1/* $Id: etraxi2c.h,v 1.1 2001/01/18 15:49:57 bjornw Exp $ */ 2 3#ifndef _LINUX_ETRAXI2C_H 4#define _LINUX_ETRAXI2C_H 5 6/* etraxi2c _IOC_TYPE, bits 8 to 15 in ioctl cmd */ 7 8#define ETRAXI2C_IOCTYPE 44 9 10/* supported ioctl _IOC_NR's */ 11 12/* in write operations, the argument contains both i2c 13 * slave, register and value. 14 */ 15 16#define I2C_WRITEARG(slave, reg, value) (((slave) << 16) | ((reg) << 8) | (value)) 17#define I2C_READARG(slave, reg) (((slave) << 16) | ((reg) << 8)) 18 19#define I2C_ARGSLAVE(arg) ((arg) >> 16) 20#define I2C_ARGREG(arg) (((arg) >> 8) & 0xff) 21#define I2C_ARGVALUE(arg) ((arg) & 0xff) 22 23#define I2C_WRITEREG 0x1 /* write to an i2c register */ 24#define I2C_READREG 0x2 /* read from an i2c register */ 25 26/* 27EXAMPLE usage: 28 29 i2c_arg = I2C_WRITEARG(STA013_WRITE_ADDR, reg, val); 30 ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_WRITEREG), i2c_arg); 31 32 i2c_arg = I2C_READARG(STA013_READ_ADDR, reg); 33 val = ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_READREG), i2c_arg); 34 35*/ 36#endif 37