source: MondoRescue/branches/2.2.5/mindi-busybox/util-linux/fbset.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
File size: 10.9 KB
Line 
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 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 *
9 * This is a from-scratch implementation of fbset; but the de facto fbset
10 * implementation was a good reference. fbset (original) is released under
11 * the GPL, and is (c) 1995-1999 by:
12 * Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
13 */
14
15#include "libbb.h"
16
17#define DEFAULTFBDEV FB_0
18#define DEFAULTFBMODE "/etc/fb.modes"
19
20enum {
21 OPT_CHANGE = (1 << 0),
22 OPT_INFO = (1 << 1),
23 OPT_READMODE = (1 << 2),
24 OPT_ALL = (1 << 9),
25
26 CMD_FB = 1,
27 CMD_DB = 2,
28 CMD_GEOMETRY = 3,
29 CMD_TIMING = 4,
30 CMD_ACCEL = 5,
31 CMD_HSYNC = 6,
32 CMD_VSYNC = 7,
33 CMD_LACED = 8,
34 CMD_DOUBLE = 9,
35/* CMD_XCOMPAT = 10, */
36 CMD_ALL = 11,
37 CMD_INFO = 12,
38 CMD_CHANGE = 13,
39
40#if ENABLE_FEATURE_FBSET_FANCY
41 CMD_XRES = 100,
42 CMD_YRES = 101,
43 CMD_VXRES = 102,
44 CMD_VYRES = 103,
45 CMD_DEPTH = 104,
46 CMD_MATCH = 105,
47 CMD_PIXCLOCK = 106,
48 CMD_LEFT = 107,
49 CMD_RIGHT = 108,
50 CMD_UPPER = 109,
51 CMD_LOWER = 110,
52 CMD_HSLEN = 111,
53 CMD_VSLEN = 112,
54 CMD_CSYNC = 113,
55 CMD_GSYNC = 114,
56 CMD_EXTSYNC = 115,
57 CMD_BCAST = 116,
58 CMD_RGBA = 117,
59 CMD_STEP = 118,
60 CMD_MOVE = 119,
61#endif
62};
63
64static unsigned g_options;
65
66/* Stuff stolen from the kernel's fb.h */
67#define FB_ACTIVATE_ALL 64
68enum {
69 FBIOGET_VSCREENINFO = 0x4600,
70 FBIOPUT_VSCREENINFO = 0x4601
71};
72struct fb_bitfield {
73 uint32_t offset; /* beginning of bitfield */
74 uint32_t length; /* length of bitfield */
75 uint32_t msb_right; /* !=0: Most significant bit is right */
76};
77struct fb_var_screeninfo {
78 uint32_t xres; /* visible resolution */
79 uint32_t yres;
80 uint32_t xres_virtual; /* virtual resolution */
81 uint32_t yres_virtual;
82 uint32_t xoffset; /* offset from virtual to visible */
83 uint32_t yoffset; /* resolution */
84
85 uint32_t bits_per_pixel;
86 uint32_t grayscale; /* !=0 Graylevels instead of colors */
87
88 struct fb_bitfield red; /* bitfield in fb mem if true color, */
89 struct fb_bitfield green; /* else only length is significant */
90 struct fb_bitfield blue;
91 struct fb_bitfield transp; /* transparency */
92
93 uint32_t nonstd; /* !=0 Non standard pixel format */
94
95 uint32_t activate; /* see FB_ACTIVATE_x */
96
97 uint32_t height; /* height of picture in mm */
98 uint32_t width; /* width of picture in mm */
99
100 uint32_t accel_flags; /* acceleration flags (hints) */
101
102 /* Timing: All values in pixclocks, except pixclock (of course) */
103 uint32_t pixclock; /* pixel clock in ps (pico seconds) */
104 uint32_t left_margin; /* time from sync to picture */
105 uint32_t right_margin; /* time from picture to sync */
106 uint32_t upper_margin; /* time from sync to picture */
