Commit | Line | Data |
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1da177e4 LT |
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/devfs_fs_kernel.h> | |
64 | #include <linux/ioctl.h> | |
65 | #include <linux/parport.h> | |
66 | #include <linux/ctype.h> | |
67 | #include <linux/poll.h> | |
68 | #include <asm/uaccess.h> | |
69 | #include <linux/ppdev.h> | |
70 | #include <linux/smp_lock.h> | |
71 | #include <linux/device.h> | |
72 | ||
73 | #define PP_VERSION "ppdev: user-space parallel port driver" | |
74 | #define CHRDEV "ppdev" | |
75 | ||
76 | struct pp_struct { | |
77 | struct pardevice * pdev; | |
78 | wait_queue_head_t irq_wait; | |
79 | atomic_t irqc; | |
80 | unsigned int flags; | |
81 | int irqresponse; | |
82 | unsigned char irqctl; | |
83 | struct ieee1284_info state; | |
84 | struct ieee1284_info saved_state; | |
85 | long default_inactivity; | |
86 | }; | |
87 | ||
88 | /* pp_struct.flags bitfields */ | |
89 | #define PP_CLAIMED (1<<0) | |
90 | #define PP_EXCL (1<<1) | |
91 | ||
92 | /* Other constants */ | |
93 | #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ | |
94 | #define PP_BUFFER_SIZE 1024 | |
95 | #define PARDEVICE_MAX 8 | |
96 | ||
97 | /* ROUND_UP macro from fs/select.c */ | |
98 | #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) | |
99 | ||
100 | static inline void pp_enable_irq (struct pp_struct *pp) | |
101 | { | |
102 | struct parport *port = pp->pdev->port; | |
103 | port->ops->enable_irq (port); | |
104 | } | |
105 | ||
106 | static ssize_t pp_read (struct file * file, char __user * buf, size_t count, | |
107 | loff_t * ppos) | |
108 | { | |
109 | unsigned int minor = iminor(file->f_dentry->d_inode); | |
110 | struct pp_struct *pp = file->private_data; | |
111 | char * kbuffer; | |
112 | ssize_t bytes_read = 0; | |
113 | struct parport *pport; | |
114 | int mode; | |
115 | ||
116 | if (!(pp->flags & PP_CLAIMED)) { | |
117 | /* Don't have the port claimed */ | |
118 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", | |
119 | minor); | |
120 | return -EINVAL; | |
121 | } | |
122 | ||
123 | /* Trivial case. */ | |
124 | if (count == 0) | |
125 | return 0; | |
126 | ||
127 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
128 | if (!kbuffer) { | |
129 | return -ENOMEM; | |
130 | } | |
131 | pport = pp->pdev->port; | |
132 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
133 | ||
134 | parport_set_timeout (pp->pdev, | |
135 | (file->f_flags & O_NONBLOCK) ? | |
136 | PARPORT_INACTIVITY_O_NONBLOCK : | |
137 | pp->default_inactivity); | |
138 | ||
139 | while (bytes_read == 0) { | |
140 | ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); | |
141 | ||
142 | if (mode == IEEE1284_MODE_EPP) { | |
143 | /* various specials for EPP mode */ | |
144 | int flags = 0; | |
145 | size_t (*fn)(struct parport *, void *, size_t, int); | |
146 | ||
147 | if (pp->flags & PP_W91284PIC) { | |
148 | flags |= PARPORT_W91284PIC; | |
149 | } | |
150 | if (pp->flags & PP_FASTREAD) { | |
151 | flags |= PARPORT_EPP_FAST; | |
152 | } | |
153 | if (pport->ieee1284.mode & IEEE1284_ADDR) { | |
154 | fn = pport->ops->epp_read_addr; | |
155 | } else { | |
156 | fn = pport->ops->epp_read_data; | |
157 | } | |
158 | bytes_read = (*fn)(pport, kbuffer, need, flags); | |
159 | } else { | |
160 | bytes_read = parport_read (pport, kbuffer, need); | |
161 | } | |
162 | ||
163 | if (bytes_read != 0) | |
