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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / fbmon.c
blob978def0135879836f8cd711356c7ac6b1b3f6f1f
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 #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, struct fb_videomode *mode)
318 {
319 struct fb_var_screeninfo var;
320 struct fb_info info;
321
322 var.xres = xres;
323 var.yres = yres;
324 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
325 refresh, &var, &info);
326 mode->xres = xres;
327 mode->yres = yres;
328 mode->pixclock = var.pixclock;
329 mode->refresh = refresh;
330 mode->left_margin = var.left_margin;
331 mode->right_margin = var.right_margin;
332 mode->upper_margin = var.upper_margin;
333 mode->lower_margin = var.lower_margin;
334 mode->hsync_len = var.hsync_len;
335 mode->vsync_len = var.vsync_len;
336 mode->vmode = 0;
337 mode->sync = 0;
338 }
339
340 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
341 {
342 int num = 0;
343 unsigned char c;
344
345 c = block[0];
346 if (c&0x80) {
347 calc_mode_timings(720, 400, 70, &mode[num]);
348 mode[num++].flag = FB_MODE_IS_CALCULATED;
349 DPRINTK(" 720x400@70Hz\n");
350 }
351 if (c&0x40) {
352 calc_mode_timings(720, 400, 88, &mode[num]);
353 mode[num++].flag = FB_MODE_IS_CALCULATED;
354 DPRINTK(" 720x400@88Hz\n");
355 }
356 if (c&0x20) {
357 mode[num++] = vesa_modes[3];
358 DPRINTK(" 640x480@60Hz\n");
359 }
360 if (c&0x10) {
361 calc_mode_timings(640, 480, 67, &mode[num]);
362 mode[num++].flag = FB_MODE_IS_CALCULATED;
363 DPRINTK(" 640x480@67Hz\n");
364 }
365 if (c&0x08) {
366 mode[num++] = vesa_modes[4];
367 DPRINTK(" 640x480@72Hz\n");
368 }
369 if (c&0x04) {
370 mode[num++] = vesa_modes[5];
371 DPRINTK(" 640x480@75Hz\n");
372 }
373 if (c&0x02) {
374 mode[num++] = vesa_modes[7];
375 DPRINTK(" 800x600@56Hz\n");
376 }
377 if (c&0x01) {
378 mode[num++] = vesa_modes[8];
379 DPRINTK(" 800x600@60Hz\n");
380 }
381
382 c = block[1];
383 if (c&0x80) {
384 mode[num++] = vesa_modes[9];
385 DPRINTK(" 800x600@72Hz\n");
386 }
387 if (c&0x40) {
388 mode[num++] = vesa_modes[10];
389 DPRINTK(" 800x600@75Hz\n");
390 }
391 if (c&0x20) {
392 calc_mode_timings(832, 624, 75, &mode[num]);
393 mode[num++].flag = FB_MODE_IS_CALCULATED;
394 DPRINTK(" 832x624@75Hz\n");
395 }
396 if (c&0x10) {
397 mode[num++] = vesa_modes[12];
398 DPRINTK(" 1024x768@87Hz Interlaced\n");
399 }
400 if (c&0x08) {
401 mode[num++] = vesa_modes[13];
402 DPRINTK(" 1024x768@60Hz\n");
403 }
404 if (c&0x04) {
405 mode[num++] = vesa_modes[14];
406 DPRINTK(" 1024x768@70Hz\n");
407 }
408 if (c&0x02) {
409 mode[num++] = vesa_modes[15];
410 DPRINTK(" 1024x768@75Hz\n");
411 }
412 if (c&0x01) {
413 mode[num++] = vesa_modes[21];
414 DPRINTK(" 1280x1024@75Hz\n");
415 }
416 c = block[2];
417 if (c&0x80) {
418 mode[num++] = vesa_modes[17];
419 DPRINTK(" 1152x870@75Hz\n");
420 }
421 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
422 return num;
423 }
424
425 static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
426 {
427 int xres, yres = 0, refresh, ratio, i;
428
429 xres = (block[0] + 31) * 8;
430 if (xres <= 256)
431 return 0;
432
433 ratio = (block[1] & 0xc0) >> 6;
434 switch (ratio) {
435 case 0:
436 yres = xres;
437 break;
438 case 1:
439 yres = (xres * 3)/4;
440 break;
441 case 2:
442 yres = (xres * 4)/5;
443 break;
444 case 3:
445 yres = (xres * 9)/16;
446 break;
447 }
448 refresh = (block[1] & 0x3f) + 60;
449
450 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
451 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
452 if (vesa_modes[i].xres == xres &&
453 vesa_modes[i].yres == yres &&
454 vesa_modes[i].refresh == refresh) {
455 *mode = vesa_modes[i];
456 mode->flag |= FB_MODE_IS_STANDARD;
457 return 1;
458 }
459 }
460 calc_mode_timings(xres, yres, refresh, mode);
461 return 1;
462 }
463
464 static int get_dst_timing(unsigned char *block,
465 struct fb_videomode *mode)
466 {
467 int j, num = 0;
468
469 for (j = 0; j < 6; j++, block+= STD_TIMING_DESCRIPTION_SIZE)
470 num += get_std_timing(block, &mode[num]);
471
472 return num;
473 }
474
475 static void get_detailed_timing(unsigned char *block,
476 struct fb_videomode *mode)
477 {
478 mode->xres = H_ACTIVE;
479 mode->yres = V_ACTIVE;
480 mode->pixclock = PIXEL_CLOCK;
481 mode->pixclock /= 1000;
482 mode->pixclock = KHZ2PICOS(mode->pixclock);
483 mode->right_margin = H_SYNC_OFFSET;
484 mode->left_margin = (H_ACTIVE + H_BLANKING) -
485 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
486 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
487 V_SYNC_WIDTH;
488 mode->lower_margin = V_SYNC_OFFSET;
489 mode->hsync_len = H_SYNC_WIDTH;
490 mode->vsync_len = V_SYNC_WIDTH;
491 if (HSYNC_POSITIVE)
492 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
493 if (VSYNC_POSITIVE)
494 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
495 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
496 (V_ACTIVE + V_BLANKING));
497 mode->vmode = 0;
498 mode->flag = FB_MODE_IS_DETAILED;
499
500 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
501 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
502 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
503 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
504 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
505 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
506 (VSYNC_POSITIVE) ? "+" : "-");
507 }
508
509 /**
510 * fb_create_modedb - create video mode database
511 * @edid: EDID data
512 * @dbsize: database size
513 *
514 * RETURNS: struct fb_videomode, @dbsize contains length of database
515 *
516 * DESCRIPTION:
517 * This function builds a mode database using the contents of the EDID
518 * data
519 */
520 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
521 {
522 struct fb_videomode *mode, *m;
523 unsigned char *block;
524 int num = 0, i;
525
526 mode = kmalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
527 if (mode == NULL)
528 return NULL;
529 memset(mode, 0, 50 * sizeof(struct fb_videomode));
530
531 if (edid == NULL || !edid_checksum(edid) ||
532 !edid_check_header(edid)) {
533 kfree(mode);
534 return NULL;
535 }
536
537 *dbsize = 0;
538
539 DPRINTK(" Supported VESA Modes\n");
540 block = edid + ESTABLISHED_TIMING_1;
541 num += get_est_timing(block, &mode[num]);
542
543 DPRINTK(" Standard Timings\n");
544 block = edid + STD_TIMING_DESCRIPTIONS_START;
545 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
546 num += get_std_timing(block, &mode[num]);
547
548 DPRINTK(" Detailed Timings\n");
549 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
550 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
551 int first = 1;
552
553 if (block[0] == 0x00 && block[1] == 0x00) {
554 if (block[3] == 0xfa) {
555 num += get_dst_timing(block + 5, &mode[num]);
556 }
557 } else {
558 get_detailed_timing(block, &mode[num]);
559 if (first) {
560 mode[num].flag |= FB_MODE_IS_FIRST;
561 first = 0;
562 }
563 num++;
564 }
565 }
566
567 /* Yikes, EDID data is totally useless */
568 if (!num) {
569 kfree(mode);
570 return NULL;
571 }
572
573 *dbsize = num;
574 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
575 if (!m)
576 return mode;
577 memmove(m, mode, num * sizeof(struct fb_videomode));
578 kfree(mode);
579 return m;
580 }
581
582 /**
583 * fb_destroy_modedb - destroys mode database
584 * @modedb: mode database to destroy
585 *
586 * DESCRIPTION:
587 * Destroy mode database created by fb_create_modedb
588 */
589 void fb_destroy_modedb(struct fb_videomode *modedb)
590 {
591 kfree(modedb);
592 }
593
594 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
595 {
596 int i, retval = 1;
597 unsigned char *block;
598
599 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
600
601 DPRINTK(" Monitor Operating Limits: ");
602 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
603 if (edid_is_limits_block(block)) {
604 specs->hfmin = H_MIN_RATE * 1000;
605 specs->hfmax = H_MAX_RATE * 1000;
606 specs->vfmin = V_MIN_RATE;
607 specs->vfmax = V_MAX_RATE;
608 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
609 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
610 retval = 0;
611 DPRINTK("From EDID\n");
612 break;
613 }
614 }
615
616 /* estimate monitor limits based on modes supported */
617 if (retval) {
618 struct fb_videomode *modes;
619 int num_modes, i, hz, hscan, pixclock;
620
621 modes = fb_create_modedb(edid, &num_modes);
622 if (!modes) {
623 DPRINTK("None Available\n");
624 return 1;
625 }
626
627 retval = 0;
628 for (i = 0; i < num_modes; i++) {
629 hz = modes[i].refresh;
630 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
631 hscan = (modes[i].yres * 105 * hz + 5000)/100;
632
633 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
634 specs->dclkmax = pixclock;
635 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
636 specs->dclkmin = pixclock;
637 if (specs->hfmax == 0 || specs->hfmax < hscan)
638 specs->hfmax = hscan;
639 if (specs->hfmin == 0 || specs->hfmin > hscan)
640 specs->hfmin = hscan;
641 if (specs->vfmax == 0 || specs->vfmax < hz)
642 specs->vfmax = hz;
643 if (specs->vfmin == 0 || specs->vfmin > hz)
644 specs->vfmin = hz;
645 }
646 DPRINTK("Extrapolated\n");
647 fb_destroy_modedb(modes);
648 }
649 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
650 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
651 specs->vfmax, specs->dclkmax/1000000);
652 return retval;
653 }
654
655 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
656 {
657 unsigned char c, *block;
658
659 block = edid + EDID_STRUCT_DISPLAY;
660
661 fb_get_monitor_limits(edid, specs);
662
663 c = block[0] & 0x80;
664 specs->input = 0;
665 if (c) {
666 specs->input |= FB_DISP_DDI;
667 DPRINTK(" Digital Display Input");
668 } else {
669 DPRINTK(" Analog Display Input: Input Voltage - ");
670 switch ((block[0] & 0x60) >> 5) {
671 case 0:
672 DPRINTK("0.700V/0.300V");
673 specs->input |= FB_DISP_ANA_700_300;
674 break;
675 case 1:
676 DPRINTK("0.714V/0.286V");
677 specs->input |= FB_DISP_ANA_714_286;
678 break;
679 case 2:
680 DPRINTK("1.000V/0.400V");
681 specs->input |= FB_DISP_ANA_1000_400;
682 break;
683 case 3:
684 DPRINTK("0.700V/0.000V");
685 specs->input |= FB_DISP_ANA_700_000;
686 break;
687 }
688 }
689 DPRINTK("\n Sync: ");
690 c = block[0] & 0x10;
691 if (c)
692 DPRINTK(" Configurable signal level\n");
693 c = block[0] & 0x0f;
694 specs->signal = 0;
695 if (c & 0x10) {
696 DPRINTK("Blank to Blank ");
697 specs->signal |= FB_SIGNAL_BLANK_BLANK;
698 }
699 if (c & 0x08) {
700 DPRINTK("Separate ");
701 specs->signal |= FB_SIGNAL_SEPARATE;
702 }
703 if (c & 0x04) {
704 DPRINTK("Composite ");
705 specs->signal |= FB_SIGNAL_COMPOSITE;
706 }
707 if (c & 0x02) {
708 DPRINTK("Sync on Green ");
709 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
710 }
711 if (c & 0x01) {
712 DPRINTK("Serration on ");
713 specs->signal |= FB_SIGNAL_SERRATION_ON;
714 }
715 DPRINTK("\n");
716 specs->max_x = block[1];
717 specs->max_y = block[2];
718 DPRINTK(" Max H-size in cm: ");
719 if (specs->max_x)
720 DPRINTK("%d\n", specs->max_x);
721 else
722 DPRINTK("variable\n");
723 DPRINTK(" Max V-size in cm: ");
724 if (specs->max_y)
725 DPRINTK("%d\n", specs->max_y);
726 else
727 DPRINTK("variable\n");
728
729 c = block[3];
730 specs->gamma = c+100;
731 DPRINTK(" Gamma: ");
732 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
733
734 get_dpms_capabilities(block[4], specs);
735
736 switch ((block[4] & 0x18) >> 3) {
737 case 0:
738 DPRINTK(" Monochrome/Grayscale\n");
739 specs->input |= FB_DISP_MONO;
740 break;
741 case 1:
742 DPRINTK(" RGB Color Display\n");
743 specs->input |= FB_DISP_RGB;
744 break;
745 case 2:
746 DPRINTK(" Non-RGB Multicolor Display\n");
747 specs->input |= FB_DISP_MULTI;
748 break;
749 default:
750 DPRINTK(" Unknown\n");
751 specs->input |= FB_DISP_UNKNOWN;
752 break;
753 }
754
755 get_chroma(block, specs);
756
757 specs->misc = 0;
758 c = block[4] & 0x7;
759 if (c & 0x04) {
760 DPRINTK(" Default color format is primary\n");
761 specs->misc |= FB_MISC_PRIM_COLOR;
762 }
763 if (c & 0x02) {
764 DPRINTK(" First DETAILED Timing is preferred\n");
765 specs->misc |= FB_MISC_1ST_DETAIL;
766 }
767 if (c & 0x01) {
768 printk(" Display is GTF capable\n");
769 specs->gtf = 1;
770 }
771 }
772
773 static int edid_is_timing_block(unsigned char *block)
774 {
775 if ((block[0] != 0x00) || (block[1] != 0x00) ||
776 (block[2] != 0x00) || (block[4] != 0x00))
777 return 1;
778 else
779 return 0;
780 }
781
782 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
783 {
784 int i;
785 unsigned char *block;
786
787 if (edid == NULL || var == NULL)
788 return 1;
789
790 if (!(edid_checksum(edid)))
791 return 1;
792
793 if (!(edid_check_header(edid)))
794 return 1;
795
796 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
797
798 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
799 if (edid_is_timing_block(block)) {
800 var->xres = var->xres_virtual = H_ACTIVE;
801 var->yres = var->yres_virtual = V_ACTIVE;
802 var->height = var->width = -1;
803 var->right_margin = H_SYNC_OFFSET;
804 var->left_margin = (H_ACTIVE + H_BLANKING) -
805 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
806 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
807 V_SYNC_WIDTH;
808 var->lower_margin = V_SYNC_OFFSET;
809 var->hsync_len = H_SYNC_WIDTH;
810 var->vsync_len = V_SYNC_WIDTH;
811 var->pixclock = PIXEL_CLOCK;
812 var->pixclock /= 1000;
813 var->pixclock = KHZ2PICOS(var->pixclock);
814
815 if (HSYNC_POSITIVE)
816 var->sync |= FB_SYNC_HOR_HIGH_ACT;
817 if (VSYNC_POSITIVE)
818 var->sync |= FB_SYNC_VERT_HIGH_ACT;
819 return 0;
820 }
821 }
822 return 1;
823 }
824
825 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
826 {
827 unsigned char *block;
828 int i;
829
830 if (edid == NULL)
831 return;
832
833 if (!(edid_checksum(edid)))
834 return;
835
836 if (!(edid_check_header(edid)))
837 return;
838
839 memset(specs, 0, sizeof(struct fb_monspecs));
840
841 specs->version = edid[EDID_STRUCT_VERSION];
842 specs->revision = edid[EDID_STRUCT_REVISION];
843
844 DPRINTK("========================================\n");
845 DPRINTK("Display Information (EDID)\n");
846 DPRINTK("========================================\n");
847 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
848 (int) specs->revision);
849
850 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
851
852 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
853 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
854 if (edid_is_serial_block(block)) {
855 copy_string(block, specs->serial_no);
856 DPRINTK(" Serial Number: %s\n", specs->serial_no);
857 } else if (edid_is_ascii_block(block)) {
858 copy_string(block, specs->ascii);
859 DPRINTK(" ASCII Block: %s\n", specs->ascii);
860 } else if (edid_is_monitor_block(block)) {
861 copy_string(block, specs->monitor);
862 DPRINTK(" Monitor Name: %s\n", specs->monitor);
863 }
864 }
865
866 DPRINTK(" Display Characteristics:\n");
867 get_monspecs(edid, specs);
868
869 specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
870 DPRINTK("========================================\n");
871 }
872
873 /*
874 * VESA Generalized Timing Formula (GTF)
875 */
876
877 #define FLYBACK 550
878 #define V_FRONTPORCH 1
879 #define H_OFFSET 40
