sound/firewire/dice/dice-midi.c
Source file repositories/reference/linux-study-clean/sound/firewire/dice/dice-midi.c
File Facts
- System
- Linux kernel
- Corpus path
sound/firewire/dice/dice-midi.c- Extension
.c- Size
- 3596 bytes
- Lines
- 152
- 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.
- 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.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
dice.h
Detected Declarations
function Copyrightfunction scoped_guardfunction midi_closefunction scoped_guardfunction midi_capture_triggerfunction midi_playback_triggerfunction set_midi_substream_namesfunction list_for_each_entryfunction snd_dice_create_midi
Annotated Snippet
if (err >= 0) {
++dice->substreams_counter;
err = snd_dice_stream_start_duplex(dice);
if (err < 0)
--dice->substreams_counter;
}
}
if (err < 0)
snd_dice_stream_lock_release(dice);
return err;
}
static int midi_close(struct snd_rawmidi_substream *substream)
{
struct snd_dice *dice = substream->rmidi->private_data;
scoped_guard(mutex, &dice->mutex) {
--dice->substreams_counter;
snd_dice_stream_stop_duplex(dice);
}
snd_dice_stream_lock_release(dice);
return 0;
}
static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
{
struct snd_dice *dice = substrm->rmidi->private_data;
guard(spinlock_irqsave)(&dice->lock);
if (up)
amdtp_am824_midi_trigger(&dice->tx_stream[0],
substrm->number, substrm);
else
amdtp_am824_midi_trigger(&dice->tx_stream[0],
substrm->number, NULL);
}
static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
{
struct snd_dice *dice = substrm->rmidi->private_data;
guard(spinlock_irqsave)(&dice->lock);
if (up)
amdtp_am824_midi_trigger(&dice->rx_stream[0],
substrm->number, substrm);
else
amdtp_am824_midi_trigger(&dice->rx_stream[0],
substrm->number, NULL);
}
static void set_midi_substream_names(struct snd_dice *dice,
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", dice->card->shortname, subs->number + 1);
}
}
int snd_dice_create_midi(struct snd_dice *dice)
{
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;
unsigned int midi_in_ports, midi_out_ports;
int i;
int err;
midi_in_ports = 0;
midi_out_ports = 0;
for (i = 0; i < MAX_STREAMS; ++i) {
midi_in_ports = max(midi_in_ports, dice->tx_midi_ports[i]);
midi_out_ports = max(midi_out_ports, dice->rx_midi_ports[i]);
}
Annotation
- Immediate include surface: `dice.h`.
- Detected declarations: `function Copyright`, `function scoped_guard`, `function midi_close`, `function scoped_guard`, `function midi_capture_trigger`, `function midi_playback_trigger`, `function set_midi_substream_names`, `function list_for_each_entry`, `function snd_dice_create_midi`.
- Atlas domain: Driver Families / sound/firewire.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.