To prepare for code refactoring, copy the V4L2 async notifier helper
code used by this driver verbatim from imx-media-dev-common.c. Rename
some functions to avoid name clashes. No functional change included.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/staging/media/imx/imx7-media-csi.c | 210 ++++++++++++++++++++-
1 file changed, 209 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/media/imx/imx7-media-csi.c b/drivers/staging/media/imx/imx7-media-csi.c
index d7c65b8bb3c9..708076b7045a 100644
--- a/drivers/staging/media/imx/imx7-media-csi.c
+++ b/drivers/staging/media/imx/imx7-media-csi.c
@@ -717,6 +717,214 @@ static irqreturn_t imx7_csi_irq_handler(int irq, void *data)
return IRQ_HANDLED;
}
+/* -----------------------------------------------------------------------------
+ * Temporary copy of imx_media_dev helpers
+ */
+
+static inline struct imx_media_dev *notifier2dev(struct v4l2_async_notifier *n)
+{
+ return container_of(n, struct imx_media_dev, notifier);
+}
+
+/*
+ * Create the missing media links from the CSI-2 receiver.
+ * Called after all async subdevs have bound.
+ */
+static void imx_media_create_csi2_links(struct imx_media_dev *imxmd)
+{
+ struct v4l2_subdev *sd, *csi2 = NULL;
+
+ list_for_each_entry(sd, &imxmd->v4l2_dev.subdevs, list) {
+ if (sd->grp_id == IMX_MEDIA_GRP_ID_CSI2) {
+ csi2 = sd;
+ break;
+ }
+ }
+ if (!csi2)
+ return;
+
+ list_for_each_entry(sd, &imxmd->v4l2_dev.subdevs, list) {
+ /* skip if not a CSI or a CSI mux */
+ if (!(sd->grp_id & IMX_MEDIA_GRP_ID_IPU_CSI) &&
+ !(sd->grp_id & IMX_MEDIA_GRP_ID_CSI) &&
+ !(sd->grp_id & IMX_MEDIA_GRP_ID_CSI_MUX))
+ continue;
+
+ v4l2_create_fwnode_links(csi2, sd);
+ }
+}
+
+/*
+ * adds given video device to given imx-media source pad vdev list.
+ * Continues upstream from the pad entity's sink pads.
+ */
+static int imx_media_add_vdev_to_pad(struct imx_media_dev *imxmd,
+ struct imx_media_video_dev *vdev,
+ struct media_pad *srcpad)
+{
+ struct media_entity *entity = srcpad->entity;
+ struct imx_media_pad_vdev *pad_vdev;
+ struct list_head *pad_vdev_list;
+ struct media_link *link;
+ struct v4l2_subdev *sd;
+ int i, ret;
+
+ /* skip this entity if not a v4l2_subdev */
+ if (!is_media_entity_v4l2_subdev(entity))
+ return 0;
+
+ sd = media_entity_to_v4l2_subdev(entity);
+
+ pad_vdev_list = to_pad_vdev_list(sd, srcpad->index);
+ if (!pad_vdev_list) {
+ v4l2_warn(&imxmd->v4l2_dev, "%s:%u has no vdev list!\n",
+ entity->name, srcpad->index);
+ /*
+ * shouldn't happen, but no reason to fail driver load,
+ * just skip this entity.
+ */
+ return 0;
+ }
+
+ /* just return if we've been here before */
+ list_for_each_entry(pad_vdev, pad_vdev_list, list) {
+ if (pad_vdev->vdev == vdev)
+ return 0;
+ }
+
+ dev_dbg(imxmd->md.dev, "adding %s to pad %s:%u\n",
+ vdev->vfd->entity.name, entity->name, srcpad->index);
+
+ pad_vdev = devm_kzalloc(imxmd->md.dev, sizeof(*pad_vdev), GFP_KERNEL);
+ if (!pad_vdev)
+ return -ENOMEM;
+
+ /* attach this vdev to this pad */
+ pad_vdev->vdev = vdev;
+ list_add_tail(&pad_vdev->list, pad_vdev_list);
+
+ /* move upstream from this entity's sink pads */
+ for (i = 0; i < entity->num_pads; i++) {
+ struct media_pad *pad = &entity->pads[i];
+
+ if (!(pad->flags & MEDIA_PAD_FL_SINK))
+ continue;
+
+ list_for_each_entry(link, &entity->links, list) {
+ if (link->sink != pad)
+ continue;
+ ret = imx_media_add_vdev_to_pad(imxmd, vdev,
+ link->source);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * For every subdevice, allocate an array of list_head's, one list_head
+ * for each pad, to hold the list of video devices reachable from that
+ * pad.
+ */
+static int imx_media_alloc_pad_vdev_lists(struct imx_media_dev *imxmd)
+{
+ struct list_head *vdev_lists;
+ struct media_entity *entity;
+ struct v4l2_subdev *sd;
+ int i;
+
+ list_for_each_entry(sd, &imxmd->v4l2_dev.subdevs, list) {
+ entity = &sd->entity;
+ vdev_lists = devm_kcalloc(imxmd->md.dev,
+ entity->num_pads, sizeof(*vdev_lists),
+ GFP_KERNEL);
+ if (!vdev_lists)
+ return -ENOMEM;
+
+ /* attach to the subdev's host private pointer */
+ sd->host_priv = vdev_lists;
+
+ for (i = 0; i < entity->num_pads; i++)
+ INIT_LIST_HEAD(to_pad_vdev_list(sd, i));
+ }
+
+ return 0;
+}
+
+/* form the vdev lists in all imx-media source pads */
+static int imx_media_create_pad_vdev_lists(struct imx_media_dev *imxmd)
+{
+ struct imx_media_video_dev *vdev;
+ struct media_link *link;
+ int ret;
+
+ ret = imx_media_alloc_pad_vdev_lists(imxmd);
+ if (ret)
+ return ret;
+
+ list_for_each_entry(vdev, &imxmd->vdev_list, list) {
+ link = list_first_entry(&vdev->vfd->entity.links,
+ struct media_link, list);
+ ret = imx_media_add_vdev_to_pad(imxmd, vdev, link->source);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/* async subdev complete notifier */
+static int __imx_media_probe_complete(struct v4l2_async_notifier *notifier)
+{
+ struct imx_media_dev *imxmd = notifier2dev(notifier);
+ int ret;
+
+ mutex_lock(&imxmd->mutex);
+
+ imx_media_create_csi2_links(imxmd);
+
+ ret = imx_media_create_pad_vdev_lists(imxmd);
+ if (ret)
+ goto unlock;
+
+ ret = v4l2_device_register_subdev_nodes(&imxmd->v4l2_dev);
+unlock:
+ mutex_unlock(&imxmd->mutex);
+ if (ret)
+ return ret;
+
+ return media_device_register(&imxmd->md);
+}
+
+static const struct v4l2_async_notifier_operations imx_media_notifier_ops = {
+ .complete = __imx_media_probe_complete,
+};
+
+static int __imx_media_dev_notifier_register(struct imx_media_dev *imxmd,
+ const struct v4l2_async_notifier_operations *ops)
+{
+ int ret;
+
+ /* no subdevs? just bail */
+ if (list_empty(&imxmd->notifier.asd_list)) {
+ v4l2_err(&imxmd->v4l2_dev, "no subdevs\n");
+ return -ENODEV;
+ }
+
+ /* prepare the async subdev notifier and register it */
+ imxmd->notifier.ops = ops ? ops : &imx_media_notifier_ops;
+ ret = v4l2_async_nf_register(&imxmd->v4l2_dev, &imxmd->notifier);
+ if (ret) {
+ v4l2_err(&imxmd->v4l2_dev,
+ "v4l2_async_nf_register failed with %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
/* -----------------------------------------------------------------------------
* V4L2 Subdev Operations
*/
@@ -1200,7 +1408,7 @@ static int imx7_csi_media_init(struct imx7_csi *csi)
return ret;
}
- ret = imx_media_dev_notifier_register(imxmd, NULL);
+ ret = __imx_media_dev_notifier_register(imxmd, NULL);
if (ret < 0) {
imx7_csi_media_cleanup(csi);
return ret;
--
Regards,
Laurent Pinchart
