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 const char *v4l2_norm_to_name(v4l2_std_id id);
  44 extern int v4l2_video_std_construct(struct v4l2_standard *vs,
  45                                     int id, const char *name);
  46 /* Prints the ioctl in a human-readable format */
  47 extern void v4l_printk_ioctl(unsigned int cmd);
  48
  49 /* prority handling */
  50 struct v4l2_prio_state {
  51         atomic_t prios[4];
  52 };
  53 int v4l2_prio_init(struct v4l2_prio_state *global);
  54 int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
  55                      enum v4l2_priority new);
  56 int v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
  57 int v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority *local);
  58 enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
  59 int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority *local);
  60
  61 /* names for fancy debug output */
  62 extern const char *v4l2_field_names[];
  63 extern const char *v4l2_type_names[];
  64
  65 /*  Compatibility layer interface  --  v4l1-compat module */
  66 typedef int (*v4l2_kioctl)(struct inode *inode, struct file *file,
  67                            unsigned int cmd, void *arg);
  68 #ifdef CONFIG_VIDEO_V4L1_COMPAT
  69 int v4l_compat_translate_ioctl(struct inode *inode, struct file *file,
  70                                int cmd, void *arg, v4l2_kioctl driver_ioctl);
  71 #else
  72 #define v4l_compat_translate_ioctl(inode,file,cmd,arg,ioctl) -EINVAL
  73 #endif
  74
  75 /* 32 Bits compatibility layer for 64 bits processors */
  76 extern long v4l_compat_ioctl32(struct file *file, unsigned int cmd,
  77                                 unsigned long arg);
  78
  79 /*
  80  * Newer version of video_device, handled by videodev2.c
  81  *      This version moves redundant code from video device code to
  82  *      the common handler
  83  */
  84
  85 struct video_device
  86 {
  87         /* device ops */
  88         const struct file_operations *fops;
  89
  90         /* sysfs */
  91         struct device class_dev;        /* v4l device */
  92         struct device *dev;             /* device parent */
  93
  94         /* device info */
  95         char name[32];
  96         int type;       /* v4l1 */
  97         int type2;      /* v4l2 */
  98         int minor;
  99         /* attribute to diferentiate multiple indexs on one physical device */
 100         int index;
 101
 102         int debug;      /* Activates debug level*/
 103
 104         /* Video standard vars */
 105         v4l2_std_id tvnorms;            /* Supported tv norms */
 106         v4l2_std_id current_norm;       /* Current tvnorm */
 107
 108         /* callbacks */
 109         void (*release)(struct video_device *vfd);
 110
 111         /* ioctl callbacks */
 112
 113         /* VIDIOC_QUERYCAP handler */
 114         int (*vidioc_querycap)(struct file *file, void *fh, struct v4l2_capability *cap);
 115
 116         /* Priority handling */
 117         int (*vidioc_g_priority)   (struct file *file, void *fh,
 118                                     enum v4l2_priority *p);
 119         int (*vidioc_s_priority)   (struct file *file, void *fh,
 120                                     enum v4l2_priority p);
 121
 122         /* VIDIOC_ENUM_FMT handlers */
 123         int (*vidioc_enum_fmt_vid_cap)     (struct file *file, void *fh,
 124                                             struct v4l2_fmtdesc *f);
 125         int (*vidioc_enum_fmt_vid_overlay) (struct file *file, void *fh,
 126                                             struct v4l2_fmtdesc *f);
 127         int (*vidioc_enum_fmt_vid_out)     (struct file *file, void *fh,
 128                                             struct v4l2_fmtdesc *f);
 129 #if 1
 130         /* deprecated, will be removed in 2.6.28 */
 131         int (*vidioc_enum_fmt_vbi_cap)     (struct file *file, void *fh,
 132                                             struct v4l2_fmtdesc *f);
 133 #endif
 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_vid_cap)    (struct file *file, void *fh,
 139                                         struct v4l2_format *f);
 140         int (*vidioc_g_fmt_vid_overlay)(struct file *file, void *fh,
 141                                         struct v4l2_format *f);
 142         int (*vidioc_g_fmt_vid_out)    (struct file *file, void *fh,
 143                                         struct v4l2_format *f);
 144         int (*vidioc_g_fmt_vid_out_overlay)(struct file *file, void *fh,
 145                                         struct v4l2_format *f);
 146         int (*vidioc_g_fmt_vbi_cap)    (struct file *file, void *fh,
 147                                         struct v4l2_format *f);
 148         int (*vidioc_g_fmt_vbi_out)    (struct file *file, void *fh,
 149                                         struct v4l2_format *f);
 150         int (*vidioc_g_fmt_sliced_vbi_cap)(struct file *file, void *fh,
 151                                         struct v4l2_format *f);
 152         int (*vidioc_g_fmt_sliced_vbi_out)(struct file *file, void *fh,
 153                                         struct v4l2_format *f);
 154         int (*vidioc_g_fmt_type_private)(struct file *file, void *fh,
 155                                         struct v4l2_format *f);
 156
 157         /* VIDIOC_S_FMT handlers */
 158         int (*vidioc_s_fmt_vid_cap)    (struct file *file, void *fh,
 159                                         struct v4l2_format *f);
 160         int (*vidioc_s_fmt_vid_overlay)(struct file *file, void *fh,
 161                                         struct v4l2_format *f);
 162         int (*vidioc_s_fmt_vid_out)    (struct file *file, void *fh,
 163                                         struct v4l2_format *f);
 164         int (*vidioc_s_fmt_vid_out_overlay)(struct file *file, void *fh,
 165                                         struct v4l2_format *f);
 166         int (*vidioc_s_fmt_vbi_cap)    (struct file *file, void *fh,
 167                                         struct v4l2_format *f);
 168         int (*vidioc_s_fmt_vbi_out)    (struct file *file, void *fh,
 169                                         struct v4l2_format *f);
 170         int (*vidioc_s_fmt_sliced_vbi_cap)(struct file *file, void *fh,
 171                                         struct v4l2_format *f);
 172         int (*vidioc_s_fmt_sliced_vbi_out)(struct file *file, void *fh,
 173                                         struct v4l2_format *f);
 174         int (*vidioc_s_fmt_type_private)(struct file *file, void *fh,
 175                                         struct v4l2_format *f);
 176
 177         /* VIDIOC_TRY_FMT handlers */
 178         int (*vidioc_try_fmt_vid_cap)    (struct file *file, void *fh,
 179                                           struct v4l2_format *f);
 180         int (*vidioc_try_fmt_vid_overlay)(struct file *file, void *fh,
 181                                           struct v4l2_format *f);
 182         int (*vidioc_try_fmt_vid_out)    (struct file *file, void *fh,
 183                                           struct v4l2_format *f);
 184         int (*vidioc_try_fmt_vid_out_overlay)(struct file *file, void *fh,
 185                                           struct v4l2_format *f);
 186         int (*vidioc_try_fmt_vbi_cap)    (struct file *file, void *fh,
 187                                           struct v4l2_format *f);
 188         int (*vidioc_try_fmt_vbi_out)    (struct file *file, void *fh,
 189                                           struct v4l2_format *f);
 190         int (*vidioc_try_fmt_sliced_vbi_cap)(struct file *file, void *fh,
 191                                           struct v4l2_format *f);
 192         int (*vidioc_try_fmt_sliced_vbi_out)(struct file *file, void *fh,
 193                                           struct v4l2_format *f);
 194         int (*vidioc_try_fmt_type_private)(struct file *file, void *fh,
 195                                           struct v4l2_format *f);
 196
 197         /* Buffer handlers */
 198         int (*vidioc_reqbufs) (struct file *file, void *fh, struct v4l2_requestbuffers *b);
 199         int (*vidioc_querybuf)(struct file *file, void *fh, struct v4l2_buffer *b);
 200         int (*vidioc_qbuf)    (struct file *file, void *fh, struct v4l2_buffer *b);
 201         int (*vidioc_dqbuf)   (struct file *file, void *fh, struct v4l2_buffer *b);
 202
 203
 204         int (*vidioc_overlay) (struct file *file, void *fh, unsigned int i);
 205 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 206                         /* buffer type is struct vidio_mbuf * */
 207         int (*vidiocgmbuf)  (struct file *file, void *fh, struct video_mbuf *p);
 208 #endif
 209         int (*vidioc_g_fbuf)   (struct file *file, void *fh,
 210                                 struct v4l2_framebuffer *a);
 211         int (*vidioc_s_fbuf)   (struct file *file, void *fh,
 212                                 struct v4l2_framebuffer *a);
 213
 214                 /* Stream on/off */
 215         int (*vidioc_streamon) (struct file *file, void *fh, enum v4l2_buf_type i);
 216         int (*vidioc_streamoff)(struct file *file, void *fh, enum v4l2_buf_type i);
 217
 218                 /* Standard handling
 219                         ENUMSTD is handled by videodev.c
 220                  */
 221         int (*vidioc_g_std) (struct file *file, void *fh, v4l2_std_id *norm);
 222         int (*vidioc_s_std) (struct file *file, void *fh, v4l2_std_id *norm);
 223         int (*vidioc_querystd) (struct file *file, void *fh, v4l2_std_id *a);
 224
 225                 /* Input handling */
 226         int (*vidioc_enum_input)(struct file *file, void *fh,
 227                                  struct v4l2_input *inp);
 228         int (*vidioc_g_input)   (struct file *file, void *fh, unsigned int *i);
 229         int (*vidioc_s_input)   (struct file *file, void *fh, unsigned int i);
 230
 231                 /* Output handling */
 232         int (*vidioc_enum_output) (struct file *file, void *fh,
 233                                   struct v4l2_output *a);
 234         int (*vidioc_g_output)   (struct file *file, void *fh, unsigned int *i);
 235         int (*vidioc_s_output)   (struct file *file, void *fh, unsigned int i);
 236
 237                 /* Control handling */
 238         int (*vidioc_queryctrl)        (struct file *file, void *fh,
 239                                         struct v4l2_queryctrl *a);
 240         int (*vidioc_g_ctrl)           (struct file *file, void *fh,
 241                                         struct v4l2_control *a);
 242         int (*vidioc_s_ctrl)           (struct file *file, void *fh,
 243                                         struct v4l2_control *a);
 244         int (*vidioc_g_ext_ctrls)      (struct file *file, void *fh,
 245                                         struct v4l2_ext_controls *a);
 246         int (*vidioc_s_ext_ctrls)      (struct file *file, void *fh,
 247                                         struct v4l2_ext_controls *a);
 248         int (*vidioc_try_ext_ctrls)    (struct file *file, void *fh,
 249                                         struct v4l2_ext_controls *a);
 250         int (*vidioc_querymenu)        (struct file *file, void *fh,
 251                                         struct v4l2_querymenu *a);
 252
 253         /* Audio ioctls */
 254         int (*vidioc_enumaudio)        (struct file *file, void *fh,
 255                                         struct v4l2_audio *a);
 256         int (*vidioc_g_audio)          (struct file *file, void *fh,
 257                                         struct v4l2_audio *a);
 258         int (*vidioc_s_audio)          (struct file *file, void *fh,
 259                                         struct v4l2_audio *a);
 260
 261         /* Audio out ioctls */
 262         int (*vidioc_enumaudout)       (struct file *file, void *fh,
 263                                         struct v4l2_audioout *a);
 264         int (*vidioc_g_audout)         (struct file *file, void *fh,
 265                                         struct v4l2_audioout *a);
 266         int (*vidioc_s_audout)         (struct file *file, void *fh,
 267                                         struct v4l2_audioout *a);
 268         int (*vidioc_g_modulator)      (struct file *file, void *fh,
 269                                         struct v4l2_modulator *a);
 270         int (*vidioc_s_modulator)      (struct file *file, void *fh,
 271                                         struct v4l2_modulator *a);
 272         /* Crop ioctls */
 273         int (*vidioc_cropcap)          (struct file *file, void *fh,
 274                                         struct v4l2_cropcap *a);
 275         int (*vidioc_g_crop)           (struct file *file, void *fh,
 276                                         struct v4l2_crop *a);
 277         int (*vidioc_s_crop)           (struct file *file, void *fh,
 278                                         struct v4l2_crop *a);
 279         /* Compression ioctls */
 280         int (*vidioc_g_jpegcomp)       (struct file *file, void *fh,
 281                                         struct v4l2_jpegcompression *a);
 282         int (*vidioc_s_jpegcomp)       (struct file *file, void *fh,
 283                                         struct v4l2_jpegcompression *a);
 284         int (*vidioc_g_enc_index)      (struct file *file, void *fh,
 285                                         struct v4l2_enc_idx *a);
 286         int (*vidioc_encoder_cmd)      (struct file *file, void *fh,
 287                                         struct v4l2_encoder_cmd *a);
 288         int (*vidioc_try_encoder_cmd)  (struct file *file, void *fh,
 289                                         struct v4l2_encoder_cmd *a);
 290
 291         /* Stream type-dependent parameter ioctls */
 292         int (*vidioc_g_parm)           (struct file *file, void *fh,
 293                                         struct v4l2_streamparm *a);
 294         int (*vidioc_s_parm)           (struct file *file, void *fh,
 295                                         struct v4l2_streamparm *a);
 296
 297         /* Tuner ioctls */
 298         int (*vidioc_g_tuner)          (struct file *file, void *fh,
 299                                         struct v4l2_tuner *a);
 300         int (*vidioc_s_tuner)          (struct file *file, void *fh,
 301                                         struct v4l2_tuner *a);
 302         int (*vidioc_g_frequency)      (struct file *file, void *fh,
 303                                         struct v4l2_frequency *a);
 304         int (*vidioc_s_frequency)      (struct file *file, void *fh,
 305                                         struct v4l2_frequency *a);
 306
 307         /* Sliced VBI cap */
 308         int (*vidioc_g_sliced_vbi_cap) (struct file *file, void *fh,
 309                                         struct v4l2_sliced_vbi_cap *a);
 310
 311         /* Log status ioctl */
 312         int (*vidioc_log_status)       (struct file *file, void *fh);
 313
 314         int (*vidioc_s_hw_freq_seek)   (struct file *file, void *fh,
 315                                         struct v4l2_hw_freq_seek *a);
 316
 317         /* Debugging ioctls */
 318 #ifdef CONFIG_VIDEO_ADV_DEBUG
 319         int (*vidioc_g_register)       (struct file *file, void *fh,
 320                                         struct v4l2_register *reg);
 321         int (*vidioc_s_register)       (struct file *file, void *fh,
 322                                         struct v4l2_register *reg);
 323 #endif
 324         int (*vidioc_g_chip_ident)     (struct file *file, void *fh,
 325                                         struct v4l2_chip_ident *chip);
 326
 327         /* For other private ioctls */
 328         int (*vidioc_default)          (struct file *file, void *fh,
 329                                         int cmd, void *arg);
 330
 331
 332 #ifdef OBSOLETE_OWNER /* to be removed soon */
 333 /* obsolete -- fops->owner is used instead */
 334 struct module *owner;
 335 /* dev->driver_data will be used instead some day.
 336         * Use the video_{get|set}_drvdata() helper functions,
 337         * so the switch over will be transparent for you.
 338         * Or use {pci|usb}_{get|set}_drvdata() directly. */
 339 void *priv;
 340 #endif
 341
 342         /* for videodev.c intenal usage -- please don't touch */
 343         int users;                     /* video_exclusive_{open|close} ... */
 344         struct mutex lock;             /* ... helper function uses these   */
 345 };
 346
 347 /* Class-dev to video-device */
 348 #define to_video_device(cd) container_of(cd, struct video_device, class_dev)
 349
 350 /* Version 2 functions */
 351 extern int video_register_device(struct video_device *vfd, int type, int nr);
 352 int video_register_device_index(struct video_device *vfd, int type, int nr,
 353                                         int index);
 354 void video_unregister_device(struct video_device *);
 355 extern int video_ioctl2(struct inode *inode, struct file *file,
 356                           unsigned int cmd, unsigned long arg);
 357
 358 /* helper functions to alloc / release struct video_device, the
 359    later can be used for video_device->release() */
 360 struct video_device *video_device_alloc(void);
 361 void video_device_release(struct video_device *vfd);
 362
 363 /* Include support for obsoleted stuff */
 364 extern int video_usercopy(struct inode *inode, struct file *file,
 365                           unsigned int cmd, unsigned long arg,
 366                           int (*func)(struct inode *inode, struct file *file,
 367                                       unsigned int cmd, void *arg));
 368
 369 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 370 #include <linux/mm.h>
 371
 372 static inline int __must_check
 373 video_device_create_file(struct video_device *vfd,
 374                          struct device_attribute *attr)
 375 {
 376         int ret = device_create_file(&vfd->class_dev, attr);
 377         if (ret < 0)
 378                 printk(KERN_WARNING "%s error: %d\n", __func__, ret);
 379         return ret;
 380 }
 381 static inline void
 382 video_device_remove_file(struct video_device *vfd,
 383                          struct device_attribute *attr)
 384 {
 385         device_remove_file(&vfd->class_dev, attr);
 386 }
 387
 388 #endif /* CONFIG_VIDEO_V4L1_COMPAT */
 389
 390 #ifdef OBSOLETE_OWNER /* to be removed soon */
 391 /* helper functions to access driver private data. */
 392 static inline void *video_get_drvdata(struct video_device *dev)
 393 {
 394         return dev->priv;
 395 }
 396
 397 static inline void video_set_drvdata(struct video_device *dev, void *data)
 398 {
 399         dev->priv = data;
 400 }
 401
 402 #endif
 403
 404 #ifdef OBSOLETE_DEVDATA /* to be removed soon */
 405 /* Obsolete stuff - Still needed for radio devices and obsolete drivers */
 406 extern struct video_device* video_devdata(struct file*);
 407 extern int video_exclusive_open(struct inode *inode, struct file *file);
 408 extern int video_exclusive_release(struct inode *inode, struct file *file);
 409 #endif
 410
 411 #endif /* _V4L2_DEV_H */