// SPDX-License-Identifier: GPL-2.0
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/*
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* V4L2 Media Controller Driver for Freescale common i.MX5/6/7 SOC
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*
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* Copyright (c) 2019 Linaro Ltd
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* Copyright (c) 2016 Mentor Graphics Inc.
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*/
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#include <linux/of_graph.h>
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#include <linux/of_platform.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-event.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-mc.h>
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#include "imx-media.h"
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static inline struct imx_media_dev *notifier2dev(struct v4l2_async_notifier *n)
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{
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return container_of(n, struct imx_media_dev, notifier);
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}
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/* async subdev bound notifier */
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static int imx_media_subdev_bound(struct v4l2_async_notifier *notifier,
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struct v4l2_subdev *sd,
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struct v4l2_async_subdev *asd)
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{
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struct imx_media_dev *imxmd = notifier2dev(notifier);
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dev_dbg(imxmd->md.dev, "subdev %s bound\n", sd->name);
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return 0;
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}
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/*
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* Create the missing media links from the CSI-2 receiver.
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* Called after all async subdevs have bound.
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*/
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static void imx_media_create_csi2_links(struct imx_media_dev *imxmd)
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{
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struct v4l2_subdev *sd, *csi2 = NULL;
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list_for_each_entry(sd, &imxmd->v4l2_dev.subdevs, list) {
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if (sd->grp_id == IMX_MEDIA_GRP_ID_CSI2) {
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csi2 = sd;
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break;
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}
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}
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if (!csi2)
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return;
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list_for_each_entry(sd, &imxmd->v4l2_dev.subdevs, list) {
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/* skip if not a CSI or a CSI mux */
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if (!(sd->grp_id & IMX_MEDIA_GRP_ID_IPU_CSI) &&
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!(sd->grp_id & IMX_MEDIA_GRP_ID_CSI) &&
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!(sd->grp_id & IMX_MEDIA_GRP_ID_CSI_MUX))
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continue;
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v4l2_create_fwnode_links(csi2, sd);
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}
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}
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/*
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* adds given video device to given imx-media source pad vdev list.
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* Continues upstream from the pad entity's sink pads.
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*/
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static int imx_media_add_vdev_to_pad(struct imx_media_dev *imxmd,
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struct imx_media_video_dev *vdev,
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struct media_pad *srcpad)
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{
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struct media_entity *entity = srcpad->entity;
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struct imx_media_pad_vdev *pad_vdev;
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struct list_head *pad_vdev_list;
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struct media_link *link;
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struct v4l2_subdev *sd;
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int i, ret;
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/* skip this entity if not a v4l2_subdev */
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if (!is_media_entity_v4l2_subdev(entity))
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return 0;
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sd = media_entity_to_v4l2_subdev(entity);
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pad_vdev_list = to_pad_vdev_list(sd, srcpad->index);
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if (!pad_vdev_list) {
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v4l2_warn(&imxmd->v4l2_dev, "%s:%u has no vdev list!\n",
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entity->name, srcpad->index);
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/*
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* shouldn't happen, but no reason to fail driver load,
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* just skip this entity.
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*/
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return 0;
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}
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/* just return if we've been here before */
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list_for_each_entry(pad_vdev, pad_vdev_list, list) {
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if (pad_vdev->vdev == vdev)
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return 0;
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}
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dev_dbg(imxmd->md.dev, "adding %s to pad %s:%u\n",
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vdev->vfd->entity.name, entity->name, srcpad->index);
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pad_vdev = devm_kzalloc(imxmd->md.dev, sizeof(*pad_vdev), GFP_KERNEL);
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if (!pad_vdev)
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return -ENOMEM;
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/* attach this vdev to this pad */
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pad_vdev->vdev = vdev;
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list_add_tail(&pad_vdev->list, pad_vdev_list);
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/* move upstream from this entity's sink pads */
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for (i = 0; i < entity->num_pads; i++) {
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struct media_pad *pad = &entity->pads[i];
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if (!(pad->flags & MEDIA_PAD_FL_SINK))
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continue;
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list_for_each_entry(link, &entity->links, list) {
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if (link->sink != pad)
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continue;
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ret = imx_media_add_vdev_to_pad(imxmd, vdev,
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link->source);
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if (ret)
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return ret;
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}
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}
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return 0;
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}
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/*
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* For every subdevice, allocate an array of list_head's, one list_head
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* for each pad, to hold the list of video devices reachable from that
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* pad.
