xref: /freebsd/sys/dev/smbus/smb.h (revision 59c8e88e72633afbc47a4ace0d2170d00d51f7dc)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 1998 Nicolas Souchu
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  *
28  */
29 #ifndef __SMB_H
30 #define __SMB_H
31 
32 #include <sys/ioccom.h>
33 
34 struct smbcmd {
35 	u_char cmd;
36 	u_char reserved;
37 	u_short op;
38 	union {
39 		char	byte;
40 		char	buf[2];
41 		short	word;
42 	} wdata;
43 	union {
44 		char	byte;
45 		char	buf[2];
46 		short	word;
47 	} rdata;
48 	int  slave;
49 	char *wbuf;	/* use wdata if NULL */
50 	int  wcount;
51 	char *rbuf;	/* use rdata if NULL */
52 	int  rcount;
53 };
54 
55 /*
56  * SMBus spec 2.0 says block transfers may be at most 32 bytes.
57  */
58 #define SMB_MAXBLOCKSIZE	32
59 
60 #define SMB_QUICK_WRITE	_IOW('i', 1, struct smbcmd)
61 #define SMB_QUICK_READ	_IOW('i', 2, struct smbcmd)
62 #define SMB_SENDB	_IOW('i', 3, struct smbcmd)
63 #define SMB_RECVB	_IOWR('i', 4, struct smbcmd)
64 #define SMB_WRITEB	_IOW('i', 5, struct smbcmd)
65 #define SMB_WRITEW	_IOW('i', 6, struct smbcmd)
66 #define SMB_READB	_IOWR('i', 7, struct smbcmd)
67 #define SMB_READW	_IOWR('i', 8, struct smbcmd)
68 #define SMB_PCALL	_IOWR('i', 9, struct smbcmd)
69 #define SMB_BWRITE	_IOW('i', 10, struct smbcmd)
70 #define SMB_BREAD	_IOWR('i', 11, struct smbcmd)
71 #define SMB_OLD_TRANS	_IOWR('i', 12, struct smbcmd)
72 
73 #endif
74