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/tty.h>
  52 #include <linux/slab.h>
  53 #include <linux/delay.h>
  54 #include <linux/fb.h>
  55 #include <linux/init.h>
  56 #include <linux/ioport.h>
  57 #include <asm/types.h>
  58 #include <asm/io.h>
  59 #include <asm/uaccess.h>
  60
  61 #include <video/epson1355.h>
  62
  63 struct epson1355_par {
  64         unsigned long reg_addr;
  65 };
  66
  67 /* ------------------------------------------------------------------------- */
  68
  69 #ifdef CONFIG_SUPERH
  70
  71 static inline u8 epson1355_read_reg(int index)
  72 {
  73         return ctrl_inb(par.reg_addr + index);
  74 }
  75
  76 static inline void epson1355_write_reg(u8 data, int index)
  77 {
  78         ctrl_outb(data, par.reg_addr + index);
  79 }
  80
  81 #elif defined(CONFIG_ARM)
  82
  83 # ifdef CONFIG_ARCH_CEIVA
  84 #  include <asm/arch/hardware.h>
  85 #  define EPSON1355FB_BASE_PHYS (CEIVA_PHYS_SED1355)
  86 # endif
  87
  88 static inline u8 epson1355_read_reg(struct epson1355_par *par, int index)
  89 {
  90         return __raw_readb(par->reg_addr + index);
  91 }
  92
  93 static inline void epson1355_write_reg(struct epson1355_par *par, u8 data, int index)
  94 {
  95         __raw_writeb(data, par->reg_addr + index);
  96 }
  97
  98 #else
  99 # error "no architecture-specific epson1355_{read,write}_reg"
 100 #endif
 101
 102 #ifndef EPSON1355FB_BASE_PHYS
 103 # error  "EPSON1355FB_BASE_PHYS is not defined"
 104 #endif
 105
 106 #define EPSON1355FB_REGS_OFS    (0)
 107 #define EPSON1355FB_REGS_PHYS   (EPSON1355FB_BASE_PHYS + EPSON1355FB_REGS_OFS)
 108 #define EPSON1355FB_REGS_LEN    (64)
 109
 110 #define EPSON1355FB_FB_OFS      (0x00200000)
 111 #define EPSON1355FB_FB_PHYS     (EPSON1355FB_BASE_PHYS + EPSON1355FB_FB_OFS)
 112 #define EPSON1355FB_FB_LEN      (2 * 1024 * 1024)
 113
 114 /* ------------------------------------------------------------------------- */
 115
 116 static inline u16 epson1355_read_reg16(struct epson1355_par *par, int index)
 117 {
 118         u8 lo = epson1355_read_reg(par, index);
 119         u8 hi = epson1355_read_reg(par, index + 1);
 120
 121         return (hi << 8) | lo;
 122 }
 123
 124 static inline void epson1355_write_reg16(struct epson1355_par *par, u16 data, int index)
 125 {
 126         u8 lo = data & 0xff;
 127         u8 hi = (data >> 8) & 0xff;
 128
 129         epson1355_write_reg(par, lo, index);
 130         epson1355_write_reg(par, hi, index + 1);
 131 }
 132
 133 static inline u32 epson1355_read_reg20(struct epson1355_par *par, int index)
 134 {
 135         u8 b0 = epson1355_read_reg(par, index);
 136         u8 b1 = epson1355_read_reg(par, index + 1);
 137         u8 b2 = epson1355_read_reg(par, index + 2);
 138
 139         return (b2 & 0x0f) << 16 | (b1 << 8) | b0;
 140 }
 141
 142 static inline void epson1355_write_reg20(struct epson1355_par *par, u32 data, int index)
 143 {
 144         u8 b0 = data & 0xff;
 145         u8 b1 = (data >> 8) & 0xff;
 146         u8 b2 = (data >> 16) & 0x0f;
 147
 148         epson1355_write_reg(par, b0, index);
 149         epson1355_write_reg(par, b1, index + 1);
 150         epson1355_write_reg(par, b2, index + 2);
 151 }
 152
 153 /* ------------------------------------------------------------------------- */
 154
 155 static void set_lut(struct epson1355_par *par, u8 index, u8 r, u8 g, u8 b)
 156 {
 157         epson1355_write_reg(par, index, REG_LUT_ADDR);
 158         epson1355_write_reg(par, r, REG_LUT_DATA);
 159         epson1355_write_reg(par, g, REG_LUT_DATA);
 160         epson1355_write_reg(par, b, REG_LUT_DATA);
 161 }
 162
 163
 164 /**
 165  *      epson1355fb_setcolreg - sets a color register.
