PARPORT_READ(9)                       Parallel Port Devices                       PARPORT_READ(9)



NAME
       parport_read - read a block of data from a parallel port

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

ARGUMENTS
       port
           port to read from

       buffer
           data buffer (in kernel space)

       len
           number of bytes of data to transfer

DESCRIPTION
       This will read 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 reverse transfers (peripheral to host).

       It is the caller's responsibility to ensure that the first len bytes of buffer are
       available to write to.

       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_READ(9)