patch-2.3.12 linux/drivers/misc/parport_ieee1284_ops.c

• Lines: 849
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.11/linux/drivers/misc/parport_ieee1284_ops.c
• Orig date: Thu Jul 8 15:42:20 1999

diff -u --recursive --new-file v2.3.11/linux/drivers/misc/parport_ieee1284_ops.c linux/drivers/misc/parport_ieee1284_ops.c
@@ -1,848 +0,0 @@
-/* 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 <tim@cyberelk.demon.co.uk>
- */
-
-#include <linux/config.h>
-#include <linux/parport.h>
-#include <linux/delay.h>
-#include <asm/uaccess.h>
-
-#define DEBUG /* undef me for production */
-
-#ifdef CONFIG_LP_CONSOLE
-#undef DEBUG /* Don't want a garbled console */
-#endif
-
-#ifdef DEBUG
-#define DPRINTK(stuff...) printk (stuff)
-#else
-#define DPRINTK(stuff...)
-#endif
-
-/***                                *
- * One-way data transfer functions. *
- *                                ***/
-
-static inline
-int polling (struct pardevice *dev)
-{
-	return dev->port->irq == PARPORT_IRQ_NONE;
-}
-
-/* Compatibility mode. */
-size_t parport_ieee1284_write_compat (struct parport *port,
-				      const void *buffer, size_t len,
-				      int flags)
-{
-	ssize_t count = 0;
-	const unsigned char *addr = buffer;
-	unsigned char byte;
-	struct pardevice *dev = port->physport->cad;
-	unsigned char ctl = (PARPORT_CONTROL_SELECT
-			     | PARPORT_CONTROL_INIT);
-
-	if (port->irq != PARPORT_IRQ_NONE)
-		parport_enable_irq (port);
-
-	port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;
-	while (count < len) {
-		long expire = jiffies + dev->timeout;
-		long wait = (HZ + 99) / 100;
-		unsigned char mask = (PARPORT_STATUS_ERROR
-				      | PARPORT_STATUS_BUSY);
-		unsigned char val = (PARPORT_STATUS_ERROR
-				     | PARPORT_STATUS_BUSY);
-		int i;
-
-		/* Write the character to the data lines. */
-		byte = *addr++;
-		parport_write_data (port, byte);
-		udelay (1);
-
-		/* Wait until the peripheral's ready */
-		do {
-			/* Is the peripheral ready yet? */
-			if (!parport_wait_peripheral (port, mask, val))
-				/* Skip the loop */
-				goto ready;
-
-			/* Is the peripheral upset? */
-			if ((parport_read_status (port) &
-			     (PARPORT_STATUS_PAPEROUT |
-			      PARPORT_STATUS_SELECT |
-			      PARPORT_STATUS_ERROR))
-			    != (PARPORT_STATUS_SELECT |
-				PARPORT_STATUS_ERROR))
-				/* If nFault is asserted (i.e. no
-				 * error) and PAPEROUT and SELECT are
-				 * just red herrings, give the driver
-				 * a chance to check it's happy with
-				 * that before continuing. */
-				goto stop;
-
-			/* Have we run out of time? */
-			if (!time_before (jiffies, expire))
-				break;
-
-			/* Yield the port for a while.  If this is the
-                           first time around the loop, don't let go of
-                           the port.  This way, we find out if we have
-                           our interrupt handler called. */
-			if (count && polling (dev)) {
-				parport_release (dev);
-				current->state = TASK_INTERRUPTIBLE;
-				schedule_timeout (wait);
-				parport_claim_or_block (dev);
-			}
-			else
-				/* We must have the device claimed here */
-				parport_wait_event (port, wait);
-
-			/* Is there a signal pending? */
-			if (signal_pending (current))
-				goto stop;
-
-			/* Wait longer next time. */
-			wait *= 2;
-		} while (time_before (jiffies, expire));
-
-		DPRINTK (KERN_DEBUG "%s: Timed out\n", port->name);
-		break;
-
-	ready:
-		/* Clear out previous irqs. */
-		while (!down_trylock (&port->physport->ieee1284.irq));
-
-		/* Pulse strobe. */
-		parport_write_control (port, ctl | PARPORT_CONTROL_STROBE);
-		udelay (1); /* strobe */
-
-		parport_write_control (port, ctl);
