158 lines
4.2 KiB
C
158 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* cec-notifier.h - notify CEC drivers of physical address changes
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*
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* Copyright 2016 Russell King <rmk+kernel@arm.linux.org.uk>
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* Copyright 2016-2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*/
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#ifndef LINUX_CEC_NOTIFIER_H
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#define LINUX_CEC_NOTIFIER_H
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#include <linux/types.h>
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#include <media/cec.h>
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struct device;
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struct edid;
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struct cec_adapter;
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struct cec_notifier;
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#if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER)
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/**
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* cec_notifier_get_conn - find or create a new cec_notifier for the given
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* device and connector tuple.
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* @dev: device that sends the events.
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* @conn: the connector name from which the event occurs
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*
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* If a notifier for device @dev already exists, then increase the refcount
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* and return that notifier.
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*
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* If it doesn't exist, then allocate a new notifier struct and return a
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* pointer to that new struct.
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*
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* Return NULL if the memory could not be allocated.
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*/
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struct cec_notifier *cec_notifier_get_conn(struct device *dev,
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const char *conn);
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/**
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* cec_notifier_put - decrease refcount and delete when the refcount reaches 0.
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* @n: notifier
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*/
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void cec_notifier_put(struct cec_notifier *n);
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/**
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* cec_notifier_set_phys_addr - set a new physical address.
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* @n: the CEC notifier
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* @pa: the CEC physical address
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*
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* Set a new CEC physical address.
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* Does nothing if @n == NULL.
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*/
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void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa);
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/**
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* cec_notifier_set_phys_addr_from_edid - set parse the PA from the EDID.
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* @n: the CEC notifier
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* @edid: the struct edid pointer
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*
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* Parses the EDID to obtain the new CEC physical address and set it.
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* Does nothing if @n == NULL.
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*/
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void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
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const struct edid *edid);
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/**
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* cec_notifier_register - register a callback with the notifier
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* @n: the CEC notifier
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* @adap: the CEC adapter, passed as argument to the callback function
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* @callback: the callback function
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*/
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void cec_notifier_register(struct cec_notifier *n,
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struct cec_adapter *adap,
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void (*callback)(struct cec_adapter *adap, u16 pa));
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/**
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* cec_notifier_unregister - unregister the callback from the notifier.
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* @n: the CEC notifier
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*/
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void cec_notifier_unregister(struct cec_notifier *n);
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/**
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* cec_register_cec_notifier - register the notifier with the cec adapter.
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* @adap: the CEC adapter
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* @notifier: the CEC notifier
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*/
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void cec_register_cec_notifier(struct cec_adapter *adap,
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struct cec_notifier *notifier);
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#else
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static inline struct cec_notifier *cec_notifier_get_conn(struct device *dev,
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const char *conn)
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{
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/* A non-NULL pointer is expected on success */
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return (struct cec_notifier *)0xdeadfeed;
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}
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static inline void cec_notifier_put(struct cec_notifier *n)
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{
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}
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static inline void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa)
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{
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}
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static inline void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
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const struct edid *edid)
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{
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}
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static inline void cec_notifier_register(struct cec_notifier *n,
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struct cec_adapter *adap,
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void (*callback)(struct cec_adapter *adap, u16 pa))
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{
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}
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static inline void cec_notifier_unregister(struct cec_notifier *n)
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{
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}
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static inline void cec_register_cec_notifier(struct cec_adapter *adap,
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struct cec_notifier *notifier)
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{
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}
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#endif
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/**
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* cec_notifier_get - find or create a new cec_notifier for the given device.
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* @dev: device that sends the events.
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*
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* If a notifier for device @dev already exists, then increase the refcount
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* and return that notifier.
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*
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* If it doesn't exist, then allocate a new notifier struct and return a
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* pointer to that new struct.
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*
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* Return NULL if the memory could not be allocated.
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*/
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static inline struct cec_notifier *cec_notifier_get(struct device *dev)
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{
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return cec_notifier_get_conn(dev, NULL);
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}
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/**
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* cec_notifier_phys_addr_invalidate() - set the physical address to INVALID
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*
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* @n: the CEC notifier
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*
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* This is a simple helper function to invalidate the physical
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* address. Does nothing if @n == NULL.
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*/
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static inline void cec_notifier_phys_addr_invalidate(struct cec_notifier *n)
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{
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cec_notifier_set_phys_addr(n, CEC_PHYS_ADDR_INVALID);
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}
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#endif
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