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Commit cd4e96c5 authored by Andre Prendel's avatar Andre Prendel Committed by Jean Delvare
Browse files

hwmon: (tmp401) Add documentation 



Documentation for the tmp401 driver.

The documentation describes the tmp401 driver and the supported Texas
Instruments TMP401 and TMP411 temperature sensor chips.

Further documentation for new sysfs attributes supported by this
driver is added to Documentation/hwmon/sysfs-interface.

Signed-off-by: default avatarAndre Prendel <andre.prendel@gmx.de>
Acked-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent fce0758f

Documentation/hwmon/sysfs-interface

+19 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ are interpreted as 0! For more on how written strings are interpreted see the 
[0-*]	denotes any positive number starting from 0

[1-*]	denotes any positive number starting from 1

RO	read only value

WO	write only value

RW	read/write value



Read/write values may be read-only for some chips, depending on the
@@ -295,6 +296,24 @@ temp[1-*]_label Suggested temperature channel label. 
		user-space.

		RO



temp[1-*]_lowest

		Historical minimum temperature

		Unit: millidegree Celsius

		RO



temp[1-*]_highest

		Historical maximum temperature

		Unit: millidegree Celsius

		RO



temp[1-*]_reset_history

		Reset temp_lowest and temp_highest

		WO



temp_reset_history

		Reset temp_lowest and temp_highest for all sensors

		WO



Some chips measure temperature using external thermistors and an ADC, and

report the temperature measurement as a voltage. Converting this voltage

back to a temperature (or the other way around for limits) requires

Documentation/hwmon/tmp401

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+42 −0
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Kernel driver tmp401

====================



Supported chips:

  * Texas Instruments TMP401

    Prefix: 'tmp401'

    Addresses scanned: I2C 0x4c

    Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp401.html

  * Texas Instruments TMP411

    Prefix: 'tmp411'

    Addresses scanned: I2C 0x4c

    Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp411.html



Authors:

         Hans de Goede <hdegoede@redhat.com>

	 Andre Prendel <andre.prendel@gmx.de>



Description

-----------



This driver implements support for Texas Instruments TMP401 and

TMP411 chips. These chips implements one remote and one local

temperature sensor. Temperature is measured in degrees

Celsius. Resolution of the remote sensor is 0.0625 degree. Local

sensor resolution can be set to 0.5, 0.25, 0.125 or 0.0625 degree (not

supported by the driver so far, so using the default resolution of 0.5

degree).



The driver provides the common sysfs-interface for temperatures (see

/Documentation/hwmon/sysfs-interface under Temperatures).



The TMP411 chip is compatible with TMP401. It provides some additional

features.



* Minimum and Maximum temperature measured since power-on, chip-reset



  Exported via sysfs attributes tempX_lowest and tempX_highest.



* Reset of historical minimum/maximum temperature measurements



  Exported via sysfs attribute temp_reset_history. Writing 1 to this

  file triggers a reset.