2 * Generic parallel printer driver
4 * Copyright (C) 1992 by Jim Weigand and Linus Torvalds
5 * Copyright (C) 1992,1993 by Michael K. Johnson
6 * - Thanks much to Gunter Windau for pointing out to me where the error
7 * checking ought to be.
8 * Copyright (C) 1993 by Nigel Gamble (added interrupt code)
9 * Copyright (C) 1994 by Alan Cox (Modularised it)
10 * LPCAREFUL, LPABORT, LPGETSTATUS added by Chris Metcalf, metcalf@lcs.mit.edu
11 * Statistics and support for slow printers by Rob Janssen, rob@knoware.nl
12 * "lp=" command line parameters added by Grant Guenther, grant@torque.net
13 * lp_read (Status readback) support added by Carsten Gross,
14 * carsten@sol.wohnheim.uni-ulm.de
15 * Support for parport by Philip Blundell <Philip.Blundell@pobox.com>
16 * Parport sharing hacking by Andrea Arcangeli
17 * Fixed kernel_(to/from)_user memory copy to check for errors
18 * by Riccardo Facchetti <fizban@tin.it>
19 * 22-JAN-1998 Added support for devfs Richard Gooch <rgooch@atnf.csiro.au>
20 * Redesigned interrupt handling for handle printers with buggy handshake
21 * by Andrea Arcangeli, 11 May 1998
22 * Full efficient handling of printer with buggy irq handshake (now I have
23 * understood the meaning of the strange handshake). This is done sending new
24 * characters if the interrupt is just happened, even if the printer say to
25 * be still BUSY. This is needed at least with Epson Stylus Color. To enable
26 * the new TRUST_IRQ mode read the `LP OPTIMIZATION' section below...
27 * Fixed the irq on the rising edge of the strobe case.
28 * Obsoleted the CAREFUL flag since a printer that doesn' t work with
29 * CAREFUL will block a bit after in lp_check_status().
30 * Andrea Arcangeli, 15 Oct 1998
31 * Obsoleted and removed all the lowlevel stuff implemented in the last
32 * month to use the IEEE1284 functions (that handle the _new_ compatibilty
36 /* This driver should, in theory, work with any parallel port that has an
37 * appropriate low-level driver; all I/O is done through the parport
40 * If this driver is built into the kernel, you can configure it using the
41 * kernel command-line. For example:
43 * lp=parport1,none,parport2 (bind lp0 to parport1, disable lp1 and
44 * bind lp2 to parport2)
46 * lp=auto (assign lp devices to all ports that
47 * have printers attached, as determined
48 * by the IEEE-1284 autoprobe)
50 * lp=reset (reset the printer during
53 * lp=off (disable the printer driver entirely)
55 * If the driver is loaded as a module, similar functionality is available
56 * using module parameters. The equivalent of the above commands would be:
58 * # insmod lp.o parport=1,none,2
60 * # insmod lp.o parport=auto
62 * # insmod lp.o reset=1
65 /* COMPATIBILITY WITH OLD KERNELS
67 * Under Linux 2.0 and previous versions, lp devices were bound to ports at
68 * particular I/O addresses, as follows:
74 * The new driver, by default, binds lp devices to parport devices as it
75 * finds them. This means that if you only have one port, it will be bound
76 * to lp0 regardless of its I/O address. If you need the old behaviour, you
77 * can force it using the parameters described above.
81 * The new interrupt handling code take care of the buggy handshake
82 * of some HP and Epson printer:
84 * ACK _______________ ___________
87 * BUSY _________ _______
90 * I discovered this using the printer scanner that you can find at:
92 * ftp://e-mind.com/pub/linux/pscan/
94 * 11 May 98, Andrea Arcangeli
96 * My printer scanner run on an Epson Stylus Color show that such printer
97 * generates the irq on the _rising_ edge of the STROBE. Now lp handle
100 * 15 Oct 1998, Andrea Arcangeli
102 * The so called `buggy' handshake is really the well documented
103 * compatibility mode IEEE1284 handshake. They changed the well known
104 * Centronics handshake acking in the middle of busy expecting to not
105 * break drivers or legacy application, while they broken linux lp
106 * until I fixed it reverse engineering the protocol by hand some
109 * 14 Dec 1998, Andrea Arcangeli
111 * Copyright (C) 2000 by Tim Waugh (added LPSETTIMEOUT ioctl)
114 #include <linux/module.h>
115 #include <linux/init.h>
117 #include <linux/config.h>
118 #include <linux/errno.h>
119 #include <linux/kernel.h>
120 #include <linux/major.h>
121 #include <linux/sched.h>
122 #include <linux/smp_lock.h>
123 #include <linux/devfs_fs_kernel.h>
124 #include <linux/slab.h>
125 #include <linux/fcntl.h>
126 #include <linux/delay.h>
127 #include <linux/poll.h>
128 #include <linux/console.h>
129 #include <linux/device.h>
131 #include <linux/parport.h>
133 #include <linux/lp.h>
136 #include <asm/uaccess.h>
137 #include <asm/system.h>
139 /* if you have more than 8 printers, remember to increase LP_NO */
142 /* ROUND_UP macro from fs/select.c */
143 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
145 struct lp_struct lp_table[LP_NO];
147 static unsigned int lp_count = 0;
148 static struct class_simple *lp_class;
150 #ifdef CONFIG_LP_CONSOLE
151 static struct parport *console_registered; // initially NULL
152 #endif /* CONFIG_LP_CONSOLE */
156 /* Bits used to manage claiming the parport device */
157 #define LP_PREEMPT_REQUEST 1
158 #define LP_PARPORT_CLAIMED 2
160 /* --- low-level port access ----------------------------------- */
162 #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
163 #define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
164 #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
165 #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
167 /* Claim the parport or block trying unless we've already claimed it */
168 static void lp_claim_parport_or_block(struct lp_struct *this_lp)
170 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
171 parport_claim_or_block (this_lp->dev);
175 /* Claim the parport or block trying unless we've already claimed it */
176 static void lp_release_parport(struct lp_struct *this_lp)
178 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
179 parport_release (this_lp->dev);
185 static int lp_preempt(void *handle)
187 struct lp_struct *this_lp = (struct lp_struct *)handle;
188 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
194 * Try to negotiate to a new mode; if unsuccessful negotiate to
195 * compatibility mode. Return the mode we ended up in.
197 static int lp_negotiate(struct parport * port, int mode)
199 if (parport_negotiate (port, mode) != 0) {
200 mode = IEEE1284_MODE_COMPAT;
201 parport_negotiate (port, mode);
207 static int lp_reset(int minor)
210 lp_claim_parport_or_block (&lp_table[minor]);
211 w_ctr(minor, LP_PSELECP);
213 w_ctr(minor, LP_PSELECP | LP_PINITP);
214 retval = r_str(minor);
215 lp_release_parport (&lp_table[minor]);
219 static void lp_error (int minor)
223 if (LP_F(minor) & LP_ABORT)
226 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
227 if (polling) lp_release_parport (&lp_table[minor]);
228 interruptible_sleep_on_timeout (&lp_table[minor].waitq,
230 if (polling) lp_claim_parport_or_block (&lp_table[minor]);
231 else parport_yield_blocking (lp_table[minor].dev);
234 static int lp_check_status(int minor)
237 unsigned int last = lp_table[minor].last_error;
238 unsigned char status = r_str(minor);
239 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
242 else if ((status & LP_POUTPA)) {
243 if (last != LP_POUTPA) {
245 printk(KERN_INFO "lp%d out of paper\n", minor);
248 } else if (!(status & LP_PSELECD)) {
249 if (last != LP_PSELECD) {
251 printk(KERN_INFO "lp%d off-line\n", minor);
254 } else if (!(status & LP_PERRORP)) {
255 if (last != LP_PERRORP) {
257 printk(KERN_INFO "lp%d on fire\n", minor);
261 last = 0; /* Come here if LP_CAREFUL is set and no
262 errors are reported. */
265 lp_table[minor].last_error = last;
273 static int lp_wait_ready(int minor, int nonblock)
277 /* If we're not in compatibility mode, we're ready now! */
278 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
283 error = lp_check_status (minor);
284 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
286 if (signal_pending (current)) {
294 static ssize_t lp_write(struct file * file, const char __user * buf,
295 size_t count, loff_t *ppos)
297 unsigned int minor = iminor(file->f_dentry->d_inode);
298 struct parport *port = lp_table[minor].dev->port;
299 char *kbuf = lp_table[minor].lp_buffer;
302 size_t copy_size = count;
303 int nonblock = ((file->f_flags & O_NONBLOCK) ||
304 (LP_F(minor) & LP_ABORT));
307 if (jiffies-lp_table[minor].lastcall > LP_TIME(minor))
308 lp_table[minor].runchars = 0;
310 lp_table[minor].lastcall = jiffies;
313 /* Need to copy the data from user-space. */
314 if (copy_size > LP_BUFFER_SIZE)
315 copy_size = LP_BUFFER_SIZE;
317 if (copy_from_user (kbuf, buf, copy_size))
320 if (down_interruptible (&lp_table[minor].port_mutex))
323 /* Claim Parport or sleep until it becomes available
325 lp_claim_parport_or_block (&lp_table[minor]);
326 /* Go to the proper mode. */
327 lp_table[minor].current_mode = lp_negotiate (port,
328 lp_table[minor].best_mode);
330 parport_set_timeout (lp_table[minor].dev,
331 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
332 : lp_table[minor].timeout));
334 if ((retv = lp_wait_ready (minor, nonblock)) == 0)
336 /* Write the data. */
337 written = parport_write (port, kbuf, copy_size);
339 copy_size -= written;
345 if (signal_pending (current)) {
353 /* incomplete write -> check error ! */
356 parport_negotiate (lp_table[minor].dev->port,
357 IEEE1284_MODE_COMPAT);
358 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
360 error = lp_wait_ready (minor, nonblock);
366 } else if (nonblock) {
372 parport_yield_blocking (lp_table[minor].dev);
373 lp_table[minor].current_mode
374 = lp_negotiate (port,
375 lp_table[minor].best_mode);
377 } else if (need_resched())
382 if (copy_size > LP_BUFFER_SIZE)
383 copy_size = LP_BUFFER_SIZE;
385 if (copy_from_user(kbuf, buf, copy_size)) {
393 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
394 &lp_table[minor].bits)) {
395 printk(KERN_INFO "lp%d releasing parport\n", minor);
396 parport_negotiate (lp_table[minor].dev->port,
397 IEEE1284_MODE_COMPAT);
398 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
399 lp_release_parport (&lp_table[minor]);
402 up (&lp_table[minor].port_mutex);
407 #ifdef CONFIG_PARPORT_1284
409 /* Status readback conforming to ieee1284 */
410 static ssize_t lp_read(struct file * file, char __user * buf,
411 size_t count, loff_t *ppos)
413 unsigned int minor=iminor(file->f_dentry->d_inode);
414 struct parport *port = lp_table[minor].dev->port;
416 char *kbuf = lp_table[minor].lp_buffer;
417 int nonblock = ((file->f_flags & O_NONBLOCK) ||
418 (LP_F(minor) & LP_ABORT));
420 if (count > LP_BUFFER_SIZE)
421 count = LP_BUFFER_SIZE;
423 if (down_interruptible (&lp_table[minor].port_mutex))
426 lp_claim_parport_or_block (&lp_table[minor]);
428 parport_set_timeout (lp_table[minor].dev,
429 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
430 : lp_table[minor].timeout));
432 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
433 if (parport_negotiate (lp_table[minor].dev->port,
434 IEEE1284_MODE_NIBBLE)) {
439 while (retval == 0) {
440 retval = parport_read (port, kbuf, count);
452 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
453 parport_negotiate (lp_table[minor].dev->port,
454 IEEE1284_MODE_COMPAT);
456 if (parport_negotiate (lp_table[minor].dev->port,
457 IEEE1284_MODE_NIBBLE)) {
462 interruptible_sleep_on_timeout (&lp_table[minor].waitq,
465 if (signal_pending (current)) {
466 retval = -ERESTARTSYS;
472 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
474 lp_release_parport (&lp_table[minor]);
476 if (retval > 0 && copy_to_user (buf, kbuf, retval))
479 up (&lp_table[minor].port_mutex);
484 #endif /* IEEE 1284 support */
486 static int lp_open(struct inode * inode, struct file * file)
488 unsigned int minor = iminor(inode);
492 if ((LP_F(minor) & LP_EXIST) == 0)
494 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
497 /* If ABORTOPEN is set and the printer is offline or out of paper,
498 we may still want to open it to perform ioctl()s. Therefore we
499 have commandeered O_NONBLOCK, even though it is being used in
500 a non-standard manner. This is strictly a Linux hack, and
501 should most likely only ever be used by the tunelp application. */
502 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
504 lp_claim_parport_or_block (&lp_table[minor]);
505 status = r_str(minor);
506 lp_release_parport (&lp_table[minor]);
507 if (status & LP_POUTPA) {
508 printk(KERN_INFO "lp%d out of paper\n", minor);
509 LP_F(minor) &= ~LP_BUSY;
511 } else if (!(status & LP_PSELECD)) {
512 printk(KERN_INFO "lp%d off-line\n", minor);
513 LP_F(minor) &= ~LP_BUSY;
515 } else if (!(status & LP_PERRORP)) {
516 printk(KERN_ERR "lp%d printer error\n", minor);
517 LP_F(minor) &= ~LP_BUSY;
521 lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
522 if (!lp_table[minor].lp_buffer) {
523 LP_F(minor) &= ~LP_BUSY;
526 /* Determine if the peripheral supports ECP mode */
527 lp_claim_parport_or_block (&lp_table[minor]);
528 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
529 !parport_negotiate (lp_table[minor].dev->port,
530 IEEE1284_MODE_ECP)) {
531 printk (KERN_INFO "lp%d: ECP mode\n", minor);
532 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
534 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
536 /* Leave peripheral in compatibility mode */
537 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
538 lp_release_parport (&lp_table[minor]);
539 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
543 static int lp_release(struct inode * inode, struct file * file)
545 unsigned int minor = iminor(inode);
547 lp_claim_parport_or_block (&lp_table[minor]);
548 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
549 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
550 lp_release_parport (&lp_table[minor]);
551 kfree(lp_table[minor].lp_buffer);
552 lp_table[minor].lp_buffer = NULL;
553 LP_F(minor) &= ~LP_BUSY;
557 static int lp_ioctl(struct inode *inode, struct file *file,
558 unsigned int cmd, unsigned long arg)
560 unsigned int minor = iminor(inode);
563 void __user *argp = (void __user *)arg;
566 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
570 if ((LP_F(minor) & LP_EXIST) == 0)
573 struct timeval par_timeout;
577 LP_TIME(minor) = arg * HZ/100;
580 LP_CHAR(minor) = arg;
584 LP_F(minor) |= LP_ABORT;
