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Date:   Wed, 27 Feb 2019 15:19:01 +0800
From:   Morris Ku <saumah@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     morris_ku@...ix.com, linux-kernel@...r.kernel.org,
        Morris Ku <saumah@...il.com>
Subject: [PATCH 5/5] Add driver for SUNIX parallel board

Support SUNIX parallel board.

---
 char/snx/snx_ieee1284.c     |  207 ++++++
 char/snx/snx_ieee1284_ops.c |  257 ++++++++
 char/snx/snx_lp.c           | 1019 +++++++++++++++++++++++++++++
 char/snx/snx_parallel.c     |  437 +++++++++++++
 char/snx/snx_ppdev.c        | 1209 +++++++++++++++++++++++++++++++++++
 char/snx/snx_share.c        |  974 ++++++++++++++++++++++++++++
 6 files changed, 4103 insertions(+)
 create mode 100644 char/snx/snx_ieee1284.c
 create mode 100644 char/snx/snx_ieee1284_ops.c
 create mode 100644 char/snx/snx_lp.c
 create mode 100644 char/snx/snx_parallel.c
 create mode 100644 char/snx/snx_ppdev.c
 create mode 100644 char/snx/snx_share.c

diff --git a/char/snx/snx_ieee1284.c b/char/snx/snx_ieee1284.c
new file mode 100644
index 00000000..f357d9bd
--- /dev/null
+++ b/char/snx/snx_ieee1284.c
@@ -0,0 +1,207 @@
+#include "snx_common.h"
+
+
+static void sunix_parport_ieee1284_wakeup(struct snx_parport *port)
+{
+	up(&port->physport->ieee1284.irq);
+}
+
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 15, 0))
+static struct snx_parport *port_from_cookie[SNX_PAR_TOTAL_MAX];
+#endif
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0))
+
+static void sunix_timeout_waiting_on_port(struct timer_list *t)
+{
+	struct snx_parport *port = from_timer(port, t, timer);
+
+	sunix_parport_ieee1284_wakeup(port);
+}
+#else
+
+static void sunix_timeout_waiting_on_port(unsigned long cookie)
+{
+	sunix_parport_ieee1284_wakeup(port_from_cookie[cookie % SNX_PAR_TOTAL_MAX]);
+}
+#endif
+
+
+
+int sunix_parport_wait_event(struct snx_parport *port, signed long timeout)
+{
+	int ret;
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0))
+#else
+	struct timer_list timer;
+#endif
+
+	if (!port->physport->cad->timeout) {
+		return 1;
+	}
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0))
+
+	timer_setup(&port->timer, sunix_timeout_waiting_on_port, 0);
+	mod_timer(&port->timer, jiffies + timeout);
+#else
+	init_timer (&timer);
+	timer.expires = jiffies + timeout;
+	timer.function = sunix_timeout_waiting_on_port;
+	port_from_cookie[port->number % PARPORT_MAX] = port;
+	timer.data = port->number;
+
+	add_timer (&timer);
+
+#endif
+	ret = down_interruptible(&port->physport->ieee1284.irq);
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0))
+	if (!del_timer(&port->timer) && !ret)
+#else
+	if (!del_timer(&timer) && !ret)
+#endif
+
+	{
+		ret = 1;
+	}
+
+	return ret;
+}
+
+
+int sunix_parport_poll_peripheral(struct snx_parport *port, unsigned char mask, unsigned char result, int usec)
+{
+	int count = usec / 5 + 2;
+	int i;
+	unsigned char status;
+
+	for (i = 0; i < count; i++) {
+		status = sunix_parport_read_status(port);
+
+		if ((status & mask) == result) {
+			return 0;
+		}
+
+		if (signal_pending(current)) {
+			return -EINTR;
+		}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 19))
+		if (need_resched()) {
+			break;
+		}
+#else
+		if (current->need_resched) {
+			break;
+		}
+#endif
+		if (i >= 2) {
+			udelay (5);
+		}
+	}
+
+	return 1;
+}
+
+
+int sunix_parport_wait_peripheral(struct snx_parport *port, unsigned char mask, unsigned char result)
+{
+	int ret;
+	int usec;
+	unsigned long deadline;
+	unsigned char status;
+
+	usec = port->physport->spintime;// usecs of fast polling
+
+	if (!port->physport->cad->timeout) {
+		usec = 35000;
+	}
+
+	ret = sunix_parport_poll_peripheral(port, mask, result, usec);
+
+	if (ret != 1) {
+		return ret;
+	}
+
+	if (!port->physport->cad->timeout) {
+		return 1;
+	}
+
+	deadline = jiffies + (HZ + 24) / 25;
+
+	while (time_before(jiffies, deadline)) {
+		int ret;
+
+		if (signal_pending(current)) {
+			return -EINTR;
+		}
+
+		//if ((ret = sunix_parport_wait_event(port, (HZ + 99) / 100)) < 0) {
+		ret = sunix_parport_wait_event (port, (HZ + 99) / 100);
+		if (ret < 0) {
+			return ret;
+		}
+
+		status = sunix_parport_read_status(port);
+		if ((status & mask) == result) {
+			return 0;
+		}
+
+		if (!ret) {
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 13))
+			__set_current_state (TASK_INTERRUPTIBLE);
+			schedule_timeout ((HZ + 99) / 100);
+#else
+			schedule_timeout_interruptible(msecs_to_jiffies(10));
+#endif
+		}
+	}
+
+	return 1;
+}
+
+
+int sunix_parport_negotiate(struct snx_parport *port, int mode)
+{
+	if (mode == IEEE1284_MODE_COMPAT) {
+		return 0;
+	}
+
+	return -1;
+}
+
+
+ssize_t sunix_parport_write(struct snx_parport *port, const void *buffer, size_t len)
+{
+	ssize_t ret;
+	ret = port->ops->compat_write_data(port, buffer, len, 0);
+
+	return ret;
+}
+
+
+ssize_t sunix_parport_read(struct snx_parport *port, void *buffer, size_t len)
+{
+	printk("SNX Warng: parport%d IEEE1284 not supported in this driver module.\n", port->portnum);
+	return -ENODEV;
+}
+
+
+long sunix_parport_set_timeout(struct snx_pardevice *dev, long inactivity)
+{
+	long int old = dev->timeout;
+
+	dev->timeout = inactivity;
+
+	if (dev->port->physport->cad == dev) {
+		sunix_parport_ieee1284_wakeup(dev->port);
+	}
+
+	return old;
+}
+
diff --git a/char/snx/snx_ieee1284_ops.c b/char/snx/snx_ieee1284_ops.c
new file mode 100644
index 00000000..527dffbc
--- /dev/null
+++ b/char/snx/snx_ieee1284_ops.c
@@ -0,0 +1,257 @@
+#include "snx_common.h"
+
+
+size_t sunix_parport_ieee1284_write_compat(struct snx_parport *port, const void *buffer, size_t len, int flags)
+{
+	int no_irq = 1;
+	ssize_t count = 0;
+	const unsigned char *addr = buffer;
+	unsigned char byte;
+	struct snx_pardevice *dev = port->physport->cad;
+	unsigned char ctl = (PARPORT_CONTROL_SELECT | PARPORT_CONTROL_INIT);
+
+	if (port->irq != PARPORT_IRQ_NONE) {
+		sunix_parport_enable_irq(port);
+		no_irq = 0;
+	}
+
+	port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;
+	sunix_parport_write_control(port, ctl);
+	sunix_parport_data_forward(port);
+
+	while (count < len) {
+		unsigned 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);
+
+		do {
+			if (!sunix_parport_wait_peripheral(port, mask, val)) {
+				goto ready;
+			}
+
+			if ((sunix_parport_read_status(port) & (PARPORT_STATUS_PAPEROUT | PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR)) != (PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR)) {
+				goto stop;
+			}
+
+			if (!time_before (jiffies, expire)) {
+				break;
+			}
+
+			if (count && no_irq) {
+				sunix_parport_release(dev);
+
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 13))
+				__set_current_state (TASK_INTERRUPTIBLE);
+				schedule_timeout (wait);
+#else
+				schedule_timeout_interruptible(wait);
+#endif
+				sunix_parport_claim_or_block(dev);
+			} else {
+				sunix_parport_wait_event(port, wait);
+			}
+
+			if (signal_pending (current)) {
+				break;
+			}
+
+			wait *= 2;
+		} while (time_before(jiffies, expire));
+
+		if (signal_pending(current)) {
+			break;
+		}
+
+		break;
+
+ready:
+		byte = *addr++;
+		sunix_parport_write_data(port, byte);
+		udelay (1);
+
+		sunix_parport_write_control(port, ctl | PARPORT_CONTROL_STROBE);
+		udelay (1);
+
+		sunix_parport_write_control(port, ctl);
+		udelay (1);
+
+		count++;
+
+		if (time_before(jiffies, expire)) {
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 19))
+			if (!sunix_parport_yield_blocking(dev) && need_resched()) {
+				schedule ();
+			}
+#else
+			if (!sunix_parport_yield_blocking(dev) && current->need_resched) {
+				schedule ();
+			}
+#endif
+		}
+	}
+stop:
+	port->physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
+
+	return count;
+}
+
+
+size_t sunix_parport_ieee1284_read_nibble(struct snx_parport *port, void *buffer, size_t len, int flags)
+{
+	return 0;
+}
+
+
+size_t sunix_parport_ieee1284_read_byte(struct snx_parport *port, void *buffer, size_t len, int flags)
+{
+	return 0;
+}
+
+
+size_t sunix_parport_ieee1284_ecp_write_data(struct snx_parport *port, const void *buffer, size_t len, int flags)
+{
+	return 0;
+}
+
+
+size_t sunix_parport_ieee1284_ecp_read_data(struct snx_parport *port, void *buffer, size_t len, int flags)
+{
+	return 0;
+}
+
+
+size_t sunix_parport_ieee1284_ecp_write_addr(struct snx_parport *port, const void *buffer, size_t len, int flags)
+{
+	return 0;
+}
+
+
+size_t sunix_parport_ieee1284_epp_write_data(struct snx_parport *port, const void *buffer, size_t len, int flags)
+{
+	unsigned char *bp = (unsigned char *) buffer;
+	size_t ret = 0;
+
+	sunix_parport_frob_control(port, PARPORT_CONTROL_STROBE | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT | PARPORT_CONTROL_INIT,
+								PARPORT_CONTROL_STROBE | PARPORT_CONTROL_INIT);
+
+	port->ops->data_forward(port);
+
+	for (; len > 0; len--, bp++) {
+		sunix_parport_write_data(port, *bp);
+		sunix_parport_frob_control(port, PARPORT_CONTROL_AUTOFD, PARPORT_CONTROL_AUTOFD);
+
+		if (sunix_parport_poll_peripheral(port, PARPORT_STATUS_BUSY, 0, 10)) {
+			break;
+		}
+
+		sunix_parport_frob_control(port, PARPORT_CONTROL_AUTOFD, 0);
+
+		if (sunix_parport_poll_peripheral(port, PARPORT_STATUS_BUSY, PARPORT_STATUS_BUSY, 5)) {
+			break;
+		}
+
+		ret++;
+	}
+
+	sunix_parport_frob_control(port, PARPORT_CONTROL_STROBE, 0);
+	return ret;
+}
+
+
+size_t sunix_parport_ieee1284_epp_read_data(struct snx_parport *port, void *buffer, size_t len, int flags)
+{
+	unsigned char *bp = (unsigned char *) buffer;
+	unsigned ret = 0;
+
+	sunix_parport_frob_control(port, PARPORT_CONTROL_STROBE | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT | PARPORT_CONTROL_INIT,
+							PARPORT_CONTROL_INIT);
+
+	port->ops->data_reverse(port);
+
+	for (; len > 0; len--, bp++) {
+		sunix_parport_frob_control(port, PARPORT_CONTROL_AUTOFD, PARPORT_CONTROL_AUTOFD);
+
+		if (sunix_parport_wait_peripheral(port, PARPORT_STATUS_BUSY, 0)) {
+			break;
+		}
+
+		*bp = sunix_parport_read_data(port);
+
+		sunix_parport_frob_control(port, PARPORT_CONTROL_AUTOFD, 0);
+
+		if (sunix_parport_poll_peripheral(port, PARPORT_STATUS_BUSY, PARPORT_STATUS_BUSY, 5)) {
+			break;
+		}
+
+		ret++;
+	}
+	port->ops->data_forward(port);
+	return ret;
+}
+
+
+size_t sunix_parport_ieee1284_epp_write_addr(struct snx_parport *port, const void *buffer, size_t len, int flags)
+{
+	unsigned char *bp = (unsigned char *)buffer;
+	size_t ret = 0;
+
+	sunix_parport_frob_control(port, PARPORT_CONTROL_STROBE | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT | PARPORT_CONTROL_INIT,
+								PARPORT_CONTROL_STROBE | PARPORT_CONTROL_INIT);
+
+	port->ops->data_forward(port);
+
+	for (; len > 0; len--, bp++) {
+		sunix_parport_write_data(port, *bp);
+		sunix_parport_frob_control(port, PARPORT_CONTROL_SELECT, PARPORT_CONTROL_SELECT);
+
+		if (sunix_parport_poll_peripheral(port, PARPORT_STATUS_BUSY, 0, 10)) {
+			break;
+		}
+
+		sunix_parport_frob_control(port, PARPORT_CONTROL_SELECT, 0);
+
+		if (sunix_parport_poll_peripheral(port, PARPORT_STATUS_BUSY, PARPORT_STATUS_BUSY, 5)) {
+			break;
+		}
+
+		ret++;
+	}
+
+	sunix_parport_frob_control(port, PARPORT_CONTROL_STROBE, 0);
+	return ret;
+}
+
+
+size_t sunix_parport_ieee1284_epp_read_addr(struct snx_parport *port, void *buffer, size_t len, int flags)
+{
+	unsigned char *bp = (unsigned char *) buffer;
+	unsigned ret = 0;
+
+	sunix_parport_frob_control(port, PARPORT_CONTROL_STROBE | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT | PARPORT_CONTROL_INIT,
+								PARPORT_CONTROL_INIT);
+
+	port->ops->data_reverse(port);
+
+	for (; len > 0; len--, bp++) {
+		sunix_parport_frob_control(port, PARPORT_CONTROL_SELECT, PARPORT_CONTROL_SELECT);
+
+		if (sunix_parport_wait_peripheral(port, PARPORT_STATUS_BUSY, 0)) {
+			break;
+		}
+
+		*bp = sunix_parport_read_data(port);
+
+		sunix_parport_frob_control(port, PARPORT_CONTROL_SELECT, PARPORT_CONTROL_SELECT);
+
+		if (sunix_parport_poll_peripheral(port, PARPORT_STATUS_BUSY, PARPORT_STATUS_BUSY, 5)) {
+			break;
+		}
+
+		ret++;
+	}
+
+	port->ops->data_forward(port);
+	return ret;
+}
+
diff --git a/char/snx/snx_lp.c b/char/snx/snx_lp.c
new file mode 100644
index 00000000..ecbee621
--- /dev/null
+++ b/char/snx/snx_lp.c
@@ -0,0 +1,1019 @@
+#include "snx_common.h"
+#include "snx_lp.h"
+
+
+#undef SNX_LP_STATS
+
+static int SNX_PAL_MAJOR ;
+
+#define SNX_LP_NO SNX_PAR_TOTAL_MAX
+//#define SNX_CONFIG_LP_CONSOLE
+#undef SNX_CONFIG_LP_CONSOLE
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
+static devfs_handle_t snx_devfs_handle;
+#endif
+
+static struct snx_lp_struct snx_lp_table[SNX_LP_NO];
+
+static unsigned int snx_lp_count;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static struct class *snx_lp_class;
+#else
+#endif
+
+#ifdef SNX_CONFIG_LP_CONSOLE
+static struct snx_parport *console_registered;
+#endif
+
+
+#define SNX_LP_PREEMPT_REQUEST 1
+#define SNX_LP_PARPORT_CLAIMED 2
+
+
+#define r_dtr(x)		(sunix_parport_read_data(snx_lp_table[(x)].dev->port))
+#define r_str(x)		(sunix_parport_read_status(snx_lp_table[(x)].dev->port))
+#define w_ctr(x, y)	do { sunix_parport_write_control(snx_lp_table[(x)].dev->port, (y)); } while (0)
+#define w_dtr(x, y)	do { sunix_parport_write_data(snx_lp_table[(x)].dev->port, (y)); } while (0)
+
+
+
+static void snx_lp_claim_parport_or_block(struct snx_lp_struct *this_lp)
+{
+	if (!test_and_set_bit(SNX_LP_PARPORT_CLAIMED, &this_lp->bits)) {
+		sunix_parport_claim_or_block(this_lp->dev);
+	}
+}
+
+
+static void snx_lp_release_parport(struct snx_lp_struct *this_lp)
+{
+	if (test_and_clear_bit(SNX_LP_PARPORT_CLAIMED, &this_lp->bits)) {
+		sunix_parport_release(this_lp->dev);
+	}
+}
+
+
+static int snx_lp_preempt(void *handle)
+{
+	struct snx_lp_struct *this_lp = (struct snx_lp_struct *)handle;
+	set_bit(SNX_LP_PREEMPT_REQUEST, &this_lp->bits);
+	return 1;
+}
+
+
+static int snx_lp_negotiate(struct snx_parport *port, int mode)
+{
+	if (sunix_parport_negotiate(port, mode) != 0) {
+		mode = IEEE1284_MODE_COMPAT;
+		sunix_parport_negotiate(port, mode);
+	}
+	return (mode);
+}
+
+
+static int snx_lp_reset(int minor)
+{
+	int retval;
+	snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
+
+	w_ctr(minor, SNX_LP_PSELECP);
+
+	udelay(SNX_LP_DELAY);
+
+	w_ctr(minor, SNX_LP_PSELECP | SNX_LP_PINITP);
+
+	retval = r_str(minor);
+
+	snx_lp_release_parport(&snx_lp_table[minor]);
+	return retval;
+}
+
+
+static void snx_lp_error(int minor)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	DEFINE_WAIT(wait);
+#endif
+	int polling;
+
+	if (SNX_LP_F(minor) & SNX_LP_ABORT) {
+		return;
+	}
+
+	polling = snx_lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
+
+	if (polling) {
+		snx_lp_release_parport(&snx_lp_table[minor]);
+	}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	prepare_to_wait(&snx_lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
+
+	schedule_timeout(SNX_LP_TIMEOUT_POLLED);
+	finish_wait(&snx_lp_table[minor].waitq, &wait);
+#else
+	interruptible_sleep_on_timeout(&snx_lp_table[minor].waitq, SNX_LP_TIMEOUT_POLLED);
+#endif
+
+	if (polling) {
+		snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
+	} else {
+		sunix_parport_yield_blocking(snx_lp_table[minor].dev);
+	}
+}
+
+
+static int snx_lp_check_status(int minor)
+{
+	int error = 0;
+	unsigned int last = snx_lp_table[minor].last_error;
+	unsigned char status = r_str(minor);
+
+	if ((status & SNX_LP_PERRORP) && !(SNX_LP_F(minor) & SNX_LP_CAREFUL)) {
+		last = 0;
+	} else if ((status & SNX_LP_POUTPA)) {
+		if (last != SNX_LP_POUTPA) {
+			last = SNX_LP_POUTPA;
+			printk("SNX Info : lp%d port out of paper.\n", minor);
+		}
+		error = -ENOSPC;
+	} else if (!(status & SNX_LP_PSELECD)) {
+		if (last != SNX_LP_PSELECD) {
+			last = SNX_LP_PSELECD;
+			printk("SNX Info : lp%d port off-line.\n", minor);
+		}
+		error = -EIO;
+	} else if (!(status & SNX_LP_PERRORP)) {
+		if (last != SNX_LP_PERRORP) {
+			last = SNX_LP_PERRORP;
+			printk("SNX Info : lp%d port on fire.\n", minor);
+		}
+		error = -EIO;
+	} else {
+		last = 0;
+	}
+
+	snx_lp_table[minor].last_error = last;
+
+	if (last != 0) {
+		snx_lp_error(minor);
+	}
+	return error;
+}
+
+
+static int snx_lp_wait_ready(int minor, int nonblock)
+{
+	int error = 0;
+
+	if (snx_lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
+		return 0;
+	}
+
+	do {
+		error = snx_lp_check_status(minor);
+
+		if (error && (nonblock || (SNX_LP_F(minor) & SNX_LP_ABORT))) {
+			break;
+		}
+
+		if (signal_pending(current)) {
+			error = -EINTR;
+			break;
+		}
+	} while (error);
+
+	return error;
+}
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+static ssize_t snx_lp_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+#else
+static ssize_t snx_lp_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
+#endif
+{
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 19))
+    unsigned int minor = iminor(file->f_path.dentry->d_inode);
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+    unsigned int minor = iminor(file->f_dentry->d_inode);
+#else
+    unsigned int minor = MINOR (file->f_dentry->d_inode->i_rdev);
+#endif
+
+
+	struct snx_parport *port = snx_lp_table[minor].dev->port;
+	char *kbuf = snx_lp_table[minor].lp_buffer;
+
+	ssize_t retv = 0;
+	ssize_t written;
+	size_t copy_size = count;
+	int nonblock = ((file->f_flags & O_NONBLOCK) || (SNX_LP_F(minor) & SNX_LP_ABORT));
+
+
+#ifdef SNX_LP_STATS
+	if (time_after(jiffies, snx_lp_table[minor].lastcall + SNX_LP_TIME(minor))) {
+		snx_lp_table[minor].runchars = 0;
+	}
+
+	snx_lp_table[minor].lastcall = jiffies;
+#endif
+
+	if (copy_size > SNX_LP_BUFFER_SIZE) {
+		copy_size = SNX_LP_BUFFER_SIZE;
+	}
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24))
+	if (down_interruptible(&snx_lp_table[minor].port_mutex))
+#else
+	if (mutex_lock_interruptible(&snx_lp_table[minor].port_mutex))
+#endif
+	{
+		return -EINTR;
+	}
+
+	if (copy_from_user(kbuf, buf, copy_size)) {
+		retv = -EFAULT;
+		goto out_unlock;
+	}
+
+	snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
+
+	snx_lp_table[minor].current_mode = snx_lp_negotiate(port, snx_lp_table[minor].best_mode);
+
+	sunix_parport_set_timeout(snx_lp_table[minor].dev, (nonblock ? SNX_PARPORT_INACTIVITY_O_NONBLOCK : snx_lp_table[minor].timeout));
+
+	retv = snx_lp_wait_ready(minor, nonblock);
+
+	//if ((retv = snx_lp_wait_ready(minor, nonblock)) == 0)
+
+	do {
+		written = sunix_parport_write(port, kbuf, copy_size);
+		if (written > 0) {
+			copy_size -= written;
+			count -= written;
+			buf  += written;
+			retv += written;
+		}
+
+		if (signal_pending(current)) {
+			if (retv == 0) {
+				retv = -EINTR;
+			}
+			break;
+		}
+
+		if (copy_size > 0) {
+			int error;
+
+			sunix_parport_negotiate(snx_lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
+			snx_lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
+
+			error = snx_lp_wait_ready(minor, nonblock);
+
+			if (error) {
+				if (retv == 0) {
+					retv = error;
+				}
+				break;
+			} else if (nonblock) {
+				if (retv == 0) {
+					retv = -EAGAIN;
+				}
+				break;
+			}
+
+			sunix_parport_yield_blocking(snx_lp_table[minor].dev);
+			snx_lp_table[minor].current_mode = snx_lp_negotiate(port, snx_lp_table[minor].best_mode);
+
+		}
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 19))
+		else if (need_resched()) {
+			schedule ();
+		}
+#else
+		else if (current->need_resched) {
+			schedule ();
+		}
+#endif
+
+		if (count) {
+			copy_size = count;
+			if (copy_size > SNX_LP_BUFFER_SIZE) {
+				copy_size = SNX_LP_BUFFER_SIZE;
+			}
+
+			if (copy_from_user(kbuf, buf, copy_size)) {
+				if (retv == 0) {
+					retv = -EFAULT;
+				}
+				break;
+			}
+		}
+	} while (count > 0);
+
+	if (test_and_clear_bit(SNX_LP_PREEMPT_REQUEST, &snx_lp_table[minor].bits)) {
+		printk("SNX Info : lp%d releasing parport.\n", minor);
+		sunix_parport_negotiate(snx_lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
+
+		snx_lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
+
+		snx_lp_release_parport(&snx_lp_table[minor]);
+	}
+
+out_unlock:
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24))
+	up(&snx_lp_table[minor].port_mutex);
+#else
+	mutex_unlock(&snx_lp_table[minor].port_mutex);
+#endif
+	return retv;
+}
+
+
+#ifdef SNX_CONFIG_PARPORT_1284
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+static ssize_t snx_lp_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+#else
+static ssize_t snx_lp_read(struct file *file, char *buf, size_t count, loff_t *ppos)
+#endif
+{
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 19))
+    unsigned int minor = iminor(file->f_path.dentry->d_inode);
+    DEFINE_WAIT(wait);
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+    unsigned int minor = iminor(file->f_dentry->d_inode);
+    DEFINE_WAIT(wait);
+#else
+    unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
+#endif
+
+    struct snx_parport *port = snx_lp_table[minor].dev->port;
+	ssize_t retval = 0;
+	char *kbuf = snx_lp_table[minor].lp_buffer;
+	int nonblock = ((file->f_flags & O_NONBLOCK) || (SNX_LP_F(minor) & SNX_LP_ABORT));
+
+	if (count > SNX_LP_BUFFER_SIZE) {
+		count = SNX_LP_BUFFER_SIZE;
+	}
+
+	if (down_interruptible(&snx_lp_table[minor].port_mutex)) {
+		return -EINTR;
+	}
+
+	snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
+
+	sunix_parport_set_timeout(snx_lp_table[minor].dev, (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK : snx_lp_table[minor].timeout));
+
+	sunix_parport_negotiate(snx_lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
+
+	if (sunix_parport_negotiate(snx_lp_table[minor].dev->port, IEEE1284_MODE_NIBBLE)) {
+		retval = -EIO;
+		goto out;
+	}
+
+	while (retval == 0) {
+		retval = sunix_parport_read(port, kbuf, count);
+
+		if (retval > 0) {
+			break;
+		}
+
+		if (nonblock) {
+			retval = -EAGAIN;
+			break;
+		}
+
+		if (snx_lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
+			sunix_parport_negotiate(snx_lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
+			snx_lp_error(minor);
+
+			if (sunix_parport_negotiate(snx_lp_table[minor].dev->port, IEEE1284_MODE_NIBBLE)) {
+				retval = -EIO;
+				goto out;
+			}
+		} else {
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+			prepare_to_wait(&snx_lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
+			schedule_timeout(SNX_LP_TIMEOUT_POLLED);
+			finish_wait(&snx_lp_table[minor].waitq, &wait);
+#else
+			interruptible_sleep_on_timeout(&snx_lp_table[minor].waitq, SNX_LP_TIMEOUT_POLLED);
+#endif
+		}
+
+		if (signal_pending(current)) {
+			retval = -ERESTARTSYS;
+			break;
+		}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+		cond_resched();
+#else
+		if (current->need_resched) {
+			schedule();
+		}
+#endif
+	}
+
+	sunix_parport_negotiate(snx_lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
+
+out:
+	snx_lp_release_parport(&snx_lp_table[minor]);
+
+	if (retval > 0 && copy_to_user(buf, kbuf, retval)) {
+		retval = -EFAULT;
+	}
+
+	up(&snx_lp_table[minor].port_mutex);
+
+	return retval;
+}
+#endif
+
+
+static int snx_lp_open(struct inode *inode, struct file *file)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+    unsigned int minor = iminor(inode);
+#else
+	unsigned int minor = MINOR(inode->i_rdev);
+#endif
+
+	if (minor >= SNX_LP_NO) {
+		return -ENXIO;
+	}
+
+	if ((SNX_LP_F(minor) & SNX_LP_EXIST) == 0) {
+		return -ENXIO;
+	}
+
+	if (test_and_set_bit(SNX_LP_BUSY_BIT_POS, &SNX_LP_F(minor))) {
+		return -EBUSY;
+	}
+
+	if ((SNX_LP_F(minor) & SNX_LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
+		int status;
+		snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
+		status = r_str(minor);
+		snx_lp_release_parport(&snx_lp_table[minor]);
+
+		if (status & SNX_LP_POUTPA) {
+			printk("SNX Error: lp%d out of paper.\n", minor);
+			SNX_LP_F(minor) &= ~SNX_LP_BUSY;
+			return -ENOSPC;
