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Linux/include/media/v4l2-subdev.h

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  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/types.h>
 25 #include <linux/v4l2-subdev.h>
 26 #include <media/media-entity.h>
 27 #include <media/v4l2-async.h>
 28 #include <media/v4l2-common.h>
 29 #include <media/v4l2-dev.h>
 30 #include <media/v4l2-fh.h>
 31 #include <media/v4l2-mediabus.h>
 32 
 33 /* generic v4l2_device notify callback notification values */
 34 #define V4L2_SUBDEV_IR_RX_NOTIFY                _IOW('v', 0, u32)
 35 #define V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ      0x00000001
 36 #define V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED    0x00000002
 37 #define V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN       0x00000004
 38 #define V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN       0x00000008
 39 
 40 #define V4L2_SUBDEV_IR_TX_NOTIFY                _IOW('v', 1, u32)
 41 #define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ      0x00000001
 42 
 43 struct v4l2_device;
 44 struct v4l2_ctrl_handler;
 45 struct v4l2_event_subscription;
 46 struct v4l2_fh;
 47 struct v4l2_subdev;
 48 struct v4l2_subdev_fh;
 49 struct tuner_setup;
 50 struct v4l2_mbus_frame_desc;
 51 
 52 /* decode_vbi_line */
 53 struct v4l2_decode_vbi_line {
 54         u32 is_second_field;    /* Set to 0 for the first (odd) field,
 55                                    set to 1 for the second (even) field. */
 56         u8 *p;                  /* Pointer to the sliced VBI data from the decoder.
 57                                    On exit points to the start of the payload. */
 58         u32 line;               /* Line number of the sliced VBI data (1-23) */
 59         u32 type;               /* VBI service type (V4L2_SLICED_*). 0 if no service found */
 60 };
 61 
 62 /* Sub-devices are devices that are connected somehow to the main bridge
 63    device. These devices are usually audio/video muxers/encoders/decoders or
 64    sensors and webcam controllers.
 65 
 66    Usually these devices are controlled through an i2c bus, but other busses
 67    may also be used.
 68 
 69    The v4l2_subdev struct provides a way of accessing these devices in a
 70    generic manner. Most operations that these sub-devices support fall in
 71    a few categories: core ops, audio ops, video ops and tuner ops.
 72 
 73    More categories can be added if needed, although this should remain a
 74    limited set (no more than approx. 8 categories).
 75 
 76    Each category has its own set of ops that subdev drivers can implement.
 77 
 78    A subdev driver can leave the pointer to the category ops NULL if
 79    it does not implement them (e.g. an audio subdev will generally not
 80    implement the video category ops). The exception is the core category:
 81    this must always be present.
 82 
 83    These ops are all used internally so it is no problem to change, remove
 84    or add ops or move ops from one to another category. Currently these
 85    ops are based on the original ioctls, but since ops are not limited to
 86    one argument there is room for improvement here once all i2c subdev
 87    drivers are converted to use these ops.
 88  */
 89 
 90 /* Core ops: it is highly recommended to implement at least these ops:
 91 
 92    log_status
 93    g_register
 94    s_register
 95 
 96    This provides basic debugging support.
 97 
 98    The ioctl ops is meant for generic ioctl-like commands. Depending on
 99    the use-case it might be better to use subdev-specific ops (currently
100    not yet implemented) since ops provide proper type-checking.
101  */
102 
103 /* Subdevice external IO pin configuration */
104 #define V4L2_SUBDEV_IO_PIN_DISABLE      (1 << 0) /* ENABLE assumed */
105 #define V4L2_SUBDEV_IO_PIN_OUTPUT       (1 << 1)
106 #define V4L2_SUBDEV_IO_PIN_INPUT        (1 << 2)
107 #define V4L2_SUBDEV_IO_PIN_SET_VALUE    (1 << 3) /* Set output value */
108 #define V4L2_SUBDEV_IO_PIN_ACTIVE_LOW   (1 << 4) /* ACTIVE HIGH assumed */
109 
110 struct v4l2_subdev_io_pin_config {
111         u32 flags;      /* V4L2_SUBDEV_IO_PIN_* flags for this pin's config */
112         u8 pin;         /* Chip external IO pin to configure */
113         u8 function;    /* Internal signal pad/function to route to IO pin */
114         u8 value;       /* Initial value for pin - e.g. GPIO output value */
115         u8 strength;    /* Pin drive strength */
116 };
117 
118 /*
119    s_io_pin_config: configure one or more chip I/O pins for chips that
120         multiplex different internal signal pads out to IO pins.  This function
121         takes a pointer to an array of 'n' pin configuration entries, one for
122         each pin being configured.  This function could be called at times
123         other than just subdevice initialization.
