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         /*
 248          * 3 gates have a well known pipe ID. Only NCI_HCI_LINK_MGMT_GATE
 249          * is not yet open at this stage.
 250          */
 251         r = nci_hci_connect_gate(ndev, ST_NCI_HOST_CONTROLLER_ID,
 252                                  NCI_HCI_LINK_MGMT_GATE,
 253                                  NCI_HCI_LINK_MGMT_PIPE);
 254
 255         kfree_skb(skb_pipe_list);
 256         return r;
 257 }
 258 EXPORT_SYMBOL_GPL(st_nci_hci_load_session);
 259
 260 static void st_nci_hci_admin_event_received(struct nci_dev *ndev,
 261                                               u8 event, struct sk_buff *skb)
 262 {
 263         struct st_nci_info *info = nci_get_drvdata(ndev);
 264
 265         switch (event) {
 266         case ST_NCI_EVT_HOT_PLUG:
 267                 if (info->se_info.se_active) {
 268                         if (!ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
 269                                 del_timer_sync(&info->se_info.se_active_timer);
 270                                 info->se_info.se_active = false;
 271                                 complete(&info->se_info.req_completion);
 272                         } else {
 273                                 mod_timer(&info->se_info.se_active_timer,
 274                                       jiffies +
 275                                       msecs_to_jiffies(ST_NCI_SE_TO_PIPES));
 276                         }
 277                 }
 278         break;
 279         }
 280 }
 281
 282 static int st_nci_hci_apdu_reader_event_received(struct nci_dev *ndev,
 283                                                    u8 event,
 284                                                    struct sk_buff *skb)
 285 {
 286         int r = 0;
 287         struct st_nci_info *info = nci_get_drvdata(ndev);
 288
 289         pr_debug("apdu reader gate event: %x\n", event);
 290
 291         switch (event) {
 292         case ST_NCI_EVT_TRANSMIT_DATA:
 293                 del_timer_sync(&info->se_info.bwi_timer);
 294                 info->se_info.bwi_active = false;
 295                 info->se_info.cb(info->se_info.cb_context,
 296                                  skb->data, skb->len, 0);
 297         break;
 298         case ST_NCI_EVT_WTX_REQUEST:
 299                 mod_timer(&info->se_info.bwi_timer, jiffies +
 300                           msecs_to_jiffies(info->se_info.wt_timeout));
 301         break;
 302         }
 303
 304         kfree_skb(skb);
 305         return r;
 306 }
 307
 308 /*
 309  * Returns:
 310  * <= 0: driver handled the event, skb consumed
 311  *    1: driver does not handle the event, please do standard processing
 312  */
 313 static int st_nci_hci_connectivity_event_received(struct nci_dev *ndev,
 314                                                 u8 host, u8 event,
 315                                                 struct sk_buff *skb)
 316 {
 317         int r = 0;
 318         struct device *dev = &ndev->nfc_dev->dev;
 319         struct nfc_evt_transaction *transaction;
 320
 321         pr_debug("connectivity gate event: %x\n", event);
 322
 323         switch (event) {
 324         case ST_NCI_EVT_CONNECTIVITY:
 325
 326         break;
 327         case ST_NCI_EVT_TRANSACTION:
 328                 /* According to specification etsi 102 622
 329                  * 11.2.2.4 EVT_TRANSACTION Table 52
 330                  * Description  Tag     Length
 331                  * AID          81      5 to 16
 332                  * PARAMETERS   82      0 to 255
 333                  */
 334                 if (skb->len < NFC_MIN_AID_LENGTH + 2 &&
 335                     skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)
 336                         return -EPROTO;
 337
 338                 transaction = (struct nfc_evt_transaction *)devm_kzalloc(dev,
 339                                             skb->len - 2, GFP_KERNEL);
 340
 341                 transaction->aid_len = skb->data[1];
 342                 memcpy(transaction->aid, &skb->data[2], transaction->aid_len);
 343
 344                 /* Check next byte is PARAMETERS tag (82) */
 345                 if (skb->data[transaction->aid_len + 2] !=
 346                     NFC_EVT_TRANSACTION_PARAMS_TAG)
 347                         return -EPROTO;
 348
 349                 transaction->params_len = skb->data[transaction->aid_len + 3];
 350                 memcpy(transaction->params, skb->data +
 351                        transaction->aid_len + 4, transaction->params_len);
 352
 353                 r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
 354                 break;
 355         default:
 356                 return 1;
 357         }
 358         kfree_skb(skb);
 359         return r;
 360 }
 361
 362 void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
 363                                  u8 event, struct sk_buff *skb)
 364 {
 365         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 366         u8 host = ndev->hci_dev->pipes[pipe].host;
 367
 368         switch (gate) {
 369         case NCI_HCI_ADMIN_GATE:
 370                 st_nci_hci_admin_event_received(ndev, event, skb);
 371         break;
 372         case ST_NCI_APDU_READER_GATE:
 373                 st_nci_hci_apdu_reader_event_received(ndev, event, skb);
 374         break;
 375         case ST_NCI_CONNECTIVITY_GATE:
 376                 st_nci_hci_connectivity_event_received(ndev, host, event,
 377                                                          skb);
 378         break;
 379         }
 380 }
 381 EXPORT_SYMBOL_GPL(st_nci_hci_event_received);
 382
 383
 384 void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
 385                                struct sk_buff *skb)
 386 {
 387         struct st_nci_info *info = nci_get_drvdata(ndev);
 388         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 389
 390         pr_debug("cmd: %x\n", cmd);
 391
 392         switch (cmd) {
 393         case NCI_HCI_ANY_OPEN_PIPE:
 394                 if (gate != ST_NCI_APDU_READER_GATE &&
 395                     ndev->hci_dev->pipes[pipe].host != ST_NCI_UICC_HOST_ID)
 396                         ndev->hci_dev->count_pipes++;
 397
 398                 if (ndev->hci_dev->count_pipes ==
 399                     ndev->hci_dev->expected_pipes) {
 400                         del_timer_sync(&info->se_info.se_active_timer);
 401                         info->se_info.se_active = false;
 402                         ndev->hci_dev->count_pipes = 0;
 403                         complete(&info->se_info.req_completion);
 404                 }
 405         break;
 406         }
 407 }
 408 EXPORT_SYMBOL_GPL(st_nci_hci_cmd_received);
 409
 410 /*
 411  * Remarks: On some early st_nci firmware, nci_nfcee_mode_set(0)
 412  * is rejected
 413  */
 414 static int st_nci_control_se(struct nci_dev *ndev, u8 se_idx,
 415                                    u8 state)
 416 {
 417         struct st_nci_info *info = nci_get_drvdata(ndev);
 418         int r;
 419         struct sk_buff *sk_host_list;
 420         u8 host_id;
 421
 422         switch (se_idx) {
 423         case ST_NCI_UICC_HOST_ID:
 424                 ndev->hci_dev->count_pipes = 0;
 425                 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_UICC;
 426                 break;
 427         case ST_NCI_ESE_HOST_ID:
 428                 ndev->hci_dev->count_pipes = 0;
 429                 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_EMBEDDED;
 430                 break;
 431         default:
 432                 return -EINVAL;
 433         }
 434
 435         /*
 436          * Wait for an EVT_HOT_PLUG in order to
 437          * retrieve a relevant host list.
 438          */
 439         reinit_completion(&info->se_info.req_completion);
 440         r = nci_nfcee_mode_set(ndev, se_idx, NCI_NFCEE_ENABLE);
 441         if (r != NCI_STATUS_OK)
 442                 return r;
 443
 444         mod_timer(&info->se_info.se_active_timer, jiffies +
 445                 msecs_to_jiffies(ST_NCI_SE_TO_HOT_PLUG));
 446         info->se_info.se_active = true;
 447
 448         /* Ignore return value and check in any case the host_list */
 449         wait_for_completion_interruptible(&info->se_info.req_completion);
 450
 451         /* There might be some "collision" after receiving a HOT_PLUG event
 452          * This may cause the CLF to not answer to the next hci command.
 453          * There is no possible synchronization to prevent this.
 454          * Adding a small delay is the only way to solve the issue.
 455          */
 456         usleep_range(3000, 5000);
 457
 458         r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 459                         NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
 460         if (r != NCI_HCI_ANY_OK)
 461                 return r;
 462
 463         host_id = sk_host_list->data[sk_host_list->len - 1];
 464         kfree_skb(sk_host_list);
 465         if (state == ST_NCI_SE_MODE_ON && host_id == se_idx)
 466                 return se_idx;
 467         else if (state == ST_NCI_SE_MODE_OFF && host_id != se_idx)
 468                 return se_idx;
 469
 470         return -1;
 471 }
 472
 473 int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
 474 {
 475         int r;
 476
 477         pr_debug("st_nci_disable_se\n");
 478
 479         if (se_idx == NFC_SE_EMBEDDED) {
 480                 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 481                                 ST_NCI_EVT_SE_END_OF_APDU_TRANSFER, NULL, 0);
 482                 if (r < 0)
 483                         return r;
 484         }
 485
 486         return 0;
 487 }
 488 EXPORT_SYMBOL_GPL(st_nci_disable_se);
 489
 490 int st_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
 491 {
 492         int r;
 493
 494         pr_debug("st_nci_enable_se\n");
 495
 496         if (se_idx == ST_NCI_HCI_HOST_ID_ESE) {
 497                 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 498                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 499                 if (r < 0)
 500                         return r;
 501         }
 502
 503         return 0;
 504 }
 505 EXPORT_SYMBOL_GPL(st_nci_enable_se);
 506
 507 static int st_nci_hci_network_init(struct nci_dev *ndev)
 508 {
 509         struct core_conn_create_dest_spec_params *dest_params;
 510         struct dest_spec_params spec_params;
 511         struct nci_conn_info    *conn_info;
 512         int r, dev_num;
 513
 514         dest_params =
 515                 kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
 516                         sizeof(struct dest_spec_params), GFP_KERNEL);
 517         if (dest_params == NULL) {
 518                 r = -ENOMEM;
 519                 goto exit;
 520         }
 521
 522         dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
 523         dest_params->length = sizeof(struct dest_spec_params);
 524         spec_params.id = ndev->hci_dev->nfcee_id;
 525         spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
 526         memcpy(dest_params->value, &spec_params,
 527                sizeof(struct dest_spec_params));
 528         r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
 529                                  sizeof(struct core_conn_create_dest_spec_params) +
 530                                  sizeof(struct dest_spec_params),
 531                                  dest_params);
 532         if (r != NCI_STATUS_OK)
 533                 goto free_dest_params;
 534
 535         conn_info = ndev->hci_dev->conn_info;
 536         if (!conn_info)
 537                 goto free_dest_params;
 538
 539         memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
 540                sizeof(st_nci_gates));
 541
 542         /*
 543          * Session id must include the driver name + i2c bus addr
 544          * persistent info to discriminate 2 identical chips
 545          */
 546         dev_num = find_first_zero_bit(dev_mask, ST_NCI_NUM_DEVICES);
 547         if (dev_num >= ST_NCI_NUM_DEVICES) {
 548                 r = -ENODEV;
 549                 goto free_dest_params;
 550         }
 551
 552         scnprintf(ndev->hci_dev->init_data.session_id,
 553                   sizeof(ndev->hci_dev->init_data.session_id),
 554                   "%s%2x", "ST21BH", dev_num);
 555
 556         r = nci_hci_dev_session_init(ndev);
 557         if (r != NCI_HCI_ANY_OK)
 558                 goto free_dest_params;
 559
 560         r = nci_nfcee_mode_set(ndev, ndev->hci_dev->conn_info->id,
 561                                NCI_NFCEE_ENABLE);
 562         if (r != NCI_STATUS_OK)
 563                 goto free_dest_params;
 564
 565 free_dest_params:
 566         kfree(dest_params);
 567
 568 exit:
 569         return r;
 570 }
 571
 572 int st_nci_discover_se(struct nci_dev *ndev)
 573 {
 574         u8 param[2];
 575         int r;
 576         int se_count = 0;
 577
 578         pr_debug("st_nci_discover_se\n");
 579
 580         r = st_nci_hci_network_init(ndev);
 581         if (r != 0)
 582                 return r;
 583
 584         param[0] = ST_NCI_UICC_HOST_ID;
 585         param[1] = ST_NCI_HCI_HOST_ID_ESE;
 586         r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 587                                 NCI_HCI_ADMIN_PARAM_WHITELIST,
 588                                 param, sizeof(param));
 589         if (r != NCI_HCI_ANY_OK)
 590                 return r;
 591
 592         r = st_nci_control_se(ndev, ST_NCI_UICC_HOST_ID,
