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[MTD] Introduce MTD_BIT_WRITEABLE
[linux-2.6/mini2440.git] / drivers / video / fbmon.c
blob53beeb4a99981af1a2079201e7fc9c2f26fe27e4
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
322 var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
323
324 if (var) {
325 var->xres = xres;
326 var->yres = yres;
327 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
328 refresh, var, NULL);
329 mode->xres = xres;
330 mode->yres = yres;
331 mode->pixclock = var->pixclock;
332 mode->refresh = refresh;
333 mode->left_margin = var->left_margin;
334 mode->right_margin = var->right_margin;
335 mode->upper_margin = var->upper_margin;
336 mode->lower_margin = var->lower_margin;
337 mode->hsync_len = var->hsync_len;
338 mode->vsync_len = var->vsync_len;
339 mode->vmode = 0;
340 mode->sync = 0;
341 kfree(var);
342 }
343 }
344
345 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
346 {
347 int num = 0;
348 unsigned char c;
349
350 c = block[0];
351 if (c&0x80) {
352 calc_mode_timings(720, 400, 70, &mode[num]);
353 mode[num++].flag = FB_MODE_IS_CALCULATED;
354 DPRINTK(" 720x400@70Hz\n");
355 }
356 if (c&0x40) {
357 calc_mode_timings(720, 400, 88, &mode[num]);
358 mode[num++].flag = FB_MODE_IS_CALCULATED;
359 DPRINTK(" 720x400@88Hz\n");
360 }
361 if (c&0x20) {
362 mode[num++] = vesa_modes[3];
363 DPRINTK(" 640x480@60Hz\n");
364 }
365 if (c&0x10) {
366 calc_mode_timings(640, 480, 67, &mode[num]);
367 mode[num++].flag = FB_MODE_IS_CALCULATED;
368 DPRINTK(" 640x480@67Hz\n");
369 }
370 if (c&0x08) {
371 mode[num++] = vesa_modes[4];
372 DPRINTK(" 640x480@72Hz\n");
373 }
374 if (c&0x04) {
375 mode[num++] = vesa_modes[5];
376 DPRINTK(" 640x480@75Hz\n");
377 }
378 if (c&0x02) {
379 mode[num++] = vesa_modes[7];
380 DPRINTK(" 800x600@56Hz\n");
381 }
382 if (c&0x01) {
383 mode[num++] = vesa_modes[8];
384 DPRINTK(" 800x600@60Hz\n");
385 }
386
387 c = block[1];
388 if (c&0x80) {
389 mode[num++] = vesa_modes[9];
390 DPRINTK(" 800x600@72Hz\n");
391 }
392 if (c&0x40) {
393 mode[num++] = vesa_modes[10];
394 DPRINTK(" 800x600@75Hz\n");
395 }
396 if (c&0x20) {
397 calc_mode_timings(832, 624, 75, &mode[num]);
398 mode[num++].flag = FB_MODE_IS_CALCULATED;
399 DPRINTK(" 832x624@75Hz\n");
400 }
401 if (c&0x10) {
402 mode[num++] = vesa_modes[12];
403 DPRINTK(" 1024x768@87Hz Interlaced\n");
404 }
405 if (c&0x08) {
406 mode[num++] = vesa_modes[13];
407 DPRINTK(" 1024x768@60Hz\n");
408 }
409 if (c&0x04) {
410 mode[num++] = vesa_modes[14];
411 DPRINTK(" 1024x768@70Hz\n");
412 }
413 if (c&0x02) {
414 mode[num++] = vesa_modes[15];
415 DPRINTK(" 1024x768@75Hz\n");
416 }
417 if (c&0x01) {
418 mode[num++] = vesa_modes[21];
419 DPRINTK(" 1280x1024@75Hz\n");
420 }
421 c = block[2];
422 if (c&0x80) {
423 mode[num++] = vesa_modes[17];
424 DPRINTK(" 1152x870@75Hz\n");
425 }
426 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
427 return num;
428 }
429
430 static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
431 {
432 int xres, yres = 0, refresh, ratio, i;
433
434 xres = (block[0] + 31) * 8;
435 if (xres <= 256)
436 return 0;
437
438 ratio = (block[1] & 0xc0) >> 6;
439 switch (ratio) {
440 case 0:
441 yres = xres;
442 break;
443 case 1:
444 yres = (xres * 3)/4;
445 break;
446 case 2:
447 yres = (xres * 4)/5;
448 break;
449 case 3:
450 yres = (xres * 9)/16;
451 break;
452 }
453 refresh = (block[1] & 0x3f) + 60;
454
455 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
456 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
