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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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