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62#include "libbb.h"
63
64#define DEFAULTFBDEV FB_0
65#define DEFAULTFBMODE "/etc/fb.modes"
66
67
68#define FB_ACTIVATE_ALL 64
69enum {
70 FBIOGET_VSCREENINFO = 0x4600,
71 FBIOPUT_VSCREENINFO = 0x4601
72};
73
74struct fb_bitfield {
75 uint32_t offset;
76 uint32_t length;
77 uint32_t msb_right;
78};
79struct fb_var_screeninfo {
80 uint32_t xres;
81 uint32_t yres;
82 uint32_t xres_virtual;
83 uint32_t yres_virtual;
84 uint32_t xoffset;
85 uint32_t yoffset;
86
87 uint32_t bits_per_pixel;
88 uint32_t grayscale;
89
90 struct fb_bitfield red;
91 struct fb_bitfield green;
92 struct fb_bitfield blue;
93 struct fb_bitfield transp;
94
95 uint32_t nonstd;
96
97 uint32_t activate;
98
99 uint32_t height;
100 uint32_t width;
101
102 uint32_t accel_flags;
103
104
105 uint32_t pixclock;
106 uint32_t left_margin;
107 uint32_t right_margin;
108 uint32_t upper_margin;
109 uint32_t lower_margin;
110 uint32_t hsync_len;
111 uint32_t vsync_len;
112 uint32_t sync;
113 uint32_t vmode;
114 uint32_t reserved[6];
115};
116
117static void copy_if_gt0(uint32_t *src, uint32_t *dst, unsigned cnt)
118{
119 do {
120 if ((int32_t) *src > 0)
121 *dst = *src;
122 src++;
123 dst++;
124 } while (--cnt);
125}
126
127static NOINLINE void copy_changed_values(
128 struct fb_var_screeninfo *base,
129 struct fb_var_screeninfo *set)
130{
131
132
133
134
135 copy_if_gt0(&set->xres, &base->xres, 4);
136
137 if ((int32_t) set->bits_per_pixel > 0) base->bits_per_pixel = set->bits_per_pixel;
138
139
140
141
142
143
144
145
146
147
148
149 copy_if_gt0(&set->pixclock, &base->pixclock, 9);
150}
151
152
153enum {
154 CMD_FB = 1,
155 CMD_DB = 2,
156 CMD_GEOMETRY = 3,
157 CMD_TIMING = 4,
158 CMD_ACCEL = 5,
159 CMD_HSYNC = 6,
160 CMD_VSYNC = 7,
161 CMD_LACED = 8,
162 CMD_DOUBLE = 9,
163
164 CMD_ALL = 11,
165 CMD_INFO = 12,
166 CMD_SHOW = 13,
167 CMD_CHANGE = 14,
168
169#if ENABLE_FEATURE_FBSET_FANCY
170 CMD_XRES = 100,
171 CMD_YRES = 101,
172 CMD_VXRES = 102,
173 CMD_VYRES = 103,
174 CMD_DEPTH = 104,
175 CMD_MATCH = 105,
176 CMD_PIXCLOCK = 106,
177 CMD_LEFT = 107,
178 CMD_RIGHT = 108,
179 CMD_UPPER = 109,
180 CMD_LOWER = 110,
181 CMD_HSLEN = 111,
182 CMD_VSLEN = 112,
183 CMD_CSYNC = 113,
184 CMD_GSYNC = 114,
185 CMD_EXTSYNC = 115,
186 CMD_BCAST = 116,
187 CMD_RGBA = 117,
188 CMD_STEP = 118,
189 CMD_MOVE = 119,
190#endif
191};
192
193static const struct cmdoptions_t {
194 const char name[9];
195 const unsigned char param_count;
196 const unsigned char code;
197} g_cmdoptions[] = {
198
199
200 { "fb" , 1, CMD_FB },
201 { "db" , 1, CMD_DB },
202 { "a" , 0, CMD_ALL },
203 { "i" , 0, CMD_INFO },
204 { "g" , 5, CMD_GEOMETRY },
205 { "t" , 7, CMD_TIMING },
206 { "accel" , 1, CMD_ACCEL },
207 { "hsync" , 1, CMD_HSYNC },
208 { "vsync" , 1, CMD_VSYNC },
209 { "laced" , 1, CMD_LACED },
210 { "double" , 1, CMD_DOUBLE },
211 { "show" , 0, CMD_SHOW },
212 { "s" , 0, CMD_SHOW },
213#if ENABLE_FEATURE_FBSET_FANCY
214 { "all" , 0, CMD_ALL },
215 { "xres" , 1, CMD_XRES },
216 { "yres" , 1, CMD_YRES },
217 { "vxres" , 1, CMD_VXRES },
