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

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

#include <string.h>
#include <ddc.h>
#include <edid.h>



static status_t
GetI2CSignals(void* cookie, int* _clock, int* data)
{
        (void)cookie;           // avoid compiler warning for unused arg

        uint32 reg = INREG32(VIDEO_SERIAL_PARALLEL_PORT);
        *_clock = (reg & VSP_SCL0_IN) ? 1 : 0;;
        *data = (reg & VSP_SDA0_IN) ? 1 : 0;
        return B_OK;
}


static status_t
SetI2CSignals(void* cookie, int _clock, int data)
{
        (void)cookie;           // avoid compiler warning for unused arg

        uint32 reg = (INREG32(VIDEO_SERIAL_PARALLEL_PORT)
                & ~(VSP_SDA0_OUT | VSP_SCL0_OUT));
        reg = (reg | (_clock ? VSP_SCL0_OUT : 0) | (data ? VSP_SDA0_OUT : 0));
        OUTREG32(VIDEO_SERIAL_PARALLEL_PORT, reg);
        return B_OK;
}



bool
TDFX_GetEdidInfo(edid1_info& edidInfo)
{
        // Get the EDID info and return true if successful.

        i2c_bus bus;

        bus.cookie = (void*)NULL;
        bus.set_signals = &SetI2CSignals;
        bus.get_signals = &GetI2CSignals;
        ddc2_init_timing(&bus);

        uint32 reg = INREG32(VIDEO_SERIAL_PARALLEL_PORT);
        OUTREG32(VIDEO_SERIAL_PARALLEL_PORT, reg | VSP_ENABLE_IIC0);

        bool bResult = (ddc2_read_edid1(&bus, &edidInfo, NULL, NULL) == B_OK);

        OUTREG32(VIDEO_SERIAL_PARALLEL_PORT, reg);

        return bResult;
}