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 <philb@gnu.org>
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/errno.h>
118 #include <linux/kernel.h>
119 #include <linux/major.h>
120 #include <linux/sched.h>
121 #include <linux/slab.h>
122 #include <linux/fcntl.h>
123 #include <linux/delay.h>
124 #include <linux/poll.h>
125 #include <linux/console.h>
126 #include <linux/device.h>
127 #include <linux/wait.h>
128 #include <linux/jiffies.h>
130 #include <linux/parport.h>
132 #include <linux/lp.h>
135 #include <asm/uaccess.h>
136 #include <asm/system.h>
138 /* if you have more than 8 printers, remember to increase LP_NO */
141 /* ROUND_UP macro from fs/select.c */
142 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
144 static struct lp_struct lp_table[LP_NO];
146 static unsigned int lp_count = 0;
147 static struct class *lp_class;
149 #ifdef CONFIG_LP_CONSOLE
150 static struct parport *console_registered; // initially NULL
151 #endif /* CONFIG_LP_CONSOLE */
155 /* Bits used to manage claiming the parport device */
156 #define LP_PREEMPT_REQUEST 1
157 #define LP_PARPORT_CLAIMED 2
159 /* --- low-level port access ----------------------------------- */
161 #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
162 #define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
163 #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
164 #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
166 /* Claim the parport or block trying unless we've already claimed it */
167 static void lp_claim_parport_or_block(struct lp_struct *this_lp)
169 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
170 parport_claim_or_block (this_lp->dev);
174 /* Claim the parport or block trying unless we've already claimed it */
175 static void lp_release_parport(struct lp_struct *this_lp)
177 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
178 parport_release (this_lp->dev);
184 static int lp_preempt(void *handle)
186 struct lp_struct *this_lp = (struct lp_struct *)handle;
187 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
193 * Try to negotiate to a new mode; if unsuccessful negotiate to
194 * compatibility mode. Return the mode we ended up in.
196 static int lp_negotiate(struct parport * port, int mode)
198 if (parport_negotiate (port, mode) != 0) {
199 mode = IEEE1284_MODE_COMPAT;
200 parport_negotiate (port, mode);
206 static int lp_reset(int minor)
209 lp_claim_parport_or_block (&lp_table[minor]);
210 w_ctr(minor, LP_PSELECP);
212 w_ctr(minor, LP_PSELECP | LP_PINITP);
213 retval = r_str(minor);
214 lp_release_parport (&lp_table[minor]);
218 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 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
229 schedule_timeout(LP_TIMEOUT_POLLED);
230 finish_wait(&lp_table[minor].waitq, &wait);
231 if (polling) lp_claim_parport_or_block (&lp_table[minor]);
232 else parport_yield_blocking (lp_table[minor].dev);
235 static int lp_check_status(int minor)
238 unsigned int last = lp_table[minor].last_error;
239 unsigned char status = r_str(minor);
240 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
243 else if ((status & LP_POUTPA)) {
244 if (last != LP_POUTPA) {
246 printk(KERN_INFO "lp%d out of paper\n", minor);
249 } else if (!(status & LP_PSELECD)) {
250 if (last != LP_PSELECD) {
252 printk(KERN_INFO "lp%d off-line\n", minor);
255 } else if (!(status & LP_PERRORP)) {
256 if (last != LP_PERRORP) {
258 printk(KERN_INFO "lp%d on fire\n", minor);
262 last = 0; /* Come here if LP_CAREFUL is set and no
263 errors are reported. */
266 lp_table[minor].last_error = last;
274 static int lp_wait_ready(int minor, int nonblock)
278 /* If we're not in compatibility mode, we're ready now! */
279 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
284 error = lp_check_status (minor);
285 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
287 if (signal_pending (current)) {
295 static ssize_t lp_write(struct file * file, const char __user * buf,
296 size_t count, loff_t *ppos)
298 unsigned int minor = iminor(file->f_path.dentry->d_inode);
299 struct parport *port = lp_table[minor].dev->port;
300 char *kbuf = lp_table[minor].lp_buffer;
303 size_t copy_size = count;
304 int nonblock = ((file->f_flags & O_NONBLOCK) ||
305 (LP_F(minor) & LP_ABORT));
308 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
309 lp_table[minor].runchars = 0;
