driveri2c.cpp

完整的基于Conxant平台的USB电视棒的WIN驱动程序。

/*+++ *******************************************************************\ 
* 
*  Copyright and Disclaimer: 
*  
*     --------------------------------------------------------------- 
*     This software is provided "AS IS" without warranty of any kind, 
*     either expressed or implied, including but not limited to the 
*     implied warranties of noninfringement, merchantability and/or 
*     fitness for a particular purpose.
*     --------------------------------------------------------------- 
*   
*     Copyright (c) 2008 Conexant Systems, Inc. 
*     All rights reserved. 
*
\******************************************************************* ---*/ 
#include "DriverI2C.h"
#include "UsbI2cInterface.h"
#include "debug.h"


/////////////////////////////////////////////////////////////////////////////////////////
DriverI2C::DriverI2C(UsbI2cInterface* p_usb_i2c_interface, BYTE channel):
    _p_usb_i2c_interface(p_usb_i2c_interface),
    _channel(channel)
{
    DbgLogInfo(("DriverI2C::DriverI2C constructor\n"));
    // Increase the reference count
    _p_usb_i2c_interface->addRef();
    _max_transfer_size = _p_usb_i2c_interface->maxTransferSize(); 
}

/////////////////////////////////////////////////////////////////////////////////////////
DriverI2C::~DriverI2C()
{
    // Decrease the reference count
    _p_usb_i2c_interface->release();
}

NTSTATUS DriverI2C::setCommandFormat(BOOLEAN first,BOOLEAN last)
{
    if(!_p_usb_i2c_interface)
        return (STATUS_UNSUCCESSFUL);
    else
        return _p_usb_i2c_interface->setCommandFormat(first,last);
    
}

/////////////////////////////////////////////////////////////////////////////////////////
INT DriverI2C::addRef()
{
    return _p_usb_i2c_interface->addRef();
}

/////////////////////////////////////////////////////////////////////////////////////////
INT DriverI2C::release()
{
    return _p_usb_i2c_interface->release();
}

/////////////////////////////////////////////////////////////////////////////////////////
DWORD DriverI2C::maxTransferSize()
{
    return _max_transfer_size;
}

/////////////////////////////////////////////////////////////////////////////////////////
BOOLEAN DriverI2C::write( 
                         BYTE        device_adr, 
                         INT         subaddr_size,
                         const BYTE  *p_subaddr_buf,
                         INT         write_size,
                         BYTE        *p_write_buf)
{
    BOOLEAN result = FALSE;

    // check for maximum size
    if(write_size > (INT)maxTransferSize())
    {
        return result;
    }

    // acquire the lock
    _p_usb_i2c_interface->lock();

    result = _p_usb_i2c_interface->write(device_adr, 
                                        subaddr_size, 
                                        p_subaddr_buf, 
                                        write_size, 
                                        p_write_buf, 
                                        _channel);

    // release the lock
    _p_usb_i2c_interface->unlock();

    return result;
}

/////////////////////////////////////////////////////////////////////////////////////////
BOOLEAN DriverI2C::read( 
                        BYTE        device_adr, 
                        INT         subaddr_size, 
                        const BYTE  *p_subaddr_buf,
                        INT         read_size,
                        BYTE        *p_read_buf)
{
    BOOLEAN result = FALSE;

    // check for maximum size
    if(read_size > (INT)maxTransferSize())
    {
        return result;
    }

    // acquire the lock
    _p_usb_i2c_interface->lock();
	
    result = _p_usb_i2c_interface->read(device_adr, 
                                        subaddr_size, 
                                        p_subaddr_buf, 
                                        read_size, 
                                        p_read_buf, 
                                        _channel);

    // release the lock
    _p_usb_i2c_interface->unlock();

    return result;
}