Merge branch 'master'
[linux-2.6] / drivers / video / fbmon.c
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/tty.h>
30 #include <linux/fb.h>
31 #include <linux/module.h>
32 #include <video/edid.h>
33 #ifdef CONFIG_PPC_OF
34 #include <linux/pci.h>
35 #include <asm/prom.h>
36 #include <asm/pci-bridge.h>
37 #endif
38 #include "edid.h"
39
40 /* 
41  * EDID parser
42  */
43
44 #undef DEBUG  /* define this for verbose EDID parsing output */
45
46 #ifdef DEBUG
47 #define DPRINTK(fmt, args...) printk(fmt,## args)
48 #else
49 #define DPRINTK(fmt, args...)
50 #endif
51
52 #define FBMON_FIX_HEADER 1
53 #define FBMON_FIX_INPUT  2
54
55 #ifdef CONFIG_FB_MODE_HELPERS
56 struct broken_edid {
57         u8  manufacturer[4];
58         u32 model;
59         u32 fix;
60 };
61
62 static struct broken_edid brokendb[] = {
63         /* DEC FR-PCXAV-YZ */
64         {
65                 .manufacturer = "DEC",
66                 .model        = 0x073a,
67                 .fix          = FBMON_FIX_HEADER,
68         },
69         /* ViewSonic PF775a */
70         {
71                 .manufacturer = "VSC",
72                 .model        = 0x5a44,
73                 .fix          = FBMON_FIX_INPUT,
74         },
75 };
76
77 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
78         0xff, 0xff, 0xff, 0x00
79 };
80
81 static void copy_string(unsigned char *c, unsigned char *s)
82 {
83   int i;
84   c = c + 5;
85   for (i = 0; (i < 13 && *c != 0x0A); i++)
86     *(s++) = *(c++);
87   *s = 0;
88   while (i-- && (*--s == 0x20)) *s = 0;
89 }
90
91 static int check_edid(unsigned char *edid)
92 {
93         unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
94         unsigned char *b;
95         u32 model;
96         int i, fix = 0, ret = 0;
97
98         manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
99         manufacturer[1] = ((block[0] & 0x03) << 3) +
100                 ((block[1] & 0xe0) >> 5) + '@';
101         manufacturer[2] = (block[1] & 0x1f) + '@';
102         manufacturer[3] = 0;
103         model = block[2] + (block[3] << 8);
104
105         for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
106                 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
107                         brokendb[i].model == model) {
108                         printk("fbmon: The EDID Block of "
109                                "Manufacturer: %s Model: 0x%x is known to "
110                                "be broken,\n",  manufacturer, model);
111                         fix = brokendb[i].fix;
112                         break;
113                 }
114         }
115
116         switch (fix) {
117         case FBMON_FIX_HEADER:
118                 for (i = 0; i < 8; i++) {
119                         if (edid[i] != edid_v1_header[i])
120                                 ret = fix;
121                 }
122                 break;
123         case FBMON_FIX_INPUT:
124                 b = edid + EDID_STRUCT_DISPLAY;
125                 /* Only if display is GTF capable will
126                    the input type be reset to analog */
127                 if (b[4] & 0x01 && b[0] & 0x80)
128                         ret = fix;
129                 break;
130         }
131
132         return ret;
133 }
134
135 static void fix_edid(unsigned char *edid, int fix)
136 {
137         unsigned char *b;
138
139         switch (fix) {
140         case FBMON_FIX_HEADER:
141                 printk("fbmon: trying a header reconstruct\n");
142                 memcpy(edid, edid_v1_header, 8);
143                 break;
144         case FBMON_FIX_INPUT:
145                 printk("fbmon: trying to fix input type\n");
146                 b = edid + EDID_STRUCT_DISPLAY;
147                 b[0] &= ~0x80;
148                 edid[127] += 0x80;
149         }
150 }
151
152 static int edid_checksum(unsigned char *edid)
153 {
154         unsigned char i, csum = 0, all_null = 0;
155         int err = 0, fix = check_edid(edid);
156
157         if (fix)
158                 fix_edid(edid, fix);
159
160         for (i = 0; i < EDID_LENGTH; i++) {
161                 csum += edid[i];
162                 all_null |= edid[i];
163         }
164
165         if (csum == 0x00 && all_null) {
166                 /* checksum passed, everything's good */
167                 err = 1;
168         }
169
170         return err;
171 }
172
173 static int edid_check_header(unsigned char *edid)
174 {
175         int i, err = 1, fix = check_edid(edid);
176
177         if (fix)
178                 fix_edid(edid, fix);
179
180         for (i = 0; i < 8; i++) {
181                 if (edid[i] != edid_v1_header[i])
182                         err = 0;
183         }
184
185         return err;
186 }
187
188 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
189 {
190         specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
191         specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
192                 ((block[1] & 0xe0) >> 5) + '@';
193         specs->manufacturer[2] = (block[1] & 0x1f) + '@';
194         specs->manufacturer[3] = 0;
195         specs->model = block[2] + (block[3] << 8);
196         specs->serial = block[4] + (block[5] << 8) +
197                (block[6] << 16) + (block[7] << 24);
198         specs->year = block[9] + 1990;
199         specs->week = block[8];
200         DPRINTK("   Manufacturer: %s\n", specs->manufacturer);
201         DPRINTK("   Model: %x\n", specs->model);
202         DPRINTK("   Serial#: %u\n", specs->serial);
203         DPRINTK("   Year: %u Week %u\n", specs->year, specs->week);
204 }
205
206 static void get_dpms_capabilities(unsigned char flags,
207                                   struct fb_monspecs *specs)
