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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/signal.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 | #include <linux/compat.h> | |
73 | ||
74 | #define PP_VERSION "ppdev: user-space parallel port driver" | |
75 | #define CHRDEV "ppdev" | |
76 | ||
77 | struct pp_struct { | |
78 | struct pardevice *pdev; | |
79 | wait_queue_head_t irq_wait; | |
80 | atomic_t irqc; | |
81 | unsigned int flags; | |
82 | int irqresponse; | |
83 | unsigned char irqctl; | |
84 | struct ieee1284_info state; | |
85 | struct ieee1284_info saved_state; | |
86 | long default_inactivity; | |
87 | int index; | |
88 | }; | |
89 | ||
90 | /* should we use PARDEVICE_MAX here? */ | |
91 | static struct device *devices[PARPORT_MAX]; | |
92 | ||
93 | static DEFINE_IDA(ida_index); | |
94 | ||
95 | /* pp_struct.flags bitfields */ | |
96 | #define PP_CLAIMED (1<<0) | |
97 | #define PP_EXCL (1<<1) | |
98 | ||
99 | /* Other constants */ | |
100 | #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ | |
101 | #define PP_BUFFER_SIZE 1024 | |
102 | #define PARDEVICE_MAX 8 | |
103 | ||
104 | static DEFINE_MUTEX(pp_do_mutex); | |
105 | ||
106 | /* define fixed sized ioctl cmd for y2038 migration */ | |
107 | #define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2]) | |
108 | #define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2]) | |
109 | #define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2]) | |
110 | #define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2]) | |
111 | ||
112 | static inline void pp_enable_irq(struct pp_struct *pp) | |
113 | { | |
114 | struct parport *port = pp->pdev->port; | |
115 | ||
116 | port->ops->enable_irq(port); | |
117 | } | |
118 | ||
119 | static ssize_t pp_read(struct file *file, char __user *buf, size_t count, | |
120 | loff_t *ppos) | |
121 | { | |
122 | unsigned int minor = iminor(file_inode(file)); | |
123 | struct pp_struct *pp = file->private_data; | |
124 | char *kbuffer; | |
125 | ssize_t bytes_read = 0; | |
126 | struct parport *pport; | |
127 | int mode; | |
128 | ||
129 | if (!(pp->flags & PP_CLAIMED)) { | |
130 | /* Don't have the port claimed */ | |
131 | pr_debug(CHRDEV "%x: claim the port first\n", minor); | |
132 | return -EINVAL; | |
133 | } | |
134 | ||
135 | /* Trivial case. */ | |
136 | if (count == 0) | |
137 | return 0; | |
138 | ||
139 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
140 | if (!kbuffer) | |
141 | return -ENOMEM; | |
142 | pport = pp->pdev->port; | |
143 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
144 | ||
145 | parport_set_timeout(pp->pdev, | |
146 | (file->f_flags & O_NONBLOCK) ? | |
147 | PARPORT_INACTIVITY_O_NONBLOCK : | |
148 | pp->default_inactivity); | |
149 | ||
150 | while (bytes_read == 0) { | |
151 | ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); | |
152 | ||
153 | if (mode == IEEE1284_MODE_EPP) { | |
154 | /* various specials for EPP mode */ | |
155 | int flags = 0; | |
156 | size_t (*fn)(struct parport *, void *, size_t, int); | |
157 | ||
158 | if (pp->flags & PP_W91284PIC) | |
159 | flags |= PARPORT_W91284PIC; | |
160 | if (pp->flags & PP_FASTREAD) | |
