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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 | /* * 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__ */ |