include/linux/thunderbolt.h

/*
 * Thunderbolt service API
 *
 * Copyright (C) 2017, Intel Corporation
 * Authors: Michael Jamet <michael.jamet@intel.com>
 *          Mika Westerberg <mika.westerberg@linux.intel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef THUNDERBOLT_H_
#define THUNDERBOLT_H_

#include <linux/list.h>
#include <linux/uuid.h>

/**
 * struct tb_property_dir - XDomain property directory
 * @uuid: Directory UUID or %NULL if root directory
 * @properties: List of properties in this directory
 *
 * User needs to provide serialization if needed.
 */
struct tb_property_dir {
	const uuid_t *uuid;
	struct list_head properties;
};

enum tb_property_type {
	TB_PROPERTY_TYPE_UNKNOWN = 0x00,
	TB_PROPERTY_TYPE_DIRECTORY = 0x44,
	TB_PROPERTY_TYPE_DATA = 0x64,
	TB_PROPERTY_TYPE_TEXT = 0x74,
	TB_PROPERTY_TYPE_VALUE = 0x76,
};

#define TB_PROPERTY_KEY_SIZE	8

/**
 * struct tb_property - XDomain property
 * @list: Used to link properties together in a directory
 * @key: Key for the property (always terminated).
 * @type: Type of the property
 * @length: Length of the property data in dwords
 * @value: Property value
 *
 * Users use @type to determine which field in @value is filled.
 */
struct tb_property {
	struct list_head list;
	char key[TB_PROPERTY_KEY_SIZE + 1];
	enum tb_property_type type;
	size_t length;
	union {
		struct tb_property_dir *dir;
		u8 *data;
		char *text;
		u32 immediate;
	} value;
};

struct tb_property_dir *tb_property_parse_dir(const u32 *block,
					      size_t block_len);
ssize_t tb_property_format_dir(const struct tb_property_dir *dir, u32 *block,
			       size_t block_len);
struct tb_property_dir *tb_property_create_dir(const uuid_t *uuid);
void tb_property_free_dir(struct tb_property_dir *dir);
int tb_property_add_immediate(struct tb_property_dir *parent, const char *key,
			      u32 value);
int tb_property_add_data(struct tb_property_dir *parent, const char *key,
			 const void *buf, size_t buflen);
int tb_property_add_text(struct tb_property_dir *parent, const char *key,
			 const char *text);
int tb_property_add_dir(struct tb_property_dir *parent, const char *key,
			struct tb_property_dir *dir);
void tb_property_remove(struct tb_property *tb_property);
struct tb_property *tb_property_find(struct tb_property_dir *dir,
			const char *key, enum tb_property_type type);
struct tb_property *tb_property_get_next(struct tb_property_dir *dir,
					 struct tb_property *prev);

#define tb_property_for_each(dir, property)			\
	for (property = tb_property_get_next(dir, NULL);	\
	     property;						\
	     property = tb_property_get_next(dir, property))

#endif /* THUNDERBOLT_H_ */