xref: /openbmc/linux/net/nfc/hci/core.c (revision 05bcf503)
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 static 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_TIMEOUT:
42 		return -ETIME;
43 	default:
44 		return -1;
45 	}
46 }
47 
48 static void nfc_hci_msg_tx_work(struct work_struct *work)
49 {
50 	struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
51 						msg_tx_work);
52 	struct hci_msg *msg;
53 	struct sk_buff *skb;
54 	int r = 0;
55 
56 	mutex_lock(&hdev->msg_tx_mutex);
57 
58 	if (hdev->cmd_pending_msg) {
59 		if (timer_pending(&hdev->cmd_timer) == 0) {
60 			if (hdev->cmd_pending_msg->cb)
61 				hdev->cmd_pending_msg->cb(hdev->
62 							  cmd_pending_msg->
63 							  cb_context,
64 							  NULL,
65 							  -ETIME);
66 			kfree(hdev->cmd_pending_msg);
67 			hdev->cmd_pending_msg = NULL;
68 		} else
69 			goto exit;
70 	}
71 
72 next_msg:
73 	if (list_empty(&hdev->msg_tx_queue))
74 		goto exit;
75 
76 	msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
77 	list_del(&msg->msg_l);
78 
79 	pr_debug("msg_tx_queue has a cmd to send\n");
80 	while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
81 		r = nfc_llc_xmit_from_hci(hdev->llc, skb);
82 		if (r < 0) {
83 			kfree_skb(skb);
84 			skb_queue_purge(&msg->msg_frags);
85 			if (msg->cb)
86 				msg->cb(msg->cb_context, NULL, r);
87 			kfree(msg);
88 			break;
89 		}
90 	}
91 
92 	if (r)
93 		goto next_msg;
94 
95 	if (msg->wait_response == false) {
96 		kfree(msg);
97 		goto next_msg;
98 	}
99 
100 	hdev->cmd_pending_msg = msg;
101 	mod_timer(&hdev->cmd_timer, jiffies +
102 		  msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
103 
104 exit:
105 	mutex_unlock(&hdev->msg_tx_mutex);
106 }
107 
108 static void nfc_hci_msg_rx_work(struct work_struct *work)
109 {
110 	struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
111 						msg_rx_work);
112 	struct sk_buff *skb;
113 	struct hcp_message *message;
114 	u8 pipe;
115 	u8 type;
116 	u8 instruction;
117 
118 	while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
119 		pipe = skb->data[0];
120 		skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
121 		message = (struct hcp_message *)skb->data;
122 		type = HCP_MSG_GET_TYPE(message->header);
123 		instruction = HCP_MSG_GET_CMD(message->header);
124 		skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
125 
126 		nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
127 	}
128 }
129 
130 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
131 				     struct sk_buff *skb)
132 {
133 	del_timer_sync(&hdev->cmd_timer);
134 
135 	if (hdev->cmd_pending_msg->cb)
136 		hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
137 					  skb, err);
138 	else
139 		kfree_skb(skb);
140 
141 	kfree(hdev->cmd_pending_msg);
142 	hdev->cmd_pending_msg = NULL;
143 
144 	schedule_work(&hdev->msg_tx_work);
145 }
146 
147 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
148 			   struct sk_buff *skb)
149 {
150 	mutex_lock(&hdev->msg_tx_mutex);
151 
152 	if (hdev->cmd_pending_msg == NULL) {
153 		kfree_skb(skb);
154 		goto exit;
155 	}
156 
157 	__nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
158 
159 exit:
160 	mutex_unlock(&hdev->msg_tx_mutex);
161 }
162 
163 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
164 			  struct sk_buff *skb)
165 {
166 	kfree_skb(skb);
167 }
168 
169 static u32 nfc_hci_sak_to_protocol(u8 sak)
170 {
171 	switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
172 	case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
173 		return NFC_PROTO_MIFARE_MASK;
174 	case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
175 		return NFC_PROTO_ISO14443_MASK;
176 	case NFC_HCI_TYPE_A_SEL_PROT_DEP:
177 		return NFC_PROTO_NFC_DEP_MASK;
