drivers/video/console/fbcon_rotate.c

   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/string.h>
  13 #include <linux/fb.h>
  14 #include <linux/vt_kern.h>
  15 #include <linux/console.h>
  16 #include <asm/types.h>
  17 #include "fbcon.h"
  18 #include "fbcon_rotate.h"
  19
  20 static int fbcon_rotate_font(struct fb_info *info, struct vc_data *vc)
  21 {
  22         struct fbcon_ops *ops = info->fbcon_par;
  23         int len, err = 0;
  24         int s_cellsize, d_cellsize, i;
  25         const u8 *src;
  26         u8 *dst;
  27
  28         if (vc->vc_font.data == ops->fontdata &&
  29             ops->p->con_rotate == ops->cur_rotate)
  30                 goto finished;
  31
  32         src = ops->fontdata = vc->vc_font.data;
  33         ops->cur_rotate = ops->p->con_rotate;
  34         len = (!ops->p->userfont) ? 256 : FNTCHARCNT(src);
  35         s_cellsize = ((vc->vc_font.width + 7)/8) *
  36                 vc->vc_font.height;
  37         d_cellsize = s_cellsize;
  38
  39         if (ops->rotate == FB_ROTATE_CW ||
  40             ops->rotate == FB_ROTATE_CCW)
  41                 d_cellsize = ((vc->vc_font.height + 7)/8) *
  42                         vc->vc_font.width;
  43
  44         if (info->fbops->fb_sync)
  45                 info->fbops->fb_sync(info);
  46
  47         if (ops->fd_size < d_cellsize * len) {
  48                 dst = kmalloc(d_cellsize * len, GFP_KERNEL);
  49
  50                 if (dst == NULL) {
  51                         err = -ENOMEM;
  52                         goto finished;
  53                 }
  54
  55                 ops->fd_size = d_cellsize * len;
  56                 kfree(ops->fontbuffer);
  57                 ops->fontbuffer = dst;
  58         }
  59
  60         dst = ops->fontbuffer;
  61         memset(dst, 0, ops->fd_size);
  62
  63         switch (ops->rotate) {
  64         case FB_ROTATE_UD:
  65                 for (i = len; i--; ) {
  66                         rotate_ud(src, dst, vc->vc_font.width,
  67                                   vc->vc_font.height);
  68
  69                         src += s_cellsize;
  70                         dst += d_cellsize;
  71                 }
  72                 break;
  73         case FB_ROTATE_CW:
  74                 for (i = len; i--; ) {
  75                         rotate_cw(src, dst, vc->vc_font.width,
  76                                   vc->vc_font.height);
  77                         src += s_cellsize;
  78                         dst += d_cellsize;
  79                 }
  80                 break;
  81         case FB_ROTATE_CCW:
  82                 for (i = len; i--; ) {
  83                         rotate_ccw(src, dst, vc->vc_font.width,
  84                                    vc->vc_font.height);
  85                         src += s_cellsize;
  86                         dst += d_cellsize;
  87                 }
  88                 break;
  89         }
  90
  91 finished:
  92         return err;
  93 }
  94
  95 void fbcon_set_rotate(struct fbcon_ops *ops)
  96 {
  97         ops->rotate_font = fbcon_rotate_font;
  98
  99         switch(ops->rotate) {
 100         case FB_ROTATE_CW:
 101                 fbcon_rotate_cw(ops);
 102                 break;
 103         case FB_ROTATE_UD:
 104                 fbcon_rotate_ud(ops);
 105                 break;
 106         case FB_ROTATE_CCW:
 107                 fbcon_rotate_ccw(ops);
 108                 break;
 109         }
 110 }
 111 EXPORT_SYMBOL(fbcon_set_rotate);
 112
 113 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
 114 MODULE_DESCRIPTION("Console Rotation Support");
 115 MODULE_LICENSE("GPL");