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75722d39 BH |
1 | /* |
2 | * Windfarm PowerMac thermal control. | |
3 | * | |
4 | * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. | |
5 | * <benh@kernel.crashing.org> | |
6 | * | |
7 | * Released under the term of the GNU GPL v2. | |
8 | */ | |
9 | ||
10 | #ifndef __WINDFARM_H__ | |
11 | #define __WINDFARM_H__ | |
12 | ||
13 | #include <linux/kref.h> | |
14 | #include <linux/list.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/notifier.h> | |
ac171c46 | 17 | #include <linux/device.h> |
75722d39 BH |
18 | |
19 | /* Display a 16.16 fixed point value */ | |
20 | #define FIX32TOPRINT(f) ((f) >> 16),((((f) & 0xffff) * 1000) >> 16) | |
21 | ||
22 | /* | |
23 | * Control objects | |
24 | */ | |
25 | ||
26 | struct wf_control; | |
27 | ||
28 | struct wf_control_ops { | |
29 | int (*set_value)(struct wf_control *ct, s32 val); | |
30 | int (*get_value)(struct wf_control *ct, s32 *val); | |
31 | s32 (*get_min)(struct wf_control *ct); | |
32 | s32 (*get_max)(struct wf_control *ct); | |
33 | void (*release)(struct wf_control *ct); | |
34 | struct module *owner; | |
35 | }; | |
36 | ||
37 | struct wf_control { | |
38 | struct list_head link; | |
39 | struct wf_control_ops *ops; | |
40 | char *name; | |
41 | int type; | |
42 | struct kref ref; | |
ac171c46 | 43 | struct device_attribute attr; |
75722d39 BH |
44 | }; |
45 | ||
46 | #define WF_CONTROL_TYPE_GENERIC 0 | |
47 | #define WF_CONTROL_RPM_FAN 1 | |
48 | #define WF_CONTROL_PWM_FAN 2 | |
49 | ||
50 | ||
51 | /* Note about lifetime rules: wf_register_control() will initialize | |
52 | * the kref and wf_unregister_control will decrement it, thus the | |
53 | * object creating/disposing a given control shouldn't assume it | |
54 | * still exists after wf_unregister_control has been called. | |
55 | * wf_find_control will inc the refcount for you | |
56 | */ | |
57 | extern int wf_register_control(struct wf_control *ct); | |
58 | extern void wf_unregister_control(struct wf_control *ct); | |
59 | extern struct wf_control * wf_find_control(const char *name); | |
60 | extern int wf_get_control(struct wf_control *ct); | |
61 | extern void wf_put_control(struct wf_control *ct); | |
62 | ||
63 | static inline int wf_control_set_max(struct wf_control *ct) | |
64 | { | |
65 | s32 vmax = ct->ops->get_max(ct); | |
66 | return ct->ops->set_value(ct, vmax); | |
67 | } | |
68 | ||
69 | static inline int wf_control_set_min(struct wf_control *ct) | |
70 | { | |
71 | s32 vmin = ct->ops->get_min(ct); | |
72 | return ct->ops->set_value(ct, vmin); | |
73 | } | |
74 | ||
75 | /* | |
76 | * Sensor objects | |
77 | */ | |
78 | ||
79 | struct wf_sensor; | |
80 | ||
81 | struct wf_sensor_ops { | |
82 | int (*get_value)(struct wf_sensor *sr, s32 *val); | |
83 | void (*release)(struct wf_sensor *sr); | |
84 | struct module *owner; | |
85 | }; | |
86 | ||
87 | struct wf_sensor { | |
88 | struct list_head link; | |
89 | struct wf_sensor_ops *ops; | |
90 | char *name; | |
91 | struct kref ref; | |
ac171c46 | 92 | struct device_attribute attr; |
75722d39 BH |
93 | }; |
94 | ||
95 | /* Same lifetime rules as controls */ | |
96 | extern int wf_register_sensor(struct wf_sensor *sr); | |
97 | extern void wf_unregister_sensor(struct wf_sensor *sr); | |
98 | extern struct wf_sensor * wf_find_sensor(const char *name); | |
99 | extern int wf_get_sensor(struct wf_sensor *sr); | |
100 | extern void wf_put_sensor(struct wf_sensor *sr); | |
101 | ||
102 | /* For use by clients. Note that we are a bit racy here since | |
103 | * notifier_block doesn't have a module owner field. I may fix | |
104 | * it one day ... | |
105 | * | |
106 | * LOCKING NOTE ! | |
107 | * | |
108 | * All "events" except WF_EVENT_TICK are called with an internal mutex | |
109 | * held which will deadlock if you call basically any core routine. | |
110 | * So don't ! Just take note of the event and do your actual operations | |
111 | * from the ticker. | |
112 | * | |
113 | */ | |
114 | extern int wf_register_client(struct notifier_block *nb); | |
115 | extern int wf_unregister_client(struct notifier_block *nb); | |
116 | ||
117 | /* Overtemp conditions. Those are refcounted */ | |
118 | extern void wf_set_overtemp(void); | |
119 | extern void wf_clear_overtemp(void); | |
120 | extern int wf_is_overtemp(void); | |
121 | ||
122 | #define WF_EVENT_NEW_CONTROL 0 /* param is wf_control * */ | |
123 | #define WF_EVENT_NEW_SENSOR 1 /* param is wf_sensor * */ | |
124 | #define WF_EVENT_OVERTEMP 2 /* no param */ | |
125 | #define WF_EVENT_NORMALTEMP 3 /* overtemp condition cleared */ | |
126 | #define WF_EVENT_TICK 4 /* 1 second tick */ | |
127 | ||
128 | /* Note: If that driver gets more broad use, we could replace the | |
129 | * simplistic overtemp bits with "environmental conditions". That | |
130 | * could then be used to also notify of things like fan failure, | |
131 | * case open, battery conditions, ... | |
132 | */ | |
133 | ||
134 | #endif /* __WINDFARM_H__ */ |