kernel/drivers/nfc/st21nfca/st21nfca.c

   1 /*
   2  * HCI 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 <net/nfc/hci.h>
  22 #include <net/nfc/llc.h>
  23
  24 #include "st21nfca.h"
  25 #include "st21nfca_dep.h"
  26 #include "st21nfca_se.h"
  27
  28 #define DRIVER_DESC "HCI NFC driver for ST21NFCA"
  29
  30 #define FULL_VERSION_LEN 3
  31
  32 /* Proprietary gates, events, commands and registers */
  33
  34 /* Commands that apply to all RF readers */
  35 #define ST21NFCA_RF_READER_CMD_PRESENCE_CHECK   0x30
  36
  37 #define ST21NFCA_RF_READER_ISO15693_GATE        0x12
  38 #define ST21NFCA_RF_READER_ISO15693_INVENTORY   0x01
  39
  40 /*
  41  * Reader gate for communication with contact-less cards using Type A
  42  * protocol ISO14443-3 but not compliant with ISO14443-4
  43  */
  44 #define ST21NFCA_RF_READER_14443_3_A_GATE       0x15
  45 #define ST21NFCA_RF_READER_14443_3_A_UID        0x02
  46 #define ST21NFCA_RF_READER_14443_3_A_ATQA       0x03
  47 #define ST21NFCA_RF_READER_14443_3_A_SAK        0x04
  48
  49 #define ST21NFCA_RF_READER_F_DATARATE           0x01
  50 #define ST21NFCA_RF_READER_F_DATARATE_106       0x01
  51 #define ST21NFCA_RF_READER_F_DATARATE_212       0x02
  52 #define ST21NFCA_RF_READER_F_DATARATE_424       0x04
  53 #define ST21NFCA_RF_READER_F_POL_REQ            0x02
  54 #define ST21NFCA_RF_READER_F_POL_REQ_DEFAULT    0xffff0000
  55 #define ST21NFCA_RF_READER_F_NFCID2             0x03
  56 #define ST21NFCA_RF_READER_F_NFCID1             0x04
  57
  58 #define ST21NFCA_RF_CARD_F_MODE                 0x01
  59 #define ST21NFCA_RF_CARD_F_NFCID2_LIST          0x04
  60 #define ST21NFCA_RF_CARD_F_NFCID1               0x05
  61 #define ST21NFCA_RF_CARD_F_SENS_RES             0x06
  62 #define ST21NFCA_RF_CARD_F_SEL_RES              0x07
  63 #define ST21NFCA_RF_CARD_F_DATARATE             0x08
  64 #define ST21NFCA_RF_CARD_F_DATARATE_212_424     0x01
  65
  66 #define ST21NFCA_DEVICE_MGNT_PIPE               0x02
  67
  68 #define ST21NFCA_DM_GETINFO                     0x13
  69 #define ST21NFCA_DM_GETINFO_PIPE_LIST           0x02
  70 #define ST21NFCA_DM_GETINFO_PIPE_INFO           0x01
  71 #define ST21NFCA_DM_PIPE_CREATED                0x02
  72 #define ST21NFCA_DM_PIPE_OPEN                   0x04
  73 #define ST21NFCA_DM_RF_ACTIVE                   0x80
  74 #define ST21NFCA_DM_DISCONNECT                  0x30
  75
  76 #define ST21NFCA_DM_IS_PIPE_OPEN(p) \
  77         ((p & 0x0f) == (ST21NFCA_DM_PIPE_CREATED | ST21NFCA_DM_PIPE_OPEN))
  78
  79 #define ST21NFCA_NFC_MODE                       0x03    /* NFC_MODE parameter*/
  80
  81 #define ST21NFCA_EVT_HOT_PLUG                   0x03
  82 #define ST21NFCA_EVT_HOT_PLUG_IS_INHIBITED(x) (x->data[0] & 0x80)
  83
  84 #define ST21NFCA_SE_TO_PIPES                    2000
  85
  86 static DECLARE_BITMAP(dev_mask, ST21NFCA_NUM_DEVICES);
  87
  88 static struct nfc_hci_gate st21nfca_gates[] = {
  89         {NFC_HCI_ADMIN_GATE, NFC_HCI_ADMIN_PIPE},
  90         {NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE},
  91         {NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_PIPE},
  92         {NFC_HCI_LINK_MGMT_GATE, NFC_HCI_LINK_MGMT_PIPE},
  93         {NFC_HCI_RF_READER_B_GATE, NFC_HCI_INVALID_PIPE},
  94         {NFC_HCI_RF_READER_A_GATE, NFC_HCI_INVALID_PIPE},
  95         {ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_DEVICE_MGNT_PIPE},
  96         {ST21NFCA_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE},
  97         {ST21NFCA_RF_READER_14443_3_A_GATE, NFC_HCI_INVALID_PIPE},
  98         {ST21NFCA_RF_READER_ISO15693_GATE, NFC_HCI_INVALID_PIPE},
  99         {ST21NFCA_RF_CARD_F_GATE, NFC_HCI_INVALID_PIPE},
 100
 101         /* Secure element pipes are created by secure element host */
 102         {ST21NFCA_CONNECTIVITY_GATE, NFC_HCI_DO_NOT_CREATE_PIPE},
 103         {ST21NFCA_APDU_READER_GATE, NFC_HCI_DO_NOT_CREATE_PIPE},
 104 };
 105
 106 struct st21nfca_pipe_info {
 107         u8 pipe_state;
 108         u8 src_host_id;
 109         u8 src_gate_id;
 110         u8 dst_host_id;
 111         u8 dst_gate_id;
 112 } __packed;
 113
 114 /* Largest headroom needed for outgoing custom commands */
 115 #define ST21NFCA_CMDS_HEADROOM  7
 116
 117 static int st21nfca_hci_load_session(struct nfc_hci_dev *hdev)
 118 {
 119         int i, j, r;
 120         struct sk_buff *skb_pipe_list, *skb_pipe_info;
 121         struct st21nfca_pipe_info *info;
 122
 123         u8 pipe_list[] = { ST21NFCA_DM_GETINFO_PIPE_LIST,
 124                 NFC_HCI_TERMINAL_HOST_ID
 125         };
 126         u8 pipe_info[] = { ST21NFCA_DM_GETINFO_PIPE_INFO,
 127                 NFC_HCI_TERMINAL_HOST_ID, 0
 128         };
 129
 130         /* On ST21NFCA device pipes number are dynamics
 131          * A maximum of 16 pipes can be created at the same time
 132          * If pipes are already created, hci_dev_up will fail.
 133          * Doing a clear all pipe is a bad idea because:
 134          * - It does useless EEPROM cycling
 135          * - It might cause issue for secure elements support
 136          * (such as removing connectivity or APDU reader pipe)
 137          * A better approach on ST21NFCA is to:
 138          * - get a pipe list for each host.
 139          * (eg: NFC_HCI_HOST_CONTROLLER_ID for now).
 140          * (TODO Later on UICC HOST and eSE HOST)
 141          * - get pipe information
 142          * - match retrieved pipe list in st21nfca_gates
 143          * ST21NFCA_DEVICE_MGNT_GATE is a proprietary gate
 144          * with ST21NFCA_DEVICE_MGNT_PIPE.
 145          * Pipe can be closed and need to be open.
 146          */
 147         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 148                                 ST21NFCA_DEVICE_MGNT_GATE,
 149                                 ST21NFCA_DEVICE_MGNT_PIPE);
 150         if (r < 0)
 151                 goto free_info;
 152
 153         /* Get pipe list */
 154         r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 155                         ST21NFCA_DM_GETINFO, pipe_list, sizeof(pipe_list),
 156                         &skb_pipe_list);
 157         if (r < 0)
 158                 goto free_info;
 159
 160         /* Complete the existing gate_pipe table */
 161         for (i = 0; i < skb_pipe_list->len; i++) {
 162                 pipe_info[2] = skb_pipe_list->data[i];
 163                 r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 164                                         ST21NFCA_DM_GETINFO, pipe_info,
 165                                         sizeof(pipe_info), &skb_pipe_info);
 166
 167                 if (r)
 168                         continue;
 169
 170                 /*
 171                  * Match pipe ID and gate ID
 172                  * Output format from ST21NFC_DM_GETINFO is:
 173                  * - pipe state (1byte)
 174                  * - source hid (1byte)
 175                  * - source gid (1byte)
 176                  * - destination hid (1byte)
 177                  * - destination gid (1byte)
 178                  */
 179                 info = (struct st21nfca_pipe_info *) skb_pipe_info->data;
 180                 if (info->dst_gate_id == ST21NFCA_APDU_READER_GATE &&
 181                         info->src_host_id != ST21NFCA_ESE_HOST_ID) {
 182                         pr_err("Unexpected apdu_reader pipe on host %x\n",
 183                                 info->src_host_id);
 184                         continue;
 185                 }
 186
 187                 for (j = 0; (j < ARRAY_SIZE(st21nfca_gates)) &&
 188                         (st21nfca_gates[j].gate != info->dst_gate_id) ; j++)
 189                         ;
 190
 191                 if (j < ARRAY_SIZE(st21nfca_gates) &&
 192                         st21nfca_gates[j].gate == info->dst_gate_id &&
 193                         ST21NFCA_DM_IS_PIPE_OPEN(info->pipe_state)) {
 194                         st21nfca_gates[j].pipe = pipe_info[2];
 195
 196                         hdev->gate2pipe[st21nfca_gates[j].gate] =
 197                                                         st21nfca_gates[j].pipe;
 198                         hdev->pipes[st21nfca_gates[j].pipe].gate =
 199                                                         st21nfca_gates[j].gate;
 200                         hdev->pipes[st21nfca_gates[j].pipe].dest_host =
 201                                                         info->src_host_id;
 202                 }
 203         }
 204
 205         /*
 206          * 3 gates have a well known pipe ID.
 207          * They will never appear in the pipe list
 208          */
 209         if (skb_pipe_list->len + 3 < ARRAY_SIZE(st21nfca_gates)) {
 210                 for (i = skb_pipe_list->len + 3;
 211                                 i < ARRAY_SIZE(st21nfca_gates) - 2; i++) {
 212                         r = nfc_hci_connect_gate(hdev,
 213                                         NFC_HCI_HOST_CONTROLLER_ID,
 214                                         st21nfca_gates[i].gate,
 215                                         st21nfca_gates[i].pipe);
 216                         if (r < 0)
 217                                 goto free_info;
 218                 }
 219         }
 220
 221         memcpy(hdev->init_data.gates, st21nfca_gates, sizeof(st21nfca_gates));
 222 free_info:
 223         kfree_skb(skb_pipe_info);
 224         kfree_skb(skb_pipe_list);
 225         return r;
 226 }
 227
 228 static int st21nfca_hci_open(struct nfc_hci_dev *hdev)
 229 {
 230         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 231         int r;
 232
 233         mutex_lock(&info->info_lock);
 234
 235         if (info->state != ST21NFCA_ST_COLD) {
 236                 r = -EBUSY;
 237                 goto out;
 238         }
 239
 240         r = info->phy_ops->enable(info->phy_id);
 241
 242         if (r == 0)
 243                 info->state = ST21NFCA_ST_READY;
 244
 245 out:
 246         mutex_unlock(&info->info_lock);
 247         return r;
 248 }
 249
 250 static void st21nfca_hci_close(struct nfc_hci_dev *hdev)
 251 {
 252         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 253
 254         mutex_lock(&info->info_lock);
 255
 256         if (info->state == ST21NFCA_ST_COLD)
 257                 goto out;
 258
 259         info->phy_ops->disable(info->phy_id);
 260         info->state = ST21NFCA_ST_COLD;
 261
 262 out:
 263         mutex_unlock(&info->info_lock);
 264 }
 265
 266 static int st21nfca_hci_ready(struct nfc_hci_dev *hdev)
 267 {
 268         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 269         struct sk_buff *skb;
 270
 271         u8 param;
 272         u8 white_list[2];
 273         int wl_size = 0;
 274         int r;
 275
 276         if (info->se_status->is_ese_present &&
 277                 info->se_status->is_uicc_present) {
 278                 white_list[wl_size++] = NFC_HCI_UICC_HOST_ID;
 279                 white_list[wl_size++] = ST21NFCA_ESE_HOST_ID;
 280         } else if (!info->se_status->is_ese_present &&
 281                          info->se_status->is_uicc_present) {
 282                 white_list[wl_size++] = NFC_HCI_UICC_HOST_ID;
 283         } else if (info->se_status->is_ese_present &&
 284                         !info->se_status->is_uicc_present) {
 285                 white_list[wl_size++] = ST21NFCA_ESE_HOST_ID;
 286         }
 287
 288         if (wl_size) {
 289                 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 290                                         NFC_HCI_ADMIN_WHITELIST,
 291                                         (u8 *) &white_list, wl_size);
 292                 if (r < 0)
 293                         return r;
 294         }
 295
 296         /* Set NFC_MODE in device management gate to enable */
 297         r = nfc_hci_get_param(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 298                               ST21NFCA_NFC_MODE, &skb);
 299         if (r < 0)
 300                 return r;
 301
 302         param = skb->data[0];
 303         kfree_skb(skb);
 304         if (param == 0) {
 305                 param = 1;
 306
 307                 r = nfc_hci_set_param(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 308                                         ST21NFCA_NFC_MODE, &param, 1);
 309                 if (r < 0)
 310                         return r;
 311         }
 312
 313         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 314                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 315         if (r < 0)
 316                 return r;
 317
 318         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 319                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 320         if (r < 0)
 321                 return r;
 322
 323         if (skb->len != FULL_VERSION_LEN) {
 324                 kfree_skb(skb);
 325                 return -EINVAL;
 326         }
 327
 328         print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
 329                        DUMP_PREFIX_NONE, 16, 1,
 330                        skb->data, FULL_VERSION_LEN, false);
 331
 332         kfree_skb(skb);
 333
 334         return 0;
 335 }
 336
 337 static int st21nfca_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 338 {
 339         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 340
 341         return info->phy_ops->write(info->phy_id, skb);
 342 }
 343
 344 static int st21nfca_hci_start_poll(struct nfc_hci_dev *hdev,
 345                                    u32 im_protocols, u32 tm_protocols)
 346 {
 347         int r;
 348         u32 pol_req;
 349         u8 param[19];
 350         struct sk_buff *datarate_skb;
 351
 352         pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n",
 353                 __func__, im_protocols, tm_protocols);
 354
 355         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 356                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 357         if (r < 0)
 358                 return r;
 359         if (im_protocols) {
 360                 /*
 361                  * enable polling according to im_protocols & tm_protocols
 362                  * - CLOSE pipe according to im_protocols & tm_protocols
 363                  */
 364                 if ((NFC_HCI_RF_READER_B_GATE & im_protocols) == 0) {
 365                         r = nfc_hci_disconnect_gate(hdev,
 366                                         NFC_HCI_RF_READER_B_GATE);
 367                         if (r < 0)
 368                                 return r;
 369                 }
 370
 371                 if ((NFC_HCI_RF_READER_A_GATE & im_protocols) == 0) {
 372                         r = nfc_hci_disconnect_gate(hdev,
 373                                         NFC_HCI_RF_READER_A_GATE);
 374                         if (r < 0)
 375                                 return r;
 376                 }
 377
 378                 if ((ST21NFCA_RF_READER_F_GATE & im_protocols) == 0) {
 379                         r = nfc_hci_disconnect_gate(hdev,
 380                                         ST21NFCA_RF_READER_F_GATE);
 381                         if (r < 0)
 382                                 return r;
 383                 } else {
 384                         hdev->gb = nfc_get_local_general_bytes(hdev->ndev,
 385                                                                &hdev->gb_len);
 386
 387                         if (hdev->gb == NULL || hdev->gb_len == 0) {
 388                                 im_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
 389                                 tm_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
 390                         }
 391
 392                         param[0] = ST21NFCA_RF_READER_F_DATARATE_106 |
 393                             ST21NFCA_RF_READER_F_DATARATE_212 |
 394                             ST21NFCA_RF_READER_F_DATARATE_424;
 395                         r = nfc_hci_set_param(hdev, ST21NFCA_RF_READER_F_GATE,
 396                                               ST21NFCA_RF_READER_F_DATARATE,
 397                                               param, 1);
 398                         if (r < 0)
 399                                 return r;
 400
 401                         pol_req = be32_to_cpu((__force __be32)
 402                                         ST21NFCA_RF_READER_F_POL_REQ_DEFAULT);
 403                         r = nfc_hci_set_param(hdev, ST21NFCA_RF_READER_F_GATE,
 404                                               ST21NFCA_RF_READER_F_POL_REQ,
 405                                               (u8 *) &pol_req, 4);
 406                         if (r < 0)
 407                                 return r;
 408                 }
 409
 410                 if ((ST21NFCA_RF_READER_14443_3_A_GATE & im_protocols) == 0) {
 411                         r = nfc_hci_disconnect_gate(hdev,
 412                                         ST21NFCA_RF_READER_14443_3_A_GATE);
 413                         if (r < 0)
 414                                 return r;
 415                 }
 416
 417                 if ((ST21NFCA_RF_READER_ISO15693_GATE & im_protocols) == 0) {
 418                         r = nfc_hci_disconnect_gate(hdev,
 419                                         ST21NFCA_RF_READER_ISO15693_GATE);
 420                         if (r < 0)
 421                                 return r;
 422                 }
 423
 424                 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 425                                        NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
 426                 if (r < 0)
 427                         nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 428                                            NFC_HCI_EVT_END_OPERATION, NULL, 0);
 429         }
 430
 431         if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
 432                 r = nfc_hci_get_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 433                                       ST21NFCA_RF_CARD_F_DATARATE,
 434                                       &datarate_skb);
 435                 if (r < 0)
 436                         return r;
 437
 438                 /* Configure the maximum supported datarate to 424Kbps */
 439                 if (datarate_skb->len > 0 &&
 440                     datarate_skb->data[0] !=
 441                     ST21NFCA_RF_CARD_F_DATARATE_212_424) {
 442                         param[0] = ST21NFCA_RF_CARD_F_DATARATE_212_424;
 443                         r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 444                                               ST21NFCA_RF_CARD_F_DATARATE,
 445                                               param, 1);
 446                         if (r < 0) {
 447                                 kfree_skb(datarate_skb);
 448                                 return r;
 449                         }
 450                 }
 451                 kfree_skb(datarate_skb);
 452
 453                 /*
 454                  * Configure sens_res
 455                  *
 456                  * NFC Forum Digital Spec Table 7:
 457                  * NFCID1 size: triple (10 bytes)
 458                  */
 459                 param[0] = 0x00;
 460                 param[1] = 0x08;
 461                 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 462                                       ST21NFCA_RF_CARD_F_SENS_RES, param, 2);
 463                 if (r < 0)
 464                         return r;
 465
 466                 /*
 467                  * Configure sel_res
 468                  *
 469                  * NFC Forum Digistal Spec Table 17:
 470                  * b3 set to 0b (value b7-b6):
 471                  * - 10b: Configured for NFC-DEP Protocol
 472                  */
 473                 param[0] = 0x40;
 474                 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 475                                       ST21NFCA_RF_CARD_F_SEL_RES, param, 1);
 476                 if (r < 0)
 477                         return r;
 478
 479                 /* Configure NFCID1 Random uid */
 480                 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 481                                       ST21NFCA_RF_CARD_F_NFCID1, NULL, 0);
 482                 if (r < 0)
 483                         return r;
 484
 485                 /* Configure NFCID2_LIST */
 486                 /* System Code */
 487                 param[0] = 0x00;
 488                 param[1] = 0x00;
 489                 /* NFCID2 */
 490                 param[2] = 0x01;
 491                 param[3] = 0xfe;
 492                 param[4] = 'S';
 493                 param[5] = 'T';
 494                 param[6] = 'M';
 495                 param[7] = 'i';
 496                 param[8] = 'c';
 497                 param[9] = 'r';
 498                 /* 8 byte Pad bytes used for polling respone frame */
 499
 500                 /*
 501                  * Configuration byte:
 502                  * - bit 0: define the default NFCID2 entry used when the
 503                  * system code is equal to 'FFFF'
 504                  * - bit 1: use a random value for lowest 6 bytes of
 505                  * NFCID2 value
 506                  * - bit 2: ignore polling request frame if request code
 507                  * is equal to '01'
 508                  * - Other bits are RFU
 509                  */
 510                 param[18] = 0x01;
 511                 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 512                                       ST21NFCA_RF_CARD_F_NFCID2_LIST, param,
 513                                       19);
 514                 if (r < 0)
 515                         return r;
 516
 517                 param[0] = 0x02;
 518                 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 519                                       ST21NFCA_RF_CARD_F_MODE, param, 1);
 520         }
 521
 522         return r;
 523 }
 524
 525 static void st21nfca_hci_stop_poll(struct nfc_hci_dev *hdev)
 526 {
 527         nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 528                         ST21NFCA_DM_DISCONNECT, NULL, 0, NULL);
 529 }
 530
 531 static int st21nfca_get_iso14443_3_atqa(struct nfc_hci_dev *hdev, u16 *atqa)
 532 {
 533         int r;
 534         struct sk_buff *atqa_skb = NULL;
 535
 536         r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
 537                               ST21NFCA_RF_READER_14443_3_A_ATQA, &atqa_skb);
 538         if (r < 0)
 539                 goto exit;
 540
 541         if (atqa_skb->len != 2) {
 542                 r = -EPROTO;
 543                 goto exit;
 544         }
 545
 546         *atqa = be16_to_cpu(*(__be16 *) atqa_skb->data);
 547
 548 exit:
 549         kfree_skb(atqa_skb);
 550         return r;
 551 }
 552
 553 static int st21nfca_get_iso14443_3_sak(struct nfc_hci_dev *hdev, u8 *sak)
 554 {
 555         int r;
 556         struct sk_buff *sak_skb = NULL;
 557
 558         r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
 559                               ST21NFCA_RF_READER_14443_3_A_SAK, &sak_skb);
 560         if (r < 0)
 561                 goto exit;
 562
 563         if (sak_skb->len != 1) {
 564                 r = -EPROTO;
 565                 goto exit;
 566         }
 567
 568         *sak = sak_skb->data[0];
 569
 570 exit:
 571         kfree_skb(sak_skb);
 572         return r;
 573 }
 574
 575 static int st21nfca_get_iso14443_3_uid(struct nfc_hci_dev *hdev, u8 *uid,
 576                                        int *len)
 577 {
 578         int r;
 579         struct sk_buff *uid_skb = NULL;
 580
 581         r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
 582                               ST21NFCA_RF_READER_14443_3_A_UID, &uid_skb);
 583         if (r < 0)
 584                 goto exit;
 585
 586         if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
 587                 r = -EPROTO;
 588                 goto exit;
 589         }
 590
 591         memcpy(uid, uid_skb->data, uid_skb->len);
 592         *len = uid_skb->len;
 593 exit:
 594         kfree_skb(uid_skb);
 595         return r;
 596 }
 597
 598 static int st21nfca_get_iso15693_inventory(struct nfc_hci_dev *hdev,
 599                                            struct nfc_target *target)
 600 {
 601         int r;
 602         struct sk_buff *inventory_skb = NULL;
 603
 604         r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_ISO15693_GATE,
 605                               ST21NFCA_RF_READER_ISO15693_INVENTORY,
 606                               &inventory_skb);
 607         if (r < 0)
 608                 goto exit;
 609
 610         skb_pull(inventory_skb, 2);
 611
 612         if (inventory_skb->len == 0 ||
 613             inventory_skb->len > NFC_ISO15693_UID_MAXSIZE) {
 614                 r = -EPROTO;
 615                 goto exit;
 616         }
 617
 618         memcpy(target->iso15693_uid, inventory_skb->data, inventory_skb->len);
 619         target->iso15693_dsfid  = inventory_skb->data[1];
 620         target->is_iso15693 = 1;
 621 exit:
 622         kfree_skb(inventory_skb);
 623         return r;
 624 }
 625
 626 static int st21nfca_hci_dep_link_up(struct nfc_hci_dev *hdev,
 627                                     struct nfc_target *target, u8 comm_mode,
 628                                     u8 *gb, size_t gb_len)
 629 {
 630         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 631
 632         info->dep_info.idx = target->idx;
 633         return st21nfca_im_send_atr_req(hdev, gb, gb_len);
 634 }
 635
 636 static int st21nfca_hci_dep_link_down(struct nfc_hci_dev *hdev)
 637 {
 638         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 639
 640         info->state = ST21NFCA_ST_READY;
 641
 642         return nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 643                                 ST21NFCA_DM_DISCONNECT, NULL, 0, NULL);
 644 }
 645
 646 static int st21nfca_hci_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
 647                                          struct nfc_target *target)
 648 {
 649         int r, len;
 650         u16 atqa;
 651         u8 sak;
 652         u8 uid[NFC_NFCID1_MAXSIZE];
 653
 654         switch (gate) {
 655         case ST21NFCA_RF_READER_F_GATE:
 656                 target->supported_protocols = NFC_PROTO_FELICA_MASK;
 657                 break;
 658         case ST21NFCA_RF_READER_14443_3_A_GATE:
 659                 /* ISO14443-3 type 1 or 2 tags */
 660                 r = st21nfca_get_iso14443_3_atqa(hdev, &atqa);
 661                 if (r < 0)
 662                         return r;
 663                 if (atqa == 0x000c) {
 664                         target->supported_protocols = NFC_PROTO_JEWEL_MASK;
 665                         target->sens_res = 0x0c00;
 666                 } else {
 667                         r = st21nfca_get_iso14443_3_sak(hdev, &sak);
 668                         if (r < 0)
 669                                 return r;
 670
 671                         r = st21nfca_get_iso14443_3_uid(hdev, uid, &len);
 672                         if (r < 0)
 673                                 return r;
 674
 675                         target->supported_protocols =
 676                             nfc_hci_sak_to_protocol(sak);
 677                         if (target->supported_protocols == 0xffffffff)
 678                                 return -EPROTO;
 679
 680                         target->sens_res = atqa;
 681                         target->sel_res = sak;
 682                         memcpy(target->nfcid1, uid, len);
 683                         target->nfcid1_len = len;
 684                 }
 685
 686                 break;
 687         case ST21NFCA_RF_READER_ISO15693_GATE:
 688                 target->supported_protocols = NFC_PROTO_ISO15693_MASK;
 689                 r = st21nfca_get_iso15693_inventory(hdev, target);
 690                 if (r < 0)
 691                         return r;
 692                 break;
 693         default:
 694                 return -EPROTO;
 695         }
 696
 697         return 0;
 698 }
 699
 700 static int st21nfca_hci_complete_target_discovered(struct nfc_hci_dev *hdev,
 701                                                 u8 gate,
 702                                                 struct nfc_target *target)
 703 {
 704         int r;
 705         struct sk_buff *nfcid_skb = NULL;
 706
 707         if (gate == ST21NFCA_RF_READER_F_GATE) {
 708                 r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_F_GATE,
 709                                 ST21NFCA_RF_READER_F_NFCID2, &nfcid_skb);
 710                 if (r < 0)
 711                         goto exit;
 712
 713                 if (nfcid_skb->len > NFC_SENSF_RES_MAXSIZE) {
 714                         r = -EPROTO;
 715                         goto exit;
 716                 }
 717
 718                 /*
 719                  * - After the recepton of polling response for type F frame
 720                  * at 212 or 424 Kbit/s, NFCID2 registry parameters will be
 721                  * updated.
 722                  * - After the reception of SEL_RES with NFCIP-1 compliant bit
 723                  * set for type A frame NFCID1 will be updated
 724                  */
 725                 if (nfcid_skb->len > 0) {
 726                         /* P2P in type F */
 727                         memcpy(target->sensf_res, nfcid_skb->data,
 728                                 nfcid_skb->len);
 729                         target->sensf_res_len = nfcid_skb->len;
 730                         /* NFC Forum Digital Protocol Table 44 */
 731                         if (target->sensf_res[0] == 0x01 &&
 732                             target->sensf_res[1] == 0xfe)
 733                                 target->supported_protocols =
 734                                                         NFC_PROTO_NFC_DEP_MASK;
 735                         else
 736                                 target->supported_protocols =
 737                                                         NFC_PROTO_FELICA_MASK;
 738                 } else {
 739                         kfree_skb(nfcid_skb);
 740                         /* P2P in type A */
 741                         r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_F_GATE,
 742                                         ST21NFCA_RF_READER_F_NFCID1,
 743                                         &nfcid_skb);
 744                         if (r < 0)
 745                                 goto exit;
 746
 747                         if (nfcid_skb->len > NFC_NFCID1_MAXSIZE) {
 748                                 r = -EPROTO;
 749                                 goto exit;
 750                         }
 751                         memcpy(target->sensf_res, nfcid_skb->data,
 752                                 nfcid_skb->len);
 753                         target->sensf_res_len = nfcid_skb->len;
 754                         target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 755                 }
 756                 target->hci_reader_gate = ST21NFCA_RF_READER_F_GATE;
 757         }
 758         r = 1;
 759 exit:
 760         kfree_skb(nfcid_skb);
 761         return r;
 762 }
 763
 764 #define ST21NFCA_CB_TYPE_READER_ISO15693 1
 765 static void st21nfca_hci_data_exchange_cb(void *context, struct sk_buff *skb,
 766                                           int err)
 767 {
 768         struct st21nfca_hci_info *info = context;
 769
 770         switch (info->async_cb_type) {
 771         case ST21NFCA_CB_TYPE_READER_ISO15693:
 772                 if (err == 0)
 773                         skb_trim(skb, skb->len - 1);
 774                 info->async_cb(info->async_cb_context, skb, err);
 775                 break;
 776         default:
 777                 if (err == 0)
