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/*
* Copyright (C) 2013 Paul Kocialkowski
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <fcntl.h>
#include <errno.h>
#include <math.h>
#include <linux/ioctl.h>
#include <linux/input.h>
#include <hardware/sensors.h>
#include <hardware/hardware.h>
#define LOG_TAG "piranha_sensors"
#include <utils/Log.h>
#include "piranha_sensors.h"
struct gp2a_proximity_data {
char path_enable[PATH_MAX];
};
int gp2a_proximity_init(struct piranha_sensors_handlers *handlers, struct piranha_sensors_device *device)
{
struct gp2a_proximity_data *data = NULL;
char path[PATH_MAX] = { 0 };
int input_fd = -1;
int rc;
LOGD("%s(%p, %p)", __func__, handlers, device);
if (handlers == NULL)
return -EINVAL;
input_fd = input_open("proximity_sensor");
if (input_fd < 0) {
LOGE("%s: Unable to open input", __func__);
goto error;
}
rc = sysfs_path_prefix("proximity_sensor", (char *) &path);
if (rc < 0 || path[0] == '\0') {
LOGE("%s: Unable to open sysfs", __func__);
goto error;
}
data = (struct gp2a_proximity_data *) calloc(1, sizeof(struct gp2a_proximity_data));
snprintf(data->path_enable, PATH_MAX, "%s/enable", path);
handlers->poll_fd = input_fd;
handlers->data = (void *) data;
return 0;
error:
if (input_fd >= 0)
close(input_fd);
if (data != NULL)
free(data);
handlers->poll_fd = -1;
handlers->data = NULL;
return -1;
}
int gp2a_proximity_deinit(struct piranha_sensors_handlers *handlers)
{
int input_fd;
LOGD("%s(%p)", __func__, handlers);
if (handlers == NULL)
return -EINVAL;
input_fd = handlers->poll_fd;
if (input_fd >= 0)
close(input_fd);
handlers->poll_fd = -1;
if (handlers->data != NULL)
free(handlers->data);
handlers->data = NULL;
return 0;
}
int gp2a_proximity_activate(struct piranha_sensors_handlers *handlers)
{
struct gp2a_proximity_data *data;
char enable[] = "1\n";
int fd;
LOGD("%s(%p)", __func__, handlers);
if (handlers == NULL || handlers->data == NULL)
return -EINVAL;
data = (struct gp2a_proximity_data *) handlers->data;
fd = open(data->path_enable, O_WRONLY);
if (fd < 0) {
LOGE("%s: Unable to open enable path", __func__);
return -1;
}
write(fd, &enable, sizeof(enable));
close(fd);
handlers->activated = 1;
return 0;
}
int gp2a_proximity_deactivate(struct piranha_sensors_handlers *handlers)
{
struct gp2a_proximity_data *data;
char enable[] = "0\n";
int fd;
LOGD("%s(%p)", __func__, handlers);
if (handlers == NULL || handlers->data == NULL)
return -EINVAL;
data = (struct gp2a_proximity_data *) handlers->data;
fd = open(data->path_enable, O_WRONLY);
if (fd < 0) {
LOGE("%s: Unable to open enable path", __func__);
return -1;
}
write(fd, &enable, sizeof(enable));
close(fd);
handlers->activated = 0;
return 0;
}
int gp2a_proximity_set_delay(struct piranha_sensors_handlers *handlers, int64_t delay)
{
struct gp2a_proximity_data *data;
char *value = NULL;
int c;
int fd;
// LOGD("%s(%p, %ld)", __func__, handlers, (long int) delay);
if (handlers == NULL || handlers->data == NULL)
return -EINVAL;
return 0;
}
float gp2a_proximity_proximity(int value)
{
return (float) value * 5.0f;
}
int gp2a_proximity_get_data(struct piranha_sensors_handlers *handlers,
struct sensors_event_t *event)
{
struct input_event input_event;
int input_fd;
int rc;
if (handlers == NULL || event == NULL)
return -EINVAL;
input_fd = handlers->poll_fd;
if (input_fd < 0)
return -EINVAL;
rc = read(input_fd, &input_event, sizeof(input_event));
if (rc < (int) sizeof(input_event))
return -EINVAL;
if (input_event.type != EV_ABS || input_event.code != ABS_DISTANCE)
return -1;
event->version = sizeof(struct sensors_event_t);
event->sensor = handlers->handle;
event->type = handlers->handle;
event->timestamp = input_timestamp(&input_event);
event->distance = gp2a_proximity_proximity(input_event.value);
return 0;
}
struct piranha_sensors_handlers gp2a_proximity = {
.name = "GP2A Proximity",
.handle = SENSOR_TYPE_PROXIMITY,
.init = gp2a_proximity_init,
.deinit = gp2a_proximity_deinit,
.activate = gp2a_proximity_activate,
.deactivate = gp2a_proximity_deactivate,
.set_delay = gp2a_proximity_set_delay,
.get_data = gp2a_proximity_get_data,
.activated = 0,
.poll_fd = -1,
.data = NULL,
};
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