/*
 * Copyright 2012 Haiku, Inc.  All rights reserved.
 * Distributed under the terms of the MIT license.
 *
 * Authors:
 *              Gerald Zajac
 */

/*!
        Haiku Intel-810 video driver was adapted from the X.org intel driver which
        has the following copyright.

        Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
        All Rights Reserved.
 */


#include "accelerant.h"
#include "i810_regs.h"


#define DPMS_SYNC_SELECT        0x5002
#define H_SYNC_OFF                      0x02
#define V_SYNC_OFF                      0x08


uint32
I810_DPMSCapabilities(void)
{
        // Return DPMS modes supported by this device.

        return B_DPMS_ON | B_DPMS_STAND_BY | B_DPMS_SUSPEND | B_DPMS_OFF;
}


uint32
I810_GetDPMSMode(void)
{
        // Return the current DPMS mode.

        uint32 tmp = INREG8(DPMS_SYNC_SELECT) & (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("I810_DPMSMode() mode: %d\n", mode);
        return mode;
}


status_t
I810_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("I810_SetDPMSMode() mode: %d\n", dpmsMode);

        uint8 seq01 = ReadSeqReg(1) & ~0x20;
        uint8 dpmsSyncSelect = 0;

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

                case B_DPMS_STAND_BY:
                        // Screen: Off; HSync: Off, VSync: On.
                        seq01 |= 0x20;
                        dpmsSyncSelect = H_SYNC_OFF;
                        break;

                case B_DPMS_SUSPEND:
                        // Screen: Off; HSync: On, VSync: Off.
                        seq01 |= 0x20;
                        dpmsSyncSelect = V_SYNC_OFF;
                        break;

                case B_DPMS_OFF:
                        // Screen: Off; HSync: Off, VSync: Off.
                        seq01 |= 0x20;
                        dpmsSyncSelect = H_SYNC_OFF | V_SYNC_OFF;
                        break;

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

        WriteSeqReg(1, seq01);          // turn the screen on/off
        OUTREG8(DPMS_SYNC_SELECT, dpmsSyncSelect);              // set DPMS mode

        return B_OK;
}