218 { "vyres" , 1, CMD_VYRES },
219 { "depth" , 1, CMD_DEPTH },
220 { "match" , 0, CMD_MATCH },
221 { "geometry", 5, CMD_GEOMETRY },
222 { "pixclock", 1, CMD_PIXCLOCK },
223 { "left" , 1, CMD_LEFT },
224 { "right" , 1, CMD_RIGHT },
225 { "upper" , 1, CMD_UPPER },
226 { "lower" , 1, CMD_LOWER },
227 { "hslen" , 1, CMD_HSLEN },
228 { "vslen" , 1, CMD_VSLEN },
229 { "timings" , 7, CMD_TIMING },
230 { "csync" , 1, CMD_CSYNC },
231 { "gsync" , 1, CMD_GSYNC },
232 { "extsync" , 1, CMD_EXTSYNC },
233 { "bcast" , 1, CMD_BCAST },
234 { "rgba" , 1, CMD_RGBA },
235 { "step" , 1, CMD_STEP },
236 { "move" , 1, CMD_MOVE },
237#endif
238};
239
240
241enum {
242 FB_SYNC_HOR_HIGH_ACT = 1,
243 FB_SYNC_VERT_HIGH_ACT = 2,
244#if ENABLE_FEATURE_FBSET_READMODE
245 FB_VMODE_INTERLACED = 1,
246 FB_VMODE_DOUBLE = 2,
247 FB_SYNC_EXT = 4,
248 FB_SYNC_COMP_HIGH_ACT = 8,
249#endif
250};
251
252#if ENABLE_FEATURE_FBSET_READMODE
253static void ss(uint32_t *x, uint32_t flag, char *buf, const char *what)
254{
255 if (strcmp(buf, what) == 0)
256 *x &= ~flag;
257 else
258 *x |= flag;
259}
260
261
262
263
264
265
266
267
268
269
270
271static int read_mode_db(struct fb_var_screeninfo *base, const char *fn,
272 const char *mode)
273{
274 char *token[2], *p, *s;
275 parser_t *parser = config_open(fn);
276
277 while (config_read(parser, token, 2, 1, "# \t\r", PARSE_NORMAL)) {
278 if (strcmp(token[0], "mode") != 0 || !token[1])
279 continue;
280 p = strstr(token[1], mode);
281 if (!p)
282 continue;
283 s = p + strlen(mode);
284
285
286 if (((!*s || isspace(*s)) && '"' != s[-1])
287 || ('"' == *s && '"' == p[-1])
288 ) {
289
290 break;
291 }
292 }
293
294 if (!token[0])
295 return 0;
296
297 while (config_read(parser, token, 2, 1, "# \t", PARSE_NORMAL)) {
298 int i;
299
300
301 if (strcmp(token[0], "endmode") == 0) {
302
303 return 1;
304 }
305 p = token[1];
306 i = index_in_strings(
307 "geometry\0timings\0interlaced\0double\0vsync\0hsync\0csync\0extsync\0rgba\0",
308 token[0]);
309 switch (i) {
310 case 0:
311 if (sizeof(int) == sizeof(base->xres)) {
312 sscanf(p, "%d %d %d %d %d",
313 &base->xres, &base->yres,
314 &base->xres_virtual, &base->yres_virtual,
315 &base->bits_per_pixel);
316 } else {
317 int base_xres, base_yres;
318 int base_xres_virtual, base_yres_virtual;
319 int base_bits_per_pixel;
320 sscanf(p, "%d %d %d %d %d",
321 &base_xres, &base_yres,
322 &base_xres_virtual, &base_yres_virtual,
323 &base_bits_per_pixel);
324 base->xres = base_xres;
325 base->yres = base_yres;
326 base->xres_virtual = base_xres_virtual;
327 base->yres_virtual = base_yres_virtual;
328 base->bits_per_pixel = base_bits_per_pixel;
329 }
330
331 break;
332 case 1:
333 if (sizeof(int) == sizeof(base->xres)) {
334 sscanf(p, "%d %d %d %d %d %d %d",
335 &base->pixclock,
336 &base->left_margin, &base->right_margin,
337 &base->upper_margin, &base->lower_margin,
338 &base->hsync_len, &base->vsync_len);
339 } else {
340 int base_pixclock;
341 int base_left_margin, base_right_margin;
342 int base_upper_margin, base_lower_margin;
343 int base_hsync_len, base_vsync_len;
