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30#include "libbb.h"
31
32#define DEFAULTFBDEV FB_0
33#define DEFAULTFBMODE "/etc/fb.modes"
34
35
36#define FB_ACTIVATE_ALL 64
37enum {
38 FBIOGET_VSCREENINFO = 0x4600,
39 FBIOPUT_VSCREENINFO = 0x4601
40};
41
42struct fb_bitfield {
43 uint32_t offset;
44 uint32_t length;
45 uint32_t msb_right;
46};
47struct fb_var_screeninfo {
48 uint32_t xres;
49 uint32_t yres;
50 uint32_t xres_virtual;
51 uint32_t yres_virtual;
52 uint32_t xoffset;
53 uint32_t yoffset;
54
55 uint32_t bits_per_pixel;
56 uint32_t grayscale;
57
58 struct fb_bitfield red;
59 struct fb_bitfield green;
60 struct fb_bitfield blue;
61 struct fb_bitfield transp;
62
63 uint32_t nonstd;
64
65 uint32_t activate;
66
67 uint32_t height;
68 uint32_t width;
69
70 uint32_t accel_flags;
71
72
73 uint32_t pixclock;
74 uint32_t left_margin;
75 uint32_t right_margin;
76 uint32_t upper_margin;
77 uint32_t lower_margin;
78 uint32_t hsync_len;
79 uint32_t vsync_len;
80 uint32_t sync;
81 uint32_t vmode;
82 uint32_t reserved[6];
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
100
101
102
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
107
108
109
110
111
112
113
114
115
116
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
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
167 { "fb" , 1, CMD_FB },
168 { "db" , 1, CMD_DB },
169 { "a" , 0, CMD_ALL },
170 { "i" , 0, CMD_INFO },
171 { "g" , 5, CMD_GEOMETRY },
172 { "t" , 7, CMD_TIMING },
173 { "accel" , 1, CMD_ACCEL },
174 { "hsync" , 1, CMD_HSYNC },
175 { "vsync" , 1, CMD_VSYNC },
176 { "laced" , 1, CMD_LACED },
177 { "double" , 1, CMD_DOUBLE },
178 { "show" , 0, CMD_SHOW },
179 { "s" , 0, CMD_SHOW },
180#if ENABLE_FEATURE_FBSET_FANCY
181 { "all" , 0, CMD_ALL },
182 { "xres" , 1, CMD_XRES },
183 { "yres" , 1, CMD_YRES },
184 { "vxres" , 1, CMD_VXRES },
185 { "vyres" , 1, CMD_VYRES },
186 { "depth" , 1, CMD_DEPTH },
187 { "match" , 0, CMD_MATCH },
188 { "geometry", 5, CMD_GEOMETRY },
189 { "pixclock", 1, CMD_PIXCLOCK },
190 { "left" , 1, CMD_LEFT },
191 { "right" , 1, CMD_RIGHT },
192 { "upper" , 1, CMD_UPPER },
193 { "lower" , 1, CMD_LOWER },
194 { "hslen" , 1, CMD_HSLEN },
195 { "vslen" , 1, CMD_VSLEN },
196 { "timings" , 7, CMD_TIMING },
197 { "csync" , 1, CMD_CSYNC },
198 { "gsync" , 1, CMD_GSYNC },
199 { "extsync" , 1, CMD_EXTSYNC },
200 { "bcast" , 1, CMD_BCAST },
201 { "rgba" , 1, CMD_RGBA },
202 { "step" , 1, CMD_STEP },
203 { "move" , 1, CMD_MOVE },
204#endif
205};
206
207
208enum {
209 FB_SYNC_HOR_HIGH_ACT = 1,
210 FB_SYNC_VERT_HIGH_ACT = 2,
211#if ENABLE_FEATURE_FBSET_READMODE
212 FB_VMODE_INTERLACED = 1,
213 FB_VMODE_DOUBLE = 2,
214 FB_SYNC_EXT = 4,
215 FB_SYNC_COMP_HIGH_ACT = 8,
216#endif
217};
218
219#if ENABLE_FEATURE_FBSET_READMODE
220static void ss(uint32_t *x, uint32_t flag, char *buf, const char *what)
221{
222 if (strcmp(buf, what) == 0)
223 *x &= ~flag;
224 else
225 *x |= flag;
226}
227
228
229
230
231
232
233
234
235
236
237
238static int read_mode_db(struct fb_var_screeninfo *base, const char *fn,
239 const char *mode)
240{
241 char *token[2], *p, *s;
242 parser_t *parser = config_open(fn);
243
244 while (config_read(parser, token, 2, 1, "# \t\r", PARSE_NORMAL)) {
245 if (strcmp(token[0], "mode") != 0 || !token[1])
246 continue;
247 p = strstr(token[1], mode);
248 if (!p)
249 continue;
250 s = p + strlen(mode);
251
252
253 if (((!*s || isspace(*s)) && '"' != s[-1])
254 || ('"' == *s && '"' == p[-1])
255 ) {
256
257 break;
258 }
259 }
260
261 if (!token[0])
262 return 0;
263
264 while (config_read(parser, token, 2, 1, "# \t", PARSE_NORMAL)) {
265 int i;
266
267
268 if (strcmp(token[0], "endmode") == 0) {
269
