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authorDaniel Mack <daniel@caiaq.de>2010-05-31 15:35:37 +0400
committerTakashi Iwai <tiwai@suse.de>2010-05-31 20:15:57 +0400
commita6a3325913efbe35a10e87fd3e9c3ce621fd32c7 (patch)
tree4b3300083115516ff8fff200da4d4300dea3b853 /sound/usb/mixer.h
parentdcbe7bcfa32c5bc4f9bb6c75d4d41bb4db8c36fc (diff)
downloadlinux-a6a3325913efbe35a10e87fd3e9c3ce621fd32c7.tar.xz
ALSA: usb-audio: support partially write-protected UAC2 controls
So far, UAC2 controls are marked read-only if any of the channels are marked read-only in the descriptors. Change this behaviour and - mark them writeable unless all channels are read-only - store the read-only mask in usb_mixer_elem_info and - check the mask again in set_cur_mix_value(), and bail out for write-protected channels. Signed-off-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/mixer.h')
-rw-r--r--sound/usb/mixer.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
index 130123854a6c..a7cf1007fbb0 100644
--- a/sound/usb/mixer.h
+++ b/sound/usb/mixer.h
@@ -34,6 +34,8 @@ struct usb_mixer_elem_info {
unsigned int id;
unsigned int control; /* CS or ICN (high byte) */
unsigned int cmask; /* channel mask bitmap: 0 = master */
+ unsigned int ch_readonly;
+ unsigned int master_readonly;
int channels;
int val_type;
int min, max, res;