include/linux/can/netlink.h

/*
 * linux/can/netlink.h
 *
 * Definitions for the CAN netlink interface
 *
 * Copyright (c) 2009 Wolfgang Grandegger <wg@grandegger.com>
 *
 * Send feedback to <socketcan-users@lists.berlios.de>
 *
 */

#ifndef CAN_NETLINK_H
#define CAN_NETLINK_H

#include <linux/types.h>

/*
 * CAN bit-timing parameters
 *
 * For futher information, please read chapter "8 BIT TIMING
 * REQUIREMENTS" of the "Bosch CAN Specification version 2.0"
 * at http://www.semiconductors.bosch.de/pdf/can2spec.pdf.
 */
struct can_bittiming {
	__u32 bitrate;		/* Bit-rate in bits/second */
	__u32 sample_point;	/* Sample point in one-tenth of a percent */
	__u32 tq;		/* Time quanta (TQ) in nanoseconds */
	__u32 prop_seg;		/* Propagation segment in TQs */
	__u32 phase_seg1;	/* Phase buffer segment 1 in TQs */
	__u32 phase_seg2;	/* Phase buffer segment 2 in TQs */
	__u32 sjw;		/* Synchronisation jump width in TQs */
	__u32 brp;		/* Bit-rate prescaler */
};

/*
 * CAN harware-dependent bit-timing constant
 *
 * Used for calculating and checking bit-timing parameters
 */
struct can_bittiming_const {
	char name[16];		/* Name of the CAN controller hardware */
	__u32 tseg1_min;	/* Time segement 1 = prop_seg + phase_seg1 */
	__u32 tseg1_max;
	__u32 tseg2_min;	/* Time segement 2 = phase_seg2 */
	__u32 tseg2_max;
	__u32 sjw_max;		/* Synchronisation jump width */
	__u32 brp_min;		/* Bit-rate prescaler */
	__u32 brp_max;
	__u32 brp_inc;
};

/*
 * CAN clock parameters
 */
struct can_clock {
	__u32 freq;		/* CAN system clock frequency in Hz */
};

/*
 * CAN operational and error states
 */
enum can_state {
	CAN_STATE_ERROR_ACTIVE = 0,	/* RX/TX error count < 96 */
	CAN_STATE_ERROR_WARNING,	/* RX/TX error count < 128 */
	CAN_STATE_ERROR_PASSIVE,	/* RX/TX error count < 256 */
	CAN_STATE_BUS_OFF,		/* RX/TX error count >= 256 */
	CAN_STATE_STOPPED,		/* Device is stopped */
	CAN_STATE_SLEEPING,		/* Device is sleeping */
	CAN_STATE_MAX
};

/*
 * CAN controller mode
 */
struct can_ctrlmode {
	__u32 mask;
	__u32 flags;
};

#define CAN_CTRLMODE_LOOPBACK	0x1	/* Loopback mode */
#define CAN_CTRLMODE_LISTENONLY	0x2 	/* Listen-only mode */
#define CAN_CTRLMODE_3_SAMPLES	0x4	/* Triple sampling mode */
#define CAN_CTRLMODE_ONE_SHOT	0x8	/* One-Shot mode */

/*
 * CAN device statistics
 */
struct can_device_stats {
	__u32 bus_error;	/* Bus errors */
	__u32 error_warning;	/* Changes to error warning state */
	__u32 error_passive;	/* Changes to error passive state */
	__u32 bus_off;		/* Changes to bus off state */
	__u32 arbitration_lost; /* Arbitration lost errors */
	__u32 restarts;		/* CAN controller re-starts */
};

/*
 * CAN netlink interface
 */
enum {
	IFLA_CAN_UNSPEC,
	IFLA_CAN_BITTIMING,
	IFLA_CAN_BITTIMING_CONST,
	IFLA_CAN_CLOCK,
	IFLA_CAN_STATE,
	IFLA_CAN_CTRLMODE,
	IFLA_CAN_RESTART_MS,
	IFLA_CAN_RESTART,
	__IFLA_CAN_MAX
};

#define IFLA_CAN_MAX	(__IFLA_CAN_MAX - 1)

#endif /* CAN_NETLINK_H */