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-rw-r--r--src/libcamera/camera_sensor.cpp35
-rw-r--r--src/libcamera/include/camera_sensor.h2
-rw-r--r--src/libcamera/include/v4l2_device.h2
-rw-r--r--src/libcamera/v4l2_device.cpp60
4 files changed, 49 insertions, 50 deletions
diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
index 2219a430..7c1d9b9e 100644
--- a/src/libcamera/camera_sensor.cpp
+++ b/src/libcamera/camera_sensor.cpp
@@ -299,30 +299,24 @@ const ControlInfoMap &CameraSensor::controls() const
/**
* \brief Read controls from the sensor
- * \param[inout] ctrls The list of controls to read
+ * \param[in] ids The list of control to read, specified by their ID
*
- * This method reads the value of all controls contained in \a ctrls, and stores
- * their values in the corresponding \a ctrls entry.
+ * This method reads the value of all controls contained in \a ids, and returns
+ * their values as a ControlList.
*
- * If any control in \a ctrls is not supported by the device, is disabled (i.e.
- * has the V4L2_CTRL_FLAG_DISABLED flag set), is a compound control, or if any
- * other error occurs during validation of the requested controls, no control is
- * read and this method returns -EINVAL.
- *
- * If an error occurs while reading the controls, the index of the first control
- * that couldn't be read is returned. The value of all controls below that index
- * are updated in \a ctrls, while the value of all the other controls are not
- * changed.
+ * If any control in \a ids is not supported by the device, is disabled (i.e.
+ * has the V4L2_CTRL_FLAG_DISABLED flag set), or if any other error occurs
+ * during validation of the requested controls, no control is read and this
+ * method returns an empty control list.
*
* \sa V4L2Device::getControls()
*
- * \return 0 on success or an error code otherwise
- * \retval -EINVAL One of the control is not supported or not accessible
- * \retval i The index of the control that failed
+ * \return The control values in a ControlList on success, or an empty list on
+ * error
*/
-int CameraSensor::getControls(ControlList *ctrls)
+ControlList CameraSensor::getControls(const std::vector<uint32_t> &ids)
{
- return subdev_->getControls(ctrls);
+ return subdev_->getControls(ids);
}
/**
@@ -340,10 +334,9 @@ int CameraSensor::getControls(ControlList *ctrls)
* \a ctrls entry.
*
* If any control in \a ctrls is not supported by the device, is disabled (i.e.
- * has the V4L2_CTRL_FLAG_DISABLED flag set), is read-only, is a
- * compound control, or if any other error occurs during validation of
- * the requested controls, no control is written and this method returns
- * -EINVAL.
+ * has the V4L2_CTRL_FLAG_DISABLED flag set), is read-only, or if any other
+ * error occurs during validation of the requested controls, no control is
+ * written and this method returns -EINVAL.
*
* If an error occurs while writing the controls, the index of the first
* control that couldn't be written is returned. All controls below that index
diff --git a/src/libcamera/include/camera_sensor.h b/src/libcamera/include/camera_sensor.h
index 99cff981..5277f7f7 100644
--- a/src/libcamera/include/camera_sensor.h
+++ b/src/libcamera/include/camera_sensor.h
@@ -43,7 +43,7 @@ public:
int setFormat(V4L2SubdeviceFormat *format);
const ControlInfoMap &controls() const;
- int getControls(ControlList *ctrls);
+ ControlList getControls(const std::vector<uint32_t> &ids);
int setControls(ControlList *ctrls);
const ControlList &properties() const { return properties_; }
diff --git a/src/libcamera/include/v4l2_device.h b/src/libcamera/include/v4l2_device.h
index ce8edd98..e604a40d 100644
--- a/src/libcamera/include/v4l2_device.h
+++ b/src/libcamera/include/v4l2_device.h
@@ -26,7 +26,7 @@ public:
const ControlInfoMap &controls() const { return controls_; }
- int getControls(ControlList *ctrls);
+ ControlList getControls(const std::vector<uint32_t> &ids);
int setControls(ControlList *ctrls);
const std::string &deviceNode() const { return deviceNode_; }
diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp
index c134266e..d08ab531 100644
--- a/src/libcamera/v4l2_device.cpp
+++ b/src/libcamera/v4l2_device.cpp
@@ -147,46 +147,51 @@ void V4L2Device::close()
/**
* \brief Read controls from the device
- * \param[inout] ctrls The list of controls to read
+ * \param[in] ids The list of controls to read, specified by their ID
*
- * This method reads the value of all controls contained in \a ctrls, and stores
- * their values in the corresponding \a ctrls entry.
