Lots of updates. Finished implementing BB_FEATURE_TRIVIAL_HELP
[oweals/busybox.git] / util-linux / fbset.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Mini fbset implementation for busybox
4  *
5  * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  *
21  * This is a from-scratch implementation of fbset; but the de facto fbset
22  * implementation was a good reference. fbset (original) is released under
23  * the GPL, and is (c) 1995-1999 by: 
24  *     Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
25  */
26
27 #include "internal.h"
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <unistd.h>
31 #include <fcntl.h>
32 #include <errno.h>
33 #include <ctype.h>
34 #include <sys/ioctl.h>
35 #include <linux/fb.h>
36 #include <linux/version.h>
37
38 #define PERROR(ctx)   do { perror(ctx); exit(1); } while(0)
39
40 #ifndef KERNEL_VERSION
41 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
42 #endif
43
44 #define DEFAULTFBDEV  "/dev/fb0"
45 #define DEFAULTFBMODE "/etc/fb.modes"
46
47 #define OPT_CHANGE    1
48 #define OPT_INFO      (1 << 1)
49 #define OPT_READMODE  (1 << 2)
50
51 #define CMD_HELP        0
52 #define CMD_FB          1
53 #define CMD_DB          2
54 #define CMD_GEOMETRY    3
55 #define CMD_TIMING      4
56 #define CMD_ACCEL       5
57 #define CMD_HSYNC       6
58 #define CMD_VSYNC       7
59 #define CMD_LACED       8
60 #define CMD_DOUBLE      9
61 /* #define CMD_XCOMPAT     10 */
62 #define CMD_ALL         11
63 #define CMD_INFO        12
64
65 #ifdef BB_FEATURE_FBSET_FANCY
66 #define CMD_XRES        13
67 #define CMD_YRES        14
68 #define CMD_VXRES       15
69 #define CMD_VYRES       16
70 #define CMD_DEPTH       17
71 #define CMD_MATCH       18
72 #define CMD_PIXCLOCK    19
73 #define CMD_LEFT        20
74 #define CMD_RIGHT       21
75 #define CMD_UPPER       22
76 #define CMD_LOWER       23
77 #define CMD_HSLEN       24
78 #define CMD_VSLEN       25
79 #define CMD_CSYNC       26
80 #define CMD_GSYNC       27
81 #define CMD_EXTSYNC     28
82 #define CMD_BCAST       29
83 #define CMD_RGBA        30
84 #define CMD_STEP        31
85 #define CMD_MOVE        32
86 #endif
87
88 static unsigned int g_options = 0;
89
90 struct cmdoptions_t {
91         char *name;
92         unsigned char param_count;
93         unsigned char code;
94 } g_cmdoptions[] = {
95         {
96         "-h", 0, CMD_HELP}, {
97         "-fb", 1, CMD_FB}, {
98         "-db", 1, CMD_DB}, {
99         "-a", 0, CMD_ALL}, {
100         "-i", 0, CMD_INFO}, {
101         "-g", 5, CMD_GEOMETRY}, {
102         "-t", 7, CMD_TIMING}, {
103         "-accel", 1, CMD_ACCEL}, {
104         "-hsync", 1, CMD_HSYNC}, {
105         "-vsync", 1, CMD_VSYNC}, {
106         "-laced", 1, CMD_LACED}, {
107         "-double", 1, CMD_DOUBLE}, {
108         "-help", 0, CMD_HELP}, {
109 #ifdef BB_FEATURE_FBSET_FANCY
110         "-help", 0, CMD_HELP}, {
111         "-all", 0, CMD_ALL}, {
112         "-xres", 1, CMD_XRES}, {
113         "-yres", 1, CMD_YRES}, {
114         "-vxres", 1, CMD_VXRES}, {
115         "-vyres", 1, CMD_VYRES}, {
116         "-depth", 1, CMD_DEPTH}, {
117         "-match", 0, CMD_MATCH}, {
118         "-geometry", 5, CMD_GEOMETRY}, {
119         "-pixclock", 1, CMD_PIXCLOCK}, {
120         "-left", 1, CMD_LEFT}, {
121         "-right", 1, CMD_RIGHT}, {
122         "-upper", 1, CMD_UPPER}, {
123         "-lower", 1, CMD_LOWER}, {
124         "-hslen", 1, CMD_HSLEN}, {
125         "-vslen", 1, CMD_VSLEN}, {
126         "-timings", 7, CMD_TIMING}, {
127         "-csync", 1, CMD_CSYNC}, {
128         "-gsync", 1, CMD_GSYNC}, {
129         "-extsync", 1, CMD_EXTSYNC}, {
130         "-bcast", 1, CMD_BCAST}, {
131         "-rgba", 1, CMD_RGBA}, {
132         "-step", 1, CMD_STEP}, {
133         "-move", 1, CMD_MOVE}, {
134 #endif
135         0, 0, 0}
136 };
137
138 static int readmode(struct fb_var_screeninfo *base, const char *fn,
139                                         const char *mode)
140 {
141 #ifdef BB_FBSET_READMODE
142         FILE *f;
143         char buf[256];
144         char *p = buf;
145
146         if ((f = fopen(fn, "r")) == NULL)
147                 PERROR("readmode(fopen)");
148         while (!feof(f)) {
149                 fgets(buf, sizeof(buf), f);
