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/*
* Copyright (C) 2018 The Android Open Source Project
* Copyright (C) 2020 The LineageOS Project
*
* SPDX-License-Identifier: Apache-2.0
*/
// Author := dev_harsh1998, Isaac Chen
#define LOG_TAG "android.hardware.light@2.0-impl.xiaomi_sdm660"
/* #define LOG_NDEBUG 0 */
#include "Light.h"
#include <android-base/file.h>
#include <android-base/logging.h>
#include <unistd.h>
namespace {
#define PPCAT_NX(A, B) A/B
#define PPCAT(A, B) PPCAT_NX(A, B)
#define STRINGIFY_INNER(x) #x
#define STRINGIFY(x) STRINGIFY_INNER(x)
#define LEDS(x) PPCAT(/sys/class/leds, x)
#define LCD_ATTR(x) STRINGIFY(PPCAT(LEDS(lcd-backlight), x))
#define WHITE_ATTR(x) STRINGIFY(PPCAT(LEDS(white), x))
#define BUTTON_ATTR(x) STRINGIFY(PPCAT(LEDS(button-backlight), x))
#define BUTTON1_ATTR(x) STRINGIFY(PPCAT(LEDS(button-backlight1), x))
using ::android::base::ReadFileToString;
using ::android::base::WriteStringToFile;
// Default max brightness
constexpr auto kDefaultMaxLedBrightness = 255;
constexpr auto kDefaultMaxScreenBrightness = 4095;
// Each step will stay on for 50ms by default.
constexpr auto kRampStepDuration = 50;
// Each value represents a duty percent (0 - 100) for the led pwm.
constexpr std::array kBrightnessRamp = {0, 12, 25, 37, 50, 72, 85, 100};
// Write value to path and close file.
bool WriteToFile(const std::string& path, uint32_t content) {
return WriteStringToFile(std::to_string(content), path);
}
bool WriteToFile(const std::string& path, const std::string& content) {
return WriteStringToFile(content, path);
}
uint32_t RgbaToBrightness(uint32_t color) {
// Extract brightness from AARRGGBB.
uint32_t alpha = (color >> 24) & 0xFF;
// Retrieve each of the RGB colors
uint32_t red = (color >> 16) & 0xFF;
uint32_t green = (color >> 8) & 0xFF;
uint32_t blue = color & 0xFF;
// Scale RGB colors if a brightness has been applied by the user
if (alpha != 0xFF) {
red = red * alpha / 0xFF;
green = green * alpha / 0xFF;
blue = blue * alpha / 0xFF;
}
return (77 * red + 150 * green + 29 * blue) >> 8;
}
inline uint32_t RgbaToBrightness(uint32_t color, uint32_t max_brightness) {
return RgbaToBrightness(color) * max_brightness / 0xFF;
}
/*
* Scale each value of the brightness ramp according to the
* brightness of the color.
