fbmem.c

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

#include <linux/module.h>

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

#if defined(__mc68000__) || defined(CONFIG_APUS)
#include <asm/setup.h>
#endif

#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>

#include <linux/fb.h>

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

#define FBPIXMAPSIZE	(1024 * 8)

struct fb_info *registered_fb[FB_MAX];
int num_registered_fb;

/*
 * 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)
{
	unsigned char mask[9] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff };
	unsigned char redmask, greenmask, bluemask;
	int redshift, greenshift, blueshift;
	int i;
	const unsigned char *clut = logo->clut;

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

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

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

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

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

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

	if (fb_get_color_depth(&info->var, &info->fix) == 3)
		fg = 7;

	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;

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->dy = info->var.yres - image->height;
	} 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;
		image->dx = info->var.xres - image->width;
	} 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;
		image->dy = info->var.yres - image->height;
	}

	image->data = dst;
}

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

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

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

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

	if (info->flags & FBINFO_MISC_TILEBLITTING)
		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;
	}

	if (depth >= 8) {
		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 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;		
	return fb_logo.logo->height;
}

int fb_show_logo(struct fb_info *info, int rotate)
{
	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 (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
		return 0;

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

	if (fb_logo.needs_cmapreset)
		fb_set_logocmap(info, fb_logo.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, fb_logo.logo, palette);
		else
			fb_set_logo_directpalette(info, fb_logo.logo, palette);

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

	if (fb_logo.depth <= 4) {
		logo_new = kmalloc(fb_logo.logo->width * fb_logo.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, fb_logo.logo, logo_new, fb_logo.depth);
	}

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

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

	fb_do_show_logo(info, &image, rotate);

	kfree(palette);
	if (saved_pseudo_palette != NULL)
		info->pseudo_palette = saved_pseudo_palette;
	kfree(logo_new);
	kfree(logo_rotate);
	return fb_logo.logo->height;
}
#else
int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }
int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
#endif /* CONFIG_LOGO */

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

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

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

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

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

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

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

	if (p >= total_size)
		return 0;

	if (count >= total_size)
		count = total_size;

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

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

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

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

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

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

			src = (u32 __iomem *) src8;
		}

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

	kfree(buffer);

	return (err) ? err : cnt;
}

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

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

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

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

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

	if (p > total_size)
		return -EFBIG;

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

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

		count = total_size - p;
	}

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

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

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

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

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

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

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

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

			dst = (u32 __iomem *) dst8;
		}

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

	kfree(buffer);

	return (cnt) ? cnt : err;
}

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

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

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

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

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

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

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

	if (var->activate & FB_ACTIVATE_INV_MODE) {
		struct fb_videomode mode1, mode2;
		int ret = 0;

		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);

		return ret;
	}

	if ((var->activate & FB_ACTIVATE_FORCE) ||
	    memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
		if (!info->fbops->fb_check_var) {
			*var = info->var;
			return 0;
		}

		if ((err = info->fbops->fb_check_var(var, info)))
			return err;

		if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
			struct fb_videomode mode;
			int err = 0;

			info->var = *var;
			if (info->fbops->fb_set_par)
				info->fbops->fb_set_par(info);

			fb_pan_display(info, &info->var);

			fb_set_cmap(&info->cmap, info);

			fb_var_to_videomode(&mode, &info->var);

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

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

				info->flags &= ~FBINFO_MISC_USEREVENT;
				event.info = info;
				fb_notifier_call_chain(evnt, &event);
			}
		}
	}
	return 0;
}

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

 	if (blank > FB_BLANK_POWERDOWN)
 		blank = FB_BLANK_POWERDOWN;

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

 	if (!ret) {
		struct fb_event event;

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

 	return ret;
}

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

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

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

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