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[NETFILTER]: conntrack: fix {nf,ip}_ct_iterate_cleanup endless loops
[linux-2.6.22.y-op.git] / drivers / video / fbmon.c
blob6b385c39b8b5cdc13b0ec781c72067aed810ef78
1 /*
2 * linux/drivers/video/fbmon.c
3 *
4 * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net>
5 *
6 * Credits:
7 *
8 * The EDID Parser is a conglomeration from the following sources:
9 *
10 * 1. SciTech SNAP Graphics Architecture
11 * Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved.
12 *
13 * 2. XFree86 4.3.0, interpret_edid.c
14 * Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
15 *
16 * 3. John Fremlin <vii@users.sourceforge.net> and
17 * Ani Joshi <ajoshi@unixbox.com>
18 *
19 * Generalized Timing Formula is derived from:
20 *
21 * GTF Spreadsheet by Andy Morrish (1/5/97)
22 * available at http://www.vesa.org
23 *
24 * This file is subject to the terms and conditions of the GNU General Public
25 * License. See the file COPYING in the main directory of this archive
26 * for more details.
27 *
28 */
29 #include <linux/fb.h>
30 #include <linux/module.h>
31 #include <linux/pci.h>
32 #include <video/edid.h>
33 #ifdef CONFIG_PPC_OF
34 #include <asm/prom.h>
35 #include <asm/pci-bridge.h>
36 #endif
37 #include "edid.h"
38
39 /*
40 * EDID parser
41 */
42
43 #undef DEBUG /* define this for verbose EDID parsing output */
44
45 #ifdef DEBUG
46 #define DPRINTK(fmt, args...) printk(fmt,## args)
47 #else
48 #define DPRINTK(fmt, args...)
49 #endif
50
51 #define FBMON_FIX_HEADER 1
52 #define FBMON_FIX_INPUT 2
53
54 #ifdef CONFIG_FB_MODE_HELPERS
55 struct broken_edid {
56 u8 manufacturer[4];
57 u32 model;
58 u32 fix;
59 };
60
61 static const struct broken_edid brokendb[] = {
62 /* DEC FR-PCXAV-YZ */
63 {
64 .manufacturer = "DEC",
65 .model = 0x073a,
66 .fix = FBMON_FIX_HEADER,
67 },
68 /* ViewSonic PF775a */
69 {
70 .manufacturer = "VSC",
71 .model = 0x5a44,
72 .fix = FBMON_FIX_INPUT,
73 },
74 };
75
76 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
77 0xff, 0xff, 0xff, 0x00
78 };
79
80 static void copy_string(unsigned char *c, unsigned char *s)
81 {
82 int i;
83 c = c + 5;
84 for (i = 0; (i < 13 && *c != 0x0A); i++)
85 *(s++) = *(c++);
86 *s = 0;
87 while (i-- && (*--s == 0x20)) *s = 0;
88 }
89
90 static int check_edid(unsigned char *edid)
91 {
92 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
93 unsigned char *b;
94 u32 model;
95 int i, fix = 0, ret = 0;
96
97 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
98 manufacturer[1] = ((block[0] & 0x03) << 3) +
99 ((block[1] & 0xe0) >> 5) + '@';
100 manufacturer[2] = (block[1] & 0x1f) + '@';
101 manufacturer[3] = 0;
102 model = block[2] + (block[3] << 8);
103
104 for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
105 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
106 brokendb[i].model == model) {
107 printk("fbmon: The EDID Block of "
108 "Manufacturer: %s Model: 0x%x is known to "
109 "be broken,\n", manufacturer, model);
110 fix = brokendb[i].fix;
111 break;
112 }
113 }
114
115 switch (fix) {
116 case FBMON_FIX_HEADER:
117 for (i = 0; i < 8; i++) {
118 if (edid[i] != edid_v1_header[i])
119 ret = fix;
120 }
121 break;
122 case FBMON_FIX_INPUT:
123 b = edid + EDID_STRUCT_DISPLAY;
124 /* Only if display is GTF capable will
125 the input type be reset to analog */
126 if (b[4] & 0x01 && b[0] & 0x80)
127 ret = fix;
128 break;
129 }
130
131 return ret;
132 }
133
134 static void fix_edid(unsigned char *edid, int fix)
135 {
136 unsigned char *b;
137
138 switch (fix) {
139 case FBMON_FIX_HEADER:
140 printk("fbmon: trying a header reconstruct\n");
141 memcpy(edid, edid_v1_header, 8);
142 break;
143 case FBMON_FIX_INPUT:
144 printk("fbmon: trying to fix input type\n");
145 b = edid + EDID_STRUCT_DISPLAY;
146 b[0] &= ~0x80;
147 edid[127] += 0x80;
148 }
149 }
150
151 static int edid_checksum(unsigned char *edid)
152 {
153 unsigned char i, csum = 0, all_null = 0;
154 int err = 0, fix = check_edid(edid);
155
156 if (fix)
157 fix_edid(edid, fix);
158
159 for (i = 0; i < EDID_LENGTH; i++) {
160 csum += edid[i];
161 all_null |= edid[i];
162 }
163
164 if (csum == 0x00 && all_null) {
165 /* checksum passed, everything's good */
166 err = 1;
167 }
168
169 return err;
170 }
171
172 static int edid_check_header(unsigned char *edid)
173 {
174 int i, err = 1, fix = check_edid(edid);
175
176 if (fix)
177 fix_edid(edid, fix);
178
179 for (i = 0; i < 8; i++) {
180 if (edid[i] != edid_v1_header[i])
181 err = 0;
182 }
183
184 return err;
185 }
186
187 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
188 {
