feat: generic I2C and PCA95xx driver (#5233)

Co-authored-by: Peter Feerick <peter.feerick@gmail.com>

radio/src/hal/i2c_driver.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) EdgeTx
+ *
+ * Based on code named
+ *   opentx - https://github.com/opentx/opentx
+ *   th9x - http://code.google.com/p/th9x
+ *   er9x - http://code.google.com/p/er9x
+ *   gruvin9x - http://code.google.com/p/gruvin9x
+ *
+ * License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+typedef uint8_t etx_i2c_bus_t;
+
+int i2c_init(etx_i2c_bus_t bus);
+
+int i2c_dev_ready(etx_i2c_bus_t bus, uint16_t addr);
+
+int i2c_read(uint8_t bus, uint16_t addr, uint16_t reg, uint16_t reg_size,
+              uint8_t* data, uint16_t len);
+
+int i2c_write(uint8_t bus, uint16_t addr, uint16_t reg, uint16_t reg_size,
+              uint8_t* data, uint16_t len);
+