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
fbcon_rotate_font(struct fb_info * info,struct vc_data * vc)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 = vc->vc_font.charcount;
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
92 finished:
93 return err;
94 }
95
fbcon_set_rotate(struct fbcon_ops * ops)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