hdev->rx_hcp_frags, skb);
863
864 msg_len = 0;
865 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
866 msg_len += (frag_skb->len -
867 NFC_HCI_HCP_PACKET_HEADER_LEN);
868 }
869
870 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
871 msg_len, GFP_KERNEL);
872 if (hcp_skb == NULL) {
873 nfc_hci_failure(hdev, -ENOMEM);
874 return;
875 }
876
877 skb_put_u8(hcp_skb, pipe);
878
879 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
880 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
881 skb_put_data(hcp_skb,
882 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
883 msg_len);
884 }
885
886 skb_queue_purge(&hdev->rx_hcp_frags);
887 } else {
888 packet->header &= NFC_HCI_FRAGMENT;
889 hcp_skb = skb;
890 }
891
892 /* if this is a response, dispatch immediately to
893 * unblock waiting cmd context. Otherwise, enqueue to dispatch
894 * in separate context where handler can also execute command.
895 */
896 packet = (struct hcp_packet *)hcp_skb->data;
897 type = HCP_MSG_GET_TYPE(packet->message.header);
898 if (type == NFC_HCI_HCP_RESPONSE) {
899 pipe = packet->header;
900 instruction = HCP_MSG_GET_CMD(packet->message.header);
901 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
902 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
903 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
904 } else {
905 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
906 schedule_work(&hdev->msg_rx_work);
907 }
908}
909
910static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
911{
912 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
913
914 if (!hdev->ops->fw_download)
915 return -ENOTSUPP;
916
917 return hdev->ops->fw_download(hdev, firmware_name);
918}
919
920static struct nfc_ops hci_nfc_ops = {
921 .dev_up = hci_dev_up,
922 .dev_down = hci_dev_down,
923 .start_poll = hci_start_poll,
924 .stop_poll = hci_stop_poll,
925 .dep_link_up = hci_dep_link_up,
926 .dep_link_down = hci_dep_link_down,
927 .activate_target = hci_activate_target,
928 .deactivate_target = hci_deactivate_target,
929 .im_transceive = hci_transceive,
930 .tm_send = hci_tm_send,
931 .check_presence = hci_check_presence,
932 .fw_download = hci_fw_download,
933 .discover_se = hci_discover_se,
934 .enable_se = hci_enable_se,
935 .disable_se = hci_disable_se,
936 .se_io = hci_se_io,
937};
938
939struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
940 struct nfc_hci_init_data *init_data,
941 unsigned long quirks,
942 u32 protocols,
943 const char *llc_name,
944 int tx_headroom,
945 int tx_tailroom,
946 int max_link_payload)
947{
948 struct nfc_hci_dev *hdev;
949
950 if (ops->xmit == NULL)
951 return NULL;
952
953 if (protocols == 0)
954 return NULL;
955
956 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
957 if (hdev == NULL)
958 return NULL;
959
960 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
961 nfc_hci_recv_from_llc, tx_headroom,
962 tx_tailroom, nfc_hci_llc_failure);
963 if (hdev->llc == NULL) {
964 kfree(hdev);
965 return NULL;
966 }
967
968 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
969 tx_headroom + HCI_CMDS_HEADROOM,
970 tx_tailroom);
971 if (!hdev->ndev) {
972 nfc_llc_free(hdev->llc);
973 kfree(hdev);
974 return NULL;
975 }
976
977 hdev->ops = ops;
978 hdev->max_data_link_payload = max_link_payload;
979 hdev->init_data = *init_data;
980
981 nfc_set_drvdata(hdev->ndev, hdev);
982
983 nfc_hci_reset_pipes(hdev);
984
985 hdev->quirks = quirks;
986
987 return hdev;
988}
989EXPORT_SYMBOL(nfc_hci_allocate_device);
990
991void nfc_hci_free_device(struct nfc_hci_dev *hdev)
