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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#define V4L2_DEVICE_NOTIFY_EVENT _IOW('v', 2, struct v4l2_event)
44
45struct v4l2_device;
46struct v4l2_ctrl_handler;
47struct v4l2_event;
48struct v4l2_event_subscription;
49struct v4l2_fh;
50struct v4l2_subdev;
51struct v4l2_subdev_fh;
52struct tuner_setup;
53struct v4l2_mbus_frame_desc;
54
55/* decode_vbi_line */
56struct v4l2_decode_vbi_line {
57 u32 is_second_field; /* Set to 0 for the first (odd) field,
58 set to 1 for the second (even) field. */
59 u8 *p; /* Pointer to the sliced VBI data from the decoder.
60 On exit points to the start of the payload. */
61 u32 line; /* Line number of the sliced VBI data (1-23) */
62 u32 type; /* VBI service type (V4L2_SLICED_*). 0 if no service found */
63};
64
65/* Sub-devices are devices that are connected somehow to the main bridge
66 device. These devices are usually audio/video muxers/encoders/decoders or
67 sensors and webcam controllers.
68
69 Usually these devices are controlled through an i2c bus, but other busses
70 may also be used.
71
72 The v4l2_subdev struct provides a way of accessing these devices in a
73 generic manner. Most operations that these sub-devices support fall in
74 a few categories: core ops, audio ops, video ops and tuner ops.
75
76 More categories can be added if needed, although this should remain a
77 limited set (no more than approx. 8 categories).
78
79 Each category has its own set of ops that subdev drivers can implement.
80
81 A subdev driver can leave the pointer to the category ops NULL if
82 it does not implement them (e.g. an audio subdev will generally not
83 implement the video category ops). The exception is the core category:
84 this must always be present.
85
86 These ops are all used internally so it is no problem to change, remove
87 or add ops or move ops from one to another category. Currently these
88 ops are based on the original ioctls, but since ops are not limited to
89 one argument there is room for improvement here once all i2c subdev
90 drivers are converted to use these ops.
91 */
92
93/* Core ops: it is highly recommended to implement at least these ops:
94
95 log_status
96 g_register
97 s_register
98
99 This provides basic debugging support.
100
101 The ioctl ops is meant for generic ioctl-like commands. Depending on
102 the use-case it might be better to use subdev-specific ops (currently
103 not yet implemented) since ops provide proper type-checking.
104 */
105
106/* Subdevice external IO pin configuration */
107#define V4L2_SUBDEV_IO_PIN_DISABLE (1 << 0) /* ENABLE assumed */
108#define V4L2_SUBDEV_IO_PIN_OUTPUT (1 << 1)
109#define V4L2_SUBDEV_IO_PIN_INPUT (1 << 2)
110#define V4L2_SUBDEV_IO_PIN_SET_VALUE (1 << 3) /* Set output value */
111#define V4L2_SUBDEV_IO_PIN_ACTIVE_LOW (1 << 4) /* ACTIVE HIGH assumed */
112
113struct v4l2_subdev_io_pin_config {
114 u32 flags; /* V4L2_SUBDEV_IO_PIN_* flags for this pin's config */
115 u8 pin; /* Chip external IO pin to configure */
116 u8 function; /* Internal signal pad/function to route to IO pin */
117 u8 value; /* Initial value for pin - e.g. GPIO output value */
118 u8 strength; /* Pin drive strength */
119};
120
121/**
122 * struct v4l2_subdev_core_ops - Define core ops callbacks for subdevs
123 *
124 * @log_status: callback for VIDIOC_LOG_STATUS ioctl handler code.
125 *
126 * @s_io_pin_config: configure one or more chip I/O pins for chips that
127 * multiplex different internal signal pads out to IO pins. This function
128 * takes a pointer to an array of 'n' pin configuration entries, one for
129 * each pin being configured. This function could be called at times
130 * other than just subdevice initialization.
131 *
132 * @init: initialize the sensor registers to some sort of reasonable default
133 * values. Do not use for new drivers and should be removed in existing
134 * drivers.
135 *
136 * @load_fw: load firmware.
137 *
138 * @reset: generic reset command. The argument selects which subsystems to
139 * reset. Passing 0 will always reset the whole chip. Do not use for new
140 * drivers without discussing this first on the linux-media mailinglist.
141 * There should be no reason normally to reset a device.
142 *
143 * @s_gpio: set GPIO pins. Very simple right now, might need to be extended with
144 * a direction argument if needed.
145 *
146 * @queryctrl: callback for VIDIOC_QUERYCTL ioctl handler code.
147 *
148 * @g_ctrl: callback for VIDIOC_G_CTRL ioctl handler code.
149 *
150 * @s_ctrl: callback for VIDIOC_S_CTRL ioctl handler code.
151 *
152 * @g_ext_ctrls: callback for VIDIOC_G_EXT_CTRLS ioctl handler code.
153 *
154 * @s_ext_ctrls: callback for VIDIOC_S_EXT_CTRLS ioctl handler code.
155 *
156 * @try_ext_ctrls: callback for VIDIOC_TRY_EXT_CTRLS ioctl handler code.
157 *
158 * @querymenu: callback for VIDIOC_QUERYMENU ioctl handler code.
159 *
160 * @ioctl: called at the end of ioctl() syscall handler at the V4L2 core.
161 * used to provide support for private ioctls used on the driver.
162 *
163 * @compat_ioctl32: called when a 32 bits application uses a 64 bits Kernel,
164 * in order to fix data passed from/to userspace.
165 *
166 * @g_register: callback for VIDIOC_G_REGISTER ioctl handler code.
167 *
168 * @s_register: callback for VIDIOC_G_REGISTER ioctl handler code.
169 *
170 * @s_power: puts subdevice in power saving mode (on == 0) or normal operation
171 * mode (on == 1).
172 *
173 * @interrupt_service_routine: Called by the bridge chip's interrupt service
174 * handler, when an interrupt status has be raised due to this subdev,
175 * so that this subdev can handle the details. It may schedule work to be
176 * performed later. It must not sleep. *Called from an IRQ context*.
177 *
178 * @subscribe_event: used by the drivers to request the control framework that
179 * for it to be warned when the value of a control changes.
180 *
181 * @unsubscribe_event: remove event subscription from the control framework.
182 *
183 * @registered_async: the subdevice has been registered async.
184 */
185struct v4l2_subdev_core_ops {
186 int (*log_status)(struct v4l2_subdev *sd);
187 int (*s_io_pin_config)(struct v4l2_subdev *sd, size_t n,
188 struct v4l2_subdev_io_pin_config *pincfg);
189 int (*init)(struct v4l2_subdev *sd, u32 val);
190 int (*load_fw)(struct v4l2_subdev *sd);
191 int (*reset)(struct v4l2_subdev *sd, u32 val);
192 int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
193 int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
194 int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
195 int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
196 int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
197 int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
198 int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
199 int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
200 long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
201#ifdef CONFIG_COMPAT
202 long (*compat_ioctl32)(struct v4l2_subdev *sd, unsigned int cmd,
203 unsigned long arg);
204#endif
205#ifdef CONFIG_VIDEO_ADV_DEBUG
206 int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
207 int (*s_register)(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg);
208#endif
209 int (*s_power)(struct v4l2_subdev *sd, int on);
210 int (*interrupt_service_routine)(struct v4l2_subdev *sd,
211 u32 status, bool *handled);
212 int (*subscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
213 struct v4l2_event_subscription *sub);
214 int (*unsubscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
215 struct v4l2_event_subscription *sub);
216 int (*registered_async)(struct v4l2_subdev *sd);
217};
218
219/**
220 * struct s_radio - Callbacks used when v4l device was opened in radio mode.
221 *
222 * @s_radio: callback for VIDIOC_S_RADIO ioctl handler code.
223 *
224 * @s_frequency: callback for VIDIOC_S_FREQUENCY ioctl handler code.
225 *
226 * @g_frequency: callback for VIDIOC_G_FREQUENCY ioctl handler code.
227 * freq->type must be filled in. Normally done by video_ioctl2
228 * or the bridge driver.
229 *
230 * @enum_freq_bands: callback for VIDIOC_ENUM_FREQ_BANDS ioctl handler code.
231 *
232 * @g_tuner: callback for VIDIOC_G_TUNER ioctl handler code.
233 *
234 * @s_tuner: callback for VIDIOC_S_TUNER ioctl handler code. vt->type must be
235 * filled in. Normally done by video_ioctl2 or the
236 * bridge driver.
237 *
238 * @g_modulator: callback for VIDIOC_G_MODULATOR ioctl handler code.
239 *
240 * @s_modulator: callback for VIDIOC_S_MODULATOR ioctl handler code.
241 *
242 * @s_type_addr: sets tuner type and its I2C addr.
243 *
244 * @s_config: sets tda9887 specific stuff, like port1, port2 and qss
245 */
246struct v4l2_subdev_tuner_ops {
247 int (*s_radio)(struct v4l2_subdev *sd);
248 int (*s_frequency)(struct v4l2_subdev *sd, const struct v4l2_frequency *freq);
249 int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
250 int (*enum_freq_bands)(struct v4l2_subdev *sd, struct v4l2_frequency_band *band);
251 int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
252 int (*s_tuner)(struct v4l2_subdev *sd, const struct v4l2_tuner *vt);
253 int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
254 int (*s_modulator)(struct v4l2_subdev *sd, const struct v4l2_modulator *vm);
255 int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
256 int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
257};
258
259/**
260 * struct v4l2_subdev_audio_ops - Callbacks used for audio-related settings
261 *
262 * @s_clock_freq: set the frequency (in Hz) of the audio clock output.
263 * Used to slave an audio processor to the video decoder, ensuring that
264 * audio and video remain synchronized. Usual values for the frequency
265 * are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
266 * -EINVAL is returned.
267 *
268 * @s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
269 * way to select I2S clock used by driving digital audio streams at some
270 * board designs. Usual values for the frequency are 1024000 and 2048000.
271 * If the frequency is not supported, then -EINVAL is returned.
272 *
273 * @s_routing: used to define the input and/or output pins of an audio chip,
274 * and any additional configuration data.
275 * Never attempt to use user-level input IDs (e.g. Composite, S-Video,
276 * Tuner) at this level. An i2c device shouldn't know about whether an
277 * input pin is connected to a Composite connector, become on another
278 * board or platform it might be connected to something else entirely.
279 * The calling driver is responsible for mapping a user-level input to
280 * the right pins on the i2c device.
281 *
282 * @s_stream: used to notify the audio code that stream will start or has
283 * stopped.
284 */
285struct v4l2_subdev_audio_ops {
286 int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
287 int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
288 int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
289 int (*s_stream)(struct v4l2_subdev *sd, int enable);
290};
291
292/* Indicates the @length field specifies maximum data length. */
293#define V4L2_MBUS_FRAME_DESC_FL_LEN_MAX (1U << 0)
294/*
295 * Indicates that the format does not have line offsets, i.e. the
296 * receiver should use 1D DMA.
297 */
298#define V4L2_MBUS_FRAME_DESC_FL_BLOB (1U << 1)
299
300/**
301 * struct v4l2_mbus_frame_desc_entry - media bus frame description structure
302 *
303 * @flags: V4L2_MBUS_FRAME_DESC_FL_* flags
304 * @pixelcode: media bus pixel code, valid if FRAME_DESC_FL_BLOB is not set
305 * @length: number of octets per frame, valid if V4L2_MBUS_FRAME_DESC_FL_BLOB
306 * is set
307 */
308struct v4l2_mbus_frame_desc_entry {
309 u16 flags;
310 u32 pixelcode;
311 u32 length;
312};
313
314#define V4L2_FRAME_DESC_ENTRY_MAX 4
315
316/**
317 * struct v4l2_mbus_frame_desc - media bus data frame description
318 * @entry: frame descriptors array
319 * @num_entries: number of entries in @entry array
320 */
321struct v4l2_mbus_frame_desc {
322 struct v4l2_mbus_frame_desc_entry entry[V4L2_FRAME_DESC_ENTRY_MAX];
323 unsigned short num_entries;
324};
325
326/**
327 * struct v4l2_subdev_video_ops - Callbacks used when v4l device was opened
328 * in video mode.
329 *
330 * @s_routing: see s_routing in audio_ops, except this version is for video
331 * devices.
332 *
333 * @s_crystal_freq: sets the frequency of the crystal used to generate the
334 * clocks in Hz. An extra flags field allows device specific configuration
335 * regarding clock frequency dividers, etc. If not used, then set flags
336 * to 0. If the frequency is not supported, then -EINVAL is returned.
337 *
338 * @g_std: callback for VIDIOC_G_STD ioctl handler code.
339 *
340 * @s_std: callback for VIDIOC_S_STD ioctl handler code.
341 *
342 * @s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
343 * video input devices.
344 *
345 * @g_std_output: get current standard for video OUTPUT devices. This is ignored
346 * by video input devices.
347 *
348 * @querystd: callback for VIDIOC_QUERYSTD ioctl handler code.
349 *
350 * @g_tvnorms: get v4l2_std_id with all standards supported by the video
351 * CAPTURE device. This is ignored by video output devices.
352 *
353 * @g_tvnorms_output: get v4l2_std_id with all standards supported by the video
354 * OUTPUT device. This is ignored by video capture devices.
355 *
356 * @g_input_status: get input status. Same as the status field in the v4l2_input
357 * struct.
358 *
359 * @s_stream: used to notify the driver that a video stream will start or has
360 * stopped.
361 *
362 * @cropcap: callback for VIDIOC_CROPCAP ioctl handler code.
363 *
364 * @g_crop: callback for VIDIOC_G_CROP ioctl handler code.
365 *
366 * @s_crop: callback for VIDIOC_S_CROP ioctl handler code.
367 *
368 * @g_parm: callback for VIDIOC_G_PARM ioctl handler code.
369 *
370 * @s_parm: callback for VIDIOC_S_PARM ioctl handler code.
371 *
372 * @g_frame_interval: callback for VIDIOC_G_FRAMEINTERVAL ioctl handler code.
373 *
374 * @s_frame_interval: callback for VIDIOC_S_FRAMEINTERVAL ioctl handler code.
375 *
376 * @s_dv_timings: Set custom dv timings in the sub device. This is used
377 * when sub device is capable of setting detailed timing information
378 * in the hardware to generate/detect the video signal.
379 *
380 * @g_dv_timings: Get custom dv timings in the sub device.
