FreeBSD/Linux Kernel Cross Reference
sys/dev/i2c/lm75reg.h
1 /* $NetBSD: lm75reg.h,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 2003 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 #ifndef _DEV_I2C_LM75REG_H_
39 #define _DEV_I2C_LM75REG_H_
40
41 /*
42 * LM75 temperature sensor I2C address:
43 *
44 * 100 1xxx
45 */
46 #define LM75_ADDRMASK 0x78
47 #define LM75_ADDR 0x48
48
49 /*
50 * Temperature on the LM75 is represented by a 9-bit two's complement
51 * integer in steps of 0.5C. The following examples are taken from
52 * the LM75 data sheet:
53 *
54 * +125C 0 1111 1010 0x0fa
55 * +25C 0 0011 0010 0x032
56 * +0.5C 0 0000 0001 0x001
57 * 0C 0 0000 0000 0x000
58 * -0.5C 1 1111 1111 0x1ff
59 * -25C 1 1100 1110 0x1ce
60 * -55C 1 1001 0010 0x192
61 */
62
63 #define LM75_REG_TEMP 0x00
64 #define LM75_REG_CONFIG 0x01
65 #define LM75_REG_THYST_SET_POINT 0x02
66 #define LM75_REG_TOS_SET_POINT 0x03
67
68 #define LM75_TEMP_LEN 2 /* 2 data bytes */
69
70 #define LM75_CONFIG_SHUTDOWN 0x01
71 #define LM75_CONFIG_CMPINT 0x02
72 #define LM75_CONFIG_OSPOLARITY 0x04
73 #define LM75_CONFIG_FAULT_QUEUE_1 (0 << 3)
74 #define LM75_CONFIG_FAULT_QUEUE_2 (1 << 3)
75 #define LM75_CONFIG_FAULT_QUEUE_4 (2 << 3)
76 #define LM75_CONFIG_FAULT_QUEUE_6 (3 << 3)
77
78 #endif /* _DEV_I2C_LM75REG_H_ */
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