+/* volume control quirks */
+static void volume_control_quirks(struct usb_mixer_elem_info *cval,
+ struct snd_kcontrol *kctl)
+{
+ switch (cval->mixer->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
+ "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;
+
+ case USB_ID(0x046d, 0x0808):
+ case USB_ID(0x046d, 0x0809):
+ case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
+ 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;
+
+ }
+}
+