[media] si4713: Added the USB driver for Si4713

This is the USB driver for the Silicon Labs development board.
It contains the Si4713 FM transmitter chip.
Signed-off-by: Dinesh Ram <dinesh.ram@cern.ch>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Tested-by: Eduardo Valentin <edubezval@gmail.com>
Acked-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/radio/si4713/Kconfig

+config USB_SI4713
+	tristate "Silicon Labs Si4713 FM Radio Transmitter support with USB"
+	depends on USB && RADIO_SI4713
+	select SI4713
+	---help---
+	  This is a driver for USB devices with the Silicon Labs SI4713
+	  chip. Currently these devices are known to work.
+	  - 10c4:8244: Silicon Labs FM Transmitter USB device.
+
+	  Say Y here if you want to connect this type of radio to your
+	  computer's USB port.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called radio-usb-si4713.
+
 config PLATFORM_SI4713
 	tristate "Silicon Labs Si4713 FM Radio Transmitter support with I2C"
 	depends on I2C && RADIO_SI4713

drivers/media/radio/si4713/Makefile

@@ -3,4 +3,5 @@
 #
 
 obj-$(CONFIG_I2C_SI4713) += si4713.o
+obj-$(CONFIG_USB_SI4713) += radio-usb-si4713.o
 obj-$(CONFIG_PLATFORM_SI4713) += radio-platform-si4713.o