drivers/video/epson1355fb.c

   1 /*
   2  * linux/drivers/video/epson1355fb.c -- Epson S1D13505 frame buffer for 2.5.
   3  *
   4  * Epson Research S1D13505 Embedded RAMDAC LCD/CRT Controller
   5  *   (previously known as SED1355)
   6  *
   7  * Cf. http://www.erd.epson.com/vdc/html/S1D13505.html
   8  *
   9  *
  10  * Copyright (C) Hewlett-Packard Company.  All rights reserved.
  11  *
  12  * Written by Christopher Hoover <ch@hpl.hp.com>
  13  *
  14  * Adapted from:
  15  *
  16  *  linux/drivers/video/skeletonfb.c
  17  *  Modified to new api Jan 2001 by James Simmons (jsimmons@infradead.org)
  18  *  Created 28 Dec 1997 by Geert Uytterhoeven
  19  *
  20  *  linux/drivers/video/epson1355fb.c (2.4 driver)
  21  *  Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
  22  *
  23  * This file is subject to the terms and conditions of the GNU General Public
  24  * License. See the file COPYING in the main directory of this archive for
  25  * more details.
  26  *
  27  *
  28  * Noteworthy Issues
  29  * -----------------
  30  *
  31  * This driver is complicated by the fact that this is a 16-bit chip
  32  * and, on at least one platform (ceiva), we can only do 16-bit reads
  33  * and writes to the framebuffer.  We hide this from user space
  34  * except in the case of mmap().
  35  *
  36  *
  37  * To Do
  38  * -----
  39  *
  40  * - Test 8-bit pseudocolor mode
  41  * - Allow setting bpp, virtual resolution
  42  * - Implement horizontal panning
  43  * - (maybe) Implement hardware cursor
  44  */
  45
  46 #include <linux/module.h>
  47 #include <linux/kernel.h>
  48 #include <linux/errno.h>
  49 #include <linux/string.h>
  50 #include <linux/mm.h>
  51 #include <linux/slab.h>
  52 #include <linux/delay.h>
  53 #include <linux/fb.h>
  54 #include <linux/init.h>
  55 #include <linux/ioport.h>
  56 #include <linux/platform_device.h>
  57
  58 #include <asm/types.h>
  59 #include <asm/io.h>
  60 #include <linux/uaccess.h>
  61
  62 #include <video/epson1355.h>
  63
  64 struct epson1355_par {
  65         unsigned long reg_addr;
  66         u32 pseudo_palette[16];
  67 };
  68
  69 /* ------------------------------------------------------------------------- */
  70
  71 #if defined(CONFIG_ARM)
  72
  73 # ifdef CONFIG_ARCH_CEIVA
  74 #  include <mach/hardware.h>
  75 #  define EPSON1355FB_BASE_PHYS (CEIVA_PHYS_SED1355)
  76 # endif
  77
  78 static inline u8 epson1355_read_reg(struct epson1355_par *par, int index)
  79 {
  80         return __raw_readb(par->reg_addr + index);
  81 }
  82
  83 static inline void epson1355_write_reg(struct epson1355_par *par, u8 data, int index)
  84 {
  85         __raw_writeb(data, par->reg_addr + index);
  86 }
  87
  88 #else
  89 # error "no architecture-specific epson1355_{read,write}_reg"
  90 #endif
  91
  92 #ifndef EPSON1355FB_BASE_PHYS
  93 # error  "EPSON1355FB_BASE_PHYS is not defined"
  94 #endif
  95
  96 #define EPSON1355FB_REGS_OFS    (0)
  97 #define EPSON1355FB_REGS_PHYS   (EPSON1355FB_BASE_PHYS + EPSON1355FB_REGS_OFS)
  98 #define EPSON1355FB_REGS_LEN    (64)
  99
 100 #define EPSON1355FB_FB_OFS      (0x00200000)
 101 #define EPSON1355FB_FB_PHYS     (EPSON1355FB_BASE_PHYS + EPSON1355FB_FB_OFS)
 102 #define EPSON1355FB_FB_LEN      (2 * 1024 * 1024)
 103
 104 /* ------------------------------------------------------------------------- */
 105
 106 static inline u16 epson1355_read_reg16(struct epson1355_par *par, int index)
 107 {
 108         u8 lo = epson1355_read_reg(par, index);
 109         u8 hi = epson1355_read_reg(par, index + 1);
 110
 111         return (hi << 8) | lo;
 112 }
 113
 114 static inline void epson1355_write_reg16(struct epson1355_par *par, u16 data, int index)
 115 {
 116         u8 lo = data & 0xff;
 117         u8 hi = (data >> 8) & 0xff;
 118
 119         epson1355_write_reg(par, lo, index);
 120         epson1355_write_reg(par, hi, index + 1);
 121 }
 122
 123 static inline u32 epson1355_read_reg20(struct epson1355_par *par, int index)
 124 {
 125         u8 b0 = epson1355_read_reg(par, index);
 126         u8 b1 = epson1355_read_reg(par, index + 1);
 127         u8 b2 = epson1355_read_reg(par, index + 2);
 128
 129         return (b2 & 0x0f) << 16 | (b1 << 8) | b0;
 130 }
 131
 132 static inline void epson1355_write_reg20(struct epson1355_par *par, u32 data, int index)
 133 {
 134         u8 b0 = data & 0xff;
 135         u8 b1 = (data >> 8) & 0xff;
 136         u8 b2 = (data >> 16) & 0x0f;
 137
 138         epson1355_write_reg(par, b0, index);
 139         epson1355_write_reg(par, b1, index + 1);
 140         epson1355_write_reg(par, b2, index + 2);
 141 }
 142
 143 /* ------------------------------------------------------------------------- */
 144
 145 static void set_lut(struct epson1355_par *par, u8 index, u8 r, u8 g, u8 b)
 146 {
 147         epson1355_write_reg(par, index, REG_LUT_ADDR);
 148         epson1355_write_reg(par, r, REG_LUT_DATA);
 149         epson1355_write_reg(par, g, REG_LUT_DATA);
 150         epson1355_write_reg(par, b, REG_LUT_DATA);
 151 }
 152
 153
 154 /**
 155  *      epson1355fb_setcolreg - sets a color register.
 156  *      @regno: Which register in the CLUT we are programming
 157  *      @red: The red value which can be up to 16 bits wide
 158  *      @green: The green value which can be up to 16 bits wide
 159  *      @blue:  The blue value which can be up to 16 bits wide.
 160  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 161  *      @info: frame buffer info structure
 162  *
 163  *      Returns negative errno on error, or zero on success.
 164  */
 165 static int epson1355fb_setcolreg(unsigned regno, unsigned r, unsigned g,
 166                                  unsigned b, unsigned transp,
 167                                  struct fb_info *info)
 168 {
 169         struct epson1355_par *par = info->par;
 170
 171         if (info->var.grayscale)
 172                 r = g = b = (19595 * r + 38470 * g + 7471 * b) >> 16;
 173
 174         switch (info->fix.visual) {
 175         case FB_VISUAL_TRUECOLOR:
 176                 if (regno >= 16)
 177                         return -EINVAL;
 178
 179                 ((u32 *) info->pseudo_palette)[regno] =
 180                     (r & 0xf800) | (g & 0xfc00) >> 5 | (b & 0xf800) >> 11;
 181
 182                 break;
 183         case FB_VISUAL_PSEUDOCOLOR:
 184                 if (regno >= 256)
 185                         return -EINVAL;
 186
 187                 set_lut(par, regno, r >> 8, g >> 8, b >> 8);
 188
 189                 break;
 190         default:
 191                 return -ENOSYS;
 192         }
 193         return 0;
 194 }
 195
 196 /* ------------------------------------------------------------------------- */
 197
 198 /**
 199  *      epson1355fb_pan_display - Pans the display.
 200  *      @var: frame buffer variable screen structure
 201  *      @info: frame buffer structure that represents a single frame buffer
 202  *
 203  *      Pan (or wrap, depending on the `vmode' field) the display using the
 204  *      `xoffset' and `yoffset' fields of the `var' structure.
 205  *      If the values don't fit, return -EINVAL.
 206  *
 207  *      Returns negative errno on error, or zero on success.
 208  */
 209 static int epson1355fb_pan_display(struct fb_var_screeninfo *var,
 210                                    struct fb_info *info)
 211 {
 212         struct epson1355_par *par = info->par;
 213         u32 start;
 214
 215         if (var->xoffset != 0)  /* not yet ... */
 216                 return -EINVAL;
 217
 218         if (var->yoffset + info->var.yres > info->var.yres_virtual)
 219                 return -EINVAL;
 220
 221         start = (info->fix.line_length >> 1) * var->yoffset;
 222
 223         epson1355_write_reg20(par, start, REG_SCRN1_DISP_START_ADDR0);
 224
 225         return 0;
 226 }
 227
 228 /* ------------------------------------------------------------------------- */
 229
 230 static void lcd_enable(struct epson1355_par *par, int enable)
 231 {
 232         u8 mode = epson1355_read_reg(par, REG_DISPLAY_MODE);
 233
 234         if (enable)
 235                 mode |= 1;
 236         else
 237                 mode &= ~1;
 238
 239         epson1355_write_reg(par, mode, REG_DISPLAY_MODE);
 240 }
 241
 242 #if defined(CONFIG_ARCH_CEIVA)
 243 static void backlight_enable(int enable)
 244 {
 245         /* ### this should be protected by a spinlock ... */
 246         u8 pddr = clps_readb(PDDR);
 247         if (enable)
 248                 pddr |= (1 << 5);
 249         else
 250                 pddr &= ~(1 << 5);
 251         clps_writeb(pddr, PDDR);
 252 }
 253 #else
 254 static void backlight_enable(int enable)
 255 {
 256 }
 257 #endif
 258
 259
 260 /**
 261  *      epson1355fb_blank - blanks the display.
 262  *      @blank_mode: the blank mode we want.
 263  *      @info: frame buffer structure that represents a single frame buffer
 264  *
 265  *      Blank the screen if blank_mode != 0, else unblank. Return 0 if
 266  *      blanking succeeded, != 0 if un-/blanking failed due to e.g. a
 267  *      video mode which doesn't support it. Implements VESA suspend
 268  *      and powerdown modes on hardware that supports disabling hsync/vsync:
 269  *      blank_mode == 2: suspend vsync
 270  *      blank_mode == 3: suspend hsync
 271  *      blank_mode == 4: powerdown
 272  *
 273  *      Returns negative errno on error, or zero on success.
 274  *
 275  */
 276 static int epson1355fb_blank(int blank_mode, struct fb_info *info)
 277 {
 278         struct epson1355_par *par = info->par;
 279
 280         switch (blank_mode) {
 281         case FB_BLANK_UNBLANK:
 282         case FB_BLANK_NORMAL:
 283                 lcd_enable(par, 1);
 284                 backlight_enable(1);
 285                 break;
 286         case FB_BLANK_VSYNC_SUSPEND:
 287         case FB_BLANK_HSYNC_SUSPEND:
 288                 backlight_enable(0);
 289                 break;
 290         case FB_BLANK_POWERDOWN:
 291                 backlight_enable(0);
 292                 lcd_enable(par, 0);
 293                 break;
 294         default:
 295                 return -EINVAL;
 296         }
 297
 298         /* let fbcon do a soft blank for us */
 299         return (blank_mode == FB_BLANK_NORMAL) ? 1 : 0;
 300 }
 301
 302 /* ------------------------------------------------------------------------- */
 303
 304 /*
 305  * We can't use the cfb generic routines, as we have to limit
 306  * ourselves to 16-bit or 8-bit loads and stores to this 16-bit
 307  * chip.