457 if (vesa_modes[i].xres == xres &&
458 vesa_modes[i].yres == yres &&
459 vesa_modes[i].refresh == refresh) {
460 *mode = vesa_modes[i];
461 mode->flag |= FB_MODE_IS_STANDARD;
462 return 1;
463 }
464 }
465 calc_mode_timings(xres, yres, refresh, mode);
466 return 1;
467 }
468
469 static int get_dst_timing(unsigned char *block,
470 struct fb_videomode *mode)
471 {
472 int j, num = 0;
473
474 for (j = 0; j < 6; j++, block+= STD_TIMING_DESCRIPTION_SIZE)
475 num += get_std_timing(block, &mode[num]);
476
477 return num;
478 }
479
480 static void get_detailed_timing(unsigned char *block,
481 struct fb_videomode *mode)
482 {
483 mode->xres = H_ACTIVE;
484 mode->yres = V_ACTIVE;
485 mode->pixclock = PIXEL_CLOCK;
486 mode->pixclock /= 1000;
487 mode->pixclock = KHZ2PICOS(mode->pixclock);
488 mode->right_margin = H_SYNC_OFFSET;
489 mode->left_margin = (H_ACTIVE + H_BLANKING) -
490 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
491 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
492 V_SYNC_WIDTH;
493 mode->lower_margin = V_SYNC_OFFSET;
494 mode->hsync_len = H_SYNC_WIDTH;
495 mode->vsync_len = V_SYNC_WIDTH;
496 if (HSYNC_POSITIVE)
497 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
498 if (VSYNC_POSITIVE)
499 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
500 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
501 (V_ACTIVE + V_BLANKING));
502 mode->vmode = 0;
503 mode->flag = FB_MODE_IS_DETAILED;
504
505 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
506 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
507 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
508 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
509 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
510 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
511 (VSYNC_POSITIVE) ? "+" : "-");
512 }
513
514 /**
515 * fb_create_modedb - create video mode database
516 * @edid: EDID data
517 * @dbsize: database size
518 *
519 * RETURNS: struct fb_videomode, @dbsize contains length of database
520 *
521 * DESCRIPTION:
522 * This function builds a mode database using the contents of the EDID
523 * data
524 */
525 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
526 {
527 struct fb_videomode *mode, *m;
528 unsigned char *block;
529 int num = 0, i;
530
531 mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
532 if (mode == NULL)
533 return NULL;
534
535 if (edid == NULL || !edid_checksum(edid) ||
536 !edid_check_header(edid)) {
537 kfree(mode);
538 return NULL;
539 }
540
541 *dbsize = 0;
542
543 DPRINTK(" Detailed Timings\n");
544 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
545 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
546 int first = 1;
547
548 if (!(block[0] == 0x00 && block[1] == 0x00)) {
549 get_detailed_timing(block, &mode[num]);
550 if (first) {
551 mode[num].flag |= FB_MODE_IS_FIRST;
552 first = 0;
553 }
554 num++;
555 }
556 }
557
558 DPRINTK(" Supported VESA Modes\n");
559 block = edid + ESTABLISHED_TIMING_1;
560 num += get_est_timing(block, &mode[num]);
561
562 DPRINTK(" Standard Timings\n");
563 block = edid + STD_TIMING_DESCRIPTIONS_START;
564 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
565 num += get_std_timing(block, &mode[num]);
566
567 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
568 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
569 if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
570 num += get_dst_timing(block + 5, &mode[num]);
571 }
572