+		} else if (!(status & SNX_LP_PSELECD)) {
+			printk("SNX Error: lp%d off-line.\n", minor);
+			SNX_LP_F(minor) &= ~SNX_LP_BUSY;
+			return -EIO;
+		} else if (!(status & SNX_LP_PERRORP)) {
+			printk("SNX Error: lp%d printer error.\n", minor);
+			SNX_LP_F(minor) &= ~SNX_LP_BUSY;
+			return -EIO;
+		}
+	}
+
+	snx_lp_table[minor].lp_buffer = kmalloc(SNX_LP_BUFFER_SIZE, GFP_KERNEL);
+
+	if (!snx_lp_table[minor].lp_buffer) {
+		SNX_LP_F(minor) &= ~SNX_LP_BUSY;
+		return -ENOMEM;
+	}
+
+	snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
+
+	if ((snx_lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && !sunix_parport_negotiate (snx_lp_table[minor].dev->port, IEEE1284_MODE_ECP)) {
+		printk("SNX Info : lp%d ECP mode.\n", minor);
+		snx_lp_table[minor].best_mode = IEEE1284_MODE_ECP;
+	} else {
+		snx_lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
+	}
+
+	sunix_parport_negotiate(snx_lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
+
+	snx_lp_release_parport(&snx_lp_table[minor]);
+	snx_lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+		try_module_get(THIS_MODULE);
+#else
+		MOD_INC_USE_COUNT;
+#endif
+
+	return 0;
+}
+
+
+static int snx_lp_release(struct inode *inode, struct file *file)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+    unsigned int minor = iminor(inode);
+#else
+	unsigned int minor = MINOR(inode->i_rdev);
+#endif
+
+	snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
+	sunix_parport_negotiate(snx_lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
+
+	snx_lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
+	snx_lp_release_parport(&snx_lp_table[minor]);
+	kfree(snx_lp_table[minor].lp_buffer);
+	snx_lp_table[minor].lp_buffer = NULL;
+	SNX_LP_F(minor) &= ~SNX_LP_BUSY;
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+		module_put(THIS_MODULE);
+#else
+		MOD_DEC_USE_COUNT;
+#endif
+
+	return 0;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
+static int snx_lp_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+    unsigned int minor = iminor(inode);
+#else
+	unsigned int minor = MINOR(inode->i_rdev);
+#endif
+
+	int status;
+	int retval = 0;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+	void __user *argp = (void __user *)arg;
+#endif
+
+
+	if (minor >= SNX_LP_NO) {
+		return -ENODEV;
+	}
+
+	if ((SNX_LP_F(minor) & SNX_LP_EXIST) == 0) {
+		return -ENODEV;
+	}
+
+		switch (cmd) {
+		struct timeval par_timeout;
+		long to_jiffies;
+
+		case SNX_LPTIME:
+			SNX_LP_TIME(minor) = arg * HZ/100;
+			break;
+
+
+		case SNX_LPCHAR:
+			SNX_LP_CHAR(minor) = arg;
+			break;
+
+
+		case SNX_LPABORT:
+			if (arg) {
+				SNX_LP_F(minor) |= SNX_LP_ABORT;
+			} else {
+				SNX_LP_F(minor) &= ~SNX_LP_ABORT;
+			}
+			break;
+
+
+		case SNX_LPABORTOPEN:
+			if (arg) {
+				SNX_LP_F(minor) |= SNX_LP_ABORTOPEN;
+			} else {
+				SNX_LP_F(minor) &= ~SNX_LP_ABORTOPEN;
+			}
+			break;
+
+
+		case SNX_LPCAREFUL:
+			if (arg) {
+				SNX_LP_F(minor) |= SNX_LP_CAREFUL;
+			} else {
+				SNX_LP_F(minor) &= ~SNX_LP_CAREFUL;
+			}
+			break;
+
+		case SNX_LPWAIT:
+			SNX_LP_WAIT(minor) = arg;
+			break;
+
+
+		case SNX_LPSETIRQ:
+			return -EINVAL;
+			break;
+
+
+		case SNX_LPGETIRQ:
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &SNX_LP_IRQ(minor), sizeof(int)))
+#else
+			if (copy_to_user((int *) arg, &SNX_LP_IRQ(minor), sizeof(int)))
+#endif
+			{
+				return -EFAULT;
+			}
+			break;
+
+
+		case SNX_LPGETSTATUS:
+			snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
+			status = r_str(minor);
+			snx_lp_release_parport(&snx_lp_table[minor]);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &status, sizeof(int)))
+#else
+			if (copy_to_user((int *) arg, &status, sizeof(int)))
+#endif
+			{
+				return -EFAULT;
+			}
+			break;
+
+
+		case SNX_LPRESET:
+			snx_lp_reset(minor);
+			break;
+
+
+#ifdef SNX_LP_STATS
+		case SNX_LPGETSTATS:
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &SNX_LP_STAT(minor),	sizeof(struct snx_lp_stats)))
+#else
+			if (copy_to_user((int *) arg, &SNX_LP_STAT(minor), sizeof(struct snx_lp_stats)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			if (capable(CAP_SYS_ADMIN)) {
+				memset(&SNX_LP_STAT(minor), 0, sizeof(struct snx_lp_stats));
+			}
+			break;
+#endif
+
+
+		case SNX_LPGETFLAGS:
+			status = SNX_LP_F(minor);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &status, sizeof(int)))
+#else
+			if (copy_to_user((int *) arg, &status, sizeof(int)))
+#endif
+			{
+				return -EFAULT;
+			}
+			break;
+
+
+		case SNX_LPSETTIMEOUT:
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_from_user(&par_timeout, argp, sizeof (struct timeval)))
+#else
+			if (copy_from_user(&par_timeout, (struct timeval *) arg, sizeof (struct timeval)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) {
+				return -EINVAL;
+			}
+
+			to_jiffies = SNX_ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
+			to_jiffies += par_timeout.tv_sec * (long) HZ;
+			if (to_jiffies <= 0) {
+				return -EINVAL;
+			}
+			snx_lp_table[minor].timeout = to_jiffies;
+			break;
+
+
+		default:
+			retval = -EINVAL;
+	}
+
+	return retval;
+}
+#endif
+
+static struct file_operations snx_lp_fops = {
+	.owner		= THIS_MODULE,
+	.write		= snx_lp_write,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
+  .ioctl    = snx_lp_ioctl,
+#endif
+	.open		= snx_lp_open,
+	.release	= snx_lp_release,
+#ifdef SNX_CONFIG_PARPORT_1284
+	.read		= snx_lp_read,
+#endif
+};
+
+
+#ifdef SNX_CONFIG_LP_CONSOLE
+#define SNX_CONSOLE_LP 0
+
+#define SNX_CONSOLE_LP_STRICT 1
+
+static void snx_lp_console_write(struct console *co, const char *s, unsigned count)
+{
+	struct snx_pardevice *dev = snx_lp_table[SNX_CONSOLE_LP].dev;
+	struct snx_parport *port = dev->port;
+	ssize_t written;
+
+	if (sunix_parport_claim(dev)) {
+		return;
+	}
+
+	sunix_parport_set_timeout(dev, 0);
+
+	sunix_parport_negotiate(port, IEEE1284_MODE_COMPAT);
+
+	do {
+		ssize_t canwrite = count;
+		char *lf = memchr(s, '\n', count);
+
+		if (lf) {
+			canwrite = lf - s;
+		}
+
+		if (canwrite > 0) {
+			written = sunix_parport_write(port, s, canwrite);
+
+			if (written <= 0) {
+				continue;
+			}
+
+			s += written;
+			count -= written;
+			canwrite -= written;
+		}
+
+		if (lf && canwrite <= 0) {
+			const char *crlf = "\r\n";
+			int i = 2;
+
+			s++;
+			count--;
+			do {
+				written = sunix_parport_write(port, crlf, i);
+				if (written > 0) {
+					i -= written, crlf += written;
+				}
+			} while (i > 0 && (SNX_CONSOLE_LP_STRICT || written > 0));
+		}
+	} while (count > 0 && (SNX_CONSOLE_LP_STRICT || written > 0));
+
+	sunix_parport_release(dev);
+}
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+static struct console snx_lpcons = {
+	.name		= "lx",
+	.write		= snx_lp_console_write,
+	.flags		= CON_PRINTBUFFER,
+};
+#else
+static kdev_t snx_lp_console_device(struct console *c)
+{
+	return MKDEV(SNX_PAL_MAJOR, SNX_CONSOLE_LP);
+}
+
+static struct console snx_lpcons = {
+	name:		"lx",
+	write :		snx_lp_console_write,
+	device :		snx_lp_console_device,
+	flags :		CON_PRINTBUFFER,
+};
+#endif
+#endif
+
+
+static int snx_parport_nr[SNX_LP_NO] = {0, 1, 2, 3};
+static int reset;
+
+
+static int snx_lp_register(int nr, struct snx_parport *port)
+{
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
+	char name[8];
+#endif
+
+	snx_lp_table[nr].dev = sunix_parport_register_device(port, "lx", snx_lp_preempt, NULL, NULL, 0, (void *) &snx_lp_table[nr]);
+
+	if (snx_lp_table[nr].dev == NULL) {
+		return 1;
+	}
+
+	snx_lp_table[nr].flags |= SNX_LP_EXIST;
+
+	if (reset) {
+		snx_lp_reset(nr);
+	}
+
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
+	sprintf(name, "%d", nr);
+	devfs_register(snx_devfs_handle, name, DEVFS_FL_DEFAULT, SNX_PAL_MAJOR, nr, S_IFCHR | S_IRUGO | S_IWUGO,	&snx_lp_fops, NULL);
+
+#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17))
+	devfs_mk_cdev(MKDEV(SNX_PAL_MAJOR, nr), S_IFCHR | S_IRUGO | S_IWUGO, "printer/%d", nr);
+#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 23))
+	class_device_create(snx_lp_class, NULL, MKDEV(SNX_PAL_MAJOR, nr), NULL, "lp%d", nr);
+#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 26))
+	device_create(snx_lp_class, NULL, MKDEV(SNX_PAL_MAJOR, nr), "lp%d", nr);
+#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 27))
+	device_create_drvdata(snx_lp_class, NULL, MKDEV(SNX_PAL_MAJOR, nr), NULL, "lp%d", nr);
+#else
+	device_create(snx_lp_class, NULL, MKDEV(SNX_PAL_MAJOR, nr), NULL, "lp%d", nr);
+#endif
+
+	printk("SNX Info : lp%d port using %s (%s).\n", nr, port->name, (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
+
+#ifdef SNX_CONFIG_LP_CONSOLE
+
+	if (!nr) {
+		if (port->modes & PARPORT_MODE_SAFEININT) {
+			register_console(&snx_lpcons);
+			console_registered = port;
+			printk("SNX Info : lp%d port console ready.\n", SNX_CONSOLE_LP);
+		} else {
+			printk("SNX Info : lp%d port cannot run console on %s.\n", SNX_CONSOLE_LP, port->name);
+		}
+	}
+#endif
+	return 0;
+}
+
+
+static void snx_lp_attach(struct snx_parport *port)
+{
+	unsigned int i;
+
+	for (i = 0; i < SNX_LP_NO; i++) {
+		if (port->number == snx_parport_nr[i]) {
+			if (!snx_lp_register(i, port)) {
+				snx_lp_count++;
+			}
+			break;
+		}
+	}
+}
+
+
+static void snx_lp_detach(struct snx_parport *port)
+{
+#ifdef SNX_CONFIG_LP_CONSOLE
+	if (console_registered == port) {
+		unregister_console (&snx_lpcons);
+		console_registered = NULL;
+	}
+
+#endif
+}
+
+
+static struct snx_parport_driver snx_lp_driver = {
+	.name = "lx",
+	.attach = snx_lp_attach,
+	.detach = snx_lp_detach,
+};
+
+
+static int snx_lp_init(void)
+{
+	int i, err = 0;
+
+	for (i = 0; i < SNX_LP_NO; i++) {
+		snx_lp_table[i].dev = NULL;
+		snx_lp_table[i].flags = 0;
+		snx_lp_table[i].chars = SNX_LP_INIT_CHAR;
+		snx_lp_table[i].time = SNX_LP_INIT_TIME;
+		snx_lp_table[i].wait = SNX_LP_INIT_WAIT;
+		snx_lp_table[i].lp_buffer = NULL;
+
+#ifdef SNX_LP_STATS
+		snx_lp_table[i].lastcall = 0;
+		snx_lp_table[i].runchars = 0;
+		memset(&snx_lp_table[i].stats, 0, sizeof (struct snx_lp_stats));
+#endif
+		snx_lp_table[i].last_error = 0;
+		init_waitqueue_head (&snx_lp_table[i].waitq);
+		init_waitqueue_head (&snx_lp_table[i].dataq);
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24))
+		init_MUTEX(&snx_lp_table[i].port_mutex);
+#else
+		mutex_init(&snx_lp_table[i].port_mutex);
+#endif
+		snx_lp_table[i].timeout = 10 * HZ;
+	}
+
+	SNX_PAL_MAJOR = register_chrdev(0, "lx", &snx_lp_fops);
+
+	if (SNX_PAL_MAJOR < 0) {
+		printk("SNX Error: lp unable to get major \n");
+		return -EIO;
+	}
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
+    snx_devfs_handle = devfs_mk_dir(NULL, "sprinter", NULL);
+#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17))
+	devfs_mk_dir("sprinter");
+#else
+	snx_lp_class = class_create(THIS_MODULE, "sprinter");
+
+	if (IS_ERR(snx_lp_class)) {
+		err = PTR_ERR(snx_lp_class);
+		goto out_reg;
+	}
+#endif
+
+	if (sunix_parport_register_driver(&snx_lp_driver)) {
+		printk("SNX Error: lp unable to register with parport.\n");
+		err = -EIO;
+		goto out_class;
+	}
+
+	if (!snx_lp_count) {
+		printk("SNX Warng: lp driver loaded but no devices found.\n");
+	}
+
+	return 0;
+
+out_class:
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
+
+#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17))
+	devfs_remove("sprinter");
+#else
+	class_destroy(snx_lp_class);
+
+out_reg:
+#endif
+
+	unregister_chrdev(SNX_PAL_MAJOR, "lx");
+	return err;
+}
+
+
+int sunix_par_lp_init(void)
+{
+	int status = 0;
+	status = snx_lp_init();
+	return status;
+}
+
+
+void sunix_par_lp_exit(void)
+{
+	unsigned int offset;
+	sunix_parport_unregister_driver(&snx_lp_driver);
+
+#ifdef SNX_CONFIG_LP_CONSOLE
+	unregister_console(&snx_lpcons);
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
+    devfs_unregister(snx_devfs_handle);
+#endif
+
+	unregister_chrdev(SNX_PAL_MAJOR, "lx");
+
+
+	for (offset = 0; offset < SNX_LP_NO; offset++) {
+		if (snx_lp_table[offset].dev == NULL) {
+			continue;
+		}
+
+		sunix_parport_unregister_device(snx_lp_table[offset].dev);
+
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17))
+
+#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 23))
+		class_device_destroy(snx_lp_class, MKDEV(SNX_PAL_MAJOR, offset));
+#else
+		device_destroy(snx_lp_class, MKDEV(SNX_PAL_MAJOR, offset));
+#endif
+	}
+
+
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 0))
+
+#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17))
+	devfs_remove("sprinter");
+#else
+	class_destroy(snx_lp_class);
+#endif
+}
+
diff --git a/char/snx/snx_parallel.c b/char/snx/snx_parallel.c
new file mode 100644
index 00000000..174c309d
--- /dev/null
+++ b/char/snx/snx_parallel.c
@@ -0,0 +1,437 @@
+
+#include "snx_common.h"
+
+static LIST_HEAD(snx_ports_list);
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
+static DEFINE_SPINLOCK(snx_ports_lock);
+#else
+static spinlock_t snx_ports_lock = SPIN_LOCK_UNLOCKED;
+#endif
+static void sunix_frob_econtrol(struct snx_parport *, unsigned char, unsigned char);
+
+// ECR modes
+#define ECR_SPP 00
+#define ECR_PS2 01
+#define ECR_PPF 02
+#define ECR_ECP 03
+#define ECR_EPP 04
+#define ECR_VND 05
+#define ECR_TST 06
+#define ECR_CNF 07
+#define ECR_MODE_MASK 0xe0
+#define ECR_WRITE(p, v) sunix_frob_econtrol((p), 0xff, (v))
+
+
+static void sunix_frob_econtrol(struct snx_parport *pb, unsigned char m, unsigned char v)
+{
+	unsigned char ectr = 0;
+
+	if (m != 0xff) {
+		ectr = inb(SNX_ECR (pb));
+	}
+
+	outb((ectr & ~m) ^ v, SNX_ECR (pb));
+}
+
+
+static __inline__ void sunix_frob_set_mode(struct snx_parport *p, int mode)
+{
+	sunix_frob_econtrol(p, ECR_MODE_MASK, mode << 5);
+}
+
+
+static int sunix_clear_epp_timeout(struct snx_parport *pb)
+{
+	unsigned char dsr;
+	dsr = sunix_parport_pc_read_status(pb);
+
+	if (!(dsr & 0x01)) {
+		return 1;
+	}
+
+	sunix_parport_pc_read_status(pb);
+	dsr = sunix_parport_pc_read_status(pb);
+
+	outb(dsr | 0x01, SNX_DSR (pb));
+	outb(dsr & 0xfe, SNX_DSR (pb));
+
+	dsr = sunix_parport_pc_read_status(pb);
+
+	return !(dsr & 0x01);
+}
+
+
+static void sunix_parport_pc_init_state(struct snx_pardevice *dev, struct snx_parport_state *s)
+{
+	s->u.pc.ctr = 0xc;
+	if (dev->irq_func && dev->port->irq != PARPORT_IRQ_NONE) {
+		s->u.pc.ctr |= 0x10;
+	}
+
+	s->u.pc.ecr = 0x34;
+}
+
+
+static void sunix_parport_pc_save_state(struct snx_parport *p, struct snx_parport_state *s)
+{
+	const struct sunix_par_port *priv = p->physport->private_data;
+
+	s->u.pc.ctr = priv->ctr;
+
+	if (priv->ecr) {
+		s->u.pc.ecr = inb(SNX_ECR (p));
+	}
+}
+
+
+static void sunix_parport_pc_restore_state(struct snx_parport *p, struct snx_parport_state *s)
+{
+	struct sunix_par_port *priv = p->physport->private_data;
+	register unsigned char c = s->u.pc.ctr & priv->ctr_writable;
+
+	outb(c, SNX_DCR (p));
+	priv->ctr = c;
+
+	if (priv->ecr) {
+		ECR_WRITE(p, s->u.pc.ecr);
+	}
+}
+
+
+static const struct snx_parport_ops sunix_parport_pc_ops = {
+	.write_data			= sunix_parport_pc_write_data,
+	.read_data			= sunix_parport_pc_read_data,
+	.write_control		= sunix_parport_pc_write_control,
+	.read_control		= sunix_parport_pc_read_control,
+	.frob_control		= sunix_parport_pc_frob_control,
+	.read_status		= sunix_parport_pc_read_status,
+	.enable_irq			= sunix_parport_pc_enable_irq,
+	.disable_irq		= sunix_parport_pc_disable_irq,
+	.data_forward		= sunix_parport_pc_data_forward,
+	.data_reverse		= sunix_parport_pc_data_reverse,
+	.init_state			= sunix_parport_pc_init_state,
+	.save_state			= sunix_parport_pc_save_state,
+	.restore_state		= sunix_parport_pc_restore_state,
+	.epp_write_data		= sunix_parport_ieee1284_epp_write_data,
+	.epp_read_data		= sunix_parport_ieee1284_epp_read_data,
+	.epp_write_addr		= sunix_parport_ieee1284_epp_write_addr,
+	.epp_read_addr		= sunix_parport_ieee1284_epp_read_addr,
+	.ecp_write_data		= sunix_parport_ieee1284_ecp_write_data,
+	.ecp_read_data		= sunix_parport_ieee1284_ecp_read_data,
+	.ecp_write_addr		= sunix_parport_ieee1284_ecp_write_addr,
+	.compat_write_data	= sunix_parport_ieee1284_write_compat,
+	.nibble_read_data	= sunix_parport_ieee1284_read_nibble,
+	.byte_read_data		= sunix_parport_ieee1284_read_byte,
+	.owner				= THIS_MODULE,
+};
+
+
+static int sunix_parport_SPP_supported(struct snx_parport *pb)
+{
+	unsigned char dcr, w;
+
+	sunix_clear_epp_timeout(pb);
+
+	w = 0xc;
+	outb(w, SNX_DCR (pb));
+
+	dcr = inb(SNX_DCR (pb));
+
+	if ((dcr & 0xf) == w) {
+		w = 0xe;
+		outb(w, SNX_DCR (pb));
+		dcr = inb (SNX_DCR (pb));
+		outb(0xc, SNX_DCR (pb));
+
+		if ((dcr & 0xf) == w) {
+			return PARPORT_MODE_PCSPP;
+		}
+	}
+
+	w = 0xaa;
+	sunix_parport_pc_write_data(pb, w);
+
+	dcr = sunix_parport_pc_read_data(pb);
+
+	if (dcr == w) {
+		w = 0x55;
+		sunix_parport_pc_write_data(pb, w);
+		dcr = sunix_parport_pc_read_data(pb);
+
+		if (dcr == w) {
+			return PARPORT_MODE_PCSPP;
+		}
+	}
+
+	return 0;
+}
+
+
+static int sunix_parport_ECR_present(struct snx_parport *pb)
+{
+	struct sunix_par_port *priv = pb->private_data;
+	unsigned char r = 0xc;
+
+	outb(r, SNX_DCR (pb));
+
+	if ((inb(SNX_ECR (pb)) & 0x3) == (r & 0x3)) {
+		outb(r ^ 0x2, SNX_DCR (pb));
+
+		r = inb(SNX_DCR (pb));
+
+		if ((inb(SNX_ECR (pb)) & 0x2) == (r & 0x2)) {
+			goto no_reg;
+		}
+	}
+
+	if ((inb(SNX_ECR (pb)) & 0x3) != 0x1) {
+		goto no_reg;
+	}
+
+	ECR_WRITE(pb, 0x34);
+
+	if (inb(SNX_ECR (pb)) != 0x35) {
+		goto no_reg;
+	}
+
+	priv->ecr = 1;
+	outb(0xc, SNX_DCR (pb));
+
+
+	sunix_frob_set_mode(pb, ECR_SPP);
+
+	return 1;
+
+no_reg:
+	outb(0xc, SNX_DCR (pb));
+	return 0;
+}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 8, 0))
+
+static int  sunix_parport_PS2_supported(struct snx_parport *pb)
+{
+	return 0;
+}
+
+
+static int  sunix_parport_EPP_supported(struct snx_parport *pb)
+{
+	return 0;
+}
+
+
+static int  sunix_parport_ECPEPP_supported(struct snx_parport *pb)
+{
+	return 0;
+}
+
+
+static int  sunix_parport_ECPPS2_supported(struct snx_parport *pb)
+{
+	return 0;
+}
+
+#else
+
+static int __devinit sunix_parport_PS2_supported(struct snx_parport *pb)
+{
+	return 0;
+}
+
+
+static int __devinit sunix_parport_EPP_supported(struct snx_parport *pb)
+{
+	return 0;
+}
+
+
+static int __devinit sunix_parport_ECPEPP_supported(struct snx_parport *pb)
+{
+	return 0;
+}
+
+
+static int __devinit sunix_parport_ECPPS2_supported(struct snx_parport *pb)
+{
+	return 0;
+}
+
+#endif
+
+
+
+
+
+
+
+struct snx_parport *sunix_parport_pc_probe_port(struct sunix_par_port *priv)
+{
+	struct snx_parport_ops *ops = NULL;
+	struct snx_parport *p = NULL;
+	struct resource *base_res;
+	struct resource	*ecr_res = NULL;
+
+	if (!priv) {
+		goto out1;
+	}
+
+	ops = kmalloc(sizeof(struct snx_parport_ops), GFP_KERNEL);
+	if (!ops) {
+		goto out1;
+	}
+
+	p = sunix_parport_register_port(priv, ops);
+	if (!p) {
+		goto out2;
+	}
+
+	base_res = request_region(p->base, SNX_PAR_ADDRESS_LENGTH, "snx_par_base");
+	if (!base_res) {
+		goto out3;
+	}
+
+	memcpy(ops, &sunix_parport_pc_ops, sizeof(struct snx_parport_ops));
+
+	priv->ctr = 0xc;
+	priv->ctr_writable = ~0x10;
+	priv->ecr = 0;
+	priv->fifo_depth = 0;
+	priv->dma_buf = NULL;
+	priv->dma_handle = 0;
+	INIT_LIST_HEAD(&priv->list);
+
+	p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT;
+	p->private_data = priv;
+
+	if (p->base_hi) {
+		ecr_res = request_region(p->base_hi, SNX_PAR_ADDRESS_LENGTH, "snx_par_ehan");
+		if (ecr_res) {
+			sunix_parport_ECR_present(p);
+		}
+
+		if (!sunix_parport_EPP_supported(p)) {
+			sunix_parport_ECPEPP_supported(p);
+		}
+	}
+
+	if (!sunix_parport_SPP_supported(p)) {
+		goto out4;
+	}
+
+	if (priv->ecr) {
+		sunix_parport_ECPPS2_supported(p);
+	} else {
+		sunix_parport_PS2_supported(p);
+	}
+
+	p->size = (p->modes & PARPORT_MODE_EPP)?8:3;
+
+	printk("SNX Info : %s - PC-style at 0x%lx", p->name, p->base);
+	if (p->base_hi && priv->ecr) {
+		printk(" (0x%lx)\n", p->base_hi);
+	}
+
+	if (priv->ecr) {
+		ECR_WRITE(p, 0x34);
+	}
+
+	sunix_parport_pc_write_data(p, 0);
+
+	sunix_parport_pc_data_forward(p);
+
+
+	spin_lock(&snx_ports_lock);
+	list_add(&priv->list, &snx_ports_list);
+	spin_unlock(&snx_ports_lock);
+
+	sunix_parport_announce_port(p);
+
+	return p;
+
+out4:
+	if (ecr_res) {
+		release_region(p->base_hi, SNX_PAR_ADDRESS_LENGTH);
+	}
+
+	release_region(p->base, SNX_PAR_ADDRESS_LENGTH);
+
+out3:
+	sunix_parport_put_port(p);
+
+out2:
+	kfree (ops);
+
+out1:
+	return NULL;
+}
+
+
+void sunix_parport_pc_unregister_port(struct snx_parport *p)
+{
+	struct sunix_par_port *priv = p->private_data;
+	struct snx_parport_ops *ops = p->ops;
+
+	sunix_parport_remove_port(p);
+
+	spin_lock(&snx_ports_lock);
+	list_del_init(&priv->list);
+	spin_unlock(&snx_ports_lock);
+
+	release_region(p->base, SNX_PAR_ADDRESS_LENGTH);
+
+	if (p->base_hi) {
+		release_region(p->base_hi, SNX_PAR_ADDRESS_LENGTH);
+	}
+
+	sunix_parport_put_port(p);
+
+	kfree (ops);
+}
+
+
+int sunix_par_parport_init(void)
+{
+	struct sunix_par_port *pp = NULL;
+    int status = 0;
+	int i;
+
+	for (i = 0; i < SNX_PAR_TOTAL_MAX; i++) {
+		pp = &sunix_par_table[i];
+
+		if ((pp->base > 0) && (pp->chip_flag != SUNNONE_HWID)) {
+			pp->port = sunix_parport_pc_probe_port(pp);
+			if (!pp->port) {
+				status = -ENODEV;
+				break;
+			}
+		}
+
+		if (status != 0) {
+			break;
+		}
+	}
+
+	return status;
+}
+
+
+void sunix_par_parport_exit(void)
+{
+	spin_lock(&snx_ports_lock);
+	while (!list_empty(&snx_ports_list)) {
+		struct sunix_par_port *priv;
+		struct snx_parport *port;
+
+		priv = list_entry(snx_ports_list.next, struct sunix_par_port, list);
+
+		port = priv->port;
+		spin_unlock(&snx_ports_lock);
+		sunix_parport_pc_unregister_port(port);
+		spin_lock(&snx_ports_lock);
+	}
+	spin_unlock(&snx_ports_lock);
+}
+
diff --git a/char/snx/snx_ppdev.c b/char/snx/snx_ppdev.c
new file mode 100644
index 00000000..1e40382f
--- /dev/null
+++ b/char/snx/snx_ppdev.c
@@ -0,0 +1,1209 @@
+#include "snx_ppdev.h"
+
+#define SNX_PARPORT_MAX 4
+#define SNX_CHRDEV "sppdev"
+
+static int SNX_PPD_MAJOR;
+
+struct snx_pp_struct {
+	struct snx_pardevice 	*pdev;
+	wait_queue_head_t 		irq_wait;
+	atomic_t 				irqc;
+	unsigned int 			flags;
+	int 					irqresponse;
+	unsigned char 			irqctl;
+	struct ieee1284_info 	state;
+	struct ieee1284_info 	saved_state;
+	long 					default_inactivity;
+};
+
+
+#define SNX_PP_CLAIMED    (1<<0)
+#define SNX_PP_EXCL       (1<<1)
+
+
+#define SNX_PP_INTERRUPT_TIMEOUT 	(10 * HZ)
+#define SNX_PP_BUFFER_SIZE 			1024
+#define SNX_PARDEVICE_MAX 			SNX_PAR_TOTAL_MAX
+
+
+static inline void snx_pp_enable_irq(struct snx_pp_struct *pp)
+{
+	struct snx_parport *port = pp->pdev->port;
+	port->ops->enable_irq(port);
+}
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+static ssize_t snx_pp_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+#else
+static ssize_t snx_pp_read(struct file *file, char *buf, size_t count, loff_t *ppos)
+#endif
+{
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 19))
+    unsigned int minor = iminor(file->f_path.dentry->d_inode);
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+    unsigned int minor = iminor(file->f_dentry->d_inode);
+#else
+    unsigned int minor = MINOR (file->f_dentry->d_inode->i_rdev);
+#endif
+
+	struct snx_pp_struct *pp = file->private_data;
+	char *kbuffer;
+	ssize_t bytes_read = 0;
+	struct snx_parport *pport;
+	int mode;
+
+	if (!(pp->flags & SNX_PP_CLAIMED)) {
+		printk("SNX Warng: %x claim the port first\n", minor);
+		return -EINVAL;
+	}
+
+	if (count == 0) {
+		return 0;
+	}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 9))
+	kbuffer = kmalloc(min_t(size_t, count, SNX_PP_BUFFER_SIZE), GFP_KERNEL);
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 8))
+	kbuffer = kmalloc(min(size_t, count, SNX_PP_BUFFER_SIZE), GFP_KERNEL);
+#else
+	kbuffer = kmalloc(min(count, SNX_PP_BUFFER_SIZE), GFP_KERNEL);
+#endif
+	if (!kbuffer) {
