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

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Date:   Tue, 8 Mar 2022 18:58:18 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Manaf Meethalavalappu Pallikunhi <quic_manafm@...cinc.com>,
        "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 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 ?


> +	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 */


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