| 1 |
62 |
marcus.erl |
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 ,
|
| 21 |
|
|
Jean Delvare
|
| 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.
|
