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/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* power_button.h - Power button function.
* Hides chip-specific implementation behind this interface.
*/
#ifndef __CHIP_INTERFACE_POWER_BUTTON_H
#define __CHIP_INTERFACE_POWER_BUTTON_H
/*
* Initialize the power button as GPIO input pin and enable interrupt for
* keyboard scanner code.
*/
EcError EcPowerButtonInit(void);
/* Calls GPIOPinRead() to read the GPIO state. */
/* TODO: has the state been debounced? */
EcError EcPowerButtonGetState(void);
/* Register a calback function. It is called while power button is changing its
* state (pressed or released ).
*/
EcError EcPowerButtonRegister(void (*callback)(void));
/* Below is the example code to register this function. */
#if 0
/* This callback function is implemented in Chrome OS features layer. */
void PowerButtonCallback(void) {
int pressed = EcPowerButtonGetState();
if (!prev_status) {
if (pressed) {
// Power button is just pressed. Generate scan code,
// and kick off the state machine for PWRBTN# signal.
}
} else {
if (!pressed) {
// Power button is just released. Generate scan code,
// and clear the state machine.
}
}
}
... somewhere in init code ...
EcPowerButtonRegister(PowerButtonCallback);
#endif /* #if 0 */
#endif /* __CHIP_INTERFACE_POWER_BUTTON_H */
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