xref: /openbmc/linux/net/nfc/hci/core.c (revision f2479c0a)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2012  Intel Corporation. All rights reserved.
4  */
5 
6 #define pr_fmt(fmt) "hci: %s: " fmt, __func__
7 
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/nfc.h>
12 
13 #include <net/nfc/nfc.h>
14 #include <net/nfc/hci.h>
15 #include <net/nfc/llc.h>
16 
17 #include "hci.h"
18 
19 /* Largest headroom needed for outgoing HCI commands */
20 #define HCI_CMDS_HEADROOM 1
21 
nfc_hci_result_to_errno(u8 result)22 int nfc_hci_result_to_errno(u8 result)
23 {
24 	switch (result) {
25 	case NFC_HCI_ANY_OK:
26 		return 0;
27 	case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
28 		return -EOPNOTSUPP;
29 	case NFC_HCI_ANY_E_TIMEOUT:
30 		return -ETIME;
31 	default:
32 		return -1;
33 	}
34 }
35 EXPORT_SYMBOL(nfc_hci_result_to_errno);
36 
nfc_hci_reset_pipes(struct nfc_hci_dev * hdev)37 void nfc_hci_reset_pipes(struct nfc_hci_dev *hdev)
38 {
39 	int i = 0;
40 
41 	for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
42 		hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
43 		hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
44 	}
45 	memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
46 }
47 EXPORT_SYMBOL(nfc_hci_reset_pipes);
48 
nfc_hci_reset_pipes_per_host(struct nfc_hci_dev * hdev,u8 host)49 void nfc_hci_reset_pipes_per_host(struct nfc_hci_dev *hdev, u8 host)
50 {
51 	int i = 0;
52 
53 	for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
54 		if (hdev->pipes[i].dest_host != host)
55 			continue;
56 
57 		hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
58 		hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
59 	}
60 }
61 EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
62 
nfc_hci_msg_tx_work(struct work_struct * work)63 static void nfc_hci_msg_tx_work(struct work_struct *work)
64 {
65 	struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
66 						msg_tx_work);
67 	struct hci_msg *msg;
68 	struct sk_buff *skb;
69 	int r = 0;
70 
71 	mutex_lock(&hdev->msg_tx_mutex);
72 	if (hdev->shutting_down)
73 		goto exit;
74 
75 	if (hdev->cmd_pending_msg) {
76 		if (timer_pending(&hdev->cmd_timer) == 0) {
77 			if (hdev->cmd_pending_msg->cb)
78 				hdev->cmd_pending_msg->cb(hdev->
79 							  cmd_pending_msg->
80 							  cb_context,
81 							  NULL,
82 							  -ETIME);
83 			kfree(hdev->cmd_pending_msg);
84 			hdev->cmd_pending_msg = NULL;
85 		} else {
86 			goto exit;
87 		}
88 	}
89 
90 next_msg:
91 	if (list_empty(&hdev->msg_tx_queue))
92 		goto exit;
93 
94 	msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
95 	list_del(&msg->msg_l);
96 
97 	pr_debug("msg_tx_queue has a cmd to send\n");
98 	while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
99 		r = nfc_llc_xmit_from_hci(hdev->llc, skb);
100 		if (r < 0) {
101 			kfree_skb(skb);
102 			skb_queue_purge(&msg->msg_frags);
103 			if (msg->cb)
104 				msg->cb(msg->cb_context, NULL, r);
105 			kfree(msg);
106 			break;
107 		}
108 	}
109 
110 	if (r)
111 		goto next_msg;
112 
113 	if (msg->wait_response == false) {
114 		kfree(msg);
115 		goto next_msg;
116 	}
117 
118 	hdev->cmd_pending_msg = msg;
119 	mod_timer(&hdev->cmd_timer, jiffies +
120 		  msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
121 
122 exit:
123 	mutex_unlock(&hdev->msg_tx_mutex);
124 }
125 
nfc_hci_msg_rx_work(struct work_struct * work)126 static void nfc_hci_msg_rx_work(struct work_struct *work)
127 {
128 	struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
129 						msg_rx_work);
130 	struct sk_buff *skb;
131 	const struct hcp_message *message;
132 	u8 pipe;
133 	u8 type;
134 	u8 instruction;
135 
136 	while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
137 		pipe = skb->data[0];
138 		skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
139 		message = (struct hcp_message *)skb->data;
140 		type = HCP_MSG_GET_TYPE(message->header);
141 		instruction = HCP_MSG_GET_CMD(message->header);
142 		skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
143 
144 		nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
145 	}
146 }
147 
__nfc_hci_cmd_completion(struct nfc_hci_dev * hdev,int err,struct sk_buff * skb)148 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
149 				     struct sk_buff *skb)
150 {
151 	del_timer_sync(&hdev->cmd_timer);
152 
153 	if (hdev->cmd_pending_msg->cb)
154 		hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
155 					  skb, err);
156 	else
157 		kfree_skb(skb);
158 
159 	kfree(hdev->cmd_pending_msg);
160 	hdev->cmd_pending_msg = NULL;
161 
162 	schedule_work(&hdev->msg_tx_work);
163 }
164 
nfc_hci_resp_received(struct nfc_hci_dev * hdev,u8 result,struct sk_buff * skb)165 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
166 			   struct sk_buff *skb)
167 {
168 	mutex_lock(&hdev->msg_tx_mutex);
169 
170 	if (hdev->cmd_pending_msg == NULL) {
171 		kfree_skb(skb);
172 		goto exit;
173 	}
174 
175 	__nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
176 
177 exit:
178 	mutex_unlock(&hdev->msg_tx_mutex);
179 }
180 
nfc_hci_cmd_received(struct nfc_hci_dev * hdev,u8 pipe,u8 cmd,struct sk_buff * skb)181 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
182 			  struct sk_buff *skb)
183 {
184 	u8 status = NFC_HCI_ANY_OK;
185 	const struct hci_create_pipe_resp *create_info;
186 	const struct hci_delete_pipe_noti *delete_info;
187 	const struct hci_all_pipe_cleared_noti *cleared_info;
188 	u8 gate;
189 
190 	pr_debug("from pipe %x cmd %x\n", pipe, cmd);
191 
192 	if (pipe >= NFC_HCI_MAX_PIPES) {
193 		status = NFC_HCI_ANY_E_NOK;
194 		goto exit;
195 	}
196 
197 	gate = hdev->pipes[pipe].gate;
198 
199 	switch (cmd) {
200 	case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
201 		if (skb->len != 5) {
202 			status = NFC_HCI_ANY_E_NOK;
203 			goto exit;
204 		}
205 		create_info = (struct hci_create_pipe_resp *)skb->data;
206 
207 		if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
208 			status = NFC_HCI_ANY_E_NOK;
209 			goto exit;
210 		}
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 		if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
236 			status = NFC_HCI_ANY_E_NOK;
237 			goto exit;
238 		}
239 
240 		hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
241 		hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
242 		break;
243 	case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
244 		if (skb->len != 1) {
245 			status = NFC_HCI_ANY_E_NOK;
246 			goto exit;
247 		}
248 		cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
249 
250 		nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
251 		break;
252 	default:
253 		pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
254 		break;
255 	}
256 
257 	if (hdev->ops->cmd_received)
258 		hdev->ops->cmd_received(hdev, pipe, cmd, skb);
259 
260 exit:
261 	nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
262 			       status, NULL, 0, NULL, NULL, 0);
263 
264 	kfree_skb(skb);
265 }
266 
nfc_hci_sak_to_protocol(u8 sak)267 u32 nfc_hci_sak_to_protocol(u8 sak)
268 {
269 	switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
270 	case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
271 		return NFC_PROTO_MIFARE_MASK;
272 	case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
273 		return NFC_PROTO_ISO14443_MASK;
274 	case NFC_HCI_TYPE_A_SEL_PROT_DEP:
275 		return NFC_PROTO_NFC_DEP_MASK;
276 	case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
277 		return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
278 	default:
279 		return 0xffffffff;
280 	}
281 }
282 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
283 
nfc_hci_target_discovered(struct nfc_hci_dev * hdev,u8 gate)284 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
285 {
286 	struct nfc_target *targets;
287 	struct sk_buff *atqa_skb = NULL;
288 	struct sk_buff *sak_skb = NULL;
289 	struct sk_buff *uid_skb = NULL;
290 	int r;
291 
292 	pr_debug("from gate %d\n", gate);
293 
294 	targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
295 	if (targets == NULL)
296 		return -ENOMEM;
297 
298 	switch (gate) {
299 	case NFC_HCI_RF_READER_A_GATE:
300 		r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
301 				      NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
302 		if (r < 0)
303 			goto exit;
304 
305 		r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
306 				      NFC_HCI_RF_READER_A_SAK, &sak_skb);
307 		if (r < 0)
308 			goto exit;
309 
310 		if (atqa_skb->len != 2 || sak_skb->len != 1) {
311 			r = -EPROTO;
312 			goto exit;
313 		}
314 
315 		targets->supported_protocols =
316 				nfc_hci_sak_to_protocol(sak_skb->data[0]);
317 		if (targets->supported_protocols == 0xffffffff) {
318 			r = -EPROTO;
319 			goto exit;
320 		}
321 
322 		targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
323 		targets->sel_res = sak_skb->data[0];
324 
325 		r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
326 				      NFC_HCI_RF_READER_A_UID, &uid_skb);
327 		if (r < 0)
328 			goto exit;
329 
330 		if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
331 			r = -EPROTO;
332 			goto exit;
333 		}
334 
335 		memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
336 		targets->nfcid1_len = uid_skb->len;
337 
338 		if (hdev->ops->complete_target_discovered) {
339 			r = hdev->ops->complete_target_discovered(hdev, gate,
340 								  targets);
341 			if (r < 0)
342 				goto exit;
343 		}
344 		break;
345 	case NFC_HCI_RF_READER_B_GATE:
346 		targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
347 		break;
348 	default:
349 		if (hdev->ops->target_from_gate)
350 			r = hdev->ops->target_from_gate(hdev, gate, targets);
351 		else
352 			r = -EPROTO;
353 		if (r < 0)
354 			goto exit;
355 
356 		if (hdev->ops->complete_target_discovered) {
357 			r = hdev->ops->complete_target_discovered(hdev, gate,
358 								  targets);
359 			if (r < 0)
360 				goto exit;
361 		}
362 		break;
363 	}
364 
365 	/* if driver set the new gate, we will skip the old one */
366 	if (targets->hci_reader_gate == 0x00)
367 		targets->hci_reader_gate = gate;
368 
369 	r = nfc_targets_found(hdev->ndev, targets, 1);
370 
371 exit:
372 	kfree(targets);
373 	kfree_skb(atqa_skb);
374 	kfree_skb(sak_skb);
375 	kfree_skb(uid_skb);
376 
377 	return r;
378 }
379 EXPORT_SYMBOL(nfc_hci_target_discovered);
380 
nfc_hci_event_received(struct nfc_hci_dev * hdev,u8 pipe,u8 event,struct sk_buff * skb)381 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
382 			    struct sk_buff *skb)
383 {
384 	int r = 0;
385 	u8 gate;
386 
387 	if (pipe >= NFC_HCI_MAX_PIPES) {
388 		pr_err("Discarded event %x to invalid pipe %x\n", event, pipe);
389 		goto exit;
390 	}
391 
392 	gate = hdev->pipes[pipe].gate;
393 	if (gate == NFC_HCI_INVALID_GATE) {
394 		pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
395 		goto exit;
396 	}
397 
398 	if (hdev->ops->event_received) {
399 		r = hdev->ops->event_received(hdev, pipe, event, skb);
400 		if (r <= 0)
401 			goto exit_noskb;
402 	}
403 
404 	switch (event) {
405 	case NFC_HCI_EVT_TARGET_DISCOVERED:
406 		if (skb->len < 1) {	/* no status data? */
407 			r = -EPROTO;
408 			goto exit;
409 		}
410 
411 		if (skb->data[0] == 3) {
412 			/* TODO: Multiple targets in field, none activated
413 			 * poll is supposedly stopped, but there is no
414 			 * single target to activate, so nothing to report
415 			 * up.
416 			 * if we need to restart poll, we must save the
417 			 * protocols from the initial poll and reuse here.