161 | flags |= PARPORT_EPP_FAST; | |
162 | if (pport->ieee1284.mode & IEEE1284_ADDR) | |
163 | fn = pport->ops->epp_read_addr; | |
164 | else | |
165 | fn = pport->ops->epp_read_data; | |
166 | bytes_read = (*fn)(pport, kbuffer, need, flags); | |
167 | } else { | |
168 | bytes_read = parport_read(pport, kbuffer, need); | |
169 | } | |
170 | ||
171 | if (bytes_read != 0) | |
172 | break; | |
173 | ||
174 | if (file->f_flags & O_NONBLOCK) { | |
175 | bytes_read = -EAGAIN; | |
176 | break; | |
177 | } | |
178 | ||
179 | if (signal_pending(current)) { | |
180 | bytes_read = -ERESTARTSYS; | |
181 | break; | |
182 | } | |
183 | ||
184 | cond_resched(); | |
185 | } | |
186 | ||
187 | parport_set_timeout(pp->pdev, pp->default_inactivity); | |
188 | ||
189 | if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read)) | |
190 | bytes_read = -EFAULT; | |
191 | ||
192 | kfree(kbuffer); | |
193 | pp_enable_irq(pp); | |
194 | return bytes_read; | |
195 | } | |
196 | ||
197 | static ssize_t pp_write(struct file *file, const char __user *buf, | |
198 | size_t count, loff_t *ppos) | |
199 | { | |
200 | unsigned int minor = iminor(file_inode(file)); | |
201 | struct pp_struct *pp = file->private_data; | |
202 | char *kbuffer; | |
203 | ssize_t bytes_written = 0; | |
204 | ssize_t wrote; | |
205 | int mode; | |
206 | struct parport *pport; | |
207 | ||
208 | if (!(pp->flags & PP_CLAIMED)) { | |
209 | /* Don't have the port claimed */ | |
210 | pr_debug(CHRDEV "%x: claim the port first\n", minor); | |
211 | return -EINVAL; | |
212 | } | |
213 | ||
214 | kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); | |
215 | if (!kbuffer) | |
216 | return -ENOMEM; | |
217 | ||
218 | pport = pp->pdev->port; | |
219 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
220 | ||
221 | parport_set_timeout(pp->pdev, | |
222 | (file->f_flags & O_NONBLOCK) ? | |
223 | PARPORT_INACTIVITY_O_NONBLOCK : | |
224 | pp->default_inactivity); | |
225 | ||
226 | while (bytes_written < count) { | |
227 | ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); | |
228 | ||
229 | if (copy_from_user(kbuffer, buf + bytes_written, n)) { | |
230 | bytes_written = -EFAULT; | |
231 | break; | |
232 | } | |
233 | ||
234 | if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { | |
235 | /* do a fast EPP write */ | |
236 | if (pport->ieee1284.mode & IEEE1284_ADDR) { | |
237 | wrote = pport->ops->epp_write_addr(pport, | |
238 | kbuffer, n, PARPORT_EPP_FAST); | |
239 | } else { | |
240 | wrote = pport->ops->epp_write_data(pport, | |
241 | kbuffer, n, PARPORT_EPP_FAST); | |
242 | } | |
243 | } else { | |
244 | wrote = parport_write(pp->pdev->port, kbuffer, n); | |
245 | } | |
246 | ||
247 | if (wrote <= 0) { | |
248 | if (!bytes_written) | |
249 | bytes_written = wrote; | |
250 | break; | |
251 | } | |
252 | ||
253 | bytes_written += wrote; | |
254 | ||
255 | if (file->f_flags & O_NONBLOCK) { | |
256 | if (!bytes_written) | |
257 | bytes_written = -EAGAIN; | |
258 | break; | |
259 | } | |
260 | ||
261 | if (signal_pending(current)) | |
262 | break; | |
263 | ||
264 | cond_resched(); | |
265 | } | |
266 | ||
267 | parport_set_timeout(pp->pdev, pp->default_inactivity); | |
