| /* |
| * V4L2 Media Controller Driver for Freescale i.MX5/6 SOC |
| * |
| * Copyright (c) 2016 Mentor Graphics Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| */ |
| #include <linux/delay.h> |
| #include <linux/fs.h> |
| #include <linux/module.h> |
| #include <linux/of_graph.h> |
| #include <linux/of_platform.h> |
| #include <linux/pinctrl/consumer.h> |
| #include <linux/platform_device.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/timer.h> |
| #include <media/v4l2-ctrls.h> |
| #include <media/v4l2-event.h> |
| #include <media/v4l2-ioctl.h> |
| #include <media/v4l2-mc.h> |
| #include <video/imx-ipu-v3.h> |
| #include <media/imx.h> |
| #include "imx-media.h" |
| |
| static inline struct imx_media_dev *notifier2dev(struct v4l2_async_notifier *n) |
| { |
| return container_of(n, struct imx_media_dev, subdev_notifier); |
| } |
| |
| /* |
| * Find an asd by fwnode or device name. This is called during |
| * driver load to form the async subdev list and bind them. |
| */ |
| static struct v4l2_async_subdev * |
| find_async_subdev(struct imx_media_dev *imxmd, |
| struct fwnode_handle *fwnode, |
| const char *devname) |
| { |
| struct imx_media_async_subdev *imxasd; |
| struct v4l2_async_subdev *asd; |
| |
| list_for_each_entry(imxasd, &imxmd->asd_list, list) { |
| asd = &imxasd->asd; |
| switch (asd->match_type) { |
| case V4L2_ASYNC_MATCH_FWNODE: |
| if (fwnode && asd->match.fwnode == fwnode) |
| return asd; |
| break; |
| case V4L2_ASYNC_MATCH_DEVNAME: |
| if (devname && !strcmp(asd->match.device_name, |
| devname)) |
| return asd; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| |
| /* |
| * Adds a subdev to the async subdev list. If fwnode is non-NULL, adds |
| * the async as a V4L2_ASYNC_MATCH_FWNODE match type, otherwise as |
| * a V4L2_ASYNC_MATCH_DEVNAME match type using the dev_name of the |
| * given platform_device. This is called during driver load when |
| * forming the async subdev list. |
| */ |
| int imx_media_add_async_subdev(struct imx_media_dev *imxmd, |
| struct fwnode_handle *fwnode, |
| struct platform_device *pdev) |
| { |
| struct device_node *np = to_of_node(fwnode); |
| struct imx_media_async_subdev *imxasd; |
| struct v4l2_async_subdev *asd; |
| const char *devname = NULL; |
| int ret = 0; |
| |
| mutex_lock(&imxmd->mutex); |
| |
| if (pdev) |
| devname = dev_name(&pdev->dev); |
| |
| /* return -EEXIST if this asd already added */ |
| if (find_async_subdev(imxmd, fwnode, devname)) { |
| dev_dbg(imxmd->md.dev, "%s: already added %s\n", |
| __func__, np ? np->name : devname); |
| ret = -EEXIST; |
| goto out; |
| } |
| |
| imxasd = devm_kzalloc(imxmd->md.dev, sizeof(*imxasd), GFP_KERNEL); |
| if (!imxasd) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| asd = &imxasd->asd; |
| |
| if (fwnode) { |
| asd->match_type = V4L2_ASYNC_MATCH_FWNODE; |
| asd->match.fwnode = fwnode; |
| } else { |
| asd->match_type = V4L2_ASYNC_MATCH_DEVNAME; |
| asd->match.device_name = devname; |
| imxasd->pdev = pdev; |
| } |
| |
| list_add_tail(&imxasd->list, &imxmd->asd_list); |
| |
| imxmd->subdev_notifier.num_subdevs++; |
| |
| dev_dbg(imxmd->md.dev, "%s: added %s, match type %s\n", |
| __func__, np ? np->name : devname, np ? "FWNODE" : "DEVNAME"); |