*/
std::string GetScaledDutyPcts(uint32_t brightness) {
std::stringstream ramp;
for (size_t i = 0; i < kBrightnessRamp.size(); i++) {
if (i > 0) ramp << ",";
ramp << kBrightnessRamp[i] * brightness / 0xFF;
}
return ramp.str();
}
inline bool IsLit(uint32_t color) {
return color & 0x00ffffff;
}
} // anonymous namespace
namespace android {
namespace hardware {
namespace light {
namespace V2_0 {
namespace implementation {
Light::Light() {
std::string buf;
if (ReadFileToString(LCD_ATTR(max_brightness), &buf)) {
max_screen_brightness_ = std::stoi(buf);
} else {
max_screen_brightness_ = kDefaultMaxScreenBrightness;
LOG(ERROR) << "Failed to read max screen brightness, fallback to "
<< kDefaultMaxScreenBrightness;
}
if (ReadFileToString(WHITE_ATTR(max_brightness), &buf)) {
max_led_brightness_ = std::stoi(buf);
} else {
max_led_brightness_ = kDefaultMaxLedBrightness;
LOG(ERROR) << "Failed to read max LED brightness, fallback to " << kDefaultMaxLedBrightness;
}
if (!access(BUTTON_ATTR(brightness), W_OK)) {
lights_.emplace(std::make_pair(Type::BUTTONS,
[this](auto&&... args) { setLightButtons(args...); }));
buttons_.emplace_back(BUTTON_ATTR(brightness));
if (!access(BUTTON1_ATTR(brightness), W_OK)) {
buttons_.emplace_back(BUTTON1_ATTR(brightness));
}
if (ReadFileToString(BUTTON_ATTR(max_brightness), &buf)) {
max_button_brightness_ = std::stoi(buf);
} else {
max_button_brightness_ = kDefaultMaxLedBrightness;
LOG(ERROR) << "Failed to read max button brightness, fallback to "
<< kDefaultMaxLedBrightness;
}
}
}
Return<Status> Light::setLight(Type type, const LightState& state) {
auto it = lights_.find(type);
if (it == lights_.end()) {
return Status::LIGHT_NOT_SUPPORTED;
}
it->second(type, state);
return Status::SUCCESS;
}
Return<void> Light::getSupportedTypes(getSupportedTypes_cb _hidl_cb) {
std::vector<Type> types;
for (auto&& light : lights_) types.emplace_back(light.first);
_hidl_cb(types);
return Void();
}
void Light::setLightBacklight(Type /*type*/, const LightState& state) {
uint32_t brightness = RgbaToBrightness(state.color, max_screen_brightness_);
WriteToFile(LCD_ATTR(brightness), brightness);
}
void Light::setLightButtons(Type /*type*/, const LightState& state) {
uint32_t brightness = RgbaToBrightness(state.color, max_button_brightness_);
for (auto&& button : buttons_) {
WriteToFile(button, brightness);
}
}
void Light::setLightNotification(Type type, const LightState& state) {
bool found = false;
for (auto&& [cur_type, cur_state] : notif_states_) {
if (cur_type == type) {
cur_state = state;
}
// Fallback to battery light
if (!found && (cur_type == Type::BATTERY || IsLit(cur_state.color))) {
found = true;
LOG(DEBUG) << __func__ << ": type=" << toString(cur_type);
applyNotificationState(cur_state);
}
}
}
void Light::applyNotificationState(const LightState& state) {
uint32_t white_brightness = RgbaToBrightness(state.color, max_led_brightness_);
// Turn off the leds (initially)
WriteToFile(WHITE_ATTR(blink), 0);
if (state.flashMode == Flash::TIMED && state.flashOnMs > 0 && state.flashOffMs > 0) {
/*
* If the flashOnMs duration is not long enough to fit ramping up
* and down at the default step duration, step duration is modified
* to fit.
*/
int32_t step_duration = kRampStepDuration;
int32_t pause_hi = state.flashOnMs - (step_duration * kBrightnessRamp.size() * 2);
if (pause_hi < 0) {
step_duration = state.flashOnMs / (kBrightnessRamp.size() * 2);
pause_hi = 0;
}
LOG(DEBUG) << __func__ << ": color=" << std::hex << state.color << std::dec
<< " onMs=" << state.flashOnMs << " offMs=" << state.flashOffMs;
// White
WriteToFile(WHITE_ATTR(start_idx), 0);
WriteToFile(WHITE_ATTR(duty_pcts), GetScaledDutyPcts(white_brightness));
WriteToFile(WHITE_ATTR(pause_lo), static_cast<uint32_t>(state.flashOffMs));
WriteToFile(WHITE_ATTR(pause_hi), static_cast<uint32_t>(pause_hi));
WriteToFile(WHITE_ATTR(ramp_step_ms), static_cast<uint32_t>(step_duration));
WriteToFile(WHITE_ATTR(blink), 1);
} else {
WriteToFile(WHITE_ATTR(brightness), white_brightness);
}
}
} // namespace implementation
} // namespace V2_0
} // namespace light
} // namespace hardware
} // namespace android
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