Commit | Line | Data |
---|---|---|
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> | |
e6a67846 | 68 | #include <linux/major.h> |
1da177e4 LT |
69 | #include <linux/ppdev.h> |
70 | #include <linux/smp_lock.h> | |
71 | #include <linux/device.h> | |
e6a67846 | 72 | #include <asm/uaccess.h> |
1da177e4 LT |
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 | /* pp_struct.flags bitfields */ | |
90 | #define PP_CLAIMED (1<<0) | |
91 | #define PP_EXCL (1<<1) | |
92 | ||
93 | /* Other constants */ | |
94 | #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ | |
95 | #define PP_BUFFER_SIZE 1024 | |
96 | #define PARDEVICE_MAX 8 | |
97 | ||
98 | /* ROUND_UP macro from fs/select.c */ | |
99 | #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) | |
100 | ||
101 | static inline void pp_enable_irq (struct pp_struct *pp) | |
102 | { | |
103 | struct parport *port = pp->pdev->port; | |
104 | port->ops->enable_irq (port); | |
105 | } | |
106 | ||
107 | static ssize_t pp_read (struct file * file, char __user * buf, size_t count, | |
108 | loff_t * ppos) | |
109 | { | |
110 | unsigned int minor = iminor(file->f_dentry->d_inode); | |
111 | struct pp_struct *pp = file->private_data; | |
112 | char * kbuffer; | |
113 | ssize_t bytes_read = 0; | |
114 | struct parport *pport; | |
115 | int mode; | |
116 | ||
117 | if (!(pp->flags & PP_CLAIMED)) { | |
118 | /* Don't have the port claimed */ | |
119 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", | |
120 | minor); | |
121 | return -EINVAL; | |
122 | } | |
123 | ||
124 | /* Trivial case. */ | |
125 | if (count == 0) | |
126 | return 0; | |
127 | ||
128 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
129 | if (!kbuffer) { | |
130 | return -ENOMEM; | |
131 | } | |
132 | pport = pp->pdev->port; | |
133 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
134 | ||
135 | parport_set_timeout (pp->pdev, | |
136 | (file->f_flags & O_NONBLOCK) ? | |
137 | PARPORT_INACTIVITY_O_NONBLOCK : | |
138 | pp->default_inactivity); | |
139 | ||
140 | while (bytes_read == 0) { | |
141 | ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); | |
142 | ||
143 | if (mode == IEEE1284_MODE_EPP) { | |
144 | /* various specials for EPP mode */ | |
145 | int flags = 0; | |
146 | size_t (*fn)(struct parport *, void *, size_t, int); | |
147 | ||
148 | if (pp->flags & PP_W91284PIC) { | |
149 | flags |= PARPORT_W91284PIC; | |
150 | } | |
151 | if (pp->flags & PP_FASTREAD) { | |
152 | flags |= PARPORT_EPP_FAST; | |
153 | } | |
154 | if (pport->ieee1284.mode & IEEE1284_ADDR) { | |
155 | fn = pport->ops->epp_read_addr; | |
156 | } else { | |
157 | fn = pport->ops->epp_read_data; | |
158 | } | |
159 | bytes_read = (*fn)(pport, kbuffer, need, flags); | |
160 | } else { | |
161 | bytes_read = parport_read (pport, kbuffer, need); | |
162 | } | |
163 | ||
164 | if (bytes_read != 0) | |
165 | break; | |
166 | ||
167 | if (file->f_flags & O_NONBLOCK) { | |
168 | bytes_read = -EAGAIN; | |
169 | break; | |
170 | } | |
171 | ||
172 | if (signal_pending (current)) { | |
173 | bytes_read = -ERESTARTSYS; | |
174 | break; | |
175 | } | |
176 | ||
177 | cond_resched(); | |
178 | } | |
179 | ||
180 | parport_set_timeout (pp->pdev, pp->default_inactivity); | |
181 | ||
182 | if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read)) | |