-		udelay (1); /* hold */
-
-		/* Wait until it's received (up to 20us). */
-		for (i = 0; i < 20; i++) {
-			if (!down_trylock (&port->physport->ieee1284.irq) ||
-			    !(parport_read_status (port) & PARPORT_STATUS_ACK))
-				break;
-			udelay (1);
-		}
-
-		count++;
-
-                /* Let another process run if it needs to. */
-		if (time_before (jiffies, expire))
-			if (!parport_yield_blocking (dev)
-			    && current->need_resched)
-				schedule ();
-	}
- stop:
-	port->physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
-
-	return count;
-}
-
-/* Nibble mode. */
-size_t parport_ieee1284_read_nibble (struct parport *port, 
-				     void *buffer, size_t len,
-				     int flags)
-{
-#ifndef CONFIG_PARPORT_1284
-	return 0;
-#else
-	unsigned char *buf = buffer;
-	int i;
-	unsigned char byte = 0;
-
-	len *= 2; /* in nibbles */
-	for (i=0; i < len; i++) {
-		unsigned char nibble;
-
-		/* Does the error line indicate end of data? */
-		if (((i & 1) == 0) &&
-		    (parport_read_status(port) & PARPORT_STATUS_ERROR)) {
-			port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DNA;
-			DPRINTK (KERN_DEBUG
-				"%s: No more nibble data (%d bytes)\n",
-				port->name, i/2);
-
-			/* Go to reverse idle phase. */
-			parport_frob_control (port,
-					      PARPORT_CONTROL_AUTOFD,
-					      PARPORT_CONTROL_AUTOFD);
-			port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
-			break;
-		}
-
-		/* Event 7: Set nAutoFd low. */
-		parport_frob_control (port,
-				      PARPORT_CONTROL_AUTOFD,
-				      PARPORT_CONTROL_AUTOFD);
-
-		/* Event 9: nAck goes low. */
-		port->ieee1284.phase = IEEE1284_PH_REV_DATA;
-		if (parport_wait_peripheral (port,
-					     PARPORT_STATUS_ACK, 0)) {
-			/* Timeout -- no more data? */
-			DPRINTK (KERN_DEBUG
-				 "%s: Nibble timeout at event 9 (%d bytes)\n",
-				 port->name, i/2);
-			break;
-		}
-
-
-		/* Read a nibble. */
-		nibble = parport_read_status (port) >> 3;
-		nibble &= ~8;
-		if ((nibble & 0x10) == 0)
-			nibble |= 8;
-		nibble &= 0xf;
-
-		/* Event 10: Set nAutoFd high. */
-		parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
-
-		/* Event 11: nAck goes high. */
-		if (parport_wait_peripheral (port,
-					     PARPORT_STATUS_ACK,
-					     PARPORT_STATUS_ACK)) {
-			/* Timeout -- no more data? */
-			DPRINTK (KERN_DEBUG
-				 "%s: Nibble timeout at event 11\n",
-				 port->name);
-			break;
-		}
-
-		if (i & 1) {
-			/* Second nibble */
-			byte |= nibble << 4;
-			*buf++ = byte;
-		} else 
-			byte = nibble;
-	}
-
-	i /= 2; /* i is now in bytes */
-
-	if (i == len) {
-		/* Read the last nibble without checking data avail. */
-		port = port->physport;
-		if (parport_read_status (port) & PARPORT_STATUS_ERROR)
-			port->ieee1284.phase = IEEE1284_PH_HBUSY_DNA;
-		else
-			port->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
-	}
-
-	return i;
-#endif /* IEEE1284 support */
-}
-
-/* Byte mode. */
-size_t parport_ieee1284_read_byte (struct parport *port,
-				   void *buffer, size_t len,
-				   int flags)
-{
-#ifndef CONFIG_PARPORT_1284
-	return 0;
-#else
-	unsigned char *buf = buffer;
-	ssize_t count = 0;
-
-	for (count = 0; count < len; count++) {
-		unsigned char byte;
-
-		/* Data available? */
-		if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
-			port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DNA;
-			DPRINTK (KERN_DEBUG
-				 "%s: No more byte data (%d bytes)\n",
-				 port->name, count);
-
-			/* Go to reverse idle phase. */
-			parport_frob_control (port,
-					      PARPORT_CONTROL_AUTOFD,
-					      PARPORT_CONTROL_AUTOFD);
-			port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
-			break;
-		}
-
-		/* Event 7: Set nAutoFd low. */
-		parport_frob_control (port,
-				      PARPORT_CONTROL_AUTOFD,
-				      PARPORT_CONTROL_AUTOFD);
-
-		/* Event 9: nAck goes low. */
-		port->physport->ieee1284.phase = IEEE1284_PH_REV_DATA;
-		if (parport_wait_peripheral (port,
-					     PARPORT_STATUS_ACK,
-					     0)) {
-			/* Timeout -- no more data? */
-			parport_frob_control (port, PARPORT_CONTROL_AUTOFD,
-						 0);
-			DPRINTK (KERN_DEBUG "%s: Byte timeout at event 9\n",
-				 port->name);
-			break;
-		}
-
-		byte = parport_read_data (port);
-		*buf++ = byte;
-
-		/* Event 10: Set nAutoFd high */
-		parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
-
-		/* Event 11: nAck goes high. */
-		if (parport_wait_peripheral (port,
-					     PARPORT_STATUS_ACK,
-					     PARPORT_STATUS_ACK)) {
-			/* Timeout -- no more data? */
-			DPRINTK (KERN_DEBUG "%s: Byte timeout at event 11\n",
-				 port->name);
-			break;
-		}
-
-		/* Event 16: Set nStrobe low. */
-		parport_frob_control (port,
-				      PARPORT_CONTROL_STROBE,
-				      PARPORT_CONTROL_STROBE);
-		udelay (5);
-
-		/* Event 17: Set nStrobe high. */
-		parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
-	}
-
-	if (count == len) {
-		/* Read the last byte without checking data avail. */
-		port = port->physport;
-		if (parport_read_status (port) & PARPORT_STATUS_ERROR)
-			port->ieee1284.phase = IEEE1284_PH_HBUSY_DNA;
-		else
-			port->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
-	}
-
-	return count;
-#endif /* IEEE1284 support */
-}
-
-/***              *
- * ECP Functions. *
- *              ***/
-
-#ifdef CONFIG_PARPORT_1284
-
-static inline
-int ecp_forward_to_reverse (struct parport *port)
-{
-	int retval;
-
-	/* Event 38: Set nAutoFd low */
-	parport_frob_control (port,
-			      PARPORT_CONTROL_AUTOFD,
-			      PARPORT_CONTROL_AUTOFD);
-	parport_data_reverse (port);
-	udelay (5);
-
-	/* Event 39: Set nInit low to initiate bus reversal */
-	parport_frob_control (port,
-			      PARPORT_CONTROL_INIT,
-			      PARPORT_CONTROL_INIT);
-
-	/* Event 40: PError goes low */
-	retval = parport_wait_peripheral (port,
-					  PARPORT_STATUS_PAPEROUT, 0);
-
-	if (!retval) {
-		DPRINTK (KERN_DEBUG "%s: ECP direction: reverse\n",
-			 port->name);
-		port->ieee1284.phase = IEEE1284_PH_REV_IDLE;
-	}
-
-	return retval;
-}
-
-static inline
-int ecp_reverse_to_forward (struct parport *port)
-{
-	int retval;
-
-	/* Event 47: Set nInit high */
-	parport_frob_control (port,
-			      PARPORT_CONTROL_INIT,
-			      PARPORT_CONTROL_INIT);
-	parport_data_reverse (port);
-
-	/* Event 49: PError goes high */
-	retval = parport_wait_peripheral (port,
-					  PARPORT_STATUS_PAPEROUT,
-					  PARPORT_STATUS_PAPEROUT);
-
-	if (!retval) {
-		parport_data_forward (port);
-		DPRINTK (KERN_DEBUG "%s: ECP direction: forward\n",
-			 port->name);
-		port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
-	}
-
-	return retval;
-}
-
-#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)
-{
-#ifndef CONFIG_PARPORT_1284
-	return 0;
-#else
-	const unsigned char *buf = buffer;
-	size_t written;
-	int ctl = parport_read_control (port) & ~PARPORT_CONTROL_AUTOFD;
-	int retry;
-
-	port = port->physport;
-
-	if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE)
-		if (ecp_reverse_to_forward (port))
-			return 0;
-
-	port->ieee1284.phase = IEEE1284_PH_FWD_DATA;
-
-	/* HostAck high (data, not command) */
-	parport_write_control (port, ctl);
-	for (written = 0; written < len; written++, buf++) {
-		long expire = jiffies + port->cad->timeout;
-		unsigned char byte;
-
-		byte = *buf;
-	try_again:
-		parport_write_data (port, byte);
