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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Think LMI BIOS configuration driver
4 *
5 * Copyright(C) 2019-2021 Lenovo
6 *
7 * Original code from Thinkpad-wmi project https://github.com/iksaif/thinkpad-wmi
8 * Copyright(C) 2017 Corentin Chary <corentin.chary@gmail.com>
9 * Distributed under the GPL-2.0 license
10 */
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/acpi.h>
15#include <linux/errno.h>
16#include <linux/fs.h>
17#include <linux/string.h>
18#include <linux/types.h>
19#include <linux/dmi.h>
20#include <linux/wmi.h>
21#include "firmware_attributes_class.h"
22#include "think-lmi.h"
23
24static bool debug_support;
25module_param(debug_support, bool, 0444);
26MODULE_PARM_DESC(debug_support, "Enable debug command support");
27
28/*
29 * Name: BiosSetting
30 * Description: Get item name and settings for current LMI instance.
31 * Type: Query
32 * Returns: "Item,Value"
33 * Example: "WakeOnLAN,Enable"
34 */
35#define LENOVO_BIOS_SETTING_GUID "51F5230E-9677-46CD-A1CF-C0B23EE34DB7"
36
37/*
38 * Name: SetBiosSetting
39 * Description: Change the BIOS setting to the desired value using the SetBiosSetting
40 * class. To save the settings, use the SaveBiosSetting class.
41 * BIOS settings and values are case sensitive.
42 * After making changes to the BIOS settings, you must reboot the computer
43 * before the changes will take effect.
44 * Type: Method
45 * Arguments: "Item,Value,Password,Encoding,KbdLang;"
46 * Example: "WakeOnLAN,Disable,pa55w0rd,ascii,us;"
47 */
48#define LENOVO_SET_BIOS_SETTINGS_GUID "98479A64-33F5-4E33-A707-8E251EBBC3A1"
49
50/*
51 * Name: SaveBiosSettings
52 * Description: Save any pending changes in settings.
53 * Type: Method
54 * Arguments: "Password,Encoding,KbdLang;"
55 * Example: "pa55w0rd,ascii,us;"
56 */
57#define LENOVO_SAVE_BIOS_SETTINGS_GUID "6A4B54EF-A5ED-4D33-9455-B0D9B48DF4B3"
58
59/*
60 * Name: BiosPasswordSettings
61 * Description: Return BIOS Password settings
62 * Type: Query
63 * Returns: PasswordMode, PasswordState, MinLength, MaxLength,
64 * SupportedEncoding, SupportedKeyboard
65 */
66#define LENOVO_BIOS_PASSWORD_SETTINGS_GUID "8ADB159E-1E32-455C-BC93-308A7ED98246"
67
68/*
69 * Name: SetBiosPassword
70 * Description: Change a specific password.
71 * - BIOS settings cannot be changed at the same boot as power-on
72 * passwords (POP) and hard disk passwords (HDP). If you want to change
73 * BIOS settings and POP or HDP, you must reboot the system after changing
74 * one of them.
75 * - A password cannot be set using this method when one does not already
76 * exist. Passwords can only be updated or cleared.
77 * Type: Method
78 * Arguments: "PasswordType,CurrentPassword,NewPassword,Encoding,KbdLang;"
79 * Example: "pop,pa55w0rd,newpa55w0rd,ascii,us;”
80 */
81#define LENOVO_SET_BIOS_PASSWORD_GUID "2651D9FD-911C-4B69-B94E-D0DED5963BD7"
82
83/*
84 * Name: GetBiosSelections
85 * Description: Return a list of valid settings for a given item.
86 * Type: Method
87 * Arguments: "Item"
88 * Returns: "Value1,Value2,Value3,..."
89 * Example:
90 * -> "FlashOverLAN"
91 * <- "Enabled,Disabled"
92 */
93#define LENOVO_GET_BIOS_SELECTIONS_GUID "7364651A-132F-4FE7-ADAA-40C6C7EE2E3B"
94
95/*
96 * Name: DebugCmd
97 * Description: Debug entry method for entering debug commands to the BIOS
98 */
99#define LENOVO_DEBUG_CMD_GUID "7FF47003-3B6C-4E5E-A227-E979824A85D1"
100
101/*
102 * Name: OpcodeIF
103 * Description: Opcode interface which provides the ability to set multiple
104 * parameters and then trigger an action with a final command.
105 * This is particularly useful for simplifying setting passwords.
106 * With this support comes the ability to set System, HDD and NVMe
107 * passwords.
108 * This is currently available on ThinkCenter and ThinkStations platforms
109 */
110#define LENOVO_OPCODE_IF_GUID "DFDDEF2C-57D4-48ce-B196-0FB787D90836"
111
112/*
113 * Name: SetBiosCert
114 * Description: Install BIOS certificate.
115 * Type: Method
116 * Arguments: "Certificate,Password"
117 * You must reboot the computer before the changes will take effect.
118 */
119#define LENOVO_SET_BIOS_CERT_GUID "26861C9F-47E9-44C4-BD8B-DFE7FA2610FE"
120
121/*
122 * Name: UpdateBiosCert
123 * Description: Update BIOS certificate.
124 * Type: Method
125 * Format: "Certificate,Signature"
126 * You must reboot the computer before the changes will take effect.
127 */
128#define LENOVO_UPDATE_BIOS_CERT_GUID "9AA3180A-9750-41F7-B9F7-D5D3B1BAC3CE"
129
130/*
131 * Name: ClearBiosCert
132 * Description: Uninstall BIOS certificate.
133 * Type: Method
134 * Format: "Serial,Signature"
135 * You must reboot the computer before the changes will take effect.
136 */
137#define LENOVO_CLEAR_BIOS_CERT_GUID "B2BC39A7-78DD-4D71-B059-A510DEC44890"
138/*
139 * Name: CertToPassword
140 * Description: Switch from certificate to password authentication.
141 * Type: Method
142 * Format: "Password,Signature"
143 * You must reboot the computer before the changes will take effect.
144 */
145#define LENOVO_CERT_TO_PASSWORD_GUID "0DE8590D-5510-4044-9621-77C227F5A70D"
146
147/*
148 * Name: SetBiosSettingCert
149 * Description: Set attribute using certificate authentication.
150 * Type: Method
151 * Format: "Item,Value,Signature"
152 */
153#define LENOVO_SET_BIOS_SETTING_CERT_GUID "34A008CC-D205-4B62-9E67-31DFA8B90003"
154
155/*
156 * Name: SaveBiosSettingCert
157 * Description: Save any pending changes in settings.
158 * Type: Method
159 * Format: "Signature"
160 */
161#define LENOVO_SAVE_BIOS_SETTING_CERT_GUID "C050FB9D-DF5F-4606-B066-9EFC401B2551"
162
163/*
164 * Name: CertThumbprint
165 * Description: Display Certificate thumbprints
166 * Type: Query
167 * Returns: MD5, SHA1 & SHA256 thumbprints
168 */
169#define LENOVO_CERT_THUMBPRINT_GUID "C59119ED-1C0D-4806-A8E9-59AA318176C4"
170
171#define TLMI_POP_PWD (1 << 0)
172#define TLMI_PAP_PWD (1 << 1)
173#define TLMI_HDD_PWD (1 << 2)
174#define TLMI_SYS_PWD (1 << 3)
175#define TLMI_CERT (1 << 7)
176
177#define to_tlmi_pwd_setting(kobj) container_of(kobj, struct tlmi_pwd_setting, kobj)
178#define to_tlmi_attr_setting(kobj) container_of(kobj, struct tlmi_attr_setting, kobj)
179
180static const struct tlmi_err_codes tlmi_errs[] = {
181 {"Success", 0},
182 {"Not Supported", -EOPNOTSUPP},
183 {"Invalid Parameter", -EINVAL},
184 {"Access Denied", -EACCES},
185 {"System Busy", -EBUSY},
186};
187
188static const char * const encoding_options[] = {
189 [TLMI_ENCODING_ASCII] = "ascii",
190 [TLMI_ENCODING_SCANCODE] = "scancode",
191};
192static const char * const level_options[] = {
193 [TLMI_LEVEL_USER] = "user",
194 [TLMI_LEVEL_MASTER] = "master",
195};
196static struct think_lmi tlmi_priv;
197static struct class *fw_attr_class;
198
199/* ------ Utility functions ------------*/
200/* Strip out CR if one is present */
201static void strip_cr(char *str)
202{
203 char *p = strchrnul(str, '\n');
204 *p = '\0';
205}
206
207/* Convert BIOS WMI error string to suitable error code */
208static int tlmi_errstr_to_err(const char *errstr)
209{
210 int i;
211
212 for (i = 0; i < sizeof(tlmi_errs)/sizeof(struct tlmi_err_codes); i++) {
213 if (!strcmp(tlmi_errs[i].err_str, errstr))
214 return tlmi_errs[i].err_code;
215 }
216 return -EPERM;
217}
218
219/* Extract error string from WMI return buffer */
220static int tlmi_extract_error(const struct acpi_buffer *output)
221{
222 const union acpi_object *obj;
223
224 obj = output->pointer;
225 if (!obj)
226 return -ENOMEM;
227 if (obj->type != ACPI_TYPE_STRING || !obj->string.pointer)
228 return -EIO;
229
230 return tlmi_errstr_to_err(obj->string.pointer);
231}
232
233/* Utility function to execute WMI call to BIOS */
234static int tlmi_simple_call(const char *guid, const char *arg)
235{
236 const struct acpi_buffer input = { strlen(arg), (char *)arg };
237 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
238 acpi_status status;
239 int i, err;
240
241 /*
242 * Duplicated call required to match BIOS workaround for behavior
243 * seen when WMI accessed via scripting on other OS.
244 */
245 for (i = 0; i < 2; i++) {
246 /* (re)initialize output buffer to default state */
247 output.length = ACPI_ALLOCATE_BUFFER;
248 output.pointer = NULL;
249
250 status = wmi_evaluate_method(guid, 0, 0, &input, &output);
251 if (ACPI_FAILURE(status)) {
252 kfree(output.pointer);
253 return -EIO;
254 }
255 err = tlmi_extract_error(&output);
256 kfree(output.pointer);
257 if (err)
258 return err;
259 }
260 return 0;
261}
262
263/* Extract output string from WMI return buffer */
264static int tlmi_extract_output_string(const struct acpi_buffer *output,
265 char **string)
266{
267 const union acpi_object *obj;
268 char *s;
269
270 obj = output->pointer;
271 if (!obj)
272 return -ENOMEM;
273 if (obj->type != ACPI_TYPE_STRING || !obj->string.pointer)
274 return -EIO;
275
276 s = kstrdup(obj->string.pointer, GFP_KERNEL);
277 if (!s)
278 return -ENOMEM;
279 *string = s;
280 return 0;
281}
282
283/* ------ Core interface functions ------------*/
284
285/* Get password settings from BIOS */
286static int tlmi_get_pwd_settings(struct tlmi_pwdcfg *pwdcfg)
287{
288 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
289 const union acpi_object *obj;
290 acpi_status status;
291 int copy_size;
292
293 if (!tlmi_priv.can_get_password_settings)
294 return -EOPNOTSUPP;
295
296 status = wmi_query_block(LENOVO_BIOS_PASSWORD_SETTINGS_GUID, 0,
297 &output);
298 if (ACPI_FAILURE(status))
299 return -EIO;
300
301 obj = output.pointer;
302 if (!obj)
303 return -ENOMEM;
304 if (obj->type != ACPI_TYPE_BUFFER || !obj->buffer.pointer) {
305 kfree(obj);
306 return -EIO;
307 }
308 /*
309 * The size of thinkpad_wmi_pcfg on ThinkStation is larger than ThinkPad.
310 * To make the driver compatible on different brands, we permit it to get
311 * the data in below case.
312 * Settings must have at minimum the core fields available
313 */
314 if (obj->buffer.length < sizeof(struct tlmi_pwdcfg_core)) {
315 pr_warn("Unknown pwdcfg buffer length %d\n", obj->buffer.length);
316 kfree(obj);
317 return -EIO;
318 }
319
320 copy_size = obj->buffer.length < sizeof(struct tlmi_pwdcfg) ?
