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MOXA linux-2.6.x / linux-2.6.9-uc0 from sdlinux-moxaart.tgz
[linux-2.6.9-moxart.git] / drivers / video / fbmon.c
blobfb2f2254a90473734a2f401df4e4a50d6571399a
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 #ifdef CONFIG_PPC_OF
33 #include <linux/pci.h>
34 #include <asm/prom.h>
35 #include <asm/pci-bridge.h>
36 #endif
37 #include <video/edid.h>
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
54 #ifdef CONFIG_FB_MODE_HELPERS
55 struct broken_edid {
56 u8 manufacturer[4];
57 u32 model;
58 u32 fix;
59 };
60
61 static struct broken_edid brokendb[] = {
62 /* DEC FR-PCXAV-YZ */
63 { .manufacturer = "DEC",
64 .model = 0x073a,
65 .fix = FBMON_FIX_HEADER,
66 },
67 };
68
69 const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
70 0xff, 0xff, 0xff, 0x00
71 };
72 const unsigned char edid_v1_descriptor_flag[] = { 0x00, 0x00 };
73
74 static void copy_string(unsigned char *c, unsigned char *s)
75 {
76 int i;
77 c = c + 5;
78 for (i = 0; (i < 13 && *c != 0x0A); i++)
79 *(s++) = *(c++);
80 *s = 0;
81 while (i-- && (*--s == 0x20)) *s = 0;
82 }
83
84 static void fix_broken_edid(unsigned char *edid)
85 {
86 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
87 u32 model, i;
88
89 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
90 manufacturer[1] = ((block[0] & 0x03) << 3) +
91 ((block[1] & 0xe0) >> 5) + '@';
92 manufacturer[2] = (block[1] & 0x1f) + '@';
93 manufacturer[3] = 0;
94 model = block[2] + (block[3] << 8);
95
96 for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
97 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
98 brokendb[i].model == model) {
99 switch (brokendb[i].fix) {
100 case FBMON_FIX_HEADER:
101 printk("fbmon: The EDID header of "
102 "Manufacturer: %s Model: 0x%x is "
103 "known to be broken,\n"
104 "fbmon: trying a header "
105 "reconstruct\n", manufacturer, model);
106 memcpy(edid, edid_v1_header, 8);
107 break;
108 }
109 }
110 }
111 }
112
113 static int edid_checksum(unsigned char *edid)
114 {
115 unsigned char i, csum = 0, all_null = 0;
116
117 for (i = 0; i < EDID_LENGTH; i++) {
118 csum += edid[i];
119 all_null |= edid[i];
120 }
121
122 if (csum == 0x00 && all_null) {
123 /* checksum passed, everything's good */
124 return 1;
125 }
126
127 fix_broken_edid(edid);
128 csum = all_null = 0;
129 for (i = 0; i < EDID_LENGTH; i++) {
130 csum += edid[i];
131 all_null |= edid[i];
132 }
133 if (csum != 0x00 || !all_null) {
134 printk("EDID checksum failed, aborting\n");
135 return 0;
136 }
137 return 1;
138 }
139
140 static int edid_check_header(unsigned char *edid)
141 {
142 int i, fix = 0;
143
144 for (i = 0; i < 8; i++) {
145 if (edid[i] != edid_v1_header[i])
146 fix = 1;
147 }
148 if (!fix)
149 return 1;
150
151 fix_broken_edid(edid);
152 for (i = 0; i < 8; i++) {
153 if (edid[i] != edid_v1_header[i])
154 return 0;
155 }
156 return 1;
157 }
158
159 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
160 {
161 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
162 specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
163 ((block[1] & 0xe0) >> 5) + '@';
164 specs->manufacturer[2] = (block[1] & 0x1f) + '@';
165 specs->manufacturer[3] = 0;
166 specs->model = block[2] + (block[3] << 8);
167 specs->serial = block[4] + (block[5] << 8) +
168 (block[6] << 16) + (block[7] << 24);
169 specs->year = block[9] + 1990;
170 specs->week = block[8];
171 DPRINTK(" Manufacturer: %s\n", specs->manufacturer);
172 DPRINTK(" Model: %x\n", specs->model);
173 DPRINTK(" Serial#: %u\n", specs->serial);
174 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);
175 }
176
177 static void get_dpms_capabilities(unsigned char flags,
178 struct fb_monspecs *specs)
179 {
180 specs->dpms = 0;
181 if (flags & DPMS_ACTIVE_OFF)
182 specs->dpms |= FB_DPMS_ACTIVE_OFF;
183 if (flags & DPMS_SUSPEND)
184 specs->dpms |= FB_DPMS_SUSPEND;
185 if (flags & DPMS_STANDBY)
186 specs->dpms |= FB_DPMS_STANDBY;
187 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",
188 (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
189 (flags & DPMS_SUSPEND) ? "yes" : "no",
190 (flags & DPMS_STANDBY) ? "yes" : "no");
191 }
192
193 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
194 {
195 int tmp;
196
