| /* $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 |
