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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.
*/
#define LOG_TAG "lights"
#include <cutils/log.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <hardware/lights.h>
/******************************************************************************/
static pthread_once_t g_init = PTHREAD_ONCE_INIT;
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
char const *const LCD7_FILE
= "/sys/class/backlight/pwm-backlight/brightness";
char const *const LCD3_FILE
= "/sys/class/backlight/tps65217-bl/brightness";
char const *const LCD4_FILE
= "/sys/class/backlight/backlight.10/brightness";
void init_globals(void)
{
/* init the mutex */
pthread_mutex_init(&g_lock, NULL);
}
static int
write_int(char const *path, int value)
{
int fd;
static int already_warned;
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 == 0) {
ALOGE("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);
/* change 0-255 scale to 0-100 */
brightness = ((brightness/255.0)*100);
pthread_mutex_lock(&g_lock);
/* Try to write to LCD4 Backlight node */
err = write_int(LCD4_FILE, brightness);
if (err != 0) {
/* Try to write to LCD7 Backlight node */
err = write_int(LCD7_FILE, brightness);
/* LCD7 Backlight node not available, Try to write to LCD3 Backlight node */
if (err != 0) {
err = write_int(LCD3_FILE, brightness);
if (err != 0) {
/* LCD3 and LCD7 Backlight node not available */
ALOGI("write_int failed to open \n\t %s, %s and %s\n",
LCD4_FILE, LCD7_FILE, LCD3_FILE);
}
}
}
pthread_mutex_unlock(&g_lock);
return err;
}
static int
close_lights(struct light_device_t *dev)
{
if (dev)
free(dev);
return 0;
}
/******************************************************************************/
static int open_lights(const struct hw_module_t *module, char const *name,
struct hw_device_t **device)
{
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_once(&g_init, init_globals);
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_module_methods = {
.open = open_lights,
};
struct hw_module_t HAL_MODULE_INFO_SYM = {
.tag = HARDWARE_MODULE_TAG,
.version_major = 1,
.version_minor = 0,
.id = LIGHTS_HARDWARE_MODULE_ID,
.name = "TI OMAP lights Module",
.author = "Google, Inc.",
.methods = &lights_module_methods,
};