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ALSA: usb-audio - Volume control quirk for QuickCam E 3500 

- E3500 report cval->max more than it actually can handel, so if you
set 95% capture level it will be silently muted.
- Betwen cval->min and cval-max(real) is 2940 control units,
but real are only 7 with cval->res = 384.
- Alsa can't handel less than 10 controls, so make it more
and set cval->res = 192.

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 2009-07-22 14:57:54 +02:00 committed by Takashi Iwai
parent 8886f33f25
commit 2cf313ee75
1 changed files with 20 additions and 5 deletions
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25
sound/usb/usbmixer.c
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@ -990,20 +990,35 @@ static void build_feature_ctl(struct mixer_build *state, unsigned char *desc,
break;
}
/* quirk for UDA1321/N101 */
/* note that detection between firmware 2.1.1.7 (N101) and later 2.1.1.21 */
/* is not very clear from datasheets */
/* I hope that the min value is -15360 for newer firmware --jk */
/* volume control quirks */
switch (state->chip->usb_id) {
case USB_ID(0x0471, 0x0101):
case USB_ID(0x0471, 0x0104):
case USB_ID(0x0471, 0x0105):
case USB_ID(0x0672, 0x1041):
/* quirk for UDA1321/N101.
* note that detection between firmware 2.1.1.7 (N101)
* and later 2.1.1.21 is not very clear from datasheets.
* I hope that the min value is -15360 for newer firmware --jk
*/
if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
cval->min == -15616) {
snd_printk(KERN_INFO "using volume control quirk for the UDA1321/N101 chip\n");
snd_printk(KERN_INFO
"set volume quirk for UDA1321/N101 chip\n");
cval->max = -256;
}
break;
case USB_ID(0x046d, 0x09a4):
if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
snd_printk(KERN_INFO
"set volume quirk for QuickCam E3500\n");
cval->min = 6080;
cval->max = 8768;
cval->res = 192;
}
break;
}
snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",