311 lp_table[minor].lastcall = jiffies;
314 /* Need to copy the data from user-space. */
315 if (copy_size > LP_BUFFER_SIZE)
316 copy_size = LP_BUFFER_SIZE;
318 if (down_interruptible (&lp_table[minor].port_mutex))
321 if (copy_from_user (kbuf, buf, copy_size)) {
326 /* Claim Parport or sleep until it becomes available
328 lp_claim_parport_or_block (&lp_table[minor]);
329 /* Go to the proper mode. */
330 lp_table[minor].current_mode = lp_negotiate (port,
331 lp_table[minor].best_mode);
333 parport_set_timeout (lp_table[minor].dev,
334 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
335 : lp_table[minor].timeout));
337 if ((retv = lp_wait_ready (minor, nonblock)) == 0)
339 /* Write the data. */
340 written = parport_write (port, kbuf, copy_size);
342 copy_size -= written;
348 if (signal_pending (current)) {
356 /* incomplete write -> check error ! */
359 parport_negotiate (lp_table[minor].dev->port,
360 IEEE1284_MODE_COMPAT);
361 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
363 error = lp_wait_ready (minor, nonblock);
369 } else if (nonblock) {
375 parport_yield_blocking (lp_table[minor].dev);
376 lp_table[minor].current_mode
377 = lp_negotiate (port,
378 lp_table[minor].best_mode);
380 } else if (need_resched())
385 if (copy_size > LP_BUFFER_SIZE)
386 copy_size = LP_BUFFER_SIZE;
388 if (copy_from_user(kbuf, buf, copy_size)) {
396 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
397 &lp_table[minor].bits)) {
398 printk(KERN_INFO "lp%d releasing parport\n", minor);
399 parport_negotiate (lp_table[minor].dev->port,
400 IEEE1284_MODE_COMPAT);
401 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
402 lp_release_parport (&lp_table[minor]);
405 up (&lp_table[minor].port_mutex);
410 #ifdef CONFIG_PARPORT_1284
412 /* Status readback conforming to ieee1284 */
413 static ssize_t lp_read(struct file * file, char __user * buf,
414 size_t count, loff_t *ppos)
417 unsigned int minor=iminor(file->f_path.dentry->d_inode);
418 struct parport *port = lp_table[minor].dev->port;
420 char *kbuf = lp_table[minor].lp_buffer;
421 int nonblock = ((file->f_flags & O_NONBLOCK) ||
422 (LP_F(minor) & LP_ABORT));
424 if (count > LP_BUFFER_SIZE)
425 count = LP_BUFFER_SIZE;
427 if (down_interruptible (&lp_table[minor].port_mutex))
430 lp_claim_parport_or_block (&lp_table[minor]);
432 parport_set_timeout (lp_table[minor].dev,
433 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
434 : lp_table[minor].timeout));
436 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
437 if (parport_negotiate (lp_table[minor].dev->port,
438 IEEE1284_MODE_NIBBLE)) {
443 while (retval == 0) {
444 retval = parport_read (port, kbuf, count);
456 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
457 parport_negotiate (lp_table[minor].dev->port,
458 IEEE1284_MODE_COMPAT);
460 if (parport_negotiate (lp_table[minor].dev->port,
461 IEEE1284_MODE_NIBBLE)) {
466 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
467 schedule_timeout(LP_TIMEOUT_POLLED);
468 finish_wait(&lp_table[minor].waitq, &wait);
471 if (signal_pending (current)) {
472 retval = -ERESTARTSYS;
478 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
480 lp_release_parport (&lp_table[minor]);
482 if (retval > 0 && copy_to_user (buf, kbuf, retval))
485 up (&lp_table[minor].port_mutex);
490 #endif /* IEEE 1284 support */
492 static int lp_open(struct inode * inode, struct file * file)
494 unsigned int minor = iminor(inode);
498 if ((LP_F(minor) & LP_EXIST) == 0)
500 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
503 /* If ABORTOPEN is set and the printer is offline or out of paper,
504 we may still want to open it to perform ioctl()s. Therefore we
505 have commandeered O_NONBLOCK, even though it is being used in
506 a non-standard manner. This is strictly a Linux hack, and
507 should most likely only ever be used by the tunelp application. */
508 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
510 lp_claim_parport_or_block (&lp_table[minor]);
511 status = r_str(minor);
512 lp_release_parport (&lp_table[minor]);
513 if (status & LP_POUTPA) {
514 printk(KERN_INFO "lp%d out of paper\n", minor);
515 LP_F(minor) &= ~LP_BUSY;
517 } else if (!(status & LP_PSELECD)) {
518 printk(KERN_INFO "lp%d off-line\n", minor);
519 LP_F(minor) &= ~LP_BUSY;
521 } else if (!(status & LP_PERRORP)) {
522 printk(KERN_ERR "lp%d printer error\n", minor);
