Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

Kernel driver w83l785ts

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Supported chips:

  * Winbond W83L785TS-S

    Prefix: 'w83l785ts'

    Addresses scanned: I2C 0x2e

    Datasheet: Publicly available at the Winbond USA website

               http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf

Authors:

        Jean Delvare 

Description

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The W83L785TS-S is a digital temperature sensor. It senses the

temperature of a single external diode. The high limit is

theoretically defined as 85 or 100 degrees C through a combination

of external resistors, so the user cannot change it. Values seen so

far suggest that the two possible limits are actually 95 and 110

degrees C. The datasheet is rather poor and obviously inaccurate

on several points including this one.

All temperature values are given in degrees Celsius. Resolution

is 1.0 degree. See the datasheet for details.

The w83l785ts driver will not update its values more frequently than

every other second; reading them more often will do no harm, but will

return 'old' values.

Known Issues

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On some systems (Asus), the BIOS is known to interfere with the driver

and cause read errors. The driver will retry a given number of times

(5 by default) and then give up, returning the old value (or 0 if

there is no old value). It seems to work well enough so that you should

not notice anything. Thanks to James Bolt for helping test this feature.