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 DEFAULTFBDEV "/dev/fb0"
37 #define DEFAULTFBMODE "/etc/fb.modes"
40 #define OPT_INFO (1 << 1)
41 #define OPT_READMODE (1 << 2)
46 #define CMD_GEOMETRY 3
53 /* #define CMD_XCOMPAT 10 */
58 #ifdef BB_FEATURE_FBSET_FANCY
65 #define CMD_PIXCLOCK 106
74 #define CMD_EXTSYNC 115
81 static unsigned int g_options = 0;
83 /* Stuff stolen from the kernel's fb.h */
84 #define FBIOGET_VSCREENINFO 0x4600
85 #define FBIOPUT_VSCREENINFO 0x4601
86 #define __u32 unsigned int
88 __u32 offset; /* beginning of bitfield */
89 __u32 length; /* length of bitfield */
90 __u32 msb_right; /* != 0 : Most significant bit is */
93 struct fb_var_screeninfo {
94 __u32 xres; /* visible resolution */
96 __u32 xres_virtual; /* virtual resolution */
98 __u32 xoffset; /* offset from virtual to visible */
99 __u32 yoffset; /* resolution */
101 __u32 bits_per_pixel; /* guess what */
102 __u32 grayscale; /* != 0 Graylevels instead of colors */
104 struct fb_bitfield red; /* bitfield in fb mem if true color, */
105 struct fb_bitfield green; /* else only length is significant */
106 struct fb_bitfield blue;
107 struct fb_bitfield transp; /* transparency */
109 __u32 nonstd; /* != 0 Non standard pixel format */
111 __u32 activate; /* see FB_ACTIVATE_* */
113 __u32 height; /* height of picture in mm */
114 __u32 width; /* width of picture in mm */
116 __u32 accel_flags; /* acceleration flags (hints) */
118 /* Timing: All values in pixclocks, except pixclock (of course) */
119 __u32 pixclock; /* pixel clock in ps (pico seconds) */
120 __u32 left_margin; /* time from sync to picture */
121 __u32 right_margin; /* time from picture to sync */
122 __u32 upper_margin; /* time from sync to picture */
124 __u32 hsync_len; /* length of horizontal sync */
125 __u32 vsync_len; /* length of vertical sync */
126 __u32 sync; /* see FB_SYNC_* */
127 __u32 vmode; /* see FB_VMODE_* */
128 __u32 reserved[6]; /* Reserved for future compatibility */
132 struct cmdoptions_t {
134 unsigned char param_count;
138 "-h", 0, CMD_HELP}, {
142 "-i", 0, CMD_INFO}, {
143 "-g", 5, CMD_GEOMETRY}, {
144 "-t", 7, CMD_TIMING}, {
145 "-accel", 1, CMD_ACCEL}, {
146 "-hsync", 1, CMD_HSYNC}, {
147 "-vsync", 1, CMD_VSYNC}, {
148 "-laced", 1, CMD_LACED}, {
149 "-double", 1, CMD_DOUBLE}, {
150 "-help", 0, CMD_HELP}, {
151 "-n", 0, CMD_CHANGE}, {
152 #ifdef BB_FEATURE_FBSET_FANCY
153 "-help", 0, CMD_HELP}, {
154 "-all", 0, CMD_ALL}, {
155 "-xres", 1, CMD_XRES}, {
156 "-yres", 1, CMD_YRES}, {
157 "-vxres", 1, CMD_VXRES}, {
158 "-vyres", 1, CMD_VYRES}, {
159 "-depth", 1, CMD_DEPTH}, {
160 "-match", 0, CMD_MATCH}, {
161 "-geometry", 5, CMD_GEOMETRY}, {
162 "-pixclock", 1, CMD_PIXCLOCK}, {
163 "-left", 1, CMD_LEFT}, {
164 "-right", 1, CMD_RIGHT}, {
165 "-upper", 1, CMD_UPPER}, {
166 "-lower", 1, CMD_LOWER}, {
167 "-hslen", 1, CMD_HSLEN}, {
168 "-vslen", 1, CMD_VSLEN}, {
169 "-timings", 7, CMD_TIMING}, {
170 "-csync", 1, CMD_CSYNC}, {
171 "-gsync", 1, CMD_GSYNC}, {
172 "-extsync", 1, CMD_EXTSYNC}, {
173 "-bcast", 1, CMD_BCAST}, {
174 "-rgba", 1, CMD_RGBA}, {
175 "-step", 1, CMD_STEP}, {
176 "-move", 1, CMD_MOVE}, {
