/*
        Copyright 2010 Haiku, Inc.  All rights reserved.
        Distributed under the terms of the MIT license.

        Authors:
        Gerald Zajac 2010
*/


#include "accelerant.h"
#include "3dfx.h"



#define H_SYNC_OFF      BIT(3)
#define V_SYNC_OFF      BIT(1)


uint32
TDFX_DPMSCapabilities(void)
{
        // Return DPMS modes supported by this device.

        return B_DPMS_ON | B_DPMS_STAND_BY | B_DPMS_SUSPEND | B_DPMS_OFF;
}


uint32
TDFX_GetDPMSMode(void)
{
        // Return the current DPMS mode.

        uint32 tmp = INREG32(DAC_MODE) & (H_SYNC_OFF | V_SYNC_OFF);
        uint32 mode;

        if (tmp == 0 )
                mode = B_DPMS_ON;
        else if (tmp == H_SYNC_OFF)
                mode = B_DPMS_STAND_BY;
        else if (tmp == V_SYNC_OFF)
                mode = B_DPMS_SUSPEND;
        else
                mode = B_DPMS_OFF;

        TRACE("TDFX_DPMSMode() mode: %d\n", mode);
        return mode;
}


status_t
TDFX_SetDPMSMode(uint32 dpmsMode)
{
        // Set the display into one of the Display Power Management modes,
        // and return B_OK if successful, else return B_ERROR.

        TRACE("TDFX_SetDPMSMode() mode: %d\n", dpmsMode);

        uint32 dacMode = INREG32(DAC_MODE) & ~(H_SYNC_OFF | V_SYNC_OFF);

        switch (dpmsMode) {
                case B_DPMS_ON:
                        // Screen: On; HSync: On, VSync: On.
                        break;

                case B_DPMS_STAND_BY:
                        // Screen: Off; HSync: Off, VSync: On.
                        dacMode |= H_SYNC_OFF;
                        break;

                case B_DPMS_SUSPEND:
                        // Screen: Off; HSync: On, VSync: Off.
                        dacMode |= V_SYNC_OFF;
                        break;

                case B_DPMS_OFF:
                        // Screen: Off; HSync: Off, VSync: Off.
                        dacMode |= H_SYNC_OFF | V_SYNC_OFF;
                        break;

                default:
                        TRACE("Invalid DPMS mode %d\n", dpmsMode);
                        return B_ERROR;
        }

        OUTREG32(DAC_MODE, dacMode);
        return B_OK;
}