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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* v4l2-mc.h - Media Controller V4L2 types and prototypes
*
* Copyright (C) 2016 Mauro Carvalho Chehab <mchehab@kernel.org>
* Copyright (C) 2006-2010 Nokia Corporation
* Copyright (c) 2016 Intel Corporation.
*/
#ifndef _V4L2_MC_H
#define _V4L2_MC_H
#include <media/media-device.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-subdev.h>
#include <linux/types.h>
/* We don't need to include pci.h or usb.h here */
struct pci_dev;
struct usb_device;
#ifdef CONFIG_MEDIA_CONTROLLER
/**
* v4l2_mc_create_media_graph() - create Media Controller links at the graph.
*
* @mdev: pointer to the &media_device struct.
*
* Add links between the entities commonly found on PC customer's hardware at
* the V4L2 side: camera sensors, audio and video PLL-IF decoders, tuners,
* analog TV decoder and I/O entities (video, VBI and Software Defined Radio).
*
* .. note::
*
* Webcams are modelled on a very simple way: the sensor is
* connected directly to the I/O entity. All dirty details, like
* scaler and crop HW are hidden. While such mapping is enough for v4l2
* interface centric PC-consumer's hardware, V4L2 subdev centric camera
* hardware should not use this routine, as it will not build the right graph.
*/
int v4l2_mc_create_media_graph(struct media_device *mdev);
/**
* v4l_enable_media_source() - Hold media source for exclusive use
* if free
*
* @vdev: pointer to struct video_device
*
* This interface calls enable_source handler to determine if
* media source is free for use. The enable_source handler is
* responsible for checking is the media source is free and
* start a pipeline between the media source and the media
* entity associated with the video device. This interface
* should be called from v4l2-core and dvb-core interfaces
* that change the source configuration.
*
* Return: returns zero on success or a negative error code.
*/
int v4l_enable_media_source(struct video_device *vdev);
/**
* v4l_disable_media_source() - Release media source
*
* @vdev: pointer to struct video_device
*
* This interface calls disable_source handler to release
* the media source. The disable_source handler stops the
* active media pipeline between the media source and the
* media entity associated with the video device.
*
* Return: returns zero on success or a negative error code.
*/
void v4l_disable_media_source(struct video_device *vdev);
/*
* v4l_vb2q_enable_media_tuner - Hold media source for exclusive use
* if free.
* @q - pointer to struct vb2_queue
*
* Wrapper for v4l_enable_media_source(). This function should
* be called from v4l2-core to enable the media source with
* pointer to struct vb2_queue as the input argument. Some
* v4l2-core interfaces don't have access to video device and
* this interface finds the struct video_device for the q and
* calls v4l_enable_media_source().
*/
int v4l_vb2q_enable_media_source(struct vb2_queue *q);
/**
* v4l2_create_fwnode_links_to_pad - Create fwnode-based links from a
* source subdev to a sink subdev pad.
*
* @src_sd: pointer to a source subdev
* @sink: pointer to a subdev sink pad
*
* This function searches for fwnode endpoint connections from a source
* subdevice to a single sink pad, and if suitable connections are found,
* translates them into media links to that pad. The function can be
* called by the sink subdevice, in its v4l2-async notifier subdev bound
* callback, to create links from a bound source subdevice.
*
* .. note::
*
* Any sink subdevice that calls this function must implement the
* .get_fwnode_pad media operation in order to verify endpoints passed
* to the sink are owned by the sink.
*
* Return 0 on success or a negative error code on failure.
*/
int v4l2_create_fwnode_links_to_pad(struct v4l2_subdev *src_sd,
struct media_pad *sink);
/**
* v4l2_create_fwnode_links - Create fwnode-based links from a source
* subdev to a sink subdev.
*
* @src_sd: pointer to a source subdevice
* @sink_sd: pointer to a sink subdevice
*
* This function searches for any and all fwnode endpoint connections
* between source and sink subdevices, and translates them into media
* links. The function can be called by the sink subdevice, in its
* v4l2-async notifier subdev bound callback, to create all links from
* a bound source subdevice.
*
* .. note::
*
* Any sink subdevice that calls this function must implement the
* .get_fwnode_pad media operation in order to verify endpoints passed
* to the sink are owned by the sink.
*
* Return 0 on success or a negative error code on failure.
*/
int v4l2_create_fwnode_links(struct v4l2_subdev *src_sd,
struct v4l2_subdev *sink_sd);
/**
* v4l2_pipeline_pm_get - Increase the use count of a pipeline
* @entity: The root entity of a pipeline
*
* Update the use count of all entities in the pipeline and power entities on.
*
* This function is intended to be called in video node open. It uses
* struct media_entity.use_count to track the power status. The use
* of this function should be paired with v4l2_pipeline_link_notify().
*
* Return 0 on success or a negative error code on failure.
*/
int v4l2_pipeline_pm_get(struct media_entity *entity);
/**
* v4l2_pipeline_pm_put - Decrease the use count of a pipeline
* @entity: The root entity of a pipeline
*
* Update the use count of all entities in the pipeline and power entities off.
*
* This function is intended to be called in video node release. It uses
* struct media_entity.use_count to track the power status. The use
* of this function should be paired with v4l2_pipeline_link_notify().
*/
void v4l2_pipeline_pm_put(struct media_entity *entity);
/**
* v4l2_pipeline_link_notify - Link management notification callback
* @link: The link
* @flags: New link flags that will be applied
* @notification: The link's state change notification type (MEDIA_DEV_NOTIFY_*)
*
* React to link management on powered pipelines by updating the use count of
* all entities in the source and sink sides of the link. Entities are powered
* on or off accordingly. The use of this function should be paired
* with v4l2_pipeline_pm_{get,put}().
*
* Return 0 on success or a negative error code on failure. Powering entities
* off is assumed to never fail. This function will not fail for disconnection
* events.
*/
int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
unsigned int notification);
#else /* CONFIG_MEDIA_CONTROLLER */
static inline int v4l2_mc_create_media_graph(struct media_device *mdev)
{
return 0;
}
static inline int v4l_enable_media_source(struct video_device *vdev)
{
return 0;
}
static inline void v4l_disable_media_source(struct video_device *vdev)
{
}
static inline int v4l_vb2q_enable_media_source(struct vb2_queue *q)
{
return 0;
}
static inline int v4l2_pipeline_pm_get(struct media_entity *entity)
{
return 0;
}
static inline void v4l2_pipeline_pm_put(struct media_entity *entity)
{}
static inline int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
unsigned int notification)
{
return 0;
}
#endif /* CONFIG_MEDIA_CONTROLLER */
#endif /* _V4L2_MC_H */
|