381 *
382 * @query_dv_timings: callback for VIDIOC_QUERY_DV_TIMINGS ioctl handler code.
383 *
384 * @g_mbus_config: get supported mediabus configurations
385 *
386 * @s_mbus_config: set a certain mediabus configuration. This operation is added
387 * for compatibility with soc-camera drivers and should not be used by new
388 * software.
389 *
390 * @s_rx_buffer: set a host allocated memory buffer for the subdev. The subdev
391 * can adjust @size to a lower value and must not write more data to the
392 * buffer starting at @data than the original value of @size.
393 */
394struct v4l2_subdev_video_ops {
395 int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
396 int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
397 int (*g_std)(struct v4l2_subdev *sd, v4l2_std_id *norm);
398 int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
399 int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
400 int (*g_std_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
401 int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
402 int (*g_tvnorms)(struct v4l2_subdev *sd, v4l2_std_id *std);
403 int (*g_tvnorms_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
404 int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
405 int (*s_stream)(struct v4l2_subdev *sd, int enable);
406 int (*cropcap)(struct v4l2_subdev *sd, struct v4l2_cropcap *cc);
407 int (*g_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
408 int (*s_crop)(struct v4l2_subdev *sd, const struct v4l2_crop *crop);
409 int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
410 int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
411 int (*g_frame_interval)(struct v4l2_subdev *sd,
412 struct v4l2_subdev_frame_interval *interval);
413 int (*s_frame_interval)(struct v4l2_subdev *sd,
414 struct v4l2_subdev_frame_interval *interval);
415 int (*s_dv_timings)(struct v4l2_subdev *sd,
416 struct v4l2_dv_timings *timings);
417 int (*g_dv_timings)(struct v4l2_subdev *sd,
418 struct v4l2_dv_timings *timings);
419 int (*query_dv_timings)(struct v4l2_subdev *sd,
420 struct v4l2_dv_timings *timings);
421 int (*g_mbus_config)(struct v4l2_subdev *sd,
422 struct v4l2_mbus_config *cfg);
423 int (*s_mbus_config)(struct v4l2_subdev *sd,
424 const struct v4l2_mbus_config *cfg);
425 int (*s_rx_buffer)(struct v4l2_subdev *sd, void *buf,
426 unsigned int *size);
427};
428
429/**
430 * struct v4l2_subdev_vbi_ops - Callbacks used when v4l device was opened
431 * in video mode via the vbi device node.
432 *
433 * @decode_vbi_line: video decoders that support sliced VBI need to implement
434 * this ioctl. Field p of the v4l2_sliced_vbi_line struct is set to the
435 * start of the VBI data that was generated by the decoder. The driver
436 * then parses the sliced VBI data and sets the other fields in the
437 * struct accordingly. The pointer p is updated to point to the start of
438 * the payload which can be copied verbatim into the data field of the
439 * v4l2_sliced_vbi_data struct. If no valid VBI data was found, then the
440 * type field is set to 0 on return.
441 *
442 * @s_vbi_data: used to generate VBI signals on a video signal.
443 * v4l2_sliced_vbi_data is filled with the data packets that should be
444 * output. Note that if you set the line field to 0, then that VBI signal
445 * is disabled. If no valid VBI data was found, then the type field is
446 * set to 0 on return.
447 *
448 * @g_vbi_data: used to obtain the sliced VBI packet from a readback register.
449 * Not all video decoders support this. If no data is available because
450 * the readback register contains invalid or erroneous data -EIO is
451 * returned. Note that you must fill in the 'id' member and the 'field'
452 * member (to determine whether CC data from the first or second field
453 * should be obtained).
454 *
455 * @g_sliced_vbi_cap: callback for VIDIOC_SLICED_VBI_CAP ioctl handler code.
456 *
457 * @s_raw_fmt: setup the video encoder/decoder for raw VBI.
458 *
459 * @g_sliced_fmt: retrieve the current sliced VBI settings.
460 *
461 * @s_sliced_fmt: setup the sliced VBI settings.
462 */
463struct v4l2_subdev_vbi_ops {
464 int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
465 int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
466 int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
467 int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
468 int (*s_raw_fmt)(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt);
469 int (*g_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
470 int (*s_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
471};
472
473/**
474 * struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
475 * @g_skip_top_lines: number of lines at the top of the image to be skipped.
476 * This is needed for some sensors, which always corrupt
477 * several top lines of the output image, or which send their
478 * metadata in them.
479 * @g_skip_frames: number of frames to skip at stream start. This is needed for
480 * buggy sensors that generate faulty frames when they are
481 * turned on.
482 */
483struct v4l2_subdev_sensor_ops {
484 int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
485 int (*g_skip_frames)(struct v4l2_subdev *sd, u32 *frames);
486};
487
488/*
489 [rt]x_g_parameters: Get the current operating parameters and state of the
490 the IR receiver or transmitter.
491
492 [rt]x_s_parameters: Set the current operating parameters and state of the
493 the IR receiver or transmitter. It is recommended to call
494 [rt]x_g_parameters first to fill out the current state, and only change
495 the fields that need to be changed. Upon return, the actual device
496 operating parameters and state will be returned. Note that hardware
497 limitations may prevent the actual settings from matching the requested
498 settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
499 was requested. An exception is when the shutdown parameter is true.
500 The last used operational parameters will be returned, but the actual
501 state of the hardware be different to minimize power consumption and
502 processing when shutdown is true.
503
504 rx_read: Reads received codes or pulse width data.
505 The semantics are similar to a non-blocking read() call.
506
507 tx_write: Writes codes or pulse width data for transmission.
508 The semantics are similar to a non-blocking write() call.
509 */
510
511enum v4l2_subdev_ir_mode {
512 V4L2_SUBDEV_IR_MODE_PULSE_WIDTH, /* uses struct ir_raw_event records */
513};
514
515struct v4l2_subdev_ir_parameters {
516 /* Either Rx or Tx */
517 unsigned int bytes_per_data_element; /* of data in read or write call */
518 enum v4l2_subdev_ir_mode mode;
519
520 bool enable;
521 bool interrupt_enable;
522 bool shutdown; /* true: set hardware to low/no power, false: normal */
523
524 bool modulation; /* true: uses carrier, false: baseband */
525 u32 max_pulse_width; /* ns, valid only for baseband signal */
526 unsigned int carrier_freq; /* Hz, valid only for modulated signal*/
527 unsigned int duty_cycle; /* percent, valid only for modulated signal*/
528 bool invert_level; /* invert signal level */
529
530 /* Tx only */
531 bool invert_carrier_sense; /* Send 0/space as a carrier burst */
532
533 /* Rx only */
534 u32 noise_filter_min_width; /* ns, min time of a valid pulse */
535 unsigned int carrier_range_lower; /* Hz, valid only for modulated sig */
536 unsigned int carrier_range_upper; /* Hz, valid only for modulated sig */
537 u32 resolution; /* ns */
538};
539
540struct v4l2_subdev_ir_ops {
541 /* Receiver */
542 int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
543 ssize_t *num);
544
545 int (*rx_g_parameters)(struct v4l2_subdev *sd,
546 struct v4l2_subdev_ir_parameters *params);
547 int (*rx_s_parameters)(struct v4l2_subdev *sd,
548 struct v4l2_subdev_ir_parameters *params);
549
550 /* Transmitter */
551 int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
552 ssize_t *num);
553
554 int (*tx_g_parameters)(struct v4l2_subdev *sd,
555 struct v4l2_subdev_ir_parameters *params);
556 int (*tx_s_parameters)(struct v4l2_subdev *sd,
557 struct v4l2_subdev_ir_parameters *params);
558};
559
560/*
561 * Used for storing subdev pad information. This structure only needs
562 * to be passed to the pad op if the 'which' field of the main argument
563 * is set to V4L2_SUBDEV_FORMAT_TRY. For V4L2_SUBDEV_FORMAT_ACTIVE it is
564 * safe to pass NULL.
565 */
566struct v4l2_subdev_pad_config {
567 struct v4l2_mbus_framefmt try_fmt;
568 struct v4l2_rect try_crop;
569 struct v4l2_rect try_compose;
570};
571
572/**
573 * struct v4l2_subdev_pad_ops - v4l2-subdev pad level operations
574 *
575 * @enum_mbus_code: callback for VIDIOC_SUBDEV_ENUM_MBUS_CODE ioctl handler
576 * code.
577 * @enum_frame_size: callback for VIDIOC_SUBDEV_ENUM_FRAME_SIZE ioctl handler
578 * code.
579 *
580 * @enum_frame_interval: callback for VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL ioctl
581 * handler code.
582 *
583 * @get_fmt: callback for VIDIOC_SUBDEV_G_FMT ioctl handler code.
584 *
585 * @set_fmt: callback for VIDIOC_SUBDEV_S_FMT ioctl handler code.
586 *
587 * @get_selection: callback for VIDIOC_SUBDEV_G_SELECTION ioctl handler code.
588 *
589 * @set_selection: callback for VIDIOC_SUBDEV_S_SELECTION ioctl handler code.
590 *
591 * @get_edid: callback for VIDIOC_SUBDEV_G_EDID ioctl handler code.
592 *
593 * @set_edid: callback for VIDIOC_SUBDEV_S_EDID ioctl handler code.
594 *
595 * @dv_timings_cap: callback for VIDIOC_SUBDEV_DV_TIMINGS_CAP ioctl handler
596 * code.
597 *
598 * @enum_dv_timings: callback for VIDIOC_SUBDEV_ENUM_DV_TIMINGS ioctl handler
599 * code.
600 *
601 * @link_validate: used by the media controller code to check if the links
602 * that belongs to a pipeline can be used for stream.
603 *
604 * @get_frame_desc: get the current low level media bus frame parameters.
605 *
606 * @set_frame_desc: set the low level media bus frame parameters, @fd array
607 * may be adjusted by the subdev driver to device capabilities.
608 */
609struct v4l2_subdev_pad_ops {
610 int (*enum_mbus_code)(struct v4l2_subdev *sd,
611 struct v4l2_subdev_pad_config *cfg,
612 struct v4l2_subdev_mbus_code_enum *code);
613 int (*enum_frame_size)(struct v4l2_subdev *sd,
614 struct v4l2_subdev_pad_config *cfg,
615 struct v4l2_subdev_frame_size_enum *fse);
616 int (*enum_frame_interval)(struct v4l2_subdev *sd,
617 struct v4l2_subdev_pad_config *cfg,
618 struct v4l2_subdev_frame_interval_enum *fie);
619 int (*get_fmt)(struct v4l2_subdev *sd,
620 struct v4l2_subdev_pad_config *cfg,
621 struct v4l2_subdev_format *format);
622 int (*set_fmt)(struct v4l2_subdev *sd,
623 struct v4l2_subdev_pad_config *cfg,
624 struct v4l2_subdev_format *format);
625 int (*get_selection)(struct v4l2_subdev *sd,
626 struct v4l2_subdev_pad_config *cfg,
627 struct v4l2_subdev_selection *sel);
628 int (*set_selection)(struct v4l2_subdev *sd,
629 struct v4l2_subdev_pad_config *cfg,
630 struct v4l2_subdev_selection *sel);
631 int (*get_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
632 int (*set_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
633 int (*dv_timings_cap)(struct v4l2_subdev *sd,
634 struct v4l2_dv_timings_cap *cap);
635 int (*enum_dv_timings)(struct v4l2_subdev *sd,
636 struct v4l2_enum_dv_timings *timings);
637#ifdef CONFIG_MEDIA_CONTROLLER
638 int (*link_validate)(struct v4l2_subdev *sd, struct media_link *link,
639 struct v4l2_subdev_format *source_fmt,
640 struct v4l2_subdev_format *sink_fmt);
641#endif /* CONFIG_MEDIA_CONTROLLER */
642 int (*get_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
643 struct v4l2_mbus_frame_desc *fd);
644 int (*set_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
645 struct v4l2_mbus_frame_desc *fd);
646};
647
648struct v4l2_subdev_ops {
649 const struct v4l2_subdev_core_ops *core;
650 const struct v4l2_subdev_tuner_ops *tuner;
651 const struct v4l2_subdev_audio_ops *audio;
652 const struct v4l2_subdev_video_ops *video;
653 const struct v4l2_subdev_vbi_ops *vbi;
654 const struct v4l2_subdev_ir_ops *ir;
655 const struct v4l2_subdev_sensor_ops *sensor;
656 const struct v4l2_subdev_pad_ops *pad;
657};
658
659/*
660 * Internal ops. Never call this from drivers, only the v4l2 framework can call
661 * these ops.
662 *
663 * registered: called when this subdev is registered. When called the v4l2_dev
664 * field is set to the correct v4l2_device.
665 *
666 * unregistered: called when this subdev is unregistered. When called the
667 * v4l2_dev field is still set to the correct v4l2_device.
668 *
669 * open: called when the subdev device node is opened by an application.
670 *
671 * close: called when the subdev device node is closed.
672 */
673struct v4l2_subdev_internal_ops {
674 int (*registered)(struct v4l2_subdev *sd);
675 void (*unregistered)(struct v4l2_subdev *sd);
676 int (*open)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
677 int (*close)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
678};
679
680#define V4L2_SUBDEV_NAME_SIZE 32
681
682/* Set this flag if this subdev is a i2c device. */
683#define V4L2_SUBDEV_FL_IS_I2C (1U << 0)
684/* Set this flag if this subdev is a spi device. */
685#define V4L2_SUBDEV_FL_IS_SPI (1U << 1)
686/* Set this flag if this subdev needs a device node. */
687#define V4L2_SUBDEV_FL_HAS_DEVNODE (1U << 2)
688/* Set this flag if this subdev generates events. */
689#define V4L2_SUBDEV_FL_HAS_EVENTS (1U << 3)
690
691struct regulator_bulk_data;
692
693struct v4l2_subdev_platform_data {
694 /* Optional regulators uset to power on/off the subdevice */
695 struct regulator_bulk_data *regulators;
696 int num_regulators;
697
698 /* Per-subdevice data, specific for a certain video host device */
699 void *host_priv;
700};
701
702/* Each instance of a subdev driver should create this struct, either
703 stand-alone or embedded in a larger struct.
704 */
705struct v4l2_subdev {
706#if defined(CONFIG_MEDIA_CONTROLLER)
707 struct media_entity entity;
708#endif
709 struct list_head list;
710 struct module *owner;
711 bool owner_v4l2_dev;
712 u32 flags;
713 struct v4l2_device *v4l2_dev;
714 const struct v4l2_subdev_ops *ops;
715 /* Never call these internal ops from within a driver! */
716 const struct v4l2_subdev_internal_ops *internal_ops;
717 /* The control handler of this subdev. May be NULL. */
718 struct v4l2_ctrl_handler *ctrl_handler;
719 /* name must be unique */
720 char name[V4L2_SUBDEV_NAME_SIZE];
721 /* can be used to group similar subdevs, value is driver-specific */
722 u32 grp_id;
723 /* pointer to private data */
724 void *dev_priv;
725 void *host_priv;
726 /* subdev device node */
727 struct video_device *devnode;
728 /* pointer to the physical device, if any */
729 struct device *dev;
730 /* The device_node of the subdev, usually the same as dev->of_node. */
731 struct device_node *of_node;
732 /* Links this subdev to a global subdev_list or @notifier->done list. */
733 struct list_head async_list;
734 /* Pointer to respective struct v4l2_async_subdev. */
735 struct v4l2_async_subdev *asd;
736 /* Pointer to the managing notifier. */
737 struct v4l2_async_notifier *notifier;
738 /* common part of subdevice platform data */
739 struct v4l2_subdev_platform_data *pdata;
740};
741
742#define media_entity_to_v4l2_subdev(ent) \
743 container_of(ent, struct v4l2_subdev, entity)
744#define vdev_to_v4l2_subdev(vdev) \
745 ((struct v4l2_subdev *)video_get_drvdata(vdev))
746
747/*
748 * Used for storing subdev information per file handle
749 */
750struct v4l2_subdev_fh {
751 struct v4l2_fh vfh;
752#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
753 struct v4l2_subdev_pad_config *pad;
754#endif
755};
756
757#define to_v4l2_subdev_fh(fh) \
758 container_of(fh, struct v4l2_subdev_fh, vfh)
759
760#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
761#define __V4L2_SUBDEV_MK_GET_TRY(rtype, fun_name, field_name) \
762 static inline struct rtype * \
763 fun_name(struct v4l2_subdev *sd, \
764 struct v4l2_subdev_pad_config *cfg, \
765 unsigned int pad) \
766 { \
767 BUG_ON(pad >= sd->entity.num_pads); \
768 return &cfg[pad].field_name; \
769 }
770
771__V4L2_SUBDEV_MK_GET_TRY(v4l2_mbus_framefmt, v4l2_subdev_get_try_format, try_fmt)
772__V4L2_SUBDEV_MK_GET_TRY(v4l2_rect, v4l2_subdev_get_try_crop, try_crop)
773__V4L2_SUBDEV_MK_GET_TRY(v4l2_rect, v4l2_subdev_get_try_compose, try_compose)
774#endif
775
776extern const struct v4l2_file_operations v4l2_subdev_fops;
777
778static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
779{
780 sd->dev_priv = p;
781}
782
783static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
784{
785 return sd->dev_priv;
786}
787
788static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p)
789{
790 sd->host_priv = p;
791}
792
793static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
794{
795 return sd->host_priv;
796}
797
798#ifdef CONFIG_MEDIA_CONTROLLER
799int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
800 struct media_link *link,
801 struct v4l2_subdev_format *source_fmt,
802 struct v4l2_subdev_format *sink_fmt);
803int v4l2_subdev_link_validate(struct media_link *link);
804#endif /* CONFIG_MEDIA_CONTROLLER */
805void v4l2_subdev_init(struct v4l2_subdev *sd,
806 const struct v4l2_subdev_ops *ops);
807
808/* Call an ops of a v4l2_subdev, doing the right checks against
809 NULL pointers.
810
811 Example: err = v4l2_subdev_call(sd, video, s_std, norm);
812 */
813#define v4l2_subdev_call(sd, o, f, args...) \
814 (!(sd) ? -ENODEV : (((sd)->ops->o && (sd)->ops->o->f) ? \
815 (sd)->ops->o->f((sd) , ##args) : -ENOIOCTLCMD))
816
817#define v4l2_subdev_has_op(sd, o, f) \
818 ((sd)->ops->o && (sd)->ops->o->f)
819
820void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
821 const struct v4l2_event *ev);
822
823#endif
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * V4L2 sub-device support header.
4 *
5 * Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
6 */
7
8#ifndef _V4L2_SUBDEV_H
9#define _V4L2_SUBDEV_H
10
11#include <linux/types.h>
12#include <linux/v4l2-subdev.h>
13#include <media/media-entity.h>
14#include <media/v4l2-async.h>
15#include <media/v4l2-common.h>
16#include <media/v4l2-dev.h>
17#include <media/v4l2-fh.h>
18#include <media/v4l2-mediabus.h>
19
20/* generic v4l2_device notify callback notification values */
21#define V4L2_SUBDEV_IR_RX_NOTIFY _IOW('v', 0, u32)
22#define V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ 0x00000001
23#define V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED 0x00000002
24#define V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN 0x00000004
25#define V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN 0x00000008
26
27#define V4L2_SUBDEV_IR_TX_NOTIFY _IOW('v', 1, u32)
28#define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ 0x00000001
29
30#define V4L2_DEVICE_NOTIFY_EVENT _IOW('v', 2, struct v4l2_event)
31
32struct v4l2_device;
33struct v4l2_ctrl_handler;
34struct v4l2_event;
35struct v4l2_event_subscription;
36struct v4l2_fh;
37struct v4l2_subdev;
38struct v4l2_subdev_fh;
39struct tuner_setup;
40struct v4l2_mbus_frame_desc;
41struct led_classdev;
42
43/**
44 * struct v4l2_decode_vbi_line - used to decode_vbi_line
45 *
46 * @is_second_field: Set to 0 for the first (odd) field;
47 * set to 1 for the second (even) field.
48 * @p: Pointer to the sliced VBI data from the decoder. On exit, points to
49 * the start of the payload.
50 * @line: Line number of the sliced VBI data (1-23)
51 * @type: VBI service type (V4L2_SLICED_*). 0 if no service found
52 */
53struct v4l2_decode_vbi_line {
54 u32 is_second_field;
55 u8 *p;
56 u32 line;
57 u32 type;
58};
59
60/*
61 * Sub-devices are devices that are connected somehow to the main bridge
62 * device. These devices are usually audio/video muxers/encoders/decoders or
63 * sensors and webcam controllers.
64 *
65 * Usually these devices are controlled through an i2c bus, but other buses
66 * may also be used.
67 *
68 * The v4l2_subdev struct provides a way of accessing these devices in a
69 * generic manner. Most operations that these sub-devices support fall in
70 * a few categories: core ops, audio ops, video ops and tuner ops.
71 *
72 * More categories can be added if needed, although this should remain a
73 * limited set (no more than approx. 8 categories).
74 *
75 * Each category has its own set of ops that subdev drivers can implement.
76 *
77 * A subdev driver can leave the pointer to the category ops NULL if
78 * it does not implement them (e.g. an audio subdev will generally not
79 * implement the video category ops). The exception is the core category:
80 * this must always be present.
81 *
82 * These ops are all used internally so it is no problem to change, remove
83 * or add ops or move ops from one to another category. Currently these
84 * ops are based on the original ioctls, but since ops are not limited to
85 * one argument there is room for improvement here once all i2c subdev
86 * drivers are converted to use these ops.
87 */
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/**
104 * enum v4l2_subdev_io_pin_bits - Subdevice external IO pin configuration
105 * bits
106 *
107 * @V4L2_SUBDEV_IO_PIN_DISABLE: disables a pin config. ENABLE assumed.
108 * @V4L2_SUBDEV_IO_PIN_OUTPUT: set it if pin is an output.
109 * @V4L2_SUBDEV_IO_PIN_INPUT: set it if pin is an input.
110 * @V4L2_SUBDEV_IO_PIN_SET_VALUE: to set the output value via
111 * &struct v4l2_subdev_io_pin_config->value.
112 * @V4L2_SUBDEV_IO_PIN_ACTIVE_LOW: pin active is bit 0.
113 * Otherwise, ACTIVE HIGH is assumed.
114 */
115enum v4l2_subdev_io_pin_bits {
116 V4L2_SUBDEV_IO_PIN_DISABLE = 0,
117 V4L2_SUBDEV_IO_PIN_OUTPUT = 1,
118 V4L2_SUBDEV_IO_PIN_INPUT = 2,
119 V4L2_SUBDEV_IO_PIN_SET_VALUE = 3,
120 V4L2_SUBDEV_IO_PIN_ACTIVE_LOW = 4,
121};
122
123/**
124 * struct v4l2_subdev_io_pin_config - Subdevice external IO pin configuration
125 *
126 * @flags: bitmask with flags for this pin's config, whose bits are defined by
127 * &enum v4l2_subdev_io_pin_bits.
128 * @pin: Chip external IO pin to configure
129 * @function: Internal signal pad/function to route to IO pin
130 * @value: Initial value for pin - e.g. GPIO output value
131 * @strength: Pin drive strength
132 */
133struct v4l2_subdev_io_pin_config {
134 u32 flags;
135 u8 pin;
136 u8 function;
137 u8 value;
138 u8 strength;
139};
140
141/**
142 * struct v4l2_subdev_core_ops - Define core ops callbacks for subdevs
143 *
144 * @log_status: callback for VIDIOC_LOG_STATUS() ioctl handler code.
145 *
146 * @s_io_pin_config: configure one or more chip I/O pins for chips that
147 * multiplex different internal signal pads out to IO pins. This function
148 * takes a pointer to an array of 'n' pin configuration entries, one for
149 * each pin being configured. This function could be called at times
150 * other than just subdevice initialization.
151 *
152 * @init: initialize the sensor registers to some sort of reasonable default
153 * values. Do not use for new drivers and should be removed in existing
154 * drivers.
155 *
156 * @load_fw: load firmware.
157 *
158 * @reset: generic reset command. The argument selects which subsystems to
159 * reset. Passing 0 will always reset the whole chip. Do not use for new
160 * drivers without discussing this first on the linux-media mailinglist.
161 * There should be no reason normally to reset a device.
162 *
163 * @s_gpio: set GPIO pins. Very simple right now, might need to be extended with
164 * a direction argument if needed.
165 *
166 * @command: called by in-kernel drivers in order to call functions internal
167 * to subdev drivers driver that have a separate callback.
168 *
169 * @ioctl: called at the end of ioctl() syscall handler at the V4L2 core.
170 * used to provide support for private ioctls used on the driver.
171 *
172 * @compat_ioctl32: called when a 32 bits application uses a 64 bits Kernel,
173 * in order to fix data passed from/to userspace.
174 *
175 * @g_register: callback for VIDIOC_DBG_G_REGISTER() ioctl handler code.
176 *
177 * @s_register: callback for VIDIOC_DBG_S_REGISTER() ioctl handler code.
178 *
179 * @s_power: puts subdevice in power saving mode (on == 0) or normal operation
180 * mode (on == 1). DEPRECATED. See
181 * Documentation/driver-api/media/camera-sensor.rst . pre_streamon and
182 * post_streamoff callbacks can be used for e.g. setting the bus to LP-11
183 * mode before s_stream is called.
184 *
185 * @interrupt_service_routine: Called by the bridge chip's interrupt service
186 * handler, when an interrupt status has be raised due to this subdev,
187 * so that this subdev can handle the details. It may schedule work to be
188 * performed later. It must not sleep. **Called from an IRQ context**.
189 *
190 * @subscribe_event: used by the drivers to request the control framework that
191 * for it to be warned when the value of a control changes.
192 *
193 * @unsubscribe_event: remove event subscription from the control framework.
194 */
195struct v4l2_subdev_core_ops {
196 int (*log_status)(struct v4l2_subdev *sd);
197 int (*s_io_pin_config)(struct v4l2_subdev *sd, size_t n,
198 struct v4l2_subdev_io_pin_config *pincfg);
199 int (*init)(struct v4l2_subdev *sd, u32 val);
200 int (*load_fw)(struct v4l2_subdev *sd);
201 int (*reset)(struct v4l2_subdev *sd, u32 val);
202 int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
203 long (*command)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
204 long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
205#ifdef CONFIG_COMPAT
206 long (*compat_ioctl32)(struct v4l2_subdev *sd, unsigned int cmd,
207 unsigned long arg);
208#endif
209#ifdef CONFIG_VIDEO_ADV_DEBUG
210 int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
211 int (*s_register)(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg);
212#endif
213 int (*s_power)(struct v4l2_subdev *sd, int on);
214 int (*interrupt_service_routine)(struct v4l2_subdev *sd,
215 u32 status, bool *handled);
216 int (*subscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
217 struct v4l2_event_subscription *sub);
218 int (*unsubscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
219 struct v4l2_event_subscription *sub);
220};
221
222/**
223 * struct v4l2_subdev_tuner_ops - Callbacks used when v4l device was opened
224 * in radio mode.
225 *
226 * @standby: puts the tuner in standby mode. It will be woken up
227 * automatically the next time it is used.
228 *
229 * @s_radio: callback that switches the tuner to radio mode.
230 * drivers should explicitly call it when a tuner ops should
231 * operate on radio mode, before being able to handle it.
232 * Used on devices that have both AM/FM radio receiver and TV.
233 *
234 * @s_frequency: callback for VIDIOC_S_FREQUENCY() ioctl handler code.
235 *
236 * @g_frequency: callback for VIDIOC_G_FREQUENCY() ioctl handler code.
237 * freq->type must be filled in. Normally done by video_ioctl2()
238 * or the bridge driver.
239 *
240 * @enum_freq_bands: callback for VIDIOC_ENUM_FREQ_BANDS() ioctl handler code.
241 *
242 * @g_tuner: callback for VIDIOC_G_TUNER() ioctl handler code.
243 *
244 * @s_tuner: callback for VIDIOC_S_TUNER() ioctl handler code. @vt->type must be
245 * filled in. Normally done by video_ioctl2 or the
246 * bridge driver.
247 *
248 * @g_modulator: callback for VIDIOC_G_MODULATOR() ioctl handler code.
249 *
250 * @s_modulator: callback for VIDIOC_S_MODULATOR() ioctl handler code.
251 *
252 * @s_type_addr: sets tuner type and its I2C addr.
253 *
254 * @s_config: sets tda9887 specific stuff, like port1, port2 and qss
255 *
256 * .. note::
257 *
258 * On devices that have both AM/FM and TV, it is up to the driver
259 * to explicitly call s_radio when the tuner should be switched to
260 * radio mode, before handling other &struct v4l2_subdev_tuner_ops
261 * that would require it. An example of such usage is::
262 *
263 * static void s_frequency(void *priv, const struct v4l2_frequency *f)
264 * {
265 * ...
266 * if (f.type == V4L2_TUNER_RADIO)
267 * v4l2_device_call_all(v4l2_dev, 0, tuner, s_radio);
268 * ...
269 * v4l2_device_call_all(v4l2_dev, 0, tuner, s_frequency);
270 * }
271 */
272struct v4l2_subdev_tuner_ops {
273 int (*standby)(struct v4l2_subdev *sd);
274 int (*s_radio)(struct v4l2_subdev *sd);
275 int (*s_frequency)(struct v4l2_subdev *sd, const struct v4l2_frequency *freq);
276 int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
277 int (*enum_freq_bands)(struct v4l2_subdev *sd, struct v4l2_frequency_band *band);
278 int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
279 int (*s_tuner)(struct v4l2_subdev *sd, const struct v4l2_tuner *vt);
280 int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
281 int (*s_modulator)(struct v4l2_subdev *sd, const struct v4l2_modulator *vm);
282 int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
283 int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
284};
285
286/**
287 * struct v4l2_subdev_audio_ops - Callbacks used for audio-related settings
288 *
289 * @s_clock_freq: set the frequency (in Hz) of the audio clock output.
290 * Used to slave an audio processor to the video decoder, ensuring that
291 * audio and video remain synchronized. Usual values for the frequency
292 * are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
293 * -EINVAL is returned.
294 *
295 * @s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
296 * way to select I2S clock used by driving digital audio streams at some
297 * board designs. Usual values for the frequency are 1024000 and 2048000.
298 * If the frequency is not supported, then %-EINVAL is returned.
299 *
300 * @s_routing: used to define the input and/or output pins of an audio chip,
301 * and any additional configuration data.
302 * Never attempt to use user-level input IDs (e.g. Composite, S-Video,
303 * Tuner) at this level. An i2c device shouldn't know about whether an
304 * input pin is connected to a Composite connector, become on another
305 * board or platform it might be connected to something else entirely.
306 * The calling driver is responsible for mapping a user-level input to
307 * the right pins on the i2c device.
308 *
309 * @s_stream: used to notify the audio code that stream will start or has
310 * stopped.
311 */
312struct v4l2_subdev_audio_ops {
313 int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
314 int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
315 int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
316 int (*s_stream)(struct v4l2_subdev *sd, int enable);
317};
318
319/**
320 * struct v4l2_mbus_frame_desc_entry_csi2
321 *
322 * @vc: CSI-2 virtual channel
323 * @dt: CSI-2 data type ID
324 */
325struct v4l2_mbus_frame_desc_entry_csi2 {
326 u8 vc;
327 u8 dt;
328};
329
330/**
331 * enum v4l2_mbus_frame_desc_flags - media bus frame description flags
332 *
333 * @V4L2_MBUS_FRAME_DESC_FL_LEN_MAX:
334 * Indicates that &struct v4l2_mbus_frame_desc_entry->length field
335 * specifies maximum data length.
336 * @V4L2_MBUS_FRAME_DESC_FL_BLOB:
337 * Indicates that the format does not have line offsets, i.e.
338 * the receiver should use 1D DMA.
339 */
340enum v4l2_mbus_frame_desc_flags {
341 V4L2_MBUS_FRAME_DESC_FL_LEN_MAX = BIT(0),
342 V4L2_MBUS_FRAME_DESC_FL_BLOB = BIT(1),
343};
344
345/**
346 * struct v4l2_mbus_frame_desc_entry - media bus frame description structure
347 *
348 * @flags: bitmask flags, as defined by &enum v4l2_mbus_frame_desc_flags.
349 * @stream: stream in routing configuration
350 * @pixelcode: media bus pixel code, valid if @flags
351 * %FRAME_DESC_FL_BLOB is not set.
352 * @length: number of octets per frame, valid if @flags
353 * %V4L2_MBUS_FRAME_DESC_FL_LEN_MAX is set.
354 * @bus: Bus-specific frame descriptor parameters
355 * @bus.csi2: CSI-2-specific bus configuration
356 */
357struct v4l2_mbus_frame_desc_entry {
358 enum v4l2_mbus_frame_desc_flags flags;
359 u32 stream;
360 u32 pixelcode;
361 u32 length;
362 union {
363 struct v4l2_mbus_frame_desc_entry_csi2 csi2;
364 } bus;
365};
366
367 /*
368 * If this number is too small, it should be dropped altogether and the
369 * API switched to a dynamic number of frame descriptor entries.
370 */
371#define V4L2_FRAME_DESC_ENTRY_MAX 8
372
373/**
374 * enum v4l2_mbus_frame_desc_type - media bus frame description type
375 *
376 * @V4L2_MBUS_FRAME_DESC_TYPE_UNDEFINED:
377 * Undefined frame desc type. Drivers should not use this, it is
378 * for backwards compatibility.
379 * @V4L2_MBUS_FRAME_DESC_TYPE_PARALLEL:
380 * Parallel media bus.
381 * @V4L2_MBUS_FRAME_DESC_TYPE_CSI2:
382 * CSI-2 media bus. Frame desc parameters must be set in
383 * &struct v4l2_mbus_frame_desc_entry->csi2.
384 */
385enum v4l2_mbus_frame_desc_type {
386 V4L2_MBUS_FRAME_DESC_TYPE_UNDEFINED = 0,
387 V4L2_MBUS_FRAME_DESC_TYPE_PARALLEL,
388 V4L2_MBUS_FRAME_DESC_TYPE_CSI2,
389};
390
391/**
392 * struct v4l2_mbus_frame_desc - media bus data frame description
393 * @type: type of the bus (enum v4l2_mbus_frame_desc_type)
394 * @entry: frame descriptors array
395 * @num_entries: number of entries in @entry array
396 */
397struct v4l2_mbus_frame_desc {
398 enum v4l2_mbus_frame_desc_type type;
399 struct v4l2_mbus_frame_desc_entry entry[V4L2_FRAME_DESC_ENTRY_MAX];
400 unsigned short num_entries;
401};
402
403/**
404 * enum v4l2_subdev_pre_streamon_flags - Flags for pre_streamon subdev core op
405 *
406 * @V4L2_SUBDEV_PRE_STREAMON_FL_MANUAL_LP: Set the transmitter to either LP-11
407 * or LP-111 mode before call to s_stream().
408 */
409enum v4l2_subdev_pre_streamon_flags {
410 V4L2_SUBDEV_PRE_STREAMON_FL_MANUAL_LP = BIT(0),
411};
412
413/**
414 * struct v4l2_subdev_video_ops - Callbacks used when v4l device was opened
415 * in video mode.
416 *
417 * @s_routing: see s_routing in audio_ops, except this version is for video
418 * devices.
419 *
420 * @s_crystal_freq: sets the frequency of the crystal used to generate the
421 * clocks in Hz. An extra flags field allows device specific configuration
422 * regarding clock frequency dividers, etc. If not used, then set flags
423 * to 0. If the frequency is not supported, then -EINVAL is returned.
424 *
425 * @g_std: callback for VIDIOC_G_STD() ioctl handler code.
426 *
427 * @s_std: callback for VIDIOC_S_STD() ioctl handler code.
428 *
429 * @s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
430 * video input devices.
431 *
432 * @g_std_output: get current standard for video OUTPUT devices. This is ignored
433 * by video input devices.
434 *
435 * @querystd: callback for VIDIOC_QUERYSTD() ioctl handler code.
436 *
437 * @g_tvnorms: get &v4l2_std_id with all standards supported by the video
438 * CAPTURE device. This is ignored by video output devices.
439 *
440 * @g_tvnorms_output: get v4l2_std_id with all standards supported by the video
441 * OUTPUT device. This is ignored by video capture devices.
442 *
443 * @g_input_status: get input status. Same as the status field in the
444 * &struct v4l2_input
445 *
446 * @s_stream: start (enabled == 1) or stop (enabled == 0) streaming on the
447 * sub-device. Failure on stop will remove any resources acquired in
448 * streaming start, while the error code is still returned by the driver.
449 * The caller shall track the subdev state, and shall not start or stop an
450 * already started or stopped subdev. Also see call_s_stream wrapper in
451 * v4l2-subdev.c.
452 *
453 * @g_pixelaspect: callback to return the pixelaspect ratio.
454 *
455 * @s_dv_timings: Set custom dv timings in the sub device. This is used
456 * when sub device is capable of setting detailed timing information
457 * in the hardware to generate/detect the video signal.
458 *
459 * @g_dv_timings: Get custom dv timings in the sub device.
460 *
461 * @query_dv_timings: callback for VIDIOC_QUERY_DV_TIMINGS() ioctl handler code.
462 *
463 * @s_rx_buffer: set a host allocated memory buffer for the subdev. The subdev
464 * can adjust @size to a lower value and must not write more data to the
465 * buffer starting at @data than the original value of @size.
466 *
467 * @pre_streamon: May be called before streaming is actually started, to help
468 * initialising the bus. Current usage is to set a CSI-2 transmitter to
469 * LP-11 or LP-111 mode before streaming. See &enum
470 * v4l2_subdev_pre_streamon_flags.
471 *
472 * pre_streamon shall return error if it cannot perform the operation as
473 * indicated by the flags argument. In particular, -EACCES indicates lack
474 * of support for the operation. The caller shall call post_streamoff for
475 * each successful call of pre_streamon.
476 *
477 * @post_streamoff: Called after streaming is stopped, but if and only if
478 * pre_streamon was called earlier.
479 */
480struct v4l2_subdev_video_ops {
481 int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
482 int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
483 int (*g_std)(struct v4l2_subdev *sd, v4l2_std_id *norm);
484 int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
485 int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
486 int (*g_std_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
487 int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
488 int (*g_tvnorms)(struct v4l2_subdev *sd, v4l2_std_id *std);
489 int (*g_tvnorms_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
490 int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
491 int (*s_stream)(struct v4l2_subdev *sd, int enable);
492 int (*g_pixelaspect)(struct v4l2_subdev *sd, struct v4l2_fract *aspect);
493 int (*s_dv_timings)(struct v4l2_subdev *sd,
494 struct v4l2_dv_timings *timings);
495 int (*g_dv_timings)(struct v4l2_subdev *sd,
496 struct v4l2_dv_timings *timings);
497 int (*query_dv_timings)(struct v4l2_subdev *sd,
498 struct v4l2_dv_timings *timings);
499 int (*s_rx_buffer)(struct v4l2_subdev *sd, void *buf,
500 unsigned int *size);
501 int (*pre_streamon)(struct v4l2_subdev *sd, u32 flags);
502 int (*post_streamoff)(struct v4l2_subdev *sd);
503};
504
505/**
506 * struct v4l2_subdev_vbi_ops - Callbacks used when v4l device was opened
507 * in video mode via the vbi device node.
508 *
509 * @decode_vbi_line: video decoders that support sliced VBI need to implement
510 * this ioctl. Field p of the &struct v4l2_decode_vbi_line is set to the
511 * start of the VBI data that was generated by the decoder. The driver
512 * then parses the sliced VBI data and sets the other fields in the
513 * struct accordingly. The pointer p is updated to point to the start of
514 * the payload which can be copied verbatim into the data field of the
515 * &struct v4l2_sliced_vbi_data. If no valid VBI data was found, then the
516 * type field is set to 0 on return.
517 *
518 * @s_vbi_data: used to generate VBI signals on a video signal.
519 * &struct v4l2_sliced_vbi_data is filled with the data packets that
520 * should be output. Note that if you set the line field to 0, then that
521 * VBI signal is disabled. If no valid VBI data was found, then the type
522 * field is set to 0 on return.
523 *
524 * @g_vbi_data: used to obtain the sliced VBI packet from a readback register.
525 * Not all video decoders support this. If no data is available because
526 * the readback register contains invalid or erroneous data %-EIO is
527 * returned. Note that you must fill in the 'id' member and the 'field'
528 * member (to determine whether CC data from the first or second field
529 * should be obtained).
530 *
531 * @g_sliced_vbi_cap: callback for VIDIOC_G_SLICED_VBI_CAP() ioctl handler
532 * code.
533 *
534 * @s_raw_fmt: setup the video encoder/decoder for raw VBI.
535 *
536 * @g_sliced_fmt: retrieve the current sliced VBI settings.
537 *
538 * @s_sliced_fmt: setup the sliced VBI settings.
539 */
540struct v4l2_subdev_vbi_ops {
541 int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
542 int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
543 int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
544 int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
545 int (*s_raw_fmt)(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt);
546 int (*g_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
547 int (*s_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
548};
549
550/**
551 * struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
552 * @g_skip_top_lines: number of lines at the top of the image to be skipped.
553 * This is needed for some sensors, which always corrupt
554 * several top lines of the output image, or which send their
555 * metadata in them.
556 * @g_skip_frames: number of frames to skip at stream start. This is needed for
557 * buggy sensors that generate faulty frames when they are
558 * turned on.
559 */
560struct v4l2_subdev_sensor_ops {
561 int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
562 int (*g_skip_frames)(struct v4l2_subdev *sd, u32 *frames);
563};
564
565/**
566 * enum v4l2_subdev_ir_mode- describes the type of IR supported
567 *
568 * @V4L2_SUBDEV_IR_MODE_PULSE_WIDTH: IR uses struct ir_raw_event records
569 */
570enum v4l2_subdev_ir_mode {
571 V4L2_SUBDEV_IR_MODE_PULSE_WIDTH,
572};
573
574/**
575 * struct v4l2_subdev_ir_parameters - Parameters for IR TX or TX
576 *
577 * @bytes_per_data_element: bytes per data element of data in read or
578 * write call.
579 * @mode: IR mode as defined by &enum v4l2_subdev_ir_mode.
580 * @enable: device is active if true
581 * @interrupt_enable: IR interrupts are enabled if true
582 * @shutdown: if true: set hardware to low/no power, false: normal mode
583 *
584 * @modulation: if true, it uses carrier, if false: baseband
585 * @max_pulse_width: maximum pulse width in ns, valid only for baseband signal
586 * @carrier_freq: carrier frequency in Hz, valid only for modulated signal
587 * @duty_cycle: duty cycle percentage, valid only for modulated signal
588 * @invert_level: invert signal level
589 *
590 * @invert_carrier_sense: Send 0/space as a carrier burst. used only in TX.
