1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * linux/drivers/char/ppdev.c |
4 | * |
5 | * This is the code behind /dev/parport* -- it allows a user-space |
6 | * application to use the parport subsystem. |
7 | * |
8 | * Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net> |
9 | * |
10 | * A /dev/parportx device node represents an arbitrary device |
11 | * on port 'x'. The following operations are possible: |
12 | * |
13 | * open do nothing, set up default IEEE 1284 protocol to be COMPAT |
14 | * close release port and unregister device (if necessary) |
15 | * ioctl |
16 | * EXCL register device exclusively (may fail) |
17 | * CLAIM (register device first time) parport_claim_or_block |
18 | * RELEASE parport_release |
19 | * SETMODE set the IEEE 1284 protocol to use for read/write |
20 | * SETPHASE set the IEEE 1284 phase of a particular mode. Not to be |
21 | * confused with ioctl(fd, SETPHASER, &stun). ;-) |
22 | * DATADIR data_forward / data_reverse |
23 | * WDATA write_data |
24 | * RDATA read_data |
25 | * WCONTROL write_control |
26 | * RCONTROL read_control |
27 | * FCONTROL frob_control |
28 | * RSTATUS read_status |
29 | * NEGOT parport_negotiate |
30 | * YIELD parport_yield_blocking |
31 | * WCTLONIRQ on interrupt, set control lines |
32 | * CLRIRQ clear (and return) interrupt count |
33 | * SETTIME sets device timeout (struct timeval) |
34 | * GETTIME gets device timeout (struct timeval) |
35 | * GETMODES gets hardware supported modes (unsigned int) |
36 | * GETMODE gets the current IEEE1284 mode |
37 | * GETPHASE gets the current IEEE1284 phase |
38 | * GETFLAGS gets current (user-visible) flags |
39 | * SETFLAGS sets current (user-visible) flags |
40 | * read/write read or write in current IEEE 1284 protocol |
41 | * select wait for interrupt (in readfds) |
42 | * |
43 | * Changes: |
44 | * Added SETTIME/GETTIME ioctl, Fred Barnes, 1999. |
45 | * |
46 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 2000/08/25 |
47 | * - On error, copy_from_user and copy_to_user do not return -EFAULT, |
48 | * They return the positive number of bytes *not* copied due to address |
49 | * space errors. |
50 | * |
51 | * Added GETMODES/GETMODE/GETPHASE ioctls, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001. |
52 | * Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001 |
53 | */ |
54 | |
55 | #include <linux/module.h> |
56 | #include <linux/init.h> |
57 | #include <linux/sched/signal.h> |
58 | #include <linux/device.h> |
59 | #include <linux/ioctl.h> |
60 | #include <linux/parport.h> |
61 | #include <linux/ctype.h> |
62 | #include <linux/poll.h> |
63 | #include <linux/slab.h> |
64 | #include <linux/major.h> |
65 | #include <linux/ppdev.h> |
66 | #include <linux/mutex.h> |
67 | #include <linux/uaccess.h> |
68 | #include <linux/compat.h> |
69 | |
70 | #define PP_VERSION "ppdev: user-space parallel port driver" |
71 | #define CHRDEV "ppdev" |
72 | |
73 | struct pp_struct { |
74 | struct pardevice *pdev; |
75 | wait_queue_head_t irq_wait; |
76 | atomic_t irqc; |
77 | unsigned int flags; |
78 | int irqresponse; |
79 | unsigned char irqctl; |
80 | struct ieee1284_info state; |
81 | struct ieee1284_info saved_state; |
82 | long default_inactivity; |
83 | int index; |
84 | }; |
85 | |
86 | /* should we use PARDEVICE_MAX here? */ |
