Hi,

snd_soc_dapm_put_enum_double( ) returns 0 to indicate success; otherwise an error number. The value in the function is retrieved from dapm_kcontrol_set_value( ).

change = dapm_kcontrol_set_value(kcontrol, val);

However, dapm_kcontrol_set_value( ) returns a boolean.

static bool dapm_kcontrol_set_value(const struct snd_kcontrol *kcontrol, unsigned int value) { struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);

   if (data->value == value)
           return false;

   if (data->widget)
           data->widget->on_val = value;

   data->value = value;

   return true;

}

If the value has updated successfully, dapm_kcontrol_set_value( ) will return 1 and snd_soc_dapm_put_enum_double( ) will also return 1. The value is inverted.