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1 | /* Helpers for initial module or kernel cmdline parsing |
2 | Copyright (C) 2001 Rusty Russell. |
3 | |
4 | This program is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
8 | |
9 | This program is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | GNU General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU General Public License |
15 | along with this program; if not, write to the Free Software |
16 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | */ |
18 | #include <linux/moduleparam.h> |
19 | #include <linux/kernel.h> |
20 | #include <linux/string.h> |
21 | #include <linux/errno.h> |
22 | #include <linux/module.h> |
23 | #include <linux/device.h> |
24 | #include <linux/err.h> |
25 | #include <linux/slab.h> |
26 | #include <linux/ctype.h> |
27 | |
28 | #if 0 |
29 | #define DEBUGP printk |
30 | #else |
31 | #define DEBUGP(fmt, a...) |
32 | #endif |
33 | |
34 | static inline char dash2underscore(char c) |
35 | { |
36 | if (c == '-') |
37 | return '_'; |
38 | return c; |
39 | } |
40 | |
41 | static inline int parameq(const char *input, const char *paramname) |
42 | { |
43 | unsigned int i; |
44 | for (i = 0; dash2underscore(input[i]) == paramname[i]; i++) |
45 | if (input[i] == '\0') |
46 | return 1; |
47 | return 0; |
48 | } |
49 | |
50 | static int parse_one(char *param, |
51 | char *val, |
52 | struct kernel_param *params, |
53 | unsigned num_params, |
54 | int (*handle_unknown)(char *param, char *val)) |
55 | { |
56 | unsigned int i; |
57 | |
58 | /* Find parameter */ |
59 | for (i = 0; i < num_params; i++) { |
60 | if (parameq(param, params[i].name)) { |
61 | DEBUGP("They are equal! Calling %p\n", |
62 | params[i].set); |
63 | return params[i].set(val, ¶ms[i]); |
64 | } |
65 | } |
66 | |
67 | if (handle_unknown) { |
68 | DEBUGP("Unknown argument: calling %p\n", handle_unknown); |
69 | return handle_unknown(param, val); |
70 | } |
71 | |
72 | DEBUGP("Unknown argument `%s'\n", param); |
73 | return -ENOENT; |
74 | } |
75 | |
76 | /* You can use " around spaces, but can't escape ". */ |
77 | /* Hyphens and underscores equivalent in parameter names. */ |
78 | static char *next_arg(char *args, char **param, char **val) |
79 | { |
80 | unsigned int i, equals = 0; |
81 | int in_quote = 0, quoted = 0; |
82 | char *next; |
83 | |
84 | if (*args == '"') { |
85 | args++; |
86 | in_quote = 1; |
87 | quoted = 1; |
88 | } |
89 | |
90 | for (i = 0; args[i]; i++) { |
91 | if (isspace(args[i]) && !in_quote) |
92 | break; |
93 | if (equals == 0) { |
94 | if (args[i] == '=') |
95 | equals = i; |
96 | } |
97 | if (args[i] == '"') |
98 | in_quote = !in_quote; |
99 | } |
100 | |
101 | *param = args; |
102 | if (!equals) |
103 | *val = NULL; |
104 | else { |
105 | args[equals] = '\0'; |
106 | *val = args + equals + 1; |
107 | |
108 | /* Don't include quotes in value. */ |
109 | if (**val == '"') { |
110 | (*val)++; |
111 | if (args[i-1] == '"') |
112 | args[i-1] = '\0'; |
113 | } |
114 | if (quoted && args[i-1] == '"') |
115 | args[i-1] = '\0'; |
116 | } |
117 | |
118 | if (args[i]) { |
119 | args[i] = '\0'; |
120 | next = args + i + 1; |
121 | } else |
122 | next = args + i; |
123 | |
124 | /* Chew up trailing spaces. */ |
125 | while (isspace(*next)) |
126 | next++; |
127 | return next; |
128 | } |
129 | |
