Contents of /tags/mkinitrd-6_3_4/busybox/util-linux/fbset.c
Parent Directory | Revision Log
Revision 1189 -
(show annotations)
(download)
Thu Dec 16 01:27:43 2010 UTC (13 years, 9 months ago) by niro
File MIME type: text/plain
File size: 14292 byte(s)
Thu Dec 16 01:27:43 2010 UTC (13 years, 9 months ago) by niro
File MIME type: text/plain
File size: 14292 byte(s)
tagged 'mkinitrd-6_3_4'
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 | |
20 | /* Stuff stolen from the kernel's fb.h */ |
21 | #define FB_ACTIVATE_ALL 64 |
22 | enum { |
23 | FBIOGET_VSCREENINFO = 0x4600, |
24 | FBIOPUT_VSCREENINFO = 0x4601 |
25 | }; |
26 | |
27 | struct fb_bitfield { |
28 | uint32_t offset; /* beginning of bitfield */ |
29 | uint32_t length; /* length of bitfield */ |
30 | uint32_t msb_right; /* !=0: Most significant bit is right */ |
31 | }; |
32 | struct fb_var_screeninfo { |
33 | uint32_t xres; /* visible resolution */ |
34 | uint32_t yres; |
35 | uint32_t xres_virtual; /* virtual resolution */ |
36 | uint32_t yres_virtual; |
37 | uint32_t xoffset; /* offset from virtual to visible */ |
38 | uint32_t yoffset; /* resolution */ |
39 | |
40 | uint32_t bits_per_pixel; |
41 | uint32_t grayscale; /* !=0 Graylevels instead of colors */ |
42 | |
43 | struct fb_bitfield red; /* bitfield in fb mem if true color, */ |
44 | struct fb_bitfield green; /* else only length is significant */ |
45 | struct fb_bitfield blue; |
46 | struct fb_bitfield transp; /* transparency */ |
47 | |
48 | uint32_t nonstd; /* !=0 Non standard pixel format */ |
49 | |
50 | uint32_t activate; /* see FB_ACTIVATE_x */ |
51 | |
52 | uint32_t height; /* height of picture in mm */ |
53 | uint32_t width; /* width of picture in mm */ |
54 | |
55 | uint32_t accel_flags; /* acceleration flags (hints) */ |
56 | |
57 | /* Timing: All values in pixclocks, except pixclock (of course) */ |
58 | uint32_t pixclock; /* pixel clock in ps (pico seconds) */ |
59 | uint32_t left_margin; /* time from sync to picture */ |
60 | uint32_t right_margin; /* time from picture to sync */ |
61 | uint32_t upper_margin; /* time from sync to picture */ |
62 | uint32_t lower_margin; |
63 | uint32_t hsync_len; /* length of horizontal sync */ |
64 | uint32_t vsync_len; /* length of vertical sync */ |
65 | uint32_t sync; /* see FB_SYNC_x */ |
66 | uint32_t vmode; /* see FB_VMODE_x */ |
67 | uint32_t reserved[6]; /* Reserved for future compatibility */ |
68 | }; |
69 | |
70 | static 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 | |
80 | static NOINLINE void copy_changed_values( |
81 | struct fb_var_screeninfo *base, |
82 | struct fb_var_screeninfo *set) |
83 | { |
84 | //if ((int32_t) set->xres > 0) base->xres = set->xres; |
85 | //if ((int32_t) set->yres > 0) base->yres = set->yres; |
86 | //if ((int32_t) set->xres_virtual > 0) base->xres_virtual = set->xres_virtual; |
87 | //if ((int32_t) set->yres_virtual > 0) base->yres_virtual = set->yres_virtual; |
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 | //copy_if_gt0(&set->bits_per_pixel, &base->bits_per_pixel, 1); |
92 | |
93 | //if ((int32_t) set->pixclock > 0) base->pixclock = set->pixclock; |
94 | //if ((int32_t) set->left_margin > 0) base->left_margin = set->left_margin; |
95 | //if ((int32_t) set->right_margin > 0) base->right_margin = set->right_margin; |
96 | //if ((int32_t) set->upper_margin > 0) base->upper_margin = set->upper_margin; |
97 | //if ((int32_t) set->lower_margin > 0) base->lower_margin = set->lower_margin; |
98 | //if ((int32_t) set->hsync_len > 0) base->hsync_len = set->hsync_len; |
99 | //if ((int32_t) set->vsync_len > 0) base->vsync_len = set->vsync_len; |
100 | //if ((int32_t) set->sync > 0) base->sync = set->sync; |
101 | //if ((int32_t) set->vmode > 0) base->vmode = set->vmode; |
102 | copy_if_gt0(&set->pixclock, &base->pixclock, 9); |
103 | } |
104 | |
105 | |
106 | enum { |
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 | /* CMD_XCOMPAT = 10, */ |
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 | |
146 | static const struct cmdoptions_t { |
147 | const char name[9]; |
148 | const unsigned char param_count; |
149 | const unsigned char code; |
150 | } g_cmdoptions[] = { |
151 | /*"12345678" + NUL */ |
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 | /* taken from linux/fb.h */ |
193 | enum { |
194 | FB_SYNC_HOR_HIGH_ACT = 1, /* horizontal sync high active */ |
195 | FB_SYNC_VERT_HIGH_ACT = 2, /* vertical sync high active */ |
196 | #if ENABLE_FEATURE_FBSET_READMODE |
197 | FB_VMODE_INTERLACED = 1, /* interlaced */ |
198 | FB_VMODE_DOUBLE = 2, /* double scan */ |
199 | FB_SYNC_EXT = 4, /* external sync */ |
200 | FB_SYNC_COMP_HIGH_ACT = 8, /* composite sync high active */ |
201 | #endif |
202 | }; |
203 | |
204 | #if ENABLE_FEATURE_FBSET_READMODE |
205 | static 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 | /* Mode db file contains mode definitions like this: |
214 | * mode "800x600-48-lace" |
215 | * # D: 36.00 MHz, H: 33.835 kHz, V: 96.39 Hz |
216 | * geometry 800 600 800 600 8 |
217 | * timings 27778 56 80 79 11 128 12 |
218 | * laced true |
219 | * hsync high |
220 | * vsync high |
221 | * endmode |
222 | */ |
223 | static 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 | //bb_info_msg("CHECK[%s][%s][%d]", mode, p-1, *s); |
237 | /* exact match? */ |
238 | if (((!*s || isspace(*s)) && '"' != s[-1]) /* end-of-token */ |
239 | || ('"' == *s && '"' == p[-1]) /* ends with " but starts with " too! */ |
240 | ) { |
241 | //bb_info_msg("FOUND[%s][%s][%s][%d]", token[1], p, mode, isspace(*s)); |
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 | //bb_info_msg("???[%s][%s]", token[0], token[1]); |
253 | if (strcmp(token[0], "endmode") == 0) { |
254 | //bb_info_msg("OK[%s]", mode); |
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 | //bb_info_msg("GEO[%s]", p); |
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 | //bb_info_msg("TIM[%s]", p); |
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 | //bb_info_msg("VMODE[%s]", p); |
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 | //bb_info_msg("SYNC[%s]", p); |
324 | break; |
325 | } |
326 | case 7: |
327 | ss(&base->sync, FB_SYNC_EXT, p, "false"); |
328 | //bb_info_msg("EXTSYNC[%s]", p); |
329 | break; |
330 | } |
331 | } |
332 | return 0; |
333 | } |
334 | #endif |
335 | |
336 | static 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 | |
366 | int fbset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
367 | int 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; /* for compiler */ |
383 | |
384 | memset(&var_set, 0xff, sizeof(var_set)); /* set all to -1 */ |
385 | |
386 | /* parse cmd args.... why do they have to make things so difficult? */ |
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 | /* other commands imply changes */ |
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 | } |