270 return 1;
271 }
272 p = token[1];
273 i = index_in_strings(
274 "geometry\0timings\0interlaced\0double\0vsync\0hsync\0csync\0extsync\0rgba\0",
275 token[0]);
276 switch (i) {
277 case 0:
278 if (sizeof(int) == sizeof(base->xres)) {
279 sscanf(p, "%d %d %d %d %d",
280 &base->xres, &base->yres,
281 &base->xres_virtual, &base->yres_virtual,
282 &base->bits_per_pixel);
283 } else {
284 int base_xres, base_yres;
285 int base_xres_virtual, base_yres_virtual;
286 int base_bits_per_pixel;
287 sscanf(p, "%d %d %d %d %d",
288 &base_xres, &base_yres,
289 &base_xres_virtual, &base_yres_virtual,
290 &base_bits_per_pixel);
291 base->xres = base_xres;
292 base->yres = base_yres;
293 base->xres_virtual = base_xres_virtual;
294 base->yres_virtual = base_yres_virtual;
295 base->bits_per_pixel = base_bits_per_pixel;
296 }
297
298 break;
299 case 1:
300 if (sizeof(int) == sizeof(base->xres)) {
301 sscanf(p, "%d %d %d %d %d %d %d",
302 &base->pixclock,
303 &base->left_margin, &base->right_margin,
304 &base->upper_margin, &base->lower_margin,
305 &base->hsync_len, &base->vsync_len);
306 } else {
307 int base_pixclock;
308 int base_left_margin, base_right_margin;
309 int base_upper_margin, base_lower_margin;
310 int base_hsync_len, base_vsync_len;
311 sscanf(p, "%d %d %d %d %d %d %d",
312 &base_pixclock,
313 &base_left_margin, &base_right_margin,
314 &base_upper_margin, &base_lower_margin,
315 &base_hsync_len, &base_vsync_len);
316 base->pixclock = base_pixclock;
317 base->left_margin = base_left_margin;
318 base->right_margin = base_right_margin;
319 base->upper_margin = base_upper_margin;
320 base->lower_margin = base_lower_margin;
321 base->hsync_len = base_hsync_len;
322 base->vsync_len = base_vsync_len;
323 }
324
325 break;
326 case 2:
327 case 3: {
328 static const uint32_t syncs[] = {FB_VMODE_INTERLACED, FB_VMODE_DOUBLE};
329 ss(&base->vmode, syncs[i-2], p, "false");
330
331 break;
332 }
333 case 4:
334 case 5:
335 case 6: {
336 static const uint32_t syncs[] = {FB_SYNC_VERT_HIGH_ACT, FB_SYNC_HOR_HIGH_ACT, FB_SYNC_COMP_HIGH_ACT};
337 ss(&base->sync, syncs[i-4], p, "low");
338
339 break;
340 }
341 case 7:
342 ss(&base->sync, FB_SYNC_EXT, p, "false");
343
344 break;
345 case 8: {
346 int red_offset, red_length;
347 int green_offset, green_length;
348 int blue_offset, blue_length;
349 int transp_offset, transp_length;
350
351 sscanf(p, "%d/%d,%d/%d,%d/%d,%d/%d",
352 &red_length, &red_offset,
353 &green_length, &green_offset,
354 &blue_length, &blue_offset,
355 &transp_length, &transp_offset);
356 base->red.offset = red_offset;
357 base->red.length = red_length;
358 base->red.msb_right = 0;
359 base->green.offset = green_offset;
360 base->green.length = green_length;
361 base->green.msb_right = 0;
362 base->blue.offset = blue_offset;
363 base->blue.length = blue_length;
364 base->blue.msb_right = 0;
365 base->transp.offset = transp_offset;
366 base->transp.length = transp_length;
367 base->transp.msb_right = 0;
368 }
369 }
370 }
371 return 0;
372}
373#endif
374
375static NOINLINE void showmode(struct fb_var_screeninfo *v)
376{
377 double drate = 0, hrate = 0, vrate = 0;
378
379 if (v->pixclock) {
380 drate = 1e12 / v->pixclock;
381 hrate = drate / (v->left_margin + v->xres + v->right_margin + v->hsync_len);
382 vrate = hrate / (v->upper_margin + v->yres + v->lower_margin + v->vsync_len);
383 }
384 printf("\nmode \"%ux%u-%u\"\n"
385#if ENABLE_FEATURE_FBSET_FANCY
386 "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
387#endif
388 "\tgeometry %u %u %u %u %u\n"
389 "\ttimings %u %u %u %u %u %u %u\n"
390 "\taccel %s\n"
391 "\trgba %u/%u,%u/%u,%u/%u,%u/%u\n"
392 "endmode\n\n",
393 v->xres, v->yres, (int) (vrate + 0.5),
394#if ENABLE_FEATURE_FBSET_FANCY
395 drate / 1e6, hrate / 1e3, vrate,
396#endif
397 v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel,
398 v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin,
399 v->hsync_len, v->vsync_len,
400 (v->accel_flags > 0 ? "true" : "false"),
401 v->red.length, v->red.offset, v->green.length, v->green.offset,
402 v->blue.length, v->blue.offset, v->transp.length, v->transp.offset);
403}
404
405int fbset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
406int fbset_main(int argc, char **argv)
407{
408 enum {
409 OPT_CHANGE = (1 << 0),
410 OPT_SHOW = (1 << 1),
411 OPT_READMODE = (1 << 2),
412 OPT_ALL = (1 << 3),
413 };
414 struct fb_var_screeninfo var_old, var_set;
415 int fh, i;
416 unsigned options = 0;
417
418 const char *fbdev = DEFAULTFBDEV;
419 const char *modefile = DEFAULTFBMODE;
420 char *thisarg;
421 char *mode = mode;
422
423 memset(&var_set, 0xff, sizeof(var_set));
424
425
426 argv++;
427 argc--;
428 for (; argc > 0 && (thisarg = *argv) != NULL; argc--, argv++) {
429 if (thisarg[0] != '-') {
430 if (!ENABLE_FEATURE_FBSET_READMODE || argc != 1)
431 bb_show_usage();
432 mode = thisarg;
433 options |= OPT_READMODE;
434 goto contin;
435 }
436 for (i = 0; i < ARRAY_SIZE(g_cmdoptions); i++) {
437 if (strcmp(thisarg + 1, g_cmdoptions[i].name) != 0)
438 continue;
439 if (argc <= g_cmdoptions[i].param_count)
440 bb_show_usage();
441
442 switch (g_cmdoptions[i].code) {
443 case CMD_FB:
444 fbdev = argv[1];
445 break;
446 case CMD_DB:
447 modefile = argv[1];
448 break;
449 case CMD_ALL:
450 options |= OPT_ALL;
451 break;
452 case CMD_SHOW:
453 options |= OPT_SHOW;
454 break;
455 case CMD_GEOMETRY:
456 var_set.xres = xatou32(argv[1]);
457 var_set.yres = xatou32(argv[2]);
458 var_set.xres_virtual = xatou32(argv[3]);
459 var_set.yres_virtual = xatou32(argv[4]);
460 var_set.bits_per_pixel = xatou32(argv[5]);
461 break;
462 case CMD_TIMING:
463 var_set.pixclock = xatou32(argv[1]);
464 var_set.left_margin = xatou32(argv[2]);
465 var_set.right_margin = xatou32(argv[3]);
466 var_set.upper_margin = xatou32(argv[4]);
467 var_set.lower_margin = xatou32(argv[5]);
468 var_set.hsync_len = xatou32(argv[6]);
469 var_set.vsync_len = xatou32(argv[7]);
470 break;
471 case CMD_ACCEL:
472 break;
473 case CMD_HSYNC:
474 var_set.sync |= FB_SYNC_HOR_HIGH_ACT;
475 break;
476 case CMD_VSYNC:
477 var_set.sync |= FB_SYNC_VERT_HIGH_ACT;
478 break;
479#if ENABLE_FEATURE_FBSET_FANCY
480 case CMD_XRES:
481 var_set.xres = xatou32(argv[1]);
482 break;
483 case CMD_YRES:
484 var_set.yres = xatou32(argv[1]);
485 break;
486 case CMD_DEPTH:
487 var_set.bits_per_pixel = xatou32(argv[1]);
488 break;
489#endif
490 }
491 switch (g_cmdoptions[i].code) {
492 case CMD_FB:
493 case CMD_DB:
494 case CMD_ALL:
495 case CMD_SHOW:
496 break;
497 default:
498
499 options |= OPT_CHANGE;
500 }
501 argc -= g_cmdoptions[i].param_count;
502 argv += g_cmdoptions[i].param_count;
503 goto contin;
504 }
505 bb_show_usage();
506 contin: ;
507 }
508
509 fh = xopen(fbdev, O_RDONLY);
510 xioctl(fh, FBIOGET_VSCREENINFO, &var_old);
511
512 if (options & OPT_READMODE) {
513#if ENABLE_FEATURE_FBSET_READMODE
514 if (!read_mode_db(&var_old, modefile, mode)) {
515 bb_error_msg_and_die("unknown video mode '%s'", mode);
516 }
517 options |= OPT_CHANGE;
518#endif
519 }
520
521 if (options & OPT_CHANGE) {
522 copy_changed_values(&var_old, &var_set);
523 if (options & OPT_ALL)
524 var_old.activate = FB_ACTIVATE_ALL;
525 xioctl(fh, FBIOPUT_VSCREENINFO, &var_old);
526 }
527
528 if (options == 0 || (options & OPT_SHOW))
529 showmode(&var_old);
530
531 if (ENABLE_FEATURE_CLEAN_UP)
532 close(fh);
533
534 return EXIT_SUCCESS;
535}
536
