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

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Date:	Tue, 25 Nov 2014 16:38:47 -0400
From:	Eduardo Valentin <edubezval@...il.com>
To:	Lukasz Majewski <l.majewski@...sung.com>
Cc:	Zhang Rui <rui.zhang@...el.com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Lukasz Majewski <l.majewski@...ess.pl>,
	Mikko Perttunen <mperttunen@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Abhilash Kesavan <kesavan.abhilash@...il.com>,
	Abhilash Kesavan <a.kesavan@...sung.com>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-kernel@...r.kernel.org,
	Caesar Wang <caesar.wang@...k-chips.com>
Subject: Re: [PATCH v2 3/4] thermal: of: Extend of-thermal to export table of
 trip points

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@...sung.com>
> ---
> 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)

Another thing, can you please check why scripts/kernel-doc does not like
this prototype? It throws an warn:
Warning(drivers/thermal/of-thermal.c:168): cannot understand function
prototype: '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;
> +}
> +
>  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)
>  {
>  	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
> + *
> + * @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
> 

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