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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * Generation of tables for particular device types
- *
- * Copyright 2019 Google LLC
- * Mostly taken from coreboot file of the same name
- */
- #ifndef __ACPI_DEVICE_H
- #define __ACPI_DEVICE_H
- #include <linux/bitops.h>
- struct udevice;
- /* Length of a full path to an ACPI device */
- #define ACPI_PATH_MAX 30
- /* Values that can be returned for ACPI device _STA method */
- enum acpi_dev_status {
- ACPI_DSTATUS_PRESENT = BIT(0),
- ACPI_DSTATUS_ENABLED = BIT(1),
- ACPI_DSTATUS_SHOW_IN_UI = BIT(2),
- ACPI_DSTATUS_OK = BIT(3),
- ACPI_DSTATUS_HAS_BATTERY = BIT(4),
- ACPI_DSTATUS_ALL_OFF = 0,
- ACPI_DSTATUS_HIDDEN_ON = ACPI_DSTATUS_PRESENT | ACPI_DSTATUS_ENABLED |
- ACPI_DSTATUS_OK,
- ACPI_DSTATUS_ALL_ON = ACPI_DSTATUS_HIDDEN_ON |
- ACPI_DSTATUS_SHOW_IN_UI,
- };
- /**
- * acpi_device_path() - Get the full path to an ACPI device
- *
- * This gets the full path in the form XXXX.YYYY.ZZZZ where XXXX is the root
- * and ZZZZ is the device. All parent devices are added to the path.
- *
- * @dev: Device to check
- * @buf: Buffer to place the path in (should be ACPI_PATH_MAX long)
- * @maxlen: Size of buffer (typically ACPI_PATH_MAX)
- * @return 0 if OK, -ve on error
- */
- int acpi_device_path(const struct udevice *dev, char *buf, int maxlen);
- /**
- * acpi_device_scope() - Get the scope of an ACPI device
- *
- * This gets the scope which is the full path of the parent device, as per
- * acpi_device_path().
- *
- * @dev: Device to check
- * @buf: Buffer to place the path in (should be ACPI_PATH_MAX long)
- * @maxlen: Size of buffer (typically ACPI_PATH_MAX)
- * @return 0 if OK, -EINVAL if the device has no parent, other -ve on other
- * error
- */
- int acpi_device_scope(const struct udevice *dev, char *scope, int maxlen);
- /**
- * acpi_device_status() - Get the status of a device
- *
- * This currently just returns ACPI_DSTATUS_ALL_ON. It does not support
- * inactive or hidden devices.
- *
- * @dev: Device to check
- * @return device status, as ACPI_DSTATUS_...
- */
- enum acpi_dev_status acpi_device_status(const struct udevice *dev);
- #endif
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