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/*
* Copyright (C) 2012 Renesas Solutions Corp.
* 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.
*/
#define LOG_TAG "lights"
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdint.h>
#include <string.h>
#include <cutils/log.h>
#include <hardware/lights.h>
#include <sys/ioctl.h>
#include <sys/types.h>
static pthread_once_t g_init = PTHREAD_ONCE_INIT;
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
static char const * const BACKLIGHT_FILE =
"/sys/class/backlight/pwm-backlight.0/brightness";
static int file_write_integer(char const *path, int value)
{
static int already_warned = 0;
char buffer[11];
int bytes;
int ret;
int fd;
LOGV("%s: path %s, value %d", __func__, path, value);
fd = open(path, O_RDWR);
if (fd < 0) {
if (!already_warned) {
LOGE("%s: failed to open %s\n", __func__, path);
already_warned = 1;
}
return -errno;
}
bytes = sprintf(buffer, "%d\n", value);
ret = write(fd, buffer, bytes);
close(fd);
return ret == -1 ? -errno : 0;
}
static int rgb_to_brightness(struct light_state_t const *state)
{
int color = state->color & 0x00ffffff;
return (77 * ((color >> 16) & 0x00ff) +
150 * ((color >> 8) & 0x00ff) +
29 * (color & 0x00ff)) >> 8;
}
static int light_set_backlight(struct light_device_t *dev,
struct light_state_t const *state)
{
int brightness = rgb_to_brightness(state);
int err;
pthread_mutex_lock(&g_lock);
err = file_write_integer(BACKLIGHT_FILE, brightness);
pthread_mutex_unlock(&g_lock);
return err;
}
static int light_close(struct light_device_t *dev)
{
free(dev);
return 0;
}
static int light_open(const struct hw_module_t *module, char const *name,
struct hw_device_t **device)
{
int (*set)(struct light_device_t *dev,
struct light_state_t const *state);
struct light_device_t *dev;
LOGV("%s: open with %s", __func__, name);
if (!strcmp(LIGHT_ID_BACKLIGHT, name))
set = light_set_backlight;
else
return -EINVAL;
pthread_mutex_init(&g_lock, NULL);
dev = malloc(sizeof(*dev));
memset(dev, 0, sizeof(*dev));
dev->common.tag = HARDWARE_DEVICE_TAG;
dev->common.version = 0;
dev->common.module = (struct hw_module_t *)module;
dev->common.close = (int (*)(struct hw_device_t *))light_close;
dev->set_light = set;
*device = (struct hw_device_t *)dev;
return 0;
}
static struct hw_module_methods_t lights_module_methods = {
.open = light_open,
};
const struct hw_module_t HAL_MODULE_INFO_SYM = {
.tag = HARDWARE_MODULE_TAG,
.version_major = 1,
.version_minor = 0,
.id = LIGHTS_HARDWARE_MODULE_ID,
.name = "Backlight Module",
.author = "Laurent Pinchart <laurent.pinchart@ideasonboard.com>",
.methods = &lights_module_methods,
};
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