aboutsummaryrefslogtreecommitdiff
path: root/util-linux/fbset.c
blob: 7ca41733b36edc8b54e72b49186f96e2c6fb17c9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
/* vi: set sw=4 ts=4: */
/*
 * Mini fbset implementation for busybox
 *
 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * This is a from-scratch implementation of fbset; but the de facto fbset
 * implementation was a good reference. fbset (original) is released under
 * the GPL, and is (c) 1995-1999 by: 
 *     Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
 */

#include "internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <sys/ioctl.h>
#include <linux/fb.h>
#include <linux/version.h>

#define PERROR(ctx)   do { perror(ctx); exit(1); } while(0)

#ifndef KERNEL_VERSION
#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
#endif

#define DEFAULTFBDEV  "/dev/fb0"
#define DEFAULTFBMODE "/etc/fb.modes"

#define OPT_CHANGE    1
#define OPT_INFO      (1 << 1)
#define OPT_READMODE  (1 << 2)

#define CMD_HELP        0
#define CMD_FB		1
#define CMD_DB		2
#define CMD_GEOMETRY	3
#define CMD_TIMING	4
#define CMD_ACCEL	5
#define CMD_HSYNC	6
#define CMD_VSYNC	7
#define CMD_LACED	8
#define CMD_DOUBLE	9
/* #define CMD_XCOMPAT     10 */
#define CMD_ALL         11
#define CMD_INFO        12

#ifdef BB_FEATURE_FBSET_FANCY
#define CMD_XRES	13
#define CMD_YRES	14
#define CMD_VXRES	15
#define CMD_VYRES	16
#define CMD_DEPTH	17
#define CMD_MATCH	18
#define CMD_PIXCLOCK	19
#define CMD_LEFT	20
#define CMD_RIGHT	21
#define CMD_UPPER	22
#define CMD_LOWER	23
#define CMD_HSLEN	24
#define CMD_VSLEN	25
#define CMD_CSYNC	26
#define CMD_GSYNC	27
#define CMD_EXTSYNC	28
#define CMD_BCAST	29
#define CMD_RGBA	30
#define CMD_STEP	31
#define CMD_MOVE	32
#endif

static unsigned int g_options = 0;

struct cmdoptions_t {
	char *name;
	unsigned char param_count;
	unsigned char code;
} g_cmdoptions[] = {
	{
	"-h", 0, CMD_HELP}, {
	"-fb", 1, CMD_FB}, {
	"-db", 1, CMD_DB}, {
	"-a", 0, CMD_ALL}, {
	"-i", 0, CMD_INFO}, {
	"-g", 5, CMD_GEOMETRY}, {
	"-t", 7, CMD_TIMING}, {
	"-accel", 1, CMD_ACCEL}, {
	"-hsync", 1, CMD_HSYNC}, {
	"-vsync", 1, CMD_VSYNC}, {
	"-laced", 1, CMD_LACED}, {
	"-double", 1, CMD_DOUBLE},
#ifdef BB_FEATURE_FBSET_FANCY
	{
	"--help", 0, CMD_HELP}, {
	"-all", 0, CMD_ALL}, {
	"-xres", 1, CMD_XRES}, {
	"-yres", 1, CMD_YRES}, {
	"-vxres", 1, CMD_VXRES}, {
	"-vyres", 1, CMD_VYRES}, {
	"-depth", 1, CMD_DEPTH}, {
	"-match", 0, CMD_MATCH}, {
	"--geometry", 5, CMD_GEOMETRY}, {
	"-pixclock", 1, CMD_PIXCLOCK}, {
	"-left", 1, CMD_LEFT}, {
	"-right", 1, CMD_RIGHT}, {
	"-upper", 1, CMD_UPPER}, {
	"-lower", 1, CMD_LOWER}, {
	"-hslen", 1, CMD_HSLEN}, {
	"-vslen", 1, CMD_VSLEN}, {
	"--timings", 7, CMD_TIMING}, {
	"-csync", 1, CMD_CSYNC}, {
	"-gsync", 1, CMD_GSYNC}, {
	"-extsync", 1, CMD_EXTSYNC}, {
	"-bcast", 1, CMD_BCAST}, {
	"-rgba", 1, CMD_RGBA}, {
	"-step", 1, CMD_STEP}, {
	"-move", 1, CMD_MOVE},
#endif
	{
	0, 0, 0}
};

static int readmode(struct fb_var_screeninfo *base, const char *fn,
					const char *mode)
{
#ifdef BB_FBSET_READMODE
	FILE *f;
	char buf[256];
	char *p = buf;

	if ((f = fopen(fn, "r")) == NULL)
		PERROR("readmode(fopen)");
	while (!feof(f)) {
		fgets(buf, sizeof(buf), f);
		if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
			p += 5;
			if ((p = strstr(buf, mode))) {
				p += strlen(mode);
				if (!isspace(*p) && (*p != 0) && (*p != '"')
					&& (*p != '\r') && (*p != '\n'))
					continue;	/* almost, but not quite */
				while (!feof(f)) {
					fgets(buf, sizeof(buf), f);
					if (!strstr(buf, "endmode"))
						return 1;
				}
			}
		}
	}
#else
	errorMsg( "mode reading not compiled in\n");
#endif
	return 0;
}

static void setmode(struct fb_var_screeninfo *base,
					struct fb_var_screeninfo *set)
{
	if ((int) set->xres > 0)
		base->xres = set->xres;
	if ((int) set->yres > 0)
		base->yres = set->yres;
	if ((int) set->xres_virtual > 0)
		base->xres_virtual = set->xres_virtual;
	if ((int) set->yres_virtual > 0)
		base->yres_virtual = set->yres_virtual;
	if ((int) set->bits_per_pixel > 0)
		base->bits_per_pixel = set->bits_per_pixel;
}

static void showmode(struct fb_var_screeninfo *v)
{
	double drate = 0, hrate = 0, vrate = 0;

	if (v->pixclock) {
		drate = 1e12 / v->pixclock;
		hrate =
			drate / (v->left_margin + v->xres + v->right_margin +
					 v->hsync_len);
		vrate =
			hrate / (v->upper_margin + v->yres + v->lower_margin +
					 v->vsync_len);
	}
	printf("\nmode \"%ux%u-%u\"\n", v->xres, v->yres, (int) (vrate + 0.5));
#ifdef BB_FEATURE_FBSET_FANCY
	printf("\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n", drate / 1e6,
		   hrate / 1e3, vrate);
#endif
	printf("\tgeometry %u %u %u %u %u\n", v->xres, v->yres,
		   v->xres_virtual, v->yres_virtual, v->bits_per_pixel);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
	printf("\ttimings %u %u %u %u %u %u %u\n", v->pixclock, v->left_margin,
		   v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
		   v->vsync_len);
	printf("\taccel %s\n", (v->accel_flags > 0 ? "true" : "false"));
#else
	printf("\ttimings %lu %lu %lu %lu %lu %lu %lu\n", v->pixclock,
		   v->left_margin, v->right_margin, v->upper_margin,
		   v->lower_margin, v->hsync_len, v->vsync_len);
#endif
	printf("\trgba %u/%u,%u/%u,%u/%u,%u/%u\n", v->red.length,
		   v->red.offset, v->green.length, v->green.offset, v->blue.length,
		   v->blue.offset, v->transp.length, v->transp.offset);
	printf("endmode\n");
}

static void fbset_usage(void)
{
	int i;

#ifndef STANDALONE
	fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n",
			BB_VER, BB_BT);
#endif
	fprintf(stderr, "Usage: fbset [options] [mode]\n");
	fprintf(stderr, "\tThe following options are recognized:\n");
	for (i = 0; g_cmdoptions[i].name; i++)
		fprintf(stderr, "\t\t%s\n", g_cmdoptions[i].name);
	exit(-1);
}

#ifdef STANDALONE
int main(int argc, char **argv)
#else
extern int fbset_main(int argc, char **argv)
#endif
{
	struct fb_var_screeninfo var, varset;
	int fh, i;
	char *fbdev = DEFAULTFBDEV;
	char *modefile = DEFAULTFBMODE;
	char *thisarg, *mode = NULL;

	memset(&varset, 0xFF, sizeof(varset));

	/* parse cmd args.... why do they have to make things so difficult? */
	argv++;
	argc--;
	for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
		for (i = 0; g_cmdoptions[i].name; i++) {
			if (!strcmp(thisarg, g_cmdoptions[i].name)) {
				if (argc - 1 < g_cmdoptions[i].param_count)
					fbset_usage();
				switch (g_cmdoptions[i].code) {
				case CMD_HELP:
					fbset_usage();
				case CMD_FB:
					fbdev = argv[1];
					break;
				case CMD_DB:
					modefile = argv[1];
					break;
				case CMD_GEOMETRY:
					varset.xres = strtoul(argv[1], 0, 0);
					varset.yres = strtoul(argv[2], 0, 0);
					varset.xres_virtual = strtoul(argv[3], 0, 0);
					varset.yres_virtual = strtoul(argv[4], 0, 0);
					varset.bits_per_pixel = strtoul(argv[5], 0, 0);
					break;
				case CMD_TIMING:
					varset.pixclock = strtoul(argv[1], 0, 0);
					varset.left_margin = strtoul(argv[2], 0, 0);
					varset.right_margin = strtoul(argv[3], 0, 0);
					varset.upper_margin = strtoul(argv[4], 0, 0);
					varset.lower_margin = strtoul(argv[5], 0, 0);
					varset.hsync_len = strtoul(argv[6], 0, 0);
					varset.vsync_len = strtoul(argv[7], 0, 0);
					break;
#ifdef BB_FEATURE_FBSET_FANCY
				case CMD_XRES:
					varset.xres = strtoul(argv[1], 0, 0);
					break;
				case CMD_YRES:
					varset.yres = strtoul(argv[1], 0, 0);
					break;
#endif
				}
				argc -= g_cmdoptions[i].param_count;
				argv += g_cmdoptions[i].param_count;
				break;
			}
		}
		if (!g_cmdoptions[i].name) {
			if (argc == 1) {
				mode = *argv;
				g_options |= OPT_READMODE;
			} else {
				fbset_usage();
			}
		}
	}

	if ((fh = open(fbdev, O_RDONLY)) < 0)
		PERROR("fbset(open)");
	if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
		PERROR("fbset(ioctl)");
	if (g_options & OPT_READMODE) {
		if (!readmode(&var, modefile, mode)) {
			fprintf(stderr, "Unknown video mode `%s'\n", mode);
			exit(1);
		}
	}

	setmode(&var, &varset);
	if (g_options & OPT_CHANGE)
		if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
			PERROR("fbset(ioctl)");
	showmode(&var);
	/* Don't close the file, as exiting will take care of that */
	/* close(fh); */

	exit (TRUE);
}