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*/
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static int imx_media_alloc_pad_vdev_lists(struct imx_media_dev *imxmd)
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{
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struct list_head *vdev_lists;
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struct media_entity *entity;
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struct v4l2_subdev *sd;
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int i;
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list_for_each_entry(sd, &imxmd->v4l2_dev.subdevs, list) {
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entity = &sd->entity;
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vdev_lists = devm_kcalloc(imxmd->md.dev,
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entity->num_pads, sizeof(*vdev_lists),
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GFP_KERNEL);
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if (!vdev_lists)
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return -ENOMEM;
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/* attach to the subdev's host private pointer */
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sd->host_priv = vdev_lists;
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for (i = 0; i < entity->num_pads; i++)
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INIT_LIST_HEAD(to_pad_vdev_list(sd, i));
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}
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return 0;
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}
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/* form the vdev lists in all imx-media source pads */
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static int imx_media_create_pad_vdev_lists(struct imx_media_dev *imxmd)
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{
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struct imx_media_video_dev *vdev;
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struct media_link *link;
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int ret;
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ret = imx_media_alloc_pad_vdev_lists(imxmd);
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if (ret)
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return ret;
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list_for_each_entry(vdev, &imxmd->vdev_list, list) {
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link = list_first_entry(&vdev->vfd->entity.links,
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struct media_link, list);
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ret = imx_media_add_vdev_to_pad(imxmd, vdev, link->source);
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if (ret)
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return ret;
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}
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return 0;
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}
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/* async subdev complete notifier */
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int imx_media_probe_complete(struct v4l2_async_notifier *notifier)
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{
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struct imx_media_dev *imxmd = notifier2dev(notifier);
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int ret;
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mutex_lock(&imxmd->mutex);
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imx_media_create_csi2_links(imxmd);
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ret = imx_media_create_pad_vdev_lists(imxmd);
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if (ret)
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goto unlock;
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ret = v4l2_device_register_subdev_nodes(&imxmd->v4l2_dev);
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unlock:
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mutex_unlock(&imxmd->mutex);
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if (ret)
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return ret;
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return media_device_register(&imxmd->md);
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}
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EXPORT_SYMBOL_GPL(imx_media_probe_complete);
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/*
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* adds controls to a video device from an entity subdevice.
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* Continues upstream from the entity's sink pads.
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*/
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static int imx_media_inherit_controls(struct imx_media_dev *imxmd,
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struct video_device *vfd,
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struct media_entity *entity)
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{
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int i, ret = 0;
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if (is_media_entity_v4l2_subdev(entity)) {
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struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
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dev_dbg(imxmd->md.dev,
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"adding controls to %s from %s\n",
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vfd->entity.name, sd->entity.name);
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ret = v4l2_ctrl_add_handler(vfd->ctrl_handler,
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sd->ctrl_handler,
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NULL, true);
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if (ret)
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return ret;
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}
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/* move upstream */
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for (i = 0; i < entity->num_pads; i++) {
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struct media_pad *pad, *spad = &entity->pads[i];
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if (!(spad->flags & MEDIA_PAD_FL_SINK))
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continue;
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pad = media_entity_remote_pad(spad);
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if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
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continue;
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ret = imx_media_inherit_controls(imxmd, vfd, pad->entity);
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if (ret)
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break;
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}
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return ret;
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}
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static int imx_media_link_notify(struct media_link *link, u32 flags,
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unsigned int notification)
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{
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struct imx_media_dev *imxmd = container_of(link->graph_obj.mdev,
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struct imx_media_dev, md);
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struct media_entity *source = link->source->entity;
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struct imx_media_pad_vdev *pad_vdev;
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struct list_head *pad_vdev_list;
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struct video_device *vfd;
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struct v4l2_subdev *sd;
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int pad_idx, ret;
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ret = v4l2_pipeline_link_notify(link, flags, notification);
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if (ret)
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return ret;
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/* don't bother if source is not a subdev */
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if (!is_media_entity_v4l2_subdev(source))
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return 0;
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sd = media_entity_to_v4l2_subdev(source);
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pad_idx = link->source->index;
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pad_vdev_list = to_pad_vdev_list(sd, pad_idx);
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if (!pad_vdev_list) {
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/* nothing to do if source sd has no pad vdev list */
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return 0;
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}
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/*
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* Before disabling a link, reset controls for all video
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* devices reachable from this link.
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*
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* After enabling a link, refresh controls for all video
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* devices reachable from this link.
