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