208 {
209         specs->dpms = 0;
210         if (flags & DPMS_ACTIVE_OFF)
211                 specs->dpms |= FB_DPMS_ACTIVE_OFF;
212         if (flags & DPMS_SUSPEND)
213                 specs->dpms |= FB_DPMS_SUSPEND;
214         if (flags & DPMS_STANDBY)
215                 specs->dpms |= FB_DPMS_STANDBY;
216         DPRINTK("      DPMS: Active %s, Suspend %s, Standby %s\n",
217                (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
218                (flags & DPMS_SUSPEND)    ? "yes" : "no",
219                (flags & DPMS_STANDBY)    ? "yes" : "no");
220 }
221         
222 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
223 {
224         int tmp;
225
226         DPRINTK("      Chroma\n");
227         /* Chromaticity data */
228         tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
229         tmp *= 1000;
230         tmp += 512;
231         specs->chroma.redx = tmp/1024;
232         DPRINTK("         RedX:     0.%03d ", specs->chroma.redx);
233
234         tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
235         tmp *= 1000;
236         tmp += 512;
237         specs->chroma.redy = tmp/1024;
238         DPRINTK("RedY:     0.%03d\n", specs->chroma.redy);
239
240         tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
241         tmp *= 1000;
242         tmp += 512;
243         specs->chroma.greenx = tmp/1024;
244         DPRINTK("         GreenX:   0.%03d ", specs->chroma.greenx);
245
246         tmp = (block[5] & 3) | (block[0xa] << 2);
247         tmp *= 1000;
248         tmp += 512;
249         specs->chroma.greeny = tmp/1024;
250         DPRINTK("GreenY:   0.%03d\n", specs->chroma.greeny);
251
252         tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
253         tmp *= 1000;
254         tmp += 512;
255         specs->chroma.bluex = tmp/1024;
256         DPRINTK("         BlueX:    0.%03d ", specs->chroma.bluex);
257
258         tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
259         tmp *= 1000;
260         tmp += 512;
261         specs->chroma.bluey = tmp/1024;
262         DPRINTK("BlueY:    0.%03d\n", specs->chroma.bluey);
263         
264         tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
265         tmp *= 1000;
266         tmp += 512;
267         specs->chroma.whitex = tmp/1024;
268         DPRINTK("         WhiteX:   0.%03d ", specs->chroma.whitex);
269
270         tmp = (block[6] & 3) | (block[0xe] << 2);
271         tmp *= 1000;
272         tmp += 512;
273         specs->chroma.whitey = tmp/1024;
274         DPRINTK("WhiteY:   0.%03d\n", specs->chroma.whitey);
275 }
276
277 static int edid_is_serial_block(unsigned char *block)
278 {
279         if ((block[0] == 0x00) && (block[1] == 0x00) && 
280             (block[2] == 0x00) && (block[3] == 0xff) &&
281             (block[4] == 0x00))
282                 return 1;
283         else
284                 return 0;
285 }
286
287 static int edid_is_ascii_block(unsigned char *block)
288 {
289         if ((block[0] == 0x00) && (block[1] == 0x00) && 
290             (block[2] == 0x00) && (block[3] == 0xfe) &&
291             (block[4] == 0x00))
292                 return 1;
293         else
294                 return 0;
295 }
296
297 static int edid_is_limits_block(unsigned char *block)
298 {
299         if ((block[0] == 0x00) && (block[1] == 0x00) && 
300             (block[2] == 0x00) && (block[3] == 0xfd) &&
301             (block[4] == 0x00))
302                 return 1;
303         else
304                 return 0;
305 }
306
307 static int edid_is_monitor_block(unsigned char *block)
308 {
309         if ((block[0] == 0x00) && (block[1] == 0x00) && 
310             (block[2] == 0x00) && (block[3] == 0xfc) &&
311             (block[4] == 0x00))
312                 return 1;
313         else
314                 return 0;
315 }
316
317 static void calc_mode_timings(int xres, int yres, int refresh,
318                               struct fb_videomode *mode)
319 {
320         struct fb_var_screeninfo var;
321         struct fb_info info;
322         
323         memset(&var, 0, sizeof(struct fb_var_screeninfo));
324         var.xres = xres;
325         var.yres = yres;
326         fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 
327                     refresh, &var, &info);
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 }
341
342 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
343 {
344         int num = 0;
345         unsigned char c;
346
347         c = block[0];
348         if (c&0x80) {
349                 calc_mode_timings(720, 400, 70, &mode[num]);
350                 mode[num++].flag = FB_MODE_IS_CALCULATED;
351                 DPRINTK("      720x400@70Hz\n");
352         }
353         if (c&0x40) {
354                 calc_mode_timings(720, 400, 88, &mode[num]);
355                 mode[num++].flag = FB_MODE_IS_CALCULATED;
356                 DPRINTK("      720x400@88Hz\n");
357         }
358         if (c&0x20) {
359                 mode[num++] = vesa_modes[3];
360                 DPRINTK("      640x480@60Hz\n");
361         }
362         if (c&0x10) {
363                 calc_mode_timings(640, 480, 67, &mode[num]);
364                 mode[num++].flag = FB_MODE_IS_CALCULATED;
365                 DPRINTK("      640x480@67Hz\n");
366         }
367         if (c&0x08) {
368                 mode[num++] = vesa_modes[4];
369                 DPRINTK("      640x480@72Hz\n");
370         }
371         if (c&0x04) {
372                 mode[num++] = vesa_modes[5];
373                 DPRINTK("      640x480@75Hz\n");
374         }
375         if (c&0x02) {
376                 mode[num++] = vesa_modes[7];