130 | /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ |
131 | int parse_args(const char *name, |
132 | char *args, |
133 | struct kernel_param *params, |
134 | unsigned num, |
135 | int (*unknown)(char *param, char *val)) |
136 | { |
137 | char *param, *val; |
138 | |
139 | DEBUGP("Parsing ARGS: %s\n", args); |
140 | |
141 | /* Chew leading spaces */ |
142 | while (isspace(*args)) |
143 | args++; |
144 | |
145 | while (*args) { |
146 | int ret; |
147 | int irq_was_disabled; |
148 | |
149 | args = next_arg(args, ¶m, &val); |
150 | irq_was_disabled = irqs_disabled(); |
151 | ret = parse_one(param, val, params, num, unknown); |
152 | if (irq_was_disabled && !irqs_disabled()) { |
153 | printk(KERN_WARNING "parse_args(): option '%s' enabled " |
154 | "irq's!\n", param); |
155 | } |
156 | switch (ret) { |
157 | case -ENOENT: |
158 | printk(KERN_ERR "%s: Unknown parameter `%s'\n", |
159 | name, param); |
160 | return ret; |
161 | case -ENOSPC: |
162 | printk(KERN_ERR |
163 | "%s: `%s' too large for parameter `%s'\n", |
164 | name, val ?: "", param); |
165 | return ret; |
166 | case 0: |
167 | break; |
168 | default: |
169 | printk(KERN_ERR |
170 | "%s: `%s' invalid for parameter `%s'\n", |
171 | name, val ?: "", param); |
172 | return ret; |
173 | } |
174 | } |
175 | |
176 | /* All parsed OK. */ |
177 | return 0; |
178 | } |
179 | |
180 | /* Lazy bastard, eh? */ |
181 | #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \ |
182 | int param_set_##name(const char *val, struct kernel_param *kp) \ |
183 | { \ |
184 | tmptype l; \ |
185 | int ret; \ |
186 | \ |
187 | if (!val) return -EINVAL; \ |
188 | ret = strtolfn(val, 0, &l); \ |
189 | if (ret == -EINVAL || ((type)l != l)) \ |
190 | return -EINVAL; \ |
191 | *((type *)kp->arg) = l; \ |
192 | return 0; \ |
193 | } \ |
194 | int param_get_##name(char *buffer, struct kernel_param *kp) \ |
195 | { \ |
196 | return sprintf(buffer, format, *((type *)kp->arg)); \ |
197 | } |
198 | |
199 | STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul); |
200 | STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol); |
201 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul); |
202 | STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol); |
203 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul); |
204 | STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol); |
205 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul); |
206 | |
207 | int param_set_charp(const char *val, struct kernel_param *kp) |
208 | { |
209 | if (!val) { |
210 | printk(KERN_ERR "%s: string parameter expected\n", |
211 | kp->name); |
212 | return -EINVAL; |
213 | } |
214 | |
215 | if (strlen(val) > 1024) { |
216 | printk(KERN_ERR "%s: string parameter too long\n", |
217 | kp->name); |
218 | return -ENOSPC; |
219 | } |
220 | |
221 | /* This is a hack. We can't need to strdup in early boot, and we |
222 | * don't need to; this mangled commandline is preserved. */ |
223 | if (slab_is_available()) { |
224 | *(char **)kp->arg = kstrdup(val, GFP_KERNEL); |
225 | if (!*(char **)kp->arg) |
226 | return -ENOMEM; |
227 | } else |
228 | *(const char **)kp->arg = val; |
229 | |
230 | return 0; |
231 | } |
232 | |
233 | int param_get_charp(char *buffer, struct kernel_param *kp) |
234 | { |
235 | return sprintf(buffer, "%s", *((char **)kp->arg)); |
236 | } |
237 | |
