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
13 years ago · 0f23bf3ac3
1 changed files with 212 additions and 0 deletions
--- a/include/i2c/smbus.h
+++ 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 */