On 6/25/15 5:44 PM, Charles Keepax wrote:
On Thu, Jun 25, 2015 at 03:58:53PM +0100, Mark Brown wrote:
On Thu, Jun 25, 2015 at 02:18:23PM +0200, Christian Hartmann wrote:
Name (_HID, "WM510205") // _HID: Hardware ID
Name (_CID, "WM510205") // _CID: Compatible ID
Name (_DDN, "Wolfson Microelectronics Audio WM5102")
Separately to the chip select discussion one thing to highlight here is
that for some reason the BIOS is listing the device as "WM510205" rather
than "WM5102" - do those extra numbers mean anything and does this mean
that WM50120[1-4] and possibly higher numbers are also valid?
From my brief discussions with the Windows guys here on this
basically those last two digits are being used to inform the
Windows driver of use-case setup. So here it will set things up
for whatever the Window's driver considers to be setup "5".
I think from the Linux side we can safely ignore those last two
digits. I expect that all systems of the same make and model
would report the same last two digits but that it might change
between models if the Windows driver is expected to something
differently for that model.
Here's the summary of what a valid _HID should look like. It took me a
couple of days to gather the rules from different sources, I hope it
helps others figure things out.
-Pierre
_HID must be one of these forms:
- "AAA####” or EisaID(“AAA####”) where A is an uppercase letter and # is
a hex digit. The AAA PNP Vendor ID consists of 3 characters, verified on
http://www.uefi.org/sites/default/files/resources/PNPID_List.pdf
- "ACPI####” where # is a hex digit
- "NNNN####” where N is an uppercase letter or decimal digit (0-9) and #
is a hex digit (ACPI 5.0).
The NNNN Vendor ID can be
--> a PCI ID: 4 hex digits (0-9 and A-F), verified on
https://www.pcisig.com/membership/vid_search/
--> or an ACPI ID: 4 characters, each character being either an
uppercase letter (A-Z) or a numeral (0-9), verified on
http://www.uefi.org/sites/default/files/resources/ACPIID_List.pdf
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