Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 995 insertions, 0 deletions

diff --git a/drivers/char/lp.c b/drivers/char/lp.c
new file mode 100644
index 000000000000..4dee945031d4
--- /dev/null
+++ b/drivers/char/lp.c
@@ -0,0 +1,995 @@
+/*
+ * Generic parallel printer driver
+ *
+ * Copyright (C) 1992 by Jim Weigand and Linus Torvalds
+ * Copyright (C) 1992,1993 by Michael K. Johnson
+ * - Thanks much to Gunter Windau for pointing out to me where the error
+ *   checking ought to be.
+ * Copyright (C) 1993 by Nigel Gamble (added interrupt code)
+ * Copyright (C) 1994 by Alan Cox (Modularised it)
+ * LPCAREFUL, LPABORT, LPGETSTATUS added by Chris Metcalf, metcalf@lcs.mit.edu
+ * Statistics and support for slow printers by Rob Janssen, rob@knoware.nl
+ * "lp=" command line parameters added by Grant Guenther, grant@torque.net
+ * lp_read (Status readback) support added by Carsten Gross,
+ *                                             carsten@sol.wohnheim.uni-ulm.de
+ * Support for parport by Philip Blundell <philb@gnu.org>
+ * Parport sharing hacking by Andrea Arcangeli
+ * Fixed kernel_(to/from)_user memory copy to check for errors
+ *                              by Riccardo Facchetti <fizban@tin.it>
+ * 22-JAN-1998  Added support for devfs  Richard Gooch <rgooch@atnf.csiro.au>
+ * Redesigned interrupt handling for handle printers with buggy handshake
+ *                              by Andrea Arcangeli, 11 May 1998
+ * Full efficient handling of printer with buggy irq handshake (now I have
+ * understood the meaning of the strange handshake). This is done sending new
+ * characters if the interrupt is just happened, even if the printer say to
+ * be still BUSY. This is needed at least with Epson Stylus Color. To enable
+ * the new TRUST_IRQ mode read the `LP OPTIMIZATION' section below...
+ * Fixed the irq on the rising edge of the strobe case.
+ * Obsoleted the CAREFUL flag since a printer that doesn' t work with
+ * CAREFUL will block a bit after in lp_check_status().
+ *                              Andrea Arcangeli, 15 Oct 1998
+ * Obsoleted and removed all the lowlevel stuff implemented in the last
+ * month to use the IEEE1284 functions (that handle the _new_ compatibilty
+ * mode fine).
+ */
+
+/* This driver should, in theory, work with any parallel port that has an
+ * appropriate low-level driver; all I/O is done through the parport
+ * abstraction layer.
+ *
+ * If this driver is built into the kernel, you can configure it using the
+ * kernel command-line.  For example:
+ *
+ *      lp=parport1,none,parport2       (bind lp0 to parport1, disable lp1 and
+ *                                       bind lp2 to parport2)
+ *
+ *      lp=auto                         (assign lp devices to all ports that
+ *                                       have printers attached, as determined
+ *                                       by the IEEE-1284 autoprobe)
+ * 
+ *      lp=reset                        (reset the printer during 
+ *                                       initialisation)
+ *
+ *      lp=off                          (disable the printer driver entirely)
+ *
+ * If the driver is loaded as a module, similar functionality is available
+ * using module parameters.  The equivalent of the above commands would be:
+ *
+ *      # insmod lp.o parport=1,none,2
+ *
+ *      # insmod lp.o parport=auto
+ *
+ *      # insmod lp.o reset=1
+ */
+
+/* COMPATIBILITY WITH OLD KERNELS
+ *
+ * Under Linux 2.0 and previous versions, lp devices were bound to ports at
+ * particular I/O addresses, as follows:
+ *
+ *      lp0             0x3bc
+ *      lp1             0x378
+ *      lp2             0x278
+ *
+ * The new driver, by default, binds lp devices to parport devices as it
+ * finds them.  This means that if you only have one port, it will be bound
+ * to lp0 regardless of its I/O address.  If you need the old behaviour, you
+ * can force it using the parameters described above.
