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340 lines
7.7 KiB
340 lines
7.7 KiB
/*
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* linux/drivers/video/fbcmap.c -- Colormap handling for frame buffer devices
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*
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* Created 15 Jun 1997 by Geert Uytterhoeven
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*
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* 2001 - Documented with DocBook
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* - Brad Douglas <brad@neruo.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/fb.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
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static u16 red2[] = {
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0x0000, 0xaaaa
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};
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static u16 green2[] = {
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0x0000, 0xaaaa
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};
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static u16 blue2[] = {
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0x0000, 0xaaaa
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};
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static u16 red4[] = {
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0x0000, 0xaaaa, 0x5555, 0xffff
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};
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static u16 green4[] = {
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0x0000, 0xaaaa, 0x5555, 0xffff
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};
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static u16 blue4[] = {
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0x0000, 0xaaaa, 0x5555, 0xffff
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};
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static u16 red8[] = {
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0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa
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};
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static u16 green8[] = {
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0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa
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};
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static u16 blue8[] = {
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0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa
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};
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static u16 red16[] = {
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0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,
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0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff
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};
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static u16 green16[] = {
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0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa,
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0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff
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};
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static u16 blue16[] = {
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0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,
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0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff
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};
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static struct fb_cmap default_2_colors = {
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0, 2, red2, green2, blue2, NULL
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};
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static struct fb_cmap default_8_colors = {
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0, 8, red8, green8, blue8, NULL
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};
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static struct fb_cmap default_4_colors = {
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0, 4, red4, green4, blue4, NULL
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};
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static struct fb_cmap default_16_colors = {
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0, 16, red16, green16, blue16, NULL
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};
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/**
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* fb_alloc_cmap - allocate a colormap
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* @cmap: frame buffer colormap structure
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* @len: length of @cmap
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* @transp: boolean, 1 if there is transparency, 0 otherwise
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*
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* Allocates memory for a colormap @cmap. @len is the
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* number of entries in the palette.
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*
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* Returns negative errno on error, or zero on success.
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*
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*/
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int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp)
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{
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int size = len*sizeof(u16);
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if (cmap->len != len) {
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fb_dealloc_cmap(cmap);
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if (!len)
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return 0;
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if (!(cmap->red = kmalloc(size, GFP_ATOMIC)))
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goto fail;
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if (!(cmap->green = kmalloc(size, GFP_ATOMIC)))
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goto fail;
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if (!(cmap->blue = kmalloc(size, GFP_ATOMIC)))
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goto fail;
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if (transp) {
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if (!(cmap->transp = kmalloc(size, GFP_ATOMIC)))
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goto fail;
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} else
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cmap->transp = NULL;
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}
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cmap->start = 0;
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cmap->len = len;
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fb_copy_cmap(fb_default_cmap(len), cmap);
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return 0;
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fail:
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fb_dealloc_cmap(cmap);
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return -ENOMEM;
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}
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/**
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* fb_dealloc_cmap - deallocate a colormap
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* @cmap: frame buffer colormap structure
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*
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* Deallocates a colormap that was previously allocated with
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* fb_alloc_cmap().
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*
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*/
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void fb_dealloc_cmap(struct fb_cmap *cmap)
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{
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kfree(cmap->red);
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kfree(cmap->green);
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kfree(cmap->blue);
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kfree(cmap->transp);
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cmap->red = cmap->green = cmap->blue = cmap->transp = NULL;
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cmap->len = 0;
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}
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/**
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* fb_copy_cmap - copy a colormap
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* @from: frame buffer colormap structure
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* @to: frame buffer colormap structure
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*
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* Copy contents of colormap from @from to @to.
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*/
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int fb_copy_cmap(struct fb_cmap *from, struct fb_cmap *to)
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{
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int tooff = 0, fromoff = 0;
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int size;
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if (to->start > from->start)
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fromoff = to->start - from->start;
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else
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tooff = from->start - to->start;
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size = to->len - tooff;
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if (size > (int) (from->len - fromoff))
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size = from->len - fromoff;
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if (size <= 0)
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return -EINVAL;
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size *= sizeof(u16);
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memcpy(to->red+tooff, from->red+fromoff, size);
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memcpy(to->green+tooff, from->green+fromoff, size);
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memcpy(to->blue+tooff, from->blue+fromoff, size);
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if (from->transp && to->transp)
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memcpy(to->transp+tooff, from->transp+fromoff, size);
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return 0;
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}
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int fb_cmap_to_user(struct fb_cmap *from, struct fb_cmap_user *to)
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{
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int tooff = 0, fromoff = 0;
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int size;
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if (to->start > from->start)
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fromoff = to->start - from->start;
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else
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tooff = from->start - to->start;
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size = to->len - tooff;
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if (size > (int) (from->len - fromoff))
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size = from->len - fromoff;
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if (size <= 0)
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return -EINVAL;
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size *= sizeof(u16);
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if (copy_to_user(to->red+tooff, from->red+fromoff, size))
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return -EFAULT;
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if (copy_to_user(to->green+tooff, from->green+fromoff, size))
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return -EFAULT;
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if (copy_to_user(to->blue+tooff, from->blue+fromoff, size))
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return -EFAULT;
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if (from->transp && to->transp)
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if (copy_to_user(to->transp+tooff, from->transp+fromoff, size))
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return -EFAULT;
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return 0;
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}
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/**
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* fb_set_cmap - set the colormap
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* @cmap: frame buffer colormap structure
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* @info: frame buffer info structure
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*
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* Sets the colormap @cmap for a screen of device @info.
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*
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* Returns negative errno on error, or zero on success.
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*
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*/
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int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info)
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{
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int i, start, rc = 0;
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u16 *red, *green, *blue, *transp;
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u_int hred, hgreen, hblue, htransp = 0xffff;
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red = cmap->red;
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green = cmap->green;
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blue = cmap->blue;
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transp = cmap->transp;
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start = cmap->start;
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if (start < 0 || (!info->fbops->fb_setcolreg &&
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!info->fbops->fb_setcmap))
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return -EINVAL;
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if (info->fbops->fb_setcmap) {
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rc = info->fbops->fb_setcmap(cmap, info);
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} else {
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for (i = 0; i < cmap->len; i++) {
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hred = *red++;
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hgreen = *green++;
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hblue = *blue++;
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if (transp)
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htransp = *transp++;
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if (info->fbops->fb_setcolreg(start++,
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hred, hgreen, hblue,
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htransp, info))
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break;
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}
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}
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if (rc == 0)
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fb_copy_cmap(cmap, &info->cmap);
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return rc;
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}
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int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info)
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{
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int rc, size = cmap->len * sizeof(u16);
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struct fb_cmap umap;
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if (cmap->start < 0 || (!info->fbops->fb_setcolreg &&
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!info->fbops->fb_setcmap))
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return -EINVAL;
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memset(&umap, 0, sizeof(struct fb_cmap));
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rc = fb_alloc_cmap(&umap, cmap->len, cmap->transp != NULL);
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if (rc)
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return rc;
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if (copy_from_user(umap.red, cmap->red, size) ||
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copy_from_user(umap.green, cmap->green, size) ||
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copy_from_user(umap.blue, cmap->blue, size) ||
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(cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) {
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fb_dealloc_cmap(&umap);
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return -EFAULT;
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}
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umap.start = cmap->start;
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rc = fb_set_cmap(&umap, info);
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fb_dealloc_cmap(&umap);
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return rc;
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}
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/**
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* fb_default_cmap - get default colormap
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* @len: size of palette for a depth
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*
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* Gets the default colormap for a specific screen depth. @len
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* is the size of the palette for a particular screen depth.
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*
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* Returns pointer to a frame buffer colormap structure.
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*
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*/
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struct fb_cmap *fb_default_cmap(int len)
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{
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if (len <= 2)
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return &default_2_colors;
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if (len <= 4)
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return &default_4_colors;
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if (len <= 8)
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return &default_8_colors;
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return &default_16_colors;
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}
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/**
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* fb_invert_cmaps - invert all defaults colormaps
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*
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* Invert all default colormaps.
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*
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*/
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void fb_invert_cmaps(void)
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{
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u_int i;
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for (i = 0; i < 2; i++) {
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red2[i] = ~red2[i];
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green2[i] = ~green2[i];
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blue2[i] = ~blue2[i];
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}
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for (i = 0; i < 4; i++) {
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red4[i] = ~red4[i];
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green4[i] = ~green4[i];
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blue4[i] = ~blue4[i];
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}
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for (i = 0; i < 8; i++) {
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red8[i] = ~red8[i];
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green8[i] = ~green8[i];
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blue8[i] = ~blue8[i];
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}
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for (i = 0; i < 16; i++) {
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red16[i] = ~red16[i];
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green16[i] = ~green16[i];
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blue16[i] = ~blue16[i];
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}
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}
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/*
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* Visible symbols for modules
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*/
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EXPORT_SYMBOL(fb_alloc_cmap);
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EXPORT_SYMBOL(fb_dealloc_cmap);
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EXPORT_SYMBOL(fb_copy_cmap);
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EXPORT_SYMBOL(fb_set_cmap);
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EXPORT_SYMBOL(fb_default_cmap);
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EXPORT_SYMBOL(fb_invert_cmaps);
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