377                 DPRINTK("      800x600@56Hz\n");
378         }
379         if (c&0x01) {
380                 mode[num++] = vesa_modes[8];
381                 DPRINTK("      800x600@60Hz\n");
382         }
383
384         c = block[1];
385         if (c&0x80) {
386                 mode[num++] = vesa_modes[9];
387                 DPRINTK("      800x600@72Hz\n");
388         }
389         if (c&0x40) {
390                 mode[num++] = vesa_modes[10];
391                 DPRINTK("      800x600@75Hz\n");
392         }
393         if (c&0x20) {
394                 calc_mode_timings(832, 624, 75, &mode[num]);
395                 mode[num++].flag = FB_MODE_IS_CALCULATED;
396                 DPRINTK("      832x624@75Hz\n");
397         }
398         if (c&0x10) {
399                 mode[num++] = vesa_modes[12];
400                 DPRINTK("      1024x768@87Hz Interlaced\n");
401         }
402         if (c&0x08) {
403                 mode[num++] = vesa_modes[13];
404                 DPRINTK("      1024x768@60Hz\n");
405         }
406         if (c&0x04) {
407                 mode[num++] = vesa_modes[14];
408                 DPRINTK("      1024x768@70Hz\n");
409         }
410         if (c&0x02) {
411                 mode[num++] = vesa_modes[15];
412                 DPRINTK("      1024x768@75Hz\n");
413         }
414         if (c&0x01) {
415                 mode[num++] = vesa_modes[21];
416                 DPRINTK("      1280x1024@75Hz\n");
417         }
418         c = block[2];
419         if (c&0x80) {
420                 mode[num++] = vesa_modes[17];
421                 DPRINTK("      1152x870@75Hz\n");
422         }
423         DPRINTK("      Manufacturer's mask: %x\n",c&0x7F);
424         return num;
425 }
426
427 static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
428 {
429         int xres, yres = 0, refresh, ratio, i;
430         
431         xres = (block[0] + 31) * 8;
432         if (xres <= 256)
433                 return 0;
434
435         ratio = (block[1] & 0xc0) >> 6;
436         switch (ratio) {
437         case 0:
438                 yres = xres;
439                 break;
440         case 1:
441                 yres = (xres * 3)/4;
442                 break;
443         case 2:
444                 yres = (xres * 4)/5;
445                 break;
446         case 3:
447                 yres = (xres * 9)/16;
448                 break;
449         }
450         refresh = (block[1] & 0x3f) + 60;
451
452         DPRINTK("      %dx%d@%dHz\n", xres, yres, refresh);
453         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
454                 if (vesa_modes[i].xres == xres && 
455                     vesa_modes[i].yres == yres &&
456                     vesa_modes[i].refresh == refresh) {
457                         *mode = vesa_modes[i];
458                         mode->flag |= FB_MODE_IS_STANDARD;
459                         return 1;
460                 }
461         }
462         calc_mode_timings(xres, yres, refresh, mode);
463         return 1;
464 }
465
466 static int get_dst_timing(unsigned char *block,
467                           struct fb_videomode *mode)
468 {
469         int j, num = 0;
470
471         for (j = 0; j < 6; j++, block+= STD_TIMING_DESCRIPTION_SIZE) 
472                 num += get_std_timing(block, &mode[num]);
473
474         return num;
475 }
476
477 static void get_detailed_timing(unsigned char *block, 
478                                 struct fb_videomode *mode)
479 {
480         mode->xres = H_ACTIVE;
481         mode->yres = V_ACTIVE;
482         mode->pixclock = PIXEL_CLOCK;
483         mode->pixclock /= 1000;
484         mode->pixclock = KHZ2PICOS(mode->pixclock);
485         mode->right_margin = H_SYNC_OFFSET;
486         mode->left_margin = (H_ACTIVE + H_BLANKING) -
487                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
488         mode->upper_margin = V_BLANKING - V_SYNC_OFFSET - 
489                 V_SYNC_WIDTH;
490         mode->lower_margin = V_SYNC_OFFSET;
491         mode->hsync_len = H_SYNC_WIDTH;
492         mode->vsync_len = V_SYNC_WIDTH;
493         if (HSYNC_POSITIVE)
494                 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
495         if (VSYNC_POSITIVE)
496                 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
497         mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
498                                      (V_ACTIVE + V_BLANKING));
499         mode->vmode = 0;
500         mode->flag = FB_MODE_IS_DETAILED;
501
502         DPRINTK("      %d MHz ",  PIXEL_CLOCK/1000000);
503         DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
504                H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
505         DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
506                V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
507         DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
508                (VSYNC_POSITIVE) ? "+" : "-");
509 }
510
511 /**
512  * fb_create_modedb - create video mode database
513  * @edid: EDID data
514  * @dbsize: database size
515  *
516  * RETURNS: struct fb_videomode, @dbsize contains length of database
517  *
518  * DESCRIPTION:
519  * This function builds a mode database using the contents of the EDID
520  * data
521  */
522 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
523 {
524         struct fb_videomode *mode, *m;
525         unsigned char *block;
526         int num = 0, i;
527
528         mode = kmalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
529         if (mode == NULL)
530                 return NULL;
531         memset(mode, 0, 50 * sizeof(struct fb_videomode));
532
533         if (edid == NULL || !edid_checksum(edid) || 
534             !edid_check_header(edid)) {
535                 kfree(mode);
536                 return NULL;
537         }
538
539         *dbsize = 0;
540
541         DPRINTK("   Supported VESA Modes\n");
542         block = edid + ESTABLISHED_TIMING_1;
543         num += get_est_timing(block, &mode[num]);
544
545         DPRINTK("   Standard Timings\n");
546         block = edid + STD_TIMING_DESCRIPTIONS_START;
547         for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE) 
548                 num += get_std_timing(block, &mode[num]);
549
550         DPRINTK("   Detailed Timings\n");
551         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
552         for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
553                 int first = 1;
554
555                 if (block[0] == 0x00 && block[1] == 0x00) {
556                         if (block[3] == 0xfa) {
557                                 num += get_dst_timing(block + 5, &mode[num]);
558                         }
559                 } else  {
560                         get_detailed_timing(block, &mode[num]);
561                         if (first) {
562                                 mode[num].flag |= FB_MODE_IS_FIRST;
563                                 first = 0;
564                         }
565                         num++;
566                 }
567         }
568         
569         /* Yikes, EDID data is totally useless */
570         if (!num) {
571                 kfree(mode);
572                 return NULL;
573         }
574
575         *dbsize = num;
576         m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
577         if (!m)
578                 return mode;
579         memmove(m, mode, num * sizeof(struct fb_videomode));
580         kfree(mode);
581         return m;
582 }
583
584 /**
585  * fb_destroy_modedb - destroys mode database
586  * @modedb: mode database to destroy
587  *
588  * DESCRIPTION:
589  * Destroy mode database created by fb_create_modedb
590  */
591 void fb_destroy_modedb(struct fb_videomode *modedb)
592 {
593         kfree(modedb);
594 }
595
596 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
597 {
598         int i, retval = 1;
599         unsigned char *block;
600
601         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
602
603         DPRINTK("      Monitor Operating Limits: ");
604         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
605                 if (edid_is_limits_block(block)) {
606                         specs->hfmin = H_MIN_RATE * 1000;
607                         specs->hfmax = H_MAX_RATE * 1000;
608                         specs->vfmin = V_MIN_RATE;
609                         specs->vfmax = V_MAX_RATE;
610                         specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
611                         specs->gtf = (GTF_SUPPORT) ? 1 : 0;
612                         retval = 0;
613                         DPRINTK("From EDID\n");
614                         break;
615                 }
616         }
617         
618         /* estimate monitor limits based on modes supported */
619         if (retval) {
620                 struct fb_videomode *modes;
621                 int num_modes, i, hz, hscan, pixclock;
622
623                 modes = fb_create_modedb(edid, &num_modes);
624                 if (!modes) {
625                         DPRINTK("None Available\n");
626                         return 1;
627                 }
628
629                 retval = 0;
630                 for (i = 0; i < num_modes; i++) {
631                         hz = modes[i].refresh;
632                         pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
633                         hscan = (modes[i].yres * 105 * hz + 5000)/100;
634                         
635                         if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
636                                 specs->dclkmax = pixclock;
637                         if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
638                                 specs->dclkmin = pixclock;
639                         if (specs->hfmax == 0 || specs->hfmax < hscan)
640                                 specs->hfmax = hscan;
641                         if (specs->hfmin == 0 || specs->hfmin > hscan)
642                                 specs->hfmin = hscan;
643                         if (specs->vfmax == 0 || specs->vfmax < hz)
644                                 specs->vfmax = hz;
645                         if (specs->vfmin == 0 || specs->vfmin > hz)
646                                 specs->vfmin = hz;
647                 }
648                 DPRINTK("Extrapolated\n");
649                 fb_destroy_modedb(modes);
650         }
651         DPRINTK("           H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
652                 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
653                 specs->vfmax, specs->dclkmax/1000000);
654         return retval;
655 }
656
657 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
658 {
659         unsigned char c, *block;
660
661         block = edid + EDID_STRUCT_DISPLAY;
662
663         fb_get_monitor_limits(edid, specs);
664
665         c = block[0] & 0x80;
666         specs->input = 0;
667         if (c) {
668                 specs->input |= FB_DISP_DDI;
669                 DPRINTK("      Digital Display Input");
670         } else {
671                 DPRINTK("      Analog Display Input: Input Voltage - ");
672                 switch ((block[0] & 0x60) >> 5) {
673                 case 0:
674                         DPRINTK("0.700V/0.300V");