+ */
+
+/*
+ * The new interrupt handling code take care of the buggy handshake
+ * of some HP and Epson printer:
+ * ___
+ * ACK    _______________    ___________
+ *                       |__|
+ * ____
+ * BUSY   _________              _______
+ *                 |____________|
+ *
+ * I discovered this using the printer scanner that you can find at:
+ *
+ *      ftp://e-mind.com/pub/linux/pscan/
+ *
+ *                                      11 May 98, Andrea Arcangeli
+ *
+ * My printer scanner run on an Epson Stylus Color show that such printer
+ * generates the irq on the _rising_ edge of the STROBE. Now lp handle
+ * this case fine too.
+ *
+ *                                      15 Oct 1998, Andrea Arcangeli
+ *
+ * The so called `buggy' handshake is really the well documented
+ * compatibility mode IEEE1284 handshake. They changed the well known
+ * Centronics handshake acking in the middle of busy expecting to not
+ * break drivers or legacy application, while they broken linux lp
+ * until I fixed it reverse engineering the protocol by hand some
+ * month ago...
+ *
+ *                                     14 Dec 1998, Andrea Arcangeli
+ *
+ * Copyright (C) 2000 by Tim Waugh (added LPSETTIMEOUT ioctl)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/slab.h>
+#include <linux/fcntl.h>
+#include <linux/delay.h>
+#include <linux/poll.h>
+#include <linux/console.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+
+#include <linux/parport.h>
+#undef LP_STATS
+#include <linux/lp.h>
+
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+/* if you have more than 8 printers, remember to increase LP_NO */
+#define LP_NO 8
+
+/* ROUND_UP macro from fs/select.c */
+#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
+
+static struct lp_struct lp_table[LP_NO];
+
+static unsigned int lp_count = 0;
+static struct class_simple *lp_class;
+
+#ifdef CONFIG_LP_CONSOLE
+static struct parport *console_registered; // initially NULL
+#endif /* CONFIG_LP_CONSOLE */
+
+#undef LP_DEBUG
+
+/* Bits used to manage claiming the parport device */
+#define LP_PREEMPT_REQUEST 1
+#define LP_PARPORT_CLAIMED 2
+
+/* --- low-level port access ----------------------------------- */
+
+#define r_dtr(x)        (parport_read_data(lp_table[(x)].dev->port))
+#define r_str(x)        (parport_read_status(lp_table[(x)].dev->port))
+#define w_ctr(x,y)      do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
+#define w_dtr(x,y)      do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
+
+/* Claim the parport or block trying unless we've already claimed it */
+static void lp_claim_parport_or_block(struct lp_struct *this_lp)
+{
+        if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
+                parport_claim_or_block (this_lp->dev);
+        }
+}
+
+/* Claim the parport or block trying unless we've already claimed it */
+static void lp_release_parport(struct lp_struct *this_lp)
+{
+        if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
+                parport_release (this_lp->dev);
+        }
+}
+
+
+
+static int lp_preempt(void *handle)
+{
+        struct lp_struct *this_lp = (struct lp_struct *)handle;
+        set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
+        return (1);
+}
+
+
+/* 
+ * Try to negotiate to a new mode; if unsuccessful negotiate to
+ * compatibility mode.  Return the mode we ended up in.