164 | break; | |
165 | ||
166 | if (file->f_flags & O_NONBLOCK) { | |
167 | bytes_read = -EAGAIN; | |
168 | break; | |
169 | } | |
170 | ||
171 | if (signal_pending (current)) { | |
172 | bytes_read = -ERESTARTSYS; | |
173 | break; | |
174 | } | |
175 | ||
176 | cond_resched(); | |
177 | } | |
178 | ||
179 | parport_set_timeout (pp->pdev, pp->default_inactivity); | |
180 | ||
181 | if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read)) | |
182 | bytes_read = -EFAULT; | |
183 | ||
184 | kfree (kbuffer); | |
185 | pp_enable_irq (pp); | |
186 | return bytes_read; | |
187 | } | |
188 | ||
189 | static ssize_t pp_write (struct file * file, const char __user * buf, | |
190 | size_t count, loff_t * ppos) | |
191 | { | |
192 | unsigned int minor = iminor(file->f_dentry->d_inode); | |
193 | struct pp_struct *pp = file->private_data; | |
194 | char * kbuffer; | |
195 | ssize_t bytes_written = 0; | |
196 | ssize_t wrote; | |
197 | int mode; | |
198 | struct parport *pport; | |
199 | ||
200 | if (!(pp->flags & PP_CLAIMED)) { | |
201 | /* Don't have the port claimed */ | |
202 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", | |
203 | minor); | |
204 | return -EINVAL; | |
205 | } | |
206 | ||
207 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
208 | if (!kbuffer) { | |
209 | return -ENOMEM; | |
210 | } | |
211 | pport = pp->pdev->port; | |
212 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
213 | ||
214 | parport_set_timeout (pp->pdev, | |
215 | (file->f_flags & O_NONBLOCK) ? | |
216 | PARPORT_INACTIVITY_O_NONBLOCK : | |
217 | pp->default_inactivity); | |
218 | ||
219 | while (bytes_written < count) { | |
220 | ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); | |
221 | ||
222 | if (copy_from_user (kbuffer, buf + bytes_written, n)) { | |
223 | bytes_written = -EFAULT; | |
224 | break; | |
225 | } | |
226 | ||
227 | if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { | |
228 | /* do a fast EPP write */ | |
229 | if (pport->ieee1284.mode & IEEE1284_ADDR) { | |
230 | wrote = pport->ops->epp_write_addr (pport, | |
231 | kbuffer, n, PARPORT_EPP_FAST); | |
232 | } else { | |
233 | wrote = pport->ops->epp_write_data (pport, | |
234 | kbuffer, n, PARPORT_EPP_FAST); | |
235 | } | |
236 | } else { | |
237 | wrote = parport_write (pp->pdev->port, kbuffer, n); | |
238 | } | |
239 | ||
240 | if (wrote <= 0) { | |
241 | if (!bytes_written) { | |
242 | bytes_written = wrote; | |
243 | } | |
244 | break; | |
245 | } | |
246 | ||
247 | bytes_written += wrote; | |
248 | ||
249 | if (file->f_flags & O_NONBLOCK) { | |
250 | if (!bytes_written) | |
251 | bytes_written = -EAGAIN; | |
252 | break; | |
253 | } | |
254 | ||
255 | if (signal_pending (current)) { | |
256 | if (!bytes_written) { | |
257 | bytes_written = -EINTR; | |
258 | } | |
259 | break; | |
260 | } | |
261 | ||
262 | cond_resched(); | |
263 | } | |
264 | ||
265 | parport_set_timeout (pp->pdev, pp->default_inactivity); | |
266 | ||
267 | kfree (kbuffer); | |
268 | pp_enable_irq (pp); | |
269 | return bytes_written; | |
270 | } | |
271 | ||
272 | static void pp_irq (int irq, void * private, struct pt_regs * unused) | |
273 | { | |
274 | struct pp_struct * pp = (struct pp_struct *) private; | |
275 | ||
276 | if (pp->irqresponse) { | |
277 | parport_write_control (pp->pdev->port, pp->irqctl); | |
278 | pp->irqresponse = 0; | |
279 | } | |
280 | ||
281 | atomic_inc (&pp->irqc); | |
