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Merge branch 'soc-fixes' into omap-for-v4.15/fixes
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Original file line number | Diff line number | Diff line change |
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What: /dev/wmi/dell-smbios | ||
Date: November 2017 | ||
KernelVersion: 4.15 | ||
Contact: "Mario Limonciello" <mario.limonciello@dell.com> | ||
Description: | ||
Perform SMBIOS calls on supported Dell machines. | ||
through the Dell ACPI-WMI interface. | ||
|
||
IOCTL's and buffer formats are defined in: | ||
<uapi/linux/wmi.h> | ||
|
||
1) To perform an SMBIOS call from userspace, you'll need to | ||
first determine the minimum size of the calling interface | ||
buffer for your machine. | ||
Platforms that contain larger buffers can return larger | ||
objects from the system firmware. | ||
Commonly this size is either 4k or 32k. | ||
|
||
To determine the size of the buffer read() a u64 dword from | ||
the WMI character device /dev/wmi/dell-smbios. | ||
|
||
2) After you've determined the minimum size of the calling | ||
interface buffer, you can allocate a structure that represents | ||
the structure documented above. | ||
|
||
3) In the 'length' object store the size of the buffer you | ||
determined above and allocated. | ||
|
||
4) In this buffer object, prepare as necessary for the SMBIOS | ||
call you're interested in. Typically SMBIOS buffers have | ||
"class", "select", and "input" defined to values that coincide | ||
with the data you are interested in. | ||
Documenting class/select/input values is outside of the scope | ||
of this documentation. Check with the libsmbios project for | ||
further documentation on these values. | ||
|
||
6) Run the call by using ioctl() as described in the header. | ||
|
||
7) The output will be returned in the buffer object. | ||
|
||
8) Be sure to free up your allocated object. |
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