linux-kernel - Re: [PATCH v2 2/4] thermal: of: Extend of-thermal.c to provide check if trip point is enabled

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Message-ID: <20141125082524.GA13924@developer>
Date:	Tue, 25 Nov 2014 04:25:26 -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 2/4] thermal: of: Extend of-thermal.c to provide check
 if trip point is enabled


Lukasz,

Same stuff here.

On Thu, Nov 20, 2014 at 05:21:26PM +0100, Lukasz Majewski wrote:
> This patch extends the of-thermal.c to provide check if trip point is
> enabled.
> 
> Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
> ---
> Changes for v2:
> - Replace int with bool
> - Replace 1/0 with true/false
> - Add check if data pointer is not NULL
> - Add missing doxygen style comment for the function
> ---
>  drivers/thermal/of-thermal.c   | 20 ++++++++++++++++++++
>  drivers/thermal/thermal_core.h |  5 +++++
>  2 files changed, 25 insertions(+)
> 
> diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
> index 7170822..336af7f 100644
> --- a/drivers/thermal/of-thermal.c
> +++ b/drivers/thermal/of-thermal.c
> @@ -132,6 +132,26 @@ int of_thermal_get_ntrips(struct thermal_zone_device *tz)
>  	return data->ntrips;
>  }
>  
> +/**
> + * of_thermal_is_trip_en - function to check if trip point is enabled
> + *
> + * @tz:	pointer to a thermal zone
> + * @trip:	trip point to evaluate
> + *
> + * This function is responsible for checking if passed trip point is enabled
> + *
> + * Return: true if trip point is enabled, false otherwise
> + */
> +bool of_thermal_is_trip_en(struct thermal_zone_device *tz, int trip)

This one looks more like "is this trip point valid?" than "is this trip
point enabled?", isn't it?

By having such a function to check if a trip is enabled, one would
expect to have functions to enable / disable trips points.

What do you think of naming it:
of_thermal_is_trip_valid()
?

> +{
> +	struct __thermal_zone *data = tz->devdata;
> +
> +	if (!data || trip >= data->ntrips || trip < 0)

Even your check is about looking if the trip value is within a range,
telling the caller if the trip is valid or not, right?

> +		return false;
> +
> +	return true;
> +}
> +

Missing:
EXPORT_SYMBOL_GPL(of_thermal_is_trip_en);

or

EXPORT_SYMBOL_GPL(of_thermal_is_trip_valid);

>  static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
>  				enum thermal_trend *trend)
>  {
> diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
> index c3c7b82..466208c 100644
> --- a/drivers/thermal/thermal_core.h
> +++ b/drivers/thermal/thermal_core.h
> @@ -90,6 +90,7 @@ static inline void thermal_gov_user_space_unregister(void) {}
>  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);
>  #else
>  static inline int of_parse_thermal_zones(void) { return 0; }
>  static inline void of_thermal_destroy_zones(void) { }
> @@ -97,6 +98,10 @@ static inline int of_thermal_get_ntrips(struct thermal_zone_device *)
>  {
>  	return 0;
>  }
> +static inline bool of_thermal_is_trip_en(struct thermal_zone_device *, int)

Same as in patch 01, this produces compilation error. Please, name your
parameters.

> +{
> +	return 0;
> +}
>  #endif
>  
>  #endif /* __THERMAL_CORE_H__ */
> -- 
> 2.0.0.rc2
> 

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