init android origin source code

1 files changed, 1962 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/drivers/video/fbmem.c b/ANDROID_3.4.5/drivers/video/fbmem.c
new file mode 100644
index 00000000..c6ce416a
--- /dev/null
+++ b/ANDROID_3.4.5/drivers/video/fbmem.c
@@ -0,0 +1,1962 @@
+/*
+ *  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/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/seq_file.h>
+#include <linux/console.h>
+#include <linux/kmod.h>
+#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)
+
+static DEFINE_MUTEX(registration_lock);
+struct fb_info *registered_fb[FB_MAX] __read_mostly;
+int num_registered_fb __read_mostly;
+
+static struct fb_info *get_fb_info(unsigned int idx)
+{
+	struct fb_info *fb_info;
+
+	if (idx >= FB_MAX)
+		return ERR_PTR(-ENODEV);
+
+	mutex_lock(&registration_lock);
+	fb_info = registered_fb[idx];
+	if (fb_info)
+		atomic_inc(&fb_info->count);
+	mutex_unlock(&registration_lock);
+
+	return fb_info;
+}
+
+static void put_fb_info(struct fb_info *fb_info)
+{
+	if (!atomic_dec_and_test(&fb_info->count))
+		return;
+	if (fb_info->fbops->fb_destroy)
+		fb_info->fbops->fb_destroy(fb_info);
+}
+
+int lock_fb_info(struct fb_info *info)
+{
+	mutex_lock(&info->lock);
+	if (!info->fbops) {
+		mutex_unlock(&info->lock);
+		return 0;
+	}
+	return 1;
+}
+EXPORT_SYMBOL(lock_fb_info);
+
+/*
+ * 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 < 32 + 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++) {
+		if (fb_logo_ex[i].logo->type != fb_logo.logo->type) {
+			fb_logo_ex[i].logo = NULL;
+			continue;
+		}
+		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 void *fb_seq_start(struct seq_file *m, loff_t *pos)
+{
+	mutex_lock(&registration_lock);
+	return (*pos < FB_MAX) ? pos : NULL;
+}
+
+static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	(*pos)++;
+	return (*pos < FB_MAX) ? pos : NULL;
+}
+
+static void fb_seq_stop(struct seq_file *m, void *v)
+{
+	mutex_unlock(&registration_lock);
+}
+
+static int fb_seq_show(struct seq_file *m, void *v)
+{
+	int i = *(loff_t *)v;
+	struct fb_info *fi = registered_fb[i];
+
+	if (fi)
+		seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
+	return 0;
+}
+
+static const struct seq_operations proc_fb_seq_ops = {
+	.start	= fb_seq_start,
+	.next	= fb_seq_next,
+	.stop	= fb_seq_stop,
+	.show	= fb_seq_show,
+};
+
+static int proc_fb_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &proc_fb_seq_ops);
+}
+
+static const struct file_operations fb_proc_fops = {
+	.owner		= THIS_MODULE,
+	.open		= proc_fb_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
+
+/*
+ * We hold a reference to the fb_info in file->private_data,
+ * but if the current registered fb has changed, we don't
+ * actually want to use it.
+ *
+ * So look up the fb_info using the inode minor number,
+ * and just verify it against the reference we have.
+ */
+static struct fb_info *file_fb_info(struct file *file)
+{
+	struct inode *inode = file->f_path.dentry->d_inode;
+	int fbidx = iminor(inode);
+	struct fb_info *info = registered_fb[fbidx];
+
+	if (info != file->private_data)
+		info = NULL;
+	return info;
+}
+
+static ssize_t
+fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+{
+	unsigned long p = *ppos;
+	struct fb_info *info = file_fb_info(file);
+	u8 *buffer, *dst;
+	u8 __iomem *src;
+	int c, 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 = (u8 __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;
+		fb_memcpy_fromfb(dst, src, c);
+		dst += c;
+		src += c;
+
+		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 fb_info *info = file_fb_info(file);
+	u8 *buffer, *src;
+	u8 __iomem *dst;
+	int c, 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 = (u8 __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;
+		}
+
+		fb_memcpy_tofb(dst, src, c);
+		dst += c;
+		src += c;
+		*ppos += c;
+		buf += c;
+		cnt += c;
+		count -= c;
+	}
+
+	kfree(buffer);
+
+	return (cnt) ? cnt : err;
+}
+
+int
+fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
+{
+	struct fb_fix_screeninfo *fix = &info->fix;
+	unsigned int yres = info->var.yres;
+	int err = 0;
+
+	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 ||
+	    var->yoffset > info->var.yres_virtual - yres ||
+	    var->xoffset > info->var.xres_virtual - info->var.xres)
+		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;
+
+		/* When using FOURCC mode, make sure the red, green, blue and
+		 * transp fields are set to 0.
+		 */
+		if ((info->fix.capabilities & FB_CAP_FOURCC) &&
+		    var->grayscale > 1) {
+			if (var->red.offset     || var->green.offset    ||
+			    var->blue.offset    || var->transp.offset   ||
+			    var->red.length     || var->green.length    ||
+			    var->blue.length    || var->transp.length   ||
+			    var->red.msb_right  || var->green.msb_right ||
+			    var->blue.msb_right || var->transp.msb_right)
+				return -EINVAL;
+		}
+
+		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_var_screeninfo old_var;
+			struct fb_videomode mode;
+
+			if (info->fbops->fb_get_caps) {
+				ret = fb_check_caps(info, var, activate);
+
+				if (ret)
+					goto done;
+			}
+
+			old_var = info->var;
+			info->var = *var;
+
+			if (info->fbops->fb_set_par) {
+				ret = info->fbops->fb_set_par(info);
+
+				if (ret) {
+					info->var = old_var;
+					printk(KERN_WARNING "detected "
+						"fb_set_par error, "
+						"error code: %d\n", ret);
+					goto done;
+				}
+			}
+
+			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;
+				event.data = &mode;
+				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 long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
+			unsigned long arg)
+{
+	struct fb_ops *fb;
+	struct fb_var_screeninfo var;
+	struct fb_fix_screeninfo fix;
+	struct fb_con2fbmap con2fb;
+	struct fb_cmap cmap_from;
+	struct fb_cmap_user cmap;
+	struct fb_event event;
+	void __user *argp = (void __user *)arg;
+	long ret = 0;
+
+	switch (cmd) {
+	case FBIOGET_VSCREENINFO:
+		if (!lock_fb_info(info))
+			return -ENODEV;
+		var = info->var;
+		unlock_fb_info(info);
+
+		ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
+		break;
+	case FBIOPUT_VSCREENINFO:
+		if (copy_from_user(&var, argp, sizeof(var)))
+			return -EFAULT;
+		if (!lock_fb_info(info))
+			return -ENODEV;
+		console_lock();
+		info->flags |= FBINFO_MISC_USEREVENT;
+		ret = fb_set_var(info, &var);
+		info->flags &= ~FBINFO_MISC_USEREVENT;
+		console_unlock();
+		unlock_fb_info(info);
+		if (!ret && copy_to_user(argp, &var, sizeof(var)))
+			ret = -EFAULT;
+		break;
+	case FBIOGET_FSCREENINFO:
+		if (!lock_fb_info(info))
+			return -ENODEV;
+		fix = info->fix;
+		unlock_fb_info(info);
+
+		ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
+		break;
+	case FBIOPUTCMAP:
+		if (copy_from_user(&cmap, argp, sizeof(cmap)))
+			return -EFAULT;
+		ret = fb_set_user_cmap(&cmap, info);
+		break;
+	case FBIOGETCMAP:
+		if (copy_from_user(&cmap, argp, sizeof(cmap)))
+			return -EFAULT;
+		if (!lock_fb_info(info))
+			return -ENODEV;
+		cmap_from = info->cmap;
+		unlock_fb_info(info);
+		ret = fb_cmap_to_user(&cmap_from, &cmap);
+		break;
+	case FBIOPAN_DISPLAY:
+		if (copy_from_user(&var, argp, sizeof(var)))
+			return -EFAULT;
+		if (!lock_fb_info(info))
+			return -ENODEV;
+		console_lock();
+		ret = fb_pan_display(info, &var);
+		console_unlock();
+		unlock_fb_info(info);
+		if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
+			return -EFAULT;
+		break;
+	case FBIO_CURSOR:
+		ret = -EINVAL;
+		break;
+	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.data = &con2fb;
+		if (!lock_fb_info(info))
+			return -ENODEV;
+		event.info = info;
+		fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
+		unlock_fb_info(info);
+		ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
+		break;
+	case FBIOPUT_CON2FBMAP:
+		if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
+			return -EFAULT;
+		if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
+			return -EINVAL;
+		if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
+			return -EINVAL;
+		if (!registered_fb[con2fb.framebuffer])
+			request_module("fb%d", con2fb.framebuffer);
+		if (!registered_fb[con2fb.framebuffer]) {
+			ret = -EINVAL;
+			break;
+		}
+		event.data = &con2fb;
+		if (!lock_fb_info(info))
+			return -ENODEV;
+		event.info = info;
+		ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
+		unlock_fb_info(info);
+		break;
+	case FBIOBLANK:
+		if (!lock_fb_info(info))
+			return -ENODEV;
+		console_lock();
+		info->flags |= FBINFO_MISC_USEREVENT;
+		ret = fb_blank(info, arg);
+		info->flags &= ~FBINFO_MISC_USEREVENT;
+		console_unlock();
+		unlock_fb_info(info);
+		break;
+	default:
+		if (!lock_fb_info(info))
+			return -ENODEV;
+		fb = info->fbops;
+		if (fb->fb_ioctl)
+			ret = fb->fb_ioctl(info, cmd, arg);
+		else
+			ret = -ENOTTY;
+		unlock_fb_info(info);
+	}
+	return ret;
+}
+
+static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct fb_info *info = file_fb_info(file);
