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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* v4l2-event.h
*
* V4L2 events.
*
* Copyright (C) 2009--2010 Nokia Corporation.
*
* Contact: Sakari Ailus <sakari.ailus@iki.fi>
*/
#ifndef V4L2_EVENT_H
#define V4L2_EVENT_H
#include <linux/types.h>
#include <linux/videodev2.h>
#include <linux/wait.h>
struct v4l2_fh;
struct v4l2_subdev;
struct v4l2_subscribed_event;
struct video_device;
/**
* struct v4l2_kevent - Internal kernel event struct.
* @list: List node for the v4l2_fh->available list.
* @sev: Pointer to parent v4l2_subscribed_event.
* @event: The event itself.
* @ts: The timestamp of the event.
*/
struct v4l2_kevent {
struct list_head list;
struct v4l2_subscribed_event *sev;
struct v4l2_event event;
u64 ts;
};
/**
* struct v4l2_subscribed_event_ops - Subscribed event operations.
*
* @add: Optional callback, called when a new listener is added
* @del: Optional callback, called when a listener stops listening
* @replace: Optional callback that can replace event 'old' with event 'new'.
* @merge: Optional callback that can merge event 'old' into event 'new'.
*/
struct v4l2_subscribed_event_ops {
int (*add)(struct v4l2_subscribed_event *sev, unsigned int elems);
void (*del)(struct v4l2_subscribed_event *sev);
void (*replace)(struct v4l2_event *old, const struct v4l2_event *new);
void (*merge)(const struct v4l2_event *old, struct v4l2_event *new);
};
/**
* struct v4l2_subscribed_event - Internal struct representing a subscribed
* event.
*
* @list: List node for the v4l2_fh->subscribed list.
* @type: Event type.
* @id: Associated object ID (e.g. control ID). 0 if there isn't any.
* @flags: Copy of v4l2_event_subscription->flags.
* @fh: Filehandle that subscribed to this event.
* @node: List node that hooks into the object's event list
* (if there is one).
* @ops: v4l2_subscribed_event_ops
* @elems: The number of elements in the events array.
* @first: The index of the events containing the oldest available event.
* @in_use: The number of queued events.
* @events: An array of @elems events.
*/
struct v4l2_subscribed_event {
struct list_head list;
u32 type;
u32 id;
u32 flags;
struct v4l2_fh *fh;
struct list_head node;
const struct v4l2_subscribed_event_ops *ops;
unsigned int elems;
unsigned int first;
unsigned int in_use;
struct v4l2_kevent events[] __counted_by(elems);
};
/**
* v4l2_event_dequeue - Dequeue events from video device.
*
* @fh: pointer to struct v4l2_fh
* @event: pointer to struct v4l2_event
* @nonblocking: if not zero, waits for an event to arrive
*/
int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
int nonblocking);
/**
* v4l2_event_queue - Queue events to video device.
*
* @vdev: pointer to &struct video_device
* @ev: pointer to &struct v4l2_event
*
* The event will be queued for all &struct v4l2_fh file handlers.
*
* .. note::
* The driver's only responsibility is to fill in the type and the data
* fields. The other fields will be filled in by V4L2.
*/
void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev);
/**
* v4l2_event_queue_fh - Queue events to video device.
*
* @fh: pointer to &struct v4l2_fh
* @ev: pointer to &struct v4l2_event
*
*
* The event will be queued only for the specified &struct v4l2_fh file handler.
*
* .. note::
* The driver's only responsibility is to fill in the type and the data
* fields. The other fields will be filled in by V4L2.
*/
void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev);
/**
* v4l2_event_wake_all - Wake all filehandles.
*
* Used when unregistering a video device.
*
* @vdev: pointer to &struct video_device
*/
void v4l2_event_wake_all(struct video_device *vdev);
/**
* v4l2_event_pending - Check if an event is available
*
* @fh: pointer to &struct v4l2_fh
*
* Returns the number of pending events.
*/
int v4l2_event_pending(struct v4l2_fh *fh);
/**
* v4l2_event_subscribe - Subscribes to an event
*
* @fh: pointer to &struct v4l2_fh
* @sub: pointer to &struct v4l2_event_subscription
* @elems: size of the events queue
* @ops: pointer to &v4l2_subscribed_event_ops
*
* .. note::
*
* if @elems is zero, the framework will fill in a default value,
* with is currently 1 element.
*/
int v4l2_event_subscribe(struct v4l2_fh *fh,
const struct v4l2_event_subscription *sub,
unsigned int elems,
const struct v4l2_subscribed_event_ops *ops);
/**
* v4l2_event_unsubscribe - Unsubscribes to an event
*
* @fh: pointer to &struct v4l2_fh
* @sub: pointer to &struct v4l2_event_subscription
*/
int v4l2_event_unsubscribe(struct v4l2_fh *fh,
const struct v4l2_event_subscription *sub);
/**
* v4l2_event_unsubscribe_all - Unsubscribes to all events
*
* @fh: pointer to &struct v4l2_fh
*/
void v4l2_event_unsubscribe_all(struct v4l2_fh *fh);
/**
* v4l2_event_subdev_unsubscribe - Subdev variant of v4l2_event_unsubscribe()
*
* @sd: pointer to &struct v4l2_subdev
* @fh: pointer to &struct v4l2_fh
* @sub: pointer to &struct v4l2_event_subscription
*
* .. note::
*
* This function should be used for the &struct v4l2_subdev_core_ops
* %unsubscribe_event field.
*/
int v4l2_event_subdev_unsubscribe(struct v4l2_subdev *sd,
struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);
/**
* v4l2_src_change_event_subscribe - helper function that calls
* v4l2_event_subscribe() if the event is %V4L2_EVENT_SOURCE_CHANGE.
*
* @fh: pointer to struct v4l2_fh
* @sub: pointer to &struct v4l2_event_subscription
*/
int v4l2_src_change_event_subscribe(struct v4l2_fh *fh,
const struct v4l2_event_subscription *sub);
/**
* v4l2_src_change_event_subdev_subscribe - Variant of v4l2_event_subscribe(),
* meant to subscribe only events of the type %V4L2_EVENT_SOURCE_CHANGE.
*
* @sd: pointer to &struct v4l2_subdev
* @fh: pointer to &struct v4l2_fh
* @sub: pointer to &struct v4l2_event_subscription
*/
int v4l2_src_change_event_subdev_subscribe(struct v4l2_subdev *sd,
struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);
#endif /* V4L2_EVENT_H */
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| davinci | Folder | 0755 |
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| drv-intf | Folder | 0755 |
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| i2c | Folder | 0755 |
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| tpg | Folder | 0755 |
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| cec-notifier.h | File | 5.03 KB | 0644 |
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| cec-pin.h | File | 2.79 KB | 0644 |
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| cec.h | File | 17.87 KB | 0644 |
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| dmxdev.h | File | 5.87 KB | 0644 |
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| dvb-usb-ids.h | File | 19.46 KB | 0644 |
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| dvb_ca_en50221.h | File | 4.35 KB | 0644 |
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| dvb_demux.h | File | 10.77 KB | 0644 |
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| dvb_frontend.h | File | 30.03 KB | 0644 |
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| dvb_net.h | File | 2.25 KB | 0644 |
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| dvb_ringbuffer.h | File | 8.32 KB | 0644 |
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| dvb_vb2.h | File | 7.65 KB | 0644 |
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| dvbdev.h | File | 14.43 KB | 0644 |
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| frame_vector.h | File | 1.42 KB | 0644 |
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| hevc-ctrls.h | File | 9.81 KB | 0644 |
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| imx.h | File | 190 B | 0644 |
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| jpeg.h | File | 500 B | 0644 |
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| media-dev-allocator.h | File | 2.21 KB | 0644 |
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| media-device.h | File | 17.65 KB | 0644 |
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| media-devnode.h | File | 5.29 KB | 0644 |
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| media-entity.h | File | 47.11 KB | 0644 |
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| media-request.h | File | 11.96 KB | 0644 |
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| rc-core.h | File | 12.27 KB | 0644 |
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| rc-map.h | File | 14.41 KB | 0644 |
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| rcar-fcp.h | File | 1.1 KB | 0644 |
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| tuner-types.h | File | 7.54 KB | 0644 |
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| tuner.h | File | 8.4 KB | 0644 |
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| tveeprom.h | File | 3.3 KB | 0644 |
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| v4l2-async.h | File | 11.27 KB | 0644 |
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| v4l2-common.h | File | 19.96 KB | 0644 |
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| v4l2-ctrls.h | File | 54.21 KB | 0644 |
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| v4l2-dev.h | File | 20.11 KB | 0644 |
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| v4l2-device.h | File | 18.61 KB | 0644 |
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| v4l2-dv-timings.h | File | 9.08 KB | 0644 |
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| v4l2-event.h | File | 6.01 KB | 0644 |
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| v4l2-fh.h | File | 4.22 KB | 0644 |
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| v4l2-flash-led-class.h | File | 5.75 KB | 0644 |
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| v4l2-fwnode.h | File | 18.25 KB | 0644 |
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| v4l2-h264.h | File | 2.85 KB | 0644 |
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| v4l2-image-sizes.h | File | 827 B | 0644 |
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| v4l2-ioctl.h | File | 33.52 KB | 0644 |
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| v4l2-jpeg.h | File | 5.08 KB | 0644 |
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| v4l2-mc.h | File | 7.78 KB | 0644 |
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| v4l2-mediabus.h | File | 8.65 KB | 0644 |
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| v4l2-mem2mem.h | File | 29.4 KB | 0644 |
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| v4l2-rect.h | File | 5.71 KB | 0644 |
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| v4l2-subdev.h | File | 73.22 KB | 0644 |
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| videobuf-core.h | File | 6.81 KB | 0644 |
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| videobuf-dma-contig.h | File | 909 B | 0644 |
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| videobuf-dma-sg.h | File | 2.79 KB | 0644 |
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| videobuf-vmalloc.h | File | 1.14 KB | 0644 |
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| videobuf2-core.h | File | 51.92 KB | 0644 |
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| videobuf2-dma-contig.h | File | 883 B | 0644 |
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| videobuf2-dma-sg.h | File | 698 B | 0644 |
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| videobuf2-dvb.h | File | 1.81 KB | 0644 |
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| videobuf2-memops.h | File | 1.09 KB | 0644 |
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| videobuf2-v4l2.h | File | 14.48 KB | 0644 |
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| videobuf2-vmalloc.h | File | 509 B | 0644 |
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| vsp1.h | File | 3.57 KB | 0644 |
|