SYNOPSIS

int v4l2_pipeline_pm_use(struct media_entity * entity, int use);

ARGUMENTS

entity

The entity

use

Use (1) or stop using (0) the entity

DESCRIPTION

Update the use count of all entities in the pipeline and power entities on or off accordingly.

This function is intended to be called in video node open (use == 1) and release (use == 0). It uses struct media_entity.use_count to track the power status. The use of this function should be paired with v4l2_pipeline_link_notify.

Return 0 on success or a negative error code on failure. Powering entities off is assumed to never fail. No failure can occur when the use parameter is set to 0.

COPYRIGHT