WM8350_AUXADC_USB
[WM8350_AUXADC_USB] = "USB",
WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB);
if (channel >= WM8350_AUXADC_USB && channel <= WM8350_AUXADC_TEMP
return wm8350_read_auxadc(wm8350, WM8350_AUXADC_USB, 0, 0)