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 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 */
st_nci_hci_connectivity_event_received(struct nci_dev * ndev,u8 host,u8 event,struct sk_buff * skb)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 u32 aid_len;
316 u8 params_len;
317
318 pr_debug("connectivity gate event: %x\n", event);
319
320 switch (event) {
321 case ST_NCI_EVT_CONNECTIVITY:
322 r = nfc_se_connectivity(ndev->nfc_dev, host);
323 break;
324 case ST_NCI_EVT_TRANSACTION:
325 /* According to specification etsi 102 622
326 * 11.2.2.4 EVT_TRANSACTION Table 52
327 * Description Tag Length
328 * AID 81 5 to 16
329 * PARAMETERS 82 0 to 255
330 *
331 * The key differences are aid storage length is variably sized
332 * in the packet, but fixed in nfc_evt_transaction, and that
333 * the aid_len is u8 in the packet, but u32 in the structure,
334 * and the tags in the packet are not included in
335 * nfc_evt_transaction.
336 *
337 * size(b): 1 1 5-16 1 1 0-255
338 * offset: 0 1 2 aid_len + 2 aid_len + 3 aid_len + 4
339 * mem name: aid_tag(M) aid_len aid params_tag(M) params_len params
340 * example: 0x81 5-16 X 0x82 0-255 X
341 */
342 if (skb->len < 2 || skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)
343 return -EPROTO;
344
345 aid_len = skb->data[1];
346
347 if (skb->len < aid_len + 4 ||
348 aid_len > sizeof(transaction->aid))
349 return -EPROTO;
350
351 params_len = skb->data[aid_len + 3];
352
353 /* Verify PARAMETERS tag is (82), and final check that there is
354 * enough space in the packet to read everything.
355 */
356 if (skb->data[aid_len + 2] != NFC_EVT_TRANSACTION_PARAMS_TAG ||
357 skb->len < aid_len + 4 + params_len)
358 return -EPROTO;
359
360 transaction = devm_kzalloc(dev, sizeof(*transaction) +
361 params_len, GFP_KERNEL);
362 if (!transaction)
363 return -ENOMEM;
364
365 transaction->aid_len = aid_len;
366 transaction->params_len = params_len;
367
368 memcpy(transaction->aid, &skb->data[2], aid_len);
369 memcpy(transaction->params, &skb->data[aid_len + 4],
370 params_len);
371
372 r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
373 break;
374 default:
375 nfc_err(&ndev->nfc_dev->dev, "Unexpected event on connectivity gate\n");
376 return 1;
377 }
378 kfree_skb(skb);
379 return r;
380 }
381
st_nci_hci_event_received(struct nci_dev * ndev,u8 pipe,u8 event,struct sk_buff * skb)382 void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
383 u8 event, struct sk_buff *skb)
384 {
385 u8 gate = ndev->hci_dev->pipes[pipe].gate;
386 u8 host = ndev->hci_dev->pipes[pipe].host;
387
388 switch (gate) {
389 case NCI_HCI_ADMIN_GATE:
390 st_nci_hci_admin_event_received(ndev, event, skb);
391 break;
392 case ST_NCI_APDU_READER_GATE:
393 st_nci_hci_apdu_reader_event_received(ndev, event, skb);
394 break;
395 case ST_NCI_CONNECTIVITY_GATE:
396 st_nci_hci_connectivity_event_received(ndev, host, event, skb);
397 break;
398 }
399 }
400 EXPORT_SYMBOL_GPL(st_nci_hci_event_received);
401
st_nci_hci_cmd_received(struct nci_dev * ndev,u8 pipe,u8 cmd,struct sk_buff * skb)402 void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
403 struct sk_buff *skb)
404 {
405 struct st_nci_info *info = nci_get_drvdata(ndev);
406 u8 gate = ndev->hci_dev->pipes[pipe].gate;
407
408 pr_debug("cmd: %x\n", cmd);
409
410 switch (cmd) {
411 case NCI_HCI_ANY_OPEN_PIPE:
412 if (gate != ST_NCI_APDU_READER_GATE &&
413 ndev->hci_dev->pipes[pipe].host != ST_NCI_UICC_HOST_ID)
414 ndev->hci_dev->count_pipes++;
415
416 if (ndev->hci_dev->count_pipes ==
417 ndev->hci_dev->expected_pipes) {
418 del_timer_sync(&info->se_info.se_active_timer);
419 info->se_info.se_active = false;
420 ndev->hci_dev->count_pipes = 0;
421 complete(&info->se_info.req_completion);
422 }
423 break;
424 }
425 }
426 EXPORT_SYMBOL_GPL(st_nci_hci_cmd_received);
427
st_nci_control_se(struct nci_dev * ndev,u8 se_idx,u8 state)428 static int st_nci_control_se(struct nci_dev *ndev, u8 se_idx,
429 u8 state)
430 {
431 struct st_nci_info *info = nci_get_drvdata(ndev);
432 int r, i;
433 struct sk_buff *sk_host_list;
434 u8 host_id;
435
436 switch (se_idx) {
437 case ST_NCI_UICC_HOST_ID:
438 ndev->hci_dev->count_pipes = 0;
439 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_UICC;
440 break;
441 case ST_NCI_ESE_HOST_ID:
442 ndev->hci_dev->count_pipes = 0;
443 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_EMBEDDED;
444 break;
445 default:
446 return -EINVAL;
447 }
448
449 /*
450 * Wait for an EVT_HOT_PLUG in order to
451 * retrieve a relevant host list.
