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/*
* Copyright (C) 2012 The CyanogenMod 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 <sys/ioctl.h>
#include <sys/types.h>
#include <hardware/lights.h>
#include <hardware/hardware.h>
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
/** Paths to light files **/
char const *const BACKLIGHT_FILE = "/sys/class/backlight/panel/brightness";
char const *const BUTTON_FILE = "/sys/class/sec/sec_touchkey/brightness";
char const *const NOTIFICATION_FILE = "/sys/class/misc/backlightnotification/notification_led";
/** Write integer to file **/
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) {
ALOGE("write_int failed to open %s\n", path);
already_warned = 1;
}
return -errno;
}
}
/** Convert RGB to 0-255 integer **/
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;
}
/** Is light already enabled? **/
static int is_lit(struct light_state_t const* state)
{
return state->color & 0x00ffffff;
}
/** Set LCD backlight **/
static int set_light_backlight(struct light_device_t *dev, struct light_state_t const *state)
{
pthread_mutex_lock(&g_lock);
int err = write_int(BACKLIGHT_FILE, rgb_to_brightness(state));
pthread_mutex_unlock(&g_lock);
return err;
}
/** Set buttons backlight **/
static int set_light_buttons(struct light_device_t* dev, struct light_state_t const* state)
{
int err = 0;
pthread_mutex_lock (&g_lock);
if(is_lit(state))
err = write_int(BUTTON_FILE, 1);
else
err = write_int(BUTTON_FILE, 0);
pthread_mutex_unlock (&g_lock);
return err;
}
/** Set buttons backlight as BLN **/
static int set_light_notifications(struct light_device_t* dev, struct light_state_t const* state)
{
int err = 0;
pthread_mutex_lock (&g_lock);
if(is_lit(state))
err = write_int(NOTIFICATION_FILE, 1);
else
err = write_int(NOTIFICATION_FILE, 0);
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 if (0 == strcmp(LIGHT_ID_BUTTONS, name))
set_light = set_light_buttons;
else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
set_light = set_light_notifications;
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;
}
/** Method list **/
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 = "Lights module",
.author = "The CyanogenMod Project",
.methods = &lights_methods,
};