Get the number of available voice output volume steps.
#include <audio/audio_manager_volume.h>
int audio_manager_get_voice_output_volume_steps(audio_manager_device_t dev, int *steps)
The audio device to query.
The available volume steps returned.
The audio_manager_get_voice_output_volume_steps() function returns the number of available volume steps for voice calls.
EOK upon success, negative errno upon failure.