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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * linux/drivers/char/ppdev.c
4 *
5 * This is the code behind /dev/parport* -- it allows a user-space
6 * application to use the parport subsystem.
7 *
8 * Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net>
9 *
10 * A /dev/parportx device node represents an arbitrary device
11 * on port 'x'. The following operations are possible:
12 *
13 * open do nothing, set up default IEEE 1284 protocol to be COMPAT
14 * close release port and unregister device (if necessary)
15 * ioctl
16 * EXCL register device exclusively (may fail)
17 * CLAIM (register device first time) parport_claim_or_block
18 * RELEASE parport_release
19 * SETMODE set the IEEE 1284 protocol to use for read/write
20 * SETPHASE set the IEEE 1284 phase of a particular mode. Not to be
21 * confused with ioctl(fd, SETPHASER, &stun). ;-)
22 * DATADIR data_forward / data_reverse
23 * WDATA write_data
24 * RDATA read_data
25 * WCONTROL write_control
26 * RCONTROL read_control
27 * FCONTROL frob_control
28 * RSTATUS read_status
29 * NEGOT parport_negotiate
30 * YIELD parport_yield_blocking
31 * WCTLONIRQ on interrupt, set control lines
32 * CLRIRQ clear (and return) interrupt count
33 * SETTIME sets device timeout (struct timeval)
34 * GETTIME gets device timeout (struct timeval)
35 * GETMODES gets hardware supported modes (unsigned int)
36 * GETMODE gets the current IEEE1284 mode
37 * GETPHASE gets the current IEEE1284 phase
38 * GETFLAGS gets current (user-visible) flags
39 * SETFLAGS sets current (user-visible) flags
40 * read/write read or write in current IEEE 1284 protocol
41 * select wait for interrupt (in readfds)
42 *
43 * Changes:
44 * Added SETTIME/GETTIME ioctl, Fred Barnes, 1999.
45 *
46 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 2000/08/25
47 * - On error, copy_from_user and copy_to_user do not return -EFAULT,
48 * They return the positive number of bytes *not* copied due to address
49 * space errors.
50 *
51 * Added GETMODES/GETMODE/GETPHASE ioctls, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001.
52 * Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001
53 */
54
55#include <linux/module.h>
56#include <linux/init.h>
57#include <linux/sched/signal.h>
58#include <linux/device.h>
59#include <linux/ioctl.h>
60#include <linux/parport.h>
61#include <linux/ctype.h>
62#include <linux/poll.h>
63#include <linux/slab.h>
64#include <linux/major.h>
65#include <linux/ppdev.h>
66#include <linux/mutex.h>
67#include <linux/uaccess.h>
68#include <linux/compat.h>
69
70#define PP_VERSION "ppdev: user-space parallel port driver"
71#define CHRDEV "ppdev"
72
73struct pp_struct {
74 struct pardevice *pdev;
75 wait_queue_head_t irq_wait;
76 atomic_t irqc;
77 unsigned int flags;
78 int irqresponse;
79 unsigned char irqctl;
80 struct ieee1284_info state;
81 struct ieee1284_info saved_state;
82 long default_inactivity;
83 int index;
84};
85
86/* should we use PARDEVICE_MAX here? */
87static struct device *devices[PARPORT_MAX];
88
89static DEFINE_IDA(ida_index);
90
91/* pp_struct.flags bitfields */
92#define PP_CLAIMED (1<<0)
93#define PP_EXCL (1<<1)
94
95/* Other constants */
96#define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */
97#define PP_BUFFER_SIZE 1024
98#define PARDEVICE_MAX 8
99
100static DEFINE_MUTEX(pp_do_mutex);
101
102/* define fixed sized ioctl cmd for y2038 migration */
103#define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2])
104#define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2])
105#define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2])
106#define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2])
107
108static inline void pp_enable_irq(struct pp_struct *pp)
109{
110 struct parport *port = pp->pdev->port;
111
112 port->ops->enable_irq(port);
113}
114
115static ssize_t pp_read(struct file *file, char __user *buf, size_t count,
116 loff_t *ppos)
117{
118 unsigned int minor = iminor(file_inode(file));
119 struct pp_struct *pp = file->private_data;
120 char *kbuffer;
121 ssize_t bytes_read = 0;
122 struct parport *pport;
123 int mode;
124
125 if (!(pp->flags & PP_CLAIMED)) {
126 /* Don't have the port claimed */
127 pr_debug(CHRDEV "%x: claim the port first\n", minor);
128 return -EINVAL;
129 }
130
131 /* Trivial case. */
132 if (count == 0)
133 return 0;
134
135 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
136 if (!kbuffer)
137 return -ENOMEM;
138 pport = pp->pdev->port;
139 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
140
141 parport_set_timeout(pp->pdev,
142 (file->f_flags & O_NONBLOCK) ?
143 PARPORT_INACTIVITY_O_NONBLOCK :
144 pp->default_inactivity);
145
146 while (bytes_read == 0) {
147 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE);
148
149 if (mode == IEEE1284_MODE_EPP) {
150 /* various specials for EPP mode */
151 int flags = 0;
152 size_t (*fn)(struct parport *, void *, size_t, int);
153
154 if (pp->flags & PP_W91284PIC)
155 flags |= PARPORT_W91284PIC;
156 if (pp->flags & PP_FASTREAD)
157 flags |= PARPORT_EPP_FAST;
158 if (pport->ieee1284.mode & IEEE1284_ADDR)
159 fn = pport->ops->epp_read_addr;
160 else
161 fn = pport->ops->epp_read_data;
162 bytes_read = (*fn)(pport, kbuffer, need, flags);
163 } else {
164 bytes_read = parport_read(pport, kbuffer, need);
165 }
166
167 if (bytes_read != 0)
168 break;
169
170 if (file->f_flags & O_NONBLOCK) {
171 bytes_read = -EAGAIN;
172 break;
173 }
174
175 if (signal_pending(current)) {
176 bytes_read = -ERESTARTSYS;
177 break;
178 }
179
180 cond_resched();
181 }
182
183 parport_set_timeout(pp->pdev, pp->default_inactivity);
184
185 if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read))
186 bytes_read = -EFAULT;
187
188 kfree(kbuffer);
189 pp_enable_irq(pp);
190 return bytes_read;
191}
192
193static ssize_t pp_write(struct file *file, const char __user *buf,
194 size_t count, loff_t *ppos)
195{
196 unsigned int minor = iminor(file_inode(file));
197 struct pp_struct *pp = file->private_data;
198 char *kbuffer;
199 ssize_t bytes_written = 0;
200 ssize_t wrote;
201 int mode;
202 struct parport *pport;
203
204 if (!(pp->flags & PP_CLAIMED)) {
205 /* Don't have the port claimed */
206 pr_debug(CHRDEV "%x: claim the port first\n", minor);
207 return -EINVAL;
208 }
209
210 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
211 if (!kbuffer)
212 return -ENOMEM;
213
214 pport = pp->pdev->port;
215 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
216
217 parport_set_timeout(pp->pdev,
218 (file->f_flags & O_NONBLOCK) ?