238 | /* Actually could be a bool or an int, for historical reasons. */ |
239 | int param_set_bool(const char *val, struct kernel_param *kp) |
240 | { |
241 | bool v; |
242 | |
243 | /* No equals means "set"... */ |
244 | if (!val) val = "1"; |
245 | |
246 | /* One of =[yYnN01] */ |
247 | switch (val[0]) { |
248 | case 'y': case 'Y': case '1': |
249 | v = true; |
250 | break; |
251 | case 'n': case 'N': case '0': |
252 | v = false; |
253 | break; |
254 | default: |
255 | return -EINVAL; |
256 | } |
257 | |
258 | if (kp->flags & KPARAM_ISBOOL) |
259 | *(bool *)kp->arg = v; |
260 | else |
261 | *(int *)kp->arg = v; |
262 | return 0; |
263 | } |
264 | |
265 | int param_get_bool(char *buffer, struct kernel_param *kp) |
266 | { |
267 | bool val; |
268 | if (kp->flags & KPARAM_ISBOOL) |
269 | val = *(bool *)kp->arg; |
270 | else |
271 | val = *(int *)kp->arg; |
272 | |
273 | /* Y and N chosen as being relatively non-coder friendly */ |
274 | return sprintf(buffer, "%c", val ? 'Y' : 'N'); |
275 | } |
276 | |
277 | /* This one must be bool. */ |
278 | int param_set_invbool(const char *val, struct kernel_param *kp) |
279 | { |
280 | int ret; |
281 | bool boolval; |
282 | struct kernel_param dummy; |
283 | |
284 | dummy.arg = &boolval; |
285 | dummy.flags = KPARAM_ISBOOL; |
286 | ret = param_set_bool(val, &dummy); |
287 | if (ret == 0) |
288 | *(bool *)kp->arg = !boolval; |
289 | return ret; |
290 | } |
291 | |
292 | int param_get_invbool(char *buffer, struct kernel_param *kp) |
293 | { |
294 | return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y'); |
295 | } |
296 | |
297 | /* We break the rule and mangle the string. */ |
298 | static int param_array(const char *name, |
299 | const char *val, |
300 | unsigned int min, unsigned int max, |
301 | void *elem, int elemsize, |
302 | int (*set)(const char *, struct kernel_param *kp), |
303 | u16 flags, |
304 | unsigned int *num) |
305 | { |
306 | int ret; |
307 | struct kernel_param kp; |
308 | char save; |
309 | |
310 | /* Get the name right for errors. */ |
311 | kp.name = name; |
312 | kp.arg = elem; |
313 | kp.flags = flags; |
314 | |
315 | /* No equals sign? */ |
316 | if (!val) { |
317 | printk(KERN_ERR "%s: expects arguments\n", name); |
318 | return -EINVAL; |
319 | } |
320 | |
321 | *num = 0; |
322 | /* We expect a comma-separated list of values. */ |
323 | do { |
324 | int len; |
325 | |
326 | if (*num == max) { |
327 | printk(KERN_ERR "%s: can only take %i arguments\n", |
328 | name, max); |
329 | return -EINVAL; |
330 | } |
331 | len = strcspn(val, ","); |
332 | |
333 | /* nul-terminate and parse */ |
334 | save = val[len]; |
335 | ((char *)val)[len] = '\0'; |
336 | ret = set(val, &kp); |
337 | |
338 | if (ret != 0) |
339 | return ret; |
340 | kp.arg += elemsize; |
341 | val += len+1; |
342 | (*num)++; |
343 | } while (save == ','); |
344 | |
345 | if (*num < min) { |
346 | printk(KERN_ERR "%s: needs at least %i arguments\n", |
347 | name, min); |
348 | return -EINVAL; |
349 | } |
350 | return 0; |
351 | } |
352 | |
353 | int param_array_set(const char *val, struct kernel_param *kp) |
354 | { |
355 | const struct kparam_array *arr = kp->arr; |
356 | unsigned int temp_num; |
357 | |
358 | return param_array(kp->name, val, 1, arr->max, arr->elem, |
359 | arr->elemsize, arr->set, kp->flags, |
360 | arr->num ?: &temp_num); |
