sound/pci/oxygen/xonar_lib.c

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

File Facts

System
Linux kernel
Corpus path
sound/pci/oxygen/xonar_lib.c
Extension
.c
Size
3260 bytes
Lines
123
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 (has_power) {
			dev_notice(chip->card->dev, "power restored\n");
		} else {
			dev_crit(chip->card->dev,
				   "Hey! Don't unplug the power cable!\n");
			/* TODO: stop PCMs */
		}
	}
}

void xonar_init_ext_power(struct oxygen *chip)
{
	struct xonar_generic *data = chip->model_data;

	oxygen_set_bits8(chip, data->ext_power_int_reg,
			 data->ext_power_bit);
	chip->interrupt_mask |= OXYGEN_INT_GPIO;
	chip->model.gpio_changed = xonar_ext_power_gpio_changed;
	data->has_power = !!(oxygen_read8(chip, data->ext_power_reg)
			     & data->ext_power_bit);
}

void xonar_init_cs53x1(struct oxygen *chip)
{
	oxygen_set_bits16(chip, OXYGEN_GPIO_CONTROL, GPIO_CS53x1_M_MASK);
	oxygen_write16_masked(chip, OXYGEN_GPIO_DATA,
			      GPIO_CS53x1_M_SINGLE, GPIO_CS53x1_M_MASK);
}

void xonar_set_cs53x1_params(struct oxygen *chip,
			     struct snd_pcm_hw_params *params)
{
	unsigned int value;

	if (params_rate(params) <= 54000)
		value = GPIO_CS53x1_M_SINGLE;
	else if (params_rate(params) <= 108000)
		value = GPIO_CS53x1_M_DOUBLE;
	else
		value = GPIO_CS53x1_M_QUAD;
	oxygen_write16_masked(chip, OXYGEN_GPIO_DATA,
			      value, GPIO_CS53x1_M_MASK);
}

int xonar_gpio_bit_switch_get(struct snd_kcontrol *ctl,
			      struct snd_ctl_elem_value *value)
{
	struct oxygen *chip = ctl->private_data;
	u16 bit = ctl->private_value;
	bool invert = ctl->private_value & XONAR_GPIO_BIT_INVERT;

	value->value.integer.value[0] =
		!!(oxygen_read16(chip, OXYGEN_GPIO_DATA) & bit) ^ invert;
	return 0;
}

int xonar_gpio_bit_switch_put(struct snd_kcontrol *ctl,
			      struct snd_ctl_elem_value *value)
{
	struct oxygen *chip = ctl->private_data;
	u16 bit = ctl->private_value;
	bool invert = ctl->private_value & XONAR_GPIO_BIT_INVERT;
	u16 old_bits, new_bits;
	int changed;

	guard(spinlock_irq)(&chip->reg_lock);
	old_bits = oxygen_read16(chip, OXYGEN_GPIO_DATA);
	if (!!value->value.integer.value[0] ^ invert)
		new_bits = old_bits | bit;
	else
		new_bits = old_bits & ~bit;
	changed = new_bits != old_bits;
	if (changed)
		oxygen_write16(chip, OXYGEN_GPIO_DATA, new_bits);
	return changed;
}

Annotation

Implementation Notes