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Date: Tue, 9 Jul 2013 16:04:29 +0000
From: "R, Durgadoss" <durgadoss.r@...el.com>
To: Eduardo Valentin <eduardo.valentin@...com>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"amit.daniel@...sung.com" <amit.daniel@...sung.com>
CC: "Zhang, Rui" <rui.zhang@...el.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC PATCH 1/4] thermal: hwmon: move hwmon support to single
file
Hi Eduardo,
> -----Original Message-----
> From: linux-pm-owner@...r.kernel.org [mailto:linux-pm-
> owner@...r.kernel.org] On Behalf Of Eduardo Valentin
> Sent: Tuesday, July 09, 2013 7:30 PM
> To: linux-pm@...r.kernel.org; R, Durgadoss; amit.daniel@...sung.com
> Cc: Zhang, Rui; Eduardo Valentin; linux-kernel@...r.kernel.org
> Subject: [RFC PATCH 1/4] thermal: hwmon: move hwmon support to single file
>
> In order to improve code organization, this patch
> moves the hwmon sysfs support to a file named
> thermal_hwmon. This helps to add extra support
> for hwmon without scrambling the code.
Nice clean up for thermal_core.c. +1 from me.
I am inclined to even remove the hwmon related code completely.
AFAIK, there are not many users of this config option.
However people are looking for the other option. If they have a
hwmon driver, how can it use the thermal framework with ease.
[like what you mentioned about this in 0/5]
Thanks,
Durga
>
> In order to do this move, the hwmon list head is now
> using its own locking. Before, the list used
> the global thermal locking.
>
> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: linux-pm@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Eduardo Valentin <eduardo.valentin@...com>
> ---
> drivers/thermal/Kconfig | 9 ++
> drivers/thermal/Makefile | 3 +
> drivers/thermal/thermal_core.c | 255 +-------------------------------------
> drivers/thermal/thermal_hwmon.c | 268
> ++++++++++++++++++++++++++++++++++++++++
> drivers/thermal/thermal_hwmon.h | 49 ++++++++
> 5 files changed, 330 insertions(+), 254 deletions(-)
> create mode 100644 drivers/thermal/thermal_hwmon.c
> create mode 100644 drivers/thermal/thermal_hwmon.h
>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index e988c81..7fb16bc 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -17,8 +17,17 @@ if THERMAL
>
> config THERMAL_HWMON
> bool
> + prompt "Expose thermal sensors as hwmon device"
> depends on HWMON=y || HWMON=THERMAL
> default y
> + help
> + In case a sensor is registered with the thermal
> + framework, this option will also register it
> + as a hwmon. The sensor will then have the common
> + hwmon sysfs interface.
> +
> + Say 'Y' here if you want all thermal sensors to
> + have hwmon sysfs interface too.
>
> choice
> prompt "Default Thermal governor"
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 67184a2..24cb894 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -5,6 +5,9 @@
> obj-$(CONFIG_THERMAL) += thermal_sys.o
> thermal_sys-y += thermal_core.o
>
> +# interface to/from other layers providing sensors
> +thermal_sys-$(CONFIG_THERMAL_HWMON) += thermal_hwmon.o
> +
> # governors
> thermal_sys-$(CONFIG_THERMAL_GOV_FAIR_SHARE) += fair_share.o
> thermal_sys-$(CONFIG_THERMAL_GOV_STEP_WISE) += step_wise.o
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index 1f02e8e..247528b 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -38,6 +38,7 @@
> #include <net/genetlink.h>
>
> #include "thermal_core.h"
> +#include "thermal_hwmon.h"
>
> MODULE_AUTHOR("Zhang Rui");
> MODULE_DESCRIPTION("Generic thermal management sysfs support");
> @@ -859,260 +860,6 @@ thermal_cooling_device_trip_point_show(struct device
> *dev,
>
> /* Device management */
>
> -#if defined(CONFIG_THERMAL_HWMON)
> -
> -/* hwmon sys I/F */
> -#include <linux/hwmon.h>
> -
> -/* thermal zone devices with the same type share one hwmon device */
> -struct thermal_hwmon_device {
> - char type[THERMAL_NAME_LENGTH];
> - struct device *device;
> - int count;
> - struct list_head tz_list;
> - struct list_head node;
> -};
> -
> -struct thermal_hwmon_attr {
> - struct device_attribute attr;
> - char name[16];
> -};
> -
> -/* one temperature input for each thermal zone */
> -struct thermal_hwmon_temp {
> - struct list_head hwmon_node;
> - struct thermal_zone_device *tz;
> - struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
> - struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
> -};
> -
> -static LIST_HEAD(thermal_hwmon_list);
> -
> -static ssize_t
> -name_show(struct device *dev, struct device_attribute *attr, char *buf)
> -{
> - struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
> - return sprintf(buf, "%s\n", hwmon->type);
> -}
> -static DEVICE_ATTR(name, 0444, name_show, NULL);
> -
> -static ssize_t
> -temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
> -{
> - long temperature;
> - int ret;
> - struct thermal_hwmon_attr *hwmon_attr
> - = container_of(attr, struct thermal_hwmon_attr, attr);
> - struct thermal_hwmon_temp *temp
> - = container_of(hwmon_attr, struct
> thermal_hwmon_temp,
> - temp_input);
> - struct thermal_zone_device *tz = temp->tz;
> -
> - ret = thermal_zone_get_temp(tz, &temperature);
> -
> - if (ret)
> - return ret;
> -
> - return sprintf(buf, "%ld\n", temperature);
> -}
> -
> -static ssize_t
> -temp_crit_show(struct device *dev, struct device_attribute *attr,
> - char *buf)
> -{
> - struct thermal_hwmon_attr *hwmon_attr
> - = container_of(attr, struct thermal_hwmon_attr, attr);
> - struct thermal_hwmon_temp *temp
> - = container_of(hwmon_attr, struct
> thermal_hwmon_temp,
> - temp_crit);
> - struct thermal_zone_device *tz = temp->tz;
> - long temperature;
> - int ret;
> -
> - ret = tz->ops->get_trip_temp(tz, 0, &temperature);
> - if (ret)
> - return ret;
> -
> - return sprintf(buf, "%ld\n", temperature);
> -}
> -
> -
> -static struct thermal_hwmon_device *
> -thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
> -{
> - struct thermal_hwmon_device *hwmon;
> -
> - mutex_lock(&thermal_list_lock);
> - list_for_each_entry(hwmon, &thermal_hwmon_list, node)
> - if (!strcmp(hwmon->type, tz->type)) {
> - mutex_unlock(&thermal_list_lock);
> - return hwmon;
> - }
> - mutex_unlock(&thermal_list_lock);
> -
> - return NULL;
> -}
> -
> -/* Find the temperature input matching a given thermal zone */
> -static struct thermal_hwmon_temp *
> -thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
> - const struct thermal_zone_device *tz)
> -{
> - struct thermal_hwmon_temp *temp;
> -
> - mutex_lock(&thermal_list_lock);
> - list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
> - if (temp->tz == tz) {
> - mutex_unlock(&thermal_list_lock);
> - return temp;
> - }
> - mutex_unlock(&thermal_list_lock);
> -
> - return NULL;
> -}
> -
> -static int
> -thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
> -{
> - struct thermal_hwmon_device *hwmon;
> - struct thermal_hwmon_temp *temp;
> - int new_hwmon_device = 1;
> - int result;
> -
> - hwmon = thermal_hwmon_lookup_by_type(tz);
> - if (hwmon) {
> - new_hwmon_device = 0;
> - goto register_sys_interface;
> - }
> -
> - hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
> - if (!hwmon)
> - return -ENOMEM;
> -
> - INIT_LIST_HEAD(&hwmon->tz_list);
> - strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
> - hwmon->device = hwmon_device_register(NULL);
> - if (IS_ERR(hwmon->device)) {
