148 lines
5.4 KiB
C
148 lines
5.4 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* configfs_macros.h - extends macros for configfs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*
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* Based on sysfs:
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* sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel
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*
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* Based on kobject.h:
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* Copyright (c) 2002-2003 Patrick Mochel
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* Copyright (c) 2002-2003 Open Source Development Labs
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*
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* configfs Copyright (C) 2005 Oracle. All rights reserved.
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*
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* Added CONFIGFS_EATTR() macros from original configfs.h macros
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* Copright (C) 2008-2009 Nicholas A. Bellinger <nab@linux-iscsi.org>
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*
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* Please read Documentation/filesystems/configfs.txt before using the
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* configfs interface, ESPECIALLY the parts about reference counts and
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* item destructors.
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*/
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#ifndef _CONFIGFS_MACROS_H_
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#define _CONFIGFS_MACROS_H_
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#include <linux/configfs.h>
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/*
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* Users often need to create attribute structures for their configurable
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* attributes, containing a configfs_attribute member and function pointers
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* for the show() and store() operations on that attribute. If they don't
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* need anything else on the extended attribute structure, they can use
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* this macro to define it. The argument _name isends up as
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* 'struct _name_attribute, as well as names of to CONFIGFS_ATTR_OPS() below.
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* The argument _item is the name of the structure containing the
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* struct config_item or struct config_group structure members
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*/
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#define CONFIGFS_EATTR_STRUCT(_name, _item) \
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struct _name##_attribute { \
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struct configfs_attribute attr; \
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ssize_t (*show)(struct _item *, char *); \
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ssize_t (*store)(struct _item *, const char *, size_t); \
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}
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/*
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* With the extended attribute structure, users can use this macro
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* (similar to sysfs' __ATTR) to make defining attributes easier.
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* An example:
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* #define MYITEM_EATTR(_name, _mode, _show, _store) \
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* struct myitem_attribute childless_attr_##_name = \
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* __CONFIGFS_EATTR(_name, _mode, _show, _store)
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*/
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#define __CONFIGFS_EATTR(_name, _mode, _show, _store) \
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{ \
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.attr = { \
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.ca_name = __stringify(_name), \
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.ca_mode = _mode, \
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.ca_owner = THIS_MODULE, \
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}, \
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.show = _show, \
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.store = _store, \
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}
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/* Here is a readonly version, only requiring a show() operation */
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#define __CONFIGFS_EATTR_RO(_name, _show) \
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{ \
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.attr = { \
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.ca_name = __stringify(_name), \
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.ca_mode = 0444, \
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.ca_owner = THIS_MODULE, \
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}, \
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.show = _show, \
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}
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/*
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* With these extended attributes, the simple show_attribute() and
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* store_attribute() operations need to call the show() and store() of the
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* attributes. This is a common pattern, so we provide a macro to define
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* them. The argument _name is the name of the attribute defined by
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* CONFIGFS_ATTR_STRUCT(). The argument _item is the name of the structure
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* containing the struct config_item or struct config_group structure member.
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* The argument _item_member is the actual name of the struct config_* struct
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* in your _item structure. Meaning my_structure->some_config_group.
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* ^^_item^^^^^ ^^_item_member^^^
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* This macro expects the attributes to be named "struct <name>_attribute".
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*/
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#define CONFIGFS_EATTR_OPS_TO_FUNC(_name, _item, _item_member) \
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static struct _item *to_##_name(struct config_item *ci) \
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{ \
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return (ci) ? container_of(to_config_group(ci), struct _item, \
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_item_member) : NULL; \
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}
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#define CONFIGFS_EATTR_OPS_SHOW(_name, _item) \
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static ssize_t _name##_attr_show(struct config_item *item, \
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struct configfs_attribute *attr, \
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char *page) \
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{ \
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struct _item *_item = to_##_name(item); \
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struct _name##_attribute * _name##_attr = \
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container_of(attr, struct _name##_attribute, attr); \
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ssize_t ret = 0; \
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\
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if (_name##_attr->show) \
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ret = _name##_attr->show(_item, page); \
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return ret; \
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}
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#define CONFIGFS_EATTR_OPS_STORE(_name, _item) \
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static ssize_t _name##_attr_store(struct config_item *item, \
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struct configfs_attribute *attr, \
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const char *page, size_t count) \
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{ \
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struct _item *_item = to_##_name(item); \
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struct _name##_attribute * _name##_attr = \
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container_of(attr, struct _name##_attribute, attr); \
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ssize_t ret = -EINVAL; \
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\
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if (_name##_attr->store) \
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ret = _name##_attr->store(_item, page, count); \
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return ret; \
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}
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#define CONFIGFS_EATTR_OPS(_name, _item, _item_member) \
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CONFIGFS_EATTR_OPS_TO_FUNC(_name, _item, _item_member); \
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CONFIGFS_EATTR_OPS_SHOW(_name, _item); \
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CONFIGFS_EATTR_OPS_STORE(_name, _item);
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#define CONFIGFS_EATTR_OPS_RO(_name, _item, _item_member) \
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CONFIGFS_EATTR_OPS_TO_FUNC(_name, _item, _item_member); \
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CONFIGFS_EATTR_OPS_SHOW(_name, _item);
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#endif /* _CONFIGFS_MACROS_H_ */
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