344 sscanf(p, "%d %d %d %d %d %d %d",
345 &base_pixclock,
346 &base_left_margin, &base_right_margin,
347 &base_upper_margin, &base_lower_margin,
348 &base_hsync_len, &base_vsync_len);
349 base->pixclock = base_pixclock;
350 base->left_margin = base_left_margin;
351 base->right_margin = base_right_margin;
352 base->upper_margin = base_upper_margin;
353 base->lower_margin = base_lower_margin;
354 base->hsync_len = base_hsync_len;
355 base->vsync_len = base_vsync_len;
356 }
357
358 break;
359 case 2:
360 case 3: {
361 static const uint32_t syncs[] = {FB_VMODE_INTERLACED, FB_VMODE_DOUBLE};
362 ss(&base->vmode, syncs[i-2], p, "false");
363
364 break;
365 }
366 case 4:
367 case 5:
368 case 6: {
369 static const uint32_t syncs[] = {FB_SYNC_VERT_HIGH_ACT, FB_SYNC_HOR_HIGH_ACT, FB_SYNC_COMP_HIGH_ACT};
370 ss(&base->sync, syncs[i-4], p, "low");
371
372 break;
373 }
374 case 7:
375 ss(&base->sync, FB_SYNC_EXT, p, "false");
376
377 break;
378 case 8: {
379 int red_offset, red_length;
380 int green_offset, green_length;
381 int blue_offset, blue_length;
382 int transp_offset, transp_length;
383
384 sscanf(p, "%d/%d,%d/%d,%d/%d,%d/%d",
385 &red_length, &red_offset,
386 &green_length, &green_offset,
387 &blue_length, &blue_offset,
388 &transp_length, &transp_offset);
389 base->red.offset = red_offset;
390 base->red.length = red_length;
391 base->red.msb_right = 0;
392 base->green.offset = green_offset;
393 base->green.length = green_length;
394 base->green.msb_right = 0;
395 base->blue.offset = blue_offset;
396 base->blue.length = blue_length;
397 base->blue.msb_right = 0;
398 base->transp.offset = transp_offset;
399 base->transp.length = transp_length;
400 base->transp.msb_right = 0;
401 }
402 }
403 }
404 return 0;
405}
406#endif
407
408static NOINLINE void showmode(struct fb_var_screeninfo *v)
409{
410 double drate = 0, hrate = 0, vrate = 0;
411
412 if (v->pixclock) {
413 drate = 1e12 / v->pixclock;
414 hrate = drate / (v->left_margin + v->xres + v->right_margin + v->hsync_len);
415 vrate = hrate / (v->upper_margin + v->yres + v->lower_margin + v->vsync_len);
416 }
417 printf("\nmode \"%ux%u-%u\"\n"
418#if ENABLE_FEATURE_FBSET_FANCY
419 "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
420#endif
421 "\tgeometry %u %u %u %u %u\n"
422 "\ttimings %u %u %u %u %u %u %u\n"
423 "\taccel %s\n"
424 "\trgba %u/%u,%u/%u,%u/%u,%u/%u\n"
425 "endmode\n\n",
426 v->xres, v->yres, (int) (vrate + 0.5),
427#if ENABLE_FEATURE_FBSET_FANCY
428 drate / 1e6, hrate / 1e3, vrate,
429#endif
430 v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel,
431 v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin,
432 v->hsync_len, v->vsync_len,
433 (v->accel_flags > 0 ? "true" : "false"),
434 v->red.length, v->red.offset, v->green.length, v->green.offset,
435 v->blue.length, v->blue.offset, v->transp.length, v->transp.offset);
436}
437
438int fbset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
439int fbset_main(int argc, char **argv)
440{
441 enum {
442 OPT_CHANGE = (1 << 0),
443 OPT_SHOW = (1 << 1),
444 OPT_READMODE = (1 << 2),
445 OPT_ALL = (1 << 3),