> - result = PTR_ERR(hwmon->device);
> - goto free_mem;
> - }
> - dev_set_drvdata(hwmon->device, hwmon);
> - result = device_create_file(hwmon->device, &dev_attr_name);
> - if (result)
> - goto free_mem;
> -
> - register_sys_interface:
> - temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
> - if (!temp) {
> - result = -ENOMEM;
> - goto unregister_name;
> - }
> -
> - temp->tz = tz;
> - hwmon->count++;
> -
> - snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
> - "temp%d_input", hwmon->count);
> - temp->temp_input.attr.attr.name = temp->temp_input.name;
> - temp->temp_input.attr.attr.mode = 0444;
> - temp->temp_input.attr.show = temp_input_show;
> - sysfs_attr_init(&temp->temp_input.attr.attr);
> - result = device_create_file(hwmon->device, &temp->temp_input.attr);
> - if (result)
> - goto free_temp_mem;
> -
> - if (tz->ops->get_crit_temp) {
> - unsigned long temperature;
> - if (!tz->ops->get_crit_temp(tz, &temperature)) {
> - snprintf(temp->temp_crit.name,
> - sizeof(temp->temp_crit.name),
> - "temp%d_crit", hwmon->count);
> - temp->temp_crit.attr.attr.name = temp-
> >temp_crit.name;
> - temp->temp_crit.attr.attr.mode = 0444;
> - temp->temp_crit.attr.show = temp_crit_show;
> - sysfs_attr_init(&temp->temp_crit.attr.attr);
> - result = device_create_file(hwmon->device,
> - &temp->temp_crit.attr);
> - if (result)
> - goto unregister_input;
> - }
> - }
> -
> - mutex_lock(&thermal_list_lock);
> - if (new_hwmon_device)
> - list_add_tail(&hwmon->node, &thermal_hwmon_list);
> - list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
> - mutex_unlock(&thermal_list_lock);
> -
> - return 0;
> -
> - unregister_input:
> - device_remove_file(hwmon->device, &temp->temp_input.attr);
> - free_temp_mem:
> - kfree(temp);
> - unregister_name:
> - if (new_hwmon_device) {
> - device_remove_file(hwmon->device, &dev_attr_name);
> - hwmon_device_unregister(hwmon->device);
> - }
> - free_mem:
> - if (new_hwmon_device)
> - kfree(hwmon);
> -
> - return result;
> -}
> -
> -static void
> -thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
> -{
> - struct thermal_hwmon_device *hwmon;
> - struct thermal_hwmon_temp *temp;
> -
> - hwmon = thermal_hwmon_lookup_by_type(tz);
> - if (unlikely(!hwmon)) {
> - /* Should never happen... */
> - dev_dbg(&tz->device, "hwmon device lookup failed!\n");
> - return;
> - }
> -
> - temp = thermal_hwmon_lookup_temp(hwmon, tz);
> - if (unlikely(!temp)) {
> - /* Should never happen... */
> - dev_dbg(&tz->device, "temperature input lookup failed!\n");
> - return;
> - }
> -
> - device_remove_file(hwmon->device, &temp->temp_input.attr);
> - if (tz->ops->get_crit_temp)
> - device_remove_file(hwmon->device, &temp->temp_crit.attr);
> -
> - mutex_lock(&thermal_list_lock);
> - list_del(&temp->hwmon_node);
> - kfree(temp);
> - if (!list_empty(&hwmon->tz_list)) {
> - mutex_unlock(&thermal_list_lock);
> - return;
> - }
> - list_del(&hwmon->node);
> - mutex_unlock(&thermal_list_lock);
> -
> - device_remove_file(hwmon->device, &dev_attr_name);
> - hwmon_device_unregister(hwmon->device);
> - kfree(hwmon);
> -}
> -#else
> -static int
> -thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
> -{
> - return 0;
> -}
> -
> -static void
> -thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
> -{
> -}
> -#endif
> -
> /**
> * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
> * @tz: pointer to struct thermal_zone_device
> diff --git a/drivers/thermal/thermal_hwmon.c
> b/drivers/thermal/thermal_hwmon.c
> new file mode 100644
> index 0000000..7c665c8
> --- /dev/null
> +++ b/drivers/thermal/thermal_hwmon.c
> @@ -0,0 +1,268 @@
> +/*
> + * thermal_hwmon.c - Generic Thermal Management hwmon support.
> + *
> + * Code based on Intel thermal_core.c. Copyrights of the original code:
> + * Copyright (C) 2008 Intel Corp
> + * Copyright (C) 2008 Zhang Rui <rui.zhang@...el.com>
> + * Copyright (C) 2008 Sujith Thomas <sujith.thomas@...el.com>
> + *
> + * Copyright (C) 2013 Texas Instruments
> + * Copyright (C) 2013 Eduardo Valentin <eduardo.valentin@...com>
> + *
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ~~~~~~~~~~~~
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
> + *
> + *
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ~~~~~~~~~~~~
> + */
> +#include <linux/hwmon.h>
> +#include <linux/thermal.h>
> +#include <linux/slab.h>
> +#include <linux/err.h>
> +
> +/* hwmon sys I/F */
> +/* thermal zone devices with the same type share one hwmon device */
> +struct thermal_hwmon_device {
> + char type[THERMAL_NAME_LENGTH];
> + struct device *device;
> + int count;
> + struct list_head tz_list;
> + struct list_head node;
> +};
> +
> +struct thermal_hwmon_attr {
> + struct device_attribute attr;
> + char name[16];
> +};
> +
> +/* one temperature input for each thermal zone */
> +struct thermal_hwmon_temp {
> + struct list_head hwmon_node;
> + struct thermal_zone_device *tz;
> + struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
> + struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
> +};
> +
> +static LIST_HEAD(thermal_hwmon_list);
> +
> +static DEFINE_MUTEX(thermal_hwmon_list_lock);
> +
> +static ssize_t
> +name_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
> + return sprintf(buf, "%s\n", hwmon->type);
> +}
> +static DEVICE_ATTR(name, 0444, name_show, NULL);
> +
> +static ssize_t
> +temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + long temperature;
> + int ret;
> + struct thermal_hwmon_attr *hwmon_attr
> + = container_of(attr, struct thermal_hwmon_attr, attr);
> + struct thermal_hwmon_temp *temp
> + = container_of(hwmon_attr, struct
> thermal_hwmon_temp,
> + temp_input);
> + struct thermal_zone_device *tz = temp->tz;
> +
> + ret = thermal_zone_get_temp(tz, &temperature);
> +
> + if (ret)
> + return ret;
> +
> + return sprintf(buf, "%ld\n", temperature);
> +}
> +
> +static ssize_t
> +temp_crit_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + struct thermal_hwmon_attr *hwmon_attr
> + = container_of(attr, struct thermal_hwmon_attr, attr);
> + struct thermal_hwmon_temp *temp
> + = container_of(hwmon_attr, struct
> thermal_hwmon_temp,
> + temp_crit);
> + struct thermal_zone_device *tz = temp->tz;
> + long temperature;
> + int ret;
> +
> + ret = tz->ops->get_trip_temp(tz, 0, &temperature);
> + if (ret)
> + return ret;
> +
> + return sprintf(buf, "%ld\n", temperature);
> +}
> +
> +
> +static struct thermal_hwmon_device *
> +thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
> +{
> + struct thermal_hwmon_device *hwmon;
> +
> + mutex_lock(&thermal_hwmon_list_lock);
> + list_for_each_entry(hwmon, &thermal_hwmon_list, node)
> + if (!strcmp(hwmon->type, tz->type)) {
> + mutex_unlock(&thermal_hwmon_list_lock);
> + return hwmon;
> + }
> + mutex_unlock(&thermal_hwmon_list_lock);
> +
> + return NULL;
> +}
> +
> +/* Find the temperature input matching a given thermal zone */
> +static struct thermal_hwmon_temp *
> +thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
> + const struct thermal_zone_device *tz)
> +{
> + struct thermal_hwmon_temp *temp;
> +
> + mutex_lock(&thermal_hwmon_list_lock);
> + list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
> + if (temp->tz == tz) {
> + mutex_unlock(&thermal_hwmon_list_lock);
> + return temp;
> + }
> + mutex_unlock(&thermal_hwmon_list_lock);
> +
> + return NULL;
> +}
> +
> +int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
> +{
> + struct thermal_hwmon_device *hwmon;
> + struct thermal_hwmon_temp *temp;
> + int new_hwmon_device = 1;
> + int result;
> +
> + hwmon = thermal_hwmon_lookup_by_type(tz);
> + if (hwmon) {
> + new_hwmon_device = 0;
> + goto register_sys_interface;
> + }
> +
> + hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
> + if (!hwmon)
> + return -ENOMEM;
> +
> + INIT_LIST_HEAD(&hwmon->tz_list);
> + strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
> + hwmon->device = hwmon_device_register(NULL);
> + if (IS_ERR(hwmon->device)) {
> + result = PTR_ERR(hwmon->device);
> + goto free_mem;
> + }
> + dev_set_drvdata(hwmon->device, hwmon);
> + result = device_create_file(hwmon->device, &dev_attr_name);
> + if (result)
> + goto free_mem;
> +
> + register_sys_interface:
> + temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
> + if (!temp) {
> + result = -ENOMEM;
> + goto unregister_name;
> + }
> +
> + temp->tz = tz;
> + hwmon->count++;
> +
> + snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
> + "temp%d_input", hwmon->count);
> + temp->temp_input.attr.attr.name = temp->temp_input.name;
> + temp->temp_input.attr.attr.mode = 0444;
> + temp->temp_input.attr.show = temp_input_show;
> + sysfs_attr_init(&temp->temp_input.attr.attr);
> + result = device_create_file(hwmon->device, &temp->temp_input.attr);
> + if (result)
> + goto free_temp_mem;
> +
> + if (tz->ops->get_crit_temp) {
> + unsigned long temperature;
> + if (!tz->ops->get_crit_temp(tz, &temperature)) {
> + snprintf(temp->temp_crit.name,
> + sizeof(temp->temp_crit.name),
> + "temp%d_crit", hwmon->count);
> + temp->temp_crit.attr.attr.name = temp-
> >temp_crit.name;
> + temp->temp_crit.attr.attr.mode = 0444;
> + temp->temp_crit.attr.show = temp_crit_show;
> + sysfs_attr_init(&temp->temp_crit.attr.attr);
> + result = device_create_file(hwmon->device,
> + &temp->temp_crit.attr);
> + if (result)
> + goto unregister_input;
> + }
> + }
> +
> + mutex_lock(&thermal_hwmon_list_lock);
> + if (new_hwmon_device)
> + list_add_tail(&hwmon->node, &thermal_hwmon_list);
> + list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
> + mutex_unlock(&thermal_hwmon_list_lock);
> +
> + return 0;
> +
> + unregister_input:
> + device_remove_file(hwmon->device, &temp->temp_input.attr);
> + free_temp_mem:
> + kfree(temp);
> + unregister_name:
> + if (new_hwmon_device) {
> + device_remove_file(hwmon->device, &dev_attr_name);
> + hwmon_device_unregister(hwmon->device);
> + }
> + free_mem:
> + if (new_hwmon_device)
> + kfree(hwmon);
> +
> + return result;
> +}
> +
> +void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
> +{
> + struct thermal_hwmon_device *hwmon;
> + struct thermal_hwmon_temp *temp;
> +
> + hwmon = thermal_hwmon_lookup_by_type(tz);
> + if (unlikely(!hwmon)) {
> + /* Should never happen... */
> + dev_dbg(&tz->device, "hwmon device lookup failed!\n");
> + return;
> + }
> +
> + temp = thermal_hwmon_lookup_temp(hwmon, tz);
> + if (unlikely(!temp)) {
> + /* Should never happen... */
> + dev_dbg(&tz->device, "temperature input lookup failed!\n");
> + return;
> + }
> +
> + device_remove_file(hwmon->device, &temp->temp_input.attr);
> + if (tz->ops->get_crit_temp)
> + device_remove_file(hwmon->device, &temp->temp_crit.attr);
> +
> + mutex_lock(&thermal_hwmon_list_lock);
> + list_del(&temp->hwmon_node);
> + kfree(temp);
> + if (!list_empty(&hwmon->tz_list)) {
> + mutex_unlock(&thermal_hwmon_list_lock);
> + return;
> + }
> + list_del(&hwmon->node);
> + mutex_unlock(&thermal_hwmon_list_lock);
> +
> + device_remove_file(hwmon->device, &dev_attr_name);
> + hwmon_device_unregister(hwmon->device);
> + kfree(hwmon);
> +}
> diff --git a/drivers/thermal/thermal_hwmon.h
> b/drivers/thermal/thermal_hwmon.h
> new file mode 100644
> index 0000000..c798fdb
> --- /dev/null
> +++ b/drivers/thermal/thermal_hwmon.h
> @@ -0,0 +1,49 @@
> +/*
> + * thermal_hwmon.h - Generic Thermal Management hwmon support.
> + *
> + * Code based on Intel thermal_core.c. Copyrights of the original code:
> + * Copyright (C) 2008 Intel Corp
> + * Copyright (C) 2008 Zhang Rui <rui.zhang@...el.com>
> + * Copyright (C) 2008 Sujith Thomas <sujith.thomas@...el.com>
> + *
> + * Copyright (C) 2013 Texas Instruments
> + * Copyright (C) 2013 Eduardo Valentin <eduardo.valentin@...com>
> + *
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ~~~~~~~~~~~~
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
> + *
> + *
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ~~~~~~~~~~~~
> + */
> +#ifndef __THERMAL_HWMON_H__
> +#define __THERMAL_HWMON_H__
> +
> +#include <linux/thermal.h>
> +
> +#ifdef CONFIG_THERMAL_HWMON
> +int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz);
> +void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz);
> +#else
> +static int
> +thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
> +{
> + return 0;
> +}
> +
> +static void
> +thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
> +{
> +}
> +#endif
> +
> +#endif /* __THERMAL_HWMON_H__ */
> --
> 1.8.2.1.342.gfa7285d
>
> --
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