178 	case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
179 		return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
180 	default:
181 		return 0xffffffff;
182 	}
183 }
184 
185 static int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
186 {
187 	struct nfc_target *targets;
188 	struct sk_buff *atqa_skb = NULL;
189 	struct sk_buff *sak_skb = NULL;
190 	struct sk_buff *uid_skb = NULL;
191 	int r;
192 
193 	pr_debug("from gate %d\n", gate);
194 
195 	targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
196 	if (targets == NULL)
197 		return -ENOMEM;
198 
199 	switch (gate) {
200 	case NFC_HCI_RF_READER_A_GATE:
201 		r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
202 				      NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
203 		if (r < 0)
204 			goto exit;
205 
206 		r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
207 				      NFC_HCI_RF_READER_A_SAK, &sak_skb);
208 		if (r < 0)
209 			goto exit;
210 
211 		if (atqa_skb->len != 2 || sak_skb->len != 1) {
212 			r = -EPROTO;
213 			goto exit;
214 		}
215 
216 		targets->supported_protocols =
217 				nfc_hci_sak_to_protocol(sak_skb->data[0]);
218 		if (targets->supported_protocols == 0xffffffff) {
219 			r = -EPROTO;
220 			goto exit;
221 		}
222 
223 		targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
224 		targets->sel_res = sak_skb->data[0];
225 
226 		r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
227 				      NFC_HCI_RF_READER_A_UID, &uid_skb);
228 		if (r < 0)
229 			goto exit;
230 
231 		if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
232 			r = -EPROTO;
233 			goto exit;
234 		}
235 
236 		memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
237 		targets->nfcid1_len = uid_skb->len;
238 
239 		if (hdev->ops->complete_target_discovered) {
240 			r = hdev->ops->complete_target_discovered(hdev, gate,
241 								  targets);
242 			if (r < 0)
243 				goto exit;
244 		}
245 		break;
246 	case NFC_HCI_RF_READER_B_GATE:
247 		targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
248 		break;
249 	default:
250 		if (hdev->ops->target_from_gate)
251 			r = hdev->ops->target_from_gate(hdev, gate, targets);
252 		else
253 			r = -EPROTO;
254 		if (r < 0)
255 			goto exit;
256 
257 		if (hdev->ops->complete_target_discovered) {
258 			r = hdev->ops->complete_target_discovered(hdev, gate,
259 								  targets);
260 			if (r < 0)
261 				goto exit;
262 		}
263 		break;
264 	}
265 
266 	targets->hci_reader_gate = gate;
267 
268 	r = nfc_targets_found(hdev->ndev, targets, 1);
269 
270 exit:
271 	kfree(targets);
272 	kfree_skb(atqa_skb);
273 	kfree_skb(sak_skb);
274 	kfree_skb(uid_skb);
275 
276 	return r;
277 }
278 
279 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
280 			    struct sk_buff *skb)
281 {
282 	int r = 0;
283 
284 	switch (event) {
285 	case NFC_HCI_EVT_TARGET_DISCOVERED:
286 		if (skb->len < 1) {	/* no status data? */
287 			r = -EPROTO;
288 			goto exit;
289 		}
290 
291 		if (skb->data[0] == 3) {
292 			/* TODO: Multiple targets in field, none activated
293 			 * poll is supposedly stopped, but there is no
294 			 * single target to activate, so nothing to report
295 			 * up.
296 			 * if we need to restart poll, we must save the
297 			 * protocols from the initial poll and reuse here.
298 			 */
299 		}
300 
301 		if (skb->data[0] != 0) {
302 			r = -EPROTO;
303 			goto exit;
304 		}
305 
306 		r = nfc_hci_target_discovered(hdev,
307 					      nfc_hci_pipe2gate(hdev, pipe));
308 		break;
309 	default:
310 		/* TODO: Unknown events are hardware specific
311 		 * pass them to the driver (needs a new hci_ops) */
312 		break;
313 	}
314 
315 exit:
316 	kfree_skb(skb);
317 
318 	if (r) {
319 		/* TODO: There was an error dispatching the event,
320 		 * how to propagate up to nfc core?