124 
125    init: initialize the sensor registers to some sort of reasonable default
126         values. Do not use for new drivers and should be removed in existing
127         drivers.
128 
129    load_fw: load firmware.
130 
131    reset: generic reset command. The argument selects which subsystems to
132         reset. Passing 0 will always reset the whole chip. Do not use for new
133         drivers without discussing this first on the linux-media mailinglist.
134         There should be no reason normally to reset a device.
135 
136    s_gpio: set GPIO pins. Very simple right now, might need to be extended with
137         a direction argument if needed.
138 
139    s_power: puts subdevice in power saving mode (on == 0) or normal operation
140         mode (on == 1).
141 
142    interrupt_service_routine: Called by the bridge chip's interrupt service
143         handler, when an interrupt status has be raised due to this subdev,
144         so that this subdev can handle the details.  It may schedule work to be
145         performed later.  It must not sleep.  *Called from an IRQ context*.
146  */
147 struct v4l2_subdev_core_ops {
148         int (*log_status)(struct v4l2_subdev *sd);
149         int (*s_io_pin_config)(struct v4l2_subdev *sd, size_t n,
150                                       struct v4l2_subdev_io_pin_config *pincfg);
151         int (*init)(struct v4l2_subdev *sd, u32 val);
152         int (*load_fw)(struct v4l2_subdev *sd);
153         int (*reset)(struct v4l2_subdev *sd, u32 val);
154         int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
155         int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
156         int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
157         int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
158         int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
159         int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
160         int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
161         int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
162         long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
163 #ifdef CONFIG_COMPAT
164         long (*compat_ioctl32)(struct v4l2_subdev *sd, unsigned int cmd,
165                                unsigned long arg);
166 #endif
167 #ifdef CONFIG_VIDEO_ADV_DEBUG
168         int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
169         int (*s_register)(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg);
170 #endif
171         int (*s_power)(struct v4l2_subdev *sd, int on);
172         int (*interrupt_service_routine)(struct v4l2_subdev *sd,
173                                                 u32 status, bool *handled);
174         int (*subscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
175                                struct v4l2_event_subscription *sub);
176         int (*unsubscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
177                                  struct v4l2_event_subscription *sub);
178 };
179 
180 /* s_radio: v4l device was opened in radio mode.
181 
182    g_frequency: freq->type must be filled in. Normally done by video_ioctl2
183         or the bridge driver.
184 
185    g_tuner:
186    s_tuner: vt->type must be filled in. Normally done by video_ioctl2 or the
187         bridge driver.
188 
189    s_type_addr: sets tuner type and its I2C addr.
190 
191    s_config: sets tda9887 specific stuff, like port1, port2 and qss
192  */
193 struct v4l2_subdev_tuner_ops {
194         int (*s_radio)(struct v4l2_subdev *sd);
195         int (*s_frequency)(struct v4l2_subdev *sd, const struct v4l2_frequency *freq);
196         int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
197         int (*enum_freq_bands)(struct v4l2_subdev *sd, struct v4l2_frequency_band *band);
198         int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
199         int (*s_tuner)(struct v4l2_subdev *sd, const struct v4l2_tuner *vt);
200         int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
201         int (*s_modulator)(struct v4l2_subdev *sd, const struct v4l2_modulator *vm);
202         int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
203         int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
204 };
205 
206 /* s_clock_freq: set the frequency (in Hz) of the audio clock output.
207         Used to slave an audio processor to the video decoder, ensuring that
208         audio and video remain synchronized. Usual values for the frequency
209         are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
210         -EINVAL is returned.
211 
212    s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
213         way to select I2S clock used by driving digital audio streams at some
214         board designs. Usual values for the frequency are 1024000 and 2048000.
215         If the frequency is not supported, then -EINVAL is returned.
216 
217    s_routing: used to define the input and/or output pins of an audio chip,
218         and any additional configuration data.
219         Never attempt to use user-level input IDs (e.g. Composite, S-Video,
220         Tuner) at this level. An i2c device shouldn't know about whether an
221         input pin is connected to a Composite connector, become on another
222         board or platform it might be connected to something else entirely.
223         The calling driver is responsible for mapping a user-level input to
224         the right pins on the i2c device.
225  */
226 struct v4l2_subdev_audio_ops {
227         int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
228         int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
229         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
230         int (*s_stream)(struct v4l2_subdev *sd, int enable);
231 };
232 
233 /* Indicates the @length field specifies maximum data length. */
234 #define V4L2_MBUS_FRAME_DESC_FL_LEN_MAX         (1U << 0)
235 /*
236  * Indicates that the format does not have line offsets, i.e. the
237  * receiver should use 1D DMA.
238  */
239 #define V4L2_MBUS_FRAME_DESC_FL_BLOB            (1U << 1)
240 
241 /**
242  * struct v4l2_mbus_frame_desc_entry - media bus frame description structure
243  * @flags: V4L2_MBUS_FRAME_DESC_FL_* flags
244  * @pixelcode: media bus pixel code, valid if FRAME_DESC_FL_BLOB is not set
245  * @length: number of octets per frame, valid if V4L2_MBUS_FRAME_DESC_FL_BLOB
246  *          is set
247  */
248 struct v4l2_mbus_frame_desc_entry {
249         u16 flags;
250         u32 pixelcode;
251         u32 length;
252 };
253 
254 #define V4L2_FRAME_DESC_ENTRY_MAX       4
255 
256 /**
257  * struct v4l2_mbus_frame_desc - media bus data frame description
258  * @entry: frame descriptors array
259  * @num_entries: number of entries in @entry array
260  */
261 struct v4l2_mbus_frame_desc {
262         struct v4l2_mbus_frame_desc_entry entry[V4L2_FRAME_DESC_ENTRY_MAX];
263         unsigned short num_entries;
264 };
265 
266 /*
267    s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
268         video input devices.
269 
270    g_std_output: get current standard for video OUTPUT devices. This is ignored
271         by video input devices.
272 
273    g_tvnorms: get v4l2_std_id with all standards supported by the video
274         CAPTURE device. This is ignored by video output devices.
275 
276    g_tvnorms_output: get v4l2_std_id with all standards supported by the video
277         OUTPUT device. This is ignored by video capture devices.
278 
279    s_crystal_freq: sets the frequency of the crystal used to generate the
280         clocks in Hz. An extra flags field allows device specific configuration
281         regarding clock frequency dividers, etc. If not used, then set flags
282         to 0. If the frequency is not supported, then -EINVAL is returned.
283 
284    g_input_status: get input status. Same as the status field in the v4l2_input
285         struct.
286 
287    s_routing: see s_routing in audio_ops, except this version is for video
288         devices.
289 
290    s_dv_timings(): Set custom dv timings in the sub device. This is used
291         when sub device is capable of setting detailed timing information
292         in the hardware to generate/detect the video signal.
293 
294    g_dv_timings(): Get custom dv timings in the sub device.
295 
296    enum_mbus_fmt: enumerate pixel formats, provided by a video data source
297 
298    g_mbus_fmt: get the current pixel format, provided by a video data source
299 
300    try_mbus_fmt: try to set a pixel format on a video data source
301 
302    s_mbus_fmt: set a pixel format on a video data source
303 
304    g_mbus_config: get supported mediabus configurations
305 
306    s_mbus_config: set a certain mediabus configuration. This operation is added
307         for compatibility with soc-camera drivers and should not be used by new
308         software.
309 
310    s_rx_buffer: set a host allocated memory buffer for the subdev. The subdev
311         can adjust @size to a lower value and must not write more data to the
312         buffer starting at @data than the original value of @size.
