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[media] uvcvideo: Send control change events for slave ctrls when the master changes

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This allows v4l2 control UI-s to update the inactive state (ie grey-ing
out of controls) for slave controls when the master control changes.

[Use __uvc_find_control() to find slave controls, as they're always
located in the same entity as the corresponding master control]

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans de Goede 2012-04-08 12:59:53 -03:00 committed by Mauro Carvalho Chehab
parent 55afeb8a4d
commit 805e9b4a06
1 changed files with 56 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/media/video/uvc/uvc_ctrl.c
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@ -1177,22 +1177,76 @@ static void uvc_ctrl_send_event(struct uvc_fh *handle,
list_for_each_entry(sev, &mapping->ev_subs, node) {
if (sev->fh && (sev->fh != &handle->vfh ||
(sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK)))
(sev->flags & V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK) ||
(changes & V4L2_EVENT_CTRL_CH_FLAGS)))
v4l2_event_queue_fh(sev->fh, &ev);
}
}
static void uvc_ctrl_send_slave_event(struct uvc_fh *handle,
struct uvc_control *master, u32 slave_id,
const struct v4l2_ext_control *xctrls, unsigned int xctrls_count)
{
struct uvc_control_mapping *mapping = NULL;
struct uvc_control *ctrl = NULL;
u32 changes = V4L2_EVENT_CTRL_CH_FLAGS;
unsigned int i;
s32 val = 0;
/*
* We can skip sending an event for the slave if the slave
* is being modified in the same transaction.
*/
for (i = 0; i < xctrls_count; i++) {
if (xctrls[i].id == slave_id)
return;
}
__uvc_find_control(master->entity, slave_id, &mapping, &ctrl, 0);
if (ctrl == NULL)
return;
if (__uvc_ctrl_get(handle->chain, ctrl, mapping, &val) == 0)
changes |= V4L2_EVENT_CTRL_CH_VALUE;
uvc_ctrl_send_event(handle, ctrl, mapping, val, changes);
}
static void uvc_ctrl_send_events(struct uvc_fh *handle,
const struct v4l2_ext_control *xctrls, unsigned int xctrls_count)
{
struct uvc_control_mapping *mapping;
struct uvc_control *ctrl;
u32 changes = V4L2_EVENT_CTRL_CH_VALUE;
unsigned int i;
unsigned int j;
for (i = 0; i < xctrls_count; ++i) {
ctrl = uvc_find_control(handle->chain, xctrls[i].id, &mapping);
for (j = 0; j < ARRAY_SIZE(mapping->slave_ids); ++j) {
if (!mapping->slave_ids[j])
break;
uvc_ctrl_send_slave_event(handle, ctrl,
mapping->slave_ids[j],
xctrls, xctrls_count);
}
/*
* If the master is being modified in the same transaction
* flags may change too.
*/
if (mapping->master_id) {
for (j = 0; j < xctrls_count; j++) {
if (xctrls[j].id == mapping->master_id) {
changes |= V4L2_EVENT_CTRL_CH_FLAGS;
break;
}
}
}
uvc_ctrl_send_event(handle, ctrl, mapping, xctrls[i].value,
V4L2_EVENT_CTRL_CH_VALUE);
changes);
}
}