arch/cris/include/asm/etraxi2c.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* $Id: etraxi2c.h,v 1.1 2001/01/18 15:49:57 bjornw Exp $ */
   3
   4 #ifndef _LINUX_ETRAXI2C_H
   5 #define _LINUX_ETRAXI2C_H
   6
   7 /* etraxi2c _IOC_TYPE, bits 8 to 15 in ioctl cmd */
   8
   9 #define ETRAXI2C_IOCTYPE 44
  10
  11 /* supported ioctl _IOC_NR's */
  12
  13 /* in write operations, the argument contains both i2c
  14  * slave, register and value.
  15  */
  16
  17 #define I2C_WRITEARG(slave, reg, value) (((slave) << 16) | ((reg) << 8) | (value))
  18 #define I2C_READARG(slave, reg) (((slave) << 16) | ((reg) << 8))
  19
  20 #define I2C_ARGSLAVE(arg) ((arg) >> 16)
  21 #define I2C_ARGREG(arg) (((arg) >> 8) & 0xff)
  22 #define I2C_ARGVALUE(arg) ((arg) & 0xff)
  23
  24 #define I2C_WRITEREG 0x1   /* write to an i2c register */
  25 #define I2C_READREG  0x2   /* read from an i2c register */
  26
  27 /*
  28 EXAMPLE usage:
  29
  30     i2c_arg = I2C_WRITEARG(STA013_WRITE_ADDR, reg, val);
  31     ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_WRITEREG), i2c_arg);
  32
  33     i2c_arg = I2C_READARG(STA013_READ_ADDR, reg);
  34     val = ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_READREG), i2c_arg);
  35
  36 */
  37 #endif