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_subdev;
  39 struct tuner_setup;
  40
  41 /* decode_vbi_line */
  42 struct v4l2_decode_vbi_line {
  43         u32 is_second_field;    /* Set to 0 for the first (odd) field,
  44                                    set to 1 for the second (even) field. */
  45         u8 *p;                  /* Pointer to the sliced VBI data from the decoder.
  46                                    On exit points to the start of the payload. */
  47         u32 line;               /* Line number of the sliced VBI data (1-23) */
  48         u32 type;               /* VBI service type (V4L2_SLICED_*). 0 if no service found */
  49 };
  50
  51 /* Sub-devices are devices that are connected somehow to the main bridge
  52    device. These devices are usually audio/video muxers/encoders/decoders or
  53    sensors and webcam controllers.
  54
  55    Usually these devices are controlled through an i2c bus, but other busses
  56    may also be used.
  57
  58    The v4l2_subdev struct provides a way of accessing these devices in a
  59    generic manner. Most operations that these sub-devices support fall in
  60    a few categories: core ops, audio ops, video ops and tuner ops.
  61
  62    More categories can be added if needed, although this should remain a
  63    limited set (no more than approx. 8 categories).
  64
  65    Each category has its own set of ops that subdev drivers can implement.
  66
  67    A subdev driver can leave the pointer to the category ops NULL if
  68    it does not implement them (e.g. an audio subdev will generally not
  69    implement the video category ops). The exception is the core category:
  70    this must always be present.
  71
  72    These ops are all used internally so it is no problem to change, remove
  73    or add ops or move ops from one to another category. Currently these
  74    ops are based on the original ioctls, but since ops are not limited to
  75    one argument there is room for improvement here once all i2c subdev
  76    drivers are converted to use these ops.
  77  */
  78
  79 /* Core ops: it is highly recommended to implement at least these ops:
  80
  81    g_chip_ident
  82    log_status
  83    g_register
  84    s_register
  85
  86    This provides basic debugging support.
  87
  88    The ioctl ops is meant for generic ioctl-like commands. Depending on
  89    the use-case it might be better to use subdev-specific ops (currently
  90    not yet implemented) since ops provide proper type-checking.
  91  */
  92
  93 /* s_config: if set, then it is always called by the v4l2_i2c_new_subdev*
  94         functions after the v4l2_subdev was registered. It is used to pass
  95         platform data to the subdev which can be used during initialization.
  96
  97    init: initialize the sensor registors to some sort of reasonable default
  98         values. Do not use for new drivers and should be removed in existing
  99         drivers.
 100
 101    load_fw: load firmware.
 102
 103    reset: generic reset command. The argument selects which subsystems to
 104         reset. Passing 0 will always reset the whole chip. Do not use for new
 105         drivers without discussing this first on the linux-media mailinglist.
 106         There should be no reason normally to reset a device.
 107
 108    s_gpio: set GPIO pins. Very simple right now, might need to be extended with
 109         a direction argument if needed.
 110
 111    s_power: puts subdevice in power saving mode (on == 0) or normal operation
 112         mode (on == 1).
 113  */
 114 struct v4l2_subdev_core_ops {
 115         int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip);
 116         int (*log_status)(struct v4l2_subdev *sd);
 117         int (*s_config)(struct v4l2_subdev *sd, int irq, void *platform_data);
 118         int (*init)(struct v4l2_subdev *sd, u32 val);
 119         int (*load_fw)(struct v4l2_subdev *sd);
 120         int (*reset)(struct v4l2_subdev *sd, u32 val);
 121         int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
 122         int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
 123         int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
 124         int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
 125         int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
 126         int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
 127         int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
 128         int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
 129         int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
 130         long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
 131 #ifdef CONFIG_VIDEO_ADV_DEBUG
 132         int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
 133         int (*s_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
 134 #endif
 135         int (*s_power)(struct v4l2_subdev *sd, int on);
 136 };
 137
 138 /* s_mode: switch the tuner to a specific tuner mode. Replacement of s_radio.
 139
 140    s_radio: v4l device was opened in Radio mode, to be replaced by s_mode.
 141
 142    s_type_addr: sets tuner type and its I2C addr.
 143
 144    s_config: sets tda9887 specific stuff, like port1, port2 and qss
 145  */
 146 struct v4l2_subdev_tuner_ops {
 147         int (*s_mode)(struct v4l2_subdev *sd, enum v4l2_tuner_type);
 148         int (*s_radio)(struct v4l2_subdev *sd);
 149         int (*s_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
 150         int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
 151         int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
 152         int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
 153         int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
 154         int (*s_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
 155         int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
 156         int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
 157 };
 158
 159 /* s_clock_freq: set the frequency (in Hz) of the audio clock output.
 160         Used to slave an audio processor to the video decoder, ensuring that
 161         audio and video remain synchronized. Usual values for the frequency
 162         are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
 163         -EINVAL is returned.
 164
 165    s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
 166         way to select I2S clock used by driving digital audio streams at some
 167         board designs. Usual values for the frequency are 1024000 and 2048000.
 168         If the frequency is not supported, then -EINVAL is returned.
 169
 170    s_routing: used to define the input and/or output pins of an audio chip,
 171         and any additional configuration data.
 172         Never attempt to use user-level input IDs (e.g. Composite, S-Video,
 173         Tuner) at this level. An i2c device shouldn't know about whether an
 174         input pin is connected to a Composite connector, become on another
 175         board or platform it might be connected to something else entirely.
 176         The calling driver is responsible for mapping a user-level input to
 177         the right pins on the i2c device.
 178  */
 179 struct v4l2_subdev_audio_ops {
 180         int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
 181         int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
 182         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
 183         int (*s_stream)(struct v4l2_subdev *sd, int enable);
 184 };
 185
 186 /*
 187    decode_vbi_line: video decoders that support sliced VBI need to implement
 188         this ioctl. Field p of the v4l2_sliced_vbi_line struct is set to the
 189         start of the VBI data that was generated by the decoder. The driver
 190         then parses the sliced VBI data and sets the other fields in the
 191         struct accordingly. The pointer p is updated to point to the start of
 192         the payload which can be copied verbatim into the data field of the
 193         v4l2_sliced_vbi_data struct. If no valid VBI data was found, then the
 194         type field is set to 0 on return.
 195
 196    s_vbi_data: used to generate VBI signals on a video signal.
 197         v4l2_sliced_vbi_data is filled with the data packets that should be
 198         output. Note that if you set the line field to 0, then that VBI signal
 199         is disabled. If no valid VBI data was found, then the type field is
 200         set to 0 on return.
 201
 202    g_vbi_data: used to obtain the sliced VBI packet from a readback register.
 203         Not all video decoders support this. If no data is available because
 204         the readback register contains invalid or erroneous data -EIO is
 205         returned. Note that you must fill in the 'id' member and the 'field'
 206         member (to determine whether CC data from the first or second field
 207         should be obtained).
 208
 209    s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
 210         video input devices.
 211
 212    s_crystal_freq: sets the frequency of the crystal used to generate the
 213         clocks in Hz. An extra flags field allows device specific configuration
 214         regarding clock frequency dividers, etc. If not used, then set flags
 215         to 0. If the frequency is not supported, then -EINVAL is returned.
 216
 217    g_input_status: get input status. Same as the status field in the v4l2_input
 218         struct.
 219
 220    s_routing: see s_routing in audio_ops, except this version is for video
 221         devices.
 222
 223    s_dv_preset: set dv (Digital Video) preset in the sub device. Similar to
 224         s_std()
 225
 226    query_dv_preset: query dv preset in the sub device. This is similar to
 227         querystd()
 228
 229    s_dv_timings(): Set custom dv timings in the sub device. This is used
 230         when sub device is capable of setting detailed timing information
 231         in the hardware to generate/detect the video signal.
 232
 233    g_dv_timings(): Get custom dv timings in the sub device.
