This patch series adds support for an alternative SMM calling backend to the dell-smm-hwmon driver. The reason for this is that on some modern machines, the legacy SMM calling interface does not work anymore and the SMM handler can be called over ACPI WMI instead. The first four patches prepare the driver by allowing to specify different SMM calling backends, and by moving most of the DMI handling into i8k_init() so that the DMI tables can keep their __initconst attributes (the WMI SMM backend driver does not probe at module init time). The fifth patch does some minor cleanup, while the next three patches implement the new WMI SMM calling backend. The last patch adds the machine of the user who requested and tested the changes to the fan control whitelist. If the driver does not detect the legacy SMM interface, either because the machine is not whitelisted or because the SMM handler does not react, it registers an WMI driver which will then bound to the WMI SMM interface and do the remaining initialization. The deprecated procfs interface is not supported when using the WMI SMM calling backend for the following reason: the WMI driver can potentially be instantiated multiple times while the deprectated procfs interface cannot. This should not cause any regressions because on machines supporting only the WMI SMM interface, the driver would, until now, not load anyway. All patches where tested on a Dell Inspiron 3505 and a Dell OptiPlex 7000. Changes since v2: - Rework WMI response parsing - Use #define for method number Changes since v1: - Cc platform driver maintainers - Fix formating inside documentation Armin Wolf (9): hwmon: (dell-smm) Prepare for multiple SMM calling backends hwmon: (dell-smm) Move blacklist handling to module init hwmon: (dell-smm) Move whitelist handling to module init hwmon: (dell-smm) Move DMI config handling to module init hwmon: (dell-smm) Move config entries out of i8k_dmi_table hwmon: (dell-smm) Introduce helper function for data init hwmon: (dell-smm) Add support for WMI SMM interface hwmon: (dell-smm) Document the WMI SMM interface hwmon: (dell-smm) Add Optiplex 7000 to fan control whitelist Documentation/hwmon/dell-smm-hwmon.rst | 38 +- drivers/hwmon/Kconfig | 1 + drivers/hwmon/dell-smm-hwmon.c | 603 +++++++++++++++++-------- drivers/platform/x86/wmi.c | 1 + 4 files changed, 453 insertions(+), 190 deletions(-) -- 2.39.2
