--- /dev/null
+/*
+ *
+ * V 4 L 2 D R I V E R H E L P E R A P I
+ *
+ * Moved from videodev2.h
+ *
+ * Some commonly needed functions for drivers (v4l2-common.o module)
+ */
+#ifndef _V4L2_DEV_H
+#define _V4L2_DEV_H
+
+#include <linux/poll.h>
+#include <linux/fs.h>
+#include <linux/device.h>
+#include <linux/cdev.h>
+#include <linux/mutex.h>
+#include <linux/videodev2.h>
+
+#include <media/media-entity.h>
+
+#define VIDEO_MAJOR 81
+
+#define VFL_TYPE_GRABBER 0
+#define VFL_TYPE_VBI 1
+#define VFL_TYPE_RADIO 2
+#define VFL_TYPE_SUBDEV 3
+#define VFL_TYPE_SDR 4
+#define VFL_TYPE_MAX 5
+
+/* Is this a receiver, transmitter or mem-to-mem? */
+/* Ignored for VFL_TYPE_SUBDEV. */
+#define VFL_DIR_RX 0
+#define VFL_DIR_TX 1
+#define VFL_DIR_M2M 2
+
+struct v4l2_ioctl_callbacks;
+struct video_device;
+struct v4l2_device;
+struct v4l2_ctrl_handler;
+
+/* Flag to mark the video_device struct as registered.
+ Drivers can clear this flag if they want to block all future
+ device access. It is cleared by video_unregister_device. */
+#define V4L2_FL_REGISTERED (0)
+/* file->private_data points to struct v4l2_fh */
+#define V4L2_FL_USES_V4L2_FH (1)
+
+/* Priority helper functions */
+
+struct v4l2_prio_state {
+ atomic_t prios[4];
+};
+
+void v4l2_prio_init(struct v4l2_prio_state *global);
+int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
+ enum v4l2_priority new);
+void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
+void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local);
+enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
+int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local);
+
+
+struct v4l2_file_operations {
+ struct module *owner;
+ ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
+ ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
+ unsigned int (*poll) (struct file *, struct poll_table_struct *);
+ long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
+#ifdef CONFIG_COMPAT
+ long (*compat_ioctl32) (struct file *, unsigned int, unsigned long);
+#endif
+ unsigned long (*get_unmapped_area) (struct file *, unsigned long,
+ unsigned long, unsigned long, unsigned long);
+ int (*mmap) (struct file *, struct vm_area_struct *);
+ int (*open) (struct file *);
+ int (*release) (struct file *);
+};
+
+/*
+ * Newer version of video_device, handled by videodev2.c
+ * This version moves redundant code from video device code to
+ * the common handler
+ */
+
+struct video_device
+{
+#if defined(CONFIG_MEDIA_CONTROLLER)
+ struct media_entity entity;
+#endif
+ /* device ops */
+ const struct v4l2_file_operations *fops;
+
+ /* sysfs */
+ struct device dev; /* v4l device */
+ struct cdev *cdev; /* character device */
+
+ struct v4l2_device *v4l2_dev; /* v4l2_device parent */
+ /* Only set parent if that can't be deduced from v4l2_dev */
+ struct device *dev_parent; /* device parent */
+
+ /* Control handler associated with this device node. May be NULL. */
+ struct v4l2_ctrl_handler *ctrl_handler;
+
+ /* vb2_queue associated with this device node. May be NULL. */
+ struct vb2_queue *queue;
+
+ /* Priority state. If NULL, then v4l2_dev->prio will be used. */
+ struct v4l2_prio_state *prio;
+
+ /* device info */
+ char name[32];
+ int vfl_type; /* device type */
+ int vfl_dir; /* receiver, transmitter or m2m */
+ /* 'minor' is set to -1 if the registration failed */
+ int minor;
+ u16 num;
+ /* use bitops to set/clear/test flags */
+ unsigned long flags;
+ /* attribute to differentiate multiple indices on one physical device */
+ int index;
+
+ /* V4L2 file handles */
+ spinlock_t fh_lock; /* Lock for all v4l2_fhs */
+ struct list_head fh_list; /* List of struct v4l2_fh */
+
+ /* Internal device debug flags, not for use by drivers */
+ int dev_debug;
+
+ /* Video standard vars */
+ v4l2_std_id tvnorms; /* Supported tv norms */
+
+ /* callbacks */
+ void (*release)(struct video_device *vdev);
+
+ /* ioctl callbacks */
+ const struct v4l2_ioctl_ops *ioctl_ops;
+ DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE);
+
+ /* serialization lock */
+ DECLARE_BITMAP(disable_locking, BASE_VIDIOC_PRIVATE);
+ struct mutex *lock;
+};
+
+#define media_entity_to_video_device(__e) \
+ container_of(__e, struct video_device, entity)
+/* dev to video-device */
+#define to_video_device(cd) container_of(cd, struct video_device, dev)
+
+int __must_check __video_register_device(struct video_device *vdev, int type,
+ int nr, int warn_if_nr_in_use, struct module *owner);
+
+/* Register video devices. Note that if video_register_device fails,
+ the release() callback of the video_device structure is *not* called, so
+ the caller is responsible for freeing any data. Usually that means that
+ you call video_device_release() on failure. */
+static inline int __must_check video_register_device(struct video_device *vdev,
+ int type, int nr)
+{
+ return __video_register_device(vdev, type, nr, 1, vdev->fops->owner);
+}
+
+/* Same as video_register_device, but no warning is issued if the desired
+ device node number was already in use. */
+static inline int __must_check video_register_device_no_warn(
+ struct video_device *vdev, int type, int nr)
+{
+ return __video_register_device(vdev, type, nr, 0, vdev->fops->owner);
+}
+
+/* Unregister video devices. Will do nothing if vdev == NULL or
+ video_is_registered() returns false. */
+void video_unregister_device(struct video_device *vdev);
+
+/* helper functions to alloc/release struct video_device, the
+ latter can also be used for video_device->release(). */
+struct video_device * __must_check video_device_alloc(void);
+
+/* this release function frees the vdev pointer */
+void video_device_release(struct video_device *vdev);
+
+/* this release function does nothing, use when the video_device is a
+ static global struct. Note that having a static video_device is
+ a dubious construction at best. */
+void video_device_release_empty(struct video_device *vdev);
+
+/* returns true if cmd is a known V4L2 ioctl */
+bool v4l2_is_known_ioctl(unsigned int cmd);
+
+/* mark that this command shouldn't use core locking */
+static inline void v4l2_disable_ioctl_locking(struct video_device *vdev, unsigned int cmd)
+{
+ if (_IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
+ set_bit(_IOC_NR(cmd), vdev->disable_locking);
+}
+
+/* Mark that this command isn't implemented. This must be called before
+ video_device_register. See also the comments in determine_valid_ioctls().
+ This function allows drivers to provide just one v4l2_ioctl_ops struct, but
+ disable ioctls based on the specific card that is actually found. */
+static inline void v4l2_disable_ioctl(struct video_device *vdev, unsigned int cmd)
+{
+ if (_IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
+ set_bit(_IOC_NR(cmd), vdev->valid_ioctls);
+}
+
+/* helper functions to access driver private data. */
+static inline void *video_get_drvdata(struct video_device *vdev)
+{
+ return dev_get_drvdata(&vdev->dev);
+}
+
+static inline void video_set_drvdata(struct video_device *vdev, void *data)
+{
+ dev_set_drvdata(&vdev->dev, data);
+}
+
+struct video_device *video_devdata(struct file *file);
+
+/* Combine video_get_drvdata and video_devdata as this is
+ used very often. */
+static inline void *video_drvdata(struct file *file)
+{
+ return video_get_drvdata(video_devdata(file));
+}
+
+static inline const char *video_device_node_name(struct video_device *vdev)
+{
+ return dev_name(&vdev->dev);
+}
+
+static inline int video_is_registered(struct video_device *vdev)
+{
+ return test_bit(V4L2_FL_REGISTERED, &vdev->flags);
+}
+
+#endif /* _V4L2_DEV_H */
Code Review / kvmfornfv.git / blobdiff