 308  */
 309
 310 static inline void epson1355fb_fb_writel(unsigned long v, unsigned long *a)
 311 {
 312         u16 *p = (u16 *) a;
 313         u16 l = v & 0xffff;
 314         u16 h = v >> 16;
 315
 316         fb_writew(l, p);
 317         fb_writew(h, p + 1);
 318 }
 319
 320 static inline unsigned long epson1355fb_fb_readl(const unsigned long *a)
 321 {
 322         const u16 *p = (u16 *) a;
 323         u16 l = fb_readw(p);
 324         u16 h = fb_readw(p + 1);
 325
 326         return (h << 16) | l;
 327 }
 328
 329 #define FB_READL epson1355fb_fb_readl
 330 #define FB_WRITEL epson1355fb_fb_writel
 331
 332 /* ------------------------------------------------------------------------- */
 333
 334 static inline unsigned long copy_from_user16(void *to, const void *from,
 335                                              unsigned long n)
 336 {
 337         u16 *dst = (u16 *) to;
 338         u16 *src = (u16 *) from;
 339
 340         if (!access_ok(VERIFY_READ, from, n))
 341                 return n;
 342
 343         while (n > 1) {
 344                 u16 v;
 345                 if (__get_user(v, src))
 346                         return n;
 347
 348                 fb_writew(v, dst);
 349
 350                 src++, dst++;
 351                 n -= 2;
 352         }
 353
 354         if (n) {
 355                 u8 v;
 356
 357                 if (__get_user(v, ((u8 *) src)))
 358                         return n;
 359
 360                 fb_writeb(v, dst);
 361         }
 362         return 0;
 363 }
 364
 365 static inline unsigned long copy_to_user16(void *to, const void *from,
 366                                            unsigned long n)
 367 {
 368         u16 *dst = (u16 *) to;
 369         u16 *src = (u16 *) from;
 370
 371         if (!access_ok(VERIFY_WRITE, to, n))
 372                 return n;
 373
 374         while (n > 1) {
 375                 u16 v = fb_readw(src);
 376
 377                 if (__put_user(v, dst))
 378                         return n;
 379
 380                 src++, dst++;
 381                 n -= 2;
 382         }
 383
 384         if (n) {
 385                 u8 v = fb_readb(src);
 386
 387                 if (__put_user(v, ((u8 *) dst)))
 388                         return n;
 389         }
 390         return 0;
 391 }
 392
 393
 394 static ssize_t
 395 epson1355fb_read(struct fb_info *info, char *buf, size_t count, loff_t * ppos)
 396 {
 397         unsigned long p = *ppos;
 398
 399         if (p >= info->fix.smem_len)
 400                 return 0;
 401         if (count >= info->fix.smem_len)
 402                 count = info->fix.smem_len;
 403         if (count + p > info->fix.smem_len)
 404                 count = info->fix.smem_len - p;
 405
 406         if (count) {
 407                 char *base_addr;
 408
 409                 base_addr = info->screen_base;
 410                 count -= copy_to_user16(buf, base_addr + p, count);
 411                 if (!count)
 412                         return -EFAULT;
 413                 *ppos += count;
 414         }
 415         return count;
 416 }
 417
 418 static ssize_t
 419 epson1355fb_write(struct fb_info *info, const char *buf,
 420                   size_t count, loff_t * ppos)
 421 {
 422         unsigned long p = *ppos;
 423         int err;
 424
 425         /* from fbmem.c except for our own copy_*_user */
 426         if (p > info->fix.smem_len)
 427                 return -ENOSPC;
 428         if (count >= info->fix.smem_len)
 429                 count = info->fix.smem_len;
 430         err = 0;
 431         if (count + p > info->fix.smem_len) {
 432                 count = info->fix.smem_len - p;
 433                 err = -ENOSPC;
 434         }
 435
 436         if (count) {
 437                 char *base_addr;
 438
 439                 base_addr = info->screen_base;
 440                 count -= copy_from_user16(base_addr + p, buf, count);
 441                 *ppos += count;
 442                 err = -EFAULT;
 443         }
 444         if (count)
 445                 return count;
 446         return err;
 447 }
 448
 449 /* ------------------------------------------------------------------------- */
 450
 451 static struct fb_ops epson1355fb_fbops = {
 452         .owner          = THIS_MODULE,
 453         .fb_setcolreg   = epson1355fb_setcolreg,
 454         .fb_pan_display = epson1355fb_pan_display,
 455         .fb_blank       = epson1355fb_blank,
 456         .fb_fillrect    = cfb_fillrect,
 457         .fb_copyarea    = cfb_copyarea,
 458         .fb_imageblit   = cfb_imageblit,
 459         .fb_read        = epson1355fb_read,
 460         .fb_write       = epson1355fb_write,
 461 };
 462
 463 /* ------------------------------------------------------------------------- */
 464
 465 static __init unsigned int get_fb_size(struct fb_info *info)
 466 {
 467         unsigned int size = 2 * 1024 * 1024;
 468         char *p = info->screen_base;
 469
 470         /* the 512k framebuffer is aliased at start + 0x80000 * n */
 471         fb_writeb(1, p);
 472         fb_writeb(0, p + 0x80000);
 473         if (!fb_readb(p))
 474                 size = 512 * 1024;
 475
 476         fb_writeb(0, p);
 477
 478         return size;
 479 }
 480
 481 static int epson1355_width_tab[2][4] __initdata =
 482     { {4, 8, 16, -1}, {9, 12, 16, -1} };
 483 static int epson1355_bpp_tab[8] __initdata = { 1, 2, 4, 8, 15, 16 };
 484
 485 static void __init fetch_hw_state(struct fb_info *info, struct epson1355_par *par)
 486 {
 487         struct fb_var_screeninfo *var = &info->var;
 488         struct fb_fix_screeninfo *fix = &info->fix;
 489         u8 panel, display;
 490         u16 offset;
 491         u32 xres, yres;
 492         u32 xres_virtual, yres_virtual;
 493         int bpp, lcd_bpp;
 494         int is_color, is_dual, is_tft;
 495         int lcd_enabled, crt_enabled;
 496
 497         fix->type = FB_TYPE_PACKED_PIXELS;
 498
 499         display = epson1355_read_reg(par, REG_DISPLAY_MODE);
 500         bpp = epson1355_bpp_tab[(display >> 2) & 7];
 501
 502         switch (bpp) {
 503         case 8:
 504                 fix->visual = FB_VISUAL_PSEUDOCOLOR;
 505                 var->bits_per_pixel = 8;
 506                 var->red.offset = var->green.offset = var->blue.offset = 0;
 507                 var->red.length = var->green.length = var->blue.length = 8;
 508                 break;
 509         case 16:
 510                 /* 5-6-5 RGB */
 511                 fix->visual = FB_VISUAL_TRUECOLOR;
 512                 var->bits_per_pixel = 16;
 513                 var->red.offset = 11;
 514                 var->red.length = 5;
 515                 var->green.offset = 5;
 516                 var->green.length = 6;
 517                 var->blue.offset = 0;
 518                 var->blue.length = 5;
 519                 break;
 520         default:
 521                 BUG();
 522         }
 523         fb_alloc_cmap(&(info->cmap), 256, 0);
 524
 525         panel = epson1355_read_reg(par, REG_PANEL_TYPE);
 526         is_color = (panel & 0x04) != 0;
 527         is_dual = (panel & 0x02) != 0;
 528         is_tft = (panel & 0x01) != 0;
 529         crt_enabled = (display & 0x02) != 0;
 530         lcd_enabled = (display & 0x01) != 0;
 531         lcd_bpp = epson1355_width_tab[is_tft][(panel >> 4) & 3];
 532
 533         xres = (epson1355_read_reg(par, REG_HORZ_DISP_WIDTH) + 1) * 8;
 534         yres = (epson1355_read_reg16(par, REG_VERT_DISP_HEIGHT0) + 1) *
 535             ((is_dual && !crt_enabled) ? 2 : 1);
 536         offset = epson1355_read_reg16(par, REG_MEM_ADDR_OFFSET0) & 0x7ff;
 537         xres_virtual = offset * 16 / bpp;
 538         yres_virtual = fix->smem_len / (offset * 2);
 539
 540         var->xres = xres;
 541         var->yres = yres;
 542         var->xres_virtual = xres_virtual;
 543         var->yres_virtual = yres_virtual;
 544         var->xoffset = var->yoffset = 0;
 545
 546         fix->line_length = offset * 2;
 547
 548         fix->xpanstep = 0;      /* no pan yet */
 549         fix->ypanstep = 1;
 550         fix->ywrapstep = 0;
 551         fix->accel = FB_ACCEL_NONE;
 552
 553         var->grayscale = !is_color;
 554
 555 #ifdef DEBUG
 556         printk(KERN_INFO
 557                "epson1355fb: xres=%d, yres=%d, "
 558                "is_color=%d, is_dual=%d, is_tft=%d\n",
 559                xres, yres, is_color, is_dual, is_tft);
 560         printk(KERN_INFO
 561                "epson1355fb: bpp=%d, lcd_bpp=%d, "
 562                "crt_enabled=%d, lcd_enabled=%d\n",
 563                bpp, lcd_bpp, crt_enabled, lcd_enabled);
 564 #endif
 565 }
 566
 567
 568 static void clearfb16(struct fb_info *info)
 569 {
 570         u16 *dst = (u16 *) info->screen_base;
 571         unsigned long n = info->fix.smem_len;
 572
 573         while (n > 1) {
 574                 fb_writew(0, dst);
 575                 dst++, n -= 2;
 576         }
 577
 578         if (n)
 579                 fb_writeb(0, dst);
 580 }
 581
 582 static int epson1355fb_remove(struct platform_device *dev)
 583 {
 584         struct fb_info *info = platform_get_drvdata(dev);
 585         struct epson1355_par *par = info->par;
 586
 587         backlight_enable(0);
 588         if (par) {
 589                 lcd_enable(par, 0);
 590                 if (par && par->reg_addr)
 591                         iounmap((void *) par->reg_addr);
 592         }
 593
 594         if (info) {
 595                 fb_dealloc_cmap(&info->cmap);
 596                 if (info->screen_base)
 597                         iounmap(info->screen_base);
 598                 framebuffer_release(info);
 599         }
 600         release_mem_region(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN);
 601         release_mem_region(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN);
 602         return 0;
 603 }
 604
 605 int __init epson1355fb_probe(struct platform_device *dev)
 606 {
 607         struct epson1355_par *default_par;
 608         struct fb_info *info;
 609         u8 revision;
 610         int rc = 0;
 611
 612         if (!request_mem_region(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN, "S1D13505 registers")) {
 613                 printk(KERN_ERR "epson1355fb: unable to reserve "
 614                        "registers at 0x%0x\n", EPSON1355FB_REGS_PHYS);
 615                 rc = -EBUSY;
 616                 goto bail;
 617         }
 618
 619         if (!request_mem_region(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN,
 620                                 "S1D13505 framebuffer")) {
 621                 printk(KERN_ERR "epson1355fb: unable to reserve "
 622                        "framebuffer at 0x%0x\n", EPSON1355FB_FB_PHYS);
 623                 rc = -EBUSY;
 624                 goto bail;
 625         }
 626
 627         info = framebuffer_alloc(sizeof(struct epson1355_par), &dev->dev);
 628         if (!info) {
 629                 rc = -ENOMEM;
 630                 goto bail;
 631         }
 632
 633         default_par = info->par;
 634         default_par->reg_addr = (unsigned long) ioremap(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN);
 635         if (!default_par->reg_addr) {
 636                 printk(KERN_ERR "epson1355fb: unable to map registers\n");
 637                 rc = -ENOMEM;
 638                 goto bail;
 639         }
 640         info->pseudo_palette = default_par->pseudo_palette;
 641
 642         info->screen_base = ioremap(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN);
 643         if (!info->screen_base) {
 644                 printk(KERN_ERR "epson1355fb: unable to map framebuffer\n");
 645                 rc = -ENOMEM;
 646                 goto bail;
 647         }
 648
 649         revision = epson1355_read_reg(default_par, REG_REVISION_CODE);
 650         if ((revision >> 2) != 3) {
 651                 printk(KERN_INFO "epson1355fb: epson1355 not found\n");
 652                 rc = -ENODEV;
 653                 goto bail;
 654         }
 655
 656         info->fix.mmio_start = EPSON1355FB_REGS_PHYS;
 657         info->fix.mmio_len = EPSON1355FB_REGS_LEN;
 658         info->fix.smem_start = EPSON1355FB_FB_PHYS;
 659         info->fix.smem_len = get_fb_size(info);
 660
 661         printk(KERN_INFO "epson1355fb: regs mapped at 0x%lx, fb %d KiB mapped at 0x%p\n",
 662                default_par->reg_addr, info->fix.smem_len / 1024, info->screen_base);
 663
 664         strcpy(info->fix.id, "S1D13505");
 665         info->par = default_par;
 666         info->fbops = &epson1355fb_fbops;
 667         info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 668
 669         /* we expect the boot loader to have initialized the chip
 670            with appropriate parameters from which we can determinte
 671            the flavor of lcd panel attached */
 672         fetch_hw_state(info, default_par);
 673
 674         /* turn this puppy on ... */
 675         clearfb16(info);
 676         backlight_enable(1);
 677         lcd_enable(default_par, 1);
 678
 679         if (register_framebuffer(info) < 0) {
 680                 rc = -EINVAL;
 681                 goto bail;
 682         }
 683         /*
 684          * Our driver data.
 685          */
 686         platform_set_drvdata(dev, info);
 687
 688         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 689                info->node, info->fix.id);
 690
 691         return 0;
 692
 693       bail:
 694         epson1355fb_remove(dev);
 695         return rc;
 696 }
 697
 698 static struct platform_driver epson1355fb_driver = {
 699         .probe  = epson1355fb_probe,
 700         .remove = epson1355fb_remove,
 701         .driver = {
 702                 .name   = "epson1355fb",
 703         },
 704 };
 705
 706 static struct platform_device *epson1355fb_device;
 707
 708 int __init epson1355fb_init(void)
 709 {
 710         int ret = 0;
 711
 712         if (fb_get_options("epson1355fb", NULL))
 713                 return -ENODEV;
 714
 715         ret = platform_driver_register(&epson1355fb_driver);
 716
 717         if (!ret) {
 718                 epson1355fb_device = platform_device_alloc("epson1355fb", 0);
 719
 720                 if (epson1355fb_device)
 721                         ret = platform_device_add(epson1355fb_device);
 722                 else
 723                         ret = -ENOMEM;
 724
 725                 if (ret) {
 726                         platform_device_put(epson1355fb_device);
 727                         platform_driver_unregister(&epson1355fb_driver);
 728                 }
 729         }
 730
 731         return ret;
 732 }
 733
 734 module_init(epson1355fb_init);
 735
 736 #ifdef MODULE
 737 static void __exit epson1355fb_exit(void)
 738 {
 739         platform_device_unregister(epson1355fb_device);
 740         platform_driver_unregister(&epson1355fb_driver);
 741 }
 742
 743 /* ------------------------------------------------------------------------- */
 744
 745 module_exit(epson1355fb_exit);
 746 #endif
 747
 748 MODULE_AUTHOR("Christopher Hoover <ch@hpl.hp.com>");
 749 MODULE_DESCRIPTION("Framebuffer driver for Epson S1D13505");
 750 MODULE_LICENSE("GPL");