/* * Media device * * Copyright (C) 2010 Nokia Corporation * * Contacts: Laurent Pinchart * Sakari Ailus * * 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 #include #include #include #include #include #include #include #include #ifdef CONFIG_MEDIA_CONTROLLER /* ----------------------------------------------------------------------------- * 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; if (copy_to_user(__info, &info, sizeof(*__info))) return -EFAULT; return 0; } 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 (((media_entity_id(entity) == id) && !next) || ((media_entity_id(entity) > 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; memset(&u_ent, 0, sizeof(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 = media_entity_id(ent); if (ent->name) strlcpy(u_ent.name, ent->name, sizeof(u_ent.name)); u_ent.type = ent->function; 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; memcpy(&u_ent.raw, &ent->info, sizeof(ent->info)); 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 = media_entity_id(kpad->entity); upad->index = kpad->index; upad->flags = kpad->flags; } static long __media_device_enum_links(struct media_device *mdev, struct media_links_enum *links) { struct media_entity *entity; 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; memset(&pad, 0, sizeof(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 *ent_link; struct media_link_desc __user *ulink = links->links; list_for_each_entry(ent_link, &entity->links, list) { struct media_link_desc link; /* Ignore backlinks. */ if (ent_link->source->entity != entity) continue; memset(&link, 0, sizeof(link)); media_device_kpad_to_upad(ent_link->source, &link.source); media_device_kpad_to_upad(ent_link->sink, &link.sink); link.flags = ent_link->flags; if (copy_to_user(ulink, &link, sizeof(*ulink))) return -EFAULT; ulink++; } } return 0; } static long media_device_enum_links(struct media_device *mdev, struct media_links_enum __user *ulinks) { struct media_links_enum links; int rval; if (copy_from_user(&links, ulinks, sizeof(links))) return -EFAULT; rval = __media_device_enum_links(mdev, &links); if (rval < 0) return rval; 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_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) { if (link->is_backlink) continue; 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) { 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; 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; } return ret; } #ifdef CONFIG_COMPAT struct media_links_enum32 { __u32 entity; compat_uptr_t pads; /* struct media_pad_desc * */ compat_uptr_t links; /* struct media_link_desc * */ __u32 reserved[4]; }; static long media_device_enum_links32(struct media_device *mdev, struct media_links_enum32 __user *ulinks) { struct media_links_enum links; compat_uptr_t pads_ptr, links_ptr; memset(&links, 0, sizeof(links)); if (get_user(links.entity, &ulinks->entity) || get_user(pads_ptr, &ulinks->pads) || get_user(links_ptr, &ulinks->links)) return -EFAULT; links.pads = compat_ptr(pads_ptr); links.links = compat_ptr(links_ptr); return __media_device_enum_links(mdev, &links); } #define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32) static long media_device_compat_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: 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: mutex_lock(&dev->graph_mutex); ret = media_device_enum_links32(dev, (struct media_links_enum32 __user *)arg); mutex_unlock(&dev->graph_mutex); break; default: ret = -ENOIOCTLCMD; } return ret; } #endif /* CONFIG_COMPAT */ static const struct media_file_operations media_device_fops = { .owner = THIS_MODULE, .open = media_device_open, .ioctl = media_device_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = media_device_compat_ioctl, #endif /* CONFIG_COMPAT */ .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) { dev_dbg(mdev->parent, "Media device released\n"); } /** * 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, struct module *owner) { int ret; if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0)) return -EINVAL; INIT_LIST_HEAD(&mdev->entities); INIT_LIST_HEAD(&mdev->interfaces); INIT_LIST_HEAD(&mdev->pads); INIT_LIST_HEAD(&mdev->links); 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, owner); 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; } dev_dbg(mdev->dev, "Media device registered\n"); 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; struct media_interface *intf, *tmp_intf; /* Remove all entities from the media device */ list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list) media_device_unregister_entity(entity); /* Remove all interfaces from the media device */ spin_lock(&mdev->lock); list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces, graph_obj.list) { __media_remove_intf_links(intf); media_gobj_remove(&intf->graph_obj); kfree(intf); } spin_unlock(&mdev->lock); device_remove_file(&mdev->devnode.dev, &dev_attr_model); media_devnode_unregister(&mdev->devnode); dev_dbg(mdev->dev, "Media device unregistered\n"); } 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) { int i; if (entity->function == MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN || entity->function == MEDIA_ENT_T_UNKNOWN) dev_warn(mdev->dev, "Entity type for entity %s was not initialized!\n", entity->name); /* Warn if we apparently re-register an entity */ WARN_ON(entity->graph_obj.mdev != NULL); entity->graph_obj.mdev = mdev; INIT_LIST_HEAD(&entity->links); spin_lock(&mdev->lock); /* Initialize media_gobj embedded at the entity */ media_gobj_init(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj); /* Initialize objects at the pads */ for (i = 0; i < entity->num_pads; i++) media_gobj_init(mdev, MEDIA_GRAPH_PAD, &entity->pads[i].graph_obj); 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) { int i; struct media_device *mdev = entity->graph_obj.mdev; struct media_link *link, *tmp; struct media_interface *intf; if (mdev == NULL) return; spin_lock(&mdev->lock); /* Remove all interface links pointing to this entity */ list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) { list_for_each_entry_safe(link, tmp, &intf->links, list) { if (link->entity == entity) __media_remove_intf_link(link); } } /* Remove all data links that belong to this entity */ __media_entity_remove_links(entity); /* Remove all pads that belong to this entity */ for (i = 0; i < entity->num_pads; i++) media_gobj_remove(&entity->pads[i].graph_obj); /* Remove the entity */ media_gobj_remove(&entity->graph_obj); spin_unlock(&mdev->lock); entity->graph_obj.mdev = NULL; } EXPORT_SYMBOL_GPL(media_device_unregister_entity); static void media_device_release_devres(struct device *dev, void *res) { } /* * media_device_get_devres() - get media device as device resource * creates if one doesn't exist */ struct media_device *media_device_get_devres(struct device *dev) { struct media_device *mdev; mdev = devres_find(dev, media_device_release_devres, NULL, NULL); if (mdev) return mdev; mdev = devres_alloc(media_device_release_devres, sizeof(struct media_device), GFP_KERNEL); if (!mdev) return NULL; return devres_get(dev, mdev, NULL, NULL); } EXPORT_SYMBOL_GPL(media_device_get_devres); /* * media_device_find_devres() - find media device as device resource */ struct media_device *media_device_find_devres(struct device *dev) { return devres_find(dev, media_device_release_devres, NULL, NULL); } EXPORT_SYMBOL_GPL(media_device_find_devres); #endif /* CONFIG_MEDIA_CONTROLLER */