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fbmem.c

/*
 *  linux/drivers/video/fbmem.c
 *
 *  Copyright (C) 1994 Martin Schaller
 *
 *    2001 - Documented with DocBook
 *    - Brad Douglas <brad@neruo.com>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/module.h>

#include <linux/compat.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/smp_lock.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/vt.h>
#include <linux/init.h>
#include <linux/linux_logo.h>
#include <linux/proc_fs.h>
#include <linux/console.h>
#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif
#include <linux/err.h>
#include <linux/device.h>
#include <linux/efi.h>
#include <linux/fb.h>

#include <asm/fb.h>


    /*
     *  Frame buffer device initialization and setup routines
     */

#define FBPIXMAPSIZE    (1024 * 8)

struct fb_info *registered_fb[FB_MAX] __read_mostly;
int num_registered_fb __read_mostly;

/*
 * Helpers
 */

int fb_get_color_depth(struct fb_var_screeninfo *var,
                   struct fb_fix_screeninfo *fix)
{
      int depth = 0;

      if (fix->visual == FB_VISUAL_MONO01 ||
          fix->visual == FB_VISUAL_MONO10)
            depth = 1;
      else {
            if (var->green.length == var->blue.length &&
                var->green.length == var->red.length &&
                var->green.offset == var->blue.offset &&
                var->green.offset == var->red.offset)
                  depth = var->green.length;
            else
                  depth = var->green.length + var->red.length +
                        var->blue.length;
      }

      return depth;
}
EXPORT_SYMBOL(fb_get_color_depth);

/*
 * Data padding functions.
 */
void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height)
{
      __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height);
}
EXPORT_SYMBOL(fb_pad_aligned_buffer);

void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height,
                        u32 shift_high, u32 shift_low, u32 mod)
{
      u8 mask = (u8) (0xfff << shift_high), tmp;
      int i, j;

      for (i = height; i--; ) {
            for (j = 0; j < idx; j++) {
                  tmp = dst[j];
                  tmp &= mask;
                  tmp |= *src >> shift_low;
                  dst[j] = tmp;
                  tmp = *src << shift_high;
                  dst[j+1] = tmp;
                  src++;
            }
            tmp = dst[idx];
            tmp &= mask;
            tmp |= *src >> shift_low;
            dst[idx] = tmp;
            if (shift_high < mod) {
                  tmp = *src << shift_high;
                  dst[idx+1] = tmp;
            }
            src++;
            dst += d_pitch;
      }
}
EXPORT_SYMBOL(fb_pad_unaligned_buffer);

/*
 * we need to lock this section since fb_cursor
 * may use fb_imageblit()
 */
char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size)
{
      u32 align = buf->buf_align - 1, offset;
      char *addr = buf->addr;

      /* If IO mapped, we need to sync before access, no sharing of
       * the pixmap is done
       */
      if (buf->flags & FB_PIXMAP_IO) {
            if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
                  info->fbops->fb_sync(info);
            return addr;
      }

      /* See if we fit in the remaining pixmap space */
      offset = buf->offset + align;
      offset &= ~align;
      if (offset + size > buf->size) {
            /* We do not fit. In order to be able to re-use the buffer,
             * we must ensure no asynchronous DMA'ing or whatever operation
             * is in progress, we sync for that.
             */
            if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC))
                  info->fbops->fb_sync(info);
            offset = 0;
      }
      buf->offset = offset + size;
      addr += offset;

      return addr;
}

#ifdef CONFIG_LOGO

static inline unsigned safe_shift(unsigned d, int n)
{
      return n < 0 ? d >> -n : d << n;
}

static void fb_set_logocmap(struct fb_info *info,
                           const struct linux_logo *logo)
{
      struct fb_cmap palette_cmap;
      u16 palette_green[16];
      u16 palette_blue[16];
      u16 palette_red[16];
      int i, j, n;
      const unsigned char *clut = logo->clut;

      palette_cmap.start = 0;
      palette_cmap.len = 16;
      palette_cmap.red = palette_red;
      palette_cmap.green = palette_green;
      palette_cmap.blue = palette_blue;
      palette_cmap.transp = NULL;

      for (i = 0; i < logo->clutsize; i += n) {
            n = logo->clutsize - i;
            /* palette_cmap provides space for only 16 colors at once */
            if (n > 16)
                  n = 16;
            palette_cmap.start = 32 + i;
            palette_cmap.len = n;
            for (j = 0; j < n; ++j) {
                  palette_cmap.red[j] = clut[0] << 8 | clut[0];
                  palette_cmap.green[j] = clut[1] << 8 | clut[1];
                  palette_cmap.blue[j] = clut[2] << 8 | clut[2];
                  clut += 3;
            }
            fb_set_cmap(&palette_cmap, info);
      }
}

static void  fb_set_logo_truepalette(struct fb_info *info,
                                  const struct linux_logo *logo,
                                  u32 *palette)
{
      static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
      unsigned char redmask, greenmask, bluemask;
      int redshift, greenshift, blueshift;
      int i;
      const unsigned char *clut = logo->clut;