87 | static struct device *devices[PARPORT_MAX]; |
88 | |
89 | static DEFINE_IDA(ida_index); |
90 | |
91 | /* pp_struct.flags bitfields */ |
92 | #define PP_CLAIMED (1<<0) |
93 | #define PP_EXCL (1<<1) |
94 | |
95 | /* Other constants */ |
96 | #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ |
97 | #define PP_BUFFER_SIZE 1024 |
98 | #define PARDEVICE_MAX 8 |
99 | |
100 | static DEFINE_MUTEX(pp_do_mutex); |
101 | |
102 | /* define fixed sized ioctl cmd for y2038 migration */ |
103 | #define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2]) |
104 | #define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2]) |
105 | #define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2]) |
106 | #define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2]) |
107 | |
108 | static inline void pp_enable_irq(struct pp_struct *pp) |
109 | { |
110 | struct parport *port = pp->pdev->port; |
111 | |
112 | port->ops->enable_irq(port); |
113 | } |
114 | |
115 | static ssize_t pp_read(struct file *file, char __user *buf, size_t count, |
116 | loff_t *ppos) |
117 | { |
118 | unsigned int minor = iminor(inode: file_inode(f: file)); |
119 | struct pp_struct *pp = file->private_data; |
120 | char *kbuffer; |
121 | ssize_t bytes_read = 0; |
122 | struct parport *pport; |
123 | int mode; |
124 | |
125 | if (!(pp->flags & PP_CLAIMED)) { |
126 | /* Don't have the port claimed */ |
127 | pr_debug(CHRDEV "%x: claim the port first\n" , minor); |
128 | return -EINVAL; |
129 | } |
130 | |
131 | /* Trivial case. */ |
132 | if (count == 0) |
133 | return 0; |
134 | |
135 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); |
136 | if (!kbuffer) |
137 | return -ENOMEM; |
138 | pport = pp->pdev->port; |
139 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); |
140 | |
141 | parport_set_timeout(pp->pdev, |
142 | inactivity: (file->f_flags & O_NONBLOCK) ? |
143 | PARPORT_INACTIVITY_O_NONBLOCK : |
144 | pp->default_inactivity); |
145 | |
146 | while (bytes_read == 0) { |
147 | ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); |
148 | |
149 | if (mode == IEEE1284_MODE_EPP) { |
150 | /* various specials for EPP mode */ |
151 | int flags = 0; |
152 | size_t (*fn)(struct parport *, void *, size_t, int); |
153 | |
154 | if (pp->flags & PP_W91284PIC) |
155 | flags |= PARPORT_W91284PIC; |
156 | if (pp->flags & PP_FASTREAD) |
157 | flags |= PARPORT_EPP_FAST; |
158 | if (pport->ieee1284.mode & IEEE1284_ADDR) |
159 | fn = pport->ops->epp_read_addr; |
160 | else |
161 | fn = pport->ops->epp_read_data; |
162 | bytes_read = (*fn)(pport, kbuffer, need, flags); |
163 | } else { |
164 | bytes_read = parport_read(pport, buf: kbuffer, len: need); |
165 | } |
166 | |
167 | if (bytes_read != 0) |
168 | break; |
169 | |
170 | if (file->f_flags & O_NONBLOCK) { |
171 | bytes_read = -EAGAIN; |
172 | break; |
173 | } |
174 | |
175 | if (signal_pending(current)) { |
176 | bytes_read = -ERESTARTSYS; |
177 | break; |
178 | } |
179 | |
180 | cond_resched(); |
181 | } |
182 | |
183 | parport_set_timeout(pp->pdev, inactivity: pp->default_inactivity); |
184 | |
185 | if (bytes_read > 0 && copy_to_user(to: buf, from: kbuffer, n: bytes_read)) |
186 | bytes_read = -EFAULT; |
187 | |
188 | kfree(objp: kbuffer); |
189 | pp_enable_irq(pp); |
190 | return bytes_read; |
