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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>
// taken from led-lm3530.h in kernel source, these are als modes
#define MANUAL 0
#define AUTOMATIC 1
#define MANUAL_SENSOR 2
/******************************************************************************/
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 ALS_FILE
= "/sys/class/leds/lcd-backlight/als";
char const*const KEYBOARD_FILE
= "/sys/class/leds/keyboard-backlight/brightness";
char const*const BUTTON_FILE
= "/sys/class/leds/button-backlight/brightness";
/*RGB file descriptors */
char const*const RED_LED_FILE
= "/sys/class/leds/red/brightness";
char const*const RED_BLINK_FILE
= "/sys/class/leds/red/blink";
char const*const GREEN_LED_FILE
= "/sys/class/leds/green/brightness";
char const*const BLUE_LED_FILE
= "/sys/class/leds/blue/brightness";
static unsigned int colorstate = 0;
static int blinkstate = 0;
static unsigned int lastnotificationcolor = 0;
static int lastnotificationblink = 0;
static int lowbattery = 0;
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[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) {
LOGE("write_int failed to open %s\n", path);
already_warned = 1;
}
return -errno;
}
}
static int
is_lit(struct light_state_t const* state)
{
return state->color & 0x00ffffff;
}
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 als_mode;
int brightness = rgb_to_brightness(state);
switch(state->brightnessMode) {
case BRIGHTNESS_MODE_SENSOR:
als_mode = AUTOMATIC;
break;
case BRIGHTNESS_MODE_USER:
default:
als_mode = MANUAL_SENSOR;
break;
}
pthread_mutex_lock(&g_lock);
err = write_int(ALS_FILE, als_mode);
err = write_int(LCD_FILE, brightness);
pthread_mutex_unlock(&g_lock);
return err;
}
static int
set_light_keyboard(struct light_device_t* dev,
struct light_state_t const* state)
{
int err = 0;
int on = is_lit(state);
pthread_mutex_lock(&g_lock);
err = write_int(KEYBOARD_FILE, on ? 255:0);
pthread_mutex_unlock(&g_lock);
return err;
}
static int
set_light_buttons(struct light_device_t* dev,
struct light_state_t const* state)
{
int err = 0;
int on = is_lit(state);
pthread_mutex_lock(&g_lock);
err = write_int(BUTTON_FILE, on ? 255:0);
pthread_mutex_unlock(&g_lock);
return err;
}
static int
set_light_locked(unsigned int color, int blink)
{
int err = 0;
int red, green, blue;
if(colorstate == color &&
blinkstate == blink) {
// don't bother changing if we don't have to
return 0;
} else {
colorstate = color;
blinkstate = blink;
}
red = (color >> 16) & 0xFF;
green = (color >> 8) & 0xFF;
blue = color & 0xFF;
// ensure blinking is off
err = write_int(RED_BLINK_FILE, 0);
// set colors
err = write_int(RED_LED_FILE, red);
err = write_int(GREEN_LED_FILE, green);
err = write_int(BLUE_LED_FILE, blue);
// blink if supposed to
if (blink) {
err = write_int(RED_BLINK_FILE, 255);
}
return err;
}
static int
set_light_battery(struct light_device_t* dev,
struct light_state_t const* state)
{
int err = 0;
int blink;
switch (state->flashMode) {
case LIGHT_FLASH_HARDWARE:
case LIGHT_FLASH_TIMED:
blink = 1;
break;
case LIGHT_FLASH_NONE:
default:
blink = 0;
break;
}
#if 0
LOGD("set_light_battery color=%08X, blink=%d****************\n",
state->color, blink);
#endif
if (state->color == 0xffff0000) {
lowbattery = 1;
err = set_light_locked(state->color, blink);
} else if (lowbattery == 1) {
lowbattery = 0;
err = set_light_locked(lastnotificationcolor, lastnotificationblink);
}
return err;
}
static int
set_light_notification(struct light_device_t* dev,
struct light_state_t const* state)
{
int err = 0;
int blink;
switch (state->flashMode) {
case LIGHT_FLASH_HARDWARE:
case LIGHT_FLASH_TIMED:
blink = 1;
break;
case LIGHT_FLASH_NONE:
default:
blink = 0;
break;
}
#if 0
LOGD("set_light_notification color=%08X, blink=%d****************\n",
state->color, blink);
#endif
lastnotificationcolor = state->color;
lastnotificationblink = blink;
if (lowbattery == 0) {
err = set_light_locked(state->color, blink);
}
return err;
}
static int
set_light_attention(struct light_device_t* dev,
struct light_state_t const* state)
{
int err = 0;
/**
* we don't have a defined attention light, so ignore these
*
int blink;
switch (state->flashMode) {
case LIGHT_FLASH_HARDWARE:
case LIGHT_FLASH_TIMED:
blink = 1;
break;
case LIGHT_FLASH_NONE:
default:
blink = 0;
break;
}
LOGD("set_light_attention color=%08X, blink=%d****************\n",
state->color, blink);
err = set_light_locked(state->color, blink);
*
*/
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 if (0 == strcmp(LIGHT_ID_KEYBOARD, name)) {
set_light = set_light_keyboard;
}
else if (0 == strcmp(LIGHT_ID_BUTTONS, name)) {
set_light = set_light_buttons;
}
else if (0 == strcmp(LIGHT_ID_BATTERY, name)) {
set_light = set_light_battery;
}
else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name)) {
set_light = set_light_notification;
}
else if (0 == 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));
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,
};
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 = "TI OMAP lights Module",
.author = "Google, Inc.",
.methods = &lights_module_methods,
};
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