platform/x86: int3472: make common part a separate module

Linking an object file into multiple modules is not supported
and causes a W=1 warning:

scripts/Makefile.build:236: drivers/platform/x86/intel/int3472/Makefile: common.o is added to multiple modules: intel_skl_int3472_discrete intel_skl_int3472_tps68470

Split out the common part here into a separate module to make it
more reliable.

Fixes: a2f9fbc2 ("platform/x86: int3472: Split into 2 drivers")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20240529095009.1895618-1-arnd@kernel.orgReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/intel/int3472/Makefile

 obj-$(CONFIG_INTEL_SKL_INT3472)		+= intel_skl_int3472_discrete.o \
-					   intel_skl_int3472_tps68470.o
-intel_skl_int3472_discrete-y		:= discrete.o clk_and_regulator.o led.o common.o
-intel_skl_int3472_tps68470-y		:= tps68470.o tps68470_board_data.o common.o
+					   intel_skl_int3472_tps68470.o \
+					   intel_skl_int3472_common.o
+intel_skl_int3472_discrete-y		:= discrete.o clk_and_regulator.o led.o
+intel_skl_int3472_tps68470-y		:= tps68470.o tps68470_board_data.o
+
+intel_skl_int3472_common-y		+= common.o

drivers/platform/x86/intel/int3472/common.c

@@ -29,6 +29,7 @@ union acpi_object *skl_int3472_get_acpi_buffer(struct acpi_device *adev, char *i
 
 	return obj;
 }
+EXPORT_SYMBOL_GPL(skl_int3472_get_acpi_buffer);
 
 int skl_int3472_fill_cldb(struct acpi_device *adev, struct int3472_cldb *cldb)
 {
@@ -52,6 +53,7 @@ int skl_int3472_fill_cldb(struct acpi_device *adev, struct int3472_cldb *cldb)
 	kfree(obj);
 	return ret;
 }
+EXPORT_SYMBOL_GPL(skl_int3472_fill_cldb);
 
 /* sensor_adev_ret may be NULL, name_ret must not be NULL */
 int skl_int3472_get_sensor_adev_and_name(struct device *dev,
@@ -80,3 +82,8 @@ int skl_int3472_get_sensor_adev_and_name(struct device *dev,
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(skl_int3472_get_sensor_adev_and_name);
+
+MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI Device Driver library");
+MODULE_AUTHOR("Daniel Scally <djrscally@gmail.com>");
+MODULE_LICENSE("GPL");