[PATCH 3/3] Add Kconfig option for Audient EVO4 mixer quirks

[Christian Ruppert <arc@gmx.li>]

Add Kconfig option for the Audient EVO4 support. This is split out from
the evo4 driver so it can be optionally applied. Other mixer quirks don't
seem to have Kconfig options so I leave it to the upstream to decide what
to do with this.

Signed-off-by: Christian Ruppert <arc@gmx.li>
---
 sound/usb/Kconfig        | 10 ++++++++++
 sound/usb/Makefile       |  3 ++-
 sound/usb/mixer_quirks.c |  4 ++++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig
index b4588915efa1..21039dd4ae3a 100644
--- a/sound/usb/Kconfig
+++ b/sound/usb/Kconfig
@@ -175,6 +175,16 @@ config SND_USB_HIFACE
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-usb-hiface.
 
+config SND_USB_EVO
+	bool "Audient EVO advanced mixer features"
+	help
+	  Support advanced mixer features for the Audient EVO4 USB audio
+	  interface such as
+	    * the recording mixer
+	    * the monitor crossfader
+	    * phantom power control
+	    * missing channel mute buttons
+
 config SND_BCD2000
 	tristate "Behringer BCD2000 MIDI driver"
 	select SND_RAWMIDI
diff --git a/sound/usb/Makefile b/sound/usb/Makefile
index 2e842dcc73de..f3664adeab85 100644
--- a/sound/usb/Makefile
+++ b/sound/usb/Makefile
@@ -11,7 +11,6 @@ snd-usb-audio-y := 	card.o \
 			helper.o \
 			implicit.o \
 			mixer.o \
-			mixer_evo.o \
 			mixer_quirks.o \
 			mixer_scarlett.o \
 			mixer_scarlett2.o \
@@ -27,6 +26,8 @@ snd-usb-audio-y := 	card.o \
 snd-usb-audio-$(CONFIG_SND_USB_AUDIO_MIDI_V2) += midi2.o
 snd-usb-audio-$(CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER) += media.o
 
+snd-usb-audio-$(CONFIG_SND_USB_EVO) += mixer_evo.o
+
 snd-usbmidi-lib-y := midi.o
 
 # Toplevel Module Dependency
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index 1e266fdbbb8e..c32ccff40122 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -38,7 +38,9 @@
 #include "mixer_scarlett2.h"
 #include "mixer_us16x08.h"
 #include "mixer_s1810c.h"
+#ifdef CONFIG_SND_USB_EVO
 #include "mixer_evo.h"
+#endif
 #include "helper.h"
 #include "fcp.h"
 
@@ -4540,9 +4542,11 @@ int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer)
 		err = snd_fcp_init(mixer);
 		break;
 
+#ifdef CONFIG_SND_USB_EVO
 	case USB_ID(USB_AUDIENT_VID, USB_EVO4_PID): /* Audient EVO 4 */
 		err = snd_evo_controls_create(mixer);
 		break;
+#endif
 
 	case USB_ID(0x041e, 0x323b): /* Creative Sound Blaster E1 */
 		err = snd_soundblaster_e1_switch_create(mixer);
-- 
2.55.0