321 obj->buffer.length : sizeof(struct tlmi_pwdcfg);
322 memcpy(pwdcfg, obj->buffer.pointer, copy_size);
323 kfree(obj);
324
325 if (WARN_ON(pwdcfg->core.max_length >= TLMI_PWD_BUFSIZE))
326 pwdcfg->core.max_length = TLMI_PWD_BUFSIZE - 1;
327 return 0;
328}
329
330static int tlmi_save_bios_settings(const char *password)
331{
332 return tlmi_simple_call(LENOVO_SAVE_BIOS_SETTINGS_GUID,
333 password);
334}
335
336static int tlmi_opcode_setting(char *setting, const char *value)
337{
338 char *opcode_str;
339 int ret;
340
341 opcode_str = kasprintf(GFP_KERNEL, "%s:%s;", setting, value);
342 if (!opcode_str)
343 return -ENOMEM;
344
345 ret = tlmi_simple_call(LENOVO_OPCODE_IF_GUID, opcode_str);
346 kfree(opcode_str);
347 return ret;
348}
349
350static int tlmi_setting(int item, char **value, const char *guid_string)
351{
352 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
353 acpi_status status;
354 int ret;
355
356 status = wmi_query_block(guid_string, item, &output);
357 if (ACPI_FAILURE(status)) {
358 kfree(output.pointer);
359 return -EIO;
360 }
361
362 ret = tlmi_extract_output_string(&output, value);
363 kfree(output.pointer);
364 return ret;
365}
366
367static int tlmi_get_bios_selections(const char *item, char **value)
368{
369 const struct acpi_buffer input = { strlen(item), (char *)item };
370 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
371 acpi_status status;
372 int ret;
373
374 status = wmi_evaluate_method(LENOVO_GET_BIOS_SELECTIONS_GUID,
375 0, 0, &input, &output);
376
377 if (ACPI_FAILURE(status)) {
378 kfree(output.pointer);
379 return -EIO;
380 }
381
382 ret = tlmi_extract_output_string(&output, value);
383 kfree(output.pointer);
384 return ret;
385}
386
387/* ---- Authentication sysfs --------------------------------------------------------- */
388static ssize_t is_enabled_show(struct kobject *kobj, struct kobj_attribute *attr,
389 char *buf)
390{
391 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
392
393 return sysfs_emit(buf, "%d\n", setting->valid);
394}
395
396static struct kobj_attribute auth_is_pass_set = __ATTR_RO(is_enabled);
397
398static ssize_t current_password_store(struct kobject *kobj,
399 struct kobj_attribute *attr,
400 const char *buf, size_t count)
401{
402 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
403 size_t pwdlen;
404
405 pwdlen = strlen(buf);
406 /* pwdlen == 0 is allowed to clear the password */
407 if (pwdlen && ((pwdlen < setting->minlen) || (pwdlen > setting->maxlen)))
408 return -EINVAL;
409
410 strscpy(setting->password, buf, setting->maxlen);
411 /* Strip out CR if one is present, setting password won't work if it is present */
412 strip_cr(setting->password);
413 return count;
414}
415
416static struct kobj_attribute auth_current_password = __ATTR_WO(current_password);
417
418static ssize_t new_password_store(struct kobject *kobj,
419 struct kobj_attribute *attr,
420 const char *buf, size_t count)
421{
422 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
423 char *auth_str, *new_pwd;
424 size_t pwdlen;
425 int ret;
426
427 if (!capable(CAP_SYS_ADMIN))
428 return -EPERM;
429
430 if (!tlmi_priv.can_set_bios_password)
431 return -EOPNOTSUPP;
432
433 new_pwd = kstrdup(buf, GFP_KERNEL);
434 if (!new_pwd)
435 return -ENOMEM;
436
437 /* Strip out CR if one is present, setting password won't work if it is present */
438 strip_cr(new_pwd);
439
440 pwdlen = strlen(new_pwd);
441 /* pwdlen == 0 is allowed to clear the password */
442 if (pwdlen && ((pwdlen < setting->minlen) || (pwdlen > setting->maxlen))) {
443 ret = -EINVAL;
444 goto out;
445 }
446
447 /* If opcode support is present use that interface */
448 if (tlmi_priv.opcode_support) {
449 char pwd_type[8];
450
451 /* Special handling required for HDD and NVMe passwords */
452 if (setting == tlmi_priv.pwd_hdd) {
453 if (setting->level == TLMI_LEVEL_USER)
454 sprintf(pwd_type, "uhdp%d", setting->index);
455 else
456 sprintf(pwd_type, "mhdp%d", setting->index);
457 } else if (setting == tlmi_priv.pwd_nvme) {
458 if (setting->level == TLMI_LEVEL_USER)
459 sprintf(pwd_type, "unvp%d", setting->index);
460 else
461 sprintf(pwd_type, "mnvp%d", setting->index);
462 } else {
463 sprintf(pwd_type, "%s", setting->pwd_type);
464 }
465
466 ret = tlmi_opcode_setting("WmiOpcodePasswordType", pwd_type);
467 if (ret)
468 goto out;
469
470 if (tlmi_priv.pwd_admin->valid) {
471 ret = tlmi_opcode_setting("WmiOpcodePasswordAdmin",
472 tlmi_priv.pwd_admin->password);
473 if (ret)
474 goto out;
475 }
476 ret = tlmi_opcode_setting("WmiOpcodePasswordCurrent01", setting->password);
477 if (ret)
478 goto out;
479 ret = tlmi_opcode_setting("WmiOpcodePasswordNew01", new_pwd);
480 if (ret)
481 goto out;
482 ret = tlmi_simple_call(LENOVO_OPCODE_IF_GUID, "WmiOpcodePasswordSetUpdate;");
483 } else {
484 /* Format: 'PasswordType,CurrentPw,NewPw,Encoding,KbdLang;' */
485 auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s,%s,%s;",
486 setting->pwd_type, setting->password, new_pwd,
487 encoding_options[setting->encoding], setting->kbdlang);
488 if (!auth_str) {
489 ret = -ENOMEM;
490 goto out;
491 }
492 ret = tlmi_simple_call(LENOVO_SET_BIOS_PASSWORD_GUID, auth_str);
493 kfree(auth_str);
494 }
495out:
496 kfree(new_pwd);
497 return ret ?: count;
498}
499
500static struct kobj_attribute auth_new_password = __ATTR_WO(new_password);
501
502static ssize_t min_password_length_show(struct kobject *kobj, struct kobj_attribute *attr,
503 char *buf)
504{
505 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
506
507 return sysfs_emit(buf, "%d\n", setting->minlen);
508}
509
510static struct kobj_attribute auth_min_pass_length = __ATTR_RO(min_password_length);
511
512static ssize_t max_password_length_show(struct kobject *kobj, struct kobj_attribute *attr,
513 char *buf)
514{
515 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
516
517 return sysfs_emit(buf, "%d\n", setting->maxlen);
518}
519static struct kobj_attribute auth_max_pass_length = __ATTR_RO(max_password_length);
520
521static ssize_t mechanism_show(struct kobject *kobj, struct kobj_attribute *attr,
522 char *buf)
523{
524 return sysfs_emit(buf, "password\n");
525}
526static struct kobj_attribute auth_mechanism = __ATTR_RO(mechanism);
527
528static ssize_t encoding_show(struct kobject *kobj, struct kobj_attribute *attr,
529 char *buf)
530{
531 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
532
533 return sysfs_emit(buf, "%s\n", encoding_options[setting->encoding]);
534}
535
536static ssize_t encoding_store(struct kobject *kobj,
537 struct kobj_attribute *attr,
538 const char *buf, size_t count)
539{
540 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
541 int i;
542
543 /* Scan for a matching profile */
544 i = sysfs_match_string(encoding_options, buf);
545 if (i < 0)
546 return -EINVAL;
547
548 setting->encoding = i;
549 return count;
550}
551
552static struct kobj_attribute auth_encoding = __ATTR_RW(encoding);
553
554static ssize_t kbdlang_show(struct kobject *kobj, struct kobj_attribute *attr,
555 char *buf)
556{
557 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
558
559 return sysfs_emit(buf, "%s\n", setting->kbdlang);
560}
561
562static ssize_t kbdlang_store(struct kobject *kobj,
563 struct kobj_attribute *attr,
564 const char *buf, size_t count)
565{
566 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
567 int length;
568
569 /* Calculate length till '\n' or terminating 0 */
570 length = strchrnul(buf, '\n') - buf;
571 if (!length || length >= TLMI_LANG_MAXLEN)
572 return -EINVAL;
573
574 memcpy(setting->kbdlang, buf, length);
575 setting->kbdlang[length] = '\0';
576 return count;
577}
578
579static struct kobj_attribute auth_kbdlang = __ATTR_RW(kbdlang);
580
581static ssize_t role_show(struct kobject *kobj, struct kobj_attribute *attr,
582 char *buf)
583{
584 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
585
586 return sysfs_emit(buf, "%s\n", setting->role);
587}
588static struct kobj_attribute auth_role = __ATTR_RO(role);
589
590static ssize_t index_show(struct kobject *kobj, struct kobj_attribute *attr,
591 char *buf)
592{
593 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
594
595 return sysfs_emit(buf, "%d\n", setting->index);
596}
597
598static ssize_t index_store(struct kobject *kobj,
599 struct kobj_attribute *attr,
600 const char *buf, size_t count)
601{
602 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
603 int err, val;
604
605 err = kstrtoint(buf, 10, &val);
606 if (err < 0)
607 return err;
608
609 if (val < 0 || val > TLMI_INDEX_MAX)
610 return -EINVAL;
611
612 setting->index = val;
613 return count;
614}
615
616static struct kobj_attribute auth_index = __ATTR_RW(index);
617
618static ssize_t level_show(struct kobject *kobj, struct kobj_attribute *attr,
619 char *buf)
620{
621 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
622
623 return sysfs_emit(buf, "%s\n", level_options[setting->level]);
624}
625
626static ssize_t level_store(struct kobject *kobj,
627 struct kobj_attribute *attr,
628 const char *buf, size_t count)
629{
630 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
631 int i;
632
633 /* Scan for a matching profile */
634 i = sysfs_match_string(level_options, buf);
635 if (i < 0)
636 return -EINVAL;
637
638 setting->level = i;
639 return count;
640}
641
642static struct kobj_attribute auth_level = __ATTR_RW(level);
643
644static ssize_t cert_thumbprint(char *buf, const char *arg, int count)
645{
646 const struct acpi_buffer input = { strlen(arg), (char *)arg };
647 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
648 const union acpi_object *obj;
649 acpi_status status;
650
651 status = wmi_evaluate_method(LENOVO_CERT_THUMBPRINT_GUID, 0, 0, &input, &output);
652 if (ACPI_FAILURE(status)) {
653 kfree(output.pointer);
654 return -EIO;
655 }
656 obj = output.pointer;
657 if (!obj)
658 return -ENOMEM;
659 if (obj->type != ACPI_TYPE_STRING || !obj->string.pointer) {
660 kfree(output.pointer);
661 return -EIO;
662 }
663 count += sysfs_emit_at(buf, count, "%s : %s\n", arg, (char *)obj->string.pointer);
664 kfree(output.pointer);
665
666 return count;
667}
668
669static ssize_t certificate_thumbprint_show(struct kobject *kobj, struct kobj_attribute *attr,
670 char *buf)
671{
672 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
673 int count = 0;
674
675 if (!tlmi_priv.certificate_support || !setting->cert_installed)
676 return -EOPNOTSUPP;
677
678 count += cert_thumbprint(buf, "Md5", count);
679 count += cert_thumbprint(buf, "Sha1", count);
680 count += cert_thumbprint(buf, "Sha256", count);
681 return count;
682}
683
684static struct kobj_attribute auth_cert_thumb = __ATTR_RO(certificate_thumbprint);
685
686static ssize_t cert_to_password_store(struct kobject *kobj,
687 struct kobj_attribute *attr,
688 const char *buf, size_t count)
689{
690 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
691 char *auth_str, *passwd;
692 int ret;
693
694 if (!capable(CAP_SYS_ADMIN))
695 return -EPERM;
696
697 if (!tlmi_priv.certificate_support)
698 return -EOPNOTSUPP;
699
700 if (!setting->cert_installed)
701 return -EINVAL;
702
703 if (!setting->signature || !setting->signature[0])
704 return -EACCES;
705
706 passwd = kstrdup(buf, GFP_KERNEL);
707 if (!passwd)
708 return -ENOMEM;
709
710 /* Strip out CR if one is present */
711 strip_cr(passwd);
712
713 /* Format: 'Password,Signature' */
714 auth_str = kasprintf(GFP_KERNEL, "%s,%s", passwd, setting->signature);
715 if (!auth_str) {
716 kfree(passwd);
717 return -ENOMEM;
718 }
719 ret = tlmi_simple_call(LENOVO_CERT_TO_PASSWORD_GUID, auth_str);
720 kfree(auth_str);
721 kfree(passwd);
722
723 return ret ?: count;
724}
725
726static struct kobj_attribute auth_cert_to_password = __ATTR_WO(cert_to_password);
727
728static ssize_t certificate_store(struct kobject *kobj,
729 struct kobj_attribute *attr,
730 const char *buf, size_t count)
731{
732 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
733 char *auth_str, *new_cert;
734 char *guid;
735 int ret;
736
737 if (!capable(CAP_SYS_ADMIN))
738 return -EPERM;
739
740 if (!tlmi_priv.certificate_support)
741 return -EOPNOTSUPP;
742
743 /* If empty then clear installed certificate */
744 if ((buf[0] == '\0') || (buf[0] == '\n')) { /* Clear installed certificate */
745 /* Check that signature is set */
746 if (!setting->signature || !setting->signature[0])
747 return -EACCES;
748
749 /* Format: 'serial#, signature' */
750 auth_str = kasprintf(GFP_KERNEL, "%s,%s",
751 dmi_get_system_info(DMI_PRODUCT_SERIAL),
752 setting->signature);
753 if (!auth_str)
754 return -ENOMEM;
755
756 ret = tlmi_simple_call(LENOVO_CLEAR_BIOS_CERT_GUID, auth_str);
757 kfree(auth_str);
758
759 return ret ?: count;
760 }
761
762 new_cert = kstrdup(buf, GFP_KERNEL);
763 if (!new_cert)
764 return -ENOMEM;
765 /* Strip out CR if one is present */
766 strip_cr(new_cert);
767
768 if (setting->cert_installed) {
769 /* Certificate is installed so this is an update */
770 if (!setting->signature || !setting->signature[0]) {
771 kfree(new_cert);
772 return -EACCES;
773 }
774 guid = LENOVO_UPDATE_BIOS_CERT_GUID;
775 /* Format: 'Certificate,Signature' */
776 auth_str = kasprintf(GFP_KERNEL, "%s,%s",
777 new_cert, setting->signature);
778 } else {
779 /* This is a fresh install */
780 if (!setting->valid || !setting->password[0]) {
781 kfree(new_cert);
782 return -EACCES;
783 }
784 guid = LENOVO_SET_BIOS_CERT_GUID;
785 /* Format: 'Certificate,Admin-password' */
786 auth_str = kasprintf(GFP_KERNEL, "%s,%s",
787 new_cert, setting->password);
788 }
789 kfree(new_cert);
790 if (!auth_str)
791 return -ENOMEM;
792
793 ret = tlmi_simple_call(guid, auth_str);
794 kfree(auth_str);
795
796 return ret ?: count;
797}
798
799static struct kobj_attribute auth_certificate = __ATTR_WO(certificate);
800
801static ssize_t signature_store(struct kobject *kobj,
802 struct kobj_attribute *attr,
803 const char *buf, size_t count)
804{
805 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
806 char *new_signature;
807
808 if (!capable(CAP_SYS_ADMIN))
809 return -EPERM;
810
811 if (!tlmi_priv.certificate_support)
812 return -EOPNOTSUPP;
813
814 new_signature = kstrdup(buf, GFP_KERNEL);
815 if (!new_signature)
816 return -ENOMEM;
817
818 /* Strip out CR if one is present */
819 strip_cr(new_signature);
820
821 /* Free any previous signature */
822 kfree(setting->signature);
823 setting->signature = new_signature;
824
825 return count;
826}
827
828static struct kobj_attribute auth_signature = __ATTR_WO(signature);
829
830static ssize_t save_signature_store(struct kobject *kobj,
831 struct kobj_attribute *attr,
832 const char *buf, size_t count)
833{
834 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
835 char *new_signature;
836
837 if (!capable(CAP_SYS_ADMIN))
838 return -EPERM;
839
840 if (!tlmi_priv.certificate_support)
841 return -EOPNOTSUPP;
842
843 new_signature = kstrdup(buf, GFP_KERNEL);
844 if (!new_signature)
845 return -ENOMEM;
846
847 /* Strip out CR if one is present */
848 strip_cr(new_signature);
849
850 /* Free any previous signature */
851 kfree(setting->save_signature);
852 setting->save_signature = new_signature;
853
854 return count;
855}
856
857static struct kobj_attribute auth_save_signature = __ATTR_WO(save_signature);
858
859static umode_t auth_attr_is_visible(struct kobject *kobj,
860 struct attribute *attr, int n)
861{
862 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
863
864 /* We only want to display level and index settings on HDD/NVMe */
865 if ((attr == (struct attribute *)&auth_index) ||
866 (attr == (struct attribute *)&auth_level)) {
867 if ((setting == tlmi_priv.pwd_hdd) || (setting == tlmi_priv.pwd_nvme))
868 return attr->mode;
869 return 0;
870 }
871
872 /* We only display certificates on Admin account, if supported */
873 if ((attr == (struct attribute *)&auth_certificate) ||