189 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
190 specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
191 ((block[1] & 0xe0) >> 5) + '@';
192 specs->manufacturer[2] = (block[1] & 0x1f) + '@';
193 specs->manufacturer[3] = 0;
194 specs->model = block[2] + (block[3] << 8);
195 specs->serial = block[4] + (block[5] << 8) +
196 (block[6] << 16) + (block[7] << 24);
197 specs->year = block[9] + 1990;
198 specs->week = block[8];
199 DPRINTK(" Manufacturer: %s\n", specs->manufacturer);
200 DPRINTK(" Model: %x\n", specs->model);
201 DPRINTK(" Serial#: %u\n", specs->serial);
202 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);
203 }
204
205 static void get_dpms_capabilities(unsigned char flags,
206 struct fb_monspecs *specs)
207 {
208 specs->dpms = 0;
209 if (flags & DPMS_ACTIVE_OFF)
210 specs->dpms |= FB_DPMS_ACTIVE_OFF;
211 if (flags & DPMS_SUSPEND)
212 specs->dpms |= FB_DPMS_SUSPEND;
213 if (flags & DPMS_STANDBY)
214 specs->dpms |= FB_DPMS_STANDBY;
215 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",
216 (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
217 (flags & DPMS_SUSPEND) ? "yes" : "no",
218 (flags & DPMS_STANDBY) ? "yes" : "no");
219 }
220
221 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
222 {
223 int tmp;
224
225 DPRINTK(" Chroma\n");
226 /* Chromaticity data */
227 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
228 tmp *= 1000;
229 tmp += 512;
230 specs->chroma.redx = tmp/1024;
231 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
232
233 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
234 tmp *= 1000;
235 tmp += 512;
236 specs->chroma.redy = tmp/1024;
237 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
238
239 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
240 tmp *= 1000;
241 tmp += 512;
242 specs->chroma.greenx = tmp/1024;
243 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
244
245 tmp = (block[5] & 3) | (block[0xa] << 2);
246 tmp *= 1000;
247 tmp += 512;
248 specs->chroma.greeny = tmp/1024;
249 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
250
251 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
252 tmp *= 1000;
253 tmp += 512;
254 specs->chroma.bluex = tmp/1024;
255 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
256
257 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
258 tmp *= 1000;
259 tmp += 512;
260 specs->chroma.bluey = tmp/1024;
261 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
262
263 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
264 tmp *= 1000;
265 tmp += 512;
266 specs->chroma.whitex = tmp/1024;
267 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
268
269 tmp = (block[6] & 3) | (block[0xe] << 2);
270 tmp *= 1000;
271 tmp += 512;
272 specs->chroma.whitey = tmp/1024;
273 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
274 }
275
276 static int edid_is_serial_block(unsigned char *block)
277 {
278 if ((block[0] == 0x00) && (block[1] == 0x00) &&
279 (block[2] == 0x00) && (block[3] == 0xff) &&
280 (block[4] == 0x00))
281 return 1;
282 else
283 return 0;
284 }
285
286 static int edid_is_ascii_block(unsigned char *block)
287 {
288 if ((block[0] == 0x00) && (block[1] == 0x00) &&
289 (block[2] == 0x00) && (block[3] == 0xfe) &&
290 (block[4] == 0x00))
291 return 1;
292 else
293 return 0;
294 }
295
296 static int edid_is_limits_block(unsigned char *block)
297 {
298 if ((block[0] == 0x00) && (block[1] == 0x00) &&
299 (block[2] == 0x00) && (block[3] == 0xfd) &&
300 (block[4] == 0x00))
301 return 1;
302 else
303 return 0;
304 }
305
306 static int edid_is_monitor_block(unsigned char *block)
307 {
308 if ((block[0] == 0x00) && (block[1] == 0x00) &&
309 (block[2] == 0x00) && (block[3] == 0xfc) &&
310 (block[4] == 0x00))
311 return 1;
312 else
313 return 0;
314 }
315
316 static void calc_mode_timings(int xres, int yres, int refresh,
317 struct fb_videomode *mode)
318 {
319 struct fb_var_screeninfo *var;
320
321 var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
322
323 if (var) {
324 var->xres = xres;
325 var->yres = yres;
326 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
327 refresh, var, NULL);
328 mode->xres = xres;
329 mode->yres = yres;
330 mode->pixclock = var->pixclock;
331 mode->refresh = refresh;
332 mode->left_margin = var->left_margin;
333 mode->right_margin = var->right_margin;
334 mode->upper_margin = var->upper_margin;
335 mode->lower_margin = var->lower_margin;
336 mode->hsync_len = var->hsync_len;
337 mode->vsync_len = var->vsync_len;
338 mode->vmode = 0;
339 mode->sync = 0;
340 kfree(var);
341 }
342 }
343
344 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
345 {
346 int num = 0;
347 unsigned char c;
348
349 c = block[0];
350 if (c&0x80) {
351 calc_mode_timings(720, 400, 70, &mode[num]);
352 mode[num++].flag = FB_MODE_IS_CALCULATED;
353 DPRINTK(" 720x400@70Hz\n");
354 }
355 if (c&0x40) {
356 calc_mode_timings(720, 400, 88, &mode[num]);
357 mode[num++].flag = FB_MODE_IS_CALCULATED;
358 DPRINTK(" 720x400@88Hz\n");
359 }
360 if (c&0x20) {
361 mode[num++] = vesa_modes[3];
362 DPRINTK(" 640x480@60Hz\n");
363 }
364 if (c&0x10) {
365 calc_mode_timings(640, 480, 67, &mode[num]);
366 mode[num++].flag = FB_MODE_IS_CALCULATED;
367 DPRINTK(" 640x480@67Hz\n");
368 }
369 if (c&0x08) {
370 mode[num++] = vesa_modes[4];
371 DPRINTK(" 640x480@72Hz\n");
372 }
373 if (c&0x04) {
374 mode[num++] = vesa_modes[5];
375 DPRINTK(" 640x480@75Hz\n");
376 }
377 if (c&0x02) {
378 mode[num++] = vesa_modes[7];
379 DPRINTK(" 800x600@56Hz\n");
380 }
381 if (c&0x01) {
382 mode[num++] = vesa_modes[8];
383 DPRINTK(" 800x600@60Hz\n");
384 }
385
386 c = block[1];
387 if (c&0x80) {
388 mode[num++] = vesa_modes[9];
389 DPRINTK(" 800x600@72Hz\n");
390 }
391 if (c&0x40) {
392 mode[num++] = vesa_modes[10];
393 DPRINTK(" 800x600@75Hz\n");
394 }
395 if (c&0x20) {
396 calc_mode_timings(832, 624, 75, &mode[num]);
397 mode[num++].flag = FB_MODE_IS_CALCULATED;
398 DPRINTK(" 832x624@75Hz\n");
399 }
400 if (c&0x10) {
401 mode[num++] = vesa_modes[12];
402 DPRINTK(" 1024x768@87Hz Interlaced\n");
403 }
404 if (c&0x08) {
405 mode[num++] = vesa_modes[13];
406 DPRINTK(" 1024x768@60Hz\n");
407 }
408 if (c&0x04) {
409 mode[num++] = vesa_modes[14];
410 DPRINTK(" 1024x768@70Hz\n");
411 }
412 if (c&0x02) {
413 mode[num++] = vesa_modes[15];
414 DPRINTK(" 1024x768@75Hz\n");
415 }
416 if (c&0x01) {
417 mode[num++] = vesa_modes[21];
418 DPRINTK(" 1280x1024@75Hz\n");
419 }
420 c = block[2];
421 if (c&0x80) {
422 mode[num++] = vesa_modes[17];
423 DPRINTK(" 1152x870@75Hz\n");
424 }
425 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
426 return num;
427 }
428
429 static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
430 {
431 int xres, yres = 0, refresh, ratio, i;
432
433 xres = (block[0] + 31) * 8;
434 if (xres <= 256)
435 return 0;
436
437 ratio = (block[1] & 0xc0) >> 6;
438 switch (ratio) {
439 case 0:
440 yres = xres;
441 break;
442 case 1:
443 yres = (xres * 3)/4;
444 break;
445 case 2:
446 yres = (xres * 4)/5;
447 break;
448 case 3:
449 yres = (xres * 9)/16;
450 break;
451 }
452 refresh = (block[1] & 0x3f) + 60;
453
454 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
455 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
456 if (vesa_modes[i].xres == xres &&
457 vesa_modes[i].yres == yres &&
458 vesa_modes[i].refresh == refresh) {
459 *mode = vesa_modes[i];
460 mode->flag |= FB_MODE_IS_STANDARD;
461 return 1;
462 }
463 }
464 calc_mode_timings(xres, yres, refresh, mode);
465 return 1;
466 }
467
468 static int get_dst_timing(unsigned char *block,
469 struct fb_videomode *mode)
470 {
471 int j, num = 0;
472
473 for (j = 0; j < 6; j++, block+= STD_TIMING_DESCRIPTION_SIZE)
474 num += get_std_timing(block, &mode[num]);
475
476 return num;
477 }
478
479 static void get_detailed_timing(unsigned char *block,
480 struct fb_videomode *mode)
481 {
482 mode->xres = H_ACTIVE;
483 mode->yres = V_ACTIVE;
484 mode->pixclock = PIXEL_CLOCK;
485 mode->pixclock /= 1000;
486 mode->pixclock = KHZ2PICOS(mode->pixclock);
487 mode->right_margin = H_SYNC_OFFSET;
488 mode->left_margin = (H_ACTIVE + H_BLANKING) -
489 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
490 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
491 V_SYNC_WIDTH;
492 mode->lower_margin = V_SYNC_OFFSET;
493 mode->hsync_len = H_SYNC_WIDTH;
494 mode->vsync_len = V_SYNC_WIDTH;
495 if (HSYNC_POSITIVE)
496 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
497 if (VSYNC_POSITIVE)
498 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
499 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
500 (V_ACTIVE + V_BLANKING));
501 mode->vmode = 0;
502 mode->flag = FB_MODE_IS_DETAILED;
503
504 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
505 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
506 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
507 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
508 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
509 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
510 (VSYNC_POSITIVE) ? "+" : "-");
511 }
512
513 /**
514 * fb_create_modedb - create video mode database
515 * @edid: EDID data
516 * @dbsize: database size
517 *