675                         specs->input |= FB_DISP_ANA_700_300;
676                         break;
677                 case 1:
678                         DPRINTK("0.714V/0.286V");
679                         specs->input |= FB_DISP_ANA_714_286;
680                         break;
681                 case 2:
682                         DPRINTK("1.000V/0.400V");
683                         specs->input |= FB_DISP_ANA_1000_400;
684                         break;
685                 case 3:
686                         DPRINTK("0.700V/0.000V");
687                         specs->input |= FB_DISP_ANA_700_000;
688                         break;
689                 }
690         }
691         DPRINTK("\n      Sync: ");
692         c = block[0] & 0x10;
693         if (c)
694                 DPRINTK("      Configurable signal level\n");
695         c = block[0] & 0x0f;
696         specs->signal = 0;
697         if (c & 0x10) {
698                 DPRINTK("Blank to Blank ");
699                 specs->signal |= FB_SIGNAL_BLANK_BLANK;
700         }
701         if (c & 0x08) {
702                 DPRINTK("Separate ");
703                 specs->signal |= FB_SIGNAL_SEPARATE;
704         }
705         if (c & 0x04) {
706                 DPRINTK("Composite ");
707                 specs->signal |= FB_SIGNAL_COMPOSITE;
708         }
709         if (c & 0x02) {
710                 DPRINTK("Sync on Green ");
711                 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
712         }
713         if (c & 0x01) {
714                 DPRINTK("Serration on ");
715                 specs->signal |= FB_SIGNAL_SERRATION_ON;
716         }
717         DPRINTK("\n");
718         specs->max_x = block[1];
719         specs->max_y = block[2];
720         DPRINTK("      Max H-size in cm: ");
721         if (specs->max_x)
722                 DPRINTK("%d\n", specs->max_x);
723         else
724                 DPRINTK("variable\n");
725         DPRINTK("      Max V-size in cm: ");
726         if (specs->max_y)
727                 DPRINTK("%d\n", specs->max_y);
728         else
729                 DPRINTK("variable\n");
730
731         c = block[3];
732         specs->gamma = c+100;
733         DPRINTK("      Gamma: ");
734         DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
735
736         get_dpms_capabilities(block[4], specs);
737
738         switch ((block[4] & 0x18) >> 3) {
739         case 0:
740                 DPRINTK("      Monochrome/Grayscale\n");
741                 specs->input |= FB_DISP_MONO;
742                 break;
743         case 1:
744                 DPRINTK("      RGB Color Display\n");
745                 specs->input |= FB_DISP_RGB;
746                 break;
747         case 2:
748                 DPRINTK("      Non-RGB Multicolor Display\n");
749                 specs->input |= FB_DISP_MULTI;
750                 break;
751         default:
752                 DPRINTK("      Unknown\n");
753                 specs->input |= FB_DISP_UNKNOWN;
754                 break;
755         }
756
757         get_chroma(block, specs);
758
759         specs->misc = 0;
760         c = block[4] & 0x7;
761         if (c & 0x04) {
762                 DPRINTK("      Default color format is primary\n");
763                 specs->misc |= FB_MISC_PRIM_COLOR;
764         }
765         if (c & 0x02) {
766                 DPRINTK("      First DETAILED Timing is preferred\n");
767                 specs->misc |= FB_MISC_1ST_DETAIL;
768         }
769         if (c & 0x01) {
770                 printk("      Display is GTF capable\n");
771                 specs->gtf = 1;
772         }
773 }
774
775 static int edid_is_timing_block(unsigned char *block)
776 {
777         if ((block[0] != 0x00) || (block[1] != 0x00) ||
778             (block[2] != 0x00) || (block[4] != 0x00))
779                 return 1;
780         else
781                 return 0;
782 }
783
784 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
785 {
786         int i;
787         unsigned char *block;
788
789         if (edid == NULL || var == NULL)
790                 return 1;
791
792         if (!(edid_checksum(edid)))
793                 return 1;
794
795         if (!(edid_check_header(edid)))
796                 return 1;
797
798         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
799
800         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
801                 if (edid_is_timing_block(block)) {
802                         var->xres = var->xres_virtual = H_ACTIVE;
803                         var->yres = var->yres_virtual = V_ACTIVE;
804                         var->height = var->width = -1;
805                         var->right_margin = H_SYNC_OFFSET;
806                         var->left_margin = (H_ACTIVE + H_BLANKING) -
807                                 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
808                         var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
809                                 V_SYNC_WIDTH;
810                         var->lower_margin = V_SYNC_OFFSET;
811                         var->hsync_len = H_SYNC_WIDTH;
812                         var->vsync_len = V_SYNC_WIDTH;
813                         var->pixclock = PIXEL_CLOCK;
814                         var->pixclock /= 1000;
815                         var->pixclock = KHZ2PICOS(var->pixclock);
816
817                         if (HSYNC_POSITIVE)
818                                 var->sync |= FB_SYNC_HOR_HIGH_ACT;
819                         if (VSYNC_POSITIVE)
820                                 var->sync |= FB_SYNC_VERT_HIGH_ACT;
821                         return 0;
822                 }
823         }
824         return 1;
