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