@@ -23,6 +23,7 @@
#include <media/v4l2-ioctl.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
#include <media/v4l2-dev.h>
#define call_op(master, op) \
@@ -540,6 +541,44 @@ static bool type_is_int(const struct v4l2_ctrl *ctrl)
}
}
+static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
+{
+ memset(ev->reserved, 0, sizeof(ev->reserved));
+ ev->type = V4L2_EVENT_CTRL;
+ ev->id = ctrl->id;
+ ev->u.ctrl.changes = changes;
+ ev->u.ctrl.type = ctrl->type;
+ ev->u.ctrl.flags = ctrl->flags;
+ if (ctrl->type == V4L2_CTRL_TYPE_STRING)
+ ev->u.ctrl.value64 = 0;
+ else
+ ev->u.ctrl.value64 = ctrl->cur.val64;
+ ev->u.ctrl.minimum = ctrl->minimum;
+ ev->u.ctrl.maximum = ctrl->maximum;
+ if (ctrl->type == V4L2_CTRL_TYPE_MENU)
+ ev->u.ctrl.step = 1;
+ else
+ ev->u.ctrl.step = ctrl->step;
+ ev->u.ctrl.default_value = ctrl->default_value;
+}
+
+static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
+{
+ struct v4l2_event ev;
+ struct v4l2_ctrl_fh *pos;
+
+ if (list_empty(&ctrl->fhs))
+ return;
+ fill_event(&ev, ctrl, changes);
+
+ list_for_each_entry(pos, &ctrl->fhs, node) {
+ if (pos->fh == fh)
+ continue;
+ ev.u.ctrl.flags = ctrl->flags;
+ v4l2_event_queue_fh(pos->fh, &ev);
+ }
+}
+
/* Helper function: copy the current control value back to the caller */
static int cur_to_user(struct v4l2_ext_control *c,
struct v4l2_ctrl *ctrl)
@@ -629,20 +668,30 @@ static int new_to_user(struct v4l2_ext_control *c,
/* Copy the new value to the current value. */
static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl)
{
+ bool changed = false;
+
if (ctrl == NULL)
return;
switch (ctrl->type) {
+ case V4L2_CTRL_TYPE_BUTTON:
+ changed = true;
+ break;
case V4L2_CTRL_TYPE_STRING:
/* strings are always 0-terminated */
+ changed = strcmp(ctrl->string, ctrl->cur.string);
strcpy(ctrl->cur.string, ctrl->string);
break;
case V4L2_CTRL_TYPE_INTEGER64:
+ changed = ctrl->val64 != ctrl->cur.val64;
ctrl->cur.val64 = ctrl->val64;
break;
default:
+ changed = ctrl->val != ctrl->cur.val;
ctrl->cur.val = ctrl->val;
break;
}
+ if (changed)
+ send_event(fh, ctrl, V4L2_EVENT_CTRL_CH_VALUE);
}
/* Copy the current value to the new value */
@@ -787,6 +836,7 @@ void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
{
struct v4l2_ctrl_ref *ref, *next_ref;
struct v4l2_ctrl *ctrl, *next_ctrl;
+ struct v4l2_ctrl_fh *ctrl_fh, *next_ctrl_fh;
if (hdl == NULL || hdl->buckets == NULL)
return;
@@ -800,6 +850,10 @@ void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
/* Free all controls owned by the handler */
list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
list_del(&ctrl->node);
+ list_for_each_entry_safe(ctrl_fh, next_ctrl_fh, &ctrl->fhs, node) {
+ list_del(&ctrl_fh->node);
+ kfree(ctrl_fh);
+ }
kfree(ctrl);
}
kfree(hdl->buckets);
@@ -1006,6 +1060,7 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
}
INIT_LIST_HEAD(&ctrl->node);
+ INIT_LIST_HEAD(&ctrl->fhs);
ctrl->handler = hdl;
ctrl->ops = ops;
ctrl->id = id;
@@ -1147,6 +1202,9 @@ int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
/* Skip handler-private controls. */
if (ctrl->is_private)
continue;
+ /* And control classes */
+ if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
+ continue;
ret = handler_new_ref(hdl, ctrl);
if (ret)
break;
@@ -1175,9 +1233,14 @@ EXPORT_SYMBOL(v4l2_ctrl_cluster);
