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-rw-r--r--kernel/drivers/media/media-device.c464
1 files changed, 464 insertions, 0 deletions
diff --git a/kernel/drivers/media/media-device.c b/kernel/drivers/media/media-device.c
new file mode 100644
index 000000000..7b3944019
--- /dev/null
+++ b/kernel/drivers/media/media-device.c
@@ -0,0 +1,464 @@
+/*
+ * 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/compat.h>
+#include <linux/export.h>
+#include <linux/ioctl.h>
+#include <linux/media.h>
+#include <linux/types.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;
+
+ 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 ((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;
+ 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 *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_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++;
+ }
+ }
+
+ 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_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;
+}
+
+#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:
+ 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)
+{
+}
+
+/**
+ * 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;
+
+ 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, 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;
+ }
+
+ 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);