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Add header file missed from a previous commit.
Add header file missed from a previous commit.
git-svn-id: http://lm-sensors.org/svn/i2c-tools/trunk@6053 7894878c-1315-0410-8ee3-d5d059ff63e0tags/v4.0
Jean Delvare
13 years ago
1 changed files with 212 additions and 0 deletions
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/* |
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smbus.h - SMBus level access helper functions |
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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., 51 Franklin Street, Fifth Floor, Boston, |
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MA 02110-1301 USA. |
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*/ |
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#ifndef LIB_I2C_SMBUS_H |
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#define LIB_I2C_SMBUS_H |
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#include <sys/ioctl.h> |
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#include <linux/types.h> |
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#include <linux/i2c.h> |
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#include <linux/i2c-dev.h> |
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/* Compatibility defines */ |
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#ifndef I2C_SMBUS_I2C_BLOCK_BROKEN |
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#define I2C_SMBUS_I2C_BLOCK_BROKEN I2C_SMBUS_I2C_BLOCK_DATA |
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#endif |
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#ifndef I2C_FUNC_SMBUS_PEC |
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#define I2C_FUNC_SMBUS_PEC I2C_FUNC_SMBUS_HWPEC_CALC |
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#endif |
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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, const __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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/* Returns the number of read bytes */ |
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/* Until kernel 2.6.22, the length is hardcoded to 32 bytes. If you |
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ask for less than 32 bytes, your code will only work with kernels |
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2.6.23 and later. */ |
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static inline __s32 i2c_smbus_read_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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data.block[0] = length; |
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if (i2c_smbus_access(file, I2C_SMBUS_READ, command, |
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length == 32 ? I2C_SMBUS_I2C_BLOCK_BROKEN : |
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I2C_SMBUS_I2C_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_i2c_block_data(int file, __u8 command, |
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__u8 length, |
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const __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_BROKEN, &data); |
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} |
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/* Returns the number of read bytes */ |
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static inline __s32 i2c_smbus_block_process_call(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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if (i2c_smbus_access(file, I2C_SMBUS_WRITE, command, |
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I2C_SMBUS_BLOCK_PROC_CALL, &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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#endif /* LIB_I2C_SMBUS_H */ |
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