107 uint32_t lower_margin;
108 uint32_t hsync_len; /* length of horizontal sync */
109 uint32_t vsync_len; /* length of vertical sync */
110 uint32_t sync; /* see FB_SYNC_x */
111 uint32_t vmode; /* see FB_VMODE_x */
112 uint32_t reserved[6]; /* Reserved for future compatibility */
113};
114
115
116static const struct cmdoptions_t {
117 const char name[10];
118 const unsigned char param_count;
119 const unsigned char code;
120} g_cmdoptions[] = {
121 { "-fb", 1, CMD_FB },
122 { "-db", 1, CMD_DB },
123 { "-a", 0, CMD_ALL },
124 { "-i", 0, CMD_INFO },
125 { "-g", 5, CMD_GEOMETRY },
126 { "-t", 7, CMD_TIMING },
127 { "-accel", 1, CMD_ACCEL },
128 { "-hsync", 1, CMD_HSYNC },
129 { "-vsync", 1, CMD_VSYNC },
130 { "-laced", 1, CMD_LACED },
131 { "-double", 1, CMD_DOUBLE },
132 { "-n", 0, CMD_CHANGE },
133#if ENABLE_FEATURE_FBSET_FANCY
134 { "-all", 0, CMD_ALL },
135 { "-xres", 1, CMD_XRES },
136 { "-yres", 1, CMD_YRES },
137 { "-vxres", 1, CMD_VXRES },
138 { "-vyres", 1, CMD_VYRES },
139 { "-depth", 1, CMD_DEPTH },
140 { "-match", 0, CMD_MATCH },
141 { "-geometry", 5, CMD_GEOMETRY },
142 { "-pixclock", 1, CMD_PIXCLOCK },
143 { "-left", 1, CMD_LEFT },
144 { "-right", 1, CMD_RIGHT },
145 { "-upper", 1, CMD_UPPER },
146 { "-lower", 1, CMD_LOWER },
147 { "-hslen", 1, CMD_HSLEN },
148 { "-vslen", 1, CMD_VSLEN },
149 { "-timings", 7, CMD_TIMING },
150 { "-csync", 1, CMD_CSYNC },
151 { "-gsync", 1, CMD_GSYNC },
152 { "-extsync", 1, CMD_EXTSYNC },
153 { "-bcast", 1, CMD_BCAST },
154 { "-rgba", 1, CMD_RGBA },
155 { "-step", 1, CMD_STEP },
156 { "-move", 1, CMD_MOVE },
157#endif
158 { "", 0, 0 }
159};
160
161#if ENABLE_FEATURE_FBSET_READMODE
162/* taken from linux/fb.h */
163enum {
164 FB_VMODE_INTERLACED = 1, /* interlaced */
165 FB_VMODE_DOUBLE = 2, /* double scan */
166 FB_SYNC_HOR_HIGH_ACT = 1, /* horizontal sync high active */
167 FB_SYNC_VERT_HIGH_ACT = 2, /* vertical sync high active */
168 FB_SYNC_EXT = 4, /* external sync */
169 FB_SYNC_COMP_HIGH_ACT = 8 /* composite sync high active */
170};
171#endif
172
173static int readmode(struct fb_var_screeninfo *base, const char *fn,
174 const char *mode)
175{
176#if ENABLE_FEATURE_FBSET_READMODE
177 FILE *f;
178 char buf[256];
179 char *p = buf;
180
181 f = xfopen(fn, "r");
182 while (!feof(f)) {
183 fgets(buf, sizeof(buf), f);
184 if (!(p = strstr(buf, "mode ")) && !(p = strstr(buf, "mode\t")))
185 continue;
186 p += 5;
187 if (!(p = strstr(buf, mode)))
188 continue;
189 p += strlen(mode);
190 if (!isspace(*p) && (*p != 0) && (*p != '"')
191 && (*p != '\r') && (*p != '\n'))
192 continue; /* almost, but not quite */
193
194 while (!feof(f)) {
195 fgets(buf, sizeof(buf), f);
196 if ((p = strstr(buf, "geometry "))) {
197 p += 9;
198 /* FIXME: catastrophic on arches with 64bit ints */
199 sscanf(p, "%d %d %d %d %d",
200 &(base->xres), &(base->yres),
201 &(base->xres_virtual), &(base->yres_virtual),
202 &(base->bits_per_pixel));