361 | } |
362 | |
363 | int param_array_get(char *buffer, struct kernel_param *kp) |
364 | { |
365 | int i, off, ret; |
366 | const struct kparam_array *arr = kp->arr; |
367 | struct kernel_param p; |
368 | |
369 | p = *kp; |
370 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { |
371 | if (i) |
372 | buffer[off++] = ','; |
373 | p.arg = arr->elem + arr->elemsize * i; |
374 | ret = arr->get(buffer + off, &p); |
375 | if (ret < 0) |
376 | return ret; |
377 | off += ret; |
378 | } |
379 | buffer[off] = '\0'; |
380 | return off; |
381 | } |
382 | |
383 | int param_set_copystring(const char *val, struct kernel_param *kp) |
384 | { |
385 | const struct kparam_string *kps = kp->str; |
386 | |
387 | if (!val) { |
388 | printk(KERN_ERR "%s: missing param set value\n", kp->name); |
389 | return -EINVAL; |
390 | } |
391 | if (strlen(val)+1 > kps->maxlen) { |
392 | printk(KERN_ERR "%s: string doesn't fit in %u chars.\n", |
393 | kp->name, kps->maxlen-1); |
394 | return -ENOSPC; |
395 | } |
396 | strcpy(kps->string, val); |
397 | return 0; |
398 | } |
399 | |
400 | int param_get_string(char *buffer, struct kernel_param *kp) |
401 | { |
402 | const struct kparam_string *kps = kp->str; |
403 | return strlcpy(buffer, kps->string, kps->maxlen); |
404 | } |
405 | |
406 | /* sysfs output in /sys/modules/XYZ/parameters/ */ |
407 | #define to_module_attr(n) container_of(n, struct module_attribute, attr); |
408 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj); |
409 | |
410 | extern struct kernel_param __start___param[], __stop___param[]; |
411 | |
412 | struct param_attribute |
413 | { |
414 | struct module_attribute mattr; |
415 | struct kernel_param *param; |
416 | }; |
417 | |
418 | struct module_param_attrs |
419 | { |
420 | unsigned int num; |
421 | struct attribute_group grp; |
422 | struct param_attribute attrs[0]; |
423 | }; |
424 | |
425 | #ifdef CONFIG_SYSFS |
426 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr); |
427 | |
428 | static ssize_t param_attr_show(struct module_attribute *mattr, |
429 | struct module *mod, char *buf) |
430 | { |
431 | int count; |
432 | struct param_attribute *attribute = to_param_attr(mattr); |
433 | |
434 | if (!attribute->param->get) |
435 | return -EPERM; |
436 | |
437 | count = attribute->param->get(buf, attribute->param); |
438 | if (count > 0) { |
439 | strcat(buf, "\n"); |
440 | ++count; |
441 | } |
442 | return count; |
443 | } |
444 | |
445 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ |
446 | static ssize_t param_attr_store(struct module_attribute *mattr, |
447 | struct module *owner, |
448 | const char *buf, size_t len) |
449 | { |
450 | int err; |
451 | struct param_attribute *attribute = to_param_attr(mattr); |
452 | |
453 | if (!attribute->param->set) |
454 | return -EPERM; |
455 | |
456 | err = attribute->param->set(buf, attribute->param); |
457 | if (!err) |
458 | return len; |
459 | return err; |
460 | } |
461 | #endif |
462 | |
463 | #ifdef CONFIG_MODULES |
464 | #define __modinit |
465 | #else |
466 | #define __modinit __init |
467 | #endif |
468 | |
469 | #ifdef CONFIG_SYSFS |
470 | /* |
471 | * add_sysfs_param - add a parameter to sysfs |
472 | * @mk: struct module_kobject |
473 | * @kparam: the actual parameter definition to add to sysfs |
474 | * @name: name of parameter |
475 | * |
