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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/mutex.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 DEFINE_MUTEX(pp_do_mutex); |
101 | static inline void pp_enable_irq (struct pp_struct *pp) |
102 | { |
103 | struct parport *port = pp->pdev->port; |
104 | port->ops->enable_irq (port); |
105 | } |
106 | |
107 | static ssize_t pp_read (struct file * file, char __user * buf, size_t count, |
108 | loff_t * ppos) |
109 | { |
110 | unsigned int minor = iminor(file_inode(file)); |
111 | struct pp_struct *pp = file->private_data; |
112 | char * kbuffer; |
113 | ssize_t bytes_read = 0; |
114 | struct parport *pport; |
115 | int mode; |
116 | |
117 | if (!(pp->flags & PP_CLAIMED)) { |
118 | /* Don't have the port claimed */ |
119 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
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 | { |
192 | unsigned int minor = iminor(file_inode(file)); |
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 */ |
202 | pr_debug(CHRDEV "%x: claim the port first\n", 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 | break; |
256 | |
257 | cond_resched(); |
258 | } |
259 | |
260 | parport_set_timeout (pp->pdev, pp->default_inactivity); |
261 | |
262 | kfree (kbuffer); |
263 | pp_enable_irq (pp); |
264 | return bytes_written; |
265 | } |
266 | |
267 | static void pp_irq (void *private) |
268 | { |
269 | struct pp_struct *pp = private; |
270 | |
271 | if (pp->irqresponse) { |
272 | parport_write_control (pp->pdev->port, pp->irqctl); |
273 | pp->irqresponse = 0; |
274 | } |
275 | |
276 | atomic_inc (&pp->irqc); |
277 | wake_up_interruptible (&pp->irq_wait); |
278 | } |
279 | |
280 | static int register_device (int minor, struct pp_struct *pp) |
281 | { |
282 | struct parport *port; |
283 | struct pardevice * pdev = NULL; |
284 | char *name; |
285 | int fl; |
286 | |
287 | name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); |
288 | if (name == NULL) |
289 | return -ENOMEM; |
290 | |
291 | port = parport_find_number (minor); |
292 | if (!port) { |
293 | printk (KERN_WARNING "%s: no associated port!\n", name); |
294 | kfree (name); |
295 | return -ENXIO; |
296 | } |
297 | |
298 | fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; |
299 | pdev = parport_register_device (port, name, NULL, |
300 | NULL, pp_irq, fl, pp); |
301 | parport_put_port (port); |
302 | |
303 | if (!pdev) { |
304 | printk (KERN_WARNING "%s: failed to register device!\n", name); |
305 | kfree (name); |
306 | return -ENXIO; |
307 | } |
308 | |
309 | pp->pdev = pdev; |
310 | pr_debug("%s: registered pardevice\n", name); |
311 | return 0; |
312 | } |
313 | |
314 | static enum ieee1284_phase init_phase (int mode) |
315 | { |
316 | switch (mode & ~(IEEE1284_DEVICEID |
317 | | IEEE1284_ADDR)) { |
318 | case IEEE1284_MODE_NIBBLE: |
319 | case IEEE1284_MODE_BYTE: |
320 | return IEEE1284_PH_REV_IDLE; |
321 | } |
322 | return IEEE1284_PH_FWD_IDLE; |
323 | } |
324 | |
325 | static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
326 | { |
327 | unsigned int minor = iminor(file_inode(file)); |
328 | struct pp_struct *pp = file->private_data; |
329 | struct parport * port; |
330 | void __user *argp = (void __user *)arg; |
331 | |
332 | /* First handle the cases that don't take arguments. */ |
333 | switch (cmd) { |
334 | case PPCLAIM: |
335 | { |
336 | struct ieee1284_info *info; |
337 | int ret; |
338 | |
339 | if (pp->flags & PP_CLAIMED) { |
340 | pr_debug(CHRDEV "%x: you've already got it!\n", minor); |
341 | return -EINVAL; |
342 | } |
343 | |
344 | /* Deferred device registration. */ |
345 | if (!pp->pdev) { |
346 | int err = register_device (minor, pp); |
347 | if (err) { |
348 | return err; |
349 | } |
350 | } |
351 | |
352 | ret = parport_claim_or_block (pp->pdev); |
353 | if (ret < 0) |
354 | return ret; |
355 | |
356 | pp->flags |= PP_CLAIMED; |
357 | |
358 | /* For interrupt-reporting to work, we need to be |
359 | * informed of each interrupt. */ |
360 | pp_enable_irq (pp); |
361 | |
362 | /* We may need to fix up the state machine. */ |
363 | info = &pp->pdev->port->ieee1284; |
364 | pp->saved_state.mode = info->mode; |
365 | pp->saved_state.phase = info->phase; |
366 | info->mode = pp->state.mode; |
367 | info->phase = pp->state.phase; |
368 | pp->default_inactivity = parport_set_timeout (pp->pdev, 0); |
369 | parport_set_timeout (pp->pdev, pp->default_inactivity); |
370 | |
371 | return 0; |
372 | } |
373 | case PPEXCL: |
374 | if (pp->pdev) { |
375 | pr_debug(CHRDEV "%x: too late for PPEXCL; " |
376 | "already registered\n", minor); |
377 | if (pp->flags & PP_EXCL) |
378 | /* But it's not really an error. */ |
379 | return 0; |
380 | /* There's no chance of making the driver happy. */ |
381 | return -EINVAL; |
382 | } |
383 | |
384 | /* Just remember to register the device exclusively |
385 | * when we finally do the registration. */ |
386 | pp->flags |= PP_EXCL; |
387 | return 0; |
388 | case PPSETMODE: |
389 | { |
390 | int mode; |
391 | if (copy_from_user (&mode, argp, sizeof (mode))) |
392 | return -EFAULT; |
393 | /* FIXME: validate mode */ |
394 | pp->state.mode = mode; |
395 | pp->state.phase = init_phase (mode); |
396 | |
397 | if (pp->flags & PP_CLAIMED) { |
398 | pp->pdev->port->ieee1284.mode = mode; |
399 | pp->pdev->port->ieee1284.phase = pp->state.phase; |
400 | } |
401 | |
402 | return 0; |
403 | } |
404 | case PPGETMODE: |
405 | { |
406 | int mode; |
407 | |
408 | if (pp->flags & PP_CLAIMED) { |
409 | mode = pp->pdev->port->ieee1284.mode; |
410 | } else { |
411 | mode = pp->state.mode; |
412 | } |
413 | if (copy_to_user (argp, &mode, sizeof (mode))) { |
414 | return -EFAULT; |
415 | } |
416 | return 0; |
417 | } |
418 | case PPSETPHASE: |
419 | { |
420 | int phase; |
421 | if (copy_from_user (&phase, argp, sizeof (phase))) { |
422 | return -EFAULT; |
423 | } |
424 | /* FIXME: validate phase */ |
425 | pp->state.phase = phase; |
426 | |
427 | if (pp->flags & PP_CLAIMED) { |
428 | pp->pdev->port->ieee1284.phase = phase; |
429 | } |
430 | |
431 | return 0; |
432 | } |
433 | case PPGETPHASE: |
434 | { |
435 | int phase; |
436 | |
437 | if (pp->flags & PP_CLAIMED) { |
438 | phase = pp->pdev->port->ieee1284.phase; |
439 | } else { |
440 | phase = pp->state.phase; |
441 | } |
442 | if (copy_to_user (argp, &phase, sizeof (phase))) { |
443 | return -EFAULT; |
444 | } |
445 | return 0; |
446 | } |
447 | case PPGETMODES: |
448 | { |
449 | unsigned int modes; |
450 | |
451 | port = parport_find_number (minor); |
452 | if (!port) |
453 | return -ENODEV; |
454 | |
455 | modes = port->modes; |
456 | parport_put_port(port); |
457 | if (copy_to_user (argp, &modes, sizeof (modes))) { |
458 | return -EFAULT; |
459 | } |
460 | return 0; |
461 | } |
462 | case PPSETFLAGS: |
463 | { |
464 | int uflags; |
465 | |
466 | if (copy_from_user (&uflags, argp, sizeof (uflags))) { |
467 | return -EFAULT; |
468 | } |
469 | pp->flags &= ~PP_FLAGMASK; |
470 | pp->flags |= (uflags & PP_FLAGMASK); |
471 | return 0; |
472 | } |
473 | case PPGETFLAGS: |
474 | { |
475 | int uflags; |
476 | |
477 | uflags = pp->flags & PP_FLAGMASK; |
478 | if (copy_to_user (argp, &uflags, sizeof (uflags))) { |
479 | return -EFAULT; |
480 | } |
481 | return 0; |
482 | } |
483 | } /* end switch() */ |
484 | |
485 | /* Everything else requires the port to be claimed, so check |
486 | * that now. */ |
487 | if ((pp->flags & PP_CLAIMED) == 0) { |
488 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
489 | return -EINVAL; |
490 | } |
491 | |
492 | port = pp->pdev->port; |
493 | switch (cmd) { |
494 | struct ieee1284_info *info; |
495 | unsigned char reg; |
496 | unsigned char mask; |
497 | int mode; |
498 | int ret; |
499 | struct timeval par_timeout; |
500 | long to_jiffies; |
501 | |
502 | case PPRSTATUS: |
503 | reg = parport_read_status (port); |
504 | if (copy_to_user (argp, ®, sizeof (reg))) |
505 | return -EFAULT; |
506 | return 0; |
507 | case PPRDATA: |
508 | reg = parport_read_data (port); |
509 | if (copy_to_user (argp, ®, sizeof (reg))) |
510 | return -EFAULT; |
511 | return 0; |
512 | case PPRCONTROL: |
513 | reg = parport_read_control (port); |
514 | if (copy_to_user (argp, ®, sizeof (reg))) |
515 | return -EFAULT; |
516 | return 0; |
517 | case PPYIELD: |
518 | parport_yield_blocking (pp->pdev); |
519 | return 0; |
520 | |
521 | case PPRELEASE: |
522 | /* Save the state machine's state. */ |
523 | info = &pp->pdev->port->ieee1284; |
524 | pp->state.mode = info->mode; |
525 | pp->state.phase = info->phase; |
526 | info->mode = pp->saved_state.mode; |
527 | info->phase = pp->saved_state.phase; |
528 | parport_release (pp->pdev); |
529 | pp->flags &= ~PP_CLAIMED; |
530 | return 0; |
531 | |
532 | case PPWCONTROL: |
533 | if (copy_from_user (®, argp, sizeof (reg))) |
534 | return -EFAULT; |
535 | parport_write_control (port, reg); |
536 | return 0; |
537 | |
538 | case PPWDATA: |
539 | if (copy_from_user (®, argp, sizeof (reg))) |
540 | return -EFAULT; |
541 | parport_write_data (port, reg); |
542 | return 0; |
543 | |
544 | case PPFCONTROL: |
545 | if (copy_from_user (&mask, argp, |
546 | sizeof (mask))) |
547 | return -EFAULT; |
548 | if (copy_from_user (®, 1 + (unsigned char __user *) arg, |
549 | sizeof (reg))) |
550 | return -EFAULT; |
551 | parport_frob_control (port, mask, reg); |
552 | return 0; |
553 | |
554 | case PPDATADIR: |
555 | if (copy_from_user (&mode, argp, sizeof (mode))) |
556 | return -EFAULT; |
557 | if (mode) |
558 | port->ops->data_reverse (port); |
559 | else |
560 | port->ops->data_forward (port); |
561 | return 0; |
562 | |
563 | case PPNEGOT: |
564 | if (copy_from_user (&mode, argp, sizeof (mode))) |
565 | return -EFAULT; |
566 | switch ((ret = parport_negotiate (port, mode))) { |
567 | case 0: break; |
568 | case -1: /* handshake failed, peripheral not IEEE 1284 */ |
569 | ret = -EIO; |
570 | break; |
571 | case 1: /* handshake succeeded, peripheral rejected mode */ |
572 | ret = -ENXIO; |
573 | break; |
574 | } |
575 | pp_enable_irq (pp); |
576 | return ret; |
577 | |
578 | case PPWCTLONIRQ: |
579 | if (copy_from_user (®, argp, sizeof (reg))) |
580 | return -EFAULT; |
581 | |
582 | /* Remember what to set the control lines to, for next |
583 | * time we get an interrupt. */ |
584 | pp->irqctl = reg; |
585 | pp->irqresponse = 1; |
586 | return 0; |
587 | |
588 | case PPCLRIRQ: |
589 | ret = atomic_read (&pp->irqc); |
590 | if (copy_to_user (argp, &ret, sizeof (ret))) |
591 | return -EFAULT; |
592 | atomic_sub (ret, &pp->irqc); |
593 | return 0; |
594 | |
595 | case PPSETTIME: |
596 | if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { |
597 | return -EFAULT; |
598 | } |
599 | /* Convert to jiffies, place in pp->pdev->timeout */ |
600 | if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { |
601 | return -EINVAL; |
602 | } |
603 | to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); |
604 | to_jiffies += par_timeout.tv_sec * (long)HZ; |
605 | if (to_jiffies <= 0) { |
606 | return -EINVAL; |
607 | } |
608 | pp->pdev->timeout = to_jiffies; |
609 | return 0; |
610 | |
611 | case PPGETTIME: |
612 | to_jiffies = pp->pdev->timeout; |
613 | memset(&par_timeout, 0, sizeof(par_timeout)); |
614 | par_timeout.tv_sec = to_jiffies / HZ; |
615 | par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); |
616 | if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) |
617 | return -EFAULT; |
618 | return 0; |
619 | |
620 | default: |
621 | pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd); |
622 | return -EINVAL; |
623 | } |
624 | |
625 | /* Keep the compiler happy */ |
626 | return 0; |
627 | } |
628 | |
629 | static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
630 | { |
631 | long ret; |
632 | mutex_lock(&pp_do_mutex); |
633 | ret = pp_do_ioctl(file, cmd, arg); |
634 | mutex_unlock(&pp_do_mutex); |
635 | return ret; |
636 | } |
637 | |
638 | static int pp_open (struct inode * inode, struct file * file) |
639 | { |
640 | unsigned int minor = iminor(inode); |
641 | struct pp_struct *pp; |
642 | |
643 | if (minor >= PARPORT_MAX) |
644 | return -ENXIO; |
645 | |
646 | pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); |
647 | if (!pp) |
648 | return -ENOMEM; |
649 | |
650 | pp->state.mode = IEEE1284_MODE_COMPAT; |
651 | pp->state.phase = init_phase (pp->state.mode); |
652 | pp->flags = 0; |
653 | pp->irqresponse = 0; |
654 | atomic_set (&pp->irqc, 0); |
655 | init_waitqueue_head (&pp->irq_wait); |
656 | |
657 | /* Defer the actual device registration until the first claim. |
658 | * That way, we know whether or not the driver wants to have |
659 | * exclusive access to the port (PPEXCL). |
660 | */ |
661 | pp->pdev = NULL; |
662 | file->private_data = pp; |
663 | |
664 | return 0; |
665 | } |
666 | |
667 | static int pp_release (struct inode * inode, struct file * file) |
668 | { |
669 | unsigned int minor = iminor(inode); |
670 | struct pp_struct *pp = file->private_data; |
671 | int compat_negot; |
672 | |
673 | compat_negot = 0; |
674 | if (!(pp->flags & PP_CLAIMED) && pp->pdev && |
675 | (pp->state.mode != IEEE1284_MODE_COMPAT)) { |
676 | struct ieee1284_info *info; |
677 | |
678 | /* parport released, but not in compatibility mode */ |
679 | parport_claim_or_block (pp->pdev); |
680 | pp->flags |= PP_CLAIMED; |
681 | info = &pp->pdev->port->ieee1284; |
682 | pp->saved_state.mode = info->mode; |
683 | pp->saved_state.phase = info->phase; |
684 | info->mode = pp->state.mode; |
685 | info->phase = pp->state.phase; |
686 | compat_negot = 1; |
687 | } else if ((pp->flags & PP_CLAIMED) && pp->pdev && |
688 | (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { |
689 | compat_negot = 2; |
690 | } |
691 | if (compat_negot) { |
692 | parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); |
693 | pr_debug(CHRDEV "%x: negotiated back to compatibility " |
694 | "mode because 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 | pr_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 | pr_debug(CHRDEV "%x: unregistered pardevice\n", 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 | |
738 | static struct class *ppdev_class; |
739 | |
740 | static const struct file_operations pp_fops = { |
741 | .owner = THIS_MODULE, |
742 | .llseek = no_llseek, |
743 | .read = pp_read, |
744 | .write = pp_write, |
745 | .poll = pp_poll, |
746 | .unlocked_ioctl = pp_ioctl, |
747 | .open = pp_open, |
748 | .release = pp_release, |
749 | }; |
750 | |
751 | static void pp_attach(struct parport *port) |
752 | { |
753 | device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), |
754 | NULL, "parport%d", port->number); |
755 | } |
756 | |
757 | static void pp_detach(struct parport *port) |
758 | { |
759 | device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); |
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 | { |
770 | int err = 0; |
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 | } |
777 | ppdev_class = class_create(THIS_MODULE, CHRDEV); |
778 | if (IS_ERR(ppdev_class)) { |
779 | err = PTR_ERR(ppdev_class); |
780 | goto out_chrdev; |
781 | } |
782 | err = parport_register_driver(&pp_driver); |
783 | if (err < 0) { |
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: |
792 | class_destroy(ppdev_class); |
793 | out_chrdev: |
794 | unregister_chrdev(PP_MAJOR, CHRDEV); |
795 | out: |
796 | return err; |
797 | } |
798 | |
799 | static void __exit ppdev_cleanup (void) |
800 | { |
801 | /* Clean up all parport stuff */ |
802 | parport_unregister_driver(&pp_driver); |
803 | class_destroy(ppdev_class); |
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); |
812 |
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Tags:
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v2.6.34-rc5
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