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