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15#include "libbb.h"
16
17#define DEFAULTFBDEV FB_0
18#define DEFAULTFBMODE "/etc/fb.modes"
19
20
21#define FB_ACTIVATE_ALL 64
22enum {
23 FBIOGET_VSCREENINFO = 0x4600,
24 FBIOPUT_VSCREENINFO = 0x4601
25};
26
27struct fb_bitfield {
28 uint32_t offset;
29 uint32_t length;
30 uint32_t msb_right;
31};
32struct fb_var_screeninfo {
33 uint32_t xres;
34 uint32_t yres;
35 uint32_t xres_virtual;
36 uint32_t yres_virtual;
37 uint32_t xoffset;
38 uint32_t yoffset;
39
40 uint32_t bits_per_pixel;
41 uint32_t grayscale;
42
43 struct fb_bitfield red;
44 struct fb_bitfield green;
45 struct fb_bitfield blue;
46 struct fb_bitfield transp;
47
48 uint32_t nonstd;
49
50 uint32_t activate;
51
52 uint32_t height;
53 uint32_t width;
54
55 uint32_t accel_flags;
56
57
58 uint32_t pixclock;
59 uint32_t left_margin;
60 uint32_t right_margin;
61 uint32_t upper_margin;
62 uint32_t lower_margin;
63 uint32_t hsync_len;
64 uint32_t vsync_len;
65 uint32_t sync;
66 uint32_t vmode;
67 uint32_t reserved[6];
68};
69
70static void copy_if_gt0(uint32_t *src, uint32_t *dst, unsigned cnt)
71{
72 do {
73 if ((int32_t) *src > 0)
74 *dst = *src;
75 src++;
76 dst++;
77 } while (--cnt);
78}
79
80static NOINLINE void copy_changed_values(
81 struct fb_var_screeninfo *base,
82 struct fb_var_screeninfo *set)
83{
84
85
86
87
88 copy_if_gt0(&set->xres, &base->xres, 4);
89
90 if ((int32_t) set->bits_per_pixel > 0) base->bits_per_pixel = set->bits_per_pixel;
91
92
93
94
95
96
97
98
99
100
101
102 copy_if_gt0(&set->pixclock, &base->pixclock, 9);
103}
104
105
106enum {
107 CMD_FB = 1,
108 CMD_DB = 2,
109 CMD_GEOMETRY = 3,
110 CMD_TIMING = 4,
111 CMD_ACCEL = 5,
112 CMD_HSYNC = 6,
113 CMD_VSYNC = 7,
114 CMD_LACED = 8,
115 CMD_DOUBLE = 9,
116
117 CMD_ALL = 11,
118 CMD_INFO = 12,
119 CMD_SHOW = 13,
120 CMD_CHANGE = 14,
121
122#if ENABLE_FEATURE_FBSET_FANCY
123 CMD_XRES = 100,
124 CMD_YRES = 101,
125 CMD_VXRES = 102,
126 CMD_VYRES = 103,
127 CMD_DEPTH = 104,
128 CMD_MATCH = 105,
129 CMD_PIXCLOCK = 106,
130 CMD_LEFT = 107,
131 CMD_RIGHT = 108,
132 CMD_UPPER = 109,
133 CMD_LOWER = 110,
134 CMD_HSLEN = 111,
135 CMD_VSLEN = 112,
136 CMD_CSYNC = 113,
137 CMD_GSYNC = 114,
138 CMD_EXTSYNC = 115,
139 CMD_BCAST = 116,
140 CMD_RGBA = 117,
141 CMD_STEP = 118,
142 CMD_MOVE = 119,
143#endif
144};
145
146static const struct cmdoptions_t {
147 const char name[9];
148 const unsigned char param_count;
149 const unsigned char code;
150} g_cmdoptions[] = {
151
152 { "fb" , 1, CMD_FB },
153 { "db" , 1, CMD_DB },
154 { "a" , 0, CMD_ALL },
155 { "i" , 0, CMD_INFO },
156 { "g" , 5, CMD_GEOMETRY },
157 { "t" , 7, CMD_TIMING },
158 { "accel" , 1, CMD_ACCEL },
159 { "hsync" , 1, CMD_HSYNC },
160 { "vsync" , 1, CMD_VSYNC },
161 { "laced" , 1, CMD_LACED },
162 { "double" , 1, CMD_DOUBLE },
163 { "show" , 0, CMD_SHOW },
164 { "s" , 0, CMD_SHOW },
165#if ENABLE_FEATURE_FBSET_FANCY
166 { "all" , 0, CMD_ALL },
167 { "xres" , 1, CMD_XRES },
168 { "yres" , 1, CMD_YRES },
169 { "vxres" , 1, CMD_VXRES },
170 { "vyres" , 1, CMD_VYRES },
171 { "depth" , 1, CMD_DEPTH },
172 { "match" , 0, CMD_MATCH },
173 { "geometry", 5, CMD_GEOMETRY },
174 { "pixclock", 1, CMD_PIXCLOCK },
175 { "left" , 1, CMD_LEFT },
176 { "right" , 1, CMD_RIGHT },
177 { "upper" , 1, CMD_UPPER },
178 { "lower" , 1, CMD_LOWER },
179 { "hslen" , 1, CMD_HSLEN },
180 { "vslen" , 1, CMD_VSLEN },
181 { "timings" , 7, CMD_TIMING },
182 { "csync" , 1, CMD_CSYNC },
183 { "gsync" , 1, CMD_GSYNC },
184 { "extsync" , 1, CMD_EXTSYNC },
185 { "bcast" , 1, CMD_BCAST },
186 { "rgba" , 1, CMD_RGBA },
187 { "step" , 1, CMD_STEP },
188 { "move" , 1, CMD_MOVE },
189#endif
190};
191
192
193enum {
194 FB_SYNC_HOR_HIGH_ACT = 1,
195 FB_SYNC_VERT_HIGH_ACT = 2,
196#if ENABLE_FEATURE_FBSET_READMODE
197 FB_VMODE_INTERLACED = 1,
198 FB_VMODE_DOUBLE = 2,
199 FB_SYNC_EXT = 4,
200 FB_SYNC_COMP_HIGH_ACT = 8,
201#endif
202};
203
204#if ENABLE_FEATURE_FBSET_READMODE
205static void ss(uint32_t *x, uint32_t flag, char *buf, const char *what)
206{
207 if (strcmp(buf, what) == 0)
208 *x &= ~flag;
209 else
210 *x |= flag;
211}
212
213
214
215
216
217
218
219
220
221
222
223static int read_mode_db(struct fb_var_screeninfo *base, const char *fn,
224 const char *mode)
225{
226 char *token[2], *p, *s;
227 parser_t *parser = config_open(fn);
228
229 while (config_read(parser, token, 2, 1, "# \t\r", PARSE_NORMAL)) {
230 if (strcmp(token[0], "mode") != 0 || !token[1])
231 continue;
232 p = strstr(token[1], mode);
233 if (!p)
234 continue;
235 s = p + strlen(mode);
236
237
238 if (((!*s || isspace(*s)) && '"' != s[-1])
239 || ('"' == *s && '"' == p[-1])
240 ) {
241
242 break;
243 }
244 }
245
246 if (!token[0])
247 return 0;
248
249 while (config_read(parser, token, 2, 1, "# \t", PARSE_NORMAL)) {
250 int i;
251
252
253 if (strcmp(token[0], "endmode") == 0) {
254
255 return 1;
256 }
257 p = token[1];
258 i = index_in_strings(
259 "geometry\0timings\0interlaced\0double\0vsync\0hsync\0csync\0extsync\0",
260 token[0]);
261 switch (i) {
262 case 0:
263 if (sizeof(int) == sizeof(base->xres)) {
264 sscanf(p, "%d %d %d %d %d",
265 &base->xres, &base->yres,
266 &base->xres_virtual, &base->yres_virtual,
267 &base->bits_per_pixel);
268 } else {
269 int base_xres, base_yres;
270 int base_xres_virtual, base_yres_virtual;
271 int base_bits_per_pixel;
272 sscanf(p, "%d %d %d %d %d",
273 &base_xres, &base_yres,
274 &base_xres_virtual, &base_yres_virtual,
275 &base_bits_per_pixel);
276 base->xres = base_xres;
277 base->yres = base_yres;
278 base->xres_virtual = base_xres_virtual;
279 base->yres_virtual = base_yres_virtual;
280 base->bits_per_pixel = base_bits_per_pixel;
281 }
282
283 break;
284 case 1:
285 if (sizeof(int) == sizeof(base->xres)) {
286 sscanf(p, "%d %d %d %d %d %d %d",
287 &base->pixclock,
288 &base->left_margin, &base->right_margin,
289 &base->upper_margin, &base->lower_margin,
290 &base->hsync_len, &base->vsync_len);
291 } else {
292 int base_pixclock;
293 int base_left_margin, base_right_margin;
294 int base_upper_margin, base_lower_margin;
295 int base_hsync_len, base_vsync_len;
296 sscanf(p, "%d %d %d %d %d %d %d",
297 &base_pixclock,
298 &base_left_margin, &base_right_margin,
299 &base_upper_margin, &base_lower_margin,
300 &base_hsync_len, &base_vsync_len);
301 base->pixclock = base_pixclock;
302 base->left_margin = base_left_margin;
303 base->right_margin = base_right_margin;
304 base->upper_margin = base_upper_margin;
305 base->lower_margin = base_lower_margin;
306 base->hsync_len = base_hsync_len;
307 base->vsync_len = base_vsync_len;
308 }
309
310 break;
311 case 2:
312 case 3: {
313 static const uint32_t syncs[] = {FB_VMODE_INTERLACED, FB_VMODE_DOUBLE};
314 ss(&base->vmode, syncs[i-2], p, "false");
315
316 break;
317 }
318 case 4:
319 case 5:
320 case 6: {
321 static const uint32_t syncs[] = {FB_SYNC_VERT_HIGH_ACT, FB_SYNC_HOR_HIGH_ACT, FB_SYNC_COMP_HIGH_ACT};
322 ss(&base->sync, syncs[i-4], p, "low");
323
324 break;
325 }
326 case 7:
327 ss(&base->sync, FB_SYNC_EXT, p, "false");
328
329 break;
330 }
331 }
332 return 0;
333}
334#endif
335
336static NOINLINE void showmode(struct fb_var_screeninfo *v)
337{
338 double drate = 0, hrate = 0, vrate = 0;
339
340 if (v->pixclock) {
341 drate = 1e12 / v->pixclock;
342 hrate = drate / (v->left_margin + v->xres + v->right_margin + v->hsync_len);
343 vrate = hrate / (v->upper_margin + v->yres + v->lower_margin + v->vsync_len);
344 }
345 printf("\nmode \"%ux%u-%u\"\n"
346#if ENABLE_FEATURE_FBSET_FANCY
347 "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
348#endif
349 "\tgeometry %u %u %u %u %u\n"
350 "\ttimings %u %u %u %u %u %u %u\n"
351 "\taccel %s\n"
352 "\trgba %u/%u,%u/%u,%u/%u,%u/%u\n"
353 "endmode\n\n",
354 v->xres, v->yres, (int) (vrate + 0.5),
355#if ENABLE_FEATURE_FBSET_FANCY
356 drate / 1e6, hrate / 1e3, vrate,
357#endif
358 v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel,
359 v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin,
360 v->hsync_len, v->vsync_len,
361 (v->accel_flags > 0 ? "true" : "false"),
362 v->red.length, v->red.offset, v->green.length, v->green.offset,
363 v->blue.length, v->blue.offset, v->transp.length, v->transp.offset);
364}
365
366int fbset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
367int fbset_main(int argc, char **argv)
368{
369 enum {
370 OPT_CHANGE = (1 << 0),
371 OPT_SHOW = (1 << 1),
372 OPT_READMODE = (1 << 2),
373 OPT_ALL = (1 << 9),
374 };
375 struct fb_var_screeninfo var_old, var_set;
376 int fh, i;
377 unsigned options = 0;
378
379 const char *fbdev = DEFAULTFBDEV;
380 const char *modefile = DEFAULTFBMODE;
381 char *thisarg;
382 char *mode = mode;
383
384 memset(&var_set, 0xff, sizeof(var_set));
385
386
387 argv++;
388 argc--;
389 for (; argc > 0 && (thisarg = *argv) != NULL; argc--, argv++) {
390 if (thisarg[0] == '-') for (i = 0; i < ARRAY_SIZE(g_cmdoptions); i++) {
391 if (strcmp(thisarg + 1, g_cmdoptions[i].name) != 0)
392 continue;
393 if (argc <= g_cmdoptions[i].param_count)
394 bb_show_usage();
395
396 switch (g_cmdoptions[i].code) {
397 case CMD_FB:
398 fbdev = argv[1];
399 break;
400 case CMD_DB:
401 modefile = argv[1];
402 break;
403 case CMD_ALL:
404 options |= OPT_ALL;
405 break;
406 case CMD_SHOW:
407 options |= OPT_SHOW;
408 break;
409 case CMD_GEOMETRY:
410 var_set.xres = xatou32(argv[1]);
411 var_set.yres = xatou32(argv[2]);
412 var_set.xres_virtual = xatou32(argv[3]);
413 var_set.yres_virtual = xatou32(argv[4]);
414 var_set.bits_per_pixel = xatou32(argv[5]);
415 break;
416 case CMD_TIMING:
417 var_set.pixclock = xatou32(argv[1]);
418 var_set.left_margin = xatou32(argv[2]);
419 var_set.right_margin = xatou32(argv[3]);
420 var_set.upper_margin = xatou32(argv[4]);
421 var_set.lower_margin = xatou32(argv[5]);
422 var_set.hsync_len = xatou32(argv[6]);
423 var_set.vsync_len = xatou32(argv[7]);
424 break;
425 case CMD_ACCEL:
426 break;
427 case CMD_HSYNC:
428 var_set.sync |= FB_SYNC_HOR_HIGH_ACT;
429 break;
430 case CMD_VSYNC:
431 var_set.sync |= FB_SYNC_VERT_HIGH_ACT;
432 break;
433#if ENABLE_FEATURE_FBSET_FANCY
434 case CMD_XRES:
435 var_set.xres = xatou32(argv[1]);
436 break;
437 case CMD_YRES:
438 var_set.yres = xatou32(argv[1]);
439 break;
440 case CMD_DEPTH:
441 var_set.bits_per_pixel = xatou32(argv[1]);
442 break;
443#endif
444 }
445 switch (g_cmdoptions[i].code) {
446 case CMD_FB:
447 case CMD_DB:
448 case CMD_ALL:
449 case CMD_SHOW:
450 break;
451 default:
452
453 options |= OPT_CHANGE;
454 }
455 argc -= g_cmdoptions[i].param_count;
456 argv += g_cmdoptions[i].param_count;
457 goto contin;
458 }
459 if (!ENABLE_FEATURE_FBSET_READMODE || argc != 1)
460 bb_show_usage();
461 mode = *argv;
462 options |= OPT_READMODE;
463 contin: ;
464 }
465
466 fh = xopen(fbdev, O_RDONLY);
467 xioctl(fh, FBIOGET_VSCREENINFO, &var_old);
468
469 if (options & OPT_READMODE) {
470#if ENABLE_FEATURE_FBSET_READMODE
471 if (!read_mode_db(&var_old, modefile, mode)) {
472 bb_error_msg_and_die("unknown video mode '%s'", mode);
473 }
474#endif
475 }
476
477 if (options & OPT_CHANGE) {
478 copy_changed_values(&var_old, &var_set);
479 if (options & OPT_ALL)
480 var_old.activate = FB_ACTIVATE_ALL;
481 xioctl(fh, FBIOPUT_VSCREENINFO, &var_old);
482 }
483
484 if (options == 0 || (options & OPT_SHOW))
485 showmode(&var_old);
486
487 if (ENABLE_FEATURE_CLEAN_UP)
488 close(fh);
489
490 return EXIT_SUCCESS;
491}
492
