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/*
* Copyright (c) 2015 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __video_console_h
#define __video_console_h
#define VID_FRAC_DIV 256
#define VID_TO_PIXEL(x) ((x) / VID_FRAC_DIV)
#define VID_TO_POS(x) ((x) * VID_FRAC_DIV)
/**
* struct vidconsole_priv - uclass-private data about a console device
*
* Drivers must set up @rows, @cols, @x_charsize, @y_charsize in their probe()
* method. Drivers may set up @xstart_frac if desired.
*
* @sdev: stdio device, acting as an output sink
* @xcur_frac: Current X position, in fractional units (VID_TO_POS(x))
* @curr_row: Current Y position in pixels (0=top)
* @rows: Number of text rows
* @cols: Number of text columns
* @x_charsize: Character width in pixels
* @y_charsize: Character height in pixels
* @tab_width_frac: Tab width in fractional units
* @xsize_frac: Width of the display in fractional units
* @xstart_frac: Left margin for the text console in fractional units
* @last_ch: Last character written to the text console on this line
*/
struct vidconsole_priv {
struct stdio_dev sdev;
int xcur_frac;
int ycur;
int rows;
int cols;
int x_charsize;
int y_charsize;
int tab_width_frac;
int xsize_frac;
int xstart_frac;
int last_ch;
};
/**
* struct vidconsole_ops - Video console operations
*
* These operations work on either an absolute console position (measured
* in pixels) or a text row number (measured in rows, where each row consists
* of an entire line of text - typically 16 pixels).
*/
struct vidconsole_ops {
/**
* putc_xy() - write a single character to a position
*
* @dev: Device to write to
* @x_frac: Fractional pixel X position (0=left-most pixel) which
* is the X position multipled by VID_FRAC_DIV.
* @y: Pixel Y position (0=top-most pixel)
* @ch: Character to write
* @return number of fractional pixels that the cursor should move,
* if all is OK, -EAGAIN if we ran out of space on this line, other -ve
* on error
*/
int (*putc_xy)(struct udevice *dev, uint x_frac, uint y, char ch);
/**
* move_rows() - Move text rows from one place to another
*
* @dev: Device to adjust
* @rowdst: Destination text row (0=top)
* @rowsrc: Source start text row
* @count: Number of text rows to move
* @return 0 if OK, -ve on error
*/
int (*move_rows)(struct udevice *dev, uint rowdst, uint rowsrc,
uint count);
/**
* set_row() - Set the colour of a text row
*
* Every pixel contained within the text row is adjusted
*
* @dev: Device to adjust
* @row: Text row to adjust (0=top)
* @clr: Raw colour (pixel value) to write to each pixel
* @return 0 if OK, -ve on error
*/
int (*set_row)(struct udevice *dev, uint row, int clr);
/**
* entry_start() - Indicate that text entry is starting afresh
*
* Consoles which use proportional fonts need to track the position of
* each character output so that backspace will return to the correct
* place. This method signals to the console driver that a new entry
* line is being start (e.g. the user pressed return to start a new
* command). The driver can use this signal to empty its list of
* positions.
*/
int (*entry_start)(struct udevice *dev);
/**
* backspace() - Handle erasing the last character
*
* With proportional fonts the vidconsole uclass cannot itself erase
* the previous character. This optional method will be called when
* a backspace is needed. The driver should erase the previous
* character and update the cursor position (xcur_frac, ycur) to the
* start of the previous character.
*
* If not implement, default behaviour will work for fixed-width
* characters.
*/
int (*backspace)(struct udevice *dev);
};
/* Get a pointer to the driver operations for a video console device */
#define vidconsole_get_ops(dev) ((struct vidconsole_ops *)(dev)->driver->ops)
/**
* vidconsole_putc_xy() - write a single character to a position
*
* @dev: Device to write to
* @x_frac: Fractional pixel X position (0=left-most pixel) which
* is the X position multipled by VID_FRAC_DIV.
* @y: Pixel Y position (0=top-most pixel)
* @ch: Character to write
* @return number of fractional pixels that the cursor should move,
* if all is OK, -EAGAIN if we ran out of space on this line, other -ve
* on error
*/
int vidconsole_putc_xy(struct udevice *dev, uint x, uint y, char ch);
/**
* vidconsole_move_rows() - Move text rows from one place to another
*
* @dev: Device to adjust
* @rowdst: Destination text row (0=top)
* @rowsrc: Source start text row
* @count: Number of text rows to move
* @return 0 if OK, -ve on error
*/
int vidconsole_move_rows(struct udevice *dev, uint rowdst, uint rowsrc,
uint count);
/**
* vidconsole_set_row() - Set the colour of a text row
*
* Every pixel contained within the text row is adjusted
*
* @dev: Device to adjust
* @row: Text row to adjust (0=top)
* @clr: Raw colour (pixel value) to write to each pixel
* @return 0 if OK, -ve on error
*/
int vidconsole_set_row(struct udevice *dev, uint row, int clr);
/**
* vidconsole_put_char() - Output a character to the current console position
*
* Outputs a character to the console and advances the cursor. This function
* handles wrapping to new lines and scrolling the console. Special
* characters are handled also: \n, \r, \b and \t.
*
* The device always starts with the cursor at position 0,0 (top left). It
* can be adjusted manually using vidconsole_position_cursor().
*
* @dev: Device to adjust
* @ch: Character to write
* @return 0 if OK, -ve on error
*/
int vidconsole_put_char(struct udevice *dev, char ch);
/**
* vidconsole_position_cursor() - Move the text cursor
*
* @dev: Device to adjust
* @col: New cursor text column
* @row: New cursor text row
* @return 0 if OK, -ve on error
*/
void vidconsole_position_cursor(struct udevice *dev, unsigned col,
unsigned row);
#endif
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