-		parport_write_control (port, ctl | PARPORT_CONTROL_STROBE);
-		udelay (5);
-		for (retry = 0; retry < 100; retry++) {
-			if (!parport_wait_peripheral (port,
-						      PARPORT_STATUS_BUSY, 0))
-				goto success;
-
-			if (signal_pending (current)) {
-				parport_write_control (port, ctl);
-				break;
-			}
-		}
-
-		/* Time for Host Transfer Recovery (page 41 of IEEE1284) */
-		DPRINTK (KERN_DEBUG "%s: ECP transfer stalled!\n", port->name);
-
-		parport_write_control (port, ctl | PARPORT_CONTROL_INIT);
-		udelay (50);
-		if (parport_read_status (port) & PARPORT_STATUS_PAPEROUT) {
-			/* It's buggered. */
-			parport_write_control (port, ctl);
-			break;
-		}
-
-		parport_write_control (port, ctl);
-		udelay (50);
-		if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT))
-			break;
-
-		DPRINTK (KERN_DEBUG "%s: Host transfer recovered\n",
-			 port->name);
-
-		if (time_after_eq (jiffies, expire)) break;
-		goto try_again;
-	success:
-		parport_write_control (port, ctl);
-		udelay (5);
-		if (parport_wait_peripheral (port,
-					     PARPORT_STATUS_BUSY,
-					     PARPORT_STATUS_BUSY))
-			/* Peripheral hasn't accepted the data. */
-			break;
-	}
-
-	port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
-
-	return written;
-#endif /* IEEE1284 support */
-}
-
-/* ECP mode, reverse channel, data. */
-size_t parport_ieee1284_ecp_read_data (struct parport *port,
-				       void *buffer, size_t len, int flags)
-{
-#ifndef CONFIG_PARPORT_1284
-	return 0;
-#else
-	struct pardevice *dev = port->cad;
-	unsigned char *buf = buffer;
-	int rle_count = 0; /* shut gcc up */
-	int rle = 0;
-	ssize_t count = 0;
-
-	port = port->physport;
-
-	if (port->ieee1284.phase != IEEE1284_PH_REV_IDLE)
-		if (ecp_forward_to_reverse (port))
-			return 0;
-
-	port->ieee1284.phase = IEEE1284_PH_REV_DATA;
-
-	/* Set HostAck low to start accepting data. */
-	parport_frob_control (port, PARPORT_CONTROL_AUTOFD,
-			      PARPORT_CONTROL_AUTOFD);
-	while (count < len) {
-		long expire = jiffies + dev->timeout;
-		unsigned char byte;
-		int command;
-
-		/* Event 43: Peripheral sets nAck low. It can take as
-                   long as it wants. */
-		while (parport_wait_peripheral (port,
-						PARPORT_STATUS_ACK,
-						PARPORT_STATUS_ACK)) {
-			/* The peripheral hasn't given us data in
-			   35ms.  If we have data to give back to the
-			   caller, do it now. */
-			if (count)
-				goto out;
-
-			/* If we've used up all the time we were allowed,
-			   give up altogether. */
-			if (!time_before (jiffies, expire))
-				goto out;
-
-			/* Yield the port for a while. */
-			if (count && polling (dev)) {
-				parport_release (dev);
-				current->state = TASK_INTERRUPTIBLE;
-				schedule_timeout ((HZ + 99) / 25);
-				parport_claim_or_block (dev);
-			}
-			else
-				/* We must have the device claimed here. */
-				parport_wait_event (port, (HZ + 99) / 25);
-
-			/* Is there a signal pending? */
-			if (signal_pending (current))
-				goto out;
-		}
-
-		/* Is this a command? */
-		if (rle)
-			/* The last byte was a run-length count, so
-                           this can't be as well. */
-			command = 0;
-		else
-			command = (parport_read_status (port) &
-				   PARPORT_STATUS_BUSY) ? 1 : 0;
-
-		/* Read the data. */
-		byte = parport_read_data (port);
-
-		/* If this is a channel command, rather than an RLE
-                   command or a normal data byte, don't accept it. */
-		if (command) {
-			if (byte & 0x80) {
-				DPRINTK (KERN_DEBUG "%s: stopping short at "
-					 "channel command (%02x)\n",
-					 port->name, byte);
-				goto out;
-			}
-			else if (port->ieee1284.mode != IEEE1284_MODE_ECPRLE)