+ */
+static int lp_negotiate(struct parport * port, int mode)
+{
+        if (parport_negotiate (port, mode) != 0) {
+                mode = IEEE1284_MODE_COMPAT;
+                parport_negotiate (port, mode);
+        }
+
+        return (mode);
+}
+
+static int lp_reset(int minor)
+{
+        int retval;
+        lp_claim_parport_or_block (&lp_table[minor]);
+        w_ctr(minor, LP_PSELECP);
+        udelay (LP_DELAY);
+        w_ctr(minor, LP_PSELECP | LP_PINITP);
+        retval = r_str(minor);
+        lp_release_parport (&lp_table[minor]);
+        return retval;
+}
+
+static void lp_error (int minor)
+{
+        DEFINE_WAIT(wait);
+        int polling;
+
+        if (LP_F(minor) & LP_ABORT)
+                return;
+
+        polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
+        if (polling) lp_release_parport (&lp_table[minor]);
+        prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
+        schedule_timeout(LP_TIMEOUT_POLLED);
+        finish_wait(&lp_table[minor].waitq, &wait);
+        if (polling) lp_claim_parport_or_block (&lp_table[minor]);
+        else parport_yield_blocking (lp_table[minor].dev);
+}
+
+static int lp_check_status(int minor)
+{
+        int error = 0;
+        unsigned int last = lp_table[minor].last_error;
+        unsigned char status = r_str(minor);
+        if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
+                /* No error. */
+                last = 0;
+        else if ((status & LP_POUTPA)) {
+                if (last != LP_POUTPA) {
+                        last = LP_POUTPA;
+                        printk(KERN_INFO "lp%d out of paper\n", minor);
+                }
+                error = -ENOSPC;
+        } else if (!(status & LP_PSELECD)) {
+                if (last != LP_PSELECD) {
+                        last = LP_PSELECD;
+                        printk(KERN_INFO "lp%d off-line\n", minor);
+                }
+                error = -EIO;
+        } else if (!(status & LP_PERRORP)) {
+                if (last != LP_PERRORP) {
+                        last = LP_PERRORP;
+                        printk(KERN_INFO "lp%d on fire\n", minor);
+                }
+                error = -EIO;
+        } else {
+                last = 0; /* Come here if LP_CAREFUL is set and no
+                             errors are reported. */
+        }
+
+        lp_table[minor].last_error = last;
+
+        if (last != 0)
+                lp_error(minor);
+
+        return error;
+}
+
+static int lp_wait_ready(int minor, int nonblock)
+{
+        int error = 0;
+
+        /* If we're not in compatibility mode, we're ready now! */
+        if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
+          return (0);
+        }
+
+        do {
+                error = lp_check_status (minor);
+                if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
+                        break;
+                if (signal_pending (current)) {
+                        error = -EINTR;
+                        break;
+                }
+        } while (error);
+        return error;
+}
+
+static ssize_t lp_write(struct file * file, const char __user * buf,
+                        size_t count, loff_t *ppos)
+{
+        unsigned int minor = iminor(file->f_dentry->d_inode);
+        struct parport *port = lp_table[minor].dev->port;
+        char *kbuf = lp_table[minor].lp_buffer;
+        ssize_t retv = 0;
+        ssize_t written;
+        size_t copy_size = count;
+        int nonblock = ((file->f_flags & O_NONBLOCK) ||
+                        (LP_F(minor) & LP_ABORT));
+
+#ifdef LP_STATS
+        if (jiffies-lp_table[minor].lastcall > LP_TIME(minor))
+                lp_table[minor].runchars = 0;
+
+        lp_table[minor].lastcall = jiffies;
+#endif
+
+        /* Need to copy the data from user-space. */
+        if (copy_size > LP_BUFFER_SIZE)
+                copy_size = LP_BUFFER_SIZE;
+
+        if (down_interruptible (&lp_table[minor].port_mutex))
+                return -EINTR;
+
+        if (copy_from_user (kbuf, buf, copy_size)) {
+                retv = -EFAULT;
+                goto out_unlock;
+        }
+
+        /* Claim Parport or sleep until it becomes available
+         */
+        lp_claim_parport_or_block (&lp_table[minor]);
+        /* Go to the proper mode. */
+        lp_table[minor].current_mode = lp_negotiate (port, 
+                                                     lp_table[minor].best_mode);
+
+        parport_set_timeout (lp_table[minor].dev,
+                             (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
