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Date:	Thu, 23 Feb 2012 06:46:32 +0000
From:	"R, Durgadoss" <durgadoss.r@...el.com>
To:	Amit Daniel Kachhap <amit.kachhap@...aro.org>,
	"linux-pm@...ts.linux-foundation.org" 
	<linux-pm@...ts.linux-foundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mjg59@...f.ucam.org" <mjg59@...f.ucam.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"lenb@...nel.org" <lenb@...nel.org>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
	"rob.lee@...aro.org" <rob.lee@...aro.org>,
	"patches@...aro.org" <patches@...aro.org>
Subject: RE: [PATCH 1/4] thermal: Add a new trip type to use cooling device
 instance number

Hi Amit,

> -----Original Message-----
> From: amit kachhap [mailto:amitdanielk@...il.com] On Behalf Of Amit Daniel
> Kachhap
> Sent: Wednesday, February 22, 2012 3:44 PM
> To: linux-pm@...ts.linux-foundation.org
> Cc: linux-kernel@...r.kernel.org; mjg59@...f.ucam.org; linux-
> acpi@...r.kernel.org; lenb@...nel.org; linaro-dev@...ts.linaro.org;
> amit.kachhap@...aro.org; R, Durgadoss; rob.lee@...aro.org; patches@...aro.org
> Subject: [PATCH 1/4] thermal: Add a new trip type to use cooling device
> instance number
> 
> This patch adds a new trip type THERMAL_TRIP_STATE_ACTIVE. This
> trip behaves same as THERMAL_TRIP_ACTIVE but also passes the cooling
> device instance number. This helps the cooling device registered as
> different instances to perform appropriate cooling action decision in
> the set_cur_state call back function.
> 
> Also since the trip temperature's are in ascending order so some logic
> is put in place to skip the un-necessary checks.
> 
> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@...aro.org>
> ---
>  Documentation/thermal/sysfs-api.txt |    4 +-
>  drivers/thermal/thermal_sys.c       |   45 ++++++++++++++++++++++++++++++++--
>  include/linux/thermal.h             |    1 +
>  3 files changed, 45 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-
> api.txt
> index 1733ab9..7a0c080 100644
> --- a/Documentation/thermal/sysfs-api.txt
> +++ b/Documentation/thermal/sysfs-api.txt
> @@ -184,8 +184,8 @@ trip_point_[0-*]_temp
> 
>  trip_point_[0-*]_type
>  	Strings which indicate the type of the trip point.
> -	E.g. it can be one of critical, hot, passive, active[0-*] for ACPI
> -	thermal zone.
> +	E.g. it can be one of critical, hot, passive, active[0-1],
> +	state-active[0-*] for ACPI thermal zone.
>  	RO, Optional
> 
>  cdev[0-*]
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index 220ce7e..d4c9b20 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -192,6 +192,8 @@ trip_point_type_show(struct device *dev, struct
> device_attribute *attr,
>  		return sprintf(buf, "passive\n");
>  	case THERMAL_TRIP_ACTIVE:
>  		return sprintf(buf, "active\n");
> +	case THERMAL_TRIP_STATE_ACTIVE:
> +		return sprintf(buf, "state-active\n");
>  	default:
>  		return sprintf(buf, "unknown\n");
>  	}
> @@ -1034,10 +1036,10 @@ EXPORT_SYMBOL(thermal_cooling_device_unregister);
> 
>  void thermal_zone_device_update(struct thermal_zone_device *tz)
>  {
> -	int count, ret = 0;
> -	long temp, trip_temp;
> +	int count, ret = 0, inst_id;
> +	long temp, trip_temp, max_state, last_trip_change = 0;
>  	enum thermal_trip_type trip_type;
> -	struct thermal_cooling_device_instance *instance;
> +	struct thermal_cooling_device_instance *instance, *state_instance;
>  	struct thermal_cooling_device *cdev;
> 
>  	mutex_lock(&tz->lock);
> @@ -1086,6 +1088,43 @@ void thermal_zone_device_update(struct
> thermal_zone_device *tz)
>  					cdev->ops->set_cur_state(cdev, 0);
>  			}
>  			break;
> +		case THERMAL_TRIP_STATE_ACTIVE:
> +			list_for_each_entry(instance, &tz->cooling_devices,
> +					    node) {
> +				if (instance->trip != count)
> +					continue;
> +
> +				if (temp <= last_trip_change)
> +					continue;
> +
> +				inst_id = 0;
> +				/*
> +				*For this instance how many instance of same
> +				*cooling device occured before
> +				*/
> +
> +				list_for_each_entry(state_instance,
> +						&tz->cooling_devices, node) {
> +					if (instance->cdev ==
> +							state_instance->cdev)
> +						inst_id++;
> +					if (state_instance->trip == count)
> +						break;
> +				}

Can you explain a bit more on this loop and the set_cur_state below ?
Sorry, I don't get the logic behind this..

Thanks,
Durga

> +
> +				cdev = instance->cdev;
> +				cdev->ops->get_max_state(cdev, &max_state);
> +
> +				if ((temp >= trip_temp) &&
> +						(inst_id <= max_state))
> +					cdev->ops->set_cur_state(cdev, inst_id);
> +				else if ((temp < trip_temp) &&
> +						(--inst_id <= max_state))
> +					cdev->ops->set_cur_state(cdev, inst_id);
> +
> +				last_trip_change = trip_temp;
> +			}
> +			break;
>  		case THERMAL_TRIP_PASSIVE:
>  			if (temp >= trip_temp || tz->passive)
>  				thermal_zone_device_passive(tz, temp,
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 796f1ff..8df901f 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -42,6 +42,7 @@ enum thermal_trip_type {
>  	THERMAL_TRIP_PASSIVE,
>  	THERMAL_TRIP_HOT,
>  	THERMAL_TRIP_CRITICAL,
> +	THERMAL_TRIP_STATE_ACTIVE,
>  };
> 
>  struct thermal_zone_device_ops {
> --
> 1.7.1

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