]>
Commit | Line | Data |
---|---|---|
a9499fa7 TG |
1 | /* |
2 | * Originally from efivars.c, | |
3 | * | |
4 | * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com> | |
5 | * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com> | |
6 | * | |
7 | * This code takes all variables accessible from EFI runtime and | |
8 | * exports them via sysfs | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
24 | * Changelog: | |
25 | * | |
26 | * 17 May 2004 - Matt Domsch <Matt_Domsch@dell.com> | |
27 | * remove check for efi_enabled in exit | |
28 | * add MODULE_VERSION | |
29 | * | |
30 | * 26 Apr 2004 - Matt Domsch <Matt_Domsch@dell.com> | |
31 | * minor bug fixes | |
32 | * | |
33 | * 21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@intel.com) | |
34 | * converted driver to export variable information via sysfs | |
35 | * and moved to drivers/firmware directory | |
36 | * bumped revision number to v0.07 to reflect conversion & move | |
37 | * | |
38 | * 10 Dec 2002 - Matt Domsch <Matt_Domsch@dell.com> | |
39 | * fix locking per Peter Chubb's findings | |
40 | * | |
41 | * 25 Mar 2002 - Matt Domsch <Matt_Domsch@dell.com> | |
42 | * move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse() | |
43 | * | |
44 | * 12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com> | |
45 | * use list_for_each_safe when deleting vars. | |
46 | * remove ifdef CONFIG_SMP around include <linux/smp.h> | |
47 | * v0.04 release to linux-ia64@linuxia64.org | |
48 | * | |
49 | * 20 April 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
50 | * Moved vars from /proc/efi to /proc/efi/vars, and made | |
51 | * efi.c own the /proc/efi directory. | |
52 | * v0.03 release to linux-ia64@linuxia64.org | |
53 | * | |
54 | * 26 March 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
55 | * At the request of Stephane, moved ownership of /proc/efi | |
56 | * to efi.c, and now efivars lives under /proc/efi/vars. | |
57 | * | |
58 | * 12 March 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
59 | * Feedback received from Stephane Eranian incorporated. | |
60 | * efivar_write() checks copy_from_user() return value. | |
61 | * efivar_read/write() returns proper errno. | |
62 | * v0.02 release to linux-ia64@linuxia64.org | |
63 | * | |
64 | * 26 February 2001 - Matt Domsch <Matt_Domsch@dell.com> | |
65 | * v0.01 release to linux-ia64@linuxia64.org | |
66 | */ | |
67 | ||
68 | #include <linux/efi.h> | |
69 | #include <linux/module.h> | |
20b4fb48 | 70 | #include <linux/slab.h> |
a614e192 | 71 | #include <linux/ucs2_string.h> |
a9499fa7 TG |
72 | |
73 | #define EFIVARS_VERSION "0.08" | |
74 | #define EFIVARS_DATE "2004-May-17" | |
75 | ||
76 | MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); | |
77 | MODULE_DESCRIPTION("sysfs interface to EFI Variables"); | |
78 | MODULE_LICENSE("GPL"); | |
79 | MODULE_VERSION(EFIVARS_VERSION); | |
80 | ||
81 | LIST_HEAD(efivar_sysfs_list); | |
82 | EXPORT_SYMBOL_GPL(efivar_sysfs_list); | |
83 | ||
84 | static struct kset *efivars_kset; | |
85 | ||
86 | static struct bin_attribute *efivars_new_var; | |
87 | static struct bin_attribute *efivars_del_var; | |
88 | ||
89 | struct efivar_attribute { | |
90 | struct attribute attr; | |
91 | ssize_t (*show) (struct efivar_entry *entry, char *buf); | |
92 | ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); | |
93 | }; | |
94 | ||
95 | #define EFIVAR_ATTR(_name, _mode, _show, _store) \ | |
96 | struct efivar_attribute efivar_attr_##_name = { \ | |
97 | .attr = {.name = __stringify(_name), .mode = _mode}, \ | |
98 | .show = _show, \ | |
99 | .store = _store, \ | |
100 | }; | |
101 | ||
102 | #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) | |
103 | #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) | |
104 | ||
105 | /* | |
106 | * Prototype for sysfs creation function | |
107 | */ | |
108 | static int | |
109 | efivar_create_sysfs_entry(struct efivar_entry *new_var); | |
110 | ||
111 | static ssize_t | |
112 | efivar_guid_read(struct efivar_entry *entry, char *buf) | |
113 | { | |
114 | struct efi_variable *var = &entry->var; | |
115 | char *str = buf; | |
116 | ||
