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1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * V4L2 sub-device support header.
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>
44 * struct v4l2_decode_vbi_line - used to decode_vbi_line
50 * @line: Line number of the sliced VBI data (1-23)
61 * Sub-devices are devices that are connected somehow to the main bridge
69 * generic manner. Most operations that these sub-devices support fall in
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.
104 * enum v4l2_subdev_io_pin_bits - Subdevice external IO pin configuration
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.
110 * @V4L2_SUBDEV_IO_PIN_SET_VALUE: to set the output value via
111 * &struct v4l2_subdev_io_pin_config->value.
124 * struct v4l2_subdev_io_pin_config - Subdevice external IO pin configuration
126 * @flags: bitmask with flags for this pin's config, whose bits are defined by
130 * @value: Initial value for pin - e.g. GPIO output value
142 * struct v4l2_subdev_core_ops - Define core ops callbacks for subdevs
160 * drivers without discussing this first on the linux-media mailinglist.
166 * @command: called by in-kernel drivers in order to call functions internal
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
223 * struct v4l2_subdev_tuner_ops - Callbacks used when v4l device was opened
237 * freq->type must be filled in. Normally done by video_ioctl2()
244 * @s_tuner: callback for VIDIOC_S_TUNER() ioctl handler code. @vt->type must be
283 int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
287 * struct v4l2_subdev_audio_ops - Callbacks used for audio-related settings
289 * @s_clock_freq: set the frequency (in Hz) of the audio clock output.
293 * -EINVAL is returned.
298 * If the frequency is not supported, then %-EINVAL is returned.
300 * @s_routing: used to define the input and/or output pins of an audio chip,
302 * Never attempt to use user-level input IDs (e.g. Composite, S-Video,
306 * The calling driver is responsible for mapping a user-level input to
315 int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
322 * @vc: CSI-2 virtual channel
323 * @dt: CSI-2 data type ID
331 * enum v4l2_mbus_frame_desc_flags - media bus frame description flags
334 * Indicates that &struct v4l2_mbus_frame_desc_entry->length field
346 * struct v4l2_mbus_frame_desc_entry - media bus frame description structure
354 * @bus: Bus-specific frame descriptor parameters
355 * @bus.csi2: CSI-2-specific bus configuration
374 * enum v4l2_mbus_frame_desc_type - media bus frame description type
382 * CSI-2 media bus. Frame desc parameters must be set in
383 * &struct v4l2_mbus_frame_desc_entry->csi2.
392 * struct v4l2_mbus_frame_desc - media bus data frame description
404 * enum v4l2_subdev_pre_streamon_flags - Flags for pre_streamon subdev core op
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().
414 * struct v4l2_subdev_video_ops - Callbacks used when v4l device was opened
423 * to 0. If the frequency is not supported, then -EINVAL is returned.
429 * @s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
432 * @g_std_output: get current standard for video OUTPUT devices. This is ignored
438 * CAPTURE device. This is ignored by video output devices.
441 * OUTPUT device. This is ignored by video capture devices.
447 * sub-device. Failure on stop will remove any resources acquired in
451 * v4l2-subdev.c.
470 * initialising the bus. Current usage is to set a CSI-2 transmitter to
471 * LP-11 or LP-111 mode before streaming. See &enum
475 * indicated by the flags argument. In particular, -EACCES indicates lack
483 int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
502 * struct v4l2_subdev_vbi_ops - Callbacks used when v4l device was opened
516 * should be output. Note that if you set the line field to 0, then that
522 * the readback register contains invalid or erroneous data %-EIO is
547 * struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
550 * several top lines of the output image, or which send their
562 * enum v4l2_subdev_ir_mode- describes the type of IR supported
571 * struct v4l2_subdev_ir_parameters - Parameters for IR TX or TX
589 * @carrier_range_lower: Lower carrier range, in Hz, valid only for modulated
591 * @carrier_range_upper: Upper carrier range, in Hz, valid only for modulated
620 * struct v4l2_subdev_ir_ops - operations for IR subdevices
623 * The semantics are similar to a non-blocking read() call.
