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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Core ACPI (Advanced Configuration and Power Interface) support
*
* Copyright 2019 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#ifndef __DM_ACPI_H__
#define __DM_ACPI_H__
/* Allow operations to be optional for ACPI */
#if CONFIG_IS_ENABLED(ACPIGEN)
#define ACPI_OPS_PTR(_ptr) .acpi_ops = _ptr,
#else
#define ACPI_OPS_PTR(_ptr)
#endif
/* Length of an ACPI name string, excluding nul terminator */
#define ACPI_NAME_LEN 4
/* Length of an ACPI name string including nul terminator */
#define ACPI_NAME_MAX (ACPI_NAME_LEN + 1)
#if !defined(__ACPI__)
/**
* struct acpi_ctx - Context used for writing ACPI tables
*
* This contains a few useful pieces of information used when writing
*
* @current: Current address for writing
* @rsdp: Pointer to the Root System Description Pointer, typically used when
* adding a new table. The RSDP holds pointers to the RSDT and XSDT.
* @rsdt: Pointer to the Root System Description Table
* @xsdt: Pointer to the Extended System Description Table
*/
struct acpi_ctx {
void *current;
struct acpi_rsdp *rsdp;
struct acpi_rsdt *rsdt;
struct acpi_xsdt *xsdt;
};
/**
* struct acpi_ops - ACPI operations supported by driver model
*/
struct acpi_ops {
/**
* get_name() - Obtain the ACPI name of a device
*
* @dev: Device to check
* @out_name: Place to put the name, must hold at least ACPI_NAME_MAX
* bytes
* @return 0 if OK, -ENOENT if no name is available, other -ve value on
* other error
*/
int (*get_name)(const struct udevice *dev, char *out_name);
/**
* write_tables() - Write out any tables required by this device
*
* @dev: Device to write
* @ctx: ACPI context to use
* @return 0 if OK, -ve on error
*/
int (*write_tables)(const struct udevice *dev, struct acpi_ctx *ctx);
};
#define device_get_acpi_ops(dev) ((dev)->driver->acpi_ops)
/**
* acpi_get_name() - Obtain the ACPI name of a device
*
* @dev: Device to check
* @out_name: Place to put the name, must hold at least ACPI_NAME_MAX
* bytes
* @return 0 if OK, -ENOENT if no name is available, other -ve value on
* other error
*/
int acpi_get_name(const struct udevice *dev, char *out_name);
/**
* acpi_copy_name() - Copy an ACPI name to an output buffer
*
* This convenience function can be used to return a literal string as a name
* in functions that implement the get_name() method.
*
* For example:
*
* static int mydev_get_name(const struct udevice *dev, char *out_name)
* {
* return acpi_copy_name(out_name, "WIBB");
* }
*
* @out_name: Place to put the name
* @name: Name to copy
* @return 0 (always)
*/
int acpi_copy_name(char *out_name, const char *name);
/**
* acpi_write_dev_tables() - Write ACPI tables required by devices
*
* This scans through all devices and tells them to write any tables they want
* to write.
*
* @return 0 if OK, -ve if any device returned an error
*/
int acpi_write_dev_tables(struct acpi_ctx *ctx);
#endif /* __ACPI__ */
#endif
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