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 );
276