825 }
826
827 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
828 {
829         unsigned char *block;
830         int i;
831
832         if (edid == NULL)
833                 return;
834
835         if (!(edid_checksum(edid)))
836                 return;
837
838         if (!(edid_check_header(edid)))
839                 return;
840
841         memset(specs, 0, sizeof(struct fb_monspecs));
842
843         specs->version = edid[EDID_STRUCT_VERSION];
844         specs->revision = edid[EDID_STRUCT_REVISION];
845
846         DPRINTK("========================================\n");
847         DPRINTK("Display Information (EDID)\n");
848         DPRINTK("========================================\n");
849         DPRINTK("   EDID Version %d.%d\n", (int) specs->version,
850                (int) specs->revision);
851
852         parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
853
854         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
855         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
856                 if (edid_is_serial_block(block)) {
857                         copy_string(block, specs->serial_no);
858                         DPRINTK("   Serial Number: %s\n", specs->serial_no);
859                 } else if (edid_is_ascii_block(block)) {
860                         copy_string(block, specs->ascii);
861                         DPRINTK("   ASCII Block: %s\n", specs->ascii);
862                 } else if (edid_is_monitor_block(block)) {
863                         copy_string(block, specs->monitor);
864                         DPRINTK("   Monitor Name: %s\n", specs->monitor);
865                 }
866         }
867
868         DPRINTK("   Display Characteristics:\n");
869         get_monspecs(edid, specs);
870
871         specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
872         DPRINTK("========================================\n");
873 }
874
875 /* 
876  * VESA Generalized Timing Formula (GTF) 
877  */
878
879 #define FLYBACK                     550
880 #define V_FRONTPORCH                1
881 #define H_OFFSET                    40
882 #define H_SCALEFACTOR               20
883 #define H_BLANKSCALE                128
884 #define H_GRADIENT                  600
885 #define C_VAL                       30
886 #define M_VAL                       300
887
888 struct __fb_timings {
889         u32 dclk;
890         u32 hfreq;
891         u32 vfreq;
892         u32 hactive;
893         u32 vactive;
894         u32 hblank;
895         u32 vblank;
896         u32 htotal;
897         u32 vtotal;
898 };
899
900 /**
901  * fb_get_vblank - get vertical blank time
902  * @hfreq: horizontal freq
903  *
904  * DESCRIPTION:
905  * vblank = right_margin + vsync_len + left_margin 
906  *
907  *    given: right_margin = 1 (V_FRONTPORCH)
908  *           vsync_len    = 3
909  *           flyback      = 550
910  *
911  *                          flyback * hfreq
912  *           left_margin  = --------------- - vsync_len
913  *                           1000000
914  */
915 static u32 fb_get_vblank(u32 hfreq)
916 {
917         u32 vblank;
918
919         vblank = (hfreq * FLYBACK)/1000; 
920         vblank = (vblank + 500)/1000;
921         return (vblank + V_FRONTPORCH);
922 }
923
924 /** 
925  * fb_get_hblank_by_freq - get horizontal blank time given hfreq
926  * @hfreq: horizontal freq
927  * @xres: horizontal resolution in pixels
928  *
929  * DESCRIPTION:
930  *
931  *           xres * duty_cycle
932  * hblank = ------------------
933  *           100 - duty_cycle
934  *
935  * duty cycle = percent of htotal assigned to inactive display
936  * duty cycle = C - (M/Hfreq)
937  *
938  * where: C = ((offset - scale factor) * blank_scale)
939  *            -------------------------------------- + scale factor
940  *                        256 
941  *        M = blank_scale * gradient
942  *
943  */
944 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
945 {
946         u32 c_val, m_val, duty_cycle, hblank;
947
948         c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 + 
949                  H_SCALEFACTOR) * 1000;
950         m_val = (H_BLANKSCALE * H_GRADIENT)/256;
951         m_val = (m_val * 1000000)/hfreq;
952         duty_cycle = c_val - m_val;
953         hblank = (xres * duty_cycle)/(100000 - duty_cycle);
954         return (hblank);
955 }
956
957 /** 
958  * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
959  * @dclk: pixelclock in Hz
960  * @xres: horizontal resolution in pixels
961  *
962  * DESCRIPTION:
963  *
964  *           xres * duty_cycle
965  * hblank = ------------------
966  *           100 - duty_cycle
967  *
968  * duty cycle = percent of htotal assigned to inactive display
969  * duty cycle = C - (M * h_period)
970  * 
971  * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
972  *                   -----------------------------------------------
973  *                                    2 * M
974  *        M = 300;
975  *        C = 30;
976
977  */
978 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
979 {
980         u32 duty_cycle, h_period, hblank;
981
982         dclk /= 1000;
983         h_period = 100 - C_VAL;
984         h_period *= h_period;
985         h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
986         h_period *=10000; 
987
988         h_period = int_sqrt(h_period);
989         h_period -= (100 - C_VAL) * 100;
990         h_period *= 1000; 
991         h_period /= 2 * M_VAL;
992
993         duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
994         hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
995         hblank &= ~15;
996         return (hblank);
997 }
998         
999 /**
