tilt/SensorBase.cpp

/*
* Copyright (C) 2015 Intel Corp
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

#include <fcntl.h>
#include <errno.h>
#include <math.h>
#include <poll.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/select.h>
#include <cutils/log.h>
#include <linux/input.h>
#include "SensorBase.h"


SensorBase::SensorBase(const char* dev_name,
			const char* data_name) : dev_name(dev_name),
			data_name(data_name),
			dev_fd(-1),
			data_fd(-1)
{
	/* FUNC_LOG; */
	ALOGV("%s(): dev_name=%s, data_name=%s ", __func__, dev_name, data_name);

	if (data_name)
		data_fd = openInput(data_name);

}

SensorBase::~SensorBase() {
	FUNC_LOG;
	if (data_fd >= 0)
		close(data_fd);

	if (dev_fd >= 0)
		close(dev_fd);

}

int SensorBase::open_device() {
	FUNC_LOG;
	if (dev_fd<0 && dev_name) {
		dev_fd = open(dev_name, O_RDONLY);
		LOGE_IF(dev_fd<0, "Couldn't open %s (%s)", dev_name, strerror(errno));
	}
	return 0;
}

int SensorBase::close_device() {
	FUNC_LOG;
	if (dev_fd >= 0) {
		close(dev_fd);
		dev_fd = -1;
	}
	return 0;
}

int SensorBase::getFd() const {
	FUNC_LOG;
	if (!data_name)
		return dev_fd;

	return data_fd;
}

int SensorBase::setDelay(int32_t handle, int64_t ns) {
	FUNC_LOG;
	return 0;
}

bool SensorBase::hasPendingEvents() const {
	FUNC_LOG;
	return false;
}

int64_t SensorBase::getTimestamp() {
	FUNC_LOG;
	struct timespec t;
	t.tv_sec = t.tv_nsec = 0;
	clock_gettime(CLOCK_MONOTONIC, &t);
	return int64_t(t.tv_sec) * 1000000000LL + t.tv_nsec;
}

int SensorBase::openInput(const char* inputName) {
	FUNC_LOG;
	int fd = -1;
	const char *dirname = "/dev/input";
	char devname[PATH_MAX];
	char *filename;
	DIR *dir;
	struct dirent *de;
	dir = opendir(dirname);
	if(dir == NULL)
		return -1;
	strcpy(devname, dirname);
	filename = devname + strlen(devname);
	*filename++ = '/';
	while((de = readdir(dir))) {
		if(de->d_name[0] == '.' &&
				(de->d_name[1] == '\0' ||
				(de->d_name[1] == '.' && de->d_name[2] == '\0')))
			continue;
		strcpy(filename, de->d_name);
		fd = open(devname, O_RDONLY);
		LOGV_IF(EXTRA_VERBOSE, "path open %s", devname);
		LOGI("path open %s", devname);
		if (fd >= 0) {
			char name[80];
			if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1)
				name[0] = '\0';

			LOGV_IF(EXTRA_VERBOSE, "name read %s", name);
			if (!strcmp(name, inputName)) {
				strcpy(input_name, filename);
				break;
			} else {
				close(fd);
				fd = -1;
			}
		}
	}
	closedir(dir);
	LOGE_IF(fd < 0, "couldn't find '%s' input device", inputName);
	return fd;
}

int SensorBase::enable(int32_t handle, int enabled)
{
	FUNC_LOG;
	return 0;
}

int SensorBase::isActivated(int /* handle */)
{
	FUNC_LOG;
	return 0;
}

#ifdef HAL_VERSION_GT_1_0
int SensorBase::batch(int handle, int flags, int64_t period_ns, int64_t timeout)
{
	FUNC_LOG;
	return 0;
}
#endif