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x86: Introduce __uaccess_begin_nospec() and uaccess_try_nospec
[linux/fpc-iii.git] / drivers / parport / procfs.c
blob48804049d6972631f3179659b31bf3db3966c149
1 // SPDX-License-Identifier: GPL-2.0
2 /* Sysctl interface for parport devices.
3 *
4 * Authors: David Campbell
5 * Tim Waugh <tim@cyberelk.demon.co.uk>
6 * Philip Blundell <philb@gnu.org>
7 * Andrea Arcangeli
8 * Riccardo Facchetti <fizban@tin.it>
9 *
10 * based on work by Grant Guenther <grant@torque.net>
11 * and Philip Blundell
12 *
13 * Cleaned up include files - Russell King <linux@arm.uk.linux.org>
14 */
15
16 #include <linux/string.h>
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/errno.h>
20 #include <linux/kernel.h>
21 #include <linux/slab.h>
22 #include <linux/parport.h>
23 #include <linux/ctype.h>
24 #include <linux/sysctl.h>
25 #include <linux/device.h>
26
27 #include <linux/uaccess.h>
28
29 #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
30
31 #define PARPORT_MIN_TIMESLICE_VALUE 1ul
32 #define PARPORT_MAX_TIMESLICE_VALUE ((unsigned long) HZ)
33 #define PARPORT_MIN_SPINTIME_VALUE 1
34 #define PARPORT_MAX_SPINTIME_VALUE 1000
35
36 static int do_active_device(struct ctl_table *table, int write,
37 void __user *result, size_t *lenp, loff_t *ppos)
38 {
39 struct parport *port = (struct parport *)table->extra1;
40 char buffer[256];
41 struct pardevice *dev;
42 int len = 0;
43
44 if (write) /* can't happen anyway */
45 return -EACCES;
46
47 if (*ppos) {
48 *lenp = 0;
49 return 0;
50 }
51
52 for (dev = port->devices; dev ; dev = dev->next) {
53 if(dev == port->cad) {
54 len += sprintf(buffer, "%s\n", dev->name);
55 }
56 }
57
58 if(!len) {
59 len += sprintf(buffer, "%s\n", "none");
60 }
61
62 if (len > *lenp)
63 len = *lenp;
64 else
65 *lenp = len;
66
67 *ppos += len;
68
69 return copy_to_user(result, buffer, len) ? -EFAULT : 0;
70 }
71
72 #ifdef CONFIG_PARPORT_1284
73 static int do_autoprobe(struct ctl_table *table, int write,
74 void __user *result, size_t *lenp, loff_t *ppos)
75 {
76 struct parport_device_info *info = table->extra2;
77 const char *str;
78 char buffer[256];
79 int len = 0;
80
81 if (write) /* permissions stop this */
82 return -EACCES;
83
84 if (*ppos) {
85 *lenp = 0;
86 return 0;
87 }
88
89 if ((str = info->class_name) != NULL)
90 len += sprintf (buffer + len, "CLASS:%s;\n", str);
91
92 if ((str = info->model) != NULL)
93 len += sprintf (buffer + len, "MODEL:%s;\n", str);
94
95 if ((str = info->mfr) != NULL)
96 len += sprintf (buffer + len, "MANUFACTURER:%s;\n", str);
97
98 if ((str = info->description) != NULL)
99 len += sprintf (buffer + len, "DESCRIPTION:%s;\n", str);
100
101 if ((str = info->cmdset) != NULL)
102 len += sprintf (buffer + len, "COMMAND SET:%s;\n", str);
103
104 if (len > *lenp)
105 len = *lenp;
106 else
107 *lenp = len;
108
109 *ppos += len;
110
111 return copy_to_user (result, buffer, len) ? -EFAULT : 0;
112 }
113 #endif /* IEEE1284.3 support. */
114
115 static int do_hardware_base_addr(struct ctl_table *table, int write,
116 void __user *result,
117 size_t *lenp, loff_t *ppos)
118 {
119 struct parport *port = (struct parport *)table->extra1;
120 char buffer[20];
121 int len = 0;
122
123 if (*ppos) {
124 *lenp = 0;
125 return 0;
126 }
127
128 if (write) /* permissions prevent this anyway */
129 return -EACCES;
130
131 len += sprintf (buffer, "%lu\t%lu\n", port->base, port->base_hi);
132
133 if (len > *lenp)
134 len = *lenp;
135 else
136 *lenp = len;
137
138 *ppos += len;
139
140 return copy_to_user(result, buffer, len) ? -EFAULT : 0;
141 }
142
143 static int do_hardware_irq(struct ctl_table *table, int write,
144 void __user *result,
145 size_t *lenp, loff_t *ppos)
146 {
147 struct parport *port = (struct parport *)table->extra1;
148 char buffer[20];
149 int len = 0;
150
151 if (*ppos) {
152 *lenp = 0;
153 return 0;
154 }
155
156 if (write) /* permissions prevent this anyway */
157 return -EACCES;
158
159 len += sprintf (buffer, "%d\n", port->irq);
160
161 if (len > *lenp)
162 len = *lenp;
163 else
164 *lenp = len;
165
166 *ppos += len;
167
168 return copy_to_user(result, buffer, len) ? -EFAULT : 0;
169 }
170
171 static int do_hardware_dma(struct ctl_table *table, int write,
172 void __user *result,
173 size_t *lenp, loff_t *ppos)
174 {
175 struct parport *port = (struct parport *)table->extra1;
176 char buffer[20];
177 int len = 0;
178
179 if (*ppos) {
180 *lenp = 0;
181 return 0;
182 }
183
184 if (write) /* permissions prevent this anyway */
185 return -EACCES;
186
187 len += sprintf (buffer, "%d\n", port->dma);
188
189 if (len > *lenp)
190 len = *lenp;
191 else
192 *lenp = len;
193
194 *ppos += len;
195
196 return copy_to_user(result, buffer, len) ? -EFAULT : 0;
197 }
198
199 static int do_hardware_modes(struct ctl_table *table, int write,
200 void __user *result,
201 size_t *lenp, loff_t *ppos)
202 {
203 struct parport *port = (struct parport *)table->extra1;
204 char buffer[40];
205 int len = 0;
206
207 if (*ppos) {
208 *lenp = 0;
209 return 0;
210 }
211
212 if (write) /* permissions prevent this anyway */
213 return -EACCES;
214
215 {
216 #define printmode(x) {if(port->modes&PARPORT_MODE_##x){len+=sprintf(buffer+len,"%s%s",f?",":"",#x);f++;}}
217 int f = 0;
218 printmode(PCSPP);
219 printmode(TRISTATE);
220 printmode(COMPAT);
221 printmode(EPP);
222 printmode(ECP);
223 printmode(DMA);
224 #undef printmode
225 }
226 buffer[len++] = '\n';
227
228 if (len > *lenp)
229 len = *lenp;
230 else
231 *lenp = len;
232
233 *ppos += len;
234
235 return copy_to_user(result, buffer, len) ? -EFAULT : 0;
236 }
237
238 #define PARPORT_PORT_DIR(CHILD) { .procname = NULL, .mode = 0555, .child = CHILD }
239 #define PARPORT_PARPORT_DIR(CHILD) { .procname = "parport", \
240 .mode = 0555, .child = CHILD }
241 #define PARPORT_DEV_DIR(CHILD) { .procname = "dev", .mode = 0555, .child = CHILD }
242 #define PARPORT_DEVICES_ROOT_DIR { .procname = "devices", \
243 .mode = 0555, .child = NULL }
244
245 static const unsigned long parport_min_timeslice_value =
246 PARPORT_MIN_TIMESLICE_VALUE;
247
248 static const unsigned long parport_max_timeslice_value =
249 PARPORT_MAX_TIMESLICE_VALUE;
250
251 static const int parport_min_spintime_value =
252 PARPORT_MIN_SPINTIME_VALUE;
253
254 static const int parport_max_spintime_value =
255 PARPORT_MAX_SPINTIME_VALUE;
256
257
258 struct parport_sysctl_table {
259 struct ctl_table_header *sysctl_header;
260 struct ctl_table vars[12];
261 struct ctl_table device_dir[2];
262 struct ctl_table port_dir[2];
263 struct ctl_table parport_dir[2];
264 struct ctl_table dev_dir[2];
265 };
266
267 static const struct parport_sysctl_table parport_sysctl_template = {
268 .sysctl_header = NULL,
269 {
270 {
271 .procname = "spintime",
272 .data = NULL,
273 .maxlen = sizeof(int),
274 .mode = 0644,
275 .proc_handler = proc_dointvec_minmax,
276 .extra1 = (void*) &parport_min_spintime_value,
277 .extra2 = (void*) &parport_max_spintime_value
278 },
279 {
280 .procname = "base-addr",
281 .data = NULL,
282 .maxlen = 0,
283 .mode = 0444,
284 .proc_handler = do_hardware_base_addr
285 },
286 {
287 .procname = "irq",
288 .data = NULL,
289 .maxlen = 0,
290 .mode = 0444,
291 .proc_handler = do_hardware_irq
292 },
293 {
294 .procname = "dma",
295 .data = NULL,
296 .maxlen = 0,
