| /* |
| * 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 <linux/export.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; |
| |
| 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 = 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; |
| 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 = 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 = {0}; |
| 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_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; |
| |
| memset(&link, 0, sizeof(link)); |
| 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); |