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   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
  83static 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
  94struct digital_sdd_res {
  95	u8 nfcid1[4];
  96	u8 bcc;
  97} __packed;
  98
  99struct digital_sel_req {
 100	u8 sel_cmd;
 101	u8 b2;
 102	u8 nfcid1[4];
 103	u8 bcc;
 104} __packed;
 105
 106struct digital_sensb_req {
 107	u8 cmd;
 108	u8 afi;
 109	u8 param;
 110} __packed;
 111
 112struct digital_sensb_res {
 113	u8 cmd;
 114	u8 nfcid0[4];
 115	u8 app_data[4];
 116	u8 proto_info[3];
 117} __packed;
 118
 119struct 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
 128struct digital_attrib_res {
 129	u8 mbli_did;
 130} __packed;
 131
 132struct digital_sensf_req {
 133	u8 cmd;
 134	u8 sc1;
 135	u8 sc2;
 136	u8 rc;
 137	u8 tsn;
 138} __packed;
 139
 140struct 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
 151struct digital_iso15693_inv_req {
 152	u8 flags;
 153	u8 cmd;
 154	u8 mask_len;
 155	u64 mask;
 156} __packed;
 157
 158struct digital_iso15693_inv_res {
 159	u8 flags;
 160	u8 dsfid;
 161	u64 uid;
 162} __packed;
 163
 164static int digital_in_send_sdd_req(struct nfc_digital_dev *ddev,
 165				   struct nfc_target *target);
 166
 167int 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
 195int 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
 215static 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
 243exit:
 244	dev_kfree_skb(resp);
 245	kfree(target);
 246
 247	if (rc)
 248		digital_poll_next_tech(ddev);
 249}
 250
 251static 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
 272static 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
 331exit:
 332	kfree(target);
 333
 334exit_free_skb:
 335	dev_kfree_skb(resp);
 336
 337	if (rc)
 338		digital_poll_next_tech(ddev);
 339}
 340
 341static 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);
 380exit:
 381	if (rc)
 382		kfree_skb(skb);
 383
 384	return rc;
 385}
 386
 387static 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
 433exit:
 434	dev_kfree_skb(resp);
 435
 436	if (rc) {
 437		kfree(target);
 438		digital_poll_next_tech(ddev);
 439	}
 440}
 441
 442static 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	rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sdd_res,
 469				 target);
 470	if (rc)
 471		kfree_skb(skb);
 472
 473	return rc;
 474}
 475
 476static void digital_in_recv_sens_res(struct nfc_digital_dev *ddev, void *arg,
 477				     struct sk_buff *resp)
 478{
 479	struct nfc_target *target = NULL;
 480	int rc;
 481
 482	if (IS_ERR(resp)) {
 483		rc = PTR_ERR(resp);
 484		resp = NULL;
 485		goto exit;
 486	}
 487
 488	if (resp->len < sizeof(u16)) {
 489		rc = -EIO;
 490		goto exit;
 491	}
 492
 493	target = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
 494	if (!target) {
 495		rc = -ENOMEM;
 496		goto exit;
 497	}
 498
 499	target->sens_res = __le16_to_cpu(*(__le16 *)resp->data);
 500
 501	if (!DIGITAL_SENS_RES_IS_VALID(target->sens_res)) {
 502		PROTOCOL_ERR("4.6.3.3");
 503		rc = -EINVAL;
 504		goto exit;
 505	}
 506
 507	if (DIGITAL_SENS_RES_IS_T1T(target->sens_res))
 508		rc = digital_target_found(ddev, target, NFC_PROTO_JEWEL);
 509	else
 510		rc = digital_in_send_sdd_req(ddev, target);
 511
 512exit:
 513	dev_kfree_skb(resp);
 514
 515	if (rc) {
 516		kfree(target);
 517		digital_poll_next_tech(ddev);
 518	}
 519}
 520
 521int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech)
 522{
 523	struct sk_buff *skb;
 524	int rc;
 525
 526	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
 527				     NFC_DIGITAL_RF_TECH_106A);
 528	if (rc)
 529		return rc;
 530
 531	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
 532				     NFC_DIGITAL_FRAMING_NFCA_SHORT);
 533	if (rc)
 534		return rc;
 535
 536	skb = digital_skb_alloc(ddev, 1);
 537	if (!skb)
 538		return -ENOMEM;
 539
 540	skb_put_u8(skb, DIGITAL_CMD_SENS_REQ);
 541
 542	rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sens_res, NULL);
 543	if (rc)
 544		kfree_skb(skb);
 545
 546	return rc;
 547}
 548
 549int digital_in_recv_mifare_res(struct sk_buff *resp)
 550{
 551	/* Successful READ command response is 16 data bytes + 2 CRC bytes long.
