Add helper functions that allow for easy instantiation of media_device
object basing on whether the media device contains video device with
given node name.
Signed-off-by: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
utils/media-ctl/libmediactl.c | 75 +++++++++++++++++++++++++++++++++++++++++
utils/media-ctl/mediactl.h | 30 +++++++++++++++++
2 files changed, 105 insertions(+)
diff --git a/utils/media-ctl/libmediactl.c b/utils/media-ctl/libmediactl.c
index 0be1845..3a45ecc 100644
--- a/utils/media-ctl/libmediactl.c
+++ b/utils/media-ctl/libmediactl.c
@@ -734,6 +734,44 @@ struct media_device *media_device_new(const char *devnode)
return media;
}
+struct media_device *media_device_new_by_entity_devname(char *entity_devname)
+{
+ struct media_device *media;
+ char media_devname[32];
+ struct media_entity *entity;
+ int i, ret;
+
+ /* query all available media devices */
+ for (i = 0;; ++i) {
+ sprintf(media_devname, "/dev/media%d", i);
+
+ media = media_device_new(media_devname);
+ if (media == NULL)
+ return NULL;
+
+ ret = media_device_enumerate(media);
+ if (ret < 0) {
+ media_dbg(media, "Failed to enumerate %s (%d)\n",
+ media_devname, ret);
+ goto err_dev_enum;
+ }
+
+ /* Check if the media device contains entity with entity_devname */
+ entity = media_get_entity_by_devname(media, entity_devname,
+ strlen(entity_devname));
+ if (entity)
+ return media;
+
+ if (media)
+ media_device_unref(media);
+ }
+
+err_dev_enum:
+ if (media)
+ media_device_unref(media);
+ return NULL;
+}
+
struct media_device *media_device_new_emulated(struct media_device_info *info)
{
struct media_device *media;
@@ -773,6 +811,43 @@ void media_device_unref(struct media_device *media)
free(media);
}
+int media_get_devname_by_fd(int fd, char *node_name)
+{
+ struct udev *udev;
+ struct media_entity tmp_entity;
+ struct stat stat;
+ int ret;
+
+ if (node_name == NULL)
+ return -EINVAL;
+
+ ret = fstat(fd, &stat);
+ if (ret < 0)
+ return -EINVAL;
+
+ tmp_entity.info.v4l.major = MAJOR(stat.st_rdev);
+ tmp_entity.info.v4l.minor = MINOR(stat.st_rdev);
+
+ ret = media_udev_open(&udev);
+ if (ret < 0)
+ printf("Can't get udev context\n");
+
+ /* Try to get the device name via udev */
+ ret = media_get_devname_udev(udev, &tmp_entity);
+ if (!ret)
+ goto out;
+
+ ret = media_get_devname_sysfs(&tmp_entity);
+ if (ret < 0)
+ goto err_get_devname;
+
+out:
+ strcpy(node_name, tmp_entity.devname);
+err_get_devname:
+ media_udev_close(udev);
+ return ret;
+}
+
int media_device_add_entity(struct media_device *media,
const struct media_entity_desc *desc,
const char *devnode)
diff --git a/utils/media-ctl/mediactl.h b/utils/media-ctl/mediactl.h
index 9db40a8..1d62191 100644
--- a/utils/media-ctl/mediactl.h
+++ b/utils/media-ctl/mediactl.h
@@ -76,6 +76,23 @@ struct media_device *media_device_new(const char *devnode);
struct media_device *media_device_new_emulated(struct media_device_info *info);
/**
+ * @brief Create a new media device if it comprises entity with given devname
+ * @param entity_devname - device node name of the entity to be matched.
+ *
+ * Query all media devices available in the system to find the one comprising
+ * the entity with given devname. If the media device is matched then its
+ * instance is created and initialized with enumerated entities and links.
+ * The returned device can be accessed.
+ *
+ * Media devices are reference-counted, see media_device_ref() and
+ * media_device_unref() for more information.
+ *
+ * @return A pointer to the new media device or NULL if video_devname cannot
+ * be matched or memory cannot be allocated.
+ */
+struct media_device *media_device_new_by_entity_devname(char *entity_devname);
+
+/**
* @brief Take a reference to the device.
* @param media - device instance.
*
@@ -240,6 +257,19 @@ const char *media_entity_get_devname(struct media_entity *entity);
*/
const char *media_entity_get_name(struct media_entity *entity);
+/**
+ * @brief Get the device node name by its file descriptor
+ * @param fd - file descriptor of a device.
+ * @param node_name - output device node name string.
+ *
+ * This function returns the full path and name to the device node corresponding
+ * to the given file descriptor.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int media_get_devname_by_fd(int fd, char *node_name);
+
+/**
* @brief Get the type of an entity.
* @param entity - the entity.
*
--
1.7.9.5
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