sound/pci/ice1712/ak4xxx.c

Source file repositories/reference/linux-study-clean/sound/pci/ice1712/ak4xxx.c

File Facts

System
Linux kernel
Corpus path
sound/pci/ice1712/ak4xxx.c
Extension
.c
Size
4135 bytes
Lines
171
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 (priv->cif) {
			tmp |= priv->cs_mask; /* start without chip select */
		}  else {
			tmp &= ~priv->cs_mask; /* chip select low */
			snd_ice1712_gpio_write(ice, tmp);
			udelay(1);
		}
	} else {
		/* doesn't handle cf=1 yet */
		tmp &= ~priv->cs_mask;
		tmp |= priv->cs_addr;
		snd_ice1712_gpio_write(ice, tmp);
		udelay(1);
	}

	/* build I2C address + data byte */
	addrdata = (priv->caddr << 6) | 0x20 | (addr & 0x1f);
	addrdata = (addrdata << 8) | data;
	for (idx = 15; idx >= 0; idx--) {
		/* drop clock */
		tmp &= ~priv->clk_mask;
		snd_ice1712_gpio_write(ice, tmp);
		udelay(1);
		/* set data */
		if (addrdata & (1 << idx))
			tmp |= priv->data_mask;
		else
			tmp &= ~priv->data_mask;
		snd_ice1712_gpio_write(ice, tmp);
		udelay(1);
		/* raise clock */
		tmp |= priv->clk_mask;
		snd_ice1712_gpio_write(ice, tmp);
		udelay(1);
	}

	if (priv->cs_mask == priv->cs_addr) {
		if (priv->cif) {
			/* assert a cs pulse to trigger */
			tmp &= ~priv->cs_mask;
			snd_ice1712_gpio_write(ice, tmp);
			udelay(1);
		}
		tmp |= priv->cs_mask; /* chip select high to trigger */
	} else {
		tmp &= ~priv->cs_mask;
		tmp |= priv->cs_none; /* deselect address */
	}
	snd_ice1712_gpio_write(ice, tmp);
	udelay(1);
}

/*
 * initialize the struct snd_akm4xxx record with the template
 */
int snd_ice1712_akm4xxx_init(struct snd_akm4xxx *ak, const struct snd_akm4xxx *temp,
			     const struct snd_ak4xxx_private *_priv, struct snd_ice1712 *ice)
{
	struct snd_ak4xxx_private *priv;

	if (_priv != NULL) {
		priv = kmalloc_obj(*priv);
		if (priv == NULL)
			return -ENOMEM;
		*priv = *_priv;
	} else {
		priv = NULL;
	}
	*ak = *temp;
	ak->card = ice->card;
        ak->private_value[0] = (unsigned long)priv;
	ak->private_data[0] = ice;
	if (ak->ops.lock == NULL)
		ak->ops.lock = snd_ice1712_akm4xxx_lock;
	if (ak->ops.unlock == NULL)
		ak->ops.unlock = snd_ice1712_akm4xxx_unlock;
	if (ak->ops.write == NULL)
		ak->ops.write = snd_ice1712_akm4xxx_write;
	snd_akm4xxx_init(ak);
	return 0;
}

void snd_ice1712_akm4xxx_free(struct snd_ice1712 *ice)
{
	unsigned int akidx;
	if (ice->akm == NULL)
		return;
	for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
		struct snd_akm4xxx *ak = &ice->akm[akidx];
		kfree((void*)ak->private_value[0]);

Annotation

Implementation Notes