1029 lines
24 KiB
C
1029 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Media entity
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*
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* Copyright (C) 2010 Nokia Corporation
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*
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* Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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* Sakari Ailus <sakari.ailus@iki.fi>
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*/
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#include <linux/bitmap.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <media/media-entity.h>
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#include <media/media-device.h>
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static inline const char *gobj_type(enum media_gobj_type type)
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{
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switch (type) {
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case MEDIA_GRAPH_ENTITY:
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return "entity";
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case MEDIA_GRAPH_PAD:
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return "pad";
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case MEDIA_GRAPH_LINK:
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return "link";
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case MEDIA_GRAPH_INTF_DEVNODE:
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return "intf-devnode";
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default:
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return "unknown";
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}
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}
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static inline const char *intf_type(struct media_interface *intf)
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{
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switch (intf->type) {
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case MEDIA_INTF_T_DVB_FE:
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return "dvb-frontend";
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case MEDIA_INTF_T_DVB_DEMUX:
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return "dvb-demux";
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case MEDIA_INTF_T_DVB_DVR:
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return "dvb-dvr";
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case MEDIA_INTF_T_DVB_CA:
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return "dvb-ca";
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case MEDIA_INTF_T_DVB_NET:
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return "dvb-net";
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case MEDIA_INTF_T_V4L_VIDEO:
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return "v4l-video";
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case MEDIA_INTF_T_V4L_VBI:
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return "v4l-vbi";
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case MEDIA_INTF_T_V4L_RADIO:
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return "v4l-radio";
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case MEDIA_INTF_T_V4L_SUBDEV:
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return "v4l-subdev";
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case MEDIA_INTF_T_V4L_SWRADIO:
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return "v4l-swradio";
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case MEDIA_INTF_T_V4L_TOUCH:
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return "v4l-touch";
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default:
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return "unknown-intf";
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}
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};
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__must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum,
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int idx_max)
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{
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idx_max = ALIGN(idx_max, BITS_PER_LONG);
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ent_enum->bmap = kcalloc(idx_max / BITS_PER_LONG, sizeof(long),
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GFP_KERNEL);
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if (!ent_enum->bmap)
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return -ENOMEM;
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bitmap_zero(ent_enum->bmap, idx_max);
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ent_enum->idx_max = idx_max;
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return 0;
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}
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EXPORT_SYMBOL_GPL(__media_entity_enum_init);
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void media_entity_enum_cleanup(struct media_entity_enum *ent_enum)
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{
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kfree(ent_enum->bmap);
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}
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EXPORT_SYMBOL_GPL(media_entity_enum_cleanup);
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/**
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* dev_dbg_obj - Prints in debug mode a change on some object
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*
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* @event_name: Name of the event to report. Could be __func__
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* @gobj: Pointer to the object
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*
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* Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it
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* won't produce any code.
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*/
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static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj)
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{
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#if defined(DEBUG) || defined (CONFIG_DYNAMIC_DEBUG)
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switch (media_type(gobj)) {
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case MEDIA_GRAPH_ENTITY:
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dev_dbg(gobj->mdev->dev,
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"%s id %u: entity '%s'\n",
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event_name, media_id(gobj),
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gobj_to_entity(gobj)->name);
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break;
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case MEDIA_GRAPH_LINK:
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{
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struct media_link *link = gobj_to_link(gobj);
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dev_dbg(gobj->mdev->dev,
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"%s id %u: %s link id %u ==> id %u\n",
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event_name, media_id(gobj),
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media_type(link->gobj0) == MEDIA_GRAPH_PAD ?
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"data" : "interface",
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media_id(link->gobj0),
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media_id(link->gobj1));
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break;
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}
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case MEDIA_GRAPH_PAD:
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{
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struct media_pad *pad = gobj_to_pad(gobj);
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dev_dbg(gobj->mdev->dev,
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"%s id %u: %s%spad '%s':%d\n",
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event_name, media_id(gobj),
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pad->flags & MEDIA_PAD_FL_SINK ? "sink " : "",
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pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "",
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pad->entity->name, pad->index);
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break;
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}
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case MEDIA_GRAPH_INTF_DEVNODE:
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{
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struct media_interface *intf = gobj_to_intf(gobj);
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struct media_intf_devnode *devnode = intf_to_devnode(intf);
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dev_dbg(gobj->mdev->dev,
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"%s id %u: intf_devnode %s - major: %d, minor: %d\n",
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event_name, media_id(gobj),
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intf_type(intf),
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devnode->major, devnode->minor);
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break;
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}
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}
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#endif
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}
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void media_gobj_create(struct media_device *mdev,
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enum media_gobj_type type,
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struct media_gobj *gobj)
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{
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BUG_ON(!mdev);
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gobj->mdev = mdev;
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/* Create a per-type unique object ID */
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gobj->id = media_gobj_gen_id(type, ++mdev->id);
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switch (type) {
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case MEDIA_GRAPH_ENTITY:
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list_add_tail(&gobj->list, &mdev->entities);
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break;
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case MEDIA_GRAPH_PAD:
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list_add_tail(&gobj->list, &mdev->pads);
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break;
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case MEDIA_GRAPH_LINK:
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list_add_tail(&gobj->list, &mdev->links);
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break;
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case MEDIA_GRAPH_INTF_DEVNODE:
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list_add_tail(&gobj->list, &mdev->interfaces);
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break;
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}
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mdev->topology_version++;
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dev_dbg_obj(__func__, gobj);
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}
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void media_gobj_destroy(struct media_gobj *gobj)
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{
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/* Do nothing if the object is not linked. */
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if (gobj->mdev == NULL)
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return;
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dev_dbg_obj(__func__, gobj);
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gobj->mdev->topology_version++;
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/* Remove the object from mdev list */
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list_del(&gobj->list);
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gobj->mdev = NULL;
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}
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/*
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* TODO: Get rid of this.
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*/
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#define MEDIA_ENTITY_MAX_PADS 512
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int media_entity_pads_init(struct media_entity *entity, u16 num_pads,
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struct media_pad *pads)
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{
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struct media_device *mdev = entity->graph_obj.mdev;
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unsigned int i;
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if (num_pads >= MEDIA_ENTITY_MAX_PADS)
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return -E2BIG;
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entity->num_pads = num_pads;
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entity->pads = pads;
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if (mdev)
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mutex_lock(&mdev->graph_mutex);
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for (i = 0; i < num_pads; i++) {
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pads[i].entity = entity;
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pads[i].index = i;
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if (mdev)
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media_gobj_create(mdev, MEDIA_GRAPH_PAD,
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&entity->pads[i].graph_obj);
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}
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if (mdev)
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mutex_unlock(&mdev->graph_mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(media_entity_pads_init);
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/* -----------------------------------------------------------------------------
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* Graph traversal
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*/
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static struct media_entity *
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media_entity_other(struct media_entity *entity, struct media_link *link)
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{
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if (link->source->entity == entity)
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return link->sink->entity;
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else
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return link->source->entity;
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}
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/* push an entity to traversal stack */
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static void stack_push(struct media_graph *graph,
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struct media_entity *entity)
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{
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if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) {
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WARN_ON(1);
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return;
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}
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graph->top++;
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graph->stack[graph->top].link = entity->links.next;
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graph->stack[graph->top].entity = entity;
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}
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static struct media_entity *stack_pop(struct media_graph *graph)
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{
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struct media_entity *entity;
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entity = graph->stack[graph->top].entity;
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graph->top--;
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return entity;
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}
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#define link_top(en) ((en)->stack[(en)->top].link)
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#define stack_top(en) ((en)->stack[(en)->top].entity)
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/**
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* media_graph_walk_init - Allocate resources for graph walk
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* @graph: Media graph structure that will be used to walk the graph
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* @mdev: Media device
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*
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* Reserve resources for graph walk in media device's current
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* state. The memory must be released using
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* media_graph_walk_free().
