driver_api.h

来自「cache test for arm920 core」· C头文件 代码 · 共 51 行

//==================================================================
// 
//  FILE:           driver_api.h
//
//  DESCRIPTION:    Driver API definition
//
//  Copyright Cirrus Logic Corporation, 2001.  All rights reserved
//
//==================================================================
#ifndef _VS_DRIVER_API_H_
#define _VS_DRIVER_API_H_

#include "vs_types.h"

//-----------------------------------------------------------------------------
// VS_DRIVER_API
//-----------------------------------------------------------------------------
// Driver API is a data structure that contains methods and attributes for 
// operating a device for normal use.  The description below defines each 
// member of the structure.  All member functions should be implemented and 
// should not be set to 0.  The 'param' can be pointer to any data structure,
// as long as the calling program and the subroutine agree on the type of 
// 'param' and  cast them appropriately.  
//
// "Member" functions
// ------------------
//
// Open
//    This function opens an instance of a driver given the parameters that
//      are passed in to the *param value. 
//
// Ioctl
//    A generic ioctl function whose behavior depends on the value 'ioctl'.  
//      Each module should define its own set of ioctl values, and these values
//      should be published in the module header file.
//   
// Close
//    Function that closes an instance of a driver.
//    
// GetLastError
//    Function that returns the error number caused by the last error.
//
typedef struct _VS_DRIVER_API
{
    HANDLE (*Open)(void *param);
    INT (*Ioctl)(HANDLE Handle, UINT ioctl, void *param);
    INT (*Close)(HANDLE Handle);
    INT (*GetLastError)(HANDLE Handle);
} VS_DRIVER_API;

#endif // _VS_DRIVER_API_H_