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TOMOYO Linux Cross Reference
Linux/include/media/v4l2-dev.h

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  1 /*
  2  *
  3  *      V 4 L 2   D R I V E R   H E L P E R   A P I
  4  *
  5  * Moved from videodev2.h
  6  *
  7  *      Some commonly needed functions for drivers (v4l2-common.o module)
  8  */
  9 #ifndef _V4L2_DEV_H
 10 #define _V4L2_DEV_H
 11 
 12 #include <linux/poll.h>
 13 #include <linux/fs.h>
 14 #include <linux/device.h>
 15 #include <linux/cdev.h>
 16 #include <linux/mutex.h>
 17 #include <linux/videodev2.h>
 18 
 19 #include <media/media-entity.h>
 20 
 21 #define VIDEO_MAJOR     81
 22 
 23 #define VFL_TYPE_GRABBER        0
 24 #define VFL_TYPE_VBI            1
 25 #define VFL_TYPE_RADIO          2
 26 #define VFL_TYPE_SUBDEV         3
 27 #define VFL_TYPE_MAX            4
 28 
 29 /* Is this a receiver, transmitter or mem-to-mem? */
 30 /* Ignored for VFL_TYPE_SUBDEV. */
 31 #define VFL_DIR_RX              0
 32 #define VFL_DIR_TX              1
 33 #define VFL_DIR_M2M             2
 34 
 35 struct v4l2_ioctl_callbacks;
 36 struct video_device;
 37 struct v4l2_device;
 38 struct v4l2_ctrl_handler;
 39 
 40 /* Flag to mark the video_device struct as registered.
 41    Drivers can clear this flag if they want to block all future
 42    device access. It is cleared by video_unregister_device. */
 43 #define V4L2_FL_REGISTERED      (0)
 44 /* file->private_data points to struct v4l2_fh */
 45 #define V4L2_FL_USES_V4L2_FH    (1)
 46 /* Use the prio field of v4l2_fh for core priority checking */
 47 #define V4L2_FL_USE_FH_PRIO     (2)
 48 
 49 /* Priority helper functions */
 50 
 51 struct v4l2_prio_state {
 52         atomic_t prios[4];
 53 };
 54 
 55 void v4l2_prio_init(struct v4l2_prio_state *global);
 56 int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
 57                      enum v4l2_priority new);
 58 void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
 59 void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local);
 60 enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
 61 int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local);
 62 
 63 
 64 struct v4l2_file_operations {
 65         struct module *owner;
 66         ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
 67         ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
 68         unsigned int (*poll) (struct file *, struct poll_table_struct *);
 69         long (*ioctl) (struct file *, unsigned int, unsigned long);
 70         long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
 71 #ifdef CONFIG_COMPAT
 72         long (*compat_ioctl32) (struct file *, unsigned int, unsigned long);
 73 #endif
 74         unsigned long (*get_unmapped_area) (struct file *, unsigned long,
 75                                 unsigned long, unsigned long, unsigned long);
 76         int (*mmap) (struct file *, struct vm_area_struct *);
 77         int (*open) (struct file *);
 78         int (*release) (struct file *);
 79 };
 80 
 81 /*
 82  * Newer version of video_device, handled by videodev2.c
 83  *      This version moves redundant code from video device code to
 84  *      the common handler
 85  */
 86 
 87 struct video_device
 88 {
 89 #if defined(CONFIG_MEDIA_CONTROLLER)
 90         struct media_entity entity;
 91 #endif
 92         /* device ops */
 93         const struct v4l2_file_operations *fops;
 94 
 95         /* sysfs */
 96         struct device dev;              /* v4l device */
 97         struct cdev *cdev;              /* character device */
 98 
 99         /* Set either parent or v4l2_dev if your driver uses v4l2_device */
100         struct device *parent;          /* device parent */
101         struct v4l2_device *v4l2_dev;   /* v4l2_device parent */
102 
103         /* Control handler associated with this device node. May be NULL. */
104         struct v4l2_ctrl_handler *ctrl_handler;
105 
106         /* vb2_queue associated with this device node. May be NULL. */
107         struct vb2_queue *queue;
108 
109         /* Priority state. If NULL, then v4l2_dev->prio will be used. */
110         struct v4l2_prio_state *prio;
111 
112         /* device info */
113         char name[32];
114         int vfl_type;   /* device type */
115         int vfl_dir;    /* receiver, transmitter or m2m */
116         /* 'minor' is set to -1 if the registration failed */
117         int minor;
118         u16 num;
119         /* use bitops to set/clear/test flags */
120         unsigned long flags;
121         /* attribute to differentiate multiple indices on one physical device */
122         int index;
123 
124         /* V4L2 file handles */
