| /* |
| * Media entity |
| * |
| * Copyright (C) 2010 Nokia Corporation |
| * |
| * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> |
| * Sakari Ailus <sakari.ailus@iki.fi> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/bitmap.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <media/media-entity.h> |
| #include <media/media-device.h> |
| |
| static inline const char *gobj_type(enum media_gobj_type type) |
| { |
| switch (type) { |
| case MEDIA_GRAPH_ENTITY: |
| return "entity"; |
| case MEDIA_GRAPH_PAD: |
| return "pad"; |
| case MEDIA_GRAPH_LINK: |
| return "link"; |
| case MEDIA_GRAPH_INTF_DEVNODE: |
| return "intf-devnode"; |
| default: |
| return "unknown"; |
| } |
| } |
| |
| static inline const char *intf_type(struct media_interface *intf) |
| { |
| switch (intf->type) { |
| case MEDIA_INTF_T_DVB_FE: |
| return "dvb-frontend"; |
| case MEDIA_INTF_T_DVB_DEMUX: |
| return "dvb-demux"; |
| case MEDIA_INTF_T_DVB_DVR: |
| return "dvb-dvr"; |
| case MEDIA_INTF_T_DVB_CA: |
| return "dvb-ca"; |
| case MEDIA_INTF_T_DVB_NET: |
| return "dvb-net"; |
| case MEDIA_INTF_T_V4L_VIDEO: |
| return "v4l-video"; |
| case MEDIA_INTF_T_V4L_VBI: |
| return "v4l-vbi"; |
| case MEDIA_INTF_T_V4L_RADIO: |
| return "v4l-radio"; |
| case MEDIA_INTF_T_V4L_SUBDEV: |
| return "v4l-subdev"; |
| case MEDIA_INTF_T_V4L_SWRADIO: |
| return "v4l-swradio"; |
| case MEDIA_INTF_T_V4L_TOUCH: |
| return "v4l-touch"; |
| case MEDIA_INTF_T_ALSA_PCM_CAPTURE: |
| return "alsa-pcm-capture"; |
| case MEDIA_INTF_T_ALSA_PCM_PLAYBACK: |
| return "alsa-pcm-playback"; |
| case MEDIA_INTF_T_ALSA_CONTROL: |
| return "alsa-control"; |
| case MEDIA_INTF_T_ALSA_COMPRESS: |
| return "alsa-compress"; |
| case MEDIA_INTF_T_ALSA_RAWMIDI: |
| return "alsa-rawmidi"; |
| case MEDIA_INTF_T_ALSA_HWDEP: |
| return "alsa-hwdep"; |
| case MEDIA_INTF_T_ALSA_SEQUENCER: |
| return "alsa-sequencer"; |
| case MEDIA_INTF_T_ALSA_TIMER: |
| return "alsa-timer"; |
| default: |
| return "unknown-intf"; |
| } |
| }; |
| |
| __must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum, |
| int idx_max) |
| { |
| idx_max = ALIGN(idx_max, BITS_PER_LONG); |
| ent_enum->bmap = kcalloc(idx_max / BITS_PER_LONG, sizeof(long), |
| GFP_KERNEL); |
| if (!ent_enum->bmap) |
| return -ENOMEM; |
| |
| bitmap_zero(ent_enum->bmap, idx_max); |
| ent_enum->idx_max = idx_max; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(__media_entity_enum_init); |
| |
| void media_entity_enum_cleanup(struct media_entity_enum *ent_enum) |
| { |
| kfree(ent_enum->bmap); |
| } |
| EXPORT_SYMBOL_GPL(media_entity_enum_cleanup); |
| |
| /** |
| * dev_dbg_obj - Prints in debug mode a change on some object |
| * |
| * @event_name: Name of the event to report. Could be __func__ |
| * @gobj: Pointer to the object |
| * |
| * Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it |
| * won't produce any code. |
| */ |
| static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj) |
| { |
| #if defined(DEBUG) || defined (CONFIG_DYNAMIC_DEBUG) |
| switch (media_type(gobj)) { |
| case MEDIA_GRAPH_ENTITY: |
| dev_dbg(gobj->mdev->dev, |
| "%s id %u: entity '%s'\n", |
| event_name, media_id(gobj), |
| gobj_to_entity(gobj)->name); |
| break; |
| case MEDIA_GRAPH_LINK: |
| { |
| struct media_link *link = gobj_to_link(gobj); |
| |
| dev_dbg(gobj->mdev->dev, |
| "%s id %u: %s link id %u ==> id %u\n", |
| event_name, media_id(gobj), |
| media_type(link->gobj0) == MEDIA_GRAPH_PAD ? |
| "data" : "interface", |
| media_id(link->gobj0), |
| media_id(link->gobj1)); |
| break; |
| } |
| case MEDIA_GRAPH_PAD: |
| { |
| struct media_pad *pad = gobj_to_pad(gobj); |
| |
| dev_dbg(gobj->mdev->dev, |
| "%s id %u: %s%spad '%s':%d\n", |
| event_name, media_id(gobj), |
| pad->flags & MEDIA_PAD_FL_SINK ? "sink " : "", |
| pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "", |
| pad->entity->name, pad->index); |
| break; |
| } |
| case MEDIA_GRAPH_INTF_DEVNODE: |
| { |
| struct media_interface *intf = gobj_to_intf(gobj); |
| struct media_intf_devnode *devnode = intf_to_devnode(intf); |
| |
| dev_dbg(gobj->mdev->dev, |
| "%s id %u: intf_devnode %s - major: %d, minor: %d\n", |
| event_name, media_id(gobj), |
| intf_type(intf), |
| devnode->major, devnode->minor); |
| break; |
| } |
| } |
| #endif |
| } |
| |
| void media_gobj_create(struct media_device *mdev, |
| enum media_gobj_type type, |
| struct media_gobj *gobj) |
| { |
| BUG_ON(!mdev); |
| |
| gobj->mdev = mdev; |
| |
| /* Create a per-type unique object ID */ |
| gobj->id = media_gobj_gen_id(type, ++mdev->id); |
| |
| switch (type) { |
| case MEDIA_GRAPH_ENTITY: |
| list_add_tail(&gobj->list, &mdev->entities); |
| break; |
| case MEDIA_GRAPH_PAD: |
| list_add_tail(&gobj->list, &mdev->pads); |
| break; |
| case MEDIA_GRAPH_LINK: |
| list_add_tail(&gobj->list, &mdev->links); |
| break; |
| case MEDIA_GRAPH_INTF_DEVNODE: |
| list_add_tail(&gobj->list, &mdev->interfaces); |
| break; |
| } |
| |
| mdev->topology_version++; |
| |
| dev_dbg_obj(__func__, gobj); |
| } |
| |
| void media_gobj_destroy(struct media_gobj *gobj) |
| { |
| dev_dbg_obj(__func__, gobj); |
| |
| /* Do nothing if the object is not linked. */ |
| if (gobj->mdev == NULL) |
| return; |
| |
| gobj->mdev->topology_version++; |
| |
| /* Remove the object from mdev list */ |
| list_del(&gobj->list); |
| |
| gobj->mdev = NULL; |
| } |
| |
| int media_entity_pads_init(struct media_entity *entity, u16 num_pads, |
| struct media_pad *pads) |
| { |
| struct media_device *mdev = entity->graph_obj.mdev; |
| unsigned int i; |
| |
| entity->num_pads = num_pads; |
| entity->pads = pads; |
| |
| if (mdev) |
| mutex_lock(&mdev->graph_mutex); |
| |
| for (i = 0; i < num_pads; i++) { |
| pads[i].entity = entity; |
| pads[i].index = i; |
| if (mdev) |
| media_gobj_create(mdev, MEDIA_GRAPH_PAD, |
| &entity->pads[i].graph_obj); |
| } |
| |
| if (mdev) |
| mutex_unlock(&mdev->graph_mutex); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(media_entity_pads_init); |
| |
| /* ----------------------------------------------------------------------------- |
| * Graph traversal |
| */ |
| |
| static struct media_entity * |
| media_entity_other(struct media_entity *entity, struct media_link *link) |
| { |
| if (link->source->entity == entity) |
| return link->sink->entity; |
| else |
| return link->source->entity; |
| } |
| |
| /* push an entity to traversal stack */ |
| static void stack_push(struct media_graph *graph, |
| struct media_entity *entity) |
| { |
| if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) { |
| WARN_ON(1); |
| return; |
| } |
| graph->top++; |
| graph->stack[graph->top].link = entity->links.next; |
| graph->stack[graph->top].entity = entity; |
| } |
| |
| static struct media_entity *stack_pop(struct media_graph *graph) |
| { |
| struct media_entity *entity; |
| |
| entity = graph->stack[graph->top].entity; |
| graph->top--; |
| |
| return entity; |
| } |
| |
| #define link_top(en) ((en)->stack[(en)->top].link) |
| #define stack_top(en) ((en)->stack[(en)->top].entity) |
| |
| /* |
| * TODO: Get rid of this. |
| */ |
| #define MEDIA_ENTITY_MAX_PADS 512 |
| |
| /** |
| * media_graph_walk_init - Allocate resources for graph walk |
| * @graph: Media graph structure that will be used to walk the graph |
| * @mdev: Media device |
| * |
| * Reserve resources for graph walk in media device's current |
| * state. The memory must be released using |
| * media_graph_walk_free(). |
| * |
| * Returns error on failure, zero on success. |
| */ |
| __must_check int media_graph_walk_init( |
| struct media_graph *graph, struct media_device *mdev) |
| { |
| return media_entity_enum_init(&graph->ent_enum, mdev); |
| } |
| EXPORT_SYMBOL_GPL(media_graph_walk_init); |
| |
| /** |
| * media_graph_walk_cleanup - Release resources related to graph walking |
| * @graph: Media graph structure that was used to walk the graph |
| */ |
| void media_graph_walk_cleanup(struct media_graph *graph) |
| { |
| media_entity_enum_cleanup(&graph->ent_enum); |
| } |
| EXPORT_SYMBOL_GPL(media_graph_walk_cleanup); |
| |
| void media_graph_walk_start(struct media_graph *graph, |
| struct media_entity *entity) |
| { |
| media_entity_enum_zero(&graph->ent_enum); |
| media_entity_enum_set(&graph->ent_enum, entity); |
| |
| graph->top = 0; |
| graph->stack[graph->top].entity = NULL; |
| stack_push(graph, entity); |
| } |
| EXPORT_SYMBOL_GPL(media_graph_walk_start); |
| |
| static void media_graph_walk_iter(struct media_graph *graph) |
| { |
| struct media_entity *entity = stack_top(graph); |
| struct media_link *link; |
| struct media_entity *next; |
| |
| link = list_entry(link_top(graph), typeof(*link), list); |
| |
| /* The link is not enabled so we do not follow. */ |
| if (!(link->flags & MEDIA_LNK_FL_ENABLED)) { |
| link_top(graph) = link_top(graph)->next; |
| return; |
| } |
| |
| /* Get the entity in the other end of the link . */ |
| next = media_entity_other(entity, link); |
| |
| /* Has the entity already been visited? */ |
| if (media_entity_enum_test_and_set(&graph->ent_enum, next)) { |
| link_top(graph) = link_top(graph)->next; |
| return; |
| } |
| |
| /* Push the new entity to stack and start over. */ |
| link_top(graph) = link_top(graph)->next; |
| stack_push(graph, next); |
| } |
| |
| struct media_entity *media_graph_walk_next(struct media_graph *graph) |
| { |
| 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) |
| media_graph_walk_iter(graph); |
| |
| return stack_pop(graph); |
| } |
| EXPORT_SYMBOL_GPL(media_graph_walk_next); |
| |
| /* ----------------------------------------------------------------------------- |
| * 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 (WARN_ON(entity->pipe && entity->pipe != pipe)) { |
| 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; |
| |
| |
| WARN_ON(!pipe->streaming_count); |
| 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); |
| |
| /* ----------------------------------------------------------------------------- |
| * Module use count |
| */ |
| |
| struct media_entity *media_entity_get(struct media_entity *entity) |
| { |
| if (entity == NULL) |
| return NULL; |
| |
| if (entity->graph_obj.mdev->dev && |
| !try_module_get(entity->graph_obj.mdev->dev->driver->owner)) |
| return NULL; |
| |
| return entity; |
| } |
| EXPORT_SYMBOL_GPL(media_entity_get); |
| |
| void media_entity_put(struct media_entity *entity) |
| { |
| if (entity == NULL) |
| return; |
| |
| if (entity->graph_obj.mdev->dev) |
| module_put(entity->graph_obj.mdev->dev->driver->owner); |
| } |
| EXPORT_SYMBOL_GPL(media_entity_put); |
| |
| /* ----------------------------------------------------------------------------- |
| * 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_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(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); |