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The values returned by the driver after processing the contents of the
Shunt Voltage Register and the Shunt Limit Registers do not correspond to
the TMP512/TMP513 specifications. A raw register value is converted to a
signed integer value by a sign extension in accordance with the algorithm
provided in the specification, but due to the off-by-one error in the sign
bit index, the result is incorrect. Moreover, the PGA shift calculated with
the tmp51x_get_pga_shift function is relevant only to the Shunt Voltage
Register, but is also applied to the Shunt Limit Registers.
According to the TMP512 and TMP513 datasheets, the Shunt Voltage Register
(04h) is 13 to 16 bit two's complement integer value, depending on the PGA
setting. The Shunt Positive (0Ch) and Negative (0Dh) Limit Registers are
16-bit two's complement integer values. Below are some examples:
* Shunt Voltage Register
If PGA = 8, and regval = 1000 0011 0000 0000, then the decimal value must
be -32000, but the value calculated by the driver will be 33536.
* Shunt Limit Register
If regval = 1000 0011 0000 0000, then the decimal value must be -32000, but
the value calculated by the driver will be 768, if PGA = 1.
Fix sign bit index, and also correct misleading comment describing the
tmp51x_get_pga_shift function.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes:
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 reStructuredText 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.