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>
138
#include <asm/system.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];
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;
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 (mutex_lock_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
mutex_unlock(&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 (mutex_lock_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
mutex_unlock(&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);
497
mutex_lock(&lp_mutex);
498
if (minor >= LP_NO) {
502
if ((LP_F(minor) & LP_EXIST) == 0) {
506
if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) {
510
/* If ABORTOPEN is set and the printer is offline or out of paper,
511
we may still want to open it to perform ioctl()s. Therefore we
512
have commandeered O_NONBLOCK, even though it is being used in
513
a non-standard manner. This is strictly a Linux hack, and
514
should most likely only ever be used by the tunelp application. */
515
if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
517
lp_claim_parport_or_block (&lp_table[minor]);
518
status = r_str(minor);
519
lp_release_parport (&lp_table[minor]);
520
if (status & LP_POUTPA) {
521
printk(KERN_INFO "lp%d out of paper\n", minor);
522
LP_F(minor) &= ~LP_BUSY;
525
} else if (!(status & LP_PSELECD)) {
526
printk(KERN_INFO "lp%d off-line\n", minor);
527
LP_F(minor) &= ~LP_BUSY;
530
} else if (!(status & LP_PERRORP)) {
531
printk(KERN_ERR "lp%d printer error\n", minor);
532
LP_F(minor) &= ~LP_BUSY;
537
lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
538
if (!lp_table[minor].lp_buffer) {
539
LP_F(minor) &= ~LP_BUSY;
543
/* Determine if the peripheral supports ECP mode */
544
lp_claim_parport_or_block (&lp_table[minor]);
545
if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
546
!parport_negotiate (lp_table[minor].dev->port,
547
IEEE1284_MODE_ECP)) {
548
printk (KERN_INFO "lp%d: ECP mode\n", minor);
549
lp_table[minor].best_mode = IEEE1284_MODE_ECP;
551
lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
553
/* Leave peripheral in compatibility mode */
554
parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
555
lp_release_parport (&lp_table[minor]);
556
lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
558
mutex_unlock(&lp_mutex);
562
static int lp_release(struct inode * inode, struct file * file)
564
unsigned int minor = iminor(inode);
566
lp_claim_parport_or_block (&lp_table[minor]);
567
parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
568
lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
569
lp_release_parport (&lp_table[minor]);
570
kfree(lp_table[minor].lp_buffer);
571
lp_table[minor].lp_buffer = NULL;
572
LP_F(minor) &= ~LP_BUSY;
576
static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
577
unsigned long arg, void __user *argp)
583
printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
587
if ((LP_F(minor) & LP_EXIST) == 0)
591
LP_TIME(minor) = arg * HZ/100;
594
LP_CHAR(minor) = arg;
598
LP_F(minor) |= LP_ABORT;
600
LP_F(minor) &= ~LP_ABORT;
604
LP_F(minor) |= LP_ABORTOPEN;
606
LP_F(minor) &= ~LP_ABORTOPEN;
610
LP_F(minor) |= LP_CAREFUL;
612
LP_F(minor) &= ~LP_CAREFUL;
615
LP_WAIT(minor) = arg;
621
if (copy_to_user(argp, &LP_IRQ(minor),
626
lp_claim_parport_or_block (&lp_table[minor]);
627
status = r_str(minor);
628
lp_release_parport (&lp_table[minor]);
630
if (copy_to_user(argp, &status, sizeof(int)))
638
if (copy_to_user(argp, &LP_STAT(minor),
639
sizeof(struct lp_stats)))
641
if (capable(CAP_SYS_ADMIN))
642
memset(&LP_STAT(minor), 0,
643
sizeof(struct lp_stats));
647
status = LP_F(minor);
648
if (copy_to_user(argp, &status, sizeof(int)))
658
static int lp_set_timeout(unsigned int minor, struct timeval *par_timeout)
662
/* Convert to jiffies, place in lp_table */
