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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* cec-notifier.h - notify CEC drivers of physical address changes
*
* Copyright 2016 Russell King <rmk+kernel@arm.linux.org.uk>
* Copyright 2016-2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
*/
#ifndef LINUX_CEC_NOTIFIER_H
#define LINUX_CEC_NOTIFIER_H
#include <linux/err.h>
#include <media/cec.h>
struct device;
struct edid;
struct cec_adapter;
struct cec_notifier;
#if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER)
/**
* cec_notifier_get_conn - find or create a new cec_notifier for the given
* device and connector tuple.
* @dev: device that sends the events.
* @conn: the connector name from which the event occurs
*
* If a notifier for device @dev already exists, then increase the refcount
* and return that notifier.
*
* If it doesn't exist, then allocate a new notifier struct and return a
* pointer to that new struct.
*
* Return NULL if the memory could not be allocated.
*/
struct cec_notifier *cec_notifier_get_conn(struct device *dev,
const char *conn);
/**
* cec_notifier_put - decrease refcount and delete when the refcount reaches 0.
* @n: notifier
*/
void cec_notifier_put(struct cec_notifier *n);
/**
* cec_notifier_set_phys_addr - set a new physical address.
* @n: the CEC notifier
* @pa: the CEC physical address
*
* Set a new CEC physical address.
* Does nothing if @n == NULL.
*/
void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa);
/**
* cec_notifier_set_phys_addr_from_edid - set parse the PA from the EDID.
* @n: the CEC notifier
* @edid: the struct edid pointer
*
* Parses the EDID to obtain the new CEC physical address and set it.
* Does nothing if @n == NULL.
*/
void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
const struct edid *edid);
/**
* cec_notifier_register - register a callback with the notifier
* @n: the CEC notifier
* @adap: the CEC adapter, passed as argument to the callback function
* @callback: the callback function
*/
void cec_notifier_register(struct cec_notifier *n,
struct cec_adapter *adap,
void (*callback)(struct cec_adapter *adap, u16 pa));
/**
* cec_notifier_unregister - unregister the callback from the notifier.
* @n: the CEC notifier
*/
void cec_notifier_unregister(struct cec_notifier *n);
/**
* cec_register_cec_notifier - register the notifier with the cec adapter.
* @adap: the CEC adapter
* @notifier: the CEC notifier
*/
void cec_register_cec_notifier(struct cec_adapter *adap,
struct cec_notifier *notifier);
/**
* cec_notifier_parse_hdmi_phandle - find the hdmi device from "hdmi-phandle"
* @dev: the device with the "hdmi-phandle" device tree property
*
* Returns the device pointer referenced by the "hdmi-phandle" property.
* Note that the refcount of the returned device is not incremented.
* This device pointer is only used as a key value in the notifier
* list, but it is never accessed by the CEC driver.
*/
struct device *cec_notifier_parse_hdmi_phandle(struct device *dev);
#else
static inline struct cec_notifier *cec_notifier_get_conn(struct device *dev,
const char *conn)
{
/* A non-NULL pointer is expected on success */
return (struct cec_notifier *)0xdeadfeed;
}
static inline void cec_notifier_put(struct cec_notifier *n)
{
}
static inline void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa)
{
}
static inline void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
const struct edid *edid)
{
}
static inline void cec_notifier_register(struct cec_notifier *n,
struct cec_adapter *adap,
void (*callback)(struct cec_adapter *adap, u16 pa))
{
}
static inline void cec_notifier_unregister(struct cec_notifier *n)
{
}
static inline void cec_register_cec_notifier(struct cec_adapter *adap,
struct cec_notifier *notifier)
{
}
static inline struct device *cec_notifier_parse_hdmi_phandle(struct device *dev)
{
return ERR_PTR(-ENODEV);
}
#endif
/**
* cec_notifier_get - find or create a new cec_notifier for the given device.
* @dev: device that sends the events.
*
* If a notifier for device @dev already exists, then increase the refcount
* and return that notifier.
*
* If it doesn't exist, then allocate a new notifier struct and return a
* pointer to that new struct.
*
* Return NULL if the memory could not be allocated.
*/
static inline struct cec_notifier *cec_notifier_get(struct device *dev)
{
return cec_notifier_get_conn(dev, NULL);
}
/**
* cec_notifier_phys_addr_invalidate() - set the physical address to INVALID
*
* @n: the CEC notifier
*
* This is a simple helper function to invalidate the physical
* address. Does nothing if @n == NULL.
*/
static inline void cec_notifier_phys_addr_invalidate(struct cec_notifier *n)
{
cec_notifier_set_phys_addr(n, CEC_PHYS_ADDR_INVALID);
}
#endif
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