1 files changed, 362 insertions, 0 deletions

diff --git a/drivers/video/fbdev/core/fbcmap.c b/drivers/video/fbdev/core/fbcmap.c
new file mode 100644
index 000000000000..f89245b8ba8e
--- /dev/null
+++ b/drivers/video/fbdev/core/fbcmap.c
@@ -0,0 +1,362 @@
+/*
+ *  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;
+        }
+
+        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);