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https://github.com/brain-hackers/u-boot-brain
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b38309b737
Put this in the context along with the other important pointers. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Core ACPI (Advanced Configuration and Power Interface) support
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*
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* Copyright 2019 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#ifndef __DM_ACPI_H__
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#define __DM_ACPI_H__
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/* Allow operations to be optional for ACPI */
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#if CONFIG_IS_ENABLED(ACPIGEN)
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#define ACPI_OPS_PTR(_ptr) .acpi_ops = _ptr,
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#else
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#define ACPI_OPS_PTR(_ptr)
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#endif
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/* Length of an ACPI name string, excluding nul terminator */
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#define ACPI_NAME_LEN 4
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/* Length of an ACPI name string including nul terminator */
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#define ACPI_NAME_MAX (ACPI_NAME_LEN + 1)
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#if !defined(__ACPI__)
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/**
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* struct acpi_ctx - Context used for writing ACPI tables
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*
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* This contains a few useful pieces of information used when writing
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*
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* @current: Current address for writing
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* @rsdp: Pointer to the Root System Description Pointer, typically used when
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* adding a new table. The RSDP holds pointers to the RSDT and XSDT.
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* @rsdt: Pointer to the Root System Description Table
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* @xsdt: Pointer to the Extended System Description Table
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*/
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struct acpi_ctx {
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void *current;
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struct acpi_rsdp *rsdp;
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struct acpi_rsdt *rsdt;
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struct acpi_xsdt *xsdt;
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};
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/**
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* struct acpi_ops - ACPI operations supported by driver model
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*/
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struct acpi_ops {
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/**
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* get_name() - Obtain the ACPI name of a device
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*
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* @dev: Device to check
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* @out_name: Place to put the name, must hold at least ACPI_NAME_MAX
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* bytes
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* @return 0 if OK, -ENOENT if no name is available, other -ve value on
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* other error
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*/
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int (*get_name)(const struct udevice *dev, char *out_name);
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/**
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* write_tables() - Write out any tables required by this device
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*
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* @dev: Device to write
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* @ctx: ACPI context to use
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* @return 0 if OK, -ve on error
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*/
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int (*write_tables)(const struct udevice *dev, struct acpi_ctx *ctx);
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};
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#define device_get_acpi_ops(dev) ((dev)->driver->acpi_ops)
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/**
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* acpi_get_name() - Obtain the ACPI name of a device
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*
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* @dev: Device to check
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* @out_name: Place to put the name, must hold at least ACPI_NAME_MAX
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* bytes
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* @return 0 if OK, -ENOENT if no name is available, other -ve value on
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* other error
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*/
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int acpi_get_name(const struct udevice *dev, char *out_name);
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/**
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* acpi_copy_name() - Copy an ACPI name to an output buffer
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*
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* This convenience function can be used to return a literal string as a name
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* in functions that implement the get_name() method.
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*
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* For example:
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*
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* static int mydev_get_name(const struct udevice *dev, char *out_name)
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* {
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* return acpi_copy_name(out_name, "WIBB");
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* }
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*
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* @out_name: Place to put the name
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* @name: Name to copy
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* @return 0 (always)
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*/
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int acpi_copy_name(char *out_name, const char *name);
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/**
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* acpi_write_dev_tables() - Write ACPI tables required by devices
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*
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* This scans through all devices and tells them to write any tables they want
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* to write.
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*
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* @return 0 if OK, -ve if any device returned an error
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*/
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int acpi_write_dev_tables(struct acpi_ctx *ctx);
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#endif /* __ACPI__ */
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#endif
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