117 | if (!entry || !buf) | |
118 | return 0; | |
119 | ||
120 | efi_guid_unparse(&var->VendorGuid, str); | |
121 | str += strlen(str); | |
122 | str += sprintf(str, "\n"); | |
123 | ||
124 | return str - buf; | |
125 | } | |
126 | ||
127 | static ssize_t | |
128 | efivar_attr_read(struct efivar_entry *entry, char *buf) | |
129 | { | |
130 | struct efi_variable *var = &entry->var; | |
131 | char *str = buf; | |
132 | ||
133 | if (!entry || !buf) | |
134 | return -EINVAL; | |
135 | ||
136 | var->DataSize = 1024; | |
137 | if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) | |
138 | return -EIO; | |
139 | ||
140 | if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) | |
141 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); | |
142 | if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) | |
143 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); | |
144 | if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) | |
145 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); | |
146 | if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) | |
147 | str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); | |
148 | if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) | |
149 | str += sprintf(str, | |
150 | "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); | |
151 | if (var->Attributes & | |
152 | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) | |
153 | str += sprintf(str, | |
154 | "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); | |
155 | if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) | |
156 | str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); | |
157 | return str - buf; | |
158 | } | |
159 | ||
160 | static ssize_t | |
161 | efivar_size_read(struct efivar_entry *entry, char *buf) | |
162 | { | |
163 | struct efi_variable *var = &entry->var; | |
164 | char *str = buf; | |
165 | ||
166 | if (!entry || !buf) | |
167 | return -EINVAL; | |
168 | ||
169 | var->DataSize = 1024; | |
170 | if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) | |
171 | return -EIO; | |
172 | ||
173 | str += sprintf(str, "0x%lx\n", var->DataSize); | |
174 | return str - buf; | |
175 | } | |
176 | ||
177 | static ssize_t | |
178 | efivar_data_read(struct efivar_entry *entry, char *buf) | |
179 | { | |
180 | struct efi_variable *var = &entry->var; | |
181 | ||
182 | if (!entry || !buf) | |
183 | return -EINVAL; | |
184 | ||
185 | var->DataSize = 1024; | |
186 | if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) | |
187 | return -EIO; | |
188 | ||
189 | memcpy(buf, var->Data, var->DataSize); | |
190 | return var->DataSize; | |
191 | } | |
192 | /* | |
193 | * We allow each variable to be edited via rewriting the | |
194 | * entire efi variable structure. | |
195 | */ | |
196 | static ssize_t | |
197 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) | |
198 | { | |
199 | struct efi_variable *new_var, *var = &entry->var; | |
200 | int err; | |
201 | ||
202 | if (count != sizeof(struct efi_variable)) | |
203 | return -EINVAL; | |
204 | ||
205 | new_var = (struct efi_variable *)buf; | |
206 | /* | |
207 | * If only updating the variable data, then the name | |
208 | * and guid should remain the same | |
209 | */ | |
210 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || | |
211 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { | |
212 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); | |
213 | return -EINVAL; | |
214 | } | |
215 | ||
216 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ | |
217 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); | |
218 | return -EINVAL; | |
219 | } | |
220 | ||
221 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || | |
222 | efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) { | |
223 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
224 | return -EINVAL; | |
225 | } | |
226 | ||
227 | memcpy(&entry->var, new_var, count); | |
228 | ||
229 | err = efivar_entry_set(entry, new_var->Attributes, | |
69e60841 | 230 | new_var->DataSize, new_var->Data, NULL); |
a9499fa7 TG |
231 | if (err) { |
232 | printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err); | |
233 | return -EIO; | |
234 | } | |
235 | ||
236 | return count; | |
237 | } | |
238 | ||
239 | static ssize_t | |
240 | efivar_show_raw(struct efivar_entry *entry, char *buf) | |
241 | { | |
242 | struct efi_variable *var = &entry->var; | |
243 | ||
244 | if (!entry || !buf) | |
245 | return 0; | |
246 | ||
247 | var->DataSize = 1024; | |
248 | if (efivar_entry_get(entry, &entry->var.Attributes, | |
249 | &entry->var.DataSize, entry->var.Data)) | |
250 | return -EIO; | |
251 | ||
252 | memcpy(buf, var, sizeof(*var)); | |
253 | ||
254 | return sizeof(*var); | |
255 | } | |
256 | ||
257 | /* | |
258 | * Generic read/write functions that call the specific functions of | |
259 | * the attributes... | |
260 | */ | |
261 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, | |
262 | char *buf) | |
263 | { | |
264 | struct efivar_entry *var = to_efivar_entry(kobj); | |
265 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
266 | ssize_t ret = -EIO; | |
267 | ||
268 | if (!capable(CAP_SYS_ADMIN)) | |
269 | return -EACCES; | |
270 | ||
271 | if (efivar_attr->show) { | |
272 | ret = efivar_attr->show(var, buf); | |
273 | } | |
274 | return ret; | |
275 | } | |
276 | ||
277 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, | |
278 | const char *buf, size_t count) | |
279 | { | |
280 | struct efivar_entry *var = to_efivar_entry(kobj); | |
281 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
282 | ssize_t ret = -EIO; | |
283 | ||
284 | if (!capable(CAP_SYS_ADMIN)) | |
285 | return -EACCES; | |
286 | ||
287 | if (efivar_attr->store) | |
288 | ret = efivar_attr->store(var, buf, count); | |
289 | ||
290 | return ret; | |
291 | } | |
292 | ||
293 | static const struct sysfs_ops efivar_attr_ops = { | |
294 | .show = efivar_attr_show, | |
295 | .store = efivar_attr_store, | |
296 | }; | |
297 | ||
298 | static void efivar_release(struct kobject *kobj) | |
299 | { | |
300 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); | |
301 | kfree(var); | |
302 | } | |
303 | ||
304 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); | |
305 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); | |
306 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); | |
307 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); | |
308 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); | |
309 | ||
310 | static struct attribute *def_attrs[] = { | |
311 | &efivar_attr_guid.attr, | |
312 | &efivar_attr_size.attr, | |
313 | &efivar_attr_attributes.attr, | |
314 | &efivar_attr_data.attr, | |
315 | &efivar_attr_raw_var.attr, | |
316 | NULL, | |
317 | }; | |
318 | ||
319 | static struct kobj_type efivar_ktype = { | |
320 | .release = efivar_release, | |
321 | .sysfs_ops = &efivar_attr_ops, | |
322 | .default_attrs = def_attrs, | |
323 | }; | |
324 | ||
325 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, | |
326 | struct bin_attribute *bin_attr, | |
327 | char *buf, loff_t pos, size_t count) | |
328 | { | |
329 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
330 | struct efivar_entry *new_entry; | |
331 | int err; | |
332 | ||
333 | if (!capable(CAP_SYS_ADMIN)) | |
334 | return -EACCES; | |
335 | ||
336 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || | |
337 | efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) { | |
338 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
339 | return -EINVAL; | |
340 | } | |
341 | ||
342 | new_entry = kzalloc(sizeof(*new_entry), GFP_KERNEL); | |
343 | if (!new_entry) | |
344 | return -ENOMEM; | |
345 | ||
346 | memcpy(&new_entry->var, new_var, sizeof(*new_var)); | |
347 | ||
348 | err = efivar_entry_set(new_entry, new_var->Attributes, new_var->DataSize, | |
349 | new_var->Data, &efivar_sysfs_list); | |
350 | if (err) { | |
351 | if (err == -EEXIST) | |
352 | err = -EINVAL; | |
353 | goto out; | |
354 | } | |
355 | ||
356 | if (efivar_create_sysfs_entry(new_entry)) { | |
357 | printk(KERN_WARNING "efivars: failed to create sysfs entry.\n"); | |
358 | kfree(new_entry); | |
359 | } | |
360 | return count; | |
361 | ||
362 | out: | |
363 | kfree(new_entry); | |
364 | return err; | |