+
+	if (!info)
+		return -ENODEV;
+	return do_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 fb_info *info, 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 = do_fb_ioctl(info, 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 fb_info *info, 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 = do_fb_ioctl(info, 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 fb_info *info = file_fb_info(file);
+	struct fb_ops *fb;
+	long ret = -ENOIOCTLCMD;
+
+	if (!info)
+		return -ENODEV;
+	fb = info->fbops;
+	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 = do_fb_ioctl(info, cmd, arg);
+		break;
+
+	case FBIOGET_FSCREENINFO:
+		ret = fb_get_fscreeninfo(info, cmd, arg);
+		break;
+
+	case FBIOGETCMAP:
+	case FBIOPUTCMAP:
+		ret = fb_getput_cmap(info, cmd, arg);
+		break;
+
+	default:
+		if (fb->fb_compat_ioctl)
+			ret = fb->fb_compat_ioctl(info, cmd, arg);
+		break;
+	}
+	return ret;
+}
+#endif
+
+static int
+fb_mmap(struct file *file, struct vm_area_struct * vma)
+{
+	struct fb_info *info = file_fb_info(file);
+	struct fb_ops *fb;
+	unsigned long off;
+	unsigned long start;
+	u32 len;
+
+	if (!info)
+		return -ENODEV;
+	if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
+		return -EINVAL;
+	off = vma->vm_pgoff << PAGE_SHIFT;
+	fb = info->fbops;
+	if (!fb)
+		return -ENODEV;
+	mutex_lock(&info->mm_lock);
+	if (fb->fb_mmap) {
+		int res;
+		res = fb->fb_mmap(info, vma);
+		mutex_unlock(&info->mm_lock);
+		return res;
+	}
+
+	/* 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) {
+			mutex_unlock(&info->mm_lock);
+			return -EINVAL;
+		}
+		start = info->fix.mmio_start;
+		len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
+	}
+	mutex_unlock(&info->mm_lock);
+	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;
+	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	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)
+__acquires(&info->lock)
+__releases(&info->lock)
+{
+	int fbidx = iminor(inode);
+	struct fb_info *info;
+	int res = 0;
+
+	info = get_fb_info(fbidx);
+	if (!info) {
+		request_module("fb%d", fbidx);
+		info = get_fb_info(fbidx);
+		if (!info)
+			return -ENODEV;
+	}
+	if (IS_ERR(info))
+		return PTR_ERR(info);
+
+	mutex_lock(&info->lock);
+	if (!try_module_get(info->fbops->owner)) {
+		res = -ENODEV;
+		goto out;
+	}
+	file->private_data = info;
+	if (info->fbops->fb_open) {
+		res = info->fbops->fb_open(info,1);
+		if (res)
+			module_put(info->fbops->owner);
+	}
+#ifdef CONFIG_FB_DEFERRED_IO
+	if (info->fbdefio)
+		fb_deferred_io_open(info, inode, file);
+#endif
+out:
+	mutex_unlock(&info->lock);
+	if (res)
+		put_fb_info(info);
+	return res;
+}
+
+static int 
+fb_release(struct inode *inode, struct file *file)
+__acquires(&info->lock)
+__releases(&info->lock)
+{
+	struct fb_info * const info = file->private_data;
+
+	mutex_lock(&info->lock);
+	if (info->fbops->fb_release)
+		info->fbops->fb_release(info,1);
+	module_put(info->fbops->owner);
+	mutex_unlock(&info->lock);
+	put_fb_info(info);
+	return 0;
+}
+
+static const struct file_operations fb_fops = {
+	.owner =	THIS_MODULE,
+	.read =		fb_read,
+	.write =	fb_write,
+	.unlocked_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
+	.llseek =	default_llseek,
+};
+
+struct class *fb_class;
+EXPORT_SYMBOL(fb_class);
+
+static int fb_check_foreignness(struct fb_info *fi)
+{
+	const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
+
+	fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
+
+#ifdef __BIG_ENDIAN
+	fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
+#else
+	fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
+#endif /* __BIG_ENDIAN */
+
+	if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
+		pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
+		       "support this framebuffer\n", fi->fix.id);
+		return -ENOSYS;
+	} else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
+		pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
+		       "support this framebuffer\n", fi->fix.id);
+		return -ENOSYS;
+	}
+
+	return 0;
+}
+
+static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
+{
+	/* is the generic aperture base the same as the HW one */
+	if (gen->base == hw->base)
+		return true;
+	/* is the generic aperture base inside the hw base->hw base+size */
+	if (gen->base > hw->base && gen->base < hw->base + hw->size)
+		return true;
+	return false;
+}
+
+static bool fb_do_apertures_overlap(struct apertures_struct *gena,
+				    struct apertures_struct *hwa)
