File: /usr/src/linux/drivers/video/modedb.c
1 /*
2 * linux/drivers/video/modedb.c -- Standard video mode database management
3 *
4 * Copyright (C) 1999 Geert Uytterhoeven
5 *
6 * 2001 - Documented with DocBook
7 * - Brad Douglas <brad@neruo.com>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive for
11 * more details.
12 */
13
14 #include <linux/module.h>
15 #include <linux/tty.h>
16 #include <linux/fb.h>
17 #include <linux/console_struct.h>
18 #include <linux/sched.h>
19
20
21 #undef DEBUG
22
23 #define name_matches(v, s, l) \
24 ((v).name && !strncmp((s), (v).name, (l)) && strlen((v).name) == (l))
25 #define res_matches(v, x, y) \
26 ((v).xres == (x) && (v).yres == (y))
27
28 #ifdef DEBUG
29 #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
30 #else
31 #define DPRINTK(fmt, args...)
32 #endif
33
34
35 const char *global_mode_option = NULL;
36
37
38 /*
39 * Standard video mode definitions (taken from XFree86)
40 */
41
42 #define DEFAULT_MODEDB_INDEX 0
43
44 static const struct fb_videomode modedb[] __initdata = {
45 {
46 /* 640x400 @ 70 Hz, 31.5 kHz hsync */
47 NULL, 70, 640, 400, 39721, 40, 24, 39, 9, 96, 2,
48 0, FB_VMODE_NONINTERLACED
49 }, {
50 /* 640x480 @ 60 Hz, 31.5 kHz hsync */
51 NULL, 60, 640, 480, 39721, 40, 24, 32, 11, 96, 2,
52 0, FB_VMODE_NONINTERLACED
53 }, {
54 /* 800x600 @ 56 Hz, 35.15 kHz hsync */
55 NULL, 56, 800, 600, 27777, 128, 24, 22, 1, 72, 2,
56 0, FB_VMODE_NONINTERLACED
57 }, {
58 /* 1024x768 @ 87 Hz interlaced, 35.5 kHz hsync */
59 NULL, 87, 1024, 768, 22271, 56, 24, 33, 8, 160, 8,
60 0, FB_VMODE_INTERLACED
61 }, {
62 /* 640x400 @ 85 Hz, 37.86 kHz hsync */
63 NULL, 85, 640, 400, 31746, 96, 32, 41, 1, 64, 3,
64 FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
65 }, {
66 /* 640x480 @ 72 Hz, 36.5 kHz hsync */
67 NULL, 72, 640, 480, 31746, 144, 40, 30, 8, 40, 3,
68 0, FB_VMODE_NONINTERLACED
69 }, {
70 /* 640x480 @ 75 Hz, 37.50 kHz hsync */
71 NULL, 75, 640, 480, 31746, 120, 16, 16, 1, 64, 3,
72 0, FB_VMODE_NONINTERLACED
73 }, {
74 /* 800x600 @ 60 Hz, 37.8 kHz hsync */
75 NULL, 60, 800, 600, 25000, 88, 40, 23, 1, 128, 4,
76 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
77 }, {
78 /* 640x480 @ 85 Hz, 43.27 kHz hsync */
79 NULL, 85, 640, 480, 27777, 80, 56, 25, 1, 56, 3,
80 0, FB_VMODE_NONINTERLACED
81 }, {
82 /* 1152x864 @ 89 Hz interlaced, 44 kHz hsync */
83 NULL, 69, 1152, 864, 15384, 96, 16, 110, 1, 216, 10,
84 0, FB_VMODE_INTERLACED
85 }, {
86 /* 800x600 @ 72 Hz, 48.0 kHz hsync */
87 NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
88 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
89 }, {
90 /* 1024x768 @ 60 Hz, 48.4 kHz hsync */
91 NULL, 60, 1024, 768, 15384, 168, 8, 29, 3, 144, 6,
92 0, FB_VMODE_NONINTERLACED
93 }, {
94 /* 640x480 @ 100 Hz, 53.01 kHz hsync */
95 NULL, 100, 640, 480, 21834, 96, 32, 36, 8, 96, 6,
96 0, FB_VMODE_NONINTERLACED
97 }, {
98 /* 1152x864 @ 60 Hz, 53.5 kHz hsync */
99 NULL, 60, 1152, 864, 11123, 208, 64, 16, 4, 256, 8,
100 0, FB_VMODE_NONINTERLACED
101 }, {
102 /* 800x600 @ 85 Hz, 55.84 kHz hsync */
103 NULL, 85, 800, 600, 16460, 160, 64, 36, 16, 64, 5,
104 0, FB_VMODE_NONINTERLACED
105 }, {
106 /* 1024x768 @ 70 Hz, 56.5 kHz hsync */
107 NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6,
108 0, FB_VMODE_NONINTERLACED
109 }, {
110 /* 1280x1024 @ 87 Hz interlaced, 51 kHz hsync */
111 NULL, 87, 1280, 1024, 12500, 56, 16, 128, 1, 216, 12,
112 0, FB_VMODE_INTERLACED
113 }, {
114 /* 800x600 @ 100 Hz, 64.02 kHz hsync */
115 NULL, 100, 800, 600, 14357, 160, 64, 30, 4, 64, 6,
116 0, FB_VMODE_NONINTERLACED
117 }, {
118 /* 1024x768 @ 76 Hz, 62.5 kHz hsync */
119 NULL, 76, 1024, 768, 11764, 208, 8, 36, 16, 120, 3,
120 0, FB_VMODE_NONINTERLACED
121 }, {
122 /* 1152x864 @ 70 Hz, 62.4 kHz hsync */
123 NULL, 70, 1152, 864, 10869, 106, 56, 20, 1, 160, 10,
124 0, FB_VMODE_NONINTERLACED
125 }, {
126 /* 1280x1024 @ 61 Hz, 64.2 kHz hsync */
127 NULL, 61, 1280, 1024, 9090, 200, 48, 26, 1, 184, 3,
128 0, FB_VMODE_NONINTERLACED
129 }, {
130 /* 1024x768 @ 85 Hz, 70.24 kHz hsync */
131 NULL, 85, 1024, 768, 10111, 192, 32, 34, 14, 160, 6,
132 0, FB_VMODE_NONINTERLACED
133 }, {
134 /* 1152x864 @ 78 Hz, 70.8 kHz hsync */
135 NULL, 78, 1152, 864, 9090, 228, 88, 32, 0, 84, 12,
136 0, FB_VMODE_NONINTERLACED
137 }, {
138 /* 1280x1024 @ 70 Hz, 74.59 kHz hsync */
139 NULL, 70, 1280, 1024, 7905, 224, 32, 28, 8, 160, 8,
140 0, FB_VMODE_NONINTERLACED
141 }, {
142 /* 1600x1200 @ 60Hz, 75.00 kHz hsync */
143 NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
144 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
145 }, {
146 /* 1152x864 @ 84 Hz, 76.0 kHz hsync */
147 NULL, 84, 1152, 864, 7407, 184, 312, 32, 0, 128, 12,
148 0, FB_VMODE_NONINTERLACED
149 }, {
150 /* 1280x1024 @ 74 Hz, 78.85 kHz hsync */
151 NULL, 74, 1280, 1024, 7407, 256, 32, 34, 3, 144, 3,
152 0, FB_VMODE_NONINTERLACED
153 }, {
154 /* 1024x768 @ 100Hz, 80.21 kHz hsync */
155 NULL, 100, 1024, 768, 8658, 192, 32, 21, 3, 192, 10,
156 0, FB_VMODE_NONINTERLACED
157 }, {
158 /* 1280x1024 @ 76 Hz, 81.13 kHz hsync */
159 NULL, 76, 1280, 1024, 7407, 248, 32, 34, 3, 104, 3,
160 0, FB_VMODE_NONINTERLACED
161 }, {
162 /* 1600x1200 @ 70 Hz, 87.50 kHz hsync */
163 NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3,
164 0, FB_VMODE_NONINTERLACED
165 }, {
166 /* 1152x864 @ 100 Hz, 89.62 kHz hsync */
167 NULL, 100, 1152, 864, 7264, 224, 32, 17, 2, 128, 19,
168 0, FB_VMODE_NONINTERLACED
169 }, {
170 /* 1280x1024 @ 85 Hz, 91.15 kHz hsync */
171 NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
172 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
173 }, {
174 /* 1600x1200 @ 75 Hz, 93.75 kHz hsync */
175 NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
176 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
177 }, {
178 /* 1600x1200 @ 85 Hz, 105.77 kHz hsync */
179 NULL, 85, 1600, 1200, 4545, 272, 16, 37, 4, 192, 3,
180 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
181 }, {
182 /* 1280x1024 @ 100 Hz, 107.16 kHz hsync */
183 NULL, 100, 1280, 1024, 5502, 256, 32, 26, 7, 128, 15,
