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