282 | wake_up_interruptible (&pp->irq_wait); | |
283 | } | |
284 | ||
285 | static int register_device (int minor, struct pp_struct *pp) | |
286 | { | |
287 | struct parport *port; | |
288 | struct pardevice * pdev = NULL; | |
289 | char *name; | |
290 | int fl; | |
291 | ||
292 | name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL); | |
293 | if (name == NULL) | |
294 | return -ENOMEM; | |
295 | ||
296 | sprintf (name, CHRDEV "%x", minor); | |
297 | ||
298 | port = parport_find_number (minor); | |
299 | if (!port) { | |
300 | printk (KERN_WARNING "%s: no associated port!\n", name); | |
301 | kfree (name); | |
302 | return -ENXIO; | |
303 | } | |
304 | ||
305 | fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; | |
306 | pdev = parport_register_device (port, name, NULL, | |
307 | NULL, pp_irq, fl, pp); | |
308 | parport_put_port (port); | |
309 | ||
310 | if (!pdev) { | |
311 | printk (KERN_WARNING "%s: failed to register device!\n", name); | |
312 | kfree (name); | |
313 | return -ENXIO; | |
314 | } | |
315 | ||
316 | pp->pdev = pdev; | |
317 | printk (KERN_DEBUG "%s: registered pardevice\n", name); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static enum ieee1284_phase init_phase (int mode) | |
322 | { | |
323 | switch (mode & ~(IEEE1284_DEVICEID | |
324 | | IEEE1284_ADDR)) { | |
325 | case IEEE1284_MODE_NIBBLE: | |
326 | case IEEE1284_MODE_BYTE: | |
327 | return IEEE1284_PH_REV_IDLE; | |
328 | } | |
329 | return IEEE1284_PH_FWD_IDLE; | |
330 | } | |
331 | ||
332 | static int pp_ioctl(struct inode *inode, struct file *file, | |
333 | unsigned int cmd, unsigned long arg) | |
334 | { | |
335 | unsigned int minor = iminor(inode); | |
336 | struct pp_struct *pp = file->private_data; | |
337 | struct parport * port; | |
338 | void __user *argp = (void __user *)arg; | |
339 | ||
340 | /* First handle the cases that don't take arguments. */ | |
341 | switch (cmd) { | |
342 | case PPCLAIM: | |
343 | { | |
344 | struct ieee1284_info *info; | |
345 | int ret; | |
346 | ||
347 | if (pp->flags & PP_CLAIMED) { | |
348 | printk (KERN_DEBUG CHRDEV | |
349 | "%x: you've already got it!\n", minor); | |
350 | return -EINVAL; | |
351 | } | |
352 | ||
353 | /* Deferred device registration. */ | |
354 | if (!pp->pdev) { | |
355 | int err = register_device (minor, pp); | |
356 | if (err) { | |
357 | return err; | |
358 | } | |
359 | } | |
360 | ||
361 | ret = parport_claim_or_block (pp->pdev); | |
362 | if (ret < 0) | |
363 | return ret; | |
364 | ||
365 | pp->flags |= PP_CLAIMED; | |
366 | ||
367 | /* For interrupt-reporting to work, we need to be | |
368 | * informed of each interrupt. */ | |
369 | pp_enable_irq (pp); | |
370 | ||
371 | /* We may need to fix up the state machine. */ | |
372 | info = &pp->pdev->port->ieee1284; | |
373 | pp->saved_state.mode = info->mode; | |
374 | pp->saved_state.phase = info->phase; | |
375 | info->mode = pp->state.mode; | |
376 | info->phase = pp->state.phase; | |
377 | pp->default_inactivity = parport_set_timeout (pp->pdev, 0); | |
378 | parport_set_timeout (pp->pdev, pp->default_inactivity); | |
379 | ||
380 | return 0; | |
381 | } | |
382 | case PPEXCL: | |
383 | if (pp->pdev) { | |
384 | printk (KERN_DEBUG CHRDEV "%x: too late for PPEXCL; " | |
385 | "already registered\n", minor); | |
386 | if (pp->flags & PP_EXCL) | |
387 | /* But it's not really an error. */ | |
388 | return 0; | |