183 | bytes_read = -EFAULT; | |
184 | ||
185 | kfree (kbuffer); | |
186 | pp_enable_irq (pp); | |
187 | return bytes_read; | |
188 | } | |
189 | ||
190 | static ssize_t pp_write (struct file * file, const char __user * buf, | |
191 | size_t count, loff_t * ppos) | |
192 | { | |
193 | unsigned int minor = iminor(file->f_dentry->d_inode); | |
194 | struct pp_struct *pp = file->private_data; | |
195 | char * kbuffer; | |
196 | ssize_t bytes_written = 0; | |
197 | ssize_t wrote; | |
198 | int mode; | |
199 | struct parport *pport; | |
200 | ||
201 | if (!(pp->flags & PP_CLAIMED)) { | |
202 | /* Don't have the port claimed */ | |
203 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", | |
204 | minor); | |
205 | return -EINVAL; | |
206 | } | |
207 | ||
208 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
209 | if (!kbuffer) { | |
210 | return -ENOMEM; | |
211 | } | |
212 | pport = pp->pdev->port; | |
213 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
214 | ||
215 | parport_set_timeout (pp->pdev, | |
216 | (file->f_flags & O_NONBLOCK) ? | |
217 | PARPORT_INACTIVITY_O_NONBLOCK : | |
218 | pp->default_inactivity); | |
219 | ||
220 | while (bytes_written < count) { | |
221 | ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); | |
222 | ||
223 | if (copy_from_user (kbuffer, buf + bytes_written, n)) { | |
224 | bytes_written = -EFAULT; | |
225 | break; | |
226 | } | |
227 | ||
228 | if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { | |
229 | /* do a fast EPP write */ | |
230 | if (pport->ieee1284.mode & IEEE1284_ADDR) { | |
231 | wrote = pport->ops->epp_write_addr (pport, | |
232 | kbuffer, n, PARPORT_EPP_FAST); | |
233 | } else { | |
234 | wrote = pport->ops->epp_write_data (pport, | |
235 | kbuffer, n, PARPORT_EPP_FAST); | |
236 | } | |
237 | } else { | |
238 | wrote = parport_write (pp->pdev->port, kbuffer, n); | |
239 | } | |
240 | ||
241 | if (wrote <= 0) { | |
242 | if (!bytes_written) { | |
243 | bytes_written = wrote; | |
244 | } | |
245 | break; | |
246 | } | |
247 | ||
248 | bytes_written += wrote; | |
249 | ||
250 | if (file->f_flags & O_NONBLOCK) { | |
251 | if (!bytes_written) | |
252 | bytes_written = -EAGAIN; | |
253 | break; | |
254 | } | |
255 | ||
256 | if (signal_pending (current)) { | |
257 | if (!bytes_written) { | |
258 | bytes_written = -EINTR; | |
259 | } | |
260 | break; | |
261 | } | |
262 | ||
263 | cond_resched(); | |
264 | } | |
265 | ||
266 | parport_set_timeout (pp->pdev, pp->default_inactivity); | |
267 | ||
268 | kfree (kbuffer); | |
269 | pp_enable_irq (pp); | |
270 | return bytes_written; | |
271 | } | |
272 | ||
273 | static void pp_irq (int irq, void * private, struct pt_regs * unused) | |
274 | { | |
275 | struct pp_struct * pp = (struct pp_struct *) private; | |
276 | ||
277 | if (pp->irqresponse) { | |
278 | parport_write_control (pp->pdev->port, pp->irqctl); | |
279 | pp->irqresponse = 0; | |
280 | } | |
281 | ||
282 | atomic_inc (&pp->irqc); | |
283 | wake_up_interruptible (&pp->irq_wait); | |
284 | } | |
285 | ||
286 | static int register_device (int minor, struct pp_struct *pp) | |
287 | { | |
288 | struct parport *port; | |
289 | struct pardevice * pdev = NULL; | |
290 | char *name; | |
291 | int fl; | |
292 | ||
293 | name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL); | |
