lp.c
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上传日期:2013-04-10
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- /*
- * 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 <Philip.Blundell@pobox.com>
- * 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/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 devfs_handle_t devfs_handle = NULL;
- struct lp_struct lp_table[LP_NO];
- static unsigned int lp_count = 0;
- #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)
- {
- 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]);
- interruptible_sleep_on_timeout (&lp_table[minor].waitq,
- LP_TIMEOUT_POLLED);
- 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 papern", minor);
- }
- error = -ENOSPC;
- } else if (!(status & LP_PSELECD)) {
- if (last != LP_PSELECD) {
- last = LP_PSELECD;
- printk(KERN_INFO "lp%d off-linen", minor);
- }
- error = -EIO;
- } else if (!(status & LP_PERRORP)) {
- if (last != LP_PERRORP) {
- last = LP_PERRORP;
- printk(KERN_INFO "lp%d on firen", 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 * buf,
- size_t count, loff_t *ppos)
- {
- unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
- 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 (copy_from_user (kbuf, buf, copy_size))
- return -EFAULT;
- if (down_interruptible (&lp_table[minor].port_mutex))
- return -EINTR;
- /* 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 (current->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 parportn", 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]);
- }
- 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 * buf,
- size_t count, loff_t *ppos)
- {
- unsigned int minor=MINOR(file->f_dentry->d_inode->i_rdev);
- 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
- interruptible_sleep_on_timeout (&lp_table[minor].waitq,
- LP_TIMEOUT_POLLED);
- if (signal_pending (current)) {
- retval = -ERESTARTSYS;
- break;
- }
- if (current->need_resched)
- schedule ();
- }
- 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 = MINOR(inode->i_rdev);
- 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 papern", minor);
- LP_F(minor) &= ~LP_BUSY;
- return -ENOSPC;
- } else if (!(status & LP_PSELECD)) {
- printk(KERN_INFO "lp%d off-linen", minor);
- LP_F(minor) &= ~LP_BUSY;
- return -EIO;
- } else if (!(status & LP_PERRORP)) {
- printk(KERN_ERR "lp%d printer errorn", 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 moden", 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 = MINOR(inode->i_rdev);
- 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]);
- lock_kernel();
- kfree(lp_table[minor].lp_buffer);
- lp_table[minor].lp_buffer = NULL;
- LP_F(minor) &= ~LP_BUSY;
- unlock_kernel();
- return 0;
- }
- static int lp_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
- {
- unsigned int minor = MINOR(inode->i_rdev);
- int status;
- int retval = 0;
- #ifdef LP_DEBUG
- printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lxn", 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((int *) arg, &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((int *) arg, &status, sizeof(int)))
- return -EFAULT;
- break;
- case LPRESET:
- lp_reset(minor);
- break;
- #ifdef LP_STATS
- case LPGETSTATS:
- if (copy_to_user((int *) arg, &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((int *) arg, &status, sizeof(int)))
- return -EFAULT;
- break;
- case LPSETTIMEOUT:
- if (copy_from_user (&par_timeout,
- (struct timeval *) arg,
- 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 = "rn";
- int i = 2;
- /* Dodge the original 'n', and put 'rn' 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 kdev_t lp_console_device (struct console *c)
- {
- return MKDEV(LP_MAJOR, CONSOLE_LP);
- }
- static struct console lpcons = {
- name: "lp",
- write: lp_console_write,
- device: lp_console_device,
- 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_PARM(parport, "1-" __MODULE_STRING(LP_NO) "s");
- MODULE_PARM(reset, "i");
- #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, ignoredn", 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)
- {
- char name[8];
- 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);
- sprintf (name, "%d", nr);
- devfs_register (devfs_handle, name,
- DEVFS_FL_DEFAULT, LP_MAJOR, nr,
- S_IFCHR | S_IRUGO | S_IWUGO,
- &lp_fops, NULL);
- 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 readyn", CONSOLE_LP);
- } else
- printk (KERN_ERR "lp%d: cannot run console on %sn",
- 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("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 = {
- "lp",
- lp_attach,
- lp_detach,
- NULL
- };
- int __init lp_init (void)
- {
- int i;
- 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 (devfs_register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
- printk ("lp: unable to get major %dn", LP_MAJOR);
- return -EIO;
- }
- devfs_handle = devfs_mk_dir (NULL, "printers", NULL);
- if (parport_register_driver (&lp_driver)) {
- printk ("lp: unable to register with parportn");
- return -EIO;
- }
- if (!lp_count) {
- printk (KERN_INFO "lp: driver loaded but no devices foundn");
- #ifndef CONFIG_PARPORT_1284
- if (parport_nr[0] == LP_PARPORT_AUTO)
- printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)n");
- #endif
- }
- return 0;
- }
- 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
- devfs_unregister (devfs_handle);
- devfs_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);
- }
- }
- __setup("lp=", lp_setup);
- module_init(lp_init_module);
- module_exit(lp_cleanup_module);
- MODULE_LICENSE("GPL");
- EXPORT_NO_SYMBOLS;