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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>
This commit is contained in:
Johan Rastén 2014-11-17 08:39:33 +01:00 committed by Takashi Iwai
parent 6e84a8d7ac
commit a358a0ef86
1 changed files with 4 additions and 3 deletions
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7
sound/usb/mixer.c
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@ -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) {