drivers/regulator/sy7636a-regulator.c

Source file repositories/reference/linux-study-clean/drivers/regulator/sy7636a-regulator.c

File Facts

System
Linux kernel
Corpus path
drivers/regulator/sy7636a-regulator.c
Extension
.c
Size
4575 bytes
Lines
168
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 sy7636a_data {
	struct regmap *regmap;
	struct gpio_desc *pgood_gpio;
	struct gpio_desc *en_gpio;
	struct gpio_desc *vcom_en_gpio;
};

static int sy7636a_get_vcom_voltage_op(struct regulator_dev *rdev)
{
	int ret;
	unsigned int val, val_h;

	ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val);
	if (ret)
		return ret;

	ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h);
	if (ret)
		return ret;

	val |= (val_h << VCOM_ADJUST_CTRL_SHIFT);

	return (val & VCOM_ADJUST_CTRL_MASK) * VCOM_ADJUST_CTRL_SCAL;
}

static int sy7636a_get_status(struct regulator_dev *rdev)
{
	struct sy7636a_data *data = dev_get_drvdata(rdev->dev.parent);
	int ret = 0;

	ret = gpiod_get_value_cansleep(data->pgood_gpio);
	if (ret < 0)
		dev_err(&rdev->dev, "Failed to read pgood gpio: %d\n", ret);

	return ret;
}

static const struct regulator_ops sy7636a_vcom_volt_ops = {
	.get_voltage = sy7636a_get_vcom_voltage_op,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.get_status = sy7636a_get_status,
};

static const struct regulator_desc desc = {
	.name = "vcom",
	.id = 0,
	.ops = &sy7636a_vcom_volt_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	.enable_reg = SY7636A_REG_OPERATION_MODE_CRL,
	.enable_mask = SY7636A_OPERATION_MODE_CRL_ONOFF,
	.regulators_node = of_match_ptr("regulators"),
	.of_match = of_match_ptr("vcom"),
};

static int sy7636a_regulator_probe(struct platform_device *pdev)
{
	struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL);
	struct regulator_config config = { };
	struct regulator_dev *rdev;
	struct gpio_desc *gdp;
	struct sy7636a_data *data;
	int ret;

	if (!regmap)
		return -EPROBE_DEFER;

	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);

	gdp = devm_gpiod_get(&pdev->dev, "epd-pwr-good", GPIOD_IN);
	if (IS_ERR(gdp)) {
		dev_err(&pdev->dev, "Power good GPIO fault %ld\n", PTR_ERR(gdp));
		return PTR_ERR(gdp);
	}

	data = devm_kzalloc(&pdev->dev, sizeof(struct sy7636a_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->regmap = regmap;
	data->pgood_gpio = gdp;

	ret = devm_regulator_get_enable_optional(&pdev->dev, "vin");
	if (ret)
		return dev_err_probe(&pdev->dev, ret,
				     "failed to get vin regulator\n");

	data->en_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",

Annotation

Implementation Notes