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[u-boot] / 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 );