xref: /freebsd/sys/dev/iicbus/iicbus_if.m (revision fcb560670601b2a4d87bb31d7531c8dcc37ee71b) 
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#include <dev/iicbus/iic.h>
31
32INTERFACE iicbus;
33
34CODE {
35	static u_int
36	iicbus_default_frequency(device_t bus, u_char speed)
37	{
38
39		return (100000);
40	}
41};
42
43#
44# Interpret interrupt
45#
46METHOD int intr {
47	device_t dev;
48	int event;
49	char *buf;
50};
51
52#
53# iicbus callback
54#
55METHOD int callback {
56	device_t dev;
57	int index;
58	caddr_t data;
59};
60
61#
62# Send REPEATED_START condition
63#
64METHOD int repeated_start {
65	device_t dev;
66	u_char slave;
67	int timeout;
68};
69
70#
71# Send START condition
72#
73METHOD int start {
74	device_t dev;
75	u_char slave;
76	int timeout;
77};
78
79#
80# Send STOP condition
81#
82METHOD int stop {
83	device_t dev;
84};
85
86#
87# Read from I2C bus
88#
89METHOD int read {
90	device_t dev;
91	char *buf;
92	int len;
93	int *bytes;
94	int last;
95	int delay;
96};
97
98#
99# Write to the I2C bus
100#
101METHOD int write {
102	device_t dev;
103	const char *buf;
104	int len;
105	int *bytes;
106	int timeout;
107};
108
109#
110# Reset I2C bus
111#
112METHOD int reset {
113	device_t dev;
114	u_char speed;
115	u_char addr;
116	u_char *oldaddr;
117};
118
119#
120# Generalized Read/Write interface
121#
122METHOD int transfer {
123	device_t dev;
124	struct iic_msg *msgs;
125	uint32_t nmsgs;
126};
127
128#
129# Return the frequency in Hz for the bus running at the given
130# symbolic speed.  Only the IIC_SLOW speed has meaning, it is always
131# 100KHz.  The UNKNOWN, FAST, and FASTEST rates all map to the
132# configured bus frequency, or 100KHz when not otherwise configured.
133#
134METHOD u_int get_frequency {
135	device_t dev;
136	u_char speed;
137} DEFAULT iicbus_default_frequency;
138