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authorDaniel Mack <daniel@caiaq.de>2010-02-22 23:49:12 +0100
committerTakashi Iwai <tiwai@suse.de>2010-02-23 08:40:26 +0100
commit7b8a043f2686af9f41e313a78ed5e98233e5fded (patch)
treeaf7b3a3d2a6394b2a6053681b7f251315570b293 /sound
parent53ee98fe8ac77d00bacc1c814d450d83cbd193d4 (diff)
ALSA: usbmixer: bail out early when parsing audio class v2 descriptors
This is just a quick hack that needs to be removed once the new units defined by the audio class v2.0 standard are supported. However, it allows using these devices for now, without mixer support. Signed-off-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/usb/usbmixer.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index ca7949598191..42bb95c739a8 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -2258,7 +2258,8 @@ int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
};
struct usb_mixer_interface *mixer;
struct snd_info_entry *entry;
- int err;
+ struct usb_host_interface *host_iface;
+ int err, protocol;
strcpy(chip->card->mixername, "USB Mixer");
@@ -2275,6 +2276,16 @@ int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
return -ENOMEM;
}
+ host_iface = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
+ protocol = host_iface->desc.bInterfaceProtocol;
+
+ /* FIXME! */
+ if (protocol != UAC_VERSION_1) {
+ snd_printk(KERN_WARNING "mixer interface protocol 0x%02x not yet supported\n",
+ protocol);
+ return 0;
+ }
+
if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
(err = snd_usb_mixer_status_create(mixer)) < 0)
goto _error;