523 LP_F(minor) &= ~LP_BUSY;
527 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
528 if (!lp_table[minor].lp_buffer) {
529 LP_F(minor) &= ~LP_BUSY;
532 /* Determine if the peripheral supports ECP mode */
533 lp_claim_parport_or_block (&lp_table[minor]);
534 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
535 !parport_negotiate (lp_table[minor].dev->port,
536 IEEE1284_MODE_ECP)) {
537 printk (KERN_INFO "lp%d: ECP mode\n", minor);
538 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
540 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
542 /* Leave peripheral in compatibility mode */
543 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
544 lp_release_parport (&lp_table[minor]);
545 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
549 static int lp_release(struct inode * inode, struct file * file)
551 unsigned int minor = iminor(inode);
553 lp_claim_parport_or_block (&lp_table[minor]);
554 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
555 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
556 lp_release_parport (&lp_table[minor]);
557 kfree(lp_table[minor].lp_buffer);
558 lp_table[minor].lp_buffer = NULL;
559 LP_F(minor) &= ~LP_BUSY;
563 static int lp_ioctl(struct inode *inode, struct file *file,
564 unsigned int cmd, unsigned long arg)
566 unsigned int minor = iminor(inode);
569 void __user *argp = (void __user *)arg;
572 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
576 if ((LP_F(minor) & LP_EXIST) == 0)
579 struct timeval par_timeout;
583 LP_TIME(minor) = arg * HZ/100;
586 LP_CHAR(minor) = arg;
590 LP_F(minor) |= LP_ABORT;
592 LP_F(minor) &= ~LP_ABORT;
596 LP_F(minor) |= LP_ABORTOPEN;
598 LP_F(minor) &= ~LP_ABORTOPEN;
602 LP_F(minor) |= LP_CAREFUL;
604 LP_F(minor) &= ~LP_CAREFUL;
607 LP_WAIT(minor) = arg;
613 if (copy_to_user(argp, &LP_IRQ(minor),
618 lp_claim_parport_or_block (&lp_table[minor]);
619 status = r_str(minor);
620 lp_release_parport (&lp_table[minor]);
622 if (copy_to_user(argp, &status, sizeof(int)))
630 if (copy_to_user(argp, &LP_STAT(minor),
631 sizeof(struct lp_stats)))
633 if (capable(CAP_SYS_ADMIN))
634 memset(&LP_STAT(minor), 0,
635 sizeof(struct lp_stats));
639 status = LP_F(minor);
640 if (copy_to_user(argp, &status, sizeof(int)))
645 if (copy_from_user (&par_timeout, argp,
646 sizeof (struct timeval))) {
649 /* Convert to jiffies, place in lp_table */
650 if ((par_timeout.tv_sec < 0) ||
651 (par_timeout.tv_usec < 0)) {
654 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
655 to_jiffies += par_timeout.tv_sec * (long) HZ;
656 if (to_jiffies <= 0) {
659 lp_table[minor].timeout = to_jiffies;
668 static const struct file_operations lp_fops = {
669 .owner = THIS_MODULE,
673 .release = lp_release,
674 #ifdef CONFIG_PARPORT_1284
679 /* --- support for console on the line printer ----------------- */
681 #ifdef CONFIG_LP_CONSOLE
685 /* If the printer is out of paper, we can either lose the messages or
686 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
687 * non-zero to get the latter behaviour. */
688 #define CONSOLE_LP_STRICT 1
690 /* The console must be locked when we get here. */
692 static void lp_console_write (struct console *co, const char *s,
695 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
696 struct parport *port = dev->port;
699 if (parport_claim (dev))
700 /* Nothing we can do. */
703 parport_set_timeout (dev, 0);
705 /* Go to compatibility mode. */
706 parport_negotiate (port, IEEE1284_MODE_COMPAT);
709 /* Write the data, converting LF->CRLF as we go. */
710 ssize_t canwrite = count;
711 char *lf = memchr (s, '\n', count);
716 written = parport_write (port, s, canwrite);
726 if (lf && canwrite <= 0) {
727 const char *crlf = "\r\n";
730 /* Dodge the original '\n', and put '\r\n' instead. */
734 written = parport_write (port, crlf, i);
736 i -= written, crlf += written;
737 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
739 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
741 parport_release (dev);
744 static struct console lpcons = {
746 .write = lp_console_write,
747 .flags = CON_PRINTBUFFER,
750 #endif /* console on line printer */
752 /* --- initialisation code ------------------------------------- */
754 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
755 static char *parport[LP_NO] = { NULL, };
756 static int reset = 0;
758 module_param_array(parport, charp, NULL, 0);
759 module_param(reset, bool, 0);
762 static int __init lp_setup (char *str)
764 static int parport_ptr; // initially zero
767 if (get_option (&str, &x)) {
769 /* disable driver on "lp=" or "lp=0" */
770 parport_nr[0] = LP_PARPORT_OFF;
772 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
775 } else if (!strncmp(str, "parport", 7)) {
776 int n = simple_strtoul(str+7, NULL, 10);
777 if (parport_ptr < LP_NO)
778 parport_nr[parport_ptr++] = n;
780 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
782 } else if (!strcmp(str, "auto")) {
783 parport_nr[0] = LP_PARPORT_AUTO;
784 } else if (!strcmp(str, "none")) {
785 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
786 } else if (!strcmp(str, "reset")) {
793 static int lp_register(int nr, struct parport *port)
795 lp_table[nr].dev = parport_register_device(port, "lp",
796 lp_preempt, NULL, NULL, 0,
797 (void *) &lp_table[nr]);
798 if (lp_table[nr].dev == NULL)
800 lp_table[nr].flags |= LP_EXIST;
805 class_device_create(lp_class, NULL, MKDEV(LP_MAJOR, nr), port->dev,
808 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
809 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
811 #ifdef CONFIG_LP_CONSOLE
813 if (port->modes & PARPORT_MODE_SAFEININT) {
814 register_console (&lpcons);
815 console_registered = port;
816 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
818 printk (KERN_ERR "lp%d: cannot run console on %s\n",
819 CONSOLE_LP, port->name);
826 static void lp_attach (struct parport *port)
830 switch (parport_nr[0])
832 case LP_PARPORT_UNSPEC:
833 case LP_PARPORT_AUTO:
834 if (parport_nr[0] == LP_PARPORT_AUTO &&
835 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
837 if (lp_count == LP_NO) {
838 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
841 if (!lp_register(lp_count, port))
846 for (i = 0; i < LP_NO; i++) {
847 if (port->number == parport_nr[i]) {
848 if (!lp_register(i, port))
857 static void lp_detach (struct parport *port)
859 /* Write this some day. */
860 #ifdef CONFIG_LP_CONSOLE
861 if (console_registered == port) {
862 unregister_console (&lpcons);
863 console_registered = NULL;
865 #endif /* CONFIG_LP_CONSOLE */
868 static struct parport_driver lp_driver = {
874 static int __init lp_init (void)
878 if (parport_nr[0] == LP_PARPORT_OFF)
881 for (i = 0; i < LP_NO; i++) {
882 lp_table[i].dev = NULL;
883 lp_table[i].flags = 0;
884 lp_table[i].chars = LP_INIT_CHAR;
885 lp_table[i].time = LP_INIT_TIME;
886 lp_table[i].wait = LP_INIT_WAIT;
887 lp_table[i].lp_buffer = NULL;
889 lp_table[i].lastcall = 0;
890 lp_table[i].runchars = 0;
891 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
893 lp_table[i].last_error = 0;
894 init_waitqueue_head (&lp_table[i].waitq);
895 init_waitqueue_head (&lp_table[i].dataq);
896 init_MUTEX (&lp_table[i].port_mutex);
897 lp_table[i].timeout = 10 * HZ;
900 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
901 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
905 lp_class = class_create(THIS_MODULE, "printer");
906 if (IS_ERR(lp_class)) {
907 err = PTR_ERR(lp_class);
911 if (parport_register_driver (&lp_driver)) {
912 printk (KERN_ERR "lp: unable to register with parport\n");
918 printk (KERN_INFO "lp: driver loaded but no devices found\n");
919 #ifndef CONFIG_PARPORT_1284
920 if (parport_nr[0] == LP_PARPORT_AUTO)
921 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
928 class_destroy(lp_class);
930 unregister_chrdev(LP_MAJOR, "lp");
934 static int __init lp_init_module (void)
937 /* The user gave some parameters. Let's see what they were. */
938 if (!strncmp(parport[0], "auto", 4))
939 parport_nr[0] = LP_PARPORT_AUTO;
942 for (n = 0; n < LP_NO && parport[n]; n++) {
943 if (!strncmp(parport[n], "none", 4))
944 parport_nr[n] = LP_PARPORT_NONE;
947 unsigned long r = simple_strtoul(parport[n], &ep, 0);
948 if (ep != parport[n])
951 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
962 static void lp_cleanup_module (void)
966 parport_unregister_driver (&lp_driver);
968 #ifdef CONFIG_LP_CONSOLE
969 unregister_console (&lpcons);
972 unregister_chrdev(LP_MAJOR, "lp");
973 for (offset = 0; offset < LP_NO; offset++) {
974 if (lp_table[offset].dev == NULL)
976 parport_unregister_device(lp_table[offset].dev);
977 class_device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
979 class_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");