drivers/nfc/st21nfcb/st21nfcb_se.c

   1 /*
   2  * NCI based Driver for STMicroelectronics NFC Chip
   3  *
   4  * Copyright (C) 2014  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 "st21nfcb.h"
  26 #include "st21nfcb_se.h"
  27
  28 struct st21nfcb_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 ST21NFCB_HOST_CONTROLLER_ID     0x00
  38 #define ST21NFCB_TERMINAL_HOST_ID       0x01
  39 #define ST21NFCB_UICC_HOST_ID           0x02
  40 #define ST21NFCB_ESE_HOST_ID            0xc0
  41
  42 /* Gates */
  43 #define ST21NFCB_DEVICE_MGNT_GATE       0x01
  44 #define ST21NFCB_APDU_READER_GATE       0xf0
  45 #define ST21NFCB_CONNECTIVITY_GATE      0x41
  46
  47 /* Pipes */
  48 #define ST21NFCB_DEVICE_MGNT_PIPE               0x02
  49
  50 /* Connectivity pipe only */
  51 #define ST21NFCB_SE_COUNT_PIPE_UICC             0x01
  52 /* Connectivity + APDU Reader pipe */
  53 #define ST21NFCB_SE_COUNT_PIPE_EMBEDDED         0x02
  54
  55 #define ST21NFCB_SE_TO_HOT_PLUG                 1000 /* msecs */
  56 #define ST21NFCB_SE_TO_PIPES                    2000
  57
  58 #define ST21NFCB_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 ST21NFCB_EVT_SE_HARD_RESET              0x20
  66 #define ST21NFCB_EVT_TRANSMIT_DATA              0x10
  67 #define ST21NFCB_EVT_WTX_REQUEST                0x11
  68 #define ST21NFCB_EVT_SE_SOFT_RESET              0x11
  69 #define ST21NFCB_EVT_SE_END_OF_APDU_TRANSFER    0x21
  70 #define ST21NFCB_EVT_HOT_PLUG                   0x03
  71
  72 #define ST21NFCB_SE_MODE_OFF                    0x00
  73 #define ST21NFCB_SE_MODE_ON                     0x01
  74
  75 #define ST21NFCB_EVT_CONNECTIVITY       0x10
  76 #define ST21NFCB_EVT_TRANSACTION        0x12
  77
  78 #define ST21NFCB_DM_GETINFO             0x13
  79 #define ST21NFCB_DM_GETINFO_PIPE_LIST   0x02
  80 #define ST21NFCB_DM_GETINFO_PIPE_INFO   0x01
  81 #define ST21NFCB_DM_PIPE_CREATED        0x02
  82 #define ST21NFCB_DM_PIPE_OPEN           0x04
  83 #define ST21NFCB_DM_RF_ACTIVE           0x80
  84 #define ST21NFCB_DM_DISCONNECT          0x30
  85
  86 #define ST21NFCB_DM_IS_PIPE_OPEN(p) \
  87         ((p & 0x0f) == (ST21NFCB_DM_PIPE_CREATED | ST21NFCB_DM_PIPE_OPEN))
  88
  89 #define ST21NFCB_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 ST21NFCB_BWI_TO_TIMEOUT(x)      ((1 << x) * 200)
  96 #define ST21NFCB_ATR_GET_Y_FROM_TD(x)   (x >> 4)
  97
  98 /* If TA is present bit 0 is set */
  99 #define ST21NFCB_ATR_TA_PRESENT(x) (x & 0x01)
 100 /* If TB is present bit 1 is set */
 101 #define ST21NFCB_ATR_TB_PRESENT(x) (x & 0x02)
 102
 103 #define ST21NFCB_NUM_DEVICES           256
 104
 105 static DECLARE_BITMAP(dev_mask, ST21NFCB_NUM_DEVICES);
 106
 107 /* Here are the mandatory pipe for st21nfcb */
 108 static struct nci_hci_gate st21nfcb_gates[] = {
 109         {NCI_HCI_ADMIN_GATE, NCI_HCI_ADMIN_PIPE,
 110                                         ST21NFCB_HOST_CONTROLLER_ID},
