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Several hardware monitoring chips optionally support Packet Error Checking (PEC). For some chips, PEC support can be enabled simply by setting I2C_CLIENT_PEC in the i2c client data structure. Others require chip specific code to enable or disable PEC support. Introduce hwmon_chip_pec and HWMON_C_PEC to simplify adding configurable PEC support for hardware monitoring drivers. A driver can set HWMON_C_PEC in its chip information data to indicate PEC support. If a chip requires chip specific code to enable or disable PEC support, the driver only needs to implement support for the hwmon_chip_pec attribute to its write function. Packet Error Checking is only supported for SMBus devices. HWMON_C_PEC must therefore only be set by a driver if the parent device is an I2C device. Attempts to set HWMON_C_PEC on any other device type is not supported and rejected. The code calls i2c_check_functionality() to check if PEC is supported by the I2C/SMBus controller. This function is only available if CONFIG_I2C is enabled and reachable. For this reason, the added code needs to depend on reachability of CONFIG_I2C. Cc: Radu Sabau <radu.sabau@analog.com> Acked-by: Nuno Sa <nuno.sa@analog.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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.