[linux-2.6-block.git] / drivers / video / fbcmap.c

/*
 *  linux/drivers/video/fbcmap.c -- Colormap handling for frame buffer devices
 *
 *	Created 15 Jun 1997 by Geert Uytterhoeven
 *
 *	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/string.h>
#include <linux/module.h>
#include <linux/fb.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

static u16 red2[] __read_mostly = {
    0x0000, 0xaaaa
};
static u16 green2[] __read_mostly = {
    0x0000, 0xaaaa
};
static u16 blue2[] __read_mostly = {
    0x0000, 0xaaaa
};

static u16 red4[] __read_mostly = {
    0x0000, 0xaaaa, 0x5555, 0xffff
};
static u16 green4[] __read_mostly = {
    0x0000, 0xaaaa, 0x5555, 0xffff
};
static u16 blue4[] __read_mostly = {
    0x0000, 0xaaaa, 0x5555, 0xffff
};

static u16 red8[] __read_mostly = {
    0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa
};
static u16 green8[] __read_mostly = {
    0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa
};
static u16 blue8[] __read_mostly = {
    0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa
};

static u16 red16[] __read_mostly = {
    0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,
    0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff
};
static u16 green16[] __read_mostly = {
    0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa,
    0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff
};
static u16 blue16[] __read_mostly = {
    0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,
    0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff
};

static const struct fb_cmap default_2_colors = {
    .len=2, .red=red2, .green=green2, .blue=blue2
};
static const struct fb_cmap default_8_colors = {
    .len=8, .red=red8, .green=green8, .blue=blue8
};
static const struct fb_cmap default_4_colors = {
    .len=4, .red=red4, .green=green4, .blue=blue4
};
static const struct fb_cmap default_16_colors = {
    .len=16, .red=red16, .green=green16, .blue=blue16
};


/**
 *	fb_alloc_cmap - allocate a colormap
 *	@cmap: frame buffer colormap structure
 *	@len: length of @cmap
 *	@transp: boolean, 1 if there is transparency, 0 otherwise
 *	@flags: flags for kmalloc memory allocation
 *
 *	Allocates memory for a colormap @cmap.  @len is the
 *	number of entries in the palette.
 *
 *	Returns negative errno on error, or zero on success.
 *
 */

int fb_alloc_cmap_gfp(struct fb_cmap *cmap, int len, int transp, gfp_t flags)
{
	int size = len * sizeof(u16);
	int ret = -ENOMEM;

	if (cmap->len != len) {
		fb_dealloc_cmap(cmap);
		if (!len)
			return 0;

		cmap->red = kmalloc(size, flags);
		if (!cmap->red)
			goto fail;
		cmap->green = kmalloc(size, flags);
		if (!cmap->green)
			goto fail;
		cmap->blue = kmalloc(size, flags);
		if (!cmap->blue)
			goto fail;
		if (transp) {
			cmap->transp = kmalloc(size, flags);
			if (!cmap->transp)
				goto fail;
		} else {
			cmap->transp = NULL;
		}
	}
	cmap->start = 0;
	cmap->len = len;
	ret = fb_copy_cmap(fb_default_cmap(len), cmap);
	if (ret)
		goto fail;
	return 0;

fail:
	fb_dealloc_cmap(cmap);
	return ret;
}

int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp)
{
	return fb_alloc_cmap_gfp(cmap, len, transp, GFP_ATOMIC);
}

/**
 *      fb_dealloc_cmap - deallocate a colormap
 *      @cmap: frame buffer colormap structure
 *
 *      Deallocates a colormap that was previously allocated with
 *      fb_alloc_cmap().
 *
 */

void fb_dealloc_cmap(struct fb_cmap *cmap)
{
	kfree(cmap->red);
	kfree(cmap->green);
	kfree(cmap->blue);
	kfree(cmap->transp);

	cmap->red = cmap->green = cmap->blue = cmap->transp = NULL;
	cmap->len = 0;
}

/**
 *	fb_copy_cmap - copy a colormap
 *	@from: frame buffer colormap structure
 *	@to: frame buffer colormap structure
 *
 *	Copy contents of colormap from @from to @to.
 */

