xref: /freebsd/sys/dev/iicbus/iicbb_if.m (revision 38f0b757fd84d17d0fc24739a7cda160c4516d81) 
1#-
2# Copyright (c) 1998 Nicolas Souchu
3# All rights reserved.
4#
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions
7# are met:
8# 1. Redistributions of source code must retain the above copyright
9#    notice, this list of conditions and the following disclaimer.
10# 2. Redistributions in binary form must reproduce the above copyright
11#    notice, this list of conditions and the following disclaimer in the
12#    documentation and/or other materials provided with the distribution.
13#
14# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24# SUCH DAMAGE.
25#
26# $FreeBSD$
27#
28
29#include <sys/bus.h>
30
31INTERFACE iicbb;
32
33#
34# Default implementation of optional methods
35#
36CODE {
37	static int
38	null_pre_xfer(device_t dev)
39	{
40		return 0;
41	}
42
43	static void
44	null_post_xfer(device_t dev)
45
46	{
47	}
48
49	static int
50	null_callback(device_t dev, int index, caddr_t data)
51	{
52		return 0;
53	}
54};
55
56#
57# iicbus callback
58#
59METHOD int callback {
60	device_t dev;
61	int index;
62	caddr_t data;
63} DEFAULT null_callback;
64
65#
66# Prepare device for I2C transfer
67#
68METHOD int pre_xfer {
69	device_t dev;
70} DEFAULT null_pre_xfer;
71
72#
73# Cleanup device after I2C transfer
74#
75METHOD void post_xfer {
76	device_t dev;
77} DEFAULT null_post_xfer;
78
79#
80# Set I2C bus data line
81#
82METHOD void setsda {
83	device_t dev;
84	int val;
85};
86
87#
88# Set I2C bus clock line
89#
90METHOD void setscl {
91	device_t dev;
92	int val;
93};
94
95#
96# Get I2C bus data line
97#
98#
99METHOD int getsda {
100	device_t dev;
101};
102
103#
104# Get I2C bus clock line
105#
106#
107METHOD int getscl {
108	device_t dev;
109};
110
111#
112# Reset interface
113#
114METHOD int reset {
115	device_t dev;
116	u_char speed;
117	u_char addr;
118	u_char *oldaddr;
119};
120