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/*

 *  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

 *

 *      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(struct fb_cmap *cmap, int len, int transp)

{

    int size = len*sizeof(u16);

    if (cmap->len != len) {

        fb_dealloc_cmap(cmap);

        if (!len)

            return 0;

        if (!(cmap->red = kmalloc(size, GFP_ATOMIC)))

            goto fail;

        if (!(cmap->green = kmalloc(size, GFP_ATOMIC)))

            goto fail;

        if (!(cmap->blue = kmalloc(size, GFP_ATOMIC)))

            goto fail;

        if (transp) {

            if (!(cmap->transp = kmalloc(size, GFP_ATOMIC)))

                goto fail;

        } else

            cmap->transp = NULL;

    }

    cmap->start = 0;

    cmap->len = len;

    fb_copy_cmap(fb_default_cmap(len), cmap);

    return 0;

fail:

    fb_dealloc_cmap(cmap);

    return -ENOMEM;

}

/**

 *      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 (cmap->start < 0 || (!info->fbops->fb_setcolreg &&

                                !info->fbops->fb_setcmap))

                return -EINVAL;

        memset(&umap, 0, sizeof(struct fb_cmap));

        rc = fb_alloc_cmap(&umap, cmap->len, cmap->transp != NULL);

        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))) {

                fb_dealloc_cmap(&umap);

                return -EFAULT;

        }

        umap.start = cmap->start;

        rc = fb_set_cmap(&umap, info);

        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);