drivers/base/platform.c

Source file repositories/reference/linux-study-clean/drivers/base/platform.c

File Facts

System
Linux kernel
Corpus path
drivers/base/platform.c
Extension
.c
Size
40375 bytes
Lines
1562
Domain
Driver Families
Bucket
drivers/base
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern 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

const struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->suspend)
			ret = drv->pm->suspend(dev);
	} else {
		ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
	}

	return ret;
}

int platform_pm_resume(struct device *dev)
{
	const struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->resume)
			ret = drv->pm->resume(dev);
	} else {
		ret = platform_legacy_resume(dev);
	}

	return ret;
}

#endif /* CONFIG_SUSPEND */

#ifdef CONFIG_HIBERNATE_CALLBACKS

int platform_pm_freeze(struct device *dev)
{
	const struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->freeze)
			ret = drv->pm->freeze(dev);
	} else {
		ret = platform_legacy_suspend(dev, PMSG_FREEZE);
	}

	return ret;
}

int platform_pm_thaw(struct device *dev)
{
	const struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->thaw)
			ret = drv->pm->thaw(dev);
	} else {
		ret = platform_legacy_resume(dev);
	}

	return ret;
}

int platform_pm_poweroff(struct device *dev)
{
	const struct device_driver *drv = dev->driver;
	int ret = 0;

	if (!drv)
		return 0;

	if (drv->pm) {
		if (drv->pm->poweroff)
			ret = drv->pm->poweroff(dev);
	} else {
		ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
	}

	return ret;

Annotation

Implementation Notes