586 LP_F(minor) &= ~LP_ABORT;
590 LP_F(minor) |= LP_ABORTOPEN;
592 LP_F(minor) &= ~LP_ABORTOPEN;
596 LP_F(minor) |= LP_CAREFUL;
598 LP_F(minor) &= ~LP_CAREFUL;
601 LP_WAIT(minor) = arg;
607 if (copy_to_user(argp, &LP_IRQ(minor),
612 lp_claim_parport_or_block (&lp_table[minor]);
613 status = r_str(minor);
614 lp_release_parport (&lp_table[minor]);
616 if (copy_to_user(argp, &status, sizeof(int)))
624 if (copy_to_user(argp, &LP_STAT(minor),
625 sizeof(struct lp_stats)))
627 if (capable(CAP_SYS_ADMIN))
628 memset(&LP_STAT(minor), 0,
629 sizeof(struct lp_stats));
633 status = LP_F(minor);
634 if (copy_to_user(argp, &status, sizeof(int)))
639 if (copy_from_user (&par_timeout, argp,
640 sizeof (struct timeval))) {
643 /* Convert to jiffies, place in lp_table */
644 if ((par_timeout.tv_sec < 0) ||
645 (par_timeout.tv_usec < 0)) {
648 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
649 to_jiffies += par_timeout.tv_sec * (long) HZ;
650 if (to_jiffies <= 0) {
653 lp_table[minor].timeout = to_jiffies;
662 static struct file_operations lp_fops = {
663 .owner = THIS_MODULE,
667 .release = lp_release,
668 #ifdef CONFIG_PARPORT_1284
673 /* --- support for console on the line printer ----------------- */
675 #ifdef CONFIG_LP_CONSOLE
679 /* If the printer is out of paper, we can either lose the messages or
680 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
681 * non-zero to get the latter behaviour. */
682 #define CONSOLE_LP_STRICT 1
684 /* The console must be locked when we get here. */
686 static void lp_console_write (struct console *co, const char *s,
689 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
690 struct parport *port = dev->port;
693 if (parport_claim (dev))
694 /* Nothing we can do. */
697 parport_set_timeout (dev, 0);
699 /* Go to compatibility mode. */
700 parport_negotiate (port, IEEE1284_MODE_COMPAT);
703 /* Write the data, converting LF->CRLF as we go. */
704 ssize_t canwrite = count;
705 char *lf = memchr (s, '\n', count);
710 written = parport_write (port, s, canwrite);
720 if (lf && canwrite <= 0) {
721 const char *crlf = "\r\n";
724 /* Dodge the original '\n', and put '\r\n' instead. */
728 written = parport_write (port, crlf, i);
730 i -= written, crlf += written;
731 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
733 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
735 parport_release (dev);
738 static struct console lpcons = {
740 .write = lp_console_write,
741 .flags = CON_PRINTBUFFER,
744 #endif /* console on line printer */
746 /* --- initialisation code ------------------------------------- */
748 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
749 static char *parport[LP_NO] = { NULL, };
750 static int reset = 0;
752 MODULE_PARM(parport, "1-" __MODULE_STRING(LP_NO) "s");
753 MODULE_PARM(reset, "i");
756 static int __init lp_setup (char *str)
758 static int parport_ptr; // initially zero
761 if (get_option (&str, &x)) {
763 /* disable driver on "lp=" or "lp=0" */
764 parport_nr[0] = LP_PARPORT_OFF;
766 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
769 } else if (!strncmp(str, "parport", 7)) {
770 int n = simple_strtoul(str+7, NULL, 10);
771 if (parport_ptr < LP_NO)
772 parport_nr[parport_ptr++] = n;
774 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
776 } else if (!strcmp(str, "auto")) {
777 parport_nr[0] = LP_PARPORT_AUTO;
778 } else if (!strcmp(str, "none")) {
779 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
780 } else if (!strcmp(str, "reset")) {
787 static int lp_register(int nr, struct parport *port)
789 lp_table[nr].dev = parport_register_device(port, "lp",
790 lp_preempt, NULL, NULL, 0,
791 (void *) &lp_table[nr]);
792 if (lp_table[nr].dev == NULL)
794 lp_table[nr].flags |= LP_EXIST;
