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#ifndef _LINUX_ETRAXI2C_H
#define _LINUX_ETRAXI2C_H
 
/* etraxi2c _IOC_TYPE, bits 8 to 15 in ioctl cmd */
 
#define ETRAXI2C_IOCTYPE 44
 
/* supported ioctl _IOC_NR's */
 
/* in write operations, the argument contains both i2c
 * slave, register and value.
 */
 
#define I2C_WRITEARG(slave, reg, value) (((slave) << 16) | ((reg) << 8) | (value))
#define I2C_READARG(slave, reg) (((slave) << 16) | ((reg) << 8))
 
#define I2C_ARGSLAVE(arg) ((arg) >> 16)
#define I2C_ARGREG(arg) (((arg) >> 8) & 0xff)
#define I2C_ARGVALUE(arg) ((arg) & 0xff)
 
#define I2C_WRITEREG 0x1   /* write to an i2c register */
#define I2C_READREG  0x2   /* read from an i2c register */
 
/*
EXAMPLE usage:
 
    i2c_arg = I2C_WRITEARG(STA013_WRITE_ADDR, reg, val);
    ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_WRITEREG), i2c_arg);
 
    i2c_arg = I2C_READARG(STA013_READ_ADDR, reg);
    val = ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_READREG), i2c_arg);
 
*/
#endif