1 // SPDX-License-Identifier: GPL-2.0-only
3 * Generic parallel printer driver
5 * Copyright (C) 1992 by Jim Weigand and Linus Torvalds
6 * Copyright (C) 1992,1993 by Michael K. Johnson
7 * - Thanks much to Gunter Windau for pointing out to me where the error
8 * checking ought to be.
9 * Copyright (C) 1993 by Nigel Gamble (added interrupt code)
10 * Copyright (C) 1994 by Alan Cox (Modularised it)
11 * LPCAREFUL, LPABORT, LPGETSTATUS added by Chris Metcalf, metcalf@lcs.mit.edu
12 * Statistics and support for slow printers by Rob Janssen, rob@knoware.nl
13 * "lp=" command line parameters added by Grant Guenther, grant@torque.net
14 * lp_read (Status readback) support added by Carsten Gross,
15 * carsten@sol.wohnheim.uni-ulm.de
16 * Support for parport by Philip Blundell <philb@gnu.org>
17 * Parport sharing hacking by Andrea Arcangeli
18 * Fixed kernel_(to/from)_user memory copy to check for errors
19 * by Riccardo Facchetti <fizban@tin.it>
20 * 22-JAN-1998 Added support for devfs Richard Gooch <rgooch@atnf.csiro.au>
21 * Redesigned interrupt handling for handle printers with buggy handshake
22 * by Andrea Arcangeli, 11 May 1998
23 * Full efficient handling of printer with buggy irq handshake (now I have
24 * understood the meaning of the strange handshake). This is done sending new
25 * characters if the interrupt is just happened, even if the printer say to
26 * be still BUSY. This is needed at least with Epson Stylus Color. To enable
27 * the new TRUST_IRQ mode read the `LP OPTIMIZATION' section below...
28 * Fixed the irq on the rising edge of the strobe case.
29 * Obsoleted the CAREFUL flag since a printer that doesn' t work with
30 * CAREFUL will block a bit after in lp_check_status().
31 * Andrea Arcangeli, 15 Oct 1998
32 * Obsoleted and removed all the lowlevel stuff implemented in the last
33 * month to use the IEEE1284 functions (that handle the _new_ compatibilty
37 /* This driver should, in theory, work with any parallel port that has an
38 * appropriate low-level driver; all I/O is done through the parport
41 * If this driver is built into the kernel, you can configure it using the
42 * kernel command-line. For example:
44 * lp=parport1,none,parport2 (bind lp0 to parport1, disable lp1 and
45 * bind lp2 to parport2)
47 * lp=auto (assign lp devices to all ports that
48 * have printers attached, as determined
49 * by the IEEE-1284 autoprobe)
51 * lp=reset (reset the printer during
54 * lp=off (disable the printer driver entirely)
56 * If the driver is loaded as a module, similar functionality is available
57 * using module parameters. The equivalent of the above commands would be:
59 * # insmod lp.o parport=1,none,2
61 * # insmod lp.o parport=auto
63 * # insmod lp.o reset=1
66 /* COMPATIBILITY WITH OLD KERNELS
68 * Under Linux 2.0 and previous versions, lp devices were bound to ports at
69 * particular I/O addresses, as follows:
75 * The new driver, by default, binds lp devices to parport devices as it
76 * finds them. This means that if you only have one port, it will be bound
77 * to lp0 regardless of its I/O address. If you need the old behaviour, you
78 * can force it using the parameters described above.
