drivers/regulator/fixed-helper.c

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

File Facts

System
Linux kernel
Corpus path
drivers/regulator/fixed-helper.c
Extension
.c
Size
1743 bytes
Lines
64
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 fixed_regulator_data {
	struct fixed_voltage_config cfg;
	struct regulator_init_data init_data;
	struct platform_device pdev;
};

static void regulator_fixed_release(struct device *dev)
{
	struct fixed_regulator_data *data = container_of(dev,
			struct fixed_regulator_data, pdev.dev);
	kfree_const(data->cfg.supply_name);
	kfree(data);
}

/**
 * regulator_register_always_on - register an always-on regulator with a fixed name
 * @id: platform device id
 * @name: name to be used for the regulator
 * @supplies: consumers for this regulator
 * @num_supplies: number of consumers
 * @uv: voltage in microvolts
 *
 * Return: Pointer to registered platform device, or %NULL if memory allocation fails.
 */
struct platform_device *regulator_register_always_on(int id, const char *name,
	struct regulator_consumer_supply *supplies, int num_supplies, int uv)
{
	struct fixed_regulator_data *data;

	data = kzalloc_obj(*data);
	if (!data)
		return NULL;

	data->cfg.supply_name = kstrdup_const(name, GFP_KERNEL);
	if (!data->cfg.supply_name) {
		kfree(data);
		return NULL;
	}

	data->cfg.microvolts = uv;
	data->cfg.enabled_at_boot = 1;
	data->cfg.init_data = &data->init_data;

	data->init_data.constraints.always_on = 1;
	data->init_data.consumer_supplies = supplies;
	data->init_data.num_consumer_supplies = num_supplies;

	data->pdev.name = "reg-fixed-voltage";
	data->pdev.id = id;
	data->pdev.dev.platform_data = &data->cfg;
	data->pdev.dev.release = regulator_fixed_release;

	platform_device_register(&data->pdev);

	return &data->pdev;
}

Annotation

Implementation Notes