      /*
       * We have to create a temporary palette since console palette is only
       * 16 colors long.
       */
      /* Bug: Doesn't obey msb_right ... (who needs that?) */
      redmask   = mask[info->var.red.length   < 8 ? info->var.red.length   : 8];
      greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8];
      bluemask  = mask[info->var.blue.length  < 8 ? info->var.blue.length  : 8];
      redshift   = info->var.red.offset   - (8 - info->var.red.length);
      greenshift = info->var.green.offset - (8 - info->var.green.length);
      blueshift  = info->var.blue.offset  - (8 - info->var.blue.length);

      for ( i = 0; i < logo->clutsize; i++) {
            palette[i+32] = (safe_shift((clut[0] & redmask), redshift) |
                         safe_shift((clut[1] & greenmask), greenshift) |
                         safe_shift((clut[2] & bluemask), blueshift));
            clut += 3;
      }
}

static void fb_set_logo_directpalette(struct fb_info *info,
                                   const struct linux_logo *logo,
                                   u32 *palette)
{
      int redshift, greenshift, blueshift;
      int i;

      redshift = info->var.red.offset;
      greenshift = info->var.green.offset;
      blueshift = info->var.blue.offset;

      for (i = 32; i < logo->clutsize; i++)
            palette[i] = i << redshift | i << greenshift | i << blueshift;
}

static void fb_set_logo(struct fb_info *info,
                         const struct linux_logo *logo, u8 *dst,
                         int depth)
{
      int i, j, k;
      const u8 *src = logo->data;
      u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
      u8 fg = 1, d;

      switch (fb_get_color_depth(&info->var, &info->fix)) {
      case 1:
            fg = 1;
            break;
      case 2:
            fg = 3;
            break;
      default:
            fg = 7;
            break;
      }

      if (info->fix.visual == FB_VISUAL_MONO01 ||
          info->fix.visual == FB_VISUAL_MONO10)
            fg = ~((u8) (0xfff << info->var.green.length));

      switch (depth) {
      case 4:
            for (i = 0; i < logo->height; i++)
                  for (j = 0; j < logo->width; src++) {
                        *dst++ = *src >> 4;
                        j++;
                        if (j < logo->width) {
                              *dst++ = *src & 0x0f;
                              j++;
                        }
                  }
            break;
      case 1:
            for (i = 0; i < logo->height; i++) {
                  for (j = 0; j < logo->width; src++) {
                        d = *src ^ xor;
                        for (k = 7; k >= 0; k--) {
                              *dst++ = ((d >> k) & 1) ? fg : 0;
                              j++;
                        }
                  }
            }
            break;
      }
}

/*
 * Three (3) kinds of logo maps exist.  linux_logo_clut224 (>16 colors),
 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors).  Depending on
 * the visual format and color depth of the framebuffer, the DAC, the
 * pseudo_palette, and the logo data will be adjusted accordingly.
 *
 * Case 1 - linux_logo_clut224:
 * Color exceeds the number of console colors (16), thus we set the hardware DAC
 * using fb_set_cmap() appropriately.  The "needs_cmapreset"  flag will be set.
 *
 * For visuals that require color info from the pseudo_palette, we also construct
 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags
 * will be set.
 *
 * Case 2 - linux_logo_vga16:
 * The number of colors just matches the console colors, thus there is no need
 * to set the DAC or the pseudo_palette.  However, the bitmap is packed, ie,
 * each byte contains color information for two pixels (upper and lower nibble).
 * To be consistent with fb_imageblit() usage, we therefore separate the two
 * nibbles into separate bytes. The "depth" flag will be set to 4.
 *
 * Case 3 - linux_logo_mono:
 * This is similar with Case 2.  Each byte contains information for 8 pixels.
 * We isolate each bit and expand each into a byte. The "depth" flag will
 * be set to 1.
 */
static struct logo_data {
      int depth;
      int needs_directpalette;
      int needs_truepalette;
      int needs_cmapreset;
      const struct linux_logo *logo;
} fb_logo __read_mostly;

static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height)
{
      u32 size = width * height, i;

      out += size - 1;

      for (i = size; i--; )
            *out-- = *in++;
}

static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height)
{
      int i, j, h = height - 1;

      for (i = 0; i < height; i++)
            for (j = 0; j < width; j++)
                        out[height * j + h - i] = *in++;
}

static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height)
{
      int i, j, w = width - 1;

      for (i = 0; i < height; i++)
            for (j = 0; j < width; j++)
                  out[height * (w - j) + i] = *in++;
}

static void fb_rotate_logo(struct fb_info *info, u8 *dst,
                     struct fb_image *image, int rotate)
{
      u32 tmp;

      if (rotate == FB_ROTATE_UD) {
            fb_rotate_logo_ud(image->data, dst, image->width,
                          image->height);
            image->dx = info->var.xres - image->width - image->dx;
            image->dy = info->var.yres - image->height - image->dy;
      } else if (rotate == FB_ROTATE_CW) {
            fb_rotate_logo_cw(image->data, dst, image->width,
                          image->height);
            tmp = image->width;
            image->width = image->height;
            image->height = tmp;
            tmp = image->dy;
            image->dy = image->dx;
            image->dx = info->var.xres - image->width - tmp;
      } else if (rotate == FB_ROTATE_CCW) {
            fb_rotate_logo_ccw(image->data, dst, image->width,
                           image->height);
            tmp = image->width;
            image->width = image->height;
            image->height = tmp;
            tmp = image->dx;
            image->dx = image->dy;
            image->dy = info->var.yres - image->height - tmp;
      }

      image->data = dst;
}

static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
                      int rotate, unsigned int num)
{
      unsigned int x;

      if (rotate == FB_ROTATE_UR) {
            for (x = 0;
                 x < num && image->dx + image->width <= info->var.xres;
                 x++) {
                  info->fbops->fb_imageblit(info, image);
                  image->dx += image->width + 8;
            }
      } else if (rotate == FB_ROTATE_UD) {
            for (x = 0; x < num && image->dx >= 0; x++) {
                  info->fbops->fb_imageblit(info, image);
                  image->dx -= image->width + 8;
            }
      } else if (rotate == FB_ROTATE_CW) {
            for (x = 0;
                 x < num && image->dy + image->height <= info->var.yres;
                 x++) {
                  info->fbops->fb_imageblit(info, image);
                  image->dy += image->height + 8;
            }
      } else if (rotate == FB_ROTATE_CCW) {
            for (x = 0; x < num && image->dy >= 0; x++) {
                  info->fbops->fb_imageblit(info, image);
                  image->dy -= image->height + 8;
            }
      }
}

static int fb_show_logo_line(struct fb_info *info, int rotate,
                       const struct linux_logo *logo, int y,
                       unsigned int n)
{
      u32 *palette = NULL, *saved_pseudo_palette = NULL;
      unsigned char *logo_new = NULL, *logo_rotate = NULL;
      struct fb_image image;

      /* Return if the frame buffer is not mapped or suspended */
      if (logo == NULL || info->state != FBINFO_STATE_RUNNING ||
          info->flags & FBINFO_MODULE)
            return 0;

      image.depth = 8;
      image.data = logo->data;

      if (fb_logo.needs_cmapreset)
            fb_set_logocmap(info, logo);

      if (fb_logo.needs_truepalette ||
          fb_logo.needs_directpalette) {
            palette = kmalloc(256 * 4, GFP_KERNEL);
            if (palette == NULL)
                  return 0;

            if (fb_logo.needs_truepalette)
                  fb_set_logo_truepalette(info, logo, palette);
            else
                  fb_set_logo_directpalette(info, logo, palette);

            saved_pseudo_palette = info->pseudo_palette;
            info->pseudo_palette = palette;
      }

      if (fb_logo.depth <= 4) {
            logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL);
            if (logo_new == NULL) {
                  kfree(palette);
                  if (saved_pseudo_palette)
                        info->pseudo_palette = saved_pseudo_palette;
                  return 0;
            }
            image.data = logo_new;
            fb_set_logo(info, logo, logo_new, fb_logo.depth);
      }

      image.dx = 0;
      image.dy = y;
      image.width = logo->width;
      image.height = logo->height;

      if (rotate) {
            logo_rotate = kmalloc(logo->width *
                              logo->height, GFP_KERNEL);
            if (logo_rotate)
                  fb_rotate_logo(info, logo_rotate, &image, rotate);
      }

      fb_do_show_logo(info, &image, rotate, n);

      kfree(palette);
      if (saved_pseudo_palette != NULL)
            info->pseudo_palette = saved_pseudo_palette;
      kfree(logo_new);
      kfree(logo_rotate);
      return logo->height;
}


#ifdef CONFIG_FB_LOGO_EXTRA

#define FB_LOGO_EX_NUM_MAX 10
static struct logo_data_extra {
      const struct linux_logo *logo;
      unsigned int n;
} fb_logo_ex[FB_LOGO_EX_NUM_MAX];
static unsigned int fb_logo_ex_num;

void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n)
{
      if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX)
            return;

      fb_logo_ex[fb_logo_ex_num].logo = logo;
      fb_logo_ex[fb_logo_ex_num].n = n;
      fb_logo_ex_num++;
}

static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height,
                          unsigned int yres)
{
      unsigned int i;

      /* FIXME: logo_ex supports only truecolor fb. */
      if (info->fix.visual != FB_VISUAL_TRUECOLOR)
            fb_logo_ex_num = 0;

      for (i = 0; i < fb_logo_ex_num; i++) {
            height += fb_logo_ex[i].logo->height;
            if (height > yres) {
                  height -= fb_logo_ex[i].logo->height;
                  fb_logo_ex_num = i;
                  break;
            }
      }
      return height;
}

static int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
{
      unsigned int i;

      for (i = 0; i < fb_logo_ex_num; i++)
            y += fb_show_logo_line(info, rotate,
                               fb_logo_ex[i].logo, y, fb_logo_ex[i].n);

      return y;
}

#else /* !CONFIG_FB_LOGO_EXTRA */

static inline int fb_prepare_extra_logos(struct fb_info *info,
                               unsigned int height,
                               unsigned int yres)
{
      return height;
}

static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate)
{
      return y;
}

#endif /* CONFIG_FB_LOGO_EXTRA */


int fb_prepare_logo(struct fb_info *info, int rotate)
{
      int depth = fb_get_color_depth(&info->var, &info->fix);
      unsigned int yres;

      memset(&fb_logo, 0, sizeof(struct logo_data));

      if (info->flags & FBINFO_MISC_TILEBLITTING ||
          info->flags & FBINFO_MODULE)
            return 0;

      if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
            depth = info->var.blue.length;
            if (info->var.red.length < depth)
                  depth = info->var.red.length;
            if (info->var.green.length < depth)
                  depth = info->var.green.length;
      }

      if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) {
            /* assume console colormap */
            depth = 4;
      }

      /* Return if no suitable logo was found */
      fb_logo.logo = fb_find_logo(depth);

      if (!fb_logo.logo) {
            return 0;
      }

      if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD)
            yres = info->var.yres;
      else
            yres = info->var.xres;

      if (fb_logo.logo->height > yres) {
            fb_logo.logo = NULL;
            return 0;
      }

      /* What depth we asked for might be different from what we get */
      if (fb_logo.logo->type == LINUX_LOGO_CLUT224)
            fb_logo.depth = 8;
      else if (fb_logo.logo->type == LINUX_LOGO_VGA16)
            fb_logo.depth = 4;
      else
            fb_logo.depth = 1;


      if (fb_logo.depth > 4 && depth > 4) {
            switch (info->fix.visual) {
            case FB_VISUAL_TRUECOLOR:
                  fb_logo.needs_truepalette = 1;
                  break;
            case FB_VISUAL_DIRECTCOLOR:
                  fb_logo.needs_directpalette = 1;
                  fb_logo.needs_cmapreset = 1;
                  break;
            case FB_VISUAL_PSEUDOCOLOR:
                  fb_logo.needs_cmapreset = 1;
                  break;
            }
      }

      return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
}

int fb_show_logo(struct fb_info *info, int rotate)
{
      int y;

      y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
                        num_online_cpus());
      y = fb_show_extra_logos(info, y, rotate);

      return y;
}
#else
int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
#endif /* CONFIG_LOGO */

static int fbmem_read_proc(char *buf, char **start, off_t offset,
                     int len, int *eof, void *private)
{
      struct fb_info **fi;
      int clen;

      clen = 0;
      for (fi = registered_fb; fi < &registered_fb[FB_MAX] && clen < 4000;
           fi++)
            if (*fi)
                  clen += sprintf(buf + clen, "%d %s\n",
                                (*fi)->node,
                                (*fi)->fix.id);
      *start = buf + offset;
      if (clen > offset)
            clen -= offset;
      else
            clen = 0;
      return clen < len ? clen : len;
}

static ssize_t
fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
      unsigned long p = *ppos;
      struct inode *inode = file->f_path.dentry->d_inode;
      int fbidx = iminor(inode);
      struct fb_info *info = registered_fb[fbidx];
      u32 *buffer, *dst;
      u32 __iomem *src;
      int c, i, cnt = 0, err = 0;
      unsigned long total_size;

      if (!info || ! info->screen_base)
            return -ENODEV;

      if (info->state != FBINFO_STATE_RUNNING)
            return -EPERM;

      if (info->fbops->fb_read)
            return info->fbops->fb_read(info, buf, count, ppos);
      
      total_size = info->screen_size;

      if (total_size == 0)
            total_size = info->fix.smem_len;

      if (p >= total_size)
            return 0;

      if (count >= total_size)
            count = total_size;

      if (count + p > total_size)
            count = total_size - p;

      buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
                   GFP_KERNEL);
      if (!buffer)
            return -ENOMEM;

      src = (u32 __iomem *) (info->screen_base + p);

      if (info->fbops->fb_sync)
            info->fbops->fb_sync(info);

      while (count) {
            c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
            dst = buffer;
            for (i = c >> 2; i--; )
                  *dst++ = fb_readl(src++);
            if (c & 3) {
                  u8 *dst8 = (u8 *) dst;
                  u8 __iomem *src8 = (u8 __iomem *) src;

                  for (i = c & 3; i--;)
                        *dst8++ = fb_readb(src8++);

                  src = (u32 __iomem *) src8;
            }

            if (copy_to_user(buf, buffer, c)) {
                  err = -EFAULT;
                  break;
            }
            *ppos += c;
            buf += c;
            cnt += c;
            count -= c;
      }

      kfree(buffer);

      return (err) ? err : cnt;
}

static ssize_t
fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
      unsigned long p = *ppos;
      struct inode *inode = file->f_path.dentry->d_inode;
      int fbidx = iminor(inode);
      struct fb_info *info = registered_fb[fbidx];
      u32 *buffer, *src;
      u32 __iomem *dst;
      int c, i, cnt = 0, err = 0;
      unsigned long total_size;

      if (!info || !info->screen_base)
            return -ENODEV;

      if (info->state != FBINFO_STATE_RUNNING)
            return -EPERM;

      if (info->fbops->fb_write)
            return info->fbops->fb_write(info, buf, count, ppos);
      
      total_size = info->screen_size;

      if (total_size == 0)
            total_size = info->fix.smem_len;

      if (p > total_size)
            return -EFBIG;

      if (count > total_size) {
            err = -EFBIG;
            count = total_size;
      }

      if (count + p > total_size) {
            if (!err)
                  err = -ENOSPC;

            count = total_size - p;
      }

      buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
                   GFP_KERNEL);
      if (!buffer)
            return -ENOMEM;

      dst = (u32 __iomem *) (info->screen_base + p);

      if (info->fbops->fb_sync)
            info->fbops->fb_sync(info);

      while (count) {
            c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
            src = buffer;

            if (copy_from_user(src, buf, c)) {
                  err = -EFAULT;
                  break;
            }

            for (i = c >> 2; i--; )
                  fb_writel(*src++, dst++);

            if (c & 3) {
                  u8 *src8 = (u8 *) src;
                  u8 __iomem *dst8 = (u8 __iomem *) dst;

                  for (i = c & 3; i--; )
                        fb_writeb(*src8++, dst8++);

                  dst = (u32 __iomem *) dst8;
            }

            *ppos += c;
            buf += c;
            cnt += c;
            count -= c;
      }

      kfree(buffer);

      return (cnt) ? cnt : err;
}

#ifdef CONFIG_KMOD
static void try_to_load(int fb)
{
      request_module("fb%d", fb);
}
#endif /* CONFIG_KMOD */

int
fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
{
      struct fb_fix_screeninfo *fix = &info->fix;
        int xoffset = var->xoffset;
        int yoffset = var->yoffset;
        int err = 0, yres = info->var.yres;

      if (var->yoffset > 0) {
            if (var->vmode & FB_VMODE_YWRAP) {
                  if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
                        err = -EINVAL;
                  else
                        yres = 0;
            } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
                  err = -EINVAL;
      }

      if (var->xoffset > 0 && (!fix->xpanstep ||
                         (var->xoffset % fix->xpanstep)))
            err = -EINVAL;

        if (err || !info->fbops->fb_pan_display || xoffset < 0 ||
          yoffset < 0 || var->yoffset + yres > info->var.yres_virtual ||
          var->xoffset + info->var.xres > info->var.xres_virtual)
            return -EINVAL;

      if ((err = info->fbops->fb_pan_display(var, info)))
            return err;
        info->var.xoffset = var->xoffset;
        info->var.yoffset = var->yoffset;
        if (var->vmode & FB_VMODE_YWRAP)
                info->var.vmode |= FB_VMODE_YWRAP;
        else
                info->var.vmode &= ~FB_VMODE_YWRAP;
        return 0;
}

static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var,
                   u32 activate)
{
      struct fb_event event;
      struct fb_blit_caps caps, fbcaps;
      int err = 0;

      memset(&caps, 0, sizeof(caps));
      memset(&fbcaps, 0, sizeof(fbcaps));
      caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0;
      event.info = info;
      event.data = &caps;
      fb_notifier_call_chain(FB_EVENT_GET_REQ, &event);
      info->fbops->fb_get_caps(info, &fbcaps, var);

      if (((fbcaps.x ^ caps.x) & caps.x) ||
          ((fbcaps.y ^ caps.y) & caps.y) ||
          (fbcaps.len < caps.len))
            err = -EINVAL;

      return err;
}

int
fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
{
      int flags = info->flags;
      int ret = 0;

      if (var->activate & FB_ACTIVATE_INV_MODE) {
            struct fb_videomode mode1, mode2;

            fb_var_to_videomode(&mode1, var);
            fb_var_to_videomode(&mode2, &info->var);
            /* make sure we don't delete the videomode of current var */
            ret = fb_mode_is_equal(&mode1, &mode2);

            if (!ret) {
                struct fb_event event;

                event.info = info;
                event.data = &mode1;
                ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
            }

            if (!ret)
                fb_delete_videomode(&mode1, &info->modelist);


            ret = (ret) ? -EINVAL : 0;
            goto done;
      }

      if ((var->activate & FB_ACTIVATE_FORCE) ||
          memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
            u32 activate = var->activate;

            if (!info->fbops->fb_check_var) {
                  *var = info->var;
                  goto done;
            }

            ret = info->fbops->fb_check_var(var, info);

            if (ret)
                  goto done;

            if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
                  struct fb_videomode mode;

                  if (info->fbops->fb_get_caps) {
                        ret = fb_check_caps(info, var, activate);

                        if (ret)
                              goto done;
                  }

                  info->var = *var;

                  if (info->fbops->fb_set_par)
                        info->fbops->fb_set_par(info);

                  fb_pan_display(info, &info->var);
                  fb_set_cmap(&info->cmap, info);
                  fb_var_to_videomode(&mode, &info->var);

                  if (info->modelist.prev && info->modelist.next &&
                      !list_empty(&info->modelist))
                        ret = fb_add_videomode(&mode, &info->modelist);

                  if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
                        struct fb_event event;
                        int evnt = (activate & FB_ACTIVATE_ALL) ?
                              FB_EVENT_MODE_CHANGE_ALL :
                              FB_EVENT_MODE_CHANGE;

                        info->flags &= ~FBINFO_MISC_USEREVENT;
                        event.info = info;
                        fb_notifier_call_chain(evnt, &event);
                  }
            }
      }

 done:
      return ret;
}

int
fb_blank(struct fb_info *info, int blank)
{     
      int ret = -EINVAL;

      if (blank > FB_BLANK_POWERDOWN)
            blank = FB_BLANK_POWERDOWN;

      if (info->fbops->fb_blank)
            ret = info->fbops->fb_blank(blank, info);

      if (!ret) {
            struct fb_event event;

            event.info = info;
            event.data = &blank;
            fb_notifier_call_chain(FB_EVENT_BLANK, &event);
      }

      return ret;
}

static int 
fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
       unsigned long arg)
{
      int fbidx = iminor(inode);
      struct fb_info *info = registered_fb[fbidx];
      struct fb_ops *fb = info->fbops;
      struct fb_var_screeninfo var;
      struct fb_fix_screeninfo fix;
      struct fb_con2fbmap con2fb;
      struct fb_cmap_user cmap;
      struct fb_event event;
      void __user *argp = (void __user *)arg;
      int i;
      
      if (!fb)
            return -ENODEV;
      switch (cmd) {
      case FBIOGET_VSCREENINFO:
            return copy_to_user(argp, &info->var,
                            sizeof(var)) ? -EFAULT : 0;
      case FBIOPUT_VSCREENINFO:
            if (copy_from_user(&var, argp, sizeof(var)))
                  return -EFAULT;
            acquire_console_sem();
            info->flags |= FBINFO_MISC_USEREVENT;
            i = fb_set_var(info, &var);
            info->flags &= ~FBINFO_MISC_USEREVENT;
            release_console_sem();
            if (i) return i;
            if (copy_to_user(argp, &var, sizeof(var)))
                  return -EFAULT;
            return 0;
      case FBIOGET_FSCREENINFO:
            return copy_to_user(argp, &info->fix,
                            sizeof(fix)) ? -EFAULT : 0;
      case FBIOPUTCMAP:
            if (copy_from_user(&cmap, argp, sizeof(cmap)))
                  return -EFAULT;
            return (fb_set_user_cmap(&cmap, info));
      case FBIOGETCMAP:
            if (copy_from_user(&cmap, argp, sizeof(cmap)))
                  return -EFAULT;
            return fb_cmap_to_user(&info->cmap, &cmap);
      case FBIOPAN_DISPLAY:
            if (copy_from_user(&var, argp, sizeof(var)))
                  return -EFAULT;
            acquire_console_sem();
            i = fb_pan_display(info, &var);
            release_console_sem();
            if (i)
                  return i;
            if (copy_to_user(argp, &var, sizeof(var)))
                  return -EFAULT;
            return 0;
      case FBIO_CURSOR:
            return -EINVAL;
      case FBIOGET_CON2FBMAP:
            if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
                  return -EFAULT;
            if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
                return -EINVAL;
            con2fb.framebuffer = -1;
            event.info = info;
            event.data = &con2fb;
            fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
            return copy_to_user(argp, &con2fb,
                            sizeof(con2fb)) ? -EFAULT : 0;
      case FBIOPUT_CON2FBMAP:
            if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
                  return - EFAULT;
            if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES)
                return -EINVAL;
            if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
                return -EINVAL;
#ifdef CONFIG_KMOD
            if (!registered_fb[con2fb.framebuffer])
                try_to_load(con2fb.framebuffer);
#endif /* CONFIG_KMOD */
            if (!registered_fb[con2fb.framebuffer])
                return -EINVAL;
            event.info = info;
            event.data = &con2fb;
            return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
                                    &event);
      case FBIOBLANK:
            acquire_console_sem();
            info->flags |= FBINFO_MISC_USEREVENT;
            i = fb_blank(info, arg);
            info->flags &= ~FBINFO_MISC_USEREVENT;
            release_console_sem();
            return i;
      default:
            if (fb->fb_ioctl == NULL)
                  return -EINVAL;
            return fb->fb_ioctl(info, cmd, arg);
      }
}

#ifdef CONFIG_COMPAT
struct fb_fix_screeninfo32 {
      char              id[16];
      compat_caddr_t          smem_start;
      u32               smem_len;
      u32               type;
      u32               type_aux;
      u32               visual;
      u16               xpanstep;
      u16               ypanstep;
      u16               ywrapstep;
      u32               line_length;
      compat_caddr_t          mmio_start;
      u32               mmio_len;
      u32               accel;
      u16               reserved[3];
};

struct fb_cmap32 {
      u32               start;
      u32               len;
      compat_caddr_t    red;
      compat_caddr_t    green;
      compat_caddr_t    blue;
      compat_caddr_t    transp;
};

static int fb_getput_cmap(struct inode *inode, struct file *file,
                  unsigned int cmd, unsigned long arg)
{
      struct fb_cmap_user __user *cmap;
      struct fb_cmap32 __user *cmap32;
      __u32 data;
      int err;

      cmap = compat_alloc_user_space(sizeof(*cmap));
      cmap32 = compat_ptr(arg);

      if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
            return -EFAULT;

      if (get_user(data, &cmap32->red) ||
          put_user(compat_ptr(data), &cmap->red) ||
          get_user(data, &cmap32->green) ||
          put_user(compat_ptr(data), &cmap->green) ||
          get_user(data, &cmap32->blue) ||
          put_user(compat_ptr(data), &cmap->blue) ||
          get_user(data, &cmap32->transp) ||
          put_user(compat_ptr(data), &cmap->transp))
            return -EFAULT;

      err = fb_ioctl(inode, file, cmd, (unsigned long) cmap);

      if (!err) {
            if (copy_in_user(&cmap32->start,
                         &cmap->start,
                         2 * sizeof(__u32)))
                  err = -EFAULT;
      }
      return err;
}

static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
                          struct fb_fix_screeninfo32 __user *fix32)
{
      __u32 data;
      int err;

      err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));

      data = (__u32) (unsigned long) fix->smem_start;
      err |= put_user(data, &fix32->smem_start);

      err |= put_user(fix->smem_len, &fix32->smem_len);
      err |= put_user(fix->type, &fix32->type);
      err |= put_user(fix->type_aux, &fix32->type_aux);
      err |= put_user(fix->visual, &fix32->visual);
      err |= put_user(fix->xpanstep, &fix32->xpanstep);
      err |= put_user(fix->ypanstep, &fix32->ypanstep);
      err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
      err |= put_user(fix->line_length, &fix32->line_length);

      data = (__u32) (unsigned long) fix->mmio_start;
      err |= put_user(data, &fix32->mmio_start);

      err |= put_user(fix->mmio_len, &fix32->mmio_len);
      err |= put_user(fix->accel, &fix32->accel);
      err |= copy_to_user(fix32->reserved, fix->reserved,
                      sizeof(fix->reserved));

      return err;
}

static int fb_get_fscreeninfo(struct inode *inode, struct file *file,
                        unsigned int cmd, unsigned long arg)
{
      mm_segment_t old_fs;
      struct fb_fix_screeninfo fix;
      struct fb_fix_screeninfo32 __user *fix32;
      int err;

      fix32 = compat_ptr(arg);

      old_fs = get_fs();
      set_fs(KERNEL_DS);
      err = fb_ioctl(inode, file, cmd, (unsigned long) &fix);
      set_fs(old_fs);

      if (!err)
            err = do_fscreeninfo_to_user(&fix, fix32);

      return err;
}

static long
fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
      struct inode *inode = file->f_path.dentry->d_inode;
      int fbidx = iminor(inode);
      struct fb_info *info = registered_fb[fbidx];
      struct fb_ops *fb = info->fbops;
      long ret = -ENOIOCTLCMD;

      lock_kernel();
      switch(cmd) {
      case FBIOGET_VSCREENINFO:
      case FBIOPUT_VSCREENINFO:
      case FBIOPAN_DISPLAY:
      case FBIOGET_CON2FBMAP:
      case FBIOPUT_CON2FBMAP:
            arg = (unsigned long) compat_ptr(arg);
      case FBIOBLANK:
            ret = fb_ioctl(inode, file, cmd, arg);
            break;

      case FBIOGET_FSCREENINFO:
            ret = fb_get_fscreeninfo(inode, file, cmd, arg);
            break;

      case FBIOGETCMAP:
      case FBIOPUTCMAP:
            ret = fb_getput_cmap(inode, file, cmd, arg);
            break;

      default:
            if (fb->fb_compat_ioctl)
                  ret = fb->fb_compat_ioctl(info, cmd, arg);
            break;
      }
      unlock_kernel();
      return ret;
}
#endif

static int
fb_mmap(struct file *file, struct vm_area_struct * vma)
{
      int fbidx = iminor(file->f_path.dentry->d_inode);
      struct fb_info *info = registered_fb[fbidx];
      struct fb_ops *fb = info->fbops;
      unsigned long off;
      unsigned long start;
      u32 len;

      if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
            return -EINVAL;
      off = vma->vm_pgoff << PAGE_SHIFT;
      if (!fb)
            return -ENODEV;
      if (fb->fb_mmap) {
            int res;
            lock_kernel();
            res = fb->fb_mmap(info, vma);
            unlock_kernel();
            return res;
      }

      lock_kernel();

      /* frame buffer memory */
      start = info->fix.smem_start;
      len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
      if (off >= len) {
            /* memory mapped io */
            off -= len;
            if (info->var.accel_flags) {
                  unlock_kernel();
                  return -EINVAL;
            }
            start = info->fix.mmio_start;
            len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
      }
      unlock_kernel();
      start &= PAGE_MASK;
      if ((vma->vm_end - vma->vm_start + off) > len)
            return -EINVAL;
      off += start;
      vma->vm_pgoff = off >> PAGE_SHIFT;
      /* This is an IO map - tell maydump to skip this VMA */
      vma->vm_flags |= VM_IO | VM_RESERVED;
      fb_pgprotect(file, vma, off);
      if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
                       vma->vm_end - vma->vm_start, vma->vm_page_prot))
            return -EAGAIN;
      return 0;
}

static int
fb_open(struct inode *inode, struct file *file)
{
      int fbidx = iminor(inode);
      struct fb_info *info;
      int res = 0;

      if (fbidx >= FB_MAX)
            return -ENODEV;
#ifdef CONFIG_KMOD
      if (!(info = registered_fb[fbidx]))
            try_to_load(fbidx);
#endif /* CONFIG_KMOD */
      if (!(info = registered_fb[fbidx]))
            return -ENODEV;
      if (!try_module_get(info->fbops->owner))
            return -ENODEV;
      file->private_data = info;
      if (info->fbops->fb_open) {
            res = info->fbops->fb_open(info,1);
            if (res)
                  module_put(info->fbops->owner);
      }
      return res;
}

static int 
fb_release(struct inode *inode, struct file *file)
{
      struct fb_info * const info = file->private_data;

      lock_kernel();
      if (info->fbops->fb_release)
            info->fbops->fb_release(info,1);
      module_put(info->fbops->owner);
      unlock_kernel();
      return 0;
}

static const struct file_operations fb_fops = {
      .owner =    THIS_MODULE,
      .read =           fb_read,
      .write =    fb_write,
      .ioctl =    fb_ioctl,
#ifdef CONFIG_COMPAT
      .compat_ioctl = fb_compat_ioctl,
#endif
      .mmap =           fb_mmap,
      .open =           fb_open,
      .release =  fb_release,
#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
      .get_unmapped_area = get_fb_unmapped_area,
#endif
#ifdef CONFIG_FB_DEFERRED_IO
      .fsync =    fb_deferred_io_fsync,
#endif
};

struct class *fb_class;
EXPORT_SYMBOL(fb_class);
/**
 *    register_framebuffer - registers a frame buffer device
 *    @fb_info: frame buffer info structure
 *
 *    Registers a frame buffer device @fb_info.
 *
 *    Returns negative errno on error, or zero for success.
 *
 */

int
register_framebuffer(struct fb_info *fb_info)
{
      int i;
      struct fb_event event;
      struct fb_videomode mode;

      if (num_registered_fb == FB_MAX)
            return -ENXIO;
      num_registered_fb++;
      for (i = 0 ; i < FB_MAX; i++)
            if (!registered_fb[i])
                  break;
      fb_info->node = i;

      fb_info->dev = device_create(fb_class, fb_info->device,
                             MKDEV(FB_MAJOR, i), "fb%d", i);
      if (IS_ERR(fb_info->dev)) {
            /* Not fatal */
            printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
            fb_info->dev = NULL;
      } else
            fb_init_device(fb_info);

      if (fb_info->pixmap.addr == NULL) {
            fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
            if (fb_info->pixmap.addr) {
                  fb_info->pixmap.size = FBPIXMAPSIZE;
                  fb_info->pixmap.buf_align = 1;
                  fb_info->pixmap.scan_align = 1;
                  fb_info->pixmap.access_align = 32;
                  fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
            }
      }     
      fb_info->pixmap.offset = 0;

      if (!fb_info->pixmap.blit_x)
            fb_info->pixmap.blit_x = ~(u32)0;

      if (!fb_info->pixmap.blit_y)
            fb_info->pixmap.blit_y = ~(u32)0;

      if (!fb_info->modelist.prev || !fb_info->modelist.next)
            INIT_LIST_HEAD(&fb_info->modelist);

      fb_var_to_videomode(&mode, &fb_info->var);
      fb_add_videomode(&mode, &fb_info->modelist);
      registered_fb[i] = fb_info;

      event.info = fb_info;
      fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
      return 0;
}


/**
 *    unregister_framebuffer - releases a frame buffer device
 *    @fb_info: frame buffer info structure
 *
 *    Unregisters a frame buffer device @fb_info.
 *
 *    Returns negative errno on error, or zero for success.
 *
 *      This function will also notify the framebuffer console
 *      to release the driver.
 *
 *      This is meant to be called within a driver's module_exit()
 *      function. If this is called outside module_exit(), ensure
 *      that the driver implements fb_open() and fb_release() to
 *      check that no processes are using the device.
 */

int
unregister_framebuffer(struct fb_info *fb_info)
{
      struct fb_event event;
      int i, ret = 0;

      i = fb_info->node;
      if (!registered_fb[i]) {
            ret = -EINVAL;
            goto done;
      }

      event.info = fb_info;
      ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);

      if (ret) {
            ret = -EINVAL;
            goto done;
      }

      if (fb_info->pixmap.addr &&
          (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
            kfree(fb_info->pixmap.addr);
      fb_destroy_modelist(&fb_info->modelist);
      registered_fb[i]=NULL;
      num_registered_fb--;
      fb_cleanup_device(fb_info);
      device_destroy(fb_class, MKDEV(FB_MAJOR, i));
      event.info = fb_info;
      fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
done:
      return ret;
}

/**
 *    fb_set_suspend - low level driver signals suspend
 *    @info: framebuffer affected
 *    @state: 0 = resuming, !=0 = suspending
 *
 *    This is meant to be used by low level drivers to
 *    signal suspend/resume to the core & clients.
 *    It must be called with the console semaphore held
 */
void fb_set_suspend(struct fb_info *info, int state)
{
      struct fb_event event;

      event.info = info;
      if (state) {
            fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
            info->state = FBINFO_STATE_SUSPENDED;
      } else {
            info->state = FBINFO_STATE_RUNNING;
            fb_notifier_call_chain(FB_EVENT_RESUME, &event);
      }
}

/**
 *    fbmem_init - init frame buffer subsystem
 *
 *    Initialize the frame buffer subsystem.
 *
 *    NOTE: This function is _only_ to be called by drivers/char/mem.c.
 *
 */

static int __init
fbmem_init(void)
{
      create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL);

      if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
            printk("unable to get major %d for fb devs\n", FB_MAJOR);

      fb_class = class_create(THIS_MODULE, "graphics");
      if (IS_ERR(fb_class)) {
            printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
            fb_class = NULL;
      }
      return 0;
}

#ifdef MODULE
module_init(fbmem_init);
static void __exit
fbmem_exit(void)
{
      class_destroy(fb_class);
      unregister_chrdev(FB_MAJOR, "fb");
}

module_exit(fbmem_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Framebuffer base");
#else
subsys_initcall(fbmem_init);
#endif

int fb_new_modelist(struct fb_info *info)
{
      struct fb_event event;
      struct fb_var_screeninfo var = info->var;
      struct list_head *pos, *n;
      struct fb_modelist *modelist;
      struct fb_videomode *m, mode;
      int err = 1;

      list_for_each_safe(pos, n, &info->modelist) {
            modelist = list_entry(pos, struct fb_modelist, list);
            m = &modelist->mode;
            fb_videomode_to_var(&var, m);
            var.activate = FB_ACTIVATE_TEST;
            err = fb_set_var(info, &var);
            fb_var_to_videomode(&mode, &var);
            if (err || !fb_mode_is_equal(m, &mode)) {
                  list_del(pos);
                  kfree(pos);
            }
      }

      err = 1;

      if (!list_empty(&info->modelist)) {
            event.info = info;
            err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
      }

      return err;
}

static char *video_options[FB_MAX] __read_mostly;
static int ofonly __read_mostly;

/**
 * fb_get_options - get kernel boot parameters
 * @name:   framebuffer name as it would appear in
 *          the boot parameter line
 *          (video=<name>:<options>)
 * @option: the option will be stored here
 *
 * NOTE: Needed to maintain backwards compatibility
 */
int fb_get_options(char *name, char **option)
{
      char *opt, *options = NULL;
      int opt_len, retval = 0;
      int name_len = strlen(name), i;

      if (name_len && ofonly && strncmp(name, "offb", 4))
            retval = 1;

      if (name_len && !retval) {
            for (i = 0; i < FB_MAX; i++) {
                  if (video_options[i] == NULL)
                        continue;
                  opt_len = strlen(video_options[i]);
                  if (!opt_len)
                        continue;
                  opt = video_options[i];
                  if (!strncmp(name, opt, name_len) &&
                      opt[name_len] == ':')
                        options = opt + name_len + 1;
            }
      }
      if (options && !strncmp(options, "off", 3))
            retval = 1;

      if (option)
            *option = options;

      return retval;
}

#ifndef MODULE
/**
 *    video_setup - process command line options
 *    @options: string of options
 *
 *    Process command line options for frame buffer subsystem.
 *
 *    NOTE: This function is a __setup and __init function.
 *            It only stores the options.  Drivers have to call
 *            fb_get_options() as necessary.
 *
 *    Returns zero.
 *
 */
static int __init video_setup(char *options)
{
      int i, global = 0;

      if (!options || !*options)
            global = 1;

      if (!global && !strncmp(options, "ofonly", 6)) {
            ofonly = 1;
            global = 1;
      }

      if (!global && !strstr(options, "fb:")) {
            fb_mode_option = options;
            global = 1;
      }

      if (!global) {
            for (i = 0; i < FB_MAX; i++) {
                  if (video_options[i] == NULL) {
                        video_options[i] = options;
                        break;
                  }

            }
      }

      return 1;
}
__setup("video=", video_setup);
#endif

    /*
     *  Visible symbols for modules
     */

EXPORT_SYMBOL(register_framebuffer);
EXPORT_SYMBOL(unregister_framebuffer);
EXPORT_SYMBOL(num_registered_fb);
EXPORT_SYMBOL(registered_fb);
EXPORT_SYMBOL(fb_show_logo);
EXPORT_SYMBOL(fb_set_var);
EXPORT_SYMBOL(fb_blank);
EXPORT_SYMBOL(fb_pan_display);
EXPORT_SYMBOL(fb_get_buffer_offset);
EXPORT_SYMBOL(fb_set_suspend);
EXPORT_SYMBOL(fb_get_options);

MODULE_LICENSE("GPL");

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