diff mbox

[02/13] Thermal: Move thermal_instance to thermal.h

Message ID 1344516365-7230-3-git-send-email-durgadoss.r@intel.com (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

durgadoss.r@intel.com Aug. 9, 2012, 12:45 p.m. UTC
This patch moves the thermal_instance structure
to thermal.h so that thermal management files
(other than thermal_sys.c) can also access it.

Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
---
 drivers/thermal/thermal_sys.c |   21 ---------------------
 include/linux/thermal.h       |   23 +++++++++++++++++++++++
 2 files changed, 23 insertions(+), 21 deletions(-)

Comments

Zhang, Rui Aug. 16, 2012, 6:14 a.m. UTC | #1
On ?, 2012-08-09 at 18:15 +0530, Durgadoss R wrote:
> This patch moves the thermal_instance structure
> to thermal.h so that thermal management files
> (other than thermal_sys.c) can also access it.
> 
> Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
> ---
>  drivers/thermal/thermal_sys.c |   21 ---------------------
>  include/linux/thermal.h       |   23 +++++++++++++++++++++++
>  2 files changed, 23 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index 5be8728..a0e20f9 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -41,27 +41,6 @@ MODULE_AUTHOR("Zhang Rui");
>  MODULE_DESCRIPTION("Generic thermal management sysfs support");
>  MODULE_LICENSE("GPL");
>  
> -#define THERMAL_NO_TARGET -1UL
> -/*
> - * This structure is used to describe the behavior of
> - * a certain cooling device on a certain trip point
> - * in a certain thermal zone
> - */
> -struct thermal_instance {
> -	int id;
> -	char name[THERMAL_NAME_LENGTH];
> -	struct thermal_zone_device *tz;
> -	struct thermal_cooling_device *cdev;
> -	int trip;
> -	unsigned long upper;	/* Highest cooling state for this trip point */
> -	unsigned long lower;	/* Lowest cooling state for this trip point */
> -	unsigned long target;	/* expected cooling state */
> -	char attr_name[THERMAL_NAME_LENGTH];
> -	struct device_attribute attr;
> -	struct list_head tz_node; /* node in tz->thermal_instances */
> -	struct list_head cdev_node; /* node in cdev->thermal_instances */
> -};
> -
>  static DEFINE_IDR(thermal_tz_idr);
>  static DEFINE_IDR(thermal_cdev_idr);
>  static DEFINE_MUTEX(thermal_idr_lock);
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 8611e3e..f25df23 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -33,6 +33,9 @@
>  #define THERMAL_MAX_TRIPS	12
>  #define THERMAL_NAME_LENGTH	20
>  
> +/* Initial state of a cooling device during binding */
> +#define THERMAL_NO_TARGET	-1UL
> +
>  /* No upper/lower limit requirement */
>  #define THERMAL_NO_LIMIT	-1UL
>  
> @@ -164,6 +167,26 @@ struct thermal_zone_device {
>  	struct delayed_work poll_queue;
>  };
>  
> +/*
> + * This structure is used to describe the behavior of
> + * a certain cooling device on a certain trip point
> + * in a certain thermal zone
> + */
> +struct thermal_instance {
> +	int id;
> +	char name[THERMAL_NAME_LENGTH];
> +	struct thermal_zone_device *tz;
> +	struct thermal_cooling_device *cdev;
> +	int trip;
> +	unsigned long upper;	/* Highest cooling state for this trip point */
> +	unsigned long lower;	/* Lowest cooling state for this trip point */
> +	unsigned long target;	/* expected cooling state */
> +	char attr_name[THERMAL_NAME_LENGTH];
> +	struct device_attribute attr;
> +	struct list_head tz_node; /* node in tz->thermal_instances */
> +	struct list_head cdev_node; /* node in cdev->thermal_instances */
> +};
> +

as this structure is used internally only, I'm thinking if we can rename
drivers/thermal/thermal_sys.c to drivers/thermal/thermal_core.c,
and introduce drivers/thermal/thermal_core.h for these internal stuff.
what do you think?

thanks,
rui
>  struct thermal_genl_event {
>  	u32 orig;
>  	enum events event;


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durgadoss.r@intel.com Aug. 16, 2012, 6:19 a.m. UTC | #2
Hi Rui,


> -----Original Message-----

> From: Zhang, Rui

> Sent: Thursday, August 16, 2012 11:44 AM

> To: R, Durgadoss

> Cc: lenb@kernel.org; rjw@sisk.pl; linux-acpi@vger.kernel.org; linux-

> pm@vger.kernel.org; eduardo.valentin@ti.com; amit.kachhap@linaro.org;

> wni@nvidia.com

> Subject: Re: [PATCH 02/13] Thermal: Move thermal_instance to thermal.h

> 

> On ?, 2012-08-09 at 18:15 +0530, Durgadoss R wrote:

> > This patch moves the thermal_instance structure

> > to thermal.h so that thermal management files

> > (other than thermal_sys.c) can also access it.

> >

> > Signed-off-by: Durgadoss R <durgadoss.r@intel.com>

> > ---

> >  drivers/thermal/thermal_sys.c |   21 ---------------------

> >  include/linux/thermal.h       |   23 +++++++++++++++++++++++

> >  2 files changed, 23 insertions(+), 21 deletions(-)

> >

> > diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c

> > index 5be8728..a0e20f9 100644

> > --- a/drivers/thermal/thermal_sys.c

> > +++ b/drivers/thermal/thermal_sys.c

> > @@ -41,27 +41,6 @@ MODULE_AUTHOR("Zhang Rui");

> >  MODULE_DESCRIPTION("Generic thermal management sysfs support");

> >  MODULE_LICENSE("GPL");

> >

> > -#define THERMAL_NO_TARGET -1UL

> > -/*

> > - * This structure is used to describe the behavior of

> > - * a certain cooling device on a certain trip point

> > - * in a certain thermal zone

> > - */

> > -struct thermal_instance {

> > -	int id;

> > -	char name[THERMAL_NAME_LENGTH];

> > -	struct thermal_zone_device *tz;

> > -	struct thermal_cooling_device *cdev;

> > -	int trip;

> > -	unsigned long upper;	/* Highest cooling state for this trip point */

> > -	unsigned long lower;	/* Lowest cooling state for this trip point */

> > -	unsigned long target;	/* expected cooling state */

> > -	char attr_name[THERMAL_NAME_LENGTH];

> > -	struct device_attribute attr;

> > -	struct list_head tz_node; /* node in tz->thermal_instances */

> > -	struct list_head cdev_node; /* node in cdev->thermal_instances */

> > -};

> > -

> >  static DEFINE_IDR(thermal_tz_idr);

> >  static DEFINE_IDR(thermal_cdev_idr);

> >  static DEFINE_MUTEX(thermal_idr_lock);

> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h

> > index 8611e3e..f25df23 100644

> > --- a/include/linux/thermal.h

> > +++ b/include/linux/thermal.h

> > @@ -33,6 +33,9 @@

> >  #define THERMAL_MAX_TRIPS	12

> >  #define THERMAL_NAME_LENGTH	20

> >

> > +/* Initial state of a cooling device during binding */

> > +#define THERMAL_NO_TARGET	-1UL

> > +

> >  /* No upper/lower limit requirement */

> >  #define THERMAL_NO_LIMIT	-1UL

> >

> > @@ -164,6 +167,26 @@ struct thermal_zone_device {

> >  	struct delayed_work poll_queue;

> >  };

> >

> > +/*

> > + * This structure is used to describe the behavior of

> > + * a certain cooling device on a certain trip point

> > + * in a certain thermal zone

> > + */

> > +struct thermal_instance {

> > +	int id;

> > +	char name[THERMAL_NAME_LENGTH];

> > +	struct thermal_zone_device *tz;

> > +	struct thermal_cooling_device *cdev;

> > +	int trip;

> > +	unsigned long upper;	/* Highest cooling state for this trip point */

> > +	unsigned long lower;	/* Lowest cooling state for this trip point */

> > +	unsigned long target;	/* expected cooling state */

> > +	char attr_name[THERMAL_NAME_LENGTH];

> > +	struct device_attribute attr;

> > +	struct list_head tz_node; /* node in tz->thermal_instances */

> > +	struct list_head cdev_node; /* node in cdev->thermal_instances */

> > +};

> > +

> 

> as this structure is used internally only, I'm thinking if we can rename

> drivers/thermal/thermal_sys.c to drivers/thermal/thermal_core.c,

> and introduce drivers/thermal/thermal_core.h for these internal stuff.

> what do you think?


Yes agree with you.
Also, we can keep the sysfs things in thermal_sys.c 
and rest of the things in thermal_core.c, and have a thermal_core.h also.
(This is how the power supply subsystem does it)

I will include this clean up, as part of v2, if you are Ok with this.