992{
993 nfc_free_device(hdev->ndev);
994 nfc_llc_free(hdev->llc);
995 kfree(hdev);
996}
997EXPORT_SYMBOL(nfc_hci_free_device);
998
999int nfc_hci_register_device(struct nfc_hci_dev *hdev)
1000{
1001 mutex_init(&hdev->msg_tx_mutex);
1002
1003 INIT_LIST_HEAD(&hdev->msg_tx_queue);
1004
1005 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1006
1007 timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
1008
1009 skb_queue_head_init(&hdev->rx_hcp_frags);
1010
1011 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1012
1013 skb_queue_head_init(&hdev->msg_rx_queue);
1014
1015 return nfc_register_device(hdev->ndev);
1016}
1017EXPORT_SYMBOL(nfc_hci_register_device);
1018
1019void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1020{
1021 struct hci_msg *msg, *n;
1022
1023 mutex_lock(&hdev->msg_tx_mutex);
1024
1025 if (hdev->cmd_pending_msg) {
1026 if (hdev->cmd_pending_msg->cb)
1027 hdev->cmd_pending_msg->cb(
1028 hdev->cmd_pending_msg->cb_context,
1029 NULL, -ESHUTDOWN);
1030 kfree(hdev->cmd_pending_msg);
1031 hdev->cmd_pending_msg = NULL;
1032 }
1033
1034 hdev->shutting_down = true;
1035
1036 mutex_unlock(&hdev->msg_tx_mutex);
1037
1038 del_timer_sync(&hdev->cmd_timer);
1039 cancel_work_sync(&hdev->msg_tx_work);
1040
1041 cancel_work_sync(&hdev->msg_rx_work);
1042
1043 nfc_unregister_device(hdev->ndev);
1044
1045 skb_queue_purge(&hdev->rx_hcp_frags);
1046 skb_queue_purge(&hdev->msg_rx_queue);
1047
1048 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1049 list_del(&msg->msg_l);
1050 skb_queue_purge(&msg->msg_frags);
1051 kfree(msg);
1052 }
1053}
1054EXPORT_SYMBOL(nfc_hci_unregister_device);
1055
1056void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1057{
1058 hdev->clientdata = clientdata;
1059}
1060EXPORT_SYMBOL(nfc_hci_set_clientdata);
1061
1062void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1063{
1064 return hdev->clientdata;
1065}
1066EXPORT_SYMBOL(nfc_hci_get_clientdata);
1067
1068void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1069{
1070 nfc_hci_failure(hdev, err);
1071}
1072EXPORT_SYMBOL(nfc_hci_driver_failure);
1073
1074void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1075{
1076 nfc_llc_rcv_from_drv(hdev->llc, skb);
1077}
1078EXPORT_SYMBOL(nfc_hci_recv_frame);
1079
1080static int __init nfc_hci_init(void)
1081{
1082 return nfc_llc_init();
1083}
1084
1085static void __exit nfc_hci_exit(void)
1086{
1087 nfc_llc_exit();
1088}
1089
1090subsys_initcall(nfc_hci_init);
1091module_exit(nfc_hci_exit);
1092
1093MODULE_LICENSE("GPL");
1094MODULE_DESCRIPTION("NFC HCI Core");
1/*
2 * Copyright (C) 2012 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#define pr_fmt(fmt) "hci: %s: " fmt, __func__
21
22#include <linux/init.h>
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/nfc.h>
26
27#include <net/nfc/nfc.h>
28#include <net/nfc/hci.h>
29
30#include "hci.h"
31
32/* Largest headroom needed for outgoing HCI commands */
33#define HCI_CMDS_HEADROOM 1
34
35static void nfc_hci_msg_tx_work(struct work_struct *work)
36{
37 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
38 msg_tx_work);
39 struct hci_msg *msg;
40 struct sk_buff *skb;
41 int r = 0;
42
43 mutex_lock(&hdev->msg_tx_mutex);
44
45 if (hdev->cmd_pending_msg) {
46 if (timer_pending(&hdev->cmd_timer) == 0) {
47 if (hdev->cmd_pending_msg->cb)
48 hdev->cmd_pending_msg->cb(hdev,
49 NFC_HCI_ANY_E_TIMEOUT,
50 NULL,
51 hdev->
52 cmd_pending_msg->
53 cb_context);
54 kfree(hdev->cmd_pending_msg);
55 hdev->cmd_pending_msg = NULL;
56 } else
57 goto exit;
58 }
59
60next_msg:
61 if (list_empty(&hdev->msg_tx_queue))
62 goto exit;
63
64 msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
65 list_del(&msg->msg_l);
66
67 pr_debug("msg_tx_queue has a cmd to send\n");
68 while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
69 r = hdev->ops->xmit(hdev, skb);
70 if (r < 0) {
71 kfree_skb(skb);
72 skb_queue_purge(&msg->msg_frags);
73 if (msg->cb)
74 msg->cb(hdev, NFC_HCI_ANY_E_NOK, NULL,
75 msg->cb_context);
76 kfree(msg);
77 break;
78 }
79 }
80
81 if (r)
82 goto next_msg;
83
84 if (msg->wait_response == false) {
85 kfree(msg);
86 goto next_msg;
87 }
88
89 hdev->cmd_pending_msg = msg;
90 mod_timer(&hdev->cmd_timer, jiffies +
91 msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
92
93exit:
94 mutex_unlock(&hdev->msg_tx_mutex);
95}
96
97static void nfc_hci_msg_rx_work(struct work_struct *work)
98{
99 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
100 msg_rx_work);
101 struct sk_buff *skb;
102 struct hcp_message *message;
103 u8 pipe;
104 u8 type;
105 u8 instruction;
106
107 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
108 pipe = skb->data[0];
109 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
110 message = (struct hcp_message *)skb->data;
111 type = HCP_MSG_GET_TYPE(message->header);
112 instruction = HCP_MSG_GET_CMD(message->header);
113 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
114
115 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
116 }
117}
118
119void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
120 struct sk_buff *skb)
121{
122 mutex_lock(&hdev->msg_tx_mutex);
123
124 if (hdev->cmd_pending_msg == NULL) {
125 kfree_skb(skb);
126 goto exit;
127 }
128
129 del_timer_sync(&hdev->cmd_timer);
130
131 if (hdev->cmd_pending_msg->cb)
132 hdev->cmd_pending_msg->cb(hdev, result, skb,
133 hdev->cmd_pending_msg->cb_context);
134 else
135 kfree_skb(skb);
136
137 kfree(hdev->cmd_pending_msg);
138 hdev->cmd_pending_msg = NULL;
139
140 queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
141
142exit:
143 mutex_unlock(&hdev->msg_tx_mutex);
144}
145
146void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
147 struct sk_buff *skb)
148{
149 kfree_skb(skb);
150}
151
152static u32 nfc_hci_sak_to_protocol(u8 sak)
153{
154 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
155 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
156 return NFC_PROTO_MIFARE_MASK;
157 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
158 return NFC_PROTO_ISO14443_MASK;
159 case NFC_HCI_TYPE_A_SEL_PROT_DEP:
160 return NFC_PROTO_NFC_DEP_MASK;
161 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
162 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
163 default:
164 return 0xffffffff;
165 }
166}
167
168static int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
169{
170 struct nfc_target *targets;
171 struct sk_buff *atqa_skb = NULL;
172 struct sk_buff *sak_skb = NULL;
173 int r;
174
175 pr_debug("from gate %d\n", gate);
176
177 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
178 if (targets == NULL)
179 return -ENOMEM;
180
181 switch (gate) {
182 case NFC_HCI_RF_READER_A_GATE:
183 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
184 NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
185 if (r < 0)
186 goto exit;
187
188 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
189 NFC_HCI_RF_READER_A_SAK, &sak_skb);
190 if (r < 0)
191 goto exit;
192
193 if (atqa_skb->len != 2 || sak_skb->len != 1) {
194 r = -EPROTO;
195 goto exit;
196 }
197
198 targets->supported_protocols =
199 nfc_hci_sak_to_protocol(sak_skb->data[0]);
200 if (targets->supported_protocols == 0xffffffff) {
201 r = -EPROTO;
202 goto exit;
203 }
204
205 targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
206 targets->sel_res = sak_skb->data[0];
207
208 if (hdev->ops->complete_target_discovered) {
209 r = hdev->ops->complete_target_discovered(hdev, gate,
210 targets);
211 if (r < 0)
212 goto exit;
213 }
214 break;
215 case NFC_HCI_RF_READER_B_GATE:
216 targets->supported_protocols = NFC_PROTO_ISO14443_MASK;
217 break;
218 default:
219 if (hdev->ops->target_from_gate)
220 r = hdev->ops->target_from_gate(hdev, gate, targets);
221 else
222 r = -EPROTO;
223 if (r < 0)
224 goto exit;
225
226 if (hdev->ops->complete_target_discovered) {
227 r = hdev->ops->complete_target_discovered(hdev, gate,
228 targets);
229 if (r < 0)
230 goto exit;
231 }
232 break;
233 }
234
235 targets->hci_reader_gate = gate;
236
237 r = nfc_targets_found(hdev->ndev, targets, 1);
238
239exit:
240 kfree(targets);
241 kfree_skb(atqa_skb);
242 kfree_skb(sak_skb);
243
244 return r;
245}
246
247void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
248 struct sk_buff *skb)
249{
250 int r = 0;
251
252 switch (event) {
253 case NFC_HCI_EVT_TARGET_DISCOVERED:
254 if (skb->len < 1) { /* no status data? */
255 r = -EPROTO;
256 goto exit;
257 }
258
259 if (skb->data[0] == 3) {
260 /* TODO: Multiple targets in field, none activated
261 * poll is supposedly stopped, but there is no
262 * single target to activate, so nothing to report
263 * up.
264 * if we need to restart poll, we must save the
265 * protocols from the initial poll and reuse here.
266 */
267 }
268
269 if (skb->data[0] != 0) {
270 r = -EPROTO;
271 goto exit;
272 }
273
274 r = nfc_hci_target_discovered(hdev,
275 nfc_hci_pipe2gate(hdev, pipe));
276 break;
277 default:
278 /* TODO: Unknown events are hardware specific
279 * pass them to the driver (needs a new hci_ops) */
280 break;
281 }
282
283exit:
284 kfree_skb(skb);
285
286 if (r) {
287 /* TODO: There was an error dispatching the event,
288 * how to propagate up to nfc core?
289 */
290 }
291}
292
293static void nfc_hci_cmd_timeout(unsigned long data)
294{
295 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
296
297 queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
298}
299
300static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
301 u8 gates[])
302{
303 int r;
304 u8 *p = gates;
305 while (gate_count--) {
306 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, *p);
307 if (r < 0)
308 return r;
309 p++;
310 }
311
312 return 0;
313}
314
315static int hci_dev_session_init(struct nfc_hci_dev *hdev)
316{
317 struct sk_buff *skb = NULL;
318 int r;
319 u8 hci_gates[] = { /* NFC_HCI_ADMIN_GATE MUST be first */
320 NFC_HCI_ADMIN_GATE, NFC_HCI_LOOPBACK_GATE,
321 NFC_HCI_ID_MGMT_GATE, NFC_HCI_LINK_MGMT_GATE,
322 NFC_HCI_RF_READER_B_GATE, NFC_HCI_RF_READER_A_GATE
323 };
324
325 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
326 NFC_HCI_ADMIN_GATE);
327 if (r < 0)
328 goto exit;
329
330 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
331 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
332 if (r < 0)
333 goto disconnect_all;
334
335 if (skb->len && skb->len == strlen(hdev->init_data.session_id))
336 if (memcmp(hdev->init_data.session_id, skb->data,
337 skb->len) == 0) {
338 /* TODO ELa: restore gate<->pipe table from
339 * some TBD location.
340 * note: it doesn't seem possible to get the chip
341 * currently open gate/pipe table.
342 * It is only possible to obtain the supported
343 * gate list.
344 */
345
346 /* goto exit
347 * For now, always do a full initialization */
348 }
349
350 r = nfc_hci_disconnect_all_gates(hdev);
351 if (r < 0)
352 goto exit;
353
354 r = hci_dev_connect_gates(hdev, sizeof(hci_gates), hci_gates);
355 if (r < 0)
356 goto disconnect_all;
357
358 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
359 hdev->init_data.gates);
360 if (r < 0)
361 goto disconnect_all;
362
363 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
364 NFC_HCI_ADMIN_SESSION_IDENTITY,
365 hdev->init_data.session_id,
366 strlen(hdev->init_data.session_id));
367 if (r == 0)
368 goto exit;
369
370disconnect_all:
371 nfc_hci_disconnect_all_gates(hdev);
372
373exit:
374 if (skb)
375 kfree_skb(skb);
376
377 return r;
378}
379
380static int hci_dev_version(struct nfc_hci_dev *hdev)
381{
382 int r;
383 struct sk_buff *skb;
384
385 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
386 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
387 if (r < 0)
388 return r;
389
390 if (skb->len != 3) {
391 kfree_skb(skb);
392 return -EINVAL;
393 }
394
395 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
396 hdev->sw_patch = skb->data[0] & 0x0f;
397 hdev->sw_flashlib_major = skb->data[1];
398 hdev->sw_flashlib_minor = skb->data[2];
399
400 kfree_skb(skb);
401
402 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
403 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
404 if (r < 0)
405 return r;
406
407 if (skb->len != 3) {
408 kfree_skb(skb);
409 return -EINVAL;
410 }
411
412 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
413 hdev->hw_version = skb->data[0] & 0x1f;
414 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
415 hdev->hw_software = skb->data[1] & 0x3f;
416 hdev->hw_bsid = skb->data[2];
417
418 kfree_skb(skb);
419
420 pr_info("SOFTWARE INFO:\n");
421 pr_info("RomLib : %d\n", hdev->sw_romlib);
422 pr_info("Patch : %d\n", hdev->sw_patch);
423 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
424 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
425 pr_info("HARDWARE INFO:\n");
426 pr_info("Derivative : %d\n", hdev->hw_derivative);
427 pr_info("HW Version : %d\n", hdev->hw_version);
428 pr_info("#MPW : %d\n", hdev->hw_mpw);
429 pr_info("Software : %d\n", hdev->hw_software);
430 pr_info("BSID Version : %d\n", hdev->hw_bsid);
431
432 return 0;
433}
434
435static int hci_dev_up(struct nfc_dev *nfc_dev)
436{
437 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
438 int r = 0;
439
440 if (hdev->ops->open) {
441 r = hdev->ops->open(hdev);
442 if (r < 0)
443 return r;
444 }
445
446 r = hci_dev_session_init(hdev);
447 if (r < 0)
448 goto exit;
449
450 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
451 NFC_HCI_EVT_END_OPERATION, NULL, 0);
452 if (r < 0)
453 goto exit;
454
455 if (hdev->ops->hci_ready) {
456 r = hdev->ops->hci_ready(hdev);
457 if (r < 0)
458 goto exit;
459 }
460
461 r = hci_dev_version(hdev);
462 if (r < 0)
463 goto exit;
464
465exit:
466 if (r < 0)
467 if (hdev->ops->close)
468 hdev->ops->close(hdev);
469 return r;
470}
471
472static int hci_dev_down(struct nfc_dev *nfc_dev)
473{
474 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
475
476 if (hdev->ops->close)
477 hdev->ops->close(hdev);
478
479 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
480
481 return 0;
482}
483
484static int hci_start_poll(struct nfc_dev *nfc_dev, u32 protocols)
485{
486 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
487
488 if (hdev->ops->start_poll)
489 return hdev->ops->start_poll(hdev, protocols);
490 else
491 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
492 NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
493}
494
495static void hci_stop_poll(struct nfc_dev *nfc_dev)
496{
497 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
498
499 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
500 NFC_HCI_EVT_END_OPERATION, NULL, 0);
501}
502
503static int hci_activate_target(struct nfc_dev *nfc_dev,
504 struct nfc_target *target, u32 protocol)
505{
506 return 0;
507}
508
509static void hci_deactivate_target(struct nfc_dev *nfc_dev,
510 struct nfc_target *target)
511{
512}
513
514static int hci_data_exchange(struct nfc_dev *nfc_dev, struct nfc_target *target,
515 struct sk_buff *skb, data_exchange_cb_t cb,
516 void *cb_context)
517{
518 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
519 int r;
520 struct sk_buff *res_skb = NULL;
521
522 pr_debug("target_idx=%d\n", target->idx);
523
524 switch (target->hci_reader_gate) {
525 case NFC_HCI_RF_READER_A_GATE:
526 case NFC_HCI_RF_READER_B_GATE:
527 if (hdev->ops->data_exchange) {
528 r = hdev->ops->data_exchange(hdev, target, skb,
529 &res_skb);
530 if (r <= 0) /* handled */
531 break;
532 }
533
534 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
535 r = nfc_hci_send_cmd(hdev, target->hci_reader_gate,
536 NFC_HCI_WR_XCHG_DATA,
537 skb->data, skb->len, &res_skb);
538 /*
539 * TODO: Check RF Error indicator to make sure data is valid.
