net/nfc/digital_technology.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * NFC Digital Protocol stack
   4  * Copyright (c) 2013, Intel Corporation.
   5  */
   6
   7 #define pr_fmt(fmt) "digital: %s: " fmt, __func__
   8
   9 #include "digital.h"
  10
  11 #define DIGITAL_CMD_SENS_REQ    0x26
  12 #define DIGITAL_CMD_ALL_REQ     0x52
  13 #define DIGITAL_CMD_SEL_REQ_CL1 0x93
  14 #define DIGITAL_CMD_SEL_REQ_CL2 0x95
  15 #define DIGITAL_CMD_SEL_REQ_CL3 0x97
  16
  17 #define DIGITAL_SDD_REQ_SEL_PAR 0x20
  18
  19 #define DIGITAL_SDD_RES_CT  0x88
  20 #define DIGITAL_SDD_RES_LEN 5
  21 #define DIGITAL_SEL_RES_LEN 1
  22
  23 #define DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res) (!((sel_res) & 0x04))
  24 #define DIGITAL_SEL_RES_IS_T2T(sel_res) (!((sel_res) & 0x60))
  25 #define DIGITAL_SEL_RES_IS_T4T(sel_res) ((sel_res) & 0x20)
  26 #define DIGITAL_SEL_RES_IS_NFC_DEP(sel_res) ((sel_res) & 0x40)
  27
  28 #define DIGITAL_SENS_RES_IS_T1T(sens_res) (((sens_res) & 0x0C00) == 0x0C00)
  29 #define DIGITAL_SENS_RES_IS_VALID(sens_res) \
  30         ((!((sens_res) & 0x001F) && (((sens_res) & 0x0C00) == 0x0C00)) || \
  31         (((sens_res) & 0x001F) && ((sens_res) & 0x0C00) != 0x0C00))
  32
  33 #define DIGITAL_MIFARE_READ_RES_LEN 16
  34 #define DIGITAL_MIFARE_ACK_RES  0x0A
  35
  36 #define DIGITAL_CMD_SENSB_REQ                   0x05
  37 #define DIGITAL_SENSB_ADVANCED                  BIT(5)
  38 #define DIGITAL_SENSB_EXTENDED                  BIT(4)
  39 #define DIGITAL_SENSB_ALLB_REQ                  BIT(3)
  40 #define DIGITAL_SENSB_N(n)                      ((n) & 0x7)
  41
  42 #define DIGITAL_CMD_SENSB_RES                   0x50
  43
  44 #define DIGITAL_CMD_ATTRIB_REQ                  0x1D
  45 #define DIGITAL_ATTRIB_P1_TR0_DEFAULT           (0x0 << 6)
  46 #define DIGITAL_ATTRIB_P1_TR1_DEFAULT           (0x0 << 4)
  47 #define DIGITAL_ATTRIB_P1_SUPRESS_EOS           BIT(3)
  48 #define DIGITAL_ATTRIB_P1_SUPRESS_SOS           BIT(2)
  49 #define DIGITAL_ATTRIB_P2_LISTEN_POLL_1         (0x0 << 6)
  50 #define DIGITAL_ATTRIB_P2_POLL_LISTEN_1         (0x0 << 4)
  51 #define DIGITAL_ATTRIB_P2_MAX_FRAME_256         0x8
  52 #define DIGITAL_ATTRIB_P4_DID(n)                ((n) & 0xf)
  53
  54 #define DIGITAL_CMD_SENSF_REQ   0x00
  55 #define DIGITAL_CMD_SENSF_RES   0x01
  56
  57 #define DIGITAL_SENSF_RES_MIN_LENGTH 17
  58 #define DIGITAL_SENSF_RES_RD_AP_B1   0x00
  59 #define DIGITAL_SENSF_RES_RD_AP_B2   0x8F
  60
  61 #define DIGITAL_SENSF_REQ_RC_NONE 0
  62 #define DIGITAL_SENSF_REQ_RC_SC   1
  63 #define DIGITAL_SENSF_REQ_RC_AP   2
  64
  65 #define DIGITAL_CMD_ISO15693_INVENTORY_REQ      0x01
  66
  67 #define DIGITAL_ISO15693_REQ_FLAG_DATA_RATE     BIT(1)
  68 #define DIGITAL_ISO15693_REQ_FLAG_INVENTORY     BIT(2)
  69 #define DIGITAL_ISO15693_REQ_FLAG_NB_SLOTS      BIT(5)
  70 #define DIGITAL_ISO15693_RES_FLAG_ERROR         BIT(0)
  71 #define DIGITAL_ISO15693_RES_IS_VALID(flags) \
  72         (!((flags) & DIGITAL_ISO15693_RES_FLAG_ERROR))
  73
  74 #define DIGITAL_ISO_DEP_I_PCB    0x02
  75 #define DIGITAL_ISO_DEP_PNI(pni) ((pni) & 0x01)
  76
  77 #define DIGITAL_ISO_DEP_PCB_TYPE(pcb) ((pcb) & 0xC0)
  78
  79 #define DIGITAL_ISO_DEP_I_BLOCK 0x00
  80
  81 #define DIGITAL_ISO_DEP_BLOCK_HAS_DID(pcb) ((pcb) & 0x08)
  82
  83 static const u8 digital_ats_fsc[] = {
  84          16,  24,  32,  40,  48,  64,  96, 128,
  85 };
  86
  87 #define DIGITAL_ATS_FSCI(t0) ((t0) & 0x0F)
  88 #define DIGITAL_SENSB_FSCI(pi2) (((pi2) & 0xF0) >> 4)
  89 #define DIGITAL_ATS_MAX_FSC  256
  90
  91 #define DIGITAL_RATS_BYTE1 0xE0
  92 #define DIGITAL_RATS_PARAM 0x80
  93
  94 struct digital_sdd_res {
  95         u8 nfcid1[4];
  96         u8 bcc;
  97 } __packed;
  98
  99 struct digital_sel_req {
 100         u8 sel_cmd;
 101         u8 b2;
 102         u8 nfcid1[4];
 103         u8 bcc;
 104 } __packed;
 105
 106 struct digital_sensb_req {
 107         u8 cmd;
 108         u8 afi;
 109         u8 param;
 110 } __packed;
 111
 112 struct digital_sensb_res {
 113         u8 cmd;
 114         u8 nfcid0[4];
 115         u8 app_data[4];
 116         u8 proto_info[3];
 117 } __packed;
 118
 119 struct digital_attrib_req {
 120         u8 cmd;
 121         u8 nfcid0[4];
 122         u8 param1;
 123         u8 param2;
 124         u8 param3;
 125         u8 param4;
 126 } __packed;
 127
 128 struct digital_attrib_res {
 129         u8 mbli_did;
 130 } __packed;
 131
 132 struct digital_sensf_req {
 133         u8 cmd;
 134         u8 sc1;
 135         u8 sc2;
 136         u8 rc;
 137         u8 tsn;
 138 } __packed;
 139
 140 struct digital_sensf_res {
 141         u8 cmd;
 142         u8 nfcid2[8];
 143         u8 pad0[2];
 144         u8 pad1[3];
 145         u8 mrti_check;
 146         u8 mrti_update;
 147         u8 pad2;
 148         u8 rd[2];
 149 } __packed;
 150
 151 struct digital_iso15693_inv_req {
 152         u8 flags;
 153         u8 cmd;
 154         u8 mask_len;
 155         u64 mask;
 156 } __packed;
 157
 158 struct digital_iso15693_inv_res {
 159         u8 flags;
 160         u8 dsfid;
 161         u64 uid;
 162 } __packed;
 163
 164 static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
 165                                    struct nfc_target *target);
