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[media] media-device: add support for MEDIA_IOC_G_TOPOLOGY ioctl 

Add support for the new MEDIA_IOC_G_TOPOLOGY ioctl, according
with the RFC for the MC next generation.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2015-08-23 10:36:41 -03:00
parent 2521fdac28
commit 8309f47c32
1 changed files with 158 additions and 0 deletions
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158
drivers/media/media-device.c
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@ -232,6 +232,156 @@ static long media_device_setup_link(struct media_device *mdev,
return ret;
}
static long __media_device_get_topology(struct media_device *mdev,
struct media_v2_topology *topo)
{
struct media_entity *entity;
struct media_interface *intf;
struct media_pad *pad;
struct media_link *link;
struct media_v2_entity uentity;
struct media_v2_interface uintf;
struct media_v2_pad upad;
struct media_v2_link ulink;
int ret = 0, i;
topo->topology_version = mdev->topology_version;
/* Get entities and number of entities */
i = 0;
media_device_for_each_entity(entity, mdev) {
i++;
if (ret || !topo->entities)
continue;
if (i > topo->num_entities) {
ret = -ENOSPC;
continue;
}
/* Copy fields to userspace struct if not error */
memset(&uentity, 0, sizeof(uentity));
uentity.id = entity->graph_obj.id;
strncpy(uentity.name, entity->name,
sizeof(uentity.name));
if (copy_to_user(&topo->entities[i - 1], &uentity, sizeof(uentity)))
ret = -EFAULT;
}
topo->num_entities = i;
/* Get interfaces and number of interfaces */
i = 0;
media_device_for_each_intf(intf, mdev) {
i++;
if (ret || !topo->interfaces)
continue;
if (i > topo->num_interfaces) {
ret = -ENOSPC;
continue;
}
memset(&uintf, 0, sizeof(uintf));
/* Copy intf fields to userspace struct */
uintf.id = intf->graph_obj.id;
uintf.intf_type = intf->type;
uintf.flags = intf->flags;
if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
struct media_intf_devnode *devnode;
devnode = intf_to_devnode(intf);
uintf.devnode.major = devnode->major;
uintf.devnode.minor = devnode->minor;
}
if (copy_to_user(&topo->interfaces[i - 1], &uintf, sizeof(uintf)))
ret = -EFAULT;
}
topo->num_interfaces = i;
/* Get pads and number of pads */
i = 0;
media_device_for_each_pad(pad, mdev) {
i++;
if (ret || !topo->pads)
continue;
if (i > topo->num_pads) {
ret = -ENOSPC;
continue;
}
memset(&upad, 0, sizeof(upad));
/* Copy pad fields to userspace struct */
upad.id = pad->graph_obj.id;
upad.entity_id = pad->entity->graph_obj.id;
upad.flags = pad->flags;
if (copy_to_user(&topo->pads[i - 1], &upad, sizeof(upad)))
ret = -EFAULT;
}
topo->num_pads = i;
/* Get links and number of links */
i = 0;
media_device_for_each_link(link, mdev) {
i++;
if (ret || !topo->links)
continue;
if (i > topo->num_links) {
ret = -ENOSPC;
continue;
}
memset(&ulink, 0, sizeof(ulink));
/* Copy link fields to userspace struct */
ulink.id = link->graph_obj.id;
ulink.source_id = link->gobj0->id;
ulink.sink_id = link->gobj1->id;
ulink.flags = link->flags;
if (media_type(link->gobj0) != MEDIA_GRAPH_PAD)
ulink.flags |= MEDIA_LNK_FL_INTERFACE_LINK;
if (copy_to_user(&topo->links[i - 1], &ulink, sizeof(ulink)))
ret = -EFAULT;
}
topo->num_links = i;
return ret;
}
static long media_device_get_topology(struct media_device *mdev,
struct media_v2_topology __user *utopo)
{
struct media_v2_topology ktopo;
int ret;
ret = copy_from_user(&ktopo, utopo, sizeof(ktopo));
if (ret < 0)
return ret;
ret = __media_device_get_topology(mdev, &ktopo);
if (ret < 0)
return ret;
ret = copy_to_user(utopo, &ktopo, sizeof(*utopo));
return ret;
}
static long media_device_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
@ -264,6 +414,13 @@ static long media_device_ioctl(struct file *filp, unsigned int cmd,
mutex_unlock(&dev->graph_mutex);
break;
case MEDIA_IOC_G_TOPOLOGY:
mutex_lock(&dev->graph_mutex);
ret = media_device_get_topology(dev,
(struct media_v2_topology __user *)arg);
mutex_unlock(&dev->graph_mutex);
break;
default:
ret = -ENOIOCTLCMD;
}
@ -312,6 +469,7 @@ static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
case MEDIA_IOC_DEVICE_INFO:
case MEDIA_IOC_ENUM_ENTITIES:
case MEDIA_IOC_SETUP_LINK:
case MEDIA_IOC_G_TOPOLOGY:
return media_device_ioctl(filp, cmd, arg);
case MEDIA_IOC_ENUM_LINKS32: