[PATCH] fbcon: Console Rotation - Add support for 270-degree rotation

Add support for 270-degree (counterclockwise) rotation of the console.  To
activate, boot with:

fbcon=rotate:3

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

1 files changed, 428 insertions, 0 deletions

diff --git a/drivers/video/console/fbcon_ccw.c b/drivers/video/console/fbcon_ccw.c
new file mode 100644
index 000000000000..680aabab73c5
--- /dev/null
+++ b/drivers/video/console/fbcon_ccw.c
@@ -0,0 +1,428 @@
+/*
+ *  linux/drivers/video/console/fbcon_ccw.c -- Software Rotation - 270 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 270 degrees
+ */
+
+static inline void ccw_update_attr(u8 *dst, u8 *src, int attribute,
+				  struct vc_data *vc)
+{
+	int i, j, offset = (vc->vc_font.height < 10) ? 1 : 2;
+	int width = (vc->vc_font.height + 7) >> 3;
+	int mod = vc->vc_font.height % 8;
+	u8 c, msk = ~(0xff << offset), msk1 = 0;
+
+	if (mod)
+		msk <<= (8 - mod);
+
+	if (offset > mod)
+		set_bit(FBCON_BIT(7), (void *)&msk1);
+
+	for (i = 0; i < vc->vc_font.width; i++) {
+		for (j = 0; j < width; j++) {
+			c = *src;
+
+			if (attribute & FBCON_ATTRIBUTE_UNDERLINE) {
+				if (j == width - 1)
+					c |= msk;
+
+				if (msk1 && j == width - 2)
+					c |= msk1;
+			}
+
+			if (attribute & FBCON_ATTRIBUTE_BOLD && i)
+				*(dst - width) |= c;
+
+			if (attribute & FBCON_ATTRIBUTE_REVERSE)
+				c = ~c;
+			src++;
+			*dst++ = c;
+		}
+	}
+}
+
+
+static void ccw_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);
+
+	area.sx = sy * vc->vc_font.height;
+	area.sy = vyres - ((sx + width) * vc->vc_font.width);
+	area.dx = dy * vc->vc_font.height;
+	area.dy = vyres - ((dx + width) * vc->vc_font.width);
+	area.width = height * vc->vc_font.height;
+	area.height  = width * vc->vc_font.width;
+
+	info->fbops->fb_copyarea(info, &area);
+}
+
+static void ccw_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);
+
+	region.color = attr_bgcol_ec(bgshift,vc);
+	region.dx = sy * vc->vc_font.height;
+	region.dy = vyres - ((sx + width) * vc->vc_font.width);
+	region.height = width * vc->vc_font.width;
+	region.width = height * vc->vc_font.height;
+	region.rop = ROP_COPY;
+
+	info->fbops->fb_fillrect(info, &region);
+}
+
+static inline void ccw_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.height + 7) >> 3;
+	u8 *src;
+
+	while (cnt--) {
+		src = ops->fontbuffer + (scr_readw(s--) & charmask)*cellsize;
+
+		if (attr) {
+			ccw_update_attr(buf, src, attr, vc);
+			src = buf;
+		}
+
+		if (likely(idx == 1))
+			__fb_pad_aligned_buffer(dst, d_pitch, src, idx,
+						vc->vc_font.width);
+		else
+			fb_pad_aligned_buffer(dst, d_pitch, src, idx,
+					      vc->vc_font.width);
+
+		dst += d_pitch * vc->vc_font.width;
+	}
+
+	info->fbops->fb_imageblit(info, image);
+}
+
+static void ccw_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.height + 7)/8;
+	u32 cellsize = width * vc->vc_font.width;
+	u32 maxcnt = info->pixmap.size/cellsize;
+	u32 scan_align = info->pixmap.scan_align - 1;
+	u32 buf_align = info->pixmap.buf_align - 1;
+	u32 cnt, pitch, size;
+	u32 attribute = get_attribute(info, scr_readw(s));
+	u8 *dst, *buf = NULL;
+	u32 vyres = GETVYRES(p->scrollmode, info);
+
+	if (!ops->fontbuffer)
+		return;
+
+	image.fg_color = fg;
+	image.bg_color = bg;
+	image.dx = yy * vc->vc_font.height;
+	image.dy = vyres - ((xx + count) * vc->vc_font.width);
+	image.width = 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.height = 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;
+		ccw_putcs_aligned(vc, info, s, attribute, cnt, pitch,
+				 width, cellsize, &image, buf, dst);
+		image.dy += image.height;
+		count -= cnt;
+		s -= 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 ccw_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.yres - (vc->vc_cols*cw);
+	unsigned int bh = info->var.xres - (vc->vc_rows*ch);
+	unsigned int bs = 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.dx = 0;
+		region.dy = info->var.yoffset;
+		region.height = rw;
+		region.width = info->var.xres_virtual;
+		info->fbops->fb_fillrect(info, &region);
+	}
+
+	if (bh) {
+		region.dx = info->var.xoffset + bs;
+		region.dy = 0;
+                region.height = info->var.yres_virtual;
+                region.width = bh;
+		info->fbops->fb_fillrect(info, &region);
+	}
+}
+
+static void ccw_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.height + 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);
+
+	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.width));
+
+	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.width, GFP_ATOMIC);
+		if (!dst)
+			return;
+		kfree(ops->cursor_data);
+		ops->cursor_data = dst;
+		ccw_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.width ||
+	    ops->cursor_state.image.width != vc->vc_font.height ||
+	    ops->cursor_reset) {
+		ops->cursor_state.image.height = vc->vc_font.width;
+		ops->cursor_state.image.width = vc->vc_font.height;
+		cursor.set |= FB_CUR_SETSIZE;
+	}
+
+	dx = y * vc->vc_font.height;
+	dy = vyres - ((vc->vc_x + 1) * 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 *tmp, *mask = kmalloc(w*vc->vc_font.width, GFP_ATOMIC);
+		int cur_height, size, i = 0;
+		int width = (vc->vc_font.width + 7)/8;
+
+		if (!mask)
+			return;
+
+		tmp = kmalloc(width * vc->vc_font.height, GFP_ATOMIC);
+
+		if (!tmp) {
+			kfree(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 = (vc->vc_font.height - cur_height) * width;
+		while (size--)
+			tmp[i++] = 0;
+		size = cur_height * width;
+		while (size--)
+			tmp[i++] = 0xff;
+		memset(mask, 0, w * vc->vc_font.width);
+		rotate_ccw(tmp, mask, vc->vc_font.width, vc->vc_font.height);
+		kfree(tmp);
+	}
+
+	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 ccw_update_start(struct fb_info *info)
+{
+	struct fbcon_ops *ops = info->fbcon_par;
+	struct display *p = &fb_display[ops->currcon];
+	u32 yoffset;
+	u32 vyres = GETVYRES(p->scrollmode, info);
+	int err;
+
+	yoffset = (vyres - info->var.yres) - ops->var.xoffset;
+	ops->var.xoffset = ops->var.yoffset;
+	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_ccw(struct fbcon_ops *ops)
+{
+	ops->bmove = ccw_bmove;
+	ops->clear = ccw_clear;
+	ops->putcs = ccw_putcs;
+	ops->clear_margins = ccw_clear_margins;
+	ops->cursor = ccw_cursor;
+	ops->update_start = ccw_update_start;
+}
+EXPORT_SYMBOL(fbcon_rotate_ccw);
+
+MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
+MODULE_DESCRIPTION("Console Rotation (270 degrees) Support");
+MODULE_LICENSE("GPL");