drivers/video/vidconsole-uclass.c

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  * (C) Copyright 2001-2015
   4  * DENX Software Engineering -- wd@denx.de
   5  * Compulab Ltd - http://compulab.co.il/
   6  * Bernecker & Rainer Industrieelektronik GmbH - http://www.br-automation.com
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <dm.h>
  13 #include <video.h>
  14 #include <video_console.h>
  15 #include <video_font.h>         /* Get font data, width and height */
  16
  17 /* By default we scroll by a single line */
  18 #ifndef CONFIG_CONSOLE_SCROLL_LINES
  19 #define CONFIG_CONSOLE_SCROLL_LINES 1
  20 #endif
  21
  22 int vidconsole_putc_xy(struct udevice *dev, uint x, uint y, char ch)
  23 {
  24         struct vidconsole_ops *ops = vidconsole_get_ops(dev);
  25
  26         if (!ops->putc_xy)
  27                 return -ENOSYS;
  28         return ops->putc_xy(dev, x, y, ch);
  29 }
  30
  31 int vidconsole_move_rows(struct udevice *dev, uint rowdst, uint rowsrc,
  32                          uint count)
  33 {
  34         struct vidconsole_ops *ops = vidconsole_get_ops(dev);
  35
  36         if (!ops->move_rows)
  37                 return -ENOSYS;
  38         return ops->move_rows(dev, rowdst, rowsrc, count);
  39 }
  40
  41 int vidconsole_set_row(struct udevice *dev, uint row, int clr)
  42 {
  43         struct vidconsole_ops *ops = vidconsole_get_ops(dev);
  44
  45         if (!ops->set_row)
  46                 return -ENOSYS;
  47         return ops->set_row(dev, row, clr);
  48 }
  49
  50 static int vidconsole_entry_start(struct udevice *dev)
  51 {
  52         struct vidconsole_ops *ops = vidconsole_get_ops(dev);
  53
  54         if (!ops->entry_start)
  55                 return -ENOSYS;
  56         return ops->entry_start(dev);
  57 }
  58
  59 /* Move backwards one space */
  60 static int vidconsole_back(struct udevice *dev)
  61 {
  62         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
  63         struct vidconsole_ops *ops = vidconsole_get_ops(dev);
  64         int ret;
  65
  66         if (ops->backspace) {
  67                 ret = ops->backspace(dev);
  68                 if (ret != -ENOSYS)
  69                         return ret;
  70         }
  71
  72         priv->xcur_frac -= VID_TO_POS(priv->x_charsize);
  73         if (priv->xcur_frac < priv->xstart_frac) {
  74                 priv->xcur_frac = (priv->cols - 1) *
  75                         VID_TO_POS(priv->x_charsize);
  76                 priv->ycur -= priv->y_charsize;
  77                 if (priv->ycur < 0)
  78                         priv->ycur = 0;
  79         }
  80
  81         return 0;
  82 }
  83
  84 /* Move to a newline, scrolling the display if necessary */
  85 static void vidconsole_newline(struct udevice *dev)
  86 {
  87         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
  88         struct udevice *vid_dev = dev->parent;
  89         struct video_priv *vid_priv = dev_get_uclass_priv(vid_dev);
  90         const int rows = CONFIG_CONSOLE_SCROLL_LINES;
  91         int i;
  92
  93         priv->xcur_frac = priv->xstart_frac;
  94         priv->ycur += priv->y_charsize;
  95
  96         /* Check if we need to scroll the terminal */
  97         if ((priv->ycur + priv->y_charsize) / priv->y_charsize > priv->rows) {
  98                 vidconsole_move_rows(dev, 0, rows, priv->rows - rows);
  99                 for (i = 0; i < rows; i++)
 100                         vidconsole_set_row(dev, priv->rows - i - 1,
 101                                            vid_priv->colour_bg);
 102                 priv->ycur -= rows * priv->y_charsize;
 103         }
 104         priv->last_ch = 0;
 105
 106         video_sync(dev->parent);
 107 }
 108
 109 int vidconsole_put_char(struct udevice *dev, char ch)
 110 {
 111         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
 112         int ret;
 113
 114         switch (ch) {
 115         case '\a':
 116                 /* beep */
 117                 break;
 118         case '\r':
 119                 priv->xcur_frac = priv->xstart_frac;
 120                 break;
 121         case '\n':
 122                 vidconsole_newline(dev);
 123                 vidconsole_entry_start(dev);
 124                 break;
 125         case '\t':      /* Tab (8 chars alignment) */
 126                 priv->xcur_frac = ((priv->xcur_frac / priv->tab_width_frac)
 127                                 + 1) * priv->tab_width_frac;
 128
 129                 if (priv->xcur_frac >= priv->xsize_frac)
 130                         vidconsole_newline(dev);
 131                 break;
 132         case '\b':
 133                 vidconsole_back(dev);
 134                 priv->last_ch = 0;
 135                 break;
 136         default:
 137                 /*
 138                  * Failure of this function normally indicates an unsupported
 139                  * colour depth. Check this and return an error to help with
 140                  * diagnosis.
 141                  */
 142                 ret = vidconsole_putc_xy(dev, priv->xcur_frac, priv->ycur, ch);
 143                 if (ret == -EAGAIN) {
 144                         vidconsole_newline(dev);
 145                         ret = vidconsole_putc_xy(dev, priv->xcur_frac,
 146                                                  priv->ycur, ch);
 147                 }
 148                 if (ret < 0)
 149                         return ret;
 150                 priv->xcur_frac += ret;
 151                 priv->last_ch = ch;
 152                 if (priv->xcur_frac >= priv->xsize_frac)
 153                         vidconsole_newline(dev);
 154                 break;
 155         }
 156
 157         return 0;
 158 }
 159
 160 static void vidconsole_putc(struct stdio_dev *sdev, const char ch)
 161 {
 162         struct udevice *dev = sdev->priv;
 163
 164         vidconsole_put_char(dev, ch);
 165 }
 166
 167 static void vidconsole_puts(struct stdio_dev *sdev, const char *s)
 168 {
 169         struct udevice *dev = sdev->priv;
 170
 171         while (*s)
 172                 vidconsole_put_char(dev, *s++);
 173         video_sync(dev->parent);
 174 }
 175
 176 /* Set up the number of rows and colours (rotated drivers override this) */
 177 static int vidconsole_pre_probe(struct udevice *dev)
 178 {
 179         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
 180         struct udevice *vid = dev->parent;
 181         struct video_priv *vid_priv = dev_get_uclass_priv(vid);
 182
 183         priv->xsize_frac = VID_TO_POS(vid_priv->xsize);
 184
 185         return 0;
 186 }
 187
 188 /* Register the device with stdio */
 189 static int vidconsole_post_probe(struct udevice *dev)
 190 {
 191         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
 192         struct stdio_dev *sdev = &priv->sdev;
 193
 194         if (!priv->tab_width_frac)
 195                 priv->tab_width_frac = VID_TO_POS(priv->x_charsize) * 8;
 196
 197         if (dev->seq) {
 198                 snprintf(sdev->name, sizeof(sdev->name), "vidconsole%d",
 199                          dev->seq);
 200         } else {
 201                 strcpy(sdev->name, "vidconsole");
 202         }
 203
 204         sdev->flags = DEV_FLAGS_OUTPUT;
 205         sdev->putc = vidconsole_putc;
 206         sdev->puts = vidconsole_puts;
 207         sdev->priv = dev;
 208
 209         return stdio_register(sdev);
 210 }
 211
 212 UCLASS_DRIVER(vidconsole) = {
 213         .id             = UCLASS_VIDEO_CONSOLE,
 214         .name           = "vidconsole0",
 215         .pre_probe      = vidconsole_pre_probe,
 216         .post_probe     = vidconsole_post_probe,
 217         .per_device_auto_alloc_size     = sizeof(struct vidconsole_priv),
 218 };
 219
 220 void vidconsole_position_cursor(struct udevice *dev, unsigned col, unsigned row)
 221 {
 222         struct vidconsole_priv *priv = dev_get_uclass_priv(dev);
 223         struct udevice *vid_dev = dev->parent;
 224         struct video_priv *vid_priv = dev_get_uclass_priv(vid_dev);
 225
 226         priv->xcur_frac = VID_TO_POS(min_t(short, col, vid_priv->xsize - 1));
 227         priv->ycur = min_t(short, row, vid_priv->ysize - 1);
 228 }
 229
 230 static int do_video_setcursor(cmd_tbl_t *cmdtp, int flag, int argc,
 231                               char *const argv[])
 232 {
 233         unsigned int col, row;
 234         struct udevice *dev;
 235
 236         if (argc != 3)
 237                 return CMD_RET_USAGE;
 238
 239         if (uclass_first_device_err(UCLASS_VIDEO_CONSOLE, &dev))
 240                 return CMD_RET_FAILURE;
 241         col = simple_strtoul(argv[1], NULL, 10);
 242         row = simple_strtoul(argv[2], NULL, 10);
 243         vidconsole_position_cursor(dev, col, row);
 244
 245         return 0;
 246 }
 247
 248 static int do_video_puts(cmd_tbl_t *cmdtp, int flag, int argc,
 249                          char *const argv[])
 250 {
 251         struct udevice *dev;
 252         const char *s;
 253
 254         if (argc != 2)
 255                 return CMD_RET_USAGE;
 256
 257         if (uclass_first_device_err(UCLASS_VIDEO_CONSOLE, &dev))
 258                 return CMD_RET_FAILURE;
 259         for (s = argv[1]; *s; s++)
 260                 vidconsole_put_char(dev, *s);
 261
 262         return 0;
 263 }
 264
 265 U_BOOT_CMD(
 266         setcurs, 3,     1,      do_video_setcursor,
 267         "set cursor position within screen",
 268         "    <col> <row> in character"
 269 );
 270
 271 U_BOOT_CMD(
 272         lcdputs, 2,     1,      do_video_puts,
 273         "print string on video framebuffer",
 274         "    <string>"
 275 );