include/media/v4l2-dev.h

   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 #define OBSOLETE_OWNER 1 /* to be removed soon */
  13
  14 #include <linux/poll.h>
  15 #include <linux/fs.h>
  16 #include <linux/device.h>
  17 #include <linux/mutex.h>
  18 #include <linux/compiler.h> /* need __user */
  19 #ifdef CONFIG_VIDEO_V4L1_COMPAT
  20 #include <linux/videodev.h>
  21 #else
  22 #include <linux/videodev2.h>
  23 #endif
  24
  25 #include <linux/fs.h>
  26
  27 #define VIDEO_MAJOR     81
  28 /* Minor device allocation */
  29 #define MINOR_VFL_TYPE_GRABBER_MIN   0
  30 #define MINOR_VFL_TYPE_GRABBER_MAX  63
  31 #define MINOR_VFL_TYPE_RADIO_MIN    64
  32 #define MINOR_VFL_TYPE_RADIO_MAX   127
  33 #define MINOR_VFL_TYPE_VTX_MIN     192
  34 #define MINOR_VFL_TYPE_VTX_MAX     223
  35 #define MINOR_VFL_TYPE_VBI_MIN     224
  36 #define MINOR_VFL_TYPE_VBI_MAX     255
  37
  38 #define VFL_TYPE_GRABBER        0
  39 #define VFL_TYPE_VBI            1
  40 #define VFL_TYPE_RADIO          2
  41 #define VFL_TYPE_VTX            3
  42
  43 /*  Video standard functions  */
  44 extern unsigned int v4l2_video_std_fps(struct v4l2_standard *vs);
  45 extern int v4l2_video_std_construct(struct v4l2_standard *vs,
  46                                     int id, char *name);
  47
  48 /* prority handling */
  49 struct v4l2_prio_state {
  50         atomic_t prios[4];
  51 };
  52 int v4l2_prio_init(struct v4l2_prio_state *global);
  53 int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
  54                      enum v4l2_priority new);
  55 int v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
  56 int v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority *local);
  57 enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
  58 int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority *local);
  59
  60 /* names for fancy debug output */
  61 extern char *v4l2_field_names[];
  62 extern char *v4l2_type_names[];
  63
  64 /*  Compatibility layer interface  --  v4l1-compat module */
  65 typedef int (*v4l2_kioctl)(struct inode *inode, struct file *file,
  66                            unsigned int cmd, void *arg);
  67 #ifdef CONFIG_VIDEO_V4L1_COMPAT
  68 int v4l_compat_translate_ioctl(struct inode *inode, struct file *file,
  69                                int cmd, void *arg, v4l2_kioctl driver_ioctl);
  70 #else
  71 #define v4l_compat_translate_ioctl(inode,file,cmd,arg,ioctl) -EINVAL
  72 #endif
  73
  74 /* 32 Bits compatibility layer for 64 bits processors */
  75 extern long v4l_compat_ioctl32(struct file *file, unsigned int cmd,
  76                                 unsigned long arg);
  77
  78 /*
  79  * Newer version of video_device, handled by videodev2.c
  80  *      This version moves redundant code from video device code to
  81  *      the common handler
  82  */
  83 struct v4l2_tvnorm {
  84         char          *name;
  85         v4l2_std_id   id;
  86
  87         void          *priv_data;
  88 };
  89
  90 struct video_device
  91 {
  92         /* device ops */
  93         const struct file_operations *fops;
  94
  95         /* device info */
  96         struct device *dev;
  97         char name[32];
  98         int type;       /* v4l1 */
  99         int type2;      /* v4l2 */
 100         int hardware;
 101         int minor;
 102
 103         int debug;      /* Activates debug level*/
 104
 105         /* Video standard vars */
 106         int tvnormsize; /* Size of tvnorm array */
 107         v4l2_std_id current_norm; /* Current tvnorm */
 108         struct v4l2_tvnorm *tvnorms;
 109
 110         /* callbacks */
 111         void (*release)(struct video_device *vfd);
 112
 113         /* ioctl callbacks */
 114
 115         /* VIDIOC_QUERYCAP handler */
 116         int (*vidioc_querycap)(struct file *file, void *fh, struct v4l2_capability *cap);
 117
 118         /* Priority handling */
 119         int (*vidioc_g_priority)   (struct file *file, void *fh,
 120                                     enum v4l2_priority *p);
 121         int (*vidioc_s_priority)   (struct file *file, void *fh,
 122                                     enum v4l2_priority p);
 123
 124         /* VIDIOC_ENUM_FMT handlers */
 125         int (*vidioc_enum_fmt_cap)         (struct file *file, void *fh,
 126                                             struct v4l2_fmtdesc *f);
 127         int (*vidioc_enum_fmt_overlay)     (struct file *file, void *fh,
 128                                             struct v4l2_fmtdesc *f);
 129         int (*vidioc_enum_fmt_vbi)         (struct file *file, void *fh,
 130                                             struct v4l2_fmtdesc *f);
 131         int (*vidioc_enum_fmt_vbi_capture) (struct file *file, void *fh,
 132                                             struct v4l2_fmtdesc *f);
 133         int (*vidioc_enum_fmt_video_output)(struct file *file, void *fh,
 134                                             struct v4l2_fmtdesc *f);
 135         int (*vidioc_enum_fmt_vbi_output)  (struct file *file, void *fh,
 136                                             struct v4l2_fmtdesc *f);
 137         int (*vidioc_enum_fmt_type_private)(struct file *file, void *fh,
 138                                             struct v4l2_fmtdesc *f);
 139
 140         /* VIDIOC_G_FMT handlers */
 141         int (*vidioc_g_fmt_cap)        (struct file *file, void *fh,
 142                                         struct v4l2_format *f);
 143         int (*vidioc_g_fmt_overlay)    (struct file *file, void *fh,
 144                                         struct v4l2_format *f);
 145         int (*vidioc_g_fmt_vbi)        (struct file *file, void *fh,
 146                                         struct v4l2_format *f);
 147         int (*vidioc_g_fmt_vbi_output) (struct file *file, void *fh,
 148                                         struct v4l2_format *f);
 149         int (*vidioc_g_fmt_vbi_capture)(struct file *file, void *fh,
 150                                         struct v4l2_format *f);
 151         int (*vidioc_g_fmt_video_output)(struct file *file, void *fh,
 152                                         struct v4l2_format *f);
 153         int (*vidioc_g_fmt_type_private)(struct file *file, void *fh,
 154                                         struct v4l2_format *f);
 155
 156         /* VIDIOC_S_FMT handlers */
 157         int (*vidioc_s_fmt_cap)        (struct file *file, void *fh,
 158                                         struct v4l2_format *f);
 159
 160         int (*vidioc_s_fmt_overlay)    (struct file *file, void *fh,
 161                                         struct v4l2_format *f);
 162         int (*vidioc_s_fmt_vbi)        (struct file *file, void *fh,
 163                                         struct v4l2_format *f);
 164         int (*vidioc_s_fmt_vbi_output) (struct file *file, void *fh,
 165                                         struct v4l2_format *f);
 166         int (*vidioc_s_fmt_vbi_capture)(struct file *file, void *fh,
 167                                         struct v4l2_format *f);
 168         int (*vidioc_s_fmt_video_output)(struct file *file, void *fh,
 169                                         struct v4l2_format *f);
 170         int (*vidioc_s_fmt_type_private)(struct file *file, void *fh,
 171                                         struct v4l2_format *f);
 172
 173         /* VIDIOC_TRY_FMT handlers */
 174         int (*vidioc_try_fmt_cap)        (struct file *file, void *fh,
 175                                           struct v4l2_format *f);
 176         int (*vidioc_try_fmt_overlay)    (struct file *file, void *fh,
 177                                           struct v4l2_format *f);
 178         int (*vidioc_try_fmt_vbi)        (struct file *file, void *fh,
 179                                           struct v4l2_format *f);
 180         int (*vidioc_try_fmt_vbi_output) (struct file *file, void *fh,
 181                                           struct v4l2_format *f);
 182         int (*vidioc_try_fmt_vbi_capture)(struct file *file, void *fh,
 183                                           struct v4l2_format *f);
 184         int (*vidioc_try_fmt_video_output)(struct file *file, void *fh,
 185                                           struct v4l2_format *f);
 186         int (*vidioc_try_fmt_type_private)(struct file *file, void *fh,
 187                                           struct v4l2_format *f);
 188
 189         /* Buffer handlers */
 190         int (*vidioc_reqbufs) (struct file *file, void *fh, struct v4l2_requestbuffers *b);
 191         int (*vidioc_querybuf)(struct file *file, void *fh, struct v4l2_buffer *b);
 192         int (*vidioc_qbuf)    (struct file *file, void *fh, struct v4l2_buffer *b);
 193         int (*vidioc_dqbuf)   (struct file *file, void *fh, struct v4l2_buffer *b);
 194
 195
 196         int (*vidioc_overlay) (struct file *file, void *fh, unsigned int i);
 197 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 198                         /* buffer type is struct vidio_mbuf * */
 199         int (*vidiocgmbuf)  (struct file *file, void *fh, struct video_mbuf *p);
 200 #endif
 201         int (*vidioc_g_fbuf)   (struct file *file, void *fh,
 202                                 struct v4l2_framebuffer *a);
 203         int (*vidioc_s_fbuf)   (struct file *file, void *fh,
 204                                 struct v4l2_framebuffer *a);
 205
 206                 /* Stream on/off */
 207         int (*vidioc_streamon) (struct file *file, void *fh, enum v4l2_buf_type i);
 208         int (*vidioc_streamoff)(struct file *file, void *fh, enum v4l2_buf_type i);
 209
 210                 /* Standard handling
 211                         G_STD and ENUMSTD are handled by videodev.c
 212                  */
 213         int (*vidioc_s_std)    (struct file *file, void *fh, v4l2_std_id a);
 214         int (*vidioc_querystd) (struct file *file, void *fh, v4l2_std_id *a);
 215
 216                 /* Input handling */
 217         int (*vidioc_enum_input)(struct file *file, void *fh,
 218                                  struct v4l2_input *inp);
 219         int (*vidioc_g_input)   (struct file *file, void *fh, unsigned int *i);
 220         int (*vidioc_s_input)   (struct file *file, void *fh, unsigned int i);
 221
 222                 /* Output handling */
 223         int (*vidioc_enumoutput) (struct file *file, void *fh,
 224                                   struct v4l2_output *a);
 225         int (*vidioc_g_output)   (struct file *file, void *fh, unsigned int *i);
 226         int (*vidioc_s_output)   (struct file *file, void *fh, unsigned int i);
 227
 228                 /* Control handling */
 229         int (*vidioc_queryctrl)        (struct file *file, void *fh,
 230                                         struct v4l2_queryctrl *a);
 231         int (*vidioc_g_ctrl)           (struct file *file, void *fh,
 232                                         struct v4l2_control *a);
 233         int (*vidioc_s_ctrl)           (struct file *file, void *fh,
 234                                         struct v4l2_control *a);
 235         int (*vidioc_g_ext_ctrls)      (struct file *file, void *fh,
 236                                         struct v4l2_ext_controls *a);
 237         int (*vidioc_s_ext_ctrls)      (struct file *file, void *fh,
 238                                         struct v4l2_ext_controls *a);
 239         int (*vidioc_try_ext_ctrls)    (struct file *file, void *fh,
 240                                         struct v4l2_ext_controls *a);
 241         int (*vidioc_querymenu)        (struct file *file, void *fh,
 242                                         struct v4l2_querymenu *a);
 243
 244         /* Audio ioctls */
 245         int (*vidioc_enumaudio)        (struct file *file, void *fh,
 246                                         struct v4l2_audio *a);
 247         int (*vidioc_g_audio)          (struct file *file, void *fh,
 248                                         struct v4l2_audio *a);
 249         int (*vidioc_s_audio)          (struct file *file, void *fh,
 250                                         struct v4l2_audio *a);
 251
 252         /* Audio out ioctls */
 253         int (*vidioc_enumaudout)       (struct file *file, void *fh,
 254                                         struct v4l2_audioout *a);
 255         int (*vidioc_g_audout)         (struct file *file, void *fh,
 256                                         struct v4l2_audioout *a);
 257         int (*vidioc_s_audout)         (struct file *file, void *fh,
 258                                         struct v4l2_audioout *a);
 259         int (*vidioc_g_modulator)      (struct file *file, void *fh,
 260                                         struct v4l2_modulator *a);
 261         int (*vidioc_s_modulator)      (struct file *file, void *fh,
 262                                         struct v4l2_modulator *a);
 263         /* Crop ioctls */
 264         int (*vidioc_cropcap)          (struct file *file, void *fh,
 265                                         struct v4l2_cropcap *a);
 266         int (*vidioc_g_crop)           (struct file *file, void *fh,
 267                                         struct v4l2_crop *a);
 268         int (*vidioc_s_crop)           (struct file *file, void *fh,
 269                                         struct v4l2_crop *a);
 270         /* Compression ioctls */
 271         int (*vidioc_g_mpegcomp)       (struct file *file, void *fh,
 272                                         struct v4l2_mpeg_compression *a);
 273         int (*vidioc_s_mpegcomp)       (struct file *file, void *fh,
 274                                         struct v4l2_mpeg_compression *a);
 275         int (*vidioc_g_jpegcomp)       (struct file *file, void *fh,
 276                                         struct v4l2_jpegcompression *a);
 277         int (*vidioc_s_jpegcomp)       (struct file *file, void *fh,
 278                                         struct v4l2_jpegcompression *a);
 279
 280         /* Stream type-dependent parameter ioctls */
 281         int (*vidioc_g_parm)           (struct file *file, void *fh,
 282                                         struct v4l2_streamparm *a);
 283         int (*vidioc_s_parm)           (struct file *file, void *fh,
 284                                         struct v4l2_streamparm *a);
 285
 286         /* Tuner ioctls */
 287         int (*vidioc_g_tuner)          (struct file *file, void *fh,
 288                                         struct v4l2_tuner *a);
 289         int (*vidioc_s_tuner)          (struct file *file, void *fh,
 290                                         struct v4l2_tuner *a);
 291         int (*vidioc_g_frequency)      (struct file *file, void *fh,
 292                                         struct v4l2_frequency *a);
 293         int (*vidioc_s_frequency)      (struct file *file, void *fh,
 294                                         struct v4l2_frequency *a);
 295
 296         /* Sliced VBI cap */
 297         int (*vidioc_g_sliced_vbi_cap) (struct file *file, void *fh,
 298                                         struct v4l2_sliced_vbi_cap *a);
 299
 300         /* Log status ioctl */
 301         int (*vidioc_log_status)       (struct file *file, void *fh);
 302
 303
 304 #ifdef OBSOLETE_OWNER /* to be removed soon */
 305 /* obsolete -- fops->owner is used instead */
 306 struct module *owner;
 307 /* dev->driver_data will be used instead some day.
 308         * Use the video_{get|set}_drvdata() helper functions,
 309         * so the switch over will be transparent for you.
 310         * Or use {pci|usb}_{get|set}_drvdata() directly. */
 311 void *priv;
 312 #endif
 313
 314         /* for videodev.c intenal usage -- please don't touch */
 315         int users;                     /* video_exclusive_{open|close} ... */
 316         struct mutex lock;             /* ... helper function uses these   */
 317         struct class_device class_dev; /* sysfs */
 318 };
 319
 320 /* Version 2 functions */
 321 extern int video_register_device(struct video_device *vfd, int type, int nr);
 322 void video_unregister_device(struct video_device *);
 323 extern int video_ioctl2(struct inode *inode, struct file *file,
 324                           unsigned int cmd, unsigned long arg);
 325
 326 /* helper functions to alloc / release struct video_device, the
 327    later can be used for video_device->release() */
 328 struct video_device *video_device_alloc(void);
 329 void video_device_release(struct video_device *vfd);
 330
 331 /* Include support for obsoleted stuff */
 332 extern int video_usercopy(struct inode *inode, struct file *file,
 333                           unsigned int cmd, unsigned long arg,
 334                           int (*func)(struct inode *inode, struct file *file,
 335                                       unsigned int cmd, void *arg));
 336
 337
 338 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 339 #include <linux/mm.h>
 340
 341 extern struct video_device* video_devdata(struct file*);
 342
 343 #define to_video_device(cd) container_of(cd, struct video_device, class_dev)
 344 static inline int
 345 video_device_create_file(struct video_device *vfd,
 346                          struct class_device_attribute *attr)
 347 {
 348         int ret = class_device_create_file(&vfd->class_dev, attr);
 349         if (ret < 0)
 350                 printk(KERN_WARNING "%s error: %d\n", __FUNCTION__, ret);
 351         return ret;
 352 }
 353 static inline void
 354 video_device_remove_file(struct video_device *vfd,
 355                          struct class_device_attribute *attr)
 356 {
 357         class_device_remove_file(&vfd->class_dev, attr);
 358 }
 359
 360 #endif /* CONFIG_VIDEO_V4L1_COMPAT */
 361
 362 #ifdef OBSOLETE_OWNER /* to be removed soon */
 363 /* helper functions to access driver private data. */
 364 static inline void *video_get_drvdata(struct video_device *dev)
 365 {
 366         return dev->priv;
 367 }
 368
 369 static inline void video_set_drvdata(struct video_device *dev, void *data)
 370 {
 371         dev->priv = data;
 372 }
 373 #endif
 374
 375 extern int video_exclusive_open(struct inode *inode, struct file *file);
 376 extern int video_exclusive_release(struct inode *inode, struct file *file);
 377
 378 #endif /* _V4L2_DEV_H */