181 #ifdef BB_FEATURE_FBSET_READMODE
182 /* taken from linux/fb.h */
183 #define FB_VMODE_INTERLACED 1 /* interlaced */
184 #define FB_VMODE_DOUBLE 2 /* double scan */
185 #define FB_SYNC_HOR_HIGH_ACT 1 /* horizontal sync high active */
186 #define FB_SYNC_VERT_HIGH_ACT 2 /* vertical sync high active */
187 #define FB_SYNC_EXT 4 /* external sync */
188 #define FB_SYNC_COMP_HIGH_ACT 8 /* composite sync high active */
190 static int readmode(struct fb_var_screeninfo *base, const char *fn,
193 #ifdef BB_FEATURE_FBSET_READMODE
198 if ((f = fopen(fn, "r")) == NULL)
199 perror_msg_and_die("readmode(fopen)");
201 fgets(buf, sizeof(buf), f);
202 if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
204 if ((p = strstr(buf, mode))) {
206 if (!isspace(*p) && (*p != 0) && (*p != '"')
207 && (*p != '\r') && (*p != '\n'))
208 continue; /* almost, but not quite */
210 fgets(buf, sizeof(buf), f);
212 if ((p = strstr(buf, "geometry "))) {
215 sscanf(p, "%d %d %d %d %d",
216 &(base->xres), &(base->yres),
217 &(base->xres_virtual), &(base->yres_virtual),
218 &(base->bits_per_pixel));
219 } else if ((p = strstr(buf, "timings "))) {
222 sscanf(p, "%d %d %d %d %d %d %d",
224 &(base->left_margin), &(base->right_margin),
225 &(base->upper_margin), &(base->lower_margin),
226 &(base->hsync_len), &(base->vsync_len));
227 } else if ((p = strstr(buf, "laced "))) {
230 if (strstr(buf, "false")) {
231 base->vmode &= ~FB_VMODE_INTERLACED;
233 base->vmode |= FB_VMODE_INTERLACED;
235 } else if ((p = strstr(buf, "double "))) {
238 if (strstr(buf, "false")) {
239 base->vmode &= ~FB_VMODE_DOUBLE;
241 base->vmode |= FB_VMODE_DOUBLE;
243 } else if ((p = strstr(buf, "vsync "))) {
246 if (strstr(buf, "low")) {
247 base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
249 base->sync |= FB_SYNC_VERT_HIGH_ACT;
251 } else if ((p = strstr(buf, "hsync "))) {
254 if (strstr(buf, "low")) {
255 base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
257 base->sync |= FB_SYNC_HOR_HIGH_ACT;
259 } else if ((p = strstr(buf, "csync "))) {
262 if (strstr(buf, "low")) {
263 base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
265 base->sync |= FB_SYNC_COMP_HIGH_ACT;
267 } else if ((p = strstr(buf, "extsync "))) {
270 if (strstr(buf, "false")) {
271 base->sync &= ~FB_SYNC_EXT;
273 base->sync |= FB_SYNC_EXT;
277 if (strstr(buf, "endmode"))
284 error_msg( "mode reading not compiled in\n");
289 static void setmode(struct fb_var_screeninfo *base,
290 struct fb_var_screeninfo *set)
292 if ((int) set->xres > 0)
293 base->xres = set->xres;
294 if ((int) set->yres > 0)
295 base->yres = set->yres;
296 if ((int) set->xres_virtual > 0)
297 base->xres_virtual = set->xres_virtual;
298 if ((int) set->yres_virtual > 0)
299 base->yres_virtual = set->yres_virtual;
300 if ((int) set->bits_per_pixel > 0)
301 base->bits_per_pixel = set->bits_per_pixel;
304 static void showmode(struct fb_var_screeninfo *v)
306 double drate = 0, hrate = 0, vrate = 0;
309 drate = 1e12 / v->pixclock;
311 drate / (v->left_margin + v->xres + v->right_margin +
314 hrate / (v->upper_margin + v->yres + v->lower_margin +
317 printf("\nmode \"%ux%u-%u\"\n", v->xres, v->yres, (int) (vrate + 0.5));