+                              : lp_table[minor].timeout));
+
+        if ((retv = lp_wait_ready (minor, nonblock)) == 0)
+        do {
+                /* Write the data. */
+                written = 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) {
+                        /* incomplete write -> check error ! */
+                        int error;
+
+                        parport_negotiate (lp_table[minor].dev->port, 
+                                           IEEE1284_MODE_COMPAT);
+                        lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
+
+                        error = lp_wait_ready (minor, nonblock);
+
+                        if (error) {
+                                if (retv == 0)
+                                        retv = error;
+                                break;
+                        } else if (nonblock) {
+                                if (retv == 0)
+                                        retv = -EAGAIN;
+                                break;
+                        }
+
+                        parport_yield_blocking (lp_table[minor].dev);
+                        lp_table[minor].current_mode 
+                          = lp_negotiate (port, 
+                                          lp_table[minor].best_mode);
+
+                } else if (need_resched())
+                        schedule ();
+
+                if (count) {
+                        copy_size = count;
+                        if (copy_size > LP_BUFFER_SIZE)
+                                copy_size = 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(LP_PREEMPT_REQUEST, 
+                               &lp_table[minor].bits)) {
+                printk(KERN_INFO "lp%d releasing parport\n", minor);
+                parport_negotiate (lp_table[minor].dev->port, 
+                                   IEEE1284_MODE_COMPAT);
+                lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
+                lp_release_parport (&lp_table[minor]);
+        }
+out_unlock:
+        up (&lp_table[minor].port_mutex);
+
+        return retv;
+}
+
+#ifdef CONFIG_PARPORT_1284
+
+/* Status readback conforming to ieee1284 */
+static ssize_t lp_read(struct file * file, char __user * buf,
+                       size_t count, loff_t *ppos)
+{
+        DEFINE_WAIT(wait);
+        unsigned int minor=iminor(file->f_dentry->d_inode);
+        struct parport *port = lp_table[minor].dev->port;
+        ssize_t retval = 0;
+        char *kbuf = lp_table[minor].lp_buffer;
+        int nonblock = ((file->f_flags & O_NONBLOCK) ||
+                        (LP_F(minor) & LP_ABORT));
+
+        if (count > LP_BUFFER_SIZE)
+                count = LP_BUFFER_SIZE;
+
+        if (down_interruptible (&lp_table[minor].port_mutex))
+                return -EINTR;
+
+        lp_claim_parport_or_block (&lp_table[minor]);
+
+        parport_set_timeout (lp_table[minor].dev,
+                             (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
+                              : lp_table[minor].timeout));
+
+        parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
+        if (parport_negotiate (lp_table[minor].dev->port,
+                               IEEE1284_MODE_NIBBLE)) {
+                retval = -EIO;
+                goto out;
+        }
+
+        while (retval == 0) {
+                retval = parport_read (port, kbuf, count);
+
+                if (retval > 0)
+                        break;
+
+                if (nonblock) {
+                        retval = -EAGAIN;
+                        break;
+                }
+
+                /* Wait for data. */
+
+                if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
+                        parport_negotiate (lp_table[minor].dev->port,
+                                           IEEE1284_MODE_COMPAT);
+                        lp_error (minor);
+                        if (parport_negotiate (lp_table[minor].dev->port,
+                                               IEEE1284_MODE_NIBBLE)) {
+                                retval = -EIO;
+                                goto out;
+                        }
+                } else {
+                        prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
+                        schedule_timeout(LP_TIMEOUT_POLLED);
+                        finish_wait(&lp_table[minor].waitq, &wait);
+                }
+
+                if (signal_pending (current)) {
+                        retval = -ERESTARTSYS;
