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_APDU_READER_GATE       0xf0
  43 #define ST_NCI_CONNECTIVITY_GATE      0x41
  44
  45 /* Pipes */
  46 #define ST_NCI_DEVICE_MGNT_PIPE               0x02
  47
  48 /* Connectivity pipe only */
  49 #define ST_NCI_SE_COUNT_PIPE_UICC             0x01
  50 /* Connectivity + APDU Reader pipe */
  51 #define ST_NCI_SE_COUNT_PIPE_EMBEDDED         0x02
  52
  53 #define ST_NCI_SE_TO_HOT_PLUG                   1000 /* msecs */
  54 #define ST_NCI_SE_TO_PIPES                      2000
  55
  56 #define ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(x)   (x->data[0] & 0x80)
  57
  58 #define NCI_HCI_APDU_PARAM_ATR                     0x01
  59 #define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY       0x01
  60 #define NCI_HCI_ADMIN_PARAM_WHITELIST              0x03
  61 #define NCI_HCI_ADMIN_PARAM_HOST_LIST              0x04
  62
  63 #define ST_NCI_EVT_SE_HARD_RESET                0x20
  64 #define ST_NCI_EVT_TRANSMIT_DATA                0x10
  65 #define ST_NCI_EVT_WTX_REQUEST          0x11
  66 #define ST_NCI_EVT_SE_SOFT_RESET                0x11
  67 #define ST_NCI_EVT_SE_END_OF_APDU_TRANSFER      0x21
  68 #define ST_NCI_EVT_HOT_PLUG                     0x03
  69
  70 #define ST_NCI_SE_MODE_OFF                    0x00
  71 #define ST_NCI_SE_MODE_ON                     0x01
  72
  73 #define ST_NCI_EVT_CONNECTIVITY       0x10
  74 #define ST_NCI_EVT_TRANSACTION        0x12
  75
  76 #define ST_NCI_DM_GETINFO             0x13
  77 #define ST_NCI_DM_GETINFO_PIPE_LIST   0x02
  78 #define ST_NCI_DM_GETINFO_PIPE_INFO   0x01
  79 #define ST_NCI_DM_PIPE_CREATED        0x02
  80 #define ST_NCI_DM_PIPE_OPEN           0x04
  81 #define ST_NCI_DM_RF_ACTIVE           0x80
  82 #define ST_NCI_DM_DISCONNECT          0x30
  83
  84 #define ST_NCI_DM_IS_PIPE_OPEN(p) \
  85         ((p & 0x0f) == (ST_NCI_DM_PIPE_CREATED | ST_NCI_DM_PIPE_OPEN))
  86
  87 #define ST_NCI_ATR_DEFAULT_BWI        0x04
  88
  89 /*
  90  * WT = 2^BWI/10[s], convert into msecs and add a secure
  91  * room by increasing by 2 this timeout
  92  */
  93 #define ST_NCI_BWI_TO_TIMEOUT(x)      ((1 << x) * 200)
  94 #define ST_NCI_ATR_GET_Y_FROM_TD(x)   (x >> 4)
  95
  96 /* If TA is present bit 0 is set */
  97 #define ST_NCI_ATR_TA_PRESENT(x) (x & 0x01)
  98 /* If TB is present bit 1 is set */
  99 #define ST_NCI_ATR_TB_PRESENT(x) (x & 0x02)
 100
 101 #define ST_NCI_NUM_DEVICES           256
 102
 103 static DECLARE_BITMAP(dev_mask, ST_NCI_NUM_DEVICES);
 104
 105 /* Here are the mandatory pipe for st_nci */
 106 static struct nci_hci_gate st_nci_gates[] = {
 107         {NCI_HCI_ADMIN_GATE, NCI_HCI_ADMIN_PIPE,
 108                                         ST_NCI_HOST_CONTROLLER_ID},
 109         {NCI_HCI_LINK_MGMT_GATE, NCI_HCI_LINK_MGMT_PIPE,
 110                                         ST_NCI_HOST_CONTROLLER_ID},
 111         {ST_NCI_DEVICE_MGNT_GATE, ST_NCI_DEVICE_MGNT_PIPE,
 112                                         ST_NCI_HOST_CONTROLLER_ID},
 113
 114         {NCI_HCI_IDENTITY_MGMT_GATE, NCI_HCI_INVALID_PIPE,
 115                                         ST_NCI_HOST_CONTROLLER_ID},
 116         {NCI_HCI_LOOPBACK_GATE, NCI_HCI_INVALID_PIPE,
 117                                         ST_NCI_HOST_CONTROLLER_ID},
 118
 119         /* Secure element pipes are created by secure element host */
 120         {ST_NCI_CONNECTIVITY_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
 121                                         ST_NCI_HOST_CONTROLLER_ID},
 122         {ST_NCI_APDU_READER_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
 123                                         ST_NCI_HOST_CONTROLLER_ID},
 124 };
 125
 126 static u8 st_nci_se_get_bwi(struct nci_dev *ndev)
 127 {
 128         int i;
 129         u8 td;
 130         struct st_nci_info *info = nci_get_drvdata(ndev);
 131
 132         /* Bits 8 to 5 of the first TB for T=1 encode BWI from zero to nine */
 133         for (i = 1; i < ST_NCI_ESE_MAX_LENGTH; i++) {
 134                 td = ST_NCI_ATR_GET_Y_FROM_TD(info->se_info.atr[i]);
 135                 if (ST_NCI_ATR_TA_PRESENT(td))
 136                         i++;
 137                 if (ST_NCI_ATR_TB_PRESENT(td)) {
 138                         i++;
 139                         return info->se_info.atr[i] >> 4;
 140                 }
 141         }
 142         return ST_NCI_ATR_DEFAULT_BWI;
 143 }
 144
 145 static void st_nci_se_get_atr(struct nci_dev *ndev)
 146 {
 147         struct st_nci_info *info = nci_get_drvdata(ndev);
 148         int r;
 149         struct sk_buff *skb;
 150
 151         r = nci_hci_get_param(ndev, ST_NCI_APDU_READER_GATE,
 152                                 NCI_HCI_APDU_PARAM_ATR, &skb);
 153         if (r < 0)
 154                 return;
 155
 156         if (skb->len <= ST_NCI_ESE_MAX_LENGTH) {
 157                 memcpy(info->se_info.atr, skb->data, skb->len);
 158
 159                 info->se_info.wt_timeout =
 160                         ST_NCI_BWI_TO_TIMEOUT(st_nci_se_get_bwi(ndev));
 161         }
 162         kfree_skb(skb);
 163 }
 164
 165 int st_nci_hci_load_session(struct nci_dev *ndev)
 166 {
 167         int i, j, r;
 168         struct sk_buff *skb_pipe_list, *skb_pipe_info;
 169         struct st_nci_pipe_info *dm_pipe_info;
 170         u8 pipe_list[] = { ST_NCI_DM_GETINFO_PIPE_LIST,
 171                         ST_NCI_TERMINAL_HOST_ID};
 172         u8 pipe_info[] = { ST_NCI_DM_GETINFO_PIPE_INFO,
 173                         ST_NCI_TERMINAL_HOST_ID, 0};
 174
 175         /* On ST_NCI device pipes number are dynamics
 176          * If pipes are already created, hci_dev_up will fail.
 177          * Doing a clear all pipe is a bad idea because:
 178          * - It does useless EEPROM cycling
 179          * - It might cause issue for secure elements support
 180          * (such as removing connectivity or APDU reader pipe)
 181          * A better approach on ST_NCI is to:
 182          * - get a pipe list for each host.
 183          * (eg: ST_NCI_HOST_CONTROLLER_ID for now).
 184          * (TODO Later on UICC HOST and eSE HOST)
 185          * - get pipe information
 186          * - match retrieved pipe list in st_nci_gates
 187          * ST_NCI_DEVICE_MGNT_GATE is a proprietary gate
 188          * with ST_NCI_DEVICE_MGNT_PIPE.
 189          * Pipe can be closed and need to be open.
 190          */
 191         r = nci_hci_connect_gate(ndev, ST_NCI_HOST_CONTROLLER_ID,
 192                                 ST_NCI_DEVICE_MGNT_GATE,
 193                                 ST_NCI_DEVICE_MGNT_PIPE);
 194         if (r < 0)
 195                 return r;
 196
 197         /* Get pipe list */
 198         r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
 199                         ST_NCI_DM_GETINFO, pipe_list, sizeof(pipe_list),
 200                         &skb_pipe_list);
 201         if (r < 0)
 202                 return r;
 203
 204         /* Complete the existing gate_pipe table */
 205         for (i = 0; i < skb_pipe_list->len; i++) {
 206                 pipe_info[2] = skb_pipe_list->data[i];
 207                 r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
 208                                         ST_NCI_DM_GETINFO, pipe_info,
 209                                         sizeof(pipe_info), &skb_pipe_info);
 210
 211                 if (r)
 212                         continue;
 213
 214                 /*
 215                  * Match pipe ID and gate ID
 216                  * Output format from ST21NFC_DM_GETINFO is:
 217                  * - pipe state (1byte)
 218                  * - source hid (1byte)
 219                  * - source gid (1byte)
 220                  * - destination hid (1byte)
 221                  * - destination gid (1byte)
 222                  */
 223                 dm_pipe_info = (struct st_nci_pipe_info *)skb_pipe_info->data;
 224                 if (dm_pipe_info->dst_gate_id == ST_NCI_APDU_READER_GATE &&
 225                     dm_pipe_info->src_host_id != ST_NCI_ESE_HOST_ID) {
 226                         pr_err("Unexpected apdu_reader pipe on host %x\n",
 227                                dm_pipe_info->src_host_id);
 228                         kfree_skb(skb_pipe_info);
 229                         continue;
 230                 }
 231
 232                 for (j = 3; (j < ARRAY_SIZE(st_nci_gates)) &&
 233                      (st_nci_gates[j].gate != dm_pipe_info->dst_gate_id); j++)
 234                         ;
 235
 236                 if (j < ARRAY_SIZE(st_nci_gates) &&
 237                     st_nci_gates[j].gate == dm_pipe_info->dst_gate_id &&
 238                     ST_NCI_DM_IS_PIPE_OPEN(dm_pipe_info->pipe_state)) {
 239                         ndev->hci_dev->init_data.gates[j].pipe = pipe_info[2];
 240
 241                         ndev->hci_dev->gate2pipe[st_nci_gates[j].gate] =
 242                                                 pipe_info[2];
 243                         ndev->hci_dev->pipes[pipe_info[2]].gate =
 244                                                 st_nci_gates[j].gate;
 245                         ndev->hci_dev->pipes[pipe_info[2]].host =
 246                                                 dm_pipe_info->src_host_id;
 247                 }
 248                 kfree_skb(skb_pipe_info);
 249         }
 250
 251         /*
 252          * 3 gates have a well known pipe ID. Only NCI_HCI_LINK_MGMT_GATE
 253          * is not yet open at this stage.
 254          */
 255         r = nci_hci_connect_gate(ndev, ST_NCI_HOST_CONTROLLER_ID,
 256                                  NCI_HCI_LINK_MGMT_GATE,
 257                                  NCI_HCI_LINK_MGMT_PIPE);
 258
 259         kfree_skb(skb_pipe_list);
 260         return r;
 261 }
 262 EXPORT_SYMBOL_GPL(st_nci_hci_load_session);
 263
 264 static void st_nci_hci_admin_event_received(struct nci_dev *ndev,
 265                                               u8 event, struct sk_buff *skb)
 266 {
 267         struct st_nci_info *info = nci_get_drvdata(ndev);
 268
 269         switch (event) {
 270         case ST_NCI_EVT_HOT_PLUG:
 271                 if (info->se_info.se_active) {
 272                         if (!ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
 273                                 del_timer_sync(&info->se_info.se_active_timer);
 274                                 info->se_info.se_active = false;
 275                                 complete(&info->se_info.req_completion);
 276                         } else {
 277                                 mod_timer(&info->se_info.se_active_timer,
 278                                       jiffies +
 279                                       msecs_to_jiffies(ST_NCI_SE_TO_PIPES));
 280                         }
 281                 }
 282         break;
 283         }
 284 }
 285
 286 static int st_nci_hci_apdu_reader_event_received(struct nci_dev *ndev,
 287                                                    u8 event,
 288                                                    struct sk_buff *skb)
 289 {
 290         int r = 0;
 291         struct st_nci_info *info = nci_get_drvdata(ndev);
 292
 293         pr_debug("apdu reader gate event: %x\n", event);
 294
 295         switch (event) {
 296         case ST_NCI_EVT_TRANSMIT_DATA:
 297                 del_timer_sync(&info->se_info.bwi_timer);
 298                 info->se_info.bwi_active = false;
 299                 info->se_info.cb(info->se_info.cb_context,
 300                                  skb->data, skb->len, 0);
 301         break;
 302         case ST_NCI_EVT_WTX_REQUEST:
 303                 mod_timer(&info->se_info.bwi_timer, jiffies +
 304                           msecs_to_jiffies(info->se_info.wt_timeout));
 305         break;
 306         }
 307
 308         kfree_skb(skb);
 309         return r;
 310 }
 311
 312 /*
 313  * Returns:
 314  * <= 0: driver handled the event, skb consumed
 315  *    1: driver does not handle the event, please do standard processing
 316  */
 317 static int st_nci_hci_connectivity_event_received(struct nci_dev *ndev,
 318                                                 u8 host, u8 event,
 319                                                 struct sk_buff *skb)
 320 {
 321         int r = 0;
 322         struct device *dev = &ndev->nfc_dev->dev;
 323         struct nfc_evt_transaction *transaction;
 324
 325         pr_debug("connectivity gate event: %x\n", event);
 326
 327         switch (event) {
 328         case ST_NCI_EVT_CONNECTIVITY:
 329
 330         break;
 331         case ST_NCI_EVT_TRANSACTION:
 332                 /* According to specification etsi 102 622
 333                  * 11.2.2.4 EVT_TRANSACTION Table 52
 334                  * Description  Tag     Length
 335                  * AID          81      5 to 16
 336                  * PARAMETERS   82      0 to 255
 337                  */
 338                 if (skb->len < NFC_MIN_AID_LENGTH + 2 &&
 339                     skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)
 340                         return -EPROTO;
 341
 342                 transaction = (struct nfc_evt_transaction *)devm_kzalloc(dev,
 343                                             skb->len - 2, GFP_KERNEL);
 344
 345                 transaction->aid_len = skb->data[1];
 346                 memcpy(transaction->aid, &skb->data[2], transaction->aid_len);
 347
 348                 /* Check next byte is PARAMETERS tag (82) */
 349                 if (skb->data[transaction->aid_len + 2] !=
 350                     NFC_EVT_TRANSACTION_PARAMS_TAG)
 351                         return -EPROTO;
 352
 353                 transaction->params_len = skb->data[transaction->aid_len + 3];
 354                 memcpy(transaction->params, skb->data +
 355                        transaction->aid_len + 4, transaction->params_len);
 356
 357                 r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
 358                 break;
 359         default:
 360                 return 1;
 361         }
 362         kfree_skb(skb);
 363         return r;
 364 }
 365
 366 void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
 367                                  u8 event, struct sk_buff *skb)
 368 {
 369         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 370         u8 host = ndev->hci_dev->pipes[pipe].host;
 371
 372         switch (gate) {
 373         case NCI_HCI_ADMIN_GATE:
 374                 st_nci_hci_admin_event_received(ndev, event, skb);
 375         break;
 376         case ST_NCI_APDU_READER_GATE:
 377                 st_nci_hci_apdu_reader_event_received(ndev, event, skb);
 378         break;
 379         case ST_NCI_CONNECTIVITY_GATE:
 380                 st_nci_hci_connectivity_event_received(ndev, host, event, skb);
 381         break;
 382         case NCI_HCI_LOOPBACK_GATE:
 383                 st_nci_hci_loopback_event_received(ndev, event, skb);
 384         break;
 385         }
 386 }
 387 EXPORT_SYMBOL_GPL(st_nci_hci_event_received);
 388
 389
 390 void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
 391                                struct sk_buff *skb)
 392 {
 393         struct st_nci_info *info = nci_get_drvdata(ndev);
 394         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 395
 396         pr_debug("cmd: %x\n", cmd);
 397
 398         switch (cmd) {
 399         case NCI_HCI_ANY_OPEN_PIPE:
 400                 if (gate != ST_NCI_APDU_READER_GATE &&
 401                     ndev->hci_dev->pipes[pipe].host != ST_NCI_UICC_HOST_ID)
 402                         ndev->hci_dev->count_pipes++;
 403
 404                 if (ndev->hci_dev->count_pipes ==
 405                     ndev->hci_dev->expected_pipes) {
 406                         del_timer_sync(&info->se_info.se_active_timer);
 407                         info->se_info.se_active = false;
 408                         ndev->hci_dev->count_pipes = 0;
 409                         complete(&info->se_info.req_completion);
 410                 }
 411         break;
 412         }
 413 }
 414 EXPORT_SYMBOL_GPL(st_nci_hci_cmd_received);
 415
 416 /*
 417  * Remarks: On some early st_nci firmware, nci_nfcee_mode_set(0)
 418  * is rejected
 419  */
 420 static int st_nci_control_se(struct nci_dev *ndev, u8 se_idx,
 421                                    u8 state)
 422 {
 423         struct st_nci_info *info = nci_get_drvdata(ndev);
 424         int r;
 425         struct sk_buff *sk_host_list;
 426         u8 host_id;
 427
 428         switch (se_idx) {
 429         case ST_NCI_UICC_HOST_ID:
 430                 ndev->hci_dev->count_pipes = 0;
 431                 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_UICC;
 432                 break;
 433         case ST_NCI_ESE_HOST_ID:
 434                 ndev->hci_dev->count_pipes = 0;
 435                 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_EMBEDDED;
 436                 break;
 437         default:
 438                 return -EINVAL;
 439         }
 440
 441         /*
 442          * Wait for an EVT_HOT_PLUG in order to
 443          * retrieve a relevant host list.
 444          */
 445         reinit_completion(&info->se_info.req_completion);
 446         r = nci_nfcee_mode_set(ndev, se_idx, NCI_NFCEE_ENABLE);
 447         if (r != NCI_STATUS_OK)
 448                 return r;
 449
 450         mod_timer(&info->se_info.se_active_timer, jiffies +
 451                 msecs_to_jiffies(ST_NCI_SE_TO_HOT_PLUG));
 452         info->se_info.se_active = true;
 453
 454         /* Ignore return value and check in any case the host_list */
 455         wait_for_completion_interruptible(&info->se_info.req_completion);
 456
 457         /* There might be some "collision" after receiving a HOT_PLUG event
 458          * This may cause the CLF to not answer to the next hci command.
 459          * There is no possible synchronization to prevent this.
 460          * Adding a small delay is the only way to solve the issue.
 461          */
 462         usleep_range(3000, 5000);
 463
 464         r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 465                         NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
 466         if (r != NCI_HCI_ANY_OK)
 467                 return r;
 468
 469         host_id = sk_host_list->data[sk_host_list->len - 1];
 470         kfree_skb(sk_host_list);
 471         if (state == ST_NCI_SE_MODE_ON && host_id == se_idx)
 472                 return se_idx;
 473         else if (state == ST_NCI_SE_MODE_OFF && host_id != se_idx)
 474                 return se_idx;
 475
 476         return -1;
 477 }
 478
 479 int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
 480 {
 481         int r;
 482
 483         pr_debug("st_nci_disable_se\n");
 484
 485         if (se_idx == NFC_SE_EMBEDDED) {
 486                 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 487                                 ST_NCI_EVT_SE_END_OF_APDU_TRANSFER, NULL, 0);
 488                 if (r < 0)
 489                         return r;
 490         }
 491
 492         return 0;
 493 }
 494 EXPORT_SYMBOL_GPL(st_nci_disable_se);
 495
 496 int st_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
 497 {
 498         int r;
 499
 500         pr_debug("st_nci_enable_se\n");
 501
 502         if (se_idx == ST_NCI_HCI_HOST_ID_ESE) {
 503                 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 504                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 505                 if (r < 0)
 506                         return r;
 507         }
 508
 509         return 0;
 510 }
 511 EXPORT_SYMBOL_GPL(st_nci_enable_se);
 512
 513 static int st_nci_hci_network_init(struct nci_dev *ndev)
