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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / parport / procfs.c
blob3880460e67f25a7d8708a734c6f4d9e6c363c726
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(const struct ctl_table *table, int write,
37 void *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 += scnprintf(buffer, sizeof(buffer), "%s\n", dev->name);
55 }
56 }
57
58 if(!len) {
59 len += scnprintf(buffer, sizeof(buffer), "%s\n", "none");
60 }
61
62 if (len > *lenp)
63 len = *lenp;
64 else
65 *lenp = len;
66
67 *ppos += len;
68 memcpy(result, buffer, len);
69 return 0;
70 }
71
72 #ifdef CONFIG_PARPORT_1284
73 static int do_autoprobe(const struct ctl_table *table, int write,
74 void *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 += scnprintf (buffer + len, sizeof(buffer) - len, "CLASS:%s;\n", str);
91
92 if ((str = info->model) != NULL)
93 len += scnprintf (buffer + len, sizeof(buffer) - len, "MODEL:%s;\n", str);
94
95 if ((str = info->mfr) != NULL)
96 len += scnprintf (buffer + len, sizeof(buffer) - len, "MANUFACTURER:%s;\n", str);
97
98 if ((str = info->description) != NULL)
99 len += scnprintf (buffer + len, sizeof(buffer) - len, "DESCRIPTION:%s;\n", str);
100
101 if ((str = info->cmdset) != NULL)
102 len += scnprintf (buffer + len, sizeof(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 memcpy(result, buffer, len);
112 return 0;
113 }
114 #endif /* IEEE1284.3 support. */
115
116 static int do_hardware_base_addr(const struct ctl_table *table, int write,
117 void *result, size_t *lenp, loff_t *ppos)
118 {
119 struct parport *port = (struct parport *)table->extra1;
120 char buffer[64];
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 += scnprintf (buffer, sizeof(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 memcpy(result, buffer, len);
140 return 0;
141 }
142
143 static int do_hardware_irq(const struct ctl_table *table, int write,
144 void *result, size_t *lenp, loff_t *ppos)
145 {
146 struct parport *port = (struct parport *)table->extra1;
147 char buffer[20];
148 int len = 0;
149
150 if (*ppos) {
151 *lenp = 0;
152 return 0;
153 }
154
155 if (write) /* permissions prevent this anyway */
156 return -EACCES;
157
158 len += scnprintf (buffer, sizeof(buffer), "%d\n", port->irq);
159
160 if (len > *lenp)
161 len = *lenp;
162 else
163 *lenp = len;
164
165 *ppos += len;
166 memcpy(result, buffer, len);
167 return 0;
168 }
169
170 static int do_hardware_dma(const struct ctl_table *table, int write,
171 void *result, size_t *lenp, loff_t *ppos)
172 {
173 struct parport *port = (struct parport *)table->extra1;
174 char buffer[20];
175 int len = 0;
176
177 if (*ppos) {
178 *lenp = 0;
179 return 0;
180 }
181
182 if (write) /* permissions prevent this anyway */
183 return -EACCES;
184
185 len += scnprintf (buffer, sizeof(buffer), "%d\n", port->dma);
186
187 if (len > *lenp)
188 len = *lenp;
189 else
190 *lenp = len;
191
192 *ppos += len;
193 memcpy(result, buffer, len);
194 return 0;
195 }
196
197 static int do_hardware_modes(const struct ctl_table *table, int write,
198 void *result, size_t *lenp, loff_t *ppos)
199 {
200 struct parport *port = (struct parport *)table->extra1;
201 char buffer[40];
202 int len = 0;
203
204 if (*ppos) {
205 *lenp = 0;
206 return 0;
207 }
208
209 if (write) /* permissions prevent this anyway */
210 return -EACCES;
211
212 {
213 #define printmode(x) \
214 do { \
215 if (port->modes & PARPORT_MODE_##x) \
216 len += scnprintf(buffer + len, sizeof(buffer) - len, "%s%s", f++ ? "," : "", #x); \
217 } while (0)
218 int f = 0;
219 printmode(PCSPP);
220 printmode(TRISTATE);
221 printmode(COMPAT);
222 printmode(EPP);
223 printmode(ECP);
224 printmode(DMA);
225 #undef printmode
226 }
227 buffer[len++] = '\n';
228
229 if (len > *lenp)
230 len = *lenp;
231 else
232 *lenp = len;
233
234 *ppos += len;
235 memcpy(result, buffer, len);
236 return 0;
237 }
238
239 static const unsigned long parport_min_timeslice_value =
240 PARPORT_MIN_TIMESLICE_VALUE;
241
242 static const unsigned long parport_max_timeslice_value =
243 PARPORT_MAX_TIMESLICE_VALUE;
244
245 static const int parport_min_spintime_value =
246 PARPORT_MIN_SPINTIME_VALUE;
247
248 static const int parport_max_spintime_value =
249 PARPORT_MAX_SPINTIME_VALUE;
250
251
252 struct parport_sysctl_table {
253 struct ctl_table_header *port_header;
254 struct ctl_table_header *devices_header;
255 #ifdef CONFIG_PARPORT_1284
256 struct ctl_table vars[10];
257 #else
258 struct ctl_table vars[5];
259 #endif /* IEEE 1284 support */
260 struct ctl_table device_dir[1];
261 };
262
263 static const struct parport_sysctl_table parport_sysctl_template = {
264 .port_header = NULL,
265 .devices_header = NULL,
266 {
267 {
268 .procname = "spintime",
269 .data = NULL,
270 .maxlen = sizeof(int),
271 .mode = 0644,
272 .proc_handler = proc_dointvec_minmax,
273 .extra1 = (void*) &parport_min_spintime_value,
274 .extra2 = (void*) &parport_max_spintime_value
275 },
276 {
277 .procname = "base-addr",
278 .data = NULL,
279 .maxlen = 0,
280 .mode = 0444,
281 .proc_handler = do_hardware_base_addr
282 },
283 {
284 .procname = "irq",
285 .data = NULL,
286 .maxlen = 0,
287 .mode = 0444,
288 .proc_handler = do_hardware_irq
289 },
290 {
291 .procname = "dma",
292 .data = NULL,
293 .maxlen = 0,
294 .mode = 0444,
295 .proc_handler = do_hardware_dma
296 },
297 {
298 .procname = "modes",
299 .data = NULL,
300 .maxlen = 0,
301 .mode = 0444,
302 .proc_handler = do_hardware_modes
303 },
304 #ifdef CONFIG_PARPORT_1284
305 {
306 .procname = "autoprobe",
307 .data = NULL,
308 .maxlen = 0,
309 .mode = 0444,
310 .proc_handler = do_autoprobe
311 },
312 {
313 .procname = "autoprobe0",
314 .data = NULL,
315 .maxlen = 0,
316 .mode = 0444,
317 .proc_handler = do_autoprobe
318 },
319 {
320 .procname = "autoprobe1",
321 .data = NULL,
322 .maxlen = 0,
323 .mode = 0444,
324 .proc_handler = do_autoprobe
325 },
326 {
327 .procname = "autoprobe2",
328 .data = NULL,
329 .maxlen = 0,
330 .mode = 0444,
331 .proc_handler = do_autoprobe
332 },
333 {
334 .procname = "autoprobe3",
335 .data = NULL,
336 .maxlen = 0,
337 .mode = 0444,
338 .proc_handler = do_autoprobe
339 },
340 #endif /* IEEE 1284 support */
341 },
342 {
343 {
344 .procname = "active",
345 .data = NULL,
346 .maxlen = 0,
347 .mode = 0444,
348 .proc_handler = do_active_device
349 },
350 },
351 };
352
353 struct parport_device_sysctl_table
354 {
355 struct ctl_table_header *sysctl_header;
356 struct ctl_table vars[1];
357 struct ctl_table device_dir[1];
358 };
359
360 static const struct parport_device_sysctl_table
361 parport_device_sysctl_template = {
362 .sysctl_header = NULL,
363 {
364 {
365 .procname = "timeslice",
366 .data = NULL,
367 .maxlen = sizeof(unsigned long),
368 .mode = 0644,
369 .proc_handler = proc_doulongvec_ms_jiffies_minmax,
370 .extra1 = (void*) &parport_min_timeslice_value,
371 .extra2 = (void*) &parport_max_timeslice_value
372 },
373 },
374 {
375 {
376 .procname = NULL,
377 .data = NULL,
378 .maxlen = 0,
379 .mode = 0555,
380 },
381 }
382 };
383
384 struct parport_default_sysctl_table
385 {
386 struct ctl_table_header *sysctl_header;
387 struct ctl_table vars[2];
388 };
389
390 static struct parport_default_sysctl_table
391 parport_default_sysctl_table = {
392 .sysctl_header = NULL,
393 {
394 {
395 .procname = "timeslice",
396 .data = &parport_default_timeslice,
397 .maxlen = sizeof(parport_default_timeslice),
398 .mode = 0644,
399 .proc_handler = proc_doulongvec_ms_jiffies_minmax,
400 .extra1 = (void*) &parport_min_timeslice_value,
401 .extra2 = (void*) &parport_max_timeslice_value
402 },
403 {
404 .procname = "spintime",
405 .data = &parport_default_spintime,
406 .maxlen = sizeof(parport_default_spintime),
407 .mode = 0644,
408 .proc_handler = proc_dointvec_minmax,
409 .extra1 = (void*) &parport_min_spintime_value,
410 .extra2 = (void*) &parport_max_spintime_value
411 },
412 }
413 };
414
415 int parport_proc_register(struct parport *port)
416 {
417 struct parport_sysctl_table *t;
418 char *tmp_dir_path;
419 int i, err = 0;
420
421 t = kmemdup(&parport_sysctl_template, sizeof(*t), GFP_KERNEL);
422 if (t == NULL)
423 return -ENOMEM;
424
425 t->device_dir[0].extra1 = port;
426
427 t->vars[0].data = &port->spintime;