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*
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* Returns error on failure, zero on success.
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*/
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__must_check int media_graph_walk_init(
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struct media_graph *graph, struct media_device *mdev)
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{
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return media_entity_enum_init(&graph->ent_enum, mdev);
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}
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EXPORT_SYMBOL_GPL(media_graph_walk_init);
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/**
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* media_graph_walk_cleanup - Release resources related to graph walking
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* @graph: Media graph structure that was used to walk the graph
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*/
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void media_graph_walk_cleanup(struct media_graph *graph)
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{
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media_entity_enum_cleanup(&graph->ent_enum);
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}
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EXPORT_SYMBOL_GPL(media_graph_walk_cleanup);
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void media_graph_walk_start(struct media_graph *graph,
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struct media_entity *entity)
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{
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media_entity_enum_zero(&graph->ent_enum);
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media_entity_enum_set(&graph->ent_enum, entity);
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graph->top = 0;
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graph->stack[graph->top].entity = NULL;
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stack_push(graph, entity);
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dev_dbg(entity->graph_obj.mdev->dev,
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"begin graph walk at '%s'\n", entity->name);
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}
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EXPORT_SYMBOL_GPL(media_graph_walk_start);
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static void media_graph_walk_iter(struct media_graph *graph)
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{
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struct media_entity *entity = stack_top(graph);
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struct media_link *link;
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struct media_entity *next;
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link = list_entry(link_top(graph), typeof(*link), list);
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/* The link is not enabled so we do not follow. */
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if (!(link->flags & MEDIA_LNK_FL_ENABLED)) {
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link_top(graph) = link_top(graph)->next;
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dev_dbg(entity->graph_obj.mdev->dev,
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"walk: skipping disabled link '%s':%u -> '%s':%u\n",
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link->source->entity->name, link->source->index,
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link->sink->entity->name, link->sink->index);
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return;
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}
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/* Get the entity in the other end of the link . */
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next = media_entity_other(entity, link);
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/* Has the entity already been visited? */
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if (media_entity_enum_test_and_set(&graph->ent_enum, next)) {
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link_top(graph) = link_top(graph)->next;
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dev_dbg(entity->graph_obj.mdev->dev,
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"walk: skipping entity '%s' (already seen)\n",
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next->name);
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return;
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}
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/* Push the new entity to stack and start over. */
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link_top(graph) = link_top(graph)->next;
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stack_push(graph, next);
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dev_dbg(entity->graph_obj.mdev->dev, "walk: pushing '%s' on stack\n",
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next->name);
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}
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struct media_entity *media_graph_walk_next(struct media_graph *graph)
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{
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struct media_entity *entity;
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if (stack_top(graph) == NULL)
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return NULL;
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/*
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* Depth first search. Push entity to stack and continue from
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* top of the stack until no more entities on the level can be
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* found.