389 | /* There's no chance of making the driver happy. */ | |
390 | return -EINVAL; | |
391 | } | |
392 | ||
393 | /* Just remember to register the device exclusively | |
394 | * when we finally do the registration. */ | |
395 | pp->flags |= PP_EXCL; | |
396 | return 0; | |
397 | case PPSETMODE: | |
398 | { | |
399 | int mode; | |
400 | if (copy_from_user (&mode, argp, sizeof (mode))) | |
401 | return -EFAULT; | |
402 | /* FIXME: validate mode */ | |
403 | pp->state.mode = mode; | |
404 | pp->state.phase = init_phase (mode); | |
405 | ||
406 | if (pp->flags & PP_CLAIMED) { | |
407 | pp->pdev->port->ieee1284.mode = mode; | |
408 | pp->pdev->port->ieee1284.phase = pp->state.phase; | |
409 | } | |
410 | ||
411 | return 0; | |
412 | } | |
413 | case PPGETMODE: | |
414 | { | |
415 | int mode; | |
416 | ||
417 | if (pp->flags & PP_CLAIMED) { | |
418 | mode = pp->pdev->port->ieee1284.mode; | |
419 | } else { | |
420 | mode = pp->state.mode; | |
421 | } | |
422 | if (copy_to_user (argp, &mode, sizeof (mode))) { | |
423 | return -EFAULT; | |
424 | } | |
425 | return 0; | |
426 | } | |
427 | case PPSETPHASE: | |
428 | { | |
429 | int phase; | |
430 | if (copy_from_user (&phase, argp, sizeof (phase))) { | |
431 | return -EFAULT; | |
432 | } | |
433 | /* FIXME: validate phase */ | |
434 | pp->state.phase = phase; | |
435 | ||
436 | if (pp->flags & PP_CLAIMED) { | |
437 | pp->pdev->port->ieee1284.phase = phase; | |
438 | } | |
439 | ||
440 | return 0; | |
441 | } | |
442 | case PPGETPHASE: | |
443 | { | |
444 | int phase; | |
445 | ||
446 | if (pp->flags & PP_CLAIMED) { | |
447 | phase = pp->pdev->port->ieee1284.phase; | |
448 | } else { | |
449 | phase = pp->state.phase; | |
450 | } | |
451 | if (copy_to_user (argp, &phase, sizeof (phase))) { | |
452 | return -EFAULT; | |
453 | } | |
454 | return 0; | |
455 | } | |
456 | case PPGETMODES: | |
457 | { | |
458 | unsigned int modes; | |
459 | ||
460 | port = parport_find_number (minor); | |
461 | if (!port) | |
462 | return -ENODEV; | |
463 | ||
464 | modes = port->modes; | |
465 | if (copy_to_user (argp, &modes, sizeof (modes))) { | |
466 | return -EFAULT; | |
467 | } | |
468 | return 0; | |
469 | } | |
470 | case PPSETFLAGS: | |
471 | { | |
472 | int uflags; | |
473 | ||
474 | if (copy_from_user (&uflags, argp, sizeof (uflags))) { | |
475 | return -EFAULT; | |
476 | } | |
477 | pp->flags &= ~PP_FLAGMASK; | |
478 | pp->flags |= (uflags & PP_FLAGMASK); | |
479 | return 0; | |
480 | } | |
481 | case PPGETFLAGS: | |
482 | { | |
483 | int uflags; | |
484 | ||
485 | uflags = pp->flags & PP_FLAGMASK; | |
486 | if (copy_to_user (argp, &uflags, sizeof (uflags))) { | |
487 | return -EFAULT; | |
488 | } | |
489 | return 0; | |
490 | } | |
491 | } /* end switch() */ | |
492 | ||
493 | /* Everything else requires the port to be claimed, so check | |
494 | * that now. */ | |
495 | if ((pp->flags & PP_CLAIMED) == 0) { | |
496 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", | |
497 | minor); | |
498 | return -EINVAL; | |
499 | } | |
500 | ||
501 | port = pp->pdev->port; | |
502 | switch (cmd) { | |
503 | struct ieee1284_info *info; | |
504 | unsigned char reg; | |
505 | unsigned char mask; | |
506 | int mode; | |
507 | int ret; | |
508 | struct timeval par_timeout; | |
509 | long to_jiffies; | |
510 | ||
511 | case PPRSTATUS: | |
512 | reg = parport_read_status (port); | |
513 | if (copy_to_user (argp, ®, sizeof (reg))) | |
