WebSVN - shark - Rev 1618 - /shark/branches/xen/drivers/fb/modedb.c

/*
* linux/drivers/video/modedb.c -- Standard video mode database management
*
* Copyright (C) 1999 Geert Uytterhoeven
*
* 2001 - Documented with DocBook
* - Brad Douglas <brad@neruo.com>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/

#include <linuxcomp.h>

#include <linux/module.h>
#include <linux/tty.h>
#include <linux/fb.h>
#include <linux/sched.h>

#undef DEBUG

#define name_matches(v, s, l) \
((v).name && !strncmp((s), (v).name, (l)) && strlen((v).name) == (l))
#define res_matches(v, x, y) \
((v).xres == (x) && (v).yres == (y))

#ifdef DEBUG
#define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
#else
#define DPRINTK(fmt, args...)
#endif

const char *global_mode_option = NULL;

/*
* Standard video mode definitions (taken from XFree86)
*/

#define DEFAULT_MODEDB_INDEX 0

static const struct fb_videomode modedb[] __initdata = {
{
/* 640x400 @ 70 Hz, 31.5 kHz hsync */
NULL, 70, 640, 400, 39721, 40, 24, 39, 9, 96, 2,
0, FB_VMODE_NONINTERLACED
}, {
/* 640x480 @ 60 Hz, 31.5 kHz hsync */
NULL, 60, 640, 480, 39721, 40, 24, 32, 11, 96, 2,
0, FB_VMODE_NONINTERLACED
}, {
/* 800x600 @ 56 Hz, 35.15 kHz hsync */
NULL, 56, 800, 600, 27777, 128, 24, 22, 1, 72, 2,
0, FB_VMODE_NONINTERLACED
}, {
/* 1024x768 @ 87 Hz interlaced, 35.5 kHz hsync */
NULL, 87, 1024, 768, 22271, 56, 24, 33, 8, 160, 8,
0, FB_VMODE_INTERLACED
}, {
/* 640x400 @ 85 Hz, 37.86 kHz hsync */
NULL, 85, 640, 400, 31746, 96, 32, 41, 1, 64, 3,
FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
}, {
/* 640x480 @ 72 Hz, 36.5 kHz hsync */
NULL, 72, 640, 480, 31746, 144, 40, 30, 8, 40, 3,
0, FB_VMODE_NONINTERLACED
}, {
/* 640x480 @ 75 Hz, 37.50 kHz hsync */
NULL, 75, 640, 480, 31746, 120, 16, 16, 1, 64, 3,
0, FB_VMODE_NONINTERLACED
}, {
/* 800x600 @ 60 Hz, 37.8 kHz hsync */
NULL, 60, 800, 600, 25000, 88, 40, 23, 1, 128, 4,
FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
}, {
/* 640x480 @ 85 Hz, 43.27 kHz hsync */
NULL, 85, 640, 480, 27777, 80, 56, 25, 1, 56, 3,
0, FB_VMODE_NONINTERLACED
}, {
/* 1152x864 @ 89 Hz interlaced, 44 kHz hsync */
NULL, 69, 1152, 864, 15384, 96, 16, 110, 1, 216, 10,
0, FB_VMODE_INTERLACED
}, {
/* 800x600 @ 72 Hz, 48.0 kHz hsync */
NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
}, {
/* 1024x768 @ 60 Hz, 48.4 kHz hsync */
NULL, 60, 1024, 768, 15384, 168, 8, 29, 3, 144, 6,
0, FB_VMODE_NONINTERLACED
}, {
/* 640x480 @ 100 Hz, 53.01 kHz hsync */
NULL, 100, 640, 480, 21834, 96, 32, 36, 8, 96, 6,
0, FB_VMODE_NONINTERLACED
}, {
/* 1152x864 @ 60 Hz, 53.5 kHz hsync */
NULL, 60, 1152, 864, 11123, 208, 64, 16, 4, 256, 8,
0, FB_VMODE_NONINTERLACED
}, {
/* 800x600 @ 85 Hz, 55.84 kHz hsync */
NULL, 85, 800, 600, 16460, 160, 64, 36, 16, 64, 5,
0, FB_VMODE_NONINTERLACED
}, {
/* 1024x768 @ 70 Hz, 56.5 kHz hsync */
NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6,
0, FB_VMODE_NONINTERLACED
}, {
/* 1280x1024 @ 87 Hz interlaced, 51 kHz hsync */
NULL, 87, 1280, 1024, 12500, 56, 16, 128, 1, 216, 12,
0, FB_VMODE_INTERLACED
}, {
/* 800x600 @ 100 Hz, 64.02 kHz hsync */
NULL, 100, 800, 600, 14357, 160, 64, 30, 4, 64, 6,
0, FB_VMODE_NONINTERLACED
}, {
/* 1024x768 @ 76 Hz, 62.5 kHz hsync */
NULL, 76, 1024, 768, 11764, 208, 8, 36, 16, 120, 3,
0, FB_VMODE_NONINTERLACED
}, {
/* 1152x864 @ 70 Hz, 62.4 kHz hsync */
NULL, 70, 1152, 864, 10869, 106, 56, 20, 1, 160, 10,
0, FB_VMODE_NONINTERLACED
}, {
/* 1280x1024 @ 61 Hz, 64.2 kHz hsync */
NULL, 61, 1280, 1024, 9090, 200, 48, 26, 1, 184, 3,
0, FB_VMODE_NONINTERLACED
}, {
/* 1400x1050 @ 60Hz, 63.9 kHz hsync */
NULL, 68, 1400, 1050, 9259, 136, 40, 13, 1, 112, 3,
0, FB_VMODE_NONINTERLACED
}, {
/* 1400x1050 @ 75,107 Hz, 82,392 kHz +hsync +vsync*/
"LCD_XGA_75", 75, 1400, 1050, 9271, 120, 56, 13, 0, 112, 3,
FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
}, {
/* 1400x1050 @ 60 Hz, ? kHz +hsync +vsync*/
"LCD_XGA_60", 60, 1400, 1050, 9259, 128, 40, 12, 0, 112, 3,
FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
}, {
/* 1024x768 @ 85 Hz, 70.24 kHz hsync */
NULL, 85, 1024, 768, 10111, 192, 32, 34, 14, 160, 6,
0, FB_VMODE_NONINTERLACED
}, {
/* 1152x864 @ 78 Hz, 70.8 kHz hsync */
NULL, 78, 1152, 864, 9090, 228, 88, 32, 0, 84, 12,
0, FB_VMODE_NONINTERLACED
}, {
/* 1280x1024 @ 70 Hz, 74.59 kHz hsync */
NULL, 70, 1280, 1024, 7905, 224, 32, 28, 8, 160, 8,
0, FB_VMODE_NONINTERLACED
}, {
/* 1600x1200 @ 60Hz, 75.00 kHz hsync */
NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
}, {
/* 1152x864 @ 84 Hz, 76.0 kHz hsync */
NULL, 84, 1152, 864, 7407, 184, 312, 32, 0, 128, 12,
0, FB_VMODE_NONINTERLACED
}, {
/* 1280x1024 @ 74 Hz, 78.85 kHz hsync */
NULL, 74, 1280, 1024, 7407, 256, 32, 34, 3, 144, 3,
0, FB_VMODE_NONINTERLACED
}, {
/* 1024x768 @ 100Hz, 80.21 kHz hsync */
NULL, 100, 1024, 768, 8658, 192, 32, 21, 3, 192, 10,
0, FB_VMODE_NONINTERLACED
}, {
/* 1280x1024 @ 76 Hz, 81.13 kHz hsync */
NULL, 76, 1280, 1024, 7407, 248, 32, 34, 3, 104, 3,
0, FB_VMODE_NONINTERLACED
}, {
/* 1600x1200 @ 70 Hz, 87.50 kHz hsync */
NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3,
0, FB_VMODE_NONINTERLACED
}, {
/* 1152x864 @ 100 Hz, 89.62 kHz hsync */
NULL, 100, 1152, 864, 7264, 224, 32, 17, 2, 128, 19,
0, FB_VMODE_NONINTERLACED
}, {
/* 1280x1024 @ 85 Hz, 91.15 kHz hsync */
NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
}, {
/* 1600x1200 @ 75 Hz, 93.75 kHz hsync */
NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
}, {
/* 1600x1200 @ 85 Hz, 105.77 kHz hsync */
NULL, 85, 1600, 1200, 4545, 272, 16, 37, 4, 192, 3,
FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
}, {
/* 1280x1024 @ 100 Hz, 107.16 kHz hsync */
NULL, 100, 1280, 1024, 5502, 256, 32, 26, 7, 128, 15,
0, FB_VMODE_NONINTERLACED
}, {
/* 1800x1440 @ 64Hz, 96.15 kHz hsync */
NULL, 64, 1800, 1440, 4347, 304, 96, 46, 1, 192, 3,
FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
}, {
/* 1800x1440 @ 70Hz, 104.52 kHz hsync */
NULL, 70, 1800, 1440, 4000, 304, 96, 46, 1, 192, 3,
FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
}, {
/* 512x384 @ 78 Hz, 31.50 kHz hsync */
NULL, 78, 512, 384, 49603, 48, 16, 16, 1, 64, 3,
0, FB_VMODE_NONINTERLACED
}, {
/* 512x384 @ 85 Hz, 34.38 kHz hsync */
NULL, 85, 512, 384, 45454, 48, 16, 16, 1, 64, 3,
0, FB_VMODE_NONINTERLACED
}, {
/* 320x200 @ 70 Hz, 31.5 kHz hsync, 8:5 aspect ratio */
NULL, 70, 320, 200, 79440, 16, 16, 20, 4, 48, 1,
0, FB_VMODE_DOUBLE
}, {
/* 320x240 @ 60 Hz, 31.5 kHz hsync, 4:3 aspect ratio */
NULL, 60, 320, 240, 79440, 16, 16, 16, 5, 48, 1,
0, FB_VMODE_DOUBLE
}, {
/* 320x240 @ 72 Hz, 36.5 kHz hsync */
NULL, 72, 320, 240, 63492, 16, 16, 16, 4, 48, 2,
0, FB_VMODE_DOUBLE
}, {
/* 400x300 @ 56 Hz, 35.2 kHz hsync, 4:3 aspect ratio */
NULL, 56, 400, 300, 55555, 64, 16, 10, 1, 32, 1,
0, FB_VMODE_DOUBLE
}, {
/* 400x300 @ 60 Hz, 37.8 kHz hsync */
NULL, 60, 400, 300, 50000, 48, 16, 11, 1, 64, 2,
0, FB_VMODE_DOUBLE
}, {
/* 400x300 @ 72 Hz, 48.0 kHz hsync */
NULL, 72, 400, 300, 40000, 32, 24, 11, 19, 64, 3,
0, FB_VMODE_DOUBLE
}, {
/* 480x300 @ 56 Hz, 35.2 kHz hsync, 8:5 aspect ratio */
NULL, 56, 480, 300, 46176, 80, 16, 10, 1, 40, 1,
0, FB_VMODE_DOUBLE
}, {
/* 480x300 @ 60 Hz, 37.8 kHz hsync */
NULL, 60, 480, 300, 41858, 56, 16, 11, 1, 80, 2,
0, FB_VMODE_DOUBLE
}, {
/* 480x300 @ 63 Hz, 39.6 kHz hsync */
NULL, 63, 480, 300, 40000, 56, 16, 11, 1, 80, 2,
0, FB_VMODE_DOUBLE
}, {
/* 480x300 @ 72 Hz, 48.0 kHz hsync */
NULL, 72, 480, 300, 33386, 40, 24, 11, 19, 80, 3,
0, FB_VMODE_DOUBLE
},
};

const struct fb_videomode vesa_modes[] = {
/* 0 640x350-85 VESA */
{ NULL, 85, 640, 350, 31746, 96, 32, 60, 32, 64, 3,
FB_SYNC_HOR_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 1 640x400-85 VESA */
{ NULL, 85, 640, 400, 31746, 96, 32, 41, 01, 64, 3,
FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 2 720x400-85 VESA */
{ NULL, 85, 721, 400, 28169, 108, 36, 42, 01, 72, 3,
FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 3 640x480-60 VESA */
{ NULL, 60, 640, 480, 39682, 48, 16, 33, 10, 96, 2,
0, FB_VMODE_NONINTERLACED },
/* 4 640x480-72 VESA */
{ NULL, 72, 640, 480, 31746, 128, 24, 29, 9, 40, 2,
0, FB_VMODE_NONINTERLACED },
/* 5 640x480-75 VESA */
{ NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
0, FB_VMODE_NONINTERLACED },
/* 6 640x480-85 VESA */
{ NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
0, FB_VMODE_NONINTERLACED },
/* 7 800x600-56 VESA */
{ NULL, 56, 800, 600, 27777, 128, 24, 22, 01, 72, 2,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 8 800x600-60 VESA */
{ NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 9 800x600-72 VESA */
{ NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 10 800x600-75 VESA */
{ NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 11 800x600-85 VESA */
{ NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 12 1024x768i-43 VESA */
{ NULL, 53, 1024, 768, 22271, 56, 8, 41, 0, 176, 8,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_INTERLACED },
/* 13 1024x768-60 VESA */
{ NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
0, FB_VMODE_NONINTERLACED },
/* 14 1024x768-70 VESA */
{ NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6,
0, FB_VMODE_NONINTERLACED },
/* 15 1024x768-75 VESA */
{ NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 16 1024x768-85 VESA */
{ NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 17 1152x864-75 VESA */
{ NULL, 75, 1153, 864, 9259, 256, 64, 32, 1, 128, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 18 1280x960-60 VESA */
{ NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 19 1280x960-85 VESA */
{ NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 20 1280x1024-60 VESA */
{ NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 21 1280x1024-75 VESA */
{ NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 22 1280x1024-85 VESA */
{ NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 23 1600x1200-60 VESA */
{ NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 24 1600x1200-65 VESA */
{ NULL, 65, 1600, 1200, 5698, 304, 64, 46, 1, 192, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 25 1600x1200-70 VESA */
{ NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 26 1600x1200-75 VESA */
{ NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 27 1600x1200-85 VESA */
{ NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 28 1792x1344-60 VESA */
{ NULL, 60, 1792, 1344, 4882, 328, 128, 46, 1, 200, 3,
FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 29 1792x1344-75 VESA */
{ NULL, 75, 1792, 1344, 3831, 352, 96, 69, 1, 216, 3,
FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 30 1856x1392-60 VESA */
{ NULL, 60, 1856, 1392, 4580, 352, 96, 43, 1, 224, 3,
FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 31 1856x1392-75 VESA */
{ NULL, 75, 1856, 1392, 3472, 352, 128, 104, 1, 224, 3,
FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 32 1920x1440-60 VESA */
{ NULL, 60, 1920, 1440, 4273, 344, 128, 56, 1, 200, 3,
FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
/* 33 1920x1440-75 VESA */
{ NULL, 60, 1920, 1440, 3367, 352, 144, 56, 1, 224, 3,
FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
};

static int __init my_atoi(const char *name)
{
int val = 0;

for (;; name++) {
switch (*name) {
case '0'...'9':
val = 10*val+(*name-'0');
break;
default:
return val;
}
}
}

/**
* __fb_try_mode - test a video mode
* @var: frame buffer user defined part of display
* @info: frame buffer info structure
* @mode: frame buffer video mode structure
* @bpp: color depth in bits per pixel
*
* Tries a video mode to test it's validity for device @info.
*
* Returns 1 on success.
*
*/

int __fb_try_mode(struct fb_var_screeninfo *var, struct fb_info *info,
const struct fb_videomode *mode, unsigned int bpp)
{
int err = 1;

DPRINTK("Trying mode %s %dx%d-%d@%d\n", mode->name ? mode->name : "noname",
mode->xres, mode->yres, bpp, mode->refresh);
var->xres = mode->xres;
var->yres = mode->yres;
var->xres_virtual = mode->xres;
var->yres_virtual = mode->yres;
var->xoffset = 0;
var->yoffset = 0;
var->bits_per_pixel = bpp;
var->activate |= FB_ACTIVATE_TEST;
var->pixclock = mode->pixclock;
var->left_margin = mode->left_margin;
var->right_margin = mode->right_margin;
var->upper_margin = mode->upper_margin;
var->lower_margin = mode->lower_margin;
var->hsync_len = mode->hsync_len;
var->vsync_len = mode->vsync_len;
var->sync = mode->sync;
var->vmode = mode->vmode;
if (info->fbops->fb_check_var)
err = info->fbops->fb_check_var(var, info);
var->activate &= ~FB_ACTIVATE_TEST;
return !err;
}

/**
* fb_find_mode - finds a valid video mode
* @var: frame buffer user defined part of display
* @info: frame buffer info structure
* @mode_option: string video mode to find
* @db: video mode database
* @dbsize: size of @db
* @default_mode: default video mode to fall back to
* @default_bpp: default color depth in bits per pixel
*
* Finds a suitable video mode, starting with the specified mode
* in @mode_option with fallback to @default_mode. If
* @default_mode fails, all modes in the video mode database will
* be tried.
*
* Valid mode specifiers for @mode_option:
*
* <xres>x<yres>[-<bpp>][@<refresh>] or
* <name>[-<bpp>][@<refresh>]
*
* with <xres>, <yres>, <bpp> and <refresh> decimal numbers and
* <name> a string.
*
* NOTE: The passed struct @var is _not_ cleared! This allows you
* to supply values for e.g. the grayscale and accel_flags fields.
*
* Returns zero for failure, 1 if using specified @mode_option,
* 2 if using specified @mode_option with an ignored refresh rate,
* 3 if default mode is used, 4 if fall back to any valid mode.
*
*/

int __init fb_find_mode(struct fb_var_screeninfo *var,
struct fb_info *info, const char *mode_option,
const struct fb_videomode *db, unsigned int dbsize,
const struct fb_videomode *default_mode,
unsigned int default_bpp)
{
int i, j;

/* Set up defaults */
if (!db) {
db = modedb;
dbsize = sizeof(modedb)/sizeof(*modedb);
}
if (!default_mode)
default_mode = &modedb[DEFAULT_MODEDB_INDEX];
if (!default_bpp)
default_bpp = 8;

/* Did the user specify a video mode? */
if (mode_option || (mode_option = global_mode_option)) {
const char *name = mode_option;
unsigned int namelen = strlen(name);
int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
unsigned int xres = 0, yres = 0, bpp = default_bpp, refresh = 0;
int yres_specified = 0;

for (i = namelen-1; i >= 0; i--) {
switch (name[i]) {
case '@':
namelen = i;
if (!refresh_specified && !bpp_specified &&
!yres_specified) {
refresh = my_atoi(&name[i+1]);
refresh_specified = 1;
} else
goto done;
break;
case '-':
namelen = i;
if (!bpp_specified && !yres_specified) {
bpp = my_atoi(&name[i+1]);
bpp_specified = 1;
} else
goto done;
break;
case 'x':
if (!yres_specified) {
yres = my_atoi(&name[i+1]);
yres_specified = 1;
} else
goto done;
break;
case '0'...'9':
break;
default:
goto done;
}
}
if (i < 0 && yres_specified) {
xres = my_atoi(name);
res_specified = 1;
}
done:
for (i = refresh_specified; i >= 0; i--) {
DPRINTK("Trying specified video mode%s\n",
i ? "" : " (ignoring refresh rate)");
for (j = 0; j < dbsize; j++)
if ((name_matches(db[j], name, namelen) ||
(res_specified && res_matches(db[j], xres, yres))) &&
(!i || db[j].refresh == refresh) &&
__fb_try_mode(var, info, &db[j], bpp))
return 2-i;
}
}

DPRINTK("Trying default video mode\n");
if (__fb_try_mode(var, info, default_mode, default_bpp))
return 3;

DPRINTK("Trying all modes\n");
for (i = 0; i < dbsize; i++)
if (__fb_try_mode(var, info, &db[i], default_bpp))
return 4;

DPRINTK("No valid mode found\n");
return 0;
}

EXPORT_SYMBOL(__fb_try_mode);
EXPORT_SYMBOL(vesa_modes);

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(root)/shark/branches/xen/drivers/fb/modedb.c @ 1627 - Rev 1618