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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> | |
26 | ||
27 | #if 0 | |
28 | #define DEBUGP printk | |
29 | #else | |
30 | #define DEBUGP(fmt, a...) | |
31 | #endif | |
32 | ||
33 | static inline int dash2underscore(char c) | |
34 | { | |
35 | if (c == '-') | |
36 | return '_'; | |
37 | return c; | |
38 | } | |
39 | ||
40 | static inline int parameq(const char *input, const char *paramname) | |
41 | { | |
42 | unsigned int i; | |
43 | for (i = 0; dash2underscore(input[i]) == paramname[i]; i++) | |
44 | if (input[i] == '\0') | |
45 | return 1; | |
46 | return 0; | |
47 | } | |
48 | ||
49 | static int parse_one(char *param, | |
50 | char *val, | |
51 | struct kernel_param *params, | |
52 | unsigned num_params, | |
53 | int (*handle_unknown)(char *param, char *val)) | |
54 | { | |
55 | unsigned int i; | |
56 | ||
57 | /* Find parameter */ | |
58 | for (i = 0; i < num_params; i++) { | |
59 | if (parameq(param, params[i].name)) { | |
60 | DEBUGP("They are equal! Calling %p\n", | |
61 | params[i].set); | |
62 | return params[i].set(val, ¶ms[i]); | |
63 | } | |
64 | } | |
65 | ||
66 | if (handle_unknown) { | |
67 | DEBUGP("Unknown argument: calling %p\n", handle_unknown); | |
68 | return handle_unknown(param, val); | |
69 | } | |
70 | ||
71 | DEBUGP("Unknown argument `%s'\n", param); | |
72 | return -ENOENT; | |
73 | } | |
74 | ||
75 | /* You can use " around spaces, but can't escape ". */ | |
76 | /* Hyphens and underscores equivalent in parameter names. */ | |
77 | static char *next_arg(char *args, char **param, char **val) | |
78 | { | |
79 | unsigned int i, equals = 0; | |
80 | int in_quote = 0, quoted = 0; | |
81 | char *next; | |
82 | ||
83 | /* Chew any extra spaces */ | |
84 | while (*args == ' ') args++; | |
85 | if (*args == '"') { | |
86 | args++; | |
87 | in_quote = 1; | |
88 | quoted = 1; | |
89 | } | |
90 | ||
91 | for (i = 0; args[i]; i++) { | |
92 | if (args[i] == ' ' && !in_quote) | |
93 | break; | |
94 | if (equals == 0) { | |
95 | if (args[i] == '=') | |
96 | equals = i; | |
97 | } | |
98 | if (args[i] == '"') | |
99 | in_quote = !in_quote; | |
100 | } | |
101 | ||
102 | *param = args; | |
103 | if (!equals) | |
104 | *val = NULL; | |
105 | else { | |
106 | args[equals] = '\0'; | |
107 | *val = args + equals + 1; | |
108 | ||
109 | /* Don't include quotes in value. */ | |
110 | if (**val == '"') { | |
111 | (*val)++; | |
112 | if (args[i-1] == '"') | |
113 | args[i-1] = '\0'; | |
114 | } | |
115 | if (quoted && args[i-1] == '"') | |
116 | args[i-1] = '\0'; | |
117 | } | |
118 | ||
119 | if (args[i]) { | |
120 | args[i] = '\0'; | |
121 | next = args + i + 1; | |
122 | } else | |
123 | next = args + i; | |
124 | return next; | |
125 | } | |
126 | ||
127 | /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ | |
128 | int parse_args(const char *name, | |
129 | char *args, | |
130 | struct kernel_param *params, | |
131 | unsigned num, | |
132 | int (*unknown)(char *param, char *val)) | |
133 | { | |
134 | char *param, *val; | |
135 | ||
136 | DEBUGP("Parsing ARGS: %s\n", args); | |
137 | ||
138 | while (*args) { | |
