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)
13 * lp_read (Status readback) support added by Carsten Gross,
16 * Parport sharing hacking by Andrea Arcangeli
17 * Fixed kernel_(to/from)_user memory copy to check for errors
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/signal.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 <linux/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];
144 static int port_num[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;
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;
228 lp_release_parport(&lp_table[minor]);
229 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
230 schedule_timeout(LP_TIMEOUT_POLLED);
231 finish_wait(&lp_table[minor].waitq, &wait);
233 lp_claim_parport_or_block(&lp_table[minor]);
235 parport_yield_blocking(lp_table[minor].dev);
238 static int lp_check_status(int minor)
241 unsigned int last = lp_table[minor].last_error;
242 unsigned char status = r_str(minor);
243 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
246 else if ((status & LP_POUTPA)) {
247 if (last != LP_POUTPA) {
249 printk(KERN_INFO "lp%d out of paper\n", minor);
252 } else if (!(status & LP_PSELECD)) {
253 if (last != LP_PSELECD) {
255 printk(KERN_INFO "lp%d off-line\n", minor);
258 } else if (!(status & LP_PERRORP)) {
259 if (last != LP_PERRORP) {
261 printk(KERN_INFO "lp%d on fire\n", minor);
265 last = 0; /* Come here if LP_CAREFUL is set and no
266 errors are reported. */
269 lp_table[minor].last_error = last;
277 static int lp_wait_ready(int minor, int nonblock)
281 /* If we're not in compatibility mode, we're ready now! */
282 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
287 error = lp_check_status(minor);
288 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
290 if (signal_pending(current)) {
298 static ssize_t lp_write(struct file *file, const char __user *buf,
299 size_t count, loff_t *ppos)
301 unsigned int minor = iminor(file_inode(file));
302 struct parport *port = lp_table[minor].dev->port;
303 char *kbuf = lp_table[minor].lp_buffer;
306 size_t copy_size = count;
307 int nonblock = ((file->f_flags & O_NONBLOCK) ||
308 (LP_F(minor) & LP_ABORT));
311 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
312 lp_table[minor].runchars = 0;
314 lp_table[minor].lastcall = jiffies;
317 /* Need to copy the data from user-space. */
318 if (copy_size > LP_BUFFER_SIZE)
319 copy_size = LP_BUFFER_SIZE;
321 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
324 if (copy_from_user(kbuf, buf, copy_size)) {
329 /* Claim Parport or sleep until it becomes available
331 lp_claim_parport_or_block(&lp_table[minor]);
332 /* Go to the proper mode. */
333 lp_table[minor].current_mode = lp_negotiate(port,
334 lp_table[minor].best_mode);
336 parport_set_timeout(lp_table[minor].dev,
337 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
338 : lp_table[minor].timeout));
340 if ((retv = lp_wait_ready(minor, nonblock)) == 0)
342 /* Write the data. */
343 written = parport_write(port, kbuf, copy_size);
345 copy_size -= written;
351 if (signal_pending(current)) {
359 /* incomplete write -> check error ! */
362 parport_negotiate(lp_table[minor].dev->port,
363 IEEE1284_MODE_COMPAT);
364 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
366 error = lp_wait_ready(minor, nonblock);
372 } else if (nonblock) {
378 parport_yield_blocking(lp_table[minor].dev);
379 lp_table[minor].current_mode
381 lp_table[minor].best_mode);
383 } else if (need_resched())
388 if (copy_size > LP_BUFFER_SIZE)
389 copy_size = LP_BUFFER_SIZE;
391 if (copy_from_user(kbuf, buf, copy_size)) {
399 if (test_and_clear_bit(LP_PREEMPT_REQUEST,
400 &lp_table[minor].bits)) {
401 printk(KERN_INFO "lp%d releasing parport\n", minor);
402 parport_negotiate(lp_table[minor].dev->port,
403 IEEE1284_MODE_COMPAT);
404 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
405 lp_release_parport(&lp_table[minor]);
408 mutex_unlock(&lp_table[minor].port_mutex);
413 #ifdef CONFIG_PARPORT_1284
415 /* Status readback conforming to ieee1284 */
416 static ssize_t lp_read(struct file *file, char __user *buf,
417 size_t count, loff_t *ppos)
420 unsigned int minor=iminor(file_inode(file));
421 struct parport *port = lp_table[minor].dev->port;
423 char *kbuf = lp_table[minor].lp_buffer;
424 int nonblock = ((file->f_flags & O_NONBLOCK) ||
425 (LP_F(minor) & LP_ABORT));
427 if (count > LP_BUFFER_SIZE)
428 count = LP_BUFFER_SIZE;
430 if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
433 lp_claim_parport_or_block(&lp_table[minor]);
435 parport_set_timeout(lp_table[minor].dev,
436 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
437 : lp_table[minor].timeout));
439 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
440 if (parport_negotiate(lp_table[minor].dev->port,
441 IEEE1284_MODE_NIBBLE)) {
446 while (retval == 0) {
447 retval = parport_read(port, kbuf, count);
459 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
460 parport_negotiate(lp_table[minor].dev->port,
461 IEEE1284_MODE_COMPAT);
463 if (parport_negotiate(lp_table[minor].dev->port,
464 IEEE1284_MODE_NIBBLE)) {
469 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
470 schedule_timeout(LP_TIMEOUT_POLLED);
471 finish_wait(&lp_table[minor].waitq, &wait);
474 if (signal_pending(current)) {
475 retval = -ERESTARTSYS;
481 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
483 lp_release_parport(&lp_table[minor]);
485 if (retval > 0 && copy_to_user(buf, kbuf, retval))
488 mutex_unlock(&lp_table[minor].port_mutex);
493 #endif /* IEEE 1284 support */
495 static int lp_open(struct inode *inode, struct file *file)
497 unsigned int minor = iminor(inode);
500 mutex_lock(&lp_mutex);
501 if (minor >= LP_NO) {
505 if ((LP_F(minor) & LP_EXIST) == 0) {
509 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) {
513 /* If ABORTOPEN is set and the printer is offline or out of paper,
514 we may still want to open it to perform ioctl()s. Therefore we
515 have commandeered O_NONBLOCK, even though it is being used in
516 a non-standard manner. This is strictly a Linux hack, and
517 should most likely only ever be used by the tunelp application. */
518 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
520 lp_claim_parport_or_block(&lp_table[minor]);
521 status = r_str(minor);
522 lp_release_parport(&lp_table[minor]);
523 if (status & LP_POUTPA) {
524 printk(KERN_INFO "lp%d out of paper\n", minor);
525 LP_F(minor) &= ~LP_BUSY;
528 } else if (!(status & LP_PSELECD)) {
529 printk(KERN_INFO "lp%d off-line\n", minor);
530 LP_F(minor) &= ~LP_BUSY;
533 } else if (!(status & LP_PERRORP)) {
534 printk(KERN_ERR "lp%d printer error\n", minor);
535 LP_F(minor) &= ~LP_BUSY;
540 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
541 if (!lp_table[minor].lp_buffer) {
542 LP_F(minor) &= ~LP_BUSY;
546 /* Determine if the peripheral supports ECP mode */
547 lp_claim_parport_or_block(&lp_table[minor]);
548 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
549 !parport_negotiate(lp_table[minor].dev->port,
550 IEEE1284_MODE_ECP)) {
551 printk(KERN_INFO "lp%d: ECP mode\n", minor);
552 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
554 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
556 /* Leave peripheral in compatibility mode */
557 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
558 lp_release_parport(&lp_table[minor]);
559 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
561 mutex_unlock(&lp_mutex);
565 static int lp_release(struct inode *inode, struct file *file)
567 unsigned int minor = iminor(inode);
569 lp_claim_parport_or_block(&lp_table[minor]);
570 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
571 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
572 lp_release_parport(&lp_table[minor]);
573 kfree(lp_table[minor].lp_buffer);
574 lp_table[minor].lp_buffer = NULL;
575 LP_F(minor) &= ~LP_BUSY;
579 static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
580 unsigned long arg, void __user *argp)
586 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
