Back to home page

OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Media device
0004  *
0005  * Copyright (C) 2010 Nokia Corporation
0006  *
0007  * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
0008  *       Sakari Ailus <sakari.ailus@iki.fi>
0009  */
0010 
0011 #include <linux/compat.h>
0012 #include <linux/export.h>
0013 #include <linux/idr.h>
0014 #include <linux/ioctl.h>
0015 #include <linux/media.h>
0016 #include <linux/slab.h>
0017 #include <linux/types.h>
0018 #include <linux/pci.h>
0019 #include <linux/usb.h>
0020 #include <linux/version.h>
0021 
0022 #include <media/media-device.h>
0023 #include <media/media-devnode.h>
0024 #include <media/media-entity.h>
0025 #include <media/media-request.h>
0026 
0027 #ifdef CONFIG_MEDIA_CONTROLLER
0028 
0029 /*
0030  * Legacy defines from linux/media.h. This is the only place we need this
0031  * so we just define it here. The media.h header doesn't expose it to the
0032  * kernel to prevent it from being used by drivers, but here (and only here!)
0033  * we need it to handle the legacy behavior.
0034  */
0035 #define MEDIA_ENT_SUBTYPE_MASK          0x0000ffff
0036 #define MEDIA_ENT_T_DEVNODE_UNKNOWN     (MEDIA_ENT_F_OLD_BASE | \
0037                          MEDIA_ENT_SUBTYPE_MASK)
0038 
0039 /* -----------------------------------------------------------------------------
0040  * Userspace API
0041  */
0042 
0043 static inline void __user *media_get_uptr(__u64 arg)
0044 {
0045     return (void __user *)(uintptr_t)arg;
0046 }
0047 
0048 static int media_device_open(struct file *filp)
0049 {
0050     return 0;
0051 }
0052 
0053 static int media_device_close(struct file *filp)
0054 {
0055     return 0;
0056 }
0057 
0058 static long media_device_get_info(struct media_device *dev, void *arg)
0059 {
0060     struct media_device_info *info = arg;
0061 
0062     memset(info, 0, sizeof(*info));
0063 
0064     if (dev->driver_name[0])
0065         strscpy(info->driver, dev->driver_name, sizeof(info->driver));
0066     else
0067         strscpy(info->driver, dev->dev->driver->name,
0068             sizeof(info->driver));
0069 
0070     strscpy(info->model, dev->model, sizeof(info->model));
0071     strscpy(info->serial, dev->serial, sizeof(info->serial));
0072     strscpy(info->bus_info, dev->bus_info, sizeof(info->bus_info));
0073 
0074     info->media_version = LINUX_VERSION_CODE;
0075     info->driver_version = info->media_version;
0076     info->hw_revision = dev->hw_revision;
0077 
0078     return 0;
0079 }
0080 
0081 static struct media_entity *find_entity(struct media_device *mdev, u32 id)
0082 {
0083     struct media_entity *entity;
0084     int next = id & MEDIA_ENT_ID_FLAG_NEXT;
0085 
0086     id &= ~MEDIA_ENT_ID_FLAG_NEXT;
0087 
0088     media_device_for_each_entity(entity, mdev) {
0089         if (((media_entity_id(entity) == id) && !next) ||
0090             ((media_entity_id(entity) > id) && next)) {
0091             return entity;
0092         }
0093     }
0094 
0095     return NULL;
0096 }
0097 
0098 static long media_device_enum_entities(struct media_device *mdev, void *arg)
0099 {
0100     struct media_entity_desc *entd = arg;
0101     struct media_entity *ent;
0102 
0103     ent = find_entity(mdev, entd->id);
0104     if (ent == NULL)
0105         return -EINVAL;
0106 
0107     memset(entd, 0, sizeof(*entd));
0108 
0109     entd->id = media_entity_id(ent);
0110     if (ent->name)
0111         strscpy(entd->name, ent->name, sizeof(entd->name));
0112     entd->type = ent->function;
0113     entd->revision = 0;     /* Unused */
0114     entd->flags = ent->flags;
0115     entd->group_id = 0;     /* Unused */
0116     entd->pads = ent->num_pads;
0117     entd->links = ent->num_links - ent->num_backlinks;
0118 
0119     /*
0120      * Workaround for a bug at media-ctl <= v1.10 that makes it to
0121      * do the wrong thing if the entity function doesn't belong to
0122      * either MEDIA_ENT_F_OLD_BASE or MEDIA_ENT_F_OLD_SUBDEV_BASE
0123      * Ranges.
