Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
fbcon_rotate.c
Go to the documentation of this file.
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 
21 static 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(d_cellsize * len, 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 
92 finished:
93  return err;
94 }
95 
96 void 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 }
113 
114 MODULE_AUTHOR("Antonino Daplas <[email protected]>");
115 MODULE_DESCRIPTION("Console Rotation Support");
116 MODULE_LICENSE("GPL");