drivers/nfc/st21nfca/core.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
  26 #define DRIVER_DESC "HCI NFC driver for ST21NFCA"
  27
  28 #define FULL_VERSION_LEN 3
  29
  30 /* Proprietary gates, events, commands and registers */
  31
  32 /* Commands that apply to all RF readers */
  33 #define ST21NFCA_RF_READER_CMD_PRESENCE_CHECK   0x30
  34
  35 #define ST21NFCA_RF_READER_ISO15693_GATE        0x12
  36 #define ST21NFCA_RF_READER_ISO15693_INVENTORY   0x01
  37
  38 /*
  39  * Reader gate for communication with contact-less cards using Type A
  40  * protocol ISO14443-3 but not compliant with ISO14443-4
  41  */
  42 #define ST21NFCA_RF_READER_14443_3_A_GATE       0x15
  43 #define ST21NFCA_RF_READER_14443_3_A_UID        0x02
  44 #define ST21NFCA_RF_READER_14443_3_A_ATQA       0x03
  45 #define ST21NFCA_RF_READER_14443_3_A_SAK        0x04
  46
  47 #define ST21NFCA_RF_READER_F_DATARATE           0x01
  48 #define ST21NFCA_RF_READER_F_DATARATE_106       0x01
  49 #define ST21NFCA_RF_READER_F_DATARATE_212       0x02
  50 #define ST21NFCA_RF_READER_F_DATARATE_424       0x04
  51 #define ST21NFCA_RF_READER_F_POL_REQ            0x02
  52 #define ST21NFCA_RF_READER_F_POL_REQ_DEFAULT    0xffff0000
  53 #define ST21NFCA_RF_READER_F_NFCID2             0x03
  54 #define ST21NFCA_RF_READER_F_NFCID1             0x04
  55
  56 #define ST21NFCA_RF_CARD_F_MODE                 0x01
  57 #define ST21NFCA_RF_CARD_F_NFCID2_LIST          0x04
  58 #define ST21NFCA_RF_CARD_F_NFCID1               0x05
  59 #define ST21NFCA_RF_CARD_F_SENS_RES             0x06
  60 #define ST21NFCA_RF_CARD_F_SEL_RES              0x07
  61 #define ST21NFCA_RF_CARD_F_DATARATE             0x08
  62 #define ST21NFCA_RF_CARD_F_DATARATE_212_424     0x01
  63
  64 #define ST21NFCA_DEVICE_MGNT_PIPE               0x02
  65
  66 #define ST21NFCA_DM_GETINFO                     0x13
  67 #define ST21NFCA_DM_GETINFO_PIPE_LIST           0x02
  68 #define ST21NFCA_DM_GETINFO_PIPE_INFO           0x01
  69 #define ST21NFCA_DM_PIPE_CREATED                0x02
  70 #define ST21NFCA_DM_PIPE_OPEN                   0x04
  71 #define ST21NFCA_DM_RF_ACTIVE                   0x80
  72 #define ST21NFCA_DM_DISCONNECT                  0x30
  73
  74 #define ST21NFCA_DM_IS_PIPE_OPEN(p) \
  75         ((p & 0x0f) == (ST21NFCA_DM_PIPE_CREATED | ST21NFCA_DM_PIPE_OPEN))
  76
  77 #define ST21NFCA_NFC_MODE                       0x03    /* NFC_MODE parameter*/
  78
  79 #define ST21NFCA_EVT_HOT_PLUG                   0x03
  80 #define ST21NFCA_EVT_HOT_PLUG_IS_INHIBITED(x) (x->data[0] & 0x80)
  81
  82 #define ST21NFCA_SE_TO_PIPES                    2000
  83
  84 static DECLARE_BITMAP(dev_mask, ST21NFCA_NUM_DEVICES);
  85
  86 static struct nfc_hci_gate st21nfca_gates[] = {
  87         {NFC_HCI_ADMIN_GATE, NFC_HCI_ADMIN_PIPE},
  88         {NFC_HCI_LINK_MGMT_GATE, NFC_HCI_LINK_MGMT_PIPE},
  89         {ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_DEVICE_MGNT_PIPE},
  90
  91         {NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE},
  92         {NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_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_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE},
  96         {ST21NFCA_RF_READER_14443_3_A_GATE, NFC_HCI_INVALID_PIPE},
  97         {ST21NFCA_RF_READER_ISO15693_GATE, NFC_HCI_INVALID_PIPE},
  98         {ST21NFCA_RF_CARD_F_GATE, NFC_HCI_INVALID_PIPE},
  99
 100         /* Secure element pipes are created by secure element host */
 101         {ST21NFCA_CONNECTIVITY_GATE, NFC_HCI_DO_NOT_CREATE_PIPE},
 102         {ST21NFCA_APDU_READER_GATE, NFC_HCI_DO_NOT_CREATE_PIPE},
 103 };
 104
 105 struct st21nfca_pipe_info {
 106         u8 pipe_state;
 107         u8 src_host_id;
 108         u8 src_gate_id;
 109         u8 dst_host_id;
 110         u8 dst_gate_id;
 111 } __packed;
 112
 113 /* Largest headroom needed for outgoing custom commands */
 114 #define ST21NFCA_CMDS_HEADROOM  7
 115
 116 static int st21nfca_hci_load_session(struct nfc_hci_dev *hdev)
 117 {
 118         int i, j, r;
 119         struct sk_buff *skb_pipe_list, *skb_pipe_info;
 120         struct st21nfca_pipe_info *info;
 121
 122         u8 pipe_list[] = { ST21NFCA_DM_GETINFO_PIPE_LIST,
 123                 NFC_HCI_TERMINAL_HOST_ID
 124         };
 125         u8 pipe_info[] = { ST21NFCA_DM_GETINFO_PIPE_INFO,
 126                 NFC_HCI_TERMINAL_HOST_ID, 0
 127         };
 128
 129         /* On ST21NFCA device pipes number are dynamics
 130          * A maximum of 16 pipes can be created at the same time
 131          * If pipes are already created, hci_dev_up will fail.
 132          * Doing a clear all pipe is a bad idea because:
 133          * - It does useless EEPROM cycling
 134          * - It might cause issue for secure elements support
 135          * (such as removing connectivity or APDU reader pipe)
 136          * A better approach on ST21NFCA is to:
 137          * - get a pipe list for each host.
 138          * (eg: NFC_HCI_HOST_CONTROLLER_ID for now).
 139          * (TODO Later on UICC HOST and eSE HOST)
 140          * - get pipe information
 141          * - match retrieved pipe list in st21nfca_gates
 142          * ST21NFCA_DEVICE_MGNT_GATE is a proprietary gate
 143          * with ST21NFCA_DEVICE_MGNT_PIPE.
 144          * Pipe can be closed and need to be open.
 145          */
 146         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 147                                 ST21NFCA_DEVICE_MGNT_GATE,
 148                                 ST21NFCA_DEVICE_MGNT_PIPE);
 149         if (r < 0)
 150                 return r;
 151
 152         /* Get pipe list */
 153         r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 154                         ST21NFCA_DM_GETINFO, pipe_list, sizeof(pipe_list),
 155                         &skb_pipe_list);
 156         if (r < 0)
 157                 return r;
 158
 159         /* Complete the existing gate_pipe table */
 160         for (i = 0; i < skb_pipe_list->len; i++) {
 161                 pipe_info[2] = skb_pipe_list->data[i];
 162                 r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 163                                         ST21NFCA_DM_GETINFO, pipe_info,
 164                                         sizeof(pipe_info), &skb_pipe_info);
 165                 if (r)
 166                         continue;
 167
 168                 /*
 169                  * Match pipe ID and gate ID
 170                  * Output format from ST21NFC_DM_GETINFO is:
 171                  * - pipe state (1byte)
 172                  * - source hid (1byte)
 173                  * - source gid (1byte)
 174                  * - destination hid (1byte)
 175                  * - destination gid (1byte)
 176                  */
 177                 info = (struct st21nfca_pipe_info *) skb_pipe_info->data;
 178                 if (info->dst_gate_id == ST21NFCA_APDU_READER_GATE &&
 179                         info->src_host_id == NFC_HCI_UICC_HOST_ID) {
 180                         pr_err("Unexpected apdu_reader pipe on host %x\n",
 181                                 info->src_host_id);
 182                         kfree_skb(skb_pipe_info);
 183                         continue;
 184                 }
 185
 186                 for (j = 3; (j < ARRAY_SIZE(st21nfca_gates)) &&
 187                         (st21nfca_gates[j].gate != info->dst_gate_id) ; j++)
 188                         ;
 189
 190                 if (j < ARRAY_SIZE(st21nfca_gates) &&
 191                         st21nfca_gates[j].gate == info->dst_gate_id &&
 192                         ST21NFCA_DM_IS_PIPE_OPEN(info->pipe_state)) {
 193                         hdev->init_data.gates[j].pipe = pipe_info[2];
 194
 195                         hdev->gate2pipe[st21nfca_gates[j].gate] =
 196                                                 pipe_info[2];
 197                         hdev->pipes[pipe_info[2]].gate =
 198                                                 st21nfca_gates[j].gate;
 199                         hdev->pipes[pipe_info[2]].dest_host =
 200                                                 info->src_host_id;
 201                 }
 202                 kfree_skb(skb_pipe_info);
 203         }
 204
 205         /*
 206          * 3 gates have a well known pipe ID. Only NFC_HCI_LINK_MGMT_GATE
 207          * is not yet open at this stage.
 208          */
 209         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
 210                                  NFC_HCI_LINK_MGMT_GATE,
 211                                  NFC_HCI_LINK_MGMT_PIPE);
 212
 213         kfree_skb(skb_pipe_list);
 214         return r;
 215 }
 216
 217 static int st21nfca_hci_open(struct nfc_hci_dev *hdev)
 218 {
 219         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 220         int r;
 221
 222         mutex_lock(&info->info_lock);
 223
 224         if (info->state != ST21NFCA_ST_COLD) {
 225                 r = -EBUSY;
 226                 goto out;
 227         }
 228
 229         r = info->phy_ops->enable(info->phy_id);
 230
 231         if (r == 0)
 232                 info->state = ST21NFCA_ST_READY;
 233
 234 out:
 235         mutex_unlock(&info->info_lock);
 236         return r;
 237 }
 238
 239 static void st21nfca_hci_close(struct nfc_hci_dev *hdev)
 240 {
 241         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 242
 243         mutex_lock(&info->info_lock);
 244
 245         if (info->state == ST21NFCA_ST_COLD)
 246                 goto out;
 247
 248         info->phy_ops->disable(info->phy_id);
 249         info->state = ST21NFCA_ST_COLD;
 250
 251 out:
 252         mutex_unlock(&info->info_lock);
 253 }
 254
 255 static int st21nfca_hci_ready(struct nfc_hci_dev *hdev)
 256 {
 257         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 258         struct sk_buff *skb;
 259
 260         u8 param;
 261         u8 white_list[2];
 262         int wl_size = 0;
 263         int r;
 264
 265         if (info->se_status->is_uicc_present)
 266                 white_list[wl_size++] = NFC_HCI_UICC_HOST_ID;
 267         if (info->se_status->is_ese_present)
 268                 white_list[wl_size++] = ST21NFCA_ESE_HOST_ID;
 269
 270         if (wl_size) {
 271                 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 272                                         NFC_HCI_ADMIN_WHITELIST,
 273                                         (u8 *) &white_list, wl_size);
 274                 if (r < 0)
 275                         return r;
 276         }
 277
 278         /* Set NFC_MODE in device management gate to enable */
 279         r = nfc_hci_get_param(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 280                               ST21NFCA_NFC_MODE, &skb);
 281         if (r < 0)
 282                 return r;
 283
 284         param = skb->data[0];
 285         kfree_skb(skb);
 286         if (param == 0) {
 287                 param = 1;
 288
 289                 r = nfc_hci_set_param(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 290                                         ST21NFCA_NFC_MODE, &param, 1);
 291                 if (r < 0)
 292                         return r;
 293         }
 294
 295         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 296                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 297         if (r < 0)
 298                 return r;
 299
 300         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 301                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
 302         if (r < 0)
 303                 return r;
 304
 305         if (skb->len != FULL_VERSION_LEN) {
 306                 kfree_skb(skb);
 307                 return -EINVAL;
 308         }
 309
 310         print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
 311                        DUMP_PREFIX_NONE, 16, 1,
 312                        skb->data, FULL_VERSION_LEN, false);
 313
 314         kfree_skb(skb);
 315
 316         return 0;
 317 }
 318
 319 static int st21nfca_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 320 {
 321         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 322
 323         return info->phy_ops->write(info->phy_id, skb);
 324 }
 325
 326 static int st21nfca_hci_start_poll(struct nfc_hci_dev *hdev,
 327                                    u32 im_protocols, u32 tm_protocols)
 328 {
 329         int r;
 330         u32 pol_req;
 331         u8 param[19];
 332         struct sk_buff *datarate_skb;
 333
 334         pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n",
 335                 __func__, im_protocols, tm_protocols);
 336
 337         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 338                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 339         if (r < 0)
 340                 return r;
 341         if (im_protocols) {
 342                 /*
 343                  * enable polling according to im_protocols & tm_protocols
 344                  * - CLOSE pipe according to im_protocols & tm_protocols
 345                  */
 346                 if ((NFC_HCI_RF_READER_B_GATE & im_protocols) == 0) {
 347                         r = nfc_hci_disconnect_gate(hdev,
 348                                         NFC_HCI_RF_READER_B_GATE);
 349                         if (r < 0)
 350                                 return r;
 351                 }
 352
 353                 if ((NFC_HCI_RF_READER_A_GATE & im_protocols) == 0) {
 354                         r = nfc_hci_disconnect_gate(hdev,
 355                                         NFC_HCI_RF_READER_A_GATE);
 356                         if (r < 0)
 357                                 return r;
 358                 }
 359
 360                 if ((ST21NFCA_RF_READER_F_GATE & im_protocols) == 0) {
 361                         r = nfc_hci_disconnect_gate(hdev,
 362                                         ST21NFCA_RF_READER_F_GATE);
 363                         if (r < 0)
 364                                 return r;
 365                 } else {
 366                         hdev->gb = nfc_get_local_general_bytes(hdev->ndev,
 367                                                                &hdev->gb_len);
 368
 369                         if (hdev->gb == NULL || hdev->gb_len == 0) {
 370                                 im_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
 371                                 tm_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
 372                         }
 373
 374                         param[0] = ST21NFCA_RF_READER_F_DATARATE_106 |
 375                             ST21NFCA_RF_READER_F_DATARATE_212 |
 376                             ST21NFCA_RF_READER_F_DATARATE_424;
 377                         r = nfc_hci_set_param(hdev, ST21NFCA_RF_READER_F_GATE,
 378                                               ST21NFCA_RF_READER_F_DATARATE,
 379                                               param, 1);
 380                         if (r < 0)
 381                                 return r;
 382
 383                         pol_req = be32_to_cpu((__force __be32)
 384                                         ST21NFCA_RF_READER_F_POL_REQ_DEFAULT);
 385                         r = nfc_hci_set_param(hdev, ST21NFCA_RF_READER_F_GATE,
 386                                               ST21NFCA_RF_READER_F_POL_REQ,
 387                                               (u8 *) &pol_req, 4);
 388                         if (r < 0)
 389                                 return r;
 390                 }
 391
 392                 if ((ST21NFCA_RF_READER_14443_3_A_GATE & im_protocols) == 0) {
 393                         r = nfc_hci_disconnect_gate(hdev,
 394                                         ST21NFCA_RF_READER_14443_3_A_GATE);
 395                         if (r < 0)
 396                                 return r;
 397                 }
 398
 399                 if ((ST21NFCA_RF_READER_ISO15693_GATE & im_protocols) == 0) {
 400                         r = nfc_hci_disconnect_gate(hdev,
 401                                         ST21NFCA_RF_READER_ISO15693_GATE);
 402                         if (r < 0)
 403                                 return r;
 404                 }
 405
 406                 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 407                                        NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
 408                 if (r < 0)
 409                         nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 410                                            NFC_HCI_EVT_END_OPERATION, NULL, 0);
 411         }
 412
 413         if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
 414                 r = nfc_hci_get_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 415                                       ST21NFCA_RF_CARD_F_DATARATE,
 416                                       &datarate_skb);
 417                 if (r < 0)
 418                         return r;
 419
 420                 /* Configure the maximum supported datarate to 424Kbps */
 421                 if (datarate_skb->len > 0 &&
 422                     datarate_skb->data[0] !=
 423                     ST21NFCA_RF_CARD_F_DATARATE_212_424) {
 424                         param[0] = ST21NFCA_RF_CARD_F_DATARATE_212_424;
 425                         r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 426                                               ST21NFCA_RF_CARD_F_DATARATE,
 427                                               param, 1);
 428                         if (r < 0) {
 429                                 kfree_skb(datarate_skb);
 430                                 return r;
 431                         }
 432                 }
 433                 kfree_skb(datarate_skb);
 434
 435                 /*
 436                  * Configure sens_res
 437                  *
 438                  * NFC Forum Digital Spec Table 7:
 439                  * NFCID1 size: triple (10 bytes)
 440                  */
 441                 param[0] = 0x00;
 442                 param[1] = 0x08;
 443                 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 444                                       ST21NFCA_RF_CARD_F_SENS_RES, param, 2);
 445                 if (r < 0)
 446                         return r;
 447
 448                 /*
 449                  * Configure sel_res
 450                  *
 451                  * NFC Forum Digistal Spec Table 17:
 452                  * b3 set to 0b (value b7-b6):
 453                  * - 10b: Configured for NFC-DEP Protocol
 454                  */
 455                 param[0] = 0x40;
 456                 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 457                                       ST21NFCA_RF_CARD_F_SEL_RES, param, 1);
 458                 if (r < 0)
 459                         return r;
 460
 461                 /* Configure NFCID1 Random uid */
 462                 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 463                                       ST21NFCA_RF_CARD_F_NFCID1, NULL, 0);
 464                 if (r < 0)
 465                         return r;
 466
 467                 /* Configure NFCID2_LIST */
 468                 /* System Code */
 469                 param[0] = 0x00;
 470                 param[1] = 0x00;
 471                 /* NFCID2 */
 472                 param[2] = 0x01;
 473                 param[3] = 0xfe;
 474                 param[4] = 'S';
 475                 param[5] = 'T';
 476                 param[6] = 'M';
 477                 param[7] = 'i';
 478                 param[8] = 'c';
 479                 param[9] = 'r';
 480                 /* 8 byte Pad bytes used for polling respone frame */
 481
 482                 /*
 483                  * Configuration byte:
 484                  * - bit 0: define the default NFCID2 entry used when the
 485                  * system code is equal to 'FFFF'
 486                  * - bit 1: use a random value for lowest 6 bytes of
 487                  * NFCID2 value
 488                  * - bit 2: ignore polling request frame if request code
 489                  * is equal to '01'
 490                  * - Other bits are RFU
 491                  */
 492                 param[18] = 0x01;
 493                 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 494                                       ST21NFCA_RF_CARD_F_NFCID2_LIST, param,
 495                                       19);
 496                 if (r < 0)
 497                         return r;
 498
 499                 param[0] = 0x02;
 500                 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
 501                                       ST21NFCA_RF_CARD_F_MODE, param, 1);
 502         }
 503
 504         return r;
 505 }
 506
 507 static void st21nfca_hci_stop_poll(struct nfc_hci_dev *hdev)
 508 {
 509         nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 510                         ST21NFCA_DM_DISCONNECT, NULL, 0, NULL);
 511 }
 512
 513 static int st21nfca_get_iso14443_3_atqa(struct nfc_hci_dev *hdev, u16 *atqa)
 514 {
 515         int r;
 516         struct sk_buff *atqa_skb = NULL;
 517
 518         r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
 519                               ST21NFCA_RF_READER_14443_3_A_ATQA, &atqa_skb);
 520         if (r < 0)
 521                 goto exit;
 522
 523         if (atqa_skb->len != 2) {
 524                 r = -EPROTO;
 525                 goto exit;
 526         }
 527
 528         *atqa = be16_to_cpu(*(__be16 *) atqa_skb->data);
 529
 530 exit:
 531         kfree_skb(atqa_skb);
 532         return r;
 533 }
 534
 535 static int st21nfca_get_iso14443_3_sak(struct nfc_hci_dev *hdev, u8 *sak)
 536 {
 537         int r;
 538         struct sk_buff *sak_skb = NULL;
 539
 540         r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
 541                               ST21NFCA_RF_READER_14443_3_A_SAK, &sak_skb);
 542         if (r < 0)
 543                 goto exit;
 544
 545         if (sak_skb->len != 1) {
 546                 r = -EPROTO;
 547                 goto exit;
 548         }
 549
 550         *sak = sak_skb->data[0];
 551
 552 exit:
 553         kfree_skb(sak_skb);
 554         return r;
 555 }
 556
 557 static int st21nfca_get_iso14443_3_uid(struct nfc_hci_dev *hdev, u8 *uid,
 558                                        int *len)
 559 {
 560         int r;
 561         struct sk_buff *uid_skb = NULL;
 562
 563         r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
 564                               ST21NFCA_RF_READER_14443_3_A_UID, &uid_skb);
 565         if (r < 0)
 566                 goto exit;
 567
 568         if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
 569                 r = -EPROTO;
 570                 goto exit;
 571         }
 572
 573         memcpy(uid, uid_skb->data, uid_skb->len);
 574         *len = uid_skb->len;
 575 exit:
 576         kfree_skb(uid_skb);
 577         return r;
 578 }
 579
 580 static int st21nfca_get_iso15693_inventory(struct nfc_hci_dev *hdev,
 581                                            struct nfc_target *target)
 582 {
 583         int r;
 584         struct sk_buff *inventory_skb = NULL;
 585
 586         r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_ISO15693_GATE,
 587                               ST21NFCA_RF_READER_ISO15693_INVENTORY,
 588                               &inventory_skb);
 589         if (r < 0)
 590                 goto exit;
 591
 592         skb_pull(inventory_skb, 2);
 593
 594         if (inventory_skb->len == 0 ||
 595             inventory_skb->len > NFC_ISO15693_UID_MAXSIZE) {
 596                 r = -EPROTO;
 597                 goto exit;
 598         }
 599
 600         memcpy(target->iso15693_uid, inventory_skb->data, inventory_skb->len);
 601         target->iso15693_dsfid  = inventory_skb->data[1];
 602         target->is_iso15693 = 1;
 603 exit:
 604         kfree_skb(inventory_skb);
 605         return r;
 606 }
 607
 608 static int st21nfca_hci_dep_link_up(struct nfc_hci_dev *hdev,
 609                                     struct nfc_target *target, u8 comm_mode,
 610                                     u8 *gb, size_t gb_len)
 611 {
 612         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 613
 614         info->dep_info.idx = target->idx;
 615         return st21nfca_im_send_atr_req(hdev, gb, gb_len);
 616 }
 617
 618 static int st21nfca_hci_dep_link_down(struct nfc_hci_dev *hdev)
 619 {
 620         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 621
 622         info->state = ST21NFCA_ST_READY;
 623
 624         return nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 625                                 ST21NFCA_DM_DISCONNECT, NULL, 0, NULL);
 626 }
 627
 628 static int st21nfca_hci_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
 629                                          struct nfc_target *target)
 630 {
 631         int r, len;
 632         u16 atqa;
 633         u8 sak;
 634         u8 uid[NFC_NFCID1_MAXSIZE];
 635
 636         switch (gate) {
 637         case ST21NFCA_RF_READER_F_GATE:
 638                 target->supported_protocols = NFC_PROTO_FELICA_MASK;
 639                 break;
 640         case ST21NFCA_RF_READER_14443_3_A_GATE:
 641                 /* ISO14443-3 type 1 or 2 tags */
 642                 r = st21nfca_get_iso14443_3_atqa(hdev, &atqa);
 643                 if (r < 0)
 644                         return r;
 645                 if (atqa == 0x000c) {
 646                         target->supported_protocols = NFC_PROTO_JEWEL_MASK;
 647                         target->sens_res = 0x0c00;
 648                 } else {
 649                         r = st21nfca_get_iso14443_3_sak(hdev, &sak);
 650                         if (r < 0)
 651                                 return r;
 652
 653                         r = st21nfca_get_iso14443_3_uid(hdev, uid, &len);
 654                         if (r < 0)
 655                                 return r;
 656
 657                         target->supported_protocols =
 658                             nfc_hci_sak_to_protocol(sak);
 659                         if (target->supported_protocols == 0xffffffff)
 660                                 return -EPROTO;
 661
 662                         target->sens_res = atqa;
 663                         target->sel_res = sak;
 664                         memcpy(target->nfcid1, uid, len);
 665                         target->nfcid1_len = len;
 666                 }
 667
 668                 break;
 669         case ST21NFCA_RF_READER_ISO15693_GATE:
 670                 target->supported_protocols = NFC_PROTO_ISO15693_MASK;
 671                 r = st21nfca_get_iso15693_inventory(hdev, target);
 672                 if (r < 0)
 673                         return r;
 674                 break;
 675         default:
 676                 return -EPROTO;
 677         }
 678
 679         return 0;
 680 }
 681
 682 static int st21nfca_hci_complete_target_discovered(struct nfc_hci_dev *hdev,
 683                                                 u8 gate,
 684                                                 struct nfc_target *target)
 685 {
 686         int r;
 687         struct sk_buff *nfcid_skb = NULL;
 688
 689         if (gate == ST21NFCA_RF_READER_F_GATE) {
 690                 r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_F_GATE,
 691                                 ST21NFCA_RF_READER_F_NFCID2, &nfcid_skb);
 692                 if (r < 0)
 693                         goto exit;
 694
 695                 if (nfcid_skb->len > NFC_SENSF_RES_MAXSIZE) {
 696                         r = -EPROTO;
 697                         goto exit;
 698                 }
 699
 700                 /*
 701                  * - After the recepton of polling response for type F frame
 702                  * at 212 or 424 Kbit/s, NFCID2 registry parameters will be
 703                  * updated.
 704                  * - After the reception of SEL_RES with NFCIP-1 compliant bit
 705                  * set for type A frame NFCID1 will be updated
 706                  */
 707                 if (nfcid_skb->len > 0) {
 708                         /* P2P in type F */
 709                         memcpy(target->sensf_res, nfcid_skb->data,
 710                                 nfcid_skb->len);
 711                         target->sensf_res_len = nfcid_skb->len;
 712                         /* NFC Forum Digital Protocol Table 44 */
 713                         if (target->sensf_res[0] == 0x01 &&
 714                             target->sensf_res[1] == 0xfe)
 715                                 target->supported_protocols =
 716                                                         NFC_PROTO_NFC_DEP_MASK;
 717                         else
 718                                 target->supported_protocols =
 719                                                         NFC_PROTO_FELICA_MASK;
 720                 } else {
 721                         kfree_skb(nfcid_skb);
 722                         /* P2P in type A */
 723                         r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_F_GATE,
 724                                         ST21NFCA_RF_READER_F_NFCID1,
 725                                         &nfcid_skb);
 726                         if (r < 0)
 727                                 goto exit;
 728
 729                         if (nfcid_skb->len > NFC_NFCID1_MAXSIZE) {
 730                                 r = -EPROTO;
 731                                 goto exit;
 732                         }
 733                         memcpy(target->sensf_res, nfcid_skb->data,
 734                                 nfcid_skb->len);
 735                         target->sensf_res_len = nfcid_skb->len;
 736                         target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 737                 }
 738                 target->hci_reader_gate = ST21NFCA_RF_READER_F_GATE;
 739         }
 740         r = 1;
 741 exit:
 742         kfree_skb(nfcid_skb);
 743         return r;
 744 }
 745
 746 #define ST21NFCA_CB_TYPE_READER_ISO15693 1
 747 static void st21nfca_hci_data_exchange_cb(void *context, struct sk_buff *skb,
 748                                           int err)
 749 {
 750         struct st21nfca_hci_info *info = context;
 751
 752         switch (info->async_cb_type) {
 753         case ST21NFCA_CB_TYPE_READER_ISO15693:
 754                 if (err == 0)
 755                         skb_trim(skb, skb->len - 1);
 756                 info->async_cb(info->async_cb_context, skb, err);
 757                 break;
 758         default:
 759                 if (err == 0)
 760                         kfree_skb(skb);
 761                 break;
 762         }
 763 }
 764
 765 /*
 766  * Returns:
 767  * <= 0: driver handled the data exchange
 768  *    1: driver doesn't especially handle, please do standard processing
 769  */
 770 static int st21nfca_hci_im_transceive(struct nfc_hci_dev *hdev,
 771                                       struct nfc_target *target,
 772                                       struct sk_buff *skb,
 773                                       data_exchange_cb_t cb, void *cb_context)
 774 {
 775         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 776
 777         pr_info(DRIVER_DESC ": %s for gate=%d len=%d\n", __func__,
 778                 target->hci_reader_gate, skb->len);
 779
 780         switch (target->hci_reader_gate) {
 781         case ST21NFCA_RF_READER_F_GATE:
 782                 if (target->supported_protocols == NFC_PROTO_NFC_DEP_MASK)
 783                         return st21nfca_im_send_dep_req(hdev, skb);
 784
 785                 *skb_push(skb, 1) = 0x1a;
 786                 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 787                                               ST21NFCA_WR_XCHG_DATA, skb->data,
 788                                               skb->len, cb, cb_context);
 789         case ST21NFCA_RF_READER_14443_3_A_GATE:
 790                 *skb_push(skb, 1) = 0x1a;       /* CTR, see spec:10.2.2.1 */
 791
 792                 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 793                                               ST21NFCA_WR_XCHG_DATA, skb->data,
 794                                               skb->len, cb, cb_context);
 795         case ST21NFCA_RF_READER_ISO15693_GATE:
 796                 info->async_cb_type = ST21NFCA_CB_TYPE_READER_ISO15693;
 797                 info->async_cb = cb;
 798                 info->async_cb_context = cb_context;
 799
 800                 *skb_push(skb, 1) = 0x17;
 801
 802                 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 803                                               ST21NFCA_WR_XCHG_DATA, skb->data,
 804                                               skb->len,
 805                                               st21nfca_hci_data_exchange_cb,
 806                                               info);
 807                 break;
 808         default:
 809                 return 1;
 810         }
 811 }
 812
 813 static int st21nfca_hci_tm_send(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 814 {
 815         return st21nfca_tm_send_dep_res(hdev, skb);
 816 }
 817
 818 static int st21nfca_hci_check_presence(struct nfc_hci_dev *hdev,
 819                                        struct nfc_target *target)
 820 {
 821         u8 fwi = 0x11;
 822
 823         switch (target->hci_reader_gate) {
 824         case NFC_HCI_RF_READER_A_GATE:
 825         case NFC_HCI_RF_READER_B_GATE:
 826                 /*
 827                  * PRESENCE_CHECK on those gates is available
 828                  * However, the answer to this command is taking 3 * fwi
 829                  * if the card is no present.
 830                  * Instead, we send an empty I-Frame with a very short
 831                  * configurable fwi ~604µs.
 832                  */
 833                 return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
 834                                         ST21NFCA_WR_XCHG_DATA, &fwi, 1, NULL);
 835         case ST21NFCA_RF_READER_14443_3_A_GATE:
 836                 return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
 837                                         ST21NFCA_RF_READER_CMD_PRESENCE_CHECK,
 838                                         NULL, 0, NULL);
 839         default:
 840                 return -EOPNOTSUPP;
 841         }
 842 }
 843
 844 static void st21nfca_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
 845                                 struct sk_buff *skb)
 846 {
 847         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 848         u8 gate = hdev->pipes[pipe].gate;
 849
 850         pr_debug("cmd: %x\n", cmd);
 851
 852         switch (cmd) {
 853         case NFC_HCI_ANY_OPEN_PIPE:
 854                 if (gate != ST21NFCA_APDU_READER_GATE &&
 855                         hdev->pipes[pipe].dest_host != NFC_HCI_UICC_HOST_ID)
 856                         info->se_info.count_pipes++;
 857
 858                 if (info->se_info.count_pipes == info->se_info.expected_pipes) {
 859                         del_timer_sync(&info->se_info.se_active_timer);
 860                         info->se_info.se_active = false;
 861                         info->se_info.count_pipes = 0;
 862                         complete(&info->se_info.req_completion);
 863                 }
 864         break;
 865         }
 866 }
 867
 868 static int st21nfca_admin_event_received(struct nfc_hci_dev *hdev, u8 event,
 869                                         struct sk_buff *skb)
 870 {
 871         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 872
 873         pr_debug("admin event: %x\n", event);
 874
 875         switch (event) {
 876         case ST21NFCA_EVT_HOT_PLUG:
 877                 if (info->se_info.se_active) {
 878                         if (!ST21NFCA_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
 879                                 del_timer_sync(&info->se_info.se_active_timer);
 880                                 info->se_info.se_active = false;
 881                                 complete(&info->se_info.req_completion);
 882                         } else {
 883                                 mod_timer(&info->se_info.se_active_timer,
 884                                         jiffies +
 885                                         msecs_to_jiffies(ST21NFCA_SE_TO_PIPES));
 886                         }
 887                 }
 888         break;
 889         default:
 890                 nfc_err(&hdev->ndev->dev, "Unexpected event on admin gate\n");
 891         }
 892         kfree_skb(skb);
 893         return 0;
 894 }
 895
 896 /*
 897  * Returns:
 898  * <= 0: driver handled the event, skb consumed
 899  *    1: driver does not handle the event, please do standard processing
 900  */
 901 static int st21nfca_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe,
 902                                        u8 event, struct sk_buff *skb)
 903 {
 904         u8 gate = hdev->pipes[pipe].gate;
 905         u8 host = hdev->pipes[pipe].dest_host;
 906
 907         pr_debug("hci event: %d gate: %x\n", event, gate);
 908
 909         switch (gate) {
 910         case NFC_HCI_ADMIN_GATE:
 911                 return st21nfca_admin_event_received(hdev, event, skb);
 912         case ST21NFCA_RF_CARD_F_GATE:
 913                 return st21nfca_dep_event_received(hdev, event, skb);
 914         case ST21NFCA_CONNECTIVITY_GATE:
 915                 return st21nfca_connectivity_event_received(hdev, host,
 916                                                         event, skb);
 917         case ST21NFCA_APDU_READER_GATE:
 918                 return st21nfca_apdu_reader_event_received(hdev, event, skb);
 919         case NFC_HCI_LOOPBACK_GATE:
 920                 return st21nfca_hci_loopback_event_received(hdev, event, skb);
 921         default:
 922                 return 1;
 923         }
 924 }
 925
 926 static struct nfc_hci_ops st21nfca_hci_ops = {
 927         .open = st21nfca_hci_open,
 928         .close = st21nfca_hci_close,
 929         .load_session = st21nfca_hci_load_session,
 930         .hci_ready = st21nfca_hci_ready,
 931         .xmit = st21nfca_hci_xmit,
 932         .start_poll = st21nfca_hci_start_poll,
 933         .stop_poll = st21nfca_hci_stop_poll,
 934         .dep_link_up = st21nfca_hci_dep_link_up,
 935         .dep_link_down = st21nfca_hci_dep_link_down,
 936         .target_from_gate = st21nfca_hci_target_from_gate,
 937         .complete_target_discovered = st21nfca_hci_complete_target_discovered,
 938         .im_transceive = st21nfca_hci_im_transceive,
 939         .tm_send = st21nfca_hci_tm_send,
 940         .check_presence = st21nfca_hci_check_presence,
 941         .event_received = st21nfca_hci_event_received,
 942         .cmd_received = st21nfca_hci_cmd_received,
 943         .discover_se = st21nfca_hci_discover_se,
 944         .enable_se = st21nfca_hci_enable_se,
 945         .disable_se = st21nfca_hci_disable_se,
 946         .se_io = st21nfca_hci_se_io,
 947 };
 948
 949 int st21nfca_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops,
 950                        char *llc_name, int phy_headroom, int phy_tailroom,
 951                        int phy_payload, struct nfc_hci_dev **hdev,
 952                            struct st21nfca_se_status *se_status)
 953 {
 954         struct st21nfca_hci_info *info;
 955         int r = 0;
 956         int dev_num;
 957         u32 protocols;
 958         struct nfc_hci_init_data init_data;
 959         unsigned long quirks = 0;
 960
 961         info = kzalloc(sizeof(struct st21nfca_hci_info), GFP_KERNEL);
 962         if (!info) {
 963                 r = -ENOMEM;
 964                 goto err_alloc_hdev;
 965         }
 966
 967         info->phy_ops = phy_ops;
 968         info->phy_id = phy_id;
 969         info->state = ST21NFCA_ST_COLD;
 970         mutex_init(&info->info_lock);
 971
 972         init_data.gate_count = ARRAY_SIZE(st21nfca_gates);
 973
 974         memcpy(init_data.gates, st21nfca_gates, sizeof(st21nfca_gates));
 975
 976         /*
 977          * Session id must include the driver name + i2c bus addr
 978          * persistent info to discriminate 2 identical chips
 979          */
 980         dev_num = find_first_zero_bit(dev_mask, ST21NFCA_NUM_DEVICES);
 981         if (dev_num >= ST21NFCA_NUM_DEVICES)
 982                 return -ENODEV;
 983
 984         set_bit(dev_num, dev_mask);
 985
 986         scnprintf(init_data.session_id, sizeof(init_data.session_id), "%s%2x",
 987                   "ST21AH", dev_num);
 988
 989         protocols = NFC_PROTO_JEWEL_MASK |
 990             NFC_PROTO_MIFARE_MASK |
 991             NFC_PROTO_FELICA_MASK |
 992             NFC_PROTO_ISO14443_MASK |
 993             NFC_PROTO_ISO14443_B_MASK |
 994             NFC_PROTO_ISO15693_MASK |
 995             NFC_PROTO_NFC_DEP_MASK;
 996
 997         set_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &quirks);
 998
 999         info->hdev =
1000             nfc_hci_allocate_device(&st21nfca_hci_ops, &init_data, quirks,
1001                                     protocols, llc_name,
1002                                     phy_headroom + ST21NFCA_CMDS_HEADROOM,
1003                                     phy_tailroom, phy_payload);
1004
1005         if (!info->hdev) {
1006                 pr_err("Cannot allocate nfc hdev.\n");
1007                 r = -ENOMEM;
1008                 goto err_alloc_hdev;
1009         }
1010
1011         info->se_status = se_status;
1012
1013         nfc_hci_set_clientdata(info->hdev, info);
1014
1015         r = nfc_hci_register_device(info->hdev);
1016         if (r)
1017                 goto err_regdev;
1018
1019         *hdev = info->hdev;
1020         st21nfca_dep_init(info->hdev);
1021         st21nfca_se_init(info->hdev);
1022         st21nfca_vendor_cmds_init(info->hdev);
1023
1024         return 0;
1025
1026 err_regdev:
1027         nfc_hci_free_device(info->hdev);
1028
1029 err_alloc_hdev:
1030         kfree(info);
1031
1032         return r;
1033 }
1034 EXPORT_SYMBOL(st21nfca_hci_probe);
1035
1036 void st21nfca_hci_remove(struct nfc_hci_dev *hdev)
1037 {
1038         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
1039
1040         st21nfca_dep_deinit(hdev);
1041         st21nfca_se_deinit(hdev);
1042         nfc_hci_unregister_device(hdev);
1043         nfc_hci_free_device(hdev);
1044         kfree(info);
1045 }
1046 EXPORT_SYMBOL(st21nfca_hci_remove);
1047
1048 MODULE_LICENSE("GPL");
1049 MODULE_DESCRIPTION(DRIVER_DESC);