3 files changed, 31 insertions, 0 deletions

diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index 7d44d7f1a71b..c1f6864a8c5d 100644
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -190,6 +190,8 @@ Thermal zone device sys I/F, created once it's registered:
     |---k_i:                    PID's integral term in the power allocator gov
     |---k_d:                    PID's derivative term in the power allocator
     |---integral_cutoff:        Offset above which errors are accumulated
+    |---slope:                  Slope constant applied as linear extrapolation
+    |---offset:                 Offset constant applied as linear extrapolation
 
 Thermal cooling device sys I/F, created once it's registered:
 /sys/class/thermal/cooling_device[0-*]:
@@ -359,6 +361,20 @@ integral_cutoff
         Documentation/thermal/power_allocator.txt
         RW, Optional
 
+slope
+        The slope constant used in a linear extrapolation model
+        to determine a hotspot temperature based off the sensor's
+        raw readings. It is up to the device driver to determine
+        the usage of these values.
+        RW, Optional
+
+offset
+        The offset constant used in a linear extrapolation model
+        to determine a hotspot temperature based off the sensor's
+        raw readings. It is up to the device driver to determine
+        the usage of these values.
+        RW, Optional
+
 *****************************
 * Cooling device attributes *
 *****************************
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 962de1847cc0..04659bfb888b 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -944,6 +944,8 @@ create_s32_tzp_attr(k_pu);
 create_s32_tzp_attr(k_i);
 create_s32_tzp_attr(k_d);
 create_s32_tzp_attr(integral_cutoff);
+create_s32_tzp_attr(slope);
+create_s32_tzp_attr(offset);
 #undef create_s32_tzp_attr
 
 static struct device_attribute *dev_tzp_attrs[] = {
@@ -953,6 +955,8 @@ static struct device_attribute *dev_tzp_attrs[] = {
         &dev_attr_k_i,
         &dev_attr_k_d,
         &dev_attr_integral_cutoff,
+        &dev_attr_slope,
+        &dev_attr_offset,
 };
 
 static int create_tzp_attrs(struct device *dev)
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 6bbe11c97cea..037e9df2f610 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -302,6 +302,17 @@ struct thermal_zone_params {
 
         /* threshold below which the error is no longer accumulated */
         s32 integral_cutoff;
+
+        /*
+         * @slope:      slope of a linear temperature adjustment curve.
+         *              Used by thermal zone drivers.
+         */
+        int slope;
+        /*
+         * @offset:     offset of a linear temperature adjustment curve.
+         *              Used by thermal zone drivers (default 0).
+         */
+        int offset;
 };
 
 struct thermal_genl_event {