Re: [PATCH v2 3/4] thermal: of: Extend of-thermal to export table of trip points

[Lukasz Majewski]

Hi Eduardo,

> Hello Lukasz,
> 
> On Thu, Nov 20, 2014 at 05:21:27PM +0100, Lukasz Majewski wrote:
> > This patch extends the of-thermal.c to export copy of trip points
> > for a given thermal zone.
> > 
> > Thermal drivers should use of_thermal_get_trip_points() method to
> > get pointer to table of thermal trip points.
> > 
> > Signed-off-by: Lukasz Majewski <l.majewski@xxxxxxxxxxx>
> > ---
> > Changes for v2:
> > - New patch - as suggested by Eduardo Valentin
> > ---
> >  drivers/thermal/of-thermal.c   | 33
> > +++++++++++++++++++++++++++++++++ drivers/thermal/thermal_core.h |
> > 7 +++++++ include/linux/thermal.h        | 14 ++++++++++++++
> >  3 files changed, 54 insertions(+)
> > 
> > diff --git a/drivers/thermal/of-thermal.c
> > b/drivers/thermal/of-thermal.c index 336af7f..33921c5 100644
> > --- a/drivers/thermal/of-thermal.c
> > +++ b/drivers/thermal/of-thermal.c
> > @@ -89,6 +89,7 @@ struct __thermal_zone {
> >  	/* trip data */
> >  	int ntrips;
> >  	struct __thermal_trip *trips;
> > +	struct thermal_trip *gtrips;
> >  
> >  	/* cooling binding data */
> >  	int num_tbps;
> > @@ -152,6 +153,27 @@ bool of_thermal_is_trip_en(struct
> > thermal_zone_device *tz, int trip) return true;
> >  }
> >  
> > +/**
> > + * of_thermal_get_trip_points - function to get access to a
> > globally exported
> > + *				trip points
> > + *
> > + * @tz:	pointer to a thermal zone
> > + *
> > + * This function provides a pointer to the copy of trip points
> > table
> > + *
> > + * Return: pointer to trip points table, NULL otherwise
> > + */
> > +const struct thermal_trip * const
> > +of_thermal_get_trip_points(struct thermal_zone_device *tz)
> > +{
> > +	struct __thermal_zone *data = tz->devdata;
> > +
> > +	if (!data)
> > +		return NULL;
> > +
> > +	return data->gtrips;
> > +}
> > +
> 
> EXPORT_SYMBOL_GPL(of_thermal_get_trip_points);

Ok.

> 
> >  static int of_thermal_get_trend(struct thermal_zone_device *tz,
> > int trip, enum thermal_trend *trend)
> >  {
> > @@ -767,6 +789,16 @@ thermal_of_build_thermal_zone(struct
> > device_node *np) goto free_tbps;
> >  	}
> >  
> > +	tz->gtrips = kcalloc(tz->ntrips, sizeof(*tz->gtrips),
> > GFP_KERNEL);
> > +	if (!tz->gtrips) {
> > +		ret = -ENOMEM;
> > +		goto free_tbps;
> > +	}
> > +
> > +	for (i = 0; i < tz->ntrips; i++)
> > +		memcpy(&(tz->gtrips[i]),
> > &(tz->trips[i].temperature),
> > +		       sizeof(*tz->gtrips));
> > +
> >  finish:
> >  	of_node_put(child);
> >  	tz->mode = THERMAL_DEVICE_DISABLED;
> > @@ -793,6 +825,7 @@ static inline void of_thermal_free_zone(struct
> > __thermal_zone *tz) {
> >  	int i;
> >  
> > +	kfree(tz->gtrips);
> >  	for (i = 0; i < tz->num_tbps; i++)
> >  		of_node_put(tz->tbps[i].cooling_device);
> >  	kfree(tz->tbps);
> > diff --git a/drivers/thermal/thermal_core.h
> > b/drivers/thermal/thermal_core.h index 466208c..a9580ca 100644
> > --- a/drivers/thermal/thermal_core.h
> > +++ b/drivers/thermal/thermal_core.h
> > @@ -91,6 +91,8 @@ int of_parse_thermal_zones(void);
> >  void of_thermal_destroy_zones(void);
> >  int of_thermal_get_ntrips(struct thermal_zone_device *);
> >  bool of_thermal_is_trip_en(struct thermal_zone_device *, int);
> > +const struct thermal_trip * const
> > +of_thermal_get_trip_points(struct thermal_zone_device *);
> >  #else
> >  static inline int of_parse_thermal_zones(void) { return 0; }
> >  static inline void of_thermal_destroy_zones(void) { }
> > @@ -102,6 +104,11 @@ static inline bool
> > of_thermal_is_trip_en(struct thermal_zone_device *, int) {
> 
> This produces compilation error when CONFIG_THERMAL_OF is not set.
> Name the parameters to fix.

As all the other cases, I will fix that.

> 
> >  	return 0;
> >  }
> > +static inline const struct thermal_trip * const
> > +of_thermal_get_trip_points(struct thermal_zone_device *)
> > +{
> > +	return NULL;
> > +}
> >  #endif
> >  
> >  #endif /* __THERMAL_CORE_H__ */
> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > index 5bc28a7..88d7249 100644
> > --- a/include/linux/thermal.h
> > +++ b/include/linux/thermal.h
> > @@ -303,6 +303,20 @@ struct thermal_zone_of_device_ops {
> >  	int (*get_trend)(void *, long *);
> >  };
> >  
> > +/**
> > + * struct thermal_trip - Structure representing themal trip points
> > exported from
> > + *                       of-thermal
> > + *
> 
> The only problem I have with this name is that would look like it is
> in use in all thermal framework, which is not really the case. But I
> do think having a type here is a good thing. So, not sure :-)

It can stay to be struct thermal_trip or we can rename it to
struct of_thermal_trip.

I'm fine with both names.

> 
> > + * @temperature:	trip point temperature
> > + * @hysteresis:		trip point hysteresis
> > + * @type:		trip point type
> > + */
> > +struct thermal_trip {
> > +	unsigned long int temperature;
> > +	unsigned long int hysteresis;
> > +	enum thermal_trip_type type;
> > +};
> > +
> >  /* Function declarations */
> >  #ifdef CONFIG_THERMAL_OF
> >  struct thermal_zone_device *
> > -- 
> > 2.0.0.rc2
> > 



-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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