LXR linux/drivers/video/fbdev/core/fbcon

   1/*
   2 *  linux/drivers/video/console/fbcon_rotate.c -- Software Rotation
   3 *
   4 *      Copyright (C) 2005 Antonino Daplas <adaplas @pol.net>
   5 *
   6 *  This file is subject to the terms and conditions of the GNU General Public
   7 *  License.  See the file COPYING in the main directory of this archive for
   8 *  more details.
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/slab.h>
  13#include <linux/string.h>
  14#include <linux/fb.h>
  15#include <linux/vt_kern.h>
  16#include <linux/console.h>
  17#include <asm/types.h>
  18#include "fbcon.h"
  19#include "fbcon_rotate.h"
  20
  21static int fbcon_rotate_font(struct fb_info *info, struct vc_data *vc)
  22{
  23        struct fbcon_ops *ops = info->fbcon_par;
  24        int len, err = 0;
  25        int s_cellsize, d_cellsize, i;
  26        const u8 *src;
  27        u8 *dst;
  28
  29        if (vc->vc_font.data == ops->fontdata &&
  30            ops->p->con_rotate == ops->cur_rotate)
  31                goto finished;
  32
  33        src = ops->fontdata = vc->vc_font.data;
  34        ops->cur_rotate = ops->p->con_rotate;
  35        len = (!ops->p->userfont) ? 256 : FNTCHARCNT(src);
  36        s_cellsize = ((vc->vc_font.width + 7)/8) *
  37                vc->vc_font.height;
  38        d_cellsize = s_cellsize;
  39
  40        if (ops->rotate == FB_ROTATE_CW ||
  41            ops->rotate == FB_ROTATE_CCW)
  42                d_cellsize = ((vc->vc_font.height + 7)/8) *
  43                        vc->vc_font.width;
  44
  45        if (info->fbops->fb_sync)
  46                info->fbops->fb_sync(info);
  47
  48        if (ops->fd_size < d_cellsize * len) {
  49                dst = kmalloc_array(len, d_cellsize, GFP_KERNEL);
  50
  51                if (dst == NULL) {
  52                        err = -ENOMEM;
  53                        goto finished;
  54                }
  55
  56                ops->fd_size = d_cellsize * len;
  57                kfree(ops->fontbuffer);
  58                ops->fontbuffer = dst;
  59        }
  60
  61        dst = ops->fontbuffer;
  62        memset(dst, 0, ops->fd_size);
  63
  64        switch (ops->rotate) {
  65        case FB_ROTATE_UD:
  66                for (i = len; i--; ) {
  67                        rotate_ud(src, dst, vc->vc_font.width,
  68                                  vc->vc_font.height);
  69
  70                        src += s_cellsize;
  71                        dst += d_cellsize;
  72                }
  73                break;
  74        case FB_ROTATE_CW:
  75                for (i = len; i--; ) {
  76                        rotate_cw(src, dst, vc->vc_font.width,
  77                                  vc->vc_font.height);
  78                        src += s_cellsize;
  79                        dst += d_cellsize;
  80                }
  81                break;
  82        case FB_ROTATE_CCW:
  83                for (i = len; i--; ) {
  84                        rotate_ccw(src, dst, vc->vc_font.width,
  85                                   vc->vc_font.height);
  86                        src += s_cellsize;
  87                        dst += d_cellsize;
  88                }
  89                break;
  90        }
  91
  92finished:
  93        return err;
  94}
  95
  96void fbcon_set_rotate(struct fbcon_ops *ops)
  97{
  98        ops->rotate_font = fbcon_rotate_font;
  99
 100        switch(ops->rotate) {
 101        case FB_ROTATE_CW:
 102                fbcon_rotate_cw(ops);
 103                break;
 104        case FB_ROTATE_UD:
 105                fbcon_rotate_ud(ops);
 106                break;
 107        case FB_ROTATE_CCW:
 108                fbcon_rotate_ccw(ops);
 109                break;
 110        }
 111}
 112EXPORT_SYMBOL(fbcon_set_rotate);
 113