drivers/nfc/st-nci/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 #include "st-nci_se.h"
  27
  28 struct st_nci_pipe_info {
  29         u8 pipe_state;
  30         u8 src_host_id;
  31         u8 src_gate_id;
  32         u8 dst_host_id;
  33         u8 dst_gate_id;
  34 } __packed;
  35
  36 /* Hosts */
  37 #define ST_NCI_HOST_CONTROLLER_ID     0x00
  38 #define ST_NCI_TERMINAL_HOST_ID       0x01
  39 #define ST_NCI_UICC_HOST_ID           0x02
  40 #define ST_NCI_ESE_HOST_ID            0xc0
  41
  42 /* Gates */
  43 #define ST_NCI_DEVICE_MGNT_GATE       0x01
  44 #define ST_NCI_APDU_READER_GATE       0xf0
  45 #define ST_NCI_CONNECTIVITY_GATE      0x41
  46
  47 /* Pipes */
  48 #define ST_NCI_DEVICE_MGNT_PIPE               0x02
  49
  50 /* Connectivity pipe only */
  51 #define ST_NCI_SE_COUNT_PIPE_UICC             0x01
  52 /* Connectivity + APDU Reader pipe */
  53 #define ST_NCI_SE_COUNT_PIPE_EMBEDDED         0x02
  54
  55 #define ST_NCI_SE_TO_HOT_PLUG                   1000 /* msecs */
  56 #define ST_NCI_SE_TO_PIPES                      2000
  57
  58 #define ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(x)   (x->data[0] & 0x80)
  59
  60 #define NCI_HCI_APDU_PARAM_ATR                     0x01
  61 #define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY       0x01
  62 #define NCI_HCI_ADMIN_PARAM_WHITELIST              0x03
  63 #define NCI_HCI_ADMIN_PARAM_HOST_LIST              0x04
  64
  65 #define ST_NCI_EVT_SE_HARD_RESET                0x20
  66 #define ST_NCI_EVT_TRANSMIT_DATA                0x10
  67 #define ST_NCI_EVT_WTX_REQUEST          0x11
  68 #define ST_NCI_EVT_SE_SOFT_RESET                0x11
  69 #define ST_NCI_EVT_SE_END_OF_APDU_TRANSFER      0x21
  70 #define ST_NCI_EVT_HOT_PLUG                     0x03
  71
  72 #define ST_NCI_SE_MODE_OFF                    0x00
  73 #define ST_NCI_SE_MODE_ON                     0x01
  74
  75 #define ST_NCI_EVT_CONNECTIVITY       0x10
  76 #define ST_NCI_EVT_TRANSACTION        0x12
  77
  78 #define ST_NCI_DM_GETINFO             0x13
  79 #define ST_NCI_DM_GETINFO_PIPE_LIST   0x02
  80 #define ST_NCI_DM_GETINFO_PIPE_INFO   0x01
  81 #define ST_NCI_DM_PIPE_CREATED        0x02
  82 #define ST_NCI_DM_PIPE_OPEN           0x04
  83 #define ST_NCI_DM_RF_ACTIVE           0x80
  84 #define ST_NCI_DM_DISCONNECT          0x30
  85
  86 #define ST_NCI_DM_IS_PIPE_OPEN(p) \
  87         ((p & 0x0f) == (ST_NCI_DM_PIPE_CREATED | ST_NCI_DM_PIPE_OPEN))
  88
  89 #define ST_NCI_ATR_DEFAULT_BWI        0x04
  90
  91 /*
  92  * WT = 2^BWI/10[s], convert into msecs and add a secure
  93  * room by increasing by 2 this timeout
  94  */
  95 #define ST_NCI_BWI_TO_TIMEOUT(x)      ((1 << x) * 200)
  96 #define ST_NCI_ATR_GET_Y_FROM_TD(x)   (x >> 4)
  97
  98 /* If TA is present bit 0 is set */
  99 #define ST_NCI_ATR_TA_PRESENT(x) (x & 0x01)
 100 /* If TB is present bit 1 is set */
 101 #define ST_NCI_ATR_TB_PRESENT(x) (x & 0x02)
 102
 103 #define ST_NCI_NUM_DEVICES           256
 104
 105 static DECLARE_BITMAP(dev_mask, ST_NCI_NUM_DEVICES);
 106
 107 /* Here are the mandatory pipe for st_nci */
 108 static struct nci_hci_gate st_nci_gates[] = {
 109         {NCI_HCI_ADMIN_GATE, NCI_HCI_ADMIN_PIPE,
 110                                         ST_NCI_HOST_CONTROLLER_ID},
 111         {NCI_HCI_LINK_MGMT_GATE, NCI_HCI_LINK_MGMT_PIPE,
