| 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 */ |