include/uapi/linux/i2c-dev.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /*
   3     i2c-dev.h - i2c-bus driver, char device interface
   4
   5     Copyright (C) 1995-97 Simon G. Vogl
   6     Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  21     MA 02110-1301 USA.
  22 */
  23
  24 #ifndef _UAPI_LINUX_I2C_DEV_H
  25 #define _UAPI_LINUX_I2C_DEV_H
  26
  27 #include <linux/types.h>
  28 #include <linux/compiler.h>
  29
  30 /* /dev/i2c-X ioctl commands.  The ioctl's parameter is always an
  31  * unsigned long, except for:
  32  *      - I2C_FUNCS, takes pointer to an unsigned long
  33  *      - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data
  34  *      - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data
  35  */
  36 #define I2C_RETRIES     0x0701  /* number of times a device address should
  37                                    be polled when not acknowledging */
  38 #define I2C_TIMEOUT     0x0702  /* set timeout in units of 10 ms */
  39
  40 /* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses
  41  * are NOT supported! (due to code brokenness)
  42  */
  43 #define I2C_SLAVE       0x0703  /* Use this slave address */
  44 #define I2C_SLAVE_FORCE 0x0706  /* Use this slave address, even if it
  45                                    is already in use by a driver! */
  46 #define I2C_TENBIT      0x0704  /* 0 for 7 bit addrs, != 0 for 10 bit */
  47
  48 #define I2C_FUNCS       0x0705  /* Get the adapter functionality mask */
  49
  50 #define I2C_RDWR        0x0707  /* Combined R/W transfer (one STOP only) */
  51
  52 #define I2C_PEC         0x0708  /* != 0 to use PEC with SMBus */
  53 #define I2C_SMBUS       0x0720  /* SMBus transfer */
  54
  55
  56 /* This is the structure as used in the I2C_SMBUS ioctl call */
  57 struct i2c_smbus_ioctl_data {
  58         __u8 read_write;
  59         __u8 command;
  60         __u32 size;
  61         union i2c_smbus_data __user *data;
  62 };
  63
  64 /* This is the structure as used in the I2C_RDWR ioctl call */
  65 struct i2c_rdwr_ioctl_data {
  66         struct i2c_msg __user *msgs;    /* pointers to i2c_msgs */
  67         __u32 nmsgs;                    /* number of i2c_msgs */
  68 };
  69
  70 #define  I2C_RDWR_IOCTL_MAX_MSGS        42
  71 /* Originally defined with a typo, keep it for compatibility */
  72 #define  I2C_RDRW_IOCTL_MAX_MSGS        I2C_RDWR_IOCTL_MAX_MSGS
  73
  74
  75 #endif /* _UAPI_LINUX_I2C_DEV_H */