632 * settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
639 * The semantics are similar to a non-blocking write() call.
648 * settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
675 * struct v4l2_subdev_pad_config - Used for storing subdev pad information.
690 * struct v4l2_subdev_stream_config - Used for storing stream configuration.
714 * struct v4l2_subdev_stream_configs - A collection of stream configs.
716 * @num_configs: number of entries in @config.
725 * struct v4l2_subdev_krouting - subdev routing table
740 * struct v4l2_subdev_state - Used for storing subdev state information.
744 * @sd: the sub-device which the state is related to
764 * struct v4l2_subdev_pad_ops - v4l2-subdev pad level operations
792 * @s_dv_timings: Set custom dv timings in the sub device. This is used
796 * @g_dv_timings: Get custom dv timings in the sub device.
814 * @get_mbus_config: get the media bus configuration of a remote sub-device.
816 * firmware interface at sub-device probe time, immediately
818 * driver. Remote sub-devices (usually video receivers) shall
821 * Callers should make sure they get the most up-to-date as
838 * V4L2_SUBDEV_CAP_STREAMS sub-device capability flag can ignore the mask
848 * V4L2_SUBDEV_CAP_STREAMS sub-device capability flag can ignore the mask
901 struct v4l2_mbus_config *config);
915 * struct v4l2_subdev_ops - Subdev operations
938 * struct v4l2_subdev_internal_ops - V4L2 subdev internal ops
955 * filehandle to the v4l-subdevX device node was closed. If no device
956 * node was created for this sub-device, then the @release callback
960 * sub-device that sets the V4L2_SUBDEV_FL_HAS_DEVNODE flag.
993 * - Centrally managed subdev active state is enabled
994 * - Legacy pad config is _not_ supported (state->pads is NULL)
995 * - Routing ioctls are available
996 * - Multiple streams per pad are supported
1003 * struct v4l2_subdev_platform_data - regulators config struct
1007 * @host_priv: Per-subdevice data, specific for a certain video host device
1017 * struct v4l2_subdev - describes a V4L2 sub-device
1020 * @list: List of sub-devices
1022 * @owner_v4l2_dev: true if the &sd->owner matches the owner of @v4l2_dev->dev
1025 * %V4L2_SUBDEV_FL_IS_I2C - Set this flag if this subdev is a i2c device;
1026 * %V4L2_SUBDEV_FL_IS_SPI - Set this flag if this subdev is a spi device;
1027 * %V4L2_SUBDEV_FL_HAS_DEVNODE - Set this flag if this subdev needs a
1029 * %V4L2_SUBDEV_FL_HAS_EVENTS - Set this flag if this subdev generates
1037 * @name: Name of the sub-device. Please notice that the name must be unique.
1038 * @grp_id: can be used to group similar subdevs. Value is driver-specific
1045 * either dev->of_node->fwnode or dev->fwnode (whichever is non-NULL).
1047 * @notifier->done_list list.
1050 * @subdev_notifier: A sub-device notifier implicitly registered for the sub-
1069 * stand-alone or embedded in a larger struct.
