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/*
* Copyright (C) 2012 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"
#define LOGE ALOGE
#include <cutils/log.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <hardware/lights.h>
#include <hardware/hardware.h>
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
static int write_int(char const *path, int value)
{
int fd;
static int already_warned = -1;
fd = open(path, O_RDWR);
if (fd >= 0) {
char buffer[20];
int bytes = sprintf(buffer, "%d\n", value);
int amt = write(fd, buffer, bytes);
close(fd);
return amt == -1 ? -errno : 0;
} else {
if (already_warned == -1) {
LOGE("write_int failed to open %s\n", path);
already_warned = 1;
}
return -errno;
}
}
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 set_light_backlight(struct light_device_t *dev,
struct light_state_t const *state)
{
int err = 0;
int brightness = rgb_to_brightness(state);
//+++ power save
int range_num = 1;
int old_brightness_range_indexs[] = {160,255};
int new_brightness_range_indexs[] = {160,182};
int old_brightness = brightness;
int i=0;
int old_brightness_in_range = -1;// 0:1~10 , 1:10~102 , 2:102~255
for(i=0;i<range_num;i++){
int t_range_min = old_brightness_range_indexs[i];
int t_range_max = old_brightness_range_indexs[i+1];
if( brightness>=t_range_min && brightness<=t_range_max){
old_brightness_in_range = i;
break;
}
}
if(old_brightness_in_range>=0){
int old_br_min = old_brightness_range_indexs[old_brightness_in_range];
int olb_br_max = old_brightness_range_indexs[old_brightness_in_range+1];
int new_br_min = new_brightness_range_indexs[old_brightness_in_range];
int new_br_max = new_brightness_range_indexs[old_brightness_in_range+1];
int new_brightness = new_br_min +
(new_br_max-new_br_min)*(old_brightness-old_br_min)/(olb_br_max-old_br_min);
brightness = new_brightness;
}
//---
pthread_mutex_lock(&g_lock);
err = write_int("/sys/class/backlight/pwm-backlight/brightness",
brightness);
pthread_mutex_unlock(&g_lock);
return err;
}
/** Close the lights device */
static int close_lights(struct light_device_t *dev)
{
if (dev)
free(dev);
return 0;
}
/** Open a new instance of a lights device using name */
static int open_lights(const struct hw_module_t *module, char const *name,
struct hw_device_t **device)
{
pthread_t lighting_poll_thread;
int (*set_light) (struct light_device_t *dev,
struct light_state_t const *state);
if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
set_light = set_light_backlight;
else
return -EINVAL;
pthread_mutex_init(&g_lock, NULL);
struct light_device_t *dev = malloc(sizeof(struct light_device_t));
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 *))close_lights;
dev->set_light = set_light;
*device = (struct hw_device_t *)dev;
return 0;
}
static struct hw_module_methods_t lights_methods =
{
.open = open_lights,
};
/*
* The backlight Module
*/
struct hw_module_t HAL_MODULE_INFO_SYM =
{
.tag = HARDWARE_MODULE_TAG,
.version_major = 1,
.version_minor = 0,
.id = LIGHTS_HARDWARE_MODULE_ID,
.name = "NVIDIA Kai lights module",
.author = "NVIDIA",
.methods = &lights_methods,
};
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