219 PARPORT_INACTIVITY_O_NONBLOCK :
220 pp->default_inactivity);
221
222 while (bytes_written < count) {
223 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE);
224
225 if (copy_from_user(kbuffer, buf + bytes_written, n)) {
226 bytes_written = -EFAULT;
227 break;
228 }
229
230 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) {
231 /* do a fast EPP write */
232 if (pport->ieee1284.mode & IEEE1284_ADDR) {
233 wrote = pport->ops->epp_write_addr(pport,
234 kbuffer, n, PARPORT_EPP_FAST);
235 } else {
236 wrote = pport->ops->epp_write_data(pport,
237 kbuffer, n, PARPORT_EPP_FAST);
238 }
239 } else {
240 wrote = parport_write(pp->pdev->port, kbuffer, n);
241 }
242
243 if (wrote <= 0) {
244 if (!bytes_written)
245 bytes_written = wrote;
246 break;
247 }
248
249 bytes_written += wrote;
250
251 if (file->f_flags & O_NONBLOCK) {
252 if (!bytes_written)
253 bytes_written = -EAGAIN;
254 break;
255 }
256
257 if (signal_pending(current))
258 break;
259
260 cond_resched();
261 }
262
263 parport_set_timeout(pp->pdev, pp->default_inactivity);
264
265 kfree(kbuffer);
266 pp_enable_irq(pp);
267 return bytes_written;
268}
269
270static void pp_irq(void *private)
271{
272 struct pp_struct *pp = private;
273
274 if (pp->irqresponse) {
275 parport_write_control(pp->pdev->port, pp->irqctl);
276 pp->irqresponse = 0;
277 }
278
279 atomic_inc(&pp->irqc);
280 wake_up_interruptible(&pp->irq_wait);
281}
282
283static int register_device(int minor, struct pp_struct *pp)
284{
285 struct parport *port;
286 struct pardevice *pdev = NULL;
287 char *name;
288 struct pardev_cb ppdev_cb;
289 int rc = 0, index;
290
291 name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor);
292 if (name == NULL)
293 return -ENOMEM;
294
295 port = parport_find_number(minor);
296 if (!port) {
297 pr_warn("%s: no associated port!\n", name);
298 rc = -ENXIO;
299 goto err;
300 }
301
302 index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL);
303 memset(&ppdev_cb, 0, sizeof(ppdev_cb));
304 ppdev_cb.irq_func = pp_irq;
305 ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
306 ppdev_cb.private = pp;
307 pdev = parport_register_dev_model(port, name, &ppdev_cb, index);
308 parport_put_port(port);
309
310 if (!pdev) {
311 pr_warn("%s: failed to register device!\n", name);
312 rc = -ENXIO;
313 ida_simple_remove(&ida_index, index);
314 goto err;
315 }
316
317 pp->pdev = pdev;
318 pp->index = index;
319 dev_dbg(&pdev->dev, "registered pardevice\n");
320err:
321 kfree(name);
322 return rc;
323}
324
325static enum ieee1284_phase init_phase(int mode)
326{
327 switch (mode & ~(IEEE1284_DEVICEID
328 | IEEE1284_ADDR)) {
329 case IEEE1284_MODE_NIBBLE:
330 case IEEE1284_MODE_BYTE:
331 return IEEE1284_PH_REV_IDLE;
332 }
333 return IEEE1284_PH_FWD_IDLE;
334}
335
336static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec)
337{
338 long to_jiffies;
339
340 if ((tv_sec < 0) || (tv_usec < 0))
341 return -EINVAL;
342
343 to_jiffies = usecs_to_jiffies(tv_usec);
344 to_jiffies += tv_sec * HZ;
345 if (to_jiffies <= 0)
346 return -EINVAL;
347
348 pdev->timeout = to_jiffies;
349 return 0;
350}
351
352static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
353{
354 unsigned int minor = iminor(file_inode(file));
355 struct pp_struct *pp = file->private_data;
356 struct parport *port;
357 void __user *argp = (void __user *)arg;
358 struct ieee1284_info *info;
359 unsigned char reg;
360 unsigned char mask;
361 int mode;
362 s32 time32[2];
363 s64 time64[2];
364 struct timespec64 ts;
365 int ret;
366
367 /* First handle the cases that don't take arguments. */
368 switch (cmd) {
369 case PPCLAIM:
370 {
371 if (pp->flags & PP_CLAIMED) {
372 dev_dbg(&pp->pdev->dev, "you've already got it!\n");
373 return -EINVAL;
374 }
375
376 /* Deferred device registration. */
377 if (!pp->pdev) {
378 int err = register_device(minor, pp);
379
380 if (err)
381 return err;
382 }
383
384 ret = parport_claim_or_block(pp->pdev);
385 if (ret < 0)
386 return ret;
387
388 pp->flags |= PP_CLAIMED;
389
390 /* For interrupt-reporting to work, we need to be
391 * informed of each interrupt. */
392 pp_enable_irq(pp);
393
394 /* We may need to fix up the state machine. */
395 info = &pp->pdev->port->ieee1284;
396 pp->saved_state.mode = info->mode;
397 pp->saved_state.phase = info->phase;
398 info->mode = pp->state.mode;
399 info->phase = pp->state.phase;
400 pp->default_inactivity = parport_set_timeout(pp->pdev, 0);
401 parport_set_timeout(pp->pdev, pp->default_inactivity);
402
403 return 0;
404 }
405 case PPEXCL:
406 if (pp->pdev) {
407 dev_dbg(&pp->pdev->dev,
408 "too late for PPEXCL; already registered\n");
409 if (pp->flags & PP_EXCL)
410 /* But it's not really an error. */
411 return 0;
412 /* There's no chance of making the driver happy. */
413 return -EINVAL;
414 }
415
416 /* Just remember to register the device exclusively
417 * when we finally do the registration. */
418 pp->flags |= PP_EXCL;
419 return 0;
420 case PPSETMODE:
421 {
422 int mode;
423
424 if (copy_from_user(&mode, argp, sizeof(mode)))
425 return -EFAULT;
426 /* FIXME: validate mode */
427 pp->state.mode = mode;
428 pp->state.phase = init_phase(mode);
429
430 if (pp->flags & PP_CLAIMED) {
431 pp->pdev->port->ieee1284.mode = mode;
432 pp->pdev->port->ieee1284.phase = pp->state.phase;
433 }
434
435 return 0;
436 }
437 case PPGETMODE:
438 {
439 int mode;
440
441 if (pp->flags & PP_CLAIMED)
442 mode = pp->pdev->port->ieee1284.mode;
443 else
444 mode = pp->state.mode;
445
446 if (copy_to_user(argp, &mode, sizeof(mode)))
447 return -EFAULT;
448 return 0;
449 }
450 case PPSETPHASE:
451 {
452 int phase;
453
454 if (copy_from_user(&phase, argp, sizeof(phase)))
455 return -EFAULT;
456
457 /* FIXME: validate phase */
458 pp->state.phase = phase;
459
460 if (pp->flags & PP_CLAIMED)
461 pp->pdev->port->ieee1284.phase = phase;
462
463 return 0;
464 }
465 case PPGETPHASE:
466 {
467 int phase;
468
469 if (pp->flags & PP_CLAIMED)
470 phase = pp->pdev->port->ieee1284.phase;
471 else
472 phase = pp->state.phase;
473 if (copy_to_user(argp, &phase, sizeof(phase)))
474 return -EFAULT;
475 return 0;
476 }
477 case PPGETMODES:
478 {
479 unsigned int modes;
480
481 port = parport_find_number(minor);
482 if (!port)
483 return -ENODEV;
484
485 modes = port->modes;
486 parport_put_port(port);
487 if (copy_to_user(argp, &modes, sizeof(modes)))
488 return -EFAULT;
489 return 0;
490 }
491 case PPSETFLAGS:
492 {
493 int uflags;
494
495 if (copy_from_user(&uflags, argp, sizeof(uflags)))
496 return -EFAULT;
497 pp->flags &= ~PP_FLAGMASK;
498 pp->flags |= (uflags & PP_FLAGMASK);
499 return 0;
500 }
501 case PPGETFLAGS:
502 {
503 int uflags;
504
505 uflags = pp->flags & PP_FLAGMASK;
506 if (copy_to_user(argp, &uflags, sizeof(uflags)))
507 return -EFAULT;
508 return 0;
509 }
510 } /* end switch() */
511
512 /* Everything else requires the port to be claimed, so check
513 * that now. */
514 if ((pp->flags & PP_CLAIMED) == 0) {
515 pr_debug(CHRDEV "%x: claim the port first\n", minor);
516 return -EINVAL;
517 }
518
519 port = pp->pdev->port;
520 switch (cmd) {
521 case PPRSTATUS:
522 reg = parport_read_status(port);
523 if (copy_to_user(argp, ®, sizeof(reg)))
524 return -EFAULT;
525 return 0;
526 case PPRDATA:
527 reg = parport_read_data(port);
528 if (copy_to_user(argp, ®, sizeof(reg)))
529 return -EFAULT;
530 return 0;
531 case PPRCONTROL:
532 reg = parport_read_control(port);
533 if (copy_to_user(argp, ®, sizeof(reg)))
534 return -EFAULT;
535 return 0;
536 case PPYIELD:
537 parport_yield_blocking(pp->pdev);
538 return 0;
539
540 case PPRELEASE:
541 /* Save the state machine's state. */
542 info = &pp->pdev->port->ieee1284;
543 pp->state.mode = info->mode;
544 pp->state.phase = info->phase;
545 info->mode = pp->saved_state.mode;
546 info->phase = pp->saved_state.phase;
547 parport_release(pp->pdev);
548 pp->flags &= ~PP_CLAIMED;
549 return 0;
550
551 case PPWCONTROL:
552 if (copy_from_user(®, argp, sizeof(reg)))
553 return -EFAULT;
554 parport_write_control(port, reg);
555 return 0;
556
557 case PPWDATA:
558 if (copy_from_user(®, argp, sizeof(reg)))
559 return -EFAULT;
560 parport_write_data(port, reg);
561 return 0;
562
563 case PPFCONTROL:
564 if (copy_from_user(&mask, argp,
565 sizeof(mask)))
566 return -EFAULT;
567 if (copy_from_user(®, 1 + (unsigned char __user *) arg,
568 sizeof(reg)))
569 return -EFAULT;
570 parport_frob_control(port, mask, reg);
571 return 0;
572
573 case PPDATADIR:
574 if (copy_from_user(&mode, argp, sizeof(mode)))
575 return -EFAULT;
576 if (mode)
577 port->ops->data_reverse(port);
578 else
579 port->ops->data_forward(port);
580 return 0;
581
582 case PPNEGOT:
583 if (copy_from_user(&mode, argp, sizeof(mode)))
584 return -EFAULT;
585 switch ((ret = parport_negotiate(port, mode))) {
586 case 0: break;
587 case -1: /* handshake failed, peripheral not IEEE 1284 */
588 ret = -EIO;
589 break;
590 case 1: /* handshake succeeded, peripheral rejected mode */
591 ret = -ENXIO;
592 break;
593 }
594 pp_enable_irq(pp);
595 return ret;
596
597 case PPWCTLONIRQ:
598 if (copy_from_user(®, argp, sizeof(reg)))
599 return -EFAULT;
600
601 /* Remember what to set the control lines to, for next
602 * time we get an interrupt. */
603 pp->irqctl = reg;
604 pp->irqresponse = 1;
605 return 0;
606
607 case PPCLRIRQ:
608 ret = atomic_read(&pp->irqc);
609 if (copy_to_user(argp, &ret, sizeof(ret)))
610 return -EFAULT;
611 atomic_sub(ret, &pp->irqc);
612 return 0;
613
614 case PPSETTIME32:
615 if (copy_from_user(time32, argp, sizeof(time32)))
616 return -EFAULT;
617
618 if ((time32[0] < 0) || (time32[1] < 0))
619 return -EINVAL;
620
621 return pp_set_timeout(pp->pdev, time32[0], time32[1]);
622
623 case PPSETTIME64:
624 if (copy_from_user(time64, argp, sizeof(time64)))
625 return -EFAULT;
626
627 if ((time64[0] < 0) || (time64[1] < 0))
628 return -EINVAL;
629
630 if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall())
631 time64[1] >>= 32;
632
633 return pp_set_timeout(pp->pdev, time64[0], time64[1]);
634
635 case PPGETTIME32:
636 jiffies_to_timespec64(pp->pdev->timeout, &ts);
637 time32[0] = ts.tv_sec;
638 time32[1] = ts.tv_nsec / NSEC_PER_USEC;
639
640 if (copy_to_user(argp, time32, sizeof(time32)))
641 return -EFAULT;
642
643 return 0;
644
645 case PPGETTIME64:
646 jiffies_to_timespec64(pp->pdev->timeout, &ts);
647 time64[0] = ts.tv_sec;
648 time64[1] = ts.tv_nsec / NSEC_PER_USEC;
649
650 if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall())
651 time64[1] <<= 32;
652
653 if (copy_to_user(argp, time64, sizeof(time64)))
654 return -EFAULT;
655
656 return 0;
657
658 default:
659 dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd);
660 return -EINVAL;
661 }
662
663 /* Keep the compiler happy */
664 return 0;
665}
666
667static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
668{
669 long ret;
670
671 mutex_lock(&pp_do_mutex);
672 ret = pp_do_ioctl(file, cmd, arg);
673 mutex_unlock(&pp_do_mutex);
674 return ret;
675}
676
677static int pp_open(struct inode *inode, struct file *file)
678{
679 unsigned int minor = iminor(inode);
680 struct pp_struct *pp;
681
682 if (minor >= PARPORT_MAX)
683 return -ENXIO;
684
685 pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL);
686 if (!pp)
687 return -ENOMEM;
688
689 pp->state.mode = IEEE1284_MODE_COMPAT;
690 pp->state.phase = init_phase(pp->state.mode);
691 pp->flags = 0;
692 pp->irqresponse = 0;
693 atomic_set(&pp->irqc, 0);
694 init_waitqueue_head(&pp->irq_wait);
695
696 /* Defer the actual device registration until the first claim.
697 * That way, we know whether or not the driver wants to have
698 * exclusive access to the port (PPEXCL).
699 */
700 pp->pdev = NULL;
701 file->private_data = pp;
702
703 return 0;
704}
705
706static int pp_release(struct inode *inode, struct file *file)
707{
708 unsigned int minor = iminor(inode);
709 struct pp_struct *pp = file->private_data;
710 int compat_negot;
711
712 compat_negot = 0;
713 if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
714 (pp->state.mode != IEEE1284_MODE_COMPAT)) {
715 struct ieee1284_info *info;
716
717 /* parport released, but not in compatibility mode */
718 parport_claim_or_block(pp->pdev);
719 pp->flags |= PP_CLAIMED;
720 info = &pp->pdev->port->ieee1284;
721 pp->saved_state.mode = info->mode;
722 pp->saved_state.phase = info->phase;
723 info->mode = pp->state.mode;
724 info->phase = pp->state.phase;
725 compat_negot = 1;
726 } else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
727 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
728 compat_negot = 2;
729 }
730 if (compat_negot) {
731 parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT);
732 dev_dbg(&pp->pdev->dev,
733 "negotiated back to compatibility mode because user-space forgot\n");
734 }
735
736 if ((pp->flags & PP_CLAIMED) && pp->pdev) {
737 struct ieee1284_info *info;
738
739 info = &pp->pdev->port->ieee1284;
740 pp->state.mode = info->mode;
741 pp->state.phase = info->phase;
742 info->mode = pp->saved_state.mode;
743 info->phase = pp->saved_state.phase;
744 parport_release(pp->pdev);
745 if (compat_negot != 1) {
746 pr_debug(CHRDEV "%x: released pardevice "
747 "because user-space forgot\n", minor);
748 }
749 }
750
751 if (pp->pdev) {
752 parport_unregister_device(pp->pdev);
753 ida_simple_remove(&ida_index, pp->index);
754 pp->pdev = NULL;
755 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor);
756 }
757
758 kfree(pp);
759
760 return 0;
761}
762
763/* No kernel lock held - fine */
764static __poll_t pp_poll(struct file *file, poll_table *wait)
765{
766 struct pp_struct *pp = file->private_data;
767 __poll_t mask = 0;
768
769 poll_wait(file, &pp->irq_wait, wait);
770 if (atomic_read(&pp->irqc))
771 mask |= EPOLLIN | EPOLLRDNORM;
772
773 return mask;
774}
775
776static struct class *ppdev_class;
777
778static const struct file_operations pp_fops = {
779 .owner = THIS_MODULE,
780 .llseek = no_llseek,
781 .read = pp_read,
782 .write = pp_write,
783 .poll = pp_poll,
784 .unlocked_ioctl = pp_ioctl,
785 .compat_ioctl = compat_ptr_ioctl,
786 .open = pp_open,
787 .release = pp_release,
788};
789
790static void pp_attach(struct parport *port)
791{
792 struct device *ret;
793
794 if (devices[port->number])
795 return;
796
797 ret = device_create(ppdev_class, port->dev,
798 MKDEV(PP_MAJOR, port->number), NULL,
799 "parport%d", port->number);
800 if (IS_ERR(ret)) {
801 pr_err("Failed to create device parport%d\n",
802 port->number);
803 return;
804 }
805 devices[port->number] = ret;
806}
807
808static void pp_detach(struct parport *port)
809{
810 if (!devices[port->number])
811 return;
812
813 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
814 devices[port->number] = NULL;
815}
816
817static int pp_probe(struct pardevice *par_dev)
818{
819 struct device_driver *drv = par_dev->dev.driver;
820 int len = strlen(drv->name);
821
822 if (strncmp(par_dev->name, drv->name, len))
823 return -ENODEV;
824
825 return 0;
826}
827
828static struct parport_driver pp_driver = {
829 .name = CHRDEV,
830 .probe = pp_probe,
831 .match_port = pp_attach,
832 .detach = pp_detach,
833 .devmodel = true,
834};
835
836static int __init ppdev_init(void)
837{
838 int err = 0;
839
840 if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) {
841 pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR);
842 return -EIO;
843 }
844 ppdev_class = class_create(THIS_MODULE, CHRDEV);
845 if (IS_ERR(ppdev_class)) {
846 err = PTR_ERR(ppdev_class);
847 goto out_chrdev;
848 }
849 err = parport_register_driver(&pp_driver);
850 if (err < 0) {
851 pr_warn(CHRDEV ": unable to register with parport\n");
852 goto out_class;
853 }
854
855 pr_info(PP_VERSION "\n");
856 goto out;
857
858out_class:
859 class_destroy(ppdev_class);
860out_chrdev:
861 unregister_chrdev(PP_MAJOR, CHRDEV);
862out:
863 return err;
864}
865
866static void __exit ppdev_cleanup(void)
867{
868 /* Clean up all parport stuff */
869 parport_unregister_driver(&pp_driver);
870 class_destroy(ppdev_class);
871 unregister_chrdev(PP_MAJOR, CHRDEV);
872}
873
874module_init(ppdev_init);
875module_exit(ppdev_cleanup);
876
877MODULE_LICENSE("GPL");
878MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);
1/*
2 * linux/drivers/char/ppdev.c
3 *
4 * This is the code behind /dev/parport* -- it allows a user-space
5 * application to use the parport subsystem.