197 DPRINTK(" Chroma\n");
198 /* Chromaticity data */
199 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
200 tmp *= 1000;
201 tmp += 512;
202 specs->chroma.redx = tmp/1024;
203 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
204
205 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
206 tmp *= 1000;
207 tmp += 512;
208 specs->chroma.redy = tmp/1024;
209 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
210
211 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
212 tmp *= 1000;
213 tmp += 512;
214 specs->chroma.greenx = tmp/1024;
215 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
216
217 tmp = (block[5] & 3) | (block[0xa] << 2);
218 tmp *= 1000;
219 tmp += 512;
220 specs->chroma.greeny = tmp/1024;
221 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
222
223 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
224 tmp *= 1000;
225 tmp += 512;
226 specs->chroma.bluex = tmp/1024;
227 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
228
229 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
230 tmp *= 1000;
231 tmp += 512;
232 specs->chroma.bluey = tmp/1024;
233 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
234
235 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
236 tmp *= 1000;
237 tmp += 512;
238 specs->chroma.whitex = tmp/1024;
239 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
240
241 tmp = (block[6] & 3) | (block[0xe] << 2);
242 tmp *= 1000;
243 tmp += 512;
244 specs->chroma.whitey = tmp/1024;
245 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
246 }
247
248 static int edid_is_serial_block(unsigned char *block)
249 {
250 if ((block[0] == 0x00) && (block[1] == 0x00) &&
251 (block[2] == 0x00) && (block[3] == 0xff) &&
252 (block[4] == 0x00))
253 return 1;
254 else
255 return 0;
256 }
257
258 static int edid_is_ascii_block(unsigned char *block)
259 {
260 if ((block[0] == 0x00) && (block[1] == 0x00) &&
261 (block[2] == 0x00) && (block[3] == 0xfe) &&
262 (block[4] == 0x00))
263 return 1;
264 else
265 return 0;
266 }
267
268 static int edid_is_limits_block(unsigned char *block)
269 {
270 if ((block[0] == 0x00) && (block[1] == 0x00) &&
271 (block[2] == 0x00) && (block[3] == 0xfd) &&
272 (block[4] == 0x00))
273 return 1;
274 else
275 return 0;
276 }
277
278 static int edid_is_monitor_block(unsigned char *block)
279 {
280 if ((block[0] == 0x00) && (block[1] == 0x00) &&
281 (block[2] == 0x00) && (block[3] == 0xfc) &&
282 (block[4] == 0x00))
283 return 1;
284 else
285 return 0;
286 }
287
288 static void calc_mode_timings(int xres, int yres, int refresh, struct fb_videomode *mode)
289 {
290 struct fb_var_screeninfo var;
291 struct fb_info info;
292
293 var.xres = xres;
294 var.yres = yres;
295 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
296 refresh, &var, &info);
297 mode->xres = xres;
298 mode->yres = yres;
299 mode->pixclock = var.pixclock;
300 mode->refresh = refresh;
301 mode->left_margin = var.left_margin;
302 mode->right_margin = var.right_margin;
303 mode->upper_margin = var.upper_margin;
304 mode->lower_margin = var.lower_margin;
305 mode->hsync_len = var.hsync_len;
306 mode->vsync_len = var.vsync_len;
307 mode->vmode = 0;
308 mode->sync = 0;
309 }
310
311 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
312 {
313 int num = 0;
314 unsigned char c;
315
316 c = block[0];
317 if (c&0x80) {
318 calc_mode_timings(720, 400, 70, &mode[num]);
319 mode[num++].flag = FB_MODE_IS_CALCULATED;
320 DPRINTK(" 720x400@70Hz\n");
321 }
322 if (c&0x40) {
323 calc_mode_timings(720, 400, 88, &mode[num]);
324 mode[num++].flag = FB_MODE_IS_CALCULATED;
325 DPRINTK(" 720x400@88Hz\n");
326 }
327 if (c&0x20) {
328 mode[num++] = vesa_modes[3];
329 DPRINTK(" 640x480@60Hz\n");
330 }
331 if (c&0x10) {
332 calc_mode_timings(640, 480, 67, &mode[num]);
333 mode[num++].flag = FB_MODE_IS_CALCULATED;
334 DPRINTK(" 640x480@67Hz\n");
335 }
336 if (c&0x08) {
337 mode[num++] = vesa_modes[4];
338 DPRINTK(" 640x480@72Hz\n");
339 }
340 if (c&0x04) {
341 mode[num++] = vesa_modes[5];
342 DPRINTK(" 640x480@75Hz\n");
343 }
344 if (c&0x02) {
345 mode[num++] = vesa_modes[7];
346 DPRINTK(" 800x600@56Hz\n");
347 }
348 if (c&0x01) {
349 mode[num++] = vesa_modes[8];
350 DPRINTK(" 800x600@60Hz\n");
351 }
352
353 c = block[1];
354 if (c&0x80) {
355 mode[num++] = vesa_modes[9];
356 DPRINTK(" 800x600@72Hz\n");
357 }
358 if (c&0x40) {
359 mode[num++] = vesa_modes[10];
360 DPRINTK(" 800x600@75Hz\n");
361 }
362 if (c&0x20) {
363 calc_mode_timings(832, 624, 75, &mode[num]);
364 mode[num++].flag = FB_MODE_IS_CALCULATED;
365 DPRINTK(" 832x624@75Hz\n");
366 }
367 if (c&0x10) {
368 mode[num++] = vesa_modes[12];
369 DPRINTK(" 1024x768@87Hz Interlaced\n");
370 }
371 if (c&0x08) {
372 mode[num++] = vesa_modes[13];
373 DPRINTK(" 1024x768@60Hz\n");
374 }
375 if (c&0x04) {
376 mode[num++] = vesa_modes[14];
377 DPRINTK(" 1024x768@70Hz\n");
378 }
379 if (c&0x02) {
380 mode[num++] = vesa_modes[15];
381 DPRINTK(" 1024x768@75Hz\n");
382 }
383 if (c&0x01) {
384 mode[num++] = vesa_modes[21];
385 DPRINTK(" 1280x1024@75Hz\n");
386 }
387 c = block[2];
388 if (c&0x80) {
389 mode[num++] = vesa_modes[17];
390 DPRINTK(" 1152x870@75Hz\n");
391 }
392 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
393 return num;
394 }
395
396 static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
397 {
398 int xres, yres = 0, refresh, ratio, i;
399
400 xres = (block[0] + 31) * 8;
401 if (xres <= 256)
402 return 0;
403
404 ratio = (block[1] & 0xc0) >> 6;
405 switch (ratio) {
406 case 0:
407 yres = xres;
408 break;
409 case 1:
410 yres = (xres * 3)/4;
411 break;
412 case 2:
413 yres = (xres * 4)/5;
414 break;
415 case 3:
416 yres = (xres * 9)/16;
417 break;
418 }
419 refresh = (block[1] & 0x3f) + 60;
420
421 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
422 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
423 if (vesa_modes[i].xres == xres &&
424 vesa_modes[i].yres == yres &&
425 vesa_modes[i].refresh == refresh) {
426 *mode = vesa_modes[i];
427 mode->flag |= FB_MODE_IS_STANDARD;
428 return 1;
429 }
430 }
431 calc_mode_timings(xres, yres, refresh, mode);
432 return 1;
433 }
434
435 static int get_dst_timing(unsigned char *block,
436 struct fb_videomode *mode)
437 {
438 int j, num = 0;
439
440 for (j = 0; j < 6; j++, block+= STD_TIMING_DESCRIPTION_SIZE)
441 num += get_std_timing(block, &mode[num]);
442
443 return num;
444 }
445
446 static void get_detailed_timing(unsigned char *block,
447 struct fb_videomode *mode)
448 {
449 mode->xres = H_ACTIVE;
450 mode->yres = V_ACTIVE;
451 mode->pixclock = PIXEL_CLOCK;
452 mode->pixclock /= 1000;
453 mode->pixclock = KHZ2PICOS(mode->pixclock);
454 mode->right_margin = H_SYNC_OFFSET;
455 mode->left_margin = (H_ACTIVE + H_BLANKING) -
456 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
457 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
458 V_SYNC_WIDTH;
459 mode->lower_margin = V_SYNC_OFFSET;
460 mode->hsync_len = H_SYNC_WIDTH;
461 mode->vsync_len = V_SYNC_WIDTH;
462 if (HSYNC_POSITIVE)
463 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
464 if (VSYNC_POSITIVE)
465 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
466 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
467 (V_ACTIVE + V_BLANKING));
468 mode->vmode = 0;
469 mode->flag = FB_MODE_IS_DETAILED;
470
471 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
472 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
473 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
474 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
475 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
476 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
477 (VSYNC_POSITIVE) ? "+" : "-");
478 }
479
480 /**
481 * fb_create_modedb - create video mode database
482 * @edid: EDID data
483 * @dbsize: database size
484 *
485 * RETURNS: struct fb_videomode, @dbsize contains length of database
486 *
487 * DESCRIPTION:
488 * This function builds a mode database using the contents of the EDID
489 * data
490 */
491 struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
492 {
493 struct fb_videomode *mode, *m;
494 unsigned char *block;
495 int num = 0, i;
496
497 mode = kmalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
498 if (mode == NULL)
499 return NULL;
500 memset(mode, 0, 50 * sizeof(struct fb_videomode));
501
502 if (edid == NULL || !edid_checksum(edid) ||
503 !edid_check_header(edid)) {
504 kfree(mode);
505 return NULL;
506 }
507
508 *dbsize = 0;
509
510 DPRINTK(" Supported VESA Modes\n");