476 | * Create a kobject if for a (per-module) parameter if mp NULL, and |
477 | * create file in sysfs. Returns an error on out of memory. Always cleans up |
478 | * if there's an error. |
479 | */ |
480 | static __modinit int add_sysfs_param(struct module_kobject *mk, |
481 | struct kernel_param *kp, |
482 | const char *name) |
483 | { |
484 | struct module_param_attrs *new; |
485 | struct attribute **attrs; |
486 | int err, num; |
487 | |
488 | /* We don't bother calling this with invisible parameters. */ |
489 | BUG_ON(!kp->perm); |
490 | |
491 | if (!mk->mp) { |
492 | num = 0; |
493 | attrs = NULL; |
494 | } else { |
495 | num = mk->mp->num; |
496 | attrs = mk->mp->grp.attrs; |
497 | } |
498 | |
499 | /* Enlarge. */ |
500 | new = krealloc(mk->mp, |
501 | sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1), |
502 | GFP_KERNEL); |
503 | if (!new) { |
504 | kfree(mk->mp); |
505 | err = -ENOMEM; |
506 | goto fail; |
507 | } |
508 | attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL); |
509 | if (!attrs) { |
510 | err = -ENOMEM; |
511 | goto fail_free_new; |
512 | } |
513 | |
514 | /* Sysfs wants everything zeroed. */ |
515 | memset(new, 0, sizeof(*new)); |
516 | memset(&new->attrs[num], 0, sizeof(new->attrs[num])); |
517 | memset(&attrs[num], 0, sizeof(attrs[num])); |
518 | new->grp.name = "parameters"; |
519 | new->grp.attrs = attrs; |
520 | |
521 | /* Tack new one on the end. */ |
522 | new->attrs[num].param = kp; |
523 | new->attrs[num].mattr.show = param_attr_show; |
524 | new->attrs[num].mattr.store = param_attr_store; |
525 | new->attrs[num].mattr.attr.name = (char *)name; |
526 | new->attrs[num].mattr.attr.mode = kp->perm; |
527 | new->num = num+1; |
528 | |
529 | /* Fix up all the pointers, since krealloc can move us */ |
530 | for (num = 0; num < new->num; num++) |
531 | new->grp.attrs[num] = &new->attrs[num].mattr.attr; |
532 | new->grp.attrs[num] = NULL; |
533 | |
534 | mk->mp = new; |
535 | return 0; |
536 | |
537 | fail_free_new: |
538 | kfree(new); |
539 | fail: |
540 | mk->mp = NULL; |
541 | return err; |
542 | } |
543 | |
544 | #ifdef CONFIG_MODULES |
545 | static void free_module_param_attrs(struct module_kobject *mk) |
546 | { |
547 | kfree(mk->mp->grp.attrs); |
548 | kfree(mk->mp); |
549 | mk->mp = NULL; |
550 | } |
551 | |
552 | /* |
553 | * module_param_sysfs_setup - setup sysfs support for one module |
554 | * @mod: module |
555 | * @kparam: module parameters (array) |
556 | * @num_params: number of module parameters |
557 | * |
558 | * Adds sysfs entries for module parameters under |
559 | * /sys/module/[mod->name]/parameters/ |
560 | */ |
561 | int module_param_sysfs_setup(struct module *mod, |
562 | struct kernel_param *kparam, |
563 | unsigned int num_params) |
564 | { |
565 | int i, err; |
566 | bool params = false; |
567 | |
568 | for (i = 0; i < num_params; i++) { |
569 | if (kparam[i].perm == 0) |
570 | continue; |
571 | err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); |
572 | if (err) |
573 | return err; |
574 | params = true; |
575 | } |
576 | |
577 | if (!params) |
578 | return 0; |
579 | |
580 | /* Create the param group. */ |
581 | err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
582 | if (err) |
583 | free_module_param_attrs(&mod->mkobj); |
584 | return err; |
585 | } |
586 | |
587 | /* |
588 | * module_param_sysfs_remove - remove sysfs support for one module |
