1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Core ACPI (Advanced Configuration and Power Interface) support
5 * Copyright 2019 Google LLC
6 * Written by Simon Glass <sjg@chromium.org>
12 /* Allow operations to be optional for ACPI */
13 #if CONFIG_IS_ENABLED(ACPIGEN)
14 #define ACPI_OPS_PTR(_ptr) .acpi_ops = _ptr,
16 #define ACPI_OPS_PTR(_ptr)
19 /* Length of an ACPI name string, excluding nul terminator */
20 #define ACPI_NAME_LEN 4
22 /* Length of an ACPI name string including nul terminator */
23 #define ACPI_NAME_MAX (ACPI_NAME_LEN + 1)
25 #if !defined(__ACPI__)
28 * struct acpi_ops - ACPI operations supported by driver model
32 * get_name() - Obtain the ACPI name of a device
34 * @dev: Device to check
35 * @out_name: Place to put the name, must hold at least ACPI_NAME_MAX
37 * @return 0 if OK, -ENOENT if no name is available, other -ve value on
40 int (*get_name)(const struct udevice *dev, char *out_name);
43 #define device_get_acpi_ops(dev) ((dev)->driver->acpi_ops)
46 * acpi_get_name() - Obtain the ACPI name of a device
48 * @dev: Device to check
49 * @out_name: Place to put the name, must hold at least ACPI_NAME_MAX
51 * @return 0 if OK, -ENOENT if no name is available, other -ve value on
54 int acpi_get_name(const struct udevice *dev, char *out_name);
57 * acpi_copy_name() - Copy an ACPI name to an output buffer
59 * This convenience function can be used to return a literal string as a name
60 * in functions that implement the get_name() method.
64 * static int mydev_get_name(const struct udevice *dev, char *out_name)
66 * return acpi_copy_name(out_name, "WIBB");
69 * @out_name: Place to put the name
73 int acpi_copy_name(char *out_name, const char *name);