ad1843_set_gain
int ad1843_set_gain(struct snd_ad1843 *ad1843, int id, int newval);
ad1843_set_gain(ad1843, AD1843_GAIN_RECLEV, 0);
ad1843_set_gain(ad1843, AD1843_GAIN_LINE, 0);
ad1843_set_gain(ad1843, AD1843_GAIN_LINE_2, 0);
ad1843_set_gain(ad1843, AD1843_GAIN_MIC, 0);
ad1843_set_gain(ad1843, AD1843_GAIN_PCM_0, 0);
ad1843_set_gain(ad1843, AD1843_GAIN_PCM_1, 0);
newvol = ad1843_set_gain(&chip->ad1843, kcontrol->private_value,