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-rw-r--r--src/libcamera/camera_sensor.cpp84
1 files changed, 84 insertions, 0 deletions
diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
index e786821d..048fcd6a 100644
--- a/src/libcamera/camera_sensor.cpp
+++ b/src/libcamera/camera_sensor.cpp
@@ -207,6 +207,10 @@ int CameraSensor::init()
*/
resolution_ = sizes_.back();
+ ret = validateSensorDriver();
+ if (ret)
+ return ret;
+
ret = initProperties();
if (ret)
return ret;
@@ -214,6 +218,86 @@ int CameraSensor::init()
return 0;
}
+int CameraSensor::validateSensorDriver()
+{
+ /*
+ * Make sure the sensor driver supports the mandatory controls
+ * required by the CameraSensor class.
+ * - V4L2_CID_PIXEL_RATE is used to calculate the sensor timings
+ * - V4L2_CID_HBLANK is used to calculate the line length
+ */
+ const std::vector<uint32_t> mandatoryControls{
+ V4L2_CID_PIXEL_RATE,
+ V4L2_CID_HBLANK,
+ };
+
+ ControlList ctrls = subdev_->getControls(mandatoryControls);
+ if (ctrls.empty()) {
+ LOG(CameraSensor, Error)
+ << "Mandatory V4L2 controls not available";
+ LOG(CameraSensor, Error)
+ << "The sensor kernel driver needs to be fixed";
+ LOG(CameraSensor, Error)
+ << "See Documentation/sensor_driver_requirements.rst in the libcamera sources for more information";
+ return -EINVAL;
+ }
+
+ /*
+ * Optional controls are used to register optional sensor properties. If
+ * not present, some values will be defaulted.
+ */
+ const std::vector<uint32_t> optionalControls{
+ V4L2_CID_CAMERA_ORIENTATION,
+ V4L2_CID_CAMERA_SENSOR_ROTATION,
+ };
+
+ ctrls = subdev_->getControls(optionalControls);
+ if (ctrls.empty())
+ LOG(CameraSensor, Debug) << "Optional V4L2 controls not supported";
+
+ /*
+ * Make sure the required selection targets are supported.
+ *
+ * Failures in reading any of the targets are not deemed to be fatal,
+ * but some properties and features, like constructing a
+ * CameraSensorInfo for the IPA module, won't be supported.
+ *
+ * \todo Make support for selection targets mandatory as soon as all
+ * test platforms have been updated.
+ */
+ int err = 0;
+ Rectangle rect;
+ int ret = subdev_->getSelection(pad_, V4L2_SEL_TGT_CROP_BOUNDS, &rect);
+ if (ret) {
+ LOG(CameraSensor, Warning)
+ << "Failed to retrieve the readable pixel array size";
+ err = -EINVAL;
+ }
+
+ ret = subdev_->getSelection(pad_, V4L2_SEL_TGT_CROP_DEFAULT, &rect);
+ if (ret) {
+ LOG(CameraSensor, Warning)
+ << "Failed to retrieve the active pixel array size";
+ err = -EINVAL;
+ }
+
+ ret = subdev_->getSelection(pad_, V4L2_SEL_TGT_CROP, &rect);
+ if (ret) {
+ LOG(CameraSensor, Warning)
+ << "Failed to retrieve the sensor crop rectangle";
+ err = -EINVAL;
+ }
+
+ if (err) {
+ LOG(CameraSensor, Warning)
+ << "The sensor kernel driver needs to be fixed";
+ LOG(CameraSensor, Warning)
+ << "See Documentation/sensor_driver_requirements.rst in the libcamera sources for more information";
+ }
+
+ return 0;
+}
+
int CameraSensor::initProperties()
{
/*