Date: Tue, 14 Apr 2015 12:48:36 +0200
From: Sascha Hauer <s.hauer@pengutronix.de>
To: Eduardo Valentin <edubezval@gmail.com>
Cc: linux-pm@vger.kernel.org, Zhang Rui <rui.zhang@intel.com>,
        linux-kernel@vger.kernel.org, Stephen Warren <swarren@wwwdotorg.org>,
        Mikko Perttunen <mikko.perttunen@kapsi.fi>, kernel@pengutronix.de,
        linux-mediatek@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 06/13] thermal: streamline get_trend callbacks
Message-ID: <20150414104836.GJ4946@pengutronix.de>
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On Mon, Apr 06, 2015 at 08:19:52PM -0700, Eduardo Valentin wrote:
> On Thu, Mar 26, 2015 at 04:53:53PM +0100, Sascha Hauer wrote:
> > The .get_trend callback in struct thermal_zone_device_ops has the prototype:
> > 
> > 	int (*get_trend) (struct thermal_zone_device *, int,
> > 			  enum thermal_trend *);
> > 
> > whereas the .get_trend callback in struct thermal_zone_of_device_ops has:
> > 
> > 	int (*get_trend)(void *, long *);
> > 
> > Streamline both prototypes and add the trip argument to the OF callback
> > aswell and use enum thermal_trend * instead of an integer pointer.
> > 
> > While the OF prototype may be the better one, this should be decided at
> > framework level and not on OF level.
> > 
> > Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> > ---
> >  drivers/thermal/of-thermal.c                       | 11 +---------
> >  drivers/thermal/ti-soc-thermal/ti-thermal-common.c | 25 +++++++---------------
> >  include/linux/thermal.h                            |  2 +-
> >  3 files changed, 10 insertions(+), 28 deletions(-)
> > 
> > diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
> > index 668fb1b..b39e22f 100644
> > --- a/drivers/thermal/of-thermal.c
> > +++ b/drivers/thermal/of-thermal.c
> > @@ -187,24 +187,15 @@ static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
> >  				enum thermal_trend *trend)
> >  {
> >  	struct __thermal_zone *data = tz->devdata;
> > -	long dev_trend;
> >  	int r;
> >  
> >  	if (!data->ops->get_trend)
> >  		return -EINVAL;
> >  
> > -	r = data->ops->get_trend(data->sensor_data, &dev_trend);
> > +	r = data->ops->get_trend(data->sensor_data, trip, trend);
> >  	if (r)
> >  		return r;
> >  
> > -	/* TODO: These intervals might have some thresholds, but in core code */
> > -	if (dev_trend > 0)
> > -		*trend = THERMAL_TREND_RAISING;
> > -	else if (dev_trend < 0)
> > -		*trend = THERMAL_TREND_DROPPING;
> > -	else
> > -		*trend = THERMAL_TREND_STABLE;
> > -
> >  	return 0;
> >  }
> >  
> > diff --git a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> > index a38c175..7f8e5f3 100644
> > --- a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> > +++ b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
> > @@ -238,7 +238,7 @@ static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal,
> >  	return 0;
> >  }
> >  
> > -static int __ti_thermal_get_trend(void *p, long *trend)
> > +static int __ti_thermal_get_trend(void *p, int trip, enum thermal_trend *trend)
> >  {
> >  	struct ti_thermal_data *data = p;
> >  	struct ti_bandgap *bgp;
> > @@ -251,22 +251,6 @@ static int __ti_thermal_get_trend(void *p, long *trend)
> >  	if (ret)
> >  		return ret;
> >  
> > -	*trend = tr;
> > -
> > -	return 0;
> > -}
> > -
> > -/* Get the temperature trend callback functions for thermal zone */
> > -static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
> > -				int trip, enum thermal_trend *trend)
> > -{
> > -	int ret;
> > -	long tr;
> > -
> > -	ret = __ti_thermal_get_trend(thermal->devdata, &tr);
> > -	if (ret)
> > -		return ret;
> > -
> >  	if (tr > 0)
> >  		*trend = THERMAL_TREND_RAISING;
> >  	else if (tr < 0)
> > @@ -277,6 +261,13 @@ static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
> >  	return 0;
> >  }
> >  
> > +/* Get the temperature trend callback functions for thermal zone */
> > +static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
> > +				int trip, enum thermal_trend *trend)
> > +{
> > +	return __ti_thermal_get_trend(thermal->devdata, trip, trend);
> > +}
> > +
> >  /* Get critical temperature callback functions for thermal zone */
> >  static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal,
> >  				    unsigned long *temp)
> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > index db6c12b..ba2e29a 100644
> > --- a/include/linux/thermal.h
> > +++ b/include/linux/thermal.h
> > @@ -273,7 +273,7 @@ struct thermal_genl_event {
> >   */
> >  struct thermal_zone_of_device_ops {
> >  	int (*get_temp)(void *, long *);
> > -	int (*get_trend)(void *, long *);
> > +	int (*get_trend)(void *, int trend, enum thermal_trend *);
> 
> Could you please keep the kernel doc entry up to date?

What do you mean? The kernel doc entry for this function contains:

 * @get_trend: a pointer to a function that reads the sensor temperature trend.

This is still valid with my patch, so I might not understand what I
should keep up to date.

That said, the argument name above should be 'int trip', not 'int
trend'. I'll change that.

Sascha

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