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*/
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while (link_top(graph) != &stack_top(graph)->links)
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media_graph_walk_iter(graph);
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entity = stack_pop(graph);
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dev_dbg(entity->graph_obj.mdev->dev,
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"walk: returning entity '%s'\n", entity->name);
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return entity;
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}
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EXPORT_SYMBOL_GPL(media_graph_walk_next);
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int media_entity_get_fwnode_pad(struct media_entity *entity,
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struct fwnode_handle *fwnode,
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unsigned long direction_flags)
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{
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struct fwnode_endpoint endpoint;
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unsigned int i;
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int ret;
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if (!entity->ops || !entity->ops->get_fwnode_pad) {
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for (i = 0; i < entity->num_pads; i++) {
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if (entity->pads[i].flags & direction_flags)
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return i;
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}
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return -ENXIO;
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}
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ret = fwnode_graph_parse_endpoint(fwnode, &endpoint);
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if (ret)
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return ret;
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ret = entity->ops->get_fwnode_pad(&endpoint);
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if (ret < 0)
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return ret;
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if (ret >= entity->num_pads)
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return -ENXIO;
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if (!(entity->pads[ret].flags & direction_flags))
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return -ENXIO;
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return ret;
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}
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EXPORT_SYMBOL_GPL(media_entity_get_fwnode_pad);
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/* -----------------------------------------------------------------------------
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* Pipeline management
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*/
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__must_check int __media_pipeline_start(struct media_entity *entity,
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struct media_pipeline *pipe)
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{
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struct media_device *mdev = entity->graph_obj.mdev;
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struct media_graph *graph = &pipe->graph;
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struct media_entity *entity_err = entity;
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struct media_link *link;
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int ret;
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if (!pipe->streaming_count++) {
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ret = media_graph_walk_init(&pipe->graph, mdev);
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if (ret)
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goto error_graph_walk_start;
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}
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media_graph_walk_start(&pipe->graph, entity);
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while ((entity = media_graph_walk_next(graph))) {
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DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS);
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DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS);
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entity->stream_count++;
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if (entity->pipe && entity->pipe != pipe) {
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pr_err("Pipe active for %s. Can't start for %s\n",
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entity->name,
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entity_err->name);
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ret = -EBUSY;
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goto error;
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}
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entity->pipe = pipe;
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/* Already streaming --- no need to check. */
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if (entity->stream_count > 1)
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continue;
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if (!entity->ops || !entity->ops->link_validate)
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continue;
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bitmap_zero(active, entity->num_pads);
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bitmap_fill(has_no_links, entity->num_pads);
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list_for_each_entry(link, &entity->links, list) {
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struct media_pad *pad = link->sink->entity == entity
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? link->sink : link->source;
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|
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/* Mark that a pad is connected by a link. */
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bitmap_clear(has_no_links, pad->index, 1);
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|
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/*
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* Pads that either do not need to connect or
|
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* are connected through an enabled link are
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* fine.
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*/
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if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) ||
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link->flags & MEDIA_LNK_FL_ENABLED)
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bitmap_set(active, pad->index, 1);
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|
|
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/*
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* Link validation will only take place for
|
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* sink ends of the link that are enabled.
|
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*/
|
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if (link->sink != pad ||
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!(link->flags & MEDIA_LNK_FL_ENABLED))
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continue;
|
|
|
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ret = entity->ops->link_validate(link);
|
|
if (ret < 0 && ret != -ENOIOCTLCMD) {
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|
dev_dbg(entity->graph_obj.mdev->dev,
|
|
"link validation failed for '%s':%u -> '%s':%u, error %d\n",
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link->source->entity->name,
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link->source->index,
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entity->name, link->sink->index, ret);
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goto error;
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|
}
|
|
}
|
|
|
|
/* Either no links or validated links are fine. */
|
|
bitmap_or(active, active, has_no_links, entity->num_pads);
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|
|
if (!bitmap_full(active, entity->num_pads)) {
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ret = -ENOLINK;
|
|
dev_dbg(entity->graph_obj.mdev->dev,
|
|
"'%s':%u must be connected by an enabled link\n",
|
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entity->name,
|
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(unsigned)find_first_zero_bit(
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active, entity->num_pads));
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goto error;
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|
}
|
|
}
|
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|
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return 0;
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|
|
|
error:
|
|
/*
|
|
* Link validation on graph failed. We revert what we did and
|
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* return the error.
|
|
*/
|
|
media_graph_walk_start(graph, entity_err);
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|
|
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while ((entity_err = media_graph_walk_next(graph))) {
|
|
/* Sanity check for negative stream_count */
|
|
if (!WARN_ON_ONCE(entity_err->stream_count <= 0)) {
|
|
entity_err->stream_count--;
|
|
if (entity_err->stream_count == 0)
|
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entity_err->pipe = NULL;
|
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}
|
|
|
|
/*
|
|
* We haven't increased stream_count further than this
|
|
* so we quit here.
|
|
*/
|
|
if (entity_err == entity)
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break;
|
|
}
|
|
|
|
error_graph_walk_start:
|
|
if (!--pipe->streaming_count)
|
|
media_graph_walk_cleanup(graph);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_pipeline_start);
|
|
|
|
__must_check int media_pipeline_start(struct media_entity *entity,
|
|
struct media_pipeline *pipe)
|
|
{
|
|
struct media_device *mdev = entity->graph_obj.mdev;
|
|
int ret;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
ret = __media_pipeline_start(entity, pipe);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_pipeline_start);
|
|
|
|
void __media_pipeline_stop(struct media_entity *entity)
|
|
{
|
|
struct media_graph *graph = &entity->pipe->graph;
|
|
struct media_pipeline *pipe = entity->pipe;
|
|
|
|
/*
|
|
* If the following check fails, the driver has performed an
|
|
* unbalanced call to media_pipeline_stop()
|
|
*/
|
|
if (WARN_ON(!pipe))
|
|
return;
|
|
|
|
media_graph_walk_start(graph, entity);
|
|
|
|
while ((entity = media_graph_walk_next(graph))) {
|
|
/* Sanity check for negative stream_count */
|
|
if (!WARN_ON_ONCE(entity->stream_count <= 0)) {
|
|
entity->stream_count--;
|
|
if (entity->stream_count == 0)
|
|
entity->pipe = NULL;
|
|
}
|
|
}
|
|
|
|
if (!--pipe->streaming_count)
|
|
media_graph_walk_cleanup(graph);
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_pipeline_stop);
|
|
|
|
void media_pipeline_stop(struct media_entity *entity)
|
|
{
|
|
struct media_device *mdev = entity->graph_obj.mdev;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
__media_pipeline_stop(entity);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_pipeline_stop);
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* Links management
|
|
*/
|
|
|
|
static struct media_link *media_add_link(struct list_head *head)
|
|
{
|
|
struct media_link *link;
|
|
|
|
link = kzalloc(sizeof(*link), GFP_KERNEL);
|
|
if (link == NULL)
|
|
return NULL;
|
|
|
|
list_add_tail(&link->list, head);
|
|
|
|
return link;
|
|
}
|
|
|
|
static void __media_entity_remove_link(struct media_entity *entity,
|
|
struct media_link *link)
|
|
{
|
|
struct media_link *rlink, *tmp;
|
|
struct media_entity *remote;
|
|
|
|
if (link->source->entity == entity)
|
|
remote = link->sink->entity;
|
|
else
|
|
remote = link->source->entity;
|
|
|
|
list_for_each_entry_safe(rlink, tmp, &remote->links, list) {
|
|
if (rlink != link->reverse)
|
|
continue;
|
|
|
|
if (link->source->entity == entity)
|
|
remote->num_backlinks--;
|
|
|
|
/* Remove the remote link */
|
|
list_del(&rlink->list);
|
|
media_gobj_destroy(&rlink->graph_obj);
|
|
kfree(rlink);
|
|
|
|
if (--remote->num_links == 0)
|
|
break;
|
|
}
|
|
list_del(&link->list);
|
|
media_gobj_destroy(&link->graph_obj);
|
|
kfree(link);
|
|
}
|
|
|
|
int media_get_pad_index(struct media_entity *entity, bool is_sink,
|
|
enum media_pad_signal_type sig_type)
|
|
{
|
|
int i;
|
|
bool pad_is_sink;
|
|
|
|
if (!entity)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < entity->num_pads; i++) {
|
|
if (entity->pads[i].flags & MEDIA_PAD_FL_SINK)
|
|
pad_is_sink = true;
|
|
else if (entity->pads[i].flags & MEDIA_PAD_FL_SOURCE)
|
|
pad_is_sink = false;
|
|
else
|
|
continue; /* This is an error! */
|
|
|
|
if (pad_is_sink != is_sink)
|
|
continue;
|
|
if (entity->pads[i].sig_type == sig_type)
|
|
