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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/linux/component.h
1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/stddef.h>
11 * struct component_ops - callbacks for component drivers
13 * Components are registered with component_add() and unregistered with
16 struct component_ops
{
20 * Called through component_bind_all() when the aggregate driver is
21 * ready to bind the overall driver.
23 int (*bind
)(struct device
*comp
, struct device
*master
,
28 * Called through component_unbind_all() when the aggregate driver is
29 * ready to bind the overall driver, or when component_bind_all() fails
30 * part-ways through and needs to unbind some already bound components.
32 void (*unbind
)(struct device
*comp
, struct device
*master
,
36 int component_add(struct device
*, const struct component_ops
*);
37 int component_add_typed(struct device
*dev
, const struct component_ops
*ops
,
39 void component_del(struct device
*, const struct component_ops
*);
41 int component_bind_all(struct device
*master
, void *master_data
);
42 void component_unbind_all(struct device
*master
, void *master_data
);
47 * struct component_master_ops - callback for the aggregate driver
49 * Aggregate drivers are registered with component_master_add_with_match() and
50 * unregistered with component_master_del().
52 struct component_master_ops
{
56 * Called when all components or the aggregate driver, as specified in
57 * the match list passed to component_master_add_with_match(), are
58 * ready. Usually there are 3 steps to bind an aggregate driver:
60 * 1. Allocate a structure for the aggregate driver.
62 * 2. Bind all components to the aggregate driver by calling
63 * component_bind_all() with the aggregate driver structure as opaque
66 * 3. Register the aggregate driver with the subsystem to publish its
69 * Note that the lifetime of the aggregate driver does not align with
70 * any of the underlying &struct device instances. Therefore devm cannot
71 * be used and all resources acquired or allocated in this callback must
72 * be explicitly released in the @unbind callback.
74 int (*bind
)(struct device
*master
);
78 * Called when either the aggregate driver, using
79 * component_master_del(), or one of its components, using
80 * component_del(), is unregistered.
82 void (*unbind
)(struct device
*master
);
85 void component_master_del(struct device
*,
86 const struct component_master_ops
*);
88 struct component_match
;
90 int component_master_add_with_match(struct device
*,
91 const struct component_master_ops
*, struct component_match
*);
92 void component_match_add_release(struct device
*master
,
93 struct component_match
**matchptr
,
94 void (*release
)(struct device
*, void *),
95 int (*compare
)(struct device
*, void *), void *compare_data
);
96 void component_match_add_typed(struct device
*master
,
97 struct component_match
**matchptr
,
98 int (*compare_typed
)(struct device
*, int, void *), void *compare_data
);
101 * component_match_add - add a component match entry
102 * @master: device with the aggregate driver
103 * @matchptr: pointer to the list of component matches
104 * @compare: compare function to match against all components
105 * @compare_data: opaque pointer passed to the @compare function
107 * Adds a new component match to the list stored in @matchptr, which the @master
108 * aggregate driver needs to function. The list of component matches pointed to
109 * by @matchptr must be initialized to NULL before adding the first match. This
110 * only matches against components added with component_add().
112 * The allocated match list in @matchptr is automatically released using devm
115 * See also component_match_add_release() and component_match_add_typed().
117 static inline void component_match_add(struct device
*master
,
118 struct component_match
**matchptr
,
119 int (*compare
)(struct device
*, void *), void *compare_data
)
121 component_match_add_release(master
, matchptr
, NULL
, compare
,