On Thu, 2015-12-17 at 11:13 -0800, Eduardo Valentin wrote:
> The idea is to add the choice to be notified only when temperature
> crosses trip points. The trip points affected are the non-passive
> trip points.
>
> It will check last temperature and current temperature against
> the trip point temperature and its hysteresis.
> In case the check shows temperature has changed enought indicating
> a trip point crossing, a uevent will be sent to userspace.
>
> The uevent contains the thermal zone type, the current temperature,
> the last temperature and the trip point in which the current
> temperature
> now resides.
>
> The behavior of ops->notify() callback remains the same.
>
IMO we need to handle also passive/active trips. I have some comments
here
https://patchwork.kernel.org/patch/8583171/
Thanks,
Srinivas
> Cc: Zhang Rui <rui.zh...@intel.com>
> Cc: linux...@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Eduardo Valentin <edubez...@gmail.com>
> ---
> V1->V2: none
> ---
> drivers/thermal/thermal_core.c | 52
> ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 52 insertions(+)
>
> diff --git a/drivers/thermal/thermal_core.c
> b/drivers/thermal/thermal_core.c
> index a229c84..e0f1f4e 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -423,6 +423,56 @@ static void handle_non_critical_trips(struct
> thermal_zone_device *tz,
> def_governor->throttle(tz, trip);
> }
>
> +static void thermal_tripped_notify(struct thermal_zone_device *tz,
> + int trip, enum thermal_trip_type
> trip_type,
> + int trip_temp)
> +{
> + char tuv_name[THERMAL_NAME_LENGTH + 15], tuv_temp[25],
> + tuv_ltemp[25], tuv_trip[25], tuv_type[25];
> + char *msg[6] = { tuv_name, tuv_temp, tuv_ltemp, tuv_trip,
> tuv_type,
> + NULL };
> + int upper_trip_hyst, upper_trip_temp, trip_hyst = 0;
> + int ret = 0;
> +
> + snprintf(tuv_name, sizeof(tuv_name), "THERMAL_ZONE=%s", tz-
> >type);
> + snprintf(tuv_temp, sizeof(tuv_temp), "TEMP=%d", tz-
> >temperature);
> + snprintf(tuv_ltemp, sizeof(tuv_ltemp), "LAST_TEMP=%d",
> + tz->last_temperature);
> + snprintf(tuv_trip, sizeof(tuv_trip), "TRIP=%d", trip);
> + snprintf(tuv_type, sizeof(tuv_type), "TRIP_TYPE=%d",
> trip_type);
> +
> + mutex_lock(&tz->lock);
> +
> + /* crossing up */
> + if (tz->last_temperature < trip_temp && trip_temp < tz-
> >temperature)
> + kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE,
> msg);
> +
> + if (tz->ops->get_trip_hyst)
> + tz->ops->get_trip_hyst(tz, trip, &trip_hyst);
> +
> + /* crossing down, check for hyst */
> + trip_temp -= trip_hyst;
> + if (tz->last_temperature > trip_temp && trip_temp > tz-
> >temperature) {
> + snprintf(tuv_trip, sizeof(tuv_trip), "TRIP=%d", trip
> - 1);
> + kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE,
> msg);
> + }
> +
> + ret = tz->ops->get_trip_temp(tz, trip + 1,
> &upper_trip_temp);
> + if (ret)
> + goto unlock;
> +
> + if (tz->ops->get_trip_hyst)
> + tz->ops->get_trip_hyst(tz, trip + 1,
> &upper_trip_hyst);
> +
> + upper_trip_temp -= upper_trip_hyst;
> + if (tz->last_temperature > upper_trip_temp &&
> + upper_trip_temp > tz->temperature)
> + kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE,
> msg);
> +
> +unlock:
> + mutex_unlock(&tz->lock);
> +}
> +
> static void handle_critical_trips(struct thermal_zone_device *tz,
> int trip, enum thermal_trip_type
> trip_type)
> {
> @@ -430,6 +480,8 @@ static void handle_critical_trips(struct
> thermal_zone_device *tz,
>
> tz->ops->get_trip_temp(tz, trip, &trip_temp);
>
> + thermal_tripped_notify(tz, trip, trip_type, trip_temp);
> +
> /* If we have not crossed the trip_temp, we do not care. */
> if (trip_temp <= 0 || tz->temperature < trip_temp)
> return;
