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
st_nci_se_get_bwi(struct nci_dev * ndev)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
st_nci_se_get_atr(struct nci_dev * ndev)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
st_nci_hci_load_session(struct nci_dev * ndev)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
st_nci_hci_admin_event_received(struct nci_dev * ndev,u8 event,struct sk_buff * skb)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
st_nci_hci_apdu_reader_event_received(struct nci_dev * ndev,u8 event,struct sk_buff * skb)275 static int st_nci_hci_apdu_reader_event_received(struct nci_dev *ndev,
276 u8 event,
277 struct sk_buff *skb)
278 {
279 int r = 0;
280 struct st_nci_info *info = nci_get_drvdata(ndev);
281
282 pr_debug("apdu reader gate event: %x\n", event);
283
284 switch (event) {
285 case ST_NCI_EVT_TRANSMIT_DATA:
286 del_timer_sync(&info->se_info.bwi_timer);
287 info->se_info.bwi_active = false;
288 info->se_info.cb(info->se_info.cb_context,
289 skb->data, skb->len, 0);
290 break;
291 case ST_NCI_EVT_WTX_REQUEST:
292 mod_timer(&info->se_info.bwi_timer, jiffies +
293 msecs_to_jiffies(info->se_info.wt_timeout));
294 break;
295 default:
296 nfc_err(&ndev->nfc_dev->dev, "Unexpected event on apdu reader gate\n");
297 return 1;
298 }
299
300 kfree_skb(skb);
301 return r;
302 }
303
304 /*
305 * Returns:
306 * <= 0: driver handled the event, skb consumed
307 * 1: driver does not handle the event, please do standard processing
308 */
st_nci_hci_connectivity_event_received(struct nci_dev * ndev,u8 host,u8 event,struct sk_buff * skb)309 static int st_nci_hci_connectivity_event_received(struct nci_dev *ndev,
310 u8 host, u8 event,
311 struct sk_buff *skb)
312 {
313 int r = 0;
314 struct device *dev = &ndev->nfc_dev->dev;
315 struct nfc_evt_transaction *transaction;
316
317 pr_debug("connectivity gate event: %x\n", event);
318
319 switch (event) {
320 case ST_NCI_EVT_CONNECTIVITY:
321 r = nfc_se_connectivity(ndev->nfc_dev, host);
322 break;
323 case ST_NCI_EVT_TRANSACTION:
324 /* According to specification etsi 102 622
325 * 11.2.2.4 EVT_TRANSACTION Table 52
326 * Description Tag Length
327 * AID 81 5 to 16
328 * PARAMETERS 82 0 to 255
329 */
330 if (skb->len < NFC_MIN_AID_LENGTH + 2 &&
331 skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)
332 return -EPROTO;
333
334 transaction = devm_kzalloc(dev, skb->len - 2, GFP_KERNEL);
335 if (!transaction)
336 return -ENOMEM;
337
338 transaction->aid_len = skb->data[1];
339 memcpy(transaction->aid, &skb->data[2], transaction->aid_len);
340
341 /* Check next byte is PARAMETERS tag (82) */
342 if (skb->data[transaction->aid_len + 2] !=
343 NFC_EVT_TRANSACTION_PARAMS_TAG)
344 return -EPROTO;
345
346 transaction->params_len = skb->data[transaction->aid_len + 3];
347 memcpy(transaction->params, skb->data +
348 transaction->aid_len + 4, transaction->params_len);
349
350 r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
351 break;
352 default:
353 nfc_err(&ndev->nfc_dev->dev, "Unexpected event on connectivity gate\n");
354 return 1;
355 }
356 kfree_skb(skb);
357 return r;
358 }
359
st_nci_hci_event_received(struct nci_dev * ndev,u8 pipe,u8 event,struct sk_buff * skb)360 void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
361 u8 event, struct sk_buff *skb)
362 {
363 u8 gate = ndev->hci_dev->pipes[pipe].gate;
364 u8 host = ndev->hci_dev->pipes[pipe].host;
365
366 switch (gate) {
367 case NCI_HCI_ADMIN_GATE:
368 st_nci_hci_admin_event_received(ndev, event, skb);
369 break;
370 case ST_NCI_APDU_READER_GATE:
371 st_nci_hci_apdu_reader_event_received(ndev, event, skb);
372 break;
373 case ST_NCI_CONNECTIVITY_GATE:
374 st_nci_hci_connectivity_event_received(ndev, host, event, skb);
375 break;
376 }
377 }
378 EXPORT_SYMBOL_GPL(st_nci_hci_event_received);
379
