Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/drivers/char/ppdev.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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File size: 19913 byte(s)
Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 19913 byte(s)
Tag kernel26-2.6.12-alx-r9
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/devfs_fs_kernel.h> |
64 | #include <linux/ioctl.h> |
65 | #include <linux/parport.h> |
66 | #include <linux/ctype.h> |
67 | #include <linux/poll.h> |
68 | #include <asm/uaccess.h> |
69 | #include <linux/ppdev.h> |
70 | #include <linux/smp_lock.h> |
71 | #include <linux/device.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_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 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", |
119 | 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->f_dentry->d_inode); |
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 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", |
203 | minor); |
204 | return -EINVAL; |
205 | } |
206 | |
207 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); |
208 | if (!kbuffer) { |
209 | return -ENOMEM; |
210 | } |
211 | pport = pp->pdev->port; |
212 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); |
213 | |
214 | parport_set_timeout (pp->pdev, |
215 | (file->f_flags & O_NONBLOCK) ? |
216 | PARPORT_INACTIVITY_O_NONBLOCK : |
217 | pp->default_inactivity); |
218 | |
219 | while (bytes_written < count) { |
220 | ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); |
221 | |
222 | if (copy_from_user (kbuffer, buf + bytes_written, n)) { |
223 | bytes_written = -EFAULT; |
224 | break; |
225 | } |
226 | |
227 | if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { |
228 | /* do a fast EPP write */ |
229 | if (pport->ieee1284.mode & IEEE1284_ADDR) { |
230 | wrote = pport->ops->epp_write_addr (pport, |
231 | kbuffer, n, PARPORT_EPP_FAST); |
232 | } else { |
233 | wrote = pport->ops->epp_write_data (pport, |
234 | kbuffer, n, PARPORT_EPP_FAST); |
235 | } |
236 | } else { |
237 | wrote = parport_write (pp->pdev->port, kbuffer, n); |
238 | } |
239 | |
240 | if (wrote <= 0) { |
241 | if (!bytes_written) { |
242 | bytes_written = wrote; |
243 | } |
244 | break; |
245 | } |
246 | |
247 | bytes_written += wrote; |
248 | |
249 | if (file->f_flags & O_NONBLOCK) { |
250 | if (!bytes_written) |
251 | bytes_written = -EAGAIN; |
252 | break; |
253 | } |
254 | |
255 | if (signal_pending (current)) { |
256 | if (!bytes_written) { |
257 | bytes_written = -EINTR; |
258 | } |
259 | break; |
260 | } |
261 | |
262 | cond_resched(); |
263 | } |
264 | |
265 | parport_set_timeout (pp->pdev, pp->default_inactivity); |
266 | |
267 | kfree (kbuffer); |
268 | pp_enable_irq (pp); |
269 | return bytes_written; |
270 | } |
271 | |
272 | static void pp_irq (int irq, void * private, struct pt_regs * unused) |
273 | { |
274 | struct pp_struct * pp = (struct pp_struct *) private; |
275 | |
276 | if (pp->irqresponse) { |
277 | parport_write_control (pp->pdev->port, pp->irqctl); |
278 | pp->irqresponse = 0; |
279 | } |
280 | |
281 | atomic_inc (&pp->irqc); |
282 | wake_up_interruptible (&pp->irq_wait); |
283 | } |
284 | |
285 | static int register_device (int minor, struct pp_struct *pp) |
286 | { |
287 | struct parport *port; |
288 | struct pardevice * pdev = NULL; |
289 | char *name; |
290 | int fl; |
291 | |
292 | name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL); |
293 | if (name == NULL) |
294 | return -ENOMEM; |
295 | |
296 | sprintf (name, CHRDEV "%x", minor); |
297 | |
298 | port = parport_find_number (minor); |
299 | if (!port) { |
300 | printk (KERN_WARNING "%s: no associated port!\n", name); |
301 | kfree (name); |
302 | return -ENXIO; |
303 | } |
304 | |
305 | fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; |
306 | pdev = parport_register_device (port, name, NULL, |
307 | NULL, pp_irq, fl, pp); |
308 | parport_put_port (port); |
309 | |
310 | if (!pdev) { |
311 | printk (KERN_WARNING "%s: failed to register device!\n", name); |
312 | kfree (name); |
313 | return -ENXIO; |
314 | } |
315 | |
316 | pp->pdev = pdev; |
317 | printk (KERN_DEBUG "%s: registered pardevice\n", name); |
318 | return 0; |
319 | } |
320 | |
321 | static enum ieee1284_phase init_phase (int mode) |
322 | { |
323 | switch (mode & ~(IEEE1284_DEVICEID |
324 | | IEEE1284_ADDR)) { |
325 | case IEEE1284_MODE_NIBBLE: |
326 | case IEEE1284_MODE_BYTE: |
327 | return IEEE1284_PH_REV_IDLE; |
328 | } |
329 | return IEEE1284_PH_FWD_IDLE; |
330 | } |
331 | |
332 | static int pp_ioctl(struct inode *inode, struct file *file, |
333 | unsigned int cmd, unsigned long arg) |
334 | { |
335 | unsigned int minor = iminor(inode); |
336 | struct pp_struct *pp = file->private_data; |
337 | struct parport * port; |
338 | void __user *argp = (void __user *)arg; |
339 | |
340 | /* First handle the cases that don't take arguments. */ |
341 | switch (cmd) { |
342 | case PPCLAIM: |
343 | { |
344 | struct ieee1284_info *info; |
345 | int ret; |
346 | |
347 | if (pp->flags & PP_CLAIMED) { |
348 | printk (KERN_DEBUG CHRDEV |
349 | "%x: you've already got it!\n", minor); |
350 | return -EINVAL; |
351 | } |
352 | |
353 | /* Deferred device registration. */ |
354 | if (!pp->pdev) { |
355 | int err = register_device (minor, pp); |
356 | if (err) { |
357 | return err; |
358 | } |
359 | } |
360 | |
361 | ret = parport_claim_or_block (pp->pdev); |
362 | if (ret < 0) |
363 | return ret; |
364 | |
365 | pp->flags |= PP_CLAIMED; |
366 | |
367 | /* For interrupt-reporting to work, we need to be |
368 | * informed of each interrupt. */ |
369 | pp_enable_irq (pp); |
370 | |
371 | /* We may need to fix up the state machine. */ |
372 | info = &pp->pdev->port->ieee1284; |
373 | pp->saved_state.mode = info->mode; |
374 | pp->saved_state.phase = info->phase; |
375 | info->mode = pp->state.mode; |
376 | info->phase = pp->state.phase; |
377 | pp->default_inactivity = parport_set_timeout (pp->pdev, 0); |
378 | parport_set_timeout (pp->pdev, pp->default_inactivity); |
379 | |
380 | return 0; |
381 | } |
382 | case PPEXCL: |
383 | if (pp->pdev) { |
384 | printk (KERN_DEBUG CHRDEV "%x: too late for PPEXCL; " |
385 | "already registered\n", minor); |
386 | if (pp->flags & PP_EXCL) |
387 | /* But it's not really an error. */ |
388 | return 0; |
389 | /* There's no chance of making the driver happy. */ |
390 | return -EINVAL; |
391 | } |
392 | |
393 | /* Just remember to register the device exclusively |
394 | * when we finally do the registration. */ |
395 | pp->flags |= PP_EXCL; |
396 | return 0; |
397 | case PPSETMODE: |
398 | { |
399 | int mode; |
400 | if (copy_from_user (&mode, argp, sizeof (mode))) |
401 | return -EFAULT; |
402 | /* FIXME: validate mode */ |
403 | pp->state.mode = mode; |
404 | pp->state.phase = init_phase (mode); |
405 | |
406 | if (pp->flags & PP_CLAIMED) { |
407 | pp->pdev->port->ieee1284.mode = mode; |
408 | pp->pdev->port->ieee1284.phase = pp->state.phase; |
409 | } |
410 | |
411 | return 0; |
412 | } |
413 | case PPGETMODE: |
414 | { |
415 | int mode; |
416 | |
417 | if (pp->flags & PP_CLAIMED) { |
418 | mode = pp->pdev->port->ieee1284.mode; |
419 | } else { |
420 | mode = pp->state.mode; |
421 | } |
422 | if (copy_to_user (argp, &mode, sizeof (mode))) { |
423 | return -EFAULT; |
424 | } |
425 | return 0; |
426 | } |
427 | case PPSETPHASE: |
428 | { |
429 | int phase; |
430 | if (copy_from_user (&phase, argp, sizeof (phase))) { |
431 | return -EFAULT; |
432 | } |
433 | /* FIXME: validate phase */ |
434 | pp->state.phase = phase; |
435 | |
436 | if (pp->flags & PP_CLAIMED) { |
437 | pp->pdev->port->ieee1284.phase = phase; |
438 | } |
439 | |
440 | return 0; |
441 | } |
442 | case PPGETPHASE: |
443 | { |
444 | int phase; |
445 | |
446 | if (pp->flags & PP_CLAIMED) { |
447 | phase = pp->pdev->port->ieee1284.phase; |
448 | } else { |
449 | phase = pp->state.phase; |
450 | } |
451 | if (copy_to_user (argp, &phase, sizeof (phase))) { |
452 | return -EFAULT; |
453 | } |
454 | return 0; |
455 | } |
456 | case PPGETMODES: |
457 | { |
458 | unsigned int modes; |
459 | |
460 | port = parport_find_number (minor); |
461 | if (!port) |
462 | return -ENODEV; |
463 | |
464 | modes = port->modes; |
465 | if (copy_to_user (argp, &modes, sizeof (modes))) { |
466 | return -EFAULT; |
467 | } |
468 | return 0; |
469 | } |
470 | case PPSETFLAGS: |
471 | { |
472 | int uflags; |
473 | |
474 | if (copy_from_user (&uflags, argp, sizeof (uflags))) { |
475 | return -EFAULT; |
476 | } |
477 | pp->flags &= ~PP_FLAGMASK; |
478 | pp->flags |= (uflags & PP_FLAGMASK); |
479 | return 0; |
480 | } |
481 | case PPGETFLAGS: |
482 | { |
483 | int uflags; |
484 | |
485 | uflags = pp->flags & PP_FLAGMASK; |
486 | if (copy_to_user (argp, &uflags, sizeof (uflags))) { |
487 | return -EFAULT; |
488 | } |
489 | return 0; |
490 | } |
491 | } /* end switch() */ |
492 | |
493 | /* Everything else requires the port to be claimed, so check |
494 | * that now. */ |
495 | if ((pp->flags & PP_CLAIMED) == 0) { |
496 | printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", |
497 | minor); |
498 | return -EINVAL; |
499 | } |
500 | |
501 | port = pp->pdev->port; |
502 | switch (cmd) { |
503 | struct ieee1284_info *info; |
504 | unsigned char reg; |
505 | unsigned char mask; |
506 | int mode; |
507 | int ret; |
508 | struct timeval par_timeout; |
509 | long to_jiffies; |
510 | |
511 | case PPRSTATUS: |
512 | reg = parport_read_status (port); |
513 | if (copy_to_user (argp, ®, sizeof (reg))) |
514 | return -EFAULT; |
515 | return 0; |
516 | case PPRDATA: |
517 | reg = parport_read_data (port); |
518 | if (copy_to_user (argp, ®, sizeof (reg))) |
519 | return -EFAULT; |
520 | return 0; |
521 | case PPRCONTROL: |
522 | reg = parport_read_control (port); |
523 | if (copy_to_user (argp, ®, sizeof (reg))) |
524 | return -EFAULT; |
525 | return 0; |
526 | case PPYIELD: |
527 | parport_yield_blocking (pp->pdev); |
528 | return 0; |
529 | |
530 | case PPRELEASE: |
531 | /* Save the state machine's state. */ |
532 | info = &pp->pdev->port->ieee1284; |
533 | pp->state.mode = info->mode; |
534 | pp->state.phase = info->phase; |
535 | info->mode = pp->saved_state.mode; |
536 | info->phase = pp->saved_state.phase; |
537 | parport_release (pp->pdev); |
538 | pp->flags &= ~PP_CLAIMED; |
539 | return 0; |
540 | |
541 | case PPWCONTROL: |
542 | if (copy_from_user (®, argp, sizeof (reg))) |
543 | return -EFAULT; |
544 | parport_write_control (port, reg); |
545 | return 0; |
546 | |
547 | case PPWDATA: |
548 | if (copy_from_user (®, argp, sizeof (reg))) |
549 | return -EFAULT; |
550 | parport_write_data (port, reg); |
551 | return 0; |
552 | |
553 | case PPFCONTROL: |
554 | if (copy_from_user (&mask, argp, |
555 | sizeof (mask))) |
556 | return -EFAULT; |
557 | if (copy_from_user (®, 1 + (unsigned char __user *) arg, |
558 | sizeof (reg))) |
559 | return -EFAULT; |
560 | parport_frob_control (port, mask, reg); |
561 | return 0; |
562 | |
563 | case PPDATADIR: |
564 | if (copy_from_user (&mode, argp, sizeof (mode))) |
565 | return -EFAULT; |
566 | if (mode) |
567 | port->ops->data_reverse (port); |
568 | else |
569 | port->ops->data_forward (port); |
570 | return 0; |
571 | |
572 | case PPNEGOT: |
573 | if (copy_from_user (&mode, argp, sizeof (mode))) |
574 | return -EFAULT; |
575 | switch ((ret = parport_negotiate (port, mode))) { |
576 | case 0: break; |
577 | case -1: /* handshake failed, peripheral not IEEE 1284 */ |
578 | ret = -EIO; |
579 | break; |
580 | case 1: /* handshake succeeded, peripheral rejected mode */ |
581 | ret = -ENXIO; |
582 | break; |
583 | } |
584 | pp_enable_irq (pp); |
585 | return ret; |
586 | |
587 | case PPWCTLONIRQ: |
588 | if (copy_from_user (®, argp, sizeof (reg))) |
589 | return -EFAULT; |
590 | |
591 | /* Remember what to set the control lines to, for next |
592 | * time we get an interrupt. */ |
593 | pp->irqctl = reg; |
594 | pp->irqresponse = 1; |
595 | return 0; |
596 | |
597 | case PPCLRIRQ: |
598 | ret = atomic_read (&pp->irqc); |
599 | if (copy_to_user (argp, &ret, sizeof (ret))) |
600 | return -EFAULT; |
601 | atomic_sub (ret, &pp->irqc); |
602 | return 0; |
603 | |
604 | case PPSETTIME: |
605 | if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { |
606 | return -EFAULT; |
607 | } |
608 | /* Convert to jiffies, place in pp->pdev->timeout */ |
609 | if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { |
610 | return -EINVAL; |
611 | } |
612 | to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); |
613 | to_jiffies += par_timeout.tv_sec * (long)HZ; |
614 | if (to_jiffies <= 0) { |
615 | return -EINVAL; |
616 | } |
617 | pp->pdev->timeout = to_jiffies; |
618 | return 0; |
619 | |
620 | case PPGETTIME: |
621 | to_jiffies = pp->pdev->timeout; |
622 | par_timeout.tv_sec = to_jiffies / HZ; |
623 | par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); |
624 | if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) |
625 | return -EFAULT; |
626 | return 0; |
627 | |
628 | default: |
629 | printk (KERN_DEBUG CHRDEV "%x: What? (cmd=0x%x)\n", minor, |
630 | cmd); |
631 | return -EINVAL; |
632 | } |
633 | |
634 | /* Keep the compiler happy */ |
635 | return 0; |
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 | printk (KERN_DEBUG CHRDEV |
694 | "%x: negotiated back to compatibility mode because " |
695 | "user-space forgot\n", minor); |
696 | } |
697 | |
698 | if (pp->flags & PP_CLAIMED) { |
699 | struct ieee1284_info *info; |
700 | |
701 | info = &pp->pdev->port->ieee1284; |
702 | pp->state.mode = info->mode; |
703 | pp->state.phase = info->phase; |
704 | info->mode = pp->saved_state.mode; |
705 | info->phase = pp->saved_state.phase; |
706 | parport_release (pp->pdev); |
707 | if (compat_negot != 1) { |
708 | printk (KERN_DEBUG CHRDEV "%x: released pardevice " |
709 | "because user-space forgot\n", minor); |
710 | } |
711 | } |
712 | |
713 | if (pp->pdev) { |
714 | const char *name = pp->pdev->name; |
715 | parport_unregister_device (pp->pdev); |
716 | kfree (name); |
717 | pp->pdev = NULL; |
718 | printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n", |
719 | minor); |
720 | } |
721 | |
722 | kfree (pp); |
723 | |
724 | return 0; |
725 | } |
726 | |
727 | /* No kernel lock held - fine */ |
728 | static unsigned int pp_poll (struct file * file, poll_table * wait) |
729 | { |
730 | struct pp_struct *pp = file->private_data; |
731 | unsigned int mask = 0; |
732 | |
733 | poll_wait (file, &pp->irq_wait, wait); |
734 | if (atomic_read (&pp->irqc)) |
735 | mask |= POLLIN | POLLRDNORM; |
736 | |
737 | return mask; |
738 | } |
739 | |
740 | static struct class_simple *ppdev_class; |
741 | |
742 | static struct file_operations pp_fops = { |
743 | .owner = THIS_MODULE, |
744 | .llseek = no_llseek, |
745 | .read = pp_read, |
746 | .write = pp_write, |
747 | .poll = pp_poll, |
748 | .ioctl = pp_ioctl, |
749 | .open = pp_open, |
750 | .release = pp_release, |
751 | }; |
752 | |
753 | static void pp_attach(struct parport *port) |
754 | { |
755 | class_simple_device_add(ppdev_class, MKDEV(PP_MAJOR, port->number), |
756 | NULL, "parport%d", port->number); |
757 | } |
758 | |
759 | static void pp_detach(struct parport *port) |
760 | { |
761 | class_simple_device_remove(MKDEV(PP_MAJOR, port->number)); |
762 | } |
763 | |
764 | static struct parport_driver pp_driver = { |
765 | .name = CHRDEV, |
766 | .attach = pp_attach, |
767 | .detach = pp_detach, |
768 | }; |
769 | |
770 | static int __init ppdev_init (void) |
771 | { |
772 | int i, err = 0; |
773 | |
774 | if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) { |
775 | printk (KERN_WARNING CHRDEV ": unable to get major %d\n", |
776 | PP_MAJOR); |
777 | return -EIO; |
778 | } |
779 | ppdev_class = class_simple_create(THIS_MODULE, CHRDEV); |
780 | if (IS_ERR(ppdev_class)) { |
781 | err = PTR_ERR(ppdev_class); |
782 | goto out_chrdev; |
783 | } |
784 | devfs_mk_dir("parports"); |
785 | for (i = 0; i < PARPORT_MAX; i++) { |
786 | devfs_mk_cdev(MKDEV(PP_MAJOR, i), |
787 | S_IFCHR | S_IRUGO | S_IWUGO, "parports/%d", i); |
788 | } |
789 | if (parport_register_driver(&pp_driver)) { |
790 | printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); |
791 | goto out_class; |
792 | } |
793 | |
794 | printk (KERN_INFO PP_VERSION "\n"); |
795 | goto out; |
796 | |
797 | out_class: |
798 | for (i = 0; i < PARPORT_MAX; i++) |
799 | devfs_remove("parports/%d", i); |
800 | devfs_remove("parports"); |
801 | class_simple_destroy(ppdev_class); |
802 | out_chrdev: |
803 | unregister_chrdev(PP_MAJOR, CHRDEV); |
804 | out: |
805 | return err; |
806 | } |
807 | |
808 | static void __exit ppdev_cleanup (void) |
809 | { |
810 | int i; |
811 | /* Clean up all parport stuff */ |
812 | for (i = 0; i < PARPORT_MAX; i++) |
813 | devfs_remove("parports/%d", i); |
814 | parport_unregister_driver(&pp_driver); |
815 | devfs_remove("parports"); |
816 | class_simple_destroy(ppdev_class); |
817 | unregister_chrdev (PP_MAJOR, CHRDEV); |
818 | } |
819 | |
820 | module_init(ppdev_init); |
821 | module_exit(ppdev_cleanup); |
822 | |
823 | MODULE_LICENSE("GPL"); |
824 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |