include/video_console.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright (c) 2015 Google, Inc
   4  */
   5
   6 #ifndef __video_console_h
   7 #define __video_console_h
   8
   9 #include <video.h>
  10
  11 #define VID_FRAC_DIV    256
  12
  13 #define VID_TO_PIXEL(x) ((x) / VID_FRAC_DIV)
  14 #define VID_TO_POS(x)   ((x) * VID_FRAC_DIV)
  15
  16 /*
  17  * The 16 colors supported by the console
  18  */
  19 enum color_idx {
  20         VID_BLACK = 0,
  21         VID_RED,
  22         VID_GREEN,
  23         VID_BROWN,
  24         VID_BLUE,
  25         VID_MAGENTA,
  26         VID_CYAN,
  27         VID_LIGHT_GRAY,
  28         VID_GRAY,
  29         VID_LIGHT_RED,
  30         VID_LIGTH_GREEN,
  31         VID_YELLOW,
  32         VID_LIGHT_BLUE,
  33         VID_LIGHT_MAGENTA,
  34         VID_LIGHT_CYAN,
  35         VID_WHITE,
  36
  37         VID_COLOR_COUNT
  38 };
  39
  40 /**
  41  * struct vidconsole_priv - uclass-private data about a console device
  42  *
  43  * Drivers must set up @rows, @cols, @x_charsize, @y_charsize in their probe()
  44  * method. Drivers may set up @xstart_frac if desired.
  45  *
  46  * @sdev:               stdio device, acting as an output sink
  47  * @xcur_frac:          Current X position, in fractional units (VID_TO_POS(x))
  48  * @ycur:               Current Y position in pixels (0=top)
  49  * @rows:               Number of text rows
  50  * @cols:               Number of text columns
  51  * @x_charsize:         Character width in pixels
  52  * @y_charsize:         Character height in pixels
  53  * @tab_width_frac:     Tab width in fractional units
  54  * @xsize_frac:         Width of the display in fractional units
  55  * @xstart_frac:        Left margin for the text console in fractional units
  56  * @last_ch:            Last character written to the text console on this line
  57  * @escape:             TRUE if currently accumulating an ANSI escape sequence
  58  * @escape_len:         Length of accumulated escape sequence so far
  59  * @col_saved:          Saved X position, in fractional units (VID_TO_POS(x))
  60  * @row_saved:          Saved Y position in pixels (0=top)
  61  * @escape_buf:         Buffer to accumulate escape sequence
  62  */
  63 struct vidconsole_priv {
  64         struct stdio_dev sdev;
  65         int xcur_frac;
  66         int ycur;
  67         int rows;
  68         int cols;
  69         int x_charsize;
  70         int y_charsize;
  71         int tab_width_frac;
  72         int xsize_frac;
  73         int xstart_frac;
  74         int last_ch;
  75         /*
  76          * ANSI escape sequences are accumulated character by character,
  77          * starting after the ESC char (0x1b) until the entire sequence
  78          * is consumed at which point it is acted upon.
  79          */
  80         int escape;
  81         int escape_len;
  82         int row_saved;
  83         int col_saved;
  84         char escape_buf[32];
  85 };
  86
  87 /**
  88  * struct vidconsole_ops - Video console operations
  89  *
  90  * These operations work on either an absolute console position (measured
  91  * in pixels) or a text row number (measured in rows, where each row consists
  92  * of an entire line of text - typically 16 pixels).
  93  */
  94 struct vidconsole_ops {
  95         /**
  96          * putc_xy() - write a single character to a position
  97          *
  98          * @dev:        Device to write to
  99          * @x_frac:     Fractional pixel X position (0=left-most pixel) which
 100          *              is the X position multipled by VID_FRAC_DIV.
 101          * @y:          Pixel Y position (0=top-most pixel)
 102          * @ch:         Character to write
 103          * @return number of fractional pixels that the cursor should move,
 104          * if all is OK, -EAGAIN if we ran out of space on this line, other -ve
 105          * on error
 106          */
 107         int (*putc_xy)(struct udevice *dev, uint x_frac, uint y, char ch);
 108
 109         /**
 110          * move_rows() - Move text rows from one place to another
 111          *
 112          * @dev:        Device to adjust
 113          * @rowdst:     Destination text row (0=top)
 114          * @rowsrc:     Source start text row
 115          * @count:      Number of text rows to move
 116          * @return 0 if OK, -ve on error
 117          */
 118         int (*move_rows)(struct udevice *dev, uint rowdst, uint rowsrc,
 119                           uint count);
 120
 121         /**
 122          * set_row() - Set the colour of a text row
 123          *
 124          * Every pixel contained within the text row is adjusted
 125          *
 126          * @dev:        Device to adjust
 127          * @row:        Text row to adjust (0=top)
 128          * @clr:        Raw colour (pixel value) to write to each pixel
 129          * @return 0 if OK, -ve on error
 130          */
 131         int (*set_row)(struct udevice *dev, uint row, int clr);
 132
 133         /**
 134          * entry_start() - Indicate that text entry is starting afresh
 135          *
 136          * Consoles which use proportional fonts need to track the position of
 137          * each character output so that backspace will return to the correct
 138          * place. This method signals to the console driver that a new entry
 139          * line is being start (e.g. the user pressed return to start a new
 140          * command). The driver can use this signal to empty its list of
 141          * positions.