-				DPRINTK (KERN_DEBUG "%s: device illegally "
-					 "using RLE; accepting anyway\n",
-					 port->name);
-
-			rle_count = byte + 1;
-
-			/* Are we allowed to read that many bytes? */
-			if (rle_count > (len - count)) {
-				DPRINTK (KERN_DEBUG "%s: leaving %d RLE bytes "
-					 "for next time\n", port->name,
-					 rle_count);
-				break;
-			}
-
-			rle = 1;
-		}
-
-		/* Event 44: Set HostAck high, acknowledging handshake. */
-		parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
-
-		/* Event 45: The peripheral has 35ms to set nAck high. */
-		if (parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0)) {
-			/* It's gone wrong.  Return what data we have
-                           to the caller. */
-			DPRINTK (KERN_DEBUG "ECP read timed out at 45\n");
-
-			if (command)
-				printk (KERN_WARNING
-					"%s: command ignored (%02x)\n",
-					port->name, byte);
-
-			break;
-		}
-
-		/* Event 46: Set HostAck low and accept the data. */
-		parport_frob_control (port,
-				      PARPORT_CONTROL_AUTOFD,
-				      PARPORT_CONTROL_AUTOFD);
-
-		/* If we just read a run-length count, fetch the data. */
-		if (command)
-			continue;
-
-		/* If this is the byte after a run-length count, decompress. */
-		if (rle) {
-			rle = 0;
-			memset (buf, byte, rle_count);
-			buf += rle_count;
-			count += rle_count;
-			DPRINTK (KERN_DEBUG "%s: decompressed to %d bytes\n",
-				 port->name, rle_count);
-		}
-		else
-			/* Normal data byte. */
-			*buf++ = byte, count++;
-	}
-
- out:
-	return count;
-#endif /* IEEE1284 support */
-}
-
-/* ECP mode, forward channel, commands. */
-size_t parport_ieee1284_ecp_write_addr (struct parport *port,
-					const void *buffer, size_t len,
-					int flags)
-{
-#ifndef CONFIG_PARPORT_1284
-	return 0;
-#else
-	const unsigned char *buf = buffer;
-	size_t written;
-	int ctl = parport_read_control (port) | PARPORT_CONTROL_AUTOFD;
-	int retry;
-
-	port = port->physport;
-
-	if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE)
-		if (ecp_reverse_to_forward (port))
-			return 0;
-
-	port->ieee1284.phase = IEEE1284_PH_FWD_DATA;
-
-	/* HostAck low (command, not data) */
-	parport_write_control (port, ctl);
-	for (written = 0; written < len; written++, buf++) {
-		long expire = jiffies + port->cad->timeout;
-		unsigned char byte;
-
-		byte = *buf;
-	try_again:
-		parport_write_data (port, byte);
-		parport_write_control (port, ctl | PARPORT_CONTROL_STROBE);
-		udelay (5);
-		for (retry = 0; retry < 100; retry++) {
-			if (!parport_wait_peripheral (port,
-						      PARPORT_STATUS_BUSY, 0))
-				goto success;
-
-			if (signal_pending (current)) {
-				parport_write_control (port, ctl);
-				break;
-			}
-		}
-
-		/* Time for Host Transfer Recovery (page 41 of IEEE1284) */
-		DPRINTK (KERN_DEBUG "%s: ECP transfer stalled!\n", port->name);
-
-		parport_write_control (port, ctl | PARPORT_CONTROL_INIT);
-		udelay (50);
-		if (parport_read_status (port) & PARPORT_STATUS_PAPEROUT) {
-			/* It's buggered. */
-			parport_write_control (port, ctl);
-			break;
-		}
-
-		parport_write_control (port, ctl);
-		udelay (50);
-		if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT))
-			break;
-
-		DPRINTK (KERN_DEBUG "%s: Host transfer recovered\n",
-			 port->name);
-
-		if (time_after_eq (jiffies, expire)) break;
-		goto try_again;
-	success:
-		parport_write_control (port, ctl);
-		udelay (5);
-		if (parport_wait_peripheral (port,
-					     PARPORT_STATUS_BUSY,
-					     PARPORT_STATUS_BUSY))
-			/* Peripheral hasn't accepted the data. */
-			break;
-	}
-
-	port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
-
-	return written;
-#endif /* IEEE1284 support */
