From 23b5212cc7422f475b82124334b64277b5b43013 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Fri, 2 Nov 2007 13:47:53 +0100 Subject: [PATCH] Driver Core: add kobj_attribute handling Add kobj_sysfs_ops to replace subsys_sysfs_ops. There is no need for special kset operations, we want to be able to use simple attribute operations at any kobject, not only ksets. The whole concept of any default sysfs attribute operations will go away with the upcoming removal of subsys_sysfs_ops. Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- include/linux/kobject.h | 10 ++++++++++ lib/kobject.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 39 insertions(+) diff --git a/include/linux/kobject.h b/include/linux/kobject.h index a6dd669cda9..e694261de90 100644 --- a/include/linux/kobject.h +++ b/include/linux/kobject.h @@ -126,6 +126,16 @@ struct kset_uevent_ops { struct kobj_uevent_env *env); }; +struct kobj_attribute { + struct attribute attr; + ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr, + char *buf); + ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t count); +}; + +extern struct sysfs_ops kobj_sysfs_ops; + /** * struct kset - a set of kobjects of a specific type, belonging to a specific subsystem. * diff --git a/lib/kobject.c b/lib/kobject.c index 67c3d38d48f..1c343fe4ba6 100644 --- a/lib/kobject.c +++ b/lib/kobject.c @@ -697,6 +697,35 @@ void kset_init(struct kset * k) spin_lock_init(&k->list_lock); } +/* default kobject attribute operations */ +static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr, + char *buf) +{ + struct kobj_attribute *kattr; + ssize_t ret = -EIO; + + kattr = container_of(attr, struct kobj_attribute, attr); + if (kattr->show) + ret = kattr->show(kobj, kattr, buf); + return ret; +} + +static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) +{ + struct kobj_attribute *kattr; + ssize_t ret = -EIO; + + kattr = container_of(attr, struct kobj_attribute, attr); + if (kattr->store) + ret = kattr->store(kobj, kattr, buf, count); + return ret; +} + +struct sysfs_ops kobj_sysfs_ops = { + .show = kobj_attr_show, + .store = kobj_attr_store, +}; /** * kset_add - add a kset object to the hierarchy. -- 2.20.1