ALSA: usb-audio: Add insertion control for UAC3 BADD

The HEADSET ADAPTER profile for BADD devices is meant to support
Insertion Control for the Input and Output Terminals of the headset.

This patch defines the BADD inferred input and output terminals and
builds the connector controls.

Signed-off-by: Jorge Sanjuan <jorge.sanjuan@codethink.co.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 17 insertions, 0 deletions

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 34fef71e0330..03b8a2ac93c8 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -2918,6 +2918,23 @@ static int snd_usb_mixer_controls_badd(struct usb_mixer_interface *mixer,
                                        UAC3_BADD_FU_ID7, map->map);
         }
 
+        /* Insertion Control */
+        if (f->subclass == UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER) {
+                struct usb_audio_term iterm, oterm;
+
+                /* Input Term - Insertion control */
+                memset(&iterm, 0, sizeof(iterm));
+                iterm.id = UAC3_BADD_IT_ID4;
+                iterm.type = UAC_BIDIR_TERMINAL_HEADSET;
+                build_connector_control(mixer, &iterm, true);
+
+                /* Output Term - Insertion control */
+                memset(&oterm, 0, sizeof(oterm));
+                oterm.id = UAC3_BADD_OT_ID3;
+                oterm.type = UAC_BIDIR_TERMINAL_HEADSET;
+                build_connector_control(mixer, &oterm, false);
+        }
+
         return 0;
 }