snd_soc_dapm_pin_has_prefix
bool snd_soc_dapm_pin_has_prefix(struct snd_soc_card *card, const char *pin);
bool pin_has_prefix = snd_soc_dapm_pin_has_prefix(dapm->card, pin);
EXPORT_SYMBOL_GPL(snd_soc_dapm_pin_has_prefix);