Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm-4.9 / 13864515f7bf6cabd60e63c62e09d311386ae1f1 / . / drivers / macintosh / windfarm.h
blob: 7a2482cc26a7a09af070916482c0bf51bee1747a [file] [log] [blame]
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100[diff] [blame]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>
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100[diff] [blame]17#include <linux/device.h>
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100[diff] [blame]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
26struct wf_control;
27
28struct 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
37struct wf_control {
38 struct list_head link;
39 struct wf_control_ops *ops;
40 char *name;
41 int type;
42 struct kref ref;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100[diff] [blame]43 struct device_attribute attr;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100[diff] [blame]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 */
57extern int wf_register_control(struct wf_control *ct);
58extern void wf_unregister_control(struct wf_control *ct);
59extern struct wf_control * wf_find_control(const char *name);
60extern int wf_get_control(struct wf_control *ct);
61extern void wf_put_control(struct wf_control *ct);
62
63static 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
69static 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
79struct wf_sensor;
80
81struct 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
87struct wf_sensor {
88 struct list_head link;
89 struct wf_sensor_ops *ops;
90 char *name;
91 struct kref ref;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100[diff] [blame]92 struct device_attribute attr;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100[diff] [blame]93};
94
95/* Same lifetime rules as controls */
96extern int wf_register_sensor(struct wf_sensor *sr);
97extern void wf_unregister_sensor(struct wf_sensor *sr);
98extern struct wf_sensor * wf_find_sensor(const char *name);
99extern int wf_get_sensor(struct wf_sensor *sr);
100extern 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 */
114extern int wf_register_client(struct notifier_block *nb);
115extern int wf_unregister_client(struct notifier_block *nb);
116
117/* Overtemp conditions. Those are refcounted */
118extern void wf_set_overtemp(void);
119extern void wf_clear_overtemp(void);
120extern 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__ */