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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> | |
5a0e3ad6 | 67 | #include <linux/slab.h> |
e6a67846 | 68 | #include <linux/major.h> |
1da177e4 | 69 | #include <linux/ppdev.h> |
613655fa | 70 | #include <linux/mutex.h> |
6d535d3e | 71 | #include <linux/uaccess.h> |
1da177e4 LT |
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 | ||
613655fa | 100 | static DEFINE_MUTEX(pp_do_mutex); |
1da177e4 LT |
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 | { | |
a7113a96 | 110 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
1da177e4 LT |
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 */ | |
81fc401e | 119 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
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 | { | |
a7113a96 | 192 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
1da177e4 LT |
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 */ | |
81fc401e | 202 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
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 | ||
5712cb3d | 271 | static void pp_irq (void *private) |
1da177e4 | 272 | { |
5712cb3d | 273 | struct pp_struct *pp = private; |
1da177e4 LT |
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 | ||
87575437 | 291 | name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); |
1da177e4 LT |
292 | if (name == NULL) |
293 | return -ENOMEM; | |
294 | ||
1da177e4 LT |
295 | port = parport_find_number (minor); |
296 | if (!port) { | |
297 | printk (KERN_WARNING "%s: no associated port!\n", name); | |
298 | kfree (name); | |
299 | return -ENXIO; | |
300 | } | |
301 | ||
302 | fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; | |
303 | pdev = parport_register_device (port, name, NULL, | |
304 | NULL, pp_irq, fl, pp); | |
305 | parport_put_port (port); | |
306 | ||
307 | if (!pdev) { | |
308 | printk (KERN_WARNING "%s: failed to register device!\n", name); | |
309 | kfree (name); | |
310 | return -ENXIO; | |
311 | } | |
312 | ||
313 | pp->pdev = pdev; | |
81fc401e | 314 | pr_debug("%s: registered pardevice\n", name); |
1da177e4 LT |
315 | return 0; |
316 | } | |
317 | ||
318 | static enum ieee1284_phase init_phase (int mode) | |
319 | { | |
320 | switch (mode & ~(IEEE1284_DEVICEID | |
321 | | IEEE1284_ADDR)) { | |
322 | case IEEE1284_MODE_NIBBLE: | |
323 | case IEEE1284_MODE_BYTE: | |
324 | return IEEE1284_PH_REV_IDLE; | |
325 | } | |
326 | return IEEE1284_PH_FWD_IDLE; | |
327 | } | |
328 | ||
6d535d3e | 329 | static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 | 330 | { |
6d535d3e | 331 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
1da177e4 LT |
332 | struct pp_struct *pp = file->private_data; |
333 | struct parport * port; | |
334 | void __user *argp = (void __user *)arg; | |
335 | ||
336 | /* First handle the cases that don't take arguments. */ | |
337 | switch (cmd) { | |
338 | case PPCLAIM: | |
339 | { | |
340 | struct ieee1284_info *info; | |
341 | int ret; | |
342 | ||
343 | if (pp->flags & PP_CLAIMED) { | |
81fc401e | 344 | pr_debug(CHRDEV "%x: you've already got it!\n", minor); |
1da177e4 LT |
345 | return -EINVAL; |
346 | } | |
347 | ||
348 | /* Deferred device registration. */ | |
349 | if (!pp->pdev) { | |
350 | int err = register_device (minor, pp); | |
351 | if (err) { | |
352 | return err; | |
353 | } | |
354 | } | |
355 | ||
356 | ret = parport_claim_or_block (pp->pdev); | |
357 | if (ret < 0) | |
358 | return ret; | |
359 | ||
360 | pp->flags |= PP_CLAIMED; | |
361 | ||
362 | /* For interrupt-reporting to work, we need to be | |
363 | * informed of each interrupt. */ | |
364 | pp_enable_irq (pp); | |
365 | ||
366 | /* We may need to fix up the state machine. */ | |
367 | info = &pp->pdev->port->ieee1284; | |
368 | pp->saved_state.mode = info->mode; | |
369 | pp->saved_state.phase = info->phase; | |
370 | info->mode = pp->state.mode; | |
371 | info->phase = pp->state.phase; | |
372 | pp->default_inactivity = parport_set_timeout (pp->pdev, 0); | |
373 | parport_set_timeout (pp->pdev, pp->default_inactivity); | |
374 | ||
375 | return 0; | |
376 | } | |
377 | case PPEXCL: | |
378 | if (pp->pdev) { | |
81fc401e | 379 | pr_debug(CHRDEV "%x: too late for PPEXCL; " |
1da177e4 LT |
380 | "already registered\n", minor); |
381 | if (pp->flags & PP_EXCL) | |
382 | /* But it's not really an error. */ | |
383 | return 0; | |
384 | /* There's no chance of making the driver happy. */ | |
385 | return -EINVAL; | |
386 | } | |
387 | ||
388 | /* Just remember to register the device exclusively | |
389 | * when we finally do the registration. */ | |
390 | pp->flags |= PP_EXCL; | |
391 | return 0; | |
392 | case PPSETMODE: | |
393 | { | |
394 | int mode; | |
395 | if (copy_from_user (&mode, argp, sizeof (mode))) | |
396 | return -EFAULT; | |
397 | /* FIXME: validate mode */ | |
398 | pp->state.mode = mode; | |
399 | pp->state.phase = init_phase (mode); | |
400 | ||
401 | if (pp->flags & PP_CLAIMED) { | |
402 | pp->pdev->port->ieee1284.mode = mode; | |
403 | pp->pdev->port->ieee1284.phase = pp->state.phase; | |
404 | } | |
405 | ||
406 | return 0; | |
407 | } | |
408 | case PPGETMODE: | |
409 | { | |
410 | int mode; | |
411 | ||
412 | if (pp->flags & PP_CLAIMED) { | |
413 | mode = pp->pdev->port->ieee1284.mode; | |
414 | } else { | |
415 | mode = pp->state.mode; | |
416 | } | |
417 | if (copy_to_user (argp, &mode, sizeof (mode))) { | |
418 | return -EFAULT; | |
419 | } | |
420 | return 0; | |
421 | } | |
422 | case PPSETPHASE: | |
423 | { | |
424 | int phase; | |
425 | if (copy_from_user (&phase, argp, sizeof (phase))) { | |
426 | return -EFAULT; | |
427 | } | |
428 | /* FIXME: validate phase */ | |
429 | pp->state.phase = phase; | |
430 | ||
431 | if (pp->flags & PP_CLAIMED) { | |
432 | pp->pdev->port->ieee1284.phase = phase; | |
433 | } | |
434 | ||
435 | return 0; | |
436 | } | |
437 | case PPGETPHASE: | |
438 | { | |
439 | int phase; | |
440 | ||
441 | if (pp->flags & PP_CLAIMED) { | |
442 | phase = pp->pdev->port->ieee1284.phase; | |
443 | } else { | |
444 | phase = pp->state.phase; | |
445 | } | |
446 | if (copy_to_user (argp, &phase, sizeof (phase))) { | |
447 | return -EFAULT; | |
448 | } | |
449 | return 0; | |
450 | } | |
451 | case PPGETMODES: | |
452 | { | |
453 | unsigned int modes; | |
454 | ||
455 | port = parport_find_number (minor); | |
456 | if (!port) | |
457 | return -ENODEV; | |
458 | ||
459 | modes = port->modes; | |
d98808a2 | 460 | parport_put_port(port); |
1da177e4 LT |
461 | if (copy_to_user (argp, &modes, sizeof (modes))) { |
462 | return -EFAULT; | |
463 | } | |
464 | return 0; | |
465 | } | |
466 | case PPSETFLAGS: | |
467 | { | |
468 | int uflags; | |
469 | ||
470 | if (copy_from_user (&uflags, argp, sizeof (uflags))) { | |
471 | return -EFAULT; | |
472 | } | |
473 | pp->flags &= ~PP_FLAGMASK; | |
474 | pp->flags |= (uflags & PP_FLAGMASK); | |
475 | return 0; | |
476 | } | |
477 | case PPGETFLAGS: | |
478 | { | |
479 | int uflags; | |
480 | ||
481 | uflags = pp->flags & PP_FLAGMASK; | |
482 | if (copy_to_user (argp, &uflags, sizeof (uflags))) { | |
483 | return -EFAULT; | |
484 | } | |
485 | return 0; | |
486 | } | |
487 | } /* end switch() */ | |
488 | ||
489 | /* Everything else requires the port to be claimed, so check | |
490 | * that now. */ | |
491 | if ((pp->flags & PP_CLAIMED) == 0) { | |
81fc401e | 492 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
493 | return -EINVAL; |
494 | } | |
495 | ||
496 | port = pp->pdev->port; | |
497 | switch (cmd) { | |
498 | struct ieee1284_info *info; | |
499 | unsigned char reg; | |
500 | unsigned char mask; | |
501 | int mode; | |
502 | int ret; | |
503 | struct timeval par_timeout; | |
504 | long to_jiffies; | |
505 | ||
506 | case PPRSTATUS: | |
507 | reg = parport_read_status (port); | |
508 | if (copy_to_user (argp, ®, sizeof (reg))) | |
509 | return -EFAULT; | |
510 | return 0; | |
511 | case PPRDATA: | |
512 | reg = parport_read_data (port); | |
513 | if (copy_to_user (argp, ®, sizeof (reg))) | |
514 | return -EFAULT; | |
515 | return 0; | |
516 | case PPRCONTROL: | |
517 | reg = parport_read_control (port); | |
518 | if (copy_to_user (argp, ®, sizeof (reg))) | |
519 | return -EFAULT; | |
520 | return 0; | |
521 | case PPYIELD: | |
522 | parport_yield_blocking (pp->pdev); | |
523 | return 0; | |
524 | ||
525 | case PPRELEASE: | |
526 | /* Save the state machine's state. */ | |
527 | info = &pp->pdev->port->ieee1284; | |
528 | pp->state.mode = info->mode; | |
529 | pp->state.phase = info->phase; | |
530 | info->mode = pp->saved_state.mode; | |
531 | info->phase = pp->saved_state.phase; | |
532 | parport_release (pp->pdev); | |
533 | pp->flags &= ~PP_CLAIMED; | |
534 | return 0; | |
535 | ||
536 | case PPWCONTROL: | |
537 | if (copy_from_user (®, argp, sizeof (reg))) | |
538 | return -EFAULT; | |
539 | parport_write_control (port, reg); | |
540 | return 0; | |
541 | ||
542 | case PPWDATA: | |
543 | if (copy_from_user (®, argp, sizeof (reg))) | |
544 | return -EFAULT; | |
545 | parport_write_data (port, reg); | |
546 | return 0; | |
547 | ||
548 | case PPFCONTROL: | |
549 | if (copy_from_user (&mask, argp, | |
550 | sizeof (mask))) | |
551 | return -EFAULT; | |
552 | if (copy_from_user (®, 1 + (unsigned char __user *) arg, | |
553 | sizeof (reg))) | |
554 | return -EFAULT; | |
555 | parport_frob_control (port, mask, reg); | |
556 | return 0; | |
557 | ||
558 | case PPDATADIR: | |
559 | if (copy_from_user (&mode, argp, sizeof (mode))) | |
560 | return -EFAULT; | |
561 | if (mode) | |
562 | port->ops->data_reverse (port); | |
563 | else | |
564 | port->ops->data_forward (port); | |
565 | return 0; | |
566 | ||
567 | case PPNEGOT: | |
568 | if (copy_from_user (&mode, argp, sizeof (mode))) | |
569 | return -EFAULT; | |
570 | switch ((ret = parport_negotiate (port, mode))) { | |
571 | case 0: break; | |
572 | case -1: /* handshake failed, peripheral not IEEE 1284 */ | |
573 | ret = -EIO; | |
574 | break; | |
575 | case 1: /* handshake succeeded, peripheral rejected mode */ | |
576 | ret = -ENXIO; | |
577 | break; | |
578 | } | |
579 | pp_enable_irq (pp); | |
580 | return ret; | |
581 | ||
582 | case PPWCTLONIRQ: | |
583 | if (copy_from_user (®, argp, sizeof (reg))) | |
584 | return -EFAULT; | |
585 | ||
586 | /* Remember what to set the control lines to, for next | |
587 | * time we get an interrupt. */ | |
588 | pp->irqctl = reg; | |
589 | pp->irqresponse = 1; | |
590 | return 0; | |
591 | ||
592 | case PPCLRIRQ: | |
593 | ret = atomic_read (&pp->irqc); | |
594 | if (copy_to_user (argp, &ret, sizeof (ret))) | |
595 | return -EFAULT; | |
596 | atomic_sub (ret, &pp->irqc); | |
597 | return 0; | |
598 | ||
599 | case PPSETTIME: | |
600 | if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { | |
601 | return -EFAULT; | |
602 | } | |
603 | /* Convert to jiffies, place in pp->pdev->timeout */ | |
604 | if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { | |
605 | return -EINVAL; | |
606 | } | |
607 | to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); | |
608 | to_jiffies += par_timeout.tv_sec * (long)HZ; | |
609 | if (to_jiffies <= 0) { | |
610 | return -EINVAL; | |
611 | } | |
612 | pp->pdev->timeout = to_jiffies; | |
613 | return 0; | |
614 | ||
615 | case PPGETTIME: | |
616 | to_jiffies = pp->pdev->timeout; | |
b9b11342 | 617 | memset(&par_timeout, 0, sizeof(par_timeout)); |
1da177e4 LT |
618 | par_timeout.tv_sec = to_jiffies / HZ; |
619 | par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); | |
620 | if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) | |
621 | return -EFAULT; | |
622 | return 0; | |
623 | ||
624 | default: | |
81fc401e | 625 | pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd); |
1da177e4 LT |
626 | return -EINVAL; |
627 | } | |
628 | ||
629 | /* Keep the compiler happy */ | |
630 | return 0; | |
631 | } | |
632 | ||
6d535d3e AC |
633 | static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
634 | { | |
635 | long ret; | |
613655fa | 636 | mutex_lock(&pp_do_mutex); |
6d535d3e | 637 | ret = pp_do_ioctl(file, cmd, arg); |
613655fa | 638 | mutex_unlock(&pp_do_mutex); |
6d535d3e AC |
639 | return ret; |
640 | } | |
641 | ||
1da177e4 LT |
642 | static int pp_open (struct inode * inode, struct file * file) |
643 | { | |
644 | unsigned int minor = iminor(inode); | |
645 | struct pp_struct *pp; | |
646 | ||
647 | if (minor >= PARPORT_MAX) | |
648 | return -ENXIO; | |
649 | ||
650 | pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); | |
651 | if (!pp) | |
652 | return -ENOMEM; | |
653 | ||
654 | pp->state.mode = IEEE1284_MODE_COMPAT; | |
655 | pp->state.phase = init_phase (pp->state.mode); | |
656 | pp->flags = 0; | |
657 | pp->irqresponse = 0; | |
658 | atomic_set (&pp->irqc, 0); | |
659 | init_waitqueue_head (&pp->irq_wait); | |
660 | ||
661 | /* Defer the actual device registration until the first claim. | |
662 | * That way, we know whether or not the driver wants to have | |
663 | * exclusive access to the port (PPEXCL). | |
664 | */ | |
665 | pp->pdev = NULL; | |
666 | file->private_data = pp; | |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
671 | static int pp_release (struct inode * inode, struct file * file) | |
672 | { | |
673 | unsigned int minor = iminor(inode); | |
674 | struct pp_struct *pp = file->private_data; | |
675 | int compat_negot; | |
676 | ||
677 | compat_negot = 0; | |
678 | if (!(pp->flags & PP_CLAIMED) && pp->pdev && | |
679 | (pp->state.mode != IEEE1284_MODE_COMPAT)) { | |
680 | struct ieee1284_info *info; | |
681 | ||
682 | /* parport released, but not in compatibility mode */ | |
683 | parport_claim_or_block (pp->pdev); | |
684 | pp->flags |= PP_CLAIMED; | |
685 | info = &pp->pdev->port->ieee1284; | |
686 | pp->saved_state.mode = info->mode; | |
687 | pp->saved_state.phase = info->phase; | |
688 | info->mode = pp->state.mode; | |
689 | info->phase = pp->state.phase; | |
690 | compat_negot = 1; | |
691 | } else if ((pp->flags & PP_CLAIMED) && pp->pdev && | |
692 | (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { | |
693 | compat_negot = 2; | |
694 | } | |
695 | if (compat_negot) { | |
696 | parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); | |
81fc401e MB |
697 | pr_debug(CHRDEV "%x: negotiated back to compatibility " |
698 | "mode because user-space forgot\n", minor); | |
1da177e4 LT |
699 | } |
700 | ||
701 | if (pp->flags & PP_CLAIMED) { | |
702 | struct ieee1284_info *info; | |
703 | ||
704 | info = &pp->pdev->port->ieee1284; | |
705 | pp->state.mode = info->mode; | |
706 | pp->state.phase = info->phase; | |
707 | info->mode = pp->saved_state.mode; | |
708 | info->phase = pp->saved_state.phase; | |
709 | parport_release (pp->pdev); | |
710 | if (compat_negot != 1) { | |
81fc401e | 711 | pr_debug(CHRDEV "%x: released pardevice " |
1da177e4 LT |
712 | "because user-space forgot\n", minor); |
713 | } | |
714 | } | |
715 | ||
716 | if (pp->pdev) { | |
717 | const char *name = pp->pdev->name; | |
718 | parport_unregister_device (pp->pdev); | |
719 | kfree (name); | |
720 | pp->pdev = NULL; | |
81fc401e | 721 | pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); |
1da177e4 LT |
722 | } |
723 | ||
724 | kfree (pp); | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
729 | /* No kernel lock held - fine */ | |
730 | static unsigned int pp_poll (struct file * file, poll_table * wait) | |
731 | { | |
732 | struct pp_struct *pp = file->private_data; | |
733 | unsigned int mask = 0; | |
734 | ||
735 | poll_wait (file, &pp->irq_wait, wait); | |
736 | if (atomic_read (&pp->irqc)) | |
737 | mask |= POLLIN | POLLRDNORM; | |
738 | ||
739 | return mask; | |
740 | } | |
741 | ||
ca8eca68 | 742 | static struct class *ppdev_class; |
1da177e4 | 743 | |
62322d25 | 744 | static const struct file_operations pp_fops = { |
1da177e4 LT |
745 | .owner = THIS_MODULE, |
746 | .llseek = no_llseek, | |
747 | .read = pp_read, | |
748 | .write = pp_write, | |
749 | .poll = pp_poll, | |
6d535d3e | 750 | .unlocked_ioctl = pp_ioctl, |
1da177e4 LT |
751 | .open = pp_open, |
752 | .release = pp_release, | |
753 | }; | |
754 | ||
755 | static void pp_attach(struct parport *port) | |
756 | { | |
03457cd4 GKH |
757 | device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), |
758 | NULL, "parport%d", port->number); | |
1da177e4 LT |
759 | } |
760 | ||
761 | static void pp_detach(struct parport *port) | |
762 | { | |
04880eda | 763 | device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); |
1da177e4 LT |
764 | } |
765 | ||
766 | static struct parport_driver pp_driver = { | |
767 | .name = CHRDEV, | |
768 | .attach = pp_attach, | |
769 | .detach = pp_detach, | |
770 | }; | |
771 | ||
772 | static int __init ppdev_init (void) | |
773 | { | |
8ab5e4c1 | 774 | int err = 0; |
1da177e4 LT |
775 | |
776 | if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) { | |
777 | printk (KERN_WARNING CHRDEV ": unable to get major %d\n", | |
778 | PP_MAJOR); | |
779 | return -EIO; | |
780 | } | |
ca8eca68 | 781 | ppdev_class = class_create(THIS_MODULE, CHRDEV); |
1da177e4 LT |
782 | if (IS_ERR(ppdev_class)) { |
783 | err = PTR_ERR(ppdev_class); | |
784 | goto out_chrdev; | |
785 | } | |
1da177e4 LT |
786 | if (parport_register_driver(&pp_driver)) { |
787 | printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); | |
788 | goto out_class; | |
789 | } | |
790 | ||
791 | printk (KERN_INFO PP_VERSION "\n"); | |
792 | goto out; | |
793 | ||
794 | out_class: | |
ca8eca68 | 795 | class_destroy(ppdev_class); |
1da177e4 LT |
796 | out_chrdev: |
797 | unregister_chrdev(PP_MAJOR, CHRDEV); | |
798 | out: | |
799 | return err; | |
800 | } | |
801 | ||
802 | static void __exit ppdev_cleanup (void) | |
803 | { | |
1da177e4 | 804 | /* Clean up all parport stuff */ |
1da177e4 | 805 | parport_unregister_driver(&pp_driver); |
ca8eca68 | 806 | class_destroy(ppdev_class); |
1da177e4 LT |
807 | unregister_chrdev (PP_MAJOR, CHRDEV); |
808 | } | |
809 | ||
810 | module_init(ppdev_init); | |
811 | module_exit(ppdev_cleanup); | |
812 | ||
813 | MODULE_LICENSE("GPL"); | |
814 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |