include/uapi/linux/i2c-dev.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /*
   3  * i2c-dev.h - I2C bus char device interface
   4  *
   5  * Copyright (C) 1995-97 Simon G. Vogl
   6  * Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
   7  */
   8
   9 #ifndef _UAPI_LINUX_I2C_DEV_H
  10 #define _UAPI_LINUX_I2C_DEV_H
  11
  12 #include <linux/types.h>
  13 #include <linux/compiler.h>
  14
  15 /* /dev/i2c-X ioctl commands.  The ioctl's parameter is always an
  16  * unsigned long, except for:
  17  *      - I2C_FUNCS, takes pointer to an unsigned long
  18  *      - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data
  19  *      - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data
  20  */
  21 #define I2C_RETRIES     0x0701  /* number of times a device address should
  22                                    be polled when not acknowledging */
  23 #define I2C_TIMEOUT     0x0702  /* set timeout in units of 10 ms */
  24
  25 /* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses
  26  * are NOT supported! (due to code brokenness)
  27  */
  28 #define I2C_SLAVE       0x0703  /* Use this slave address */
  29 #define I2C_SLAVE_FORCE 0x0706  /* Use this slave address, even if it
  30                                    is already in use by a driver! */
  31 #define I2C_TENBIT      0x0704  /* 0 for 7 bit addrs, != 0 for 10 bit */
  32
  33 #define I2C_FUNCS       0x0705  /* Get the adapter functionality mask */
  34
  35 #define I2C_RDWR        0x0707  /* Combined R/W transfer (one STOP only) */
  36
  37 #define I2C_PEC         0x0708  /* != 0 to use PEC with SMBus */
  38 #define I2C_SMBUS       0x0720  /* SMBus transfer */
  39
  40
  41 /* This is the structure as used in the I2C_SMBUS ioctl call */
  42 struct i2c_smbus_ioctl_data {
  43         __u8 read_write;
  44         __u8 command;
  45         __u32 size;
  46         union i2c_smbus_data __user *data;
  47 };
  48
  49 /* This is the structure as used in the I2C_RDWR ioctl call */
  50 struct i2c_rdwr_ioctl_data {
  51         struct i2c_msg __user *msgs;    /* pointers to i2c_msgs */
  52         __u32 nmsgs;                    /* number of i2c_msgs */
  53 };
  54
  55 #define  I2C_RDWR_IOCTL_MAX_MSGS        42
  56 /* Originally defined with a typo, keep it for compatibility */
  57 #define  I2C_RDRW_IOCTL_MAX_MSGS        I2C_RDWR_IOCTL_MAX_MSGS
  58
  59
  60 #endif /* _UAPI_LINUX_I2C_DEV_H */