182 lines
4.9 KiB
C
182 lines
4.9 KiB
C
/*
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i2c-dev.h - i2c-bus driver, char device interface
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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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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* $Id: i2c-dev.h,v 1.9 2001/08/15 03:04:58 mds Exp $ */
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#ifndef I2C_DEV_H
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#define I2C_DEV_H
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#include <linux/types.h>
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#include <linux/i2c.h>
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/* Some IOCTL commands are defined in <linux/i2c.h> */
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/* Note: 10-bit addresses are NOT supported! */
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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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#ifndef __KERNEL__
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#include <sys/ioctl.h>
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static inline __s32 i2c_smbus_access(int file, char read_write, __u8 command,
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int size, union i2c_smbus_data *data)
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{
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struct i2c_smbus_ioctl_data args;
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args.read_write = read_write;
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args.command = command;
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args.size = size;
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args.data = data;
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return ioctl(file,I2C_SMBUS,&args);
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}
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static inline __s32 i2c_smbus_write_quick(int file, __u8 value)
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{
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return i2c_smbus_access(file,value,0,I2C_SMBUS_QUICK,NULL);
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}
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static inline __s32 i2c_smbus_read_byte(int file)
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{
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union i2c_smbus_data data;
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if (i2c_smbus_access(file,I2C_SMBUS_READ,0,I2C_SMBUS_BYTE,&data))
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return -1;
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else
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return 0x0FF & data.byte;
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}
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static inline __s32 i2c_smbus_write_byte(int file, __u8 value)
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{
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return i2c_smbus_access(file,I2C_SMBUS_WRITE,value,
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I2C_SMBUS_BYTE,NULL);
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}
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static inline __s32 i2c_smbus_read_byte_data(int file, __u8 command)
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{
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union i2c_smbus_data data;
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if (i2c_smbus_access(file,I2C_SMBUS_READ,command,
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I2C_SMBUS_BYTE_DATA,&data))
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return -1;
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else
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return 0x0FF & data.byte;
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}
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static inline __s32 i2c_smbus_write_byte_data(int file, __u8 command,
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__u8 value)
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{
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union i2c_smbus_data data;
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data.byte = value;
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return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,
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I2C_SMBUS_BYTE_DATA, &data);
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}
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static inline __s32 i2c_smbus_read_word_data(int file, __u8 command)
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{
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union i2c_smbus_data data;
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if (i2c_smbus_access(file,I2C_SMBUS_READ,command,
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I2C_SMBUS_WORD_DATA,&data))
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return -1;
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else
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return 0x0FFFF & data.word;
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}
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static inline __s32 i2c_smbus_write_word_data(int file, __u8 command,
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__u16 value)
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{
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union i2c_smbus_data data;
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data.word = value;
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return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,
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I2C_SMBUS_WORD_DATA, &data);
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}
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static inline __s32 i2c_smbus_process_call(int file, __u8 command, __u16 value)
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{
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union i2c_smbus_data data;
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data.word = value;
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if (i2c_smbus_access(file,I2C_SMBUS_WRITE,command,
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I2C_SMBUS_PROC_CALL,&data))
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return -1;
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else
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return 0x0FFFF & data.word;
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}
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/* Returns the number of read bytes */
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static inline __s32 i2c_smbus_read_block_data(int file, __u8 command,
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__u8 *values)
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{
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union i2c_smbus_data data;
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int i;
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if (i2c_smbus_access(file,I2C_SMBUS_READ,command,
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I2C_SMBUS_BLOCK_DATA,&data))
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return -1;
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else {
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for (i = 1; i <= data.block[0]; i++)
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values[i-1] = data.block[i];
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return data.block[0];
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}
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}
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static inline __s32 i2c_smbus_write_block_data(int file, __u8 command,
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__u8 length, __u8 *values)
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{
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union i2c_smbus_data data;
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int i;
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if (length > 32)
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length = 32;
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for (i = 1; i <= length; i++)
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data.block[i] = values[i-1];
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data.block[0] = length;
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return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,
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I2C_SMBUS_BLOCK_DATA, &data);
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}
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static inline __s32 i2c_smbus_write_i2c_block_data(int file, __u8 command,
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__u8 length, __u8 *values)
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{
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union i2c_smbus_data data;
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int i;
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if (length > 32)
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length = 32;
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for (i = 1; i <= length; i++)
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data.block[i] = values[i-1];
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data.block[0] = length;
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return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,
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I2C_SMBUS_I2C_BLOCK_DATA, &data);
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}
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#endif /* ndef __KERNEL__ */
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#endif
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