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drivers/media/media-device.c
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/* * 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> |
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#include <linux/media.h> |
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#include <linux/export.h> |
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#include <media/media-device.h> #include <media/media-devnode.h> |
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#include <media/media-entity.h> |
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/* ----------------------------------------------------------------------------- * 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)); } |
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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; |
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memcpy(&u_ent.raw, &ent->info, sizeof(ent->info)); |
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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; } |
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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; } |
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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; |
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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; |
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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; |
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default: ret = -ENOIOCTLCMD; } return ret; } |
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static const struct media_file_operations media_device_fops = { .owner = THIS_MODULE, |
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.open = media_device_open, .ioctl = media_device_ioctl, .release = media_device_close, |
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}; /* ----------------------------------------------------------------------------- * 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 ", (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; |
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mdev->entity_id = 1; INIT_LIST_HEAD(&mdev->entities); spin_lock_init(&mdev->lock); |
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mutex_init(&mdev->graph_mutex); |
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/* 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) { |
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struct media_entity *entity; struct media_entity *next; list_for_each_entry_safe(entity, next, &mdev->entities, list) media_device_unregister_entity(entity); |
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device_remove_file(&mdev->devnode.dev, &dev_attr_model); media_devnode_unregister(&mdev->devnode); } EXPORT_SYMBOL_GPL(media_device_unregister); |
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/** * 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); |