365 | } | |
366 | ||
367 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, | |
368 | struct bin_attribute *bin_attr, | |
369 | char *buf, loff_t pos, size_t count) | |
370 | { | |
371 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
372 | struct efivar_entry *entry; | |
373 | int err = 0; | |
374 | ||
375 | if (!capable(CAP_SYS_ADMIN)) | |
376 | return -EACCES; | |
377 | ||
378 | efivar_entry_iter_begin(); | |
379 | entry = efivar_entry_find(del_var->VariableName, del_var->VendorGuid, | |
380 | &efivar_sysfs_list, true); | |
381 | if (!entry) | |
382 | err = -EINVAL; | |
383 | else if (__efivar_entry_delete(entry)) | |
384 | err = -EIO; | |
385 | ||
e0d59733 SA |
386 | if (err) { |
387 | efivar_entry_iter_end(); | |
a9499fa7 | 388 | return err; |
e0d59733 | 389 | } |
a9499fa7 | 390 | |
e0d59733 SA |
391 | if (!entry->scanning) { |
392 | efivar_entry_iter_end(); | |
393 | efivar_unregister(entry); | |
394 | } else | |
395 | efivar_entry_iter_end(); | |
a9499fa7 TG |
396 | |
397 | /* It's dead Jim.... */ | |
398 | return count; | |
399 | } | |
400 | ||
401 | /** | |
402 | * efivar_create_sysfs_entry - create a new entry in sysfs | |
403 | * @new_var: efivar entry to create | |
404 | * | |
405 | * Returns 1 on failure, 0 on success | |
406 | */ | |
407 | static int | |
408 | efivar_create_sysfs_entry(struct efivar_entry *new_var) | |
409 | { | |
410 | int i, short_name_size; | |
411 | char *short_name; | |
412 | unsigned long variable_name_size; | |
413 | efi_char16_t *variable_name; | |
414 | ||
415 | variable_name = new_var->var.VariableName; | |
a614e192 | 416 | variable_name_size = ucs2_strlen(variable_name) * sizeof(efi_char16_t); |
a9499fa7 TG |
417 | |
418 | /* | |
419 | * Length of the variable bytes in ASCII, plus the '-' separator, | |
420 | * plus the GUID, plus trailing NUL | |
421 | */ | |
422 | short_name_size = variable_name_size / sizeof(efi_char16_t) | |
423 | + 1 + EFI_VARIABLE_GUID_LEN + 1; | |
424 | ||
425 | short_name = kzalloc(short_name_size, GFP_KERNEL); | |
426 | ||
7b2dd6d2 | 427 | if (!short_name) |
a9499fa7 | 428 | return 1; |
a9499fa7 TG |
429 | |
430 | /* Convert Unicode to normal chars (assume top bits are 0), | |
431 | ala UTF-8 */ | |
432 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
433 | short_name[i] = variable_name[i] & 0xFF; | |
434 | } | |
435 | /* This is ugly, but necessary to separate one vendor's | |
436 | private variables from another's. */ | |
437 | ||
438 | *(short_name + strlen(short_name)) = '-'; | |
439 | efi_guid_unparse(&new_var->var.VendorGuid, | |
440 | short_name + strlen(short_name)); | |
441 | ||
442 | new_var->kobj.kset = efivars_kset; | |
443 | ||
444 | i = kobject_init_and_add(&new_var->kobj, &efivar_ktype, | |
445 | NULL, "%s", short_name); | |
446 | kfree(short_name); | |
447 | if (i) | |
448 | return 1; | |
449 | ||
450 | kobject_uevent(&new_var->kobj, KOBJ_ADD); | |
451 | efivar_entry_add(new_var, &efivar_sysfs_list); | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | static int | |
457 | create_efivars_bin_attributes(void) | |
458 | { | |
459 | struct bin_attribute *attr; | |
460 | int error; | |
461 | ||
462 | /* new_var */ | |
463 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
464 | if (!attr) | |
465 | return -ENOMEM; | |
466 | ||
467 | attr->attr.name = "new_var"; | |
468 | attr->attr.mode = 0200; | |
469 | attr->write = efivar_create; | |
470 | efivars_new_var = attr; | |
471 | ||
472 | /* del_var */ | |
473 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
474 | if (!attr) { | |
475 | error = -ENOMEM; | |
476 | goto out_free; | |
477 | } | |
478 | attr->attr.name = "del_var"; | |
479 | attr->attr.mode = 0200; | |
480 | attr->write = efivar_delete; | |
481 | efivars_del_var = attr; | |
482 | ||
483 | sysfs_bin_attr_init(efivars_new_var); | |
484 | sysfs_bin_attr_init(efivars_del_var); | |
485 | ||
486 | /* Register */ | |
487 | error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_new_var); | |
488 | if (error) { | |
489 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
490 | " due to error %d\n", error); | |
491 | goto out_free; | |
