diff options
| author | Eduardo Valentin <edubezval@gmail.com> | 2015-05-11 19:34:23 -0700 |
|---|---|---|
| committer | Kevin Hilman <khilman@linaro.org> | 2015-07-07 09:20:24 -0700 |
| commit | 5b943ea4df2d865a0dd3d2ba9c03f68c436d87c6 (patch) | |
| tree | 379aa3d0aff4bebd84988c633d84ac08b458e296 /Documentation | |
| parent | 9865d3221d3d9630116c4c9b30cf3276b2655109 (diff) | |
thermal: support slope and offset coefficients
It is common to have a linear extrapolation from
the current sensor readings and the actual temperature
value. This is specially the case when the sensor
is in use to extrapolate hotspots.
This patch adds slope and offset constants for
single sensor linear extrapolation equation. Because
the same sensor can be use in different locations,
from board to board, these constants are added
as part of thermal_zone_params.
The constants are available through sysfs.
It is up to the device driver to determine
the usage of these values.
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
(cherry picked from commit 9d0be7f4810257a9b0fc78fff641f14409f14ab3)
Signed-off-by: Kevin Hilman <khilman@linaro.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/thermal/sysfs-api.txt | 16 |
1 files changed, 16 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 * ***************************** |