1/*
2 * raid_class.h - a generic raid visualisation class
3 *
4 * Copyright (c) 2005 - James Bottomley <James.Bottomley@steeleye.com>
5 *
6 * This file is licensed under GPLv2
7 */
8#include <linux/transport_class.h>
9
10struct raid_template {
11	struct transport_container raid_attrs;
12};
13
14struct raid_function_template {
15	void *cookie;
16	int (*is_raid)(struct device *);
17	void (*get_resync)(struct device *);
18	void (*get_state)(struct device *);
19};
20
21enum raid_state {
22	RAID_STATE_UNKNOWN = 0,
23	RAID_STATE_ACTIVE,
24	RAID_STATE_DEGRADED,
25	RAID_STATE_RESYNCING,
26	RAID_STATE_OFFLINE,
27};
28
29enum raid_level {
30	RAID_LEVEL_UNKNOWN = 0,
31	RAID_LEVEL_LINEAR,
32	RAID_LEVEL_0,
33	RAID_LEVEL_1,
34	RAID_LEVEL_10,
35	RAID_LEVEL_1E,
36	RAID_LEVEL_3,
37	RAID_LEVEL_4,
38	RAID_LEVEL_5,
39	RAID_LEVEL_50,
40	RAID_LEVEL_6,
41};
42
43struct raid_data {
44	struct list_head component_list;
45	int component_count;
46	enum raid_level level;
47	enum raid_state state;
48	int resync;
49};
50
51/* resync complete goes from 0 to this */
52#define RAID_MAX_RESYNC		(10000)
53
54#define DEFINE_RAID_ATTRIBUTE(type, attr)				      \
55static inline void							      \
56raid_set_##attr(struct raid_template *r, struct device *dev, type value) {    \
57	struct device *device =						      \
58		attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
59	struct raid_data *rd;						      \
60	BUG_ON(!device);						      \
61	rd = dev_get_drvdata(device);					      \
62	rd->attr = value;						      \
63}									      \
64static inline type							      \
65raid_get_##attr(struct raid_template *r, struct device *dev) {		      \
66	struct device *device =						      \
67		attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
68	struct raid_data *rd;						      \
69	BUG_ON(!device);						      \
70	rd = dev_get_drvdata(device);					      \
71	return rd->attr;						      \
72}
73
74DEFINE_RAID_ATTRIBUTE(enum raid_level, level)
75DEFINE_RAID_ATTRIBUTE(int, resync)
76DEFINE_RAID_ATTRIBUTE(enum raid_state, state)
77
78struct raid_template *raid_class_attach(struct raid_function_template *);
79void raid_class_release(struct raid_template *);
80
81int __must_check raid_component_add(struct raid_template *, struct device *,
82				    struct device *);
83
84