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

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Date:   Mon, 24 Apr 2023 20:07:58 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Armin Wolf <W_Armin@....de>, hdegoede@...hat.com,
        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--

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.


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

thanks.
-- 
~Randy