139 | int ret; | |
140 | ||
141 | args = next_arg(args, ¶m, &val); | |
142 | ret = parse_one(param, val, params, num, unknown); | |
143 | switch (ret) { | |
144 | case -ENOENT: | |
145 | printk(KERN_ERR "%s: Unknown parameter `%s'\n", | |
146 | name, param); | |
147 | return ret; | |
148 | case -ENOSPC: | |
149 | printk(KERN_ERR | |
150 | "%s: `%s' too large for parameter `%s'\n", | |
151 | name, val ?: "", param); | |
152 | return ret; | |
153 | case 0: | |
154 | break; | |
155 | default: | |
156 | printk(KERN_ERR | |
157 | "%s: `%s' invalid for parameter `%s'\n", | |
158 | name, val ?: "", param); | |
159 | return ret; | |
160 | } | |
161 | } | |
162 | ||
163 | /* All parsed OK. */ | |
164 | return 0; | |
165 | } | |
166 | ||
167 | /* Lazy bastard, eh? */ | |
168 | #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \ | |
169 | int param_set_##name(const char *val, struct kernel_param *kp) \ | |
170 | { \ | |
171 | char *endp; \ | |
172 | tmptype l; \ | |
173 | \ | |
174 | if (!val) return -EINVAL; \ | |
175 | l = strtolfn(val, &endp, 0); \ | |
176 | if (endp == val || ((type)l != l)) \ | |
177 | return -EINVAL; \ | |
178 | *((type *)kp->arg) = l; \ | |
179 | return 0; \ | |
180 | } \ | |
181 | int param_get_##name(char *buffer, struct kernel_param *kp) \ | |
182 | { \ | |
183 | return sprintf(buffer, format, *((type *)kp->arg)); \ | |
184 | } | |
185 | ||
186 | STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, simple_strtoul); | |
187 | STANDARD_PARAM_DEF(short, short, "%hi", long, simple_strtol); | |
188 | STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, simple_strtoul); | |
189 | STANDARD_PARAM_DEF(int, int, "%i", long, simple_strtol); | |
190 | STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, simple_strtoul); | |
191 | STANDARD_PARAM_DEF(long, long, "%li", long, simple_strtol); | |
192 | STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, simple_strtoul); | |
193 | ||
194 | int param_set_charp(const char *val, struct kernel_param *kp) | |
195 | { | |
196 | if (!val) { | |
197 | printk(KERN_ERR "%s: string parameter expected\n", | |
198 | kp->name); | |
199 | return -EINVAL; | |
200 | } | |
201 | ||
202 | if (strlen(val) > 1024) { | |
203 | printk(KERN_ERR "%s: string parameter too long\n", | |
204 | kp->name); | |
205 | return -ENOSPC; | |
206 | } | |
207 | ||
208 | *(char **)kp->arg = (char *)val; | |
209 | return 0; | |
210 | } | |
211 | ||
212 | int param_get_charp(char *buffer, struct kernel_param *kp) | |
213 | { | |
214 | return sprintf(buffer, "%s", *((char **)kp->arg)); | |
215 | } | |
216 | ||
217 | int param_set_bool(const char *val, struct kernel_param *kp) | |
218 | { | |
219 | /* No equals means "set"... */ | |
220 | if (!val) val = "1"; | |
221 | ||
222 | /* One of =[yYnN01] */ | |
223 | switch (val[0]) { | |
224 | case 'y': case 'Y': case '1': | |
225 | *(int *)kp->arg = 1; | |
226 | return 0; | |
227 | case 'n': case 'N': case '0': | |
228 | *(int *)kp->arg = 0; | |
229 | return 0; | |
230 | } | |
231 | return -EINVAL; | |
232 | } | |
233 | ||
234 | int param_get_bool(char *buffer, struct kernel_param *kp) | |
235 | { | |
