drivers/regulator/aw37503-regulator.c

Source file repositories/reference/linux-study-clean/drivers/regulator/aw37503-regulator.c

File Facts

System
Linux kernel
Corpus path
drivers/regulator/aw37503-regulator.c
Extension
.c
Size
6352 bytes
Lines
241
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 aw37503_reg_pdata {
	struct gpio_desc *en_gpiod;
	int ena_gpio_state;
};

struct aw37503_regulator {
	struct device *dev;
	struct aw37503_reg_pdata reg_pdata[AW37503_MAX_REGULATORS];
};

static int aw37503_regulator_enable(struct regulator_dev *rdev)
{
	struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
	int ret;

	if (!IS_ERR(rpdata->en_gpiod)) {
		gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
		rpdata->ena_gpio_state = 1;
	}

	/* Hardware automatically enable discharge bit in enable */
	if (rdev->constraints->active_discharge ==
			REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
		ret = regulator_set_active_discharge_regmap(rdev, false);
		if (ret < 0) {
			dev_err(chip->dev, "Failed to disable active discharge: %d\n",
				ret);
			return ret;
		}
	}

	return 0;
}

static int aw37503_regulator_disable(struct regulator_dev *rdev)
{
	struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];

	if (!IS_ERR(rpdata->en_gpiod)) {
		gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
		rpdata->ena_gpio_state = 0;
	}

	return 0;
}

static int aw37503_regulator_is_enabled(struct regulator_dev *rdev)
{
	struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);
	struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];

	if (!IS_ERR(rpdata->en_gpiod))
		return rpdata->ena_gpio_state;

	return 1;
}

static const struct regulator_ops aw37503_regulator_ops = {
	.enable = aw37503_regulator_enable,
	.disable = aw37503_regulator_disable,
	.is_enabled = aw37503_regulator_is_enabled,
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.set_active_discharge = regulator_set_active_discharge_regmap,
};

static int aw37503_of_parse_cb(struct device_node *np,
				const struct regulator_desc *desc,
				struct regulator_config *config)
{
	struct aw37503_regulator *chip = config->driver_data;
	struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[desc->id];
	int ret;

	rpdata->en_gpiod = devm_fwnode_gpiod_get(chip->dev, of_fwnode_handle(np),
						 "enable", GPIOD_OUT_LOW,
						 "enable");

	if (IS_ERR(rpdata->en_gpiod)) {
		ret = PTR_ERR(rpdata->en_gpiod);

		/* Ignore the error other than probe defer */
		if (ret == -EPROBE_DEFER)

Annotation

Implementation Notes