source: MondoRescue/branches/3.3/mindi-busybox/util-linux/fbset.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
File size: 15.4 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 source tree.
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//usage:#define fbset_trivial_usage
16//usage: "[OPTIONS] [MODE]"
17//usage:#define fbset_full_usage "\n\n"
18//usage: "Show and modify frame buffer settings"
19//usage:
20//usage:#define fbset_example_usage
21//usage: "$ fbset\n"
22//usage: "mode \"1024x768-76\"\n"
23//usage: " # D: 78.653 MHz, H: 59.949 kHz, V: 75.694 Hz\n"
24//usage: " geometry 1024 768 1024 768 16\n"
25//usage: " timings 12714 128 32 16 4 128 4\n"
26//usage: " accel false\n"
27//usage: " rgba 5/11,6/5,5/0,0/0\n"
28//usage: "endmode\n"
29
30#include "libbb.h"
31
32#define DEFAULTFBDEV FB_0
33#define DEFAULTFBMODE "/etc/fb.modes"
34
35/* Stuff stolen from the kernel's fb.h */
36#define FB_ACTIVATE_ALL 64
37enum {
38 FBIOGET_VSCREENINFO = 0x4600,
39 FBIOPUT_VSCREENINFO = 0x4601
40};
41
42struct fb_bitfield {
43 uint32_t offset; /* beginning of bitfield */
44 uint32_t length; /* length of bitfield */
45 uint32_t msb_right; /* !=0: Most significant bit is right */
46};
47struct fb_var_screeninfo {
48 uint32_t xres; /* visible resolution */
49 uint32_t yres;
50 uint32_t xres_virtual; /* virtual resolution */
51 uint32_t yres_virtual;
52 uint32_t xoffset; /* offset from virtual to visible */
53 uint32_t yoffset; /* resolution */
54
55 uint32_t bits_per_pixel;
56 uint32_t grayscale; /* !=0 Graylevels instead of colors */
57
58 struct fb_bitfield red; /* bitfield in fb mem if true color, */
59 struct fb_bitfield green; /* else only length is significant */
60 struct fb_bitfield blue;
61 struct fb_bitfield transp; /* transparency */
62
63 uint32_t nonstd; /* !=0 Non standard pixel format */
64
65 uint32_t activate; /* see FB_ACTIVATE_x */
66
67 uint32_t height; /* height of picture in mm */
68 uint32_t width; /* width of picture in mm */
69
70 uint32_t accel_flags; /* acceleration flags (hints) */
71
72 /* Timing: All values in pixclocks, except pixclock (of course) */
73 uint32_t pixclock; /* pixel clock in ps (pico seconds) */
74 uint32_t left_margin; /* time from sync to picture */
75 uint32_t right_margin; /* time from picture to sync */
76 uint32_t upper_margin; /* time from sync to picture */
77 uint32_t lower_margin;
78 uint32_t hsync_len; /* length of horizontal sync */
79 uint32_t vsync_len; /* length of vertical sync */
80 uint32_t sync; /* see FB_SYNC_x */
81 uint32_t vmode; /* see FB_VMODE_x */
82 uint32_t reserved[6]; /* Reserved for future compatibility */
83};
84
85static void copy_if_gt0(uint32_t *src, uint32_t *dst, unsigned cnt)
86{
87 do {
88 if ((int32_t) *src > 0)
89 *dst = *src;
90 src++;
91 dst++;
92 } while (--cnt);
93}
94
95static NOINLINE void copy_changed_values(
96 struct fb_var_screeninfo *base,
97 struct fb_var_screeninfo *set)
98{
99 //if ((int32_t) set->xres > 0) base->xres = set->xres;
100 //if ((int32_t) set->yres > 0) base->yres = set->yres;
101 //if ((int32_t) set->xres_virtual > 0) base->xres_virtual = set->xres_virtual;
102 //if ((int32_t) set->yres_virtual > 0) base->yres_virtual = set->yres_virtual;
