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