blob: 9dabafe91a4723aa88b733ac00552aad1678b262 [file] [log] [blame]
/*
* Copyright (C) 2014, 2017-2018, 2020-2021, The Linux Foundation.
* All rights reserved.
* Not a contribution
* 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_NDEBUG 0
#include <log/log.h>
#include <cutils/properties.h>
#include <stdint.h>
#include <stdlib.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>
#ifndef DEFAULT_LOW_PERSISTENCE_MODE_BRIGHTNESS
#define DEFAULT_LOW_PERSISTENCE_MODE_BRIGHTNESS 0x80
#endif
/******************************************************************************/
static pthread_once_t g_init = PTHREAD_ONCE_INIT;
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
static struct light_state_t g_notification;
static struct light_state_t g_battery;
static int g_last_backlight_mode = BRIGHTNESS_MODE_USER;
static int g_attention = 0;
static bool g_has_persistence_node = false;
char const*const LCD_FILE
= "/sys/class/leds/lcd-backlight/brightness";
char const*const LCD_FILE2
= "/sys/class/backlight/panel0-backlight/brightness";
char const*const BUTTON_FILE
= "/sys/class/leds/button-backlight/brightness";
char const*const PERSISTENCE_FILE
= "/sys/class/graphics/fb0/msm_fb_persist_mode";
enum rgb_led {
LED_RED = 0,
LED_GREEN,
LED_BLUE,
};
char *led_names[] = {
"red",
"green",
"blue",
};
/**
* device methods
*/
void init_globals(void)
{
// init the mutex
pthread_mutex_init(&g_lock, NULL);
}
static int write_str(char const* path, char const* str)
{
int fd;
fd = open(path, O_RDWR);
if (fd >= 0) {
ssize_t amt = write(fd, str, strlen(str));
close(fd);
return amt == -1 ? -errno : 0;
}
ALOGE("write_str failed to open %s, errno = %d\n", path, errno);
return -errno;
}
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 = snprintf(buffer, sizeof(buffer), "%d\n", value);
ssize_t amt = write(fd, buffer, (size_t)bytes);
close(fd);
return amt == -1 ? -errno : 0;
} else {
if (already_warned == 0) {
ALOGE("write_int failed to open %s, errno = %d\n", path, errno);
already_warned = 1;
}
return -errno;
}
}
static bool file_exists(const char *file)
{
int fd;
fd = open(file, O_RDWR);
if (fd < 0) {
ALOGE("failed to open %s, errno=%d\n", file, errno);
return false;
}
close(fd);
return true;
}
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 brightness = rgb_to_brightness(state);
unsigned int lpEnabled =
state->brightnessMode == BRIGHTNESS_MODE_LOW_PERSISTENCE;
if(!dev) {
return -1;
}
pthread_mutex_lock(&g_lock);
// Toggle low persistence mode state
bool persistence_mode = ((g_last_backlight_mode != state->brightnessMode && lpEnabled) ||
(!lpEnabled &&
g_last_backlight_mode == BRIGHTNESS_MODE_LOW_PERSISTENCE));
bool cannot_handle_persistence = !g_has_persistence_node && persistence_mode;
if (g_has_persistence_node) {
if (persistence_mode) {
if ((err = write_int(PERSISTENCE_FILE, lpEnabled)) != 0) {
ALOGE("%s: Failed to write to %s: %s\n", __FUNCTION__,
PERSISTENCE_FILE, strerror(errno));
}
if (lpEnabled != 0) {
brightness = DEFAULT_LOW_PERSISTENCE_MODE_BRIGHTNESS;
}
}
g_last_backlight_mode = state->brightnessMode;
}
if (!err) {
if (!access(LCD_FILE, F_OK)) {
err = write_int(LCD_FILE, brightness);
} else {
err = write_int(LCD_FILE2, brightness);
}
}
pthread_mutex_unlock(&g_lock);
return cannot_handle_persistence ? -ENOSYS : err;
}
static int set_rgb_led_brightness(enum rgb_led led, int brightness)
{
char file[48];
int rc;
snprintf(file, sizeof(file), "/sys/class/leds/%s/trigger", led_names[led]);
rc = write_str(file, "none");
if (rc < 0) {
ALOGD("%s failed to set trigger to none\n", led_names[led]);
return rc;
}
snprintf(file, sizeof(file), "/sys/class/leds/%s/brightness", led_names[led]);
rc = write_int(file, brightness);
if (rc < 0)
return rc;
return rc;
}
static int set_rgb_led_timer_trigger(enum rgb_led led, int onMS, int offMS)
{
char file_on[48];
char file_off[48];
int rc;
int retries = 20;
snprintf(file_on, sizeof(file_on), "/sys/class/leds/%s/trigger", led_names[led]);
rc = write_str(file_on, "timer");
if (rc < 0) {
ALOGD("%s doesn't support timer trigger\n", led_names[led]);
return rc;
}
snprintf(file_off, sizeof(file_off), "/sys/class/leds/%s/delay_off", led_names[led]);
snprintf(file_on, sizeof(file_on), "/sys/class/leds/%s/delay_on", led_names[led]);
while(retries--) {
ALOGD("retry %d set delay_off and delay_on\n", retries);
usleep(2000);
rc = write_int(file_off, offMS);
if (rc < 0)
continue;
rc = write_int(file_on, onMS);
if (!rc)
break;
}
if (rc < 0) {
ALOGE("Error in writing to delay_on/off for %s\n", led_names[led]);
return rc;
}
return 0;
}
static int set_rgb_led_hw_blink(enum rgb_led led, int blink)
{
char file[48];
snprintf(file, sizeof(file), "/sys/class/leds/%s/breath", led_names[led]);
if (!file_exists(file))
return -1;
return write_int(file, blink);
}
static int
set_speaker_light_locked(struct light_device_t* dev,
struct light_state_t const* state)
{
int red, green, blue;
int onMS, offMS;
unsigned int colorRGB;
int blink = 0;
int rc = 0;
if(!dev) {
return -1;
}
colorRGB = state->color;
red = (colorRGB >> 16) & 0xFF;
green = (colorRGB >> 8) & 0xFF;
blue = colorRGB & 0xFF;
onMS = state->flashOnMS;
offMS = state->flashOffMS;
if (onMS != 0 && offMS != 0)
blink = 1;
switch (state->flashMode) {
case LIGHT_FLASH_HARDWARE:
if (!!red)
rc = set_rgb_led_hw_blink(LED_RED, blink);
if (!!green)
rc |= set_rgb_led_hw_blink(LED_GREEN, blink);
if (!!blue)
rc |= set_rgb_led_hw_blink(LED_BLUE, blink);
/* fallback to timed blinking if breath is not supported */
if (rc == 0)
break;
case LIGHT_FLASH_TIMED:
if (!!red)
rc = set_rgb_led_timer_trigger(LED_RED, onMS, offMS);
if (!!green)
rc |= set_rgb_led_timer_trigger(LED_GREEN, onMS, offMS);
if (!!blue)
rc |= set_rgb_led_timer_trigger(LED_BLUE, onMS, offMS);
/* fallback to constant on if timed blinking is not supported */
if (rc == 0)
break;
case LIGHT_FLASH_NONE:
default:
rc = set_rgb_led_brightness(LED_RED, red);
rc |= set_rgb_led_brightness(LED_GREEN, green);
rc |= set_rgb_led_brightness(LED_BLUE, blue);
break;
}
ALOGD("set_speaker_light_locked mode=%d, colorRGB=%08X, onMS=%d, offMS=%d, rc=%d\n",
state->flashMode, colorRGB, onMS, offMS, rc);
return rc;
}
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;
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;
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);
if (state->flashMode == LIGHT_FLASH_HARDWARE) {
g_attention = state->flashOnMS;
} else if (state->flashMode == LIGHT_FLASH_NONE) {
g_attention = 0;
}
handle_speaker_battery_locked(dev);
pthread_mutex_unlock(&g_lock);
return 0;
}
static int
set_light_buttons(struct light_device_t* dev,
struct light_state_t const* state)
{
int err = 0;
if(!dev) {
return -1;
}
pthread_mutex_lock(&g_lock);
err = write_int(BUTTON_FILE, state->color & 0xFF);
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;
}
/******************************************************************************/
/**
* 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)) {
g_has_persistence_node = !access(PERSISTENCE_FILE, F_OK);
set_light = set_light_backlight;
} 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_BUTTONS, name)) {
if (!access(BUTTON_FILE, F_OK)) {
// enable light button when the file is present
set_light = set_light_buttons;
} else {
return -EINVAL;
}
}
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));
if(!dev)
return -ENOMEM;
memset(dev, 0, sizeof(*dev));
dev->common.tag = HARDWARE_DEVICE_TAG;
dev->common.version = LIGHTS_DEVICE_API_VERSION_2_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,
};