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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/ioctl.h> |
64 | #include <linux/parport.h> |
65 | #include <linux/ctype.h> |
66 | #include <linux/poll.h> |
67 | #include <linux/slab.h> |
68 | #include <linux/major.h> |
69 | #include <linux/ppdev.h> |
70 | #include <linux/smp_lock.h> |
71 | #include <linux/uaccess.h> |
72 | |
73 | #define PP_VERSION "ppdev: user-space parallel port driver" |
74 | #define CHRDEV "ppdev" |
75 | |
76 | struct pp_struct { |
77 | struct pardevice * pdev; |
78 | wait_queue_head_t irq_wait; |
79 | atomic_t irqc; |
80 | unsigned int flags; |
81 | int irqresponse; |
82 | unsigned char irqctl; |
83 | struct ieee1284_info state; |
84 | struct ieee1284_info saved_state; |
85 | long default_inactivity; |
86 | }; |
87 | |
88 | /* pp_struct.flags bitfields */ |
89 | #define PP_CLAIMED (1<<0) |
90 | #define PP_EXCL (1<<1) |
91 | |
92 | /* Other constants */ |
93 | #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ |
94 | #define PP_BUFFER_SIZE 1024 |
95 | #define PARDEVICE_MAX 8 |
96 | |
97 | /* ROUND_UP macro from fs/select.c */ |
98 | #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) |
99 | |
100 | static inline void pp_enable_irq (struct pp_struct *pp) |
101 | { |
102 | struct parport *port = pp->pdev->port; |
103 | port->ops->enable_irq (port); |
104 | } |
105 | |
106 | static ssize_t pp_read (struct file * file, char __user * buf, size_t count, |
107 | loff_t * ppos) |
108 | { |
109 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
110 | struct pp_struct *pp = file->private_data; |
111 | char * kbuffer; |
112 | ssize_t bytes_read = 0; |
113 | struct parport *pport; |
114 | int mode; |
115 | |
116 | if (!(pp->flags & PP_CLAIMED)) { |
117 | /* Don't have the port claimed */ |
118 | pr_debug(CHRDEV "%x: claim the port first\n", 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 | { |
191 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
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 | pr_debug(CHRDEV "%x: claim the port first\n", 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 | |
270 | static void pp_irq (void *private) |
271 | { |
272 | struct pp_struct *pp = private; |
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 | pr_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_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
331 | { |
332 | unsigned int minor = iminor(file->f_path.dentry->d_inode); |
333 | struct pp_struct *pp = file->private_data; |
334 | struct parport * port; |
335 | void __user *argp = (void __user *)arg; |
336 | |
337 | /* First handle the cases that don't take arguments. */ |
338 | switch (cmd) { |
339 | case PPCLAIM: |
340 | { |
341 | struct ieee1284_info *info; |
342 | int ret; |
343 | |
344 | if (pp->flags & PP_CLAIMED) { |
345 | pr_debug(CHRDEV "%x: you've already got it!\n", minor); |
346 | return -EINVAL; |
347 | } |
348 | |
349 | /* Deferred device registration. */ |
350 | if (!pp->pdev) { |
351 | int err = register_device (minor, pp); |
352 | if (err) { |
353 | return err; |
354 | } |
355 | } |
356 | |
357 | ret = parport_claim_or_block (pp->pdev); |
358 | if (ret < 0) |
359 | return ret; |
360 | |
361 | pp->flags |= PP_CLAIMED; |
362 | |
363 | /* For interrupt-reporting to work, we need to be |
364 | * informed of each interrupt. */ |
365 | pp_enable_irq (pp); |
366 | |
367 | /* We may need to fix up the state machine. */ |
368 | info = &pp->pdev->port->ieee1284; |
369 | pp->saved_state.mode = info->mode; |
370 | pp->saved_state.phase = info->phase; |
371 | info->mode = pp->state.mode; |
372 | info->phase = pp->state.phase; |
373 | pp->default_inactivity = parport_set_timeout (pp->pdev, 0); |
374 | parport_set_timeout (pp->pdev, pp->default_inactivity); |
375 | |
376 | return 0; |
377 | } |
378 | case PPEXCL: |
379 | if (pp->pdev) { |
380 | pr_debug(CHRDEV "%x: too late for PPEXCL; " |
381 | "already registered\n", minor); |
382 | if (pp->flags & PP_EXCL) |
383 | /* But it's not really an error. */ |
384 | return 0; |
385 | /* There's no chance of making the driver happy. */ |
386 | return -EINVAL; |
387 | } |
388 | |
389 | /* Just remember to register the device exclusively |
390 | * when we finally do the registration. */ |
391 | pp->flags |= PP_EXCL; |
392 | return 0; |
393 | case PPSETMODE: |
394 | { |
395 | int mode; |
396 | if (copy_from_user (&mode, argp, sizeof (mode))) |
397 | return -EFAULT; |
398 | /* FIXME: validate mode */ |
399 | pp->state.mode = mode; |
400 | pp->state.phase = init_phase (mode); |
401 | |
402 | if (pp->flags & PP_CLAIMED) { |
403 | pp->pdev->port->ieee1284.mode = mode; |
404 | pp->pdev->port->ieee1284.phase = pp->state.phase; |
405 | } |
406 | |
407 | return 0; |
408 | } |
409 | case PPGETMODE: |
410 | { |
411 | int mode; |
412 | |
413 | if (pp->flags & PP_CLAIMED) { |
414 | mode = pp->pdev->port->ieee1284.mode; |
415 | } else { |
416 | mode = pp->state.mode; |
417 | } |
418 | if (copy_to_user (argp, &mode, sizeof (mode))) { |
419 | return -EFAULT; |
420 | } |
421 | return 0; |
422 | } |
423 | case PPSETPHASE: |
424 | { |
425 | int phase; |
426 | if (copy_from_user (&phase, argp, sizeof (phase))) { |
427 | return -EFAULT; |
428 | } |
429 | /* FIXME: validate phase */ |
430 | pp->state.phase = phase; |
431 | |
432 | if (pp->flags & PP_CLAIMED) { |
433 | pp->pdev->port->ieee1284.phase = phase; |
434 | } |
435 | |
436 | return 0; |
437 | } |
438 | case PPGETPHASE: |
439 | { |
440 | int phase; |
441 | |
442 | if (pp->flags & PP_CLAIMED) { |
443 | phase = pp->pdev->port->ieee1284.phase; |
444 | } else { |
445 | phase = pp->state.phase; |
446 | } |
447 | if (copy_to_user (argp, &phase, sizeof (phase))) { |
448 | return -EFAULT; |
449 | } |
450 | return 0; |
451 | } |
452 | case PPGETMODES: |
453 | { |
454 | unsigned int modes; |
455 | |
456 | port = parport_find_number (minor); |
457 | if (!port) |
458 | return -ENODEV; |
459 | |
460 | modes = port->modes; |
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) { |
492 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
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; |
617 | par_timeout.tv_sec = to_jiffies / HZ; |
618 | par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); |
619 | if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) |
620 | return -EFAULT; |
621 | return 0; |
622 | |
623 | default: |
624 | pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd); |
625 | return -EINVAL; |
626 | } |
627 | |
628 | /* Keep the compiler happy */ |
629 | return 0; |
630 | } |
631 | |
632 | static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
633 | { |
634 | long ret; |
635 | lock_kernel(); |
636 | ret = pp_do_ioctl(file, cmd, arg); |
637 | unlock_kernel(); |
638 | return ret; |
639 | } |
640 | |
641 | static int pp_open (struct inode * inode, struct file * file) |
642 | { |
643 | unsigned int minor = iminor(inode); |
644 | struct pp_struct *pp; |
645 | |
646 | cycle_kernel_lock(); |
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); |
697 | pr_debug(CHRDEV "%x: negotiated back to compatibility " |
698 | "mode because user-space forgot\n", minor); |
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) { |
711 | pr_debug(CHRDEV "%x: released pardevice " |
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; |
721 | pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); |
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 | |
742 | static struct class *ppdev_class; |
743 | |
744 | static const struct file_operations pp_fops = { |
745 | .owner = THIS_MODULE, |
746 | .llseek = no_llseek, |
747 | .read = pp_read, |
748 | .write = pp_write, |
749 | .poll = pp_poll, |
750 | .unlocked_ioctl = pp_ioctl, |
751 | .open = pp_open, |
752 | .release = pp_release, |
753 | }; |
754 | |
755 | static void pp_attach(struct parport *port) |
756 | { |
757 | device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), |
758 | NULL, "parport%d", port->number); |
759 | } |
760 | |
761 | static void pp_detach(struct parport *port) |
762 | { |
763 | device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); |
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 | { |
774 | int err = 0; |
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 | } |
781 | ppdev_class = class_create(THIS_MODULE, CHRDEV); |
782 | if (IS_ERR(ppdev_class)) { |
783 | err = PTR_ERR(ppdev_class); |
784 | goto out_chrdev; |
785 | } |
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: |
795 | class_destroy(ppdev_class); |
796 | out_chrdev: |
797 | unregister_chrdev(PP_MAJOR, CHRDEV); |
798 | out: |
799 | return err; |
800 | } |
801 | |
802 | static void __exit ppdev_cleanup (void) |
803 | { |
804 | /* Clean up all parport stuff */ |
805 | parport_unregister_driver(&pp_driver); |
806 | class_destroy(ppdev_class); |
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); |
815 |
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v2.6.34-rc5
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