linux/drivers/parport/ieee1284_ops.c

// SPDX-License-Identifier: GPL-2.0
/* IEEE-1284 operations for parport.
 *
 * This file is for generic IEEE 1284 operations.  The idea is that
 * they are used by the low-level drivers.  If they have a special way
 * of doing something, they can provide their own routines (and put
 * the function pointers in port->ops); if not, they can just use these
 * as a fallback.
 *
 * Note: Make no assumptions about hardware or architecture in this file!
 *
 * Author: Tim Waugh <[email protected]>
 * Fixed AUTOFD polarity in ecp_forward_to_reverse().  Fred Barnes, 1999
 * Software emulated EPP fixes, Fred Barnes, 04/2001.
 */


#include <linux/module.h>
#include <linux/parport.h>
#include <linux/delay.h>
#include <linux/sched/signal.h>
#include <linux/uaccess.h>

#undef DEBUG /* undef me for production */

#ifdef CONFIG_LP_CONSOLE
#undef DEBUG /* Don't want a garbled console */
#endif

/***                                *
 * One-way data transfer functions. *
 *                                ***/

/* Compatibility mode. */
size_t parport_ieee1284_write_compat (struct parport *port,
				      const void *buffer, size_t len,
				      int flags)
{ … }

/* Nibble mode. */
size_t parport_ieee1284_read_nibble (struct parport *port, 
				     void *buffer, size_t len,
				     int flags)
{ … }

/* Byte mode. */
size_t parport_ieee1284_read_byte (struct parport *port,
				   void *buffer, size_t len,
				   int flags)
{ … }

/***              *
 * ECP Functions. *
 *              ***/

#ifdef CONFIG_PARPORT_1284

static inline
int ecp_forward_to_reverse (struct parport *port)
{ … }

static inline
int ecp_reverse_to_forward (struct parport *port)
{ … }

#endif /* IEEE1284 support */

/* ECP mode, forward channel, data. */
size_t parport_ieee1284_ecp_write_data (struct parport *port,
					const void *buffer, size_t len,
					int flags)
{ … }

/* ECP mode, reverse channel, data. */
size_t parport_ieee1284_ecp_read_data (struct parport *port,
				       void *buffer, size_t len, int flags)
{ … }

/* ECP mode, forward channel, commands. */
size_t parport_ieee1284_ecp_write_addr (struct parport *port,
					const void *buffer, size_t len,
					int flags)
{ … }

/***              *
 * EPP functions. *
 *              ***/

/* EPP mode, forward channel, data. */
size_t parport_ieee1284_epp_write_data (struct parport *port,
					const void *buffer, size_t len,
					int flags)
{ … }

/* EPP mode, reverse channel, data. */
size_t parport_ieee1284_epp_read_data (struct parport *port,
				       void *buffer, size_t len,
				       int flags)
{ … }

/* EPP mode, forward channel, addresses. */
size_t parport_ieee1284_epp_write_addr (struct parport *port,
					const void *buffer, size_t len,
					int flags)
{ … }

/* EPP mode, reverse channel, addresses. */
size_t parport_ieee1284_epp_read_addr (struct parport *port,
				       void *buffer, size_t len,
				       int flags)
{ … }

EXPORT_SYMBOL(…);
EXPORT_SYMBOL(…);
EXPORT_SYMBOL(…);
EXPORT_SYMBOL(…);
EXPORT_SYMBOL(…);
EXPORT_SYMBOL(…);
EXPORT_SYMBOL(…);
EXPORT_SYMBOL(…);
EXPORT_SYMBOL(…);
EXPORT_SYMBOL(…);