313  */
314 struct v4l2_subdev_video_ops {
315         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
316         int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
317         int (*g_std)(struct v4l2_subdev *sd, v4l2_std_id *norm);
318         int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
319         int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
320         int (*g_std_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
321         int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
322         int (*g_tvnorms)(struct v4l2_subdev *sd, v4l2_std_id *std);
323         int (*g_tvnorms_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
324         int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
325         int (*s_stream)(struct v4l2_subdev *sd, int enable);
326         int (*cropcap)(struct v4l2_subdev *sd, struct v4l2_cropcap *cc);
327         int (*g_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
328         int (*s_crop)(struct v4l2_subdev *sd, const struct v4l2_crop *crop);
329         int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
330         int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
331         int (*g_frame_interval)(struct v4l2_subdev *sd,
332                                 struct v4l2_subdev_frame_interval *interval);
333         int (*s_frame_interval)(struct v4l2_subdev *sd,
334                                 struct v4l2_subdev_frame_interval *interval);
335         int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize);
336         int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival);
337         int (*s_dv_timings)(struct v4l2_subdev *sd,
338                         struct v4l2_dv_timings *timings);
339         int (*g_dv_timings)(struct v4l2_subdev *sd,
340                         struct v4l2_dv_timings *timings);
341         int (*query_dv_timings)(struct v4l2_subdev *sd,
342                         struct v4l2_dv_timings *timings);
343         int (*enum_mbus_fmt)(struct v4l2_subdev *sd, unsigned int index,
344                              u32 *code);
345         int (*g_mbus_fmt)(struct v4l2_subdev *sd,
346                           struct v4l2_mbus_framefmt *fmt);
347         int (*try_mbus_fmt)(struct v4l2_subdev *sd,
348                             struct v4l2_mbus_framefmt *fmt);
349         int (*s_mbus_fmt)(struct v4l2_subdev *sd,
350                           struct v4l2_mbus_framefmt *fmt);
351         int (*g_mbus_config)(struct v4l2_subdev *sd,
352                              struct v4l2_mbus_config *cfg);
353         int (*s_mbus_config)(struct v4l2_subdev *sd,
354                              const struct v4l2_mbus_config *cfg);
355         int (*s_rx_buffer)(struct v4l2_subdev *sd, void *buf,
356                            unsigned int *size);
357 };
358 
359 /*
360    decode_vbi_line: video decoders that support sliced VBI need to implement
361         this ioctl. Field p of the v4l2_sliced_vbi_line struct is set to the
362         start of the VBI data that was generated by the decoder. The driver
363         then parses the sliced VBI data and sets the other fields in the
364         struct accordingly. The pointer p is updated to point to the start of
365         the payload which can be copied verbatim into the data field of the
366         v4l2_sliced_vbi_data struct. If no valid VBI data was found, then the
367         type field is set to 0 on return.
368 
369    s_vbi_data: used to generate VBI signals on a video signal.
370         v4l2_sliced_vbi_data is filled with the data packets that should be
371         output. Note that if you set the line field to 0, then that VBI signal
372         is disabled. If no valid VBI data was found, then the type field is
373         set to 0 on return.
374 
375    g_vbi_data: used to obtain the sliced VBI packet from a readback register.
376         Not all video decoders support this. If no data is available because
377         the readback register contains invalid or erroneous data -EIO is
378         returned. Note that you must fill in the 'id' member and the 'field'
379         member (to determine whether CC data from the first or second field
380         should be obtained).
381 
382    s_raw_fmt: setup the video encoder/decoder for raw VBI.
383 
384    g_sliced_fmt: retrieve the current sliced VBI settings.
385 
386    s_sliced_fmt: setup the sliced VBI settings.
387  */
388 struct v4l2_subdev_vbi_ops {
389         int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
390         int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
391         int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
392         int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
393         int (*s_raw_fmt)(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt);
394         int (*g_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
395         int (*s_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
396 };
397 
398 /**
399  * struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
400  * @g_skip_top_lines: number of lines at the top of the image to be skipped.
401  *                    This is needed for some sensors, which always corrupt
402  *                    several top lines of the output image, or which send their
403  *                    metadata in them.
