| // 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 <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; |
| |
| /* 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; |
| |
| memset(linkd->reserved, 0, sizeof(linkd->reserved)); |
| |
| /* Setup the link on both entities. */ |
| 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 model_show(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_RO(model); |
| |
| /* ----------------------------------------------------------------------------- |
| * 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; |
| struct media_pad *iter; |
| |
| 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 */ |
| media_entity_for_each_pad(entity, iter) |
| media_gobj_destroy(&iter->graph_obj); |
| |
| /* Remove the entity */ |
| media_gobj_destroy(&entity->graph_obj); |
| |
| /* invoke entity_notify callbacks to handle entity removal?? */ |
| } |
| |
| int __must_check media_device_register_entity(struct media_device *mdev, |
| struct media_entity *entity) |
| { |
| struct media_entity_notify *notify, *next; |
| struct media_pad *iter; |
| 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 */ |
| media_entity_for_each_pad(entity, iter) |
| media_gobj_create(mdev, MEDIA_GRAPH_PAD, &iter->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); |
| |
| 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); |
| |
| if (!*mdev->bus_info) |
| media_set_bus_info(mdev->bus_info, sizeof(mdev->bus_info), |
| mdev->dev); |
| |
| 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 */ |