ms2_backlight.cpp

PXA270平台下WINCE6.0的背光控制驱动

//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
//
// Use of this sample source code is subject to the terms of the Microsoft
// license agreement under which you licensed this sample source code. If
// you did not accept the terms of the license agreement, you are not
// authorized to use this sample source code. For the terms of the license,
// please see the license agreement between you and Microsoft or, if applicable,
// see the LICENSE.RTF on your install media or the root of your tools installation.
// THE SAMPLE SOURCE CODE IS PROVIDED "AS IS", WITH NO WARRANTIES.
//
//
//------------------------------------------------------------------------------
//
//  File: ms2_backlight.c
//
//  Backlight PDD driver source code, Mainstone-specific
//
#include <windows.h>
#include <ceddk.h>
#include <bulverde.h>

#ifdef  RETAIL_DEBUG
#ifndef DEBUG
#define DEBUG 1
extern DBGPARAM dpCurSettings;
#undef DEBUGMSG
#define DEBUGMSG RETAILMSG
#endif
#endif

#ifdef DEBUG
#define ZONE_BACKLIGHT      DEBUGZONE(0)
#define ZONE_FUNCTION       DEBUGZONE(1)
#define ZONE_ERROR          DEBUGZONE(15)
#else
#define ZONE_BACKLIGHT      1
#define ZONE_FUNCTION       1
#define ZONE_ERROR          1
#endif


volatile XLLP_GPIO_T * v_pGPIORegs = NULL;  // used to access hardware bits for bkl on/off


//-----------------------------------------------------------------------------
//  Initialize hardware etc
//  Returned DWORD will be passed to BacklightDeInit and should be used to store context if necessary
//  pDeviceState should be set to the start state of the backlight (usually D0)
//

extern "C"
DWORD BacklightInit(LPCTSTR pContext, LPCVOID lpvBusContext, CEDEVICE_POWER_STATE *pDeviceState)
{
    PHYSICAL_ADDRESS ioPhysicalBase = {BULVERDE_BASE_REG_PA_GPIO, 0 };
    v_pGPIORegs = (volatile XLLP_GPIO_T *)MmMapIoSpace(ioPhysicalBase, sizeof(XLLP_GPIO_T),FALSE);
    if (!v_pGPIORegs)
    {
        return FALSE;
    }

    DEBUGMSG(ZONE_BACKLIGHT, (TEXT("BKL: Init\r\n")));
    v_pGPIORegs->GPCR0 |= XLLP_GPIO_BIT_PWM_OUT0; // turn backlight off
    *pDeviceState = D4;

    return TRUE;
}

extern "C"
void BacklightDeInit(DWORD dwContext)
{
    DEBUGMSG(ZONE_BACKLIGHT, (TEXT("BKL: De-Init\r\n")));
    if (v_pGPIORegs != NULL) {
       MmUnmapIoSpace((PVOID)v_pGPIORegs, sizeof(XLLP_GPIO_T));
    }
    return;
}

extern "C"
BOOL BackLightSetState(DWORD dwContext, CEDEVICE_POWER_STATE state)
{
    // sets the backlight state (turns the backlight on and off)
    DEBUGMSG(ZONE_FUNCTION, (L"+BackLightSetState(0x%08x)\r\n", (DWORD) state));

    switch (state)
    {
        case D0:
            v_pGPIORegs->GPSR0 |= XLLP_GPIO_BIT_PWM_OUT0;
            DEBUGMSG(ZONE_FUNCTION, (L"+BackLightSetState - ON\r\n"));
            break;
        case D1:
        case D2:
        case D3:
        case D4:
            v_pGPIORegs->GPCR0 |= XLLP_GPIO_BIT_PWM_OUT0;
            DEBUGMSG(ZONE_FUNCTION, (L"+BackLightSetState - OFF\r\n"));
            break;
        default:
            RETAILMSG(ZONE_ERROR, (L"+BackLightSetState - Unsupported power state!\r\n"));
            return FALSE;
    }
    return TRUE;
}

extern "C"
UCHAR BacklightGetSupportedStates()
{
    return DX_MASK(D0) | DX_MASK(D4);     //support D0, D4 (ON, OFF)
}

extern "C"
DWORD BacklightIOControl(DWORD dwOpenContext, DWORD dwIoControlCode, LPBYTE lpInBuf, 
                   DWORD nInBufSize, LPBYTE lpOutBuf, DWORD nOutBufSize, 
                   LPDWORD lpBytesReturned)
{
    // For IOCTls that MDD doesn't know. ie non-pm IOCTLs
    return ERROR_NOT_SUPPORTED;
}

extern "C"
void BacklightRegChanged()
{
    // Called when the MDD gets a backlight registry changed event
    // eg: read brightness settings from registry and update backlight accordingly
    return;
}

extern "C"
void BacklightPwrSrcChanged(BOOL fOnAC)
{
    // Called when the MDD gets a power source changed (AC->DC or vice-versa) event
    // fOnAC will indicate whether the power source is now AC. TRUE->AC FALSE->Battery
    // eg: update brightness of backlight according to user settings
    return;
}