589 | * @mod: module |
590 | * |
591 | * Remove sysfs entries for module parameters and the corresponding |
592 | * kobject. |
593 | */ |
594 | void module_param_sysfs_remove(struct module *mod) |
595 | { |
596 | if (mod->mkobj.mp) { |
597 | sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
598 | /* We are positive that no one is using any param |
599 | * attrs at this point. Deallocate immediately. */ |
600 | free_module_param_attrs(&mod->mkobj); |
601 | } |
602 | } |
603 | #endif |
604 | |
605 | void destroy_params(const struct kernel_param *params, unsigned num) |
606 | { |
607 | /* FIXME: This should free kmalloced charp parameters. It doesn't. */ |
608 | } |
609 | |
610 | static void __init kernel_add_sysfs_param(const char *name, |
611 | struct kernel_param *kparam, |
612 | unsigned int name_skip) |
613 | { |
614 | struct module_kobject *mk; |
615 | struct kobject *kobj; |
616 | int err; |
617 | |
618 | kobj = kset_find_obj(module_kset, name); |
619 | if (kobj) { |
620 | /* We already have one. Remove params so we can add more. */ |
621 | mk = to_module_kobject(kobj); |
622 | /* We need to remove it before adding parameters. */ |
623 | sysfs_remove_group(&mk->kobj, &mk->mp->grp); |
624 | } else { |
625 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); |
626 | BUG_ON(!mk); |
627 | |
628 | mk->mod = THIS_MODULE; |
629 | mk->kobj.kset = module_kset; |
630 | err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, |
631 | "%s", name); |
632 | if (err) { |
633 | kobject_put(&mk->kobj); |
634 | printk(KERN_ERR "Module '%s' failed add to sysfs, " |
635 | "error number %d\n", name, err); |
636 | printk(KERN_ERR "The system will be unstable now.\n"); |
637 | return; |
638 | } |
639 | /* So that exit path is even. */ |
640 | kobject_get(&mk->kobj); |
641 | } |
642 | |
643 | /* These should not fail at boot. */ |
644 | err = add_sysfs_param(mk, kparam, kparam->name + name_skip); |
645 | BUG_ON(err); |
646 | err = sysfs_create_group(&mk->kobj, &mk->mp->grp); |
647 | BUG_ON(err); |
648 | kobject_uevent(&mk->kobj, KOBJ_ADD); |
649 | kobject_put(&mk->kobj); |
650 | } |
651 | |
652 | /* |
653 | * param_sysfs_builtin - add contents in /sys/parameters for built-in modules |
654 | * |
655 | * Add module_parameters to sysfs for "modules" built into the kernel. |
656 | * |
657 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the |
658 | * "parameter" name is stored behind a dot in kernel_param->name. So, |
659 | * extract the "module" name for all built-in kernel_param-eters, |
660 | * and for all who have the same, call kernel_add_sysfs_param. |
661 | */ |
662 | static void __init param_sysfs_builtin(void) |
663 | { |
664 | struct kernel_param *kp; |
665 | unsigned int name_len; |
666 | char modname[MODULE_NAME_LEN]; |
667 | |
668 | for (kp = __start___param; kp < __stop___param; kp++) { |
669 | char *dot; |
670 | |
671 | if (kp->perm == 0) |
672 | continue; |
673 | |
674 | dot = strchr(kp->name, '.'); |
675 | if (!dot) { |
676 | /* This happens for core_param() */ |
677 | strcpy(modname, "kernel"); |
678 | name_len = 0; |
679 | } else { |
680 | name_len = dot - kp->name + 1; |
681 | strlcpy(modname, kp->name, name_len); |
682 | } |
683 | kernel_add_sysfs_param(modname, kp, name_len); |
684 | } |
685 | } |
686 | |
687 | |
688 | /* module-related sysfs stuff */ |
689 | |
690 | static ssize_t module_attr_show(struct kobject *kobj, |
691 | struct attribute *attr, |
692 | char *buf) |
693 | { |
694 | struct module_attribute *attribute; |
695 | struct module_kobject *mk; |
696 | int ret; |
697 | |
698 | attribute = to_module_attr(attr); |
699 | mk = to_module_kobject(kobj); |
700 | |
701 | if (!attribute->show) |
702 | return -EIO; |
703 | |
704 | ret = attribute->show(attribute, mk->mod, buf); |
705 | |
706 | return ret; |
707 | } |
708 | |
709 | static ssize_t module_attr_store(struct kobject *kobj, |
710 | struct attribute *attr, |
711 | const char *buf, size_t len) |
712 | { |
713 | struct module_attribute *attribute; |
714 | struct module_kobject *mk; |
715 | int ret; |
716 | |
717 | attribute = to_module_attr(attr); |
718 | mk = to_module_kobject(kobj); |
719 | |
720 | if (!attribute->store) |
721 | return -EIO; |
722 | |
723 | ret = attribute->store(attribute, mk->mod, buf, len); |
724 | |
725 | return ret; |
726 | } |
727 | |
728 | static struct sysfs_ops module_sysfs_ops = { |
729 | .show = module_attr_show, |
730 | .store = module_attr_store, |
731 | }; |
732 | |
733 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
734 | { |
735 | struct kobj_type *ktype = get_ktype(kobj); |
736 | |
737 | if (ktype == &module_ktype) |
738 | return 1; |
739 | return 0; |
740 | } |
741 | |
742 | static struct kset_uevent_ops module_uevent_ops = { |
743 | .filter = uevent_filter, |
744 | }; |
745 | |
746 | struct kset *module_kset; |
747 | int module_sysfs_initialized; |
748 | |
749 | struct kobj_type module_ktype = { |
750 | .sysfs_ops = &module_sysfs_ops, |
751 | }; |
752 | |
753 | /* |
754 | * param_sysfs_init - wrapper for built-in params support |
755 | */ |
756 | static int __init param_sysfs_init(void) |
757 | { |
758 | module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); |
759 | if (!module_kset) { |
760 | printk(KERN_WARNING "%s (%d): error creating kset\n", |
761 | __FILE__, __LINE__); |
762 | return -ENOMEM; |
763 | } |
764 | module_sysfs_initialized = 1; |
765 | |
766 | param_sysfs_builtin(); |
767 | |
768 | return 0; |
769 | } |
770 | subsys_initcall(param_sysfs_init); |
771 | |
772 | #endif /* CONFIG_SYSFS */ |
773 | |
774 | EXPORT_SYMBOL(param_set_byte); |
775 | EXPORT_SYMBOL(param_get_byte); |
776 | EXPORT_SYMBOL(param_set_short); |
777 | EXPORT_SYMBOL(param_get_short); |
778 | EXPORT_SYMBOL(param_set_ushort); |
779 | EXPORT_SYMBOL(param_get_ushort); |
780 | EXPORT_SYMBOL(param_set_int); |
781 | EXPORT_SYMBOL(param_get_int); |
782 | EXPORT_SYMBOL(param_set_uint); |
783 | EXPORT_SYMBOL(param_get_uint); |
784 | EXPORT_SYMBOL(param_set_long); |
785 | EXPORT_SYMBOL(param_get_long); |
786 | EXPORT_SYMBOL(param_set_ulong); |
787 | EXPORT_SYMBOL(param_get_ulong); |
788 | EXPORT_SYMBOL(param_set_charp); |
789 | EXPORT_SYMBOL(param_get_charp); |
790 | EXPORT_SYMBOL(param_set_bool); |
791 | EXPORT_SYMBOL(param_get_bool); |
792 | EXPORT_SYMBOL(param_set_invbool); |
793 | EXPORT_SYMBOL(param_get_invbool); |
794 | EXPORT_SYMBOL(param_array_set); |
795 | EXPORT_SYMBOL(param_array_get); |
796 | EXPORT_SYMBOL(param_set_copystring); |
797 | EXPORT_SYMBOL(param_get_string); |
798 |
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od-2011-09-18
v2.6.34-rc5
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