WM8993_DAC_CTRL
reg = snd_soc_component_read(component, WM8993_DAC_CTRL);
snd_soc_component_write(component, WM8993_DAC_CTRL, reg);
case WM8993_DAC_CTRL:
WM8993_DAC_CTRL, 4, dac_deemph_text);