can200.h

This version 0.2 of driver for a simple CAN bus interface． 一个CAN 总线接口程序

#ifndef CAN200_H
#define CAN200_H

#include <linux/ioctl.h>

#define DEVICE_NAME "can200"
#define DRIVER_VERSION "0.2"

#define CAN_MAJOR 60

/* Device and Driver Declarations **************************** */

#define LP_PORT 0x278
#define LP_PORT_SIZE 8
#define LP_IRQ 5

#define LP_RESET_ON  0x00
#define LP_RESET_OFF 0x04
#define LP_IRQ_ENA   0x10


/*
 * This is the CAN message
 */
typedef struct {
        unsigned char info;      /* EFF RTR 0 0 DLC.3 DLC.2 DLC.1 DLC.0 */
        unsigned char id0;
        unsigned char id1;
        unsigned char id2;       /* not present in standard frames */
        unsigned char id3;       /* not present in standard frames */
        unsigned char data[8];
        unsigned char pad;       /* pad to even address */
        unsigned short status;   /* TBD */
        unsigned long timestamp; /* jiffies at receive */
} can_msg_t;


#define CAN_INFO_EFF 0x80
#define CAN_INFO_RTR 0x40
#define CAN_INFO_LEN_MASK 0x0F

#define CAN_ID1_MASK 0xE0        /* ID20 ID19 ID18 0 0 0 0 0 */

/*--- Remote Request ---------------------------------*/
/*    Notes:	RTR is Bit 5 in TXDES1.
 */
#ifndef CAN_ID1_RTR
#define CAN_ID1_RTR 0x10
#endif

#define CAN_MSG_LEN (sizeof( can_msg_t ) )

/* CAN operating modes */
enum {CAN_RESET=-1, CAN_10K, CAN_20K, CAN_40K, CAN_50K, CAN_100K, CAN_125K };

#define SUCCESS 0


/* Set the message of the device driver */
#define IOCTL_SET_SPEED _IOR(CAN_MAJOR, 0, int)
/* _IOR means that we're creating an ioctl command
 * number for passing information from a user process
 * to the kernel module.
 *
 * The first arguments, CAN_MAJOR, is the major device
 * number we're using.
 *
 * The second argument is the number of the command
 * (there could be several with different meanings).
 *
 * The third argument is the type we want to get from
 * the process to the kernel.
 */

/* Get the n'th byte of the message */
//#define IOCTL_GET_NTH_BYTE _IOWR(CAN_MAJOR, 2, int)
 /* The IOCTL is used for both input and output. It
  * receives from the user a number, n, and returns
  * Message[n]. */


#endif