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273 lines
9 KiB
C
273 lines
9 KiB
C
/*
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*
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* V 4 L 2 D R I V E R H E L P E R A P I
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*
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* Moved from videodev2.h
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*
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* Some commonly needed functions for drivers (v4l2-common.o module)
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*/
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#ifndef _V4L2_DEV_H
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#define _V4L2_DEV_H
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#if 0
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#include <linux/poll.h>
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#include <linux/fs.h>
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#include <linux/device.h>
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#include <linux/cdev.h>
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#include <linux/mutex.h>
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#endif
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#include "v4l2-osdep.h"
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#include "uapi_videodev2.h"
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#include "media-entity.h"
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#define VIDEO_MAJOR 81
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#define VFL_TYPE_GRABBER 0
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#define VFL_TYPE_VBI 1
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#define VFL_TYPE_RADIO 2
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#define VFL_TYPE_SUBDEV 3
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#define VFL_TYPE_MAX 4
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/* Is this a receiver, transmitter or mem-to-mem? */
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/* Ignored for VFL_TYPE_SUBDEV. */
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#define VFL_DIR_RX 0
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#define VFL_DIR_TX 1
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#define VFL_DIR_M2M 2
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//struct v4l2_ioctl_callbacks; // can't find out from the kernel source code
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struct video_device;
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struct v4l2_device;
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struct v4l2_ctrl_handler;
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enum v4l2_priority;
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/* Flag to mark the video_device struct as registered.
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Drivers can clear this flag if they want to block all future
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device access. It is cleared by video_unregister_device. */
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#define V4L2_FL_REGISTERED (0)
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/* file->private_data points to struct v4l2_fh */
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#define V4L2_FL_USES_V4L2_FH (1)
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/* Use the prio field of v4l2_fh for core priority checking */
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#define V4L2_FL_USE_FH_PRIO (2)
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/* Priority helper functions */
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struct v4l2_prio_state {
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atomic_t prios[4];
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};
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/*
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enum v4l2_priority {
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V4L2_PRIORITY_UNSET = 0, // 不初始化
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V4L2_PRIORITY_BACKGROUND = 1, // 背景
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V4L2_PRIORITY_INTERACTIVE = 2, // 互動
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V4L2_PRIORITY_RECORD = 3, // 紀錄
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V4L2_PRIORITY_DEFAULT = V4L2_PRIORITY_INTERACTIVE,
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};
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优先權是為了Multiple Opens操作，當可以支持device同時被多個thread 打開(i.e open())
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需要用這優先權去區分哪個操作更重要，使用的那個優先級別，的prios[4]就加一。
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*/
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void v4l2_prio_init(struct v4l2_prio_state *global);
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int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
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enum v4l2_priority new);
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void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
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void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local);
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enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
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int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local);
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struct v4l2_file_operations {
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//struct module *owner;
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//ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
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//ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
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//unsigned int (*poll) (struct file *, struct poll_table_struct *);
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long (*ioctl) (unsigned int, void *);
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long (*unlocked_ioctl) (unsigned int, void *);
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#ifdef CONFIG_COMPAT
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long (*compat_ioctl32) (unsigned int, void *);
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#endif
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//unsigned long (*get_unmapped_area) (struct file *, unsigned long,
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// unsigned long, unsigned long, unsigned long);
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int (*mmap) ();
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int (*open) ();
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int (*release) ();
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};
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/*
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* Newer version of video_device, handled by videodev2.c
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* This version moves redundant code from video device code to
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* the common handler
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*/
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struct video_device
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{
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#if defined(CONFIG_MEDIA_CONTROLLER)
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struct media_entity entity;
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#endif
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/* device ops */
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const struct v4l2_file_operations *fops;
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/* sysfs */
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//struct device dev; /* v4l device,this is mainlt for sysfs */
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unsigned long dev; /* replace to the reference count */
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void *dev_driver_data;
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const char *init_name; /* initial name of the device */
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void (*dev_release)(); /* release call back in origonal dev */
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//struct cdev *cdev; /* character device, which video device register */
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//struct file_operations *cdev_ops;/* file_operations in origonal cdev */
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struct v4l2_device *v4l2_dev; /* v4l2_device parent */
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/* Only set parent if that can't be deduced from v4l2_dev */
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//struct device *dev_parent; /* device parent */
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/* Control handler associated with this device node. May be NULL.
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* look up v4l2_ctrls.h for more detail */
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struct v4l2_ctrl_handler *ctrl_handler;
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/* vb2_queue associated with this device node. May be NULL. */
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struct vb2_queue *queue;
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/* Priority state. If NULL, then v4l2_dev->prio will be used. */
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struct v4l2_prio_state *prio;
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/* device info */
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char name[32];
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int vfl_type; /* device type,usally assign the define VFL_TYPE_XXX value */
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int vfl_dir; /* receiver, transmitter or m2m,usally assign the define VFL_DIR_XXX value */
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/* 'minor' is set to -1 if the registration failed */
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int minor;
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u16 num; /* record the registered video device node number */
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/* use bitops to set/clear/test flags,usally assign the define VFL_FL_XXX value */
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unsigned long flags;
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/* attribute to differentiate multiple indices on one physical device */
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int index;
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/* V4L2 file handles */
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//spinlock_t fh_lock; /* Lock for all v4l2_fhs */
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_Lock fh_lock;
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struct list_head fh_list; /* List of struct v4l2_fh */
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int debug; /* Activates debug level*/
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/* Video standard vars (v4l2_std_id = u64)*/
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//v4l2_std_id tvnorms; /* Supported tv norms,usally assign the define VFL_STD_XXX value */
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u64 tvnorms;
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/* callbacks,this must non-NULL,in usually use the video_device_release()to replace of */
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void (*release)(struct video_device *vdev);
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/* ioctl callbacks,look up v4l2-ioctl.h for more detail */
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const struct v4l2_ioctl_ops *ioctl_ops;
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//DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE); /* unsigned long valid_ioctls[6] */
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unsigned long valid_ioctls[6];
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/* serialization lock */
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//DECLARE_BITMAP(disable_locking, BASE_VIDIOC_PRIVATE); /* unsigned long disable_locking[6] */
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unsigned long disable_locking[6];
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//struct mutex *lock; /* make serilized ioctl lock possible */
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_Mutex *lock;
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};
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/* todo need to modify */
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#if 0
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#define media_entity_to_video_device(__e) \
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container_of(__e, struct video_device, entity)
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/* dev to video-device */
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#define to_video_device(cd) container_of(cd, struct video_device, dev)
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#endif
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int __video_register_device(struct video_device *vdev, int type,
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int nr, int warn_if_nr_in_use/*, struct module *owner*/);
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/* Register video devices. Note that if video_register_device fails,
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the release() callback of the video_device structure is *not* called, so
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the caller is responsible for freeing any data. Usually that means that
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you call video_device_release() on failure. */
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static inline int video_register_device(struct video_device *vdev,
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int type, int nr)
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{
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// type = VFL_TYPE_GRABBER, nr = -1, 1, "THIS_MODULE"
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return __video_register_device(vdev, type, nr, 1/*, vdev->fops->owner*/);
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}
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/* Same as video_register_device, but no warning is issued if the desired
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device node number was already in use. */
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static inline int video_register_device_no_warn(
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struct video_device *vdev, int type, int nr)
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{
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return __video_register_device(vdev, type, nr, 0/*, vdev->fops->owner*/);
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}
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/* Unregister video devices. Will do nothing if vdev == NULL or
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video_is_registered() returns false. */
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void video_unregister_device(struct video_device *vdev);
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/* helper functions to alloc/release struct video_device, the
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latter can also be used for video_device->release(). */
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struct video_device *video_device_alloc(void);
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/* this release function frees the vdev pointer */
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void video_device_release(struct video_device *vdev);
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/* this release function does nothing, use when the video_device is a
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static global struct. Note that having a static video_device is
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a dubious construction at best. */
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void video_device_release_empty(struct video_device *vdev);
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/* returns true if cmd is a known V4L2 ioctl */
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bool v4l2_is_known_ioctl(unsigned int cmd);
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/* mark that this command shouldn't use core locking */
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static inline void v4l2_disable_ioctl_locking(struct video_device *vdev, unsigned int cmd)
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{
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#define BASE_VIDIOC_PRIVATE 192
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if (_IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
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set_bit(_IOC_NR(cmd), vdev->disable_locking);
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}
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/* Mark that this command isn't implemented. This must be called before
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video_device_register. See also the comments in determine_valid_ioctls().
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This function allows drivers to provide just one v4l2_ioctl_ops struct, but
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disable ioctls based on the specific card that is actually found. */
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static inline void v4l2_disable_ioctl(struct video_device *vdev, unsigned int cmd)
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{
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#define BASE_VIDIOC_PRIVATE 192
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if (_IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
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set_bit(_IOC_NR(cmd), vdev->valid_ioctls);
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}
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/* helper functions to access driver private data. */
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static inline void *video_get_drvdata(struct video_device *vdev)
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{
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//return dev_get_drvdata(&vdev->dev);
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return (vdev->dev_driver_data);
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}
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static inline void video_set_drvdata(struct video_device *vdev, void *data)
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{
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//dev_set_drvdata(&vdev->dev, data);
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vdev->dev_driver_data = data;
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}
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struct video_device *video_devdata();
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/* Combine video_get_drvdata and video_devdata as this is
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used very often. */
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static inline void *video_drvdata()
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{
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return video_get_drvdata(video_devdata());
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}
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static inline const char *video_device_node_name(struct video_device *vdev)
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{
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//return dev_name(&vdev->dev);
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return (vdev->init_name);
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}
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static inline int video_is_registered(struct video_device *vdev)
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{
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return test_bit(V4L2_FL_REGISTERED, &vdev->flags);
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}
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#endif /* _V4L2_DEV_H */
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