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
 117         /* Secure element pipes are created by secure element host */
 118         {ST_NCI_CONNECTIVITY_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
 119                                         ST_NCI_HOST_CONTROLLER_ID},
 120         {ST_NCI_APDU_READER_GATE, NCI_HCI_DO_NOT_OPEN_PIPE,
 121                                         ST_NCI_HOST_CONTROLLER_ID},
 122 };
 123
 124 static u8 st_nci_se_get_bwi(struct nci_dev *ndev)
 125 {
 126         int i;
 127         u8 td;
 128         struct st_nci_info *info = nci_get_drvdata(ndev);
 129
 130         /* Bits 8 to 5 of the first TB for T=1 encode BWI from zero to nine */
 131         for (i = 1; i < ST_NCI_ESE_MAX_LENGTH; i++) {
 132                 td = ST_NCI_ATR_GET_Y_FROM_TD(info->se_info.atr[i]);
 133                 if (ST_NCI_ATR_TA_PRESENT(td))
 134                         i++;
 135                 if (ST_NCI_ATR_TB_PRESENT(td)) {
 136                         i++;
 137                         return info->se_info.atr[i] >> 4;
 138                 }
 139         }
 140         return ST_NCI_ATR_DEFAULT_BWI;
 141 }
 142
 143 static void st_nci_se_get_atr(struct nci_dev *ndev)
 144 {
 145         struct st_nci_info *info = nci_get_drvdata(ndev);
 146         int r;
 147         struct sk_buff *skb;
 148
 149         r = nci_hci_get_param(ndev, ST_NCI_APDU_READER_GATE,
 150                                 NCI_HCI_APDU_PARAM_ATR, &skb);
 151         if (r < 0)
 152                 return;
 153
 154         if (skb->len <= ST_NCI_ESE_MAX_LENGTH) {
 155                 memcpy(info->se_info.atr, skb->data, skb->len);
 156
 157                 info->se_info.wt_timeout =
 158                         ST_NCI_BWI_TO_TIMEOUT(st_nci_se_get_bwi(ndev));
 159         }
 160         kfree_skb(skb);
 161 }
 162
 163 int st_nci_hci_load_session(struct nci_dev *ndev)
 164 {
 165         int i, j, r;
 166         struct sk_buff *skb_pipe_list, *skb_pipe_info;
 167         struct st_nci_pipe_info *dm_pipe_info;
 168         u8 pipe_list[] = { ST_NCI_DM_GETINFO_PIPE_LIST,
 169                         ST_NCI_TERMINAL_HOST_ID};
 170         u8 pipe_info[] = { ST_NCI_DM_GETINFO_PIPE_INFO,
 171                         ST_NCI_TERMINAL_HOST_ID, 0};
 172
 173         /* On ST_NCI device pipes number are dynamics
 174          * If pipes are already created, hci_dev_up will fail.
 175          * Doing a clear all pipe is a bad idea because:
 176          * - It does useless EEPROM cycling
 177          * - It might cause issue for secure elements support
 178          * (such as removing connectivity or APDU reader pipe)
 179          * A better approach on ST_NCI is to:
 180          * - get a pipe list for each host.
 181          * (eg: ST_NCI_HOST_CONTROLLER_ID for now).
 182          * (TODO Later on UICC HOST and eSE HOST)
 183          * - get pipe information
 184          * - match retrieved pipe list in st_nci_gates
 185          * ST_NCI_DEVICE_MGNT_GATE is a proprietary gate
 186          * with ST_NCI_DEVICE_MGNT_PIPE.
 187          * Pipe can be closed and need to be open.
 188          */
 189         r = nci_hci_connect_gate(ndev, ST_NCI_HOST_CONTROLLER_ID,
 190                                 ST_NCI_DEVICE_MGNT_GATE,
 191                                 ST_NCI_DEVICE_MGNT_PIPE);
 192         if (r < 0)
 193                 return r;
 194
 195         /* Get pipe list */
 196         r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
 197                         ST_NCI_DM_GETINFO, pipe_list, sizeof(pipe_list),
 198                         &skb_pipe_list);
 199         if (r < 0)
 200                 return r;
 201
 202         /* Complete the existing gate_pipe table */
 203         for (i = 0; i < skb_pipe_list->len; i++) {
 204                 pipe_info[2] = skb_pipe_list->data[i];
 205                 r = nci_hci_send_cmd(ndev, ST_NCI_DEVICE_MGNT_GATE,
 206                                         ST_NCI_DM_GETINFO, pipe_info,
 207                                         sizeof(pipe_info), &skb_pipe_info);
 208
 209                 if (r)
 210                         continue;
 211
 212                 /*
 213                  * Match pipe ID and gate ID
 214                  * Output format from ST21NFC_DM_GETINFO is:
 215                  * - pipe state (1byte)
 216                  * - source hid (1byte)
 217                  * - source gid (1byte)
 218                  * - destination hid (1byte)
 219                  * - destination gid (1byte)
 220                  */
 221                 dm_pipe_info = (struct st_nci_pipe_info *)skb_pipe_info->data;
 222                 if (dm_pipe_info->dst_gate_id == ST_NCI_APDU_READER_GATE &&
 223                     dm_pipe_info->src_host_id == ST_NCI_UICC_HOST_ID) {
 224                         pr_err("Unexpected apdu_reader pipe on host %x\n",
 225                                dm_pipe_info->src_host_id);
 226                         kfree_skb(skb_pipe_info);
 227                         continue;
 228                 }
 229
 230                 for (j = 3; (j < ARRAY_SIZE(st_nci_gates)) &&
 231                      (st_nci_gates[j].gate != dm_pipe_info->dst_gate_id); j++)
 232                         ;
 233
 234                 if (j < ARRAY_SIZE(st_nci_gates) &&
 235                     st_nci_gates[j].gate == dm_pipe_info->dst_gate_id &&
 236                     ST_NCI_DM_IS_PIPE_OPEN(dm_pipe_info->pipe_state)) {
 237                         ndev->hci_dev->init_data.gates[j].pipe = pipe_info[2];
 238
 239                         ndev->hci_dev->gate2pipe[st_nci_gates[j].gate] =
 240                                                 pipe_info[2];
 241                         ndev->hci_dev->pipes[pipe_info[2]].gate =
 242                                                 st_nci_gates[j].gate;
 243                         ndev->hci_dev->pipes[pipe_info[2]].host =
 244                                                 dm_pipe_info->src_host_id;
 245                 }
 246                 kfree_skb(skb_pipe_info);
 247         }
 248
 249         /*
 250          * 3 gates have a well known pipe ID. Only NCI_HCI_LINK_MGMT_GATE
 251          * is not yet open at this stage.
 252          */
 253         r = nci_hci_connect_gate(ndev, ST_NCI_HOST_CONTROLLER_ID,
 254                                  NCI_HCI_LINK_MGMT_GATE,
 255                                  NCI_HCI_LINK_MGMT_PIPE);
 256
 257         kfree_skb(skb_pipe_list);
 258         return r;
 259 }
 260 EXPORT_SYMBOL_GPL(st_nci_hci_load_session);
 261
 262 static void st_nci_hci_admin_event_received(struct nci_dev *ndev,
 263                                               u8 event, struct sk_buff *skb)
 264 {
 265         struct st_nci_info *info = nci_get_drvdata(ndev);
 266
 267         switch (event) {
 268         case ST_NCI_EVT_HOT_PLUG:
 269                 if (info->se_info.se_active) {
 270                         if (!ST_NCI_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
 271                                 del_timer_sync(&info->se_info.se_active_timer);
 272                                 info->se_info.se_active = false;
 273                                 complete(&info->se_info.req_completion);
 274                         } else {
 275                                 mod_timer(&info->se_info.se_active_timer,
 276                                       jiffies +
 277                                       msecs_to_jiffies(ST_NCI_SE_TO_PIPES));
 278                         }
 279                 }
 280         break;
 281         default:
 282                 nfc_err(&ndev->nfc_dev->dev, "Unexpected event on admin gate\n");
 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         default:
 307                 nfc_err(&ndev->nfc_dev->dev, "Unexpected event on apdu reader gate\n");
 308                 return 1;
 309         }
 310
 311         kfree_skb(skb);
 312         return r;
 313 }
 314
 315 /*
 316  * Returns:
 317  * <= 0: driver handled the event, skb consumed
 318  *    1: driver does not handle the event, please do standard processing
 319  */
 320 static int st_nci_hci_connectivity_event_received(struct nci_dev *ndev,
 321                                                 u8 host, u8 event,
 322                                                 struct sk_buff *skb)
 323 {
 324         int r = 0;
 325         struct device *dev = &ndev->nfc_dev->dev;
 326         struct nfc_evt_transaction *transaction;
 327
 328         pr_debug("connectivity gate event: %x\n", event);
 329
 330         switch (event) {
 331         case ST_NCI_EVT_CONNECTIVITY:
 332                 r = nfc_se_connectivity(ndev->nfc_dev, host);
 333         break;
 334         case ST_NCI_EVT_TRANSACTION:
 335                 /* According to specification etsi 102 622
 336                  * 11.2.2.4 EVT_TRANSACTION Table 52
 337                  * Description  Tag     Length
 338                  * AID          81      5 to 16
 339                  * PARAMETERS   82      0 to 255
 340                  */
 341                 if (skb->len < NFC_MIN_AID_LENGTH + 2 ||
 342                     skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)
 343                         return -EPROTO;
 344
 345                 transaction = (struct nfc_evt_transaction *)devm_kzalloc(dev,
 346                                             skb->len - 2, GFP_KERNEL);
 347                 if (!transaction)
 348                         return -ENOMEM;
 349
 350                 transaction->aid_len = skb->data[1];
 351                 memcpy(transaction->aid, &skb->data[2], transaction->aid_len);
 352
 353                 /* Check next byte is PARAMETERS tag (82) */
 354                 if (skb->data[transaction->aid_len + 2] !=
 355                     NFC_EVT_TRANSACTION_PARAMS_TAG) {
 356                         devm_kfree(dev, transaction);
 357                         return -EPROTO;
 358                 }
 359
 360                 transaction->params_len = skb->data[transaction->aid_len + 3];
 361                 memcpy(transaction->params, skb->data +
 362                        transaction->aid_len + 4, transaction->params_len);
 363
 364                 r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
 365                 break;
 366         default:
 367                 nfc_err(&ndev->nfc_dev->dev, "Unexpected event on connectivity gate\n");
 368                 return 1;
 369         }
 370         kfree_skb(skb);
 371         return r;
 372 }
 373
 374 void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
 375                                  u8 event, struct sk_buff *skb)
 376 {
 377         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 378         u8 host = ndev->hci_dev->pipes[pipe].host;
 379
 380         switch (gate) {
 381         case NCI_HCI_ADMIN_GATE:
 382                 st_nci_hci_admin_event_received(ndev, event, skb);
 383         break;
 384         case ST_NCI_APDU_READER_GATE:
 385                 st_nci_hci_apdu_reader_event_received(ndev, event, skb);
 386         break;
 387         case ST_NCI_CONNECTIVITY_GATE:
 388                 st_nci_hci_connectivity_event_received(ndev, host, event, skb);
 389         break;
 390         }
 391 }
 392 EXPORT_SYMBOL_GPL(st_nci_hci_event_received);
 393
 394 void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
 395                                struct sk_buff *skb)
 396 {
 397         struct st_nci_info *info = nci_get_drvdata(ndev);
 398         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 399
 400         pr_debug("cmd: %x\n", cmd);
 401
 402         switch (cmd) {
 403         case NCI_HCI_ANY_OPEN_PIPE:
 404                 if (gate != ST_NCI_APDU_READER_GATE &&
 405                     ndev->hci_dev->pipes[pipe].host != ST_NCI_UICC_HOST_ID)
 406                         ndev->hci_dev->count_pipes++;
 407
 408                 if (ndev->hci_dev->count_pipes ==
 409                     ndev->hci_dev->expected_pipes) {
 410                         del_timer_sync(&info->se_info.se_active_timer);
 411                         info->se_info.se_active = false;
 412                         ndev->hci_dev->count_pipes = 0;
 413                         complete(&info->se_info.req_completion);
 414                 }
 415         break;
 416         }
 417 }
 418 EXPORT_SYMBOL_GPL(st_nci_hci_cmd_received);
 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, i;
 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, state);
 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         if (info->se_info.se_status->is_ese_present &&
 463             info->se_info.se_status->is_uicc_present)
 464                 usleep_range(15000, 20000);
 465
 466         r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
 467                         NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list);
 468         if (r != NCI_HCI_ANY_OK)
 469                 return r;
 470
 471         for (i = 0; i < sk_host_list->len &&
 472                 sk_host_list->data[i] != se_idx; i++)
 473                 ;
 474         host_id = sk_host_list->data[i];
 475         kfree_skb(sk_host_list);
 476         if (state == ST_NCI_SE_MODE_ON && host_id == se_idx)
 477                 return se_idx;
 478         else if (state == ST_NCI_SE_MODE_OFF && host_id != se_idx)
 479                 return se_idx;
 480
 481         return -1;
 482 }
 483
 484 int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
 485 {
 486         int r;
 487
 488         pr_debug("st_nci_disable_se\n");
 489
 490         /*
 491          * According to upper layer, se_idx == NFC_SE_UICC when
 492          * info->se_info.se_status->is_uicc_enable is true should never happen
 493          * Same for eSE.
 494          */
 495         r = st_nci_control_se(ndev, se_idx, ST_NCI_SE_MODE_OFF);
 496         if (r < 0) {
 497                 /* Do best effort to release SWP */
 498                 if (se_idx == NFC_SE_EMBEDDED) {
 499                         r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 500                                         ST_NCI_EVT_SE_END_OF_APDU_TRANSFER,
 501                                         NULL, 0);
 502                 }
 503                 return r;
 504         }
 505
 506         return 0;
 507 }
 508 EXPORT_SYMBOL_GPL(st_nci_disable_se);
 509
 510 int st_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
 511 {
 512         int r;
 513
 514         pr_debug("st_nci_enable_se\n");
 515
 516         /*
 517          * According to upper layer, se_idx == NFC_SE_UICC when
 518          * info->se_info.se_status->is_uicc_enable is true should never happen.
 519          * Same for eSE.
 520          */
 521         r = st_nci_control_se(ndev, se_idx, ST_NCI_SE_MODE_ON);
 522         if (r == ST_NCI_ESE_HOST_ID) {
 523                 st_nci_se_get_atr(ndev);
 524                 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 525                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 526         }
 527
 528         if (r < 0) {
 529                 /*
 530                  * The activation procedure failed, the secure element
 531                  * is not connected. Remove from the list.
 532                  */
 533                 nfc_remove_se(ndev->nfc_dev, se_idx);
 534                 return r;
 535         }
 536
 537         return 0;
 538 }
 539 EXPORT_SYMBOL_GPL(st_nci_enable_se);
 540
 541 static int st_nci_hci_network_init(struct nci_dev *ndev)
 542 {
 543         struct st_nci_info *info = nci_get_drvdata(ndev);
 544         struct core_conn_create_dest_spec_params *dest_params;
 545         struct dest_spec_params spec_params;
 546         struct nci_conn_info    *conn_info;
 547         int r, dev_num;
 548
 549         dest_params =
 550                 kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
 551                         sizeof(struct dest_spec_params), GFP_KERNEL);
 552         if (dest_params == NULL) {
 553                 r = -ENOMEM;
 554                 goto exit;
 555         }
 556
 557         dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
 558         dest_params->length = sizeof(struct dest_spec_params);
 559         spec_params.id = ndev->hci_dev->nfcee_id;
 560         spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
 561         memcpy(dest_params->value, &spec_params,
 562                sizeof(struct dest_spec_params));
 563         r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
 564                                  sizeof(struct core_conn_create_dest_spec_params) +
 565                                  sizeof(struct dest_spec_params),
 566                                  dest_params);
 567         if (r != NCI_STATUS_OK)
 568                 goto free_dest_params;
 569
 570         conn_info = ndev->hci_dev->conn_info;
 571         if (!conn_info)
 572                 goto free_dest_params;
 573
 574         ndev->hci_dev->init_data.gate_count = ARRAY_SIZE(st_nci_gates);
 575         memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
 576                sizeof(st_nci_gates));
 577
 578         /*
 579          * Session id must include the driver name + i2c bus addr
 580          * persistent info to discriminate 2 identical chips
 581          */
 582         dev_num = find_first_zero_bit(dev_mask, ST_NCI_NUM_DEVICES);
 583         if (dev_num >= ST_NCI_NUM_DEVICES) {
 584                 r = -ENODEV;
 585                 goto free_dest_params;
 586         }
 587
 588         scnprintf(ndev->hci_dev->init_data.session_id,
 589                   sizeof(ndev->hci_dev->init_data.session_id),
 590                   "%s%2x", "ST21BH", dev_num);
 591
 592         r = nci_hci_dev_session_init(ndev);
 593         if (r != NCI_HCI_ANY_OK)
 594                 goto free_dest_params;
 595
 596         /*
 597          * In factory mode, we prevent secure elements activation
 598          * by disabling nfcee on the current HCI connection id.
 599          * HCI will be used here only for proprietary commands.
 600          */
 601         if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
 602                 r = nci_nfcee_mode_set(ndev,
 603                                        ndev->hci_dev->conn_info->dest_params->id,
 604                                        NCI_NFCEE_DISABLE);
 605         else
 606                 r = nci_nfcee_mode_set(ndev,
 607                                        ndev->hci_dev->conn_info->dest_params->id,
 608                                        NCI_NFCEE_ENABLE);
 609
 610 free_dest_params:
 611         kfree(dest_params);
 612
 613 exit:
 614         return r;
 615 }
 616
 617 int st_nci_discover_se(struct nci_dev *ndev)
 618 {
 619         u8 white_list[2];
 620         int r, wl_size = 0;
 621         int se_count = 0;
 622         struct st_nci_info *info = nci_get_drvdata(ndev);
 623
 624         pr_debug("st_nci_discover_se\n");
 625
 626         r = st_nci_hci_network_init(ndev);
 627         if (r != 0)
 628                 return r;
 629
 630         if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
 631                 return 0;
 632
 633         if (info->se_info.se_status->is_uicc_present)
 634                 white_list[wl_size++] = ST_NCI_UICC_HOST_ID;
 635         if (info->se_info.se_status->is_ese_present)
 636                 white_list[wl_size++] = ST_NCI_ESE_HOST_ID;
 637
 638         if (wl_size) {
 639                 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 640                                       NCI_HCI_ADMIN_PARAM_WHITELIST,
 641                                       white_list, wl_size);
 642                 if (r != NCI_HCI_ANY_OK)
 643                         return r;
 644         }
 645
 646         if (info->se_info.se_status->is_uicc_present) {
 647                 nfc_add_se(ndev->nfc_dev, ST_NCI_UICC_HOST_ID, NFC_SE_UICC);
 648                 se_count++;
 649         }
 650
 651         if (info->se_info.se_status->is_ese_present) {
 652                 nfc_add_se(ndev->nfc_dev, ST_NCI_ESE_HOST_ID, NFC_SE_EMBEDDED);
 653                 se_count++;
 654         }
 655
 656         return !se_count;
 657 }
 658 EXPORT_SYMBOL_GPL(st_nci_discover_se);
 659
 660 int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
 661                        u8 *apdu, size_t apdu_length,
 662                        se_io_cb_t cb, void *cb_context)
 663 {
 664         struct st_nci_info *info = nci_get_drvdata(ndev);
 665
 666         pr_debug("\n");
 667
 668         switch (se_idx) {
 669         case ST_NCI_ESE_HOST_ID:
 670                 info->se_info.cb = cb;
 671                 info->se_info.cb_context = cb_context;
 672                 mod_timer(&info->se_info.bwi_timer, jiffies +
 673                           msecs_to_jiffies(info->se_info.wt_timeout));
 674                 info->se_info.bwi_active = true;
 675                 return nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 676                                         ST_NCI_EVT_TRANSMIT_DATA, apdu,
 677                                         apdu_length);
 678         default:
 679                 /* Need to free cb_context here as at the moment we can't
 680                  * clearly indicate to the caller if the callback function
 681                  * would be called (and free it) or not. In both cases a
 682                  * negative value may be returned to the caller.
 683                  */
 684                 kfree(cb_context);
 685                 return -ENODEV;
 686         }
 687 }
 688 EXPORT_SYMBOL(st_nci_se_io);
 689
 690 static void st_nci_se_wt_timeout(struct timer_list *t)
 691 {
 692         /*
 693          * No answer from the secure element
 694          * within the defined timeout.
 695          * Let's send a reset request as recovery procedure.
 696          * According to the situation, we first try to send a software reset
 697          * to the secure element. If the next command is still not
 698          * answering in time, we send to the CLF a secure element hardware
 699          * reset request.
 700          */
 701         /* hardware reset managed through VCC_UICC_OUT power supply */
 702         u8 param = 0x01;
 703         struct st_nci_info *info = from_timer(info, t, se_info.bwi_timer);
 704
 705         pr_debug("\n");
 706
 707         info->se_info.bwi_active = false;
 708
 709         if (!info->se_info.xch_error) {
 710                 info->se_info.xch_error = true;
 711                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_APDU_READER_GATE,
 712                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 713         } else {
 714                 info->se_info.xch_error = false;
 715                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_DEVICE_MGNT_GATE,
 716                                 ST_NCI_EVT_SE_HARD_RESET, &param, 1);
 717         }
 718         info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
 719 }
 720
 721 static void st_nci_se_activation_timeout(struct timer_list *t)
 722 {
 723         struct st_nci_info *info = from_timer(info, t,
 724                                               se_info.se_active_timer);
 725
 726         pr_debug("\n");
 727
 728         info->se_info.se_active = false;
 729
 730         complete(&info->se_info.req_completion);
 731 }
 732
 733 int st_nci_se_init(struct nci_dev *ndev, struct st_nci_se_status *se_status)
 734 {
 735         struct st_nci_info *info = nci_get_drvdata(ndev);
 736
 737         init_completion(&info->se_info.req_completion);
 738         /* initialize timers */
 739         timer_setup(&info->se_info.bwi_timer, st_nci_se_wt_timeout, 0);
 740         info->se_info.bwi_active = false;
 741
 742         timer_setup(&info->se_info.se_active_timer,
 743                     st_nci_se_activation_timeout, 0);
 744         info->se_info.se_active = false;
 745
 746         info->se_info.xch_error = false;
 747
 748         info->se_info.wt_timeout =
 749                 ST_NCI_BWI_TO_TIMEOUT(ST_NCI_ATR_DEFAULT_BWI);
 750
 751         info->se_info.se_status = se_status;
 752
 753         return 0;
 754 }
 755 EXPORT_SYMBOL(st_nci_se_init);
 756
 757 void st_nci_se_deinit(struct nci_dev *ndev)
 758 {
 759         struct st_nci_info *info = nci_get_drvdata(ndev);
 760
 761         if (info->se_info.bwi_active)
 762                 del_timer_sync(&info->se_info.bwi_timer);
 763         if (info->se_info.se_active)
 764                 del_timer_sync(&info->se_info.se_active_timer);
 765
 766         info->se_info.se_active = false;
 767         info->se_info.bwi_active = false;
 768 }
 769 EXPORT_SYMBOL(st_nci_se_deinit);
 770