[linux-2.6-block.git] / include / linux / can.h

/*
 * linux/can.h
 *
 * Definitions for CAN network layer (socket addr / CAN frame / CAN filter)
 *
 * Authors: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
 *          Urs Thuermann   <urs.thuermann@volkswagen.de>
 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
 * All rights reserved.
 *
 * Send feedback to <socketcan-users@lists.berlios.de>
 *
 */

#ifndef CAN_H
#define CAN_H

#include <linux/types.h>
#include <linux/socket.h>

/* controller area network (CAN) kernel definitions */

/* special address description flags for the CAN_ID */
#define CAN_EFF_FLAG 0x80000000U /* EFF/SFF is set in the MSB */
#define CAN_RTR_FLAG 0x40000000U /* remote transmission request */
#define CAN_ERR_FLAG 0x20000000U /* error frame */

/* valid bits in CAN ID for frame formats */
#define CAN_SFF_MASK 0x000007FFU /* standard frame format (SFF) */
#define CAN_EFF_MASK 0x1FFFFFFFU /* extended frame format (EFF) */
#define CAN_ERR_MASK 0x1FFFFFFFU /* omit EFF, RTR, ERR flags */

/*
 * Controller Area Network Identifier structure
 *
 * bit 0-28	: CAN identifier (11/29 bit)
 * bit 29	: error frame flag (0 = data frame, 1 = error frame)
 * bit 30	: remote transmission request flag (1 = rtr frame)
 * bit 31	: frame format flag (0 = standard 11 bit, 1 = extended 29 bit)
 */
typedef __u32 canid_t;

/*
 * Controller Area Network Error Frame Mask structure
 *
 * bit 0-28	: error class mask (see include/linux/can/error.h)
 * bit 29-31	: set to zero
 */
typedef __u32 can_err_mask_t;

/**
 * struct can_frame - basic CAN frame structure
 * @can_id:  the CAN ID of the frame and CAN_*_FLAG flags, see above.
 * @can_dlc: the data length field of the CAN frame
 * @data:    the CAN frame payload.
 */
struct can_frame {
	canid_t can_id;  /* 32 bit CAN_ID + EFF/RTR/ERR flags */
	__u8    can_dlc; /* data length code: 0 .. 8 */
	__u8    data[8] __attribute__((aligned(8)));
};

/* particular protocols of the protocol family PF_CAN */
#define CAN_RAW		1 /* RAW sockets */
#define CAN_BCM		2 /* Broadcast Manager */
#define CAN_TP16	3 /* VAG Transport Protocol v1.6 */
#define CAN_TP20	4 /* VAG Transport Protocol v2.0 */
#define CAN_MCNET	5 /* Bosch MCNet */
#define CAN_ISOTP	6 /* ISO 15765-2 Transport Protocol */
#define CAN_NPROTO	7

#define SOL_CAN_BASE 100

/**
 * struct sockaddr_can - the sockaddr structure for CAN sockets
 * @can_family:  address family number AF_CAN.
 * @can_ifindex: CAN network interface index.
 * @can_addr:    protocol specific address information
 */
struct sockaddr_can {
	sa_family_t can_family;
	int         can_ifindex;
	union {
		/* transport protocol class address information (e.g. ISOTP) */
		struct { canid_t rx_id, tx_id; } tp;

		/* reserved for future CAN protocols address information */
	} can_addr;
};

/**
 * struct can_filter - CAN ID based filter in can_register().
 * @can_id:   relevant bits of CAN ID which are not masked out.
 * @can_mask: CAN mask (see description)
 *
 * Description:
 * A filter matches, when
 *
 *          <received_can_id> & mask == can_id & mask
 *
 * The filter can be inverted (CAN_INV_FILTER bit set in can_id) or it can
 * filter for error frames (CAN_ERR_FLAG bit set in mask).
 */
struct can_filter {
	canid_t can_id;
	canid_t can_mask;
};

#define CAN_INV_FILTER 0x20000000U /* to be set in can_filter.can_id */

#endif /* CAN_H */
Commit	Line	Data
0d66548a OH	1	/*
	2	* linux/can.h
	3	*
	4	* Definitions for CAN network layer (socket addr / CAN frame / CAN filter)
	5	*
	6	* Authors: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
	7	* Urs Thuermann <urs.thuermann@volkswagen.de>
	8	* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
	9	* All rights reserved.
	10	*
	11	* Send feedback to <socketcan-users@lists.berlios.de>
	12	*
	13	*/
	14
	15	#ifndef CAN_H
	16	#define CAN_H
	17
	18	#include <linux/types.h>
	19	#include <linux/socket.h>
	20
	21	/* controller area network (CAN) kernel definitions */
	22
	23	/* special address description flags for the CAN_ID */
	24	#define CAN_EFF_FLAG 0x80000000U /* EFF/SFF is set in the MSB */
	25	#define CAN_RTR_FLAG 0x40000000U /* remote transmission request */
	26	#define CAN_ERR_FLAG 0x20000000U /* error frame */
	27
	28	/* valid bits in CAN ID for frame formats */
	29	#define CAN_SFF_MASK 0x000007FFU /* standard frame format (SFF) */
	30	#define CAN_EFF_MASK 0x1FFFFFFFU /* extended frame format (EFF) */
	31	#define CAN_ERR_MASK 0x1FFFFFFFU /* omit EFF, RTR, ERR flags */
	32
	33	/*
	34	* Controller Area Network Identifier structure
	35	*
	36	* bit 0-28 : CAN identifier (11/29 bit)
	37	* bit 29 : error frame flag (0 = data frame, 1 = error frame)
	38	* bit 30 : remote transmission request flag (1 = rtr frame)
	39	* bit 31 : frame format flag (0 = standard 11 bit, 1 = extended 29 bit)
	40	*/
	41	typedef __u32 canid_t;
	42
	43	/*
	44	* Controller Area Network Error Frame Mask structure
	45	*
	46	* bit 0-28 : error class mask (see include/linux/can/error.h)
	47	* bit 29-31 : set to zero
	48	*/
	49	typedef __u32 can_err_mask_t;
	50
	51	/**
	52	* struct can_frame - basic CAN frame structure
	53	* @can_id: the CAN ID of the frame and CAN_*_FLAG flags, see above.
	54	* @can_dlc: the data length field of the CAN frame
	55	* @data: the CAN frame payload.
	56	*/
	57	struct can_frame {
	58	canid_t can_id; /* 32 bit CAN_ID + EFF/RTR/ERR flags */
	59	__u8 can_dlc; /* data length code: 0 .. 8 */
	60	__u8 data[8] __attribute__((aligned(8)));
	61	};
	62
	63	/* particular protocols of the protocol family PF_CAN */
	64	#define CAN_RAW 1 /* RAW sockets */
65	#define CAN_BCM 2 /* Broadcast Manager */
66	#define CAN_TP16 3 /* VAG Transport Protocol v1.6 */
67	#define CAN_TP20 4 /* VAG Transport Protocol v2.0 */
68	#define CAN_MCNET 5 /* Bosch MCNet */
69	#define CAN_ISOTP 6 /* ISO 15765-2 Transport Protocol */
70	#define CAN_NPROTO 7
71
72	#define SOL_CAN_BASE 100
73
74	/**
75	* struct sockaddr_can - the sockaddr structure for CAN sockets
76	* @can_family: address family number AF_CAN.
77	* @can_ifindex: CAN network interface index.
78	* @can_addr: protocol specific address information
79	*/
80	struct sockaddr_can {
81	sa_family_t can_family;
82	int can_ifindex;
83	union {
84	/* transport protocol class address information (e.g. ISOTP) */
85	struct { canid_t rx_id, tx_id; } tp;
86
87	/* reserved for future CAN protocols address information */
88	} can_addr;
89	};
90
91	/**
92	* struct can_filter - CAN ID based filter in can_register().
93	* @can_id: relevant bits of CAN ID which are not masked out.
94	* @can_mask: CAN mask (see description)
95	*
96	* Description:
97	* A filter matches, when
98	*
99	* <received_can_id> & mask == can_id & mask
100	*
101	* The filter can be inverted (CAN_INV_FILTER bit set in can_id) or it can
102	* filter for error frames (CAN_ERR_FLAG bit set in mask).
103	*/
104	struct can_filter {
105	canid_t can_id;
106	canid_t can_mask;
107	};
108
109	#define CAN_INV_FILTER 0x20000000U /* to be set in can_filter.can_id */
110
111	#endif /* CAN_H */