+		return -ENOMEM;
+	}
+
+	pport = pp->pdev->port;
+	mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
+
+	sunix_parport_set_timeout(pp->pdev, (file->f_flags & O_NONBLOCK) ? SNX_PARPORT_INACTIVITY_O_NONBLOCK : pp->default_inactivity);
+
+	while (bytes_read == 0)	{
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 9))
+		ssize_t need = min_t(unsigned long, count, SNX_PP_BUFFER_SIZE);
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 8))
+		ssize_t need = min(unsigned long, count, SNX_PP_BUFFER_SIZE);
+#else
+		ssize_t need = min(count - bytes_read, SNX_PP_BUFFER_SIZE);
+#endif
+		if (mode == IEEE1284_MODE_EPP) {
+			int flags = 0;
+			size_t (*fn)(struct snx_parport *, void *, size_t, int);
+
+			if (pp->flags & SNX_PP_W91284PIC) {
+				flags |= PARPORT_W91284PIC;
+			}
+
+			if (pp->flags & SNX_PP_FASTREAD) {
+				flags |= PARPORT_EPP_FAST;
+			}
+
+			if (pport->ieee1284.mode & IEEE1284_ADDR) {
+				fn = pport->ops->epp_read_addr;
+			} else {
+				fn = pport->ops->epp_read_data;
+			}
+
+			bytes_read = (*fn)(pport, kbuffer, need, flags);
+		} else {
+			bytes_read = sunix_parport_read(pport, kbuffer, need);
+		}
+
+		if (bytes_read != 0) {
+			break;
+		}
+
+		if (file->f_flags & O_NONBLOCK) {
+			bytes_read = -EAGAIN;
+			break;
+		}
+
+		if (signal_pending(current)) {
+			bytes_read = -ERESTARTSYS;
+			break;
+		}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 19))
+		cond_resched();
+#else
+		if (current->need_resched) {
+			schedule();
+		}
+#endif
+	}
+
+	sunix_parport_set_timeout(pp->pdev, pp->default_inactivity);
+
+	if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read)) {
+		bytes_read = -EFAULT;
+	}
+
+	kfree(kbuffer);
+	snx_pp_enable_irq(pp);
+
+	return bytes_read;
+}
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+static ssize_t snx_pp_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+#else
+static ssize_t snx_pp_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
+#endif
+{
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 19))
+    unsigned int minor = iminor(file->f_path.dentry->d_inode);
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+    unsigned int minor = iminor(file->f_dentry->d_inode);
+#else
+    unsigned int minor = MINOR (file->f_dentry->d_inode->i_rdev);
+#endif
+
+	struct snx_pp_struct *pp = file->private_data;
+	char *kbuffer;
+	ssize_t bytes_written = 0;
+	ssize_t wrote;
+	int mode;
+	struct snx_parport *pport;
+
+	if (!(pp->flags & SNX_PP_CLAIMED)) {
+		printk("SNX Warng: %x claim the port first\n", minor);
+		return -EINVAL;
+	}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 9))
+	kbuffer = kmalloc(min_t(size_t, count, SNX_PP_BUFFER_SIZE), GFP_KERNEL);
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 8))
+	kbuffer = kmalloc(min(size_t, count, SNX_PP_BUFFER_SIZE), GFP_KERNEL);
+#else
+	kbuffer = kmalloc(min(count, SNX_PP_BUFFER_SIZE), GFP_KERNEL);
+#endif
+
+	if (!kbuffer) {
+		return -ENOMEM;
+	}
+
+	pport = pp->pdev->port;
+	mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
+
+	sunix_parport_set_timeout(pp->pdev, (file->f_flags & O_NONBLOCK) ? SNX_PARPORT_INACTIVITY_O_NONBLOCK : pp->default_inactivity);
+
+	while (bytes_written < count) {
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 9))
+		ssize_t n = min_t(unsigned long, count - bytes_written, SNX_PP_BUFFER_SIZE);
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 8))
+		ssize_t n = min(unsigned long, count - bytes_written, SNX_PP_BUFFER_SIZE);
+#else
+		ssize_t n = min(count - bytes_written, SNX_PP_BUFFER_SIZE);
+#endif
+
+		if (copy_from_user(kbuffer, buf + bytes_written, n)) {
+			bytes_written = -EFAULT;
+			break;
+		}
+
+		if ((pp->flags & SNX_PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) {
+			if (pport->ieee1284.mode & IEEE1284_ADDR) {
+				wrote = pport->ops->epp_write_addr(pport, kbuffer, n, PARPORT_EPP_FAST);
+			} else {
+				wrote = pport->ops->epp_write_data(pport, kbuffer, n, PARPORT_EPP_FAST);
+			}
+		} else {
+			wrote = sunix_parport_write(pp->pdev->port, kbuffer, n);
+		}
+
+		if (wrote <= 0) {
+			if (!bytes_written) {
+				bytes_written = wrote;
+			}
+			break;
+		}
+
+		bytes_written += wrote;
+
+		if (file->f_flags & O_NONBLOCK) {
+			if (!bytes_written) {
+				bytes_written = -EAGAIN;
+			}
+			break;
+		}
+
+		if (signal_pending(current)) {
+			if (!bytes_written) {
+				bytes_written = -EINTR;
+			}
+			break;
+		}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 19))
+		cond_resched();
+#else
+		if (current->need_resched) {
+			schedule();
+		}
+#endif
+	}
+
+	sunix_parport_set_timeout(pp->pdev, pp->default_inactivity);
+
+	kfree(kbuffer);
+	snx_pp_enable_irq(pp);
+
+	return bytes_written;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
+static void snx_pp_irq(int irq, void *private, struct pt_regs *nouse)
+{
+	struct snx_pp_struct *pp = (struct snx_pp_struct *) private;
+
+	if (pp->irqresponse) {
+		sunix_parport_write_control(pp->pdev->port, pp->irqctl);
+		pp->irqresponse = 0;
+	}
+
+	atomic_inc(&pp->irqc);
+	wake_up_interruptible(&pp->irq_wait);
+}
+#endif
+
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
+static int snx_register_device(int minor, struct snx_pp_struct *pp)
+{
+	struct snx_parport *port;
+	struct snx_pardevice *pdev = NULL;
+	char *name;
+	int fl;
+
+	name = kmalloc(strlen(SNX_CHRDEV) + 3, GFP_KERNEL);
+	if (name == NULL) {
+		return -ENOMEM;
+	}
+
+	sprintf(name, SNX_CHRDEV "%x", minor);
+
+	port = sunix_parport_find_number(minor);
+	if (!port) {
+		printk("SNX Error: %s no associated port!\n", name);
+		kfree (name);
+		return -ENXIO;
+	}
+
+	fl = (pp->flags & SNX_PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
+
+	pdev = sunix_parport_register_device(port, name, NULL, NULL, snx_pp_irq, fl, (struct snx_pp_struct *)pp);
+
+	sunix_parport_put_port(port);
+
+	if (!pdev) {
+		printk("SNX Error: %s failed to register device!\n", name);
+		kfree (name);
+		return -ENXIO;
+	}
+
+	pp->pdev = pdev;
+	return 0;
+}
+#endif
+
+static enum ieee1284_phase snx_init_phase(int mode)
+{
+		switch (mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR)) {
+		case IEEE1284_MODE_NIBBLE:
+		case IEEE1284_MODE_BYTE:
+			return IEEE1284_PH_REV_IDLE;
+	}
+
+	return IEEE1284_PH_FWD_IDLE;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
+static int snx_pp_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	unsigned int minor = iminor(inode);
+#else
+	unsigned int minor = MINOR(inode->i_rdev);
+#endif
+	struct snx_pp_struct *pp = file->private_data;
+	struct snx_parport *port;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+	void __user *argp = (void __user *)arg;
+#endif
+
+		switch (cmd) {
+		case SNX_PAR_DUMP_PORT_INFO:
+		{
+			struct snx_par_port_info snx_port_info;
+			struct sunix_par_port *sdn = NULL;
+
+			memset(&snx_port_info, 0, (sizeof(struct snx_par_port_info)));
+
+			minor = minor - 2;
+			if (minor >= 0) {
+				sdn = (struct sunix_par_port *) &sunix_par_table[minor];
+
+				memcpy(&snx_port_info.board_name_info[0], &sdn->pb_info.board_name[0], SNX_BOARDNAME_LENGTH);
+
+				snx_port_info.bus_number_info = sdn->bus_number;
+				snx_port_info.dev_number_info = sdn->dev_number;
+				snx_port_info.port_info       = sdn->portnum + 2;
+				snx_port_info.base_info       = sdn->base;
+				snx_port_info.base_hi_info    = sdn->base_hi;
+				snx_port_info.irq_info        = sdn->irq;
+
+				if (copy_to_user((void *)arg, &snx_port_info, sizeof(struct snx_par_port_info))) {
+					return -EFAULT;
+				} else {
+					return 0;
+				}
+			} else {
+				return -ENXIO;
+			}
+		}
+
+		case SNX_PPCLAIM:
+	    {
+			struct ieee1284_info *info;
+			int ret;
+
+			if (pp->flags & SNX_PP_CLAIMED) {
+				printk("SNX Warng: %x you've already got it!\n", minor);
+				return -EINVAL;
+			}
+
+			if (!pp->pdev) {
+				int err = snx_register_device(minor, pp);
+				if (err) {
+					return err;
+				}
+			}
+
+			ret = sunix_parport_claim_or_block(pp->pdev);
+			if (ret < 0) {
+				return ret;
+			}
+
+			pp->flags |= SNX_PP_CLAIMED;
+
+			snx_pp_enable_irq(pp);
+
+			info = &pp->pdev->port->ieee1284;
+			pp->saved_state.mode = info->mode;
+			pp->saved_state.phase = info->phase;
+			info->mode = pp->state.mode;
+			info->phase = pp->state.phase;
+
+			pp->default_inactivity = sunix_parport_set_timeout(pp->pdev, 0);
+
+			sunix_parport_set_timeout(pp->pdev, pp->default_inactivity);
+			return 0;
+	    }
+
+
+		case SNX_PPEXCL:
+		{
+			if (pp->pdev) {
+				printk("SNX Warng: %x too late for SNX_PPEXCL; already registered\n", minor);
+				if (pp->flags & SNX_PP_EXCL) {
+					return 0;
+				}
+				return -EINVAL;
+			}
+
+			pp->flags |= SNX_PP_EXCL;
+			return 0;
+		}
+
+		case SNX_PPSETMODE:
+	    {
+			int mode;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_from_user(&mode, argp, sizeof (mode)))
+#else
+			if (copy_from_user(&mode, (int *)arg, sizeof (mode)))
+#endif
+			{
+				return -EFAULT;
+			}
+			pp->state.mode = mode;
+			pp->state.phase = snx_init_phase(mode);
+
+			if (pp->flags & SNX_PP_CLAIMED) {
+				pp->pdev->port->ieee1284.mode = mode;
+				pp->pdev->port->ieee1284.phase = pp->state.phase;
+			}
+
+			return 0;
+	    }
+
+
+		case SNX_PPGETMODE:
+	    {
+			int mode;
+
+			if (pp->flags & SNX_PP_CLAIMED) {
+				mode = pp->pdev->port->ieee1284.mode;
+			} else {
+				mode = pp->state.mode;
+			}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &mode, sizeof (mode)))
+#else
+			if (copy_to_user((int *)arg, &mode, sizeof (mode)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			return 0;
+	    }
+
+
+		case SNX_PPSETPHASE:
+	    {
+			int phase;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_from_user(&phase, argp, sizeof (phase)))
+#else
+			if (copy_from_user(&phase, (int *) arg, sizeof (phase)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			pp->state.phase = phase;
+
+			if (pp->flags & SNX_PP_CLAIMED) {
+				pp->pdev->port->ieee1284.phase = phase;
+			}
+			return 0;
+	    }
+
+		case SNX_PPGETPHASE:
+	    {
+			int phase;
+
+			if (pp->flags & SNX_PP_CLAIMED) {
+				phase = pp->pdev->port->ieee1284.phase;
+			} else {
+				phase = pp->state.phase;
+			}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &phase, sizeof (phase)))
+#else
+			if (copy_to_user((int *)arg, &phase, sizeof (phase)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			return 0;
+	    }
+
+
+		case SNX_PPGETMODES:
+	    {
+			unsigned int modes;
+
+			port = sunix_parport_find_number(minor);
+			if (!port) {
+				return -ENODEV;
+			}
+
+			modes = port->modes;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &modes, sizeof (modes)))
+#else
+			if (copy_to_user((unsigned int *)arg, &modes, sizeof (port->modes)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			return 0;
+	    }
+
+
+		case SNX_PPSETFLAGS:
+	    {
+			int uflags;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_from_user(&uflags, argp, sizeof (uflags)))
+#else
+			if (copy_from_user(&uflags, (int *)arg, sizeof (uflags)))
+#endif
+			{
+				return -EFAULT;
+			}
+			pp->flags &= ~SNX_PP_FLAGMASK;
+			pp->flags |= (uflags & SNX_PP_FLAGMASK);
+
+			return 0;
+	    }
+
+
+		case SNX_PPGETFLAGS:
+	    {
+			int uflags;
+
+			uflags = pp->flags & SNX_PP_FLAGMASK;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &uflags, sizeof (uflags)))
+#else
+			if (copy_to_user((int *)arg, &uflags, sizeof (uflags)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			return 0;
+	    }
+	}
+
+
+	if ((pp->flags & SNX_PP_CLAIMED) == 0) {
+		printk("SNX Warng: %x claim the port first\n", minor);
+		return -EINVAL;
+	}
+
+
+	port = pp->pdev->port;
+		switch (cmd) {
+		struct ieee1284_info *info;
+		unsigned char reg;
+		unsigned char mask;
+		int mode;
+		int ret;
+		struct timeval par_timeout;
+		long to_jiffies;
+
+		case SNX_PPRSTATUS:
+		{
+			reg = sunix_parport_read_status(port);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &reg, sizeof (reg)))
+#else