103 copy_if_gt0(&set->xres, &base->xres, 4);
104
105 if ((int32_t) set->bits_per_pixel > 0) base->bits_per_pixel = set->bits_per_pixel;
106 //copy_if_gt0(&set->bits_per_pixel, &base->bits_per_pixel, 1);
107
108 //if ((int32_t) set->pixclock > 0) base->pixclock = set->pixclock;
109 //if ((int32_t) set->left_margin > 0) base->left_margin = set->left_margin;
110 //if ((int32_t) set->right_margin > 0) base->right_margin = set->right_margin;
111 //if ((int32_t) set->upper_margin > 0) base->upper_margin = set->upper_margin;
112 //if ((int32_t) set->lower_margin > 0) base->lower_margin = set->lower_margin;
113 //if ((int32_t) set->hsync_len > 0) base->hsync_len = set->hsync_len;
114 //if ((int32_t) set->vsync_len > 0) base->vsync_len = set->vsync_len;
115 //if ((int32_t) set->sync > 0) base->sync = set->sync;
116 //if ((int32_t) set->vmode > 0) base->vmode = set->vmode;
117 copy_if_gt0(&set->pixclock, &base->pixclock, 9);
118}
119
120
121enum {
122 CMD_FB = 1,
123 CMD_DB = 2,
124 CMD_GEOMETRY = 3,
125 CMD_TIMING = 4,
126 CMD_ACCEL = 5,
127 CMD_HSYNC = 6,
128 CMD_VSYNC = 7,
129 CMD_LACED = 8,
130 CMD_DOUBLE = 9,
131/* CMD_XCOMPAT = 10, */
132 CMD_ALL = 11,
133 CMD_INFO = 12,
134 CMD_SHOW = 13,
135 CMD_CHANGE = 14,
136
137#if ENABLE_FEATURE_FBSET_FANCY
138 CMD_XRES = 100,
139 CMD_YRES = 101,
140 CMD_VXRES = 102,
141 CMD_VYRES = 103,
142 CMD_DEPTH = 104,
143 CMD_MATCH = 105,
144 CMD_PIXCLOCK = 106,
145 CMD_LEFT = 107,
146 CMD_RIGHT = 108,
147 CMD_UPPER = 109,
148 CMD_LOWER = 110,
149 CMD_HSLEN = 111,
150 CMD_VSLEN = 112,
151 CMD_CSYNC = 113,
152 CMD_GSYNC = 114,
153 CMD_EXTSYNC = 115,
154 CMD_BCAST = 116,
155 CMD_RGBA = 117,
156 CMD_STEP = 118,
157 CMD_MOVE = 119,
158#endif
159};
160
161static const struct cmdoptions_t {
162 const char name[9];
163 const unsigned char param_count;
164 const unsigned char code;
165} g_cmdoptions[] = {
166 /*"12345678" + NUL */
167//TODO: convert to index_in_strings()
168 { "fb" , 1, CMD_FB },
169 { "db" , 1, CMD_DB },
170 { "a" , 0, CMD_ALL },
171 { "i" , 0, CMD_INFO },
172 { "g" , 5, CMD_GEOMETRY },
173 { "t" , 7, CMD_TIMING },
174 { "accel" , 1, CMD_ACCEL },
175 { "hsync" , 1, CMD_HSYNC },
176 { "vsync" , 1, CMD_VSYNC },
177 { "laced" , 1, CMD_LACED },
178 { "double" , 1, CMD_DOUBLE },
179 { "show" , 0, CMD_SHOW },
180 { "s" , 0, CMD_SHOW },
181#if ENABLE_FEATURE_FBSET_FANCY
182 { "all" , 0, CMD_ALL },
183 { "xres" , 1, CMD_XRES },
184 { "yres" , 1, CMD_YRES },
185 { "vxres" , 1, CMD_VXRES },
186 { "vyres" , 1, CMD_VYRES },
187 { "depth" , 1, CMD_DEPTH },
188 { "match" , 0, CMD_MATCH },
189 { "geometry", 5, CMD_GEOMETRY },
190 { "pixclock", 1, CMD_PIXCLOCK },
191 { "left" , 1, CMD_LEFT },
192 { "right" , 1, CMD_RIGHT },
193 { "upper" , 1, CMD_UPPER },
194 { "lower" , 1, CMD_LOWER },
195 { "hslen" , 1, CMD_HSLEN },
196 { "vslen" , 1, CMD_VSLEN },
197 { "timings" , 7, CMD_TIMING },
198 { "csync" , 1, CMD_CSYNC },
199 { "gsync" , 1, CMD_GSYNC },
200 { "extsync" , 1, CMD_EXTSYNC },
201 { "bcast" , 1, CMD_BCAST },
202 { "rgba" , 1, CMD_RGBA },
203 { "step" , 1, CMD_STEP },
204 { "move" , 1, CMD_MOVE },
205#endif
206};
207
208/* taken from linux/fb.h */
209enum {
