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

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