drivers/nfc/st-nci/se.c

   1 /*
   2  * Secure Element driver for STMicroelectronics NFC NCI chip
   3  *
   4  * Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/nfc.h>
  21 #include <linux/delay.h>
  22 #include <net/nfc/nci.h>
  23 #include <net/nfc/nci_core.h>
  24
  25 #include "st-nci.h"
  26
  27 struct st_nci_pipe_info {
  28         u8 pipe_state;
  29         u8 src_host_id;
  30         u8 src_gate_id;
  31         u8 dst_host_id;
  32         u8 dst_gate_id;
  33 } __packed;
  34
  35 /* Hosts */
  36 #define ST_NCI_HOST_CONTROLLER_ID     0x00
  37 #define ST_NCI_TERMINAL_HOST_ID       0x01
  38 #define ST_NCI_UICC_HOST_ID           0x02
  39 #define ST_NCI_ESE_HOST_ID            0xc0
  40
  41 /* Gates */
  42 #define ST_NCI_DEVICE_MGNT_GATE       0x01
  43 #define ST_NCI_APDU_READER_GATE       0xf0
  44 #define ST_NCI_CONNECTIVITY_GATE      0x41
  45
  46 /* Pipes */
  47 #define ST_NCI_DEVICE_MGNT_PIPE               0x02
  48
  49 /* Connectivity pipe only */
  50 #define ST_NCI_SE_COUNT_PIPE_UICC             0x01
  51 /* Connectivity + APDU Reader pipe */
  52 #define ST_NCI_SE_COUNT_PIPE_EMBEDDED         0x02
  53
  54 #define ST_NCI_SE_TO_HOT_PLUG                   1000 /* msecs */
  55 #define ST_NCI_SE_TO_PIPES                      2000
  56
  57 #define ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(x)   (x->data[0] & 0x80)
  58
  59 #define NCI_HCI_APDU_PARAM_ATR                     0x01
  60 #define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY       0x01
  61 #define NCI_HCI_ADMIN_PARAM_WHITELIST              0x03
  62 #define NCI_HCI_ADMIN_PARAM_HOST_LIST              0x04
  63
  64 #define ST_NCI_EVT_SE_HARD_RESET                0x20
  65 #define ST_NCI_EVT_TRANSMIT_DATA                0x10
  66 #define ST_NCI_EVT_WTX_REQUEST          0x11
  67 #define ST_NCI_EVT_SE_SOFT_RESET                0x11
  68 #define ST_NCI_EVT_SE_END_OF_APDU_TRANSFER      0x21
  69 #define ST_NCI_EVT_HOT_PLUG                     0x03
  70
  71 #define ST_NCI_SE_MODE_OFF                    0x00
  72 #define ST_NCI_SE_MODE_ON                     0x01
  73
  74 #define ST_NCI_EVT_CONNECTIVITY       0x10
  75 #define ST_NCI_EVT_TRANSACTION        0x12
  76
  77 #define ST_NCI_DM_GETINFO             0x13
  78 #define ST_NCI_DM_GETINFO_PIPE_LIST   0x02
  79 #define ST_NCI_DM_GETINFO_PIPE_INFO   0x01
  80 #define ST_NCI_DM_PIPE_CREATED        0x02
  81 #define ST_NCI_DM_PIPE_OPEN           0x04
  82 #define ST_NCI_DM_RF_ACTIVE           0x80
  83 #define ST_NCI_DM_DISCONNECT          0x30
  84
  85 #define ST_NCI_DM_IS_PIPE_OPEN(p) \
  86         ((p & 0x0f) == (ST_NCI_DM_PIPE_CREATED | ST_NCI_DM_PIPE_OPEN))
  87
  88 #define ST_NCI_ATR_DEFAULT_BWI        0x04
  89
  90 /*
  91  * WT = 2^BWI/10[s], convert into msecs and add a secure
  92  * room by increasing by 2 this timeout
  93  */
  94 #define ST_NCI_BWI_TO_TIMEOUT(x)      ((1 << x) * 200)
  95 #define ST_NCI_ATR_GET_Y_FROM_TD(x)   (x >> 4)
  96
  97 /* If TA is present bit 0 is set */
  98 #define ST_NCI_ATR_TA_PRESENT(x) (x & 0x01)
  99 /* If TB is present bit 1 is set */
 100 #define ST_NCI_ATR_TB_PRESENT(x) (x & 0x02)
 101
 102 #define ST_NCI_NUM_DEVICES           256
 103
 104 static DECLARE_BITMAP(dev_mask, ST_NCI_NUM_DEVICES);
 105
 106 /* Here are the mandatory pipe for st_nci */
 107 static struct nci_hci_gate st_nci_gates[] = {
 108         {NCI_HCI_ADMIN_GATE, NCI_HCI_ADMIN_PIPE,
 109                                         ST_NCI_HOST_CONTROLLER_ID},
 110         {NCI_HCI_LINK_MGMT_GATE, NCI_HCI_LINK_MGMT_PIPE,
 111                                         ST_NCI_HOST_CONTROLLER_ID},
 112         {ST_NCI_DEVICE_MGNT_GATE, ST_NCI_DEVICE_MGNT_PIPE,
 113                                         ST_NCI_HOST_CONTROLLER_ID},
 114
 115         {NCI_HCI_IDENTITY_MGMT_GATE, NCI_HCI_INVALID_PIPE,
 116                                         ST_NCI_HOST_CONTROLLER_ID},
 117
 118         /* Secure element pipes are created by secure element host */
 119         {ST_NCI_CONNECTIVITY_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
 120                                         ST_NCI_HOST_CONTROLLER_ID},
 121         {ST_NCI_APDU_READER_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
 122                                         ST_NCI_HOST_CONTROLLER_ID},
 123 };
 124
 125 static u8 st_nci_se_get_bwi(struct nci_dev *ndev)
 126 {
 127         int i;
 128         u8 td;
 129         struct st_nci_info *info = nci_get_drvdata(ndev);
 130
 131         /* Bits 8 to 5 of the first TB for T=1 encode BWI from zero to nine */
 132         for (i = 1; i < ST_NCI_ESE_MAX_LENGTH; i++) {
 133                 td = ST_NCI_ATR_GET_Y_FROM_TD(info->se_info.atr[i]);
 134                 if (ST_NCI_ATR_TA_PRESENT(td))
 135                         i++;
 136                 if (ST_NCI_ATR_TB_PRESENT(td)) {
 137                         i++;
 138                         return info->se_info.atr[i] >> 4;
 139                 }
 140         }
 141         return ST_NCI_ATR_DEFAULT_BWI;
 142 }
 143
 144 static void st_nci_se_get_atr(struct nci_dev *ndev)
 145 {
 146         struct st_nci_info *info = nci_get_drvdata(ndev);
 147         int r;
 148         struct sk_buff *skb;
 149
 150         r = nci_hci_get_param(ndev, ST_NCI_APDU_READER_GATE,
 151                                 NCI_HCI_APDU_PARAM_ATR, &skb);
 152         if (r < 0)
 153                 return;
 154
 155         if (skb->len <= ST_NCI_ESE_MAX_LENGTH) {
 156                 memcpy(info->se_info.atr, skb->data, skb->len);
 157
 158                 info->se_info.wt_timeout =
 159                         ST_NCI_BWI_TO_TIMEOUT(st_nci_se_get_bwi(ndev));
 160         }
 161         kfree_skb(skb);
 162 }
 163
 164 int st_nci_hci_load_session(struct nci_dev *ndev)
 165 {
 166         int i, j, r;
 167         struct sk_buff *skb_pipe_list, *skb_pipe_info;
 168         struct st_nci_pipe_info *dm_pipe_info;
 169         u8 pipe_list[] = { ST_NCI_DM_GETINFO_PIPE_LIST,
 170                         ST_NCI_TERMINAL_HOST_ID};
 171         u8 pipe_info[] = { ST_NCI_DM_GETINFO_PIPE_INFO,
 172                         ST_NCI_TERMINAL_HOST_ID, 0};
 173
 174         /* On ST_NCI device pipes number are dynamics
 175          * If pipes are already created, hci_dev_up will fail.
 176          * Doing a clear all pipe is a bad idea because:
 177          * - It does useless EEPROM cycling
 178          * - It might cause issue for secure elements support
 179          * (such as removing connectivity or APDU reader pipe)
 180          * A better approach on ST_NCI is to:
 181          * - get a pipe list for each host.
 182          * (eg: ST_NCI_HOST_CONTROLLER_ID for now).
 183          * (TODO Later on UICC HOST and eSE HOST)
 184          * - get pipe information
 185          * - match retrieved pipe list in st_nci_gates
 186          * ST_NCI_DEVICE_MGNT_GATE is a proprietary gate
 187          * with ST_NCI_DEVICE_MGNT_PIPE.
 188          * Pipe can be closed and need to be open.
 189          */
 190         r = nci_hci_connect_gate(ndev, ST_NCI_HOST_CONTROLLER_ID,
 191                                 ST_NCI_DEVICE_MGNT_GATE,
 192                                 ST_NCI_DEVICE_MGNT_PIPE);
 193         if (r < 0)
 194                 return r;
 195
 196         /* Get pipe list */
 197         r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
 198                         ST_NCI_DM_GETINFO, pipe_list, sizeof(pipe_list),
 199                         &skb_pipe_list);
 200         if (r < 0)
 201                 return r;
 202
 203         /* Complete the existing gate_pipe table */
 204         for (i = 0; i < skb_pipe_list->len; i++) {
 205                 pipe_info[2] = skb_pipe_list->data[i];
 206                 r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
 207                                         ST_NCI_DM_GETINFO, pipe_info,
 208                                         sizeof(pipe_info), &skb_pipe_info);
 209
 210                 if (r)
 211                         continue;
 212
 213                 /*
 214                  * Match pipe ID and gate ID
 215                  * Output format from ST21NFC_DM_GETINFO is:
 216                  * - pipe state (1byte)
 217                  * - source hid (1byte)
 218                  * - source gid (1byte)
 219                  * - destination hid (1byte)
 220                  * - destination gid (1byte)
 221                  */
 222                 dm_pipe_info = (struct st_nci_pipe_info *)skb_pipe_info->data;
 223                 if (dm_pipe_info->dst_gate_id == ST_NCI_APDU_READER_GATE &&
 224                     dm_pipe_info->src_host_id != ST_NCI_ESE_HOST_ID) {
 225                         pr_err("Unexpected apdu_reader pipe on host %x\n",
 226                                dm_pipe_info->src_host_id);
 227                         kfree_skb(skb_pipe_info);
 228                         continue;
 229                 }
 230
 231                 for (j = 3; (j < ARRAY_SIZE(st_nci_gates)) &&
 232                      (st_nci_gates[j].gate != dm_pipe_info->dst_gate_id); j++)
 233                         ;
 234
 235                 if (j < ARRAY_SIZE(st_nci_gates) &&
 236                     st_nci_gates[j].gate == dm_pipe_info->dst_gate_id &&
 237                     ST_NCI_DM_IS_PIPE_OPEN(dm_pipe_info->pipe_state)) {
 238                         ndev->hci_dev->init_data.gates[j].pipe = pipe_info[2];
 239
 240                         ndev->hci_dev->gate2pipe[st_nci_gates[j].gate] =
 241                                                 pipe_info[2];
 242                         ndev->hci_dev->pipes[pipe_info[2]].gate =
 243                                                 st_nci_gates[j].gate;
 244                         ndev->hci_dev->pipes[pipe_info[2]].host =
 245                                                 dm_pipe_info->src_host_id;
 246                 }
 247                 kfree_skb(skb_pipe_info);
 248         }
 249
 250         /*
 251          * 3 gates have a well known pipe ID. Only NCI_HCI_LINK_MGMT_GATE
 252          * is not yet open at this stage.
 253          */
 254         r = nci_hci_connect_gate(ndev, ST_NCI_HOST_CONTROLLER_ID,
 255                                  NCI_HCI_LINK_MGMT_GATE,
 256                                  NCI_HCI_LINK_MGMT_PIPE);
 257
 258         kfree_skb(skb_pipe_list);
 259         return r;
 260 }
 261 EXPORT_SYMBOL_GPL(st_nci_hci_load_session);
 262
 263 static void st_nci_hci_admin_event_received(struct nci_dev *ndev,
 264                                               u8 event, struct sk_buff *skb)
 265 {
 266         struct st_nci_info *info = nci_get_drvdata(ndev);
 267
 268         switch (event) {
 269         case ST_NCI_EVT_HOT_PLUG:
 270                 if (info->se_info.se_active) {
 271                         if (!ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
 272                                 del_timer_sync(&info->se_info.se_active_timer);
 273                                 info->se_info.se_active = false;
 274                                 complete(&info->se_info.req_completion);
 275                         } else {
 276                                 mod_timer(&info->se_info.se_active_timer,
 277                                       jiffies +
 278                                       msecs_to_jiffies(ST_NCI_SE_TO_PIPES));
 279                         }
 280                 }
 281         break;
 282         }
 283 }
 284
 285 static int st_nci_hci_apdu_reader_event_received(struct nci_dev *ndev,
 286                                                    u8 event,
 287                                                    struct sk_buff *skb)
 288 {
 289         int r = 0;
 290         struct st_nci_info *info = nci_get_drvdata(ndev);
 291
 292         pr_debug("apdu reader gate event: %x\n", event);
 293
 294         switch (event) {
 295         case ST_NCI_EVT_TRANSMIT_DATA:
 296                 del_timer_sync(&info->se_info.bwi_timer);
 297                 info->se_info.bwi_active = false;
 298                 info->se_info.cb(info->se_info.cb_context,
 299                                  skb->data, skb->len, 0);
 300         break;
 301         case ST_NCI_EVT_WTX_REQUEST:
 302                 mod_timer(&info->se_info.bwi_timer, jiffies +
 303                           msecs_to_jiffies(info->se_info.wt_timeout));
 304         break;
 305         }
 306
 307         kfree_skb(skb);
 308         return r;
 309 }
 310
 311 /*
 312  * Returns:
 313  * <= 0: driver handled the event, skb consumed
 314  *    1: driver does not handle the event, please do standard processing
 315  */
 316 static int st_nci_hci_connectivity_event_received(struct nci_dev *ndev,
 317                                                 u8 host, u8 event,
 318                                                 struct sk_buff *skb)
 319 {
 320         int r = 0;
 321         struct device *dev = &ndev->nfc_dev->dev;
 322         struct nfc_evt_transaction *transaction;
 323
 324         pr_debug("connectivity gate event: %x\n", event);
 325
 326         switch (event) {
 327         case ST_NCI_EVT_CONNECTIVITY:
 328
 329         break;
 330         case ST_NCI_EVT_TRANSACTION:
 331                 /* According to specification etsi 102 622
 332                  * 11.2.2.4 EVT_TRANSACTION Table 52
 333                  * Description  Tag     Length
 334                  * AID          81      5 to 16
 335                  * PARAMETERS   82      0 to 255
 336                  */
 337                 if (skb->len < NFC_MIN_AID_LENGTH + 2 &&
 338                     skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)
 339                         return -EPROTO;
 340
 341                 transaction = (struct nfc_evt_transaction *)devm_kzalloc(dev,
 342                                             skb->len - 2, GFP_KERNEL);
 343
 344                 transaction->aid_len = skb->data[1];
 345                 memcpy(transaction->aid, &skb->data[2], transaction->aid_len);
 346
 347                 /* Check next byte is PARAMETERS tag (82) */
 348                 if (skb->data[transaction->aid_len + 2] !=
 349                     NFC_EVT_TRANSACTION_PARAMS_TAG)
 350                         return -EPROTO;
 351
 352                 transaction->params_len = skb->data[transaction->aid_len + 3];
 353                 memcpy(transaction->params, skb->data +
 354                        transaction->aid_len + 4, transaction->params_len);
 355
 356                 r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
 357                 break;
 358         default:
 359                 return 1;
 360         }
 361         kfree_skb(skb);
 362         return r;
 363 }
 364
 365 void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
 366                                  u8 event, struct sk_buff *skb)
 367 {
 368         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 369         u8 host = ndev->hci_dev->pipes[pipe].host;
 370
 371         switch (gate) {
 372         case NCI_HCI_ADMIN_GATE:
 373                 st_nci_hci_admin_event_received(ndev, event, skb);
 374         break;
 375         case ST_NCI_APDU_READER_GATE:
 376                 st_nci_hci_apdu_reader_event_received(ndev, event, skb);
 377         break;
 378         case ST_NCI_CONNECTIVITY_GATE:
 379                 st_nci_hci_connectivity_event_received(ndev, host, event,
 380                                                          skb);
 381         break;
 382         }
 383 }
 384 EXPORT_SYMBOL_GPL(st_nci_hci_event_received);
 385
 386
 387 void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
 388                                struct sk_buff *skb)
 389 {
 390         struct st_nci_info *info = nci_get_drvdata(ndev);
 391         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 392
 393         pr_debug("cmd: %x\n", cmd);
 394
 395         switch (cmd) {
 396         case NCI_HCI_ANY_OPEN_PIPE:
 397                 if (gate != ST_NCI_APDU_READER_GATE &&
 398                     ndev->hci_dev->pipes[pipe].host != ST_NCI_UICC_HOST_ID)
 399                         ndev->hci_dev->count_pipes++;
 400
 401                 if (ndev->hci_dev->count_pipes ==
 402                     ndev->hci_dev->expected_pipes) {
 403                         del_timer_sync(&info->se_info.se_active_timer);
 404                         info->se_info.se_active = false;
 405                         ndev->hci_dev->count_pipes = 0;
 406                         complete(&info->se_info.req_completion);
 407                 }
 408         break;
 409         }
 410 }
 411 EXPORT_SYMBOL_GPL(st_nci_hci_cmd_received);
 412
 413 /*
 414  * Remarks: On some early st_nci firmware, nci_nfcee_mode_set(0)
 415  * is rejected
 416  */
 417 static int st_nci_control_se(struct nci_dev *ndev, u8 se_idx,
 418                                    u8 state)
 419 {
 420         struct st_nci_info *info = nci_get_drvdata(ndev);
 421         int r;
 422         struct sk_buff *sk_host_list;
 423         u8 host_id;
 424
 425         switch (se_idx) {
 426         case ST_NCI_UICC_HOST_ID:
 427                 ndev->hci_dev->count_pipes = 0;
 428                 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_UICC;
 429                 break;
 430         case ST_NCI_ESE_HOST_ID:
 431                 ndev->hci_dev->count_pipes = 0;
 432                 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_EMBEDDED;
 433                 break;
 434         default:
 435                 return -EINVAL;
 436         }
 437
 438         /*
 439          * Wait for an EVT_HOT_PLUG in order to
 440          * retrieve a relevant host list.
 441          */
 442         reinit_completion(&info->se_info.req_completion);
 443         r = nci_nfcee_mode_set(ndev, se_idx, NCI_NFCEE_ENABLE);
 444         if (r != NCI_STATUS_OK)
 445                 return r;
 446
 447         mod_timer(&info->se_info.se_active_timer, jiffies +
 448                 msecs_to_jiffies(ST_NCI_SE_TO_HOT_PLUG));
 449         info->se_info.se_active = true;
 450
 451         /* Ignore return value and check in any case the host_list */
 452         wait_for_completion_interruptible(&info->se_info.req_completion);
 453
 454         /* There might be some "collision" after receiving a HOT_PLUG event
 455          * This may cause the CLF to not answer to the next hci command.
 456          * There is no possible synchronization to prevent this.
 457          * Adding a small delay is the only way to solve the issue.
 458          */
 459         usleep_range(3000, 5000);
 460
 461         r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 462                         NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
 463         if (r != NCI_HCI_ANY_OK)
 464                 return r;
 465
 466         host_id = sk_host_list->data[sk_host_list->len - 1];
 467         kfree_skb(sk_host_list);
 468         if (state == ST_NCI_SE_MODE_ON && host_id == se_idx)
 469                 return se_idx;
 470         else if (state == ST_NCI_SE_MODE_OFF && host_id != se_idx)
 471                 return se_idx;
 472
 473         return -1;
 474 }
 475
 476 int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
 477 {
 478         int r;
 479
 480         pr_debug("st_nci_disable_se\n");
 481
 482         if (se_idx == NFC_SE_EMBEDDED) {
 483                 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 484                                 ST_NCI_EVT_SE_END_OF_APDU_TRANSFER, NULL, 0);
 485                 if (r < 0)
 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         pr_debug("st_nci_enable_se\n");
 498
 499         if (se_idx == ST_NCI_HCI_HOST_ID_ESE) {
 500                 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 501                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 502                 if (r < 0)
 503                         return r;
 504         }
 505
 506         return 0;
 507 }
 508 EXPORT_SYMBOL_GPL(st_nci_enable_se);
 509
 510 static int st_nci_hci_network_init(struct nci_dev *ndev)
 511 {
 512         struct core_conn_create_dest_spec_params *dest_params;
 513         struct dest_spec_params spec_params;
 514         struct nci_conn_info    *conn_info;
 515         int r, dev_num;
 516
 517         dest_params =
 518                 kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
 519                         sizeof(struct dest_spec_params), GFP_KERNEL);
 520         if (dest_params == NULL) {
 521                 r = -ENOMEM;
 522                 goto exit;
 523         }
 524
 525         dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
 526         dest_params->length = sizeof(struct dest_spec_params);
 527         spec_params.id = ndev->hci_dev->nfcee_id;
 528         spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
 529         memcpy(dest_params->value, &spec_params,
 530                sizeof(struct dest_spec_params));
 531         r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
 532                                  sizeof(struct core_conn_create_dest_spec_params) +
 533                                  sizeof(struct dest_spec_params),
 534                                  dest_params);
 535         if (r != NCI_STATUS_OK)
 536                 goto free_dest_params;
 537
 538         conn_info = ndev->hci_dev->conn_info;
 539         if (!conn_info)
 540                 goto free_dest_params;
 541
 542         ndev->hci_dev->init_data.gate_count = ARRAY_SIZE(st_nci_gates);
 543         memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
 544                sizeof(st_nci_gates));
 545
 546         /*
 547          * Session id must include the driver name + i2c bus addr
 548          * persistent info to discriminate 2 identical chips
 549          */
 550         dev_num = find_first_zero_bit(dev_mask, ST_NCI_NUM_DEVICES);
 551         if (dev_num >= ST_NCI_NUM_DEVICES) {
 552                 r = -ENODEV;
 553                 goto free_dest_params;
 554         }
 555
 556         scnprintf(ndev->hci_dev->init_data.session_id,
 557                   sizeof(ndev->hci_dev->init_data.session_id),
 558                   "%s%2x", "ST21BH", dev_num);
 559
 560         r = nci_hci_dev_session_init(ndev);
 561         if (r != NCI_HCI_ANY_OK)
 562                 goto free_dest_params;
 563
 564         r = nci_nfcee_mode_set(ndev, ndev->hci_dev->conn_info->id,
 565                                NCI_NFCEE_ENABLE);
 566         if (r != NCI_STATUS_OK)
 567                 goto free_dest_params;
 568
 569 free_dest_params:
 570         kfree(dest_params);
 571
 572 exit:
 573         return r;
 574 }
 575
 576 int st_nci_discover_se(struct nci_dev *ndev)
 577 {
 578         u8 param[2];
 579         int r;
 580         int se_count = 0;
 581
 582         pr_debug("st_nci_discover_se\n");
 583
 584         r = st_nci_hci_network_init(ndev);
 585         if (r != 0)
 586                 return r;
 587
 588         param[0] = ST_NCI_UICC_HOST_ID;
 589         param[1] = ST_NCI_HCI_HOST_ID_ESE;
 590         r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 591                                 NCI_HCI_ADMIN_PARAM_WHITELIST,
 592                                 param, sizeof(param));
 593         if (r != NCI_HCI_ANY_OK)
 594                 return r;
 595
 596         r = st_nci_control_se(ndev, ST_NCI_UICC_HOST_ID,
 597                                 ST_NCI_SE_MODE_ON);
 598         if (r == ST_NCI_UICC_HOST_ID) {
 599                 nfc_add_se(ndev->nfc_dev, ST_NCI_UICC_HOST_ID, NFC_SE_UICC);
 600                 se_count++;
 601         }
 602
 603         /* Try to enable eSE in order to check availability */
 604         r = st_nci_control_se(ndev, ST_NCI_HCI_HOST_ID_ESE,
 605                                 ST_NCI_SE_MODE_ON);
 606         if (r == ST_NCI_HCI_HOST_ID_ESE) {
 607                 nfc_add_se(ndev->nfc_dev, ST_NCI_HCI_HOST_ID_ESE,
 608                            NFC_SE_EMBEDDED);
 609                 se_count++;
 610                 st_nci_se_get_atr(ndev);
 611         }
 612
 613         return !se_count;
 614 }
 615 EXPORT_SYMBOL_GPL(st_nci_discover_se);
 616
 617 int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
 618                        u8 *apdu, size_t apdu_length,
 619                        se_io_cb_t cb, void *cb_context)
 620 {
 621         struct st_nci_info *info = nci_get_drvdata(ndev);
 622
 623         pr_debug("\n");
 624
 625         switch (se_idx) {
 626         case ST_NCI_HCI_HOST_ID_ESE:
 627                 info->se_info.cb = cb;
 628                 info->se_info.cb_context = cb_context;
 629                 mod_timer(&info->se_info.bwi_timer, jiffies +
 630                           msecs_to_jiffies(info->se_info.wt_timeout));
 631                 info->se_info.bwi_active = true;
 632                 return nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 633                                         ST_NCI_EVT_TRANSMIT_DATA, apdu,
 634                                         apdu_length);
 635         default:
 636                 return -ENODEV;
 637         }
 638 }
 639 EXPORT_SYMBOL(st_nci_se_io);
 640
 641 static void st_nci_se_wt_timeout(unsigned long data)
 642 {
 643         /*
 644          * No answer from the secure element
 645          * within the defined timeout.
 646          * Let's send a reset request as recovery procedure.
 647          * According to the situation, we first try to send a software reset
 648          * to the secure element. If the next command is still not
 649          * answering in time, we send to the CLF a secure element hardware
 650          * reset request.
 651          */
 652         /* hardware reset managed through VCC_UICC_OUT power supply */
 653         u8 param = 0x01;
 654         struct st_nci_info *info = (struct st_nci_info *) data;
 655
 656         pr_debug("\n");
 657
 658         info->se_info.bwi_active = false;
 659
 660         if (!info->se_info.xch_error) {
 661                 info->se_info.xch_error = true;
 662                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_APDU_READER_GATE,
 663                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 664         } else {
 665                 info->se_info.xch_error = false;
 666                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_DEVICE_MGNT_GATE,
 667                                 ST_NCI_EVT_SE_HARD_RESET, &param, 1);
 668         }
 669         info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
 670 }
 671
 672 static void st_nci_se_activation_timeout(unsigned long data)
 673 {
 674         struct st_nci_info *info = (struct st_nci_info *) data;
 675
 676         pr_debug("\n");
 677
 678         info->se_info.se_active = false;
 679
 680         complete(&info->se_info.req_completion);
 681 }
 682
 683 int st_nci_se_init(struct nci_dev *ndev)
 684 {
 685         struct st_nci_info *info = nci_get_drvdata(ndev);
 686
 687         init_completion(&info->se_info.req_completion);
 688         /* initialize timers */
 689         init_timer(&info->se_info.bwi_timer);
 690         info->se_info.bwi_timer.data = (unsigned long)info;
 691         info->se_info.bwi_timer.function = st_nci_se_wt_timeout;
 692         info->se_info.bwi_active = false;
 693
 694         init_timer(&info->se_info.se_active_timer);
 695         info->se_info.se_active_timer.data = (unsigned long)info;
 696         info->se_info.se_active_timer.function =
 697                         st_nci_se_activation_timeout;
 698         info->se_info.se_active = false;
 699
 700         info->se_info.xch_error = false;
 701
 702         info->se_info.wt_timeout =
 703                 ST_NCI_BWI_TO_TIMEOUT(ST_NCI_ATR_DEFAULT_BWI);
 704
 705         return 0;
 706 }
 707 EXPORT_SYMBOL(st_nci_se_init);
 708
 709 void st_nci_se_deinit(struct nci_dev *ndev)
 710 {
 711         struct st_nci_info *info = nci_get_drvdata(ndev);
 712
 713         if (info->se_info.bwi_active)
 714                 del_timer_sync(&info->se_info.bwi_timer);
 715         if (info->se_info.se_active)
 716                 del_timer_sync(&info->se_info.se_active_timer);
 717
 718         info->se_info.se_active = false;
 719         info->se_info.bwi_active = false;
 720 }
 721 EXPORT_SYMBOL(st_nci_se_deinit);
 722