[alsa-devel] [PATCH 05/15] ALSA: dice: Add support for MIDI capture/playback

[Clemens Ladisch]

Takashi Sakamoto wrote:
> This commit adds a support for MIDI capture/playback
>
> +++ b/sound/firewire/dice/dice-midi.c
> +static int capture_open(struct snd_rawmidi_substream *substream)
> +{
> +	struct snd_dice *dice = substream->rmidi->private_data;
> +	int err;
> +
> +	err = snd_dice_stream_lock_try(dice);
> +	if (err < 0)
> +		return err;
> +
> +	mutex_lock(&dice->mutex);
> +
> +	dice->substreams_counter++;
> +	err = snd_dice_stream_start_duplex(dice, 0);
> +
> +	mutex_unlock(&dice->mutex);
> +
> +	if (err < 0)
> +		snd_dice_stream_lock_release(dice);
> +
> +	return err;
> +}
> +
> +static int playback_open(struct snd_rawmidi_substream *substream)
> +{
> +	struct snd_dice *dice = substream->rmidi->private_data;
> +	int err;
> +
> +	err = snd_dice_stream_lock_try(dice);
> +	if (err < 0)
> +		return err;
> +
> +	mutex_lock(&dice->mutex);
> +
> +	dice->substreams_counter++;
> +	err = snd_dice_stream_start_duplex(dice, 0);
> +
> +	mutex_unlock(&dice->mutex);
> +
> +	if (err < 0)
> +		snd_dice_stream_lock_release(dice);
> +
> +	return err;
> +}

These two functions are identical.

> +static int capture_close(struct snd_rawmidi_substream *substream)
> +{
> +	struct snd_dice *dice = substream->rmidi->private_data;
> +
> +	mutex_lock(&dice->mutex);
> +
> +	dice->substreams_counter--;
> +	snd_dice_stream_stop_duplex(dice);
> +
> +	mutex_unlock(&dice->mutex);
> +
> +	snd_dice_stream_lock_release(dice);
> +	return 0;
> +}
> +
> +static int playback_close(struct snd_rawmidi_substream *substream)
> +{
> +	struct snd_dice *dice = substream->rmidi->private_data;
> +
> +	mutex_lock(&dice->mutex);
> +
> +	dice->substreams_counter--;
> +	snd_dice_stream_stop_duplex(dice);
> +
> +	mutex_unlock(&dice->mutex);
> +
> +	snd_dice_stream_lock_release(dice);
> +	return 0;
> +}

These two too.

> +static void set_midi_substream_names(struct snd_dice *dice,
> +				     struct snd_rawmidi_str *str)
> +{
> +	list_for_each_entry(subs, &str->substreams, list) {
> +		snprintf(subs->name, sizeof(subs->name),
> +			 "%s MIDI %d", dice->card->shortname, subs->number + 1);

This is not really important, but the number is useless when the
device has only one MIDI port.


Regards,
Clemens