6 *
7 * Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * A /dev/parportx device node represents an arbitrary device
15 * on port 'x'. The following operations are possible:
16 *
17 * open do nothing, set up default IEEE 1284 protocol to be COMPAT
18 * close release port and unregister device (if necessary)
19 * ioctl
20 * EXCL register device exclusively (may fail)
21 * CLAIM (register device first time) parport_claim_or_block
22 * RELEASE parport_release
23 * SETMODE set the IEEE 1284 protocol to use for read/write
24 * SETPHASE set the IEEE 1284 phase of a particular mode. Not to be
25 * confused with ioctl(fd, SETPHASER, &stun). ;-)
26 * DATADIR data_forward / data_reverse
27 * WDATA write_data
28 * RDATA read_data
29 * WCONTROL write_control
30 * RCONTROL read_control
31 * FCONTROL frob_control
32 * RSTATUS read_status
33 * NEGOT parport_negotiate
34 * YIELD parport_yield_blocking
35 * WCTLONIRQ on interrupt, set control lines
36 * CLRIRQ clear (and return) interrupt count
37 * SETTIME sets device timeout (struct timeval)
38 * GETTIME gets device timeout (struct timeval)
39 * GETMODES gets hardware supported modes (unsigned int)
40 * GETMODE gets the current IEEE1284 mode
41 * GETPHASE gets the current IEEE1284 phase
42 * GETFLAGS gets current (user-visible) flags
43 * SETFLAGS sets current (user-visible) flags
44 * read/write read or write in current IEEE 1284 protocol
45 * select wait for interrupt (in readfds)
46 *
47 * Changes:
48 * Added SETTIME/GETTIME ioctl, Fred Barnes, 1999.
49 *
50 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 2000/08/25
51 * - On error, copy_from_user and copy_to_user do not return -EFAULT,
52 * They return the positive number of bytes *not* copied due to address
53 * space errors.
54 *
55 * Added GETMODES/GETMODE/GETPHASE ioctls, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001.
56 * Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001
57 */
58
59#include <linux/module.h>
60#include <linux/init.h>
61#include <linux/sched/signal.h>
62#include <linux/device.h>
63#include <linux/ioctl.h>
64#include <linux/parport.h>
65#include <linux/ctype.h>
66#include <linux/poll.h>
67#include <linux/slab.h>
68#include <linux/major.h>
69#include <linux/ppdev.h>
70#include <linux/mutex.h>
71#include <linux/uaccess.h>
72#include <linux/compat.h>
73
74#define PP_VERSION "ppdev: user-space parallel port driver"
75#define CHRDEV "ppdev"
76
77struct pp_struct {
78 struct pardevice *pdev;
79 wait_queue_head_t irq_wait;
80 atomic_t irqc;
81 unsigned int flags;
82 int irqresponse;
83 unsigned char irqctl;
84 struct ieee1284_info state;
85 struct ieee1284_info saved_state;
86 long default_inactivity;
87 int index;
88};
89
90/* should we use PARDEVICE_MAX here? */
91static struct device *devices[PARPORT_MAX];
92
93static DEFINE_IDA(ida_index);
94
95/* pp_struct.flags bitfields */
96#define PP_CLAIMED (1<<0)
97#define PP_EXCL (1<<1)
98
99/* Other constants */
100#define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */
101#define PP_BUFFER_SIZE 1024
102#define PARDEVICE_MAX 8
103
104static DEFINE_MUTEX(pp_do_mutex);
105
106/* define fixed sized ioctl cmd for y2038 migration */
107#define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2])
108#define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2])
109#define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2])
110#define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2])
111
112static inline void pp_enable_irq(struct pp_struct *pp)
113{
114 struct parport *port = pp->pdev->port;
115
116 port->ops->enable_irq(port);
117}
118
119static ssize_t pp_read(struct file *file, char __user *buf, size_t count,
120 loff_t *ppos)
121{
122 unsigned int minor = iminor(file_inode(file));
123 struct pp_struct *pp = file->private_data;
124 char *kbuffer;
125 ssize_t bytes_read = 0;
126 struct parport *pport;
127 int mode;
128
129 if (!(pp->flags & PP_CLAIMED)) {
130 /* Don't have the port claimed */
131 pr_debug(CHRDEV "%x: claim the port first\n", minor);
132 return -EINVAL;
133 }
134
135 /* Trivial case. */
136 if (count == 0)
137 return 0;
138
139 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
140 if (!kbuffer)
141 return -ENOMEM;
142 pport = pp->pdev->port;
143 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
144
145 parport_set_timeout(pp->pdev,
146 (file->f_flags & O_NONBLOCK) ?
147 PARPORT_INACTIVITY_O_NONBLOCK :
148 pp->default_inactivity);
149
150 while (bytes_read == 0) {
151 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE);
152
153 if (mode == IEEE1284_MODE_EPP) {
154 /* various specials for EPP mode */
155 int flags = 0;
156 size_t (*fn)(struct parport *, void *, size_t, int);
157
158 if (pp->flags & PP_W91284PIC)
159 flags |= PARPORT_W91284PIC;
160 if (pp->flags & PP_FASTREAD)
161 flags |= PARPORT_EPP_FAST;
162 if (pport->ieee1284.mode & IEEE1284_ADDR)
163 fn = pport->ops->epp_read_addr;
164 else
165 fn = pport->ops->epp_read_data;
166 bytes_read = (*fn)(pport, kbuffer, need, flags);
167 } else {
168 bytes_read = parport_read(pport, kbuffer, need);
169 }
170
171 if (bytes_read != 0)
172 break;
173
174 if (file->f_flags & O_NONBLOCK) {
175 bytes_read = -EAGAIN;
176 break;
177 }
178
179 if (signal_pending(current)) {
180 bytes_read = -ERESTARTSYS;
181 break;
182 }
183
184 cond_resched();
185 }
186
187 parport_set_timeout(pp->pdev, pp->default_inactivity);
188
189 if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read))
190 bytes_read = -EFAULT;
191
192 kfree(kbuffer);
193 pp_enable_irq(pp);
194 return bytes_read;
195}
196
197static ssize_t pp_write(struct file *file, const char __user *buf,
198 size_t count, loff_t *ppos)
199{
200 unsigned int minor = iminor(file_inode(file));
201 struct pp_struct *pp = file->private_data;
202 char *kbuffer;
203 ssize_t bytes_written = 0;
204 ssize_t wrote;
205 int mode;
206 struct parport *pport;
207
208 if (!(pp->flags & PP_CLAIMED)) {
209 /* Don't have the port claimed */
210 pr_debug(CHRDEV "%x: claim the port first\n", minor);
211 return -EINVAL;
212 }
213
214 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
215 if (!kbuffer)
216 return -ENOMEM;
217
218 pport = pp->pdev->port;
219 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
220
221 parport_set_timeout(pp->pdev,
222 (file->f_flags & O_NONBLOCK) ?
