Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
[wrt350n-kernel.git] / include / asm-cris / etraxi2c.h
blobe369a7620893230a51894d9aa503fc1c82f00e81
1 /* $Id: etraxi2c.h,v 1.1 2001/01/18 15:49:57 bjornw Exp $ */
3 #ifndef _LINUX_ETRAXI2C_H
4 #define _LINUX_ETRAXI2C_H
6 /* etraxi2c _IOC_TYPE, bits 8 to 15 in ioctl cmd */
8 #define ETRAXI2C_IOCTYPE 44
10 /* supported ioctl _IOC_NR's */
12 /* in write operations, the argument contains both i2c
13 * slave, register and value.
16 #define I2C_WRITEARG(slave, reg, value) (((slave) << 16) | ((reg) << 8) | (value))
17 #define I2C_READARG(slave, reg) (((slave) << 16) | ((reg) << 8))
19 #define I2C_ARGSLAVE(arg) ((arg) >> 16)
20 #define I2C_ARGREG(arg) (((arg) >> 8) & 0xff)
21 #define I2C_ARGVALUE(arg) ((arg) & 0xff)
23 #define I2C_WRITEREG 0x1 /* write to an i2c register */
24 #define I2C_READREG 0x2 /* read from an i2c register */
27 EXAMPLE usage:
29 i2c_arg = I2C_WRITEARG(STA013_WRITE_ADDR, reg, val);
30 ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_WRITEREG), i2c_arg);
32 i2c_arg = I2C_READARG(STA013_READ_ADDR, reg);
33 val = ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_READREG), i2c_arg);
36 #endif