404  * @g_skip_frames: number of frames to skip at stream start. This is needed for
405  *                 buggy sensors that generate faulty frames when they are
406  *                 turned on.
407  */
408 struct v4l2_subdev_sensor_ops {
409         int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
410         int (*g_skip_frames)(struct v4l2_subdev *sd, u32 *frames);
411 };
412 
413 /*
414    [rt]x_g_parameters: Get the current operating parameters and state of the
415         the IR receiver or transmitter.
416 
417    [rt]x_s_parameters: Set the current operating parameters and state of the
418         the IR receiver or transmitter.  It is recommended to call
419         [rt]x_g_parameters first to fill out the current state, and only change
420         the fields that need to be changed.  Upon return, the actual device
421         operating parameters and state will be returned.  Note that hardware
422         limitations may prevent the actual settings from matching the requested
423         settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
424         was requested.  An exception is when the shutdown parameter is true.
425         The last used operational parameters will be returned, but the actual
426         state of the hardware be different to minimize power consumption and
427         processing when shutdown is true.
428 
429    rx_read: Reads received codes or pulse width data.
430         The semantics are similar to a non-blocking read() call.
431 
432    tx_write: Writes codes or pulse width data for transmission.
433         The semantics are similar to a non-blocking write() call.
434  */
435 
436 enum v4l2_subdev_ir_mode {
437         V4L2_SUBDEV_IR_MODE_PULSE_WIDTH, /* uses struct ir_raw_event records */
438 };
439 
440 struct v4l2_subdev_ir_parameters {
441         /* Either Rx or Tx */
442         unsigned int bytes_per_data_element; /* of data in read or write call */
443         enum v4l2_subdev_ir_mode mode;
444 
445         bool enable;
446         bool interrupt_enable;
447         bool shutdown; /* true: set hardware to low/no power, false: normal */
448 
449         bool modulation;           /* true: uses carrier, false: baseband */
450         u32 max_pulse_width;       /* ns,      valid only for baseband signal */
451         unsigned int carrier_freq; /* Hz,      valid only for modulated signal*/
452         unsigned int duty_cycle;   /* percent, valid only for modulated signal*/
453         bool invert_level;         /* invert signal level */
454 
455         /* Tx only */
456         bool invert_carrier_sense; /* Send 0/space as a carrier burst */
457 
458         /* Rx only */
459         u32 noise_filter_min_width;       /* ns, min time of a valid pulse */
460         unsigned int carrier_range_lower; /* Hz, valid only for modulated sig */
461         unsigned int carrier_range_upper; /* Hz, valid only for modulated sig */
462         u32 resolution;                   /* ns */
463 };
464 
465 struct v4l2_subdev_ir_ops {
466         /* Receiver */
467         int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
468                                 ssize_t *num);
469 
470         int (*rx_g_parameters)(struct v4l2_subdev *sd,
471                                 struct v4l2_subdev_ir_parameters *params);
472         int (*rx_s_parameters)(struct v4l2_subdev *sd,
473                                 struct v4l2_subdev_ir_parameters *params);
474 
475         /* Transmitter */
476         int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
477                                 ssize_t *num);
478 
479         int (*tx_g_parameters)(struct v4l2_subdev *sd,
480                                 struct v4l2_subdev_ir_parameters *params);
481         int (*tx_s_parameters)(struct v4l2_subdev *sd,
482                                 struct v4l2_subdev_ir_parameters *params);
483 };
484 
485 /**
486  * struct v4l2_subdev_pad_ops - v4l2-subdev pad level operations
487  * @get_frame_desc: get the current low level media bus frame parameters.
488  * @get_frame_desc: set the low level media bus frame parameters, @fd array
489  *                  may be adjusted by the subdev driver to device capabilities.
490  */
491 struct v4l2_subdev_pad_ops {
492         int (*enum_mbus_code)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
493                               struct v4l2_subdev_mbus_code_enum *code);
494         int (*enum_frame_size)(struct v4l2_subdev *sd,
495                                struct v4l2_subdev_fh *fh,
496                                struct v4l2_subdev_frame_size_enum *fse);
497         int (*enum_frame_interval)(struct v4l2_subdev *sd,
498                                    struct v4l2_subdev_fh *fh,
499                                    struct v4l2_subdev_frame_interval_enum *fie);
500         int (*get_fmt)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
501                        struct v4l2_subdev_format *format);
502         int (*set_fmt)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
503                        struct v4l2_subdev_format *format);
504         int (*get_selection)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
505                              struct v4l2_subdev_selection *sel);
506         int (*set_selection)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
507                              struct v4l2_subdev_selection *sel);
508         int (*get_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
509         int (*set_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
510         int (*dv_timings_cap)(struct v4l2_subdev *sd,
511                               struct v4l2_dv_timings_cap *cap);
512         int (*enum_dv_timings)(struct v4l2_subdev *sd,
513                                struct v4l2_enum_dv_timings *timings);
514 #ifdef CONFIG_MEDIA_CONTROLLER
515         int (*link_validate)(struct v4l2_subdev *sd, struct media_link *link,
516                              struct v4l2_subdev_format *source_fmt,
517                              struct v4l2_subdev_format *sink_fmt);
518 #endif /* CONFIG_MEDIA_CONTROLLER */
519         int (*get_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
520                               struct v4l2_mbus_frame_desc *fd);
521         int (*set_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
522                               struct v4l2_mbus_frame_desc *fd);
523 };
524 
525 struct v4l2_subdev_ops {
526         const struct v4l2_subdev_core_ops       *core;
527         const struct v4l2_subdev_tuner_ops      *tuner;
528         const struct v4l2_subdev_audio_ops      *audio;
529         const struct v4l2_subdev_video_ops      *video;
530         const struct v4l2_subdev_vbi_ops        *vbi;
531         const struct v4l2_subdev_ir_ops         *ir;
532         const struct v4l2_subdev_sensor_ops     *sensor;
533         const struct v4l2_subdev_pad_ops        *pad;
534 };
535 
536 /*
537  * Internal ops. Never call this from drivers, only the v4l2 framework can call
538  * these ops.
539  *
540  * registered: called when this subdev is registered. When called the v4l2_dev
541  *      field is set to the correct v4l2_device.
542  *
543  * unregistered: called when this subdev is unregistered. When called the
544  *      v4l2_dev field is still set to the correct v4l2_device.
545  *
546  * open: called when the subdev device node is opened by an application.
547  *
548  * close: called when the subdev device node is closed.
549  */
550 struct v4l2_subdev_internal_ops {
551         int (*registered)(struct v4l2_subdev *sd);
552         void (*unregistered)(struct v4l2_subdev *sd);
553         int (*open)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
554         int (*close)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
555 };
556 
557 #define V4L2_SUBDEV_NAME_SIZE 32
558 
559 /* Set this flag if this subdev is a i2c device. */
560 #define V4L2_SUBDEV_FL_IS_I2C                   (1U << 0)
561 /* Set this flag if this subdev is a spi device. */
562 #define V4L2_SUBDEV_FL_IS_SPI                   (1U << 1)
563 /* Set this flag if this subdev needs a device node. */
564 #define V4L2_SUBDEV_FL_HAS_DEVNODE              (1U << 2)
565 /* Set this flag if this subdev generates events. */
566 #define V4L2_SUBDEV_FL_HAS_EVENTS               (1U << 3)
567 
568 struct regulator_bulk_data;
569 
570 struct v4l2_subdev_platform_data {
571         /* Optional regulators uset to power on/off the subdevice */
572         struct regulator_bulk_data *regulators;
573         int num_regulators;
574 
575         /* Per-subdevice data, specific for a certain video host device */
576         void *host_priv;
577 };
578 
579 /* Each instance of a subdev driver should create this struct, either
580    stand-alone or embedded in a larger struct.
581  */
582 struct v4l2_subdev {
583 #if defined(CONFIG_MEDIA_CONTROLLER)
584         struct media_entity entity;
585 #endif
586         struct list_head list;
587         struct module *owner;
588         bool owner_v4l2_dev;
589         u32 flags;
590         struct v4l2_device *v4l2_dev;
591         const struct v4l2_subdev_ops *ops;
592         /* Never call these internal ops from within a driver! */
593         const struct v4l2_subdev_internal_ops *internal_ops;
594         /* The control handler of this subdev. May be NULL. */
595         struct v4l2_ctrl_handler *ctrl_handler;
596         /* name must be unique */
597         char name[V4L2_SUBDEV_NAME_SIZE];
598         /* can be used to group similar subdevs, value is driver-specific */
599         u32 grp_id;
600         /* pointer to private data */
601         void *dev_priv;
602         void *host_priv;
603         /* subdev device node */
604         struct video_device *devnode;
605         /* pointer to the physical device, if any */
606         struct device *dev;
607         /* Links this subdev to a global subdev_list or @notifier->done list. */
608         struct list_head async_list;
609         /* Pointer to respective struct v4l2_async_subdev. */
610         struct v4l2_async_subdev *asd;
611         /* Pointer to the managing notifier. */
612         struct v4l2_async_notifier *notifier;
613         /* common part of subdevice platform data */
614         struct v4l2_subdev_platform_data *pdata;
615 };
616 
617 #define media_entity_to_v4l2_subdev(ent) \
618         container_of(ent, struct v4l2_subdev, entity)
619 #define vdev_to_v4l2_subdev(vdev) \
620         ((struct v4l2_subdev *)video_get_drvdata(vdev))
621 
622 /*
623  * Used for storing subdev information per file handle
624  */
625 struct v4l2_subdev_fh {
626         struct v4l2_fh vfh;
627 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
628         struct {
629                 struct v4l2_mbus_framefmt try_fmt;
630                 struct v4l2_rect try_crop;
631                 struct v4l2_rect try_compose;
632         } *pad;
633 #endif
634 };
635 
636 #define to_v4l2_subdev_fh(fh)   \
637         container_of(fh, struct v4l2_subdev_fh, vfh)
638 
639 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
640 #define __V4L2_SUBDEV_MK_GET_TRY(rtype, fun_name, field_name)           \
641         static inline struct rtype *                                    \
642         v4l2_subdev_get_try_##fun_name(struct v4l2_subdev_fh *fh,       \
643                                        unsigned int pad)                \
644         {                                                               \
645                 BUG_ON(pad >= vdev_to_v4l2_subdev(                      \
646                                         fh->vfh.vdev)->entity.num_pads); \
647                 return &fh->pad[pad].field_name;                        \
648         }
649 
650 __V4L2_SUBDEV_MK_GET_TRY(v4l2_mbus_framefmt, format, try_fmt)
651 __V4L2_SUBDEV_MK_GET_TRY(v4l2_rect, crop, try_crop)
652 __V4L2_SUBDEV_MK_GET_TRY(v4l2_rect, compose, try_compose)
653 #endif
654 
655 extern const struct v4l2_file_operations v4l2_subdev_fops;
656 
657 static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
658 {
659         sd->dev_priv = p;
660 }
661 
662 static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
663 {
664         return sd->dev_priv;
665 }
666 
667 static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p)
668 {
669         sd->host_priv = p;
670 }
671 
672 static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
673 {
674         return sd->host_priv;
675 }
676 
677 #ifdef CONFIG_MEDIA_CONTROLLER
678 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
679                                       struct media_link *link,
680                                       struct v4l2_subdev_format *source_fmt,
681                                       struct v4l2_subdev_format *sink_fmt);
682 int v4l2_subdev_link_validate(struct media_link *link);
683 #endif /* CONFIG_MEDIA_CONTROLLER */
684 void v4l2_subdev_init(struct v4l2_subdev *sd,
685                       const struct v4l2_subdev_ops *ops);
686 
687 /* Call an ops of a v4l2_subdev, doing the right checks against
688    NULL pointers.
689 
690    Example: err = v4l2_subdev_call(sd, video, s_std, norm);
691  */
692 #define v4l2_subdev_call(sd, o, f, args...)                             \
693         (!(sd) ? -ENODEV : (((sd)->ops->o && (sd)->ops->o->f) ? \
694                 (sd)->ops->o->f((sd) , ##args) : -ENOIOCTLCMD))
695 
696 #define v4l2_subdev_has_op(sd, o, f) \
697         ((sd)->ops->o && (sd)->ops->o->f)
698 
699 #endif
700 

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