1 /*
2 * vimc-common.h Virtual Media Controller Driver
3 *
4 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 */
17
18 #ifndef _VIMC_COMMON_H_
19 #define _VIMC_COMMON_H_
20
21 #include <linux/slab.h>
22 #include <media/media-device.h>
23 #include <media/v4l2-device.h>
24
25 #define VIMC_FRAME_MAX_WIDTH 4096
26 #define VIMC_FRAME_MAX_HEIGHT 2160
27 #define VIMC_FRAME_MIN_WIDTH 16
28 #define VIMC_FRAME_MIN_HEIGHT 16
29
30 #define VIMC_FRAME_INDEX(lin, col, width, bpp) ((lin * width + col) * bpp)
31
32 /**
33 * struct vimc_colorimetry_clamp - Adjust colorimetry parameters
34 *
35 * @fmt: the pointer to struct v4l2_pix_format or
36 * struct v4l2_mbus_framefmt
37 *
38 * Entities must check if colorimetry given by the userspace is valid, if not
39 * then set them as DEFAULT
40 */
41 #define vimc_colorimetry_clamp(fmt) \
42 do { \
43 if ((fmt)->colorspace == V4L2_COLORSPACE_DEFAULT \
44 || (fmt)->colorspace > V4L2_COLORSPACE_DCI_P3) { \
45 (fmt)->colorspace = V4L2_COLORSPACE_DEFAULT; \
46 (fmt)->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; \
47 (fmt)->quantization = V4L2_QUANTIZATION_DEFAULT; \
48 (fmt)->xfer_func = V4L2_XFER_FUNC_DEFAULT; \
49 } \
50 if ((fmt)->ycbcr_enc > V4L2_YCBCR_ENC_SMPTE240M) \
51 (fmt)->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; \
52 if ((fmt)->quantization > V4L2_QUANTIZATION_LIM_RANGE) \
53 (fmt)->quantization = V4L2_QUANTIZATION_DEFAULT; \
54 if ((fmt)->xfer_func > V4L2_XFER_FUNC_SMPTE2084) \
55 (fmt)->xfer_func = V4L2_XFER_FUNC_DEFAULT; \
56 } while (0)
57
58 /**
59 * struct vimc_platform_data - platform data to components
60 *
61 * @entity_name: The name of the entity to be created
62 *
63 * Board setup code will often provide additional information using the device's
64 * platform_data field to hold additional information.
65 * When injecting a new platform_device in the component system the core needs
66 * to provide to the corresponding submodules the name of the entity that should
67 * be used when registering the subdevice in the Media Controller system.
68 */
69 struct vimc_platform_data {
70 char entity_name[32];
71 };
72
73 /**
74 * struct vimc_pix_map - maps media bus code with v4l2 pixel format
75 *
76 * @code: media bus format code defined by MEDIA_BUS_FMT_* macros
77 * @bbp: number of bytes each pixel occupies
78 * @pixelformat: pixel format devined by V4L2_PIX_FMT_* macros
79 *
80 * Struct which matches the MEDIA_BUS_FMT_* codes with the corresponding
81 * V4L2_PIX_FMT_* fourcc pixelformat and its bytes per pixel (bpp)
82 */
83 struct vimc_pix_map {
84 unsigned int code;
85 unsigned int bpp;
86 u32 pixelformat;
87 bool bayer;
88 };
89
90 /**
91 * struct vimc_ent_device - core struct that represents a node in the topology
92 *
93 * @ent: the pointer to struct media_entity for the node
94 * @pads: the list of pads of the node
95 * @process_frame: callback send a frame to that node
96 * @vdev_get_format: callback that returns the current format a pad, used
97 * only when is_media_entity_v4l2_video_device(ent) returns
98 * true
99 *
100 * Each node of the topology must create a vimc_ent_device struct. Depending on
101 * the node it will be of an instance of v4l2_subdev or video_device struct
102 * where both contains a struct media_entity.
