vol_to 311 sound/soc/codecs/nau8825.c unsigned int vol_from, unsigned int vol_to, unsigned int step) vol_to 315 sound/soc/codecs/nau8825.c if (vol_from == vol_to || step == 0) { vol_to 317 sound/soc/codecs/nau8825.c } else if (vol_from < vol_to) { vol_to 320 sound/soc/codecs/nau8825.c to = vol_to; vol_to 323 sound/soc/codecs/nau8825.c from = vol_to;