 111         {NCI_HCI_LINK_MGMT_GATE, NCI_HCI_LINK_MGMT_PIPE,
 112                                         ST21NFCB_HOST_CONTROLLER_ID},
 113         {ST21NFCB_DEVICE_MGNT_GATE, ST21NFCB_DEVICE_MGNT_PIPE,
 114                                         ST21NFCB_HOST_CONTROLLER_ID},
 115
 116         /* Secure element pipes are created by secure element host */
 117         {ST21NFCB_CONNECTIVITY_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
 118                                         ST21NFCB_HOST_CONTROLLER_ID},
 119         {ST21NFCB_APDU_READER_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
 120                                         ST21NFCB_HOST_CONTROLLER_ID},
 121 };
 122
 123 static u8 st21nfcb_se_get_bwi(struct nci_dev *ndev)
 124 {
 125         int i;
 126         u8 td;
 127         struct st21nfcb_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 < ST21NFCB_ESE_MAX_LENGTH; i++) {
 131                 td = ST21NFCB_ATR_GET_Y_FROM_TD(info->se_info.atr[i]);
 132                 if (ST21NFCB_ATR_TA_PRESENT(td))
 133                         i++;
 134                 if (ST21NFCB_ATR_TB_PRESENT(td)) {
 135                         i++;
 136                         return info->se_info.atr[i] >> 4;
 137                 }
 138         }
 139         return ST21NFCB_ATR_DEFAULT_BWI;
 140 }
 141
 142 static void st21nfcb_se_get_atr(struct nci_dev *ndev)
 143 {
 144         struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
 145         int r;
 146         struct sk_buff *skb;
 147
 148         r = nci_hci_get_param(ndev, ST21NFCB_APDU_READER_GATE,
 149                                 NCI_HCI_APDU_PARAM_ATR, &skb);
 150         if (r < 0)
 151                 return;
 152
 153         if (skb->len <= ST21NFCB_ESE_MAX_LENGTH) {
 154                 memcpy(info->se_info.atr, skb->data, skb->len);
 155
 156                 info->se_info.wt_timeout =
 157                         ST21NFCB_BWI_TO_TIMEOUT(st21nfcb_se_get_bwi(ndev));
 158         }
 159         kfree_skb(skb);
 160 }
 161
 162 int st21nfcb_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 st21nfcb_pipe_info *dm_pipe_info;
 167         u8 pipe_list[] = { ST21NFCB_DM_GETINFO_PIPE_LIST,
 168                         ST21NFCB_TERMINAL_HOST_ID};
 169         u8 pipe_info[] = { ST21NFCB_DM_GETINFO_PIPE_INFO,
 170                         ST21NFCB_TERMINAL_HOST_ID, 0};
 171
 172         /* On ST21NFCB 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 ST21NFCB is to:
 179          * - get a pipe list for each host.
 180          * (eg: ST21NFCB_HOST_CONTROLLER_ID for now).
 181          * (TODO Later on UICC HOST and eSE HOST)
 182          * - get pipe information
 183          * - match retrieved pipe list in st21nfcb_gates
 184          * ST21NFCB_DEVICE_MGNT_GATE is a proprietary gate
 185          * with ST21NFCB_DEVICE_MGNT_PIPE.
 186          * Pipe can be closed and need to be open.
 187          */
 188         r = nci_hci_connect_gate(ndev, ST21NFCB_HOST_CONTROLLER_ID,
 189                                 ST21NFCB_DEVICE_MGNT_GATE,
 190                                 ST21NFCB_DEVICE_MGNT_PIPE);
 191         if (r < 0)
 192                 goto free_info;
 193
 194         /* Get pipe list */
 195         r = nci_hci_send_cmd(ndev, ST21NFCB_DEVICE_MGNT_GATE,
 196                         ST21NFCB_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, ST21NFCB_DEVICE_MGNT_GATE,
 205                                         ST21NFCB_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 st21nfcb_pipe_info *)skb_pipe_info->data;
 221                 if (dm_pipe_info->dst_gate_id == ST21NFCB_APDU_READER_GATE &&
 222                     dm_pipe_info->src_host_id != ST21NFCB_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(st21nfcb_gates)) &&
 229                      (st21nfcb_gates[j].gate != dm_pipe_info->dst_gate_id); j++)
 230                         ;
 231
 232                 if (j < ARRAY_SIZE(st21nfcb_gates) &&
 233                     st21nfcb_gates[j].gate == dm_pipe_info->dst_gate_id &&
 234                     ST21NFCB_DM_IS_PIPE_OPEN(dm_pipe_info->pipe_state)) {
 235                         st21nfcb_gates[j].pipe = pipe_info[2];
 236
 237                         ndev->hci_dev->gate2pipe[st21nfcb_gates[j].gate] =
 238                                                 st21nfcb_gates[j].pipe;
 239                         ndev->hci_dev->pipes[st21nfcb_gates[j].pipe].gate =
 240                                                 st21nfcb_gates[j].gate;
 241                         ndev->hci_dev->pipes[st21nfcb_gates[j].pipe].host =
 242                                                 dm_pipe_info->src_host_id;
 243                 }
 244         }
 245
 246         memcpy(ndev->hci_dev->init_data.gates, st21nfcb_gates,
 247                sizeof(st21nfcb_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(st21nfcb_hci_load_session);
 255
 256 static void st21nfcb_hci_admin_event_received(struct nci_dev *ndev,
 257                                               u8 event, struct sk_buff *skb)
 258 {
 259         struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
 260
 261         switch (event) {
 262         case ST21NFCB_EVT_HOT_PLUG:
 263                 if (info->se_info.se_active) {
 264                         if (!ST21NFCB_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(ST21NFCB_SE_TO_PIPES));
 272                         }
 273                 }
 274         break;
 275         }
 276 }
 277
 278 static int st21nfcb_hci_apdu_reader_event_received(struct nci_dev *ndev,
 279                                                    u8 event,
 280                                                    struct sk_buff *skb)
 281 {
 282         int r = 0;
 283         struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
 284
 285         pr_debug("apdu reader gate event: %x\n", event);
 286
 287         switch (event) {
 288         case ST21NFCB_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 ST21NFCB_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 st21nfcb_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 ST21NFCB_EVT_CONNECTIVITY:
 321
 322         break;
 323         case ST21NFCB_EVT_TRANSACTION:
 324                 if (skb->len < NFC_MIN_AID_LENGTH + 2 &&
 325                     skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)
 326                         return -EPROTO;
 327
 328                 transaction = (struct nfc_evt_transaction *)devm_kzalloc(dev,
 329                                             skb->len - 2, GFP_KERNEL);
 330
 331                 transaction->aid_len = skb->data[1];
 332                 memcpy(transaction->aid, &skb->data[2], skb->data[1]);
 333
 334                 if (skb->data[transaction->aid_len + 2] !=
 335                     NFC_EVT_TRANSACTION_PARAMS_TAG)
 336                         return -EPROTO;
 337
 338                 transaction->params_len = skb->data[transaction->aid_len + 3];
 339                 memcpy(transaction->params, skb->data +
 340                        transaction->aid_len + 4, transaction->params_len);
 341
 342                 r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
 343         default:
 344                 return 1;
 345         }
 346         kfree_skb(skb);
 347         return r;
 348 }
 349
 350 void st21nfcb_hci_event_received(struct nci_dev *ndev, u8 pipe,
 351                                  u8 event, struct sk_buff *skb)
 352 {
 353         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 354         u8 host = ndev->hci_dev->pipes[pipe].host;
 355
 356         switch (gate) {
 357         case NCI_HCI_ADMIN_GATE:
 358                 st21nfcb_hci_admin_event_received(ndev, event, skb);
 359         break;
 360         case ST21NFCB_APDU_READER_GATE:
 361                 st21nfcb_hci_apdu_reader_event_received(ndev, event, skb);
 362         break;
 363         case ST21NFCB_CONNECTIVITY_GATE:
 364                 st21nfcb_hci_connectivity_event_received(ndev, host, event,
 365                                                          skb);
 366         break;
 367         }
 368 }
 369 EXPORT_SYMBOL_GPL(st21nfcb_hci_event_received);
 370
 371
 372 void st21nfcb_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
 373                                struct sk_buff *skb)
 374 {
 375         struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
 376         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 377
 378         pr_debug("cmd: %x\n", cmd);
 379
 380         switch (cmd) {
 381         case NCI_HCI_ANY_OPEN_PIPE:
 382                 if (gate != ST21NFCB_APDU_READER_GATE &&
 383                     ndev->hci_dev->pipes[pipe].host != ST21NFCB_UICC_HOST_ID)
 384                         ndev->hci_dev->count_pipes++;
 385
 386                 if (ndev->hci_dev->count_pipes ==
 387                     ndev->hci_dev->expected_pipes) {
 388                         del_timer_sync(&info->se_info.se_active_timer);
 389                         info->se_info.se_active = false;
 390                         ndev->hci_dev->count_pipes = 0;
 391                         complete(&info->se_info.req_completion);
 392                 }
 393         break;
 394         }
 395 }
 396 EXPORT_SYMBOL_GPL(st21nfcb_hci_cmd_received);
 397
 398 /*
 399  * Remarks: On some early st21nfcb firmware, nci_nfcee_mode_set(0)
 400  * is rejected
 401  */
 402 static int st21nfcb_nci_control_se(struct nci_dev *ndev, u8 se_idx,
 403                                    u8 state)
 404 {
 405         struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
 406         int r;
 407         struct sk_buff *sk_host_list;
 408         u8 host_id;
 409
 410         switch (se_idx) {
 411         case ST21NFCB_UICC_HOST_ID:
 412                 ndev->hci_dev->count_pipes = 0;
 413                 ndev->hci_dev->expected_pipes = ST21NFCB_SE_COUNT_PIPE_UICC;
 414                 break;
 415         case ST21NFCB_ESE_HOST_ID:
 416                 ndev->hci_dev->count_pipes = 0;
 417                 ndev->hci_dev->expected_pipes = ST21NFCB_SE_COUNT_PIPE_EMBEDDED;
 418                 break;
 419         default:
 420                 return -EINVAL;
 421         }
 422
 423         /*
 424          * Wait for an EVT_HOT_PLUG in order to
 425          * retrieve a relevant host list.
 426          */
 427         reinit_completion(&info->se_info.req_completion);
 428         r = nci_nfcee_mode_set(ndev, se_idx, NCI_NFCEE_ENABLE);
 429         if (r != NCI_STATUS_OK)
 430                 return r;
 431
 432         mod_timer(&info->se_info.se_active_timer, jiffies +
 433                 msecs_to_jiffies(ST21NFCB_SE_TO_HOT_PLUG));
 434         info->se_info.se_active = true;
 435
 436         /* Ignore return value and check in any case the host_list */
 437         wait_for_completion_interruptible(&info->se_info.req_completion);
 438
 439         /* There might be some "collision" after receiving a HOT_PLUG event
 440          * This may cause the CLF to not answer to the next hci command.
 441          * There is no possible synchronization to prevent this.
 442          * Adding a small delay is the only way to solve the issue.
 443          */
 444         usleep_range(3000, 5000);
 445
 446         r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 447                         NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
 448         if (r != NCI_HCI_ANY_OK)
 449                 return r;
 450
 451         host_id = sk_host_list->data[sk_host_list->len - 1];
 452         kfree_skb(sk_host_list);
 453         if (state == ST21NFCB_SE_MODE_ON && host_id == se_idx)
 454                 return se_idx;
 455         else if (state == ST21NFCB_SE_MODE_OFF && host_id != se_idx)
 456                 return se_idx;
 457
 458         return -1;
 459 }
 460
 461 int st21nfcb_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
 462 {
 463         int r;
 464
 465         pr_debug("st21nfcb_nci_disable_se\n");
 466
 467         if (se_idx == NFC_SE_EMBEDDED) {
 468                 r = nci_hci_send_event(ndev, ST21NFCB_APDU_READER_GATE,
 469                                 ST21NFCB_EVT_SE_END_OF_APDU_TRANSFER, NULL, 0);
 470                 if (r < 0)
 471                         return r;
 472         }
 473
 474         return 0;
 475 }
 476 EXPORT_SYMBOL_GPL(st21nfcb_nci_disable_se);
 477
 478 int st21nfcb_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
 479 {
 480         int r;
 481
 482         pr_debug("st21nfcb_nci_enable_se\n");
 483
 484         if (se_idx == ST21NFCB_HCI_HOST_ID_ESE) {
 485                 r = nci_hci_send_event(ndev, ST21NFCB_APDU_READER_GATE,
 486                                 ST21NFCB_EVT_SE_SOFT_RESET, NULL, 0);
 487                 if (r < 0)
 488                         return r;
 489         }
 490
 491         return 0;
 492 }
 493 EXPORT_SYMBOL_GPL(st21nfcb_nci_enable_se);
 494
 495 static int st21nfcb_hci_network_init(struct nci_dev *ndev)
 496 {
 497         struct core_conn_create_dest_spec_params *dest_params;
 498         struct dest_spec_params spec_params;
 499         struct nci_conn_info    *conn_info;
 500         int r, dev_num;
 501
 502         dest_params =
 503                 kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
 504                         sizeof(struct dest_spec_params), GFP_KERNEL);
 505         if (dest_params == NULL) {
 506                 r = -ENOMEM;
 507                 goto exit;
 508         }
 509
 510         dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
 511         dest_params->length = sizeof(struct dest_spec_params);
 512         spec_params.id = ndev->hci_dev->nfcee_id;
 513         spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
 514         memcpy(dest_params->value, &spec_params, sizeof(struct dest_spec_params));
 515         r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
 516                                  sizeof(struct core_conn_create_dest_spec_params) +
 517                                  sizeof(struct dest_spec_params),
 518                                  dest_params);
 519         if (r != NCI_STATUS_OK)
 520                 goto free_dest_params;
 521
 522         conn_info = ndev->hci_dev->conn_info;
 523         if (!conn_info)
 524                 goto free_dest_params;
 525
 526         memcpy(ndev->hci_dev->init_data.gates, st21nfcb_gates,
 527                sizeof(st21nfcb_gates));
 528
 529         /*
 530          * Session id must include the driver name + i2c bus addr
 531          * persistent info to discriminate 2 identical chips
 532          */
 533         dev_num = find_first_zero_bit(dev_mask, ST21NFCB_NUM_DEVICES);
 534         if (dev_num >= ST21NFCB_NUM_DEVICES) {
 535                 r = -ENODEV;
 536                 goto free_dest_params;
 537         }
 538
 539         scnprintf(ndev->hci_dev->init_data.session_id,
 540                   sizeof(ndev->hci_dev->init_data.session_id),
 541                   "%s%2x", "ST21BH", dev_num);
 542
 543         r = nci_hci_dev_session_init(ndev);
 544         if (r != NCI_HCI_ANY_OK)
 545                 goto exit;
 546
 547         r = nci_nfcee_mode_set(ndev, ndev->hci_dev->conn_info->id,
 548                                NCI_NFCEE_ENABLE);
 549         if (r != NCI_STATUS_OK)
 550                 goto exit;
 551
 552         return 0;
 553
 554 free_dest_params:
 555         kfree(dest_params);
 556
 557 exit:
 558         return r;
 559 }
 560
 561 int st21nfcb_nci_discover_se(struct nci_dev *ndev)
 562 {
 563         u8 param[2];
 564         int r;
 565         int se_count = 0;
 566
 567         pr_debug("st21nfcb_nci_discover_se\n");
 568
 569         r = st21nfcb_hci_network_init(ndev);
 570         if (r != 0)
 571                 return r;
 572
 573         param[0] = ST21NFCB_UICC_HOST_ID;
 574         param[1] = ST21NFCB_HCI_HOST_ID_ESE;
 575         r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 576                                 NCI_HCI_ADMIN_PARAM_WHITELIST,
 577                                 param, sizeof(param));
 578         if (r != NCI_HCI_ANY_OK)
 579                 return r;
 580
 581         r = st21nfcb_nci_control_se(ndev, ST21NFCB_UICC_HOST_ID,
 582                                 ST21NFCB_SE_MODE_ON);
 583         if (r == ST21NFCB_UICC_HOST_ID) {
 584                 nfc_add_se(ndev->nfc_dev, ST21NFCB_UICC_HOST_ID, NFC_SE_UICC);
 585                 se_count++;
 586         }
 587
 588         /* Try to enable eSE in order to check availability */
 589         r = st21nfcb_nci_control_se(ndev, ST21NFCB_HCI_HOST_ID_ESE,
 590                                 ST21NFCB_SE_MODE_ON);
 591         if (r == ST21NFCB_HCI_HOST_ID_ESE) {
 592                 nfc_add_se(ndev->nfc_dev, ST21NFCB_HCI_HOST_ID_ESE,
 593                            NFC_SE_EMBEDDED);
 594                 se_count++;
 595                 st21nfcb_se_get_atr(ndev);
 596         }
 597
 598         return !se_count;
 599 }
 600 EXPORT_SYMBOL_GPL(st21nfcb_nci_discover_se);
 601
 602 int st21nfcb_nci_se_io(struct nci_dev *ndev, u32 se_idx,
 603                        u8 *apdu, size_t apdu_length,
 604                        se_io_cb_t cb, void *cb_context)
 605 {
 606         struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
 607
 608         pr_debug("\n");
 609
 610         switch (se_idx) {
 611         case ST21NFCB_HCI_HOST_ID_ESE:
 612                 info->se_info.cb = cb;
 613                 info->se_info.cb_context = cb_context;
 614                 mod_timer(&info->se_info.bwi_timer, jiffies +
 615                           msecs_to_jiffies(info->se_info.wt_timeout));
 616                 info->se_info.bwi_active = true;
 617                 return nci_hci_send_event(ndev, ST21NFCB_APDU_READER_GATE,
 618                                         ST21NFCB_EVT_TRANSMIT_DATA, apdu,
 619                                         apdu_length);
 620         default:
 621                 return -ENODEV;
 622         }
 623 }
 624 EXPORT_SYMBOL(st21nfcb_nci_se_io);
 625
 626 static void st21nfcb_se_wt_timeout(unsigned long data)
 627 {
 628         /*
 629          * No answer from the secure element
 630          * within the defined timeout.
 631          * Let's send a reset request as recovery procedure.
 632          * According to the situation, we first try to send a software reset
 633          * to the secure element. If the next command is still not
 634          * answering in time, we send to the CLF a secure element hardware
 635          * reset request.
 636          */
 637         /* hardware reset managed through VCC_UICC_OUT power supply */
 638         u8 param = 0x01;
 639         struct st21nfcb_nci_info *info = (struct st21nfcb_nci_info *) data;
 640
 641         pr_debug("\n");
 642
 643         info->se_info.bwi_active = false;
 644
 645         if (!info->se_info.xch_error) {
 646                 info->se_info.xch_error = true;
 647                 nci_hci_send_event(info->ndlc->ndev, ST21NFCB_APDU_READER_GATE,
 648                                 ST21NFCB_EVT_SE_SOFT_RESET, NULL, 0);
 649         } else {
 650                 info->se_info.xch_error = false;
 651                 nci_hci_send_event(info->ndlc->ndev, ST21NFCB_DEVICE_MGNT_GATE,
 652                                 ST21NFCB_EVT_SE_HARD_RESET, &param, 1);
 653         }
 654         info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
 655 }
 656
 657 static void st21nfcb_se_activation_timeout(unsigned long data)
 658 {
 659         struct st21nfcb_nci_info *info = (struct st21nfcb_nci_info *) data;
 660
 661         pr_debug("\n");
 662
 663         info->se_info.se_active = false;
 664
 665         complete(&info->se_info.req_completion);
 666 }
 667
 668 int st21nfcb_se_init(struct nci_dev *ndev)
 669 {
 670         struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
 671
 672         init_completion(&info->se_info.req_completion);
 673         /* initialize timers */
 674         init_timer(&info->se_info.bwi_timer);
 675         info->se_info.bwi_timer.data = (unsigned long)info;
 676         info->se_info.bwi_timer.function = st21nfcb_se_wt_timeout;
 677         info->se_info.bwi_active = false;
 678
 679         init_timer(&info->se_info.se_active_timer);
 680         info->se_info.se_active_timer.data = (unsigned long)info;
 681         info->se_info.se_active_timer.function =
 682                         st21nfcb_se_activation_timeout;
 683         info->se_info.se_active = false;
 684
 685         info->se_info.xch_error = false;
 686
 687         info->se_info.wt_timeout =
 688                 ST21NFCB_BWI_TO_TIMEOUT(ST21NFCB_ATR_DEFAULT_BWI);
 689
 690         return 0;
 691 }
 692 EXPORT_SYMBOL(st21nfcb_se_init);
 693
 694 void st21nfcb_se_deinit(struct nci_dev *ndev)
 695 {
 696         struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
 697
 698         if (info->se_info.bwi_active)
 699                 del_timer_sync(&info->se_info.bwi_timer);
 700         if (info->se_info.se_active)
 701                 del_timer_sync(&info->se_info.se_active_timer);
 702
 703         info->se_info.se_active = false;
 704         info->se_info.bwi_active = false;
 705 }
 706 EXPORT_SYMBOL(st21nfcb_se_deinit);
 707