xref: /openbmc/linux/drivers/nfc/st-nci/se.c (revision 1f012283)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Secure Element driver for STMicroelectronics NFC NCI chip
4  *
5  * Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved.
6  */
7 
8 #include <linux/module.h>
9 #include <linux/nfc.h>
10 #include <linux/delay.h>
11 #include <net/nfc/nci.h>
12 #include <net/nfc/nci_core.h>
13 
14 #include "st-nci.h"
15 
16 struct st_nci_pipe_info {
17 	u8 pipe_state;
18 	u8 src_host_id;
19 	u8 src_gate_id;
20 	u8 dst_host_id;
21 	u8 dst_gate_id;
22 } __packed;
23 
24 /* Hosts */
25 #define ST_NCI_HOST_CONTROLLER_ID     0x00
26 #define ST_NCI_TERMINAL_HOST_ID       0x01
27 #define ST_NCI_UICC_HOST_ID           0x02
28 #define ST_NCI_ESE_HOST_ID            0xc0
29 
30 /* Gates */
31 #define ST_NCI_APDU_READER_GATE       0xf0
32 #define ST_NCI_CONNECTIVITY_GATE      0x41
33 
34 /* Pipes */
35 #define ST_NCI_DEVICE_MGNT_PIPE               0x02
36 
37 /* Connectivity pipe only */
38 #define ST_NCI_SE_COUNT_PIPE_UICC             0x01
39 /* Connectivity + APDU Reader pipe */
40 #define ST_NCI_SE_COUNT_PIPE_EMBEDDED         0x02
41 
42 #define ST_NCI_SE_TO_HOT_PLUG			1000 /* msecs */
43 #define ST_NCI_SE_TO_PIPES			2000
44 
45 #define ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(x)   (x->data[0] & 0x80)
46 
47 #define NCI_HCI_APDU_PARAM_ATR                     0x01
48 #define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY       0x01
49 #define NCI_HCI_ADMIN_PARAM_WHITELIST              0x03
50 #define NCI_HCI_ADMIN_PARAM_HOST_LIST              0x04
51 
52 #define ST_NCI_EVT_SE_HARD_RESET		0x20
53 #define ST_NCI_EVT_TRANSMIT_DATA		0x10
54 #define ST_NCI_EVT_WTX_REQUEST			0x11
55 #define ST_NCI_EVT_SE_SOFT_RESET		0x11
56 #define ST_NCI_EVT_SE_END_OF_APDU_TRANSFER	0x21
57 #define ST_NCI_EVT_HOT_PLUG			0x03
58 
59 #define ST_NCI_SE_MODE_OFF                    0x00
60 #define ST_NCI_SE_MODE_ON                     0x01
61 
62 #define ST_NCI_EVT_CONNECTIVITY       0x10
63 #define ST_NCI_EVT_TRANSACTION        0x12
64 
65 #define ST_NCI_DM_GETINFO             0x13
66 #define ST_NCI_DM_GETINFO_PIPE_LIST   0x02
67 #define ST_NCI_DM_GETINFO_PIPE_INFO   0x01
68 #define ST_NCI_DM_PIPE_CREATED        0x02
69 #define ST_NCI_DM_PIPE_OPEN           0x04
70 #define ST_NCI_DM_RF_ACTIVE           0x80
71 #define ST_NCI_DM_DISCONNECT          0x30
72 
73 #define ST_NCI_DM_IS_PIPE_OPEN(p) \
74 	((p & 0x0f) == (ST_NCI_DM_PIPE_CREATED | ST_NCI_DM_PIPE_OPEN))
75 
76 #define ST_NCI_ATR_DEFAULT_BWI        0x04
77 
78 /*
79  * WT = 2^BWI/10[s], convert into msecs and add a secure
80  * room by increasing by 2 this timeout
81  */
82 #define ST_NCI_BWI_TO_TIMEOUT(x)      ((1 << x) * 200)
83 #define ST_NCI_ATR_GET_Y_FROM_TD(x)   (x >> 4)
84 
85 /* If TA is present bit 0 is set */
86 #define ST_NCI_ATR_TA_PRESENT(x) (x & 0x01)
87 /* If TB is present bit 1 is set */
88 #define ST_NCI_ATR_TB_PRESENT(x) (x & 0x02)
89 
90 #define ST_NCI_NUM_DEVICES           256
91 
92 static DECLARE_BITMAP(dev_mask, ST_NCI_NUM_DEVICES);
93 
94 /* Here are the mandatory pipe for st_nci */
95 static struct nci_hci_gate st_nci_gates[] = {
96 	{NCI_HCI_ADMIN_GATE, NCI_HCI_ADMIN_PIPE,
97 					ST_NCI_HOST_CONTROLLER_ID},
98 	{NCI_HCI_LINK_MGMT_GATE, NCI_HCI_LINK_MGMT_PIPE,
99 					ST_NCI_HOST_CONTROLLER_ID},
100 	{ST_NCI_DEVICE_MGNT_GATE, ST_NCI_DEVICE_MGNT_PIPE,
101 					ST_NCI_HOST_CONTROLLER_ID},
102 
103 	{NCI_HCI_IDENTITY_MGMT_GATE, NCI_HCI_INVALID_PIPE,
104 					ST_NCI_HOST_CONTROLLER_ID},
105 
106 	/* Secure element pipes are created by secure element host */
107 	{ST_NCI_CONNECTIVITY_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
108 					ST_NCI_HOST_CONTROLLER_ID},
109 	{ST_NCI_APDU_READER_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
110 					ST_NCI_HOST_CONTROLLER_ID},
111 };
112 
113 static u8 st_nci_se_get_bwi(struct nci_dev *ndev)
114 {
115 	int i;
116 	u8 td;
117 	struct st_nci_info *info = nci_get_drvdata(ndev);
118 
119 	/* Bits 8 to 5 of the first TB for T=1 encode BWI from zero to nine */
120 	for (i = 1; i < ST_NCI_ESE_MAX_LENGTH; i++) {
121 		td = ST_NCI_ATR_GET_Y_FROM_TD(info->se_info.atr[i]);
122 		if (ST_NCI_ATR_TA_PRESENT(td))
123 			i++;
124 		if (ST_NCI_ATR_TB_PRESENT(td)) {
125 			i++;
126 			return info->se_info.atr[i] >> 4;
127 		}
128 	}
129 	return ST_NCI_ATR_DEFAULT_BWI;
130 }
131 
132 static void st_nci_se_get_atr(struct nci_dev *ndev)
133 {
134 	struct st_nci_info *info = nci_get_drvdata(ndev);
135 	int r;
136 	struct sk_buff *skb;
137 
138 	r = nci_hci_get_param(ndev, ST_NCI_APDU_READER_GATE,
139 				NCI_HCI_APDU_PARAM_ATR, &skb);
140 	if (r < 0)
141 		return;
142 
143 	if (skb->len <= ST_NCI_ESE_MAX_LENGTH) {
144 		memcpy(info->se_info.atr, skb->data, skb->len);
145 
146 		info->se_info.wt_timeout =
147 			ST_NCI_BWI_TO_TIMEOUT(st_nci_se_get_bwi(ndev));
148 	}
149 	kfree_skb(skb);
150 }
151 
152 int st_nci_hci_load_session(struct nci_dev *ndev)
153 {
154 	int i, j, r;
155 	struct sk_buff *skb_pipe_list, *skb_pipe_info;
156 	struct st_nci_pipe_info *dm_pipe_info;
157 	u8 pipe_list[] = { ST_NCI_DM_GETINFO_PIPE_LIST,
158 			ST_NCI_TERMINAL_HOST_ID};
159 	u8 pipe_info[] = { ST_NCI_DM_GETINFO_PIPE_INFO,
160 			ST_NCI_TERMINAL_HOST_ID, 0};
161 
162 	/* On ST_NCI device pipes number are dynamics
163 	 * If pipes are already created, hci_dev_up will fail.
164 	 * Doing a clear all pipe is a bad idea because:
165 	 * - It does useless EEPROM cycling
166 	 * - It might cause issue for secure elements support
167 	 * (such as removing connectivity or APDU reader pipe)
168 	 * A better approach on ST_NCI is to:
169 	 * - get a pipe list for each host.
170 	 * (eg: ST_NCI_HOST_CONTROLLER_ID for now).
171 	 * (TODO Later on UICC HOST and eSE HOST)
172 	 * - get pipe information
173 	 * - match retrieved pipe list in st_nci_gates
174 	 * ST_NCI_DEVICE_MGNT_GATE is a proprietary gate
175 	 * with ST_NCI_DEVICE_MGNT_PIPE.
176 	 * Pipe can be closed and need to be open.
177 	 */
178 	r = nci_hci_connect_gate(ndev, ST_NCI_HOST_CONTROLLER_ID,
179 				ST_NCI_DEVICE_MGNT_GATE,
180 				ST_NCI_DEVICE_MGNT_PIPE);
181 	if (r < 0)
182 		return r;
183 
184 	/* Get pipe list */
185 	r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
186 			ST_NCI_DM_GETINFO, pipe_list, sizeof(pipe_list),
187 			&skb_pipe_list);
188 	if (r < 0)
189 		return r;
190 
191 	/* Complete the existing gate_pipe table */
192 	for (i = 0; i < skb_pipe_list->len; i++) {
193 		pipe_info[2] = skb_pipe_list->data[i];
194 		r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
195 					ST_NCI_DM_GETINFO, pipe_info,
196 					sizeof(pipe_info), &skb_pipe_info);
197 
198 		if (r)
199 			continue;
200 
201 		/*
202 		 * Match pipe ID and gate ID
203 		 * Output format from ST21NFC_DM_GETINFO is:
204 		 * - pipe state (1byte)
205 		 * - source hid (1byte)
206 		 * - source gid (1byte)
207 		 * - destination hid (1byte)
208 		 * - destination gid (1byte)
209 		 */
210 		dm_pipe_info = (struct st_nci_pipe_info *)skb_pipe_info->data;
211 		if (dm_pipe_info->dst_gate_id == ST_NCI_APDU_READER_GATE &&
212 		    dm_pipe_info->src_host_id == ST_NCI_UICC_HOST_ID) {
213 			pr_err("Unexpected apdu_reader pipe on host %x\n",
214 			       dm_pipe_info->src_host_id);
215 			kfree_skb(skb_pipe_info);
216 			continue;
217 		}
218 
219 		for (j = 3; (j < ARRAY_SIZE(st_nci_gates)) &&
220 		     (st_nci_gates[j].gate != dm_pipe_info->dst_gate_id); j++)
221 			;
222 
223 		if (j < ARRAY_SIZE(st_nci_gates) &&
224 		    st_nci_gates[j].gate == dm_pipe_info->dst_gate_id &&
225 		    ST_NCI_DM_IS_PIPE_OPEN(dm_pipe_info->pipe_state)) {
226 			ndev->hci_dev->init_data.gates[j].pipe = pipe_info[2];
227 
228 			ndev->hci_dev->gate2pipe[st_nci_gates[j].gate] =
229 						pipe_info[2];
230 			ndev->hci_dev->pipes[pipe_info[2]].gate =
231 						st_nci_gates[j].gate;
232 			ndev->hci_dev->pipes[pipe_info[2]].host =
233 						dm_pipe_info->src_host_id;
234 		}
235 		kfree_skb(skb_pipe_info);
236 	}
237 
238 	/*
239 	 * 3 gates have a well known pipe ID. Only NCI_HCI_LINK_MGMT_GATE
240 	 * is not yet open at this stage.
241 	 */
242 	r = nci_hci_connect_gate(ndev, ST_NCI_HOST_CONTROLLER_ID,
243 				 NCI_HCI_LINK_MGMT_GATE,
244 				 NCI_HCI_LINK_MGMT_PIPE);
245 
246 	kfree_skb(skb_pipe_list);
247 	return r;
248 }
249 EXPORT_SYMBOL_GPL(st_nci_hci_load_session);
250 
251 static void st_nci_hci_admin_event_received(struct nci_dev *ndev,
252 					      u8 event, struct sk_buff *skb)
253 {
254 	struct st_nci_info *info = nci_get_drvdata(ndev);
255 
256 	switch (event) {
257 	case ST_NCI_EVT_HOT_PLUG:
258 		if (info->se_info.se_active) {
259 			if (!ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
260 				del_timer_sync(&info->se_info.se_active_timer);
261 				info->se_info.se_active = false;
262 				complete(&info->se_info.req_completion);
263 			} else {
264 				mod_timer(&info->se_info.se_active_timer,
265 				      jiffies +
266 				      msecs_to_jiffies(ST_NCI_SE_TO_PIPES));
267 			}
268 		}
269 	break;
270 	default:
271 		nfc_err(&ndev->nfc_dev->dev, "Unexpected event on admin gate\n");
272 	}
273 }
274 
275 static int st_nci_hci_apdu_reader_event_received(struct nci_dev *ndev,
276 						   u8 event,
277 						   struct sk_buff *skb)
278 {
279 	struct st_nci_info *info = nci_get_drvdata(ndev);
280 
281 	pr_debug("apdu reader gate event: %x\n", event);
282 
283 	switch (event) {
284 	case ST_NCI_EVT_TRANSMIT_DATA:
285 		del_timer_sync(&info->se_info.bwi_timer);
286 		info->se_info.bwi_active = false;
287 		info->se_info.cb(info->se_info.cb_context,
288 				 skb->data, skb->len, 0);
289 	break;
290 	case ST_NCI_EVT_WTX_REQUEST:
291 		mod_timer(&info->se_info.bwi_timer, jiffies +
292 			  msecs_to_jiffies(info->se_info.wt_timeout));
293 	break;
294 	default:
295 		nfc_err(&ndev->nfc_dev->dev, "Unexpected event on apdu reader gate\n");
296 		return 1;
297 	}
298 
299 	kfree_skb(skb);
300 	return 0;
301 }
302 
303 /*
304  * Returns:
305  * <= 0: driver handled the event, skb consumed
306  *    1: driver does not handle the event, please do standard processing
307  */
308 static int st_nci_hci_connectivity_event_received(struct nci_dev *ndev,
309 						u8 host, u8 event,
310 						struct sk_buff *skb)
311 {
312 	int r = 0;
313 	struct device *dev = &ndev->nfc_dev->dev;
314 	struct nfc_evt_transaction *transaction;
315 
316 	pr_debug("connectivity gate event: %x\n", event);
317 
318 	switch (event) {
319 	case ST_NCI_EVT_CONNECTIVITY:
320 		r = nfc_se_connectivity(ndev->nfc_dev, host);
321 	break;
322 	case ST_NCI_EVT_TRANSACTION:
323 		/* According to specification etsi 102 622
324 		 * 11.2.2.4 EVT_TRANSACTION Table 52
325 		 * Description  Tag     Length
326 		 * AID          81      5 to 16
327 		 * PARAMETERS   82      0 to 255
328 		 */
329 		if (skb->len < NFC_MIN_AID_LENGTH + 2 &&
330 		    skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)
331 			return -EPROTO;
332 
333 		transaction = devm_kzalloc(dev, skb->len - 2, GFP_KERNEL);
334 		if (!transaction)
335 			return -ENOMEM;
336 
337 		transaction->aid_len = skb->data[1];
338 		memcpy(transaction->aid, &skb->data[2], transaction->aid_len);
339 
340 		/* Check next byte is PARAMETERS tag (82) */
341 		if (skb->data[transaction->aid_len + 2] !=
342 		    NFC_EVT_TRANSACTION_PARAMS_TAG)
343 			return -EPROTO;
344 
345 		transaction->params_len = skb->data[transaction->aid_len + 3];
346 		memcpy(transaction->params, skb->data +
347 		       transaction->aid_len + 4, transaction->params_len);
348 
349 		r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
350 		break;
351 	default:
352 		nfc_err(&ndev->nfc_dev->dev, "Unexpected event on connectivity gate\n");
353 		return 1;
354 	}
355 	kfree_skb(skb);
356 	return r;
357 }
358 
359 void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
360 				 u8 event, struct sk_buff *skb)
361 {
362 	u8 gate = ndev->hci_dev->pipes[pipe].gate;
363 	u8 host = ndev->hci_dev->pipes[pipe].host;
364 
365 	switch (gate) {
366 	case NCI_HCI_ADMIN_GATE:
367 		st_nci_hci_admin_event_received(ndev, event, skb);
368 	break;
369 	case ST_NCI_APDU_READER_GATE:
370 		st_nci_hci_apdu_reader_event_received(ndev, event, skb);
371 	break;
372 	case ST_NCI_CONNECTIVITY_GATE:
373 		st_nci_hci_connectivity_event_received(ndev, host, event, skb);
374 	break;
375 	}
376 }
377 EXPORT_SYMBOL_GPL(st_nci_hci_event_received);
378 
379 void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
380 			       struct sk_buff *skb)
381 {
382 	struct st_nci_info *info = nci_get_drvdata(ndev);
383 	u8 gate = ndev->hci_dev->pipes[pipe].gate;
384 
385 	pr_debug("cmd: %x\n", cmd);
386 
387 	switch (cmd) {
388 	case NCI_HCI_ANY_OPEN_PIPE:
389 		if (gate != ST_NCI_APDU_READER_GATE &&
390 		    ndev->hci_dev->pipes[pipe].host != ST_NCI_UICC_HOST_ID)
391 			ndev->hci_dev->count_pipes++;
392 
393 		if (ndev->hci_dev->count_pipes ==
394 		    ndev->hci_dev->expected_pipes) {
395 			del_timer_sync(&info->se_info.se_active_timer);
396 			info->se_info.se_active = false;
397 			ndev->hci_dev->count_pipes = 0;
398 			complete(&info->se_info.req_completion);
399 		}
400 	break;
401 	}
402 }
403 EXPORT_SYMBOL_GPL(st_nci_hci_cmd_received);
404 
405 static int st_nci_control_se(struct nci_dev *ndev, u8 se_idx,
406 			     u8 state)
407 {
408 	struct st_nci_info *info = nci_get_drvdata(ndev);
409 	int r, i;
410 	struct sk_buff *sk_host_list;
411 	u8 host_id;
412 
413 	switch (se_idx) {
414 	case ST_NCI_UICC_HOST_ID:
415 		ndev->hci_dev->count_pipes = 0;
416 		ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_UICC;
417 		break;
418 	case ST_NCI_ESE_HOST_ID:
419 		ndev->hci_dev->count_pipes = 0;
420 		ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_EMBEDDED;
421 		break;
422 	default:
423 		return -EINVAL;
424 	}
425 
426 	/*
427 	 * Wait for an EVT_HOT_PLUG in order to
428 	 * retrieve a relevant host list.
429 	 */
430 	reinit_completion(&info->se_info.req_completion);
431 	r = nci_nfcee_mode_set(ndev, se_idx, state);
432 	if (r != NCI_STATUS_OK)
433 		return r;
434 
435 	mod_timer(&info->se_info.se_active_timer, jiffies +
436 		msecs_to_jiffies(ST_NCI_SE_TO_HOT_PLUG));
437 	info->se_info.se_active = true;
438 
439 	/* Ignore return value and check in any case the host_list */
440 	wait_for_completion_interruptible(&info->se_info.req_completion);
441 
442 	/* There might be some "collision" after receiving a HOT_PLUG event
443 	 * This may cause the CLF to not answer to the next hci command.
444 	 * There is no possible synchronization to prevent this.
445 	 * Adding a small delay is the only way to solve the issue.
446 	 */
447 	if (info->se_info.se_status->is_ese_present &&
448 	    info->se_info.se_status->is_uicc_present)
449 		usleep_range(15000, 20000);
450 
451 	r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
452 			NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
453 	if (r != NCI_HCI_ANY_OK)
454 		return r;
455 
456 	for (i = 0; i < sk_host_list->len &&
457 		sk_host_list->data[i] != se_idx; i++)
458 		;
459 	host_id = sk_host_list->data[i];
460 	kfree_skb(sk_host_list);
461 	if (state == ST_NCI_SE_MODE_ON && host_id == se_idx)
462 		return se_idx;
463 	else if (state == ST_NCI_SE_MODE_OFF && host_id != se_idx)
464 		return se_idx;
465 
466 	return -1;
467 }
468 
469 int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
470 {
471 	int r;
472 
473 	/*
474 	 * According to upper layer, se_idx == NFC_SE_UICC when
475 	 * info->se_info.se_status->is_uicc_enable is true should never happen
476 	 * Same for eSE.
477 	 */
478 	r = st_nci_control_se(ndev, se_idx, ST_NCI_SE_MODE_OFF);
479 	if (r < 0) {
480 		/* Do best effort to release SWP */
481 		if (se_idx == NFC_SE_EMBEDDED) {
482 			r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
483 					ST_NCI_EVT_SE_END_OF_APDU_TRANSFER,
484 					NULL, 0);
485 		}
486 		return r;
487 	}
488 
489 	return 0;
490 }
491 EXPORT_SYMBOL_GPL(st_nci_disable_se);
492 
493 int st_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
494 {
495 	int r;
496 
497 	/*
498 	 * According to upper layer, se_idx == NFC_SE_UICC when
499 	 * info->se_info.se_status->is_uicc_enable is true should never happen.
500 	 * Same for eSE.
501 	 */
502 	r = st_nci_control_se(ndev, se_idx, ST_NCI_SE_MODE_ON);
503 	if (r == ST_NCI_ESE_HOST_ID) {
504 		st_nci_se_get_atr(ndev);
505 		r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
506 				ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
507 	}
508 
509 	if (r < 0) {
510 		/*
511 		 * The activation procedure failed, the secure element
512 		 * is not connected. Remove from the list.
513 		 */
514 		nfc_remove_se(ndev->nfc_dev, se_idx);
515 		return r;
516 	}
517 
518 	return 0;
519 }
520 EXPORT_SYMBOL_GPL(st_nci_enable_se);
521 
522 static int st_nci_hci_network_init(struct nci_dev *ndev)
523 {
524 	struct st_nci_info *info = nci_get_drvdata(ndev);
525 	struct core_conn_create_dest_spec_params *dest_params;
526 	struct dest_spec_params spec_params;
527 	struct nci_conn_info    *conn_info;
528 	int r, dev_num;
529 
530 	dest_params =
531 		kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
532 			sizeof(struct dest_spec_params), GFP_KERNEL);
533 	if (dest_params == NULL)
534 		return -ENOMEM;
535 
536 	dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
537 	dest_params->length = sizeof(struct dest_spec_params);
538 	spec_params.id = ndev->hci_dev->nfcee_id;
539 	spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
540 	memcpy(dest_params->value, &spec_params,
541 	       sizeof(struct dest_spec_params));
542 	r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
543 				 sizeof(struct core_conn_create_dest_spec_params) +
544 				 sizeof(struct dest_spec_params),
545 				 dest_params);
546 	if (r != NCI_STATUS_OK)
547 		goto free_dest_params;
548 
549 	conn_info = ndev->hci_dev->conn_info;
550 	if (!conn_info)
551 		goto free_dest_params;
552 
553 	ndev->hci_dev->init_data.gate_count = ARRAY_SIZE(st_nci_gates);
554 	memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
555 	       sizeof(st_nci_gates));
556 
557 	/*
558 	 * Session id must include the driver name + i2c bus addr
559 	 * persistent info to discriminate 2 identical chips
560 	 */
561 	dev_num = find_first_zero_bit(dev_mask, ST_NCI_NUM_DEVICES);
562 	if (dev_num >= ST_NCI_NUM_DEVICES) {
563 		r = -ENODEV;
564 		goto free_dest_params;
565 	}
566 
567 	scnprintf(ndev->hci_dev->init_data.session_id,
568 		  sizeof(ndev->hci_dev->init_data.session_id),
569 		  "%s%2x", "ST21BH", dev_num);
570 
571 	r = nci_hci_dev_session_init(ndev);
572 	if (r != NCI_HCI_ANY_OK)
573 		goto free_dest_params;
574 
575 	/*
576 	 * In factory mode, we prevent secure elements activation
577 	 * by disabling nfcee on the current HCI connection id.
578 	 * HCI will be used here only for proprietary commands.
579 	 */
580 	if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
581 		r = nci_nfcee_mode_set(ndev,
582 				       ndev->hci_dev->conn_info->dest_params->id,
583 				       NCI_NFCEE_DISABLE);
584 	else
585 		r = nci_nfcee_mode_set(ndev,
586 				       ndev->hci_dev->conn_info->dest_params->id,
587 				       NCI_NFCEE_ENABLE);
588 
589 free_dest_params:
590 	kfree(dest_params);
591 	return r;
592 }
593 
594 int st_nci_discover_se(struct nci_dev *ndev)
595 {
596 	u8 white_list[2];
597 	int r, wl_size = 0;
598 	int se_count = 0;
599 	struct st_nci_info *info = nci_get_drvdata(ndev);
600 
601 	r = st_nci_hci_network_init(ndev);
602 	if (r != 0)
603 		return r;
604 
605 	if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
606 		return 0;
607 
608 	if (info->se_info.se_status->is_uicc_present)
609 		white_list[wl_size++] = ST_NCI_UICC_HOST_ID;
610 	if (info->se_info.se_status->is_ese_present)
611 		white_list[wl_size++] = ST_NCI_ESE_HOST_ID;
612 
613 	if (wl_size) {
614 		r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
615 				      NCI_HCI_ADMIN_PARAM_WHITELIST,
616 				      white_list, wl_size);
617 		if (r != NCI_HCI_ANY_OK)
618 			return r;
619 	}
620 
621 	if (info->se_info.se_status->is_uicc_present) {
622 		nfc_add_se(ndev->nfc_dev, ST_NCI_UICC_HOST_ID, NFC_SE_UICC);
623 		se_count++;
624 	}
625 
626 	if (info->se_info.se_status->is_ese_present) {
627 		nfc_add_se(ndev->nfc_dev, ST_NCI_ESE_HOST_ID, NFC_SE_EMBEDDED);
628 		se_count++;
629 	}
630 
631 	return !se_count;
632 }
633 EXPORT_SYMBOL_GPL(st_nci_discover_se);
634 
635 int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
636 		       u8 *apdu, size_t apdu_length,
637 		       se_io_cb_t cb, void *cb_context)
638 {
639 	struct st_nci_info *info = nci_get_drvdata(ndev);
640 
641 	switch (se_idx) {
642 	case ST_NCI_ESE_HOST_ID:
643 		info->se_info.cb = cb;
644 		info->se_info.cb_context = cb_context;
645 		mod_timer(&info->se_info.bwi_timer, jiffies +
646 			  msecs_to_jiffies(info->se_info.wt_timeout));
647 		info->se_info.bwi_active = true;
648 		return nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
649 					ST_NCI_EVT_TRANSMIT_DATA, apdu,
650 					apdu_length);
651 	default:
652 		return -ENODEV;
653 	}
654 }
655 EXPORT_SYMBOL(st_nci_se_io);
656 
657 static void st_nci_se_wt_timeout(struct timer_list *t)
658 {
659 	/*
660 	 * No answer from the secure element
661 	 * within the defined timeout.
662 	 * Let's send a reset request as recovery procedure.
663 	 * According to the situation, we first try to send a software reset
664 	 * to the secure element. If the next command is still not
665 	 * answering in time, we send to the CLF a secure element hardware
666 	 * reset request.
667 	 */
668 	/* hardware reset managed through VCC_UICC_OUT power supply */
669 	u8 param = 0x01;
670 	struct st_nci_info *info = from_timer(info, t, se_info.bwi_timer);
671 
672 	info->se_info.bwi_active = false;
673 
674 	if (!info->se_info.xch_error) {
675 		info->se_info.xch_error = true;
676 		nci_hci_send_event(info->ndlc->ndev, ST_NCI_APDU_READER_GATE,
677 				ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
678 	} else {
679 		info->se_info.xch_error = false;
680 		nci_hci_send_event(info->ndlc->ndev, ST_NCI_DEVICE_MGNT_GATE,
681 				ST_NCI_EVT_SE_HARD_RESET, &param, 1);
682 	}
683 	info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
684 }
685 
686 static void st_nci_se_activation_timeout(struct timer_list *t)
687 {
688 	struct st_nci_info *info = from_timer(info, t,
689 					      se_info.se_active_timer);
690 
691 	info->se_info.se_active = false;
692 
693 	complete(&info->se_info.req_completion);
694 }
695 
696 int st_nci_se_init(struct nci_dev *ndev, struct st_nci_se_status *se_status)
697 {
698 	struct st_nci_info *info = nci_get_drvdata(ndev);
699 
700 	init_completion(&info->se_info.req_completion);
701 	/* initialize timers */
702 	timer_setup(&info->se_info.bwi_timer, st_nci_se_wt_timeout, 0);
703 	info->se_info.bwi_active = false;
704 
705 	timer_setup(&info->se_info.se_active_timer,
706 		    st_nci_se_activation_timeout, 0);
707 	info->se_info.se_active = false;
708 
709 	info->se_info.xch_error = false;
710 
711 	info->se_info.wt_timeout =
712 		ST_NCI_BWI_TO_TIMEOUT(ST_NCI_ATR_DEFAULT_BWI);
713 
714 	info->se_info.se_status = se_status;
715 
716 	return 0;
717 }
718 EXPORT_SYMBOL(st_nci_se_init);
719 
720 void st_nci_se_deinit(struct nci_dev *ndev)
721 {
722 	struct st_nci_info *info = nci_get_drvdata(ndev);
723 
724 	if (info->se_info.bwi_active)
725 		del_timer_sync(&info->se_info.bwi_timer);
726 	if (info->se_info.se_active)
727 		del_timer_sync(&info->se_info.se_active_timer);
728 
729 	info->se_info.se_active = false;
730 	info->se_info.bwi_active = false;
731 }
732 EXPORT_SYMBOL(st_nci_se_deinit);
733 
734