void v4l2_ctrl_flags(struct v4l2_ctrl *ctrl, u32 clear_flags, u32 set_flags)
{
+ u32 old_flags;
+
if (ctrl == NULL)
return;
+ old_flags = ctrl->flags;
ctrl->flags = (ctrl->flags & ~clear_flags) | set_flags;
+ if (old_flags != ctrl->flags)
+ send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS);
}
EXPORT_SYMBOL(v4l2_ctrl_flags);
@@ -1898,3 +1961,41 @@ int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
return set_ctrl(NULL, ctrl, &val, false);
}
EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
+
+void v4l2_ctrl_add_fh(struct v4l2_ctrl_handler *hdl,
+ struct v4l2_ctrl_fh *ctrl_fh,
+ struct v4l2_event_subscription *sub)
+{
+ struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, sub->id);
+
+ if (ctrl->handler != hdl)
+ v4l2_ctrl_lock(ctrl);
+ list_add_tail(&ctrl_fh->node, &ctrl->fhs);
+ if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS &&
+ (sub->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) {
+ struct v4l2_event ev;
+
+ fill_event(&ev, ctrl, V4L2_EVENT_CTRL_CH_VALUE |
+ V4L2_EVENT_CTRL_CH_FLAGS);
+ v4l2_event_queue_fh(ctrl_fh->fh, &ev);
+ }
+ if (ctrl->handler != hdl)
+ v4l2_ctrl_unlock(ctrl);
+}
+EXPORT_SYMBOL(v4l2_ctrl_add_fh);
+
+void v4l2_ctrl_del_fh(struct v4l2_ctrl *ctrl, struct v4l2_fh *fh)
+{
+ struct v4l2_ctrl_fh *pos;
+
+ v4l2_ctrl_lock(ctrl);
+ list_for_each_entry(pos, &ctrl->fhs, node) {
+ if (pos->fh == fh) {
+ list_del(&pos->node);
+ kfree(pos);
+ break;
+ }
+ }
+ v4l2_ctrl_unlock(ctrl);
+}
+EXPORT_SYMBOL(v4l2_ctrl_del_fh);
@@ -25,10 +25,13 @@
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
+#include <media/v4l2-ctrls.h>
#include <linux/sched.h>
#include <linux/slab.h>
+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);
@@ -91,7 +94,7 @@ void v4l2_event_free(struct v4l2_fh *fh)
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);
+ v4l2_event_unsubscribe_all(fh);
kfree(events);
fh->events = NULL;
@@ -154,9 +157,9 @@ int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
}
EXPORT_SYMBOL_GPL(v4l2_event_dequeue);
-/* Caller must hold fh->event->lock! */
+/* Caller must hold fh->vdev->fh_lock! */
static struct v4l2_subscribed_event *v4l2_event_subscribed(
- struct v4l2_fh *fh, u32 type)
+ struct v4l2_fh *fh, u32 type, u32 id)
{
struct v4l2_events *events = fh->events;
struct v4l2_subscribed_event *sev;
@@ -164,13 +167,46 @@ static struct v4l2_subscribed_event *v4l2_event_subscribed(
assert_spin_locked(&fh->vdev->fh_lock);
list_for_each_entry(sev, &events->subscribed, list) {
- if (sev->type == type)
+ if (sev->type == type && sev->id == id)
return sev;
}
return NULL;
}
+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;
+
+ /* Are we subscribed? */
+ sev = v4l2_event_subscribed(fh, ev->type, ev->id);
+ if (sev == NULL)
+ return;
+
+ /* Increase event sequence number on fh. */
+ events->sequence++;
+
+ /* Do we have any free events? */
+ if (list_empty(&events->free))
+ return;
+
+ /* 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.id = ev->id;
+ kev->event.timestamp = *ts;
+ kev->event.sequence = events->sequence;
+ list_move_tail(&kev->list, &events->available);
+
+ events->navailable++;
+
+ wake_up_all(&events->wait);
+}
+
void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev)
{
struct v4l2_fh *fh;
@@ -182,37 +218,26 @@ void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev)