+                        break;
+                }
+
+                cond_resched ();
+        }
+        parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
+ out:
+        lp_release_parport (&lp_table[minor]);
+
+        if (retval > 0 && copy_to_user (buf, kbuf, retval))
+                retval = -EFAULT;
+
+        up (&lp_table[minor].port_mutex);
+
+        return retval;
+}
+
+#endif /* IEEE 1284 support */
+
+static int lp_open(struct inode * inode, struct file * file)
+{
+        unsigned int minor = iminor(inode);
+
+        if (minor >= LP_NO)
+                return -ENXIO;
+        if ((LP_F(minor) & LP_EXIST) == 0)
+                return -ENXIO;
+        if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
+                return -EBUSY;
+
+        /* If ABORTOPEN is set and the printer is offline or out of paper,
+           we may still want to open it to perform ioctl()s.  Therefore we
+           have commandeered O_NONBLOCK, even though it is being used in
+           a non-standard manner.  This is strictly a Linux hack, and
+           should most likely only ever be used by the tunelp application. */
+        if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
+                int status;
+                lp_claim_parport_or_block (&lp_table[minor]);
+                status = r_str(minor);
+                lp_release_parport (&lp_table[minor]);
+                if (status & LP_POUTPA) {
+                        printk(KERN_INFO "lp%d out of paper\n", minor);
+                        LP_F(minor) &= ~LP_BUSY;
+                        return -ENOSPC;
+                } else if (!(status & LP_PSELECD)) {
+                        printk(KERN_INFO "lp%d off-line\n", minor);
+                        LP_F(minor) &= ~LP_BUSY;
+                        return -EIO;
+                } else if (!(status & LP_PERRORP)) {
+                        printk(KERN_ERR "lp%d printer error\n", minor);
+                        LP_F(minor) &= ~LP_BUSY;
+                        return -EIO;
+                }
+        }
+        lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
+        if (!lp_table[minor].lp_buffer) {
+                LP_F(minor) &= ~LP_BUSY;
+                return -ENOMEM;
+        }
+        /* Determine if the peripheral supports ECP mode */
+        lp_claim_parport_or_block (&lp_table[minor]);
+        if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
+             !parport_negotiate (lp_table[minor].dev->port, 
+                                 IEEE1284_MODE_ECP)) {
+                printk (KERN_INFO "lp%d: ECP mode\n", minor);
+                lp_table[minor].best_mode = IEEE1284_MODE_ECP;
+        } else {
+                lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
+        }
+        /* Leave peripheral in compatibility mode */
+        parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
+        lp_release_parport (&lp_table[minor]);
+        lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
+        return 0;
+}
+
+static int lp_release(struct inode * inode, struct file * file)
+{
+        unsigned int minor = iminor(inode);
+
+        lp_claim_parport_or_block (&lp_table[minor]);
+        parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
+        lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
+        lp_release_parport (&lp_table[minor]);
+        kfree(lp_table[minor].lp_buffer);
+        lp_table[minor].lp_buffer = NULL;
+        LP_F(minor) &= ~LP_BUSY;
+        return 0;
+}
+
+static int lp_ioctl(struct inode *inode, struct file *file,
+                    unsigned int cmd, unsigned long arg)
+{
+        unsigned int minor = iminor(inode);
+        int status;
+        int retval = 0;
+        void __user *argp = (void __user *)arg;
+
+#ifdef LP_DEBUG
+        printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
+#endif
+        if (minor >= LP_NO)
+                return -ENODEV;
+        if ((LP_F(minor) & LP_EXIST) == 0)
+                return -ENODEV;
+        switch ( cmd ) {
+                struct timeval par_timeout;
+                long to_jiffies;
+
+                case LPTIME:
+                        LP_TIME(minor) = arg * HZ/100;
+                        break;
+                case LPCHAR:
+                        LP_CHAR(minor) = arg;
+                        break;
+                case LPABORT:
+                        if (arg)
+                                LP_F(minor) |= LP_ABORT;
+                        else
+                                LP_F(minor) &= ~LP_ABORT;
+                        break;
