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2017-05-23 Fred Gleason <fredg@paravelsystems.com>

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* Added an 'RDMatrix::KernelGpio' element to the 'RDMatrix::Type enum.
	* Implemented a Kernel GPIO switcher driver in 'ripcd/kernelgpio.cpp'
	and 'ripcd/kernelgpio.h'.
This commit is contained in:
Fred Gleason
2017-05-23 10:24:26 -04:00
parent 5d055932b1
commit 3b14fbfa10
12 changed files with 614 additions and 4 deletions
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71
lib/rdkernelgpio.h Normal file
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// rdkernelgpio.h
//
// Control Class for the Linux SysFS GPIO Interface
//
// (C) Copyright 2017 Fred Gleason <fredg@paravelsystems.com>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU Library General Public License
// version 2 as published by the Free Software Foundation.
//
// 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.
//
// You should have received a copy of the GNU General Public
// License along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
#ifndef RDKERNELGPIO_H
#define RDKERNELGPIO_H
#include <stdio.h>
#include <vector>
#include <qobject.h>
#include <qtimer.h>
//
// See https://www.kernel.org/doc/Documentation/gpio/sysfs.txt
// for an explanation of this interface.
//
#define KERNELGPIO_SYS_FILE QString("/sys/class/gpio")
#define KERNELGPIO_POLL_INTERVAL 20
class RDKernelGpio : public QObject
{
Q_OBJECT;
public:
enum Direction {In=0,Out=1};
enum Edge {None=0,Rising=1,Falling=2,Both=3};
RDKernelGpio(QObject *parent=0);
~RDKernelGpio();
bool addGpio(int gpio);
bool removeGpio(int gpio);
Direction direction(int gpio, bool *ok=NULL) const;
bool setDirection(int gpio,Direction dir) const;
bool activeLow(int gpio, bool *ok=NULL) const;
bool setActiveLow(int gpio,bool state) const;
bool value(int gpio,bool *ok=NULL) const;
public slots:
bool setValue(int gpio,bool state) const;
private slots:
void pollData();
signals:
void valueChanged(int gpio,bool state);
private:
FILE *OpenNode(const QString &name,const char *mode,int gpio=-1) const;
std::vector<int> gpio_gpios;
std::vector<bool> gpio_states;
QTimer *gpio_poll_timer;
};
#endif // RDKERNELGPIO_H