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 callerīs 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.