1 /* vi: set sw=4 ts=4: */
3 * Mini fbset implementation for busybox
5 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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.
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.
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
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)
34 #include <sys/ioctl.h>
36 #define PERROR(ctx) do { perror(ctx); exit(1); } while(0)
38 #define DEFAULTFBDEV "/dev/fb0"
39 #define DEFAULTFBMODE "/etc/fb.modes"
42 #define OPT_INFO (1 << 1)
43 #define OPT_READMODE (1 << 2)
48 #define CMD_GEOMETRY 3
55 /* #define CMD_XCOMPAT 10 */
60 #ifdef BB_FEATURE_FBSET_FANCY
67 #define CMD_PIXCLOCK 106
76 #define CMD_EXTSYNC 115
83 static unsigned int g_options = 0;
85 /* Stuff stolen from the kernel's fb.h */
86 #define FBIOGET_VSCREENINFO 0x4600
87 #define FBIOPUT_VSCREENINFO 0x4601
88 #define __u32 unsigned int
90 __u32 offset; /* beginning of bitfield */
91 __u32 length; /* length of bitfield */
92 __u32 msb_right; /* != 0 : Most significant bit is */
95 struct fb_var_screeninfo {
96 __u32 xres; /* visible resolution */
98 __u32 xres_virtual; /* virtual resolution */
100 __u32 xoffset; /* offset from virtual to visible */
101 __u32 yoffset; /* resolution */
103 __u32 bits_per_pixel; /* guess what */
104 __u32 grayscale; /* != 0 Graylevels instead of colors */
106 struct fb_bitfield red; /* bitfield in fb mem if true color, */
107 struct fb_bitfield green; /* else only length is significant */
108 struct fb_bitfield blue;
109 struct fb_bitfield transp; /* transparency */
111 __u32 nonstd; /* != 0 Non standard pixel format */
113 __u32 activate; /* see FB_ACTIVATE_* */
115 __u32 height; /* height of picture in mm */
116 __u32 width; /* width of picture in mm */
118 __u32 accel_flags; /* acceleration flags (hints) */
120 /* Timing: All values in pixclocks, except pixclock (of course) */
121 __u32 pixclock; /* pixel clock in ps (pico seconds) */
122 __u32 left_margin; /* time from sync to picture */
123 __u32 right_margin; /* time from picture to sync */
124 __u32 upper_margin; /* time from sync to picture */
126 __u32 hsync_len; /* length of horizontal sync */
127 __u32 vsync_len; /* length of vertical sync */
128 __u32 sync; /* see FB_SYNC_* */
129 __u32 vmode; /* see FB_VMODE_* */
130 __u32 reserved[6]; /* Reserved for future compatibility */
134 struct cmdoptions_t {
136 unsigned char param_count;
140 "-h", 0, CMD_HELP}, {
144 "-i", 0, CMD_INFO}, {
145 "-g", 5, CMD_GEOMETRY}, {
146 "-t", 7, CMD_TIMING}, {
147 "-accel", 1, CMD_ACCEL}, {
148 "-hsync", 1, CMD_HSYNC}, {
149 "-vsync", 1, CMD_VSYNC}, {
150 "-laced", 1, CMD_LACED}, {
151 "-double", 1, CMD_DOUBLE}, {
152 "-help", 0, CMD_HELP}, {
153 "-n", 0, CMD_CHANGE}, {
154 #ifdef BB_FEATURE_FBSET_FANCY
155 "-help", 0, CMD_HELP}, {
156 "-all", 0, CMD_ALL}, {
157 "-xres", 1, CMD_XRES}, {
158 "-yres", 1, CMD_YRES}, {
159 "-vxres", 1, CMD_VXRES}, {
160 "-vyres", 1, CMD_VYRES}, {
161 "-depth", 1, CMD_DEPTH}, {
162 "-match", 0, CMD_MATCH}, {
163 "-geometry", 5, CMD_GEOMETRY}, {
164 "-pixclock", 1, CMD_PIXCLOCK}, {
165 "-left", 1, CMD_LEFT}, {
166 "-right", 1, CMD_RIGHT}, {
167 "-upper", 1, CMD_UPPER}, {
168 "-lower", 1, CMD_LOWER}, {
169 "-hslen", 1, CMD_HSLEN}, {
