[PATCH] fbcon/fbdev: Move softcursor out of fbdev to fbcon

According to Jon Smirl, filling in the field fb_cursor with soft_cursor for
drivers that do not support hardware cursors is redundant.  The soft_cursor
function is usable by all drivers because it is just a wrapper around
fb_imageblit.  And because soft_cursor is an fbcon-specific hook, the file is
moved to the console directory.

Thus, drivers that do not support hardware cursors can leave the fb_cursor
field blank.  For drivers that do, they can fill up this field with their own
version.

The end result is a smaller code size.  And if the framebuffer console is not
loaded, module/kernel size is also reduced because the soft_cursor module will
also not be loaded.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 80 insertions, 3 deletions

diff --git a/drivers/video/console/Makefile b/drivers/video/console/Makefile
index 42c7b8d..71b4b62 100644
--- a/drivers/video/console/Makefile
+++ b/drivers/video/console/Makefile
@@ -26,7 +26,7 @@ obj-$(CONFIG_PROM_CONSOLE)        += promcon.o promcon_tbl.o
 obj-$(CONFIG_STI_CONSOLE)         += sticon.o sticore.o font.o
 obj-$(CONFIG_VGA_CONSOLE)         += vgacon.o
 obj-$(CONFIG_MDA_CONSOLE)         += mdacon.o
-obj-$(CONFIG_FRAMEBUFFER_CONSOLE) += fbcon.o bitblit.o font.o
+obj-$(CONFIG_FRAMEBUFFER_CONSOLE) += fbcon.o bitblit.o font.o softcursor.o
 ifeq ($(CONFIG_FB_TILEBLITTING),y)
 obj-$(CONFIG_FRAMEBUFFER_CONSOLE)     += tileblit.o
 endif
diff --git a/drivers/video/console/bitblit.c b/drivers/video/console/bitblit.c
index 9f70e51..67857b3 100644
--- a/drivers/video/console/bitblit.c
+++ b/drivers/video/console/bitblit.c
@@ -272,6 +272,7 @@ static void bit_cursor(struct vc_data *vc, struct fb_info *info,
 	int w = (vc->vc_font.width + 7) >> 3, c;
 	int y = real_y(p, vc->vc_y);
 	int attribute, use_sw = (vc->vc_cursor_type & 0x10);
+	int err = 1;
 	char *src;
 
 	cursor.set = 0;
@@ -408,7 +409,11 @@ static void bit_cursor(struct vc_data *vc, struct fb_info *info,
 	cursor.image.depth = 1;
 	cursor.rop = ROP_XOR;
 
-	info->fbops->fb_cursor(info, &cursor);
+	if (info->fbops->fb_cursor)
+		err = info->fbops->fb_cursor(info, &cursor);
+
+	if (err)
+		soft_cursor(info, &cursor);
 
 	ops->cursor_reset = 0;
 }
diff --git a/drivers/video/console/fbcon.h b/drivers/video/console/fbcon.h
index 0738cd6..b68e0e2 100644
--- a/drivers/video/console/fbcon.h
+++ b/drivers/video/console/fbcon.h
@@ -167,5 +167,5 @@ extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info,
 			      struct display *p, struct fbcon_ops *ops);
 #endif
 extern void fbcon_set_bitops(struct fbcon_ops *ops);
-
+extern int  soft_cursor(struct fb_info *info, struct fb_cursor *cursor);
 #endif /* _VIDEO_FBCON_H */
diff --git a/drivers/video/console/softcursor.c b/drivers/video/console/softcursor.c
new file mode 100644
index 0000000..8529bf0
--- /dev/null
+++ b/drivers/video/console/softcursor.c
@@ -0,0 +1,72 @@
+/*
+ * linux/drivers/video/softcursor.c -- Generic software cursor for frame buffer devices
+ *
+ *  Created 14 Nov 2002 by James Simmons
+ *
+ * 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/module.h>
+#include <linux/string.h>
+#include <linux/tty.h>
+#include <linux/fb.h>
+#include <linux/slab.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+int soft_cursor(struct fb_info *info, struct fb_cursor *cursor)
+{
+	unsigned int scan_align = info->pixmap.scan_align - 1;
+	unsigned int buf_align = info->pixmap.buf_align - 1;
+	unsigned int i, size, dsize, s_pitch, d_pitch;
+	struct fb_image *image;
+	u8 *dst, *src;
+
+	if (info->state != FBINFO_STATE_RUNNING)
+		return 0;
+
+	s_pitch = (cursor->image.width + 7) >> 3;
+	dsize = s_pitch * cursor->image.height;
+
+	src = kmalloc(dsize + sizeof(struct fb_image), GFP_ATOMIC);
+	if (!src)
+		return -ENOMEM;
+
+	image = (struct fb_image *) (src + dsize);
+	*image = cursor->image;
+	d_pitch = (s_pitch + scan_align) & ~scan_align;
+
+	size = d_pitch * image->height + buf_align;
+	size &= ~buf_align;
+	dst = fb_get_buffer_offset(info, &info->pixmap, size);
+
+	if (cursor->enable) {
+		switch (cursor->rop) {
+		case ROP_XOR:
+			for (i = 0; i < dsize; i++)
+				src[i] = image->data[i] ^ cursor->mask[i];
+			break;
+		case ROP_COPY:
+		default:
+			for (i = 0; i < dsize; i++)
+				src[i] = image->data[i] & cursor->mask[i];
+			break;
+		}
+	} else
+		memcpy(src, image->data, dsize);
+
+	fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, image->height);
+	image->data = dst;
+	info->fbops->fb_imageblit(info, image);
+	kfree(src);
+	return 0;
+}
+
+EXPORT_SYMBOL(soft_cursor);
+
+MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
+MODULE_DESCRIPTION("Generic software cursor");
+MODULE_LICENSE("GPL");