linux-kernel - [PATCH 3/5] driver core: class: add function to create /sys/class/<class>/foo directory

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Message-Id: <1567946472-10075-4-git-send-email-akinobu.mita@gmail.com>
Date:   Sun,  8 Sep 2019 21:41:10 +0900
From:   Akinobu Mita <akinobu.mita@...il.com>
To:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Akinobu Mita <akinobu.mita@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>
Subject: [PATCH 3/5] driver core: class: add function to create /sys/class/<class>/foo directory

This adds a new function class_kobject_create_and_add() that creates a
directory in the /sys/class/<class>.

This function is required to create the /sys/class/leds/triggers directory
that contains all available LED triggers.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc: Pavel Machek <pavel@....cz>
Cc: Dan Murphy <dmurphy@...com>
Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
---
 drivers/base/class.c   | 7 +++++++
 include/linux/device.h | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/drivers/base/class.c b/drivers/base/class.c
index d8a6a58..f4c53e7 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -104,6 +104,13 @@ void class_remove_file_ns(struct class *cls, const struct class_attribute *attr,
 		sysfs_remove_file_ns(&cls->p->subsys.kobj, &attr->attr, ns);
 }
 
+struct kobject *class_kobject_create_and_add(const char *name,
+					     struct class *cls)
+{
+	return kobject_create_and_add(name, &cls->p->subsys.kobj);
+}
+EXPORT_SYMBOL_GPL(class_kobject_create_and_add);
+
 static struct class *class_get(struct class *cls)
 {
 	if (cls)
diff --git a/include/linux/device.h b/include/linux/device.h
index 6717ade..335e901 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -505,6 +505,9 @@ static inline void class_remove_file(struct class *class,
 	return class_remove_file_ns(class, attr, NULL);
 }
 
+struct kobject * __must_check class_kobject_create_and_add(const char *name,
+							   struct class *cls);
+
 /* Simple class attribute that is just a static string */
 struct class_attribute_string {
 	struct class_attribute attr;
-- 
2.7.4