1000  * fb_get_hfreq - estimate hsync
1001  * @vfreq: vertical refresh rate
1002  * @yres: vertical resolution
1003  *
1004  * DESCRIPTION:
1005  *
1006  *          (yres + front_port) * vfreq * 1000000
1007  * hfreq = -------------------------------------
1008  *          (1000000 - (vfreq * FLYBACK)
1009  * 
1010  */
1011
1012 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1013 {
1014         u32 divisor, hfreq;
1015         
1016         divisor = (1000000 - (vfreq * FLYBACK))/1000;
1017         hfreq = (yres + V_FRONTPORCH) * vfreq  * 1000;
1018         return (hfreq/divisor);
1019 }
1020
1021 static void fb_timings_vfreq(struct __fb_timings *timings)
1022 {
1023         timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1024         timings->vblank = fb_get_vblank(timings->hfreq);
1025         timings->vtotal = timings->vactive + timings->vblank;
1026         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, 
1027                                                  timings->hactive);
1028         timings->htotal = timings->hactive + timings->hblank;
1029         timings->dclk = timings->htotal * timings->hfreq;
1030 }
1031
1032 static void fb_timings_hfreq(struct __fb_timings *timings)
1033 {
1034         timings->vblank = fb_get_vblank(timings->hfreq);
1035         timings->vtotal = timings->vactive + timings->vblank;
1036         timings->vfreq = timings->hfreq/timings->vtotal;
1037         timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq, 
1038                                                  timings->hactive);
1039         timings->htotal = timings->hactive + timings->hblank;
1040         timings->dclk = timings->htotal * timings->hfreq;
1041 }
1042
1043 static void fb_timings_dclk(struct __fb_timings *timings)
1044 {
1045         timings->hblank = fb_get_hblank_by_dclk(timings->dclk, 
1046                                                 timings->hactive);
1047         timings->htotal = timings->hactive + timings->hblank;
1048         timings->hfreq = timings->dclk/timings->htotal;
1049         timings->vblank = fb_get_vblank(timings->hfreq);
1050         timings->vtotal = timings->vactive + timings->vblank;
1051         timings->vfreq = timings->hfreq/timings->vtotal;
1052 }
1053
1054 /*
1055  * fb_get_mode - calculates video mode using VESA GTF
1056  * @flags: if: 0 - maximize vertical refresh rate
1057  *             1 - vrefresh-driven calculation;
1058  *             2 - hscan-driven calculation;
1059  *             3 - pixelclock-driven calculation;
1060  * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1061  * @var: pointer to fb_var_screeninfo
1062  * @info: pointer to fb_info
1063  *
1064  * DESCRIPTION:
1065  * Calculates video mode based on monitor specs using VESA GTF. 
1066  * The GTF is best for VESA GTF compliant monitors but is 
1067  * specifically formulated to work for older monitors as well.
1068  *
1069  * If @flag==0, the function will attempt to maximize the 
1070  * refresh rate.  Otherwise, it will calculate timings based on
1071  * the flag and accompanying value.  
1072  *
1073  * If FB_IGNOREMON bit is set in @flags, monitor specs will be 
1074  * ignored and @var will be filled with the calculated timings.
1075  *
1076  * All calculations are based on the VESA GTF Spreadsheet
1077  * available at VESA's public ftp (http://www.vesa.org).
1078  * 
1079  * NOTES:
1080  * The timings generated by the GTF will be different from VESA
1081  * DMT.  It might be a good idea to keep a table of standard
1082  * VESA modes as well.  The GTF may also not work for some displays,
1083  * such as, and especially, analog TV.
1084  *   
1085  * REQUIRES:
1086  * A valid info->monspecs, otherwise 'safe numbers' will be used.
1087  */ 
1088 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1089 {
1090         struct __fb_timings timings;
1091         u32 interlace = 1, dscan = 1;
1092         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1093
1094         /* 
1095          * If monspecs are invalid, use values that are enough
1096          * for 640x480@60
1097          */
1098         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1099             !info->monspecs.dclkmax ||
1100             info->monspecs.hfmax < info->monspecs.hfmin ||
1101             info->monspecs.vfmax < info->monspecs.vfmin ||
1102             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1103                 hfmin = 29000; hfmax = 30000;
1104                 vfmin = 60; vfmax = 60;
1105                 dclkmin = 0; dclkmax = 25000000;
1106         } else {
1107                 hfmin = info->monspecs.hfmin;
1108                 hfmax = info->monspecs.hfmax;
1109                 vfmin = info->monspecs.vfmin;
1110                 vfmax = info->monspecs.vfmax;
1111                 dclkmin = info->monspecs.dclkmin;
1112                 dclkmax = info->monspecs.dclkmax;
1113         }
1114
1115         memset(&timings, 0, sizeof(struct __fb_timings));
1116         timings.hactive = var->xres;
1117         timings.vactive = var->yres;
1118         if (var->vmode & FB_VMODE_INTERLACED) { 
1119                 timings.vactive /= 2;
1120                 interlace = 2;
1121         }
1122         if (var->vmode & FB_VMODE_DOUBLE) {
1123                 timings.vactive *= 2;
1124                 dscan = 2;
1125         }
1126
1127         switch (flags & ~FB_IGNOREMON) {
1128         case FB_MAXTIMINGS: /* maximize refresh rate */
1129                 timings.hfreq = hfmax;
1130                 fb_timings_hfreq(&timings);
1131                 if (timings.vfreq > vfmax) {
1132                         timings.vfreq = vfmax;
1133                         fb_timings_vfreq(&timings);