 166
 167 int digital_in_iso_dep_pull_sod(struct nfc_digital_dev *ddev,
 168                                 struct sk_buff *skb)
 169 {
 170         u8 pcb;
 171         u8 block_type;
 172
 173         if (skb->len < 1)
 174                 return -EIO;
 175
 176         pcb = *skb->data;
 177         block_type = DIGITAL_ISO_DEP_PCB_TYPE(pcb);
 178
 179         /* No support fo R-block nor S-block */
 180         if (block_type != DIGITAL_ISO_DEP_I_BLOCK) {
 181                 pr_err("ISO_DEP R-block and S-block not supported\n");
 182                 return -EIO;
 183         }
 184
 185         if (DIGITAL_ISO_DEP_BLOCK_HAS_DID(pcb)) {
 186                 pr_err("DID field in ISO_DEP PCB not supported\n");
 187                 return -EIO;
 188         }
 189
 190         skb_pull(skb, 1);
 191
 192         return 0;
 193 }
 194
 195 int digital_in_iso_dep_push_sod(struct nfc_digital_dev *ddev,
 196                                 struct sk_buff *skb)
 197 {
 198         /*
 199          * Chaining not supported so skb->len + 1 PCB byte + 2 CRC bytes must
 200          * not be greater than remote FSC
 201          */
 202         if (skb->len + 3 > ddev->target_fsc)
 203                 return -EIO;
 204
 205         skb_push(skb, 1);
 206
 207         *skb->data = DIGITAL_ISO_DEP_I_PCB | ddev->curr_nfc_dep_pni;
 208
 209         ddev->curr_nfc_dep_pni =
 210                 DIGITAL_ISO_DEP_PNI(ddev->curr_nfc_dep_pni + 1);
 211
 212         return 0;
 213 }
 214
 215 static void digital_in_recv_ats(struct nfc_digital_dev *ddev, void *arg,
 216                                 struct sk_buff *resp)
 217 {
 218         struct nfc_target *target = arg;
 219         u8 fsdi;
 220         int rc;
 221
 222         if (IS_ERR(resp)) {
 223                 rc = PTR_ERR(resp);
 224                 resp = NULL;
 225                 goto exit;
 226         }
 227
 228         if (resp->len < 2) {
 229                 rc = -EIO;
 230                 goto exit;
 231         }
 232
 233         fsdi = DIGITAL_ATS_FSCI(resp->data[1]);
 234         if (fsdi >= 8)
 235                 ddev->target_fsc = DIGITAL_ATS_MAX_FSC;
 236         else
 237                 ddev->target_fsc = digital_ats_fsc[fsdi];
 238
 239         ddev->curr_nfc_dep_pni = 0;
 240
 241         rc = digital_target_found(ddev, target, NFC_PROTO_ISO14443);
 242
 243 exit:
 244         dev_kfree_skb(resp);
 245         kfree(target);
 246
 247         if (rc)
 248                 digital_poll_next_tech(ddev);
 249 }
 250
 251 static int digital_in_send_rats(struct nfc_digital_dev *ddev,
 252                                 struct nfc_target *target)
 253 {
 254         int rc;
 255         struct sk_buff *skb;
 256
 257         skb = digital_skb_alloc(ddev, 2);
 258         if (!skb)
 259                 return -ENOMEM;
 260
 261         skb_put_u8(skb, DIGITAL_RATS_BYTE1);
 262         skb_put_u8(skb, DIGITAL_RATS_PARAM);
 263
 264         rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_ats,
 265                                  target);
 266         if (rc)
 267                 kfree_skb(skb);
 268
 269         return rc;
 270 }
 271
 272 static void digital_in_recv_sel_res(struct nfc_digital_dev *ddev, void *arg,
 273                                     struct sk_buff *resp)
 274 {
 275         struct nfc_target *target = arg;
 276         int rc;
 277         u8 sel_res;
 278         u8 nfc_proto;
 279
 280         if (IS_ERR(resp)) {
 281                 rc = PTR_ERR(resp);
 282                 resp = NULL;
 283                 goto exit;
 284         }
 285
 286         if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
 287                 rc = digital_skb_check_crc_a(resp);
 288                 if (rc) {
 289                         PROTOCOL_ERR("4.4.1.3");
 290                         goto exit;
 291                 }
 292         }
 293
 294         if (resp->len != DIGITAL_SEL_RES_LEN) {
 295                 rc = -EIO;
 296                 goto exit;
 297         }
 298
 299         sel_res = resp->data[0];
 300
 301         if (!DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res)) {
 302                 rc = digital_in_send_sdd_req(ddev, target);
 303                 if (rc)
 304                         goto exit;
 305
 306                 goto exit_free_skb;
 307         }
 308
 309         target->sel_res = sel_res;
 310
 311         if (DIGITAL_SEL_RES_IS_T2T(sel_res)) {
 312                 nfc_proto = NFC_PROTO_MIFARE;
 313         } else if (DIGITAL_SEL_RES_IS_NFC_DEP(sel_res)) {
 314                 nfc_proto = NFC_PROTO_NFC_DEP;
 315         } else if (DIGITAL_SEL_RES_IS_T4T(sel_res)) {
 316                 rc = digital_in_send_rats(ddev, target);
 317                 if (rc)
 318                         goto exit;
 319                 /*
 320                  * Skip target_found and don't free it for now. This will be
 321                  * done when receiving the ATS
 322                  */
 323                 goto exit_free_skb;
 324         } else {
 325                 rc = -EOPNOTSUPP;
 326                 goto exit;
 327         }
 328
 329         rc = digital_target_found(ddev, target, nfc_proto);
 330
 331 exit:
 332         kfree(target);
 333
 334 exit_free_skb:
 335         dev_kfree_skb(resp);
 336
 337         if (rc)
 338                 digital_poll_next_tech(ddev);
 339 }
 340
 341 static int digital_in_send_sel_req(struct nfc_digital_dev *ddev,
 342                                    struct nfc_target *target,
 343                                    struct digital_sdd_res *sdd_res)
 344 {
 345         struct sk_buff *skb;
 346         struct digital_sel_req *sel_req;
 347         u8 sel_cmd;
 348         int rc;
 349
 350         skb = digital_skb_alloc(ddev, sizeof(struct digital_sel_req));
 351         if (!skb)
 352                 return -ENOMEM;
 353
 354         skb_put(skb, sizeof(struct digital_sel_req));
 355         sel_req = (struct digital_sel_req *)skb->data;
 356
 357         if (target->nfcid1_len <= 4)
 358                 sel_cmd = DIGITAL_CMD_SEL_REQ_CL1;
 359         else if (target->nfcid1_len < 10)
 360                 sel_cmd = DIGITAL_CMD_SEL_REQ_CL2;
 361         else
 362                 sel_cmd = DIGITAL_CMD_SEL_REQ_CL3;
 363
 364         sel_req->sel_cmd = sel_cmd;
 365         sel_req->b2 = 0x70;
 366         memcpy(sel_req->nfcid1, sdd_res->nfcid1, 4);
 367         sel_req->bcc = sdd_res->bcc;
 368
 369         if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
 370                 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
 371                                 NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A);
 372                 if (rc)
 373                         goto exit;
 374         } else {
 375                 digital_skb_add_crc_a(skb);
 376         }
 377
 378         rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sel_res,
 379                                  target);
 380 exit:
 381         if (rc)
 382                 kfree_skb(skb);
 383
 384         return rc;
 385 }
 386
 387 static void digital_in_recv_sdd_res(struct nfc_digital_dev *ddev, void *arg,
 388                                     struct sk_buff *resp)
 389 {
 390         struct nfc_target *target = arg;
 391         struct digital_sdd_res *sdd_res;
 392         int rc;
 393         u8 offset, size;
 394         u8 i, bcc;
 395
 396         if (IS_ERR(resp)) {
 397                 rc = PTR_ERR(resp);
 398                 resp = NULL;
 399                 goto exit;
 400         }
 401
 402         if (resp->len < DIGITAL_SDD_RES_LEN) {
 403                 PROTOCOL_ERR("4.7.2.8");
 404                 rc = -EINVAL;
 405                 goto exit;
 406         }
 407
 408         sdd_res = (struct digital_sdd_res *)resp->data;
 409
 410         for (i = 0, bcc = 0; i < 4; i++)
 411                 bcc ^= sdd_res->nfcid1[i];
 412
 413         if (bcc != sdd_res->bcc) {
 414                 PROTOCOL_ERR("4.7.2.6");
 415                 rc = -EINVAL;
 416                 goto exit;
 417         }
 418
 419         if (sdd_res->nfcid1[0] == DIGITAL_SDD_RES_CT) {
 420                 offset = 1;
 421                 size = 3;
 422         } else {
 423                 offset = 0;
 424                 size = 4;
 425         }
 426
 427         memcpy(target->nfcid1 + target->nfcid1_len, sdd_res->nfcid1 + offset,
 428                size);
 429         target->nfcid1_len += size;
 430
 431         rc = digital_in_send_sel_req(ddev, target, sdd_res);
 432
 433 exit:
 434         dev_kfree_skb(resp);
 435
 436         if (rc) {
 437                 kfree(target);
 438                 digital_poll_next_tech(ddev);
 439         }
 440 }
 441
 442 static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
 443                                    struct nfc_target *target)
 444 {
 445         int rc;
 446         struct sk_buff *skb;
 447         u8 sel_cmd;
 448
 449         rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
 450                                      NFC_DIGITAL_FRAMING_NFCA_STANDARD);
 451         if (rc)
 452                 return rc;
 453
 454         skb = digital_skb_alloc(ddev, 2);
 455         if (!skb)
 456                 return -ENOMEM;
 457
 458         if (target->nfcid1_len == 0)
 459                 sel_cmd = DIGITAL_CMD_SEL_REQ_CL1;
 460         else if (target->nfcid1_len == 3)
 461                 sel_cmd = DIGITAL_CMD_SEL_REQ_CL2;
 462         else
 463                 sel_cmd = DIGITAL_CMD_SEL_REQ_CL3;
 464
 465         skb_put_u8(skb, sel_cmd);
 466         skb_put_u8(skb, DIGITAL_SDD_REQ_SEL_PAR);
 467
 468         return digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sdd_res,
 469                                    target);
 470 }
 471
 472 static void digital_in_recv_sens_res(struct nfc_digital_dev *ddev, void *arg,
 473                                      struct sk_buff *resp)
 474 {
 475         struct nfc_target *target = NULL;
 476         int rc;
 477
 478         if (IS_ERR(resp)) {
 479                 rc = PTR_ERR(resp);
 480                 resp = NULL;
 481                 goto exit;
 482         }
 483
 484         if (resp->len < sizeof(u16)) {
 485                 rc = -EIO;
 486                 goto exit;
 487         }
 488
 489         target = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
 490         if (!target) {
 491                 rc = -ENOMEM;
 492                 goto exit;
 493         }
 494
 495         target->sens_res = __le16_to_cpu(*(__le16 *)resp->data);
 496
 497         if (!DIGITAL_SENS_RES_IS_VALID(target->sens_res)) {
 498                 PROTOCOL_ERR("4.6.3.3");
 499                 rc = -EINVAL;
 500                 goto exit;
 501         }
 502
 503         if (DIGITAL_SENS_RES_IS_T1T(target->sens_res))
 504                 rc = digital_target_found(ddev, target, NFC_PROTO_JEWEL);
 505         else
 506                 rc = digital_in_send_sdd_req(ddev, target);
 507
 508 exit:
 509         dev_kfree_skb(resp);
 510
 511         if (rc) {
 512                 kfree(target);
 513                 digital_poll_next_tech(ddev);
 514         }
 515 }
 516
 517 int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech)
 518 {
 519         struct sk_buff *skb;
 520         int rc;
 521
 522         rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
 523                                      NFC_DIGITAL_RF_TECH_106A);
 524         if (rc)
 525                 return rc;
 526
 527         rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
 528                                      NFC_DIGITAL_FRAMING_NFCA_SHORT);
 529         if (rc)
 530                 return rc;
 531
 532         skb = digital_skb_alloc(ddev, 1);
 533         if (!skb)
 534                 return -ENOMEM;
 535
 536         skb_put_u8(skb, DIGITAL_CMD_SENS_REQ);
 537
 538         rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sens_res, NULL);
 539         if (rc)
 540                 kfree_skb(skb);
 541
 542         return rc;
 543 }
 544
 545 int digital_in_recv_mifare_res(struct sk_buff *resp)
 546 {
 547         /* Successful READ command response is 16 data bytes + 2 CRC bytes long.
 548          * Since the driver can't differentiate a ACK/NACK response from a valid
 549          * READ response, the CRC calculation must be handled at digital level
 550          * even if the driver supports it for this technology.
 551          */
 552         if (resp->len == DIGITAL_MIFARE_READ_RES_LEN + DIGITAL_CRC_LEN) {
 553                 if (digital_skb_check_crc_a(resp)) {
 554                         PROTOCOL_ERR("9.4.1.2");
 555                         return -EIO;
 556                 }
 557
 558                 return 0;
 559         }
 560
 561         /* ACK response (i.e. successful WRITE). */
 562         if (resp->len == 1 && resp->data[0] == DIGITAL_MIFARE_ACK_RES) {
 563                 resp->data[0] = 0;
 564                 return 0;
 565         }
 566
 567         /* NACK and any other responses are treated as error. */
 568         return -EIO;
 569 }
 570
 571 static void digital_in_recv_attrib_res(struct nfc_digital_dev *ddev, void *arg,
 572                                        struct sk_buff *resp)
 573 {
 574         struct nfc_target *target = arg;
 575         struct digital_attrib_res *attrib_res;
 576         int rc;
 577
 578         if (IS_ERR(resp)) {
 579                 rc = PTR_ERR(resp);
 580                 resp = NULL;
 581                 goto exit;
 582         }
 583
 584         if (resp->len < sizeof(*attrib_res)) {
 585                 PROTOCOL_ERR("12.6.2");
 586                 rc = -EIO;
 587                 goto exit;
 588         }
 589
 590         attrib_res = (struct digital_attrib_res *)resp->data;
 591
 592         if (attrib_res->mbli_did & 0x0f) {
 593                 PROTOCOL_ERR("12.6.2.1");
 594                 rc = -EIO;
 595                 goto exit;
 596         }
 597
 598         rc = digital_target_found(ddev, target, NFC_PROTO_ISO14443_B);
 599
 600 exit:
 601         dev_kfree_skb(resp);
 602         kfree(target);
 603
 604         if (rc)
 605                 digital_poll_next_tech(ddev);
 606 }
 607
 608 static int digital_in_send_attrib_req(struct nfc_digital_dev *ddev,
 609                                struct nfc_target *target,
 610                                struct digital_sensb_res *sensb_res)
 611 {
 612         struct digital_attrib_req *attrib_req;
 613         struct sk_buff *skb;
 614         int rc;
 615
 616         skb = digital_skb_alloc(ddev, sizeof(*attrib_req));
 617         if (!skb)
 618                 return -ENOMEM;
 619
 620         attrib_req = skb_put(skb, sizeof(*attrib_req));
 621
 622         attrib_req->cmd = DIGITAL_CMD_ATTRIB_REQ;
 623         memcpy(attrib_req->nfcid0, sensb_res->nfcid0,
 624                sizeof(attrib_req->nfcid0));
 625         attrib_req->param1 = DIGITAL_ATTRIB_P1_TR0_DEFAULT |
 626                              DIGITAL_ATTRIB_P1_TR1_DEFAULT;
 627         attrib_req->param2 = DIGITAL_ATTRIB_P2_LISTEN_POLL_1 |
 628                              DIGITAL_ATTRIB_P2_POLL_LISTEN_1 |
 629                              DIGITAL_ATTRIB_P2_MAX_FRAME_256;
 630         attrib_req->param3 = sensb_res->proto_info[1] & 0x07;
 631         attrib_req->param4 = DIGITAL_ATTRIB_P4_DID(0);
 632
 633         rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_attrib_res,
 634                                  target);
 635         if (rc)
 636                 kfree_skb(skb);
 637
 638         return rc;
 639 }
 640
 641 static void digital_in_recv_sensb_res(struct nfc_digital_dev *ddev, void *arg,
 642                                       struct sk_buff *resp)
 643 {
 644         struct nfc_target *target = NULL;
 645         struct digital_sensb_res *sensb_res;
 646         u8 fsci;
 647         int rc;
 648
 649         if (IS_ERR(resp)) {
 650                 rc = PTR_ERR(resp);
 651                 resp = NULL;
 652                 goto exit;
 653         }
 654
 655         if (resp->len != sizeof(*sensb_res)) {
 656                 PROTOCOL_ERR("5.6.2.1");
 657                 rc = -EIO;
 658                 goto exit;
 659         }
 660
 661         sensb_res = (struct digital_sensb_res *)resp->data;
 662
 663         if (sensb_res->cmd != DIGITAL_CMD_SENSB_RES) {
 664                 PROTOCOL_ERR("5.6.2");
 665                 rc = -EIO;
 666                 goto exit;
 667         }
 668
 669         if (!(sensb_res->proto_info[1] & BIT(0))) {
 670                 PROTOCOL_ERR("5.6.2.12");
 671                 rc = -EIO;
 672                 goto exit;
 673         }
 674
 675         if (sensb_res->proto_info[1] & BIT(3)) {
 676                 PROTOCOL_ERR("5.6.2.16");
 677                 rc = -EIO;
 678                 goto exit;
 679         }
 680
 681         fsci = DIGITAL_SENSB_FSCI(sensb_res->proto_info[1]);
 682         if (fsci >= 8)
 683                 ddev->target_fsc = DIGITAL_ATS_MAX_FSC;
 684         else
 685                 ddev->target_fsc = digital_ats_fsc[fsci];
 686
 687         target = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
 688         if (!target) {
 689                 rc = -ENOMEM;
 690                 goto exit;
 691         }
 692
 693         rc = digital_in_send_attrib_req(ddev, target, sensb_res);
 694
 695 exit:
 696         dev_kfree_skb(resp);
 697
 698         if (rc) {
 699                 kfree(target);
 700                 digital_poll_next_tech(ddev);
 701         }
 702 }
 703
 704 int digital_in_send_sensb_req(struct nfc_digital_dev *ddev, u8 rf_tech)
 705 {
 706         struct digital_sensb_req *sensb_req;
 707         struct sk_buff *skb;
 708         int rc;
 709
 710         rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
 711                                      NFC_DIGITAL_RF_TECH_106B);
 712         if (rc)
 713                 return rc;
 714
 715         rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
 716                                      NFC_DIGITAL_FRAMING_NFCB);
 717         if (rc)
 718                 return rc;
 719
 720         skb = digital_skb_alloc(ddev, sizeof(*sensb_req));
 721         if (!skb)
 722                 return -ENOMEM;
 723
 724         sensb_req = skb_put(skb, sizeof(*sensb_req));
 725
 726         sensb_req->cmd = DIGITAL_CMD_SENSB_REQ;
 727         sensb_req->afi = 0x00; /* All families and sub-families */
 728         sensb_req->param = DIGITAL_SENSB_N(0);
 729
 730         rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sensb_res,
 731                                  NULL);
 732         if (rc)
 733                 kfree_skb(skb);
 734
 735         return rc;
 736 }
 737
 738 static void digital_in_recv_sensf_res(struct nfc_digital_dev *ddev, void *arg,
 739                                    struct sk_buff *resp)
 740 {
 741         int rc;
 742         u8 proto;
 743         struct nfc_target target;
 744         struct digital_sensf_res *sensf_res;
 745
 746         if (IS_ERR(resp)) {
 747                 rc = PTR_ERR(resp);
 748                 resp = NULL;
 749                 goto exit;
 750         }
 751
 752         if (resp->len < DIGITAL_SENSF_RES_MIN_LENGTH) {
 753                 rc = -EIO;
 754                 goto exit;
 755         }
 756
 757         if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
 758                 rc = digital_skb_check_crc_f(resp);
 759                 if (rc) {
 760                         PROTOCOL_ERR("6.4.1.8");
 761                         goto exit;
 762                 }
 763         }
 764
 765         skb_pull(resp, 1);
 766
 767         memset(&target, 0, sizeof(struct nfc_target));
 768
 769         sensf_res = (struct digital_sensf_res *)resp->data;
 770
 771         memcpy(target.sensf_res, sensf_res, resp->len);
 772         target.sensf_res_len = resp->len;
 773
 774         memcpy(target.nfcid2, sensf_res->nfcid2, NFC_NFCID2_MAXSIZE);
 775         target.nfcid2_len = NFC_NFCID2_MAXSIZE;
 776
 777         if (target.nfcid2[0] == DIGITAL_SENSF_NFCID2_NFC_DEP_B1 &&
 778             target.nfcid2[1] == DIGITAL_SENSF_NFCID2_NFC_DEP_B2)
 779                 proto = NFC_PROTO_NFC_DEP;
 780         else
 781                 proto = NFC_PROTO_FELICA;
 782
 783         rc = digital_target_found(ddev, &target, proto);
 784
 785 exit:
 786         dev_kfree_skb(resp);
 787
 788         if (rc)
 789                 digital_poll_next_tech(ddev);
 790 }
 791
 792 int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech)
 793 {
 794         struct digital_sensf_req *sensf_req;
 795         struct sk_buff *skb;
 796         int rc;
 797         u8 size;
 798
 799         rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
 800         if (rc)
 801                 return rc;
 802
 803         rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
 804                                      NFC_DIGITAL_FRAMING_NFCF);
