2 V4L2 sub-device support header.
4 Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
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.
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.
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
21 #ifndef _V4L2_SUBDEV_H
22 #define _V4L2_SUBDEV_H
24 #include <linux/v4l2-subdev.h>
25 #include <media/media-entity.h>
26 #include <media/v4l2-common.h>
27 #include <media/v4l2-dev.h>
28 #include <media/v4l2-fh.h>
29 #include <media/v4l2-mediabus.h>
31 /* generic v4l2_device notify callback notification values */
32 #define V4L2_SUBDEV_IR_RX_NOTIFY _IOW('v', 0, u32)
33 #define V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ 0x00000001
34 #define V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED 0x00000002
35 #define V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN 0x00000004
36 #define V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN 0x00000008
38 #define V4L2_SUBDEV_IR_TX_NOTIFY _IOW('v', 1, u32)
39 #define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ 0x00000001
42 struct v4l2_ctrl_handler;
43 struct v4l2_event_subscription;
46 struct v4l2_subdev_fh;
50 struct v4l2_decode_vbi_line {
51 u32 is_second_field; /* Set to 0 for the first (odd) field,
52 set to 1 for the second (even) field. */
53 u8 *p; /* Pointer to the sliced VBI data from the decoder.
54 On exit points to the start of the payload. */
55 u32 line; /* Line number of the sliced VBI data (1-23) */
56 u32 type; /* VBI service type (V4L2_SLICED_*). 0 if no service found */
59 /* Sub-devices are devices that are connected somehow to the main bridge
60 device. These devices are usually audio/video muxers/encoders/decoders or
61 sensors and webcam controllers.
63 Usually these devices are controlled through an i2c bus, but other busses
66 The v4l2_subdev struct provides a way of accessing these devices in a
67 generic manner. Most operations that these sub-devices support fall in
68 a few categories: core ops, audio ops, video ops and tuner ops.
70 More categories can be added if needed, although this should remain a
71 limited set (no more than approx. 8 categories).
73 Each category has its own set of ops that subdev drivers can implement.
75 A subdev driver can leave the pointer to the category ops NULL if
76 it does not implement them (e.g. an audio subdev will generally not
77 implement the video category ops). The exception is the core category:
78 this must always be present.
80 These ops are all used internally so it is no problem to change, remove
81 or add ops or move ops from one to another category. Currently these
82 ops are based on the original ioctls, but since ops are not limited to
83 one argument there is room for improvement here once all i2c subdev
84 drivers are converted to use these ops.
87 /* Core ops: it is highly recommended to implement at least these ops:
94 This provides basic debugging support.
96 The ioctl ops is meant for generic ioctl-like commands. Depending on
97 the use-case it might be better to use subdev-specific ops (currently
98 not yet implemented) since ops provide proper type-checking.
101 /* Subdevice external IO pin configuration */
102 #define V4L2_SUBDEV_IO_PIN_DISABLE (1 << 0) /* ENABLE assumed */
103 #define V4L2_SUBDEV_IO_PIN_OUTPUT (1 << 1)
104 #define V4L2_SUBDEV_IO_PIN_INPUT (1 << 2)
105 #define V4L2_SUBDEV_IO_PIN_SET_VALUE (1 << 3) /* Set output value */
106 #define V4L2_SUBDEV_IO_PIN_ACTIVE_LOW (1 << 4) /* ACTIVE HIGH assumed */
108 struct v4l2_subdev_io_pin_config {
109 u32 flags; /* V4L2_SUBDEV_IO_PIN_* flags for this pin's config */
110 u8 pin; /* Chip external IO pin to configure */
111 u8 function; /* Internal signal pad/function to route to IO pin */
112 u8 value; /* Initial value for pin - e.g. GPIO output value */
113 u8 strength; /* Pin drive strength */
117 s_io_pin_config: configure one or more chip I/O pins for chips that
118 multiplex different internal signal pads out to IO pins. This function
119 takes a pointer to an array of 'n' pin configuration entries, one for
120 each pin being configured. This function could be called at times
121 other than just subdevice initialization.
123 init: initialize the sensor registors to some sort of reasonable default
124 values. Do not use for new drivers and should be removed in existing
127 load_fw: load firmware.
129 reset: generic reset command. The argument selects which subsystems to
130 reset. Passing 0 will always reset the whole chip. Do not use for new
131 drivers without discussing this first on the linux-media mailinglist.
132 There should be no reason normally to reset a device.
134 s_gpio: set GPIO pins. Very simple right now, might need to be extended with
135 a direction argument if needed.
137 s_power: puts subdevice in power saving mode (on == 0) or normal operation
140 interrupt_service_routine: Called by the bridge chip's interrupt service
141 handler, when an interrupt status has be raised due to this subdev,
142 so that this subdev can handle the details. It may schedule work to be
143 performed later. It must not sleep. *Called from an IRQ context*.
145 struct v4l2_subdev_core_ops {
146 int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip);
147 int (*log_status)(struct v4l2_subdev *sd);
148 int (*s_io_pin_config)(struct v4l2_subdev *sd, size_t n,
149 struct v4l2_subdev_io_pin_config *pincfg);
150 int (*init)(struct v4l2_subdev *sd, u32 val);
151 int (*load_fw)(struct v4l2_subdev *sd);
152 int (*reset)(struct v4l2_subdev *sd, u32 val);
153 int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
154 int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
155 int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
156 int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
157 int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
158 int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
159 int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
160 int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
161 int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
162 long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
163 #ifdef CONFIG_VIDEO_ADV_DEBUG
164 int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
165 int (*s_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
167 int (*s_power)(struct v4l2_subdev *sd, int on);
168 int (*interrupt_service_routine)(struct v4l2_subdev *sd,
169 u32 status, bool *handled);
170 int (*subscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
171 struct v4l2_event_subscription *sub);
172 int (*unsubscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
173 struct v4l2_event_subscription *sub);
176 /* s_radio: v4l device was opened in radio mode.
178 s_type_addr: sets tuner type and its I2C addr.
180 s_config: sets tda9887 specific stuff, like port1, port2 and qss
182 struct v4l2_subdev_tuner_ops {
183 int (*s_radio)(struct v4l2_subdev *sd);
184 int (*s_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
185 int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
186 int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
187 int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
188 int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
189 int (*s_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
190 int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
191 int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
194 /* s_clock_freq: set the frequency (in Hz) of the audio clock output.
195 Used to slave an audio processor to the video decoder, ensuring that
196 audio and video remain synchronized. Usual values for the frequency
197 are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
200 s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
201 way to select I2S clock used by driving digital audio streams at some
202 board designs. Usual values for the frequency are 1024000 and 2048000.
203 If the frequency is not supported, then -EINVAL is returned.
205 s_routing: used to define the input and/or output pins of an audio chip,
206 and any additional configuration data.
207 Never attempt to use user-level input IDs (e.g. Composite, S-Video,
208 Tuner) at this level. An i2c device shouldn't know about whether an
209 input pin is connected to a Composite connector, become on another
210 board or platform it might be connected to something else entirely.
211 The calling driver is responsible for mapping a user-level input to
212 the right pins on the i2c device.
214 struct v4l2_subdev_audio_ops {
215 int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
216 int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
217 int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
218 int (*s_stream)(struct v4l2_subdev *sd, int enable);
222 s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
225 s_crystal_freq: sets the frequency of the crystal used to generate the
226 clocks in Hz. An extra flags field allows device specific configuration
227 regarding clock frequency dividers, etc. If not used, then set flags
228 to 0. If the frequency is not supported, then -EINVAL is returned.
230 g_input_status: get input status. Same as the status field in the v4l2_input
233 s_routing: see s_routing in audio_ops, except this version is for video
236 s_dv_preset: set dv (Digital Video) preset in the sub device. Similar to
239 query_dv_preset: query dv preset in the sub device. This is similar to
242 s_dv_timings(): Set custom dv timings in the sub device. This is used
243 when sub device is capable of setting detailed timing information
244 in the hardware to generate/detect the video signal.
246 g_dv_timings(): Get custom dv timings in the sub device.