874 (attr == (struct attribute *)&auth_signature) ||
875 (attr == (struct attribute *)&auth_save_signature) ||
876 (attr == (struct attribute *)&auth_cert_thumb) ||
877 (attr == (struct attribute *)&auth_cert_to_password)) {
878 if ((setting == tlmi_priv.pwd_admin) && tlmi_priv.certificate_support)
879 return attr->mode;
880 return 0;
881 }
882
883 return attr->mode;
884}
885
886static struct attribute *auth_attrs[] = {
887 &auth_is_pass_set.attr,
888 &auth_min_pass_length.attr,
889 &auth_max_pass_length.attr,
890 &auth_current_password.attr,
891 &auth_new_password.attr,
892 &auth_role.attr,
893 &auth_mechanism.attr,
894 &auth_encoding.attr,
895 &auth_kbdlang.attr,
896 &auth_index.attr,
897 &auth_level.attr,
898 &auth_certificate.attr,
899 &auth_signature.attr,
900 &auth_save_signature.attr,
901 &auth_cert_thumb.attr,
902 &auth_cert_to_password.attr,
903 NULL
904};
905
906static const struct attribute_group auth_attr_group = {
907 .is_visible = auth_attr_is_visible,
908 .attrs = auth_attrs,
909};
910
911/* ---- Attributes sysfs --------------------------------------------------------- */
912static ssize_t display_name_show(struct kobject *kobj, struct kobj_attribute *attr,
913 char *buf)
914{
915 struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
916
917 return sysfs_emit(buf, "%s\n", setting->display_name);
918}
919
920static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
921{
922 struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
923 char *item, *value;
924 int ret;
925
926 ret = tlmi_setting(setting->index, &item, LENOVO_BIOS_SETTING_GUID);
927 if (ret)
928 return ret;
929
930 /* validate and split from `item,value` -> `value` */
931 value = strpbrk(item, ",");
932 if (!value || value == item || !strlen(value + 1))
933 return -EINVAL;
934
935 ret = sysfs_emit(buf, "%s\n", value + 1);
936 kfree(item);
937 return ret;
938}
939
940static ssize_t possible_values_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
941{
942 struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
943
944 if (!tlmi_priv.can_get_bios_selections)
945 return -EOPNOTSUPP;
946
947 return sysfs_emit(buf, "%s\n", setting->possible_values);
948}
949
950static ssize_t current_value_store(struct kobject *kobj,
951 struct kobj_attribute *attr,
952 const char *buf, size_t count)
953{
954 struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
955 char *set_str = NULL, *new_setting = NULL;
956 char *auth_str = NULL;
957 int ret;
958
959 if (!tlmi_priv.can_set_bios_settings)
960 return -EOPNOTSUPP;
961
962 new_setting = kstrdup(buf, GFP_KERNEL);
963 if (!new_setting)
964 return -ENOMEM;
965
966 /* Strip out CR if one is present */
967 strip_cr(new_setting);
968
969 /* Check if certificate authentication is enabled and active */
970 if (tlmi_priv.certificate_support && tlmi_priv.pwd_admin->cert_installed) {
971 if (!tlmi_priv.pwd_admin->signature || !tlmi_priv.pwd_admin->save_signature) {
972 ret = -EINVAL;
973 goto out;
974 }
975 set_str = kasprintf(GFP_KERNEL, "%s,%s,%s", setting->display_name,
976 new_setting, tlmi_priv.pwd_admin->signature);
977 if (!set_str) {
978 ret = -ENOMEM;
979 goto out;
980 }
981
982 ret = tlmi_simple_call(LENOVO_SET_BIOS_SETTING_CERT_GUID, set_str);
983 if (ret)
984 goto out;
985 ret = tlmi_simple_call(LENOVO_SAVE_BIOS_SETTING_CERT_GUID,
986 tlmi_priv.pwd_admin->save_signature);
987 if (ret)
988 goto out;
989 } else { /* Non certiifcate based authentication */
990 if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
991 auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
992 tlmi_priv.pwd_admin->password,
993 encoding_options[tlmi_priv.pwd_admin->encoding],
994 tlmi_priv.pwd_admin->kbdlang);
995 if (!auth_str) {
996 ret = -ENOMEM;
997 goto out;
998 }
999 }
1000
1001 if (auth_str)
1002 set_str = kasprintf(GFP_KERNEL, "%s,%s,%s", setting->display_name,
1003 new_setting, auth_str);
1004 else
1005 set_str = kasprintf(GFP_KERNEL, "%s,%s;", setting->display_name,
1006 new_setting);
1007 if (!set_str) {
1008 ret = -ENOMEM;
1009 goto out;
1010 }
1011
1012 ret = tlmi_simple_call(LENOVO_SET_BIOS_SETTINGS_GUID, set_str);
1013 if (ret)
1014 goto out;
1015
1016 if (auth_str)
1017 ret = tlmi_save_bios_settings(auth_str);
1018 else
1019 ret = tlmi_save_bios_settings("");
1020 }
1021 if (!ret && !tlmi_priv.pending_changes) {
1022 tlmi_priv.pending_changes = true;
1023 /* let userland know it may need to check reboot pending again */
1024 kobject_uevent(&tlmi_priv.class_dev->kobj, KOBJ_CHANGE);
1025 }
1026out:
1027 kfree(auth_str);
1028 kfree(set_str);
1029 kfree(new_setting);
1030 return ret ?: count;
1031}
1032
1033static struct kobj_attribute attr_displ_name = __ATTR_RO(display_name);
1034
1035static struct kobj_attribute attr_possible_values = __ATTR_RO(possible_values);
1036
1037static struct kobj_attribute attr_current_val = __ATTR_RW_MODE(current_value, 0600);
1038
1039static struct attribute *tlmi_attrs[] = {
1040 &attr_displ_name.attr,
1041 &attr_current_val.attr,
1042 &attr_possible_values.attr,
1043 NULL
1044};
1045
1046static const struct attribute_group tlmi_attr_group = {
1047 .attrs = tlmi_attrs,
1048};
1049
1050static ssize_t tlmi_attr_show(struct kobject *kobj, struct attribute *attr,
1051 char *buf)
1052{
1053 struct kobj_attribute *kattr;
1054
1055 kattr = container_of(attr, struct kobj_attribute, attr);
1056 if (kattr->show)
1057 return kattr->show(kobj, kattr, buf);
1058 return -EIO;
1059}
1060
1061static ssize_t tlmi_attr_store(struct kobject *kobj, struct attribute *attr,
1062 const char *buf, size_t count)
1063{
1064 struct kobj_attribute *kattr;
1065
1066 kattr = container_of(attr, struct kobj_attribute, attr);
1067 if (kattr->store)
1068 return kattr->store(kobj, kattr, buf, count);
1069 return -EIO;
1070}
1071
1072static const struct sysfs_ops tlmi_kobj_sysfs_ops = {
1073 .show = tlmi_attr_show,
1074 .store = tlmi_attr_store,
1075};
1076
1077static void tlmi_attr_setting_release(struct kobject *kobj)
1078{
1079 struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
1080
1081 kfree(setting->possible_values);
1082 kfree(setting);
1083}
1084
1085static void tlmi_pwd_setting_release(struct kobject *kobj)
1086{
1087 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
1088
1089 kfree(setting);
1090}
1091
1092static struct kobj_type tlmi_attr_setting_ktype = {
1093 .release = &tlmi_attr_setting_release,
1094 .sysfs_ops = &tlmi_kobj_sysfs_ops,
1095};
1096
1097static struct kobj_type tlmi_pwd_setting_ktype = {
1098 .release = &tlmi_pwd_setting_release,
1099 .sysfs_ops = &tlmi_kobj_sysfs_ops,
1100};
1101
1102static ssize_t pending_reboot_show(struct kobject *kobj, struct kobj_attribute *attr,
1103 char *buf)
1104{
1105 return sprintf(buf, "%d\n", tlmi_priv.pending_changes);
1106}
1107
1108static struct kobj_attribute pending_reboot = __ATTR_RO(pending_reboot);
1109
1110/* ---- Debug interface--------------------------------------------------------- */
1111static ssize_t debug_cmd_store(struct kobject *kobj, struct kobj_attribute *attr,
1112 const char *buf, size_t count)
1113{
1114 char *set_str = NULL, *new_setting = NULL;
1115 char *auth_str = NULL;
1116 int ret;
1117
1118 if (!tlmi_priv.can_debug_cmd)
1119 return -EOPNOTSUPP;
1120
1121 new_setting = kstrdup(buf, GFP_KERNEL);
1122 if (!new_setting)
1123 return -ENOMEM;
1124
1125 /* Strip out CR if one is present */
1126 strip_cr(new_setting);
1127
1128 if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
1129 auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
1130 tlmi_priv.pwd_admin->password,
1131 encoding_options[tlmi_priv.pwd_admin->encoding],
1132 tlmi_priv.pwd_admin->kbdlang);
1133 if (!auth_str) {
1134 ret = -ENOMEM;
1135 goto out;
1136 }
1137 }
1138
1139 if (auth_str)
1140 set_str = kasprintf(GFP_KERNEL, "%s,%s", new_setting, auth_str);
1141 else
1142 set_str = kasprintf(GFP_KERNEL, "%s;", new_setting);
1143 if (!set_str) {
1144 ret = -ENOMEM;
1145 goto out;
1146 }
1147
1148 ret = tlmi_simple_call(LENOVO_DEBUG_CMD_GUID, set_str);
1149 if (ret)
1150 goto out;
1151
1152 if (!ret && !tlmi_priv.pending_changes) {
1153 tlmi_priv.pending_changes = true;
1154 /* let userland know it may need to check reboot pending again */
1155 kobject_uevent(&tlmi_priv.class_dev->kobj, KOBJ_CHANGE);
1156 }
1157out:
1158 kfree(auth_str);
1159 kfree(set_str);
1160 kfree(new_setting);
1161 return ret ?: count;
1162}
1163
1164static struct kobj_attribute debug_cmd = __ATTR_WO(debug_cmd);
1165
1166/* ---- Initialisation --------------------------------------------------------- */
1167static void tlmi_release_attr(void)
1168{
1169 int i;
1170
1171 /* Attribute structures */
1172 for (i = 0; i < TLMI_SETTINGS_COUNT; i++) {
1173 if (tlmi_priv.setting[i]) {
1174 sysfs_remove_group(&tlmi_priv.setting[i]->kobj, &tlmi_attr_group);
1175 kobject_put(&tlmi_priv.setting[i]->kobj);
1176 }
1177 }
1178 sysfs_remove_file(&tlmi_priv.attribute_kset->kobj, &pending_reboot.attr);
1179 if (tlmi_priv.can_debug_cmd && debug_support)
1180 sysfs_remove_file(&tlmi_priv.attribute_kset->kobj, &debug_cmd.attr);
1181
1182 kset_unregister(tlmi_priv.attribute_kset);
1183
1184 /* Free up any saved signatures */
1185 kfree(tlmi_priv.pwd_admin->signature);
1186 kfree(tlmi_priv.pwd_admin->save_signature);
1187
1188 /* Authentication structures */
1189 sysfs_remove_group(&tlmi_priv.pwd_admin->kobj, &auth_attr_group);
1190 kobject_put(&tlmi_priv.pwd_admin->kobj);
1191 sysfs_remove_group(&tlmi_priv.pwd_power->kobj, &auth_attr_group);
1192 kobject_put(&tlmi_priv.pwd_power->kobj);
1193
1194 if (tlmi_priv.opcode_support) {
1195 sysfs_remove_group(&tlmi_priv.pwd_system->kobj, &auth_attr_group);
1196 kobject_put(&tlmi_priv.pwd_system->kobj);
1197 sysfs_remove_group(&tlmi_priv.pwd_hdd->kobj, &auth_attr_group);
1198 kobject_put(&tlmi_priv.pwd_hdd->kobj);
1199 sysfs_remove_group(&tlmi_priv.pwd_nvme->kobj, &auth_attr_group);
1200 kobject_put(&tlmi_priv.pwd_nvme->kobj);
1201 }
1202
1203 kset_unregister(tlmi_priv.authentication_kset);
1204}
1205
1206static int tlmi_sysfs_init(void)
1207{
1208 int i, ret;
1209
1210 ret = fw_attributes_class_get(&fw_attr_class);
1211 if (ret)
1212 return ret;
1213
1214 tlmi_priv.class_dev = device_create(fw_attr_class, NULL, MKDEV(0, 0),
1215 NULL, "%s", "thinklmi");
1216 if (IS_ERR(tlmi_priv.class_dev)) {
1217 ret = PTR_ERR(tlmi_priv.class_dev);
1218 goto fail_class_created;
1219 }
1220
1221 tlmi_priv.attribute_kset = kset_create_and_add("attributes", NULL,
1222 &tlmi_priv.class_dev->kobj);
1223 if (!tlmi_priv.attribute_kset) {
1224 ret = -ENOMEM;
1225 goto fail_device_created;
1226 }
1227
1228 for (i = 0; i < TLMI_SETTINGS_COUNT; i++) {
1229 /* Check if index is a valid setting - skip if it isn't */
1230 if (!tlmi_priv.setting[i])
1231 continue;
1232
1233 /* check for duplicate or reserved values */
1234 if (kset_find_obj(tlmi_priv.attribute_kset, tlmi_priv.setting[i]->display_name) ||
1235 !strcmp(tlmi_priv.setting[i]->display_name, "Reserved")) {
1236 pr_debug("duplicate or reserved attribute name found - %s\n",
1237 tlmi_priv.setting[i]->display_name);
1238 kfree(tlmi_priv.setting[i]->possible_values);
1239 kfree(tlmi_priv.setting[i]);
1240 tlmi_priv.setting[i] = NULL;
1241 continue;
1242 }
1243
1244 /* Build attribute */
1245 tlmi_priv.setting[i]->kobj.kset = tlmi_priv.attribute_kset;
1246 ret = kobject_add(&tlmi_priv.setting[i]->kobj, NULL,
1247 "%s", tlmi_priv.setting[i]->display_name);
1248 if (ret)
1249 goto fail_create_attr;
1250
1251 ret = sysfs_create_group(&tlmi_priv.setting[i]->kobj, &tlmi_attr_group);
1252 if (ret)
1253 goto fail_create_attr;
1254 }
1255
1256 ret = sysfs_create_file(&tlmi_priv.attribute_kset->kobj, &pending_reboot.attr);
1257 if (ret)
1258 goto fail_create_attr;
1259
1260 if (tlmi_priv.can_debug_cmd && debug_support) {
1261 ret = sysfs_create_file(&tlmi_priv.attribute_kset->kobj, &debug_cmd.attr);
1262 if (ret)
1263 goto fail_create_attr;
1264 }
1265
1266 /* Create authentication entries */
1267 tlmi_priv.authentication_kset = kset_create_and_add("authentication", NULL,
1268 &tlmi_priv.class_dev->kobj);
1269 if (!tlmi_priv.authentication_kset) {
1270 ret = -ENOMEM;
1271 goto fail_create_attr;
1272 }
1273 tlmi_priv.pwd_admin->kobj.kset = tlmi_priv.authentication_kset;
1274 ret = kobject_add(&tlmi_priv.pwd_admin->kobj, NULL, "%s", "Admin");
1275 if (ret)
1276 goto fail_create_attr;
1277
1278 ret = sysfs_create_group(&tlmi_priv.pwd_admin->kobj, &auth_attr_group);
1279 if (ret)
1280 goto fail_create_attr;
1281
1282 tlmi_priv.pwd_power->kobj.kset = tlmi_priv.authentication_kset;
1283 ret = kobject_add(&tlmi_priv.pwd_power->kobj, NULL, "%s", "Power-on");
1284 if (ret)
1285 goto fail_create_attr;
1286
1287 ret = sysfs_create_group(&tlmi_priv.pwd_power->kobj, &auth_attr_group);
1288 if (ret)
1289 goto fail_create_attr;
1290
1291 if (tlmi_priv.opcode_support) {
1292 tlmi_priv.pwd_system->kobj.kset = tlmi_priv.authentication_kset;
1293 ret = kobject_add(&tlmi_priv.pwd_system->kobj, NULL, "%s", "System");
1294 if (ret)
1295 goto fail_create_attr;
1296
1297 ret = sysfs_create_group(&tlmi_priv.pwd_system->kobj, &auth_attr_group);
1298 if (ret)
1299 goto fail_create_attr;
1300
1301 tlmi_priv.pwd_hdd->kobj.kset = tlmi_priv.authentication_kset;
1302 ret = kobject_add(&tlmi_priv.pwd_hdd->kobj, NULL, "%s", "HDD");
1303 if (ret)
1304 goto fail_create_attr;
1305
1306 ret = sysfs_create_group(&tlmi_priv.pwd_hdd->kobj, &auth_attr_group);
1307 if (ret)
1308 goto fail_create_attr;
1309
1310 tlmi_priv.pwd_nvme->kobj.kset = tlmi_priv.authentication_kset;
1311 ret = kobject_add(&tlmi_priv.pwd_nvme->kobj, NULL, "%s", "NVMe");
1312 if (ret)
1313 goto fail_create_attr;
1314
1315 ret = sysfs_create_group(&tlmi_priv.pwd_nvme->kobj, &auth_attr_group);
1316 if (ret)
1317 goto fail_create_attr;
1318 }
1319
1320 return ret;
1321
1322fail_create_attr:
1323 tlmi_release_attr();
1324fail_device_created:
1325 device_destroy(fw_attr_class, MKDEV(0, 0));
1326fail_class_created:
1327 fw_attributes_class_put();
1328 return ret;
1329}
1330
1331/* ---- Base Driver -------------------------------------------------------- */
1332static struct tlmi_pwd_setting *tlmi_create_auth(const char *pwd_type,
1333 const char *pwd_role)
1334{
1335 struct tlmi_pwd_setting *new_pwd;
1336
1337 new_pwd = kzalloc(sizeof(struct tlmi_pwd_setting), GFP_KERNEL);
1338 if (!new_pwd)
1339 return NULL;
1340
1341 strscpy(new_pwd->kbdlang, "us", TLMI_LANG_MAXLEN);
1342 new_pwd->encoding = TLMI_ENCODING_ASCII;
1343 new_pwd->pwd_type = pwd_type;
1344 new_pwd->role = pwd_role;
1345 new_pwd->minlen = tlmi_priv.pwdcfg.core.min_length;
1346 new_pwd->maxlen = tlmi_priv.pwdcfg.core.max_length;
1347 new_pwd->index = 0;
1348
1349 kobject_init(&new_pwd->kobj, &tlmi_pwd_setting_ktype);
1350
1351 return new_pwd;
1352}
1353
1354static int tlmi_analyze(void)
1355{
1356 acpi_status status;
1357 int i, ret;
1358
1359 if (wmi_has_guid(LENOVO_SET_BIOS_SETTINGS_GUID) &&
1360 wmi_has_guid(LENOVO_SAVE_BIOS_SETTINGS_GUID))
1361 tlmi_priv.can_set_bios_settings = true;
1362
1363 if (wmi_has_guid(LENOVO_GET_BIOS_SELECTIONS_GUID))
1364 tlmi_priv.can_get_bios_selections = true;
1365
1366 if (wmi_has_guid(LENOVO_SET_BIOS_PASSWORD_GUID))
1367 tlmi_priv.can_set_bios_password = true;
1368
1369 if (wmi_has_guid(LENOVO_BIOS_PASSWORD_SETTINGS_GUID))
1370 tlmi_priv.can_get_password_settings = true;
1371
1372 if (wmi_has_guid(LENOVO_DEBUG_CMD_GUID))
1373 tlmi_priv.can_debug_cmd = true;
1374
1375 if (wmi_has_guid(LENOVO_OPCODE_IF_GUID))
1376 tlmi_priv.opcode_support = true;
1377
1378 if (wmi_has_guid(LENOVO_SET_BIOS_CERT_GUID) &&
1379 wmi_has_guid(LENOVO_SET_BIOS_SETTING_CERT_GUID) &&
1380 wmi_has_guid(LENOVO_SAVE_BIOS_SETTING_CERT_GUID))
1381 tlmi_priv.certificate_support = true;
1382
1383 /*
1384 * Try to find the number of valid settings of this machine
1385 * and use it to create sysfs attributes.
1386 */
1387 for (i = 0; i < TLMI_SETTINGS_COUNT; ++i) {
1388 struct tlmi_attr_setting *setting;
1389 char *item = NULL;
1390 char *p;
1391
1392 tlmi_priv.setting[i] = NULL;
1393 status = tlmi_setting(i, &item, LENOVO_BIOS_SETTING_GUID);
1394 if (ACPI_FAILURE(status))
1395 break;
1396 if (!item)
1397 break;
1398 if (!*item) {
1399 kfree(item);
1400 continue;
1401 }
1402
1403 /* It is not allowed to have '/' for file name. Convert it into '\'. */
1404 strreplace(item, '/', '\\');
1405
1406 /* Remove the value part */
1407 p = strchrnul(item, ',');
1408 *p = '\0';
1409
1410 /* Create a setting entry */
1411 setting = kzalloc(sizeof(*setting), GFP_KERNEL);
1412 if (!setting) {
1413 ret = -ENOMEM;
1414 kfree(item);
1415 goto fail_clear_attr;
1416 }
1417 setting->index = i;
1418 strscpy(setting->display_name, item, TLMI_SETTINGS_MAXLEN);
1419 /* If BIOS selections supported, load those */
1420 if (tlmi_priv.can_get_bios_selections) {
1421 ret = tlmi_get_bios_selections(setting->display_name,
1422 &setting->possible_values);
1423 if (ret || !setting->possible_values)
1424 pr_info("Error retrieving possible values for %d : %s\n",
1425 i, setting->display_name);
1426 }
1427 kobject_init(&setting->kobj, &tlmi_attr_setting_ktype);
1428 tlmi_priv.setting[i] = setting;
1429 kfree(item);
1430 }
1431
1432 /* Create password setting structure */
1433 ret = tlmi_get_pwd_settings(&tlmi_priv.pwdcfg);
1434 if (ret)
1435 goto fail_clear_attr;
1436
1437 /* All failures below boil down to kmalloc failures */
1438 ret = -ENOMEM;
1439
1440 tlmi_priv.pwd_admin = tlmi_create_auth("pap", "bios-admin");
1441 if (!tlmi_priv.pwd_admin)
1442 goto fail_clear_attr;
1443
1444 if (tlmi_priv.pwdcfg.core.password_state & TLMI_PAP_PWD)
1445 tlmi_priv.pwd_admin->valid = true;
1446
1447 tlmi_priv.pwd_power = tlmi_create_auth("pop", "power-on");
1448 if (!tlmi_priv.pwd_power)
1449 goto fail_clear_attr;
1450
1451 if (tlmi_priv.pwdcfg.core.password_state & TLMI_POP_PWD)
1452 tlmi_priv.pwd_power->valid = true;
1453
1454 if (tlmi_priv.opcode_support) {
1455 tlmi_priv.pwd_system = tlmi_create_auth("sys", "system");
1456 if (!tlmi_priv.pwd_system)
1457 goto fail_clear_attr;
1458
1459 if (tlmi_priv.pwdcfg.core.password_state & TLMI_SYS_PWD)
1460 tlmi_priv.pwd_system->valid = true;
1461
1462 tlmi_priv.pwd_hdd = tlmi_create_auth("hdd", "hdd");
1463 if (!tlmi_priv.pwd_hdd)
1464 goto fail_clear_attr;
1465
1466 tlmi_priv.pwd_nvme = tlmi_create_auth("nvm", "nvme");
1467 if (!tlmi_priv.pwd_nvme)
1468 goto fail_clear_attr;
1469
1470 if (tlmi_priv.pwdcfg.core.password_state & TLMI_HDD_PWD) {
1471 /* Check if PWD is configured and set index to first drive found */
1472 if (tlmi_priv.pwdcfg.ext.hdd_user_password ||
1473 tlmi_priv.pwdcfg.ext.hdd_master_password) {
1474 tlmi_priv.pwd_hdd->valid = true;
1475 if (tlmi_priv.pwdcfg.ext.hdd_master_password)
1476 tlmi_priv.pwd_hdd->index =
1477 ffs(tlmi_priv.pwdcfg.ext.hdd_master_password) - 1;
1478 else
1479 tlmi_priv.pwd_hdd->index =
1480 ffs(tlmi_priv.pwdcfg.ext.hdd_user_password) - 1;
1481 }
1482 if (tlmi_priv.pwdcfg.ext.nvme_user_password ||
1483 tlmi_priv.pwdcfg.ext.nvme_master_password) {
1484 tlmi_priv.pwd_nvme->valid = true;
1485 if (tlmi_priv.pwdcfg.ext.nvme_master_password)
1486 tlmi_priv.pwd_nvme->index =
1487 ffs(tlmi_priv.pwdcfg.ext.nvme_master_password) - 1;
1488 else
1489 tlmi_priv.pwd_nvme->index =
1490 ffs(tlmi_priv.pwdcfg.ext.nvme_user_password) - 1;
1491 }
1492 }
1493 }
1494
1495 if (tlmi_priv.certificate_support &&
1496 (tlmi_priv.pwdcfg.core.password_state & TLMI_CERT))
1497 tlmi_priv.pwd_admin->cert_installed = true;
1498
1499 return 0;
1500
1501fail_clear_attr:
1502 for (i = 0; i < TLMI_SETTINGS_COUNT; ++i) {
1503 if (tlmi_priv.setting[i]) {
1504 kfree(tlmi_priv.setting[i]->possible_values);
1505 kfree(tlmi_priv.setting[i]);
1506 }
1507 }
1508 kfree(tlmi_priv.pwd_admin);
1509 kfree(tlmi_priv.pwd_power);
1510 kfree(tlmi_priv.pwd_system);
1511 kfree(tlmi_priv.pwd_hdd);
1512 kfree(tlmi_priv.pwd_nvme);
1513 return ret;
1514}
1515
1516static void tlmi_remove(struct wmi_device *wdev)
1517{
1518 tlmi_release_attr();
1519 device_destroy(fw_attr_class, MKDEV(0, 0));
1520 fw_attributes_class_put();
1521}
1522
1523static int tlmi_probe(struct wmi_device *wdev, const void *context)
1524{
1525 int ret;
1526
1527 ret = tlmi_analyze();
1528 if (ret)
1529 return ret;
1530
1531 return tlmi_sysfs_init();
1532}
1533
1534static const struct wmi_device_id tlmi_id_table[] = {
1535 { .guid_string = LENOVO_BIOS_SETTING_GUID },
1536 { }
1537};
1538MODULE_DEVICE_TABLE(wmi, tlmi_id_table);
1539
1540static struct wmi_driver tlmi_driver = {
1541 .driver = {
1542 .name = "think-lmi",
1543 },
1544 .id_table = tlmi_id_table,
1545 .probe = tlmi_probe,
1546 .remove = tlmi_remove,
1547};
1548
1549MODULE_AUTHOR("Sugumaran L <slacshiminar@lenovo.com>");
1550MODULE_AUTHOR("Mark Pearson <markpearson@lenovo.com>");
1551MODULE_AUTHOR("Corentin Chary <corentin.chary@gmail.com>");
1552MODULE_DESCRIPTION("ThinkLMI Driver");
1553MODULE_LICENSE("GPL");
1554
1555module_wmi_driver(tlmi_driver);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Think LMI BIOS configuration driver
4 *
5 * Copyright(C) 2019-2021 Lenovo
6 *
7 * Original code from Thinkpad-wmi project https://github.com/iksaif/thinkpad-wmi
8 * Copyright(C) 2017 Corentin Chary <corentin.chary@gmail.com>
9 * Distributed under the GPL-2.0 license
10 */
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/acpi.h>
15#include <linux/errno.h>
16#include <linux/fs.h>
17#include <linux/mutex.h>
18#include <linux/string_helpers.h>
19#include <linux/types.h>
20#include <linux/dmi.h>
21#include <linux/wmi.h>
22#include "firmware_attributes_class.h"
23#include "think-lmi.h"
24
25static bool debug_support;
26module_param(debug_support, bool, 0444);
27MODULE_PARM_DESC(debug_support, "Enable debug command support");
28
29/*
30 * Name: BiosSetting
31 * Description: Get item name and settings for current LMI instance.
32 * Type: Query
33 * Returns: "Item,Value"
34 * Example: "WakeOnLAN,Enable"
35 */
36#define LENOVO_BIOS_SETTING_GUID "51F5230E-9677-46CD-A1CF-C0B23EE34DB7"
37
38/*
39 * Name: SetBiosSetting
40 * Description: Change the BIOS setting to the desired value using the SetBiosSetting
41 * class. To save the settings, use the SaveBiosSetting class.
42 * BIOS settings and values are case sensitive.
43 * After making changes to the BIOS settings, you must reboot the computer
44 * before the changes will take effect.
45 * Type: Method
46 * Arguments: "Item,Value,Password,Encoding,KbdLang;"
47 * Example: "WakeOnLAN,Disable,pa55w0rd,ascii,us;"
48 */
49#define LENOVO_SET_BIOS_SETTINGS_GUID "98479A64-33F5-4E33-A707-8E251EBBC3A1"
50
51/*
52 * Name: SaveBiosSettings
53 * Description: Save any pending changes in settings.
54 * Type: Method
55 * Arguments: "Password,Encoding,KbdLang;"
56 * Example: "pa55w0rd,ascii,us;"
57 */
58#define LENOVO_SAVE_BIOS_SETTINGS_GUID "6A4B54EF-A5ED-4D33-9455-B0D9B48DF4B3"
59
60/*
61 * Name: BiosPasswordSettings
62 * Description: Return BIOS Password settings
63 * Type: Query
64 * Returns: PasswordMode, PasswordState, MinLength, MaxLength,
65 * SupportedEncoding, SupportedKeyboard
66 */
67#define LENOVO_BIOS_PASSWORD_SETTINGS_GUID "8ADB159E-1E32-455C-BC93-308A7ED98246"
68
69/*
70 * Name: SetBiosPassword
71 * Description: Change a specific password.
72 * - BIOS settings cannot be changed at the same boot as power-on
73 * passwords (POP) and hard disk passwords (HDP). If you want to change
74 * BIOS settings and POP or HDP, you must reboot the system after changing
75 * one of them.
76 * - A password cannot be set using this method when one does not already
77 * exist. Passwords can only be updated or cleared.
78 * Type: Method
79 * Arguments: "PasswordType,CurrentPassword,NewPassword,Encoding,KbdLang;"
80 * Example: "pop,pa55w0rd,newpa55w0rd,ascii,us;”
81 */
82#define LENOVO_SET_BIOS_PASSWORD_GUID "2651D9FD-911C-4B69-B94E-D0DED5963BD7"
83
84/*
85 * Name: GetBiosSelections
86 * Description: Return a list of valid settings for a given item.
87 * Type: Method
88 * Arguments: "Item"
89 * Returns: "Value1,Value2,Value3,..."
90 * Example:
91 * -> "FlashOverLAN"
92 * <- "Enabled,Disabled"
93 */
94#define LENOVO_GET_BIOS_SELECTIONS_GUID "7364651A-132F-4FE7-ADAA-40C6C7EE2E3B"
95
96/*
97 * Name: DebugCmd
98 * Description: Debug entry method for entering debug commands to the BIOS
99 */
100#define LENOVO_DEBUG_CMD_GUID "7FF47003-3B6C-4E5E-A227-E979824A85D1"
101
102/*
103 * Name: OpcodeIF
104 * Description: Opcode interface which provides the ability to set multiple
105 * parameters and then trigger an action with a final command.
106 * This is particularly useful for simplifying setting passwords.
107 * With this support comes the ability to set System, HDD and NVMe
108 * passwords.
109 * This is currently available on ThinkCenter and ThinkStations platforms
110 */
111#define LENOVO_OPCODE_IF_GUID "DFDDEF2C-57D4-48ce-B196-0FB787D90836"
112
113/*
114 * Name: SetBiosCert
115 * Description: Install BIOS certificate.
116 * Type: Method
117 * Arguments: "Certificate,Password"
118 * You must reboot the computer before the changes will take effect.
119 */
120#define LENOVO_SET_BIOS_CERT_GUID "26861C9F-47E9-44C4-BD8B-DFE7FA2610FE"
121
122/*
123 * Name: UpdateBiosCert
124 * Description: Update BIOS certificate.
125 * Type: Method
126 * Format: "Certificate,Signature"
127 * You must reboot the computer before the changes will take effect.
128 */
129#define LENOVO_UPDATE_BIOS_CERT_GUID "9AA3180A-9750-41F7-B9F7-D5D3B1BAC3CE"
130
131/*
132 * Name: ClearBiosCert
133 * Description: Uninstall BIOS certificate.
134 * Type: Method
135 * Format: "Serial,Signature"
136 * You must reboot the computer before the changes will take effect.
137 */
138#define LENOVO_CLEAR_BIOS_CERT_GUID "B2BC39A7-78DD-4D71-B059-A510DEC44890"
139/*
140 * Name: CertToPassword
141 * Description: Switch from certificate to password authentication.
142 * Type: Method
143 * Format: "Password,Signature"
144 * You must reboot the computer before the changes will take effect.
145 */
146#define LENOVO_CERT_TO_PASSWORD_GUID "0DE8590D-5510-4044-9621-77C227F5A70D"
147
148/*
149 * Name: SetBiosSettingCert
150 * Description: Set attribute using certificate authentication.
151 * Type: Method
152 * Format: "Item,Value,Signature"
153 */
154#define LENOVO_SET_BIOS_SETTING_CERT_GUID "34A008CC-D205-4B62-9E67-31DFA8B90003"
155
156/*
157 * Name: SaveBiosSettingCert
158 * Description: Save any pending changes in settings.
159 * Type: Method
160 * Format: "Signature"
161 */
162#define LENOVO_SAVE_BIOS_SETTING_CERT_GUID "C050FB9D-DF5F-4606-B066-9EFC401B2551"
163
164/*
165 * Name: CertThumbprint
166 * Description: Display Certificate thumbprints
167 * Type: Query
168 * Returns: MD5, SHA1 & SHA256 thumbprints
169 */
170#define LENOVO_CERT_THUMBPRINT_GUID "C59119ED-1C0D-4806-A8E9-59AA318176C4"
171
172#define TLMI_POP_PWD BIT(0) /* Supervisor */
173#define TLMI_PAP_PWD BIT(1) /* Power-on */
174#define TLMI_HDD_PWD BIT(2) /* HDD/NVME */
175#define TLMI_SMP_PWD BIT(6) /* System Management */
176#define TLMI_CERT BIT(7) /* Certificate Based */
177
178#define to_tlmi_pwd_setting(kobj) container_of(kobj, struct tlmi_pwd_setting, kobj)
179#define to_tlmi_attr_setting(kobj) container_of(kobj, struct tlmi_attr_setting, kobj)
180
181static const struct tlmi_err_codes tlmi_errs[] = {
182 {"Success", 0},
183 {"Not Supported", -EOPNOTSUPP},
184 {"Invalid Parameter", -EINVAL},
185 {"Access Denied", -EACCES},
186 {"System Busy", -EBUSY},
187};
188
189static const char * const encoding_options[] = {
190 [TLMI_ENCODING_ASCII] = "ascii",
191 [TLMI_ENCODING_SCANCODE] = "scancode",
192};
193static const char * const level_options[] = {
194 [TLMI_LEVEL_USER] = "user",
195 [TLMI_LEVEL_MASTER] = "master",
196};
197static struct think_lmi tlmi_priv;
198static const struct class *fw_attr_class;
199static DEFINE_MUTEX(tlmi_mutex);
200
201/* Convert BIOS WMI error string to suitable error code */
202static int tlmi_errstr_to_err(const char *errstr)
203{
204 int i;
205
206 for (i = 0; i < sizeof(tlmi_errs)/sizeof(struct tlmi_err_codes); i++) {
207 if (!strcmp(tlmi_errs[i].err_str, errstr))
208 return tlmi_errs[i].err_code;
209 }
210 return -EPERM;
211}
212
213/* Extract error string from WMI return buffer */
214static int tlmi_extract_error(const struct acpi_buffer *output)
215{
216 const union acpi_object *obj;
217
218 obj = output->pointer;
219 if (!obj)
220 return -ENOMEM;
221 if (obj->type != ACPI_TYPE_STRING || !obj->string.pointer)
222 return -EIO;
223
224 return tlmi_errstr_to_err(obj->string.pointer);
225}
226
227/* Utility function to execute WMI call to BIOS */
228static int tlmi_simple_call(const char *guid, const char *arg)
229{
230 const struct acpi_buffer input = { strlen(arg), (char *)arg };
231 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
232 acpi_status status;
233 int i, err;
234
235 /*
236 * Duplicated call required to match BIOS workaround for behavior
237 * seen when WMI accessed via scripting on other OS.
238 */
239 for (i = 0; i < 2; i++) {
240 /* (re)initialize output buffer to default state */
241 output.length = ACPI_ALLOCATE_BUFFER;
242 output.pointer = NULL;
243
244 status = wmi_evaluate_method(guid, 0, 0, &input, &output);
245 if (ACPI_FAILURE(status)) {
246 kfree(output.pointer);
247 return -EIO;
248 }
249 err = tlmi_extract_error(&output);
250 kfree(output.pointer);
251 if (err)
252 return err;
253 }
254 return 0;
255}
256
257/* Extract output string from WMI return buffer */
258static int tlmi_extract_output_string(const struct acpi_buffer *output,
259 char **string)
260{
261 const union acpi_object *obj;
262 char *s;
263
264 obj = output->pointer;
265 if (!obj)
266 return -ENOMEM;
267 if (obj->type != ACPI_TYPE_STRING || !obj->string.pointer)
268 return -EIO;
269
270 s = kstrdup(obj->string.pointer, GFP_KERNEL);
271 if (!s)
272 return -ENOMEM;
273 *string = s;
274 return 0;
275}
276
277/* ------ Core interface functions ------------*/
278
279/* Get password settings from BIOS */
280static int tlmi_get_pwd_settings(struct tlmi_pwdcfg *pwdcfg)
281{
282 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
283 const union acpi_object *obj;
284 acpi_status status;
285 int copy_size;
286
287 if (!tlmi_priv.can_get_password_settings)
288 return -EOPNOTSUPP;
289
290 status = wmi_query_block(LENOVO_BIOS_PASSWORD_SETTINGS_GUID, 0,
291 &output);
292 if (ACPI_FAILURE(status))
293 return -EIO;
294
295 obj = output.pointer;
296 if (!obj)
297 return -ENOMEM;
298 if (obj->type != ACPI_TYPE_BUFFER || !obj->buffer.pointer) {
299 kfree(obj);
300 return -EIO;
301 }
302 /*
303 * The size of thinkpad_wmi_pcfg on ThinkStation is larger than ThinkPad.
304 * To make the driver compatible on different brands, we permit it to get
305 * the data in below case.
306 * Settings must have at minimum the core fields available
307 */
308 if (obj->buffer.length < sizeof(struct tlmi_pwdcfg_core)) {
309 pr_warn("Unknown pwdcfg buffer length %d\n", obj->buffer.length);
310 kfree(obj);
311 return -EIO;
312 }
313
314 copy_size = min_t(size_t, obj->buffer.length, sizeof(struct tlmi_pwdcfg));
315
316 memcpy(pwdcfg, obj->buffer.pointer, copy_size);
317 kfree(obj);
318
319 if (WARN_ON(pwdcfg->core.max_length >= TLMI_PWD_BUFSIZE))
320 pwdcfg->core.max_length = TLMI_PWD_BUFSIZE - 1;
321 return 0;
322}
323
324static int tlmi_save_bios_settings(const char *password)
325{
326 return tlmi_simple_call(LENOVO_SAVE_BIOS_SETTINGS_GUID,
327 password);
328}
329
330static int tlmi_opcode_setting(char *setting, const char *value)
331{
332 char *opcode_str;
333 int ret;
334
335 opcode_str = kasprintf(GFP_KERNEL, "%s:%s;", setting, value);
336 if (!opcode_str)
337 return -ENOMEM;
338
339 ret = tlmi_simple_call(LENOVO_OPCODE_IF_GUID, opcode_str);
340 kfree(opcode_str);
341 return ret;
342}
343
344static int tlmi_setting(int item, char **value, const char *guid_string)
345{
346 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
347 acpi_status status;
348 int ret;
349
350 status = wmi_query_block(guid_string, item, &output);
351 if (ACPI_FAILURE(status)) {
352 kfree(output.pointer);
353 return -EIO;
354 }
355
356 ret = tlmi_extract_output_string(&output, value);
357 kfree(output.pointer);
358 return ret;
359}
360
361static int tlmi_get_bios_selections(const char *item, char **value)
362{
363 const struct acpi_buffer input = { strlen(item), (char *)item };
364 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
365 acpi_status status;
366 int ret;
367
368 status = wmi_evaluate_method(LENOVO_GET_BIOS_SELECTIONS_GUID,
369 0, 0, &input, &output);
370
371 if (ACPI_FAILURE(status)) {
372 kfree(output.pointer);
373 return -EIO;
374 }
375
376 ret = tlmi_extract_output_string(&output, value);
377 kfree(output.pointer);
378 return ret;
379}
380
381/* ---- Authentication sysfs --------------------------------------------------------- */
382static ssize_t is_enabled_show(struct kobject *kobj, struct kobj_attribute *attr,
383 char *buf)
384{
385 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
386
387 return sysfs_emit(buf, "%d\n", setting->valid);
388}
389
390static struct kobj_attribute auth_is_pass_set = __ATTR_RO(is_enabled);
391
392static ssize_t current_password_store(struct kobject *kobj,
393 struct kobj_attribute *attr,
394 const char *buf, size_t count)
395{
396 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
397 size_t pwdlen;
398
399 pwdlen = strlen(buf);
400 /* pwdlen == 0 is allowed to clear the password */
401 if (pwdlen && ((pwdlen < setting->minlen) || (pwdlen > setting->maxlen)))
402 return -EINVAL;
403
404 strscpy(setting->password, buf, setting->maxlen);
405 /* Strip out CR if one is present, setting password won't work if it is present */
406 strreplace(setting->password, '\n', '\0');
407 return count;
408}
409
410static struct kobj_attribute auth_current_password = __ATTR_WO(current_password);
411
412static ssize_t new_password_store(struct kobject *kobj,
413 struct kobj_attribute *attr,
414 const char *buf, size_t count)
415{
416 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
417 char *auth_str, *new_pwd;
418 size_t pwdlen;
419 int ret;
420
421 if (!capable(CAP_SYS_ADMIN))
422 return -EPERM;
423
424 if (!tlmi_priv.can_set_bios_password)
425 return -EOPNOTSUPP;
426
427 /* Strip out CR if one is present, setting password won't work if it is present */
428 new_pwd = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
429 if (!new_pwd)
430 return -ENOMEM;
431
432 /* Use lock in case multiple WMI operations needed */
433 mutex_lock(&tlmi_mutex);
434
435 pwdlen = strlen(new_pwd);
436 /* pwdlen == 0 is allowed to clear the password */
437 if (pwdlen && ((pwdlen < setting->minlen) || (pwdlen > setting->maxlen))) {
438 ret = -EINVAL;
439 goto out;
440 }
441
442 /* If opcode support is present use that interface */
443 if (tlmi_priv.opcode_support) {
444 char pwd_type[8];
445
446 /* Special handling required for HDD and NVMe passwords */
447 if (setting == tlmi_priv.pwd_hdd) {
448 if (setting->level == TLMI_LEVEL_USER)
449 sprintf(pwd_type, "uhdp%d", setting->index);
450 else
451 sprintf(pwd_type, "mhdp%d", setting->index);
452 } else if (setting == tlmi_priv.pwd_nvme) {
453 if (setting->level == TLMI_LEVEL_USER)
454 sprintf(pwd_type, "udrp%d", setting->index);
455 else
456 sprintf(pwd_type, "adrp%d", setting->index);
457 } else {
458 sprintf(pwd_type, "%s", setting->pwd_type);
459 }
460
461 ret = tlmi_opcode_setting("WmiOpcodePasswordType", pwd_type);
462 if (ret)
463 goto out;
464
465 if (tlmi_priv.pwd_admin->valid) {
466 ret = tlmi_opcode_setting("WmiOpcodePasswordAdmin",
467 tlmi_priv.pwd_admin->password);
468 if (ret)
469 goto out;
470 }
471 ret = tlmi_opcode_setting("WmiOpcodePasswordCurrent01", setting->password);
472 if (ret)
473 goto out;
474 ret = tlmi_opcode_setting("WmiOpcodePasswordNew01", new_pwd);
475 if (ret)
476 goto out;
477 ret = tlmi_simple_call(LENOVO_OPCODE_IF_GUID, "WmiOpcodePasswordSetUpdate;");
478 } else {
479 /* Format: 'PasswordType,CurrentPw,NewPw,Encoding,KbdLang;' */
480 auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s,%s,%s;",
481 setting->pwd_type, setting->password, new_pwd,
482 encoding_options[setting->encoding], setting->kbdlang);
483 if (!auth_str) {
484 ret = -ENOMEM;
485 goto out;
486 }
487 ret = tlmi_simple_call(LENOVO_SET_BIOS_PASSWORD_GUID, auth_str);
488 kfree(auth_str);
489 }
490out:
491 mutex_unlock(&tlmi_mutex);
492 kfree(new_pwd);
493 return ret ?: count;
494}
495
496static struct kobj_attribute auth_new_password = __ATTR_WO(new_password);
497
498static ssize_t min_password_length_show(struct kobject *kobj, struct kobj_attribute *attr,
499 char *buf)
500{
501 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
502
503 return sysfs_emit(buf, "%d\n", setting->minlen);
504}
505
506static struct kobj_attribute auth_min_pass_length = __ATTR_RO(min_password_length);
507
508static ssize_t max_password_length_show(struct kobject *kobj, struct kobj_attribute *attr,
509 char *buf)
510{
511 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
512
513 return sysfs_emit(buf, "%d\n", setting->maxlen);
514}
515static struct kobj_attribute auth_max_pass_length = __ATTR_RO(max_password_length);
516
517static ssize_t mechanism_show(struct kobject *kobj, struct kobj_attribute *attr,
518 char *buf)
519{
520 return sysfs_emit(buf, "password\n");
521}
522static struct kobj_attribute auth_mechanism = __ATTR_RO(mechanism);
523
524static ssize_t encoding_show(struct kobject *kobj, struct kobj_attribute *attr,
525 char *buf)
526{
527 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
528
529 return sysfs_emit(buf, "%s\n", encoding_options[setting->encoding]);
530}
531
532static ssize_t encoding_store(struct kobject *kobj,
533 struct kobj_attribute *attr,
534 const char *buf, size_t count)
535{
536 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
537 int i;
538
539 /* Scan for a matching profile */
540 i = sysfs_match_string(encoding_options, buf);
541 if (i < 0)
542 return -EINVAL;
543
544 setting->encoding = i;
545 return count;
546}
547
548static struct kobj_attribute auth_encoding = __ATTR_RW(encoding);
549
550static ssize_t kbdlang_show(struct kobject *kobj, struct kobj_attribute *attr,
551 char *buf)
552{
553 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
554
555 return sysfs_emit(buf, "%s\n", setting->kbdlang);
556}
557
558static ssize_t kbdlang_store(struct kobject *kobj,
559 struct kobj_attribute *attr,
560 const char *buf, size_t count)
561{
562 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
563 int length;
564
565 /* Calculate length till '\n' or terminating 0 */
566 length = strchrnul(buf, '\n') - buf;
567 if (!length || length >= TLMI_LANG_MAXLEN)
568 return -EINVAL;
569
570 memcpy(setting->kbdlang, buf, length);
571 setting->kbdlang[length] = '\0';
572 return count;
573}
574
575static struct kobj_attribute auth_kbdlang = __ATTR_RW(kbdlang);
576
577static ssize_t role_show(struct kobject *kobj, struct kobj_attribute *attr,
578 char *buf)
579{
580 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
581
582 return sysfs_emit(buf, "%s\n", setting->role);
583}
584static struct kobj_attribute auth_role = __ATTR_RO(role);
585
586static ssize_t index_show(struct kobject *kobj, struct kobj_attribute *attr,
587 char *buf)
588{
589 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
590
591 return sysfs_emit(buf, "%d\n", setting->index);
592}
593
594static ssize_t index_store(struct kobject *kobj,
595 struct kobj_attribute *attr,
596 const char *buf, size_t count)
597{
598 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
599 int err, val;
600
601 err = kstrtoint(buf, 10, &val);
602 if (err < 0)
603 return err;
604
605 if (val < 0 || val > TLMI_INDEX_MAX)
606 return -EINVAL;
607
608 setting->index = val;
609 return count;
610}
611
612static struct kobj_attribute auth_index = __ATTR_RW(index);
613
614static ssize_t level_show(struct kobject *kobj, struct kobj_attribute *attr,
615 char *buf)
616{
617 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
618
619 return sysfs_emit(buf, "%s\n", level_options[setting->level]);
620}
621
622static ssize_t level_store(struct kobject *kobj,
623 struct kobj_attribute *attr,
624 const char *buf, size_t count)
625{
626 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
627 int i;
628
629 /* Scan for a matching profile */
630 i = sysfs_match_string(level_options, buf);
631 if (i < 0)
632 return -EINVAL;
633
634 setting->level = i;
635 return count;
636}
637
638static struct kobj_attribute auth_level = __ATTR_RW(level);
639
640static ssize_t cert_thumbprint(char *buf, const char *arg, int count)
641{
642 const struct acpi_buffer input = { strlen(arg), (char *)arg };
643 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
644 const union acpi_object *obj;
645 acpi_status status;
646
647 status = wmi_evaluate_method(LENOVO_CERT_THUMBPRINT_GUID, 0, 0, &input, &output);
648 if (ACPI_FAILURE(status)) {
649 kfree(output.pointer);
650 return -EIO;
651 }
652 obj = output.pointer;
653 if (!obj)
654 return -ENOMEM;
655 if (obj->type != ACPI_TYPE_STRING || !obj->string.pointer) {
656 kfree(output.pointer);
657 return -EIO;
658 }
659 count += sysfs_emit_at(buf, count, "%s : %s\n", arg, (char *)obj->string.pointer);
660 kfree(output.pointer);
661
662 return count;
663}
664
665static ssize_t certificate_thumbprint_show(struct kobject *kobj, struct kobj_attribute *attr,
666 char *buf)
667{
668 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
669 int count = 0;
670
671 if (!tlmi_priv.certificate_support || !setting->cert_installed)
672 return -EOPNOTSUPP;
673
674 count += cert_thumbprint(buf, "Md5", count);
675 count += cert_thumbprint(buf, "Sha1", count);
676 count += cert_thumbprint(buf, "Sha256", count);
677 return count;
678}
679
680static struct kobj_attribute auth_cert_thumb = __ATTR_RO(certificate_thumbprint);
681
682static ssize_t cert_to_password_store(struct kobject *kobj,
683 struct kobj_attribute *attr,
684 const char *buf, size_t count)
685{
686 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
687 char *auth_str, *passwd;
688 int ret;
689
690 if (!capable(CAP_SYS_ADMIN))
691 return -EPERM;
692
693 if (!tlmi_priv.certificate_support)
694 return -EOPNOTSUPP;
695
696 if (!setting->cert_installed)
697 return -EINVAL;
698
699 if (!setting->signature || !setting->signature[0])
700 return -EACCES;
701
702 /* Strip out CR if one is present */
703 passwd = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
704 if (!passwd)
705 return -ENOMEM;
706
707 /* Format: 'Password,Signature' */
708 auth_str = kasprintf(GFP_KERNEL, "%s,%s", passwd, setting->signature);
709 if (!auth_str) {
710 kfree_sensitive(passwd);
711 return -ENOMEM;
712 }
713 ret = tlmi_simple_call(LENOVO_CERT_TO_PASSWORD_GUID, auth_str);
714 kfree(auth_str);
715 kfree_sensitive(passwd);
716
717 return ret ?: count;
718}
719
720static struct kobj_attribute auth_cert_to_password = __ATTR_WO(cert_to_password);
721
722static ssize_t certificate_store(struct kobject *kobj,
723 struct kobj_attribute *attr,
724 const char *buf, size_t count)
725{
726 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
727 char *auth_str, *new_cert;
728 char *guid;
729 int ret;
730
731 if (!capable(CAP_SYS_ADMIN))
732 return -EPERM;
733
734 if (!tlmi_priv.certificate_support)
735 return -EOPNOTSUPP;
736
737 /* If empty then clear installed certificate */
738 if ((buf[0] == '\0') || (buf[0] == '\n')) { /* Clear installed certificate */
739 /* Check that signature is set */
740 if (!setting->signature || !setting->signature[0])
741 return -EACCES;
742
743 /* Format: 'serial#, signature' */
744 auth_str = kasprintf(GFP_KERNEL, "%s,%s",
745 dmi_get_system_info(DMI_PRODUCT_SERIAL),
746 setting->signature);
747 if (!auth_str)
748 return -ENOMEM;
749
750 ret = tlmi_simple_call(LENOVO_CLEAR_BIOS_CERT_GUID, auth_str);
751 kfree(auth_str);
752
753 return ret ?: count;
754 }
755
756 /* Strip out CR if one is present */
757 new_cert = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
758 if (!new_cert)
759 return -ENOMEM;
760
761 if (setting->cert_installed) {
762 /* Certificate is installed so this is an update */
763 if (!setting->signature || !setting->signature[0]) {
764 kfree(new_cert);
765 return -EACCES;
766 }
767 guid = LENOVO_UPDATE_BIOS_CERT_GUID;
768 /* Format: 'Certificate,Signature' */
769 auth_str = kasprintf(GFP_KERNEL, "%s,%s",
770 new_cert, setting->signature);
771 } else {
772 /* This is a fresh install */
773 if (!setting->valid || !setting->password[0]) {
774 kfree(new_cert);
775 return -EACCES;
776 }
777 guid = LENOVO_SET_BIOS_CERT_GUID;
778 /* Format: 'Certificate,Admin-password' */
779 auth_str = kasprintf(GFP_KERNEL, "%s,%s",
780 new_cert, setting->password);
781 }
782 kfree(new_cert);
783 if (!auth_str)
784 return -ENOMEM;
785
786 ret = tlmi_simple_call(guid, auth_str);
787 kfree(auth_str);
788
789 return ret ?: count;
790}
791
792static struct kobj_attribute auth_certificate = __ATTR_WO(certificate);
793
794static ssize_t signature_store(struct kobject *kobj,
795 struct kobj_attribute *attr,
796 const char *buf, size_t count)
797{
798 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
799 char *new_signature;
800
801 if (!capable(CAP_SYS_ADMIN))
802 return -EPERM;
803
804 if (!tlmi_priv.certificate_support)
805 return -EOPNOTSUPP;
806
807 /* Strip out CR if one is present */
808 new_signature = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
809 if (!new_signature)
810 return -ENOMEM;
811
812 /* Free any previous signature */
813 kfree(setting->signature);
814 setting->signature = new_signature;
815
816 return count;
817}
818
819static struct kobj_attribute auth_signature = __ATTR_WO(signature);
820
821static ssize_t save_signature_store(struct kobject *kobj,
822 struct kobj_attribute *attr,
823 const char *buf, size_t count)
824{
825 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
826 char *new_signature;
827
828 if (!capable(CAP_SYS_ADMIN))
829 return -EPERM;
830
831 if (!tlmi_priv.certificate_support)
832 return -EOPNOTSUPP;
833
834 /* Strip out CR if one is present */
835 new_signature = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
836 if (!new_signature)
837 return -ENOMEM;
838
839 /* Free any previous signature */
840 kfree(setting->save_signature);
841 setting->save_signature = new_signature;
842
843 return count;
844}
845
846static struct kobj_attribute auth_save_signature = __ATTR_WO(save_signature);
847
848static umode_t auth_attr_is_visible(struct kobject *kobj,
849 struct attribute *attr, int n)
850{
851 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
852
853 /* We only want to display level and index settings on HDD/NVMe */
854 if (attr == &auth_index.attr || attr == &auth_level.attr) {
855 if ((setting == tlmi_priv.pwd_hdd) || (setting == tlmi_priv.pwd_nvme))
856 return attr->mode;
857 return 0;
858 }
859
860 /* We only display certificates on Admin account, if supported */
861 if (attr == &auth_certificate.attr ||
862 attr == &auth_signature.attr ||
863 attr == &auth_save_signature.attr ||
864 attr == &auth_cert_thumb.attr ||
865 attr == &auth_cert_to_password.attr) {
866 if ((setting == tlmi_priv.pwd_admin) && tlmi_priv.certificate_support)
867 return attr->mode;
868 return 0;
869 }
870
871 /* Don't display un-needed settings if opcode available */
872 if ((attr == &auth_encoding.attr || attr == &auth_kbdlang.attr) &&
873 tlmi_priv.opcode_support)
874 return 0;
875
876 return attr->mode;
877}
878
879static struct attribute *auth_attrs[] = {
880 &auth_is_pass_set.attr,
881 &auth_min_pass_length.attr,
882 &auth_max_pass_length.attr,
883 &auth_current_password.attr,
884 &auth_new_password.attr,
885 &auth_role.attr,
886 &auth_mechanism.attr,
887 &auth_encoding.attr,
888 &auth_kbdlang.attr,
889 &auth_index.attr,
890 &auth_level.attr,
891 &auth_certificate.attr,
892 &auth_signature.attr,
893 &auth_save_signature.attr,
894 &auth_cert_thumb.attr,
895 &auth_cert_to_password.attr,
896 NULL
897};
898
899static const struct attribute_group auth_attr_group = {
900 .is_visible = auth_attr_is_visible,
901 .attrs = auth_attrs,
902};
903
904/* ---- Attributes sysfs --------------------------------------------------------- */
905static ssize_t display_name_show(struct kobject *kobj, struct kobj_attribute *attr,
906 char *buf)
907{
908 struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
909
910 return sysfs_emit(buf, "%s\n", setting->display_name);
911}
912
913static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
914{
915 struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
916 char *item, *value;
917 int ret;
918
919 ret = tlmi_setting(setting->index, &item, LENOVO_BIOS_SETTING_GUID);
920 if (ret)
921 return ret;
922
923 /* validate and split from `item,value` -> `value` */
924 value = strpbrk(item, ",");
925 if (!value || value == item || !strlen(value + 1))
926 ret = -EINVAL;
927 else {
928 /* On Workstations remove the Options part after the value */
929 strreplace(value, ';', '\0');
930 ret = sysfs_emit(buf, "%s\n", value + 1);
931 }
932 kfree(item);
933
934 return ret;
935}
936
937static ssize_t possible_values_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
938{
939 struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
940
941 return sysfs_emit(buf, "%s\n", setting->possible_values);
942}
943
944static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
945 char *buf)
946{
947 struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
948
949 if (setting->possible_values) {
950 /* Figure out what setting type is as BIOS does not return this */
951 if (strchr(setting->possible_values, ';'))
952 return sysfs_emit(buf, "enumeration\n");
953 }
954 /* Anything else is going to be a string */
955 return sysfs_emit(buf, "string\n");
956}
957
958static ssize_t current_value_store(struct kobject *kobj,
959 struct kobj_attribute *attr,
960 const char *buf, size_t count)
961{
962 struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
963 char *set_str = NULL, *new_setting = NULL;
964 char *auth_str = NULL;
965 int ret;
966
967 if (!tlmi_priv.can_set_bios_settings)
968 return -EOPNOTSUPP;
969
970 /*
971 * If we are using bulk saves a reboot should be done once save has
972 * been called
973 */
974 if (tlmi_priv.save_mode == TLMI_SAVE_BULK && tlmi_priv.reboot_required)
975 return -EPERM;
976
977 /* Strip out CR if one is present */
978 new_setting = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
979 if (!new_setting)
980 return -ENOMEM;
981
982 /* Use lock in case multiple WMI operations needed */
983 mutex_lock(&tlmi_mutex);
984
985 /* Check if certificate authentication is enabled and active */
986 if (tlmi_priv.certificate_support && tlmi_priv.pwd_admin->cert_installed) {
987 if (!tlmi_priv.pwd_admin->signature || !tlmi_priv.pwd_admin->save_signature) {
988 ret = -EINVAL;
989 goto out;
990 }
991 set_str = kasprintf(GFP_KERNEL, "%s,%s,%s", setting->display_name,
992 new_setting, tlmi_priv.pwd_admin->signature);
993 if (!set_str) {
994 ret = -ENOMEM;
995 goto out;
996 }
997
998 ret = tlmi_simple_call(LENOVO_SET_BIOS_SETTING_CERT_GUID, set_str);
999 if (ret)
1000 goto out;
1001 if (tlmi_priv.save_mode == TLMI_SAVE_BULK)
1002 tlmi_priv.save_required = true;
1003 else
1004 ret = tlmi_simple_call(LENOVO_SAVE_BIOS_SETTING_CERT_GUID,
1005 tlmi_priv.pwd_admin->save_signature);
1006 } else if (tlmi_priv.opcode_support) {
1007 /*
1008 * If opcode support is present use that interface.