418 			 */
419 		}
420 
421 		if (skb->data[0] != 0) {
422 			r = -EPROTO;
423 			goto exit;
424 		}
425 
426 		r = nfc_hci_target_discovered(hdev, gate);
427 		break;
428 	default:
429 		pr_info("Discarded unknown event %x to gate %x\n", event, gate);
430 		r = -EINVAL;
431 		break;
432 	}
433 
434 exit:
435 	kfree_skb(skb);
436 
437 exit_noskb:
438 	if (r)
439 		nfc_hci_driver_failure(hdev, r);
440 }
441 
nfc_hci_cmd_timeout(struct timer_list * t)442 static void nfc_hci_cmd_timeout(struct timer_list *t)
443 {
444 	struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
445 
446 	schedule_work(&hdev->msg_tx_work);
447 }
448 
hci_dev_connect_gates(struct nfc_hci_dev * hdev,u8 gate_count,const struct nfc_hci_gate * gates)449 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
450 				 const struct nfc_hci_gate *gates)
451 {
452 	int r;
453 	while (gate_count--) {
454 		r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
455 					 gates->gate, gates->pipe);
456 		if (r < 0)
457 			return r;
458 		gates++;
459 	}
460 
461 	return 0;
462 }
463 
hci_dev_session_init(struct nfc_hci_dev * hdev)464 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
465 {
466 	struct sk_buff *skb = NULL;
467 	int r;
468 
469 	if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
470 		return -EPROTO;
471 
472 	r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
473 				 hdev->init_data.gates[0].gate,
474 				 hdev->init_data.gates[0].pipe);
475 	if (r < 0)
476 		goto exit;
477 
478 	r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
479 			      NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
480 	if (r < 0)
481 		goto disconnect_all;
482 
483 	if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
484 		(memcmp(hdev->init_data.session_id, skb->data,
485 			   skb->len) == 0) && hdev->ops->load_session) {
486 		/* Restore gate<->pipe table from some proprietary location. */
487 
488 		r = hdev->ops->load_session(hdev);
489 
490 		if (r < 0)
491 			goto disconnect_all;
492 	} else {
493 
494 		r = nfc_hci_disconnect_all_gates(hdev);
495 		if (r < 0)
496 			goto exit;
497 
498 		r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
499 					  hdev->init_data.gates);
500 		if (r < 0)
501 			goto disconnect_all;
502 
503 		r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
504 				NFC_HCI_ADMIN_SESSION_IDENTITY,
505 				hdev->init_data.session_id,
506 				strlen(hdev->init_data.session_id));
507 	}
508 	if (r == 0)
509 		goto exit;
510 
511 disconnect_all:
512 	nfc_hci_disconnect_all_gates(hdev);
513 
514 exit:
515 	kfree_skb(skb);
516 
517 	return r;
518 }
519 
hci_dev_version(struct nfc_hci_dev * hdev)520 static int hci_dev_version(struct nfc_hci_dev *hdev)
521 {
522 	int r;
523 	struct sk_buff *skb;
524 
525 	r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
526 			      NFC_HCI_ID_MGMT_VERSION_SW, &skb);
527 	if (r == -EOPNOTSUPP) {
528 		pr_info("Software/Hardware info not available\n");
529 		return 0;
530 	}
531 	if (r < 0)
532 		return r;
533 
534 	if (skb->len != 3) {
535 		kfree_skb(skb);
536 		return -EINVAL;
537 	}
538 
539 	hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
540 	hdev->sw_patch = skb->data[0] & 0x0f;
541 	hdev->sw_flashlib_major = skb->data[1];
542 	hdev->sw_flashlib_minor = skb->data[2];
543 
544 	kfree_skb(skb);
545 
546 	r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
547 			      NFC_HCI_ID_MGMT_VERSION_HW, &skb);
548 	if (r < 0)
549 		return r;
550 
551 	if (skb->len != 3) {
552 		kfree_skb(skb);
553 		return -EINVAL;
554 	}
555 
556 	hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
557 	hdev->hw_version = skb->data[0] & 0x1f;
558 	hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
559 	hdev->hw_software = skb->data[1] & 0x3f;
560 	hdev->hw_bsid = skb->data[2];
561 
562 	kfree_skb(skb);
563 
564 	pr_info("SOFTWARE INFO:\n");
565 	pr_info("RomLib         : %d\n", hdev->sw_romlib);
566 	pr_info("Patch          : %d\n", hdev->sw_patch);
567 	pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
568 	pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