 234
 235    enum_mbus_fmt: enumerate pixel formats, provided by a video data source
 236
 237    g_mbus_fmt: get the current pixel format, provided by a video data source
 238
 239    try_mbus_fmt: try to set a pixel format on a video data source
 240
 241    s_mbus_fmt: set a pixel format on a video data source
 242  */
 243 struct v4l2_subdev_video_ops {
 244         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
 245         int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
 246         int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
 247         int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
 248         int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
 249         int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
 250         int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
 251         int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
 252         int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
 253         int (*s_stream)(struct v4l2_subdev *sd, int enable);
 254         int (*enum_fmt)(struct v4l2_subdev *sd, struct v4l2_fmtdesc *fmtdesc);
 255         int (*g_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
 256         int (*try_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
 257         int (*s_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
 258         int (*cropcap)(struct v4l2_subdev *sd, struct v4l2_cropcap *cc);
 259         int (*g_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
 260         int (*s_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
 261         int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
 262         int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
 263         int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize);
 264         int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival);
 265         int (*s_dv_preset)(struct v4l2_subdev *sd,
 266                         struct v4l2_dv_preset *preset);
 267         int (*query_dv_preset)(struct v4l2_subdev *sd,
 268                         struct v4l2_dv_preset *preset);
 269         int (*s_dv_timings)(struct v4l2_subdev *sd,
 270                         struct v4l2_dv_timings *timings);
 271         int (*g_dv_timings)(struct v4l2_subdev *sd,
 272                         struct v4l2_dv_timings *timings);
 273         int (*enum_mbus_fmt)(struct v4l2_subdev *sd, int index,
 274                              enum v4l2_mbus_pixelcode *code);
 275         int (*g_mbus_fmt)(struct v4l2_subdev *sd,
 276                           struct v4l2_mbus_framefmt *fmt);
 277         int (*try_mbus_fmt)(struct v4l2_subdev *sd,
 278                             struct v4l2_mbus_framefmt *fmt);
 279         int (*s_mbus_fmt)(struct v4l2_subdev *sd,
 280                           struct v4l2_mbus_framefmt *fmt);
 281 };
 282
 283 /**
 284  * struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
 285  * @g_skip_top_lines: number of lines at the top of the image to be skipped.
 286  *                    This is needed for some sensors, which always corrupt
 287  *                    several top lines of the output image, or which send their
 288  *                    metadata in them.
 289  */
 290 struct v4l2_subdev_sensor_ops {
 291         int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
 292 };
 293
 294 /*
 295    interrupt_service_routine: Called by the bridge chip's interrupt service
 296         handler, when an IR interrupt status has be raised due to this subdev,
 297         so that this subdev can handle the details.  It may schedule work to be
 298         performed later.  It must not sleep.  *Called from an IRQ context*.
 299
 300    [rt]x_g_parameters: Get the current operating parameters and state of the
 301         the IR receiver or transmitter.
 302
 303    [rt]x_s_parameters: Set the current operating parameters and state of the
 304         the IR receiver or transmitter.  It is recommended to call
 305         [rt]x_g_parameters first to fill out the current state, and only change
 306         the fields that need to be changed.  Upon return, the actual device
 307         operating parameters and state will be returned.  Note that hardware
 308         limitations may prevent the actual settings from matching the requested
 309         settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
 310         was requested.  An exception is when the shutdown parameter is true.
 311         The last used operational parameters will be returned, but the actual
 312         state of the hardware be different to minimize power consumption and
 313         processing when shutdown is true.
 314
 315    rx_read: Reads received codes or pulse width data.
 316         The semantics are similar to a non-blocking read() call.
 317
 318    tx_write: Writes codes or pulse width data for transmission.
 319         The semantics are similar to a non-blocking write() call.
 320  */
 321
 322 enum v4l2_subdev_ir_mode {
 323         V4L2_SUBDEV_IR_MODE_PULSE_WIDTH, /* space & mark widths in nanosecs */
 324 };
 325
 326 /* Data format of data read or written for V4L2_SUBDEV_IR_MODE_PULSE_WIDTH */
 327 #define V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS       0x7fffffff
 328 #define V4L2_SUBDEV_IR_PULSE_LEVEL_MASK         0x80000000
 329 #define V4L2_SUBDEV_IR_PULSE_RX_SEQ_END         0xffffffff
 330
 331 struct v4l2_subdev_ir_parameters {
 332         /* Either Rx or Tx */
 333         unsigned int bytes_per_data_element; /* of data in read or write call */
 334         enum v4l2_subdev_ir_mode mode;
 335
 336         bool enable;
 337         bool interrupt_enable;
 338         bool shutdown; /* true: set hardware to low/no power, false: normal */
 339
 340         bool modulation;           /* true: uses carrier, false: baseband */
 341         u32 max_pulse_width;       /* ns,      valid only for baseband signal */
 342         unsigned int carrier_freq; /* Hz,      valid only for modulated signal*/
 343         unsigned int duty_cycle;   /* percent, valid only for modulated signal*/
 344         bool invert;               /* logically invert sense of mark/space */
 345
 346         /* Rx only */
 347         u32 noise_filter_min_width;       /* ns, min time of a valid pulse */
 348         unsigned int carrier_range_lower; /* Hz, valid only for modulated sig */
 349         unsigned int carrier_range_upper; /* Hz, valid only for modulated sig */
 350         u32 resolution;                   /* ns */
 351 };
 352
 353 struct v4l2_subdev_ir_ops {
 354         /* Common to receiver and transmitter */
 355         int (*interrupt_service_routine)(struct v4l2_subdev *sd,
 356                                                 u32 status, bool *handled);
 357
 358         /* Receiver */
 359         int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
 360                                 ssize_t *num);
 361
 362         int (*rx_g_parameters)(struct v4l2_subdev *sd,
 363                                 struct v4l2_subdev_ir_parameters *params);
 364         int (*rx_s_parameters)(struct v4l2_subdev *sd,
 365                                 struct v4l2_subdev_ir_parameters *params);
 366
 367         /* Transmitter */
 368         int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
 369                                 ssize_t *num);
 370
 371         int (*tx_g_parameters)(struct v4l2_subdev *sd,
 372                                 struct v4l2_subdev_ir_parameters *params);
 373         int (*tx_s_parameters)(struct v4l2_subdev *sd,
 374                                 struct v4l2_subdev_ir_parameters *params);
 375 };
 376
 377 struct v4l2_subdev_ops {
 378         const struct v4l2_subdev_core_ops       *core;
 379         const struct v4l2_subdev_tuner_ops      *tuner;
 380         const struct v4l2_subdev_audio_ops      *audio;
 381         const struct v4l2_subdev_video_ops      *video;
 382         const struct v4l2_subdev_ir_ops         *ir;
 383         const struct v4l2_subdev_sensor_ops     *sensor;
 384 };
 385
 386 #define V4L2_SUBDEV_NAME_SIZE 32
 387
 388 /* Set this flag if this subdev is a i2c device. */
 389 #define V4L2_SUBDEV_FL_IS_I2C (1U << 0)
 390
 391 /* Each instance of a subdev driver should create this struct, either
 392    stand-alone or embedded in a larger struct.
 393  */
 394 struct v4l2_subdev {
 395         struct list_head list;
 396         struct module *owner;
 397         u32 flags;
 398         struct v4l2_device *v4l2_dev;
 399         const struct v4l2_subdev_ops *ops;
 400         /* name must be unique */
 401         char name[V4L2_SUBDEV_NAME_SIZE];
 402         /* can be used to group similar subdevs, value is driver-specific */
 403         u32 grp_id;
 404         /* pointer to private data */
 405         void *priv;
 406 };
 407
 408 static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
 409 {
 410         sd->priv = p;
 411 }
 412
 413 static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
 414 {
 415         return sd->priv;
 416 }
 417
 418 static inline void v4l2_subdev_init(struct v4l2_subdev *sd,
 419                                         const struct v4l2_subdev_ops *ops)
 420 {
 421         INIT_LIST_HEAD(&sd->list);
 422         /* ops->core MUST be set */
 423         BUG_ON(!ops || !ops->core);
 424         sd->ops = ops;
 425         sd->v4l2_dev = NULL;
 426         sd->flags = 0;
 427         sd->name[0] = '\0';
 428         sd->grp_id = 0;
 429         sd->priv = NULL;
 430 }
 431
 432 /* Call an ops of a v4l2_subdev, doing the right checks against
 433    NULL pointers.
 434
 435    Example: err = v4l2_subdev_call(sd, core, g_chip_ident, &chip);
 436  */
 437 #define v4l2_subdev_call(sd, o, f, args...)                             \
 438         (!(sd) ? -ENODEV : (((sd)->ops->o && (sd)->ops->o->f) ? \
 439                 (sd)->ops->o->f((sd) , ##args) : -ENOIOCTLCMD))
 440
 441 /* Send a notification to v4l2_device. */
 442 #define v4l2_subdev_notify(sd, notification, arg)                          \
 443         ((!(sd) || !(sd)->v4l2_dev || !(sd)->v4l2_dev->notify) ? -ENODEV : \
 444          (sd)->v4l2_dev->notify((sd), (notification), (arg)))
 445
 446 #endif