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53e269c1 LP |
1 | /* |
2 | * Media entity | |
3 | * | |
4 | * Copyright (C) 2010 Nokia Corporation | |
5 | * | |
6 | * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> | |
7 | * Sakari Ailus <sakari.ailus@iki.fi> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | #ifndef _MEDIA_ENTITY_H | |
24 | #define _MEDIA_ENTITY_H | |
25 | ||
26 | #include <linux/list.h> | |
1651333b | 27 | #include <linux/media.h> |
53e269c1 | 28 | |
e02188c9 LP |
29 | struct media_pipeline { |
30 | }; | |
31 | ||
53e269c1 LP |
32 | struct media_link { |
33 | struct media_pad *source; /* Source pad */ | |
34 | struct media_pad *sink; /* Sink pad */ | |
35 | struct media_link *reverse; /* Link in the reverse direction */ | |
36 | unsigned long flags; /* Link flags (MEDIA_LNK_FL_*) */ | |
37 | }; | |
38 | ||
39 | struct media_pad { | |
40 | struct media_entity *entity; /* Entity this pad belongs to */ | |
41 | u16 index; /* Pad index in the entity pads array */ | |
42 | unsigned long flags; /* Pad flags (MEDIA_PAD_FL_*) */ | |
43 | }; | |
44 | ||
97548ed4 LP |
45 | struct media_entity_operations { |
46 | int (*link_setup)(struct media_entity *entity, | |
47 | const struct media_pad *local, | |
48 | const struct media_pad *remote, u32 flags); | |
49 | }; | |
50 | ||
53e269c1 LP |
51 | struct media_entity { |
52 | struct list_head list; | |
53 | struct media_device *parent; /* Media device this entity belongs to*/ | |
54 | u32 id; /* Entity ID, unique in the parent media | |
55 | * device context */ | |
56 | const char *name; /* Entity name */ | |
57 | u32 type; /* Entity type (MEDIA_ENT_T_*) */ | |
58 | u32 revision; /* Entity revision, driver specific */ | |
59 | unsigned long flags; /* Entity flags (MEDIA_ENT_FL_*) */ | |
60 | u32 group_id; /* Entity group ID */ | |
61 | ||
62 | u16 num_pads; /* Number of sink and source pads */ | |
63 | u16 num_links; /* Number of existing links, both | |
64 | * enabled and disabled */ | |
65 | u16 num_backlinks; /* Number of backlinks */ | |
66 | u16 max_links; /* Maximum number of links */ | |
67 | ||
68 | struct media_pad *pads; /* Pads array (num_pads elements) */ | |
69 | struct media_link *links; /* Links array (max_links elements)*/ | |
70 | ||
97548ed4 LP |
71 | const struct media_entity_operations *ops; /* Entity operations */ |
72 | ||
503c3d82 LP |
73 | /* Reference counts must never be negative, but are signed integers on |
74 | * purpose: a simple WARN_ON(<0) check can be used to detect reference | |
75 | * count bugs that would make them negative. | |
76 | */ | |
e02188c9 | 77 | int stream_count; /* Stream count for the entity. */ |
503c3d82 LP |
78 | int use_count; /* Use count for the entity. */ |
79 | ||
e02188c9 LP |
80 | struct media_pipeline *pipe; /* Pipeline this entity belongs to. */ |
81 | ||
53e269c1 LP |
82 | union { |
83 | /* Node specifications */ | |
84 | struct { | |
85 | u32 major; | |
86 | u32 minor; | |
87 | } v4l; | |
88 | struct { | |
89 | u32 major; | |
90 | u32 minor; | |
91 | } fb; | |
92 | struct { | |
93 | u32 card; | |
94 | u32 device; | |
95 | u32 subdevice; | |
96 | } alsa; | |
97 | int dvb; | |
98 | ||
99 | /* Sub-device specifications */ | |
100 | /* Nothing needed yet */ | |
101 | }; | |
102 | }; | |
103 | ||
104 | static inline u32 media_entity_type(struct media_entity *entity) | |
105 | { | |
106 | return entity->type & MEDIA_ENT_TYPE_MASK; | |
107 | } | |
108 | ||
109 | static inline u32 media_entity_subtype(struct media_entity *entity) | |
110 | { | |
111 | return entity->type & MEDIA_ENT_SUBTYPE_MASK; | |
112 | } | |
113 | ||
a5ccc48a SA |
114 | #define MEDIA_ENTITY_ENUM_MAX_DEPTH 16 |
115 | ||
116 | struct media_entity_graph { | |
117 | struct { | |
118 | struct media_entity *entity; | |
119 | int link; | |
120 | } stack[MEDIA_ENTITY_ENUM_MAX_DEPTH]; | |
121 | int top; | |
122 | }; | |
123 | ||
53e269c1 LP |
124 | int media_entity_init(struct media_entity *entity, u16 num_pads, |
125 | struct media_pad *pads, u16 extra_links); | |
126 | void media_entity_cleanup(struct media_entity *entity); | |
e02188c9 | 127 | |
53e269c1 LP |
128 | int media_entity_create_link(struct media_entity *source, u16 source_pad, |
129 | struct media_entity *sink, u16 sink_pad, u32 flags); | |
97548ed4 LP |
130 | int __media_entity_setup_link(struct media_link *link, u32 flags); |
131 | int media_entity_setup_link(struct media_link *link, u32 flags); | |
132 | struct media_link *media_entity_find_link(struct media_pad *source, | |
133 | struct media_pad *sink); | |
134 | struct media_pad *media_entity_remote_source(struct media_pad *pad); | |
53e269c1 | 135 | |
503c3d82 LP |
136 | struct media_entity *media_entity_get(struct media_entity *entity); |
137 | void media_entity_put(struct media_entity *entity); | |
138 | ||
a5ccc48a SA |
139 | void media_entity_graph_walk_start(struct media_entity_graph *graph, |
140 | struct media_entity *entity); | |
141 | struct media_entity * | |
142 | media_entity_graph_walk_next(struct media_entity_graph *graph); | |
e02188c9 LP |
143 | void media_entity_pipeline_start(struct media_entity *entity, |
144 | struct media_pipeline *pipe); | |
145 | void media_entity_pipeline_stop(struct media_entity *entity); | |
a5ccc48a | 146 | |
97548ed4 LP |
147 | #define media_entity_call(entity, operation, args...) \ |
148 | (((entity)->ops && (entity)->ops->operation) ? \ | |
149 | (entity)->ops->operation((entity) , ##args) : -ENOIOCTLCMD) | |
150 | ||
53e269c1 | 151 | #endif |