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*/
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if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH &&
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!(flags & MEDIA_LNK_FL_ENABLED)) {
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list_for_each_entry(pad_vdev, pad_vdev_list, list) {
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vfd = pad_vdev->vdev->vfd;
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dev_dbg(imxmd->md.dev,
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"reset controls for %s\n",
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vfd->entity.name);
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v4l2_ctrl_handler_free(vfd->ctrl_handler);
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v4l2_ctrl_handler_init(vfd->ctrl_handler, 0);
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}
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} else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
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(link->flags & MEDIA_LNK_FL_ENABLED)) {
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list_for_each_entry(pad_vdev, pad_vdev_list, list) {
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vfd = pad_vdev->vdev->vfd;
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dev_dbg(imxmd->md.dev,
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"refresh controls for %s\n",
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vfd->entity.name);
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ret = imx_media_inherit_controls(imxmd, vfd,
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&vfd->entity);
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if (ret)
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break;
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}
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}
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return ret;
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}
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static void imx_media_notify(struct v4l2_subdev *sd, unsigned int notification,
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void *arg)
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{
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struct media_entity *entity = &sd->entity;
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int i;
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if (notification != V4L2_DEVICE_NOTIFY_EVENT)
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return;
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for (i = 0; i < entity->num_pads; i++) {
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struct media_pad *pad = &entity->pads[i];
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struct imx_media_pad_vdev *pad_vdev;
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struct list_head *pad_vdev_list;
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pad_vdev_list = to_pad_vdev_list(sd, pad->index);
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if (!pad_vdev_list)
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continue;
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list_for_each_entry(pad_vdev, pad_vdev_list, list)
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v4l2_event_queue(pad_vdev->vdev->vfd, arg);
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}
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}
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static const struct v4l2_async_notifier_operations imx_media_notifier_ops = {
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.bound = imx_media_subdev_bound,
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.complete = imx_media_probe_complete,
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};
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static const struct media_device_ops imx_media_md_ops = {
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.link_notify = imx_media_link_notify,
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};
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struct imx_media_dev *imx_media_dev_init(struct device *dev,
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const struct media_device_ops *ops)
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{
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struct imx_media_dev *imxmd;
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int ret;
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imxmd = devm_kzalloc(dev, sizeof(*imxmd), GFP_KERNEL);
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if (!imxmd)
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return ERR_PTR(-ENOMEM);
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dev_set_drvdata(dev, imxmd);
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strscpy(imxmd->md.model, "imx-media", sizeof(imxmd->md.model));
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imxmd->md.ops = ops ? ops : &imx_media_md_ops;
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imxmd->md.dev = dev;
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mutex_init(&imxmd->mutex);
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imxmd->v4l2_dev.mdev = &imxmd->md;
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imxmd->v4l2_dev.notify = imx_media_notify;
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strscpy(imxmd->v4l2_dev.name, "imx-media",
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sizeof(imxmd->v4l2_dev.name));
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snprintf(imxmd->md.bus_info, sizeof(imxmd->md.bus_info),
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"platform:%s", dev_name(imxmd->md.dev));
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media_device_init(&imxmd->md);
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ret = v4l2_device_register(dev, &imxmd->v4l2_dev);
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if (ret < 0) {
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v4l2_err(&imxmd->v4l2_dev,
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"Failed to register v4l2_device: %d\n", ret);
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goto cleanup;
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}
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INIT_LIST_HEAD(&imxmd->vdev_list);
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v4l2_async_notifier_init(&imxmd->notifier);
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return imxmd;
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cleanup:
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media_device_cleanup(&imxmd->md);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(imx_media_dev_init);
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int imx_media_dev_notifier_register(struct imx_media_dev *imxmd,
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const struct v4l2_async_notifier_operations *ops)
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{
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int ret;
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/* no subdevs? just bail */
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if (list_empty(&imxmd->notifier.asd_list)) {
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v4l2_err(&imxmd->v4l2_dev, "no subdevs\n");
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return -ENODEV;
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}
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/* prepare the async subdev notifier and register it */
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imxmd->notifier.ops = ops ? ops : &imx_media_notifier_ops;
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ret = v4l2_async_notifier_register(&imxmd->v4l2_dev,
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&imxmd->notifier);
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if (ret) {
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v4l2_err(&imxmd->v4l2_dev,
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"v4l2_async_notifier_register failed with %d\n", ret);
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(imx_media_dev_notifier_register);
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