sound/pci/oxygen/oxygen_mixer.c

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

File Facts

System
Linux kernel
Corpus path
sound/pci/oxygen/oxygen_mixer.c
Extension
.c
Size
31620 bytes
Lines
1106
Domain
Driver Families
Bucket
sound/pci
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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 (value->value.integer.value[i] != chip->dac_volume[i]) {
			chip->dac_volume[i] = value->value.integer.value[i];
			changed = 1;
		}
	if (changed)
		chip->model.update_dac_volume(chip);
	return changed;
}

static int dac_mute_get(struct snd_kcontrol *ctl,
			struct snd_ctl_elem_value *value)
{
	struct oxygen *chip = ctl->private_data;

	guard(mutex)(&chip->mutex);
	value->value.integer.value[0] = !chip->dac_mute;
	return 0;
}

static int dac_mute_put(struct snd_kcontrol *ctl,
			  struct snd_ctl_elem_value *value)
{
	struct oxygen *chip = ctl->private_data;
	int changed;

	guard(mutex)(&chip->mutex);
	changed = (!value->value.integer.value[0]) != chip->dac_mute;
	if (changed) {
		chip->dac_mute = !value->value.integer.value[0];
		chip->model.update_dac_mute(chip);
	}
	return changed;
}

static unsigned int upmix_item_count(struct oxygen *chip)
{
	if (chip->model.dac_channels_pcm < 8)
		return 2;
	else if (chip->model.update_center_lfe_mix)
		return 5;
	else
		return 3;
}

static int upmix_info(struct snd_kcontrol *ctl, struct snd_ctl_elem_info *info)
{
	static const char *const names[5] = {
		"Front",
		"Front+Surround",
		"Front+Surround+Back",
		"Front+Surround+Center/LFE",
		"Front+Surround+Center/LFE+Back",
	};
	struct oxygen *chip = ctl->private_data;
	unsigned int count = upmix_item_count(chip);

	return snd_ctl_enum_info(info, 1, count, names);
}

static int upmix_get(struct snd_kcontrol *ctl, struct snd_ctl_elem_value *value)
{
	struct oxygen *chip = ctl->private_data;

	guard(mutex)(&chip->mutex);
	value->value.enumerated.item[0] = chip->dac_routing;
	return 0;
}

void oxygen_update_dac_routing(struct oxygen *chip)
{
	/* DAC 0: front, DAC 1: surround, DAC 2: center/LFE, DAC 3: back */
	static const unsigned int reg_values[5] = {
		/* stereo -> front */
		(0 << OXYGEN_PLAY_DAC0_SOURCE_SHIFT) |
		(1 << OXYGEN_PLAY_DAC1_SOURCE_SHIFT) |
		(2 << OXYGEN_PLAY_DAC2_SOURCE_SHIFT) |
		(3 << OXYGEN_PLAY_DAC3_SOURCE_SHIFT),
		/* stereo -> front+surround */
		(0 << OXYGEN_PLAY_DAC0_SOURCE_SHIFT) |
		(0 << OXYGEN_PLAY_DAC1_SOURCE_SHIFT) |
		(2 << OXYGEN_PLAY_DAC2_SOURCE_SHIFT) |
		(3 << OXYGEN_PLAY_DAC3_SOURCE_SHIFT),
		/* stereo -> front+surround+back */
		(0 << OXYGEN_PLAY_DAC0_SOURCE_SHIFT) |
		(0 << OXYGEN_PLAY_DAC1_SOURCE_SHIFT) |
		(2 << OXYGEN_PLAY_DAC2_SOURCE_SHIFT) |
		(0 << OXYGEN_PLAY_DAC3_SOURCE_SHIFT),
		/* stereo -> front+surround+center/LFE */
		(0 << OXYGEN_PLAY_DAC0_SOURCE_SHIFT) |
		(0 << OXYGEN_PLAY_DAC1_SOURCE_SHIFT) |

Annotation

Implementation Notes