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libcamera: camera_sensor: Add V4L2 control operations
Add operations to get and set control and to retrieve the informations on a V4L2 control. For simple camera sensors, the operations are directly called on the underlying V4L2 subdevice. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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2 changed files with 75 additions and 0 deletions
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@ -247,6 +247,75 @@ int CameraSensor::setFormat(V4L2SubdeviceFormat *format)
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return subdev_->setFormat(0, format);
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}
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/**
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* \brief Retrieve information about a control
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* \param[in] id The control ID
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* \return A pointer to the V4L2ControlInfo for control \a id, or nullptr
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* if the sensor doesn't have such a control
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*/
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const V4L2ControlInfo *CameraSensor::getControlInfo(unsigned int id) const
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{
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return subdev_->getControlInfo(id);
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}
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/**
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* \brief Read controls from the sensor
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* \param[inout] ctrls The list of controls to read
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*
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* This method reads the value of all controls contained in \a ctrls, and stores
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* their values in the corresponding \a ctrls entry.
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*
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* If any control in \a ctrls is not supported by the device, is disabled (i.e.
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* has the V4L2_CTRL_FLAG_DISABLED flag set), is a compound control, or if any
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* other error occurs during validation of the requested controls, no control is
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* read and this method returns -EINVAL.
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*
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* If an error occurs while reading the controls, the index of the first control
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* that couldn't be read is returned. The value of all controls below that index
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* are updated in \a ctrls, while the value of all the other controls are not
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* changed.
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*
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* \sa V4L2Device::getControls()
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*
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* \return 0 on success or an error code otherwise
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* \retval -EINVAL One of the control is not supported or not accessible
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* \retval i The index of the control that failed
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*/
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int CameraSensor::getControls(V4L2ControlList *ctrls)
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{
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return subdev_->getControls(ctrls);
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}
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/**
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* \brief Write controls to the sensor
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* \param[in] ctrls The list of controls to write
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*
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* This method writes the value of all controls contained in \a ctrls, and
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* stores the values actually applied to the device in the corresponding
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* \a ctrls entry.
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*
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* If any control in \a ctrls is not supported by the device, is disabled (i.e.
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* has the V4L2_CTRL_FLAG_DISABLED flag set), is read-only, is a
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* compound control, or if any other error occurs during validation of
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* the requested controls, no control is written and this method returns
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* -EINVAL.
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*
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* If an error occurs while writing the controls, the index of the first
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* control that couldn't be written is returned. All controls below that index
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* are written and their values are updated in \a ctrls, while all other
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* controls are not written and their values are not changed.
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*
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* \sa V4L2Device::setControls()
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*
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* \return 0 on success or an error code otherwise
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* \retval -EINVAL One of the control is not supported or not accessible
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* \retval i The index of the control that failed
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*/
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int CameraSensor::setControls(V4L2ControlList *ctrls)
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{
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return subdev_->setControls(ctrls);
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}
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std::string CameraSensor::logPrefix() const
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{
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return "'" + subdev_->entity()->name() + "'";
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@ -17,6 +17,8 @@
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namespace libcamera {
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class MediaEntity;
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class V4L2ControlInfo;
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class V4L2ControlList;
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class V4L2Subdevice;
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struct V4L2SubdeviceFormat;
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@ -41,6 +43,10 @@ public:
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const Size &size) const;
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int setFormat(V4L2SubdeviceFormat *format);
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const V4L2ControlInfo *getControlInfo(unsigned int id) const;
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int getControls(V4L2ControlList *ctrls);
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int setControls(V4L2ControlList *ctrls);
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protected:
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std::string logPrefix() const;
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