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1da177e4 LT |
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/config.h> | |
19 | #include <linux/moduleparam.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/device.h> | |
25 | #include <linux/err.h> | |
4e57b681 | 26 | #include <linux/slab.h> |
1da177e4 LT |
27 | |
28 | #if 0 | |
29 | #define DEBUGP printk | |
30 | #else | |
31 | #define DEBUGP(fmt, a...) | |
32 | #endif | |
33 | ||
34 | static inline int 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 | ||
1da177e4 LT |
84 | if (*args == '"') { |
85 | args++; | |
86 | in_quote = 1; | |
87 | quoted = 1; | |
88 | } | |
89 | ||
90 | for (i = 0; args[i]; i++) { | |
91 | if (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; | |
f36462f0 RR |
123 | |
124 | /* Chew up trailing spaces. */ | |
125 | while (*next == ' ') | |
126 | next++; | |
1da177e4 LT |
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 | ||
f36462f0 RR |
141 | /* Chew leading spaces */ |
142 | while (*args == ' ') | |
143 | args++; | |
144 | ||
1da177e4 LT |
145 | while (*args) { |
146 | int ret; | |
147 | ||
148 | args = next_arg(args, ¶m, &val); | |
149 | ret = parse_one(param, val, params, num, unknown); | |
150 | switch (ret) { | |
151 | case -ENOENT: | |
152 | printk(KERN_ERR "%s: Unknown parameter `%s'\n", | |
153 | name, param); | |
154 | return ret; | |
155 | case -ENOSPC: | |
156 | printk(KERN_ERR | |
157 | "%s: `%s' too large for parameter `%s'\n", | |
158 | name, val ?: "", param); | |
159 | return ret; | |
160 | case 0: | |
161 | break; | |
162 | default: | |
163 | printk(KERN_ERR | |
164 | "%s: `%s' invalid for parameter `%s'\n", | |
165 | name, val ?: "", param); | |
166 | return ret; | |
167 | } | |
168 | } | |
169 | ||
170 | /* All parsed OK. */ | |
171 | return 0; | |
172 | } | |
173 | ||
174 | /* Lazy bastard, eh? */ | |
175 | #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \ | |
176 | int param_set_##name(const char *val, struct kernel_param *kp) \ | |
177 | { \ | |
178 | char *endp; \ | |
179 | tmptype l; \ | |
180 | \ | |
181 | if (!val) return -EINVAL; \ | |
182 | l = strtolfn(val, &endp, 0); \ | |
183 | if (endp == val || ((type)l != l)) \ | |
184 | return -EINVAL; \ | |
185 | *((type *)kp->arg) = l; \ | |
186 | return 0; \ | |
187 | } \ | |
188 | int param_get_##name(char *buffer, struct kernel_param *kp) \ | |
189 | { \ | |
190 | return sprintf(buffer, format, *((type *)kp->arg)); \ | |
191 | } | |
192 | ||
193 | STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, simple_strtoul); | |
194 | STANDARD_PARAM_DEF(short, short, "%hi", long, simple_strtol); | |
195 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, simple_strtoul); | |
196 | STANDARD_PARAM_DEF(int, int, "%i", long, simple_strtol); | |
197 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, simple_strtoul); | |
198 | STANDARD_PARAM_DEF(long, long, "%li", long, simple_strtol); | |
199 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, simple_strtoul); | |
200 | ||
201 | int param_set_charp(const char *val, struct kernel_param *kp) | |
202 | { | |
203 | if (!val) { | |
204 | printk(KERN_ERR "%s: string parameter expected\n", | |
205 | kp->name); | |
206 | return -EINVAL; | |
207 | } | |
208 | ||
209 | if (strlen(val) > 1024) { | |
