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/*

 *  linux/drivers/video/console/fbcon_rotate.c -- Software Rotation

 *

 *      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/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"

static int fbcon_rotate_font(struct fb_info *info, struct vc_data *vc)

{

        struct fbcon_ops *ops = info->fbcon_par;

        int len, err = 0;

        int s_cellsize, d_cellsize, i;

        const u8 *src;

        u8 *dst;

        if (vc->vc_font.data == ops->fontdata &&

            ops->p->con_rotate == ops->cur_rotate)

                goto finished;

        src = ops->fontdata = vc->vc_font.data;

        ops->cur_rotate = ops->p->con_rotate;

        len = (!ops->p->userfont) ? 256 : FNTCHARCNT(src);

        s_cellsize = ((vc->vc_font.width + 7)/8) *

                vc->vc_font.height;

        d_cellsize = s_cellsize;

        if (ops->rotate == FB_ROTATE_CW ||

            ops->rotate == FB_ROTATE_CCW)

                d_cellsize = ((vc->vc_font.height + 7)/8) *

                        vc->vc_font.width;

        if (info->fbops->fb_sync)

                info->fbops->fb_sync(info);

        if (ops->fd_size < d_cellsize * len) {

                dst = kmalloc(d_cellsize * len, GFP_KERNEL);

                if (dst == NULL) {

                        err = -ENOMEM;

                        goto finished;

                }

                ops->fd_size = d_cellsize * len;

                kfree(ops->fontbuffer);

                ops->fontbuffer = dst;

        }

        dst = ops->fontbuffer;

        memset(dst, 0, ops->fd_size);

        switch (ops->rotate) {

        case FB_ROTATE_UD:

                for (i = len; i--; ) {

                        rotate_ud(src, dst, vc->vc_font.width,

                                  vc->vc_font.height);

                        src += s_cellsize;

                        dst += d_cellsize;

                }

                break;

        case FB_ROTATE_CW:

                for (i = len; i--; ) {

                        rotate_cw(src, dst, vc->vc_font.width,

                                  vc->vc_font.height);

                        src += s_cellsize;

                        dst += d_cellsize;

                }

                break;

        case FB_ROTATE_CCW:

                for (i = len; i--; ) {

                        rotate_ccw(src, dst, vc->vc_font.width,

                                   vc->vc_font.height);

                        src += s_cellsize;

                        dst += d_cellsize;

                }

                break;

        }

finished:

        return err;

}

void fbcon_set_rotate(struct fbcon_ops *ops)

{

        ops->rotate_font = fbcon_rotate_font;

        switch(ops->rotate) {

        case FB_ROTATE_CW:

                fbcon_rotate_cw(ops);

                break;

        case FB_ROTATE_UD:

                fbcon_rotate_ud(ops);

                break;

        case FB_ROTATE_CCW:

                fbcon_rotate_ccw(ops);

                break;

        }

}

EXPORT_SYMBOL(fbcon_set_rotate);

MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");

MODULE_DESCRIPTION("Console Rotation Support");

MODULE_LICENSE("GPL");