321 		 */
322 	}
323 }
324 
325 static void nfc_hci_cmd_timeout(unsigned long data)
326 {
327 	struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
328 
329 	schedule_work(&hdev->msg_tx_work);
330 }
331 
332 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
333 				 struct nfc_hci_gate *gates)
334 {
335 	int r;
336 	while (gate_count--) {
337 		r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
338 					 gates->gate, gates->pipe);
339 		if (r < 0)
340 			return r;
341 		gates++;
342 	}
343 
344 	return 0;
345 }
346 
347 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
348 {
349 	struct sk_buff *skb = NULL;
350 	int r;
351 
352 	if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
353 		return -EPROTO;
354 
355 	r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
356 				 hdev->init_data.gates[0].gate,
357 				 hdev->init_data.gates[0].pipe);
358 	if (r < 0)
359 		goto exit;
360 
361 	r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
362 			      NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
363 	if (r < 0)
364 		goto disconnect_all;
365 
366 	if (skb->len && skb->len == strlen(hdev->init_data.session_id))
367 		if (memcmp(hdev->init_data.session_id, skb->data,
368 			   skb->len) == 0) {
369 			/* TODO ELa: restore gate<->pipe table from
370 			 * some TBD location.
371 			 * note: it doesn't seem possible to get the chip
372 			 * currently open gate/pipe table.
373 			 * It is only possible to obtain the supported
374 			 * gate list.
375 			 */
376 
377 			/* goto exit
378 			 * For now, always do a full initialization */
379 		}
380 
381 	r = nfc_hci_disconnect_all_gates(hdev);
382 	if (r < 0)
383 		goto exit;
384 
385 	r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
386 				  hdev->init_data.gates);
387 	if (r < 0)
388 		goto disconnect_all;
389 
390 	r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
391 			      NFC_HCI_ADMIN_SESSION_IDENTITY,
392 			      hdev->init_data.session_id,
393 			      strlen(hdev->init_data.session_id));
394 	if (r == 0)
395 		goto exit;
396 
397 disconnect_all:
398 	nfc_hci_disconnect_all_gates(hdev);
399 
400 exit:
401 	kfree_skb(skb);
402 
403 	return r;
404 }
405 
406 static int hci_dev_version(struct nfc_hci_dev *hdev)
407 {
408 	int r;
409 	struct sk_buff *skb;
410 
411 	r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
412 			      NFC_HCI_ID_MGMT_VERSION_SW, &skb);
413 	if (r < 0)
414 		return r;
415 
416 	if (skb->len != 3) {
417 		kfree_skb(skb);
418 		return -EINVAL;
419 	}
420 
421 	hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
422 	hdev->sw_patch = skb->data[0] & 0x0f;
423 	hdev->sw_flashlib_major = skb->data[1];
424 	hdev->sw_flashlib_minor = skb->data[2];
425 
426 	kfree_skb(skb);
427 
428 	r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
429 			      NFC_HCI_ID_MGMT_VERSION_HW, &skb);
430 	if (r < 0)
431 		return r;
432 
433 	if (skb->len != 3) {
434 		kfree_skb(skb);
435 		return -EINVAL;
436 	}
437 
438 	hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
439 	hdev->hw_version = skb->data[0] & 0x1f;
440 	hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
441 	hdev->hw_software = skb->data[1] & 0x3f;
442 	hdev->hw_bsid = skb->data[2];
443 
444 	kfree_skb(skb);
445 
446 	pr_info("SOFTWARE INFO:\n");
447 	pr_info("RomLib         : %d\n", hdev->sw_romlib);
448 	pr_info("Patch          : %d\n", hdev->sw_patch);
449 	pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
