etraxi2c.h
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上传日期:2013-02-24
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- /* $Id: etraxi2c.h,v 1.1 2001/01/18 15:49:57 bjornw Exp $ */
- #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