parport_write — write a block of data to a parallel port
ssize_t parport_write ( | struct parport * port, |
| const void * buffer, | |
size_t len); |
portport to write to
bufferdata buffer (in kernel space)
lennumber of bytes of data to transfer
This will write up to len bytes of buffer to the port
specified, using the IEEE 1284 transfer mode most recently
negotiated to (using parport_negotiate), as long as that
mode supports forward transfers (host to peripheral).
It is the caller's responsibility to ensure that the first
len bytes of buffer are valid.
This function returns the number of bytes transferred (if zero or positive), or else an error code.