-}
-
-/***              *
- * 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)
-{
-	/* This is untested */
-	unsigned char *bp = (unsigned char *) buffer;
-	size_t ret = 0;
-
-	parport_frob_control (port,
-			      PARPORT_CONTROL_STROBE |
-			      PARPORT_CONTROL_AUTOFD |
-			      PARPORT_CONTROL_SELECT,
-			      PARPORT_CONTROL_STROBE |
-			      PARPORT_CONTROL_SELECT);
-	port->ops->data_forward (port);
-	for (; len > 0; len--, bp++) {
-		parport_write_data (port, *bp);
-
-		if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY,
-					     PARPORT_STATUS_BUSY))
-			break;
-
-		/* Strobe data */
-		parport_frob_control (port, PARPORT_CONTROL_AUTOFD,
-				      PARPORT_CONTROL_AUTOFD);
-
-		if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0))
-			break;
-
-		parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
-		ret++;
-	}
-
-	return ret;
-}
-
-/* EPP mode, reverse channel, data. */
-size_t parport_ieee1284_epp_read_data (struct parport *port,
-				       void *buffer, size_t len,
-				       int flags)
-{
-	/* This is untested. */
-	unsigned char *bp = (unsigned char *) buffer;
-	unsigned ret = 0;
-
-	parport_frob_control (port,
-			      PARPORT_CONTROL_STROBE |
-			      PARPORT_CONTROL_AUTOFD |
-			      PARPORT_CONTROL_SELECT, 0);
-	port->ops->data_reverse (port);
-	for (; len > 0; len--, bp++) {
-		if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY,
-					     PARPORT_STATUS_BUSY))
-			break;
-
-		parport_frob_control (port, PARPORT_CONTROL_AUTOFD,
-				      PARPORT_CONTROL_AUTOFD);
-
-		if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0))
-			break;
-
-		*bp = parport_read_data (port);
-
-		parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
-		ret++;
-	}
-	port->ops->data_forward (port);
-
-	return ret;
-}
-
-/* EPP mode, forward channel, addresses. */
-size_t parport_ieee1284_epp_write_addr (struct parport *port,
-					const void *buffer, size_t len,
-					int flags)
-{
-	/* This is untested */
-	unsigned char *bp = (unsigned char *) buffer;
-	size_t ret = 0;
-
-	parport_frob_control (port,
-			      PARPORT_CONTROL_STROBE |
-			      PARPORT_CONTROL_SELECT |
-			      PARPORT_CONTROL_AUTOFD,
-			      PARPORT_CONTROL_STROBE |
-			      PARPORT_CONTROL_SELECT);
-	port->ops->data_forward (port);
-	for (; len > 0; len--, bp++) {
-		parport_write_data (port, *bp);
-
-		if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY,
-					     PARPORT_STATUS_BUSY))
-			break;
-
-		/* Strobe data */
-		parport_frob_control (port, PARPORT_CONTROL_SELECT,
-				      PARPORT_CONTROL_SELECT);
-
-		if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0))
-			break;
-
-		parport_frob_control (port, PARPORT_CONTROL_SELECT, 0);
-		ret++;
-	}
-
-	return ret;
-}
-
-/* EPP mode, reverse channel, addresses. */
-size_t parport_ieee1284_epp_read_addr (struct parport *port,
-				       void *buffer, size_t len,
-				       int flags)
-{
-	/* This is untested. */
-	unsigned char *bp = (unsigned char *) buffer;
-	unsigned ret = 0;
-
-	parport_frob_control (port,
-			      PARPORT_CONTROL_STROBE |
-			      PARPORT_CONTROL_SELECT |
-			      PARPORT_CONTROL_AUTOFD, 0);
-	port->ops->data_reverse (port);
-	for (; len > 0; len--, bp++) {
-		if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY,
-					     PARPORT_STATUS_BUSY))
-			break;
-
-		parport_frob_control (port, PARPORT_CONTROL_SELECT,
-				      PARPORT_CONTROL_SELECT);
-
-		if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0))
-			break;
-
-		*bp = parport_read_data (port);
-
-		parport_frob_control (port, PARPORT_CONTROL_SELECT, 0);
-		ret++;
-	}
-	port->ops->data_forward (port);
-
-	return ret;
-}