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[PATCH] Kprobes: preempt_disable/enable() simplification
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / fbmon.c
blob713226cdf3c6b7a7ce0a247447d1909d05e57396
1 /*
2 * linux/drivers/video/fbmon.c
3 *
4 * Copyright (C) 2002 James Simmons <jsimmons@users.sf.net>
5 *
6 * Credits:
7 *
8 * The EDID Parser is a conglomeration from the following sources:
9 *
10 * 1. SciTech SNAP Graphics Architecture
11 * Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved.
12 *
13 * 2. XFree86 4.3.0, interpret_edid.c
14 * Copyright 1998 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE>
15 *
16 * 3. John Fremlin <vii@users.sourceforge.net> and
17 * Ani Joshi <ajoshi@unixbox.com>
18 *
19 * Generalized Timing Formula is derived from:
20 *
21 * GTF Spreadsheet by Andy Morrish (1/5/97)
22 * available at http://www.vesa.org
23 *
24 * This file is subject to the terms and conditions of the GNU General Public
25 * License. See the file COPYING in the main directory of this archive
26 * for more details.
27 *
28 */
29 #include <linux/tty.h>
30 #include <linux/fb.h>
31 #include <linux/module.h>
32 #include <video/edid.h>
33 #ifdef CONFIG_PPC_OF
34 #include <linux/pci.h>
35 #include <asm/prom.h>
36 #include <asm/pci-bridge.h>
37 #endif
38 #include "edid.h"
39
40 /*
41 * EDID parser
42 */
43
44 #undef DEBUG /* define this for verbose EDID parsing output */
45
46 #ifdef DEBUG
47 #define DPRINTK(fmt, args...) printk(fmt,## args)
48 #else
49 #define DPRINTK(fmt, args...)
50 #endif
51
52 #define FBMON_FIX_HEADER 1
53 #define FBMON_FIX_INPUT 2
54
55 #ifdef CONFIG_FB_MODE_HELPERS
56 struct broken_edid {
57 u8 manufacturer[4];
58 u32 model;
59 u32 fix;
60 };
61
62 static struct broken_edid brokendb[] = {
63 /* DEC FR-PCXAV-YZ */
64 {
65 .manufacturer = "DEC",
66 .model = 0x073a,
67 .fix = FBMON_FIX_HEADER,
68 },
69 /* ViewSonic PF775a */
70 {
71 .manufacturer = "VSC",
72 .model = 0x5a44,
73 .fix = FBMON_FIX_INPUT,
74 },
75 };
76
77 static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
78 0xff, 0xff, 0xff, 0x00
79 };
80
81 static void copy_string(unsigned char *c, unsigned char *s)
82 {
83 int i;
84 c = c + 5;
85 for (i = 0; (i < 13 && *c != 0x0A); i++)
86 *(s++) = *(c++);
87 *s = 0;
88 while (i-- && (*--s == 0x20)) *s = 0;
89 }
90
91 static int check_edid(unsigned char *edid)
92 {
93 unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
94 unsigned char *b;
95 u32 model;
96 int i, fix = 0, ret = 0;
97
98 manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
99 manufacturer[1] = ((block[0] & 0x03) << 3) +
100 ((block[1] & 0xe0) >> 5) + '@';
101 manufacturer[2] = (block[1] & 0x1f) + '@';
102 manufacturer[3] = 0;
103 model = block[2] + (block[3] << 8);
104
105 for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
106 if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
107 brokendb[i].model == model) {
108 printk("fbmon: The EDID Block of "
109 "Manufacturer: %s Model: 0x%x is known to "
110 "be broken,\n", manufacturer, model);
111 fix = brokendb[i].fix;
112 break;
113 }
114 }
115
116 switch (fix) {
117 case FBMON_FIX_HEADER:
118 for (i = 0; i < 8; i++) {
119 if (edid[i] != edid_v1_header[i])
120 ret = fix;
121 }
122 break;
123 case FBMON_FIX_INPUT:
124 b = edid + EDID_STRUCT_DISPLAY;
125 /* Only if display is GTF capable will
126 the input type be reset to analog */
127 if (b[4] & 0x01 && b[0] & 0x80)
128 ret = fix;
129 break;
130 }
131
132 return ret;
133 }
134
135 static void fix_edid(unsigned char *edid, int fix)
136 {
137 unsigned char *b;
138
139 switch (fix) {
140 case FBMON_FIX_HEADER:
141 printk("fbmon: trying a header reconstruct\n");
142 memcpy(edid, edid_v1_header, 8);
143 break;
144 case FBMON_FIX_INPUT:
145 printk("fbmon: trying to fix input type\n");
146 b = edid + EDID_STRUCT_DISPLAY;
147 b[0] &= ~0x80;
148 edid[127] += 0x80;
149 }
150 }
151
152 static int edid_checksum(unsigned char *edid)
153 {
154 unsigned char i, csum = 0, all_null = 0;
155 int err = 0, fix = check_edid(edid);
156
157 if (fix)
158 fix_edid(edid, fix);
159
160 for (i = 0; i < EDID_LENGTH; i++) {
161 csum += edid[i];
162 all_null |= edid[i];
163 }
164
165 if (csum == 0x00 && all_null) {
166 /* checksum passed, everything's good */
167 err = 1;
168 }
169
170 return err;
171 }
172
173 static int edid_check_header(unsigned char *edid)
174 {
175 int i, err = 1, fix = check_edid(edid);
176
177 if (fix)
178 fix_edid(edid, fix);
179
180 for (i = 0; i < 8; i++) {
181 if (edid[i] != edid_v1_header[i])
182 err = 0;
183 }
184
185 return err;
186 }
187
188 static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
189 {
190 specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
191 specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
192 ((block[1] & 0xe0) >> 5) + '@';
193 specs->manufacturer[2] = (block[1] & 0x1f) + '@';
194 specs->manufacturer[3] = 0;
195 specs->model = block[2] + (block[3] << 8);
196 specs->serial = block[4] + (block[5] << 8) +
197 (block[6] << 16) + (block[7] << 24);
198 specs->year = block[9] + 1990;
199 specs->week = block[8];
200 DPRINTK(" Manufacturer: %s\n", specs->manufacturer);
201 DPRINTK(" Model: %x\n", specs->model);
202 DPRINTK(" Serial#: %u\n", specs->serial);
203 DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);
204 }
205
206 static void get_dpms_capabilities(unsigned char flags,
207 struct fb_monspecs *specs)
208 {
209 specs->dpms = 0;
210 if (flags & DPMS_ACTIVE_OFF)
211 specs->dpms |= FB_DPMS_ACTIVE_OFF;
212 if (flags & DPMS_SUSPEND)
213 specs->dpms |= FB_DPMS_SUSPEND;
214 if (flags & DPMS_STANDBY)
215 specs->dpms |= FB_DPMS_STANDBY;
216 DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",
217 (flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
218 (flags & DPMS_SUSPEND) ? "yes" : "no",
219 (flags & DPMS_STANDBY) ? "yes" : "no");
220 }
221
222 static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
223 {
224 int tmp;
225
226 DPRINTK(" Chroma\n");
227 /* Chromaticity data */
228 tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
229 tmp *= 1000;
230 tmp += 512;
231 specs->chroma.redx = tmp/1024;
232 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
233
234 tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
235 tmp *= 1000;
236 tmp += 512;
237 specs->chroma.redy = tmp/1024;
238 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
239
240 tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
241 tmp *= 1000;
242 tmp += 512;
243 specs->chroma.greenx = tmp/1024;
244 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
245
246 tmp = (block[5] & 3) | (block[0xa] << 2);
247 tmp *= 1000;
248 tmp += 512;
249 specs->chroma.greeny = tmp/1024;
250 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
251
252 tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
253 tmp *= 1000;
254 tmp += 512;
255 specs->chroma.bluex = tmp/1024;
256 DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
257
258 tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
259 tmp *= 1000;
260 tmp += 512;
261 specs->chroma.bluey = tmp/1024;
262 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
263
264 tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
265 tmp *= 1000;
266 tmp += 512;
267 specs->chroma.whitex = tmp/1024;
268 DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
269
270 tmp = (block[6] & 3) | (block[0xe] << 2);
271 tmp *= 1000;
272 tmp += 512;
273 specs->chroma.whitey = tmp/1024;
274 DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
275 }
276
277 static int edid_is_serial_block(unsigned char *block)
278 {
279 if ((block[0] == 0x00) && (block[1] == 0x00) &&
280 (block[2] == 0x00) && (block[3] == 0xff) &&
281 (block[4] == 0x00))
282 return 1;
283 else
284 return 0;
285 }
286
287 static int edid_is_ascii_block(unsigned char *block)
288 {
289 if ((block[0] == 0x00) && (block[1] == 0x00) &&
290 (block[2] == 0x00) && (block[3] == 0xfe) &&
291 (block[4] == 0x00))
292 return 1;
293 else
294 return 0;
295 }
296
297 static int edid_is_limits_block(unsigned char *block)
298 {
299 if ((block[0] == 0x00) && (block[1] == 0x00) &&
300 (block[2] == 0x00) && (block[3] == 0xfd) &&
301 (block[4] == 0x00))
302 return 1;
303 else
304 return 0;
305 }
306
307 static int edid_is_monitor_block(unsigned char *block)
308 {
309 if ((block[0] == 0x00) && (block[1] == 0x00) &&
310 (block[2] == 0x00) && (block[3] == 0xfc) &&
311 (block[4] == 0x00))
312 return 1;
313 else
314 return 0;
315 }
316
317 static void calc_mode_timings(int xres, int yres, int refresh,
318 struct fb_videomode *mode)
319 {
320 struct fb_var_screeninfo var;
321 struct fb_info info;
322
323 memset(&var, 0, sizeof(struct fb_var_screeninfo));
324 var.xres = xres;
325 var.yres = yres;
326 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
327 refresh, &var, &info);
328 mode->xres = xres;
329 mode->yres = yres;
330 mode->pixclock = var.pixclock;
331 mode->refresh = refresh;
332 mode->left_margin = var.left_margin;
333 mode->right_margin = var.right_margin;
334 mode->upper_margin = var.upper_margin;
335 mode->lower_margin = var.lower_margin;
336 mode->hsync_len = var.hsync_len;
337 mode->vsync_len = var.vsync_len;
338 mode->vmode = 0;
339 mode->sync = 0;
340 }
341
342 static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
343 {
344 int num = 0;
345 unsigned char c;
346
347 c = block[0];
348 if (c&0x80) {
349 calc_mode_timings(720, 400, 70, &mode[num]);
350 mode[num++].flag = FB_MODE_IS_CALCULATED;
351 DPRINTK(" 720x400@70Hz\n");
352 }
353 if (c&0x40) {
354 calc_mode_timings(720, 400, 88, &mode[num]);
355 mode[num++].flag = FB_MODE_IS_CALCULATED;
356 DPRINTK(" 720x400@88Hz\n");
357 }
358 if (c&0x20) {
359 mode[num++] = vesa_modes[3];
360 DPRINTK(" 640x480@60Hz\n");
361 }
362 if (c&0x10) {
363 calc_mode_timings(640, 480, 67, &mode[num]);
364 mode[num++].flag = FB_MODE_IS_CALCULATED;
365 DPRINTK(" 640x480@67Hz\n");
366 }
367 if (c&0x08) {
368 mode[num++] = vesa_modes[4];
369 DPRINTK(" 640x480@72Hz\n");
370 }
371 if (c&0x04) {
372 mode[num++] = vesa_modes[5];
373 DPRINTK(" 640x480@75Hz\n");
374 }
375 if (c&0x02) {
376 mode[num++] = vesa_modes[7];
377 DPRINTK(" 800x600@56Hz\n");
378 }
379 if (c&0x01) {
380 mode[num++] = vesa_modes[8];
381 DPRINTK(" 800x600@60Hz\n");
382 }
383
384 c = block[1];
385 if (c&0x80) {
386 mode[num++] = vesa_modes[9];
387 DPRINTK(" 800x600@72Hz\n");
388 }
389 if (c&0x40) {
390 mode[num++] = vesa_modes[10];
391 DPRINTK(" 800x600@75Hz\n");
392 }
393 if (c&0x20) {
394 calc_mode_timings(832, 624, 75, &mode[num]);
395 mode[num++].flag = FB_MODE_IS_CALCULATED;
396 DPRINTK(" 832x624@75Hz\n");
397 }
398 if (c&0x10) {
399 mode[num++] = vesa_modes[12];
400 DPRINTK(" 1024x768@87Hz Interlaced\n");
401 }
402 if (c&0x08) {
403 mode[num++] = vesa_modes[13];
404 DPRINTK(" 1024x768@60Hz\n");
405 }
406 if (c&0x04) {
407 mode[num++] = vesa_modes[14];
408 DPRINTK(" 1024x768@70Hz\n");
409 }
410 if (c&0x02) {
411 mode[num++] = vesa_modes[15];
412 DPRINTK(" 1024x768@75Hz\n");
413 }
414 if (c&0x01) {
415 mode[num++] = vesa_modes[21];
416 DPRINTK(" 1280x1024@75Hz\n");
417 }
418 c = block[2];
419 if (c&0x80) {
420 mode[num++] = vesa_modes[17];
421 DPRINTK(" 1152x870@75Hz\n");
422 }
423 DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
424 return num;
425 }
426
427 static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
428 {
429 int xres, yres = 0, refresh, ratio, i;
430
431 xres = (block[0] + 31) * 8;
432 if (xres <= 256)
433 return 0;
434
435 ratio = (block[1] & 0xc0) >> 6;
436 switch (ratio) {
437 case 0:
438 yres = xres;
439 break;
440 case 1:
441 yres = (xres * 3)/4;
442 break;
443 case 2:
444 yres = (xres * 4)/5;
445 break;
446 case 3:
447 yres = (xres * 9)/16;
448 break;
449 }
450 refresh = (block[1] & 0x3f) + 60;
451
452 DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
453 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
454 if (vesa_modes[i].xres == xres &&
455 vesa_modes[i].yres == yres &&
456 vesa_modes[i].refresh == refresh) {
457 *mode = vesa_modes[i];
458 mode->flag |= FB_MODE_IS_STANDARD;
459 return 1;
460 }
461 }
462 calc_mode_timings(xres, yres, refresh, mode);
463 return 1;
464 }
465
466 static int get_dst_timing(unsigned char *block,
467 struct fb_videomode *mode)
468 {
469 int j, num = 0;
470
471 for (j = 0; j < 6; j++, block+= STD_TIMING_DESCRIPTION_SIZE)
472 num += get_std_timing(block, &mode[num]);
473
474 return num;
475 }
476
477 static void get_detailed_timing(unsigned char *block,
478 struct fb_videomode *mode)
479 {
480 mode->xres = H_ACTIVE;
481 mode->yres = V_ACTIVE;
482 mode->pixclock = PIXEL_CLOCK;
483 mode->pixclock /= 1000;
484 mode->pixclock = KHZ2PICOS(mode->pixclock);
485 mode->right_margin = H_SYNC_OFFSET;
486 mode->left_margin = (H_ACTIVE + H_BLANKING) -
487 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
488 mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
489 V_SYNC_WIDTH;
490 mode->lower_margin = V_SYNC_OFFSET;
491 mode->hsync_len = H_SYNC_WIDTH;
492 mode->vsync_len = V_SYNC_WIDTH;
493 if (HSYNC_POSITIVE)
494 mode->sync |= FB_SYNC_HOR_HIGH_ACT;
495 if (VSYNC_POSITIVE)
496 mode->sync |= FB_SYNC_VERT_HIGH_ACT;
497 mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
498 (V_ACTIVE + V_BLANKING));
499 mode->vmode = 0;
500 mode->flag = FB_MODE_IS_DETAILED;
501
502 DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
503 DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
504 H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
505 DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
506 V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
507 DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
508 (VSYNC_POSITIVE) ? "+" : "-");
509 }
510
511 /**
512 * fb_create_modedb - create video mode database
513 * @edid: EDID data
514 * @dbsize: database size
515 *
516 * RETURNS: struct fb_videomode, @dbsize contains length of database
517 *
518 * DESCRIPTION:
519 * This function builds a mode database using the contents of the EDID
520 * data
521 */
522 static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
523 {
524 struct fb_videomode *mode, *m;
525 unsigned char *block;
526 int num = 0, i;
527
528 mode = kmalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
529 if (mode == NULL)
530 return NULL;
531 memset(mode, 0, 50 * sizeof(struct fb_videomode));
532
533 if (edid == NULL || !edid_checksum(edid) ||
534 !edid_check_header(edid)) {
535 kfree(mode);
536 return NULL;
537 }
538
539 *dbsize = 0;
540
541 DPRINTK(" Supported VESA Modes\n");
542 block = edid + ESTABLISHED_TIMING_1;
543 num += get_est_timing(block, &mode[num]);
544
545 DPRINTK(" Standard Timings\n");
546 block = edid + STD_TIMING_DESCRIPTIONS_START;
547 for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
548 num += get_std_timing(block, &mode[num]);
549
550 DPRINTK(" Detailed Timings\n");
551 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
552 for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
553 int first = 1;
554
555 if (block[0] == 0x00 && block[1] == 0x00) {
556 if (block[3] == 0xfa) {
557 num += get_dst_timing(block + 5, &mode[num]);
558 }
559 } else {
560 get_detailed_timing(block, &mode[num]);
561 if (first) {
562 mode[num].flag |= FB_MODE_IS_FIRST;
563 first = 0;
564 }
565 num++;
566 }
567 }
568
569 /* Yikes, EDID data is totally useless */
570 if (!num) {
571 kfree(mode);
572 return NULL;
573 }
574
575 *dbsize = num;
576 m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
577 if (!m)
578 return mode;
579 memmove(m, mode, num * sizeof(struct fb_videomode));
580 kfree(mode);
581 return m;
582 }
583
584 /**
585 * fb_destroy_modedb - destroys mode database
586 * @modedb: mode database to destroy
587 *
588 * DESCRIPTION:
589 * Destroy mode database created by fb_create_modedb
590 */
591 void fb_destroy_modedb(struct fb_videomode *modedb)
592 {
593 kfree(modedb);
594 }
595
596 static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
597 {
598 int i, retval = 1;
599 unsigned char *block;
600
601 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
602
603 DPRINTK(" Monitor Operating Limits: ");
604 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
605 if (edid_is_limits_block(block)) {
606 specs->hfmin = H_MIN_RATE * 1000;
607 specs->hfmax = H_MAX_RATE * 1000;
608 specs->vfmin = V_MIN_RATE;
609 specs->vfmax = V_MAX_RATE;
610 specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
611 specs->gtf = (GTF_SUPPORT) ? 1 : 0;
612 retval = 0;
613 DPRINTK("From EDID\n");
614 break;
615 }
616 }
617
618 /* estimate monitor limits based on modes supported */
619 if (retval) {
620 struct fb_videomode *modes;
621 int num_modes, i, hz, hscan, pixclock;
622
623 modes = fb_create_modedb(edid, &num_modes);
624 if (!modes) {
625 DPRINTK("None Available\n");
626 return 1;
627 }
628
629 retval = 0;
630 for (i = 0; i < num_modes; i++) {
631 hz = modes[i].refresh;
632 pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
633 hscan = (modes[i].yres * 105 * hz + 5000)/100;
634
635 if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
636 specs->dclkmax = pixclock;
637 if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
638 specs->dclkmin = pixclock;
639 if (specs->hfmax == 0 || specs->hfmax < hscan)
640 specs->hfmax = hscan;
641 if (specs->hfmin == 0 || specs->hfmin > hscan)
642 specs->hfmin = hscan;
643 if (specs->vfmax == 0 || specs->vfmax < hz)
644 specs->vfmax = hz;
645 if (specs->vfmin == 0 || specs->vfmin > hz)
646 specs->vfmin = hz;
647 }
648 DPRINTK("Extrapolated\n");
649 fb_destroy_modedb(modes);
650 }
651 DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
652 specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
653 specs->vfmax, specs->dclkmax/1000000);
654 return retval;
655 }
656
657 static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
658 {
659 unsigned char c, *block;
660
661 block = edid + EDID_STRUCT_DISPLAY;
662
663 fb_get_monitor_limits(edid, specs);
664
665 c = block[0] & 0x80;
666 specs->input = 0;
667 if (c) {
668 specs->input |= FB_DISP_DDI;
669 DPRINTK(" Digital Display Input");
670 } else {
671 DPRINTK(" Analog Display Input: Input Voltage - ");
672 switch ((block[0] & 0x60) >> 5) {
673 case 0:
674 DPRINTK("0.700V/0.300V");
675 specs->input |= FB_DISP_ANA_700_300;
676 break;
677 case 1:
678 DPRINTK("0.714V/0.286V");
679 specs->input |= FB_DISP_ANA_714_286;
680 break;
681 case 2:
682 DPRINTK("1.000V/0.400V");
683 specs->input |= FB_DISP_ANA_1000_400;
684 break;
685 case 3:
686 DPRINTK("0.700V/0.000V");
687 specs->input |= FB_DISP_ANA_700_000;
688 break;
689 }
690 }
691 DPRINTK("\n Sync: ");
692 c = block[0] & 0x10;
693 if (c)
694 DPRINTK(" Configurable signal level\n");
695 c = block[0] & 0x0f;
696 specs->signal = 0;
697 if (c & 0x10) {
698 DPRINTK("Blank to Blank ");
699 specs->signal |= FB_SIGNAL_BLANK_BLANK;
700 }
701 if (c & 0x08) {
702 DPRINTK("Separate ");
703 specs->signal |= FB_SIGNAL_SEPARATE;
704 }
705 if (c & 0x04) {
706 DPRINTK("Composite ");
707 specs->signal |= FB_SIGNAL_COMPOSITE;
708 }
709 if (c & 0x02) {
710 DPRINTK("Sync on Green ");
711 specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
712 }
713 if (c & 0x01) {
714 DPRINTK("Serration on ");
715 specs->signal |= FB_SIGNAL_SERRATION_ON;
716 }
717 DPRINTK("\n");
718 specs->max_x = block[1];
719 specs->max_y = block[2];
720 DPRINTK(" Max H-size in cm: ");
721 if (specs->max_x)
722 DPRINTK("%d\n", specs->max_x);
723 else
724 DPRINTK("variable\n");
725 DPRINTK(" Max V-size in cm: ");
726 if (specs->max_y)
727 DPRINTK("%d\n", specs->max_y);
728 else
729 DPRINTK("variable\n");
730
731 c = block[3];
732 specs->gamma = c+100;
733 DPRINTK(" Gamma: ");
734 DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
735
736 get_dpms_capabilities(block[4], specs);
737
738 switch ((block[4] & 0x18) >> 3) {
739 case 0:
740 DPRINTK(" Monochrome/Grayscale\n");
741 specs->input |= FB_DISP_MONO;
742 break;
743 case 1:
744 DPRINTK(" RGB Color Display\n");
745 specs->input |= FB_DISP_RGB;
746 break;
747 case 2:
748 DPRINTK(" Non-RGB Multicolor Display\n");
749 specs->input |= FB_DISP_MULTI;
750 break;
751 default:
752 DPRINTK(" Unknown\n");
753 specs->input |= FB_DISP_UNKNOWN;
754 break;
755 }
756
757 get_chroma(block, specs);
758
759 specs->misc = 0;
760 c = block[4] & 0x7;
761 if (c & 0x04) {
762 DPRINTK(" Default color format is primary\n");
763 specs->misc |= FB_MISC_PRIM_COLOR;
764 }
765 if (c & 0x02) {
766 DPRINTK(" First DETAILED Timing is preferred\n");
767 specs->misc |= FB_MISC_1ST_DETAIL;
768 }
769 if (c & 0x01) {
770 printk(" Display is GTF capable\n");
771 specs->gtf = 1;
772 }
773 }
774
775 static int edid_is_timing_block(unsigned char *block)
776 {
777 if ((block[0] != 0x00) || (block[1] != 0x00) ||
778 (block[2] != 0x00) || (block[4] != 0x00))
779 return 1;
780 else
781 return 0;
782 }
783
784 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
785 {
786 int i;
787 unsigned char *block;
788
789 if (edid == NULL || var == NULL)
790 return 1;
791
792 if (!(edid_checksum(edid)))
793 return 1;
794
795 if (!(edid_check_header(edid)))
796 return 1;
797
798 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
799
800 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
801 if (edid_is_timing_block(block)) {
802 var->xres = var->xres_virtual = H_ACTIVE;
803 var->yres = var->yres_virtual = V_ACTIVE;
804 var->height = var->width = -1;
805 var->right_margin = H_SYNC_OFFSET;
806 var->left_margin = (H_ACTIVE + H_BLANKING) -
807 (H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
808 var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
809 V_SYNC_WIDTH;
810 var->lower_margin = V_SYNC_OFFSET;
811 var->hsync_len = H_SYNC_WIDTH;
812 var->vsync_len = V_SYNC_WIDTH;
813 var->pixclock = PIXEL_CLOCK;
814 var->pixclock /= 1000;
815 var->pixclock = KHZ2PICOS(var->pixclock);
816
817 if (HSYNC_POSITIVE)
818 var->sync |= FB_SYNC_HOR_HIGH_ACT;
819 if (VSYNC_POSITIVE)
820 var->sync |= FB_SYNC_VERT_HIGH_ACT;
821 return 0;
822 }
823 }
824 return 1;
825 }
826
827 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
828 {
829 unsigned char *block;
830 int i;
831
832 if (edid == NULL)
833 return;
834
835 if (!(edid_checksum(edid)))
836 return;
837
838 if (!(edid_check_header(edid)))
839 return;
840
841 memset(specs, 0, sizeof(struct fb_monspecs));
842
843 specs->version = edid[EDID_STRUCT_VERSION];
844 specs->revision = edid[EDID_STRUCT_REVISION];
845
846 DPRINTK("========================================\n");
