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ACPI: Add _PLD support

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Add a simple helper function to allow drivers to obtain the physical
device location data.

Acked-by: Len Brown <[email protected]>
Signed-off-by: Matthew Garrett <[email protected]>
Signed-off-by: Lan Tianyu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Matthew Garrett 2012-05-11 16:08:26 +08:00 • committed by Greg Kroah-Hartman
commit 38ac0f1b90
2 changed files with 61 additions and 0 deletions
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30
drivers/acpi/utils.c
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@ -382,3 +382,33 @@ acpi_evaluate_reference(acpi_handle handle,
}
EXPORT_SYMBOL(acpi_evaluate_reference);
acpi_status
acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld *pld)
{
acpi_status status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *output;
status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer);
if (ACPI_FAILURE(status))
return status;
output = buffer.pointer;
if (!output || output->type != ACPI_TYPE_PACKAGE
|| !output->package.count
|| output->package.elements[0].type != ACPI_TYPE_BUFFER
|| output->package.elements[0].buffer.length > sizeof(*pld)) {
status = AE_TYPE;
goto out;
}
memcpy(pld, output->package.elements[0].buffer.pointer,
output->package.elements[0].buffer.length);
out:
kfree(buffer.pointer);
return status;
}
EXPORT_SYMBOL(acpi_get_physical_device_location);