Commit | Line | Data |
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1da177e4 LT |
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> | |
1da177e4 LT |
63 | #include <linux/ioctl.h> |
64 | #include <linux/parport.h> | |
65 | #include <linux/ctype.h> | |
66 | #include <linux/poll.h> | |
5a0e3ad6 | 67 | #include <linux/slab.h> |
e6a67846 | 68 | #include <linux/major.h> |
1da177e4 | 69 | #include <linux/ppdev.h> |
613655fa | 70 | #include <linux/mutex.h> |
6d535d3e | 71 | #include <linux/uaccess.h> |
17a3596f | 72 | #include <linux/compat.h> |
1da177e4 LT |
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 | }; | |
88 | ||
89 | /* pp_struct.flags bitfields */ | |
90 | #define PP_CLAIMED (1<<0) | |
91 | #define PP_EXCL (1<<1) | |
92 | ||
93 | /* Other constants */ | |
94 | #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ | |
95 | #define PP_BUFFER_SIZE 1024 | |
96 | #define PARDEVICE_MAX 8 | |
97 | ||
98 | /* ROUND_UP macro from fs/select.c */ | |
99 | #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) | |
100 | ||
613655fa | 101 | static DEFINE_MUTEX(pp_do_mutex); |
3b9ab374 BJZ |
102 | |
103 | /* define fixed sized ioctl cmd for y2038 migration */ | |
104 | #define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2]) | |
105 | #define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2]) | |
106 | #define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2]) | |
107 | #define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2]) | |
108 | ||
783ea44d | 109 | static inline void pp_enable_irq(struct pp_struct *pp) |
1da177e4 LT |
110 | { |
111 | struct parport *port = pp->pdev->port; | |
783ea44d | 112 | port->ops->enable_irq(port); |
1da177e4 LT |
113 | } |
114 | ||
783ea44d | 115 | static ssize_t pp_read(struct file * file, char __user * buf, size_t count, |
1da177e4 LT |
116 | loff_t * ppos) |
117 | { | |
496ad9aa | 118 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 LT |
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 */ | |
81fc401e | 127 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
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 | } | |
139 | pport = pp->pdev->port; | |
140 | mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
141 | ||
783ea44d | 142 | parport_set_timeout(pp->pdev, |
1da177e4 LT |
143 | (file->f_flags & O_NONBLOCK) ? |
144 | PARPORT_INACTIVITY_O_NONBLOCK : | |
145 | pp->default_inactivity); | |
146 | ||
147 | while (bytes_read == 0) { | |
148 | ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); | |
149 | ||
150 | if (mode == IEEE1284_MODE_EPP) { | |
151 | /* various specials for EPP mode */ | |
152 | int flags = 0; | |
153 | size_t (*fn)(struct parport *, void *, size_t, int); | |
154 | ||
155 | if (pp->flags & PP_W91284PIC) { | |
156 | flags |= PARPORT_W91284PIC; | |
157 | } | |
158 | if (pp->flags & PP_FASTREAD) { | |
159 | flags |= PARPORT_EPP_FAST; | |
160 | } | |
161 | if (pport->ieee1284.mode & IEEE1284_ADDR) { | |
162 | fn = pport->ops->epp_read_addr; | |
163 | } else { | |
164 | fn = pport->ops->epp_read_data; | |
165 | } | |
166 | bytes_read = (*fn)(pport, kbuffer, need, flags); | |
167 | } else { | |
783ea44d | 168 | bytes_read = parport_read(pport, kbuffer, need); |
1da177e4 LT |
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 | ||
783ea44d | 179 | if (signal_pending(current)) { |
1da177e4 LT |
180 | bytes_read = -ERESTARTSYS; |
181 | break; | |
182 | } | |
183 | ||
184 | cond_resched(); | |
185 | } | |
186 | ||
783ea44d | 187 | parport_set_timeout(pp->pdev, pp->default_inactivity); |
1da177e4 | 188 | |
783ea44d | 189 | if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read)) |
1da177e4 LT |
190 | bytes_read = -EFAULT; |
191 | ||
783ea44d SM |
192 | kfree(kbuffer); |
193 | pp_enable_irq(pp); | |
1da177e4 LT |
194 | return bytes_read; |
195 | } | |
196 | ||
783ea44d | 197 | static ssize_t pp_write(struct file * file, const char __user * buf, |
1da177e4 LT |
198 | size_t count, loff_t * ppos) |
199 | { | |
496ad9aa | 200 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 LT |
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 */ | |
81fc401e | 210 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
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 | ||
783ea44d | 221 | parport_set_timeout(pp->pdev, |
1da177e4 LT |
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 | ||
783ea44d | 229 | if (copy_from_user(kbuffer, buf + bytes_written, n)) { |
1da177e4 LT |
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) { | |
783ea44d | 237 | wrote = pport->ops->epp_write_addr(pport, |
1da177e4 LT |
238 | kbuffer, n, PARPORT_EPP_FAST); |
239 | } else { | |
783ea44d | 240 | wrote = pport->ops->epp_write_data(pport, |
1da177e4 LT |
241 | kbuffer, n, PARPORT_EPP_FAST); |
242 | } | |
243 | } else { | |
783ea44d | 244 | wrote = parport_write(pp->pdev->port, kbuffer, n); |
1da177e4 LT |
245 | } |
246 | ||
247 | if (wrote <= 0) { | |
248 | if (!bytes_written) { | |
249 | bytes_written = wrote; | |
250 | } | |
251 | break; | |
252 | } | |
253 | ||
254 | bytes_written += wrote; | |
255 | ||
256 | if (file->f_flags & O_NONBLOCK) { | |
257 | if (!bytes_written) | |
258 | bytes_written = -EAGAIN; | |
259 | break; | |
260 | } | |
261 | ||
783ea44d | 262 | if (signal_pending(current)) |
1da177e4 | 263 | break; |
1da177e4 LT |
264 | |
265 | cond_resched(); | |
266 | } | |
267 | ||
783ea44d | 268 | parport_set_timeout(pp->pdev, pp->default_inactivity); |
1da177e4 | 269 | |
783ea44d SM |
270 | kfree(kbuffer); |
271 | pp_enable_irq(pp); | |
1da177e4 LT |
272 | return bytes_written; |
273 | } | |
274 | ||
783ea44d | 275 | static void pp_irq(void *private) |
1da177e4 | 276 | { |
5712cb3d | 277 | struct pp_struct *pp = private; |
1da177e4 LT |
278 | |
279 | if (pp->irqresponse) { | |
783ea44d | 280 | parport_write_control(pp->pdev->port, pp->irqctl); |
1da177e4 LT |
281 | pp->irqresponse = 0; |
282 | } | |
283 | ||
783ea44d SM |
284 | atomic_inc(&pp->irqc); |
285 | wake_up_interruptible(&pp->irq_wait); | |
1da177e4 LT |
286 | } |
287 | ||
783ea44d | 288 | static int register_device(int minor, struct pp_struct *pp) |
1da177e4 LT |
289 | { |
290 | struct parport *port; | |
291 | struct pardevice * pdev = NULL; | |
292 | char *name; | |
293 | int fl; | |
294 | ||
87575437 | 295 | name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); |
