Update linux_i2c.py

Add optioin for read without specifying register. Used for devices that only take a command byte (i.e. qwiic mux).

Author: santaimpersonator

qwiic_i2c/linux_i2c.py

@@ -168,11 +168,14 @@ def readWord(self, address, commandCode):
 
 		return data
 
-	def readByte(self, address, commandCode):
+	def readByte(self, address, commandCode = None):
 		data = 0
 		for i in range(_retry_count):
 			try:
-				data = self.i2cbus.read_byte_data(address, commandCode)
+				if commandCode == None:
+					data = self.i2cbus.read_byte(address)
+				elif commandCode != None:
+					data = self.i2cbus.read_byte_data(address, commandCode)
 
 				break # break if try succeeds