| 1 |
62 |
marcus.erl |
/*
|
| 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>
|
| 17 |
|
|
#include <linux/device.h>
|
| 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;
|
| 43 |
|
|
struct device_attribute attr;
|
| 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;
|
| 92 |
|
|
struct device_attribute attr;
|
| 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__ */
|
