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authorJavier Kohen <jkohen@users.sourceforge.net>2009-11-17 09:36:13 -0500
committerTakashi Iwai <tiwai@suse.de>2009-11-17 09:49:26 -0500
commit0c3cee57efcb1c79d62b1238c0d22afef4599247 (patch)
tree3baa242e3976e67d778b9d10cffc04764510ae0a /sound/usb
parent828d44536cd24dfc085a8cf5a12364972398dcd4 (diff)
ALSA: usb - Quirk to disable master volume control in PCM2702
Disable the master volume control in the PCM2702 chipset. The datasheet documents two independent channel volume controls, one master mute control and one master volume control. All controls are fully functional except for the master volume control, which returns USB stalls on all GET requests. Signed-off-by: Javier Kohen <jkohen@users.sourceforge.net> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/usbmixer.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 9efcfd08d747..c998220b99c6 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -1071,6 +1071,15 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, unsig
1071 channels = (ftr[0] - 7) / csize - 1; 1071 channels = (ftr[0] - 7) / csize - 1;
1072 1072
1073 master_bits = snd_usb_combine_bytes(ftr + 6, csize); 1073 master_bits = snd_usb_combine_bytes(ftr + 6, csize);
1074 /* master configuration quirks */
1075 switch (state->chip->usb_id) {
1076 case USB_ID(0x08bb, 0x2702):
1077 snd_printk(KERN_INFO
1078 "usbmixer: master volume quirk for PCM2702 chip\n");
1079 /* disable non-functional volume control */
1080 master_bits &= ~(1 << (USB_FEATURE_VOLUME - 1));
1081 break;
1082 }
1074 if (channels > 0) 1083 if (channels > 0)
1075 first_ch_bits = snd_usb_combine_bytes(ftr + 6 + csize, csize); 1084 first_ch_bits = snd_usb_combine_bytes(ftr + 6 + csize, csize);
1076 else 1085 else