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.
- 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.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/slab.hlinux/string.hlinux/platform_device.hlinux/regulator/machine.hlinux/regulator/fixed.h
Detected Declarations
struct fixed_regulator_datafunction regulator_fixed_release
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
- Immediate include surface: `linux/slab.h`, `linux/string.h`, `linux/platform_device.h`, `linux/regulator/machine.h`, `linux/regulator/fixed.h`.
- Detected declarations: `struct fixed_regulator_data`, `function regulator_fixed_release`.
- Atlas domain: Driver Families / drivers/regulator.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.