thermal: core: export apis to get slope and offset

Add apis for platform thermal drivers to query for slope and offset
attributes, which might be needed for temperature calculations.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index efc3f3d293c499d479e0c558837157caca5d0352..755476ea3fda525b15647c4903de9bc2e10c5894 100644 (file)
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -140,6 +140,18 @@ temperature) and throttle appropriate devices.
        Normally this function will not need to be called and the resource
        management code will ensure that the resource is freed.
 
+1.1.7 int thermal_zone_get_slope(struct thermal_zone_device *tz)
+
+       This interface is used to read the slope attribute value
+       for the thermal zone device, which might be useful for platform
+       drivers for temperature calculations.
+
+1.1.8 int thermal_zone_get_offset(struct thermal_zone_device *tz)
+
+       This interface is used to read the offset attribute value
+       for the thermal zone device, which might be useful for platform
+       drivers for temperature calculations.
+
 1.2 thermal cooling device interface
 1.2.1 struct thermal_cooling_device *thermal_cooling_device_register(char *name,
                void *devdata, struct thermal_cooling_device_ops *)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index e2fc6161dded9650c300cf829a381c0a2d14b38c..8728cc61545291413e0e8e88261f589569cdcddc 100644 (file)
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -2069,6 +2069,36 @@ exit:
 }
 EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
 
+/**
+ * thermal_zone_get_slope - return the slope attribute of the thermal zone
+ * @tz: thermal zone device with the slope attribute
+ *
+ * Return: If the thermal zone device has a slope attribute, return it, else
+ * return 1.
+ */
+int thermal_zone_get_slope(struct thermal_zone_device *tz)
+{
+       if (tz && tz->tzp)
+               return tz->tzp->slope;
+       return 1;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_get_slope);
+
+/**
+ * thermal_zone_get_offset - return the offset attribute of the thermal zone
+ * @tz: thermal zone device with the offset attribute
+ *
+ * Return: If the thermal zone device has a offset attribute, return it, else
+ * return 0.
+ */
+int thermal_zone_get_offset(struct thermal_zone_device *tz)
+{
+       if (tz && tz->tzp)
+               return tz->tzp->offset;
+       return 0;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_get_offset);
+
 #ifdef CONFIG_NET
 static const struct genl_multicast_group thermal_event_mcgrps[] = {
        { .name = THERMAL_GENL_MCAST_GROUP_NAME, },

diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index ee517bef0db04902412c17b7eceac24839a4564f..707d7353c28b79700b28320255cfeefb3c09db9e 100644 (file)
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -435,6 +435,8 @@ thermal_of_cooling_device_register(struct device_node *np, char *, void *,
 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
+int thermal_zone_get_slope(struct thermal_zone_device *tz);
+int thermal_zone_get_offset(struct thermal_zone_device *tz);
 
 int get_tz_trend(struct thermal_zone_device *, int);
 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
@@ -492,6 +494,12 @@ static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
 static inline int thermal_zone_get_temp(
                struct thermal_zone_device *tz, int *temp)
 { return -ENODEV; }
+static inline int thermal_zone_get_slope(
+               struct thermal_zone_device *tz)
+{ return -ENODEV; }
+static inline int thermal_zone_get_offset(
+               struct thermal_zone_device *tz)
+{ return -ENODEV; }
 static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
 { return -ENODEV; }
 static inline struct thermal_instance *