514 | return -EFAULT; | |
515 | return 0; | |
516 | case PPRDATA: | |
517 | reg = parport_read_data (port); | |
518 | if (copy_to_user (argp, ®, sizeof (reg))) | |
519 | return -EFAULT; | |
520 | return 0; | |
521 | case PPRCONTROL: | |
522 | reg = parport_read_control (port); | |
523 | if (copy_to_user (argp, ®, sizeof (reg))) | |
524 | return -EFAULT; | |
525 | return 0; | |
526 | case PPYIELD: | |
527 | parport_yield_blocking (pp->pdev); | |
528 | return 0; | |
529 | ||
530 | case PPRELEASE: | |
531 | /* Save the state machine's state. */ | |
532 | info = &pp->pdev->port->ieee1284; | |
533 | pp->state.mode = info->mode; | |
534 | pp->state.phase = info->phase; | |
535 | info->mode = pp->saved_state.mode; | |
536 | info->phase = pp->saved_state.phase; | |
537 | parport_release (pp->pdev); | |
538 | pp->flags &= ~PP_CLAIMED; | |
539 | return 0; | |
540 | ||
541 | case PPWCONTROL: | |
542 | if (copy_from_user (®, argp, sizeof (reg))) | |
543 | return -EFAULT; | |
544 | parport_write_control (port, reg); | |
545 | return 0; | |
546 | ||
547 | case PPWDATA: | |
548 | if (copy_from_user (®, argp, sizeof (reg))) | |
549 | return -EFAULT; | |
550 | parport_write_data (port, reg); | |
551 | return 0; | |
552 | ||
553 | case PPFCONTROL: | |
554 | if (copy_from_user (&mask, argp, | |
555 | sizeof (mask))) | |
556 | return -EFAULT; | |
557 | if (copy_from_user (®, 1 + (unsigned char __user *) arg, | |
558 | sizeof (reg))) | |
559 | return -EFAULT; | |
560 | parport_frob_control (port, mask, reg); | |
561 | return 0; | |
562 | ||
563 | case PPDATADIR: | |
564 | if (copy_from_user (&mode, argp, sizeof (mode))) | |
565 | return -EFAULT; | |
566 | if (mode) | |
567 | port->ops->data_reverse (port); | |
568 | else | |
569 | port->ops->data_forward (port); | |
570 | return 0; | |
571 | ||
572 | case PPNEGOT: | |
573 | if (copy_from_user (&mode, argp, sizeof (mode))) | |
574 | return -EFAULT; | |
575 | switch ((ret = parport_negotiate (port, mode))) { | |
576 | case 0: break; | |
577 | case -1: /* handshake failed, peripheral not IEEE 1284 */ | |
578 | ret = -EIO; | |
579 | break; | |
580 | case 1: /* handshake succeeded, peripheral rejected mode */ | |
581 | ret = -ENXIO; | |
582 | break; | |
583 | } | |
584 | pp_enable_irq (pp); | |
585 | return ret; | |
586 | ||
587 | case PPWCTLONIRQ: | |
588 | if (copy_from_user (®, argp, sizeof (reg))) | |
589 | return -EFAULT; | |
590 | ||
591 | /* Remember what to set the control lines to, for next | |
592 | * time we get an interrupt. */ | |
593 | pp->irqctl = reg; | |
594 | pp->irqresponse = 1; | |
595 | return 0; | |
596 | ||
597 | case PPCLRIRQ: | |
598 | ret = atomic_read (&pp->irqc); | |
599 | if (copy_to_user (argp, &ret, sizeof (ret))) | |
600 | return -EFAULT; | |
601 | atomic_sub (ret, &pp->irqc); | |
602 | return 0; | |
603 | ||
604 | case PPSETTIME: | |
605 | if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { | |
606 | return -EFAULT; | |
607 | } | |
608 | /* Convert to jiffies, place in pp->pdev->timeout */ | |
609 | if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { | |
610 | return -EINVAL; | |
611 | } | |
612 | to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); | |
613 | to_jiffies += par_timeout.tv_sec * (long)HZ; | |
614 | if (to_jiffies <= 0) { | |
615 | return -EINVAL; | |
616 | } | |
617 | pp->pdev->timeout = to_jiffies; | |
618 | return 0; | |
619 | ||