880 #define H_SCALEFACTOR 20
881 #define H_BLANKSCALE 128
882 #define H_GRADIENT 600
883 #define C_VAL 30
884 #define M_VAL 300
885
886 struct __fb_timings {
887 u32 dclk;
888 u32 hfreq;
889 u32 vfreq;
890 u32 hactive;
891 u32 vactive;
892 u32 hblank;
893 u32 vblank;
894 u32 htotal;
895 u32 vtotal;
896 };
897
898 /**
899 * fb_get_vblank - get vertical blank time
900 * @hfreq: horizontal freq
901 *
902 * DESCRIPTION:
903 * vblank = right_margin + vsync_len + left_margin
904 *
905 * given: right_margin = 1 (V_FRONTPORCH)
906 * vsync_len = 3
907 * flyback = 550
908 *
909 * flyback * hfreq
910 * left_margin = --------------- - vsync_len
911 * 1000000
912 */
913 static u32 fb_get_vblank(u32 hfreq)
914 {
915 u32 vblank;
916
917 vblank = (hfreq * FLYBACK)/1000;
918 vblank = (vblank + 500)/1000;
919 return (vblank + V_FRONTPORCH);
920 }
921
922 /**
923 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
924 * @hfreq: horizontal freq
925 * @xres: horizontal resolution in pixels
926 *
927 * DESCRIPTION:
928 *
929 * xres * duty_cycle
930 * hblank = ------------------
931 * 100 - duty_cycle
932 *
933 * duty cycle = percent of htotal assigned to inactive display
934 * duty cycle = C - (M/Hfreq)
935 *
936 * where: C = ((offset - scale factor) * blank_scale)
937 * -------------------------------------- + scale factor
938 * 256
939 * M = blank_scale * gradient
940 *
941 */
942 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
943 {
944 u32 c_val, m_val, duty_cycle, hblank;
945
946 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
947 H_SCALEFACTOR) * 1000;
948 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
949 m_val = (m_val * 1000000)/hfreq;
950 duty_cycle = c_val - m_val;
951 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
952 return (hblank);
953 }
954
955 /**
956 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
957 * @dclk: pixelclock in Hz
958 * @xres: horizontal resolution in pixels
959 *
960 * DESCRIPTION:
961 *
962 * xres * duty_cycle
963 * hblank = ------------------
964 * 100 - duty_cycle
965 *
966 * duty cycle = percent of htotal assigned to inactive display
967 * duty cycle = C - (M * h_period)
968 *
969 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
970 * -----------------------------------------------
971 * 2 * M
972 * M = 300;
973 * C = 30;
974
975 */
976 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
977 {
978 u32 duty_cycle, h_period, hblank;
979
980 dclk /= 1000;
981 h_period = 100 - C_VAL;
982 h_period *= h_period;
983 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
984 h_period *=10000;
985
986 h_period = int_sqrt(h_period);
987 h_period -= (100 - C_VAL) * 100;
988 h_period *= 1000;
989 h_period /= 2 * M_VAL;
990
991 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
992 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
993 hblank &= ~15;
994 return (hblank);
995 }
996
997 /**
998 * fb_get_hfreq - estimate hsync
999 * @vfreq: vertical refresh rate
1000 * @yres: vertical resolution
1001 *
1002 * DESCRIPTION:
1003 *
1004 * (yres + front_port) * vfreq * 1000000
1005 * hfreq = -------------------------------------
1006 * (1000000 - (vfreq * FLYBACK)
1007 *
1008 */
1009
1010 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1011 {
1012 u32 divisor, hfreq;
1013
1014 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1015 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1016 return (hfreq/divisor);
1017 }
1018
1019 static void fb_timings_vfreq(struct __fb_timings *timings)
1020 {
1021 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1022 timings->vblank = fb_get_vblank(timings->hfreq);
1023 timings->vtotal = timings->vactive + timings->vblank;
1024 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1025 timings->hactive);
1026 timings->htotal = timings->hactive + timings->hblank;
1027 timings->dclk = timings->htotal * timings->hfreq;
1028 }
1029
1030 static void fb_timings_hfreq(struct __fb_timings *timings)
1031 {
1032 timings->vblank = fb_get_vblank(timings->hfreq);
1033 timings->vtotal = timings->vactive + timings->vblank;
1034 timings->vfreq = timings->hfreq/timings->vtotal;
1035 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1036 timings->hactive);
1037 timings->htotal = timings->hactive + timings->hblank;
1038 timings->dclk = timings->htotal * timings->hfreq;
1039 }
1040
1041 static void fb_timings_dclk(struct __fb_timings *timings)
1042 {
1043 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1044 timings->hactive);
1045 timings->htotal = timings->hactive + timings->hblank;
1046 timings->hfreq = timings->dclk/timings->htotal;
1047 timings->vblank = fb_get_vblank(timings->hfreq);
1048 timings->vtotal = timings->vactive + timings->vblank;
1049 timings->vfreq = timings->hfreq/timings->vtotal;
1050 }
1051
1052 /*
1053 * fb_get_mode - calculates video mode using VESA GTF
1054 * @flags: if: 0 - maximize vertical refresh rate
1055 * 1 - vrefresh-driven calculation;
1056 * 2 - hscan-driven calculation;
1057 * 3 - pixelclock-driven calculation;
1058 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1059 * @var: pointer to fb_var_screeninfo
1060 * @info: pointer to fb_info
1061 *
1062 * DESCRIPTION:
1063 * Calculates video mode based on monitor specs using VESA GTF.
1064 * The GTF is best for VESA GTF compliant monitors but is
1065 * specifically formulated to work for older monitors as well.
1066 *
1067 * If @flag==0, the function will attempt to maximize the
1068 * refresh rate. Otherwise, it will calculate timings based on
1069 * the flag and accompanying value.
1070 *
1071 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1072 * ignored and @var will be filled with the calculated timings.
1073 *
1074 * All calculations are based on the VESA GTF Spreadsheet
1075 * available at VESA's public ftp (http://www.vesa.org).
1076 *
1077 * NOTES:
1078 * The timings generated by the GTF will be different from VESA
1079 * DMT. It might be a good idea to keep a table of standard
1080 * VESA modes as well. The GTF may also not work for some displays,
1081 * such as, and especially, analog TV.
1082 *
1083 * REQUIRES:
1084 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1085 */
1086 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1087 {
1088 struct __fb_timings timings;
1089 u32 interlace = 1, dscan = 1;
1090 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1091
1092 /*
1093 * If monspecs are invalid, use values that are enough
1094 * for 640x480@60
1095 */
1096 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1097 !info->monspecs.dclkmax ||
1098 info->monspecs.hfmax < info->monspecs.hfmin ||
1099 info->monspecs.vfmax < info->monspecs.vfmin ||
1100 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1101 hfmin = 29000; hfmax = 30000;
1102 vfmin = 60; vfmax = 60;
1103 dclkmin = 0; dclkmax = 25000000;
1104 } else {
1105 hfmin = info->monspecs.hfmin;
1106 hfmax = info->monspecs.hfmax;
1107 vfmin = info->monspecs.vfmin;
1108 vfmax = info->monspecs.vfmax;
1109 dclkmin = info->monspecs.dclkmin;
1110 dclkmax = info->monspecs.dclkmax;
1111 }
1112
1113 memset(&timings, 0, sizeof(struct __fb_timings));
1114 timings.hactive = var->xres;
1115 timings.vactive = var->yres;
1116 if (var->vmode & FB_VMODE_INTERLACED) {
1117 timings.vactive /= 2;
1118 interlace = 2;
1119 }
1120 if (var->vmode & FB_VMODE_DOUBLE) {
1121 timings.vactive *= 2;
1122 dscan = 2;
1123 }
1124
1125 switch (flags & ~FB_IGNOREMON) {
1126 case FB_MAXTIMINGS: /* maximize refresh rate */
1127 timings.hfreq = hfmax;
1128 fb_timings_hfreq(&timings);
1129 if (timings.vfreq > vfmax) {
1130 timings.vfreq = vfmax;
1131 fb_timings_vfreq(&timings);
1132 }
1133 if (timings.dclk > dclkmax) {
1134 timings.dclk = dclkmax;
1135 fb_timings_dclk(&timings);
1136 }
1137 break;
1138 case FB_VSYNCTIMINGS: /* vrefresh driven */
1139 timings.vfreq = val;
1140 fb_timings_vfreq(&timings);
1141 break;
1142 case FB_HSYNCTIMINGS: /* hsync driven */
1143 timings.hfreq = val;
1144 fb_timings_hfreq(&timings);
1145 break;
1146 case FB_DCLKTIMINGS: /* pixelclock driven */
1147 timings.dclk = PICOS2KHZ(val) * 1000;
1148 fb_timings_dclk(&timings);
1149 break;
1150 default:
1151 return -EINVAL;
1152
1153 }
1154
1155 if (!(flags & FB_IGNOREMON) &&
1156 (timings.vfreq < vfmin || timings.vfreq > vfmax ||
1157 timings.hfreq < hfmin || timings.hfreq > hfmax ||
1158 timings.dclk < dclkmin || timings.dclk > dclkmax))
1159 return -EINVAL;
1160
1161 var->pixclock = KHZ2PICOS(timings.dclk/1000);
1162 var->hsync_len = (timings.htotal * 8)/100;
1163 var->right_margin = (timings.hblank/2) - var->hsync_len;
1164 var->left_margin = timings.hblank - var->right_margin - var->hsync_len;
1165
1166 var->vsync_len = (3 * interlace)/dscan;
1167 var->lower_margin = (1 * interlace)/dscan;
1168 var->upper_margin = (timings.vblank * interlace)/dscan -
1169 (var->vsync_len + var->lower_margin);
1170
1171 return 0;
1172 }
1173 #else
1174 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1175 {
1176 return 1;
1177 }
1178 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1179 {
1180 specs = NULL;
1181 }
1182 void fb_destroy_modedb(struct fb_videomode *modedb)
1183 {
1184 }
1185 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1186 struct fb_info *info)
1187 {
1188 return -EINVAL;
1189 }
1190 #endif /* CONFIG_FB_MODE_HELPERS */
1191
1192 /*
1193 * fb_validate_mode - validates var against monitor capabilities
1194 * @var: pointer to fb_var_screeninfo
1195 * @info: pointer to fb_info
1196 *
1197 * DESCRIPTION:
1198 * Validates video mode against monitor capabilities specified in
1199 * info->monspecs.
1200 *
1201 * REQUIRES:
1202 * A valid info->monspecs.
1203 */
1204 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1205 {
1206 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1207 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1208
1209 /*
1210 * If monspecs are invalid, use values that are enough
1211 * for 640x480@60
1212 */
1213 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1214 !info->monspecs.dclkmax ||
1215 info->monspecs.hfmax < info->monspecs.hfmin ||
1216 info->monspecs.vfmax < info->monspecs.vfmin ||
1217 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1218 hfmin = 29000; hfmax = 30000;
1219 vfmin = 60; vfmax = 60;
1220 dclkmin = 0; dclkmax = 25000000;
1221 } else {
1222 hfmin = info->monspecs.hfmin;
1223 hfmax = info->monspecs.hfmax;
1224 vfmin = info->monspecs.vfmin;
1225 vfmax = info->monspecs.vfmax;
1226 dclkmin = info->monspecs.dclkmin;
1227 dclkmax = info->monspecs.dclkmax;
1228 }
1229
1230 if (!var->pixclock)
1231 return -EINVAL;
1232 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1233
1234 htotal = var->xres + var->right_margin + var->hsync_len +
1235 var->left_margin;
1236 vtotal = var->yres + var->lower_margin + var->vsync_len +
1237 var->upper_margin;
1238
1239 if (var->vmode & FB_VMODE_INTERLACED)
1240 vtotal /= 2;
1241 if (var->vmode & FB_VMODE_DOUBLE)
1242 vtotal *= 2;
1243
1244 hfreq = pixclock/htotal;
1245 vfreq = hfreq/vtotal;
1246
1247 return (vfreq < vfmin || vfreq > vfmax ||
1248 hfreq < hfmin || hfreq > hfmax ||
1249 pixclock < dclkmin || pixclock > dclkmax) ?
1250 -EINVAL : 0;
1251 }
1252
1253 EXPORT_SYMBOL(fb_parse_edid);
1254 EXPORT_SYMBOL(fb_edid_to_monspecs);
1255
1256 EXPORT_SYMBOL(fb_get_mode);
1257 EXPORT_SYMBOL(fb_validate_mode);
1258 EXPORT_SYMBOL(fb_destroy_modedb);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree