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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/major.h>
68#include <linux/ppdev.h>
69#include <asm/uaccess.h>
70
71#define PP_VERSION "ppdev: user-space parallel port driver"
72#define CHRDEV "ppdev"
73
74struct pp_struct {
75 struct pardevice * pdev;
76 wait_queue_head_t irq_wait;
77 atomic_t irqc;
78 unsigned int flags;
79 int irqresponse;
80 unsigned char irqctl;
81 struct ieee1284_info state;
82 struct ieee1284_info saved_state;
83 long default_inactivity;
84};
85
86
87#define PP_CLAIMED (1<<0)
88#define PP_EXCL (1<<1)
89
90
91#define PP_INTERRUPT_TIMEOUT (10 * HZ)
92#define PP_BUFFER_SIZE 1024
93#define PARDEVICE_MAX 8
94
95
96#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
97
98static inline void pp_enable_irq (struct pp_struct *pp)
99{
100 struct parport *port = pp->pdev->port;
101 port->ops->enable_irq (port);
102}
103
104static ssize_t pp_read (struct file * file, char __user * buf, size_t count,
105 loff_t * ppos)
106{
107 unsigned int minor = iminor(file->f_path.dentry->d_inode);
108 struct pp_struct *pp = file->private_data;
109 char * kbuffer;
110 ssize_t bytes_read = 0;
111 struct parport *pport;
112 int mode;
113
114 if (!(pp->flags & PP_CLAIMED)) {
115
116 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
117 minor);
118 return -EINVAL;
119 }
120
121
122 if (count == 0)
123 return 0;
124
125 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
126 if (!kbuffer) {
127 return -ENOMEM;
128 }
129 pport = pp->pdev->port;
130 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
131
132 parport_set_timeout (pp->pdev,
133 (file->f_flags & O_NONBLOCK) ?
134 PARPORT_INACTIVITY_O_NONBLOCK :
135 pp->default_inactivity);
136
137 while (bytes_read == 0) {
138 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE);
139
140 if (mode == IEEE1284_MODE_EPP) {
141
142 int flags = 0;
143 size_t (*fn)(struct parport *, void *, size_t, int);
144
145 if (pp->flags & PP_W91284PIC) {
146 flags |= PARPORT_W91284PIC;
147 }
148 if (pp->flags & PP_FASTREAD) {
149 flags |= PARPORT_EPP_FAST;
150 }
151 if (pport->ieee1284.mode & IEEE1284_ADDR) {
152 fn = pport->ops->epp_read_addr;
153 } else {
154 fn = pport->ops->epp_read_data;
155 }
156 bytes_read = (*fn)(pport, kbuffer, need, flags);
157 } else {
158 bytes_read = parport_read (pport, kbuffer, need);
159 }
160
161 if (bytes_read != 0)
162 break;
163
164 if (file->f_flags & O_NONBLOCK) {
165 bytes_read = -EAGAIN;
166 break;
167 }
168
169 if (signal_pending (current)) {
170 bytes_read = -ERESTARTSYS;
171 break;
172 }
173
174 cond_resched();
175 }
176
177 parport_set_timeout (pp->pdev, pp->default_inactivity);
178
179 if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read))
180 bytes_read = -EFAULT;
181
182 kfree (kbuffer);
183 pp_enable_irq (pp);
184 return bytes_read;
185}
186
187static ssize_t pp_write (struct file * file, const char __user * buf,
188 size_t count, loff_t * ppos)
189{
190 unsigned int minor = iminor(file->f_path.dentry->d_inode);
191 struct pp_struct *pp = file->private_data;
192 char * kbuffer;
193 ssize_t bytes_written = 0;
194 ssize_t wrote;
195 int mode;
196 struct parport *pport;
197
198 if (!(pp->flags & PP_CLAIMED)) {
199
200 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
201 minor);
202 return -EINVAL;
203 }
204
205 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
206 if (!kbuffer) {
207 return -ENOMEM;
208 }
209 pport = pp->pdev->port;
210 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
211
212 parport_set_timeout (pp->pdev,
213 (file->f_flags & O_NONBLOCK) ?
214 PARPORT_INACTIVITY_O_NONBLOCK :
215 pp->default_inactivity);
216
217 while (bytes_written < count) {
218 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE);
219
220 if (copy_from_user (kbuffer, buf + bytes_written, n)) {
221 bytes_written = -EFAULT;
222 break;
223 }
224
225 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) {
226
227 if (pport->ieee1284.mode & IEEE1284_ADDR) {
228 wrote = pport->ops->epp_write_addr (pport,
229 kbuffer, n, PARPORT_EPP_FAST);
230 } else {
231 wrote = pport->ops->epp_write_data (pport,
232 kbuffer, n, PARPORT_EPP_FAST);
233 }
234 } else {
235 wrote = parport_write (pp->pdev->port, kbuffer, n);
236 }
237
238 if (wrote <= 0) {
239 if (!bytes_written) {
240 bytes_written = wrote;
241 }
242 break;
243 }
244
245 bytes_written += wrote;
246
247 if (file->f_flags & O_NONBLOCK) {
248 if (!bytes_written)
249 bytes_written = -EAGAIN;
250 break;
251 }
252
253 if (signal_pending (current)) {
254 if (!bytes_written) {
255 bytes_written = -EINTR;
256 }
257 break;
258 }
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 int fl;
289
290 name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL);
291 if (name == NULL)
292 return -ENOMEM;
293
294 sprintf (name, CHRDEV "%x", minor);
295
296 port = parport_find_number (minor);
297 if (!port) {
298 printk (KERN_WARNING "%s: no associated port!\n", name);
299 kfree (name);
300 return -ENXIO;
301 }
302
303 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
304 pdev = parport_register_device (port, name, NULL,
305 NULL, pp_irq, fl, pp);
306 parport_put_port (port);
307
308 if (!pdev) {
309 printk (KERN_WARNING "%s: failed to register device!\n", name);
310 kfree (name);
311 return -ENXIO;
312 }
313
314 pp->pdev = pdev;
315 printk (KERN_DEBUG "%s: registered pardevice\n", name);
316 return 0;
317}
318
319static enum ieee1284_phase init_phase (int mode)
320{
321 switch (mode & ~(IEEE1284_DEVICEID
322 | IEEE1284_ADDR)) {
323 case IEEE1284_MODE_NIBBLE:
324 case IEEE1284_MODE_BYTE:
325 return IEEE1284_PH_REV_IDLE;
326 }
327 return IEEE1284_PH_FWD_IDLE;
328}
329
330static int pp_ioctl(struct inode *inode, struct file *file,
331 unsigned int cmd, unsigned long arg)
332{
333 unsigned int minor = iminor(inode);
334 struct pp_struct *pp = file->private_data;
335 struct parport * port;
336 void __user *argp = (void __user *)arg;
337
338
339 switch (cmd) {
340 case PPCLAIM:
341 {
342 struct ieee1284_info *info;
343 int ret;
344
345 if (pp->flags & PP_CLAIMED) {
346 printk (KERN_DEBUG CHRDEV
347 "%x: you've already got it!\n", minor);
348 return -EINVAL;
349 }
350
351
352 if (!pp->pdev) {
353 int err = register_device (minor, pp);
354 if (err) {
355 return err;
356 }
357 }
358
359 ret = parport_claim_or_block (pp->pdev);
360 if (ret < 0)
361 return ret;
362
363 pp->flags |= PP_CLAIMED;
364
365
366
367 pp_enable_irq (pp);
368
369
370 info = &pp->pdev->port->ieee1284;
371 pp->saved_state.mode = info->mode;
372 pp->saved_state.phase = info->phase;
373 info->mode = pp->state.mode;
374 info->phase = pp->state.phase;
375 pp->default_inactivity = parport_set_timeout (pp->pdev, 0);
376 parport_set_timeout (pp->pdev, pp->default_inactivity);
377
378 return 0;
379 }
380 case PPEXCL:
381 if (pp->pdev) {
382 printk (KERN_DEBUG CHRDEV "%x: too late for PPEXCL; "
383 "already registered\n", minor);
384 if (pp->flags & PP_EXCL)
385
386 return 0;
387
388 return -EINVAL;
389 }
390
391
392
393 pp->flags |= PP_EXCL;
394 return 0;
395 case PPSETMODE:
396 {
397 int mode;
398 if (copy_from_user (&mode, argp, sizeof (mode)))
399 return -EFAULT;
400
401 pp->state.mode = mode;
402 pp->state.phase = init_phase (mode);
403
404 if (pp->flags & PP_CLAIMED) {
405 pp->pdev->port->ieee1284.mode = mode;
406 pp->pdev->port->ieee1284.phase = pp->state.phase;
407 }
408
409 return 0;
410 }
411 case PPGETMODE:
412 {
413 int mode;
414
415 if (pp->flags & PP_CLAIMED) {
416 mode = pp->pdev->port->ieee1284.mode;
417 } else {
418 mode = pp->state.mode;
419 }
420 if (copy_to_user (argp, &mode, sizeof (mode))) {
421 return -EFAULT;
422 }
423 return 0;
424 }
425 case PPSETPHASE:
426 {
427 int phase;
428 if (copy_from_user (&phase, argp, sizeof (phase))) {
429 return -EFAULT;
430 }
431
432 pp->state.phase = phase;
433
434 if (pp->flags & PP_CLAIMED) {
435 pp->pdev->port->ieee1284.phase = phase;
436 }
437
438 return 0;
439 }
440 case PPGETPHASE:
441 {
442 int phase;
443
444 if (pp->flags & PP_CLAIMED) {
445 phase = pp->pdev->port->ieee1284.phase;
446 } else {
447 phase = pp->state.phase;
448 }
449 if (copy_to_user (argp, &phase, sizeof (phase))) {
450 return -EFAULT;
451 }
452 return 0;
453 }
454 case PPGETMODES:
455 {
456 unsigned int modes;
457
458 port = parport_find_number (minor);
459 if (!port)
460 return -ENODEV;
461
462 modes = port->modes;
463 if (copy_to_user (argp, &modes, sizeof (modes))) {
464 return -EFAULT;
465 }
466 return 0;
467 }
468 case PPSETFLAGS:
469 {
470 int uflags;
471
472 if (copy_from_user (&uflags, argp, sizeof (uflags))) {
473 return -EFAULT;
474 }
475 pp->flags &= ~PP_FLAGMASK;
476 pp->flags |= (uflags & PP_FLAGMASK);
477 return 0;
478 }
479 case PPGETFLAGS:
480 {
481 int uflags;
482
483 uflags = pp->flags & PP_FLAGMASK;
484 if (copy_to_user (argp, &uflags, sizeof (uflags))) {
485 return -EFAULT;
486 }
487 return 0;
488 }
489 }
490
491
492
493 if ((pp->flags & PP_CLAIMED) == 0) {
494 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
495 minor);
496 return -EINVAL;
497 }
498
499 port = pp->pdev->port;
500 switch (cmd) {
501 struct ieee1284_info *info;
502 unsigned char reg;
503 unsigned char mask;
504 int mode;
505 int ret;
506 struct timeval par_timeout;
507 long to_jiffies;
508
509 case PPRSTATUS:
510 reg = parport_read_status (port);
511 if (copy_to_user (argp, ®, sizeof (reg)))
512 return -EFAULT;
513 return 0;
514 case PPRDATA:
515 reg = parport_read_data (port);
516 if (copy_to_user (argp, ®, sizeof (reg)))
517 return -EFAULT;
518 return 0;
519 case PPRCONTROL:
520 reg = parport_read_control (port);
521 if (copy_to_user (argp, ®, sizeof (reg)))
522 return -EFAULT;
523 return 0;
524 case PPYIELD:
525 parport_yield_blocking (pp->pdev);
526 return 0;
527
528 case PPRELEASE:
529
530 info = &pp->pdev->port->ieee1284;
531 pp->state.mode = info->mode;
532 pp->state.phase = info->phase;
533 info->mode = pp->saved_state.mode;
534 info->phase = pp->saved_state.phase;
535 parport_release (pp->pdev);
536 pp->flags &= ~PP_CLAIMED;
537 return 0;
538
539 case PPWCONTROL:
540 if (copy_from_user (®, argp, sizeof (reg)))
541 return -EFAULT;
542 parport_write_control (port, reg);
543 return 0;
544
545 case PPWDATA:
546 if (copy_from_user (®, argp, sizeof (reg)))
547 return -EFAULT;
548 parport_write_data (port, reg);
549 return 0;
550
551 case PPFCONTROL:
552 if (copy_from_user (&mask, argp,
553 sizeof (mask)))
554 return -EFAULT;
555 if (copy_from_user (®, 1 + (unsigned char __user *) arg,
556 sizeof (reg)))
557 return -EFAULT;
558 parport_frob_control (port, mask, reg);
559 return 0;
560
561 case PPDATADIR:
562 if (copy_from_user (&mode, argp, sizeof (mode)))
563 return -EFAULT;
564 if (mode)
565 port->ops->data_reverse (port);
566 else
567 port->ops->data_forward (port);
568 return 0;
569
570 case PPNEGOT:
571 if (copy_from_user (&mode, argp, sizeof (mode)))
572 return -EFAULT;
573 switch ((ret = parport_negotiate (port, mode))) {
574 case 0: break;
575 case -1:
576 ret = -EIO;
577 break;
578 case 1:
579 ret = -ENXIO;
580 break;
581 }
582 pp_enable_irq (pp);
583 return ret;
584
585 case PPWCTLONIRQ:
586 if (copy_from_user (®, argp, sizeof (reg)))
587 return -EFAULT;
588
589
590
591 pp->irqctl = reg;
592 pp->irqresponse = 1;
593 return 0;
594
595 case PPCLRIRQ:
596 ret = atomic_read (&pp->irqc);
597 if (copy_to_user (argp, &ret, sizeof (ret)))
598 return -EFAULT;
599 atomic_sub (ret, &pp->irqc);
600 return 0;
601
602 case PPSETTIME:
603 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) {
604 return -EFAULT;
605 }
606
607 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) {
608 return -EINVAL;
609 }
610 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
611 to_jiffies += par_timeout.tv_sec * (long)HZ;
612 if (to_jiffies <= 0) {
613 return -EINVAL;
614 }
615 pp->pdev->timeout = to_jiffies;
616 return 0;
617
618 case PPGETTIME:
619 to_jiffies = pp->pdev->timeout;
620 par_timeout.tv_sec = to_jiffies / HZ;
621 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ);
622 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval)))
623 return -EFAULT;
624 return 0;
625
626 default:
627 printk (KERN_DEBUG CHRDEV "%x: What? (cmd=0x%x)\n", minor,
628 cmd);
629 return -EINVAL;
630 }
631
632
633 return 0;
634}
635
636static int pp_open (struct inode * inode, struct file * file)
637{
638 unsigned int minor = iminor(inode);
639 struct pp_struct *pp;
640
641 if (minor >= PARPORT_MAX)
642 return -ENXIO;
643
644 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL);
645 if (!pp)
646 return -ENOMEM;
647
648 pp->state.mode = IEEE1284_MODE_COMPAT;
649 pp->state.phase = init_phase (pp->state.mode);
650 pp->flags = 0;
651 pp->irqresponse = 0;
652 atomic_set (&pp->irqc, 0);
653 init_waitqueue_head (&pp->irq_wait);
654
655
656
657
658
659 pp->pdev = NULL;
660 file->private_data = pp;
661
662 return 0;
663}
664
665static int pp_release (struct inode * inode, struct file * file)
666{
667 unsigned int minor = iminor(inode);
668 struct pp_struct *pp = file->private_data;
669 int compat_negot;
670
671 compat_negot = 0;
672 if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
673 (pp->state.mode != IEEE1284_MODE_COMPAT)) {
674 struct ieee1284_info *info;
675
676
677 parport_claim_or_block (pp->pdev);
678 pp->flags |= PP_CLAIMED;
679 info = &pp->pdev->port->ieee1284;
680 pp->saved_state.mode = info->mode;
