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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> |
e6a67846 | 69 | #include <asm/uaccess.h> |
1da177e4 LT |
70 | |
71 | #define PP_VERSION "ppdev: user-space parallel port driver" | |
72 | #define CHRDEV "ppdev" | |
73 | ||
74 | struct 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 | /* pp_struct.flags bitfields */ | |
87 | #define PP_CLAIMED (1<<0) | |
88 | #define PP_EXCL (1<<1) | |
89 | ||
90 | /* Other constants */ | |
91 | #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ | |
92 | #define PP_BUFFER_SIZE 1024 | |
93 | #define PARDEVICE_MAX 8 | |
94 | ||
95 | /* ROUND_UP macro from fs/select.c */ | |
96 | #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) | |
97 | ||
98 | static 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 | ||
104 | static ssize_t pp_read (struct file * file, char __user * buf, size_t count, | |
105 | loff_t * ppos) | |
106 | { | |
a7113a96 | 107 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
1da177e4 LT |
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 | /* Don't have the port claimed */ | |
116 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", | |
117 | minor); | |
118 | return -EINVAL; | |
119 | } | |
120 | ||
121 | /* Trivial case. */ | |
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 | /* various specials for EPP mode */ | |
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 | ||
187 | static ssize_t pp_write (struct file * file, const char __user * buf, | |
188 | size_t count, loff_t * ppos) | |
189 | { | |
a7113a96 | 190 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
1da177e4 LT |
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 | /* Don't have the port claimed */ | |
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 | /* do a fast EPP write */ | |
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 | ||
5712cb3d | 270 | static void pp_irq (void *private) |
1da177e4 | 271 | { |
5712cb3d | 272 | struct pp_struct *pp = private; |
1da177e4 LT |
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 | ||
283 | static 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 | ||
319 | static 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 | ||
330 | static 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 | /* First handle the cases that don't take arguments. */ | |
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 | /* Deferred device registration. */ | |
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 | /* For interrupt-reporting to work, we need to be | |
366 | * informed of each interrupt. */ | |
367 | pp_enable_irq (pp); | |
368 | ||
369 | /* We may need to fix up the state machine. */ | |
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 | /* But it's not really an error. */ | |
386 | return 0; | |
387 | /* There's no chance of making the driver happy. */ | |
388 | return -EINVAL; | |
389 | } | |
390 | ||
391 | /* Just remember to register the device exclusively | |
392 | * when we finally do the registration. */ | |
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 | /* FIXME: validate mode */ | |
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 | /* FIXME: validate phase */ | |
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 | } /* end switch() */ | |
490 | ||
491 | /* Everything else requires the port to be claimed, so check | |
492 | * that now. */ | |
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 | /* Save the state machine's state. */ | |
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: /* handshake failed, peripheral not IEEE 1284 */ | |
576 | ret = -EIO; | |
577 | break; | |
578 | case 1: /* handshake succeeded, peripheral rejected mode */ | |
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 | /* Remember what to set the control lines to, for next | |
590 | * time we get an interrupt. */ | |
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 | /* Convert to jiffies, place in pp->pdev->timeout */ | |
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 | /* Keep the compiler happy */ | |
633 | return 0; | |
634 | } | |
635 | ||
636 | static 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 | /* Defer the actual device registration until the first claim. | |
656 | * That way, we know whether or not the driver wants to have | |
657 | * exclusive access to the port (PPEXCL). | |
658 | */ | |
659 | pp->pdev = NULL; | |
660 | file->private_data = pp; | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | static 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 | /* parport released, but not in compatibility mode */ | |
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 | /* No kernel lock held - fine */ | |
726 | static 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 | ||
ca8eca68 | 738 | static struct class *ppdev_class; |
1da177e4 | 739 | |
62322d25 | 740 | static const struct file_operations pp_fops = { |
1da177e4 LT |
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 | ||
751 | static void pp_attach(struct parport *port) | |
752 | { | |
da675296 | 753 | device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), |
04880eda | 754 | "parport%d", port->number); |
1da177e4 LT |
755 | } |
756 | ||
757 | static void pp_detach(struct parport *port) | |
758 | { | |
04880eda | 759 | device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); |
1da177e4 LT |
760 | } |
761 | ||
762 | static struct parport_driver pp_driver = { | |
763 | .name = CHRDEV, | |
764 | .attach = pp_attach, | |
765 | .detach = pp_detach, | |
766 | }; | |
767 | ||
768 | static int __init ppdev_init (void) | |
769 | { | |
8ab5e4c1 | 770 | int err = 0; |
1da177e4 LT |
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 | } | |
ca8eca68 | 777 | ppdev_class = class_create(THIS_MODULE, CHRDEV); |
1da177e4 LT |
778 | if (IS_ERR(ppdev_class)) { |
779 | err = PTR_ERR(ppdev_class); | |
780 | goto out_chrdev; | |
781 | } | |
1da177e4 LT |
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 | ||
790 | out_class: | |
ca8eca68 | 791 | class_destroy(ppdev_class); |
1da177e4 LT |
792 | out_chrdev: |
793 | unregister_chrdev(PP_MAJOR, CHRDEV); | |
794 | out: | |
795 | return err; | |
796 | } | |
797 | ||
798 | static void __exit ppdev_cleanup (void) | |
799 | { | |
1da177e4 | 800 | /* Clean up all parport stuff */ |
1da177e4 | 801 | parport_unregister_driver(&pp_driver); |
ca8eca68 | 802 | class_destroy(ppdev_class); |
1da177e4 LT |
803 | unregister_chrdev (PP_MAJOR, CHRDEV); |
804 | } | |
805 | ||
806 | module_init(ppdev_init); | |
807 | module_exit(ppdev_cleanup); | |
808 | ||
809 | MODULE_LICENSE("GPL"); | |
810 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |