Orange Pi5 kernel

/*
 *  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;
 
<------>flags |= __GFP_NOWARN;
 
<------>if (cmap->len != len) {
<------><------>fb_dealloc_cmap(cmap);
<------><------>if (!len)
<------><------><------>return 0;
 
<------><------>cmap->red = kzalloc(size, flags);
<------><------>if (!cmap->red)
<------><------><------>goto fail;
<------><------>cmap->green = kzalloc(size, flags);
<------><------>if (!cmap->green)
<------><------><------>goto fail;
<------><------>cmap->blue = kzalloc(size, flags);
<------><------>if (!cmap->blue)
<------><------><------>goto fail;
<------><------>if (transp) {
<------><------><------>cmap->transp = kzalloc(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)
{
<------>unsigned int tooff = 0, fromoff = 0;
<------>size_t size;
 
<------>if (to->start > from->start)
<------><------>fromoff = to->start - from->start;
<------>else
<------><------>tooff = from->start - to->start;
<------>if (fromoff >= from->len || tooff >= to->len)
<------><------>return -EINVAL;
 
<------>size = min_t(size_t, to->len - tooff, 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)
{
<------>unsigned int tooff = 0, fromoff = 0;
<------>size_t size;
 
<------>if (to->start > from->start)
<------><------>fromoff = to->start - from->start;
<------>else
<------><------>tooff = from->start - to->start;
<------>if (fromoff >= from->len || tooff >= to->len)
<------><------>return -EINVAL;
 
<------>size = min_t(size_t, to->len - tooff, 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;
<------>lock_fb_info(info);
<------>rc = fb_set_cmap(&umap, info);
<------>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);