 805         if (rc)
 806                 return rc;
 807
 808         size = sizeof(struct digital_sensf_req);
 809
 810         skb = digital_skb_alloc(ddev, size);
 811         if (!skb)
 812                 return -ENOMEM;
 813
 814         skb_put(skb, size);
 815
 816         sensf_req = (struct digital_sensf_req *)skb->data;
 817         sensf_req->cmd = DIGITAL_CMD_SENSF_REQ;
 818         sensf_req->sc1 = 0xFF;
 819         sensf_req->sc2 = 0xFF;
 820         sensf_req->rc = 0;
 821         sensf_req->tsn = 0;
 822
 823         *(u8 *)skb_push(skb, 1) = size + 1;
 824
 825         if (!DIGITAL_DRV_CAPS_IN_CRC(ddev))
 826                 digital_skb_add_crc_f(skb);
 827
 828         rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sensf_res,
 829                                  NULL);
 830         if (rc)
 831                 kfree_skb(skb);
 832
 833         return rc;
 834 }
 835
 836 static void digital_in_recv_iso15693_inv_res(struct nfc_digital_dev *ddev,
 837                 void *arg, struct sk_buff *resp)
 838 {
 839         struct digital_iso15693_inv_res *res;
 840         struct nfc_target *target = NULL;
 841         int rc;
 842
 843         if (IS_ERR(resp)) {
 844                 rc = PTR_ERR(resp);
 845                 resp = NULL;
 846                 goto out_free_skb;
 847         }
 848
 849         if (resp->len != sizeof(*res)) {
 850                 rc = -EIO;
 851                 goto out_free_skb;
 852         }
 853
 854         res = (struct digital_iso15693_inv_res *)resp->data;
 855
 856         if (!DIGITAL_ISO15693_RES_IS_VALID(res->flags)) {
 857                 PROTOCOL_ERR("ISO15693 - 10.3.1");
 858                 rc = -EINVAL;
 859                 goto out_free_skb;
 860         }
 861
 862         target = kzalloc(sizeof(*target), GFP_KERNEL);
 863         if (!target) {
 864                 rc = -ENOMEM;
 865                 goto out_free_skb;
 866         }
 867
 868         target->is_iso15693 = 1;
 869         target->iso15693_dsfid = res->dsfid;
 870         memcpy(target->iso15693_uid, &res->uid, sizeof(target->iso15693_uid));
 871
 872         rc = digital_target_found(ddev, target, NFC_PROTO_ISO15693);
 873
 874         kfree(target);
 875
 876 out_free_skb:
 877         dev_kfree_skb(resp);
 878
 879         if (rc)
 880                 digital_poll_next_tech(ddev);
 881 }
 882
 883 int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech)
 884 {
 885         struct digital_iso15693_inv_req *req;
 886         struct sk_buff *skb;
 887         int rc;
 888
 889         rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
 890                                      NFC_DIGITAL_RF_TECH_ISO15693);
 891         if (rc)
 892                 return rc;
 893
 894         rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
 895                                      NFC_DIGITAL_FRAMING_ISO15693_INVENTORY);
 896         if (rc)
 897                 return rc;
 898
 899         skb = digital_skb_alloc(ddev, sizeof(*req));
 900         if (!skb)
 901                 return -ENOMEM;
 902
 903         skb_put(skb, sizeof(*req) - sizeof(req->mask)); /* No mask */
 904         req = (struct digital_iso15693_inv_req *)skb->data;
 905
 906         /* Single sub-carrier, high data rate, no AFI, single slot
 907          * Inventory command
 908          */
 909         req->flags = DIGITAL_ISO15693_REQ_FLAG_DATA_RATE |
 910                      DIGITAL_ISO15693_REQ_FLAG_INVENTORY |
 911                      DIGITAL_ISO15693_REQ_FLAG_NB_SLOTS;
 912         req->cmd = DIGITAL_CMD_ISO15693_INVENTORY_REQ;
 913         req->mask_len = 0;
 914
 915         rc = digital_in_send_cmd(ddev, skb, 30,
 916                                  digital_in_recv_iso15693_inv_res, NULL);
 917         if (rc)
 918                 kfree_skb(skb);
 919
 920         return rc;
 921 }
 922
 923 static int digital_tg_send_sel_res(struct nfc_digital_dev *ddev)
 924 {
 925         struct sk_buff *skb;
 926         int rc;
 927
 928         skb = digital_skb_alloc(ddev, 1);
 929         if (!skb)
 930                 return -ENOMEM;
 931
 932         skb_put_u8(skb, DIGITAL_SEL_RES_NFC_DEP);
 933
 934         if (!DIGITAL_DRV_CAPS_TG_CRC(ddev))
 935                 digital_skb_add_crc_a(skb);
 936
 937         rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
 938                                      NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE);
 939         if (rc) {
 940                 kfree_skb(skb);
 941                 return rc;
 942         }
 943
 944         rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_atr_req,
 945                                  NULL);
 946         if (rc)
 947                 kfree_skb(skb);
 948
 949         return rc;
 950 }
 951
 952 static void digital_tg_recv_sel_req(struct nfc_digital_dev *ddev, void *arg,
 953                                     struct sk_buff *resp)
 954 {
 955         int rc;
 956
 957         if (IS_ERR(resp)) {
 958                 rc = PTR_ERR(resp);
 959                 resp = NULL;
 960                 goto exit;
 961         }
 962
 963         if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) {
 964                 rc = digital_skb_check_crc_a(resp);