1120 * media_entity_to_v4l2_subdev - Returns a &struct v4l2_subdev from
1135 * vdev_to_v4l2_subdev - Returns a &struct v4l2_subdev from
1144 * struct v4l2_subdev_fh - Used for storing subdev information per file handle
1161 * to_v4l2_subdev_fh - Returns a &struct v4l2_subdev_fh from
1172 * v4l2_set_subdevdata - Sets V4L2 dev private device data
1179 sd->dev_priv = p; in v4l2_set_subdevdata()
1183 * v4l2_get_subdevdata - Gets V4L2 dev private device data
1191 return sd->dev_priv; in v4l2_get_subdevdata()
1195 * v4l2_set_subdev_hostdata - Sets V4L2 dev private host data
1202 sd->host_priv = p; in v4l2_set_subdev_hostdata()
1206 * v4l2_get_subdev_hostdata - Gets V4L2 dev private data
1214 return sd->host_priv; in v4l2_get_subdev_hostdata()
1220 * v4l2_subdev_get_fwnode_pad_1_to_1 - Get pad number from a subdev fwnode
1237 * v4l2_subdev_link_validate_default - validates a media link
1253 * v4l2_subdev_link_validate - validates a media link
1263 * The function can be used as a drop-in &media_entity_ops.link_validate
1272 * v4l2_subdev_has_pad_interdep - MC has_pad_interdep implementation for subdevs
1290 * __v4l2_subdev_state_alloc - allocate v4l2_subdev_state
1305 * __v4l2_subdev_state_free - free a v4l2_subdev_state
1314 * v4l2_subdev_init_finalize() - Finalizes the initialization of the subdevice
1331 ":" __stringify(__LINE__) ":sd->active_state->lock"; \
1339 * v4l2_subdev_cleanup() - Releases the resources allocated by the subdevice
1342 * Clean up a V4L2 async sub-device. Must be called for a sub-device as part of
1349 * A macro to generate the macro or function name for sub-devices state access
1366 * v4l2_subdev_state_get_format() - Get pointer to a stream format
1374 * For stream-unaware drivers the format for the corresponding pad is returned.
1385 * const-correctness in all cases.
1401 * v4l2_subdev_state_get_crop() - Get pointer to a stream crop rectangle
1409 * For stream-unaware drivers the crop rectangle for the corresponding pad is
1423 * v4l2_subdev_state_get_compose() - Get pointer to a stream compose rectangle
1431 * For stream-unaware drivers the compose rectangle for the corresponding pad is
1445 * v4l2_subdev_state_get_interval() - Get pointer to a stream frame interval
1453 * For stream-unaware drivers the frame interval for the corresponding pad is
1469 * v4l2_subdev_get_fmt() - Fill format based on state
1474 * Fill @format->format field based on the information in the @format struct.
1486 * v4l2_subdev_get_frame_interval() - Fill frame interval based on state
1491 * Fill @fi->interval field based on the information in the @fi struct.
1504 * v4l2_subdev_set_routing() - Set given routing to subdev state
1524 * for_each_active_route - iterate on all active routes of a routing table
1533 * v4l2_subdev_set_routing_with_fmt() - Set given routing and format to subdev
1549 * v4l2_subdev_routing_find_opposite_end() - Find the opposite stream
1562 * Returns 0 on success, or -EINVAL if no matching route is found.
1569 * v4l2_subdev_state_get_opposite_stream_format() - Get pointer to opposite
1585 * v4l2_subdev_state_xlate_streams() - Translate streams from one pad to another
1608 * enum v4l2_subdev_routing_restriction - Subdevice internal routing restrictions
1611 * an input stream shall not be routed to multiple output streams (stream
1614 * multiple input streams shall not be routed to the same output stream
1625 * only non-overlapping 1-to-1 stream routing is allowed (a combination of
1654 * v4l2_subdev_routing_validate() - Verify that routes comply with driver
1669 * v4l2_subdev_enable_streams() - Enable streams on a pad
1680 * contains an already enabled stream, this function returns -EALREADY without
1683 * Per-stream enable is only available for subdevs that implement the
1685 * function implements a best-effort compatibility by calling the .s_stream()
1688 * Drivers that are not stream-aware shall set @streams_mask to BIT_ULL(0).
1692 * * -EALREADY: One of the streams in streams_mask is already enabled
1693 * * -EINVAL: The pad index is invalid, or doesn't correspond to a source pad
1694 * * -EOPNOTSUPP: Falling back to the legacy .s_stream() operation is
1701 * v4l2_subdev_disable_streams() - Disable streams on a pad
1712 * contains a disabled stream, this function returns -EALREADY without
1715 * Per-stream disable is only available for subdevs that implement the
1717 * function implements a best-effort compatibility by calling the .s_stream()
1720 * Drivers that are not stream-aware shall set @streams_mask to BIT_ULL(0).
