1/*	$NetBSD: bt_subr.c,v 1.5.6.4 2005/01/24 08:34:47 skrll Exp $ */
2
3/*
4 * Copyright (c) 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
10 *
11 * All advertising materials mentioning features or use of this software
12 * must display the following acknowledgement:
13 *	This product includes software developed by the University of
14 *	California, Lawrence Berkeley Laboratory.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 *    notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 *    notice, this list of conditions and the following disclaimer in the
23 *    documentation and/or other materials provided with the distribution.
24 * 3. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 *	@(#)bt_subr.c	8.2 (Berkeley) 1/21/94
41 */
42
43#include <sys/cdefs.h>
44__KERNEL_RCSID(0, "$NetBSD: bt_subr.c,v 1.5.6.4 2005/01/24 08:34:47 skrll Exp $");
45
46#include <sys/param.h>
47#include <sys/buf.h>
48#include <sys/errno.h>
49
50#include <dev/sun/fbio.h>
51
52#include "btreg.h"
53#include "btvar.h"
54
55/*
56 * Common code for dealing with Brooktree video DACs.
57 * (Contains some software-only code as well, since the colormap
58 * ioctls are shared between the cgthree and cgsix drivers.)
59 */
60
61/*
62 * Implement an FBIOGETCMAP-like ioctl.
63 */
64int
65bt_getcmap(struct fbcmap *p, union bt_cmap *cm, int cmsize)
66{
67	u_int i, start, count;
68	u_char *cp;
69
70	start = p->index;
71	count = p->count;
72	if (start >= cmsize || count > cmsize - start)
73		return (EINVAL);
74	if (!useracc(p->red, count, B_WRITE) ||
75	    !useracc(p->green, count, B_WRITE) ||
76	    !useracc(p->blue, count, B_WRITE))
77		return (EFAULT);
78	for (cp = &cm->cm_map[start][0], i = 0; i < count; cp += 3, i++) {
79		p->red[i] = cp[0];
80		p->green[i] = cp[1];
81		p->blue[i] = cp[2];
82	}
83	return (0);
84}
85
86/*
87 * Implement the software portion of an FBIOPUTCMAP-like ioctl.
88 */
89int
90bt_putcmap(struct fbcmap *p, union bt_cmap *cm, int cmsize)
91{
92	u_int i, start, count;
93	u_char *cp;
94
95	start = p->index;
96	count = p->count;
97	if (start >= cmsize || count > cmsize - start)
98		return (EINVAL);
99	if (!useracc(p->red, count, B_READ) ||
100	    !useracc(p->green, count, B_READ) ||
101	    !useracc(p->blue, count, B_READ))
102		return (EFAULT);
103	for (cp = &cm->cm_map[start][0], i = 0; i < count; cp += 3, i++) {
104		cp[0] = p->red[i];
105		cp[1] = p->green[i];
106		cp[2] = p->blue[i];
107	}
108	return (0);
109}
110