sound/pci/oxygen/oxygen_pcm.c

Source file repositories/reference/linux-study-clean/sound/pci/oxygen/oxygen_pcm.c

File Facts

System
Linux kernel
Corpus path
sound/pci/oxygen/oxygen_pcm.c
Extension
.c
Size
22144 bytes
Lines
773
Domain
Driver Families
Bucket
sound/pci
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 (chip->model.device_config & CAPTURE_1_FROM_SPDIF) {
			runtime->hw.rates &= ~(SNDRV_PCM_RATE_32000 |
					       SNDRV_PCM_RATE_64000);
			runtime->hw.rate_min = 44100;
		}
		fallthrough;
	case PCM_A:
	case PCM_B:
		runtime->hw.fifo_size = 0;
		break;
	case PCM_MULTICH:
		runtime->hw.channels_max = chip->model.dac_channels_pcm;
		break;
	}
	if (chip->model.pcm_hardware_filter)
		chip->model.pcm_hardware_filter(channel, &runtime->hw);
	err = snd_pcm_hw_constraint_step(runtime, 0,
					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
	if (err < 0)
		return err;
	err = snd_pcm_hw_constraint_step(runtime, 0,
					 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
	if (err < 0)
		return err;
	if (runtime->hw.formats & SNDRV_PCM_FMTBIT_S32_LE) {
		err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
		if (err < 0)
			return err;
	}
	if (runtime->hw.channels_max > 2) {
		err = snd_pcm_hw_constraint_step(runtime, 0,
						 SNDRV_PCM_HW_PARAM_CHANNELS,
						 2);
		if (err < 0)
			return err;
	}
	snd_pcm_set_sync(substream);
	chip->streams[channel] = substream;

	guard(mutex)(&chip->mutex);
	chip->pcm_active |= 1 << channel;
	if (channel == PCM_SPDIF) {
		chip->spdif_pcm_bits = chip->spdif_bits;
		chip->controls[CONTROL_SPDIF_PCM]->vd[0].access &=
			~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE |
			       SNDRV_CTL_EVENT_MASK_INFO,
			       &chip->controls[CONTROL_SPDIF_PCM]->id);
	}

	return 0;
}

static int oxygen_rec_a_open(struct snd_pcm_substream *substream)
{
	return oxygen_open(substream, PCM_A);
}

static int oxygen_rec_b_open(struct snd_pcm_substream *substream)
{
	return oxygen_open(substream, PCM_B);
}

static int oxygen_rec_c_open(struct snd_pcm_substream *substream)
{
	return oxygen_open(substream, PCM_C);
}

static int oxygen_spdif_open(struct snd_pcm_substream *substream)
{
	return oxygen_open(substream, PCM_SPDIF);
}

static int oxygen_multich_open(struct snd_pcm_substream *substream)
{
	return oxygen_open(substream, PCM_MULTICH);
}

static int oxygen_ac97_open(struct snd_pcm_substream *substream)
{
	return oxygen_open(substream, PCM_AC97);
}

static int oxygen_close(struct snd_pcm_substream *substream)
{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	unsigned int channel = oxygen_substream_channel(substream);

	guard(mutex)(&chip->mutex);
	chip->pcm_active &= ~(1 << channel);

Annotation

Implementation Notes