Commit daae45ca authored Jul 28, 2016 by Lukas Wunner Committed by Rafael J. Wysocki Aug 31, 2016

ACPI / bus: Make acpi_get_first_physical_node() public



Following the fwnode of a device is currently a one-way road: We provide
ACPI_COMPANION() to obtain the fwnode but there's no (public) method to
do the reverse. Granted, there may be multiple physical_nodes, but often
the first one in the list is sufficient.

A handy function to obtain it was introduced with commit 3b95bd16
("ACPI: introduce a function to find the first physical device"), but
currently it's only available internally.

We're about to add an EFI Device Path parser which needs this function.
Consider the following device path: ACPI(PNP0A03,0)/PCI(28,2)/PCI(0,0)
The PCI root is encoded as an ACPI device in the path, so the parser
has to find the corresponding ACPI device, then find its physical node,
find the PCI bridge in slot 1c (decimal 28), function 2 below it and
finally find the PCI device in slot 0, function 0.

To this end, make acpi_get_first_physical_node() public.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 3eab887a

drivers/acpi/internal.h

+0 −1

Original line number	Diff line number	Diff line
		@@ -116,7 +116,6 @@ bool acpi_device_is_present(struct acpi_device *adev);
		bool acpi_device_is_battery(struct acpi_device *adev);
		bool acpi_device_is_first_physical_node(struct acpi_device *adev,
		const struct device *dev);
		struct device acpi_get_first_physical_node(struct acpi_device adev);

		/* --------------------------------------------------------------------------
		Device Matching and Notification

include/linux/acpi.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -85,6 +85,8 @@ static inline const char acpi_dev_name(struct acpi_device adev)
		return dev_name(&adev->dev);
		}

		struct device acpi_get_first_physical_node(struct acpi_device adev);

		enum acpi_irq_model_id {
		ACPI_IRQ_MODEL_PIC = 0,
		ACPI_IRQ_MODEL_IOAPIC,
		@@ -634,6 +636,11 @@ static inline const char acpi_dev_name(struct acpi_device adev)
		return NULL;
		}

		static inline struct device acpi_get_first_physical_node(struct acpi_device adev)
		{
		return NULL;
		}

		static inline void acpi_early_init(void) { }
		static inline void acpi_subsystem_init(void) { }

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