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ALSA: usb-audio - Add volume resolution quirk for some Logitech webcams 

Some programs like Skype trying to set capture volume automatically.
Normally it will tray, carefully step by step lover or higher, set the volume.
In real word it work not really well, because devises and vendors lie about
real audio settings.
For example most Logitech webcams have 6400 or 3500 steps for capture volume.
They do not tell that actual resolution is 384. So we have only 7 or 18 real
steps. In this patch I set real resolution only for tested devices.

Signed-off-by: Alexey Fisher <bug-track@fisher-privat.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Alexey Fisher 2010-06-23 14:17:09 +02:00 committed by Takashi Iwai
parent 272cbc98cf
commit a5c7d797dc
1 changed files with 13 additions and 0 deletions
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13
sound/usb/mixer.c
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@ -1107,6 +1107,19 @@ static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
}
break;
case USB_ID(0x046d, 0x0809):
case USB_ID(0x046d, 0x0991):
/* Most audio usb devices lie about volume resolution.
* Most Logitech webcams have res = 384.
* Proboly there is some logitech magic behind this number --fishor
*/
if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
snd_printk(KERN_INFO
"set resolution quirk: cval->res = 384\n");
cval->res = 384;
}
break;
}
snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",