+                case LPABORTOPEN:
+                        if (arg)
+                                LP_F(minor) |= LP_ABORTOPEN;
+                        else
+                                LP_F(minor) &= ~LP_ABORTOPEN;
+                        break;
+                case LPCAREFUL:
+                        if (arg)
+                                LP_F(minor) |= LP_CAREFUL;
+                        else
+                                LP_F(minor) &= ~LP_CAREFUL;
+                        break;
+                case LPWAIT:
+                        LP_WAIT(minor) = arg;
+                        break;
+                case LPSETIRQ: 
+                        return -EINVAL;
+                        break;
+                case LPGETIRQ:
+                        if (copy_to_user(argp, &LP_IRQ(minor),
+                                        sizeof(int)))
+                                return -EFAULT;
+                        break;
+                case LPGETSTATUS:
+                        lp_claim_parport_or_block (&lp_table[minor]);
+                        status = r_str(minor);
+                        lp_release_parport (&lp_table[minor]);
+
+                        if (copy_to_user(argp, &status, sizeof(int)))
+                                return -EFAULT;
+                        break;
+                case LPRESET:
+                        lp_reset(minor);
+                        break;
+#ifdef LP_STATS
+                case LPGETSTATS:
+                        if (copy_to_user(argp, &LP_STAT(minor),
+                                        sizeof(struct lp_stats)))
+                                return -EFAULT;
+                        if (capable(CAP_SYS_ADMIN))
+                                memset(&LP_STAT(minor), 0,
+                                                sizeof(struct lp_stats));
+                        break;
+#endif
+                case LPGETFLAGS:
+                        status = LP_F(minor);
+                        if (copy_to_user(argp, &status, sizeof(int)))
+                                return -EFAULT;
+                        break;
+
+                case LPSETTIMEOUT:
+                        if (copy_from_user (&par_timeout, argp,
+                                            sizeof (struct timeval))) {
+                                return -EFAULT;
+                        }
+                        /* Convert to jiffies, place in lp_table */
+                        if ((par_timeout.tv_sec < 0) ||
+                            (par_timeout.tv_usec < 0)) {
+                                return -EINVAL;
+                        }
+                        to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
+                        to_jiffies += par_timeout.tv_sec * (long) HZ;
+                        if (to_jiffies <= 0) {
+                                return -EINVAL;
+                        }
+                        lp_table[minor].timeout = to_jiffies;
+                        break;
+
+                default:
+                        retval = -EINVAL;
+        }
+        return retval;
+}
+
+static struct file_operations lp_fops = {
+        .owner          = THIS_MODULE,
+        .write          = lp_write,
+        .ioctl          = lp_ioctl,
+        .open           = lp_open,
+        .release        = lp_release,
+#ifdef CONFIG_PARPORT_1284
+        .read           = lp_read,
+#endif
+};
+
+/* --- support for console on the line printer ----------------- */
+
+#ifdef CONFIG_LP_CONSOLE
+
+#define CONSOLE_LP 0
+
+/* If the printer is out of paper, we can either lose the messages or
+ * stall until the printer is happy again.  Define CONSOLE_LP_STRICT
+ * non-zero to get the latter behaviour. */
+#define CONSOLE_LP_STRICT 1
+
+/* The console must be locked when we get here. */
+
+static void lp_console_write (struct console *co, const char *s,
+                              unsigned count)
+{
+        struct pardevice *dev = lp_table[CONSOLE_LP].dev;
+        struct parport *port = dev->port;
+        ssize_t written;
+
+        if (parport_claim (dev))
+                /* Nothing we can do. */
+                return;
+
+        parport_set_timeout (dev, 0);
+
+        /* Go to compatibility mode. */
+        parport_negotiate (port, IEEE1284_MODE_COMPAT);
+
+        do {
+                /* Write the data, converting LF->CRLF as we go. */
+                ssize_t canwrite = count;
+                char *lf = memchr (s, '\n', count);
+                if (lf)
+                        canwrite = lf - s;
+
