drivers/video/hgafb.c

   1 /*
   2  * linux/drivers/video/hgafb.c -- Hercules graphics adaptor frame buffer device
   3  *
   4  *      Created 25 Nov 1999 by Ferenc Bakonyi (fero@drama.obuda.kando.hu)
   5  *      Based on skeletonfb.c by Geert Uytterhoeven and
   6  *               mdacon.c by Andrew Apted
   7  *
   8  * History:
   9  *
  10  * - Revision 0.1.8 (23 Oct 2002): Ported to new framebuffer api.
  11  *
  12  * - Revision 0.1.7 (23 Jan 2001): fix crash resulting from MDA only cards
  13  *                                 being detected as Hercules.   (Paul G.)
  14  * - Revision 0.1.6 (17 Aug 2000): new style structs
  15  *                                 documentation
  16  * - Revision 0.1.5 (13 Mar 2000): spinlocks instead of saveflags();cli();etc
  17  *                                 minor fixes
  18  * - Revision 0.1.4 (24 Jan 2000): fixed a bug in hga_card_detect() for
  19  *                                  HGA-only systems
  20  * - Revision 0.1.3 (22 Jan 2000): modified for the new fb_info structure
  21  *                                 screen is cleared after rmmod
  22  *                                 virtual resolutions
  23  *                                 module parameter 'nologo={0|1}'
  24  *                                 the most important: boot logo :)
  25  * - Revision 0.1.0  (6 Dec 1999): faster scrolling and minor fixes
  26  * - First release  (25 Nov 1999)
  27  *
  28  * This file is subject to the terms and conditions of the GNU General Public
  29  * License.  See the file COPYING in the main directory of this archive
  30  * for more details.
  31  */
  32
  33 #include <linux/module.h>
  34 #include <linux/kernel.h>
  35 #include <linux/errno.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/string.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/delay.h>
  41 #include <linux/fb.h>
  42 #include <linux/init.h>
  43 #include <linux/ioport.h>
  44 #include <linux/platform_device.h>
  45 #include <asm/io.h>
  46 #include <asm/vga.h>
  47
  48 #if 0
  49 #define DPRINTK(args...) printk(KERN_DEBUG __FILE__": " ##args)
  50 #else
  51 #define DPRINTK(args...)
  52 #endif
  53
  54 #if 0
  55 #define CHKINFO(ret) if (info != &fb_info) { printk(KERN_DEBUG __FILE__": This should never happen, line:%d \n", __LINE__); return ret; }
  56 #else
  57 #define CHKINFO(ret)
  58 #endif
  59
  60 /* Description of the hardware layout */
  61
  62 static void __iomem *hga_vram;                  /* Base of video memory */
  63 static unsigned long hga_vram_len;              /* Size of video memory */
  64
  65 #define HGA_ROWADDR(row) ((row%4)*8192 + (row>>2)*90)
  66 #define HGA_TXT                 0
  67 #define HGA_GFX                 1
  68
  69 static inline u8 __iomem * rowaddr(struct fb_info *info, u_int row)
  70 {
  71         return info->screen_base + HGA_ROWADDR(row);
  72 }
  73
  74 static int hga_mode = -1;                       /* 0 = txt, 1 = gfx mode */
  75
  76 static enum { TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } hga_type;
  77 static char *hga_type_name;
  78
  79 #define HGA_INDEX_PORT          0x3b4           /* Register select port */
  80 #define HGA_VALUE_PORT          0x3b5           /* Register value port */
  81 #define HGA_MODE_PORT           0x3b8           /* Mode control port */
  82 #define HGA_STATUS_PORT         0x3ba           /* Status and Config port */
  83 #define HGA_GFX_PORT            0x3bf           /* Graphics control port */
  84
  85 /* HGA register values */
  86
  87 #define HGA_CURSOR_BLINKING     0x00
  88 #define HGA_CURSOR_OFF          0x20
  89 #define HGA_CURSOR_SLOWBLINK    0x60
  90
  91 #define HGA_MODE_GRAPHICS       0x02
  92 #define HGA_MODE_VIDEO_EN       0x08
  93 #define HGA_MODE_BLINK_EN       0x20
  94 #define HGA_MODE_GFX_PAGE1      0x80
  95
  96 #define HGA_STATUS_HSYNC        0x01
  97 #define HGA_STATUS_VSYNC        0x80
  98 #define HGA_STATUS_VIDEO        0x08
  99
 100 #define HGA_CONFIG_COL132       0x08
 101 #define HGA_GFX_MODE_EN         0x01
 102 #define HGA_GFX_PAGE_EN         0x02
 103
 104 /* Global locks */
 105
 106 static DEFINE_SPINLOCK(hga_reg_lock);
 107
 108 /* Framebuffer driver structures */
 109
 110 static struct fb_var_screeninfo __initdata hga_default_var = {
 111         .xres           = 720,
 112         .yres           = 348,
 113         .xres_virtual   = 720,
 114         .yres_virtual   = 348,
 115         .bits_per_pixel = 1,
 116         .red            = {0, 1, 0},
 117         .green          = {0, 1, 0},
 118         .blue           = {0, 1, 0},
 119         .transp         = {0, 0, 0},
 120         .height         = -1,
 121         .width          = -1,
 122 };
 123
 124 static struct fb_fix_screeninfo __initdata hga_fix = {
 125         .id             = "HGA",
 126         .type           = FB_TYPE_PACKED_PIXELS,        /* (not sure) */
 127         .visual         = FB_VISUAL_MONO10,
 128         .xpanstep       = 8,
 129         .ypanstep       = 8,
 130         .line_length    = 90,
 131         .accel          = FB_ACCEL_NONE
 132 };
 133
 134 /* Don't assume that tty1 will be the initial current console. */
 135 static int release_io_port = 0;
 136 static int release_io_ports = 0;
 137 static int nologo = 0;
 138
 139 /* -------------------------------------------------------------------------
 140  *
 141  * Low level hardware functions
 142  *
 143  * ------------------------------------------------------------------------- */
 144
 145 static void write_hga_b(unsigned int val, unsigned char reg)
 146 {
 147         outb_p(reg, HGA_INDEX_PORT);
 148         outb_p(val, HGA_VALUE_PORT);
 149 }
 150
 151 static void write_hga_w(unsigned int val, unsigned char reg)
 152 {
 153         outb_p(reg,   HGA_INDEX_PORT); outb_p(val >> 8,   HGA_VALUE_PORT);
 154         outb_p(reg+1, HGA_INDEX_PORT); outb_p(val & 0xff, HGA_VALUE_PORT);
 155 }
 156
 157 static int test_hga_b(unsigned char val, unsigned char reg)
 158 {
 159         outb_p(reg, HGA_INDEX_PORT);
 160         outb  (val, HGA_VALUE_PORT);
 161         udelay(20); val = (inb_p(HGA_VALUE_PORT) == val);
 162         return val;
 163 }
 164
 165 static void hga_clear_screen(void)
 166 {
 167         unsigned char fillchar = 0xbf; /* magic */
 168         unsigned long flags;
 169
 170         spin_lock_irqsave(&hga_reg_lock, flags);
 171         if (hga_mode == HGA_TXT)
 172                 fillchar = ' ';
 173         else if (hga_mode == HGA_GFX)
 174                 fillchar = 0x00;
 175         spin_unlock_irqrestore(&hga_reg_lock, flags);
 176         if (fillchar != 0xbf)
 177                 memset_io(hga_vram, fillchar, hga_vram_len);
 178 }
 179
 180 static void hga_txt_mode(void)
 181 {
 182         unsigned long flags;
 183
 184         spin_lock_irqsave(&hga_reg_lock, flags);
 185         outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_BLINK_EN, HGA_MODE_PORT);
 186         outb_p(0x00, HGA_GFX_PORT);
 187         outb_p(0x00, HGA_STATUS_PORT);
 188
 189         write_hga_b(0x61, 0x00);        /* horizontal total */
 190         write_hga_b(0x50, 0x01);        /* horizontal displayed */
 191         write_hga_b(0x52, 0x02);        /* horizontal sync pos */
 192         write_hga_b(0x0f, 0x03);        /* horizontal sync width */
 193
 194         write_hga_b(0x19, 0x04);        /* vertical total */
 195         write_hga_b(0x06, 0x05);        /* vertical total adjust */
 196         write_hga_b(0x19, 0x06);        /* vertical displayed */
 197         write_hga_b(0x19, 0x07);        /* vertical sync pos */
 198
 199         write_hga_b(0x02, 0x08);        /* interlace mode */
 200         write_hga_b(0x0d, 0x09);        /* maximum scanline */
 201         write_hga_b(0x0c, 0x0a);        /* cursor start */
 202         write_hga_b(0x0d, 0x0b);        /* cursor end */
 203
 204         write_hga_w(0x0000, 0x0c);      /* start address */
 205         write_hga_w(0x0000, 0x0e);      /* cursor location */
 206
 207         hga_mode = HGA_TXT;
 208         spin_unlock_irqrestore(&hga_reg_lock, flags);
 209 }
 210
 211 static void hga_gfx_mode(void)
 212 {
 213         unsigned long flags;
 214
 215         spin_lock_irqsave(&hga_reg_lock, flags);
 216         outb_p(0x00, HGA_STATUS_PORT);
 217         outb_p(HGA_GFX_MODE_EN, HGA_GFX_PORT);
 218         outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
 219
 220         write_hga_b(0x35, 0x00);        /* horizontal total */
 221         write_hga_b(0x2d, 0x01);        /* horizontal displayed */
 222         write_hga_b(0x2e, 0x02);        /* horizontal sync pos */
 223         write_hga_b(0x07, 0x03);        /* horizontal sync width */
 224
 225         write_hga_b(0x5b, 0x04);        /* vertical total */
 226         write_hga_b(0x02, 0x05);        /* vertical total adjust */
 227         write_hga_b(0x57, 0x06);        /* vertical displayed */
 228         write_hga_b(0x57, 0x07);        /* vertical sync pos */
 229
 230         write_hga_b(0x02, 0x08);        /* interlace mode */
 231         write_hga_b(0x03, 0x09);        /* maximum scanline */
 232         write_hga_b(0x00, 0x0a);        /* cursor start */
 233         write_hga_b(0x00, 0x0b);        /* cursor end */
 234
 235         write_hga_w(0x0000, 0x0c);      /* start address */
 236         write_hga_w(0x0000, 0x0e);      /* cursor location */
 237
 238         hga_mode = HGA_GFX;
 239         spin_unlock_irqrestore(&hga_reg_lock, flags);
 240 }
 241
 242 static void hga_show_logo(struct fb_info *info)
 243 {
 244 /*
 245         void __iomem *dest = hga_vram;
 246         char *logo = linux_logo_bw;
 247         int x, y;
 248
 249         for (y = 134; y < 134 + 80 ; y++) * this needs some cleanup *
 250                 for (x = 0; x < 10 ; x++)
 251                         writeb(~*(logo++),(dest + HGA_ROWADDR(y) + x + 40));
 252 */
 253 }
 254
 255 static void hga_pan(unsigned int xoffset, unsigned int yoffset)
 256 {
 257         unsigned int base;
 258         unsigned long flags;
 259
 260         base = (yoffset / 8) * 90 + xoffset;
 261         spin_lock_irqsave(&hga_reg_lock, flags);
 262         write_hga_w(base, 0x0c);        /* start address */
 263         spin_unlock_irqrestore(&hga_reg_lock, flags);
 264         DPRINTK("hga_pan: base:%d\n", base);
 265 }
 266
 267 static void hga_blank(int blank_mode)
 268 {
 269         unsigned long flags;
 270
 271         spin_lock_irqsave(&hga_reg_lock, flags);
 272         if (blank_mode) {
 273                 outb_p(0x00, HGA_MODE_PORT);    /* disable video */
 274         } else {
 275                 outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
 276         }
 277         spin_unlock_irqrestore(&hga_reg_lock, flags);
 278 }
 279
 280 static int __init hga_card_detect(void)
 281 {
 282         int count = 0;
 283         void __iomem *p, *q;
 284         unsigned short p_save, q_save;
 285
 286         hga_vram_len  = 0x08000;
 287
 288         hga_vram = ioremap(0xb0000, hga_vram_len);
 289
 290         if (request_region(0x3b0, 12, "hgafb"))
 291                 release_io_ports = 1;
 292         if (request_region(0x3bf, 1, "hgafb"))
 293                 release_io_port = 1;
 294
 295         /* do a memory check */
 296
 297         p = hga_vram;
 298         q = hga_vram + 0x01000;
 299
 300         p_save = readw(p); q_save = readw(q);
 301
 302         writew(0xaa55, p); if (readw(p) == 0xaa55) count++;
 303         writew(0x55aa, p); if (readw(p) == 0x55aa) count++;
 304         writew(p_save, p);
 305
 306         if (count != 2)
 307                 goto error;
 308
 309         /* Ok, there is definitely a card registering at the correct
 310          * memory location, so now we do an I/O port test.
 311          */
 312
 313         if (!test_hga_b(0x66, 0x0f))        /* cursor low register */
 314                 goto error;
 315
 316         if (!test_hga_b(0x99, 0x0f))     /* cursor low register */
 317                 goto error;
 318
 319         /* See if the card is a Hercules, by checking whether the vsync
 320          * bit of the status register is changing.  This test lasts for
 321          * approximately 1/10th of a second.
 322          */
 323
 324         p_save = q_save = inb_p(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
 325
 326         for (count=0; count < 50000 && p_save == q_save; count++) {
 327                 q_save = inb(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
 328                 udelay(2);
 329         }
 330
 331         if (p_save == q_save)
 332                 goto error;
 333
 334         switch (inb_p(HGA_STATUS_PORT) & 0x70) {
 335                 case 0x10:
 336                         hga_type = TYPE_HERCPLUS;
 337                         hga_type_name = "HerculesPlus";
 338                         break;
 339                 case 0x50:
 340                         hga_type = TYPE_HERCCOLOR;
 341                         hga_type_name = "HerculesColor";
 342                         break;
 343                 default:
 344                         hga_type = TYPE_HERC;
 345                         hga_type_name = "Hercules";
 346                         break;
 347         }
 348         return 1;
 349 error:
 350         if (release_io_ports)
 351                 release_region(0x3b0, 12);
 352         if (release_io_port)
 353                 release_region(0x3bf, 1);
 354         return 0;
 355 }
 356
 357 /**
 358  *      hgafb_open - open the framebuffer device
 359  *      @info:pointer to fb_info object containing info for current hga board
 360  *      @int:open by console system or userland.
 361  */
 362
 363 static int hgafb_open(struct fb_info *info, int init)
 364 {
 365         hga_gfx_mode();
 366         hga_clear_screen();
 367         if (!nologo) hga_show_logo(info);
 368         return 0;
 369 }
 370
 371 /**
 372  *      hgafb_open - open the framebuffer device
 373  *      @info:pointer to fb_info object containing info for current hga board
 374  *      @int:open by console system or userland.
 375  */
 376
 377 static int hgafb_release(struct fb_info *info, int init)
 378 {
 379         hga_txt_mode();
 380         hga_clear_screen();
 381         return 0;
 382 }
 383
 384 /**
 385  *      hgafb_setcolreg - set color registers
 386  *      @regno:register index to set
 387  *      @red:red value, unused
 388  *      @green:green value, unused
 389  *      @blue:blue value, unused
 390  *      @transp:transparency value, unused
 391  *      @info:unused
 392  *
 393  *      This callback function is used to set the color registers of a HGA
 394  *      board. Since we have only two fixed colors only @regno is checked.
 395  *      A zero is returned on success and 1 for failure.
 396  */
 397
 398 static int hgafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 399                            u_int transp, struct fb_info *info)
 400 {
 401         if (regno > 1)
 402                 return 1;
 403         return 0;
 404 }
 405
 406 /**
 407  *      hga_pan_display - pan or wrap the display
 408  *      @var:contains new xoffset, yoffset and vmode values
 409  *      @info:pointer to fb_info object containing info for current hga board
 410  *
 411  *      This function looks only at xoffset, yoffset and the %FB_VMODE_YWRAP
 412  *      flag in @var. If input parameters are correct it calls hga_pan() to
 413  *      program the hardware. @info->var is updated to the new values.
 414  *      A zero is returned on success and %-EINVAL for failure.
 415  */
 416
 417 static int hgafb_pan_display(struct fb_var_screeninfo *var,
 418                              struct fb_info *info)
 419 {
 420         if (var->vmode & FB_VMODE_YWRAP) {
 421                 if (var->yoffset < 0 ||
 422                     var->yoffset >= info->var.yres_virtual ||
 423                     var->xoffset)
 424                         return -EINVAL;
 425         } else {
 426                 if (var->xoffset + var->xres > info->var.xres_virtual
 427                  || var->yoffset + var->yres > info->var.yres_virtual
 428                  || var->yoffset % 8)
 429                         return -EINVAL;
 430         }
 431
 432         hga_pan(var->xoffset, var->yoffset);
 433         return 0;
 434 }
 435
 436 /**
 437  *      hgafb_blank - (un)blank the screen
 438  *      @blank_mode:blanking method to use
 439  *      @info:unused
 440  *
 441  *      Blank the screen if blank_mode != 0, else unblank.
 442  *      Implements VESA suspend and powerdown modes on hardware that supports
 443  *      disabling hsync/vsync:
 444  *              @blank_mode == 2 means suspend vsync,
 445  *              @blank_mode == 3 means suspend hsync,
 446  *              @blank_mode == 4 means powerdown.
 447  */
 448
 449 static int hgafb_blank(int blank_mode, struct fb_info *info)
 450 {
 451         hga_blank(blank_mode);
 452         return 0;
 453 }
 454
 455 /*
 456  * Accel functions
 457  */
 458 #ifdef CONFIG_FB_HGA_ACCEL
 459 static void hgafb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
 460 {
 461         u_int rows, y;
 462         u8 __iomem *dest;
 463
 464         y = rect->dy;
 465
 466         for (rows = rect->height; rows--; y++) {
 467                 dest = rowaddr(info, y) + (rect->dx >> 3);
 468                 switch (rect->rop) {
 469                 case ROP_COPY:
 470                         //fb_memset(dest, rect->color, (rect->width >> 3));
 471                         break;
 472                 case ROP_XOR:
 473                         fb_writeb(~(fb_readb(dest)), dest);
 474                         break;
 475                 }
 476         }
 477 }
 478
 479 static void hgafb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
 480 {
 481         u_int rows, y1, y2;
 482         u8 __iomem *src;
 483         u8 __iomem *dest;
 484
 485         if (area->dy <= area->sy) {
 486                 y1 = area->sy;
 487                 y2 = area->dy;
 488
 489                 for (rows = area->height; rows--; ) {
 490                         src = rowaddr(info, y1) + (area->sx >> 3);
 491                         dest = rowaddr(info, y2) + (area->dx >> 3);
 492                         //fb_memmove(dest, src, (area->width >> 3));
 493                         y1++;
 494                         y2++;
 495                 }
 496         } else {
 497                 y1 = area->sy + area->height - 1;
 498                 y2 = area->dy + area->height - 1;
 499
 500                 for (rows = area->height; rows--;) {
 501                         src = rowaddr(info, y1) + (area->sx >> 3);
 502                         dest = rowaddr(info, y2) + (area->dx >> 3);
 503                         //fb_memmove(dest, src, (area->width >> 3));
 504                         y1--;
 505                         y2--;
 506                 }
 507         }
 508 }
 509
 510 static void hgafb_imageblit(struct fb_info *info, const struct fb_image *image)
 511 {
 512         u8 __iomem *dest;
 513         u8 *cdat = (u8 *) image->data;
 514         u_int rows, y = image->dy;
 515         u8 d;
 516
 517         for (rows = image->height; rows--; y++) {
 518                 d = *cdat++;
 519                 dest = rowaddr(info, y) + (image->dx >> 3);
 520                 fb_writeb(d, dest);
 521         }
 522 }
 523 #else /* !CONFIG_FB_HGA_ACCEL */
 524 #define hgafb_fillrect cfb_fillrect
 525 #define hgafb_copyarea cfb_copyarea
 526 #define hgafb_imageblit cfb_imageblit
 527 #endif /* CONFIG_FB_HGA_ACCEL */
 528
 529
 530 static struct fb_ops hgafb_ops = {
 531         .owner          = THIS_MODULE,
 532         .fb_open        = hgafb_open,
 533         .fb_release     = hgafb_release,
 534         .fb_setcolreg   = hgafb_setcolreg,
 535         .fb_pan_display = hgafb_pan_display,
 536         .fb_blank       = hgafb_blank,
 537         .fb_fillrect    = hgafb_fillrect,
 538         .fb_copyarea    = hgafb_copyarea,
 539         .fb_imageblit   = hgafb_imageblit,
 540 };
 541
 542 /* ------------------------------------------------------------------------- *
 543  *
 544  * Functions in fb_info
 545  *
 546  * ------------------------------------------------------------------------- */
 547
 548 /* ------------------------------------------------------------------------- */
 549
 550         /*
 551          *  Initialization
 552          */
 553
 554 static int __devinit hgafb_probe(struct platform_device *pdev)
 555 {
 556         struct fb_info *info;
 557
 558         if (! hga_card_detect()) {
 559                 printk(KERN_INFO "hgafb: HGA card not detected.\n");
 560                 if (hga_vram)
 561                         iounmap(hga_vram);
 562                 return -EINVAL;
 563         }
 564
 565         printk(KERN_INFO "hgafb: %s with %ldK of memory detected.\n",
 566                 hga_type_name, hga_vram_len/1024);
 567
 568         info = framebuffer_alloc(0, &pdev->dev);
 569         if (!info) {
 570                 iounmap(hga_vram);
 571                 return -ENOMEM;
 572         }
 573
 574         hga_fix.smem_start = (unsigned long)hga_vram;
 575         hga_fix.smem_len = hga_vram_len;
 576
 577         info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 578         info->var = hga_default_var;
 579         info->fix = hga_fix;
 580         info->monspecs.hfmin = 0;
 581         info->monspecs.hfmax = 0;
 582         info->monspecs.vfmin = 10000;
 583         info->monspecs.vfmax = 10000;
 584         info->monspecs.dpms = 0;
 585         info->fbops = &hgafb_ops;
 586         info->screen_base = hga_vram;
 587
 588         if (register_framebuffer(info) < 0) {
 589                 framebuffer_release(info);
 590                 iounmap(hga_vram);
 591                 return -EINVAL;
 592         }
 593
 594         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 595                info->node, info->fix.id);
 596         platform_set_drvdata(pdev, info);
 597         return 0;
 598 }
 599
 600 static int hgafb_remove(struct platform_device *pdev)
 601 {
 602         struct fb_info *info = platform_get_drvdata(pdev);
 603
 604         hga_txt_mode();
 605         hga_clear_screen();
 606
 607         if (info) {
 608                 unregister_framebuffer(info);
 609                 framebuffer_release(info);
 610         }
 611
 612         iounmap(hga_vram);
 613
 614         if (release_io_ports)
 615                 release_region(0x3b0, 12);
 616
 617         if (release_io_port)
 618                 release_region(0x3bf, 1);
 619
 620         return 0;
 621 }
 622
 623 static struct platform_driver hgafb_driver = {
 624         .probe = hgafb_probe,
 625         .remove = hgafb_remove,
 626         .driver = {
 627                 .name = "hgafb",
 628         },
 629 };
 630
 631 static struct platform_device *hgafb_device;
 632
 633 static int __init hgafb_init(void)
 634 {
 635         int ret;
 636
 637         if (fb_get_options("hgafb", NULL))
 638                 return -ENODEV;
 639
 640         ret = platform_driver_register(&hgafb_driver);
 641
 642         if (!ret) {
 643                 hgafb_device = platform_device_register_simple("hgafb", 0, NULL, 0);
 644
 645                 if (IS_ERR(hgafb_device)) {
 646                         platform_driver_unregister(&hgafb_driver);
 647                         ret = PTR_ERR(hgafb_device);
 648                 }
 649         }
 650
 651         return ret;
 652 }
 653
 654 static void __exit hgafb_exit(void)
 655 {
 656         platform_device_unregister(hgafb_device);
 657         platform_driver_unregister(&hgafb_driver);
 658 }
 659
 660 /* -------------------------------------------------------------------------
 661  *
 662  *  Modularization
 663  *
 664  * ------------------------------------------------------------------------- */
 665
 666 MODULE_AUTHOR("Ferenc Bakonyi (fero@drama.obuda.kando.hu)");
 667 MODULE_DESCRIPTION("FBDev driver for Hercules Graphics Adaptor");
 668 MODULE_LICENSE("GPL");
 669
 670 module_param(nologo, bool, 0);
 671 MODULE_PARM_DESC(nologo, "Disables startup logo if != 0 (default=0)");
 672 module_init(hgafb_init);
 673 module_exit(hgafb_exit);