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                         return -EPROTO;
 357
 358                 transaction->params_len = skb->data[transaction->aid_len + 3];
 359                 memcpy(transaction->params, skb->data +
 360                        transaction->aid_len + 4, transaction->params_len);
 361
 362                 r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
 363                 break;
 364         default:
 365                 nfc_err(&ndev->nfc_dev->dev, "Unexpected event on connectivity gate\n");
 366                 return 1;
 367         }
 368         kfree_skb(skb);
 369         return r;
 370 }
 371
 372 void st_nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
 373                                  u8 event, struct sk_buff *skb)
 374 {
 375         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 376         u8 host = ndev->hci_dev->pipes[pipe].host;
 377
 378         switch (gate) {
 379         case NCI_HCI_ADMIN_GATE:
 380                 st_nci_hci_admin_event_received(ndev, event, skb);
 381         break;
 382         case ST_NCI_APDU_READER_GATE:
 383                 st_nci_hci_apdu_reader_event_received(ndev, event, skb);
 384         break;
 385         case ST_NCI_CONNECTIVITY_GATE:
 386                 st_nci_hci_connectivity_event_received(ndev, host, event, skb);
 387         break;
 388         }
 389 }
 390 EXPORT_SYMBOL_GPL(st_nci_hci_event_received);
 391
 392 void st_nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd,
 393                                struct sk_buff *skb)
 394 {
 395         struct st_nci_info *info = nci_get_drvdata(ndev);
 396         u8 gate = ndev->hci_dev->pipes[pipe].gate;
 397
 398         pr_debug("cmd: %x\n", cmd);
 399
 400         switch (cmd) {
 401         case NCI_HCI_ANY_OPEN_PIPE:
 402                 if (gate != ST_NCI_APDU_READER_GATE &&
 403                     ndev->hci_dev->pipes[pipe].host != ST_NCI_UICC_HOST_ID)
 404                         ndev->hci_dev->count_pipes++;
 405
 406                 if (ndev->hci_dev->count_pipes ==
 407                     ndev->hci_dev->expected_pipes) {
 408                         del_timer_sync(&info->se_info.se_active_timer);
 409                         info->se_info.se_active = false;
 410                         ndev->hci_dev->count_pipes = 0;
 411                         complete(&info->se_info.req_completion);
 412                 }
 413         break;
 414         }
 415 }
 416 EXPORT_SYMBOL_GPL(st_nci_hci_cmd_received);
 417
 418 static int st_nci_control_se(struct nci_dev *ndev, u8 se_idx,
 419                              u8 state)
 420 {
 421         struct st_nci_info *info = nci_get_drvdata(ndev);
 422         int r, i;
 423         struct sk_buff *sk_host_list;
 424         u8 host_id;
 425
 426         switch (se_idx) {
 427         case ST_NCI_UICC_HOST_ID:
 428                 ndev->hci_dev->count_pipes = 0;
 429                 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_UICC;
 430                 break;
 431         case ST_NCI_ESE_HOST_ID:
 432                 ndev->hci_dev->count_pipes = 0;
 433                 ndev->hci_dev->expected_pipes = ST_NCI_SE_COUNT_PIPE_EMBEDDED;
 434                 break;
 435         default:
 436                 return -EINVAL;
 437         }
 438
 439         /*
 440          * Wait for an EVT_HOT_PLUG in order to
 441          * retrieve a relevant host list.
 442          */
 443         reinit_completion(&info->se_info.req_completion);
 444         r = nci_nfcee_mode_set(ndev, se_idx, state);
 445         if (r != NCI_STATUS_OK)
 446                 return r;
 447
 448         mod_timer(&info->se_info.se_active_timer, jiffies +
 449                 msecs_to_jiffies(ST_NCI_SE_TO_HOT_PLUG));
 450         info->se_info.se_active = true;
 451
 452         /* Ignore return value and check in any case the host_list */
 453         wait_for_completion_interruptible(&info->se_info.req_completion);
 454
 455         /* There might be some "collision" after receiving a HOT_PLUG event
 456          * This may cause the CLF to not answer to the next hci command.
 457          * There is no possible synchronization to prevent this.
 458          * Adding a small delay is the only way to solve the issue.
 459          */
 460         if (info->se_info.se_status->is_ese_present &&
 461             info->se_info.se_status->is_uicc_present)
 462                 usleep_range(15000, 20000);
 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         for (i = 0; i < sk_host_list->len &&
 470                 sk_host_list->data[i] != se_idx; i++)
 471                 ;
 472         host_id = sk_host_list->data[i];
 473         kfree_skb(sk_host_list);
 474         if (state == ST_NCI_SE_MODE_ON && host_id == se_idx)
 475                 return se_idx;
 476         else if (state == ST_NCI_SE_MODE_OFF && host_id != se_idx)
 477                 return se_idx;
 478
 479         return -1;
 480 }
 481
 482 int st_nci_disable_se(struct nci_dev *ndev, u32 se_idx)
 483 {
 484         int r;
 485
 486         pr_debug("st_nci_disable_se\n");
 487
 488         /*
 489          * According to upper layer, se_idx == NFC_SE_UICC when
 490          * info->se_info.se_status->is_uicc_enable is true should never happen
 491          * Same for eSE.
 492          */
 493         r = st_nci_control_se(ndev, se_idx, ST_NCI_SE_MODE_OFF);
 494         if (r < 0) {
 495                 /* Do best effort to release SWP */
 496                 if (se_idx == NFC_SE_EMBEDDED) {
 497                         r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 498                                         ST_NCI_EVT_SE_END_OF_APDU_TRANSFER,
 499                                         NULL, 0);
 500                 }
 501                 return r;
 502         }
 503
 504         return 0;
 505 }
 506 EXPORT_SYMBOL_GPL(st_nci_disable_se);
 507
 508 int st_nci_enable_se(struct nci_dev *ndev, u32 se_idx)
 509 {
 510         int r;
 511
 512         pr_debug("st_nci_enable_se\n");
 513
 514         /*
 515          * According to upper layer, se_idx == NFC_SE_UICC when
 516          * info->se_info.se_status->is_uicc_enable is true should never happen.
 517          * Same for eSE.
 518          */
 519         r = st_nci_control_se(ndev, se_idx, ST_NCI_SE_MODE_ON);
 520         if (r == ST_NCI_ESE_HOST_ID) {
 521                 st_nci_se_get_atr(ndev);
 522                 r = nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 523                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 524         }
 525
 526         if (r < 0) {
 527                 /*
 528                  * The activation procedure failed, the secure element
 529                  * is not connected. Remove from the list.
 530                  */
 531                 nfc_remove_se(ndev->nfc_dev, se_idx);
 532                 return r;
 533         }
 534
 535         return 0;
 536 }
 537 EXPORT_SYMBOL_GPL(st_nci_enable_se);
 538
 539 static int st_nci_hci_network_init(struct nci_dev *ndev)
 540 {
 541         struct st_nci_info *info = nci_get_drvdata(ndev);
 542         struct core_conn_create_dest_spec_params *dest_params;
 543         struct dest_spec_params spec_params;
 544         struct nci_conn_info    *conn_info;
 545         int r, dev_num;
 546
 547         dest_params =
 548                 kzalloc(sizeof(struct core_conn_create_dest_spec_params) +
 549                         sizeof(struct dest_spec_params), GFP_KERNEL);
 550         if (dest_params == NULL) {
 551                 r = -ENOMEM;
 552                 goto exit;
 553         }
 554
 555         dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE;
 556         dest_params->length = sizeof(struct dest_spec_params);
 557         spec_params.id = ndev->hci_dev->nfcee_id;
 558         spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS;
 559         memcpy(dest_params->value, &spec_params,
 560                sizeof(struct dest_spec_params));
 561         r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1,
 562                                  sizeof(struct core_conn_create_dest_spec_params) +
 563                                  sizeof(struct dest_spec_params),
 564                                  dest_params);
 565         if (r != NCI_STATUS_OK)
 566                 goto free_dest_params;
 567
 568         conn_info = ndev->hci_dev->conn_info;
 569         if (!conn_info)
 570                 goto free_dest_params;
 571
 572         ndev->hci_dev->init_data.gate_count = ARRAY_SIZE(st_nci_gates);
 573         memcpy(ndev->hci_dev->init_data.gates, st_nci_gates,
 574                sizeof(st_nci_gates));
 575
 576         /*
 577          * Session id must include the driver name + i2c bus addr
 578          * persistent info to discriminate 2 identical chips
 579          */
 580         dev_num = find_first_zero_bit(dev_mask, ST_NCI_NUM_DEVICES);
 581         if (dev_num >= ST_NCI_NUM_DEVICES) {
 582                 r = -ENODEV;
 583                 goto free_dest_params;
 584         }
 585
 586         scnprintf(ndev->hci_dev->init_data.session_id,
 587                   sizeof(ndev->hci_dev->init_data.session_id),
 588                   "%s%2x", "ST21BH", dev_num);
 589
 590         r = nci_hci_dev_session_init(ndev);
 591         if (r != NCI_HCI_ANY_OK)
 592                 goto free_dest_params;
 593
 594         /*
 595          * In factory mode, we prevent secure elements activation
 596          * by disabling nfcee on the current HCI connection id.
 597          * HCI will be used here only for proprietary commands.
 598          */
 599         if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
 600                 r = nci_nfcee_mode_set(ndev,
 601                                        ndev->hci_dev->conn_info->dest_params->id,
 602                                        NCI_NFCEE_DISABLE);
 603         else
 604                 r = nci_nfcee_mode_set(ndev,
 605                                        ndev->hci_dev->conn_info->dest_params->id,
 606                                        NCI_NFCEE_ENABLE);
 607
 608 free_dest_params:
 609         kfree(dest_params);
 610
 611 exit:
 612         return r;
 613 }
 614
 615 int st_nci_discover_se(struct nci_dev *ndev)
 616 {
 617         u8 white_list[2];
 618         int r, wl_size = 0;
 619         int se_count = 0;
 620         struct st_nci_info *info = nci_get_drvdata(ndev);
 621
 622         pr_debug("st_nci_discover_se\n");
 623
 624         r = st_nci_hci_network_init(ndev);
 625         if (r != 0)
 626                 return r;
 627
 628         if (test_bit(ST_NCI_FACTORY_MODE, &info->flags))
 629                 return 0;
 630
 631         if (info->se_info.se_status->is_uicc_present)
 632                 white_list[wl_size++] = ST_NCI_UICC_HOST_ID;
 633         if (info->se_info.se_status->is_ese_present)
 634                 white_list[wl_size++] = ST_NCI_ESE_HOST_ID;
 635
 636         if (wl_size) {
 637                 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
 638                                       NCI_HCI_ADMIN_PARAM_WHITELIST,
 639                                       white_list, wl_size);
 640                 if (r != NCI_HCI_ANY_OK)
 641                         return r;
 642         }
 643
 644         if (info->se_info.se_status->is_uicc_present) {
 645                 nfc_add_se(ndev->nfc_dev, ST_NCI_UICC_HOST_ID, NFC_SE_UICC);
 646                 se_count++;
 647         }
 648
 649         if (info->se_info.se_status->is_ese_present) {
 650                 nfc_add_se(ndev->nfc_dev, ST_NCI_ESE_HOST_ID, NFC_SE_EMBEDDED);
 651                 se_count++;
 652         }
 653
 654         return !se_count;
 655 }
 656 EXPORT_SYMBOL_GPL(st_nci_discover_se);
 657
 658 int st_nci_se_io(struct nci_dev *ndev, u32 se_idx,
 659                        u8 *apdu, size_t apdu_length,
 660                        se_io_cb_t cb, void *cb_context)
 661 {
 662         struct st_nci_info *info = nci_get_drvdata(ndev);
 663
 664         pr_debug("\n");
 665
 666         switch (se_idx) {
 667         case ST_NCI_ESE_HOST_ID:
 668                 info->se_info.cb = cb;
 669                 info->se_info.cb_context = cb_context;
 670                 mod_timer(&info->se_info.bwi_timer, jiffies +
 671                           msecs_to_jiffies(info->se_info.wt_timeout));
 672                 info->se_info.bwi_active = true;
 673                 return nci_hci_send_event(ndev, ST_NCI_APDU_READER_GATE,
 674                                         ST_NCI_EVT_TRANSMIT_DATA, apdu,
 675                                         apdu_length);
 676         default:
 677                 return -ENODEV;
 678         }
 679 }
 680 EXPORT_SYMBOL(st_nci_se_io);
 681
 682 static void st_nci_se_wt_timeout(struct timer_list *t)
 683 {
 684         /*
 685          * No answer from the secure element
 686          * within the defined timeout.
 687          * Let's send a reset request as recovery procedure.
 688          * According to the situation, we first try to send a software reset
 689          * to the secure element. If the next command is still not
 690          * answering in time, we send to the CLF a secure element hardware
 691          * reset request.
 692          */
 693         /* hardware reset managed through VCC_UICC_OUT power supply */
 694         u8 param = 0x01;
 695         struct st_nci_info *info = from_timer(info, t, se_info.bwi_timer);
 696
 697         pr_debug("\n");
 698
 699         info->se_info.bwi_active = false;
 700
 701         if (!info->se_info.xch_error) {
 702                 info->se_info.xch_error = true;
 703                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_APDU_READER_GATE,
 704                                 ST_NCI_EVT_SE_SOFT_RESET, NULL, 0);
 705         } else {
 706                 info->se_info.xch_error = false;
 707                 nci_hci_send_event(info->ndlc->ndev, ST_NCI_DEVICE_MGNT_GATE,
 708                                 ST_NCI_EVT_SE_HARD_RESET, &param, 1);
 709         }
 710         info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME);
 711 }
 712
 713 static void st_nci_se_activation_timeout(struct timer_list *t)
 714 {
 715         struct st_nci_info *info = from_timer(info, t,
 716                                               se_info.se_active_timer);
 717
 718         pr_debug("\n");
 719
 720         info->se_info.se_active = false;
 721
 722         complete(&info->se_info.req_completion);
 723 }
 724
 725 int st_nci_se_init(struct nci_dev *ndev, struct st_nci_se_status *se_status)
 726 {
 727         struct st_nci_info *info = nci_get_drvdata(ndev);
 728
 729         init_completion(&info->se_info.req_completion);
 730         /* initialize timers */
 731         timer_setup(&info->se_info.bwi_timer, st_nci_se_wt_timeout, 0);
 732         info->se_info.bwi_active = false;
 733
 734         timer_setup(&info->se_info.se_active_timer,
 735                     st_nci_se_activation_timeout, 0);
 736         info->se_info.se_active = false;
 737
 738         info->se_info.xch_error = false;
 739
 740         info->se_info.wt_timeout =
 741                 ST_NCI_BWI_TO_TIMEOUT(ST_NCI_ATR_DEFAULT_BWI);
 742
 743         info->se_info.se_status = se_status;
 744
 745         return 0;
 746 }
 747 EXPORT_SYMBOL(st_nci_se_init);
 748
 749 void st_nci_se_deinit(struct nci_dev *ndev)
 750 {
 751         struct st_nci_info *info = nci_get_drvdata(ndev);
 752
 753         if (info->se_info.bwi_active)
 754                 del_timer_sync(&info->se_info.bwi_timer);
 755         if (info->se_info.se_active)
 756                 del_timer_sync(&info->se_info.se_active_timer);
 757
 758         info->se_info.se_active = false;
 759         info->se_info.bwi_active = false;
 760 }
 761 EXPORT_SYMBOL(st_nci_se_deinit);
 762