223 PARPORT_INACTIVITY_O_NONBLOCK :
224 pp->default_inactivity);
225
226 while (bytes_written < count) {
227 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE);
228
229 if (copy_from_user(kbuffer, buf + bytes_written, n)) {
230 bytes_written = -EFAULT;
231 break;
232 }
233
234 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) {
235 /* do a fast EPP write */
236 if (pport->ieee1284.mode & IEEE1284_ADDR) {
237 wrote = pport->ops->epp_write_addr(pport,
238 kbuffer, n, PARPORT_EPP_FAST);
239 } else {
240 wrote = pport->ops->epp_write_data(pport,
241 kbuffer, n, PARPORT_EPP_FAST);
242 }
243 } else {
244 wrote = parport_write(pp->pdev->port, kbuffer, n);
245 }
246
247 if (wrote <= 0) {
248 if (!bytes_written)
249 bytes_written = wrote;
250 break;
251 }
252
253 bytes_written += wrote;
254
255 if (file->f_flags & O_NONBLOCK) {
256 if (!bytes_written)
257 bytes_written = -EAGAIN;
258 break;
259 }
260
261 if (signal_pending(current))
262 break;
263
264 cond_resched();
265 }
266
267 parport_set_timeout(pp->pdev, pp->default_inactivity);
268
269 kfree(kbuffer);
270 pp_enable_irq(pp);
271 return bytes_written;
272}
273
274static void pp_irq(void *private)
275{
276 struct pp_struct *pp = private;
277
278 if (pp->irqresponse) {
279 parport_write_control(pp->pdev->port, pp->irqctl);
280 pp->irqresponse = 0;
281 }
282
283 atomic_inc(&pp->irqc);
284 wake_up_interruptible(&pp->irq_wait);
285}
286
287static int register_device(int minor, struct pp_struct *pp)
288{
289 struct parport *port;
290 struct pardevice *pdev = NULL;
291 char *name;
292 struct pardev_cb ppdev_cb;
293 int rc = 0, index;
294
295 name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor);
296 if (name == NULL)
297 return -ENOMEM;
298
299 port = parport_find_number(minor);
300 if (!port) {
301 pr_warn("%s: no associated port!\n", name);
302 rc = -ENXIO;
303 goto err;
304 }
305
306 index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL);
307 memset(&ppdev_cb, 0, sizeof(ppdev_cb));
308 ppdev_cb.irq_func = pp_irq;
309 ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
310 ppdev_cb.private = pp;
311 pdev = parport_register_dev_model(port, name, &ppdev_cb, index);
312 parport_put_port(port);
313
314 if (!pdev) {
315 pr_warn("%s: failed to register device!\n", name);
316 rc = -ENXIO;
317 ida_simple_remove(&ida_index, index);
318 goto err;
319 }
320
321 pp->pdev = pdev;
322 pp->index = index;
323 dev_dbg(&pdev->dev, "registered pardevice\n");
324err:
325 kfree(name);
326 return rc;
327}
328
329static enum ieee1284_phase init_phase(int mode)
330{
331 switch (mode & ~(IEEE1284_DEVICEID
332 | IEEE1284_ADDR)) {
333 case IEEE1284_MODE_NIBBLE:
334 case IEEE1284_MODE_BYTE:
335 return IEEE1284_PH_REV_IDLE;
336 }
337 return IEEE1284_PH_FWD_IDLE;
338}
339
340static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec)
341{
342 long to_jiffies;
343
344 if ((tv_sec < 0) || (tv_usec < 0))
345 return -EINVAL;
346
347 to_jiffies = usecs_to_jiffies(tv_usec);
348 to_jiffies += tv_sec * HZ;
349 if (to_jiffies <= 0)
350 return -EINVAL;
351
352 pdev->timeout = to_jiffies;
353 return 0;
354}
355
356static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
357{
358 unsigned int minor = iminor(file_inode(file));
359 struct pp_struct *pp = file->private_data;
360 struct parport *port;
361 void __user *argp = (void __user *)arg;
362
363 /* First handle the cases that don't take arguments. */
364 switch (cmd) {
365 case PPCLAIM:
366 {
367 struct ieee1284_info *info;
368 int ret;
369
370 if (pp->flags & PP_CLAIMED) {
371 dev_dbg(&pp->pdev->dev, "you've already got it!\n");
372 return -EINVAL;
373 }
374
375 /* Deferred device registration. */
376 if (!pp->pdev) {
377 int err = register_device(minor, pp);
378
379 if (err)
380 return err;
381 }
382
383 ret = parport_claim_or_block(pp->pdev);
384 if (ret < 0)
385 return ret;
386
387 pp->flags |= PP_CLAIMED;
388
389 /* For interrupt-reporting to work, we need to be
390 * informed of each interrupt. */
391 pp_enable_irq(pp);
392
393 /* We may need to fix up the state machine. */
394 info = &pp->pdev->port->ieee1284;
395 pp->saved_state.mode = info->mode;
396 pp->saved_state.phase = info->phase;
397 info->mode = pp->state.mode;
398 info->phase = pp->state.phase;
399 pp->default_inactivity = parport_set_timeout(pp->pdev, 0);
400 parport_set_timeout(pp->pdev, pp->default_inactivity);
401
402 return 0;
403 }
404 case PPEXCL:
405 if (pp->pdev) {
406 dev_dbg(&pp->pdev->dev,
407 "too late for PPEXCL; already registered\n");
408 if (pp->flags & PP_EXCL)
409 /* But it's not really an error. */
410 return 0;
411 /* There's no chance of making the driver happy. */
412 return -EINVAL;
413 }
414
415 /* Just remember to register the device exclusively
416 * when we finally do the registration. */
417 pp->flags |= PP_EXCL;
418 return 0;
419 case PPSETMODE:
420 {
421 int mode;
422
423 if (copy_from_user(&mode, argp, sizeof(mode)))
424 return -EFAULT;
425 /* FIXME: validate mode */
426 pp->state.mode = mode;
427 pp->state.phase = init_phase(mode);
428
429 if (pp->flags & PP_CLAIMED) {
430 pp->pdev->port->ieee1284.mode = mode;
431 pp->pdev->port->ieee1284.phase = pp->state.phase;
432 }
433
434 return 0;
435 }
436 case PPGETMODE:
437 {
438 int mode;
439
440 if (pp->flags & PP_CLAIMED)
441 mode = pp->pdev->port->ieee1284.mode;
442 else
443 mode = pp->state.mode;
444
445 if (copy_to_user(argp, &mode, sizeof(mode)))
446 return -EFAULT;
447 return 0;
448 }
449 case PPSETPHASE:
450 {
451 int phase;
452
453 if (copy_from_user(&phase, argp, sizeof(phase)))
454 return -EFAULT;
455
456 /* FIXME: validate phase */
457 pp->state.phase = phase;
458
459 if (pp->flags & PP_CLAIMED)
460 pp->pdev->port->ieee1284.phase = phase;
461
462 return 0;
463 }
464 case PPGETPHASE:
465 {
466 int phase;
467
468 if (pp->flags & PP_CLAIMED)
469 phase = pp->pdev->port->ieee1284.phase;
470 else
471 phase = pp->state.phase;
472 if (copy_to_user(argp, &phase, sizeof(phase)))
473 return -EFAULT;
474 return 0;
475 }
476 case PPGETMODES:
477 {
478 unsigned int modes;
479
480 port = parport_find_number(minor);
481 if (!port)
482 return -ENODEV;
483
484 modes = port->modes;
485 parport_put_port(port);
486 if (copy_to_user(argp, &modes, sizeof(modes)))
487 return -EFAULT;
488 return 0;
489 }
490 case PPSETFLAGS:
491 {
492 int uflags;
493
494 if (copy_from_user(&uflags, argp, sizeof(uflags)))
495 return -EFAULT;
496 pp->flags &= ~PP_FLAGMASK;
497 pp->flags |= (uflags & PP_FLAGMASK);
498 return 0;
499 }
500 case PPGETFLAGS:
501 {
502 int uflags;
503
504 uflags = pp->flags & PP_FLAGMASK;
505 if (copy_to_user(argp, &uflags, sizeof(uflags)))
506 return -EFAULT;
507 return 0;
508 }
509 } /* end switch() */
510
511 /* Everything else requires the port to be claimed, so check
512 * that now. */
513 if ((pp->flags & PP_CLAIMED) == 0) {
514 pr_debug(CHRDEV "%x: claim the port first\n", minor);
515 return -EINVAL;
516 }
517
518 port = pp->pdev->port;
519 switch (cmd) {
520 struct ieee1284_info *info;
521 unsigned char reg;
522 unsigned char mask;
523 int mode;
524 s32 time32[2];
525 s64 time64[2];
526 struct timespec64 ts;
527 int ret;
528
529 case PPRSTATUS:
530 reg = parport_read_status(port);
531 if (copy_to_user(argp, ®, sizeof(reg)))
532 return -EFAULT;
533 return 0;
534 case PPRDATA:
535 reg = parport_read_data(port);
536 if (copy_to_user(argp, ®, sizeof(reg)))
537 return -EFAULT;
538 return 0;
539 case PPRCONTROL:
540 reg = parport_read_control(port);
541 if (copy_to_user(argp, ®, sizeof(reg)))
542 return -EFAULT;
543 return 0;
544 case PPYIELD:
545 parport_yield_blocking(pp->pdev);
546 return 0;
547
548 case PPRELEASE:
549 /* Save the state machine's state. */
550 info = &pp->pdev->port->ieee1284;
551 pp->state.mode = info->mode;
552 pp->state.phase = info->phase;
553 info->mode = pp->saved_state.mode;
554 info->phase = pp->saved_state.phase;
555 parport_release(pp->pdev);
556 pp->flags &= ~PP_CLAIMED;
557 return 0;
558
559 case PPWCONTROL:
560 if (copy_from_user(®, argp, sizeof(reg)))
561 return -EFAULT;
562 parport_write_control(port, reg);
563 return 0;
564
565 case PPWDATA:
566 if (copy_from_user(®, argp, sizeof(reg)))
567 return -EFAULT;
568 parport_write_data(port, reg);
569 return 0;
570
571 case PPFCONTROL:
572 if (copy_from_user(&mask, argp,
573 sizeof(mask)))
574 return -EFAULT;
575 if (copy_from_user(®, 1 + (unsigned char __user *) arg,
576 sizeof(reg)))
577 return -EFAULT;
578 parport_frob_control(port, mask, reg);
579 return 0;
580
581 case PPDATADIR:
582 if (copy_from_user(&mode, argp, sizeof(mode)))
583 return -EFAULT;
584 if (mode)
585 port->ops->data_reverse(port);
586 else
587 port->ops->data_forward(port);
588 return 0;
589
590 case PPNEGOT:
591 if (copy_from_user(&mode, argp, sizeof(mode)))
592 return -EFAULT;
593 switch ((ret = parport_negotiate(port, mode))) {
594 case 0: break;
595 case -1: /* handshake failed, peripheral not IEEE 1284 */
596 ret = -EIO;
597 break;
598 case 1: /* handshake succeeded, peripheral rejected mode */
599 ret = -ENXIO;
600 break;
601 }
602 pp_enable_irq(pp);
603 return ret;
604
605 case PPWCTLONIRQ:
606 if (copy_from_user(®, argp, sizeof(reg)))
607 return -EFAULT;
608
609 /* Remember what to set the control lines to, for next
610 * time we get an interrupt. */
611 pp->irqctl = reg;
612 pp->irqresponse = 1;
613 return 0;
614
615 case PPCLRIRQ:
616 ret = atomic_read(&pp->irqc);
617 if (copy_to_user(argp, &ret, sizeof(ret)))
618 return -EFAULT;
619 atomic_sub(ret, &pp->irqc);
620 return 0;
621
622 case PPSETTIME32:
623 if (copy_from_user(time32, argp, sizeof(time32)))
624 return -EFAULT;
625
626 return pp_set_timeout(pp->pdev, time32[0], time32[1]);
627
628 case PPSETTIME64:
629 if (copy_from_user(time64, argp, sizeof(time64)))
630 return -EFAULT;
631
632 return pp_set_timeout(pp->pdev, time64[0], time64[1]);
633
634 case PPGETTIME32:
635 jiffies_to_timespec64(pp->pdev->timeout, &ts);
636 time32[0] = ts.tv_sec;
637 time32[1] = ts.tv_nsec / NSEC_PER_USEC;
638 if ((time32[0] < 0) || (time32[1] < 0))
639 return -EINVAL;
640
641 if (copy_to_user(argp, time32, sizeof(time32)))
642 return -EFAULT;
643
644 return 0;
645
646 case PPGETTIME64:
647 jiffies_to_timespec64(pp->pdev->timeout, &ts);
648 time64[0] = ts.tv_sec;
649 time64[1] = ts.tv_nsec / NSEC_PER_USEC;
650 if ((time64[0] < 0) || (time64[1] < 0))
651 return -EINVAL;
652
653 if (copy_to_user(argp, time64, sizeof(time64)))
654 return -EFAULT;
655
656 return 0;
657
658 default:
659 dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd);
660 return -EINVAL;
661 }
662
663 /* Keep the compiler happy */
664 return 0;
665}
666
667static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
668{
669 long ret;
670
671 mutex_lock(&pp_do_mutex);
672 ret = pp_do_ioctl(file, cmd, arg);
673 mutex_unlock(&pp_do_mutex);
674 return ret;
675}
676
677#ifdef CONFIG_COMPAT
678static long pp_compat_ioctl(struct file *file, unsigned int cmd,
679 unsigned long arg)
680{
681 return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
682}
683#endif
684
685static int pp_open(struct inode *inode, struct file *file)
686{
687 unsigned int minor = iminor(inode);
688 struct pp_struct *pp;
689
690 if (minor >= PARPORT_MAX)
691 return -ENXIO;
692
693 pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL);
694 if (!pp)
695 return -ENOMEM;
696
697 pp->state.mode = IEEE1284_MODE_COMPAT;
698 pp->state.phase = init_phase(pp->state.mode);
699 pp->flags = 0;
700 pp->irqresponse = 0;
701 atomic_set(&pp->irqc, 0);
702 init_waitqueue_head(&pp->irq_wait);
703
704 /* Defer the actual device registration until the first claim.
