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 *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(buf: buffer, fmt: "%s\n" , dev->name); |
55 | } |
56 | } |
57 | |
58 | if(!len) { |
59 | len += sprintf(buf: buffer, fmt: "%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(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 += sprintf (buf: buffer + len, fmt: "CLASS:%s;\n" , str); |
91 | |
92 | if ((str = info->model) != NULL) |
93 | len += sprintf (buf: buffer + len, fmt: "MODEL:%s;\n" , str); |
94 | |
95 | if ((str = info->mfr) != NULL) |
96 | len += sprintf (buf: buffer + len, fmt: "MANUFACTURER:%s;\n" , str); |
97 | |
98 | if ((str = info->description) != NULL) |
99 | len += sprintf (buf: buffer + len, fmt: "DESCRIPTION:%s;\n" , str); |
100 | |
101 | if ((str = info->cmdset) != NULL) |
102 | len += sprintf (buf: buffer + len, fmt: "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(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[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 (buf: buffer, fmt: "%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(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 += sprintf (buf: buffer, fmt: "%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(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 += sprintf (buf: buffer, fmt: "%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(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 += sprintf(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 *; |
254 | struct ctl_table_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 *; |
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 *; |
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(p: &parport_sysctl_template, size: 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, fmt: "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(objp: tmp_dir_path); |
448 | |
449 | tmp_dir_path = kasprintf(GFP_KERNEL, fmt: "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(objp: tmp_dir_path); |
464 | return 0; |
465 | |
466 | unregister_devices_h: |
467 | unregister_sysctl_table(table: t->devices_header); |
468 | |
469 | exit_free_tmp_dir_path: |
470 | kfree(objp: tmp_dir_path); |
471 | |
472 | exit_free_t: |
473 | kfree(objp: 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(table: t->devices_header); |
483 | unregister_sysctl_table(table: t->port_header); |
484 | kfree(objp: 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(p: &parport_device_sysctl_template, size: 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, fmt: "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(objp: t); |
512 | t = NULL; |
513 | } |
514 | device->sysctl_table = t; |
515 | |
516 | kfree(objp: tmp_dir_path); |
517 | return 0; |
518 | |
519 | exit_free_t: |
520 | kfree(objp: 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(table: t->sysctl_header); |
531 | kfree(objp: 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(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(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) |
598 | |