fbdev: move fbdev core files to separate directory

Instead of having fbdev framework core files at the root fbdev
directory, mixed with random fbdev device drivers, move the fbdev core
files to a separate core directory. This makes it much clearer which of
the files are actually part of the fbdev framework, and which are part
of device drivers.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Rob Clark <robdclark@gmail.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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);