573 /* Yikes, EDID data is totally useless */
574 if (!num) {
575 kfree(mode);
576 return NULL;
577 }
578
579 *dbsize = num;
580 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
581 if (!m)
582 return mode;
583 memmove(m, mode, num * sizeof(struct fb_videomode));
584 kfree(mode);
585 return m;
586 }
587
588 /**
589 * fb_destroy_modedb - destroys mode database
590 * @modedb: mode database to destroy
591 *
592 * DESCRIPTION:
593 * Destroy mode database created by fb_create_modedb
594 */
595 void fb_destroy_modedb(struct fb_videomode *modedb)
596 {
597 kfree(modedb);
598 }
599
600 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
601 {
602 int i, retval = 1;
603 unsigned char *block;
604
605 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
606
607 DPRINTK(" Monitor Operating Limits: ");
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;
625 int num_modes, i, hz, hscan, pixclock;
626
627 modes = fb_create_modedb(edid, &num_modes);
628 if (!modes) {
629 DPRINTK("None Available\n");
630 return 1;
631 }
632
633 retval = 0;
634 for (i = 0; i < num_modes; i++) {
635 hz = modes[i].refresh;
636 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
637 hscan = (modes[i].yres * 105 * hz + 5000)/100;
638
639 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
640 specs->dclkmax = pixclock;
641 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
642 specs->dclkmin = pixclock;
643 if (specs->hfmax == 0 || specs->hfmax < hscan)
644 specs->hfmax = hscan;
645 if (specs->hfmin == 0 || specs->hfmin > hscan)
646 specs->hfmin = hscan;
647 if (specs->vfmax == 0 || specs->vfmax < hz)
648 specs->vfmax = hz;
649 if (specs->vfmin == 0 || specs->vfmin > hz)
650 specs->vfmin = hz;
651 }
652 DPRINTK("Extrapolated\n");
653 fb_destroy_modedb(modes);
654 }
655 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
656 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
657 specs->vfmax, specs->dclkmax/1000000);
658 return retval;
659 }
660
661 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
662 {
663 unsigned char c, *block;
664
665 block = edid + EDID_STRUCT_DISPLAY;
666
667 fb_get_monitor_limits(edid, specs);
668
669 c = block[0] & 0x80;
670 specs->input = 0;
671 if (c) {
672 specs->input |= FB_DISP_DDI;
673 DPRINTK(" Digital Display Input");
674 } else {
675 DPRINTK(" Analog Display Input: Input Voltage - ");
676 switch ((block[0] & 0x60) >> 5) {
677 case 0:
678 DPRINTK("0.700V/0.300V");
679 specs->input |= FB_DISP_ANA_700_300;
680 break;
681 case 1:
682 DPRINTK("0.714V/0.286V");
683 specs->input |= FB_DISP_ANA_714_286;
684 break;
685 case 2:
686 DPRINTK("1.000V/0.400V");
687 specs->input |= FB_DISP_ANA_1000_400;
688 break;
689 case 3:
690 DPRINTK("0.700V/0.000V");
691 specs->input |= FB_DISP_ANA_700_000;
692 break;
693 }
694 }
695 DPRINTK("\n Sync: ");
696 c = block[0] & 0x10;
697 if (c)
698 DPRINTK(" Configurable signal level\n");
699 c = block[0] & 0x0f;
700 specs->signal = 0;
701 if (c & 0x10) {
702 DPRINTK("Blank to Blank ");
703 specs->signal |= FB_SIGNAL_BLANK_BLANK;
704 }
705 if (c & 0x08) {
706 DPRINTK("Separate ");
707 specs->signal |= FB_SIGNAL_SEPARATE;
708 }
709 if (c & 0x04) {
710 DPRINTK("Composite ");
711 specs->signal |= FB_SIGNAL_COMPOSITE;
712 }
713 if (c & 0x02) {
714 DPRINTK("Sync on Green ");
715 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
716 }
717 if (c & 0x01) {
718 DPRINTK("Serration on ");
719 specs->signal |= FB_SIGNAL_SERRATION_ON;
720 }
721 DPRINTK("\n");
722 specs->max_x = block[1];
