Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Media device
 *
 * Copyright (C) 2010 Nokia Corporation
 *
 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *	     Sakari Ailus <sakari.ailus@iki.fi>
 */
 
#include <linux/compat.h>
#include <linux/export.h>
#include <linux/idr.h>
#include <linux/ioctl.h>
#include <linux/media.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/usb.h>
#include <linux/version.h>
#include <trace/hooks/v4l2mc.h>
 
#include <media/media-device.h>
#include <media/media-devnode.h>
#include <media/media-entity.h>
#include <media/media-request.h>
 
#ifdef CONFIG_MEDIA_CONTROLLER
 
/*
 * Legacy defines from linux/media.h. This is the only place we need this
 * so we just define it here. The media.h header doesn't expose it to the
 * kernel to prevent it from being used by drivers, but here (and only here!)
 * we need it to handle the legacy behavior.
 */
#define MEDIA_ENT_SUBTYPE_MASK			0x0000ffff
#define MEDIA_ENT_T_DEVNODE_UNKNOWN		(MEDIA_ENT_F_OLD_BASE | \
<------><------><------><------><------><------> MEDIA_ENT_SUBTYPE_MASK)
 
/* -----------------------------------------------------------------------------
 * Userspace API
 */
 
static inline void __user *media_get_uptr(__u64 arg)
{
<------>return (void __user *)(uintptr_t)arg;
}
 
static int media_device_open(struct file *filp)
{
<------>return 0;
}
 
static int media_device_close(struct file *filp)
{
<------>return 0;
}
 
static long media_device_get_info(struct media_device *dev, void *arg)
{
<------>struct media_device_info *info = arg;
 
<------>memset(info, 0, sizeof(*info));
 
<------>if (dev->driver_name[0])
<------><------>strscpy(info->driver, dev->driver_name, sizeof(info->driver));
<------>else
<------><------>strscpy(info->driver, dev->dev->driver->name,
<------><------><------>sizeof(info->driver));
 
<------>strscpy(info->model, dev->model, sizeof(info->model));
<------>strscpy(info->serial, dev->serial, sizeof(info->serial));
<------>strscpy(info->bus_info, dev->bus_info, sizeof(info->bus_info));
 
<------>info->media_version = LINUX_VERSION_CODE;
<------>info->driver_version = info->media_version;
<------>info->hw_revision = dev->hw_revision;
 
<------>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;
 
<------>media_device_for_each_entity(entity, mdev) {
<------><------>if (((media_entity_id(entity) == id) && !next) ||
<------><------>    ((media_entity_id(entity) > id) && next)) {
<------><------><------>return entity;
<------><------>}
<------>}
 
<------>return NULL;
}
 
static long media_device_enum_entities(struct media_device *mdev, void *arg)
{
<------>struct media_entity_desc *entd = arg;
<------>struct media_entity *ent;
 
<------>ent = find_entity(mdev, entd->id);
<------>if (ent == NULL)
<------><------>return -EINVAL;
 
<------>memset(entd, 0, sizeof(*entd));
 
<------>entd->id = media_entity_id(ent);
<------>if (ent->name)
<------><------>strscpy(entd->name, ent->name, sizeof(entd->name));
<------>entd->type = ent->function;
<------>entd->revision = 0;		/* Unused */
<------>entd->flags = ent->flags;
<------>entd->group_id = 0;		/* Unused */
<------>entd->pads = ent->num_pads;
<------>entd->links = ent->num_links - ent->num_backlinks;
 
<------>/*
<------> * Workaround for a bug at media-ctl <= v1.10 that makes it to
<------> * do the wrong thing if the entity function doesn't belong to
<------> * either MEDIA_ENT_F_OLD_BASE or MEDIA_ENT_F_OLD_SUBDEV_BASE
<------> * Ranges.
<------> *
<------> * Non-subdevices are expected to be at the MEDIA_ENT_F_OLD_BASE,
<------> * or, otherwise, will be silently ignored by media-ctl when
<------> * printing the graphviz diagram. So, map them into the devnode
<------> * old range.
<------> */
<------>if (ent->function < MEDIA_ENT_F_OLD_BASE ||
<------>    ent->function > MEDIA_ENT_F_TUNER) {
<------><------>if (is_media_entity_v4l2_subdev(ent))
<------><------><------>entd->type = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
<------><------>else if (ent->function != MEDIA_ENT_F_IO_V4L)
<------><------><------>entd->type = MEDIA_ENT_T_DEVNODE_UNKNOWN;
<------>}
 
<------>memcpy(&entd->raw, &ent->info, sizeof(ent->info));
 
<------>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, void *arg)
{
<------>struct media_links_enum *links = arg;
<------>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 *link;
<------><------>struct media_link_desc __user *ulink_desc = links->links;
 
<------><------>list_for_each_entry(link, &entity->links, list) {
<------><------><------>struct media_link_desc klink_desc;
 
<------><------><------>/* Ignore backlinks. */
<------><------><------>if (link->source->entity != entity)
<------><------><------><------>continue;
<------><------><------>memset(&klink_desc, 0, sizeof(klink_desc));
<------><------><------>media_device_kpad_to_upad(link->source,
<------><------><------><------><------><------>  &klink_desc.source);
<------><------><------>media_device_kpad_to_upad(link->sink,
<------><------><------><------><------><------>  &klink_desc.sink);
<------><------><------>klink_desc.flags = link->flags;
<------><------><------>if (copy_to_user(ulink_desc, &klink_desc,
<------><------><------><------><------> sizeof(*ulink_desc)))
<------><------><------><------>return -EFAULT;
<------><------><------>ulink_desc++;
<------><------>}
<------>}
<------>memset(links->reserved, 0, sizeof(links->reserved));
 
<------>return 0;
}
 
static long media_device_setup_link(struct media_device *mdev, void *arg)
{
<------>struct media_link_desc *linkd = arg;
<------>struct media_link *link = NULL;
<------>struct media_entity *source;
<------>struct media_entity *sink;
<------>int ret = 0;
 
<------>/* Find the source and sink entities and link.
<------> */
<------>source = find_entity(mdev, linkd->source.entity);
<------>sink = find_entity(mdev, linkd->sink.entity);
 
<------>if (source == NULL || sink == NULL)
<------><------>return -EINVAL;
 
<------>if (linkd->source.index >= source->num_pads ||
<------>    linkd->sink.index >= sink->num_pads)
<------><------>return -EINVAL;
 
<------>link = media_entity_find_link(&source->pads[linkd->source.index],
<------><------><------><------>      &sink->pads[linkd->sink.index]);
<------>if (link == NULL)
<------><------>return -EINVAL;
 
<------>/* Setup the link on both entities */
<------>trace_android_vh_media_device_setup_link(link, linkd, &ret);
<------>trace_android_rvh_media_device_setup_link(link, linkd, &ret);
<------>if (ret)
<------><------>return ret;
 
<------>memset(linkd->reserved, 0, sizeof(linkd->reserved));
<------>return __media_entity_setup_link(link, linkd->flags);
}
 
static long media_device_get_topology(struct media_device *mdev, void *arg)
{
<------>struct media_v2_topology *topo = arg;
<------>struct media_entity *entity;
<------>struct media_interface *intf;
<------>struct media_pad *pad;
<------>struct media_link *link;
<------>struct media_v2_entity kentity, __user *uentity;
<------>struct media_v2_interface kintf, __user *uintf;
<------>struct media_v2_pad kpad, __user *upad;
<------>struct media_v2_link klink, __user *ulink;
<------>unsigned int i;
<------>int ret = 0;
 
<------>topo->topology_version = mdev->topology_version;
 
<------>/* Get entities and number of entities */
<------>i = 0;
<------>uentity = media_get_uptr(topo->ptr_entities);
<------>media_device_for_each_entity(entity, mdev) {
<------><------>i++;
<------><------>if (ret || !uentity)
<------><------><------>continue;
 
<------><------>if (i > topo->num_entities) {
<------><------><------>ret = -ENOSPC;
<------><------><------>continue;
<------><------>}
 
<------><------>/* Copy fields to userspace struct if not error */
<------><------>memset(&kentity, 0, sizeof(kentity));
<------><------>kentity.id = entity->graph_obj.id;
<------><------>kentity.function = entity->function;
<------><------>kentity.flags = entity->flags;
<------><------>strscpy(kentity.name, entity->name,
<------><------><------>sizeof(kentity.name));
 
<------><------>if (copy_to_user(uentity, &kentity, sizeof(kentity)))
<------><------><------>ret = -EFAULT;
<------><------>uentity++;
<------>}
<------>topo->num_entities = i;
<------>topo->reserved1 = 0;
 
<------>/* Get interfaces and number of interfaces */
<------>i = 0;
<------>uintf = media_get_uptr(topo->ptr_interfaces);
<------>media_device_for_each_intf(intf, mdev) {
<------><------>i++;
<------><------>if (ret || !uintf)
<------><------><------>continue;
 
<------><------>if (i > topo->num_interfaces) {
<------><------><------>ret = -ENOSPC;
<------><------><------>continue;
<------><------>}
 
<------><------>memset(&kintf, 0, sizeof(kintf));
 
<------><------>/* Copy intf fields to userspace struct */
<------><------>kintf.id = intf->graph_obj.id;
<------><------>kintf.intf_type = intf->type;
<------><------>kintf.flags = intf->flags;
 
<------><------>if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
<------><------><------>struct media_intf_devnode *devnode;
 
<------><------><------>devnode = intf_to_devnode(intf);
 
<------><------><------>kintf.devnode.major = devnode->major;
<------><------><------>kintf.devnode.minor = devnode->minor;
<------><------>}
 
<------><------>if (copy_to_user(uintf, &kintf, sizeof(kintf)))
<------><------><------>ret = -EFAULT;
<------><------>uintf++;
<------>}
<------>topo->num_interfaces = i;
<------>topo->reserved2 = 0;
 
<------>/* Get pads and number of pads */
<------>i = 0;
<------>upad = media_get_uptr(topo->ptr_pads);
<------>media_device_for_each_pad(pad, mdev) {
<------><------>i++;
<------><------>if (ret || !upad)
<------><------><------>continue;
 
<------><------>if (i > topo->num_pads) {
<------><------><------>ret = -ENOSPC;
<------><------><------>continue;
<------><------>}
 
<------><------>memset(&kpad, 0, sizeof(kpad));
 
<------><------>/* Copy pad fields to userspace struct */
<------><------>kpad.id = pad->graph_obj.id;
<------><------>kpad.entity_id = pad->entity->graph_obj.id;
<------><------>kpad.flags = pad->flags;
<------><------>kpad.index = pad->index;
 
<------><------>if (copy_to_user(upad, &kpad, sizeof(kpad)))
<------><------><------>ret = -EFAULT;
<------><------>upad++;
<------>}
<------>topo->num_pads = i;
<------>topo->reserved3 = 0;
 
<------>/* Get links and number of links */
<------>i = 0;
<------>ulink = media_get_uptr(topo->ptr_links);
<------>media_device_for_each_link(link, mdev) {
<------><------>if (link->is_backlink)
<------><------><------>continue;
 
<------><------>i++;
 
<------><------>if (ret || !ulink)
<------><------><------>continue;
 
<------><------>if (i > topo->num_links) {
<------><------><------>ret = -ENOSPC;
<------><------><------>continue;
<------><------>}
 
<------><------>memset(&klink, 0, sizeof(klink));
 
<------><------>/* Copy link fields to userspace struct */
<------><------>klink.id = link->graph_obj.id;
<------><------>klink.source_id = link->gobj0->id;
<------><------>klink.sink_id = link->gobj1->id;
<------><------>klink.flags = link->flags;
 
<------><------>if (copy_to_user(ulink, &klink, sizeof(klink)))
<------><------><------>ret = -EFAULT;
<------><------>ulink++;
<------>}
<------>topo->num_links = i;
<------>topo->reserved4 = 0;
 
<------>return ret;
}
 
static long media_device_request_alloc(struct media_device *mdev, void *arg)
{
#ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
<------>int *alloc_fd = arg;
 
<------>if (!mdev->ops || !mdev->ops->req_validate || !mdev->ops->req_queue)
<------><------>return -ENOTTY;
 
<------>return media_request_alloc(mdev, alloc_fd);
#else
<------>return -ENOTTY;
#endif
}
 
static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd)
{
<------>if ((_IOC_DIR(cmd) & _IOC_WRITE) &&
<------>    copy_from_user(karg, uarg, _IOC_SIZE(cmd)))
<------><------>return -EFAULT;
 
<------>return 0;
}
 
static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
{
<------>if ((_IOC_DIR(cmd) & _IOC_READ) &&
<------>    copy_to_user(uarg, karg, _IOC_SIZE(cmd)))
<------><------>return -EFAULT;
 
<------>return 0;
}
 
/* Do acquire the graph mutex */
#define MEDIA_IOC_FL_GRAPH_MUTEX	BIT(0)
 
#define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user)		\
<------>[_IOC_NR(MEDIA_IOC_##__cmd)] = {				\
<------><------>.cmd = MEDIA_IOC_##__cmd,				\
<------><------>.fn = func,						\
<------><------>.flags = fl,						\
<------><------>.arg_from_user = from_user,				\
<------><------>.arg_to_user = to_user,					\
<------>}
 
#define MEDIA_IOC(__cmd, func, fl)					\
<------>MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)
 
/* the table is indexed by _IOC_NR(cmd) */
struct media_ioctl_info {
<------>unsigned int cmd;
<------>unsigned short flags;
<------>long (*fn)(struct media_device *dev, void *arg);
<------>long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);
<------>long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);
};
 
static const struct media_ioctl_info ioctl_info[] = {
<------>MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),
<------>MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),
<------>MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),
<------>MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),
<------>MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
<------>MEDIA_IOC(REQUEST_ALLOC, media_device_request_alloc, 0),
};
 
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 = devnode->media_dev;
<------>const struct media_ioctl_info *info;
<------>void __user *arg = (void __user *)__arg;
<------>char __karg[256], *karg = __karg;
<------>long ret;
 
<------>if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)
<------>    || ioctl_info[_IOC_NR(cmd)].cmd != cmd)
<------><------>return -ENOIOCTLCMD;
 
<------>info = &ioctl_info[_IOC_NR(cmd)];
 
<------>if (_IOC_SIZE(info->cmd) > sizeof(__karg)) {
<------><------>karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL);
<------><------>if (!karg)
<------><------><------>return -ENOMEM;
<------>}
 
<------>if (info->arg_from_user) {
<------><------>ret = info->arg_from_user(karg, arg, cmd);
<------><------>if (ret)
<------><------><------>goto out_free;
<------>}
 
<------>if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
<------><------>mutex_lock(&dev->graph_mutex);
 
<------>ret = info->fn(dev, karg);
 
<------>if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
<------><------>mutex_unlock(&dev->graph_mutex);
 
<------>if (!ret && info->arg_to_user)
<------><------>ret = info->arg_to_user(arg, karg, cmd);
 
out_free:
<------>if (karg != __karg)
<------><------>kfree(karg);
 
<------>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;
<------>int ret;
 
<------>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);
 
<------>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 */