windfarm.h
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/*
* Windfarm PowerMac thermal control.
*
* (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
* <benh@kernel.crashing.org>
*
* Released under the term of the GNU GPL v2.
*/
#ifndef __WINDFARM_H__
#define __WINDFARM_H__
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/device.h>
/* Display a 16.16 fixed point value */
#define FIX32TOPRINT(f) (((s32)(f)) >> 16),(((((s32)(f)) & 0xffff) * 1000) >> 16)
/*
* Control objects
*/
struct wf_control;
struct wf_control_ops {
int (*set_value)(struct wf_control *ct, s32 val);
int (*get_value)(struct wf_control *ct, s32 *val);
s32 (*get_min)(struct wf_control *ct);
s32 (*get_max)(struct wf_control *ct);
void (*release)(struct wf_control *ct);
struct module *owner;
};
struct wf_control {
struct list_head link;
const struct wf_control_ops *ops;
const char *name;
int type;
struct kref ref;
struct device_attribute attr;
void *priv;
};
#define WF_CONTROL_TYPE_GENERIC 0
#define WF_CONTROL_RPM_FAN 1
#define WF_CONTROL_PWM_FAN 2
/* Note about lifetime rules: wf_register_control() will initialize
* the kref and wf_unregister_control will decrement it, thus the
* object creating/disposing a given control shouldn't assume it
* still exists after wf_unregister_control has been called.
*/
extern int wf_register_control(struct wf_control *ct);
extern void wf_unregister_control(struct wf_control *ct);
extern int wf_get_control(struct wf_control *ct);
extern void wf_put_control(struct wf_control *ct);
static inline int wf_control_set_max(struct wf_control *ct)
{
s32 vmax = ct->ops->get_max(ct);
return ct->ops->set_value(ct, vmax);
}
static inline int wf_control_set_min(struct wf_control *ct)
{
s32 vmin = ct->ops->get_min(ct);
return ct->ops->set_value(ct, vmin);
}
static inline int wf_control_set(struct wf_control *ct, s32 val)
{
return ct->ops->set_value(ct, val);
}
static inline int wf_control_get(struct wf_control *ct, s32 *val)
{
return ct->ops->get_value(ct, val);
}
static inline s32 wf_control_get_min(struct wf_control *ct)
{
return ct->ops->get_min(ct);
}
static inline s32 wf_control_get_max(struct wf_control *ct)
{
return ct->ops->get_max(ct);
}
/*
* Sensor objects
*/
struct wf_sensor;
struct wf_sensor_ops {
int (*get_value)(struct wf_sensor *sr, s32 *val);
void (*release)(struct wf_sensor *sr);
struct module *owner;
};
struct wf_sensor {
struct list_head link;
const struct wf_sensor_ops *ops;
const char *name;
struct kref ref;
struct device_attribute attr;
void *priv;
};
/* Same lifetime rules as controls */
extern int wf_register_sensor(struct wf_sensor *sr);
extern void wf_unregister_sensor(struct wf_sensor *sr);
extern int wf_get_sensor(struct wf_sensor *sr);
extern void wf_put_sensor(struct wf_sensor *sr);
static inline int wf_sensor_get(struct wf_sensor *sr, s32 *val)
{
return sr->ops->get_value(sr, val);
}
/* For use by clients. Note that we are a bit racy here since
* notifier_block doesn't have a module owner field. I may fix
* it one day ...
*
* LOCKING NOTE !
*
* All "events" except WF_EVENT_TICK are called with an internal mutex
* held which will deadlock if you call basically any core routine.
* So don't ! Just take note of the event and do your actual operations
* from the ticker.
*
*/
extern int wf_register_client(struct notifier_block *nb);
extern int wf_unregister_client(struct notifier_block *nb);
/* Overtemp conditions. Those are refcounted */
extern void wf_set_overtemp(void);
extern void wf_clear_overtemp(void);
#define WF_EVENT_NEW_CONTROL 0 /* param is wf_control * */
#define WF_EVENT_NEW_SENSOR 1 /* param is wf_sensor * */
#define WF_EVENT_OVERTEMP 2 /* no param */
#define WF_EVENT_NORMALTEMP 3 /* overtemp condition cleared */
#define WF_EVENT_TICK 4 /* 1 second tick */
/* Note: If that driver gets more broad use, we could replace the
* simplistic overtemp bits with "environmental conditions". That
* could then be used to also notify of things like fan failure,
* case open, battery conditions, ...
*/
#endif /* __WINDFARM_H__ */