genode/repos/os/include/gpio_session/gpio_session.h

/*
 * \brief  Gpio session interface
 * \author Ivan Loskutov <ivan.loskutov@ksyslabs.org>
 * \author Stefan Kalkowski <stefan.kalkowski@genode-labs.com>
 * \date   2012-06-23
 */

/*
 * Copyright (C) 2012 Ksys Labs LLC
 * Copyright (C) 2012-2017 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU Affero General Public License version 3.
 */

#ifndef _INCLUDE__GPIO_SESSION__GPIO_SESSION_H_
#define _INCLUDE__GPIO_SESSION__GPIO_SESSION_H_

#include <base/signal.h>
#include <dataspace/capability.h>
#include <session/session.h>
#include <irq_session/capability.h>

namespace Gpio { struct Session; }


struct Gpio::Session : Genode::Session
{
	/**
	 * \noapi
	 */
	static const char *service_name() { return "Gpio"; }

	enum { CAP_QUOTA = 2 };

	enum Direction { IN, OUT };

	enum Irq_type  { LOW_LEVEL, HIGH_LEVEL, FALLING_EDGE, RISING_EDGE };

	virtual ~Session() { }

	/**
	 * Configure direction of the GPIO pin
	 *
	 * \param d  direction of the pin
	 */
	virtual void direction(Direction d) = 0;

	/**
	 * Write the logic level of the GPIO pin
	 *
	 * \param enable  logic level on the pin
	 */
	virtual void write(bool enable) = 0;

	/**
	 * Read the logic level on a specified GPIO pin
	 *
	 * \return  level on specified GPIO pin
	 */
	virtual bool read() = 0;

	/**
	 * Set the debouncing time
	 *
	 * \param us  debouncing time in microseconds, zero means no debouncing
	 */
	virtual void debouncing(unsigned int us) = 0;

	/**
	 * Rquest IRQ session
	 *
	 * \param type  type of IRQ
	 */
	virtual Genode::Irq_session_capability irq_session(Irq_type type) = 0;


	/*******************
	 ** RPC interface **
	 *******************/

	GENODE_RPC(Rpc_direction,   void, direction, Direction);
	GENODE_RPC(Rpc_write,       void, write, bool);
	GENODE_RPC(Rpc_read,        bool, read);
	GENODE_RPC(Rpc_debouncing,  void, debouncing, unsigned int);
	GENODE_RPC(Rpc_irq_session, Genode::Irq_session_capability,
	                            irq_session, Irq_type);

	GENODE_RPC_INTERFACE(Rpc_direction, Rpc_write, Rpc_read,
	                     Rpc_debouncing, Rpc_irq_session);
};

#endif /* _INCLUDE__GPIO_SESSION__GPIO_SESSION_H_ */