 965                 if (rc) {
 966                         PROTOCOL_ERR("4.4.1.3");
 967                         goto exit;
 968                 }
 969         }
 970
 971         /* Silently ignore SEL_REQ content and send a SEL_RES for NFC-DEP */
 972
 973         rc = digital_tg_send_sel_res(ddev);
 974
 975 exit:
 976         if (rc)
 977                 digital_poll_next_tech(ddev);
 978
 979         dev_kfree_skb(resp);
 980 }
 981
 982 static int digital_tg_send_sdd_res(struct nfc_digital_dev *ddev)
 983 {
 984         struct sk_buff *skb;
 985         struct digital_sdd_res *sdd_res;
 986         int rc, i;
 987
 988         skb = digital_skb_alloc(ddev, sizeof(struct digital_sdd_res));
 989         if (!skb)
 990                 return -ENOMEM;
 991
 992         skb_put(skb, sizeof(struct digital_sdd_res));
 993         sdd_res = (struct digital_sdd_res *)skb->data;
 994
 995         sdd_res->nfcid1[0] = 0x08;
 996         get_random_bytes(sdd_res->nfcid1 + 1, 3);
 997
 998         sdd_res->bcc = 0;
 999         for (i = 0; i < 4; i++)
1000                 sdd_res->bcc ^= sdd_res->nfcid1[i];
1001
1002         rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1003                                 NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A);
1004         if (rc) {
1005                 kfree_skb(skb);
1006                 return rc;
1007         }
1008
1009         rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_sel_req,
1010                                  NULL);
1011         if (rc)
1012                 kfree_skb(skb);
1013
1014         return rc;
1015 }
1016
1017 static void digital_tg_recv_sdd_req(struct nfc_digital_dev *ddev, void *arg,
1018                                     struct sk_buff *resp)
1019 {
1020         u8 *sdd_req;
1021         int rc;
1022
1023         if (IS_ERR(resp)) {
1024                 rc = PTR_ERR(resp);
1025                 resp = NULL;
1026                 goto exit;
1027         }
1028
1029         sdd_req = resp->data;
1030
1031         if (resp->len < 2 || sdd_req[0] != DIGITAL_CMD_SEL_REQ_CL1 ||
1032             sdd_req[1] != DIGITAL_SDD_REQ_SEL_PAR) {
1033                 rc = -EINVAL;
1034                 goto exit;
1035         }
1036
1037         rc = digital_tg_send_sdd_res(ddev);
1038
1039 exit:
1040         if (rc)
1041                 digital_poll_next_tech(ddev);
1042
1043         dev_kfree_skb(resp);
1044 }
1045
1046 static int digital_tg_send_sens_res(struct nfc_digital_dev *ddev)
1047 {
1048         struct sk_buff *skb;
1049         u8 *sens_res;
1050         int rc;
1051
1052         skb = digital_skb_alloc(ddev, 2);
1053         if (!skb)
1054                 return -ENOMEM;
1055
1056         sens_res = skb_put(skb, 2);
1057
1058         sens_res[0] = (DIGITAL_SENS_RES_NFC_DEP >> 8) & 0xFF;
1059         sens_res[1] = DIGITAL_SENS_RES_NFC_DEP & 0xFF;
1060
1061         rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1062                                      NFC_DIGITAL_FRAMING_NFCA_STANDARD);
1063         if (rc) {
1064                 kfree_skb(skb);
1065                 return rc;
1066         }
1067
1068         rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_sdd_req,
1069                                  NULL);
1070         if (rc)
1071                 kfree_skb(skb);
1072
1073         return rc;
1074 }
1075
1076 void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg,
1077                               struct sk_buff *resp)
1078 {
1079         u8 sens_req;
1080         int rc;
1081
1082         if (IS_ERR(resp)) {
1083                 rc = PTR_ERR(resp);
1084                 resp = NULL;
1085                 goto exit;
1086         }
1087
1088         sens_req = resp->data[0];
1089
1090         if (!resp->len || (sens_req != DIGITAL_CMD_SENS_REQ &&
1091             sens_req != DIGITAL_CMD_ALL_REQ)) {
1092                 rc = -EINVAL;
1093                 goto exit;
1094         }
1095
1096         rc = digital_tg_send_sens_res(ddev);
1097
1098 exit:
1099         if (rc)
1100                 digital_poll_next_tech(ddev);
1101
1102         dev_kfree_skb(resp);
1103 }
1104
1105 static void digital_tg_recv_atr_or_sensf_req(struct nfc_digital_dev *ddev,
1106                 void *arg, struct sk_buff *resp)
1107 {
1108         if (!IS_ERR(resp) && (resp->len >= 2) &&
1109                         (resp->data[1] == DIGITAL_CMD_SENSF_REQ))
1110                 digital_tg_recv_sensf_req(ddev, arg, resp);
1111         else
1112                 digital_tg_recv_atr_req(ddev, arg, resp);
1113
1114         return;
1115 }
1116
1117 static int digital_tg_send_sensf_res(struct nfc_digital_dev *ddev,
1118                               struct digital_sensf_req *sensf_req)
1119 {
1120         struct sk_buff *skb;
1121         u8 size;
1122         int rc;
1123         struct digital_sensf_res *sensf_res;
1124
1125         size = sizeof(struct digital_sensf_res);
1126
1127         if (sensf_req->rc == DIGITAL_SENSF_REQ_RC_NONE)
1128                 size -= sizeof(sensf_res->rd);
1129
1130         skb = digital_skb_alloc(ddev, size);
1131         if (!skb)
1132                 return -ENOMEM;
1133
1134         skb_put(skb, size);
1135
1136         sensf_res = (struct digital_sensf_res *)skb->data;