268 | ||
269 | kfree(kbuffer); | |
270 | pp_enable_irq(pp); | |
271 | return bytes_written; | |
272 | } | |
273 | ||
274 | static void pp_irq(void *private) | |
275 | { | |
276 | struct pp_struct *pp = private; | |
277 | ||
278 | if (pp->irqresponse) { | |
279 | parport_write_control(pp->pdev->port, pp->irqctl); | |
280 | pp->irqresponse = 0; | |
281 | } | |
282 | ||
283 | atomic_inc(&pp->irqc); | |
284 | wake_up_interruptible(&pp->irq_wait); | |
285 | } | |
286 | ||
287 | static int register_device(int minor, struct pp_struct *pp) | |
288 | { | |
289 | struct parport *port; | |
290 | struct pardevice *pdev = NULL; | |
291 | char *name; | |
292 | struct pardev_cb ppdev_cb; | |
293 | int rc = 0, index; | |
294 | ||
295 | name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); | |
296 | if (name == NULL) | |
297 | return -ENOMEM; | |
298 | ||
299 | port = parport_find_number(minor); | |
300 | if (!port) { | |
301 | pr_warn("%s: no associated port!\n", name); | |
302 | rc = -ENXIO; | |
303 | goto err; | |
304 | } | |
305 | ||
306 | index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL); | |
307 | memset(&ppdev_cb, 0, sizeof(ppdev_cb)); | |
308 | ppdev_cb.irq_func = pp_irq; | |
309 | ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; | |
310 | ppdev_cb.private = pp; | |
311 | pdev = parport_register_dev_model(port, name, &ppdev_cb, index); | |
312 | parport_put_port(port); | |
313 | ||
314 | if (!pdev) { | |
315 | pr_warn("%s: failed to register device!\n", name); | |
316 | rc = -ENXIO; | |
317 | ida_simple_remove(&ida_index, index); | |
318 | goto err; | |
319 | } | |
320 | ||
321 | pp->pdev = pdev; | |
322 | pp->index = index; | |
323 | dev_dbg(&pdev->dev, "registered pardevice\n"); | |
324 | err: | |
325 | kfree(name); | |
326 | return rc; | |
327 | } | |
328 | ||
329 | static enum ieee1284_phase init_phase(int mode) | |
330 | { | |
331 | switch (mode & ~(IEEE1284_DEVICEID | |
332 | | IEEE1284_ADDR)) { | |
333 | case IEEE1284_MODE_NIBBLE: | |
334 | case IEEE1284_MODE_BYTE: | |
335 | return IEEE1284_PH_REV_IDLE; | |
336 | } | |
337 | return IEEE1284_PH_FWD_IDLE; | |
338 | } | |
339 | ||
340 | static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) | |
341 | { | |
342 | long to_jiffies; | |
343 | ||
344 | if ((tv_sec < 0) || (tv_usec < 0)) | |
345 | return -EINVAL; | |
346 | ||
347 | to_jiffies = usecs_to_jiffies(tv_usec); | |
348 | to_jiffies += tv_sec * HZ; | |
349 | if (to_jiffies <= 0) | |
350 | return -EINVAL; | |
351 | ||
352 | pdev->timeout = to_jiffies; | |
353 | return 0; | |
354 | } | |
355 | ||
356 | static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
357 | { | |
358 | unsigned int minor = iminor(file_inode(file)); | |
359 | struct pp_struct *pp = file->private_data; | |
360 | struct parport *port; | |
361 | void __user *argp = (void __user *)arg; | |
362 | ||
363 | /* First handle the cases that don't take arguments. */ | |
364 | switch (cmd) { | |
365 | case PPCLAIM: | |
366 | { | |
367 | struct ieee1284_info *info; | |
368 | int ret; | |
369 | ||
370 | if (pp->flags & PP_CLAIMED) { | |
371 | dev_dbg(&pp->pdev->dev, "you've already got it!\n"); | |
372 | return -EINVAL; | |