+			if (copy_to_user((unsigned char *) arg, &reg, sizeof (reg)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			return 0;
+		}
+
+
+		case SNX_PPRDATA:
+		{
+			reg = sunix_parport_read_data(port);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &reg, sizeof (reg)))
+#else
+			if (copy_to_user((unsigned char *) arg, &reg, sizeof (reg)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			return 0;
+		}
+
+
+		case SNX_PPRCONTROL:
+		{
+			reg = sunix_parport_read_control(port);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &reg, sizeof (reg)))
+#else
+			if (copy_to_user((unsigned char *) arg, &reg, sizeof (reg)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			return 0;
+		}
+
+
+		case SNX_PPYIELD:
+		{
+			sunix_parport_yield_blocking(pp->pdev);
+			return 0;
+		}
+
+		case SNX_PPRELEASE:
+		{
+			info = &pp->pdev->port->ieee1284;
+			pp->state.mode = info->mode;
+			pp->state.phase = info->phase;
+			info->mode = pp->saved_state.mode;
+			info->phase = pp->saved_state.phase;
+
+			sunix_parport_release(pp->pdev);
+
+			pp->flags &= ~SNX_PP_CLAIMED;
+
+			return 0;
+		}
+
+
+		case SNX_PPWCONTROL:
+		{
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_from_user(&reg, argp, sizeof (reg)))
+#else
+			if (copy_from_user(&reg, (unsigned char *) arg, sizeof (reg)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			sunix_parport_write_control(port, reg);
+
+			return 0;
+		}
+
+
+		case SNX_PPWDATA:
+		{
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_from_user(&reg, argp, sizeof (reg)))
+#else
+			if (copy_from_user(&reg, (unsigned char *) arg, sizeof (reg)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			sunix_parport_write_data(port, reg);
+			return 0;
+		}
+
+
+		case SNX_PPFCONTROL:
+		{
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_from_user(&mask, argp, sizeof (mask)))
+#else
+			if (copy_from_user(&mask, (unsigned char *) arg, sizeof (mask)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_from_user(&reg, 1 + (unsigned char __user *) arg, sizeof (reg)))
+#else
+			if (copy_from_user(&reg, 1 + (unsigned char *) arg, sizeof (reg)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			sunix_parport_frob_control(port, mask, reg);
+
+			return 0;
+		}
+
+
+		case SNX_PPDATADIR:
+		{
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_from_user(&mode, argp, sizeof (mode)))
+#else
+			if (copy_from_user(&mode, (int *) arg, sizeof (mode)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			if (mode) {
+				port->ops->data_reverse(port);
+			} else {
+				port->ops->data_forward(port);
+			}
+
+			return 0;
+		}
+
+		case SNX_PPNEGOT:
+		{
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_from_user(&mode, argp, sizeof (mode)))
+#else
+			if (copy_from_user(&mode, (int *) arg, sizeof (mode)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			switch ((ret = sunix_parport_negotiate(port, mode))) {
+			case 0:
+					break;
+
+			case -1:
+					ret = -EIO;
+					break;
+
+			case 1:
+					ret = -ENXIO;
+					break;
+			}
+
+			snx_pp_enable_irq(pp);
+			return ret;
+		}
+
+
+		case SNX_PPWCTLONIRQ:
+		{
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_from_user(&reg, argp, sizeof (reg)))
+#else
+			if (copy_from_user(&reg, (unsigned char *) arg, sizeof (reg)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			pp->irqctl = reg;
+			pp->irqresponse = 1;
+			return 0;
+		}
+
+
+		case SNX_PPCLRIRQ:
+		{
+			ret = atomic_read(&pp->irqc);
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &ret, sizeof (ret)))
+#else
+			if (copy_to_user((int *) arg, &ret, sizeof (ret)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			atomic_sub(ret, &pp->irqc);
+			return 0;
+		}
+
+
+		case SNX_PPSETTIME:
+		{
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_from_user(&par_timeout, argp, sizeof(struct timeval)))
+#else
+			if (copy_from_user(&par_timeout, (struct timeval *)arg, sizeof(struct timeval)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) {
+				return -EINVAL;
+			}
+
+			to_jiffies = SNX_ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
+			to_jiffies += par_timeout.tv_sec * (long)HZ;
+
+			if (to_jiffies <= 0) {
+				return -EINVAL;
+			}
+
+			pp->pdev->timeout = to_jiffies;
+			return 0;
+		}
+
+
+		case SNX_PPGETTIME:
+		{
+			to_jiffies = pp->pdev->timeout;
+			par_timeout.tv_sec = to_jiffies / HZ;
+			par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 26))
+			if (copy_to_user(argp, &par_timeout, sizeof(struct timeval)))
+#else
+			if (copy_to_user((struct timeval *)arg, &par_timeout, sizeof(struct timeval)))
+#endif
+			{
+				return -EFAULT;
+			}
+
+			return 0;
+		}
+
+
+		default:
+		{
+			printk("SNX Error: %x What? (cmd=0x%x)\n", minor, cmd);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+#else
+static long snx_dump_par_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	unsigned int minor = 0;
+
+		switch (cmd) {
+		case SNX_PAR_DUMP_PORT_INFO:
+		{
+			struct snx_par_port_info snx_port_info;
+			struct sunix_par_port *sdn = NULL;
+
+			memset(&snx_port_info, 0, (sizeof(struct snx_par_port_info)));
+
+			if (copy_from_user(&snx_port_info, (void *)arg, (sizeof(struct snx_par_port_info)))) {
+				return -EFAULT;
+			}
+
+			minor = snx_port_info.minor - 2;
+
+			if (minor >= 0) {
+				sdn = (struct sunix_par_port *) &sunix_par_table[minor];
+
+				memcpy(&snx_port_info.board_name_info[0], &sdn->pb_info.board_name[0], SNX_BOARDNAME_LENGTH);
+
+				snx_port_info.bus_number_info = sdn->bus_number;
+				snx_port_info.dev_number_info = sdn->dev_number;
+				snx_port_info.port_info       = sdn->portnum + 2;
+				snx_port_info.base_info       = sdn->base;
+				snx_port_info.base_hi_info    = sdn->base_hi;
+				snx_port_info.irq_info        = sdn->irq;
+
+				if (copy_to_user((void *)arg, &snx_port_info, sizeof(struct snx_par_port_info))) {
+					return -EFAULT;
+				} else {
+					return 0;
+				}
+
+			} else {
+				return -ENXIO;
+			}
+		}
+
+		case SNX_PAR_DUMP_DRIVER_VER:
+		{
+			char driver_ver[SNX_DRIVERVERSION_LENGTH];
+
+			memset(driver_ver, 0, (sizeof(char) * SNX_DRIVERVERSION_LENGTH));
+
+			memcpy(&driver_ver[0], SNX_DRIVER_VERSION, sizeof(SNX_DRIVER_VERSION));
+
+			if (copy_to_user((void *)arg, &driver_ver, (sizeof(char) * SNX_DRIVERVERSION_LENGTH))) {
+				return -EFAULT;
+			} else {
+				return  0;
+			}
+
+			break;
+		}
+	}
+	return 0;
+}
+#endif
+
+static int snx_pp_open(struct inode *inode, struct file *file)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+    unsigned int minor = iminor(inode);
+#else
+	unsigned int minor = MINOR(inode->i_rdev);
+#endif
+
+	struct snx_pp_struct *pp;
+
+	if (minor >= PARPORT_MAX) {
+		return -ENXIO;
+	}
+
+	pp = kmalloc(sizeof(struct snx_pp_struct), GFP_KERNEL);
+	if (!pp) {
+		return -ENOMEM;
+	}
+
+	pp->state.mode = IEEE1284_MODE_COMPAT;
+	pp->state.phase = snx_init_phase(pp->state.mode);
+	pp->flags = 0;
+	pp->irqresponse = 0;
+	atomic_set(&pp->irqc, 0);
+
+	init_waitqueue_head(&pp->irq_wait);
+
+
+	pp->pdev = NULL;
+	file->private_data = pp;
+
+	return 0;
+}
+
+
+static int snx_pp_release(struct inode *inode, struct file *file)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+    unsigned int minor = iminor(inode);
+#else
+	unsigned int minor = MINOR(inode->i_rdev);
+#endif
+	struct snx_pp_struct *pp = file->private_data;
+	int compat_negot;
+
+	compat_negot = 0;
+	if (!(pp->flags & SNX_PP_CLAIMED) && pp->pdev && (pp->state.mode != IEEE1284_MODE_COMPAT)) {
+		struct ieee1284_info *info;
+
+		sunix_parport_claim_or_block(pp->pdev);
+
+		pp->flags |= SNX_PP_CLAIMED;
+		info = &pp->pdev->port->ieee1284;
+		pp->saved_state.mode = info->mode;
+		pp->saved_state.phase = info->phase;
+		info->mode = pp->state.mode;
+		info->phase = pp->state.phase;
+		compat_negot = 1;
+	} else if ((pp->flags & SNX_PP_CLAIMED) && pp->pdev && (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
+		compat_negot = 2;
+	}
+
+	if (compat_negot) {
+		sunix_parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT);
+		printk("SNX Warng: %x negotiated back to compatibility mode because user-space forgot\n", minor);
+	}
+
+
+	if (pp->flags & SNX_PP_CLAIMED) {
+		struct ieee1284_info *info;
+
+		info = &pp->pdev->port->ieee1284;
+		pp->state.mode = info->mode;
+		pp->state.phase = info->phase;
+		info->mode = pp->saved_state.mode;
+		info->phase = pp->saved_state.phase;
+
+		sunix_parport_release(pp->pdev);
+
+		if (compat_negot != 1) {
+			printk("SNX Warng: %x released pardevice because user-space forgot\n", minor);
+		}
+	}
+
+
+	if (pp->pdev) {
+		const char *name = pp->pdev->name;
+		sunix_parport_unregister_device(pp->pdev);
+		kfree(name);
+		pp->pdev = NULL;
+	}
+
+	kfree(pp);
+	return 0;
+}
+
+
+static unsigned int snx_pp_poll(struct file *file, poll_table *wait)
+{
+	struct snx_pp_struct *pp = file->private_data;
+	unsigned int mask = 0;
+
+	poll_wait(file, &pp->irq_wait, wait);
+
+	if (atomic_read(&pp->irqc)) {
+		mask |= POLLIN | POLLRDNORM;
+	}
+	return mask;
+}
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 4, 9))
+static struct file_operations snx_pp_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.read		= snx_pp_read,
+	.write		= snx_pp_write,
+	.poll		= snx_pp_poll,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
+  .ioctl    = snx_pp_ioctl,
+#else
+  .unlocked_ioctl	= snx_dump_par_ioctl,
+#endif
+	.open		= snx_pp_open,
+	.release	= snx_pp_release,
+};
+#else
+static loff_t snx_pp_lseek(struct file *file, long long offset, int origin)
+{
+	return -ESPIPE;
+}
+
+
+static struct file_operations snx_pp_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= snx_pp_lseek,
+	.read		= snx_pp_read,
+	.write		= snx_pp_write,
+	.poll		= snx_pp_poll,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
+  .ioctl    = snx_pp_ioctl,
+#else
+  .unlocked_ioctl	= snx_dump_par_ioctl,
+#endif
+	.open		= snx_pp_open,
+	.release	= snx_pp_release,
+};
+#endif
+
+/*
+static struct file_operations snx_pp_fops =
+{
+	.owner    = THIS_MODULE,
+  .llseek		= snx_pp_lseek,
+  .read     = snx_pp_read,
+  .write    = snx_pp_write,
+  .poll     = snx_pp_poll,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35)
+  .ioctl    = snx_pp_ioctl,
+#else
+  .unlocked_ioctl	= snx_pp_ioctl,
+#endif
+
+#ifdef CONFIG_COMPAT
+  .compat_ioctl   = snx_pp_ioctl,
+#endif
+
+  .open     	= snx_pp_open,
+  .release    = snx_pp_release
+};
+#endif
+*/
+
+
+
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static struct class *snx_ppdev_class;
+
+static void snx_pp_attach(struct snx_parport *port)
+{
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 26))
+	device_create(snx_ppdev_class, NULL, MKDEV(SNX_PPD_MAJOR, port->number), "parport%d", port->number);
+#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 27))
+	device_create_drvdata(snx_ppdev_class, NULL, MKDEV(SNX_PPD_MAJOR, port->number), NULL, "parport%d", port->number);
+#else
+	device_create(snx_ppdev_class, NULL, MKDEV(SNX_PPD_MAJOR, port->number), NULL, "parport%d", port->number);
+#endif
+}
+
+static void snx_pp_detach(struct snx_parport *port)
+{
+	device_destroy(snx_ppdev_class, MKDEV(SNX_PPD_MAJOR, port->number));
+}
+
+static struct snx_parport_driver snx_pp_driver = {
+	.name		= SNX_CHRDEV,
+	.attach		= snx_pp_attach,
+	.detach		= snx_pp_detach,
+};
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+#else
+static devfs_handle_t devfs_handle;
+#endif
+
+
+extern int sunix_par_ppdev_init(void)
+{
+#if ((LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)) && (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17)))
+	int i;
+#endif
+	int err = 0;
+
+	SNX_PPD_MAJOR = register_chrdev(0, SNX_CHRDEV, &snx_pp_fops);
+
+	if (SNX_PPD_MAJOR < 0) {
+		printk("SNX Error: unable to get major \n");
+		return -EIO;
+	}
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
+	devfs_handle = devfs_mk_dir(NULL, "parports", NULL);
+
+	devfs_register_series(devfs_handle,
