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TOMOYO Linux Cross Reference
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 
 17 #ifndef _V4L2_SUBDEV_H
 18 #define _V4L2_SUBDEV_H
 19 
 20 #include <linux/types.h>
 21 #include <linux/v4l2-subdev.h>
 22 #include <media/media-entity.h>
 23 #include <media/v4l2-async.h>
 24 #include <media/v4l2-common.h>
 25 #include <media/v4l2-dev.h>
 26 #include <media/v4l2-fh.h>
 27 #include <media/v4l2-mediabus.h>
 28 
 29 /* generic v4l2_device notify callback notification values */
 30 #define V4L2_SUBDEV_IR_RX_NOTIFY                _IOW('v', 0, u32)
 31 #define V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ      0x00000001
 32 #define V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED    0x00000002
 33 #define V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN       0x00000004
 34 #define V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN       0x00000008
 35 
 36 #define V4L2_SUBDEV_IR_TX_NOTIFY                _IOW('v', 1, u32)
 37 #define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ      0x00000001
 38 
 39 #define V4L2_DEVICE_NOTIFY_EVENT                _IOW('v', 2, struct v4l2_event)
 40 
 41 struct v4l2_device;
 42 struct v4l2_ctrl_handler;
 43 struct v4l2_event;
 44 struct v4l2_event_subscription;
 45 struct v4l2_fh;
 46 struct v4l2_subdev;
 47 struct v4l2_subdev_fh;
 48 struct tuner_setup;
 49 struct v4l2_mbus_frame_desc;
 50 
 51 /**
 52  * struct v4l2_decode_vbi_line - used to decode_vbi_line
 53  *
 54  * @is_second_field: Set to 0 for the first (odd) field;
 55  *      set to 1 for the second (even) field.
 56  * @p: Pointer to the sliced VBI data from the decoder. On exit, points to
 57  *      the start of the payload.
 58  * @line: Line number of the sliced VBI data (1-23)
 59  * @type: VBI service type (V4L2_SLICED_*). 0 if no service found
 60  */
 61 struct v4l2_decode_vbi_line {
 62         u32 is_second_field;
 63         u8 *p;
 64         u32 line;
 65         u32 type;
 66 };
 67 
 68 /*
 69  * Sub-devices are devices that are connected somehow to the main bridge
 70  * device. These devices are usually audio/video muxers/encoders/decoders or
 71  * sensors and webcam controllers.
 72  *
 73  * Usually these devices are controlled through an i2c bus, but other busses
 74  * may also be used.
 75  *
 76  * The v4l2_subdev struct provides a way of accessing these devices in a
 77  * generic manner. Most operations that these sub-devices support fall in
 78  * a few categories: core ops, audio ops, video ops and tuner ops.
 79  *
 80  * More categories can be added if needed, although this should remain a
 81  * limited set (no more than approx. 8 categories).
 82  *
 83  * Each category has its own set of ops that subdev drivers can implement.
 84  *
 85  * A subdev driver can leave the pointer to the category ops NULL if
 86  * it does not implement them (e.g. an audio subdev will generally not
 87  * implement the video category ops). The exception is the core category:
 88  * this must always be present.
 89  *
 90  * These ops are all used internally so it is no problem to change, remove
 91  * or add ops or move ops from one to another category. Currently these
 92  * ops are based on the original ioctls, but since ops are not limited to
 93  * one argument there is room for improvement here once all i2c subdev
 94  * drivers are converted to use these ops.
 95  */
 96 
 97 /*
 98  * Core ops: it is highly recommended to implement at least these ops:
 99  *
100  * log_status
101  * g_register
102  * s_register
103  *
104  * This provides basic debugging support.
105  *
106  * The ioctl ops is meant for generic ioctl-like commands. Depending on
107  * the use-case it might be better to use subdev-specific ops (currently
108  * not yet implemented) since ops provide proper type-checking.
109  */
110 
111 /* Subdevice external IO pin configuration */
112 #define V4L2_SUBDEV_IO_PIN_DISABLE      (1 << 0) /* ENABLE assumed */
113 #define V4L2_SUBDEV_IO_PIN_OUTPUT       (1 << 1)
114 #define V4L2_SUBDEV_IO_PIN_INPUT        (1 << 2)
115 #define V4L2_SUBDEV_IO_PIN_SET_VALUE    (1 << 3) /* Set output value */
116 #define V4L2_SUBDEV_IO_PIN_ACTIVE_LOW   (1 << 4) /* ACTIVE HIGH assumed */
117 
118 /**
119  * struct v4l2_subdev_io_pin_config - Subdevice external IO pin configuration
120  *
121  * @flags: bitmask with flags for this pin's config:
122  *         %V4L2_SUBDEV_IO_PIN_DISABLE - disables a pin config,
123  *         %V4L2_SUBDEV_IO_PIN_OUTPUT - if pin is an output,
124  *         %V4L2_SUBDEV_IO_PIN_INPUT - if pin is an input,
125  *         %V4L2_SUBDEV_IO_PIN_SET_VALUE - to set the output value via @value
126  *         and %V4L2_SUBDEV_IO_PIN_ACTIVE_LOW - if active is 0.
127  * @pin: Chip external IO pin to configure
128  * @function: Internal signal pad/function to route to IO pin
129  * @value: Initial value for pin - e.g. GPIO output value
130  * @strength: Pin drive strength
131  */
132 struct v4l2_subdev_io_pin_config {
133         u32 flags;
134         u8 pin;
135         u8 function;
136         u8 value;
137         u8 strength;
138 };
139 
140 /**
141  * struct v4l2_subdev_core_ops - Define core ops callbacks for subdevs
142  *
143  * @log_status: callback for %VIDIOC_LOG_STATUS ioctl handler code.
144  *
145  * @s_io_pin_config: configure one or more chip I/O pins for chips that
146  *      multiplex different internal signal pads out to IO pins.  This function
147  *      takes a pointer to an array of 'n' pin configuration entries, one for
148  *      each pin being configured.  This function could be called at times
149  *      other than just subdevice initialization.
150  *
151  * @init: initialize the sensor registers to some sort of reasonable default
152  *      values. Do not use for new drivers and should be removed in existing
153  *      drivers.
154  *
155  * @load_fw: load firmware.
156  *
157  * @reset: generic reset command. The argument selects which subsystems to
158  *      reset. Passing 0 will always reset the whole chip. Do not use for new
159  *      drivers without discussing this first on the linux-media mailinglist.
160  *      There should be no reason normally to reset a device.
161  *
162  * @s_gpio: set GPIO pins. Very simple right now, might need to be extended with
163  *      a direction argument if needed.
164  *
165  * @ioctl: called at the end of ioctl() syscall handler at the V4L2 core.
166  *         used to provide support for private ioctls used on the driver.
167  *
168  * @compat_ioctl32: called when a 32 bits application uses a 64 bits Kernel,
169  *                  in order to fix data passed from/to userspace.
170  *
171  * @g_register: callback for %VIDIOC_G_REGISTER ioctl handler code.
172  *
173  * @s_register: callback for %VIDIOC_G_REGISTER ioctl handler code.
174  *
175  * @s_power: puts subdevice in power saving mode (on == 0) or normal operation
176  *      mode (on == 1).
177  *
178  * @interrupt_service_routine: Called by the bridge chip's interrupt service
179  *      handler, when an interrupt status has be raised due to this subdev,
180  *      so that this subdev can handle the details.  It may schedule work to be
181  *      performed later.  It must not sleep. **Called from an IRQ context**.
182  *
183  * @subscribe_event: used by the drivers to request the control framework that
184  *                   for it to be warned when the value of a control changes.
185  *
186  * @unsubscribe_event: remove event subscription from the control framework.
187  */
188 struct v4l2_subdev_core_ops {
189         int (*log_status)(struct v4l2_subdev *sd);
190         int (*s_io_pin_config)(struct v4l2_subdev *sd, size_t n,
191                                       struct v4l2_subdev_io_pin_config *pincfg);
192         int (*init)(struct v4l2_subdev *sd, u32 val);
193         int (*load_fw)(struct v4l2_subdev *sd);
194         int (*reset)(struct v4l2_subdev *sd, u32 val);
195         int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
196         long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
197 #ifdef CONFIG_COMPAT
198         long (*compat_ioctl32)(struct v4l2_subdev *sd, unsigned int cmd,
199                                unsigned long arg);
200 #endif
201 #ifdef CONFIG_VIDEO_ADV_DEBUG
202         int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
203         int (*s_register)(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg);
204 #endif
205         int (*s_power)(struct v4l2_subdev *sd, int on);
206         int (*interrupt_service_routine)(struct v4l2_subdev *sd,
207                                                 u32 status, bool *handled);
208         int (*subscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
209                                struct v4l2_event_subscription *sub);
210         int (*unsubscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
211                                  struct v4l2_event_subscription *sub);
212 };
213 
214 /**
215  * struct v4l2_subdev_tuner_ops - Callbacks used when v4l device was opened
216  *      in radio mode.
217  *
218  * @s_radio: callback for %VIDIOC_S_RADIO ioctl handler code.
219  *
220  * @s_frequency: callback for %VIDIOC_S_FREQUENCY ioctl handler code.
221  *
222  * @g_frequency: callback for %VIDIOC_G_FREQUENCY ioctl handler code.
223  *               freq->type must be filled in. Normally done by video_ioctl2()
224  *               or the bridge driver.
225  *
226  * @enum_freq_bands: callback for %VIDIOC_ENUM_FREQ_BANDS ioctl handler code.
227  *
228  * @g_tuner: callback for %VIDIOC_G_TUNER ioctl handler code.
229  *
230  * @s_tuner: callback for %VIDIOC_S_TUNER ioctl handler code. @vt->type must be
231  *           filled in. Normally done by video_ioctl2 or the
232  *           bridge driver.
233  *
234  * @g_modulator: callback for %VIDIOC_G_MODULATOR ioctl handler code.
235  *
236  * @s_modulator: callback for %VIDIOC_S_MODULATOR ioctl handler code.
237  *
238  * @s_type_addr: sets tuner type and its I2C addr.
239  *
240  * @s_config: sets tda9887 specific stuff, like port1, port2 and qss
241  */
242 struct v4l2_subdev_tuner_ops {
243         int (*s_radio)(struct v4l2_subdev *sd);
244         int (*s_frequency)(struct v4l2_subdev *sd, const struct v4l2_frequency *freq);
245         int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
246         int (*enum_freq_bands)(struct v4l2_subdev *sd, struct v4l2_frequency_band *band);
247         int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
248         int (*s_tuner)(struct v4l2_subdev *sd, const struct v4l2_tuner *vt);
249         int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
250         int (*s_modulator)(struct v4l2_subdev *sd, const struct v4l2_modulator *vm);
251         int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
252         int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
253 };
254 
255 /**
256  * struct v4l2_subdev_audio_ops - Callbacks used for audio-related settings
257  *
258  * @s_clock_freq: set the frequency (in Hz) of the audio clock output.
259  *      Used to slave an audio processor to the video decoder, ensuring that
260  *      audio and video remain synchronized. Usual values for the frequency
261  *      are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
262  *      -EINVAL is returned.
263  *
264  * @s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
265  *      way to select I2S clock used by driving digital audio streams at some
266  *      board designs. Usual values for the frequency are 1024000 and 2048000.
267  *      If the frequency is not supported, then %-EINVAL is returned.
268  *
269  * @s_routing: used to define the input and/or output pins of an audio chip,
270  *      and any additional configuration data.
271  *      Never attempt to use user-level input IDs (e.g. Composite, S-Video,
272  *      Tuner) at this level. An i2c device shouldn't know about whether an
273  *      input pin is connected to a Composite connector, become on another
274  *      board or platform it might be connected to something else entirely.
275  *      The calling driver is responsible for mapping a user-level input to
276  *      the right pins on the i2c device.
277  *
278  * @s_stream: used to notify the audio code that stream will start or has
279  *      stopped.
280  */
281 struct v4l2_subdev_audio_ops {
282         int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
283         int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
284         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
285         int (*s_stream)(struct v4l2_subdev *sd, int enable);
286 };
287 
288 /* Indicates the @length field specifies maximum data length. */
289 #define V4L2_MBUS_FRAME_DESC_FL_LEN_MAX         (1U << 0)
290 /*
291  * Indicates that the format does not have line offsets, i.e. the
292  * receiver should use 1D DMA.
293  */
294 #define V4L2_MBUS_FRAME_DESC_FL_BLOB            (1U << 1)
295 
296 /**
297  * struct v4l2_mbus_frame_desc_entry - media bus frame description structure
298  *
299  * @flags: bitmask flags: %V4L2_MBUS_FRAME_DESC_FL_LEN_MAX and
300  *                        %V4L2_MBUS_FRAME_DESC_FL_BLOB.
301  * @pixelcode: media bus pixel code, valid if FRAME_DESC_FL_BLOB is not set
302  * @length: number of octets per frame, valid if V4L2_MBUS_FRAME_DESC_FL_BLOB
303  *          is set
304  */
305 struct v4l2_mbus_frame_desc_entry {
306         u16 flags;
307         u32 pixelcode;
308         u32 length;
309 };
310 
311 #define V4L2_FRAME_DESC_ENTRY_MAX       4
312 
313 /**
314  * struct v4l2_mbus_frame_desc - media bus data frame description
315  * @entry: frame descriptors array
316  * @num_entries: number of entries in @entry array
317  */
318 struct v4l2_mbus_frame_desc {
319         struct v4l2_mbus_frame_desc_entry entry[V4L2_FRAME_DESC_ENTRY_MAX];
320         unsigned short num_entries;
321 };
322 
323 /**
324  * struct v4l2_subdev_video_ops - Callbacks used when v4l device was opened
325  *                                in video mode.
326  *
327  * @s_routing: see s_routing in audio_ops, except this version is for video
328  *      devices.
329  *
330  * @s_crystal_freq: sets the frequency of the crystal used to generate the
331  *      clocks in Hz. An extra flags field allows device specific configuration
332  *      regarding clock frequency dividers, etc. If not used, then set flags
333  *      to 0. If the frequency is not supported, then -EINVAL is returned.
334  *
335  * @g_std: callback for %VIDIOC_G_STD ioctl handler code.
336  *
337  * @s_std: callback for %VIDIOC_S_STD ioctl handler code.
338  *
339  * @s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
340  *      video input devices.
341  *
342  * @g_std_output: get current standard for video OUTPUT devices. This is ignored
343  *      by video input devices.
344  *
345  * @querystd: callback for %VIDIOC_QUERYSTD ioctl handler code.
346  *
347  * @g_tvnorms: get &v4l2_std_id with all standards supported by the video
348  *      CAPTURE device. This is ignored by video output devices.
349  *
350  * @g_tvnorms_output: get v4l2_std_id with all standards supported by the video
351  *      OUTPUT device. This is ignored by video capture devices.
352  *
353  * @g_input_status: get input status. Same as the status field in the
354  *      &struct &v4l2_input
355  *
356  * @s_stream: used to notify the driver that a video stream will start or has
357  *      stopped.
358  *
359  * @g_pixelaspect: callback to return the pixelaspect ratio.
360  *
361  * @g_parm: callback for %VIDIOC_G_PARM ioctl handler code.
362  *
363  * @s_parm: callback for %VIDIOC_S_PARM ioctl handler code.
364  *
365  * @g_frame_interval: callback for %VIDIOC_G_FRAMEINTERVAL ioctl handler code.
366  *
367  * @s_frame_interval: callback for %VIDIOC_S_FRAMEINTERVAL ioctl handler code.
368  *
369  * @s_dv_timings: Set custom dv timings in the sub device. This is used
370  *      when sub device is capable of setting detailed timing information
371  *      in the hardware to generate/detect the video signal.
372  *
373  * @g_dv_timings: Get custom dv timings in the sub device.
374  *
375  * @query_dv_timings: callback for %VIDIOC_QUERY_DV_TIMINGS ioctl handler code.
376  *
377  * @g_mbus_config: get supported mediabus configurations
378  *
379  * @s_mbus_config: set a certain mediabus configuration. This operation is added
380  *      for compatibility with soc-camera drivers and should not be used by new
381  *      software.
382  *
383  * @s_rx_buffer: set a host allocated memory buffer for the subdev. The subdev
384  *      can adjust @size to a lower value and must not write more data to the
385  *      buffer starting at @data than the original value of @size.
386  */
387 struct v4l2_subdev_video_ops {
388         int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
389         int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
390         int (*g_std)(struct v4l2_subdev *sd, v4l2_std_id *norm);
391         int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
392         int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
393         int (*g_std_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
394         int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
395         int (*g_tvnorms)(struct v4l2_subdev *sd, v4l2_std_id *std);
396         int (*g_tvnorms_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
397         int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
398         int (*s_stream)(struct v4l2_subdev *sd, int enable);
399         int (*g_pixelaspect)(struct v4l2_subdev *sd, struct v4l2_fract *aspect);
400         int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
401         int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
402         int (*g_frame_interval)(struct v4l2_subdev *sd,
403                                 struct v4l2_subdev_frame_interval *interval);
404         int (*s_frame_interval)(struct v4l2_subdev *sd,
405                                 struct v4l2_subdev_frame_interval *interval);
406         int (*s_dv_timings)(struct v4l2_subdev *sd,
407                         struct v4l2_dv_timings *timings);
408         int (*g_dv_timings)(struct v4l2_subdev *sd,
409                         struct v4l2_dv_timings *timings);
410         int (*query_dv_timings)(struct v4l2_subdev *sd,
411                         struct v4l2_dv_timings *timings);
412         int (*g_mbus_config)(struct v4l2_subdev *sd,
413                              struct v4l2_mbus_config *cfg);
414         int (*s_mbus_config)(struct v4l2_subdev *sd,
415                              const struct v4l2_mbus_config *cfg);
416         int (*s_rx_buffer)(struct v4l2_subdev *sd, void *buf,
417                            unsigned int *size);
418 };
419 
420 /**
421  * struct v4l2_subdev_vbi_ops - Callbacks used when v4l device was opened
422  *                                in video mode via the vbi device node.
423  *
424  *  @decode_vbi_line: video decoders that support sliced VBI need to implement
425  *      this ioctl. Field p of the &struct v4l2_decode_vbi_line is set to the
426  *      start of the VBI data that was generated by the decoder. The driver
427  *      then parses the sliced VBI data and sets the other fields in the
428  *      struct accordingly. The pointer p is updated to point to the start of
429  *      the payload which can be copied verbatim into the data field of the
430  *      &struct v4l2_sliced_vbi_data. If no valid VBI data was found, then the
431  *      type field is set to 0 on return.
432  *
433  * @s_vbi_data: used to generate VBI signals on a video signal.
434  *      &struct v4l2_sliced_vbi_data is filled with the data packets that
435  *      should be output. Note that if you set the line field to 0, then that
436  *      VBI signal is disabled. If no valid VBI data was found, then the type
437  *      field is set to 0 on return.
438  *
439  * @g_vbi_data: used to obtain the sliced VBI packet from a readback register.
440  *      Not all video decoders support this. If no data is available because
441  *      the readback register contains invalid or erroneous data %-EIO is
442  *      returned. Note that you must fill in the 'id' member and the 'field'
443  *      member (to determine whether CC data from the first or second field
444  *      should be obtained).
445  *
446  * @g_sliced_vbi_cap: callback for %VIDIOC_SLICED_VBI_CAP ioctl handler code.
447  *
448  * @s_raw_fmt: setup the video encoder/decoder for raw VBI.
449  *
450  * @g_sliced_fmt: retrieve the current sliced VBI settings.
451  *
452  * @s_sliced_fmt: setup the sliced VBI settings.
453  */
454 struct v4l2_subdev_vbi_ops {
455         int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
456         int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
457         int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
458         int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
459         int (*s_raw_fmt)(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt);
460         int (*g_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
461         int (*s_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
462 };
463 
464 /**
465  * struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
466  * @g_skip_top_lines: number of lines at the top of the image to be skipped.
467  *                    This is needed for some sensors, which always corrupt
468  *                    several top lines of the output image, or which send their
469  *                    metadata in them.
470  * @g_skip_frames: number of frames to skip at stream start. This is needed for
471  *                 buggy sensors that generate faulty frames when they are
472  *                 turned on.
473  */
474 struct v4l2_subdev_sensor_ops {
475         int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
476         int (*g_skip_frames)(struct v4l2_subdev *sd, u32 *frames);
477 };
478 
479 /**
480  * enum v4l2_subdev_ir_mode- describes the type of IR supported
481  *
482  * @V4L2_SUBDEV_IR_MODE_PULSE_WIDTH: IR uses struct ir_raw_event records
483  */
484 enum v4l2_subdev_ir_mode {
485         V4L2_SUBDEV_IR_MODE_PULSE_WIDTH,
486 };
487 
488 /**
489  * struct v4l2_subdev_ir_parameters - Parameters for IR TX or TX
490  *
491  * @bytes_per_data_element: bytes per data element of data in read or
492  *      write call.
493  * @mode: IR mode as defined by &enum v4l2_subdev_ir_mode.
494  * @enable: device is active if true
495  * @interrupt_enable: IR interrupts are enabled if true
496  * @shutdown: if true: set hardware to low/no power, false: normal mode
497  *
498  * @modulation: if true, it uses carrier, if false: baseband
499  * @max_pulse_width:  maximum pulse width in ns, valid only for baseband signal
500  * @carrier_freq: carrier frequency in Hz, valid only for modulated signal
501  * @duty_cycle: duty cycle percentage, valid only for modulated signal
502  * @invert_level: invert signal level
503  *
504  * @invert_carrier_sense: Send 0/space as a carrier burst. used only in TX.
505  *
506  * @noise_filter_min_width: min time of a valid pulse, in ns. Used only for RX.
507  * @carrier_range_lower: Lower carrier range, in Hz, valid only for modulated
508  *      signal. Used only for RX.
509  * @carrier_range_upper: Upper carrier range, in Hz, valid only for modulated
510  *      signal. Used only for RX.
511  * @resolution: The receive resolution, in ns . Used only for RX.
512  */
513 struct v4l2_subdev_ir_parameters {
514         unsigned int bytes_per_data_element;
515         enum v4l2_subdev_ir_mode mode;
516 
517         bool enable;
518         bool interrupt_enable;
519         bool shutdown;
520 
521         bool modulation;
522         u32 max_pulse_width;
523         unsigned int carrier_freq;
524         unsigned int duty_cycle;
525         bool invert_level;
526 
527         /* Tx only */
528         bool invert_carrier_sense;
529 
530         /* Rx only */
531         u32 noise_filter_min_width;
532         unsigned int carrier_range_lower;
533         unsigned int carrier_range_upper;
534         u32 resolution;
535 };
536 
537 /**
538  * struct v4l2_subdev_ir_ops - operations for IR subdevices
539  *
540  * @rx_read: Reads received codes or pulse width data.
541  *      The semantics are similar to a non-blocking read() call.
542  * @rx_g_parameters: Get the current operating parameters and state of the
543  *      the IR receiver.
544  * @rx_s_parameters: Set the current operating parameters and state of the
545  *      the IR receiver.  It is recommended to call
546  *      [rt]x_g_parameters first to fill out the current state, and only change
547  *      the fields that need to be changed.  Upon return, the actual device
548  *      operating parameters and state will be returned.  Note that hardware
549  *      limitations may prevent the actual settings from matching the requested
550  *      settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
551  *      was requested.  An exception is when the shutdown parameter is true.
552  *      The last used operational parameters will be returned, but the actual
553  *      state of the hardware be different to minimize power consumption and
554  *      processing when shutdown is true.
555  *
556  * @tx_write: Writes codes or pulse width data for transmission.
557  *      The semantics are similar to a non-blocking write() call.
558  * @tx_g_parameters: Get the current operating parameters and state of the
559  *      the IR transmitter.
560  * @tx_s_parameters: Set the current operating parameters and state of the
561  *      the IR transmitter.  It is recommended to call
562  *      [rt]x_g_parameters first to fill out the current state, and only change
563  *      the fields that need to be changed.  Upon return, the actual device
564  *      operating parameters and state will be returned.  Note that hardware
565  *      limitations may prevent the actual settings from matching the requested
566  *      settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
567  *      was requested.  An exception is when the shutdown parameter is true.
568  *      The last used operational parameters will be returned, but the actual
569  *      state of the hardware be different to minimize power consumption and
570  *      processing when shutdown is true.
571  */
572 struct v4l2_subdev_ir_ops {
573         /* Receiver */
574         int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
575                                 ssize_t *num);
576 
577         int (*rx_g_parameters)(struct v4l2_subdev *sd,
578                                 struct v4l2_subdev_ir_parameters *params);
579         int (*rx_s_parameters)(struct v4l2_subdev *sd,
580                                 struct v4l2_subdev_ir_parameters *params);
581 
582         /* Transmitter */
583         int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
584                                 ssize_t *num);
585 
586         int (*tx_g_parameters)(struct v4l2_subdev *sd,
587                                 struct v4l2_subdev_ir_parameters *params);
588         int (*tx_s_parameters)(struct v4l2_subdev *sd,
589                                 struct v4l2_subdev_ir_parameters *params);
590 };
591 
592 /**
593  * struct v4l2_subdev_pad_config - Used for storing subdev pad information.
594  *
595  * @try_fmt: &struct v4l2_mbus_framefmt
596  * @try_crop: &struct v4l2_rect to be used for crop
597  * @try_compose: &struct v4l2_rect to be used for compose
598  *
599  * This structure only needs to be passed to the pad op if the 'which' field
600  * of the main argument is set to %V4L2_SUBDEV_FORMAT_TRY. For
601  * %V4L2_SUBDEV_FORMAT_ACTIVE it is safe to pass %NULL.
602  */
603 struct v4l2_subdev_pad_config {
604         struct v4l2_mbus_framefmt try_fmt;
605         struct v4l2_rect try_crop;
606         struct v4l2_rect try_compose;
607 };
608 
609 /**
610  * struct v4l2_subdev_pad_ops - v4l2-subdev pad level operations
611  *
612  * @init_cfg: initialize the pad config to default values
613  * @enum_mbus_code: callback for %VIDIOC_SUBDEV_ENUM_MBUS_CODE ioctl handler
614  *                  code.
615  * @enum_frame_size: callback for %VIDIOC_SUBDEV_ENUM_FRAME_SIZE ioctl handler
616  *                   code.
617  *
618  * @enum_frame_interval: callback for %VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL ioctl
619  *                       handler code.
620  *
621  * @get_fmt: callback for %VIDIOC_SUBDEV_G_FMT ioctl handler code.
622  *
623  * @set_fmt: callback for %VIDIOC_SUBDEV_S_FMT ioctl handler code.
624  *
625  * @get_selection: callback for %VIDIOC_SUBDEV_G_SELECTION ioctl handler code.
626  *
627  * @set_selection: callback for %VIDIOC_SUBDEV_S_SELECTION ioctl handler code.
628  *
629  * @get_edid: callback for %VIDIOC_SUBDEV_G_EDID ioctl handler code.
630  *
631  * @set_edid: callback for %VIDIOC_SUBDEV_S_EDID ioctl handler code.
632  *
633  * @dv_timings_cap: callback for %VIDIOC_SUBDEV_DV_TIMINGS_CAP ioctl handler
634  *                  code.
635  *
636  * @enum_dv_timings: callback for %VIDIOC_SUBDEV_ENUM_DV_TIMINGS ioctl handler
637  *                   code.
638  *
639  * @link_validate: used by the media controller code to check if the links
640  *                 that belongs to a pipeline can be used for stream.
641  *
642  * @get_frame_desc: get the current low level media bus frame parameters.
643  *
644  * @set_frame_desc: set the low level media bus frame parameters, @fd array
645  *                  may be adjusted by the subdev driver to device capabilities.
646  */
647 struct v4l2_subdev_pad_ops {
648         int (*init_cfg)(struct v4l2_subdev *sd,
649                         struct v4l2_subdev_pad_config *cfg);
650         int (*enum_mbus_code)(struct v4l2_subdev *sd,
651                               struct v4l2_subdev_pad_config *cfg,
652                               struct v4l2_subdev_mbus_code_enum *code);
653         int (*enum_frame_size)(struct v4l2_subdev *sd,
654                                struct v4l2_subdev_pad_config *cfg,
655                                struct v4l2_subdev_frame_size_enum *fse);
656         int (*enum_frame_interval)(struct v4l2_subdev *sd,
657                                    struct v4l2_subdev_pad_config *cfg,
658                                    struct v4l2_subdev_frame_interval_enum *fie);
659         int (*get_fmt)(struct v4l2_subdev *sd,
660                        struct v4l2_subdev_pad_config *cfg,
661                        struct v4l2_subdev_format *format);
662         int (*set_fmt)(struct v4l2_subdev *sd,
663                        struct v4l2_subdev_pad_config *cfg,
664                        struct v4l2_subdev_format *format);
665         int (*get_selection)(struct v4l2_subdev *sd,
666                              struct v4l2_subdev_pad_config *cfg,
667                              struct v4l2_subdev_selection *sel);
668         int (*set_selection)(struct v4l2_subdev *sd,
669                              struct v4l2_subdev_pad_config *cfg,
670                              struct v4l2_subdev_selection *sel);
671         int (*get_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
672         int (*set_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
673         int (*dv_timings_cap)(struct v4l2_subdev *sd,
674                               struct v4l2_dv_timings_cap *cap);
675         int (*enum_dv_timings)(struct v4l2_subdev *sd,
676                                struct v4l2_enum_dv_timings *timings);
677 #ifdef CONFIG_MEDIA_CONTROLLER
678         int (*link_validate)(struct v4l2_subdev *sd, struct media_link *link,
679                              struct v4l2_subdev_format *source_fmt,
680                              struct v4l2_subdev_format *sink_fmt);
681 #endif /* CONFIG_MEDIA_CONTROLLER */
682         int (*get_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
683                               struct v4l2_mbus_frame_desc *fd);
684         int (*set_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
685                               struct v4l2_mbus_frame_desc *fd);
686 };
687 
688 /**
689  * struct v4l2_subdev_ops - Subdev operations
690  *
691  * @core: pointer to &struct v4l2_subdev_core_ops. Can be %NULL
692  * @tuner: pointer to &struct v4l2_subdev_tuner_ops. Can be %NULL
693  * @audio: pointer to &struct v4l2_subdev_audio_ops. Can be %NULL
694  * @video: pointer to &struct v4l2_subdev_video_ops. Can be %NULL
695  * @vbi: pointer to &struct v4l2_subdev_vbi_ops. Can be %NULL
696  * @ir: pointer to &struct v4l2_subdev_ir_ops. Can be %NULL
697  * @sensor: pointer to &struct v4l2_subdev_sensor_ops. Can be %NULL
698  * @pad: pointer to &struct v4l2_subdev_pad_ops. Can be %NULL
699  */
700 struct v4l2_subdev_ops {
701         const struct v4l2_subdev_core_ops       *core;
702         const struct v4l2_subdev_tuner_ops      *tuner;
703         const struct v4l2_subdev_audio_ops      *audio;
704         const struct v4l2_subdev_video_ops      *video;
705         const struct v4l2_subdev_vbi_ops        *vbi;
706         const struct v4l2_subdev_ir_ops         *ir;
707         const struct v4l2_subdev_sensor_ops     *sensor;
708         const struct v4l2_subdev_pad_ops        *pad;
709 };
710 
711 /**
712  * struct v4l2_subdev_internal_ops - V4L2 subdev internal ops
713  *
714  * @registered: called when this subdev is registered. When called the v4l2_dev
715  *      field is set to the correct v4l2_device.
716  *
717  * @unregistered: called when this subdev is unregistered. When called the
718  *      v4l2_dev field is still set to the correct v4l2_device.
719  *
720  * @open: called when the subdev device node is opened by an application.
721  *
722  * @close: called when the subdev device node is closed.
723  *
724  * .. note::
725  *      Never call this from drivers, only the v4l2 framework can call
726  *      these ops.
727  */
728 struct v4l2_subdev_internal_ops {
729         int (*registered)(struct v4l2_subdev *sd);
730         void (*unregistered)(struct v4l2_subdev *sd);
731         int (*open)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
732         int (*close)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
733 };
734 
735 #define V4L2_SUBDEV_NAME_SIZE 32
736 
737 /* Set this flag if this subdev is a i2c device. */
738 #define V4L2_SUBDEV_FL_IS_I2C                   (1U << 0)
739 /* Set this flag if this subdev is a spi device. */
740 #define V4L2_SUBDEV_FL_IS_SPI                   (1U << 1)
741 /* Set this flag if this subdev needs a device node. */
742 #define V4L2_SUBDEV_FL_HAS_DEVNODE              (1U << 2)
743 /* Set this flag if this subdev generates events. */
744 #define V4L2_SUBDEV_FL_HAS_EVENTS               (1U << 3)
745 
746 struct regulator_bulk_data;
747 
748 /**
749  * struct v4l2_subdev_platform_data - regulators config struct
750  *
751  * @regulators: Optional regulators used to power on/off the subdevice
752  * @num_regulators: Number of regululators
753  * @host_priv: Per-subdevice data, specific for a certain video host device
754  */
755 struct v4l2_subdev_platform_data {
756         struct regulator_bulk_data *regulators;
757         int num_regulators;
758 
759         void *host_priv;
760 };
761 
762 /**
763  * struct v4l2_subdev - describes a V4L2 sub-device
764  *
765  * @entity: pointer to &struct media_entity
766  * @list: List of sub-devices
767  * @owner: The owner is the same as the driver's &struct device owner.
768  * @owner_v4l2_dev: true if the &sd->owner matches the owner of @v4l2_dev->dev
769  *      ownner. Initialized by v4l2_device_register_subdev().
770  * @flags: subdev flags. Can be:
771  *   %V4L2_SUBDEV_FL_IS_I2C - Set this flag if this subdev is a i2c device;
772  *   %V4L2_SUBDEV_FL_IS_SPI - Set this flag if this subdev is a spi device;
773  *   %V4L2_SUBDEV_FL_HAS_DEVNODE - Set this flag if this subdev needs a
774  *   device node;
775  *   %V4L2_SUBDEV_FL_HAS_EVENTS -  Set this flag if this subdev generates
776  *   events.
777  *
778  * @v4l2_dev: pointer to struct &v4l2_device
779  * @ops: pointer to struct &v4l2_subdev_ops
780  * @internal_ops: pointer to struct &v4l2_subdev_internal_ops.
781  *      Never call these internal ops from within a driver!
782  * @ctrl_handler: The control handler of this subdev. May be NULL.
783  * @name: Name of the sub-device. Please notice that the name must be unique.
784  * @grp_id: can be used to group similar subdevs. Value is driver-specific
785  * @dev_priv: pointer to private data
786  * @host_priv: pointer to private data used by the device where the subdev
787  *      is attached.
788  * @devnode: subdev device node
789  * @dev: pointer to the physical device, if any
790  * @fwnode: The fwnode_handle of the subdev, usually the same as
791  *          either dev->of_node->fwnode or dev->fwnode (whichever is non-NULL).
792  * @async_list: Links this subdev to a global subdev_list or @notifier->done
793  *      list.
794  * @asd: Pointer to respective &struct v4l2_async_subdev.
795  * @notifier: Pointer to the managing notifier.
796  * @subdev_notifier: A sub-device notifier implicitly registered for the sub-
797  *                   device using v4l2_device_register_sensor_subdev().
798  * @pdata: common part of subdevice platform data
799  *
800  * Each instance of a subdev driver should create this struct, either
801  * stand-alone or embedded in a larger struct.
802  *
803  * This structure should be initialized by v4l2_subdev_init() or one of
804  * its variants: v4l2_spi_subdev_init(), v4l2_i2c_subdev_init().
805  */
806 struct v4l2_subdev {
807 #if defined(CONFIG_MEDIA_CONTROLLER)
808         struct media_entity entity;
809 #endif
810         struct list_head list;
811         struct module *owner;
812         bool owner_v4l2_dev;
813         u32 flags;
814         struct v4l2_device *v4l2_dev;
815         const struct v4l2_subdev_ops *ops;
816         const struct v4l2_subdev_internal_ops *internal_ops;
817         struct v4l2_ctrl_handler *ctrl_handler;
818         char name[V4L2_SUBDEV_NAME_SIZE];
819         u32 grp_id;
820         void *dev_priv;
821         void *host_priv;
822         struct video_device *devnode;
823         struct device *dev;
824         struct fwnode_handle *fwnode;
825         struct list_head async_list;
826         struct v4l2_async_subdev *asd;
827         struct v4l2_async_notifier *notifier;
828         struct v4l2_async_notifier *subdev_notifier;
829         struct v4l2_subdev_platform_data *pdata;
830 };
831 
832 #define media_entity_to_v4l2_subdev(ent)                                \
833 ({                                                                      \
834         typeof(ent) __me_sd_ent = (ent);                                \
835                                                                         \
836         __me_sd_ent ?                                                   \
837                 container_of(__me_sd_ent, struct v4l2_subdev, entity) : \
838                 NULL;                                                   \
839 })
840 
841 #define vdev_to_v4l2_subdev(vdev) \
842         ((struct v4l2_subdev *)video_get_drvdata(vdev))
843 
844 /**
845  * struct v4l2_subdev_fh - Used for storing subdev information per file handle
846  *
847  * @vfh: pointer to struct v4l2_fh
848  * @pad: pointer to v4l2_subdev_pad_config
849  */
850 struct v4l2_subdev_fh {
851         struct v4l2_fh vfh;
852 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
853         struct v4l2_subdev_pad_config *pad;
854 #endif
855 };
856 
857 #define to_v4l2_subdev_fh(fh)   \
858         container_of(fh, struct v4l2_subdev_fh, vfh)
859 
860 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
861 #define __V4L2_SUBDEV_MK_GET_TRY(rtype, fun_name, field_name)           \
862         static inline struct rtype *                                    \
863         fun_name(struct v4l2_subdev *sd,                                \
864                  struct v4l2_subdev_pad_config *cfg,                    \
865                  unsigned int pad)                                      \
866         {                                                               \
867                 BUG_ON(pad >= sd->entity.num_pads);                     \
868                 return &cfg[pad].field_name;                            \
869         }
870 
871 __V4L2_SUBDEV_MK_GET_TRY(v4l2_mbus_framefmt, v4l2_subdev_get_try_format, try_fmt)
872 __V4L2_SUBDEV_MK_GET_TRY(v4l2_rect, v4l2_subdev_get_try_crop, try_crop)
873 __V4L2_SUBDEV_MK_GET_TRY(v4l2_rect, v4l2_subdev_get_try_compose, try_compose)
874 #endif
875 
876 extern const struct v4l2_file_operations v4l2_subdev_fops;
877 
878 /**
879  * v4l2_set_subdevdata - Sets V4L2 dev private device data
880  *
881  * @sd: pointer to &struct v4l2_subdev
882  * @p: pointer to the private device data to be stored.
883  */
884 static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
885 {
886         sd->dev_priv = p;
887 }
888 
889 /**
890  * v4l2_get_subdevdata - Gets V4L2 dev private device data
891  *
892  * @sd: pointer to &struct v4l2_subdev
893  *
894  * Returns the pointer to the private device data to be stored.
895  */
896 static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
897 {
898         return sd->dev_priv;
899 }
900 
901 /**
902  * v4l2_set_subdev_hostdata - Sets V4L2 dev private host data
903  *
904  * @sd: pointer to &struct v4l2_subdev
905  * @p: pointer to the private data to be stored.
906  */
907 static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p)
908 {
909         sd->host_priv = p;
910 }
911 
912 /**
913  * v4l2_get_subdev_hostdata - Gets V4L2 dev private data
914  *
915  * @sd: pointer to &struct v4l2_subdev
916  *
917  * Returns the pointer to the private host data to be stored.
918  */
919 static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
920 {
921         return sd->host_priv;
922 }
923 
924 #ifdef CONFIG_MEDIA_CONTROLLER
925 
926 /**
927  * v4l2_subdev_link_validate_default - validates a media link
928  *
929  * @sd: pointer to &struct v4l2_subdev
930  * @link: pointer to &struct media_link
931  * @source_fmt: pointer to &struct v4l2_subdev_format
932  * @sink_fmt: pointer to &struct v4l2_subdev_format
933  *
934  * This function ensures that width, height and the media bus pixel
935  * code are equal on both source and sink of the link.
936  */
937 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
938                                       struct media_link *link,
939                                       struct v4l2_subdev_format *source_fmt,
940                                       struct v4l2_subdev_format *sink_fmt);
941 
942 /**
943  * v4l2_subdev_link_validate - validates a media link
944  *
945  * @link: pointer to &struct media_link
946  *
947  * This function calls the subdev's link_validate ops to validate
948  * if a media link is valid for streaming. It also internally
949  * calls v4l2_subdev_link_validate_default() to ensure that
950  * width, height and the media bus pixel code are equal on both
951  * source and sink of the link.
952  */
953 int v4l2_subdev_link_validate(struct media_link *link);
954 
955 /**
956  * v4l2_subdev_alloc_pad_config - Allocates memory for pad config
957  *
958  * @sd: pointer to struct v4l2_subdev
959  */
960 struct
961 v4l2_subdev_pad_config *v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd);
962 
963 /**
964  * v4l2_subdev_free_pad_config - Frees memory allocated by
965  *      v4l2_subdev_alloc_pad_config().
966  *
967  * @cfg: pointer to &struct v4l2_subdev_pad_config
968  */
969 void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg);
970 #endif /* CONFIG_MEDIA_CONTROLLER */
971 
972 /**
973  * v4l2_subdev_init - initializes the sub-device struct
974  *
975  * @sd: pointer to the &struct v4l2_subdev to be initialized
976  * @ops: pointer to &struct v4l2_subdev_ops.
977  */
978 void v4l2_subdev_init(struct v4l2_subdev *sd,
979                       const struct v4l2_subdev_ops *ops);
980 
981 /*
982  * Call an ops of a v4l2_subdev, doing the right checks against
983  * NULL pointers.
984  *
985  * Example: err = v4l2_subdev_call(sd, video, s_std, norm);
986  */
987 #define v4l2_subdev_call(sd, o, f, args...)                             \
988         ({                                                              \
989                 int __result;                                           \
990                 if (!(sd))                                              \
991                         __result = -ENODEV;                             \
992                 else if (!((sd)->ops->o && (sd)->ops->o->f))            \
993                         __result = -ENOIOCTLCMD;                        \
994                 else                                                    \
995                         __result = (sd)->ops->o->f((sd), ##args);       \
996                 __result;                                               \
997         })
998 
999 #define v4l2_subdev_has_op(sd, o, f) \
1000         ((sd)->ops->o && (sd)->ops->o->f)
1001 
1002 /**
1003  * v4l2_subdev_notify_event() - Delivers event notification for subdevice
1004  * @sd: The subdev for which to deliver the event
1005  * @ev: The event to deliver
1006  *
1007  * Will deliver the specified event to all userspace event listeners which are
1008  * subscribed to the v42l subdev event queue as well as to the bridge driver
1009  * using the notify callback. The notification type for the notify callback
1010  * will be %V4L2_DEVICE_NOTIFY_EVENT.
1011  */
1012 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
1013                               const struct v4l2_event *ev);
1014 
1015 #endif
1016 

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