39a336f116
Some devices offer a text-based OSD (on-screen display) that can be programmatically controlled (i.e. text displayed on). Add a uclass to support such devices. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Mario Six <mario.six@gdsys.cc>
193 lines
6.7 KiB
C
193 lines
6.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2017
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* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
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*/
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#ifndef _VIDEO_OSD_H_
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#define _VIDEO_OSD_H_
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struct video_osd_info {
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/* The width of the OSD display in columns */
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uint width;
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/* The height of the OSD display in rows */
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uint height;
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/* The major version of the OSD device */
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uint major_version;
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/* The minor version of the OSD device */
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uint minor_version;
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};
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/**
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* struct video_osd_ops - driver operations for OSD uclass
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*
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* The OSD uclass implements support for text-oriented on-screen displays,
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* which are taken to be devices that independently display a graphical
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* text-based overlay over the video output of an associated display.
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*
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* The functions defined by the uclass support writing text to the display in
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* either a generic form (by specifying a string, a driver-specific color value
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* for the text, and screen coordinates in rows and columns) or a
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* driver-specific form (by specifying "raw" driver-specific data to display at
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* a given coordinate).
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*
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* Functions to read device information and set the size of the virtual OSD
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* screen (in rows and columns) are also supported.
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*
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* Drivers should support these operations unless otherwise noted. These
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* operations are intended to be used by uclass code, not directly from
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* other code.
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*/
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struct video_osd_ops {
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/**
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* get_info() - Get information about a OSD instance
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*
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* A OSD instance may keep some internal data about itself. This
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* function can be used to access this data.
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*
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* @dev: OSD instance to query.
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* @info: Pointer to a structure that takes the information read
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* from the OSD instance.
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* @return 0 if OK, -ve on error.
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*/
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int (*get_info)(struct udevice *dev, struct video_osd_info *info);
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/**
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* set_mem() - Write driver-specific text data to OSD screen
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*
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* The passed data are device-specific, and it's up to the driver how
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* to interpret them. How the count parameter is interpreted is also
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* driver-specific; most likely the given data will be written to the
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* OSD count times back-to-back, which is e.g. convenient for filling
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* areas of the OSD with a single character.
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*
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* For example a invocation of
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*
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* video_osd_set_mem(dev, 0, 0, "A", 1, 10);
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*
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* will write the device-specific text data "A" to the positions (0, 0)
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* to (9, 0) on the OSD.
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*
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* Device-specific text data may, e.g. be a special encoding of glyphs
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* to display and color values in binary format.
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*
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* @dev: OSD instance to write to.
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* @col: Horizontal character coordinate to write to.
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* @row Vertical character coordinate to write to.
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* @buf: Array containing device-specific data to write to the
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* specified coordinate on the OSD screen.
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* @buflen: Length of the data in the passed buffer (in byte).
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* @count: Write count many repetitions of the given text data
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* @return 0 if OK, -ve on error.
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*/
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int (*set_mem)(struct udevice *dev, uint col, uint row, u8 *buf,
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size_t buflen, uint count);
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/**
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* set_size() - Set the position and dimension of the OSD's
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* writeable window
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*
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* @dev: OSD instance to write to.
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* @col The number of characters in the window's columns
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* @row The number of characters in the window's rows
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* @return 0 if OK, -ve on error.
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*/
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int (*set_size)(struct udevice *dev, uint col, uint row);
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/**
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* print() - Print a string in a given color to specified coordinates
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* on the OSD
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*
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* @dev: OSD instance to write to.
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* @col The x-coordinate of the position the string should be
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* written to
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* @row The y-coordinate of the position the string should be
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* written to
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* @color: The color in which the specified string should be
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* printed; the interpretation of the value is
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* driver-specific, and possible values should be defined
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* e.g. in a driver include file.
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* @text: The string data that should be printed on the OSD
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* @return 0 if OK, -ve on error.
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*/
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int (*print)(struct udevice *dev, uint col, uint row, ulong color,
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char *text);
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};
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#define video_osd_get_ops(dev) ((struct video_osd_ops *)(dev)->driver->ops)
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/**
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* video_osd_get_info() - Get information about a OSD instance
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*
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* A OSD instance may keep some internal data about itself. This function can
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* be used to access this data.
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*
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* @dev: OSD instance to query.
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* @info: Pointer to a structure that takes the information read from the
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* OSD instance.
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* @return 0 if OK, -ve on error.
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*/
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int video_osd_get_info(struct udevice *dev, struct video_osd_info *info);
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/**
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* video_osd_set_mem() - Write text data to OSD memory
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*
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* The passed data are device-specific, and it's up to the driver how to
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* interpret them. How the count parameter is interpreted is also
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* driver-specific; most likely the given data will be written to the OSD count
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* times back-to-back, which is e.g. convenient for filling areas of the OSD
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* with a single character.
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*
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* For example a invocation of
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*
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* video_osd_set_mem(dev, 0, 0, "A", 1, 10);
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*
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* will write the device-specific text data "A" to the positions (0, 0) to (9,
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* 0) on the OSD.
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*
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* Device-specific text data may, e.g. be a special encoding of glyphs to
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* display and color values in binary format.
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*
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* @dev: OSD instance to write to.
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* @col: Horizontal character coordinate to write to.
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* @row Vertical character coordinate to write to.
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* @buf: Array containing device-specific data to write to the specified
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* coordinate on the OSD screen.
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* @buflen: Length of the data in the passed buffer (in byte).
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* @count: Write count many repetitions of the given text data
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* @return 0 if OK, -ve on error.
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*/
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int video_osd_set_mem(struct udevice *dev, uint col, uint row, u8 *buf,
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size_t buflen, uint count);
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/**
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* video_osd_set_size() - Set the position and dimension of the OSD's
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* writeable window
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*
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* @dev: OSD instance to write to.
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* @col The number of characters in the window's columns
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* @row The number of characters in the window's rows
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* @return 0 if OK, -ve on error.
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*/
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int video_osd_set_size(struct udevice *dev, uint col, uint row);
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/**
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* video_osd_print() - Print a string in a given color to specified coordinates
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* on the OSD
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*
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* @dev: OSD instance to write to.
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* @col The x-coordinate of the position the string should be written
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* to
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* @row The y-coordinate of the position the string should be written
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* to
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* @color: The color in which the specified string should be printed; the
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* interpretation of the value is driver-specific, and possible
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* values should be defined e.g. in a driver include file.
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* @text: The string data that should be printed on the OSD
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* @return 0 if OK, -ve on error.
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*/
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int video_osd_print(struct udevice *dev, uint col, uint row, ulong color,
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char *text);
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#endif /* !_VIDEO_OSD_H_ */
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