452 */
453 reinit_completion(&info->se_info.req_completion);
454 r = nci_nfcee_mode_set(ndev, se_idx, state);
455 if (r != NCI_STATUS_OK)
456 return r;
457
458 mod_timer(&info->se_info.se_active_timer, jiffies +
459 msecs_to_jiffies(ST_NCI_SE_TO_HOT_PLUG));
460 info->se_info.se_active = true;
461
462 /* Ignore return value and check in any case the host_list */
463 wait_for_completion_interruptible(&info->se_info.req_completion);
464
465 /* There might be some "collision" after receiving a HOT_PLUG event
466 * This may cause the CLF to not answer to the next hci command.
467 * There is no possible synchronization to prevent this.
468 * Adding a small delay is the only way to solve the issue.
469 */
470 if (info->se_info.se_status->is_ese_present &&
471 info->se_info.se_status->is_uicc_present)
472 usleep_range(15000, 20000);
473
474 r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
475 NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
476 if (r != NCI_HCI_ANY_OK)
477 return r;
478
479 for (i = 0; i < sk_host_list->len &&
480 sk_host_list->data[i] != se_idx; i++)
481 ;
482 host_id = sk_host_list->data[i];
483 kfree_skb(sk_host_list);
484 if (state == ST_NCI_SE_MODE_ON && host_id == se_idx)
485 return se_idx;
486 else if (state == ST_NCI_SE_MODE_OFF && host_id != se_idx)
487 return se_idx;
488
489 return -1;
490 }
491
st_nci_disable_se(struct nci_dev * ndev,u32 se_idx)492 int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
493 {
494 int r;
495
496 /*
497 * According to upper layer, se_idx == NFC_SE_UICC when
498 * info->se_info.se_status->is_uicc_enable is true should never happen
499 * Same for eSE.
500 */
501 r = st_nci_control_se(ndev, se_idx, ST_NCI_SE_MODE_OFF);
502 if (r < 0) {
503 /* Do best effort to release SWP */
504 if (se_idx == NFC_SE_EMBEDDED) {
505 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
506 ST_NCI_EVT_SE_END_OF_APDU_TRANSFER,
507 NULL, 0);
508 }
509 return r;
510 }
511
512 return 0;
513 }
514 EXPORT_SYMBOL_GPL(st_nci_disable_se);
515
st_nci_enable_se(struct nci_dev * ndev,u32 se_idx)516 int st_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
517 {
518 int r;
519
520 /*
521 * According to upper layer, se_idx == NFC_SE_UICC when
522 * info->se_info.se_status->is_uicc_enable is true should never happen.
523 * Same for eSE.
524 */
525 r = st_nci_control_se(ndev, se_idx, ST_NCI_SE_MODE_ON);
526 if (r == ST_NCI_ESE_HOST_ID) {
527 st_nci_se_get_atr(ndev);
528 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
529 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
530 }
531
532 if (r < 0) {
533 /*
534 * The activation procedure failed, the secure element
535 * is not connected. Remove from the list.