1da177e4 LT |
296 | if (name == NULL) |
297 | return -ENOMEM; | |
298 | ||
783ea44d | 299 | port = parport_find_number(minor); |
1da177e4 | 300 | if (!port) { |
783ea44d SM |
301 | printk(KERN_WARNING "%s: no associated port!\n", name); |
302 | kfree(name); | |
1da177e4 LT |
303 | return -ENXIO; |
304 | } | |
305 | ||
306 | fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; | |
783ea44d | 307 | pdev = parport_register_device(port, name, NULL, |
1da177e4 | 308 | NULL, pp_irq, fl, pp); |
783ea44d | 309 | parport_put_port(port); |
1da177e4 LT |
310 | |
311 | if (!pdev) { | |
783ea44d SM |
312 | printk(KERN_WARNING "%s: failed to register device!\n", name); |
313 | kfree(name); | |
1da177e4 LT |
314 | return -ENXIO; |
315 | } | |
316 | ||
317 | pp->pdev = pdev; | |
81fc401e | 318 | pr_debug("%s: registered pardevice\n", name); |
1da177e4 LT |
319 | return 0; |
320 | } | |
321 | ||
783ea44d | 322 | static enum ieee1284_phase init_phase(int mode) |
1da177e4 LT |
323 | { |
324 | switch (mode & ~(IEEE1284_DEVICEID | |
325 | | IEEE1284_ADDR)) { | |
326 | case IEEE1284_MODE_NIBBLE: | |
327 | case IEEE1284_MODE_BYTE: | |
328 | return IEEE1284_PH_REV_IDLE; | |
329 | } | |
330 | return IEEE1284_PH_FWD_IDLE; | |
331 | } | |
332 | ||
3b9ab374 BJZ |
333 | static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) |
334 | { | |
335 | long to_jiffies; | |
336 | ||
337 | if ((tv_sec < 0) || (tv_usec < 0)) | |
338 | return -EINVAL; | |
339 | ||
340 | to_jiffies = usecs_to_jiffies(tv_usec); | |
341 | to_jiffies += tv_sec * HZ; | |
342 | if (to_jiffies <= 0) | |
343 | return -EINVAL; | |
344 | ||
345 | pdev->timeout = to_jiffies; | |
346 | return 0; | |
347 | } | |
348 | ||
6d535d3e | 349 | static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 | 350 | { |
496ad9aa | 351 | unsigned int minor = iminor(file_inode(file)); |
1da177e4 LT |
352 | struct pp_struct *pp = file->private_data; |
353 | struct parport * port; | |
354 | void __user *argp = (void __user *)arg; | |
355 | ||
356 | /* First handle the cases that don't take arguments. */ | |
357 | switch (cmd) { | |
358 | case PPCLAIM: | |
359 | { | |
360 | struct ieee1284_info *info; | |
361 | int ret; | |
362 | ||
363 | if (pp->flags & PP_CLAIMED) { | |
81fc401e | 364 | pr_debug(CHRDEV "%x: you've already got it!\n", minor); |
1da177e4 LT |
365 | return -EINVAL; |
366 | } | |
367 | ||
368 | /* Deferred device registration. */ | |
369 | if (!pp->pdev) { | |
783ea44d | 370 | int err = register_device(minor, pp); |
1da177e4 LT |
371 | if (err) { |
372 | return err; | |
373 | } | |
374 | } | |
375 | ||
783ea44d | 376 | ret = parport_claim_or_block(pp->pdev); |
1da177e4 LT |
377 | if (ret < 0) |
378 | return ret; | |
379 | ||
380 | pp->flags |= PP_CLAIMED; | |
381 | ||
382 | /* For interrupt-reporting to work, we need to be | |
383 | * informed of each interrupt. */ | |
783ea44d | 384 | pp_enable_irq(pp); |
1da177e4 LT |
385 | |
386 | /* We may need to fix up the state machine. */ | |
387 | info = &pp->pdev->port->ieee1284; | |
388 | pp->saved_state.mode = info->mode; | |
389 | pp->saved_state.phase = info->phase; | |
390 | info->mode = pp->state.mode; | |
