drivers/regulator/virtual.c

File Facts

System

Linux kernel

Corpus path

drivers/regulator/virtual.c

Extension

.c

Size

9643 bytes

Lines

374

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.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• 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/err.h
• linux/mutex.h
• linux/platform_device.h
• linux/regulator/consumer.h
• linux/slab.h
• linux/module.h
• linux/of.h

Detected Declarations

• struct virtual_consumer_data
• function update_voltage_constraints
• function update_current_limit_constraints
• function show_min_uV
• function set_min_uV
• function show_max_uV
• function set_max_uV
• function show_min_uA
• function set_min_uA
• function show_max_uA
• function set_max_uA
• function show_mode
• function set_mode
• function regulator_virtual_probe
• function regulator_virtual_remove

Annotated Snippet

struct virtual_consumer_data {
	struct mutex lock;
	struct regulator *regulator;
	bool enabled;
	int min_uV;
	int max_uV;
	int min_uA;
	int max_uA;
	unsigned int mode;
};

static void update_voltage_constraints(struct device *dev,
				       struct virtual_consumer_data *data)
{
	int ret;

	if (data->min_uV && data->max_uV
	    && data->min_uV <= data->max_uV) {
		dev_dbg(dev, "Requesting %d-%duV\n",
			data->min_uV, data->max_uV);
		ret = regulator_set_voltage(data->regulator,
					data->min_uV, data->max_uV);
		if (ret != 0) {
			dev_err(dev,
				"regulator_set_voltage() failed: %d\n", ret);
			return;
		}
	}

	if (data->min_uV && data->max_uV && !data->enabled) {
		dev_dbg(dev, "Enabling regulator\n");
		ret = regulator_enable(data->regulator);
		if (ret == 0)
			data->enabled = true;
		else
			dev_err(dev, "regulator_enable() failed: %d\n",
				ret);
	}

	if (!(data->min_uV && data->max_uV) && data->enabled) {
		dev_dbg(dev, "Disabling regulator\n");
		ret = regulator_disable(data->regulator);
		if (ret == 0)
			data->enabled = false;
		else
			dev_err(dev, "regulator_disable() failed: %d\n",
				ret);
	}
}

static void update_current_limit_constraints(struct device *dev,
					  struct virtual_consumer_data *data)
{
	int ret;

	if (data->max_uA
	    && data->min_uA <= data->max_uA) {
		dev_dbg(dev, "Requesting %d-%duA\n",
			data->min_uA, data->max_uA);
		ret = regulator_set_current_limit(data->regulator,
					data->min_uA, data->max_uA);
		if (ret != 0) {
			dev_err(dev,
				"regulator_set_current_limit() failed: %d\n",
				ret);
			return;
		}
	}

	if (data->max_uA && !data->enabled) {
		dev_dbg(dev, "Enabling regulator\n");
		ret = regulator_enable(data->regulator);
		if (ret == 0)
			data->enabled = true;
		else
			dev_err(dev, "regulator_enable() failed: %d\n",
				ret);
	}

	if (!(data->min_uA && data->max_uA) && data->enabled) {
		dev_dbg(dev, "Disabling regulator\n");
		ret = regulator_disable(data->regulator);
		if (ret == 0)
			data->enabled = false;
		else
			dev_err(dev, "regulator_disable() failed: %d\n",
				ret);
	}
}

Annotation

• Immediate include surface: `linux/err.h`, `linux/mutex.h`, `linux/platform_device.h`, `linux/regulator/consumer.h`, `linux/slab.h`, `linux/module.h`, `linux/of.h`.
• Detected declarations: `struct virtual_consumer_data`, `function update_voltage_constraints`, `function update_current_limit_constraints`, `function show_min_uV`, `function set_min_uV`, `function show_max_uV`, `function set_max_uV`, `function show_min_uA`, `function set_min_uA`, `function show_max_uA`.
• Atlas domain: Driver Families / drivers/regulator.
• Implementation status: source implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.