2 * Windfarm PowerMac thermal control.
4 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
5 * <benh@kernel.crashing.org>
7 * Released under the term of the GNU GPL v2.
10 #ifndef __WINDFARM_H__
11 #define __WINDFARM_H__
13 #include <linux/kref.h>
14 #include <linux/list.h>
15 #include <linux/module.h>
16 #include <linux/notifier.h>
17 #include <linux/device.h>
19 /* Display a 16.16 fixed point value */
20 #define FIX32TOPRINT(f) ((f) >> 16),((((f) & 0xffff) * 1000) >> 16)
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
);
38 struct list_head link
;
39 struct wf_control_ops
*ops
;
43 struct device_attribute attr
;
46 #define WF_CONTROL_TYPE_GENERIC 0
47 #define WF_CONTROL_RPM_FAN 1
48 #define WF_CONTROL_PWM_FAN 2
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
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
);
63 static inline int wf_control_set_max(struct wf_control
*ct
)
65 s32 vmax
= ct
->ops
->get_max(ct
);
66 return ct
->ops
->set_value(ct
, vmax
);
69 static inline int wf_control_set_min(struct wf_control
*ct
)
71 s32 vmin
= ct
->ops
->get_min(ct
);
72 return ct
->ops
->set_value(ct
, vmin
);
81 struct wf_sensor_ops
{
82 int (*get_value
)(struct wf_sensor
*sr
, s32
*val
);
83 void (*release
)(struct wf_sensor
*sr
);
88 struct list_head link
;
89 struct wf_sensor_ops
*ops
;
92 struct device_attribute attr
;
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
);
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
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
114 extern int wf_register_client(struct notifier_block
*nb
);
115 extern int wf_unregister_client(struct notifier_block
*nb
);
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);
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 */
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, ...
134 #endif /* __WINDFARM_H__ */
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