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