platform/x86: dell-wmi-sysman: Use firmware_attributes_class helper

Update Dell WMI sysman driver to use newly implemented helper module.
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mark Pearson <markpearson@lenovo.com>
Link: https://lore.kernel.org/r/20210530223111.25929-2-markpearson@lenovo.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/dell/Kconfig

@@ -206,6 +206,7 @@ config DELL_WMI_SYSMAN
 	depends on ACPI_WMI
 	depends on DMI
 	select NLS
+	select FW_ATTR_CLASS
 	help
 	  This driver allows changing BIOS settings on many Dell machines from
 	  2018 and newer without the use of any additional software.

drivers/platform/x86/dell/dell-wmi-sysman/sysman.c

@@ -13,14 +13,11 @@
 #include <linux/kernel.h>
 #include <linux/wmi.h>
 #include "dell-wmi-sysman.h"
+#include "../../firmware_attributes_class.h"
 
 #define MAX_TYPES  4
 #include <linux/nls.h>
 
-static struct class firmware_attributes_class = {
-	.name = "firmware-attributes",
-};
-
 struct wmi_sysman_priv wmi_priv = {
 	.mutex = __MUTEX_INITIALIZER(wmi_priv.mutex),
 };
@@ -28,6 +25,7 @@ struct wmi_sysman_priv wmi_priv = {
 /* reset bios to defaults */
 static const char * const reset_types[] = {"builtinsafe", "lastknowngood", "factory", "custom"};
 static int reset_option = -1;
+struct class *fw_attr_class;
 
 
 /**
@@ -542,11 +540,11 @@ static int __init sysman_init(void)
 		goto err_exit_bios_attr_pass_interface;
 	}
 
-	ret = class_register(&firmware_attributes_class);
+	ret = fw_attributes_class_get(&fw_attr_class);
 	if (ret)
 		goto err_exit_bios_attr_pass_interface;
 
-	wmi_priv.class_dev = device_create(&firmware_attributes_class, NULL, MKDEV(0, 0),
+	wmi_priv.class_dev = device_create(fw_attr_class, NULL, MKDEV(0, 0),
 				  NULL, "%s", DRIVER_NAME);
 	if (IS_ERR(wmi_priv.class_dev)) {
 		ret = PTR_ERR(wmi_priv.class_dev);
@@ -603,10 +601,10 @@ static int __init sysman_init(void)
 	release_attributes_data();
 
 err_destroy_classdev:
-	device_destroy(&firmware_attributes_class, MKDEV(0, 0));
+	device_destroy(fw_attr_class, MKDEV(0, 0));
 
 err_unregister_class:
-	class_unregister(&firmware_attributes_class);
+	fw_attributes_class_put();
 
 err_exit_bios_attr_pass_interface:
 	exit_bios_attr_pass_interface();
@@ -620,8 +618,8 @@ static int __init sysman_init(void)
 static void __exit sysman_exit(void)
 {
 	release_attributes_data();
-	device_destroy(&firmware_attributes_class, MKDEV(0, 0));
-	class_unregister(&firmware_attributes_class);
+	device_destroy(fw_attr_class, MKDEV(0, 0));
+	fw_attributes_class_put();
 	exit_bios_attr_set_interface();
 	exit_bios_attr_pass_interface();
 }