st_nci_hci_cmd_received(struct nci_dev * ndev,u8 pipe,u8 cmd,struct sk_buff * skb)380 void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
381 struct sk_buff *skb)
382 {
383 struct st_nci_info *info = nci_get_drvdata(ndev);
384 u8 gate = ndev->hci_dev->pipes[pipe].gate;
385
386 pr_debug("cmd: %x\n", cmd);
387
388 switch (cmd) {
389 case NCI_HCI_ANY_OPEN_PIPE:
390 if (gate != ST_NCI_APDU_READER_GATE &&
391 ndev->hci_dev->pipes[pipe].host != ST_NCI_UICC_HOST_ID)
392 ndev->hci_dev->count_pipes++;
393
394 if (ndev->hci_dev->count_pipes ==
395 ndev->hci_dev->expected_pipes) {
396 del_timer_sync(&info->se_info.se_active_timer);
397 info->se_info.se_active = false;
398 ndev->hci_dev->count_pipes = 0;
399 complete(&info->se_info.req_completion);
400 }
401 break;
402 }
403 }
404 EXPORT_SYMBOL_GPL(st_nci_hci_cmd_received);
405
st_nci_control_se(struct nci_dev * ndev,u8 se_idx,u8 state)406 static int st_nci_control_se(struct nci_dev *ndev, u8 se_idx,
407 u8 state)
408 {
409 struct st_nci_info *info = nci_get_drvdata(ndev);
410 int r, i;
411 struct sk_buff *sk_host_list;
412 u8 host_id;
413
414 switch (se_idx) {
415 case ST_NCI_UICC_HOST_ID:
416 ndev->hci_dev->count_pipes = 0;
417 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_UICC;
418 break;
419 case ST_NCI_ESE_HOST_ID:
420 ndev->hci_dev->count_pipes = 0;
421 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_EMBEDDED;
422 break;
423 default:
424 return -EINVAL;
425 }
426
427 /*
428 * Wait for an EVT_HOT_PLUG in order to
429 * retrieve a relevant host list.
430 */
431 reinit_completion(&info->se_info.req_completion);
432 r = nci_nfcee_mode_set(ndev, se_idx, state);
433 if (r != NCI_STATUS_OK)
434 return r;
435
436 mod_timer(&info->se_info.se_active_timer, jiffies +
437 msecs_to_jiffies(ST_NCI_SE_TO_HOT_PLUG));
438 info->se_info.se_active = true;
439
440 /* Ignore return value and check in any case the host_list */
441 wait_for_completion_interruptible(&info->se_info.req_completion);
442
443 /* There might be some "collision" after receiving a HOT_PLUG event
444 * This may cause the CLF to not answer to the next hci command.
445 * There is no possible synchronization to prevent this.
446 * Adding a small delay is the only way to solve the issue.
447 */
448 if (info->se_info.se_status->is_ese_present &&
449 info->se_info.se_status->is_uicc_present)
450 usleep_range(15000, 20000);
451
452 r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
453 NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
454 if (r != NCI_HCI_ANY_OK)
455 return r;
456
457 for (i = 0; i < sk_host_list->len &&
458 sk_host_list->data[i] != se_idx; i++)
459 ;
460 host_id = sk_host_list->data[i];
461 kfree_skb(sk_host_list);
462 if (state == ST_NCI_SE_MODE_ON && host_id == se_idx)
463 return se_idx;
464 else if (state == ST_NCI_SE_MODE_OFF && host_id != se_idx)
465 return se_idx;
466
467 return -1;
468 }
469
st_nci_disable_se(struct nci_dev * ndev,u32 se_idx)470 int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
471 {
472 int r;
473
474 pr_debug("st_nci_disable_se\n");
475
476 /*
477 * According to upper layer, se_idx == NFC_SE_UICC when
478 * info->se_info.se_status->is_uicc_enable is true should never happen
479 * Same for eSE.
480 */
481 r = st_nci_control_se(ndev, se_idx, ST_NCI_SE_MODE_OFF);
482 if (r < 0) {
483 /* Do best effort to release SWP */
484 if (se_idx == NFC_SE_EMBEDDED) {
485 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
486 ST_NCI_EVT_SE_END_OF_APDU_TRANSFER,
487 NULL, 0);
488 }
489 return r;
490 }
491
492 return 0;
493 }
494 EXPORT_SYMBOL_GPL(st_nci_disable_se);
495
st_nci_enable_se(struct nci_dev * ndev,u32 se_idx)496 int st_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
497 {
498 int r;
499
500 pr_debug("st_nci_enable_se\n");
501
502 /*
503 * According to upper layer, se_idx == NFC_SE_UICC when
504 * info->se_info.se_status->is_uicc_enable is true should never happen.