799 class_simple_device_add(lp_class, MKDEV(LP_MAJOR, nr), NULL,
801 devfs_mk_cdev(MKDEV(LP_MAJOR, nr), S_IFCHR | S_IRUGO | S_IWUGO,
804 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
805 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
807 #ifdef CONFIG_LP_CONSOLE
809 if (port->modes & PARPORT_MODE_SAFEININT) {
810 register_console (&lpcons);
811 console_registered = port;
812 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
814 printk (KERN_ERR "lp%d: cannot run console on %s\n",
815 CONSOLE_LP, port->name);
822 static void lp_attach (struct parport *port)
826 switch (parport_nr[0])
828 case LP_PARPORT_UNSPEC:
829 case LP_PARPORT_AUTO:
830 if (parport_nr[0] == LP_PARPORT_AUTO &&
831 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
833 if (lp_count == LP_NO) {
834 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
837 if (!lp_register(lp_count, port))
842 for (i = 0; i < LP_NO; i++) {
843 if (port->number == parport_nr[i]) {
844 if (!lp_register(i, port))
853 static void lp_detach (struct parport *port)
855 /* Write this some day. */
856 #ifdef CONFIG_LP_CONSOLE
857 if (console_registered == port) {
858 unregister_console (&lpcons);
859 console_registered = NULL;
861 #endif /* CONFIG_LP_CONSOLE */
864 static struct parport_driver lp_driver = {
870 int __init lp_init (void)
874 if (parport_nr[0] == LP_PARPORT_OFF)
877 for (i = 0; i < LP_NO; i++) {
878 lp_table[i].dev = NULL;
879 lp_table[i].flags = 0;
880 lp_table[i].chars = LP_INIT_CHAR;
881 lp_table[i].time = LP_INIT_TIME;
882 lp_table[i].wait = LP_INIT_WAIT;
883 lp_table[i].lp_buffer = NULL;
885 lp_table[i].lastcall = 0;
886 lp_table[i].runchars = 0;
887 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
889 lp_table[i].last_error = 0;
890 init_waitqueue_head (&lp_table[i].waitq);
891 init_waitqueue_head (&lp_table[i].dataq);
892 init_MUTEX (&lp_table[i].port_mutex);
893 lp_table[i].timeout = 10 * HZ;
896 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
897 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
901 devfs_mk_dir("printers");
902 lp_class = class_simple_create(THIS_MODULE, "printer");
903 if (IS_ERR(lp_class)) {
904 err = PTR_ERR(lp_class);
908 if (parport_register_driver (&lp_driver)) {
909 printk (KERN_ERR "lp: unable to register with parport\n");
915 printk (KERN_INFO "lp: driver loaded but no devices found\n");
916 #ifndef CONFIG_PARPORT_1284
917 if (parport_nr[0] == LP_PARPORT_AUTO)
918 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
925 class_simple_destroy(lp_class);
927 devfs_remove("printers");
928 unregister_chrdev(LP_MAJOR, "lp");
932 static int __init lp_init_module (void)
935 /* The user gave some parameters. Let's see what they were. */
936 if (!strncmp(parport[0], "auto", 4))
937 parport_nr[0] = LP_PARPORT_AUTO;
940 for (n = 0; n < LP_NO && parport[n]; n++) {
941 if (!strncmp(parport[n], "none", 4))
942 parport_nr[n] = LP_PARPORT_NONE;
945 unsigned long r = simple_strtoul(parport[n], &ep, 0);
946 if (ep != parport[n])
949 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
960 static void lp_cleanup_module (void)
964 parport_unregister_driver (&lp_driver);
966 #ifdef CONFIG_LP_CONSOLE
967 unregister_console (&lpcons);
970 unregister_chrdev(LP_MAJOR, "lp");
971 for (offset = 0; offset < LP_NO; offset++) {
972 if (lp_table[offset].dev == NULL)
974 parport_unregister_device(lp_table[offset].dev);
975 devfs_remove("printers/%d", offset);
976 class_simple_device_remove(MKDEV(LP_MAJOR, offset));
978 devfs_remove("printers");
979 class_simple_destroy(lp_class);
982 __setup("lp=", lp_setup);
983 module_init(lp_init_module);
984 module_exit(lp_cleanup_module);
986 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
987 MODULE_LICENSE("GPL");