157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Windfarm PowerMac thermal control.
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*
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* (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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*/
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#ifndef __WINDFARM_H__
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#define __WINDFARM_H__
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/device.h>
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/* Display a 16.16 fixed point value */
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#define FIX32TOPRINT(f) (((s32)(f)) >> 16),(((((s32)(f)) & 0xffff) * 1000) >> 16)
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/*
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* Control objects
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*/
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struct wf_control;
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struct wf_control_ops {
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int (*set_value)(struct wf_control *ct, s32 val);
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int (*get_value)(struct wf_control *ct, s32 *val);
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s32 (*get_min)(struct wf_control *ct);
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s32 (*get_max)(struct wf_control *ct);
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void (*release)(struct wf_control *ct);
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struct module *owner;
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};
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struct wf_control {
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struct list_head link;
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const struct wf_control_ops *ops;
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const char *name;
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int type;
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struct kref ref;
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struct device_attribute attr;
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void *priv;
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};
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#define WF_CONTROL_TYPE_GENERIC 0
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#define WF_CONTROL_RPM_FAN 1
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#define WF_CONTROL_PWM_FAN 2
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/* Note about lifetime rules: wf_register_control() will initialize
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* the kref and wf_unregister_control will decrement it, thus the
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* object creating/disposing a given control shouldn't assume it
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* still exists after wf_unregister_control has been called.
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*/
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extern int wf_register_control(struct wf_control *ct);
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extern void wf_unregister_control(struct wf_control *ct);
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extern int wf_get_control(struct wf_control *ct);
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extern void wf_put_control(struct wf_control *ct);
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static inline int wf_control_set_max(struct wf_control *ct)
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{
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s32 vmax = ct->ops->get_max(ct);
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return ct->ops->set_value(ct, vmax);
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}
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static inline int wf_control_set_min(struct wf_control *ct)
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{
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s32 vmin = ct->ops->get_min(ct);
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return ct->ops->set_value(ct, vmin);
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}
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static inline int wf_control_set(struct wf_control *ct, s32 val)
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{
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return ct->ops->set_value(ct, val);
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}
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static inline int wf_control_get(struct wf_control *ct, s32 *val)
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{
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return ct->ops->get_value(ct, val);
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}
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static inline s32 wf_control_get_min(struct wf_control *ct)
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{
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return ct->ops->get_min(ct);
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}
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static inline s32 wf_control_get_max(struct wf_control *ct)
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{
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return ct->ops->get_max(ct);
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}
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/*
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* Sensor objects
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*/
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struct wf_sensor;
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struct wf_sensor_ops {
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int (*get_value)(struct wf_sensor *sr, s32 *val);
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void (*release)(struct wf_sensor *sr);
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struct module *owner;
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};
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struct wf_sensor {
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struct list_head link;
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const struct wf_sensor_ops *ops;
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const char *name;
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struct kref ref;
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struct device_attribute attr;
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void *priv;
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};
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/* Same lifetime rules as controls */
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extern int wf_register_sensor(struct wf_sensor *sr);
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extern void wf_unregister_sensor(struct wf_sensor *sr);
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extern int wf_get_sensor(struct wf_sensor *sr);
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extern void wf_put_sensor(struct wf_sensor *sr);
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static inline int wf_sensor_get(struct wf_sensor *sr, s32 *val)
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{
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return sr->ops->get_value(sr, val);
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}
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/* For use by clients. Note that we are a bit racy here since
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* notifier_block doesn't have a module owner field. I may fix
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* it one day ...
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*
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* LOCKING NOTE !
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*
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* All "events" except WF_EVENT_TICK are called with an internal mutex
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* held which will deadlock if you call basically any core routine.
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* So don't ! Just take note of the event and do your actual operations
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* from the ticker.
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*
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*/
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extern int wf_register_client(struct notifier_block *nb);
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extern int wf_unregister_client(struct notifier_block *nb);
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/* Overtemp conditions. Those are refcounted */
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extern void wf_set_overtemp(void);
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extern void wf_clear_overtemp(void);
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#define WF_EVENT_NEW_CONTROL 0 /* param is wf_control * */
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#define WF_EVENT_NEW_SENSOR 1 /* param is wf_sensor * */
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#define WF_EVENT_OVERTEMP 2 /* no param */
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#define WF_EVENT_NORMALTEMP 3 /* overtemp condition cleared */
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#define WF_EVENT_TICK 4 /* 1 second tick */
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/* Note: If that driver gets more broad use, we could replace the
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* simplistic overtemp bits with "environmental conditions". That
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* could then be used to also notify of things like fan failure,
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* case open, battery conditions, ...
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*/
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#endif /* __WINDFARM_H__ */
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