patch-2.3.34 linux/include/linux/i2c-dev.h

• Lines: 155
• Date: Thu Dec 16 13:59:38 1999
• Orig file: v2.3.33/linux/include/linux/i2c-dev.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.33/linux/include/linux/i2c-dev.h linux/include/linux/i2c-dev.h
@@ -0,0 +1,154 @@
+/*
+    i2c-dev.h - i2c-bus driver, char device interface
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef I2C_DEV_H
+#define I2C_DEV_H
+
+
+#include <linux/types.h>
+#include <linux/i2c.h>
+
+/* Some IOCTL commands are defined in <linux/i2c.h> */
+/* Note: 10-bit addresses are NOT supported! */
+
+/* This is the structure as used in the I2C_SMBUS ioctl call */
+struct i2c_smbus_ioctl_data {
+  char read_write;
+  __u8 command;
+  int size;
+  union i2c_smbus_data *data;
+};
+
+#ifndef __KERNEL__
+
+#include <sys/ioctl.h>
+
+extern 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);
+}
+
+
+extern inline __s32 i2c_smbus_write_quick(int file, __u8 value)
+{
+  return i2c_smbus_access(file,value,0,I2C_SMBUS_QUICK,NULL);
+}
+
+extern 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;
+}
+
+extern inline __s32 i2c_smbus_write_byte(int file, __u8 value)
+{
+  return i2c_smbus_access(file,I2C_SMBUS_WRITE,value, I2C_SMBUS_BYTE,NULL);
+}
+
+extern 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;
+}
+
+extern 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);
+}
+
+extern 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;
+}
+
+extern 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);
+}
+
+extern 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 */
+extern 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];
+  }
+}
+
+extern inline __s32 i2c_smbus_write_block_data(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;
+  return i2c_smbus_access(file,I2C_SMBUS_WRITE,command,I2C_SMBUS_BLOCK_DATA,
+                          &data);
+}
+
+#endif /* ndef __KERNEL__ */
+
+#endif