diff options
author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2009-12-09 08:40:03 -0300 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-03-22 04:53:16 -0300 |
commit | 97548ed4c4661502cdfd1aabd5d3876fa4f5cc2e (patch) | |
tree | c85b85954f53e3a97b6590de8d5d5396e7c43358 /drivers/media/media-device.c | |
parent | 1651333b09743887bc2dd3d158a11853a2be3fe7 (diff) | |
download | op-kernel-dev-97548ed4c4661502cdfd1aabd5d3876fa4f5cc2e.zip op-kernel-dev-97548ed4c4661502cdfd1aabd5d3876fa4f5cc2e.tar.gz |
[media] media: Links setup
Create the following ioctl and implement it at the media device level to
setup links.
- MEDIA_IOC_SETUP_LINK: Modify the properties of a given link
The only property that can currently be modified is the ENABLED link
flag to enable/disable a link. Links marked with the IMMUTABLE link flag
can not be enabled or disabled.
Enabling or disabling a link has effects on entities' use count. Those
changes are automatically propagated through the graph.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/media-device.c')
-rw-r--r-- | drivers/media/media-device.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c index 648a9d8..16b70b4 100644 --- a/drivers/media/media-device.c +++ b/drivers/media/media-device.c @@ -172,6 +172,44 @@ static long media_device_enum_links(struct media_device *mdev, return 0; } +static long media_device_setup_link(struct media_device *mdev, + struct media_link_desc __user *_ulink) +{ + struct media_link *link = NULL; + struct media_link_desc ulink; + struct media_entity *source; + struct media_entity *sink; + int ret; + + if (copy_from_user(&ulink, _ulink, sizeof(ulink))) + return -EFAULT; + + /* Find the source and sink entities and link. + */ + source = find_entity(mdev, ulink.source.entity); + sink = find_entity(mdev, ulink.sink.entity); + + if (source == NULL || sink == NULL) + return -EINVAL; + + if (ulink.source.index >= source->num_pads || + ulink.sink.index >= sink->num_pads) + return -EINVAL; + + link = media_entity_find_link(&source->pads[ulink.source.index], + &sink->pads[ulink.sink.index]); + if (link == NULL) + return -EINVAL; + + /* Setup the link on both entities. */ + ret = __media_entity_setup_link(link, ulink.flags); + + if (copy_to_user(_ulink, &ulink, sizeof(ulink))) + return -EFAULT; + + return ret; +} + static long media_device_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { @@ -197,6 +235,13 @@ static long media_device_ioctl(struct file *filp, unsigned int cmd, mutex_unlock(&dev->graph_mutex); break; + case MEDIA_IOC_SETUP_LINK: + mutex_lock(&dev->graph_mutex); + ret = media_device_setup_link(dev, + (struct media_link_desc __user *)arg); + mutex_unlock(&dev->graph_mutex); + break; + default: ret = -ENOIOCTLCMD; } |