| 1 | /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ |
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| 2 | /* |
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| 3 | * i2c-dev.h - I2C bus char device interface |
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| 4 | * |
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| 5 | * Copyright (C) 1995-97 Simon G. Vogl |
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| 6 | * Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> |
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| 7 | */ |
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| 8 | |
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| 9 | #ifndef _UAPI_LINUX_I2C_DEV_H |
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| 10 | #define _UAPI_LINUX_I2C_DEV_H |
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| 11 | |
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| 12 | #include <linux/types.h> |
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| 13 | #include <linux/compiler.h> |
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| 14 | |
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| 15 | /* /dev/i2c-X ioctl commands. The ioctl's parameter is always an |
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| 16 | * unsigned long, except for: |
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| 17 | * - I2C_FUNCS, takes pointer to an unsigned long |
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| 18 | * - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data |
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| 19 | * - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data |
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| 20 | */ |
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| 21 | #define I2C_RETRIES 0x0701 /* number of times a device address should |
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| 22 | be polled when not acknowledging */ |
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| 23 | #define I2C_TIMEOUT 0x0702 /* set timeout in units of 10 ms */ |
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| 24 | |
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| 25 | /* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses |
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| 26 | * are NOT supported! (due to code brokenness) |
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| 27 | */ |
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| 28 | #define I2C_SLAVE 0x0703 /* Use this slave address */ |
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| 29 | #define I2C_SLAVE_FORCE 0x0706 /* Use this slave address, even if it |
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| 30 | is already in use by a driver! */ |
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| 31 | #define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */ |
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| 32 | |
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| 33 | #define I2C_FUNCS 0x0705 /* Get the adapter functionality mask */ |
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| 34 | |
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| 35 | #define I2C_RDWR 0x0707 /* Combined R/W transfer (one STOP only) */ |
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| 36 | |
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| 37 | #define I2C_PEC 0x0708 /* != 0 to use PEC with SMBus */ |
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| 38 | #define I2C_SMBUS 0x0720 /* SMBus transfer */ |
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| 39 | |
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| 40 | |
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| 41 | /* This is the structure as used in the I2C_SMBUS ioctl call */ |
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| 42 | struct i2c_smbus_ioctl_data { |
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| 43 | __u8 read_write; |
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| 44 | __u8 command; |
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| 45 | __u32 size; |
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| 46 | union i2c_smbus_data __user *data; |
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| 47 | }; |
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| 48 | |
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| 49 | /* This is the structure as used in the I2C_RDWR ioctl call */ |
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| 50 | struct i2c_rdwr_ioctl_data { |
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| 51 | struct i2c_msg __user *msgs; /* pointers to i2c_msgs */ |
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| 52 | __u32 nmsgs; /* number of i2c_msgs */ |
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| 53 | }; |
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| 54 | |
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| 55 | #define I2C_RDWR_IOCTL_MAX_MSGS 42 |
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| 56 | /* Originally defined with a typo, keep it for compatibility */ |
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| 57 | #define I2C_RDRW_IOCTL_MAX_MSGS I2C_RDWR_IOCTL_MAX_MSGS |
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| 58 | |
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| 59 | |
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| 60 | #endif /* _UAPI_LINUX_I2C_DEV_H */ |
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| 61 | |
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