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Date: Sun, 3 Feb 2013 15:54:07 -0800
From: amit kachhap <amit.kachhap@...il.com>
To: Zhang Rui <rui.zhang@...el.com>
Cc: linux-pm@...r.kernel.org, jonghwa3.lee@...sung.com,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
durgadoss.r@...el.com
Subject: Re: [PATCH V2 1/2] thermal: sysfs: Add a new sysfs node emul_temp for
thermal emulation
On Fri, Feb 1, 2013 at 12:27 AM, Zhang Rui <rui.zhang@...el.com> wrote:
> On Sun, 2013-01-27 at 19:28 -0800, Amit Daniel Kachhap wrote:
>> This patch adds support to set the emulated temperature method in
>> thermal zone (sensor). After setting this feature thermal zone may
>> report this temperature and not the actual temperature. The emulation
>> implementation may be based on sensor capability through platform
>> specific handler or pure software emulation if no platform handler defined.
>>
>> This is useful in debugging different temperature threshold and its
>> associated cooling action. Critical threshold's cannot be emulated.
>> Writing 0 on this node should disable emulation.
>>
>> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
>> Acked-by: Kukjin Kim <kgene.kim@...sung.com>
>> ---
>>
>> Changes in V2:
>> * Added config option for enabling emulation support.
>> * Added s/w emulation if no platform handler registered.
>> * skip the critical trip point emulation
>>
>> This patchset is based on thermal maintainer next tree.
>> git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux.git next
>>
>> Documentation/thermal/sysfs-api.txt | 13 ++++++
>> drivers/thermal/Kconfig | 8 +++
>> drivers/thermal/thermal_sys.c | 82 ++++++++++++++++++++++++++++++-----
>> include/linux/thermal.h | 2 +
>> 4 files changed, 94 insertions(+), 11 deletions(-)
>>
>> diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
>> index 526d4b9..6859661 100644
>> --- a/Documentation/thermal/sysfs-api.txt
>> +++ b/Documentation/thermal/sysfs-api.txt
>> @@ -55,6 +55,8 @@ temperature) and throttle appropriate devices.
>> .get_trip_type: get the type of certain trip point.
>> .get_trip_temp: get the temperature above which the certain trip point
>> will be fired.
>> + .set_emul_temp: set the emulation temperature which helps in debugging
>> + different threshold temperature points.
>>
>> 1.1.2 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
>>
>> @@ -153,6 +155,7 @@ Thermal zone device sys I/F, created once it's registered:
>> |---trip_point_[0-*]_temp: Trip point temperature
>> |---trip_point_[0-*]_type: Trip point type
>> |---trip_point_[0-*]_hyst: Hysteresis value for this trip point
>> + |---emul_temp: Emulated temperature set node
>>
>> Thermal cooling device sys I/F, created once it's registered:
>> /sys/class/thermal/cooling_device[0-*]:
>> @@ -252,6 +255,16 @@ passive
>> Valid values: 0 (disabled) or greater than 1000
>> RW, Optional
>>
>> +emul_temp
>> + Interface to set the emulated temperature method in thermal zone
>> + (sensor). After setting this temperature, the thermal zone may pass
>> + this temperature to platform emulation function if registered or
>> + cache it locally. This is useful in debugging different temperature
>> + threshold and its associated cooling action. This is write only node
>> + and writing 0 on this node should disable emulation.
>> + Unit: millidegree Celsius
>> + WO, Optional
>> +
>> *****************************
>> * Cooling device attributes *
>> *****************************
>> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
>> index faf38c5..e4cf7fb 100644
>> --- a/drivers/thermal/Kconfig
>> +++ b/drivers/thermal/Kconfig
>> @@ -78,6 +78,14 @@ config CPU_THERMAL
>> and not the ACPI interface.
>> If you want this support, you should say Y here.
>>
>> +config THERMAL_EMULATION
>> + bool "Thermal emulation mode support"
>> + help
>> + Enable this option to make a emul_temp sysfs node in thermal zone
>> + directory to support temperature emulation. With emulation sysfs node,
>> + user can manually input temperature and test the different trip
>> + threshold behaviour for simulation purpose.
>> +
>> config SPEAR_THERMAL
>> bool "SPEAr thermal sensor driver"
>> depends on PLAT_SPEAR
>> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
>> index 0a1bf6b..59ba709 100644
>> --- a/drivers/thermal/thermal_sys.c
>> +++ b/drivers/thermal/thermal_sys.c
>> @@ -378,24 +378,57 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
>> monitor_thermal_zone(tz);
>> }
>>
>> +static int thermal_zone_get_temp(struct thermal_zone_device *tz,
>> + unsigned long *temp)
>> +{
>> + int ret = 0, count;
>> + unsigned long crit_temp = -1UL;
>> + enum thermal_trip_type type;
>> +
>> + mutex_lock(&tz->lock);
>> +
>> + if (tz->ops->get_temp)
>> + ret = tz->ops->get_temp(tz, temp);
> we do not need to do this check, .get_temp() should always be available.
>
> #ifdef CONFIG_THERMAL_EMUL
>> + else
>> + ret = -EPERM;
>> +
>> + if (!tz->emul_temperature)
>> + goto skip_emul;
>> +
>
>
>> + for (count = 0; count < tz->trips; count++) {
>> + ret = tz->ops->get_trip_type(tz, count, &type);
>> + if (!ret && type == THERMAL_TRIP_CRITICAL) {
>> + ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
>> + break;
>> + }
>> + }
>> +
>> + if (ret)
>> + goto skip_emul;
>> +
>> + if (*temp < crit_temp)
>> + *temp = tz->emul_temperature;
>> +
>> +skip_emul:
> #endif
Will re-send with this code in #ifdef
>
> or you can introduce get_emul_temp() instead.
>
>> + mutex_unlock(&tz->lock);
>> + return ret;
>> +}
>> +
>> static void update_temperature(struct thermal_zone_device *tz)
>> {
>> long temp;
>> int ret;
>>
>> - mutex_lock(&tz->lock);
>> -
>> - ret = tz->ops->get_temp(tz, &temp);
>> + ret = thermal_zone_get_temp(tz, &temp);
>> if (ret) {
>> dev_warn(&tz->device, "failed to read out thermal zone %d\n",
>> tz->id);
>> - goto exit;
>> + return;
>> }
>>
>> + mutex_lock(&tz->lock);
>> tz->last_temperature = tz->temperature;
>> tz->temperature = temp;
>> -
>> -exit:
>> mutex_unlock(&tz->lock);
>> }
>>
>> @@ -438,10 +471,7 @@ temp_show(struct device *dev, struct device_attribute *attr, char *buf)
>> long temperature;
>> int ret;
>>
>> - if (!tz->ops->get_temp)
>> - return -EPERM;
>> -
>> - ret = tz->ops->get_temp(tz, &temperature);
>> + ret = thermal_zone_get_temp(tz, &temperature);
>>
>> if (ret)
>> return ret;
>> @@ -701,6 +731,31 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
>> return sprintf(buf, "%s\n", tz->governor->name);
>> }
>>
>> +#ifdef CONFIG_THERMAL_EMULATION
>> +static ssize_t
>> +emul_temp_store(struct device *dev, struct device_attribute *attr,
>> + const char *buf, size_t count)
>> +{
>> + struct thermal_zone_device *tz = to_thermal_zone(dev);
>> + int ret = 0;
>> + unsigned long temperature;
>> +
>> + if (kstrtoul(buf, 10, &temperature))
>> + return -EINVAL;
>> +
>> + if (!tz->ops->set_emul_temp) {
>> + mutex_lock(&tz->lock);
>> + tz->emul_temperature = temperature;
>> + mutex_unlock(&tz->lock);
>> + } else {
>> + ret = tz->ops->set_emul_temp(tz, temperature);
>> + }
>> +
>> + return ret ? ret : count;
>> +}
>> +static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
>> +#endif/*CONFIG_THERMAL_EMULATION*/
>> +
>> static DEVICE_ATTR(type, 0444, type_show, NULL);
>> static DEVICE_ATTR(temp, 0444, temp_show, NULL);
>> static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
>> @@ -843,7 +898,7 @@ temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
>> temp_input);
>> struct thermal_zone_device *tz = temp->tz;
>>
>> - ret = tz->ops->get_temp(tz, &temperature);
>> + ret = thermal_zone_get_temp(tz, &temperature);
>>
>> if (ret)
>> return ret;
>> @@ -1596,6 +1651,11 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
>> goto unregister;
>> }
>>
>> +#ifdef CONFIG_THERMAL_EMULATION
>> + result = device_create_file(&tz->device, &dev_attr_emul_temp);
>> + if (result)
>> + goto unregister;
>> +#endif
>> /* Create policy attribute */
>> result = device_create_file(&tz->device, &dev_attr_policy);
>> if (result)
>> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
>> index 9b78f8c..f0bd7f9 100644
>> --- a/include/linux/thermal.h
>> +++ b/include/linux/thermal.h
>> @@ -123,6 +123,7 @@ struct thermal_zone_device_ops {
>> int (*set_trip_hyst) (struct thermal_zone_device *, int,
>> unsigned long);
>> int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
>> + int (*set_emul_temp) (struct thermal_zone_device *, unsigned long);
>> int (*get_trend) (struct thermal_zone_device *, int,
>> enum thermal_trend *);
>> int (*notify) (struct thermal_zone_device *, int,
>> @@ -165,6 +166,7 @@ struct thermal_zone_device {
>> int polling_delay;
>> int temperature;
>> int last_temperature;
>> + int emul_temperature;
>> int passive;
>> unsigned int forced_passive;
>> const struct thermal_zone_device_ops *ops;
> others look okay to me.
Thanks.
Amit
>
> thanks,
> rui
>
>
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