184 0, FB_VMODE_NONINTERLACED
185 }, {
186 /* 1800x1440 @ 64Hz, 96.15 kHz hsync */
187 NULL, 64, 1800, 1440, 4347, 304, 96, 46, 1, 192, 3,
188 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
189 }, {
190 /* 1800x1440 @ 70Hz, 104.52 kHz hsync */
191 NULL, 70, 1800, 1440, 4000, 304, 96, 46, 1, 192, 3,
192 FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
193 }, {
194 /* 512x384 @ 78 Hz, 31.50 kHz hsync */
195 NULL, 78, 512, 384, 49603, 48, 16, 16, 1, 64, 3,
196 0, FB_VMODE_NONINTERLACED
197 }, {
198 /* 512x384 @ 85 Hz, 34.38 kHz hsync */
199 NULL, 85, 512, 384, 45454, 48, 16, 16, 1, 64, 3,
200 0, FB_VMODE_NONINTERLACED
201 }, {
202 /* 320x200 @ 70 Hz, 31.5 kHz hsync, 8:5 aspect ratio */
203 NULL, 70, 320, 200, 79440, 16, 16, 20, 4, 48, 1,
204 0, FB_VMODE_DOUBLE
205 }, {
206 /* 320x240 @ 60 Hz, 31.5 kHz hsync, 4:3 aspect ratio */
207 NULL, 60, 320, 240, 79440, 16, 16, 16, 5, 48, 1,
208 0, FB_VMODE_DOUBLE
209 }, {
210 /* 320x240 @ 72 Hz, 36.5 kHz hsync */
211 NULL, 72, 320, 240, 63492, 16, 16, 16, 4, 48, 2,
212 0, FB_VMODE_DOUBLE
213 }, {
214 /* 400x300 @ 56 Hz, 35.2 kHz hsync, 4:3 aspect ratio */
215 NULL, 56, 400, 300, 55555, 64, 16, 10, 1, 32, 1,
216 0, FB_VMODE_DOUBLE
217 }, {
218 /* 400x300 @ 60 Hz, 37.8 kHz hsync */
219 NULL, 60, 400, 300, 50000, 48, 16, 11, 1, 64, 2,
220 0, FB_VMODE_DOUBLE
221 }, {
222 /* 400x300 @ 72 Hz, 48.0 kHz hsync */
223 NULL, 72, 400, 300, 40000, 32, 24, 11, 19, 64, 3,
224 0, FB_VMODE_DOUBLE
225 }, {
226 /* 480x300 @ 56 Hz, 35.2 kHz hsync, 8:5 aspect ratio */
227 NULL, 56, 480, 300, 46176, 80, 16, 10, 1, 40, 1,
228 0, FB_VMODE_DOUBLE
229 }, {
230 /* 480x300 @ 60 Hz, 37.8 kHz hsync */
231 NULL, 60, 480, 300, 41858, 56, 16, 11, 1, 80, 2,
232 0, FB_VMODE_DOUBLE
233 }, {
234 /* 480x300 @ 63 Hz, 39.6 kHz hsync */
235 NULL, 63, 480, 300, 40000, 56, 16, 11, 1, 80, 2,
236 0, FB_VMODE_DOUBLE
237 }, {
238 /* 480x300 @ 72 Hz, 48.0 kHz hsync */
239 NULL, 72, 480, 300, 33386, 40, 24, 11, 19, 80, 3,
240 0, FB_VMODE_DOUBLE
241 },
242 };
243
244
245 static int __init my_atoi(const char *name)
246 {
247 int val = 0;
248
249 for (;; name++) {
250 switch (*name) {
251 case '0'...'9':
252 val = 10*val+(*name-'0');
253 break;
254 default:
255 return val;
256 }
257 }
258 }
259
260 static int PROC_CONSOLE(const struct fb_info *info)
261 {
262 int fgc;
263
264 if (info->display_fg != NULL)
265 fgc = info->display_fg->vc_num;
266 else
267 return -1;
268
269 if (!current->tty)
270 return fgc;
271
272 if (current->tty->driver.type != TTY_DRIVER_TYPE_CONSOLE)
273 /* XXX Should report error here? */
274 return fgc;
275
276 if (MINOR(current->tty->device) < 1)
277 return fgc;
278
279 return MINOR(current->tty->device) - 1;
280 }
281
282
283 /**
284 * __fb_try_mode - test a video mode
285 * @var: frame buffer user defined part of display
286 * @info: frame buffer info structure
287 * @mode: frame buffer video mode structure
288 * @bpp: color depth in bits per pixel
289 *
290 * Tries a video mode to test it's validity for device @info.
291 *
292 * Returns 1 on success.
