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Add a convenience function to find the maximum value currently reported 

by a set (selected via a passed callback predicate) of sensors.
This provides an easy way to query the current temperature of a thermal
zone, for example, from within the kernel - assuming the caller knows
the topology.
This commit is contained in:
martin 2010-01-31 21:36:38 +00:00
parent 4acfa334d0
commit 889f82dd49
2 changed files with 72 additions and 3 deletions
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71
sys/dev/sysmon/sysmon_envsys.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: sysmon_envsys.c,v 1.91 2010/01/30 02:46:52 pgoyette Exp $ */
/* $NetBSD: sysmon_envsys.c,v 1.92 2010/01/31 21:36:38 martin Exp $ */
/*-
* Copyright (c) 2007, 2008 Juan Romero Pardines.
@ -64,7 +64,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sysmon_envsys.c,v 1.91 2010/01/30 02:46:52 pgoyette Exp $");
__KERNEL_RCSID(0, "$NetBSD: sysmon_envsys.c,v 1.92 2010/01/31 21:36:38 martin Exp $");
#include <sys/param.h>
#include <sys/types.h>
@ -93,6 +93,8 @@ static void sme_remove_userprops(void);
static int sme_add_property_dictionary(struct sysmon_envsys *, prop_array_t,
prop_dictionary_t);
static void sme_initial_refresh(void *);
static uint32_t sme_get_max_value(struct sysmon_envsys *,
bool (*)(const envsys_data_t*), bool);
/*
* sysmon_envsys_init:
@ -1411,6 +1413,71 @@ bad:
return NULL;
}
/*
* Find the maximum of all currently reported values.
* The provided callback decides wether a sensor is part of the
* maximum calculation (by returning true) or ignored (callback
* returns false). Example usage: callback selects temperature
* sensors in a given thermal zone, the function calculates the
* maximum currently reported temperature in this zone.
* If the parameter "refresh" is true, new values will be aquired
* from the hardware, if not, the last reported value will be used.
*/
uint32_t
sysmon_envsys_get_max_value(bool (*predicate)(const envsys_data_t*),
bool refresh)
{
struct sysmon_envsys *sme;
uint32_t maxv, v;
maxv = 0;
mutex_enter(&sme_global_mtx);
LIST_FOREACH(sme, &sysmon_envsys_list, sme_list) {
sysmon_envsys_acquire(sme, false);
v = sme_get_max_value(sme, predicate, refresh);
sysmon_envsys_release(sme, false);
if (v > maxv)
maxv = v;
}
mutex_exit(&sme_global_mtx);
return maxv;
}
static uint32_t
sme_get_max_value(struct sysmon_envsys *sme,
bool (*predicate)(const envsys_data_t*),
bool refresh)
{
envsys_data_t *edata;
uint32_t maxv, v;
/*
* iterate over all sensors and find temperature ones.
*/
maxv = 0;
TAILQ_FOREACH(edata, &sme->sme_sensors_list, sensors_head) {
if (!(*predicate)(edata))
continue;
/*
* refresh sensor data via sme_refresh only if the
* flag is not set.
*/
if (refresh && (sme->sme_flags & SME_DISABLE_REFRESH) == 0) {
mutex_enter(&sme->sme_mtx);
(*sme->sme_refresh)(sme, edata);
mutex_exit(&sme->sme_mtx);
}
v = edata->value_cur;
if (v > maxv)
maxv = v;
}
return maxv;
}
/*
* sme_update_dictionary:
*

4
sys/dev/sysmon/sysmonvar.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: sysmonvar.h,v 1.29 2009/06/14 19:43:12 pgoyette Exp $ */
/* $NetBSD: sysmonvar.h,v 1.30 2010/01/31 21:36:38 martin Exp $ */
/*-
* Copyright (c) 2000 Zembu Labs, Inc.
@ -134,6 +134,8 @@ void sysmon_envsys_unregister(struct sysmon_envsys *);
int sysmon_envsys_sensor_attach(struct sysmon_envsys *, envsys_data_t *);
int sysmon_envsys_sensor_detach(struct sysmon_envsys *, envsys_data_t *);
uint32_t sysmon_envsys_get_max_value(bool (*)(const envsys_data_t*), bool);
void sysmon_envsys_init(void);
/*****************************************************************************