blob: 01ac94b425c1f62dd6be7fe906633e0fe960a2f9 [file] [log] [blame]
Mario Six39a336f2018-09-27 09:19:29 +02001/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * (C) Copyright 2017
4 * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
5 */
6
7#ifndef _VIDEO_OSD_H_
8#define _VIDEO_OSD_H_
9
10struct video_osd_info {
11 /* The width of the OSD display in columns */
12 uint width;
13 /* The height of the OSD display in rows */
14 uint height;
15 /* The major version of the OSD device */
16 uint major_version;
17 /* The minor version of the OSD device */
18 uint minor_version;
19};
20
21/**
22 * struct video_osd_ops - driver operations for OSD uclass
23 *
24 * The OSD uclass implements support for text-oriented on-screen displays,
25 * which are taken to be devices that independently display a graphical
26 * text-based overlay over the video output of an associated display.
27 *
28 * The functions defined by the uclass support writing text to the display in
29 * either a generic form (by specifying a string, a driver-specific color value
30 * for the text, and screen coordinates in rows and columns) or a
31 * driver-specific form (by specifying "raw" driver-specific data to display at
32 * a given coordinate).
33 *
34 * Functions to read device information and set the size of the virtual OSD
35 * screen (in rows and columns) are also supported.
36 *
37 * Drivers should support these operations unless otherwise noted. These
38 * operations are intended to be used by uclass code, not directly from
39 * other code.
40 */
41struct video_osd_ops {
42 /**
43 * get_info() - Get information about a OSD instance
44 *
45 * A OSD instance may keep some internal data about itself. This
46 * function can be used to access this data.
47 *
48 * @dev: OSD instance to query.
49 * @info: Pointer to a structure that takes the information read
50 * from the OSD instance.
51 * @return 0 if OK, -ve on error.
52 */
53 int (*get_info)(struct udevice *dev, struct video_osd_info *info);
54
55 /**
56 * set_mem() - Write driver-specific text data to OSD screen
57 *
58 * The passed data are device-specific, and it's up to the driver how
59 * to interpret them. How the count parameter is interpreted is also
60 * driver-specific; most likely the given data will be written to the
61 * OSD count times back-to-back, which is e.g. convenient for filling
62 * areas of the OSD with a single character.
63 *
64 * For example a invocation of
65 *
66 * video_osd_set_mem(dev, 0, 0, "A", 1, 10);
67 *
68 * will write the device-specific text data "A" to the positions (0, 0)
69 * to (9, 0) on the OSD.
70 *
71 * Device-specific text data may, e.g. be a special encoding of glyphs
72 * to display and color values in binary format.
73 *
74 * @dev: OSD instance to write to.
75 * @col: Horizontal character coordinate to write to.
76 * @row Vertical character coordinate to write to.
77 * @buf: Array containing device-specific data to write to the
78 * specified coordinate on the OSD screen.
79 * @buflen: Length of the data in the passed buffer (in byte).
80 * @count: Write count many repetitions of the given text data
81 * @return 0 if OK, -ve on error.
82 */
83 int (*set_mem)(struct udevice *dev, uint col, uint row, u8 *buf,
84 size_t buflen, uint count);
85
86 /**
87 * set_size() - Set the position and dimension of the OSD's
88 * writeable window
89 *
90 * @dev: OSD instance to write to.
91 * @col The number of characters in the window's columns
92 * @row The number of characters in the window's rows
93 * @return 0 if OK, -ve on error.
94 */
95 int (*set_size)(struct udevice *dev, uint col, uint row);
96
97 /**
98 * print() - Print a string in a given color to specified coordinates
99 * on the OSD
100 *
101 * @dev: OSD instance to write to.
102 * @col The x-coordinate of the position the string should be
103 * written to
104 * @row The y-coordinate of the position the string should be
105 * written to
106 * @color: The color in which the specified string should be
107 * printed; the interpretation of the value is
108 * driver-specific, and possible values should be defined
109 * e.g. in a driver include file.
110 * @text: The string data that should be printed on the OSD
111 * @return 0 if OK, -ve on error.
112 */
113 int (*print)(struct udevice *dev, uint col, uint row, ulong color,
114 char *text);
115};
116
117#define video_osd_get_ops(dev) ((struct video_osd_ops *)(dev)->driver->ops)
118
119/**
120 * video_osd_get_info() - Get information about a OSD instance
121 *
122 * A OSD instance may keep some internal data about itself. This function can
123 * be used to access this data.
124 *
125 * @dev: OSD instance to query.
126 * @info: Pointer to a structure that takes the information read from the
127 * OSD instance.
128 * @return 0 if OK, -ve on error.
129 */
130int video_osd_get_info(struct udevice *dev, struct video_osd_info *info);
131
132/**
133 * video_osd_set_mem() - Write text data to OSD memory
134 *
135 * The passed data are device-specific, and it's up to the driver how to
136 * interpret them. How the count parameter is interpreted is also
137 * driver-specific; most likely the given data will be written to the OSD count
138 * times back-to-back, which is e.g. convenient for filling areas of the OSD
139 * with a single character.
140 *
141 * For example a invocation of
142 *
143 * video_osd_set_mem(dev, 0, 0, "A", 1, 10);
144 *
145 * will write the device-specific text data "A" to the positions (0, 0) to (9,
146 * 0) on the OSD.
147 *
148 * Device-specific text data may, e.g. be a special encoding of glyphs to
149 * display and color values in binary format.
150 *
151 * @dev: OSD instance to write to.
152 * @col: Horizontal character coordinate to write to.
153 * @row Vertical character coordinate to write to.
154 * @buf: Array containing device-specific data to write to the specified
155 * coordinate on the OSD screen.
156 * @buflen: Length of the data in the passed buffer (in byte).
157 * @count: Write count many repetitions of the given text data
158 * @return 0 if OK, -ve on error.
159 */
160int video_osd_set_mem(struct udevice *dev, uint col, uint row, u8 *buf,
161 size_t buflen, uint count);
162
163/**
164 * video_osd_set_size() - Set the position and dimension of the OSD's
165 * writeable window
166 *
167 * @dev: OSD instance to write to.
168 * @col The number of characters in the window's columns
169 * @row The number of characters in the window's rows
170 * @return 0 if OK, -ve on error.
171 */
172int video_osd_set_size(struct udevice *dev, uint col, uint row);
173
174/**
175 * video_osd_print() - Print a string in a given color to specified coordinates
176 * on the OSD
177 *
178 * @dev: OSD instance to write to.
179 * @col The x-coordinate of the position the string should be written
180 * to
181 * @row The y-coordinate of the position the string should be written
182 * to
183 * @color: The color in which the specified string should be printed; the
184 * interpretation of the value is driver-specific, and possible
185 * values should be defined e.g. in a driver include file.
186 * @text: The string data that should be printed on the OSD
187 * @return 0 if OK, -ve on error.
188 */
189int video_osd_print(struct udevice *dev, uint col, uint row, ulong color,
190 char *text);
191
192#endif /* !_VIDEO_OSD_H_ */