ALSA: usb-audio: Set the Control Selector to SU_SELECTOR_CONTROL for UAC2

Specified in section 5.2.5.6.1 of the USB Audio Class 2.0 definition.

Solves the following error for C-Media 6632A (Asus Xonar U7):
[ 8219.676164] cannot get ctl value: req = 0x81, wValue = 0x0, wIndex = 0x1400, type = 3

Signed-off-by: Johan Rastén <johan@oljud.se>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 4 insertions, 3 deletions

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 2e4a9dbc51fa..6e354d326858 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -2033,10 +2033,11 @@ static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
         cval->res = 1;
         cval->initialized = 1;
 
-        if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
-                cval->control = UAC2_CX_CLOCK_SELECTOR;
-        else
+        if (state->mixer->protocol == UAC_VERSION_1)
                 cval->control = 0;
+        else /* UAC_VERSION_2 */
+                cval->control = (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR) ?
+                        UAC2_CX_CLOCK_SELECTOR : UAC2_SU_SELECTOR;
 
         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
         if (!namelist) {