518 * RETURNS: struct fb_videomode, @dbsize contains length of database
519 *
520 * DESCRIPTION:
521 * This function builds a mode database using the contents of the EDID
522 * data
523 */
524 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
525 {
526 struct fb_videomode *mode, *m;
527 unsigned char *block;
528 int num = 0, i;
529
530 mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
531 if (mode == NULL)
532 return NULL;
533
534 if (edid == NULL || !edid_checksum(edid) ||
535 !edid_check_header(edid)) {
536 kfree(mode);
537 return NULL;
538 }
539
540 *dbsize = 0;
541
542 DPRINTK(" Detailed Timings\n");
543 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
544 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
545 int first = 1;
546
547 if (!(block[0] == 0x00 && block[1] == 0x00)) {
548 get_detailed_timing(block, &mode[num]);
549 if (first) {
550 mode[num].flag |= FB_MODE_IS_FIRST;
551 first = 0;
552 }
553 num++;
554 }
555 }
556
557 DPRINTK(" Supported VESA Modes\n");
558 block = edid + ESTABLISHED_TIMING_1;
559 num += get_est_timing(block, &mode[num]);
560
561 DPRINTK(" Standard Timings\n");
562 block = edid + STD_TIMING_DESCRIPTIONS_START;
563 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
564 num += get_std_timing(block, &mode[num]);
565
566 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
567 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
568 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
569 num += get_dst_timing(block + 5, &mode[num]);
570 }
571
572 /* Yikes, EDID data is totally useless */
573 if (!num) {
574 kfree(mode);
575 return NULL;
576 }
577
578 *dbsize = num;
579 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
580 if (!m)
581 return mode;
582 memmove(m, mode, num * sizeof(struct fb_videomode));
583 kfree(mode);
584 return m;
585 }
586
587 /**
588 * fb_destroy_modedb - destroys mode database
589 * @modedb: mode database to destroy
590 *
591 * DESCRIPTION:
592 * Destroy mode database created by fb_create_modedb
593 */
594 void fb_destroy_modedb(struct fb_videomode *modedb)
595 {
596 kfree(modedb);
597 }
598
599 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
600 {
601 int i, retval = 1;
602 unsigned char *block;
603
604 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
605
606 DPRINTK(" Monitor Operating Limits: ");
607
608 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
609 if (edid_is_limits_block(block)) {
610 specs->hfmin = H_MIN_RATE * 1000;
611 specs->hfmax = H_MAX_RATE * 1000;
612 specs->vfmin = V_MIN_RATE;
613 specs->vfmax = V_MAX_RATE;
614 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
615 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
616 retval = 0;
617 DPRINTK("From EDID\n");
618 break;
619 }
620 }
621
622 /* estimate monitor limits based on modes supported */
623 if (retval) {
624 struct fb_videomode *modes, *mode;
625 int num_modes, i, hz, hscan, pixclock;
626 int vtotal, htotal;
627
628 modes = fb_create_modedb(edid, &num_modes);
629 if (!modes) {
630 DPRINTK("None Available\n");
631 return 1;
632 }
633
634 retval = 0;
635 for (i = 0; i < num_modes; i++) {
636 mode = &modes[i];
637 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
638 htotal = mode->xres + mode->right_margin + mode->hsync_len
639 + mode->left_margin;
640 vtotal = mode->yres + mode->lower_margin + mode->vsync_len
641 + mode->upper_margin;
642
643 if (mode->vmode & FB_VMODE_INTERLACED)
644 vtotal /= 2;
645
646 if (mode->vmode & FB_VMODE_DOUBLE)
647 vtotal *= 2;
648
649 hscan = (pixclock + htotal / 2) / htotal;
650 hscan = (hscan + 500) / 1000 * 1000;
651 hz = (hscan + vtotal / 2) / vtotal;
652
653 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
654 specs->dclkmax = pixclock;
655
656 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
657 specs->dclkmin = pixclock;
658
659 if (specs->hfmax == 0 || specs->hfmax < hscan)
660 specs->hfmax = hscan;
661
662 if (specs->hfmin == 0 || specs->hfmin > hscan)
663 specs->hfmin = hscan;
664
665 if (specs->vfmax == 0 || specs->vfmax < hz)
666 specs->vfmax = hz;
667
668 if (specs->vfmin == 0 || specs->vfmin > hz)
669 specs->vfmin = hz;
670 }
671 DPRINTK("Extrapolated\n");
672 fb_destroy_modedb(modes);
673 }
674 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
675 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
676 specs->vfmax, specs->dclkmax/1000000);
677 return retval;
678 }
679
680 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
681 {
682 unsigned char c, *block;
683
684 block = edid + EDID_STRUCT_DISPLAY;
685
686 fb_get_monitor_limits(edid, specs);
687
688 c = block[0] & 0x80;