82 * The new interrupt handling code take care of the buggy handshake
83 * of some HP and Epson printer:
85 * ACK _______________ ___________
88 * BUSY _________ _______
91 * I discovered this using the printer scanner that you can find at:
93 * ftp://e-mind.com/pub/linux/pscan/
95 * 11 May 98, Andrea Arcangeli
97 * My printer scanner run on an Epson Stylus Color show that such printer
98 * generates the irq on the _rising_ edge of the STROBE. Now lp handle
101 * 15 Oct 1998, Andrea Arcangeli
103 * The so called `buggy' handshake is really the well documented
104 * compatibility mode IEEE1284 handshake. They changed the well known
105 * Centronics handshake acking in the middle of busy expecting to not
106 * break drivers or legacy application, while they broken linux lp
107 * until I fixed it reverse engineering the protocol by hand some
110 * 14 Dec 1998, Andrea Arcangeli
112 * Copyright (C) 2000 by Tim Waugh (added LPSETTIMEOUT ioctl)
115 #include <linux/module.h>
116 #include <linux/init.h>
118 #include <linux/errno.h>
119 #include <linux/kernel.h>
120 #include <linux/major.h>
121 #include <linux/sched/signal.h>
122 #include <linux/slab.h>
123 #include <linux/fcntl.h>
124 #include <linux/delay.h>
125 #include <linux/poll.h>
126 #include <linux/console.h>
127 #include <linux/device.h>
128 #include <linux/wait.h>
129 #include <linux/jiffies.h>
130 #include <linux/mutex.h>
131 #include <linux/compat.h>
133 #include <linux/parport.h>
135 #include <linux/lp.h>
138 #include <linux/uaccess.h>
140 /* if you have more than 8 printers, remember to increase LP_NO */
143 static DEFINE_MUTEX(lp_mutex);
144 static struct lp_struct lp_table[LP_NO];
145 static int port_num[LP_NO];
147 static unsigned int lp_count = 0;
148 static struct class *lp_class;
150 #ifdef CONFIG_LP_CONSOLE
151 static struct parport *console_registered;
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)
224 if (LP_F(minor) & LP_ABORT)
227 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
229 lp_release_parport(&lp_table[minor]);
230 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
231 schedule_timeout(LP_TIMEOUT_POLLED);
232 finish_wait(&lp_table[minor].waitq, &wait);
234 lp_claim_parport_or_block(&lp_table[minor]);
236 parport_yield_blocking(lp_table[minor].dev);
239 static int lp_check_status(int minor)
242 unsigned int last = lp_table[minor].last_error;
243 unsigned char status = r_str(minor);
244 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
247 else if ((status & LP_POUTPA)) {
248 if (last != LP_POUTPA) {
250 printk(KERN_INFO "lp%d out of paper\n", minor);
253 } else if (!(status & LP_PSELECD)) {
254 if (last != LP_PSELECD) {
256 printk(KERN_INFO "lp%d off-line\n", minor);
259 } else if (!(status & LP_PERRORP)) {
260 if (last != LP_PERRORP) {
262 printk(KERN_INFO "lp%d on fire\n", minor);
266 last = 0; /* Come here if LP_CAREFUL is set and no
267 errors are reported. */
270 lp_table[minor].last_error = last;
278 static int lp_wait_ready(int minor, int nonblock)
282 /* If we're not in compatibility mode, we're ready now! */
283 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
288 error = lp_check_status(minor);
289 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
291 if (signal_pending(current)) {
299 static ssize_t lp_write(struct file *file, const char __user *buf,
300 size_t count, loff_t *ppos)
302 unsigned int minor = iminor(file_inode(file));
303 struct parport *port = lp_table[minor].dev->port;
304 char *kbuf = lp_table[minor].lp_buffer;
307 size_t copy_size = count;
308 int nonblock = ((file->f_flags & O_NONBLOCK) ||
309 (LP_F(minor) & LP_ABORT));
312 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
313 lp_table[minor].runchars = 0;
315 lp_table[minor].lastcall = jiffies;
318 /* Need to copy the data from user-space. */
319 if (copy_size > LP_BUFFER_SIZE)
320 copy_size = LP_BUFFER_SIZE;
322 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
325 if (copy_from_user(kbuf, buf, copy_size)) {
330 /* Claim Parport or sleep until it becomes available
332 lp_claim_parport_or_block(&lp_table[minor]);
333 /* Go to the proper mode. */
334 lp_table[minor].current_mode = lp_negotiate(port,
335 lp_table[minor].best_mode);
337 parport_set_timeout(lp_table[minor].dev,
338 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
339 : lp_table[minor].timeout));
341 if ((retv = lp_wait_ready(minor, nonblock)) == 0)
343 /* Write the data. */
344 written = parport_write(port, kbuf, copy_size);
346 copy_size -= written;
352 if (signal_pending(current)) {
360 /* incomplete write -> check error ! */
363 parport_negotiate(lp_table[minor].dev->port,
364 IEEE1284_MODE_COMPAT);
365 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
367 error = lp_wait_ready(minor, nonblock);
373 } else if (nonblock) {
379 parport_yield_blocking(lp_table[minor].dev);
380 lp_table[minor].current_mode
382 lp_table[minor].best_mode);
384 } else if (need_resched())
389 if (copy_size > LP_BUFFER_SIZE)
390 copy_size = LP_BUFFER_SIZE;
392 if (copy_from_user(kbuf, buf, copy_size)) {
400 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
401 &lp_table[minor].bits)) {
402 printk(KERN_INFO "lp%d releasing parport\n", minor);
403 parport_negotiate(lp_table[minor].dev->port,
404 IEEE1284_MODE_COMPAT);
405 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
406 lp_release_parport(&lp_table[minor]);
409 mutex_unlock(&lp_table[minor].port_mutex);
414 #ifdef CONFIG_PARPORT_1284
416 /* Status readback conforming to ieee1284 */
417 static ssize_t lp_read(struct file *file, char __user *buf,
418 size_t count, loff_t *ppos)
421 unsigned int minor=iminor(file_inode(file));
422 struct parport *port = lp_table[minor].dev->port;
424 char *kbuf = lp_table[minor].lp_buffer;
425 int nonblock = ((file->f_flags & O_NONBLOCK) ||
426 (LP_F(minor) & LP_ABORT));
428 if (count > LP_BUFFER_SIZE)
429 count = LP_BUFFER_SIZE;
431 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
434 lp_claim_parport_or_block(&lp_table[minor]);
436 parport_set_timeout(lp_table[minor].dev,
437 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
438 : lp_table[minor].timeout));
440 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
441 if (parport_negotiate(lp_table[minor].dev->port,
442 IEEE1284_MODE_NIBBLE)) {
447 while (retval == 0) {
448 retval = parport_read(port, kbuf, count);
460 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
461 parport_negotiate(lp_table[minor].dev->port,
462 IEEE1284_MODE_COMPAT);
464 if (parport_negotiate(lp_table[minor].dev->port,
465 IEEE1284_MODE_NIBBLE)) {
470 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
471 schedule_timeout(LP_TIMEOUT_POLLED);
472 finish_wait(&lp_table[minor].waitq, &wait);
475 if (signal_pending(current)) {
476 retval = -ERESTARTSYS;
482 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
484 lp_release_parport(&lp_table[minor]);
486 if (retval > 0 && copy_to_user(buf, kbuf, retval))
489 mutex_unlock(&lp_table[minor].port_mutex);
494 #endif /* IEEE 1284 support */
496 static int lp_open(struct inode *inode, struct file *file)
498 unsigned int minor = iminor(inode);
501 mutex_lock(&lp_mutex);
502 if (minor >= LP_NO) {
506 if ((LP_F(minor) & LP_EXIST) == 0) {
510 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) {
514 /* If ABORTOPEN is set and the printer is offline or out of paper,
515 we may still want to open it to perform ioctl()s. Therefore we
516 have commandeered O_NONBLOCK, even though it is being used in
517 a non-standard manner. This is strictly a Linux hack, and
518 should most likely only ever be used by the tunelp application. */
519 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
521 lp_claim_parport_or_block(&lp_table[minor]);
522 status = r_str(minor);
523 lp_release_parport(&lp_table[minor]);
524 if (status & LP_POUTPA) {
525 printk(KERN_INFO "lp%d out of paper\n", minor);
526 LP_F(minor) &= ~LP_BUSY;
529 } else if (!(status & LP_PSELECD)) {
530 printk(KERN_INFO "lp%d off-line\n", minor);
531 LP_F(minor) &= ~LP_BUSY;
534 } else if (!(status & LP_PERRORP)) {
535 printk(KERN_ERR "lp%d printer error\n", minor);
536 LP_F(minor) &= ~LP_BUSY;
541 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
542 if (!lp_table[minor].lp_buffer) {
543 LP_F(minor) &= ~LP_BUSY;
547 /* Determine if the peripheral supports ECP mode */
548 lp_claim_parport_or_block(&lp_table[minor]);
549 if ((lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
550 !parport_negotiate(lp_table[minor].dev->port,
551 IEEE1284_MODE_ECP)) {
552 printk(KERN_INFO "lp%d: ECP mode\n", minor);
553 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
555 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
557 /* Leave peripheral in compatibility mode */
558 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
559 lp_release_parport(&lp_table[minor]);
560 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
562 mutex_unlock(&lp_mutex);
566 static int lp_release(struct inode *inode, struct file *file)
568 unsigned int minor = iminor(inode);
570 lp_claim_parport_or_block(&lp_table[minor]);
571 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
572 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
573 lp_release_parport(&lp_table[minor]);
574 kfree(lp_table[minor].lp_buffer);
575 lp_table[minor].lp_buffer = NULL;
576 LP_F(minor) &= ~LP_BUSY;
580 static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
581 unsigned long arg, void __user *argp)
587 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
591 if ((LP_F(minor) & LP_EXIST) == 0)
595 if (arg > UINT_MAX / HZ)
597 LP_TIME(minor) = arg * HZ/100;
600 LP_CHAR(minor) = arg;
604 LP_F(minor) |= LP_ABORT;
606 LP_F(minor) &= ~LP_ABORT;
610 LP_F(minor) |= LP_ABORTOPEN;
612 LP_F(minor) &= ~LP_ABORTOPEN;
616 LP_F(minor) |= LP_CAREFUL;
618 LP_F(minor) &= ~LP_CAREFUL;
621 LP_WAIT(minor) = arg;
626 if (copy_to_user(argp, &LP_IRQ(minor),
631 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
633 lp_claim_parport_or_block(&lp_table[minor]);
634 status = r_str(minor);
635 lp_release_parport(&lp_table[minor]);
636 mutex_unlock(&lp_table[minor].port_mutex);
638 if (copy_to_user(argp, &status, sizeof(int)))
646 if (copy_to_user(argp, &LP_STAT(minor),
647 sizeof(struct lp_stats)))
649 if (capable(CAP_SYS_ADMIN))
650 memset(&LP_STAT(minor), 0,
651 sizeof(struct lp_stats));
655 status = LP_F(minor);
656 if (copy_to_user(argp, &status, sizeof(int)))
666 static int lp_set_timeout(unsigned int minor, s64 tv_sec, long tv_usec)
670 /* Convert to jiffies, place in lp_table */
671 if (tv_sec < 0 || tv_usec < 0)
675 * we used to not check, so let's not make this fatal,
676 * but deal with user space passing a 32-bit tv_nsec in
677 * a 64-bit field, capping the timeout to 1 second
678 * worth of microseconds, and capping the total at
681 if (tv_usec > 999999)
684 if (tv_sec >= MAX_SEC_IN_JIFFIES - 1) {
685 to_jiffies = MAX_JIFFY_OFFSET;
687 to_jiffies = DIV_ROUND_UP(tv_usec, 1000000/HZ);
688 to_jiffies += tv_sec * (long) HZ;
691 if (to_jiffies <= 0) {
694 lp_table[minor].timeout = to_jiffies;
698 static int lp_set_timeout32(unsigned int minor, void __user *arg)
702 if (copy_from_user(karg, arg, sizeof(karg)))
705 return lp_set_timeout(minor, karg[0], karg[1]);
708 static int lp_set_timeout64(unsigned int minor, void __user *arg)
712 if (copy_from_user(karg, arg, sizeof(karg)))
715 /* sparc64 suseconds_t is 32-bit only */
716 if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall())
719 return lp_set_timeout(minor, karg[0], karg[1]);
722 static long lp_ioctl(struct file *file, unsigned int cmd,
728 minor = iminor(file_inode(file));
729 mutex_lock(&lp_mutex);
731 case LPSETTIMEOUT_OLD:
732 if (BITS_PER_LONG == 32) {
733 ret = lp_set_timeout32(minor, (void __user *)arg);
736 fallthrough; /* for 64-bit */
737 case LPSETTIMEOUT_NEW:
738 ret = lp_set_timeout64(minor, (void __user *)arg);
741 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
744 mutex_unlock(&lp_mutex);
750 static long lp_compat_ioctl(struct file *file, unsigned int cmd,
756 minor = iminor(file_inode(file));
757 mutex_lock(&lp_mutex);
759 case LPSETTIMEOUT_OLD:
760 if (!COMPAT_USE_64BIT_TIME) {
761 ret = lp_set_timeout32(minor, (void __user *)arg);
764 fallthrough; /* for x32 mode */
765 case LPSETTIMEOUT_NEW:
766 ret = lp_set_timeout64(minor, (void __user *)arg);
770 /* FIXME: add an implementation if you set LP_STATS */
775 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
778 mutex_unlock(&lp_mutex);
784 static const struct file_operations lp_fops = {
785 .owner = THIS_MODULE,
787 .unlocked_ioctl = lp_ioctl,
789 .compat_ioctl = lp_compat_ioctl,
792 .release = lp_release,
793 #ifdef CONFIG_PARPORT_1284
796 .llseek = noop_llseek,
799 /* --- support for console on the line printer ----------------- */
801 #ifdef CONFIG_LP_CONSOLE
805 /* If the printer is out of paper, we can either lose the messages or
806 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
807 * non-zero to get the latter behaviour. */
808 #define CONSOLE_LP_STRICT 1
810 /* The console must be locked when we get here. */
812 static void lp_console_write(struct console *co, const char *s,
815 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
816 struct parport *port = dev->port;
819 if (parport_claim(dev))
820 /* Nothing we can do. */
823 parport_set_timeout(dev, 0);
825 /* Go to compatibility mode. */
826 parport_negotiate(port, IEEE1284_MODE_COMPAT);
829 /* Write the data, converting LF->CRLF as we go. */
830 ssize_t canwrite = count;
831 char *lf = memchr(s, '\n', count);
836 written = parport_write(port, s, canwrite);
846 if (lf && canwrite <= 0) {
847 const char *crlf = "\r\n";
850 /* Dodge the original '\n', and put '\r\n' instead. */
854 written = parport_write(port, crlf, i);
859 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
861 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
863 parport_release(dev);
866 static struct console lpcons = {
868 .write = lp_console_write,
869 .flags = CON_PRINTBUFFER,
872 #endif /* console on line printer */
874 /* --- initialisation code ------------------------------------- */
876 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
877 static char *parport[LP_NO];
880 module_param_array(parport, charp, NULL, 0);
881 module_param(reset, bool, 0);
884 static int __init lp_setup(char *str)
886 static int parport_ptr;
889 if (get_option(&str, &x)) {
891 /* disable driver on "lp=" or "lp=0" */
892 parport_nr[0] = LP_PARPORT_OFF;
894 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
897 } else if (!strncmp(str, "parport", 7)) {
898 int n = simple_strtoul(str+7, NULL, 10);
899 if (parport_ptr < LP_NO)
900 parport_nr[parport_ptr++] = n;
902 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
904 } else if (!strcmp(str, "auto")) {
905 parport_nr[0] = LP_PARPORT_AUTO;
906 } else if (!strcmp(str, "none")) {
907 if (parport_ptr < LP_NO)
908 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
910 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
912 } else if (!strcmp(str, "reset")) {
919 static int lp_register(int nr, struct parport *port)
921 struct pardev_cb ppdev_cb;
923 memset(&ppdev_cb, 0, sizeof(ppdev_cb));
924 ppdev_cb.preempt = lp_preempt;
925 ppdev_cb.private = &lp_table[nr];