191 | } |
192 | |
193 | static ssize_t pp_write(struct file *file, const char __user *buf, |
194 | size_t count, loff_t *ppos) |
195 | { |
196 | unsigned int minor = iminor(inode: file_inode(f: file)); |
197 | struct pp_struct *pp = file->private_data; |
198 | char *kbuffer; |
199 | ssize_t bytes_written = 0; |
200 | ssize_t wrote; |
201 | int mode; |
202 | struct parport *pport; |
203 | |
204 | if (!(pp->flags & PP_CLAIMED)) { |
205 | /* Don't have the port claimed */ |
206 | pr_debug(CHRDEV "%x: claim the port first\n" , minor); |
207 | return -EINVAL; |
208 | } |
209 | |
210 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); |
211 | if (!kbuffer) |
212 | return -ENOMEM; |
213 | |
214 | pport = pp->pdev->port; |
215 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); |
216 | |
217 | parport_set_timeout(pp->pdev, |
218 | inactivity: (file->f_flags & O_NONBLOCK) ? |
219 | PARPORT_INACTIVITY_O_NONBLOCK : |
220 | pp->default_inactivity); |
221 | |
222 | while (bytes_written < count) { |
223 | ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); |
224 | |
225 | if (copy_from_user(to: kbuffer, from: buf + bytes_written, n)) { |
226 | bytes_written = -EFAULT; |
227 | break; |
228 | } |
229 | |
230 | if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { |
231 | /* do a fast EPP write */ |
232 | if (pport->ieee1284.mode & IEEE1284_ADDR) { |
233 | wrote = pport->ops->epp_write_addr(pport, |
234 | kbuffer, n, PARPORT_EPP_FAST); |
235 | } else { |
236 | wrote = pport->ops->epp_write_data(pport, |
237 | kbuffer, n, PARPORT_EPP_FAST); |
238 | } |
239 | } else { |
240 | wrote = parport_write(pp->pdev->port, buf: kbuffer, len: n); |
241 | } |
242 | |
243 | if (wrote <= 0) { |
244 | if (!bytes_written) |
245 | bytes_written = wrote; |
246 | break; |
247 | } |
248 | |
249 | bytes_written += wrote; |
250 | |
251 | if (file->f_flags & O_NONBLOCK) { |
252 | if (!bytes_written) |
253 | bytes_written = -EAGAIN; |
254 | break; |
255 | } |
256 | |
257 | if (signal_pending(current)) |
258 | break; |
259 | |
260 | cond_resched(); |
261 | } |
262 | |
263 | parport_set_timeout(pp->pdev, inactivity: pp->default_inactivity); |
264 | |
265 | kfree(objp: 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(v: &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 | struct pardev_cb ppdev_cb; |
289 | int rc = 0, index; |
290 | |
291 | name = kasprintf(GFP_KERNEL, CHRDEV "%x" , minor); |
292 | if (name == NULL) |
293 | return -ENOMEM; |
294 | |
295 | port = parport_find_number(minor); |
296 | if (!port) { |
297 | pr_warn("%s: no associated port!\n" , name); |
298 | rc = -ENXIO; |
299 | goto err; |
300 | } |
301 | |
302 | index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL); |
303 | memset(&ppdev_cb, 0, sizeof(ppdev_cb)); |
304 | ppdev_cb.irq_func = pp_irq; |
305 | ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; |
306 | ppdev_cb.private = pp; |
307 | pdev = parport_register_dev_model(port, name, par_dev_cb: &ppdev_cb, cnt: index); |
308 | parport_put_port(port); |
309 | |
310 | if (!pdev) { |
311 | pr_warn("%s: failed to register device!\n" , name); |
312 | rc = -ENXIO; |
313 | ida_simple_remove(&ida_index, index); |
314 | goto err; |
315 | } |
316 | |
317 | pp->pdev = pdev; |
318 | pp->index = index; |
319 | dev_dbg(&pdev->dev, "registered pardevice\n" ); |