int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to)
{
	int tooff = 0, fromoff = 0;
	int size;

	if (to->start > from->start)
		fromoff = to->start - from->start;
	else
		tooff = from->start - to->start;
	size = to->len - tooff;
	if (size > (int) (from->len - fromoff))
		size = from->len - fromoff;
	if (size <= 0)
		return -EINVAL;
	size *= sizeof(u16);

	memcpy(to->red+tooff, from->red+fromoff, size);
	memcpy(to->green+tooff, from->green+fromoff, size);
	memcpy(to->blue+tooff, from->blue+fromoff, size);
	if (from->transp && to->transp)
		memcpy(to->transp+tooff, from->transp+fromoff, size);
	return 0;
}

int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to)
{
	int tooff = 0, fromoff = 0;
	int size;

	if (to->start > from->start)
		fromoff = to->start - from->start;
	else
		tooff = from->start - to->start;
	size = to->len - tooff;
	if (size > (int) (from->len - fromoff))
		size = from->len - fromoff;
	if (size <= 0)
		return -EINVAL;
	size *= sizeof(u16);

	if (copy_to_user(to->red+tooff, from->red+fromoff, size))
		return -EFAULT;
	if (copy_to_user(to->green+tooff, from->green+fromoff, size))
		return -EFAULT;
	if (copy_to_user(to->blue+tooff, from->blue+fromoff, size))
		return -EFAULT;
	if (from->transp && to->transp)
		if (copy_to_user(to->transp+tooff, from->transp+fromoff, size))
			return -EFAULT;
	return 0;
}

/**
 *	fb_set_cmap - set the colormap
 *	@cmap: frame buffer colormap structure
 *	@info: frame buffer info structure
 *
 *	Sets the colormap @cmap for a screen of device @info.
 *
 *	Returns negative errno on error, or zero on success.
 *
 */

int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info)
{
	int i, start, rc = 0;
	u16 *red, *green, *blue, *transp;
	u_int hred, hgreen, hblue, htransp = 0xffff;

	red = cmap->red;
	green = cmap->green;
	blue = cmap->blue;
	transp = cmap->transp;
	start = cmap->start;

	if (start < 0 || (!info->fbops->fb_setcolreg &&
			  !info->fbops->fb_setcmap))
		return -EINVAL;
	if (info->fbops->fb_setcmap) {
		rc = info->fbops->fb_setcmap(cmap, info);
	} else {
		for (i = 0; i < cmap->len; i++) {
			hred = *red++;
			hgreen = *green++;
			hblue = *blue++;
			if (transp)
				htransp = *transp++;
			if (info->fbops->fb_setcolreg(start++,
						      hred, hgreen, hblue,
						      htransp, info))
				break;
		}
	}
	if (rc == 0)
		fb_copy_cmap(cmap, &info->cmap);

	return rc;
}

int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info)
{
	int rc, size = cmap->len * sizeof(u16);
	struct fb_cmap umap;

	if (size < 0 || size < cmap->len)
		return -E2BIG;

	memset(&umap, 0, sizeof(struct fb_cmap));
	rc = fb_alloc_cmap_gfp(&umap, cmap->len, cmap->transp != NULL,
				GFP_KERNEL);
	if (rc)
		return rc;
	if (copy_from_user(umap.red, cmap->red, size) ||
	    copy_from_user(umap.green, cmap->green, size) ||
	    copy_from_user(umap.blue, cmap->blue, size) ||
	    (cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) {
		rc = -EFAULT;
		goto out;
	}
	umap.start = cmap->start;
	if (!lock_fb_info(info)) {
		rc = -ENODEV;
		goto out;
	}
	if (cmap->start < 0 || (!info->fbops->fb_setcolreg &&
				!info->fbops->fb_setcmap)) {
		rc = -EINVAL;
		goto out1;
	}
	rc = fb_set_cmap(&umap, info);
out1:
	unlock_fb_info(info);
out:
	fb_dealloc_cmap(&umap);
	return rc;
}