236 | /* Y and N chosen as being relatively non-coder friendly */ | |
237 | return sprintf(buffer, "%c", (*(int *)kp->arg) ? 'Y' : 'N'); | |
238 | } | |
239 | ||
240 | int param_set_invbool(const char *val, struct kernel_param *kp) | |
241 | { | |
242 | int boolval, ret; | |
243 | struct kernel_param dummy = { .arg = &boolval }; | |
244 | ||
245 | ret = param_set_bool(val, &dummy); | |
246 | if (ret == 0) | |
247 | *(int *)kp->arg = !boolval; | |
248 | return ret; | |
249 | } | |
250 | ||
251 | int param_get_invbool(char *buffer, struct kernel_param *kp) | |
252 | { | |
253 | int val; | |
254 | struct kernel_param dummy = { .arg = &val }; | |
255 | ||
256 | val = !*(int *)kp->arg; | |
257 | return param_get_bool(buffer, &dummy); | |
258 | } | |
259 | ||
260 | /* We cheat here and temporarily mangle the string. */ | |
261 | int param_array(const char *name, | |
262 | const char *val, | |
263 | unsigned int min, unsigned int max, | |
264 | void *elem, int elemsize, | |
265 | int (*set)(const char *, struct kernel_param *kp), | |
266 | int *num) | |
267 | { | |
268 | int ret; | |
269 | struct kernel_param kp; | |
270 | char save; | |
271 | ||
272 | /* Get the name right for errors. */ | |
273 | kp.name = name; | |
274 | kp.arg = elem; | |
275 | ||
276 | /* No equals sign? */ | |
277 | if (!val) { | |
278 | printk(KERN_ERR "%s: expects arguments\n", name); | |
279 | return -EINVAL; | |
280 | } | |
281 | ||
282 | *num = 0; | |
283 | /* We expect a comma-separated list of values. */ | |
284 | do { | |
285 | int len; | |
286 | ||
287 | if (*num == max) { | |
288 | printk(KERN_ERR "%s: can only take %i arguments\n", | |
289 | name, max); | |
290 | return -EINVAL; | |
291 | } | |
292 | len = strcspn(val, ","); | |
293 | ||
294 | /* nul-terminate and parse */ | |
295 | save = val[len]; | |
296 | ((char *)val)[len] = '\0'; | |
297 | ret = set(val, &kp); | |
298 | ||
299 | if (ret != 0) | |
300 | return ret; | |
301 | kp.arg += elemsize; | |
302 | val += len+1; | |
303 | (*num)++; | |
304 | } while (save == ','); | |
305 | ||
306 | if (*num < min) { | |
307 | printk(KERN_ERR "%s: needs at least %i arguments\n", | |
308 | name, min); | |
309 | return -EINVAL; | |
310 | } | |
311 | return 0; | |
312 | } | |
313 | ||
314 | int param_array_set(const char *val, struct kernel_param *kp) | |
315 | { | |
316 | struct kparam_array *arr = kp->arg; | |
31143a12 | 317 | unsigned int temp_num; |
1da177e4 LT |
318 | |
319 | return param_array(kp->name, val, 1, arr->max, arr->elem, | |
31143a12 | 320 | arr->elemsize, arr->set, arr->num ?: &temp_num); |
1da177e4 LT |
321 | } |
322 | ||
323 | int param_array_get(char *buffer, struct kernel_param *kp) | |
324 | { | |
325 | int i, off, ret; | |
326 | struct kparam_array *arr = kp->arg; | |
327 | struct kernel_param p; | |
328 | ||
329 | p = *kp; | |
330 | for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { | |
331 | if (i) | |
332 | buffer[off++] = ','; | |
333 | p.arg = arr->elem + arr->elemsize * i; | |
334 | ret = arr->get(buffer + off, &p); | |
335 | if (ret < 0) | |
336 | return ret; | |
337 | off += ret; | |
338 | } | |
339 | buffer[off] = '\0'; | |
340 | return off; | |
341 | } | |
342 | ||
343 | int param_set_copystring(const char *val, struct kernel_param *kp) | |
344 | { | |
345 | struct kparam_string *kps = kp->arg; | |
346 | ||
347 | if (strlen(val)+1 > kps->maxlen) { | |
348 | printk(KERN_ERR "%s: string doesn't fit in %u chars.\n", | |
349 | kp->name, kps->maxlen-1); | |
350 | return -ENOSPC; | |
351 | } | |
352 | strcpy(kps->string, val); | |
353 | return 0; | |
354 | } | |
355 | ||
356 | int param_get_string(char *buffer, struct kernel_param *kp) | |
357 | { | |
358 | struct kparam_string *kps = kp->arg; | |
359 | return strlcpy(buffer, kps->string, kps->maxlen); | |
360 | } | |
361 | ||
362 | /* sysfs output in /sys/modules/XYZ/parameters/ */ | |
363 | ||
364 | extern struct kernel_param __start___param[], __stop___param[]; | |
365 | ||
366 | #define MAX_KBUILD_MODNAME KOBJ_NAME_LEN | |
367 | ||
368 | struct param_attribute | |
369 | { | |
370 | struct module_attribute mattr; | |
371 | struct kernel_param *param; | |
372 | }; | |
373 | ||
374 | struct module_param_attrs | |
375 | { | |
376 | struct attribute_group grp; | |
377 | struct param_attribute attrs[0]; | |
378 | }; | |
379 | ||
380 | #define to_param_attr(n) container_of(n, struct param_attribute, mattr); | |
381 | ||
382 | static ssize_t param_attr_show(struct module_attribute *mattr, | |
383 | struct module *mod, char *buf) | |
384 | { | |
385 | int count; | |
386 | struct param_attribute *attribute = to_param_attr(mattr); | |
387 | ||
388 | if (!attribute->param->get) | |
389 | return -EPERM; | |
390 | ||
391 | count = attribute->param->get(buf, attribute->param); | |
392 | if (count > 0) { | |
393 | strcat(buf, "\n"); | |
394 | ++count; | |
395 | } | |
396 | return count; | |
397 | } | |
398 | ||
399 | /* sysfs always hands a nul-terminated string in buf. We rely on that. */ | |
400 | static ssize_t param_attr_store(struct module_attribute *mattr, | |
401 | struct module *owner, | |
402 | const char *buf, size_t len) | |
403 | { | |
404 | int err; | |
405 | struct param_attribute *attribute = to_param_attr(mattr); | |
406 | ||
407 | if (!attribute->param->set) | |
408 | return -EPERM; | |
409 | ||
410 | err = attribute->param->set(buf, attribute->param); | |
411 | if (!err) | |
412 | return len; | |
413 | return err; | |
414 | } | |
415 | ||
416 | #ifdef CONFIG_MODULES | |
417 | #define __modinit | |
418 | #else | |
419 | #define __modinit __init | |
420 | #endif | |
421 | ||
422 | /* | |
423 | * param_sysfs_setup - setup sysfs support for one module or KBUILD_MODNAME | |
424 | * @mk: struct module_kobject (contains parent kobject) | |
425 | * @kparam: array of struct kernel_param, the actual parameter definitions | |
426 | * @num_params: number of entries in array | |
427 | * @name_skip: offset where the parameter name start in kparam[].name. Needed for built-in "modules" | |
428 | * | |
429 | * Create a kobject for a (per-module) group of parameters, and create files | |
430 | * in sysfs. A pointer to the param_kobject is returned on success, | |
431 | * NULL if there's no parameter to export, or other ERR_PTR(err). | |
432 | */ | |
433 | static __modinit struct module_param_attrs * | |
434 | param_sysfs_setup(struct module_kobject *mk, | |
435 | struct kernel_param *kparam, | |
436 | unsigned int num_params, | |
437 | unsigned int name_skip) | |
438 | { | |
439 | struct module_param_attrs *mp; | |
440 | unsigned int valid_attrs = 0; | |
441 | unsigned int i, size[2]; | |
442 | struct param_attribute *pattr; | |
443 | struct attribute **gattr; | |
444 | int err; | |
445 | ||
446 | for (i=0; i<num_params; i++) { | |
447 | if (kparam[i].perm) | |
448 | valid_attrs++; | |
449 | } | |
450 | ||
451 | if (!valid_attrs) | |
452 | return NULL; | |
453 | ||
454 | size[0] = ALIGN(sizeof(*mp) + | |
455 | valid_attrs * sizeof(mp->attrs[0]), | |
456 | sizeof(mp->grp.attrs[0])); | |
457 | size[1] = (valid_attrs + 1) * sizeof(mp->grp.attrs[0]); | |
458 | ||
459 | mp = kmalloc(size[0] + size[1], GFP_KERNEL); | |
460 | if (!mp) | |
461 | return ERR_PTR(-ENOMEM); | |
462 | ||
463 | mp->grp.name = "parameters"; | |
464 | mp->grp.attrs = (void *)mp + size[0]; | |
465 | ||
466 | pattr = &mp->attrs[0]; | |
467 | gattr = &mp->grp.attrs[0]; | |
468 | for (i = 0; i < num_params; i++) { | |
469 | struct kernel_param *kp = &kparam[i]; | |
470 | if (kp->perm) { | |
471 | pattr->param = kp; | |
472 | pattr->mattr.show = param_attr_show; | |
473 | pattr->mattr.store = param_attr_store; | |
474 | pattr->mattr.attr.name = (char *)&kp->name[name_skip]; | |
475 | pattr->mattr.attr.owner = mk->mod; | |
476 | pattr->mattr.attr.mode = kp->perm; | |
477 | *(gattr++) = &(pattr++)->mattr.attr; | |
478 | } | |
479 | } | |
480 | *gattr = NULL; | |
481 | ||
482 | if ((err = sysfs_create_group(&mk->kobj, &mp->grp))) { | |
483 | kfree(mp); | |
484 | return ERR_PTR(err); | |
485 | } | |
486 | return mp; | |
487 | } | |
488 | ||
489 | ||
490 | #ifdef CONFIG_MODULES | |
491 | ||
492 | /* | |
493 | * module_param_sysfs_setup - setup sysfs support for one module | |
494 | * @mod: module | |
495 | * @kparam: module parameters (array) | |
496 | * @num_params: number of module parameters | |
497 | * | |
498 | * Adds sysfs entries for module parameters, and creates a link from | |
499 | * /sys/module/[mod->name]/parameters to /sys/parameters/[mod->name]/ | |
500 | */ | |
501 | int module_param_sysfs_setup(struct module *mod, | |
502 | struct kernel_param *kparam, | |
503 | unsigned int num_params) | |
504 | { | |
505 | struct module_param_attrs *mp; | |
506 | ||
507 | mp = param_sysfs_setup(&mod->mkobj, kparam, num_params, 0); | |
508 | if (IS_ERR(mp)) | |
509 | return PTR_ERR(mp); | |
510 | ||
511 | mod->param_attrs = mp; | |
512 | return 0; | |
513 | } | |
514 | ||
515 | /* | |
516 | * module_param_sysfs_remove - remove sysfs support for one module | |
517 | * @mod: module | |
518 | * | |
519 | * Remove sysfs entries for module parameters and the corresponding | |
520 | * kobject. | |
521 | */ | |
522 | void module_param_sysfs_remove(struct module *mod) | |
523 | { | |
524 | if (mod->param_attrs) { | |
525 | sysfs_remove_group(&mod->mkobj.kobj, | |
526 | &mod->param_attrs->grp); | |
527 | /* We are positive that no one is using any param | |
528 | * attrs at this point. Deallocate immediately. */ | |
