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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  The NFC Controller Interface is the communication protocol between an
4  *  NFC Controller (NFCC) and a Device Host (DH).
5  *
6  *  Copyright (C) 2011 Texas Instruments, Inc.
7  *  Copyright (C) 2014 Marvell International Ltd.
8  *
9  *  Written by Ilan Elias <ilane@ti.com>
10  *
11  *  Acknowledgements:
12  *  This file is based on hci_core.c, which was written
13  *  by Maxim Krasnyansky.
14  */
15 
16 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
17 
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/types.h>
21 #include <linux/workqueue.h>
22 #include <linux/completion.h>
23 #include <linux/export.h>
24 #include <linux/sched.h>
25 #include <linux/bitops.h>
26 #include <linux/skbuff.h>
27 
28 #include "../nfc.h"
29 #include <net/nfc/nci.h>
30 #include <net/nfc/nci_core.h>
31 #include <linux/nfc.h>
32 
33 struct core_conn_create_data {
34 	int length;
35 	struct nci_core_conn_create_cmd *cmd;
36 };
37 
38 static void nci_cmd_work(struct work_struct *work);
39 static void nci_rx_work(struct work_struct *work);
40 static void nci_tx_work(struct work_struct *work);
41 
nci_get_conn_info_by_conn_id(struct nci_dev * ndev,int conn_id)42 struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev,
43 						   int conn_id)
44 {
45 	struct nci_conn_info *conn_info;
46 
47 	list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
48 		if (conn_info->conn_id == conn_id)
49 			return conn_info;
50 	}
51 
52 	return NULL;
53 }
54 
nci_get_conn_info_by_dest_type_params(struct nci_dev * ndev,u8 dest_type,struct dest_spec_params * params)55 int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type,
56 					  struct dest_spec_params *params)
57 {
58 	struct nci_conn_info *conn_info;
59 
60 	list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
61 		if (conn_info->dest_type == dest_type) {
62 			if (!params)
63 				return conn_info->conn_id;
64 
65 			if (params->id == conn_info->dest_params->id &&
66 			    params->protocol == conn_info->dest_params->protocol)
67 				return conn_info->conn_id;
68 		}
69 	}
70 
71 	return -EINVAL;
72 }
73 EXPORT_SYMBOL(nci_get_conn_info_by_dest_type_params);
74 
75 /* ---- NCI requests ---- */
76 
nci_req_complete(struct nci_dev * ndev,int result)77 void nci_req_complete(struct nci_dev *ndev, int result)
78 {
79 	if (ndev->req_status == NCI_REQ_PEND) {
80 		ndev->req_result = result;
81 		ndev->req_status = NCI_REQ_DONE;
82 		complete(&ndev->req_completion);
83 	}
84 }
85 EXPORT_SYMBOL(nci_req_complete);
86 
nci_req_cancel(struct nci_dev * ndev,int err)87 static void nci_req_cancel(struct nci_dev *ndev, int err)
88 {
89 	if (ndev->req_status == NCI_REQ_PEND) {
90 		ndev->req_result = err;
91 		ndev->req_status = NCI_REQ_CANCELED;
92 		complete(&ndev->req_completion);
93 	}
94 }
95 
96 /* Execute request and wait for completion. */
__nci_request(struct nci_dev * ndev,void (* req)(struct nci_dev * ndev,unsigned long opt),unsigned long opt,__u32 timeout)97 static int __nci_request(struct nci_dev *ndev,
98 			 void (*req)(struct nci_dev *ndev, unsigned long opt),
99 			 unsigned long opt, __u32 timeout)
100 {
101 	int rc = 0;
102 	long completion_rc;
103 
104 	ndev->req_status = NCI_REQ_PEND;
105 
106 	reinit_completion(&ndev->req_completion);
107 	req(ndev, opt);
108 	completion_rc =
109 		wait_for_completion_interruptible_timeout(&ndev->req_completion,
110 							  timeout);
111 
112 	pr_debug("wait_for_completion return %ld\n", completion_rc);
113 
114 	if (completion_rc > 0) {
115 		switch (ndev->req_status) {
116 		case NCI_REQ_DONE:
117 			rc = nci_to_errno(ndev->req_result);
118 			break;
119 
120 		case NCI_REQ_CANCELED:
121 			rc = -ndev->req_result;
122 			break;
123 
124 		default:
125 			rc = -ETIMEDOUT;
126 			break;
127 		}
128 	} else {
129 		pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
130 		       completion_rc);
131 
132 		rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
133 	}
134 
135 	ndev->req_status = ndev->req_result = 0;
136 
137 	return rc;
138 }
139 
nci_request(struct nci_dev * ndev,void (* req)(struct nci_dev * ndev,unsigned long opt),unsigned long opt,__u32 timeout)140 inline int nci_request(struct nci_dev *ndev,
141 		       void (*req)(struct nci_dev *ndev,
142 				   unsigned long opt),
143 		       unsigned long opt, __u32 timeout)
144 {
145 	int rc;
146 
147 	if (!test_bit(NCI_UP, &ndev->flags))
148 		return -ENETDOWN;
149 
150 	/* Serialize all requests */
151 	mutex_lock(&ndev->req_lock);
152 	rc = __nci_request(ndev, req, opt, timeout);
153 	mutex_unlock(&ndev->req_lock);
154 
155 	return rc;
156 }
157 
nci_reset_req(struct nci_dev * ndev,unsigned long opt)158 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
159 {
160 	struct nci_core_reset_cmd cmd;
161 
162 	cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
163 	nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
164 }
165 
nci_init_req(struct nci_dev * ndev,unsigned long opt)166 static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
167 {
168 	nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
169 }
170 
nci_init_complete_req(struct nci_dev * ndev,unsigned long opt)171 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
172 {
173 	struct nci_rf_disc_map_cmd cmd;
174 	struct disc_map_config *cfg = cmd.mapping_configs;
175 	__u8 *num = &cmd.num_mapping_configs;
176 	int i;
177 
178 	/* set rf mapping configurations */
179 	*num = 0;
180 
181 	/* by default mapping is set to NCI_RF_INTERFACE_FRAME */
182 	for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
183 		if (ndev->supported_rf_interfaces[i] ==
184 		    NCI_RF_INTERFACE_ISO_DEP) {
185 			cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
186 			cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
187 				NCI_DISC_MAP_MODE_LISTEN;
188 			cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
189 			(*num)++;
190 		} else if (ndev->supported_rf_interfaces[i] ==
191 			   NCI_RF_INTERFACE_NFC_DEP) {
192 			cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
193 			cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
194 				NCI_DISC_MAP_MODE_LISTEN;
195 			cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
196 			(*num)++;
197 		}
198 
199 		if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
200 			break;
201 	}
202 
203 	nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
204 		     (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
205 }
206 
207 struct nci_set_config_param {
208 	__u8	id;
209 	size_t	len;
210 	__u8	*val;
211 };
212 
nci_set_config_req(struct nci_dev * ndev,unsigned long opt)213 static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
214 {
215 	struct nci_set_config_param *param = (struct nci_set_config_param *)opt;
216 	struct nci_core_set_config_cmd cmd;
217 
218 	BUG_ON(param->len > NCI_MAX_PARAM_LEN);
219 
220 	cmd.num_params = 1;
221 	cmd.param.id = param->id;
222 	cmd.param.len = param->len;
223 	memcpy(cmd.param.val, param->val, param->len);
224 
225 	nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
226 }
227 
228 struct nci_rf_discover_param {
229 	__u32	im_protocols;
230 	__u32	tm_protocols;
231 };
232 
nci_rf_discover_req(struct nci_dev * ndev,unsigned long opt)233 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
234 {
235 	struct nci_rf_discover_param *param =
236 		(struct nci_rf_discover_param *)opt;
237 	struct nci_rf_disc_cmd cmd;
238 
239 	cmd.num_disc_configs = 0;
240 
241 	if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
242 	    (param->im_protocols & NFC_PROTO_JEWEL_MASK ||
243 	     param->im_protocols & NFC_PROTO_MIFARE_MASK ||
244 	     param->im_protocols & NFC_PROTO_ISO14443_MASK ||
245 	     param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
246 		cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
247 			NCI_NFC_A_PASSIVE_POLL_MODE;
248 		cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
249 		cmd.num_disc_configs++;
250 	}
251 
252 	if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
253 	    (param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) {
254 		cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
255 			NCI_NFC_B_PASSIVE_POLL_MODE;
256 		cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
257 		cmd.num_disc_configs++;
258 	}
259 
260 	if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
261 	    (param->im_protocols & NFC_PROTO_FELICA_MASK ||
262 	     param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
263 		cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
264 			NCI_NFC_F_PASSIVE_POLL_MODE;
265 		cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
266 		cmd.num_disc_configs++;
267 	}
268 
269 	if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
270 	    (param->im_protocols & NFC_PROTO_ISO15693_MASK)) {
271 		cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
272 			NCI_NFC_V_PASSIVE_POLL_MODE;
273 		cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
274 		cmd.num_disc_configs++;
275 	}
276 
277 	if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) &&
278 	    (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) {
279 		cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
280 			NCI_NFC_A_PASSIVE_LISTEN_MODE;
281 		cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
282 		cmd.num_disc_configs++;
283 		cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
284 			NCI_NFC_F_PASSIVE_LISTEN_MODE;
285 		cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
286 		cmd.num_disc_configs++;
287 	}
288 
289 	nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
290 		     (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
291 		     &cmd);
292 }
293 
294 struct nci_rf_discover_select_param {
295 	__u8	rf_discovery_id;
296 	__u8	rf_protocol;
297 };
298 
nci_rf_discover_select_req(struct nci_dev * ndev,unsigned long opt)299 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
300 {
301 	struct nci_rf_discover_select_param *param =
302 		(struct nci_rf_discover_select_param *)opt;
303 	struct nci_rf_discover_select_cmd cmd;
304 
305 	cmd.rf_discovery_id = param->rf_discovery_id;
306 	cmd.rf_protocol = param->rf_protocol;
307 
308 	switch (cmd.rf_protocol) {
309 	case NCI_RF_PROTOCOL_ISO_DEP:
310 		cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
311 		break;
312 
313 	case NCI_RF_PROTOCOL_NFC_DEP:
314 		cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
315 		break;
316 
317 	default:
318 		cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
319 		break;
320 	}
321 
322 	nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
323 		     sizeof(struct nci_rf_discover_select_cmd), &cmd);
324 }
325 
nci_rf_deactivate_req(struct nci_dev * ndev,unsigned long opt)326 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
327 {
328 	struct nci_rf_deactivate_cmd cmd;
329 
330 	cmd.type = opt;
331 
332 	nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
333 		     sizeof(struct nci_rf_deactivate_cmd), &cmd);
334 }
335 
336 struct nci_cmd_param {
337 	__u16 opcode;
338 	size_t len;
339 	__u8 *payload;
340 };
341 
nci_generic_req(struct nci_dev * ndev,unsigned long opt)342 static void nci_generic_req(struct nci_dev *ndev, unsigned long opt)
343 {
344 	struct nci_cmd_param *param =
345 		(struct nci_cmd_param *)opt;
346 
347 	nci_send_cmd(ndev, param->opcode, param->len, param->payload);
348 }
349 
nci_prop_cmd(struct nci_dev * ndev,__u8 oid,size_t len,__u8 * payload)350 int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, __u8 *payload)
351 {
352 	struct nci_cmd_param param;
353 
354 	param.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, oid);
355 	param.len = len;
356 	param.payload = payload;
357 
358 	return __nci_request(ndev, nci_generic_req, (unsigned long)&param,
359 			     msecs_to_jiffies(NCI_CMD_TIMEOUT));
360 }
361 EXPORT_SYMBOL(nci_prop_cmd);
362 
nci_core_cmd(struct nci_dev * ndev,__u16 opcode,size_t len,__u8 * payload)363 int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len, __u8 *payload)
364 {
365 	struct nci_cmd_param param;
366 
367 	param.opcode = opcode;
368 	param.len = len;
369 	param.payload = payload;
370 
371 	return __nci_request(ndev, nci_generic_req, (unsigned long)&param,
372 			     msecs_to_jiffies(NCI_CMD_TIMEOUT));
373 }
374 EXPORT_SYMBOL(nci_core_cmd);
375 
nci_core_reset(struct nci_dev * ndev)376 int nci_core_reset(struct nci_dev *ndev)
377 {
378 	return __nci_request(ndev, nci_reset_req, 0,
379 			     msecs_to_jiffies(NCI_RESET_TIMEOUT));
380 }
381 EXPORT_SYMBOL(nci_core_reset);
382 
nci_core_init(struct nci_dev * ndev)383 int nci_core_init(struct nci_dev *ndev)
384 {
385 	return __nci_request(ndev, nci_init_req, 0,
386 			     msecs_to_jiffies(NCI_INIT_TIMEOUT));
387 }
388 EXPORT_SYMBOL(nci_core_init);
389 
390 struct nci_loopback_data {
391 	u8 conn_id;
392 	struct sk_buff *data;
393 };
394 
nci_send_data_req(struct nci_dev * ndev,unsigned long opt)395 static void nci_send_data_req(struct nci_dev *ndev, unsigned long opt)
396 {
397 	struct nci_loopback_data *data = (struct nci_loopback_data *)opt;
398 
399 	nci_send_data(ndev, data->conn_id, data->data);
400 }
401 
nci_nfcc_loopback_cb(void * context,struct sk_buff * skb,int err)402 static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err)
403 {
404 	struct nci_dev *ndev = (struct nci_dev *)context;
405 	struct nci_conn_info    *conn_info;
406 
407 	conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
408 	if (!conn_info) {
409 		nci_req_complete(ndev, NCI_STATUS_REJECTED);
410 		return;
411 	}
412 
413 	conn_info->rx_skb = skb;
414 
415 	nci_req_complete(ndev, NCI_STATUS_OK);
416 }
417 
nci_nfcc_loopback(struct nci_dev * ndev,void * data,size_t data_len,struct sk_buff ** resp)418 int nci_nfcc_loopback(struct nci_dev *ndev, void *data, size_t data_len,
419 		      struct sk_buff **resp)
420 {
421 	int r;
422 	struct nci_loopback_data loopback_data;
423 	struct nci_conn_info *conn_info;
424 	struct sk_buff *skb;
425 	int conn_id = nci_get_conn_info_by_dest_type_params(ndev,
426 					NCI_DESTINATION_NFCC_LOOPBACK, NULL);
427 
428 	if (conn_id < 0) {
429 		r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCC_LOOPBACK,
430 					 0, 0, NULL);
431 		if (r != NCI_STATUS_OK)
432 			return r;
433 
434 		conn_id = nci_get_conn_info_by_dest_type_params(ndev,
435 					NCI_DESTINATION_NFCC_LOOPBACK,
436 					NULL);
437 	}
438 
439 	conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
440 	if (!conn_info)
441 		return -EPROTO;
442 
443 	/* store cb and context to be used on receiving data */
444 	conn_info->data_exchange_cb = nci_nfcc_loopback_cb;
445 	conn_info->data_exchange_cb_context = ndev;
446 
447 	skb = nci_skb_alloc(ndev, NCI_DATA_HDR_SIZE + data_len, GFP_KERNEL);
448 	if (!skb)
449 		return -ENOMEM;
450 
451 	skb_reserve(skb, NCI_DATA_HDR_SIZE);
452 	skb_put_data(skb, data, data_len);
453 
454 	loopback_data.conn_id = conn_id;
455 	loopback_data.data = skb;
456 
457 	ndev->cur_conn_id = conn_id;
458 	r = nci_request(ndev, nci_send_data_req, (unsigned long)&loopback_data,
459 			msecs_to_jiffies(NCI_DATA_TIMEOUT));
460 	if (r == NCI_STATUS_OK && resp)
461 		*resp = conn_info->rx_skb;
462 
463 	return r;
464 }
465 EXPORT_SYMBOL(nci_nfcc_loopback);
466 
nci_open_device(struct nci_dev * ndev)467 static int nci_open_device(struct nci_dev *ndev)
468 {
469 	int rc = 0;
470 
471 	mutex_lock(&ndev->req_lock);
472 
473 	if (test_bit(NCI_UP, &ndev->flags)) {
474 		rc = -EALREADY;
475 		goto done;
476 	}
477 
478 	if (ndev->ops->open(ndev)) {
479 		rc = -EIO;
480 		goto done;
481 	}
482 
483 	atomic_set(&ndev->cmd_cnt, 1);
484 
485 	set_bit(NCI_INIT, &ndev->flags);
486 
487 	if (ndev->ops->init)
488 		rc = ndev->ops->init(ndev);
489 
490 	if (!rc) {
491 		rc = __nci_request(ndev, nci_reset_req, 0,
492 				   msecs_to_jiffies(NCI_RESET_TIMEOUT));
493 	}
494 
495 	if (!rc && ndev->ops->setup) {
496 		rc = ndev->ops->setup(ndev);
497 	}
498 
499 	if (!rc) {
500 		rc = __nci_request(ndev, nci_init_req, 0,
501 				   msecs_to_jiffies(NCI_INIT_TIMEOUT));
502 	}
503 
504 	if (!rc && ndev->ops->post_setup)
505 		rc = ndev->ops->post_setup(ndev);
506 
507 	if (!rc) {
508 		rc = __nci_request(ndev, nci_init_complete_req, 0,
509 				   msecs_to_jiffies(NCI_INIT_TIMEOUT));
510 	}
511 
512 	clear_bit(NCI_INIT, &ndev->flags);
513 
514 	if (!rc) {
515 		set_bit(NCI_UP, &ndev->flags);
516 		nci_clear_target_list(ndev);
517 		atomic_set(&ndev->state, NCI_IDLE);
518 	} else {
519 		/* Init failed, cleanup */
520 		skb_queue_purge(&ndev->cmd_q);
521 		skb_queue_purge(&ndev->rx_q);
522 		skb_queue_purge(&ndev->tx_q);
523 
524 		ndev->ops->close(ndev);
525 		ndev->flags = 0;
526 	}
527 
528 done:
529 	mutex_unlock(&ndev->req_lock);
530 	return rc;
531 }
532 
nci_close_device(struct nci_dev * ndev)533 static int nci_close_device(struct nci_dev *ndev)
534 {
535 	nci_req_cancel(ndev, ENODEV);
536 	mutex_lock(&ndev->req_lock);
537 
538 	if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
539 		del_timer_sync(&ndev->cmd_timer);
540 		del_timer_sync(&ndev->data_timer);
541 		mutex_unlock(&ndev->req_lock);
542 		return 0;
543 	}
544 
545 	/* Drop RX and TX queues */
546 	skb_queue_purge(&ndev->rx_q);
547 	skb_queue_purge(&ndev->tx_q);
548 
549 	/* Flush RX and TX wq */
550 	flush_workqueue(ndev->rx_wq);
551 	flush_workqueue(ndev->tx_wq);
552 
553 	/* Reset device */
554 	skb_queue_purge(&ndev->cmd_q);
555 	atomic_set(&ndev->cmd_cnt, 1);
556 
557 	set_bit(NCI_INIT, &ndev->flags);
558 	__nci_request(ndev, nci_reset_req, 0,
559 		      msecs_to_jiffies(NCI_RESET_TIMEOUT));
560 
561 	/* After this point our queues are empty
562 	 * and no works are scheduled.