0124      *
0125      * Non-subdevices are expected to be at the MEDIA_ENT_F_OLD_BASE,
0126      * or, otherwise, will be silently ignored by media-ctl when
0127      * printing the graphviz diagram. So, map them into the devnode
0128      * old range.
0129      */
0130     if (ent->function < MEDIA_ENT_F_OLD_BASE ||
0131         ent->function > MEDIA_ENT_F_TUNER) {
0132         if (is_media_entity_v4l2_subdev(ent))
0133             entd->type = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
0134         else if (ent->function != MEDIA_ENT_F_IO_V4L)
0135             entd->type = MEDIA_ENT_T_DEVNODE_UNKNOWN;
0136     }
0137 
0138     memcpy(&entd->raw, &ent->info, sizeof(ent->info));
0139 
0140     return 0;
0141 }
0142 
0143 static void media_device_kpad_to_upad(const struct media_pad *kpad,
0144                       struct media_pad_desc *upad)
0145 {
0146     upad->entity = media_entity_id(kpad->entity);
0147     upad->index = kpad->index;
0148     upad->flags = kpad->flags;
0149 }
0150 
0151 static long media_device_enum_links(struct media_device *mdev, void *arg)
0152 {
0153     struct media_links_enum *links = arg;
0154     struct media_entity *entity;
0155 
0156     entity = find_entity(mdev, links->entity);
0157     if (entity == NULL)
0158         return -EINVAL;
0159 
0160     if (links->pads) {
0161         unsigned int p;
0162 
0163         for (p = 0; p < entity->num_pads; p++) {
0164             struct media_pad_desc pad;
0165 
0166             memset(&pad, 0, sizeof(pad));
0167             media_device_kpad_to_upad(&entity->pads[p], &pad);
0168             if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
0169                 return -EFAULT;
0170         }
0171     }
0172 
0173     if (links->links) {
0174         struct media_link *link;
0175         struct media_link_desc __user *ulink_desc = links->links;
0176 
0177         list_for_each_entry(link, &entity->links, list) {
0178             struct media_link_desc klink_desc;
0179 
0180             /* Ignore backlinks. */
0181             if (link->source->entity != entity)
0182                 continue;
0183             memset(&klink_desc, 0, sizeof(klink_desc));
0184             media_device_kpad_to_upad(link->source,
0185                           &klink_desc.source);
0186             media_device_kpad_to_upad(link->sink,
0187                           &klink_desc.sink);
0188             klink_desc.flags = link->flags;
0189             if (copy_to_user(ulink_desc, &klink_desc,
0190                      sizeof(*ulink_desc)))
0191                 return -EFAULT;
0192             ulink_desc++;
0193         }
0194     }
0195     memset(links->reserved, 0, sizeof(links->reserved));
0196 
0197     return 0;
0198 }
0199 
0200 static long media_device_setup_link(struct media_device *mdev, void *arg)
0201 {
0202     struct media_link_desc *linkd = arg;
0203     struct media_link *link = NULL;
0204     struct media_entity *source;
0205     struct media_entity *sink;
0206 
0207     /* Find the source and sink entities and link.
0208      */
0209     source = find_entity(mdev, linkd->source.entity);
0210     sink = find_entity(mdev, linkd->sink.entity);
0211 
0212     if (source == NULL || sink == NULL)
0213         return -EINVAL;
0214 
0215     if (linkd->source.index >= source->num_pads ||
0216         linkd->sink.index >= sink->num_pads)
0217         return -EINVAL;
0218 
0219     link = media_entity_find_link(&source->pads[linkd->source.index],
0220                       &sink->pads[linkd->sink.index]);
0221     if (link == NULL)
0222         return -EINVAL;
0223 
0224     memset(linkd->reserved, 0, sizeof(linkd->reserved));
0225 
0226     /* Setup the link on both entities. */
0227     return __media_entity_setup_link(link, linkd->flags);
0228 }
0229 
0230 static long media_device_get_topology(struct media_device *mdev, void *arg)
0231 {
0232     struct media_v2_topology *topo = arg;
0233     struct media_entity *entity;
0234     struct media_interface *intf;
0235     struct media_pad *pad;
0236     struct media_link *link;
0237     struct media_v2_entity kentity, __user *uentity;
0238     struct media_v2_interface kintf, __user *uintf;
0239     struct media_v2_pad kpad, __user *upad;
0240     struct media_v2_link klink, __user *ulink;
0241     unsigned int i;
0242     int ret = 0;
0243 
0244     topo->topology_version = mdev->topology_version;
0245 
0246     /* Get entities and number of entities */
0247     i = 0;
0248     uentity = media_get_uptr(topo->ptr_entities);
0249     media_device_for_each_entity(entity, mdev) {
0250         i++;
0251         if (ret || !uentity)
0252             continue;
0253 
0254         if (i > topo->num_entities) {
0255             ret = -ENOSPC;
0256             continue;
0257         }
0258 
0259         /* Copy fields to userspace struct if not error */
0260         memset(&kentity, 0, sizeof(kentity));
0261         kentity.id = entity->graph_obj.id;
0262         kentity.function = entity->function;
0263         kentity.flags = entity->flags;
0264         strscpy(kentity.name, entity->name,
0265             sizeof(kentity.name));
0266 
0267         if (copy_to_user(uentity, &kentity, sizeof(kentity)))
0268             ret = -EFAULT;
0269         uentity++;
0270     }
0271     topo->num_entities = i;
0272     topo->reserved1 = 0;
0273 
0274     /* Get interfaces and number of interfaces */
0275     i = 0;
0276     uintf = media_get_uptr(topo->ptr_interfaces);
0277     media_device_for_each_intf(intf, mdev) {
0278         i++;
0279         if (ret || !uintf)
0280             continue;
0281 
0282         if (i > topo->num_interfaces) {
0283             ret = -ENOSPC;
0284             continue;
0285         }
0286 
0287         memset(&kintf, 0, sizeof(kintf));
0288 
0289         /* Copy intf fields to userspace struct */
0290         kintf.id = intf->graph_obj.id;
0291         kintf.intf_type = intf->type;
0292         kintf.flags = intf->flags;
0293 
0294         if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
0295             struct media_intf_devnode *devnode;
0296 
0297             devnode = intf_to_devnode(intf);
0298 
0299             kintf.devnode.major = devnode->major;
0300             kintf.devnode.minor = devnode->minor;
0301         }
0302 
0303         if (copy_to_user(uintf, &kintf, sizeof(kintf)))
0304             ret = -EFAULT;
0305         uintf++;
0306     }
0307     topo->num_interfaces = i;
0308     topo->reserved2 = 0;
0309 
0310     /* Get pads and number of pads */
0311     i = 0;
0312     upad = media_get_uptr(topo->ptr_pads);
0313     media_device_for_each_pad(pad, mdev) {
0314         i++;
0315         if (ret || !upad)
0316             continue;
0317 
0318         if (i > topo->num_pads) {
0319             ret = -ENOSPC;
0320             continue;
0321         }
0322 
0323         memset(&kpad, 0, sizeof(kpad));
0324 
0325         /* Copy pad fields to userspace struct */
0326         kpad.id = pad->graph_obj.id;
0327         kpad.entity_id = pad->entity->graph_obj.id;
0328         kpad.flags = pad->flags;
0329         kpad.index = pad->index;
0330 
0331         if (copy_to_user(upad, &kpad, sizeof(kpad)))
0332             ret = -EFAULT;
0333         upad++;
0334     }
0335     topo->num_pads = i;
0336     topo->reserved3 = 0;
0337 
0338     /* Get links and number of links */
0339     i = 0;
0340     ulink = media_get_uptr(topo->ptr_links);
0341     media_device_for_each_link(link, mdev) {
0342         if (link->is_backlink)
0343             continue;
0344 
0345         i++;
0346 
0347         if (ret || !ulink)
0348             continue;
0349 
0350         if (i > topo->num_links) {
0351             ret = -ENOSPC;
0352             continue;
0353         }
0354 
0355         memset(&klink, 0, sizeof(klink));
0356 
0357         /* Copy link fields to userspace struct */
0358         klink.id = link->graph_obj.id;
0359         klink.source_id = link->gobj0->id;
0360         klink.sink_id = link->gobj1->id;
0361         klink.flags = link->flags;
0362 
0363         if (copy_to_user(ulink, &klink, sizeof(klink)))
0364             ret = -EFAULT;
0365         ulink++;
0366     }
0367     topo->num_links = i;
0368     topo->reserved4 = 0;
0369 
0370     return ret;
0371 }
0372 
0373 static long media_device_request_alloc(struct media_device *mdev, void *arg)
0374 {
0375 #ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
0376     int *alloc_fd = arg;
0377 
0378     if (!mdev->ops || !mdev->ops->req_validate || !mdev->ops->req_queue)
0379         return -ENOTTY;
0380 
0381     return media_request_alloc(mdev, alloc_fd);
0382 #else
0383     return -ENOTTY;
0384 #endif
0385 }
0386 
0387 static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd)
0388 {
0389     if ((_IOC_DIR(cmd) & _IOC_WRITE) &&
0390         copy_from_user(karg, uarg, _IOC_SIZE(cmd)))
0391         return -EFAULT;
0392 
0393     return 0;
0394 }
0395 
0396 static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
0397 {
0398     if ((_IOC_DIR(cmd) & _IOC_READ) &&
0399         copy_to_user(uarg, karg, _IOC_SIZE(cmd)))
0400         return -EFAULT;
0401 
0402     return 0;
0403 }
0404 
0405 /* Do acquire the graph mutex */
0406 #define MEDIA_IOC_FL_GRAPH_MUTEX    BIT(0)
0407 
0408 #define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user)      \
0409     [_IOC_NR(MEDIA_IOC_##__cmd)] = {                \
0410         .cmd = MEDIA_IOC_##__cmd,               \
0411         .fn = func,                     \
0412         .flags = fl,                        \
0413         .arg_from_user = from_user,             \
0414         .arg_to_user = to_user,                 \
0415     }
0416 
0417 #define MEDIA_IOC(__cmd, func, fl)                  \
0418     MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)
0419 
0420 /* the table is indexed by _IOC_NR(cmd) */
0421 struct media_ioctl_info {
0422     unsigned int cmd;
0423     unsigned short flags;
0424     long (*fn)(struct media_device *dev, void *arg);
0425     long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);
0426     long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);
0427 };
0428 
0429 static const struct media_ioctl_info ioctl_info[] = {
0430     MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),
0431     MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),
0432     MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),
0433     MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),
0434     MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
0435     MEDIA_IOC(REQUEST_ALLOC, media_device_request_alloc, 0),
0436 };
0437 
0438 static long media_device_ioctl(struct file *filp, unsigned int cmd,
0439                    unsigned long __arg)
0440 {
0441     struct media_devnode *devnode = media_devnode_data(filp);
0442     struct media_device *dev = devnode->media_dev;
0443     const struct media_ioctl_info *info;
0444     void __user *arg = (void __user *)__arg;
0445     char __karg[256], *karg = __karg;
0446     long ret;
0447 
0448     if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)
0449         || ioctl_info[_IOC_NR(cmd)].cmd != cmd)
0450         return -ENOIOCTLCMD;
0451 
0452     info = &ioctl_info[_IOC_NR(cmd)];
0453 
0454     if (_IOC_SIZE(info->cmd) > sizeof(__karg)) {
0455         karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL);
0456         if (!karg)
0457             return -ENOMEM;
0458     }
0459 
0460     if (info->arg_from_user) {
0461         ret = info->arg_from_user(karg, arg, cmd);
0462         if (ret)
0463             goto out_free;
0464     }
0465 
0466     if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
0467         mutex_lock(&dev->graph_mutex);
0468 
0469     ret = info->fn(dev, karg);
0470 
0471     if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
0472         mutex_unlock(&dev->graph_mutex);
0473 
0474     if (!ret && info->arg_to_user)
0475         ret = info->arg_to_user(arg, karg, cmd);
0476 
0477 out_free:
0478     if (karg != __karg)
0479         kfree(karg);
0480 
0481     return ret;
0482 }
0483 
0484 #ifdef CONFIG_COMPAT
0485 
0486 struct media_links_enum32 {
0487     __u32 entity;
0488     compat_uptr_t pads; /* struct media_pad_desc * */
0489     compat_uptr_t links; /* struct media_link_desc * */
0490     __u32 reserved[4];
0491 };
0492 
0493 static long media_device_enum_links32(struct media_device *mdev,
0494                       struct media_links_enum32 __user *ulinks)
0495 {
0496     struct media_links_enum links;
0497     compat_uptr_t pads_ptr, links_ptr;
0498     int ret;
0499 
0500     memset(&links, 0, sizeof(links));
0501 
0502     if (get_user(links.entity, &ulinks->entity)
0503         || get_user(pads_ptr, &ulinks->pads)
0504         || get_user(links_ptr, &ulinks->links))
0505         return -EFAULT;
0506 
0507     links.pads = compat_ptr(pads_ptr);
0508     links.links = compat_ptr(links_ptr);
0509 
0510     ret = media_device_enum_links(mdev, &links);
0511     if (ret)
0512         return ret;
0513 
0514     if (copy_to_user(ulinks->reserved, links.reserved,
0515              sizeof(ulinks->reserved)))
0516         return -EFAULT;
0517     return 0;
0518 }
0519 
0520 #define MEDIA_IOC_ENUM_LINKS32      _IOWR('|', 0x02, struct media_links_enum32)
0521 
0522 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
0523                       unsigned long arg)
0524 {
0525     struct media_devnode *devnode = media_devnode_data(filp);
0526     struct media_device *dev = devnode->media_dev;
0527     long ret;
0528 
0529     switch (cmd) {
0530     case MEDIA_IOC_ENUM_LINKS32:
0531         mutex_lock(&dev->graph_mutex);
0532         ret = media_device_enum_links32(dev,
0533                 (struct media_links_enum32 __user *)arg);
0534         mutex_unlock(&dev->graph_mutex);
0535         break;
0536 
0537     default:
0538         return media_device_ioctl(filp, cmd, arg);
0539     }
0540 
0541     return ret;
0542 }
0543 #endif /* CONFIG_COMPAT */
0544 
0545 static const struct media_file_operations media_device_fops = {
0546     .owner = THIS_MODULE,
0547     .open = media_device_open,
0548     .ioctl = media_device_ioctl,
0549 #ifdef CONFIG_COMPAT
0550     .compat_ioctl = media_device_compat_ioctl,
0551 #endif /* CONFIG_COMPAT */
0552     .release = media_device_close,
0553 };
0554 
0555 /* -----------------------------------------------------------------------------
0556  * sysfs
0557  */
0558 
0559 static ssize_t model_show(struct device *cd,
0560               struct device_attribute *attr, char *buf)
0561 {
0562     struct media_devnode *devnode = to_media_devnode(cd);
0563     struct media_device *mdev = devnode->media_dev;
0564 
0565     return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
0566 }
0567 
0568 static DEVICE_ATTR_RO(model);
0569 
0570 /* -----------------------------------------------------------------------------
0571  * Registration/unregistration
0572  */
0573 
0574 static void media_device_release(struct media_devnode *devnode)
0575 {
0576     dev_dbg(devnode->parent, "Media device released\n");
0577 }
0578 
0579 static void __media_device_unregister_entity(struct media_entity *entity)
0580 {
0581     struct media_device *mdev = entity->graph_obj.mdev;
0582     struct media_link *link, *tmp;
0583     struct media_interface *intf;
0584     unsigned int i;
0585 
0586     ida_free(&mdev->entity_internal_idx, entity->internal_idx);
0587 
0588     /* Remove all interface links pointing to this entity */
0589     list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
0590         list_for_each_entry_safe(link, tmp, &intf->links, list) {
0591             if (link->entity == entity)
0592                 __media_remove_intf_link(link);
0593         }
0594     }
0595 
0596     /* Remove all data links that belong to this entity */
0597     __media_entity_remove_links(entity);
0598 
0599     /* Remove all pads that belong to this entity */
0600     for (i = 0; i < entity->num_pads; i++)
0601         media_gobj_destroy(&entity->pads[i].graph_obj);
0602 
0603     /* Remove the entity */
0604     media_gobj_destroy(&entity->graph_obj);
0605 
0606     /* invoke entity_notify callbacks to handle entity removal?? */
0607 }
0608 
0609 int __must_check media_device_register_entity(struct media_device *mdev,
0610                           struct media_entity *entity)
0611 {
0612     struct media_entity_notify *notify, *next;
0613     unsigned int i;
0614     int ret;
0615 
0616     if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||
0617         entity->function == MEDIA_ENT_F_UNKNOWN)
0618         dev_warn(mdev->dev,
0619              "Entity type for entity %s was not initialized!\n",
0620              entity->name);
0621 
0622     /* Warn if we apparently re-register an entity */
0623     WARN_ON(entity->graph_obj.mdev != NULL);
0624     entity->graph_obj.mdev = mdev;
0625     INIT_LIST_HEAD(&entity->links);
0626     entity->num_links = 0;
0627     entity->num_backlinks = 0;
0628 
0629     ret = ida_alloc_min(&mdev->entity_internal_idx, 1, GFP_KERNEL);
0630     if (ret < 0)
0631         return ret;
0632     entity->internal_idx = ret;
0633 
0634     mutex_lock(&mdev->graph_mutex);
0635     mdev->entity_internal_idx_max =
0636         max(mdev->entity_internal_idx_max, entity->internal_idx);
0637 
0638     /* Initialize media_gobj embedded at the entity */
0639     media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
0640 
0641     /* Initialize objects at the pads */
0642     for (i = 0; i < entity->num_pads; i++)
0643         media_gobj_create(mdev, MEDIA_GRAPH_PAD,
0644                    &entity->pads[i].graph_obj);
0645 
0646     /* invoke entity_notify callbacks */
0647     list_for_each_entry_safe(notify, next, &mdev->entity_notify, list)
0648         notify->notify(entity, notify->notify_data);
0649 
0650     if (mdev->entity_internal_idx_max
0651         >= mdev->pm_count_walk.ent_enum.idx_max) {
0652         struct media_graph new = { .top = 0 };
0653 
0654         /*
0655          * Initialise the new graph walk before cleaning up
0656          * the old one in order not to spoil the graph walk
0657          * object of the media device if graph walk init fails.
0658          */
0659         ret = media_graph_walk_init(&new, mdev);
0660         if (ret) {
0661             __media_device_unregister_entity(entity);
0662             mutex_unlock(&mdev->graph_mutex);
0663             return ret;
0664         }
0665         media_graph_walk_cleanup(&mdev->pm_count_walk);
0666         mdev->pm_count_walk = new;
0667     }
0668     mutex_unlock(&mdev->graph_mutex);
0669 
0670     return 0;
0671 }
0672 EXPORT_SYMBOL_GPL(media_device_register_entity);
0673 
0674 void media_device_unregister_entity(struct media_entity *entity)
0675 {
0676     struct media_device *mdev = entity->graph_obj.mdev;
0677 
0678     if (mdev == NULL)
0679         return;
0680 
0681     mutex_lock(&mdev->graph_mutex);
0682     __media_device_unregister_entity(entity);
0683     mutex_unlock(&mdev->graph_mutex);
0684 }
0685 EXPORT_SYMBOL_GPL(media_device_unregister_entity);
0686 
0687 void media_device_init(struct media_device *mdev)
0688 {
0689     INIT_LIST_HEAD(&mdev->entities);
0690     INIT_LIST_HEAD(&mdev->interfaces);
0691     INIT_LIST_HEAD(&mdev->pads);
0692     INIT_LIST_HEAD(&mdev->links);
0693     INIT_LIST_HEAD(&mdev->entity_notify);
0694 
0695     mutex_init(&mdev->req_queue_mutex);
0696     mutex_init(&mdev->graph_mutex);
0697     ida_init(&mdev->entity_internal_idx);
0698 
0699     atomic_set(&mdev->request_id, 0);
0700 
0701     if (!*mdev->bus_info)
0702         media_set_bus_info(mdev->bus_info, sizeof(mdev->bus_info),
0703                    mdev->dev);
0704 
0705     dev_dbg(mdev->dev, "Media device initialized\n");
0706 }
0707 EXPORT_SYMBOL_GPL(media_device_init);
0708 
0709 void media_device_cleanup(struct media_device *mdev)
0710 {
0711     ida_destroy(&mdev->entity_internal_idx);
0712     mdev->entity_internal_idx_max = 0;
0713     media_graph_walk_cleanup(&mdev->pm_count_walk);
0714     mutex_destroy(&mdev->graph_mutex);
0715     mutex_destroy(&mdev->req_queue_mutex);
0716 }
0717 EXPORT_SYMBOL_GPL(media_device_cleanup);
0718 
0719 int __must_check __media_device_register(struct media_device *mdev,
0720                      struct module *owner)
0721 {
0722     struct media_devnode *devnode;
0723     int ret;
0724 
0725     devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
0726     if (!devnode)
0727         return -ENOMEM;
0728 
0729     /* Register the device node. */
0730     mdev->devnode = devnode;
0731     devnode->fops = &media_device_fops;
0732     devnode->parent = mdev->dev;
0733     devnode->release = media_device_release;
0734 
0735     /* Set version 0 to indicate user-space that the graph is static */
0736     mdev->topology_version = 0;
0737 
0738     ret = media_devnode_register(mdev, devnode, owner);
0739     if (ret < 0) {
0740         /* devnode free is handled in media_devnode_*() */
0741         mdev->devnode = NULL;
0742         return ret;
0743     }
0744 
0745     ret = device_create_file(&devnode->dev, &dev_attr_model);
0746     if (ret < 0) {
0747         /* devnode free is handled in media_devnode_*() */
0748         mdev->devnode = NULL;
0749         media_devnode_unregister_prepare(devnode);
0750         media_devnode_unregister(devnode);
0751         return ret;
0752     }
0753 
0754     dev_dbg(mdev->dev, "Media device registered\n");
0755 
0756     return 0;
0757 }
0758 EXPORT_SYMBOL_GPL(__media_device_register);
0759 
0760 int __must_check media_device_register_entity_notify(struct media_device *mdev,
0761                     struct media_entity_notify *nptr)
0762 {
0763     mutex_lock(&mdev->graph_mutex);
0764     list_add_tail(&nptr->list, &mdev->entity_notify);
0765     mutex_unlock(&mdev->graph_mutex);
0766     return 0;
0767 }
0768 EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
0769 
0770 /*
0771  * Note: Should be called with mdev->lock held.
0772  */
0773 static void __media_device_unregister_entity_notify(struct media_device *mdev,
0774                     struct media_entity_notify *nptr)
0775 {
0776     list_del(&nptr->list);
0777 }
0778 
0779 void media_device_unregister_entity_notify(struct media_device *mdev,
0780                     struct media_entity_notify *nptr)
0781 {
0782     mutex_lock(&mdev->graph_mutex);
0783     __media_device_unregister_entity_notify(mdev, nptr);
0784     mutex_unlock(&mdev->graph_mutex);
0785 }
0786 EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);
0787 
0788 void media_device_unregister(struct media_device *mdev)
0789 {
0790     struct media_entity *entity;
0791     struct media_entity *next;
0792     struct media_interface *intf, *tmp_intf;
0793     struct media_entity_notify *notify, *nextp;
0794 
0795     if (mdev == NULL)
0796         return;
0797 
0798     mutex_lock(&mdev->graph_mutex);
0799 
0800     /* Check if mdev was ever registered at all */
0801     if (!media_devnode_is_registered(mdev->devnode)) {
0802         mutex_unlock(&mdev->graph_mutex);
0803         return;
0804     }
0805 
0806     /* Clear the devnode register bit to avoid races with media dev open */
0807     media_devnode_unregister_prepare(mdev->devnode);
0808 
0809     /* Remove all entities from the media device */
0810     list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
0811         __media_device_unregister_entity(entity);
0812 
0813     /* Remove all entity_notify callbacks from the media device */
0814     list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list)
0815         __media_device_unregister_entity_notify(mdev, notify);
0816 
0817     /* Remove all interfaces from the media device */
0818     list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
0819                  graph_obj.list) {
0820         /*
0821          * Unlink the interface, but don't free it here; the
0822          * module which created it is responsible for freeing
0823          * it
0824          */
0825         __media_remove_intf_links(intf);
0826         media_gobj_destroy(&intf->graph_obj);
0827     }
0828 
0829     mutex_unlock(&mdev->graph_mutex);
0830 
0831     dev_dbg(mdev->dev, "Media device unregistered\n");
0832 
0833     device_remove_file(&mdev->devnode->dev, &dev_attr_model);
0834     media_devnode_unregister(mdev->devnode);
0835     /* devnode free is handled in media_devnode_*() */
0836     mdev->devnode = NULL;
0837 }
0838 EXPORT_SYMBOL_GPL(media_device_unregister);
0839 
0840 #if IS_ENABLED(CONFIG_PCI)
0841 void media_device_pci_init(struct media_device *mdev,
0842                struct pci_dev *pci_dev,
0843                const char *name)
0844 {
0845     mdev->dev = &pci_dev->dev;
0846 
0847     if (name)
0848         strscpy(mdev->model, name, sizeof(mdev->model));
0849     else
0850         strscpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model));
0851 
0852     sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev));
0853 
0854     mdev->hw_revision = (pci_dev->subsystem_vendor << 16)
0855                 | pci_dev->subsystem_device;
0856 
0857     media_device_init(mdev);
0858 }
0859 EXPORT_SYMBOL_GPL(media_device_pci_init);
0860 #endif
0861 
0862 #if IS_ENABLED(CONFIG_USB)
0863 void __media_device_usb_init(struct media_device *mdev,
0864                  struct usb_device *udev,
0865                  const char *board_name,
0866                  const char *driver_name)
0867 {
0868     mdev->dev = &udev->dev;
0869 
0870     if (driver_name)
0871         strscpy(mdev->driver_name, driver_name,
0872             sizeof(mdev->driver_name));
0873 
0874     if (board_name)
0875         strscpy(mdev->model, board_name, sizeof(mdev->model));
0876     else if (udev->product)
0877         strscpy(mdev->model, udev->product, sizeof(mdev->model));
0878     else
0879         strscpy(mdev->model, "unknown model", sizeof(mdev->model));
0880     if (udev->serial)
0881         strscpy(mdev->serial, udev->serial, sizeof(mdev->serial));
0882     usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info));
0883     mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
0884 
0885     media_device_init(mdev);
0886 }
0887 EXPORT_SYMBOL_GPL(__media_device_usb_init);
0888 #endif
0889 
0890 
0891 #endif /* CONFIG_MEDIA_CONTROLLER */
[ Source navigation ] [ Diff markup ] [ Identifier search ] [ general search ]

This page was automatically generated by the 2.1.0 LXR engine.

The LXR team
Valid CSS 2.1! Valid HTML 4.01!