linux-kernel - Re: [PATCH 09/13] thermal: of: always set sensor related callbacks

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Message-ID: <20150414105419.GK4946@pengutronix.de>
Date:	Tue, 14 Apr 2015 12:54:19 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Eduardo Valentin <edubezval@...il.com>
Cc:	linux-pm@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
	linux-kernel@...r.kernel.org,
	Stephen Warren <swarren@...dotorg.org>,
	Mikko Perttunen <mikko.perttunen@...si.fi>,
	kernel@...gutronix.de, linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 09/13] thermal: of: always set sensor related callbacks

On Mon, Apr 06, 2015 at 08:25:23PM -0700, Eduardo Valentin wrote:
> On Thu, Mar 26, 2015 at 04:53:56PM +0100, Sascha Hauer wrote:
> > Now that the thermal core treats -ENOSYS like the callbacks were
> > not present at all we no longer have to overwrite the ops during
> > runtime but instead can always set them and return -ENOSYS if no
> > sensor is registered.
> > 
> > Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> > ---
> >  drivers/thermal/of-thermal.c | 18 +++++++++++-------
> >  1 file changed, 11 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
> > index b39e22f..df14fdd 100644
> > --- a/drivers/thermal/of-thermal.c
> > +++ b/drivers/thermal/of-thermal.c
> > @@ -91,7 +91,7 @@ static int of_thermal_get_temp(struct thermal_zone_device *tz,
> >  {
> >  	struct __thermal_zone *data = tz->devdata;
> >  
> > -	if (!data->ops->get_temp)
> > +	if (!data->ops)
> >  		return -EINVAL;
> >  
> >  	return data->ops->get_temp(data->sensor_data, temp);
> > @@ -178,7 +178,7 @@ static int of_thermal_set_emul_temp(struct thermal_zone_device *tz,
> >  	struct __thermal_zone *data = tz->devdata;
> >  
> >  	if (!data->ops || !data->ops->set_emul_temp)
> > -		return -EINVAL;
> > +		return -ENOSYS;
> >  
> >  	return data->ops->set_emul_temp(data->sensor_data, temp);
> >  }
> > @@ -189,8 +189,8 @@ static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
> >  	struct __thermal_zone *data = tz->devdata;
> >  	int r;
> >  
> > -	if (!data->ops->get_trend)
> > -		return -EINVAL;
> > +	if (!data->ops || !data->ops->get_trend)
> > +		return -ENOSYS;
> >  
> >  	r = data->ops->get_trend(data->sensor_data, trip, trend);
> >  	if (r)
> > @@ -366,6 +366,10 @@ static int of_thermal_get_crit_temp(struct thermal_zone_device *tz,
> >  }
> >  
> >  static struct thermal_zone_device_ops of_thermal_ops = {
> > +	.get_temp = of_thermal_get_temp,
> > +	.get_trend = of_thermal_get_trend,
> > +	.set_emul_temp = of_thermal_set_emul_temp,
> > +
> >  	.get_mode = of_thermal_get_mode,
> >  	.set_mode = of_thermal_set_mode,
> >  
> > @@ -399,13 +403,13 @@ thermal_zone_of_add_sensor(struct device_node *zone,
> >  	if (!ops)
> >  		return ERR_PTR(-EINVAL);
> >  
> > +	if (!ops->get_temp)
> > +		return ERR_PTR(-EINVAL);
> > +
> >  	mutex_lock(&tzd->lock);
> >  	tz->ops = ops;
> >  	tz->sensor_data = data;
> >  
> > -	tzd->ops->get_temp = of_thermal_get_temp;
> > -	tzd->ops->get_trend = of_thermal_get_trend;
> > -	tzd->ops->set_emul_temp = of_thermal_set_emul_temp;
> 
> You may want to update the thermal_zone_of_sensor_unregister too.

Ups, indeed. That hunk accidently went into a later patch.

Sascha

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