1 /* SPDX-License-Identifier: GPL-2.0-or-later * 1
2 /*
3 * v4l2-mc.h - Media Controller V4L2 types and
4 *
5 * Copyright (C) 2016 Mauro Carvalho Chehab <m
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 <media/v4l2-subdev.h>
16 #include <linux/types.h>
17
18 /* We don't need to include pci.h or usb.h her
19 struct pci_dev;
20 struct usb_device;
21
22 #ifdef CONFIG_MEDIA_CONTROLLER
23 /**
24 * v4l2_mc_create_media_graph() - create Media
25 *
26 * @mdev: pointer to the &media_device s
27 *
28 * Add links between the entities commonly fou
29 * the V4L2 side: camera sensors, audio and vi
30 * analog TV decoder and I/O entities (video,
31 *
32 * .. note::
33 *
34 * Webcams are modelled on a very simple wa
35 * connected directly to the I/O entity. Al
36 * scaler and crop HW are hidden. While suc
37 * interface centric PC-consumer's hardware
38 * hardware should not use this routine, as
39 */
40 int v4l2_mc_create_media_graph(struct media_de
41
42 /**
43 * v4l_enable_media_source() - Hold media sou
44 * if free
45 *
46 * @vdev: pointer to struct video_device
47 *
48 * This interface calls enable_source handler
49 * media source is free for use. The enable_so
50 * responsible for checking is the media sourc
51 * start a pipeline between the media source a
52 * entity associated with the video device. Th
53 * should be called from v4l2-core and dvb-cor
54 * that change the source configuration.
55 *
56 * Return: returns zero on success or a negati
57 */
58 int v4l_enable_media_source(struct video_devic
59
60 /**
61 * v4l_disable_media_source() - Release media
62 *
63 * @vdev: pointer to struct video_device
64 *
65 * This interface calls disable_source handler
66 * the media source. The disable_source handle
67 * active media pipeline between the media sou
68 * media entity associated with the video devi
69 *
70 * Return: returns zero on success or a negati
71 */
72 void v4l_disable_media_source(struct video_dev
73
74 /*
75 * v4l_vb2q_enable_media_tuner - Hold media s
76 * if free.
77 * @q - pointer to struct vb2_queue
78 *
79 * Wrapper for v4l_enable_media_source(). This
80 * be called from v4l2-core to enable the medi
81 * pointer to struct vb2_queue as the input ar
82 * v4l2-core interfaces don't have access to v
83 * this interface finds the struct video_devic
84 * calls v4l_enable_media_source().
85 */
86 int v4l_vb2q_enable_media_source(struct vb2_qu
87
88 /**
89 * v4l2_create_fwnode_links_to_pad - Create fw
90 * source su
91 *
92 * @src_sd: pointer to a source subdev
93 * @sink: pointer to a sink pad
94 * @flags: the link flags
95 *
96 * This function searches for fwnode endpoint
97 * subdevice to a single sink pad, and if suit
98 * translates them into media links to that pa
99 * called by the sink, in its v4l2-async notif
100 * links from a bound source subdevice.
101 *
102 * The @flags argument specifies the link flag
103 * the flags are valid regardless of the numbe
104 * For instance, setting the MEDIA_LNK_FL_ENAB
105 * links to be enabled, which isn't valid if m
106 *
107 * .. note::
108 *
109 * Any sink subdevice that calls this funct
110 * .get_fwnode_pad media operation in order
111 * to the sink are owned by the sink.
112 *
113 * Return 0 on success or a negative error cod
114 */
115 int v4l2_create_fwnode_links_to_pad(struct v4l
116 struct med
117
118 /**
119 * v4l2_create_fwnode_links - Create fwnode-ba
120 * subdev to a sink
121 *
122 * @src_sd: pointer to a source subdevice
123 * @sink_sd: pointer to a sink subdevice
124 *
125 * This function searches for any and all fwno
126 * between source and sink subdevices, and tra
127 * links. The function can be called by the si
128 * v4l2-async notifier subdev bound callback,
129 * a bound source subdevice.
130 *
131 * .. note::
132 *
133 * Any sink subdevice that calls this funct
134 * .get_fwnode_pad media operation in order
135 * to the sink are owned by the sink.
136 *
137 * Return 0 on success or a negative error cod
138 */
139 int v4l2_create_fwnode_links(struct v4l2_subde
140 struct v4l2_subde
141
142 /**
143 * v4l2_pipeline_pm_get - Increase the use cou
144 * @entity: The root entity of a pipeline
145 *
146 * THIS FUNCTION IS DEPRECATED. DO NOT USE IN
147 * ON SUB-DEVICE DRIVERS INSTEAD.
148 *
149 * Update the use count of all entities in the
150 *
151 * This function is intended to be called in v
152 * struct media_entity.use_count to track the
153 * of this function should be paired with v4l2
154 *
155 * Return 0 on success or a negative error cod
156 */
157 int v4l2_pipeline_pm_get(struct media_entity *
158
159 /**
160 * v4l2_pipeline_pm_put - Decrease the use cou
161 * @entity: The root entity of a pipeline
162 *
163 * THIS FUNCTION IS DEPRECATED. DO NOT USE IN
164 * ON SUB-DEVICE DRIVERS INSTEAD.
165 *
166 * Update the use count of all entities in the
167 *
168 * This function is intended to be called in v
169 * struct media_entity.use_count to track the
170 * of this function should be paired with v4l2
171 */
172 void v4l2_pipeline_pm_put(struct media_entity
173
174
175 /**
176 * v4l2_pipeline_link_notify - Link management
177 * @link: The link
178 * @flags: New link flags that will be applied
179 * @notification: The link's state change noti
180 *
181 * React to link management on powered pipelin
182 * all entities in the source and sink sides o
183 * on or off accordingly. The use of this func
184 * with v4l2_pipeline_pm_{get,put}().
185 *
186 * Return 0 on success or a negative error cod
187 * off is assumed to never fail. This function
188 * events.
189 */
190 int v4l2_pipeline_link_notify(struct media_lin
191 unsigned int not
192
193 #else /* CONFIG_MEDIA_CONTROLLER */
194
195 static inline int v4l2_mc_create_media_graph(s
196 {
197 return 0;
198 }
199
200 static inline int v4l_enable_media_source(stru
201 {
202 return 0;
203 }
204
205 static inline void v4l_disable_media_source(st
206 {
207 }
208
209 static inline int v4l_vb2q_enable_media_source
210 {
211 return 0;
212 }
213
214 static inline int v4l2_pipeline_pm_get(struct
215 {
216 return 0;
217 }
218
219 static inline void v4l2_pipeline_pm_put(struct
220 {}
221
222 static inline int v4l2_pipeline_link_notify(st
223 un
224 {
225 return 0;
226 }
227
228 #endif /* CONFIG_MEDIA_CONTROLLER */
229 #endif /* _V4L2_MC_H */
230
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