318 #ifdef BB_FEATURE_FBSET_FANCY
319 printf("\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n", drate / 1e6,
322 printf("\tgeometry %u %u %u %u %u\n", v->xres, v->yres,
323 v->xres_virtual, v->yres_virtual, v->bits_per_pixel);
324 printf("\ttimings %u %u %u %u %u %u %u\n", v->pixclock, v->left_margin,
325 v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
327 printf("\taccel %s\n", (v->accel_flags > 0 ? "true" : "false"));
328 printf("\trgba %u/%u,%u/%u,%u/%u,%u/%u\n", v->red.length,
329 v->red.offset, v->green.length, v->green.offset, v->blue.length,
330 v->blue.offset, v->transp.length, v->transp.offset);
331 printf("endmode\n\n");
334 static void fbset_usage(void)
336 #ifndef BB_FEATURE_TRIVIAL_HELP
341 fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n",
344 fprintf(stderr, "Usage: fbset [options] [mode]\n");
345 #ifndef BB_FEATURE_TRIVIAL_HELP
346 fprintf(stderr, "\nShows and modifies frame buffer device settings\n\n");
347 fprintf(stderr, "The following options are recognized:\n");
348 for (i = 0; g_cmdoptions[i].name; i++)
349 fprintf(stderr, "\t%s\n", g_cmdoptions[i].name);
355 int main(int argc, char **argv)
357 extern int fbset_main(int argc, char **argv)
360 struct fb_var_screeninfo var, varset;
362 char *fbdev = DEFAULTFBDEV;
363 char *modefile = DEFAULTFBMODE;
364 char *thisarg, *mode = NULL;
366 memset(&varset, 0xFF, sizeof(varset));
368 /* parse cmd args.... why do they have to make things so difficult? */
371 for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
372 for (i = 0; g_cmdoptions[i].name; i++) {
373 if (!strcmp(thisarg, g_cmdoptions[i].name)) {
374 if (argc - 1 < g_cmdoptions[i].param_count)
376 switch (g_cmdoptions[i].code) {
386 varset.xres = strtoul(argv[1], 0, 0);
387 varset.yres = strtoul(argv[2], 0, 0);
388 varset.xres_virtual = strtoul(argv[3], 0, 0);
389 varset.yres_virtual = strtoul(argv[4], 0, 0);
390 varset.bits_per_pixel = strtoul(argv[5], 0, 0);
393 varset.pixclock = strtoul(argv[1], 0, 0);
394 varset.left_margin = strtoul(argv[2], 0, 0);
395 varset.right_margin = strtoul(argv[3], 0, 0);
396 varset.upper_margin = strtoul(argv[4], 0, 0);
397 varset.lower_margin = strtoul(argv[5], 0, 0);
398 varset.hsync_len = strtoul(argv[6], 0, 0);
399 varset.vsync_len = strtoul(argv[7], 0, 0);
402 g_options |= OPT_CHANGE;
404 #ifdef BB_FEATURE_FBSET_FANCY
406 varset.xres = strtoul(argv[1], 0, 0);
409 varset.yres = strtoul(argv[1], 0, 0);
413 argc -= g_cmdoptions[i].param_count;
414 argv += g_cmdoptions[i].param_count;
418 if (!g_cmdoptions[i].name) {
421 g_options |= OPT_READMODE;
428 if ((fh = open(fbdev, O_RDONLY)) < 0)
429 perror_msg_and_die("fbset(open)");
430 if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
431 perror_msg_and_die("fbset(ioctl)");
432 if (g_options & OPT_READMODE) {
433 if (!readmode(&var, modefile, mode)) {
434 error_msg("Unknown video mode `%s'\n", mode);
439 setmode(&var, &varset);
440 if (g_options & OPT_CHANGE)
441 if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
442 perror_msg_and_die("fbset(ioctl)");
444 /* Don't close the file, as exiting will take care of that */