linux/Documentation/hwmon/adm1025
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   1Kernel driver adm1025
   2=====================
   3
   4Supported 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
  14The 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
  19Authors:
  20        Chen-Yuan Wu <gwu@esoft.com>,
  21        Jean Delvare <khali@linux-fr.org>
  22
  23Description
  24-----------
  25
  26(This is from Analog Devices.) The ADM1025 is a complete system hardware
  27monitor for microprocessor-based systems, providing measurement and limit
  28comparison of various system parameters. Five voltage measurement inputs
  29are provided, for monitoring +2.5V, +3.3V, +5V and +12V power supplies and
  30the processor core voltage. The ADM1025 can monitor a sixth power-supply
  31voltage by measuring its own VCC. One input (two pins) is dedicated to a
  32remote temperature-sensing diode and an on-chip temperature sensor allows
  33ambient temperature to be monitored.
  34
  35One specificity of this chip is that the pin 11 can be hardwired in two
  36different manners. It can act as the +12V power-supply voltage analog
  37input, or as the a fifth digital entry for the VID reading (bit 4). It's
  38kind of strange since both are useful, and the reason for designing the
  39chip that way is obscure at least to me. The bit 5 of the configuration
  40register can be used to define how the chip is hardwired. Please note that
  41it is not a choice you have to make as the user. The choice was already
  42made by your motherboard's maker. If the configuration bit isn't set
  43properly, you'll have a wrong +12V reading or a wrong VID reading. The way
  44the driver handles that is to preserve this bit through the initialization
  45process, assuming that the BIOS set it up properly beforehand. If it turns
  46out not to be true in some cases, we'll provide a module parameter to force
  47modes.
  48
  49This driver also supports the ADM1025A, which differs from the ADM1025
  50only in that it has "open-drain VID inputs while the ADM1025 has on-chip
  51100k pull-ups on the VID inputs". It doesn't make any difference for us.
  52
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