Merge branch 'for-6.15/amd_sfh' into for-linus

From: Mario Limonciello <mario.limonciello@amd.com>

Some platforms include a human presence detection (HPD) sensor. When
enabled and a user is detected a wake event will be emitted from the
sensor fusion hub that software can react to.

Example use cases are "wake from suspend on approach" or to "lock
when leaving".

This is currently enabled by default on supported systems, but users
can't control it. This essentially means that wake on approach is
enabled which is a really surprising behavior to users that don't
expect it.

Instead of defaulting to enabled add a sysfs knob that users can
use to enable the feature if desirable and set it to disabled by
default.

1 files changed, 8 insertions, 34 deletions

diff --git a/drivers/platform/x86/firmware_attributes_class.c b/drivers/platform/x86/firmware_attributes_class.c
index 182a07d8ae3df..736e96c186d9d 100644
--- a/drivers/platform/x86/firmware_attributes_class.c
+++ b/drivers/platform/x86/firmware_attributes_class.c
@@ -2,51 +2,25 @@
 
 /* Firmware attributes class helper module */
 
-#include <linux/mutex.h>
-#include <linux/device/class.h>
 #include <linux/module.h>
 #include "firmware_attributes_class.h"
 
-static DEFINE_MUTEX(fw_attr_lock);
-static int fw_attr_inuse;
-
-static const struct class firmware_attributes_class = {
+const struct class firmware_attributes_class = {
 	.name = "firmware-attributes",
 };
+EXPORT_SYMBOL_GPL(firmware_attributes_class);
 
-int fw_attributes_class_get(const struct class **fw_attr_class)
+static __init int fw_attributes_class_init(void)
 {
-	int err;
-
-	mutex_lock(&fw_attr_lock);
-	if (!fw_attr_inuse) { /*first time class is being used*/
-		err = class_register(&firmware_attributes_class);
-		if (err) {
-			mutex_unlock(&fw_attr_lock);
-			return err;
-		}
-	}
-	fw_attr_inuse++;
-	*fw_attr_class = &firmware_attributes_class;
-	mutex_unlock(&fw_attr_lock);
-	return 0;
+	return class_register(&firmware_attributes_class);
 }
-EXPORT_SYMBOL_GPL(fw_attributes_class_get);
+module_init(fw_attributes_class_init);
 
-int fw_attributes_class_put(void)
+static __exit void fw_attributes_class_exit(void)
 {
-	mutex_lock(&fw_attr_lock);
-	if (!fw_attr_inuse) {
-		mutex_unlock(&fw_attr_lock);
-		return -EINVAL;
-	}
-	fw_attr_inuse--;
-	if (!fw_attr_inuse) /* No more consumers */
-		class_unregister(&firmware_attributes_class);
-	mutex_unlock(&fw_attr_lock);
-	return 0;
+	class_unregister(&firmware_attributes_class);
 }
-EXPORT_SYMBOL_GPL(fw_attributes_class_put);
+module_exit(fw_attributes_class_exit);
 
 MODULE_AUTHOR("Mark Pearson <markpearson@lenovo.com>");
 MODULE_DESCRIPTION("Firmware attributes class helper module");