1 Kernel driver adm1025 1 Kernel driver adm1025
2 ===================== 2 =====================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * Analog Devices ADM1025, ADM1025A 6 * Analog Devices ADM1025, ADM1025A
7 7
8 Prefix: 'adm1025' 8 Prefix: 'adm1025'
9 9
10 Addresses scanned: I2C 0x2c - 0x2e 10 Addresses scanned: I2C 0x2c - 0x2e
11 11
12 Datasheet: Publicly available at the Analo 12 Datasheet: Publicly available at the Analog Devices website
13 13
14 * Philips NE1619 14 * Philips NE1619
15 15
16 Prefix: 'ne1619' 16 Prefix: 'ne1619'
17 17
18 Addresses scanned: I2C 0x2c - 0x2d 18 Addresses scanned: I2C 0x2c - 0x2d
19 19
20 Datasheet: Publicly available at the Phili 20 Datasheet: Publicly available at the Philips website
21 21
22 The NE1619 presents some differences with the 22 The NE1619 presents some differences with the original ADM1025:
23 23
24 * Only two possible addresses (0x2c - 0x2d). 24 * Only two possible addresses (0x2c - 0x2d).
25 * No temperature offset register, but we don 25 * No temperature offset register, but we don't use it anyway.
26 * No INT mode for pin 16. We don't play with 26 * No INT mode for pin 16. We don't play with it anyway.
27 27
28 Authors: 28 Authors:
29 - Chen-Yuan Wu <gwu@esoft.com>, 29 - Chen-Yuan Wu <gwu@esoft.com>,
30 - Jean Delvare <jdelvare@suse.de> 30 - Jean Delvare <jdelvare@suse.de>
31 31
32 Description 32 Description
33 ----------- 33 -----------
34 34
35 (This is from Analog Devices.) The ADM1025 is 35 (This is from Analog Devices.) The ADM1025 is a complete system hardware
36 monitor for microprocessor-based systems, prov 36 monitor for microprocessor-based systems, providing measurement and limit
37 comparison of various system parameters. Five 37 comparison of various system parameters. Five voltage measurement inputs
38 are provided, for monitoring +2.5V, +3.3V, +5V 38 are provided, for monitoring +2.5V, +3.3V, +5V and +12V power supplies and
39 the processor core voltage. The ADM1025 can mo 39 the processor core voltage. The ADM1025 can monitor a sixth power-supply
40 voltage by measuring its own VCC. One input (t 40 voltage by measuring its own VCC. One input (two pins) is dedicated to a
41 remote temperature-sensing diode and an on-chi 41 remote temperature-sensing diode and an on-chip temperature sensor allows
42 ambient temperature to be monitored. 42 ambient temperature to be monitored.
43 43
44 One specificity of this chip is that the pin 1 44 One specificity of this chip is that the pin 11 can be hardwired in two
45 different manners. It can act as the +12V powe 45 different manners. It can act as the +12V power-supply voltage analog
46 input, or as the a fifth digital entry for the 46 input, or as the a fifth digital entry for the VID reading (bit 4). It's
47 kind of strange since both are useful, and the 47 kind of strange since both are useful, and the reason for designing the
48 chip that way is obscure at least to me. The b 48 chip that way is obscure at least to me. The bit 5 of the configuration
49 register can be used to define how the chip is 49 register can be used to define how the chip is hardwired. Please note that
50 it is not a choice you have to make as the use 50 it is not a choice you have to make as the user. The choice was already
51 made by your motherboard's maker. If the confi 51 made by your motherboard's maker. If the configuration bit isn't set
52 properly, you'll have a wrong +12V reading or 52 properly, you'll have a wrong +12V reading or a wrong VID reading. The way
53 the driver handles that is to preserve this bi 53 the driver handles that is to preserve this bit through the initialization
54 process, assuming that the BIOS set it up prop 54 process, assuming that the BIOS set it up properly beforehand. If it turns
55 out not to be true in some cases, we'll provid 55 out not to be true in some cases, we'll provide a module parameter to force
56 modes. 56 modes.
57 57
58 This driver also supports the ADM1025A, which 58 This driver also supports the ADM1025A, which differs from the ADM1025
59 only in that it has "open-drain VID inputs whi 59 only in that it has "open-drain VID inputs while the ADM1025 has on-chip
60 100k pull-ups on the VID inputs". It doesn't m 60 100k pull-ups on the VID inputs". It doesn't make any difference for us.
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