1009 * Note - this sets the variable and then the password as separate
1010 * WMI calls. Function tlmi_save_bios_settings will error if the
1011 * password is incorrect.
1012 * Workstation's require the opcode to be set before changing the
1013 * attribute.
1014 */
1015 if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
1016 ret = tlmi_opcode_setting("WmiOpcodePasswordAdmin",
1017 tlmi_priv.pwd_admin->password);
1018 if (ret)
1019 goto out;
1020 }
1021
1022 set_str = kasprintf(GFP_KERNEL, "%s,%s;", setting->display_name,
1023 new_setting);
1024 if (!set_str) {
1025 ret = -ENOMEM;
1026 goto out;
1027 }
1028
1029 ret = tlmi_simple_call(LENOVO_SET_BIOS_SETTINGS_GUID, set_str);
1030 if (ret)
1031 goto out;
1032
1033 if (tlmi_priv.save_mode == TLMI_SAVE_BULK)
1034 tlmi_priv.save_required = true;
1035 else
1036 ret = tlmi_save_bios_settings("");
1037 } else { /* old non-opcode based authentication method (deprecated) */
1038 if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
1039 auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
1040 tlmi_priv.pwd_admin->password,
1041 encoding_options[tlmi_priv.pwd_admin->encoding],
1042 tlmi_priv.pwd_admin->kbdlang);
1043 if (!auth_str) {
1044 ret = -ENOMEM;
1045 goto out;
1046 }
1047 }
1048
1049 if (auth_str)
1050 set_str = kasprintf(GFP_KERNEL, "%s,%s,%s", setting->display_name,
1051 new_setting, auth_str);
1052 else
1053 set_str = kasprintf(GFP_KERNEL, "%s,%s;", setting->display_name,
1054 new_setting);
1055 if (!set_str) {
1056 ret = -ENOMEM;
1057 goto out;
1058 }
1059
1060 ret = tlmi_simple_call(LENOVO_SET_BIOS_SETTINGS_GUID, set_str);
1061 if (ret)
1062 goto out;
1063
1064 if (tlmi_priv.save_mode == TLMI_SAVE_BULK) {
1065 tlmi_priv.save_required = true;
1066 } else {
1067 if (auth_str)
1068 ret = tlmi_save_bios_settings(auth_str);
1069 else
1070 ret = tlmi_save_bios_settings("");
1071 }
1072 }
1073 if (!ret && !tlmi_priv.pending_changes) {
1074 tlmi_priv.pending_changes = true;
1075 /* let userland know it may need to check reboot pending again */
1076 kobject_uevent(&tlmi_priv.class_dev->kobj, KOBJ_CHANGE);
1077 }
1078out:
1079 mutex_unlock(&tlmi_mutex);
1080 kfree(auth_str);
1081 kfree(set_str);
1082 kfree(new_setting);
1083 return ret ?: count;
1084}
1085
1086static struct kobj_attribute attr_displ_name = __ATTR_RO(display_name);
1087
1088static struct kobj_attribute attr_possible_values = __ATTR_RO(possible_values);
1089
1090static struct kobj_attribute attr_current_val = __ATTR_RW_MODE(current_value, 0600);
1091
1092static struct kobj_attribute attr_type = __ATTR_RO(type);
1093
1094static umode_t attr_is_visible(struct kobject *kobj,
1095 struct attribute *attr, int n)
1096{
1097 struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
1098
1099 /* We don't want to display possible_values attributes if not available */
1100 if ((attr == &attr_possible_values.attr) && (!setting->possible_values))
1101 return 0;
1102
1103 return attr->mode;
1104}
1105
1106static struct attribute *tlmi_attrs[] = {
1107 &attr_displ_name.attr,
1108 &attr_current_val.attr,
1109 &attr_possible_values.attr,
1110 &attr_type.attr,
1111 NULL
1112};
1113
1114static const struct attribute_group tlmi_attr_group = {
1115 .is_visible = attr_is_visible,
1116 .attrs = tlmi_attrs,
1117};
1118
1119static void tlmi_attr_setting_release(struct kobject *kobj)
1120{
1121 struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
1122
1123 kfree(setting->possible_values);
1124 kfree(setting);
1125}
1126
1127static void tlmi_pwd_setting_release(struct kobject *kobj)
1128{
1129 struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
1130
1131 kfree(setting);
1132}
1133
1134static const struct kobj_type tlmi_attr_setting_ktype = {
1135 .release = &tlmi_attr_setting_release,
1136 .sysfs_ops = &kobj_sysfs_ops,
1137};
1138
1139static const struct kobj_type tlmi_pwd_setting_ktype = {
1140 .release = &tlmi_pwd_setting_release,
1141 .sysfs_ops = &kobj_sysfs_ops,
1142};
1143
1144static ssize_t pending_reboot_show(struct kobject *kobj, struct kobj_attribute *attr,
1145 char *buf)
1146{
1147 return sprintf(buf, "%d\n", tlmi_priv.pending_changes);
1148}
1149
1150static struct kobj_attribute pending_reboot = __ATTR_RO(pending_reboot);
1151
1152static const char * const save_mode_strings[] = {
1153 [TLMI_SAVE_SINGLE] = "single",
1154 [TLMI_SAVE_BULK] = "bulk",
1155 [TLMI_SAVE_SAVE] = "save"
1156};
1157
1158static ssize_t save_settings_show(struct kobject *kobj, struct kobj_attribute *attr,
1159 char *buf)
1160{
1161 /* Check that setting is valid */
1162 if (WARN_ON(tlmi_priv.save_mode < TLMI_SAVE_SINGLE ||
1163 tlmi_priv.save_mode > TLMI_SAVE_BULK))
1164 return -EIO;
1165 return sysfs_emit(buf, "%s\n", save_mode_strings[tlmi_priv.save_mode]);
1166}
1167
1168static ssize_t save_settings_store(struct kobject *kobj, struct kobj_attribute *attr,
1169 const char *buf, size_t count)
1170{
1171 char *auth_str = NULL;
1172 int ret = 0;
1173 int cmd;
1174
1175 cmd = sysfs_match_string(save_mode_strings, buf);
1176 if (cmd < 0)
1177 return cmd;
1178
1179 /* Use lock in case multiple WMI operations needed */
1180 mutex_lock(&tlmi_mutex);
1181
1182 switch (cmd) {
1183 case TLMI_SAVE_SINGLE:
1184 case TLMI_SAVE_BULK:
1185 tlmi_priv.save_mode = cmd;
1186 goto out;
1187 case TLMI_SAVE_SAVE:
1188 /* Check if supported*/
1189 if (!tlmi_priv.can_set_bios_settings ||
1190 tlmi_priv.save_mode == TLMI_SAVE_SINGLE) {
1191 ret = -EOPNOTSUPP;
1192 goto out;
1193 }
1194 /* Check there is actually something to save */
1195 if (!tlmi_priv.save_required) {
1196 ret = -ENOENT;
1197 goto out;
1198 }
1199 /* Check if certificate authentication is enabled and active */
1200 if (tlmi_priv.certificate_support && tlmi_priv.pwd_admin->cert_installed) {
1201 if (!tlmi_priv.pwd_admin->signature ||
1202 !tlmi_priv.pwd_admin->save_signature) {
1203 ret = -EINVAL;
1204 goto out;
1205 }
1206 ret = tlmi_simple_call(LENOVO_SAVE_BIOS_SETTING_CERT_GUID,
1207 tlmi_priv.pwd_admin->save_signature);
1208 if (ret)
1209 goto out;
1210 } else if (tlmi_priv.opcode_support) {
1211 if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
1212 ret = tlmi_opcode_setting("WmiOpcodePasswordAdmin",
1213 tlmi_priv.pwd_admin->password);
1214 if (ret)
1215 goto out;
1216 }
1217 ret = tlmi_save_bios_settings("");
1218 } else { /* old non-opcode based authentication method (deprecated) */
1219 if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
1220 auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
1221 tlmi_priv.pwd_admin->password,
1222 encoding_options[tlmi_priv.pwd_admin->encoding],
1223 tlmi_priv.pwd_admin->kbdlang);
1224 if (!auth_str) {
1225 ret = -ENOMEM;
1226 goto out;
1227 }
1228 }
1229
1230 if (auth_str)
1231 ret = tlmi_save_bios_settings(auth_str);
1232 else
1233 ret = tlmi_save_bios_settings("");
1234 }
1235 tlmi_priv.save_required = false;
1236 tlmi_priv.reboot_required = true;
1237
1238 if (!ret && !tlmi_priv.pending_changes) {
1239 tlmi_priv.pending_changes = true;
1240 /* let userland know it may need to check reboot pending again */
1241 kobject_uevent(&tlmi_priv.class_dev->kobj, KOBJ_CHANGE);
1242 }
1243 break;
1244 }
1245out:
1246 mutex_unlock(&tlmi_mutex);
1247 kfree(auth_str);
1248 return ret ?: count;
1249}
1250
1251static struct kobj_attribute save_settings = __ATTR_RW(save_settings);
1252
1253/* ---- Debug interface--------------------------------------------------------- */
1254static ssize_t debug_cmd_store(struct kobject *kobj, struct kobj_attribute *attr,
1255 const char *buf, size_t count)
1256{
1257 char *set_str = NULL, *new_setting = NULL;
1258 char *auth_str = NULL;
1259 int ret;
1260
1261 if (!tlmi_priv.can_debug_cmd)
1262 return -EOPNOTSUPP;
1263
1264 /* Strip out CR if one is present */
1265 new_setting = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
1266 if (!new_setting)
1267 return -ENOMEM;
1268
1269 if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
1270 auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
1271 tlmi_priv.pwd_admin->password,
1272 encoding_options[tlmi_priv.pwd_admin->encoding],
1273 tlmi_priv.pwd_admin->kbdlang);
1274 if (!auth_str) {
1275 ret = -ENOMEM;
1276 goto out;
1277 }
1278 }
1279
1280 if (auth_str)
1281 set_str = kasprintf(GFP_KERNEL, "%s,%s", new_setting, auth_str);
1282 else
1283 set_str = kasprintf(GFP_KERNEL, "%s;", new_setting);
1284 if (!set_str) {
1285 ret = -ENOMEM;
1286 goto out;
1287 }
1288
1289 ret = tlmi_simple_call(LENOVO_DEBUG_CMD_GUID, set_str);
1290 if (ret)
1291 goto out;
1292
1293 if (!ret && !tlmi_priv.pending_changes) {
1294 tlmi_priv.pending_changes = true;
1295 /* let userland know it may need to check reboot pending again */
1296 kobject_uevent(&tlmi_priv.class_dev->kobj, KOBJ_CHANGE);
1297 }
1298out:
1299 kfree(auth_str);
1300 kfree(set_str);
1301 kfree(new_setting);
1302 return ret ?: count;
1303}
1304
1305static struct kobj_attribute debug_cmd = __ATTR_WO(debug_cmd);
1306
1307/* ---- Initialisation --------------------------------------------------------- */
1308static void tlmi_release_attr(void)
1309{
1310 int i;
1311
1312 /* Attribute structures */
1313 for (i = 0; i < TLMI_SETTINGS_COUNT; i++) {
1314 if (tlmi_priv.setting[i]) {
1315 sysfs_remove_group(&tlmi_priv.setting[i]->kobj, &tlmi_attr_group);
1316 kobject_put(&tlmi_priv.setting[i]->kobj);
1317 }
1318 }
1319 sysfs_remove_file(&tlmi_priv.attribute_kset->kobj, &pending_reboot.attr);
1320 sysfs_remove_file(&tlmi_priv.attribute_kset->kobj, &save_settings.attr);
1321
1322 if (tlmi_priv.can_debug_cmd && debug_support)
1323 sysfs_remove_file(&tlmi_priv.attribute_kset->kobj, &debug_cmd.attr);
1324
1325 kset_unregister(tlmi_priv.attribute_kset);
1326
1327 /* Free up any saved signatures */
1328 kfree(tlmi_priv.pwd_admin->signature);
1329 kfree(tlmi_priv.pwd_admin->save_signature);
1330
1331 /* Authentication structures */
1332 sysfs_remove_group(&tlmi_priv.pwd_admin->kobj, &auth_attr_group);
1333 kobject_put(&tlmi_priv.pwd_admin->kobj);
1334 sysfs_remove_group(&tlmi_priv.pwd_power->kobj, &auth_attr_group);
1335 kobject_put(&tlmi_priv.pwd_power->kobj);
1336
1337 if (tlmi_priv.opcode_support) {
1338 sysfs_remove_group(&tlmi_priv.pwd_system->kobj, &auth_attr_group);
1339 kobject_put(&tlmi_priv.pwd_system->kobj);
1340 sysfs_remove_group(&tlmi_priv.pwd_hdd->kobj, &auth_attr_group);
1341 kobject_put(&tlmi_priv.pwd_hdd->kobj);
1342 sysfs_remove_group(&tlmi_priv.pwd_nvme->kobj, &auth_attr_group);
1343 kobject_put(&tlmi_priv.pwd_nvme->kobj);
1344 }
1345
1346 kset_unregister(tlmi_priv.authentication_kset);
1347}
1348
1349static int tlmi_validate_setting_name(struct kset *attribute_kset, char *name)
1350{
1351 struct kobject *duplicate;
1352
1353 if (!strcmp(name, "Reserved"))
1354 return -EINVAL;
1355
1356 duplicate = kset_find_obj(attribute_kset, name);
1357 if (duplicate) {
1358 pr_debug("Duplicate attribute name found - %s\n", name);
1359 /* kset_find_obj() returns a reference */
1360 kobject_put(duplicate);
1361 return -EBUSY;
1362 }
1363
1364 return 0;
1365}
1366
1367static int tlmi_sysfs_init(void)
1368{
1369 int i, ret;
1370
1371 ret = fw_attributes_class_get(&fw_attr_class);
1372 if (ret)
1373 return ret;
1374
1375 tlmi_priv.class_dev = device_create(fw_attr_class, NULL, MKDEV(0, 0),
1376 NULL, "%s", "thinklmi");
1377 if (IS_ERR(tlmi_priv.class_dev)) {
1378 ret = PTR_ERR(tlmi_priv.class_dev);
1379 goto fail_class_created;
1380 }
1381
1382 tlmi_priv.attribute_kset = kset_create_and_add("attributes", NULL,
1383 &tlmi_priv.class_dev->kobj);
1384 if (!tlmi_priv.attribute_kset) {
1385 ret = -ENOMEM;
1386 goto fail_device_created;
1387 }
1388
1389 for (i = 0; i < TLMI_SETTINGS_COUNT; i++) {
1390 /* Check if index is a valid setting - skip if it isn't */
1391 if (!tlmi_priv.setting[i])
1392 continue;
1393
1394 /* check for duplicate or reserved values */
1395 if (tlmi_validate_setting_name(tlmi_priv.attribute_kset,
1396 tlmi_priv.setting[i]->display_name) < 0) {
1397 kfree(tlmi_priv.setting[i]->possible_values);
1398 kfree(tlmi_priv.setting[i]);
1399 tlmi_priv.setting[i] = NULL;
1400 continue;
1401 }
1402
1403 /* Build attribute */
1404 tlmi_priv.setting[i]->kobj.kset = tlmi_priv.attribute_kset;
1405 ret = kobject_add(&tlmi_priv.setting[i]->kobj, NULL,
1406 "%s", tlmi_priv.setting[i]->display_name);
1407 if (ret)
1408 goto fail_create_attr;
1409
1410 ret = sysfs_create_group(&tlmi_priv.setting[i]->kobj, &tlmi_attr_group);
1411 if (ret)
1412 goto fail_create_attr;
1413 }
1414
1415 ret = sysfs_create_file(&tlmi_priv.attribute_kset->kobj, &pending_reboot.attr);
1416 if (ret)
1417 goto fail_create_attr;
1418
1419 ret = sysfs_create_file(&tlmi_priv.attribute_kset->kobj, &save_settings.attr);
1420 if (ret)
1421 goto fail_create_attr;
1422
1423 if (tlmi_priv.can_debug_cmd && debug_support) {
1424 ret = sysfs_create_file(&tlmi_priv.attribute_kset->kobj, &debug_cmd.attr);
1425 if (ret)
1426 goto fail_create_attr;
1427 }
1428
1429 /* Create authentication entries */
1430 tlmi_priv.authentication_kset = kset_create_and_add("authentication", NULL,
1431 &tlmi_priv.class_dev->kobj);
1432 if (!tlmi_priv.authentication_kset) {
1433 ret = -ENOMEM;
1434 goto fail_create_attr;
1435 }
1436 tlmi_priv.pwd_admin->kobj.kset = tlmi_priv.authentication_kset;
1437 ret = kobject_add(&tlmi_priv.pwd_admin->kobj, NULL, "%s", "Admin");
1438 if (ret)
1439 goto fail_create_attr;
1440
1441 ret = sysfs_create_group(&tlmi_priv.pwd_admin->kobj, &auth_attr_group);
1442 if (ret)
1443 goto fail_create_attr;
1444
1445 tlmi_priv.pwd_power->kobj.kset = tlmi_priv.authentication_kset;
1446 ret = kobject_add(&tlmi_priv.pwd_power->kobj, NULL, "%s", "Power-on");
1447 if (ret)
1448 goto fail_create_attr;
1449
1450 ret = sysfs_create_group(&tlmi_priv.pwd_power->kobj, &auth_attr_group);
1451 if (ret)
1452 goto fail_create_attr;
1453
1454 if (tlmi_priv.opcode_support) {
1455 tlmi_priv.pwd_system->kobj.kset = tlmi_priv.authentication_kset;
1456 ret = kobject_add(&tlmi_priv.pwd_system->kobj, NULL, "%s", "System");
1457 if (ret)
1458 goto fail_create_attr;
1459
1460 ret = sysfs_create_group(&tlmi_priv.pwd_system->kobj, &auth_attr_group);
1461 if (ret)
1462 goto fail_create_attr;
1463
1464 tlmi_priv.pwd_hdd->kobj.kset = tlmi_priv.authentication_kset;
1465 ret = kobject_add(&tlmi_priv.pwd_hdd->kobj, NULL, "%s", "HDD");
1466 if (ret)
1467 goto fail_create_attr;
1468
1469 ret = sysfs_create_group(&tlmi_priv.pwd_hdd->kobj, &auth_attr_group);
1470 if (ret)
1471 goto fail_create_attr;
1472
1473 tlmi_priv.pwd_nvme->kobj.kset = tlmi_priv.authentication_kset;
1474 ret = kobject_add(&tlmi_priv.pwd_nvme->kobj, NULL, "%s", "NVMe");
1475 if (ret)
1476 goto fail_create_attr;
1477
1478 ret = sysfs_create_group(&tlmi_priv.pwd_nvme->kobj, &auth_attr_group);
1479 if (ret)
1480 goto fail_create_attr;
1481 }
1482
1483 return ret;
1484
1485fail_create_attr:
1486 tlmi_release_attr();
1487fail_device_created:
1488 device_destroy(fw_attr_class, MKDEV(0, 0));
1489fail_class_created:
1490 fw_attributes_class_put();
1491 return ret;
1492}
1493
1494/* ---- Base Driver -------------------------------------------------------- */
1495static struct tlmi_pwd_setting *tlmi_create_auth(const char *pwd_type,
1496 const char *pwd_role)
1497{
1498 struct tlmi_pwd_setting *new_pwd;
1499
1500 new_pwd = kzalloc(sizeof(struct tlmi_pwd_setting), GFP_KERNEL);
1501 if (!new_pwd)
1502 return NULL;
1503
1504 strscpy(new_pwd->kbdlang, "us", TLMI_LANG_MAXLEN);
1505 new_pwd->encoding = TLMI_ENCODING_ASCII;
1506 new_pwd->pwd_type = pwd_type;
1507 new_pwd->role = pwd_role;
1508 new_pwd->minlen = tlmi_priv.pwdcfg.core.min_length;
1509 new_pwd->maxlen = tlmi_priv.pwdcfg.core.max_length;
1510 new_pwd->index = 0;
1511
1512 kobject_init(&new_pwd->kobj, &tlmi_pwd_setting_ktype);
1513
1514 return new_pwd;
1515}
1516
1517static int tlmi_analyze(void)
1518{
1519 int i, ret;
1520
1521 if (wmi_has_guid(LENOVO_SET_BIOS_SETTINGS_GUID) &&
1522 wmi_has_guid(LENOVO_SAVE_BIOS_SETTINGS_GUID))
1523 tlmi_priv.can_set_bios_settings = true;
1524
1525 if (wmi_has_guid(LENOVO_GET_BIOS_SELECTIONS_GUID))
1526 tlmi_priv.can_get_bios_selections = true;
1527
1528 if (wmi_has_guid(LENOVO_SET_BIOS_PASSWORD_GUID))
1529 tlmi_priv.can_set_bios_password = true;
1530
1531 if (wmi_has_guid(LENOVO_BIOS_PASSWORD_SETTINGS_GUID))
1532 tlmi_priv.can_get_password_settings = true;
1533
1534 if (wmi_has_guid(LENOVO_DEBUG_CMD_GUID))
1535 tlmi_priv.can_debug_cmd = true;
1536
1537 if (wmi_has_guid(LENOVO_OPCODE_IF_GUID))
1538 tlmi_priv.opcode_support = true;
1539
1540 if (wmi_has_guid(LENOVO_SET_BIOS_CERT_GUID) &&
1541 wmi_has_guid(LENOVO_SET_BIOS_SETTING_CERT_GUID) &&
1542 wmi_has_guid(LENOVO_SAVE_BIOS_SETTING_CERT_GUID))
1543 tlmi_priv.certificate_support = true;
1544
1545 /*
1546 * Try to find the number of valid settings of this machine
1547 * and use it to create sysfs attributes.
1548 */
1549 for (i = 0; i < TLMI_SETTINGS_COUNT; ++i) {
1550 struct tlmi_attr_setting *setting;
1551 char *item = NULL;
1552
1553 tlmi_priv.setting[i] = NULL;
1554 ret = tlmi_setting(i, &item, LENOVO_BIOS_SETTING_GUID);
1555 if (ret)
1556 break;
1557 if (!item)
1558 break;
1559 if (!*item) {
1560 kfree(item);
1561 continue;
1562 }
1563
1564 /* It is not allowed to have '/' for file name. Convert it into '\'. */
1565 strreplace(item, '/', '\\');
1566
1567 /* Remove the value part */
1568 strreplace(item, ',', '\0');
1569
1570 /* Create a setting entry */
1571 setting = kzalloc(sizeof(*setting), GFP_KERNEL);
1572 if (!setting) {
1573 ret = -ENOMEM;
1574 kfree(item);
1575 goto fail_clear_attr;
1576 }
1577 setting->index = i;
1578 strscpy(setting->display_name, item, TLMI_SETTINGS_MAXLEN);
1579 /* If BIOS selections supported, load those */
1580 if (tlmi_priv.can_get_bios_selections) {
1581 ret = tlmi_get_bios_selections(setting->display_name,
1582 &setting->possible_values);
1583 if (ret || !setting->possible_values)
1584 pr_info("Error retrieving possible values for %d : %s\n",
1585 i, setting->display_name);
1586 } else {
1587 /*
1588 * Older Thinkstations don't support the bios_selections API.
1589 * Instead they store this as a [Optional:Option1,Option2] section of the
1590 * name string.
1591 * Try and pull that out if it's available.
1592 */
1593 char *optitem, *optstart, *optend;
1594
1595 if (!tlmi_setting(setting->index, &optitem, LENOVO_BIOS_SETTING_GUID)) {
1596 optstart = strstr(optitem, "[Optional:");
1597 if (optstart) {
1598 optstart += strlen("[Optional:");
1599 optend = strstr(optstart, "]");
1600 if (optend)
1601 setting->possible_values =
1602 kstrndup(optstart, optend - optstart,
1603 GFP_KERNEL);
1604 }
1605 kfree(optitem);
1606 }
1607 }
1608 /*
1609 * firmware-attributes requires that possible_values are separated by ';' but
1610 * Lenovo FW uses ','. Replace appropriately.
1611 */
1612 if (setting->possible_values)
1613 strreplace(setting->possible_values, ',', ';');
1614
1615 kobject_init(&setting->kobj, &tlmi_attr_setting_ktype);
1616 tlmi_priv.setting[i] = setting;
1617 kfree(item);
1618 }
1619
1620 /* Create password setting structure */
1621 ret = tlmi_get_pwd_settings(&tlmi_priv.pwdcfg);
1622 if (ret)
1623 goto fail_clear_attr;
1624
1625 /* All failures below boil down to kmalloc failures */
1626 ret = -ENOMEM;
1627
1628 tlmi_priv.pwd_admin = tlmi_create_auth("pap", "bios-admin");
1629 if (!tlmi_priv.pwd_admin)
1630 goto fail_clear_attr;
1631
1632 if (tlmi_priv.pwdcfg.core.password_state & TLMI_PAP_PWD)
1633 tlmi_priv.pwd_admin->valid = true;
1634
1635 tlmi_priv.pwd_power = tlmi_create_auth("pop", "power-on");
1636 if (!tlmi_priv.pwd_power)
1637 goto fail_clear_attr;
1638
1639 if (tlmi_priv.pwdcfg.core.password_state & TLMI_POP_PWD)
1640 tlmi_priv.pwd_power->valid = true;
1641
1642 if (tlmi_priv.opcode_support) {
1643 tlmi_priv.pwd_system = tlmi_create_auth("smp", "system");
1644 if (!tlmi_priv.pwd_system)
1645 goto fail_clear_attr;
1646
1647 if (tlmi_priv.pwdcfg.core.password_state & TLMI_SMP_PWD)
1648 tlmi_priv.pwd_system->valid = true;
1649
1650 tlmi_priv.pwd_hdd = tlmi_create_auth("hdd", "hdd");
1651 if (!tlmi_priv.pwd_hdd)
1652 goto fail_clear_attr;
1653
1654 tlmi_priv.pwd_nvme = tlmi_create_auth("nvm", "nvme");
1655 if (!tlmi_priv.pwd_nvme)
1656 goto fail_clear_attr;
1657
1658 /* Set default hdd/nvme index to 1 as there is no device 0 */
1659 tlmi_priv.pwd_hdd->index = 1;
1660 tlmi_priv.pwd_nvme->index = 1;
1661
1662 if (tlmi_priv.pwdcfg.core.password_state & TLMI_HDD_PWD) {
1663 /* Check if PWD is configured and set index to first drive found */
1664 if (tlmi_priv.pwdcfg.ext.hdd_user_password ||
1665 tlmi_priv.pwdcfg.ext.hdd_master_password) {
1666 tlmi_priv.pwd_hdd->valid = true;
1667 if (tlmi_priv.pwdcfg.ext.hdd_master_password)
1668 tlmi_priv.pwd_hdd->index =
1669 ffs(tlmi_priv.pwdcfg.ext.hdd_master_password) - 1;
1670 else
1671 tlmi_priv.pwd_hdd->index =
1672 ffs(tlmi_priv.pwdcfg.ext.hdd_user_password) - 1;
1673 }
1674 if (tlmi_priv.pwdcfg.ext.nvme_user_password ||
1675 tlmi_priv.pwdcfg.ext.nvme_master_password) {
1676 tlmi_priv.pwd_nvme->valid = true;
1677 if (tlmi_priv.pwdcfg.ext.nvme_master_password)
1678 tlmi_priv.pwd_nvme->index =
1679 ffs(tlmi_priv.pwdcfg.ext.nvme_master_password) - 1;
1680 else
1681 tlmi_priv.pwd_nvme->index =
1682 ffs(tlmi_priv.pwdcfg.ext.nvme_user_password) - 1;
1683 }
1684 }
1685 }
1686
1687 if (tlmi_priv.certificate_support &&
1688 (tlmi_priv.pwdcfg.core.password_state & TLMI_CERT))
1689 tlmi_priv.pwd_admin->cert_installed = true;
1690
1691 return 0;
1692
1693fail_clear_attr:
1694 for (i = 0; i < TLMI_SETTINGS_COUNT; ++i) {
1695 if (tlmi_priv.setting[i]) {
1696 kfree(tlmi_priv.setting[i]->possible_values);
1697 kfree(tlmi_priv.setting[i]);
1698 }
1699 }
1700 kfree(tlmi_priv.pwd_admin);
1701 kfree(tlmi_priv.pwd_power);
1702 kfree(tlmi_priv.pwd_system);
1703 kfree(tlmi_priv.pwd_hdd);
1704 kfree(tlmi_priv.pwd_nvme);
1705 return ret;
1706}
1707
1708static void tlmi_remove(struct wmi_device *wdev)
1709{
1710 tlmi_release_attr();
1711 device_destroy(fw_attr_class, MKDEV(0, 0));
1712 fw_attributes_class_put();
1713}
1714
1715static int tlmi_probe(struct wmi_device *wdev, const void *context)
1716{
1717 int ret;
1718
1719 ret = tlmi_analyze();
1720 if (ret)
1721 return ret;
1722
1723 return tlmi_sysfs_init();
1724}
1725
1726static const struct wmi_device_id tlmi_id_table[] = {
1727 { .guid_string = LENOVO_BIOS_SETTING_GUID },
1728 { }
1729};
1730MODULE_DEVICE_TABLE(wmi, tlmi_id_table);
1731
1732static struct wmi_driver tlmi_driver = {
1733 .driver = {
1734 .name = "think-lmi",
1735 },
1736 .id_table = tlmi_id_table,
1737 .probe = tlmi_probe,
1738 .remove = tlmi_remove,
1739};
1740
1741MODULE_AUTHOR("Sugumaran L <slacshiminar@lenovo.com>");
1742MODULE_AUTHOR("Mark Pearson <markpearson@lenovo.com>");
1743MODULE_AUTHOR("Corentin Chary <corentin.chary@gmail.com>");
1744MODULE_DESCRIPTION("ThinkLMI Driver");
1745MODULE_LICENSE("GPL");
1746
1747module_wmi_driver(tlmi_driver);