[2/3] Thermal: core: Modify temp_crit_show() to use proper callback function.
diff mbox

Message ID 1368870656-1183-1-git-send-email-jonghwa3.lee@samsung.com
State Changes Requested
Delegated to: Zhang Rui
Headers show

Commit Message

Jonghwa Lee May 18, 2013, 9:50 a.m. UTC
This patch modifies temp_crit_show() which is used to create hwmon's sysfs
node to use .get_crit_temp callback function of thermal zone device rather
than .get_trip_temp.

Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
---
 drivers/thermal/thermal_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Zhang Rui May 20, 2013, 3:57 p.m. UTC | #1
> -----Original Message-----
> From: Jonghwa Lee [mailto:jonghwa3.lee@samsung.com]
> Sent: Saturday, May 18, 2013 5:51 PM
> To: linux-pm@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org; Zhang, Rui; Eduardo Valentin; Amit
> Dinel Kachhap; Jonghwa Lee; MyungJoo Ham
> Subject: [PATCH 2/3] Thermal: core: Modify temp_crit_show() to use
> proper callback function.
> Importance: High
> 
> This patch modifies temp_crit_show() which is used to create hwmon's
> sysfs node to use .get_crit_temp callback function of thermal zone
> device rather than .get_trip_temp.
> 
> Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>

The problem is that .get_crit_temp is optional for thermal drivers
that has a critical trip point.
At least we do not have such kind of check in thermal core.
Take rcar_thermal driver for example,
It supports critical trip point but it does not have .get_crit_type.

So I'd like to see a fix in rcar thermal driver and thermal core
for this issue, together with this patch.

Thanks,
rui
> ---
>  drivers/thermal/thermal_core.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/thermal_core.c
> b/drivers/thermal/thermal_core.c index f753f48..ce4384a 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -924,7 +924,7 @@ temp_crit_show(struct device *dev, struct
> device_attribute *attr,
>  	long temperature;
>  	int ret;
> 
> -	ret = tz->ops->get_trip_temp(tz, 0, &temperature);
> +	ret = tz->ops->get_crit_temp(tz, &temperature);
>  	if (ret)
>  		return ret;
> 
> --
> 1.7.9.5

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Jonghwa Lee May 21, 2013, 1:31 a.m. UTC | #2
On 2013? 05? 21? 00:57, Zhang, Rui wrote:

> 
> 
>> -----Original Message-----
>> From: Jonghwa Lee [mailto:jonghwa3.lee@samsung.com]
>> Sent: Saturday, May 18, 2013 5:51 PM
>> To: linux-pm@vger.kernel.org
>> Cc: linux-kernel@vger.kernel.org; Zhang, Rui; Eduardo Valentin; Amit
>> Dinel Kachhap; Jonghwa Lee; MyungJoo Ham
>> Subject: [PATCH 2/3] Thermal: core: Modify temp_crit_show() to use
>> proper callback function.
>> Importance: High
>>
>> This patch modifies temp_crit_show() which is used to create hwmon's
>> sysfs node to use .get_crit_temp callback function of thermal zone
>> device rather than .get_trip_temp.
>>
>> Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
>> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
> 
> The problem is that .get_crit_temp is optional for thermal drivers
> that has a critical trip point.


Actually, this is a interface for hwmon not generic thermal framework. And when
we create this node through the thermal_add_hwmon_sysfs(), we've already checked
whether call back function is available. So the problem won't happen.

Thanks
Jonghwa

> At least we do not have such kind of check in thermal core.
> Take rcar_thermal driver for example,
> It supports critical trip point but it does not have .get_crit_type.
> 
> So I'd like to see a fix in rcar thermal driver and thermal core
> for this issue, together with this patch.
> 
> Thanks,
> rui
>> ---
>>  drivers/thermal/thermal_core.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/thermal/thermal_core.c
>> b/drivers/thermal/thermal_core.c index f753f48..ce4384a 100644
>> --- a/drivers/thermal/thermal_core.c
>> +++ b/drivers/thermal/thermal_core.c
>> @@ -924,7 +924,7 @@ temp_crit_show(struct device *dev, struct
>> device_attribute *attr,
>>  	long temperature;
>>  	int ret;
>>
>> -	ret = tz->ops->get_trip_temp(tz, 0, &temperature);
>> +	ret = tz->ops->get_crit_temp(tz, &temperature);
>>  	if (ret)
>>  		return ret;
>>
>> --
>> 1.7.9.5
> 
> 


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Zhang Rui May 23, 2013, 2:19 a.m. UTC | #3
On Tue, 2013-05-21 at 10:31 +0900, jonghwa3.lee@samsung.com wrote:
> On 2013? 05? 21? 00:57, Zhang, Rui wrote:
> 
> > 
> > 
> >> -----Original Message-----
> >> From: Jonghwa Lee [mailto:jonghwa3.lee@samsung.com]
> >> Sent: Saturday, May 18, 2013 5:51 PM
> >> To: linux-pm@vger.kernel.org
> >> Cc: linux-kernel@vger.kernel.org; Zhang, Rui; Eduardo Valentin; Amit
> >> Dinel Kachhap; Jonghwa Lee; MyungJoo Ham
> >> Subject: [PATCH 2/3] Thermal: core: Modify temp_crit_show() to use
> >> proper callback function.
> >> Importance: High
> >>
> >> This patch modifies temp_crit_show() which is used to create hwmon's
> >> sysfs node to use .get_crit_temp callback function of thermal zone
> >> device rather than .get_trip_temp.
> >>
> >> Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
> >> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
> > 
> > The problem is that .get_crit_temp is optional for thermal drivers
> > that has a critical trip point.
> 
> 
> Actually, this is a interface for hwmon not generic thermal framework. And when
> we create this node through the thermal_add_hwmon_sysfs(), we've already checked
> whether call back function is available. So the problem won't happen.
> 
Oh, I see.

But back to my question, still take rcar driver for example,
it has a critical trip point but this is not shown in hwmon, which IMO
is still a problem.
So we should either make .get_crit_temp() mandatory for thermal drivers
with critical trip point or remove this callback and register hwmon
crit_temp interface via checking .get_trip_type().

thanks,
rui

> Thanks
> Jonghwa
> 
> > At least we do not have such kind of check in thermal core.
> > Take rcar_thermal driver for example,
> > It supports critical trip point but it does not have .get_crit_type.
> > 
> > So I'd like to see a fix in rcar thermal driver and thermal core
> > for this issue, together with this patch.
> > 
> > Thanks,
> > rui
> >> ---
> >>  drivers/thermal/thermal_core.c |    2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/thermal/thermal_core.c
> >> b/drivers/thermal/thermal_core.c index f753f48..ce4384a 100644
> >> --- a/drivers/thermal/thermal_core.c
> >> +++ b/drivers/thermal/thermal_core.c
> >> @@ -924,7 +924,7 @@ temp_crit_show(struct device *dev, struct
> >> device_attribute *attr,
> >>  	long temperature;
> >>  	int ret;
> >>
> >> -	ret = tz->ops->get_trip_temp(tz, 0, &temperature);
> >> +	ret = tz->ops->get_crit_temp(tz, &temperature);
> >>  	if (ret)
> >>  		return ret;
> >>
> >> --
> >> 1.7.9.5
> > 
> > 
> 
> 


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Patch
diff mbox

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index f753f48..ce4384a 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -924,7 +924,7 @@  temp_crit_show(struct device *dev, struct device_attribute *attr,
 	long temperature;
 	int ret;
 
-	ret = tz->ops->get_trip_temp(tz, 0, &temperature);
+	ret = tz->ops->get_crit_temp(tz, &temperature);
 	if (ret)
 		return ret;