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A mirror of the official Linux kernel repository just in case
b2644494a4
ADT7461 and TMP451 temperature sensors support extended temperature ranges. If standard temperature range is selected, the temperature range is unsigned and limited to 0 .. 127 degrees C. For TMP461, the standard temperature range is -128000 ... 127000 degrees C. Distinguish between the two chips by introducing a feature flag indicating if the standard temperature range is signed or unsigned. Use the same flag for MAX6646/ MAX6647 as well since those chips also support unsigned temperatures. Note that while the datasheet for ADT7461 suggests that the default temperature range is unsigned, tests with a real chip suggest that this is not the case: If the temperature offset is set to a value << 0, the temperature register does report negative values. Tests with real chips show that MAX6680/MAX6681 and SA56004 report temperatures of 128 degrees C and higher as negative temperatures. Add respective comments to the code. Also use clamp_val() and DIV_ROUND_CLOSEST where appropriate in calculations. Signed-off-by: Guenter Roeck <linux@roeck-us.net> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.