569 	pr_info("HARDWARE INFO:\n");
570 	pr_info("Derivative     : %d\n", hdev->hw_derivative);
571 	pr_info("HW Version     : %d\n", hdev->hw_version);
572 	pr_info("#MPW           : %d\n", hdev->hw_mpw);
573 	pr_info("Software       : %d\n", hdev->hw_software);
574 	pr_info("BSID Version   : %d\n", hdev->hw_bsid);
575 
576 	return 0;
577 }
578 
hci_dev_up(struct nfc_dev * nfc_dev)579 static int hci_dev_up(struct nfc_dev *nfc_dev)
580 {
581 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
582 	int r = 0;
583 
584 	if (hdev->ops->open) {
585 		r = hdev->ops->open(hdev);
586 		if (r < 0)
587 			return r;
588 	}
589 
590 	r = nfc_llc_start(hdev->llc);
591 	if (r < 0)
592 		goto exit_close;
593 
594 	r = hci_dev_session_init(hdev);
595 	if (r < 0)
596 		goto exit_llc;
597 
598 	r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
599 			       NFC_HCI_EVT_END_OPERATION, NULL, 0);
600 	if (r < 0)
601 		goto exit_llc;
602 
603 	if (hdev->ops->hci_ready) {
604 		r = hdev->ops->hci_ready(hdev);
605 		if (r < 0)
606 			goto exit_llc;
607 	}
608 
609 	r = hci_dev_version(hdev);
610 	if (r < 0)
611 		goto exit_llc;
612 
613 	return 0;
614 
615 exit_llc:
616 	nfc_llc_stop(hdev->llc);
617 
618 exit_close:
619 	if (hdev->ops->close)
620 		hdev->ops->close(hdev);
621 
622 	return r;
623 }
624 
hci_dev_down(struct nfc_dev * nfc_dev)625 static int hci_dev_down(struct nfc_dev *nfc_dev)
626 {
627 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
628 
629 	nfc_llc_stop(hdev->llc);
630 
631 	if (hdev->ops->close)
632 		hdev->ops->close(hdev);
633 
634 	nfc_hci_reset_pipes(hdev);
635 
636 	return 0;
637 }
638 
hci_start_poll(struct nfc_dev * nfc_dev,u32 im_protocols,u32 tm_protocols)639 static int hci_start_poll(struct nfc_dev *nfc_dev,
640 			  u32 im_protocols, u32 tm_protocols)
641 {
642 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
643 
644 	if (hdev->ops->start_poll)
645 		return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
646 	else
647 		return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
648 					  NFC_HCI_EVT_READER_REQUESTED,
649 					  NULL, 0);
650 }
651 
hci_stop_poll(struct nfc_dev * nfc_dev)652 static void hci_stop_poll(struct nfc_dev *nfc_dev)
653 {
654 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
655 
656 	if (hdev->ops->stop_poll)
657 		hdev->ops->stop_poll(hdev);
658 	else
659 		nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
660 				   NFC_HCI_EVT_END_OPERATION, NULL, 0);
661 }
662 
hci_dep_link_up(struct nfc_dev * nfc_dev,struct nfc_target * target,__u8 comm_mode,__u8 * gb,size_t gb_len)663 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
664 				__u8 comm_mode, __u8 *gb, size_t gb_len)
665 {
666 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
667 
668 	if (!hdev->ops->dep_link_up)
669 		return 0;
670 
671 	return hdev->ops->dep_link_up(hdev, target, comm_mode,
672 				      gb, gb_len);
673 }
674 
hci_dep_link_down(struct nfc_dev * nfc_dev)675 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
676 {
677 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
678 
679 	if (!hdev->ops->dep_link_down)
680 		return 0;
681 
682 	return hdev->ops->dep_link_down(hdev);
683 }
684 
hci_activate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u32 protocol)685 static int hci_activate_target(struct nfc_dev *nfc_dev,
686 			       struct nfc_target *target, u32 protocol)
687 {
688 	return 0;
689 }
690 
hci_deactivate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u8 mode)691 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
692 				  struct nfc_target *target,
693 				  u8 mode)
694 {
695 }
696 
697 #define HCI_CB_TYPE_TRANSCEIVE 1
698 
hci_transceive_cb(void * context,struct sk_buff * skb,int err)699 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
700 {
701 	struct nfc_hci_dev *hdev = context;
702 
703 	switch (hdev->async_cb_type) {
704 	case HCI_CB_TYPE_TRANSCEIVE:
705 		/*
706 		 * TODO: Check RF Error indicator to make sure data is valid.
707 		 * It seems that HCI cmd can complete without error, but data
708 		 * can be invalid if an RF error occurred? Ignore for now.