 552	 * Since the driver can't differentiate a ACK/NACK response from a valid
 553	 * READ response, the CRC calculation must be handled at digital level
 554	 * even if the driver supports it for this technology.
 555	 */
 556	if (resp->len == DIGITAL_MIFARE_READ_RES_LEN + DIGITAL_CRC_LEN) {
 557		if (digital_skb_check_crc_a(resp)) {
 558			PROTOCOL_ERR("9.4.1.2");
 559			return -EIO;
 560		}
 561
 562		return 0;
 563	}
 564
 565	/* ACK response (i.e. successful WRITE). */
 566	if (resp->len == 1 && resp->data[0] == DIGITAL_MIFARE_ACK_RES) {
 567		resp->data[0] = 0;
 568		return 0;
 569	}
 570
 571	/* NACK and any other responses are treated as error. */
 572	return -EIO;
 573}
 574
 575static void digital_in_recv_attrib_res(struct nfc_digital_dev *ddev, void *arg,
 576				       struct sk_buff *resp)
 577{
 578	struct nfc_target *target = arg;
 579	struct digital_attrib_res *attrib_res;
 580	int rc;
 581
 582	if (IS_ERR(resp)) {
 583		rc = PTR_ERR(resp);
 584		resp = NULL;
 585		goto exit;
 586	}
 587
 588	if (resp->len < sizeof(*attrib_res)) {
 589		PROTOCOL_ERR("12.6.2");
 590		rc = -EIO;
 591		goto exit;
 592	}
 593
 594	attrib_res = (struct digital_attrib_res *)resp->data;
 595
 596	if (attrib_res->mbli_did & 0x0f) {
 597		PROTOCOL_ERR("12.6.2.1");
 598		rc = -EIO;
 599		goto exit;
 600	}
 601
 602	rc = digital_target_found(ddev, target, NFC_PROTO_ISO14443_B);
 603
 604exit:
 605	dev_kfree_skb(resp);
 606	kfree(target);
 607
 608	if (rc)
 609		digital_poll_next_tech(ddev);
 610}
 611
 612static int digital_in_send_attrib_req(struct nfc_digital_dev *ddev,
 613			       struct nfc_target *target,
 614			       struct digital_sensb_res *sensb_res)
 615{
 616	struct digital_attrib_req *attrib_req;
 617	struct sk_buff *skb;
 618	int rc;
 619
 620	skb = digital_skb_alloc(ddev, sizeof(*attrib_req));
 621	if (!skb)
 622		return -ENOMEM;
 623
 624	attrib_req = skb_put(skb, sizeof(*attrib_req));
 625
 626	attrib_req->cmd = DIGITAL_CMD_ATTRIB_REQ;
 627	memcpy(attrib_req->nfcid0, sensb_res->nfcid0,
 628	       sizeof(attrib_req->nfcid0));
 629	attrib_req->param1 = DIGITAL_ATTRIB_P1_TR0_DEFAULT |
 630			     DIGITAL_ATTRIB_P1_TR1_DEFAULT;
 631	attrib_req->param2 = DIGITAL_ATTRIB_P2_LISTEN_POLL_1 |
 632			     DIGITAL_ATTRIB_P2_POLL_LISTEN_1 |
 633			     DIGITAL_ATTRIB_P2_MAX_FRAME_256;
 634	attrib_req->param3 = sensb_res->proto_info[1] & 0x07;
 635	attrib_req->param4 = DIGITAL_ATTRIB_P4_DID(0);
 636
 637	rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_attrib_res,
 638				 target);
 639	if (rc)
 640		kfree_skb(skb);
 641
 642	return rc;
 643}
 644
 645static void digital_in_recv_sensb_res(struct nfc_digital_dev *ddev, void *arg,
 646				      struct sk_buff *resp)
 647{
 648	struct nfc_target *target = NULL;
 649	struct digital_sensb_res *sensb_res;
 650	u8 fsci;
 651	int rc;
 652
 653	if (IS_ERR(resp)) {
 654		rc = PTR_ERR(resp);
 655		resp = NULL;
 656		goto exit;
 657	}
 658
 659	if (resp->len != sizeof(*sensb_res)) {
 660		PROTOCOL_ERR("5.6.2.1");
 661		rc = -EIO;
 662		goto exit;
 663	}
 664
 665	sensb_res = (struct digital_sensb_res *)resp->data;