540 * It seems that HCI cmd can complete without error, but data
541 * can be invalid if an RF error occured? Ignore for now.
542 */
543 if (r == 0)
544 skb_trim(res_skb, res_skb->len - 1); /* RF Err ind */
545 break;
546 default:
547 if (hdev->ops->data_exchange) {
548 r = hdev->ops->data_exchange(hdev, target, skb,
549 &res_skb);
550 if (r == 1)
551 r = -ENOTSUPP;
552 }
553 else
554 r = -ENOTSUPP;
555 }
556
557 kfree_skb(skb);
558
559 cb(cb_context, res_skb, r);
560
561 return 0;
562}
563
564static int hci_check_presence(struct nfc_dev *nfc_dev,
565 struct nfc_target *target)
566{
567 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
568
569 if (hdev->ops->check_presence)
570 return hdev->ops->check_presence(hdev, target);
571
572 return 0;
573}
574
575static struct nfc_ops hci_nfc_ops = {
576 .dev_up = hci_dev_up,
577 .dev_down = hci_dev_down,
578 .start_poll = hci_start_poll,
579 .stop_poll = hci_stop_poll,
580 .activate_target = hci_activate_target,
581 .deactivate_target = hci_deactivate_target,
582 .data_exchange = hci_data_exchange,
583 .check_presence = hci_check_presence,
584};
585
586struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
587 struct nfc_hci_init_data *init_data,
588 u32 protocols,
589 int tx_headroom,
590 int tx_tailroom,
591 int max_link_payload)
592{
593 struct nfc_hci_dev *hdev;
594
595 if (ops->xmit == NULL)
596 return NULL;
597
598 if (protocols == 0)
599 return NULL;
600
601 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
602 if (hdev == NULL)
603 return NULL;
604
605 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
606 tx_headroom + HCI_CMDS_HEADROOM,
607 tx_tailroom);
608 if (!hdev->ndev) {
609 kfree(hdev);
610 return NULL;
611 }
612
613 hdev->ops = ops;
614 hdev->max_data_link_payload = max_link_payload;
615 hdev->init_data = *init_data;
616
617 nfc_set_drvdata(hdev->ndev, hdev);
618
619 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
620
621 return hdev;
622}
623EXPORT_SYMBOL(nfc_hci_allocate_device);
624
625void nfc_hci_free_device(struct nfc_hci_dev *hdev)
626{
627 nfc_free_device(hdev->ndev);
628 kfree(hdev);
629}
630EXPORT_SYMBOL(nfc_hci_free_device);
631
632int nfc_hci_register_device(struct nfc_hci_dev *hdev)
633{
634 struct device *dev = &hdev->ndev->dev;
635 const char *devname = dev_name(dev);
636 char name[32];
637 int r = 0;
638
639 mutex_init(&hdev->msg_tx_mutex);
640
641 INIT_LIST_HEAD(&hdev->msg_tx_queue);
642
643 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
644 snprintf(name, sizeof(name), "%s_hci_msg_tx_wq", devname);
645 hdev->msg_tx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
646 WQ_MEM_RECLAIM, 1);
647 if (hdev->msg_tx_wq == NULL) {
648 r = -ENOMEM;
649 goto exit;
650 }
651
652 init_timer(&hdev->cmd_timer);
653 hdev->cmd_timer.data = (unsigned long)hdev;
654 hdev->cmd_timer.function = nfc_hci_cmd_timeout;
655
656 skb_queue_head_init(&hdev->rx_hcp_frags);
657
658 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
659 snprintf(name, sizeof(name), "%s_hci_msg_rx_wq", devname);
660 hdev->msg_rx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
661 WQ_MEM_RECLAIM, 1);
662 if (hdev->msg_rx_wq == NULL) {
663 r = -ENOMEM;
664 goto exit;
665 }
666
667 skb_queue_head_init(&hdev->msg_rx_queue);
668
669 r = nfc_register_device(hdev->ndev);
670
671exit:
672 if (r < 0) {
673 if (hdev->msg_tx_wq)
674 destroy_workqueue(hdev->msg_tx_wq);
