Date:   Fri, 23 Sep 2022 22:21:26 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>, rafael@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Amit Kucheria <amitk@...nel.org>
Subject: Re: [PATCH v4 03/30] thermal/core: Add a generic
 thermal_zone_set_trip() function

On Wed, 2022-09-21 at 11:42 +0200, Daniel Lezcano wrote:
> The thermal zone ops defines a set_trip callback where we can invoke
> the backend driver to set an interrupt for the next trip point
> temperature being crossed the way up or down, or setting the low
> level
> with the hysteresis.
> 
> The ops is only called from the thermal sysfs code where the
> userspace
> has the ability to modify a trip point characteristic.
> 
> With the effort of encapsulating the thermal framework core code,
> let's create a thermal_zone_set_trip() which is the writable side of
> the thermal_zone_get_trip() and put there all the ops encapsulation.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>

Reviewed-by: Zhang Rui <rui.zhang@...el.com>

thanks,
rui
> ---
>  drivers/thermal/thermal_core.c  | 44 ++++++++++++++++++++++++++++++
>  drivers/thermal/thermal_sysfs.c | 48 +++++++++++------------------
> ----
>  include/linux/thermal.h         |  3 +++
>  3 files changed, 63 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/thermal/thermal_core.c
> b/drivers/thermal/thermal_core.c
> index 381d85ec74a0..fa0f89a24b68 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -1183,6 +1183,50 @@ int thermal_zone_get_trip(struct
> thermal_zone_device *tz, int trip_id,
>  }
>  EXPORT_SYMBOL_GPL(thermal_zone_get_trip);
>  
> +int thermal_zone_set_trip(struct thermal_zone_device *tz, int
> trip_id,
> +			  const struct thermal_trip *trip)
> +{
> +	struct thermal_trip t;
> +	int ret = -EINVAL;
> +
> +	mutex_lock(&tz->lock);
> +
> +	if (!tz->ops->set_trip_temp && !tz->ops->set_trip_hyst && !tz-
> >trips)
> +		goto out;
> +
> +	ret = __thermal_zone_get_trip(tz, trip_id, &t);
> +	if (ret)
> +		goto out;
> +
> +	if ((t.temperature != trip->temperature) && tz->ops-
> >set_trip_temp) {
> +
> +		ret = tz->ops->set_trip_temp(tz, trip_id, trip-
> >temperature);
> +		if (ret)
> +			goto out;
> +	}
> +
> +	if ((t.hysteresis != trip->hysteresis) && tz->ops-
> >set_trip_hyst) {
> +
> +		ret = tz->ops->set_trip_hyst(tz, trip_id, trip-
> >hysteresis);
> +		if (ret)
> +			goto out;
> +	}
> +
> +	if (((t.temperature != trip->temperature) ||
> +	     (t.hysteresis != trip->hysteresis)) && tz->trips)
> +		tz->trips[trip_id] = *trip;
> +
> +out:
> +	mutex_unlock(&tz->lock);
> +
> +	if (!ret) {
> +		thermal_notify_tz_trip_change(tz->id, trip_id, trip-
> >type,
> +					      trip->temperature, trip-
> >hysteresis);
> +		thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
> +	}
> +	
> +	return ret;
> +}
>  
>  /**
>   * thermal_zone_device_register_with_trips() - register a new
> thermal zone device
> diff --git a/drivers/thermal/thermal_sysfs.c
> b/drivers/thermal/thermal_sysfs.c
> index 18cdd7cd0008..8d7b25ab67c2 100644
> --- a/drivers/thermal/thermal_sysfs.c
> +++ b/drivers/thermal/thermal_sysfs.c
> @@ -115,31 +115,20 @@ trip_point_temp_store(struct device *dev,
> struct device_attribute *attr,
>  	struct thermal_trip trip;
>  	int trip_id, ret;
>  
> -	if (!tz->ops->set_trip_temp && !tz->trips)
> -		return -EPERM;
> -
>  	if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) !=
> 1)
>  		return -EINVAL;
>  
> -	if (kstrtoint(buf, 10, &trip.temperature))
> -		return -EINVAL;
> -
> -	ret = tz->ops->set_trip_temp(tz, trip_id, trip.temperature);
> +	ret = thermal_zone_get_trip(tz, trip_id, &trip);
>  	if (ret)
>  		return ret;
>  
> -	if (tz->trips)
> -		tz->trips[trip_id].temperature = trip.temperature;
> +	if (kstrtoint(buf, 10, &trip.temperature))
> +		return -EINVAL;
>  
> -	ret = thermal_zone_get_trip(tz, trip_id, &trip);
> +	ret = thermal_zone_set_trip(tz, trip_id, &trip);
>  	if (ret)
>  		return ret;
>  
> -	thermal_notify_tz_trip_change(tz->id, trip_id, trip.type,
> -				      trip.temperature,
> trip.hysteresis);
> -
> -	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
> -
>  	return count;
>  }
>  
> @@ -166,29 +155,24 @@ trip_point_hyst_store(struct device *dev,
> struct device_attribute *attr,
>  		      const char *buf, size_t count)
>  {
>  	struct thermal_zone_device *tz = to_thermal_zone(dev);
> -	int trip, ret;
> -	int temperature;
> -
> -	if (!tz->ops->set_trip_hyst)
> -		return -EPERM;
> +	struct thermal_trip trip;
> +	int trip_id, ret;
>  
> -	if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
> +	if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip_id) !=
> 1)
>  		return -EINVAL;
>  
> -	if (kstrtoint(buf, 10, &temperature))
> -		return -EINVAL;
> +	ret = thermal_zone_get_trip(tz, trip_id, &trip);
> +	if (ret)
> +		return ret;
>  
> -	/*
> -	 * We are not doing any check on the 'temperature' value
> -	 * here. The driver implementing 'set_trip_hyst' has to
> -	 * take care of this.
> -	 */
> -	ret = tz->ops->set_trip_hyst(tz, trip, temperature);
> +	if (kstrtoint(buf, 10, &trip.hysteresis))
> +		return -EINVAL;
>  
> -	if (!ret)
> -		thermal_zone_set_trips(tz);
> +	ret = thermal_zone_set_trip(tz, trip_id, &trip);
> +	if (ret)
> +		return ret;
>  
> -	return ret ? ret : count;
> +	return count;
>  }
>  
>  static ssize_t
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 09dc09228717..5350a437f245 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -338,6 +338,9 @@ static inline void
> devm_thermal_of_zone_unregister(struct device *dev,
>  int thermal_zone_get_trip(struct thermal_zone_device *tz, int
> trip_id,
>  			  struct thermal_trip *trip);
>  
> +int thermal_zone_set_trip(struct thermal_zone_device *tz, int
> trip_id,
> +			  const struct thermal_trip *trip);
> +
>  int thermal_zone_get_num_trips(struct thermal_zone_device *tz);
>  
>  #ifdef CONFIG_THERMAL

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