926 lp_table[nr].dev = parport_register_dev_model(port, "lp",
928 if (lp_table[nr].dev == NULL)
930 lp_table[nr].flags |= LP_EXIST;
935 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
938 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
939 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
941 #ifdef CONFIG_LP_CONSOLE
943 if (port->modes & PARPORT_MODE_SAFEININT) {
944 register_console(&lpcons);
945 console_registered = port;
946 printk(KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
948 printk(KERN_ERR "lp%d: cannot run console on %s\n",
949 CONSOLE_LP, port->name);
952 port_num[nr] = port->number;
957 static void lp_attach(struct parport *port)
961 switch (parport_nr[0]) {
962 case LP_PARPORT_UNSPEC:
963 case LP_PARPORT_AUTO:
964 if (parport_nr[0] == LP_PARPORT_AUTO &&
965 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
967 if (lp_count == LP_NO) {
968 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
971 for (i = 0; i < LP_NO; i++)
972 if (port_num[i] == -1)
975 if (!lp_register(i, port))
980 for (i = 0; i < LP_NO; i++) {
981 if (port->number == parport_nr[i]) {
982 if (!lp_register(i, port))
991 static void lp_detach(struct parport *port)
995 /* Write this some day. */
996 #ifdef CONFIG_LP_CONSOLE
997 if (console_registered == port) {
998 unregister_console(&lpcons);
999 console_registered = NULL;
1001 #endif /* CONFIG_LP_CONSOLE */
1003 for (n = 0; n < LP_NO; n++) {
1004 if (port_num[n] == port->number) {
1007 device_destroy(lp_class, MKDEV(LP_MAJOR, n));
1008 parport_unregister_device(lp_table[n].dev);
1013 static struct parport_driver lp_driver = {
1015 .match_port = lp_attach,
1016 .detach = lp_detach,
1020 static int __init lp_init(void)
1024 if (parport_nr[0] == LP_PARPORT_OFF)
1027 for (i = 0; i < LP_NO; i++) {
1028 lp_table[i].dev = NULL;
1029 lp_table[i].flags = 0;
1030 lp_table[i].chars = LP_INIT_CHAR;
1031 lp_table[i].time = LP_INIT_TIME;
1032 lp_table[i].wait = LP_INIT_WAIT;
1033 lp_table[i].lp_buffer = NULL;
1035 lp_table[i].lastcall = 0;
1036 lp_table[i].runchars = 0;
1037 memset(&lp_table[i].stats, 0, sizeof(struct lp_stats));
1039 lp_table[i].last_error = 0;
1040 init_waitqueue_head(&lp_table[i].waitq);
1041 init_waitqueue_head(&lp_table[i].dataq);
1042 mutex_init(&lp_table[i].port_mutex);
1043 lp_table[i].timeout = 10 * HZ;
1047 if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) {
1048 printk(KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
1052 lp_class = class_create(THIS_MODULE, "printer");
1053 if (IS_ERR(lp_class)) {
1054 err = PTR_ERR(lp_class);
1058 if (parport_register_driver(&lp_driver)) {
1059 printk(KERN_ERR "lp: unable to register with parport\n");
1065 printk(KERN_INFO "lp: driver loaded but no devices found\n");
1066 #ifndef CONFIG_PARPORT_1284
1067 if (parport_nr[0] == LP_PARPORT_AUTO)
1068 printk(KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
1075 class_destroy(lp_class);
1077 unregister_chrdev(LP_MAJOR, "lp");
1081 static int __init lp_init_module(void)
1084 /* The user gave some parameters. Let's see what they were. */
1085 if (!strncmp(parport[0], "auto", 4))
1086 parport_nr[0] = LP_PARPORT_AUTO;
1089 for (n = 0; n < LP_NO && parport[n]; n++) {
1090 if (!strncmp(parport[n], "none", 4))
1091 parport_nr[n] = LP_PARPORT_NONE;
1094 unsigned long r = simple_strtoul(parport[n], &ep, 0);
1095 if (ep != parport[n])
1098 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
1109 static void lp_cleanup_module(void)
1111 parport_unregister_driver(&lp_driver);
1113 #ifdef CONFIG_LP_CONSOLE
1114 unregister_console(&lpcons);
1117 unregister_chrdev(LP_MAJOR, "lp");
1118 class_destroy(lp_class);
1121 __setup("lp=", lp_setup);
1122 module_init(lp_init_module);
1123 module_exit(lp_cleanup_module);
1125 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
1126 MODULE_LICENSE("GPL");