511 block = edid + ESTABLISHED_TIMING_1;
512 num += get_est_timing(block, &mode[num]);
513
514 DPRINTK(" Standard Timings\n");
515 block = edid + STD_TIMING_DESCRIPTIONS_START;
516 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
517 num += get_std_timing(block, &mode[num]);
518
519 DPRINTK(" Detailed Timings\n");
520 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
521 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
522 int first = 1;
523
524 if (block[0] == 0x00 && block[1] == 0x00) {
525 if (block[3] == 0xfa) {
526 num += get_dst_timing(block + 5, &mode[num]);
527 }
528 } else {
529 get_detailed_timing(block, &mode[num]);
530 if (first) {
531 mode[num].flag |= FB_MODE_IS_FIRST;
532 first = 0;
533 }
534 num++;
535 }
536 }
537
538 /* Yikes, EDID data is totally useless */
539 if (!num) {
540 kfree(mode);
541 return NULL;
542 }
543
544 *dbsize = num;
545 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
546 if (!m)
547 return mode;
548 memmove(m, mode, num * sizeof(struct fb_videomode));
549 kfree(mode);
550 return m;
551 }
552
553 /**
554 * fb_destroy_modedb - destroys mode database
555 * @modedb: mode database to destroy
556 *
557 * DESCRIPTION:
558 * Destroy mode database created by fb_create_modedb
559 */
560 void fb_destroy_modedb(struct fb_videomode *modedb)
561 {
562 if (modedb)
563 kfree(modedb);
564 }
565
566 int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
567 {
568 int i, retval = 1;
569 unsigned char *block;
570
571 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
572
573 DPRINTK(" Monitor Operating Limits: ");
574 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
575 if (edid_is_limits_block(block)) {
576 specs->hfmin = H_MIN_RATE * 1000;
577 specs->hfmax = H_MAX_RATE * 1000;
578 specs->vfmin = V_MIN_RATE;
579 specs->vfmax = V_MAX_RATE;
580 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
581 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
582 retval = 0;
583 DPRINTK("From EDID\n");
584 break;
585 }
586 }
587
588 /* estimate monitor limits based on modes supported */
589 if (retval) {
590 struct fb_videomode *modes;
591 int num_modes, i, hz, hscan, pixclock;
592
593 modes = fb_create_modedb(edid, &num_modes);
594 if (!modes) {
595 DPRINTK("None Available\n");
596 return 1;
597 }
598
599 retval = 0;
600 for (i = 0; i < num_modes; i++) {
601 hz = modes[i].refresh;
602 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
603 hscan = (modes[i].yres * 105 * hz + 5000)/100;
604
605 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
606 specs->dclkmax = pixclock;
607 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
608 specs->dclkmin = pixclock;
609 if (specs->hfmax == 0 || specs->hfmax < hscan)
610 specs->hfmax = hscan;
611 if (specs->hfmin == 0 || specs->hfmin > hscan)
612 specs->hfmin = hscan;
613 if (specs->vfmax == 0 || specs->vfmax < hz)
614 specs->vfmax = hz;
615 if (specs->vfmin == 0 || specs->vfmin > hz)
616 specs->vfmin = hz;
617 }
618 DPRINTK("Extrapolated\n");
619 fb_destroy_modedb(modes);
620 }
621 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
622 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
623 specs->vfmax, specs->dclkmax/1000000);
624 return retval;
625 }
626
627 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
628 {
629 unsigned char c, *block;
630
631 block = edid + EDID_STRUCT_DISPLAY;
632
633 fb_get_monitor_limits(edid, specs);
634
635 c = (block[0] & 0x80) >> 7;
636 specs->input = 0;
637 if (c) {
638 specs->input |= FB_DISP_DDI;
639 DPRINTK(" Digital Display Input");
640 } else {
641 DPRINTK(" Analog Display Input: Input Voltage - ");
642 switch ((block[0] & 0x60) >> 5) {
643 case 0:
644 DPRINTK("0.700V/0.300V");
645 specs->input |= FB_DISP_ANA_700_300;
646 break;
647 case 1:
648 DPRINTK("0.714V/0.286V");
649 specs->input |= FB_DISP_ANA_714_286;
650 break;
651 case 2:
652 DPRINTK("1.000V/0.400V");
653 specs->input |= FB_DISP_ANA_1000_400;
654 break;
655 case 3:
656 DPRINTK("0.700V/0.000V");
657 specs->input |= FB_DISP_ANA_700_000;
658 break;
659 default:
660 DPRINTK("unknown");
661 specs->input |= FB_DISP_UNKNOWN;
662 }
663 }
664 DPRINTK("\n Sync: ");
665 c = (block[0] & 0x10) >> 4;
666 if (c)
667 DPRINTK(" Configurable signal level\n");