150                 if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
151                         p += 5;
152                         if ((p = strstr(buf, mode))) {
153                                 p += strlen(mode);
154                                 if (!isspace(*p) && (*p != 0) && (*p != '"')
155                                         && (*p != '\r') && (*p != '\n'))
156                                         continue;       /* almost, but not quite */
157                                 while (!feof(f)) {
158                                         fgets(buf, sizeof(buf), f);
159                                         if (!strstr(buf, "endmode"))
160                                                 return 1;
161                                 }
162                         }
163                 }
164         }
165 #else
166         errorMsg( "mode reading not compiled in\n");
167 #endif
168         return 0;
169 }
170
171 static void setmode(struct fb_var_screeninfo *base,
172                                         struct fb_var_screeninfo *set)
173 {
174         if ((int) set->xres > 0)
175                 base->xres = set->xres;
176         if ((int) set->yres > 0)
177                 base->yres = set->yres;
178         if ((int) set->xres_virtual > 0)
179                 base->xres_virtual = set->xres_virtual;
180         if ((int) set->yres_virtual > 0)
181                 base->yres_virtual = set->yres_virtual;
182         if ((int) set->bits_per_pixel > 0)
183                 base->bits_per_pixel = set->bits_per_pixel;
184 }
185
186 static void showmode(struct fb_var_screeninfo *v)
187 {
188         double drate = 0, hrate = 0, vrate = 0;
189
190         if (v->pixclock) {
191                 drate = 1e12 / v->pixclock;
192                 hrate =
193                         drate / (v->left_margin + v->xres + v->right_margin +
194                                          v->hsync_len);
195                 vrate =
196                         hrate / (v->upper_margin + v->yres + v->lower_margin +
197                                          v->vsync_len);
198         }
199         printf("\nmode \"%ux%u-%u\"\n", v->xres, v->yres, (int) (vrate + 0.5));
200 #ifdef BB_FEATURE_FBSET_FANCY
201         printf("\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n", drate / 1e6,
202                    hrate / 1e3, vrate);
203 #endif
204         printf("\tgeometry %u %u %u %u %u\n", v->xres, v->yres,
205                    v->xres_virtual, v->yres_virtual, v->bits_per_pixel);
206 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
207         printf("\ttimings %u %u %u %u %u %u %u\n", v->pixclock, v->left_margin,
208                    v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
209                    v->vsync_len);
210         printf("\taccel %s\n", (v->accel_flags > 0 ? "true" : "false"));
211 #else
212         printf("\ttimings %lu %lu %lu %lu %lu %lu %lu\n", v->pixclock,
213                    v->left_margin, v->right_margin, v->upper_margin,
214                    v->lower_margin, v->hsync_len, v->vsync_len);
215 #endif
216         printf("\trgba %u/%u,%u/%u,%u/%u,%u/%u\n", v->red.length,
217                    v->red.offset, v->green.length, v->green.offset, v->blue.length,
218                    v->blue.offset, v->transp.length, v->transp.offset);
219         printf("endmode\n\n");
220 }
221
222 static void fbset_usage(void)
223 {
224 #ifndef BB_FEATURE_TRIVIAL_HELP
225         int i;
226 #endif
227
228 #ifndef STANDALONE
229         fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n",
230                         BB_VER, BB_BT);
231 #endif
232         fprintf(stderr, "Usage: fbset [options] [mode]\n");
233 #ifndef BB_FEATURE_TRIVIAL_HELP
234         fprintf(stderr, "\nShows and modifies frame buffer device settings\n\n");
235         fprintf(stderr, "The following options are recognized:\n");
236         for (i = 0; g_cmdoptions[i].name; i++)
237                 fprintf(stderr, "\t%s\n", g_cmdoptions[i].name);
238 #endif
239         exit(-1);
240 }
241
242 #ifdef STANDALONE
243 int main(int argc, char **argv)
244 #else
245 extern int fbset_main(int argc, char **argv)
246 #endif
247 {
248         struct fb_var_screeninfo var, varset;
249         int fh, i;
250         char *fbdev = DEFAULTFBDEV;
251         char *modefile = DEFAULTFBMODE;
252         char *thisarg, *mode = NULL;
253
254         memset(&varset, 0xFF, sizeof(varset));
255
256         /* parse cmd args.... why do they have to make things so difficult? */
257         argv++;
258         argc--;
259         for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
260                 for (i = 0; g_cmdoptions[i].name; i++) {
261                         if (!strcmp(thisarg, g_cmdoptions[i].name)) {
262                                 if (argc - 1 < g_cmdoptions[i].param_count)
263                                         fbset_usage();
264                                 switch (g_cmdoptions[i].code) {
265                                 case CMD_HELP:
266                                         fbset_usage();
267                                 case CMD_FB:
268                                         fbdev = argv[1];
269                                         break;
270                                 case CMD_DB:
271                                         modefile = argv[1];
272                                         break;
273                                 case CMD_GEOMETRY:
274                                         varset.xres = strtoul(argv[1], 0, 0);
275                                         varset.yres = strtoul(argv[2], 0, 0);
276                                         varset.xres_virtual = strtoul(argv[3], 0, 0);
277                                         varset.yres_virtual = strtoul(argv[4], 0, 0);
278                                         varset.bits_per_pixel = strtoul(argv[5], 0, 0);
279                                         break;
280                                 case CMD_TIMING:
281                                         varset.pixclock = strtoul(argv[1], 0, 0);
282                                         varset.left_margin = strtoul(argv[2], 0, 0);
283                                         varset.right_margin = strtoul(argv[3], 0, 0);
284                                         varset.upper_margin = strtoul(argv[4], 0, 0);
285                                         varset.lower_margin = strtoul(argv[5], 0, 0);
286                                         varset.hsync_len = strtoul(argv[6], 0, 0);
287                                         varset.vsync_len = strtoul(argv[7], 0, 0);
288                                         break;
289 #ifdef BB_FEATURE_FBSET_FANCY
290                                 case CMD_XRES:
291                                         varset.xres = strtoul(argv[1], 0, 0);
292                                         break;
293                                 case CMD_YRES:
294                                         varset.yres = strtoul(argv[1], 0, 0);
295                                         break;
296 #endif
297                                 }
298                                 argc -= g_cmdoptions[i].param_count;
299                                 argv += g_cmdoptions[i].param_count;
300                                 break;
301                         }
302                 }
303                 if (!g_cmdoptions[i].name) {
304                         if (argc == 1) {
305                                 mode = *argv;
306                                 g_options |= OPT_READMODE;
307                         } else {
308                                 fbset_usage();
309                         }
310                 }
311         }
312
313         if ((fh = open(fbdev, O_RDONLY)) < 0)
314                 PERROR("fbset(open)");
315         if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
316                 PERROR("fbset(ioctl)");
317         if (g_options & OPT_READMODE) {
318                 if (!readmode(&var, modefile, mode)) {
319                         fprintf(stderr, "Unknown video mode `%s'\n", mode);
320                         exit(1);
321                 }
322         }
323
324         setmode(&var, &varset);
325         if (g_options & OPT_CHANGE)
326                 if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
327                         PERROR("fbset(ioctl)");
328         showmode(&var);
329         /* Don't close the file, as exiting will take care of that */
330         /* close(fh); */
331
332         exit (TRUE);
333 }