681 pp->saved_state.phase = info->phase;
682 info->mode = pp->state.mode;
683 info->phase = pp->state.phase;
684 compat_negot = 1;
685 } else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
686 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
687 compat_negot = 2;
688 }
689 if (compat_negot) {
690 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT);
691 printk (KERN_DEBUG CHRDEV
692 "%x: negotiated back to compatibility mode because "
693 "user-space forgot\n", minor);
694 }
695
696 if (pp->flags & PP_CLAIMED) {
697 struct ieee1284_info *info;
698
699 info = &pp->pdev->port->ieee1284;
700 pp->state.mode = info->mode;
701 pp->state.phase = info->phase;
702 info->mode = pp->saved_state.mode;
703 info->phase = pp->saved_state.phase;
704 parport_release (pp->pdev);
705 if (compat_negot != 1) {
706 printk (KERN_DEBUG CHRDEV "%x: released pardevice "
707 "because user-space forgot\n", minor);
708 }
709 }
710
711 if (pp->pdev) {
712 const char *name = pp->pdev->name;
713 parport_unregister_device (pp->pdev);
714 kfree (name);
715 pp->pdev = NULL;
716 printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n",
717 minor);
718 }
719
720 kfree (pp);
721
722 return 0;
723}
724
725
726static unsigned int pp_poll (struct file * file, poll_table * wait)
727{
728 struct pp_struct *pp = file->private_data;
729 unsigned int mask = 0;
730
731 poll_wait (file, &pp->irq_wait, wait);
732 if (atomic_read (&pp->irqc))
733 mask |= POLLIN | POLLRDNORM;
734
735 return mask;
736}
737
738static struct class *ppdev_class;
739
740static const struct file_operations pp_fops = {
741 .owner = THIS_MODULE,
742 .llseek = no_llseek,
743 .read = pp_read,
744 .write = pp_write,
745 .poll = pp_poll,
746 .ioctl = pp_ioctl,
747 .open = pp_open,
748 .release = pp_release,
749};
750
751static void pp_attach(struct parport *port)
752{
753 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number),
754 "parport%d", port->number);
755}
756
757static void pp_detach(struct parport *port)
758{
759 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
760}
761
762static struct parport_driver pp_driver = {
763 .name = CHRDEV,
764 .attach = pp_attach,
765 .detach = pp_detach,
766};
767
768static int __init ppdev_init (void)
769{
770 int err = 0;
771
772 if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) {
773 printk (KERN_WARNING CHRDEV ": unable to get major %d\n",
774 PP_MAJOR);
775 return -EIO;
776 }
777 ppdev_class = class_create(THIS_MODULE, CHRDEV);
778 if (IS_ERR(ppdev_class)) {
779 err = PTR_ERR(ppdev_class);
780 goto out_chrdev;
781 }
782 if (parport_register_driver(&pp_driver)) {
783 printk (KERN_WARNING CHRDEV ": unable to register with parport\n");
784 goto out_class;
785 }
786
787 printk (KERN_INFO PP_VERSION "\n");
788 goto out;
789
790out_class:
791 class_destroy(ppdev_class);
792out_chrdev:
793 unregister_chrdev(PP_MAJOR, CHRDEV);
794out:
795 return err;
796}
797
798static void __exit ppdev_cleanup (void)
799{
800
801 parport_unregister_driver(&pp_driver);
802 class_destroy(ppdev_class);
803 unregister_chrdev (PP_MAJOR, CHRDEV);
804}
805
806module_init(ppdev_init);
807module_exit(ppdev_cleanup);
808
809MODULE_LICENSE("GPL");
810MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);
811