210 FB_SYNC_HOR_HIGH_ACT = 1, /* horizontal sync high active */
211 FB_SYNC_VERT_HIGH_ACT = 2, /* vertical sync high active */
212#if ENABLE_FEATURE_FBSET_READMODE
213 FB_VMODE_INTERLACED = 1, /* interlaced */
214 FB_VMODE_DOUBLE = 2, /* double scan */
215 FB_SYNC_EXT = 4, /* external sync */
216 FB_SYNC_COMP_HIGH_ACT = 8, /* composite sync high active */
217#endif
218};
219
220#if ENABLE_FEATURE_FBSET_READMODE
221static void ss(uint32_t *x, uint32_t flag, char *buf, const char *what)
222{
223 if (strcmp(buf, what) == 0)
224 *x &= ~flag;
225 else
226 *x |= flag;
227}
228
229/* Mode db file contains mode definitions like this:
230 * mode "800x600-48-lace"
231 * # D: 36.00 MHz, H: 33.835 kHz, V: 96.39 Hz
232 * geometry 800 600 800 600 8
233 * timings 27778 56 80 79 11 128 12
234 * laced true
235 * hsync high
236 * vsync high
237 * endmode
238 */
239static int read_mode_db(struct fb_var_screeninfo *base, const char *fn,
240 const char *mode)
241{
242 char *token[2], *p, *s;
243 parser_t *parser = config_open(fn);
244
245 while (config_read(parser, token, 2, 1, "# \t\r", PARSE_NORMAL)) {
246 if (strcmp(token[0], "mode") != 0 || !token[1])
247 continue;
248 p = strstr(token[1], mode);
249 if (!p)
250 continue;
251 s = p + strlen(mode);
252 //bb_error_msg("CHECK[%s][%s][%d]", mode, p-1, *s);
253 /* exact match? */
254 if (((!*s || isspace(*s)) && '"' != s[-1]) /* end-of-token */
255 || ('"' == *s && '"' == p[-1]) /* ends with " but starts with " too! */
256 ) {
257 //bb_error_msg("FOUND[%s][%s][%s][%d]", token[1], p, mode, isspace(*s));
258 break;
259 }
260 }
261
262 if (!token[0])
263 return 0;
264
265 while (config_read(parser, token, 2, 1, "# \t", PARSE_NORMAL)) {
266 int i;
267
268//bb_error_msg("???[%s][%s]", token[0], token[1]);
269 if (strcmp(token[0], "endmode") == 0) {
270//bb_error_msg("OK[%s]", mode);
271 return 1;
272 }
273 p = token[1];
274 i = index_in_strings(
275 "geometry\0timings\0interlaced\0double\0vsync\0hsync\0csync\0extsync\0rgba\0",
276 token[0]);
277 switch (i) {
278 case 0:
279 if (sizeof(int) == sizeof(base->xres)) {
280 sscanf(p, "%d %d %d %d %d",
281 &base->xres, &base->yres,
282 &base->xres_virtual, &base->yres_virtual,
283 &base->bits_per_pixel);
284 } else {
285 int base_xres, base_yres;
286 int base_xres_virtual, base_yres_virtual;
287 int base_bits_per_pixel;
288 sscanf(p, "%d %d %d %d %d",
289 &base_xres, &base_yres,
290 &base_xres_virtual, &base_yres_virtual,
291 &base_bits_per_pixel);
292 base->xres = base_xres;
293 base->yres = base_yres;
294 base->xres_virtual = base_xres_virtual;
295 base->yres_virtual = base_yres_virtual;
296 base->bits_per_pixel = base_bits_per_pixel;
297 }
298//bb_error_msg("GEO[%s]", p);
299 break;
300 case 1:
301 if (sizeof(int) == sizeof(base->xres)) {
302 sscanf(p, "%d %d %d %d %d %d %d",
303 &base->pixclock,
304 &base->left_margin, &base->right_margin,
305 &base->upper_margin, &base->lower_margin,
306 &base->hsync_len, &base->vsync_len);
307 } else {
308 int base_pixclock;
309 int base_left_margin, base_right_margin;
310 int base_upper_margin, base_lower_margin;
311 int base_hsync_len, base_vsync_len;
312 sscanf(p, "%d %d %d %d %d %d %d",
313 &base_pixclock,
314 &base_left_margin, &base_right_margin,
315 &base_upper_margin, &base_lower_margin,
316 &base_hsync_len, &base_vsync_len);
317 base->pixclock = base_pixclock;
318 base->left_margin = base_left_margin;
319 base->right_margin = base_right_margin;
320 base->upper_margin = base_upper_margin;
321 base->lower_margin = base_lower_margin;
322 base->hsync_len = base_hsync_len;
323 base->vsync_len = base_vsync_len;
324 }
325//bb_error_msg("TIM[%s]", p);
326 break;
327 case 2:
328 case 3: {
329 static const uint32_t syncs[] = {FB_VMODE_INTERLACED, FB_VMODE_DOUBLE};
330 ss(&base->vmode, syncs[i-2], p, "false");
331//bb_error_msg("VMODE[%s]", p);
332 break;
333 }
334 case 4:
335 case 5:
336 case 6: {
337 static const uint32_t syncs[] = {FB_SYNC_VERT_HIGH_ACT, FB_SYNC_HOR_HIGH_ACT, FB_SYNC_COMP_HIGH_ACT};
338 ss(&base->sync, syncs[i-4], p, "low");
339//bb_error_msg("SYNC[%s]", p);
340 break;
341 }
342 case 7:
343 ss(&base->sync, FB_SYNC_EXT, p, "false");
344//bb_error_msg("EXTSYNC[%s]", p);
345 break;
346 case 8: {
347 int red_offset, red_length;
348 int green_offset, green_length;
349 int blue_offset, blue_length;
350 int transp_offset, transp_length;
351
352 sscanf(p, "%d/%d,%d/%d,%d/%d,%d/%d",
353 &red_length, &red_offset,
354 &green_length, &green_offset,
355 &blue_length, &blue_offset,
356 &transp_length, &transp_offset);
357 base->red.offset = red_offset;
358 base->red.length = red_length;
359 base->red.msb_right = 0;
360 base->green.offset = green_offset;
361 base->green.length = green_length;
362 base->green.msb_right = 0;
363 base->blue.offset = blue_offset;
364 base->blue.length = blue_length;
365 base->blue.msb_right = 0;
366 base->transp.offset = transp_offset;
367 base->transp.length = transp_length;
368 base->transp.msb_right = 0;
369 }
370 }
371 }
372 return 0;
373}
374#endif
375
376static NOINLINE void showmode(struct fb_var_screeninfo *v)
377{
378 double drate = 0, hrate = 0, vrate = 0;
379
380 if (v->pixclock) {
381 drate = 1e12 / v->pixclock;
382 hrate = drate / (v->left_margin + v->xres + v->right_margin + v->hsync_len);
383 vrate = hrate / (v->upper_margin + v->yres + v->lower_margin + v->vsync_len);
384 }
385 printf("\nmode \"%ux%u-%u\"\n"
386#if ENABLE_FEATURE_FBSET_FANCY
387 "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
388#endif
389 "\tgeometry %u %u %u %u %u\n"
390 "\ttimings %u %u %u %u %u %u %u\n"
391 "\taccel %s\n"
392 "\trgba %u/%u,%u/%u,%u/%u,%u/%u\n"
393 "endmode\n\n",
394 v->xres, v->yres, (int) (vrate + 0.5),
395#if ENABLE_FEATURE_FBSET_FANCY
396 drate / 1e6, hrate / 1e3, vrate,
397#endif
398 v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel,
399 v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin,
400 v->hsync_len, v->vsync_len,
401 (v->accel_flags > 0 ? "true" : "false"),
402 v->red.length, v->red.offset, v->green.length, v->green.offset,
403 v->blue.length, v->blue.offset, v->transp.length, v->transp.offset);
404}
405
406int fbset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
407int fbset_main(int argc, char **argv)
408{
409 enum {
410 OPT_CHANGE = (1 << 0),
411 OPT_SHOW = (1 << 1),
412 OPT_READMODE = (1 << 2),
413 OPT_ALL = (1 << 3),
414 };
415 struct fb_var_screeninfo var_old, var_set;
416 int fh, i;
