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/*
* Copyright (C) 2013 Paul Kocialkowski <contact@paulk.fr>
*
* 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 <sys/types.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 bh1721_data {
char path_enable[PATH_MAX];
char path_delay[PATH_MAX];
};
int bh1721_init(struct piranha_sensors_handlers *handlers,
struct piranha_sensors_device *device)
{
struct bh1721_data *data = NULL;
char path[PATH_MAX] = { 0 };
int input_fd = -1;
int rc;
ALOGD("%s(%p, %p)", __func__, handlers, device);
if (handlers == NULL)
return -EINVAL;
data = (struct bh1721_data *) calloc(1, sizeof(struct bh1721_data));
input_fd = input_open("light_sensor");
if (input_fd < 0) {
ALOGE("%s: Unable to open input", __func__);
goto error;
}
rc = sysfs_path_prefix("light_sensor", (char *) &path);
if (rc < 0 || path[0] == '\0') {
ALOGE("%s: Unable to open sysfs", __func__);
goto error;
}
snprintf(data->path_enable, PATH_MAX, "%s/enable", path);
snprintf(data->path_delay, PATH_MAX, "%s/poll_delay", path);
handlers->poll_fd = input_fd;
handlers->data = (void *) data;
return 0;
error:
if (data != NULL)
free(data);
if (input_fd >= 0)
close(input_fd);
handlers->poll_fd = -1;
handlers->data = NULL;
return -1;
}
int bh1721_deinit(struct piranha_sensors_handlers *handlers)
{
ALOGD("%s(%p)", __func__, handlers);
if (handlers == NULL)
return -EINVAL;
if (handlers->poll_fd >= 0)
close(handlers->poll_fd);
handlers->poll_fd = -1;
if (handlers->data != NULL)
free(handlers->data);
handlers->data = NULL;
return 0;
}
int bh1721_activate(struct piranha_sensors_handlers *handlers)
{
struct bh1721_data *data;
int rc;
ALOGD("%s(%p)", __func__, handlers);
if (handlers == NULL || handlers->data == NULL)
return -EINVAL;
data = (struct bh1721_data *) handlers->data;
rc = sysfs_value_write(data->path_enable, 1);
if (rc < 0) {
ALOGE("%s: Unable to write sysfs value", __func__);
return -1;
}
handlers->activated = 1;
return 0;
}
int bh1721_deactivate(struct piranha_sensors_handlers *handlers)
{
struct bh1721_data *data;
int rc;
ALOGD("%s(%p)", __func__, handlers);
if (handlers == NULL || handlers->data == NULL)
return -EINVAL;
data = (struct bh1721_data *) handlers->data;
rc = sysfs_value_write(data->path_enable, 0);
if (rc < 0) {
ALOGE("%s: Unable to write sysfs value", __func__);
return -1;
}
handlers->activated = 1;
return 0;
}
int bh1721_set_delay(struct piranha_sensors_handlers *handlers, long int delay)
{
struct bh1721_data *data;
int rc;
ALOGD("%s(%p, %ld)", __func__, handlers, delay);
if (handlers == NULL || handlers->data == NULL)
return -EINVAL;
data = (struct bh1721_data *) handlers->data;
rc = sysfs_value_write(data->path_delay, (int) delay);
if (rc < 0) {
ALOGE("%s: Unable to write sysfs value", __func__);
return -1;
}
return 0;
}
float bh1721_convert(int value)
{
return value * 0.712f;
}
int bh1721_get_data(struct piranha_sensors_handlers *handlers,
struct sensors_event_t *event)
{
struct input_event input_event;
int input_fd;
int rc;
// ALOGD("%s(%p, %p)", __func__, handlers, event);
if (handlers == NULL || event == NULL)
return -EINVAL;
input_fd = handlers->poll_fd;
if (input_fd < 0)
return -EINVAL;
memset(event, 0, sizeof(struct sensors_event_t));
event->version = sizeof(struct sensors_event_t);
event->sensor = handlers->handle;
event->type = handlers->handle;
do {
rc = read(input_fd, &input_event, sizeof(input_event));
if (rc < (int) sizeof(input_event))
break;
if (input_event.type == EV_REL) {
if (input_event.code == REL_MISC)
event->light = bh1721_convert(input_event.value);
} else if (input_event.type == EV_SYN) {
if (input_event.code == SYN_REPORT)
event->timestamp = input_timestamp(&input_event);
}
} while (input_event.type != EV_SYN);
return 0;
}
struct piranha_sensors_handlers bh1721 = {
.name = "BH1721",
.handle = SENSOR_TYPE_LIGHT,
.init = bh1721_init,
.deinit = bh1721_deinit,
.activate = bh1721_activate,
.deactivate = bh1721_deactivate,
.set_delay = bh1721_set_delay,
.get_data = bh1721_get_data,
.activated = 0,
.needed = 0,
.poll_fd = -1,
.data = NULL,
};
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