+                if (canwrite > 0) {
+                        written = 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;
+
+                        /* Dodge the original '\n', and put '\r\n' instead. */
+                        s++;
+                        count--;
+                        do {
+                                written = parport_write (port, crlf, i);
+                                if (written > 0)
+                                        i -= written, crlf += written;
+                        } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
+                }
+        } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
+
+        parport_release (dev);
+}
+
+static struct console lpcons = {
+        .name           = "lp",
+        .write          = lp_console_write,
+        .flags          = CON_PRINTBUFFER,
+};
+
+#endif /* console on line printer */
+
+/* --- initialisation code ------------------------------------- */
+
+static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
+static char *parport[LP_NO] = { NULL,  };
+static int reset = 0;
+
+module_param_array(parport, charp, NULL, 0);
+module_param(reset, bool, 0);
+
+#ifndef MODULE
+static int __init lp_setup (char *str)
+{
+        static int parport_ptr; // initially zero
+        int x;
+
+        if (get_option (&str, &x)) {
+                if (x == 0) {
+                        /* disable driver on "lp=" or "lp=0" */
+                        parport_nr[0] = LP_PARPORT_OFF;
+                } else {
+                        printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
+                        return 0;
+                }
+        } else if (!strncmp(str, "parport", 7)) {
+                int n = simple_strtoul(str+7, NULL, 10);
+                if (parport_ptr < LP_NO)
+                        parport_nr[parport_ptr++] = n;
+                else
+                        printk(KERN_INFO "lp: too many ports, %s ignored.\n",
+                               str);
+        } else if (!strcmp(str, "auto")) {
+                parport_nr[0] = LP_PARPORT_AUTO;
+        } else if (!strcmp(str, "none")) {
+                parport_nr[parport_ptr++] = LP_PARPORT_NONE;
+        } else if (!strcmp(str, "reset")) {
+                reset = 1;
+        }
+        return 1;
+}
+#endif
+
+static int lp_register(int nr, struct parport *port)
+{
+        lp_table[nr].dev = parport_register_device(port, "lp", 
+                                                   lp_preempt, NULL, NULL, 0,
+                                                   (void *) &lp_table[nr]);
+        if (lp_table[nr].dev == NULL)
+                return 1;
+        lp_table[nr].flags |= LP_EXIST;
+
+        if (reset)
+                lp_reset(nr);
+
+        class_simple_device_add(lp_class, MKDEV(LP_MAJOR, nr), NULL,
+                                "lp%d", nr);
+        devfs_mk_cdev(MKDEV(LP_MAJOR, nr), S_IFCHR | S_IRUGO | S_IWUGO,
+                        "printers/%d", nr);
+
+        printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, 
+               (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
+
+#ifdef CONFIG_LP_CONSOLE
+        if (!nr) {
+                if (port->modes & PARPORT_MODE_SAFEININT) {
+                        register_console (&lpcons);
+                        console_registered = port;
+                        printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
+                } else
+                        printk (KERN_ERR "lp%d: cannot run console on %s\n",
+                                CONSOLE_LP, port->name);
+        }
+#endif
+
+        return 0;
+}
+
+static void lp_attach (struct parport *port)
+{
+        unsigned int i;
+
+        switch (parport_nr[0])
+        {
+        case LP_PARPORT_UNSPEC:
+        case LP_PARPORT_AUTO:
+                if (parport_nr[0] == LP_PARPORT_AUTO &&
+                    port->probe_info[0].class != PARPORT_CLASS_PRINTER)
+                        return;
+                if (lp_count == LP_NO) {
+                        printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
+                        return;
+                }
+                if (!lp_register(lp_count, port))
+                        lp_count++;
+                break;
+
+        default:
+                for (i = 0; i < LP_NO; i++) {
+                        if (port->number == parport_nr[i]) {
+                                if (!lp_register(i, port))
+                                        lp_count++;
+                                break;
+                        }