 666
 667	if (sensb_res->cmd != DIGITAL_CMD_SENSB_RES) {
 668		PROTOCOL_ERR("5.6.2");
 669		rc = -EIO;
 670		goto exit;
 671	}
 672
 673	if (!(sensb_res->proto_info[1] & BIT(0))) {
 674		PROTOCOL_ERR("5.6.2.12");
 675		rc = -EIO;
 676		goto exit;
 677	}
 678
 679	if (sensb_res->proto_info[1] & BIT(3)) {
 680		PROTOCOL_ERR("5.6.2.16");
 681		rc = -EIO;
 682		goto exit;
 683	}
 684
 685	fsci = DIGITAL_SENSB_FSCI(sensb_res->proto_info[1]);
 686	if (fsci >= 8)
 687		ddev->target_fsc = DIGITAL_ATS_MAX_FSC;
 688	else
 689		ddev->target_fsc = digital_ats_fsc[fsci];
 690
 691	target = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
 692	if (!target) {
 693		rc = -ENOMEM;
 694		goto exit;
 695	}
 696
 697	rc = digital_in_send_attrib_req(ddev, target, sensb_res);
 698
 699exit:
 700	dev_kfree_skb(resp);
 701
 702	if (rc) {
 703		kfree(target);
 704		digital_poll_next_tech(ddev);
 705	}
 706}
 707
 708int digital_in_send_sensb_req(struct nfc_digital_dev *ddev, u8 rf_tech)
 709{
 710	struct digital_sensb_req *sensb_req;
 711	struct sk_buff *skb;
 712	int rc;
 713
 714	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
 715				     NFC_DIGITAL_RF_TECH_106B);
 716	if (rc)
 717		return rc;
 718
 719	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
 720				     NFC_DIGITAL_FRAMING_NFCB);
 721	if (rc)
 722		return rc;
 723
 724	skb = digital_skb_alloc(ddev, sizeof(*sensb_req));
 725	if (!skb)
 726		return -ENOMEM;
 727
 728	sensb_req = skb_put(skb, sizeof(*sensb_req));
 729
 730	sensb_req->cmd = DIGITAL_CMD_SENSB_REQ;
 731	sensb_req->afi = 0x00; /* All families and sub-families */
 732	sensb_req->param = DIGITAL_SENSB_N(0);
 733
 734	rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sensb_res,
 735				 NULL);
 736	if (rc)
 737		kfree_skb(skb);
 738
 739	return rc;
 740}
 741
 742static void digital_in_recv_sensf_res(struct nfc_digital_dev *ddev, void *arg,
 743				   struct sk_buff *resp)
 744{
 745	int rc;
 746	u8 proto;
 747	struct nfc_target target;
 748	struct digital_sensf_res *sensf_res;
 749
 750	if (IS_ERR(resp)) {
 751		rc = PTR_ERR(resp);
 752		resp = NULL;
 753		goto exit;
 754	}
 755
 756	if (resp->len < DIGITAL_SENSF_RES_MIN_LENGTH) {
 757		rc = -EIO;
 758		goto exit;
 759	}
 760
 761	if (!DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
 762		rc = digital_skb_check_crc_f(resp);
 763		if (rc) {
 764			PROTOCOL_ERR("6.4.1.8");
 765			goto exit;
 766		}
 767	}
 768
 769	skb_pull(resp, 1);
 770
 771	memset(&target, 0, sizeof(struct nfc_target));
 772
 773	sensf_res = (struct digital_sensf_res *)resp->data;
 774
 775	memcpy(target.sensf_res, sensf_res, resp->len);
 776	target.sensf_res_len = resp->len;
 777
 778	memcpy(target.nfcid2, sensf_res->nfcid2, NFC_NFCID2_MAXSIZE);
 779	target.nfcid2_len = NFC_NFCID2_MAXSIZE;
 780
 781	if (target.nfcid2[0] == DIGITAL_SENSF_NFCID2_NFC_DEP_B1 &&
 782	    target.nfcid2[1] == DIGITAL_SENSF_NFCID2_NFC_DEP_B2)
 783		proto = NFC_PROTO_NFC_DEP;
 784	else
 785		proto = NFC_PROTO_FELICA;
 786
 787	rc = digital_target_found(ddev, &target, proto);
 788
 789exit:
 790	dev_kfree_skb(resp);
 791
 792	if (rc)
 793		digital_poll_next_tech(ddev);
 794}
 795
 796int digital_in_send_sensf_req(struct nfc_digital_dev *ddev, u8 rf_tech)
 797{
 798	struct digital_sensf_req *sensf_req;
 799	struct sk_buff *skb;
 800	int rc;
 801	u8 size;
 802
 803	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
 804	if (rc)
 805		return rc;
 806
 807	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
 808				     NFC_DIGITAL_FRAMING_NFCF);
 809	if (rc)
 810		return rc;
 811
 812	size = sizeof(struct digital_sensf_req);
 813
 814	skb = digital_skb_alloc(ddev, size);
 815	if (!skb)
 816		return -ENOMEM;
 817
 818	skb_put(skb, size);
 819
 820	sensf_req = (struct digital_sensf_req *)skb->data;
 821	sensf_req->cmd = DIGITAL_CMD_SENSF_REQ;
 822	sensf_req->sc1 = 0xFF;
 823	sensf_req->sc2 = 0xFF;
 824	sensf_req->rc = 0;
 825	sensf_req->tsn = 0;
 826
 827	*(u8 *)skb_push(skb, 1) = size + 1;
 828
 829	if (!DIGITAL_DRV_CAPS_IN_CRC(ddev))
 830		digital_skb_add_crc_f(skb);
 831
 832	rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sensf_res,
 833				 NULL);
 834	if (rc)
 835		kfree_skb(skb);
 836
 837	return rc;
 838}
 839
 840static void digital_in_recv_iso15693_inv_res(struct nfc_digital_dev *ddev,
 841		void *arg, struct sk_buff *resp)
 842{
 843	struct digital_iso15693_inv_res *res;
 844	struct nfc_target *target = NULL;
 845	int rc;
 846
 847	if (IS_ERR(resp)) {
 848		rc = PTR_ERR(resp);
 849		resp = NULL;
 850		goto out_free_skb;
 851	}
 852
 853	if (resp->len != sizeof(*res)) {
 854		rc = -EIO;
 855		goto out_free_skb;
 856	}
 857
 858	res = (struct digital_iso15693_inv_res *)resp->data;
 859
 860	if (!DIGITAL_ISO15693_RES_IS_VALID(res->flags)) {
 861		PROTOCOL_ERR("ISO15693 - 10.3.1");
 862		rc = -EINVAL;
 863		goto out_free_skb;
 864	}
 865
 866	target = kzalloc(sizeof(*target), GFP_KERNEL);
 867	if (!target) {
 868		rc = -ENOMEM;
 869		goto out_free_skb;
 870	}
 871
 872	target->is_iso15693 = 1;
 873	target->iso15693_dsfid = res->dsfid;
 874	memcpy(target->iso15693_uid, &res->uid, sizeof(target->iso15693_uid));
 875
 876	rc = digital_target_found(ddev, target, NFC_PROTO_ISO15693);
 877
 878	kfree(target);
 879
 880out_free_skb:
 881	dev_kfree_skb(resp);
 882
 883	if (rc)
 884		digital_poll_next_tech(ddev);
 885}
 886
 887int digital_in_send_iso15693_inv_req(struct nfc_digital_dev *ddev, u8 rf_tech)
 888{
 889	struct digital_iso15693_inv_req *req;
 890	struct sk_buff *skb;
 891	int rc;
 892
 893	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
 894				     NFC_DIGITAL_RF_TECH_ISO15693);
 895	if (rc)
 896		return rc;
 897
 898	rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
 899				     NFC_DIGITAL_FRAMING_ISO15693_INVENTORY);
 900	if (rc)
 901		return rc;
 902
 903	skb = digital_skb_alloc(ddev, sizeof(*req));
 904	if (!skb)
 905		return -ENOMEM;
 906
 907	skb_put(skb, sizeof(*req) - sizeof(req->mask)); /* No mask */
 908	req = (struct digital_iso15693_inv_req *)skb->data;
 909
 910	/* Single sub-carrier, high data rate, no AFI, single slot
 911	 * Inventory command
 912	 */
 913	req->flags = DIGITAL_ISO15693_REQ_FLAG_DATA_RATE |