125         spinlock_t              fh_lock; /* Lock for all v4l2_fhs */
126         struct list_head        fh_list; /* List of struct v4l2_fh */
127 
128         int debug;                      /* Activates debug level*/
129 
130         /* Video standard vars */
131         v4l2_std_id tvnorms;            /* Supported tv norms */
132         v4l2_std_id current_norm;       /* Current tvnorm */
133 
134         /* callbacks */
135         void (*release)(struct video_device *vdev);
136 
137         /* ioctl callbacks */
138         const struct v4l2_ioctl_ops *ioctl_ops;
139         DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE);
140 
141         /* serialization lock */
142         DECLARE_BITMAP(disable_locking, BASE_VIDIOC_PRIVATE);
143         struct mutex *lock;
144 };
145 
146 #define media_entity_to_video_device(__e) \
147         container_of(__e, struct video_device, entity)
148 /* dev to video-device */
149 #define to_video_device(cd) container_of(cd, struct video_device, dev)
150 
151 int __must_check __video_register_device(struct video_device *vdev, int type,
152                 int nr, int warn_if_nr_in_use, struct module *owner);
153 
154 /* Register video devices. Note that if video_register_device fails,
155    the release() callback of the video_device structure is *not* called, so
156    the caller is responsible for freeing any data. Usually that means that
157    you call video_device_release() on failure. */
158 static inline int __must_check video_register_device(struct video_device *vdev,
159                 int type, int nr)
160 {
161         return __video_register_device(vdev, type, nr, 1, vdev->fops->owner);
162 }
163 
164 /* Same as video_register_device, but no warning is issued if the desired
165    device node number was already in use. */
166 static inline int __must_check video_register_device_no_warn(
167                 struct video_device *vdev, int type, int nr)
168 {
169         return __video_register_device(vdev, type, nr, 0, vdev->fops->owner);
170 }
171 
172 /* Unregister video devices. Will do nothing if vdev == NULL or
173    video_is_registered() returns false. */
174 void video_unregister_device(struct video_device *vdev);
175 
176 /* helper functions to alloc/release struct video_device, the
177    latter can also be used for video_device->release(). */
178 struct video_device * __must_check video_device_alloc(void);
179 
180 /* this release function frees the vdev pointer */
181 void video_device_release(struct video_device *vdev);
182 
183 /* this release function does nothing, use when the video_device is a
184    static global struct. Note that having a static video_device is
185    a dubious construction at best. */
186 void video_device_release_empty(struct video_device *vdev);
187 
188 /* returns true if cmd is a known V4L2 ioctl */
189 bool v4l2_is_known_ioctl(unsigned int cmd);
190 
191 /* mark that this command shouldn't use core locking */
192 static inline void v4l2_disable_ioctl_locking(struct video_device *vdev, unsigned int cmd)
193 {
194         if (_IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
195                 set_bit(_IOC_NR(cmd), vdev->disable_locking);
196 }
197 
198 /* Mark that this command isn't implemented. This must be called before
199    video_device_register. See also the comments in determine_valid_ioctls().
200    This function allows drivers to provide just one v4l2_ioctl_ops struct, but
201    disable ioctls based on the specific card that is actually found. */
202 static inline void v4l2_disable_ioctl(struct video_device *vdev, unsigned int cmd)
203 {
204         if (_IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
205                 set_bit(_IOC_NR(cmd), vdev->valid_ioctls);
206 }
207 
208 /* helper functions to access driver private data. */
209 static inline void *video_get_drvdata(struct video_device *vdev)
210 {
211         return dev_get_drvdata(&vdev->dev);
212 }
213 
214 static inline void video_set_drvdata(struct video_device *vdev, void *data)
215 {
216         dev_set_drvdata(&vdev->dev, data);
217 }
218 
219 struct video_device *video_devdata(struct file *file);
220 
221 /* Combine video_get_drvdata and video_devdata as this is
222    used very often. */
223 static inline void *video_drvdata(struct file *file)
224 {
225         return video_get_drvdata(video_devdata(file));
226 }
227 
228 static inline const char *video_device_node_name(struct video_device *vdev)
229 {
230         return dev_name(&vdev->dev);
231 }
232 
233 static inline int video_is_registered(struct video_device *vdev)
234 {
235         return test_bit(V4L2_FL_REGISTERED, &vdev->flags);
236 }
237 
238 #endif /* _V4L2_DEV_H */
239 

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