diff options
Diffstat (limited to 'drivers/media/media-device.c')
| -rw-r--r-- | drivers/media/media-device.c | 382 |
1 files changed, 382 insertions, 0 deletions
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c new file mode 100644 index 000000000000..16b70b4412f7 --- /dev/null +++ b/drivers/media/media-device.c @@ -0,0 +1,382 @@ +/* + * Media device + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/types.h> +#include <linux/ioctl.h> +#include <linux/media.h> + +#include <media/media-device.h> +#include <media/media-devnode.h> +#include <media/media-entity.h> + +/* ----------------------------------------------------------------------------- + * Userspace API + */ + +static int media_device_open(struct file *filp) +{ + return 0; +} + +static int media_device_close(struct file *filp) +{ + return 0; +} + +static int media_device_get_info(struct media_device *dev, + struct media_device_info __user *__info) +{ + struct media_device_info info; + + memset(&info, 0, sizeof(info)); + + strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver)); + strlcpy(info.model, dev->model, sizeof(info.model)); + strlcpy(info.serial, dev->serial, sizeof(info.serial)); + strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info)); + + info.media_version = MEDIA_API_VERSION; + info.hw_revision = dev->hw_revision; + info.driver_version = dev->driver_version; + + return copy_to_user(__info, &info, sizeof(*__info)); +} + +static struct media_entity *find_entity(struct media_device *mdev, u32 id) +{ + struct media_entity *entity; + int next = id & MEDIA_ENT_ID_FLAG_NEXT; + + id &= ~MEDIA_ENT_ID_FLAG_NEXT; + + spin_lock(&mdev->lock); + + media_device_for_each_entity(entity, mdev) { + if ((entity->id == id && !next) || + (entity->id > id && next)) { + spin_unlock(&mdev->lock); + return entity; + } + } + + spin_unlock(&mdev->lock); + + return NULL; +} + +static long media_device_enum_entities(struct media_device *mdev, + struct media_entity_desc __user *uent) +{ + struct media_entity *ent; + struct media_entity_desc u_ent; + + if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id))) + return -EFAULT; + + ent = find_entity(mdev, u_ent.id); + + if (ent == NULL) + return -EINVAL; + + u_ent.id = ent->id; + u_ent.name[0] = '\0'; + if (ent->name) + strlcpy(u_ent.name, ent->name, sizeof(u_ent.name)); + u_ent.type = ent->type; + u_ent.revision = ent->revision; + u_ent.flags = ent->flags; + u_ent.group_id = ent->group_id; + u_ent.pads = ent->num_pads; + u_ent.links = ent->num_links - ent->num_backlinks; + u_ent.v4l.major = ent->v4l.major; + u_ent.v4l.minor = ent->v4l.minor; + if (copy_to_user(uent, &u_ent, sizeof(u_ent))) + return -EFAULT; + return 0; +} + +static void media_device_kpad_to_upad(const struct media_pad *kpad, + struct media_pad_desc *upad) +{ + upad->entity = kpad->entity->id; + upad->index = kpad->index; + upad->flags = kpad->flags; +} + +static long media_device_enum_links(struct media_device *mdev, + struct media_links_enum __user *ulinks) +{ + struct media_entity *entity; + struct media_links_enum links; + + if (copy_from_user(&links, ulinks, sizeof(links))) + return -EFAULT; + + entity = find_entity(mdev, links.entity); + if (entity == NULL) + return -EINVAL; + + if (links.pads) { + unsigned int p; + + for (p = 0; p < entity->num_pads; p++) { + struct media_pad_desc pad; + media_device_kpad_to_upad(&entity->pads[p], &pad); + if (copy_to_user(&links.pads[p], &pad, sizeof(pad))) + return -EFAULT; + } + } + + if (links.links) { + struct media_link_desc __user *ulink; + unsigned int l; + + for (l = 0, ulink = links.links; l < entity->num_links; l++) { + struct media_link_desc link; + + /* Ignore backlinks. */ + if (entity->links[l].source->entity != entity) + continue; + + media_device_kpad_to_upad(entity->links[l].source, + &link.source); + media_device_kpad_to_upad(entity->links[l].sink, + &link.sink); + link.flags = entity->links[l].flags; + if (copy_to_user(ulink, &link, sizeof(*ulink))) + return -EFAULT; + ulink++; + } + } + if (copy_to_user(ulinks, &links, sizeof(*ulinks))) + return -EFAULT; + 