linux-kernel - [PATCH v2 1/2] driver core: class: expose the class kobject

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Message-Id: <20241015-gpio-class-mountpoint-v2-1-7709301876ef@linaro.org>
Date: Tue, 15 Oct 2024 10:00:23 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Kent Gibson <warthog618@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v2 1/2] driver core: class: expose the class kobject

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Export the address of the /sys/class kobject to users that need to
chain off of it by means other than calling register_class(). This will
be used by the GPIO subsystem to provide a backward compatibility
mount-point for the GPIO sysfs class once it's disabled.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/base/class.c         | 6 ++++++
 include/linux/device/class.h | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/base/class.c b/drivers/base/class.c
index cb5359235c70..68474aff53df 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -23,6 +23,9 @@
 /* /sys/class */
 static struct kset *class_kset;

+struct kobject *class_kobj;
+EXPORT_SYMBOL_GPL(class_kobj);
+
 #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)

 /**
@@ -668,5 +671,8 @@ int __init classes_init(void)
 	class_kset = kset_create_and_add("class", NULL, NULL);
 	if (!class_kset)
 		return -ENOMEM;
+
+	class_kobj = &class_kset->kobj;
+
 	return 0;
 }
diff --git a/include/linux/device/class.h b/include/linux/device/class.h
index 518c9c83d64b..898f7948293d 100644
--- a/include/linux/device/class.h
+++ b/include/linux/device/class.h
@@ -69,6 +69,12 @@ struct class {
 	const struct dev_pm_ops *pm;
 };

+/*
+ * Global /sys/class kobject for creating sub-groups by means other than
+ * class_register().
+ */
+extern struct kobject *class_kobj;
+
 struct class_dev_iter {
 	struct klist_iter		ki;
 	const struct device_type	*type;

-- 
2.43.0