include/media/v4l2-subdev.h

   1 /*
   2     V4L2 sub-device support header.
   3
   4     Copyright (C) 2008  Hans Verkuil <hverkuil@xs4all.nl>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #ifndef _V4L2_SUBDEV_H
  22 #define _V4L2_SUBDEV_H
  23
  24 #include <linux/v4l2-subdev.h>
  25 #include <media/media-entity.h>
  26 #include <media/v4l2-common.h>
  27 #include <media/v4l2-dev.h>
  28 #include <media/v4l2-fh.h>
  29 #include <media/v4l2-mediabus.h>
  30
  31 /* generic v4l2_device notify callback notification values */
  32 #define V4L2_SUBDEV_IR_RX_NOTIFY                _IOW('v', 0, u32)
  33 #define V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ      0x00000001
  34 #define V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED    0x00000002
  35 #define V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN       0x00000004
  36 #define V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN       0x00000008
  37
  38 #define V4L2_SUBDEV_IR_TX_NOTIFY                _IOW('v', 1, u32)
  39 #define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ      0x00000001
  40
  41 struct v4l2_device;
  42 struct v4l2_ctrl_handler;
  43 struct v4l2_event_subscription;
  44 struct v4l2_fh;
  45 struct v4l2_subdev;
  46 struct v4l2_subdev_fh;
  47 struct tuner_setup;
  48
  49 /* decode_vbi_line */
  50 struct v4l2_decode_vbi_line {
  51         u32 is_second_field;    /* Set to 0 for the first (odd) field,
  52                                    set to 1 for the second (even) field. */
  53         u8 *p;                  /* Pointer to the sliced VBI data from the decoder.
  54                                    On exit points to the start of the payload. */
  55         u32 line;               /* Line number of the sliced VBI data (1-23) */
  56         u32 type;               /* VBI service type (V4L2_SLICED_*). 0 if no service found */
  57 };
  58
  59 /* Sub-devices are devices that are connected somehow to the main bridge
  60    device. These devices are usually audio/video muxers/encoders/decoders or
  61    sensors and webcam controllers.
  62
  63    Usually these devices are controlled through an i2c bus, but other busses
  64    may also be used.
  65
  66    The v4l2_subdev struct provides a way of accessing these devices in a
  67    generic manner. Most operations that these sub-devices support fall in
  68    a few categories: core ops, audio ops, video ops and tuner ops.
  69
  70    More categories can be added if needed, although this should remain a
  71    limited set (no more than approx. 8 categories).
  72
  73    Each category has its own set of ops that subdev drivers can implement.
  74
  75    A subdev driver can leave the pointer to the category ops NULL if
  76    it does not implement them (e.g. an audio subdev will generally not
  77    implement the video category ops). The exception is the core category:
  78    this must always be present.
  79
  80    These ops are all used internally so it is no problem to change, remove
  81    or add ops or move ops from one to another category. Currently these
  82    ops are based on the original ioctls, but since ops are not limited to
  83    one argument there is room for improvement here once all i2c subdev
  84    drivers are converted to use these ops.
  85  */
  86
  87 /* Core ops: it is highly recommended to implement at least these ops:
  88
  89    g_chip_ident
  90    log_status
  91    g_register
  92    s_register
  93
  94    This provides basic debugging support.
  95
  96    The ioctl ops is meant for generic ioctl-like commands. Depending on
  97    the use-case it might be better to use subdev-specific ops (currently
  98    not yet implemented) since ops provide proper type-checking.
  99  */
 100
 101 /* Subdevice external IO pin configuration */
 102 #define V4L2_SUBDEV_IO_PIN_DISABLE      (1 << 0) /* ENABLE assumed */
 103 #define V4L2_SUBDEV_IO_PIN_OUTPUT       (1 << 1)
 104 #define V4L2_SUBDEV_IO_PIN_INPUT        (1 << 2)
 105 #define V4L2_SUBDEV_IO_PIN_SET_VALUE    (1 << 3) /* Set output value */
 106 #define V4L2_SUBDEV_IO_PIN_ACTIVE_LOW   (1 << 4) /* ACTIVE HIGH assumed */
 107
 108 struct v4l2_subdev_io_pin_config {
 109         u32 flags;      /* V4L2_SUBDEV_IO_PIN_* flags for this pin's config */
 110         u8 pin;         /* Chip external IO pin to configure */
 111         u8 function;    /* Internal signal pad/function to route to IO pin */
 112         u8 value;       /* Initial value for pin - e.g. GPIO output value */
 113         u8 strength;    /* Pin drive strength */
 114 };
 115
 116 /*
 117    s_io_pin_config: configure one or more chip I/O pins for chips that
 118         multiplex different internal signal pads out to IO pins.  This function
 119         takes a pointer to an array of 'n' pin configuration entries, one for
 120         each pin being configured.  This function could be called at times
 121         other than just subdevice initialization.
 122
 123    init: initialize the sensor registors to some sort of reasonable default
 124         values. Do not use for new drivers and should be removed in existing
 125         drivers.
 126
 127    load_fw: load firmware.
 128
 129    reset: generic reset command. The argument selects which subsystems to
 130         reset. Passing 0 will always reset the whole chip. Do not use for new
 131         drivers without discussing this first on the linux-media mailinglist.
 132         There should be no reason normally to reset a device.
 133
 134    s_gpio: set GPIO pins. Very simple right now, might need to be extended with
 135         a direction argument if needed.
 136
 137    s_power: puts subdevice in power saving mode (on == 0) or normal operation
 138         mode (on == 1).
 139
 140    interrupt_service_routine: Called by the bridge chip's interrupt service
 141         handler, when an interrupt status has be raised due to this subdev,
 142         so that this subdev can handle the details.  It may schedule work to be
 143         performed later.  It must not sleep.  *Called from an IRQ context*.
 144  */
 145 struct v4l2_subdev_core_ops {
 146         int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip);
 147         int (*log_status)(struct v4l2_subdev *sd);
 148         int (*s_io_pin_config)(struct v4l2_subdev *sd, size_t n,
 149                                       struct v4l2_subdev_io_pin_config *pincfg);
 150         int (*init)(struct v4l2_subdev *sd, u32 val);
 151         int (*load_fw)(struct v4l2_subdev *sd);
 152         int (*reset)(struct v4l2_subdev *sd, u32 val);
 153         int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
 154         int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
 155         int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
 156         int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
 157         int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
 158         int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
 159         int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
 160         int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
 161         int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
 162         long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
 163 #ifdef CONFIG_VIDEO_ADV_DEBUG
 164         int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
 165         int (*s_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
 166 #endif
 167         int (*s_power)(struct v4l2_subdev *sd, int on);
 168         int (*interrupt_service_routine)(struct v4l2_subdev *sd,
 169                                                 u32 status, bool *handled);
 170         int (*subscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
 171                                struct v4l2_event_subscription *sub);
 172         int (*unsubscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
 173                                  struct v4l2_event_subscription *sub);
 174 };
 175
 176 /* s_mode: switch the tuner to a specific tuner mode. Replacement of s_radio.
 177
 178    s_radio: v4l device was opened in Radio mode, to be replaced by s_mode.
 179
 180    s_type_addr: sets tuner type and its I2C addr.
 181
 182    s_config: sets tda9887 specific stuff, like port1, port2 and qss
 183  */
 184 struct v4l2_subdev_tuner_ops {
 185         int (*s_mode)(struct v4l2_subdev *sd, enum v4l2_tuner_type);
 186         int (*s_radio)(struct v4l2_subdev *sd);
 187         int (*s_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
 188         int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
 189         int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
 190         int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
 191         int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
 192         int (*s_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
 193         int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
 194         int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
 195 };
 196
 197 /* s_clock_freq: set the frequency (in Hz) of the audio clock output.
 198         Used to slave an audio processor to the video decoder, ensuring that
 199         audio and video remain synchronized. Usual values for the frequency
 200         are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
 201         -EINVAL is returned.
 202
 203    s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
 204         way to select I2S clock used by driving digital audio streams at some
 205         board designs. Usual values for the frequency are 1024000 and 2048000.
 206         If the frequency is not supported, then -EINVAL is returned.
 207
 208    s_routing: used to define the input and/or output pins of an audio chip,
 209         and any additional configuration data.
 210         Never attempt to use user-level input IDs (e.g. Composite, S-Video,
 211         Tuner) at this level. An i2c device shouldn't know about whether an
 212         input pin is connected to a Composite connector, become on another
 213         board or platform it might be connected to something else entirely.
 214         The calling driver is responsible for mapping a user-level input to
 215         the right pins on the i2c device.
 216  */
 217 struct v4l2_subdev_audio_ops {
 218         int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
 219         int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
 220         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
 221         int (*s_stream)(struct v4l2_subdev *sd, int enable);
 222 };
 223
 224 /*
 225    s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
 226         video input devices.
 227
 228    s_crystal_freq: sets the frequency of the crystal used to generate the
 229         clocks in Hz. An extra flags field allows device specific configuration
 230         regarding clock frequency dividers, etc. If not used, then set flags
 231         to 0. If the frequency is not supported, then -EINVAL is returned.
 232
 233    g_input_status: get input status. Same as the status field in the v4l2_input
 234         struct.
 235
 236    s_routing: see s_routing in audio_ops, except this version is for video
 237         devices.
 238
 239    s_dv_preset: set dv (Digital Video) preset in the sub device. Similar to
 240         s_std()
 241
 242    query_dv_preset: query dv preset in the sub device. This is similar to
 243         querystd()
 244
 245    s_dv_timings(): Set custom dv timings in the sub device. This is used
 246         when sub device is capable of setting detailed timing information
 247         in the hardware to generate/detect the video signal.
 248
 249    g_dv_timings(): Get custom dv timings in the sub device.
 250
 251    enum_mbus_fmt: enumerate pixel formats, provided by a video data source
 252
 253    g_mbus_fmt: get the current pixel format, provided by a video data source
 254
 255    try_mbus_fmt: try to set a pixel format on a video data source
 256
 257    s_mbus_fmt: set a pixel format on a video data source
 258  */
 259 struct v4l2_subdev_video_ops {
 260         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
 261         int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
 262         int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
 263         int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
 264         int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
 265         int (*s_stream)(struct v4l2_subdev *sd, int enable);
 266         int (*cropcap)(struct v4l2_subdev *sd, struct v4l2_cropcap *cc);
 267         int (*g_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
 268         int (*s_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
 269         int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
 270         int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
 271         int (*g_frame_interval)(struct v4l2_subdev *sd,
 272                                 struct v4l2_subdev_frame_interval *interval);
 273         int (*s_frame_interval)(struct v4l2_subdev *sd,
 274                                 struct v4l2_subdev_frame_interval *interval);
 275         int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize);
 276         int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival);
 277         int (*enum_dv_presets) (struct v4l2_subdev *sd,
 278                         struct v4l2_dv_enum_preset *preset);
 279         int (*s_dv_preset)(struct v4l2_subdev *sd,
 280                         struct v4l2_dv_preset *preset);
 281         int (*query_dv_preset)(struct v4l2_subdev *sd,
 282                         struct v4l2_dv_preset *preset);
 283         int (*s_dv_timings)(struct v4l2_subdev *sd,
 284                         struct v4l2_dv_timings *timings);
 285         int (*g_dv_timings)(struct v4l2_subdev *sd,
 286                         struct v4l2_dv_timings *timings);
 287         int (*enum_mbus_fmt)(struct v4l2_subdev *sd, unsigned int index,
 288                              enum v4l2_mbus_pixelcode *code);
 289         int (*enum_mbus_fsizes)(struct v4l2_subdev *sd,
 290                              struct v4l2_frmsizeenum *fsize);
 291         int (*g_mbus_fmt)(struct v4l2_subdev *sd,
 292                           struct v4l2_mbus_framefmt *fmt);
 293         int (*try_mbus_fmt)(struct v4l2_subdev *sd,
 294                             struct v4l2_mbus_framefmt *fmt);
 295         int (*s_mbus_fmt)(struct v4l2_subdev *sd,
 296                           struct v4l2_mbus_framefmt *fmt);
 297 };
 298
 299 /*
 300    decode_vbi_line: video decoders that support sliced VBI need to implement
 301         this ioctl. Field p of the v4l2_sliced_vbi_line struct is set to the
 302         start of the VBI data that was generated by the decoder. The driver
 303         then parses the sliced VBI data and sets the other fields in the
 304         struct accordingly. The pointer p is updated to point to the start of
 305         the payload which can be copied verbatim into the data field of the
 306         v4l2_sliced_vbi_data struct. If no valid VBI data was found, then the
 307         type field is set to 0 on return.
 308
 309    s_vbi_data: used to generate VBI signals on a video signal.
 310         v4l2_sliced_vbi_data is filled with the data packets that should be
 311         output. Note that if you set the line field to 0, then that VBI signal
 312         is disabled. If no valid VBI data was found, then the type field is
 313         set to 0 on return.
 314
 315    g_vbi_data: used to obtain the sliced VBI packet from a readback register.
 316         Not all video decoders support this. If no data is available because
 317         the readback register contains invalid or erroneous data -EIO is
 318         returned. Note that you must fill in the 'id' member and the 'field'
 319         member (to determine whether CC data from the first or second field
 320         should be obtained).
 321
 322    s_raw_fmt: setup the video encoder/decoder for raw VBI.
 323
 324    g_sliced_fmt: retrieve the current sliced VBI settings.
 325
 326    s_sliced_fmt: setup the sliced VBI settings.
 327  */
 328 struct v4l2_subdev_vbi_ops {
 329         int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
 330         int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
 331         int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
 332         int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
 333         int (*s_raw_fmt)(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt);
 334         int (*g_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
 335         int (*s_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
 336 };
 337
 338 /**
 339  * struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
 340  * @g_skip_top_lines: number of lines at the top of the image to be skipped.
 341  *                    This is needed for some sensors, which always corrupt
 342  *                    several top lines of the output image, or which send their
 343  *                    metadata in them.
 344  * @g_skip_frames: number of frames to skip at stream start. This is needed for
 345  *                 buggy sensors that generate faulty frames when they are
 346  *                 turned on.
 347  */
 348 struct v4l2_subdev_sensor_ops {
 349         int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
 350         int (*g_skip_frames)(struct v4l2_subdev *sd, u32 *frames);
 351 };
 352
 353 /*
 354    [rt]x_g_parameters: Get the current operating parameters and state of the
 355         the IR receiver or transmitter.
 356
 357    [rt]x_s_parameters: Set the current operating parameters and state of the
 358         the IR receiver or transmitter.  It is recommended to call
 359         [rt]x_g_parameters first to fill out the current state, and only change
 360         the fields that need to be changed.  Upon return, the actual device
 361         operating parameters and state will be returned.  Note that hardware
 362         limitations may prevent the actual settings from matching the requested
 363         settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
 364         was requested.  An exception is when the shutdown parameter is true.
 365         The last used operational parameters will be returned, but the actual
 366         state of the hardware be different to minimize power consumption and
 367         processing when shutdown is true.
 368
 369    rx_read: Reads received codes or pulse width data.
 370         The semantics are similar to a non-blocking read() call.
 371
 372    tx_write: Writes codes or pulse width data for transmission.
 373         The semantics are similar to a non-blocking write() call.
 374  */
 375
 376 enum v4l2_subdev_ir_mode {
 377         V4L2_SUBDEV_IR_MODE_PULSE_WIDTH, /* uses struct ir_raw_event records */
 378 };
 379
 380 struct v4l2_subdev_ir_parameters {
 381         /* Either Rx or Tx */
 382         unsigned int bytes_per_data_element; /* of data in read or write call */
 383         enum v4l2_subdev_ir_mode mode;
 384
 385         bool enable;
 386         bool interrupt_enable;
 387         bool shutdown; /* true: set hardware to low/no power, false: normal */
 388
 389         bool modulation;           /* true: uses carrier, false: baseband */
 390         u32 max_pulse_width;       /* ns,      valid only for baseband signal */
 391         unsigned int carrier_freq; /* Hz,      valid only for modulated signal*/
 392         unsigned int duty_cycle;   /* percent, valid only for modulated signal*/
 393         bool invert_level;         /* invert signal level */
 394
 395         /* Tx only */
 396         bool invert_carrier_sense; /* Send 0/space as a carrier burst */
 397
 398         /* Rx only */
 399         u32 noise_filter_min_width;       /* ns, min time of a valid pulse */
 400         unsigned int carrier_range_lower; /* Hz, valid only for modulated sig */
 401         unsigned int carrier_range_upper; /* Hz, valid only for modulated sig */
 402         u32 resolution;                   /* ns */
 403 };
 404
 405 struct v4l2_subdev_ir_ops {
 406         /* Receiver */
 407         int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
 408                                 ssize_t *num);
 409
 410         int (*rx_g_parameters)(struct v4l2_subdev *sd,
 411                                 struct v4l2_subdev_ir_parameters *params);
 412         int (*rx_s_parameters)(struct v4l2_subdev *sd,
 413                                 struct v4l2_subdev_ir_parameters *params);
 414
 415         /* Transmitter */
 416         int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
 417                                 ssize_t *num);
 418
 419         int (*tx_g_parameters)(struct v4l2_subdev *sd,
 420                                 struct v4l2_subdev_ir_parameters *params);
 421         int (*tx_s_parameters)(struct v4l2_subdev *sd,
 422                                 struct v4l2_subdev_ir_parameters *params);
 423 };
 424
 425 struct v4l2_subdev_pad_ops {
 426         int (*enum_mbus_code)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 427                               struct v4l2_subdev_mbus_code_enum *code);
 428         int (*enum_frame_size)(struct v4l2_subdev *sd,
 429                                struct v4l2_subdev_fh *fh,
 430                                struct v4l2_subdev_frame_size_enum *fse);
 431         int (*enum_frame_interval)(struct v4l2_subdev *sd,
 432                                    struct v4l2_subdev_fh *fh,
 433                                    struct v4l2_subdev_frame_interval_enum *fie);
 434         int (*get_fmt)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 435                        struct v4l2_subdev_format *format);
 436         int (*set_fmt)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 437                        struct v4l2_subdev_format *format);
 438         int (*set_crop)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 439                        struct v4l2_subdev_crop *crop);
 440         int (*get_crop)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 441                        struct v4l2_subdev_crop *crop);
 442 };
 443
 444 struct v4l2_subdev_ops {
 445         const struct v4l2_subdev_core_ops       *core;
 446         const struct v4l2_subdev_tuner_ops      *tuner;
 447         const struct v4l2_subdev_audio_ops      *audio;
 448         const struct v4l2_subdev_video_ops      *video;
 449         const struct v4l2_subdev_vbi_ops        *vbi;
 450         const struct v4l2_subdev_ir_ops         *ir;
 451         const struct v4l2_subdev_sensor_ops     *sensor;
 452         const struct v4l2_subdev_pad_ops        *pad;
 453 };
 454
 455 /*
 456  * Internal ops. Never call this from drivers, only the v4l2 framework can call
 457  * these ops.
 458  *
 459  * registered: called when this subdev is registered. When called the v4l2_dev
 460  *      field is set to the correct v4l2_device.
 461  *
 462  * unregistered: called when this subdev is unregistered. When called the
 463  *      v4l2_dev field is still set to the correct v4l2_device.
 464  *
 465  * open: called when the subdev device node is opened by an application.
 466  *
 467  * close: called when the subdev device node is closed.
 468  */
 469 struct v4l2_subdev_internal_ops {
 470         int (*registered)(struct v4l2_subdev *sd);
 471         void (*unregistered)(struct v4l2_subdev *sd);
 472         int (*open)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
 473         int (*close)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
 474 };
 475
 476 #define V4L2_SUBDEV_NAME_SIZE 32
 477
 478 /* Set this flag if this subdev is a i2c device. */
 479 #define V4L2_SUBDEV_FL_IS_I2C                   (1U << 0)
 480 /* Set this flag if this subdev is a spi device. */
 481 #define V4L2_SUBDEV_FL_IS_SPI                   (1U << 1)
 482 /* Set this flag if this subdev needs a device node. */
 483 #define V4L2_SUBDEV_FL_HAS_DEVNODE              (1U << 2)
 484 /* Set this flag if this subdev generates events. */
 485 #define V4L2_SUBDEV_FL_HAS_EVENTS               (1U << 3)
 486
 487 /* Each instance of a subdev driver should create this struct, either
 488    stand-alone or embedded in a larger struct.
 489  */
 490 struct v4l2_subdev {
 491 #if defined(CONFIG_MEDIA_CONTROLLER)
 492         struct media_entity entity;
 493 #endif
 494         struct list_head list;
 495         struct module *owner;
 496         u32 flags;
 497         struct v4l2_device *v4l2_dev;
 498         const struct v4l2_subdev_ops *ops;
 499         /* Never call these internal ops from within a driver! */
 500         const struct v4l2_subdev_internal_ops *internal_ops;
 501         /* The control handler of this subdev. May be NULL. */
 502         struct v4l2_ctrl_handler *ctrl_handler;
 503         /* name must be unique */
 504         char name[V4L2_SUBDEV_NAME_SIZE];
 505         /* can be used to group similar subdevs, value is driver-specific */
 506         u32 grp_id;
 507         /* pointer to private data */
 508         void *dev_priv;
 509         void *host_priv;
 510         /* subdev device node */
 511         struct video_device devnode;
 512         /* number of events to be allocated on open */
 513         unsigned int nevents;
 514 };
 515
 516 #define media_entity_to_v4l2_subdev(ent) \
 517         container_of(ent, struct v4l2_subdev, entity)
 518 #define vdev_to_v4l2_subdev(vdev) \
 519         container_of(vdev, struct v4l2_subdev, devnode)
 520
 521 /*
 522  * Used for storing subdev information per file handle
 523  */
 524 struct v4l2_subdev_fh {
 525         struct v4l2_fh vfh;
 526 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 527         struct v4l2_mbus_framefmt *try_fmt;
 528         struct v4l2_rect *try_crop;
 529 #endif
 530 };
 531
 532 #define to_v4l2_subdev_fh(fh)   \
 533         container_of(fh, struct v4l2_subdev_fh, vfh)
 534
 535 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
 536 static inline struct v4l2_mbus_framefmt *
 537 v4l2_subdev_get_try_format(struct v4l2_subdev_fh *fh, unsigned int pad)
 538 {
 539         return &fh->try_fmt[pad];
 540 }
 541
 542 static inline struct v4l2_rect *
 543 v4l2_subdev_get_try_crop(struct v4l2_subdev_fh *fh, unsigned int pad)
 544 {
 545         return &fh->try_crop[pad];
 546 }
 547 #endif
 548
 549 extern const struct v4l2_file_operations v4l2_subdev_fops;
 550
 551 static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
 552 {
 553         sd->dev_priv = p;
 554 }
 555
 556 static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
 557 {
 558         return sd->dev_priv;
 559 }
 560
 561 static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p)
 562 {
 563         sd->host_priv = p;
 564 }
 565
 566 static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
 567 {
 568         return sd->host_priv;
 569 }
 570
 571 void v4l2_subdev_init(struct v4l2_subdev *sd,
 572                       const struct v4l2_subdev_ops *ops);
 573
 574 /* Call an ops of a v4l2_subdev, doing the right checks against
 575    NULL pointers.
 576
 577    Example: err = v4l2_subdev_call(sd, core, g_chip_ident, &chip);
 578  */
 579 #define v4l2_subdev_call(sd, o, f, args...)                             \
 580         (!(sd) ? -ENODEV : (((sd)->ops->o && (sd)->ops->o->f) ? \
 581                 (sd)->ops->o->f((sd) , ##args) : -ENOIOCTLCMD))
 582
 583 /* Send a notification to v4l2_device. */
 584 #define v4l2_subdev_notify(sd, notification, arg)                          \
 585         ((!(sd) || !(sd)->v4l2_dev || !(sd)->v4l2_dev->notify) ? -ENODEV : \
 586          (sd)->v4l2_dev->notify((sd), (notification), (arg)))
 587
 588 #endif