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);
+ __v4l2_event_queue_fh(fh, ev, ×tamp);
}
spin_unlock_irqrestore(&vdev->fh_lock, flags);
}
EXPORT_SYMBOL_GPL(v4l2_event_queue);
+void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev)
+{
+ unsigned long flags;
+ struct timespec timestamp;
+
+ ktime_get_ts(×tamp);
+
+ spin_lock_irqsave(&fh->vdev->fh_lock, flags);
+ __v4l2_event_queue_fh(fh, ev, ×tamp);
+ spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
+}
+EXPORT_SYMBOL_GPL(v4l2_event_queue_fh);
+
int v4l2_event_pending(struct v4l2_fh *fh)
{
return fh->events->navailable;
@@ -223,7 +248,9 @@ int v4l2_event_subscribe(struct v4l2_fh *fh,
struct v4l2_event_subscription *sub)
{
struct v4l2_events *events = fh->events;
- struct v4l2_subscribed_event *sev;
+ 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) {
@@ -231,15 +258,31 @@ int v4l2_event_subscribe(struct v4l2_fh *fh,
return -ENOMEM;
}
+ if (sub->type == V4L2_EVENT_CTRL) {
+ ctrl = v4l2_ctrl_find(fh->ctrl_handler, sub->id);
+ if (ctrl == NULL)
+ return -EINVAL;
+ }
+
sev = kmalloc(sizeof(*sev), GFP_KERNEL);
if (!sev)
return -ENOMEM;
+ if (ctrl) {
+ ctrl_fh = kzalloc(sizeof(*ctrl_fh), GFP_KERNEL);
+ if (!ctrl_fh) {
+ kfree(sev);
+ return -ENOMEM;
+ }
+ ctrl_fh->fh = fh;
+ }
spin_lock_irqsave(&fh->vdev->fh_lock, flags);
- if (v4l2_event_subscribed(fh, sub->type) == NULL) {
+ found_ev = v4l2_event_subscribed(fh, sub->type, sub->id);
+ if (!found_ev) {
INIT_LIST_HEAD(&sev->list);
sev->type = sub->type;
+ sev->id = sub->id;
list_add(&sev->list, &events->subscribed);
sev = NULL;
@@ -247,6 +290,10 @@ int v4l2_event_subscribe(struct v4l2_fh *fh,
spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
+ /* v4l2_ctrl_add_fh uses a mutex, so do this outside the spin lock */
+ if (!found_ev && ctrl)
+ v4l2_ctrl_add_fh(fh->ctrl_handler, ctrl_fh, sub);
+
kfree(sev);
return 0;
@@ -256,6 +303,7 @@ 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;
@@ -265,11 +313,13 @@ static void v4l2_event_unsubscribe_all(struct v4l2_fh *fh)
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);
+ struct v4l2_subscribed_event, list);
+ sub.type = sev->type;
+ sub.id = sev->id;
}
spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
- kfree(sev);
+ if (sev)
+ v4l2_event_unsubscribe(fh, &sub);
} while (sev);
}
@@ -286,11 +336,17 @@ int v4l2_event_unsubscribe(struct v4l2_fh *fh,
spin_lock_irqsave(&fh->vdev->fh_lock, flags);
- sev = v4l2_event_subscribed(fh, sub->type);
+ sev = v4l2_event_subscribed(fh, sub->type, sub->id);
if (sev != NULL)
list_del(&sev->list);
spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
+ if (sev->type == V4L2_EVENT_CTRL) {
+ struct v4l2_ctrl *ctrl = v4l2_ctrl_find(fh->ctrl_handler, sev->id);
+
+ if (ctrl)
+ v4l2_ctrl_del_fh(ctrl, fh);
+ }
kfree(sev);
@@ -93,10 +93,8 @@ void v4l2_fh_exit(struct v4l2_fh *fh)
{
if (fh->vdev == NULL)
return;
-
- fh->vdev = NULL;
-
v4l2_event_free(fh);
+ fh->vdev = NULL;
}
EXPORT_SYMBOL_GPL(v4l2_fh_exit);
@@ -1792,6 +1792,7 @@ struct v4l2_streamparm {
#define V4L2_EVENT_ALL 0
#define V4L2_EVENT_VSYNC 1
#define V4L2_EVENT_EOS 2
+#define V4L2_EVENT_CTRL 3
#define V4L2_EVENT_PRIVATE_START 0x08000000
/* Payload for V4L2_EVENT_VSYNC */
@@ -1800,21 +1801,45 @@ struct v4l2_event_vsync {
__u8 field;
} __attribute__ ((packed));
+/* Payload for V4L2_EVENT_CTRL */
+#define V4L2_EVENT_CTRL_CH_VALUE (1 << 0)
+#define V4L2_EVENT_CTRL_CH_FLAGS (1 << 1)
+
+struct v4l2_event_ctrl {
+ __u32 changes;
+ __u32 type;
+ union {
+ __s32 value;
+ __s64 value64;
+ };
+ __u32 flags;
+ __s32 minimum;
+ __s32 maximum;
+ __s32 step;
+ __s32 default_value;
+} __attribute__ ((packed));
+
struct v4l2_event {
__u32 type;
union {
struct v4l2_event_vsync vsync;
+ struct v4l2_event_ctrl ctrl;
__u8 data[64];
} u;
__u32 pending;
__u32 sequence;
struct timespec timestamp;
- __u32 reserved[9];
+ __u32 id;
+ __u32 reserved[8];
};
+#define V4L2_EVENT_SUB_FL_SEND_INITIAL (1 << 0)
+
struct v4l2_event_subscription {
__u32 type;
- __u32 reserved[7];
+ __u32 id;
+ __u32 flags;
+ __u32 reserved[5];
};
/*
@@ -28,9 +28,10 @@
/* forward references */
struct v4l2_ctrl_handler;
struct v4l2_ctrl;
-struct v4l2_fh;
struct video_device;
struct v4l2_subdev;
+struct v4l2_event_subscription;
+struct v4l2_fh;
/** struct v4l2_ctrl_ops - The control operations that the driver has to provide.
* @g_volatile_ctrl: Get a new value for this control. Generally only relevant
@@ -98,6 +99,7 @@ struct v4l2_ctrl_ops {
struct v4l2_ctrl {
/* Administrative fields */
struct list_head node;
+ struct list_head fhs;
struct v4l2_ctrl_handler *handler;
struct v4l2_ctrl **cluster;
unsigned ncontrols;
@@ -169,6 +171,11 @@ struct v4l2_ctrl_handler {
int error;
};
+struct v4l2_ctrl_fh {
+ struct list_head node;
+ struct v4l2_fh *fh;
+};
+
/** struct v4l2_ctrl_config - Control configuration structure.
* @ops: The control ops.
* @id: The control ID.
@@ -379,6 +386,7 @@ struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id);
* @set_flags: Set these flags.
*
* This clears and sets flags. Does nothing if @ctrl == NULL.
+ * The V4L2_EVENT_CTRL event will be generated afterwards.
*
* This function expects that the control handler is locked.
*/
@@ -390,6 +398,7 @@ void v4l2_ctrl_flags(struct v4l2_ctrl *ctrl, u32 clear_flags, u32 set_flags);
* @set_flags: Set these flags.
*
* This clears and sets flags. Does nothing if @ctrl == NULL.
+ * The V4L2_EVENT_CTRL event will be generated afterwards.
*
* This function expects that the control handler is unlocked and will lock
* it before changing flags.
@@ -437,6 +446,11 @@ s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
*/
int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
+void v4l2_ctrl_add_fh(struct v4l2_ctrl_handler *hdl,
+ struct v4l2_ctrl_fh *ctrl_fh,
+ struct v4l2_event_subscription *sub);
+void v4l2_ctrl_del_fh(struct v4l2_ctrl *ctrl, struct v4l2_fh *fh);
+
/* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */
int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc);
int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm);
@@ -40,6 +40,7 @@ struct v4l2_kevent {
struct v4l2_subscribed_event {
struct list_head list;
u32 type;
+ u32 id;
};
struct v4l2_events {
@@ -58,6 +59,7 @@ void v4l2_event_free(struct v4l2_fh *fh);
int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
int nonblocking);
void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev);
+void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev);
int v4l2_event_pending(struct v4l2_fh *fh);
int v4l2_event_subscribe(struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);