/**
 *	fb_default_cmap - get default colormap
 *	@len: size of palette for a depth
 *
 *	Gets the default colormap for a specific screen depth.  @len
 *	is the size of the palette for a particular screen depth.
 *
 *	Returns pointer to a frame buffer colormap structure.
 *
 */

const struct fb_cmap *fb_default_cmap(int len)
{
    if (len <= 2)
	return &default_2_colors;
    if (len <= 4)
	return &default_4_colors;
    if (len <= 8)
	return &default_8_colors;
    return &default_16_colors;
}


/**
 *	fb_invert_cmaps - invert all defaults colormaps
 *
 *	Invert all default colormaps.
 *
 */

void fb_invert_cmaps(void)
{
    u_int i;

    for (i = 0; i < ARRAY_SIZE(red2); i++) {
	red2[i] = ~red2[i];
	green2[i] = ~green2[i];
	blue2[i] = ~blue2[i];
    }
    for (i = 0; i < ARRAY_SIZE(red4); i++) {
	red4[i] = ~red4[i];
	green4[i] = ~green4[i];
	blue4[i] = ~blue4[i];
    }
    for (i = 0; i < ARRAY_SIZE(red8); i++) {
	red8[i] = ~red8[i];
	green8[i] = ~green8[i];
	blue8[i] = ~blue8[i];
    }
    for (i = 0; i < ARRAY_SIZE(red16); i++) {
	red16[i] = ~red16[i];
	green16[i] = ~green16[i];
	blue16[i] = ~blue16[i];
    }
}


    /*
     *  Visible symbols for modules
     */

EXPORT_SYMBOL(fb_alloc_cmap);
EXPORT_SYMBOL(fb_dealloc_cmap);
EXPORT_SYMBOL(fb_copy_cmap);
EXPORT_SYMBOL(fb_set_cmap);
EXPORT_SYMBOL(fb_default_cmap);
EXPORT_SYMBOL(fb_invert_cmaps);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/video/fbcmap.c -- Colormap handling for frame buffer devices
	3	*
	4	* Created 15 Jun 1997 by Geert Uytterhoeven
	5	*
	6	* 2001 - Documented with DocBook
	7	* - Brad Douglas <brad@neruo.com>
	8	*
	9	* This file is subject to the terms and conditions of the GNU General Public
	10	* License. See the file COPYING in the main directory of this archive for
	11	* more details.
	12	*/
	13
	14	#include <linux/string.h>
	15	#include <linux/module.h>
1da177e4 LT	16	#include <linux/fb.h>
1da177e4 LT	17	#include <linux/slab.h>
84902b7a	18	#include <linux/uaccess.h>
1da177e4	19
adf6b206	20	static u16 red2[] __read_mostly = {
1da177e4 LT	21	0x0000, 0xaaaa
1da177e4 LT	22	};
adf6b206	23	static u16 green2[] __read_mostly = {
1da177e4 LT	24	0x0000, 0xaaaa
1da177e4 LT	25	};
adf6b206	26	static u16 blue2[] __read_mostly = {
1da177e4 LT	27	0x0000, 0xaaaa
	28	};
	29
adf6b206	30	static u16 red4[] __read_mostly = {
1da177e4 LT	31	0x0000, 0xaaaa, 0x5555, 0xffff
1da177e4 LT	32	};
adf6b206	33	static u16 green4[] __read_mostly = {
1da177e4 LT	34	0x0000, 0xaaaa, 0x5555, 0xffff
1da177e4 LT	35	};
adf6b206	36	static u16 blue4[] __read_mostly = {
1da177e4 LT	37	0x0000, 0xaaaa, 0x5555, 0xffff
	38	};
	39
adf6b206	40	static u16 red8[] __read_mostly = {
1da177e4 LT	41	0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa
1da177e4 LT	42	};
adf6b206	43	static u16 green8[] __read_mostly = {
1da177e4 LT	44	0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa
1da177e4 LT	45	};
adf6b206	46	static u16 blue8[] __read_mostly = {
1da177e4 LT	47	0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa
	48	};
	49
adf6b206	50	static u16 red16[] __read_mostly = {
1da177e4 LT	51	0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,
	52	0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff
	53	};
adf6b206	54	static u16 green16[] __read_mostly = {
1da177e4 LT	55	0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa,
	56	0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff
	57	};
adf6b206	58	static u16 blue16[] __read_mostly = {
1da177e4 LT	59	0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,
	60	0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff
	61	};
	62
adf6b206 HD	63	static const struct fb_cmap default_2_colors = {
adf6b206 HD	64	.len=2, .red=red2, .green=green2, .blue=blue2
1da177e4	65	};
adf6b206 HD	66	static const struct fb_cmap default_8_colors = {
adf6b206 HD	67	.len=8, .red=red8, .green=green8, .blue=blue8
1da177e4	68	};
adf6b206 HD	69	static const struct fb_cmap default_4_colors = {
adf6b206 HD	70	.len=4, .red=red4, .green=green4, .blue=blue4
1da177e4	71	};
adf6b206 HD	72	static const struct fb_cmap default_16_colors = {
adf6b206 HD	73	.len=16, .red=red16, .green=green16, .blue=blue16
1da177e4 LT	74	};
	75
	76
adf6b206	77
1da177e4 LT	78	/**
	79	* fb_alloc_cmap - allocate a colormap
	80	* @cmap: frame buffer colormap structure
	81	* @len: length of @cmap
	82	* @transp: boolean, 1 if there is transparency, 0 otherwise
22a95949	83	* @flags: flags for kmalloc memory allocation
1da177e4 LT	84	*
	85	* Allocates memory for a colormap @cmap. @len is the
	86	* number of entries in the palette.
	87	*
db77ec27	88	* Returns negative errno on error, or zero on success.
1da177e4 LT	89	*
	90	*/
	91
1e7c7804	92	int fb_alloc_cmap_gfp(struct fb_cmap *cmap, int len, int transp, gfp_t flags)
1da177e4	93	{
c353103d	94	int size = len * sizeof(u16);
1e7c7804	95	int ret = -ENOMEM;
1da177e4	96
c353103d DC	97	if (cmap->len != len) {
	98	fb_dealloc_cmap(cmap);
	99	if (!len)
	100	return 0;
	101
1e7c7804	102	cmap->red = kmalloc(size, flags);
c353103d DC	103	if (!cmap->red)
c353103d DC	104	goto fail;
1e7c7804	105	cmap->green = kmalloc(size, flags);
c353103d DC	106	if (!cmap->green)
c353103d DC	107	goto fail;
1e7c7804	108	cmap->blue = kmalloc(size, flags);
c353103d DC	109	if (!cmap->blue)
	110	goto fail;
	111	if (transp) {
1e7c7804	112	cmap->transp = kmalloc(size, flags);
c353103d DC	113	if (!cmap->transp)
	114	goto fail;
	115	} else {
	116	cmap->transp = NULL;
	117	}
	118	}
	119	cmap->start = 0;
	120	cmap->len = len;
1e7c7804 DC	121	ret = fb_copy_cmap(fb_default_cmap(len), cmap);
	122	if (ret)
	123	goto fail;
c353103d	124	return 0;
1da177e4 LT	125
1da177e4 LT	126	fail:
c353103d	127	fb_dealloc_cmap(cmap);
1e7c7804 DC	128	return ret;
	129	}
	130
	131	int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp)
	132	{
	133	return fb_alloc_cmap_gfp(cmap, len, transp, GFP_ATOMIC);
1da177e4 LT	134	}
	135
	136	/**
	137	* fb_dealloc_cmap - deallocate a colormap
	138	* @cmap: frame buffer colormap structure
	139	*
	140	* Deallocates a colormap that was previously allocated with
	141	* fb_alloc_cmap().
	142	*
	143	*/
	144
	145	void fb_dealloc_cmap(struct fb_cmap *cmap)
	146	{
	147	kfree(cmap->red);
	148	kfree(cmap->green);
	149	kfree(cmap->blue);
	150	kfree(cmap->transp);
	151
	152	cmap->red = cmap->green = cmap->blue = cmap->transp = NULL;
	153	cmap->len = 0;
	154	}
	155
	156	/**
	157	* fb_copy_cmap - copy a colormap
	158	* @from: frame buffer colormap structure
	159	* @to: frame buffer colormap structure
	160	*
	161	* Copy contents of colormap from @from to @to.
	162	*/
	163
adf6b206	164	int fb_copy_cmap(const struct fb_cmap from, struct fb_cmap to)
1da177e4 LT	165	{
	166	int tooff = 0, fromoff = 0;
	167	int size;
	168
	169	if (to->start > from->start)
	170	fromoff = to->start - from->start;
	171	else
	172	tooff = from->start - to->start;
	173	size = to->len - tooff;
	174	if (size > (int) (from->len - fromoff))
	175	size = from->len - fromoff;
	176	if (size <= 0)
	177	return -EINVAL;
	178	size *= sizeof(u16);
	179
	180	memcpy(to->red+tooff, from->red+fromoff, size);
	181	memcpy(to->green+tooff, from->green+fromoff, size);
	182	memcpy(to->blue+tooff, from->blue+fromoff, size);
	183	if (from->transp && to->transp)
	184	memcpy(to->transp+tooff, from->transp+fromoff, size);
	185	return 0;
	186	}
	187
adf6b206	188	int fb_cmap_to_user(const struct fb_cmap from, struct fb_cmap_user to)
1da177e4 LT	189	{
	190	int tooff = 0, fromoff = 0;
	191	int size;
	192
	193	if (to->start > from->start)
	194	fromoff = to->start - from->start;
	195	else
	196	tooff = from->start - to->start;
	197	size = to->len - tooff;
	198	if (size > (int) (from->len - fromoff))
	199	size = from->len - fromoff;
	200	if (size <= 0)
	201	return -EINVAL;
	202	size *= sizeof(u16);
	203
	204	if (copy_to_user(to->red+tooff, from->red+fromoff, size))
	205	return -EFAULT;
	206	if (copy_to_user(to->green+tooff, from->green+fromoff, size))
	207	return -EFAULT;
	208	if (copy_to_user(to->blue+tooff, from->blue+fromoff, size))
	209	return -EFAULT;
	210	if (from->transp && to->transp)
	211	if (copy_to_user(to->transp+tooff, from->transp+fromoff, size))
	212	return -EFAULT;
	213	return 0;
	214	}
	215
	216	/**
	217	* fb_set_cmap - set the colormap
	218	* @cmap: frame buffer colormap structure
	219	* @info: frame buffer info structure
	220	*
	221	* Sets the colormap @cmap for a screen of device @info.
	222	*
	223	* Returns negative errno on error, or zero on success.
	224	*
	225	*/
	226
	227	int fb_set_cmap(struct fb_cmap cmap, struct fb_info info)
	228	{
03e259a9	229	int i, start, rc = 0;
1da177e4 LT	230	u16 red, green, blue, transp;
	231	u_int hred, hgreen, hblue, htransp = 0xffff;
	232
	233	red = cmap->red;
	234	green = cmap->green;
	235	blue = cmap->blue;
	236	transp = cmap->transp;
	237	start = cmap->start;
	238
71494376 BH	239	if (start < 0 \|\| (!info->fbops->fb_setcolreg &&
71494376 BH	240	!info->fbops->fb_setcmap))
1da177e4	241	return -EINVAL;
03e259a9 MJ	242	if (info->fbops->fb_setcmap) {
	243	rc = info->fbops->fb_setcmap(cmap, info);
	244	} else {
	245	for (i = 0; i < cmap->len; i++) {
	246	hred = *red++;
	247	hgreen = *green++;
	248	hblue = *blue++;
	249	if (transp)
	250	htransp = *transp++;
	251	if (info->fbops->fb_setcolreg(start++,
	252	hred, hgreen, hblue,
	253	htransp, info))
	254	break;
	255	}
1da177e4	256	}
03e259a9 MJ	257	if (rc == 0)
	258	fb_copy_cmap(cmap, &info->cmap);
	259
	260	return rc;
1da177e4 LT	261	}
	262
	263	int fb_set_user_cmap(struct fb_cmap_user cmap, struct fb_info info)
	264	{
03e259a9 MJ	265	int rc, size = cmap->len * sizeof(u16);
03e259a9 MJ	266	struct fb_cmap umap;
1da177e4	267
1e7c7804 DC	268	if (size < 0 \|\| size < cmap->len)
	269	return -E2BIG;
	270
03e259a9	271	memset(&umap, 0, sizeof(struct fb_cmap));
1e7c7804 DC	272	rc = fb_alloc_cmap_gfp(&umap, cmap->len, cmap->transp != NULL,
1e7c7804 DC	273	GFP_KERNEL);
03e259a9	274	if (rc)
71494376	275	return rc;
03e259a9 MJ	276	if (copy_from_user(umap.red, cmap->red, size) \|\|
	277	copy_from_user(umap.green, cmap->green, size) \|\|
	278	copy_from_user(umap.blue, cmap->blue, size) \|\|
	279	(cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) {
1f5e31d7 AR	280	rc = -EFAULT;
1f5e31d7 AR	281	goto out;
71494376	282	}
03e259a9	283	umap.start = cmap->start;
1f5e31d7 AR	284	if (!lock_fb_info(info)) {
	285	rc = -ENODEV;
	286	goto out;
	287	}
	288	if (cmap->start < 0 \|\| (!info->fbops->fb_setcolreg &&
	289	!info->fbops->fb_setcmap)) {
	290	rc = -EINVAL;
	291	goto out1;
	292	}
03e259a9	293	rc = fb_set_cmap(&umap, info);
1f5e31d7 AR	294	out1:
	295	unlock_fb_info(info);
	296	out:
03e259a9 MJ	297	fb_dealloc_cmap(&umap);
03e259a9 MJ	298	return rc;
1da177e4 LT	299	}
	300
	301	/**
	302	* fb_default_cmap - get default colormap
	303	* @len: size of palette for a depth
	304	*
	305	* Gets the default colormap for a specific screen depth. @len
	306	* is the size of the palette for a particular screen depth.
	307	*
	308	* Returns pointer to a frame buffer colormap structure.
	309	*
	310	*/
	311
adf6b206	312	const struct fb_cmap *fb_default_cmap(int len)
1da177e4 LT	313	{
	314	if (len <= 2)
	315	return &default_2_colors;
	316	if (len <= 4)
	317	return &default_4_colors;
	318	if (len <= 8)
	319	return &default_8_colors;
	320	return &default_16_colors;
	321	}
	322
	323
	324	/**
	325	* fb_invert_cmaps - invert all defaults colormaps
	326	*
	327	* Invert all default colormaps.
	328	*
	329	*/
	330
	331	void fb_invert_cmaps(void)
	332	{
	333	u_int i;
	334
adf6b206	335	for (i = 0; i < ARRAY_SIZE(red2); i++) {
1da177e4 LT	336	red2[i] = ~red2[i];
	337	green2[i] = ~green2[i];
	338	blue2[i] = ~blue2[i];
	339	}
adf6b206	340	for (i = 0; i < ARRAY_SIZE(red4); i++) {
1da177e4 LT	341	red4[i] = ~red4[i];
	342	green4[i] = ~green4[i];
	343	blue4[i] = ~blue4[i];
	344	}
adf6b206	345	for (i = 0; i < ARRAY_SIZE(red8); i++) {
1da177e4 LT	346	red8[i] = ~red8[i];
	347	green8[i] = ~green8[i];
	348	blue8[i] = ~blue8[i];
	349	}
adf6b206	350	for (i = 0; i < ARRAY_SIZE(red16); i++) {
1da177e4 LT	351	red16[i] = ~red16[i];
	352	green16[i] = ~green16[i];
	353	blue16[i] = ~blue16[i];
	354	}
	355	}
	356
	357
	358	/*
	359	* Visible symbols for modules
	360	*/
	361
	362	EXPORT_SYMBOL(fb_alloc_cmap);
	363	EXPORT_SYMBOL(fb_dealloc_cmap);
	364	EXPORT_SYMBOL(fb_copy_cmap);
	365	EXPORT_SYMBOL(fb_set_cmap);
	366	EXPORT_SYMBOL(fb_default_cmap);
	367	EXPORT_SYMBOL(fb_invert_cmaps);