709 		 */
710 		if (err == 0)
711 			skb_trim(skb, skb->len - 1); /* RF Err ind */
712 
713 		hdev->async_cb(hdev->async_cb_context, skb, err);
714 		break;
715 	default:
716 		if (err == 0)
717 			kfree_skb(skb);
718 		break;
719 	}
720 }
721 
hci_transceive(struct nfc_dev * nfc_dev,struct nfc_target * target,struct sk_buff * skb,data_exchange_cb_t cb,void * cb_context)722 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
723 			  struct sk_buff *skb, data_exchange_cb_t cb,
724 			  void *cb_context)
725 {
726 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
727 	int r;
728 
729 	pr_debug("target_idx=%d\n", target->idx);
730 
731 	switch (target->hci_reader_gate) {
732 	case NFC_HCI_RF_READER_A_GATE:
733 	case NFC_HCI_RF_READER_B_GATE:
734 		if (hdev->ops->im_transceive) {
735 			r = hdev->ops->im_transceive(hdev, target, skb, cb,
736 						     cb_context);
737 			if (r <= 0)	/* handled */
738 				break;
739 		}
740 
741 		*(u8 *)skb_push(skb, 1) = 0;	/* CTR, see spec:10.2.2.1 */
742 
743 		hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
744 		hdev->async_cb = cb;
745 		hdev->async_cb_context = cb_context;
746 
747 		r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
748 					   NFC_HCI_WR_XCHG_DATA, skb->data,
749 					   skb->len, hci_transceive_cb, hdev);
750 		break;
751 	default:
752 		if (hdev->ops->im_transceive) {
753 			r = hdev->ops->im_transceive(hdev, target, skb, cb,
754 						     cb_context);
755 			if (r == 1)
756 				r = -ENOTSUPP;
757 		} else {
758 			r = -ENOTSUPP;
759 		}
760 		break;
761 	}
762 
763 	kfree_skb(skb);
764 
765 	return r;
766 }
767 
hci_tm_send(struct nfc_dev * nfc_dev,struct sk_buff * skb)768 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
769 {
770 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
771 
772 	if (!hdev->ops->tm_send) {
773 		kfree_skb(skb);
774 		return -ENOTSUPP;
775 	}
776 
777 	return hdev->ops->tm_send(hdev, skb);
778 }
779 
hci_check_presence(struct nfc_dev * nfc_dev,struct nfc_target * target)780 static int hci_check_presence(struct nfc_dev *nfc_dev,
781 			      struct nfc_target *target)
782 {
783 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
784 
785 	if (!hdev->ops->check_presence)
786 		return 0;
787 
788 	return hdev->ops->check_presence(hdev, target);
789 }
790 
hci_discover_se(struct nfc_dev * nfc_dev)791 static int hci_discover_se(struct nfc_dev *nfc_dev)
792 {
793 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
794 
795 	if (hdev->ops->discover_se)
796 		return hdev->ops->discover_se(hdev);
797 
798 	return 0;
799 }
800 
hci_enable_se(struct nfc_dev * nfc_dev,u32 se_idx)801 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
802 {
803 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
804 
805 	if (hdev->ops->enable_se)
806 		return hdev->ops->enable_se(hdev, se_idx);
807 
808 	return 0;
809 }
810 
hci_disable_se(struct nfc_dev * nfc_dev,u32 se_idx)811 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
812 {
813 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
814 
815 	if (hdev->ops->disable_se)
816 		return hdev->ops->disable_se(hdev, se_idx);
817 
818 	return 0;
819 }
820 
hci_se_io(struct nfc_dev * nfc_dev,u32 se_idx,u8 * apdu,size_t apdu_length,se_io_cb_t cb,void * cb_context)821 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
822 		     u8 *apdu, size_t apdu_length,
823 		     se_io_cb_t cb, void *cb_context)
824 {
825 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
826 
827 	if (hdev->ops->se_io)
828 		return hdev->ops->se_io(hdev, se_idx, apdu,
829 					apdu_length, cb, cb_context);
830 
831 	return 0;
832 }
833 
nfc_hci_failure(struct nfc_hci_dev * hdev,int err)834 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
835 {
836 	mutex_lock(&hdev->msg_tx_mutex);
837 
838 	if (hdev->cmd_pending_msg == NULL) {
839 		nfc_driver_failure(hdev->ndev, err);
840 		goto exit;
841 	}
842 
843 	__nfc_hci_cmd_completion(hdev, err, NULL);
844 
845 exit:
846 	mutex_unlock(&hdev->msg_tx_mutex);
847 }
848 
nfc_hci_llc_failure(struct nfc_hci_dev * hdev,int err)849 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
850 {
851 	nfc_hci_failure(hdev, err);
852 }
853 
nfc_hci_recv_from_llc(struct nfc_hci_dev * hdev,struct sk_buff * skb)854 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
855 {
856 	struct hcp_packet *packet;
857 	u8 type;
858 	u8 instruction;
859 	struct sk_buff *hcp_skb;
860 	u8 pipe;
861 	struct sk_buff *frag_skb;
862 	int msg_len;
863 
864 	packet = (struct hcp_packet *)skb->data;
865 	if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
866 		skb_queue_tail(&hdev->rx_hcp_frags, skb);
867 		return;
868 	}
869 
870 	/* it's the last fragment. Does it need re-aggregation? */
871 	if (skb_queue_len(&hdev->rx_hcp_frags)) {
872 		pipe = packet->header & NFC_HCI_FRAGMENT;
873 		skb_queue_tail(&hdev->rx_hcp_frags, skb);
874 
875 		msg_len = 0;
876 		skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
877 			msg_len += (frag_skb->len -
878 				    NFC_HCI_HCP_PACKET_HEADER_LEN);
879 		}
880 
881 		hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
882 					     msg_len, GFP_KERNEL);
883 		if (hcp_skb == NULL) {
884 			nfc_hci_failure(hdev, -ENOMEM);
885 			return;
886 		}
887 
888 		skb_put_u8(hcp_skb, pipe);
889 
890 		skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
891 			msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
892 			skb_put_data(hcp_skb,
893 				     frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
894 				     msg_len);
895 		}
896 
897 		skb_queue_purge(&hdev->rx_hcp_frags);
898 	} else {
899 		packet->header &= NFC_HCI_FRAGMENT;
900 		hcp_skb = skb;
901 	}
902 
903 	/* if this is a response, dispatch immediately to
904 	 * unblock waiting cmd context. Otherwise, enqueue to dispatch
905 	 * in separate context where handler can also execute command.
906 	 */
907 	packet = (struct hcp_packet *)hcp_skb->data;
908 	type = HCP_MSG_GET_TYPE(packet->message.header);
909 	if (type == NFC_HCI_HCP_RESPONSE) {
910 		pipe = packet->header;
911 		instruction = HCP_MSG_GET_CMD(packet->message.header);
912 		skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
913 			 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
914 		nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
915 	} else {
916 		skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
917 		schedule_work(&hdev->msg_rx_work);
918 	}
919 }
920 
hci_fw_download(struct nfc_dev * nfc_dev,const char * firmware_name)921 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
922 {
923 	struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
924 
925 	if (!hdev->ops->fw_download)
926 		return -ENOTSUPP;
927 
928 	return hdev->ops->fw_download(hdev, firmware_name);
929 }
930 
931 static const struct nfc_ops hci_nfc_ops = {
932 	.dev_up = hci_dev_up,
933 	.dev_down = hci_dev_down,
934 	.start_poll = hci_start_poll,
935 	.stop_poll = hci_stop_poll,
936 	.dep_link_up = hci_dep_link_up,
937 	.dep_link_down = hci_dep_link_down,
938 	.activate_target = hci_activate_target,
939 	.deactivate_target = hci_deactivate_target,
940 	.im_transceive = hci_transceive,
941 	.tm_send = hci_tm_send,
942 	.check_presence = hci_check_presence,
943 	.fw_download = hci_fw_download,
944 	.discover_se = hci_discover_se,
945 	.enable_se = hci_enable_se,
946 	.disable_se = hci_disable_se,
947 	.se_io = hci_se_io,
948 };
949 
nfc_hci_allocate_device(const struct nfc_hci_ops * ops,struct nfc_hci_init_data * init_data,unsigned long quirks,u32 protocols,const char * llc_name,int tx_headroom,int tx_tailroom,int max_link_payload)950 struct nfc_hci_dev *nfc_hci_allocate_device(const struct nfc_hci_ops *ops,
951 					    struct nfc_hci_init_data *init_data,
952 					    unsigned long quirks,
953 					    u32 protocols,
954 					    const char *llc_name,
955 					    int tx_headroom,
956 					    int tx_tailroom,
957 					    int max_link_payload)
958 {
959 	struct nfc_hci_dev *hdev;
960 
961 	if (ops->xmit == NULL)
962 		return NULL;
963 
964 	if (protocols == 0)
965 		return NULL;
966 
967 	hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
