linux/drivers/macintosh/windfarm.h
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   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>
  17#include <linux/device.h>
  18
  19/* Display a 16.16 fixed point value */
  20#define FIX32TOPRINT(f) (((s32)(f)) >> 16),(((((s32)(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        const struct wf_control_ops     *ops;
  40        const char                      *name;
  41        int                             type;
  42        struct kref                     ref;
  43        struct device_attribute         attr;
  44        void                            *priv;
  45};
  46
  47#define WF_CONTROL_TYPE_GENERIC         0
  48#define WF_CONTROL_RPM_FAN              1
  49#define WF_CONTROL_PWM_FAN              2
  50
  51
  52/* Note about lifetime rules: wf_register_control() will initialize
  53 * the kref and wf_unregister_control will decrement it, thus the
  54 * object creating/disposing a given control shouldn't assume it
  55 * still exists after wf_unregister_control has been called.
  56 * wf_find_control will inc the refcount for you
  57 */
  58extern int wf_register_control(struct wf_control *ct);
  59extern void wf_unregister_control(struct wf_control *ct);
  60extern struct wf_control * wf_find_control(const char *name);
  61extern int wf_get_control(struct wf_control *ct);
  62extern void wf_put_control(struct wf_control *ct);
  63
  64static inline int wf_control_set_max(struct wf_control *ct)
  65{
  66        s32 vmax = ct->ops->get_max(ct);
  67        return ct->ops->set_value(ct, vmax);
  68}
  69
  70static inline int wf_control_set_min(struct wf_control *ct)
  71{
  72        s32 vmin = ct->ops->get_min(ct);
  73        return ct->ops->set_value(ct, vmin);
  74}
  75
  76static inline int wf_control_set(struct wf_control *ct, s32 val)
  77{
  78        return ct->ops->set_value(ct, val);
  79}
  80
  81static inline int wf_control_get(struct wf_control *ct, s32 *val)
  82{
  83        return ct->ops->get_value(ct, val);
  84}
  85
  86static inline s32 wf_control_get_min(struct wf_control *ct)
  87{
  88        return ct->ops->get_min(ct);
  89}
  90
  91static inline s32 wf_control_get_max(struct wf_control *ct)
  92{
  93        return ct->ops->get_max(ct);
  94}
  95
  96/*
  97 * Sensor objects
  98 */
  99
 100struct wf_sensor;
 101
 102struct wf_sensor_ops {
 103        int                     (*get_value)(struct wf_sensor *sr, s32 *val);
 104        void                    (*release)(struct wf_sensor *sr);
 105        struct module           *owner;
 106};
 107
 108struct wf_sensor {
 109        struct list_head                link;
 110        const struct wf_sensor_ops      *ops;
 111        const char                      *name;
 112        struct kref                     ref;
 113        struct device_attribute         attr;
 114        void                            *priv;
 115};
 116
 117/* Same lifetime rules as controls */
 118extern int wf_register_sensor(struct wf_sensor *sr);
 119extern void wf_unregister_sensor(struct wf_sensor *sr);
 120extern struct wf_sensor * wf_find_sensor(const char *name);
 121extern int wf_get_sensor(struct wf_sensor *sr);
 122extern void wf_put_sensor(struct wf_sensor *sr);
 123
 124static inline int wf_sensor_get(struct wf_sensor *sr, s32 *val)
 125{
 126        return sr->ops->get_value(sr, val);
 127}
 128
 129/* For use by clients. Note that we are a bit racy here since
 130 * notifier_block doesn't have a module owner field. I may fix
 131 * it one day ...
 132 *
 133 * LOCKING NOTE !
 134 *
 135 * All "events" except WF_EVENT_TICK are called with an internal mutex
 136 * held which will deadlock if you call basically any core routine.
 137 * So don't ! Just take note of the event and do your actual operations
 138 * from the ticker.
 139 *
 140 */
 141extern int wf_register_client(struct notifier_block *nb);
 142extern int wf_unregister_client(struct notifier_block *nb);
 143
 144/* Overtemp conditions. Those are refcounted */
 145extern void wf_set_overtemp(void);
 146extern void wf_clear_overtemp(void);
 147extern int wf_is_overtemp(void);
 148
 149#define WF_EVENT_NEW_CONTROL    0 /* param is wf_control * */
 150#define WF_EVENT_NEW_SENSOR     1 /* param is wf_sensor * */
 151#define WF_EVENT_OVERTEMP       2 /* no param */
 152#define WF_EVENT_NORMALTEMP     3 /* overtemp condition cleared */
 153#define WF_EVENT_TICK           4 /* 1 second tick */
 154
 155/* Note: If that driver gets more broad use, we could replace the
 156 * simplistic overtemp bits with "environmental conditions". That
 157 * could then be used to also notify of things like fan failure,
 158 * case open, battery conditions, ...
 159 */
 160
 161#endif /* __WINDFARM_H__ */
 162
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