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The C and C++ Include Header Files

cat -n /usr/include/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 _LINUX_I2C_DEV_H
    10	#define _LINUX_I2C_DEV_H
    11	
    12	#include <linux/types.h>
    13	
    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 *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 *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 /* _LINUX_I2C_DEV_H */