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
20static 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
91finished:
92	return err;
93}
94
95void 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}
111EXPORT_SYMBOL(fbcon_set_rotate);
112
113MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
114MODULE_DESCRIPTION("Console Rotation Support");
115MODULE_LICENSE("GPL");
116