--- /dev/null
+/*
+ * 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);
Code Review / kvmfornfv.git / blobdiff