Implement battery support for LilyGO T-HMI S3 (#511)

Devices/lilygo-thmi-s3/Source/devices/Power.h

@@ -1,10 +1,33 @@
 #pragma once
 
-#include <memory>
-#include <Tactility/hal/power/PowerDevice.h>
+#include <string>
+#include <esp_adc_cal.h>
 #include <driver/gpio.h>
+#include <ChargeFromVoltage.h>
+#include <Tactility/hal/power/PowerDevice.h>
 
 constexpr auto THMI_S3_POWEREN_GPIO = GPIO_NUM_10;
 constexpr auto THMI_S3_POWERON_GPIO = GPIO_NUM_14;
 
-std::shared_ptr<tt::hal::power::PowerDevice> createPower();
+using tt::hal::power::PowerDevice;
+
+class Power final : public PowerDevice {
+
+    ChargeFromVoltage chargeFromAdcVoltage = ChargeFromVoltage(3.3f, 4.2f);
+    bool initialized = false;
+    esp_adc_cal_characteristics_t adcCharacteristics;
+    bool calibrated = false;
+
+    bool adcInitCalibration();
+    uint32_t adcReadValue() const;
+
+    bool ensureInitialized();
+
+public:
+
+    std::string getName() const override { return "T-hmi Power"; }
+    std::string getDescription() const override { return "Power measurement via ADC"; }
+
+    bool supportsMetric(MetricType type) const override;
+    bool getMetric(MetricType type, MetricData& data) override;
+};