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         /* Secure element pipes are created by secure element host */
 116         {ST_NCI_CONNECTIVITY_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
 117                                         ST_NCI_HOST_CONTROLLER_ID},
 118         {ST_NCI_APDU_READER_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
 119                                         ST_NCI_HOST_CONTROLLER_ID},
 120 };
 121
 122 static u8 st_nci_se_get_bwi(struct nci_dev *ndev)
 123 {
 124         int i;
 125         u8 td;
 126         struct st_nci_info *info = nci_get_drvdata(ndev);
 127
 128         /* Bits 8 to 5 of the first TB for T=1 encode BWI from zero to nine */
 129         for (i = 1; i < ST_NCI_ESE_MAX_LENGTH; i++) {
 130                 td = ST_NCI_ATR_GET_Y_FROM_TD(info->se_info.atr[i]);
 131                 if (ST_NCI_ATR_TA_PRESENT(td))
 132                         i++;
 133                 if (ST_NCI_ATR_TB_PRESENT(td)) {
 134                         i++;
 135                         return info->se_info.atr[i] >> 4;
 136                 }
 137         }
 138         return ST_NCI_ATR_DEFAULT_BWI;
 139 }
 140
 141 static void st_nci_se_get_atr(struct nci_dev *ndev)
 142 {
 143         struct st_nci_info *info = nci_get_drvdata(ndev);
 144         int r;
 145         struct sk_buff *skb;
 146
 147         r = nci_hci_get_param(ndev, ST_NCI_APDU_READER_GATE,
 148                                 NCI_HCI_APDU_PARAM_ATR, &skb);
 149         if (r < 0)
 150                 return;
 151
 152         if (skb->len <= ST_NCI_ESE_MAX_LENGTH) {
 153                 memcpy(info->se_info.atr, skb->data, skb->len);
 154
 155                 info->se_info.wt_timeout =
 156                         ST_NCI_BWI_TO_TIMEOUT(st_nci_se_get_bwi(ndev));
 157         }
 158         kfree_skb(skb);
 159 }
 160
 161 int st_nci_hci_load_session(struct nci_dev *ndev)
 162 {
 163         int i, j, r;
 164         struct sk_buff *skb_pipe_list, *skb_pipe_info;
 165         struct st_nci_pipe_info *dm_pipe_info;
 166         u8 pipe_list[] = { ST_NCI_DM_GETINFO_PIPE_LIST,
 167                         ST_NCI_TERMINAL_HOST_ID};
 168         u8 pipe_info[] = { ST_NCI_DM_GETINFO_PIPE_INFO,
 169                         ST_NCI_TERMINAL_HOST_ID, 0};
 170
 171         /* On ST_NCI device pipes number are dynamics
 172          * If pipes are already created, hci_dev_up will fail.
 173          * Doing a clear all pipe is a bad idea because:
 174          * - It does useless EEPROM cycling
 175          * - It might cause issue for secure elements support
 176          * (such as removing connectivity or APDU reader pipe)
 177          * A better approach on ST_NCI is to:
 178          * - get a pipe list for each host.
 179          * (eg: ST_NCI_HOST_CONTROLLER_ID for now).
 180          * (TODO Later on UICC HOST and eSE HOST)
 181          * - get pipe information
 182          * - match retrieved pipe list in st_nci_gates
 183          * ST_NCI_DEVICE_MGNT_GATE is a proprietary gate
 184          * with ST_NCI_DEVICE_MGNT_PIPE.
 185          * Pipe can be closed and need to be open.
 186          */
 187         r = nci_hci_connect_gate(ndev, ST_NCI_HOST_CONTROLLER_ID,
 188                                 ST_NCI_DEVICE_MGNT_GATE,
 189                                 ST_NCI_DEVICE_MGNT_PIPE);
 190         if (r < 0)
 191                 return r;
 192
 193         /* Get pipe list */
 194         r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
 195                         ST_NCI_DM_GETINFO, pipe_list, sizeof(pipe_list),
 196                         &skb_pipe_list);
 197         if (r < 0)
 198                 return r;
 199
 200         /* Complete the existing gate_pipe table */
 201         for (i = 0; i < skb_pipe_list->len; i++) {
 202                 pipe_info[2] = skb_pipe_list->data[i];
 203                 r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
 204                                         ST_NCI_DM_GETINFO, pipe_info,
 205                                         sizeof(pipe_info), &skb_pipe_info);
 206
 207                 if (r)
 208                         continue;
 209
 210                 /*
 211                  * Match pipe ID and gate ID
 212                  * Output format from ST21NFC_DM_GETINFO is:
 213                  * - pipe state (1byte)
 214                  * - source hid (1byte)
 215                  * - source gid (1byte)
 216                  * - destination hid (1byte)
 217                  * - destination gid (1byte)
 218                  */
 219                 dm_pipe_info = (struct st_nci_pipe_info *)skb_pipe_info->data;
 220                 if (dm_pipe_info->dst_gate_id == ST_NCI_APDU_READER_GATE &&
 221                     dm_pipe_info->src_host_id != ST_NCI_ESE_HOST_ID) {
 222                         pr_err("Unexpected apdu_reader pipe on host %x\n",
 223                                dm_pipe_info->src_host_id);
 224                         kfree_skb(skb_pipe_info);
 225                         continue;
 226                 }
 227
 228                 for (j = 0; (j < ARRAY_SIZE(st_nci_gates)) &&
 229                      (st_nci_gates[j].gate != dm_pipe_info->dst_gate_id); j++)
 230                         ;
 231
 232                 if (j < ARRAY_SIZE(st_nci_gates) &&
 233                     st_nci_gates[j].gate == dm_pipe_info->dst_gate_id &&
 234                     ST_NCI_DM_IS_PIPE_OPEN(dm_pipe_info->pipe_state)) {
 235                         st_nci_gates[j].pipe = pipe_info[2];
 236
 237                         ndev->hci_dev->gate2pipe[st_nci_gates[j].gate] =
 238                                                 st_nci_gates[j].pipe;
 239                         ndev->hci_dev->pipes[st_nci_gates[j].pipe].gate =
 240                                                 st_nci_gates[j].gate;
 241                         ndev->hci_dev->pipes[st_nci_gates[j].pipe].host =
 242                                                 dm_pipe_info->src_host_id;
 243                 }
 244                 kfree_skb(skb_pipe_info);
 245         }
 246
 247         memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
 248                sizeof(st_nci_gates));
 249
 250         kfree_skb(skb_pipe_list);
 251         return r;
 252 }
 253 EXPORT_SYMBOL_GPL(st_nci_hci_load_session);
 254
 255 static void st_nci_hci_admin_event_received(struct nci_dev *ndev,
 256                                               u8 event, struct sk_buff *skb)
 257 {
 258         struct st_nci_info *info = nci_get_drvdata(ndev);
 259
 260         switch (event) {
 261         case ST_NCI_EVT_HOT_PLUG:
 262                 if (info->se_info.se_active) {
 263                         if (!ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
 264                                 del_timer_sync(&info->se_info.se_active_timer);
 265                                 info->se_info.se_active = false;
 266                                 complete(&info->se_info.req_completion);
 267                         } else {
 268                                 mod_timer(&info->se_info.se_active_timer,
 269                                       jiffies +
 270                                       msecs_to_jiffies(ST_NCI_SE_TO_PIPES));
 271                         }
 272                 }
 273         break;
 274         }
 275 }
 276
 277 static int st_nci_hci_apdu_reader_event_received(struct nci_dev *ndev,
 278                                                    u8 event,
 279                                                    struct sk_buff *skb)
 280 {
 281         int r = 0;
 282         struct st_nci_info *info = nci_get_drvdata(ndev);
 283
 284         pr_debug("apdu reader gate event: %x\n", event);
 285
 286         switch (event) {
 287         case ST_NCI_EVT_TRANSMIT_DATA:
 288                 del_timer_sync(&info->se_info.bwi_timer);
 289                 info->se_info.bwi_active = false;
 290                 info->se_info.cb(info->se_info.cb_context,
 291                                  skb->data, skb->len, 0);
 292         break;
 293         case ST_NCI_EVT_WTX_REQUEST:
 294                 mod_timer(&info->se_info.bwi_timer, jiffies +
 295                           msecs_to_jiffies(info->se_info.wt_timeout));
 296         break;
 297         }
 298
 299         kfree_skb(skb);
 300         return r;
 301 }
 302
 303 /*
 304  * Returns:
 305  * <= 0: driver handled the event, skb consumed
 306  *    1: driver does not handle the event, please do standard processing
 307  */
 308 static int st_nci_hci_connectivity_event_received(struct nci_dev *ndev,
 309                                                 u8 host, u8 event,
 310                                                 struct sk_buff *skb)
 311 {
 312         int r = 0;
 313         struct device *dev = &ndev->nfc_dev->dev;
 314         struct nfc_evt_transaction *transaction;
 315
 316         pr_debug("connectivity gate event: %x\n", event);
 317
 318         switch (event) {
 319         case ST_NCI_EVT_CONNECTIVITY:
 320
 321         break;
 322         case ST_NCI_EVT_TRANSACTION:
 323                 /* According to specification etsi 102 622
 324                  * 11.2.2.4 EVT_TRANSACTION Table 52
 325                  * Description  Tag     Length
 326                  * AID          81      5 to 16
 327                  * PARAMETERS   82      0 to 255
 328                  */
 329                 if (skb->len < NFC_MIN_AID_LENGTH + 2 &&
 330                     skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)
 331                         return -EPROTO;
 332
 333                 transaction = (struct nfc_evt_transaction *)devm_kzalloc(dev,
 334                                             skb->len - 2, GFP_KERNEL);
 335
 336                 transaction->aid_len = skb->data[1];
 337                 memcpy(transaction->aid, &skb->data[2], transaction->aid_len);
 338
 339                 /* Check next byte is PARAMETERS tag (82) */
 340                 if (skb->data[transaction->aid_len + 2] !=
 341                     NFC_EVT_TRANSACTION_PARAMS_TAG)
 342                         return -EPROTO;
 343
 344                 transaction->params_len = skb->data[transaction->aid_len + 3];
 345                 memcpy(transaction->params, skb->data +
 346                        transaction->aid_len + 4, transaction->params_len);
 347
 348                 r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
 349                 break;
 350         default:
 351                 return 1;
 352         }
 353         kfree_skb(skb);
 354         return r;
 355 }
 356
 357 void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
 358                                  u8 event, struct sk_buff *skb)
 359 {
 360         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 361         u8 host = ndev->hci_dev->pipes[pipe].host;
 362
 363         switch (gate) {
 364         case NCI_HCI_ADMIN_GATE:
 365                 st_nci_hci_admin_event_received(ndev, event, skb);
 366         break;
 367         case ST_NCI_APDU_READER_GATE:
 368                 st_nci_hci_apdu_reader_event_received(ndev, event, skb);
 369         break;
 370         case ST_NCI_CONNECTIVITY_GATE:
 371                 st_nci_hci_connectivity_event_received(ndev, host, event,
 372                                                          skb);
 373         break;
 374         }
 375 }
 376 EXPORT_SYMBOL_GPL(st_nci_hci_event_received);
 377
 378
 379 void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
 380                                struct sk_buff *skb)
 381 {
 382         struct st_nci_info *info = nci_get_drvdata(ndev);
 383         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 384
 385         pr_debug("cmd: %x\n", cmd);
 386
 387         switch (cmd) {
 388         case NCI_HCI_ANY_OPEN_PIPE:
 389                 if (gate != ST_NCI_APDU_READER_GATE &&
 390                     ndev->hci_dev->pipes[pipe].host != ST_NCI_UICC_HOST_ID)
 391                         ndev->hci_dev->count_pipes++;
 392
 393                 if (ndev->hci_dev->count_pipes ==
 394                     ndev->hci_dev->expected_pipes) {
 395                         del_timer_sync(&info->se_info.se_active_timer);
 396                         info->se_info.se_active = false;
 397                         ndev->hci_dev->count_pipes = 0;
 398                         complete(&info->se_info.req_completion);
 399                 }
 400         break;
 401         }
 402 }
 403 EXPORT_SYMBOL_GPL(st_nci_hci_cmd_received);
 404
 405 /*
 406  * Remarks: On some early st_nci firmware, nci_nfcee_mode_set(0)
 407  * is rejected
 408  */
 409 static int st_nci_control_se(struct nci_dev *ndev, u8 se_idx,
 410                                    u8 state)
 411 {
 412         struct st_nci_info *info = nci_get_drvdata(ndev);
 413         int r;
 414         struct sk_buff *sk_host_list;
 415         u8 host_id;
 416
 417         switch (se_idx) {
 418         case ST_NCI_UICC_HOST_ID:
 419                 ndev->hci_dev->count_pipes = 0;
 420                 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_UICC;
 421                 break;
 422         case ST_NCI_ESE_HOST_ID:
 423                 ndev->hci_dev->count_pipes = 0;
 424                 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_EMBEDDED;
 425                 break;
 426         default:
 427                 return -EINVAL;
 428         }
 429
 430         /*
 431          * Wait for an EVT_HOT_PLUG in order to
 432          * retrieve a relevant host list.
 433          */
 434         reinit_completion(&info->se_info.req_completion);
 435         r = nci_nfcee_mode_set(ndev, se_idx, NCI_NFCEE_ENABLE);
 436         if (r != NCI_STATUS_OK)
 437                 return r;
 438
 439         mod_timer(&info->se_info.se_active_timer, jiffies +
 440                 msecs_to_jiffies(ST_NCI_SE_TO_HOT_PLUG));
 441         info->se_info.se_active = true;
 442
 443         /* Ignore return value and check in any case the host_list */
 444         wait_for_completion_interruptible(&info->se_info.req_completion);
 445
 446         /* There might be some "collision" after receiving a HOT_PLUG event
 447          * This may cause the CLF to not answer to the next hci command.
 448          * There is no possible synchronization to prevent this.
 449          * Adding a small delay is the only way to solve the issue.
 450          */
 451         usleep_range(3000, 5000);
 452
 453         r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 454                         NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
 455         if (r != NCI_HCI_ANY_OK)
 456                 return r;
 457
 458         host_id = sk_host_list->data[sk_host_list->len - 1];
 459         kfree_skb(sk_host_list);
 460         if (state == ST_NCI_SE_MODE_ON && host_id == se_idx)
 461                 return se_idx;
 462         else if (state == ST_NCI_SE_MODE_OFF && host_id != se_idx)
 463                 return se_idx;
 464
 465         return -1;
 466 }
 467
 468 int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
 469 {
 470         int r;
 471
 472         pr_debug("st_nci_disable_se\n");
 473
 474         if (se_idx == NFC_SE_EMBEDDED) {
 475                 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 476                                 ST_NCI_EVT_SE_END_OF_APDU_TRANSFER, NULL, 0);
 477                 if (r < 0)
 478                         return r;
 479         }
 480
 481         return 0;
 482 }
 483 EXPORT_SYMBOL_GPL(st_nci_disable_se);
 484
 485 int st_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
 486 {
 487         int r;
 488
 489         pr_debug("st_nci_enable_se\n");
 490
 491         if (se_idx == ST_NCI_HCI_HOST_ID_ESE) {
 492                 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 493                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 494                 if (r < 0)
 495                         return r;
 496         }
 497
 498         return 0;
 499 }
 500 EXPORT_SYMBOL_GPL(st_nci_enable_se);
 501
 502 static int st_nci_hci_network_init(struct nci_dev *ndev)
 503 {
 504         struct core_conn_create_dest_spec_params *dest_params;
 505         struct dest_spec_params spec_params;
 506         struct nci_conn_info    *conn_info;
 507         int r, dev_num;
 508
 509         dest_params =
 510                 kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
 511                         sizeof(struct dest_spec_params), GFP_KERNEL);
 512         if (dest_params == NULL) {
 513                 r = -ENOMEM;
 514                 goto exit;
 515         }
 516
 517         dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
 518         dest_params->length = sizeof(struct dest_spec_params);
 519         spec_params.id = ndev->hci_dev->nfcee_id;
 520         spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
 521         memcpy(dest_params->value, &spec_params,
 522                sizeof(struct dest_spec_params));
 523         r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
 524                                  sizeof(struct core_conn_create_dest_spec_params) +
 525                                  sizeof(struct dest_spec_params),
 526                                  dest_params);
 527         if (r != NCI_STATUS_OK)
 528                 goto free_dest_params;
 529
 530         conn_info = ndev->hci_dev->conn_info;
 531         if (!conn_info)
 532                 goto free_dest_params;
 533
 534         memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
 535                sizeof(st_nci_gates));
 536
 537         /*
 538          * Session id must include the driver name + i2c bus addr
 539          * persistent info to discriminate 2 identical chips
 540          */
 541         dev_num = find_first_zero_bit(dev_mask, ST_NCI_NUM_DEVICES);
 542         if (dev_num >= ST_NCI_NUM_DEVICES) {
 543                 r = -ENODEV;
 544                 goto free_dest_params;
 545         }
 546
 547         scnprintf(ndev->hci_dev->init_data.session_id,
 548                   sizeof(ndev->hci_dev->init_data.session_id),
 549                   "%s%2x", "ST21BH", dev_num);
 550
 551         r = nci_hci_dev_session_init(ndev);
 552         if (r != NCI_HCI_ANY_OK)
 553                 goto free_dest_params;
 554
 555         r = nci_nfcee_mode_set(ndev, ndev->hci_dev->conn_info->id,
 556                                NCI_NFCEE_ENABLE);
 557         if (r != NCI_STATUS_OK)
 558                 goto free_dest_params;
 559
 560 free_dest_params:
 561         kfree(dest_params);
 562
 563 exit:
 564         return r;
 565 }
 566
 567 int st_nci_discover_se(struct nci_dev *ndev)
 568 {
 569         u8 param[2];
 570         int r;
 571         int se_count = 0;
 572
 573         pr_debug("st_nci_discover_se\n");
 574
 575         r = st_nci_hci_network_init(ndev);
 576         if (r != 0)
 577                 return r;
 578
 579         param[0] = ST_NCI_UICC_HOST_ID;
 580         param[1] = ST_NCI_HCI_HOST_ID_ESE;
 581         r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 582                                 NCI_HCI_ADMIN_PARAM_WHITELIST,
 583                                 param, sizeof(param));
 584         if (r != NCI_HCI_ANY_OK)
 585                 return r;
 586
 587         r = st_nci_control_se(ndev, ST_NCI_UICC_HOST_ID,
 588                                 ST_NCI_SE_MODE_ON);
 589         if (r == ST_NCI_UICC_HOST_ID) {
 590                 nfc_add_se(ndev->nfc_dev, ST_NCI_UICC_HOST_ID, NFC_SE_UICC);
 591                 se_count++;
 592         }
 593
 594         /* Try to enable eSE in order to check availability */
 595         r = st_nci_control_se(ndev, ST_NCI_HCI_HOST_ID_ESE,
 596                                 ST_NCI_SE_MODE_ON);
 597         if (r == ST_NCI_HCI_HOST_ID_ESE) {
 598                 nfc_add_se(ndev->nfc_dev, ST_NCI_HCI_HOST_ID_ESE,
 599                            NFC_SE_EMBEDDED);
 600                 se_count++;
 601                 st_nci_se_get_atr(ndev);
 602         }
 603
 604         return !se_count;
 605 }
 606 EXPORT_SYMBOL_GPL(st_nci_discover_se);
 607
 608 int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
 609                        u8 *apdu, size_t apdu_length,
 610                        se_io_cb_t cb, void *cb_context)
 611 {
 612         struct st_nci_info *info = nci_get_drvdata(ndev);
 613
 614         pr_debug("\n");
 615
 616         switch (se_idx) {
 617         case ST_NCI_HCI_HOST_ID_ESE:
 618                 info->se_info.cb = cb;
 619                 info->se_info.cb_context = cb_context;
 620                 mod_timer(&info->se_info.bwi_timer, jiffies +
 621                           msecs_to_jiffies(info->se_info.wt_timeout));
 622                 info->se_info.bwi_active = true;
 623                 return nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 624                                         ST_NCI_EVT_TRANSMIT_DATA, apdu,
 625                                         apdu_length);
 626         default:
 627                 return -ENODEV;
 628         }
 629 }
 630 EXPORT_SYMBOL(st_nci_se_io);
 631
 632 static void st_nci_se_wt_timeout(unsigned long data)
 633 {
 634         /*
 635          * No answer from the secure element
 636          * within the defined timeout.
 637          * Let's send a reset request as recovery procedure.
 638          * According to the situation, we first try to send a software reset
 639          * to the secure element. If the next command is still not
 640          * answering in time, we send to the CLF a secure element hardware
 641          * reset request.
 642          */
 643         /* hardware reset managed through VCC_UICC_OUT power supply */
 644         u8 param = 0x01;
 645         struct st_nci_info *info = (struct st_nci_info *) data;
 646
 647         pr_debug("\n");
 648
 649         info->se_info.bwi_active = false;
 650
 651         if (!info->se_info.xch_error) {
 652                 info->se_info.xch_error = true;
 653                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_APDU_READER_GATE,
 654                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 655         } else {
 656                 info->se_info.xch_error = false;
 657                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_DEVICE_MGNT_GATE,
 658                                 ST_NCI_EVT_SE_HARD_RESET, &param, 1);
 659         }
 660         info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
 661 }
 662
 663 static void st_nci_se_activation_timeout(unsigned long data)
 664 {
 665         struct st_nci_info *info = (struct st_nci_info *) data;
 666
 667         pr_debug("\n");
 668
 669         info->se_info.se_active = false;
 670
 671         complete(&info->se_info.req_completion);
 672 }
 673
 674 int st_nci_se_init(struct nci_dev *ndev)
 675 {
 676         struct st_nci_info *info = nci_get_drvdata(ndev);
 677
 678         init_completion(&info->se_info.req_completion);
 679         /* initialize timers */
 680         init_timer(&info->se_info.bwi_timer);
 681         info->se_info.bwi_timer.data = (unsigned long)info;
 682         info->se_info.bwi_timer.function = st_nci_se_wt_timeout;
 683         info->se_info.bwi_active = false;
 684
 685         init_timer(&info->se_info.se_active_timer);
 686         info->se_info.se_active_timer.data = (unsigned long)info;
 687         info->se_info.se_active_timer.function =
 688                         st_nci_se_activation_timeout;
 689         info->se_info.se_active = false;
 690
 691         info->se_info.xch_error = false;
 692
 693         info->se_info.wt_timeout =
 694                 ST_NCI_BWI_TO_TIMEOUT(ST_NCI_ATR_DEFAULT_BWI);
 695
 696         return 0;
 697 }
 698 EXPORT_SYMBOL(st_nci_se_init);
 699
 700 void st_nci_se_deinit(struct nci_dev *ndev)
 701 {
 702         struct st_nci_info *info = nci_get_drvdata(ndev);
 703
 704         if (info->se_info.bwi_active)
 705                 del_timer_sync(&info->se_info.bwi_timer);
 706         if (info->se_info.se_active)
 707                 del_timer_sync(&info->se_info.se_active_timer);
 708
 709         info->se_info.se_active = false;
 710         info->se_info.bwi_active = false;
 711 }
 712 EXPORT_SYMBOL(st_nci_se_deinit);
 713