450 	pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
451 	pr_info("HARDWARE INFO:\n");
452 	pr_info("Derivative     : %d\n", hdev->hw_derivative);
453 	pr_info("HW Version     : %d\n", hdev->hw_version);
454 	pr_info("#MPW           : %d\n", hdev->hw_mpw);
455 	pr_info("Software       : %d\n", hdev->hw_software);
456 	pr_info("BSID Version   : %d\n", hdev->hw_bsid);
457 
458 	return 0;
459 }
460 
461 static int hci_dev_up(struct nfc_dev *nfc_dev)
462 {
463 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
464 	int r = 0;
465 
466 	if (hdev->ops->open) {
467 		r = hdev->ops->open(hdev);
468 		if (r < 0)
469 			return r;
470 	}
471 
472 	r = nfc_llc_start(hdev->llc);
473 	if (r < 0)
474 		goto exit_close;
475 
476 	r = hci_dev_session_init(hdev);
477 	if (r < 0)
478 		goto exit_llc;
479 
480 	r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
481 			       NFC_HCI_EVT_END_OPERATION, NULL, 0);
482 	if (r < 0)
483 		goto exit_llc;
484 
485 	if (hdev->ops->hci_ready) {
486 		r = hdev->ops->hci_ready(hdev);
487 		if (r < 0)
488 			goto exit_llc;
489 	}
490 
491 	r = hci_dev_version(hdev);
492 	if (r < 0)
493 		goto exit_llc;
494 
495 	return 0;
496 
497 exit_llc:
498 	nfc_llc_stop(hdev->llc);
499 
500 exit_close:
501 	if (hdev->ops->close)
502 		hdev->ops->close(hdev);
503 
504 	return r;
505 }
506 
507 static int hci_dev_down(struct nfc_dev *nfc_dev)
508 {
509 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
510 
511 	nfc_llc_stop(hdev->llc);
512 
513 	if (hdev->ops->close)
514 		hdev->ops->close(hdev);
515 
516 	memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
517 
518 	return 0;
519 }
520 
521 static int hci_start_poll(struct nfc_dev *nfc_dev,
522 			  u32 im_protocols, u32 tm_protocols)
523 {
524 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
525 
526 	if (hdev->ops->start_poll)
527 		return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
528 	else
529 		return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
530 				       NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
531 }
532 
533 static void hci_stop_poll(struct nfc_dev *nfc_dev)
534 {
535 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
536 
537 	nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
538 			   NFC_HCI_EVT_END_OPERATION, NULL, 0);
539 }
540 
541 static int hci_activate_target(struct nfc_dev *nfc_dev,
542 			       struct nfc_target *target, u32 protocol)
543 {
544 	return 0;
545 }
546 
547 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
548 				  struct nfc_target *target)
549 {
550 }
551 
552 #define HCI_CB_TYPE_TRANSCEIVE 1
553 
554 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
555 {
556 	struct nfc_hci_dev *hdev = context;
557 
558 	switch (hdev->async_cb_type) {
559 	case HCI_CB_TYPE_TRANSCEIVE:
560 		/*
561 		 * TODO: Check RF Error indicator to make sure data is valid.
562 		 * It seems that HCI cmd can complete without error, but data
563 		 * can be invalid if an RF error occured? Ignore for now.
564 		 */
565 		if (err == 0)
566 			skb_trim(skb, skb->len - 1); /* RF Err ind */
567 
568 		hdev->async_cb(hdev->async_cb_context, skb, err);
569 		break;
570 	default:
571 		if (err == 0)
572 			kfree_skb(skb);
573 		break;
574 	}
575 }
576 
577 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
578 			  struct sk_buff *skb, data_exchange_cb_t cb,
579 			  void *cb_context)
580 {
581 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
