hwmon: (nct6775) Split core and platform driver

This splits the nct6775 driver into an interface-independent core and
a separate platform driver that wraps inb/outb port I/O (or asuswmi
methods) around that core.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Tested-by: Renze Nicolai <renze@rnplus.nl>
Link: https://lore.kernel.org/r/20220427010154.29749-7-zev@bewilderbeest.net
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

MAINTAINERS

@@ -13537,12 +13537,14 @@ M:	Samuel Mendoza-Jonas <sam@mendozajonas.com>
 S:	Maintained
 F:	net/ncsi/
 
-NCT6775 HARDWARE MONITOR DRIVER
+NCT6775 HARDWARE MONITOR DRIVER - CORE & PLATFORM DRIVER
 M:	Guenter Roeck <linux@roeck-us.net>
 L:	linux-hwmon@vger.kernel.org
 S:	Maintained
 F:	Documentation/hwmon/nct6775.rst
-F:	drivers/hwmon/nct6775.c
+F:	drivers/hwmon/nct6775-core.c
+F:	drivers/hwmon/nct6775-platform.c
+F:	drivers/hwmon/nct6775.h
 
 NETDEVSIM
 M:	Jakub Kicinski <kuba@kernel.org>

drivers/hwmon/Kconfig

@@ -1462,11 +1462,23 @@ config SENSORS_NCT6683
 	  This driver can also be built as a module. If so, the module
 	  will be called nct6683.
 
+config SENSORS_NCT6775_CORE
+	tristate
+	select REGMAP
+	help
+	  This module contains common code shared by the platform and
+	  i2c versions of the nct6775 driver; it is not useful on its
+	  own.
+
+	  If built as a module, the module will be called
+	  nct6775-core.
+
 config SENSORS_NCT6775
-	tristate "Nuvoton NCT6775F and compatibles"
+	tristate "Platform driver for Nuvoton NCT6775F and compatibles"
 	depends on !PPC
 	depends on ACPI_WMI || ACPI_WMI=n
 	select HWMON_VID
+	select SENSORS_NCT6775_CORE
 	help
 	  If you say yes here you get support for the hardware monitoring
 	  functionality of the Nuvoton NCT6106D, NCT6775F, NCT6776F, NCT6779D,

drivers/hwmon/Makefile

@@ -154,6 +154,8 @@ obj-$(CONFIG_SENSORS_MLXREG_FAN) += mlxreg-fan.o
 obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o
 obj-$(CONFIG_SENSORS_MR75203)	+= mr75203.o
 obj-$(CONFIG_SENSORS_NCT6683)	+= nct6683.o
+obj-$(CONFIG_SENSORS_NCT6775_CORE) += nct6775-core.o
+nct6775-objs			:= nct6775-platform.o
 obj-$(CONFIG_SENSORS_NCT6775)	+= nct6775.o
 obj-$(CONFIG_SENSORS_NCT7802)	+= nct7802.o
 obj-$(CONFIG_SENSORS_NCT7904)	+= nct7904.o