hwmon: (dell-smm) Prepare for multiple SMM calling backends
Modern Dell machines support multiple ways to issue an SMM call. Prepare support for those by introducing dell_smm_ops, which is used by dell_smm_call() to perform a SMM call. Each SMM backend needs to provide a dell_smm_ops structure. Tested-by: <serverror@serverror.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Pali Rohár <pali@kernel.org> Signed-off-by: Armin Wolf <W_Armin@gmx.de> Link: https://lore.kernel.org/r/20231123004820.50635-2-W_Armin@gmx.deSigned-off-by: Guenter Roeck <linux@roeck-us.net>
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