591 *
592 * @noise_filter_min_width: min time of a valid pulse, in ns. Used only for RX.
593 * @carrier_range_lower: Lower carrier range, in Hz, valid only for modulated
594 * signal. Used only for RX.
595 * @carrier_range_upper: Upper carrier range, in Hz, valid only for modulated
596 * signal. Used only for RX.
597 * @resolution: The receive resolution, in ns . Used only for RX.
598 */
599struct v4l2_subdev_ir_parameters {
600 unsigned int bytes_per_data_element;
601 enum v4l2_subdev_ir_mode mode;
602
603 bool enable;
604 bool interrupt_enable;
605 bool shutdown;
606
607 bool modulation;
608 u32 max_pulse_width;
609 unsigned int carrier_freq;
610 unsigned int duty_cycle;
611 bool invert_level;
612
613 /* Tx only */
614 bool invert_carrier_sense;
615
616 /* Rx only */
617 u32 noise_filter_min_width;
618 unsigned int carrier_range_lower;
619 unsigned int carrier_range_upper;
620 u32 resolution;
621};
622
623/**
624 * struct v4l2_subdev_ir_ops - operations for IR subdevices
625 *
626 * @rx_read: Reads received codes or pulse width data.
627 * The semantics are similar to a non-blocking read() call.
628 * @rx_g_parameters: Get the current operating parameters and state of
629 * the IR receiver.
630 * @rx_s_parameters: Set the current operating parameters and state of
631 * the IR receiver. It is recommended to call
632 * [rt]x_g_parameters first to fill out the current state, and only change
633 * the fields that need to be changed. Upon return, the actual device
634 * operating parameters and state will be returned. Note that hardware
635 * limitations may prevent the actual settings from matching the requested
636 * settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
637 * was requested. An exception is when the shutdown parameter is true.
638 * The last used operational parameters will be returned, but the actual
639 * state of the hardware be different to minimize power consumption and
640 * processing when shutdown is true.
641 *
642 * @tx_write: Writes codes or pulse width data for transmission.
643 * The semantics are similar to a non-blocking write() call.
644 * @tx_g_parameters: Get the current operating parameters and state of
645 * the IR transmitter.
646 * @tx_s_parameters: Set the current operating parameters and state of
647 * the IR transmitter. It is recommended to call
648 * [rt]x_g_parameters first to fill out the current state, and only change
649 * the fields that need to be changed. Upon return, the actual device
650 * operating parameters and state will be returned. Note that hardware
651 * limitations may prevent the actual settings from matching the requested
652 * settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
653 * was requested. An exception is when the shutdown parameter is true.
654 * The last used operational parameters will be returned, but the actual
655 * state of the hardware be different to minimize power consumption and
656 * processing when shutdown is true.
657 */
658struct v4l2_subdev_ir_ops {
659 /* Receiver */
660 int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
661 ssize_t *num);
662
663 int (*rx_g_parameters)(struct v4l2_subdev *sd,
664 struct v4l2_subdev_ir_parameters *params);
665 int (*rx_s_parameters)(struct v4l2_subdev *sd,
666 struct v4l2_subdev_ir_parameters *params);
667
668 /* Transmitter */
669 int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
670 ssize_t *num);
671
672 int (*tx_g_parameters)(struct v4l2_subdev *sd,
673 struct v4l2_subdev_ir_parameters *params);
674 int (*tx_s_parameters)(struct v4l2_subdev *sd,
675 struct v4l2_subdev_ir_parameters *params);
676};
677
678/**
679 * struct v4l2_subdev_pad_config - Used for storing subdev pad information.
680 *
681 * @format: &struct v4l2_mbus_framefmt
682 * @crop: &struct v4l2_rect to be used for crop
683 * @compose: &struct v4l2_rect to be used for compose
684 * @interval: frame interval
685 */
686struct v4l2_subdev_pad_config {
687 struct v4l2_mbus_framefmt format;
688 struct v4l2_rect crop;
689 struct v4l2_rect compose;
690 struct v4l2_fract interval;
691};
692
693/**
694 * struct v4l2_subdev_stream_config - Used for storing stream configuration.
695 *
696 * @pad: pad number
697 * @stream: stream number
698 * @enabled: has the stream been enabled with v4l2_subdev_enable_stream()
699 * @fmt: &struct v4l2_mbus_framefmt
700 * @crop: &struct v4l2_rect to be used for crop
701 * @compose: &struct v4l2_rect to be used for compose
702 * @interval: frame interval
703 *
704 * This structure stores configuration for a stream.
705 */
706struct v4l2_subdev_stream_config {
707 u32 pad;
708 u32 stream;
709 bool enabled;
710
711 struct v4l2_mbus_framefmt fmt;
712 struct v4l2_rect crop;
713 struct v4l2_rect compose;
714 struct v4l2_fract interval;
715};
716
717/**
718 * struct v4l2_subdev_stream_configs - A collection of stream configs.
719 *
720 * @num_configs: number of entries in @config.
721 * @configs: an array of &struct v4l2_subdev_stream_configs.
722 */
723struct v4l2_subdev_stream_configs {
724 u32 num_configs;
725 struct v4l2_subdev_stream_config *configs;
726};
727
728/**
729 * struct v4l2_subdev_krouting - subdev routing table
730 *
731 * @num_routes: number of routes
732 * @routes: &struct v4l2_subdev_route
733 *
734 * This structure contains the routing table for a subdev.
735 */
736struct v4l2_subdev_krouting {
737 unsigned int num_routes;
738 struct v4l2_subdev_route *routes;
739};
740
741/**
742 * struct v4l2_subdev_state - Used for storing subdev state information.
743 *
744 * @_lock: default for 'lock'
745 * @lock: mutex for the state. May be replaced by the user.
746 * @sd: the sub-device which the state is related to
747 * @pads: &struct v4l2_subdev_pad_config array
748 * @routing: routing table for the subdev
749 * @stream_configs: stream configurations (only for V4L2_SUBDEV_FL_STREAMS)
750 *
751 * This structure only needs to be passed to the pad op if the 'which' field
752 * of the main argument is set to %V4L2_SUBDEV_FORMAT_TRY. For
753 * %V4L2_SUBDEV_FORMAT_ACTIVE it is safe to pass %NULL.
754 */
755struct v4l2_subdev_state {
756 /* lock for the struct v4l2_subdev_state fields */
757 struct mutex _lock;
758 struct mutex *lock;
759 struct v4l2_subdev *sd;
760 struct v4l2_subdev_pad_config *pads;
761 struct v4l2_subdev_krouting routing;
762 struct v4l2_subdev_stream_configs stream_configs;
763};
764
765/**
766 * struct v4l2_subdev_pad_ops - v4l2-subdev pad level operations
767 *
768 * @enum_mbus_code: callback for VIDIOC_SUBDEV_ENUM_MBUS_CODE() ioctl handler
769 * code.
770 * @enum_frame_size: callback for VIDIOC_SUBDEV_ENUM_FRAME_SIZE() ioctl handler
771 * code.
772 *
773 * @enum_frame_interval: callback for VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL() ioctl
774 * handler code.
775 *
776 * @get_fmt: callback for VIDIOC_SUBDEV_G_FMT() ioctl handler code.
777 *
778 * @set_fmt: callback for VIDIOC_SUBDEV_S_FMT() ioctl handler code.
779 *
780 * @get_selection: callback for VIDIOC_SUBDEV_G_SELECTION() ioctl handler code.
781 *
782 * @set_selection: callback for VIDIOC_SUBDEV_S_SELECTION() ioctl handler code.
783 *
784 * @get_frame_interval: callback for VIDIOC_SUBDEV_G_FRAME_INTERVAL()
785 * ioctl handler code.
786 *
787 * @set_frame_interval: callback for VIDIOC_SUBDEV_S_FRAME_INTERVAL()
788 * ioctl handler code.
789 *
790 * @get_edid: callback for VIDIOC_SUBDEV_G_EDID() ioctl handler code.
791 *
792 * @set_edid: callback for VIDIOC_SUBDEV_S_EDID() ioctl handler code.
793 *
794 * @dv_timings_cap: callback for VIDIOC_SUBDEV_DV_TIMINGS_CAP() ioctl handler
795 * code.
796 *
797 * @enum_dv_timings: callback for VIDIOC_SUBDEV_ENUM_DV_TIMINGS() ioctl handler
798 * code.
799 *
800 * @link_validate: used by the media controller code to check if the links
801 * that belongs to a pipeline can be used for stream.
802 *
803 * @get_frame_desc: get the current low level media bus frame parameters.
804 *
805 * @set_frame_desc: set the low level media bus frame parameters, @fd array
806 * may be adjusted by the subdev driver to device capabilities.
807 *
808 * @get_mbus_config: get the media bus configuration of a remote sub-device.
809 * The media bus configuration is usually retrieved from the
810 * firmware interface at sub-device probe time, immediately
811 * applied to the hardware and eventually adjusted by the
812 * driver. Remote sub-devices (usually video receivers) shall
813 * use this operation to query the transmitting end bus
814 * configuration in order to adjust their own one accordingly.
815 * Callers should make sure they get the most up-to-date as
816 * possible configuration from the remote end, likely calling
817 * this operation as close as possible to stream on time. The
818 * operation shall fail if the pad index it has been called on
819 * is not valid or in case of unrecoverable failures.
820 *
821 * @set_routing: Enable or disable data connection routes described in the
822 * subdevice routing table. Subdevs that implement this operation
823 * must set the V4L2_SUBDEV_FL_STREAMS flag.
824 *
825 * @enable_streams: Enable the streams defined in streams_mask on the given
826 * source pad. Subdevs that implement this operation must use the active
827 * state management provided by the subdev core (enabled through a call to
828 * v4l2_subdev_init_finalize() at initialization time). Do not call
829 * directly, use v4l2_subdev_enable_streams() instead.
830 *
831 * @disable_streams: Disable the streams defined in streams_mask on the given
832 * source pad. Subdevs that implement this operation must use the active
833 * state management provided by the subdev core (enabled through a call to
834 * v4l2_subdev_init_finalize() at initialization time). Do not call
835 * directly, use v4l2_subdev_disable_streams() instead.
836 */
837struct v4l2_subdev_pad_ops {
838 int (*enum_mbus_code)(struct v4l2_subdev *sd,
839 struct v4l2_subdev_state *state,
840 struct v4l2_subdev_mbus_code_enum *code);
841 int (*enum_frame_size)(struct v4l2_subdev *sd,
842 struct v4l2_subdev_state *state,
843 struct v4l2_subdev_frame_size_enum *fse);
844 int (*enum_frame_interval)(struct v4l2_subdev *sd,
845 struct v4l2_subdev_state *state,
846 struct v4l2_subdev_frame_interval_enum *fie);
847 int (*get_fmt)(struct v4l2_subdev *sd,
848 struct v4l2_subdev_state *state,
849 struct v4l2_subdev_format *format);
850 int (*set_fmt)(struct v4l2_subdev *sd,
851 struct v4l2_subdev_state *state,
852 struct v4l2_subdev_format *format);
853 int (*get_selection)(struct v4l2_subdev *sd,
854 struct v4l2_subdev_state *state,
855 struct v4l2_subdev_selection *sel);
856 int (*set_selection)(struct v4l2_subdev *sd,
857 struct v4l2_subdev_state *state,
858 struct v4l2_subdev_selection *sel);
859 int (*get_frame_interval)(struct v4l2_subdev *sd,
860 struct v4l2_subdev_state *state,
861 struct v4l2_subdev_frame_interval *interval);
862 int (*set_frame_interval)(struct v4l2_subdev *sd,
863 struct v4l2_subdev_state *state,
864 struct v4l2_subdev_frame_interval *interval);
865 int (*get_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
866 int (*set_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
867 int (*dv_timings_cap)(struct v4l2_subdev *sd,
868 struct v4l2_dv_timings_cap *cap);
869 int (*enum_dv_timings)(struct v4l2_subdev *sd,
870 struct v4l2_enum_dv_timings *timings);
871#ifdef CONFIG_MEDIA_CONTROLLER
872 int (*link_validate)(struct v4l2_subdev *sd, struct media_link *link,
873 struct v4l2_subdev_format *source_fmt,
874 struct v4l2_subdev_format *sink_fmt);
875#endif /* CONFIG_MEDIA_CONTROLLER */
876 int (*get_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
877 struct v4l2_mbus_frame_desc *fd);
878 int (*set_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
879 struct v4l2_mbus_frame_desc *fd);
880 int (*get_mbus_config)(struct v4l2_subdev *sd, unsigned int pad,
881 struct v4l2_mbus_config *config);
882 int (*set_routing)(struct v4l2_subdev *sd,
883 struct v4l2_subdev_state *state,
884 enum v4l2_subdev_format_whence which,
885 struct v4l2_subdev_krouting *route);
886 int (*enable_streams)(struct v4l2_subdev *sd,
887 struct v4l2_subdev_state *state, u32 pad,
888 u64 streams_mask);
889 int (*disable_streams)(struct v4l2_subdev *sd,
890 struct v4l2_subdev_state *state, u32 pad,
891 u64 streams_mask);
892};
893
894/**
895 * struct v4l2_subdev_ops - Subdev operations
896 *
897 * @core: pointer to &struct v4l2_subdev_core_ops. Can be %NULL
898 * @tuner: pointer to &struct v4l2_subdev_tuner_ops. Can be %NULL
899 * @audio: pointer to &struct v4l2_subdev_audio_ops. Can be %NULL
900 * @video: pointer to &struct v4l2_subdev_video_ops. Can be %NULL
901 * @vbi: pointer to &struct v4l2_subdev_vbi_ops. Can be %NULL
902 * @ir: pointer to &struct v4l2_subdev_ir_ops. Can be %NULL
903 * @sensor: pointer to &struct v4l2_subdev_sensor_ops. Can be %NULL
904 * @pad: pointer to &struct v4l2_subdev_pad_ops. Can be %NULL
905 */
906struct v4l2_subdev_ops {
907 const struct v4l2_subdev_core_ops *core;
908 const struct v4l2_subdev_tuner_ops *tuner;
909 const struct v4l2_subdev_audio_ops *audio;
910 const struct v4l2_subdev_video_ops *video;
911 const struct v4l2_subdev_vbi_ops *vbi;
912 const struct v4l2_subdev_ir_ops *ir;
913 const struct v4l2_subdev_sensor_ops *sensor;
914 const struct v4l2_subdev_pad_ops *pad;
915};
916
917/**
918 * struct v4l2_subdev_internal_ops - V4L2 subdev internal ops
919 *
920 * @init_state: initialize the subdev state to default values
921 *
922 * @registered: called when this subdev is registered. When called the v4l2_dev
923 * field is set to the correct v4l2_device.
924 *
925 * @unregistered: called when this subdev is unregistered. When called the
926 * v4l2_dev field is still set to the correct v4l2_device.
927 *
928 * @open: called when the subdev device node is opened by an application.
929 *
930 * @close: called when the subdev device node is closed. Please note that
931 * it is possible for @close to be called after @unregistered!
932 *
933 * @release: called when the last user of the subdev device is gone. This
934 * happens after the @unregistered callback and when the last open
935 * filehandle to the v4l-subdevX device node was closed. If no device
936 * node was created for this sub-device, then the @release callback
937 * is called right after the @unregistered callback.
938 * The @release callback is typically used to free the memory containing
939 * the v4l2_subdev structure. It is almost certainly required for any
940 * sub-device that sets the V4L2_SUBDEV_FL_HAS_DEVNODE flag.
941 *
942 * .. note::
943 * Never call this from drivers, only the v4l2 framework can call
944 * these ops.
945 */
946struct v4l2_subdev_internal_ops {
947 int (*init_state)(struct v4l2_subdev *sd,
948 struct v4l2_subdev_state *state);
949 int (*registered)(struct v4l2_subdev *sd);
950 void (*unregistered)(struct v4l2_subdev *sd);
951 int (*open)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
952 int (*close)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
953 void (*release)(struct v4l2_subdev *sd);
954};
955
956/* Set this flag if this subdev is a i2c device. */
957#define V4L2_SUBDEV_FL_IS_I2C (1U << 0)
958/* Set this flag if this subdev is a spi device. */
959#define V4L2_SUBDEV_FL_IS_SPI (1U << 1)
960/* Set this flag if this subdev needs a device node. */
961#define V4L2_SUBDEV_FL_HAS_DEVNODE (1U << 2)
962/*
963 * Set this flag if this subdev generates events.
964 * Note controls can send events, thus drivers exposing controls
965 * should set this flag.
966 */
967#define V4L2_SUBDEV_FL_HAS_EVENTS (1U << 3)
968/*
969 * Set this flag if this subdev supports multiplexed streams. This means
970 * that the driver supports routing and handles the stream parameter in its
971 * v4l2_subdev_pad_ops handlers. More specifically, this means:
972 *
973 * - Centrally managed subdev active state is enabled
974 * - Legacy pad config is _not_ supported (state->pads is NULL)
975 * - Routing ioctls are available
976 * - Multiple streams per pad are supported
977 */
978#define V4L2_SUBDEV_FL_STREAMS (1U << 4)
979
980struct regulator_bulk_data;
981
982/**
983 * struct v4l2_subdev_platform_data - regulators config struct
984 *
985 * @regulators: Optional regulators used to power on/off the subdevice
986 * @num_regulators: Number of regululators
987 * @host_priv: Per-subdevice data, specific for a certain video host device
988 */
989struct v4l2_subdev_platform_data {
990 struct regulator_bulk_data *regulators;
991 int num_regulators;
992
993 void *host_priv;
994};
995
996/**
997 * struct v4l2_subdev - describes a V4L2 sub-device
998 *
999 * @entity: pointer to &struct media_entity
1000 * @list: List of sub-devices
1001 * @owner: The owner is the same as the driver's &struct device owner.
1002 * @owner_v4l2_dev: true if the &sd->owner matches the owner of @v4l2_dev->dev
1003 * owner. Initialized by v4l2_device_register_subdev().
1004 * @flags: subdev flags. Can be:
1005 * %V4L2_SUBDEV_FL_IS_I2C - Set this flag if this subdev is a i2c device;
1006 * %V4L2_SUBDEV_FL_IS_SPI - Set this flag if this subdev is a spi device;
1007 * %V4L2_SUBDEV_FL_HAS_DEVNODE - Set this flag if this subdev needs a
1008 * device node;
1009 * %V4L2_SUBDEV_FL_HAS_EVENTS - Set this flag if this subdev generates
1010 * events.
1011 *
1012 * @v4l2_dev: pointer to struct &v4l2_device
1013 * @ops: pointer to struct &v4l2_subdev_ops
1014 * @internal_ops: pointer to struct &v4l2_subdev_internal_ops.
1015 * Never call these internal ops from within a driver!
1016 * @ctrl_handler: The control handler of this subdev. May be NULL.
1017 * @name: Name of the sub-device. Please notice that the name must be unique.
1018 * @grp_id: can be used to group similar subdevs. Value is driver-specific
1019 * @dev_priv: pointer to private data
1020 * @host_priv: pointer to private data used by the device where the subdev
1021 * is attached.
1022 * @devnode: subdev device node
1023 * @dev: pointer to the physical device, if any
1024 * @fwnode: The fwnode_handle of the subdev, usually the same as
1025 * either dev->of_node->fwnode or dev->fwnode (whichever is non-NULL).
1026 * @async_list: Links this subdev to a global subdev_list or
1027 * @notifier->done_list list.
1028 * @async_subdev_endpoint_list: List entry in async_subdev_endpoint_entry of
1029 * &struct v4l2_async_subdev_endpoint.
1030 * @subdev_notifier: A sub-device notifier implicitly registered for the sub-
1031 * device using v4l2_async_register_subdev_sensor().
1032 * @asc_list: Async connection list, of &struct
1033 * v4l2_async_connection.subdev_entry.
1034 * @pdata: common part of subdevice platform data
1035 * @state_lock: A pointer to a lock used for all the subdev's states, set by the
1036 * driver. This is optional. If NULL, each state instance will get
1037 * a lock of its own.
1038 * @privacy_led: Optional pointer to a LED classdev for the privacy LED for sensors.
1039 * @active_state: Active state for the subdev (NULL for subdevs tracking the
1040 * state internally). Initialized by calling
1041 * v4l2_subdev_init_finalize().
1042 * @enabled_streams: Bitmask of enabled streams used by
1043 * v4l2_subdev_enable_streams() and
1044 * v4l2_subdev_disable_streams() helper functions for fallback
1045 * cases.
1046 *
1047 * Each instance of a subdev driver should create this struct, either
1048 * stand-alone or embedded in a larger struct.
1049 *
1050 * This structure should be initialized by v4l2_subdev_init() or one of
1051 * its variants: v4l2_spi_subdev_init(), v4l2_i2c_subdev_init().
1052 */
1053struct v4l2_subdev {
1054#if defined(CONFIG_MEDIA_CONTROLLER)
1055 struct media_entity entity;
1056#endif
1057 struct list_head list;
1058 struct module *owner;
1059 bool owner_v4l2_dev;
1060 u32 flags;
1061 struct v4l2_device *v4l2_dev;
1062 const struct v4l2_subdev_ops *ops;
1063 const struct v4l2_subdev_internal_ops *internal_ops;
1064 struct v4l2_ctrl_handler *ctrl_handler;
1065 char name[52];
1066 u32 grp_id;
1067 void *dev_priv;
1068 void *host_priv;
1069 struct video_device *devnode;
1070 struct device *dev;
1071 struct fwnode_handle *fwnode;
1072 struct list_head async_list;
1073 struct list_head async_subdev_endpoint_list;
1074 struct v4l2_async_notifier *subdev_notifier;
1075 struct list_head asc_list;
1076 struct v4l2_subdev_platform_data *pdata;
1077 struct mutex *state_lock;
1078
1079 /*
1080 * The fields below are private, and should only be accessed via
1081 * appropriate functions.
1082 */
1083
1084 struct led_classdev *privacy_led;
1085
1086 /*
1087 * TODO: active_state should most likely be changed from a pointer to an
1088 * embedded field. For the time being it's kept as a pointer to more
1089 * easily catch uses of active_state in the cases where the driver
1090 * doesn't support it.
1091 */
1092 struct v4l2_subdev_state *active_state;
1093 u64 enabled_streams;
1094};
1095
1096
1097/**
1098 * media_entity_to_v4l2_subdev - Returns a &struct v4l2_subdev from
1099 * the &struct media_entity embedded in it.
1100 *
1101 * @ent: pointer to &struct media_entity.
1102 */
1103#define media_entity_to_v4l2_subdev(ent) \
1104({ \
1105 typeof(ent) __me_sd_ent = (ent); \
1106 \
1107 __me_sd_ent ? \
1108 container_of(__me_sd_ent, struct v4l2_subdev, entity) : \
1109 NULL; \
1110})
1111
1112/**
1113 * vdev_to_v4l2_subdev - Returns a &struct v4l2_subdev from
1114 * the &struct video_device embedded on it.
1115 *
1116 * @vdev: pointer to &struct video_device
1117 */
1118#define vdev_to_v4l2_subdev(vdev) \
1119 ((struct v4l2_subdev *)video_get_drvdata(vdev))
1120
1121/**
1122 * struct v4l2_subdev_fh - Used for storing subdev information per file handle
1123 *
1124 * @vfh: pointer to &struct v4l2_fh
1125 * @state: pointer to &struct v4l2_subdev_state
1126 * @owner: module pointer to the owner of this file handle
1127 * @client_caps: bitmask of ``V4L2_SUBDEV_CLIENT_CAP_*``
1128 */
1129struct v4l2_subdev_fh {
1130 struct v4l2_fh vfh;
1131 struct module *owner;
1132#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
1133 struct v4l2_subdev_state *state;
1134 u64 client_caps;
1135#endif
1136};
1137
1138/**
1139 * to_v4l2_subdev_fh - Returns a &struct v4l2_subdev_fh from
1140 * the &struct v4l2_fh embedded on it.
1141 *
1142 * @fh: pointer to &struct v4l2_fh
1143 */
1144#define to_v4l2_subdev_fh(fh) \
1145 container_of(fh, struct v4l2_subdev_fh, vfh)
1146
1147extern const struct v4l2_file_operations v4l2_subdev_fops;
1148
1149/**
1150 * v4l2_set_subdevdata - Sets V4L2 dev private device data
1151 *
1152 * @sd: pointer to &struct v4l2_subdev
1153 * @p: pointer to the private device data to be stored.
1154 */
1155static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
1156{
1157 sd->dev_priv = p;
1158}
1159
1160/**
1161 * v4l2_get_subdevdata - Gets V4L2 dev private device data
1162 *
1163 * @sd: pointer to &struct v4l2_subdev
1164 *
1165 * Returns the pointer to the private device data to be stored.
1166 */
1167static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
1168{
1169 return sd->dev_priv;
1170}
1171
1172/**
1173 * v4l2_set_subdev_hostdata - Sets V4L2 dev private host data
1174 *
1175 * @sd: pointer to &struct v4l2_subdev
1176 * @p: pointer to the private data to be stored.
1177 */
1178static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p)
1179{
1180 sd->host_priv = p;
1181}
1182
1183/**
1184 * v4l2_get_subdev_hostdata - Gets V4L2 dev private data
1185 *
1186 * @sd: pointer to &struct v4l2_subdev
1187 *
1188 * Returns the pointer to the private host data to be stored.
1189 */
1190static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
1191{
1192 return sd->host_priv;
1193}
1194
1195#ifdef CONFIG_MEDIA_CONTROLLER
1196
1197/**
1198 * v4l2_subdev_get_fwnode_pad_1_to_1 - Get pad number from a subdev fwnode
1199 * endpoint, assuming 1:1 port:pad
1200 *
1201 * @entity: Pointer to the subdev entity
1202 * @endpoint: Pointer to a parsed fwnode endpoint
1203 *
1204 * This function can be used as the .get_fwnode_pad operation for
1205 * subdevices that map port numbers and pad indexes 1:1. If the endpoint
1206 * is owned by the subdevice, the function returns the endpoint port
1207 * number.
1208 *
1209 * Returns the endpoint port number on success or a negative error code.
1210 */
1211int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity,
1212 struct fwnode_endpoint *endpoint);
1213
1214/**
1215 * v4l2_subdev_link_validate_default - validates a media link
1216 *
1217 * @sd: pointer to &struct v4l2_subdev
1218 * @link: pointer to &struct media_link
1219 * @source_fmt: pointer to &struct v4l2_subdev_format
1220 * @sink_fmt: pointer to &struct v4l2_subdev_format
1221 *
1222 * This function ensures that width, height and the media bus pixel
1223 * code are equal on both source and sink of the link.
1224 */
1225int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
1226 struct media_link *link,
1227 struct v4l2_subdev_format *source_fmt,
1228 struct v4l2_subdev_format *sink_fmt);
1229
1230/**
1231 * v4l2_subdev_link_validate - validates a media link
1232 *
1233 * @link: pointer to &struct media_link
1234 *
1235 * This function calls the subdev's link_validate ops to validate
1236 * if a media link is valid for streaming. It also internally
1237 * calls v4l2_subdev_link_validate_default() to ensure that
1238 * width, height and the media bus pixel code are equal on both
1239 * source and sink of the link.
1240 */
1241int v4l2_subdev_link_validate(struct media_link *link);
1242
1243/**
1244 * v4l2_subdev_has_pad_interdep - MC has_pad_interdep implementation for subdevs
1245 *
1246 * @entity: pointer to &struct media_entity
1247 * @pad0: pad number for the first pad
1248 * @pad1: pad number for the second pad
1249 *
1250 * This function is an implementation of the
1251 * media_entity_operations.has_pad_interdep operation for subdevs that
1252 * implement the multiplexed streams API (as indicated by the
1253 * V4L2_SUBDEV_FL_STREAMS subdev flag).
1254 *
1255 * It considers two pads interdependent if there is an active route between pad0
1256 * and pad1.
1257 */
1258bool v4l2_subdev_has_pad_interdep(struct media_entity *entity,
1259 unsigned int pad0, unsigned int pad1);
1260
1261/**
1262 * __v4l2_subdev_state_alloc - allocate v4l2_subdev_state
1263 *
1264 * @sd: pointer to &struct v4l2_subdev for which the state is being allocated.
1265 * @lock_name: name of the state lock
1266 * @key: lock_class_key for the lock
1267 *
1268 * Must call __v4l2_subdev_state_free() when state is no longer needed.
1269 *
1270 * Not to be called directly by the drivers.
1271 */
1272struct v4l2_subdev_state *__v4l2_subdev_state_alloc(struct v4l2_subdev *sd,
1273 const char *lock_name,
1274 struct lock_class_key *key);
1275
1276/**
1277 * __v4l2_subdev_state_free - free a v4l2_subdev_state
1278 *
1279 * @state: v4l2_subdev_state to be freed.
1280 *
1281 * Not to be called directly by the drivers.
1282 */
1283void __v4l2_subdev_state_free(struct v4l2_subdev_state *state);
1284
1285/**
1286 * v4l2_subdev_init_finalize() - Finalizes the initialization of the subdevice
1287 * @sd: The subdev
1288 *
1289 * This function finalizes the initialization of the subdev, including
1290 * allocation of the active state for the subdev.
1291 *
1292 * This function must be called by the subdev drivers that use the centralized
1293 * active state, after the subdev struct has been initialized and
1294 * media_entity_pads_init() has been called, but before registering the
1295 * subdev.
1296 *
1297 * The user must call v4l2_subdev_cleanup() when the subdev is being removed.
1298 */
1299#define v4l2_subdev_init_finalize(sd) \
1300 ({ \
1301 static struct lock_class_key __key; \
1302 const char *name = KBUILD_BASENAME \
1303 ":" __stringify(__LINE__) ":sd->active_state->lock"; \
1304 __v4l2_subdev_init_finalize(sd, name, &__key); \
1305 })
1306
1307int __v4l2_subdev_init_finalize(struct v4l2_subdev *sd, const char *name,
1308 struct lock_class_key *key);
1309
1310/**
1311 * v4l2_subdev_cleanup() - Releases the resources allocated by the subdevice
1312 * @sd: The subdevice
1313 *
1314 * Clean up a V4L2 async sub-device. Must be called for a sub-device as part of
1315 * its release if resources have been associated with it using
1316 * v4l2_async_subdev_endpoint_add() or v4l2_subdev_init_finalize().
1317 */
1318void v4l2_subdev_cleanup(struct v4l2_subdev *sd);
1319
1320/*
1321 * A macro to generate the macro or function name for sub-devices state access
1322 * wrapper macros below.
1323 */
1324#define __v4l2_subdev_state_gen_call(NAME, _1, ARG, ...) \
1325 __v4l2_subdev_state_get_ ## NAME ## ARG
1326
1327/**
1328 * v4l2_subdev_state_get_format() - Get pointer to a stream format
1329 * @state: subdevice state
1330 * @pad: pad id
1331 * @...: stream id (optional argument)
1332 *
1333 * This returns a pointer to &struct v4l2_mbus_framefmt for the given pad +
1334 * stream in the subdev state.
1335 *
1336 * For stream-unaware drivers the format for the corresponding pad is returned.
1337 * If the pad does not exist, NULL is returned.
1338 */
1339/*
1340 * Wrap v4l2_subdev_state_get_format(), allowing the function to be called with
1341 * two or three arguments. The purpose of the __v4l2_subdev_state_get_format()
1342 * macro below is to come up with the name of the function or macro to call,
1343 * using the last two arguments (_stream and _pad). The selected function or
1344 * macro is then called using the arguments specified by the caller. A similar
1345 * arrangement is used for v4l2_subdev_state_crop() and
1346 * v4l2_subdev_state_compose() below.
1347 */
1348#define v4l2_subdev_state_get_format(state, pad, ...) \
1349 __v4l2_subdev_state_gen_call(format, ##__VA_ARGS__, , _pad) \
1350 (state, pad, ##__VA_ARGS__)
1351#define __v4l2_subdev_state_get_format_pad(state, pad) \
1352 __v4l2_subdev_state_get_format(state, pad, 0)
1353struct v4l2_mbus_framefmt *
1354__v4l2_subdev_state_get_format(struct v4l2_subdev_state *state,
1355 unsigned int pad, u32 stream);
1356
1357/**
1358 * v4l2_subdev_state_get_crop() - Get pointer to a stream crop rectangle
1359 * @state: subdevice state
1360 * @pad: pad id
1361 * @...: stream id (optional argument)
1362 *
1363 * This returns a pointer to crop rectangle for the given pad + stream in the
1364 * subdev state.
1365 *
1366 * For stream-unaware drivers the crop rectangle for the corresponding pad is
1367 * returned. If the pad does not exist, NULL is returned.
1368 */
1369#define v4l2_subdev_state_get_crop(state, pad, ...) \
1370 __v4l2_subdev_state_gen_call(crop, ##__VA_ARGS__, , _pad) \
1371 (state, pad, ##__VA_ARGS__)
1372#define __v4l2_subdev_state_get_crop_pad(state, pad) \
1373 __v4l2_subdev_state_get_crop(state, pad, 0)
1374struct v4l2_rect *
1375__v4l2_subdev_state_get_crop(struct v4l2_subdev_state *state, unsigned int pad,
1376 u32 stream);
1377
1378/**
1379 * v4l2_subdev_state_get_compose() - Get pointer to a stream compose rectangle
1380 * @state: subdevice state
1381 * @pad: pad id
1382 * @...: stream id (optional argument)
1383 *
1384 * This returns a pointer to compose rectangle for the given pad + stream in the
1385 * subdev state.
1386 *
1387 * For stream-unaware drivers the compose rectangle for the corresponding pad is
1388 * returned. If the pad does not exist, NULL is returned.
1389 */
1390#define v4l2_subdev_state_get_compose(state, pad, ...) \
1391 __v4l2_subdev_state_gen_call(compose, ##__VA_ARGS__, , _pad) \
1392 (state, pad, ##__VA_ARGS__)
1393#define __v4l2_subdev_state_get_compose_pad(state, pad) \
1394 __v4l2_subdev_state_get_compose(state, pad, 0)
1395struct v4l2_rect *
1396__v4l2_subdev_state_get_compose(struct v4l2_subdev_state *state,
1397 unsigned int pad, u32 stream);
1398
1399/**
1400 * v4l2_subdev_state_get_interval() - Get pointer to a stream frame interval
1401 * @state: subdevice state
1402 * @pad: pad id
1403 * @...: stream id (optional argument)
1404 *
1405 * This returns a pointer to the frame interval for the given pad + stream in
1406 * the subdev state.
1407 *
1408 * For stream-unaware drivers the frame interval for the corresponding pad is
1409 * returned. If the pad does not exist, NULL is returned.
1410 */
1411#define v4l2_subdev_state_get_interval(state, pad, ...) \
1412 __v4l2_subdev_state_gen_call(interval, ##__VA_ARGS__, , _pad) \
1413 (state, pad, ##__VA_ARGS__)
1414#define __v4l2_subdev_state_get_interval_pad(state, pad) \
1415 __v4l2_subdev_state_get_interval(state, pad, 0)
1416struct v4l2_fract *
1417__v4l2_subdev_state_get_interval(struct v4l2_subdev_state *state,
1418 unsigned int pad, u32 stream);
1419
1420#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
1421
1422/**
1423 * v4l2_subdev_get_fmt() - Fill format based on state
1424 * @sd: subdevice
1425 * @state: subdevice state
1426 * @format: pointer to &struct v4l2_subdev_format
1427 *
1428 * Fill @format->format field based on the information in the @format struct.
1429 *
1430 * This function can be used by the subdev drivers which support active state to
1431 * implement v4l2_subdev_pad_ops.get_fmt if the subdev driver does not need to
1432 * do anything special in their get_fmt op.
1433 *
1434 * Returns 0 on success, error value otherwise.
1435 */
1436int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
1437 struct v4l2_subdev_format *format);
1438
1439/**
1440 * v4l2_subdev_get_frame_interval() - Fill frame interval based on state
1441 * @sd: subdevice
1442 * @state: subdevice state
1443 * @fi: pointer to &struct v4l2_subdev_frame_interval
1444 *
1445 * Fill @fi->interval field based on the information in the @fi struct.
1446 *
1447 * This function can be used by the subdev drivers which support active state to
1448 * implement v4l2_subdev_pad_ops.get_frame_interval if the subdev driver does
1449 * not need to do anything special in their get_frame_interval op.
1450 *
1451 * Returns 0 on success, error value otherwise.
1452 */
1453int v4l2_subdev_get_frame_interval(struct v4l2_subdev *sd,
1454 struct v4l2_subdev_state *state,
1455 struct v4l2_subdev_frame_interval *fi);
1456
1457/**
1458 * v4l2_subdev_set_routing() - Set given routing to subdev state
1459 * @sd: The subdevice
1460 * @state: The subdevice state
1461 * @routing: Routing that will be copied to subdev state
1462 *
1463 * This will release old routing table (if any) from the state, allocate
1464 * enough space for the given routing, and copy the routing.
1465 *
1466 * This can be used from the subdev driver's set_routing op, after validating
1467 * the routing.
1468 */
1469int v4l2_subdev_set_routing(struct v4l2_subdev *sd,
1470 struct v4l2_subdev_state *state,
1471 const struct v4l2_subdev_krouting *routing);
1472
1473struct v4l2_subdev_route *
1474__v4l2_subdev_next_active_route(const struct v4l2_subdev_krouting *routing,
1475 struct v4l2_subdev_route *route);
1476
1477/**
1478 * for_each_active_route - iterate on all active routes of a routing table
1479 * @routing: The routing table
1480 * @route: The route iterator
1481 */
1482#define for_each_active_route(routing, route) \
1483 for ((route) = NULL; \
1484 ((route) = __v4l2_subdev_next_active_route((routing), (route)));)
1485
1486/**
1487 * v4l2_subdev_set_routing_with_fmt() - Set given routing and format to subdev
1488 * state
1489 * @sd: The subdevice
1490 * @state: The subdevice state
1491 * @routing: Routing that will be copied to subdev state
1492 * @fmt: Format used to initialize all the streams
1493 *
1494 * This is the same as v4l2_subdev_set_routing, but additionally initializes
1495 * all the streams using the given format.
1496 */
1497int v4l2_subdev_set_routing_with_fmt(struct v4l2_subdev *sd,
1498 struct v4l2_subdev_state *state,
1499 const struct v4l2_subdev_krouting *routing,
1500 const struct v4l2_mbus_framefmt *fmt);
1501
1502/**
1503 * v4l2_subdev_routing_find_opposite_end() - Find the opposite stream
1504 * @routing: routing used to find the opposite side
1505 * @pad: pad id
1506 * @stream: stream id
1507 * @other_pad: pointer used to return the opposite pad
1508 * @other_stream: pointer used to return the opposite stream
1509 *
1510 * This function uses the routing table to find the pad + stream which is
1511 * opposite the given pad + stream.
1512 *
1513 * @other_pad and/or @other_stream can be NULL if the caller does not need the
1514 * value.
1515 *
1516 * Returns 0 on success, or -EINVAL if no matching route is found.
1517 */
1518int v4l2_subdev_routing_find_opposite_end(const struct v4l2_subdev_krouting *routing,
1519 u32 pad, u32 stream, u32 *other_pad,
1520 u32 *other_stream);
1521
1522/**
1523 * v4l2_subdev_state_get_opposite_stream_format() - Get pointer to opposite
1524 * stream format
1525 * @state: subdevice state
1526 * @pad: pad id
1527 * @stream: stream id
1528 *
1529 * This returns a pointer to &struct v4l2_mbus_framefmt for the pad + stream
1530 * that is opposite the given pad + stream in the subdev state.
1531 *
1532 * If the state does not contain the given pad + stream, NULL is returned.
1533 */
1534struct v4l2_mbus_framefmt *
1535v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
1536 u32 pad, u32 stream);
1537
1538/**
1539 * v4l2_subdev_state_xlate_streams() - Translate streams from one pad to another
1540 *
1541 * @state: Subdevice state
1542 * @pad0: The first pad
1543 * @pad1: The second pad
1544 * @streams: Streams bitmask on the first pad
1545 *
1546 * Streams on sink pads of a subdev are routed to source pads as expressed in
1547 * the subdev state routing table. Stream numbers don't necessarily match on
1548 * the sink and source side of a route. This function translates stream numbers
1549 * on @pad0, expressed as a bitmask in @streams, to the corresponding streams
1550 * on @pad1 using the routing table from the @state. It returns the stream mask
1551 * on @pad1, and updates @streams with the streams that have been found in the
1552 * routing table.
1553 *
1554 * @pad0 and @pad1 must be a sink and a source, in any order.
1555 *
1556 * Return: The bitmask of streams of @pad1 that are routed to @streams on @pad0.
1557 */
1558u64 v4l2_subdev_state_xlate_streams(const struct v4l2_subdev_state *state,
1559 u32 pad0, u32 pad1, u64 *streams);
1560
1561/**
1562 * enum v4l2_subdev_routing_restriction - Subdevice internal routing restrictions
1563 *
1564 * @V4L2_SUBDEV_ROUTING_NO_1_TO_N:
1565 * an input stream shall not be routed to multiple output streams (stream
1566 * duplication)
1567 * @V4L2_SUBDEV_ROUTING_NO_N_TO_1:
1568 * multiple input streams shall not be routed to the same output stream
1569 * (stream merging)
1570 * @V4L2_SUBDEV_ROUTING_NO_SINK_STREAM_MIX:
1571 * all streams from a sink pad must be routed to a single source pad
1572 * @V4L2_SUBDEV_ROUTING_NO_SOURCE_STREAM_MIX:
1573 * all streams on a source pad must originate from a single sink pad
1574 * @V4L2_SUBDEV_ROUTING_NO_SOURCE_MULTIPLEXING:
1575 * source pads shall not contain multiplexed streams
1576 * @V4L2_SUBDEV_ROUTING_NO_SINK_MULTIPLEXING:
1577 * sink pads shall not contain multiplexed streams
1578 * @V4L2_SUBDEV_ROUTING_ONLY_1_TO_1:
1579 * only non-overlapping 1-to-1 stream routing is allowed (a combination of
1580 * @V4L2_SUBDEV_ROUTING_NO_1_TO_N and @V4L2_SUBDEV_ROUTING_NO_N_TO_1)
1581 * @V4L2_SUBDEV_ROUTING_NO_STREAM_MIX:
1582 * all streams from a sink pad must be routed to a single source pad, and
1583 * that source pad shall not get routes from any other sink pad
1584 * (a combination of @V4L2_SUBDEV_ROUTING_NO_SINK_STREAM_MIX and
1585 * @V4L2_SUBDEV_ROUTING_NO_SOURCE_STREAM_MIX)
1586 * @V4L2_SUBDEV_ROUTING_NO_MULTIPLEXING:
1587 * no multiplexed streams allowed on either source or sink sides.
1588 */
1589enum v4l2_subdev_routing_restriction {
1590 V4L2_SUBDEV_ROUTING_NO_1_TO_N = BIT(0),
1591 V4L2_SUBDEV_ROUTING_NO_N_TO_1 = BIT(1),
1592 V4L2_SUBDEV_ROUTING_NO_SINK_STREAM_MIX = BIT(2),
1593 V4L2_SUBDEV_ROUTING_NO_SOURCE_STREAM_MIX = BIT(3),
1594 V4L2_SUBDEV_ROUTING_NO_SINK_MULTIPLEXING = BIT(4),
1595 V4L2_SUBDEV_ROUTING_NO_SOURCE_MULTIPLEXING = BIT(5),
1596 V4L2_SUBDEV_ROUTING_ONLY_1_TO_1 =
1597 V4L2_SUBDEV_ROUTING_NO_1_TO_N |
1598 V4L2_SUBDEV_ROUTING_NO_N_TO_1,
1599 V4L2_SUBDEV_ROUTING_NO_STREAM_MIX =
1600 V4L2_SUBDEV_ROUTING_NO_SINK_STREAM_MIX |
1601 V4L2_SUBDEV_ROUTING_NO_SOURCE_STREAM_MIX,
1602 V4L2_SUBDEV_ROUTING_NO_MULTIPLEXING =
1603 V4L2_SUBDEV_ROUTING_NO_SINK_MULTIPLEXING |
1604 V4L2_SUBDEV_ROUTING_NO_SOURCE_MULTIPLEXING,
1605};
1606
1607/**
1608 * v4l2_subdev_routing_validate() - Verify that routes comply with driver
1609 * constraints
1610 * @sd: The subdevice
1611 * @routing: Routing to verify
1612 * @disallow: Restrictions on routes
1613 *
1614 * This verifies that the given routing complies with the @disallow constraints.
1615 *
1616 * Returns 0 on success, error value otherwise.
1617 */
1618int v4l2_subdev_routing_validate(struct v4l2_subdev *sd,
1619 const struct v4l2_subdev_krouting *routing,
1620 enum v4l2_subdev_routing_restriction disallow);
1621
1622/**
1623 * v4l2_subdev_enable_streams() - Enable streams on a pad
1624 * @sd: The subdevice
1625 * @pad: The pad
1626 * @streams_mask: Bitmask of streams to enable
1627 *
1628 * This function enables streams on a source @pad of a subdevice. The pad is
1629 * identified by its index, while the streams are identified by the
1630 * @streams_mask bitmask. This allows enabling multiple streams on a pad at
1631 * once.
1632 *
1633 * Enabling a stream that is already enabled isn't allowed. If @streams_mask
1634 * contains an already enabled stream, this function returns -EALREADY without
1635 * performing any operation.
1636 *
1637 * Per-stream enable is only available for subdevs that implement the
1638 * .enable_streams() and .disable_streams() operations. For other subdevs, this
1639 * function implements a best-effort compatibility by calling the .s_stream()
1640 * operation, limited to subdevs that have a single source pad.
1641 *
1642 * Return:
1643 * * 0: Success
1644 * * -EALREADY: One of the streams in streams_mask is already enabled
1645 * * -EINVAL: The pad index is invalid, or doesn't correspond to a source pad
1646 * * -EOPNOTSUPP: Falling back to the legacy .s_stream() operation is
1647 * impossible because the subdev has multiple source pads
1648 */
1649int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
1650 u64 streams_mask);
1651
1652/**
1653 * v4l2_subdev_disable_streams() - Disable streams on a pad
1654 * @sd: The subdevice
1655 * @pad: The pad
1656 * @streams_mask: Bitmask of streams to disable
1657 *
1658 * This function disables streams on a source @pad of a subdevice. The pad is
1659 * identified by its index, while the streams are identified by the
1660 * @streams_mask bitmask. This allows disabling multiple streams on a pad at
1661 * once.
1662 *
1663 * Disabling a streams that is not enabled isn't allowed. If @streams_mask
1664 * contains a disabled stream, this function returns -EALREADY without
1665 * performing any operation.
1666 *
1667 * Per-stream disable is only available for subdevs that implement the
1668 * .enable_streams() and .disable_streams() operations. For other subdevs, this
1669 * function implements a best-effort compatibility by calling the .s_stream()
1670 * operation, limited to subdevs that have a single source pad.
1671 *
1672 * Return:
1673 * * 0: Success
1674 * * -EALREADY: One of the streams in streams_mask is not enabled
1675 * * -EINVAL: The pad index is invalid, or doesn't correspond to a source pad
1676 * * -EOPNOTSUPP: Falling back to the legacy .s_stream() operation is
1677 * impossible because the subdev has multiple source pads
1678 */
1679int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
1680 u64 streams_mask);
1681
1682/**
1683 * v4l2_subdev_s_stream_helper() - Helper to implement the subdev s_stream
1684 * operation using enable_streams and disable_streams
1685 * @sd: The subdevice
1686 * @enable: Enable or disable streaming
1687 *
1688 * Subdevice drivers that implement the streams-aware
1689 * &v4l2_subdev_pad_ops.enable_streams and &v4l2_subdev_pad_ops.disable_streams
1690 * operations can use this helper to implement the legacy
1691 * &v4l2_subdev_video_ops.s_stream operation.
1692 *
1693 * This helper can only be used by subdevs that have a single source pad.
1694 *
1695 * Return: 0 on success, or a negative error code otherwise.
1696 */
1697int v4l2_subdev_s_stream_helper(struct v4l2_subdev *sd, int enable);
1698
1699#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
1700
1701#endif /* CONFIG_MEDIA_CONTROLLER */
1702
1703/**
1704 * v4l2_subdev_lock_state() - Locks the subdev state
1705 * @state: The subdevice state
1706 *
1707 * Locks the given subdev state.
1708 *
1709 * The state must be unlocked with v4l2_subdev_unlock_state() after use.
1710 */
1711static inline void v4l2_subdev_lock_state(struct v4l2_subdev_state *state)
1712{
1713 mutex_lock(state->lock);
1714}
1715
1716/**
1717 * v4l2_subdev_unlock_state() - Unlocks the subdev state
1718 * @state: The subdevice state
1719 *
1720 * Unlocks the given subdev state.
1721 */
1722static inline void v4l2_subdev_unlock_state(struct v4l2_subdev_state *state)
1723{
1724 mutex_unlock(state->lock);
1725}
1726
1727/**
1728 * v4l2_subdev_get_unlocked_active_state() - Checks that the active subdev state
1729 * is unlocked and returns it
1730 * @sd: The subdevice
1731 *
1732 * Returns the active state for the subdevice, or NULL if the subdev does not
1733 * support active state. If the state is not NULL, calls
1734 * lockdep_assert_not_held() to issue a warning if the state is locked.
1735 *
1736 * This function is to be used e.g. when getting the active state for the sole
1737 * purpose of passing it forward, without accessing the state fields.
1738 */
1739static inline struct v4l2_subdev_state *
1740v4l2_subdev_get_unlocked_active_state(struct v4l2_subdev *sd)
1741{
1742 if (sd->active_state)
1743 lockdep_assert_not_held(sd->active_state->lock);
1744 return sd->active_state;
1745}
1746
1747/**
1748 * v4l2_subdev_get_locked_active_state() - Checks that the active subdev state
1749 * is locked and returns it
1750 *
1751 * @sd: The subdevice
1752 *
1753 * Returns the active state for the subdevice, or NULL if the subdev does not
1754 * support active state. If the state is not NULL, calls lockdep_assert_held()
1755 * to issue a warning if the state is not locked.
1756 *
1757 * This function is to be used when the caller knows that the active state is
1758 * already locked.
1759 */
1760static inline struct v4l2_subdev_state *
1761v4l2_subdev_get_locked_active_state(struct v4l2_subdev *sd)
1762{
1763 if (sd->active_state)
1764 lockdep_assert_held(sd->active_state->lock);
1765 return sd->active_state;
1766}
1767
1768/**
1769 * v4l2_subdev_lock_and_get_active_state() - Locks and returns the active subdev
1770 * state for the subdevice
1771 * @sd: The subdevice
1772 *
1773 * Returns the locked active state for the subdevice, or NULL if the subdev
1774 * does not support active state.
1775 *
1776 * The state must be unlocked with v4l2_subdev_unlock_state() after use.
1777 */
1778static inline struct v4l2_subdev_state *
1779v4l2_subdev_lock_and_get_active_state(struct v4l2_subdev *sd)
1780{
1781 if (sd->active_state)
1782 v4l2_subdev_lock_state(sd->active_state);
1783 return sd->active_state;
1784}
1785
1786/**
1787 * v4l2_subdev_init - initializes the sub-device struct
1788 *
1789 * @sd: pointer to the &struct v4l2_subdev to be initialized
1790 * @ops: pointer to &struct v4l2_subdev_ops.
1791 */
1792void v4l2_subdev_init(struct v4l2_subdev *sd,
1793 const struct v4l2_subdev_ops *ops);
1794
1795extern const struct v4l2_subdev_ops v4l2_subdev_call_wrappers;
1796
1797/**
1798 * v4l2_subdev_call - call an operation of a v4l2_subdev.
1799 *
1800 * @sd: pointer to the &struct v4l2_subdev
1801 * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
1802 * Each element there groups a set of callbacks functions.
1803 * @f: callback function to be called.
1804 * The callback functions are defined in groups, according to
1805 * each element at &struct v4l2_subdev_ops.
1806 * @args: arguments for @f.
1807 *
1808 * Example: err = v4l2_subdev_call(sd, video, s_std, norm);
1809 */
1810#define v4l2_subdev_call(sd, o, f, args...) \
1811 ({ \
1812 struct v4l2_subdev *__sd = (sd); \
1813 int __result; \
1814 if (!__sd) \
1815 __result = -ENODEV; \
1816 else if (!(__sd->ops->o && __sd->ops->o->f)) \
1817 __result = -ENOIOCTLCMD; \
1818 else if (v4l2_subdev_call_wrappers.o && \
1819 v4l2_subdev_call_wrappers.o->f) \
1820 __result = v4l2_subdev_call_wrappers.o->f( \
1821 __sd, ##args); \
1822 else \
1823 __result = __sd->ops->o->f(__sd, ##args); \
1824 __result; \
1825 })
1826
1827/**
1828 * v4l2_subdev_call_state_active - call an operation of a v4l2_subdev which
1829 * takes state as a parameter, passing the
1830 * subdev its active state.
1831 *
1832 * @sd: pointer to the &struct v4l2_subdev
1833 * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
1834 * Each element there groups a set of callbacks functions.
1835 * @f: callback function to be called.
1836 * The callback functions are defined in groups, according to
1837 * each element at &struct v4l2_subdev_ops.
1838 * @args: arguments for @f.
1839 *
1840 * This is similar to v4l2_subdev_call(), except that this version can only be
1841 * used for ops that take a subdev state as a parameter. The macro will get the
1842 * active state, lock it before calling the op and unlock it after the call.
1843 */
1844#define v4l2_subdev_call_state_active(sd, o, f, args...) \
1845 ({ \
1846 int __result; \
1847 struct v4l2_subdev_state *state; \
1848 state = v4l2_subdev_get_unlocked_active_state(sd); \
1849 if (state) \
1850 v4l2_subdev_lock_state(state); \
1851 __result = v4l2_subdev_call(sd, o, f, state, ##args); \
1852 if (state) \
1853 v4l2_subdev_unlock_state(state); \
1854 __result; \
1855 })
1856
1857/**
1858 * v4l2_subdev_call_state_try - call an operation of a v4l2_subdev which
1859 * takes state as a parameter, passing the
1860 * subdev a newly allocated try state.
1861 *
1862 * @sd: pointer to the &struct v4l2_subdev
1863 * @o: name of the element at &struct v4l2_subdev_ops that contains @f.
1864 * Each element there groups a set of callbacks functions.
1865 * @f: callback function to be called.
1866 * The callback functions are defined in groups, according to
1867 * each element at &struct v4l2_subdev_ops.
1868 * @args: arguments for @f.
1869 *
1870 * This is similar to v4l2_subdev_call_state_active(), except that as this
1871 * version allocates a new state, this is only usable for
1872 * V4L2_SUBDEV_FORMAT_TRY use cases.
1873 *
1874 * Note: only legacy non-MC drivers may need this macro.
1875 */
1876#define v4l2_subdev_call_state_try(sd, o, f, args...) \
1877 ({ \
1878 int __result; \
1879 static struct lock_class_key __key; \
1880 const char *name = KBUILD_BASENAME \
1881 ":" __stringify(__LINE__) ":state->lock"; \
1882 struct v4l2_subdev_state *state = \
1883 __v4l2_subdev_state_alloc(sd, name, &__key); \
1884 v4l2_subdev_lock_state(state); \
1885 __result = v4l2_subdev_call(sd, o, f, state, ##args); \
1886 v4l2_subdev_unlock_state(state); \
1887 __v4l2_subdev_state_free(state); \
1888 __result; \
1889 })
1890
1891/**
1892 * v4l2_subdev_has_op - Checks if a subdev defines a certain operation.
1893 *
1894 * @sd: pointer to the &struct v4l2_subdev
1895 * @o: The group of callback functions in &struct v4l2_subdev_ops
1896 * which @f is a part of.
1897 * @f: callback function to be checked for its existence.
1898 */
1899#define v4l2_subdev_has_op(sd, o, f) \
1900 ((sd)->ops->o && (sd)->ops->o->f)
1901
1902/**
1903 * v4l2_subdev_notify_event() - Delivers event notification for subdevice
1904 * @sd: The subdev for which to deliver the event
1905 * @ev: The event to deliver
1906 *
1907 * Will deliver the specified event to all userspace event listeners which are
1908 * subscribed to the v42l subdev event queue as well as to the bridge driver
1909 * using the notify callback. The notification type for the notify callback
1910 * will be %V4L2_DEVICE_NOTIFY_EVENT.
1911 */
1912void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
1913 const struct v4l2_event *ev);
1914
1915#endif /* _V4L2_SUBDEV_H */