126 lines
4.1 KiB
C
126 lines
4.1 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef COMPONENT_H
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#define COMPONENT_H
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#include <linux/stddef.h>
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struct device;
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/**
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* struct component_ops - callbacks for component drivers
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*
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* Components are registered with component_add() and unregistered with
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* component_del().
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*/
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struct component_ops {
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/**
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* @bind:
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*
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* Called through component_bind_all() when the aggregate driver is
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* ready to bind the overall driver.
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*/
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int (*bind)(struct device *comp, struct device *master,
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void *master_data);
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/**
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* @unbind:
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*
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* Called through component_unbind_all() when the aggregate driver is
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* ready to bind the overall driver, or when component_bind_all() fails
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* part-ways through and needs to unbind some already bound components.
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*/
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void (*unbind)(struct device *comp, struct device *master,
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void *master_data);
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};
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int component_add(struct device *, const struct component_ops *);
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int component_add_typed(struct device *dev, const struct component_ops *ops,
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int subcomponent);
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void component_del(struct device *, const struct component_ops *);
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int component_bind_all(struct device *master, void *master_data);
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void component_unbind_all(struct device *master, void *master_data);
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struct master;
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/**
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* struct component_master_ops - callback for the aggregate driver
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*
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* Aggregate drivers are registered with component_master_add_with_match() and
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* unregistered with component_master_del().
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*/
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struct component_master_ops {
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/**
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* @bind:
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*
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* Called when all components or the aggregate driver, as specified in
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* the match list passed to component_master_add_with_match(), are
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* ready. Usually there are 3 steps to bind an aggregate driver:
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*
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* 1. Allocate a structure for the aggregate driver.
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*
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* 2. Bind all components to the aggregate driver by calling
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* component_bind_all() with the aggregate driver structure as opaque
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* pointer data.
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*
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* 3. Register the aggregate driver with the subsystem to publish its
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* interfaces.
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*
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* Note that the lifetime of the aggregate driver does not align with
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* any of the underlying &struct device instances. Therefore devm cannot
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* be used and all resources acquired or allocated in this callback must
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* be explicitly released in the @unbind callback.
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*/
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int (*bind)(struct device *master);
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/**
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* @unbind:
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*
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* Called when either the aggregate driver, using
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* component_master_del(), or one of its components, using
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* component_del(), is unregistered.
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*/
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void (*unbind)(struct device *master);
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};
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void component_master_del(struct device *,
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const struct component_master_ops *);
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struct component_match;
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int component_master_add_with_match(struct device *,
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const struct component_master_ops *, struct component_match *);
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void component_match_add_release(struct device *master,
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struct component_match **matchptr,
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void (*release)(struct device *, void *),
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int (*compare)(struct device *, void *), void *compare_data);
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void component_match_add_typed(struct device *master,
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struct component_match **matchptr,
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int (*compare_typed)(struct device *, int, void *), void *compare_data);
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/**
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* component_match_add - add a component match entry
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* @master: device with the aggregate driver
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* @matchptr: pointer to the list of component matches
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* @compare: compare function to match against all components
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* @compare_data: opaque pointer passed to the @compare function
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*
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* Adds a new component match to the list stored in @matchptr, which the @master
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* aggregate driver needs to function. The list of component matches pointed to
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* by @matchptr must be initialized to NULL before adding the first match. This
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* only matches against components added with component_add().
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*
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* The allocated match list in @matchptr is automatically released using devm
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* actions.
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*
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* See also component_match_add_release() and component_match_add_typed().
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*/
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static inline void component_match_add(struct device *master,
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struct component_match **matchptr,
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int (*compare)(struct device *, void *), void *compare_data)
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{
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component_match_add_release(master, matchptr, NULL, compare,
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compare_data);
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}
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#endif
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