 914		     DIGITAL_ISO15693_REQ_FLAG_INVENTORY |
 915		     DIGITAL_ISO15693_REQ_FLAG_NB_SLOTS;
 916	req->cmd = DIGITAL_CMD_ISO15693_INVENTORY_REQ;
 917	req->mask_len = 0;
 918
 919	rc = digital_in_send_cmd(ddev, skb, 30,
 920				 digital_in_recv_iso15693_inv_res, NULL);
 921	if (rc)
 922		kfree_skb(skb);
 923
 924	return rc;
 925}
 926
 927static int digital_tg_send_sel_res(struct nfc_digital_dev *ddev)
 928{
 929	struct sk_buff *skb;
 930	int rc;
 931
 932	skb = digital_skb_alloc(ddev, 1);
 933	if (!skb)
 934		return -ENOMEM;
 935
 936	skb_put_u8(skb, DIGITAL_SEL_RES_NFC_DEP);
 937
 938	if (!DIGITAL_DRV_CAPS_TG_CRC(ddev))
 939		digital_skb_add_crc_a(skb);
 940
 941	rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
 942				     NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE);
 943	if (rc) {
 944		kfree_skb(skb);
 945		return rc;
 946	}
 947
 948	rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_atr_req,
 949				 NULL);
 950	if (rc)
 951		kfree_skb(skb);
 952
 953	return rc;
 954}
 955
 956static void digital_tg_recv_sel_req(struct nfc_digital_dev *ddev, void *arg,
 957				    struct sk_buff *resp)
 958{
 959	int rc;
 960
 961	if (IS_ERR(resp)) {
 962		rc = PTR_ERR(resp);
 963		resp = NULL;
 964		goto exit;
 965	}
 966
 967	if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) {
 968		rc = digital_skb_check_crc_a(resp);
 969		if (rc) {
 970			PROTOCOL_ERR("4.4.1.3");
 971			goto exit;
 972		}
 973	}
 974
 975	/* Silently ignore SEL_REQ content and send a SEL_RES for NFC-DEP */
 976
 977	rc = digital_tg_send_sel_res(ddev);
 978
 979exit:
 980	if (rc)
 981		digital_poll_next_tech(ddev);
 982
 983	dev_kfree_skb(resp);
 984}
 985
 986static int digital_tg_send_sdd_res(struct nfc_digital_dev *ddev)
 987{
 988	struct sk_buff *skb;
 989	struct digital_sdd_res *sdd_res;
 990	int rc, i;
 991
 992	skb = digital_skb_alloc(ddev, sizeof(struct digital_sdd_res));
 993	if (!skb)
 994		return -ENOMEM;
 995
 996	skb_put(skb, sizeof(struct digital_sdd_res));
 997	sdd_res = (struct digital_sdd_res *)skb->data;
 998
 999	sdd_res->nfcid1[0] = 0x08;
1000	get_random_bytes(sdd_res->nfcid1 + 1, 3);
1001
1002	sdd_res->bcc = 0;
1003	for (i = 0; i < 4; i++)
1004		sdd_res->bcc ^= sdd_res->nfcid1[i];
1005
1006	rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1007				NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A);
1008	if (rc) {
1009		kfree_skb(skb);
1010		return rc;
1011	}
1012
1013	rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_sel_req,
1014				 NULL);
1015	if (rc)
1016		kfree_skb(skb);
1017
1018	return rc;
1019}
1020
1021static void digital_tg_recv_sdd_req(struct nfc_digital_dev *ddev, void *arg,
1022				    struct sk_buff *resp)
1023{
1024	u8 *sdd_req;
1025	int rc;
1026
1027	if (IS_ERR(resp)) {
1028		rc = PTR_ERR(resp);
1029		resp = NULL;
1030		goto exit;
1031	}
1032
1033	sdd_req = resp->data;
1034
1035	if (resp->len < 2 || sdd_req[0] != DIGITAL_CMD_SEL_REQ_CL1 ||
1036	    sdd_req[1] != DIGITAL_SDD_REQ_SEL_PAR) {
1037		rc = -EINVAL;
1038		goto exit;
1039	}
1040
1041	rc = digital_tg_send_sdd_res(ddev);
1042
1043exit:
1044	if (rc)
