On 一, 2012-06-11 at 12:54 +0300, Eduardo Valentin wrote:
> Hello Rui,
>
> On Mon, Jun 11, 2012 at 11:20:06AM +0800, Zhang Rui wrote:
> >
> > tc1 and tc2 are ACPI platform specific concepts, introduce
> > .get_trend() as a more general solution.
> >
> >
> > Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
> > ---
> > drivers/acpi/thermal.c | 32 ++++++++++++++++++++++++++++++++
> > drivers/thermal/thermal_sys.c | 19 +++++++++++++++++--
> > include/linux/thermal.h | 9 +++++++++
> > 3 files changed, 58 insertions(+), 2 deletions(-)
> >
> > Index: rtd3/drivers/acpi/thermal.c
> > ===================================================================
> > --- rtd3.orig/drivers/acpi/thermal.c
> > +++ rtd3/drivers/acpi/thermal.c
> > @@ -706,6 +706,37 @@ static int thermal_get_crit_temp(struct
> > return -EINVAL;
> > }
> >
> > +static int thermal_get_trend(struct thermal_zone_device *thermal,
> > + int trip, enum thermal_trend *trend)
> > +{
> > + struct acpi_thermal *tz = thermal->devdata;
> > + enum thermal_trip_type type;
> > + unsigned long trip_temp;
> > + int i;
> > +
> > + if (thermal_get_trip_type(thermal, trip, &type))
> > + return -EINVAL;
> > +
> > + /* Only PASSIVE trip points need TREND */
> > + if (type != THERMAL_TRIP_PASSIVE)
> > + return -EINVAL;
> > +
> > + if (thermal_get_trip_temp(thermal, trip, &trip_temp))
> > + return -EINVAL;
> > +
> > + /*
> > + * tz->temperature has already been updated by generic thermal layer,
> > + * before this callback being invoked
> > + */
> > + i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
> > + + (tz->trips.passive.tc2 * (tz->temperature - trip_temp));
> > +
> > + *trend = i > 0 ? THERMAL_TREND_RAISING :
> > + (i < 0 ? THERMAL_TREND_DROPPING : THERMAL_TREND_NONE);
> > + return 0;
> > +}
> > +
> > +
> > static int thermal_notify(struct thermal_zone_device *thermal, int trip,
> > enum thermal_trip_type trip_type)
> > {
> > @@ -835,6 +866,7 @@ static const struct thermal_zone_device_
> > .get_trip_type = thermal_get_trip_type,
> > .get_trip_temp = thermal_get_trip_temp,
> > .get_crit_temp = thermal_get_crit_temp,
> > + .get_trend = thermal_get_trend,
> > .notify = thermal_notify,
> > };
> >
> > Index: rtd3/drivers/thermal/thermal_sys.c
> > ===================================================================
> > --- rtd3.orig/drivers/thermal/thermal_sys.c
> > +++ rtd3/drivers/thermal/thermal_sys.c
> > @@ -657,6 +657,18 @@ thermal_remove_hwmon_sysfs(struct therma
> > }
> > #endif
> >
> > +static void thermal_get_trend (struct thermal_zone_device *tz,
> > + int trip, enum thermal_trend *trend)
> > +{
> > + if (tz->ops->get_trend)
> > + if (!tz->ops->get_trend(tz, trip, trend))
> > + return;
> > +
> > + *trend = tz->temperature >= tz->last_temperature ?
> > + THERMAL_TREND_RAISING : THERMAL_TREND_DROPPING;
> > + return;
> > +}
> > +
> > static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
> > int delay)
> > {
> > @@ -691,6 +703,8 @@ static void thermal_zone_device_passive(
> > if (temp >= trip_temp) {
> > tz->passive = true;
> >
> > + thermal_get_trend(tz, trip, (enum thermal_trend *)&trend);
> > +
> > trend = (tz->tc1 * (temp - tz->last_temperature)) +
> > (tz->tc2 * (temp - trip_temp));
> >
> > @@ -1049,6 +1063,9 @@ void thermal_zone_device_update(struct t
> > goto leave;
> > }
> >
> > + tz->last_temperature = tz->temperature;
> > + tz->temperature = temp;
> > +
> > for (count = 0; count < tz->trips; count++) {
> > tz->ops->get_trip_type(tz, count, &trip_type);
> > tz->ops->get_trip_temp(tz, count, &trip_temp);
> > @@ -1108,8 +1125,6 @@ void thermal_zone_device_update(struct t
> > thermal_zone_device_passive(tz, temp, tz->forced_passive,
> > THERMAL_TRIPS_NONE);
> >
> > - tz->last_temperature = temp;
> > -
> > leave:
> > if (tz->passive)
> > thermal_zone_device_set_polling(tz, tz->passive_delay);
> > Index: rtd3/include/linux/thermal.h
> > ===================================================================
> > --- rtd3.orig/include/linux/thermal.h
> > +++ rtd3/include/linux/thermal.h
> > @@ -44,6 +44,12 @@ enum thermal_trip_type {
> > THERMAL_TRIP_CRITICAL,
> > };
> >
> > +enum thermal_trend {
> > + THERMAL_TREND_NONE,
> > + THERMAL_TREND_RAISING,
> > + THERMAL_TREND_DROPPING,
> > +};
> > +
>
> Nip: Can you please add some doc for the expected definition for all enum entries above?
> Is TREND_NONE supposed to mean "Stable", for instance?
>
yep. TREND_STABLE sounds better. I'm not good at naming.
thanks,
rui
> > struct thermal_zone_device_ops {
> > int (*bind) (struct thermal_zone_device *,
> > struct thermal_cooling_device *);
> > @@ -59,6 +65,8 @@ struct thermal_zone_device_ops {
> > int (*get_trip_temp) (struct thermal_zone_device *, int,
> > unsigned long *);
> > int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
> > + int (*get_trend) (struct thermal_zone_device *, int,
> > + enum thermal_trend *);
> > int (*notify) (struct thermal_zone_device *, int,
> > enum thermal_trip_type);
> > };
> > @@ -95,6 +103,7 @@ struct thermal_zone_device {
> > int tc2;
> > int passive_delay;
> > int polling_delay;
> > + int temperature;
> > int last_temperature;
> > bool passive;
> > unsigned int forced_passive;
> >
> >
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