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i2c-tools-r6053-Add-smbus-header.patch
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File i2c-tools-r6053-Add-smbus-header.patch of Package python-smbus
From dbabf68c5b04a85b6fb457c539f304a84cd62eef Mon Sep 17 00:00:00 2001 From: Jean Delvare <khali@linux-fr.org> Date: Mon, 21 May 2012 16:46:51 +0000 Subject: [PATCH] Add header file missed from a previous commit. git-svn-id: http://lm-sensors.org/svn/i2c-tools/trunk@6053 7894878c-1315-0410-8ee3-d5d059ff63e0 --- include/i2c/smbus.h | 212 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 212 insertions(+) create mode 100644 include/i2c/smbus.h diff --git a/include/i2c/smbus.h b/include/i2c/smbus.h new file mode 100644 index 0000000..bf7ed37 --- /dev/null +++ b/include/i2c/smbus.h @@ -0,0 +1,212 @@ +/* + smbus.h - SMBus level access helper functions + + Copyright (C) 1995-97 Simon G. Vogl + Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + MA 02110-1301 USA. +*/ + +#ifndef LIB_I2C_SMBUS_H +#define LIB_I2C_SMBUS_H + +#include <sys/ioctl.h> +#include <linux/types.h> +#include <linux/i2c.h> +#include <linux/i2c-dev.h> + +/* Compatibility defines */ +#ifndef I2C_SMBUS_I2C_BLOCK_BROKEN +#define I2C_SMBUS_I2C_BLOCK_BROKEN I2C_SMBUS_I2C_BLOCK_DATA +#endif +#ifndef I2C_FUNC_SMBUS_PEC +#define I2C_FUNC_SMBUS_PEC I2C_FUNC_SMBUS_HWPEC_CALC +#endif + +static inline __s32 i2c_smbus_access(int file, char read_write, __u8 command, + int size, union i2c_smbus_data *data) +{ + struct i2c_smbus_ioctl_data args; + + args.read_write = read_write; + args.command = command; + args.size = size; + args.data = data; + return ioctl(file, I2C_SMBUS, &args); +} + + +static inline __s32 i2c_smbus_write_quick(int file, __u8 value) +{ + return i2c_smbus_access(file, value, 0, I2C_SMBUS_QUICK, NULL); +} + +static inline __s32 i2c_smbus_read_byte(int file) +{ + union i2c_smbus_data data; + if (i2c_smbus_access(file, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &data)) + return -1; + else + return 0x0FF & data.byte; +} + +static inline __s32 i2c_smbus_write_byte(int file, __u8 value) +{ + return i2c_smbus_access(file, I2C_SMBUS_WRITE, value, + I2C_SMBUS_BYTE, NULL); +} + +static inline __s32 i2c_smbus_read_byte_data(int file, __u8 command) +{ + union i2c_smbus_data data; + if (i2c_smbus_access(file, I2C_SMBUS_READ, command, + I2C_SMBUS_BYTE_DATA, &data)) + return -1; + else + return 0x0FF & data.byte; +} + +static inline __s32 i2c_smbus_write_byte_data(int file, __u8 command, + __u8 value) +{ + union i2c_smbus_data data; + data.byte = value; + return i2c_smbus_access(file, I2C_SMBUS_WRITE, command, + I2C_SMBUS_BYTE_DATA, &data); +} + +static inline __s32 i2c_smbus_read_word_data(int file, __u8 command) +{ + union i2c_smbus_data data; + if (i2c_smbus_access(file, I2C_SMBUS_READ, command, + I2C_SMBUS_WORD_DATA, &data)) + return -1; + else + return 0x0FFFF & data.word; +} + +static inline __s32 i2c_smbus_write_word_data(int file, __u8 command, + __u16 value) +{ + union i2c_smbus_data data; + data.word = value; + return i2c_smbus_access(file, I2C_SMBUS_WRITE, command, + I2C_SMBUS_WORD_DATA, &data); +} + +static inline __s32 i2c_smbus_process_call(int file, __u8 command, __u16 value) +{ + union i2c_smbus_data data; + data.word = value; + if (i2c_smbus_access(file, I2C_SMBUS_WRITE, command, + I2C_SMBUS_PROC_CALL, &data)) + return -1; + else + return 0x0FFFF & data.word; +} + + +/* Returns the number of read bytes */ +static inline __s32 i2c_smbus_read_block_data(int file, __u8 command, + __u8 *values) +{ + union i2c_smbus_data data; + int i; + if (i2c_smbus_access(file, I2C_SMBUS_READ, command, + I2C_SMBUS_BLOCK_DATA, &data)) + return -1; + else { + for (i = 1; i <= data.block[0]; i++) + values[i-1] = data.block[i]; + return data.block[0]; + } +} + +static inline __s32 i2c_smbus_write_block_data(int file, __u8 command, + __u8 length, const __u8 *values) +{ + union i2c_smbus_data data; + int i; + if (length > 32) + length = 32; + for (i = 1; i <= length; i++) + data.block[i] = values[i-1]; + data.block[0] = length; + return i2c_smbus_access(file, I2C_SMBUS_WRITE, command, + I2C_SMBUS_BLOCK_DATA, &data); +} + +/* Returns the number of read bytes */ +/* Until kernel 2.6.22, the length is hardcoded to 32 bytes. If you + ask for less than 32 bytes, your code will only work with kernels + 2.6.23 and later. */ +static inline __s32 i2c_smbus_read_i2c_block_data(int file, __u8 command, + __u8 length, __u8 *values) +{ + union i2c_smbus_data data; + int i; + + if (length > 32) + length = 32; + data.block[0] = length; + if (i2c_smbus_access(file, I2C_SMBUS_READ, command, + length == 32 ? I2C_SMBUS_I2C_BLOCK_BROKEN : + I2C_SMBUS_I2C_BLOCK_DATA, &data)) + return -1; + else { + for (i = 1; i <= data.block[0]; i++) + values[i-1] = data.block[i]; + return data.block[0]; + } +} + +static inline __s32 i2c_smbus_write_i2c_block_data(int file, __u8 command, + __u8 length, + const __u8 *values) +{ + union i2c_smbus_data data; + int i; + if (length > 32) + length = 32; + for (i = 1; i <= length; i++) + data.block[i] = values[i-1]; + data.block[0] = length; + return i2c_smbus_access(file, I2C_SMBUS_WRITE, command, + I2C_SMBUS_I2C_BLOCK_BROKEN, &data); +} + +/* Returns the number of read bytes */ +static inline __s32 i2c_smbus_block_process_call(int file, __u8 command, + __u8 length, __u8 *values) +{ + union i2c_smbus_data data; + int i; + if (length > 32) + length = 32; + for (i = 1; i <= length; i++) + data.block[i] = values[i-1]; + data.block[0] = length; + if (i2c_smbus_access(file, I2C_SMBUS_WRITE, command, + I2C_SMBUS_BLOCK_PROC_CALL, &data)) + return -1; + else { + for (i = 1; i <= data.block[0]; i++) + values[i-1] = data.block[i]; + return data.block[0]; + } +} + +#endif /* LIB_I2C_SMBUS_H */
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