intelfb: add support for i945G
[linux-2.6] / 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/config.h>
12 #include <linux/module.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 }
112 EXPORT_SYMBOL(fbcon_set_rotate);
113
114 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
115 MODULE_DESCRIPTION("Console Rotation Support");
116 MODULE_LICENSE("GPL");