Other things;
 I was thinking is 'removal of netlink things' from
thermal_sys.c

Removing the hwmon related code (the thermal subsystem has grown
quite a bit and provides more thermal functionalities than Hwmon)
So, why do we need CONFIG_HWMON inside thermal subsystem ?
If all of us agree, I am Ok to remove this also.

Thanks,
Durga
Zhang, Rui Aug. 16, 2012, 6:29 a.m. UTC | #3
On ?, 2012-08-16 at 00:19 -0600, R, Durgadoss wrote:
> Hi Rui,
> 
> 
> > -----Original Message-----
> > From: Zhang, Rui
> > Sent: Thursday, August 16, 2012 11:44 AM
> > To: R, Durgadoss
> > Cc: lenb@kernel.org; rjw@sisk.pl; linux-acpi@vger.kernel.org; linux-
> > pm@vger.kernel.org; eduardo.valentin@ti.com; amit.kachhap@linaro.org;
> > wni@nvidia.com
> > Subject: Re: [PATCH 02/13] Thermal: Move thermal_instance to thermal.h
> > 
> > On ?, 2012-08-09 at 18:15 +0530, Durgadoss R wrote:
> > > This patch moves the thermal_instance structure
> > > to thermal.h so that thermal management files
> > > (other than thermal_sys.c) can also access it.
> > >
> > > Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
> > > ---
> > >  drivers/thermal/thermal_sys.c |   21 ---------------------
> > >  include/linux/thermal.h       |   23 +++++++++++++++++++++++
> > >  2 files changed, 23 insertions(+), 21 deletions(-)
> > >
> > > diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> > > index 5be8728..a0e20f9 100644
> > > --- a/drivers/thermal/thermal_sys.c
> > > +++ b/drivers/thermal/thermal_sys.c
> > > @@ -41,27 +41,6 @@ MODULE_AUTHOR("Zhang Rui");
> > >  MODULE_DESCRIPTION("Generic thermal management sysfs support");
> > >  MODULE_LICENSE("GPL");
> > >
> > > -#define THERMAL_NO_TARGET -1UL
> > > -/*
> > > - * This structure is used to describe the behavior of
> > > - * a certain cooling device on a certain trip point
> > > - * in a certain thermal zone
> > > - */
> > > -struct thermal_instance {
> > > -	int id;
> > > -	char name[THERMAL_NAME_LENGTH];
> > > -	struct thermal_zone_device *tz;
> > > -	struct thermal_cooling_device *cdev;
> > > -	int trip;
> > > -	unsigned long upper;	/* Highest cooling state for this trip point */
> > > -	unsigned long lower;	/* Lowest cooling state for this trip point */
> > > -	unsigned long target;	/* expected cooling state */
> > > -	char attr_name[THERMAL_NAME_LENGTH];
> > > -	struct device_attribute attr;
> > > -	struct list_head tz_node; /* node in tz->thermal_instances */
> > > -	struct list_head cdev_node; /* node in cdev->thermal_instances */
> > > -};
> > > -
> > >  static DEFINE_IDR(thermal_tz_idr);
> > >  static DEFINE_IDR(thermal_cdev_idr);
> > >  static DEFINE_MUTEX(thermal_idr_lock);
> > > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > > index 8611e3e..f25df23 100644
> > > --- a/include/linux/thermal.h
> > > +++ b/include/linux/thermal.h
> > > @@ -33,6 +33,9 @@
> > >  #define THERMAL_MAX_TRIPS	12
> > >  #define THERMAL_NAME_LENGTH	20
> > >
> > > +/* Initial state of a cooling device during binding */
> > > +#define THERMAL_NO_TARGET	-1UL
> > > +
> > >  /* No upper/lower limit requirement */
> > >  #define THERMAL_NO_LIMIT	-1UL
> > >
> > > @@ -164,6 +167,26 @@ struct thermal_zone_device {
> > >  	struct delayed_work poll_queue;
> > >  };
> > >
> > > +/*
> > > + * This structure is used to describe the behavior of
> > > + * a certain cooling device on a certain trip point
> > > + * in a certain thermal zone
> > > + */
> > > +struct thermal_instance {
> > > +	int id;
> > > +	char name[THERMAL_NAME_LENGTH];
> > > +	struct thermal_zone_device *tz;
> > > +	struct thermal_cooling_device *cdev;
> > > +	int trip;
> > > +	unsigned long upper;	/* Highest cooling state for this trip point */
> > > +	unsigned long lower;	/* Lowest cooling state for this trip point */
> > > +	unsigned long target;	/* expected cooling state */
> > > +	char attr_name[THERMAL_NAME_LENGTH];
> > > +	struct device_attribute attr;
> > > +	struct list_head tz_node; /* node in tz->thermal_instances */
> > > +	struct list_head cdev_node; /* node in cdev->thermal_instances */
> > > +};
> > > +
> > 
> > as this structure is used internally only, I'm thinking if we can rename
> > drivers/thermal/thermal_sys.c to drivers/thermal/thermal_core.c,
> > and introduce drivers/thermal/thermal_core.h for these internal stuff.
> > what do you think?
> 
> Yes agree with you.
> Also, we can keep the sysfs things in thermal_sys.c 
> and rest of the things in thermal_core.c, and have a thermal_core.h also.
> (This is how the power supply subsystem does it)
> 
> I will include this clean up, as part of v2, if you are Ok with this.
> 
yes, please go ahead.

> Other things;
>  I was thinking is 'removal of netlink things' from
> thermal_sys.c

and where to move it to?
> 
> Removing the hwmon related code (the thermal subsystem has grown
> quite a bit and provides more thermal functionalities than Hwmon)
> So, why do we need CONFIG_HWMON inside thermal subsystem ?
> If all of us agree, I am Ok to remove this also.
> 
we need Jean's opinion on this.
But anyway, we can do this at anytime, if really needed.

thanks,
rui

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durgadoss.r@intel.com Aug. 16, 2012, 6:31 a.m. UTC | #4
Hi Rui,

[cut.]
> > > > +/*

> > > > + * This structure is used to describe the behavior of

> > > > + * a certain cooling device on a certain trip point

> > > > + * in a certain thermal zone

> > > > + */

> > > > +struct thermal_instance {

> > > > +	int id;

> > > > +	char name[THERMAL_NAME_LENGTH];

> > > > +	struct thermal_zone_device *tz;

> > > > +	struct thermal_cooling_device *cdev;

> > > > +	int trip;

> > > > +	unsigned long upper;	/* Highest cooling state for this trip point */

> > > > +	unsigned long lower;	/* Lowest cooling state for this trip point */

> > > > +	unsigned long target;	/* expected cooling state */

> > > > +	char attr_name[THERMAL_NAME_LENGTH];

> > > > +	struct device_attribute attr;

> > > > +	struct list_head tz_node; /* node in tz->thermal_instances */

> > > > +	struct list_head cdev_node; /* node in cdev->thermal_instances */

> > > > +};

> > > > +

> > >

> > > as this structure is used internally only, I'm thinking if we can rename

> > > drivers/thermal/thermal_sys.c to drivers/thermal/thermal_core.c,

> > > and introduce drivers/thermal/thermal_core.h for these internal stuff.

> > > what do you think?

> >

> > Yes agree with you.

> > Also, we can keep the sysfs things in thermal_sys.c

> > and rest of the things in thermal_core.c, and have a thermal_core.h also.

> > (This is how the power supply subsystem does it)

> >

> > I will include this clean up, as part of v2, if you are Ok with this.

> >

> yes, please go ahead.


Ok. I will include this change.

> 

> > Other things;

> >  I was thinking is 'removal of netlink things' from

> > thermal_sys.c

> 

> and where to move it to?


I was thinking of completely removing this, as raw netlink
usage is phasing out, and kobj_uevent () is being used
increasingly.

But we will keep it as a separate change, and not club with this one.

> >

> > Removing the hwmon related code (the thermal subsystem has grown

> > quite a bit and provides more thermal functionalities than Hwmon)

> > So, why do we need CONFIG_HWMON inside thermal subsystem ?

> > If all of us agree, I am Ok to remove this also.

> >

> we need Jean's opinion on this.

> But anyway, we can do this at anytime, if really needed.


Yes, will wait for Jean's thoughts..

Thanks,
Durga

> 

> thanks,

> rui
Zhang, Rui Aug. 16, 2012, 7:12 a.m. UTC | #5
On ?, 2012-08-16 at 00:31 -0600, R, Durgadoss wrote:
> Hi Rui,
> 
> [cut.]
> > > > > +/*
> > > > > + * This structure is used to describe the behavior of
> > > > > + * a certain cooling device on a certain trip point
> > > > > + * in a certain thermal zone
> > > > > + */
> > > > > +struct thermal_instance {
> > > > > +	int id;
> > > > > +	char name[THERMAL_NAME_LENGTH];
> > > > > +	struct thermal_zone_device *tz;
> > > > > +	struct thermal_cooling_device *cdev;
> > > > > +	int trip;
> > > > > +	unsigned long upper;	/* Highest cooling state for this trip point */
> > > > > +	unsigned long lower;	/* Lowest cooling state for this trip point */
> > > > > +	unsigned long target;	/* expected cooling state */
> > > > > +	char attr_name[THERMAL_NAME_LENGTH];
> > > > > +	struct device_attribute attr;
> > > > > +	struct list_head tz_node; /* node in tz->thermal_instances */
> > > > > +	struct list_head cdev_node; /* node in cdev->thermal_instances */
> > > > > +};
> > > > > +
> > > >
> > > > as this structure is used internally only, I'm thinking if we can rename
> > > > drivers/thermal/thermal_sys.c to drivers/thermal/thermal_core.c,
> > > > and introduce drivers/thermal/thermal_core.h for these internal stuff.
> > > > what do you think?
> > >
> > > Yes agree with you.
> > > Also, we can keep the sysfs things in thermal_sys.c
> > > and rest of the things in thermal_core.c, and have a thermal_core.h also.
> > > (This is how the power supply subsystem does it)
> > >
> > > I will include this clean up, as part of v2, if you are Ok with this.
> > >
> > yes, please go ahead.
> 
> Ok. I will include this change.
> 
> > 
> > > Other things;
> > >  I was thinking is 'removal of netlink things' from
> > > thermal_sys.c
> > 
> > and where to move it to?
> 
> I was thinking of completely removing this, as raw netlink
> usage is phasing out, and kobj_uevent () is being used
> increasingly.
> 
> But we will keep it as a separate change, and not club with this one.
> 
We need to hold this for a while as I'm not sure if someone is using
this or not.
IMO, you can introduce a Config option to enable/disable the netlink
events for now, and marking it as deprecated.

thanks,
rui
> > >
> > > Removing the hwmon related code (the thermal subsystem has grown
> > > quite a bit and provides more thermal functionalities than Hwmon)
> > > So, why do we need CONFIG_HWMON inside thermal subsystem ?
> > > If all of us agree, I am Ok to remove this also.
> > >
> > we need Jean's opinion on this.
> > But anyway, we can do this at anytime, if really needed.
> 
> Yes, will wait for Jean's thoughts..
> 
> Thanks,
> Durga
> 
> > 
> > thanks,
> > rui


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Eduardo Valentin Aug. 20, 2012, 8:41 p.m. UTC | #6
Hello,

On Thu, Aug 16, 2012 at 03:12:32PM +0800, Zhang Rui wrote:
> On ?, 2012-08-16 at 00:31 -0600, R, Durgadoss wrote:
> > Hi Rui,
> > 
> > [cut.]
> > > > > > +/*
> > > > > > + * This structure is used to describe the behavior of
> > > > > > + * a certain cooling device on a certain trip point
> > > > > > + * in a certain thermal zone
> > > > > > + */
> > > > > > +struct thermal_instance {
> > > > > > +	int id;
> > > > > > +	char name[THERMAL_NAME_LENGTH];
> > > > > > +	struct thermal_zone_device *tz;
> > > > > > +	struct thermal_cooling_device *cdev;
> > > > > > +	int trip;
> > > > > > +	unsigned long upper;	/* Highest cooling state for this trip point */
> > > > > > +	unsigned long lower;	/* Lowest cooling state for this trip point */
> > > > > > +	unsigned long target;	/* expected cooling state */
> > > > > > +	char attr_name[THERMAL_NAME_LENGTH];
> > > > > > +	struct device_attribute attr;
> > > > > > +	struct list_head tz_node; /* node in tz->thermal_instances */
> > > > > > +	struct list_head cdev_node; /* node in cdev->thermal_instances */
> > > > > > +};
> > > > > > +
> > > > >
> > > > > as this structure is used internally only, I'm thinking if we can rename
> > > > > drivers/thermal/thermal_sys.c to drivers/thermal/thermal_core.c,
> > > > > and introduce drivers/thermal/thermal_core.h for these internal stuff.
> > > > > what do you think?
> > > >
> > > > Yes agree with you.
> > > > Also, we can keep the sysfs things in thermal_sys.c
> > > > and rest of the things in thermal_core.c, and have a thermal_core.h also.
> > > > (This is how the power supply subsystem does it)
> > > >
> > > > I will include this clean up, as part of v2, if you are Ok with this.
> > > >
> > > yes, please go ahead.

