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![lijian](/assets/img/avatar_default.png)
Prefer 'unsigned int' to bare use of 'unsigned'. So modified variable type 'unsigned' to 'unsigned int' in v4l2-event.c. Signed-off-by: lijian <lijian@yulong.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
373 lines
8.5 KiB
C
373 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* v4l2-event.c
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*
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* V4L2 events.
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*
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* Copyright (C) 2009--2010 Nokia Corporation.
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*
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* Contact: Sakari Ailus <sakari.ailus@iki.fi>
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*/
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#include <media/v4l2-dev.h>
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#include <media/v4l2-fh.h>
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#include <media/v4l2-event.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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static unsigned int sev_pos(const struct v4l2_subscribed_event *sev, unsigned int idx)
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{
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idx += sev->first;
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return idx >= sev->elems ? idx - sev->elems : idx;
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}
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static int __v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event)
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{
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struct v4l2_kevent *kev;
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struct timespec64 ts;
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unsigned long flags;
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spin_lock_irqsave(&fh->vdev->fh_lock, flags);
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if (list_empty(&fh->available)) {
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spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
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return -ENOENT;
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}
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WARN_ON(fh->navailable == 0);
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kev = list_first_entry(&fh->available, struct v4l2_kevent, list);
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list_del(&kev->list);
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fh->navailable--;
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kev->event.pending = fh->navailable;
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*event = kev->event;
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ts = ns_to_timespec64(kev->ts);
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event->timestamp.tv_sec = ts.tv_sec;
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event->timestamp.tv_nsec = ts.tv_nsec;
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kev->sev->first = sev_pos(kev->sev, 1);
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kev->sev->in_use--;
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spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
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return 0;
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}
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int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
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int nonblocking)
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{
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int ret;
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if (nonblocking)
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return __v4l2_event_dequeue(fh, event);
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/* Release the vdev lock while waiting */
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if (fh->vdev->lock)
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mutex_unlock(fh->vdev->lock);
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do {
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ret = wait_event_interruptible(fh->wait,
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fh->navailable != 0);
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if (ret < 0)
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break;
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ret = __v4l2_event_dequeue(fh, event);
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} while (ret == -ENOENT);
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if (fh->vdev->lock)
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mutex_lock(fh->vdev->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(v4l2_event_dequeue);
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/* Caller must hold fh->vdev->fh_lock! */
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static struct v4l2_subscribed_event *v4l2_event_subscribed(
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struct v4l2_fh *fh, u32 type, u32 id)
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{
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struct v4l2_subscribed_event *sev;
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assert_spin_locked(&fh->vdev->fh_lock);
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list_for_each_entry(sev, &fh->subscribed, list)
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if (sev->type == type && sev->id == id)
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return sev;
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return NULL;
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}
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static void __v4l2_event_queue_fh(struct v4l2_fh *fh,
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const struct v4l2_event *ev, u64 ts)
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{
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struct v4l2_subscribed_event *sev;
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struct v4l2_kevent *kev;
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bool copy_payload = true;
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/* Are we subscribed? */
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sev = v4l2_event_subscribed(fh, ev->type, ev->id);
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if (sev == NULL)
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return;
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/* Increase event sequence number on fh. */
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fh->sequence++;
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/* Do we have any free events? */
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if (sev->in_use == sev->elems) {
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/* no, remove the oldest one */
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kev = sev->events + sev_pos(sev, 0);
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list_del(&kev->list);
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sev->in_use--;
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sev->first = sev_pos(sev, 1);
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fh->navailable--;
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if (sev->elems == 1) {
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if (sev->ops && sev->ops->replace) {
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sev->ops->replace(&kev->event, ev);
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copy_payload = false;
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}
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} else if (sev->ops && sev->ops->merge) {
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struct v4l2_kevent *second_oldest =
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sev->events + sev_pos(sev, 0);
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sev->ops->merge(&kev->event, &second_oldest->event);
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}
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}
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/* Take one and fill it. */
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kev = sev->events + sev_pos(sev, sev->in_use);
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kev->event.type = ev->type;
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if (copy_payload)
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kev->event.u = ev->u;
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kev->event.id = ev->id;
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kev->ts = ts;
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kev->event.sequence = fh->sequence;
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sev->in_use++;
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list_add_tail(&kev->list, &fh->available);
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fh->navailable++;
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wake_up_all(&fh->wait);
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}
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void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev)
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{
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struct v4l2_fh *fh;
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unsigned long flags;
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u64 ts;
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if (vdev == NULL)
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return;
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ts = ktime_get_ns();
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spin_lock_irqsave(&vdev->fh_lock, flags);
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list_for_each_entry(fh, &vdev->fh_list, list)
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__v4l2_event_queue_fh(fh, ev, ts);
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spin_unlock_irqrestore(&vdev->fh_lock, flags);
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}
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EXPORT_SYMBOL_GPL(v4l2_event_queue);
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void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev)
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{
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unsigned long flags;
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u64 ts = ktime_get_ns();
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spin_lock_irqsave(&fh->vdev->fh_lock, flags);
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__v4l2_event_queue_fh(fh, ev, ts);
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spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
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}
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EXPORT_SYMBOL_GPL(v4l2_event_queue_fh);
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int v4l2_event_pending(struct v4l2_fh *fh)
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{
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return fh->navailable;
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}
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EXPORT_SYMBOL_GPL(v4l2_event_pending);
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void v4l2_event_wake_all(struct video_device *vdev)
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{
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struct v4l2_fh *fh;
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unsigned long flags;
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if (!vdev)
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return;
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spin_lock_irqsave(&vdev->fh_lock, flags);
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list_for_each_entry(fh, &vdev->fh_list, list)
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wake_up_all(&fh->wait);
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spin_unlock_irqrestore(&vdev->fh_lock, flags);
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}
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EXPORT_SYMBOL_GPL(v4l2_event_wake_all);
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static void __v4l2_event_unsubscribe(struct v4l2_subscribed_event *sev)
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{
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struct v4l2_fh *fh = sev->fh;
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unsigned int i;
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lockdep_assert_held(&fh->subscribe_lock);
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assert_spin_locked(&fh->vdev->fh_lock);
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/* Remove any pending events for this subscription */
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for (i = 0; i < sev->in_use; i++) {
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list_del(&sev->events[sev_pos(sev, i)].list);
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fh->navailable--;
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}
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list_del(&sev->list);
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}
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int v4l2_event_subscribe(struct v4l2_fh *fh,
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const struct v4l2_event_subscription *sub, unsigned int elems,
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const struct v4l2_subscribed_event_ops *ops)
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{
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struct v4l2_subscribed_event *sev, *found_ev;
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unsigned long flags;
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unsigned int i;
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int ret = 0;
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if (sub->type == V4L2_EVENT_ALL)
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return -EINVAL;
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if (elems < 1)
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elems = 1;
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sev = kvzalloc(struct_size(sev, events, elems), GFP_KERNEL);
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if (!sev)
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return -ENOMEM;
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for (i = 0; i < elems; i++)
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sev->events[i].sev = sev;
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sev->type = sub->type;
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sev->id = sub->id;
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sev->flags = sub->flags;
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sev->fh = fh;
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sev->ops = ops;
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sev->elems = elems;
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mutex_lock(&fh->subscribe_lock);
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spin_lock_irqsave(&fh->vdev->fh_lock, flags);
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found_ev = v4l2_event_subscribed(fh, sub->type, sub->id);
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if (!found_ev)
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list_add(&sev->list, &fh->subscribed);
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spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
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if (found_ev) {
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/* Already listening */
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kvfree(sev);
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} else if (sev->ops && sev->ops->add) {
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ret = sev->ops->add(sev, elems);
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if (ret) {
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spin_lock_irqsave(&fh->vdev->fh_lock, flags);
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__v4l2_event_unsubscribe(sev);
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spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
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kvfree(sev);
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}
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}
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mutex_unlock(&fh->subscribe_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(v4l2_event_subscribe);
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void v4l2_event_unsubscribe_all(struct v4l2_fh *fh)
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{
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struct v4l2_event_subscription sub;
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struct v4l2_subscribed_event *sev;
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unsigned long flags;
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do {
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sev = NULL;
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spin_lock_irqsave(&fh->vdev->fh_lock, flags);
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if (!list_empty(&fh->subscribed)) {
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sev = list_first_entry(&fh->subscribed,
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struct v4l2_subscribed_event, list);
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sub.type = sev->type;
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sub.id = sev->id;
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}
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spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
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if (sev)
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v4l2_event_unsubscribe(fh, &sub);
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} while (sev);
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}
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EXPORT_SYMBOL_GPL(v4l2_event_unsubscribe_all);
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int v4l2_event_unsubscribe(struct v4l2_fh *fh,
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const struct v4l2_event_subscription *sub)
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{
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struct v4l2_subscribed_event *sev;
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unsigned long flags;
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if (sub->type == V4L2_EVENT_ALL) {
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v4l2_event_unsubscribe_all(fh);
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return 0;
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}
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mutex_lock(&fh->subscribe_lock);
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spin_lock_irqsave(&fh->vdev->fh_lock, flags);
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sev = v4l2_event_subscribed(fh, sub->type, sub->id);
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if (sev != NULL)
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__v4l2_event_unsubscribe(sev);
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spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
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if (sev && sev->ops && sev->ops->del)
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sev->ops->del(sev);
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mutex_unlock(&fh->subscribe_lock);
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kvfree(sev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(v4l2_event_unsubscribe);
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int v4l2_event_subdev_unsubscribe(struct v4l2_subdev *sd, struct v4l2_fh *fh,
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struct v4l2_event_subscription *sub)
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{
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return v4l2_event_unsubscribe(fh, sub);
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}
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EXPORT_SYMBOL_GPL(v4l2_event_subdev_unsubscribe);
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static void v4l2_event_src_replace(struct v4l2_event *old,
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const struct v4l2_event *new)
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{
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u32 old_changes = old->u.src_change.changes;
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old->u.src_change = new->u.src_change;
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old->u.src_change.changes |= old_changes;
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}
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static void v4l2_event_src_merge(const struct v4l2_event *old,
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struct v4l2_event *new)
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{
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new->u.src_change.changes |= old->u.src_change.changes;
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}
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static const struct v4l2_subscribed_event_ops v4l2_event_src_ch_ops = {
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.replace = v4l2_event_src_replace,
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.merge = v4l2_event_src_merge,
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};
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int v4l2_src_change_event_subscribe(struct v4l2_fh *fh,
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const struct v4l2_event_subscription *sub)
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{
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if (sub->type == V4L2_EVENT_SOURCE_CHANGE)
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return v4l2_event_subscribe(fh, sub, 0, &v4l2_event_src_ch_ops);
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(v4l2_src_change_event_subscribe);
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int v4l2_src_change_event_subdev_subscribe(struct v4l2_subdev *sd,
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struct v4l2_fh *fh, struct v4l2_event_subscription *sub)
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{
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return v4l2_src_change_event_subscribe(fh, sub);
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}
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EXPORT_SYMBOL_GPL(v4l2_src_change_event_subdev_subscribe);
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