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
32 INTERFACE iicbus;
33
34 CODE {
35 static int iicbus_nosupport(void)
36 {
37
38 return (ENODEV);
39 }
40
41 static u_int
42 iicbus_default_frequency(device_t bus, u_char speed)
43 {
44
45 return (100000);
46 }
47 };
48
49 #
50 # Interpret interrupt
51 #
52 METHOD int intr {
53 device_t dev;
54 int event;
55 char *buf;
56 };
57
58 #
59 # iicbus callback
60 # Request ownership of bus
61 # index: IIC_REQUEST_BUS or IIC_RELEASE_BUS
62 # data: pointer to int containing IIC_WAIT or IIC_DONTWAIT and either IIC_INTR or IIC_NOINTR
63 # This function is allowed to sleep if *data contains IIC_WAIT.
64 #
65 METHOD int callback {
66 device_t dev;
67 int index;
68 caddr_t data;
69 };
70
71 #
72 # Send REPEATED_START condition
73 #
74 METHOD int repeated_start {
75 device_t dev;
76 u_char slave;
77 int timeout;
78 } DEFAULT iicbus_nosupport;
79
80 #
81 # Send START condition
82 #
83 METHOD int start {
84 device_t dev;
85 u_char slave;
86 int timeout;
87 } DEFAULT iicbus_nosupport;
88
89 #
90 # Send STOP condition
91 #
92 METHOD int stop {
93 device_t dev;
94 } DEFAULT iicbus_nosupport;
95
96 #
97 # Read from I2C bus
98 #
99 METHOD int read {
100 device_t dev;
101 char *buf;
102 int len;
103 int *bytes;
104 int last;
105 int delay;
106 } DEFAULT iicbus_nosupport;
107
108 #
109 # Write to the I2C bus
110 #
111 METHOD int write {
112 device_t dev;
113 const char *buf;
114 int len;
115 int *bytes;
116 int timeout;
117 } DEFAULT iicbus_nosupport;
118
119 #
120 # Reset I2C bus
121 #
122 METHOD int reset {
123 device_t dev;
124 u_char speed;
125 u_char addr;
126 u_char *oldaddr;
127 };
128
129 #
130 # Generalized Read/Write interface
131 #
132 METHOD int transfer {
133 device_t dev;
134 struct iic_msg *msgs;
135 uint32_t nmsgs;
136 };
137
138 #
139 # Return the frequency in Hz for the bus running at the given
140 # symbolic speed. Only the IIC_SLOW speed has meaning, it is always
141 # 100KHz. The UNKNOWN, FAST, and FASTEST rates all map to the
142 # configured bus frequency, or 100KHz when not otherwise configured.
143 #
144 METHOD u_int get_frequency {
145 device_t dev;
146 u_char speed;
147 } DEFAULT iicbus_default_frequency;
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