/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (c) 2015 Google, Inc
 */

#ifndef __video_console_h
#define __video_console_h

#include <video.h>

#define VID_FRAC_DIV    256

#define VID_TO_PIXEL(x) ((x) / VID_FRAC_DIV)
#define VID_TO_POS(x)   ((x) * VID_FRAC_DIV)

/*
 * The 16 colors supported by the console
 */
enum color_idx {
        VID_BLACK = 0,
        VID_RED,
        VID_GREEN,
        VID_BROWN,
        VID_BLUE,
        VID_MAGENTA,
        VID_CYAN,
        VID_LIGHT_GRAY,
        VID_GRAY,
        VID_LIGHT_RED,
        VID_LIGTH_GREEN,
        VID_YELLOW,
        VID_LIGHT_BLUE,
        VID_LIGHT_MAGENTA,
        VID_LIGHT_CYAN,
        VID_WHITE,

        VID_COLOR_COUNT
};

/**
 * 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))
 * @ycur:               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
 * @escape:             TRUE if currently accumulating an ANSI escape sequence
 * @escape_len:         Length of accumulated escape sequence so far
 * @col_saved:          Saved X position, in fractional units (VID_TO_POS(x))
 * @row_saved:          Saved Y position in pixels (0=top)
 * @escape_buf:         Buffer to accumulate escape sequence
 */
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;
        /*
         * ANSI escape sequences are accumulated character by character,
         * starting after the ESC char (0x1b) until the entire sequence
         * is consumed at which point it is acted upon.
         */
        int escape;
        int escape_len;
        int row_saved;
        int col_saved;
        char escape_buf[32];
};

/**
 * 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);

#ifdef CONFIG_DM_VIDEO

/**
 * vid_console_color() - convert a color code to a pixel's internal
 * representation
 *
 * The caller has to guarantee that the color index is less than
 * VID_COLOR_COUNT.
 *
 * @priv        private data of the console device
 * @idx         color index
 * @return      color value
 */
u32 vid_console_color(struct video_priv *priv, unsigned int idx);

#endif

#endif