446 };
447 struct fb_var_screeninfo var_old, var_set;
448 int fh, i;
449 unsigned options = 0;
450
451 const char *fbdev = DEFAULTFBDEV;
452 IF_FEATURE_FBSET_READMODE(const char *modefile = DEFAULTFBMODE;)
453 char *thisarg;
454 char *mode = mode;
455
456 memset(&var_set, 0xff, sizeof(var_set));
457
458
459 argv++;
460 argc--;
461 for (; argc > 0 && (thisarg = *argv) != NULL; argc--, argv++) {
462 if (thisarg[0] != '-') {
463 if (!ENABLE_FEATURE_FBSET_READMODE || argc != 1)
464 bb_show_usage();
465 mode = thisarg;
466 options |= OPT_READMODE;
467 goto contin;
468 }
469 for (i = 0; i < ARRAY_SIZE(g_cmdoptions); i++) {
470 if (strcmp(thisarg + 1, g_cmdoptions[i].name) != 0)
471 continue;
472 if (argc <= g_cmdoptions[i].param_count)
473 bb_show_usage();
474
475 switch (g_cmdoptions[i].code) {
476 case CMD_FB:
477 fbdev = argv[1];
478 break;
479 case CMD_DB:
480 IF_FEATURE_FBSET_READMODE(modefile = argv[1];)
481 break;
482 case CMD_ALL:
483 options |= OPT_ALL;
484 break;
485 case CMD_SHOW:
486 options |= OPT_SHOW;
487 break;
488 case CMD_GEOMETRY:
489 var_set.xres = xatou32(argv[1]);
490 var_set.yres = xatou32(argv[2]);
491 var_set.xres_virtual = xatou32(argv[3]);
492 var_set.yres_virtual = xatou32(argv[4]);
493 var_set.bits_per_pixel = xatou32(argv[5]);
494 break;
495 case CMD_TIMING:
496 var_set.pixclock = xatou32(argv[1]);
497 var_set.left_margin = xatou32(argv[2]);
498 var_set.right_margin = xatou32(argv[3]);
499 var_set.upper_margin = xatou32(argv[4]);
500 var_set.lower_margin = xatou32(argv[5]);
501 var_set.hsync_len = xatou32(argv[6]);
502 var_set.vsync_len = xatou32(argv[7]);
503 break;
504 case CMD_ACCEL:
505 break;
506 case CMD_HSYNC:
507 var_set.sync |= FB_SYNC_HOR_HIGH_ACT;
508 break;
509 case CMD_VSYNC:
510 var_set.sync |= FB_SYNC_VERT_HIGH_ACT;
511 break;
512#if ENABLE_FEATURE_FBSET_FANCY
513 case CMD_XRES:
514 var_set.xres = xatou32(argv[1]);
515 break;
516 case CMD_YRES:
517 var_set.yres = xatou32(argv[1]);
518 break;
519 case CMD_DEPTH:
520 var_set.bits_per_pixel = xatou32(argv[1]);
521 break;
522#endif
523 }
524 switch (g_cmdoptions[i].code) {
525 case CMD_FB:
526 case CMD_DB:
527 case CMD_ALL:
528 case CMD_SHOW:
529 break;
530 default:
531
532 options |= OPT_CHANGE;
533 }
534 argc -= g_cmdoptions[i].param_count;
535 argv += g_cmdoptions[i].param_count;
536 goto contin;
537 }
538 bb_show_usage();
539 contin: ;
540 }
541
542 fh = xopen(fbdev, O_RDONLY);
543 xioctl(fh, FBIOGET_VSCREENINFO, &var_old);
544
545 if (options & OPT_READMODE) {
546#if ENABLE_FEATURE_FBSET_READMODE
547 if (!read_mode_db(&var_old, modefile, mode)) {
548 bb_error_msg_and_die("unknown video mode '%s'", mode);
549 }
550 options |= OPT_CHANGE;
551#endif
552 }
553
554 if (options & OPT_CHANGE) {
555 copy_changed_values(&var_old, &var_set);
556 if (options & OPT_ALL)
557 var_old.activate = FB_ACTIVATE_ALL;
558 xioctl(fh, FBIOPUT_VSCREENINFO, &var_old);
559 }
560
561 if (options == 0 || (options & OPT_SHOW))
562 showmode(&var_old);
563
564 if (ENABLE_FEATURE_CLEAN_UP)
565 close(fh);
566
567 return EXIT_SUCCESS;
568}
569
