Contents of /tags/mkinitrd-6_1_1/busybox/util-linux/fbset.c
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Mon May 4 16:31:54 2009 UTC (15 years, 4 months ago) by niro
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Mon May 4 16:31:54 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 11363 byte(s)
tagged 'mkinitrd-6_1_1'
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 | enum { |
21 | CMD_FB = 1, |
22 | CMD_DB = 2, |
23 | CMD_GEOMETRY = 3, |
24 | CMD_TIMING = 4, |
25 | CMD_ACCEL = 5, |
26 | CMD_HSYNC = 6, |
27 | CMD_VSYNC = 7, |
28 | CMD_LACED = 8, |
29 | CMD_DOUBLE = 9, |
30 | /* CMD_XCOMPAT = 10, */ |
31 | CMD_ALL = 11, |
32 | CMD_INFO = 12, |
33 | CMD_CHANGE = 13, |
34 | |
35 | #if ENABLE_FEATURE_FBSET_FANCY |
36 | CMD_XRES = 100, |
37 | CMD_YRES = 101, |
38 | CMD_VXRES = 102, |
39 | CMD_VYRES = 103, |
40 | CMD_DEPTH = 104, |
41 | CMD_MATCH = 105, |
42 | CMD_PIXCLOCK = 106, |
43 | CMD_LEFT = 107, |
44 | CMD_RIGHT = 108, |
45 | CMD_UPPER = 109, |
46 | CMD_LOWER = 110, |
47 | CMD_HSLEN = 111, |
48 | CMD_VSLEN = 112, |
49 | CMD_CSYNC = 113, |
50 | CMD_GSYNC = 114, |
51 | CMD_EXTSYNC = 115, |
52 | CMD_BCAST = 116, |
53 | CMD_RGBA = 117, |
54 | CMD_STEP = 118, |
55 | CMD_MOVE = 119, |
56 | #endif |
57 | }; |
58 | |
59 | /* Stuff stolen from the kernel's fb.h */ |
60 | #define FB_ACTIVATE_ALL 64 |
61 | enum { |
62 | FBIOGET_VSCREENINFO = 0x4600, |
63 | FBIOPUT_VSCREENINFO = 0x4601 |
64 | }; |
65 | struct fb_bitfield { |
66 | uint32_t offset; /* beginning of bitfield */ |
67 | uint32_t length; /* length of bitfield */ |
68 | uint32_t msb_right; /* !=0: Most significant bit is right */ |
69 | }; |
70 | struct fb_var_screeninfo { |
71 | uint32_t xres; /* visible resolution */ |
72 | uint32_t yres; |
73 | uint32_t xres_virtual; /* virtual resolution */ |
74 | uint32_t yres_virtual; |
75 | uint32_t xoffset; /* offset from virtual to visible */ |
76 | uint32_t yoffset; /* resolution */ |
77 | |
78 | uint32_t bits_per_pixel; |
79 | uint32_t grayscale; /* !=0 Graylevels instead of colors */ |
80 | |
81 | struct fb_bitfield red; /* bitfield in fb mem if true color, */ |
82 | struct fb_bitfield green; /* else only length is significant */ |
83 | struct fb_bitfield blue; |
84 | struct fb_bitfield transp; /* transparency */ |
85 | |
86 | uint32_t nonstd; /* !=0 Non standard pixel format */ |
87 | |
88 | uint32_t activate; /* see FB_ACTIVATE_x */ |
89 | |
90 | uint32_t height; /* height of picture in mm */ |
91 | uint32_t width; /* width of picture in mm */ |
92 | |
93 | uint32_t accel_flags; /* acceleration flags (hints) */ |
94 | |
95 | /* Timing: All values in pixclocks, except pixclock (of course) */ |
96 | uint32_t pixclock; /* pixel clock in ps (pico seconds) */ |
97 | uint32_t left_margin; /* time from sync to picture */ |
98 | uint32_t right_margin; /* time from picture to sync */ |
99 | uint32_t upper_margin; /* time from sync to picture */ |
100 | uint32_t lower_margin; |
101 | uint32_t hsync_len; /* length of horizontal sync */ |
102 | uint32_t vsync_len; /* length of vertical sync */ |
103 | uint32_t sync; /* see FB_SYNC_x */ |
104 | uint32_t vmode; /* see FB_VMODE_x */ |
105 | uint32_t reserved[6]; /* Reserved for future compatibility */ |
106 | }; |
107 | |
108 | |
