include/linux/i2c-dev.h

   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., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #ifndef _LINUX_I2C_DEV_H
  23 #define _LINUX_I2C_DEV_H
  24
  25 #include <linux/types.h>
  26 #include <linux/compiler.h>
  27
  28 /* /dev/i2c-X ioctl commands.  The ioctl's parameter is always an
  29  * unsigned long, except for:
  30  *      - I2C_FUNCS, takes pointer to an unsigned long
  31  *      - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data
  32  *      - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data
  33  */
  34 #define I2C_RETRIES     0x0701  /* number of times a device address should
  35                                    be polled when not acknowledging */
  36 #define I2C_TIMEOUT     0x0702  /* set timeout in units of 10 ms */
  37
  38 /* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses
  39  * are NOT supported! (due to code brokenness)
  40  */
  41 #define I2C_SLAVE       0x0703  /* Use this slave address */
  42 #define I2C_SLAVE_FORCE 0x0706  /* Use this slave address, even if it
  43                                    is already in use by a driver! */
  44 #define I2C_TENBIT      0x0704  /* 0 for 7 bit addrs, != 0 for 10 bit */
  45
  46 #define I2C_FUNCS       0x0705  /* Get the adapter functionality mask */
  47
  48 #define I2C_RDWR        0x0707  /* Combined R/W transfer (one STOP only) */
  49
  50 #define I2C_PEC         0x0708  /* != 0 to use PEC with SMBus */
  51 #define I2C_SMBUS       0x0720  /* SMBus transfer */
  52
  53
  54 /* This is the structure as used in the I2C_SMBUS ioctl call */
  55 struct i2c_smbus_ioctl_data {
  56         __u8 read_write;
  57         __u8 command;
  58         __u32 size;
  59         union i2c_smbus_data __user *data;
  60 };
  61
  62 /* This is the structure as used in the I2C_RDWR ioctl call */
  63 struct i2c_rdwr_ioctl_data {
  64         struct i2c_msg __user *msgs;    /* pointers to i2c_msgs */
  65         __u32 nmsgs;                    /* number of i2c_msgs */
  66 };
  67
  68 #define  I2C_RDRW_IOCTL_MAX_MSGS        42
  69
  70 #ifdef __KERNEL__
  71 #define I2C_MAJOR       89              /* Device major number          */
  72 #endif
  73
  74 #endif /* _LINUX_I2C_DEV_H */