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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#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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