Release 4.16 include/linux/fwnode.h

/*
 * fwnode.h - Firmware device node object handle type definition.
 *
 * Copyright (C) 2015, Intel Corporation
 * Author: Rafael J. Wysocki <rafael.j.wysocki@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 _LINUX_FWNODE_H_

#define _LINUX_FWNODE_H_

#include <linux/types.h>

struct fwnode_operations;
struct device;


struct fwnode_handle {
	
struct fwnode_handle *secondary;
	
const struct fwnode_operations *ops;
};

/**
 * struct fwnode_endpoint - Fwnode graph endpoint
 * @port: Port number
 * @id: Endpoint id
 * @local_fwnode: reference to the related fwnode
 */

struct fwnode_endpoint {
	
unsigned int port;
	
unsigned int id;
	
const struct fwnode_handle *local_fwnode;
};


#define NR_FWNODE_REFERENCE_ARGS	8

/**
 * struct fwnode_reference_args - Fwnode reference with additional arguments
 * @fwnode:- A reference to the base fwnode
 * @nargs: Number of elements in @args array
 * @args: Integer arguments on the fwnode
 */

struct fwnode_reference_args {
	
struct fwnode_handle *fwnode;
	
unsigned int nargs;
	
unsigned int args[NR_FWNODE_REFERENCE_ARGS];
};

/**
 * struct fwnode_operations - Operations for fwnode interface
 * @get: Get a reference to an fwnode.
 * @put: Put a reference to an fwnode.
 * @device_get_match_data: Return the device driver match data.
 * @property_present: Return true if a property is present.
 * @property_read_integer_array: Read an array of integer properties. Return
 *                               zero on success, a negative error code
 *                               otherwise.
 * @property_read_string_array: Read an array of string properties. Return zero
 *                              on success, a negative error code otherwise.
 * @get_parent: Return the parent of an fwnode.
 * @get_next_child_node: Return the next child node in an iteration.
 * @get_named_child_node: Return a child node with a given name.
 * @get_reference_args: Return a reference pointed to by a property, with args
 * @graph_get_next_endpoint: Return an endpoint node in an iteration.
 * @graph_get_remote_endpoint: Return the remote endpoint node of a local
 *                             endpoint node.
 * @graph_get_port_parent: Return the parent node of a port node.
 * @graph_parse_endpoint: Parse endpoint for port and endpoint id.
 */

struct fwnode_operations {
	
struct fwnode_handle *(*get)(struct fwnode_handle *fwnode);
	
void (*put)(struct fwnode_handle *fwnode);
	
bool (*device_is_available)(const struct fwnode_handle *fwnode);
	
const void *(*device_get_match_data)(const struct fwnode_handle *fwnode,
					     const struct device *dev);
	
bool (*property_present)(const struct fwnode_handle *fwnode,
				 const char *propname);
	
int (*property_read_int_array)(const struct fwnode_handle *fwnode,
				       const char *propname,
				       unsigned int elem_size, void *val,
				       size_t nval);
	int
	
(*property_read_string_array)(const struct fwnode_handle *fwnode_handle,
				      const char *propname, const char **val,
				      size_t nval);
	
struct fwnode_handle *(*get_parent)(const struct fwnode_handle *fwnode);
	struct fwnode_handle *
	
(*get_next_child_node)(const struct fwnode_handle *fwnode,
			       struct fwnode_handle *child);
	struct fwnode_handle *
	
(*get_named_child_node)(const struct fwnode_handle *fwnode,
				const char *name);
	
int (*get_reference_args)(const struct fwnode_handle *fwnode,
				  const char *prop, const char *nargs_prop,
				  unsigned int nargs, unsigned int index,
				  struct fwnode_reference_args *args);
	struct fwnode_handle *
	
(*graph_get_next_endpoint)(const struct fwnode_handle *fwnode,
				   struct fwnode_handle *prev);
	struct fwnode_handle *
	
(*graph_get_remote_endpoint)(const struct fwnode_handle *fwnode);
	struct fwnode_handle *
	
(*graph_get_port_parent)(struct fwnode_handle *fwnode);
	
int (*graph_parse_endpoint)(const struct fwnode_handle *fwnode,
				    struct fwnode_endpoint *endpoint);
};


#define fwnode_has_op(fwnode, op)				\
	((fwnode) && (fwnode)->ops && (fwnode)->ops->op)

#define fwnode_call_int_op(fwnode, op, ...)				\
	(fwnode ? (fwnode_has_op(fwnode, op) ?                          \
                   (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : -ENXIO) : \
         -EINVAL)

#define fwnode_call_bool_op(fwnode, op, ...)				\
	(fwnode ? (fwnode_has_op(fwnode, op) ?                          \
                   (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : false) : \
         false)

#define fwnode_call_ptr_op(fwnode, op, ...)		\
	(fwnode_has_op(fwnode, op) ?                    \
         (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : NULL)

#define fwnode_call_void_op(fwnode, op, ...)				\
	do {                                                            \
                if (fwnode_has_op(fwnode, op))                          \
                        (fwnode)->ops->op(fwnode, ## __VA_ARGS__);      \
        } while (false)

#endif
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Sakari Ailus
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Rafael J. Wysocki
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Directory: include/linux

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