+							"%u",
+							SNX_PARPORT_MAX,
+							DEVFS_FL_DEFAULT,
+							SNX_PPD_MAJOR,
+							0,
+							S_IFCHR | S_IRUGO | S_IWUGO,
+							&snx_pp_fops,
+							NULL
+							);
+
+#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17))
+	for (i = 2; i < SNX_PARPORT_MAX; i++) {
+		devfs_mk_cdev(MKDEV(SNX_PPD_MAJOR, i), S_IFCHR | S_IRUGO | S_IWUGO, "parports/%d", i);
+	}
+#else
+	snx_ppdev_class = class_create(THIS_MODULE, SNX_CHRDEV);
+	if (IS_ERR(snx_ppdev_class)) {
+		err = PTR_ERR(snx_ppdev_class);
+		goto out_chrdev;
+	}
+
+
+	if (sunix_parport_register_driver(&snx_pp_driver)) {
+		printk("SNX Error: unable to register with parport\n\n");
+		goto out_class;
+	}
+
+	goto out;
+
+out_class:
+	class_destroy(snx_ppdev_class);
+out_chrdev:
+
+	unregister_chrdev(SNX_PPD_MAJOR, SNX_CHRDEV);
+
+out:
+#endif
+
+	return err;
+}
+
+
+extern void sunix_par_ppdev_exit(void)
+{
+#if ((LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)) && (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17)))
+	int i;
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
+	devfs_unregister(devfs_handle);
+	devfs_unregister_chrdev(SNX_PPD_MAJOR, SNX_CHRDEV);
+
+#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 17))
+	for (i = 2; i < SNX_PARPORT_MAX; i++) {
+		devfs_remove("parports/%d", i);
+	}
+	devfs_remove("parports");
+#else
+	sunix_parport_unregister_driver(&snx_pp_driver);
+	class_destroy(snx_ppdev_class);
+#endif
+
+	unregister_chrdev(SNX_PPD_MAJOR, SNX_CHRDEV);
+}
+
diff --git a/char/snx/snx_share.c b/char/snx/snx_share.c
new file mode 100644
index 00000000..30691c4e
--- /dev/null
+++ b/char/snx/snx_share.c
@@ -0,0 +1,974 @@
+#include "snx_common.h"
+
+
+#define SNX_PARPORT_DEFAULT_TIMESLICE	(HZ/5)
+
+
+unsigned long sunix_parport_default_timeslice = SNX_PARPORT_DEFAULT_TIMESLICE;
+int sunix_parport_default_spintime = DEFAULT_SPIN_TIME;
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
+static LIST_HEAD(snx_portlist);
+static DEFINE_SPINLOCK(snx_full_list_lock);
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+static LIST_HEAD(snx_portlist);
+static spinlock_t snx_full_list_lock = SPIN_LOCK_UNLOCKED;
+#else
+//static struct snx_parport *snx_portlist = NULL;
+//static struct snx_parport *snx_portlist_tail = NULL;
+static struct snx_parport *snx_portlist;
+static struct snx_parport *snx_portlist_tail;
+static spinlock_t snx_driverlist_lock = SPIN_LOCK_UNLOCKED;
+//static struct snx_parport_driver *snx_driver_chain = NULL;
+static struct snx_parport_driver *snx_driver_chain;
+#endif
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
+static DEFINE_SPINLOCK(snx_parportlist_lock);
+#else
+static spinlock_t snx_parportlist_lock = SPIN_LOCK_UNLOCKED;
+#endif
+static LIST_HEAD(snx_all_ports);
+static LIST_HEAD(snx_drivers);
+
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
+
+static DECLARE_MUTEX(snx_registration_lock);
+
+#else
+
+static DEFINE_SEMAPHORE(snx_registration_lock);
+
+#endif
+
+
+static void sunix_dead_write_lines(struct snx_parport *p, unsigned char b) {}
+static unsigned char sunix_dead_read_lines(struct snx_parport *p) { return 0; }
+static unsigned char sunix_dead_frob_lines(struct snx_parport *p, unsigned char b,  unsigned char c) {return 0; }
+static void sunix_dead_onearg(struct snx_parport *p) {}
+static void sunix_dead_initstate(struct snx_pardevice *d, struct snx_parport_state *s) {}
+static void sunix_dead_state(struct snx_parport *p, struct snx_parport_state *s) {}
+static size_t sunix_dead_write(struct snx_parport *p, const void *b, size_t l, int f) { return 0; }
+static size_t sunix_dead_read(struct snx_parport *p, void *b, size_t l, int f) { return 0; }
+
+
+static struct snx_parport_ops 	sunix_dead_ops = {
+	.write_data			= sunix_dead_write_lines,
+	.read_data			= sunix_dead_read_lines,
+	.write_control		= sunix_dead_write_lines,
+	.read_control		= sunix_dead_read_lines,
+	.frob_control		= sunix_dead_frob_lines,
+	.read_status		= sunix_dead_read_lines,
+	.enable_irq			= sunix_dead_onearg,
+	.disable_irq		= sunix_dead_onearg,
+	.data_forward		= sunix_dead_onearg,
+	.data_reverse		= sunix_dead_onearg,
+	.init_state			= sunix_dead_initstate,
+	.save_state			= sunix_dead_state,
+	.restore_state		= sunix_dead_state,
+	.epp_write_data		= sunix_dead_write,
+	.epp_read_data		= sunix_dead_read,
+	.epp_write_addr		= sunix_dead_write,
+	.epp_read_addr		= sunix_dead_read,
+	.ecp_write_data		= sunix_dead_write,
+	.ecp_read_data		= sunix_dead_read,
+	.ecp_write_addr		= sunix_dead_write,
+	.compat_write_data	= sunix_dead_write,
+	.nibble_read_data	= sunix_dead_read,
+	.byte_read_data		= sunix_dead_read,
+	.owner				= NULL,
+};
+
+
+static void sunix_attach_driver_chain(struct snx_parport *port)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	struct snx_parport_driver *drv;
+	list_for_each_entry(drv, &snx_drivers, list) drv->attach(port);
+#else
+	struct snx_parport_driver *drv;
+	void (**attach) (struct snx_parport *);
+	int count = 0;
+    int i;
+
+	spin_lock(&snx_driverlist_lock);
+	for (drv = snx_driver_chain; drv; drv = drv->next) {
+		count++;
+	}
+
+	spin_unlock(&snx_driverlist_lock);
+
+	attach = kmalloc(sizeof (void(*)(struct snx_parport *)) * count, GFP_KERNEL);
+
+	if (!attach) {
+		printk("SNX Warng: not enough memory to attach\n");
+		return;
+	}
+
+	spin_lock(&snx_driverlist_lock);
+
+	for (i = 0, drv = snx_driver_chain; drv && i < count; drv = drv->next) {
+		attach[i++] = drv->attach;
+	}
+
+	spin_unlock(&snx_driverlist_lock);
+
+	for (count = 0; count < i; count++) {
+		(*attach[count])(port);
+	}
+
+	kfree (attach);
+#endif
+}
+
+
+static void sunix_detach_driver_chain(struct snx_parport *port)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	struct snx_parport_driver *drv;
+	list_for_each_entry(drv, &snx_drivers, list) drv->detach (port);
+#else
+	struct snx_parport_driver *drv;
+
+	spin_lock(&snx_driverlist_lock);
+	for (drv = snx_driver_chain; drv; drv = drv->next) {
+		drv->detach(port);
+	}
+
+	spin_unlock(&snx_driverlist_lock);
+#endif
+}
+
+
+int sunix_parport_register_driver(struct snx_parport_driver *drv)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	struct snx_parport *port;
+
+	down(&snx_registration_lock);
+
+	list_for_each_entry(port, &snx_portlist, list) drv->attach(port);
+	list_add(&drv->list, &snx_drivers);
+
+	up(&snx_registration_lock);
+
+	return 0;
+#else
+	struct snx_parport *port;
+	struct snx_parport **ports;
+	int count = 0;
+	int i;
+
+	spin_lock(&snx_parportlist_lock);
+
+	for (port = snx_portlist; port; port = port->next) {
+		count++;
+	}
+
+	spin_unlock(&snx_parportlist_lock);
+
+	ports = kmalloc(sizeof(struct snx_parport *) * count, GFP_KERNEL);
+
+	if (!ports) {
+		printk("SNX Warng: not enough memory to attach\n");
+	} else {
+		spin_lock(&snx_parportlist_lock);
+
+		for (i = 0, port = snx_portlist; port && i < count; port = port->next) {
+			ports[i++] = port;
+		}
+
+		spin_unlock(&snx_parportlist_lock);
+
+		for (count = 0; count < i; count++) {
+			drv->attach(ports[count]);
+		}
+
+		kfree(ports);
+	}
+
+	spin_lock(&snx_driverlist_lock);
+
+	drv->next = snx_driver_chain;
+	snx_driver_chain = drv;
+
+	spin_unlock(&snx_driverlist_lock);
+
+	return 0;
+#endif
+}
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+void sunix_parport_unregister_driver(struct snx_parport_driver *drv)
+{
+	struct snx_parport *port;
+
+	down(&snx_registration_lock);
+
+	list_del_init(&drv->list);
+	list_for_each_entry(port, &snx_portlist, list) drv->detach(port);
+
+	up(&snx_registration_lock);
+}
+#else
+void sunix_parport_unregister_driver(struct snx_parport_driver *arg)
+{
+	struct snx_parport_driver *drv = snx_driver_chain;
+    struct snx_parport_driver *olddrv = NULL;
+
+	while (drv) {
+		if (drv == arg) {
+			struct snx_parport *port;
+
+			spin_lock(&snx_driverlist_lock);
+			if (olddrv) {
+				olddrv->next = drv->next;
+			} else {
+				snx_driver_chain = drv->next;
+			}
+
+			spin_unlock(&snx_driverlist_lock);
+
+			spin_lock(&snx_parportlist_lock);
+
+			for (port = snx_portlist; port; port = port->next) {
+				drv->detach(port);
+			}
+
+			spin_unlock(&snx_parportlist_lock);
+
+			return;
+		}
+		olddrv = drv;
+		drv = drv->next;
+	}
+}
+#endif
+
+
+static void sunix_free_port(struct snx_parport *port)
+{
+	int d;
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	spin_lock(&snx_full_list_lock);
+	list_del(&port->full_list);
+	spin_unlock(&snx_full_list_lock);
+
+	for (d = 0; d < 5; d++) {
+		kfree(port->probe_info[d].class_name);
+		kfree(port->probe_info[d].mfr);
+		kfree(port->probe_info[d].model);
+		kfree(port->probe_info[d].cmdset);
+		kfree(port->probe_info[d].description);
+	}
+#else
+
+	for (d = 0; d < 5; d++) {
+		if (port->probe_info[d].class_name) {
+			kfree (port->probe_info[d].class_name);
+		}
+
+		if (port->probe_info[d].mfr) {
+			kfree (port->probe_info[d].mfr);
+		}
+
+		if (port->probe_info[d].model) {
+			kfree (port->probe_info[d].model);
+		}
+
+		if (port->probe_info[d].cmdset) {
+			kfree (port->probe_info[d].cmdset);
+		}
+
+		if (port->probe_info[d].description) {
+			kfree (port->probe_info[d].description);
+		}
+	}
+#endif
+
+	kfree(port->name);
+	kfree(port);
+}
+
+
+struct snx_parport *sunix_parport_get_port(struct snx_parport *port)
+{
+	atomic_inc(&port->ref_count);
+	return port;
+}
+
+
+void sunix_parport_put_port(struct snx_parport *port)
+{
+	if (atomic_dec_and_test(&port->ref_count)) {
+		sunix_free_port(port);
+	}
+	return;
+}
+
+
+struct snx_parport *sunix_parport_register_port(struct sunix_par_port *priv,  struct snx_parport_ops *ops)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	struct list_head *l = NULL;
+#endif
+	struct snx_parport *tmp = NULL;
+	int num;
+	int device;
+	char *name;
+
+	if ((!priv) || (!ops)) {
+		return NULL;
+	}
+
+	tmp = kmalloc(sizeof(struct snx_parport), GFP_KERNEL);
+
+	if (!tmp) {
+		return NULL;
+	}
+
+
+	memset(tmp, 0, sizeof(struct snx_parport));
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	tmp->base = priv->base;
+	tmp->irq = priv->irq;
+
+	tmp->base_hi = priv->base_hi;
+
+	tmp->muxport = tmp->daisy = tmp->muxsel = -1;
+	tmp->modes = 0;
+
+	INIT_LIST_HEAD(&tmp->list);
+
+	tmp->devices = tmp->cad = NULL;
+	tmp->flags = 0;
+	tmp->ops = ops;
+	tmp->physport = tmp;
+
+	memset(tmp->probe_info, 0, 5 * sizeof (struct snx_parport_device_info));
+
+	rwlock_init(&tmp->cad_lock);
+	spin_lock_init(&tmp->waitlist_lock);
+	spin_lock_init(&tmp->pardevice_lock);
+	tmp->ieee1284.mode = IEEE1284_MODE_COMPAT;
+	tmp->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37))
+			sema_init(&tmp->ieee1284.irq, 0);
+#else
+			init_MUTEX_LOCKED(&tmp->ieee1284.irq);
+#endif
+
+
+	tmp->spintime = sunix_parport_default_spintime;
+
+	atomic_set(&tmp->ref_count, 1);
+
+	INIT_LIST_HEAD(&tmp->full_list);
+
+	name = kmalloc(20, GFP_KERNEL);
+	if (!name) {
+		return NULL;
+	}
+
+	spin_lock(&snx_full_list_lock);
+
+	for (l = snx_all_ports.next, num = 2; l != &snx_all_ports; l = l->next, num++) {
+		struct snx_parport *p = list_entry(l, struct snx_parport, full_list);
+
+		if (p->number != num) {
+			break;
+		}
+	}
+
+	tmp->portnum = tmp->number = num;
+
+	list_add_tail(&tmp->full_list, l);
+
+	spin_unlock(&snx_full_list_lock);
+
+
+	sprintf(name, "parport%d", tmp->portnum = tmp->number);
+	tmp->name = name;
+
+	for (device = 0; device < 5; device++) {
+		tmp->probe_info[device].class = PARPORT_CLASS_LEGACY;
+	}
+
+	tmp->waithead = tmp->waittail = NULL;
+#else
+
+	spin_lock_irq(&snx_parportlist_lock);
+	for (num = 2; ; num++) {
+		struct snx_parport *itr = snx_portlist;
+		while (itr) {
+			if (itr->number == num) {
+				break;
+			} else {
+				itr = itr->next;
+			}
+		}
+
+		if (itr == NULL) {
+			break;
+		}
+	}
+
+	spin_unlock_irq(&snx_parportlist_lock);
+
+	tmp->base = priv->base;
+	tmp->irq = priv->irq;
+	tmp->base_hi = priv->base_hi;
+
+	tmp->muxport = tmp->daisy = tmp->muxsel = -1;
+	tmp->modes = 0;
+	tmp->next = NULL;
+	tmp->devices = tmp->cad = NULL;
+	tmp->flags = 0;
+	tmp->ops = ops;
+	tmp->portnum = tmp->number = num;
+	tmp->physport = tmp;
+
+	memset (tmp->probe_info, 0, 5 * sizeof (struct snx_parport_device_info));
+
+	tmp->cad_lock = RW_LOCK_UNLOCKED;
+	spin_lock_init(&tmp->waitlist_lock);
+	spin_lock_init(&tmp->pardevice_lock);
+	tmp->ieee1284.mode = IEEE1284_MODE_COMPAT;
+	tmp->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37))
+			sema_init(&tmp->ieee1284.irq, 0);
+#else
+			init_MUTEX_LOCKED (&tmp->ieee1284.irq);
+#endif
+
+	tmp->spintime = sunix_parport_default_spintime;
+
+	atomic_set(&tmp->ref_count, 1);
+
+	name = kmalloc(20, GFP_KERNEL);
+	if (!name) {
+		kfree(tmp);
+		return NULL;
+	}
+
+	sprintf(name, "parport%d", num);
+	tmp->name = name;
+
+	spin_lock(&snx_parportlist_lock);
+
+	if (snx_portlist_tail) {
+		snx_portlist_tail->next = tmp;
+    }
+
+	snx_portlist_tail = tmp;
+
+	if (!snx_portlist) {
+		snx_portlist = tmp;
+    }
+	spin_unlock(&snx_parportlist_lock);
+
+	for (device = 0; device < 5; device++) {
+		tmp->probe_info[device].class = PARPORT_CLASS_LEGACY;
+	}
+
+	tmp->waithead = tmp->waittail = NULL;
+#endif
+
+	return tmp;
+}
+
+
+void sunix_parport_announce_port(struct snx_parport *port)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	int i;
+
+	down(&snx_registration_lock);
+
+	spin_lock_irq(&snx_parportlist_lock);
+
+	list_add_tail(&port->list, &snx_portlist);
+
+	for (i = 1; i < 3; i++) {
+		struct snx_parport *slave = port->slaves[i-1];
+
+		if (slave) {
+			list_add_tail(&slave->list, &snx_portlist);
+		}
+	}
+	spin_unlock_irq(&snx_parportlist_lock);
+
+	sunix_attach_driver_chain(port);
+
+	for (i = 1; i < 3; i++) {
+		struct snx_parport *slave = port->slaves[i-1];
+
+		if (slave) {
+			sunix_attach_driver_chain(slave);
+		}
+	}
+
+	up(&snx_registration_lock);
+#else
+
+   sunix_attach_driver_chain(port);
+#endif
+}
+
+
+void sunix_parport_remove_port(struct snx_parport *port)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	int i;
+
+	down(&snx_registration_lock);
+
+	sunix_detach_driver_chain(port);
+
+	port->ops = &sunix_dead_ops;
+	spin_lock(&snx_parportlist_lock);
+	list_del_init(&port->list);
+
+	for (i = 1; i < 3; i++) {
+		struct snx_parport *slave = port->slaves[i-1];
+		if (slave) {
+			list_del_init(&slave->list);
+		}
+	}
+
+	spin_unlock(&snx_parportlist_lock);
+
+	up(&snx_registration_lock);
+
+	for (i = 1; i < 3; i++) {
+		struct snx_parport *slave = port->slaves[i-1];
+		if (slave) {
+			sunix_parport_put_port(slave);
+		}
+	}
+
+#else
+
+	struct snx_parport *p;
+
+	port->ops = &sunix_dead_ops;
+
+	sunix_detach_driver_chain(port);
+
+	spin_lock(&snx_parportlist_lock);
+
+	if (snx_portlist == port) {
+		//if ((snx_portlist = port->next) == NULL) {
+		snx_portlist = port->next;
+		if (snx_portlist == NULL) {
+			snx_portlist_tail = NULL;
+		}
+	} else {
+		for (p = snx_portlist; (p != NULL) && (p->next != port); p = p->next)
+		;
+			if (p) {
+				//if ((p->next = port->next) == NULL) {
+					p->next = port->next;
+					if (p->next == NULL) {
+						snx_portlist_tail = p;
+				}
+			} else {
+				printk("SNX Warng: %s not found in port list!\n", port->name);
+			}
+		}
+	spin_unlock(&snx_parportlist_lock);
+
+	sunix_parport_put_port(port);
+#endif
+}
+
+
+struct snx_pardevice *sunix_parport_register_device(
+	struct snx_parport 	*port,
+	const char 			*name,
+	int 				(*pf)(void *),
+	void 				(*kf)(void *),
+	void 				(*irq_func)(int, void *, struct pt_regs *),
+	int 				flags,
+	void 				*handle
+	)
+{
+	struct snx_pardevice *tmp;
+
+	if (port->physport->flags & PARPORT_FLAG_EXCL) {
+		printk("SNX Warng: %s no more devices allowed\n",	port->name);
+		return NULL;
+	}
+
+	if (flags & PARPORT_DEV_LURK) {
+		if (!pf || !kf) {
+			printk("SNX Error: %s refused to register lurking device (%s) without callbacks\n", port->name, name);
+			return NULL;
+		}
+	}
+
+	sunix_parport_get_port(port);
+
+	tmp = kmalloc(sizeof(struct snx_pardevice), GFP_KERNEL);
+	if (tmp == NULL) {
+		printk("SNX Error: %s memory squeeze, couldn't register %s.\n", port->name, name);
+		goto out;
+	}
+
+	tmp->state = kmalloc(sizeof(struct snx_parport_state), GFP_KERNEL);
+	if (tmp->state == NULL) {
+		printk("SNX Error: %s memory squeeze, couldn't register %s.\n", port->name, name);
+		goto out_free_pardevice;
+	}
+
+	tmp->name = name;
+	tmp->port = port;
+	tmp->daisy = -1;
+	tmp->preempt = pf;
+	tmp->wakeup = kf;
+	tmp->private = handle;
+	tmp->flags = flags;
+	tmp->irq_func = irq_func;
+	tmp->waiting = 0;
+	tmp->timeout = 5 * HZ;
+
+	tmp->prev = NULL;
+
+	spin_lock(&port->physport->pardevice_lock);
+
+	if (flags & PARPORT_DEV_EXCL) {
+		if (port->physport->devices) {
+			spin_unlock(&port->physport->pardevice_lock);
+			printk("SNX Error: %s cannot grant exclusive access for device %s\n", port->name, name);
+			goto out_free_all;
+		}
+		port->flags |= PARPORT_FLAG_EXCL;
+	}
+
+	tmp->next = port->physport->devices;
+	wmb();
+
+	if (port->physport->devices) {
+		port->physport->devices->prev = tmp;
+	}
+
+	port->physport->devices = tmp;
+	spin_unlock(&port->physport->pardevice_lock);
+
+	init_waitqueue_head(&tmp->wait_q);
+	tmp->timeslice = sunix_parport_default_timeslice;
+	tmp->waitnext = tmp->waitprev = NULL;
+
+	port->ops->init_state(tmp, tmp->state);
+	return tmp;
+
+out_free_all:
+	kfree(tmp->state);
+
+out_free_pardevice:
+	kfree(tmp);
+
+out:
+	sunix_parport_put_port(port);
+
+	return NULL;
+}
+
+
+void sunix_parport_unregister_device(struct snx_pardevice *dev)
+{
+	struct snx_parport *port;
+
+	if (dev == NULL) {
+		return;
+	}
+
+	port = dev->port->physport;
+
+	if (port->cad == dev) {
+		printk("SNX Warng: %s, %s forgot to release port\n", port->name, dev->name);
+		sunix_parport_release(dev);
+	}
+
+	spin_lock(&port->pardevice_lock);
+	if (dev->next) {
+		dev->next->prev = dev->prev;
+	}
+
+	if (dev->prev) {
+		dev->prev->next = dev->next;
+	} else {
+		port->devices = dev->next;
+	}
+
+	if (dev->flags & PARPORT_DEV_EXCL) {
+		port->flags &= ~PARPORT_FLAG_EXCL;
+	}
+
+	spin_unlock(&port->pardevice_lock);
+
+	spin_lock (&port->waitlist_lock);
+	if (dev->waitprev || dev->waitnext || port->waithead == dev) {
+		if (dev->waitprev) {
+			dev->waitprev->waitnext = dev->waitnext;
+		} else {
+			port->waithead = dev->waitnext;
+		}
+
+
+		if (dev->waitnext) {
+			dev->waitnext->waitprev = dev->waitprev;
+		} else {
+			port->waittail = dev->waitprev;
+		}
+	}
+
+	spin_unlock(&port->waitlist_lock);
+
+	kfree(dev->state);
+	kfree(dev);
+
+	sunix_parport_put_port(port);
+}
+
+
+struct snx_parport *sunix_parport_find_number(int number)
+{
+	struct snx_parport *port, *result = NULL;
+
+	spin_lock(&snx_parportlist_lock);
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	list_for_each_entry(port, &snx_portlist, list) {
+		if (port->number == number) {
+			result = sunix_parport_get_port(port);
+			break;
+		}
+	}
+#else
+	for (port = snx_portlist; port; port = port->next) {
+		if (port->number == number) {
+			result = sunix_parport_get_port(port);
+			break;
+		}
+    }
+
+#endif
+	spin_unlock(&snx_parportlist_lock);
+	return result;
+}
+
+
+struct snx_parport *sunix_parport_find_base(unsigned long base)
+{
+	struct snx_parport *port, *result = NULL;
+
+	spin_lock(&snx_parportlist_lock);
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
+	list_for_each_entry(port, &snx_portlist, list) {
+		if (port->base == base) {
+			result = sunix_parport_get_port(port);
+			break;
+		}
+	}
+#else
+	for (port = snx_portlist; port; port = port->next) {
+		if (port->base == base) {
+			result = sunix_parport_get_port(port);
+			break;
+		}
+    }
+#endif
+	spin_unlock(&snx_parportlist_lock);
+
+	return result;
+}
+
+
+int sunix_parport_claim(struct snx_pardevice *dev)
+{
+	struct snx_pardevice *oldcad;
+	struct snx_parport *port = dev->port->physport;
+	unsigned long flags;
+
+	if (port->cad == dev) {
+		printk("SNX Info : %s, %s already owner\n", dev->port->name, dev->name);
+		return 0;
+	}
+
+	write_lock_irqsave(&port->cad_lock, flags);
+	//if ((oldcad = port->cad) != NULL) {
+	oldcad = port->cad;
+	if (oldcad != NULL) {
+		if (oldcad->preempt) {
+			if (oldcad->preempt(oldcad->private)) {
+				goto blocked;
+			}
+
+			port->ops->save_state(port, dev->state);
+		} else {
+			goto blocked;
+		}
+
+		if (port->cad != oldcad) {
+			printk("SNX Error: %s, %s released port when preempted!\n", port->name, oldcad->name);
+			if (port->cad) {
+				goto blocked;
+			}
+		}
+	}
+
+	if (dev->waiting & 1) {
+		dev->waiting = 0;
+
+		spin_lock_irq(&port->waitlist_lock);
+
+		if (dev->waitprev) {
+			dev->waitprev->waitnext = dev->waitnext;
+		} else {
+			port->waithead = dev->waitnext;
+		}
+
+
+		if (dev->waitnext) {
+			dev->waitnext->waitprev = dev->waitprev;
+		} else {
+			port->waittail = dev->waitprev;
+		}
+
+		spin_unlock_irq(&port->waitlist_lock);
+		dev->waitprev = dev->waitnext = NULL;
+	}
+
+	port->cad = dev;
+
+	port->ops->restore_state(port, dev->state);
+	write_unlock_irqrestore(&port->cad_lock, flags);
+	dev->time = jiffies;
+
+	return 0;
+
+blocked:
+	if (dev->waiting & 2 || dev->wakeup) {
+		spin_lock (&port->waitlist_lock);
+		if (test_and_set_bit(0, &dev->waiting) == 0) {
+			dev->waitnext = NULL;
+			dev->waitprev = port->waittail;
+			if (port->waittail) {
+				port->waittail->waitnext = dev;
+				port->waittail = dev;
+			} else {
+				port->waithead = port->waittail = dev;
+			}
+		}
+
+		spin_unlock(&port->waitlist_lock);
+	}
+
+	write_unlock_irqrestore(&port->cad_lock, flags);
+	return -EAGAIN;
+}
+
+
+int sunix_parport_claim_or_block(struct snx_pardevice *dev)
+{
+	int r;
+	dev->waiting = 2;
+
+	r = sunix_parport_claim(dev);
+
+	if (r == -EAGAIN) {
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
+		unsigned long flags;
+#endif
+		printk("SNX Warng: %s sunix_parport_claim() returned -EAGAIN\n", dev->name);
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
+		save_flags (flags);
+		cli();
+#endif
+		if (dev->waiting) {
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0))
+					wait_event_interruptible(dev->wait_q, !dev->waiting);
+#else
+					interruptible_sleep_on(&dev->wait_q);
+#endif
+
+			if (signal_pending(current)) {
+				return -EINTR;
+			}
+			r = 1;
+		} else {
+			r = 0;
+			printk("SNX Warng: %s, didn't sleep in sunix_parport_claim_or_block()\n", dev->name);
+		}
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
+		restore_flags(flags);
+#endif
+		if (dev->port->physport->cad != dev) {
+			printk("SNX Warng: %s, exiting sunix_parport_claim_or_block but %s owns port!\n",
+					dev->name,
+					dev->port->physport->cad ? dev->port->physport->cad->name:"nobody"
+					);
+		}
+	}
+	dev->waiting = 0;
+
+	return r;
+}
+
+
+void sunix_parport_release(struct snx_pardevice *dev)
+{
+	struct snx_parport *port = dev->port->physport;
+	struct snx_pardevice *pd;
+	unsigned long flags;
+
+	write_lock_irqsave(&port->cad_lock, flags);
+	if (port->cad != dev) {
+		write_unlock_irqrestore(&port->cad_lock, flags);
+		printk("SNX Warng: %s, %s tried to release parport when not owner\n", port->name, dev->name);
+		return;
+	}
+
+	port->cad = NULL;
+	write_unlock_irqrestore(&port->cad_lock, flags);
+
+	port->ops->save_state(port, dev->state);
+
+	for (pd = port->waithead; pd; pd = pd->waitnext) {
+		if (pd->waiting & 2) {
+			sunix_parport_claim(pd);
+			if (waitqueue_active(&pd->wait_q)) {
+				wake_up_interruptible(&pd->wait_q);
+			}
+
+			return;
+		} else if (pd->wakeup) {
+			pd->wakeup(pd->private);
+			if (dev->port->cad) {
+				return;
+			}
+		} else {
+			printk("SNX Warng: %s don't know how to wake %s\n", port->name, pd->name);
+		}
+	}
+
+	for (pd = port->devices; (port->cad == NULL) && pd; pd = pd->next) {
+		if (pd->wakeup && pd != dev) {
+			pd->wakeup(pd->private);
+		}
+	}
+}
+
-- 
2.17.1

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