/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ /* i2c-dev.h - i2c-bus driver, char device interface Copyright (C) 1995-97 Simon G. Vogl Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef _LINUX_I2C_DEV_H #define _LINUX_I2C_DEV_H #include <linux/types.h> /* /dev/i2c-X ioctl commands. The ioctl's parameter is always an * unsigned long, except for: * - I2C_FUNCS, takes pointer to an unsigned long * - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data * - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data */ #define I2C_RETRIES 0x0701 /* number of times a device address should be polled when not acknowledging */ #define I2C_TIMEOUT 0x0702 /* set timeout in units of 10 ms */ /* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses * are NOT supported! (due to code brokenness) */ #define I2C_SLAVE 0x0703 /* Use this slave address */ #define I2C_SLAVE_FORCE 0x0706 /* Use this slave address, even if it is already in use by a driver! */ #define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */ #define I2C_FUNCS 0x0705 /* Get the adapter functionality mask */ #define I2C_RDWR 0x0707 /* Combined R/W transfer (one STOP only) */ #define I2C_PEC 0x0708 /* != 0 to use PEC with SMBus */ #define I2C_SMBUS 0x0720 /* SMBus transfer */ /* This is the structure as used in the I2C_SMBUS ioctl call */ struct i2c_smbus_ioctl_data { __u8 read_write; __u8 command; __u32 size; union i2c_smbus_data *data; }; /* This is the structure as used in the I2C_RDWR ioctl call */ struct i2c_rdwr_ioctl_data { struct i2c_msg *msgs; /* pointers to i2c_msgs */ __u32 nmsgs; /* number of i2c_msgs */ }; #define I2C_RDWR_IOCTL_MAX_MSGS 42 /* Originally defined with a typo, keep it for compatibility */ #define I2C_RDRW_IOCTL_MAX_MSGS I2C_RDWR_IOCTL_MAX_MSGS #endif /* _LINUX_I2C_DEV_H */