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>
129 #include <linux/mutex.h>
130 #include <linux/compat.h>
132 #include <linux/parport.h>
134 #include <linux/lp.h>
137 #include <asm/uaccess.h>
139 /* if you have more than 8 printers, remember to increase LP_NO */
142 static DEFINE_MUTEX(lp_mutex);
143 static struct lp_struct lp_table[LP_NO];
145 static unsigned int lp_count = 0;
146 static struct class *lp_class;
148 #ifdef CONFIG_LP_CONSOLE
149 static struct parport *console_registered;
150 #endif /* CONFIG_LP_CONSOLE */
154 /* Bits used to manage claiming the parport device */
155 #define LP_PREEMPT_REQUEST 1
156 #define LP_PARPORT_CLAIMED 2
158 /* --- low-level port access ----------------------------------- */
160 #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
161 #define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
162 #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
163 #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
165 /* Claim the parport or block trying unless we've already claimed it */
166 static void lp_claim_parport_or_block(struct lp_struct *this_lp)
168 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
169 parport_claim_or_block (this_lp->dev);
173 /* Claim the parport or block trying unless we've already claimed it */
174 static void lp_release_parport(struct lp_struct *this_lp)
176 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
177 parport_release (this_lp->dev);
183 static int lp_preempt(void *handle)
185 struct lp_struct *this_lp = (struct lp_struct *)handle;
186 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
192 * Try to negotiate to a new mode; if unsuccessful negotiate to
193 * compatibility mode. Return the mode we ended up in.
195 static int lp_negotiate(struct parport * port, int mode)
197 if (parport_negotiate (port, mode) != 0) {
198 mode = IEEE1284_MODE_COMPAT;
199 parport_negotiate (port, mode);
205 static int lp_reset(int minor)
208 lp_claim_parport_or_block (&lp_table[minor]);
209 w_ctr(minor, LP_PSELECP);
211 w_ctr(minor, LP_PSELECP | LP_PINITP);
212 retval = r_str(minor);
213 lp_release_parport (&lp_table[minor]);
217 static void lp_error (int minor)
222 if (LP_F(minor) & LP_ABORT)
225 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
226 if (polling) lp_release_parport (&lp_table[minor]);
227 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
228 schedule_timeout(LP_TIMEOUT_POLLED);
229 finish_wait(&lp_table[minor].waitq, &wait);
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_inode(file));
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 (time_after(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 (mutex_lock_interruptible(&lp_table[minor].port_mutex))
320 if (copy_from_user (kbuf, buf, copy_size)) {
325 /* Claim Parport or sleep until it becomes available
327 lp_claim_parport_or_block (&lp_table[minor]);
328 /* Go to the proper mode. */
329 lp_table[minor].current_mode = lp_negotiate (port,
330 lp_table[minor].best_mode);
332 parport_set_timeout (lp_table[minor].dev,
333 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
334 : lp_table[minor].timeout));
336 if ((retv = lp_wait_ready (minor, nonblock)) == 0)
338 /* Write the data. */
339 written = parport_write (port, kbuf, copy_size);
341 copy_size -= written;
347 if (signal_pending (current)) {
355 /* incomplete write -> check error ! */
358 parport_negotiate (lp_table[minor].dev->port,
359 IEEE1284_MODE_COMPAT);
360 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
362 error = lp_wait_ready (minor, nonblock);
368 } else if (nonblock) {
374 parport_yield_blocking (lp_table[minor].dev);
375 lp_table[minor].current_mode
376 = lp_negotiate (port,
377 lp_table[minor].best_mode);
379 } else if (need_resched())
384 if (copy_size > LP_BUFFER_SIZE)
385 copy_size = LP_BUFFER_SIZE;
387 if (copy_from_user(kbuf, buf, copy_size)) {
395 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
396 &lp_table[minor].bits)) {
397 printk(KERN_INFO "lp%d releasing parport\n", minor);
398 parport_negotiate (lp_table[minor].dev->port,
399 IEEE1284_MODE_COMPAT);
400 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
401 lp_release_parport (&lp_table[minor]);
404 mutex_unlock(&lp_table[minor].port_mutex);
409 #ifdef CONFIG_PARPORT_1284
411 /* Status readback conforming to ieee1284 */
412 static ssize_t lp_read(struct file * file, char __user * buf,
413 size_t count, loff_t *ppos)
416 unsigned int minor=iminor(file_inode(file));
417 struct parport *port = lp_table[minor].dev->port;
419 char *kbuf = lp_table[minor].lp_buffer;
420 int nonblock = ((file->f_flags & O_NONBLOCK) ||
421 (LP_F(minor) & LP_ABORT));
423 if (count > LP_BUFFER_SIZE)
424 count = LP_BUFFER_SIZE;
426 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
429 lp_claim_parport_or_block (&lp_table[minor]);
431 parport_set_timeout (lp_table[minor].dev,
432 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
433 : lp_table[minor].timeout));
435 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
436 if (parport_negotiate (lp_table[minor].dev->port,
437 IEEE1284_MODE_NIBBLE)) {
442 while (retval == 0) {
443 retval = parport_read (port, kbuf, count);
455 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
456 parport_negotiate (lp_table[minor].dev->port,
457 IEEE1284_MODE_COMPAT);
459 if (parport_negotiate (lp_table[minor].dev->port,
460 IEEE1284_MODE_NIBBLE)) {
465 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
466 schedule_timeout(LP_TIMEOUT_POLLED);
467 finish_wait(&lp_table[minor].waitq, &wait);
470 if (signal_pending (current)) {
471 retval = -ERESTARTSYS;
477 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
479 lp_release_parport (&lp_table[minor]);
481 if (retval > 0 && copy_to_user (buf, kbuf, retval))
484 mutex_unlock(&lp_table[minor].port_mutex);
489 #endif /* IEEE 1284 support */
491 static int lp_open(struct inode * inode, struct file * file)
493 unsigned int minor = iminor(inode);
496 mutex_lock(&lp_mutex);
497 if (minor >= LP_NO) {
501 if ((LP_F(minor) & LP_EXIST) == 0) {
505 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) {
509 /* If ABORTOPEN is set and the printer is offline or out of paper,
510 we may still want to open it to perform ioctl()s. Therefore we
511 have commandeered O_NONBLOCK, even though it is being used in
512 a non-standard manner. This is strictly a Linux hack, and
513 should most likely only ever be used by the tunelp application. */
514 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
516 lp_claim_parport_or_block (&lp_table[minor]);
517 status = r_str(minor);
518 lp_release_parport (&lp_table[minor]);
519 if (status & LP_POUTPA) {
520 printk(KERN_INFO "lp%d out of paper\n", minor);
521 LP_F(minor) &= ~LP_BUSY;
524 } else if (!(status & LP_PSELECD)) {
525 printk(KERN_INFO "lp%d off-line\n", minor);
526 LP_F(minor) &= ~LP_BUSY;
529 } else if (!(status & LP_PERRORP)) {
530 printk(KERN_ERR "lp%d printer error\n", minor);
531 LP_F(minor) &= ~LP_BUSY;
536 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
537 if (!lp_table[minor].lp_buffer) {
538 LP_F(minor) &= ~LP_BUSY;
542 /* Determine if the peripheral supports ECP mode */
543 lp_claim_parport_or_block (&lp_table[minor]);
544 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
545 !parport_negotiate (lp_table[minor].dev->port,
546 IEEE1284_MODE_ECP)) {
547 printk (KERN_INFO "lp%d: ECP mode\n", minor);
548 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
550 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
552 /* Leave peripheral in compatibility mode */
553 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
554 lp_release_parport (&lp_table[minor]);
555 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
557 mutex_unlock(&lp_mutex);
561 static int lp_release(struct inode * inode, struct file * file)
563 unsigned int minor = iminor(inode);
565 lp_claim_parport_or_block (&lp_table[minor]);
566 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
567 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
568 lp_release_parport (&lp_table[minor]);
569 kfree(lp_table[minor].lp_buffer);
570 lp_table[minor].lp_buffer = NULL;
571 LP_F(minor) &= ~LP_BUSY;
575 static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
576 unsigned long arg, void __user *argp)
582 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
586 if ((LP_F(minor) & LP_EXIST) == 0)
590 if (arg > UINT_MAX / HZ)
592 LP_TIME(minor) = arg * HZ/100;
595 LP_CHAR(minor) = arg;
599 LP_F(minor) |= LP_ABORT;
601 LP_F(minor) &= ~LP_ABORT;
605 LP_F(minor) |= LP_ABORTOPEN;
607 LP_F(minor) &= ~LP_ABORTOPEN;
611 LP_F(minor) |= LP_CAREFUL;
613 LP_F(minor) &= ~LP_CAREFUL;
616 LP_WAIT(minor) = arg;
622 if (copy_to_user(argp, &LP_IRQ(minor),
627 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
629 lp_claim_parport_or_block (&lp_table[minor]);
630 status = r_str(minor);
631 lp_release_parport (&lp_table[minor]);
632 mutex_unlock(&lp_table[minor].port_mutex);
634 if (copy_to_user(argp, &status, sizeof(int)))
642 if (copy_to_user(argp, &LP_STAT(minor),
643 sizeof(struct lp_stats)))
645 if (capable(CAP_SYS_ADMIN))
646 memset(&LP_STAT(minor), 0,
647 sizeof(struct lp_stats));
651 status = LP_F(minor);
652 if (copy_to_user(argp, &status, sizeof(int)))
662 static int lp_set_timeout(unsigned int minor, struct timeval *par_timeout)
666 /* Convert to jiffies, place in lp_table */
667 if ((par_timeout->tv_sec < 0) ||
668 (par_timeout->tv_usec < 0)) {
671 to_jiffies = DIV_ROUND_UP(par_timeout->tv_usec, 1000000/HZ);
672 to_jiffies += par_timeout->tv_sec * (long) HZ;
673 if (to_jiffies <= 0) {
676 lp_table[minor].timeout = to_jiffies;
680 static long lp_ioctl(struct file *file, unsigned int cmd,
684 struct timeval par_timeout;
687 minor = iminor(file_inode(file));
688 mutex_lock(&lp_mutex);
691 if (copy_from_user(&par_timeout, (void __user *)arg,
692 sizeof (struct timeval))) {
696 ret = lp_set_timeout(minor, &par_timeout);
699 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
702 mutex_unlock(&lp_mutex);
708 static long lp_compat_ioctl(struct file *file, unsigned int cmd,
712 struct timeval par_timeout;
715 minor = iminor(file_inode(file));
716 mutex_lock(&lp_mutex);
719 if (compat_get_timeval(&par_timeout, compat_ptr(arg))) {
723 ret = lp_set_timeout(minor, &par_timeout);
727 /* FIXME: add an implementation if you set LP_STATS */
732 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
735 mutex_unlock(&lp_mutex);
741 static const struct file_operations lp_fops = {
742 .owner = THIS_MODULE,
744 .unlocked_ioctl = lp_ioctl,
746 .compat_ioctl = lp_compat_ioctl,
749 .release = lp_release,
750 #ifdef CONFIG_PARPORT_1284
753 .llseek = noop_llseek,
756 /* --- support for console on the line printer ----------------- */
758 #ifdef CONFIG_LP_CONSOLE
762 /* If the printer is out of paper, we can either lose the messages or
763 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
764 * non-zero to get the latter behaviour. */
765 #define CONSOLE_LP_STRICT 1
767 /* The console must be locked when we get here. */
769 static void lp_console_write (struct console *co, const char *s,
772 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
773 struct parport *port = dev->port;
776 if (parport_claim (dev))
777 /* Nothing we can do. */
780 parport_set_timeout (dev, 0);
782 /* Go to compatibility mode. */
783 parport_negotiate (port, IEEE1284_MODE_COMPAT);
786 /* Write the data, converting LF->CRLF as we go. */
787 ssize_t canwrite = count;
788 char *lf = memchr (s, '\n', count);
793 written = parport_write (port, s, canwrite);
803 if (lf && canwrite <= 0) {
804 const char *crlf = "\r\n";
807 /* Dodge the original '\n', and put '\r\n' instead. */
811 written = parport_write (port, crlf, i);
813 i -= written, crlf += written;
814 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
816 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
818 parport_release (dev);
821 static struct console lpcons = {
823 .write = lp_console_write,
824 .flags = CON_PRINTBUFFER,
827 #endif /* console on line printer */
829 /* --- initialisation code ------------------------------------- */
831 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
832 static char *parport[LP_NO];
835 module_param_array(parport, charp, NULL, 0);
836 module_param(reset, bool, 0);
839 static int __init lp_setup (char *str)
841 static int parport_ptr;
844 if (get_option(&str, &x)) {
846 /* disable driver on "lp=" or "lp=0" */
847 parport_nr[0] = LP_PARPORT_OFF;
849 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
852 } else if (!strncmp(str, "parport", 7)) {
853 int n = simple_strtoul(str+7, NULL, 10);
854 if (parport_ptr < LP_NO)
855 parport_nr[parport_ptr++] = n;
857 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
859 } else if (!strcmp(str, "auto")) {
860 parport_nr[0] = LP_PARPORT_AUTO;
861 } else if (!strcmp(str, "none")) {
862 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
863 } else if (!strcmp(str, "reset")) {
870 static int lp_register(int nr, struct parport *port)
872 lp_table[nr].dev = parport_register_device(port, "lp",
873 lp_preempt, NULL, NULL, 0,
874 (void *) &lp_table[nr]);
875 if (lp_table[nr].dev == NULL)
877 lp_table[nr].flags |= LP_EXIST;
882 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
885 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
886 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
888 #ifdef CONFIG_LP_CONSOLE
890 if (port->modes & PARPORT_MODE_SAFEININT) {
891 register_console(&lpcons);
892 console_registered = port;
893 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
895 printk (KERN_ERR "lp%d: cannot run console on %s\n",
896 CONSOLE_LP, port->name);
903 static void lp_attach (struct parport *port)
907 switch (parport_nr[0]) {
908 case LP_PARPORT_UNSPEC:
909 case LP_PARPORT_AUTO:
910 if (parport_nr[0] == LP_PARPORT_AUTO &&
911 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
913 if (lp_count == LP_NO) {
914 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
917 if (!lp_register(lp_count, port))
922 for (i = 0; i < LP_NO; i++) {
923 if (port->number == parport_nr[i]) {
924 if (!lp_register(i, port))
933 static void lp_detach (struct parport *port)
935 /* Write this some day. */
936 #ifdef CONFIG_LP_CONSOLE
937 if (console_registered == port) {
938 unregister_console(&lpcons);
939 console_registered = NULL;
941 #endif /* CONFIG_LP_CONSOLE */
944 static struct parport_driver lp_driver = {
950 static int __init lp_init (void)
954 if (parport_nr[0] == LP_PARPORT_OFF)
957 for (i = 0; i < LP_NO; i++) {
958 lp_table[i].dev = NULL;
959 lp_table[i].flags = 0;
960 lp_table[i].chars = LP_INIT_CHAR;
961 lp_table[i].time = LP_INIT_TIME;
962 lp_table[i].wait = LP_INIT_WAIT;
963 lp_table[i].lp_buffer = NULL;
965 lp_table[i].lastcall = 0;
966 lp_table[i].runchars = 0;
967 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
969 lp_table[i].last_error = 0;
970 init_waitqueue_head (&lp_table[i].waitq);
971 init_waitqueue_head (&lp_table[i].dataq);
972 mutex_init(&lp_table[i].port_mutex);
973 lp_table[i].timeout = 10 * HZ;
976 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
977 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
981 lp_class = class_create(THIS_MODULE, "printer");
982 if (IS_ERR(lp_class)) {
983 err = PTR_ERR(lp_class);
987 if (parport_register_driver (&lp_driver)) {
988 printk (KERN_ERR "lp: unable to register with parport\n");
994 printk (KERN_INFO "lp: driver loaded but no devices found\n");
995 #ifndef CONFIG_PARPORT_1284
996 if (parport_nr[0] == LP_PARPORT_AUTO)
997 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
1004 class_destroy(lp_class);
1006 unregister_chrdev(LP_MAJOR, "lp");
1010 static int __init lp_init_module (void)
1013 /* The user gave some parameters. Let's see what they were. */
1014 if (!strncmp(parport[0], "auto", 4))
1015 parport_nr[0] = LP_PARPORT_AUTO;
1018 for (n = 0; n < LP_NO && parport[n]; n++) {
1019 if (!strncmp(parport[n], "none", 4))
1020 parport_nr[n] = LP_PARPORT_NONE;
1023 unsigned long r = simple_strtoul(parport[n], &ep, 0);
1024 if (ep != parport[n])
1027 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
1038 static void lp_cleanup_module (void)
1040 unsigned int offset;
1042 parport_unregister_driver (&lp_driver);
1044 #ifdef CONFIG_LP_CONSOLE
1045 unregister_console (&lpcons);
1048 unregister_chrdev(LP_MAJOR, "lp");
1049 for (offset = 0; offset < LP_NO; offset++) {
1050 if (lp_table[offset].dev == NULL)
1052 parport_unregister_device(lp_table[offset].dev);
1053 device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
1055 class_destroy(lp_class);
1058 __setup("lp=", lp_setup);
1059 module_init(lp_init_module);
1060 module_exit(lp_cleanup_module);
1062 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
1063 MODULE_LICENSE("GPL");