663
if ((par_timeout->tv_sec < 0) ||
664
(par_timeout->tv_usec < 0)) {
667
to_jiffies = DIV_ROUND_UP(par_timeout->tv_usec, 1000000/HZ);
668
to_jiffies += par_timeout->tv_sec * (long) HZ;
669
if (to_jiffies <= 0) {
672
lp_table[minor].timeout = to_jiffies;
676
static long lp_ioctl(struct file *file, unsigned int cmd,
680
struct timeval par_timeout;
683
minor = iminor(file->f_path.dentry->d_inode);
684
mutex_lock(&lp_mutex);
687
if (copy_from_user(&par_timeout, (void __user *)arg,
688
sizeof (struct timeval))) {
692
ret = lp_set_timeout(minor, &par_timeout);
695
ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
698
mutex_unlock(&lp_mutex);
704
static long lp_compat_ioctl(struct file *file, unsigned int cmd,
708
struct timeval par_timeout;
709
struct compat_timeval __user *tc;
712
minor = iminor(file->f_path.dentry->d_inode);
713
mutex_lock(&lp_mutex);
716
tc = compat_ptr(arg);
717
if (get_user(par_timeout.tv_sec, &tc->tv_sec) ||
718
get_user(par_timeout.tv_usec, &tc->tv_usec)) {
722
ret = lp_set_timeout(minor, &par_timeout);
726
/* FIXME: add an implementation if you set LP_STATS */
731
ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
734
mutex_unlock(&lp_mutex);
740
static const struct file_operations lp_fops = {
741
.owner = THIS_MODULE,
743
.unlocked_ioctl = lp_ioctl,
745
.compat_ioctl = lp_compat_ioctl,
748
.release = lp_release,
749
#ifdef CONFIG_PARPORT_1284
752
.llseek = noop_llseek,
755
/* --- support for console on the line printer ----------------- */
757
#ifdef CONFIG_LP_CONSOLE
761
/* If the printer is out of paper, we can either lose the messages or
762
* stall until the printer is happy again. Define CONSOLE_LP_STRICT
763
* non-zero to get the latter behaviour. */
764
#define CONSOLE_LP_STRICT 1
766
/* The console must be locked when we get here. */
768
static void lp_console_write (struct console *co, const char *s,
771
struct pardevice *dev = lp_table[CONSOLE_LP].dev;
772
struct parport *port = dev->port;
775
if (parport_claim (dev))
776
/* Nothing we can do. */
779
parport_set_timeout (dev, 0);
781
/* Go to compatibility mode. */
782
parport_negotiate (port, IEEE1284_MODE_COMPAT);
785
/* Write the data, converting LF->CRLF as we go. */
786
ssize_t canwrite = count;
787
char *lf = memchr (s, '\n', count);
792
written = parport_write (port, s, canwrite);
802
if (lf && canwrite <= 0) {
803
const char *crlf = "\r\n";
806
/* Dodge the original '\n', and put '\r\n' instead. */
810
written = parport_write (port, crlf, i);
812
i -= written, crlf += written;
813
} while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
815
} while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
817
parport_release (dev);
820
static struct console lpcons = {
822
.write = lp_console_write,
823
.flags = CON_PRINTBUFFER,
826
#endif /* console on line printer */
828
/* --- initialisation code ------------------------------------- */
830
static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
831
static char *parport[LP_NO];
834
module_param_array(parport, charp, NULL, 0);
835
module_param(reset, bool, 0);
838
static int __init lp_setup (char *str)
840
static int parport_ptr;
843
if (get_option(&str, &x)) {
845
/* disable driver on "lp=" or "lp=0" */
846
parport_nr[0] = LP_PARPORT_OFF;
848
printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
851
} else if (!strncmp(str, "parport", 7)) {
852
int n = simple_strtoul(str+7, NULL, 10);
853
if (parport_ptr < LP_NO)
854
parport_nr[parport_ptr++] = n;
856
printk(KERN_INFO "lp: too many ports, %s ignored.\n",
858
} else if (!strcmp(str, "auto")) {
859
parport_nr[0] = LP_PARPORT_AUTO;
860
} else if (!strcmp(str, "none")) {
861
parport_nr[parport_ptr++] = LP_PARPORT_NONE;
862
} else if (!strcmp(str, "reset")) {
869
static int lp_register(int nr, struct parport *port)
871
lp_table[nr].dev = parport_register_device(port, "lp",
872
lp_preempt, NULL, NULL, 0,
873
(void *) &lp_table[nr]);
874
if (lp_table[nr].dev == NULL)
876
lp_table[nr].flags |= LP_EXIST;
881
device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
884
printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
885
(port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
887
#ifdef CONFIG_LP_CONSOLE
889
if (port->modes & PARPORT_MODE_SAFEININT) {
890
register_console(&lpcons);
891
console_registered = port;
892
printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
894
printk (KERN_ERR "lp%d: cannot run console on %s\n",
895
CONSOLE_LP, port->name);
902
static void lp_attach (struct parport *port)
906
switch (parport_nr[0]) {
907
case LP_PARPORT_UNSPEC:
908
case LP_PARPORT_AUTO:
909
if (parport_nr[0] == LP_PARPORT_AUTO &&
910
port->probe_info[0].class != PARPORT_CLASS_PRINTER)
912
if (lp_count == LP_NO) {
913
printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
916
if (!lp_register(lp_count, port))
921
for (i = 0; i < LP_NO; i++) {
922
if (port->number == parport_nr[i]) {
923
if (!lp_register(i, port))
932
static void lp_detach (struct parport *port)
934
/* Write this some day. */
935
#ifdef CONFIG_LP_CONSOLE
936
if (console_registered == port) {
937
unregister_console(&lpcons);
938
console_registered = NULL;
940
#endif /* CONFIG_LP_CONSOLE */
943
static struct parport_driver lp_driver = {
949
static int __init lp_init (void)
953
if (parport_nr[0] == LP_PARPORT_OFF)
956
for (i = 0; i < LP_NO; i++) {
957
lp_table[i].dev = NULL;
958
lp_table[i].flags = 0;
959
lp_table[i].chars = LP_INIT_CHAR;
960
lp_table[i].time = LP_INIT_TIME;
961
lp_table[i].wait = LP_INIT_WAIT;
962
lp_table[i].lp_buffer = NULL;
964
lp_table[i].lastcall = 0;
965
lp_table[i].runchars = 0;
966
memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
968
lp_table[i].last_error = 0;
969
init_waitqueue_head (&lp_table[i].waitq);
970
init_waitqueue_head (&lp_table[i].dataq);
971
mutex_init(&lp_table[i].port_mutex);
972
lp_table[i].timeout = 10 * HZ;
975
if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
976
printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
980
lp_class = class_create(THIS_MODULE, "printer");
981
if (IS_ERR(lp_class)) {
982
err = PTR_ERR(lp_class);
986
if (parport_register_driver (&lp_driver)) {
987
printk (KERN_ERR "lp: unable to register with parport\n");
993
printk (KERN_INFO "lp: driver loaded but no devices found\n");
994
#ifndef CONFIG_PARPORT_1284
995
if (parport_nr[0] == LP_PARPORT_AUTO)
996
printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
1003
class_destroy(lp_class);
1005
unregister_chrdev(LP_MAJOR, "lp");
1009
static int __init lp_init_module (void)
1012
/* The user gave some parameters. Let's see what they were. */
1013
if (!strncmp(parport[0], "auto", 4))
1014
parport_nr[0] = LP_PARPORT_AUTO;
1017
for (n = 0; n < LP_NO && parport[n]; n++) {
1018
if (!strncmp(parport[n], "none", 4))
1019
parport_nr[n] = LP_PARPORT_NONE;
1022
unsigned long r = simple_strtoul(parport[n], &ep, 0);
1023
if (ep != parport[n])
1026
printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
1037
static void lp_cleanup_module (void)
1039
unsigned int offset;
1041
parport_unregister_driver (&lp_driver);
1043
#ifdef CONFIG_LP_CONSOLE
1044
unregister_console (&lpcons);
1047
unregister_chrdev(LP_MAJOR, "lp");
1048
for (offset = 0; offset < LP_NO; offset++) {
1049
if (lp_table[offset].dev == NULL)
1051
parport_unregister_device(lp_table[offset].dev);
1052
device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
1054
class_destroy(lp_class);
1057
__setup("lp=", lp_setup);
1058
module_init(lp_init_module);
1059
module_exit(lp_cleanup_module);
1061
MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
1062
MODULE_LICENSE("GPL");