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>

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 2e4a9db..6e354d3 100644 (file)
--- 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) {