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c478c7f4cb
We modified the type of media_device_request_alloc()'s second parameter from int* to void* so that it can match the interface defined in struct media_ioctl_info. [hverkuil: move #ifdef before variable to avoid compile warning] Signed-off-by: Frederic Chen <frederic.chen@mediatek.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
905 lines
23 KiB
C
905 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Media device
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*
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* Copyright (C) 2010 Nokia Corporation
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*
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* Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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* Sakari Ailus <sakari.ailus@iki.fi>
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*/
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#include <linux/compat.h>
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#include <linux/export.h>
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#include <linux/idr.h>
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#include <linux/ioctl.h>
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#include <linux/media.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/usb.h>
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#include <linux/version.h>
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#include <media/media-device.h>
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#include <media/media-devnode.h>
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#include <media/media-entity.h>
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#include <media/media-request.h>
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#ifdef CONFIG_MEDIA_CONTROLLER
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/*
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* Legacy defines from linux/media.h. This is the only place we need this
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* so we just define it here. The media.h header doesn't expose it to the
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* kernel to prevent it from being used by drivers, but here (and only here!)
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* we need it to handle the legacy behavior.
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*/
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#define MEDIA_ENT_SUBTYPE_MASK 0x0000ffff
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#define MEDIA_ENT_T_DEVNODE_UNKNOWN (MEDIA_ENT_F_OLD_BASE | \
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MEDIA_ENT_SUBTYPE_MASK)
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/* -----------------------------------------------------------------------------
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* Userspace API
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*/
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static inline void __user *media_get_uptr(__u64 arg)
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{
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return (void __user *)(uintptr_t)arg;
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}
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static int media_device_open(struct file *filp)
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{
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return 0;
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}
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static int media_device_close(struct file *filp)
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{
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return 0;
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}
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static long media_device_get_info(struct media_device *dev, void *arg)
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{
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struct media_device_info *info = arg;
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memset(info, 0, sizeof(*info));
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if (dev->driver_name[0])
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strscpy(info->driver, dev->driver_name, sizeof(info->driver));
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else
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strscpy(info->driver, dev->dev->driver->name,
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sizeof(info->driver));
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strscpy(info->model, dev->model, sizeof(info->model));
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strscpy(info->serial, dev->serial, sizeof(info->serial));
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strscpy(info->bus_info, dev->bus_info, sizeof(info->bus_info));
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info->media_version = LINUX_VERSION_CODE;
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info->driver_version = info->media_version;
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info->hw_revision = dev->hw_revision;
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return 0;
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}
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static struct media_entity *find_entity(struct media_device *mdev, u32 id)
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{
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struct media_entity *entity;
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int next = id & MEDIA_ENT_ID_FLAG_NEXT;
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id &= ~MEDIA_ENT_ID_FLAG_NEXT;
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media_device_for_each_entity(entity, mdev) {
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if (((media_entity_id(entity) == id) && !next) ||
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((media_entity_id(entity) > id) && next)) {
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return entity;
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}
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}
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return NULL;
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}
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static long media_device_enum_entities(struct media_device *mdev, void *arg)
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{
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struct media_entity_desc *entd = arg;
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struct media_entity *ent;
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ent = find_entity(mdev, entd->id);
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if (ent == NULL)
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return -EINVAL;
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memset(entd, 0, sizeof(*entd));
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entd->id = media_entity_id(ent);
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if (ent->name)
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strscpy(entd->name, ent->name, sizeof(entd->name));
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entd->type = ent->function;
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entd->revision = 0; /* Unused */
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entd->flags = ent->flags;
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entd->group_id = 0; /* Unused */
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entd->pads = ent->num_pads;
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entd->links = ent->num_links - ent->num_backlinks;
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/*
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* Workaround for a bug at media-ctl <= v1.10 that makes it to
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* do the wrong thing if the entity function doesn't belong to
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* either MEDIA_ENT_F_OLD_BASE or MEDIA_ENT_F_OLD_SUBDEV_BASE
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* Ranges.
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*
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* Non-subdevices are expected to be at the MEDIA_ENT_F_OLD_BASE,
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* or, otherwise, will be silently ignored by media-ctl when
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* printing the graphviz diagram. So, map them into the devnode
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* old range.
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*/
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if (ent->function < MEDIA_ENT_F_OLD_BASE ||
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ent->function > MEDIA_ENT_F_TUNER) {
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if (is_media_entity_v4l2_subdev(ent))
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entd->type = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
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else if (ent->function != MEDIA_ENT_F_IO_V4L)
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entd->type = MEDIA_ENT_T_DEVNODE_UNKNOWN;
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}
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memcpy(&entd->raw, &ent->info, sizeof(ent->info));
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return 0;
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}
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static void media_device_kpad_to_upad(const struct media_pad *kpad,
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struct media_pad_desc *upad)
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{
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upad->entity = media_entity_id(kpad->entity);
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upad->index = kpad->index;
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upad->flags = kpad->flags;
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}
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static long media_device_enum_links(struct media_device *mdev, void *arg)
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{
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struct media_links_enum *links = arg;
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struct media_entity *entity;
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entity = find_entity(mdev, links->entity);
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if (entity == NULL)
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return -EINVAL;
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if (links->pads) {
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unsigned int p;
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for (p = 0; p < entity->num_pads; p++) {
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struct media_pad_desc pad;
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memset(&pad, 0, sizeof(pad));
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media_device_kpad_to_upad(&entity->pads[p], &pad);
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if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
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return -EFAULT;
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}
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}
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if (links->links) {
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struct media_link *link;
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struct media_link_desc __user *ulink_desc = links->links;
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list_for_each_entry(link, &entity->links, list) {
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struct media_link_desc klink_desc;
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/* Ignore backlinks. */
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if (link->source->entity != entity)
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continue;
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memset(&klink_desc, 0, sizeof(klink_desc));
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media_device_kpad_to_upad(link->source,
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&klink_desc.source);
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media_device_kpad_to_upad(link->sink,
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&klink_desc.sink);
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klink_desc.flags = link->flags;
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if (copy_to_user(ulink_desc, &klink_desc,
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sizeof(*ulink_desc)))
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return -EFAULT;
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ulink_desc++;
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}
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}
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memset(links->reserved, 0, sizeof(links->reserved));
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return 0;
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}
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static long media_device_setup_link(struct media_device *mdev, void *arg)
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{
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struct media_link_desc *linkd = arg;
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struct media_link *link = NULL;
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struct media_entity *source;
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struct media_entity *sink;
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/* Find the source and sink entities and link.
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*/
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source = find_entity(mdev, linkd->source.entity);
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sink = find_entity(mdev, linkd->sink.entity);
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if (source == NULL || sink == NULL)
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return -EINVAL;
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if (linkd->source.index >= source->num_pads ||
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linkd->sink.index >= sink->num_pads)
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return -EINVAL;
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link = media_entity_find_link(&source->pads[linkd->source.index],
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&sink->pads[linkd->sink.index]);
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if (link == NULL)
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return -EINVAL;
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memset(linkd->reserved, 0, sizeof(linkd->reserved));
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/* Setup the link on both entities. */
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return __media_entity_setup_link(link, linkd->flags);
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}
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static long media_device_get_topology(struct media_device *mdev, void *arg)
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{
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struct media_v2_topology *topo = arg;
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struct media_entity *entity;
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struct media_interface *intf;
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struct media_pad *pad;
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struct media_link *link;
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struct media_v2_entity kentity, __user *uentity;
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struct media_v2_interface kintf, __user *uintf;
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struct media_v2_pad kpad, __user *upad;
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struct media_v2_link klink, __user *ulink;
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unsigned int i;
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int ret = 0;
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topo->topology_version = mdev->topology_version;
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/* Get entities and number of entities */
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i = 0;
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uentity = media_get_uptr(topo->ptr_entities);
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media_device_for_each_entity(entity, mdev) {
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i++;
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if (ret || !uentity)
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continue;
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if (i > topo->num_entities) {
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ret = -ENOSPC;
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continue;
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}
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/* Copy fields to userspace struct if not error */
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memset(&kentity, 0, sizeof(kentity));
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kentity.id = entity->graph_obj.id;
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kentity.function = entity->function;
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kentity.flags = entity->flags;
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strscpy(kentity.name, entity->name,
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sizeof(kentity.name));
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if (copy_to_user(uentity, &kentity, sizeof(kentity)))
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ret = -EFAULT;
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uentity++;
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}
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topo->num_entities = i;
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topo->reserved1 = 0;
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/* Get interfaces and number of interfaces */
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i = 0;
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uintf = media_get_uptr(topo->ptr_interfaces);
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media_device_for_each_intf(intf, mdev) {
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i++;
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if (ret || !uintf)
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continue;
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if (i > topo->num_interfaces) {
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ret = -ENOSPC;
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continue;
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}
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memset(&kintf, 0, sizeof(kintf));
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/* Copy intf fields to userspace struct */
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kintf.id = intf->graph_obj.id;
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kintf.intf_type = intf->type;
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kintf.flags = intf->flags;
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if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
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struct media_intf_devnode *devnode;
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devnode = intf_to_devnode(intf);
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kintf.devnode.major = devnode->major;
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kintf.devnode.minor = devnode->minor;
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}
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if (copy_to_user(uintf, &kintf, sizeof(kintf)))
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ret = -EFAULT;
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uintf++;
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}
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topo->num_interfaces = i;
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topo->reserved2 = 0;
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/* Get pads and number of pads */
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i = 0;
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upad = media_get_uptr(topo->ptr_pads);
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media_device_for_each_pad(pad, mdev) {
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i++;
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if (ret || !upad)
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continue;
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if (i > topo->num_pads) {
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ret = -ENOSPC;
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continue;
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}
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memset(&kpad, 0, sizeof(kpad));
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/* Copy pad fields to userspace struct */
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kpad.id = pad->graph_obj.id;
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kpad.entity_id = pad->entity->graph_obj.id;
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kpad.flags = pad->flags;
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kpad.index = pad->index;
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if (copy_to_user(upad, &kpad, sizeof(kpad)))
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ret = -EFAULT;
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upad++;
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}
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topo->num_pads = i;
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topo->reserved3 = 0;
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/* Get links and number of links */
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i = 0;
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ulink = media_get_uptr(topo->ptr_links);
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media_device_for_each_link(link, mdev) {
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if (link->is_backlink)
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continue;
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i++;
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if (ret || !ulink)
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continue;
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if (i > topo->num_links) {
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ret = -ENOSPC;
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continue;
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}
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memset(&klink, 0, sizeof(klink));
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/* Copy link fields to userspace struct */
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klink.id = link->graph_obj.id;
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klink.source_id = link->gobj0->id;
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klink.sink_id = link->gobj1->id;
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klink.flags = link->flags;
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if (copy_to_user(ulink, &klink, sizeof(klink)))
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ret = -EFAULT;
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ulink++;
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}
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topo->num_links = i;
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topo->reserved4 = 0;
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return ret;
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}
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static long media_device_request_alloc(struct media_device *mdev, void *arg)
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{
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#ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
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int *alloc_fd = arg;
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if (!mdev->ops || !mdev->ops->req_validate || !mdev->ops->req_queue)
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return -ENOTTY;
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return media_request_alloc(mdev, alloc_fd);
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#else
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return -ENOTTY;
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#endif
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}
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static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd)
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{
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if ((_IOC_DIR(cmd) & _IOC_WRITE) &&
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copy_from_user(karg, uarg, _IOC_SIZE(cmd)))
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return -EFAULT;
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return 0;
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}
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static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
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{
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if ((_IOC_DIR(cmd) & _IOC_READ) &&
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copy_to_user(uarg, karg, _IOC_SIZE(cmd)))
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return -EFAULT;
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return 0;
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}
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/* Do acquire the graph mutex */
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#define MEDIA_IOC_FL_GRAPH_MUTEX BIT(0)
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#define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user) \
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[_IOC_NR(MEDIA_IOC_##__cmd)] = { \
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.cmd = MEDIA_IOC_##__cmd, \
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.fn = func, \
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.flags = fl, \
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.arg_from_user = from_user, \
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.arg_to_user = to_user, \
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}
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#define MEDIA_IOC(__cmd, func, fl) \
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MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)
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/* the table is indexed by _IOC_NR(cmd) */
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struct media_ioctl_info {
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unsigned int cmd;
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unsigned short flags;
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long (*fn)(struct media_device *dev, void *arg);
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long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);
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long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);
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};
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static const struct media_ioctl_info ioctl_info[] = {
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MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),
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MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),
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MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),
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MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),
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MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
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MEDIA_IOC(REQUEST_ALLOC, media_device_request_alloc, 0),
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};
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static long media_device_ioctl(struct file *filp, unsigned int cmd,
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unsigned long __arg)
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{
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struct media_devnode *devnode = media_devnode_data(filp);
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struct media_device *dev = devnode->media_dev;
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const struct media_ioctl_info *info;
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void __user *arg = (void __user *)__arg;
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char __karg[256], *karg = __karg;
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long ret;
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if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)
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|| ioctl_info[_IOC_NR(cmd)].cmd != cmd)
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return -ENOIOCTLCMD;
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info = &ioctl_info[_IOC_NR(cmd)];
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if (_IOC_SIZE(info->cmd) > sizeof(__karg)) {
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karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL);
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if (!karg)
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return -ENOMEM;
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}
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if (info->arg_from_user) {
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ret = info->arg_from_user(karg, arg, cmd);
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if (ret)
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goto out_free;
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}
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if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
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mutex_lock(&dev->graph_mutex);
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ret = info->fn(dev, karg);
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if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
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mutex_unlock(&dev->graph_mutex);
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if (!ret && info->arg_to_user)
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ret = info->arg_to_user(arg, karg, cmd);
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out_free:
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if (karg != __karg)
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kfree(karg);
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return ret;
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}
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#ifdef CONFIG_COMPAT
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struct media_links_enum32 {
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__u32 entity;
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compat_uptr_t pads; /* struct media_pad_desc * */
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compat_uptr_t links; /* struct media_link_desc * */
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__u32 reserved[4];
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};
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static long media_device_enum_links32(struct media_device *mdev,
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struct media_links_enum32 __user *ulinks)
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|
{
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struct media_links_enum links;
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compat_uptr_t pads_ptr, links_ptr;
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int ret;
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memset(&links, 0, sizeof(links));
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|
|
|
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);
|
|
|
|
ret = media_device_enum_links(mdev, &links);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (copy_to_user(ulinks->reserved, links.reserved,
|
|
sizeof(ulinks->reserved)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
#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 = devnode->media_dev;
|
|
long ret;
|
|
|
|
switch (cmd) {
|
|
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:
|
|
return media_device_ioctl(filp, cmd, arg);
|
|
}
|
|
|
|
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_devnode *devnode = to_media_devnode(cd);
|
|
struct media_device *mdev = devnode->media_dev;
|
|
|
|
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 *devnode)
|
|
{
|
|
dev_dbg(devnode->parent, "Media device released\n");
|
|
}
|
|
|
|
static void __media_device_unregister_entity(struct media_entity *entity)
|
|
{
|
|
struct media_device *mdev = entity->graph_obj.mdev;
|
|
struct media_link *link, *tmp;
|
|
struct media_interface *intf;
|
|
unsigned int i;
|
|
|
|
ida_free(&mdev->entity_internal_idx, entity->internal_idx);
|
|
|
|
/* 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_destroy(&entity->pads[i].graph_obj);
|
|
|
|
/* Remove the entity */
|
|
media_gobj_destroy(&entity->graph_obj);
|
|
|
|
/* invoke entity_notify callbacks to handle entity removal?? */
|
|
|
|
entity->graph_obj.mdev = NULL;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct media_entity_notify *notify, *next;
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||
|
|
entity->function == MEDIA_ENT_F_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);
|
|
entity->num_links = 0;
|
|
entity->num_backlinks = 0;
|
|
|
|
ret = ida_alloc_min(&mdev->entity_internal_idx, 1, GFP_KERNEL);
|
|
if (ret < 0)
|
|
return ret;
|
|
entity->internal_idx = ret;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
mdev->entity_internal_idx_max =
|
|
max(mdev->entity_internal_idx_max, entity->internal_idx);
|
|
|
|
/* Initialize media_gobj embedded at the entity */
|
|
media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
|
|
|
|
/* Initialize objects at the pads */
|
|
for (i = 0; i < entity->num_pads; i++)
|
|
media_gobj_create(mdev, MEDIA_GRAPH_PAD,
|
|
&entity->pads[i].graph_obj);
|
|
|
|
/* invoke entity_notify callbacks */
|
|
list_for_each_entry_safe(notify, next, &mdev->entity_notify, list)
|
|
notify->notify(entity, notify->notify_data);
|
|
|
|
if (mdev->entity_internal_idx_max
|
|
>= mdev->pm_count_walk.ent_enum.idx_max) {
|
|
struct media_graph new = { .top = 0 };
|
|
|
|
/*
|
|
* Initialise the new graph walk before cleaning up
|
|
* the old one in order not to spoil the graph walk
|
|
* object of the media device if graph walk init fails.
|
|
*/
|
|
ret = media_graph_walk_init(&new, mdev);
|
|
if (ret) {
|
|
__media_device_unregister_entity(entity);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
return ret;
|
|
}
|
|
media_graph_walk_cleanup(&mdev->pm_count_walk);
|
|
mdev->pm_count_walk = new;
|
|
}
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_device_register_entity);
|
|
|
|
void media_device_unregister_entity(struct media_entity *entity)
|
|
{
|
|
struct media_device *mdev = entity->graph_obj.mdev;
|
|
|
|
if (mdev == NULL)
|
|
return;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
__media_device_unregister_entity(entity);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_device_unregister_entity);
|
|
|
|
/**
|
|
* media_device_init() - initialize 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
|
|
*/
|
|
void media_device_init(struct media_device *mdev)
|
|
{
|
|
INIT_LIST_HEAD(&mdev->entities);
|
|
INIT_LIST_HEAD(&mdev->interfaces);
|
|
INIT_LIST_HEAD(&mdev->pads);
|
|
INIT_LIST_HEAD(&mdev->links);
|
|
INIT_LIST_HEAD(&mdev->entity_notify);
|
|
|
|
mutex_init(&mdev->req_queue_mutex);
|
|
mutex_init(&mdev->graph_mutex);
|
|
ida_init(&mdev->entity_internal_idx);
|
|
|
|
atomic_set(&mdev->request_id, 0);
|
|
|
|
dev_dbg(mdev->dev, "Media device initialized\n");
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_device_init);
|
|
|
|
void media_device_cleanup(struct media_device *mdev)
|
|
{
|
|
ida_destroy(&mdev->entity_internal_idx);
|
|
mdev->entity_internal_idx_max = 0;
|
|
media_graph_walk_cleanup(&mdev->pm_count_walk);
|
|
mutex_destroy(&mdev->graph_mutex);
|
|
mutex_destroy(&mdev->req_queue_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_device_cleanup);
|
|
|
|
int __must_check __media_device_register(struct media_device *mdev,
|
|
struct module *owner)
|
|
{
|
|
struct media_devnode *devnode;
|
|
int ret;
|
|
|
|
devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
|
|
if (!devnode)
|
|
return -ENOMEM;
|
|
|
|
/* Register the device node. */
|
|
mdev->devnode = devnode;
|
|
devnode->fops = &media_device_fops;
|
|
devnode->parent = mdev->dev;
|
|
devnode->release = media_device_release;
|
|
|
|
/* Set version 0 to indicate user-space that the graph is static */
|
|
mdev->topology_version = 0;
|
|
|
|
ret = media_devnode_register(mdev, devnode, owner);
|
|
if (ret < 0) {
|
|
/* devnode free is handled in media_devnode_*() */
|
|
mdev->devnode = NULL;
|
|
return ret;
|
|
}
|
|
|
|
ret = device_create_file(&devnode->dev, &dev_attr_model);
|
|
if (ret < 0) {
|
|
/* devnode free is handled in media_devnode_*() */
|
|
mdev->devnode = NULL;
|
|
media_devnode_unregister_prepare(devnode);
|
|
media_devnode_unregister(devnode);
|
|
return ret;
|
|
}
|
|
|
|
dev_dbg(mdev->dev, "Media device registered\n");
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_device_register);
|
|
|
|
int __must_check media_device_register_entity_notify(struct media_device *mdev,
|
|
struct media_entity_notify *nptr)
|
|
{
|
|
mutex_lock(&mdev->graph_mutex);
|
|
list_add_tail(&nptr->list, &mdev->entity_notify);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
|
|
|
|
/*
|
|
* Note: Should be called with mdev->lock held.
|
|
*/
|
|
static void __media_device_unregister_entity_notify(struct media_device *mdev,
|
|
struct media_entity_notify *nptr)
|
|
{
|
|
list_del(&nptr->list);
|
|
}
|
|
|
|
void media_device_unregister_entity_notify(struct media_device *mdev,
|
|
struct media_entity_notify *nptr)
|
|
{
|
|
mutex_lock(&mdev->graph_mutex);
|
|
__media_device_unregister_entity_notify(mdev, nptr);
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);
|
|
|
|
void media_device_unregister(struct media_device *mdev)
|
|
{
|
|
struct media_entity *entity;
|
|
struct media_entity *next;
|
|
struct media_interface *intf, *tmp_intf;
|
|
struct media_entity_notify *notify, *nextp;
|
|
|
|
if (mdev == NULL)
|
|
return;
|
|
|
|
mutex_lock(&mdev->graph_mutex);
|
|
|
|
/* Check if mdev was ever registered at all */
|
|
if (!media_devnode_is_registered(mdev->devnode)) {
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
return;
|
|
}
|
|
|
|
/* Clear the devnode register bit to avoid races with media dev open */
|
|
media_devnode_unregister_prepare(mdev->devnode);
|
|
|
|
/* 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 entity_notify callbacks from the media device */
|
|
list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list)
|
|
__media_device_unregister_entity_notify(mdev, notify);
|
|
|
|
/* Remove all interfaces from the media device */
|
|
list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
|
|
graph_obj.list) {
|
|
/*
|
|
* Unlink the interface, but don't free it here; the
|
|
* module which created it is responsible for freeing
|
|
* it
|
|
*/
|
|
__media_remove_intf_links(intf);
|
|
media_gobj_destroy(&intf->graph_obj);
|
|
}
|
|
|
|
mutex_unlock(&mdev->graph_mutex);
|
|
|
|
dev_dbg(mdev->dev, "Media device unregistered\n");
|
|
|
|
device_remove_file(&mdev->devnode->dev, &dev_attr_model);
|
|
media_devnode_unregister(mdev->devnode);
|
|
/* devnode free is handled in media_devnode_*() */
|
|
mdev->devnode = NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_device_unregister);
|
|
|
|
#if IS_ENABLED(CONFIG_PCI)
|
|
void media_device_pci_init(struct media_device *mdev,
|
|
struct pci_dev *pci_dev,
|
|
const char *name)
|
|
{
|
|
mdev->dev = &pci_dev->dev;
|
|
|
|
if (name)
|
|
strscpy(mdev->model, name, sizeof(mdev->model));
|
|
else
|
|
strscpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model));
|
|
|
|
sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev));
|
|
|
|
mdev->hw_revision = (pci_dev->subsystem_vendor << 16)
|
|
| pci_dev->subsystem_device;
|
|
|
|
media_device_init(mdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(media_device_pci_init);
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_USB)
|
|
void __media_device_usb_init(struct media_device *mdev,
|
|
struct usb_device *udev,
|
|
const char *board_name,
|
|
const char *driver_name)
|
|
{
|
|
mdev->dev = &udev->dev;
|
|
|
|
if (driver_name)
|
|
strscpy(mdev->driver_name, driver_name,
|
|
sizeof(mdev->driver_name));
|
|
|
|
if (board_name)
|
|
strscpy(mdev->model, board_name, sizeof(mdev->model));
|
|
else if (udev->product)
|
|
strscpy(mdev->model, udev->product, sizeof(mdev->model));
|
|
else
|
|
strscpy(mdev->model, "unknown model", sizeof(mdev->model));
|
|
if (udev->serial)
|
|
strscpy(mdev->serial, udev->serial, sizeof(mdev->serial));
|
|
usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info));
|
|
mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
|
|
|
|
media_device_init(mdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__media_device_usb_init);
|
|
#endif
|
|
|
|
|
|
#endif /* CONFIG_MEDIA_CONTROLLER */
|