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CentOS 7.0 - man page for ieee1284_ecp_rev_to_fwd (centos section 3)

IEEE1284_ECP_FWD_TO_(3) 			      Functions 			      IEEE1284_ECP_FWD_TO_(3)

NAME
ieee1284_ecp_fwd_to_rev, ieee1284_ecp_rev_to_fwd - ECP direction switching
SYNOPSIS
int ieee1284_ecp_fwd_to_rev(struct parport *port); int ieee1284_ecp_rev_to_fwd(struct parport *port);
DESCRIPTION
These functions are used to switch directions when in ECP mode. On negotiation to ECP mode the direction is forward (in other words, host-to-peripheral). Use ieee1284_ecp_fwd_to_rev to switch from forward to reverse, and ieee1284_ecp_rev_to_fwd to switch from reverse to forward. They act on the parallel port associated with port, which must be claimed.
RETURN VALUE
E1284_OK Direction switched successfully. E1284_NOTIMPL The port lacks the required capability. This could be due to a limitation of this version of libieee1284, or a hardware limitation. E1284_INVALIDPORT The port parameter is invalid (for instance, perhaps the port is not claimed).
AUTHOR
Tim Waugh <twaugh@redhat.com> Author.
COPYRIGHT
Copyright (C) 2001-2003 Tim Waugh [FIXME: source] 06/17/2014 IEEE1284_ECP_FWD_TO_(3)


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