[PATCH 5/8] fbcon: Console Rotation - Add support for 180-degree console rotation

[PATCH 5/8] fbcon: Console Rotation - Add support for 180-degree console rotation

[Antonino A. Daplas]

Add support for 180-degree (upside down) rotation of the console. To
activate, boot with:

fbcon=rotate:2

Signed-off-by: Antonino Daplas <adaplas@pol.net>

---
 Makefile       |    2 
 fbcon_rotate.c |    3 
 fbcon_rotate.h |    1 
 fbcon_ud.c     |  454 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 459 insertions(+), 1 deletion(-)


diff --git a/drivers/video/console/Makefile b/drivers/video/console/Makefile
index 984f8cd..830ff46 100644
--- a/drivers/video/console/Makefile
+++ b/drivers/video/console/Makefile
@@ -32,7 +32,7 @@ ifeq ($(CONFIG_FB_TILEBLITTING),y)
 obj-$(CONFIG_FRAMEBUFFER_CONSOLE)     += tileblit.o
 endif
 ifeq ($(CONFIG_FRAMEBUFFER_CONSOLE_ROTATION),y)
-obj-$(CONFIG_FRAMEBUFFER_CONSOLE)     += fbcon_rotate.o fbcon_cw.o
+obj-$(CONFIG_FRAMEBUFFER_CONSOLE)     += fbcon_rotate.o fbcon_cw.o fbcon_ud.o
 endif
 
 obj-$(CONFIG_FB_STI)              += sticore.o font.o
diff --git a/drivers/video/console/fbcon_rotate.c b/drivers/video/console/fbcon_rotate.c
index 9df009c..3d64ad1 100644
--- a/drivers/video/console/fbcon_rotate.c
+++ b/drivers/video/console/fbcon_rotate.c
@@ -102,6 +102,9 @@ void fbcon_set_rotate(struct fbcon_ops *
 	case FB_ROTATE_CW:
 		fbcon_rotate_cw(ops);
 		break;
+	case FB_ROTATE_UD:
+		fbcon_rotate_ud(ops);
+		break;
 	}
 }
 EXPORT_SYMBOL(fbcon_set_rotate);
diff --git a/drivers/video/console/fbcon_rotate.h b/drivers/video/console/fbcon_rotate.h
index 8e0320a..0966efc 100644
--- a/drivers/video/console/fbcon_rotate.h
+++ b/drivers/video/console/fbcon_rotate.h
@@ -100,4 +100,5 @@ static inline void rotate_ccw(const char
 }
 