373 | } | |
374 | ||
375 | /* Deferred device registration. */ | |
376 | if (!pp->pdev) { | |
377 | int err = register_device(minor, pp); | |
378 | ||
379 | if (err) | |
380 | return err; | |
381 | } | |
382 | ||
383 | ret = parport_claim_or_block(pp->pdev); | |
384 | if (ret < 0) | |
385 | return ret; | |
386 | ||
387 | pp->flags |= PP_CLAIMED; | |
388 | ||
389 | /* For interrupt-reporting to work, we need to be | |
390 | * informed of each interrupt. */ | |
391 | pp_enable_irq(pp); | |
392 | ||
393 | /* We may need to fix up the state machine. */ | |
394 | info = &pp->pdev->port->ieee1284; | |
395 | pp->saved_state.mode = info->mode; | |
396 | pp->saved_state.phase = info->phase; | |
397 | info->mode = pp->state.mode; | |
398 | info->phase = pp->state.phase; | |
399 | pp->default_inactivity = parport_set_timeout(pp->pdev, 0); | |
400 | parport_set_timeout(pp->pdev, pp->default_inactivity); | |
401 | ||
402 | return 0; | |
403 | } | |
404 | case PPEXCL: | |
405 | if (pp->pdev) { | |
406 | dev_dbg(&pp->pdev->dev, | |
407 | "too late for PPEXCL; already registered\n"); | |
408 | if (pp->flags & PP_EXCL) | |
409 | /* But it's not really an error. */ | |
410 | return 0; | |
411 | /* There's no chance of making the driver happy. */ | |
412 | return -EINVAL; | |
413 | } | |
414 | ||
415 | /* Just remember to register the device exclusively | |
416 | * when we finally do the registration. */ | |
417 | pp->flags |= PP_EXCL; | |
418 | return 0; | |
419 | case PPSETMODE: | |
420 | { | |
421 | int mode; | |
422 | ||
423 | if (copy_from_user(&mode, argp, sizeof(mode))) | |
424 | return -EFAULT; | |
425 | /* FIXME: validate mode */ | |
426 | pp->state.mode = mode; | |
427 | pp->state.phase = init_phase(mode); | |
428 | ||
429 | if (pp->flags & PP_CLAIMED) { | |
430 | pp->pdev->port->ieee1284.mode = mode; | |
431 | pp->pdev->port->ieee1284.phase = pp->state.phase; | |
432 | } | |
433 | ||
434 | return 0; | |
435 | } | |
436 | case PPGETMODE: | |
437 | { | |
438 | int mode; | |
439 | ||
440 | if (pp->flags & PP_CLAIMED) | |
441 | mode = pp->pdev->port->ieee1284.mode; | |
442 | else | |
443 | mode = pp->state.mode; | |
444 | ||
445 | if (copy_to_user(argp, &mode, sizeof(mode))) | |
446 | return -EFAULT; | |
447 | return 0; | |
448 | } | |
449 | case PPSETPHASE: | |
450 | { | |
451 | int phase; | |
452 | ||
453 | if (copy_from_user(&phase, argp, sizeof(phase))) | |
454 | return -EFAULT; | |
455 | ||
456 | /* FIXME: validate phase */ | |
457 | pp->state.phase = phase; | |
458 | ||
459 | if (pp->flags & PP_CLAIMED) | |
460 | pp->pdev->port->ieee1284.phase = phase; | |
461 | ||
462 | return 0; | |
463 | } | |
464 | case PPGETPHASE: | |
465 | { | |
466 | int phase; | |
467 | ||
468 | if (pp->flags & PP_CLAIMED) | |
469 | phase = pp->pdev->port->ieee1284.phase; | |
470 | else | |
471 | phase = pp->state.phase; | |
472 | if (copy_to_user(argp, &phase, sizeof(phase))) | |
473 | return -EFAULT; | |
474 | return 0; | |
475 | } | |
476 | case PPGETMODES: | |
477 | { | |
478 | unsigned int modes; | |
479 | ||
480 | port = parport_find_number(minor); | |
481 | if (!port) | |
482 | return -ENODEV; | |
483 | ||
484 | modes = port->modes; | |