210 | printk(KERN_ERR "%s: string parameter too long\n", | |
211 | kp->name); | |
212 | return -ENOSPC; | |
213 | } | |
214 | ||
215 | *(char **)kp->arg = (char *)val; | |
216 | return 0; | |
217 | } | |
218 | ||
219 | int param_get_charp(char *buffer, struct kernel_param *kp) | |
220 | { | |
221 | return sprintf(buffer, "%s", *((char **)kp->arg)); | |
222 | } | |
223 | ||
224 | int param_set_bool(const char *val, struct kernel_param *kp) | |
225 | { | |
226 | /* No equals means "set"... */ | |
227 | if (!val) val = "1"; | |
228 | ||
229 | /* One of =[yYnN01] */ | |
230 | switch (val[0]) { | |
231 | case 'y': case 'Y': case '1': | |
232 | *(int *)kp->arg = 1; | |
233 | return 0; | |
234 | case 'n': case 'N': case '0': | |
235 | *(int *)kp->arg = 0; | |
236 | return 0; | |
237 | } | |
238 | return -EINVAL; | |
239 | } | |
240 | ||
241 | int param_get_bool(char *buffer, struct kernel_param *kp) | |
242 | { | |
243 | /* Y and N chosen as being relatively non-coder friendly */ | |
244 | return sprintf(buffer, "%c", (*(int *)kp->arg) ? 'Y' : 'N'); | |
245 | } | |
246 | ||
247 | int param_set_invbool(const char *val, struct kernel_param *kp) | |
248 | { | |
249 | int boolval, ret; | |
250 | struct kernel_param dummy = { .arg = &boolval }; | |
251 | ||
252 | ret = param_set_bool(val, &dummy); | |
253 | if (ret == 0) | |
254 | *(int *)kp->arg = !boolval; | |
255 | return ret; | |
256 | } | |
257 | ||
258 | int param_get_invbool(char *buffer, struct kernel_param *kp) | |
259 | { | |
260 | int val; | |
261 | struct kernel_param dummy = { .arg = &val }; | |
262 | ||
263 | val = !*(int *)kp->arg; | |
264 | return param_get_bool(buffer, &dummy); | |
265 | } | |
266 | ||
267 | /* We cheat here and temporarily mangle the string. */ | |
268 | int param_array(const char *name, | |
269 | const char *val, | |
270 | unsigned int min, unsigned int max, | |
271 | void *elem, int elemsize, | |
272 | int (*set)(const char *, struct kernel_param *kp), | |
273 | int *num) | |
274 | { | |
275 | int ret; | |
276 | struct kernel_param kp; | |
277 | char save; | |
278 | ||
279 | /* Get the name right for errors. */ | |
280 | kp.name = name; | |
281 | kp.arg = elem; | |
282 | ||
283 | /* No equals sign? */ | |
284 | if (!val) { | |
285 | printk(KERN_ERR "%s: expects arguments\n", name); | |
286 | return -EINVAL; | |
287 | } | |
288 | ||
289 | *num = 0; | |
290 | /* We expect a comma-separated list of values. */ | |
291 | do { | |
292 | int len; | |
293 | ||
294 | if (*num == max) { | |
295 | printk(KERN_ERR "%s: can only take %i arguments\n", | |
296 | name, max); | |
297 | return -EINVAL; | |
298 | } | |
299 | len = strcspn(val, ","); | |
300 | ||
301 | /* nul-terminate and parse */ | |
302 | save = val[len]; | |
303 | ((char *)val)[len] = '\0'; | |
304 | ret = set(val, &kp); | |
305 | ||
306 | if (ret != 0) | |
307 | return ret; | |
308 | kp.arg += elemsize; | |
309 | val += len+1; | |
310 | (*num)++; | |
311 | } while (save == ','); | |
312 | ||
313 | if (*num < min) { | |
314 | printk(KERN_ERR "%s: needs at least %i arguments\n", | |
315 | name, min); | |
316 | return -EINVAL; | |
317 | } | |
318 | return 0; | |
319 | } | |
320 | ||
321 | int param_array_set(const char *val, struct kernel_param *kp) | |
322 | { | |
323 | struct kparam_array *arr = kp->arg; | |
31143a12 | 324 | unsigned int temp_num; |
1da177e4 LT |
325 | |
326 | return param_array(kp->name, val, 1, arr->max, arr->elem, | |
31143a12 | 327 | arr->elemsize, arr->set, arr->num ?: &temp_num); |
1da177e4 LT |
328 | } |
329 | ||
330 | int param_array_get(char *buffer, struct kernel_param *kp) | |
331 | { | |
332 | int i, off, ret; | |
333 | struct kparam_array *arr = kp->arg; | |
334 | struct kernel_param p; | |
335 | ||
336 | p = *kp; | |
337 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { | |
338 | if (i) | |
339 | buffer[off++] = ','; | |
340 | p.arg = arr->elem + arr->elemsize * i; | |
341 | ret = arr->get(buffer + off, &p); | |
342 | if (ret < 0) | |
343 | return ret; | |
344 | off += ret; | |
345 | } | |
346 | buffer[off] = '\0'; | |
347 | return off; | |
348 | } | |
349 | ||
350 | int param_set_copystring(const char *val, struct kernel_param *kp) | |
351 | { | |
352 | struct kparam_string *kps = kp->arg; | |
353 | ||
354 | if (strlen(val)+1 > kps->maxlen) { | |
355 | printk(KERN_ERR "%s: string doesn't fit in %u chars.\n", | |
356 | kp->name, kps->maxlen-1); | |
357 | return -ENOSPC; | |
358 | } | |
359 | strcpy(kps->string, val); | |
360 | return 0; | |
361 | } | |
362 | ||
363 | int param_get_string(char *buffer, struct kernel_param *kp) | |
364 | { | |
365 | struct kparam_string *kps = kp->arg; | |
366 | return strlcpy(buffer, kps->string, kps->maxlen); | |
367 | } | |
368 | ||
369 | /* sysfs output in /sys/modules/XYZ/parameters/ */ | |
370 | ||
371 | extern struct kernel_param __start___param[], __stop___param[]; | |
372 | ||
373 | #define MAX_KBUILD_MODNAME KOBJ_NAME_LEN | |
374 | ||
375 | struct param_attribute | |
376 | { | |
377 | struct module_attribute mattr; | |
378 | struct kernel_param *param; | |
379 | }; | |
380 | ||
381 | struct module_param_attrs | |
382 | { | |
383 | struct attribute_group grp; | |
384 | struct param_attribute attrs[0]; | |
385 | }; | |
386 | ||
387 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr); | |
388 | ||
389 | static ssize_t param_attr_show(struct module_attribute *mattr, | |
390 | struct module *mod, char *buf) | |
391 | { | |
392 | int count; | |
393 | struct param_attribute *attribute = to_param_attr(mattr); | |
394 | ||
395 | if (!attribute->param->get) | |
396 | return -EPERM; | |
397 | ||
398 | count = attribute->param->get(buf, attribute->param); | |
399 | if (count > 0) { | |
400 | strcat(buf, "\n"); | |
401 | ++count; | |
402 | } | |
403 | return count; | |
404 | } | |
405 | ||
406 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ | |
407 | static ssize_t param_attr_store(struct module_attribute *mattr, | |
408 | struct module *owner, | |
409 | const char *buf, size_t len) | |
410 | { | |
411 | int err; | |
412 | struct param_attribute *attribute = to_param_attr(mattr); | |
413 | ||
414 | if (!attribute->param->set) | |
415 | return -EPERM; | |
416 | ||
417 | err = attribute->param->set(buf, attribute->param); | |
418 | if (!err) | |
419 | return len; | |
420 | return err; | |
421 | } | |
422 | ||
423 | #ifdef CONFIG_MODULES | |
424 | #define __modinit | |
425 | #else | |
426 | #define __modinit __init | |
427 | #endif | |
428 | ||
429 | /* | |
430 | * param_sysfs_setup - setup sysfs support for one module or KBUILD_MODNAME | |
431 | * @mk: struct module_kobject (contains parent kobject) | |
432 | * @kparam: array of struct kernel_param, the actual parameter definitions | |
433 | * @num_params: number of entries in array | |
434 | * @name_skip: offset where the parameter name start in kparam[].name. Needed for built-in "modules" | |
435 | * | |
436 | * Create a kobject for a (per-module) group of parameters, and create files | |
437 | * in sysfs. A pointer to the param_kobject is returned on success, | |
438 | * NULL if there's no parameter to export, or other ERR_PTR(err). | |
439 | */ | |
440 | static __modinit struct module_param_attrs * | |
441 | param_sysfs_setup(struct module_kobject *mk, | |
442 | struct kernel_param *kparam, | |
443 | unsigned int num_params, | |
444 | unsigned int name_skip) | |
445 | { | |
446 | struct module_param_attrs *mp; | |
447 | unsigned int valid_attrs = 0; | |
448 | unsigned int i, size[2]; | |
449 | struct param_attribute *pattr; | |
450 | struct attribute **gattr; | |
451 | int err; | |
452 | ||
453 | for (i=0; i<num_params; i++) { | |
454 | if (kparam[i].perm) | |
455 | valid_attrs++; | |
456 | } | |
457 | ||
458 | if (!valid_attrs) | |
459 | return NULL; | |
460 | ||
461 | size[0] = ALIGN(sizeof(*mp) + | |
462 | valid_attrs * sizeof(mp->attrs[0]), | |
463 | sizeof(mp->grp.attrs[0])); | |
464 | size[1] = (valid_attrs + 1) * sizeof(mp->grp.attrs[0]); | |
465 | ||
466 | mp = kmalloc(size[0] + size[1], GFP_KERNEL); | |
467 | if (!mp) | |
468 | return ERR_PTR(-ENOMEM); | |
469 | ||
470 | mp->grp.name = "parameters"; | |
471 | mp->grp.attrs = (void *)mp + size[0]; | |
472 | ||
473 | pattr = &mp->attrs[0]; | |
474 | gattr = &mp->grp.attrs[0]; | |
475 | for (i = 0; i < num_params; i++) { | |
476 | struct kernel_param *kp = &kparam[i]; | |
477 | if (kp->perm) { | |
478 | pattr->param = kp; | |
479 | pattr->mattr.show = param_attr_show; | |
480 | pattr->mattr.store = param_attr_store; | |
481 | pattr->mattr.attr.name = (char *)&kp->name[name_skip]; | |
482 | pattr->mattr.attr.owner = mk->mod; | |
483 | pattr->mattr.attr.mode = kp->perm; | |
484 | *(gattr++) = &(pattr++)->mattr.attr; | |
485 | } | |
486 | } | |
487 | *gattr = NULL; | |
488 | ||
489 | if ((err = sysfs_create_group(&mk->kobj, &mp->grp))) { | |
490 | kfree(mp); | |
491 | return ERR_PTR(err); | |
492 | } | |
493 | return mp; | |
494 | } | |
495 | ||
496 | ||
497 | #ifdef CONFIG_MODULES | |
498 | ||
499 | /* | |
500 | * module_param_sysfs_setup - setup sysfs support for one module | |
501 | * @mod: module | |
502 | * @kparam: module parameters (array) | |
503 | * @num_params: number of module parameters | |
504 | * | |
505 | * Adds sysfs entries for module parameters, and creates a link from | |
506 | * /sys/module/[mod->name]/parameters to /sys/parameters/[mod->name]/ | |
507 | */ | |
508 | int module_param_sysfs_setup(struct module *mod, | |
509 | struct kernel_param *kparam, | |
510 | unsigned int num_params) | |
511 | { | |
512 | struct module_param_attrs *mp; | |
513 | ||
514 | mp = param_sysfs_setup(&mod->mkobj, kparam, num_params, 0); | |
515 | if (IS_ERR(mp)) | |
516 | return PTR_ERR(mp); | |
517 | ||
518 | mod->param_attrs = mp; | |
519 | return 0; | |
520 | } | |
521 | ||
522 | /* | |
523 | * module_param_sysfs_remove - remove sysfs support for one module | |
524 | * @mod: module | |
525 | * | |
526 | * Remove sysfs entries for module parameters and the corresponding | |
