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path: root/drivers/media/video/v4l2-event.c
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Diffstat (limited to 'drivers/media/video/v4l2-event.c')
-rw-r--r--drivers/media/video/v4l2-event.c299
1 files changed, 0 insertions, 299 deletions
diff --git a/drivers/media/video/v4l2-event.c b/drivers/media/video/v4l2-event.c
deleted file mode 100644
index 69fd343d477..00000000000
--- a/drivers/media/video/v4l2-event.c
+++ /dev/null
@@ -1,299 +0,0 @@
-/*
- * v4l2-event.c
- *
- * V4L2 events.
- *
- * Copyright (C) 2009--2010 Nokia Corporation.
- *
- * Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
- * 02110-1301 USA
- */
-
-#include <media/v4l2-dev.h>
-#include <media/v4l2-fh.h>
-#include <media/v4l2-event.h>
-
-#include <linux/sched.h>
-#include <linux/slab.h>
-
-int v4l2_event_init(struct v4l2_fh *fh)
-{
- fh->events = kzalloc(sizeof(*fh->events), GFP_KERNEL);
- if (fh->events == NULL)
- return -ENOMEM;
-
- init_waitqueue_head(&fh->events->wait);
-
- INIT_LIST_HEAD(&fh->events->free);
- INIT_LIST_HEAD(&fh->events->available);
- INIT_LIST_HEAD(&fh->events->subscribed);
-
- fh->events->sequence = -1;
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(v4l2_event_init);
-
-int v4l2_event_alloc(struct v4l2_fh *fh, unsigned int n)
-{
- struct v4l2_events *events = fh->events;
- unsigned long flags;
-
- if (!events) {
- WARN_ON(1);
- return -ENOMEM;
- }
-
- while (events->nallocated < n) {
- struct v4l2_kevent *kev;
-
- kev = kzalloc(sizeof(*kev), GFP_KERNEL);
- if (kev == NULL)
- return -ENOMEM;
-
- spin_lock_irqsave(&fh->vdev->fh_lock, flags);
- list_add_tail(&kev->list, &events->free);
- events->nallocated++;
- spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
- }
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(v4l2_event_alloc);
-
-#define list_kfree(list, type, member) \
- while (!list_empty(list)) { \
- type *hi; \
- hi = list_first_entry(list, type, member); \
- list_del(&hi->member); \
- kfree(hi); \
- }
-
-void v4l2_event_free(struct v4l2_fh *fh)
-{
- struct v4l2_events *events = fh->events;
-
- if (!events)
- return;
-
- list_kfree(&events->free, struct v4l2_kevent, list);
- list_kfree(&events->available, struct v4l2_kevent, list);
- list_kfree(&events->subscribed, struct v4l2_subscribed_event, list);
-
- kfree(events);
- fh->events = NULL;
-}
-EXPORT_SYMBOL_GPL(v4l2_event_free);
-
-static int __v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event)
-{
- struct v4l2_events *events = fh->events;
- struct v4l2_kevent *kev;
- unsigned long flags;
-
- spin_lock_irqsave(&fh->vdev->fh_lock, flags);
-
- if (list_empty(&events->available)) {
- spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
- return -ENOENT;
- }
-
- WARN_ON(events->navailable == 0);
-
- kev = list_first_entry(&events->available, struct v4l2_kevent, list);
- list_move(&kev->list, &events->free);
- events->navailable--;
-
- kev->event.pending = events->navailable;
- *event = kev->event;
-
- spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
-
- return 0;
-}
-
-int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
- int nonblocking)
-{
- struct v4l2_events *events = fh->events;
- int ret;
-
- if (nonblocking)
- return __v4l2_event_dequeue(fh, event);
-
- /* Release the vdev lock while waiting */
- if (fh->vdev->lock)
- mutex_unlock(fh->vdev->lock);
-
- do {
- ret = wait_event_interruptible(events->wait,
- events->navailable != 0);
- if (ret < 0)
- break;
-
