linux/include/asm-cris/etraxi2c.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

37 lines
980 B
C

/* $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