527 | * kobject. | |
528 | */ | |
529 | void module_param_sysfs_remove(struct module *mod) | |
530 | { | |
531 | if (mod->param_attrs) { | |
532 | sysfs_remove_group(&mod->mkobj.kobj, | |
533 | &mod->param_attrs->grp); | |
534 | /* We are positive that no one is using any param | |
535 | * attrs at this point. Deallocate immediately. */ | |
536 | kfree(mod->param_attrs); | |
537 | mod->param_attrs = NULL; | |
538 | } | |
539 | } | |
540 | #endif | |
541 | ||
542 | /* | |
543 | * kernel_param_sysfs_setup - wrapper for built-in params support | |
544 | */ | |
545 | static void __init kernel_param_sysfs_setup(const char *name, | |
546 | struct kernel_param *kparam, | |
547 | unsigned int num_params, | |
548 | unsigned int name_skip) | |
549 | { | |
550 | struct module_kobject *mk; | |
551 | ||
dd392710 PE |
552 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); |
553 | BUG_ON(!mk); | |
1da177e4 LT |
554 | |
555 | mk->mod = THIS_MODULE; | |
556 | kobj_set_kset_s(mk, module_subsys); | |
557 | kobject_set_name(&mk->kobj, name); | |
558 | kobject_register(&mk->kobj); | |
559 | ||
560 | /* no need to keep the kobject if no parameter is exported */ | |
561 | if (!param_sysfs_setup(mk, kparam, num_params, name_skip)) { | |
562 | kobject_unregister(&mk->kobj); | |
563 | kfree(mk); | |
564 | } | |
565 | } | |
566 | ||
567 | /* | |
568 | * param_sysfs_builtin - add contents in /sys/parameters for built-in modules | |
569 | * | |
570 | * Add module_parameters to sysfs for "modules" built into the kernel. | |
571 | * | |
572 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the | |
573 | * "parameter" name is stored behind a dot in kernel_param->name. So, | |
574 | * extract the "module" name for all built-in kernel_param-eters, | |
575 | * and for all who have the same, call kernel_param_sysfs_setup. | |
576 | */ | |
577 | static void __init param_sysfs_builtin(void) | |
578 | { | |
579 | struct kernel_param *kp, *kp_begin = NULL; | |
580 | unsigned int i, name_len, count = 0; | |
581 | char modname[MAX_KBUILD_MODNAME + 1] = ""; | |
582 | ||
583 | for (i=0; i < __stop___param - __start___param; i++) { | |
584 | char *dot; | |
585 | ||
586 | kp = &__start___param[i]; | |
587 | ||
588 | /* We do not handle args without periods. */ | |
589 | dot = memchr(kp->name, '.', MAX_KBUILD_MODNAME); | |
590 | if (!dot) { | |
591 | DEBUGP("couldn't find period in %s\n", kp->name); | |
592 | continue; | |
593 | } | |
594 | name_len = dot - kp->name; | |
595 | ||
596 | /* new kbuild_modname? */ | |
597 | if (strlen(modname) != name_len | |
598 | || strncmp(modname, kp->name, name_len) != 0) { | |
599 | /* add a new kobject for previous kernel_params. */ | |
600 | if (count) | |
601 | kernel_param_sysfs_setup(modname, | |
602 | kp_begin, | |
603 | count, | |
604 | strlen(modname)+1); | |
605 | ||
606 | strncpy(modname, kp->name, name_len); | |
607 | modname[name_len] = '\0'; | |
608 | count = 0; | |
609 | kp_begin = kp; | |
610 | } | |
611 | count++; | |
612 | } | |
613 | ||
614 | /* last kernel_params need to be registered as well */ | |
615 | if (count) | |
616 | kernel_param_sysfs_setup(modname, kp_begin, count, | |
617 | strlen(modname)+1); | |
618 | } | |
619 | ||
620 | ||
621 | /* module-related sysfs stuff */ | |
9e283939 | 622 | #ifdef CONFIG_SYSFS |
1da177e4 LT |