417 unsigned options = 0;
418
419 const char *fbdev = DEFAULTFBDEV;
420 IF_FEATURE_FBSET_READMODE(const char *modefile = DEFAULTFBMODE;)
421 char *thisarg;
422 char *mode = mode; /* for compiler */
423
424 memset(&var_set, 0xff, sizeof(var_set)); /* set all to -1 */
425
426 /* parse cmd args.... why do they have to make things so difficult? */
427 argv++;
428 argc--;
429 for (; argc > 0 && (thisarg = *argv) != NULL; argc--, argv++) {
430 if (thisarg[0] != '-') {
431 if (!ENABLE_FEATURE_FBSET_READMODE || argc != 1)
432 bb_show_usage();
433 mode = thisarg;
434 options |= OPT_READMODE;
435 goto contin;
436 }
437 for (i = 0; i < ARRAY_SIZE(g_cmdoptions); i++) {
438 if (strcmp(thisarg + 1, g_cmdoptions[i].name) != 0)
439 continue;
440 if (argc <= g_cmdoptions[i].param_count)
441 bb_show_usage();
442
443 switch (g_cmdoptions[i].code) {
444 case CMD_FB:
445 fbdev = argv[1];
446 break;
447 case CMD_DB:
448 IF_FEATURE_FBSET_READMODE(modefile = argv[1];)
449 break;
450 case CMD_ALL:
451 options |= OPT_ALL;
452 break;
453 case CMD_SHOW:
454 options |= OPT_SHOW;
455 break;
456 case CMD_GEOMETRY:
457 var_set.xres = xatou32(argv[1]);
458 var_set.yres = xatou32(argv[2]);
459 var_set.xres_virtual = xatou32(argv[3]);
460 var_set.yres_virtual = xatou32(argv[4]);
461 var_set.bits_per_pixel = xatou32(argv[5]);
462 break;
463 case CMD_TIMING:
464 var_set.pixclock = xatou32(argv[1]);
465 var_set.left_margin = xatou32(argv[2]);
466 var_set.right_margin = xatou32(argv[3]);
467 var_set.upper_margin = xatou32(argv[4]);
468 var_set.lower_margin = xatou32(argv[5]);
469 var_set.hsync_len = xatou32(argv[6]);
470 var_set.vsync_len = xatou32(argv[7]);
471 break;
472 case CMD_ACCEL:
473 break;
474 case CMD_HSYNC:
475 var_set.sync |= FB_SYNC_HOR_HIGH_ACT;
476 break;
477 case CMD_VSYNC:
478 var_set.sync |= FB_SYNC_VERT_HIGH_ACT;
479 break;
480#if ENABLE_FEATURE_FBSET_FANCY
481 case CMD_XRES:
482 var_set.xres = xatou32(argv[1]);
483 break;
484 case CMD_YRES:
485 var_set.yres = xatou32(argv[1]);
486 break;
487 case CMD_DEPTH:
488 var_set.bits_per_pixel = xatou32(argv[1]);
489 break;
490#endif
491 }
492 switch (g_cmdoptions[i].code) {
493 case CMD_FB:
494 case CMD_DB:
495 case CMD_ALL:
496 case CMD_SHOW:
497 break;
498 default:
499 /* other commands imply changes */
500 options |= OPT_CHANGE;
501 }
502 argc -= g_cmdoptions[i].param_count;
503 argv += g_cmdoptions[i].param_count;
504 goto contin;
505 }
506 bb_show_usage();
507 contin: ;
508 }
509
510 fh = xopen(fbdev, O_RDONLY);
511 xioctl(fh, FBIOGET_VSCREENINFO, &var_old);
512
513 if (options & OPT_READMODE) {
514#if ENABLE_FEATURE_FBSET_READMODE
515 if (!read_mode_db(&var_old, modefile, mode)) {
516 bb_error_msg_and_die("unknown video mode '%s'", mode);
517 }
518 options |= OPT_CHANGE;
519#endif
520 }
521
522 if (options & OPT_CHANGE) {
523 copy_changed_values(&var_old, &var_set);
524 if (options & OPT_ALL)
525 var_old.activate = FB_ACTIVATE_ALL;
526 xioctl(fh, FBIOPUT_VSCREENINFO, &var_old);
527 }
528
529 if (options == 0 || (options & OPT_SHOW))
530 showmode(&var_old);
531
532 if (ENABLE_FEATURE_CLEAN_UP)
533 close(fh);
534
535 return EXIT_SUCCESS;
536}
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