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1033 lines
24 KiB
1033 lines
24 KiB
// 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 <[email protected]> |
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* Sakari Ailus <[email protected]> |
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*/ |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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/** |
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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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|
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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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|
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gobj->mdev = mdev; |
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|
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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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|
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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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|
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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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|
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gobj->mdev = NULL; |
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} |
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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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|
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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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|
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if (num_pads >= MEDIA_ENTITY_MAX_PADS) |
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return -E2BIG; |
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|
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entity->num_pads = num_pads; |
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entity->pads = pads; |
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|
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if (mdev) |
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mutex_lock(&mdev->graph_mutex); |
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|
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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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|
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if (mdev) |
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mutex_unlock(&mdev->graph_mutex); |
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|
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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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/* ----------------------------------------------------------------------------- |
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* Graph traversal |
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*/ |
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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); |
|
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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|
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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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|
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entity = graph->stack[graph->top].entity; |
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graph->top--; |
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|
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return entity; |
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} |
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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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|
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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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|
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link = list_entry(link_top(graph), typeof(*link), list); |
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|
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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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|
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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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/* 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; |
|
|
|
if (stack_top(graph) == NULL) |
|
return NULL; |
|
|
|
/* |
|
* Depth first search. Push entity to stack and continue from |
|
* top of the stack until no more entities on the level can be |
|
* found. |
|
*/ |
|
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); |
|
|
|
return entity; |
|
} |
|
EXPORT_SYMBOL_GPL(media_graph_walk_next); |
|
|
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int media_entity_get_fwnode_pad(struct media_entity *entity, |
|
struct fwnode_handle *fwnode, |
|
unsigned long direction_flags) |
|
{ |
|
struct fwnode_endpoint endpoint; |
|
unsigned int i; |
|
int ret; |
|
|
|
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) |
|
return i; |
|
} |
|
|
|
return -ENXIO; |
|
} |
|
|
|
ret = fwnode_graph_parse_endpoint(fwnode, &endpoint); |
|
if (ret) |
|
return ret; |
|
|
|
ret = entity->ops->get_fwnode_pad(entity, &endpoint); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (ret >= entity->num_pads) |
|
return -ENXIO; |
|
|
|
if (!(entity->pads[ret].flags & direction_flags)) |
|
return -ENXIO; |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(media_entity_get_fwnode_pad); |
|
|
|
/* ----------------------------------------------------------------------------- |
|
* Pipeline management |
|
*/ |
|
|
|
__must_check int __media_pipeline_start(struct media_entity *entity, |
|
struct media_pipeline *pipe) |
|
{ |
|
struct media_device *mdev = entity->graph_obj.mdev; |
|
struct media_graph *graph = &pipe->graph; |
|
struct media_entity *entity_err = entity; |
|
struct media_link *link; |
|
int ret; |
|
|
|
if (!pipe->streaming_count++) { |
|
ret = media_graph_walk_init(&pipe->graph, mdev); |
|
if (ret) |
|
goto error_graph_walk_start; |
|
} |
|
|
|
media_graph_walk_start(&pipe->graph, entity); |
|
|
|
while ((entity = media_graph_walk_next(graph))) { |
|
DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS); |
|
DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS); |
|
|
|
entity->stream_count++; |
|
|
|
if (entity->pipe && entity->pipe != pipe) { |
|
pr_err("Pipe active for %s. Can't start for %s\n", |
|
entity->name, |
|
entity_err->name); |
|
ret = -EBUSY; |
|
goto error; |
|
} |
|
|
|
entity->pipe = pipe; |
|
|
|
/* Already streaming --- no need to check. */ |
|
if (entity->stream_count > 1) |
|
continue; |
|
|
|
if (!entity->ops || !entity->ops->link_validate) |
|
continue; |
|
|
|
bitmap_zero(active, entity->num_pads); |
|
bitmap_fill(has_no_links, entity->num_pads); |
|
|
|
list_for_each_entry(link, &entity->links, list) { |
|
struct media_pad *pad = link->sink->entity == entity |
|
? link->sink : link->source; |
|
|
|
/* Mark that a pad is connected by a link. */ |
|
bitmap_clear(has_no_links, pad->index, 1); |
|
|
|
/* |
|
* Pads that either do not need to connect or |
|
* are connected through an enabled link are |
|
* fine. |
|
*/ |
|
if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) || |
|
link->flags & MEDIA_LNK_FL_ENABLED) |
|
bitmap_set(active, pad->index, 1); |
|
|
|
/* |
|
* Link validation will only take place for |
|
* sink ends of the link that are enabled. |
|
*/ |
|
if (link->sink != pad || |
|
!(link->flags & MEDIA_LNK_FL_ENABLED)) |
|
continue; |
|
|
|
ret = entity->ops->link_validate(link); |
|
if (ret < 0 && ret != -ENOIOCTLCMD) { |
|
dev_dbg(entity->graph_obj.mdev->dev, |
|
"link validation failed for '%s':%u -> '%s':%u, error %d\n", |
|
link->source->entity->name, |
|
link->source->index, |
|
entity->name, link->sink->index, ret); |
|
goto error; |
|
} |
|
} |
|
|
|
/* Either no links or validated links are fine. */ |
|
bitmap_or(active, active, has_no_links, entity->num_pads); |
|
|
|
if (!bitmap_full(active, entity->num_pads)) { |
|
ret = -ENOLINK; |
|
dev_dbg(entity->graph_obj.mdev->dev, |
|
"'%s':%u must be connected by an enabled link\n", |
|
entity->name, |
|
(unsigned)find_first_zero_bit( |
|
active, entity->num_pads)); |
|
goto error; |
|
} |
|
} |
|
|
|
return 0; |
|
|
|
error: |
|
/* |
|
* Link validation on graph failed. We revert what we did and |
|
* return the error. |
|
*/ |
|
media_graph_walk_start(graph, entity_err); |
|
|
|
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) |
|
entity_err->pipe = NULL; |
|
} |
|
|
|
/* |
|
* We haven't increased stream_count further than this |
|
* so we quit here. |
|
*/ |
|
if (entity_err == entity) |
|
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; |
|
|
|
if (WARN_ON(!source || !sink) || |
|
WARN_ON(source_pad >= source->num_pads) || |
|
WARN_ON(sink_pad >= sink->num_pads)) |
|
return -EINVAL; |
|
if (WARN_ON(!(source->pads[source_pad].flags & MEDIA_PAD_FL_SOURCE))) |
|
return -EINVAL; |
|
if (WARN_ON(!(sink->pads[sink_pad].flags & MEDIA_PAD_FL_SINK))) |
|
return -EINVAL; |
|
|
|
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);
|
|
|