203 } else if ((p = strstr(buf, "timings "))) {
204 p += 8;
205 sscanf(p, "%d %d %d %d %d %d %d",
206 &(base->pixclock),
207 &(base->left_margin), &(base->right_margin),
208 &(base->upper_margin), &(base->lower_margin),
209 &(base->hsync_len), &(base->vsync_len));
210 } else if ((p = strstr(buf, "laced "))) {
211 //p += 6;
212 if (strstr(buf, "false")) {
213 base->vmode &= ~FB_VMODE_INTERLACED;
214 } else {
215 base->vmode |= FB_VMODE_INTERLACED;
216 }
217 } else if ((p = strstr(buf, "double "))) {
218 //p += 7;
219 if (strstr(buf, "false")) {
220 base->vmode &= ~FB_VMODE_DOUBLE;
221 } else {
222 base->vmode |= FB_VMODE_DOUBLE;
223 }
224 } else if ((p = strstr(buf, "vsync "))) {
225 //p += 6;
226 if (strstr(buf, "low")) {
227 base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
228 } else {
229 base->sync |= FB_SYNC_VERT_HIGH_ACT;
230 }
231 } else if ((p = strstr(buf, "hsync "))) {
232 //p += 6;
233 if (strstr(buf, "low")) {
234 base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
235 } else {
236 base->sync |= FB_SYNC_HOR_HIGH_ACT;
237 }
238 } else if ((p = strstr(buf, "csync "))) {
239 //p += 6;
240 if (strstr(buf, "low")) {
241 base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
242 } else {
243 base->sync |= FB_SYNC_COMP_HIGH_ACT;
244 }
245 } else if ((p = strstr(buf, "extsync "))) {
246 //p += 8;
247 if (strstr(buf, "false")) {
248 base->sync &= ~FB_SYNC_EXT;
249 } else {
250 base->sync |= FB_SYNC_EXT;
251 }
252 }
253
254 if (strstr(buf, "endmode"))
255 return 1;
256 }
257 }
258#else
259 bb_error_msg("mode reading not compiled in");
260#endif
261 return 0;
262}
263
264static inline void setmode(struct fb_var_screeninfo *base,
265 struct fb_var_screeninfo *set)
266{
267 if ((int) set->xres > 0)
268 base->xres = set->xres;
269 if ((int) set->yres > 0)
270 base->yres = set->yres;
271 if ((int) set->xres_virtual > 0)
272 base->xres_virtual = set->xres_virtual;
273 if ((int) set->yres_virtual > 0)
274 base->yres_virtual = set->yres_virtual;
275 if ((int) set->bits_per_pixel > 0)
276 base->bits_per_pixel = set->bits_per_pixel;
277}
278
279static inline void showmode(struct fb_var_screeninfo *v)
280{
281 double drate = 0, hrate = 0, vrate = 0;
282
283 if (v->pixclock) {
284 drate = 1e12 / v->pixclock;
285 hrate = drate / (v->left_margin + v->xres + v->right_margin + v->hsync_len);
286 vrate = hrate / (v->upper_margin + v->yres + v->lower_margin + v->vsync_len);
287 }
288 printf("\nmode \"%ux%u-%u\"\n"
289#if ENABLE_FEATURE_FBSET_FANCY
290 "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
291#endif
292 "\tgeometry %u %u %u %u %u\n"
293 "\ttimings %u %u %u %u %u %u %u\n"
294 "\taccel %s\n"
295 "\trgba %u/%u,%u/%u,%u/%u,%u/%u\n"
296 "endmode\n\n",
297 v->xres, v->yres, (int) (vrate + 0.5),
298#if ENABLE_FEATURE_FBSET_FANCY
299 drate / 1e6, hrate / 1e3, vrate,
300#endif
301 v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel,
