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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [macintosh/] [windfarm.h] - Blame information for rev 62

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Line No. Rev Author Line
1 62 marcus.erl
/*
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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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 * Released under the term of the GNU GPL v2.
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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) ((f) >> 16),((((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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        struct wf_control_ops   *ops;
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        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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};
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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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 * wf_find_control will inc the refcount for you
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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 struct wf_control * wf_find_control(const char *name);
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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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/*
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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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        struct wf_sensor_ops    *ops;
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        char                    *name;
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        struct kref             ref;
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        struct device_attribute attr;
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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 struct wf_sensor * wf_find_sensor(const char *name);
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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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/* 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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extern int wf_is_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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