]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/char/ppdev.c
Merge branch 'turbostat' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux
[mirror_ubuntu-zesty-kernel.git] / drivers / char / ppdev.c
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.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
77 struct 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 };
88
89 /* should we use PARDEVICE_MAX here? */
90 static struct device *devices[PARPORT_MAX];
91
92 /* pp_struct.flags bitfields */
93 #define PP_CLAIMED (1<<0)
94 #define PP_EXCL (1<<1)
95
96 /* Other constants */
97 #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */
98 #define PP_BUFFER_SIZE 1024
99 #define PARDEVICE_MAX 8
100
101 /* ROUND_UP macro from fs/select.c */
102 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
103
104 static 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
112 static 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
119 static 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
197 static 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
274 static 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
287 static 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
294 name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor);
295 if (name == NULL)
296 return -ENOMEM;
297
298 port = parport_find_number(minor);
299 if (!port) {
300 pr_warn("%s: no associated port!\n", name);
301 kfree(name);
302 return -ENXIO;
303 }
304
305 memset(&ppdev_cb, 0, sizeof(ppdev_cb));
306 ppdev_cb.irq_func = pp_irq;
307 ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
308 ppdev_cb.private = pp;
309 pdev = parport_register_dev_model(port, name, &ppdev_cb, minor);
310 parport_put_port(port);
311 kfree(name);
312
313 if (!pdev) {
314 pr_warn("%s: failed to register device!\n", name);
315 return -ENXIO;
316 }
317
318 pp->pdev = pdev;
319 dev_dbg(&pdev->dev, "registered pardevice\n");
320 return 0;
321 }
322
323 static enum ieee1284_phase init_phase(int mode)
324 {
325 switch (mode & ~(IEEE1284_DEVICEID
326 | IEEE1284_ADDR)) {
327 case IEEE1284_MODE_NIBBLE:
328 case IEEE1284_MODE_BYTE:
329 return IEEE1284_PH_REV_IDLE;
330 }
331 return IEEE1284_PH_FWD_IDLE;
332 }
333
334 static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec)
335 {
336 long to_jiffies;
337
338 if ((tv_sec < 0) || (tv_usec < 0))
339 return -EINVAL;
340
341 to_jiffies = usecs_to_jiffies(tv_usec);
342 to_jiffies += tv_sec * HZ;
343 if (to_jiffies <= 0)
344 return -EINVAL;
345
346 pdev->timeout = to_jiffies;
347 return 0;
348 }
349
350 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
351 {
352 unsigned int minor = iminor(file_inode(file));
353 struct pp_struct *pp = file->private_data;
354 struct parport *port;
355 void __user *argp = (void __user *)arg;
356
357 /* First handle the cases that don't take arguments. */
358 switch (cmd) {
359 case PPCLAIM:
360 {
361 struct ieee1284_info *info;
362 int ret;
363
364 if (pp->flags & PP_CLAIMED) {
365 dev_dbg(&pp->pdev->dev, "you've already got it!\n");
366 return -EINVAL;
367 }
368
369 /* Deferred device registration. */
370 if (!pp->pdev) {
371 int err = register_device(minor, pp);
372
373 if (err)
374 return err;
375 }
376
377 ret = parport_claim_or_block(pp->pdev);
378 if (ret < 0)
379 return ret;
380
381 pp->flags |= PP_CLAIMED;
382
383 /* For interrupt-reporting to work, we need to be
384 * informed of each interrupt. */
385 pp_enable_irq(pp);
386
387 /* We may need to fix up the state machine. */
388 info = &pp->pdev->port->ieee1284;
389 pp->saved_state.mode = info->mode;
390 pp->saved_state.phase = info->phase;
391 info->mode = pp->state.mode;
392 info->phase = pp->state.phase;
393 pp->default_inactivity = parport_set_timeout(pp->pdev, 0);
394 parport_set_timeout(pp->pdev, pp->default_inactivity);
395
396 return 0;
397 }
398 case PPEXCL:
399 if (pp->pdev) {
400 dev_dbg(&pp->pdev->dev,
401 "too late for PPEXCL; already registered\n");
402 if (pp->flags & PP_EXCL)
403 /* But it's not really an error. */
404 return 0;
405 /* There's no chance of making the driver happy. */
406 return -EINVAL;
407 }
408
409 /* Just remember to register the device exclusively
410 * when we finally do the registration. */
411 pp->flags |= PP_EXCL;
412 return 0;
413 case PPSETMODE:
414 {
415 int mode;
416
417 if (copy_from_user(&mode, argp, sizeof(mode)))
418 return -EFAULT;
419 /* FIXME: validate mode */
420 pp->state.mode = mode;
421 pp->state.phase = init_phase(mode);
422
423 if (pp->flags & PP_CLAIMED) {
424 pp->pdev->port->ieee1284.mode = mode;
425 pp->pdev->port->ieee1284.phase = pp->state.phase;
426 }
427
428 return 0;
429 }
430 case PPGETMODE:
431 {
432 int mode;
433
434 if (pp->flags & PP_CLAIMED)
435 mode = pp->pdev->port->ieee1284.mode;
436 else
437 mode = pp->state.mode;
438
439 if (copy_to_user(argp, &mode, sizeof(mode)))
440 return -EFAULT;
441 return 0;
442 }
443 case PPSETPHASE:
444 {
445 int phase;
446
447 if (copy_from_user(&phase, argp, sizeof(phase)))
448 return -EFAULT;
449
450 /* FIXME: validate phase */
451 pp->state.phase = phase;
452
453 if (pp->flags & PP_CLAIMED)
454 pp->pdev->port->ieee1284.phase = phase;
455
456 return 0;
457 }
458 case PPGETPHASE:
459 {
460 int phase;
461
462 if (pp->flags & PP_CLAIMED)
463 phase = pp->pdev->port->ieee1284.phase;
464 else
465 phase = pp->state.phase;
466 if (copy_to_user(argp, &phase, sizeof(phase)))
467 return -EFAULT;
468 return 0;
469 }
470 case PPGETMODES:
471 {
472 unsigned int modes;
473
474 port = parport_find_number(minor);
475 if (!port)
476 return -ENODEV;
477
478 modes = port->modes;
479 parport_put_port(port);
480 if (copy_to_user(argp, &modes, sizeof(modes)))
481 return -EFAULT;
482 return 0;
483 }
484 case PPSETFLAGS:
485 {
486 int uflags;
487
488 if (copy_from_user(&uflags, argp, sizeof(uflags)))
489 return -EFAULT;
490 pp->flags &= ~PP_FLAGMASK;
491 pp->flags |= (uflags & PP_FLAGMASK);
492 return 0;
493 }
494 case PPGETFLAGS:
495 {
496 int uflags;
497
498 uflags = pp->flags & PP_FLAGMASK;
499 if (copy_to_user(argp, &uflags, sizeof(uflags)))
500 return -EFAULT;
501 return 0;
502 }
503 } /* end switch() */
504
505 /* Everything else requires the port to be claimed, so check
506 * that now. */
507 if ((pp->flags & PP_CLAIMED) == 0) {
508 pr_debug(CHRDEV "%x: claim the port first\n", minor);
509 return -EINVAL;
510 }
511
512 port = pp->pdev->port;
513 switch (cmd) {
514 struct ieee1284_info *info;
515 unsigned char reg;
516 unsigned char mask;
517 int mode;
518 s32 time32[2];
519 s64 time64[2];
520 struct timespec64 ts;
521 int ret;
522
523 case PPRSTATUS:
524 reg = parport_read_status(port);
525 if (copy_to_user(argp, &reg, sizeof(reg)))
526 return -EFAULT;
527 return 0;
528 case PPRDATA:
529 reg = parport_read_data(port);
530 if (copy_to_user(argp, &reg, sizeof(reg)))
531 return -EFAULT;
532 return 0;
533 case PPRCONTROL:
534 reg = parport_read_control(port);
535 if (copy_to_user(argp, &reg, sizeof(reg)))
536 return -EFAULT;
537 return 0;
538 case PPYIELD:
539 parport_yield_blocking(pp->pdev);
540 return 0;
541
542 case PPRELEASE:
543 /* Save the state machine's state. */
544 info = &pp->pdev->port->ieee1284;
545 pp->state.mode = info->mode;
546 pp->state.phase = info->phase;
547 info->mode = pp->saved_state.mode;
548 info->phase = pp->saved_state.phase;
549 parport_release(pp->pdev);
550 pp->flags &= ~PP_CLAIMED;
551 return 0;
552
553 case PPWCONTROL:
554 if (copy_from_user(&reg, argp, sizeof(reg)))
555 return -EFAULT;
556 parport_write_control(port, reg);
557 return 0;
558
559 case PPWDATA:
560 if (copy_from_user(&reg, argp, sizeof(reg)))
561 return -EFAULT;
562 parport_write_data(port, reg);
563 return 0;
564
565 case PPFCONTROL:
566 if (copy_from_user(&mask, argp,
567 sizeof(mask)))
568 return -EFAULT;
569 if (copy_from_user(&reg, 1 + (unsigned char __user *) arg,
570 sizeof(reg)))
571 return -EFAULT;
572 parport_frob_control(port, mask, reg);
573 return 0;
574
575 case PPDATADIR:
576 if (copy_from_user(&mode, argp, sizeof(mode)))
577 return -EFAULT;
578 if (mode)
579 port->ops->data_reverse(port);
580 else
581 port->ops->data_forward(port);
582 return 0;
583
584 case PPNEGOT:
585 if (copy_from_user(&mode, argp, sizeof(mode)))
586 return -EFAULT;
587 switch ((ret = parport_negotiate(port, mode))) {
588 case 0: break;
589 case -1: /* handshake failed, peripheral not IEEE 1284 */
590 ret = -EIO;
591 break;
592 case 1: /* handshake succeeded, peripheral rejected mode */
593 ret = -ENXIO;
594 break;
595 }
596 pp_enable_irq(pp);
597 return ret;
598
599 case PPWCTLONIRQ:
600 if (copy_from_user(&reg, argp, sizeof(reg)))
601 return -EFAULT;
602
603 /* Remember what to set the control lines to, for next
604 * time we get an interrupt. */
605 pp->irqctl = reg;
606 pp->irqresponse = 1;
607 return 0;
608
609 case PPCLRIRQ:
610 ret = atomic_read(&pp->irqc);
611 if (copy_to_user(argp, &ret, sizeof(ret)))
612 return -EFAULT;
613 atomic_sub(ret, &pp->irqc);
614 return 0;
615
616 case PPSETTIME32:
617 if (copy_from_user(time32, argp, sizeof(time32)))
618 return -EFAULT;
619
620 return pp_set_timeout(pp->pdev, time32[0], time32[1]);
621
622 case PPSETTIME64:
623 if (copy_from_user(time64, argp, sizeof(time64)))
624 return -EFAULT;
625
626 return pp_set_timeout(pp->pdev, time64[0], time64[1]);
627
628 case PPGETTIME32:
629 jiffies_to_timespec64(pp->pdev->timeout, &ts);
630 time32[0] = ts.tv_sec;
631 time32[1] = ts.tv_nsec / NSEC_PER_USEC;
632 if ((time32[0] < 0) || (time32[1] < 0))
633 return -EINVAL;
634
635 if (copy_to_user(argp, time32, sizeof(time32)))
636 return -EFAULT;
637
638 return 0;
639
640 case PPGETTIME64:
641 jiffies_to_timespec64(pp->pdev->timeout, &ts);
642 time64[0] = ts.tv_sec;
643 time64[1] = ts.tv_nsec / NSEC_PER_USEC;
644 if ((time64[0] < 0) || (time64[1] < 0))
645 return -EINVAL;
646
647 if (copy_to_user(argp, time64, sizeof(time64)))
648 return -EFAULT;
649
650 return 0;
651
652 default:
653 dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd);
654 return -EINVAL;
655 }
656
657 /* Keep the compiler happy */
658 return 0;
659 }
660
661 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
662 {
663 long ret;
664
665 mutex_lock(&pp_do_mutex);
666 ret = pp_do_ioctl(file, cmd, arg);
667 mutex_unlock(&pp_do_mutex);
668 return ret;
669 }
670
671 #ifdef CONFIG_COMPAT
672 static long pp_compat_ioctl(struct file *file, unsigned int cmd,
673 unsigned long arg)
674 {
675 return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
676 }
677 #endif
678
679 static int pp_open(struct inode *inode, struct file *file)
680 {
681 unsigned int minor = iminor(inode);
682 struct pp_struct *pp;
683
684 if (minor >= PARPORT_MAX)
685 return -ENXIO;
686
687 pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL);
688 if (!pp)
689 return -ENOMEM;
690
691 pp->state.mode = IEEE1284_MODE_COMPAT;
692 pp->state.phase = init_phase(pp->state.mode);
693 pp->flags = 0;
694 pp->irqresponse = 0;
695 atomic_set(&pp->irqc, 0);
696 init_waitqueue_head(&pp->irq_wait);
697
698 /* Defer the actual device registration until the first claim.
699 * That way, we know whether or not the driver wants to have
700 * exclusive access to the port (PPEXCL).
701 */
702 pp->pdev = NULL;
703 file->private_data = pp;
704
705 return 0;
706 }
707
708 static int pp_release(struct inode *inode, struct file *file)
709 {
710 unsigned int minor = iminor(inode);
711 struct pp_struct *pp = file->private_data;
712 int compat_negot;
713
714 compat_negot = 0;
715 if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
716 (pp->state.mode != IEEE1284_MODE_COMPAT)) {
717 struct ieee1284_info *info;
718
719 /* parport released, but not in compatibility mode */
720 parport_claim_or_block(pp->pdev);
721 pp->flags |= PP_CLAIMED;
722 info = &pp->pdev->port->ieee1284;
723 pp->saved_state.mode = info->mode;
724 pp->saved_state.phase = info->phase;
725 info->mode = pp->state.mode;
726 info->phase = pp->state.phase;
727 compat_negot = 1;
728 } else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
729 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
730 compat_negot = 2;
731 }
732 if (compat_negot) {
733 parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT);
734 dev_dbg(&pp->pdev->dev,
735 "negotiated back to compatibility mode because user-space forgot\n");
736 }
737
738 if (pp->flags & PP_CLAIMED) {
739 struct ieee1284_info *info;
740
741 info = &pp->pdev->port->ieee1284;
742 pp->state.mode = info->mode;
743 pp->state.phase = info->phase;
744 info->mode = pp->saved_state.mode;
745 info->phase = pp->saved_state.phase;
746 parport_release(pp->pdev);
747 if (compat_negot != 1) {
748 pr_debug(CHRDEV "%x: released pardevice "
749 "because user-space forgot\n", minor);
750 }
751 }
752
753 if (pp->pdev) {
754 parport_unregister_device(pp->pdev);
755 pp->pdev = NULL;
756 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor);
757 }
758
759 kfree(pp);
760
761 return 0;
762 }
763
764 /* No kernel lock held - fine */
765 static unsigned int pp_poll(struct file *file, poll_table *wait)
766 {
767 struct pp_struct *pp = file->private_data;
768 unsigned int mask = 0;
769
770 poll_wait(file, &pp->irq_wait, wait);
771 if (atomic_read(&pp->irqc))
772 mask |= POLLIN | POLLRDNORM;
773
774 return mask;
775 }
776
777 static struct class *ppdev_class;
778
779 static const struct file_operations pp_fops = {
780 .owner = THIS_MODULE,
781 .llseek = no_llseek,
782 .read = pp_read,
783 .write = pp_write,
784 .poll = pp_poll,
785 .unlocked_ioctl = pp_ioctl,
786 #ifdef CONFIG_COMPAT
787 .compat_ioctl = pp_compat_ioctl,
788 #endif
789 .open = pp_open,
790 .release = pp_release,
791 };
792
793 static void pp_attach(struct parport *port)
794 {
795 struct device *ret;
796
797 if (devices[port->number])
798 return;
799
800 ret = device_create(ppdev_class, port->dev,
801 MKDEV(PP_MAJOR, port->number), NULL,
802 "parport%d", port->number);
803 if (IS_ERR(ret)) {
804 pr_err("Failed to create device parport%d\n",
805 port->number);
806 return;
807 }
808 devices[port->number] = ret;
809 }
810
811 static void pp_detach(struct parport *port)
812 {
813 if (!devices[port->number])
814 return;
815
816 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
817 devices[port->number] = NULL;
818 }
819
820 static int pp_probe(struct pardevice *par_dev)
821 {
822 struct device_driver *drv = par_dev->dev.driver;
823 int len = strlen(drv->name);
824
825 if (strncmp(par_dev->name, drv->name, len))
826 return -ENODEV;
827
828 return 0;
829 }
830
831 static struct parport_driver pp_driver = {
832 .name = CHRDEV,
833 .probe = pp_probe,
834 .match_port = pp_attach,
835 .detach = pp_detach,
836 .devmodel = true,
837 };
838
839 static int __init ppdev_init(void)
840 {
841 int err = 0;
842
843 if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) {
844 pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR);
845 return -EIO;
846 }
847 ppdev_class = class_create(THIS_MODULE, CHRDEV);
848 if (IS_ERR(ppdev_class)) {
849 err = PTR_ERR(ppdev_class);
850 goto out_chrdev;
851 }
852 err = parport_register_driver(&pp_driver);
853 if (err < 0) {
854 pr_warn(CHRDEV ": unable to register with parport\n");
855 goto out_class;
856 }
857
858 pr_info(PP_VERSION "\n");
859 goto out;
860
861 out_class:
862 class_destroy(ppdev_class);
863 out_chrdev:
864 unregister_chrdev(PP_MAJOR, CHRDEV);
865 out:
866 return err;
867 }
868
869 static void __exit ppdev_cleanup(void)
870 {
871 /* Clean up all parport stuff */
872 parport_unregister_driver(&pp_driver);
873 class_destroy(ppdev_class);
874 unregister_chrdev(PP_MAJOR, CHRDEV);
875 }
876
877 module_init(ppdev_init);
878 module_exit(ppdev_cleanup);
879
880 MODULE_LICENSE("GPL");
881 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);