+{
+	int i, j;
+	if (!hwa || !gena)
+		return false;
+
+	for (i = 0; i < hwa->count; ++i) {
+		struct aperture *h = &hwa->ranges[i];
+		for (j = 0; j < gena->count; ++j) {
+			struct aperture *g = &gena->ranges[j];
+			printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
+				(unsigned long long)g->base,
+				(unsigned long long)g->size,
+				(unsigned long long)h->base,
+				(unsigned long long)h->size);
+			if (apertures_overlap(g, h))
+				return true;
+		}
+	}
+
+	return false;
+}
+
+static int do_unregister_framebuffer(struct fb_info *fb_info);
+
+#define VGA_FB_PHYS 0xA0000
+static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
+				     const char *name, bool primary)
+{
+	int i;
+
+	/* check all firmware fbs and kick off if the base addr overlaps */
+	for (i = 0 ; i < FB_MAX; i++) {
+		struct apertures_struct *gen_aper;
+		if (!registered_fb[i])
+			continue;
+
+		if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
+			continue;
+
+		gen_aper = registered_fb[i]->apertures;
+		if (fb_do_apertures_overlap(gen_aper, a) ||
+			(primary && gen_aper && gen_aper->count &&
+			 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
+
+			printk(KERN_INFO "fb: conflicting fb hw usage "
+			       "%s vs %s - removing generic driver\n",
+			       name, registered_fb[i]->fix.id);
+			do_unregister_framebuffer(registered_fb[i]);
+		}
+	}
+}
+
+static int do_register_framebuffer(struct fb_info *fb_info)
+{
+	int i;
+	struct fb_event event;
+	struct fb_videomode mode;
+
+	if (fb_check_foreignness(fb_info))
+		return -ENOSYS;
+
+	do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
+					 fb_is_primary_device(fb_info));
+
+	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;
+	atomic_set(&fb_info->count, 1);
+	mutex_init(&fb_info->lock);
+	mutex_init(&fb_info->mm_lock);
+
+	fb_info->dev = device_create(fb_class, fb_info->device,
+				     MKDEV(FB_MAJOR, i), NULL, "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;
+	if (!lock_fb_info(fb_info))
+		return -ENODEV;
+	fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
+	unlock_fb_info(fb_info);
+	return 0;
+}
+
+static int do_unregister_framebuffer(struct fb_info *fb_info)
+{
+	struct fb_event event;
+	int i, ret = 0;
+
+	i = fb_info->node;
+	if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
+		return -EINVAL;
+
+	if (!lock_fb_info(fb_info))
+		return -ENODEV;
+	event.info = fb_info;
+	ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
+	unlock_fb_info(fb_info);
+
+	if (ret)
+		return -EINVAL;
+
+	unlink_framebuffer(fb_info);
+	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);
+	event.info = fb_info;
+	fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
+
+	/* this may free fb info */
+	put_fb_info(fb_info);
+	return 0;
+}
+
+int unlink_framebuffer(struct fb_info *fb_info)
+{
+	int i;
+
+	i = fb_info->node;
+	if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
+		return -EINVAL;
+
+	if (fb_info->dev) {
+		device_destroy(fb_class, MKDEV(FB_MAJOR, i));
+		fb_info->dev = NULL;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(unlink_framebuffer);
+
+void remove_conflicting_framebuffers(struct apertures_struct *a,
+				     const char *name, bool primary)
+{
+	mutex_lock(&registration_lock);
+	do_remove_conflicting_framebuffers(a, name, primary);
+	mutex_unlock(&registration_lock);
+}
+EXPORT_SYMBOL(remove_conflicting_framebuffers);
+
+/**
+ *	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 ret;
+
+	mutex_lock(&registration_lock);
+	ret = do_register_framebuffer(fb_info);
+	mutex_unlock(&registration_lock);
+
+	return ret;
+}
+
+/**
+ *	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)
+{
+	int ret;
+
+	mutex_lock(&registration_lock);
+	ret = do_unregister_framebuffer(fb_info);
+	mutex_unlock(&registration_lock);
+
+	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)
+{
+	proc_create("fb", 0, NULL, &fb_proc_fops);
+
+	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)
+{
+	remove_proc_entry("fb", NULL);
+	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)) {
+		if (!lock_fb_info(info))
+			return -ENODEV;
+		event.info = info;
+		err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
+		unlock_fb_info(info);
+	}
+
+	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 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;
+			if (!video_options[i][0])
+				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 && !strchr(options, ':')) {
+ 		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");