485 | parport_put_port(port); | |
486 | if (copy_to_user(argp, &modes, sizeof(modes))) | |
487 | return -EFAULT; | |
488 | return 0; | |
489 | } | |
490 | case PPSETFLAGS: | |
491 | { | |
492 | int uflags; | |
493 | ||
494 | if (copy_from_user(&uflags, argp, sizeof(uflags))) | |
495 | return -EFAULT; | |
496 | pp->flags &= ~PP_FLAGMASK; | |
497 | pp->flags |= (uflags & PP_FLAGMASK); | |
498 | return 0; | |
499 | } | |
500 | case PPGETFLAGS: | |
501 | { | |
502 | int uflags; | |
503 | ||
504 | uflags = pp->flags & PP_FLAGMASK; | |
505 | if (copy_to_user(argp, &uflags, sizeof(uflags))) | |
506 | return -EFAULT; | |
507 | return 0; | |
508 | } | |
509 | } /* end switch() */ | |
510 | ||
511 | /* Everything else requires the port to be claimed, so check | |
512 | * that now. */ | |
513 | if ((pp->flags & PP_CLAIMED) == 0) { | |
514 | pr_debug(CHRDEV "%x: claim the port first\n", minor); | |
515 | return -EINVAL; | |
516 | } | |
517 | ||
518 | port = pp->pdev->port; | |
519 | switch (cmd) { | |
520 | struct ieee1284_info *info; | |
521 | unsigned char reg; | |
522 | unsigned char mask; | |
523 | int mode; | |
524 | s32 time32[2]; | |
525 | s64 time64[2]; | |
526 | struct timespec64 ts; | |
527 | int ret; | |
528 | ||
529 | case PPRSTATUS: | |
530 | reg = parport_read_status(port); | |
531 | if (copy_to_user(argp, ®, sizeof(reg))) | |
532 | return -EFAULT; | |
533 | return 0; | |
534 | case PPRDATA: | |
535 | reg = parport_read_data(port); | |
536 | if (copy_to_user(argp, ®, sizeof(reg))) | |
537 | return -EFAULT; | |
538 | return 0; | |
539 | case PPRCONTROL: | |
540 | reg = parport_read_control(port); | |
541 | if (copy_to_user(argp, ®, sizeof(reg))) | |
542 | return -EFAULT; | |
543 | return 0; | |
544 | case PPYIELD: | |
545 | parport_yield_blocking(pp->pdev); | |
546 | return 0; | |
547 | ||
548 | case PPRELEASE: | |
549 | /* Save the state machine's state. */ | |
550 | info = &pp->pdev->port->ieee1284; | |
551 | pp->state.mode = info->mode; | |
552 | pp->state.phase = info->phase; | |
553 | info->mode = pp->saved_state.mode; | |
554 | info->phase = pp->saved_state.phase; | |
555 | parport_release(pp->pdev); | |
556 | pp->flags &= ~PP_CLAIMED; | |
557 | return 0; | |
558 | ||
559 | case PPWCONTROL: | |
560 | if (copy_from_user(®, argp, sizeof(reg))) | |
561 | return -EFAULT; | |
562 | parport_write_control(port, reg); | |
563 | return 0; | |
564 | ||
565 | case PPWDATA: | |
566 | if (copy_from_user(®, argp, sizeof(reg))) | |
567 | return -EFAULT; | |
568 | parport_write_data(port, reg); | |
569 | return 0; | |
570 | ||
571 | case PPFCONTROL: | |
572 | if (copy_from_user(&mask, argp, | |
573 | sizeof(mask))) | |
574 | return -EFAULT; | |
575 | if (copy_from_user(®, 1 + (unsigned char __user *) arg, | |
576 | sizeof(reg))) | |
577 | return -EFAULT; | |
578 | parport_frob_control(port, mask, reg); | |
579 | return 0; | |
580 | ||
581 | case PPDATADIR: | |
582 | if (copy_from_user(&mode, argp, sizeof(mode))) | |
583 | return -EFAULT; | |
584 | if (mode) | |
585 | port->ops->data_reverse(port); | |
586 | else | |
587 | port->ops->data_forward(port); | |
588 | return 0; | |
589 | ||
590 | case PPNEGOT: | |
