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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 <linuxcomp.h>

#include <linux/string.h>

#include <linux/module.h>

#include <linux/tty.h>

#include <linux/fb.h>

#include <linux/slab.h>

#include <asm/uaccess.h>

static u16 red2[] = {

    0x0000, 0xaaaa

};

static u16 green2[] = {

    0x0000, 0xaaaa

};

static u16 blue2[] = {

    0x0000, 0xaaaa

};

static u16 red4[] = {

    0x0000, 0xaaaa, 0x5555, 0xffff

};

static u16 green4[] = {

    0x0000, 0xaaaa, 0x5555, 0xffff

};

static u16 blue4[] = {

    0x0000, 0xaaaa, 0x5555, 0xffff

};

static u16 red8[] = {

    0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa

};

static u16 green8[] = {

    0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa

};

static u16 blue8[] = {

    0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa

};

static u16 red16[] = {

    0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,

    0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff

};

static u16 green16[] = {

    0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa,

    0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff

};

static u16 blue16[] = {

    0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,

    0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff

};

static struct fb_cmap default_2_colors = {

    0, 2, red2, green2, blue2, NULL

};

static struct fb_cmap default_8_colors = {

    0, 8, red8, green8, blue8, NULL

};

static struct fb_cmap default_4_colors = {

    0, 4, red4, green4, blue4, NULL

};

static struct fb_cmap default_16_colors = {

    0, 16, red16, green16, blue16, NULL

};

/**

 *      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 -1 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)))

            return -1;

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

            return -1;

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

            return -1;

        if (transp) {

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

                return -1;

        } else

            cmap->transp = NULL;

    }

    cmap->start = 0;

    cmap->len = len;

    fb_copy_cmap(fb_default_cmap(len), cmap, 0);

    return 0;

}

/**

 *      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)

{

        if (cmap->red)

                kfree(cmap->red);

        if (cmap->green)

                kfree(cmap->green);

        if (cmap->blue)

                kfree(cmap->blue);

        if (cmap->transp)

                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

 *      @fsfromto: determine copy method

 *

 *      Copy contents of colormap from @from to @to.

 *

 *      @fsfromto accepts the following integer parameters:

 *      0: memcpy function

 *      1: copy_from_user() function to copy from userspace

 *      2: copy_to_user() function to copy to userspace

 *

 */

int fb_copy_cmap(struct fb_cmap *from, struct fb_cmap *to, int fsfromto)

{

    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);

    switch (fsfromto) {

    case 0:

        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);

        break;

    case 1:

        if (copy_from_user(to->red+tooff, from->red+fromoff, size))

                return -EFAULT;

        if (copy_from_user(to->green+tooff, from->green+fromoff, size))

                return -EFAULT;

        if (copy_from_user(to->blue+tooff, from->blue+fromoff, size))

                return -EFAULT;

        if (from->transp && to->transp)

            if (copy_from_user(to->transp+tooff, from->transp+fromoff, size))

                    return -EFAULT;    

        break;

    case 2:

        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;

        break;

    }

    return 0;

}

/**

 *      fb_set_cmap - set the colormap

 *      @cmap: frame buffer colormap structure

 *      @kspc: boolean, 0 copy local, 1 get_user() function

 *      @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, int kspc, struct fb_info *info)

{

    int i, start;

    u16 *red, *green, *blue, *transp;

    u_int hred, hgreen, hblue, htransp;

    red = cmap->red;

    green = cmap->green;

    blue = cmap->blue;

    transp = cmap->transp;

    start = cmap->start;

    if (start < 0 || !info->fbops->fb_setcolreg)

        return -EINVAL;

    for (i = 0; i < cmap->len; i++) {

        if (kspc) {

            hred = *red;

            hgreen = *green;

            hblue = *blue;

            htransp = transp ? *transp : 0xffff;

        } else {

            hred = *red;

            hgreen = *green;

            hblue = *blue;

            htransp = transp ? *transp : 0xffff;

            //get_user(hred, red);

            //get_user(hgreen, green);

            //get_user(hblue, blue);

            //if (transp)

                //get_user(htransp, transp);

            //else

                //htransp = 0xffff;

        }

        red++;

        green++;

        blue++;

        if (transp)

            transp++;

        if (info->fbops->fb_setcolreg(start++, hred, hgreen, hblue, htransp, info))

            return 0;

    }

    return 0;

}

/**

 *      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.

 *

 */

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 < 2; i++) {

        red2[i] = ~red2[i];

        green2[i] = ~green2[i];

        blue2[i] = ~blue2[i];

    }

    for (i = 0; i < 4; i++) {

        red4[i] = ~red4[i];

        green4[i] = ~green4[i];

        blue4[i] = ~blue4[i];

    }

    for (i = 0; i < 8; i++) {

        red8[i] = ~red8[i];

        green8[i] = ~green8[i];

        blue8[i] = ~blue8[i];

    }

    for (i = 0; i < 16; 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);