620 | case PPGETTIME: | |
621 | to_jiffies = pp->pdev->timeout; | |
622 | par_timeout.tv_sec = to_jiffies / HZ; | |
623 | par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); | |
624 | if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) | |
625 | return -EFAULT; | |
626 | return 0; | |
627 | ||
628 | default: | |
629 | printk (KERN_DEBUG CHRDEV "%x: What? (cmd=0x%x)\n", minor, | |
630 | cmd); | |
631 | return -EINVAL; | |
632 | } | |
633 | ||
634 | /* Keep the compiler happy */ | |
635 | return 0; | |
636 | } | |
637 | ||
638 | static int pp_open (struct inode * inode, struct file * file) | |
639 | { | |
640 | unsigned int minor = iminor(inode); | |
641 | struct pp_struct *pp; | |
642 | ||
643 | if (minor >= PARPORT_MAX) | |
644 | return -ENXIO; | |
645 | ||
646 | pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); | |
647 | if (!pp) | |
648 | return -ENOMEM; | |
649 | ||
650 | pp->state.mode = IEEE1284_MODE_COMPAT; | |
651 | pp->state.phase = init_phase (pp->state.mode); | |
652 | pp->flags = 0; | |
653 | pp->irqresponse = 0; | |
654 | atomic_set (&pp->irqc, 0); | |
655 | init_waitqueue_head (&pp->irq_wait); | |
656 | ||
657 | /* Defer the actual device registration until the first claim. | |
658 | * That way, we know whether or not the driver wants to have | |
659 | * exclusive access to the port (PPEXCL). | |
660 | */ | |
661 | pp->pdev = NULL; | |
662 | file->private_data = pp; | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
667 | static int pp_release (struct inode * inode, struct file * file) | |
668 | { | |
669 | unsigned int minor = iminor(inode); | |
670 | struct pp_struct *pp = file->private_data; | |
671 | int compat_negot; | |
672 | ||
673 | compat_negot = 0; | |
674 | if (!(pp->flags & PP_CLAIMED) && pp->pdev && | |
675 | (pp->state.mode != IEEE1284_MODE_COMPAT)) { | |
676 | struct ieee1284_info *info; | |
677 | ||
678 | /* parport released, but not in compatibility mode */ | |
679 | parport_claim_or_block (pp->pdev); | |
680 | pp->flags |= PP_CLAIMED; | |
681 | info = &pp->pdev->port->ieee1284; | |
682 | pp->saved_state.mode = info->mode; | |
683 | pp->saved_state.phase = info->phase; | |
684 | info->mode = pp->state.mode; | |
685 | info->phase = pp->state.phase; | |
686 | compat_negot = 1; | |
687 | } else if ((pp->flags & PP_CLAIMED) && pp->pdev && | |
688 | (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { | |
689 | compat_negot = 2; | |
690 | } | |
691 | if (compat_negot) { | |
692 | parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); | |
693 | printk (KERN_DEBUG CHRDEV | |
694 | "%x: negotiated back to compatibility mode because " | |
695 | "user-space forgot\n", minor); | |
696 | } | |
697 | ||
698 | if (pp->flags & PP_CLAIMED) { | |
699 | struct ieee1284_info *info; | |
700 | ||
701 | info = &pp->pdev->port->ieee1284; | |
702 | pp->state.mode = info->mode; | |
703 | pp->state.phase = info->phase; | |
704 | info->mode = pp->saved_state.mode; | |
705 | info->phase = pp->saved_state.phase; | |
706 | parport_release (pp->pdev); | |
707 | if (compat_negot != 1) { | |
708 | printk (KERN_DEBUG CHRDEV "%x: released pardevice " | |
709 | "because user-space forgot\n", minor); | |
710 | } | |
711 | } | |
712 | ||
713 | if (pp->pdev) { | |
714 | const char *name = pp->pdev->name; | |
715 | parport_unregister_device (pp->pdev); | |
716 | kfree (name); | |
717 | pp->pdev = NULL; | |