 166  *      @regno: Which register in the CLUT we are programming
 167  *      @red: The red value which can be up to 16 bits wide
 168  *      @green: The green value which can be up to 16 bits wide
 169  *      @blue:  The blue value which can be up to 16 bits wide.
 170  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 171  *      @info: frame buffer info structure
 172  *
 173  *      Returns negative errno on error, or zero on success.
 174  */
 175 static int epson1355fb_setcolreg(unsigned regno, unsigned r, unsigned g,
 176                                  unsigned b, unsigned transp,
 177                                  struct fb_info *info)
 178 {
 179         struct epson1355_par *par = info->par;
 180
 181         if (info->var.grayscale)
 182                 r = g = b = (19595 * r + 38470 * g + 7471 * b) >> 16;
 183
 184         switch (info->fix.visual) {
 185         case FB_VISUAL_TRUECOLOR:
 186                 if (regno >= 16)
 187                         return -EINVAL;
 188
 189                 ((u32 *) info->pseudo_palette)[regno] =
 190                     (r & 0xf800) | (g & 0xfc00) >> 5 | (b & 0xf800) >> 11;
 191
 192                 break;
 193         case FB_VISUAL_PSEUDOCOLOR:
 194                 if (regno >= 256)
 195                         return -EINVAL;
 196
 197                 set_lut(par, regno, r >> 8, g >> 8, b >> 8);
 198
 199                 break;
 200         default:
 201                 return -ENOSYS;
 202         }
 203         return 0;
 204 }
 205
 206 /* ------------------------------------------------------------------------- */
 207
 208 /**
 209  *      epson1355fb_pan_display - Pans the display.
 210  *      @var: frame buffer variable screen structure
 211  *      @info: frame buffer structure that represents a single frame buffer
 212  *
 213  *      Pan (or wrap, depending on the `vmode' field) the display using the
 214  *      `xoffset' and `yoffset' fields of the `var' structure.
 215  *      If the values don't fit, return -EINVAL.
 216  *
 217  *      Returns negative errno on error, or zero on success.
 218  */
 219 static int epson1355fb_pan_display(struct fb_var_screeninfo *var,
 220                                    struct fb_info *info)
 221 {
 222         struct epson1355_par *par = info->par;
 223         u32 start;
 224
 225         if (var->xoffset != 0)  /* not yet ... */
 226                 return -EINVAL;
 227
 228         if (var->yoffset + info->var.yres > info->var.yres_virtual)
 229                 return -EINVAL;
 230
 231         start = (info->fix.line_length >> 1) * var->yoffset;
 232
 233         epson1355_write_reg20(par, start, REG_SCRN1_DISP_START_ADDR0);
 234
 235         return 0;
 236 }
 237
 238 /* ------------------------------------------------------------------------- */
 239
 240 static void lcd_enable(struct epson1355_par *par, int enable)
 241 {
 242         u8 mode = epson1355_read_reg(par, REG_DISPLAY_MODE);
 243
 244         if (enable)
 245                 mode |= 1;
 246         else
 247                 mode &= ~1;
 248
 249         epson1355_write_reg(par, mode, REG_DISPLAY_MODE);
 250 }
 251
 252 #if defined(CONFIG_ARCH_CEIVA)
 253 static void backlight_enable(int enable)
 254 {
 255         /* ### this should be protected by a spinlock ... */
 256         u8 pddr = clps_readb(PDDR);
 257         if (enable)
 258                 pddr |= (1 << 5);
 259         else
 260                 pddr &= ~(1 << 5);
 261         clps_writeb(pddr, PDDR);
 262 }
 263 #else
 264 static void backlight_enable(int enable)
 265 {
 266 }
 267 #endif
 268
 269
 270 /**
 271  *      epson1355fb_blank - blanks the display.
 272  *      @blank_mode: the blank mode we want.
 273  *      @info: frame buffer structure that represents a single frame buffer
 274  *
 275  *      Blank the screen if blank_mode != 0, else unblank. Return 0 if
 276  *      blanking succeeded, != 0 if un-/blanking failed due to e.g. a
 277  *      video mode which doesn't support it. Implements VESA suspend
 278  *      and powerdown modes on hardware that supports disabling hsync/vsync:
 279  *      blank_mode == 2: suspend vsync
 280  *      blank_mode == 3: suspend hsync
 281  *      blank_mode == 4: powerdown
 282  *
 283  *      Returns negative errno on error, or zero on success.
