summaryrefslogtreecommitdiff
path: root/include/media/cec-notifier.h
blob: a4f7429c4ae533a07d9c3efdeebb62892fcab2f6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/*
 * 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.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#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 - 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.
 */
struct cec_notifier *cec_notifier_get(struct device *dev);

/**
 * 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);

#else
static inline struct cec_notifier *cec_notifier_get(struct device *dev)
{
	/* 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)
{
}

#endif

/**
 * 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