- ret = __v4l2_event_dequeue(fh, event);
- } while (ret == -ENOENT);
-
- if (fh->vdev->lock)
- mutex_lock(fh->vdev->lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(v4l2_event_dequeue);
-
-/* Caller must hold fh->event->lock! */
-static struct v4l2_subscribed_event *v4l2_event_subscribed(
- struct v4l2_fh *fh, u32 type)
-{
- struct v4l2_events *events = fh->events;
- struct v4l2_subscribed_event *sev;
-
- assert_spin_locked(&fh->vdev->fh_lock);
-
- list_for_each_entry(sev, &events->subscribed, list) {
- if (sev->type == type)
- return sev;
- }
-
- return NULL;
-}
-
-void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev)
-{
- struct v4l2_fh *fh;
- unsigned long flags;
- struct timespec timestamp;
-
- ktime_get_ts(&timestamp);
-
- spin_lock_irqsave(&vdev->fh_lock, flags);
-
- list_for_each_entry(fh, &vdev->fh_list, list) {
- struct v4l2_events *events = fh->events;
- struct v4l2_kevent *kev;
-
- /* Are we subscribed? */
- if (!v4l2_event_subscribed(fh, ev->type))
- continue;
-
- /* Increase event sequence number on fh. */
- events->sequence++;
-
- /* Do we have any free events? */
- if (list_empty(&events->free))
- continue;
-
- /* Take one and fill it. */
- kev = list_first_entry(&events->free, struct v4l2_kevent, list);
- kev->event.type = ev->type;
- kev->event.u = ev->u;
- kev->event.timestamp = timestamp;
- kev->event.sequence = events->sequence;
- list_move_tail(&kev->list, &events->available);
-
- events->navailable++;
-
- wake_up_all(&events->wait);
- }
-
- spin_unlock_irqrestore(&vdev->fh_lock, flags);
-}
-EXPORT_SYMBOL_GPL(v4l2_event_queue);
-
-int v4l2_event_pending(struct v4l2_fh *fh)
-{
- return fh->events->navailable;
-}
-EXPORT_SYMBOL_GPL(v4l2_event_pending);
-
-int v4l2_event_subscribe(struct v4l2_fh *fh,
- struct v4l2_event_subscription *sub)
-{
- struct v4l2_events *events = fh->events;
- struct v4l2_subscribed_event *sev;
- unsigned long flags;
-
- if (fh->events == NULL) {
- WARN_ON(1);
- return -ENOMEM;
- }
-
- sev = kmalloc(sizeof(*sev), GFP_KERNEL);
- if (!sev)
- return -ENOMEM;
-
- spin_lock_irqsave(&fh->vdev->fh_lock, flags);
-
- if (v4l2_event_subscribed(fh, sub->type) == NULL) {
- INIT_LIST_HEAD(&sev->list);
- sev->type = sub->type;
-
- list_add(&sev->list, &events->subscribed);
- sev = NULL;
- }
-
- spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
-
- kfree(sev);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(v4l2_event_subscribe);
-
-static void v4l2_event_unsubscribe_all(struct v4l2_fh *fh)
-{
- struct v4l2_events *events = fh->events;
- struct v4l2_subscribed_event *sev;
- unsigned long flags;
-
- do {
- sev = NULL;
-
- spin_lock_irqsave(&fh->vdev->fh_lock, flags);
- if (!list_empty(&events->subscribed)) {
- sev = list_first_entry(&events->subscribed,
- struct v4l2_subscribed_event, list);
- list_del(&sev->list);
- }
- spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
- kfree(sev);
- } while (sev);
-}
-
-int v4l2_event_unsubscribe(struct v4l2_fh *fh,
- struct v4l2_event_subscription *sub)
-{
- struct v4l2_subscribed_event *sev;
- unsigned long flags;
-
- if (sub->type == V4L2_EVENT_ALL) {
- v4l2_event_unsubscribe_all(fh);
- return 0;
- }
-
- spin_lock_irqsave(&fh->vdev->fh_lock, flags);
-
- sev = v4l2_event_subscribed(fh, sub->type);
- if (sev != NULL)
- list_del(&sev->list);
-
- spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
-
- kfree(sev);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(v4l2_event_unsubscribe);
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