linux-kernel - Re: [PATCH] drivers/thermal/thermal_of: Add change_mode ops support for thermal

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Message-ID: <27a01b22-1db7-5e5a-212d-092cedfaa50f@quicinc.com>
Date:   Wed, 9 Mar 2022 00:37:35 +0530
From:   Manaf Meethalavalappu Pallikunhi <quic_manafm@...cinc.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>
CC:     <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/thermal/thermal_of: Add change_mode ops support
 for thermal_of sensor


On 3/8/2022 11:28 PM, Daniel Lezcano wrote:
> On 08/03/2022 16:20, Manaf Meethalavalappu Pallikunhi wrote:
>> The sensor driver which register through thermal_of interface doesn't
>> have an option to get thermal zone mode change notification from
>> thermal core.
>>
>> Add support for change_mode ops in thermal_of interface so that sensor
>> driver can use this ops for mode change notification.
>>
>> Signed-off-by: Manaf Meethalavalappu Pallikunhi 
>> <quic_manafm@...cinc.com>
>> ---
>>   drivers/thermal/thermal_of.c | 14 ++++++++++++++
>>   include/linux/thermal.h      |  3 +++
>>   2 files changed, 17 insertions(+)
>>
>> diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
>> index 9233f7e..a4e3820 100644
>> --- a/drivers/thermal/thermal_of.c
>> +++ b/drivers/thermal/thermal_of.c
>> @@ -203,6 +203,17 @@ static int of_thermal_get_trend(struct 
>> thermal_zone_device *tz, int trip,
>>       return data->ops->get_trend(data->sensor_data, trip, trend);
>>   }
>>   +static int of_thermal_change_mode(struct thermal_zone_device *tz,
>> +                enum thermal_device_mode mode)
>> +{
>> +    struct __thermal_zone *data = tz->devdata;
>> +
>> +    if (!data->ops || !data->ops->change_mode)
>> +        return -EINVAL;
>
>
> If this function is called it is because below in the bind function 
> ops->change_mode was true, so the condition above is always true, no ?

I agree, it is reduntant. I just followed other ops similar sanity 
check. I will remove it in next revision.

I think I missed to clear tzd->ops->change_mode  in 
tz_of_sensor_unregister() path. I will update that as well

>
>
>> +    return data->ops->change_mode(data->sensor_data, mode);
>> +}
>> +
>>   static int of_thermal_bind(struct thermal_zone_device *thermal,
>>                  struct thermal_cooling_device *cdev)
>>   {
>> @@ -408,6 +419,9 @@ thermal_zone_of_add_sensor(struct device_node *zone,
>>       if (ops->set_emul_temp)
>>           tzd->ops->set_emul_temp = of_thermal_set_emul_temp;
>>   +    if (ops->change_mode)
>> +        tzd->ops->change_mode = of_thermal_change_mode;
>> +
>>       mutex_unlock(&tzd->lock);
>>         return tzd;
>> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
>> index c3148939..365733b 100644
>> --- a/include/linux/thermal.h
>> +++ b/include/linux/thermal.h
>> @@ -299,6 +299,8 @@ struct thermal_zone_params {
>>    *           temperature.
>>    * @set_trip_temp: a pointer to a function that sets the trip 
>> temperature on
>>    *           hardware.
>> + * @change_mode: a pointer to a function that notifies the thermal zone
>> + *           mode change.
>>    */
>>   struct thermal_zone_of_device_ops {
>>       int (*get_temp)(void *, int *);
>> @@ -306,6 +308,7 @@ struct thermal_zone_of_device_ops {
>>       int (*set_trips)(void *, int, int);
>>       int (*set_emul_temp)(void *, int);
>>       int (*set_trip_temp)(void *, int, int);
>> +    int (*change_mode) (void *, enum thermal_device_mode);
>>   };
>>     /* Function declarations */
>
>