302 v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin,
303 v->hsync_len, v->vsync_len,
304 (v->accel_flags > 0 ? "true" : "false"),
305 v->red.length, v->red.offset, v->green.length, v->green.offset,
306 v->blue.length, v->blue.offset, v->transp.length, v->transp.offset);
307}
308
309#ifdef STANDALONE
310int main(int argc, char **argv)
311#else
312int fbset_main(int argc, char **argv);
313int fbset_main(int argc, char **argv)
314#endif
315{
316 struct fb_var_screeninfo var, varset;
317 int fh, i;
318 const char *fbdev = DEFAULTFBDEV;
319 const char *modefile = DEFAULTFBMODE;
320 char *thisarg, *mode = NULL;
321
322 memset(&varset, 0xFF, sizeof(varset));
323
324 /* parse cmd args.... why do they have to make things so difficult? */
325 argv++;
326 argc--;
327 for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
328 for (i = 0; g_cmdoptions[i].name[0]; i++) {
329 if (strcmp(thisarg, g_cmdoptions[i].name))
330 continue;
331 if (argc-1 < g_cmdoptions[i].param_count)
332 bb_show_usage();
333
334 switch (g_cmdoptions[i].code) {
335 case CMD_FB:
336 fbdev = argv[1];
337 break;
338 case CMD_DB:
339 modefile = argv[1];
340 break;
341 case CMD_GEOMETRY:
342 varset.xres = xatou32(argv[1]);
343 varset.yres = xatou32(argv[2]);
344 varset.xres_virtual = xatou32(argv[3]);
345 varset.yres_virtual = xatou32(argv[4]);
346 varset.bits_per_pixel = xatou32(argv[5]);
347 break;
348 case CMD_TIMING:
349 varset.pixclock = xatou32(argv[1]);
350 varset.left_margin = xatou32(argv[2]);
351 varset.right_margin = xatou32(argv[3]);
352 varset.upper_margin = xatou32(argv[4]);
353 varset.lower_margin = xatou32(argv[5]);
354 varset.hsync_len = xatou32(argv[6]);
355 varset.vsync_len = xatou32(argv[7]);
356 break;
357 case CMD_ALL:
358 g_options |= OPT_ALL;
359 break;
360 case CMD_CHANGE:
361 g_options |= OPT_CHANGE;
362 break;
363#if ENABLE_FEATURE_FBSET_FANCY
364 case CMD_XRES:
365 varset.xres = xatou32(argv[1]);
366 break;
367 case CMD_YRES:
368 varset.yres = xatou32(argv[1]);
369 break;
370 case CMD_DEPTH:
371 varset.bits_per_pixel = xatou32(argv[1]);
372 break;
373#endif
374 }
375 argc -= g_cmdoptions[i].param_count;
376 argv += g_cmdoptions[i].param_count;
377 break;
378 }
379 if (!g_cmdoptions[i].name[0]) {
380 if (argc != 1)
381 bb_show_usage();
382 mode = *argv;
383 g_options |= OPT_READMODE;
384 }
385 }
386
387 fh = xopen(fbdev, O_RDONLY);
388 xioctl(fh, FBIOGET_VSCREENINFO, &var);
389 if (g_options & OPT_READMODE) {
390 if (!readmode(&var, modefile, mode)) {
391 bb_error_msg_and_die("unknown video mode '%s'", mode);
392 }
393 }
394
395 setmode(&var, &varset);
396 if (g_options & OPT_CHANGE) {
397 if (g_options & OPT_ALL)
398 var.activate = FB_ACTIVATE_ALL;
399 xioctl(fh, FBIOPUT_VSCREENINFO, &var);
400 }
401 showmode(&var);
402 /* Don't close the file, as exiting will take care of that */
403 /* close(fh); */
404
405 return EXIT_SUCCESS;
406}
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