+ * This method reads the value of all controls contained in \a ids, and returns
+ * their values as a ControlList.
*
- * If any control in \a ctrls is not supported by the device, is disabled (i.e.
+ * If any control in \a ids is not supported by the device, is disabled (i.e.
* has the V4L2_CTRL_FLAG_DISABLED flag set), or if any other error occurs
* during validation of the requested controls, no control is read and this
- * method returns -EINVAL.
- *
- * If an error occurs while reading the controls, the index of the first control
- * that couldn't be read is returned. The value of all controls below that index
- * are updated in \a ctrls, while the value of all the other controls are not
- * changed.
+ * method returns an empty control list.
*
- * \return 0 on success or an error code otherwise
- * \retval -EINVAL One of the control is not supported or not accessible
- * \retval i The index of the control that failed
+ * \return The control values in a ControlList on success, or an empty list on
+ * error
*/
-int V4L2Device::getControls(ControlList *ctrls)
+ControlList V4L2Device::getControls(const std::vector<uint32_t> &ids)
{
- unsigned int count = ctrls->size();
+ unsigned int count = ids.size();
if (count == 0)
- return 0;
+ return {};
- struct v4l2_ext_control v4l2Ctrls[count];
- memset(v4l2Ctrls, 0, sizeof(v4l2Ctrls));
+ ControlList ctrls{ controls_ };
- unsigned int i = 0;
- for (auto &ctrl : *ctrls) {
- unsigned int id = ctrl.first;
+ /*
+ * Start by filling the ControlList. This can't be combined with filling
+ * v4l2Ctrls, as updateControls() relies on both containers having the
+ * same order, and the control list is based on a map, which is not
+ * sorted by insertion order.
+ */
+ for (uint32_t id : ids) {
const auto iter = controls_.find(id);
if (iter == controls_.end()) {
LOG(V4L2, Error)
<< "Control " << utils::hex(id) << " not found";
- return -EINVAL;
+ return {};
}
+ ctrls.set(id, {});
+ }
+
+ struct v4l2_ext_control v4l2Ctrls[count];
+ memset(v4l2Ctrls, 0, sizeof(v4l2Ctrls));
+
+ unsigned int i = 0;
+ for (auto &ctrl : ctrls) {
+ unsigned int id = ctrl.first;
const struct v4l2_query_ext_ctrl &info = controlInfo_[id];
- ControlValue &value = ctrl.second;
if (info.flags & V4L2_CTRL_FLAG_HAS_PAYLOAD) {
ControlType type;
@@ -200,9 +205,10 @@ int V4L2Device::getControls(ControlList *ctrls)
LOG(V4L2, Error)
<< "Unsupported payload control type "
<< info.type;
- return -EINVAL;
+ return {};
}
+ ControlValue &value = ctrl.second;
value.reserve(type, true, info.elems);
Span<uint8_t> data = value.data();
@@ -227,7 +233,7 @@ int V4L2Device::getControls(ControlList *ctrls)
if (errorIdx == 0 || errorIdx >= count) {
LOG(V4L2, Error) << "Unable to read controls: "
<< strerror(-ret);
- return -EINVAL;
+ return {};
}
/* A specific control failed. */
@@ -237,9 +243,9 @@ int V4L2Device::getControls(ControlList *ctrls)
ret = errorIdx;
}
- updateControls(ctrls, v4l2Ctrls, count);
+ updateControls(&ctrls, v4l2Ctrls, count);
- return ret;
+ return ctrls;
}
/**
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-19 08:33:49 +0000