drivers/video/modedb.c

   1 /*
   2  *  linux/drivers/video/modedb.c -- Standard video mode database management
   3  *
   4  *      Copyright (C) 1999 Geert Uytterhoeven
   5  *
   6  *      2001 - Documented with DocBook
   7  *      - Brad Douglas <brad@neruo.com>
   8  *
   9  *  This file is subject to the terms and conditions of the GNU General Public
  10  *  License. See the file COPYING in the main directory of this archive for
  11  *  more details.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/tty.h>
  16 #include <linux/fb.h>
  17 #include <linux/sched.h>
  18
  19 #undef DEBUG
  20
  21 #define name_matches(v, s, l) \
  22     ((v).name && !strncmp((s), (v).name, (l)) && strlen((v).name) == (l))
  23 #define res_matches(v, x, y) \
  24     ((v).xres == (x) && (v).yres == (y))
  25
  26 #ifdef DEBUG
  27 #define DPRINTK(fmt, args...)   printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
  28 #else
  29 #define DPRINTK(fmt, args...)
  30 #endif
  31
  32
  33 const char *global_mode_option = NULL;
  34
  35
  36     /*
  37      *  Standard video mode definitions (taken from XFree86)
  38      */
  39
  40 #define DEFAULT_MODEDB_INDEX    0
  41
  42 static const struct fb_videomode modedb[] __initdata = {
  43     {
  44         /* 640x400 @ 70 Hz, 31.5 kHz hsync */
  45         NULL, 70, 640, 400, 39721, 40, 24, 39, 9, 96, 2,
  46         0, FB_VMODE_NONINTERLACED
  47     }, {
  48         /* 640x480 @ 60 Hz, 31.5 kHz hsync */
  49         NULL, 60, 640, 480, 39721, 40, 24, 32, 11, 96, 2,
  50         0, FB_VMODE_NONINTERLACED
  51     }, {
  52         /* 800x600 @ 56 Hz, 35.15 kHz hsync */
  53         NULL, 56, 800, 600, 27777, 128, 24, 22, 1, 72, 2,
  54         0, FB_VMODE_NONINTERLACED
  55     }, {
  56         /* 1024x768 @ 87 Hz interlaced, 35.5 kHz hsync */
  57         NULL, 87, 1024, 768, 22271, 56, 24, 33, 8, 160, 8,
  58         0, FB_VMODE_INTERLACED
  59     }, {
  60         /* 640x400 @ 85 Hz, 37.86 kHz hsync */
  61         NULL, 85, 640, 400, 31746, 96, 32, 41, 1, 64, 3,
  62         FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
  63     }, {
  64         /* 640x480 @ 72 Hz, 36.5 kHz hsync */
  65         NULL, 72, 640, 480, 31746, 144, 40, 30, 8, 40, 3,
  66         0, FB_VMODE_NONINTERLACED
  67     }, {
  68         /* 640x480 @ 75 Hz, 37.50 kHz hsync */
  69         NULL, 75, 640, 480, 31746, 120, 16, 16, 1, 64, 3,
  70         0, FB_VMODE_NONINTERLACED
  71     }, {
  72         /* 800x600 @ 60 Hz, 37.8 kHz hsync */
  73         NULL, 60, 800, 600, 25000, 88, 40, 23, 1, 128, 4,
  74         FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
  75     }, {
  76         /* 640x480 @ 85 Hz, 43.27 kHz hsync */
  77         NULL, 85, 640, 480, 27777, 80, 56, 25, 1, 56, 3,
  78         0, FB_VMODE_NONINTERLACED
  79     }, {
  80         /* 1152x864 @ 89 Hz interlaced, 44 kHz hsync */
  81         NULL, 69, 1152, 864, 15384, 96, 16, 110, 1, 216, 10,
  82         0, FB_VMODE_INTERLACED
  83     }, {
  84         /* 800x600 @ 72 Hz, 48.0 kHz hsync */
  85         NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
  86         FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
  87     }, {
  88         /* 1024x768 @ 60 Hz, 48.4 kHz hsync */
  89         NULL, 60, 1024, 768, 15384, 168, 8, 29, 3, 144, 6,
  90         0, FB_VMODE_NONINTERLACED
  91     }, {
  92         /* 640x480 @ 100 Hz, 53.01 kHz hsync */
  93         NULL, 100, 640, 480, 21834, 96, 32, 36, 8, 96, 6,
  94         0, FB_VMODE_NONINTERLACED
  95     }, {
  96         /* 1152x864 @ 60 Hz, 53.5 kHz hsync */
  97         NULL, 60, 1152, 864, 11123, 208, 64, 16, 4, 256, 8,
  98         0, FB_VMODE_NONINTERLACED
  99     }, {
 100         /* 800x600 @ 85 Hz, 55.84 kHz hsync */
 101         NULL, 85, 800, 600, 16460, 160, 64, 36, 16, 64, 5,
 102         0, FB_VMODE_NONINTERLACED
 103     }, {
 104         /* 1024x768 @ 70 Hz, 56.5 kHz hsync */
 105         NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6,
 106         0, FB_VMODE_NONINTERLACED
 107     }, {
 108         /* 1280x1024 @ 87 Hz interlaced, 51 kHz hsync */
 109         NULL, 87, 1280, 1024, 12500, 56, 16, 128, 1, 216, 12,
 110         0, FB_VMODE_INTERLACED
 111     }, {
 112         /* 800x600 @ 100 Hz, 64.02 kHz hsync */
 113         NULL, 100, 800, 600, 14357, 160, 64, 30, 4, 64, 6,
 114         0, FB_VMODE_NONINTERLACED
 115     }, {
 116         /* 1024x768 @ 76 Hz, 62.5 kHz hsync */
 117         NULL, 76, 1024, 768, 11764, 208, 8, 36, 16, 120, 3,
 118         0, FB_VMODE_NONINTERLACED
 119     }, {
 120         /* 1152x864 @ 70 Hz, 62.4 kHz hsync */
 121         NULL, 70, 1152, 864, 10869, 106, 56, 20, 1, 160, 10,
 122         0, FB_VMODE_NONINTERLACED
 123     }, {
 124         /* 1280x1024 @ 61 Hz, 64.2 kHz hsync */
 125         NULL, 61, 1280, 1024, 9090, 200, 48, 26, 1, 184, 3,
 126         0, FB_VMODE_NONINTERLACED
 127     }, {
 128         /* 1400x1050 @ 60Hz, 63.9 kHz hsync */
 129         NULL, 68, 1400, 1050, 9259, 136, 40, 13, 1, 112, 3,
 130         0, FB_VMODE_NONINTERLACED
 131     }, {
 132         /* 1400x1050 @ 75,107 Hz, 82,392 kHz +hsync +vsync*/
 133         "LCD_XGA_75", 75, 1400, 1050, 9271, 120, 56, 13, 0, 112, 3,
 134         FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
 135     }, {
 136         /* 1400x1050 @ 60 Hz, ? kHz +hsync +vsync*/
 137         "LCD_XGA_60", 60, 1400, 1050, 9259, 128, 40, 12, 0, 112, 3,
 138         FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
 139     }, {
 140         /* 1024x768 @ 85 Hz, 70.24 kHz hsync */
 141         NULL, 85, 1024, 768, 10111, 192, 32, 34, 14, 160, 6,
 142         0, FB_VMODE_NONINTERLACED
 143     }, {
 144         /* 1152x864 @ 78 Hz, 70.8 kHz hsync */
 145         NULL, 78, 1152, 864, 9090, 228, 88, 32, 0, 84, 12,
 146         0, FB_VMODE_NONINTERLACED
 147     }, {
 148         /* 1280x1024 @ 70 Hz, 74.59 kHz hsync */
 149         NULL, 70, 1280, 1024, 7905, 224, 32, 28, 8, 160, 8,
 150         0, FB_VMODE_NONINTERLACED
 151     }, {
 152         /* 1600x1200 @ 60Hz, 75.00 kHz hsync */
 153         NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
 154         FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
 155     }, {
 156         /* 1152x864 @ 84 Hz, 76.0 kHz hsync */
 157         NULL, 84, 1152, 864, 7407, 184, 312, 32, 0, 128, 12,
 158         0, FB_VMODE_NONINTERLACED
 159     }, {
 160         /* 1280x1024 @ 74 Hz, 78.85 kHz hsync */
 161         NULL, 74, 1280, 1024, 7407, 256, 32, 34, 3, 144, 3,
 162         0, FB_VMODE_NONINTERLACED
 163     }, {
 164         /* 1024x768 @ 100Hz, 80.21 kHz hsync */
 165         NULL, 100, 1024, 768, 8658, 192, 32, 21, 3, 192, 10,
 166         0, FB_VMODE_NONINTERLACED
 167     }, {
 168         /* 1280x1024 @ 76 Hz, 81.13 kHz hsync */
 169         NULL, 76, 1280, 1024, 7407, 248, 32, 34, 3, 104, 3,
 170         0, FB_VMODE_NONINTERLACED
 171     }, {
 172         /* 1600x1200 @ 70 Hz, 87.50 kHz hsync */
 173         NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3,
 174         0, FB_VMODE_NONINTERLACED
 175     }, {
 176         /* 1152x864 @ 100 Hz, 89.62 kHz hsync */
 177         NULL, 100, 1152, 864, 7264, 224, 32, 17, 2, 128, 19,
 178         0, FB_VMODE_NONINTERLACED
 179     }, {
 180         /* 1280x1024 @ 85 Hz, 91.15 kHz hsync */
 181         NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
 182         FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
 183     }, {
 184         /* 1600x1200 @ 75 Hz, 93.75 kHz hsync */
 185         NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
 186         FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
 187     }, {
 188         /* 1600x1200 @ 85 Hz, 105.77 kHz hsync */
 189         NULL, 85, 1600, 1200, 4545, 272, 16, 37, 4, 192, 3,
 190         FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
 191     }, {
 192         /* 1280x1024 @ 100 Hz, 107.16 kHz hsync */
 193         NULL, 100, 1280, 1024, 5502, 256, 32, 26, 7, 128, 15,
 194         0, FB_VMODE_NONINTERLACED
 195     }, {
 196         /* 1800x1440 @ 64Hz, 96.15 kHz hsync  */
 197         NULL, 64, 1800, 1440, 4347, 304, 96, 46, 1, 192, 3,
 198         FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
 199     }, {
 200         /* 1800x1440 @ 70Hz, 104.52 kHz hsync  */
 201         NULL, 70, 1800, 1440, 4000, 304, 96, 46, 1, 192, 3,
 202         FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
 203     }, {
 204         /* 512x384 @ 78 Hz, 31.50 kHz hsync */
 205         NULL, 78, 512, 384, 49603, 48, 16, 16, 1, 64, 3,
 206         0, FB_VMODE_NONINTERLACED
 207     }, {
 208         /* 512x384 @ 85 Hz, 34.38 kHz hsync */
 209         NULL, 85, 512, 384, 45454, 48, 16, 16, 1, 64, 3,
 210         0, FB_VMODE_NONINTERLACED
 211     }, {
 212         /* 320x200 @ 70 Hz, 31.5 kHz hsync, 8:5 aspect ratio */
 213         NULL, 70, 320, 200, 79440, 16, 16, 20, 4, 48, 1,
 214         0, FB_VMODE_DOUBLE
 215     }, {
 216         /* 320x240 @ 60 Hz, 31.5 kHz hsync, 4:3 aspect ratio */
 217         NULL, 60, 320, 240, 79440, 16, 16, 16, 5, 48, 1,
 218         0, FB_VMODE_DOUBLE
 219     }, {
 220         /* 320x240 @ 72 Hz, 36.5 kHz hsync */
 221         NULL, 72, 320, 240, 63492, 16, 16, 16, 4, 48, 2,
 222         0, FB_VMODE_DOUBLE
 223     }, {
 224         /* 400x300 @ 56 Hz, 35.2 kHz hsync, 4:3 aspect ratio */
 225         NULL, 56, 400, 300, 55555, 64, 16, 10, 1, 32, 1,
 226         0, FB_VMODE_DOUBLE
 227     }, {
 228         /* 400x300 @ 60 Hz, 37.8 kHz hsync */
 229         NULL, 60, 400, 300, 50000, 48, 16, 11, 1, 64, 2,
 230         0, FB_VMODE_DOUBLE
 231     }, {
 232         /* 400x300 @ 72 Hz, 48.0 kHz hsync */
 233         NULL, 72, 400, 300, 40000, 32, 24, 11, 19, 64, 3,
 234         0, FB_VMODE_DOUBLE
 235     }, {
 236         /* 480x300 @ 56 Hz, 35.2 kHz hsync, 8:5 aspect ratio */
 237         NULL, 56, 480, 300, 46176, 80, 16, 10, 1, 40, 1,
 238         0, FB_VMODE_DOUBLE
 239     }, {
 240         /* 480x300 @ 60 Hz, 37.8 kHz hsync */
 241         NULL, 60, 480, 300, 41858, 56, 16, 11, 1, 80, 2,
 242         0, FB_VMODE_DOUBLE
 243     }, {
 244         /* 480x300 @ 63 Hz, 39.6 kHz hsync */
 245         NULL, 63, 480, 300, 40000, 56, 16, 11, 1, 80, 2,
 246         0, FB_VMODE_DOUBLE
 247     }, {
 248         /* 480x300 @ 72 Hz, 48.0 kHz hsync */
 249         NULL, 72, 480, 300, 33386, 40, 24, 11, 19, 80, 3,
 250         0, FB_VMODE_DOUBLE
 251     },
 252 };
 253
 254 const struct fb_videomode vesa_modes[] = {
 255         /* 0 640x350-85 VESA */
 256         { NULL, 85, 640, 350, 31746,  96, 32, 60, 32, 64, 3,
 257           FB_SYNC_HOR_HIGH_ACT, FB_VMODE_NONINTERLACED },
 258         /* 1 640x400-85 VESA */
 259         { NULL, 85, 640, 400, 31746,  96, 32, 41, 01, 64, 3,
 260           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 261         /* 2 720x400-85 VESA */
 262         { NULL, 85, 721, 400, 28169, 108, 36, 42, 01, 72, 3,
 263           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 264         /* 3 640x480-60 VESA */
 265         { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
 266           0, FB_VMODE_NONINTERLACED },
 267         /* 4 640x480-72 VESA */
 268         { NULL, 72, 640, 480, 31746, 128, 24, 29, 9, 40, 2,
 269           0, FB_VMODE_NONINTERLACED },
 270         /* 5 640x480-75 VESA */
 271         { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
 272           0, FB_VMODE_NONINTERLACED },
 273         /* 6 640x480-85 VESA */
 274         { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
 275           0, FB_VMODE_NONINTERLACED },
 276         /* 7 800x600-56 VESA */
 277         { NULL, 56, 800, 600, 27777, 128, 24, 22, 01, 72, 2,
 278           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 279         /* 8 800x600-60 VESA */
 280         { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
 281           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 282         /* 9 800x600-72 VESA */
 283         { NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
 284           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 285         /* 10 800x600-75 VESA */
 286         { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
 287           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 288         /* 11 800x600-85 VESA */
 289         { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
 290           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 291         /* 12 1024x768i-43 VESA */
 292         { NULL, 53, 1024, 768, 22271, 56, 8, 41, 0, 176, 8,
 293           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_INTERLACED },
 294         /* 13 1024x768-60 VESA */
 295         { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
 296           0, FB_VMODE_NONINTERLACED },
 297         /* 14 1024x768-70 VESA */
 298         { NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6,
 299           0, FB_VMODE_NONINTERLACED },
 300         /* 15 1024x768-75 VESA */
 301         { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
 302           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 303         /* 16 1024x768-85 VESA */
 304         { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
 305           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 306         /* 17 1152x864-75 VESA */
 307         { NULL, 75, 1153, 864, 9259, 256, 64, 32, 1, 128, 3,
 308           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 309         /* 18 1280x960-60 VESA */
 310         { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
 311           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 312         /* 19 1280x960-85 VESA */
 313         { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
 314           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 315         /* 20 1280x1024-60 VESA */
 316         { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
 317           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 318         /* 21 1280x1024-75 VESA */
 319         { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
 320           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 321         /* 22 1280x1024-85 VESA */
 322         { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
 323           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 324         /* 23 1600x1200-60 VESA */
 325         { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
 326           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 327         /* 24 1600x1200-65 VESA */
 328         { NULL, 65, 1600, 1200, 5698, 304,  64, 46, 1, 192, 3,
 329           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 330         /* 25 1600x1200-70 VESA */
 331         { NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3,
 332           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 333         /* 26 1600x1200-75 VESA */
 334         { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
 335           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 336         /* 27 1600x1200-85 VESA */
 337         { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
 338           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 339         /* 28 1792x1344-60 VESA */
 340         { NULL, 60, 1792, 1344, 4882, 328, 128, 46, 1, 200, 3,
 341           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 342         /* 29 1792x1344-75 VESA */
 343         { NULL, 75, 1792, 1344, 3831, 352, 96, 69, 1, 216, 3,
 344           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 345         /* 30 1856x1392-60 VESA */
 346         { NULL, 60, 1856, 1392, 4580, 352, 96, 43, 1, 224, 3,
 347           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 348         /* 31 1856x1392-75 VESA */
 349         { NULL, 75, 1856, 1392, 3472, 352, 128, 104, 1, 224, 3,
 350           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 351         /* 32 1920x1440-60 VESA */
 352         { NULL, 60, 1920, 1440, 4273, 344, 128, 56, 1, 200, 3,
 353           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 354         /* 33 1920x1440-75 VESA */
 355         { NULL, 60, 1920, 1440, 3367, 352, 144, 56, 1, 224, 3,
 356           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
 357 };
 358
 359 static int __init my_atoi(const char *name)
 360 {
 361     int val = 0;
 362
 363     for (;; name++) {
 364         switch (*name) {
 365             case '0'...'9':
 366                 val = 10*val+(*name-'0');
 367                 break;
 368             default:
 369                 return val;
 370         }
 371     }
 372 }
 373
 374 /**
 375  *      __fb_try_mode - test a video mode
 376  *      @var: frame buffer user defined part of display
 377  *      @info: frame buffer info structure
 378  *      @mode: frame buffer video mode structure
 379  *      @bpp: color depth in bits per pixel
 380  *
 381  *      Tries a video mode to test it's validity for device @info.
 382  *
 383  *      Returns 1 on success.
 384  *
 385  */
 386
 387 int __fb_try_mode(struct fb_var_screeninfo *var, struct fb_info *info,
 388                   const struct fb_videomode *mode, unsigned int bpp)
 389 {
 390     int err = 1;
 391
 392     DPRINTK("Trying mode %s %dx%d-%d@%d\n", mode->name ? mode->name : "noname",
 393             mode->xres, mode->yres, bpp, mode->refresh);
 394     var->xres = mode->xres;
 395     var->yres = mode->yres;
 396     var->xres_virtual = mode->xres;
 397     var->yres_virtual = mode->yres;
 398     var->xoffset = 0;
 399     var->yoffset = 0;
 400     var->bits_per_pixel = bpp;
 401     var->activate |= FB_ACTIVATE_TEST;
 402     var->pixclock = mode->pixclock;
 403     var->left_margin = mode->left_margin;
 404     var->right_margin = mode->right_margin;
 405     var->upper_margin = mode->upper_margin;
 406     var->lower_margin = mode->lower_margin;
 407     var->hsync_len = mode->hsync_len;
 408     var->vsync_len = mode->vsync_len;
 409     var->sync = mode->sync;
 410     var->vmode = mode->vmode;
 411     if (info->fbops->fb_check_var)
 412         err = info->fbops->fb_check_var(var, info);
 413     var->activate &= ~FB_ACTIVATE_TEST;
 414     return !err;
 415 }
 416
 417
 418 /**
 419  *      fb_find_mode - finds a valid video mode
 420  *      @var: frame buffer user defined part of display
 421  *      @info: frame buffer info structure
 422  *      @mode_option: string video mode to find
 423  *      @db: video mode database
 424  *      @dbsize: size of @db
 425  *      @default_mode: default video mode to fall back to
 426  *      @default_bpp: default color depth in bits per pixel
 427  *
 428  *      Finds a suitable video mode, starting with the specified mode
 429  *      in @mode_option with fallback to @default_mode.  If
 430  *      @default_mode fails, all modes in the video mode database will
 431  *      be tried.
 432  *
 433  *      Valid mode specifiers for @mode_option:
 434  *
 435  *      <xres>x<yres>[-<bpp>][@<refresh>] or
 436  *      <name>[-<bpp>][@<refresh>]
 437  *
 438  *      with <xres>, <yres>, <bpp> and <refresh> decimal numbers and
 439  *      <name> a string.
 440  *
 441  *      NOTE: The passed struct @var is _not_ cleared!  This allows you
 442  *      to supply values for e.g. the grayscale and accel_flags fields.
 443  *
 444  *      Returns zero for failure, 1 if using specified @mode_option,
 445  *      2 if using specified @mode_option with an ignored refresh rate,
 446  *      3 if default mode is used, 4 if fall back to any valid mode.
 447  *
 448  */
 449
 450 int __init fb_find_mode(struct fb_var_screeninfo *var,
 451                         struct fb_info *info, const char *mode_option,
 452                         const struct fb_videomode *db, unsigned int dbsize,
 453                         const struct fb_videomode *default_mode,
 454                         unsigned int default_bpp)
 455 {
 456     int i, j;
 457
 458     /* Set up defaults */
 459     if (!db) {
 460         db = modedb;
 461         dbsize = sizeof(modedb)/sizeof(*modedb);
 462     }
 463     if (!default_mode)
 464         default_mode = &modedb[DEFAULT_MODEDB_INDEX];
 465     if (!default_bpp)
 466         default_bpp = 8;
 467
 468     /* Did the user specify a video mode? */
 469     if (mode_option || (mode_option = global_mode_option)) {
 470         const char *name = mode_option;
 471         unsigned int namelen = strlen(name);
 472         int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
 473         unsigned int xres = 0, yres = 0, bpp = default_bpp, refresh = 0;
 474         int yres_specified = 0;
 475
 476         for (i = namelen-1; i >= 0; i--) {
 477             switch (name[i]) {
 478                 case '@':
 479                     namelen = i;
 480                     if (!refresh_specified && !bpp_specified &&
 481                         !yres_specified) {
 482                         refresh = my_atoi(&name[i+1]);
 483                         refresh_specified = 1;
 484                     } else
 485                         goto done;
 486                     break;
 487                 case '-':
 488                     namelen = i;
 489                     if (!bpp_specified && !yres_specified) {
 490                         bpp = my_atoi(&name[i+1]);
 491                         bpp_specified = 1;
 492                     } else
 493                         goto done;
 494                     break;
 495                 case 'x':
 496                     if (!yres_specified) {
 497                         yres = my_atoi(&name[i+1]);
 498                         yres_specified = 1;
 499                     } else
 500                         goto done;
 501                     break;
 502                 case '0'...'9':
 503                     break;
 504                 default:
 505                     goto done;
 506             }
 507         }
 508         if (i < 0 && yres_specified) {
 509             xres = my_atoi(name);
 510             res_specified = 1;
 511         }
 512 done:
 513         for (i = refresh_specified; i >= 0; i--) {
 514             DPRINTK("Trying specified video mode%s\n",
 515                     i ? "" : " (ignoring refresh rate)");
 516             for (j = 0; j < dbsize; j++)
 517                 if ((name_matches(db[j], name, namelen) ||
 518                      (res_specified && res_matches(db[j], xres, yres))) &&
 519                     (!i || db[j].refresh == refresh) &&
 520                     __fb_try_mode(var, info, &db[j], bpp))
 521                     return 2-i;
 522         }
 523     }
 524
 525     DPRINTK("Trying default video mode\n");
 526     if (__fb_try_mode(var, info, default_mode, default_bpp))
 527         return 3;
 528
 529     DPRINTK("Trying all modes\n");
 530     for (i = 0; i < dbsize; i++)
 531         if (__fb_try_mode(var, info, &db[i], default_bpp))
 532             return 4;
 533
 534     DPRINTK("No valid mode found\n");
 535     return 0;
 536 }
 537
 538 EXPORT_SYMBOL(__fb_try_mode);
 539 EXPORT_SYMBOL(vesa_modes);