294 | if (name == NULL) | |
295 | return -ENOMEM; | |
296 | ||
297 | sprintf (name, CHRDEV "%x", minor); | |
298 | ||
299 | port = parport_find_number (minor); | |
300 | if (!port) { | |
301 | printk (KERN_WARNING "%s: no associated port!\n", name); | |
302 | kfree (name); | |
303 | return -ENXIO; | |
304 | } | |
305 | ||
306 | fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; | |
307 | pdev = parport_register_device (port, name, NULL, | |
308 | NULL, pp_irq, fl, pp); | |
309 | parport_put_port (port); | |
310 | ||
311 | if (!pdev) { | |
312 | printk (KERN_WARNING "%s: failed to register device!\n", name); | |
313 | kfree (name); | |
314 | return -ENXIO; | |
315 | } | |
316 | ||
317 | pp->pdev = pdev; | |
318 | printk (KERN_DEBUG "%s: registered pardevice\n", name); | |
319 | return 0; | |
320 | } | |
321 | ||
322 | static enum ieee1284_phase init_phase (int mode) | |
323 | { | |
324 | switch (mode & ~(IEEE1284_DEVICEID | |
325 | | IEEE1284_ADDR)) { | |
326 | case IEEE1284_MODE_NIBBLE: | |
327 | case IEEE1284_MODE_BYTE: | |
328 | return IEEE1284_PH_REV_IDLE; | |
329 | } | |
330 | return IEEE1284_PH_FWD_IDLE; | |
331 | } | |
332 | ||
333 | static int pp_ioctl(struct inode *inode, struct file *file, | |
334 | unsigned int cmd, unsigned long arg) | |
335 | { | |
336 | unsigned int minor = iminor(inode); | |
337 | struct pp_struct *pp = file->private_data; | |
338 | struct parport * port; | |
339 | void __user *argp = (void __user *)arg; | |
340 | ||
341 | /* First handle the cases that don't take arguments. */ | |
342 | switch (cmd) { | |
343 | case PPCLAIM: | |
344 | { | |
345 | struct ieee1284_info *info; | |
346 | int ret; | |
347 | ||
348 | if (pp->flags & PP_CLAIMED) { | |
349 | printk (KERN_DEBUG CHRDEV | |
350 | "%x: you've already got it!\n", minor); | |
351 | return -EINVAL; | |
352 | } | |
353 | ||
354 | /* Deferred device registration. */ | |
355 | if (!pp->pdev) { | |
356 | int err = register_device (minor, pp); | |
357 | if (err) { | |
358 | return err; | |
359 | } | |
360 | } | |
361 | ||
362 | ret = parport_claim_or_block (pp->pdev); | |
363 | if (ret < 0) | |
364 | return ret; | |
365 | ||
366 | pp->flags |= PP_CLAIMED; | |
367 | ||
368 | /* For interrupt-reporting to work, we need to be | |
369 | * informed of each interrupt. */ | |
370 | pp_enable_irq (pp); | |
371 | ||
372 | /* We may need to fix up the state machine. */ | |
373 | info = &pp->pdev->port->ieee1284; | |
374 | pp->saved_state.mode = info->mode; | |
375 | pp->saved_state.phase = info->phase; | |
376 | info->mode = pp->state.mode; | |
377 | info->phase = pp->state.phase; | |
378 | pp->default_inactivity = parport_set_timeout (pp->pdev, 0); | |
379 | parport_set_timeout (pp->pdev, pp->default_inactivity); | |
380 | ||
381 | return 0; | |
382 | } | |
383 | case PPEXCL: | |
384 | if (pp->pdev) { | |
385 | printk (KERN_DEBUG CHRDEV "%x: too late for PPEXCL; " | |
386 | "already registered\n", minor); | |
387 | if (pp->flags & PP_EXCL) | |
388 | /* But it's not really an error. */ | |
389 | return 0; | |
390 | /* There's no chance of making the driver happy. */ | |
391 | return -EINVAL; | |
392 | } | |
393 | ||
394 | /* Just remember to register the device exclusively | |
395 | * when we finally do the registration. */ | |