723 specs->max_y = block[2];
724 DPRINTK(" Max H-size in cm: ");
725 if (specs->max_x)
726 DPRINTK("%d\n", specs->max_x);
727 else
728 DPRINTK("variable\n");
729 DPRINTK(" Max V-size in cm: ");
730 if (specs->max_y)
731 DPRINTK("%d\n", specs->max_y);
732 else
733 DPRINTK("variable\n");
734
735 c = block[3];
736 specs->gamma = c+100;
737 DPRINTK(" Gamma: ");
738 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
739
740 get_dpms_capabilities(block[4], specs);
741
742 switch ((block[4] & 0x18) >> 3) {
743 case 0:
744 DPRINTK(" Monochrome/Grayscale\n");
745 specs->input |= FB_DISP_MONO;
746 break;
747 case 1:
748 DPRINTK(" RGB Color Display\n");
749 specs->input |= FB_DISP_RGB;
750 break;
751 case 2:
752 DPRINTK(" Non-RGB Multicolor Display\n");
753 specs->input |= FB_DISP_MULTI;
754 break;
755 default:
756 DPRINTK(" Unknown\n");
757 specs->input |= FB_DISP_UNKNOWN;
758 break;
759 }
760
761 get_chroma(block, specs);
762
763 specs->misc = 0;
764 c = block[4] & 0x7;
765 if (c & 0x04) {
766 DPRINTK(" Default color format is primary\n");
767 specs->misc |= FB_MISC_PRIM_COLOR;
768 }
769 if (c & 0x02) {
770 DPRINTK(" First DETAILED Timing is preferred\n");
771 specs->misc |= FB_MISC_1ST_DETAIL;
772 }
773 if (c & 0x01) {
774 printk(" Display is GTF capable\n");
775 specs->gtf = 1;
776 }
777 }
778
779 static int edid_is_timing_block(unsigned char *block)
780 {
781 if ((block[0] != 0x00) || (block[1] != 0x00) ||
782 (block[2] != 0x00) || (block[4] != 0x00))
783 return 1;
784 else
785 return 0;
786 }
787
788 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
789 {
790 int i;
791 unsigned char *block;
792
793 if (edid == NULL || var == NULL)
794 return 1;
795
796 if (!(edid_checksum(edid)))
797 return 1;
798
799 if (!(edid_check_header(edid)))
800 return 1;
801
802 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
803
804 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
805 if (edid_is_timing_block(block)) {
806 var->xres = var->xres_virtual = H_ACTIVE;
807 var->yres = var->yres_virtual = V_ACTIVE;
808 var->height = var->width = -1;
809 var->right_margin = H_SYNC_OFFSET;
810 var->left_margin = (H_ACTIVE + H_BLANKING) -
811 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
812 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
813 V_SYNC_WIDTH;
814 var->lower_margin = V_SYNC_OFFSET;
815 var->hsync_len = H_SYNC_WIDTH;
816 var->vsync_len = V_SYNC_WIDTH;
817 var->pixclock = PIXEL_CLOCK;
818 var->pixclock /= 1000;
819 var->pixclock = KHZ2PICOS(var->pixclock);
820
821 if (HSYNC_POSITIVE)
822 var->sync |= FB_SYNC_HOR_HIGH_ACT;
823 if (VSYNC_POSITIVE)
824 var->sync |= FB_SYNC_VERT_HIGH_ACT;
825 return 0;
826 }
827 }
828 return 1;
829 }
830
831 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
832 {
833 unsigned char *block;
834 int i, found = 0;
835
836 if (edid == NULL)
837 return;
838
839 if (!(edid_checksum(edid)))
840 return;
841
842 if (!(edid_check_header(edid)))
843 return;
844
845 memset(specs, 0, sizeof(struct fb_monspecs));
846
847 specs->version = edid[EDID_STRUCT_VERSION];
848 specs->revision = edid[EDID_STRUCT_REVISION];
849
850 DPRINTK("========================================\n");
851 DPRINTK("Display Information (EDID)\n");
852 DPRINTK("========================================\n");
853 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
854 (int) specs->revision);
855
856 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
857
858 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
859 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
860 if (edid_is_serial_block(block)) {
861 copy_string(block, specs->serial_no);
862 DPRINTK(" Serial Number: %s\n", specs->serial_no);
863 } else if (edid_is_ascii_block(block)) {
864 copy_string(block, specs->ascii);
865 DPRINTK(" ASCII Block: %s\n", specs->ascii);
866 } else if (edid_is_monitor_block(block)) {
867 copy_string(block, specs->monitor);
868 DPRINTK(" Monitor Name: %s\n", specs->monitor);
869 }
870 }
871
872 DPRINTK(" Display Characteristics:\n");
873 get_monspecs(edid, specs);
874
875 specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
876
877 /*
878 * Workaround for buggy EDIDs that sets that the first
879 * detailed timing is preferred but has not detailed
880 * timing specified
881 */
882 for (i = 0; i < specs->modedb_len; i++) {
883 if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
884 found = 1;
885 break;
886 }
887 }
888
889 if (!found)
890 specs->misc &= ~FB_MISC_1ST_DETAIL;
891
892 DPRINTK("========================================\n");
893 }
894
895 /*
896 * VESA Generalized Timing Formula (GTF)
897 */
898
899 #define FLYBACK 550
900 #define V_FRONTPORCH 1
901 #define H_OFFSET 40
902 #define H_SCALEFACTOR 20
903 #define H_BLANKSCALE 128
904 #define H_GRADIENT 600
905 #define C_VAL 30
906 #define M_VAL 300
907
908 struct __fb_timings {
909 u32 dclk;
910 u32 hfreq;
911 u32 vfreq;
912 u32 hactive;
913 u32 vactive;
914 u32 hblank;
915 u32 vblank;
916 u32 htotal;
917 u32 vtotal;
918 };
919
920 /**
921 * fb_get_vblank - get vertical blank time
922 * @hfreq: horizontal freq
923 *
924 * DESCRIPTION:
925 * vblank = right_margin + vsync_len + left_margin
926 *
927 * given: right_margin = 1 (V_FRONTPORCH)
928 * vsync_len = 3
929 * flyback = 550
930 *
931 * flyback * hfreq
932 * left_margin = --------------- - vsync_len
933 * 1000000
934 */
935 static u32 fb_get_vblank(u32 hfreq)
936 {
937 u32 vblank;
938
939 vblank = (hfreq * FLYBACK)/1000;
940 vblank = (vblank + 500)/1000;
941 return (vblank + V_FRONTPORCH);
942 }
943
944 /**
945 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
946 * @hfreq: horizontal freq
947 * @xres: horizontal resolution in pixels
948 *
949 * DESCRIPTION:
950 *
951 * xres * duty_cycle
952 * hblank = ------------------
953 * 100 - duty_cycle
954 *
955 * duty cycle = percent of htotal assigned to inactive display
956 * duty cycle = C - (M/Hfreq)
957 *
958 * where: C = ((offset - scale factor) * blank_scale)
959 * -------------------------------------- + scale factor
960 * 256
961 * M = blank_scale * gradient
962 *
963 */
964 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
965 {
966 u32 c_val, m_val, duty_cycle, hblank;
967
968 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
969 H_SCALEFACTOR) * 1000;
970 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
971 m_val = (m_val * 1000000)/hfreq;
972 duty_cycle = c_val - m_val;
973 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
974 return (hblank);
975 }
976
977 /**
978 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
979 * @dclk: pixelclock in Hz
980 * @xres: horizontal resolution in pixels
981 *
982 * DESCRIPTION:
983 *
984 * xres * duty_cycle
985 * hblank = ------------------
986 * 100 - duty_cycle
987 *
988 * duty cycle = percent of htotal assigned to inactive display
989 * duty cycle = C - (M * h_period)
990 *
991 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
992 * -----------------------------------------------
993 * 2 * M
994 * M = 300;
995 * C = 30;
996
997 */
998 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
999 {
1000 u32 duty_cycle, h_period, hblank;
1001
1002 dclk /= 1000;
1003 h_period = 100 - C_VAL;
1004 h_period *= h_period;
1005 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
1006 h_period *=10000;
1007
1008 h_period = int_sqrt(h_period);
1009 h_period -= (100 - C_VAL) * 100;
1010 h_period *= 1000;
1011 h_period /= 2 * M_VAL;
1012
1013 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
1014 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
1015 hblank &= ~15;
1016 return (hblank);
1017 }
1018
1019 /**
1020 * fb_get_hfreq - estimate hsync
1021 * @vfreq: vertical refresh rate
1022 * @yres: vertical resolution
1023 *
1024 * DESCRIPTION:
1025 *
1026 * (yres + front_port) * vfreq * 1000000
1027 * hfreq = -------------------------------------
1028 * (1000000 - (vfreq * FLYBACK)
1029 *
1030 */
1031
1032 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1033 {
1034 u32 divisor, hfreq;
1035
1036 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1037 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1038 return (hfreq/divisor);
1039 }
1040
1041 static void fb_timings_vfreq(struct __fb_timings *timings)
1042 {
1043 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1044 timings->vblank = fb_get_vblank(timings->hfreq);
1045 timings->vtotal = timings->vactive + timings->vblank;
1046 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1047 timings->hactive);
1048 timings->htotal = timings->hactive + timings->hblank;
1049 timings->dclk = timings->htotal * timings->hfreq;
1050 }
1051
1052 static void fb_timings_hfreq(struct __fb_timings *timings)
1053 {
1054 timings->vblank = fb_get_vblank(timings->hfreq);
1055 timings->vtotal = timings->vactive + timings->vblank;
1056 timings->vfreq = timings->hfreq/timings->vtotal;
1057 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1058 timings->hactive);
1059 timings->htotal = timings->hactive + timings->hblank;
1060 timings->dclk = timings->htotal * timings->hfreq;
1061 }
1062
1063 static void fb_timings_dclk(struct __fb_timings *timings)
1064 {
1065 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1066 timings->hactive);
1067 timings->htotal = timings->hactive + timings->hblank;
1068 timings->hfreq = timings->dclk/timings->htotal;
1069 timings->vblank = fb_get_vblank(timings->hfreq);
1070 timings->vtotal = timings->vactive + timings->vblank;
1071 timings->vfreq = timings->hfreq/timings->vtotal;
1072 }
1073
1074 /*
1075 * fb_get_mode - calculates video mode using VESA GTF
1076 * @flags: if: 0 - maximize vertical refresh rate
1077 * 1 - vrefresh-driven calculation;
1078 * 2 - hscan-driven calculation;
1079 * 3 - pixelclock-driven calculation;
1080 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1081 * @var: pointer to fb_var_screeninfo
1082 * @info: pointer to fb_info
1083 *
1084 * DESCRIPTION:
1085 * Calculates video mode based on monitor specs using VESA GTF.
1086 * The GTF is best for VESA GTF compliant monitors but is
1087 * specifically formulated to work for older monitors as well.
1088 *
1089 * If @flag==0, the function will attempt to maximize the
1090 * refresh rate. Otherwise, it will calculate timings based on
1091 * the flag and accompanying value.
1092 *
1093 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1094 * ignored and @var will be filled with the calculated timings.
1095 *
1096 * All calculations are based on the VESA GTF Spreadsheet
1097 * available at VESA's public ftp (http://www.vesa.org).
1098 *
1099 * NOTES:
1100 * The timings generated by the GTF will be different from VESA
1101 * DMT. It might be a good idea to keep a table of standard
1102 * VESA modes as well. The GTF may also not work for some displays,
1103 * such as, and especially, analog TV.
1104 *
1105 * REQUIRES:
1106 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1107 */
1108 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1109 {
1110 struct __fb_timings *timings;
1111 u32 interlace = 1, dscan = 1;
1112 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
1113
1114
1115 timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
1116
1117 if (!timings)
1118 return -ENOMEM;
1119
1120 /*
1121 * If monspecs are invalid, use values that are enough
1122 * for 640x480@60
1123 */
1124 if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
1125 !info->monspecs.dclkmax ||
1126 info->monspecs.hfmax < info->monspecs.hfmin ||
1127 info->monspecs.vfmax < info->monspecs.vfmin ||
1128 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1129 hfmin = 29000; hfmax = 30000;
1130 vfmin = 60; vfmax = 60;
1131 dclkmin = 0; dclkmax = 25000000;
1132 } else {
1133 hfmin = info->monspecs.hfmin;
1134 hfmax = info->monspecs.hfmax;
1135 vfmin = info->monspecs.vfmin;
1136 vfmax = info->monspecs.vfmax;
1137 dclkmin = info->monspecs.dclkmin;
1138 dclkmax = info->monspecs.dclkmax;
1139 }
1140
1141 timings->hactive = var->xres;
1142 timings->vactive = var->yres;
1143 if (var->vmode & FB_VMODE_INTERLACED) {
1144 timings->vactive /= 2;
1145 interlace = 2;
1146 }
1147 if (var->vmode & FB_VMODE_DOUBLE) {
1148 timings->vactive *= 2;
1149 dscan = 2;
1150 }
1151
1152 switch (flags & ~FB_IGNOREMON) {
1153 case FB_MAXTIMINGS: /* maximize refresh rate */
1154 timings->hfreq = hfmax;
1155 fb_timings_hfreq(timings);
1156 if (timings->vfreq > vfmax) {
1157 timings->vfreq = vfmax;
1158 fb_timings_vfreq(timings);
1159 }
1160 if (timings->dclk > dclkmax) {
1161 timings->dclk = dclkmax;
1162 fb_timings_dclk(timings);
1163 }
1164 break;
1165 case FB_VSYNCTIMINGS: /* vrefresh driven */
1166 timings->vfreq = val;
1167 fb_timings_vfreq(timings);
1168 break;
1169 case FB_HSYNCTIMINGS: /* hsync driven */
1170 timings->hfreq = val;
1171 fb_timings_hfreq(timings);
1172 break;
1173 case FB_DCLKTIMINGS: /* pixelclock driven */
1174 timings->dclk = PICOS2KHZ(val) * 1000;
1175 fb_timings_dclk(timings);
1176 break;
1177 default:
1178 err = -EINVAL;
1179
1180 }
1181
1182 if (err || (!(flags & FB_IGNOREMON) &&
1183 (timings->vfreq < vfmin || timings->vfreq > vfmax ||
1184 timings->hfreq < hfmin || timings->hfreq > hfmax ||
1185 timings->dclk < dclkmin || timings->dclk > dclkmax))) {
1186 err = -EINVAL;
1187 } else {
1188 var->pixclock = KHZ2PICOS(timings->dclk/1000);
1189 var->hsync_len = (timings->htotal * 8)/100;
1190 var->right_margin = (timings->hblank/2) - var->hsync_len;
1191 var->left_margin = timings->hblank - var->right_margin -
1192 var->hsync_len;
1193 var->vsync_len = (3 * interlace)/dscan;
1194 var->lower_margin = (1 * interlace)/dscan;
1195 var->upper_margin = (timings->vblank * interlace)/dscan -
1196 (var->vsync_len + var->lower_margin);
1197 }
1198
1199 kfree(timings);
1200 return err;
1201 }
1202 #else
1203 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1204 {
1205 return 1;
1206 }
1207 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1208 {
1209 specs = NULL;
1210 }
1211 void fb_destroy_modedb(struct fb_videomode *modedb)
1212 {
1213 }
1214 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1215 struct fb_info *info)
1216 {
1217 return -EINVAL;
1218 }
1219 #endif /* CONFIG_FB_MODE_HELPERS */
1220
1221 /*
1222 * fb_validate_mode - validates var against monitor capabilities
1223 * @var: pointer to fb_var_screeninfo
1224 * @info: pointer to fb_info
1225 *
1226 * DESCRIPTION:
1227 * Validates video mode against monitor capabilities specified in
1228 * info->monspecs.
1229 *
1230 * REQUIRES:
1231 * A valid info->monspecs.
1232 */
1233 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1234 {
1235 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1236 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1237
1238 /*
1239 * If monspecs are invalid, use values that are enough
1240 * for 640x480@60
1241 */
1242 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1243 !info->monspecs.dclkmax ||
1244 info->monspecs.hfmax < info->monspecs.hfmin ||
1245 info->monspecs.vfmax < info->monspecs.vfmin ||
1246 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1247 hfmin = 29000; hfmax = 30000;
1248 vfmin = 60; vfmax = 60;
1249 dclkmin = 0; dclkmax = 25000000;
1250 } else {
1251 hfmin = info->monspecs.hfmin;
1252 hfmax = info->monspecs.hfmax;
1253 vfmin = info->monspecs.vfmin;
1254 vfmax = info->monspecs.vfmax;
1255 dclkmin = info->monspecs.dclkmin;
1256 dclkmax = info->monspecs.dclkmax;
1257 }
1258
1259 if (!var->pixclock)
1260 return -EINVAL;
1261 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1262
1263 htotal = var->xres + var->right_margin + var->hsync_len +
1264 var->left_margin;
1265 vtotal = var->yres + var->lower_margin + var->vsync_len +
1266 var->upper_margin;
1267
1268 if (var->vmode & FB_VMODE_INTERLACED)
1269 vtotal /= 2;
1270 if (var->vmode & FB_VMODE_DOUBLE)
1271 vtotal *= 2;
1272
1273 hfreq = pixclock/htotal;
1274 hfreq = (hfreq + 500) / 1000 * 1000;
1275
1276 vfreq = hfreq/vtotal;
1277
1278 return (vfreq < vfmin || vfreq > vfmax ||
1279 hfreq < hfmin || hfreq > hfmax ||
1280 pixclock < dclkmin || pixclock > dclkmax) ?
1281 -EINVAL : 0;
1282 }
1283
1284 #if defined(CONFIG_FB_FIRMWARE_EDID) && defined(__i386__)
1285 #include <linux/pci.h>
1286
1287 /*
1288 * We need to ensure that the EDID block is only returned for
1289 * the primary graphics adapter.
1290 */
1291
1292 const unsigned char *fb_firmware_edid(struct device *device)
1293 {
1294 struct pci_dev *dev = NULL;
1295 struct resource *res = NULL;
1296 unsigned char *edid = NULL;
1297
1298 if (device)
1299 dev = to_pci_dev(device);
1300
1301 if (dev)
1302 res = &dev->resource[PCI_ROM_RESOURCE];
1303
1304 if (res && res->flags & IORESOURCE_ROM_SHADOW)
1305 edid = edid_info.dummy;
1306
1307 return edid;
1308 }
1309 #else
1310 const unsigned char *fb_firmware_edid(struct device *device)
1311 {
1312 return NULL;
1313 }
1314 #endif
1315 EXPORT_SYMBOL(fb_firmware_edid);
1316
1317 EXPORT_SYMBOL(fb_parse_edid);
1318 EXPORT_SYMBOL(fb_edid_to_monspecs);
1319 EXPORT_SYMBOL(fb_get_mode);
1320 EXPORT_SYMBOL(fb_validate_mode);
1321 EXPORT_SYMBOL(fb_destroy_modedb);
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