529 | kfree(mod->param_attrs); | |
530 | mod->param_attrs = NULL; | |
531 | } | |
532 | } | |
533 | #endif | |
534 | ||
535 | /* | |
536 | * kernel_param_sysfs_setup - wrapper for built-in params support | |
537 | */ | |
538 | static void __init kernel_param_sysfs_setup(const char *name, | |
539 | struct kernel_param *kparam, | |
540 | unsigned int num_params, | |
541 | unsigned int name_skip) | |
542 | { | |
543 | struct module_kobject *mk; | |
544 | ||
545 | mk = kmalloc(sizeof(struct module_kobject), GFP_KERNEL); | |
546 | memset(mk, 0, sizeof(struct module_kobject)); | |
547 | ||
548 | mk->mod = THIS_MODULE; | |
549 | kobj_set_kset_s(mk, module_subsys); | |
550 | kobject_set_name(&mk->kobj, name); | |
551 | kobject_register(&mk->kobj); | |
552 | ||
553 | /* no need to keep the kobject if no parameter is exported */ | |
554 | if (!param_sysfs_setup(mk, kparam, num_params, name_skip)) { | |
555 | kobject_unregister(&mk->kobj); | |
556 | kfree(mk); | |
557 | } | |
558 | } | |
559 | ||
560 | /* | |
561 | * param_sysfs_builtin - add contents in /sys/parameters for built-in modules | |
562 | * | |
563 | * Add module_parameters to sysfs for "modules" built into the kernel. | |
564 | * | |
565 | * The "module" name (KBUILD_MODNAME) is stored before a dot, the | |
566 | * "parameter" name is stored behind a dot in kernel_param->name. So, | |
567 | * extract the "module" name for all built-in kernel_param-eters, | |
568 | * and for all who have the same, call kernel_param_sysfs_setup. | |
569 | */ | |
570 | static void __init param_sysfs_builtin(void) | |
571 | { | |
572 | struct kernel_param *kp, *kp_begin = NULL; | |
573 | unsigned int i, name_len, count = 0; | |
574 | char modname[MAX_KBUILD_MODNAME + 1] = ""; | |
575 | ||
576 | for (i=0; i < __stop___param - __start___param; i++) { | |
577 | char *dot; | |
578 | ||
579 | kp = &__start___param[i]; | |
580 | ||
581 | /* We do not handle args without periods. */ | |
582 | dot = memchr(kp->name, '.', MAX_KBUILD_MODNAME); | |
583 | if (!dot) { | |
584 | DEBUGP("couldn't find period in %s\n", kp->name); | |
585 | continue; | |
586 | } | |
587 | name_len = dot - kp->name; | |
588 | ||
589 | /* new kbuild_modname? */ | |
590 | if (strlen(modname) != name_len | |
591 | || strncmp(modname, kp->name, name_len) != 0) { | |
592 | /* add a new kobject for previous kernel_params. */ | |
593 | if (count) | |
594 | kernel_param_sysfs_setup(modname, | |
595 | kp_begin, | |
596 | count, | |
597 | strlen(modname)+1); | |
598 | ||
599 | strncpy(modname, kp->name, name_len); | |
600 | modname[name_len] = '\0'; | |
601 | count = 0; | |
602 | kp_begin = kp; | |
603 | } | |
604 | count++; | |
605 | } | |
606 | ||
607 | /* last kernel_params need to be registered as well */ | |
608 | if (count) | |
609 | kernel_param_sysfs_setup(modname, kp_begin, count, | |
610 | strlen(modname)+1); | |
611 | } | |
612 | ||
613 | ||
614 | /* module-related sysfs stuff */ | |
615 | #ifdef CONFIG_MODULES | |
616 | ||
617 | #define to_module_attr(n) container_of(n, struct module_attribute, attr); | |
618 | #define to_module_kobject(n) container_of(n, struct module_kobject, kobj); | |
619 | ||
