Initial import

1 files changed, 510 insertions, 0 deletions

diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
new file mode 100644
index 000000000..9f6575831
--- /dev/null
+++ b/include/linux/sysfs.h
@@ -0,0 +1,510 @@
+/*
+ * sysfs.h - definitions for the device driver filesystem
+ *
+ * Copyright (c) 2001,2002 Patrick Mochel
+ * Copyright (c) 2004 Silicon Graphics, Inc.
+ * Copyright (c) 2007 SUSE Linux Products GmbH
+ * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
+ *
+ * Please see Documentation/filesystems/sysfs.txt for more information.
+ */
+
+#ifndef _SYSFS_H_
+#define _SYSFS_H_
+
+#include <linux/kernfs.h>
+#include <linux/compiler.h>
+#include <linux/errno.h>
+#include <linux/list.h>
+#include <linux/lockdep.h>
+#include <linux/kobject_ns.h>
+#include <linux/stat.h>
+#include <linux/atomic.h>
+
+struct kobject;
+struct module;
+struct bin_attribute;
+enum kobj_ns_type;
+
+struct attribute {
+	const char		*name;
+	umode_t			mode;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+	bool			ignore_lockdep:1;
+	struct lock_class_key	*key;
+	struct lock_class_key	skey;
+#endif
+};
+
+/**
+ *	sysfs_attr_init - initialize a dynamically allocated sysfs attribute
+ *	@attr: struct attribute to initialize
+ *
+ *	Initialize a dynamically allocated struct attribute so we can
+ *	make lockdep happy.  This is a new requirement for attributes
+ *	and initially this is only needed when lockdep is enabled.
+ *	Lockdep gives a nice error when your attribute is added to
+ *	sysfs if you don't have this.
+ */
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+#define sysfs_attr_init(attr)				\
+do {							\
+	static struct lock_class_key __key;		\
+							\
+	(attr)->key = &__key;				\
+} while (0)
+#else
+#define sysfs_attr_init(attr) do {} while (0)
+#endif
+
+/**
+ * struct attribute_group - data structure used to declare an attribute group.
+ * @name:	Optional: Attribute group name
+ *		If specified, the attribute group will be created in
+ *		a new subdirectory with this name.
+ * @is_visible:	Optional: Function to return permissions associated with an
+ *		attribute of the group. Will be called repeatedly for each
+ *		attribute in the group. Only read/write permissions as well as
+ *		SYSFS_PREALLOC are accepted. Must return 0 if an attribute is
+ *		not visible. The returned value will replace static permissions
+ *		defined in struct attribute or struct bin_attribute.
+ * @attrs:	Pointer to NULL terminated list of attributes.
+ * @bin_attrs:	Pointer to NULL terminated list of binary attributes.
+ *		Either attrs or bin_attrs or both must be provided.
+ */
+struct attribute_group {
+	const char		*name;
+	umode_t			(*is_visible)(struct kobject *,
+					      struct attribute *, int);
+	struct attribute	**attrs;
+	struct bin_attribute	**bin_attrs;
+};
+
+/**
+ * Use these macros to make defining attributes easier. See include/linux/device.h
+ * for examples..
+ */
+
+#define SYSFS_PREALLOC 010000
+
+#define __ATTR(_name, _mode, _show, _store) {				\
+	.attr = {.name = __stringify(_name),				\
+		 .mode = VERIFY_OCTAL_PERMISSIONS(_mode) },		\
+	.show	= _show,						\
+	.store	= _store,						\
+}
+
+#define __ATTR_PREALLOC(_name, _mode, _show, _store) {			\
+	.attr = {.name = __stringify(_name),				\
+		 .mode = SYSFS_PREALLOC | VERIFY_OCTAL_PERMISSIONS(_mode) },\
+	.show	= _show,						\
+	.store	= _store,						\
+}
+
+#define __ATTR_RO(_name) {						\
+	.attr	= { .name = __stringify(_name), .mode = S_IRUGO },	\
+	.show	= _name##_show,						\
+}
+
+#define __ATTR_WO(_name) {						\
+	.attr	= { .name = __stringify(_name), .mode = S_IWUSR },	\
+	.store	= _name##_store,					\
+}
+
+#define __ATTR_RW(_name) __ATTR(_name, (S_IWUSR | S_IRUGO),		\
+			 _name##_show, _name##_store)
+
+#define __ATTR_NULL { .attr = { .name = NULL } }
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+#define __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) {	\
+	.attr = {.name = __stringify(_name), .mode = _mode,	\
+			.ignore_lockdep = true },		\
+	.show		= _show,				\
+	.store		= _store,				\
+}
+#else
+#define __ATTR_IGNORE_LOCKDEP	__ATTR
+#endif
+
+#define __ATTRIBUTE_GROUPS(_name)				\
+static const struct attribute_group *_name##_groups[] = {	\
+	&_name##_group,						\
+	NULL,							\
+}
+
+#define ATTRIBUTE_GROUPS(_name)					\
+static const struct attribute_group _name##_group = {		\
+	.attrs = _name##_attrs,					\
+};								\
+__ATTRIBUTE_GROUPS(_name)
+
+struct file;
+struct vm_area_struct;
+
+struct bin_attribute {
+	struct attribute	attr;
+	size_t			size;
+	void			*private;
+	ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *,
+			char *, loff_t, size_t);
+	ssize_t (*write)(struct file *, struct kobject *, struct bin_attribute *,
+			 char *, loff_t, size_t);
+	int (*mmap)(struct file *, struct kobject *, struct bin_attribute *attr,
+		    struct vm_area_struct *vma);
+};
+
+/**
+ *	sysfs_bin_attr_init - initialize a dynamically allocated bin_attribute
+ *	@attr: struct bin_attribute to initialize
+ *
+ *	Initialize a dynamically allocated struct bin_attribute so we
+ *	can make lockdep happy.  This is a new requirement for
+ *	attributes and initially this is only needed when lockdep is
+ *	enabled.  Lockdep gives a nice error when your attribute is
+ *	added to sysfs if you don't have this.
+ */
+#define sysfs_bin_attr_init(bin_attr) sysfs_attr_init(&(bin_attr)->attr)
+
+/* macros to create static binary attributes easier */
+#define __BIN_ATTR(_name, _mode, _read, _write, _size) {		\
+	.attr = { .name = __stringify(_name), .mode = _mode },		\
+	.read	= _read,						\
+	.write	= _write,						\
+	.size	= _size,						\
+}
+
+#define __BIN_ATTR_RO(_name, _size) {					\
+	.attr	= { .name = __stringify(_name), .mode = S_IRUGO },	\
+	.read	= _name##_read,						\
+	.size	= _size,						\
+}
+
+#define __BIN_ATTR_RW(_name, _size) __BIN_ATTR(_name,			\
+				   (S_IWUSR | S_IRUGO), _name##_read,	\
+				   _name##_write, _size)
+
+#define __BIN_ATTR_NULL __ATTR_NULL
+
+#define BIN_ATTR(_name, _mode, _read, _write, _size)			\
+struct bin_attribute bin_attr_##_name = __BIN_ATTR(_name, _mode, _read,	\
+					_write, _size)
+
+#define BIN_ATTR_RO(_name, _size)					\
+struct bin_attribute bin_attr_##_name = __BIN_ATTR_RO(_name, _size)
+
+#define BIN_ATTR_RW(_name, _size)					\
+struct bin_attribute bin_attr_##_name = __BIN_ATTR_RW(_name, _size)
+
+struct sysfs_ops {
+	ssize_t	(*show)(struct kobject *, struct attribute *, char *);
+	ssize_t	(*store)(struct kobject *, struct attribute *, const char *, size_t);
+};
+
+#ifdef CONFIG_SYSFS
+
+int __must_check sysfs_create_dir_ns(struct kobject *kobj, const void *ns);
+void sysfs_remove_dir(struct kobject *kobj);
+int __must_check sysfs_rename_dir_ns(struct kobject *kobj, const char *new_name,
+				     const void *new_ns);
+int __must_check sysfs_move_dir_ns(struct kobject *kobj,
+				   struct kobject *new_parent_kobj,
+				   const void *new_ns);
+int __must_check sysfs_create_mount_point(struct kobject *parent_kobj,
+					  const char *name);
+void sysfs_remove_mount_point(struct kobject *parent_kobj,
+			      const char *name);
+
+int __must_check sysfs_create_file_ns(struct kobject *kobj,
+				      const struct attribute *attr,
+				      const void *ns);
+int __must_check sysfs_create_files(struct kobject *kobj,
+				   const struct attribute **attr);
+int __must_check sysfs_chmod_file(struct kobject *kobj,
+				  const struct attribute *attr, umode_t mode);
+void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr,
+			  const void *ns);
+bool sysfs_remove_file_self(struct kobject *kobj, const struct attribute *attr);
+void sysfs_remove_files(struct kobject *kobj, const struct attribute **attr);
+
+int __must_check sysfs_create_bin_file(struct kobject *kobj,
+				       const struct bin_attribute *attr);
+void sysfs_remove_bin_file(struct kobject *kobj,
+			   const struct bin_attribute *attr);
+
+int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target,
+				   const char *name);
+int __must_check sysfs_create_link_nowarn(struct kobject *kobj,
+					  struct kobject *target,
+					  const char *name);
+void sysfs_remove_link(struct kobject *kobj, const char *name);
+
+int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *target,
+			 const char *old_name, const char *new_name,
+			 const void *new_ns);
+
+void sysfs_delete_link(struct kobject *dir, struct kobject *targ,
+			const char *name);
+
+int __must_check sysfs_create_group(struct kobject *kobj,
+				    const struct attribute_group *grp);
+int __must_check sysfs_create_groups(struct kobject *kobj,
+				     const struct attribute_group **groups);
+int sysfs_update_group(struct kobject *kobj,
+		       const struct attribute_group *grp);
+void sysfs_remove_group(struct kobject *kobj,
+			const struct attribute_group *grp);
+void sysfs_remove_groups(struct kobject *kobj,
+			 const struct attribute_group **groups);
+int sysfs_add_file_to_group(struct kobject *kobj,
+			const struct attribute *attr, const char *group);
+void sysfs_remove_file_from_group(struct kobject *kobj,
+			const struct attribute *attr, const char *group);
+int sysfs_merge_group(struct kobject *kobj,
+		       const struct attribute_group *grp);
+void sysfs_unmerge_group(struct kobject *kobj,
+		       const struct attribute_group *grp);
+int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
+			    struct kobject *target, const char *link_name);
+void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
+				  const char *link_name);
+
+void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
+
+int __must_check sysfs_init(void);
+
+static inline void sysfs_enable_ns(struct kernfs_node *kn)
+{
+	return kernfs_enable_ns(kn);
+}
+
+#else /* CONFIG_SYSFS */
+
+static inline int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
+{
+	return 0;
+}
+
+static inline void sysfs_remove_dir(struct kobject *kobj)
+{
+}
+
+static inline int sysfs_rename_dir_ns(struct kobject *kobj,
+				      const char *new_name, const void *new_ns)
+{
+	return 0;
+}
+
+static inline int sysfs_move_dir_ns(struct kobject *kobj,
+				    struct kobject *new_parent_kobj,
+				    const void *new_ns)
+{
+	return 0;
+}
+
+static inline int sysfs_create_mount_point(struct kobject *parent_kobj,
+					   const char *name)
+{
+	return 0;
+}
+
+static inline void sysfs_remove_mount_point(struct kobject *parent_kobj,
+					    const char *name)
+{
+}
+
+static inline int sysfs_create_file_ns(struct kobject *kobj,
+				       const struct attribute *attr,
+				       const void *ns)
+{
+	return 0;
+}
+
+static inline int sysfs_create_files(struct kobject *kobj,
+				    const struct attribute **attr)
+{
+	return 0;
+}
+
+static inline int sysfs_chmod_file(struct kobject *kobj,
+				   const struct attribute *attr, umode_t mode)
+{