505 * Same for eSE.
506 */
507 r = st_nci_control_se(ndev, se_idx, ST_NCI_SE_MODE_ON);
508 if (r == ST_NCI_ESE_HOST_ID) {
509 st_nci_se_get_atr(ndev);
510 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
511 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
512 }
513
514 if (r < 0) {
515 /*
516 * The activation procedure failed, the secure element
517 * is not connected. Remove from the list.
518 */
519 nfc_remove_se(ndev->nfc_dev, se_idx);
520 return r;
521 }
522
523 return 0;
524 }
525 EXPORT_SYMBOL_GPL(st_nci_enable_se);
526
st_nci_hci_network_init(struct nci_dev * ndev)527 static int st_nci_hci_network_init(struct nci_dev *ndev)
528 {
529 struct st_nci_info *info = nci_get_drvdata(ndev);
530 struct core_conn_create_dest_spec_params *dest_params;
531 struct dest_spec_params spec_params;
532 struct nci_conn_info *conn_info;
533 int r, dev_num;
534
535 dest_params =
536 kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
537 sizeof(struct dest_spec_params), GFP_KERNEL);
538 if (dest_params == NULL) {
539 r = -ENOMEM;
540 goto exit;
541 }
542
543 dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
544 dest_params->length = sizeof(struct dest_spec_params);
545 spec_params.id = ndev->hci_dev->nfcee_id;
546 spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
547 memcpy(dest_params->value, &spec_params,
548 sizeof(struct dest_spec_params));
549 r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
550 sizeof(struct core_conn_create_dest_spec_params) +
551 sizeof(struct dest_spec_params),
552 dest_params);
553 if (r != NCI_STATUS_OK)
554 goto free_dest_params;
555
556 conn_info = ndev->hci_dev->conn_info;
557 if (!conn_info)
558 goto free_dest_params;
559
560 ndev->hci_dev->init_data.gate_count = ARRAY_SIZE(st_nci_gates);
561 memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
562 sizeof(st_nci_gates));
563
564 /*
565 * Session id must include the driver name + i2c bus addr
566 * persistent info to discriminate 2 identical chips
567 */
568 dev_num = find_first_zero_bit(dev_mask, ST_NCI_NUM_DEVICES);
569 if (dev_num >= ST_NCI_NUM_DEVICES) {
570 r = -ENODEV;
571 goto free_dest_params;
572 }
573
574 scnprintf(ndev->hci_dev->init_data.session_id,
575 sizeof(ndev->hci_dev->init_data.session_id),
576 "%s%2x", "ST21BH", dev_num);
577
578 r = nci_hci_dev_session_init(ndev);
579 if (r != NCI_HCI_ANY_OK)
580 goto free_dest_params;
581
582 /*
583 * In factory mode, we prevent secure elements activation
584 * by disabling nfcee on the current HCI connection id.
585 * HCI will be used here only for proprietary commands.
586 */
587 if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
588 r = nci_nfcee_mode_set(ndev,
589 ndev->hci_dev->conn_info->dest_params->id,
590 NCI_NFCEE_DISABLE);
591 else
592 r = nci_nfcee_mode_set(ndev,
593 ndev->hci_dev->conn_info->dest_params->id,
594 NCI_NFCEE_ENABLE);
595
596 free_dest_params:
597 kfree(dest_params);
598
599 exit:
600 return r;
601 }
602
st_nci_discover_se(struct nci_dev * ndev)603 int st_nci_discover_se(struct nci_dev *ndev)
604 {
605 u8 white_list[2];
606 int r, wl_size = 0;
607 int se_count = 0;
608 struct st_nci_info *info = nci_get_drvdata(ndev);
609
610 pr_debug("st_nci_discover_se\n");
611
612 r = st_nci_hci_network_init(ndev);
613 if (r != 0)
614 return r;
615
616 if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
617 return 0;
618
619 if (info->se_info.se_status->is_uicc_present)
620 white_list[wl_size++] = ST_NCI_UICC_HOST_ID;
621 if (info->se_info.se_status->is_ese_present)
622 white_list[wl_size++] = ST_NCI_ESE_HOST_ID;
623
624 if (wl_size) {
625 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
626 NCI_HCI_ADMIN_PARAM_WHITELIST,
627 white_list, wl_size);
628 if (r != NCI_HCI_ANY_OK)
629 return r;
630 }
631
632 if (info->se_info.se_status->is_uicc_present) {
