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 */ 61