170 "-vslen", 1, CMD_VSLEN}, {
171 "-timings", 7, CMD_TIMING}, {
172 "-csync", 1, CMD_CSYNC}, {
173 "-gsync", 1, CMD_GSYNC}, {
174 "-extsync", 1, CMD_EXTSYNC}, {
175 "-bcast", 1, CMD_BCAST}, {
176 "-rgba", 1, CMD_RGBA}, {
177 "-step", 1, CMD_STEP}, {
178 "-move", 1, CMD_MOVE}, {
183 #ifdef BB_FEATURE_FBSET_READMODE
184 /* taken from linux/fb.h */
185 #define FB_VMODE_INTERLACED 1 /* interlaced */
186 #define FB_VMODE_DOUBLE 2 /* double scan */
187 #define FB_SYNC_HOR_HIGH_ACT 1 /* horizontal sync high active */
188 #define FB_SYNC_VERT_HIGH_ACT 2 /* vertical sync high active */
189 #define FB_SYNC_EXT 4 /* external sync */
190 #define FB_SYNC_COMP_HIGH_ACT 8 /* composite sync high active */
192 static int readmode(struct fb_var_screeninfo *base, const char *fn,
195 #ifdef BB_FEATURE_FBSET_READMODE
200 if ((f = fopen(fn, "r")) == NULL)
201 PERROR("readmode(fopen)");
203 fgets(buf, sizeof(buf), f);
204 if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
206 if ((p = strstr(buf, mode))) {
208 if (!isspace(*p) && (*p != 0) && (*p != '"')
209 && (*p != '\r') && (*p != '\n'))
210 continue; /* almost, but not quite */
212 fgets(buf, sizeof(buf), f);
214 if ((p = strstr(buf, "geometry "))) {
217 sscanf(p, "%d %d %d %d %d",
218 &(base->xres), &(base->yres),
219 &(base->xres_virtual), &(base->yres_virtual),
220 &(base->bits_per_pixel));
221 } else if ((p = strstr(buf, "timings "))) {
224 sscanf(p, "%d %d %d %d %d %d %d",
226 &(base->left_margin), &(base->right_margin),
227 &(base->upper_margin), &(base->lower_margin),
228 &(base->hsync_len), &(base->vsync_len));
229 } else if ((p = strstr(buf, "laced "))) {
232 if (strstr(buf, "false")) {
233 base->vmode &= ~FB_VMODE_INTERLACED;
235 base->vmode |= FB_VMODE_INTERLACED;
237 } else if ((p = strstr(buf, "double "))) {
240 if (strstr(buf, "false")) {
241 base->vmode &= ~FB_VMODE_DOUBLE;
243 base->vmode |= FB_VMODE_DOUBLE;
245 } else if ((p = strstr(buf, "vsync "))) {
248 if (strstr(buf, "low")) {
249 base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
251 base->sync |= FB_SYNC_VERT_HIGH_ACT;
253 } else if ((p = strstr(buf, "hsync "))) {
256 if (strstr(buf, "low")) {
257 base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
259 base->sync |= FB_SYNC_HOR_HIGH_ACT;
261 } else if ((p = strstr(buf, "csync "))) {
264 if (strstr(buf, "low")) {
265 base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
267 base->sync |= FB_SYNC_COMP_HIGH_ACT;
269 } else if ((p = strstr(buf, "extsync "))) {
272 if (strstr(buf, "false")) {
273 base->sync &= ~FB_SYNC_EXT;
275 base->sync |= FB_SYNC_EXT;
279 if (strstr(buf, "endmode"))
286 error_msg( "mode reading not compiled in\n");
291 static void setmode(struct fb_var_screeninfo *base,
292 struct fb_var_screeninfo *set)
294 if ((int) set->xres > 0)
295 base->xres = set->xres;
296 if ((int) set->yres > 0)
297 base->yres = set->yres;
298 if ((int) set->xres_virtual > 0)
299 base->xres_virtual = set->xres_virtual;
300 if ((int) set->yres_virtual > 0)
301 base->yres_virtual = set->yres_virtual;
302 if ((int) set->bits_per_pixel > 0)
303 base->bits_per_pixel = set->bits_per_pixel;
306 static void showmode(struct fb_var_screeninfo *v)
308 double drate = 0, hrate = 0, vrate = 0;
311 drate = 1e12 / v->pixclock;
