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The WMI queries are performed by evaluating the WMPV() method from ACPI
DSDT tables, and it takes three arguments: instance index, method id and
input data (buffer).
Currently the method id is hard-coded to 0x3 in hp_wmi_perform_query()
which means that it will perform WMI calls that expect an output data of
size 0x80 (128). The output size is usually OK for the WMI queries we
perform, however it would be better to pick the correct one before
evaluating the WMI method.
Which correct method id to choose can be figured out by looking at the
following ASL code from WVPI() method:
...
Name (PVSZ, Package (0x05)
{
Zero,
0x04,
0x80,
0x0400,
0x1000
})
Store (Zero, Local0)
If (LAnd (LGreaterEqual (Arg1, One), LLessEqual (Arg1, 0x05)))
{
Store (DerefOf (Index (PVSZ, Subtract (Arg1, One))), Local0)
}
...
Arg1 is the method id and PVSZ is the package used to index the
corresponding output size; 1 -> 0, 2 -> 4, 3 -> 128, 4 -> 1024, 5 ->
4096.
This patch maps the output size passed in hp_wmi_perform_query() to the
correct method id before evaluating the WMI method.
Signed-off-by: Paulo Alcantara <pcacjr@zytor.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.