e82a9b5117
* Our maximum brightness is 500. * However, for safety related reason, I have capped this to 255. * 255 is more than sufficient, and I do not want to be responsible for LED damage. * Finding the default percentage took some trial and error, in this case, 59% correlated to 75. Co-authored-by: rahul <rahul@aospa.co> Signed-off-by: rahul <rahul@aospa.co>
76 lines
2.0 KiB
C++
76 lines
2.0 KiB
C++
/*
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* Copyright (C) 2024 LibreMobileOS Foundation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "CameraProviderExtension.h"
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#include <fstream>
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#define TORCH_BRIGHTNESS "brightness"
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#define TORCH_MAX_BRIGHTNESS "max_brightness"
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#define TOGGLE_SWITCH "/sys/devices/platform/soc/c42d000.qcom,spmi/spmi-0/0-02/c42d000.qcom,spmi:qcom,pm8350c@2:qcom,flash_led@ee00/leds/led:switch_2/brightness"
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static std::string kTorchLedPath = "/sys/devices/platform/soc/c42d000.qcom,spmi/spmi-0/0-02/c42d000.qcom,spmi:qcom,pm8350c@2:qcom,flash_led@ee00/leds/led:torch_0";
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/**
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* Write value to path and close file.
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*/
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template <typename T>
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static void set(const std::string& path, const T& value) {
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std::ofstream file(path);
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file << value;
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}
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/**
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* Read value from the path and close file.
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*/
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template <typename T>
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static T get(const std::string& path, const T& def) {
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std::ifstream file(path);
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T result;
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file >> result;
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return file.fail() ? def : result;
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}
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bool supportsTorchStrengthControlExt() {
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return true;
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}
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bool supportsSetTorchModeExt() {
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return false;
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}
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int32_t getTorchDefaultStrengthLevelExt() {
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// Our default value is 75. This corresponds to 15%.
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// As we have changed the maximum value, 59% now corresponds to 75.
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return 59;
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}
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int32_t getTorchMaxStrengthLevelExt() {
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// 255 out of 500 is a sane brightness.
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// Let's cap it to 255 as max, we can go much higher, but I don't want to test this.
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return 255;
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}
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int32_t getTorchStrengthLevelExt() {
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// We write same value in the both LEDs,
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// so get from one.
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auto node = kTorchLedPath + "/" + TORCH_BRIGHTNESS;
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return get(node, 0);
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}
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void setTorchStrengthLevelExt(int32_t torchStrength, bool enabled) {
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set(TOGGLE_SWITCH, 0);
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auto node = kTorchLedPath + "/" + TORCH_BRIGHTNESS;
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set(node, torchStrength);
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if (enabled)
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set(TOGGLE_SWITCH, 255);
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}
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void setTorchModeExt(bool enabled) {
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int32_t strength = getTorchDefaultStrengthLevelExt();
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setTorchStrengthLevelExt(enabled ? strength : 0, enabled);
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}
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