536 */
537 nfc_remove_se(ndev->nfc_dev, se_idx);
538 return r;
539 }
540
541 return 0;
542 }
543 EXPORT_SYMBOL_GPL(st_nci_enable_se);
544
st_nci_hci_network_init(struct nci_dev * ndev)545 static int st_nci_hci_network_init(struct nci_dev *ndev)
546 {
547 struct st_nci_info *info = nci_get_drvdata(ndev);
548 struct core_conn_create_dest_spec_params *dest_params;
549 struct dest_spec_params spec_params;
550 struct nci_conn_info *conn_info;
551 int r, dev_num;
552
553 dest_params =
554 kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
555 sizeof(struct dest_spec_params), GFP_KERNEL);
556 if (dest_params == NULL)
557 return -ENOMEM;
558
559 dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
560 dest_params->length = sizeof(struct dest_spec_params);
561 spec_params.id = ndev->hci_dev->nfcee_id;
562 spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
563 memcpy(dest_params->value, &spec_params,
564 sizeof(struct dest_spec_params));
565 r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
566 sizeof(struct core_conn_create_dest_spec_params) +
567 sizeof(struct dest_spec_params),
568 dest_params);
569 if (r != NCI_STATUS_OK)
570 goto free_dest_params;
571
572 conn_info = ndev->hci_dev->conn_info;
573 if (!conn_info)
574 goto free_dest_params;
575
576 ndev->hci_dev->init_data.gate_count = ARRAY_SIZE(st_nci_gates);
577 memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
578 sizeof(st_nci_gates));
579
580 /*
581 * Session id must include the driver name + i2c bus addr
582 * persistent info to discriminate 2 identical chips
583 */
584 dev_num = find_first_zero_bit(dev_mask, ST_NCI_NUM_DEVICES);
585 if (dev_num >= ST_NCI_NUM_DEVICES) {
586 r = -ENODEV;
587 goto free_dest_params;
588 }
589
590 scnprintf(ndev->hci_dev->init_data.session_id,
591 sizeof(ndev->hci_dev->init_data.session_id),
592 "%s%2x", "ST21BH", dev_num);
593
594 r = nci_hci_dev_session_init(ndev);
595 if (r != NCI_HCI_ANY_OK)
596 goto free_dest_params;
597
598 /*
599 * In factory mode, we prevent secure elements activation
600 * by disabling nfcee on the current HCI connection id.
601 * HCI will be used here only for proprietary commands.
602 */
603 if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
604 r = nci_nfcee_mode_set(ndev,
605 ndev->hci_dev->conn_info->dest_params->id,
606 NCI_NFCEE_DISABLE);
607 else
608 r = nci_nfcee_mode_set(ndev,
609 ndev->hci_dev->conn_info->dest_params->id,
610 NCI_NFCEE_ENABLE);
611
612 free_dest_params:
613 kfree(dest_params);
614 return r;
615 }
616
st_nci_discover_se(struct nci_dev * ndev)617 int st_nci_discover_se(struct nci_dev *ndev)
618 {
619 u8 white_list[2];
620 int r, wl_size = 0;
621 int se_count = 0;
622 struct st_nci_info *info = nci_get_drvdata(ndev);
623
624 r = st_nci_hci_network_init(ndev);
625 if (r != 0)
626 return r;
627
628 if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
629 return 0;
630
631 if (info->se_info.se_status->is_uicc_present)
632 white_list[wl_size++] = ST_NCI_UICC_HOST_ID;
633 if (info->se_info.se_status->is_ese_present)
634 white_list[wl_size++] = ST_NCI_ESE_HOST_ID;
635
636 if (wl_size) {
637 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
638 NCI_HCI_ADMIN_PARAM_WHITELIST,
639 white_list, wl_size);
640 if (r != NCI_HCI_ANY_OK)
641 return r;
642 }
643
644 if (info->se_info.se_status->is_uicc_present) {
645 nfc_add_se(ndev->nfc_dev, ST_NCI_UICC_HOST_ID, NFC_SE_UICC);
646 se_count++;
647 }
648
649 if (info->se_info.se_status->is_ese_present) {
650 nfc_add_se(ndev->nfc_dev, ST_NCI_ESE_HOST_ID, NFC_SE_EMBEDDED);
651 se_count++;
652 }
653
654 return !se_count;
655 }
656 EXPORT_SYMBOL_GPL(st_nci_discover_se);
657
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)658 int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
659 u8 *apdu, size_t apdu_length,
660 se_io_cb_t cb, void *cb_context)
661 {
662 struct st_nci_info *info = nci_get_drvdata(ndev);
663
664 switch (se_idx) {
665 case ST_NCI_ESE_HOST_ID:
666 info->se_info.cb = cb;
667 info->se_info.cb_context = cb_context;
668 mod_timer(&info->se_info.bwi_timer, jiffies +
669 msecs_to_jiffies(info->se_info.wt_timeout));
670 info->se_info.bwi_active = true;
671 return nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
672 ST_NCI_EVT_TRANSMIT_DATA, apdu,
673 apdu_length);
674 default:
675 /* Need to free cb_context here as at the moment we can't
676 * clearly indicate to the caller if the callback function
677 * would be called (and free it) or not. In both cases a
678 * negative value may be returned to the caller.
679 */
680 kfree(cb_context);
681 return -ENODEV;
682 }
683 }
684 EXPORT_SYMBOL(st_nci_se_io);
685
st_nci_se_wt_timeout(struct timer_list * t)686 static void st_nci_se_wt_timeout(struct timer_list *t)
687 {
688 /*
689 * No answer from the secure element
690 * within the defined timeout.
691 * Let's send a reset request as recovery procedure.
692 * According to the situation, we first try to send a software reset
693 * to the secure element. If the next command is still not
694 * answering in time, we send to the CLF a secure element hardware
695 * reset request.
696 */
697 /* hardware reset managed through VCC_UICC_OUT power supply */
698 u8 param = 0x01;
699 struct st_nci_info *info = from_timer(info, t, se_info.bwi_timer);
700
701 info->se_info.bwi_active = false;
702
703 if (!info->se_info.xch_error) {
704 info->se_info.xch_error = true;
705 nci_hci_send_event(info->ndlc->ndev, ST_NCI_APDU_READER_GATE,
706 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
707 } else {
708 info->se_info.xch_error = false;
709 nci_hci_send_event(info->ndlc->ndev, ST_NCI_DEVICE_MGNT_GATE,
710 ST_NCI_EVT_SE_HARD_RESET, ¶m, 1);
711 }
712 info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
713 }
714
st_nci_se_activation_timeout(struct timer_list * t)715 static void st_nci_se_activation_timeout(struct timer_list *t)
716 {
717 struct st_nci_info *info = from_timer(info, t,
718 se_info.se_active_timer);
719
720 info->se_info.se_active = false;
721
722 complete(&info->se_info.req_completion);
723 }
724
st_nci_se_init(struct nci_dev * ndev,struct st_nci_se_status * se_status)725 int st_nci_se_init(struct nci_dev *ndev, struct st_nci_se_status *se_status)
726 {
727 struct st_nci_info *info = nci_get_drvdata(ndev);
728
729 init_completion(&info->se_info.req_completion);
730 /* initialize timers */
731 timer_setup(&info->se_info.bwi_timer, st_nci_se_wt_timeout, 0);
732 info->se_info.bwi_active = false;
733
734 timer_setup(&info->se_info.se_active_timer,
735 st_nci_se_activation_timeout, 0);
736 info->se_info.se_active = false;
737
738 info->se_info.xch_error = false;
739
740 info->se_info.wt_timeout =
741 ST_NCI_BWI_TO_TIMEOUT(ST_NCI_ATR_DEFAULT_BWI);
742
743 info->se_info.se_status = se_status;
744
745 return 0;
746 }
747 EXPORT_SYMBOL(st_nci_se_init);
748
st_nci_se_deinit(struct nci_dev * ndev)749 void st_nci_se_deinit(struct nci_dev *ndev)
750 {
751 struct st_nci_info *info = nci_get_drvdata(ndev);
752
753 if (info->se_info.bwi_active)
754 del_timer_sync(&info->se_info.bwi_timer);
755 if (info->se_info.se_active)
756 del_timer_sync(&info->se_info.se_active_timer);
757
758 info->se_info.se_active = false;
759 info->se_info.bwi_active = false;
760 }
761 EXPORT_SYMBOL(st_nci_se_deinit);
762
763