fbdev: move fbdev core files to separate directory

Instead of having fbdev framework core files at the root fbdev
directory, mixed with random fbdev device drivers, move the fbdev core
files to a separate core directory. This makes it much clearer which of
the files are actually part of the fbdev framework, and which are part
of device drivers.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Rob Clark <robdclark@gmail.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 2002 insertions, 0 deletions

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
new file mode 100644
index 000000000000..b6d5008f361f
--- /dev/null
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -0,0 +1,2002 @@
+/*
+ *  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;
+EXPORT_SYMBOL(registered_fb);
+
+int num_registered_fb __read_mostly;
+EXPORT_SYMBOL(num_registered_fb);
+
+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;
+}
+EXPORT_SYMBOL(fb_get_buffer_offset);
+
+#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 */
+EXPORT_SYMBOL(fb_show_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_inode(file);
+	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;
+}
+EXPORT_SYMBOL(fb_pan_display);
+
+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;
+}
+EXPORT_SYMBOL(fb_set_var);
+
+int
+fb_blank(struct fb_info *info, int blank)
+{	
+	struct fb_event event;
+	int ret = -EINVAL, early_ret;
+
+ 	if (blank > FB_BLANK_POWERDOWN)
+ 		blank = FB_BLANK_POWERDOWN;
+
+	event.info = info;
+	event.data = &blank;
+
+	early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
+
+	if (info->fbops->fb_blank)
+ 		ret = info->fbops->fb_blank(blank, info);
+
+	if (!ret)
+		fb_notifier_call_chain(FB_EVENT_BLANK, &event);
+	else {
+		/*
+		 * if fb_blank is failed then revert effects of
+		 * the early blank event.
+		 */
+		if (!early_ret)
+			fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
+	}
+
+ 	return ret;
+}
+EXPORT_SYMBOL(fb_blank);
+
+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;
+		console_lock();
+		if (!lock_fb_info(info)) {
+			console_unlock();
+			return -ENODEV;
+		}
+		info->flags |= FBINFO_MISC_USEREVENT;
+		ret = fb_set_var(info, &var);
+		info->flags &= ~FBINFO_MISC_USEREVENT;
+		unlock_fb_info(info);
+		console_unlock();
+		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;
+		console_lock();
+		if (!lock_fb_info(info)) {
+			console_unlock();
+			return -ENODEV;
+		}
+		ret = fb_pan_display(info, &var);
+		unlock_fb_info(info);
+		console_unlock();
+		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;
+		console_lock();
+		if (!lock_fb_info(info)) {
+			console_unlock();
+			return -ENODEV;
+		}
+		event.info = info;
+		ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
+		unlock_fb_info(info);
+		console_unlock();
+		break;
+	case FBIOBLANK:
+		console_lock();
+		if (!lock_fb_info(info)) {
+			console_unlock();
+			return -ENODEV;
+		}
+		info->flags |= FBINFO_MISC_USEREVENT;
+		ret = fb_blank(info, arg);
+		info->flags &= ~FBINFO_MISC_USEREVENT;
+		unlock_fb_info(info);
+		console_unlock();
+		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));
+
+	if (err)
+		return -EFAULT;
+	return 0;
+}
+
+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 mmio_pgoff;
+	unsigned long start;
+	u32 len;
+
+	if (!info)
+		return -ENODEV;
+	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;
+	}
+
+	/*
+	 * Ugh. This can be either the frame buffer mapping, or
+	 * if pgoff points past it, the mmio mapping.
+	 */
+	start = info->fix.smem_start;
+	len = info->fix.smem_len;
+	mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
+	if (vma->vm_pgoff >= mmio_pgoff) {
+		if (info->var.accel_flags) {
+			mutex_unlock(&info->mm_lock);
+			return -EINVAL;
+		}
+
+		vma->vm_pgoff -= mmio_pgoff;
+		start = info->fix.mmio_start;
+		len = info->fix.mmio_len;
+	}
+	mutex_unlock(&info->mm_lock);
+
+	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	fb_pgprotect(file, vma, start);
+
+	return vm_iomap_memory(vma, start, len);
+}
+
+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 int do_remove_conflicting_framebuffers(struct apertures_struct *a,
+					      const char *name, bool primary)
+{
+	int i, ret;
+
+	/* 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: switching to %s from %s\n",
+			       name, registered_fb[i]->fix.id);
+			ret = do_unregister_framebuffer(registered_fb[i]);
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int do_register_framebuffer(struct fb_info *fb_info)
+{
+	int i, ret;
+	struct fb_event event;
+	struct fb_videomode mode;
+
+	if (fb_check_foreignness(fb_info))
+		return -ENOSYS;
+
+	ret = do_remove_conflicting_framebuffers(fb_info->apertures,
+						 fb_info->fix.id,
+						 fb_is_primary_device(fb_info));
+	if (ret)
+		return ret;
+
+	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);
+
+	if (fb_info->skip_vt_switch)
+		pm_vt_switch_required(fb_info->dev, false);
+	else
+		pm_vt_switch_required(fb_info->dev, true);
+
+	fb_var_to_videomode(&mode, &fb_info->var);
+	fb_add_videomode(&mode, &fb_info->modelist);
+	registered_fb[i] = fb_info;
+
+	event.info = fb_info;
+	console_lock();
+	if (!lock_fb_info(fb_info)) {
+		console_unlock();
+		return -ENODEV;
+	}
+
+	fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
+	unlock_fb_info(fb_info);
+	console_unlock();
+	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;
+
+	console_lock();
+	if (!lock_fb_info(fb_info)) {
+		console_unlock();
+		return -ENODEV;
+	}
+
+	event.info = fb_info;
+	ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
+	unlock_fb_info(fb_info);
+	console_unlock();
+
+	if (ret)
+		return -EINVAL;
+
+	pm_vt_switch_unregister(fb_info->dev);
+
+	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;
+	console_lock();
+	fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
+	console_unlock();
+
+	/* 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);
+
+int remove_conflicting_framebuffers(struct apertures_struct *a,
+				    const char *name, bool primary)
+{
+	int ret;
+
+	mutex_lock(&registration_lock);
+	ret = do_remove_conflicting_framebuffers(a, name, primary);
+	mutex_unlock(&registration_lock);
+
+	return ret;
+}
+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;
+}
+EXPORT_SYMBOL(register_framebuffer);
+
+/**
+ *	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;
+}
+EXPORT_SYMBOL(unregister_framebuffer);
+
+/**
+ *	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);
+	}
+}
+EXPORT_SYMBOL(fb_set_suspend);
+
+/**
+ *	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)) {
+		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(const 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;
+		}
+	}
+	/* No match, pass global option */
+	if (!options && option && fb_mode_option)
+		options = kstrdup(fb_mode_option, GFP_KERNEL);
+	if (options && !strncmp(options, "off", 3))
+		retval = 1;
+
+	if (option)
+		*option = options;
+
+	return retval;
+}
+EXPORT_SYMBOL(fb_get_options);
+
+#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
+
+MODULE_LICENSE("GPL");