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