Root/drivers/char/lp.c

1/*
2 * Generic parallel printer driver
3 *
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
33 * mode fine).
34 */
35
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
38 * abstraction layer.
39 *
40 * If this driver is built into the kernel, you can configure it using the
41 * kernel command-line. For example:
42 *
43 * lp=parport1,none,parport2 (bind lp0 to parport1, disable lp1 and
44 * bind lp2 to parport2)
45 *
46 * lp=auto (assign lp devices to all ports that
47 * have printers attached, as determined
48 * by the IEEE-1284 autoprobe)
49 *
50 * lp=reset (reset the printer during
51 * initialisation)
52 *
53 * lp=off (disable the printer driver entirely)
54 *
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:
57 *
58 * # insmod lp.o parport=1,none,2
59 *
60 * # insmod lp.o parport=auto
61 *
62 * # insmod lp.o reset=1
63 */
64
65/* COMPATIBILITY WITH OLD KERNELS
66 *
67 * Under Linux 2.0 and previous versions, lp devices were bound to ports at
68 * particular I/O addresses, as follows:
69 *
70 * lp0 0x3bc
71 * lp1 0x378
72 * lp2 0x278
73 *
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.
78 */
79
80/*
81 * The new interrupt handling code take care of the buggy handshake
82 * of some HP and Epson printer:
83 * ___
84 * ACK _______________ ___________
85 * |__|
86 * ____
87 * BUSY _________ _______
88 * |____________|
89 *
90 * I discovered this using the printer scanner that you can find at:
91 *
92 * ftp://e-mind.com/pub/linux/pscan/
93 *
94 * 11 May 98, Andrea Arcangeli
95 *
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
98 * this case fine too.
99 *
100 * 15 Oct 1998, Andrea Arcangeli
101 *
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
107 * month ago...
108 *
109 * 14 Dec 1998, Andrea Arcangeli
110 *
111 * Copyright (C) 2000 by Tim Waugh (added LPSETTIMEOUT ioctl)
112 */
113
114#include <linux/module.h>
115#include <linux/init.h>
116
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>
131
132#include <linux/parport.h>
133#undef LP_STATS
134#include <linux/lp.h>
135
136#include <asm/irq.h>
137#include <asm/uaccess.h>
138
139/* if you have more than 8 printers, remember to increase LP_NO */
140#define LP_NO 8
141
142static DEFINE_MUTEX(lp_mutex);
143static struct lp_struct lp_table[LP_NO];
144
145static unsigned int lp_count = 0;
146static struct class *lp_class;
147
148#ifdef CONFIG_LP_CONSOLE
149static struct parport *console_registered;
150#endif /* CONFIG_LP_CONSOLE */
151
152#undef LP_DEBUG
153
154/* Bits used to manage claiming the parport device */
155#define LP_PREEMPT_REQUEST 1
156#define LP_PARPORT_CLAIMED 2
157
158/* --- low-level port access ----------------------------------- */
159
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)
164
165/* Claim the parport or block trying unless we've already claimed it */
166static void lp_claim_parport_or_block(struct lp_struct *this_lp)
167{
168    if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
169        parport_claim_or_block (this_lp->dev);
170    }
171}
172
173/* Claim the parport or block trying unless we've already claimed it */
174static void lp_release_parport(struct lp_struct *this_lp)
175{
176    if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
177        parport_release (this_lp->dev);
178    }
179}
180
181
182
183static int lp_preempt(void *handle)
184{
185    struct lp_struct *this_lp = (struct lp_struct *)handle;
186    set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
187    return (1);
188}
189
190
191/*
192 * Try to negotiate to a new mode; if unsuccessful negotiate to
193 * compatibility mode. Return the mode we ended up in.
194 */
195static int lp_negotiate(struct parport * port, int mode)
196{
197    if (parport_negotiate (port, mode) != 0) {
198        mode = IEEE1284_MODE_COMPAT;
199        parport_negotiate (port, mode);
200    }
201
202    return (mode);
203}
204
205static int lp_reset(int minor)
206{
207    int retval;
208    lp_claim_parport_or_block (&lp_table[minor]);
209    w_ctr(minor, LP_PSELECP);
210    udelay (LP_DELAY);
211    w_ctr(minor, LP_PSELECP | LP_PINITP);
212    retval = r_str(minor);
213    lp_release_parport (&lp_table[minor]);
214    return retval;
215}
216
217static void lp_error (int minor)
218{
219    DEFINE_WAIT(wait);
220    int polling;
221
222    if (LP_F(minor) & LP_ABORT)
223        return;
224
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);
232}
233
234static int lp_check_status(int minor)
235{
236    int error = 0;
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))
240        /* No error. */
241        last = 0;
242    else if ((status & LP_POUTPA)) {
243        if (last != LP_POUTPA) {
244            last = LP_POUTPA;
245            printk(KERN_INFO "lp%d out of paper\n", minor);
246        }
247        error = -ENOSPC;
248    } else if (!(status & LP_PSELECD)) {
249        if (last != LP_PSELECD) {
250            last = LP_PSELECD;
251            printk(KERN_INFO "lp%d off-line\n", minor);
252        }
253        error = -EIO;
254    } else if (!(status & LP_PERRORP)) {
255        if (last != LP_PERRORP) {
256            last = LP_PERRORP;
257            printk(KERN_INFO "lp%d on fire\n", minor);
258        }
259        error = -EIO;
260    } else {
261        last = 0; /* Come here if LP_CAREFUL is set and no
262                             errors are reported. */
263    }
264
265    lp_table[minor].last_error = last;
266
267    if (last != 0)
268        lp_error(minor);
269
270    return error;
271}
272
273static int lp_wait_ready(int minor, int nonblock)
274{
275    int error = 0;
276
277    /* If we're not in compatibility mode, we're ready now! */
278    if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
279      return (0);
280    }
281
282    do {
283        error = lp_check_status (minor);
284        if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
285            break;
286        if (signal_pending (current)) {
287            error = -EINTR;
288            break;
289        }
290    } while (error);
291    return error;
292}
293
294static ssize_t lp_write(struct file * file, const char __user * buf,
295                size_t count, loff_t *ppos)
296{
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;
300    ssize_t retv = 0;
301    ssize_t written;
302    size_t copy_size = count;
303    int nonblock = ((file->f_flags & O_NONBLOCK) ||
304            (LP_F(minor) & LP_ABORT));
305
306#ifdef LP_STATS
307    if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
308        lp_table[minor].runchars = 0;
309
310    lp_table[minor].lastcall = jiffies;
311#endif
312
313    /* Need to copy the data from user-space. */
314    if (copy_size > LP_BUFFER_SIZE)
315        copy_size = LP_BUFFER_SIZE;
316
317    if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
318        return -EINTR;
319
320    if (copy_from_user (kbuf, buf, copy_size)) {
321        retv = -EFAULT;
322        goto out_unlock;
323    }
324
325     /* Claim Parport or sleep until it becomes available
326      */
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);
331
332    parport_set_timeout (lp_table[minor].dev,
333                 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
334                  : lp_table[minor].timeout));
335
336    if ((retv = lp_wait_ready (minor, nonblock)) == 0)
337    do {
338        /* Write the data. */
339        written = parport_write (port, kbuf, copy_size);
340        if (written > 0) {
341            copy_size -= written;
342            count -= written;
343            buf += written;
344            retv += written;
345        }
346
347        if (signal_pending (current)) {
348            if (retv == 0)
349                retv = -EINTR;
350
351            break;
352        }
353
354        if (copy_size > 0) {
355            /* incomplete write -> check error ! */
356            int error;
357
358            parport_negotiate (lp_table[minor].dev->port,
359                       IEEE1284_MODE_COMPAT);
360            lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
361
362            error = lp_wait_ready (minor, nonblock);
363
364            if (error) {
365                if (retv == 0)
366                    retv = error;
367                break;
368            } else if (nonblock) {
369                if (retv == 0)
370                    retv = -EAGAIN;
371                break;
372            }
373
374            parport_yield_blocking (lp_table[minor].dev);