293 *
294 */
295
296 int __fb_try_mode(struct fb_var_screeninfo *var, struct fb_info *info,
297 const struct fb_videomode *mode, unsigned int bpp)
298 {
299 int err;
300
301 DPRINTK("Trying mode %s %dx%d-%d@%d\n", mode->name ? mode->name : "noname",
302 mode->xres, mode->yres, bpp, mode->refresh);
303 var->xres = mode->xres;
304 var->yres = mode->yres;
305 var->xres_virtual = mode->xres;
306 var->yres_virtual = mode->yres;
307 var->xoffset = 0;
308 var->yoffset = 0;
309 var->bits_per_pixel = bpp;
310 var->activate |= FB_ACTIVATE_TEST;
311 var->pixclock = mode->pixclock;
312 var->left_margin = mode->left_margin;
313 var->right_margin = mode->right_margin;
314 var->upper_margin = mode->upper_margin;
315 var->lower_margin = mode->lower_margin;
316 var->hsync_len = mode->hsync_len;
317 var->vsync_len = mode->vsync_len;
318 var->sync = mode->sync;
319 var->vmode = mode->vmode;
320 err = info->fbops->fb_set_var(var, PROC_CONSOLE(info), info);
321 var->activate &= ~FB_ACTIVATE_TEST;
322 return !err;
323 }
324
325
326 /**
327 * fb_find_mode - finds a valid video mode
328 * @var: frame buffer user defined part of display
329 * @info: frame buffer info structure
330 * @mode_option: string video mode to find
331 * @db: video mode database
332 * @dbsize: size of @db
333 * @default_mode: default video mode to fall back to
334 * @default_bpp: default color depth in bits per pixel
335 *
336 * Finds a suitable video mode, starting with the specified mode
337 * in @mode_option with fallback to @default_mode. If
338 * @default_mode fails, all modes in the video mode database will
339 * be tried.
340 *
341 * Valid mode specifiers for @mode_option:
342 *
343 * <xres>x<yres>[-<bpp>][@<refresh>] or
344 * <name>[-<bpp>][@<refresh>]
345 *
346 * with <xres>, <yres>, <bpp> and <refresh> decimal numbers and
347 * <name> a string.
348 *
349 * NOTE: The passed struct @var is _not_ cleared! This allows you
350 * to supply values for e.g. the grayscale and accel_flags fields.
351 *
352 * Returns zero for failure, 1 if using specified @mode_option,
353 * 2 if using specified @mode_option with an ignored refresh rate,
354 * 3 if default mode is used, 4 if fall back to any valid mode.
355 *
356 */
357
358 int __init fb_find_mode(struct fb_var_screeninfo *var,
359 struct fb_info *info, const char *mode_option,
360 const struct fb_videomode *db, unsigned int dbsize,
361 const struct fb_videomode *default_mode,
362 unsigned int default_bpp)
363 {
364 int i, j;
365
366 /* Set up defaults */
367 if (!db) {
368 db = modedb;
369 dbsize = sizeof(modedb)/sizeof(*modedb);
370 }
371 if (!default_mode)
372 default_mode = &modedb[DEFAULT_MODEDB_INDEX];
373 if (!default_bpp)
374 default_bpp = 8;
375
376 /* Did the user specify a video mode? */
377 if (mode_option || (mode_option = global_mode_option)) {
378 const char *name = mode_option;
379 unsigned int namelen = strlen(name);
380 int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
381 unsigned int xres = 0, yres = 0, bpp = default_bpp, refresh = 0;
382 int yres_specified = 0;
383
384 for (i = namelen-1; i >= 0; i--) {
385 switch (name[i]) {
386 case '@':
387 namelen = i;
388 if (!refresh_specified && !bpp_specified &&
389 !yres_specified) {
390 refresh = my_atoi(&name[i+1]);
391 refresh_specified = 1;
392 } else
393 goto done;
394 break;
395 case '-':
396 namelen = i;
397 if (!bpp_specified && !yres_specified) {
398 bpp = my_atoi(&name[i+1]);
399 bpp_specified = 1;
400 } else
401 goto done;
402 break;
403 case 'x':
404 if (!yres_specified) {
405 yres = my_atoi(&name[i+1]);
406 yres_specified = 1;
407 } else
408 goto done;
409 break;
410 case '0'...'9':
411 break;
412 default:
413 goto done;
414 }
415 }
416 if (i < 0 && yres_specified) {
417 xres = my_atoi(name);
418 res_specified = 1;
419 }
420 done:
421 for (i = refresh_specified; i >= 0; i--) {
422 DPRINTK("Trying specified video mode%s\n",
423 i ? "" : " (ignoring refresh rate)");
424 for (j = 0; j < dbsize; j++)
425 if ((name_matches(db[j], name, namelen) ||
426 (res_specified && res_matches(db[j], xres, yres))) &&
427 (!i || db[j].refresh == refresh) &&
428 __fb_try_mode(var, info, &db[j], bpp))
429 return 2-i;
430 }
431 }
432
433 DPRINTK("Trying default video mode\n");
434 if (__fb_try_mode(var, info, default_mode, default_bpp))
435 return 3;
436
437 DPRINTK("Trying all modes\n");
438 for (i = 0; i < dbsize; i++)
439 if (__fb_try_mode(var, info, &db[i], default_bpp))
440 return 4;
441
442 DPRINTK("No valid mode found\n");
443 return 0;
444 }
445
446 EXPORT_SYMBOL(__fb_try_mode);
447