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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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