linux/include/linux/i2c-dev.h
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   1/*
   2    i2c-dev.h - i2c-bus driver, char device interface
   3
   4    Copyright (C) 1995-97 Simon G. Vogl
   5    Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  20    MA 02110-1301 USA.
  21*/
  22
  23#ifndef _LINUX_I2C_DEV_H
  24#define _LINUX_I2C_DEV_H
  25
  26#include <linux/types.h>
  27#include <linux/compiler.h>
  28
  29/* /dev/i2c-X ioctl commands.  The ioctl's parameter is always an
  30 * unsigned long, except for:
  31 *      - I2C_FUNCS, takes pointer to an unsigned long
  32 *      - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data
  33 *      - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data
  34 */
  35#define I2C_RETRIES     0x0701  /* number of times a device address should
  36                                   be polled when not acknowledging */
  37#define I2C_TIMEOUT     0x0702  /* set timeout in units of 10 ms */
  38
  39/* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses
  40 * are NOT supported! (due to code brokenness)
  41 */
  42#define I2C_SLAVE       0x0703  /* Use this slave address */
  43#define I2C_SLAVE_FORCE 0x0706  /* Use this slave address, even if it
  44                                   is already in use by a driver! */
  45#define I2C_TENBIT      0x0704  /* 0 for 7 bit addrs, != 0 for 10 bit */
  46
  47#define I2C_FUNCS       0x0705  /* Get the adapter functionality mask */
  48
  49#define I2C_RDWR        0x0707  /* Combined R/W transfer (one STOP only) */
  50
  51#define I2C_PEC         0x0708  /* != 0 to use PEC with SMBus */
  52#define I2C_SMBUS       0x0720  /* SMBus transfer */
  53
  54
  55/* This is the structure as used in the I2C_SMBUS ioctl call */
  56struct i2c_smbus_ioctl_data {
  57        __u8 read_write;
  58        __u8 command;
  59        __u32 size;
  60        union i2c_smbus_data __user *data;
  61};
  62
  63/* This is the structure as used in the I2C_RDWR ioctl call */
  64struct i2c_rdwr_ioctl_data {
  65        struct i2c_msg __user *msgs;    /* pointers to i2c_msgs */
  66        __u32 nmsgs;                    /* number of i2c_msgs */
  67};
  68
  69#define  I2C_RDRW_IOCTL_MAX_MSGS        42
  70
  71#ifdef __KERNEL__
  72#define I2C_MAJOR       89              /* Device major number          */
  73#endif
  74
  75#endif /* _LINUX_I2C_DEV_H */
  76
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