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android_hardware_samsung/liblights/lights.c

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/*
* Copyright (C) 2013 The Android Open Source Project
* Copyright (C) 2015-2016 The CyanogenMod Project
* Copyright (C) 2017 The LineageOS 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 "SamsungLightsHAL"
/* #define LOG_NDEBUG 0 */
#include <cutils/log.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>
#include <liblights/samsung_lights_helper.h>
#include "samsung_lights.h"
#define COLOR_MASK 0x00ffffff
#define MAX_INPUT_BRIGHTNESS 255
enum component_mask_t {
COMPONENT_BACKLIGHT = 0x1,
COMPONENT_BUTTON_LIGHT = 0x2,
COMPONENT_LED = 0x4,
COMPONENT_BLN = 0x8,
};
enum light_t {
TYPE_BATTERY = 0,
TYPE_NOTIFICATION = 1,
TYPE_ATTENTION = 2,
};
// Assume backlight is always supported
static int hw_components = COMPONENT_BACKLIGHT;
static pthread_once_t g_init = PTHREAD_ONCE_INIT;
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
struct backlight_config {
int cur_brightness, max_brightness;
};
struct led_config {
unsigned int color;
int delay_on, delay_off;
};
static struct backlight_config g_backlight; // For panel backlight
static struct led_config g_leds[3]; // For battery, notifications, and attention.
static int g_cur_led = -1; // Presently showing LED of the above.
void check_component_support()
{
if (access(BUTTON_BRIGHTNESS_NODE, W_OK) == 0)
hw_components |= COMPONENT_BUTTON_LIGHT;
if (access(LED_BLINK_NODE, W_OK) == 0)
hw_components |= COMPONENT_LED;
#ifdef LED_BLN_NODE
if (access(LED_BLN_NODE, W_OK) == 0)
hw_components |= COMPONENT_BLN;
#endif
}
void init_g_lock(void)
{
pthread_mutex_init(&g_lock, NULL);
}
static int write_str(char const *path, const char* value)
{
int fd;
static int already_warned;
already_warned = 0;
ALOGV("write_str: path %s, value %s", path, value);
fd = open(path, O_RDWR);
if (fd >= 0) {
int amt = write(fd, value, strlen(value));
close(fd);
return amt == -1 ? -errno : 0;
} else {
if (already_warned == 0) {
ALOGE("write_str failed to open %s", path);
already_warned = 1;
}
return -errno;
}
}
static int rgb_to_brightness(struct light_state_t const *state)
{
int color = state->color & COLOR_MASK;
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);
int max_brightness = g_backlight.max_brightness;
/*
* If max panel brightness is not the default (255),
* apply linear scaling across the accepted range.
*/
if (max_brightness != MAX_INPUT_BRIGHTNESS) {
int old_brightness = brightness;
brightness = brightness * max_brightness / MAX_INPUT_BRIGHTNESS;
ALOGV("%s: scaling brightness %d => %d", __func__,
old_brightness, brightness);
}
pthread_mutex_lock(&g_lock);
err = set_cur_panel_brightness(brightness);
if (err == 0)
g_backlight.cur_brightness = brightness;
pthread_mutex_unlock(&g_lock);
return err;
}
static int set_light_buttons(struct light_device_t* dev __unused,
struct light_state_t const* state)
{
int err = 0;
pthread_mutex_lock(&g_lock);
int brightness = (state->color & COLOR_MASK) ? 1 : 0;
#ifdef VAR_BUTTON_BRIGHTNESS
brightness = rgb_to_brightness(state);
#endif
err = set_cur_button_brightness(brightness);
pthread_mutex_unlock(&g_lock);
return err;
}
static int close_lights(struct light_device_t *dev)
{
ALOGV("close_light is called");
if (dev)
free(dev);
return 0;
}
/* LEDs */
static int write_leds(const struct led_config *led)
{
static const struct led_config led_off = {0, 0, 0};
char blink[32];
int count, err;
if (led == NULL)
led = &led_off;
count = snprintf(blink,
sizeof(blink) - 1,
"0x%08x %d %d",
led->color,
led->delay_on,
led->delay_off);
if (count < 0) {
return -errno;
} else if ((unsigned int)count >= sizeof(blink)-1) {
ALOGE("%s: Truncated string: blink=\"%s\".", __func__, blink);
return -EINVAL;
}
ALOGV("%s: color=0x%08x, delay_on=%d, delay_off=%d, blink=%s",
__func__, led->color, led->delay_on, led->delay_off, blink);
/* Add '\n' here to make the above log message clean. */
blink[count] = '\n';
blink[count+1] = '\0';
pthread_mutex_lock(&g_lock);
err = write_str(LED_BLINK_NODE, blink);
pthread_mutex_unlock(&g_lock);
return err;
}
static int calibrate_color(int color, int brightness)
{
int red = ((color >> 16) & 0xFF) * LED_ADJUSTMENT_R;
int green = ((color >> 8) & 0xFF) * LED_ADJUSTMENT_G;
int blue = (color & 0xFF) * LED_ADJUSTMENT_B;
return (((red * brightness) / 255) << 16) + (((green * brightness) / 255) << 8) + ((blue * brightness) / 255);
}
static int set_light_leds(struct light_state_t const *state, int type)
{
struct led_config *led;
int err = 0;
int adjusted_brightness;
ALOGV("%s: type=%d, color=0x%010x, fM=%d, fOnMS=%d, fOffMs=%d.", __func__,
type, state->color,state->flashMode, state->flashOnMS, state->flashOffMS);
if (type < 0 || (size_t)type >= sizeof(g_leds)/sizeof(g_leds[0])) {
return -EINVAL;
}
/* type is one of:
* 0. battery
* 1. notifications
* 2. attention
* which are multiplexed onto the same physical LED in the above order. */
led = &g_leds[type];
switch (state->flashMode) {
case LIGHT_FLASH_NONE:
/* Set LED to a solid color, spec is unclear on the exact behavior here. */
led->delay_on = led->delay_off = 0;
break;
case LIGHT_FLASH_TIMED:
case LIGHT_FLASH_HARDWARE:
led->delay_on = state->flashOnMS;
led->delay_off = state->flashOffMS;
break;
default:
return -EINVAL;
}
switch (type) {
case TYPE_BATTERY:
adjusted_brightness = LED_BRIGHTNESS_BATTERY;
break;
case TYPE_NOTIFICATION:
adjusted_brightness = LED_BRIGHTNESS_NOTIFICATION;
break;
case TYPE_ATTENTION:
adjusted_brightness = LED_BRIGHTNESS_ATTENTION;
break;
default:
adjusted_brightness = 255;
}
led->color = calibrate_color(state->color & COLOR_MASK, adjusted_brightness);
if (led->color > 0) {
/* This LED is lit. */
if (type >= g_cur_led) {
/* And it has the highest priority, so show it. */
err = write_leds(led);
g_cur_led = type;
}
} else {
/* This LED is not (any longer) lit. */
if (type == g_cur_led) {
/* But it is currently showing, switch to a lower-priority LED. */
int i;
for (i = type-1; i >= 0; i--) {
if (g_leds[i].color > 0) {
/* Found a lower-priority LED to switch to. */
err = write_leds(&g_leds[i]);
goto switched;
}
}
/* No LEDs are lit, turn off. */
err = write_leds(NULL);
switched:
g_cur_led = i;
}
}
return err;
}
#ifdef LED_BLN_NODE
static int set_light_bln_notifications(struct light_device_t *dev __unused,
struct light_state_t const *state)
{
int err = 0;
pthread_mutex_lock(&g_lock);
err = write_str(LED_BLN_NODE, state->color & COLOR_MASK ? "1" : "0");
pthread_mutex_unlock(&g_lock);
return err;
}
#endif
static int set_light_leds_battery(struct light_device_t *dev __unused,
struct light_state_t const *state)
{
return set_light_leds(state, TYPE_BATTERY);
}
static int set_light_leds_notifications(struct light_device_t *dev __unused,
struct light_state_t const *state)
{
return set_light_leds(state, TYPE_NOTIFICATION);
}
static int set_light_leds_attention(struct light_device_t *dev __unused,
struct light_state_t const *state)
{
struct light_state_t fixed;
memcpy(&fixed, state, sizeof(fixed));
/* The framework does odd things with the attention lights, fix them up to
* do something sensible here. */
switch (fixed.flashMode) {
case LIGHT_FLASH_NONE:
/* LightsService.Light::stopFlashing calls with non-zero color. */
fixed.color = 0;
break;
case LIGHT_FLASH_HARDWARE:
/* PowerManagerService::setAttentionLight calls with onMS=3, offMS=0, which
* just makes for a slightly-dimmer LED. */
if (fixed.flashOnMS > 0 && fixed.flashOffMS == 0)
fixed.flashMode = LIGHT_FLASH_NONE;
fixed.color = 0x000000ff;
break;
}
return set_light_leds(&fixed, TYPE_ATTENTION);
}
static int open_lights(const struct hw_module_t *module, char const *name,
struct hw_device_t **device)
{
int requested_component;
int (*set_light)(struct light_device_t *dev,
struct light_state_t const *state);
check_component_support();
if (0 == strcmp(LIGHT_ID_BACKLIGHT, name)) {
requested_component = COMPONENT_BACKLIGHT;
set_light = set_light_backlight;
} else if (0 == strcmp(LIGHT_ID_BUTTONS, name)) {
requested_component = COMPONENT_BUTTON_LIGHT;
set_light = set_light_buttons;
} else if (0 == strcmp(LIGHT_ID_BATTERY, name)) {
requested_component = COMPONENT_LED;
set_light = set_light_leds_battery;
} else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name)) {
requested_component = COMPONENT_LED;
set_light = set_light_leds_notifications;
#ifdef LED_BLN_NODE
if (hw_components & COMPONENT_BLN) {
requested_component = COMPONENT_BLN;
set_light = set_light_bln_notifications;
}
#endif
} else if (0 == strcmp(LIGHT_ID_ATTENTION, name)) {
requested_component = COMPONENT_LED;
set_light = set_light_leds_attention;
} else {
return -EINVAL;
}
if ((hw_components & requested_component) == 0) {
ALOGV("%s: component 0x%x not supported by device", __func__,
requested_component);
return -EINVAL;
}
int max_brightness = get_max_panel_brightness();
if (max_brightness < 0) {
ALOGE("%s: failed to read max panel brightness, fallback to 255!",
__func__);
max_brightness = 255;
}
g_backlight.max_brightness = max_brightness;
pthread_once(&g_init, init_g_lock);
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,
};
struct hw_module_t HAL_MODULE_INFO_SYM = {
.tag = HARDWARE_MODULE_TAG,
.version_major = 1,
.version_minor = 0,
.id = LIGHTS_HARDWARE_MODULE_ID,
.name = "Samsung Lights Module",
.author = "The CyanogenMod Project",
.methods = &lights_module_methods,
};
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