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1361a53c1a
Add a function to build up the ACPI path for a device and another for its scope. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Generation of tables for particular device types
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*
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* Copyright 2019 Google LLC
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* Mostly taken from coreboot file of the same name
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*/
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#ifndef __ACPI_DEVICE_H
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#define __ACPI_DEVICE_H
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struct udevice;
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/* Length of a full path to an ACPI device */
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#define ACPI_PATH_MAX 30
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/**
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* acpi_device_path() - Get the full path to an ACPI device
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*
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* This gets the full path in the form XXXX.YYYY.ZZZZ where XXXX is the root
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* and ZZZZ is the device. All parent devices are added to the path.
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*
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* @dev: Device to check
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* @buf: Buffer to place the path in (should be ACPI_PATH_MAX long)
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* @maxlen: Size of buffer (typically ACPI_PATH_MAX)
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* @return 0 if OK, -ve on error
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*/
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int acpi_device_path(const struct udevice *dev, char *buf, int maxlen);
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/**
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* acpi_device_scope() - Get the scope of an ACPI device
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*
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* This gets the scope which is the full path of the parent device, as per
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* acpi_device_path().
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*
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* @dev: Device to check
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* @buf: Buffer to place the path in (should be ACPI_PATH_MAX long)
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* @maxlen: Size of buffer (typically ACPI_PATH_MAX)
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* @return 0 if OK, -EINVAL if the device has no parent, other -ve on other
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* error
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*/
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int acpi_device_scope(const struct udevice *dev, char *scope, int maxlen);
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#endif
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