I also second this step. This split makes a lot of sense.

> > 
> > Ok. I will include this change.
> > 
> > > 
> > > > Other things;
> > > >  I was thinking is 'removal of netlink things' from
> > > > thermal_sys.c
> > > 
> > > and where to move it to?
> > 
> > I was thinking of completely removing this, as raw netlink
> > usage is phasing out, and kobj_uevent () is being used
> > increasingly.
> > 
> > But we will keep it as a separate change, and not club with this one.
> > 
> We need to hold this for a while as I'm not sure if someone is using
> this or not.
> IMO, you can introduce a Config option to enable/disable the netlink
> events for now, and marking it as deprecated.


At least from my side, I don't have any legacy application using the netlink :-)

How about you guys, what are the known applications using this link?

In any case, for me, at least we need to have a standard notification system,
for monitoring, debugging and also in case applications need to react on thermal
events.

> 
> thanks,
> rui
> > > >
> > > > Removing the hwmon related code (the thermal subsystem has grown
> > > > quite a bit and provides more thermal functionalities than Hwmon)
> > > > So, why do we need CONFIG_HWMON inside thermal subsystem ?
> > > > If all of us agree, I am Ok to remove this also.
> > > >
> > > we need Jean's opinion on this.
> > > But anyway, we can do this at anytime, if really needed.
> > 
> > Yes, will wait for Jean's thoughts..

What where the original design decisions to have these two linked together?

> > 
> > Thanks,
> > Durga
> > 
> > > 
> > > thanks,
> > > rui
> 
> 
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diff mbox

Patch

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 5be8728..a0e20f9 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -41,27 +41,6 @@  MODULE_AUTHOR("Zhang Rui");
 MODULE_DESCRIPTION("Generic thermal management sysfs support");
 MODULE_LICENSE("GPL");
 
-#define THERMAL_NO_TARGET -1UL
-/*
- * This structure is used to describe the behavior of
- * a certain cooling device on a certain trip point
- * in a certain thermal zone
- */
-struct thermal_instance {
-	int id;
-	char name[THERMAL_NAME_LENGTH];
-	struct thermal_zone_device *tz;
-	struct thermal_cooling_device *cdev;
-	int trip;
-	unsigned long upper;	/* Highest cooling state for this trip point */
-	unsigned long lower;	/* Lowest cooling state for this trip point */
-	unsigned long target;	/* expected cooling state */
-	char attr_name[THERMAL_NAME_LENGTH];
-	struct device_attribute attr;
-	struct list_head tz_node; /* node in tz->thermal_instances */
-	struct list_head cdev_node; /* node in cdev->thermal_instances */
-};
-
 static DEFINE_IDR(thermal_tz_idr);
 static DEFINE_IDR(thermal_cdev_idr);
 static DEFINE_MUTEX(thermal_idr_lock);
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 8611e3e..f25df23 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -33,6 +33,9 @@ 
 #define THERMAL_MAX_TRIPS	12
 #define THERMAL_NAME_LENGTH	20
 
+/* Initial state of a cooling device during binding */
+#define THERMAL_NO_TARGET	-1UL
+
 /* No upper/lower limit requirement */
 #define THERMAL_NO_LIMIT	-1UL
 
@@ -164,6 +167,26 @@  struct thermal_zone_device {
 	struct delayed_work poll_queue;
 };
 
+/*
+ * This structure is used to describe the behavior of
+ * a certain cooling device on a certain trip point
+ * in a certain thermal zone
+ */
+struct thermal_instance {
+	int id;
+	char name[THERMAL_NAME_LENGTH];
+	struct thermal_zone_device *tz;
+	struct thermal_cooling_device *cdev;
+	int trip;
+	unsigned long upper;	/* Highest cooling state for this trip point */
+	unsigned long lower;	/* Lowest cooling state for this trip point */
+	unsigned long target;	/* expected cooling state */
+	char attr_name[THERMAL_NAME_LENGTH];
+	struct device_attribute attr;
+	struct list_head tz_node; /* node in tz->thermal_instances */
+	struct list_head cdev_node; /* node in cdev->thermal_instances */
+};
+
 struct thermal_genl_event {
 	u32 orig;
 	enum events event;