+                }
+                break;
+        }
+}
+
+static void lp_detach (struct parport *port)
+{
+        /* Write this some day. */
+#ifdef CONFIG_LP_CONSOLE
+        if (console_registered == port) {
+                unregister_console (&lpcons);
+                console_registered = NULL;
+        }
+#endif /* CONFIG_LP_CONSOLE */
+}
+
+static struct parport_driver lp_driver = {
+        .name = "lp",
+        .attach = lp_attach,
+        .detach = lp_detach,
+};
+
+static int __init lp_init (void)
+{
+        int i, err = 0;
+
+        if (parport_nr[0] == LP_PARPORT_OFF)
+                return 0;
+
+        for (i = 0; i < LP_NO; i++) {
+                lp_table[i].dev = NULL;
+                lp_table[i].flags = 0;
+                lp_table[i].chars = LP_INIT_CHAR;
+                lp_table[i].time = LP_INIT_TIME;
+                lp_table[i].wait = LP_INIT_WAIT;
+                lp_table[i].lp_buffer = NULL;
+#ifdef LP_STATS
+                lp_table[i].lastcall = 0;
+                lp_table[i].runchars = 0;
+                memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
+#endif
+                lp_table[i].last_error = 0;
+                init_waitqueue_head (&lp_table[i].waitq);
+                init_waitqueue_head (&lp_table[i].dataq);
+                init_MUTEX (&lp_table[i].port_mutex);
+                lp_table[i].timeout = 10 * HZ;
+        }
+
+        if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
+                printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
+                return -EIO;
+        }
+
+        devfs_mk_dir("printers");
+        lp_class = class_simple_create(THIS_MODULE, "printer");
+        if (IS_ERR(lp_class)) {
+                err = PTR_ERR(lp_class);
+                goto out_devfs;
+        }
+
+        if (parport_register_driver (&lp_driver)) {
+                printk (KERN_ERR "lp: unable to register with parport\n");
+                err = -EIO;
+                goto out_class;
+        }
+
+        if (!lp_count) {
+                printk (KERN_INFO "lp: driver loaded but no devices found\n");
+#ifndef CONFIG_PARPORT_1284
+                if (parport_nr[0] == LP_PARPORT_AUTO)
+                        printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
+#endif
+        }
+
+        return 0;
+
+out_class:
+        class_simple_destroy(lp_class);
+out_devfs:
+        devfs_remove("printers");
+        unregister_chrdev(LP_MAJOR, "lp");
+        return err;
+}
+
+static int __init lp_init_module (void)
+{
+        if (parport[0]) {
+                /* The user gave some parameters.  Let's see what they were.  */
+                if (!strncmp(parport[0], "auto", 4))
+                        parport_nr[0] = LP_PARPORT_AUTO;
+                else {
+                        int n;
+                        for (n = 0; n < LP_NO && parport[n]; n++) {
+                                if (!strncmp(parport[n], "none", 4))
+                                        parport_nr[n] = LP_PARPORT_NONE;
+                                else {
+                                        char *ep;
+                                        unsigned long r = simple_strtoul(parport[n], &ep, 0);
+                                        if (ep != parport[n]) 
+                                                parport_nr[n] = r;
+                                        else {
+                                                printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
+                                                return -ENODEV;
+                                        }
+                                }
+                        }
+                }
+        }
+
+        return lp_init();
+}
+
+static void lp_cleanup_module (void)
+{
+        unsigned int offset;
+
+        parport_unregister_driver (&lp_driver);
+
+#ifdef CONFIG_LP_CONSOLE
+        unregister_console (&lpcons);
+#endif
+
+        unregister_chrdev(LP_MAJOR, "lp");
+        for (offset = 0; offset < LP_NO; offset++) {
+                if (lp_table[offset].dev == NULL)
+                        continue;
+                parport_unregister_device(lp_table[offset].dev);
+                devfs_remove("printers/%d", offset);
+                class_simple_device_remove(MKDEV(LP_MAJOR, offset));
+        }
+        devfs_remove("printers");
+        class_simple_destroy(lp_class);
+}
+
+__setup("lp=", lp_setup);
+module_init(lp_init_module);
+module_exit(lp_cleanup_module);
+
+MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
+MODULE_LICENSE("GPL");