668 c = block[0] & 0x0f;
669 specs->signal = 0;
670 if (c & 0x10) {
671 DPRINTK("Blank to Blank ");
672 specs->signal |= FB_SIGNAL_BLANK_BLANK;
673 }
674 if (c & 0x08) {
675 DPRINTK("Separate ");
676 specs->signal |= FB_SIGNAL_SEPARATE;
677 }
678 if (c & 0x04) {
679 DPRINTK("Composite ");
680 specs->signal |= FB_SIGNAL_COMPOSITE;
681 }
682 if (c & 0x02) {
683 DPRINTK("Sync on Green ");
684 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
685 }
686 if (c & 0x01) {
687 DPRINTK("Serration on ");
688 specs->signal |= FB_SIGNAL_SERRATION_ON;
689 }
690 DPRINTK("\n");
691 specs->max_x = block[1];
692 specs->max_y = block[2];
693 DPRINTK(" Max H-size in cm: ");
694 if (specs->max_x)
695 DPRINTK("%d\n", specs->max_x);
696 else
697 DPRINTK("variable\n");
698 DPRINTK(" Max V-size in cm: ");
699 if (specs->max_y)
700 DPRINTK("%d\n", specs->max_y);
701 else
702 DPRINTK("variable\n");
703
704 c = block[3];
705 specs->gamma = c+100;
706 DPRINTK(" Gamma: ");
707 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
708
709 get_dpms_capabilities(block[4], specs);
710
711 switch ((block[4] & 0x18) >> 3) {
712 case 0:
713 DPRINTK(" Monochrome/Grayscale\n");
714 specs->input |= FB_DISP_MONO;
715 break;
716 case 1:
717 DPRINTK(" RGB Color Display\n");
718 specs->input |= FB_DISP_RGB;
719 break;
720 case 2:
721 DPRINTK(" Non-RGB Multicolor Display\n");
722 specs->input |= FB_DISP_MULTI;
723 break;
724 default:
725 DPRINTK(" Unknown\n");
726 specs->input |= FB_DISP_UNKNOWN;
727 break;
728 }
729
730 get_chroma(block, specs);
731
732 specs->misc = 0;
733 c = block[4] & 0x7;
734 if (c & 0x04) {
735 DPRINTK(" Default color format is primary\n");
736 specs->misc |= FB_MISC_PRIM_COLOR;
737 }
738 if (c & 0x02) {
739 DPRINTK(" First DETAILED Timing is preferred\n");
740 specs->misc |= FB_MISC_1ST_DETAIL;
741 }
742 if (c & 0x01) {
743 printk(" Display is GTF capable\n");
744 specs->gtf = 1;
745 }
746 }
747
748 static int edid_is_timing_block(unsigned char *block)
749 {
750 if ((block[0] != 0x00) || (block[1] != 0x00) ||
751 (block[2] != 0x00) || (block[4] != 0x00))
752 return 1;
753 else
754 return 0;
755 }
756
757 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
758 {
759 int i;
760 unsigned char *block;
761
762 if (edid == NULL || var == NULL)
763 return 1;
764
765 if (!(edid_checksum(edid)))
766 return 1;
767
768 if (!(edid_check_header(edid)))
769 return 1;
770
771 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
772
773 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
774 if (edid_is_timing_block(block)) {
775 var->xres = var->xres_virtual = H_ACTIVE;
776 var->yres = var->yres_virtual = V_ACTIVE;
777 var->height = var->width = -1;
778 var->right_margin = H_SYNC_OFFSET;
779 var->left_margin = (H_ACTIVE + H_BLANKING) -
780 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
781 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
782 V_SYNC_WIDTH;
783 var->lower_margin = V_SYNC_OFFSET;
784 var->hsync_len = H_SYNC_WIDTH;
785 var->vsync_len = V_SYNC_WIDTH;
786 var->pixclock = PIXEL_CLOCK;
787 var->pixclock /= 1000;
788 var->pixclock = KHZ2PICOS(var->pixclock);
789
790 if (HSYNC_POSITIVE)
791 var->sync |= FB_SYNC_HOR_HIGH_ACT;
792 if (VSYNC_POSITIVE)
793 var->sync |= FB_SYNC_VERT_HIGH_ACT;
794 return 0;
795 }
796 }
797 return 1;
798 }
799
800 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
801 {
802 unsigned char *block;
803 int i;
804
805 if (edid == NULL)
806 return;
807
808 if (!(edid_checksum(edid)))
809 return;
810
811 if (!(edid_check_header(edid)))
812 return;
813
814 memset(specs, 0, sizeof(struct fb_monspecs));
815
816 specs->version = edid[EDID_STRUCT_VERSION];
817 specs->revision = edid[EDID_STRUCT_REVISION];
818
819 DPRINTK("========================================\n");
820 DPRINTK("Display Information (EDID)\n");
821 DPRINTK("========================================\n");
822 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
823 (int) specs->revision);
824
825 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
826
827 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
828 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
829 if (edid_is_serial_block(block)) {
830 copy_string(block, specs->serial_no);