313 drate / (v->left_margin + v->xres + v->right_margin +
316 hrate / (v->upper_margin + v->yres + v->lower_margin +
319 printf("\nmode \"%ux%u-%u\"\n", v->xres, v->yres, (int) (vrate + 0.5));
320 #ifdef BB_FEATURE_FBSET_FANCY
321 printf("\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n", drate / 1e6,
324 printf("\tgeometry %u %u %u %u %u\n", v->xres, v->yres,
325 v->xres_virtual, v->yres_virtual, v->bits_per_pixel);
326 printf("\ttimings %u %u %u %u %u %u %u\n", v->pixclock, v->left_margin,
327 v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
329 printf("\taccel %s\n", (v->accel_flags > 0 ? "true" : "false"));
330 printf("\trgba %u/%u,%u/%u,%u/%u,%u/%u\n", v->red.length,
331 v->red.offset, v->green.length, v->green.offset, v->blue.length,
332 v->blue.offset, v->transp.length, v->transp.offset);
333 printf("endmode\n\n");
336 static void fbset_usage(void)
338 #ifndef BB_FEATURE_TRIVIAL_HELP
343 fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n",
346 fprintf(stderr, "Usage: fbset [options] [mode]\n");
347 #ifndef BB_FEATURE_TRIVIAL_HELP
348 fprintf(stderr, "\nShows and modifies frame buffer device settings\n\n");
349 fprintf(stderr, "The following options are recognized:\n");
350 for (i = 0; g_cmdoptions[i].name; i++)
351 fprintf(stderr, "\t%s\n", g_cmdoptions[i].name);
357 int main(int argc, char **argv)
359 extern int fbset_main(int argc, char **argv)
362 struct fb_var_screeninfo var, varset;
364 char *fbdev = DEFAULTFBDEV;
365 char *modefile = DEFAULTFBMODE;
366 char *thisarg, *mode = NULL;
368 memset(&varset, 0xFF, sizeof(varset));
370 /* parse cmd args.... why do they have to make things so difficult? */
373 for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
374 for (i = 0; g_cmdoptions[i].name; i++) {
375 if (!strcmp(thisarg, g_cmdoptions[i].name)) {
376 if (argc - 1 < g_cmdoptions[i].param_count)
378 switch (g_cmdoptions[i].code) {
388 varset.xres = strtoul(argv[1], 0, 0);
389 varset.yres = strtoul(argv[2], 0, 0);
390 varset.xres_virtual = strtoul(argv[3], 0, 0);
391 varset.yres_virtual = strtoul(argv[4], 0, 0);
392 varset.bits_per_pixel = strtoul(argv[5], 0, 0);
395 varset.pixclock = strtoul(argv[1], 0, 0);
396 varset.left_margin = strtoul(argv[2], 0, 0);
397 varset.right_margin = strtoul(argv[3], 0, 0);
398 varset.upper_margin = strtoul(argv[4], 0, 0);
399 varset.lower_margin = strtoul(argv[5], 0, 0);
400 varset.hsync_len = strtoul(argv[6], 0, 0);
401 varset.vsync_len = strtoul(argv[7], 0, 0);
404 g_options |= OPT_CHANGE;
406 #ifdef BB_FEATURE_FBSET_FANCY
408 varset.xres = strtoul(argv[1], 0, 0);
411 varset.yres = strtoul(argv[1], 0, 0);
415 argc -= g_cmdoptions[i].param_count;
416 argv += g_cmdoptions[i].param_count;
420 if (!g_cmdoptions[i].name) {
423 g_options |= OPT_READMODE;
430 if ((fh = open(fbdev, O_RDONLY)) < 0)
431 PERROR("fbset(open)");
432 if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
433 PERROR("fbset(ioctl)");
434 if (g_options & OPT_READMODE) {
435 if (!readmode(&var, modefile, mode)) {
436 error_msg("Unknown video mode `%s'\n", mode);
441 setmode(&var, &varset);
442 if (g_options & OPT_CHANGE)
443 if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
444 PERROR("fbset(ioctl)");
446 /* Don't close the file, as exiting will take care of that */