718 | printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n", | |
719 | minor); | |
720 | } | |
721 | ||
722 | kfree (pp); | |
723 | ||
724 | return 0; | |
725 | } | |
726 | ||
727 | /* No kernel lock held - fine */ | |
728 | static unsigned int pp_poll (struct file * file, poll_table * wait) | |
729 | { | |
730 | struct pp_struct *pp = file->private_data; | |
731 | unsigned int mask = 0; | |
732 | ||
733 | poll_wait (file, &pp->irq_wait, wait); | |
734 | if (atomic_read (&pp->irqc)) | |
735 | mask |= POLLIN | POLLRDNORM; | |
736 | ||
737 | return mask; | |
738 | } | |
739 | ||
ca8eca68 | 740 | static struct class *ppdev_class; |
1da177e4 LT |
741 | |
742 | static struct file_operations pp_fops = { | |
743 | .owner = THIS_MODULE, | |
744 | .llseek = no_llseek, | |
745 | .read = pp_read, | |
746 | .write = pp_write, | |
747 | .poll = pp_poll, | |
748 | .ioctl = pp_ioctl, | |
749 | .open = pp_open, | |
750 | .release = pp_release, | |
751 | }; | |
752 | ||
753 | static void pp_attach(struct parport *port) | |
754 | { | |
53f46542 | 755 | class_device_create(ppdev_class, NULL, MKDEV(PP_MAJOR, port->number), |
1da177e4 LT |
756 | NULL, "parport%d", port->number); |
757 | } | |
758 | ||
759 | static void pp_detach(struct parport *port) | |
760 | { | |
ca8eca68 | 761 | class_device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); |
1da177e4 LT |
762 | } |
763 | ||
764 | static struct parport_driver pp_driver = { | |
765 | .name = CHRDEV, | |
766 | .attach = pp_attach, | |
767 | .detach = pp_detach, | |
768 | }; | |
769 | ||
770 | static int __init ppdev_init (void) | |
771 | { | |
772 | int i, err = 0; | |
773 | ||
774 | if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) { | |
775 | printk (KERN_WARNING CHRDEV ": unable to get major %d\n", | |
776 | PP_MAJOR); | |
777 | return -EIO; | |
778 | } | |
ca8eca68 | 779 | ppdev_class = class_create(THIS_MODULE, CHRDEV); |
1da177e4 LT |
780 | if (IS_ERR(ppdev_class)) { |
781 | err = PTR_ERR(ppdev_class); | |
782 | goto out_chrdev; | |
783 | } | |
784 | devfs_mk_dir("parports"); | |
785 | for (i = 0; i < PARPORT_MAX; i++) { | |
786 | devfs_mk_cdev(MKDEV(PP_MAJOR, i), | |
787 | S_IFCHR | S_IRUGO | S_IWUGO, "parports/%d", i); | |
788 | } | |
789 | if (parport_register_driver(&pp_driver)) { | |
790 | printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); | |
791 | goto out_class; | |
792 | } | |
793 | ||
794 | printk (KERN_INFO PP_VERSION "\n"); | |
795 | goto out; | |
796 | ||
797 | out_class: | |
798 | for (i = 0; i < PARPORT_MAX; i++) | |
799 | devfs_remove("parports/%d", i); | |
800 | devfs_remove("parports"); | |
ca8eca68 | 801 | class_destroy(ppdev_class); |
1da177e4 LT |
802 | out_chrdev: |
803 | unregister_chrdev(PP_MAJOR, CHRDEV); | |
804 | out: | |
805 | return err; | |
806 | } | |
807 | ||
808 | static void __exit ppdev_cleanup (void) | |
809 | { | |
810 | int i; | |
811 | /* Clean up all parport stuff */ | |
812 | for (i = 0; i < PARPORT_MAX; i++) | |
813 | devfs_remove("parports/%d", i); | |
814 | parport_unregister_driver(&pp_driver); | |
815 | devfs_remove("parports"); | |
ca8eca68 | 816 | class_destroy(ppdev_class); |
1da177e4 LT |
817 | unregister_chrdev (PP_MAJOR, CHRDEV); |
818 | } | |
819 | ||
820 | module_init(ppdev_init); | |
821 | module_exit(ppdev_cleanup); | |
822 | ||
823 | MODULE_LICENSE("GPL"); | |
824 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |