genode/repos/os/include/gpio/driver.h

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/*
* \brief GPIO driver interface
* \author Stefan Kalkowski
* \date 2013-05-03
*/
/*
* Copyright (C) 2011-2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__GPIO__DRIVER_H_
#define _INCLUDE__GPIO__DRIVER_H_
/* Genode includes */
#include <base/signal.h>
namespace Gpio {
struct Driver;
}
struct Gpio::Driver {
/**
* Set direction of GPIO pin, whether it's an input or output one
*
*\param gpio corresponding gpio pin number
*/
virtual void direction(unsigned gpio, bool input) = 0;
/**
* Set output level (high or low)
*
*\param gpio corresponding gpio pin number
*/
virtual void write(unsigned gpio, bool enable) = 0;
/**
* Read input level (high or low)
*
*\param gpio corresponding gpio pin number
*/
virtual bool read(unsigned gpio) = 0;
/**
* Enable/disable debounce logic for the GPIO pin
*
*\param gpio corresponding gpio pin number
*/
virtual void debounce_enable(unsigned gpio, bool enable) = 0;
/**
* Set delay for debounce logic for the GPIO pin
*
*\param gpio corresponding gpio pin number
*/
virtual void debounce_time(unsigned gpio, unsigned long us) = 0;
/**
* Set IRQ trigger state to falling edge-triggered
*
*\param gpio corresponding gpio pin number
*/
virtual void falling_detect(unsigned gpio) = 0;
/**
* Set IRQ trigger state to rising edge-triggered
*
*\param gpio corresponding gpio pin number
*/
virtual void rising_detect(unsigned gpio) = 0;
/**
* Set IRQ trigger state to high level-triggered
*
*\param gpio corresponding gpio pin number
*/
virtual void high_detect(unsigned gpio) = 0;
/**
* Set IRQ trigger state to low level-triggered
*
*\param gpio corresponding gpio pin number
*/
virtual void low_detect(unsigned gpio) = 0;
/**
* Enable/disable IRQ for specified GPIO pin
*
*\param gpio corresponding gpio pin number
*/
virtual void irq_enable(unsigned gpio, bool enable) = 0;
/**
* Register signal handler for interrupts
*
*\param gpio corresponding gpio pin number
*/
virtual void register_signal(unsigned gpio,
Genode::Signal_context_capability cap) = 0;
/**
* Unregister signal handler
*
*\param gpio corresponding gpio pin number
*/
virtual void unregister_signal(unsigned gpio) = 0;
/**
* Check whether GPIO number is valid
*
*\param gpio corresponding gpio pin number
*/
virtual bool gpio_valid(unsigned gpio) = 0;
};
#endif /* _INCLUDE__GPIO__DRIVER_H_ */