Add mozc dial version.

Co-authored-by: Takashi Toyoshima <toyoshim@google.com>
Co-authored-by: Shun Ikejima <ikejima@google.com>

mozc-dial/firmware/main/i2c_controller.h

@@ -0,0 +1,27 @@
+// Copyright 2025 Google Inc.
+// Use of this source code is governed by an Apache License that can be found
+// in the LICENSE file.
+
+#ifndef I2C_CONTROLLER_H_
+#define I2C_CONTROLLER_H_
+
+#include <cstdint>
+#include <span>
+
+#include "hardware/i2c.h"
+
+class I2CController final {
+ public:
+  I2CController(i2c_inst_t* i2c, int8_t sda, int8_t scl);
+  I2CController(const I2CController&) = delete;
+  I2CController& operator=(const I2CController&) = delete;
+  ~I2CController() = default;
+
+  bool Write(uint8_t device_addr, uint8_t mem_addr, std::span<uint8_t> data);
+  bool Read(uint8_t device_addr, uint8_t mem_addr, std::span<uint8_t> data);
+
+ private:
+  i2c_inst_t* i2c_ = nullptr;
+};
+
+#endif  // I2C_CONTROLLER_H_