linux/include/linux/fwnode.h
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   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * fwnode.h - Firmware device node object handle type definition.
   4 *
   5 * Copyright (C) 2015, Intel Corporation
   6 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
   7 */
   8
   9#ifndef _LINUX_FWNODE_H_
  10#define _LINUX_FWNODE_H_
  11
  12#include <linux/types.h>
  13
  14struct fwnode_operations;
  15struct device;
  16
  17struct fwnode_handle {
  18        struct fwnode_handle *secondary;
  19        const struct fwnode_operations *ops;
  20};
  21
  22/**
  23 * struct fwnode_endpoint - Fwnode graph endpoint
  24 * @port: Port number
  25 * @id: Endpoint id
  26 * @local_fwnode: reference to the related fwnode
  27 */
  28struct fwnode_endpoint {
  29        unsigned int port;
  30        unsigned int id;
  31        const struct fwnode_handle *local_fwnode;
  32};
  33
  34#define NR_FWNODE_REFERENCE_ARGS        8
  35
  36/**
  37 * struct fwnode_reference_args - Fwnode reference with additional arguments
  38 * @fwnode:- A reference to the base fwnode
  39 * @nargs: Number of elements in @args array
  40 * @args: Integer arguments on the fwnode
  41 */
  42struct fwnode_reference_args {
  43        struct fwnode_handle *fwnode;
  44        unsigned int nargs;
  45        u64 args[NR_FWNODE_REFERENCE_ARGS];
  46};
  47
  48/**
  49 * struct fwnode_operations - Operations for fwnode interface
  50 * @get: Get a reference to an fwnode.
  51 * @put: Put a reference to an fwnode.
  52 * @device_get_match_data: Return the device driver match data.
  53 * @property_present: Return true if a property is present.
  54 * @property_read_integer_array: Read an array of integer properties. Return
  55 *                               zero on success, a negative error code
  56 *                               otherwise.
  57 * @property_read_string_array: Read an array of string properties. Return zero
  58 *                              on success, a negative error code otherwise.
  59 * @get_parent: Return the parent of an fwnode.
  60 * @get_next_child_node: Return the next child node in an iteration.
  61 * @get_named_child_node: Return a child node with a given name.
  62 * @get_reference_args: Return a reference pointed to by a property, with args
  63 * @graph_get_next_endpoint: Return an endpoint node in an iteration.
  64 * @graph_get_remote_endpoint: Return the remote endpoint node of a local
  65 *                             endpoint node.
  66 * @graph_get_port_parent: Return the parent node of a port node.
  67 * @graph_parse_endpoint: Parse endpoint for port and endpoint id.
  68 */
  69struct fwnode_operations {
  70        struct fwnode_handle *(*get)(struct fwnode_handle *fwnode);
  71        void (*put)(struct fwnode_handle *fwnode);
  72        bool (*device_is_available)(const struct fwnode_handle *fwnode);
  73        const void *(*device_get_match_data)(const struct fwnode_handle *fwnode,
  74                                             const struct device *dev);
  75        bool (*property_present)(const struct fwnode_handle *fwnode,
  76                                 const char *propname);
  77        int (*property_read_int_array)(const struct fwnode_handle *fwnode,
  78                                       const char *propname,
  79                                       unsigned int elem_size, void *val,
  80                                       size_t nval);
  81        int
  82        (*property_read_string_array)(const struct fwnode_handle *fwnode_handle,
  83                                      const char *propname, const char **val,
  84                                      size_t nval);
  85        struct fwnode_handle *(*get_parent)(const struct fwnode_handle *fwnode);
  86        struct fwnode_handle *
  87        (*get_next_child_node)(const struct fwnode_handle *fwnode,
  88                               struct fwnode_handle *child);
  89        struct fwnode_handle *
  90        (*get_named_child_node)(const struct fwnode_handle *fwnode,
  91                                const char *name);
  92        int (*get_reference_args)(const struct fwnode_handle *fwnode,
  93                                  const char *prop, const char *nargs_prop,
  94                                  unsigned int nargs, unsigned int index,
  95                                  struct fwnode_reference_args *args);
  96        struct fwnode_handle *
  97        (*graph_get_next_endpoint)(const struct fwnode_handle *fwnode,
  98                                   struct fwnode_handle *prev);
  99        struct fwnode_handle *
 100        (*graph_get_remote_endpoint)(const struct fwnode_handle *fwnode);
 101        struct fwnode_handle *
 102        (*graph_get_port_parent)(struct fwnode_handle *fwnode);
 103        int (*graph_parse_endpoint)(const struct fwnode_handle *fwnode,
 104                                    struct fwnode_endpoint *endpoint);
 105};
 106
 107#define fwnode_has_op(fwnode, op)                               \
 108        ((fwnode) && (fwnode)->ops && (fwnode)->ops->op)
 109#define fwnode_call_int_op(fwnode, op, ...)                             \
 110        (fwnode ? (fwnode_has_op(fwnode, op) ?                          \
 111                   (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : -ENXIO) : \
 112         -EINVAL)
 113
 114#define fwnode_call_bool_op(fwnode, op, ...)            \
 115        (fwnode_has_op(fwnode, op) ?                    \
 116         (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : false)
 117
 118#define fwnode_call_ptr_op(fwnode, op, ...)             \
 119        (fwnode_has_op(fwnode, op) ?                    \
 120         (fwnode)->ops->op(fwnode, ## __VA_ARGS__) : NULL)
 121#define fwnode_call_void_op(fwnode, op, ...)                            \
 122        do {                                                            \
 123                if (fwnode_has_op(fwnode, op))                          \
 124                        (fwnode)->ops->op(fwnode, ## __VA_ARGS__);      \
 125        } while (false)
 126
 127#endif
 128