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 devm_kfree(dev, transaction);
345 return -EPROTO;
346 }
347
348 transaction->params_len = skb->data[transaction->aid_len + 3];
349 memcpy(transaction->params, skb->data +
350 transaction->aid_len + 4, transaction->params_len);
351
352 r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
353 break;
354 default:
355 nfc_err(&ndev->nfc_dev->dev, "Unexpected event on connectivity gate\n");
356 return 1;
357 }
358 kfree_skb(skb);
359 return r;
360 }
361
st_nci_hci_event_received(struct nci_dev * ndev,u8 pipe,u8 event,struct sk_buff * skb)362 void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
363 u8 event, struct sk_buff *skb)
364 {
365 u8 gate = ndev->hci_dev->pipes[pipe].gate;
366 u8 host = ndev->hci_dev->pipes[pipe].host;
367
368 switch (gate) {
369 case NCI_HCI_ADMIN_GATE:
370 st_nci_hci_admin_event_received(ndev, event, skb);
371 break;
372 case ST_NCI_APDU_READER_GATE:
373 st_nci_hci_apdu_reader_event_received(ndev, event, skb);
374 break;
375 case ST_NCI_CONNECTIVITY_GATE:
376 st_nci_hci_connectivity_event_received(ndev, host, event, skb);
377 break;
378 }
379 }
380 EXPORT_SYMBOL_GPL(st_nci_hci_event_received);
381
st_nci_hci_cmd_received(struct nci_dev * ndev,u8 pipe,u8 cmd,struct sk_buff * skb)382 void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
383 struct sk_buff *skb)
384 {
385 struct st_nci_info *info = nci_get_drvdata(ndev);
386 u8 gate = ndev->hci_dev->pipes[pipe].gate;
387
388 pr_debug("cmd: %x\n", cmd);
389
390 switch (cmd) {
391 case NCI_HCI_ANY_OPEN_PIPE:
392 if (gate != ST_NCI_APDU_READER_GATE &&
393 ndev->hci_dev->pipes[pipe].host != ST_NCI_UICC_HOST_ID)
394 ndev->hci_dev->count_pipes++;
395
396 if (ndev->hci_dev->count_pipes ==
397 ndev->hci_dev->expected_pipes) {
398 del_timer_sync(&info->se_info.se_active_timer);
399 info->se_info.se_active = false;
400 ndev->hci_dev->count_pipes = 0;
401 complete(&info->se_info.req_completion);
402 }
403 break;
404 }
405 }
406 EXPORT_SYMBOL_GPL(st_nci_hci_cmd_received);
407
st_nci_control_se(struct nci_dev * ndev,u8 se_idx,u8 state)408 static int st_nci_control_se(struct nci_dev *ndev, u8 se_idx,
409 u8 state)
410 {
411 struct st_nci_info *info = nci_get_drvdata(ndev);
412 int r, i;
413 struct sk_buff *sk_host_list;
414 u8 host_id;
415
416 switch (se_idx) {
417 case ST_NCI_UICC_HOST_ID:
418 ndev->hci_dev->count_pipes = 0;
419 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_UICC;
420 break;
421 case ST_NCI_ESE_HOST_ID:
422 ndev->hci_dev->count_pipes = 0;
423 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_EMBEDDED;
424 break;
425 default:
426 return -EINVAL;
427 }
428
429 /*
430 * Wait for an EVT_HOT_PLUG in order to
431 * retrieve a relevant host list.
432 */
433 reinit_completion(&info->se_info.req_completion);
434 r = nci_nfcee_mode_set(ndev, se_idx, state);
435 if (r != NCI_STATUS_OK)
436 return r;
437
438 mod_timer(&info->se_info.se_active_timer, jiffies +
439 msecs_to_jiffies(ST_NCI_SE_TO_HOT_PLUG));
440 info->se_info.se_active = true;
441
442 /* Ignore return value and check in any case the host_list */
443 wait_for_completion_interruptible(&info->se_info.req_completion);
444
445 /* There might be some "collision" after receiving a HOT_PLUG event
446 * This may cause the CLF to not answer to the next hci command.
447 * There is no possible synchronization to prevent this.
448 * Adding a small delay is the only way to solve the issue.
449 */
450 if (info->se_info.se_status->is_ese_present &&
451 info->se_info.se_status->is_uicc_present)
452 usleep_range(15000, 20000);
453
454 r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
455 NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
456 if (r != NCI_HCI_ANY_OK)
457 return r;
458
459 for (i = 0; i < sk_host_list->len &&
460 sk_host_list->data[i] != se_idx; i++)
461 ;
462 host_id = sk_host_list->data[i];
463 kfree_skb(sk_host_list);
464 if (state == ST_NCI_SE_MODE_ON && host_id == se_idx)
465 return se_idx;
466 else if (state == ST_NCI_SE_MODE_OFF && host_id != se_idx)
467 return se_idx;
468
469 return -1;
470 }
471
st_nci_disable_se(struct nci_dev * ndev,u32 se_idx)472 int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
473 {
474 int r;
475
476 pr_debug("st_nci_disable_se\n");
477
478 /*
479 * According to upper layer, se_idx == NFC_SE_UICC when
480 * info->se_info.se_status->is_uicc_enable is true should never happen
481 * Same for eSE.
