1 /* SPDX-License-Identifier: GPL-2.0+ */
4 * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
10 struct video_osd_info {
11 /* The width of the OSD display in columns */
13 /* The height of the OSD display in rows */
15 /* The major version of the OSD device */
17 /* The minor version of the OSD device */
22 * struct video_osd_ops - driver operations for OSD uclass
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.
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).
34 * Functions to read device information and set the size of the virtual OSD
35 * screen (in rows and columns) are also supported.
37 * Drivers should support these operations unless otherwise noted. These
38 * operations are intended to be used by uclass code, not directly from
41 struct video_osd_ops {
43 * get_info() - Get information about a OSD instance
45 * A OSD instance may keep some internal data about itself. This
46 * function can be used to access this data.
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.
53 int (*get_info)(struct udevice *dev, struct video_osd_info *info);
56 * set_mem() - Write driver-specific text data to OSD screen
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.
64 * For example a invocation of
66 * video_osd_set_mem(dev, 0, 0, "A", 1, 10);
68 * will write the device-specific text data "A" to the positions (0, 0)
69 * to (9, 0) on the OSD.
71 * Device-specific text data may, e.g. be a special encoding of glyphs
72 * to display and color values in binary format.
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.
83 int (*set_mem)(struct udevice *dev, uint col, uint row, u8 *buf,
84 size_t buflen, uint count);
87 * set_size() - Set the position and dimension of the OSD's
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.
95 int (*set_size)(struct udevice *dev, uint col, uint row);
98 * print() - Print a string in a given color to specified coordinates
101 * @dev: OSD instance to write to.
102 * @col The x-coordinate of the position the string should be
104 * @row The y-coordinate of the position the string should be
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.
113 int (*print)(struct udevice *dev, uint col, uint row, ulong color,
117 #define video_osd_get_ops(dev) ((struct video_osd_ops *)(dev)->driver->ops)
120 * video_osd_get_info() - Get information about a OSD instance
122 * A OSD instance may keep some internal data about itself. This function can
123 * be used to access this data.
125 * @dev: OSD instance to query.
126 * @info: Pointer to a structure that takes the information read from the
128 * Return: 0 if OK, -ve on error.
130 int video_osd_get_info(struct udevice *dev, struct video_osd_info *info);
133 * video_osd_set_mem() - Write text data to OSD memory
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.
141 * For example a invocation of
143 * video_osd_set_mem(dev, 0, 0, "A", 1, 10);
145 * will write the device-specific text data "A" to the positions (0, 0) to (9,
148 * Device-specific text data may, e.g. be a special encoding of glyphs to
149 * display and color values in binary format.
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.
160 int video_osd_set_mem(struct udevice *dev, uint col, uint row, u8 *buf,
161 size_t buflen, uint count);
164 * video_osd_set_size() - Set the position and dimension of the OSD's
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.
172 int video_osd_set_size(struct udevice *dev, uint col, uint row);
175 * video_osd_print() - Print a string in a given color to specified coordinates
178 * @dev: OSD instance to write to.
179 * @col The x-coordinate of the position the string should be written
181 * @row The y-coordinate of the position the string should be written
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.
189 int video_osd_print(struct udevice *dev, uint col, uint row, ulong color,
192 #endif /* !_VIDEO_OSD_H_ */