[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>

4 files changed, 434 insertions, 1 deletions

diff --git a/drivers/video/console/Makefile b/drivers/video/console/Makefile
index 830ff46e0d1a..fed600c9ca55 100644
--- a/drivers/video/console/Makefile
+++ b/drivers/video/console/Makefile
@@ -32,7 +32,8 @@ 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 fbcon_ud.o
+obj-$(CONFIG_FRAMEBUFFER_CONSOLE)     += fbcon_rotate.o fbcon_cw.o fbcon_ud.o \
+                                         fbcon_ccw.o
 endif
 
 obj-$(CONFIG_FB_STI)              += sticore.o font.o
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");
diff --git a/drivers/video/console/fbcon_rotate.c b/drivers/video/console/fbcon_rotate.c
index 3d64ad190ff8..ec0dd8fe241c 100644
--- a/drivers/video/console/fbcon_rotate.c
+++ b/drivers/video/console/fbcon_rotate.c
@@ -105,6 +105,9 @@ void fbcon_set_rotate(struct fbcon_ops *ops)
         case FB_ROTATE_UD:
                 fbcon_rotate_ud(ops);
                 break;
+        case FB_ROTATE_CCW:
+                fbcon_rotate_ccw(ops);
+                break;
         }
 }
 EXPORT_SYMBOL(fbcon_set_rotate);
diff --git a/drivers/video/console/fbcon_rotate.h b/drivers/video/console/fbcon_rotate.h
index f8ddcd6bd89c..90c672096c2e 100644
--- a/drivers/video/console/fbcon_rotate.h
+++ b/drivers/video/console/fbcon_rotate.h
@@ -101,4 +101,5 @@ static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
 
 extern void fbcon_rotate_cw(struct fbcon_ops *ops);
 extern void fbcon_rotate_ud(struct fbcon_ops *ops);
+extern void fbcon_rotate_ccw(struct fbcon_ops *ops);
 #endif