 514 {
 515         struct st_nci_info *info = nci_get_drvdata(ndev);
 516         struct core_conn_create_dest_spec_params *dest_params;
 517         struct dest_spec_params spec_params;
 518         struct nci_conn_info    *conn_info;
 519         int r, dev_num;
 520
 521         dest_params =
 522                 kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
 523                         sizeof(struct dest_spec_params), GFP_KERNEL);
 524         if (dest_params == NULL) {
 525                 r = -ENOMEM;
 526                 goto exit;
 527         }
 528
 529         dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
 530         dest_params->length = sizeof(struct dest_spec_params);
 531         spec_params.id = ndev->hci_dev->nfcee_id;
 532         spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
 533         memcpy(dest_params->value, &spec_params,
 534                sizeof(struct dest_spec_params));
 535         r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
 536                                  sizeof(struct core_conn_create_dest_spec_params) +
 537                                  sizeof(struct dest_spec_params),
 538                                  dest_params);
 539         if (r != NCI_STATUS_OK)
 540                 goto free_dest_params;
 541
 542         conn_info = ndev->hci_dev->conn_info;
 543         if (!conn_info)
 544                 goto free_dest_params;
 545
 546         ndev->hci_dev->init_data.gate_count = ARRAY_SIZE(st_nci_gates);
 547         memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
 548                sizeof(st_nci_gates));
 549
 550         /*
 551          * Session id must include the driver name + i2c bus addr
 552          * persistent info to discriminate 2 identical chips
 553          */
 554         dev_num = find_first_zero_bit(dev_mask, ST_NCI_NUM_DEVICES);
 555         if (dev_num >= ST_NCI_NUM_DEVICES) {
 556                 r = -ENODEV;
 557                 goto free_dest_params;
 558         }
 559
 560         scnprintf(ndev->hci_dev->init_data.session_id,
 561                   sizeof(ndev->hci_dev->init_data.session_id),
 562                   "%s%2x", "ST21BH", dev_num);
 563
 564         r = nci_hci_dev_session_init(ndev);
 565         if (r != NCI_HCI_ANY_OK)
 566                 goto free_dest_params;
 567
 568         /*
 569          * In factory mode, we prevent secure elements activation
 570          * by disabling nfcee on the current HCI connection id.
 571          * HCI will be used here only for proprietary commands.
 572          */
 573         if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
 574                 r = nci_nfcee_mode_set(ndev, ndev->hci_dev->conn_info->id,
 575                                        NCI_NFCEE_DISABLE);
 576         else
 577                 r = nci_nfcee_mode_set(ndev, ndev->hci_dev->conn_info->id,
 578                                        NCI_NFCEE_ENABLE);
 579
 580 free_dest_params:
 581         kfree(dest_params);
 582
 583 exit:
 584         return r;
 585 }
 586
 587 int st_nci_discover_se(struct nci_dev *ndev)
 588 {
 589         u8 param[2];
 590         int r;
 591         int se_count = 0;
 592         struct st_nci_info *info = nci_get_drvdata(ndev);
 593
 594         pr_debug("st_nci_discover_se\n");
 595
 596         r = st_nci_hci_network_init(ndev);
 597         if (r != 0)
 598                 return r;
 599
 600         if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
 601                 return 0;
 602
 603         param[0] = ST_NCI_UICC_HOST_ID;
 604         param[1] = ST_NCI_HCI_HOST_ID_ESE;
 605         r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 606                                 NCI_HCI_ADMIN_PARAM_WHITELIST,
 607                                 param, sizeof(param));
 608         if (r != NCI_HCI_ANY_OK)
 609                 return r;
 610
 611         r = st_nci_control_se(ndev, ST_NCI_UICC_HOST_ID,
 612                                 ST_NCI_SE_MODE_ON);
 613         if (r == ST_NCI_UICC_HOST_ID) {
 614                 nfc_add_se(ndev->nfc_dev, ST_NCI_UICC_HOST_ID, NFC_SE_UICC);
 615                 se_count++;
 616         }
 617
 618         /* Try to enable eSE in order to check availability */
 619         r = st_nci_control_se(ndev, ST_NCI_HCI_HOST_ID_ESE,
 620                                 ST_NCI_SE_MODE_ON);
 621         if (r == ST_NCI_HCI_HOST_ID_ESE) {
 622                 nfc_add_se(ndev->nfc_dev, ST_NCI_HCI_HOST_ID_ESE,
 623                            NFC_SE_EMBEDDED);
 624                 se_count++;
 625                 st_nci_se_get_atr(ndev);
 626         }
 627
 628         return !se_count;
 629 }
 630 EXPORT_SYMBOL_GPL(st_nci_discover_se);
 631
 632 int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
 633                        u8 *apdu, size_t apdu_length,
 634                        se_io_cb_t cb, void *cb_context)
 635 {
 636         struct st_nci_info *info = nci_get_drvdata(ndev);
 637
 638         pr_debug("\n");
 639
 640         switch (se_idx) {
 641         case ST_NCI_HCI_HOST_ID_ESE:
 642                 info->se_info.cb = cb;
 643                 info->se_info.cb_context = cb_context;
 644                 mod_timer(&info->se_info.bwi_timer, jiffies +
 645                           msecs_to_jiffies(info->se_info.wt_timeout));
 646                 info->se_info.bwi_active = true;
 647                 return nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 648                                         ST_NCI_EVT_TRANSMIT_DATA, apdu,
 649                                         apdu_length);
 650         default:
 651                 return -ENODEV;
 652         }
 653 }
 654 EXPORT_SYMBOL(st_nci_se_io);
 655
 656 static void st_nci_se_wt_timeout(unsigned long data)
 657 {
 658         /*
 659          * No answer from the secure element
 660          * within the defined timeout.
 661          * Let's send a reset request as recovery procedure.
 662          * According to the situation, we first try to send a software reset
 663          * to the secure element. If the next command is still not
 664          * answering in time, we send to the CLF a secure element hardware
 665          * reset request.
 666          */
 667         /* hardware reset managed through VCC_UICC_OUT power supply */
 668         u8 param = 0x01;
 669         struct st_nci_info *info = (struct st_nci_info *) data;
 670
 671         pr_debug("\n");
 672
 673         info->se_info.bwi_active = false;
 674
 675         if (!info->se_info.xch_error) {
 676                 info->se_info.xch_error = true;
 677                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_APDU_READER_GATE,
 678                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 679         } else {
 680                 info->se_info.xch_error = false;
 681                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_DEVICE_MGNT_GATE,
 682                                 ST_NCI_EVT_SE_HARD_RESET, &param, 1);
 683         }
 684         info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
 685 }
 686
 687 static void st_nci_se_activation_timeout(unsigned long data)
 688 {
 689         struct st_nci_info *info = (struct st_nci_info *) data;
 690
 691         pr_debug("\n");
 692
 693         info->se_info.se_active = false;
 694
 695         complete(&info->se_info.req_completion);
 696 }
 697
 698 int st_nci_se_init(struct nci_dev *ndev)
 699 {
 700         struct st_nci_info *info = nci_get_drvdata(ndev);
 701
 702         init_completion(&info->se_info.req_completion);
 703         /* initialize timers */
 704         init_timer(&info->se_info.bwi_timer);
 705         info->se_info.bwi_timer.data = (unsigned long)info;
 706         info->se_info.bwi_timer.function = st_nci_se_wt_timeout;
 707         info->se_info.bwi_active = false;
 708
 709         init_timer(&info->se_info.se_active_timer);
 710         info->se_info.se_active_timer.data = (unsigned long)info;
 711         info->se_info.se_active_timer.function =
 712                         st_nci_se_activation_timeout;
 713         info->se_info.se_active = false;
 714
 715         info->se_info.xch_error = false;
 716
 717         info->se_info.wt_timeout =
 718                 ST_NCI_BWI_TO_TIMEOUT(ST_NCI_ATR_DEFAULT_BWI);
 719
 720         return 0;
 721 }
 722 EXPORT_SYMBOL(st_nci_se_init);
 723
 724 void st_nci_se_deinit(struct nci_dev *ndev)
 725 {
 726         struct st_nci_info *info = nci_get_drvdata(ndev);
 727
 728         if (info->se_info.bwi_active)
 729                 del_timer_sync(&info->se_info.bwi_timer);
 730         if (info->se_info.se_active)
 731                 del_timer_sync(&info->se_info.se_active_timer);
 732
 733         info->se_info.se_active = false;
 734         info->se_info.bwi_active = false;
 735 }
 736 EXPORT_SYMBOL(st_nci_se_deinit);
 737