563 	 */
564 	ndev->ops->close(ndev);
565 
566 	clear_bit(NCI_INIT, &ndev->flags);
567 
568 	del_timer_sync(&ndev->cmd_timer);
569 
570 	/* Flush cmd wq */
571 	flush_workqueue(ndev->cmd_wq);
572 
573 	/* Clear flags */
574 	ndev->flags = 0;
575 
576 	mutex_unlock(&ndev->req_lock);
577 
578 	return 0;
579 }
580 
581 /* NCI command timer function */
nci_cmd_timer(struct timer_list * t)582 static void nci_cmd_timer(struct timer_list *t)
583 {
584 	struct nci_dev *ndev = from_timer(ndev, t, cmd_timer);
585 
586 	atomic_set(&ndev->cmd_cnt, 1);
587 	queue_work(ndev->cmd_wq, &ndev->cmd_work);
588 }
589 
590 /* NCI data exchange timer function */
nci_data_timer(struct timer_list * t)591 static void nci_data_timer(struct timer_list *t)
592 {
593 	struct nci_dev *ndev = from_timer(ndev, t, data_timer);
594 
595 	set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
596 	queue_work(ndev->rx_wq, &ndev->rx_work);
597 }
598 
nci_dev_up(struct nfc_dev * nfc_dev)599 static int nci_dev_up(struct nfc_dev *nfc_dev)
600 {
601 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
602 
603 	return nci_open_device(ndev);
604 }
605 
nci_dev_down(struct nfc_dev * nfc_dev)606 static int nci_dev_down(struct nfc_dev *nfc_dev)
607 {
608 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
609 
610 	return nci_close_device(ndev);
611 }
612 
nci_set_config(struct nci_dev * ndev,__u8 id,size_t len,__u8 * val)613 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val)
614 {
615 	struct nci_set_config_param param;
616 
617 	if (!val || !len)
618 		return 0;
619 
620 	param.id = id;
621 	param.len = len;
622 	param.val = val;
623 
624 	return __nci_request(ndev, nci_set_config_req, (unsigned long)&param,
625 			     msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
626 }
627 EXPORT_SYMBOL(nci_set_config);
628 
nci_nfcee_discover_req(struct nci_dev * ndev,unsigned long opt)629 static void nci_nfcee_discover_req(struct nci_dev *ndev, unsigned long opt)
630 {
631 	struct nci_nfcee_discover_cmd cmd;
632 	__u8 action = opt;
633 
634 	cmd.discovery_action = action;
635 
636 	nci_send_cmd(ndev, NCI_OP_NFCEE_DISCOVER_CMD, 1, &cmd);
637 }
638 
nci_nfcee_discover(struct nci_dev * ndev,u8 action)639 int nci_nfcee_discover(struct nci_dev *ndev, u8 action)
640 {
641 	return __nci_request(ndev, nci_nfcee_discover_req, action,
642 				msecs_to_jiffies(NCI_CMD_TIMEOUT));
643 }
644 EXPORT_SYMBOL(nci_nfcee_discover);
645 
nci_nfcee_mode_set_req(struct nci_dev * ndev,unsigned long opt)646 static void nci_nfcee_mode_set_req(struct nci_dev *ndev, unsigned long opt)
647 {
648 	struct nci_nfcee_mode_set_cmd *cmd =
649 					(struct nci_nfcee_mode_set_cmd *)opt;
650 
651 	nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD,
652 		     sizeof(struct nci_nfcee_mode_set_cmd), cmd);
653 }
654 
nci_nfcee_mode_set(struct nci_dev * ndev,u8 nfcee_id,u8 nfcee_mode)655 int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode)
656 {
657 	struct nci_nfcee_mode_set_cmd cmd;
658 
659 	cmd.nfcee_id = nfcee_id;
660 	cmd.nfcee_mode = nfcee_mode;
661 
662 	return __nci_request(ndev, nci_nfcee_mode_set_req,
663 			     (unsigned long)&cmd,
664 			     msecs_to_jiffies(NCI_CMD_TIMEOUT));
665 }
666 EXPORT_SYMBOL(nci_nfcee_mode_set);
667 
nci_core_conn_create_req(struct nci_dev * ndev,unsigned long opt)668 static void nci_core_conn_create_req(struct nci_dev *ndev, unsigned long opt)
669 {
670 	struct core_conn_create_data *data =
671 					(struct core_conn_create_data *)opt;
672 
673 	nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd);
674 }
675 
nci_core_conn_create(struct nci_dev * ndev,u8 destination_type,u8 number_destination_params,size_t params_len,struct core_conn_create_dest_spec_params * params)676 int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
677 			 u8 number_destination_params,
678 			 size_t params_len,
679 			 struct core_conn_create_dest_spec_params *params)
680 {
681 	int r;
682 	struct nci_core_conn_create_cmd *cmd;
683 	struct core_conn_create_data data;
684 
685 	data.length = params_len + sizeof(struct nci_core_conn_create_cmd);
686 	cmd = kzalloc(data.length, GFP_KERNEL);
687 	if (!cmd)
688 		return -ENOMEM;
689 
690 	cmd->destination_type = destination_type;
691 	cmd->number_destination_params = number_destination_params;
692 
693 	data.cmd = cmd;
694 
695 	if (params) {
696 		memcpy(cmd->params, params, params_len);
697 		if (params->length > 0)
698 			memcpy(&ndev->cur_params,
699 			       &params->value[DEST_SPEC_PARAMS_ID_INDEX],
700 			       sizeof(struct dest_spec_params));
701 		else
702 			ndev->cur_params.id = 0;
703 	} else {
704 		ndev->cur_params.id = 0;
705 	}
706 	ndev->cur_dest_type = destination_type;
707 
708 	r = __nci_request(ndev, nci_core_conn_create_req, (unsigned long)&data,
709 			  msecs_to_jiffies(NCI_CMD_TIMEOUT));
710 	kfree(cmd);
711 	return r;
712 }
713 EXPORT_SYMBOL(nci_core_conn_create);
714 
nci_core_conn_close_req(struct nci_dev * ndev,unsigned long opt)715 static void nci_core_conn_close_req(struct nci_dev *ndev, unsigned long opt)
716 {
717 	__u8 conn_id = opt;
718 
719 	nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id);
720 }
721 
nci_core_conn_close(struct nci_dev * ndev,u8 conn_id)722 int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id)
723 {
724 	ndev->cur_conn_id = conn_id;
725 	return __nci_request(ndev, nci_core_conn_close_req, conn_id,
726 			     msecs_to_jiffies(NCI_CMD_TIMEOUT));
727 }
728 EXPORT_SYMBOL(nci_core_conn_close);
729 
nci_set_local_general_bytes(struct nfc_dev * nfc_dev)730 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
731 {
732 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
733 	struct nci_set_config_param param;
734 	int rc;
735 
736 	param.val = nfc_get_local_general_bytes(nfc_dev, &param.len);
737 	if ((param.val == NULL) || (param.len == 0))
738 		return 0;
739 
740 	if (param.len > NFC_MAX_GT_LEN)
741 		return -EINVAL;
742 
743 	param.id = NCI_PN_ATR_REQ_GEN_BYTES;
744 
745 	rc = nci_request(ndev, nci_set_config_req, (unsigned long)&param,
746 			 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
747 	if (rc)
748 		return rc;
749 
750 	param.id = NCI_LN_ATR_RES_GEN_BYTES;
751 
752 	return nci_request(ndev, nci_set_config_req, (unsigned long)&param,
753 			   msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
754 }
755 
nci_set_listen_parameters(struct nfc_dev * nfc_dev)756 static int nci_set_listen_parameters(struct nfc_dev *nfc_dev)
757 {
758 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
759 	int rc;
760 	__u8 val;
761 
762 	val = NCI_LA_SEL_INFO_NFC_DEP_MASK;
763 
764 	rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val);
765 	if (rc)
766 		return rc;
767 
768 	val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK;
769 
770 	rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val);
771 	if (rc)
772 		return rc;
773 
774 	val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424;
775 
776 	return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val);
777 }
778 
nci_start_poll(struct nfc_dev * nfc_dev,__u32 im_protocols,__u32 tm_protocols)779 static int nci_start_poll(struct nfc_dev *nfc_dev,
780 			  __u32 im_protocols, __u32 tm_protocols)
781 {
782 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
783 	struct nci_rf_discover_param param;
784 	int rc;
785 
786 	if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
787 	    (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
788 		pr_err("unable to start poll, since poll is already active\n");
789 		return -EBUSY;
790 	}
791 
792 	if (ndev->target_active_prot) {
793 		pr_err("there is an active target\n");
794 		return -EBUSY;
795 	}
796 
797 	if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
798 	    (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
799 		pr_debug("target active or w4 select, implicitly deactivate\n");
800 
801 		rc = nci_request(ndev, nci_rf_deactivate_req,
802 				 NCI_DEACTIVATE_TYPE_IDLE_MODE,
803 				 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
804 		if (rc)
805 			return -EBUSY;
806 	}
807 
808 	if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
809 		rc = nci_set_local_general_bytes(nfc_dev);
810 		if (rc) {
811 			pr_err("failed to set local general bytes\n");
812 			return rc;
813 		}
814 	}
815 
816 	if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
817 		rc = nci_set_listen_parameters(nfc_dev);
818 		if (rc)
819 			pr_err("failed to set listen parameters\n");
820 	}
821 
822 	param.im_protocols = im_protocols;
823 	param.tm_protocols = tm_protocols;
824 	rc = nci_request(ndev, nci_rf_discover_req, (unsigned long)&param,
825 			 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
826 
827 	if (!rc)
828 		ndev->poll_prots = im_protocols;
829 
830 	return rc;
831 }
832 
nci_stop_poll(struct nfc_dev * nfc_dev)833 static void nci_stop_poll(struct nfc_dev *nfc_dev)
834 {
835 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
836 
837 	if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
838 	    (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
839 		pr_err("unable to stop poll, since poll is not active\n");
840 		return;
841 	}
842 
843 	nci_request(ndev, nci_rf_deactivate_req, NCI_DEACTIVATE_TYPE_IDLE_MODE,
844 		    msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
845 }
846 
nci_activate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,__u32 protocol)847 static int nci_activate_target(struct nfc_dev *nfc_dev,
848 			       struct nfc_target *target, __u32 protocol)
849 {
850 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
851 	struct nci_rf_discover_select_param param;
852 	struct nfc_target *nci_target = NULL;
853 	int i;
854 	int rc = 0;
855 
856 	pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
857 
858 	if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
859 	    (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
860 		pr_err("there is no available target to activate\n");
861 		return -EINVAL;
862 	}
863 
864 	if (ndev->target_active_prot) {
865 		pr_err("there is already an active target\n");
866 		return -EBUSY;
867 	}
868 
869 	for (i = 0; i < ndev->n_targets; i++) {
870 		if (ndev->targets[i].idx == target->idx) {
871 			nci_target = &ndev->targets[i];
872 			break;
873 		}
874 	}
875 
876 	if (!nci_target) {
877 		pr_err("unable to find the selected target\n");
878 		return -EINVAL;
879 	}
880 
881 	if (!(nci_target->supported_protocols & (1 << protocol))) {
882 		pr_err("target does not support the requested protocol 0x%x\n",
883 		       protocol);
884 		return -EINVAL;
885 	}
886 
887 	if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
888 		param.rf_discovery_id = nci_target->logical_idx;
889 
890 		if (protocol == NFC_PROTO_JEWEL)
891 			param.rf_protocol = NCI_RF_PROTOCOL_T1T;
892 		else if (protocol == NFC_PROTO_MIFARE)
893 			param.rf_protocol = NCI_RF_PROTOCOL_T2T;
894 		else if (protocol == NFC_PROTO_FELICA)
895 			param.rf_protocol = NCI_RF_PROTOCOL_T3T;
896 		else if (protocol == NFC_PROTO_ISO14443 ||
897 			 protocol == NFC_PROTO_ISO14443_B)
898 			param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
899 		else
900 			param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
901 
902 		rc = nci_request(ndev, nci_rf_discover_select_req,
903 				 (unsigned long)&param,
904 				 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
905 	}
906 
907 	if (!rc)
908 		ndev->target_active_prot = protocol;
909 
910 	return rc;
911 }
912 
nci_deactivate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,__u8 mode)913 static void nci_deactivate_target(struct nfc_dev *nfc_dev,
914 				  struct nfc_target *target,
915 				  __u8 mode)
916 {
917 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
918 	u8 nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE;
919 
920 	pr_debug("entry\n");
921 
922 	if (!ndev->target_active_prot) {
923 		pr_err("unable to deactivate target, no active target\n");
924 		return;
925 	}
926 
927 	ndev->target_active_prot = 0;
928 
929 	switch (mode) {
930 	case NFC_TARGET_MODE_SLEEP:
931 		nci_mode = NCI_DEACTIVATE_TYPE_SLEEP_MODE;
932 		break;
933 	}
934 
935 	if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
936 		nci_request(ndev, nci_rf_deactivate_req, nci_mode,
937 			    msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
938 	}
939 }
940 
nci_dep_link_up(struct nfc_dev * nfc_dev,struct nfc_target * target,__u8 comm_mode,__u8 * gb,size_t gb_len)941 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
942 			   __u8 comm_mode, __u8 *gb, size_t gb_len)
943 {
944 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
945 	int rc;
946 
947 	pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
948 
949 	rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
950 	if (rc)
951 		return rc;
952 
953 	rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
954 					  ndev->remote_gb_len);
955 	if (!rc)
956 		rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
957 					NFC_RF_INITIATOR);
958 
959 	return rc;
960 }
961 
nci_dep_link_down(struct nfc_dev * nfc_dev)962 static int nci_dep_link_down(struct nfc_dev *nfc_dev)
963 {
964 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
965 	int rc;
966 
967 	pr_debug("entry\n");
968 
969 	if (nfc_dev->rf_mode == NFC_RF_INITIATOR) {
970 		nci_deactivate_target(nfc_dev, NULL, NCI_DEACTIVATE_TYPE_IDLE_MODE);
971 	} else {
972 		if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE ||
973 		    atomic_read(&ndev->state) == NCI_DISCOVERY) {
974 			nci_request(ndev, nci_rf_deactivate_req, 0,
975 				msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
976 		}
977 
978 		rc = nfc_tm_deactivated(nfc_dev);
979 		if (rc)
980 			pr_err("error when signaling tm deactivation\n");
981 	}
982 
983 	return 0;
984 }
985 
986 
nci_transceive(struct nfc_dev * nfc_dev,struct nfc_target * target,struct sk_buff * skb,data_exchange_cb_t cb,void * cb_context)987 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
988 			  struct sk_buff *skb,
989 			  data_exchange_cb_t cb, void *cb_context)
990 {
991 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
992 	int rc;
993 	struct nci_conn_info    *conn_info;
994 
995 	conn_info = ndev->rf_conn_info;
996 	if (!conn_info)
997 		return -EPROTO;
998 
999 	pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
1000 
1001 	if (!ndev->target_active_prot) {
1002 		pr_err("unable to exchange data, no active target\n");
1003 		return -EINVAL;
1004 	}
1005 
1006 	if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1007 		return -EBUSY;
1008 
1009 	/* store cb and context to be used on receiving data */
1010 	conn_info->data_exchange_cb = cb;
1011 	conn_info->data_exchange_cb_context = cb_context;
1012 
1013 	rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1014 	if (rc)
1015 		clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
1016 
1017 	return rc;
1018 }
1019 
nci_tm_send(struct nfc_dev * nfc_dev,struct sk_buff * skb)1020 static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
1021 {
1022 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1023 	int rc;
1024 
1025 	rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1026 	if (rc)
1027 		pr_err("unable to send data\n");
1028 
1029 	return rc;
1030 }
1031 
nci_enable_se(struct nfc_dev * nfc_dev,u32 se_idx)1032 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1033 {
1034 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1035 
1036 	if (ndev->ops->enable_se)
1037 		return ndev->ops->enable_se(ndev, se_idx);
1038 
1039 	return 0;
1040 }
1041 
nci_disable_se(struct nfc_dev * nfc_dev,u32 se_idx)1042 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1043 {
1044 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1045 
1046 	if (ndev->ops->disable_se)
1047 		return ndev->ops->disable_se(ndev, se_idx);
1048 
1049 	return 0;
1050 }
1051 
nci_discover_se(struct nfc_dev * nfc_dev)1052 static int nci_discover_se(struct nfc_dev *nfc_dev)
1053 {
1054 	int r;
1055 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1056 
1057 	if (ndev->ops->discover_se) {
1058 		r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE);
1059 		if (r != NCI_STATUS_OK)
1060 			return -EPROTO;
1061 
1062 		return ndev->ops->discover_se(ndev);
1063 	}
1064 
1065 	return 0;
1066 }
1067 
nci_se_io(struct nfc_dev * nfc_dev,u32 se_idx,u8 * apdu,size_t apdu_length,se_io_cb_t cb,void * cb_context)1068 static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
1069 		     u8 *apdu, size_t apdu_length,
1070 		     se_io_cb_t cb, void *cb_context)
1071 {
1072 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1073 
1074 	if (ndev->ops->se_io)
1075 		return ndev->ops->se_io(ndev, se_idx, apdu,
1076 				apdu_length, cb, cb_context);
1077 
1078 	return 0;
1079 }
1080 
nci_fw_download(struct nfc_dev * nfc_dev,const char * firmware_name)1081 static int nci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
1082 {
1083 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1084 
1085 	if (!ndev->ops->fw_download)
1086 		return -ENOTSUPP;
1087 
1088 	return ndev->ops->fw_download(ndev, firmware_name);
1089 }
1090 
1091 static struct nfc_ops nci_nfc_ops = {
1092 	.dev_up = nci_dev_up,
1093 	.dev_down = nci_dev_down,
1094 	.start_poll = nci_start_poll,
1095 	.stop_poll = nci_stop_poll,
1096 	.dep_link_up = nci_dep_link_up,
1097 	.dep_link_down = nci_dep_link_down,
1098 	.activate_target = nci_activate_target,
1099 	.deactivate_target = nci_deactivate_target,
1100 	.im_transceive = nci_transceive,
1101 	.tm_send = nci_tm_send,
1102 	.enable_se = nci_enable_se,
1103 	.disable_se = nci_disable_se,
1104 	.discover_se = nci_discover_se,
1105 	.se_io = nci_se_io,
1106 	.fw_download = nci_fw_download,
1107 };
1108 
1109 /* ---- Interface to NCI drivers ---- */
1110 /**
1111  * nci_allocate_device - allocate a new nci device
1112  *
1113  * @ops: device operations
1114  * @supported_protocols: NFC protocols supported by the device
1115  */
nci_allocate_device(struct nci_ops * ops,__u32 supported_protocols,int tx_headroom,int tx_tailroom)1116 struct nci_dev *nci_allocate_device(struct nci_ops *ops,
1117 				    __u32 supported_protocols,
1118 				    int tx_headroom, int tx_tailroom)
1119 {
1120 	struct nci_dev *ndev;
1121 
1122 	pr_debug("supported_protocols 0x%x\n", supported_protocols);
1123 
1124 	if (!ops->open || !ops->close || !ops->send)
1125 		return NULL;
1126 
1127 	if (!supported_protocols)
1128 		return NULL;
1129 
1130 	ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
1131 	if (!ndev)
1132 		return NULL;
1133 
1134 	ndev->ops = ops;
1135 
1136 	if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) {
1137 		pr_err("Too many proprietary commands: %zd\n",
1138 		       ops->n_prop_ops);
1139 		ops->prop_ops = NULL;
1140 		ops->n_prop_ops = 0;
1141 	}
1142 
1143 	ndev->tx_headroom = tx_headroom;
1144 	ndev->tx_tailroom = tx_tailroom;
1145 	init_completion(&ndev->req_completion);
1146 
1147 	ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
1148 					    supported_protocols,
1149 					    tx_headroom + NCI_DATA_HDR_SIZE,
1150 					    tx_tailroom);
1151 	if (!ndev->nfc_dev)
1152 		goto free_nci;
1153 
1154 	ndev->hci_dev = nci_hci_allocate(ndev);
1155 	if (!ndev->hci_dev)
1156 		goto free_nfc;
1157 
1158 	nfc_set_drvdata(ndev->nfc_dev, ndev);
1159 
1160 	return ndev;
1161 
1162 free_nfc:
1163 	nfc_free_device(ndev->nfc_dev);
1164 free_nci:
1165 	kfree(ndev);
1166 	return NULL;
1167 }
1168 EXPORT_SYMBOL(nci_allocate_device);
1169 
1170 /**
1171  * nci_free_device - deallocate nci device
1172  *
1173  * @ndev: The nci device to deallocate
1174  */
nci_free_device(struct nci_dev * ndev)1175 void nci_free_device(struct nci_dev *ndev)
1176 {
1177 	nfc_free_device(ndev->nfc_dev);
1178 	kfree(ndev);
1179 }
1180 EXPORT_SYMBOL(nci_free_device);
1181 
1182 /**
1183  * nci_register_device - register a nci device in the nfc subsystem
1184  *
1185  * @dev: The nci device to register
1186  */
nci_register_device(struct nci_dev * ndev)1187 int nci_register_device(struct nci_dev *ndev)
1188 {
1189 	int rc;
1190 	struct device *dev = &ndev->nfc_dev->dev;
1191 	char name[32];
1192 
1193 	ndev->flags = 0;
1194 
1195 	INIT_WORK(&ndev->cmd_work, nci_cmd_work);
1196 	snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
1197 	ndev->cmd_wq = create_singlethread_workqueue(name);
1198 	if (!ndev->cmd_wq) {
1199 		rc = -ENOMEM;
1200 		goto exit;
1201 	}
1202 
1203 	INIT_WORK(&ndev->rx_work, nci_rx_work);
1204 	snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
1205 	ndev->rx_wq = create_singlethread_workqueue(name);
1206 	if (!ndev->rx_wq) {
1207 		rc = -ENOMEM;
1208 		goto destroy_cmd_wq_exit;
1209 	}
1210 
1211 	INIT_WORK(&ndev->tx_work, nci_tx_work);
1212 	snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
1213 	ndev->tx_wq = create_singlethread_workqueue(name);
1214 	if (!ndev->tx_wq) {
1215 		rc = -ENOMEM;
1216 		goto destroy_rx_wq_exit;
1217 	}
1218 
1219 	skb_queue_head_init(&ndev->cmd_q);
1220 	skb_queue_head_init(&ndev->rx_q);
1221 	skb_queue_head_init(&ndev->tx_q);
1222 
1223 	timer_setup(&ndev->cmd_timer, nci_cmd_timer, 0);
1224 	timer_setup(&ndev->data_timer, nci_data_timer, 0);
1225 
1226 	mutex_init(&ndev->req_lock);
1227 	INIT_LIST_HEAD(&ndev->conn_info_list);
1228 
1229 	rc = nfc_register_device(ndev->nfc_dev);
1230 	if (rc)
1231 		goto destroy_rx_wq_exit;
1232 
1233 	goto exit;
1234 
1235 destroy_rx_wq_exit:
1236 	destroy_workqueue(ndev->rx_wq);
1237 
1238 destroy_cmd_wq_exit:
1239 	destroy_workqueue(ndev->cmd_wq);
1240 
1241 exit:
1242 	return rc;
1243 }
1244 EXPORT_SYMBOL(nci_register_device);
1245 
1246 /**
1247  * nci_unregister_device - unregister a nci device in the nfc subsystem
1248  *
1249  * @dev: The nci device to unregister
1250  */
nci_unregister_device(struct nci_dev * ndev)1251 void nci_unregister_device(struct nci_dev *ndev)
1252 {
1253 	struct nci_conn_info    *conn_info, *n;
1254 
1255 	nci_close_device(ndev);
1256 
1257 	destroy_workqueue(ndev->cmd_wq);
1258 	destroy_workqueue(ndev->rx_wq);
1259 	destroy_workqueue(ndev->tx_wq);
1260 
1261 	list_for_each_entry_safe(conn_info, n, &ndev->conn_info_list, list) {
1262 		list_del(&conn_info->list);
1263 		/* conn_info is allocated with devm_kzalloc */
1264 	}
1265 
1266 	nfc_unregister_device(ndev->nfc_dev);
1267 }
1268 EXPORT_SYMBOL(nci_unregister_device);
1269 
1270 /**
1271  * nci_recv_frame - receive frame from NCI drivers
1272  *
1273  * @ndev: The nci device
1274  * @skb: The sk_buff to receive
1275  */
nci_recv_frame(struct nci_dev * ndev,struct sk_buff * skb)1276 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
1277 {
1278 	pr_debug("len %d\n", skb->len);
1279 
1280 	if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
1281 	    !test_bit(NCI_INIT, &ndev->flags))) {
1282 		kfree_skb(skb);
1283 		return -ENXIO;
1284 	}
1285 
1286 	/* Queue frame for rx worker thread */
1287 	skb_queue_tail(&ndev->rx_q, skb);
1288 	queue_work(ndev->rx_wq, &ndev->rx_work);
1289 
1290 	return 0;
1291 }
1292 EXPORT_SYMBOL(nci_recv_frame);
1293 
nci_send_frame(struct nci_dev * ndev,struct sk_buff * skb)1294 int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
1295 {
1296 	pr_debug("len %d\n", skb->len);
1297 
1298 	if (!ndev) {
1299 		kfree_skb(skb);
1300 		return -ENODEV;
1301 	}
1302 
1303 	/* Get rid of skb owner, prior to sending to the driver. */
1304 	skb_orphan(skb);
1305 
1306 	/* Send copy to sniffer */
1307 	nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1308 			     RAW_PAYLOAD_NCI, NFC_DIRECTION_TX);
1309 
1310 	return ndev->ops->send(ndev, skb);
1311 }
1312 EXPORT_SYMBOL(nci_send_frame);
1313 
1314 /* Send NCI command */
nci_send_cmd(struct nci_dev * ndev,__u16 opcode,__u8 plen,void * payload)1315 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
1316 {
1317 	struct nci_ctrl_hdr *hdr;
1318 	struct sk_buff *skb;
1319 
1320 	pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
1321 
1322 	skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
1323 	if (!skb) {
1324 		pr_err("no memory for command\n");
1325 		return -ENOMEM;
1326 	}
1327 
1328 	hdr = skb_put(skb, NCI_CTRL_HDR_SIZE);
1329 	hdr->gid = nci_opcode_gid(opcode);
1330 	hdr->oid = nci_opcode_oid(opcode);
1331 	hdr->plen = plen;
1332 
1333 	nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
1334 	nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
1335 
1336 	if (plen)
1337 		skb_put_data(skb, payload, plen);
1338 
1339 	skb_queue_tail(&ndev->cmd_q, skb);
1340 	queue_work(ndev->cmd_wq, &ndev->cmd_work);
1341 
1342 	return 0;
1343 }
1344 EXPORT_SYMBOL(nci_send_cmd);
1345 
1346 /* Proprietary commands API */
ops_cmd_lookup(struct nci_driver_ops * ops,size_t n_ops,__u16 opcode)1347 static struct nci_driver_ops *ops_cmd_lookup(struct nci_driver_ops *ops,
1348 					     size_t n_ops,
1349 					     __u16 opcode)
1350 {
1351 	size_t i;
1352 	struct nci_driver_ops *op;
1353 
1354 	if (!ops || !n_ops)
1355 		return NULL;
1356 
1357 	for (i = 0; i < n_ops; i++) {
1358 		op = &ops[i];
1359 		if (op->opcode == opcode)
1360 			return op;
1361 	}
1362 
1363 	return NULL;
1364 }
1365 
nci_op_rsp_packet(struct nci_dev * ndev,__u16 rsp_opcode,struct sk_buff * skb,struct nci_driver_ops * ops,size_t n_ops)1366 static int nci_op_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode,
1367 			     struct sk_buff *skb, struct nci_driver_ops *ops,
1368 			     size_t n_ops)
1369 {
1370 	struct nci_driver_ops *op;
1371 
1372 	op = ops_cmd_lookup(ops, n_ops, rsp_opcode);
1373 	if (!op || !op->rsp)
1374 		return -ENOTSUPP;
1375 
1376 	return op->rsp(ndev, skb);
1377 }
1378 
nci_op_ntf_packet(struct nci_dev * ndev,__u16 ntf_opcode,struct sk_buff * skb,struct nci_driver_ops * ops,size_t n_ops)1379 static int nci_op_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode,
1380 			     struct sk_buff *skb, struct nci_driver_ops *ops,
1381 			     size_t n_ops)
1382 {
1383 	struct nci_driver_ops *op;
1384 
1385 	op = ops_cmd_lookup(ops, n_ops, ntf_opcode);
1386 	if (!op || !op->ntf)
1387 		return -ENOTSUPP;
1388 
1389 	return op->ntf(ndev, skb);
1390 }
1391 
nci_prop_rsp_packet(struct nci_dev * ndev,__u16 opcode,struct sk_buff * skb)1392 int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1393 			struct sk_buff *skb)
1394 {
1395 	return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1396 				 ndev->ops->n_prop_ops);
1397 }
1398 
nci_prop_ntf_packet(struct nci_dev * ndev,__u16 opcode,struct sk_buff * skb)1399 int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1400 			struct sk_buff *skb)
1401 {
1402 	return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1403 				 ndev->ops->n_prop_ops);
1404 }
1405 
nci_core_rsp_packet(struct nci_dev * ndev,__u16 opcode,struct sk_buff * skb)1406 int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1407 			struct sk_buff *skb)
1408 {
1409 	return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->core_ops,
1410 				  ndev->ops->n_core_ops);
1411 }
1412 
nci_core_ntf_packet(struct nci_dev * ndev,__u16 opcode,struct sk_buff * skb)1413 int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1414 			struct sk_buff *skb)
1415 {
1416 	return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->core_ops,
1417 				 ndev->ops->n_core_ops);
1418 }
1419 
1420 /* ---- NCI TX Data worker thread ---- */
1421 
nci_tx_work(struct work_struct * work)1422 static void nci_tx_work(struct work_struct *work)
1423 {
1424 	struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
1425 	struct nci_conn_info    *conn_info;
1426 	struct sk_buff *skb;
1427 
1428 	conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
1429 	if (!conn_info)
1430 		return;
1431 
1432 	pr_debug("credits_cnt %d\n", atomic_read(&conn_info->credits_cnt));
1433 
1434 	/* Send queued tx data */
1435 	while (atomic_read(&conn_info->credits_cnt)) {
1436 		skb = skb_dequeue(&ndev->tx_q);
1437 		if (!skb)
1438 			return;
1439 
1440 		/* Check if data flow control is used */
1441 		if (atomic_read(&conn_info->credits_cnt) !=
1442 		    NCI_DATA_FLOW_CONTROL_NOT_USED)
1443 			atomic_dec(&conn_info->credits_cnt);
1444 
1445 		pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
1446 			 nci_pbf(skb->data),
1447 			 nci_conn_id(skb->data),
1448 			 nci_plen(skb->data));
1449 
1450 		nci_send_frame(ndev, skb);
1451 
1452 		mod_timer(&ndev->data_timer,
1453 			  jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
1454 	}
1455 }
1456 
1457 /* ----- NCI RX worker thread (data & control) ----- */
1458 
nci_rx_work(struct work_struct * work)1459 static void nci_rx_work(struct work_struct *work)
1460 {
1461 	struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
1462 	struct sk_buff *skb;
1463 
1464 	while ((skb = skb_dequeue(&ndev->rx_q))) {
1465 
1466 		/* Send copy to sniffer */
1467 		nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1468 				     RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
1469 
1470 		/* Process frame */
1471 		switch (nci_mt(skb->data)) {
1472 		case NCI_MT_RSP_PKT:
1473 			nci_rsp_packet(ndev, skb);
1474 			break;
1475 
1476 		case NCI_MT_NTF_PKT:
1477 			nci_ntf_packet(ndev, skb);
1478 			break;
1479 
1480 		case NCI_MT_DATA_PKT:
1481 			nci_rx_data_packet(ndev, skb);
1482 			break;
1483 
1484 		default:
1485 			pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
1486 			kfree_skb(skb);
1487 			break;
1488 		}
1489 	}
1490 
1491 	/* check if a data exchange timout has occurred */
1492 	if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
1493 		/* complete the data exchange transaction, if exists */
1494 		if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1495 			nci_data_exchange_complete(ndev, NULL,
1496 						   ndev->cur_conn_id,
1497 						   -ETIMEDOUT);
1498 
1499 		clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
1500 	}
1501 }
1502 
1503 /* ----- NCI TX CMD worker thread ----- */
1504 
nci_cmd_work(struct work_struct * work)1505 static void nci_cmd_work(struct work_struct *work)
1506 {
1507 	struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
1508 	struct sk_buff *skb;
1509 
1510 	pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
1511 
1512 	/* Send queued command */
1513 	if (atomic_read(&ndev->cmd_cnt)) {
1514 		skb = skb_dequeue(&ndev->cmd_q);
1515 		if (!skb)
1516 			return;
1517 
1518 		atomic_dec(&ndev->cmd_cnt);
1519 
1520 		pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
1521 			 nci_pbf(skb->data),
1522 			 nci_opcode_gid(nci_opcode(skb->data)),
1523 			 nci_opcode_oid(nci_opcode(skb->data)),
1524 			 nci_plen(skb->data));
1525 
1526 		nci_send_frame(ndev, skb);
1527 
1528 		mod_timer(&ndev->cmd_timer,
1529 			  jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
1530 	}
1531 }
1532 
1533 MODULE_LICENSE("GPL");
1534