path: root/net/nfc/digital_technology.c

/*
 * NFC Digital Protocol stack
 * Copyright (c) 2013, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */

#define pr_fmt(fmt) "digital: %s: " fmt, __func__

#include "digital.h"

#define DIGITAL_CMD_SENS_REQ    0x26
#define DIGITAL_CMD_ALL_REQ     0x52
#define DIGITAL_CMD_SEL_REQ_CL1 0x93
#define DIGITAL_CMD_SEL_REQ_CL2 0x95
#define DIGITAL_CMD_SEL_REQ_CL3 0x97

#define DIGITAL_SDD_REQ_SEL_PAR 0x20

#define DIGITAL_SDD_RES_CT  0x88
#define DIGITAL_SDD_RES_LEN 5

#define DIGITAL_SEL_RES_NFCID1_COMPLETE(sel_res) (!((sel_res) & 0x04))
#define DIGITAL_SEL_RES_IS_T2T(sel_res) (!((sel_res) & 0x60))
#define DIGITAL_SEL_RES_IS_T4T(sel_res) ((sel_res) & 0x20)
#define DIGITAL_SEL_RES_IS_NFC_DEP(sel_res) ((sel_res) & 0x40)

#define DIGITAL_SENS_RES_IS_T1T(sens_res) (((sens_res) & 0x0C00) == 0x0C00)
#define DIGITAL_SENS_RES_IS_VALID(sens_res) \
	((!((sens_res) & 0x001F) && (((sens_res) & 0x0C00) == 0x0C00)) || \
	(((sens_res) & 0x001F) && ((sens_res) & 0x0C00) != 0x0C00))

#define DIGITAL_MIFARE_READ_RES_LEN 16
#define DIGITAL_MIFARE_ACK_RES	0x0A

#define DIGITAL_CMD_SENSB_REQ			0x05
#define DIGITAL_SENSB_ADVANCED			BIT(5)
#define DIGITAL_SENSB_EXTENDED			BIT(4)
#define DIGITAL_SENSB_ALLB_REQ			BIT(3)
#define DIGITAL_SENSB_N(n)			((n) & 0x7)

#define DIGITAL_CMD_SENSB_RES			0x50

#define DIGITAL_CMD_ATTRIB_REQ			0x1D
#define DIGITAL_ATTRIB_P1_TR0_DEFAULT		(0x0 << 6)
#define DIGITAL_ATTRIB_P1_TR1_DEFAULT		(0x0 << 4)
#define DIGITAL_ATTRIB_P1_SUPRESS_EOS		BIT(3)
#define DIGITAL_ATTRIB_P1_SUPRESS_SOS		BIT(2)
#define DIGITAL_ATTRIB_P2_LISTEN_POLL_1		(0x0 << 6)
#define DIGITAL_ATTRIB_P2_POLL_LISTEN_1		(0x0 << 4)
#define DIGITAL_ATTRIB_P2_MAX_FRAME_256		0x8
#define DIGITAL_ATTRIB_P4_DID(n)		((n) & 0xf)

#define DIGITAL_CMD_SENSF_REQ	0x00
#define DIGITAL_CMD_SENSF_RES	0x01

#define DIGITAL_SENSF_RES_MIN_LENGTH 17
#define DIGITAL_SENSF_RES_RD_AP_B1   0x00
#define DIGITAL_SENSF_RES_RD_AP_B2   0x8F

#define DIGITAL_SENSF_REQ_RC_NONE 0
#define DIGITAL_SENSF_REQ_RC_SC   1
#define DIGITAL_SENSF_REQ_RC_AP   2

#define DIGITAL_CMD_ISO15693_INVENTORY_REQ	0x01

#define DIGITAL_ISO15693_REQ_FLAG_DATA_RATE	BIT(1)
#define DIGITAL_ISO15693_REQ_FLAG_INVENTORY	BIT(2)
#define DIGITAL_ISO15693_REQ_FLAG_NB_SLOTS	BIT(5)
#define DIGITAL_ISO15693_RES_FLAG_ERROR		BIT(0)
#define DIGITAL_ISO15693_RES_IS_VALID(flags) \
	(!((flags) & DIGITAL_ISO15693_RES_FLAG_ERROR))

#define DIGITAL_ISO_DEP_I_PCB	 0x02
#define DIGITAL_ISO_DEP_PNI(pni) ((pni) & 0x01)

#define DIGITAL_ISO_DEP_PCB_TYPE(pcb) ((pcb) & 0xC0)

#define DIGITAL_ISO_DEP_I_BLOCK 0x00

#define DIGITAL_ISO_DEP_BLOCK_HAS_DID(pcb) ((pcb) & 0x08)

static const u8 digital_ats_fsc[] = {
	 16,  24,  32,  40,  48,  64,  96, 128,
};

#define DIGITAL_ATS_FSCI(t0) ((t0) & 0x0F)
#define DIGITAL_SENSB_FSCI(pi2) (((pi2) & 0xF0) >> 4)
#define DIGITAL_ATS_MAX_FSC  256

#define DIGITAL_RATS_BYTE1 0xE0
#define DIGITAL_RATS_PARAM 0x80

struct digital_sdd_res {
	u8 nfcid1[4];
	u8 bcc;
} __packed;

struct digital_sel_req {
	u8 sel_cmd;
	u8 b2;
	u8 nfcid1[4];
	u8 bcc;
} __packed;

struct digital_sensb_req {
	u8 cmd;
	u8 afi;
	u8 param;
} __packed;

struct digital_sensb_res {
	u8 cmd;
	u8 nfcid0[4];
	u8 app_data[4];
	u8 proto_info[3];
} __packed;

struct digital_attrib_req {
	u8 cmd;
	u8 nfcid0[4];
	u8 param1;
	u8 param2;
	u8 param3;
	u8 param4;
} __packed;

struct digital_attrib_res {
	u8 mbli_did;
} __packed;

struct digital_sensf_req {
	u8 cmd;
	u8 sc1;
	u8 sc2;
	u8 rc;
	u8 tsn;
} __packed;

struct digital_sensf_res {
	u8 cmd;
	u8 nfcid2[8];
	u8 pad0[2];
	u8 pad1[3];
	u8 mrti_check;
	u8 mrti_update;
	u8 pad2;
	u8 rd[2];
} __packed;

struct digital_iso15693_inv_req {
	u8 flags;
	u8 cmd;
	u8 mask_len;
	u64 mask;
} __packed;

struct digital_iso15693_inv_res {
	u8 flags;
	u8 dsfid;
	u64 uid;
} __packed;

static int digital_in_send_sdd_req