linux-kernel - [PATCH v4 0/6] Thermal zone device structure encapsulation

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Date:   Wed, 19 Apr 2023 10:33:37 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     daniel.lezcano@...aro.org, rafael@...nel.org
Cc:     rui.zhang@...el.com, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: [PATCH v4 0/6] Thermal zone device structure encapsulation

The thermal zone device structure is defined in the exported thermal
header include/linux/thermal.h

Given the definition being public, the structure is exposed to the
external components other than the thermal framework core code. It
results the drivers are tampering the structure internals like taking
the lock or changing the field values.

Obviously that is bad for several reasons as the drivers can hook the
thermal framework behavior and makes very difficult the changes in the
core code as external components depend on it directly.

Moreover, the thermal trip points being reworked, we don't want the
drivers to access the trips array directly in the thermal zone
structure and doing assumptions on how they are organized.

This series provides a second set of changes moving to the thermal
zone device structure self-encapsulation.

The ACPI and the Menlon drivers are using the thermal zone's device
fields to create symlinks and new attributes in the sysfs thermal zone
directory. These changes provide a hopefully temporary wrapper to
access it in order to allow moving forward in the thermal zone device
self-encapsulation and a Kconfig option to disable by default such a
extra sysfs information.

Changelog:
	v4:
	- Encapsulate extra sysfs information inside a function for
          ACPI but remove the Kconfig option
	- Encapsulate extra sysfs information inside a function,
          create the stubs and put that conditionnal to a Kconfig
          option for Menlow
	v3:
	- Split the Kconfig option to be driver related when disabling
          the specific attributes
	- Use the thermal zone's device wrapper to write a trace in
          the pch intel driver
	v2:
	- Add the Kconfig option to remove specific attributes
	- Add a thermal_zone_device() wrapper to access tz->device

Daniel Lezcano (6):
  thermal/core: Encapsulate tz->device field
  thermal/drivers/intel_pch_thermal: Use thermal driver device to write
    a trace
  thermal/drivers/acpi: Use thermal_zone_device()
  thermal/drivers/menlow: Use thermal_zone_device()
  thermal/drivers/acpi: Move to dedicated function sysfs extra attr
    creation
  thermal/drivers/intel_menlow: Make additionnal sysfs information
    optional

 drivers/acpi/thermal.c                    | 47 +++++++++++++++--------
 drivers/thermal/intel/Kconfig             | 11 ++++++
 drivers/thermal/intel/intel_menlow.c      | 18 +++++++--
 drivers/thermal/intel/intel_pch_thermal.c |  3 +-
 drivers/thermal/thermal_core.c            |  6 +++
 include/linux/thermal.h                   |  1 +
 6 files changed, 67 insertions(+), 19 deletions(-)

-- 
2.34.1