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>

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 6939d0f517d9bd42928f87e7f6a4e9fd35bff9b4..736d134cc03c58a15a49e81e5e7bafb85d135dba 100644 (file)
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -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",