 112                                         ST_NCI_HOST_CONTROLLER_ID},
 113         {ST_NCI_DEVICE_MGNT_GATE, ST_NCI_DEVICE_MGNT_PIPE,
 114                                         ST_NCI_HOST_CONTROLLER_ID},
 115
 116         /* Secure element pipes are created by secure element host */
 117         {ST_NCI_CONNECTIVITY_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
 118                                         ST_NCI_HOST_CONTROLLER_ID},
 119         {ST_NCI_APDU_READER_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
 120                                         ST_NCI_HOST_CONTROLLER_ID},
 121 };
 122
 123 static u8 st_nci_se_get_bwi(struct nci_dev *ndev)
 124 {
 125         int i;
 126         u8 td;
 127         struct st_nci_info *info = nci_get_drvdata(ndev);
 128
 129         /* Bits 8 to 5 of the first TB for T=1 encode BWI from zero to nine */
 130         for (i = 1; i < ST_NCI_ESE_MAX_LENGTH; i++) {
 131                 td = ST_NCI_ATR_GET_Y_FROM_TD(info->se_info.atr[i]);
 132                 if (ST_NCI_ATR_TA_PRESENT(td))
 133                         i++;
 134                 if (ST_NCI_ATR_TB_PRESENT(td)) {
 135                         i++;
 136                         return info->se_info.atr[i] >> 4;
 137                 }
 138         }
 139         return ST_NCI_ATR_DEFAULT_BWI;
 140 }
 141
 142 static void st_nci_se_get_atr(struct nci_dev *ndev)
 143 {
 144         struct st_nci_info *info = nci_get_drvdata(ndev);
 145         int r;
 146         struct sk_buff *skb;
 147
 148         r = nci_hci_get_param(ndev, ST_NCI_APDU_READER_GATE,
 149                                 NCI_HCI_APDU_PARAM_ATR, &skb);
 150         if (r < 0)
 151                 return;
 152
 153         if (skb->len <= ST_NCI_ESE_MAX_LENGTH) {
 154                 memcpy(info->se_info.atr, skb->data, skb->len);
 155
 156                 info->se_info.wt_timeout =
 157                         ST_NCI_BWI_TO_TIMEOUT(st_nci_se_get_bwi(ndev));
 158         }
 159         kfree_skb(skb);
 160 }
 161
 162 int st_nci_hci_load_session(struct nci_dev *ndev)
 163 {
 164         int i, j, r;
 165         struct sk_buff *skb_pipe_list, *skb_pipe_info;
 166         struct st_nci_pipe_info *dm_pipe_info;
 167         u8 pipe_list[] = { ST_NCI_DM_GETINFO_PIPE_LIST,
 168                         ST_NCI_TERMINAL_HOST_ID};
 169         u8 pipe_info[] = { ST_NCI_DM_GETINFO_PIPE_INFO,
 170                         ST_NCI_TERMINAL_HOST_ID, 0};
 171
 172         /* On ST_NCI device pipes number are dynamics
 173          * If pipes are already created, hci_dev_up will fail.
 174          * Doing a clear all pipe is a bad idea because:
 175          * - It does useless EEPROM cycling
 176          * - It might cause issue for secure elements support
 177          * (such as removing connectivity or APDU reader pipe)
 178          * A better approach on ST_NCI is to:
 179          * - get a pipe list for each host.
 180          * (eg: ST_NCI_HOST_CONTROLLER_ID for now).
 181          * (TODO Later on UICC HOST and eSE HOST)
 182          * - get pipe information
 183          * - match retrieved pipe list in st_nci_gates
 184          * ST_NCI_DEVICE_MGNT_GATE is a proprietary gate
 185          * with ST_NCI_DEVICE_MGNT_PIPE.
 186          * Pipe can be closed and need to be open.
 187          */
 188         r = nci_hci_connect_gate(ndev, ST_NCI_HOST_CONTROLLER_ID,
 189                                 ST_NCI_DEVICE_MGNT_GATE,
 190                                 ST_NCI_DEVICE_MGNT_PIPE);
 191         if (r < 0)
 192                 goto free_info;
 193
 194         /* Get pipe list */
 195         r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
 196                         ST_NCI_DM_GETINFO, pipe_list, sizeof(pipe_list),
 197                         &skb_pipe_list);
 198         if (r < 0)
 199                 goto free_info;
 200
 201         /* Complete the existing gate_pipe table */
 202         for (i = 0; i < skb_pipe_list->len; i++) {
 203                 pipe_info[2] = skb_pipe_list->data[i];
 204                 r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
 205                                         ST_NCI_DM_GETINFO, pipe_info,
 206                                         sizeof(pipe_info), &skb_pipe_info);
 207
 208                 if (r)
 209                         continue;
 210
 211                 /*
 212                  * Match pipe ID and gate ID
 213                  * Output format from ST21NFC_DM_GETINFO is:
 214                  * - pipe state (1byte)
 215                  * - source hid (1byte)
 216                  * - source gid (1byte)
 217                  * - destination hid (1byte)
 218                  * - destination gid (1byte)
 219                  */
 220                 dm_pipe_info = (struct st_nci_pipe_info *)skb_pipe_info->data;
 221                 if (dm_pipe_info->dst_gate_id == ST_NCI_APDU_READER_GATE &&
 222                     dm_pipe_info->src_host_id != ST_NCI_ESE_HOST_ID) {
 223                         pr_err("Unexpected apdu_reader pipe on host %x\n",
 224                                dm_pipe_info->src_host_id);
 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         }
 245
 246         memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
 247                sizeof(st_nci_gates));
 248
 249 free_info:
 250         kfree_skb(skb_pipe_info);
 251         kfree_skb(skb_pipe_list);
 252         return r;
 253 }
 254 EXPORT_SYMBOL_GPL(st_nci_hci_load_session);
 255
 256 static void st_nci_hci_admin_event_received(struct nci_dev *ndev,
 257                                               u8 event, struct sk_buff *skb)
 258 {
 259         struct st_nci_info *info = nci_get_drvdata(ndev);
 260
 261         switch (event) {
 262         case ST_NCI_EVT_HOT_PLUG:
 263                 if (info->se_info.se_active) {
 264                         if (!ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
 265                                 del_timer_sync(&info->se_info.se_active_timer);
 266                                 info->se_info.se_active = false;
 267                                 complete(&info->se_info.req_completion);
 268                         } else {
 269                                 mod_timer(&info->se_info.se_active_timer,
 270                                       jiffies +
 271                                       msecs_to_jiffies(ST_NCI_SE_TO_PIPES));
 272                         }
 273                 }
 274         break;
 275         }
 276 }
 277
 278 static int st_nci_hci_apdu_reader_event_received(struct nci_dev *ndev,
 279                                                    u8 event,
 280                                                    struct sk_buff *skb)
 281 {
 282         int r = 0;
 283         struct st_nci_info *info = nci_get_drvdata(ndev);
 284
 285         pr_debug("apdu reader gate event: %x\n", event);
 286
 287         switch (event) {
 288         case ST_NCI_EVT_TRANSMIT_DATA:
 289                 del_timer_sync(&info->se_info.bwi_timer);
 290                 info->se_info.bwi_active = false;
 291                 info->se_info.cb(info->se_info.cb_context,
 292                                  skb->data, skb->len, 0);
 293         break;
 294         case ST_NCI_EVT_WTX_REQUEST:
 295                 mod_timer(&info->se_info.bwi_timer, jiffies +
 296                           msecs_to_jiffies(info->se_info.wt_timeout));
 297         break;
 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  */
 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
 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 = (struct nfc_evt_transaction *)devm_kzalloc(dev,
 335                                             skb->len - 2, GFP_KERNEL);
 336
 337                 transaction->aid_len = skb->data[1];
 338                 memcpy(transaction->aid, &skb->data[2], transaction->aid_len);
 339
 340                 /* Check next byte is PARAMETERS tag (82) */
 341                 if (skb->data[transaction->aid_len + 2] !=
 342                     NFC_EVT_TRANSACTION_PARAMS_TAG)
 343                         return -EPROTO;
 344
 345                 transaction->params_len = skb->data[transaction->aid_len + 3];
 346                 memcpy(transaction->params, skb->data +
 347                        transaction->aid_len + 4, transaction->params_len);
 348
 349                 r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
 350                 break;
 351         default:
 352                 return 1;
 353         }
 354         kfree_skb(skb);
 355         return r;
 356 }
 357
 358 void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
 359                                  u8 event, struct sk_buff *skb)
 360 {
 361         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 362         u8 host = ndev->hci_dev->pipes[pipe].host;
 363
 364         switch (gate) {
 365         case NCI_HCI_ADMIN_GATE:
 366                 st_nci_hci_admin_event_received(ndev, event, skb);
 367         break;
 368         case ST_NCI_APDU_READER_GATE:
 369                 st_nci_hci_apdu_reader_event_received(ndev, event, skb);
 370         break;
 371         case ST_NCI_CONNECTIVITY_GATE:
 372                 st_nci_hci_connectivity_event_received(ndev, host, event,
 373                                                          skb);
 374         break;
 375         }
 376 }
 377 EXPORT_SYMBOL_GPL(st_nci_hci_event_received);
 378
 379
 380 void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
 381                                struct sk_buff *skb)
 382 {
 383         struct st_nci_info *info = nci_get_drvdata(ndev);
 384         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 385
 386         pr_debug("cmd: %x\n", cmd);
 387
 388         switch (cmd) {
 389         case NCI_HCI_ANY_OPEN_PIPE:
 390                 if (gate != ST_NCI_APDU_READER_GATE &&
 391                     ndev->hci_dev->pipes[pipe].host != ST_NCI_UICC_HOST_ID)
 392                         ndev->hci_dev->count_pipes++;
 393
 394                 if (ndev->hci_dev->count_pipes ==
 395                     ndev->hci_dev->expected_pipes) {
 396                         del_timer_sync(&info->se_info.se_active_timer);
 397                         info->se_info.se_active = false;
 398                         ndev->hci_dev->count_pipes = 0;
 399                         complete(&info->se_info.req_completion);
 400                 }
 401         break;
 402         }
 403 }
 404 EXPORT_SYMBOL_GPL(st_nci_hci_cmd_received);
 405
 406 /*
 407  * Remarks: On some early st_nci firmware, nci_nfcee_mode_set(0)
 408  * is rejected
 409  */
 410 static int st_nci_control_se(struct nci_dev *ndev, u8 se_idx,
 411                                    u8 state)
 412 {
 413         struct st_nci_info *info = nci_get_drvdata(ndev);
 414         int r;
 415         struct sk_buff *sk_host_list;
 416         u8 host_id;
 417
 418         switch (se_idx) {
 419         case ST_NCI_UICC_HOST_ID:
 420                 ndev->hci_dev->count_pipes = 0;
 421                 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_UICC;
 422                 break;
 423         case ST_NCI_ESE_HOST_ID:
 424                 ndev->hci_dev->count_pipes = 0;
 425                 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_EMBEDDED;
 426                 break;
 427         default:
 428                 return -EINVAL;
 429         }
 430
 431         /*
 432          * Wait for an EVT_HOT_PLUG in order to
 433          * retrieve a relevant host list.
 434          */
 435         reinit_completion(&info->se_info.req_completion);
 436         r = nci_nfcee_mode_set(ndev, se_idx, NCI_NFCEE_ENABLE);
 437         if (r != NCI_STATUS_OK)
 438                 return r;
 439
 440         mod_timer(&info->se_info.se_active_timer, jiffies +
 441                 msecs_to_jiffies(ST_NCI_SE_TO_HOT_PLUG));
 442         info->se_info.se_active = true;
 443
 444         /* Ignore return value and check in any case the host_list */
 445         wait_for_completion_interruptible(&info->se_info.req_completion);
 446
 447         /* There might be some "collision" after receiving a HOT_PLUG event
 448          * This may cause the CLF to not answer to the next hci command.
 449          * There is no possible synchronization to prevent this.
 450          * Adding a small delay is the only way to solve the issue.
 451          */
 452         usleep_range(3000, 5000);
 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         host_id = sk_host_list->data[sk_host_list->len - 1];
 460         kfree_skb(sk_host_list);
 461         if (state == ST_NCI_SE_MODE_ON && host_id == se_idx)
 462                 return se_idx;
 463         else if (state == ST_NCI_SE_MODE_OFF && host_id != se_idx)
 464                 return se_idx;
 465
 466         return -1;
 467 }
 468
 469 int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
 470 {
 471         int r;
 472
 473         pr_debug("st_nci_disable_se\n");
 474
 475         if (se_idx == NFC_SE_EMBEDDED) {
 476                 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 477                                 ST_NCI_EVT_SE_END_OF_APDU_TRANSFER, NULL, 0);
 478                 if (r < 0)
 479                         return r;
 480         }
 481
 482         return 0;
 483 }
 484 EXPORT_SYMBOL_GPL(st_nci_disable_se);
 485
 486 int st_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
 487 {
 488         int r;
 489
 490         pr_debug("st_nci_enable_se\n");
 491
 492         if (se_idx == ST_NCI_HCI_HOST_ID_ESE) {
 493                 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 494                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 495                 if (r < 0)
 496                         return r;
 497         }
 498
 499         return 0;
 500 }
 501 EXPORT_SYMBOL_GPL(st_nci_enable_se);
 502
 503 static int st_nci_hci_network_init(struct nci_dev *ndev)
 504 {
 505         struct core_conn_create_dest_spec_params *dest_params;
 506         struct dest_spec_params spec_params;
 507         struct nci_conn_info    *conn_info;
 508         int r, dev_num;
 509
 510         dest_params =
 511                 kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
 512                         sizeof(struct dest_spec_params), GFP_KERNEL);
 513         if (dest_params == NULL) {
 514                 r = -ENOMEM;
 515                 goto exit;
 516         }
 517
 518         dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
 519         dest_params->length = sizeof(struct dest_spec_params);
 520         spec_params.id = ndev->hci_dev->nfcee_id;
 521         spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
 522         memcpy(dest_params->value, &spec_params,
 523                sizeof(struct dest_spec_params));
 524         r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
 525                                  sizeof(struct core_conn_create_dest_spec_params) +
 526                                  sizeof(struct dest_spec_params),
 527                                  dest_params);
 528         if (r != NCI_STATUS_OK)
 529                 goto free_dest_params;
 530
 531         conn_info = ndev->hci_dev->conn_info;
 532         if (!conn_info)
 533                 goto free_dest_params;
 534
 535         memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
 536                sizeof(st_nci_gates));
 537
 538         /*
 539          * Session id must include the driver name + i2c bus addr
 540          * persistent info to discriminate 2 identical chips
 541          */
 542         dev_num = find_first_zero_bit(dev_mask, ST_NCI_NUM_DEVICES);
 543         if (dev_num >= ST_NCI_NUM_DEVICES) {
 544                 r = -ENODEV;
 545                 goto free_dest_params;
 546         }
 547
 548         scnprintf(ndev->hci_dev->init_data.session_id,
 549                   sizeof(ndev->hci_dev->init_data.session_id),
 550                   "%s%2x", "ST21BH", dev_num);
 551
 552         r = nci_hci_dev_session_init(ndev);
 553         if (r != NCI_HCI_ANY_OK)
 554                 goto free_dest_params;
 555
 556         r = nci_nfcee_mode_set(ndev, ndev->hci_dev->conn_info->id,
 557                                NCI_NFCEE_ENABLE);
 558         if (r != NCI_STATUS_OK)
 559                 goto free_dest_params;
 560
 561 free_dest_params:
 562         kfree(dest_params);
 563
 564 exit:
 565         return r;
 566 }
 567
 568 int st_nci_discover_se(struct nci_dev *ndev)
 569 {
 570         u8 param[2];
 571         int r;
 572         int se_count = 0;
 573
 574         pr_debug("st_nci_discover_se\n");
 575
 576         r = st_nci_hci_network_init(ndev);
 577         if (r != 0)
 578                 return r;
 579
 580         param[0] = ST_NCI_UICC_HOST_ID;
 581         param[1] = ST_NCI_HCI_HOST_ID_ESE;
 582         r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 583                                 NCI_HCI_ADMIN_PARAM_WHITELIST,
 584                                 param, sizeof(param));
 585         if (r != NCI_HCI_ANY_OK)
 586                 return r;
 587
 588         r = st_nci_control_se(ndev, ST_NCI_UICC_HOST_ID,
 589                                 ST_NCI_SE_MODE_ON);
 590         if (r == ST_NCI_UICC_HOST_ID) {
 591                 nfc_add_se(ndev->nfc_dev, ST_NCI_UICC_HOST_ID, NFC_SE_UICC);
 592                 se_count++;
 593         }
 594
 595         /* Try to enable eSE in order to check availability */
 596         r = st_nci_control_se(ndev, ST_NCI_HCI_HOST_ID_ESE,
 597                                 ST_NCI_SE_MODE_ON);
 598         if (r == ST_NCI_HCI_HOST_ID_ESE) {
 599                 nfc_add_se(ndev->nfc_dev, ST_NCI_HCI_HOST_ID_ESE,
 600                            NFC_SE_EMBEDDED);
 601                 se_count++;
 602                 st_nci_se_get_atr(ndev);
 603         }
 604
 605         return !se_count;
 606 }
 607 EXPORT_SYMBOL_GPL(st_nci_discover_se);
 608
 609 int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
 610                        u8 *apdu, size_t apdu_length,
 611                        se_io_cb_t cb, void *cb_context)
 612 {
 613         struct st_nci_info *info = nci_get_drvdata(ndev);
 614
 615         pr_debug("\n");
 616
 617         switch (se_idx) {
 618         case ST_NCI_HCI_HOST_ID_ESE:
 619                 info->se_info.cb = cb;
 620                 info->se_info.cb_context = cb_context;
 621                 mod_timer(&info->se_info.bwi_timer, jiffies +
 622                           msecs_to_jiffies(info->se_info.wt_timeout));
 623                 info->se_info.bwi_active = true;
 624                 return nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 625                                         ST_NCI_EVT_TRANSMIT_DATA, apdu,
 626                                         apdu_length);
 627         default:
 628                 return -ENODEV;
 629         }
 630 }
 631 EXPORT_SYMBOL(st_nci_se_io);
 632
 633 static void st_nci_se_wt_timeout(unsigned long data)
 634 {
 635         /*
 636          * No answer from the secure element
 637          * within the defined timeout.
 638          * Let's send a reset request as recovery procedure.
 639          * According to the situation, we first try to send a software reset
 640          * to the secure element. If the next command is still not
 641          * answering in time, we send to the CLF a secure element hardware
 642          * reset request.
 643          */
 644         /* hardware reset managed through VCC_UICC_OUT power supply */
 645         u8 param = 0x01;
 646         struct st_nci_info *info = (struct st_nci_info *) data;
 647
 648         pr_debug("\n");
 649
 650         info->se_info.bwi_active = false;
 651
 652         if (!info->se_info.xch_error) {
 653                 info->se_info.xch_error = true;
 654                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_APDU_READER_GATE,
 655                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 656         } else {
 657                 info->se_info.xch_error = false;
 658                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_DEVICE_MGNT_GATE,
 659                                 ST_NCI_EVT_SE_HARD_RESET, &param, 1);
 660         }
 661         info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
 662 }
 663
 664 static void st_nci_se_activation_timeout(unsigned long data)
 665 {
 666         struct st_nci_info *info = (struct st_nci_info *) data;
 667
 668         pr_debug("\n");
 669
 670         info->se_info.se_active = false;
 671
 672         complete(&info->se_info.req_completion);
 673 }
 674
 675 int st_nci_se_init(struct nci_dev *ndev)
 676 {
 677         struct st_nci_info *info = nci_get_drvdata(ndev);
 678
 679         init_completion(&info->se_info.req_completion);
 680         /* initialize timers */
 681         init_timer(&info->se_info.bwi_timer);
 682         info->se_info.bwi_timer.data = (unsigned long)info;
 683         info->se_info.bwi_timer.function = st_nci_se_wt_timeout;
 684         info->se_info.bwi_active = false;
 685
 686         init_timer(&info->se_info.se_active_timer);
 687         info->se_info.se_active_timer.data = (unsigned long)info;
 688         info->se_info.se_active_timer.function =
 689                         st_nci_se_activation_timeout;
 690         info->se_info.se_active = false;
 691
 692         info->se_info.xch_error = false;
 693
 694         info->se_info.wt_timeout =
 695                 ST_NCI_BWI_TO_TIMEOUT(ST_NCI_ATR_DEFAULT_BWI);
 696
 697         return 0;
 698 }
 699 EXPORT_SYMBOL(st_nci_se_init);
 700
 701 void st_nci_se_deinit(struct nci_dev *ndev)
 702 {
 703         struct st_nci_info *info = nci_get_drvdata(ndev);
 704
 705         if (info->se_info.bwi_active)
 706                 del_timer_sync(&info->se_info.bwi_timer);
 707         if (info->se_info.se_active)
 708                 del_timer_sync(&info->se_info.se_active_timer);
 709
 710         info->se_info.se_active = false;
 711         info->se_info.bwi_active = false;
 712 }
 713 EXPORT_SYMBOL(st_nci_se_deinit);
 714