248 enum_mbus_fmt: enumerate pixel formats, provided by a video data source
250 g_mbus_fmt: get the current pixel format, provided by a video data source
252 try_mbus_fmt: try to set a pixel format on a video data source
254 s_mbus_fmt: set a pixel format on a video data source
256 struct v4l2_subdev_video_ops {
257 int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
258 int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
259 int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
260 int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
261 int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
262 int (*s_stream)(struct v4l2_subdev *sd, int enable);
263 int (*cropcap)(struct v4l2_subdev *sd, struct v4l2_cropcap *cc);
264 int (*g_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
265 int (*s_crop)(struct v4l2_subdev *sd, struct v4l2_crop *crop);
266 int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
267 int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
268 int (*g_frame_interval)(struct v4l2_subdev *sd,
269 struct v4l2_subdev_frame_interval *interval);
270 int (*s_frame_interval)(struct v4l2_subdev *sd,
271 struct v4l2_subdev_frame_interval *interval);
272 int (*enum_framesizes)(struct v4l2_subdev *sd, struct v4l2_frmsizeenum *fsize);
273 int (*enum_frameintervals)(struct v4l2_subdev *sd, struct v4l2_frmivalenum *fival);
274 int (*enum_dv_presets) (struct v4l2_subdev *sd,
275 struct v4l2_dv_enum_preset *preset);
276 int (*s_dv_preset)(struct v4l2_subdev *sd,
277 struct v4l2_dv_preset *preset);
278 int (*query_dv_preset)(struct v4l2_subdev *sd,
279 struct v4l2_dv_preset *preset);
280 int (*s_dv_timings)(struct v4l2_subdev *sd,
281 struct v4l2_dv_timings *timings);
282 int (*g_dv_timings)(struct v4l2_subdev *sd,
283 struct v4l2_dv_timings *timings);
284 int (*enum_mbus_fmt)(struct v4l2_subdev *sd, unsigned int index,
285 enum v4l2_mbus_pixelcode *code);
286 int (*enum_mbus_fsizes)(struct v4l2_subdev *sd,
287 struct v4l2_frmsizeenum *fsize);
288 int (*g_mbus_fmt)(struct v4l2_subdev *sd,
289 struct v4l2_mbus_framefmt *fmt);
290 int (*try_mbus_fmt)(struct v4l2_subdev *sd,
291 struct v4l2_mbus_framefmt *fmt);
292 int (*s_mbus_fmt)(struct v4l2_subdev *sd,
293 struct v4l2_mbus_framefmt *fmt);
297 decode_vbi_line: video decoders that support sliced VBI need to implement
298 this ioctl. Field p of the v4l2_sliced_vbi_line struct is set to the
299 start of the VBI data that was generated by the decoder. The driver
300 then parses the sliced VBI data and sets the other fields in the
301 struct accordingly. The pointer p is updated to point to the start of
302 the payload which can be copied verbatim into the data field of the
303 v4l2_sliced_vbi_data struct. If no valid VBI data was found, then the
304 type field is set to 0 on return.
306 s_vbi_data: used to generate VBI signals on a video signal.
307 v4l2_sliced_vbi_data is filled with the data packets that should be
308 output. Note that if you set the line field to 0, then that VBI signal
309 is disabled. If no valid VBI data was found, then the type field is
312 g_vbi_data: used to obtain the sliced VBI packet from a readback register.
313 Not all video decoders support this. If no data is available because
314 the readback register contains invalid or erroneous data -EIO is
315 returned. Note that you must fill in the 'id' member and the 'field'
316 member (to determine whether CC data from the first or second field
319 s_raw_fmt: setup the video encoder/decoder for raw VBI.
321 g_sliced_fmt: retrieve the current sliced VBI settings.
323 s_sliced_fmt: setup the sliced VBI settings.
325 struct v4l2_subdev_vbi_ops {
326 int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
327 int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
328 int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
329 int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
330 int (*s_raw_fmt)(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt);
331 int (*g_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
332 int (*s_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
336 * struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
337 * @g_skip_top_lines: number of lines at the top of the image to be skipped.
338 * This is needed for some sensors, which always corrupt
339 * several top lines of the output image, or which send their
341 * @g_skip_frames: number of frames to skip at stream start. This is needed for
342 * buggy sensors that generate faulty frames when they are
345 struct v4l2_subdev_sensor_ops {
346 int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
347 int (*g_skip_frames)(struct v4l2_subdev *sd, u32 *frames);
351 [rt]x_g_parameters: Get the current operating parameters and state of the
352 the IR receiver or transmitter.
354 [rt]x_s_parameters: Set the current operating parameters and state of the
355 the IR receiver or transmitter. It is recommended to call
356 [rt]x_g_parameters first to fill out the current state, and only change
357 the fields that need to be changed. Upon return, the actual device
358 operating parameters and state will be returned. Note that hardware
359 limitations may prevent the actual settings from matching the requested
360 settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
361 was requested. An exception is when the shutdown parameter is true.
362 The last used operational parameters will be returned, but the actual
363 state of the hardware be different to minimize power consumption and
364 processing when shutdown is true.
366 rx_read: Reads received codes or pulse width data.
367 The semantics are similar to a non-blocking read() call.
369 tx_write: Writes codes or pulse width data for transmission.
370 The semantics are similar to a non-blocking write() call.
373 enum v4l2_subdev_ir_mode {
374 V4L2_SUBDEV_IR_MODE_PULSE_WIDTH, /* uses struct ir_raw_event records */
377 struct v4l2_subdev_ir_parameters {
378 /* Either Rx or Tx */
379 unsigned int bytes_per_data_element; /* of data in read or write call */
380 enum v4l2_subdev_ir_mode mode;
383 bool interrupt_enable;
384 bool shutdown; /* true: set hardware to low/no power, false: normal */
386 bool modulation; /* true: uses carrier, false: baseband */
387 u32 max_pulse_width; /* ns, valid only for baseband signal */
388 unsigned int carrier_freq; /* Hz, valid only for modulated signal*/
389 unsigned int duty_cycle; /* percent, valid only for modulated signal*/
390 bool invert_level; /* invert signal level */
393 bool invert_carrier_sense; /* Send 0/space as a carrier burst */
396 u32 noise_filter_min_width; /* ns, min time of a valid pulse */
397 unsigned int carrier_range_lower; /* Hz, valid only for modulated sig */
398 unsigned int carrier_range_upper; /* Hz, valid only for modulated sig */
399 u32 resolution; /* ns */
402 struct v4l2_subdev_ir_ops {
404 int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
407 int (*rx_g_parameters)(struct v4l2_subdev *sd,
408 struct v4l2_subdev_ir_parameters *params);
409 int (*rx_s_parameters)(struct v4l2_subdev *sd,
410 struct v4l2_subdev_ir_parameters *params);
413 int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
416 int (*tx_g_parameters)(struct v4l2_subdev *sd,
417 struct v4l2_subdev_ir_parameters *params);
418 int (*tx_s_parameters)(struct v4l2_subdev *sd,
419 struct v4l2_subdev_ir_parameters *params);
422 struct v4l2_subdev_pad_ops {
423 int (*enum_mbus_code)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
424 struct v4l2_subdev_mbus_code_enum *code);
425 int (*enum_frame_size)(struct v4l2_subdev *sd,
426 struct v4l2_subdev_fh *fh,
427 struct v4l2_subdev_frame_size_enum *fse);
428 int (*enum_frame_interval)(struct v4l2_subdev *sd,
429 struct v4l2_subdev_fh *fh,
430 struct v4l2_subdev_frame_interval_enum *fie);
431 int (*get_fmt)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
432 struct v4l2_subdev_format *format);
433 int (*set_fmt)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
434 struct v4l2_subdev_format *format);
435 int (*set_crop)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
436 struct v4l2_subdev_crop *crop);
437 int (*get_crop)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
438 struct v4l2_subdev_crop *crop);
441 struct v4l2_subdev_ops {
442 const struct v4l2_subdev_core_ops *core;
443 const struct v4l2_subdev_tuner_ops *tuner;
444 const struct v4l2_subdev_audio_ops *audio;
445 const struct v4l2_subdev_video_ops *video;
446 const struct v4l2_subdev_vbi_ops *vbi;
447 const struct v4l2_subdev_ir_ops *ir;
448 const struct v4l2_subdev_sensor_ops *sensor;
449 const struct v4l2_subdev_pad_ops *pad;
453 * Internal ops. Never call this from drivers, only the v4l2 framework can call
456 * registered: called when this subdev is registered. When called the v4l2_dev
457 * field is set to the correct v4l2_device.
459 * unregistered: called when this subdev is unregistered. When called the
460 * v4l2_dev field is still set to the correct v4l2_device.
462 * open: called when the subdev device node is opened by an application.
464 * close: called when the subdev device node is closed.
466 struct v4l2_subdev_internal_ops {
467 int (*registered)(struct v4l2_subdev *sd);
468 void (*unregistered)(struct v4l2_subdev *sd);
469 int (*open)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
470 int (*close)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
473 #define V4L2_SUBDEV_NAME_SIZE 32
475 /* Set this flag if this subdev is a i2c device. */
476 #define V4L2_SUBDEV_FL_IS_I2C (1U << 0)
477 /* Set this flag if this subdev is a spi device. */
478 #define V4L2_SUBDEV_FL_IS_SPI (1U << 1)
479 /* Set this flag if this subdev needs a device node. */
480 #define V4L2_SUBDEV_FL_HAS_DEVNODE (1U << 2)
481 /* Set this flag if this subdev generates events. */
482 #define V4L2_SUBDEV_FL_HAS_EVENTS (1U << 3)
484 /* Each instance of a subdev driver should create this struct, either
485 stand-alone or embedded in a larger struct.
488 #if defined(CONFIG_MEDIA_CONTROLLER)
489 struct media_entity entity;
491 struct list_head list;
492 struct module *owner;
494 struct v4l2_device *v4l2_dev;
495 const struct v4l2_subdev_ops *ops;
496 /* Never call these internal ops from within a driver! */
497 const struct v4l2_subdev_internal_ops *internal_ops;
498 /* The control handler of this subdev. May be NULL. */
499 struct v4l2_ctrl_handler *ctrl_handler;
500 /* name must be unique */
501 char name[V4L2_SUBDEV_NAME_SIZE];
502 /* can be used to group similar subdevs, value is driver-specific */
504 /* pointer to private data */
507 /* subdev device node */
508 struct video_device devnode;
509 /* number of events to be allocated on open */
510 unsigned int nevents;
513 #define media_entity_to_v4l2_subdev(ent) \
514 container_of(ent, struct v4l2_subdev, entity)
515 #define vdev_to_v4l2_subdev(vdev) \
516 container_of(vdev, struct v4l2_subdev, devnode)
519 * Used for storing subdev information per file handle
521 struct v4l2_subdev_fh {
523 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
524 struct v4l2_mbus_framefmt *try_fmt;
525 struct v4l2_rect *try_crop;
529 #define to_v4l2_subdev_fh(fh) \
530 container_of(fh, struct v4l2_subdev_fh, vfh)
532 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
533 static inline struct v4l2_mbus_framefmt *
534 v4l2_subdev_get_try_format(struct v4l2_subdev_fh *fh, unsigned int pad)
536 return &fh->try_fmt[pad];
539 static inline struct v4l2_rect *
540 v4l2_subdev_get_try_crop(struct v4l2_subdev_fh *fh, unsigned int pad)
542 return &fh->try_crop[pad];
546 extern const struct v4l2_file_operations v4l2_subdev_fops;
548 static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
553 static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
558 static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p)
563 static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
565 return sd->host_priv;
568 void v4l2_subdev_init(struct v4l2_subdev *sd,
569 const struct v4l2_subdev_ops *ops);
571 /* Call an ops of a v4l2_subdev, doing the right checks against
574 Example: err = v4l2_subdev_call(sd, core, g_chip_ident, &chip);
576 #define v4l2_subdev_call(sd, o, f, args...) \
577 (!(sd) ? -ENODEV : (((sd)->ops->o && (sd)->ops->o->f) ? \
578 (sd)->ops->o->f((sd) , ##args) : -ENOIOCTLCMD))
580 /* Send a notification to v4l2_device. */
581 #define v4l2_subdev_notify(sd, notification, arg) \
582 ((!(sd) || !(sd)->v4l2_dev || !(sd)->v4l2_dev->notify) ? -ENODEV : \
583 (sd)->v4l2_dev->notify((sd), (notification), (arg)))