633 nfc_add_se(ndev->nfc_dev, ST_NCI_UICC_HOST_ID, NFC_SE_UICC);
634 se_count++;
635 }
636
637 if (info->se_info.se_status->is_ese_present) {
638 nfc_add_se(ndev->nfc_dev, ST_NCI_ESE_HOST_ID, NFC_SE_EMBEDDED);
639 se_count++;
640 }
641
642 return !se_count;
643 }
644 EXPORT_SYMBOL_GPL(st_nci_discover_se);
645
st_nci_se_io(struct nci_dev * ndev,u32 se_idx,u8 * apdu,size_t apdu_length,se_io_cb_t cb,void * cb_context)646 int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
647 u8 *apdu, size_t apdu_length,
648 se_io_cb_t cb, void *cb_context)
649 {
650 struct st_nci_info *info = nci_get_drvdata(ndev);
651
652 pr_debug("\n");
653
654 switch (se_idx) {
655 case ST_NCI_ESE_HOST_ID:
656 info->se_info.cb = cb;
657 info->se_info.cb_context = cb_context;
658 mod_timer(&info->se_info.bwi_timer, jiffies +
659 msecs_to_jiffies(info->se_info.wt_timeout));
660 info->se_info.bwi_active = true;
661 return nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
662 ST_NCI_EVT_TRANSMIT_DATA, apdu,
663 apdu_length);
664 default:
665 return -ENODEV;
666 }
667 }
668 EXPORT_SYMBOL(st_nci_se_io);
669
st_nci_se_wt_timeout(struct timer_list * t)670 static void st_nci_se_wt_timeout(struct timer_list *t)
671 {
672 /*
673 * No answer from the secure element
674 * within the defined timeout.
675 * Let's send a reset request as recovery procedure.
676 * According to the situation, we first try to send a software reset
677 * to the secure element. If the next command is still not
678 * answering in time, we send to the CLF a secure element hardware
679 * reset request.
680 */
681 /* hardware reset managed through VCC_UICC_OUT power supply */
682 u8 param = 0x01;
683 struct st_nci_info *info = from_timer(info, t, se_info.bwi_timer);
684
685 pr_debug("\n");
686
687 info->se_info.bwi_active = false;
688
689 if (!info->se_info.xch_error) {
690 info->se_info.xch_error = true;
691 nci_hci_send_event(info->ndlc->ndev, ST_NCI_APDU_READER_GATE,
692 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
693 } else {
694 info->se_info.xch_error = false;
695 nci_hci_send_event(info->ndlc->ndev, ST_NCI_DEVICE_MGNT_GATE,
696 ST_NCI_EVT_SE_HARD_RESET, ¶m, 1);
697 }
698 info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
699 }
700
st_nci_se_activation_timeout(struct timer_list * t)701 static void st_nci_se_activation_timeout(struct timer_list *t)
702 {
703 struct st_nci_info *info = from_timer(info, t,
704 se_info.se_active_timer);
705
706 pr_debug("\n");
707
708 info->se_info.se_active = false;
709
710 complete(&info->se_info.req_completion);
711 }
712
st_nci_se_init(struct nci_dev * ndev,struct st_nci_se_status * se_status)713 int st_nci_se_init(struct nci_dev *ndev, struct st_nci_se_status *se_status)
714 {
715 struct st_nci_info *info = nci_get_drvdata(ndev);
716
717 init_completion(&info->se_info.req_completion);
718 /* initialize timers */
719 timer_setup(&info->se_info.bwi_timer, st_nci_se_wt_timeout, 0);
720 info->se_info.bwi_active = false;
721
722 timer_setup(&info->se_info.se_active_timer,
723 st_nci_se_activation_timeout, 0);
724 info->se_info.se_active = false;
725
726 info->se_info.xch_error = false;
727
728 info->se_info.wt_timeout =
729 ST_NCI_BWI_TO_TIMEOUT(ST_NCI_ATR_DEFAULT_BWI);
730
731 info->se_info.se_status = se_status;
732
733 return 0;
734 }
735 EXPORT_SYMBOL(st_nci_se_init);
736
st_nci_se_deinit(struct nci_dev * ndev)737 void st_nci_se_deinit(struct nci_dev *ndev)
738 {
739 struct st_nci_info *info = nci_get_drvdata(ndev);
740
741 if (info->se_info.bwi_active)
742 del_timer_sync(&info->se_info.bwi_timer);
743 if (info->se_info.se_active)
744 del_timer_sync(&info->se_info.se_active_timer);
745
746 info->se_info.se_active = false;
747 info->se_info.bwi_active = false;
748 }
749 EXPORT_SYMBOL(st_nci_se_deinit);
750
751