391 | info->phase = pp->state.phase; | |
783ea44d SM |
392 | pp->default_inactivity = parport_set_timeout(pp->pdev, 0); |
393 | parport_set_timeout(pp->pdev, pp->default_inactivity); | |
1da177e4 LT |
394 | |
395 | return 0; | |
396 | } | |
397 | case PPEXCL: | |
398 | if (pp->pdev) { | |
81fc401e | 399 | pr_debug(CHRDEV "%x: too late for PPEXCL; " |
1da177e4 LT |
400 | "already registered\n", minor); |
401 | if (pp->flags & PP_EXCL) | |
402 | /* But it's not really an error. */ | |
403 | return 0; | |
404 | /* There's no chance of making the driver happy. */ | |
405 | return -EINVAL; | |
406 | } | |
407 | ||
408 | /* Just remember to register the device exclusively | |
409 | * when we finally do the registration. */ | |
410 | pp->flags |= PP_EXCL; | |
411 | return 0; | |
412 | case PPSETMODE: | |
413 | { | |
414 | int mode; | |
783ea44d | 415 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 LT |
416 | return -EFAULT; |
417 | /* FIXME: validate mode */ | |
418 | pp->state.mode = mode; | |
783ea44d | 419 | pp->state.phase = init_phase(mode); |
1da177e4 LT |
420 | |
421 | if (pp->flags & PP_CLAIMED) { | |
422 | pp->pdev->port->ieee1284.mode = mode; | |
423 | pp->pdev->port->ieee1284.phase = pp->state.phase; | |
424 | } | |
425 | ||
426 | return 0; | |
427 | } | |
428 | case PPGETMODE: | |
429 | { | |
430 | int mode; | |
431 | ||
432 | if (pp->flags & PP_CLAIMED) { | |
433 | mode = pp->pdev->port->ieee1284.mode; | |
434 | } else { | |
435 | mode = pp->state.mode; | |
436 | } | |
783ea44d | 437 | if (copy_to_user(argp, &mode, sizeof(mode))) { |
1da177e4 LT |
438 | return -EFAULT; |
439 | } | |
440 | return 0; | |
441 | } | |
442 | case PPSETPHASE: | |
443 | { | |
444 | int phase; | |
783ea44d | 445 | if (copy_from_user(&phase, argp, sizeof(phase))) { |
1da177e4 LT |
446 | return -EFAULT; |
447 | } | |
448 | /* FIXME: validate phase */ | |
449 | pp->state.phase = phase; | |
450 | ||
451 | if (pp->flags & PP_CLAIMED) { | |
452 | pp->pdev->port->ieee1284.phase = phase; | |
453 | } | |
454 | ||
455 | return 0; | |
456 | } | |
457 | case PPGETPHASE: | |
458 | { | |
459 | int phase; | |
460 | ||
461 | if (pp->flags & PP_CLAIMED) { | |
462 | phase = pp->pdev->port->ieee1284.phase; | |
463 | } else { | |
464 | phase = pp->state.phase; | |
465 | } | |
783ea44d | 466 | if (copy_to_user(argp, &phase, sizeof(phase))) { |
1da177e4 LT |
467 | return -EFAULT; |
468 | } | |
469 | return 0; | |
470 | } | |
471 | case PPGETMODES: | |
472 | { | |
473 | unsigned int modes; | |
474 | ||
783ea44d | 475 | port = parport_find_number(minor); |
1da177e4 LT |
476 | if (!port) |
477 | return -ENODEV; | |
478 | ||
479 | modes = port->modes; | |
d98808a2 | 480 | parport_put_port(port); |
783ea44d | 481 | if (copy_to_user(argp, &modes, sizeof(modes))) { |
1da177e4 LT |
482 | return -EFAULT; |
483 | } | |
484 | return 0; | |
485 | } | |
486 | case PPSETFLAGS: | |
487 | { | |
488 | int uflags; | |
489 | ||
783ea44d | 490 | if (copy_from_user(&uflags, argp, sizeof(uflags))) { |
1da177e4 LT |
491 | return -EFAULT; |
492 | } | |
493 | pp->flags &= ~PP_FLAGMASK; | |
494 | pp->flags |= (uflags & PP_FLAGMASK); | |
495 | return 0; | |
496 | } | |
497 | case PPGETFLAGS: | |
498 | { | |
499 | int uflags; | |
500 | ||
501 | uflags = pp->flags & PP_FLAGMASK; | |
783ea44d | 502 | if (copy_to_user(argp, &uflags, sizeof(uflags))) { |
1da177e4 LT |
503 | return -EFAULT; |
504 | } | |
505 | return 0; | |
506 | } | |
507 | } /* end switch() */ | |
508 | ||
509 | /* Everything else requires the port to be claimed, so check | |
510 | * that now. */ | |
511 | if ((pp->flags & PP_CLAIMED) == 0) { | |
81fc401e | 512 | pr_debug(CHRDEV "%x: claim the port first\n", minor); |
1da177e4 LT |
513 | return -EINVAL; |
514 | } | |
515 | ||
516 | port = pp->pdev->port; | |
517 | switch (cmd) { | |
518 | struct ieee1284_info *info; | |
519 | unsigned char reg; | |
520 | unsigned char mask; | |
521 | int mode; | |
3b9ab374 BJZ |
522 | s32 time32[2]; |
523 | s64 time64[2]; | |
524 | struct timespec64 ts; | |
1da177e4 | 525 | int ret; |
1da177e4 LT |
526 | |
527 | case PPRSTATUS: | |
783ea44d SM |
528 | reg = parport_read_status(port); |
529 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
530 | return -EFAULT; |
531 | return 0; | |
532 | case PPRDATA: | |
783ea44d SM |
533 | reg = parport_read_data(port); |
534 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
535 | return -EFAULT; |
536 | return 0; | |
537 | case PPRCONTROL: | |
783ea44d SM |
538 | reg = parport_read_control(port); |
539 | if (copy_to_user(argp, ®, sizeof(reg))) | |
1da177e4 LT |
540 | return -EFAULT; |
541 | return 0; | |
542 | case PPYIELD: | |
783ea44d | 543 | parport_yield_blocking(pp->pdev); |
1da177e4 LT |
544 | return 0; |
545 | ||
546 | case PPRELEASE: | |
547 | /* Save the state machine's state. */ | |
548 | info = &pp->pdev->port->ieee1284; | |
549 | pp->state.mode = info->mode; | |
550 | pp->state.phase = info->phase; | |
551 | info->mode = pp->saved_state.mode; | |
552 | info->phase = pp->saved_state.phase; | |
783ea44d | 553 | parport_release(pp->pdev); |
1da177e4 LT |
554 | pp->flags &= ~PP_CLAIMED; |
555 | return 0; | |
556 | ||
557 | case PPWCONTROL: | |
783ea44d | 558 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 | 559 | return -EFAULT; |
783ea44d | 560 | parport_write_control(port, reg); |
1da177e4 LT |
561 | return 0; |
562 | ||
563 | case PPWDATA: | |
783ea44d | 564 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 | 565 | return -EFAULT; |
783ea44d | 566 | parport_write_data(port, reg); |
1da177e4 LT |
567 | return 0; |
568 | ||
569 | case PPFCONTROL: | |
783ea44d SM |
570 | if (copy_from_user(&mask, argp, |
571 | sizeof(mask))) | |
1da177e4 | 572 | return -EFAULT; |
783ea44d SM |
573 | if (copy_from_user(®, 1 + (unsigned char __user *) arg, |
574 | sizeof(reg))) | |
1da177e4 | 575 | return -EFAULT; |
783ea44d | 576 | parport_frob_control(port, mask, reg); |
1da177e4 LT |
577 | return 0; |
578 | ||
579 | case PPDATADIR: | |
783ea44d | 580 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 LT |
581 | return -EFAULT; |
582 | if (mode) | |
783ea44d | 583 | port->ops->data_reverse(port); |
1da177e4 | 584 | else |
783ea44d | 585 | port->ops->data_forward(port); |
1da177e4 LT |
586 | return 0; |
587 | ||
588 | case PPNEGOT: | |
783ea44d | 589 | if (copy_from_user(&mode, argp, sizeof(mode))) |
1da177e4 | 590 | return -EFAULT; |
783ea44d | 591 | switch ((ret = parport_negotiate(port, mode))) { |
1da177e4 LT |
592 | case 0: break; |
593 | case -1: /* handshake failed, peripheral not IEEE 1284 */ | |
594 | ret = -EIO; | |
595 | break; | |
596 | case 1: /* handshake succeeded, peripheral rejected mode */ | |
597 | ret = -ENXIO; | |
598 | break; | |
599 | } | |
783ea44d | 600 | pp_enable_irq(pp); |
1da177e4 LT |
601 | return ret; |
602 | ||
603 | case PPWCTLONIRQ: | |
783ea44d | 604 | if (copy_from_user(®, argp, sizeof(reg))) |
1da177e4 LT |
605 | return -EFAULT; |
606 | ||
607 | /* Remember what to set the control lines to, for next | |
608 | * time we get an interrupt. */ | |
609 | pp->irqctl = reg; | |
610 | pp->irqresponse = 1; | |
611 | return 0; | |
612 | ||
613 | case PPCLRIRQ: | |
783ea44d SM |
614 | ret = atomic_read(&pp->irqc); |
615 | if (copy_to_user(argp, &ret, sizeof(ret))) | |
1da177e4 | 616 | return -EFAULT; |
783ea44d | 617 | atomic_sub(ret, &pp->irqc); |
1da177e4 LT |
618 | return 0; |
619 | ||
3b9ab374 BJZ |
620 | case PPSETTIME32: |
621 | if (copy_from_user(time32, argp, sizeof(time32))) | |
1da177e4 | 622 | return -EFAULT; |
3b9ab374 BJZ |
623 | |
624 | return pp_set_timeout(pp->pdev, time32[0], time32[1]); | |
625 | ||
626 | case PPSETTIME64: | |
627 | if (copy_from_user(time64, argp, sizeof(time64))) | |
628 | return -EFAULT; | |
629 | ||
630 | return pp_set_timeout(pp->pdev, time64[0], time64[1]); | |
631 | ||
632 | case PPGETTIME32: | |
633 | jiffies_to_timespec64(pp->pdev->timeout, &ts); | |
634 | time32[0] = ts.tv_sec; | |
635 | time32[1] = ts.tv_nsec / NSEC_PER_USEC; | |
636 | if ((time32[0] < 0) || (time32[1] < 0)) | |
1da177e4 | 637 | return -EINVAL; |
3b9ab374 BJZ |
638 | |
639 | if (copy_to_user(argp, time32, sizeof(time32))) | |
640 | return -EFAULT; | |
641 | ||
1da177e4 LT |
642 | return 0; |
643 | ||
3b9ab374 BJZ |
644 | case PPGETTIME64: |
645 | jiffies_to_timespec64(pp->pdev->timeout, &ts); | |
646 | time64[0] = ts.tv_sec; | |
647 | time64[1] = ts.tv_nsec / NSEC_PER_USEC; | |
648 | if ((time64[0] < 0) || (time64[1] < 0)) | |
649 | return -EINVAL; | |
650 | ||
651 | if (copy_to_user(argp, time64, sizeof(time64))) | |
1da177e4 | 652 | return -EFAULT; |
3b9ab374 | 653 | |
1da177e4 LT |
654 | return 0; |
655 | ||
656 | default: | |
81fc401e | 657 | pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd); |
1da177e4 LT |
658 | return -EINVAL; |
659 | } | |
660 | ||
661 | /* Keep the compiler happy */ | |
662 | return 0; | |
663 | } | |
664 | ||
6d535d3e AC |
665 | static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
666 | { | |
667 | long ret; | |
613655fa | 668 | mutex_lock(&pp_do_mutex); |
6d535d3e | 669 | ret = pp_do_ioctl(file, cmd, arg); |
613655fa | 670 | mutex_unlock(&pp_do_mutex); |
6d535d3e AC |
671 | return ret; |
672 | } | |
673 | ||
17a3596f BJZ |
674 | #ifdef CONFIG_COMPAT |
675 | static long pp_compat_ioctl(struct file *file, unsigned int cmd, | |
676 | unsigned long arg) | |
677 | { | |
678 | return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
679 | } | |
680 | #endif | |
681 | ||
783ea44d | 682 | static int pp_open(struct inode * inode, struct file * file) |
1da177e4 LT |
683 | { |
684 | unsigned int minor = iminor(inode); | |
685 | struct pp_struct *pp; | |
686 | ||
687 | if (minor >= PARPORT_MAX) | |
688 | return -ENXIO; | |
689 | ||
783ea44d | 690 | pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); |
1da177e4 LT |
691 | if (!pp) |
692 | return -ENOMEM; | |
693 | ||
694 | pp->state.mode = IEEE1284_MODE_COMPAT; | |
783ea44d | 695 | pp->state.phase = init_phase(pp->state.mode); |
1da177e4 LT |
696 | pp->flags = 0; |
697 | pp->irqresponse = 0; | |
783ea44d SM |
698 | atomic_set(&pp->irqc, 0); |
699 | init_waitqueue_head(&pp->irq_wait); | |
1da177e4 LT |
700 | |
701 | /* Defer the actual device registration until the first claim. | |
702 | * That way, we know whether or not the driver wants to have | |
703 | * exclusive access to the port (PPEXCL). | |
704 | */ | |
705 | pp->pdev = NULL; | |
706 | file->private_data = pp; | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
783ea44d | 711 | static int pp_release(struct inode * inode, struct file * file) |
1da177e4 LT |
712 | { |
713 | unsigned int minor = iminor(inode); | |
714 | struct pp_struct *pp = file->private_data; | |
715 | int compat_negot; | |
716 | ||
717 | compat_negot = 0; | |
718 | if (!(pp->flags & PP_CLAIMED) && pp->pdev && | |
719 | (pp->state.mode != IEEE1284_MODE_COMPAT)) { | |
720 | struct ieee1284_info *info; | |
721 | ||
722 | /* parport released, but not in compatibility mode */ | |
783ea44d | 723 | parport_claim_or_block(pp->pdev); |
1da177e4 LT |
724 | pp->flags |= PP_CLAIMED; |
725 | info = &pp->pdev->port->ieee1284; | |
726 | pp->saved_state.mode = info->mode; | |
727 | pp->saved_state.phase = info->phase; | |
728 | info->mode = pp->state.mode; | |
729 | info->phase = pp->state.phase; | |
730 | compat_negot = 1; | |
731 | } else if ((pp->flags & PP_CLAIMED) && pp->pdev && | |
732 | (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { | |
733 | compat_negot = 2; | |
734 | } | |
735 | if (compat_negot) { | |
783ea44d | 736 | parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); |
81fc401e MB |
737 | pr_debug(CHRDEV "%x: negotiated back to compatibility " |
738 | "mode because user-space forgot\n", minor); | |
1da177e4 LT |
739 | } |
740 | ||
741 | if (pp->flags & PP_CLAIMED) { | |
742 | struct ieee1284_info *info; | |
743 | ||
744 | info = &pp->pdev->port->ieee1284; | |
745 | pp->state.mode = info->mode; | |
746 | pp->state.phase = info->phase; | |
747 | info->mode = pp->saved_state.mode; | |
748 | info->phase = pp->saved_state.phase; | |
783ea44d | 749 | parport_release(pp->pdev); |
1da177e4 | 750 | if (compat_negot != 1) { |
81fc401e | 751 | pr_debug(CHRDEV "%x: released pardevice " |
1da177e4 LT |
752 | "because user-space forgot\n", minor); |
753 | } | |
754 | } | |
755 | ||
756 | if (pp->pdev) { | |
757 | const char *name = pp->pdev->name; | |
783ea44d SM |
758 | parport_unregister_device(pp->pdev); |
759 | kfree(name); | |
1da177e4 | 760 | pp->pdev = NULL; |
81fc401e | 761 | pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); |
1da177e4 LT |
762 | } |
763 | ||
783ea44d | 764 | kfree(pp); |
1da177e4 LT |
765 | |
766 | return 0; | |
767 | } | |
768 | ||
769 | /* No kernel lock held - fine */ | |
783ea44d | 770 | static unsigned int pp_poll(struct file * file, poll_table * wait) |
1da177e4 LT |
771 | { |
772 | struct pp_struct *pp = file->private_data; | |
773 | unsigned int mask = 0; | |
774 | ||
783ea44d SM |
775 | poll_wait(file, &pp->irq_wait, wait); |
776 | if (atomic_read(&pp->irqc)) | |
1da177e4 LT |
777 | mask |= POLLIN | POLLRDNORM; |
778 | ||
779 | return mask; | |
780 | } | |
781 | ||
ca8eca68 | 782 | static struct class *ppdev_class; |
1da177e4 | 783 | |
62322d25 | 784 | static const struct file_operations pp_fops = { |
1da177e4 LT |
785 | .owner = THIS_MODULE, |
786 | .llseek = no_llseek, | |
787 | .read = pp_read, | |
788 | .write = pp_write, | |
789 | .poll = pp_poll, | |
6d535d3e | 790 | .unlocked_ioctl = pp_ioctl, |
17a3596f BJZ |
791 | #ifdef CONFIG_COMPAT |
792 | .compat_ioctl = pp_compat_ioctl, | |
793 | #endif | |
1da177e4 LT |
794 | .open = pp_open, |
795 | .release = pp_release, | |
796 | }; | |
797 | ||
798 | static void pp_attach(struct parport *port) | |
799 | { | |
03457cd4 GKH |
800 | device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), |
801 | NULL, "parport%d", port->number); | |
1da177e4 LT |
802 | } |
803 | ||
804 | static void pp_detach(struct parport *port) | |
805 | { | |
04880eda | 806 | device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); |
1da177e4 LT |
807 | } |
808 | ||
809 | static struct parport_driver pp_driver = { | |
810 | .name = CHRDEV, | |
811 | .attach = pp_attach, | |
812 | .detach = pp_detach, | |
813 | }; | |
814 | ||
783ea44d | 815 | static int __init ppdev_init(void) |
1da177e4 | 816 | { |
8ab5e4c1 | 817 | int err = 0; |
1da177e4 | 818 | |
783ea44d SM |
819 | if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { |
820 | printk(KERN_WARNING CHRDEV ": unable to get major %d\n", | |
1da177e4 LT |
821 | PP_MAJOR); |
822 | return -EIO; | |
823 | } | |
ca8eca68 | 824 | ppdev_class = class_create(THIS_MODULE, CHRDEV); |
1da177e4 LT |
825 | if (IS_ERR(ppdev_class)) { |
826 | err = PTR_ERR(ppdev_class); | |
827 | goto out_chrdev; | |
828 | } | |
9a32bb39 AK |
829 | err = parport_register_driver(&pp_driver); |
830 | if (err < 0) { | |
783ea44d | 831 | printk(KERN_WARNING CHRDEV ": unable to register with parport\n"); |
1da177e4 LT |
832 | goto out_class; |
833 | } | |
834 | ||
783ea44d | 835 | printk(KERN_INFO PP_VERSION "\n"); |
1da177e4 LT |
836 | goto out; |
837 | ||
838 | out_class: | |
ca8eca68 | 839 | class_destroy(ppdev_class); |
1da177e4 LT |
840 | out_chrdev: |
841 | unregister_chrdev(PP_MAJOR, CHRDEV); | |
842 | out: | |
843 | return err; | |
844 | } | |
845 | ||
783ea44d | 846 | static void __exit ppdev_cleanup(void) |
1da177e4 | 847 | { |
1da177e4 | 848 | /* Clean up all parport stuff */ |
1da177e4 | 849 | parport_unregister_driver(&pp_driver); |
ca8eca68 | 850 | class_destroy(ppdev_class); |
783ea44d | 851 | unregister_chrdev(PP_MAJOR, CHRDEV); |
1da177e4 LT |
852 | } |
853 | ||
854 | module_init(ppdev_init); | |
855 | module_exit(ppdev_cleanup); | |
856 | ||
857 | MODULE_LICENSE("GPL"); | |
858 | MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); |