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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2018 Patrick Rudolph <siro@das-labor.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <ec/acpi/ec.h>
#include "h8.h"
/**
* Return the EC sense status register state.
*
* Observations showed the sense registers are all zero until the EC populates
* them after some time. Likely the EC sets all bits to it's valid state at
* once, but there's no prove as the firmware isn't available.
*
* Wait for any register having at least one bit set.
* Unlikely that all register will be zero after booting has finished.
*
* @return 1 if the EC provides valid data in sense status registers
*/
int h8_get_sense_ready(void)
{
static const u8 regs[] = { H8_STATUS0, H8_STATUS1, H8_STATUS2,
H8_STATUS3};
for (size_t i = 0; i < ARRAY_SIZE(regs); i++) {
if (ec_read(regs[i]))
return 1;
}
return 0;
}
/**
* Return the state of Fn key.
* Only valid if h8_get_sense_ready (see above) returns true.
*
* @return 1 if the key is pressed.
*/
int h8_get_fn_key(void)
{
return ec_read(H8_STATUS0) & H8_STATUS0_FN_KEY_DOWN;
}
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