Add V4L2_CID_TEMPERATURE control to get temperature from sensor in
celsius as a volatile and read-only control, and its documentation.
Useful to monitor thermals from v4l controls for sensors that support
this.
Signed-off-by: Benjamin Mugnier <benjamin.mugnier@xxxxxxxxxxx>
---
Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst | 3 +++
drivers/media/v4l2-core/v4l2-ctrls-defs.c | 4 ++++
include/uapi/linux/v4l2-controls.h | 2 ++
3 files changed, 9 insertions(+)
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst
index 4c5061aa9cd4..26fa21f5c45a 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst
@@ -661,3 +661,6 @@ enum v4l2_scene_mode -
.. [#f1]
This control may be changed to a menu control in the future, if more
options are required.
+
+``V4L2_CID_TEMPERATURE (integer)``
+ The temperature of the sensor in celsius. This is a read-only control.
diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
index 54ca4e6b820b..45ad3edd59e0 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
@@ -1042,6 +1042,7 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_UNIT_CELL_SIZE: return "Unit Cell Size";
case V4L2_CID_CAMERA_ORIENTATION: return "Camera Orientation";
case V4L2_CID_CAMERA_SENSOR_ROTATION: return "Camera Sensor Rotation";
+ case V4L2_CID_TEMPERATURE: return "Temperature in °C";
/* FM Radio Modulator controls */
/* Keep the order of the 'case's the same as in v4l2-controls.h! */
@@ -1597,6 +1598,9 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
case V4L2_CID_RF_TUNER_PLL_LOCK:
*flags |= V4L2_CTRL_FLAG_VOLATILE;
break;
+ case V4L2_CID_TEMPERATURE:
+ *flags |= V4L2_CTRL_FLAG_READ_ONLY |
+ V4L2_CTRL_FLAG_VOLATILE;
}
}
EXPORT_SYMBOL(v4l2_ctrl_fill);
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index bb40129446d4..705b4043c2de 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -1008,6 +1008,8 @@ enum v4l2_auto_focus_range {
#define V4L2_CID_CAMERA_SENSOR_ROTATION (V4L2_CID_CAMERA_CLASS_BASE+35)
+#define V4L2_CID_TEMPERATURE (V4L2_CID_CAMERA_CLASS_BASE+36)
+
/* FM Modulator class control IDs */
#define V4L2_CID_FM_TX_CLASS_BASE (V4L2_CTRL_CLASS_FM_TX | 0x900)
--
2.25.1
