PARPORT_WRITE(9)                      Parallel Port Devices                      PARPORT_WRITE(9)



NAME
       parport_write - write a block of data to a parallel port

SYNOPSIS
       ssize_t parport_write(struct parport * port, const void * buffer, size_t len);

ARGUMENTS
       port
           port to write to

       buffer
           data buffer (in kernel space)

       len
           number of bytes of data to transfer

DESCRIPTION
       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.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                          PARPORT_WRITE(9)