428 for (i = 0; i < 5; i++) {
429 t->vars[i].extra1 = port;
430 #ifdef CONFIG_PARPORT_1284
431 t->vars[5 + i].extra2 = &port->probe_info[i];
432 #endif /* IEEE 1284 support */
433 }
434
435 tmp_dir_path = kasprintf(GFP_KERNEL, "dev/parport/%s/devices", port->name);
436 if (!tmp_dir_path) {
437 err = -ENOMEM;
438 goto exit_free_t;
439 }
440
441 t->devices_header = register_sysctl(tmp_dir_path, t->device_dir);
442 if (t->devices_header == NULL) {
443 err = -ENOENT;
444 goto exit_free_tmp_dir_path;
445 }
446
447 kfree(tmp_dir_path);
448
449 tmp_dir_path = kasprintf(GFP_KERNEL, "dev/parport/%s", port->name);
450 if (!tmp_dir_path) {
451 err = -ENOMEM;
452 goto unregister_devices_h;
453 }
454
455 t->port_header = register_sysctl(tmp_dir_path, t->vars);
456 if (t->port_header == NULL) {
457 err = -ENOENT;
458 goto unregister_devices_h;
459 }
460
461 port->sysctl_table = t;
462
463 kfree(tmp_dir_path);
464 return 0;
465
466 unregister_devices_h:
467 unregister_sysctl_table(t->devices_header);
468
469 exit_free_tmp_dir_path:
470 kfree(tmp_dir_path);
471
472 exit_free_t:
473 kfree(t);
474 return err;
475 }
476
477 int parport_proc_unregister(struct parport *port)
478 {
479 if (port->sysctl_table) {
480 struct parport_sysctl_table *t = port->sysctl_table;
481 port->sysctl_table = NULL;
482 unregister_sysctl_table(t->devices_header);
483 unregister_sysctl_table(t->port_header);
484 kfree(t);
485 }
486 return 0;
487 }
488
489 int parport_device_proc_register(struct pardevice *device)
490 {
491 struct parport_device_sysctl_table *t;
492 struct parport * port = device->port;
493 char *tmp_dir_path;
494 int err = 0;
495
496 t = kmemdup(&parport_device_sysctl_template, sizeof(*t), GFP_KERNEL);
497 if (t == NULL)
498 return -ENOMEM;
499
500 /* Allocate a buffer for two paths: dev/parport/PORT/devices/DEVICE. */
501 tmp_dir_path = kasprintf(GFP_KERNEL, "dev/parport/%s/devices/%s", port->name, device->name);
502 if (!tmp_dir_path) {
503 err = -ENOMEM;
504 goto exit_free_t;
505 }
506
507 t->vars[0].data = &device->timeslice;
508
509 t->sysctl_header = register_sysctl(tmp_dir_path, t->vars);
510 if (t->sysctl_header == NULL) {
511 kfree(t);
512 t = NULL;
513 }
514 device->sysctl_table = t;
515
516 kfree(tmp_dir_path);
517 return 0;
518
519 exit_free_t:
520 kfree(t);
521
522 return err;
523 }
524
525 int parport_device_proc_unregister(struct pardevice *device)
526 {
527 if (device->sysctl_table) {
528 struct parport_device_sysctl_table *t = device->sysctl_table;
529 device->sysctl_table = NULL;
530 unregister_sysctl_table(t->sysctl_header);
531 kfree(t);
532 }
533 return 0;
534 }
535
536 static int __init parport_default_proc_register(void)
537 {
538 int ret;
539
540 parport_default_sysctl_table.sysctl_header =
541 register_sysctl("dev/parport/default", parport_default_sysctl_table.vars);
542 if (!parport_default_sysctl_table.sysctl_header)
543 return -ENOMEM;
544 ret = parport_bus_init();
545 if (ret) {
546 unregister_sysctl_table(parport_default_sysctl_table.
547 sysctl_header);
548 return ret;
549 }
550 return 0;
551 }
552
553 static void __exit parport_default_proc_unregister(void)
554 {
555 if (parport_default_sysctl_table.sysctl_header) {
556 unregister_sysctl_table(parport_default_sysctl_table.
557 sysctl_header);
558 parport_default_sysctl_table.sysctl_header = NULL;
559 }
560 parport_bus_exit();
561 }
562
563 #else /* no sysctl or no procfs*/
564
565 int parport_proc_register(struct parport *pp)
566 {
567 return 0;
568 }
569
570 int parport_proc_unregister(struct parport *pp)
571 {
572 return 0;
573 }
574
575 int parport_device_proc_register(struct pardevice *device)
576 {
577 return 0;
578 }
579
580 int parport_device_proc_unregister(struct pardevice *device)
581 {
582 return 0;
583 }
584
585 static int __init parport_default_proc_register (void)
586 {
587 return parport_bus_init();
588 }
589
590 static void __exit parport_default_proc_unregister (void)
591 {
592 parport_bus_exit();
593 }
594 #endif
595
596 subsys_initcall(parport_default_proc_register)
597 module_exit(parport_default_proc_unregister)
Kernel DRM miscellaneous fixes and cross-tree changes