drivers/nfc/pn544/pn544.c

   1 /*
   2  * HCI based Driver for NXP PN544 NFC Chip
   3  *
   4  * Copyright (C) 2012  Intel Corporation. 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, write to the
  17  * Free Software Foundation, Inc.,
  18  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <linux/delay.h>
  22 #include <linux/slab.h>
  23 #include <linux/module.h>
  24
  25 #include <linux/nfc.h>
  26 #include <net/nfc/hci.h>
  27 #include <net/nfc/llc.h>
  28
  29 #include "pn544.h"
  30
  31 /* Timing restrictions (ms) */
  32 #define PN544_HCI_RESETVEN_TIME         30
  33
  34 enum pn544_state {
  35         PN544_ST_COLD,
  36         PN544_ST_FW_READY,
  37         PN544_ST_READY,
  38 };
  39
  40 #define FULL_VERSION_LEN 11
  41
  42 /* Proprietary commands */
  43 #define PN544_WRITE             0x3f
  44
  45 /* Proprietary gates, events, commands and registers */
  46
  47 /* NFC_HCI_RF_READER_A_GATE additional registers and commands */
  48 #define PN544_RF_READER_A_AUTO_ACTIVATION                       0x10
  49 #define PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION               0x12
  50 #define PN544_MIFARE_CMD                                        0x21
  51
  52 /* Commands that apply to all RF readers */
  53 #define PN544_RF_READER_CMD_PRESENCE_CHECK      0x30
  54 #define PN544_RF_READER_CMD_ACTIVATE_NEXT       0x32
  55
  56 /* NFC_HCI_ID_MGMT_GATE additional registers */
  57 #define PN544_ID_MGMT_FULL_VERSION_SW           0x10
  58
  59 #define PN544_RF_READER_ISO15693_GATE           0x12
  60
  61 #define PN544_RF_READER_F_GATE                  0x14
  62 #define PN544_FELICA_ID                         0x04
  63 #define PN544_FELICA_RAW                        0x20
  64
  65 #define PN544_RF_READER_JEWEL_GATE              0x15
  66 #define PN544_JEWEL_RAW_CMD                     0x23
  67
  68 #define PN544_RF_READER_NFCIP1_INITIATOR_GATE   0x30
  69 #define PN544_RF_READER_NFCIP1_TARGET_GATE      0x31
  70
  71 #define PN544_SYS_MGMT_GATE                     0x90
  72 #define PN544_SYS_MGMT_INFO_NOTIFICATION        0x02
  73
  74 #define PN544_POLLING_LOOP_MGMT_GATE            0x94
  75 #define PN544_DEP_MODE                          0x01
  76 #define PN544_DEP_ATR_REQ                       0x02
  77 #define PN544_DEP_ATR_RES                       0x03
  78 #define PN544_DEP_MERGE                         0x0D
  79 #define PN544_PL_RDPHASES                       0x06
  80 #define PN544_PL_EMULATION                      0x07
  81 #define PN544_PL_NFCT_DEACTIVATED               0x09
  82
  83 #define PN544_SWP_MGMT_GATE                     0xA0
  84
  85 #define PN544_NFC_WI_MGMT_GATE                  0xA1
  86
  87 #define PN544_HCI_EVT_SND_DATA                  0x01
  88 #define PN544_HCI_EVT_ACTIVATED                 0x02
  89 #define PN544_HCI_EVT_DEACTIVATED               0x03
  90 #define PN544_HCI_EVT_RCV_DATA                  0x04
  91 #define PN544_HCI_EVT_CONTINUE_MI               0x05
  92
  93 #define PN544_HCI_CMD_ATTREQUEST                0x12
  94 #define PN544_HCI_CMD_CONTINUE_ACTIVATION       0x13
  95
  96 static struct nfc_hci_gate pn544_gates[] = {
  97         {NFC_HCI_ADMIN_GATE, NFC_HCI_INVALID_PIPE},
  98         {NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE},
  99         {NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_PIPE},
 100         {NFC_HCI_LINK_MGMT_GATE, NFC_HCI_INVALID_PIPE},
 101         {NFC_HCI_RF_READER_B_GATE, NFC_HCI_INVALID_PIPE},
 102         {NFC_HCI_RF_READER_A_GATE, NFC_HCI_INVALID_PIPE},
 103         {PN544_SYS_MGMT_GATE, NFC_HCI_INVALID_PIPE},
 104         {PN544_SWP_MGMT_GATE, NFC_HCI_INVALID_PIPE},
 105         {PN544_POLLING_LOOP_MGMT_GATE, NFC_HCI_INVALID_PIPE},
 106         {PN544_NFC_WI_MGMT_GATE, NFC_HCI_INVALID_PIPE},
 107         {PN544_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE},
 108         {PN544_RF_READER_JEWEL_GATE, NFC_HCI_INVALID_PIPE},
 109         {PN544_RF_READER_ISO15693_GATE, NFC_HCI_INVALID_PIPE},
 110         {PN544_RF_READER_NFCIP1_INITIATOR_GATE, NFC_HCI_INVALID_PIPE},
 111         {PN544_RF_READER_NFCIP1_TARGET_GATE, NFC_HCI_INVALID_PIPE}
 112 };
 113
 114 /* Largest headroom needed for outgoing custom commands */
 115 #define PN544_CMDS_HEADROOM     2
 116
 117 struct pn544_hci_info {
 118         struct nfc_phy_ops *phy_ops;
 119         void *phy_id;
 120
 121         struct nfc_hci_dev *hdev;
 122
 123         enum pn544_state state;
 124
 125         struct mutex info_lock;
 126
 127         int async_cb_type;
 128         data_exchange_cb_t async_cb;
 129         void *async_cb_context;
 130
 131         fw_download_t fw_download;
 132 };
 133
 134 static int pn544_hci_open(struct nfc_hci_dev *hdev)
 135 {
 136         struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
 137         int r = 0;
 138
 139         mutex_lock(&info->info_lock);
 140
 141         if (info->state != PN544_ST_COLD) {
 142                 r = -EBUSY;
 143                 goto out;
 144         }
 145
 146         r = info->phy_ops->enable(info->phy_id);
 147
 148         if (r == 0)
 149                 info->state = PN544_ST_READY;
 150
 151 out:
 152         mutex_unlock(&info->info_lock);
 153         return r;
 154 }
 155
 156 static void pn544_hci_close(struct nfc_hci_dev *hdev)
 157 {
 158         struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
 159
 160         mutex_lock(&info->info_lock);
 161
 162         if (info->state == PN544_ST_COLD)
 163                 goto out;
 164
 165         info->phy_ops->disable(info->phy_id);
 166
 167         info->state = PN544_ST_COLD;
 168
 169 out:
 170         mutex_unlock(&info->info_lock);
 171 }
 172
 173 static int pn544_hci_ready(struct nfc_hci_dev *hdev)
 174 {
 175         struct sk_buff *skb;
 176         static struct hw_config {
 177                 u8 adr[2];
 178                 u8 value;
 179         } hw_config[] = {
 180                 {{0x9f, 0x9a}, 0x00},
 181
 182                 {{0x98, 0x10}, 0xbc},
 183
 184                 {{0x9e, 0x71}, 0x00},
 185
 186                 {{0x98, 0x09}, 0x00},
 187
 188                 {{0x9e, 0xb4}, 0x00},
 189
 190                 {{0x9e, 0xd9}, 0xff},
 191                 {{0x9e, 0xda}, 0xff},
 192                 {{0x9e, 0xdb}, 0x23},
 193                 {{0x9e, 0xdc}, 0x21},
 194                 {{0x9e, 0xdd}, 0x22},
 195                 {{0x9e, 0xde}, 0x24},
 196
 197                 {{0x9c, 0x01}, 0x08},
 198
 199                 {{0x9e, 0xaa}, 0x01},
 200
 201                 {{0x9b, 0xd1}, 0x0d},
 202                 {{0x9b, 0xd2}, 0x24},
 203                 {{0x9b, 0xd3}, 0x0a},
 204                 {{0x9b, 0xd4}, 0x22},
 205                 {{0x9b, 0xd5}, 0x08},
 206                 {{0x9b, 0xd6}, 0x1e},
 207                 {{0x9b, 0xdd}, 0x1c},
 208
 209                 {{0x9b, 0x84}, 0x13},
 210                 {{0x99, 0x81}, 0x7f},
 211                 {{0x99, 0x31}, 0x70},
 212
 213                 {{0x98, 0x00}, 0x3f},
 214
 215                 {{0x9f, 0x09}, 0x00},
 216
 217                 {{0x9f, 0x0a}, 0x05},
 218
 219                 {{0x9e, 0xd1}, 0xa1},
 220                 {{0x99, 0x23}, 0x00},
 221
 222                 {{0x9e, 0x74}, 0x80},
 223
 224                 {{0x9f, 0x28}, 0x10},
 225
 226                 {{0x9f, 0x35}, 0x14},
 227
 228                 {{0x9f, 0x36}, 0x60},
 229
 230                 {{0x9c, 0x31}, 0x00},
 231
 232                 {{0x9c, 0x32}, 0xc8},
 233
 234                 {{0x9c, 0x19}, 0x40},
 235
 236                 {{0x9c, 0x1a}, 0x40},
 237
 238                 {{0x9c, 0x0c}, 0x00},
 239
 240                 {{0x9c, 0x0d}, 0x00},
 241
 242                 {{0x9c, 0x12}, 0x00},
 243
 244                 {{0x9c, 0x13}, 0x00},
 245
 246                 {{0x98, 0xa2}, 0x0e},
 247
 248                 {{0x98, 0x93}, 0x40},
 249
 250                 {{0x98, 0x7d}, 0x02},
 251                 {{0x98, 0x7e}, 0x00},
 252                 {{0x9f, 0xc8}, 0x01},
 253         };
 254         struct hw_config *p = hw_config;
 255         int count = ARRAY_SIZE(hw_config);
 256         struct sk_buff *res_skb;
 257         u8 param[4];
 258         int r;
 259
 260         param[0] = 0;
 261         while (count--) {
 262                 param[1] = p->adr[0];
 263                 param[2] = p->adr[1];
 264                 param[3] = p->value;
 265
 266                 r = nfc_hci_send_cmd(hdev, PN544_SYS_MGMT_GATE, PN544_WRITE,
 267                                      param, 4, &res_skb);
 268                 if (r < 0)
 269                         return r;
 270
 271                 if (res_skb->len != 1) {
 272                         kfree_skb(res_skb);
 273                         return -EPROTO;
 274                 }
 275
 276                 if (res_skb->data[0] != p->value) {
 277                         kfree_skb(res_skb);
 278                         return -EIO;
 279                 }
 280
 281                 kfree_skb(res_skb);
 282
 283                 p++;
 284         }
 285
 286         param[0] = NFC_HCI_UICC_HOST_ID;
 287         r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 288                               NFC_HCI_ADMIN_WHITELIST, param, 1);
 289         if (r < 0)
 290                 return r;
 291
 292         param[0] = 0x3d;
 293         r = nfc_hci_set_param(hdev, PN544_SYS_MGMT_GATE,
 294                               PN544_SYS_MGMT_INFO_NOTIFICATION, param, 1);
 295         if (r < 0)
 296                 return r;
 297
 298         param[0] = 0x0;
 299         r = nfc_hci_set_param(hdev, NFC_HCI_RF_READER_A_GATE,
 300                               PN544_RF_READER_A_AUTO_ACTIVATION, param, 1);
 301         if (r < 0)
 302                 return r;
 303
 304         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 305                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 306         if (r < 0)
 307                 return r;
 308
 309         param[0] = 0x1;
 310         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 311                               PN544_PL_NFCT_DEACTIVATED, param, 1);
 312         if (r < 0)
 313                 return r;
 314
 315         param[0] = 0x0;
 316         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 317                               PN544_PL_RDPHASES, param, 1);
 318         if (r < 0)
 319                 return r;
 320
 321         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 322                               PN544_ID_MGMT_FULL_VERSION_SW, &skb);
 323         if (r < 0)
 324                 return r;
 325
 326         if (skb->len != FULL_VERSION_LEN) {
 327                 kfree_skb(skb);
 328                 return -EINVAL;
 329         }
 330
 331         print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
 332                        DUMP_PREFIX_NONE, 16, 1,
 333                        skb->data, FULL_VERSION_LEN, false);
 334
 335         kfree_skb(skb);
 336
 337         return 0;
 338 }
 339
 340 static int pn544_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 341 {
 342         struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
 343
 344         return info->phy_ops->write(info->phy_id, skb);
 345 }
 346
 347 static int pn544_hci_start_poll(struct nfc_hci_dev *hdev,
 348                                 u32 im_protocols, u32 tm_protocols)
 349 {
 350         u8 phases = 0;
 351         int r;
 352         u8 duration[2];
 353         u8 activated;
 354         u8 i_mode = 0x3f; /* Enable all supported modes */
 355         u8 t_mode = 0x0f;
 356         u8 t_merge = 0x01; /* Enable merge by default */
 357
 358         pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n",
 359                 __func__, im_protocols, tm_protocols);
 360
 361         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 362                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 363         if (r < 0)
 364                 return r;
 365
 366         duration[0] = 0x18;
 367         duration[1] = 0x6a;
 368         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 369                               PN544_PL_EMULATION, duration, 2);
 370         if (r < 0)
 371                 return r;
 372
 373         activated = 0;
 374         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 375                               PN544_PL_NFCT_DEACTIVATED, &activated, 1);
 376         if (r < 0)
 377                 return r;
 378
 379         if (im_protocols & (NFC_PROTO_ISO14443_MASK | NFC_PROTO_MIFARE_MASK |
 380                          NFC_PROTO_JEWEL_MASK))
 381                 phases |= 1;            /* Type A */
 382         if (im_protocols & NFC_PROTO_FELICA_MASK) {
 383                 phases |= (1 << 2);     /* Type F 212 */
 384                 phases |= (1 << 3);     /* Type F 424 */
 385         }
 386
 387         phases |= (1 << 5);             /* NFC active */
 388
 389         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 390                               PN544_PL_RDPHASES, &phases, 1);
 391         if (r < 0)
 392                 return r;
 393
 394         if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
 395                 hdev->gb = nfc_get_local_general_bytes(hdev->ndev,
 396                                                         &hdev->gb_len);
 397                 pr_debug("generate local bytes %p", hdev->gb);
 398                 if (hdev->gb == NULL || hdev->gb_len == 0) {
 399                         im_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
 400                         tm_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
 401                 }
 402         }
 403
 404         if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
 405                 r = nfc_hci_send_event(hdev,
 406                                 PN544_RF_READER_NFCIP1_INITIATOR_GATE,
 407                                 NFC_HCI_EVT_END_OPERATION, NULL, 0);
 408                 if (r < 0)
 409                         return r;
 410
 411                 r = nfc_hci_set_param(hdev,
 412                                 PN544_RF_READER_NFCIP1_INITIATOR_GATE,
 413                                 PN544_DEP_MODE, &i_mode, 1);
 414                 if (r < 0)
 415                         return r;
 416
 417                 r = nfc_hci_set_param(hdev,
 418                                 PN544_RF_READER_NFCIP1_INITIATOR_GATE,
 419                                 PN544_DEP_ATR_REQ, hdev->gb, hdev->gb_len);
 420                 if (r < 0)
 421                         return r;
 422
 423                 r = nfc_hci_send_event(hdev,
 424                                 PN544_RF_READER_NFCIP1_INITIATOR_GATE,
 425                                 NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
 426                 if (r < 0)
 427                         nfc_hci_send_event(hdev,
 428                                         PN544_RF_READER_NFCIP1_INITIATOR_GATE,
 429                                         NFC_HCI_EVT_END_OPERATION, NULL, 0);
 430         }
 431
 432         if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
 433                 r = nfc_hci_set_param(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
 434                                 PN544_DEP_MODE, &t_mode, 1);
 435                 if (r < 0)
 436                         return r;
 437
 438                 r = nfc_hci_set_param(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
 439                                 PN544_DEP_ATR_RES, hdev->gb, hdev->gb_len);
 440                 if (r < 0)
 441                         return r;
 442
 443                 r = nfc_hci_set_param(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
 444                                 PN544_DEP_MERGE, &t_merge, 1);
 445                 if (r < 0)
 446                         return r;
 447         }
 448
 449         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 450                                NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
 451         if (r < 0)
 452                 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 453                                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
 454
 455         return r;
 456 }
 457
 458 static int pn544_hci_dep_link_up(struct nfc_hci_dev *hdev,
 459                                 struct nfc_target *target, u8 comm_mode,
 460                                 u8 *gb, size_t gb_len)
 461 {
 462         struct sk_buff *rgb_skb = NULL;
 463         int r;
 464
 465         r = nfc_hci_get_param(hdev, target->hci_reader_gate,
 466                                 PN544_DEP_ATR_RES, &rgb_skb);
 467         if (r < 0)
 468                 return r;
 469
 470         if (rgb_skb->len == 0 || rgb_skb->len > NFC_GB_MAXSIZE) {
 471                 r = -EPROTO;
 472                 goto exit;
 473         }
 474         print_hex_dump(KERN_DEBUG, "remote gb: ", DUMP_PREFIX_OFFSET,
 475                         16, 1, rgb_skb->data, rgb_skb->len, true);
 476
 477         r = nfc_set_remote_general_bytes(hdev->ndev, rgb_skb->data,
 478                                                 rgb_skb->len);
 479
 480         if (r == 0)
 481                 r = nfc_dep_link_is_up(hdev->ndev, target->idx, comm_mode,
 482                                         NFC_RF_INITIATOR);
 483 exit:
 484         kfree_skb(rgb_skb);
 485         return r;
 486 }
 487
 488 static int pn544_hci_dep_link_down(struct nfc_hci_dev *hdev)
 489 {
 490
 491         return nfc_hci_send_event(hdev, PN544_RF_READER_NFCIP1_INITIATOR_GATE,
 492                                         NFC_HCI_EVT_END_OPERATION, NULL, 0);
 493 }
 494
 495 static int pn544_hci_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
 496                                       struct nfc_target *target)
 497 {
 498         switch (gate) {
 499         case PN544_RF_READER_F_GATE:
 500                 target->supported_protocols = NFC_PROTO_FELICA_MASK;
 501                 break;
 502         case PN544_RF_READER_JEWEL_GATE:
 503                 target->supported_protocols = NFC_PROTO_JEWEL_MASK;
 504                 target->sens_res = 0x0c00;
 505                 break;
 506         case PN544_RF_READER_NFCIP1_INITIATOR_GATE:
 507                 target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 508                 break;
 509         default:
 510                 return -EPROTO;
 511         }
 512
 513         return 0;
 514 }
 515
 516 static int pn544_hci_complete_target_discovered(struct nfc_hci_dev *hdev,
 517                                                 u8 gate,
 518                                                 struct nfc_target *target)
 519 {
 520         struct sk_buff *uid_skb;
 521         int r = 0;
 522
 523         if (gate == PN544_RF_READER_NFCIP1_INITIATOR_GATE)
 524                 return r;
 525
 526         if (target->supported_protocols & NFC_PROTO_NFC_DEP_MASK) {
 527                 r = nfc_hci_send_cmd(hdev,
 528                         PN544_RF_READER_NFCIP1_INITIATOR_GATE,
 529                         PN544_HCI_CMD_CONTINUE_ACTIVATION, NULL, 0, NULL);
 530                 if (r < 0)
 531                         return r;
 532
 533                 target->hci_reader_gate = PN544_RF_READER_NFCIP1_INITIATOR_GATE;
 534         } else if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
 535                 if (target->nfcid1_len != 4 && target->nfcid1_len != 7 &&
 536                     target->nfcid1_len != 10)
 537                         return -EPROTO;
 538
 539                 r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
 540                                      PN544_RF_READER_CMD_ACTIVATE_NEXT,
 541                                      target->nfcid1, target->nfcid1_len, NULL);
 542         } else if (target->supported_protocols & NFC_PROTO_FELICA_MASK) {
 543                 r = nfc_hci_get_param(hdev, PN544_RF_READER_F_GATE,
 544                                       PN544_FELICA_ID, &uid_skb);
 545                 if (r < 0)
 546                         return r;
 547
 548                 if (uid_skb->len != 8) {
 549                         kfree_skb(uid_skb);
 550                         return -EPROTO;
 551                 }
 552
 553                 /* Type F NFC-DEP IDm has prefix 0x01FE */
 554                 if ((uid_skb->data[0] == 0x01) && (uid_skb->data[1] == 0xfe)) {
 555                         kfree_skb(uid_skb);
 556                         r = nfc_hci_send_cmd(hdev,
 557                                         PN544_RF_READER_NFCIP1_INITIATOR_GATE,
 558                                         PN544_HCI_CMD_CONTINUE_ACTIVATION,
 559                                         NULL, 0, NULL);
 560                         if (r < 0)
 561                                 return r;
 562
 563                         target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 564                         target->hci_reader_gate =
 565                                 PN544_RF_READER_NFCIP1_INITIATOR_GATE;
 566                 } else {
 567                         r = nfc_hci_send_cmd(hdev, PN544_RF_READER_F_GATE,
 568                                              PN544_RF_READER_CMD_ACTIVATE_NEXT,
 569                                              uid_skb->data, uid_skb->len, NULL);
 570                         kfree_skb(uid_skb);
 571                 }
 572         } else if (target->supported_protocols & NFC_PROTO_ISO14443_MASK) {
 573                 /*
 574                  * TODO: maybe other ISO 14443 require some kind of continue
 575                  * activation, but for now we've seen only this one below.
 576                  */
 577                 if (target->sens_res == 0x4403) /* Type 4 Mifare DESFire */
 578                         r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
 579                               PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION,
 580                               NULL, 0, NULL);
 581         }
 582
 583         return r;
 584 }
 585
 586 #define PN544_CB_TYPE_READER_F 1
 587
 588 static void pn544_hci_data_exchange_cb(void *context, struct sk_buff *skb,
 589                                        int err)
 590 {
 591         struct pn544_hci_info *info = context;
 592
 593         switch (info->async_cb_type) {
 594         case PN544_CB_TYPE_READER_F:
 595                 if (err == 0)
 596                         skb_pull(skb, 1);
 597                 info->async_cb(info->async_cb_context, skb, err);
 598                 break;
 599         default:
 600                 if (err == 0)
 601                         kfree_skb(skb);
 602                 break;
 603         }
 604 }
 605
 606 #define MIFARE_CMD_AUTH_KEY_A   0x60
 607 #define MIFARE_CMD_AUTH_KEY_B   0x61
 608 #define MIFARE_CMD_HEADER       2
 609 #define MIFARE_UID_LEN          4
 610 #define MIFARE_KEY_LEN          6
 611 #define MIFARE_CMD_LEN          12
 612 /*
 613  * Returns:
 614  * <= 0: driver handled the data exchange
 615  *    1: driver doesn't especially handle, please do standard processing
 616  */
 617 static int pn544_hci_im_transceive(struct nfc_hci_dev *hdev,
 618                                    struct nfc_target *target,
 619                                    struct sk_buff *skb, data_exchange_cb_t cb,
 620                                    void *cb_context)
 621 {
 622         struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
 623
 624         pr_info(DRIVER_DESC ": %s for gate=%d\n", __func__,
 625                 target->hci_reader_gate);
 626
 627         switch (target->hci_reader_gate) {
 628         case NFC_HCI_RF_READER_A_GATE:
 629                 if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
 630                         /*
 631                          * It seems that pn544 is inverting key and UID for
 632                          * MIFARE authentication commands.
 633                          */
 634                         if (skb->len == MIFARE_CMD_LEN &&
 635                             (skb->data[0] == MIFARE_CMD_AUTH_KEY_A ||
 636                              skb->data[0] == MIFARE_CMD_AUTH_KEY_B)) {
 637                                 u8 uid[MIFARE_UID_LEN];
 638                                 u8 *data = skb->data + MIFARE_CMD_HEADER;
 639
 640                                 memcpy(uid, data + MIFARE_KEY_LEN,
 641                                        MIFARE_UID_LEN);
 642                                 memmove(data + MIFARE_UID_LEN, data,
 643                                         MIFARE_KEY_LEN);
 644                                 memcpy(data, uid, MIFARE_UID_LEN);
 645                         }
 646
 647                         return nfc_hci_send_cmd_async(hdev,
 648                                                       target->hci_reader_gate,
 649                                                       PN544_MIFARE_CMD,
 650                                                       skb->data, skb->len,
 651                                                       cb, cb_context);
 652                 } else
 653                         return 1;
 654         case PN544_RF_READER_F_GATE:
 655                 *skb_push(skb, 1) = 0;
 656                 *skb_push(skb, 1) = 0;
 657
 658                 info->async_cb_type = PN544_CB_TYPE_READER_F;
 659                 info->async_cb = cb;
 660                 info->async_cb_context = cb_context;
 661
 662                 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 663                                               PN544_FELICA_RAW, skb->data,
 664                                               skb->len,
 665                                               pn544_hci_data_exchange_cb, info);
 666         case PN544_RF_READER_JEWEL_GATE:
 667                 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 668                                               PN544_JEWEL_RAW_CMD, skb->data,
 669                                               skb->len, cb, cb_context);
 670         case PN544_RF_READER_NFCIP1_INITIATOR_GATE:
 671                 *skb_push(skb, 1) = 0;
 672
 673                 return nfc_hci_send_event(hdev, target->hci_reader_gate,
 674                                         PN544_HCI_EVT_SND_DATA, skb->data,
 675                                         skb->len);
 676         default:
 677                 return 1;
 678         }
 679 }
 680
 681 static int pn544_hci_tm_send(struct nfc_hci_dev *hdev, struct sk_buff *skb)
 682 {
 683         int r;
 684
 685         /* Set default false for multiple information chaining */
 686         *skb_push(skb, 1) = 0;
 687
 688         r = nfc_hci_send_event(hdev, PN544_RF_READER_NFCIP1_TARGET_GATE,
 689                                PN544_HCI_EVT_SND_DATA, skb->data, skb->len);
 690
 691         kfree_skb(skb);
 692
 693         return r;
 694 }
 695
 696 static int pn544_hci_check_presence(struct nfc_hci_dev *hdev,
 697                                    struct nfc_target *target)
 698 {
 699         pr_debug("supported protocol %d", target->supported_protocols);
 700         if (target->supported_protocols & (NFC_PROTO_ISO14443_MASK |
 701                                         NFC_PROTO_ISO14443_B_MASK)) {
 702                 return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
 703                                         PN544_RF_READER_CMD_PRESENCE_CHECK,
 704                                         NULL, 0, NULL);
 705         } else if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
 706                 if (target->nfcid1_len != 4 && target->nfcid1_len != 7 &&
 707                     target->nfcid1_len != 10)
 708                         return -EOPNOTSUPP;
 709
 710                  return nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
 711                                      PN544_RF_READER_CMD_ACTIVATE_NEXT,
 712                                      target->nfcid1, target->nfcid1_len, NULL);
 713         } else if (target->supported_protocols & (NFC_PROTO_JEWEL_MASK |
 714                                                 NFC_PROTO_FELICA_MASK)) {
 715                 return -EOPNOTSUPP;
 716         } else if (target->supported_protocols & NFC_PROTO_NFC_DEP_MASK) {
 717                 return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
 718                                         PN544_HCI_CMD_ATTREQUEST,
 719                                         NULL, 0, NULL);
 720         }
 721
 722         return 0;
 723 }
 724
 725 /*
 726  * Returns:
 727  * <= 0: driver handled the event, skb consumed
 728  *    1: driver does not handle the event, please do standard processing
 729  */
 730 static int pn544_hci_event_received(struct nfc_hci_dev *hdev, u8 gate, u8 event,
 731                                     struct sk_buff *skb)
 732 {
 733         struct sk_buff *rgb_skb = NULL;
 734         int r;
 735
 736         pr_debug("hci event %d", event);
 737         switch (event) {
 738         case PN544_HCI_EVT_ACTIVATED:
 739                 if (gate == PN544_RF_READER_NFCIP1_INITIATOR_GATE) {
 740                         r = nfc_hci_target_discovered(hdev, gate);
 741                 } else if (gate == PN544_RF_READER_NFCIP1_TARGET_GATE) {
 742                         r = nfc_hci_get_param(hdev, gate, PN544_DEP_ATR_REQ,
 743                                               &rgb_skb);
 744                         if (r < 0)
 745                                 goto exit;
 746
 747                         r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
 748                                              NFC_COMM_PASSIVE, rgb_skb->data,
 749                                              rgb_skb->len);
 750
 751                         kfree_skb(rgb_skb);
 752                 } else {
 753                         r = -EINVAL;
 754                 }
 755                 break;
 756         case PN544_HCI_EVT_DEACTIVATED:
 757                 r = nfc_hci_send_event(hdev, gate, NFC_HCI_EVT_END_OPERATION,
 758                                        NULL, 0);
 759                 break;
 760         case PN544_HCI_EVT_RCV_DATA:
 761                 if (skb->len < 2) {
 762                         r = -EPROTO;
 763                         goto exit;
 764                 }
 765
 766                 if (skb->data[0] != 0) {
 767                         pr_debug("data0 %d", skb->data[0]);
 768                         r = -EPROTO;
 769                         goto exit;
 770                 }
 771
 772                 skb_pull(skb, 2);
 773                 return nfc_tm_data_received(hdev->ndev, skb);
 774         default:
 775                 return 1;
 776         }
 777
 778 exit:
 779         kfree_skb(skb);
 780
 781         return r;
 782 }
 783
 784 static int pn544_hci_fw_download(struct nfc_hci_dev *hdev,
 785                                  const char *firmware_name)
 786 {
 787         struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
 788
 789         if (info->fw_download == NULL)
 790                 return -ENOTSUPP;
 791
 792         return info->fw_download(info->phy_id, firmware_name);
 793 }
 794
 795 static struct nfc_hci_ops pn544_hci_ops = {
 796         .open = pn544_hci_open,
 797         .close = pn544_hci_close,
 798         .hci_ready = pn544_hci_ready,
 799         .xmit = pn544_hci_xmit,
 800         .start_poll = pn544_hci_start_poll,
 801         .dep_link_up = pn544_hci_dep_link_up,
 802         .dep_link_down = pn544_hci_dep_link_down,
 803         .target_from_gate = pn544_hci_target_from_gate,
 804         .complete_target_discovered = pn544_hci_complete_target_discovered,
 805         .im_transceive = pn544_hci_im_transceive,
 806         .tm_send = pn544_hci_tm_send,
 807         .check_presence = pn544_hci_check_presence,
 808         .event_received = pn544_hci_event_received,
 809         .fw_download = pn544_hci_fw_download,
 810 };
 811
 812 int pn544_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops, char *llc_name,
 813                     int phy_headroom, int phy_tailroom, int phy_payload,
 814                     fw_download_t fw_download, struct nfc_hci_dev **hdev)
 815 {
 816         struct pn544_hci_info *info;
 817         u32 protocols;
 818         struct nfc_hci_init_data init_data;
 819         int r;
 820
 821         info = kzalloc(sizeof(struct pn544_hci_info), GFP_KERNEL);
 822         if (!info) {
 823                 pr_err("Cannot allocate memory for pn544_hci_info.\n");
 824                 r = -ENOMEM;
 825                 goto err_info_alloc;
 826         }
 827
 828         info->phy_ops = phy_ops;
 829         info->phy_id = phy_id;
 830         info->fw_download = fw_download;
 831         info->state = PN544_ST_COLD;
 832         mutex_init(&info->info_lock);
 833
 834         init_data.gate_count = ARRAY_SIZE(pn544_gates);
 835
 836         memcpy(init_data.gates, pn544_gates, sizeof(pn544_gates));
 837
 838         /*
 839          * TODO: Session id must include the driver name + some bus addr
 840          * persistent info to discriminate 2 identical chips
 841          */
 842         strcpy(init_data.session_id, "ID544HCI");
 843
 844         protocols = NFC_PROTO_JEWEL_MASK |
 845                     NFC_PROTO_MIFARE_MASK |
 846                     NFC_PROTO_FELICA_MASK |
 847                     NFC_PROTO_ISO14443_MASK |
 848                     NFC_PROTO_ISO14443_B_MASK |
 849                     NFC_PROTO_NFC_DEP_MASK;
 850
 851         info->hdev = nfc_hci_allocate_device(&pn544_hci_ops, &init_data, 0,
 852                                              protocols, llc_name,
 853                                              phy_headroom + PN544_CMDS_HEADROOM,
 854                                              phy_tailroom, phy_payload);
 855         if (!info->hdev) {
 856                 pr_err("Cannot allocate nfc hdev.\n");
 857                 r = -ENOMEM;
 858                 goto err_alloc_hdev;
 859         }
 860
 861         nfc_hci_set_clientdata(info->hdev, info);
 862
 863         r = nfc_hci_register_device(info->hdev);
 864         if (r)
 865                 goto err_regdev;
 866
 867         *hdev = info->hdev;
 868
 869         return 0;
 870
 871 err_regdev:
 872         nfc_hci_free_device(info->hdev);
 873
 874 err_alloc_hdev:
 875         kfree(info);
 876
 877 err_info_alloc:
 878         return r;
 879 }
 880 EXPORT_SYMBOL(pn544_hci_probe);
 881
 882 void pn544_hci_remove(struct nfc_hci_dev *hdev)
 883 {
 884         struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
 885
 886         nfc_hci_unregister_device(hdev);
 887         nfc_hci_free_device(hdev);
 888         kfree(info);
 889 }
 890 EXPORT_SYMBOL(pn544_hci_remove);
 891
 892 MODULE_LICENSE("GPL");
 893 MODULE_DESCRIPTION(DRIVER_DESC);