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1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */2/*3 * i2c-dev.h - I2C bus char device interface4 *5 * Copyright (C) 1995-97 Simon G. Vogl6 * Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>7 */8 9#ifndef _UAPI_LINUX_I2C_DEV_H10#define _UAPI_LINUX_I2C_DEV_H11 12#include <linux/types.h>13#include <linux/compiler.h>14 15/* /dev/i2c-X ioctl commands. The ioctl's parameter is always an16 * unsigned long, except for:17 * - I2C_FUNCS, takes pointer to an unsigned long18 * - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data19 * - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data20 */21#define I2C_RETRIES 0x0701 /* number of times a device address should22 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 addresses26 * 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 it30 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 */42struct 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 */50struct 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 4256/* Originally defined with a typo, keep it for compatibility */57#define I2C_RDRW_IOCTL_MAX_MSGS I2C_RDWR_IOCTL_MAX_MSGS58 59 60#endif /* _UAPI_LINUX_I2C_DEV_H */61