590 if ((LP_F(minor) & LP_EXIST) == 0)
594 if (arg > UINT_MAX / HZ)
596 LP_TIME(minor) = arg * HZ/100;
599 LP_CHAR(minor) = arg;
603 LP_F(minor) |= LP_ABORT;
605 LP_F(minor) &= ~LP_ABORT;
609 LP_F(minor) |= LP_ABORTOPEN;
611 LP_F(minor) &= ~LP_ABORTOPEN;
615 LP_F(minor) |= LP_CAREFUL;
617 LP_F(minor) &= ~LP_CAREFUL;
620 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 return lp_set_timeout(minor, karg[0], karg[1]);
718 static long lp_ioctl(struct file *file, unsigned int cmd,
724 minor = iminor(file_inode(file));
725 mutex_lock(&lp_mutex);
727 case LPSETTIMEOUT_OLD:
728 if (BITS_PER_LONG == 32) {
729 ret = lp_set_timeout32(minor, (void __user *)arg);
732 /* fallthrough for 64-bit */
733 case LPSETTIMEOUT_NEW:
734 ret = lp_set_timeout64(minor, (void __user *)arg);
737 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
740 mutex_unlock(&lp_mutex);
746 static long lp_compat_ioctl(struct file *file, unsigned int cmd,
752 minor = iminor(file_inode(file));
753 mutex_lock(&lp_mutex);
755 case LPSETTIMEOUT_OLD:
756 if (!COMPAT_USE_64BIT_TIME) {
757 ret = lp_set_timeout32(minor, (void __user *)arg);
760 /* fallthrough for x32 mode */
761 case LPSETTIMEOUT_NEW:
762 ret = lp_set_timeout64(minor, (void __user *)arg);
766 /* FIXME: add an implementation if you set LP_STATS */
771 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
774 mutex_unlock(&lp_mutex);
780 static const struct file_operations lp_fops = {
781 .owner = THIS_MODULE,
783 .unlocked_ioctl = lp_ioctl,
785 .compat_ioctl = lp_compat_ioctl,
788 .release = lp_release,
789 #ifdef CONFIG_PARPORT_1284
792 .llseek = noop_llseek,
795 /* --- support for console on the line printer ----------------- */
797 #ifdef CONFIG_LP_CONSOLE
801 /* If the printer is out of paper, we can either lose the messages or
802 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
803 * non-zero to get the latter behaviour. */
804 #define CONSOLE_LP_STRICT 1
806 /* The console must be locked when we get here. */
808 static void lp_console_write(struct console *co, const char *s,
811 struct pardevice *dev = lp_table[CONSOLE_LP].dev;
812 struct parport *port = dev->port;
815 if (parport_claim(dev))
816 /* Nothing we can do. */
819 parport_set_timeout(dev, 0);
821 /* Go to compatibility mode. */
822 parport_negotiate(port, IEEE1284_MODE_COMPAT);
825 /* Write the data, converting LF->CRLF as we go. */
826 ssize_t canwrite = count;
827 char *lf = memchr(s, '\n', count);
832 written = parport_write(port, s, canwrite);
842 if (lf && canwrite <= 0) {
843 const char *crlf = "\r\n";
846 /* Dodge the original '\n', and put '\r\n' instead. */
850 written = parport_write(port, crlf, i);
852 i -= written, crlf += written;
853 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
855 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
857 parport_release(dev);
860 static struct console lpcons = {
862 .write = lp_console_write,
863 .flags = CON_PRINTBUFFER,
866 #endif /* console on line printer */
868 /* --- initialisation code ------------------------------------- */
870 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
871 static char *parport[LP_NO];
874 module_param_array(parport, charp, NULL, 0);
875 module_param(reset, bool, 0);
878 static int __init lp_setup(char *str)
880 static int parport_ptr;
883 if (get_option(&str, &x)) {
885 /* disable driver on "lp=" or "lp=0" */
886 parport_nr[0] = LP_PARPORT_OFF;
888 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
891 } else if (!strncmp(str, "parport", 7)) {
892 int n = simple_strtoul(str+7, NULL, 10);
893 if (parport_ptr < LP_NO)
894 parport_nr[parport_ptr++] = n;
896 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
898 } else if (!strcmp(str, "auto")) {
899 parport_nr[0] = LP_PARPORT_AUTO;
900 } else if (!strcmp(str, "none")) {
901 if (parport_ptr < LP_NO)
902 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
904 printk(KERN_INFO "lp: too many ports, %s ignored.\n",
906 } else if (!strcmp(str, "reset")) {
913 static int lp_register(int nr, struct parport *port)
915 struct pardev_cb ppdev_cb;
917 memset(&ppdev_cb, 0, sizeof(ppdev_cb));
918 ppdev_cb.preempt = lp_preempt;
919 ppdev_cb.private = &lp_table[nr];
920 lp_table[nr].dev = parport_register_dev_model(port, "lp",
922 if (lp_table[nr].dev == NULL)
924 lp_table[nr].flags |= LP_EXIST;
929 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
932 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
933 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
935 #ifdef CONFIG_LP_CONSOLE
937 if (port->modes & PARPORT_MODE_SAFEININT) {
938 register_console(&lpcons);
939 console_registered = port;
940 printk(KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
942 printk(KERN_ERR "lp%d: cannot run console on %s\n",
943 CONSOLE_LP, port->name);
946 port_num[nr] = port->number;
951 static void lp_attach(struct parport *port)
955 switch (parport_nr[0]) {
956 case LP_PARPORT_UNSPEC:
957 case LP_PARPORT_AUTO:
958 if (parport_nr[0] == LP_PARPORT_AUTO &&
959 port->probe_info[0].class != PARPORT_CLASS_PRINTER)
961 if (lp_count == LP_NO) {
962 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
965 for (i = 0; i < LP_NO; i++)
966 if (port_num[i] == -1)
969 if (!lp_register(i, port))
974 for (i = 0; i < LP_NO; i++) {
975 if (port->number == parport_nr[i]) {
976 if (!lp_register(i, port))
985 static void lp_detach(struct parport *port)
989 /* Write this some day. */
990 #ifdef CONFIG_LP_CONSOLE
991 if (console_registered == port) {
992 unregister_console(&lpcons);
993 console_registered = NULL;
995 #endif /* CONFIG_LP_CONSOLE */
997 for (n = 0; n < LP_NO; n++) {
998 if (port_num[n] == port->number) {
1001 device_destroy(lp_class, MKDEV(LP_MAJOR, n));
1002 parport_unregister_device(lp_table[n].dev);
1007 static struct parport_driver lp_driver = {
1009 .match_port = lp_attach,
1010 .detach = lp_detach,
1014 static int __init lp_init(void)
1018 if (parport_nr[0] == LP_PARPORT_OFF)
1021 for (i = 0; i < LP_NO; i++) {
1022 lp_table[i].dev = NULL;
1023 lp_table[i].flags = 0;
1024 lp_table[i].chars = LP_INIT_CHAR;
1025 lp_table[i].time = LP_INIT_TIME;
1026 lp_table[i].wait = LP_INIT_WAIT;
1027 lp_table[i].lp_buffer = NULL;
1029 lp_table[i].lastcall = 0;
1030 lp_table[i].runchars = 0;
1031 memset(&lp_table[i].stats, 0, sizeof(struct lp_stats));
1033 lp_table[i].last_error = 0;
1034 init_waitqueue_head(&lp_table[i].waitq);
1035 init_waitqueue_head(&lp_table[i].dataq);
1036 mutex_init(&lp_table[i].port_mutex);
1037 lp_table[i].timeout = 10 * HZ;
1041 if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) {
1042 printk(KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
1046 lp_class = class_create(THIS_MODULE, "printer");
1047 if (IS_ERR(lp_class)) {
1048 err = PTR_ERR(lp_class);
1052 if (parport_register_driver(&lp_driver)) {
1053 printk(KERN_ERR "lp: unable to register with parport\n");
1059 printk(KERN_INFO "lp: driver loaded but no devices found\n");
1060 #ifndef CONFIG_PARPORT_1284
1061 if (parport_nr[0] == LP_PARPORT_AUTO)
1062 printk(KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
1069 class_destroy(lp_class);
1071 unregister_chrdev(LP_MAJOR, "lp");
1075 static int __init lp_init_module(void)
1078 /* The user gave some parameters. Let's see what they were. */
1079 if (!strncmp(parport[0], "auto", 4))
1080 parport_nr[0] = LP_PARPORT_AUTO;
1083 for (n = 0; n < LP_NO && parport[n]; n++) {
1084 if (!strncmp(parport[n], "none", 4))
1085 parport_nr[n] = LP_PARPORT_NONE;
1088 unsigned long r = simple_strtoul(parport[n], &ep, 0);
1089 if (ep != parport[n])
1092 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
1103 static void lp_cleanup_module(void)
1105 parport_unregister_driver(&lp_driver);
1107 #ifdef CONFIG_LP_CONSOLE
1108 unregister_console(&lpcons);
1111 unregister_chrdev(LP_MAJOR, "lp");
1112 class_destroy(lp_class);
1115 __setup("lp=", lp_setup);
1116 module_init(lp_init_module);
1117 module_exit(lp_cleanup_module);
1119 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
1120 MODULE_LICENSE("GPL");