375            lp_table[minor].current_mode
376              = lp_negotiate (port,
377                      lp_table[minor].best_mode);
378
379        } else if (need_resched())
380            schedule ();
381
382        if (count) {
383            copy_size = count;
384            if (copy_size > LP_BUFFER_SIZE)
385                copy_size = LP_BUFFER_SIZE;
386
387            if (copy_from_user(kbuf, buf, copy_size)) {
388                if (retv == 0)
389                    retv = -EFAULT;
390                break;
391            }
392        }
393    } while (count > 0);
394
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]);
402    }
403out_unlock:
404    mutex_unlock(&lp_table[minor].port_mutex);
405
406     return retv;
407}
408
409#ifdef CONFIG_PARPORT_1284
410
411/* Status readback conforming to ieee1284 */
412static ssize_t lp_read(struct file * file, char __user * buf,
413               size_t count, loff_t *ppos)
414{
415    DEFINE_WAIT(wait);
416    unsigned int minor=iminor(file_inode(file));
417    struct parport *port = lp_table[minor].dev->port;
418    ssize_t retval = 0;
419    char *kbuf = lp_table[minor].lp_buffer;
420    int nonblock = ((file->f_flags & O_NONBLOCK) ||
421            (LP_F(minor) & LP_ABORT));
422
423    if (count > LP_BUFFER_SIZE)
424        count = LP_BUFFER_SIZE;
425
426    if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
427        return -EINTR;
428
429    lp_claim_parport_or_block (&lp_table[minor]);
430
431    parport_set_timeout (lp_table[minor].dev,
432                 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
433                  : lp_table[minor].timeout));
434
435    parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
436    if (parport_negotiate (lp_table[minor].dev->port,
437                   IEEE1284_MODE_NIBBLE)) {
438        retval = -EIO;
439        goto out;
440    }
441
442    while (retval == 0) {
443        retval = parport_read (port, kbuf, count);
444
445        if (retval > 0)
446            break;
447
448        if (nonblock) {
449            retval = -EAGAIN;
450            break;
451        }
452
453        /* Wait for data. */
454
455        if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
456            parport_negotiate (lp_table[minor].dev->port,
457                       IEEE1284_MODE_COMPAT);
458            lp_error (minor);
459            if (parport_negotiate (lp_table[minor].dev->port,
460                           IEEE1284_MODE_NIBBLE)) {
461                retval = -EIO;
462                goto out;
463            }
464        } else {
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);
468        }
469
470        if (signal_pending (current)) {
471            retval = -ERESTARTSYS;
472            break;
473        }
474
475        cond_resched ();
476    }
477    parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
478 out:
479    lp_release_parport (&lp_table[minor]);
480
481    if (retval > 0 && copy_to_user (buf, kbuf, retval))
482        retval = -EFAULT;
483
484    mutex_unlock(&lp_table[minor].port_mutex);
485
486    return retval;
487}
488
489#endif /* IEEE 1284 support */
490
491static int lp_open(struct inode * inode, struct file * file)
492{
493    unsigned int minor = iminor(inode);
494    int ret = 0;
495
496    mutex_lock(&lp_mutex);
497    if (minor >= LP_NO) {
498        ret = -ENXIO;
499        goto out;
500    }
501    if ((LP_F(minor) & LP_EXIST) == 0) {
502        ret = -ENXIO;
503        goto out;
504    }
505    if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) {
506        ret = -EBUSY;
507        goto out;
508    }
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)) {
515        int status;
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;
522            ret = -ENOSPC;
523            goto out;
524        } else if (!(status & LP_PSELECD)) {
525            printk(KERN_INFO "lp%d off-line\n", minor);
526            LP_F(minor) &= ~LP_BUSY;
527            ret = -EIO;
528            goto out;
529        } else if (!(status & LP_PERRORP)) {
530            printk(KERN_ERR "lp%d printer error\n", minor);
531            LP_F(minor) &= ~LP_BUSY;
532            ret = -EIO;
533            goto out;
534        }
535    }
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;
539        ret = -ENOMEM;
540        goto out;
541    }
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;
549    } else {
550        lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
551    }
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;
556out:
557    mutex_unlock(&lp_mutex);
558    return ret;
559}
560
561static int lp_release(struct inode * inode, struct file * file)
562{
563    unsigned int minor = iminor(inode);
564
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;
572    return 0;
573}
574
575static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
576    unsigned long arg, void __user *argp)
577{
578    int status;
579    int retval = 0;
580
581#ifdef LP_DEBUG
582    printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
583#endif
584    if (minor >= LP_NO)
585        return -ENODEV;
586    if ((LP_F(minor) & LP_EXIST) == 0)
587        return -ENODEV;
588    switch ( cmd ) {
589        case LPTIME:
590            LP_TIME(minor) = arg * HZ/100;
591            break;
592        case LPCHAR:
593            LP_CHAR(minor) = arg;
594            break;
595        case LPABORT:
596            if (arg)
597                LP_F(minor) |= LP_ABORT;
598            else
599                LP_F(minor) &= ~LP_ABORT;
600            break;
601        case LPABORTOPEN:
602            if (arg)
603                LP_F(minor) |= LP_ABORTOPEN;
604            else
605                LP_F(minor) &= ~LP_ABORTOPEN;
606            break;
607        case LPCAREFUL:
608            if (arg)
609                LP_F(minor) |= LP_CAREFUL;
610            else
611                LP_F(minor) &= ~LP_CAREFUL;
612            break;
613        case LPWAIT:
614            LP_WAIT(minor) = arg;
615            break;
616        case LPSETIRQ:
617            return -EINVAL;
618            break;
619        case LPGETIRQ:
620            if (copy_to_user(argp, &LP_IRQ(minor),
621                    sizeof(int)))
622                return -EFAULT;
623            break;
624        case LPGETSTATUS:
625            lp_claim_parport_or_block (&lp_table[minor]);
626            status = r_str(minor);
627            lp_release_parport (&lp_table[minor]);
628
629            if (copy_to_user(argp, &status, sizeof(int)))
630                return -EFAULT;
631            break;
632        case LPRESET:
633            lp_reset(minor);
634            break;
635#ifdef LP_STATS
636        case LPGETSTATS:
637            if (copy_to_user(argp, &LP_STAT(minor),
638                    sizeof(struct lp_stats)))
639                return -EFAULT;
640            if (capable(CAP_SYS_ADMIN))
641                memset(&LP_STAT(minor), 0,
642                        sizeof(struct lp_stats));
643            break;
644#endif
645         case LPGETFLAGS:
646             status = LP_F(minor);
647            if (copy_to_user(argp, &status, sizeof(int)))
648                return -EFAULT;
649            break;
650
651        default:
652            retval = -EINVAL;
653    }
654    return retval;
655}
656
657static int lp_set_timeout(unsigned int minor, struct timeval *par_timeout)
658{
659    long to_jiffies;
660
661    /* Convert to jiffies, place in lp_table */
662    if ((par_timeout->tv_sec < 0) ||
663        (par_timeout->tv_usec < 0)) {
664        return -EINVAL;
665    }
666    to_jiffies = DIV_ROUND_UP(par_timeout->tv_usec, 1000000/HZ);
667    to_jiffies += par_timeout->tv_sec * (long) HZ;
668    if (to_jiffies <= 0) {
669        return -EINVAL;
670    }
671    lp_table[minor].timeout = to_jiffies;
672    return 0;
673}
674
675static long lp_ioctl(struct file *file, unsigned int cmd,
676            unsigned long arg)
677{
678    unsigned int minor;
679    struct timeval par_timeout;
680    int ret;
681
682    minor = iminor(file_inode(file));
683    mutex_lock(&lp_mutex);
684    switch (cmd) {
685    case LPSETTIMEOUT:
686        if (copy_from_user(&par_timeout, (void __user *)arg,
687                    sizeof (struct timeval))) {
688            ret = -EFAULT;
689            break;
690        }
691        ret = lp_set_timeout(minor, &par_timeout);
692        break;
693    default:
694        ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
695        break;
696    }
697    mutex_unlock(&lp_mutex);
698
699    return ret;
700}
701
702#ifdef CONFIG_COMPAT
703static long lp_compat_ioctl(struct file *file, unsigned int cmd,
704            unsigned long arg)
705{
706    unsigned int minor;
707    struct timeval par_timeout;
708    int ret;
709
710    minor = iminor(file_inode(file));
711    mutex_lock(&lp_mutex);
712    switch (cmd) {
713    case LPSETTIMEOUT:
714        if (compat_get_timeval(&par_timeout, compat_ptr(arg))) {
715            ret = -EFAULT;
716            break;
717        }
718        ret = lp_set_timeout(minor, &par_timeout);
719        break;
720#ifdef LP_STATS
721    case LPGETSTATS:
722        /* FIXME: add an implementation if you set LP_STATS */
723        ret = -EINVAL;
724        break;
725#endif
726    default:
727        ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
728        break;
729    }
730    mutex_unlock(&lp_mutex);
731
732    return ret;
733}
734#endif
735
736static const struct file_operations lp_fops = {
737    .owner = THIS_MODULE,
738    .write = lp_write,
739    .unlocked_ioctl = lp_ioctl,
740#ifdef CONFIG_COMPAT
741    .compat_ioctl = lp_compat_ioctl,
742#endif
743    .open = lp_open,
744    .release = lp_release,
745#ifdef CONFIG_PARPORT_1284
746    .read = lp_read,
747#endif
748    .llseek = noop_llseek,
749};
750
751/* --- support for console on the line printer ----------------- */
752
753#ifdef CONFIG_LP_CONSOLE
754
755#define CONSOLE_LP 0
756
757/* If the printer is out of paper, we can either lose the messages or
758 * stall until the printer is happy again. Define CONSOLE_LP_STRICT
759 * non-zero to get the latter behaviour. */
760#define CONSOLE_LP_STRICT 1
761
762/* The console must be locked when we get here. */
763
764static void lp_console_write (struct console *co, const char *s,
765                  unsigned count)
766{
767    struct pardevice *dev = lp_table[CONSOLE_LP].dev;
768    struct parport *port = dev->port;
769    ssize_t written;
770
771    if (parport_claim (dev))
772        /* Nothing we can do. */
773        return;
774
775    parport_set_timeout (dev, 0);
776
777    /* Go to compatibility mode. */
778    parport_negotiate (port, IEEE1284_MODE_COMPAT);
779
780    do {
781        /* Write the data, converting LF->CRLF as we go. */
782        ssize_t canwrite = count;
783        char *lf = memchr (s, '\n', count);
784        if (lf)
785            canwrite = lf - s;
786
787        if (canwrite > 0) {
788            written = parport_write (port, s, canwrite);
789
790            if (written <= 0)
791                continue;
792
793            s += written;
794            count -= written;
795            canwrite -= written;
796        }
797
798        if (lf && canwrite <= 0) {
799            const char *crlf = "\r\n";
800            int i = 2;
801
802            /* Dodge the original '\n', and put '\r\n' instead. */
803            s++;
804            count--;
805            do {
806                written = parport_write (port, crlf, i);
807                if (written > 0)
808                    i -= written, crlf += written;
809            } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
810        }
811    } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
812
813    parport_release (dev);
814}
815
816static struct console lpcons = {
817    .name = "lp",
818    .write = lp_console_write,
819    .flags = CON_PRINTBUFFER,
820};
821
822#endif /* console on line printer */
823
824/* --- initialisation code ------------------------------------- */
825
826static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
827static char *parport[LP_NO];
828static bool reset;
829
830module_param_array(parport, charp, NULL, 0);
831module_param(reset, bool, 0);
832
833#ifndef MODULE
834static int __init lp_setup (char *str)
835{
836    static int parport_ptr;
837    int x;
838
839    if (get_option(&str, &x)) {
840        if (x == 0) {
841            /* disable driver on "lp=" or "lp=0" */
842            parport_nr[0] = LP_PARPORT_OFF;
843        } else {
844            printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
845            return 0;
846        }
847    } else if (!strncmp(str, "parport", 7)) {
848        int n = simple_strtoul(str+7, NULL, 10);
849        if (parport_ptr < LP_NO)
850            parport_nr[parport_ptr++] = n;
851        else
852            printk(KERN_INFO "lp: too many ports, %s ignored.\n",
853                   str);
854    } else if (!strcmp(str, "auto")) {
855        parport_nr[0] = LP_PARPORT_AUTO;
856    } else if (!strcmp(str, "none")) {
857        parport_nr[parport_ptr++] = LP_PARPORT_NONE;
858    } else if (!strcmp(str, "reset")) {
859        reset = 1;
860    }
861    return 1;
862}
863#endif
864
865static int lp_register(int nr, struct parport *port)
866{
867    lp_table[nr].dev = parport_register_device(port, "lp",
868                           lp_preempt, NULL, NULL, 0,
869                           (void *) &lp_table[nr]);
870    if (lp_table[nr].dev == NULL)
871        return 1;
872    lp_table[nr].flags |= LP_EXIST;
873
874    if (reset)
875        lp_reset(nr);
876
877    device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
878              "lp%d", nr);
879
880    printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
881           (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
882
883#ifdef CONFIG_LP_CONSOLE
884    if (!nr) {
885        if (port->modes & PARPORT_MODE_SAFEININT) {
886            register_console(&lpcons);
887            console_registered = port;
888            printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
889        } else
890            printk (KERN_ERR "lp%d: cannot run console on %s\n",
891                CONSOLE_LP, port->name);
892    }
893#endif
894
895    return 0;
896}
897
898static void lp_attach (struct parport *port)
899{
900    unsigned int i;
901
902    switch (parport_nr[0]) {
903    case LP_PARPORT_UNSPEC:
904    case LP_PARPORT_AUTO:
905        if (parport_nr[0] == LP_PARPORT_AUTO &&
906            port->probe_info[0].class != PARPORT_CLASS_PRINTER)
907            return;
908        if (lp_count == LP_NO) {
909            printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
910            return;
911        }
912        if (!lp_register(lp_count, port))
913            lp_count++;
914        break;
915
916    default:
917        for (i = 0; i < LP_NO; i++) {
918            if (port->number == parport_nr[i]) {
919                if (!lp_register(i, port))
920                    lp_count++;
921                break;
922            }
923        }
924        break;
925    }
926}
927
928static void lp_detach (struct parport *port)
929{
930    /* Write this some day. */
931#ifdef CONFIG_LP_CONSOLE
932    if (console_registered == port) {
933        unregister_console(&lpcons);
934        console_registered = NULL;
935    }
936#endif /* CONFIG_LP_CONSOLE */
937}
938
939static struct parport_driver lp_driver = {
940    .name = "lp",
941    .attach = lp_attach,
942    .detach = lp_detach,
943};
944
945static int __init lp_init (void)
946{
947    int i, err = 0;
948
949    if (parport_nr[0] == LP_PARPORT_OFF)
950        return 0;
951
952    for (i = 0; i < LP_NO; i++) {
953        lp_table[i].dev = NULL;
954        lp_table[i].flags = 0;
955        lp_table[i].chars = LP_INIT_CHAR;
956        lp_table[i].time = LP_INIT_TIME;
957        lp_table[i].wait = LP_INIT_WAIT;
958        lp_table[i].lp_buffer = NULL;
959#ifdef LP_STATS
960        lp_table[i].lastcall = 0;
961        lp_table[i].runchars = 0;
962        memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
963#endif
964        lp_table[i].last_error = 0;
965        init_waitqueue_head (&lp_table[i].waitq);
966        init_waitqueue_head (&lp_table[i].dataq);
967        mutex_init(&lp_table[i].port_mutex);
968        lp_table[i].timeout = 10 * HZ;
969    }
970
971    if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
972        printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
973        return -EIO;
974    }
975
976    lp_class = class_create(THIS_MODULE, "printer");
977    if (IS_ERR(lp_class)) {
978        err = PTR_ERR(lp_class);
979        goto out_reg;
980    }
981
982    if (parport_register_driver (&lp_driver)) {
983        printk (KERN_ERR "lp: unable to register with parport\n");
984        err = -EIO;
985        goto out_class;
986    }
987
988    if (!lp_count) {
989        printk (KERN_INFO "lp: driver loaded but no devices found\n");
990#ifndef CONFIG_PARPORT_1284
991        if (parport_nr[0] == LP_PARPORT_AUTO)
992            printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
993#endif
994    }
995
996    return 0;
997
998out_class:
999    class_destroy(lp_class);
1000out_reg:
1001    unregister_chrdev(LP_MAJOR, "lp");
1002    return err;
1003}
1004
1005static int __init lp_init_module (void)
1006{
1007    if (parport[0]) {
1008        /* The user gave some parameters. Let's see what they were. */
1009        if (!strncmp(parport[0], "auto", 4))
1010            parport_nr[0] = LP_PARPORT_AUTO;
1011        else {
1012            int n;
1013            for (n = 0; n < LP_NO && parport[n]; n++) {
1014                if (!strncmp(parport[n], "none", 4))
1015                    parport_nr[n] = LP_PARPORT_NONE;
1016                else {
1017                    char *ep;
1018                    unsigned long r = simple_strtoul(parport[n], &ep, 0);
1019                    if (ep != parport[n])
1020                        parport_nr[n] = r;
1021                    else {
1022                        printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
1023                        return -ENODEV;
1024                    }
1025                }
1026            }
1027        }
1028    }
1029
1030    return lp_init();
1031}
1032
1033static void lp_cleanup_module (void)
1034{
1035    unsigned int offset;
1036
1037    parport_unregister_driver (&lp_driver);
1038
1039#ifdef CONFIG_LP_CONSOLE
1040    unregister_console (&lpcons);
1041#endif
1042
1043    unregister_chrdev(LP_MAJOR, "lp");
1044    for (offset = 0; offset < LP_NO; offset++) {
1045        if (lp_table[offset].dev == NULL)
1046            continue;
1047        parport_unregister_device(lp_table[offset].dev);
1048        device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
1049    }
1050    class_destroy(lp_class);
1051}
1052
1053__setup("lp=", lp_setup);
1054module_init(lp_init_module);
1055module_exit(lp_cleanup_module);
1056
1057MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
1058MODULE_LICENSE("GPL");
1059

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