623 | |
624 | #define to_module_attr(n) container_of(n, struct module_attribute, attr); | |
625 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj); | |
626 | ||
627 | static ssize_t module_attr_show(struct kobject *kobj, | |
628 | struct attribute *attr, | |
629 | char *buf) | |
630 | { | |
631 | struct module_attribute *attribute; | |
632 | struct module_kobject *mk; | |
633 | int ret; | |
634 | ||
635 | attribute = to_module_attr(attr); | |
636 | mk = to_module_kobject(kobj); | |
637 | ||
638 | if (!attribute->show) | |
70f2817a | 639 | return -EIO; |
1da177e4 LT |
640 | |
641 | if (!try_module_get(mk->mod)) | |
642 | return -ENODEV; | |
643 | ||
644 | ret = attribute->show(attribute, mk->mod, buf); | |
645 | ||
646 | module_put(mk->mod); | |
647 | ||
648 | return ret; | |
649 | } | |
650 | ||
651 | static ssize_t module_attr_store(struct kobject *kobj, | |
652 | struct attribute *attr, | |
653 | const char *buf, size_t len) | |
654 | { | |
655 | struct module_attribute *attribute; | |
656 | struct module_kobject *mk; | |
657 | int ret; | |
658 | ||
659 | attribute = to_module_attr(attr); | |
660 | mk = to_module_kobject(kobj); | |
661 | ||
662 | if (!attribute->store) | |
70f2817a | 663 | return -EIO; |
1da177e4 LT |
664 | |
665 | if (!try_module_get(mk->mod)) | |
666 | return -ENODEV; | |
667 | ||
668 | ret = attribute->store(attribute, mk->mod, buf, len); | |
669 | ||
670 | module_put(mk->mod); | |
671 | ||
672 | return ret; | |
673 | } | |
674 | ||
675 | static struct sysfs_ops module_sysfs_ops = { | |
676 | .show = module_attr_show, | |
677 | .store = module_attr_store, | |
678 | }; | |
679 | ||
680 | #else | |
681 | static struct sysfs_ops module_sysfs_ops = { | |
682 | .show = NULL, | |
683 | .store = NULL, | |
684 | }; | |
685 | #endif | |
686 | ||
687 | static struct kobj_type module_ktype = { | |
688 | .sysfs_ops = &module_sysfs_ops, | |
689 | }; | |
690 | ||
691 | decl_subsys(module, &module_ktype, NULL); | |
692 | ||
693 | /* | |
694 | * param_sysfs_init - wrapper for built-in params support | |
695 | */ | |
696 | static int __init param_sysfs_init(void) | |
697 | { | |
698 | subsystem_register(&module_subsys); | |
699 | ||
700 | param_sysfs_builtin(); | |
701 | ||
702 | return 0; | |
703 | } | |
704 | __initcall(param_sysfs_init); | |
705 | ||
706 | EXPORT_SYMBOL(param_set_byte); | |
707 | EXPORT_SYMBOL(param_get_byte); | |
708 | EXPORT_SYMBOL(param_set_short); | |
709 | EXPORT_SYMBOL(param_get_short); | |
710 | EXPORT_SYMBOL(param_set_ushort); | |
711 | EXPORT_SYMBOL(param_get_ushort); | |
712 | EXPORT_SYMBOL(param_set_int); | |
713 | EXPORT_SYMBOL(param_get_int); | |
714 | EXPORT_SYMBOL(param_set_uint); | |
715 | EXPORT_SYMBOL(param_get_uint); | |
716 | EXPORT_SYMBOL(param_set_long); | |
717 | EXPORT_SYMBOL(param_get_long); | |
718 | EXPORT_SYMBOL(param_set_ulong); | |
719 | EXPORT_SYMBOL(param_get_ulong); | |
720 | EXPORT_SYMBOL(param_set_charp); | |
721 | EXPORT_SYMBOL(param_get_charp); | |
722 | EXPORT_SYMBOL(param_set_bool); | |
723 | EXPORT_SYMBOL(param_get_bool); | |
724 | EXPORT_SYMBOL(param_set_invbool); | |
725 | EXPORT_SYMBOL(param_get_invbool); | |
726 | EXPORT_SYMBOL(param_array_set); | |
727 | EXPORT_SYMBOL(param_array_get); | |
728 | EXPORT_SYMBOL(param_set_copystring); | |
729 | EXPORT_SYMBOL(param_get_string); |