Contents of /trunk/mkinitrd-magellan/busybox/util-linux/fbset.c
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 11230 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
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 "busybox.h" |
16 | |
17 | #define DEFAULTFBDEV FB_0 |
18 | #define DEFAULTFBMODE "/etc/fb.modes" |
19 | |
20 | enum { |
21 | OPT_CHANGE = (1 << 0), |
22 | OPT_INFO = (1 << 1), |
23 | OPT_READMODE = (1 << 2), |
24 | OPT_ALL = (1 << 9), |
25 | |
26 | CMD_FB = 1, |
27 | CMD_DB = 2, |
28 | CMD_GEOMETRY = 3, |
29 | CMD_TIMING = 4, |
30 | CMD_ACCEL = 5, |
31 | CMD_HSYNC = 6, |
32 | CMD_VSYNC = 7, |
33 | CMD_LACED = 8, |
34 | CMD_DOUBLE = 9, |
35 | /* CMD_XCOMPAT = 10, */ |
36 | CMD_ALL = 11, |
37 | CMD_INFO = 12, |
38 | CMD_CHANGE = 13, |
39 | |
40 | #ifdef CONFIG_FEATURE_FBSET_FANCY |
41 | CMD_XRES = 100, |
42 | CMD_YRES = 101, |
43 | CMD_VXRES = 102, |
44 | CMD_VYRES = 103, |
45 | CMD_DEPTH = 104, |
46 | CMD_MATCH = 105, |
47 | CMD_PIXCLOCK = 106, |
48 | CMD_LEFT = 107, |
49 | CMD_RIGHT = 108, |
50 | CMD_UPPER = 109, |
51 | CMD_LOWER = 110, |
52 | CMD_HSLEN = 111, |
53 | CMD_VSLEN = 112, |
54 | CMD_CSYNC = 113, |
55 | CMD_GSYNC = 114, |
56 | CMD_EXTSYNC = 115, |
57 | CMD_BCAST = 116, |
58 | CMD_RGBA = 117, |
59 | CMD_STEP = 118, |
60 | CMD_MOVE = 119, |
61 | #endif |
62 | }; |
63 | |
64 | static unsigned g_options; |
65 | |
66 | /* Stuff stolen from the kernel's fb.h */ |
67 | #define FB_ACTIVATE_ALL 64 |
68 | enum { |
69 | FBIOGET_VSCREENINFO = 0x4600, |
70 | FBIOPUT_VSCREENINFO = 0x4601 |
71 | }; |
72 | struct fb_bitfield { |
73 | uint32_t offset; /* beginning of bitfield */ |
74 | uint32_t length; /* length of bitfield */ |
75 | uint32_t msb_right; /* !=0: Most significant bit is right */ |
76 | }; |
77 | struct fb_var_screeninfo { |
78 | uint32_t xres; /* visible resolution */ |
79 | uint32_t yres; |
80 | uint32_t xres_virtual; /* virtual resolution */ |
81 | uint32_t yres_virtual; |
82 | uint32_t xoffset; /* offset from virtual to visible */ |
83 | uint32_t yoffset; /* resolution */ |
84 | |
85 | uint32_t bits_per_pixel; |
86 | uint32_t grayscale; /* !=0 Graylevels instead of colors */ |
87 | |
88 | struct fb_bitfield red; /* bitfield in fb mem if true color, */ |
89 | struct fb_bitfield green; /* else only length is significant */ |
90 | struct fb_bitfield blue; |
91 | struct fb_bitfield transp; /* transparency */ |
92 | |
93 | uint32_t nonstd; /* !=0 Non standard pixel format */ |
94 | |
95 | uint32_t activate; /* see FB_ACTIVATE_x */ |
96 | |
97 | uint32_t height; /* height of picture in mm */ |
98 | uint32_t width; /* width of picture in mm */ |
99 | |
100 | uint32_t accel_flags; /* acceleration flags (hints) */ |
101 | |
102 | /* Timing: All values in pixclocks, except pixclock (of course) */ |
103 | uint32_t pixclock; /* pixel clock in ps (pico seconds) */ |
104 | uint32_t left_margin; /* time from sync to picture */ |
105 | uint32_t right_margin; /* time from picture to sync */ |
106 | uint32_t upper_margin; /* time from sync to picture */ |
107 | uint32_t lower_margin; |
108 | uint32_t hsync_len; /* length of horizontal sync */ |
109 | uint32_t vsync_len; /* length of vertical sync */ |
110 | uint32_t sync; /* see FB_SYNC_x */ |
111 | uint32_t vmode; /* see FB_VMODE_x */ |
