sound/firewire/dice/dice-presonus.c

Source file repositories/reference/linux-study-clean/sound/firewire/dice/dice-presonus.c

File Facts

System
Linux kernel
Corpus path
sound/firewire/dice/dice-presonus.c
Extension
.c
Size
1484 bytes
Lines
61
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

struct dice_presonus_spec {
	unsigned int tx_pcm_chs[MAX_STREAMS][SND_DICE_RATE_MODE_COUNT];
	unsigned int rx_pcm_chs[MAX_STREAMS][SND_DICE_RATE_MODE_COUNT];
	bool has_midi;
};

static const struct dice_presonus_spec dice_presonus_firesutio = {
	.tx_pcm_chs = {{16, 16, 0}, {10, 2, 0} },
	.rx_pcm_chs = {{16, 16, 0}, {10, 2, 0} },
	.has_midi = true,
};

int snd_dice_detect_presonus_formats(struct snd_dice *dice)
{
	static const struct {
		u32 model_id;
		const struct dice_presonus_spec *spec;
	} *entry, entries[] = {
		{0x000008, &dice_presonus_firesutio},
	};
	struct fw_csr_iterator it;
	int key, val, model_id;
	int i;

	model_id = 0;
	fw_csr_iterator_init(&it, dice->unit->directory);
	while (fw_csr_iterator_next(&it, &key, &val)) {
		if (key == CSR_MODEL) {
			model_id = val;
			break;
		}
	}

	for (i = 0; i < ARRAY_SIZE(entries); ++i) {
		entry = entries + i;
		if (entry->model_id == model_id)
			break;
	}
	if (i == ARRAY_SIZE(entries))
		return -ENODEV;

	memcpy(dice->tx_pcm_chs, entry->spec->tx_pcm_chs,
	       MAX_STREAMS * SND_DICE_RATE_MODE_COUNT * sizeof(unsigned int));
	memcpy(dice->rx_pcm_chs, entry->spec->rx_pcm_chs,
	       MAX_STREAMS * SND_DICE_RATE_MODE_COUNT * sizeof(unsigned int));

	if (entry->spec->has_midi) {
		dice->tx_midi_ports[0] = 1;
		dice->rx_midi_ports[0] = 1;
	}

	return 0;
}

Annotation

Implementation Notes