/* SIMtrace2 USB protocol
 *
 * (C) 2015-2017 by Harald Welte <hwelte@hmw-consulting.de>
 * (C) 2018 by sysmocom -s.f.m.c. GmbH, Author: Kevin Redon <kredon@sysmocom.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that 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.
 */
#pragma once

#include <stdint.h>
#include <stdbool.h>

/***********************************************************************
 * COMMON HEADER
 ***********************************************************************/

enum simtrace_msg_class {
	SIMTRACE_MSGC_GENERIC = 0,
	/* Card Emulation / Forwarding */
	SIMTRACE_MSGC_CARDEM,
	/* Modem Control (if modem is attached next to device) */
	SIMTRACE_MSGC_MODEM,
	/* Reader/phone-car/SIM communication sniff */
	SIMTRACE_MSGC_SNIFF,

	/* first vendor-specific request */
	_SIMTRACE_MGSC_VENDOR_FIRST = 127,
};

enum simtrace_msg_type_generic {
	/* Generic Error Message */
	SIMTRACE_CMD_DO_ERROR	= 0,
	/* Request/Response for simtrace_board_info */
	SIMTRACE_CMD_BD_BOARD_INFO,
};

/* SIMTRACE_MSGC_CARDEM */
enum simtrace_msg_type_cardem {
	/* TPDU Data to be transmitted to phone */
	SIMTRACE_MSGT_DT_CEMU_TX_DATA = 1,
	/* Set the ATR to be returned at phone-SIM reset */
	SIMTRACE_MSGT_DT_CEMU_SET_ATR,
	/* Get Statistics Request / Response */
	SIMTRACE_MSGT_BD_CEMU_STATS,
	/* Get Status Request / Response */
	SIMTRACE_MSGT_BD_CEMU_STATUS,
	/* Request / Confirm emulated card insert */
	SIMTRACE_MSGT_DT_CEMU_CARDINSERT,
	/* TPDU Data received from phomne */
	SIMTRACE_MSGT_DO_CEMU_RX_DATA,
	/* Indicate PTS request from phone */
	SIMTRACE_MSGT_DO_CEMU_PTS,
	/* Set configurable parameters */
	SIMTRACE_MSGT_BD_CEMU_CONFIG,
};

/* SIMTRACE_MSGC_MODEM */
enum simtrace_msg_type_modem {
	/* Modem Control: Reset an attached modem */
	SIMTRACE_MSGT_DT_MODEM_RESET = 1,
	/* Modem Control: Select local / remote SIM */
	SIMTRACE_MSGT_DT_MODEM_SIM_SELECT,
	/* Modem Control: Status (WWAN LED, SIM Presence) */
	SIMTRACE_MSGT_BD_MODEM_STATUS,
};

/* SIMTRACE_MSGC_SNIFF */
enum simtrace_msg_type_sniff {
	/* Status change (card inserted, reset, ...) */
	SIMTRACE_MSGT_SNIFF_CHANGE = 0,
	/* Fi/Di baudrate change */
	SIMTRACE_MSGT_SNIFF_FIDI,
	/* ATR data */
	SIMTRACE_MSGT_SNIFF_ATR,
	/* PPS (request or response) data */
	SIMTRACE_MSGT_SNIFF_PPS,
	/* TPDU data */
	SIMTRACE_MSGT_SNIFF_TPDU,
};

/* common message header */
struct simtrace_msg_hdr {
	uint8_t msg_class;	/* simtrace_msg_class */
	uint8_t msg_type;	/* simtrace_msg_type_xxx */
	uint8_t seq_nr;
	uint8_t slot_nr;	/* SIM slot number */
	uint16_t _reserved;
	uint16_t msg_len;	/* length including header */
	uint8_t payload[0];
} __attribute__ ((packed));

/***********************************************************************
 * Capabilities
 ***********************************************************************/

/* generic capabilities */
enum simtrace_capability_generic {
	/* compatible with 5V SIM card interface */
	SIMTRACE_CAP_VOLT_5V,
	/* compatible with 3.3V SIM card interface */
	SIMTRACE_CAP_VOLT_3V3,
	/* compatible with 1.8V SIM card interface */
	SIMTRACE_CAP_VOLT_1V8,
	/* Has LED1 */
	SIMTRACE_CAP_LED_1,
	/* Has LED2 */
	SIMTRACE_CAP_LED_2,
	/* Has Single-Pole Dual-Throw (local/remote SIM) */
	SIMTRACE_CAP_SPDT,
	/* Has Bus-Switch (trace / MITM) */
	SIMTRACE_CAP_BUS_SWITCH,
	/* Can read VSIM via ADC */
	SIMTRACE_CAP_VSIM_ADC,
	/* Can read temperature via ADC */
	SIMTRACE_CAP_TEMP_ADC,
	/* Supports DFU for firmware update */
	SIMTRACE_CAP_DFU,
	/* Supports Ctrl EP command for erasing flash / return to SAM-BA */
	SIMTRACE_CAP_ERASE_FLASH,
	/* Can read the status of card insert contact */
	SIMTRACE_CAP_READ_CARD_DET,
	/* Can control the status of a simulated card insert */
	SIMTRACE_CAP_ASSERT_CARD_DET,
	/* Can toggle the hardware reset of an attached modem */
	SIMTRACE_CAP_ASSERT_MODEM_RST,
};

/* vendor-specific capabilities of sysmocom devices */
enum simtrace_capability_vendor {
	/* Can erase a peer SAM3 controller */
	SIMTRACE_CAP_SYSMO_QMOD_ERASE_PEER,
	/* Can read/write an attached EEPROM */
	SIMTRACE_CAP_SYSMO_QMOD_RW_EEPROM,
	/* can reset an attached USB hub */
	SIMTRACE_CAP_SYSMO_QMOD_RESET_HUB,
};

/* SIMTRACE_CMD_BD_BOARD_INFO */
struct simtrace_board_info {
	struct {
		char manufacturer[32];
		char model[32];
		char version[32];
	} hardware;
	struct {
		/* who provided this software? */
		char provider[32];
		/* name of software image */
		char name[32];
		/* (git) version at build time */
		char version[32];
		/* built on which machine? */
		char buildhost[32];
		/* CRC-32 over software image */
		uint32_t crc;
	} software;
	struct {
		/* Maximum baud rate supported */
		uint32_t max_baud_rate;
	} speed;
	/* number of bytes of generic capability bit-mask */
	uint8_t cap_generic_bytes;
	/* number of bytes of vendor capability bit-mask */
	uint8_t cap_vendor_bytes;
	uint8_t data[0];
	/* cap_generic + cap_vendor */
} __attribute__ ((packed));

/***********************************************************************
 * CARD EMULATOR / FORWARDER
 ***********************************************************************/

/* indicates a TPDU header is present in this message */
#define CEMU_DATA_F_TPDU_HDR	0x00000001
/* indicates last part of transmission in this direction */
#define CEMU_DATA_F_FINAL	0x00000002
/* incdicates a PB is present and we should continue with TX */
#define CEMU_DATA_F_PB_AND_TX	0x00000004
/* incdicates a PB is present and we should continue with RX */
#define CEMU_DATA_F_PB_AND_RX	0x00000008

/* CEMU_USB_MSGT_DT_CARDINSERT */
struct cardemu_usb_msg_cardinsert {
	uint8_t card_insert;
} __attribute__ ((packed));

/* CEMU_USB_MSGT_DT_SET_ATR */
struct cardemu_usb_msg_set_atr {
	uint8_t atr_len;
	/* variable-length ATR data */
	uint8_t atr[0];
} __attribute__ ((packed));

/* CEMU_USB_MSGT_DT_TX_DATA */
struct cardemu_usb_msg_tx_data {
	uint32_t flags;
	uint16_t data_len;
	/* variable-length TPDU data */
	uint8_t data[0];
} __attribute__ ((packed));

/* CEMU_USB_MSGT_DO_RX_DATA */
struct cardemu_usb_msg_rx_data {
	uint32_t flags;
	uint16_t data_len;
	/* variable-length TPDU data */
	uint8_t data[0];
} __attribute__ ((packed));

#define CEMU_STATUS_F_VCC_PRESENT	0x00000001
#define CEMU_STATUS_F_CLK_ACTIVE	0x00000002
#define CEMU_STATUS_F_RCEMU_ACTIVE	0x00000004
#define CEMU_STATUS_F_CARD_INSERT	0x00000008
#define CEMU_STATUS_F_RESET_ACTIVE	0x00000010

/* CEMU_USB_MSGT_DO_STATUS */
struct cardemu_usb_msg_status {
	uint32_t flags;
	/* phone-applied target voltage in mV */
	uint16_t voltage_mv;
	/* F/D related information. Not actual Fn/Dn values but indexes into tables! */
	union {
		uint8_t F_index;	/* <! Index to ISO7816-3 Table 7 (F and f_max values) */
		uint8_t fi;		/* <! old, wrong name for API compatibility */
	};
	union {
		uint8_t D_index;	/* <! Index to ISO7816-3 Table 8 (D value) */
		uint8_t di;		/* <! old, wrong name for API compatibility */
	};
	uint8_t wi;		/* <! Waiting Integer as defined in ISO7816-3 Section 10.2 */
	uint32_t waiting_time;	/* <! Waiting Time in etu as defined in ISO7816-3 Section 8.1 */
} __attribute__ ((packed));

/* CEMU_USB_MSGT_DO_PTS */
struct cardemu_usb_msg_pts_info {
	uint8_t pts_len;
	/* PTS request as sent from reader */
	uint8_t req[6];
	/* PTS response as sent by card */
	uint8_t resp[6];
} __attribute__ ((packed));

/* CEMU_USB_MSGT_DO_ERROR */
struct cardemu_usb_msg_error {
	uint8_t severity;
	uint8_t subsystem;
	uint16_t code;
	uint8_t msg_len;
	/* human-readable error message */
	uint8_t msg[0];
} __attribute__ ((packed));

/* enable/disable the generation of DO_STATUS on IRQ endpoint */
#define CEMU_FEAT_F_STATUS_IRQ	0x00000001

/* SIMTRACE_MSGT_BD_CEMU_CONFIG */
struct cardemu_usb_msg_config {
	/* bit-mask of CEMU_FEAT_F flags */
	uint32_t features;
	/* the selected slot number (if an external mux is present) */
	uint8_t slot_mux_nr;
} __attribute__ ((packed));

/***********************************************************************
 * MODEM CONTROL
 ***********************************************************************/

/* SIMTRACE_MSGT_DT_MODEM_RESET */
struct st_modem_reset {
	/* 0: de-assert reset, 1: assert reset, 2: pulse reset */
	uint8_t asserted;
	/* if above is '2', duration of pulse in ms */
	uint16_t pulse_duration_msec;
} __attribute__((packed));

/* SIMTRACE_MSGT_DT_MODEM_SIM_SELECT */
struct st_modem_sim_select {
	/* remote (1), local (0) */
	uint8_t remote_sim;
} __attribute__((packed));

/* SIMTRACE_MSGT_BD_MODEM_STATUS */
#define ST_MDM_STS_BIT_WWAN_LED		(1 << 0)
#define ST_MDM_STS_BIT_CARD_INSERTED	(1 << 1)
struct st_modem_status {
	/* bit-field of supported status bits */
	uint8_t supported_mask;
	/* bit-field of current status bits */
	uint8_t status_mask;
	/* bit-field of changed status bits */
	uint8_t changed_mask;
} __attribute__((packed));

/***********************************************************************
 * SNIFF
 ***********************************************************************/

/* SIMTRACE_MSGT_SNIFF_CHANGE flags */
#define SNIFF_CHANGE_FLAG_CARD_INSERT (1<<0)
#define SNIFF_CHANGE_FLAG_CARD_EJECT (1<<1)
#define SNIFF_CHANGE_FLAG_RESET_ASSERT (1<<2)
#define SNIFF_CHANGE_FLAG_RESET_DEASSERT (1<<3)
#define SNIFF_CHANGE_FLAG_TIMEOUT_WT (1<<4)
/* SIMTRACE_MSGT_SNIFF_ATR, SIMTRACE_MSGT_SNIFF_PPS, SIMTRACE_MSGT_SNIFF_TPDU flags */
#define SNIFF_DATA_FLAG_ERROR_INCOMPLETE (1<<5)
#define SNIFF_DATA_FLAG_ERROR_MALFORMED (1<<6)
#define SNIFF_DATA_FLAG_ERROR_CHECKSUM (1<<7)
#define SNIFF_DATA_FLAG_ERROR_OVERRUN (1<<8)
#define SNIFF_DATA_FLAG_ERROR_FRAMING (1<<9)
#define SNIFF_DATA_FLAG_ERROR_PARITY (1<<10)

/* SIMTRACE_MSGT_SNIFF_CHANGE */
struct sniff_change {
	/* SIMTRACE_MSGT_SNIFF_CHANGE flags */
	uint32_t flags;
} __attribute__ ((packed));

/* SIMTRACE_MSGT_SNIFF_FIDI */
struct sniff_fidi {
	/* Fi/Di values as encoded in TA1 */
	uint8_t fidi;
} __attribute__ ((packed));

/* SIMTRACE_MSGT_SNIFF_ATR, SIMTRACE_MSGT_SNIFF_PPS, SIMTRACE_MSGT_SNIFF_TPDU */
struct sniff_data {
	/* data flags */
	uint32_t flags;
	/* data length */
	uint16_t length;
	/* data */
	uint8_t data[0];
} __attribute__ ((packed));