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media: subdev: Add v4l2_subdev_is_streaming()

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Add a helper function which returns whether the subdevice is streaming,
i.e. if .s_stream or .enable_streams has been called successfully.

Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Tomi Valkeinen 2024-04-24 18:39:09 +03:00 committed by Hans Verkuil
parent 61d6c8c896
commit 5f3ce14fae
2 changed files with 38 additions and 0 deletions
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25
drivers/media/v4l2-core/v4l2-subdev.c
View File

@ -2474,6 +2474,31 @@ void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
}
EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);
bool v4l2_subdev_is_streaming(struct v4l2_subdev *sd)
{
struct v4l2_subdev_state *state;
if (!v4l2_subdev_has_op(sd, pad, enable_streams))
return sd->s_stream_enabled;
if (!(sd->flags & V4L2_SUBDEV_FL_STREAMS))
return !!sd->enabled_pads;
state = v4l2_subdev_get_locked_active_state(sd);
for (unsigned int i = 0; i < state->stream_configs.num_configs; ++i) {
const struct v4l2_subdev_stream_config *cfg;
cfg = &state->stream_configs.configs[i];
if (cfg->enabled)
return true;
}
return false;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_is_streaming);
int v4l2_subdev_get_privacy_led(struct v4l2_subdev *sd)
{
#if IS_REACHABLE(CONFIG_LEDS_CLASS)

13
include/media/v4l2-subdev.h
View File

@ -1956,4 +1956,17 @@ extern const struct v4l2_subdev_ops v4l2_subdev_call_wrappers;
void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
const struct v4l2_event *ev);
/**
* v4l2_subdev_is_streaming() - Returns if the subdevice is streaming
* @sd: The subdevice
*
* v4l2_subdev_is_streaming() tells if the subdevice is currently streaming.
* "Streaming" here means whether .s_stream() or .enable_streams() has been
* successfully called, and the streaming has not yet been disabled.
*
* If the subdevice implements .enable_streams() this function must be called
* while holding the active state lock.
*/
bool v4l2_subdev_is_streaming(struct v4l2_subdev *sd);
#endif /* _V4L2_SUBDEV_H */