482 */
483 r = st_nci_control_se(ndev, se_idx, ST_NCI_SE_MODE_OFF);
484 if (r < 0) {
485 /* Do best effort to release SWP */
486 if (se_idx == NFC_SE_EMBEDDED) {
487 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
488 ST_NCI_EVT_SE_END_OF_APDU_TRANSFER,
489 NULL, 0);
490 }
491 return r;
492 }
493
494 return 0;
495 }
496 EXPORT_SYMBOL_GPL(st_nci_disable_se);
497
st_nci_enable_se(struct nci_dev * ndev,u32 se_idx)498 int st_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
499 {
500 int r;
501
502 pr_debug("st_nci_enable_se\n");
503
504 /*
505 * According to upper layer, se_idx == NFC_SE_UICC when
506 * info->se_info.se_status->is_uicc_enable is true should never happen.
507 * Same for eSE.
508 */
509 r = st_nci_control_se(ndev, se_idx, ST_NCI_SE_MODE_ON);
510 if (r == ST_NCI_ESE_HOST_ID) {
511 st_nci_se_get_atr(ndev);
512 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
513 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
514 }
515
516 if (r < 0) {
517 /*
518 * The activation procedure failed, the secure element
519 * is not connected. Remove from the list.
520 */
521 nfc_remove_se(ndev->nfc_dev, se_idx);
522 return r;
523 }
524
525 return 0;
526 }
527 EXPORT_SYMBOL_GPL(st_nci_enable_se);
528
st_nci_hci_network_init(struct nci_dev * ndev)529 static int st_nci_hci_network_init(struct nci_dev *ndev)
530 {
531 struct st_nci_info *info = nci_get_drvdata(ndev);
532 struct core_conn_create_dest_spec_params *dest_params;
533 struct dest_spec_params spec_params;
534 struct nci_conn_info *conn_info;
535 int r, dev_num;
536
537 dest_params =
538 kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
539 sizeof(struct dest_spec_params), GFP_KERNEL);
540 if (dest_params == NULL) {
541 r = -ENOMEM;
542 goto exit;
543 }
544
545 dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
546 dest_params->length = sizeof(struct dest_spec_params);
547 spec_params.id = ndev->hci_dev->nfcee_id;
548 spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
549 memcpy(dest_params->value, &spec_params,
550 sizeof(struct dest_spec_params));
551 r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
552 sizeof(struct core_conn_create_dest_spec_params) +
553 sizeof(struct dest_spec_params),
554 dest_params);
555 if (r != NCI_STATUS_OK)
556 goto free_dest_params;
557
558 conn_info = ndev->hci_dev->conn_info;
559 if (!conn_info)
560 goto free_dest_params;
561
562 ndev->hci_dev->init_data.gate_count = ARRAY_SIZE(st_nci_gates);
563 memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
564 sizeof(st_nci_gates));
565
566 /*
567 * Session id must include the driver name + i2c bus addr
568 * persistent info to discriminate 2 identical chips
569 */
570 dev_num = find_first_zero_bit(dev_mask, ST_NCI_NUM_DEVICES);
571 if (dev_num >= ST_NCI_NUM_DEVICES) {
572 r = -ENODEV;
573 goto free_dest_params;
574 }
575
576 scnprintf(ndev->hci_dev->init_data.session_id,
577 sizeof(ndev->hci_dev->init_data.session_id),
578 "%s%2x", "ST21BH", dev_num);
579
580 r = nci_hci_dev_session_init(ndev);
581 if (r != NCI_HCI_ANY_OK)
582 goto free_dest_params;
583
584 /*
585 * In factory mode, we prevent secure elements activation
586 * by disabling nfcee on the current HCI connection id.
587 * HCI will be used here only for proprietary commands.