 142          */
 143         int (*entry_start)(struct udevice *dev);
 144
 145         /**
 146          * backspace() - Handle erasing the last character
 147          *
 148          * With proportional fonts the vidconsole uclass cannot itself erase
 149          * the previous character. This optional method will be called when
 150          * a backspace is needed. The driver should erase the previous
 151          * character and update the cursor position (xcur_frac, ycur) to the
 152          * start of the previous character.
 153          *
 154          * If not implement, default behaviour will work for fixed-width
 155          * characters.
 156          */
 157         int (*backspace)(struct udevice *dev);
 158 };
 159
 160 /* Get a pointer to the driver operations for a video console device */
 161 #define vidconsole_get_ops(dev)  ((struct vidconsole_ops *)(dev)->driver->ops)
 162
 163 /**
 164  * vidconsole_putc_xy() - write a single character to a position
 165  *
 166  * @dev:        Device to write to
 167  * @x_frac:     Fractional pixel X position (0=left-most pixel) which
 168  *              is the X position multipled by VID_FRAC_DIV.
 169  * @y:          Pixel Y position (0=top-most pixel)
 170  * @ch:         Character to write
 171  * @return number of fractional pixels that the cursor should move,
 172  * if all is OK, -EAGAIN if we ran out of space on this line, other -ve
 173  * on error
 174  */
 175 int vidconsole_putc_xy(struct udevice *dev, uint x, uint y, char ch);
 176
 177 /**
 178  * vidconsole_move_rows() - Move text rows from one place to another
 179  *
 180  * @dev:        Device to adjust
 181  * @rowdst:     Destination text row (0=top)
 182  * @rowsrc:     Source start text row
 183  * @count:      Number of text rows to move
 184  * @return 0 if OK, -ve on error
 185  */
 186 int vidconsole_move_rows(struct udevice *dev, uint rowdst, uint rowsrc,
 187                          uint count);
 188
 189 /**
 190  * vidconsole_set_row() - Set the colour of a text row
 191  *
 192  * Every pixel contained within the text row is adjusted
 193  *
 194  * @dev:        Device to adjust
 195  * @row:        Text row to adjust (0=top)
 196  * @clr:        Raw colour (pixel value) to write to each pixel
 197  * @return 0 if OK, -ve on error
 198  */
 199 int vidconsole_set_row(struct udevice *dev, uint row, int clr);
 200
 201 /**
 202  * vidconsole_put_char() - Output a character to the current console position
 203  *
 204  * Outputs a character to the console and advances the cursor. This function
 205  * handles wrapping to new lines and scrolling the console. Special
 206  * characters are handled also: \n, \r, \b and \t.
 207  *
 208  * The device always starts with the cursor at position 0,0 (top left). It
 209  * can be adjusted manually using vidconsole_position_cursor().
 210  *
 211  * @dev:        Device to adjust
 212  * @ch:         Character to write
 213  * @return 0 if OK, -ve on error
 214  */
 215 int vidconsole_put_char(struct udevice *dev, char ch);
 216
 217 /**
 218  * vidconsole_position_cursor() - Move the text cursor
 219  *
 220  * @dev:        Device to adjust
 221  * @col:        New cursor text column
 222  * @row:        New cursor text row
 223  * @return 0 if OK, -ve on error
 224  */
 225 void vidconsole_position_cursor(struct udevice *dev, unsigned col,
 226                                 unsigned row);
 227
 228 #ifdef CONFIG_DM_VIDEO
 229
 230 /**
 231  * vid_console_color() - convert a color code to a pixel's internal
 232  * representation
 233  *
 234  * The caller has to guarantee that the color index is less than
 235  * VID_COLOR_COUNT.
 236  *
 237  * @priv        private data of the console device
 238  * @idx         color index
 239  * @return      color value
 240  */
 241 u32 vid_console_color(struct video_priv *priv, unsigned int idx);
 242
 243 #endif
 244
 245 #endif