 593                                 ST_NCI_SE_MODE_ON);
 594         if (r == ST_NCI_UICC_HOST_ID) {
 595                 nfc_add_se(ndev->nfc_dev, ST_NCI_UICC_HOST_ID, NFC_SE_UICC);
 596                 se_count++;
 597         }
 598
 599         /* Try to enable eSE in order to check availability */
 600         r = st_nci_control_se(ndev, ST_NCI_HCI_HOST_ID_ESE,
 601                                 ST_NCI_SE_MODE_ON);
 602         if (r == ST_NCI_HCI_HOST_ID_ESE) {
 603                 nfc_add_se(ndev->nfc_dev, ST_NCI_HCI_HOST_ID_ESE,
 604                            NFC_SE_EMBEDDED);
 605                 se_count++;
 606                 st_nci_se_get_atr(ndev);
 607         }
 608
 609         return !se_count;
 610 }
 611 EXPORT_SYMBOL_GPL(st_nci_discover_se);
 612
 613 int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
 614                        u8 *apdu, size_t apdu_length,
 615                        se_io_cb_t cb, void *cb_context)
 616 {
 617         struct st_nci_info *info = nci_get_drvdata(ndev);
 618
 619         pr_debug("\n");
 620
 621         switch (se_idx) {
 622         case ST_NCI_HCI_HOST_ID_ESE:
 623                 info->se_info.cb = cb;
 624                 info->se_info.cb_context = cb_context;
 625                 mod_timer(&info->se_info.bwi_timer, jiffies +
 626                           msecs_to_jiffies(info->se_info.wt_timeout));
 627                 info->se_info.bwi_active = true;
 628                 return nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 629                                         ST_NCI_EVT_TRANSMIT_DATA, apdu,
 630                                         apdu_length);
 631         default:
 632                 return -ENODEV;
 633         }
 634 }
 635 EXPORT_SYMBOL(st_nci_se_io);
 636
 637 static void st_nci_se_wt_timeout(unsigned long data)
 638 {
 639         /*
 640          * No answer from the secure element
 641          * within the defined timeout.
 642          * Let's send a reset request as recovery procedure.
 643          * According to the situation, we first try to send a software reset
 644          * to the secure element. If the next command is still not
 645          * answering in time, we send to the CLF a secure element hardware
 646          * reset request.
 647          */
 648         /* hardware reset managed through VCC_UICC_OUT power supply */
 649         u8 param = 0x01;
 650         struct st_nci_info *info = (struct st_nci_info *) data;
 651
 652         pr_debug("\n");
 653
 654         info->se_info.bwi_active = false;
 655
 656         if (!info->se_info.xch_error) {
 657                 info->se_info.xch_error = true;
 658                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_APDU_READER_GATE,
 659                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 660         } else {
 661                 info->se_info.xch_error = false;
 662                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_DEVICE_MGNT_GATE,
 663                                 ST_NCI_EVT_SE_HARD_RESET, &param, 1);
 664         }
 665         info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
 666 }
 667
 668 static void st_nci_se_activation_timeout(unsigned long data)
 669 {
 670         struct st_nci_info *info = (struct st_nci_info *) data;
 671
 672         pr_debug("\n");
 673
 674         info->se_info.se_active = false;
 675
 676         complete(&info->se_info.req_completion);
 677 }
 678
 679 int st_nci_se_init(struct nci_dev *ndev)
 680 {
 681         struct st_nci_info *info = nci_get_drvdata(ndev);
 682
 683         init_completion(&info->se_info.req_completion);
 684         /* initialize timers */
 685         init_timer(&info->se_info.bwi_timer);
 686         info->se_info.bwi_timer.data = (unsigned long)info;
 687         info->se_info.bwi_timer.function = st_nci_se_wt_timeout;
 688         info->se_info.bwi_active = false;
 689
 690         init_timer(&info->se_info.se_active_timer);
 691         info->se_info.se_active_timer.data = (unsigned long)info;
 692         info->se_info.se_active_timer.function =
 693                         st_nci_se_activation_timeout;
 694         info->se_info.se_active = false;
 695
 696         info->se_info.xch_error = false;
 697
 698         info->se_info.wt_timeout =
 699                 ST_NCI_BWI_TO_TIMEOUT(ST_NCI_ATR_DEFAULT_BWI);
 700
 701         return 0;
 702 }
 703 EXPORT_SYMBOL(st_nci_se_init);
 704
 705 void st_nci_se_deinit(struct nci_dev *ndev)
 706 {
 707         struct st_nci_info *info = nci_get_drvdata(ndev);
 708
 709         if (info->se_info.bwi_active)
 710                 del_timer_sync(&info->se_info.bwi_timer);
 711         if (info->se_info.se_active)
 712                 del_timer_sync(&info->se_info.se_active_timer);
 713
 714         info->se_info.se_active = false;
 715         info->se_info.bwi_active = false;
 716 }
 717 EXPORT_SYMBOL(st_nci_se_deinit);
 718