620 | static ssize_t module_attr_show(struct kobject *kobj, | |
621 | struct attribute *attr, | |
622 | char *buf) | |
623 | { | |
624 | struct module_attribute *attribute; | |
625 | struct module_kobject *mk; | |
626 | int ret; | |
627 | ||
628 | attribute = to_module_attr(attr); | |
629 | mk = to_module_kobject(kobj); | |
630 | ||
631 | if (!attribute->show) | |
70f2817a | 632 | return -EIO; |
1da177e4 LT |
633 | |
634 | if (!try_module_get(mk->mod)) | |
635 | return -ENODEV; | |
636 | ||
637 | ret = attribute->show(attribute, mk->mod, buf); | |
638 | ||
639 | module_put(mk->mod); | |
640 | ||
641 | return ret; | |
642 | } | |
643 | ||
644 | static ssize_t module_attr_store(struct kobject *kobj, | |
645 | struct attribute *attr, | |
646 | const char *buf, size_t len) | |
647 | { | |
648 | struct module_attribute *attribute; | |
649 | struct module_kobject *mk; | |
650 | int ret; | |
651 | ||
652 | attribute = to_module_attr(attr); | |
653 | mk = to_module_kobject(kobj); | |
654 | ||
655 | if (!attribute->store) | |
70f2817a | 656 | return -EIO; |
1da177e4 LT |
657 | |
658 | if (!try_module_get(mk->mod)) | |
659 | return -ENODEV; | |
660 | ||
661 | ret = attribute->store(attribute, mk->mod, buf, len); | |
662 | ||
663 | module_put(mk->mod); | |
664 | ||
665 | return ret; | |
666 | } | |
667 | ||
668 | static struct sysfs_ops module_sysfs_ops = { | |
669 | .show = module_attr_show, | |
670 | .store = module_attr_store, | |
671 | }; | |
672 | ||
673 | #else | |
674 | static struct sysfs_ops module_sysfs_ops = { | |
675 | .show = NULL, | |
676 | .store = NULL, | |
677 | }; | |
678 | #endif | |
679 | ||
680 | static struct kobj_type module_ktype = { | |
681 | .sysfs_ops = &module_sysfs_ops, | |
682 | }; | |
683 | ||
684 | decl_subsys(module, &module_ktype, NULL); | |
685 | ||
686 | /* | |
687 | * param_sysfs_init - wrapper for built-in params support | |
688 | */ | |
689 | static int __init param_sysfs_init(void) | |
690 | { | |
691 | subsystem_register(&module_subsys); | |
692 | ||
693 | param_sysfs_builtin(); | |
694 | ||
695 | return 0; | |
696 | } | |
697 | __initcall(param_sysfs_init); | |
698 | ||
699 | EXPORT_SYMBOL(param_set_byte); | |
700 | EXPORT_SYMBOL(param_get_byte); | |
701 | EXPORT_SYMBOL(param_set_short); | |
702 | EXPORT_SYMBOL(param_get_short); | |
703 | EXPORT_SYMBOL(param_set_ushort); | |
704 | EXPORT_SYMBOL(param_get_ushort); | |
705 | EXPORT_SYMBOL(param_set_int); | |
706 | EXPORT_SYMBOL(param_get_int); | |
707 | EXPORT_SYMBOL(param_set_uint); | |
708 | EXPORT_SYMBOL(param_get_uint); | |
709 | EXPORT_SYMBOL(param_set_long); | |
710 | EXPORT_SYMBOL(param_get_long); | |
711 | EXPORT_SYMBOL(param_set_ulong); | |
712 | EXPORT_SYMBOL(param_get_ulong); | |
713 | EXPORT_SYMBOL(param_set_charp); | |
714 | EXPORT_SYMBOL(param_get_charp); | |
715 | EXPORT_SYMBOL(param_set_bool); | |
716 | EXPORT_SYMBOL(param_get_bool); | |
717 | EXPORT_SYMBOL(param_set_invbool); | |
718 | EXPORT_SYMBOL(param_get_invbool); | |
719 | EXPORT_SYMBOL(param_array_set); | |
720 | EXPORT_SYMBOL(param_array_get); | |
721 | EXPORT_SYMBOL(param_set_copystring); | |
722 | EXPORT_SYMBOL(param_get_string); |