snd_soc_dapm_regulator_event
.reg = SND_SOC_NOPM, .shift = wdelay, .event = snd_soc_dapm_regulator_event, \
int snd_soc_dapm_regulator_event(struct snd_soc_dapm_widget *w, struct snd_kcontrol *kcontrol, int event);
EXPORT_SYMBOL_GPL(snd_soc_dapm_regulator_event);