sound/firewire/fireworks/fireworks_midi.c

Source file repositories/reference/linux-study-clean/sound/firewire/fireworks/fireworks_midi.c

File Facts

System
Linux kernel
Corpus path
sound/firewire/fireworks/fireworks_midi.c
Extension
.c
Size
3324 bytes
Lines
139
Domain
Driver Families
Bucket
sound/firewire
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (err >= 0) {
			++efw->substreams_counter;
			err = snd_efw_stream_start_duplex(efw);
			if (err < 0)
				--efw->substreams_counter;
		}
	}
	if (err < 0)
		snd_efw_stream_lock_release(efw);
	return err;
}

static int midi_close(struct snd_rawmidi_substream *substream)
{
	struct snd_efw *efw = substream->rmidi->private_data;

	scoped_guard(mutex, &efw->mutex) {
		--efw->substreams_counter;
		snd_efw_stream_stop_duplex(efw);
	}

	snd_efw_stream_lock_release(efw);
	return 0;
}

static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
{
	struct snd_efw *efw = substrm->rmidi->private_data;

	guard(spinlock_irqsave)(&efw->lock);

	if (up)
		amdtp_am824_midi_trigger(&efw->tx_stream,
					  substrm->number, substrm);
	else
		amdtp_am824_midi_trigger(&efw->tx_stream,
					  substrm->number, NULL);
}

static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
{
	struct snd_efw *efw = substrm->rmidi->private_data;

	guard(spinlock_irqsave)(&efw->lock);

	if (up)
		amdtp_am824_midi_trigger(&efw->rx_stream,
					 substrm->number, substrm);
	else
		amdtp_am824_midi_trigger(&efw->rx_stream,
					 substrm->number, NULL);
}

static void set_midi_substream_names(struct snd_efw *efw,
				     struct snd_rawmidi_str *str)
{
	struct snd_rawmidi_substream *subs;

	list_for_each_entry(subs, &str->substreams, list) {
		scnprintf(subs->name, sizeof(subs->name),
			  "%s MIDI %d", efw->card->shortname, subs->number + 1);
	}
}

int snd_efw_create_midi_devices(struct snd_efw *efw)
{
	static const struct snd_rawmidi_ops capture_ops = {
		.open		= midi_open,
		.close		= midi_close,
		.trigger	= midi_capture_trigger,
	};
	static const struct snd_rawmidi_ops playback_ops = {
		.open		= midi_open,
		.close		= midi_close,
		.trigger	= midi_playback_trigger,
	};
	struct snd_rawmidi *rmidi;
	struct snd_rawmidi_str *str;
	int err;

	/* create midi ports */
	err = snd_rawmidi_new(efw->card, efw->card->driver, 0,
			      efw->midi_out_ports, efw->midi_in_ports,
			      &rmidi);
	if (err < 0)
		return err;

	snprintf(rmidi->name, sizeof(rmidi->name),
		 "%s MIDI", efw->card->shortname);
	rmidi->private_data = efw;

Annotation

Implementation Notes