492 | } | |
493 | ||
494 | error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_del_var); | |
495 | if (error) { | |
496 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
497 | " due to error %d\n", error); | |
498 | sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var); | |
499 | goto out_free; | |
500 | } | |
501 | ||
502 | return 0; | |
503 | out_free: | |
504 | kfree(efivars_del_var); | |
505 | efivars_del_var = NULL; | |
506 | kfree(efivars_new_var); | |
507 | efivars_new_var = NULL; | |
508 | return error; | |
509 | } | |
510 | ||
511 | static int efivar_update_sysfs_entry(efi_char16_t *name, efi_guid_t vendor, | |
512 | unsigned long name_size, void *data) | |
513 | { | |
514 | struct efivar_entry *entry = data; | |
515 | ||
516 | if (efivar_entry_find(name, vendor, &efivar_sysfs_list, false)) | |
517 | return 0; | |
518 | ||
519 | memcpy(entry->var.VariableName, name, name_size); | |
520 | memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t)); | |
521 | ||
522 | return 1; | |
523 | } | |
524 | ||
525 | static void efivar_update_sysfs_entries(struct work_struct *work) | |
526 | { | |
527 | struct efivar_entry *entry; | |
528 | int err; | |
529 | ||
a9499fa7 TG |
530 | /* Add new sysfs entries */ |
531 | while (1) { | |
d51df2c5 SA |
532 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
533 | if (!entry) | |
534 | return; | |
a9499fa7 TG |
535 | |
536 | err = efivar_init(efivar_update_sysfs_entry, entry, | |
537 | true, false, &efivar_sysfs_list); | |
538 | if (!err) | |
539 | break; | |
540 | ||
541 | efivar_create_sysfs_entry(entry); | |
542 | } | |
543 | ||
544 | kfree(entry); | |
545 | } | |
546 | ||
547 | static int efivars_sysfs_callback(efi_char16_t *name, efi_guid_t vendor, | |
548 | unsigned long name_size, void *data) | |
549 | { | |
550 | struct efivar_entry *entry; | |
551 | ||
552 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
553 | if (!entry) | |
554 | return -ENOMEM; | |
555 | ||
556 | memcpy(entry->var.VariableName, name, name_size); | |
557 | memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t)); | |
558 | ||
559 | efivar_create_sysfs_entry(entry); | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
564 | static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data) | |
565 | { | |
566 | efivar_entry_remove(entry); | |
567 | efivar_unregister(entry); | |
568 | return 0; | |
569 | } | |
570 | ||
6f9dd30c | 571 | static void efivars_sysfs_exit(void) |
a9499fa7 TG |
572 | { |
573 | /* Remove all entries and destroy */ | |
574 | __efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list, NULL, NULL); | |
575 | ||
576 | if (efivars_new_var) | |
577 | sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var); | |
578 | if (efivars_del_var) | |
579 | sysfs_remove_bin_file(&efivars_kset->kobj, efivars_del_var); | |
580 | kfree(efivars_new_var); | |
581 | kfree(efivars_del_var); | |
582 | kset_unregister(efivars_kset); | |
583 | } | |
584 | ||
585 | int efivars_sysfs_init(void) | |
586 | { | |
587 | struct kobject *parent_kobj = efivars_kobject(); | |
588 | int error = 0; | |
589 | ||
d320c079 MF |
590 | if (!efi_enabled(EFI_RUNTIME_SERVICES)) |
591 | return -ENODEV; | |
592 | ||
a9499fa7 TG |
593 | /* No efivars has been registered yet */ |
594 | if (!parent_kobj) | |
595 | return 0; | |
596 | ||
597 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | |
598 | EFIVARS_DATE); | |
599 | ||
600 | efivars_kset = kset_create_and_add("vars", NULL, parent_kobj); | |
601 | if (!efivars_kset) { | |
602 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); | |
603 | return -ENOMEM; | |
604 | } | |
605 | ||
606 | efivar_init(efivars_sysfs_callback, NULL, false, | |
607 | true, &efivar_sysfs_list); | |
608 | ||
609 | error = create_efivars_bin_attributes(); | |
610 | if (error) { | |
611 | efivars_sysfs_exit(); | |
612 | return error; | |
613 | } | |
614 | ||
615 | INIT_WORK(&efivar_work, efivar_update_sysfs_entries); | |
616 | ||
617 | return 0; | |
618 | } | |
619 | EXPORT_SYMBOL_GPL(efivars_sysfs_init); | |
620 | ||
621 | module_init(efivars_sysfs_init); | |
622 | module_exit(efivars_sysfs_exit); |