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hwmon: (adt7475) Add support for the ADT7490

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Add support for the Analog Devices ADT7490 chip. This chip is largely
compatible with the ADT7473 and ADT7475, with additional features.
In particular, it has 6 voltage inputs instead of 2.

Signed-off-by: Jean Delvare <[email protected]>
Cc: Hans de Goede <[email protected]>
Cc: Jordan Crouse <[email protected]>
Cc: "Darrick J. Wong" <[email protected]>
This commit is contained in:
Jean Delvare 2009-12-09 20:36:05 +01:00
commit 3d84998171
3 changed files with 134 additions and 19 deletions
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34
Documentation/hwmon/adt7475
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@ -10,24 +10,31 @@ Supported chips:
Prefix: 'adt7475'
Addresses scanned: I2C 0x2E
Datasheet: Publicly available at the On Semiconductors website
* Analog Devices ADT7490
Prefix: 'adt7490'
Addresses scanned: I2C 0x2C, 0x2D, 0x2E
Datasheet: Publicly available at the On Semiconductors website
Authors:
Jordan Crouse
Hans de Goede
Darrick J. Wong (documentation)
Jean Delvare
Description
-----------
This driver implements support for the Analog Devices ADT7473 and ADT7475
chip family. Both chips differ only in minor details. They will be
collectively designed by the name "ADT747x" in the rest of this document.
This driver implements support for the Analog Devices ADT7473, ADT7475 and
ADT7490 chip family. The ADT7473 and ADT7475 differ only in minor details.
The ADT7490 has additional features, including extra voltage measurement
inputs and PECI support. All the supported chips will be collectively
designed by the name "ADT747x" in the rest of this document.
The ADT747x uses the 2-wire interface compatible with the SMBus 2.0
specification. Using an analog to digital converter it measures three (3)
temperatures and two (2) voltages. It has four (4) 16-bit counters for
measuring fan speed. There are three (3) PWM outputs that can be used
temperatures and two (2) or more voltages. It has four (4) 16-bit counters
for measuring fan speed. There are three (3) PWM outputs that can be used
to control fan speed.
A sophisticated control system for the PWM outputs is designed into the
@ -45,6 +52,23 @@ The ADT747x samples all inputs continuously. The driver will not read
the registers more often than once every other second. Further,
configuration data is only read once per minute.
Chip Differences Summary
------------------------
ADT7473:
* 2 voltage inputs
* system acoustics optimizations (not implemented)
ADT7475:
* 2 voltage inputs
ADT7490:
* 6 voltage inputs
* 1 Imon input (not implemented)
* PECI support (not implemented)
* 2 GPIO pins (not implemented)
* system acoustics optimizations (not implemented)
Special Features
----------------