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DevMgr_Nuttx.cpp
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141 lines (118 loc) · 3.49 KB
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/**********************************************************************
* Copyright (c) 2015 Mark Charlebois
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted (subject to the limitations in the
* disclaimer below) provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Dronecode Project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
* GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT
* HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*************************************************************************/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include "DriverFramework.hpp"
#include "DevMgr.hpp"
#include <stdlib.h>
#include <errno.h>
#include <dirent.h>
#include <poll.h>
#include <sys/ioctl.h>
using namespace DriverFramework;
int DevMgr::initialize(void)
{
return 0;
}
void DevMgr::finalize(void)
{
}
void DevMgr::getHandle(const char *dev_path, DevHandle &h)
{
if (dev_path == nullptr) {
h.m_errno = EINVAL;
return;
}
h.m_errno = EBADF;
if (h.m_fd >= 0) {
::close(h.m_fd);
}
h.m_fd = ::open(dev_path, O_RDONLY);
if (h.m_fd < 0) {
h.m_errno = errno;
}
}
void DevMgr::releaseHandle(DevHandle &h)
{
::close(h.m_fd);
h.m_fd = -1;
h.m_errno = 0;
}
void DevMgr::setDevHandleError(DevHandle &h, int error)
{
h.m_errno = error;
}
int DevMgr::getNextDeviceName(unsigned int &index, const char **dev_path)
{
unsigned idx = 0;
/* list directory */
DIR *d = ::opendir("/dev");
if (d) {
struct dirent *direntry;
char devname[50];
while ((direntry = readdir(d)) != nullptr) {
if (idx == index) {
snprintf(devname, sizeof(devname), "/dev/%s", direntry->d_name);
*dev_path = direntry->d_name;
++index;
return 0;
}
}
}
return -1;
}
//------------------------------------------------------------------------
// DevHandle
//------------------------------------------------------------------------
DevHandle::~DevHandle()
{
if (isValid()) {
DevMgr::releaseHandle(*this);
}
}
int DevHandle::ioctl(unsigned long cmd, unsigned long arg)
{
return ::ioctl(m_fd, cmd, arg);
}
ssize_t DevHandle::read(void *buf, size_t len)
{
return ::read(m_fd, buf, len);
}
ssize_t DevHandle::write(const void *buf, size_t len)
{
return ::write(m_fd, buf, len);
}