103 * Those structures should embedded the vimc_ent_device struct through
104 * v4l2_set_subdevdata() and video_set_drvdata() respectivaly, allowing the
105 * vimc_ent_device struct to be retrieved from the corresponding struct
106 * media_entity
107 */
108 struct vimc_ent_device {
109 struct media_entity *ent;
110 struct media_pad *pads;
111 void * (*process_frame)(struct vimc_ent_device *ved,
112 const void *frame);
113 void (*vdev_get_format)(struct vimc_ent_device *ved,
114 struct v4l2_pix_format *fmt);
115 };
116
117 /**
118 * vimc_pads_init - initialize pads
119 *
120 * @num_pads: number of pads to initialize
121 * @pads_flags: flags to use in each pad
122 *
123 * Helper functions to allocate/initialize pads
124 */
125 struct media_pad *vimc_pads_init(u16 num_pads,
126 const unsigned long *pads_flag);
127
128 /**
129 * vimc_pads_cleanup - free pads
130 *
131 * @pads: pointer to the pads
132 *
133 * Helper function to free the pads initialized with vimc_pads_init
134 */
vimc_pads_cleanup(struct media_pad * pads)135 static inline void vimc_pads_cleanup(struct media_pad *pads)
136 {
137 kfree(pads);
138 }
139
140 /**
141 * vimc_pipeline_s_stream - start stream through the pipeline
142 *
143 * @ent: the pointer to struct media_entity for the node
144 * @enable: 1 to start the stream and 0 to stop
145 *
146 * Helper function to call the s_stream of the subdevices connected
147 * in all the sink pads of the entity
148 */
149 int vimc_pipeline_s_stream(struct media_entity *ent, int enable);
150
151 /**
152 * vimc_pix_map_by_index - get vimc_pix_map struct by its index
153 *
154 * @i: index of the vimc_pix_map struct in vimc_pix_map_list
155 */
156 const struct vimc_pix_map *vimc_pix_map_by_index(unsigned int i);
157
158 /**
159 * vimc_pix_map_by_code - get vimc_pix_map struct by media bus code
160 *
161 * @code: media bus format code defined by MEDIA_BUS_FMT_* macros
162 */
163 const struct vimc_pix_map *vimc_pix_map_by_code(u32 code);
164
165 /**
166 * vimc_pix_map_by_pixelformat - get vimc_pix_map struct by v4l2 pixel format
167 *
168 * @pixelformat: pixel format devined by V4L2_PIX_FMT_* macros
169 */
170 const struct vimc_pix_map *vimc_pix_map_by_pixelformat(u32 pixelformat);
171
172 /**
173 * vimc_ent_sd_register - initialize and register a subdev node
174 *
175 * @ved: the vimc_ent_device struct to be initialize
176 * @sd: the v4l2_subdev struct to be initialize and registered
177 * @v4l2_dev: the v4l2 device to register the v4l2_subdev
178 * @name: name of the sub-device. Please notice that the name must be
179 * unique.
180 * @function: media entity function defined by MEDIA_ENT_F_* macros
181 * @num_pads: number of pads to initialize
182 * @pads_flag: flags to use in each pad
183 * @sd_ops: pointer to &struct v4l2_subdev_ops.
184 *
185 * Helper function initialize and register the struct vimc_ent_device and struct
186 * v4l2_subdev which represents a subdev node in the topology
187 */
188 int vimc_ent_sd_register(struct vimc_ent_device *ved,
189 struct v4l2_subdev *sd,
190 struct v4l2_device *v4l2_dev,
191 const char *const name,
192 u32 function,
193 u16 num_pads,
194 const unsigned long *pads_flag,
195 const struct v4l2_subdev_ops *sd_ops);
196
197 /**
198 * vimc_ent_sd_unregister - cleanup and unregister a subdev node
199 *
200 * @ved: the vimc_ent_device struct to be cleaned up
201 * @sd: the v4l2_subdev struct to be unregistered
202 *
203 * Helper function cleanup and unregister the struct vimc_ent_device and struct
204 * v4l2_subdev which represents a subdev node in the topology
205 */
206 void vimc_ent_sd_unregister(struct vimc_ent_device *ved,
207 struct v4l2_subdev *sd);
208
209 /**
210 * vimc_link_validate - validates a media link
211 *
212 * @link: pointer to &struct media_link
213 *
214 * This function calls validates if a media link is valid for streaming.
215 */
216 int vimc_link_validate(struct media_link *link);
217
218 #endif
219