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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> | |
1da177e4 LT |
63 | #include <linux/ioctl.h> |
64 | #include <linux/parport.h> | |
65 | #include <linux/ctype.h> | |
66 | #include <linux/poll.h> | |
e6a67846 | 67 | #include <linux/major.h> |
1da177e4 | 68 | #include <linux/ppdev.h> |
1da177e4 | 69 | #include <linux/device.h> |
e6a67846 | 70 | #include <asm/uaccess.h> |
1da177e4 LT |
71 | |
72 | #define PP_VERSION "ppdev: user-space parallel port driver" | |
73 | #define CHRDEV "ppdev" | |
74 | ||
75 | struct pp_struct { | |
76 | struct pardevice * pdev; | |
77 | wait_queue_head_t irq_wait; | |
78 | atomic_t irqc; | |
79 | unsigned int flags; | |
80 | int irqresponse; | |
81 | unsigned char irqctl; | |
82 | struct ieee1284_info state; | |
83 | struct ieee1284_info saved_state; | |
84 | long default_inactivity; | |
85 | }; | |
86 | ||
87 | /* pp_struct.flags bitfields */ | |
88 | #define PP_CLAIMED (1<<0) | |
89 | #define PP_EXCL (1<<1) | |
90 | ||
91 | /* Other constants */ | |
92 | #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ | |
93 | #define PP_BUFFER_SIZE 1024 | |
94 | #define PARDEVICE_MAX 8 | |
95 | ||
96 | /* ROUND_UP macro from fs/select.c */ | |
97 | #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) | |
98 | ||
99 | static inline void pp_enable_irq (struct pp_struct *pp) | |
100 | { | |
101 | struct parport *port = pp->pdev->port; | |
102 | port->ops->enable_irq (port); | |
103 | } | |
104 | ||
105 | static ssize_t pp_read (struct file * file, char __user * buf, size_t count, | |
106 | loff_t * ppos) | |
107 | { | |
a7113a96 | 108 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
1da177e4 LT |
109 | struct pp_struct *pp = file->private_data; |
110 | char * kbuffer; | |
111 | ssize_t bytes_read = 0; | |
112 | struct parport *pport; | |
113 | int mode; | |
114 | ||
115 | if (!(pp->flags & PP_CLAIMED)) { | |
116 | /* Don't have the port claimed */ | |
117 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", | |
118 | minor); | |
119 | return -EINVAL; | |
120 | } | |
121 | ||
122 | /* Trivial case. */ | |
123 | if (count == 0) | |
124 | return 0; | |
125 | ||
126 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
127 | if (!kbuffer) { | |
128 | return -ENOMEM; | |
129 | } | |
130 | pport = pp->pdev->port; | |
131 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
132 | ||
133 | parport_set_timeout (pp->pdev, | |
134 | (file->f_flags & O_NONBLOCK) ? | |
135 | PARPORT_INACTIVITY_O_NONBLOCK : | |
136 | pp->default_inactivity); | |
137 | ||
138 | while (bytes_read == 0) { | |
139 | ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); | |
140 | ||
141 | if (mode == IEEE1284_MODE_EPP) { | |
142 | /* various specials for EPP mode */ | |
143 | int flags = 0; | |
144 | size_t (*fn)(struct parport *, void *, size_t, int); | |
145 | ||
146 | if (pp->flags & PP_W91284PIC) { | |
147 | flags |= PARPORT_W91284PIC; | |
148 | } | |
149 | if (pp->flags & PP_FASTREAD) { | |
150 | flags |= PARPORT_EPP_FAST; | |
151 | } | |
152 | if (pport->ieee1284.mode & IEEE1284_ADDR) { | |
153 | fn = pport->ops->epp_read_addr; | |
154 | } else { | |
155 | fn = pport->ops->epp_read_data; | |
156 | } | |
157 | bytes_read = (*fn)(pport, kbuffer, need, flags); | |
158 | } else { | |
159 | bytes_read = parport_read (pport, kbuffer, need); | |
160 | } | |
161 | ||
162 | if (bytes_read != 0) | |
163 | break; | |
164 | ||
165 | if (file->f_flags & O_NONBLOCK) { | |
166 | bytes_read = -EAGAIN; | |
167 | break; | |
168 | } | |
169 | ||
170 | if (signal_pending (current)) { | |
171 | bytes_read = -ERESTARTSYS; | |
172 | break; | |
173 | } | |
174 | ||
175 | cond_resched(); | |
176 | } | |
177 | ||
178 | parport_set_timeout (pp->pdev, pp->default_inactivity); | |
179 | ||
180 | if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read)) | |
181 | bytes_read = -EFAULT; | |
182 | ||
183 | kfree (kbuffer); | |
184 | pp_enable_irq (pp); | |
185 | return bytes_read; | |
186 | } | |
187 | ||
188 | static ssize_t pp_write (struct file * file, const char __user * buf, | |
189 | size_t count, loff_t * ppos) | |
190 | { | |
a7113a96 | 191 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
1da177e4 LT |
192 | struct pp_struct *pp = file->private_data; |
193 | char * kbuffer; | |
194 | ssize_t bytes_written = 0; | |
195 | ssize_t wrote; | |
196 | int mode; | |
197 | struct parport *pport; | |
198 | ||
199 | if (!(pp->flags & PP_CLAIMED)) { | |
200 | /* Don't have the port claimed */ | |
201 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", | |
202 | minor); | |
203 | return -EINVAL; | |
204 | } | |
205 | ||
206 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
207 | if (!kbuffer) { | |
208 | return -ENOMEM; | |
209 | } | |
210 | pport = pp->pdev->port; | |
211 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
212 | ||
213 | parport_set_timeout (pp->pdev, | |
214 | (file->f_flags & O_NONBLOCK) ? | |
215 | PARPORT_INACTIVITY_O_NONBLOCK : | |
216 | pp->default_inactivity); | |
217 | ||
218 | while (bytes_written < count) { | |
219 | ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); | |
220 | ||
221 | if (copy_from_user (kbuffer, buf + bytes_written, n)) { | |
222 | bytes_written = -EFAULT; | |
223 | break; | |
224 | } | |
225 | ||
226 | if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { | |
227 | /* do a fast EPP write */ | |
228 | if (pport->ieee1284.mode & IEEE1284_ADDR) { | |
229 | wrote = pport->ops->epp_write_addr (pport, | |
230 | kbuffer, n, PARPORT_EPP_FAST); | |
231 | } else { | |
232 | wrote = pport->ops->epp_write_data (pport, | |
233 | kbuffer, n, PARPORT_EPP_FAST); | |
234 | } | |
235 | } else { | |
236 | wrote = parport_write (pp->pdev->port, kbuffer, n); | |
237 | } | |
238 | ||
239 | if (wrote <= 0) { | |
240 | if (!bytes_written) { | |
241 | bytes_written = wrote; | |
242 | } | |
243 | break; | |
244 | } | |
245 | ||
246 | bytes_written += wrote; | |
247 | ||
248 | if (file->f_flags & O_NONBLOCK) { | |
249 | if (!bytes_written) | |
250 | bytes_written = -EAGAIN; | |
251 | break; | |
252 | } | |
253 | ||
254 | if (signal_pending (current)) { | |
255 | if (!bytes_written) { | |
256 | bytes_written = -EINTR; | |
257 | } | |
258 | break; | |
259 | } | |
260 | ||
261 | cond_resched(); | |
262 | } | |
263 | ||
264 | parport_set_timeout (pp->pdev, pp->default_inactivity); | |
265 | ||
266 | kfree (kbuffer); | |
267 | pp_enable_irq (pp); | |
268 | return bytes_written; | |
269 | } | |
270 | ||
7d12e780 | 271 | static void pp_irq (int irq, void * private) |
1da177e4 LT |
272 | { |
273 | struct pp_struct * pp = (struct pp_struct *) private; | |
274 | ||
275 | if (pp->irqresponse) { | |
276 | parport_write_control (pp->pdev->port, pp->irqctl); | |
277 | pp->irqresponse = 0; | |
278 | } | |
279 | ||
280 | atomic_inc (&pp->irqc); | |
281 | wake_up_interruptible (&pp->irq_wait); | |
282 | } | |
283 | ||
284 | static int register_device (int minor, struct pp_struct *pp) | |
285 | { | |
286 | struct parport *port; | |
287 | struct pardevice * pdev = NULL; | |
288 | char *name; | |
289 | int fl; | |
290 | ||
291 | name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL); | |
292 | if (name == NULL) | |
293 | return -ENOMEM; | |
294 | ||
295 | sprintf (name, CHRDEV "%x", minor); | |
296 | ||
297 | port = parport_find_number (minor); | |
298 | if (!port) { | |
299 | printk (KERN_WARNING "%s: no associated port!\n", name); | |
300 | kfree (name); | |
301 | return -ENXIO; | |
302 | } | |
303 | ||
304 | fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; | |
305 | pdev = parport_register_device (port, name, NULL, | |
306 | NULL, pp_irq, fl, pp); | |
307 | parport_put_port (port); | |
308 | ||
309 | if (!pdev) { | |
310 | printk (KERN_WARNING "%s: failed to register device!\n", name); | |
311 | kfree (name); | |
312 | return -ENXIO; | |
313 | } | |
314 | ||
315 | pp->pdev = pdev; | |
316 | printk (KERN_DEBUG "%s: registered pardevice\n", name); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static enum ieee1284_phase init_phase (int mode) | |
321 | { | |
322 | switch (mode & ~(IEEE1284_DEVICEID | |
323 | | IEEE1284_ADDR)) { | |
324 | case IEEE1284_MODE_NIBBLE: | |
325 | case IEEE1284_MODE_BYTE: | |
326 | return IEEE1284_PH_REV_IDLE; | |
327 | } | |
328 | return IEEE1284_PH_FWD_IDLE; | |
329 | } | |
330 | ||
331 | static int pp_ioctl(struct inode *inode, struct file *file, | |
332 | unsigned int cmd, unsigned long arg) | |
333 | { | |
334 | unsigned int minor = iminor(inode); | |
335 | struct pp_struct *pp = file->private_data; | |
336 | struct parport * port; | |
337 | void __user *argp = (void __user *)arg; | |
338 | ||
339 | /* First handle the cases that don't take arguments. */ | |
340 | switch (cmd) { | |
341 | case PPCLAIM: | |
342 | { | |
343 | struct ieee1284_info *info; | |
344 | int ret; | |
345 | ||
346 | if (pp->flags & PP_CLAIMED) { | |
347 | printk (KERN_DEBUG CHRDEV | |
348 | "%x: you've already got it!\n", minor); | |
349 | return -EINVAL; | |
350 | } | |
351 | ||
352 | /* Deferred device registration. */ | |
353 | if (!pp->pdev) { | |
354 | int err = register_device (minor, pp); | |
355 | if (err) { | |
356 | return err; | |
357 | } | |
358 | } | |
359 | ||
360 | ret = parport_claim_or_block (pp->pdev); | |
361 | if (ret < 0) | |
362 | return ret; | |
363 | ||
364 | pp->flags |= PP_CLAIMED; | |
365 | ||
366 | /* For interrupt-reporting to work, we need to be | |
367 | * informed of each interrupt. */ | |
368 | pp_enable_irq (pp); | |
369 | ||
370 | /* We may need to fix up the state machine. */ | |
371 | info = &pp->pdev->port->ieee1284; | |
372 | pp->saved_state.mode = info->mode; | |
373 | pp->saved_state.phase = info->phase; | |
374 | info->mode = pp->state.mode; | |
375 | info->phase = pp->state.phase; | |
376 | pp->default_inactivity = parport_set_timeout (pp->pdev, 0); | |
377 | parport_set_timeout (pp->pdev, pp->default_inactivity); | |
378 | ||
379 | return 0; | |
380 | } | |
381 | case PPEXCL: | |
382 | if (pp->pdev) { | |
383 | printk (KERN_DEBUG CHRDEV "%x: too late for PPEXCL; " | |
384 | "already registered\n", minor); | |
385 | if (pp->flags & PP_EXCL) | |
386 | /* But it's not really an error. */ | |
387 | return 0; | |
388 | /* There's no chance of making the driver happy. */ | |
389 | return -EINVAL; | |
390 | } | |
391 | ||
392 | /* Just remember to register the device exclusively | |
393 | * when we finally do the registration. */ | |
394 | pp->flags |= PP_EXCL; | |
395 | return 0; | |
396 | case PPSETMODE: | |
397 | { | |
398 | int mode; | |
399 | if (copy_from_user (&mode, argp, sizeof (mode))) | |
400 | return -EFAULT; | |
401 | /* FIXME: validate mode */ | |
402 | pp->state.mode = mode; | |
403 | pp->state.phase = init_phase (mode); | |
404 | ||
405 | if (pp->flags & PP_CLAIMED) { | |
406 | pp->pdev->port->ieee1284.mode = mode; | |
407 | pp->pdev->port->ieee1284.phase = pp->state.phase; | |
408 | } | |
409 | ||
410 | return 0; | |
411 | } | |
412 | case PPGETMODE: | |
413 | { | |
414 | int mode; | |
415 | ||
416 | if (pp->flags & PP_CLAIMED) { | |
417 | mode = pp->pdev->port->ieee1284.mode; | |
418 | } else { | |
419 | mode = pp->state.mode; | |
420 | } | |
421 | if (copy_to_user (argp, &mode, sizeof (mode))) { | |
422 | return -EFAULT; | |
423 | } | |
424 | return 0; | |
425 | } | |
426 | case PPSETPHASE: | |
427 | { | |
428 | int phase; | |
429 | if (copy_from_user (&phase, argp, sizeof (phase))) { | |
430 | return -EFAULT; | |
431 | } | |
432 | /* FIXME: validate phase */ | |
433 | pp->state.phase = phase; | |
434 | ||
435 | if (pp->flags & PP_CLAIMED) { | |
436 | pp->pdev->port->ieee1284.phase = phase; | |
437 | } | |
438 | ||
439 | return 0; | |
440 | } | |
441 | case PPGETPHASE: | |
442 | { | |
443 | int phase; | |
444 | ||
445 | if (pp->flags & PP_CLAIMED) { | |
446 | phase = pp->pdev->port->ieee1284.phase; | |
447 | } else { | |
448 | phase = pp->state.phase; | |
449 | } | |
450 | if (copy_to_user (argp, &phase, sizeof (phase))) { | |
451 | return -EFAULT; | |
452 | } | |
453 | return 0; | |
454 | } | |
455 | case PPGETMODES: | |
456 | { | |
457 | unsigned int modes; | |
458 | ||
459 | port = parport_find_number (minor); | |
460 | if (!port) | |
461 | return -ENODEV; | |
462 | ||
463 | modes = port->modes; | |
464 | if (copy_to_user (argp, &modes, sizeof (modes))) { | |
465 | return -EFAULT; | |
466 | } | |
467 | return 0; | |
468 | } | |
469 | case PPSETFLAGS: | |
470 | { | |
471 | int uflags; | |
472 | ||
473 | if (copy_from_user (&uflags, argp, sizeof (uflags))) { | |
474 | return -EFAULT; | |
475 | } | |
476 | pp->flags &= ~PP_FLAGMASK; | |
477 | pp->flags |= (uflags & PP_FLAGMASK); | |
478 | return 0; | |
479 | } | |
480 | case PPGETFLAGS: | |
481 | { | |
482 | int uflags; | |
483 | ||
484 | uflags = pp->flags & PP_FLAGMASK; | |
485 | if (copy_to_user (argp, &uflags, sizeof (uflags))) { | |
486 | return -EFAULT; | |
487 | } | |
488 | return 0; | |
489 | } | |
490 | } /* end switch() */ | |
491 | ||
492 | /* Everything else requires the port to be claimed, so check | |
493 | * that now. */ | |
494 | if ((pp->flags & PP_CLAIMED) == 0) { | |
495 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", | |
496 | minor); | |
497 | return -EINVAL; | |
498 | } | |
499 | ||
500 | port = pp->pdev->port; | |
501 | switch (cmd) { | |
502 | struct ieee1284_info *info; | |
503 | unsigned char reg; | |
504 | unsigned char mask; | |
505 | int mode; | |
506 | int ret; | |
507 | struct timeval par_timeout; | |
508 | long to_jiffies; | |
509 | ||
510 | case PPRSTATUS: | |
511 | reg = parport_read_status (port); | |
512 | if (copy_to_user (argp, ®, sizeof (reg))) | |
513 | return -EFAULT; | |
514 | return 0; | |
515 | case PPRDATA: | |
516 | reg = parport_read_data (port); | |
517 | if (copy_to_user (argp, ®, sizeof (reg))) | |
518 | return -EFAULT; | |
519 | return 0; | |
520 | case PPRCONTROL: | |
521 | reg = parport_read_control (port); | |
522 | if (copy_to_user (argp, ®, sizeof (reg))) | |
523 | return -EFAULT; | |
524 | return 0; | |
525 | case PPYIELD: | |
526 | parport_yield_blocking (pp->pdev); | |
527 | return 0; | |
528 | ||
529 | case PPRELEASE: | |
530 | /* Save the state machine's state. */ | |
531 | info = &pp->pdev->port->ieee1284; | |
532 | pp->state.mode = info->mode; | |
533 | pp->state.phase = info->phase; | |
534 | info->mode = pp->saved_state.mode; | |
535 | info->phase = pp->saved_state.phase; | |
536 | parport_release (pp->pdev); | |
537 | pp->flags &= ~PP_CLAIMED; | |
538 | return 0; | |
539 | ||
540 | case PPWCONTROL: | |
541 | if (copy_from_user (®, argp, sizeof (reg))) | |
542 | return -EFAULT; | |
543 | parport_write_control (port, reg); | |
544 | return 0; | |
545 | ||
546 | case PPWDATA: | |
547 | if (copy_from_user (®, argp, sizeof (reg))) | |
548 | return -EFAULT; | |
549 | parport_write_data (port, reg); | |
550 | return 0; | |
551 | ||
552 | case PPFCONTROL: | |
553 | if (copy_from_user (&mask, argp, | |
554 | sizeof (mask))) | |
555 | return -EFAULT; | |
556 | if (copy_from_user (®, 1 + (unsigned char __user *) arg, | |
557 | sizeof (reg))) | |
558 | return -EFAULT; | |
559 | parport_frob_control (port, mask, reg); | |
560 | return 0; | |
561 | ||
562 | case PPDATADIR: | |
563 | if (copy_from_user (&mode, argp, sizeof (mode))) | |
564 | return -EFAULT; | |
565 | if (mode) | |
566 | port->ops->data_reverse (port); | |
567 | else | |
568 | port->ops->data_forward (port); | |
569 | return 0; | |
570 | ||
571 | case PPNEGOT: | |
572 | if (copy_from_user (&mode, argp, sizeof (mode))) | |
573 | return -EFAULT; | |
574 | switch ((ret = parport_negotiate (port, mode))) { | |
575 | case 0: break; | |
576 | case -1: /* handshake failed, peripheral not IEEE 1284 */ | |
577 | ret = -EIO; | |
578 | break; | |
579 | case 1: /* handshake succeeded, peripheral rejected mode */ | |
580 | ret = -ENXIO; | |
581 | break; | |
582 | } | |
583 | pp_enable_irq (pp); | |
584 | return ret; | |
585 | ||
586 | case PPWCTLONIRQ: | |
587 | if (copy_from_user (®, argp, sizeof (reg))) | |
588 | return -EFAULT; | |
589 | ||
590 | /* Remember what to set the control lines to, for next | |
591 | * time we get an interrupt. */ | |
592 | pp->irqctl = reg; | |
593 | pp->irqresponse = 1; | |
594 | return 0; | |
595 | ||
596 | case PPCLRIRQ: | |
597 | ret = atomic_read (&pp->irqc); | |
598 | if (copy_to_user (argp, &ret, sizeof (ret))) | |
599 | return -EFAULT; | |
600 | atomic_sub (ret, &pp->irqc); | |
601 | return 0; | |
602 | ||
603 | case PPSETTIME: | |
604 | if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { | |
605 | return -EFAULT; | |
606 | } | |
607 | /* Convert to jiffies, place in pp->pdev->timeout */ | |
608 | if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { | |
609 | return -EINVAL; | |
610 | } | |
611 | to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); | |
612 | to_jiffies += par_timeout.tv_sec * (long)HZ; | |
613 | if (to_jiffies <= 0) { | |
614 | return -EINVAL; | |
615 | } | |
616 | pp->pdev->timeout = to_jiffies; | |
617 | return 0; | |
618 | ||
619 | case PPGETTIME: | |
620 | to_jiffies = pp->pdev->timeout; | |
621 | par_timeout.tv_sec = to_jiffies / HZ; | |
622 | par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); | |
623 | if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) | |
624 | return -EFAULT; | |
625 | return 0; | |
626 | ||
627 | default: | |
628 | printk (KERN_DEBUG CHRDEV "%x: What? (cmd=0x%x)\n", minor, | |
629 | cmd); | |
630 | return -EINVAL; | |
631 | } | |
632 | ||
633 | /* Keep the compiler happy */ | |
634 | return 0; | |
635 | } | |
636 | ||
637 | static int pp_open (struct inode * inode, struct file * file) | |
638 | { | |
639 | unsigned int minor = iminor(inode); | |
640 | struct pp_struct *pp; | |
641 | ||
642 | if (minor >= PARPORT_MAX) | |
643 | return -ENXIO; | |
644 | ||
645 | pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); | |
646 | if (!pp) | |
647 | return -ENOMEM; | |
648 | ||
649 | pp->state.mode = IEEE1284_MODE_COMPAT; | |
650 | pp->state.phase = init_phase (pp->state.mode); | |
651 | pp->flags = 0; | |
652 | pp->irqresponse = 0; | |
653 | atomic_set (&pp->irqc, 0); | |
654 | init_waitqueue_head (&pp->irq_wait); | |
655 | ||
656 | /* Defer the actual device registration until the first claim. | |
657 | * That way, we know whether or not the driver wants to have | |
658 | * exclusive access to the port (PPEXCL). | |
659 | */ | |
660 | pp->pdev = NULL; | |
661 | file->private_data = pp; | |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
666 | static int pp_release (struct inode * inode, struct file * file) | |
667 | { | |
668 | unsigned int minor = iminor(inode); | |
669 | struct pp_struct *pp = file->private_data; | |
670 | int compat_negot; | |
671 | ||
672 | compat_negot = 0; | |
673 | if (!(pp->flags & PP_CLAIMED) && pp->pdev && | |
674 | (pp->state.mode != IEEE1284_MODE_COMPAT)) { | |
675 | struct ieee1284_info *info; | |
676 | ||
677 | /* parport released, but not in compatibility mode */ | |
678 | parport_claim_or_block (pp->pdev); | |
679 | pp->flags |= PP_CLAIMED; | |
680 | info = &pp->pdev->port->ieee1284; | |
681 | pp->saved_state.mode = info->mode; | |
682 | pp->saved_state.phase = info->phase; | |
683 | info->mode = pp->state.mode; | |
684 | info->phase = pp->state.phase; | |
685 | compat_negot = 1; | |
686 | } else if ((pp->flags & PP_CLAIMED) && pp->pdev && | |
687 | (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { | |
688 | compat_negot = 2; | |
689 | } | |
690 | if (compat_negot) { | |
691 | parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); | |
692 | printk (KERN_DEBUG CHRDEV | |
693 | "%x: negotiated back to compatibility mode because " | |
694 | "user-space forgot\n", minor); | |
695 | } | |
696 | ||
697 | if (pp->flags & PP_CLAIMED) { | |
698 | struct ieee1284_info *info; | |
699 | ||
700 | info = &pp->pdev->port->ieee1284; | |
701 | pp->state.mode = info->mode; | |
702 | pp->state.phase = info->phase; | |
703 | info->mode = pp->saved_state.mode; | |
704 | info->phase = pp->saved_state.phase; | |
705 | parport_release (pp->pdev); | |
706 | if (compat_negot != 1) { | |
707 | printk (KERN_DEBUG CHRDEV "%x: released pardevice " | |
708 | "because user-space forgot\n", minor); | |
709 | } | |
710 | } | |
711 | ||
712 | if (pp->pdev) { | |
713 | const char *name = pp->pdev->name; | |
714 | parport_unregister_device (pp->pdev); | |
715 | kfree (name); | |
716 | pp->pdev = NULL; | |
717 | printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n", | |
718 | minor); | |
719 | } | |
720 | ||
721 | kfree (pp); | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
726 | /* No kernel lock held - fine */ | |
727 | static unsigned int pp_poll (struct file * file, poll_table * wait) | |
728 | { | |
729 | struct pp_struct *pp = file->private_data; | |
730 | unsigned int mask = 0; | |
731 | ||
732 | poll_wait (file, &pp->irq_wait, wait); | |
733 | if (atomic_read (&pp->irqc)) | |
734 | mask |= POLLIN | POLLRDNORM; | |
735 | ||
736 | return mask; | |
737 | } | |
738 | ||
ca8eca68 | 739 | static struct class *ppdev_class; |
1da177e4 | 740 | |
62322d25 | 741 | static const struct file_operations pp_fops = { |
1da177e4 LT |
742 | .owner = THIS_MODULE, |
743 | .llseek = no_llseek, | |
744 | .read = pp_read, | |
745 | .write = pp_write, | |
746 | .poll = pp_poll, | |
747 | .ioctl = pp_ioctl, | |
748 | .open = pp_open, | |
749 | .release = pp_release, | |
750 | }; | |
751 | ||
752 | static void pp_attach(struct parport *port) | |
753 | { | |
da675296 | 754 | device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), |
04880eda | 755 | "parport%d", port->number); |
1da177e4 LT |
756 | } |
757 | ||
758 | static void pp_detach(struct parport *port) | |
759 | { | |
04880eda | 760 | device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); |
1da177e4 LT |
761 | } |
762 | ||
763 | static struct parport_driver pp_driver = { | |
764 | .name = CHRDEV, | |
765 | .attach = pp_attach, | |
766 | .detach = pp_detach, | |
767 | }; | |
768 | ||
769 | static int __init ppdev_init (void) | |
770 | { | |
8ab5e4c1 | 771 | int err = 0; |
1da177e4 LT |
772 | |
773 | if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) { | |
774 | printk (KERN_WARNING CHRDEV ": unable to get major %d\n", | |
775 | PP_MAJOR); | |
776 | return -EIO; | |
777 | } | |
ca8eca68 | 778 | ppdev_class = class_create(THIS_MODULE, CHRDEV); |
1da177e4 LT |
779 | if (IS_ERR(ppdev_class)) { |
780 | err = PTR_ERR(ppdev_class); | |
781 | goto out_chrdev; | |
782 | } | |
1da177e4 LT |
783 | if (parport_register_driver(&pp_driver)) { |
784 | printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); | |
785 | goto out_class; | |
786 | } | |
787 | ||
788 | printk (KERN_INFO PP_VERSION "\n"); | |
789 | goto out; | |
790 | ||
791 | out_class: | |
ca8eca68 | 792 | class_destroy(ppdev_class); |
1da177e4 LT |
793 | out_chrdev: |
794 | unregister_chrdev(PP_MAJOR, CHRDEV); | |
795 | out: | |
796 | return err; | |
797 | } | |
798 | ||
799 | static void __exit ppdev_cleanup (void) | |
800 | { | |
1da177e4 | 801 | /* Clean up all parport stuff */ |
1da177e4 | 802 | parport_unregister_driver(&pp_driver); |
ca8eca68 | 803 | class_destroy(ppdev_class); |
1da177e4 LT |
804 | unregister_chrdev (PP_MAJOR, CHRDEV); |
805 | } | |
806 | ||
807 | module_init(ppdev_init); | |
808 | module_exit(ppdev_cleanup); | |
809 | ||
810 | MODULE_LICENSE("GPL"); | |
811 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |