linux-kernel - Re: [PATCH v2 3/4] platform/x86: wmi: Add documentation

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Date:   Tue, 25 Apr 2023 18:30:51 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>, Armin Wolf <W_Armin@....de>,
        markgross@...nel.org
Cc:     corbet@....net, linux-doc@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] platform/x86: wmi: Add documentation

Hi All,

Armin thank you very mich for the WMI documentation work,
this is much appreciated!

On 4/25/23 05:07, Randy Dunlap wrote:
> Hi--
> 
> On 4/24/23 15:29, Armin Wolf wrote:
>> Add documentation for the WMI subsystem. The documentation describes
>> both the ACPI WMI interface and the driver API for interacting with
>> the WMI driver core. The information regarding the ACPI interface
>> was retrieved from the Ubuntu kernel references and the Windows driver
>> samples available on GitHub. The documentation is supposed to help
>> driver developers writing WMI drivers, as many modern machines designed
>> to run Windows provide an ACPI WMI interface.
>>
>> Signed-off-by: Armin Wolf <W_Armin@....de>
>> ---
>>  Documentation/driver-api/index.rst   |  1 +
>>  Documentation/driver-api/wmi.rst     | 21 ++++++
>>  Documentation/subsystem-apis.rst     |  1 +
>>  Documentation/wmi/acpi-interface.rst | 96 ++++++++++++++++++++++++++++
>>  Documentation/wmi/index.rst          | 18 ++++++
>>  MAINTAINERS                          |  2 +
>>  6 files changed, 139 insertions(+)
>>  create mode 100644 Documentation/driver-api/wmi.rst
>>  create mode 100644 Documentation/wmi/acpi-interface.rst
>>  create mode 100644 Documentation/wmi/index.rst
>>
> 
>> diff --git a/Documentation/driver-api/wmi.rst b/Documentation/driver-api/wmi.rst
>> new file mode 100644
>> index 000000000000..6ca58c8249e5
>> --- /dev/null
>> +++ b/Documentation/driver-api/wmi.rst
>> @@ -0,0 +1,21 @@
>> +.. SPDX-License-Identifier: GPL-2.0-or-later
>> +
>> +==============
>> +WMI Driver API
>> +==============
>> +
>> +The WMI driver core supports a more modern bus-based interface for interacting
>> +with WMI devices, and an older GUID-based interface. The latter interface is
>> +considered to be deprecated, so new WMI drivers should generally avoid it since
>> +it has some issues with multiple WMI devices and events sharing the same GUIDs
>> +and/or notification IDs. The modern bus-based interface instead maps each
>> +WMI device to a :c:type:`struct wmi_device <wmi_device>`, so it supports
>> +WMI devices sharing GUIDs and/or notification IDs. Drivers can then register
>> +a :c:type:`struct wmi_driver <wmi_driver>`, which will be bound to compatible
>> +WMI devices by the driver core.
>> +
>> +.. kernel-doc:: include/linux/wmi.h
>> +   :internal:
> 
> There are no kernel-doc comments in include/linux/wmi.h, so this
> causes a kernel-doc warning:
> 
> ../include/linux/wmi.h:1: warning: no structured comments found
> 
> Otherwise this all looks good.

So what is the plan here, is there something we can do to fix this
new warning and should I expect a v3?  Or shall I merge this as is ?

Regards,

Hans





> 
> 
> Tested-by: Randy Dunlap <rdunlap@...radead.org>
> Acked-by: Randy Dunlap <rdunlap@...radead.org>
> 
> thanks.