return i;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_get_pad_index);
|
|
|
|
int
|
|
media_create_pad_link(struct media_entity *source, u16 source_pad,
|
|
struct media_entity *sink, u16 sink_pad, u32 flags)
|
|
{
|
|
struct media_link *link;
|
|
struct media_link *backlink;
|
|
|
|
BUG_ON(source == NULL || sink == NULL);
|
|
BUG_ON(source_pad >= source->num_pads);
|
|
BUG_ON(sink_pad >= sink->num_pads);
|
|
|
|
link = media_add_link(&source->links);
|
|
if (link == NULL)
|
|
return -ENOMEM;
|
|
|
|
link->source = &source->pads[source_pad];
|
|
link->sink = &sink->pads[sink_pad];
|
|
link->flags = flags & ~MEDIA_LNK_FL_INTERFACE_LINK;
|
|
|
|
/* Initialize graph object embedded at the new link */
|
|
media_gobj_create(source->graph_obj.mdev, MEDIA_GRAPH_LINK,
|
|
&link->graph_obj);
|
|
|
|
/* Create the backlink. Backlinks are used to help graph traversal and
|
|
* are not reported to userspace.
|
|
*/
|
|
backlink = media_add_link(&sink->links);
|
|
if (backlink == NULL) {
|
|
__media_entity_remove_link(source, link);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
backlink->source = &source->pads[source_pad];
|
|
backlink->sink = &sink->pads[sink_pad];
|
|
backlink->flags = flags;
|
|
backlink->is_backlink = true;
|
|
|
|
/* Initialize graph object embedded at the new link */
|
|
media_gobj_create(sink->graph_obj.mdev, MEDIA_GRAPH_LINK,
|
|
&backlink->graph_obj);
|
|
|
|
link->reverse = backlink;
|
|
backlink->reverse = link;
|
|
|
|
sink->num_backlinks++;
|
|
sink->num_links++;
|
|
source->num_links++;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_create_pad_link);
|
|
|
|
int media_create_pad_links(const struct media_device *mdev,
|
|
const u32 source_function,
|
|
struct media_entity *source,
|
|
const u16 source_pad,
|
|
const u32 sink_function,
|
|
struct media_entity *sink,
|
|
const u16 sink_pad,
|
|
u32 flags,
|
|
const bool allow_both_undefined)
|
|
{
|
|
struct media_entity *entity;
|
|
unsigned function;
|
|
int ret;
|
|
|
|
/* Trivial case: 1:1 relation */
|
|
if (source && sink)
|
|
return media_create_pad_link(source, source_pad,
|
|
sink, sink_pad, flags);
|
|
|
|
/* Worse case scenario: n:n relation */
|
|
if (!source && !sink) {
|
|
if (!allow_both_undefined)
|
|
return 0;
|
|
media_device_for_each_entity(source, mdev) {
|
|
if (source->function != source_function)
|
|
continue;
|
|
media_device_for_each_entity(sink, mdev) {
|
|
if (sink->function != sink_function)
|
|
continue;
|
|
ret = media_create_pad_link(source, source_pad,
|
|
sink, sink_pad,
|
|
flags);
|
|
if (ret)
|
|
return ret;
|
|
flags &= ~(MEDIA_LNK_FL_ENABLED |
|
|
MEDIA_LNK_FL_IMMUTABLE);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Handle 1:n and n:1 cases */
|
|
if (source)
|
|
function = sink_function;
|
|
else
|
|
function = source_function;
|
|
|
|
media_device_for_each_entity(entity, mdev) {
|
|
if (entity->function != function)
|
|
continue;
|
|
|
|
if (source)
|
|
ret = media_create_pad_link(source, source_pad,
|
|
entity, sink_pad, flags);
|
|
else
|
|
ret = media_create_pad_link(entity, source_pad,
|
|
sink, sink_pad, flags);
|
|
if (ret)
|
|
return ret;
|
|
flags &= ~(MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_create_pad_links);
|
|
|
|
void __media_entity_remove_links(struct media_entity *entity)
|
|
{
|
|
struct media_link *link, *tmp;
|
|
|
|
list_for_each_entry_safe(link, tmp, &entity->links, list)
|
|
__media_entity_remove_link(entity, link);
|
|
|
|
entity->num_links = 0;
|
|
entity->num_backlinks = 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_entity_remove_links);
|
|
|
|
void media_entity_remove_links(struct media_entity *entity)
|
|
{
|
|
struct media_device *mdev = entity->graph_obj.mdev;
|
|
|
|
/* Do nothing if the entity is not registered. */
|
|
if (mdev == NULL)
|
|
return;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
__media_entity_remove_links(entity);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_remove_links);
|
|
|
|
static int __media_entity_setup_link_notify(struct media_link *link, u32 flags)
|
|
{
|
|
int ret;
|
|
|
|
/* Notify both entities. */
|
|
ret = media_entity_call(link->source->entity, link_setup,
|
|
link->source, link->sink, flags);
|
|
if (ret < 0 && ret != -ENOIOCTLCMD)
|
|
return ret;
|
|
|
|
ret = media_entity_call(link->sink->entity, link_setup,
|
|
link->sink, link->source, flags);
|
|
if (ret < 0 && ret != -ENOIOCTLCMD) {
|
|
media_entity_call(link->source->entity, link_setup,
|
|
link->source, link->sink, link->flags);
|
|
return ret;
|
|
}
|
|
|
|
link->flags = flags;
|
|
link->reverse->flags = link->flags;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __media_entity_setup_link(struct media_link *link, u32 flags)
|
|
{
|
|
const u32 mask = MEDIA_LNK_FL_ENABLED;
|
|
struct media_device *mdev;
|
|
struct media_entity *source, *sink;
|
|
int ret = -EBUSY;
|
|
|
|
if (link == NULL)
|
|
return -EINVAL;
|
|
|
|
/* The non-modifiable link flags must not be modified. */
|
|
if ((link->flags & ~mask) != (flags & ~mask))
|
|
return -EINVAL;
|
|
|
|
if (link->flags & MEDIA_LNK_FL_IMMUTABLE)
|
|
return link->flags == flags ? 0 : -EINVAL;
|
|
|
|
if (link->flags == flags)
|
|
return 0;
|
|
|
|
source = link->source->entity;
|
|
sink = link->sink->entity;
|
|
|
|
if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) &&
|
|
(source->stream_count || sink->stream_count))
|
|
return -EBUSY;
|
|
|
|
mdev = source->graph_obj.mdev;
|
|
|
|
if (mdev->ops && mdev->ops->link_notify) {
|
|
ret = mdev->ops->link_notify(link, flags,
|
|
MEDIA_DEV_NOTIFY_PRE_LINK_CH);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
ret = __media_entity_setup_link_notify(link, flags);
|
|
|
|
if (mdev->ops && mdev->ops->link_notify)
|
|
mdev->ops->link_notify(link, flags,
|
|
MEDIA_DEV_NOTIFY_POST_LINK_CH);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_entity_setup_link);
|
|
|
|
int media_entity_setup_link(struct media_link *link, u32 flags)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&link->graph_obj.mdev->graph_mutex);
|
|
ret = __media_entity_setup_link(link, flags);
|
|
mutex_unlock(&link->graph_obj.mdev->graph_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_setup_link);
|
|
|
|
struct media_link *
|
|
media_entity_find_link(struct media_pad *source, struct media_pad *sink)
|
|
{
|
|
struct media_link *link;
|
|
|
|
list_for_each_entry(link, &source->entity->links, list) {
|
|
if (link->source->entity == source->entity &&
|
|
link->source->index == source->index &&
|
|
link->sink->entity == sink->entity &&
|
|
link->sink->index == sink->index)
|
|
return link;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_find_link);
|
|
|
|
struct media_pad *media_entity_remote_pad(const struct media_pad *pad)
|
|
{
|
|
struct media_link *link;
|
|
|
|
list_for_each_entry(link, &pad->entity->links, list) {
|
|
if (!(link->flags & MEDIA_LNK_FL_ENABLED))
|
|
continue;
|
|
|
|
if (link->source == pad)
|
|
return link->sink;
|
|
|
|
if (link->sink == pad)
|
|
return link->source;
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_entity_remote_pad);
|
|
|
|
static void media_interface_init(struct media_device *mdev,
|
|
struct media_interface *intf,
|
|
u32 gobj_type,
|
|
u32 intf_type, u32 flags)
|
|
{
|
|
intf->type = intf_type;
|
|
intf->flags = flags;
|
|
INIT_LIST_HEAD(&intf->links);
|
|
|
|
media_gobj_create(mdev, gobj_type, &intf->graph_obj);
|
|
}
|
|
|
|
/* Functions related to the media interface via device nodes */
|
|
|
|
struct media_intf_devnode *media_devnode_create(struct media_device *mdev,
|
|
u32 type, u32 flags,
|
|
u32 major, u32 minor)
|
|
{
|
|
struct media_intf_devnode *devnode;
|
|
|
|
devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
|
|
if (!devnode)
|
|
return NULL;
|
|
|
|
devnode->major = major;
|
|
devnode->minor = minor;
|
|
|
|
media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE,
|
|
type, flags);
|
|
|
|
return devnode;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_devnode_create);
|
|
|
|
void media_devnode_remove(struct media_intf_devnode *devnode)
|
|
{
|
|
media_remove_intf_links(&devnode->intf);
|
|
media_gobj_destroy(&devnode->intf.graph_obj);
|
|
kfree(devnode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_devnode_remove);
|
|
|
|
struct media_link *media_create_intf_link(struct media_entity *entity,
|
|
struct media_interface *intf,
|
|
u32 flags)
|
|
{
|
|
struct media_link *link;
|
|
|
|
link = media_add_link(&intf->links);
|
|
if (link == NULL)
|
|
return NULL;
|
|
|
|
link->intf = intf;
|
|
link->entity = entity;
|
|
link->flags = flags | MEDIA_LNK_FL_INTERFACE_LINK;
|
|
|
|
/* Initialize graph object embedded at the new link */
|
|
media_gobj_create(intf->graph_obj.mdev, MEDIA_GRAPH_LINK,
|
|
&link->graph_obj);
|
|
|
|
return link;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_create_intf_link);
|
|
|
|
void __media_remove_intf_link(struct media_link *link)
|
|
{
|
|
list_del(&link->list);
|
|
media_gobj_destroy(&link->graph_obj);
|
|
kfree(link);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_remove_intf_link);
|
|
|
|
void media_remove_intf_link(struct media_link *link)
|
|
{
|
|
struct media_device *mdev = link->graph_obj.mdev;
|
|
|
|
/* Do nothing if the intf is not registered. */
|
|
if (mdev == NULL)
|
|
return;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
__media_remove_intf_link(link);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_remove_intf_link);
|
|
|
|
void __media_remove_intf_links(struct media_interface *intf)
|
|
{
|
|
struct media_link *link, *tmp;
|
|
|
|
list_for_each_entry_safe(link, tmp, &intf->links, list)
|
|
__media_remove_intf_link(link);
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_remove_intf_links);
|
|
|
|
void media_remove_intf_links(struct media_interface *intf)
|
|
{
|
|
struct media_device *mdev = intf->graph_obj.mdev;
|
|
|
|
/* Do nothing if the intf is not registered. */
|
|
if (mdev == NULL)
|
|
return;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
__media_remove_intf_links(intf);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_remove_intf_links);
|