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Linux 3.8-rc7
[cris-mirror.git] / net / nfc / hci / core.c
blob7bea574d59344f754ad74a1a390a8d742843549b
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 #include <net/nfc/llc.h>
30
31 #include "hci.h"
32
33 /* Largest headroom needed for outgoing HCI commands */
34 #define HCI_CMDS_HEADROOM 1
35
36 int nfc_hci_result_to_errno(u8 result)
37 {
38 switch (result) {
39 case NFC_HCI_ANY_OK:
40 return 0;
41 case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
42 return -EOPNOTSUPP;
43 case NFC_HCI_ANY_E_TIMEOUT:
44 return -ETIME;
45 default:
46 return -1;
47 }
48 }
49 EXPORT_SYMBOL(nfc_hci_result_to_errno);
50
51 static void nfc_hci_msg_tx_work(struct work_struct *work)
52 {
53 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
54 msg_tx_work);
55 struct hci_msg *msg;
56 struct sk_buff *skb;
57 int r = 0;
58
59 mutex_lock(&hdev->msg_tx_mutex);
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
76 next_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
108 exit:
109 mutex_unlock(&hdev->msg_tx_mutex);
110 }
111
112 static 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
134 static 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
151 void 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
163 exit:
164 mutex_unlock(&hdev->msg_tx_mutex);
165 }
166
167 void 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
173 u32 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 }
188 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
189
190 int 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
277 exit:
278 kfree(targets);
279 kfree_skb(atqa_skb);
280 kfree_skb(sak_skb);
281 kfree_skb(uid_skb);
282
283 return r;
284 }
285 EXPORT_SYMBOL(nfc_hci_target_discovered);
286
287 void 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 switch (event) {
299 case NFC_HCI_EVT_TARGET_DISCOVERED:
300 if (skb->len < 1) { /* no status data? */
301 r = -EPROTO;
302 goto exit;
303 }
304
305 if (skb->data[0] == 3) {
306 /* TODO: Multiple targets in field, none activated
307 * poll is supposedly stopped, but there is no
308 * single target to activate, so nothing to report
309 * up.
310 * if we need to restart poll, we must save the
311 * protocols from the initial poll and reuse here.
312 */
313 }
314
315 if (skb->data[0] != 0) {
316 r = -EPROTO;
317 goto exit;
318 }
319
320 r = nfc_hci_target_discovered(hdev, gate);
321 break;
322 default:
323 if (hdev->ops->event_received) {
324 hdev->ops->event_received(hdev, gate, event, skb);
325 return;
326 }
327
328 break;
329 }
330
331 exit:
332 kfree_skb(skb);
333
334 if (r) {
335 /* TODO: There was an error dispatching the event,
336 * how to propagate up to nfc core?
337 */
338 }
339 }
340
341 static void nfc_hci_cmd_timeout(unsigned long data)
342 {
343 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
344
345 schedule_work(&hdev->msg_tx_work);
346 }
347
348 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
349 struct nfc_hci_gate *gates)
350 {
351 int r;
352 while (gate_count--) {
353 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
354 gates->gate, gates->pipe);
355 if (r < 0)
356 return r;
357 gates++;
358 }
359
360 return 0;
361 }
362
363 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
364 {
365 struct sk_buff *skb = NULL;
366 int r;
367
368 if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
369 return -EPROTO;
370
371 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
372 hdev->init_data.gates[0].gate,
373 hdev->init_data.gates[0].pipe);
374 if (r < 0)
375 goto exit;
376
377 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
378 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
379 if (r < 0)
380 goto disconnect_all;
381
382 if (skb->len && skb->len == strlen(hdev->init_data.session_id))
383 if (memcmp(hdev->init_data.session_id, skb->data,
384 skb->len) == 0) {
385 /* TODO ELa: restore gate<->pipe table from
386 * some TBD location.
387 * note: it doesn't seem possible to get the chip
388 * currently open gate/pipe table.
389 * It is only possible to obtain the supported
390 * gate list.
391 */
392
393 /* goto exit
394 * For now, always do a full initialization */
395 }
396
397 r = nfc_hci_disconnect_all_gates(hdev);
398 if (r < 0)
399 goto exit;
400
401 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
402 hdev->init_data.gates);
403 if (r < 0)
404 goto disconnect_all;
405
406 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
407 NFC_HCI_ADMIN_SESSION_IDENTITY,
408 hdev->init_data.session_id,
409 strlen(hdev->init_data.session_id));
410 if (r == 0)
411 goto exit;
412
413 disconnect_all:
414 nfc_hci_disconnect_all_gates(hdev);
415
416 exit:
417 kfree_skb(skb);
418
419 return r;
420 }
421
422 static int hci_dev_version(struct nfc_hci_dev *hdev)
423 {
424 int r;
425 struct sk_buff *skb;
426
427 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
428 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
429 if (r == -EOPNOTSUPP) {
430 pr_info("Software/Hardware info not available\n");
431 return 0;
432 }
433 if (r < 0)
434 return r;
435
436 if (skb->len != 3) {
437 kfree_skb(skb);
438 return -EINVAL;
439 }
440
441 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
442 hdev->sw_patch = skb->data[0] & 0x0f;
443 hdev->sw_flashlib_major = skb->data[1];
444 hdev->sw_flashlib_minor = skb->data[2];
445
446 kfree_skb(skb);
447
448 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
449 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
450 if (r < 0)
451 return r;
452
453 if (skb->len != 3) {
454 kfree_skb(skb);
455 return -EINVAL;
456 }
457
458 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
459 hdev->hw_version = skb->data[0] & 0x1f;
460 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
461 hdev->hw_software = skb->data[1] & 0x3f;
462 hdev->hw_bsid = skb->data[2];
463
464 kfree_skb(skb);
465
466 pr_info("SOFTWARE INFO:\n");
467 pr_info("RomLib : %d\n", hdev->sw_romlib);
468 pr_info("Patch : %d\n", hdev->sw_patch);
469 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
470 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
471 pr_info("HARDWARE INFO:\n");
472 pr_info("Derivative : %d\n", hdev->hw_derivative);
473 pr_info("HW Version : %d\n", hdev->hw_version);
474 pr_info("#MPW : %d\n", hdev->hw_mpw);
475 pr_info("Software : %d\n", hdev->hw_software);
476 pr_info("BSID Version : %d\n", hdev->hw_bsid);
477
478 return 0;
479 }
480
481 static int hci_dev_up(struct nfc_dev *nfc_dev)
482 {
483 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
484 int r = 0;
485
486 if (hdev->ops->open) {
487 r = hdev->ops->open(hdev);
488 if (r < 0)
489 return r;
490 }
491
492 r = nfc_llc_start(hdev->llc);
493 if (r < 0)
494 goto exit_close;
495
496 r = hci_dev_session_init(hdev);
497 if (r < 0)
498 goto exit_llc;
499
500 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
501 NFC_HCI_EVT_END_OPERATION, NULL, 0);
502 if (r < 0)
503 goto exit_llc;
504
505 if (hdev->ops->hci_ready) {
506 r = hdev->ops->hci_ready(hdev);
507 if (r < 0)
508 goto exit_llc;
509 }
510
511 r = hci_dev_version(hdev);
512 if (r < 0)
513 goto exit_llc;
514
515 return 0;
516
517 exit_llc:
518 nfc_llc_stop(hdev->llc);
519
520 exit_close:
521 if (hdev->ops->close)
522 hdev->ops->close(hdev);
523
524 return r;
525 }
526
527 static int hci_dev_down(struct nfc_dev *nfc_dev)
528 {
529 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
530
531 nfc_llc_stop(hdev->llc);
532
533 if (hdev->ops->close)
534 hdev->ops->close(hdev);
535
536 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
537
538 return 0;
539 }
540
541 static int hci_start_poll(struct nfc_dev *nfc_dev,
542 u32 im_protocols, u32 tm_protocols)
543 {
544 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
545
546 if (hdev->ops->start_poll)
547 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
548 else
549 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
550 NFC_HCI_EVT_READER_REQUESTED,
551 NULL, 0);
552 }
553
554 static void hci_stop_poll(struct nfc_dev *nfc_dev)
555 {
556 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
557
558 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
559 NFC_HCI_EVT_END_OPERATION, NULL, 0);
560 }
561
562 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
563 __u8 comm_mode, __u8 *gb, size_t gb_len)
564 {
565 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
566
567 if (hdev->ops->dep_link_up)
568 return hdev->ops->dep_link_up(hdev, target, comm_mode,
569 gb, gb_len);
570
571 return 0;
572 }
573
574 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
575 {
576 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
577
578 if (hdev->ops->dep_link_down)
579 return hdev->ops->dep_link_down(hdev);
580
581 return 0;
582 }
583
584 static int hci_activate_target(struct nfc_dev *nfc_dev,
585 struct nfc_target *target, u32 protocol)
586 {
587 return 0;
588 }
589
590 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
591 struct nfc_target *target)
592 {
593 }
594
595 #define HCI_CB_TYPE_TRANSCEIVE 1
596
597 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
598 {
599 struct nfc_hci_dev *hdev = context;
600
601 switch (hdev->async_cb_type) {
602 case HCI_CB_TYPE_TRANSCEIVE:
603 /*
604 * TODO: Check RF Error indicator to make sure data is valid.
605 * It seems that HCI cmd can complete without error, but data
606 * can be invalid if an RF error occured? Ignore for now.
607 */
608 if (err == 0)
609 skb_trim(skb, skb->len - 1); /* RF Err ind */
610
611 hdev->async_cb(hdev->async_cb_context, skb, err);
612 break;
613 default:
614 if (err == 0)
615 kfree_skb(skb);
616 break;
617 }
618 }
619
620 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
621 struct sk_buff *skb, data_exchange_cb_t cb,
622 void *cb_context)
623 {
624 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
625 int r;
626
627 pr_debug("target_idx=%d\n", target->idx);
628
629 switch (target->hci_reader_gate) {
630 case NFC_HCI_RF_READER_A_GATE:
631 case NFC_HCI_RF_READER_B_GATE:
632 if (hdev->ops->im_transceive) {
633 r = hdev->ops->im_transceive(hdev, target, skb, cb,
634 cb_context);
635 if (r <= 0) /* handled */
636 break;
637 }
638
639 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
640
641 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
642 hdev->async_cb = cb;
643 hdev->async_cb_context = cb_context;
644
645 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
646 NFC_HCI_WR_XCHG_DATA, skb->data,
647 skb->len, hci_transceive_cb, hdev);
648 break;
649 default:
650 if (hdev->ops->im_transceive) {
651 r = hdev->ops->im_transceive(hdev, target, skb, cb,
652 cb_context);
653 if (r == 1)
654 r = -ENOTSUPP;
655 } else {
656 r = -ENOTSUPP;
657 }
658 break;
659 }
660
661 kfree_skb(skb);
662
663 return r;
664 }
665
666 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
667 {
668 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
669
670 if (hdev->ops->tm_send)
671 return hdev->ops->tm_send(hdev, skb);
672 else
673 return -ENOTSUPP;
674 }
675
676 static int hci_check_presence(struct nfc_dev *nfc_dev,
677 struct nfc_target *target)
678 {
679 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
680
681 if (hdev->ops->check_presence)
682 return hdev->ops->check_presence(hdev, target);
683
684 return 0;
685 }
686
687 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
688 {
689 mutex_lock(&hdev->msg_tx_mutex);
690
691 if (hdev->cmd_pending_msg == NULL) {
692 nfc_driver_failure(hdev->ndev, err);
693 goto exit;
694 }
695
696 __nfc_hci_cmd_completion(hdev, err, NULL);
697
698 exit:
699 mutex_unlock(&hdev->msg_tx_mutex);
700 }
701
702 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
703 {
704 nfc_hci_failure(hdev, err);
705 }
706
707 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
708 {
709 struct hcp_packet *packet;
710 u8 type;
711 u8 instruction;
712 struct sk_buff *hcp_skb;
713 u8 pipe;
714 struct sk_buff *frag_skb;
715 int msg_len;
716
717 packet = (struct hcp_packet *)skb->data;
718 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
719 skb_queue_tail(&hdev->rx_hcp_frags, skb);
720 return;
721 }
722
723 /* it's the last fragment. Does it need re-aggregation? */
724 if (skb_queue_len(&hdev->rx_hcp_frags)) {
725 pipe = packet->header & NFC_HCI_FRAGMENT;
726 skb_queue_tail(&hdev->rx_hcp_frags, skb);
727
728 msg_len = 0;
729 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
730 msg_len += (frag_skb->len -
731 NFC_HCI_HCP_PACKET_HEADER_LEN);
732 }
733
734 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
735 msg_len, GFP_KERNEL);
736 if (hcp_skb == NULL) {
737 nfc_hci_failure(hdev, -ENOMEM);
738 return;
739 }
740
741 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
742
743 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
744 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
745 memcpy(skb_put(hcp_skb, msg_len),
746 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
747 msg_len);
748 }
749
750 skb_queue_purge(&hdev->rx_hcp_frags);
751 } else {
752 packet->header &= NFC_HCI_FRAGMENT;
753 hcp_skb = skb;
754 }
755
756 /* if this is a response, dispatch immediately to
757 * unblock waiting cmd context. Otherwise, enqueue to dispatch
758 * in separate context where handler can also execute command.
759 */
760 packet = (struct hcp_packet *)hcp_skb->data;
761 type = HCP_MSG_GET_TYPE(packet->message.header);
762 if (type == NFC_HCI_HCP_RESPONSE) {
763 pipe = packet->header;
764 instruction = HCP_MSG_GET_CMD(packet->message.header);
765 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
766 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
767 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
768 } else {
769 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
770 schedule_work(&hdev->msg_rx_work);
771 }
772 }
773
774 static struct nfc_ops hci_nfc_ops = {
775 .dev_up = hci_dev_up,
776 .dev_down = hci_dev_down,
777 .start_poll = hci_start_poll,
778 .stop_poll = hci_stop_poll,
779 .dep_link_up = hci_dep_link_up,
780 .dep_link_down = hci_dep_link_down,
781 .activate_target = hci_activate_target,
782 .deactivate_target = hci_deactivate_target,
783 .im_transceive = hci_transceive,
784 .tm_send = hci_tm_send,
785 .check_presence = hci_check_presence,
786 };
787
788 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
789 struct nfc_hci_init_data *init_data,
790 u32 protocols,
791 const char *llc_name,
792 int tx_headroom,
793 int tx_tailroom,
794 int max_link_payload)
795 {
796 struct nfc_hci_dev *hdev;
797
798 if (ops->xmit == NULL)
799 return NULL;
800
801 if (protocols == 0)
802 return NULL;
803
804 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
805 if (hdev == NULL)
806 return NULL;
807
808 hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
809 nfc_hci_recv_from_llc, tx_headroom,
810 tx_tailroom, nfc_hci_llc_failure);
811 if (hdev->llc == NULL) {
812 kfree(hdev);
813 return NULL;
814 }
815
816 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
817 tx_headroom + HCI_CMDS_HEADROOM,
818 tx_tailroom);
819 if (!hdev->ndev) {
820 nfc_llc_free(hdev->llc);
821 kfree(hdev);
822 return NULL;
823 }
824
825 hdev->ops = ops;
826 hdev->max_data_link_payload = max_link_payload;
827 hdev->init_data = *init_data;
828
829 nfc_set_drvdata(hdev->ndev, hdev);
830
831 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
832
833 return hdev;
834 }
835 EXPORT_SYMBOL(nfc_hci_allocate_device);
836
837 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
838 {
839 nfc_free_device(hdev->ndev);
840 nfc_llc_free(hdev->llc);
841 kfree(hdev);
842 }
843 EXPORT_SYMBOL(nfc_hci_free_device);
844
845 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
846 {
847 mutex_init(&hdev->msg_tx_mutex);
848
849 INIT_LIST_HEAD(&hdev->msg_tx_queue);
850
851 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
852
853 init_timer(&hdev->cmd_timer);
854 hdev->cmd_timer.data = (unsigned long)hdev;
855 hdev->cmd_timer.function = nfc_hci_cmd_timeout;
856
857 skb_queue_head_init(&hdev->rx_hcp_frags);
858
859 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
860
861 skb_queue_head_init(&hdev->msg_rx_queue);
862
863 return nfc_register_device(hdev->ndev);
864 }
865 EXPORT_SYMBOL(nfc_hci_register_device);
866
867 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
868 {
869 struct hci_msg *msg, *n;
870
871 skb_queue_purge(&hdev->rx_hcp_frags);
872 skb_queue_purge(&hdev->msg_rx_queue);
873
874 list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
875 list_del(&msg->msg_l);
876 skb_queue_purge(&msg->msg_frags);
877 kfree(msg);
878 }
879
880 del_timer_sync(&hdev->cmd_timer);
881
882 nfc_unregister_device(hdev->ndev);
883
884 cancel_work_sync(&hdev->msg_tx_work);
885 cancel_work_sync(&hdev->msg_rx_work);
886 }
887 EXPORT_SYMBOL(nfc_hci_unregister_device);
888
889 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
890 {
891 hdev->clientdata = clientdata;
892 }
893 EXPORT_SYMBOL(nfc_hci_set_clientdata);
894
895 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
896 {
897 return hdev->clientdata;
898 }
899 EXPORT_SYMBOL(nfc_hci_get_clientdata);
900
901 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
902 {
903 nfc_hci_failure(hdev, err);
904 }
905 EXPORT_SYMBOL(nfc_hci_driver_failure);
906
907 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
908 {
909 nfc_llc_rcv_from_drv(hdev->llc, skb);
910 }
911 EXPORT_SYMBOL(nfc_hci_recv_frame);
912
913 static int __init nfc_hci_init(void)
914 {
915 return nfc_llc_init();
916 }
917
918 static void __exit nfc_hci_exit(void)
919 {
920 nfc_llc_exit();
921 }
922
923 subsys_initcall(nfc_hci_init);
924 module_exit(nfc_hci_exit);
925
926 MODULE_LICENSE("GPL");
927 MODULE_DESCRIPTION("NFC HCI Core");
CRIS linux kernel tree