689 specs->input = 0;
690 if (c) {
691 specs->input |= FB_DISP_DDI;
692 DPRINTK(" Digital Display Input");
693 } else {
694 DPRINTK(" Analog Display Input: Input Voltage - ");
695 switch ((block[0] & 0x60) >> 5) {
696 case 0:
697 DPRINTK("0.700V/0.300V");
698 specs->input |= FB_DISP_ANA_700_300;
699 break;
700 case 1:
701 DPRINTK("0.714V/0.286V");
702 specs->input |= FB_DISP_ANA_714_286;
703 break;
704 case 2:
705 DPRINTK("1.000V/0.400V");
706 specs->input |= FB_DISP_ANA_1000_400;
707 break;
708 case 3:
709 DPRINTK("0.700V/0.000V");
710 specs->input |= FB_DISP_ANA_700_000;
711 break;
712 }
713 }
714 DPRINTK("\n Sync: ");
715 c = block[0] & 0x10;
716 if (c)
717 DPRINTK(" Configurable signal level\n");
718 c = block[0] & 0x0f;
719 specs->signal = 0;
720 if (c & 0x10) {
721 DPRINTK("Blank to Blank ");
722 specs->signal |= FB_SIGNAL_BLANK_BLANK;
723 }
724 if (c & 0x08) {
725 DPRINTK("Separate ");
726 specs->signal |= FB_SIGNAL_SEPARATE;
727 }
728 if (c & 0x04) {
729 DPRINTK("Composite ");
730 specs->signal |= FB_SIGNAL_COMPOSITE;
731 }
732 if (c & 0x02) {
733 DPRINTK("Sync on Green ");
734 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
735 }
736 if (c & 0x01) {
737 DPRINTK("Serration on ");
738 specs->signal |= FB_SIGNAL_SERRATION_ON;
739 }
740 DPRINTK("\n");
741 specs->max_x = block[1];
742 specs->max_y = block[2];
743 DPRINTK(" Max H-size in cm: ");
744 if (specs->max_x)
745 DPRINTK("%d\n", specs->max_x);
746 else
747 DPRINTK("variable\n");
748 DPRINTK(" Max V-size in cm: ");
749 if (specs->max_y)
750 DPRINTK("%d\n", specs->max_y);
751 else
752 DPRINTK("variable\n");
753
754 c = block[3];
755 specs->gamma = c+100;
756 DPRINTK(" Gamma: ");
757 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
758
759 get_dpms_capabilities(block[4], specs);
760
761 switch ((block[4] & 0x18) >> 3) {
762 case 0:
763 DPRINTK(" Monochrome/Grayscale\n");
764 specs->input |= FB_DISP_MONO;
765 break;
766 case 1:
767 DPRINTK(" RGB Color Display\n");
768 specs->input |= FB_DISP_RGB;
769 break;
770 case 2:
771 DPRINTK(" Non-RGB Multicolor Display\n");
772 specs->input |= FB_DISP_MULTI;
773 break;
774 default:
775 DPRINTK(" Unknown\n");
776 specs->input |= FB_DISP_UNKNOWN;
777 break;
778 }
779
780 get_chroma(block, specs);
781
782 specs->misc = 0;
783 c = block[4] & 0x7;
784 if (c & 0x04) {
785 DPRINTK(" Default color format is primary\n");
786 specs->misc |= FB_MISC_PRIM_COLOR;
787 }
788 if (c & 0x02) {
789 DPRINTK(" First DETAILED Timing is preferred\n");
790 specs->misc |= FB_MISC_1ST_DETAIL;
791 }
792 if (c & 0x01) {
793 printk(" Display is GTF capable\n");
794 specs->gtf = 1;
795 }
796 }
797
798 static int edid_is_timing_block(unsigned char *block)
799 {
800 if ((block[0] != 0x00) || (block[1] != 0x00) ||
801 (block[2] != 0x00) || (block[4] != 0x00))
802 return 1;
803 else
804 return 0;
805 }
806
807 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
808 {
809 int i;
810 unsigned char *block;
811
812 if (edid == NULL || var == NULL)
813 return 1;
814
815 if (!(edid_checksum(edid)))
816 return 1;
817
818 if (!(edid_check_header(edid)))
819 return 1;
820
821 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
822
823 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
824 if (edid_is_timing_block(block)) {
825 var->xres = var->xres_virtual = H_ACTIVE;
826 var->yres = var->yres_virtual = V_ACTIVE;
827 var->height = var->width = -1;
828 var->right_margin = H_SYNC_OFFSET;
829 var->left_margin = (H_ACTIVE + H_BLANKING) -
830 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
831 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
832 V_SYNC_WIDTH;
833 var->lower_margin = V_SYNC_OFFSET;
834 var->hsync_len = H_SYNC_WIDTH;
835 var->vsync_len = V_SYNC_WIDTH;
836 var->pixclock = PIXEL_CLOCK;
837 var->pixclock /= 1000;
838 var->pixclock = KHZ2PICOS(var->pixclock);
839
840 if (HSYNC_POSITIVE)
841 var->sync |= FB_SYNC_HOR_HIGH_ACT;
842 if (VSYNC_POSITIVE)
843 var->sync |= FB_SYNC_VERT_HIGH_ACT;
844 return 0;
845 }
846 }
847 return 1;
848 }
849
850 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
851 {
852 unsigned char *block;
853 int i, found = 0;
854
855 if (edid == NULL)
856 return;
857
858 if (!(edid_checksum(edid)))
859 return;
860
861 if (!(edid_check_header(edid)))
862 return;
863
864 memset(specs, 0, sizeof(struct fb_monspecs));
865
866 specs->version = edid[EDID_STRUCT_VERSION];
867 specs->revision = edid[EDID_STRUCT_REVISION];
868
869 DPRINTK("========================================\n");
870 DPRINTK("Display Information (EDID)\n");
871 DPRINTK("========================================\n");
872 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
873 (int) specs->revision);
874
875 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
876
877 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
878 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
879 if (edid_is_serial_block(block)) {
880 copy_string(block, specs->serial_no);
881 DPRINTK(" Serial Number: %s\n", specs->serial_no);
882 } else if (edid_is_ascii_block(block)) {
883 copy_string(block, specs->ascii);
884 DPRINTK(" ASCII Block: %s\n", specs->ascii);
885 } else if (edid_is_monitor_block(block)) {
886 copy_string(block, specs->monitor);
887 DPRINTK(" Monitor Name: %s\n", specs->monitor);
888 }
889 }
890
891 DPRINTK(" Display Characteristics:\n");
892 get_monspecs(edid, specs);
893
894 specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
895
896 /*
897 * Workaround for buggy EDIDs that sets that the first
898 * detailed timing is preferred but has not detailed
899 * timing specified
900 */
901 for (i = 0; i < specs->modedb_len; i++) {
902 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
903 found = 1;
904 break;
905 }
906 }
907
908 if (!found)
909 specs->misc &= ~FB_MISC_1ST_DETAIL;
910
911 DPRINTK("========================================\n");
912 }
913
914 /*
915 * VESA Generalized Timing Formula (GTF)
916 */
917
918 #define FLYBACK 550
919 #define V_FRONTPORCH 1
920 #define H_OFFSET 40
921 #define H_SCALEFACTOR 20
922 #define H_BLANKSCALE 128
923 #define H_GRADIENT 600
924 #define C_VAL 30
925 #define M_VAL 300
926
927 struct __fb_timings {
928 u32 dclk;
929 u32 hfreq;
930 u32 vfreq;
931 u32 hactive;
932 u32 vactive;
933 u32 hblank;
934 u32 vblank;
935 u32 htotal;
936 u32 vtotal;
937 };
938
939 /**
940 * fb_get_vblank - get vertical blank time
941 * @hfreq: horizontal freq
942 *
943 * DESCRIPTION:
944 * vblank = right_margin + vsync_len + left_margin
945 *
946 * given: right_margin = 1 (V_FRONTPORCH)
947 * vsync_len = 3
948 * flyback = 550
949 *
950 * flyback * hfreq
951 * left_margin = --------------- - vsync_len
952 * 1000000
953 */
954 static u32 fb_get_vblank(u32 hfreq)
955 {
956 u32 vblank;
957
958 vblank = (hfreq * FLYBACK)/1000;
959 vblank = (vblank + 500)/1000;
960 return (vblank + V_FRONTPORCH);
961 }
962
963 /**
964 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
965 * @hfreq: horizontal freq
966 * @xres: horizontal resolution in pixels
967 *
968 * DESCRIPTION:
969 *
970 * xres * duty_cycle
971 * hblank = ------------------
972 * 100 - duty_cycle
973 *
974 * duty cycle = percent of htotal assigned to inactive display
975 * duty cycle = C - (M/Hfreq)
976 *
977 * where: C = ((offset - scale factor) * blank_scale)
978 * -------------------------------------- + scale factor
979 * 256
980 * M = blank_scale * gradient
981 *
982 */
983 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
984 {
985 u32 c_val, m_val, duty_cycle, hblank;
986
987 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
988 H_SCALEFACTOR) * 1000;
989 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
990 m_val = (m_val * 1000000)/hfreq;
991 duty_cycle = c_val - m_val;
992 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
993 return (hblank);
994 }
995
996 /**
997 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
998 * @dclk: pixelclock in Hz
999 * @xres: horizontal resolution in pixels
1000 *
1001 * DESCRIPTION:
1002 *
1003 * xres * duty_cycle
1004 * hblank = ------------------
1005 * 100 - duty_cycle
1006 *
1007 * duty cycle = percent of htotal assigned to inactive display
1008 * duty cycle = C - (M * h_period)
1009 *
1010 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
1011 * -----------------------------------------------
1012 * 2 * M
1013 * M = 300;
1014 * C = 30;
1015
1016 */
1017 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
1018 {
1019 u32 duty_cycle, h_period, hblank;
1020
1021 dclk /= 1000;
1022 h_period = 100 - C_VAL;
1023 h_period *= h_period;
1024 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1025 h_period *=10000;
1026
1027 h_period = int_sqrt(h_period);
1028 h_period -= (100 - C_VAL) * 100;
1029 h_period *= 1000;
1030 h_period /= 2 * M_VAL;
1031
1032 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1033 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1034 hblank &= ~15;
1035 return (hblank);
1036 }
1037
1038 /**
1039 * fb_get_hfreq - estimate hsync
1040 * @vfreq: vertical refresh rate
1041 * @yres: vertical resolution
1042 *
1043 * DESCRIPTION:
1044 *
1045 * (yres + front_port) * vfreq * 1000000
1046 * hfreq = -------------------------------------