582 	int r;
583 
584 	pr_debug("target_idx=%d\n", target->idx);
585 
586 	switch (target->hci_reader_gate) {
587 	case NFC_HCI_RF_READER_A_GATE:
588 	case NFC_HCI_RF_READER_B_GATE:
589 		if (hdev->ops->data_exchange) {
590 			r = hdev->ops->data_exchange(hdev, target, skb, cb,
591 						     cb_context);
592 			if (r <= 0)	/* handled */
593 				break;
594 		}
595 
596 		*skb_push(skb, 1) = 0;	/* CTR, see spec:10.2.2.1 */
597 
598 		hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
599 		hdev->async_cb = cb;
600 		hdev->async_cb_context = cb_context;
601 
602 		r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
603 					   NFC_HCI_WR_XCHG_DATA, skb->data,
604 					   skb->len, hci_transceive_cb, hdev);
605 		break;
606 	default:
607 		if (hdev->ops->data_exchange) {
608 			r = hdev->ops->data_exchange(hdev, target, skb, cb,
609 						     cb_context);
610 			if (r == 1)
611 				r = -ENOTSUPP;
612 		}
613 		else
614 			r = -ENOTSUPP;
615 		break;
616 	}
617 
618 	kfree_skb(skb);
619 
620 	return r;
621 }
622 
623 static int hci_check_presence(struct nfc_dev *nfc_dev,
624 			      struct nfc_target *target)
625 {
626 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
627 
628 	if (hdev->ops->check_presence)
629 		return hdev->ops->check_presence(hdev, target);
630 
631 	return 0;
632 }
633 
634 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
635 {
636 	mutex_lock(&hdev->msg_tx_mutex);
637 
638 	if (hdev->cmd_pending_msg == NULL) {
639 		nfc_driver_failure(hdev->ndev, err);
640 		goto exit;
641 	}
642 
643 	__nfc_hci_cmd_completion(hdev, err, NULL);
644 
645 exit:
646 	mutex_unlock(&hdev->msg_tx_mutex);
647 }
648 
649 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
650 {
651 	nfc_hci_failure(hdev, err);
652 }
653 
654 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
655 {
656 	struct hcp_packet *packet;
657 	u8 type;
658 	u8 instruction;
659 	struct sk_buff *hcp_skb;
660 	u8 pipe;
661 	struct sk_buff *frag_skb;
662 	int msg_len;
663 
664 	packet = (struct hcp_packet *)skb->data;
665 	if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
666 		skb_queue_tail(&hdev->rx_hcp_frags, skb);
667 		return;
668 	}
669 
670 	/* it's the last fragment. Does it need re-aggregation? */
671 	if (skb_queue_len(&hdev->rx_hcp_frags)) {
672 		pipe = packet->header & NFC_HCI_FRAGMENT;
673 		skb_queue_tail(&hdev->rx_hcp_frags, skb);
674 
675 		msg_len = 0;
676 		skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
677 			msg_len += (frag_skb->len -
678 				    NFC_HCI_HCP_PACKET_HEADER_LEN);
679 		}
680 
681 		hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
682 					     msg_len, GFP_KERNEL);
683 		if (hcp_skb == NULL) {
684 			nfc_hci_failure(hdev, -ENOMEM);
685 			return;
686 		}
687 
688 		*skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
689 
690 		skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
691 			msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
692 			memcpy(skb_put(hcp_skb, msg_len),
693 			       frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
694 			       msg_len);
695 		}
696 
697 		skb_queue_purge(&hdev->rx_hcp_frags);
698 	} else {
699 		packet->header &= NFC_HCI_FRAGMENT;
700 		hcp_skb = skb;
701 	}
702 
703 	/* if this is a response, dispatch immediately to
704 	 * unblock waiting cmd context. Otherwise, enqueue to dispatch
705 	 * in separate context where handler can also execute command.
706 	 */
707 	packet = (struct hcp_packet *)hcp_skb->data;
708 	type = HCP_MSG_GET_TYPE(packet->message.header);
709 	if (type == NFC_HCI_HCP_RESPONSE) {
710 		pipe = packet->header;
711 		instruction = HCP_MSG_GET_CMD(packet->message.header);
712 		skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
713 			 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
714 		nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
715 	} else {
716 		skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
717 		schedule_work(&hdev->msg_rx_work);
718 	}
719 }
720 
721 static struct nfc_ops hci_nfc_ops = {
722 	.dev_up = hci_dev_up,
723 	.dev_down = hci_dev_down,
724 	.start_poll = hci_start_poll,
725 	.stop_poll = hci_stop_poll,
726 	.activate_target = hci_activate_target,
727 	.deactivate_target = hci_deactivate_target,
728 	.im_transceive = hci_transceive,
729 	.check_presence = hci_check_presence,
730 };
731 
732 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
733 					    struct nfc_hci_init_data *init_data,
734 					    u32 protocols,
735 					    const char *llc_name,
736 					    int tx_headroom,
737 					    int tx_tailroom,
738 					    int max_link_payload)
739 {
740 	struct nfc_hci_dev *hdev;
741 
742 	if (ops->xmit == NULL)
743 		return NULL;
744 
745 	if (protocols == 0)
746 		return NULL;
747 
748 	hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
749 	if (hdev == NULL)
750 		return NULL;
751 
752 	hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
753 				     nfc_hci_recv_from_llc, tx_headroom,
754 				     tx_tailroom, nfc_hci_llc_failure);
755 	if (hdev->llc == NULL) {
756 		kfree(hdev);
757 		return NULL;
758 	}
759 
760 	hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
761 					 tx_headroom + HCI_CMDS_HEADROOM,
762 					 tx_tailroom);
763 	if (!hdev->ndev) {
764 		nfc_llc_free(hdev->llc);
765 		kfree(hdev);
766 		return NULL;
767 	}
768 
769 	hdev->ops = ops;
770 	hdev->max_data_link_payload = max_link_payload;
771 	hdev->init_data = *init_data;
772 
773 	nfc_set_drvdata(hdev->ndev, hdev);
774 
775 	memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
776 
777 	return hdev;
778 }
779 EXPORT_SYMBOL(nfc_hci_allocate_device);
780 
781 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
782 {
783 	nfc_free_device(hdev->ndev);
784 	nfc_llc_free(hdev->llc);
785 	kfree(hdev);
786 }
787 EXPORT_SYMBOL(nfc_hci_free_device);
788 
789 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
790 {
791 	mutex_init(&hdev->msg_tx_mutex);
792 
793 	INIT_LIST_HEAD(&hdev->msg_tx_queue);
794 
795 	INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
796 
797 	init_timer(&hdev->cmd_timer);
798 	hdev->cmd_timer.data = (unsigned long)hdev;
799 	hdev->cmd_timer.function = nfc_hci_cmd_timeout;
800 
801 	skb_queue_head_init(&hdev->rx_hcp_frags);
802 
803 	INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
804 
805 	skb_queue_head_init(&hdev->msg_rx_queue);
806 
807 	return nfc_register_device(hdev->ndev);
808 }
809 EXPORT_SYMBOL(nfc_hci_register_device);
810 
811 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
812 {
813 	struct hci_msg *msg, *n;
814 
815 	skb_queue_purge(&hdev->rx_hcp_frags);
816 	skb_queue_purge(&hdev->msg_rx_queue);
817 
818 	list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
819 		list_del(&msg->msg_l);
820 		skb_queue_purge(&msg->msg_frags);
821 		kfree(msg);
822 	}
823 
824 	del_timer_sync(&hdev->cmd_timer);
825 
826 	nfc_unregister_device(hdev->ndev);
827 
828 	cancel_work_sync(&hdev->msg_tx_work);
829 	cancel_work_sync(&hdev->msg_rx_work);
830 }
831 EXPORT_SYMBOL(nfc_hci_unregister_device);
832 
833 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
834 {
835 	hdev->clientdata = clientdata;
836 }
837 EXPORT_SYMBOL(nfc_hci_set_clientdata);
838 
839 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
840 {
841 	return hdev->clientdata;
842 }
843 EXPORT_SYMBOL(nfc_hci_get_clientdata);
844 
845 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
846 {
847 	nfc_hci_failure(hdev, err);
848 }
849 EXPORT_SYMBOL(nfc_hci_driver_failure);
850 
851 void inline nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
852 {
853 	nfc_llc_rcv_from_drv(hdev->llc, skb);
854 }
855 EXPORT_SYMBOL(nfc_hci_recv_frame);
856 
857 static int __init nfc_hci_init(void)
858 {
859 	return nfc_llc_init();
860 }
861 
862 static void __exit nfc_hci_exit(void)
863 {
864 	nfc_llc_exit();
865 }
866 
867 subsys_initcall(nfc_hci_init);
868 module_exit(nfc_hci_exit);
869 
870 MODULE_LICENSE("GPL");
871 MODULE_DESCRIPTION("NFC HCI Core");
872