 284  *
 285  */
 286 static int epson1355fb_blank(int blank_mode, struct fb_info *info)
 287 {
 288         struct epson1355_par *par = info->par;
 289
 290         switch (blank_mode) {
 291         case FB_BLANK_UNBLANKING:
 292         case FB_BLANK_NORMAL:
 293                 lcd_enable(par, 1);
 294                 backlight_enable(1);
 295                 break;
 296         case FB_BLANK_VSYNC_SUSPEND:
 297         case FB_BLANK_HSYNC_SUSPEND:
 298                 backlight_enable(0);
 299                 break;
 300         case FB_BLANK_POWERDOWN:
 301                 backlight_enable(0);
 302                 lcd_enable(par, 0);
 303                 break;
 304         default:
 305                 return -EINVAL;
 306         }
 307
 308         /* let fbcon do a soft blank for us */
 309         return (blank_mode == FB_BLANK_NORMAL) ? 1 : 0;
 310 }
 311
 312 /* ------------------------------------------------------------------------- */
 313
 314 /*
 315  * We can't use the cfb generic routines, as we have to limit
 316  * ourselves to 16-bit or 8-bit loads and stores to this 16-bit
 317  * chip.
 318  */
 319
 320 static inline void epson1355fb_fb_writel(unsigned long v, unsigned long *a)
 321 {
 322         u16 *p = (u16 *) a;
 323         u16 l = v & 0xffff;
 324         u16 h = v >> 16;
 325
 326         fb_writew(l, p);
 327         fb_writew(h, p + 1);
 328 }
 329
 330 static inline unsigned long epson1355fb_fb_readl(const unsigned long *a)
 331 {
 332         const u16 *p = (u16 *) a;
 333         u16 l = fb_readw(p);
 334         u16 h = fb_readw(p + 1);
 335
 336         return (h << 16) | l;
 337 }
 338
 339 #define FB_READL epson1355fb_fb_readl
 340 #define FB_WRITEL epson1355fb_fb_writel
 341
 342 /* ------------------------------------------------------------------------- */
 343
 344 static inline unsigned long copy_from_user16(void *to, const void *from,
 345                                              unsigned long n)
 346 {
 347         u16 *dst = (u16 *) to;
 348         u16 *src = (u16 *) from;
 349
 350         if (!access_ok(VERIFY_READ, from, n))
 351                 return n;
 352
 353         while (n > 1) {
 354                 u16 v;
 355                 if (__get_user(v, src))
 356                         return n;
 357
 358                 fb_writew(v, dst);
 359
 360                 src++, dst++;
 361                 n -= 2;
 362         }
 363
 364         if (n) {
 365                 u8 v;
 366
 367                 if (__get_user(v, ((u8 *) src)))
 368                         return n;
 369
 370                 fb_writeb(v, dst);
 371         }
 372         return 0;
 373 }
 374
 375 static inline unsigned long copy_to_user16(void *to, const void *from,
 376                                            unsigned long n)
 377 {
 378         u16 *dst = (u16 *) to;
 379         u16 *src = (u16 *) from;
 380
 381         if (!access_ok(VERIFY_WRITE, to, n))
 382                 return n;
 383
 384         while (n > 1) {
 385                 u16 v = fb_readw(src);
 386
 387                 if (__put_user(v, dst))
 388                         return n;
 389
 390                 src++, dst++;
 391                 n -= 2;
 392         }
 393
 394         if (n) {
 395                 u8 v = fb_readb(src);
 396
 397                 if (__put_user(v, ((u8 *) dst)))
 398                         return n;
 399         }
 400         return 0;
 401 }
 402
 403
 404 static ssize_t
 405 epson1355fb_read(struct file *file, char *buf, size_t count, loff_t * ppos)
 406 {
 407         struct inode *inode = file->f_dentry->d_inode;
 408         int fbidx = iminor(inode);
 409         struct fb_info *info = registered_fb[fbidx];
 410         unsigned long p = *ppos;
 411
 412         /* from fbmem.c except for our own copy_*_user */
 413         if (!info || !info->screen_base)
 414                 return -ENODEV;
 415
 416         if (p >= info->fix.smem_len)
 417                 return 0;
 418         if (count >= info->fix.smem_len)
 419                 count = info->fix.smem_len;
 420         if (count + p > info->fix.smem_len)
 421                 count = info->fix.smem_len - p;
 422
 423         if (count) {
 424                 char *base_addr;
