linux-kernel - [PATCH 0/5] platform/x86: wmi: Cleanup obsolete features

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Date:   Thu,  7 Dec 2023 23:26:18 +0100
From:   Armin Wolf <W_Armin@....de>
To:     hdegoede@...hat.com, ilpo.jarvinen@...ux.intel.com, corbet@....net
Cc:     Dell.Client.Kernel@...l.com, linux-doc@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/5] platform/x86: wmi: Cleanup obsolete features

This patch series removes three features deemed obsolete:
- the debug_dump_wdg module param:
  - suffers from garbled output due to pr_cont()
  - functionality is better provided by "fwts wmi"
- the debug_event module param:
  - pr_cont() usage
  - uses the deprecated GUID-based API
  - largely replaced by the ACPI netlink interface
- ioctl interface
  - used only by a single driver, no adoption otherwise
  - numerous design issues

Since the ioctl interface is actually used by userspace programs,
the only user (the dell-smbios-wmi driver) was modified to implement
the necessary pieces itself so that no regressions are expected.

The last patch in contrast adds a short WMI driver development guide
to the WMI subsystem documentation, so that driver developers stop
submitting WMI drivers using the deprecated GUID-based interface.

The series depends on
commit cbf54f37600e ("platform/x86: wmi: Skip blocks with zero instances"),
which is currently in the "fixes" tree.

All patches where tested on a Dell Inspiron 3505 and work without
issues.

Armin Wolf (5):
  platform/x86: wmi: Remove debug_dump_wdg module param
  platform/x86: wmi: Remove debug_wmi module param
  platform/x86: dell-smbios-wmi: Stop using WMI chardev
  platform/x86: wmi: Remove chardev interface
  platform/x86: wmi: Add driver development guide

 .../wmi/driver-development-guide.rst          | 126 ++++++++
 Documentation/wmi/index.rst                   |   1 +
 drivers/platform/x86/dell/dell-smbios-wmi.c   | 163 +++++++---
 drivers/platform/x86/wmi.c                    | 285 +-----------------
 include/linux/wmi.h                           |   8 -
 5 files changed, 256 insertions(+), 327 deletions(-)
 create mode 100644 Documentation/wmi/driver-development-guide.rst

--
2.39.2