+	return 0;
+}
+
+static inline void sysfs_remove_file_ns(struct kobject *kobj,
+					const struct attribute *attr,
+					const void *ns)
+{
+}
+
+static inline bool sysfs_remove_file_self(struct kobject *kobj,
+					  const struct attribute *attr)
+{
+	return false;
+}
+
+static inline void sysfs_remove_files(struct kobject *kobj,
+				     const struct attribute **attr)
+{
+}
+
+static inline int sysfs_create_bin_file(struct kobject *kobj,
+					const struct bin_attribute *attr)
+{
+	return 0;
+}
+
+static inline void sysfs_remove_bin_file(struct kobject *kobj,
+					 const struct bin_attribute *attr)
+{
+}
+
+static inline int sysfs_create_link(struct kobject *kobj,
+				    struct kobject *target, const char *name)
+{
+	return 0;
+}
+
+static inline int sysfs_create_link_nowarn(struct kobject *kobj,
+					   struct kobject *target,
+					   const char *name)
+{
+	return 0;
+}
+
+static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
+{
+}
+
+static inline int sysfs_rename_link_ns(struct kobject *k, struct kobject *t,
+				       const char *old_name,
+				       const char *new_name, const void *ns)
+{
+	return 0;
+}
+
+static inline void sysfs_delete_link(struct kobject *k, struct kobject *t,
+				     const char *name)
+{
+}
+
+static inline int sysfs_create_group(struct kobject *kobj,
+				     const struct attribute_group *grp)
+{
+	return 0;
+}
+
+static inline int sysfs_create_groups(struct kobject *kobj,
+				      const struct attribute_group **groups)
+{
+	return 0;
+}
+
+static inline int sysfs_update_group(struct kobject *kobj,
+				const struct attribute_group *grp)
+{
+	return 0;
+}
+
+static inline void sysfs_remove_group(struct kobject *kobj,
+				      const struct attribute_group *grp)
+{
+}
+
+static inline void sysfs_remove_groups(struct kobject *kobj,
+				       const struct attribute_group **groups)
+{
+}
+
+static inline int sysfs_add_file_to_group(struct kobject *kobj,
+		const struct attribute *attr, const char *group)
+{
+	return 0;
+}
+
+static inline void sysfs_remove_file_from_group(struct kobject *kobj,
+		const struct attribute *attr, const char *group)
+{
+}
+
+static inline int sysfs_merge_group(struct kobject *kobj,
+		       const struct attribute_group *grp)
+{
+	return 0;
+}
+
+static inline void sysfs_unmerge_group(struct kobject *kobj,
+		       const struct attribute_group *grp)
+{
+}
+
+static inline int sysfs_add_link_to_group(struct kobject *kobj,
+		const char *group_name, struct kobject *target,
+		const char *link_name)
+{
+	return 0;
+}
+
+static inline void sysfs_remove_link_from_group(struct kobject *kobj,
+		const char *group_name, const char *link_name)
+{
+}
+
+static inline void sysfs_notify(struct kobject *kobj, const char *dir,
+				const char *attr)
+{
+}
+
+static inline int __must_check sysfs_init(void)
+{
+	return 0;
+}
+
+static inline void sysfs_enable_ns(struct kernfs_node *kn)
+{
+}
+
+#endif /* CONFIG_SYSFS */
+
+static inline int __must_check sysfs_create_file(struct kobject *kobj,
+						 const struct attribute *attr)
+{
+	return sysfs_create_file_ns(kobj, attr, NULL);
+}
+
+static inline void sysfs_remove_file(struct kobject *kobj,
+				     const struct attribute *attr)
+{
+	sysfs_remove_file_ns(kobj, attr, NULL);
+}
+
+static inline int sysfs_rename_link(struct kobject *kobj, struct kobject *target,
+				    const char *old_name, const char *new_name)
+{
+	return sysfs_rename_link_ns(kobj, target, old_name, new_name, NULL);
+}
+
+static inline void sysfs_notify_dirent(struct kernfs_node *kn)
+{
+	kernfs_notify(kn);
+}
+
+static inline struct kernfs_node *sysfs_get_dirent(struct kernfs_node *parent,
+						   const unsigned char *name)
+{
+	return kernfs_find_and_get(parent, name);
+}
+
+static inline struct kernfs_node *sysfs_get(struct kernfs_node *kn)
+{
+	kernfs_get(kn);
+	return kn;
+}
+
+static inline void sysfs_put(struct kernfs_node *kn)
+{
+	kernfs_put(kn);
+}
+
+#endif /* _SYSFS_H_ */