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/slab.h>
  16 #include <linux/fb.h>
  17 #include <linux/kernel.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("modedb %s: " fmt, __func__ , ## args)
  28 #else
  29 #define DPRINTK(fmt, args...)
  30 #endif
  31
  32 const char *fb_mode_option;
  33 EXPORT_SYMBOL_GPL(fb_mode_option);
  34
  35 /*
  36  *  Standard video mode definitions (taken from XFree86)
  37  */
  38
  39 static const struct fb_videomode modedb[] = {
  40
  41         /* 640x400 @ 70 Hz, 31.5 kHz hsync */
  42         { NULL, 70, 640, 400, 39721, 40, 24, 39, 9, 96, 2, 0,
  43                 FB_VMODE_NONINTERLACED },
  44
  45         /* 640x480 @ 60 Hz, 31.5 kHz hsync */
  46         { NULL, 60, 640, 480, 39721, 40, 24, 32, 11, 96, 2,     0,
  47                 FB_VMODE_NONINTERLACED },
  48
  49         /* 800x600 @ 56 Hz, 35.15 kHz hsync */
  50         { NULL, 56, 800, 600, 27777, 128, 24, 22, 1, 72, 2,     0,
  51                 FB_VMODE_NONINTERLACED },
  52
  53         /* 1024x768 @ 87 Hz interlaced, 35.5 kHz hsync */
  54         { NULL, 87, 1024, 768, 22271, 56, 24, 33, 8, 160, 8, 0,
  55                 FB_VMODE_INTERLACED },
  56
  57         /* 640x400 @ 85 Hz, 37.86 kHz hsync */
  58         { NULL, 85, 640, 400, 31746, 96, 32, 41, 1, 64, 3,
  59                 FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED },
  60
  61         /* 640x480 @ 72 Hz, 36.5 kHz hsync */
  62         { NULL, 72, 640, 480, 31746, 144, 40, 30, 8, 40, 3, 0,
  63                 FB_VMODE_NONINTERLACED },
  64
  65         /* 640x480 @ 75 Hz, 37.50 kHz hsync */
  66         { NULL, 75, 640, 480, 31746, 120, 16, 16, 1, 64, 3,     0,
  67                 FB_VMODE_NONINTERLACED },
  68
  69         /* 800x600 @ 60 Hz, 37.8 kHz hsync */
  70         { NULL, 60, 800, 600, 25000, 88, 40, 23, 1, 128, 4,
  71                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  72                 FB_VMODE_NONINTERLACED },
  73
  74         /* 640x480 @ 85 Hz, 43.27 kHz hsync */
  75         { NULL, 85, 640, 480, 27777, 80, 56, 25, 1, 56, 3, 0,
  76                 FB_VMODE_NONINTERLACED },
  77
  78         /* 1152x864 @ 89 Hz interlaced, 44 kHz hsync */
  79         { NULL, 89, 1152, 864, 15384, 96, 16, 110, 1, 216, 10, 0,
  80                 FB_VMODE_INTERLACED },
  81         /* 800x600 @ 72 Hz, 48.0 kHz hsync */
  82         { NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
  83                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  84                 FB_VMODE_NONINTERLACED },
  85
  86         /* 1024x768 @ 60 Hz, 48.4 kHz hsync */
  87         { NULL, 60, 1024, 768, 15384, 168, 8, 29, 3, 144, 6, 0,
  88                 FB_VMODE_NONINTERLACED },
  89
  90         /* 640x480 @ 100 Hz, 53.01 kHz hsync */
  91         { NULL, 100, 640, 480, 21834, 96, 32, 36, 8, 96, 6,     0,
  92                 FB_VMODE_NONINTERLACED },
  93
  94         /* 1152x864 @ 60 Hz, 53.5 kHz hsync */
  95         { NULL, 60, 1152, 864, 11123, 208, 64, 16, 4, 256, 8, 0,
  96                 FB_VMODE_NONINTERLACED },
  97
  98         /* 800x600 @ 85 Hz, 55.84 kHz hsync */
  99         { NULL, 85, 800, 600, 16460, 160, 64, 36, 16, 64, 5, 0,
 100                 FB_VMODE_NONINTERLACED },
 101
 102         /* 1024x768 @ 70 Hz, 56.5 kHz hsync */
 103         { NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6, 0,
 104                 FB_VMODE_NONINTERLACED },
 105
 106         /* 1280x1024 @ 87 Hz interlaced, 51 kHz hsync */
 107         { NULL, 87, 1280, 1024, 12500, 56, 16, 128, 1, 216, 12, 0,
 108                 FB_VMODE_INTERLACED },
 109
 110         /* 800x600 @ 100 Hz, 64.02 kHz hsync */
 111         { NULL, 100, 800, 600, 14357, 160, 64, 30, 4, 64, 6, 0,
 112                 FB_VMODE_NONINTERLACED },
 113
 114         /* 1024x768 @ 76 Hz, 62.5 kHz hsync */
 115         { NULL, 76, 1024, 768, 11764, 208, 8, 36, 16, 120, 3, 0,
 116                 FB_VMODE_NONINTERLACED },
 117
 118         /* 1152x864 @ 70 Hz, 62.4 kHz hsync */
 119         { NULL, 70, 1152, 864, 10869, 106, 56, 20, 1, 160, 10, 0,
 120                 FB_VMODE_NONINTERLACED },
 121
 122         /* 1280x1024 @ 61 Hz, 64.2 kHz hsync */
 123         { NULL, 61, 1280, 1024, 9090, 200, 48, 26, 1, 184, 3, 0,
 124                 FB_VMODE_NONINTERLACED },
 125
 126         /* 1400x1050 @ 60Hz, 63.9 kHz hsync */
 127         { NULL, 60, 1400, 1050, 9259, 136, 40, 13, 1, 112, 3, 0,
 128                 FB_VMODE_NONINTERLACED },
 129
 130         /* 1400x1050 @ 75,107 Hz, 82,392 kHz +hsync +vsync*/
 131         { NULL, 75, 1400, 1050, 7190, 120, 56, 23, 10, 112, 13,
 132                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 133                 FB_VMODE_NONINTERLACED },
 134
 135         /* 1400x1050 @ 60 Hz, ? kHz +hsync +vsync*/
 136         { NULL, 60, 1400, 1050, 9259, 128, 40, 12, 0, 112, 3,
 137                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 138                 FB_VMODE_NONINTERLACED },
 139
 140         /* 1024x768 @ 85 Hz, 70.24 kHz hsync */
 141         { NULL, 85, 1024, 768, 10111, 192, 32, 34, 14, 160, 6, 0,
 142                 FB_VMODE_NONINTERLACED },
 143
 144         /* 1152x864 @ 78 Hz, 70.8 kHz hsync */
 145         { NULL, 78, 1152, 864, 9090, 228, 88, 32, 0, 84, 12, 0,
 146                 FB_VMODE_NONINTERLACED },
 147
 148         /* 1280x1024 @ 70 Hz, 74.59 kHz hsync */
 149         { NULL, 70, 1280, 1024, 7905, 224, 32, 28, 8, 160, 8, 0,
 150                 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,
 155                 FB_VMODE_NONINTERLACED },
 156
 157         /* 1152x864 @ 84 Hz, 76.0 kHz hsync */
 158         { NULL, 84, 1152, 864, 7407, 184, 312, 32, 0, 128, 12, 0,
 159                 FB_VMODE_NONINTERLACED },
 160
 161         /* 1280x1024 @ 74 Hz, 78.85 kHz hsync */
 162         { NULL, 74, 1280, 1024, 7407, 256, 32, 34, 3, 144, 3, 0,
 163                 FB_VMODE_NONINTERLACED },
 164
 165         /* 1024x768 @ 100Hz, 80.21 kHz hsync */
 166         { NULL, 100, 1024, 768, 8658, 192, 32, 21, 3, 192, 10, 0,
 167                 FB_VMODE_NONINTERLACED },
 168
 169         /* 1280x1024 @ 76 Hz, 81.13 kHz hsync */
 170         { NULL, 76, 1280, 1024, 7407, 248, 32, 34, 3, 104, 3, 0,
 171                 FB_VMODE_NONINTERLACED },
 172
 173         /* 1600x1200 @ 70 Hz, 87.50 kHz hsync */
 174         { NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3, 0,
 175                 FB_VMODE_NONINTERLACED },
 176
 177         /* 1152x864 @ 100 Hz, 89.62 kHz hsync */
 178         { NULL, 100, 1152, 864, 7264, 224, 32, 17, 2, 128, 19, 0,
 179                 FB_VMODE_NONINTERLACED },
 180
 181         /* 1280x1024 @ 85 Hz, 91.15 kHz hsync */
 182         { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
 183                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 184                 FB_VMODE_NONINTERLACED },
 185
 186         /* 1600x1200 @ 75 Hz, 93.75 kHz hsync */
 187         { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
 188                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 189                 FB_VMODE_NONINTERLACED },
 190
 191         /* 1680x1050 @ 60 Hz, 65.191 kHz hsync */
 192         { NULL, 60, 1680, 1050, 6848, 280, 104, 30, 3, 176, 6,
 193                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 194                 FB_VMODE_NONINTERLACED },
 195
 196         /* 1600x1200 @ 85 Hz, 105.77 kHz hsync */
 197         { NULL, 85, 1600, 1200, 4545, 272, 16, 37, 4, 192, 3,
 198                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 199                 FB_VMODE_NONINTERLACED },
 200
 201         /* 1280x1024 @ 100 Hz, 107.16 kHz hsync */
 202         { NULL, 100, 1280, 1024, 5502, 256, 32, 26, 7, 128, 15, 0,
 203                 FB_VMODE_NONINTERLACED },
 204
 205         /* 1800x1440 @ 64Hz, 96.15 kHz hsync  */
 206         { NULL, 64, 1800, 1440, 4347, 304, 96, 46, 1, 192, 3,
 207                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 208                 FB_VMODE_NONINTERLACED },
 209
 210         /* 1800x1440 @ 70Hz, 104.52 kHz hsync  */
 211         { NULL, 70, 1800, 1440, 4000, 304, 96, 46, 1, 192, 3,
 212                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 213                 FB_VMODE_NONINTERLACED },
 214
 215         /* 512x384 @ 78 Hz, 31.50 kHz hsync */
 216         { NULL, 78, 512, 384, 49603, 48, 16, 16, 1, 64, 3, 0,
 217                 FB_VMODE_NONINTERLACED },
 218
 219         /* 512x384 @ 85 Hz, 34.38 kHz hsync */
 220         { NULL, 85, 512, 384, 45454, 48, 16, 16, 1, 64, 3, 0,
 221                 FB_VMODE_NONINTERLACED },
 222
 223         /* 320x200 @ 70 Hz, 31.5 kHz hsync, 8:5 aspect ratio */
 224         { NULL, 70, 320, 200, 79440, 16, 16, 20, 4, 48, 1, 0,
 225                 FB_VMODE_DOUBLE },
 226
 227         /* 320x240 @ 60 Hz, 31.5 kHz hsync, 4:3 aspect ratio */
 228         { NULL, 60, 320, 240, 79440, 16, 16, 16, 5, 48, 1, 0,
 229                 FB_VMODE_DOUBLE },
 230
 231         /* 320x240 @ 72 Hz, 36.5 kHz hsync */
 232         { NULL, 72, 320, 240, 63492, 16, 16, 16, 4, 48, 2, 0,
 233                 FB_VMODE_DOUBLE },
 234
 235         /* 400x300 @ 56 Hz, 35.2 kHz hsync, 4:3 aspect ratio */
 236         { NULL, 56, 400, 300, 55555, 64, 16, 10, 1, 32, 1, 0,
 237                 FB_VMODE_DOUBLE },
 238
 239         /* 400x300 @ 60 Hz, 37.8 kHz hsync */
 240         { NULL, 60, 400, 300, 50000, 48, 16, 11, 1, 64, 2, 0,
 241                 FB_VMODE_DOUBLE },
 242
 243         /* 400x300 @ 72 Hz, 48.0 kHz hsync */
 244         { NULL, 72, 400, 300, 40000, 32, 24, 11, 19, 64, 3,     0,
 245                 FB_VMODE_DOUBLE },
 246
 247         /* 480x300 @ 56 Hz, 35.2 kHz hsync, 8:5 aspect ratio */
 248         { NULL, 56, 480, 300, 46176, 80, 16, 10, 1, 40, 1, 0,
 249                 FB_VMODE_DOUBLE },
 250
 251         /* 480x300 @ 60 Hz, 37.8 kHz hsync */
 252         { NULL, 60, 480, 300, 41858, 56, 16, 11, 1, 80, 2, 0,
 253                 FB_VMODE_DOUBLE },
 254
 255         /* 480x300 @ 63 Hz, 39.6 kHz hsync */
 256         { NULL, 63, 480, 300, 40000, 56, 16, 11, 1, 80, 2, 0,
 257                 FB_VMODE_DOUBLE },
 258
 259         /* 480x300 @ 72 Hz, 48.0 kHz hsync */
 260         { NULL, 72, 480, 300, 33386, 40, 24, 11, 19, 80, 3, 0,
 261                 FB_VMODE_DOUBLE },
 262
 263         /* 1920x1200 @ 60 Hz, 74.5 Khz hsync */
 264         { NULL, 60, 1920, 1200, 5177, 128, 336, 1, 38, 208, 3,
 265                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 266                 FB_VMODE_NONINTERLACED },
 267
 268         /* 1152x768, 60 Hz, PowerBook G4 Titanium I and II */
 269         { NULL, 60, 1152, 768, 14047, 158, 26, 29, 3, 136, 6,
 270                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 271                 FB_VMODE_NONINTERLACED },
 272
 273         /* 1366x768, 60 Hz, 47.403 kHz hsync, WXGA 16:9 aspect ratio */
 274         { NULL, 60, 1366, 768, 13806, 120, 10, 14, 3, 32, 5, 0,
 275                 FB_VMODE_NONINTERLACED },
 276
 277         /* 1280x800, 60 Hz, 47.403 kHz hsync, WXGA 16:10 aspect ratio */
 278         { NULL, 60, 1280, 800, 12048, 200, 64, 24, 1, 136, 3, 0,
 279                 FB_VMODE_NONINTERLACED },
 280
 281         /* 720x576i @ 50 Hz, 15.625 kHz hsync (PAL RGB) */
 282         { NULL, 50, 720, 576, 74074, 64, 16, 39, 5, 64, 5, 0,
 283                 FB_VMODE_INTERLACED },
 284
 285         /* 800x520i @ 50 Hz, 15.625 kHz hsync (PAL RGB) */
 286         { NULL, 50, 800, 520, 58823, 144, 64, 72, 28, 80, 5, 0,
 287                 FB_VMODE_INTERLACED },
 288
 289         /* 864x480 @ 60 Hz, 35.15 kHz hsync */
 290         { NULL, 60, 864, 480, 27777, 1, 1, 1, 1, 0, 0,
 291                 0, FB_VMODE_NONINTERLACED },
 292 };
 293
 294 #ifdef CONFIG_FB_MODE_HELPERS
 295 const struct fb_videomode cea_modes[64] = {
 296         /* #1: 640x480p@59.94/60Hz */
 297         [1] = {
 298                 NULL, 60, 640, 480, 39722, 48, 16, 33, 10, 96, 2, 0,
 299                 FB_VMODE_NONINTERLACED, 0,
 300         },
 301         /* #3: 720x480p@59.94/60Hz */
 302         [3] = {
 303                 NULL, 60, 720, 480, 37037, 60, 16, 30, 9, 62, 6, 0,
 304                 FB_VMODE_NONINTERLACED, 0,
 305         },
 306         /* #5: 1920x1080i@59.94/60Hz */
 307         [5] = {
 308                 NULL, 60, 1920, 1080, 13763, 148, 88, 15, 2, 44, 5,
 309                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 310                 FB_VMODE_INTERLACED, 0,
 311         },
 312         /* #7: 720(1440)x480iH@59.94/60Hz */
 313         [7] = {
 314                 NULL, 60, 1440, 480, 18554/*37108*/, 114, 38, 15, 4, 124, 3, 0,
 315                 FB_VMODE_INTERLACED, 0,
 316         },
 317         /* #9: 720(1440)x240pH@59.94/60Hz */
 318         [9] = {
 319                 NULL, 60, 1440, 240, 18554, 114, 38, 16, 4, 124, 3, 0,
 320                 FB_VMODE_NONINTERLACED, 0,
 321         },
 322         /* #18: 720x576pH@50Hz */
 323         [18] = {
 324                 NULL, 50, 720, 576, 37037, 68, 12, 39, 5, 64, 5, 0,
 325                 FB_VMODE_NONINTERLACED, 0,
 326         },
 327         /* #19: 1280x720p@50Hz */
 328         [19] = {
 329                 NULL, 50, 1280, 720, 13468, 220, 440, 20, 5, 40, 5,
 330                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 331                 FB_VMODE_NONINTERLACED, 0,
 332         },
 333         /* #20: 1920x1080i@50Hz */
 334         [20] = {
 335                 NULL, 50, 1920, 1080, 13480, 148, 528, 15, 5, 528, 5,
 336                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 337                 FB_VMODE_INTERLACED, 0,
 338         },
 339         /* #32: 1920x1080p@23.98/24Hz */
 340         [32] = {
 341                 NULL, 24, 1920, 1080, 13468, 148, 638, 36, 4, 44, 5,
 342                 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 343                 FB_VMODE_NONINTERLACED, 0,
 344         },
 345         /* #35: (2880)x480p4x@59.94/60Hz */
 346         [35] = {
 347                 NULL, 60, 2880, 480, 9250, 240, 64, 30, 9, 248, 6, 0,
 348                 FB_VMODE_NONINTERLACED, 0,
 349         },
 350 };
 351
 352 const struct fb_videomode vesa_modes[] = {
 353         /* 0 640x350-85 VESA */
 354         { NULL, 85, 640, 350, 31746,  96, 32, 60, 32, 64, 3,
 355           FB_SYNC_HOR_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA},
 356         /* 1 640x400-85 VESA */
 357         { NULL, 85, 640, 400, 31746,  96, 32, 41, 01, 64, 3,
 358           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 359         /* 2 720x400-85 VESA */
 360         { NULL, 85, 721, 400, 28169, 108, 36, 42, 01, 72, 3,
 361           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 362         /* 3 640x480-60 VESA */
 363         { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
 364           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 365         /* 4 640x480-72 VESA */
 366         { NULL, 72, 640, 480, 31746, 128, 24, 29, 9, 40, 2,
 367           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 368         /* 5 640x480-75 VESA */
 369         { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
 370           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 371         /* 6 640x480-85 VESA */
 372         { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
 373           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 374         /* 7 800x600-56 VESA */
 375         { NULL, 56, 800, 600, 27777, 128, 24, 22, 01, 72, 2,
 376           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 377           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 378         /* 8 800x600-60 VESA */
 379         { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
 380           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 381           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 382         /* 9 800x600-72 VESA */
 383         { NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
 384           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 385           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 386         /* 10 800x600-75 VESA */
 387         { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
 388           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 389           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 390         /* 11 800x600-85 VESA */
 391         { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
 392           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 393           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 394         /* 12 1024x768i-43 VESA */
 395         { NULL, 43, 1024, 768, 22271, 56, 8, 41, 0, 176, 8,
 396           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 397           FB_VMODE_INTERLACED, FB_MODE_IS_VESA },
 398         /* 13 1024x768-60 VESA */
 399         { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
 400           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 401         /* 14 1024x768-70 VESA */
 402         { NULL, 70, 1024, 768, 13333, 144, 24, 29, 3, 136, 6,
 403           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 404         /* 15 1024x768-75 VESA */
 405         { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
 406           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 407           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 408         /* 16 1024x768-85 VESA */
 409         { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
 410           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 411           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 412         /* 17 1152x864-75 VESA */
 413         { NULL, 75, 1152, 864, 9259, 256, 64, 32, 1, 128, 3,
 414           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 415           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 416         /* 18 1280x960-60 VESA */
 417         { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
 418           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 419           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 420         /* 19 1280x960-85 VESA */
 421         { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
 422           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 423           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 424         /* 20 1280x1024-60 VESA */
 425         { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
 426           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 427           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 428         /* 21 1280x1024-75 VESA */
 429         { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
 430           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 431           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 432         /* 22 1280x1024-85 VESA */
 433         { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
 434           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 435           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 436         /* 23 1600x1200-60 VESA */
 437         { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
 438           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 439           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 440         /* 24 1600x1200-65 VESA */
 441         { NULL, 65, 1600, 1200, 5698, 304,  64, 46, 1, 192, 3,
 442           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 443           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 444         /* 25 1600x1200-70 VESA */
 445         { NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3,
 446           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 447           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 448         /* 26 1600x1200-75 VESA */
 449         { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
 450           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 451           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 452         /* 27 1600x1200-85 VESA */
 453         { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
 454           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 455           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 456         /* 28 1792x1344-60 VESA */
 457         { NULL, 60, 1792, 1344, 4882, 328, 128, 46, 1, 200, 3,
 458           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 459         /* 29 1792x1344-75 VESA */
 460         { NULL, 75, 1792, 1344, 3831, 352, 96, 69, 1, 216, 3,
 461           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 462         /* 30 1856x1392-60 VESA */
 463         { NULL, 60, 1856, 1392, 4580, 352, 96, 43, 1, 224, 3,
 464           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 465         /* 31 1856x1392-75 VESA */
 466         { NULL, 75, 1856, 1392, 3472, 352, 128, 104, 1, 224, 3,
 467           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 468         /* 32 1920x1440-60 VESA */
 469         { NULL, 60, 1920, 1440, 4273, 344, 128, 56, 1, 200, 3,
 470           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 471         /* 33 1920x1440-75 VESA */
 472         { NULL, 75, 1920, 1440, 3367, 352, 144, 56, 1, 224, 3,
 473           FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 474 };
 475 EXPORT_SYMBOL(vesa_modes);
 476 #endif /* CONFIG_FB_MODE_HELPERS */
 477
 478 /**
 479  *      fb_try_mode - test a video mode
 480  *      @var: frame buffer user defined part of display
 481  *      @info: frame buffer info structure
 482  *      @mode: frame buffer video mode structure
 483  *      @bpp: color depth in bits per pixel
 484  *
 485  *      Tries a video mode to test it's validity for device @info.
 486  *
 487  *      Returns 1 on success.
 488  *
 489  */
 490
 491 static int fb_try_mode(struct fb_var_screeninfo *var, struct fb_info *info,
 492                        const struct fb_videomode *mode, unsigned int bpp)
 493 {
 494         int err = 0;
 495
 496         DPRINTK("Trying mode %s %dx%d-%d@%d\n",
 497                 mode->name ? mode->name : "noname",
 498                 mode->xres, mode->yres, bpp, mode->refresh);
 499         var->xres = mode->xres;
 500         var->yres = mode->yres;
 501         var->xres_virtual = mode->xres;
 502         var->yres_virtual = mode->yres;
 503         var->xoffset = 0;
 504         var->yoffset = 0;
 505         var->bits_per_pixel = bpp;
 506         var->activate |= FB_ACTIVATE_TEST;
 507         var->pixclock = mode->pixclock;
 508         var->left_margin = mode->left_margin;
 509         var->right_margin = mode->right_margin;
 510         var->upper_margin = mode->upper_margin;
 511         var->lower_margin = mode->lower_margin;
 512         var->hsync_len = mode->hsync_len;
 513         var->vsync_len = mode->vsync_len;
 514         var->sync = mode->sync;
 515         var->vmode = mode->vmode;
 516         if (info->fbops->fb_check_var)
 517                 err = info->fbops->fb_check_var(var, info);
 518         var->activate &= ~FB_ACTIVATE_TEST;
 519         return err;
 520 }
 521
 522 /**
 523  *     fb_find_mode - finds a valid video mode
 524  *     @var: frame buffer user defined part of display
 525  *     @info: frame buffer info structure
 526  *     @mode_option: string video mode to find
 527  *     @db: video mode database
 528  *     @dbsize: size of @db
 529  *     @default_mode: default video mode to fall back to
 530  *     @default_bpp: default color depth in bits per pixel
 531  *
 532  *     Finds a suitable video mode, starting with the specified mode
 533  *     in @mode_option with fallback to @default_mode.  If
 534  *     @default_mode fails, all modes in the video mode database will
 535  *     be tried.
 536  *
 537  *     Valid mode specifiers for @mode_option:
 538  *
 539  *     <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m] or
 540  *     <name>[-<bpp>][@<refresh>]
 541  *
 542  *     with <xres>, <yres>, <bpp> and <refresh> decimal numbers and
 543  *     <name> a string.
 544  *
 545  *      If 'M' is present after yres (and before refresh/bpp if present),
 546  *      the function will compute the timings using VESA(tm) Coordinated
 547  *      Video Timings (CVT).  If 'R' is present after 'M', will compute with
 548  *      reduced blanking (for flatpanels).  If 'i' is present, compute
 549  *      interlaced mode.  If 'm' is present, add margins equal to 1.8%
 550  *      of xres rounded down to 8 pixels, and 1.8% of yres. The char
 551  *      'i' and 'm' must be after 'M' and 'R'. Example:
 552  *
 553  *      1024x768MR-8@60m - Reduced blank with margins at 60Hz.
 554  *
 555  *     NOTE: The passed struct @var is _not_ cleared!  This allows you
 556  *     to supply values for e.g. the grayscale and accel_flags fields.
 557  *
 558  *     Returns zero for failure, 1 if using specified @mode_option,
 559  *     2 if using specified @mode_option with an ignored refresh rate,
 560  *     3 if default mode is used, 4 if fall back to any valid mode.
 561  *
 562  */
 563
 564 int fb_find_mode(struct fb_var_screeninfo *var,
 565                  struct fb_info *info, const char *mode_option,
 566                  const struct fb_videomode *db, unsigned int dbsize,
 567                  const struct fb_videomode *default_mode,
 568                  unsigned int default_bpp)
 569 {
 570         int i;
 571
 572         /* Set up defaults */
 573         if (!db) {
 574                 db = modedb;
 575                 dbsize = ARRAY_SIZE(modedb);
 576         }
 577
 578         if (!default_mode)
 579                 default_mode = &db[0];
 580
 581         if (!default_bpp)
 582                 default_bpp = 8;
 583
 584         /* Did the user specify a video mode? */
 585         if (!mode_option)
 586                 mode_option = fb_mode_option;
 587         if (mode_option) {
 588                 const char *name = mode_option;
 589                 unsigned int namelen = strlen(name);
 590                 int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
 591                 unsigned int xres = 0, yres = 0, bpp = default_bpp, refresh = 0;
 592                 int yres_specified = 0, cvt = 0, rb = 0, interlace = 0;
 593                 int margins = 0;
 594                 u32 best, diff, tdiff;
 595
 596                 for (i = namelen-1; i >= 0; i--) {
 597                         switch (name[i]) {
 598                         case '@':
 599                                 namelen = i;
 600                                 if (!refresh_specified && !bpp_specified &&
 601                                     !yres_specified) {
 602                                         refresh = simple_strtol(&name[i+1], NULL,
 603                                                                 10);
 604                                         refresh_specified = 1;
 605                                         if (cvt || rb)
 606                                                 cvt = 0;
 607                                 } else
 608                                         goto done;
 609                                 break;
 610                         case '-':
 611                                 namelen = i;
 612                                 if (!bpp_specified && !yres_specified) {
 613                                         bpp = simple_strtol(&name[i+1], NULL,
 614                                                             10);
 615                                         bpp_specified = 1;
 616                                         if (cvt || rb)
 617                                                 cvt = 0;
 618                                 } else
 619                                         goto done;
 620                                 break;
 621                         case 'x':
 622                                 if (!yres_specified) {
 623                                         yres = simple_strtol(&name[i+1], NULL,
 624                                                              10);
 625                                         yres_specified = 1;
 626                                 } else
 627                                         goto done;
 628                                 break;
 629                         case '0' ... '9':
 630                                 break;
 631                         case 'M':
 632                                 if (!yres_specified)
 633                                         cvt = 1;
 634                                 break;
 635                         case 'R':
 636                                 if (!cvt)
 637                                         rb = 1;
 638                                 break;
 639                         case 'm':
 640                                 if (!cvt)
 641                                         margins = 1;
 642                                 break;
 643                         case 'i':
 644                                 if (!cvt)
 645                                         interlace = 1;
 646                                 break;
 647                         default:
 648                                 goto done;
 649                         }
 650                 }
 651                 if (i < 0 && yres_specified) {
 652                         xres = simple_strtol(name, NULL, 10);
 653                         res_specified = 1;
 654                 }
 655 done:
 656                 if (cvt) {
 657                         struct fb_videomode cvt_mode;
 658                         int ret;
 659
 660                         DPRINTK("CVT mode %dx%d@%dHz%s%s%s\n", xres, yres,
 661                                 (refresh) ? refresh : 60,
 662                                 (rb) ? " reduced blanking" : "",
 663                                 (margins) ? " with margins" : "",
 664                                 (interlace) ? " interlaced" : "");
 665
 666                         memset(&cvt_mode, 0, sizeof(cvt_mode));
 667                         cvt_mode.xres = xres;
 668                         cvt_mode.yres = yres;
 669                         cvt_mode.refresh = (refresh) ? refresh : 60;
 670
 671                         if (interlace)
 672                                 cvt_mode.vmode |= FB_VMODE_INTERLACED;
 673                         else
 674                                 cvt_mode.vmode &= ~FB_VMODE_INTERLACED;
 675
 676                         ret = fb_find_mode_cvt(&cvt_mode, margins, rb);
 677
 678                         if (!ret && !fb_try_mode(var, info, &cvt_mode, bpp)) {
 679                                 DPRINTK("modedb CVT: CVT mode ok\n");
 680                                 return 1;
 681                         }
 682
 683                         DPRINTK("CVT mode invalid, getting mode from database\n");
 684                 }
 685
 686                 DPRINTK("Trying specified video mode%s %ix%i\n",
 687                         refresh_specified ? "" : " (ignoring refresh rate)",
 688                         xres, yres);
 689
 690                 if (!refresh_specified) {
 691                         /*
 692                          * If the caller has provided a custom mode database and
 693                          * a valid monspecs structure, we look for the mode with
 694                          * the highest refresh rate.  Otherwise we play it safe
 695                          * it and try to find a mode with a refresh rate closest
 696                          * to the standard 60 Hz.
 697                          */
 698                         if (db != modedb &&
 699                             info->monspecs.vfmin && info->monspecs.vfmax &&
 700                             info->monspecs.hfmin && info->monspecs.hfmax &&
 701                             info->monspecs.dclkmax) {
 702                                 refresh = 1000;
 703                         } else {
 704                                 refresh = 60;
 705                         }
 706                 }
 707
 708                 diff = -1;
 709                 best = -1;
 710                 for (i = 0; i < dbsize; i++) {
 711                         if ((name_matches(db[i], name, namelen) ||
 712                              (res_specified && res_matches(db[i], xres, yres))) &&
 713                             !fb_try_mode(var, info, &db[i], bpp)) {
 714                                 if (refresh_specified && db[i].refresh == refresh)
 715                                         return 1;
 716
 717                                 if (abs(db[i].refresh - refresh) < diff) {
 718                                         diff = abs(db[i].refresh - refresh);
 719                                         best = i;
 720                                 }
 721                         }
 722                 }
 723                 if (best != -1) {
 724                         fb_try_mode(var, info, &db[best], bpp);
 725                         return (refresh_specified) ? 2 : 1;
 726                 }
 727
 728                 diff = 2 * (xres + yres);
 729                 best = -1;
 730                 DPRINTK("Trying best-fit modes\n");
 731                 for (i = 0; i < dbsize; i++) {
 732                         DPRINTK("Trying %ix%i\n", db[i].xres, db[i].yres);
 733                         if (!fb_try_mode(var, info, &db[i], bpp)) {
 734                                 tdiff = abs(db[i].xres - xres) +
 735                                         abs(db[i].yres - yres);
 736
 737                                 /*
 738                                  * Penalize modes with resolutions smaller
 739                                  * than requested.
 740                                  */
 741                                 if (xres > db[i].xres || yres > db[i].yres)
 742                                         tdiff += xres + yres;
 743
 744                                 if (diff > tdiff) {
 745                                         diff = tdiff;
 746                                         best = i;
 747                                 }
 748                         }
 749                 }
 750                 if (best != -1) {
 751                         fb_try_mode(var, info, &db[best], bpp);
 752                         return 5;
 753                 }
 754         }
 755
 756         DPRINTK("Trying default video mode\n");
 757         if (!fb_try_mode(var, info, default_mode, default_bpp))
 758                 return 3;
 759
 760         DPRINTK("Trying all modes\n");
 761         for (i = 0; i < dbsize; i++)
 762                 if (!fb_try_mode(var, info, &db[i], default_bpp))
 763                         return 4;
 764
 765         DPRINTK("No valid mode found\n");
 766         return 0;
 767 }
 768
 769 /**
 770  * fb_var_to_videomode - convert fb_var_screeninfo to fb_videomode
 771  * @mode: pointer to struct fb_videomode
 772  * @var: pointer to struct fb_var_screeninfo
 773  */
 774 void fb_var_to_videomode(struct fb_videomode *mode,
 775                          const struct fb_var_screeninfo *var)
 776 {
 777         u32 pixclock, hfreq, htotal, vtotal;
 778
 779         mode->name = NULL;
 780         mode->xres = var->xres;
 781         mode->yres = var->yres;
 782         mode->pixclock = var->pixclock;
 783         mode->hsync_len = var->hsync_len;
 784         mode->vsync_len = var->vsync_len;
 785         mode->left_margin = var->left_margin;
 786         mode->right_margin = var->right_margin;
 787         mode->upper_margin = var->upper_margin;
 788         mode->lower_margin = var->lower_margin;
 789         mode->sync = var->sync;
 790         mode->vmode = var->vmode & FB_VMODE_MASK;
 791         mode->flag = FB_MODE_IS_FROM_VAR;
 792         mode->refresh = 0;
 793
 794         if (!var->pixclock)
 795                 return;
 796
 797         pixclock = PICOS2KHZ(var->pixclock) * 1000;
 798
 799         htotal = var->xres + var->right_margin + var->hsync_len +
 800                 var->left_margin;
 801         vtotal = var->yres + var->lower_margin + var->vsync_len +
 802                 var->upper_margin;
 803
 804         if (var->vmode & FB_VMODE_INTERLACED)
 805                 vtotal /= 2;
 806         if (var->vmode & FB_VMODE_DOUBLE)
 807                 vtotal *= 2;
 808
 809         hfreq = pixclock/htotal;
 810         mode->refresh = hfreq/vtotal;
 811 }
 812
 813 /**
 814  * fb_videomode_to_var - convert fb_videomode to fb_var_screeninfo
 815  * @var: pointer to struct fb_var_screeninfo
 816  * @mode: pointer to struct fb_videomode
 817  */
 818 void fb_videomode_to_var(struct fb_var_screeninfo *var,
 819                          const struct fb_videomode *mode)
 820 {
 821         var->xres = mode->xres;
 822         var->yres = mode->yres;
 823         var->xres_virtual = mode->xres;
 824         var->yres_virtual = mode->yres;
 825         var->xoffset = 0;
 826         var->yoffset = 0;
 827         var->pixclock = mode->pixclock;
 828         var->left_margin = mode->left_margin;
 829         var->right_margin = mode->right_margin;
 830         var->upper_margin = mode->upper_margin;
 831         var->lower_margin = mode->lower_margin;
 832         var->hsync_len = mode->hsync_len;
 833         var->vsync_len = mode->vsync_len;
 834         var->sync = mode->sync;
 835         var->vmode = mode->vmode & FB_VMODE_MASK;
 836 }
 837
 838 /**
 839  * fb_mode_is_equal - compare 2 videomodes
 840  * @mode1: first videomode
 841  * @mode2: second videomode
 842  *
 843  * RETURNS:
 844  * 1 if equal, 0 if not
 845  */
 846 int fb_mode_is_equal(const struct fb_videomode *mode1,
 847                      const struct fb_videomode *mode2)
 848 {
 849         return (mode1->xres         == mode2->xres &&
 850                 mode1->yres         == mode2->yres &&
 851                 mode1->pixclock     == mode2->pixclock &&
 852                 mode1->hsync_len    == mode2->hsync_len &&
 853                 mode1->vsync_len    == mode2->vsync_len &&
 854                 mode1->left_margin  == mode2->left_margin &&
 855                 mode1->right_margin == mode2->right_margin &&
 856                 mode1->upper_margin == mode2->upper_margin &&
 857                 mode1->lower_margin == mode2->lower_margin &&
 858                 mode1->sync         == mode2->sync &&
 859                 mode1->vmode        == mode2->vmode);
 860 }
 861
 862 /**
 863  * fb_find_best_mode - find best matching videomode
 864  * @var: pointer to struct fb_var_screeninfo
 865  * @head: pointer to struct list_head of modelist
 866  *
 867  * RETURNS:
 868  * struct fb_videomode, NULL if none found
 869  *
 870  * IMPORTANT:
 871  * This function assumes that all modelist entries in
 872  * info->modelist are valid.
 873  *
 874  * NOTES:
 875  * Finds best matching videomode which has an equal or greater dimension than
 876  * var->xres and var->yres.  If more than 1 videomode is found, will return
 877  * the videomode with the highest refresh rate
 878  */
 879 const struct fb_videomode *fb_find_best_mode(const struct fb_var_screeninfo *var,
 880                                              struct list_head *head)
 881 {
 882         struct list_head *pos;
 883         struct fb_modelist *modelist;
 884         struct fb_videomode *mode, *best = NULL;
 885         u32 diff = -1;
 886
 887         list_for_each(pos, head) {
 888                 u32 d;
 889
 890                 modelist = list_entry(pos, struct fb_modelist, list);
 891                 mode = &modelist->mode;
 892
 893                 if (mode->xres >= var->xres && mode->yres >= var->yres) {
 894                         d = (mode->xres - var->xres) +
 895                                 (mode->yres - var->yres);
 896                         if (diff > d) {
 897                                 diff = d;
 898                                 best = mode;
 899                         } else if (diff == d && best &&
 900                                    mode->refresh > best->refresh)
 901                                 best = mode;
 902                 }
 903         }
 904         return best;
 905 }
 906
 907 /**
 908  * fb_find_nearest_mode - find closest videomode
 909  *
 910  * @mode: pointer to struct fb_videomode
 911  * @head: pointer to modelist
 912  *
 913  * Finds best matching videomode, smaller or greater in dimension.
 914  * If more than 1 videomode is found, will return the videomode with
 915  * the closest refresh rate.
 916  */
 917 const struct fb_videomode *fb_find_nearest_mode(const struct fb_videomode *mode,
 918                                                 struct list_head *head)
 919 {
 920         struct list_head *pos;
 921         struct fb_modelist *modelist;
 922         struct fb_videomode *cmode, *best = NULL;
 923         u32 diff = -1, diff_refresh = -1;
 924
 925         list_for_each(pos, head) {
 926                 u32 d;
 927
 928                 modelist = list_entry(pos, struct fb_modelist, list);
 929                 cmode = &modelist->mode;
 930
 931                 d = abs(cmode->xres - mode->xres) +
 932                         abs(cmode->yres - mode->yres);
 933                 if (diff > d) {
 934                         diff = d;
 935                         diff_refresh = abs(cmode->refresh - mode->refresh);
 936                         best = cmode;
 937                 } else if (diff == d) {
 938                         d = abs(cmode->refresh - mode->refresh);
 939                         if (diff_refresh > d) {
 940                                 diff_refresh = d;
 941                                 best = cmode;
 942                         }
 943                 }
 944         }
 945
 946         return best;
 947 }
 948
 949 /**
 950  * fb_match_mode - find a videomode which exactly matches the timings in var
 951  * @var: pointer to struct fb_var_screeninfo
 952  * @head: pointer to struct list_head of modelist
 953  *
 954  * RETURNS:
 955  * struct fb_videomode, NULL if none found
 956  */
 957 const struct fb_videomode *fb_match_mode(const struct fb_var_screeninfo *var,
 958                                          struct list_head *head)
 959 {
 960         struct list_head *pos;
 961         struct fb_modelist *modelist;
 962         struct fb_videomode *m, mode;
 963
 964         fb_var_to_videomode(&mode, var);
 965         list_for_each(pos, head) {
 966                 modelist = list_entry(pos, struct fb_modelist, list);
 967                 m = &modelist->mode;
 968                 if (fb_mode_is_equal(m, &mode))
 969                         return m;
 970         }
 971         return NULL;
 972 }
 973
 974 /**
 975  * fb_add_videomode - adds videomode entry to modelist
 976  * @mode: videomode to add
 977  * @head: struct list_head of modelist
 978  *
 979  * NOTES:
 980  * Will only add unmatched mode entries
 981  */
 982 int fb_add_videomode(const struct fb_videomode *mode, struct list_head *head)
 983 {
 984         struct list_head *pos;
 985         struct fb_modelist *modelist;
 986         struct fb_videomode *m;
 987         int found = 0;
 988
 989         list_for_each(pos, head) {
 990                 modelist = list_entry(pos, struct fb_modelist, list);
 991                 m = &modelist->mode;
 992                 if (fb_mode_is_equal(m, mode)) {
 993                         found = 1;
 994                         break;
 995                 }
 996         }
 997         if (!found) {
 998                 modelist = kmalloc(sizeof(struct fb_modelist),
 999                                                   GFP_KERNEL);
1000
1001                 if (!modelist)
1002                         return -ENOMEM;
1003                 modelist->mode = *mode;
1004                 list_add(&modelist->list, head);
1005         }
1006         return 0;
1007 }
1008
1009 /**
1010  * fb_delete_videomode - removed videomode entry from modelist
1011  * @mode: videomode to remove
1012  * @head: struct list_head of modelist
1013  *
1014  * NOTES:
1015  * Will remove all matching mode entries
1016  */
1017 void fb_delete_videomode(const struct fb_videomode *mode,
1018                          struct list_head *head)
1019 {
1020         struct list_head *pos, *n;
1021         struct fb_modelist *modelist;
1022         struct fb_videomode *m;
1023
1024         list_for_each_safe(pos, n, head) {
1025                 modelist = list_entry(pos, struct fb_modelist, list);
1026                 m = &modelist->mode;
1027                 if (fb_mode_is_equal(m, mode)) {
1028                         list_del(pos);
1029                         kfree(pos);
1030                 }
1031         }
1032 }
1033
1034 /**
1035  * fb_destroy_modelist - destroy modelist
1036  * @head: struct list_head of modelist
1037  */
1038 void fb_destroy_modelist(struct list_head *head)
1039 {
1040         struct list_head *pos, *n;
1041
1042         list_for_each_safe(pos, n, head) {
1043                 list_del(pos);
1044                 kfree(pos);
1045         }
1046 }
1047 EXPORT_SYMBOL_GPL(fb_destroy_modelist);
1048
1049 /**
1050  * fb_videomode_to_modelist - convert mode array to mode list
1051  * @modedb: array of struct fb_videomode
1052  * @num: number of entries in array
1053  * @head: struct list_head of modelist
1054  */
1055 void fb_videomode_to_modelist(const struct fb_videomode *modedb, int num,
1056                               struct list_head *head)
1057 {
1058         int i;
1059
1060         INIT_LIST_HEAD(head);
1061
1062         for (i = 0; i < num; i++) {
1063                 if (fb_add_videomode(&modedb[i], head))
1064                         return;
1065         }
1066 }
1067
1068 const struct fb_videomode *fb_find_best_display(const struct fb_monspecs *specs,
1069                                                 struct list_head *head)
1070 {
1071         struct list_head *pos;
1072         struct fb_modelist *modelist;
1073         const struct fb_videomode *m, *m1 = NULL, *md = NULL, *best = NULL;
1074         int first = 0;
1075
1076         if (!head->prev || !head->next || list_empty(head))
1077                 goto finished;
1078
1079         /* get the first detailed mode and the very first mode */
1080         list_for_each(pos, head) {
1081                 modelist = list_entry(pos, struct fb_modelist, list);
1082                 m = &modelist->mode;
1083
1084                 if (!first) {
1085                         m1 = m;
1086                         first = 1;
1087                 }
1088
1089                 if (m->flag & FB_MODE_IS_FIRST) {
1090                         md = m;
1091                         break;
1092                 }
1093         }
1094
1095         /* first detailed timing is preferred */
1096         if (specs->misc & FB_MISC_1ST_DETAIL) {
1097                 best = md;
1098                 goto finished;
1099         }
1100
1101         /* find best mode based on display width and height */
1102         if (specs->max_x && specs->max_y) {
1103                 struct fb_var_screeninfo var;
1104
1105                 memset(&var, 0, sizeof(struct fb_var_screeninfo));
1106                 var.xres = (specs->max_x * 7200)/254;
1107                 var.yres = (specs->max_y * 7200)/254;
1108                 m = fb_find_best_mode(&var, head);
1109                 if (m) {
1110                         best = m;
1111                         goto finished;
1112                 }
1113         }
1114
1115         /* use first detailed mode */
1116         if (md) {
1117                 best = md;
1118                 goto finished;
1119         }
1120
1121         /* last resort, use the very first mode */
1122         best = m1;
1123 finished:
1124         return best;
1125 }
1126 EXPORT_SYMBOL(fb_find_best_display);
1127
1128 EXPORT_SYMBOL(fb_videomode_to_var);
1129 EXPORT_SYMBOL(fb_var_to_videomode);
1130 EXPORT_SYMBOL(fb_mode_is_equal);
1131 EXPORT_SYMBOL(fb_add_videomode);
1132 EXPORT_SYMBOL(fb_match_mode);
1133 EXPORT_SYMBOL(fb_find_best_mode);
1134 EXPORT_SYMBOL(fb_find_nearest_mode);
1135 EXPORT_SYMBOL(fb_videomode_to_modelist);
1136 EXPORT_SYMBOL(fb_find_mode);
1137 EXPORT_SYMBOL(fb_find_mode_cvt);