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 */
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	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 */
61