112 | uint32_t reserved[6]; /* Reserved for future compatibility */ |
113 | }; |
114 | |
115 | |
116 | static const struct cmdoptions_t { |
117 | const char name[10]; |
118 | const unsigned char param_count; |
119 | const unsigned char code; |
120 | } g_cmdoptions[] = { |
121 | { "-fb", 1, CMD_FB }, |
122 | { "-db", 1, CMD_DB }, |
123 | { "-a", 0, CMD_ALL }, |
124 | { "-i", 0, CMD_INFO }, |
125 | { "-g", 5, CMD_GEOMETRY }, |
126 | { "-t", 7, CMD_TIMING }, |
127 | { "-accel", 1, CMD_ACCEL }, |
128 | { "-hsync", 1, CMD_HSYNC }, |
129 | { "-vsync", 1, CMD_VSYNC }, |
130 | { "-laced", 1, CMD_LACED }, |
131 | { "-double", 1, CMD_DOUBLE }, |
132 | { "-n", 0, CMD_CHANGE }, |
133 | #ifdef CONFIG_FEATURE_FBSET_FANCY |
134 | { "-all", 0, CMD_ALL }, |
135 | { "-xres", 1, CMD_XRES }, |
136 | { "-yres", 1, CMD_YRES }, |
137 | { "-vxres", 1, CMD_VXRES }, |
138 | { "-vyres", 1, CMD_VYRES }, |
139 | { "-depth", 1, CMD_DEPTH }, |
140 | { "-match", 0, CMD_MATCH }, |
141 | { "-geometry", 5, CMD_GEOMETRY }, |
142 | { "-pixclock", 1, CMD_PIXCLOCK }, |
143 | { "-left", 1, CMD_LEFT }, |
144 | { "-right", 1, CMD_RIGHT }, |
145 | { "-upper", 1, CMD_UPPER }, |
146 | { "-lower", 1, CMD_LOWER }, |
147 | { "-hslen", 1, CMD_HSLEN }, |
148 | { "-vslen", 1, CMD_VSLEN }, |
149 | { "-timings", 7, CMD_TIMING }, |
150 | { "-csync", 1, CMD_CSYNC }, |
151 | { "-gsync", 1, CMD_GSYNC }, |
152 | { "-extsync", 1, CMD_EXTSYNC }, |
153 | { "-bcast", 1, CMD_BCAST }, |
154 | { "-rgba", 1, CMD_RGBA }, |
155 | { "-step", 1, CMD_STEP }, |
156 | { "-move", 1, CMD_MOVE }, |
157 | #endif |
158 | { "", 0, 0 } |
159 | }; |
160 | |
161 | #ifdef CONFIG_FEATURE_FBSET_READMODE |
162 | /* taken from linux/fb.h */ |
163 | enum { |
164 | FB_VMODE_INTERLACED = 1, /* interlaced */ |
165 | FB_VMODE_DOUBLE = 2, /* double scan */ |
166 | FB_SYNC_HOR_HIGH_ACT = 1, /* horizontal sync high active */ |
167 | FB_SYNC_VERT_HIGH_ACT = 2, /* vertical sync high active */ |
168 | FB_SYNC_EXT = 4, /* external sync */ |
169 | FB_SYNC_COMP_HIGH_ACT = 8 /* composite sync high active */ |
170 | }; |
171 | #endif |
172 | |
173 | static int readmode(struct fb_var_screeninfo *base, const char *fn, |
174 | const char *mode) |
175 | { |
176 | #ifdef CONFIG_FEATURE_FBSET_READMODE |
177 | FILE *f; |
178 | char buf[256]; |
179 | char *p = buf; |
180 | |
181 | f = xfopen(fn, "r"); |
182 | while (!feof(f)) { |
183 | fgets(buf, sizeof(buf), f); |
184 | if (!(p = strstr(buf, "mode ")) && !(p = strstr(buf, "mode\t"))) |
185 | continue; |
186 | p += 5; |
187 | if (!(p = strstr(buf, mode))) |
188 | continue; |
189 | p += strlen(mode); |
190 | if (!isspace(*p) && (*p != 0) && (*p != '"') |
191 | && (*p != '\r') && (*p != '\n')) |
192 | continue; /* almost, but not quite */ |
193 | |
194 | while (!feof(f)) { |
195 | fgets(buf, sizeof(buf), f); |
196 | if ((p = strstr(buf, "geometry "))) { |
197 | p += 9; |
198 | /* FIXME: catastrophic on arches with 64bit ints */ |
199 | sscanf(p, "%d %d %d %d %d", |
200 | &(base->xres), &(base->yres), |
201 | &(base->xres_virtual), &(base->yres_virtual), |
202 | &(base->bits_per_pixel)); |
203 | } else if ((p = strstr(buf, "timings "))) { |
204 | p += 8; |
205 | sscanf(p, "%d %d %d %d %d %d %d", |
206 | &(base->pixclock), |
207 | &(base->left_margin), &(base->right_margin), |
208 | &(base->upper_margin), &(base->lower_margin), |
209 | &(base->hsync_len), &(base->vsync_len)); |
210 | } else if ((p = strstr(buf, "laced "))) { |
211 | //p += 6; |
212 | if (strstr(buf, "false")) { |
213 | base->vmode &= ~FB_VMODE_INTERLACED; |
214 | } else { |
215 | base->vmode |= FB_VMODE_INTERLACED; |
216 | } |
217 | } else if ((p = strstr(buf, "double "))) { |
218 | //p += 7; |
219 | if (strstr(buf, "false")) { |
220 | base->vmode &= ~FB_VMODE_DOUBLE; |
221 | } else { |
222 | base->vmode |= FB_VMODE_DOUBLE; |
223 | } |
224 | } else if ((p = strstr(buf, "vsync "))) { |
225 | //p += 6; |
226 | if (strstr(buf, "low")) { |
227 | base->sync &= ~FB_SYNC_VERT_HIGH_ACT; |
228 | } else { |
229 | base->sync |= FB_SYNC_VERT_HIGH_ACT; |
230 | } |
231 | } else if ((p = strstr(buf, "hsync "))) { |
232 | //p += 6; |
233 | if (strstr(buf, "low")) { |
234 | base->sync &= ~FB_SYNC_HOR_HIGH_ACT; |
235 | } else { |
236 | base->sync |= FB_SYNC_HOR_HIGH_ACT; |
237 | } |
238 | } else if ((p = strstr(buf, "csync "))) { |
239 | //p += 6; |
240 | if (strstr(buf, "low")) { |
241 | base->sync &= ~FB_SYNC_COMP_HIGH_ACT; |
242 | } else { |
243 | base->sync |= FB_SYNC_COMP_HIGH_ACT; |
244 | } |
245 | } else if ((p = strstr(buf, "extsync "))) { |
246 | //p += 8; |
247 | if (strstr(buf, "false")) { |
248 | base->sync &= ~FB_SYNC_EXT; |
249 | } else { |
250 | base->sync |= FB_SYNC_EXT; |
251 | } |
252 | } |
253 | |
254 | if (strstr(buf, "endmode")) |
255 | return 1; |
256 | } |
257 | } |
258 | #else |
259 | bb_error_msg("mode reading not compiled in"); |
260 | #endif |
261 | return 0; |
262 | } |
263 | |
264 | static inline void setmode(struct fb_var_screeninfo *base, |
265 | struct fb_var_screeninfo *set) |
266 | { |
267 | if ((int) set->xres > 0) |
268 | base->xres = set->xres; |
269 | if ((int) set->yres > 0) |
270 | base->yres = set->yres; |
271 | if ((int) set->xres_virtual > 0) |
272 | base->xres_virtual = set->xres_virtual; |
273 | if ((int) set->yres_virtual > 0) |
274 | base->yres_virtual = set->yres_virtual; |
275 | if ((int) set->bits_per_pixel > 0) |
276 | base->bits_per_pixel = set->bits_per_pixel; |
277 | } |
278 | |
279 | static inline void showmode(struct fb_var_screeninfo *v) |
280 | { |
281 | double drate = 0, hrate = 0, vrate = 0; |
282 | |
283 | if (v->pixclock) { |
284 | drate = 1e12 / v->pixclock; |
285 | hrate = drate / (v->left_margin + v->xres + v->right_margin + v->hsync_len); |
286 | vrate = hrate / (v->upper_margin + v->yres + v->lower_margin + v->vsync_len); |
287 | } |
288 | printf("\nmode \"%ux%u-%u\"\n" |
289 | #ifdef CONFIG_FEATURE_FBSET_FANCY |
290 | "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n" |
291 | #endif |
292 | "\tgeometry %u %u %u %u %u\n" |
293 | "\ttimings %u %u %u %u %u %u %u\n" |
294 | "\taccel %s\n" |
295 | "\trgba %u/%u,%u/%u,%u/%u,%u/%u\n" |
296 | "endmode\n\n", |
297 | v->xres, v->yres, (int) (vrate + 0.5), |
298 | #ifdef CONFIG_FEATURE_FBSET_FANCY |
299 | drate / 1e6, hrate / 1e3, vrate, |
300 | #endif |
301 | v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel, |
302 | v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin, |
303 | v->hsync_len, v->vsync_len, |
304 | (v->accel_flags > 0 ? "true" : "false"), |
305 | v->red.length, v->red.offset, v->green.length, v->green.offset, |
306 | v->blue.length, v->blue.offset, v->transp.length, v->transp.offset); |
307 | } |
308 | |
309 | #ifdef STANDALONE |
310 | int main(int argc, char **argv) |
311 | #else |
312 | int fbset_main(int argc, char **argv) |
313 | #endif |
314 | { |
315 | struct fb_var_screeninfo var, varset; |
316 | int fh, i; |
317 | char *fbdev = DEFAULTFBDEV; |
318 | char *modefile = DEFAULTFBMODE; |
319 | char *thisarg, *mode = NULL; |
320 | |
321 | memset(&varset, 0xFF, sizeof(varset)); |
322 | |
323 | /* parse cmd args.... why do they have to make things so difficult? */ |
324 | argv++; |
325 | argc--; |
326 | for (; argc > 0 && (thisarg = *argv); argc--, argv++) { |
327 | for (i = 0; g_cmdoptions[i].name[0]; i++) { |
328 | if (strcmp(thisarg, g_cmdoptions[i].name)) |
329 | continue; |
330 | if (argc-1 < g_cmdoptions[i].param_count) |
331 | bb_show_usage(); |
332 | |
333 | switch (g_cmdoptions[i].code) { |
334 | case CMD_FB: |
335 | fbdev = argv[1]; |
336 | break; |
337 | case CMD_DB: |
338 | modefile = argv[1]; |
339 | break; |
340 | case CMD_GEOMETRY: |
341 | varset.xres = xatou32(argv[1]); |
342 | varset.yres = xatou32(argv[2]); |
343 | varset.xres_virtual = xatou32(argv[3]); |
344 | varset.yres_virtual = xatou32(argv[4]); |
345 | varset.bits_per_pixel = xatou32(argv[5]); |
346 | break; |
347 | case CMD_TIMING: |
348 | varset.pixclock = xatou32(argv[1]); |
349 | varset.left_margin = xatou32(argv[2]); |
350 | varset.right_margin = xatou32(argv[3]); |
351 | varset.upper_margin = xatou32(argv[4]); |
352 | varset.lower_margin = xatou32(argv[5]); |
353 | varset.hsync_len = xatou32(argv[6]); |
354 | varset.vsync_len = xatou32(argv[7]); |
355 | break; |
356 | case CMD_ALL: |
357 | g_options |= OPT_ALL; |
358 | break; |
359 | case CMD_CHANGE: |
360 | g_options |= OPT_CHANGE; |
361 | break; |
362 | #ifdef CONFIG_FEATURE_FBSET_FANCY |
363 | case CMD_XRES: |
364 | varset.xres = xatou32(argv[1]); |
365 | break; |
366 | case CMD_YRES: |
367 | varset.yres = xatou32(argv[1]); |
368 | break; |
369 | case CMD_DEPTH: |
370 | varset.bits_per_pixel = xatou32(argv[1]); |
371 | break; |
372 | #endif |
373 | } |
374 | argc -= g_cmdoptions[i].param_count; |
375 | argv += g_cmdoptions[i].param_count; |
376 | break; |
377 | } |
378 | if (!g_cmdoptions[i].name[0]) { |
379 | if (argc != 1) |
380 | bb_show_usage(); |
381 | mode = *argv; |
382 | g_options |= OPT_READMODE; |
383 | } |
384 | } |
385 | |
386 | fh = xopen(fbdev, O_RDONLY); |
387 | if (ioctl(fh, FBIOGET_VSCREENINFO, &var)) |
388 | bb_perror_msg_and_die("ioctl(%sT_VSCREENINFO)", "GE"); |
389 | if (g_options & OPT_READMODE) { |
390 | if (!readmode(&var, modefile, mode)) { |
391 | bb_error_msg_and_die("unknown video mode '%s'", mode); |
392 | } |
393 | } |
394 | |
395 | setmode(&var, &varset); |
396 | if (g_options & OPT_CHANGE) { |
397 | if (g_options & OPT_ALL) |
398 | var.activate = FB_ACTIVATE_ALL; |
399 | if (ioctl(fh, FBIOPUT_VSCREENINFO, &var)) |
400 | bb_perror_msg_and_die("ioctl(%sT_VSCREENINFO)", "PU"); |
401 | } |
402 | showmode(&var); |
403 | /* Don't close the file, as exiting will take care of that */ |
404 | /* close(fh); */ |
405 | |
406 | return EXIT_SUCCESS; |
407 | } |