/*
* 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;
static int g_haveTrackballLight = 0;
static struct light_state_t g_notification;
static struct light_state_t g_battery;
static int g_backlight = 255;
static int g_trackball = -1;
static int g_buttons = 0;
static int g_attention = 0;
char const*const TRACKBALL_FILE
= "/sys/class/leds/jogball-backlight/brightness";
/**
* device methods
*/
void init_globals(void)
{
// init the mutex
pthread_mutex_init(&g_lock, NULL);
// figure out if we have the trackball LED or not
g_haveTrackballLight = (access(TRACKBALL_FILE, W_OK) == 0) ? 1 : 0;
}
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
handle_trackball_light_locked(struct light_device_t* dev)
{
int mode = 0;
if (g_attention > 127) {
mode = 3;
}
else if (!g_backlight && g_attention <= 127 && g_attention > 0) {
mode = 7;
}
// If the value isn't changing, don't set it, because this
// can reset the timer on the breathing mode, which looks bad.
if (g_trackball == mode) {
return 0;
}
return write_int(TRACKBALL_FILE, mode);
}
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);
pthread_mutex_lock(&g_lock);
g_backlight = brightness;
err = write_int("/sys/class/leds/lcd-backlight/brightness", brightness);
if (g_haveTrackballLight) {
handle_trackball_light_locked(dev);
}
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("/sys/class/leds/keyboard-backlight/brightness", 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);
g_buttons = on;
err = write_int("/sys/class/leds/button-backlight/brightness", on?255:0);
pthread_mutex_unlock(&g_lock);
return err;
}
static int
set_speaker_light_locked(struct light_device_t* dev,
struct light_state_t const* state)
{
int len;
int alpha, red, green, blue;
int blink, freq, pwm;
int onMS, offMS;
unsigned int colorRGB;
switch (state->flashMode) {
case LIGHT_FLASH_TIMED:
onMS = state->flashOnMS;
offMS = state->flashOffMS;
break;
case LIGHT_FLASH_NONE:
default:
onMS = 0;
offMS = 0;
break;
}
colorRGB = state->color;
#if 0
LOGD("set_led_state colorRGB=%08X, onMS=%d, offMS=%d\n",
colorRGB, onMS, offMS);
#endif
red = (colorRGB >> 16) & 0xFF;
green = (colorRGB >> 8) & 0xFF;
blue = colorRGB & 0xFF;
write_int("/sys/class/leds/red/brightness", red);
write_int("/sys/class/leds/green/brightness", green);
write_int("/sys/class/leds/blue/brightness", blue);
if (onMS > 0 && offMS > 0) {
int totalMS = onMS + offMS;
// the LED appears to blink about once per second if freq is 20
// 1000ms / 20 = 50
freq = totalMS / 50;
// pwm specifies the ratio of ON versus OFF
// pwm = 0 -> always off
// pwm = 255 => always on
pwm = (onMS * 255) / totalMS;
// the low 4 bits are ignored, so round up if necessary
if (pwm > 0 && pwm < 16)
pwm = 16;
blink = 1;
} else {
blink = 0;
freq = 0;
pwm = 0;
}
if (blink) {
write_int("/sys/class/leds/red/device/grpfreq", freq);
write_int("/sys/class/leds/red/device/grppwm", pwm);
}
write_int("/sys/class/leds/red/device/blink", blink);
return 0;
}
static void
handle_speaker_battery_locked(struct light_device_t* dev)
{
if (is_lit(&g_battery)) {
set_speaker_light_locked(dev, &g_battery);
} else {
set_speaker_light_locked(dev, &g_notification);
}
}
static int
set_light_battery(struct light_device_t* dev,
struct light_state_t const* state)
{
pthread_mutex_lock(&g_lock);
g_battery = *state;
if (g_haveTrackballLight) {
set_speaker_light_locked(dev, state);
}
handle_speaker_battery_locked(dev);
pthread_mutex_unlock(&g_lock);
return 0;
}
static int
set_light_notifications(struct light_device_t* dev,
struct light_state_t const* state)
{
pthread_mutex_lock(&g_lock);
g_notification = *state;
LOGV("set_light_notifications g_trackball=%d color=0x%08x",
g_trackball, state->color);
if (g_haveTrackballLight) {
handle_trackball_light_locked(dev);
}
handle_speaker_battery_locked(dev);
pthread_mutex_unlock(&g_lock);
return 0;
}
static int
set_light_attention(struct light_device_t* dev,
struct light_state_t const* state)
{
pthread_mutex_lock(&g_lock);
g_notification = *state;
LOGV("set_light_attention g_trackball=%d color=0x%08x",
g_trackball, state->color);
g_attention = rgb_to_brightness(state);
if (g_haveTrackballLight) {
handle_trackball_light_locked(dev);
}
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 (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_notifications;
}
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,
};
/*
* The lights Module
*/
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 = "QCT MSM7K lights Module",
.author = "Google, Inc.",
.methods = &lights_module_methods,
};