Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 26 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
| 28 | #if 0 |
| 29 | #define DEBUGP printk |
| 30 | #else |
| 31 | #define DEBUGP(fmt, a...) |
| 32 | #endif |
| 33 | |
Eric Sesterhenn | b9e20a9 | 2006-03-28 01:56:24 -0800 | [diff] [blame] | 34 | static inline char dash2underscore(char c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Rusty Russell | f36462f | 2005-09-27 21:45:34 -0700 | [diff] [blame] | 123 | |
| 124 | /* Chew up trailing spaces. */ |
| 125 | while (*next == ' ') |
| 126 | next++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Rusty Russell | f36462f | 2005-09-27 21:45:34 -0700 | [diff] [blame] | 141 | /* Chew leading spaces */ |
| 142 | while (*args == ' ') |
| 143 | args++; |
| 144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. */ |
Adrian Bunk | 9871728 | 2006-03-25 03:07:06 -0800 | [diff] [blame] | 268 | static 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Bert Wesarg | 31143a1 | 2005-04-16 15:25:42 -0700 | [diff] [blame] | 324 | unsigned int temp_num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | |
| 326 | return param_array(kp->name, val, 1, arr->max, arr->elem, |
Bert Wesarg | 31143a1 | 2005-04-16 15:25:42 -0700 | [diff] [blame] | 327 | arr->elemsize, arr->set, arr->num ?: &temp_num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Pekka J Enberg | dd39271 | 2005-09-06 15:18:31 -0700 | [diff] [blame] | 552 | mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); |
| 553 | BUG_ON(!mk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Jason Wessel | 9e28393 | 2005-12-20 15:21:24 +0100 | [diff] [blame] | 622 | #ifdef CONFIG_SYSFS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |
Dmitry Torokhov | 70f2817 | 2005-04-29 01:27:34 -0500 | [diff] [blame] | 639 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | ret = attribute->show(attribute, mk->mod, buf); |
| 642 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | return ret; |
| 644 | } |
| 645 | |
| 646 | static ssize_t module_attr_store(struct kobject *kobj, |
| 647 | struct attribute *attr, |
| 648 | const char *buf, size_t len) |
| 649 | { |
| 650 | struct module_attribute *attribute; |
| 651 | struct module_kobject *mk; |
| 652 | int ret; |
| 653 | |
| 654 | attribute = to_module_attr(attr); |
| 655 | mk = to_module_kobject(kobj); |
| 656 | |
| 657 | if (!attribute->store) |
Dmitry Torokhov | 70f2817 | 2005-04-29 01:27:34 -0500 | [diff] [blame] | 658 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | ret = attribute->store(attribute, mk->mod, buf, len); |
| 661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | return ret; |
| 663 | } |
| 664 | |
| 665 | static struct sysfs_ops module_sysfs_ops = { |
| 666 | .show = module_attr_show, |
| 667 | .store = module_attr_store, |
| 668 | }; |
| 669 | |
| 670 | #else |
| 671 | static struct sysfs_ops module_sysfs_ops = { |
| 672 | .show = NULL, |
| 673 | .store = NULL, |
| 674 | }; |
| 675 | #endif |
| 676 | |
| 677 | static struct kobj_type module_ktype = { |
| 678 | .sysfs_ops = &module_sysfs_ops, |
| 679 | }; |
| 680 | |
| 681 | decl_subsys(module, &module_ktype, NULL); |
| 682 | |
| 683 | /* |
| 684 | * param_sysfs_init - wrapper for built-in params support |
| 685 | */ |
| 686 | static int __init param_sysfs_init(void) |
| 687 | { |
| 688 | subsystem_register(&module_subsys); |
| 689 | |
| 690 | param_sysfs_builtin(); |
| 691 | |
| 692 | return 0; |
| 693 | } |
| 694 | __initcall(param_sysfs_init); |
| 695 | |
| 696 | EXPORT_SYMBOL(param_set_byte); |
| 697 | EXPORT_SYMBOL(param_get_byte); |
| 698 | EXPORT_SYMBOL(param_set_short); |
| 699 | EXPORT_SYMBOL(param_get_short); |
| 700 | EXPORT_SYMBOL(param_set_ushort); |
| 701 | EXPORT_SYMBOL(param_get_ushort); |
| 702 | EXPORT_SYMBOL(param_set_int); |
| 703 | EXPORT_SYMBOL(param_get_int); |
| 704 | EXPORT_SYMBOL(param_set_uint); |
| 705 | EXPORT_SYMBOL(param_get_uint); |
| 706 | EXPORT_SYMBOL(param_set_long); |
| 707 | EXPORT_SYMBOL(param_get_long); |
| 708 | EXPORT_SYMBOL(param_set_ulong); |
| 709 | EXPORT_SYMBOL(param_get_ulong); |
| 710 | EXPORT_SYMBOL(param_set_charp); |
| 711 | EXPORT_SYMBOL(param_get_charp); |
| 712 | EXPORT_SYMBOL(param_set_bool); |
| 713 | EXPORT_SYMBOL(param_get_bool); |
| 714 | EXPORT_SYMBOL(param_set_invbool); |
| 715 | EXPORT_SYMBOL(param_get_invbool); |
| 716 | EXPORT_SYMBOL(param_array_set); |
| 717 | EXPORT_SYMBOL(param_array_get); |
| 718 | EXPORT_SYMBOL(param_set_copystring); |
| 719 | EXPORT_SYMBOL(param_get_string); |