 extern void fbcon_rotate_cw(struct fbcon_ops *ops);
+extern void fbcon_rotate_ud(struct fbcon_ops *ops);
 #endif
diff --git a/drivers/video/console/fbcon_ud.c b/drivers/video/console/fbcon_ud.c
new file mode 100644
index 0000000..2e1d9d4
--- /dev/null
+++ b/drivers/video/console/fbcon_ud.c
@@ -0,0 +1,454 @@
+/*
+ *  linux/drivers/video/console/fbcon_ud.c -- Software Rotation - 180 degrees
+ *
+ *      Copyright (C) 2005 Antonino Daplas <adaplas @pol.net>
+ *
+ *  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/config.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fb.h>
+#include <linux/vt_kern.h>
+#include <linux/console.h>
+#include <asm/types.h>
+#include "fbcon.h"
+#include "fbcon_rotate.h"
+
+/*
+ * Rotation 180 degrees
+ */
+
+static inline void ud_update_attr(u8 *dst, u8 *src, int attribute,
+				  struct vc_data *vc)
+{
+	int i, offset = (vc->vc_font.height < 10) ? 1 : 2;
+	int width = (vc->vc_font.width + 7) >> 3;
+	unsigned int cellsize = vc->vc_font.height * width;
+	u8 c;
+
+	offset = offset * width;
+
+	for (i = 0; i < cellsize; i++) {
+		c = src[i];
+		if (attribute & FBCON_ATTRIBUTE_UNDERLINE && i < offset)
+			c = 0xff;
+		if (attribute & FBCON_ATTRIBUTE_BOLD)
+			c |= c << 1;
+		if (attribute & FBCON_ATTRIBUTE_REVERSE)
+			c = ~c;
+		dst[i] = c;
+	}
+}
+
+
+static void ud_bmove(struct vc_data *vc, struct fb_info *info, int sy,
+		     int sx, int dy, int dx, int height, int width)
+{
+	struct display *p = &fb_display[vc->vc_num];
+	struct fb_copyarea area;
+	u32 vyres = GETVYRES(p->scrollmode, info);
+	u32 vxres = GETVXRES(p->scrollmode, info);
+
+	area.sy = vyres - ((sy + height) * vc->vc_font.height);
+	area.sx = vxres - ((sx + width) * vc->vc_font.width);
+	area.dy = vyres - ((dy + height) * vc->vc_font.height);
+	area.dx = vxres - ((dx + width) * vc->vc_font.width);
+	area.height = height * vc->vc_font.height;
+	area.width  = width * vc->vc_font.width;
+
+	info->fbops->fb_copyarea(info, &area);
+}
+
+static void ud_clear(struct vc_data *vc, struct fb_info *info, int sy,
+		     int sx, int height, int width)
+{
+	struct display *p = &fb_display[vc->vc_num];
+	struct fb_fillrect region;
+	int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
+	u32 vyres = GETVYRES(p->scrollmode, info);
+	u32 vxres = GETVXRES(p->scrollmode, info);
+
+	region.color = attr_bgcol_ec(bgshift,vc);
+	region.dy = vyres - ((sy + height) * vc->vc_font.height);
+	region.dx = vxres - ((sx + width) *  vc->vc_font.width);
+	region.width = width * vc->vc_font.width;
+	region.height = height * vc->vc_font.height;
+	region.rop = ROP_COPY;
+
+	info->fbops->fb_fillrect(info, &region);
+}
+
+static inline void ud_putcs_aligned(struct vc_data *vc, struct fb_info *info,
+				    const u16 *s, u32 attr, u32 cnt,
+				    u32 d_pitch, u32 s_pitch, u32 cellsize,
+				    struct fb_image *image, u8 *buf, u8 *dst)
+{
+	struct fbcon_ops *ops = info->fbcon_par;
+	u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
+	u32 idx = vc->vc_font.width >> 3;
+	u8 *src;
+
+	while (cnt--) {
+		src = ops->fontbuffer + (scr_readw(s--) & charmask)*cellsize;
+
+		if (attr) {
+			ud_update_attr(buf, src, attr, vc);
+			src = buf;
+		}
+
+		if (likely(idx == 1))
+			__fb_pad_aligned_buffer(dst, d_pitch, src, idx,
+						image->height);
+		else
+			fb_pad_aligned_buffer(dst, d_pitch, src, idx,
+					      image->height);
+
+		dst += s_pitch;
+	}
+
+	info->fbops->fb_imageblit(info, image);
+}
+
+static inline void ud_putcs_unaligned(struct vc_data *vc,
+				      struct fb_info *info, const u16 *s,
+				      u32 attr, u32 cnt, u32 d_pitch,
+				      u32 s_pitch, u32 cellsize,
+				      struct fb_image *image, u8 *buf,
+				      u8 *dst)
+{
+	struct fbcon_ops *ops = info->fbcon_par;
+	u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
+	u32 shift_low = 0, mod = vc->vc_font.width % 8;
+	u32 shift_high = 8;
+	u32 idx = vc->vc_font.width >> 3;
+	u8 *src;
+
+	while (cnt--) {
+		src = ops->fontbuffer + (scr_readw(s--) & charmask)*cellsize;
+
+		if (attr) {
+			ud_update_attr(buf, src, attr, vc);
+			src = buf;
+		}
+
+		fb_pad_unaligned_buffer(dst, d_pitch, src, idx,
+					image->height, shift_high,
+					shift_low, mod);
+		shift_low += mod;
+		dst += (shift_low >= 8) ? s_pitch : s_pitch - 1;
+		shift_low &= 7;
+		shift_high = 8 - shift_low;
+	}
+
+	info->fbops->fb_imageblit(info, image);
+
+}
+
+static void ud_putcs(struct vc_data *vc, struct fb_info *info,
+		      const unsigned short *s, int count, int yy, int xx,
+		      int fg, int bg)
+{
+	struct fb_image image;
+	struct display *p = &fb_display[vc->vc_num];
+	struct fbcon_ops *ops = info->fbcon_par;
+	u32 width = (vc->vc_font.width + 7)/8;
+	u32 cellsize = width * vc->vc_font.height;
+	u32 maxcnt = info->pixmap.size/cellsize;
+	u32 scan_align = info->pixmap.scan_align - 1;
+	u32 buf_align = info->pixmap.buf_align - 1;
+	u32 mod = vc->vc_font.width % 8, cnt, pitch, size;
+	u32 attribute = get_attribute(info, scr_readw(s));
+	u8 *dst, *buf = NULL;
+	u32 vyres = GETVYRES(p->scrollmode, info);
+	u32 vxres = GETVXRES(p->scrollmode, info);
+
+	if (!ops->fontbuffer)
+		return;
+
+	image.fg_color = fg;
+	image.bg_color = bg;
+	image.dy = vyres - ((yy * vc->vc_font.height) + vc->vc_font.height);
+	image.dx = vxres - ((xx + count) * vc->vc_font.width);
+	image.height = vc->vc_font.height;
+	image.depth = 1;
+
+	if (attribute) {
+		buf = kmalloc(cellsize, GFP_KERNEL);
+		if (!buf)
+			return;
+	}
+
+	s += count - 1;
+
+	while (count) {
+		if (count > maxcnt)
+			cnt = maxcnt;
+		else
+			cnt = count;
+
+		image.width = vc->vc_font.width * cnt;
+		pitch = ((image.width + 7) >> 3) + scan_align;
+		pitch &= ~scan_align;
+		size = pitch * image.height + buf_align;
+		size &= ~buf_align;
+		dst = fb_get_buffer_offset(info, &info->pixmap, size);
+		image.data = dst;
+
+		if (!mod)
+			ud_putcs_aligned(vc, info, s, attribute, cnt, pitch,
+					 width, cellsize, &image, buf, dst);
+		else
+			ud_putcs_unaligned(vc, info, s, attribute, cnt, pitch,
+					   width, cellsize, &image,
+					   buf, dst);
+
+		image.dx += image.width;
+		count -= cnt;
+		s -= cnt;
+		xx += cnt;
+	}
+
+	/* buf is always NULL except when in monochrome mode, so in this case
+	   it's a gain to check buf against NULL even though kfree() handles
+	   NULL pointers just fine */
+	if (unlikely(buf))
+		kfree(buf);
+
+}
+
+static void ud_clear_margins(struct vc_data *vc, struct fb_info *info,
+			     int bottom_only)
+{
+	unsigned int cw = vc->vc_font.width;
+	unsigned int ch = vc->vc_font.height;
+	unsigned int rw = info->var.xres - (vc->vc_cols*cw);
+	unsigned int bh = info->var.yres - (vc->vc_rows*ch);
+	struct fb_fillrect region;
+	int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
+
+	region.color = attr_bgcol_ec(bgshift,vc);
+	region.rop = ROP_COPY;
+
+	if (rw && !bottom_only) {
+		region.dy = 0;
+		region.dx = info->var.xoffset;
+		region.width  = rw;
+		region.height = info->var.yres_virtual;
+		info->fbops->fb_fillrect(info, &region);
+	}
+
+	if (bh) {
+		region.dy = info->var.yoffset;
+		region.dx = info->var.xoffset;
+                region.height  = bh;
+                region.width = info->var.xres;
+		info->fbops->fb_fillrect(info, &region);
+	}
+}
+
+static void ud_cursor(struct vc_data *vc, struct fb_info *info,
+		      struct display *p, int mode, int softback_lines,
+		      int fg, int bg)
+{
+	struct fb_cursor cursor;
+	struct fbcon_ops *ops = (struct fbcon_ops *) info->fbcon_par;
+	unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
+	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, dx, dy;
+	char *src;
+	u32 vyres = GETVYRES(p->scrollmode, info);
+	u32 vxres = GETVXRES(p->scrollmode, info);
+
+	if (!ops->fontbuffer)
+		return;
+
+	cursor.set = 0;
+
+	if (softback_lines) {
+		if (y + softback_lines >= vc->vc_rows) {
+			mode = CM_ERASE;
+			ops->cursor_flash = 0;
+			return;
+		} else
+			y += softback_lines;
+	}
+
+ 	c = scr_readw((u16 *) vc->vc_pos);
+	attribute = get_attribute(info, c);
+	src = ops->fontbuffer + ((c & charmask) * (w * vc->vc_font.height));
+
+	if (ops->cursor_state.image.data != src ||
+	    ops->cursor_reset) {
+	    ops->cursor_state.image.data = src;
+	    cursor.set |= FB_CUR_SETIMAGE;
+	}
+
+	if (attribute) {
+		u8 *dst;
+
+		dst = kmalloc(w * vc->vc_font.height, GFP_ATOMIC);
+		if (!dst)
+			return;
+		kfree(ops->cursor_data);
+		ops->cursor_data = dst;
+		ud_update_attr(dst, src, attribute, vc);
+		src = dst;
+	}
+
+	if (ops->cursor_state.image.fg_color != fg ||
+	    ops->cursor_state.image.bg_color != bg ||
+	    ops->cursor_reset) {
+		ops->cursor_state.image.fg_color = fg;
+		ops->cursor_state.image.bg_color = bg;
+		cursor.set |= FB_CUR_SETCMAP;
+	}
+
+	if (ops->cursor_state.image.height != vc->vc_font.height ||
+	    ops->cursor_state.image.width != vc->vc_font.width ||
+	    ops->cursor_reset) {
+		ops->cursor_state.image.height = vc->vc_font.height;
+		ops->cursor_state.image.width = vc->vc_font.width;
+		cursor.set |= FB_CUR_SETSIZE;
+	}
+
+	dy = vyres - ((y * vc->vc_font.height) + vc->vc_font.height);
+	dx = vxres - ((vc->vc_x * vc->vc_font.width) + vc->vc_font.width);
+
+	if (ops->cursor_state.image.dx != dx ||
+	    ops->cursor_state.image.dy != dy ||
+	    ops->cursor_reset) {
+		ops->cursor_state.image.dx = dx;
+		ops->cursor_state.image.dy = dy;
+		cursor.set |= FB_CUR_SETPOS;
+	}
+
+	if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
+	    ops->cursor_reset) {
+		ops->cursor_state.hot.x = cursor.hot.y = 0;
+		cursor.set |= FB_CUR_SETHOT;
+	}
+
+	if (cursor.set & FB_CUR_SETSIZE ||
+	    vc->vc_cursor_type != p->cursor_shape ||
+	    ops->cursor_state.mask == NULL ||
+	    ops->cursor_reset) {
+		char *mask = kmalloc(w*vc->vc_font.height, GFP_ATOMIC);
+		int cur_height, size, i = 0;
+		u8 msk = 0xff;
+
+		if (!mask)
+			return;
+
+		kfree(ops->cursor_state.mask);
+		ops->cursor_state.mask = mask;
+
+		p->cursor_shape = vc->vc_cursor_type;
+		cursor.set |= FB_CUR_SETSHAPE;
+
+		switch (p->cursor_shape & CUR_HWMASK) {
+		case CUR_NONE:
+			cur_height = 0;
+			break;
+		case CUR_UNDERLINE:
+			cur_height = (vc->vc_font.height < 10) ? 1 : 2;
+			break;
+		case CUR_LOWER_THIRD:
+			cur_height = vc->vc_font.height/3;
+			break;
+		case CUR_LOWER_HALF:
+			cur_height = vc->vc_font.height >> 1;
+			break;
+		case CUR_TWO_THIRDS:
+			cur_height = (vc->vc_font.height << 1)/3;
+			break;
+		case CUR_BLOCK:
+		default:
+			cur_height = vc->vc_font.height;
+			break;
+		}
+
+		size = cur_height * w;
+
+		while (size--)
+			mask[i++] = msk;
+
+		size = (vc->vc_font.height - cur_height) * w;
+
+		while (size--)
+			mask[i++] = ~msk;
+	}
+
+	switch (mode) {
+	case CM_ERASE:
+		ops->cursor_state.enable = 0;
+		break;
+	case CM_DRAW:
+	case CM_MOVE:
+	default:
+		ops->cursor_state.enable = (use_sw) ? 0 : 1;
+		break;
+	}
+
+	cursor.image.data = src;
+	cursor.image.fg_color = ops->cursor_state.image.fg_color;
+	cursor.image.bg_color = ops->cursor_state.image.bg_color;
+	cursor.image.dx = ops->cursor_state.image.dx;
+	cursor.image.dy = ops->cursor_state.image.dy;
+	cursor.image.height = ops->cursor_state.image.height;
+	cursor.image.width = ops->cursor_state.image.width;
+	cursor.hot.x = ops->cursor_state.hot.x;
+	cursor.hot.y = ops->cursor_state.hot.y;
+	cursor.mask = ops->cursor_state.mask;
+	cursor.enable = ops->cursor_state.enable;
+	cursor.image.depth = 1;
+	cursor.rop = ROP_XOR;
+
+	if (info->fbops->fb_cursor)
+		err = info->fbops->fb_cursor(info, &cursor);
+
+	if (err)
+		soft_cursor(info, &cursor);
+
+	ops->cursor_reset = 0;
+}
+
+int ud_update_start(struct fb_info *info)
+{
+	struct fbcon_ops *ops = info->fbcon_par;
+	struct display *p = &fb_display[ops->currcon];
+	u32 xoffset, yoffset;
+	u32 vyres = GETVYRES(p->scrollmode, info);
+	u32 vxres = GETVXRES(p->scrollmode, info);
+	int err;
+
+	xoffset = (vxres - info->var.xres) - ops->var.xoffset;
+	yoffset = (vyres - info->var.yres) - ops->var.yoffset;
+	ops->var.xoffset = xoffset;
+	ops->var.yoffset = yoffset;
+	err = fb_pan_display(info, &ops->var);
+	ops->var.xoffset = info->var.xoffset;
+	ops->var.yoffset = info->var.yoffset;
+	ops->var.vmode = info->var.vmode;
+	return err;
+}
+
+void fbcon_rotate_ud(struct fbcon_ops *ops)
+{
+	ops->bmove = ud_bmove;
+	ops->clear = ud_clear;
+	ops->putcs = ud_putcs;
+	ops->clear_margins = ud_clear_margins;
+	ops->cursor = ud_cursor;
+	ops->update_start = ud_update_start;
+}
+EXPORT_SYMBOL(fbcon_rotate_ud);
+
+MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
+MODULE_DESCRIPTION("Console Rotation (180 degrees) Support");
+MODULE_LICENSE("GPL");



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