1045		digital_poll_next_tech(ddev);
1046
1047	dev_kfree_skb(resp);
1048}
1049
1050static int digital_tg_send_sens_res(struct nfc_digital_dev *ddev)
1051{
1052	struct sk_buff *skb;
1053	u8 *sens_res;
1054	int rc;
1055
1056	skb = digital_skb_alloc(ddev, 2);
1057	if (!skb)
1058		return -ENOMEM;
1059
1060	sens_res = skb_put(skb, 2);
1061
1062	sens_res[0] = (DIGITAL_SENS_RES_NFC_DEP >> 8) & 0xFF;
1063	sens_res[1] = DIGITAL_SENS_RES_NFC_DEP & 0xFF;
1064
1065	rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1066				     NFC_DIGITAL_FRAMING_NFCA_STANDARD);
1067	if (rc) {
1068		kfree_skb(skb);
1069		return rc;
1070	}
1071
1072	rc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_sdd_req,
1073				 NULL);
1074	if (rc)
1075		kfree_skb(skb);
1076
1077	return rc;
1078}
1079
1080void digital_tg_recv_sens_req(struct nfc_digital_dev *ddev, void *arg,
1081			      struct sk_buff *resp)
1082{
1083	u8 sens_req;
1084	int rc;
1085
1086	if (IS_ERR(resp)) {
1087		rc = PTR_ERR(resp);
1088		resp = NULL;
1089		goto exit;
1090	}
1091
1092	sens_req = resp->data[0];
1093
1094	if (!resp->len || (sens_req != DIGITAL_CMD_SENS_REQ &&
1095	    sens_req != DIGITAL_CMD_ALL_REQ)) {
1096		rc = -EINVAL;
1097		goto exit;
1098	}
1099
1100	rc = digital_tg_send_sens_res(ddev);
1101
1102exit:
1103	if (rc)
1104		digital_poll_next_tech(ddev);
1105
1106	dev_kfree_skb(resp);
1107}
1108
1109static void digital_tg_recv_atr_or_sensf_req(struct nfc_digital_dev *ddev,
1110		void *arg, struct sk_buff *resp)
1111{
1112	if (!IS_ERR(resp) && (resp->len >= 2) &&
1113			(resp->data[1] == DIGITAL_CMD_SENSF_REQ))
1114		digital_tg_recv_sensf_req(ddev, arg, resp);
1115	else
1116		digital_tg_recv_atr_req(ddev, arg, resp);
1117
1118	return;
1119}
1120
1121static int digital_tg_send_sensf_res(struct nfc_digital_dev *ddev,
1122			      struct digital_sensf_req *sensf_req)
1123{
1124	struct sk_buff *skb;
1125	u8 size;
1126	int rc;
1127	struct digital_sensf_res *sensf_res;
1128
1129	size = sizeof(struct digital_sensf_res);
1130
1131	if (sensf_req->rc == DIGITAL_SENSF_REQ_RC_NONE)
1132		size -= sizeof(sensf_res->rd);
1133
1134	skb = digital_skb_alloc(ddev, size);
1135	if (!skb)
1136		return -ENOMEM;
1137
1138	skb_put(skb, size);
1139
1140	sensf_res = (struct digital_sensf_res *)skb->data;
1141
1142	memset(sensf_res, 0, size);
1143
1144	sensf_res->cmd = DIGITAL_CMD_SENSF_RES;
1145	sensf_res->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
1146	sensf_res->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
1147	get_random_bytes(&sensf_res->nfcid2[2], 6);
1148
1149	switch (sensf_req->rc) {
1150	case DIGITAL_SENSF_REQ_RC_SC:
1151		sensf_res->rd[0] = sensf_req->sc1;
1152		sensf_res->rd[1] = sensf_req->sc2;
1153		break;
1154	case DIGITAL_SENSF_REQ_RC_AP:
1155		sensf_res->rd[0] = DIGITAL_SENSF_RES_RD_AP_B1;
1156		sensf_res->rd[1] = DIGITAL_SENSF_RES_RD_AP_B2;
1157		break;
1158	}
1159
1160	*(u8 *)skb_push(skb, sizeof(u8)) = size + 1;
1161
1162	if (!DIGITAL_DRV_CAPS_TG_CRC(ddev))
1163		digital_skb_add_crc_f(skb);
1164
1165	rc = digital_tg_send_cmd(ddev, skb, 300,
1166				 digital_tg_recv_atr_or_sensf_req, NULL);
1167	if (rc)
1168		kfree_skb(skb);
1169
1170	return rc;
1171}
1172
1173void digital_tg_recv_sensf_req(struct nfc_digital_dev *ddev, void *arg,
1174			       struct sk_buff *resp)
1175{
1176	struct digital_sensf_req *sensf_req;
1177	int rc;
1178
1179	if (IS_ERR(resp)) {
1180		rc = PTR_ERR(resp);
1181		resp = NULL;
1182		goto exit;
1183	}
1184
1185	if (!DIGITAL_DRV_CAPS_TG_CRC(ddev)) {
1186		rc = digital_skb_check_crc_f(resp);
1187		if (rc) {
1188			PROTOCOL_ERR("6.4.1.8");
1189			goto exit;
1190		}
1191	}
1192
1193	if (resp->len != sizeof(struct digital_sensf_req) + 1) {
1194		rc = -EINVAL;
1195		goto exit;
1196	}
1197
1198	skb_pull(resp, 1);
1199	sensf_req = (struct digital_sensf_req *)resp->data;
1200
1201	if (sensf_req->cmd != DIGITAL_CMD_SENSF_REQ) {
1202		rc = -EINVAL;
1203		goto exit;
1204	}
1205
1206	rc = digital_tg_send_sensf_res(ddev, sensf_req);
1207
1208exit:
1209	if (rc)
1210		digital_poll_next_tech(ddev);
1211
1212	dev_kfree_skb(resp);
1213}
1214
1215static int digital_tg_config_nfca(struct nfc_digital_dev *ddev)
1216{
1217	int rc;
1218
1219	rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
1220				     NFC_DIGITAL_RF_TECH_106A);
1221	if (rc)
1222		return rc;
1223
1224	return digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1225				       NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);
1226}
1227
1228int digital_tg_listen_nfca(struct nfc_digital_dev *ddev, u8 rf_tech)
1229{
1230	int rc;
1231
1232	rc = digital_tg_config_nfca(ddev);
1233	if (rc)
1234		return rc;
1235
1236	return digital_tg_listen(ddev, 300, digital_tg_recv_sens_req, NULL);
1237}
1238
1239static int digital_tg_config_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech)
1240{
1241	int rc;
1242
1243	rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
1244	if (rc)
1245		return rc;
1246
1247	return digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1248				       NFC_DIGITAL_FRAMING_NFCF_NFC_DEP);
1249}
1250
1251int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech)
1252{
1253	int rc;
1254
1255	rc = digital_tg_config_nfcf(ddev, rf_tech);
1256	if (rc)
1257		return rc;
1258
1259	return digital_tg_listen(ddev, 300, digital_tg_recv_sensf_req, NULL);
1260}
1261
1262void digital_tg_recv_md_req(struct nfc_digital_dev *ddev, void *arg,
1263			    struct sk_buff *resp)
1264{
1265	u8 rf_tech;
1266	int rc;
1267
1268	if (IS_ERR(resp)) {
1269		resp = NULL;
1270		goto exit_free_skb;
1271	}
1272
1273	rc = ddev->ops->tg_get_rf_tech(ddev, &rf_tech);
1274	if (rc)
1275		goto exit_free_skb;
1276
1277	switch (rf_tech) {
1278	case NFC_DIGITAL_RF_TECH_106A:
1279		rc = digital_tg_config_nfca(ddev);
1280		if (rc)
1281			goto exit_free_skb;
1282		digital_tg_recv_sens_req(ddev, arg, resp);
1283		break;
1284	case NFC_DIGITAL_RF_TECH_212F:
1285	case NFC_DIGITAL_RF_TECH_424F:
1286		rc = digital_tg_config_nfcf(ddev, rf_tech);
1287		if (rc)
1288			goto exit_free_skb;
1289		digital_tg_recv_sensf_req(ddev, arg, resp);
1290		break;
1291	default:
1292		goto exit_free_skb;
1293	}
1294
1295	return;
1296
1297exit_free_skb:
1298	digital_poll_next_tech(ddev);
1299	dev_kfree_skb(resp);
1300}