109 | static const struct cmdoptions_t { |
110 | const char name[9]; |
111 | const unsigned char param_count; |
112 | const unsigned char code; |
113 | } g_cmdoptions[] = { |
114 | /*"12345678" + NUL */ |
115 | { "fb" , 1, CMD_FB }, |
116 | { "db" , 1, CMD_DB }, |
117 | { "a" , 0, CMD_ALL }, |
118 | { "i" , 0, CMD_INFO }, |
119 | { "g" , 5, CMD_GEOMETRY }, |
120 | { "t" , 7, CMD_TIMING }, |
121 | { "accel" , 1, CMD_ACCEL }, |
122 | { "hsync" , 1, CMD_HSYNC }, |
123 | { "vsync" , 1, CMD_VSYNC }, |
124 | { "laced" , 1, CMD_LACED }, |
125 | { "double" , 1, CMD_DOUBLE }, |
126 | { "n" , 0, CMD_CHANGE }, |
127 | #if ENABLE_FEATURE_FBSET_FANCY |
128 | { "all" , 0, CMD_ALL }, |
129 | { "xres" , 1, CMD_XRES }, |
130 | { "yres" , 1, CMD_YRES }, |
131 | { "vxres" , 1, CMD_VXRES }, |
132 | { "vyres" , 1, CMD_VYRES }, |
133 | { "depth" , 1, CMD_DEPTH }, |
134 | { "match" , 0, CMD_MATCH }, |
135 | { "geometry", 5, CMD_GEOMETRY }, |
136 | { "pixclock", 1, CMD_PIXCLOCK }, |
137 | { "left" , 1, CMD_LEFT }, |
138 | { "right" , 1, CMD_RIGHT }, |
139 | { "upper" , 1, CMD_UPPER }, |
140 | { "lower" , 1, CMD_LOWER }, |
141 | { "hslen" , 1, CMD_HSLEN }, |
142 | { "vslen" , 1, CMD_VSLEN }, |
143 | { "timings" , 7, CMD_TIMING }, |
144 | { "csync" , 1, CMD_CSYNC }, |
145 | { "gsync" , 1, CMD_GSYNC }, |
146 | { "extsync" , 1, CMD_EXTSYNC }, |
147 | { "bcast" , 1, CMD_BCAST }, |
148 | { "rgba" , 1, CMD_RGBA }, |
149 | { "step" , 1, CMD_STEP }, |
150 | { "move" , 1, CMD_MOVE }, |
151 | #endif |
152 | }; |
153 | |
154 | #if ENABLE_FEATURE_FBSET_READMODE |
155 | /* taken from linux/fb.h */ |
156 | enum { |
157 | FB_VMODE_INTERLACED = 1, /* interlaced */ |
158 | FB_VMODE_DOUBLE = 2, /* double scan */ |
159 | FB_SYNC_HOR_HIGH_ACT = 1, /* horizontal sync high active */ |
160 | FB_SYNC_VERT_HIGH_ACT = 2, /* vertical sync high active */ |
161 | FB_SYNC_EXT = 4, /* external sync */ |
162 | FB_SYNC_COMP_HIGH_ACT = 8, /* composite sync high active */ |
163 | }; |
164 | #endif |
165 | |
166 | #if ENABLE_FEATURE_FBSET_READMODE |
167 | static void ss(uint32_t *x, uint32_t flag, char *buf, const char *what) |
168 | { |
169 | if (strcmp(buf, what) == 0) |
170 | *x &= ~flag; |
171 | else |
172 | *x |= flag; |
173 | } |
174 | |
175 | static int readmode(struct fb_var_screeninfo *base, const char *fn, |
176 | const char *mode) |
177 | { |
178 | char *token[2], *p, *s; |
179 | parser_t *parser = config_open(fn); |
180 | |
181 | while (config_read(parser, token, 2, 1, "# \t\r", PARSE_NORMAL)) { |
182 | if (strcmp(token[0], "mode") != 0 || !token[1]) |
183 | continue; |
184 | p = strstr(token[1], mode); |
185 | if (!p) |
186 | continue; |
187 | s = p + strlen(mode); |
188 | //bb_info_msg("CHECK[%s][%s][%d]", mode, p-1, *s); |
189 | /* exact match? */ |
190 | if (((!*s || isspace(*s)) && '"' != s[-1]) /* end-of-token */ |
191 | || ('"' == *s && '"' == p[-1]) /* ends with " but starts with " too! */ |
192 | ) { |
193 | //bb_info_msg("FOUND[%s][%s][%s][%d]", token[1], p, mode, isspace(*s)); |
194 | break; |
195 | } |
196 | } |
197 | |
198 | if (!token[0]) |
199 | return 0; |
200 | |
201 | while (config_read(parser, token, 2, 1, "# \t", PARSE_NORMAL)) { |
202 | int i; |
203 | |
204 | //bb_info_msg("???[%s][%s]", token[0], token[1]); |
205 | if (strcmp(token[0], "endmode") == 0) { |
206 | //bb_info_msg("OK[%s]", mode); |
207 | return 1; |
208 | } |
209 | p = token[1]; |
210 | i = index_in_strings( |
211 | "geometry\0timings\0interlaced\0double\0vsync\0hsync\0csync\0extsync\0", |
212 | token[0]); |
213 | switch (i) { |
214 | case 0: |
215 | /* FIXME: catastrophic on arches with 64bit ints */ |
216 | sscanf(p, "%d %d %d %d %d", |
217 | &(base->xres), &(base->yres), |
218 | &(base->xres_virtual), &(base->yres_virtual), |
219 | &(base->bits_per_pixel)); |
220 | //bb_info_msg("GEO[%s]", p); |
221 | break; |
222 | case 1: |
223 | sscanf(p, "%d %d %d %d %d %d %d", |
224 | &(base->pixclock), |
225 | &(base->left_margin), &(base->right_margin), |
226 | &(base->upper_margin), &(base->lower_margin), |
227 | &(base->hsync_len), &(base->vsync_len)); |
228 | //bb_info_msg("TIM[%s]", p); |
229 | break; |
230 | case 2: |
231 | case 3: { |
232 | static const uint32_t syncs[] = {FB_VMODE_INTERLACED, FB_VMODE_DOUBLE}; |
233 | ss(&base->vmode, syncs[i-2], p, "false"); |
234 | //bb_info_msg("VMODE[%s]", p); |
235 | break; |
236 | } |
237 | case 4: |
238 | case 5: |
239 | case 6: { |
240 | static const uint32_t syncs[] = {FB_SYNC_VERT_HIGH_ACT, FB_SYNC_HOR_HIGH_ACT, FB_SYNC_COMP_HIGH_ACT}; |
241 | ss(&base->sync, syncs[i-4], p, "low"); |
242 | //bb_info_msg("SYNC[%s]", p); |
243 | break; |
244 | } |
245 | case 7: |
246 | ss(&base->sync, FB_SYNC_EXT, p, "false"); |
247 | //bb_info_msg("EXTSYNC[%s]", p); |
248 | break; |
249 | } |
250 | } |
251 | return 0; |
252 | } |
253 | #endif |
254 | |
255 | static void setmode(struct fb_var_screeninfo *base, |
256 | struct fb_var_screeninfo *set) |
257 | { |
258 | if ((int32_t) set->xres > 0) |
259 | base->xres = set->xres; |
260 | if ((int32_t) set->yres > 0) |
261 | base->yres = set->yres; |
262 | if ((int32_t) set->xres_virtual > 0) |
263 | base->xres_virtual = set->xres_virtual; |
264 | if ((int32_t) set->yres_virtual > 0) |
265 | base->yres_virtual = set->yres_virtual; |
266 | if ((int32_t) set->bits_per_pixel > 0) |
267 | base->bits_per_pixel = set->bits_per_pixel; |
268 | } |
269 | |
270 | static void showmode(struct fb_var_screeninfo *v) |
271 | { |
272 | double drate = 0, hrate = 0, vrate = 0; |
273 | |
274 | if (v->pixclock) { |
275 | drate = 1e12 / v->pixclock; |
276 | hrate = drate / (v->left_margin + v->xres + v->right_margin + v->hsync_len); |
277 | vrate = hrate / (v->upper_margin + v->yres + v->lower_margin + v->vsync_len); |
278 | } |
279 | printf("\nmode \"%ux%u-%u\"\n" |
280 | #if ENABLE_FEATURE_FBSET_FANCY |
281 | "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n" |
282 | #endif |
283 | "\tgeometry %u %u %u %u %u\n" |
284 | "\ttimings %u %u %u %u %u %u %u\n" |
285 | "\taccel %s\n" |
286 | "\trgba %u/%u,%u/%u,%u/%u,%u/%u\n" |
287 | "endmode\n\n", |
288 | v->xres, v->yres, (int) (vrate + 0.5), |
289 | #if ENABLE_FEATURE_FBSET_FANCY |
290 | drate / 1e6, hrate / 1e3, vrate, |
291 | #endif |
292 | v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel, |
293 | v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin, |
294 | v->hsync_len, v->vsync_len, |
295 | (v->accel_flags > 0 ? "true" : "false"), |
296 | v->red.length, v->red.offset, v->green.length, v->green.offset, |
297 | v->blue.length, v->blue.offset, v->transp.length, v->transp.offset); |
298 | } |
299 | |
300 | int fbset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
301 | int fbset_main(int argc, char **argv) |
302 | { |
303 | enum { |
304 | OPT_CHANGE = (1 << 0), |
305 | /*OPT_INFO = (1 << 1), ??*/ |
306 | OPT_READMODE = (1 << 2), |
307 | OPT_ALL = (1 << 9), |
308 | }; |
309 | struct fb_var_screeninfo var, varset; |
310 | int fh, i; |
311 | unsigned options = 0; |
312 | |
313 | const char *fbdev = DEFAULTFBDEV; |
314 | const char *modefile = DEFAULTFBMODE; |
315 | char *thisarg, *mode = NULL; |
316 | |
317 | memset(&varset, 0xff, sizeof(varset)); |
318 | |
319 | /* parse cmd args.... why do they have to make things so difficult? */ |
320 | argv++; |
321 | argc--; |
322 | for (; argc > 0 && (thisarg = *argv) != NULL; argc--, argv++) { |
323 | if (thisarg[0] == '-') for (i = 0; i < ARRAY_SIZE(g_cmdoptions); i++) { |
324 | if (strcmp(thisarg + 1, g_cmdoptions[i].name) != 0) |
325 | continue; |
326 | if (argc <= g_cmdoptions[i].param_count) |
327 | bb_show_usage(); |
328 | |
329 | switch (g_cmdoptions[i].code) { |
330 | case CMD_FB: |
331 | fbdev = argv[1]; |
332 | break; |
333 | case CMD_DB: |
334 | modefile = argv[1]; |
335 | break; |
336 | case CMD_GEOMETRY: |
337 | varset.xres = xatou32(argv[1]); |
338 | varset.yres = xatou32(argv[2]); |
339 | varset.xres_virtual = xatou32(argv[3]); |
340 | varset.yres_virtual = xatou32(argv[4]); |
341 | varset.bits_per_pixel = xatou32(argv[5]); |
342 | break; |
343 | case CMD_TIMING: |
344 | varset.pixclock = xatou32(argv[1]); |
345 | varset.left_margin = xatou32(argv[2]); |
346 | varset.right_margin = xatou32(argv[3]); |
347 | varset.upper_margin = xatou32(argv[4]); |
348 | varset.lower_margin = xatou32(argv[5]); |
349 | varset.hsync_len = xatou32(argv[6]); |
350 | varset.vsync_len = xatou32(argv[7]); |
351 | break; |
352 | case CMD_ALL: |
353 | options |= OPT_ALL; |
354 | break; |
355 | case CMD_CHANGE: |
356 | options |= OPT_CHANGE; |
357 | break; |
358 | #if ENABLE_FEATURE_FBSET_FANCY |
359 | case CMD_XRES: |
360 | varset.xres = xatou32(argv[1]); |
361 | break; |
362 | case CMD_YRES: |
363 | varset.yres = xatou32(argv[1]); |
364 | break; |
365 | case CMD_DEPTH: |
366 | varset.bits_per_pixel = xatou32(argv[1]); |
367 | break; |
368 | #endif |
369 | } |
370 | argc -= g_cmdoptions[i].param_count; |
371 | argv += g_cmdoptions[i].param_count; |
372 | goto contin; |
373 | } |
374 | if (argc != 1) |
375 | bb_show_usage(); |
376 | mode = *argv; |
377 | options |= OPT_READMODE; |
378 | contin: ; |
379 | } |
380 | |
381 | fh = xopen(fbdev, O_RDONLY); |
382 | xioctl(fh, FBIOGET_VSCREENINFO, &var); |
383 | if (options & OPT_READMODE) { |
384 | #if !ENABLE_FEATURE_FBSET_READMODE |
385 | bb_show_usage(); |
386 | #else |
387 | if (!readmode(&var, modefile, mode)) { |
388 | bb_error_msg_and_die("unknown video mode '%s'", mode); |
389 | } |
390 | #endif |
391 | } |
392 | |
393 | setmode(&var, &varset); |
394 | if (options & OPT_CHANGE) { |
395 | if (options & OPT_ALL) |
396 | var.activate = FB_ACTIVATE_ALL; |
397 | xioctl(fh, FBIOPUT_VSCREENINFO, &var); |
398 | } |
399 | showmode(&var); |
400 | /* Don't close the file, as exiting will take care of that */ |
401 | /* close(fh); */ |
402 | |
403 | return EXIT_SUCCESS; |
404 | } |