1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ 2 /* 3 i2c-dev.h - i2c-bus driver, char device interface 4 5 Copyright (C) 1995-97 Simon G. Vogl 6 Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 21 MA 02110-1301 USA. 22 */ 23 24 #ifndef _UAPI_LINUX_I2C_DEV_H 25 #define _UAPI_LINUX_I2C_DEV_H 26 27 #include <linux/types.h> 28 #include <linux/compiler.h> 29 30 /* /dev/i2c-X ioctl commands. The ioctl's parameter is always an 31 * unsigned long, except for: 32 * - I2C_FUNCS, takes pointer to an unsigned long 33 * - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data 34 * - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data 35 */ 36 #define I2C_RETRIES 0x0701 /* number of times a device address should 37 be polled when not acknowledging */ 38 #define I2C_TIMEOUT 0x0702 /* set timeout in units of 10 ms */ 39 40 /* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses 41 * are NOT supported! (due to code brokenness) 42 */ 43 #define I2C_SLAVE 0x0703 /* Use this slave address */ 44 #define I2C_SLAVE_FORCE 0x0706 /* Use this slave address, even if it 45 is already in use by a driver! */ 46 #define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */ 47 48 #define I2C_FUNCS 0x0705 /* Get the adapter functionality mask */ 49 50 #define I2C_RDWR 0x0707 /* Combined R/W transfer (one STOP only) */ 51 52 #define I2C_PEC 0x0708 /* != 0 to use PEC with SMBus */ 53 #define I2C_SMBUS 0x0720 /* SMBus transfer */ 54 55 56 /* This is the structure as used in the I2C_SMBUS ioctl call */ 57 struct i2c_smbus_ioctl_data { 58 __u8 read_write; 59 __u8 command; 60 __u32 size; 61 union i2c_smbus_data __user *data; 62 }; 63 64 /* This is the structure as used in the I2C_RDWR ioctl call */ 65 struct i2c_rdwr_ioctl_data { 66 struct i2c_msg __user *msgs; /* pointers to i2c_msgs */ 67 __u32 nmsgs; /* number of i2c_msgs */ 68 }; 69 70 #define I2C_RDWR_IOCTL_MAX_MSGS 42 71 /* Originally defined with a typo, keep it for compatibility */ 72 #define I2C_RDRW_IOCTL_MAX_MSGS I2C_RDWR_IOCTL_MAX_MSGS 73 74 75 #endif /* _UAPI_LINUX_I2C_DEV_H */ 76