591 | if (copy_from_user(&mode, argp, sizeof(mode))) | |
592 | return -EFAULT; | |
593 | switch ((ret = parport_negotiate(port, mode))) { | |
594 | case 0: break; | |
595 | case -1: /* handshake failed, peripheral not IEEE 1284 */ | |
596 | ret = -EIO; | |
597 | break; | |
598 | case 1: /* handshake succeeded, peripheral rejected mode */ | |
599 | ret = -ENXIO; | |
600 | break; | |
601 | } | |
602 | pp_enable_irq(pp); | |
603 | return ret; | |
604 | ||
605 | case PPWCTLONIRQ: | |
606 | if (copy_from_user(®, argp, sizeof(reg))) | |
607 | return -EFAULT; | |
608 | ||
609 | /* Remember what to set the control lines to, for next | |
610 | * time we get an interrupt. */ | |
611 | pp->irqctl = reg; | |
612 | pp->irqresponse = 1; | |
613 | return 0; | |
614 | ||
615 | case PPCLRIRQ: | |
616 | ret = atomic_read(&pp->irqc); | |
617 | if (copy_to_user(argp, &ret, sizeof(ret))) | |
618 | return -EFAULT; | |
619 | atomic_sub(ret, &pp->irqc); | |
620 | return 0; | |
621 | ||
622 | case PPSETTIME32: | |
623 | if (copy_from_user(time32, argp, sizeof(time32))) | |
624 | return -EFAULT; | |
625 | ||
626 | if ((time32[0] < 0) || (time32[1] < 0)) | |
627 | return -EINVAL; | |
628 | ||
629 | return pp_set_timeout(pp->pdev, time32[0], time32[1]); | |
630 | ||
631 | case PPSETTIME64: | |
632 | if (copy_from_user(time64, argp, sizeof(time64))) | |
633 | return -EFAULT; | |
634 | ||
635 | if ((time64[0] < 0) || (time64[1] < 0)) | |
636 | return -EINVAL; | |
637 | ||
638 | if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) | |
639 | time64[1] >>= 32; | |
640 | ||
641 | return pp_set_timeout(pp->pdev, time64[0], time64[1]); | |
642 | ||
643 | case PPGETTIME32: | |
644 | jiffies_to_timespec64(pp->pdev->timeout, &ts); | |
645 | time32[0] = ts.tv_sec; | |
646 | time32[1] = ts.tv_nsec / NSEC_PER_USEC; | |
647 | ||
648 | if (copy_to_user(argp, time32, sizeof(time32))) | |
649 | return -EFAULT; | |
650 | ||
651 | return 0; | |
652 | ||
653 | case PPGETTIME64: | |
654 | jiffies_to_timespec64(pp->pdev->timeout, &ts); | |
655 | time64[0] = ts.tv_sec; | |
656 | time64[1] = ts.tv_nsec / NSEC_PER_USEC; | |
657 | ||
658 | if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) | |
659 | time64[1] <<= 32; | |
660 | ||
661 | if (copy_to_user(argp, time64, sizeof(time64))) | |
662 | return -EFAULT; | |
663 | ||
664 | return 0; | |
665 | ||
666 | default: | |
667 | dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd); | |
668 | return -EINVAL; | |
669 | } | |
670 | ||
671 | /* Keep the compiler happy */ | |
672 | return 0; | |
673 | } | |
674 | ||
675 | static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
676 | { | |
677 | long ret; | |
678 | ||
679 | mutex_lock(&pp_do_mutex); | |
680 | ret = pp_do_ioctl(file, cmd, arg); | |
681 | mutex_unlock(&pp_do_mutex); | |
682 | return ret; | |
683 | } | |
684 | ||
685 | #ifdef CONFIG_COMPAT | |
686 | static long pp_compat_ioctl(struct file *file, unsigned int cmd, | |
687 | unsigned long arg) | |
688 | { | |
689 | return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
690 | } | |
691 | #endif | |
692 | ||
693 | static int pp_open(struct inode *inode, struct file *file) | |
694 | { | |
695 | unsigned int minor = iminor(inode); | |
696 | struct pp_struct *pp; | |
697 | ||
698 | if (minor >= PARPORT_MAX) | |
699 | return -ENXIO; | |
700 | ||
701 | pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); | |
702 | if (!pp) | |
703 | return -ENOMEM; | |
704 | ||
705 | pp->state.mode = IEEE1284_MODE_COMPAT; | |
706 | pp->state.phase = init_phase(pp->state.mode); | |
707 | pp->flags = 0; | |
708 | pp->irqresponse = 0; | |
709 | atomic_set(&pp->irqc, 0); | |
710 | init_waitqueue_head(&pp->irq_wait); | |
711 | ||
712 | /* Defer the actual device registration until the first claim. | |
713 | * That way, we know whether or not the driver wants to have | |
714 | * exclusive access to the port (PPEXCL). | |
715 | */ | |
716 | pp->pdev = NULL; | |
717 | file->private_data = pp; | |
718 | ||
719 | return 0; | |
720 | } | |
721 | ||
722 | static int pp_release(struct inode *inode, struct file *file) | |
723 | { | |
724 | unsigned int minor = iminor(inode); | |
725 | struct pp_struct *pp = file->private_data; | |
726 | int compat_negot; | |
727 | ||
728 | compat_negot = 0; | |
729 | if (!(pp->flags & PP_CLAIMED) && pp->pdev && | |
730 | (pp->state.mode != IEEE1284_MODE_COMPAT)) { | |
731 | struct ieee1284_info *info; | |
732 | ||
733 | /* parport released, but not in compatibility mode */ | |
734 | parport_claim_or_block(pp->pdev); | |
735 | pp->flags |= PP_CLAIMED; | |
736 | info = &pp->pdev->port->ieee1284; | |
737 | pp->saved_state.mode = info->mode; | |
738 | pp->saved_state.phase = info->phase; | |
739 | info->mode = pp->state.mode; | |
740 | info->phase = pp->state.phase; | |
741 | compat_negot = 1; | |
742 | } else if ((pp->flags & PP_CLAIMED) && pp->pdev && | |
743 | (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { | |
744 | compat_negot = 2; | |
745 | } | |
746 | if (compat_negot) { | |
747 | parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); | |
748 | dev_dbg(&pp->pdev->dev, | |
749 | "negotiated back to compatibility mode because user-space forgot\n"); | |
750 | } | |
751 | ||
752 | if (pp->flags & PP_CLAIMED) { | |
753 | struct ieee1284_info *info; | |
754 | ||
755 | info = &pp->pdev->port->ieee1284; | |
756 | pp->state.mode = info->mode; | |
757 | pp->state.phase = info->phase; | |
758 | info->mode = pp->saved_state.mode; | |
759 | info->phase = pp->saved_state.phase; | |
760 | parport_release(pp->pdev); | |
761 | if (compat_negot != 1) { | |
762 | pr_debug(CHRDEV "%x: released pardevice " | |
763 | "because user-space forgot\n", minor); | |
764 | } | |
765 | } | |
766 | ||
767 | if (pp->pdev) { | |
768 | parport_unregister_device(pp->pdev); | |
769 | ida_simple_remove(&ida_index, pp->index); | |
770 | pp->pdev = NULL; | |
771 | pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); | |
772 | } | |
773 | ||
774 | kfree(pp); | |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
779 | /* No kernel lock held - fine */ | |
780 | static unsigned int pp_poll(struct file *file, poll_table *wait) | |
781 | { | |
782 | struct pp_struct *pp = file->private_data; | |
783 | unsigned int mask = 0; | |
784 | ||
785 | poll_wait(file, &pp->irq_wait, wait); | |
786 | if (atomic_read(&pp->irqc)) | |