675 if (hdev->msg_rx_wq)
676 destroy_workqueue(hdev->msg_rx_wq);
677 }
678
679 return r;
680}
681EXPORT_SYMBOL(nfc_hci_register_device);
682
683void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
684{
685 struct hci_msg *msg;
686
687 skb_queue_purge(&hdev->rx_hcp_frags);
688 skb_queue_purge(&hdev->msg_rx_queue);
689
690 while ((msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg,
691 msg_l)) != NULL) {
692 list_del(&msg->msg_l);
693 skb_queue_purge(&msg->msg_frags);
694 kfree(msg);
695 }
696
697 del_timer_sync(&hdev->cmd_timer);
698
699 nfc_unregister_device(hdev->ndev);
700
701 destroy_workqueue(hdev->msg_tx_wq);
702
703 destroy_workqueue(hdev->msg_rx_wq);
704}
705EXPORT_SYMBOL(nfc_hci_unregister_device);
706
707void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
708{
709 hdev->clientdata = clientdata;
710}
711EXPORT_SYMBOL(nfc_hci_set_clientdata);
712
713void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
714{
715 return hdev->clientdata;
716}
717EXPORT_SYMBOL(nfc_hci_get_clientdata);
718
719void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
720{
721 struct hcp_packet *packet;
722 u8 type;
723 u8 instruction;
724 struct sk_buff *hcp_skb;
725 u8 pipe;
726 struct sk_buff *frag_skb;
727 int msg_len;
728
729 if (skb == NULL) {
730 /* TODO ELa: lower layer had permanent failure, need to
731 * propagate that up
732 */
733
734 skb_queue_purge(&hdev->rx_hcp_frags);
735
736 return;
737 }
738
739 packet = (struct hcp_packet *)skb->data;
740 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
741 skb_queue_tail(&hdev->rx_hcp_frags, skb);
742 return;
743 }
744
745 /* it's the last fragment. Does it need re-aggregation? */
746 if (skb_queue_len(&hdev->rx_hcp_frags)) {
747 pipe = packet->header & NFC_HCI_FRAGMENT;
748 skb_queue_tail(&hdev->rx_hcp_frags, skb);
749
750 msg_len = 0;
751 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
752 msg_len += (frag_skb->len -
753 NFC_HCI_HCP_PACKET_HEADER_LEN);
754 }
755
756 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
757 msg_len, GFP_KERNEL);
758 if (hcp_skb == NULL) {
759 /* TODO ELa: cannot deliver HCP message. How to
760 * propagate error up?
761 */
762 }
763
764 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
765
766 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
767 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
768 memcpy(skb_put(hcp_skb, msg_len),
769 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
770 msg_len);
771 }
772
773 skb_queue_purge(&hdev->rx_hcp_frags);
774 } else {
775 packet->header &= NFC_HCI_FRAGMENT;
776 hcp_skb = skb;
777 }
778
779 /* if this is a response, dispatch immediately to
780 * unblock waiting cmd context. Otherwise, enqueue to dispatch
781 * in separate context where handler can also execute command.
782 */
783 packet = (struct hcp_packet *)hcp_skb->data;
784 type = HCP_MSG_GET_TYPE(packet->message.header);
785 if (type == NFC_HCI_HCP_RESPONSE) {
786 pipe = packet->header;
787 instruction = HCP_MSG_GET_CMD(packet->message.header);
788 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
789 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
790 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
791 } else {
792 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
793 queue_work(hdev->msg_rx_wq, &hdev->msg_rx_work);
794 }
795}
796EXPORT_SYMBOL(nfc_hci_recv_frame);
797
798MODULE_LICENSE("GPL");