linux/include/media/cec-notifier.h
Neil Armstrong 7a78c1e116 media: cec-notifier: Get notifier by device and connector name
In non device-tree world, we can need to get the notifier by the driver
name directly and eventually defer probe if not yet created.

This patch adds a variant of the get function by using the device name
instead and will not create a notifier if not yet created.

But the i915 driver exposes at least 2 HDMI connectors, this patch also
adds the possibility to add a connector name tied to the notifier device
to form a tuple and associate different CEC controllers for each HDMI
connectors.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2018-07-13 08:44:16 +01:00

158 lines
4.2 KiB
C

/* 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/types.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);
#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)
{
}
#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