linux-kernel - Re: [PATCH v3 1/5] thermal: of: Extend of-thermal.c to provide number of trip points

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Date:	Mon, 8 Dec 2014 15:52:49 -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>,
	navneet kumar <navneetk@...dia.com>
Subject: Re: [PATCH v3 1/5] thermal: of: Extend of-thermal.c to provide
 number of trip points

On Mon, Dec 08, 2014 at 06:04:17PM +0100, Lukasz Majewski wrote:
> This patch extends the of-thermal.c to provide information about number of
> available trip points.
> 
> Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
> ---
> Changes for v3:
> - Exporting of_thermal_get_ntrips symbol as a GPL
> - Fix build error when CONFIG_THERMAL_OF is disabled
> 
> Changes for v2:
> - Provide detailed (doxygen like) description of the of_thermal_get_ntrips()
>   method
> - Check for data pointer not being NULL
> ---
>  drivers/thermal/of-thermal.c   | 21 +++++++++++++++++++++
>  drivers/thermal/thermal_core.h |  5 +++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
> index b7982f0..7facd23 100644
> --- a/drivers/thermal/of-thermal.c
> +++ b/drivers/thermal/of-thermal.c
> @@ -112,6 +112,27 @@ static int of_thermal_get_temp(struct thermal_zone_device *tz,
>  	return data->ops->get_temp(data->sensor_data, temp);
>  }
>  
> +/**
> + * of_thermal_get_ntrips - function to export number of available trip
> + *			   points.
> + * @tz: pointer to a thermal zone
> + *
> + * This function is a globally visible wrapper to get number of trip points
> + * stored in the local struct __thermal_zone
> + *
> + * Return: number of available trip points, -ENODEV when data not available
> + */
> +int of_thermal_get_ntrips(struct thermal_zone_device *tz)
> +{
> +	struct __thermal_zone *data = tz->devdata;
> +
> +	if (!data || IS_ERR(data))
> +		return -ENODEV;
> +
> +	return data->ntrips;
> +}
> +EXPORT_SYMBOL_GPL(of_thermal_get_ntrips);
> +
>  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 d15d243..1cc5041 100644
> --- a/drivers/thermal/thermal_core.h
> +++ b/drivers/thermal/thermal_core.h
> @@ -89,9 +89,14 @@ static inline void thermal_gov_user_space_unregister(void) {}
>  #ifdef CONFIG_THERMAL_OF
>  int of_parse_thermal_zones(void);
>  void of_thermal_destroy_zones(void);
> +int of_thermal_get_ntrips(struct thermal_zone_device *);

Lukasz,

Here is a question that applies to all patches in this series adding
functions in this header.

i suppose you intend to use these new functions in driver code, right?
Add them here, will limit their usage to code inside drivers/thermal.

Shouldn't these new APIs be declared under include/linux/thermal.h?

This way, they can be be available to other parts of the kernel too.


>  #else
>  static inline int of_parse_thermal_zones(void) { return 0; }
>  static inline void of_thermal_destroy_zones(void) { }
> +static inline int of_thermal_get_ntrips(struct thermal_zone_device *tz)
> +{
> +	return 0;
> +}
>  #endif
>  
>  #endif /* __THERMAL_CORE_H__ */
> -- 
> 2.0.0.rc2
> 

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