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>

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 4bd3a7a..ec9cdf9 100644 (file)
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -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",