hoc-overlay: add fan control feature to sysmodule

Source/sys-clk/sysmodule/src/i2c.h

@@ -0,0 +1,82 @@
+#ifndef I2C_H
+#define I2C_H
+
+#include <switch.h>
+
+Result I2cReadRegHandler16(u8 reg, I2cDevice dev, u16 *out)
+{
+	struct readReg {
+        u8 send;
+        u8 sendLength;
+        u8 sendData;
+        u8 receive;
+        u8 receiveLength;
+    };
+
+	I2cSession _session;
+
+	Result res = i2cOpenSession(&_session, dev);
+	if (res)
+		return res;
+
+	u16 val;
+
+    struct readReg readRegister = {
+        .send = 0 | (I2cTransactionOption_Start << 6),
+        .sendLength = sizeof(reg),
+        .sendData = reg,
+        .receive = 1 | (I2cTransactionOption_All << 6),
+        .receiveLength = sizeof(val),
+    };
+
+	res = i2csessionExecuteCommandList(&_session, &val, sizeof(val), &readRegister, sizeof(readRegister));
+	if (res)
+	{
+		i2csessionClose(&_session);
+		return res;
+	}
+
+	*out = val;
+	i2csessionClose(&_session);
+	return 0;
+}
+
+Result I2cReadRegHandler8(u8 reg, I2cDevice dev, u8 *out)
+{
+	struct readReg {
+        u8 send;
+        u8 sendLength;
+        u8 sendData;
+        u8 receive;
+        u8 receiveLength;
+    };
+
+	I2cSession _session;
+
+	Result res = i2cOpenSession(&_session, dev);
+	if (res)
+		return res;
+
+	u8 val;
+
+    struct readReg readRegister = {
+        .send = 0 | (I2cTransactionOption_Start << 6),
+        .sendLength = sizeof(reg),
+        .sendData = reg,
+        .receive = 1 | (I2cTransactionOption_All << 6),
+        .receiveLength = sizeof(val),
+    };
+
+	res = i2csessionExecuteCommandList(&_session, &val, sizeof(val), &readRegister, sizeof(readRegister));
+	if (res)
+	{
+		i2csessionClose(&_session);
+		return res;
+	}
+
+	*out = val;
+	i2csessionClose(&_session);
+	return 0;
+}
+
+#endif