1724 * * -EALREADY: One of the streams in streams_mask is not enabled
1725 * * -EINVAL: The pad index is invalid, or doesn't correspond to a source pad
1726 * * -EOPNOTSUPP: Falling back to the legacy .s_stream() operation is
1733 * v4l2_subdev_s_stream_helper() - Helper to implement the subdev s_stream
1738 * Subdevice drivers that implement the streams-aware
1754 * v4l2_subdev_lock_state() - Locks the subdev state
1763 mutex_lock(state->lock); in v4l2_subdev_lock_state()
1767 * v4l2_subdev_unlock_state() - Unlocks the subdev state
1774 mutex_unlock(state->lock); in v4l2_subdev_unlock_state()
1778 * v4l2_subdev_lock_states - Lock two sub-device states
1782 * Locks the state of two sub-devices.
1794 mutex_lock(state1->lock); in v4l2_subdev_lock_states()
1795 if (state1->lock != state2->lock) in v4l2_subdev_lock_states()
1796 mutex_lock(state2->lock); in v4l2_subdev_lock_states()
1800 * v4l2_subdev_unlock_states() - Unlock two sub-device states
1804 * Unlocks the state of two sub-devices.
1812 mutex_unlock(state1->lock); in v4l2_subdev_unlock_states()
1813 if (state1->lock != state2->lock) in v4l2_subdev_unlock_states()
1814 mutex_unlock(state2->lock); in v4l2_subdev_unlock_states()
1818 * v4l2_subdev_get_unlocked_active_state() - Checks that the active subdev state
1832 if (sd->active_state) in v4l2_subdev_get_unlocked_active_state()
1833 lockdep_assert_not_held(sd->active_state->lock); in v4l2_subdev_get_unlocked_active_state()
1834 return sd->active_state; in v4l2_subdev_get_unlocked_active_state()
1838 * v4l2_subdev_get_locked_active_state() - Checks that the active subdev state
1853 if (sd->active_state) in v4l2_subdev_get_locked_active_state()
1854 lockdep_assert_held(sd->active_state->lock); in v4l2_subdev_get_locked_active_state()
1855 return sd->active_state; in v4l2_subdev_get_locked_active_state()
1859 * v4l2_subdev_lock_and_get_active_state() - Locks and returns the active subdev
1871 if (sd->active_state) in v4l2_subdev_lock_and_get_active_state()
1872 v4l2_subdev_lock_state(sd->active_state); in v4l2_subdev_lock_and_get_active_state()
1873 return sd->active_state; in v4l2_subdev_lock_and_get_active_state()
1877 * v4l2_subdev_init - initializes the sub-device struct
1888 * v4l2_subdev_call - call an operation of a v4l2_subdev.
1905 __result = -ENODEV; \
1906 else if (!(__sd->ops->o && __sd->ops->o->f)) \
1907 __result = -ENOIOCTLCMD; \
1909 v4l2_subdev_call_wrappers.o->f) \
1910 __result = v4l2_subdev_call_wrappers.o->f( \
1913 __result = __sd->ops->o->f(__sd, ##args); \
1918 * v4l2_subdev_call_state_active - call an operation of a v4l2_subdev which
1948 * v4l2_subdev_call_state_try - call an operation of a v4l2_subdev which
1964 * Note: only legacy non-MC drivers may need this macro.
1971 ":" __stringify(__LINE__) ":state->lock"; \
1982 * v4l2_subdev_has_op - Checks if a subdev defines a certain operation.
1990 ((sd)->ops->o && (sd)->ops->o->f)
1993 * v4l2_subdev_notify_event() - Delivers event notification for subdevice
2006 * v4l2_subdev_is_streaming() - Returns if the subdevice is streaming