1134                 }
1135                 if (timings.dclk > dclkmax) {
1136                         timings.dclk = dclkmax;
1137                         fb_timings_dclk(&timings);
1138                 }
1139                 break;
1140         case FB_VSYNCTIMINGS: /* vrefresh driven */
1141                 timings.vfreq = val;
1142                 fb_timings_vfreq(&timings);
1143                 break;
1144         case FB_HSYNCTIMINGS: /* hsync driven */
1145                 timings.hfreq = val;
1146                 fb_timings_hfreq(&timings);
1147                 break;
1148         case FB_DCLKTIMINGS: /* pixelclock driven */
1149                 timings.dclk = PICOS2KHZ(val) * 1000;
1150                 fb_timings_dclk(&timings);
1151                 break;
1152         default:
1153                 return -EINVAL;
1154                 
1155         } 
1156         
1157         if (!(flags & FB_IGNOREMON) && 
1158             (timings.vfreq < vfmin || timings.vfreq > vfmax || 
1159              timings.hfreq < hfmin || timings.hfreq > hfmax ||
1160              timings.dclk < dclkmin || timings.dclk > dclkmax))
1161                 return -EINVAL;
1162
1163         var->pixclock = KHZ2PICOS(timings.dclk/1000);
1164         var->hsync_len = (timings.htotal * 8)/100;
1165         var->right_margin = (timings.hblank/2) - var->hsync_len;
1166         var->left_margin = timings.hblank - var->right_margin - var->hsync_len;
1167         
1168         var->vsync_len = (3 * interlace)/dscan;
1169         var->lower_margin = (1 * interlace)/dscan;
1170         var->upper_margin = (timings.vblank * interlace)/dscan - 
1171                 (var->vsync_len + var->lower_margin);
1172         
1173         return 0;
1174 }
1175 #else
1176 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1177 {
1178         return 1;
1179 }
1180 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1181 {
1182         specs = NULL;
1183 }
1184 void fb_destroy_modedb(struct fb_videomode *modedb)
1185 {
1186 }
1187 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1188                 struct fb_info *info)
1189 {
1190         return -EINVAL;
1191 }
1192 #endif /* CONFIG_FB_MODE_HELPERS */
1193         
1194 /*
1195  * fb_validate_mode - validates var against monitor capabilities
1196  * @var: pointer to fb_var_screeninfo
1197  * @info: pointer to fb_info
1198  *
1199  * DESCRIPTION:
1200  * Validates video mode against monitor capabilities specified in
1201  * info->monspecs.
1202  *
1203  * REQUIRES:
1204  * A valid info->monspecs.
1205  */
1206 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1207 {
1208         u32 hfreq, vfreq, htotal, vtotal, pixclock;
1209         u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1210
1211         /* 
1212          * If monspecs are invalid, use values that are enough
1213          * for 640x480@60
1214          */
1215         if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1216             !info->monspecs.dclkmax ||
1217             info->monspecs.hfmax < info->monspecs.hfmin ||
1218             info->monspecs.vfmax < info->monspecs.vfmin ||
1219             info->monspecs.dclkmax < info->monspecs.dclkmin) {
1220                 hfmin = 29000; hfmax = 30000;
1221                 vfmin = 60; vfmax = 60;
1222                 dclkmin = 0; dclkmax = 25000000;
1223         } else {
1224                 hfmin = info->monspecs.hfmin;
1225                 hfmax = info->monspecs.hfmax;
1226                 vfmin = info->monspecs.vfmin;
1227                 vfmax = info->monspecs.vfmax;
1228                 dclkmin = info->monspecs.dclkmin;
1229                 dclkmax = info->monspecs.dclkmax;
1230         }
1231
1232         if (!var->pixclock)
1233                 return -EINVAL;
1234         pixclock = PICOS2KHZ(var->pixclock) * 1000;
1235            
1236         htotal = var->xres + var->right_margin + var->hsync_len + 
1237                 var->left_margin;
1238         vtotal = var->yres + var->lower_margin + var->vsync_len + 
1239                 var->upper_margin;
1240
1241         if (var->vmode & FB_VMODE_INTERLACED)
1242                 vtotal /= 2;
1243         if (var->vmode & FB_VMODE_DOUBLE)
1244                 vtotal *= 2;
1245
1246         hfreq = pixclock/htotal;
1247         hfreq = (hfreq + 500) / 1000 * 1000;
1248
1249         vfreq = hfreq/vtotal;
1250
1251         return (vfreq < vfmin || vfreq > vfmax || 
1252                 hfreq < hfmin || hfreq > hfmax ||
1253                 pixclock < dclkmin || pixclock > dclkmax) ?
1254                 -EINVAL : 0;
1255 }
1256
1257 #if defined(__i386__)
1258 #include <linux/pci.h>
1259
1260 /*
1261  * We need to ensure that the EDID block is only returned for
1262  * the primary graphics adapter.
1263  */
1264
1265 const unsigned char *fb_firmware_edid(struct device *device)
1266 {
1267         struct pci_dev *dev = NULL;
1268         struct resource *res = NULL;
1269         unsigned char *edid = NULL;
1270
1271         if (device)
1272                 dev = to_pci_dev(device);
1273
1274         if (dev)
1275                 res = &dev->resource[PCI_ROM_RESOURCE];
1276
1277         if (res && res->flags & IORESOURCE_ROM_SHADOW)
1278                 edid = edid_info.dummy;
1279
1280         return edid;
1281 }
1282 #else
1283 const unsigned char *fb_firmware_edid(struct device *device)
1284 {
1285         return NULL;
1286 }
1287 #endif /* _i386_ */
1288
1289 EXPORT_SYMBOL(fb_parse_edid);
1290 EXPORT_SYMBOL(fb_edid_to_monspecs);
1291 EXPORT_SYMBOL(fb_firmware_edid);
1292 EXPORT_SYMBOL(fb_get_mode);
1293 EXPORT_SYMBOL(fb_validate_mode);
1294 EXPORT_SYMBOL(fb_destroy_modedb);