drivers/pnp/pnpacpi/core.c

Source file repositories/reference/linux-study-clean/drivers/pnp/pnpacpi/core.c

File Facts

System
Linux kernel
Corpus path
drivers/pnp/pnpacpi/core.c
Extension
.c
Size
7559 bytes
Lines
326
Domain
Driver Families
Bucket
drivers/pnp
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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

if (!ret) {
			acpi_status status;

			status = acpi_set_current_resources(handle, &buffer);
			if (ACPI_FAILURE(status))
				ret = -EIO;
		}
		kfree(buffer.pointer);
	}
	if (!ret && acpi_device_power_manageable(acpi_dev))
		ret = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);

	return ret;
}

static int pnpacpi_disable_resources(struct pnp_dev *dev)
{
	struct acpi_device *acpi_dev;
	acpi_status status;

	dev_dbg(&dev->dev, "disable resources\n");

	acpi_dev = ACPI_COMPANION(&dev->dev);
	if (!acpi_dev) {
		dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
		return 0;
	}

	/* acpi_unregister_gsi(pnp_irq(dev, 0)); */
	if (acpi_device_power_manageable(acpi_dev))
		acpi_device_set_power(acpi_dev, ACPI_STATE_D3_COLD);

	/* continue even if acpi_device_set_power() fails */
	status = acpi_evaluate_object(acpi_dev->handle, "_DIS", NULL, NULL);
	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
		return -ENODEV;

	return 0;
}

#ifdef CONFIG_ACPI_SLEEP
static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
{
	struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);

	if (!acpi_dev) {
		dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
		return false;
	}

	return acpi_bus_can_wakeup(acpi_dev->handle);
}

static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
{
	struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
	int error = 0;

	if (!acpi_dev) {
		dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
		return 0;
	}

	if (device_can_wakeup(&dev->dev)) {
		error = acpi_pm_set_device_wakeup(&dev->dev,
					      device_may_wakeup(&dev->dev));
		if (error)
			return error;
	}

	if (acpi_device_power_manageable(acpi_dev)) {
		int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
							ACPI_STATE_D3_COLD);
		if (power_state < 0)
			power_state = (state.event == PM_EVENT_ON) ?
					ACPI_STATE_D0 : ACPI_STATE_D3_COLD;

		/*
		 * acpi_device_set_power() can fail (keyboard port can't be
		 * powered-down?), and in any case, our return value is ignored
		 * by pnp_bus_suspend().  Hence we don't revert the wakeup
		 * setting if the set_power fails.
		 */
		error = acpi_device_set_power(acpi_dev, power_state);
	}

	return error;
}

static int pnpacpi_resume(struct pnp_dev *dev)

Annotation

Implementation Notes