968 	if (hdev == NULL)
969 		return NULL;
970 
971 	hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
972 				     nfc_hci_recv_from_llc, tx_headroom,
973 				     tx_tailroom, nfc_hci_llc_failure);
974 	if (hdev->llc == NULL) {
975 		kfree(hdev);
976 		return NULL;
977 	}
978 
979 	hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
980 					 tx_headroom + HCI_CMDS_HEADROOM,
981 					 tx_tailroom);
982 	if (!hdev->ndev) {
983 		nfc_llc_free(hdev->llc);
984 		kfree(hdev);
985 		return NULL;
986 	}
987 
988 	hdev->ops = ops;
989 	hdev->max_data_link_payload = max_link_payload;
990 	hdev->init_data = *init_data;
991 
992 	nfc_set_drvdata(hdev->ndev, hdev);
993 
994 	nfc_hci_reset_pipes(hdev);
995 
996 	hdev->quirks = quirks;
997 
998 	return hdev;
999 }
1000 EXPORT_SYMBOL(nfc_hci_allocate_device);
1001 
nfc_hci_free_device(struct nfc_hci_dev * hdev)1002 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
1003 {
1004 	nfc_free_device(hdev->ndev);
1005 	nfc_llc_free(hdev->llc);
1006 	kfree(hdev);
1007 }
1008 EXPORT_SYMBOL(nfc_hci_free_device);
1009 
nfc_hci_register_device(struct nfc_hci_dev * hdev)1010 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
1011 {
1012 	mutex_init(&hdev->msg_tx_mutex);
1013 
1014 	INIT_LIST_HEAD(&hdev->msg_tx_queue);
1015 
1016 	INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1017 
1018 	timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
1019 
1020 	skb_queue_head_init(&hdev->rx_hcp_frags);
1021 
1022 	INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1023 
1024 	skb_queue_head_init(&hdev->msg_rx_queue);
1025 
1026 	return nfc_register_device(hdev->ndev);
1027 }
1028 EXPORT_SYMBOL(nfc_hci_register_device);
1029 
nfc_hci_unregister_device(struct nfc_hci_dev * hdev)1030 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1031 {
1032 	struct hci_msg *msg, *n;
1033 
1034 	mutex_lock(&hdev->msg_tx_mutex);
1035 
1036 	if (hdev->cmd_pending_msg) {
1037 		if (hdev->cmd_pending_msg->cb)
1038 			hdev->cmd_pending_msg->cb(
1039 					     hdev->cmd_pending_msg->cb_context,
1040 					     NULL, -ESHUTDOWN);
1041 		kfree(hdev->cmd_pending_msg);
1042 		hdev->cmd_pending_msg = NULL;
1043 	}
1044 
1045 	hdev->shutting_down = true;
1046 
1047 	mutex_unlock(&hdev->msg_tx_mutex);
1048 
1049 	del_timer_sync(&hdev->cmd_timer);
1050 	cancel_work_sync(&hdev->msg_tx_work);
1051 
1052 	cancel_work_sync(&hdev->msg_rx_work);
1053 
1054 	nfc_unregister_device(hdev->ndev);
1055 
1056 	skb_queue_purge(&hdev->rx_hcp_frags);
1057 	skb_queue_purge(&hdev->msg_rx_queue);
1058 
1059 	list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1060 		list_del(&msg->msg_l);
1061 		skb_queue_purge(&msg->msg_frags);
1062 		kfree(msg);
1063 	}
1064 }
1065 EXPORT_SYMBOL(nfc_hci_unregister_device);
1066 
nfc_hci_set_clientdata(struct nfc_hci_dev * hdev,void * clientdata)1067 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1068 {
1069 	hdev->clientdata = clientdata;
1070 }
1071 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1072 
nfc_hci_get_clientdata(struct nfc_hci_dev * hdev)1073 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1074 {
1075 	return hdev->clientdata;
1076 }
1077 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1078 
nfc_hci_driver_failure(struct nfc_hci_dev * hdev,int err)1079 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1080 {
1081 	nfc_hci_failure(hdev, err);
1082 }
1083 EXPORT_SYMBOL(nfc_hci_driver_failure);
1084 
nfc_hci_recv_frame(struct nfc_hci_dev * hdev,struct sk_buff * skb)1085 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1086 {
1087 	nfc_llc_rcv_from_drv(hdev->llc, skb);
1088 }
1089 EXPORT_SYMBOL(nfc_hci_recv_frame);
1090 
nfc_hci_init(void)1091 static int __init nfc_hci_init(void)
1092 {
1093 	return nfc_llc_init();
1094 }
1095 
nfc_hci_exit(void)1096 static void __exit nfc_hci_exit(void)
1097 {
1098 	nfc_llc_exit();
1099 }
1100 
1101 subsys_initcall(nfc_hci_init);
1102 module_exit(nfc_hci_exit);
1103 
1104 MODULE_LICENSE("GPL");
1105 MODULE_DESCRIPTION("NFC HCI Core");
1106