1137
1138         memset(sensf_res, 0, size);
1139
1140         sensf_res->cmd = DIGITAL_CMD_SENSF_RES;
1141         sensf_res->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
1142         sensf_res->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
1143         get_random_bytes(&sensf_res->nfcid2[2], 6);
1144
1145         switch (sensf_req->rc) {
1146         case DIGITAL_SENSF_REQ_RC_SC:
1147                 sensf_res->rd[0] = sensf_req->sc1;
1148                 sensf_res->rd[1] = sensf_req->sc2;
1149                 break;
1150         case DIGITAL_SENSF_REQ_RC_AP:
1151                 sensf_res->rd[0] = DIGITAL_SENSF_RES_RD_AP_B1;
1152                 sensf_res->rd[1] = DIGITAL_SENSF_RES_RD_AP_B2;
1153                 break;
1154         }
1155
1156         *(u8 *)skb_push(skb, sizeof(u8)) = size + 1;
1157
1158         if (!DIGITAL_DRV_CAPS_TG_CRC(ddev))
1159                 digital_skb_add_crc_f(skb);
1160
1161         rc = digital_tg_send_cmd(ddev, skb, 300,
1162                                  digital_tg_recv_atr_or_sensf_req, NULL);
1163         if (rc)
1164                 kfree_skb(skb);
1165
1166         return rc;
1167 }
1168
1169 void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg,
1170                                struct sk_buff *resp)
1171 {
1172         struct digital_sensf_req *sensf_req;
1173         int rc;
1174
1175         if (IS_ERR(resp)) {
1176                 rc = PTR_ERR(resp);
1177                 resp = NULL;
1178                 goto exit;
1179         }
1180
1181         if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) {
1182                 rc = digital_skb_check_crc_f(resp);
1183                 if (rc) {
1184                         PROTOCOL_ERR("6.4.1.8");
1185                         goto exit;
1186                 }
1187         }
1188
1189         if (resp->len != sizeof(struct digital_sensf_req) + 1) {
1190                 rc = -EINVAL;
1191                 goto exit;
1192         }
1193
1194         skb_pull(resp, 1);
1195         sensf_req = (struct digital_sensf_req *)resp->data;
1196
1197         if (sensf_req->cmd != DIGITAL_CMD_SENSF_REQ) {
1198                 rc = -EINVAL;
1199                 goto exit;
1200         }
1201
1202         rc = digital_tg_send_sensf_res(ddev, sensf_req);
1203
1204 exit:
1205         if (rc)
1206                 digital_poll_next_tech(ddev);
1207
1208         dev_kfree_skb(resp);
1209 }
1210
1211 static int digital_tg_config_nfca(struct nfc_digital_dev *ddev)
1212 {
1213         int rc;
1214
1215         rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
1216                                      NFC_DIGITAL_RF_TECH_106A);
1217         if (rc)
1218                 return rc;
1219
1220         return digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1221                                        NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);
1222 }
1223
1224 int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech)
1225 {
1226         int rc;
1227
1228         rc = digital_tg_config_nfca(ddev);
1229         if (rc)
1230                 return rc;
1231
1232         return digital_tg_listen(ddev, 300, digital_tg_recv_sens_req, NULL);
1233 }
1234
1235 static int digital_tg_config_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech)
1236 {
1237         int rc;
1238
1239         rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
1240         if (rc)
1241                 return rc;
1242
1243         return digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1244                                        NFC_DIGITAL_FRAMING_NFCF_NFC_DEP);
1245 }
1246
1247 int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech)
1248 {
1249         int rc;
1250
1251         rc = digital_tg_config_nfcf(ddev, rf_tech);
1252         if (rc)
1253                 return rc;
1254
1255         return digital_tg_listen(ddev, 300, digital_tg_recv_sensf_req, NULL);
1256 }
1257
1258 void digital_tg_recv_md_req(struct nfc_digital_dev *ddev, void *arg,
1259                             struct sk_buff *resp)
1260 {
1261         u8 rf_tech;
1262         int rc;
1263
1264         if (IS_ERR(resp)) {
1265                 resp = NULL;
1266                 goto exit_free_skb;
1267         }
1268
1269         rc = ddev->ops->tg_get_rf_tech(ddev, &rf_tech);
1270         if (rc)
1271                 goto exit_free_skb;
1272
1273         switch (rf_tech) {
1274         case NFC_DIGITAL_RF_TECH_106A:
1275                 rc = digital_tg_config_nfca(ddev);
1276                 if (rc)
1277                         goto exit_free_skb;
1278                 digital_tg_recv_sens_req(ddev, arg, resp);
1279                 break;
1280         case NFC_DIGITAL_RF_TECH_212F:
1281         case NFC_DIGITAL_RF_TECH_424F:
1282                 rc = digital_tg_config_nfcf(ddev, rf_tech);
1283                 if (rc)
1284                         goto exit_free_skb;
1285                 digital_tg_recv_sensf_req(ddev, arg, resp);
1286                 break;
1287         default:
1288                 goto exit_free_skb;
1289         }
1290
1291         return;
1292
1293 exit_free_skb:
1294         digital_poll_next_tech(ddev);
1295         dev_kfree_skb(resp);
1296 }