ALSA: usb-audio: Use Class Specific EP for UAC3 devices.

bmAtributes offset doesn't exist in the UAC3 CS_EP descriptor.
Hence, checking for pitch control as if it was UAC2 doesn't make
any sense. Use the defined UAC3 offsets instead.

Fixes: 9a2fe9b801f5 ("ALSA: usb: initial USB Audio Device Class 3.0 support")
Signed-off-by: Jorge Sanjuan <jorge.sanjuan@codethink.co.uk>
Reviewed-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 956be9f..5ed3345 100644 (file)
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -576,7 +576,7 @@ static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
 
        if (protocol == UAC_VERSION_1) {
                attributes = csep->bmAttributes;
-       } else {
+       } else if (protocol == UAC_VERSION_2) {
                struct uac2_iso_endpoint_descriptor *csep2 =
                        (struct uac2_iso_endpoint_descriptor *) csep;
 
@@ -585,6 +585,13 @@ static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
                /* emulate the endpoint attributes of a v1 device */
                if (csep2->bmControls & UAC2_CONTROL_PITCH)
                        attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
+       } else { /* UAC_VERSION_3 */
+               struct uac3_iso_endpoint_descriptor *csep3 =
+                       (struct uac3_iso_endpoint_descriptor *) csep;
+
+               /* emulate the endpoint attributes of a v1 device */
+               if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
+                       attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
        }
 
        return attributes;