320 | err: |
321 | kfree(objp: name); |
322 | return rc; |
323 | } |
324 | |
325 | static enum ieee1284_phase init_phase(int mode) |
326 | { |
327 | switch (mode & ~(IEEE1284_DEVICEID |
328 | | IEEE1284_ADDR)) { |
329 | case IEEE1284_MODE_NIBBLE: |
330 | case IEEE1284_MODE_BYTE: |
331 | return IEEE1284_PH_REV_IDLE; |
332 | } |
333 | return IEEE1284_PH_FWD_IDLE; |
334 | } |
335 | |
336 | static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) |
337 | { |
338 | long to_jiffies; |
339 | |
340 | if ((tv_sec < 0) || (tv_usec < 0)) |
341 | return -EINVAL; |
342 | |
343 | to_jiffies = usecs_to_jiffies(u: tv_usec); |
344 | to_jiffies += tv_sec * HZ; |
345 | if (to_jiffies <= 0) |
346 | return -EINVAL; |
347 | |
348 | pdev->timeout = to_jiffies; |
349 | return 0; |
350 | } |
351 | |
352 | static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
353 | { |
354 | unsigned int minor = iminor(inode: file_inode(f: file)); |
355 | struct pp_struct *pp = file->private_data; |
356 | struct parport *port; |
357 | void __user *argp = (void __user *)arg; |
358 | struct ieee1284_info *info; |
359 | unsigned char reg; |
360 | unsigned char mask; |
361 | int mode; |
362 | s32 time32[2]; |
363 | s64 time64[2]; |
364 | struct timespec64 ts; |
365 | int ret; |
366 | |
367 | /* First handle the cases that don't take arguments. */ |
368 | switch (cmd) { |
369 | case PPCLAIM: |
370 | { |
371 | if (pp->flags & PP_CLAIMED) { |
372 | dev_dbg(&pp->pdev->dev, "you've already got it!\n" ); |
373 | return -EINVAL; |
374 | } |
375 | |
376 | /* Deferred device registration. */ |
377 | if (!pp->pdev) { |
378 | int err = register_device(minor, pp); |
379 | |
380 | if (err) |
381 | return err; |
382 | } |
383 | |
384 | ret = parport_claim_or_block(dev: pp->pdev); |
385 | if (ret < 0) |
386 | return ret; |
387 | |
388 | pp->flags |= PP_CLAIMED; |
389 | |
390 | /* For interrupt-reporting to work, we need to be |
391 | * informed of each interrupt. */ |
392 | pp_enable_irq(pp); |
393 | |
394 | /* We may need to fix up the state machine. */ |
395 | info = &pp->pdev->port->ieee1284; |
396 | pp->saved_state.mode = info->mode; |
397 | pp->saved_state.phase = info->phase; |
398 | info->mode = pp->state.mode; |
399 | info->phase = pp->state.phase; |
400 | pp->default_inactivity = parport_set_timeout(pp->pdev, inactivity: 0); |
401 | parport_set_timeout(pp->pdev, inactivity: pp->default_inactivity); |
402 | |
403 | return 0; |
404 | } |
405 | case PPEXCL: |
406 | if (pp->pdev) { |
407 | dev_dbg(&pp->pdev->dev, |
408 | "too late for PPEXCL; already registered\n" ); |
409 | if (pp->flags & PP_EXCL) |
410 | /* But it's not really an error. */ |
411 | return 0; |
412 | /* There's no chance of making the driver happy. */ |
413 | return -EINVAL; |
414 | } |
415 | |
416 | /* Just remember to register the device exclusively |
417 | * when we finally do the registration. */ |
418 | pp->flags |= PP_EXCL; |
419 | return 0; |
420 | case PPSETMODE: |
421 | { |
422 | int mode; |
423 | |
424 | if (copy_from_user(to: &mode, from: argp, n: sizeof(mode))) |
425 | return -EFAULT; |
426 | /* FIXME: validate mode */ |
427 | pp->state.mode = mode; |
428 | pp->state.phase = init_phase(mode); |
429 | |
430 | if (pp->flags & PP_CLAIMED) { |
431 | pp->pdev->port->ieee1284.mode = mode; |
432 | pp->pdev->port->ieee1284.phase = pp->state.phase; |
433 | } |
434 | |
435 | return 0; |
436 | } |
437 | case PPGETMODE: |
438 | { |
439 | int mode; |
440 | |
441 | if (pp->flags & PP_CLAIMED) |
442 | mode = pp->pdev->port->ieee1284.mode; |
443 | else |
444 | mode = pp->state.mode; |
445 | |
446 | if (copy_to_user(to: argp, from: &mode, n: sizeof(mode))) |
447 | return -EFAULT; |
448 | return 0; |
449 | } |
450 | case PPSETPHASE: |
451 | { |
452 | int phase; |
453 | |
454 | if (copy_from_user(to: &phase, from: argp, n: sizeof(phase))) |
455 | return -EFAULT; |
456 | |
457 | /* FIXME: validate phase */ |
458 | pp->state.phase = phase; |
459 | |
460 | if (pp->flags & PP_CLAIMED) |
461 | pp->pdev->port->ieee1284.phase = phase; |
462 | |
463 | return 0; |
464 | } |
465 | case PPGETPHASE: |
466 | { |
467 | int phase; |
468 | |
469 | if (pp->flags & PP_CLAIMED) |
470 | phase = pp->pdev->port->ieee1284.phase; |
471 | else |
472 | phase = pp->state.phase; |
473 | if (copy_to_user(to: argp, from: &phase, n: sizeof(phase))) |
474 | return -EFAULT; |
475 | return 0; |
476 | } |
477 | case PPGETMODES: |
478 | { |
479 | unsigned int modes; |
480 | |
481 | port = parport_find_number(minor); |
482 | if (!port) |
483 | return -ENODEV; |
484 | |
485 | modes = port->modes; |
486 | parport_put_port(port); |
487 | if (copy_to_user(to: argp, from: &modes, n: sizeof(modes))) |
488 | return -EFAULT; |
489 | return 0; |
490 | } |
491 | case PPSETFLAGS: |
492 | { |
493 | int uflags; |
494 | |
495 | if (copy_from_user(to: &uflags, from: argp, n: sizeof(uflags))) |
496 | return -EFAULT; |
497 | pp->flags &= ~PP_FLAGMASK; |
498 | pp->flags |= (uflags & PP_FLAGMASK); |
499 | return 0; |
500 | } |
501 | case PPGETFLAGS: |
502 | { |
503 | int uflags; |
504 | |
505 | uflags = pp->flags & PP_FLAGMASK; |
506 | if (copy_to_user(to: argp, from: &uflags, n: sizeof(uflags))) |
507 | return -EFAULT; |
508 | return 0; |
509 | } |
510 | } /* end switch() */ |
511 | |
512 | /* Everything else requires the port to be claimed, so check |
513 | * that now. */ |
514 | if ((pp->flags & PP_CLAIMED) == 0) { |
515 | pr_debug(CHRDEV "%x: claim the port first\n" , minor); |
516 | return -EINVAL; |
517 | } |
518 | |
519 | port = pp->pdev->port; |
520 | switch (cmd) { |
521 | case PPRSTATUS: |
522 | reg = parport_read_status(port); |
523 | if (copy_to_user(to: argp, from: ®, n: sizeof(reg))) |
524 | return -EFAULT; |
525 | return 0; |
526 | case PPRDATA: |
527 | reg = parport_read_data(port); |
528 | if (copy_to_user(to: argp, from: ®, n: sizeof(reg))) |
529 | return -EFAULT; |
530 | return 0; |
531 | case PPRCONTROL: |
532 | reg = parport_read_control(port); |
533 | if (copy_to_user(to: argp, from: ®, n: sizeof(reg))) |
534 | return -EFAULT; |
535 | return 0; |
536 | case PPYIELD: |
537 | parport_yield_blocking(dev: pp->pdev); |
538 | return 0; |
539 | |
540 | case PPRELEASE: |
541 | /* Save the state machine's state. */ |
542 | info = &pp->pdev->port->ieee1284; |
543 | pp->state.mode = info->mode; |
544 | pp->state.phase = info->phase; |
545 | info->mode = pp->saved_state.mode; |
546 | info->phase = pp->saved_state.phase; |
547 | parport_release(dev: pp->pdev); |
548 | pp->flags &= ~PP_CLAIMED; |
549 | return 0; |
550 | |
551 | case PPWCONTROL: |
552 | if (copy_from_user(to: ®, from: argp, n: sizeof(reg))) |
553 | return -EFAULT; |
554 | parport_write_control(port, reg); |
555 | return 0; |
556 | |
557 | case PPWDATA: |
558 | if (copy_from_user(to: ®, from: argp, n: sizeof(reg))) |
559 | return -EFAULT; |
560 | parport_write_data(port, reg); |
561 | return 0; |
562 | |
563 | case PPFCONTROL: |
564 | if (copy_from_user(to: &mask, from: argp, |
565 | n: sizeof(mask))) |
566 | return -EFAULT; |
567 | if (copy_from_user(to: ®, from: 1 + (unsigned char __user *) arg, |
568 | n: sizeof(reg))) |
569 | return -EFAULT; |
570 | parport_frob_control(port, mask, reg); |
571 | return 0; |
572 | |
573 | case PPDATADIR: |
574 | if (copy_from_user(to: &mode, from: argp, n: sizeof(mode))) |
575 | return -EFAULT; |
576 | if (mode) |
577 | port->ops->data_reverse(port); |
578 | else |
579 | port->ops->data_forward(port); |
580 | return 0; |
581 | |
582 | case PPNEGOT: |
583 | if (copy_from_user(to: &mode, from: argp, n: sizeof(mode))) |
584 | return -EFAULT; |
585 | switch ((ret = parport_negotiate(port, mode))) { |
586 | case 0: break; |
587 | case -1: /* handshake failed, peripheral not IEEE 1284 */ |
588 | ret = -EIO; |
589 | break; |
590 | case 1: /* handshake succeeded, peripheral rejected mode */ |
591 | ret = -ENXIO; |
592 | break; |
593 | } |
594 | pp_enable_irq(pp); |
595 | return ret; |
596 | |
597 | case PPWCTLONIRQ: |
598 | if (copy_from_user(to: ®, from: argp, n: sizeof(reg))) |
599 | return -EFAULT; |
600 | |
601 | /* Remember what to set the control lines to, for next |
602 | * time we get an interrupt. */ |
603 | pp->irqctl = reg; |
604 | pp->irqresponse = 1; |
605 | return 0; |
606 | |
607 | case PPCLRIRQ: |
608 | ret = atomic_read(v: &pp->irqc); |
609 | if (copy_to_user(to: argp, from: &ret, n: sizeof(ret))) |
610 | return -EFAULT; |
611 | atomic_sub(i: ret, v: &pp->irqc); |
612 | return 0; |
613 | |
614 | case PPSETTIME32: |
615 | if (copy_from_user(to: time32, from: argp, n: sizeof(time32))) |
616 | return -EFAULT; |
617 | |
618 | if ((time32[0] < 0) || (time32[1] < 0)) |
619 | return -EINVAL; |
620 | |
621 | return pp_set_timeout(pdev: pp->pdev, tv_sec: time32[0], tv_usec: time32[1]); |
622 | |
623 | case PPSETTIME64: |
624 | if (copy_from_user(to: time64, from: argp, n: sizeof(time64))) |
625 | return -EFAULT; |
626 | |
627 | if ((time64[0] < 0) || (time64[1] < 0)) |
628 | return -EINVAL; |
629 | |
630 | if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) |
631 | time64[1] >>= 32; |
632 | |
633 | return pp_set_timeout(pdev: pp->pdev, tv_sec: time64[0], tv_usec: time64[1]); |
634 | |
635 | case PPGETTIME32: |
636 | jiffies_to_timespec64(jiffies: pp->pdev->timeout, value: &ts); |
637 | time32[0] = ts.tv_sec; |
638 | time32[1] = ts.tv_nsec / NSEC_PER_USEC; |
639 | |
640 | if (copy_to_user(to: argp, from: time32, n: sizeof(time32))) |
641 | return -EFAULT; |
642 | |
643 | return 0; |
644 | |
645 | case PPGETTIME64: |
646 | jiffies_to_timespec64(jiffies: pp->pdev->timeout, value: &ts); |
647 | time64[0] = ts.tv_sec; |
648 | time64[1] = ts.tv_nsec / NSEC_PER_USEC; |
649 | |
650 | if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) |
651 | time64[1] <<= 32; |
652 | |
653 | if (copy_to_user(to: argp, from: time64, n: sizeof(time64))) |
654 | return -EFAULT; |
655 | |
656 | return 0; |
657 | |
658 | default: |
659 | dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n" , cmd); |
660 | return -EINVAL; |
661 | } |
662 | |
663 | /* Keep the compiler happy */ |
664 | return 0; |
665 | } |
666 | |
667 | static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
668 | { |
669 | long ret; |
670 | |
671 | mutex_lock(&pp_do_mutex); |
672 | ret = pp_do_ioctl(file, cmd, arg); |
673 | mutex_unlock(lock: &pp_do_mutex); |
674 | return ret; |
675 | } |
676 | |
677 | static int pp_open(struct inode *inode, struct file *file) |
678 | { |
679 | unsigned int minor = iminor(inode); |
680 | struct pp_struct *pp; |
681 | |
682 | if (minor >= PARPORT_MAX) |
683 | return -ENXIO; |
684 | |
685 | pp = kmalloc(size: sizeof(struct pp_struct), GFP_KERNEL); |
686 | if (!pp) |
687 | return -ENOMEM; |
688 | |
689 | pp->state.mode = IEEE1284_MODE_COMPAT; |
690 | pp->state.phase = init_phase(mode: pp->state.mode); |
691 | pp->flags = 0; |
692 | pp->irqresponse = 0; |
693 | atomic_set(v: &pp->irqc, i: 0); |
694 | init_waitqueue_head(&pp->irq_wait); |
695 | |
696 | /* Defer the actual device registration until the first claim. |
697 | * That way, we know whether or not the driver wants to have |
698 | * exclusive access to the port (PPEXCL). |
699 | */ |
700 | pp->pdev = NULL; |
701 | file->private_data = pp; |
702 | |
703 | return 0; |
704 | } |
705 | |
706 | static int pp_release(struct inode *inode, struct file *file) |
707 | { |
708 | unsigned int minor = iminor(inode); |
709 | struct pp_struct *pp = file->private_data; |
710 | int compat_negot; |
711 | |
712 | compat_negot = 0; |
713 | if (!(pp->flags & PP_CLAIMED) && pp->pdev && |
714 | (pp->state.mode != IEEE1284_MODE_COMPAT)) { |
715 | struct ieee1284_info *info; |
716 | |
717 | /* parport released, but not in compatibility mode */ |
718 | parport_claim_or_block(dev: pp->pdev); |
719 | pp->flags |= PP_CLAIMED; |
720 | info = &pp->pdev->port->ieee1284; |
721 | pp->saved_state.mode = info->mode; |
722 | pp->saved_state.phase = info->phase; |
723 | info->mode = pp->state.mode; |
724 | info->phase = pp->state.phase; |
725 | compat_negot = 1; |
726 | } else if ((pp->flags & PP_CLAIMED) && pp->pdev && |
727 | (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { |
728 | compat_negot = 2; |
729 | } |
730 | if (compat_negot) { |
731 | parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); |
732 | dev_dbg(&pp->pdev->dev, |
733 | "negotiated back to compatibility mode because user-space forgot\n" ); |
734 | } |
735 | |
736 | if ((pp->flags & PP_CLAIMED) && pp->pdev) { |
737 | struct ieee1284_info *info; |
738 | |
739 | info = &pp->pdev->port->ieee1284; |
740 | pp->state.mode = info->mode; |
741 | pp->state.phase = info->phase; |
742 | info->mode = pp->saved_state.mode; |
743 | info->phase = pp->saved_state.phase; |
744 | parport_release(dev: pp->pdev); |
745 | if (compat_negot != 1) { |
746 | pr_debug(CHRDEV "%x: released pardevice " |
747 | "because user-space forgot\n" , minor); |
748 | } |
749 | } |
750 | |
751 | if (pp->pdev) { |
752 | parport_unregister_device(dev: pp->pdev); |
753 | ida_simple_remove(&ida_index, pp->index); |
754 | pp->pdev = NULL; |
755 | pr_debug(CHRDEV "%x: unregistered pardevice\n" , minor); |
756 | } |
757 | |
758 | kfree(objp: pp); |
759 | |
760 | return 0; |
761 | } |
762 | |
763 | /* No kernel lock held - fine */ |
764 | static __poll_t pp_poll(struct file *file, poll_table *wait) |
765 | { |
766 | struct pp_struct *pp = file->private_data; |
767 | __poll_t mask = 0; |
768 | |
769 | poll_wait(filp: file, wait_address: &pp->irq_wait, p: wait); |
770 | if (atomic_read(v: &pp->irqc)) |
771 | mask |= EPOLLIN | EPOLLRDNORM; |
772 | |
773 | return mask; |
774 | } |
775 | |
776 | static const struct class ppdev_class = { |
777 | .name = CHRDEV, |
778 | }; |
779 | |
780 | static const struct file_operations pp_fops = { |
781 | .owner = THIS_MODULE, |
782 | .llseek = no_llseek, |
783 | .read = pp_read, |
784 | .write = pp_write, |
785 | .poll = pp_poll, |
786 | .unlocked_ioctl = pp_ioctl, |
787 | .compat_ioctl = compat_ptr_ioctl, |
788 | .open = pp_open, |
789 | .release = pp_release, |
790 | }; |
791 | |
792 | static void pp_attach(struct parport *port) |
793 | { |
794 | struct device *ret; |
795 | |
796 | if (devices[port->number]) |
797 | return; |
798 | |
799 | ret = device_create(cls: &ppdev_class, parent: port->dev, |
800 | MKDEV(PP_MAJOR, port->number), NULL, |
801 | fmt: "parport%d" , port->number); |
802 | if (IS_ERR(ptr: ret)) { |
803 | pr_err("Failed to create device parport%d\n" , |
804 | port->number); |
805 | return; |
806 | } |
807 | devices[port->number] = ret; |
808 | } |
809 | |
810 | static void pp_detach(struct parport *port) |
811 | { |
812 | if (!devices[port->number]) |
813 | return; |
814 | |
815 | device_destroy(cls: &ppdev_class, MKDEV(PP_MAJOR, port->number)); |
816 | devices[port->number] = NULL; |
817 | } |
818 | |
819 | static int pp_probe(struct pardevice *par_dev) |
820 | { |
821 | struct device_driver *drv = par_dev->dev.driver; |
822 | int len = strlen(drv->name); |
823 | |
824 | if (strncmp(par_dev->name, drv->name, len)) |
825 | return -ENODEV; |
826 | |
827 | return 0; |
828 | } |
829 | |
830 | static struct parport_driver pp_driver = { |
831 | .name = CHRDEV, |
832 | .probe = pp_probe, |
833 | .match_port = pp_attach, |
834 | .detach = pp_detach, |
835 | .devmodel = true, |
836 | }; |
837 | |
838 | static int __init ppdev_init(void) |
839 | { |
840 | int err = 0; |
841 | |
842 | if (register_chrdev(PP_MAJOR, CHRDEV, fops: &pp_fops)) { |
843 | pr_warn(CHRDEV ": unable to get major %d\n" , PP_MAJOR); |
844 | return -EIO; |
845 | } |
846 | err = class_register(class: &ppdev_class); |
847 | if (err) |
848 | goto out_chrdev; |
849 | |
850 | err = parport_register_driver(&pp_driver); |
851 | if (err < 0) { |
852 | pr_warn(CHRDEV ": unable to register with parport\n" ); |
853 | goto out_class; |
854 | } |
855 | |
856 | pr_info(PP_VERSION "\n" ); |
857 | goto out; |
858 | |
859 | out_class: |
860 | class_unregister(class: &ppdev_class); |
861 | out_chrdev: |
862 | unregister_chrdev(PP_MAJOR, CHRDEV); |
863 | out: |
864 | return err; |
865 | } |
866 | |
867 | static void __exit ppdev_cleanup(void) |
868 | { |
869 | /* Clean up all parport stuff */ |
870 | parport_unregister_driver(&pp_driver); |
871 | class_unregister(class: &ppdev_class); |
872 | unregister_chrdev(PP_MAJOR, CHRDEV); |
873 | } |
874 | |
875 | module_init(ppdev_init); |
876 | module_exit(ppdev_cleanup); |
877 | |
878 | MODULE_LICENSE("GPL" ); |
879 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |
880 | |