787 | mask |= POLLIN | POLLRDNORM; | |
788 | ||
789 | return mask; | |
790 | } | |
791 | ||
792 | static struct class *ppdev_class; | |
793 | ||
794 | static const struct file_operations pp_fops = { | |
795 | .owner = THIS_MODULE, | |
796 | .llseek = no_llseek, | |
797 | .read = pp_read, | |
798 | .write = pp_write, | |
799 | .poll = pp_poll, | |
800 | .unlocked_ioctl = pp_ioctl, | |
801 | #ifdef CONFIG_COMPAT | |
802 | .compat_ioctl = pp_compat_ioctl, | |
803 | #endif | |
804 | .open = pp_open, | |
805 | .release = pp_release, | |
806 | }; | |
807 | ||
808 | static void pp_attach(struct parport *port) | |
809 | { | |
810 | struct device *ret; | |
811 | ||
812 | if (devices[port->number]) | |
813 | return; | |
814 | ||
815 | ret = device_create(ppdev_class, port->dev, | |
816 | MKDEV(PP_MAJOR, port->number), NULL, | |
817 | "parport%d", port->number); | |
818 | if (IS_ERR(ret)) { | |
819 | pr_err("Failed to create device parport%d\n", | |
820 | port->number); | |
821 | return; | |
822 | } | |
823 | devices[port->number] = ret; | |
824 | } | |
825 | ||
826 | static void pp_detach(struct parport *port) | |
827 | { | |
828 | if (!devices[port->number]) | |
829 | return; | |
830 | ||
831 | device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); | |
832 | devices[port->number] = NULL; | |
833 | } | |
834 | ||
835 | static int pp_probe(struct pardevice *par_dev) | |
836 | { | |
837 | struct device_driver *drv = par_dev->dev.driver; | |
838 | int len = strlen(drv->name); | |
839 | ||
840 | if (strncmp(par_dev->name, drv->name, len)) | |
841 | return -ENODEV; | |
842 | ||
843 | return 0; | |
844 | } | |
845 | ||
846 | static struct parport_driver pp_driver = { | |
847 | .name = CHRDEV, | |
848 | .probe = pp_probe, | |
849 | .match_port = pp_attach, | |
850 | .detach = pp_detach, | |
851 | .devmodel = true, | |
852 | }; | |
853 | ||
854 | static int __init ppdev_init(void) | |
855 | { | |
856 | int err = 0; | |
857 | ||
858 | if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { | |
859 | pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR); | |
860 | return -EIO; | |
861 | } | |
862 | ppdev_class = class_create(THIS_MODULE, CHRDEV); | |
863 | if (IS_ERR(ppdev_class)) { | |
864 | err = PTR_ERR(ppdev_class); | |
865 | goto out_chrdev; | |
866 | } | |
867 | err = parport_register_driver(&pp_driver); | |
868 | if (err < 0) { | |
869 | pr_warn(CHRDEV ": unable to register with parport\n"); | |
870 | goto out_class; | |
871 | } | |
872 | ||
873 | pr_info(PP_VERSION "\n"); | |
874 | goto out; | |
875 | ||
876 | out_class: | |
877 | class_destroy(ppdev_class); | |
878 | out_chrdev: | |
879 | unregister_chrdev(PP_MAJOR, CHRDEV); | |
880 | out: | |
881 | return err; | |
882 | } | |
883 | ||
884 | static void __exit ppdev_cleanup(void) | |
885 | { | |
886 | /* Clean up all parport stuff */ | |
887 | parport_unregister_driver(&pp_driver); | |
888 | class_destroy(ppdev_class); | |
889 | unregister_chrdev(PP_MAJOR, CHRDEV); | |
890 | } | |
891 | ||
892 | module_init(ppdev_init); | |
893 | module_exit(ppdev_cleanup); | |
894 | ||
895 | MODULE_LICENSE("GPL"); | |
896 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |