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TOMOYO Linux Cross Reference
Linux/include/media/v4l2-mc.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  * v4l2-mc.h - Media Controller V4L2 types and prototypes
  4  *
  5  * Copyright (C) 2016 Mauro Carvalho Chehab <mchehab@kernel.org>
  6  * Copyright (C) 2006-2010 Nokia Corporation
  7  * Copyright (c) 2016 Intel Corporation.
  8  */
  9 
 10 #ifndef _V4L2_MC_H
 11 #define _V4L2_MC_H
 12 
 13 #include <media/media-device.h>
 14 #include <media/v4l2-dev.h>
 15 #include <linux/types.h>
 16 
 17 /* We don't need to include pci.h or usb.h here */
 18 struct pci_dev;
 19 struct usb_device;
 20 
 21 #ifdef CONFIG_MEDIA_CONTROLLER
 22 /**
 23  * v4l2_mc_create_media_graph() - create Media Controller links at the graph.
 24  *
 25  * @mdev:       pointer to the &media_device struct.
 26  *
 27  * Add links between the entities commonly found on PC customer's hardware at
 28  * the V4L2 side: camera sensors, audio and video PLL-IF decoders, tuners,
 29  * analog TV decoder and I/O entities (video, VBI and Software Defined Radio).
 30  *
 31  * .. note::
 32  *
 33  *    Webcams are modelled on a very simple way: the sensor is
 34  *    connected directly to the I/O entity. All dirty details, like
 35  *    scaler and crop HW are hidden. While such mapping is enough for v4l2
 36  *    interface centric PC-consumer's hardware, V4L2 subdev centric camera
 37  *    hardware should not use this routine, as it will not build the right graph.
 38  */
 39 int v4l2_mc_create_media_graph(struct media_device *mdev);
 40 
 41 /**
 42  * v4l_enable_media_source() -  Hold media source for exclusive use
 43  *                              if free
 44  *
 45  * @vdev:       pointer to struct video_device
 46  *
 47  * This interface calls enable_source handler to determine if
 48  * media source is free for use. The enable_source handler is
 49  * responsible for checking is the media source is free and
 50  * start a pipeline between the media source and the media
 51  * entity associated with the video device. This interface
 52  * should be called from v4l2-core and dvb-core interfaces
 53  * that change the source configuration.
 54  *
 55  * Return: returns zero on success or a negative error code.
 56  */
 57 int v4l_enable_media_source(struct video_device *vdev);
 58 
 59 /**
 60  * v4l_disable_media_source() - Release media source
 61  *
 62  * @vdev:       pointer to struct video_device
 63  *
 64  * This interface calls disable_source handler to release
 65  * the media source. The disable_source handler stops the
 66  * active media pipeline between the media source and the
 67  * media entity associated with the video device.
 68  *
 69  * Return: returns zero on success or a negative error code.
 70  */
 71 void v4l_disable_media_source(struct video_device *vdev);
 72 
 73 /*
 74  * v4l_vb2q_enable_media_tuner -  Hold media source for exclusive use
 75  *                                if free.
 76  * @q - pointer to struct vb2_queue
 77  *
 78  * Wrapper for v4l_enable_media_source(). This function should
 79  * be called from v4l2-core to enable the media source with
 80  * pointer to struct vb2_queue as the input argument. Some
 81  * v4l2-core interfaces don't have access to video device and
 82  * this interface finds the struct video_device for the q and
 83  * calls v4l_enable_media_source().
 84  */
 85 int v4l_vb2q_enable_media_source(struct vb2_queue *q);
 86 
 87 
 88 /**
 89  * v4l2_pipeline_pm_get - Increase the use count of a pipeline
 90  * @entity: The root entity of a pipeline
 91  *
 92  * Update the use count of all entities in the pipeline and power entities on.
 93  *
 94  * This function is intended to be called in video node open. It uses
 95  * struct media_entity.use_count to track the power status. The use
 96  * of this function should be paired with v4l2_pipeline_link_notify().
 97  *
 98  * Return 0 on success or a negative error code on failure.
 99  */
100 int v4l2_pipeline_pm_get(struct media_entity *entity);
101 
102 /**
103  * v4l2_pipeline_pm_put - Decrease the use count of a pipeline
104  * @entity: The root entity of a pipeline
105  *
106  * Update the use count of all entities in the pipeline and power entities off.
107  *
108  * This function is intended to be called in video node release. It uses
109  * struct media_entity.use_count to track the power status. The use
110  * of this function should be paired with v4l2_pipeline_link_notify().
111  */
112 void v4l2_pipeline_pm_put(struct media_entity *entity);
113 
114 
115 /**
116  * v4l2_pipeline_link_notify - Link management notification callback
117  * @link: The link
118  * @flags: New link flags that will be applied
119  * @notification: The link's state change notification type (MEDIA_DEV_NOTIFY_*)
120  *
121  * React to link management on powered pipelines by updating the use count of
122  * all entities in the source and sink sides of the link. Entities are powered
123  * on or off accordingly. The use of this function should be paired
124  * with v4l2_pipeline_pm_{get,put}().
125  *
126  * Return 0 on success or a negative error code on failure. Powering entities
127  * off is assumed to never fail. This function will not fail for disconnection
128  * events.
129  */
130 int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
131                               unsigned int notification);
132 
133 #else /* CONFIG_MEDIA_CONTROLLER */
134 
135 static inline int v4l2_mc_create_media_graph(struct media_device *mdev)
136 {
137         return 0;
138 }
139 
140 static inline int v4l_enable_media_source(struct video_device *vdev)
141 {
142         return 0;
143 }
144 
145 static inline void v4l_disable_media_source(struct video_device *vdev)
146 {
147 }
148 
149 static inline int v4l_vb2q_enable_media_source(struct vb2_queue *q)
150 {
151         return 0;
152 }
153 
154 static inline int v4l2_pipeline_pm_get(struct media_entity *entity)
155 {
156         return 0;
157 }
158 
159 static inline void v4l2_pipeline_pm_put(struct media_entity *entity)
160 {}
161 
162 static inline int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
163                                             unsigned int notification)
164 {
165         return 0;
166 }
167 
168 #endif /* CONFIG_MEDIA_CONTROLLER */
169 #endif /* _V4L2_MC_H */
170 

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