588 */
589 if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
590 r = nci_nfcee_mode_set(ndev,
591 ndev->hci_dev->conn_info->dest_params->id,
592 NCI_NFCEE_DISABLE);
593 else
594 r = nci_nfcee_mode_set(ndev,
595 ndev->hci_dev->conn_info->dest_params->id,
596 NCI_NFCEE_ENABLE);
597
598 free_dest_params:
599 kfree(dest_params);
600
601 exit:
602 return r;
603 }
604
st_nci_discover_se(struct nci_dev * ndev)605 int st_nci_discover_se(struct nci_dev *ndev)
606 {
607 u8 white_list[2];
608 int r, wl_size = 0;
609 int se_count = 0;
610 struct st_nci_info *info = nci_get_drvdata(ndev);
611
612 pr_debug("st_nci_discover_se\n");
613
614 r = st_nci_hci_network_init(ndev);
615 if (r != 0)
616 return r;
617
618 if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
619 return 0;
620
621 if (info->se_info.se_status->is_uicc_present)
622 white_list[wl_size++] = ST_NCI_UICC_HOST_ID;
623 if (info->se_info.se_status->is_ese_present)
624 white_list[wl_size++] = ST_NCI_ESE_HOST_ID;
625
626 if (wl_size) {
627 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
628 NCI_HCI_ADMIN_PARAM_WHITELIST,
629 white_list, wl_size);
630 if (r != NCI_HCI_ANY_OK)
631 return r;
632 }
633
634 if (info->se_info.se_status->is_uicc_present) {
635 nfc_add_se(ndev->nfc_dev, ST_NCI_UICC_HOST_ID, NFC_SE_UICC);
636 se_count++;
637 }
638
639 if (info->se_info.se_status->is_ese_present) {
640 nfc_add_se(ndev->nfc_dev, ST_NCI_ESE_HOST_ID, NFC_SE_EMBEDDED);
641 se_count++;
642 }
643
644 return !se_count;
645 }
646 EXPORT_SYMBOL_GPL(st_nci_discover_se);
647
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)648 int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
649 u8 *apdu, size_t apdu_length,
650 se_io_cb_t cb, void *cb_context)
651 {
652 struct st_nci_info *info = nci_get_drvdata(ndev);
653
654 pr_debug("\n");
655
656 switch (se_idx) {
657 case ST_NCI_ESE_HOST_ID:
658 info->se_info.cb = cb;
659 info->se_info.cb_context = cb_context;
660 mod_timer(&info->se_info.bwi_timer, jiffies +
661 msecs_to_jiffies(info->se_info.wt_timeout));
662 info->se_info.bwi_active = true;
663 return nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
664 ST_NCI_EVT_TRANSMIT_DATA, apdu,
665 apdu_length);
666 default:
667 /* Need to free cb_context here as at the moment we can't
668 * clearly indicate to the caller if the callback function
669 * would be called (and free it) or not. In both cases a
670 * negative value may be returned to the caller.
671 */
672 kfree(cb_context);
673 return -ENODEV;
674 }
675 }
676 EXPORT_SYMBOL(st_nci_se_io);
677
st_nci_se_wt_timeout(struct timer_list * t)678 static void st_nci_se_wt_timeout(struct timer_list *t)
679 {
680 /*
681 * No answer from the secure element
682 * within the defined timeout.
683 * Let's send a reset request as recovery procedure.
684 * According to the situation, we first try to send a software reset
685 * to the secure element. If the next command is still not
686 * answering in time, we send to the CLF a secure element hardware
687 * reset request.
688 */
689 /* hardware reset managed through VCC_UICC_OUT power supply */
690 u8 param = 0x01;
691 struct st_nci_info *info = from_timer(info, t, se_info.bwi_timer);
692
693 pr_debug("\n");
694
695 info->se_info.bwi_active = false;
696
697 if (!info->se_info.xch_error) {
698 info->se_info.xch_error = true;
699 nci_hci_send_event(info->ndlc->ndev, ST_NCI_APDU_READER_GATE,
700 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
701 } else {
702 info->se_info.xch_error = false;
703 nci_hci_send_event(info->ndlc->ndev, ST_NCI_DEVICE_MGNT_GATE,
704 ST_NCI_EVT_SE_HARD_RESET, ¶m, 1);
705 }
706 info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
707 }
708
st_nci_se_activation_timeout(struct timer_list * t)709 static void st_nci_se_activation_timeout(struct timer_list *t)
710 {
711 struct st_nci_info *info = from_timer(info, t,
712 se_info.se_active_timer);
713
714 pr_debug("\n");
715
716 info->se_info.se_active = false;
717
718 complete(&info->se_info.req_completion);
719 }
720
st_nci_se_init(struct nci_dev * ndev,struct st_nci_se_status * se_status)721 int st_nci_se_init(struct nci_dev *ndev, struct st_nci_se_status *se_status)
722 {
723 struct st_nci_info *info = nci_get_drvdata(ndev);
724
725 init_completion(&info->se_info.req_completion);
726 /* initialize timers */
727 timer_setup(&info->se_info.bwi_timer, st_nci_se_wt_timeout, 0);
728 info->se_info.bwi_active = false;
729
730 timer_setup(&info->se_info.se_active_timer,
731 st_nci_se_activation_timeout, 0);
732 info->se_info.se_active = false;
733
734 info->se_info.xch_error = false;
735
736 info->se_info.wt_timeout =
737 ST_NCI_BWI_TO_TIMEOUT(ST_NCI_ATR_DEFAULT_BWI);
738
739 info->se_info.se_status = se_status;
740
741 return 0;
742 }
743 EXPORT_SYMBOL(st_nci_se_init);
744
st_nci_se_deinit(struct nci_dev * ndev)745 void st_nci_se_deinit(struct nci_dev *ndev)
746 {
747 struct st_nci_info *info = nci_get_drvdata(ndev);
748
749 if (info->se_info.bwi_active)
750 del_timer_sync(&info->se_info.bwi_timer);
751 if (info->se_info.se_active)
752 del_timer_sync(&info->se_info.se_active_timer);
753
754 info->se_info.se_active = false;
755 info->se_info.bwi_active = false;
756 }
757 EXPORT_SYMBOL(st_nci_se_deinit);
758
759