/*
* Copyright (C) 2015 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 DEBUG 0
#include <cutils/log.h>
#include <malloc.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 LCD_FILE = "/sys/class/leds/lcd-backlight/brightness";
char const *const RED_LED_FILE = "/sys/class/leds/red/brightness";
char const *const GREEN_LED_FILE = "/sys/class/leds/green/brightness";
char const *const BLUE_LED_FILE = "/sys/class/leds/blue/brightness";
char const *const RED_TIMEOUT_FILE = "/sys/class/leds/red/on_off_ms";
char const *const GREEN_TIMEOUT_FILE = "/sys/class/leds/green/on_off_ms";
char const *const BLUE_TIMEOUT_FILE = "/sys/class/leds/blue/on_off_ms";
char const *const RGB_LOCKED_FILE = "/sys/class/leds/red/rgb_start";
/**
* device methods
*/
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 = 0;
fd = open(path, O_RDWR);
if (fd >= 0) {
char buffer[32] = {0,};
int bytes = snprintf(buffer, sizeof(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 write_on_off(char const* path, int on, int off)
{
int fd;
static int already_warned = 0;
fd = open(path, O_RDWR);
if (fd >= 0) {
char buffer[32] = {0,};
int bytes = snprintf(buffer, sizeof(buffer), "%d %d\n", on, off);
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 __unused,
struct light_state_t const* state)
{
int err = 0;
int brightness = rgb_to_brightness(state);
pthread_mutex_lock(&g_lock);
err = write_int(LCD_FILE, brightness);
pthread_mutex_unlock(&g_lock);
return err;
}
static int set_light_locked(struct light_state_t const* state, int type __unused)
{
int len;
int red, green, blue;
int onMS, offMS;
unsigned int colorRGB;
switch (state->flashMode) {
case LIGHT_FLASH_TIMED:
case LIGHT_FLASH_HARDWARE:
onMS = state->flashOnMS;
offMS = state->flashOffMS;
break;
case LIGHT_FLASH_NONE:
default:
onMS = 0;
offMS = 0;
break;
}
colorRGB = state->color;
#if DEBUG
ALOGD("set_light_locked mode %d, colorRGB=%08X, onMS=%d, offMS=%d\n",
state->flashMode, colorRGB, onMS, offMS);
#endif
red = (colorRGB >> 16) & 0xFF;
green = (colorRGB >> 8) & 0xFF;
blue = colorRGB & 0xFF;
// due to limitation of driver
if (onMS == 0) {
red = 0;
green = 0;
blue = 0;
}
write_int(RGB_LOCKED_FILE, 0);
write_int(RED_LED_FILE, red);
write_int(GREEN_LED_FILE, green);
write_int(BLUE_LED_FILE, blue);
write_on_off(RED_TIMEOUT_FILE, onMS, offMS);
write_on_off(GREEN_TIMEOUT_FILE, onMS, offMS);
write_on_off(BLUE_TIMEOUT_FILE, onMS, offMS);
write_int(RGB_LOCKED_FILE, 1);
return 0;
}
static int set_light_notifications(struct light_device_t* dev __unused,
struct light_state_t const* state)
{
pthread_mutex_lock(&g_lock);
set_light_locked(state, 0);
pthread_mutex_unlock(&g_lock);
return 0;
}
static int set_light_attention(struct light_device_t* dev __unused,
struct light_state_t const* state)
{
pthread_mutex_lock(&g_lock);
set_light_locked(state, 1);
pthread_mutex_unlock(&g_lock);
return 0;
}
/** Close the lights device */
static int close_lights(struct light_device_t *dev)
{
if (dev)
free(dev);
return 0;
}
/******************************************************************************/
/**
* module methods
*/
/** 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)
{
int (*set_light)(struct light_device_t* dev,
struct light_state_t const* state);
if (!strcmp(LIGHT_ID_BACKLIGHT, name))
set_light = set_light_backlight;
else if (!strcmp(LIGHT_ID_NOTIFICATIONS, name))
set_light = set_light_notifications;
else if (!strcmp(LIGHT_ID_ATTENTION, name))
set_light = set_light_attention;
else
return -EINVAL;
pthread_once(&g_init, init_globals);
struct light_device_t *dev = malloc(sizeof(struct light_device_t));
if(!dev)
return -ENOMEM;
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,
};
/*
* The lights 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 = "Google, Inc.",
.methods = &lights_module_methods,
};