| |
| out: |
| mutex_unlock(&imxmd->mutex); |
| return ret; |
| } |
| |
| /* |
| * get IPU from this CSI and add it to the list of IPUs |
| * the media driver will control. |
| */ |
| static int imx_media_get_ipu(struct imx_media_dev *imxmd, |
| struct v4l2_subdev *csi_sd) |
| { |
| struct ipu_soc *ipu; |
| int ipu_id; |
| |
| ipu = dev_get_drvdata(csi_sd->dev->parent); |
| if (!ipu) { |
| v4l2_err(&imxmd->v4l2_dev, |
| "CSI %s has no parent IPU!\n", csi_sd->name); |
| return -ENODEV; |
| } |
| |
| ipu_id = ipu_get_num(ipu); |
| if (ipu_id > 1) { |
| v4l2_err(&imxmd->v4l2_dev, "invalid IPU id %d!\n", ipu_id); |
| return -ENODEV; |
| } |
| |
| if (!imxmd->ipu[ipu_id]) |
| imxmd->ipu[ipu_id] = ipu; |
| |
| return 0; |
| } |
| |
| /* async subdev bound notifier */ |
| static int imx_media_subdev_bound(struct v4l2_async_notifier *notifier, |
| struct v4l2_subdev *sd, |
| struct v4l2_async_subdev *asd) |
| { |
| struct imx_media_dev *imxmd = notifier2dev(notifier); |
| int ret = 0; |
| |
| mutex_lock(&imxmd->mutex); |
| |
| if (sd->grp_id & IMX_MEDIA_GRP_ID_CSI) { |
| ret = imx_media_get_ipu(imxmd, sd); |
| if (ret) |
| goto out; |
| } |
| |
| v4l2_info(&imxmd->v4l2_dev, "subdev %s bound\n", sd->name); |
| out: |
| mutex_unlock(&imxmd->mutex); |
| return ret; |
| } |
| |
| /* |
| * create the media links for all subdevs that registered async. |
| * Called after all async subdevs have bound. |
| */ |
| static int imx_media_create_links(struct v4l2_async_notifier *notifier) |
| { |
| struct imx_media_dev *imxmd = notifier2dev(notifier); |
| struct v4l2_subdev *sd; |
| int ret; |
| |
| /* |
| * Only links are created between subdevices that are known |
| * to the async notifier. If there are other non-async subdevices, |
| * they were created internally by some subdevice (smiapp is one |
| * example). In those cases it is expected the subdevice is |
| * responsible for creating those internal links. |
| */ |
| list_for_each_entry(sd, ¬ifier->done, async_list) { |
| switch (sd->grp_id) { |
| case IMX_MEDIA_GRP_ID_VDIC: |
| case IMX_MEDIA_GRP_ID_IC_PRP: |
| case IMX_MEDIA_GRP_ID_IC_PRPENC: |
| case IMX_MEDIA_GRP_ID_IC_PRPVF: |
| case IMX_MEDIA_GRP_ID_CSI0: |
| case IMX_MEDIA_GRP_ID_CSI1: |
| ret = imx_media_create_internal_links(imxmd, sd); |
| if (ret) |
| return ret; |
| /* |
| * the CSIs straddle between the external and the IPU |
| * internal entities, so create the external links |
| * to the CSI sink pads. |
| */ |
| if (sd->grp_id & IMX_MEDIA_GRP_ID_CSI) |
| imx_media_create_csi_of_links(imxmd, sd); |
| break; |
| default: |
| /* this is an external fwnode subdev */ |
| imx_media_create_of_links(imxmd, sd); |
| break; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * 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); |
| |
| ret = imx_media_create_links(notifier); |
| if (ret) |
| goto unlock; |
| |
| 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_subdev_ops = { |
| .bound = imx_media_subdev_bound, |
| .complete = imx_media_probe_complete, |
| }; |
| |
| /* |
| * adds controls to a video device from an entity subdevice. |
| * Continues upstream from the entity's sink pads. |
| */ |
| static int imx_media_inherit_controls(struct imx_media_dev *imxmd, |
| struct video_device *vfd, |
| struct media_entity *entity) |
| { |
| int i, ret = 0; |
| |
| if (is_media_entity_v4l2_subdev(entity)) { |
| struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity); |
| |
| dev_dbg(imxmd->md.dev, |
| "adding controls to %s from %s\n", |
| vfd->entity.name, sd->entity.name); |
| |
| ret = v4l2_ctrl_add_handler(vfd->ctrl_handler, |
| sd->ctrl_handler, |
| NULL); |
| if (ret) |
| return ret; |
| } |
| |
| /* move upstream */ |
| for (i = 0; i < entity->num_pads; i++) { |
| struct media_pad *pad, *spad = &entity->pads[i]; |
| |
| if (!(spad->flags & MEDIA_PAD_FL_SINK)) |
| continue; |
| |
| pad = media_entity_remote_pad(spad); |
| if (!pad || !is_media_entity_v4l2_subdev(pad->entity)) |
| continue; |
| |
| ret = imx_media_inherit_controls(imxmd, vfd, pad->entity); |
| if (ret) |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static int imx_media_link_notify(struct media_link *link, u32 flags, |
| unsigned int notification) |
| { |
| struct media_entity *source = link->source->entity; |
| struct imx_media_pad_vdev *pad_vdev; |
| struct list_head *pad_vdev_list; |
| struct imx_media_dev *imxmd; |
| struct video_device *vfd; |
| struct v4l2_subdev *sd; |
| int pad_idx, ret; |
| |
| ret = v4l2_pipeline_link_notify(link, flags, notification); |
| if (ret) |
| return ret; |
| |
| /* don't bother if source is not a subdev */ |
| if (!is_media_entity_v4l2_subdev(source)) |
| return 0; |
| |
| sd = media_entity_to_v4l2_subdev(source); |
| pad_idx = link->source->index; |
| |
| imxmd = dev_get_drvdata(sd->v4l2_dev->dev); |
| |
| pad_vdev_list = to_pad_vdev_list(sd, pad_idx); |
| if (!pad_vdev_list) { |
| /* shouldn't happen, but no reason to fail link setup */ |
| return 0; |
| } |
| |
| /* |
| * Before disabling a link, reset controls for all video |
| * devices reachable from this link. |
| * |
| * After enabling a link, refresh controls for all video |
| * devices reachable from this link. |
| */ |
| if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH && |
| !(flags & MEDIA_LNK_FL_ENABLED)) { |
| list_for_each_entry(pad_vdev, pad_vdev_list, list) { |
| vfd = pad_vdev->vdev->vfd; |
| dev_dbg(imxmd->md.dev, |
| "reset controls for %s\n", |
| vfd->entity.name); |
| v4l2_ctrl_handler_free(vfd->ctrl_handler); |
| v4l2_ctrl_handler_init(vfd->ctrl_handler, 0); |
| } |
| } else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH && |
| (link->flags & MEDIA_LNK_FL_ENABLED)) { |
| list_for_each_entry(pad_vdev, pad_vdev_list, list) { |
| vfd = pad_vdev->vdev->vfd; |
| dev_dbg(imxmd->md.dev, |
| "refresh controls for %s\n", |
| vfd->entity.name); |
| ret = imx_media_inherit_controls(imxmd, vfd, |
| &vfd->entity); |
| if (ret) |
| break; |
| } |
| } |
| |
| return ret; |
| } |
| |
| static const struct media_device_ops imx_media_md_ops = { |
| .link_notify = imx_media_link_notify, |
| }; |
| |
| static int imx_media_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct device_node *node = dev->of_node; |
| struct imx_media_async_subdev *imxasd; |
| struct v4l2_async_subdev **subdevs; |
| struct imx_media_dev *imxmd; |
| int num_subdevs, i, ret; |
| |
| imxmd = devm_kzalloc(dev, sizeof(*imxmd), GFP_KERNEL); |
| if (!imxmd) |
| return -ENOMEM; |
| |
| dev_set_drvdata(dev, imxmd); |
| |
| strlcpy(imxmd->md.model, "imx-media", sizeof(imxmd->md.model)); |
| imxmd->md.ops = &imx_media_md_ops; |
| imxmd->md.dev = dev; |
| |
| mutex_init(&imxmd->mutex); |
| |
| imxmd->v4l2_dev.mdev = &imxmd->md; |
| strlcpy(imxmd->v4l2_dev.name, "imx-media", |
| sizeof(imxmd->v4l2_dev.name)); |
| |
| media_device_init(&imxmd->md); |
| |
| ret = v4l2_device_register(dev, &imxmd->v4l2_dev); |
| if (ret < 0) { |
| v4l2_err(&imxmd->v4l2_dev, |
| "Failed to register v4l2_device: %d\n", ret); |
| goto cleanup; |
| } |
| |
| dev_set_drvdata(imxmd->v4l2_dev.dev, imxmd); |
| |
| INIT_LIST_HEAD(&imxmd->asd_list); |
| INIT_LIST_HEAD(&imxmd->vdev_list); |
| |
| ret = imx_media_add_of_subdevs(imxmd, node); |
| if (ret) { |
| v4l2_err(&imxmd->v4l2_dev, |
| "add_of_subdevs failed with %d\n", ret); |
| goto unreg_dev; |
| } |
| |
| ret = imx_media_add_internal_subdevs(imxmd); |
| if (ret) { |
| v4l2_err(&imxmd->v4l2_dev, |
| "add_internal_subdevs failed with %d\n", ret); |
| goto unreg_dev; |
| } |
| |
| num_subdevs = imxmd->subdev_notifier.num_subdevs; |
| |
| /* no subdevs? just bail */ |
| if (num_subdevs == 0) { |
| ret = -ENODEV; |
| goto unreg_dev; |
| } |
| |
| subdevs = devm_kcalloc(imxmd->md.dev, num_subdevs, sizeof(*subdevs), |
| GFP_KERNEL); |
| if (!subdevs) { |
| ret = -ENOMEM; |
| goto unreg_dev; |
| } |
| |
| i = 0; |
| list_for_each_entry(imxasd, &imxmd->asd_list, list) |
| subdevs[i++] = &imxasd->asd; |
| |
| /* prepare the async subdev notifier and register it */ |
| imxmd->subdev_notifier.subdevs = subdevs; |
| imxmd->subdev_notifier.ops = &imx_media_subdev_ops; |
| ret = v4l2_async_notifier_register(&imxmd->v4l2_dev, |
| &imxmd->subdev_notifier); |
| if (ret) { |
| v4l2_err(&imxmd->v4l2_dev, |
| "v4l2_async_notifier_register failed with %d\n", ret); |
| goto del_int; |
| } |
| |
| return 0; |
| |
| del_int: |
| imx_media_remove_internal_subdevs(imxmd); |
| unreg_dev: |
| v4l2_device_unregister(&imxmd->v4l2_dev); |
| cleanup: |
| media_device_cleanup(&imxmd->md); |
| return ret; |
| } |
| |
| static int imx_media_remove(struct platform_device *pdev) |
| { |
| struct imx_media_dev *imxmd = |
| (struct imx_media_dev *)platform_get_drvdata(pdev); |
| |
| v4l2_info(&imxmd->v4l2_dev, "Removing imx-media\n"); |
| |
| v4l2_async_notifier_unregister(&imxmd->subdev_notifier); |
| imx_media_remove_internal_subdevs(imxmd); |
| v4l2_device_unregister(&imxmd->v4l2_dev); |
| media_device_unregister(&imxmd->md); |
| media_device_cleanup(&imxmd->md); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id imx_media_dt_ids[] = { |
| { .compatible = "fsl,imx-capture-subsystem" }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, imx_media_dt_ids); |
| |
| static struct platform_driver imx_media_pdrv = { |
| .probe = imx_media_probe, |
| .remove = imx_media_remove, |
| .driver = { |
| .name = "imx-media", |
| .of_match_table = imx_media_dt_ids, |
| }, |
| }; |
| |
| module_platform_driver(imx_media_pdrv); |
| |
| MODULE_DESCRIPTION("i.MX5/6 v4l2 media controller driver"); |
| MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@mentor.com>"); |
| MODULE_LICENSE("GPL"); |