 778                         kfree_skb(skb);
 779                 break;
 780         }
 781 }
 782
 783 /*
 784  * Returns:
 785  * <= 0: driver handled the data exchange
 786  *    1: driver doesn't especially handle, please do standard processing
 787  */
 788 static int st21nfca_hci_im_transceive(struct nfc_hci_dev *hdev,
 789                                       struct nfc_target *target,
 790                                       struct sk_buff *skb,
 791                                       data_exchange_cb_t cb, void *cb_context)
 792 {
 793         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 794
 795         pr_info(DRIVER_DESC ": %s for gate=%d len=%d\n", __func__,
 796                 target->hci_reader_gate, skb->len);
 797
 798         switch (target->hci_reader_gate) {
 799         case ST21NFCA_RF_READER_F_GATE:
 800                 if (target->supported_protocols == NFC_PROTO_NFC_DEP_MASK)
 801                         return st21nfca_im_send_dep_req(hdev, skb);
 802
 803                 *skb_push(skb, 1) = 0x1a;
 804                 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 805                                               ST21NFCA_WR_XCHG_DATA, skb->data,
 806                                               skb->len, cb, cb_context);
 807         case ST21NFCA_RF_READER_14443_3_A_GATE:
 808                 *skb_push(skb, 1) = 0x1a;       /* CTR, see spec:10.2.2.1 */
 809
 810                 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 811                                               ST21NFCA_WR_XCHG_DATA, skb->data,
 812                                               skb->len, cb, cb_context);
 813         case ST21NFCA_RF_READER_ISO15693_GATE:
 814                 info->async_cb_type = ST21NFCA_CB_TYPE_READER_ISO15693;
 815                 info->async_cb = cb;
 816                 info->async_cb_context = cb_context;
 817
 818                 *skb_push(skb, 1) = 0x17;
 819
 820                 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 821                                               ST21NFCA_WR_XCHG_DATA, skb->data,
 822                                               skb->len,
 823                                               st21nfca_hci_data_exchange_cb,
 824                                               info);
 825                 break;
 826         default:
 827                 return 1;
 828         }
 829 }
 830
 831 static int st21nfca_hci_tm_send(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 832 {
 833         return st21nfca_tm_send_dep_res(hdev, skb);
 834 }
 835
 836 static int st21nfca_hci_check_presence(struct nfc_hci_dev *hdev,
 837                                        struct nfc_target *target)
 838 {
 839         u8 fwi = 0x11;
 840
 841         switch (target->hci_reader_gate) {
 842         case NFC_HCI_RF_READER_A_GATE:
 843         case NFC_HCI_RF_READER_B_GATE:
 844                 /*
 845                  * PRESENCE_CHECK on those gates is available
 846                  * However, the answer to this command is taking 3 * fwi
 847                  * if the card is no present.
 848                  * Instead, we send an empty I-Frame with a very short
 849                  * configurable fwi ~604µs.
 850                  */
 851                 return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
 852                                         ST21NFCA_WR_XCHG_DATA, &fwi, 1, NULL);
 853         case ST21NFCA_RF_READER_14443_3_A_GATE:
 854                 return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
 855                                         ST21NFCA_RF_READER_CMD_PRESENCE_CHECK,
 856                                         NULL, 0, NULL);
 857         default:
 858                 return -EOPNOTSUPP;
 859         }
 860 }
 861
 862 static void st21nfca_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
 863                                 struct sk_buff *skb)
 864 {
 865         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 866         u8 gate = hdev->pipes[pipe].gate;
 867
 868         pr_debug("cmd: %x\n", cmd);
 869
 870         switch (cmd) {
 871         case NFC_HCI_ANY_OPEN_PIPE:
 872                 if (gate != ST21NFCA_APDU_READER_GATE &&
 873                         hdev->pipes[pipe].dest_host != NFC_HCI_UICC_HOST_ID)
 874                         info->se_info.count_pipes++;
 875
 876                 if (info->se_info.count_pipes == info->se_info.expected_pipes) {
 877                         del_timer_sync(&info->se_info.se_active_timer);
 878                         info->se_info.se_active = false;
 879                         info->se_info.count_pipes = 0;
 880                         complete(&info->se_info.req_completion);
 881                 }
 882         break;
 883         }
 884 }
 885
 886 static int st21nfca_admin_event_received(struct nfc_hci_dev *hdev, u8 event,
 887                                         struct sk_buff *skb)
 888 {
 889         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 890
 891         pr_debug("admin event: %x\n", event);
 892
 893         switch (event) {
 894         case ST21NFCA_EVT_HOT_PLUG:
 895                 if (info->se_info.se_active) {
 896                         if (!ST21NFCA_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
 897                                 del_timer_sync(&info->se_info.se_active_timer);
 898                                 info->se_info.se_active = false;
 899                                 complete(&info->se_info.req_completion);
 900                         } else {
 901                                 mod_timer(&info->se_info.se_active_timer,
 902                                         jiffies +
 903                                         msecs_to_jiffies(ST21NFCA_SE_TO_PIPES));
 904                         }
 905                 }
 906         break;
 907         }
 908         kfree_skb(skb);
 909         return 0;
 910 }
 911
 912 /*
 913  * Returns:
 914  * <= 0: driver handled the event, skb consumed
 915  *    1: driver does not handle the event, please do standard processing
 916  */
 917 static int st21nfca_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe,
 918                                        u8 event, struct sk_buff *skb)
 919 {
 920         u8 gate = hdev->pipes[pipe].gate;
 921         u8 host = hdev->pipes[pipe].dest_host;
 922
 923         pr_debug("hci event: %d gate: %x\n", event, gate);
 924
 925         switch (gate) {
 926         case NFC_HCI_ADMIN_GATE:
 927                 return st21nfca_admin_event_received(hdev, event, skb);
 928         case ST21NFCA_RF_CARD_F_GATE:
 929                 return st21nfca_dep_event_received(hdev, event, skb);
 930         case ST21NFCA_CONNECTIVITY_GATE:
 931                 return st21nfca_connectivity_event_received(hdev, host,
 932                                                         event, skb);
 933         case ST21NFCA_APDU_READER_GATE:
 934                 return st21nfca_apdu_reader_event_received(hdev, event, skb);
 935         default:
 936                 return 1;
 937         }
 938 }
 939
 940 static struct nfc_hci_ops st21nfca_hci_ops = {
 941         .open = st21nfca_hci_open,
 942         .close = st21nfca_hci_close,
 943         .load_session = st21nfca_hci_load_session,
 944         .hci_ready = st21nfca_hci_ready,
 945         .xmit = st21nfca_hci_xmit,
 946         .start_poll = st21nfca_hci_start_poll,
 947         .stop_poll = st21nfca_hci_stop_poll,
 948         .dep_link_up = st21nfca_hci_dep_link_up,
 949         .dep_link_down = st21nfca_hci_dep_link_down,
 950         .target_from_gate = st21nfca_hci_target_from_gate,
 951         .complete_target_discovered = st21nfca_hci_complete_target_discovered,
 952         .im_transceive = st21nfca_hci_im_transceive,
 953         .tm_send = st21nfca_hci_tm_send,
 954         .check_presence = st21nfca_hci_check_presence,
 955         .event_received = st21nfca_hci_event_received,
 956         .cmd_received = st21nfca_hci_cmd_received,
 957         .discover_se = st21nfca_hci_discover_se,
 958         .enable_se = st21nfca_hci_enable_se,
 959         .disable_se = st21nfca_hci_disable_se,
 960         .se_io = st21nfca_hci_se_io,
 961 };
 962
 963 int st21nfca_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops,
 964                        char *llc_name, int phy_headroom, int phy_tailroom,
 965                        int phy_payload, struct nfc_hci_dev **hdev,
 966                            struct st21nfca_se_status *se_status)
 967 {
 968         struct st21nfca_hci_info *info;
 969         int r = 0;
 970         int dev_num;
 971         u32 protocols;
 972         struct nfc_hci_init_data init_data;
 973         unsigned long quirks = 0;
 974
 975         info = kzalloc(sizeof(struct st21nfca_hci_info), GFP_KERNEL);
 976         if (!info) {
 977                 r = -ENOMEM;
 978                 goto err_alloc_hdev;
 979         }
 980
 981         info->phy_ops = phy_ops;
 982         info->phy_id = phy_id;
 983         info->state = ST21NFCA_ST_COLD;
 984         mutex_init(&info->info_lock);
 985
 986         init_data.gate_count = ARRAY_SIZE(st21nfca_gates);
 987
 988         memcpy(init_data.gates, st21nfca_gates, sizeof(st21nfca_gates));
 989
 990         /*
 991          * Session id must include the driver name + i2c bus addr
 992          * persistent info to discriminate 2 identical chips
 993          */
 994         dev_num = find_first_zero_bit(dev_mask, ST21NFCA_NUM_DEVICES);
 995
 996         if (dev_num >= ST21NFCA_NUM_DEVICES)
 997                 return -ENODEV;
 998
 999         set_bit(dev_num, dev_mask);
1000
1001         scnprintf(init_data.session_id, sizeof(init_data.session_id), "%s%2x",
1002                   "ST21AH", dev_num);
1003
1004         protocols = NFC_PROTO_JEWEL_MASK |
1005             NFC_PROTO_MIFARE_MASK |
1006             NFC_PROTO_FELICA_MASK |
1007             NFC_PROTO_ISO14443_MASK |
1008             NFC_PROTO_ISO14443_B_MASK |
1009             NFC_PROTO_ISO15693_MASK |
1010             NFC_PROTO_NFC_DEP_MASK;
1011
1012         set_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &quirks);
1013
1014         info->hdev =
1015             nfc_hci_allocate_device(&st21nfca_hci_ops, &init_data, quirks,
1016                                     protocols, llc_name,
1017                                     phy_headroom + ST21NFCA_CMDS_HEADROOM,
1018                                     phy_tailroom, phy_payload);
1019
1020         if (!info->hdev) {
1021                 pr_err("Cannot allocate nfc hdev.\n");
1022                 r = -ENOMEM;
1023                 goto err_alloc_hdev;
1024         }
1025
1026         info->se_status = se_status;
1027
1028         nfc_hci_set_clientdata(info->hdev, info);
1029
1030         r = nfc_hci_register_device(info->hdev);
1031         if (r)
1032                 goto err_regdev;
1033
1034         *hdev = info->hdev;
1035         st21nfca_dep_init(info->hdev);
1036         st21nfca_se_init(info->hdev);
1037
1038         return 0;
1039
1040 err_regdev:
1041         nfc_hci_free_device(info->hdev);
1042
1043 err_alloc_hdev:
1044         kfree(info);
1045
1046         return r;
1047 }
1048 EXPORT_SYMBOL(st21nfca_hci_probe);
1049
1050 void st21nfca_hci_remove(struct nfc_hci_dev *hdev)
1051 {
1052         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
1053
1054         st21nfca_dep_deinit(hdev);
1055         st21nfca_se_deinit(hdev);
1056         nfc_hci_unregister_device(hdev);
1057         nfc_hci_free_device(hdev);
1058         kfree(info);
1059 }
1060 EXPORT_SYMBOL(st21nfca_hci_remove);
1061
1062 MODULE_LICENSE("GPL");
1063 MODULE_DESCRIPTION(DRIVER_DESC);