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) +{ + struct media_devnode *devnode = media_devnode_data(filp); + struct media_device *dev = to_media_device(devnode); + long ret; + + switch (cmd) { + case MEDIA_IOC_DEVICE_INFO: + ret = media_device_get_info(dev, + (struct media_device_info __user *)arg); + break; + + case MEDIA_IOC_ENUM_ENTITIES: + ret = media_device_enum_entities(dev, + (struct media_entity_desc __user *)arg); + break; + + case MEDIA_IOC_ENUM_LINKS: + mutex_lock(&dev->graph_mutex); + ret = media_device_enum_links(dev, + (struct media_links_enum __user *)arg); + 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; + } + + return ret; +} + +static const struct media_file_operations media_device_fops = { + .owner = THIS_MODULE, + .open = media_device_open, + .ioctl = media_device_ioctl, + .release = media_device_close, +}; + +/* ----------------------------------------------------------------------------- + * sysfs + */ + +static ssize_t show_model(struct device *cd, + struct device_attribute *attr, char *buf) +{ + struct media_device *mdev = to_media_device(to_media_devnode(cd)); + + return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model); +} + +static DEVICE_ATTR(model, S_IRUGO, show_model, NULL); + +/* ----------------------------------------------------------------------------- + * Registration/unregistration + */ + +static void media_device_release(struct media_devnode *mdev) +{ +} + +/** + * media_device_register - register a media device + * @mdev: The media device + * + * The caller is responsible for initializing the media device before + * registration. The following fields must be set: + * + * - dev must point to the parent device + * - model must be filled with the device model name + */ +int __must_check media_device_register(struct media_device *mdev) +{ + int ret; + + if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0)) + return -EINVAL; + + mdev->entity_id = 1; + INIT_LIST_HEAD(&mdev->entities); + spin_lock_init(&mdev->lock); + mutex_init(&mdev->graph_mutex); + + /* Register the device node. */ + mdev->devnode.fops = &media_device_fops; + mdev->devnode.parent = mdev->dev; + mdev->devnode.release = media_device_release; + ret = media_devnode_register(&mdev->devnode); + if (ret < 0) + return ret; + + ret = device_create_file(&mdev->devnode.dev, &dev_attr_model); + if (ret < 0) { + media_devnode_unregister(&mdev->devnode); + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(media_device_register); + +/** + * media_device_unregister - unregister a media device + * @mdev: The media device + * + */ +void media_device_unregister(struct media_device *mdev) +{ + struct media_entity *entity; + struct media_entity *next; + + list_for_each_entry_safe(entity, next, &mdev->entities, list) + media_device_unregister_entity(entity); + + device_remove_file(&mdev->devnode.dev, &dev_attr_model); + media_devnode_unregister(&mdev->devnode); +} +EXPORT_SYMBOL_GPL(media_device_unregister); + +/** + * media_device_register_entity - Register an entity with a media device + * @mdev: The media device + * @entity: The entity + */ +int __must_check media_device_register_entity(struct media_device *mdev, + struct media_entity *entity) +{ + /* Warn if we apparently re-register an entity */ + WARN_ON(entity->parent != NULL); + entity->parent = mdev; + + spin_lock(&mdev->lock); + if (entity->id == 0) + entity->id = mdev->entity_id++; + else + mdev->entity_id = max(entity->id + 1, mdev->entity_id); + list_add_tail(&entity->list, &mdev->entities); + spin_unlock(&mdev->lock); + + return 0; +} +EXPORT_SYMBOL_GPL(media_device_register_entity); + +/** + * media_device_unregister_entity - Unregister an entity + * @entity: The entity + * + * If the entity has never been registered this function will return + * immediately. + */ +void media_device_unregister_entity(struct media_entity *entity) +{ + struct media_device *mdev = entity->parent; + + if (mdev == NULL) + return; + + spin_lock(&mdev->lock); + list_del(&entity->list); + spin_unlock(&mdev->lock); + entity->parent = NULL; +} +EXPORT_SYMBOL_GPL(media_device_unregister_entity); |