lilygo-t-cameraplus-s3 add pmic (#586)

main/boards/common/sy6970.h

@@ -0,0 +1,21 @@
+#ifndef __SY6970_H__
+#define __SY6970_H__
+
+#include "i2c_device.h"
+
+class Sy6970 : public I2cDevice {
+public:
+    Sy6970(i2c_master_bus_handle_t i2c_bus, uint8_t addr);
+    bool IsCharging();
+    bool IsPowerGood();
+    bool IsChargingDone();
+    int GetBatteryLevel();
+    void PowerOff();
+
+private:
+    int GetChangingStatus();
+    int GetBatteryVoltage();
+    int GetChargeTargetVoltage();
+};
+
+#endif