297 .mode = 0444,
298 .proc_handler = do_hardware_dma
299 },
300 {
301 .procname = "modes",
302 .data = NULL,
303 .maxlen = 0,
304 .mode = 0444,
305 .proc_handler = do_hardware_modes
306 },
307 PARPORT_DEVICES_ROOT_DIR,
308 #ifdef CONFIG_PARPORT_1284
309 {
310 .procname = "autoprobe",
311 .data = NULL,
312 .maxlen = 0,
313 .mode = 0444,
314 .proc_handler = do_autoprobe
315 },
316 {
317 .procname = "autoprobe0",
318 .data = NULL,
319 .maxlen = 0,
320 .mode = 0444,
321 .proc_handler = do_autoprobe
322 },
323 {
324 .procname = "autoprobe1",
325 .data = NULL,
326 .maxlen = 0,
327 .mode = 0444,
328 .proc_handler = do_autoprobe
329 },
330 {
331 .procname = "autoprobe2",
332 .data = NULL,
333 .maxlen = 0,
334 .mode = 0444,
335 .proc_handler = do_autoprobe
336 },
337 {
338 .procname = "autoprobe3",
339 .data = NULL,
340 .maxlen = 0,
341 .mode = 0444,
342 .proc_handler = do_autoprobe
343 },
344 #endif /* IEEE 1284 support */
345 {}
346 },
347 {
348 {
349 .procname = "active",
350 .data = NULL,
351 .maxlen = 0,
352 .mode = 0444,
353 .proc_handler = do_active_device
354 },
355 {}
356 },
357 {
358 PARPORT_PORT_DIR(NULL),
359 {}
360 },
361 {
362 PARPORT_PARPORT_DIR(NULL),
363 {}
364 },
365 {
366 PARPORT_DEV_DIR(NULL),
367 {}
368 }
369 };
370
371 struct parport_device_sysctl_table
372 {
373 struct ctl_table_header *sysctl_header;
374 struct ctl_table vars[2];
375 struct ctl_table device_dir[2];
376 struct ctl_table devices_root_dir[2];
377 struct ctl_table port_dir[2];
378 struct ctl_table parport_dir[2];
379 struct ctl_table dev_dir[2];
380 };
381
382 static const struct parport_device_sysctl_table
383 parport_device_sysctl_template = {
384 .sysctl_header = NULL,
385 {
386 {
387 .procname = "timeslice",
388 .data = NULL,
389 .maxlen = sizeof(unsigned long),
390 .mode = 0644,
391 .proc_handler = proc_doulongvec_ms_jiffies_minmax,
392 .extra1 = (void*) &parport_min_timeslice_value,
393 .extra2 = (void*) &parport_max_timeslice_value
394 },
395 },
396 {
397 {
398 .procname = NULL,
399 .data = NULL,
400 .maxlen = 0,
401 .mode = 0555,
402 .child = NULL
403 },
404 {}
405 },
406 {
407 PARPORT_DEVICES_ROOT_DIR,
408 {}
409 },
410 {
411 PARPORT_PORT_DIR(NULL),
412 {}
413 },
414 {
415 PARPORT_PARPORT_DIR(NULL),
416 {}
417 },
418 {
419 PARPORT_DEV_DIR(NULL),
420 {}
421 }
422 };
423
424 struct parport_default_sysctl_table
425 {
426 struct ctl_table_header *sysctl_header;
427 struct ctl_table vars[3];
428 struct ctl_table default_dir[2];
429 struct ctl_table parport_dir[2];
430 struct ctl_table dev_dir[2];
431 };
432
433 static struct parport_default_sysctl_table
434 parport_default_sysctl_table = {
435 .sysctl_header = NULL,
436 {
437 {
438 .procname = "timeslice",
439 .data = &parport_default_timeslice,
440 .maxlen = sizeof(parport_default_timeslice),
441 .mode = 0644,
442 .proc_handler = proc_doulongvec_ms_jiffies_minmax,
443 .extra1 = (void*) &parport_min_timeslice_value,
444 .extra2 = (void*) &parport_max_timeslice_value
445 },
446 {
447 .procname = "spintime",
448 .data = &parport_default_spintime,
449 .maxlen = sizeof(parport_default_spintime),
450 .mode = 0644,
451 .proc_handler = proc_dointvec_minmax,
452 .extra1 = (void*) &parport_min_spintime_value,
453 .extra2 = (void*) &parport_max_spintime_value
454 },
455 {}
456 },
457 {
458 {
459 .procname = "default",
460 .mode = 0555,
461 .child = parport_default_sysctl_table.vars
462 },
463 {}
464 },
465 {
466 PARPORT_PARPORT_DIR(parport_default_sysctl_table.default_dir),
467 {}
468 },
469 {
470 PARPORT_DEV_DIR(parport_default_sysctl_table.parport_dir),
471 {}
472 }
473 };
474
475
476 int parport_proc_register(struct parport *port)
477 {
478 struct parport_sysctl_table *t;
479 int i;
480
481 t = kmemdup(&parport_sysctl_template, sizeof(*t), GFP_KERNEL);
482 if (t == NULL)
483 return -ENOMEM;
484
485 t->device_dir[0].extra1 = port;
486
487 for (i = 0; i < 5; i++)
488 t->vars[i].extra1 = port;
489
490 t->vars[0].data = &port->spintime;
491 t->vars[5].child = t->device_dir;
492
493 for (i = 0; i < 5; i++)
494 t->vars[6 + i].extra2 = &port->probe_info[i];
495
496 t->port_dir[0].procname = port->name;
497
498 t->port_dir[0].child = t->vars;
499 t->parport_dir[0].child = t->port_dir;
500 t->dev_dir[0].child = t->parport_dir;
501
502 t->sysctl_header = register_sysctl_table(t->dev_dir);
503 if (t->sysctl_header == NULL) {
504 kfree(t);
505 t = NULL;
506 }
507 port->sysctl_table = t;
508 return 0;
509 }
510
511 int parport_proc_unregister(struct parport *port)
512 {
513 if (port->sysctl_table) {
514 struct parport_sysctl_table *t = port->sysctl_table;
515 port->sysctl_table = NULL;
516 unregister_sysctl_table(t->sysctl_header);
517 kfree(t);
518 }
519 return 0;
520 }
521
522 int parport_device_proc_register(struct pardevice *device)
523 {
524 struct parport_device_sysctl_table *t;
525 struct parport * port = device->port;
526
527 t = kmemdup(&parport_device_sysctl_template, sizeof(*t), GFP_KERNEL);
528 if (t == NULL)
529 return -ENOMEM;
530
531 t->dev_dir[0].child = t->parport_dir;
532 t->parport_dir[0].child = t->port_dir;
533 t->port_dir[0].procname = port->name;
534 t->port_dir[0].child = t->devices_root_dir;
535 t->devices_root_dir[0].child = t->device_dir;
536
537 t->device_dir[0].procname = device->name;
538 t->device_dir[0].child = t->vars;
539 t->vars[0].data = &device->timeslice;
540
541 t->sysctl_header = register_sysctl_table(t->dev_dir);
542 if (t->sysctl_header == NULL) {
543 kfree(t);
544 t = NULL;
545 }
546 device->sysctl_table = t;
547 return 0;
548 }
549
550 int parport_device_proc_unregister(struct pardevice *device)
551 {
552 if (device->sysctl_table) {
553 struct parport_device_sysctl_table *t = device->sysctl_table;
554 device->sysctl_table = NULL;
555 unregister_sysctl_table(t->sysctl_header);
556 kfree(t);
557 }
558 return 0;
559 }
560
561 static int __init parport_default_proc_register(void)
562 {
563 int ret;
564
565 parport_default_sysctl_table.sysctl_header =
566 register_sysctl_table(parport_default_sysctl_table.dev_dir);
567 if (!parport_default_sysctl_table.sysctl_header)
568 return -ENOMEM;
569 ret = parport_bus_init();
570 if (ret) {
571 unregister_sysctl_table(parport_default_sysctl_table.
572 sysctl_header);
573 return ret;
574 }
575 return 0;
576 }
577
578 static void __exit parport_default_proc_unregister(void)
579 {
580 if (parport_default_sysctl_table.sysctl_header) {
581 unregister_sysctl_table(parport_default_sysctl_table.
582 sysctl_header);
583 parport_default_sysctl_table.sysctl_header = NULL;
584 }
585 parport_bus_exit();
586 }
587
588 #else /* no sysctl or no procfs*/
589
590 int parport_proc_register(struct parport *pp)
591 {
592 return 0;
593 }
594
595 int parport_proc_unregister(struct parport *pp)
596 {
597 return 0;
598 }
599
600 int parport_device_proc_register(struct pardevice *device)
601 {
602 return 0;
603 }
604
605 int parport_device_proc_unregister(struct pardevice *device)
606 {
607 return 0;
608 }
609
610 static int __init parport_default_proc_register (void)
611 {
612 return parport_bus_init();
613 }
614
615 static void __exit parport_default_proc_unregister (void)
616 {
617 parport_bus_exit();
618 }
619 #endif
620
621 subsys_initcall(parport_default_proc_register)
622 module_exit(parport_default_proc_unregister)
Linux with added FPC-III support