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