[lm-sensors] [PATCH 3/3] thermal: update documentation

Jean Delvare khali at linux-fr.org
Mon Apr 7 12:00:29 CEST 2008


Hi Rui,

On Wed, 02 Apr 2008 16:09:12 +0800, Zhang, Rui wrote:
> 
> Update the documentation for the thermal driver hwmon sys I/F.

Looks good overall, suggested improvements inline.

> 
> Change the ACPI thermal zone type to be consistent with hwmon.
> 
> Signed-off-by: Zhang Rui <rui.zhang at intel.com>
> ---
>  Documentation/thermal/sysfs-api.txt |   31 +++++++++++++++++++++++++------
>  drivers/acpi/thermal.c              |    2 +-
>  2 files changed, 26 insertions(+), 7 deletions(-)
> 
> Index: linux-2.6/Documentation/thermal/sysfs-api.txt
> ===================================================================
> --- linux-2.6.orig/Documentation/thermal/sysfs-api.txt
> +++ linux-2.6/Documentation/thermal/sysfs-api.txt
> @@ -108,10 +108,11 @@ and throttle appropriate devices.
>  RO	read only value
>  RW	read/write value
>  
> -All thermal sysfs attributes will be represented under /sys/class/thermal
> +Thermal sysfs attributes will be represented under /sys/class/thermal and
> +/sys/class/hwmon.

and _optionally_ /sys/class/hwmon.

>  
>  Thermal zone device sys I/F, created once it's registered:
> -|thermal_zone[0-*]:
> +/sys/class/thermal/thermal_zone[0-*]:
>  	|-----type:			Type of the thermal zone
>  	|-----temp:			Current temperature
>  	|-----mode:			Working mode of the thermal zone
> @@ -119,7 +120,7 @@ Thermal zone device sys I/F, created onc
>  	|-----trip_point_[0-*]_type:	Trip point type
>  
>  Thermal cooling device sys I/F, created once it's registered:
> -|cooling_device[0-*]:
> +/sys/class/thermal/cooling_device[0-*]:
>  	|-----type :			Type of the cooling device(processor/fan/...)
>  	|-----max_state:		Maximum cooling state of the cooling device
>  	|-----cur_state:		Current cooling state of the cooling device
> @@ -130,10 +131,18 @@ They represent the relationship between 
>  They are created/removed for each
>  thermal_zone_bind_cooling_device/thermal_zone_unbind_cooling_device successful execution.
>  
> -|thermal_zone[0-*]
> +/sys/class/thermal/thermal_zone[0-*]
>  	|-----cdev[0-*]:		The [0-*]th cooling device in the current thermal zone
>  	|-----cdev[0-*]_trip_point:	Trip point that cdev[0-*] is associated with
>  
> +Besides the thermal zone device sys I/F and cooling device sys I/F,
> +the generic thermal driver also creates a hwmon sys I/F for each _type_ of
> +thermal zone device. E.g. one hwmon class device and the associated hwmon sys I/F
> +for all the registered ACPI thermal zones.

I suggest using the term "sysfs I/F" instead of "sys I/F", otherwise
it's not totally clear what you mean.

> +/sys/class/hwmon/hwmon[0-*]:
> +	|-----name:			The type of the thermal zone devices.
> +	|-----temp[1-*]_input:		The current temperature of thermal zone [1-*].
> +	|-----temp[1-*]_critical:	The critical trip point of thermal zone [1-*].

You may also point the reader to
<file:Documentation/hwmon/sysfs-interface> for additional information.

>  
>  ***************************
>  * Thermal zone attributes *
> @@ -141,7 +150,10 @@ thermal_zone_bind_cooling_device/thermal
>  
>  type				Strings which represent the thermal zone type.
>  				This is given by thermal zone driver as part of registration.
> -				Eg: "ACPI thermal zone" indicates it's a ACPI thermal device
> +				Eg: "acpitz" indicates it's an ACPI thermal device.
> +				In order to keep it consistent with hwmon sys attribute,
> +				this should be a short, lowercase string,
> +				not containing spaces nor dashes.
>  				RO
>  				Required
>  
> @@ -218,7 +230,7 @@ the sys I/F structure will be built like
>  /sys/class/thermal:
>  
>  |thermal_zone1:
> -	|-----type:			ACPI thermal zone
> +	|-----type:			acpitz
>  	|-----temp:			37000
>  	|-----mode:			kernel
>  	|-----trip_point_0_temp:	100000
> @@ -243,3 +255,10 @@ the sys I/F structure will be built like
>  	|-----type:			Fan
>  	|-----max_state:		2
>  	|-----cur_state:		0
> +
> +/sys/class/hwmon:
> +
> +|hwmon0:
> +	|-----name:			acpitz
> +	|-----temp1_input:		37000
> +	|-----temp1_crit:		100000
> Index: linux-2.6/drivers/acpi/thermal.c
> ===================================================================
> --- linux-2.6.orig/drivers/acpi/thermal.c
> +++ linux-2.6/drivers/acpi/thermal.c
> @@ -1123,7 +1123,7 @@ static int acpi_thermal_register_thermal
>  
>  	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
>  			tz->trips.active[i].flags.valid; i++, trips++);
> -	tz->thermal_zone = thermal_zone_device_register("ACPI thermal zone",
> +	tz->thermal_zone = thermal_zone_device_register("acpitz",
>  					trips, tz, &acpi_thermal_zone_ops);
>  	if (!tz->thermal_zone)
>  		return -ENODEV;
> 
> 


-- 
Jean Delvare




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