61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
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/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* i2c-dev.h - I2C bus char device interface
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*
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* Copyright (C) 1995-97 Simon G. Vogl
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* Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
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*/
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#ifndef _LINUX_I2C_DEV_H
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#define _LINUX_I2C_DEV_H
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#include <linux/types.h>
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/* /dev/i2c-X ioctl commands. The ioctl's parameter is always an
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* unsigned long, except for:
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* - I2C_FUNCS, takes pointer to an unsigned long
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* - I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data
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* - I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data
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*/
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#define I2C_RETRIES 0x0701 /* number of times a device address should
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be polled when not acknowledging */
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#define I2C_TIMEOUT 0x0702 /* set timeout in units of 10 ms */
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/* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses
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* are NOT supported! (due to code brokenness)
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*/
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#define I2C_SLAVE 0x0703 /* Use this slave address */
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#define I2C_SLAVE_FORCE 0x0706 /* Use this slave address, even if it
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is already in use by a driver! */
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#define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */
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#define I2C_FUNCS 0x0705 /* Get the adapter functionality mask */
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#define I2C_RDWR 0x0707 /* Combined R/W transfer (one STOP only) */
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#define I2C_PEC 0x0708 /* != 0 to use PEC with SMBus */
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#define I2C_SMBUS 0x0720 /* SMBus transfer */
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/* This is the structure as used in the I2C_SMBUS ioctl call */
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struct i2c_smbus_ioctl_data {
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__u8 read_write;
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__u8 command;
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__u32 size;
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union i2c_smbus_data *data;
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};
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/* This is the structure as used in the I2C_RDWR ioctl call */
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struct i2c_rdwr_ioctl_data {
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struct i2c_msg *msgs; /* pointers to i2c_msgs */
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__u32 nmsgs; /* number of i2c_msgs */
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};
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#define I2C_RDWR_IOCTL_MAX_MSGS 42
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/* Originally defined with a typo, keep it for compatibility */
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#define I2C_RDRW_IOCTL_MAX_MSGS I2C_RDWR_IOCTL_MAX_MSGS
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#endif /* _LINUX_I2C_DEV_H */
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