drivers/video/efifb.c

   1 /*
   2  * Framebuffer driver for EFI/UEFI based system
   3  *
   4  * (c) 2006 Edgar Hucek <gimli@dark-green.com>
   5  * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
   6  *
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/errno.h>
  12 #include <linux/fb.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/screen_info.h>
  15 #include <linux/dmi.h>
  16 #include <linux/pci.h>
  17 #include <video/vga.h>
  18
  19 static struct fb_var_screeninfo efifb_defined __devinitdata = {
  20         .activate               = FB_ACTIVATE_NOW,
  21         .height                 = -1,
  22         .width                  = -1,
  23         .right_margin           = 32,
  24         .upper_margin           = 16,
  25         .lower_margin           = 4,
  26         .vsync_len              = 4,
  27         .vmode                  = FB_VMODE_NONINTERLACED,
  28 };
  29
  30 static struct fb_fix_screeninfo efifb_fix __devinitdata = {
  31         .id                     = "EFI VGA",
  32         .type                   = FB_TYPE_PACKED_PIXELS,
  33         .accel                  = FB_ACCEL_NONE,
  34         .visual                 = FB_VISUAL_TRUECOLOR,
  35 };
  36
  37 enum {
  38         M_I17,          /* 17-Inch iMac */
  39         M_I20,          /* 20-Inch iMac */
  40         M_I20_SR,       /* 20-Inch iMac (Santa Rosa) */
  41         M_I24,          /* 24-Inch iMac */
  42         M_I24_8_1,      /* 24-Inch iMac, 8,1th gen */
  43         M_I24_10_1,     /* 24-Inch iMac, 10,1th gen */
  44         M_I27_11_1,     /* 27-Inch iMac, 11,1th gen */
  45         M_MINI,         /* Mac Mini */
  46         M_MINI_3_1,     /* Mac Mini, 3,1th gen */
  47         M_MINI_4_1,     /* Mac Mini, 4,1th gen */
  48         M_MB,           /* MacBook */
  49         M_MB_2,         /* MacBook, 2nd rev. */
  50         M_MB_3,         /* MacBook, 3rd rev. */
  51         M_MB_5_1,       /* MacBook, 5th rev. */
  52         M_MB_6_1,       /* MacBook, 6th rev. */
  53         M_MB_7_1,       /* MacBook, 7th rev. */
  54         M_MB_SR,        /* MacBook, 2nd gen, (Santa Rosa) */
  55         M_MBA,          /* MacBook Air */
  56         M_MBA_3,        /* Macbook Air, 3rd rev */
  57         M_MBP,          /* MacBook Pro */
  58         M_MBP_2,        /* MacBook Pro 2nd gen */
  59         M_MBP_2_2,      /* MacBook Pro 2,2nd gen */
  60         M_MBP_SR,       /* MacBook Pro (Santa Rosa) */
  61         M_MBP_4,        /* MacBook Pro, 4th gen */
  62         M_MBP_5_1,    /* MacBook Pro, 5,1th gen */
  63         M_MBP_5_2,      /* MacBook Pro, 5,2th gen */
  64         M_MBP_5_3,      /* MacBook Pro, 5,3rd gen */
  65         M_MBP_6_1,      /* MacBook Pro, 6,1th gen */
  66         M_MBP_6_2,      /* MacBook Pro, 6,2th gen */
  67         M_MBP_7_1,      /* MacBook Pro, 7,1th gen */
  68         M_MBP_8_2,      /* MacBook Pro, 8,2nd gen */
  69         M_UNKNOWN       /* placeholder */
  70 };
  71
  72 #define OVERRIDE_NONE   0x0
  73 #define OVERRIDE_BASE   0x1
  74 #define OVERRIDE_STRIDE 0x2
  75 #define OVERRIDE_HEIGHT 0x4
  76 #define OVERRIDE_WIDTH  0x8
  77
  78 static struct efifb_dmi_info {
  79         char *optname;
  80         unsigned long base;
  81         int stride;
  82         int width;
  83         int height;
  84         int flags;
  85 } dmi_list[] __initdata = {
  86         [M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
  87         [M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE }, /* guess */
  88         [M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE },
  89         [M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE }, /* guess */
  90         [M_I24_8_1] = { "imac8", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
  91         [M_I24_10_1] = { "imac10", 0xc0010000, 2048 * 4, 1920, 1080, OVERRIDE_NONE },
  92         [M_I27_11_1] = { "imac11", 0xc0010000, 2560 * 4, 2560, 1440, OVERRIDE_NONE },
  93         [M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768, OVERRIDE_NONE },
  94         [M_MINI_3_1] = { "mini31", 0x40010000, 1024 * 4, 1024, 768, OVERRIDE_NONE },
  95         [M_MINI_4_1] = { "mini41", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
  96         [M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
  97         [M_MB_5_1] = { "macbook51", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
  98         [M_MB_6_1] = { "macbook61", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
  99         [M_MB_7_1] = { "macbook71", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
 100         [M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
 101         /* 11" Macbook Air 3,1 passes the wrong stride */
 102         [M_MBA_3] = { "mba3", 0, 2048 * 4, 0, 0, OVERRIDE_STRIDE },
 103         [M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
 104         [M_MBP_2] = { "mbp2", 0, 0, 0, 0, OVERRIDE_NONE }, /* placeholder */
 105         [M_MBP_2_2] = { "mbp22", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
 106         [M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
 107         [M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
 108         [M_MBP_5_1] = { "mbp51", 0xc0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
 109         [M_MBP_5_2] = { "mbp52", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
 110         [M_MBP_5_3] = { "mbp53", 0xd0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
 111         [M_MBP_6_1] = { "mbp61", 0x90030000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
 112         [M_MBP_6_2] = { "mbp62", 0x90030000, 2048 * 4, 1680, 1050, OVERRIDE_NONE },
 113         [M_MBP_7_1] = { "mbp71", 0xc0010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
 114         [M_MBP_8_2] = { "mbp82", 0x90010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
 115         [M_UNKNOWN] = { NULL, 0, 0, 0, 0, OVERRIDE_NONE }
 116 };
 117
 118 static int set_system(const struct dmi_system_id *id);
 119
 120 #define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid)               \
 121         { set_system, name, {                                   \
 122                 DMI_MATCH(DMI_BIOS_VENDOR, vendor),             \
 123                 DMI_MATCH(DMI_PRODUCT_NAME, name) },            \
 124           &dmi_list[enumid] }
 125
 126 static const struct dmi_system_id dmi_system_table[] __initconst = {
 127         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
 128         /* At least one of these two will be right; maybe both? */
 129         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
 130         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
 131         /* At least one of these two will be right; maybe both? */
 132         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
 133         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
 134         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
 135         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac8,1", M_I24_8_1),
 136         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac10,1", M_I24_10_1),
 137         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac11,1", M_I27_11_1),
 138         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
 139         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini3,1", M_MINI_3_1),
 140         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini4,1", M_MINI_4_1),
 141         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
 142         /* At least one of these two will be right; maybe both? */
 143         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
 144         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
 145         /* At least one of these two will be right; maybe both? */
 146         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
 147         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
 148         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
 149         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook5,1", M_MB_5_1),
 150         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook6,1", M_MB_6_1),
 151         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook7,1", M_MB_7_1),
 152         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
 153         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir3,1", M_MBA_3),
 154         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
 155         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
 156         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,2", M_MBP_2_2),
 157         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
 158         EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
 159         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
 160         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
 161         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,1", M_MBP_5_1),
 162         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,2", M_MBP_5_2),
 163         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,3", M_MBP_5_3),
 164         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,1", M_MBP_6_1),
 165         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,2", M_MBP_6_2),
 166         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro7,1", M_MBP_7_1),
 167         EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro8,2", M_MBP_8_2),
 168         {},
 169 };
 170
 171 #define choose_value(dmivalue, fwvalue, field, flags) ({        \
 172                 typeof(fwvalue) _ret_ = fwvalue;                \
 173                 if ((flags) & (field))                          \
 174                         _ret_ = dmivalue;                       \
 175                 else if ((fwvalue) == 0)                        \
 176                         _ret_ = dmivalue;                       \
 177                 _ret_;                                          \
 178         })
 179
 180 static int set_system(const struct dmi_system_id *id)
 181 {
 182         struct efifb_dmi_info *info = id->driver_data;
 183
 184         if (info->base == 0 && info->height == 0 && info->width == 0
 185                         && info->stride == 0)
 186                 return 0;
 187
 188         /* Trust the bootloader over the DMI tables */
 189         if (screen_info.lfb_base == 0) {
 190 #if defined(CONFIG_PCI)
 191                 struct pci_dev *dev = NULL;
 192                 int found_bar = 0;
 193 #endif
 194                 if (info->base) {
 195                         screen_info.lfb_base = choose_value(info->base,
 196                                 screen_info.lfb_base, OVERRIDE_BASE,
 197                                 info->flags);
 198
 199 #if defined(CONFIG_PCI)
 200                         /* make sure that the address in the table is actually
 201                          * on a VGA device's PCI BAR */
 202
 203                         for_each_pci_dev(dev) {
 204                                 int i;
 205                                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
 206                                         continue;
 207                                 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 208                                         resource_size_t start, end;
 209
 210                                         start = pci_resource_start(dev, i);
 211                                         if (start == 0)
 212                                                 break;
 213                                         end = pci_resource_end(dev, i);
 214                                         if (screen_info.lfb_base >= start &&
 215                                             screen_info.lfb_base < end) {
 216                                                 found_bar = 1;
 217                                         }
 218                                 }
 219                         }
 220                         if (!found_bar)
 221                                 screen_info.lfb_base = 0;
 222 #endif
 223                 }
 224         }
 225         if (screen_info.lfb_base) {
 226                 screen_info.lfb_linelength = choose_value(info->stride,
 227                         screen_info.lfb_linelength, OVERRIDE_STRIDE,
 228                         info->flags);
 229                 screen_info.lfb_width = choose_value(info->width,
 230                         screen_info.lfb_width, OVERRIDE_WIDTH,
 231                         info->flags);
 232                 screen_info.lfb_height = choose_value(info->height,
 233                         screen_info.lfb_height, OVERRIDE_HEIGHT,
 234                         info->flags);
 235                 if (screen_info.orig_video_isVGA == 0)
 236                         screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
 237         } else {
 238                 screen_info.lfb_linelength = 0;
 239                 screen_info.lfb_width = 0;
 240                 screen_info.lfb_height = 0;
 241                 screen_info.orig_video_isVGA = 0;
 242                 return 0;
 243         }
 244
 245         printk(KERN_INFO "efifb: dmi detected %s - framebuffer at 0x%08x "
 246                          "(%dx%d, stride %d)\n", id->ident,
 247                          screen_info.lfb_base, screen_info.lfb_width,
 248                          screen_info.lfb_height, screen_info.lfb_linelength);
 249
 250
 251         return 1;
 252 }
 253
 254 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
 255                            unsigned blue, unsigned transp,
 256                            struct fb_info *info)
 257 {
 258         /*
 259          *  Set a single color register. The values supplied are
 260          *  already rounded down to the hardware's capabilities
 261          *  (according to the entries in the `var' structure). Return
 262          *  != 0 for invalid regno.
 263          */
 264
 265         if (regno >= info->cmap.len)
 266                 return 1;
 267
 268         if (regno < 16) {
 269                 red   >>= 8;
 270                 green >>= 8;
 271                 blue  >>= 8;
 272                 ((u32 *)(info->pseudo_palette))[regno] =
 273                         (red   << info->var.red.offset)   |
 274                         (green << info->var.green.offset) |
 275                         (blue  << info->var.blue.offset);
 276         }
 277         return 0;
 278 }
 279
 280 static void efifb_destroy(struct fb_info *info)
 281 {
 282         if (info->screen_base)
 283                 iounmap(info->screen_base);
 284         release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 285         framebuffer_release(info);
 286 }
 287
 288 static struct fb_ops efifb_ops = {
 289         .owner          = THIS_MODULE,
 290         .fb_destroy     = efifb_destroy,
 291         .fb_setcolreg   = efifb_setcolreg,
 292         .fb_fillrect    = cfb_fillrect,
 293         .fb_copyarea    = cfb_copyarea,
 294         .fb_imageblit   = cfb_imageblit,
 295 };
 296
 297 static int __init efifb_setup(char *options)
 298 {
 299         char *this_opt;
 300         int i;
 301
 302         if (!options || !*options)
 303                 return 0;
 304
 305         while ((this_opt = strsep(&options, ",")) != NULL) {
 306                 if (!*this_opt) continue;
 307
 308                 for (i = 0; i < M_UNKNOWN; i++) {
 309                         if (!strcmp(this_opt, dmi_list[i].optname) &&
 310                                         dmi_list[i].base != 0) {
 311                                 screen_info.lfb_base = dmi_list[i].base;
 312                                 screen_info.lfb_linelength = dmi_list[i].stride;
 313                                 screen_info.lfb_width = dmi_list[i].width;
 314                                 screen_info.lfb_height = dmi_list[i].height;
 315                         }
 316                 }
 317                 if (!strncmp(this_opt, "base:", 5))
 318                         screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
 319                 else if (!strncmp(this_opt, "stride:", 7))
 320                         screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
 321                 else if (!strncmp(this_opt, "height:", 7))
 322                         screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
 323                 else if (!strncmp(this_opt, "width:", 6))
 324                         screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
 325         }
 326         return 0;
 327 }
 328
 329 static int __devinit efifb_probe(struct platform_device *dev)
 330 {
 331         struct fb_info *info;
 332         int err;
 333         unsigned int size_vmode;
 334         unsigned int size_remap;
 335         unsigned int size_total;
 336         int request_succeeded = 0;
 337
 338         if (!screen_info.lfb_depth)
 339                 screen_info.lfb_depth = 32;
 340         if (!screen_info.pages)
 341                 screen_info.pages = 1;
 342         if (!screen_info.lfb_base) {
 343                 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 344                 return -ENODEV;
 345         }
 346         printk(KERN_INFO "efifb: probing for efifb\n");
 347
 348         /* just assume they're all unset if any are */
 349         if (!screen_info.blue_size) {
 350                 screen_info.blue_size = 8;
 351                 screen_info.blue_pos = 0;
 352                 screen_info.green_size = 8;
 353                 screen_info.green_pos = 8;
 354                 screen_info.red_size = 8;
 355                 screen_info.red_pos = 16;
 356                 screen_info.rsvd_size = 8;
 357                 screen_info.rsvd_pos = 24;
 358         }
 359
 360         efifb_fix.smem_start = screen_info.lfb_base;
 361         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 362         efifb_defined.xres = screen_info.lfb_width;
 363         efifb_defined.yres = screen_info.lfb_height;
 364         efifb_fix.line_length = screen_info.lfb_linelength;
 365
 366         /*   size_vmode -- that is the amount of memory needed for the
 367          *                 used video mode, i.e. the minimum amount of
 368          *                 memory we need. */
 369         size_vmode = efifb_defined.yres * efifb_fix.line_length;
 370
 371         /*   size_total -- all video memory we have. Used for
 372          *                 entries, ressource allocation and bounds
 373          *                 checking. */
 374         size_total = screen_info.lfb_size;
 375         if (size_total < size_vmode)
 376                 size_total = size_vmode;
 377
 378         /*   size_remap -- the amount of video memory we are going to
 379          *                 use for efifb.  With modern cards it is no
 380          *                 option to simply use size_total as that
 381          *                 wastes plenty of kernel address space. */
 382         size_remap  = size_vmode * 2;
 383         if (size_remap > size_total)
 384                 size_remap = size_total;
 385         if (size_remap % PAGE_SIZE)
 386                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 387         efifb_fix.smem_len = size_remap;
 388
 389         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 390                 request_succeeded = 1;
 391         } else {
 392                 /* We cannot make this fatal. Sometimes this comes from magic
 393                    spaces our resource handlers simply don't know about */
 394                 printk(KERN_WARNING
 395                        "efifb: cannot reserve video memory at 0x%lx\n",
 396                         efifb_fix.smem_start);
 397         }
 398
 399         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 400         if (!info) {
 401                 printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
 402                 err = -ENOMEM;
 403                 goto err_release_mem;
 404         }
 405         info->pseudo_palette = info->par;
 406         info->par = NULL;
 407
 408         info->apertures = alloc_apertures(1);
 409         if (!info->apertures) {
 410                 err = -ENOMEM;
 411                 goto err_release_fb;
 412         }
 413         info->apertures->ranges[0].base = efifb_fix.smem_start;
 414         info->apertures->ranges[0].size = size_remap;
 415
 416         info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len);
 417         if (!info->screen_base) {
 418                 printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
 419                                 "0x%x @ 0x%lx\n",
 420                         efifb_fix.smem_len, efifb_fix.smem_start);
 421                 err = -EIO;
 422                 goto err_release_fb;
 423         }
 424
 425         printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
 426                "using %dk, total %dk\n",
 427                efifb_fix.smem_start, info->screen_base,
 428                size_remap/1024, size_total/1024);
 429         printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 430                efifb_defined.xres, efifb_defined.yres,
 431                efifb_defined.bits_per_pixel, efifb_fix.line_length,
 432                screen_info.pages);
 433
 434         efifb_defined.xres_virtual = efifb_defined.xres;
 435         efifb_defined.yres_virtual = efifb_fix.smem_len /
 436                                         efifb_fix.line_length;
 437         printk(KERN_INFO "efifb: scrolling: redraw\n");
 438         efifb_defined.yres_virtual = efifb_defined.yres;
 439
 440         /* some dummy values for timing to make fbset happy */
 441         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 442                                         1000 / efifb_defined.yres;
 443         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 444         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 445
 446         efifb_defined.red.offset    = screen_info.red_pos;
 447         efifb_defined.red.length    = screen_info.red_size;
 448         efifb_defined.green.offset  = screen_info.green_pos;
 449         efifb_defined.green.length  = screen_info.green_size;
 450         efifb_defined.blue.offset   = screen_info.blue_pos;
 451         efifb_defined.blue.length   = screen_info.blue_size;
 452         efifb_defined.transp.offset = screen_info.rsvd_pos;
 453         efifb_defined.transp.length = screen_info.rsvd_size;
 454
 455         printk(KERN_INFO "efifb: %s: "
 456                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 457                "Truecolor",
 458                screen_info.rsvd_size,
 459                screen_info.red_size,
 460                screen_info.green_size,
 461                screen_info.blue_size,
 462                screen_info.rsvd_pos,
 463                screen_info.red_pos,
 464                screen_info.green_pos,
 465                screen_info.blue_pos);
 466
 467         efifb_fix.ypanstep  = 0;
 468         efifb_fix.ywrapstep = 0;
 469
 470         info->fbops = &efifb_ops;
 471         info->var = efifb_defined;
 472         info->fix = efifb_fix;
 473         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 474
 475         if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
 476                 printk(KERN_ERR "efifb: cannot allocate colormap\n");
 477                 goto err_unmap;
 478         }
 479         if ((err = register_framebuffer(info)) < 0) {
 480                 printk(KERN_ERR "efifb: cannot register framebuffer\n");
 481                 goto err_fb_dealoc;
 482         }
 483         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 484                 info->node, info->fix.id);
 485         return 0;
 486
 487 err_fb_dealoc:
 488         fb_dealloc_cmap(&info->cmap);
 489 err_unmap:
 490         iounmap(info->screen_base);
 491 err_release_fb:
 492         framebuffer_release(info);
 493 err_release_mem:
 494         if (request_succeeded)
 495                 release_mem_region(efifb_fix.smem_start, size_total);
 496         return err;
 497 }
 498
 499 static struct platform_driver efifb_driver = {
 500         .probe  = efifb_probe,
 501         .driver = {
 502                 .name   = "efifb",
 503         },
 504 };
 505
 506 static struct platform_device efifb_device = {
 507         .name   = "efifb",
 508 };
 509
 510 static int __init efifb_init(void)
 511 {
 512         int ret;
 513         char *option = NULL;
 514
 515         dmi_check_system(dmi_system_table);
 516
 517         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 518                 return -ENODEV;
 519
 520         if (fb_get_options("efifb", &option))
 521                 return -ENODEV;
 522         efifb_setup(option);
 523
 524         /* We don't get linelength from UGA Draw Protocol, only from
 525          * EFI Graphics Protocol.  So if it's not in DMI, and it's not
 526          * passed in from the user, we really can't use the framebuffer.
 527          */
 528         if (!screen_info.lfb_linelength)
 529                 return -ENODEV;
 530
 531         ret = platform_driver_register(&efifb_driver);
 532
 533         if (!ret) {
 534                 ret = platform_device_register(&efifb_device);
 535                 if (ret)
 536                         platform_driver_unregister(&efifb_driver);
 537         }
 538         return ret;
 539 }
 540 module_init(efifb_init);
 541
 542 MODULE_LICENSE("GPL");