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 #define OBSOLETE_DEVDATA 1 /* to be removed soon */
  14
  15 #include <linux/poll.h>
  16 #include <linux/fs.h>
  17 #include <linux/device.h>
  18 #include <linux/mutex.h>
  19 #include <linux/compiler.h> /* need __user */
  20 #ifdef CONFIG_VIDEO_V4L1_COMPAT
  21 #include <linux/videodev.h>
  22 #else
  23 #include <linux/videodev2.h>
  24 #endif
  25
  26 #define VIDEO_MAJOR     81
  27 /* Minor device allocation */
  28 #define MINOR_VFL_TYPE_GRABBER_MIN   0
  29 #define MINOR_VFL_TYPE_GRABBER_MAX  63
  30 #define MINOR_VFL_TYPE_RADIO_MIN    64
  31 #define MINOR_VFL_TYPE_RADIO_MAX   127
  32 #define MINOR_VFL_TYPE_VTX_MIN     192
  33 #define MINOR_VFL_TYPE_VTX_MAX     223
  34 #define MINOR_VFL_TYPE_VBI_MIN     224
  35 #define MINOR_VFL_TYPE_VBI_MAX     255
  36
  37 #define VFL_TYPE_GRABBER        0
  38 #define VFL_TYPE_VBI            1
  39 #define VFL_TYPE_RADIO          2
  40 #define VFL_TYPE_VTX            3
  41
  42 /*  Video standard functions  */
  43 extern unsigned int v4l2_video_std_fps(struct v4l2_standard *vs);
  44 extern char *v4l2_norm_to_name(v4l2_std_id id);
  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
  84 struct video_device
  85 {
  86         /* device ops */
  87         const struct file_operations *fops;
  88
  89         /* sysfs */
  90         struct device class_dev;        /* v4l device */
  91         struct device *dev;             /* device parent */
  92
  93         /* device info */
  94         char name[32];
  95         int type;       /* v4l1 */
  96         int type2;      /* v4l2 */
  97         int minor;
  98
  99         int debug;      /* Activates debug level*/
 100
 101         /* Video standard vars */
 102         v4l2_std_id tvnorms;            /* Supported tv norms */
 103         v4l2_std_id current_norm;       /* Current tvnorm */
 104
 105         /* callbacks */
 106         void (*release)(struct video_device *vfd);
 107
 108         /* ioctl callbacks */
 109
 110         /* VIDIOC_QUERYCAP handler */
 111         int (*vidioc_querycap)(struct file *file, void *fh, struct v4l2_capability *cap);
 112
 113         /* Priority handling */
 114         int (*vidioc_g_priority)   (struct file *file, void *fh,
 115                                     enum v4l2_priority *p);
 116         int (*vidioc_s_priority)   (struct file *file, void *fh,
 117                                     enum v4l2_priority p);
 118
 119         /* VIDIOC_ENUM_FMT handlers */
 120         int (*vidioc_enum_fmt_cap)         (struct file *file, void *fh,
 121                                             struct v4l2_fmtdesc *f);
 122         int (*vidioc_enum_fmt_overlay)     (struct file *file, void *fh,
 123                                             struct v4l2_fmtdesc *f);
 124         int (*vidioc_enum_fmt_vbi)         (struct file *file, void *fh,
 125                                             struct v4l2_fmtdesc *f);
 126         int (*vidioc_enum_fmt_vbi_capture) (struct file *file, void *fh,
 127                                             struct v4l2_fmtdesc *f);
 128         int (*vidioc_enum_fmt_video_output)(struct file *file, void *fh,
 129                                             struct v4l2_fmtdesc *f);
 130         int (*vidioc_enum_fmt_output_overlay) (struct file *file, void *fh,
 131                                             struct v4l2_fmtdesc *f);
 132         int (*vidioc_enum_fmt_vbi_output)  (struct file *file, void *fh,
 133                                             struct v4l2_fmtdesc *f);
 134         int (*vidioc_enum_fmt_type_private)(struct file *file, void *fh,
 135                                             struct v4l2_fmtdesc *f);
 136
 137         /* VIDIOC_G_FMT handlers */
 138         int (*vidioc_g_fmt_cap)        (struct file *file, void *fh,
 139                                         struct v4l2_format *f);
 140         int (*vidioc_g_fmt_overlay)    (struct file *file, void *fh,
 141                                         struct v4l2_format *f);
 142         int (*vidioc_g_fmt_vbi)        (struct file *file, void *fh,
 143                                         struct v4l2_format *f);
 144         int (*vidioc_g_fmt_vbi_output) (struct file *file, void *fh,
 145                                         struct v4l2_format *f);
 146         int (*vidioc_g_fmt_vbi_capture)(struct file *file, void *fh,
 147                                         struct v4l2_format *f);
 148         int (*vidioc_g_fmt_video_output)(struct file *file, void *fh,
 149                                         struct v4l2_format *f);
 150         int (*vidioc_g_fmt_output_overlay) (struct file *file, void *fh,
 151                                         struct v4l2_format *f);
 152         int (*vidioc_g_fmt_type_private)(struct file *file, void *fh,
 153                                         struct v4l2_format *f);
 154
 155         /* VIDIOC_S_FMT handlers */
 156         int (*vidioc_s_fmt_cap)        (struct file *file, void *fh,
 157                                         struct v4l2_format *f);
 158
 159         int (*vidioc_s_fmt_overlay)    (struct file *file, void *fh,
 160                                         struct v4l2_format *f);
 161         int (*vidioc_s_fmt_vbi)        (struct file *file, void *fh,
 162                                         struct v4l2_format *f);
 163         int (*vidioc_s_fmt_vbi_output) (struct file *file, void *fh,
 164                                         struct v4l2_format *f);
 165         int (*vidioc_s_fmt_vbi_capture)(struct file *file, void *fh,
 166                                         struct v4l2_format *f);
 167         int (*vidioc_s_fmt_video_output)(struct file *file, void *fh,
 168                                         struct v4l2_format *f);
 169         int (*vidioc_s_fmt_output_overlay) (struct file *file, void *fh,
 170                                         struct v4l2_format *f);
 171         int (*vidioc_s_fmt_type_private)(struct file *file, void *fh,
 172                                         struct v4l2_format *f);
 173
 174         /* VIDIOC_TRY_FMT handlers */
 175         int (*vidioc_try_fmt_cap)        (struct file *file, void *fh,
 176                                           struct v4l2_format *f);
 177         int (*vidioc_try_fmt_overlay)    (struct file *file, void *fh,
 178                                           struct v4l2_format *f);
 179         int (*vidioc_try_fmt_vbi)        (struct file *file, void *fh,
 180                                           struct v4l2_format *f);
 181         int (*vidioc_try_fmt_vbi_output) (struct file *file, void *fh,
 182                                           struct v4l2_format *f);
 183         int (*vidioc_try_fmt_vbi_capture)(struct file *file, void *fh,
 184                                           struct v4l2_format *f);
 185         int (*vidioc_try_fmt_video_output)(struct file *file, void *fh,
 186                                           struct v4l2_format *f);
 187         int (*vidioc_try_fmt_output_overlay)(struct file *file, void *fh,
 188                                           struct v4l2_format *f);
 189         int (*vidioc_try_fmt_type_private)(struct file *file, void *fh,
 190                                           struct v4l2_format *f);
 191
 192         /* Buffer handlers */
 193         int (*vidioc_reqbufs) (struct file *file, void *fh, struct v4l2_requestbuffers *b);
 194         int (*vidioc_querybuf)(struct file *file, void *fh, struct v4l2_buffer *b);
 195         int (*vidioc_qbuf)    (struct file *file, void *fh, struct v4l2_buffer *b);
 196         int (*vidioc_dqbuf)   (struct file *file, void *fh, struct v4l2_buffer *b);
 197
 198
 199         int (*vidioc_overlay) (struct file *file, void *fh, unsigned int i);
 200 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 201                         /* buffer type is struct vidio_mbuf * */
 202         int (*vidiocgmbuf)  (struct file *file, void *fh, struct video_mbuf *p);
 203 #endif
 204         int (*vidioc_g_fbuf)   (struct file *file, void *fh,
 205                                 struct v4l2_framebuffer *a);
 206         int (*vidioc_s_fbuf)   (struct file *file, void *fh,
 207                                 struct v4l2_framebuffer *a);
 208
 209                 /* Stream on/off */
 210         int (*vidioc_streamon) (struct file *file, void *fh, enum v4l2_buf_type i);
 211         int (*vidioc_streamoff)(struct file *file, void *fh, enum v4l2_buf_type i);
 212
 213                 /* Standard handling
 214                         G_STD and ENUMSTD are handled by videodev.c
 215                  */
 216         int (*vidioc_s_std) (struct file *file, void *fh, v4l2_std_id *norm);
 217         int (*vidioc_querystd) (struct file *file, void *fh, v4l2_std_id *a);
 218
 219                 /* Input handling */
 220         int (*vidioc_enum_input)(struct file *file, void *fh,
 221                                  struct v4l2_input *inp);
 222         int (*vidioc_g_input)   (struct file *file, void *fh, unsigned int *i);
 223         int (*vidioc_s_input)   (struct file *file, void *fh, unsigned int i);
 224
 225                 /* Output handling */
 226         int (*vidioc_enumoutput) (struct file *file, void *fh,
 227                                   struct v4l2_output *a);
 228         int (*vidioc_g_output)   (struct file *file, void *fh, unsigned int *i);
 229         int (*vidioc_s_output)   (struct file *file, void *fh, unsigned int i);
 230
 231                 /* Control handling */
 232         int (*vidioc_queryctrl)        (struct file *file, void *fh,
 233                                         struct v4l2_queryctrl *a);
 234         int (*vidioc_g_ctrl)           (struct file *file, void *fh,
 235                                         struct v4l2_control *a);
 236         int (*vidioc_s_ctrl)           (struct file *file, void *fh,
 237                                         struct v4l2_control *a);
 238         int (*vidioc_g_ext_ctrls)      (struct file *file, void *fh,
 239                                         struct v4l2_ext_controls *a);
 240         int (*vidioc_s_ext_ctrls)      (struct file *file, void *fh,
 241                                         struct v4l2_ext_controls *a);
 242         int (*vidioc_try_ext_ctrls)    (struct file *file, void *fh,
 243                                         struct v4l2_ext_controls *a);
 244         int (*vidioc_querymenu)        (struct file *file, void *fh,
 245                                         struct v4l2_querymenu *a);
 246
 247         /* Audio ioctls */
 248         int (*vidioc_enumaudio)        (struct file *file, void *fh,
 249                                         struct v4l2_audio *a);
 250         int (*vidioc_g_audio)          (struct file *file, void *fh,
 251                                         struct v4l2_audio *a);
 252         int (*vidioc_s_audio)          (struct file *file, void *fh,
 253                                         struct v4l2_audio *a);
 254
 255         /* Audio out ioctls */
 256         int (*vidioc_enumaudout)       (struct file *file, void *fh,
 257                                         struct v4l2_audioout *a);
 258         int (*vidioc_g_audout)         (struct file *file, void *fh,
 259                                         struct v4l2_audioout *a);
 260         int (*vidioc_s_audout)         (struct file *file, void *fh,
 261                                         struct v4l2_audioout *a);
 262         int (*vidioc_g_modulator)      (struct file *file, void *fh,
 263                                         struct v4l2_modulator *a);
 264         int (*vidioc_s_modulator)      (struct file *file, void *fh,
 265                                         struct v4l2_modulator *a);
 266         /* Crop ioctls */
 267         int (*vidioc_cropcap)          (struct file *file, void *fh,
 268                                         struct v4l2_cropcap *a);
 269         int (*vidioc_g_crop)           (struct file *file, void *fh,
 270                                         struct v4l2_crop *a);
 271         int (*vidioc_s_crop)           (struct file *file, void *fh,
 272                                         struct v4l2_crop *a);
 273         /* Compression ioctls */
 274         int (*vidioc_g_jpegcomp)       (struct file *file, void *fh,
 275                                         struct v4l2_jpegcompression *a);
 276         int (*vidioc_s_jpegcomp)       (struct file *file, void *fh,
 277                                         struct v4l2_jpegcompression *a);
 278         int (*vidioc_g_enc_index)      (struct file *file, void *fh,
 279                                         struct v4l2_enc_idx *a);
 280         int (*vidioc_encoder_cmd)      (struct file *file, void *fh,
 281                                         struct v4l2_encoder_cmd *a);
 282         int (*vidioc_try_encoder_cmd)  (struct file *file, void *fh,
 283                                         struct v4l2_encoder_cmd *a);
 284
 285         /* Stream type-dependent parameter ioctls */
 286         int (*vidioc_g_parm)           (struct file *file, void *fh,
 287                                         struct v4l2_streamparm *a);
 288         int (*vidioc_s_parm)           (struct file *file, void *fh,
 289                                         struct v4l2_streamparm *a);
 290
 291         /* Tuner ioctls */
 292         int (*vidioc_g_tuner)          (struct file *file, void *fh,
 293                                         struct v4l2_tuner *a);
 294         int (*vidioc_s_tuner)          (struct file *file, void *fh,
 295                                         struct v4l2_tuner *a);
 296         int (*vidioc_g_frequency)      (struct file *file, void *fh,
 297                                         struct v4l2_frequency *a);
 298         int (*vidioc_s_frequency)      (struct file *file, void *fh,
 299                                         struct v4l2_frequency *a);
 300
 301         /* Sliced VBI cap */
 302         int (*vidioc_g_sliced_vbi_cap) (struct file *file, void *fh,
 303                                         struct v4l2_sliced_vbi_cap *a);
 304
 305         /* Log status ioctl */
 306         int (*vidioc_log_status)       (struct file *file, void *fh);
 307
 308
 309         /* Debugging ioctls */
 310 #ifdef CONFIG_VIDEO_ADV_DEBUG
 311         int (*vidioc_g_register)       (struct file *file, void *fh,
 312                                         struct v4l2_register *reg);
 313         int (*vidioc_s_register)       (struct file *file, void *fh,
 314                                         struct v4l2_register *reg);
 315 #endif
 316         int (*vidioc_g_chip_ident)     (struct file *file, void *fh,
 317                                         struct v4l2_chip_ident *chip);
 318
 319
 320 #ifdef OBSOLETE_OWNER /* to be removed soon */
 321 /* obsolete -- fops->owner is used instead */
 322 struct module *owner;
 323 /* dev->driver_data will be used instead some day.
 324         * Use the video_{get|set}_drvdata() helper functions,
 325         * so the switch over will be transparent for you.
 326         * Or use {pci|usb}_{get|set}_drvdata() directly. */
 327 void *priv;
 328 #endif
 329
 330         /* for videodev.c intenal usage -- please don't touch */
 331         int users;                     /* video_exclusive_{open|close} ... */
 332         struct mutex lock;             /* ... helper function uses these   */
 333 };
 334
 335 /* Class-dev to video-device */
 336 #define to_video_device(cd) container_of(cd, struct video_device, class_dev)
 337
 338 /* Version 2 functions */
 339 extern int video_register_device(struct video_device *vfd, int type, int nr);
 340 void video_unregister_device(struct video_device *);
 341 extern int video_ioctl2(struct inode *inode, struct file *file,
 342                           unsigned int cmd, unsigned long arg);
 343
 344 /* helper functions to alloc / release struct video_device, the
 345    later can be used for video_device->release() */
 346 struct video_device *video_device_alloc(void);
 347 void video_device_release(struct video_device *vfd);
 348
 349 /* Include support for obsoleted stuff */
 350 extern int video_usercopy(struct inode *inode, struct file *file,
 351                           unsigned int cmd, unsigned long arg,
 352                           int (*func)(struct inode *inode, struct file *file,
 353                                       unsigned int cmd, void *arg));
 354
 355 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 356 #include <linux/mm.h>
 357
 358 static inline int __must_check
 359 video_device_create_file(struct video_device *vfd,
 360                          struct device_attribute *attr)
 361 {
 362         int ret = device_create_file(&vfd->class_dev, attr);
 363         if (ret < 0)
 364                 printk(KERN_WARNING "%s error: %d\n", __FUNCTION__, ret);
 365         return ret;
 366 }
 367 static inline void
 368 video_device_remove_file(struct video_device *vfd,
 369                          struct device_attribute *attr)
 370 {
 371         device_remove_file(&vfd->class_dev, attr);
 372 }
 373
 374 #endif /* CONFIG_VIDEO_V4L1_COMPAT */
 375
 376 #ifdef OBSOLETE_OWNER /* to be removed soon */
 377 /* helper functions to access driver private data. */
 378 static inline void *video_get_drvdata(struct video_device *dev)
 379 {
 380         return dev->priv;
 381 }
 382
 383 static inline void video_set_drvdata(struct video_device *dev, void *data)
 384 {
 385         dev->priv = data;
 386 }
 387
 388 #endif
 389
 390 #ifdef OBSOLETE_DEVDATA /* to be removed soon */
 391 /* Obsolete stuff - Still needed for radio devices and obsolete drivers */
 392 extern struct video_device* video_devdata(struct file*);
 393 extern int video_exclusive_open(struct inode *inode, struct file *file);
 394 extern int video_exclusive_release(struct inode *inode, struct file *file);
 395 #endif
 396
 397 #endif /* _V4L2_DEV_H */