drivers/regulator/sun20i-regulator.c

Source file repositories/reference/linux-study-clean/drivers/regulator/sun20i-regulator.c

File Facts

System
Linux kernel
Corpus path
drivers/regulator/sun20i-regulator.c
Extension
.c
Size
4017 bytes
Lines
158
Domain
Driver Families
Bucket
drivers/regulator
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 sun20i_regulator_data {
	const struct regulator_desc	*descs;
	unsigned int			ndescs;
};

/* regulator_list_voltage_linear() modified for the non-integral uV_step. */
static int sun20i_d1_system_ldo_list_voltage(struct regulator_dev *rdev,
					     unsigned int selector)
{
	const struct regulator_desc *desc = rdev->desc;
	unsigned int fraction, uV;

	if (selector >= desc->n_voltages)
		return -EINVAL;

	uV = desc->min_uV + (desc->uV_step * selector);
	fraction = selector + (desc->min_uV % 4);

	if (uV > 1606667)
		uV += 6667;
	else
		fraction++;

	/* Produce correctly-rounded absolute voltages. */
	return uV + (fraction / 3);
}

static const struct regulator_ops sun20i_d1_system_ldo_ops = {
	.list_voltage		= sun20i_d1_system_ldo_list_voltage,
	.map_voltage		= regulator_map_voltage_ascend,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
};

static const struct regulator_desc sun20i_d1_system_ldo_descs[] = {
	{
		.name		= "ldoa",
		.supply_name	= "ldo-in",
		.of_match	= "ldoa",
		.ops		= &sun20i_d1_system_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.n_voltages	= 32,
		.min_uV		= 1593333,
		.uV_step	= 13333, /* repeating */
		.vsel_reg	= SUN20I_SYS_LDO_CTRL_REG,
		.vsel_mask	= GENMASK(7, 0),
	},
	{
		.name		= "ldob",
		.supply_name	= "ldo-in",
		.of_match	= "ldob",
		.ops		= &sun20i_d1_system_ldo_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.n_voltages	= 64,
		.min_uV		= 1166666,
		.uV_step	= 13333, /* repeating */
		.vsel_reg	= SUN20I_SYS_LDO_CTRL_REG,
		.vsel_mask	= GENMASK(15, 8),
	},
};

static const struct sun20i_regulator_data sun20i_d1_system_ldos = {
	.descs	= sun20i_d1_system_ldo_descs,
	.ndescs	= ARRAY_SIZE(sun20i_d1_system_ldo_descs),
};

static struct regmap *sun20i_regulator_get_regmap(struct device *dev)
{
	struct regmap *regmap;

	/*
	 * First try the syscon interface. The system control device is not
	 * compatible with "syscon", so fall back to getting the regmap from
	 * its platform device. This is ugly, but required for devicetree
	 * backward compatibility.
	 */
	regmap = syscon_node_to_regmap(dev->parent->of_node);
	if (!IS_ERR(regmap))
		return regmap;

	regmap = dev_get_regmap(dev->parent, NULL);
	if (regmap)
		return regmap;

	return ERR_PTR(-EPROBE_DEFER);
}

static int sun20i_regulator_probe(struct platform_device *pdev)

Annotation

Implementation Notes