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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.c93
1 files changed, 25 insertions, 68 deletions
diff --git a/drivers/media/video/v4l2-event.c b/drivers/media/video/v4l2-event.c
index 670f2f834e6..70fa82daaca 100644
--- a/drivers/media/video/v4l2-event.c
+++ b/drivers/media/video/v4l2-event.c
@@ -32,35 +32,11 @@
static void v4l2_event_unsubscribe_all(struct v4l2_fh *fh);
-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) {
+ while (fh->nallocated < n) {
struct v4l2_kevent *kev;
kev = kzalloc(sizeof(*kev), GFP_KERNEL);
@@ -68,8 +44,8 @@ int v4l2_event_alloc(struct v4l2_fh *fh, unsigned int n)
return -ENOMEM;
spin_lock_irqsave(&fh->vdev->fh_lock, flags);
- list_add_tail(&kev->list, &events->free);
- events->nallocated++;
+ list_add_tail(&kev->list, &fh->free);
+ fh->nallocated++;
spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
}
@@ -87,40 +63,31 @@ EXPORT_SYMBOL_GPL(v4l2_event_alloc);
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(&fh->free, struct v4l2_kevent, list);
+ list_kfree(&fh->available, struct v4l2_kevent, list);
v4l2_event_unsubscribe_all(fh);
-
- 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)) {
+ if (list_empty(&fh->available)) {
spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
return -ENOENT;
}
- WARN_ON(events->navailable == 0);
+ WARN_ON(fh->navailable == 0);
- kev = list_first_entry(&events->available, struct v4l2_kevent, list);
- list_move(&kev->list, &events->free);
- events->navailable--;
+ kev = list_first_entry(&fh->available, struct v4l2_kevent, list);
+ list_move(&kev->list, &fh->free);
+ fh->navailable--;
- kev->event.pending = events->navailable;
+ kev->event.pending = fh->navailable;
*event = kev->event;
spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
@@ -131,7 +98,6 @@ static int __v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event)
int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
int nonblocking)
{
- struct v4l2_events *events = fh->events;
int ret;
if (nonblocking)
@@ -142,8 +108,8 @@ int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
mutex_unlock(fh->vdev->lock);
do {
- ret = wait_event_interruptible(events->wait,
- events->navailable != 0);
+ ret = wait_event_interruptible(fh->wait,
+ fh->navailable != 0);
if (ret < 0)
break;
@@ -161,12 +127,11 @@ EXPORT_SYMBOL_GPL(v4l2_event_dequeue);
static struct v4l2_subscribed_event *v4l2_event_subscribed(
struct v4l2_fh *fh, u32 type, u32 id)
{
- 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) {
+ list_for_each_entry(sev, &fh->subscribed, list) {
if (sev->type == type && sev->id == id)
return sev;
}
@@ -177,7 +142,6 @@ static struct v4l2_subscribed_event *v4l2_event_subscribed(
static void __v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev,
const struct timespec *ts)
{
- struct v4l2_events *events = fh->events;
struct v4l2_subscribed_event *sev;
struct v4l2_kevent *kev;
@@ -187,24 +151,24 @@ static void __v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *e
return;
/* Increase event sequence number on fh. */
- events->sequence++;
+ fh->sequence++;
/* Do we have any free events? */
- if (list_empty(&events->free))
+ if (list_empty(&fh->free))
return;
/* Take one and fill it. */
- kev = list_first_entry(&events->free, struct v4l2_kevent, list);
+ kev = list_first_entry(&fh->free, struct v4l2_kevent, list);
kev->event.type = ev->type;
kev->event.u = ev->u;
kev->event.id = ev->id;
kev->event.timestamp = *ts;
- kev->event.sequence = events->sequence;
- list_move_tail(&kev->list, &events->available);
+ kev->event.sequence = fh->sequence;
+ list_move_tail(&kev->list, &fh->available);
- events->navailable++;
+ fh->navailable++;
- wake_up_all(&events->wait);
+ wake_up_all(&fh->wait);
}
void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev)
@@ -240,24 +204,18 @@ EXPORT_SYMBOL_GPL(v4l2_event_queue_fh);
int v4l2_event_pending(struct v4l2_fh *fh)
{
- return fh->events->navailable;
+ return fh->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, *found_ev;
struct v4l2_ctrl *ctrl = NULL;
struct v4l2_ctrl_fh *ctrl_fh = NULL;
unsigned long flags;
- if (fh->events == NULL) {
- WARN_ON(1);
- return -ENOMEM;
- }
-
if (sub->type == V4L2_EVENT_CTRL) {
ctrl = v4l2_ctrl_find(fh->ctrl_handler, sub->id);
if (ctrl == NULL)
@@ -284,7 +242,7 @@ int v4l2_event_subscribe(struct v4l2_fh *fh,
sev->type = sub->type;
sev->id = sub->id;
- list_add(&sev->list, &events->subscribed);
+ list_add(&sev->list, &fh->subscribed);
sev = NULL;
}
@@ -306,7 +264,6 @@ EXPORT_SYMBOL_GPL(v4l2_event_subscribe);
static void v4l2_event_unsubscribe_all(struct v4l2_fh *fh)
{
- struct v4l2_events *events = fh->events;
struct v4l2_event_subscription sub;
struct v4l2_subscribed_event *sev;
unsigned long flags;
@@ -315,8 +272,8 @@ static void v4l2_event_unsubscribe_all(struct v4l2_fh *fh)
sev = NULL;
spin_lock_irqsave(&fh->vdev->fh_lock, flags);
- if (!list_empty(&events->subscribed)) {
- sev = list_first_entry(&events->subscribed,
+ if (!list_empty(&fh->subscribed)) {
+ sev = list_first_entry(&fh->subscribed,
struct v4l2_subscribed_event, list);
sub.type = sev->type;
sub.id = sev->id;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-24 08:12:52 +0000