Add a new 'active_state' field to struct v4l2_subdev to which we can
store the active state of a subdev. This will place the subdev
configuration into a known place, allowing us to use the state directly
from the v4l2 framework, thus simplifying the drivers.
Also add functions v4l2_subdev_init_finalize() and
v4l2_subdev_cleanup(), which will allocate and free the active state.
The functions are named in a generic way so that they can be also used
for other subdev initialization work.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Reviewed-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-subdev.c | 21 ++++++++++
include/media/v4l2-subdev.h | 58 +++++++++++++++++++++++++++
2 files changed, 79 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index a1494999352b..5ac447b3038c 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -906,6 +906,27 @@ void __v4l2_subdev_state_free(struct v4l2_subdev_state *state)
}
EXPORT_SYMBOL_GPL(__v4l2_subdev_state_free);
+int v4l2_subdev_init_finalize(struct v4l2_subdev *sd)
+{
+ struct v4l2_subdev_state *state;
+
+ state = __v4l2_subdev_state_alloc(sd);
+ if (IS_ERR(state))
+ return PTR_ERR(state);
+
+ sd->active_state = state;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_init_finalize);
+
+void v4l2_subdev_cleanup(struct v4l2_subdev *sd)
+{
+ __v4l2_subdev_state_free(sd->active_state);
+ sd->active_state = NULL;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_cleanup);
+
#endif /* CONFIG_MEDIA_CONTROLLER */
void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index ac3bcc54ea07..d0d0e4caf893 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -645,6 +645,9 @@ struct v4l2_subdev_ir_ops {
* This structure only needs to be passed to the pad op if the 'which' field
* of the main argument is set to %V4L2_SUBDEV_FORMAT_TRY. For
* %V4L2_SUBDEV_FORMAT_ACTIVE it is safe to pass %NULL.
+ *
+ * Note: This struct is also used in active state, and the 'try' prefix is
+ * historical and to be removed.
*/
struct v4l2_subdev_pad_config {
struct v4l2_mbus_framefmt try_fmt;
@@ -885,6 +888,9 @@ struct v4l2_subdev_platform_data {
* @subdev_notifier: A sub-device notifier implicitly registered for the sub-
* device using v4l2_async_register_subdev_sensor().
* @pdata: common part of subdevice platform data
+ * @active_state: Active state for the subdev (NULL for subdevs tracking the
+ * state internally). Initialized by calling
+ * v4l2_subdev_init_finalize().
*
* Each instance of a subdev driver should create this struct, either
* stand-alone or embedded in a larger struct.
@@ -916,6 +922,19 @@ struct v4l2_subdev {
struct v4l2_async_notifier *notifier;
struct v4l2_async_notifier *subdev_notifier;
struct v4l2_subdev_platform_data *pdata;
+
+ /*
+ * The fields below are private, and should only be accessed via
+ * appropriate functions.
+ */
+
+ /*
+ * TODO: active_state should most likely be changed from a pointer to an
+ * embedded field. For the time being it's kept as a pointer to more
+ * easily catch uses of active_state in the cases where the driver
+ * doesn't support it.
+ */
+ struct v4l2_subdev_state *active_state;
};
@@ -1141,6 +1160,45 @@ struct v4l2_subdev_state *__v4l2_subdev_state_alloc(struct v4l2_subdev *sd);
*/
void __v4l2_subdev_state_free(struct v4l2_subdev_state *state);
+/**
+ * v4l2_subdev_init_finalize() - Finalizes the initialization of the subdevice
+ * @sd: The subdev
+ *
+ * This function finalizes the initialization of the subdev, including
+ * allocation of the active state for the subdev.
+ *
+ * This function must be called by the subdev drivers that use the centralized
+ * active state, after the subdev struct has been initialized and
+ * media_entity_pads_init() has been called, but before registering the
+ * subdev.
+ *
+ * The user must call v4l2_subdev_cleanup() when the subdev is being removed.
+ */
+int v4l2_subdev_init_finalize(struct v4l2_subdev *sd);
+
+/**
+ * v4l2_subdev_cleanup() - Releases the resources allocated by the subdevice
+ * @sd: The subdevice
+ *
+ * This function will release the resources allocated in
+ * v4l2_subdev_init_finalize.
+ */
+void v4l2_subdev_cleanup(struct v4l2_subdev *sd);
+
+/**
+ * v4l2_subdev_get_active_state() - Returns the active subdev state for
+ * subdevice
+ * @sd: The subdevice
+ *
+ * Returns the active state for the subdevice, or NULL if the subdev does not
+ * support active state.
+ */
+static inline struct v4l2_subdev_state *
+v4l2_subdev_get_active_state(struct v4l2_subdev *sd)
+{
+ return sd->active_state;
+}
+
#endif /* CONFIG_MEDIA_CONTROLLER */
/**
--
2.25.1