831 DPRINTK(" Serial Number: %s\n", specs->serial_no);
832 } else if (edid_is_ascii_block(block)) {
833 copy_string(block, specs->ascii);
834 DPRINTK(" ASCII Block: %s\n", specs->ascii);
835 } else if (edid_is_monitor_block(block)) {
836 copy_string(block, specs->monitor);
837 DPRINTK(" Monitor Name: %s\n", specs->monitor);
838 }
839 }
840
841 DPRINTK(" Display Characteristics:\n");
842 get_monspecs(edid, specs);
843
844 specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
845 DPRINTK("========================================\n");
846 }
847
848 char *get_EDID_from_firmware(struct device *dev)
849 {
850 unsigned char *pedid = NULL;
851
852 #if defined(CONFIG_EDID_FIRMWARE) && defined(CONFIG_X86)
853 pedid = edid_info.dummy;
854 if (!pedid)
855 return NULL;
856 #endif
857 return pedid;
858 }
859
860 /*
861 * VESA Generalized Timing Formula (GTF)
862 */
863
864 #define FLYBACK 550
865 #define V_FRONTPORCH 1
866 #define H_OFFSET 40
867 #define H_SCALEFACTOR 20
868 #define H_BLANKSCALE 128
869 #define H_GRADIENT 600
870 #define C_VAL 30
871 #define M_VAL 300
872
873 struct __fb_timings {
874 u32 dclk;
875 u32 hfreq;
876 u32 vfreq;
877 u32 hactive;
878 u32 vactive;
879 u32 hblank;
880 u32 vblank;
881 u32 htotal;
882 u32 vtotal;
883 };
884
885 /**
886 * fb_get_vblank - get vertical blank time
887 * @hfreq: horizontal freq
888 *
889 * DESCRIPTION:
890 * vblank = right_margin + vsync_len + left_margin
891 *
892 * given: right_margin = 1 (V_FRONTPORCH)
893 * vsync_len = 3
894 * flyback = 550
895 *
896 * flyback * hfreq
897 * left_margin = --------------- - vsync_len
898 * 1000000
899 */
900 static u32 fb_get_vblank(u32 hfreq)
901 {
902 u32 vblank;
903
904 vblank = (hfreq * FLYBACK)/1000;
905 vblank = (vblank + 500)/1000;
906 return (vblank + V_FRONTPORCH);
907 }
908
909 /**
910 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
911 * @hfreq: horizontal freq
912 * @xres: horizontal resolution in pixels
913 *
914 * DESCRIPTION:
915 *
916 * xres * duty_cycle
917 * hblank = ------------------
918 * 100 - duty_cycle
919 *
920 * duty cycle = percent of htotal assigned to inactive display
921 * duty cycle = C - (M/Hfreq)
922 *
923 * where: C = ((offset - scale factor) * blank_scale)
924 * -------------------------------------- + scale factor
925 * 256
926 * M = blank_scale * gradient
927 *
928 */
929 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
930 {
931 u32 c_val, m_val, duty_cycle, hblank;
932
933 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
934 H_SCALEFACTOR) * 1000;
935 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
936 m_val = (m_val * 1000000)/hfreq;
937 duty_cycle = c_val - m_val;
938 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
939 return (hblank);
940 }
941
942 /**
943 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
944 * @dclk: pixelclock in Hz
945 * @xres: horizontal resolution in pixels
946 *
947 * DESCRIPTION:
948 *
949 * xres * duty_cycle
950 * hblank = ------------------
951 * 100 - duty_cycle
952 *
953 * duty cycle = percent of htotal assigned to inactive display
954 * duty cycle = C - (M * h_period)
955 *
956 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
957 * -----------------------------------------------
958 * 2 * M
959 * M = 300;
960 * C = 30;
961
962 */
963 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
964 {
965 u32 duty_cycle, h_period, hblank;
966
967 dclk /= 1000;
968 h_period = 100 - C_VAL;
969 h_period *= h_period;
970 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
971 h_period *=10000;
972
973 h_period = int_sqrt(h_period);
974 h_period -= (100 - C_VAL) * 100;
975 h_period *= 1000;
976 h_period /= 2 * M_VAL;
977
978 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
979 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
980 hblank &= ~15;
981 return (hblank);
982 }
983
984 /**
985 * fb_get_hfreq - estimate hsync
986 * @vfreq: vertical refresh rate
987 * @yres: vertical resolution
988 *
989 * DESCRIPTION:
990 *
991 * (yres + front_port) * vfreq * 1000000
992 * hfreq = -------------------------------------
993 * (1000000 - (vfreq * FLYBACK)
994 *
995 */
996
997 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
998 {
999 u32 divisor, hfreq;
1000
1001 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1002 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1003 return (hfreq/divisor);
1004 }
1005
1006 static void fb_timings_vfreq(struct __fb_timings *timings)
1007 {
1008 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1009 timings->vblank = fb_get_vblank(timings->hfreq);
1010 timings->vtotal = timings->vactive + timings->vblank;
1011 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1012 timings->hactive);
1013 timings->htotal = timings->hactive + timings->hblank;
1014 timings->dclk = timings->htotal * timings->hfreq;
1015 }
1016
1017 static void fb_timings_hfreq(struct __fb_timings *timings)
1018 {
1019 timings->vblank = fb_get_vblank(timings->hfreq);
1020 timings->vtotal = timings->vactive + timings->vblank;
1021 timings->vfreq = timings->hfreq/timings->vtotal;
1022 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1023 timings->hactive);
1024 timings->htotal = timings->hactive + timings->hblank;
1025 timings->dclk = timings->htotal * timings->hfreq;
1026 }
1027
1028 static void fb_timings_dclk(struct __fb_timings *timings)
1029 {
1030 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1031 timings->hactive);
1032 timings->htotal = timings->hactive + timings->hblank;
1033 timings->hfreq = timings->dclk/timings->htotal;
1034 timings->vblank = fb_get_vblank(timings->hfreq);
1035 timings->vtotal = timings->vactive + timings->vblank;
1036 timings->vfreq = timings->hfreq/timings->vtotal;
1037 }
1038
1039 /*
1040 * fb_get_mode - calculates video mode using VESA GTF
1041 * @flags: if: 0 - maximize vertical refresh rate
1042 * 1 - vrefresh-driven calculation;
1043 * 2 - hscan-driven calculation;
1044 * 3 - pixelclock-driven calculation;
1045 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1046 * @var: pointer to fb_var_screeninfo
1047 * @info: pointer to fb_info
1048 *
1049 * DESCRIPTION:
1050 * Calculates video mode based on monitor specs using VESA GTF.
1051 * The GTF is best for VESA GTF compliant monitors but is
1052 * specifically formulated to work for older monitors as well.
1053 *
1054 * If @flag==0, the function will attempt to maximize the
1055 * refresh rate. Otherwise, it will calculate timings based on
1056 * the flag and accompanying value.
1057 *
1058 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1059 * ignored and @var will be filled with the calculated timings.
1060 *
1061 * All calculations are based on the VESA GTF Spreadsheet
1062 * available at VESA's public ftp (http://www.vesa.org).
1063 *
1064 * NOTES:
1065 * The timings generated by the GTF will be different from VESA
1066 * DMT. It might be a good idea to keep a table of standard
1067 * VESA modes as well. The GTF may also not work for some displays,
1068 * such as, and especially, analog TV.
1069 *
1070 * REQUIRES:
1071 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1072 */
1073 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1074 {
1075 struct __fb_timings timings;
1076 u32 interlace = 1, dscan = 1;
1077 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1078
1079 /*
1080 * If monspecs are invalid, use values that are enough
1081 * for 640x480@60
1082 */
1083 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1084 !info->monspecs.dclkmax ||
1085 info->monspecs.hfmax < info->monspecs.hfmin ||
1086 info->monspecs.vfmax < info->monspecs.vfmin ||
1087 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1088 hfmin = 29000; hfmax = 30000;
1089 vfmin = 60; vfmax = 60;
1090 dclkmin = 0; dclkmax = 25000000;
1091 } else {
1092 hfmin = info->monspecs.hfmin;
1093 hfmax = info->monspecs.hfmax;
1094 vfmin = info->monspecs.vfmin;
1095 vfmax = info->monspecs.vfmax;
1096 dclkmin = info->monspecs.dclkmin;
1097 dclkmax = info->monspecs.dclkmax;
1098 }
1099
1100 memset(&timings, 0, sizeof(struct __fb_timings));
1101 timings.hactive = var->xres;
1102 timings.vactive = var->yres;
1103 if (var->vmode & FB_VMODE_INTERLACED) {
1104 timings.vactive /= 2;
1105 interlace = 2;
1106 }
1107 if (var->vmode & FB_VMODE_DOUBLE) {
1108 timings.vactive *= 2;
1109 dscan = 2;
1110 }
1111
1112 switch (flags & ~FB_IGNOREMON) {
1113 case FB_MAXTIMINGS: /* maximize refresh rate */
1114 timings.hfreq = hfmax;
1115 fb_timings_hfreq(&timings);
1116 if (timings.vfreq > vfmax) {
1117 timings.vfreq = vfmax;
1118 fb_timings_vfreq(&timings);
1119 }
1120 if (timings.dclk > dclkmax) {
1121 timings.dclk = dclkmax;
1122 fb_timings_dclk(&timings);
1123 }
1124 break;
1125 case FB_VSYNCTIMINGS: /* vrefresh driven */
1126 timings.vfreq = val;
1127 fb_timings_vfreq(&timings);
1128 break;
1129 case FB_HSYNCTIMINGS: /* hsync driven */
1130 timings.hfreq = val;
1131 fb_timings_hfreq(&timings);
1132 break;
1133 case FB_DCLKTIMINGS: /* pixelclock driven */
1134 timings.dclk = PICOS2KHZ(val) * 1000;
1135 fb_timings_dclk(&timings);
1136 break;
1137 default:
1138 return -EINVAL;
1139
1140 }
1141
1142 if (!(flags & FB_IGNOREMON) &&
1143 (timings.vfreq < vfmin || timings.vfreq > vfmax ||
1144 timings.hfreq < hfmin || timings.hfreq > hfmax ||
1145 timings.dclk < dclkmin || timings.dclk > dclkmax))
1146 return -EINVAL;
1147
1148 var->pixclock = KHZ2PICOS(timings.dclk/1000);
1149 var->hsync_len = (timings.htotal * 8)/100;
1150 var->right_margin = (timings.hblank/2) - var->hsync_len;
1151 var->left_margin = timings.hblank - var->right_margin - var->hsync_len;
1152
1153 var->vsync_len = (3 * interlace)/dscan;
1154 var->lower_margin = (1 * interlace)/dscan;
1155 var->upper_margin = (timings.vblank * interlace)/dscan -
1156 (var->vsync_len + var->lower_margin);
1157
1158 return 0;
1159 }
1160 #else
1161 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1162 {
1163 return 1;
1164 }
1165 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1166 {
1167 specs = NULL;
1168 }
1169 char *get_EDID_from_firmware(struct device *dev)
1170 {
1171 return NULL;
1172 }
1173 struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
1174 {
1175 return NULL;
1176 }
1177 void fb_destroy_modedb(struct fb_videomode *modedb)
1178 {
1179 }
1180 int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
1181 {
1182 return 1;
1183 }
1184 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1185 struct fb_info *info)
1186 {
1187 return -EINVAL;
1188 }
1189 #endif /* CONFIG_FB_MODE_HELPERS */
1190
1191 /*
1192 * fb_validate_mode - validates var against monitor capabilities
1193 * @var: pointer to fb_var_screeninfo
1194 * @info: pointer to fb_info
1195 *
1196 * DESCRIPTION:
1197 * Validates video mode against monitor capabilities specified in
1198 * info->monspecs.
1199 *
1200 * REQUIRES:
1201 * A valid info->monspecs.
1202 */
1203 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1204 {
1205 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1206 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1207
1208 /*
1209 * If monspecs are invalid, use values that are enough
1210 * for 640x480@60
1211 */
1212 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1213 !info->monspecs.dclkmax ||
1214 info->monspecs.hfmax < info->monspecs.hfmin ||
1215 info->monspecs.vfmax < info->monspecs.vfmin ||
1216 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1217 hfmin = 29000; hfmax = 30000;
1218 vfmin = 60; vfmax = 60;
1219 dclkmin = 0; dclkmax = 25000000;
1220 } else {
1221 hfmin = info->monspecs.hfmin;
1222 hfmax = info->monspecs.hfmax;
1223 vfmin = info->monspecs.vfmin;
1224 vfmax = info->monspecs.vfmax;
1225 dclkmin = info->monspecs.dclkmin;
1226 dclkmax = info->monspecs.dclkmax;
1227 }
1228
1229 if (!var->pixclock)
1230 return -EINVAL;
1231 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1232
1233 htotal = var->xres + var->right_margin + var->hsync_len +
1234 var->left_margin;
1235 vtotal = var->yres + var->lower_margin + var->vsync_len +
1236 var->upper_margin;
1237
1238 if (var->vmode & FB_VMODE_INTERLACED)
1239 vtotal /= 2;
1240 if (var->vmode & FB_VMODE_DOUBLE)
1241 vtotal *= 2;
1242
1243 hfreq = pixclock/htotal;
1244 vfreq = hfreq/vtotal;
1245
1246 return (vfreq < vfmin || vfreq > vfmax ||
1247 hfreq < hfmin || hfreq > hfmax ||
1248 pixclock < dclkmin || pixclock > dclkmax) ?
1249 -EINVAL : 0;
1250 }
1251
1252 EXPORT_SYMBOL(fb_parse_edid);
1253 EXPORT_SYMBOL(fb_edid_to_monspecs);
1254 EXPORT_SYMBOL(get_EDID_from_firmware);
1255
1256 EXPORT_SYMBOL(fb_get_mode);
1257 EXPORT_SYMBOL(fb_validate_mode);
1258 EXPORT_SYMBOL(fb_create_modedb);
1259 EXPORT_SYMBOL(fb_destroy_modedb);
1260 EXPORT_SYMBOL(fb_get_monitor_limits);
MOXA 2.6.9 from sdlinux-moxaart.tgz