1047 * (1000000 - (vfreq * FLYBACK)
1048 *
1049 */
1050
1051 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1052 {
1053 u32 divisor, hfreq;
1054
1055 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1056 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1057 return (hfreq/divisor);
1058 }
1059
1060 static void fb_timings_vfreq(struct __fb_timings *timings)
1061 {
1062 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1063 timings->vblank = fb_get_vblank(timings->hfreq);
1064 timings->vtotal = timings->vactive + timings->vblank;
1065 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1066 timings->hactive);
1067 timings->htotal = timings->hactive + timings->hblank;
1068 timings->dclk = timings->htotal * timings->hfreq;
1069 }
1070
1071 static void fb_timings_hfreq(struct __fb_timings *timings)
1072 {
1073 timings->vblank = fb_get_vblank(timings->hfreq);
1074 timings->vtotal = timings->vactive + timings->vblank;
1075 timings->vfreq = timings->hfreq/timings->vtotal;
1076 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1077 timings->hactive);
1078 timings->htotal = timings->hactive + timings->hblank;
1079 timings->dclk = timings->htotal * timings->hfreq;
1080 }
1081
1082 static void fb_timings_dclk(struct __fb_timings *timings)
1083 {
1084 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1085 timings->hactive);
1086 timings->htotal = timings->hactive + timings->hblank;
1087 timings->hfreq = timings->dclk/timings->htotal;
1088 timings->vblank = fb_get_vblank(timings->hfreq);
1089 timings->vtotal = timings->vactive + timings->vblank;
1090 timings->vfreq = timings->hfreq/timings->vtotal;
1091 }
1092
1093 /*
1094 * fb_get_mode - calculates video mode using VESA GTF
1095 * @flags: if: 0 - maximize vertical refresh rate
1096 * 1 - vrefresh-driven calculation;
1097 * 2 - hscan-driven calculation;
1098 * 3 - pixelclock-driven calculation;
1099 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1100 * @var: pointer to fb_var_screeninfo
1101 * @info: pointer to fb_info
1102 *
1103 * DESCRIPTION:
1104 * Calculates video mode based on monitor specs using VESA GTF.
1105 * The GTF is best for VESA GTF compliant monitors but is
1106 * specifically formulated to work for older monitors as well.
1107 *
1108 * If @flag==0, the function will attempt to maximize the
1109 * refresh rate. Otherwise, it will calculate timings based on
1110 * the flag and accompanying value.
1111 *
1112 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1113 * ignored and @var will be filled with the calculated timings.
1114 *
1115 * All calculations are based on the VESA GTF Spreadsheet
1116 * available at VESA's public ftp (http://www.vesa.org).
1117 *
1118 * NOTES:
1119 * The timings generated by the GTF will be different from VESA
1120 * DMT. It might be a good idea to keep a table of standard
1121 * VESA modes as well. The GTF may also not work for some displays,
1122 * such as, and especially, analog TV.
1123 *
1124 * REQUIRES:
1125 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1126 */
1127 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1128 {
1129 struct __fb_timings *timings;
1130 u32 interlace = 1, dscan = 1;
1131 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1132
1133
1134 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1135
1136 if (!timings)
1137 return -ENOMEM;
1138
1139 /*
1140 * If monspecs are invalid, use values that are enough
1141 * for 640x480@60
1142 */
1143 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1144 !info->monspecs.dclkmax ||
1145 info->monspecs.hfmax < info->monspecs.hfmin ||
1146 info->monspecs.vfmax < info->monspecs.vfmin ||
1147 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1148 hfmin = 29000; hfmax = 30000;
1149 vfmin = 60; vfmax = 60;
1150 dclkmin = 0; dclkmax = 25000000;
1151 } else {
1152 hfmin = info->monspecs.hfmin;
1153 hfmax = info->monspecs.hfmax;
1154 vfmin = info->monspecs.vfmin;
1155 vfmax = info->monspecs.vfmax;
1156 dclkmin = info->monspecs.dclkmin;
1157 dclkmax = info->monspecs.dclkmax;
1158 }
1159
1160 timings->hactive = var->xres;
1161 timings->vactive = var->yres;
1162 if (var->vmode & FB_VMODE_INTERLACED) {
1163 timings->vactive /= 2;
1164 interlace = 2;
1165 }
1166 if (var->vmode & FB_VMODE_DOUBLE) {
1167 timings->vactive *= 2;
1168 dscan = 2;
1169 }
1170
1171 switch (flags & ~FB_IGNOREMON) {
1172 case FB_MAXTIMINGS: /* maximize refresh rate */
1173 timings->hfreq = hfmax;
1174 fb_timings_hfreq(timings);
1175 if (timings->vfreq > vfmax) {
1176 timings->vfreq = vfmax;
1177 fb_timings_vfreq(timings);
1178 }
1179 if (timings->dclk > dclkmax) {