847 DPRINTK("Display Information (EDID)\n");
848 DPRINTK("========================================\n");
849 DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
850 (int) specs->revision);
851
852 parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
853
854 block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
855 for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
856 if (edid_is_serial_block(block)) {
857 copy_string(block, specs->serial_no);
858 DPRINTK(" Serial Number: %s\n", specs->serial_no);
859 } else if (edid_is_ascii_block(block)) {
860 copy_string(block, specs->ascii);
861 DPRINTK(" ASCII Block: %s\n", specs->ascii);
862 } else if (edid_is_monitor_block(block)) {
863 copy_string(block, specs->monitor);
864 DPRINTK(" Monitor Name: %s\n", specs->monitor);
865 }
866 }
867
868 DPRINTK(" Display Characteristics:\n");
869 get_monspecs(edid, specs);
870
871 specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
872 DPRINTK("========================================\n");
873 }
874
875 /*
876 * VESA Generalized Timing Formula (GTF)
877 */
878
879 #define FLYBACK 550
880 #define V_FRONTPORCH 1
881 #define H_OFFSET 40
882 #define H_SCALEFACTOR 20
883 #define H_BLANKSCALE 128
884 #define H_GRADIENT 600
885 #define C_VAL 30
886 #define M_VAL 300
887
888 struct __fb_timings {
889 u32 dclk;
890 u32 hfreq;
891 u32 vfreq;
892 u32 hactive;
893 u32 vactive;
894 u32 hblank;
895 u32 vblank;
896 u32 htotal;
897 u32 vtotal;
898 };
899
900 /**
901 * fb_get_vblank - get vertical blank time
902 * @hfreq: horizontal freq
903 *
904 * DESCRIPTION:
905 * vblank = right_margin + vsync_len + left_margin
906 *
907 * given: right_margin = 1 (V_FRONTPORCH)
908 * vsync_len = 3
909 * flyback = 550
910 *
911 * flyback * hfreq
912 * left_margin = --------------- - vsync_len
913 * 1000000
914 */
915 static u32 fb_get_vblank(u32 hfreq)
916 {
917 u32 vblank;
918
919 vblank = (hfreq * FLYBACK)/1000;
920 vblank = (vblank + 500)/1000;
921 return (vblank + V_FRONTPORCH);
922 }
923
924 /**
925 * fb_get_hblank_by_freq - get horizontal blank time given hfreq
926 * @hfreq: horizontal freq
927 * @xres: horizontal resolution in pixels
928 *
929 * DESCRIPTION:
930 *
931 * xres * duty_cycle
932 * hblank = ------------------
933 * 100 - duty_cycle
934 *
935 * duty cycle = percent of htotal assigned to inactive display
936 * duty cycle = C - (M/Hfreq)
937 *
938 * where: C = ((offset - scale factor) * blank_scale)
939 * -------------------------------------- + scale factor
940 * 256
941 * M = blank_scale * gradient
942 *
943 */
944 static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
945 {
946 u32 c_val, m_val, duty_cycle, hblank;
947
948 c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
949 H_SCALEFACTOR) * 1000;
950 m_val = (H_BLANKSCALE * H_GRADIENT)/256;
951 m_val = (m_val * 1000000)/hfreq;
952 duty_cycle = c_val - m_val;
953 hblank = (xres * duty_cycle)/(100000 - duty_cycle);
954 return (hblank);
955 }
956
957 /**
958 * fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
959 * @dclk: pixelclock in Hz
960 * @xres: horizontal resolution in pixels
961 *
962 * DESCRIPTION:
963 *
964 * xres * duty_cycle
965 * hblank = ------------------
966 * 100 - duty_cycle
967 *
968 * duty cycle = percent of htotal assigned to inactive display
969 * duty cycle = C - (M * h_period)
970 *
971 * where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
972 * -----------------------------------------------
973 * 2 * M
974 * M = 300;
975 * C = 30;
976
977 */
978 static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
979 {
980 u32 duty_cycle, h_period, hblank;
981
982 dclk /= 1000;
983 h_period = 100 - C_VAL;
984 h_period *= h_period;
985 h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
986 h_period *=10000;
987
988 h_period = int_sqrt(h_period);
989 h_period -= (100 - C_VAL) * 100;
990 h_period *= 1000;
991 h_period /= 2 * M_VAL;
992
993 duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
994 hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
995 hblank &= ~15;
996 return (hblank);
997 }
998
999 /**
1000 * fb_get_hfreq - estimate hsync
1001 * @vfreq: vertical refresh rate
1002 * @yres: vertical resolution
1003 *
1004 * DESCRIPTION:
1005 *
1006 * (yres + front_port) * vfreq * 1000000
1007 * hfreq = -------------------------------------
1008 * (1000000 - (vfreq * FLYBACK)
1009 *
1010 */
1011
1012 static u32 fb_get_hfreq(u32 vfreq, u32 yres)
1013 {
1014 u32 divisor, hfreq;
1015
1016 divisor = (1000000 - (vfreq * FLYBACK))/1000;
1017 hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
1018 return (hfreq/divisor);
1019 }
1020
1021 static void fb_timings_vfreq(struct __fb_timings *timings)
1022 {
1023 timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
1024 timings->vblank = fb_get_vblank(timings->hfreq);
1025 timings->vtotal = timings->vactive + timings->vblank;
1026 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1027 timings->hactive);
1028 timings->htotal = timings->hactive + timings->hblank;
1029 timings->dclk = timings->htotal * timings->hfreq;
1030 }
1031
1032 static void fb_timings_hfreq(struct __fb_timings *timings)
1033 {
1034 timings->vblank = fb_get_vblank(timings->hfreq);
1035 timings->vtotal = timings->vactive + timings->vblank;
1036 timings->vfreq = timings->hfreq/timings->vtotal;
1037 timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
1038 timings->hactive);
1039 timings->htotal = timings->hactive + timings->hblank;
1040 timings->dclk = timings->htotal * timings->hfreq;
1041 }
1042
1043 static void fb_timings_dclk(struct __fb_timings *timings)
1044 {
1045 timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
1046 timings->hactive);
1047 timings->htotal = timings->hactive + timings->hblank;
1048 timings->hfreq = timings->dclk/timings->htotal;
1049 timings->vblank = fb_get_vblank(timings->hfreq);
1050 timings->vtotal = timings->vactive + timings->vblank;
1051 timings->vfreq = timings->hfreq/timings->vtotal;
1052 }
1053
1054 /*
1055 * fb_get_mode - calculates video mode using VESA GTF
1056 * @flags: if: 0 - maximize vertical refresh rate
1057 * 1 - vrefresh-driven calculation;
1058 * 2 - hscan-driven calculation;
1059 * 3 - pixelclock-driven calculation;
1060 * @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
1061 * @var: pointer to fb_var_screeninfo
1062 * @info: pointer to fb_info
1063 *
1064 * DESCRIPTION:
1065 * Calculates video mode based on monitor specs using VESA GTF.
1066 * The GTF is best for VESA GTF compliant monitors but is
1067 * specifically formulated to work for older monitors as well.
1068 *
1069 * If @flag==0, the function will attempt to maximize the
1070 * refresh rate. Otherwise, it will calculate timings based on
1071 * the flag and accompanying value.
1072 *
1073 * If FB_IGNOREMON bit is set in @flags, monitor specs will be
1074 * ignored and @var will be filled with the calculated timings.
1075 *
1076 * All calculations are based on the VESA GTF Spreadsheet
1077 * available at VESA's public ftp (http://www.vesa.org).
1078 *
1079 * NOTES:
1080 * The timings generated by the GTF will be different from VESA
1081 * DMT. It might be a good idea to keep a table of standard
1082 * VESA modes as well. The GTF may also not work for some displays,
1083 * such as, and especially, analog TV.
1084 *
1085 * REQUIRES:
1086 * A valid info->monspecs, otherwise 'safe numbers' will be used.
1087 */
1088 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
1089 {
1090 struct __fb_timings timings;
1091 u32 interlace = 1, dscan = 1;
1092 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1093
1094 /*
1095 * If monspecs are invalid, use values that are enough
1096 * for 640x480@60
1097 */
1098 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1099 !info->monspecs.dclkmax ||
1100 info->monspecs.hfmax < info->monspecs.hfmin ||
1101 info->monspecs.vfmax < info->monspecs.vfmin ||
1102 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1103 hfmin = 29000; hfmax = 30000;
1104 vfmin = 60; vfmax = 60;
1105 dclkmin = 0; dclkmax = 25000000;
1106 } else {
1107 hfmin = info->monspecs.hfmin;
1108 hfmax = info->monspecs.hfmax;
1109 vfmin = info->monspecs.vfmin;
1110 vfmax = info->monspecs.vfmax;
1111 dclkmin = info->monspecs.dclkmin;
1112 dclkmax = info->monspecs.dclkmax;
1113 }
1114
1115 memset(&timings, 0, sizeof(struct __fb_timings));
1116 timings.hactive = var->xres;
1117 timings.vactive = var->yres;
1118 if (var->vmode & FB_VMODE_INTERLACED) {
1119 timings.vactive /= 2;
1120 interlace = 2;
1121 }
1122 if (var->vmode & FB_VMODE_DOUBLE) {
1123 timings.vactive *= 2;
1124 dscan = 2;
1125 }
1126
1127 switch (flags & ~FB_IGNOREMON) {
1128 case FB_MAXTIMINGS: /* maximize refresh rate */
1129 timings.hfreq = hfmax;
1130 fb_timings_hfreq(&timings);
1131 if (timings.vfreq > vfmax) {
1132 timings.vfreq = vfmax;
1133 fb_timings_vfreq(&timings);
1134 }
1135 if (timings.dclk > dclkmax) {
1136 timings.dclk = dclkmax;
1137 fb_timings_dclk(&timings);
1138 }
1139 break;
1140 case FB_VSYNCTIMINGS: /* vrefresh driven */
1141 timings.vfreq = val;
1142 fb_timings_vfreq(&timings);
1143 break;
1144 case FB_HSYNCTIMINGS: /* hsync driven */
1145 timings.hfreq = val;
1146 fb_timings_hfreq(&timings);
1147 break;
1148 case FB_DCLKTIMINGS: /* pixelclock driven */
1149 timings.dclk = PICOS2KHZ(val) * 1000;
1150 fb_timings_dclk(&timings);
1151 break;
1152 default:
1153 return -EINVAL;
1154
1155 }
1156
1157 if (!(flags & FB_IGNOREMON) &&
1158 (timings.vfreq < vfmin || timings.vfreq > vfmax ||
1159 timings.hfreq < hfmin || timings.hfreq > hfmax ||
1160 timings.dclk < dclkmin || timings.dclk > dclkmax))
1161 return -EINVAL;
1162
1163 var->pixclock = KHZ2PICOS(timings.dclk/1000);
1164 var->hsync_len = (timings.htotal * 8)/100;
1165 var->right_margin = (timings.hblank/2) - var->hsync_len;
1166 var->left_margin = timings.hblank - var->right_margin - var->hsync_len;
1167
1168 var->vsync_len = (3 * interlace)/dscan;
1169 var->lower_margin = (1 * interlace)/dscan;
1170 var->upper_margin = (timings.vblank * interlace)/dscan -
1171 (var->vsync_len + var->lower_margin);
1172
1173 return 0;
1174 }
1175 #else
1176 int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
1177 {
1178 return 1;
1179 }
1180 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
1181 {
1182 specs = NULL;
1183 }
1184 void fb_destroy_modedb(struct fb_videomode *modedb)
1185 {
1186 }
1187 int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
1188 struct fb_info *info)
1189 {
1190 return -EINVAL;
1191 }
1192 #endif /* CONFIG_FB_MODE_HELPERS */
1193
1194 /*
1195 * fb_validate_mode - validates var against monitor capabilities
1196 * @var: pointer to fb_var_screeninfo
1197 * @info: pointer to fb_info
1198 *
1199 * DESCRIPTION:
1200 * Validates video mode against monitor capabilities specified in
1201 * info->monspecs.
1202 *
1203 * REQUIRES:
1204 * A valid info->monspecs.
1205 */
1206 int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
1207 {
1208 u32 hfreq, vfreq, htotal, vtotal, pixclock;
1209 u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
1210
1211 /*
1212 * If monspecs are invalid, use values that are enough
1213 * for 640x480@60
1214 */
1215 if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
1216 !info->monspecs.dclkmax ||
1217 info->monspecs.hfmax < info->monspecs.hfmin ||
1218 info->monspecs.vfmax < info->monspecs.vfmin ||
1219 info->monspecs.dclkmax < info->monspecs.dclkmin) {
1220 hfmin = 29000; hfmax = 30000;
1221 vfmin = 60; vfmax = 60;
1222 dclkmin = 0; dclkmax = 25000000;
1223 } else {
1224 hfmin = info->monspecs.hfmin;
1225 hfmax = info->monspecs.hfmax;
1226 vfmin = info->monspecs.vfmin;
1227 vfmax = info->monspecs.vfmax;
1228 dclkmin = info->monspecs.dclkmin;
1229 dclkmax = info->monspecs.dclkmax;
1230 }
1231
1232 if (!var->pixclock)
1233 return -EINVAL;
1234 pixclock = PICOS2KHZ(var->pixclock) * 1000;
1235
1236 htotal = var->xres + var->right_margin + var->hsync_len +
1237 var->left_margin;
1238 vtotal = var->yres + var->lower_margin + var->vsync_len +
1239 var->upper_margin;
1240
1241 if (var->vmode & FB_VMODE_INTERLACED)
1242 vtotal /= 2;
1243 if (var->vmode & FB_VMODE_DOUBLE)
1244 vtotal *= 2;
1245
1246 hfreq = pixclock/htotal;
1247 hfreq = (hfreq + 500) / 1000 * 1000;
1248
1249 vfreq = hfreq/vtotal;
1250
1251 return (vfreq < vfmin || vfreq > vfmax ||
1252 hfreq < hfmin || hfreq > hfmax ||
1253 pixclock < dclkmin || pixclock > dclkmax) ?
1254 -EINVAL : 0;
1255 }
1256
1257 #if defined(__i386__)
1258 #include <linux/pci.h>
1259
1260 /*
1261 * We need to ensure that the EDID block is only returned for
1262 * the primary graphics adapter.
1263 */
1264
1265 const unsigned char *fb_firmware_edid(struct device *device)
1266 {
1267 struct pci_dev *dev = NULL;
1268 struct resource *res = NULL;
1269 unsigned char *edid = NULL;
1270
1271 if (device)
1272 dev = to_pci_dev(device);
1273
1274 if (dev)
1275 res = &dev->resource[PCI_ROM_RESOURCE];
1276
1277 if (res && res->flags & IORESOURCE_ROM_SHADOW)
1278 edid = edid_info.dummy;
1279
1280 return edid;
1281 }
1282 #else
1283 const unsigned char *fb_firmware_edid(struct device *device)
1284 {
1285 return NULL;
1286 }
1287 #endif /* _i386_ */
1288
1289 EXPORT_SYMBOL(fb_parse_edid);
1290 EXPORT_SYMBOL(fb_edid_to_monspecs);
1291 EXPORT_SYMBOL(fb_firmware_edid);
1292 EXPORT_SYMBOL(fb_get_mode);
1293 EXPORT_SYMBOL(fb_validate_mode);
1294 EXPORT_SYMBOL(fb_destroy_modedb);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree