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/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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)
{
if (data_name) {
data_fd = openInput(data_name);
}
}
SensorBase::~SensorBase() {
if (data_fd >= 0) {
close(data_fd);
}
if (dev_fd >= 0) {
close(dev_fd);
}
}
int SensorBase::open_device() {
if (dev_fd<0 && dev_name) {
dev_fd = open(dev_name, O_RDONLY);
ALOGE_IF(dev_fd<0, "Couldn't open %s (%s)", dev_name, strerror(errno));
}
return 0;
}
int SensorBase::close_device() {
if (dev_fd >= 0) {
close(dev_fd);
dev_fd = -1;
}
return 0;
}
int SensorBase::write_sys_attribute(
const char *path, const char *value, int bytes)
{
int fd, amt;
fd = open(path, O_WRONLY);
if (fd < 0) {
ALOGE("SensorBase: write_attr failed to open %s (%s)",
path, strerror(errno));
return -1;
}
amt = write(fd, value, bytes);
amt = ((amt == -1) ? -errno : 0);
ALOGE_IF(amt < 0, "SensorBase: write_int failed to write %s (%s)",
path, strerror(errno));
close(fd);
return amt;
}
int SensorBase::getFd() const {
if (!data_name) {
return dev_fd;
}
return data_fd;
}
int SensorBase::setDelay(int32_t handle, int64_t ns) {
return 0;
}
int64_t SensorBase::getDelay(int32_t handle) {
return 0;
}
bool SensorBase::hasPendingEvents() const {
return false;
}
int64_t SensorBase::getTimestamp() {
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) {
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);
if (fd>=0) {
char name[80];
if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
name[0] = '\0';
}
if (!strcmp(name, inputName)) {
strcpy(input_name, filename);
break;
} else {
close(fd);
fd = -1;
}
}
}
closedir(dir);
ALOGE_IF(fd<0, "couldn't find '%s' input device", inputName);
return fd;
}
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