[ALSA] Add Native Instrument usb audio device support

Add snd-usb-caiaq driver to support caiaq usb-audio devices from
Native Instrument:
	* Native Instruments RigKontrol2
	* Native Instruments Kore Controller
	* Native Instruments Audio Kontrol 1
	* Native Instruments Audio 8 DJ

Signed-off-by: Daniel Mack <daniel@caiaq.org>
Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig
index f05d02f..315360f 100644
--- a/sound/usb/Kconfig
+++ b/sound/usb/Kconfig
@@ -29,5 +29,33 @@
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-usb-usx2y.
 
+config SND_USB_CAIAQ
+	tristate "Native Instruments USB audio devices"
+	 depends on SND && USB
+	 select SND_HWDEP
+	 select SND_RAWMIDI
+	 select SND_PCM
+	 help
+	   Say Y here to include support for caiaq USB audio interfaces,
+	   namely:
+
+	    * Native Instruments RigKontrol2
+	    * Native Instruments Kore Controller
+	    * Native Instruments Audio Kontrol 1
+	    * Native Instruments Audio 8 DJ
+
+	   To compile this driver as a module, choose M here: the module
+	   will be called snd-usb-caiaq.
+
+config SND_USB_CAIAQ_INPUT
+	bool "enable input device for controllers"
+	depends on SND_USB_CAIAQ
+	help
+	  Say Y here to support input controllers like buttons, knobs,
+	  alpha dials and analog pedals on the following products:
+
+	   * Native Instruments RigKontrol2
+	   * Native Instruments Audio Kontrol 1
+
 endmenu