linux_gpio: pin should be unsigned int

Signed-off-by: Nicolae Rosia <nicolae.rosia@gmail.com>

src/drivers/linux_gpio/linux_gpio.cpp

@@ -184,7 +184,7 @@ cleanup:
 	return ret;
 }
 
-int LinuxGPIO::_readValue(int pin)
+int LinuxGPIO::_readValue(unsigned int pin)
 {
 	char path[PIN_VALUE_BUFFER_MAX];
 	char buf[2];
@@ -218,7 +218,7 @@ cleanup:
 	return ret;
 }
 
-int LinuxGPIO::_writeValue(int pin, unsigned int value)
+int LinuxGPIO::_writeValue(unsigned int pin, unsigned int value)
 {
 	char path[PIN_VALUE_BUFFER_MAX];
 	char buf[2];

src/drivers/linux_gpio/linux_gpio.h

@@ -68,8 +68,8 @@ private:
 	static int _exportPin(unsigned int pin);
 	static int _unexportPin(unsigned int pin);
 	static int _setDirection(unsigned int pin, int dir);
-	static int _readValue(int pin);
-	static int _writeValue(int pin, unsigned int value);
+	static int _readValue(unsigned int pin);
+	static int _writeValue(unsigned int pin, unsigned int value);
 
 	int _pin;
 };