1180 timings->dclk = dclkmax;
1181 fb_timings_dclk(timings);
1182 }
1183 break;
1184 case FB_VSYNCTIMINGS: /* vrefresh driven */
1185 timings->vfreq = val;
1186 fb_timings_vfreq(timings);
1187 break;
1188 case FB_HSYNCTIMINGS: /* hsync driven */
1189 timings->hfreq = val;
1190 fb_timings_hfreq(timings);
1191 break;
1192 case FB_DCLKTIMINGS: /* pixelclock driven */
1193 timings->dclk = PICOS2KHZ(val) * 1000;
1194 fb_timings_dclk(timings);
1195 break;
1196 default:
1197 err = -EINVAL;
1198
1199 }
1200
1201 if (err || (!(flags & FB_IGNOREMON) &&
1202 (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1203 timings->hfreq < hfmin || timings->hfreq > hfmax ||
1204 timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1205 err = -EINVAL;
1206 } else {
1207 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1208 var->hsync_len = (timings->htotal * 8)/100;
1209 var->right_margin = (timings->hblank/2) - var->hsync_len;
1210 var->left_margin = timings->hblank - var->right_margin -
1211 var->hsync_len;
1212 var->vsync_len = (3 * interlace)/dscan;
1213 var->lower_margin = (1 * interlace)/dscan;
1214 var->upper_margin = (timings->vblank * interlace)/dscan -
1215 (var->vsync_len + var->lower_margin);
1216 }
1217
1218 kfree(timings);
1219 return err;
1220 }
1221 #else
1222 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1223 {
1224 return 1;
1225 }
1226 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1227 {
1228 specs = NULL;
1229 }
1230 void fb_destroy_modedb(struct fb_videomode *modedb)
1231 {
1232 }
1233 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1234 struct fb_info *info)
1235 {
1236 return -EINVAL;
1237 }
1238 #endif /* CONFIG_FB_MODE_HELPERS */
1239
1240 /*
1241 * fb_validate_mode - validates var against monitor capabilities
1242 * @var: pointer to fb_var_screeninfo
1243 * @info: pointer to fb_info
1244 *
1245 * DESCRIPTION:
1246 * Validates video mode against monitor capabilities specified in
1247 * info->monspecs.
1248 *
1249 * REQUIRES:
1250 * A valid info->monspecs.
1251 */
1252 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1253 {
1254 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1255 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1256
1257 /*
1258 * If monspecs are invalid, use values that are enough
1259 * for 640x480@60
1260 */
1261 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1262 !info->monspecs.dclkmax ||
1263 info->monspecs.hfmax < info->monspecs.hfmin ||
1264 info->monspecs.vfmax < info->monspecs.vfmin ||
1265 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1266 hfmin = 29000; hfmax = 30000;
1267 vfmin = 60; vfmax = 60;
1268 dclkmin = 0; dclkmax = 25000000;
1269 } else {
1270 hfmin = info->monspecs.hfmin;
1271 hfmax = info->monspecs.hfmax;
1272 vfmin = info->monspecs.vfmin;
1273 vfmax = info->monspecs.vfmax;
1274 dclkmin = info->monspecs.dclkmin;
1275 dclkmax = info->monspecs.dclkmax;
1276 }
1277
1278 if (!var->pixclock)
1279 return -EINVAL;
1280 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1281
1282 htotal = var->xres + var->right_margin + var->hsync_len +
1283 var->left_margin;
1284 vtotal = var->yres + var->lower_margin + var->vsync_len +
1285 var->upper_margin;
1286
1287 if (var->vmode & FB_VMODE_INTERLACED)
1288 vtotal /= 2;
1289 if (var->vmode & FB_VMODE_DOUBLE)
1290 vtotal *= 2;
1291
1292 hfreq = pixclock/htotal;
1293 hfreq = (hfreq + 500) / 1000 * 1000;
1294
1295 vfreq = hfreq/vtotal;
1296
1297 return (vfreq < vfmin || vfreq > vfmax ||
1298 hfreq < hfmin || hfreq > hfmax ||
1299 pixclock < dclkmin || pixclock > dclkmax) ?
1300 -EINVAL : 0;
1301 }
1302
1303 #if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
1304
1305 /*
1306 * We need to ensure that the EDID block is only returned for
1307 * the primary graphics adapter.
1308 */
1309
1310 const unsigned char *fb_firmware_edid(struct device *device)
1311 {
1312 struct pci_dev *dev = NULL;
1313 struct resource *res = NULL;
1314 unsigned char *edid = NULL;
1315
1316 if (device)
1317 dev = to_pci_dev(device);
1318
1319 if (dev)
1320 res = &dev->resource[PCI_ROM_RESOURCE];
1321
1322 if (res && res->flags & IORESOURCE_ROM_SHADOW)
1323 edid = edid_info.dummy;
1324
1325 return edid;
1326 }
1327 #else
1328 const unsigned char *fb_firmware_edid(struct device *device)
1329 {
1330 return NULL;
1331 }
1332 #endif
1333 EXPORT_SYMBOL(fb_firmware_edid);
1334
1335 EXPORT_SYMBOL(fb_parse_edid);
1336 EXPORT_SYMBOL(fb_edid_to_monspecs);
1337 EXPORT_SYMBOL(fb_get_mode);
1338 EXPORT_SYMBOL(fb_validate_mode);
1339 EXPORT_SYMBOL(fb_destroy_modedb);
linux v2.6.22.y-op