705 * That way, we know whether or not the driver wants to have
706 * exclusive access to the port (PPEXCL).
707 */
708 pp->pdev = NULL;
709 file->private_data = pp;
710
711 return 0;
712}
713
714static int pp_release(struct inode *inode, struct file *file)
715{
716 unsigned int minor = iminor(inode);
717 struct pp_struct *pp = file->private_data;
718 int compat_negot;
719
720 compat_negot = 0;
721 if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
722 (pp->state.mode != IEEE1284_MODE_COMPAT)) {
723 struct ieee1284_info *info;
724
725 /* parport released, but not in compatibility mode */
726 parport_claim_or_block(pp->pdev);
727 pp->flags |= PP_CLAIMED;
728 info = &pp->pdev->port->ieee1284;
729 pp->saved_state.mode = info->mode;
730 pp->saved_state.phase = info->phase;
731 info->mode = pp->state.mode;
732 info->phase = pp->state.phase;
733 compat_negot = 1;
734 } else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
735 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
736 compat_negot = 2;
737 }
738 if (compat_negot) {
739 parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT);
740 dev_dbg(&pp->pdev->dev,
741 "negotiated back to compatibility mode because user-space forgot\n");
742 }
743
744 if (pp->flags & PP_CLAIMED) {
745 struct ieee1284_info *info;
746
747 info = &pp->pdev->port->ieee1284;
748 pp->state.mode = info->mode;
749 pp->state.phase = info->phase;
750 info->mode = pp->saved_state.mode;
751 info->phase = pp->saved_state.phase;
752 parport_release(pp->pdev);
753 if (compat_negot != 1) {
754 pr_debug(CHRDEV "%x: released pardevice "
755 "because user-space forgot\n", minor);
756 }
757 }
758
759 if (pp->pdev) {
760 parport_unregister_device(pp->pdev);
761 ida_simple_remove(&ida_index, pp->index);
762 pp->pdev = NULL;
763 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor);
764 }
765
766 kfree(pp);
767
768 return 0;
769}
770
771/* No kernel lock held - fine */
772static __poll_t pp_poll(struct file *file, poll_table *wait)
773{
774 struct pp_struct *pp = file->private_data;
775 __poll_t mask = 0;
776
777 poll_wait(file, &pp->irq_wait, wait);
778 if (atomic_read(&pp->irqc))
779 mask |= EPOLLIN | EPOLLRDNORM;
780
781 return mask;
782}
783
784static struct class *ppdev_class;
785
786static const struct file_operations pp_fops = {
787 .owner = THIS_MODULE,
788 .llseek = no_llseek,
789 .read = pp_read,
790 .write = pp_write,
791 .poll = pp_poll,
792 .unlocked_ioctl = pp_ioctl,
793#ifdef CONFIG_COMPAT
794 .compat_ioctl = pp_compat_ioctl,
795#endif
796 .open = pp_open,
797 .release = pp_release,
798};
799
800static void pp_attach(struct parport *port)
801{
802 struct device *ret;
803
804 if (devices[port->number])
805 return;
806
807 ret = device_create(ppdev_class, port->dev,
808 MKDEV(PP_MAJOR, port->number), NULL,
809 "parport%d", port->number);
810 if (IS_ERR(ret)) {
811 pr_err("Failed to create device parport%d\n",
812 port->number);
813 return;
814 }
815 devices[port->number] = ret;
816}
817
818static void pp_detach(struct parport *port)
819{
820 if (!devices[port->number])
821 return;
822
823 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
824 devices[port->number] = NULL;
825}
826
827static int pp_probe(struct pardevice *par_dev)
828{
829 struct device_driver *drv = par_dev->dev.driver;
830 int len = strlen(drv->name);
831
832 if (strncmp(par_dev->name, drv->name, len))
833 return -ENODEV;
834
835 return 0;
836}
837
838static struct parport_driver pp_driver = {
839 .name = CHRDEV,
840 .probe = pp_probe,
841 .match_port = pp_attach,
842 .detach = pp_detach,
843 .devmodel = true,
844};
845
846static int __init ppdev_init(void)
847{
848 int err = 0;
849
850 if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) {
851 pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR);
852 return -EIO;
853 }
854 ppdev_class = class_create(THIS_MODULE, CHRDEV);
855 if (IS_ERR(ppdev_class)) {
856 err = PTR_ERR(ppdev_class);
857 goto out_chrdev;
858 }
859 err = parport_register_driver(&pp_driver);
860 if (err < 0) {
861 pr_warn(CHRDEV ": unable to register with parport\n");
862 goto out_class;
863 }
864
865 pr_info(PP_VERSION "\n");
866 goto out;
867
868out_class:
869 class_destroy(ppdev_class);
870out_chrdev:
871 unregister_chrdev(PP_MAJOR, CHRDEV);
872out:
873 return err;
874}
875
876static void __exit ppdev_cleanup(void)
877{
878 /* Clean up all parport stuff */
879 parport_unregister_driver(&pp_driver);
880 class_destroy(ppdev_class);
881 unregister_chrdev(PP_MAJOR, CHRDEV);
882}
883
884module_init(ppdev_init);
885module_exit(ppdev_cleanup);
886
887MODULE_LICENSE("GPL");
888MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);