SYNOPSIS

struct v4l2_ctrl_ops {
int (* g_volatile_ctrl) (struct v4l2_ctrl *ctrl);
int (* try_ctrl) (struct v4l2_ctrl *ctrl);
int (* s_ctrl) (struct v4l2_ctrl *ctrl);
};

MEMBERS

g_volatile_ctrl

Get a new value for this control. Generally only relevant for volatile (and usually read-only) controls such as a control that returns the current signal strength which changes continuously. If not set, then the currently cached value will be returned.

try_ctrl

Test whether the control's value is valid. Only relevant when the usual min/max/step checks are not sufficient.

s_ctrl

Actually set the new control value. s_ctrl is compulsory. The ctrl->handler->lock is held when these ops are called, so no one else can access controls owned by that handler.

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