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