396 | pp->flags |= PP_EXCL; | |
397 | return 0; | |
398 | case PPSETMODE: | |
399 | { | |
400 | int mode; | |
401 | if (copy_from_user (&mode, argp, sizeof (mode))) | |
402 | return -EFAULT; | |
403 | /* FIXME: validate mode */ | |
404 | pp->state.mode = mode; | |
405 | pp->state.phase = init_phase (mode); | |
406 | ||
407 | if (pp->flags & PP_CLAIMED) { | |
408 | pp->pdev->port->ieee1284.mode = mode; | |
409 | pp->pdev->port->ieee1284.phase = pp->state.phase; | |
410 | } | |
411 | ||
412 | return 0; | |
413 | } | |
414 | case PPGETMODE: | |
415 | { | |
416 | int mode; | |
417 | ||
418 | if (pp->flags & PP_CLAIMED) { | |
419 | mode = pp->pdev->port->ieee1284.mode; | |
420 | } else { | |
421 | mode = pp->state.mode; | |
422 | } | |
423 | if (copy_to_user (argp, &mode, sizeof (mode))) { | |
424 | return -EFAULT; | |
425 | } | |
426 | return 0; | |
427 | } | |
428 | case PPSETPHASE: | |
429 | { | |
430 | int phase; | |
431 | if (copy_from_user (&phase, argp, sizeof (phase))) { | |
432 | return -EFAULT; | |
433 | } | |
434 | /* FIXME: validate phase */ | |
435 | pp->state.phase = phase; | |
436 | ||
437 | if (pp->flags & PP_CLAIMED) { | |
438 | pp->pdev->port->ieee1284.phase = phase; | |
439 | } | |
440 | ||
441 | return 0; | |
442 | } | |
443 | case PPGETPHASE: | |
444 | { | |
445 | int phase; | |
446 | ||
447 | if (pp->flags & PP_CLAIMED) { | |
448 | phase = pp->pdev->port->ieee1284.phase; | |
449 | } else { | |
450 | phase = pp->state.phase; | |
451 | } | |
452 | if (copy_to_user (argp, &phase, sizeof (phase))) { | |
453 | return -EFAULT; | |
454 | } | |
455 | return 0; | |
456 | } | |
457 | case PPGETMODES: | |
458 | { | |
459 | unsigned int modes; | |
460 | ||
461 | port = parport_find_number (minor); | |
462 | if (!port) | |
463 | return -ENODEV; | |
464 | ||
465 | modes = port->modes; | |
466 | if (copy_to_user (argp, &modes, sizeof (modes))) { | |
467 | return -EFAULT; | |
468 | } | |
469 | return 0; | |
470 | } | |
471 | case PPSETFLAGS: | |
472 | { | |
473 | int uflags; | |
474 | ||
475 | if (copy_from_user (&uflags, argp, sizeof (uflags))) { | |
476 | return -EFAULT; | |
477 | } | |
478 | pp->flags &= ~PP_FLAGMASK; | |
479 | pp->flags |= (uflags & PP_FLAGMASK); | |
480 | return 0; | |
481 | } | |
482 | case PPGETFLAGS: | |
483 | { | |
484 | int uflags; | |
485 | ||
486 | uflags = pp->flags & PP_FLAGMASK; | |
487 | if (copy_to_user (argp, &uflags, sizeof (uflags))) { | |
488 | return -EFAULT; | |
489 | } | |
490 | return 0; | |
491 | } | |
492 | } /* end switch() */ | |
493 | ||
494 | /* Everything else requires the port to be claimed, so check | |
495 | * that now. */ | |
496 | if ((pp->flags & PP_CLAIMED) == 0) { | |
497 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", | |
498 | minor); | |
499 | return -EINVAL; | |
500 | } | |
501 | ||
502 | port = pp->pdev->port; | |
503 | switch (cmd) { | |
504 | struct ieee1284_info *info; | |
505 | unsigned char reg; | |
506 | unsigned char mask; | |
507 | int mode; | |
508 | int ret; | |
509 | struct timeval par_timeout; | |
510 | long to_jiffies; | |
511 | ||
512 | case PPRSTATUS: | |
513 | reg = parport_read_status (port); | |
514 | if (copy_to_user (argp, ®, sizeof (reg))) | |
515 | return -EFAULT; | |
516 | return 0; | |
517 | case PPRDATA: | |
518 | reg = parport_read_data (port); | |
519 | if (copy_to_user (argp, ®, sizeof (reg))) | |
520 | return -EFAULT; | |
521 | return 0; | |
522 | case PPRCONTROL: | |
523 | reg = parport_read_control (port); | |
524 | if (copy_to_user (argp, ®, sizeof (reg))) | |
525 | return -EFAULT; | |
526 | return 0; | |
527 | case PPYIELD: | |
528 | parport_yield_blocking (pp->pdev); | |
529 | return 0; | |
530 | ||
531 | case PPRELEASE: | |
532 | /* Save the state machine's state. */ | |
533 | info = &pp->pdev->port->ieee1284; | |
534 | pp->state.mode = info->mode; | |
535 | pp->state.phase = info->phase; | |
536 | info->mode = pp->saved_state.mode; | |
537 | info->phase = pp->saved_state.phase; | |
538 | parport_release (pp->pdev); | |
539 | pp->flags &= ~PP_CLAIMED; | |
540 | return 0; | |
541 | ||
542 | case PPWCONTROL: | |
543 | if (copy_from_user (®, argp, sizeof (reg))) | |
544 | return -EFAULT; | |
545 | parport_write_control (port, reg); | |
546 | return 0; | |
547 | ||
548 | case PPWDATA: | |
549 | if (copy_from_user (®, argp, sizeof (reg))) | |
550 | return -EFAULT; | |
551 | parport_write_data (port, reg); | |
552 | return 0; | |
553 | ||
554 | case PPFCONTROL: | |
555 | if (copy_from_user (&mask, argp, | |
556 | sizeof (mask))) | |
557 | return -EFAULT; | |
558 | if (copy_from_user (®, 1 + (unsigned char __user *) arg, | |
559 | sizeof (reg))) | |
560 | return -EFAULT; | |
561 | parport_frob_control (port, mask, reg); | |
562 | return 0; | |
563 | ||
564 | case PPDATADIR: | |
565 | if (copy_from_user (&mode, argp, sizeof (mode))) | |
566 | return -EFAULT; | |
567 | if (mode) | |
568 | port->ops->data_reverse (port); | |
569 | else | |
570 | port->ops->data_forward (port); | |
571 | return 0; | |
572 | ||
573 | case PPNEGOT: | |
574 | if (copy_from_user (&mode, argp, sizeof (mode))) | |
575 | return -EFAULT; | |
576 | switch ((ret = parport_negotiate (port, mode))) { | |
577 | case 0: break; | |
578 | case -1: /* handshake failed, peripheral not IEEE 1284 */ | |
579 | ret = -EIO; | |
580 | break; | |
581 | case 1: /* handshake succeeded, peripheral rejected mode */ | |
582 | ret = -ENXIO; | |
583 | break; | |
584 | } | |
585 | pp_enable_irq (pp); | |
586 | return ret; | |
587 | ||
588 | case PPWCTLONIRQ: | |
589 | if (copy_from_user (®, argp, sizeof (reg))) | |
590 | return -EFAULT; | |
591 | ||
592 | /* Remember what to set the control lines to, for next | |
593 | * time we get an interrupt. */ | |
594 | pp->irqctl = reg; | |
595 | pp->irqresponse = 1; | |
596 | return 0; | |
597 | ||
598 | case PPCLRIRQ: | |
599 | ret = atomic_read (&pp->irqc); | |
600 | if (copy_to_user (argp, &ret, sizeof (ret))) | |
601 | return -EFAULT; | |
602 | atomic_sub (ret, &pp->irqc); | |
603 | return 0; | |
604 | ||
605 | case PPSETTIME: | |
606 | if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { | |
607 | return -EFAULT; | |
608 | } | |
609 | /* Convert to jiffies, place in pp->pdev->timeout */ | |
610 | if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { | |
611 | return -EINVAL; | |
612 | } | |
613 | to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); | |
614 | to_jiffies += par_timeout.tv_sec * (long)HZ; | |
615 | if (to_jiffies <= 0) { | |
616 | return -EINVAL; | |
617 | } | |
618 | pp->pdev->timeout = to_jiffies; | |
619 | return 0; | |
620 | ||
621 | case PPGETTIME: | |
622 | to_jiffies = pp->pdev->timeout; | |
623 | par_timeout.tv_sec = to_jiffies / HZ; | |
624 | par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); | |
625 | if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) | |
626 | return -EFAULT; | |
627 | return 0; | |
628 | ||
629 | default: | |
630 | printk (KERN_DEBUG CHRDEV "%x: What? (cmd=0x%x)\n", minor, | |
631 | cmd); | |
632 | return -EINVAL; | |
633 | } | |
634 | ||
635 | /* Keep the compiler happy */ | |
636 | return 0; | |
637 | } | |
638 | ||
639 | static int pp_open (struct inode * inode, struct file * file) | |
640 | { | |
641 | unsigned int minor = iminor(inode); | |
642 | struct pp_struct *pp; | |
643 | ||
644 | if (minor >= PARPORT_MAX) | |
645 | return -ENXIO; | |
646 | ||
647 | pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); | |
648 | if (!pp) | |
649 | return -ENOMEM; | |
650 | ||
651 | pp->state.mode = IEEE1284_MODE_COMPAT; | |
652 | pp->state.phase = init_phase (pp->state.mode); | |
653 | pp->flags = 0; | |
654 | pp->irqresponse = 0; | |
655 | atomic_set (&pp->irqc, 0); | |
656 | init_waitqueue_head (&pp->irq_wait); | |
657 | ||
658 | /* Defer the actual device registration until the first claim. | |
659 | * That way, we know whether or not the driver wants to have | |
660 | * exclusive access to the port (PPEXCL). | |
661 | */ | |
662 | pp->pdev = NULL; | |
663 | file->private_data = pp; | |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
668 | static int pp_release (struct inode * inode, struct file * file) | |
669 | { | |
670 | unsigned int minor = iminor(inode); | |
671 | struct pp_struct *pp = file->private_data; | |
672 | int compat_negot; | |
673 | ||
674 | compat_negot = 0; | |
675 | if (!(pp->flags & PP_CLAIMED) && pp->pdev && | |
676 | (pp->state.mode != IEEE1284_MODE_COMPAT)) { | |
677 | struct ieee1284_info *info; | |
678 | ||
679 | /* parport released, but not in compatibility mode */ | |
680 | parport_claim_or_block (pp->pdev); | |
681 | pp->flags |= PP_CLAIMED; | |
682 | info = &pp->pdev->port->ieee1284; | |
683 | pp->saved_state.mode = info->mode; | |
684 | pp->saved_state.phase = info->phase; | |
685 | info->mode = pp->state.mode; | |
686 | info->phase = pp->state.phase; | |
687 | compat_negot = 1; | |
688 | } else if ((pp->flags & PP_CLAIMED) && pp->pdev && | |
689 | (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { | |
690 | compat_negot = 2; | |
691 | } | |
692 | if (compat_negot) { | |
693 | parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); | |
694 | printk (KERN_DEBUG CHRDEV | |
695 | "%x: negotiated back to compatibility mode because " | |
696 | "user-space forgot\n", minor); | |
697 | } | |
698 | ||
699 | if (pp->flags & PP_CLAIMED) { | |
700 | struct ieee1284_info *info; | |
701 | ||
702 | info = &pp->pdev->port->ieee1284; | |
703 | pp->state.mode = info->mode; | |
704 | pp->state.phase = info->phase; | |
705 | info->mode = pp->saved_state.mode; | |
706 | info->phase = pp->saved_state.phase; | |
707 | parport_release (pp->pdev); | |
708 | if (compat_negot != 1) { | |
709 | printk (KERN_DEBUG CHRDEV "%x: released pardevice " | |
710 | "because user-space forgot\n", minor); | |
711 | } | |
712 | } | |
713 | ||
714 | if (pp->pdev) { | |
715 | const char *name = pp->pdev->name; | |
716 | parport_unregister_device (pp->pdev); | |
717 | kfree (name); | |
718 | pp->pdev = NULL; | |
719 | printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n", | |
720 | minor); | |
721 | } | |
722 | ||
723 | kfree (pp); | |
724 | ||
725 | return 0; | |
726 | } | |
727 | ||
728 | /* No kernel lock held - fine */ | |
729 | static unsigned int pp_poll (struct file * file, poll_table * wait) | |
730 | { | |
731 | struct pp_struct *pp = file->private_data; | |
732 | unsigned int mask = 0; | |
733 | ||
734 | poll_wait (file, &pp->irq_wait, wait); | |
735 | if (atomic_read (&pp->irqc)) | |
736 | mask |= POLLIN | POLLRDNORM; | |
737 | ||
738 | return mask; | |
739 | } | |
740 | ||
ca8eca68 | 741 | static struct class *ppdev_class; |
1da177e4 LT |
742 | |
743 | static struct file_operations pp_fops = { | |
744 | .owner = THIS_MODULE, | |
745 | .llseek = no_llseek, | |
746 | .read = pp_read, | |
747 | .write = pp_write, | |
748 | .poll = pp_poll, | |
749 | .ioctl = pp_ioctl, | |
750 | .open = pp_open, | |
751 | .release = pp_release, | |
752 | }; | |
753 | ||
754 | static void pp_attach(struct parport *port) | |
755 | { | |
53f46542 | 756 | class_device_create(ppdev_class, NULL, MKDEV(PP_MAJOR, port->number), |
1da177e4 LT |
757 | NULL, "parport%d", port->number); |
758 | } | |
759 | ||
760 | static void pp_detach(struct parport *port) | |
761 | { | |
ca8eca68 | 762 | class_device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); |
1da177e4 LT |
763 | } |
764 | ||
765 | static struct parport_driver pp_driver = { | |
766 | .name = CHRDEV, | |
767 | .attach = pp_attach, | |
768 | .detach = pp_detach, | |
769 | }; | |
770 | ||
771 | static int __init ppdev_init (void) | |
772 | { | |
773 | int i, err = 0; | |
774 | ||
775 | if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) { | |
776 | printk (KERN_WARNING CHRDEV ": unable to get major %d\n", | |
777 | PP_MAJOR); | |
778 | return -EIO; | |
779 | } | |
ca8eca68 | 780 | ppdev_class = class_create(THIS_MODULE, CHRDEV); |
1da177e4 LT |
781 | if (IS_ERR(ppdev_class)) { |
782 | err = PTR_ERR(ppdev_class); | |
783 | goto out_chrdev; | |
784 | } | |
1da177e4 LT |
785 | if (parport_register_driver(&pp_driver)) { |
786 | printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); | |
787 | goto out_class; | |
788 | } | |
789 | ||
790 | printk (KERN_INFO PP_VERSION "\n"); | |
791 | goto out; | |
792 | ||
793 | out_class: | |
794 | for (i = 0; i < PARPORT_MAX; i++) | |
795 | devfs_remove("parports/%d", i); | |
796 | devfs_remove("parports"); | |
ca8eca68 | 797 | class_destroy(ppdev_class); |
1da177e4 LT |
798 | out_chrdev: |
799 | unregister_chrdev(PP_MAJOR, CHRDEV); | |
800 | out: | |
801 | return err; | |
802 | } | |
803 | ||
804 | static void __exit ppdev_cleanup (void) | |
805 | { | |
806 | int i; | |
807 | /* Clean up all parport stuff */ | |
808 | for (i = 0; i < PARPORT_MAX; i++) | |
809 | devfs_remove("parports/%d", i); | |
810 | parport_unregister_driver(&pp_driver); | |
811 | devfs_remove("parports"); | |
ca8eca68 | 812 | class_destroy(ppdev_class); |
1da177e4 LT |
813 | unregister_chrdev (PP_MAJOR, CHRDEV); |
814 | } | |
815 | ||
816 | module_init(ppdev_init); | |
817 | module_exit(ppdev_cleanup); | |
818 | ||
819 | MODULE_LICENSE("GPL"); | |
820 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |