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 <media/v4l2-common.h>
  25 #include <media/v4l2-mediabus.h>
  26
  27 /* generic v4l2_device notify callback notification values */
  28 #define V4L2_SUBDEV_IR_RX_NOTIFY                _IOW('v', 0, u32)
  29 #define V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ      0x00000001
  30 #define V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED    0x00000002
  31 #define V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN       0x00000004
  32 #define V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN       0x00000008
  33
  34 #define V4L2_SUBDEV_IR_TX_NOTIFY                _IOW('v', 1, u32)
  35 #define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ      0x00000001
  36
  37 struct v4l2_device;
  38 struct v4l2_ctrl_handler;
  39 struct v4l2_subdev;
  40 struct tuner_setup;
  41
  42 /* decode_vbi_line */
  43 struct v4l2_decode_vbi_line {
  44         u32 is_second_field;    /* Set to 0 for the first (odd) field,
  45                                    set to 1 for the second (even) field. */
  46         u8 *p;                  /* Pointer to the sliced VBI data from the decoder.
  47                                    On exit points to the start of the payload. */
  48         u32 line;               /* Line number of the sliced VBI data (1-23) */
  49         u32 type;               /* VBI service type (V4L2_SLICED_*). 0 if no service found */
  50 };
  51
  52 /* Sub-devices are devices that are connected somehow to the main bridge
  53    device. These devices are usually audio/video muxers/encoders/decoders or
  54    sensors and webcam controllers.
  55
  56    Usually these devices are controlled through an i2c bus, but other busses
  57    may also be used.
  58
  59    The v4l2_subdev struct provides a way of accessing these devices in a
  60    generic manner. Most operations that these sub-devices support fall in
  61    a few categories: core ops, audio ops, video ops and tuner ops.
  62
  63    More categories can be added if needed, although this should remain a
  64    limited set (no more than approx. 8 categories).
  65
  66    Each category has its own set of ops that subdev drivers can implement.
  67
  68    A subdev driver can leave the pointer to the category ops NULL if
  69    it does not implement them (e.g. an audio subdev will generally not
  70    implement the video category ops). The exception is the core category:
  71    this must always be present.
  72
  73    These ops are all used internally so it is no problem to change, remove
  74    or add ops or move ops from one to another category. Currently these
  75    ops are based on the original ioctls, but since ops are not limited to
  76    one argument there is room for improvement here once all i2c subdev
  77    drivers are converted to use these ops.
  78  */
  79
  80 /* Core ops: it is highly recommended to implement at least these ops:
  81
  82    g_chip_ident
  83    log_status
  84    g_register
  85    s_register
  86
  87    This provides basic debugging support.
  88
  89    The ioctl ops is meant for generic ioctl-like commands. Depending on
  90    the use-case it might be better to use subdev-specific ops (currently
  91    not yet implemented) since ops provide proper type-checking.
  92  */
  93
  94 /* Subdevice external IO pin configuration */
  95 #define V4L2_SUBDEV_IO_PIN_DISABLE      (1 << 0) /* ENABLE assumed */
  96 #define V4L2_SUBDEV_IO_PIN_OUTPUT       (1 << 1)
  97 #define V4L2_SUBDEV_IO_PIN_INPUT        (1 << 2)
  98 #define V4L2_SUBDEV_IO_PIN_SET_VALUE    (1 << 3) /* Set output value */
  99 #define V4L2_SUBDEV_IO_PIN_ACTIVE_LOW   (1 << 4) /* ACTIVE HIGH assumed */
 100
 101 struct v4l2_subdev_io_pin_config {
 102         u32 flags;      /* V4L2_SUBDEV_IO_PIN_* flags for this pin's config */
 103         u8 pin;         /* Chip external IO pin to configure */
 104         u8 function;    /* Internal signal pad/function to route to IO pin */
 105         u8 value;       /* Initial value for pin - e.g. GPIO output value */
 106         u8 strength;    /* Pin drive strength */
 107 };
 108
 109 /* s_config: if set, then it is always called by the v4l2_i2c_new_subdev*
 110         functions after the v4l2_subdev was registered. It is used to pass
 111         platform data to the subdev which can be used during initialization.
 112
 113    s_io_pin_config: configure one or more chip I/O pins for chips that
 114         multiplex different internal signal pads out to IO pins.  This function
 115         takes a pointer to an array of 'n' pin configuration entries, one for
 116         each pin being configured.  This function could be called at times
 117         other than just subdevice initialization.
 118
 119    init: initialize the sensor registors to some sort of reasonable default
 120         values. Do not use for new drivers and should be removed in existing
 121         drivers.
 122
 123    load_fw: load firmware.
 124
 125    reset: generic reset command. The argument selects which subsystems to
 126         reset. Passing 0 will always reset the whole chip. Do not use for new
 127         drivers without discussing this first on the linux-media mailinglist.
 128         There should be no reason normally to reset a device.
 129
 130    s_gpio: set GPIO pins. Very simple right now, might need to be extended with
 131         a direction argument if needed.
 132
 133    s_power: puts subdevice in power saving mode (on == 0) or normal operation
 134         mode (on == 1).
 135
 136    interrupt_service_routine: Called by the bridge chip's interrupt service
 137         handler, when an interrupt status has be raised due to this subdev,
 138         so that this subdev can handle the details.  It may schedule work to be
 139         performed later.  It must not sleep.  *Called from an IRQ context*.
 140  */
 141 struct v4l2_subdev_core_ops {
 142         int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip);
 143         int (*log_status)(struct v4l2_subdev *sd);
 144         int (*s_config)(struct v4l2_subdev *sd, int irq, void *platform_data);
 145         int (*s_io_pin_config)(struct v4l2_subdev *sd, size_t n,
 146                                       struct v4l2_subdev_io_pin_config *pincfg);
 147         int (*init)(struct v4l2_subdev *sd, u32 val);
 148         int (*load_fw)(struct v4l2_subdev *sd);
 149         int (*reset)(struct v4l2_subdev *sd, u32 val);
 150         int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
 151         int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
 152         int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
 153         int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
 154         int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
 155         int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
 156         int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
 157         int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
 158         int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
 159         long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
 160 #ifdef CONFIG_VIDEO_ADV_DEBUG
 161         int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
 162         int (*s_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
 163 #endif
 164         int (*s_power)(struct v4l2_subdev *sd, int on);
 165         int (*interrupt_service_routine)(struct v4l2_subdev *sd,
 166                                                 u32 status, bool *handled);
 167 };
 168
 169 /* s_mode: switch the tuner to a specific tuner mode. Replacement of s_radio.
 170
 171    s_radio: v4l device was opened in Radio mode, to be replaced by s_mode.
 172
 173    s_type_addr: sets tuner type and its I2C addr.
 174
 175    s_config: sets tda9887 specific stuff, like port1, port2 and qss
 176  */
 177 struct v4l2_subdev_tuner_ops {
 178         int (*s_mode)(struct v4l2_subdev *sd, enum v4l2_tuner_type);
 179         int (*s_radio)(struct v4l2_subdev *sd);
 180         int (*s_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
 181         int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
 182         int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
 183         int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
 184         int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
 185         int (*s_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
 186         int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
 187         int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
 188 };
 189
 190 /* s_clock_freq: set the frequency (in Hz) of the audio clock output.
 191         Used to slave an audio processor to the video decoder, ensuring that
 192         audio and video remain synchronized. Usual values for the frequency
 193         are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
 194         -EINVAL is returned.
 195
 196    s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
 197         way to select I2S clock used by driving digital audio streams at some
 198         board designs. Usual values for the frequency are 1024000 and 2048000.
 199         If the frequency is not supported, then -EINVAL is returned.
 200
 201    s_routing: used to define the input and/or output pins of an audio chip,
 202         and any additional configuration data.
 203         Never attempt to use user-level input IDs (e.g. Composite, S-Video,
 204         Tuner) at this level. An i2c device shouldn't know about whether an
 205         input pin is connected to a Composite connector, become on another
 206         board or platform it might be connected to something else entirely.
 207         The calling driver is responsible for mapping a user-level input to
 208         the right pins on the i2c device.
 209  */
 210 struct v4l2_subdev_audio_ops {
 211         int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
 212         int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
 213         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
 214         int (*s_stream)(struct v4l2_subdev *sd, int enable);
 215 };
 216
 217 /*
 218    s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
 219         video input devices.
 220
 221    s_crystal_freq: sets the frequency of the crystal used to generate the
 222         clocks in Hz. An extra flags field allows device specific configuration
 223         regarding clock frequency dividers, etc. If not used, then set flags
 224         to 0. If the frequency is not supported, then -EINVAL is returned.
 225
 226    g_input_status: get input status. Same as the status field in the v4l2_input
 227         struct.
 228
 229    s_routing: see s_routing in audio_ops, except this version is for video
 230         devices.
 231
 232    s_dv_preset: set dv (Digital Video) preset in the sub device. Similar to
 233         s_std()
 234
 235    query_dv_preset: query dv preset in the sub device. This is similar to
 236         querystd()
 237
 238    s_dv_timings(): Set custom dv timings in the sub device. This is used
 239         when sub device is capable of setting detailed timing information
 240         in the hardware to generate/detect the video signal.
 241
 242    g_dv_timings(): Get custom dv timings in the sub device.
 243
 244    enum_mbus_fmt: enumerate pixel formats, provided by a video data source
 245
 246    g_mbus_fmt: get the current pixel format, provided by a video data source
 247
 248    try_mbus_fmt: try to set a pixel format on a video data source
 249
 250    s_mbus_fmt: set a pixel format on a video data source
 251  */
 252 struct v4l2_subdev_video_ops {
 253         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
 254         int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
 255         int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
 256         int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
 257         int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
 258         int (*s_stream)(struct v4l2_subdev *sd, int enable);
 259         int (*enum_fmt)(struct v4l2_subdev *sd, struct v4l2_fmtdesc *fmtdesc);
 260         int (*g_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
 261         int (*try_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
 262         int (*s_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
 263         int (*cropcap)(struct v4l2_subdev *sd, struct v4l2_cropcap *cc);
 264         int (*g_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
 265         int (*s_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
 266         int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
 267         int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
 268         int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize);
 269         int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival);
 270         int (*enum_dv_presets) (struct v4l2_subdev *sd,
 271                         struct v4l2_dv_enum_preset *preset);
 272         int (*s_dv_preset)(struct v4l2_subdev *sd,
 273                         struct v4l2_dv_preset *preset);
 274         int (*query_dv_preset)(struct v4l2_subdev *sd,
 275                         struct v4l2_dv_preset *preset);
 276         int (*s_dv_timings)(struct v4l2_subdev *sd,
 277                         struct v4l2_dv_timings *timings);
 278         int (*g_dv_timings)(struct v4l2_subdev *sd,
 279                         struct v4l2_dv_timings *timings);
 280         int (*enum_mbus_fmt)(struct v4l2_subdev *sd, unsigned int index,
 281                              enum v4l2_mbus_pixelcode *code);
 282         int (*g_mbus_fmt)(struct v4l2_subdev *sd,
 283                           struct v4l2_mbus_framefmt *fmt);
 284         int (*try_mbus_fmt)(struct v4l2_subdev *sd,
 285                             struct v4l2_mbus_framefmt *fmt);
 286         int (*s_mbus_fmt)(struct v4l2_subdev *sd,
 287                           struct v4l2_mbus_framefmt *fmt);
 288 };
 289
 290 /*
 291    decode_vbi_line: video decoders that support sliced VBI need to implement
 292         this ioctl. Field p of the v4l2_sliced_vbi_line struct is set to the
 293         start of the VBI data that was generated by the decoder. The driver
 294         then parses the sliced VBI data and sets the other fields in the
 295         struct accordingly. The pointer p is updated to point to the start of
 296         the payload which can be copied verbatim into the data field of the
 297         v4l2_sliced_vbi_data struct. If no valid VBI data was found, then the
 298         type field is set to 0 on return.
 299
 300    s_vbi_data: used to generate VBI signals on a video signal.
 301         v4l2_sliced_vbi_data is filled with the data packets that should be
 302         output. Note that if you set the line field to 0, then that VBI signal
 303         is disabled. If no valid VBI data was found, then the type field is
 304         set to 0 on return.
 305
 306    g_vbi_data: used to obtain the sliced VBI packet from a readback register.
 307         Not all video decoders support this. If no data is available because
 308         the readback register contains invalid or erroneous data -EIO is
 309         returned. Note that you must fill in the 'id' member and the 'field'
 310         member (to determine whether CC data from the first or second field
 311         should be obtained).
 312
 313    s_raw_fmt: setup the video encoder/decoder for raw VBI.
 314
 315    g_sliced_fmt: retrieve the current sliced VBI settings.
 316
 317    s_sliced_fmt: setup the sliced VBI settings.
 318  */
 319 struct v4l2_subdev_vbi_ops {
 320         int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
 321         int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
 322         int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
 323         int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
 324         int (*s_raw_fmt)(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt);
 325         int (*g_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
 326         int (*s_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
 327 };
 328
 329 /**
 330  * struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
 331  * @g_skip_top_lines: number of lines at the top of the image to be skipped.
 332  *                    This is needed for some sensors, which always corrupt
 333  *                    several top lines of the output image, or which send their
 334  *                    metadata in them.
 335  */
 336 struct v4l2_subdev_sensor_ops {
 337         int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
 338 };
 339
 340 /*
 341    [rt]x_g_parameters: Get the current operating parameters and state of the
 342         the IR receiver or transmitter.
 343
 344    [rt]x_s_parameters: Set the current operating parameters and state of the
 345         the IR receiver or transmitter.  It is recommended to call
 346         [rt]x_g_parameters first to fill out the current state, and only change
 347         the fields that need to be changed.  Upon return, the actual device
 348         operating parameters and state will be returned.  Note that hardware
 349         limitations may prevent the actual settings from matching the requested
 350         settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
 351         was requested.  An exception is when the shutdown parameter is true.
 352         The last used operational parameters will be returned, but the actual
 353         state of the hardware be different to minimize power consumption and
 354         processing when shutdown is true.
 355
 356    rx_read: Reads received codes or pulse width data.
 357         The semantics are similar to a non-blocking read() call.
 358
 359    tx_write: Writes codes or pulse width data for transmission.
 360         The semantics are similar to a non-blocking write() call.
 361  */
 362
 363 enum v4l2_subdev_ir_mode {
 364         V4L2_SUBDEV_IR_MODE_PULSE_WIDTH, /* uses struct ir_raw_event records */
 365 };
 366
 367 struct v4l2_subdev_ir_parameters {
 368         /* Either Rx or Tx */
 369         unsigned int bytes_per_data_element; /* of data in read or write call */
 370         enum v4l2_subdev_ir_mode mode;
 371
 372         bool enable;
 373         bool interrupt_enable;
 374         bool shutdown; /* true: set hardware to low/no power, false: normal */
 375
 376         bool modulation;           /* true: uses carrier, false: baseband */
 377         u32 max_pulse_width;       /* ns,      valid only for baseband signal */
 378         unsigned int carrier_freq; /* Hz,      valid only for modulated signal*/
 379         unsigned int duty_cycle;   /* percent, valid only for modulated signal*/
 380         bool invert_level;         /* invert signal level */
 381
 382         /* Tx only */
 383         bool invert_carrier_sense; /* Send 0/space as a carrier burst */
 384
 385         /* Rx only */
 386         u32 noise_filter_min_width;       /* ns, min time of a valid pulse */
 387         unsigned int carrier_range_lower; /* Hz, valid only for modulated sig */
 388         unsigned int carrier_range_upper; /* Hz, valid only for modulated sig */
 389         u32 resolution;                   /* ns */
 390 };
 391
 392 struct v4l2_subdev_ir_ops {
 393         /* Receiver */
 394         int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
 395                                 ssize_t *num);
 396
 397         int (*rx_g_parameters)(struct v4l2_subdev *sd,
 398                                 struct v4l2_subdev_ir_parameters *params);
 399         int (*rx_s_parameters)(struct v4l2_subdev *sd,
 400                                 struct v4l2_subdev_ir_parameters *params);
 401
 402         /* Transmitter */
 403         int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
 404                                 ssize_t *num);
 405
 406         int (*tx_g_parameters)(struct v4l2_subdev *sd,
 407                                 struct v4l2_subdev_ir_parameters *params);
 408         int (*tx_s_parameters)(struct v4l2_subdev *sd,
 409                                 struct v4l2_subdev_ir_parameters *params);
 410 };
 411
 412 struct v4l2_subdev_ops {
 413         const struct v4l2_subdev_core_ops       *core;
 414         const struct v4l2_subdev_tuner_ops      *tuner;
 415         const struct v4l2_subdev_audio_ops      *audio;
 416         const struct v4l2_subdev_video_ops      *video;
 417         const struct v4l2_subdev_vbi_ops        *vbi;
 418         const struct v4l2_subdev_ir_ops         *ir;
 419         const struct v4l2_subdev_sensor_ops     *sensor;
 420 };
 421
 422 #define V4L2_SUBDEV_NAME_SIZE 32
 423
 424 /* Set this flag if this subdev is a i2c device. */
 425 #define V4L2_SUBDEV_FL_IS_I2C (1U << 0)
 426 /* Set this flag if this subdev is a spi device. */
 427 #define V4L2_SUBDEV_FL_IS_SPI (1U << 1)
 428
 429 /* Each instance of a subdev driver should create this struct, either
 430    stand-alone or embedded in a larger struct.
 431  */
 432 struct v4l2_subdev {
 433         struct list_head list;
 434         struct module *owner;
 435         u32 flags;
 436         struct v4l2_device *v4l2_dev;
 437         const struct v4l2_subdev_ops *ops;
 438         /* The control handler of this subdev. May be NULL. */
 439         struct v4l2_ctrl_handler *ctrl_handler;
 440         /* name must be unique */
 441         char name[V4L2_SUBDEV_NAME_SIZE];
 442         /* can be used to group similar subdevs, value is driver-specific */
 443         u32 grp_id;
 444         /* pointer to private data */
 445         void *priv;
 446 };
 447
 448 static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
 449 {
 450         sd->priv = p;
 451 }
 452
 453 static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
 454 {
 455         return sd->priv;
 456 }
 457
 458 static inline void v4l2_subdev_init(struct v4l2_subdev *sd,
 459                                         const struct v4l2_subdev_ops *ops)
 460 {
 461         INIT_LIST_HEAD(&sd->list);
 462         /* ops->core MUST be set */
 463         BUG_ON(!ops || !ops->core);
 464         sd->ops = ops;
 465         sd->v4l2_dev = NULL;
 466         sd->flags = 0;
 467         sd->name[0] = '\0';
 468         sd->grp_id = 0;
 469         sd->priv = NULL;
 470 }
 471
 472 /* Call an ops of a v4l2_subdev, doing the right checks against
 473    NULL pointers.
 474
 475    Example: err = v4l2_subdev_call(sd, core, g_chip_ident, &chip);
 476  */
 477 #define v4l2_subdev_call(sd, o, f, args...)                             \
 478         (!(sd) ? -ENODEV : (((sd)->ops->o && (sd)->ops->o->f) ? \
 479                 (sd)->ops->o->f((sd) , ##args) : -ENOIOCTLCMD))
 480
 481 /* Send a notification to v4l2_device. */
 482 #define v4l2_subdev_notify(sd, notification, arg)                          \
 483         ((!(sd) || !(sd)->v4l2_dev || !(sd)->v4l2_dev->notify) ? -ENODEV : \
 484          (sd)->v4l2_dev->notify((sd), (notification), (arg)))
 485
 486 #endif