 425
 426                 base_addr = info->screen_base;
 427                 count -= copy_to_user16(buf, base_addr + p, count);
 428                 if (!count)
 429                         return -EFAULT;
 430                 *ppos += count;
 431         }
 432         return count;
 433 }
 434
 435 static ssize_t
 436 epson1355fb_write(struct file *file, const char *buf,
 437                   size_t count, loff_t * ppos)
 438 {
 439         struct inode *inode = file->f_dentry->d_inode;
 440         int fbidx = iminor(inode);
 441         struct fb_info *info = registered_fb[fbidx];
 442         unsigned long p = *ppos;
 443         int err;
 444
 445         /* from fbmem.c except for our own copy_*_user */
 446         if (!info || !info->screen_base)
 447                 return -ENODEV;
 448
 449         /* from fbmem.c except for our own copy_*_user */
 450         if (p > info->fix.smem_len)
 451                 return -ENOSPC;
 452         if (count >= info->fix.smem_len)
 453                 count = info->fix.smem_len;
 454         err = 0;
 455         if (count + p > info->fix.smem_len) {
 456                 count = info->fix.smem_len - p;
 457                 err = -ENOSPC;
 458         }
 459
 460         if (count) {
 461                 char *base_addr;
 462
 463                 base_addr = info->screen_base;
 464                 count -= copy_from_user16(base_addr + p, buf, count);
 465                 *ppos += count;
 466                 err = -EFAULT;
 467         }
 468         if (count)
 469                 return count;
 470         return err;
 471 }
 472
 473 /* ------------------------------------------------------------------------- */
 474
 475 static struct fb_ops epson1355fb_fbops = {
 476         .owner          = THIS_MODULE,
 477         .fb_setcolreg   = epson1355fb_setcolreg,
 478         .fb_pan_display = epson1355fb_pan_display,
 479         .fb_blank       = epson1355fb_blank,
 480         .fb_fillrect    = cfb_fillrect,
 481         .fb_copyarea    = cfb_copyarea,
 482         .fb_imageblit   = cfb_imageblit,
 483         .fb_read        = epson1355fb_read,
 484         .fb_write       = epson1355fb_write,
 485         .fb_cursor      = soft_cursor,
 486 };
 487
 488 /* ------------------------------------------------------------------------- */
 489
 490 static __init unsigned int get_fb_size(struct fb_info *info)
 491 {
 492         unsigned int size = 2 * 1024 * 1024;
 493         char *p = info->screen_base;
 494
 495         /* the 512k framebuffer is aliased at start + 0x80000 * n */
 496         fb_writeb(1, p);
 497         fb_writeb(0, p + 0x80000);
 498         if (!fb_readb(p))
 499                 size = 512 * 1024;
 500
 501         fb_writeb(0, p);
 502
 503         return size;
 504 }
 505
 506 static int epson1355_width_tab[2][4] __initdata =
 507     { {4, 8, 16, -1}, {9, 12, 16, -1} };
 508 static int epson1355_bpp_tab[8] __initdata = { 1, 2, 4, 8, 15, 16 };
 509
 510 static void __init fetch_hw_state(struct fb_info *info, struct epson1355_par *par)
 511 {
 512         struct fb_var_screeninfo *var = &info->var;
 513         struct fb_fix_screeninfo *fix = &info->fix;
 514         u8 panel, display;
 515         u16 offset;
 516         u32 xres, yres;
 517         u32 xres_virtual, yres_virtual;
 518         int bpp, lcd_bpp;
 519         int is_color, is_dual, is_tft;
 520         int lcd_enabled, crt_enabled;
 521
 522         fix->type = FB_TYPE_PACKED_PIXELS;
 523
 524         display = epson1355_read_reg(par, REG_DISPLAY_MODE);
 525         bpp = epson1355_bpp_tab[(display >> 2) & 7];
 526
 527         switch (bpp) {
 528         case 8:
 529                 fix->visual = FB_VISUAL_PSEUDOCOLOR;
 530                 var->bits_per_pixel = 8;
 531                 var->red.offset = var->green.offset = var->blue.offset = 0;
 532                 var->red.length = var->green.length = var->blue.length = 8;
 533                 break;
 534         case 16:
 535                 /* 5-6-5 RGB */
 536                 fix->visual = FB_VISUAL_TRUECOLOR;
 537                 var->bits_per_pixel = 16;
 538                 var->red.offset = 11;
 539                 var->red.length = 5;
 540                 var->green.offset = 5;
 541                 var->green.length = 6;
 542                 var->blue.offset = 0;
 543                 var->blue.length = 5;
 544                 break;
 545         default:
 546                 BUG();
 547         }
 548         fb_alloc_cmap(&(info->cmap), 256, 0);
 549
 550         panel = epson1355_read_reg(par, REG_PANEL_TYPE);
 551         is_color = (panel & 0x04) != 0;
 552         is_dual = (panel & 0x02) != 0;
 553         is_tft = (panel & 0x01) != 0;
 554         crt_enabled = (display & 0x02) != 0;
 555         lcd_enabled = (display & 0x01) != 0;
 556         lcd_bpp = epson1355_width_tab[is_tft][(panel >> 4) & 3];
 557
 558         xres = (epson1355_read_reg(par, REG_HORZ_DISP_WIDTH) + 1) * 8;
 559         yres = (epson1355_read_reg16(par, REG_VERT_DISP_HEIGHT0) + 1) *
 560             ((is_dual && !crt_enabled) ? 2 : 1);
 561         offset = epson1355_read_reg16(par, REG_MEM_ADDR_OFFSET0) & 0x7ff;
 562         xres_virtual = offset * 16 / bpp;
 563         yres_virtual = fix->smem_len / (offset * 2);
 564
 565         var->xres = xres;
 566         var->yres = yres;
 567         var->xres_virtual = xres_virtual;
 568         var->yres_virtual = yres_virtual;
 569         var->xoffset = var->yoffset = 0;
 570
 571         fix->line_length = offset * 2;
 572
 573         fix->xpanstep = 0;      /* no pan yet */
 574         fix->ypanstep = 1;
 575         fix->ywrapstep = 0;
 576         fix->accel = FB_ACCEL_NONE;
 577
 578         var->grayscale = !is_color;
 579
 580 #ifdef DEBUG
 581         printk(KERN_INFO
 582                "epson1355fb: xres=%d, yres=%d, "
 583                "is_color=%d, is_dual=%d, is_tft=%d\n",
 584                xres, yres, is_color, is_dual, is_tft);
 585         printk(KERN_INFO
 586                "epson1355fb: bpp=%d, lcd_bpp=%d, "
 587                "crt_enabled=%d, lcd_enabled=%d\n",
 588                bpp, lcd_bpp, crt_enabled, lcd_enabled);
 589 #endif
 590 }
 591
 592
 593 static void clearfb16(struct fb_info *info)
 594 {
 595         u16 *dst = (u16 *) info->screen_base;
 596         unsigned long n = info->fix.smem_len;
 597
 598         while (n > 1) {
 599                 fb_writew(0, dst);
 600                 dst++, n -= 2;
 601         }
 602
 603         if (n)
 604                 fb_writeb(0, dst);
 605 }
 606
 607 static void epson1355fb_platform_release(struct device *device)
 608 {
 609 }
 610
 611 static int epson1355fb_remove(struct device *device)
 612 {
 613         struct fb_info *info = dev_get_drvdata(device);
 614         struct epson1355_par *par = info->par;
 615
 616         backlight_enable(0);
 617         if (par) {
 618                 lcd_enable(par, 0);
 619                 if (par && par->reg_addr)
 620                         iounmap((void *) par->reg_addr);
 621         }
 622
 623         if (info) {
 624                 fb_dealloc_cmap(&info->cmap);
 625                 if (info->screen_base)
 626                         iounmap(info->screen_base);
 627                 framebuffer_release(info);
 628         }
 629         release_mem_region(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN);
 630         release_mem_region(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN);
 631         return 0;
 632 }
 633
 634 int __init epson1355fb_probe(struct device *device)
 635 {
 636         struct platform_device *dev = to_platform_device(device);
 637         struct epson1355_par *default_par;
 638         struct fb_info *info;
 639         u8 revision;
 640         int rc = 0;
 641
 642         if (!request_mem_region(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN, "S1D13505 registers")) {
 643                 printk(KERN_ERR "epson1355fb: unable to reserve "
 644                        "registers at 0x%0x\n", EPSON1355FB_REGS_PHYS);
 645                 rc = -EBUSY;
 646                 goto bail;
 647         }
 648
 649         if (!request_mem_region(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN,
 650                                 "S1D13505 framebuffer")) {
 651                 printk(KERN_ERR "epson1355fb: unable to reserve "
 652                        "framebuffer at 0x%0x\n", EPSON1355FB_FB_PHYS);
 653                 rc = -EBUSY;
 654                 goto bail;
 655         }
 656
 657         info = framebuffer_alloc(sizeof(struct epson1355_par) + sizeof(u32) * 256, &dev->dev);
 658         if (!info)
 659                 rc = -ENOMEM;
 660                 goto bail;
 661
 662         default_par = info->par;
 663         default_par->reg_addr = (unsigned long) ioremap(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN);
 664         if (!default_par->reg_addr) {
 665                 printk(KERN_ERR "epson1355fb: unable to map registers\n");
 666                 rc = -ENOMEM;
 667                 goto bail;
 668         }
 669         info->pseudo_palette = (void *)(default_par + 1);
 670
 671         info->screen_base = ioremap(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN);
 672         if (!info->screen_base) {
 673                 printk(KERN_ERR "epson1355fb: unable to map framebuffer\n");
 674                 rc = -ENOMEM;
 675                 goto bail;
 676         }
 677
 678         revision = epson1355_read_reg(default_par, REG_REVISION_CODE);
 679         if ((revision >> 2) != 3) {
 680                 printk(KERN_INFO "epson1355fb: epson1355 not found\n");
 681                 rc = -ENODEV;
 682                 goto bail;
 683         }
 684
 685         info->fix.mmio_start = EPSON1355FB_REGS_PHYS;
 686         info->fix.mmio_len = EPSON1355FB_REGS_LEN;
 687         info->fix.smem_start = EPSON1355FB_FB_PHYS;
 688         info->fix.smem_len = get_fb_size(info);
 689
 690         printk(KERN_INFO "epson1355fb: regs mapped at 0x%lx, fb %d KiB mapped at 0x%p\n",
 691                default_par->reg_addr, info->fix.smem_len / 1024, info->screen_base);
 692
 693         strcpy(info->fix.id, "S1D13505");
 694         info->par = default_par;
 695         info->fbops = &epson1355fb_fbops;
 696         info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 697
 698         /* we expect the boot loader to have initialized the chip
 699            with appropriate parameters from which we can determinte
 700            the flavor of lcd panel attached */
 701         fetch_hw_state(info, default_par);
 702
 703         /* turn this puppy on ... */
 704         clearfb16(info);
 705         backlight_enable(1);
 706         lcd_enable(default_par, 1);
 707
 708         if (register_framebuffer(info) < 0) {
 709                 rc = -EINVAL;
 710                 goto bail;
 711         }
 712         /*
 713          * Our driver data.
 714          */
 715         dev_set_drvdata(&dev->dev, info);
 716
 717         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 718                info->node, info->fix.id);
 719
 720         return 0;
 721
 722       bail:
 723         epson1355fb_remove(device);
 724         return rc;
 725 }
 726
 727 static struct device_driver epson1355fb_driver = {
 728         .name   = "epson1355fb",
 729         .bus    = &platform_bus_type,
 730         .probe  = epson1355fb_probe,
 731         .remove = epson1355fb_remove,
 732 };
 733
 734 static struct platform_device epson1355fb_device = {
 735         .name   = "epson1355fb",
 736         .id     = 0,
 737         .dev    = {
 738                 .release = epson1355fb_platform_release,
 739         }
 740 };
 741
 742 int __init epson1355fb_init(void)
 743 {
 744         int ret = 0;
 745
 746         if (fb_get_options("epson1355fb", NULL))
 747                 return -ENODEV;
 748
 749         ret = driver_register(&epson1355fb_driver);
 750         if (!ret) {
 751                 ret = platform_device_register(&epson1355fb_device);
 752                 if (ret)
 753                         driver_unregister(&epson1355fb_driver);
 754         }
 755         return ret;
 756 }
 757
 758 module_init(epson1355fb_init);
 759
 760 #ifdef MODULE
 761 static void __exit epson1355fb_exit(void)
 762 {
 763         platform_device_unregister(&epson1355fb_device);
 764         driver_unregister(&epson1355fb_driver);
 765 }
 766
 767 /* ------------------------------------------------------------------------- */
 768
 769 module_exit(epson1355fb_exit);
 770 #endif
 771
 772 MODULE_AUTHOR("Christopher Hoover <ch@hpl.hp.com>");
 773 MODULE_DESCRIPTION("Framebuffer driver for Epson S1D13505");
 774 MODULE_LICENSE("GPL");