1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Common methods for use with hp-bioscfg driver
4 *
5 * Copyright (c) 2022 HP Development Company, L.P.
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/fs.h>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/printk.h>
14 #include <linux/string.h>
15 #include <linux/wmi.h>
16 #include "bioscfg.h"
17 #include "../../firmware_attributes_class.h"
18 #include <linux/nls.h>
19 #include <linux/errno.h>
20
21 MODULE_AUTHOR("Jorge Lopez <jorge.lopez2@hp.com>");
22 MODULE_DESCRIPTION("HP BIOS Configuration Driver");
23 MODULE_LICENSE("GPL");
24
25 struct bioscfg_priv bioscfg_drv = {
26 .mutex = __MUTEX_INITIALIZER(bioscfg_drv.mutex),
27 };
28
display_name_language_code_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)29 ssize_t display_name_language_code_show(struct kobject *kobj,
30 struct kobj_attribute *attr,
31 char *buf)
32 {
33 return sysfs_emit(buf, "%s\n", LANG_CODE_STR);
34 }
35
36 struct kobj_attribute common_display_langcode =
37 __ATTR_RO(display_name_language_code);
38
hp_get_integer_from_buffer(u8 ** buffer,u32 * buffer_size,u32 * integer)39 int hp_get_integer_from_buffer(u8 **buffer, u32 *buffer_size, u32 *integer)
40 {
41 int *ptr = PTR_ALIGN((int *)*buffer, sizeof(int));
42
43 /* Ensure there is enough space remaining to read the integer */
44 if (*buffer_size < sizeof(int))
45 return -EINVAL;
46
47 *integer = *(ptr++);
48 *buffer = (u8 *)ptr;
49 *buffer_size -= sizeof(int);
50
51 return 0;
52 }
53
hp_get_string_from_buffer(u8 ** buffer,u32 * buffer_size,char * dst,u32 dst_size)54 int hp_get_string_from_buffer(u8 **buffer, u32 *buffer_size, char *dst, u32 dst_size)
55 {
56 u16 *src = (u16 *)*buffer;
57 u16 src_size;
58
59 u16 size;
60 int i;
61 int conv_dst_size;
62
63 if (*buffer_size < sizeof(u16))
64 return -EINVAL;
65
66 src_size = *(src++);
67 /* size value in u16 chars */
68 size = src_size / sizeof(u16);
69
70 /* Ensure there is enough space remaining to read and convert
71 * the string
72 */
73 if (*buffer_size < src_size)
74 return -EINVAL;
75
76 for (i = 0; i < size; i++)
77 if (src[i] == '\\' ||
78 src[i] == '\r' ||
79 src[i] == '\n' ||
80 src[i] == '\t')
81 size++;
82
83 /*
84 * Conversion is limited to destination string max number of
85 * bytes.
86 */
87 conv_dst_size = size;
88 if (size > dst_size)
89 conv_dst_size = dst_size - 1;
90
91 /*
92 * convert from UTF-16 unicode to ASCII
93 */
94 utf16s_to_utf8s(src, src_size, UTF16_HOST_ENDIAN, dst, conv_dst_size);
95 dst[conv_dst_size] = 0;
96
97 for (i = 0; i < conv_dst_size; i++) {
98 if (*src == '\\' ||
99 *src == '\r' ||
100 *src == '\n' ||
101 *src == '\t') {
102 dst[i++] = '\\';
103 if (i == conv_dst_size)
104 break;
105 }
106
107 if (*src == '\r')
108 dst[i] = 'r';
109 else if (*src == '\n')
110 dst[i] = 'n';
111 else if (*src == '\t')
112 dst[i] = 't';
113 else if (*src == '"')
114 dst[i] = '\'';
115 else
116 dst[i] = *src;
117 src++;
118 }
119
120 *buffer = (u8 *)src;
121 *buffer_size -= size * sizeof(u16);
122
123 return size;
124 }
125
hp_get_common_data_from_buffer(u8 ** buffer_ptr,u32 * buffer_size,struct common_data * common_data)126 int hp_get_common_data_from_buffer(u8 **buffer_ptr, u32 *buffer_size,
127 struct common_data *common_data)
128 {
129 int ret = 0;
130 int reqs;
131
132 // PATH:
133 ret = hp_get_string_from_buffer(buffer_ptr, buffer_size, common_data->path,
134 sizeof(common_data->path));
135 if (ret < 0)
136 goto common_exit;
137
138 // IS_READONLY:
139 ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size,
140 &common_data->is_readonly);
141 if (ret < 0)
142 goto common_exit;
143
144 //DISPLAY_IN_UI:
145 ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size,
146 &common_data->display_in_ui);
147 if (ret < 0)
148 goto common_exit;
149
150 // REQUIRES_PHYSICAL_PRESENCE:
151 ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size,
152 &common_data->requires_physical_presence);
153 if (ret < 0)
154 goto common_exit;
155
156 // SEQUENCE:
157 ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size,
158 &common_data->sequence);
159 if (ret < 0)
160 goto common_exit;
161
162 // PREREQUISITES_SIZE:
163 ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size,
164 &common_data->prerequisites_size);
165 if (ret < 0)
166 goto common_exit;
167
168 if (common_data->prerequisites_size > MAX_PREREQUISITES_SIZE) {
169 /* Report a message and limit prerequisite size to maximum value */
170 pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n");
171 common_data->prerequisites_size = MAX_PREREQUISITES_SIZE;
172 }
173
174 // PREREQUISITES:
175 for (reqs = 0; reqs < common_data->prerequisites_size; reqs++) {
176 ret = hp_get_string_from_buffer(buffer_ptr, buffer_size,
177 common_data->prerequisites[reqs],
178 sizeof(common_data->prerequisites[reqs]));
179 if (ret < 0)
180 break;
181 }
182
183 // SECURITY_LEVEL:
184 ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size,
185 &common_data->security_level);
186
187 common_exit:
188 return ret;
189 }
190
hp_enforce_single_line_input(char * buf,size_t count)191 int hp_enforce_single_line_input(char *buf, size_t count)
192 {
193 char *p;
194
195 p = memchr(buf, '\n', count);
196
197 if (p == buf + count - 1)
198 *p = '\0'; /* strip trailing newline */
199 else if (p)
200 return -EINVAL; /* enforce single line input */
201
202 return 0;
203 }
204
205 /* Set pending reboot value and generate KOBJ_NAME event */
hp_set_reboot_and_signal_event(void)206 void hp_set_reboot_and_signal_event(void)
207 {
208 bioscfg_drv.pending_reboot = true;
209 kobject_uevent(&bioscfg_drv.class_dev->kobj, KOBJ_CHANGE);
210 }
211
212 /**
213 * hp_calculate_string_buffer() - determines size of string buffer for
214 * use with BIOS communication
215 *
216 * @str: the string to calculate based upon
217 */
hp_calculate_string_buffer(const char * str)218 size_t hp_calculate_string_buffer(const char *str)
219 {
220 size_t length = strlen(str);
221
222 /* BIOS expects 4 bytes when an empty string is found */
223 if (length == 0)
224 return 4;
225
226 /* u16 length field + one UTF16 char for each input char */
227 return sizeof(u16) + strlen(str) * sizeof(u16);
228 }
229
hp_wmi_error_and_message(int error_code)230 int hp_wmi_error_and_message(int error_code)
231 {
232 char *error_msg = NULL;
233 int ret;
234
235 switch (error_code) {
236 case SUCCESS:
237 error_msg = "Success";
238 ret = 0;
239 break;
240 case CMD_FAILED:
241 error_msg = "Command failed";
242 ret = -EINVAL;
243 break;
244 case INVALID_SIGN:
245 error_msg = "Invalid signature";
246 ret = -EINVAL;
247 break;
248 case INVALID_CMD_VALUE:
249 error_msg = "Invalid command value/Feature not supported";
250 ret = -EOPNOTSUPP;
251 break;
252 case INVALID_CMD_TYPE:
253 error_msg = "Invalid command type";
254 ret = -EINVAL;
255 break;
256 case INVALID_DATA_SIZE:
257 error_msg = "Invalid data size";
258 ret = -EINVAL;
259 break;
260 case INVALID_CMD_PARAM:
261 error_msg = "Invalid command parameter";
262 ret = -EINVAL;
263 break;
264 case ENCRYP_CMD_REQUIRED:
265 error_msg = "Secure/encrypted command required";
266 ret = -EACCES;
267 break;
268 case NO_SECURE_SESSION:
269 error_msg = "No secure session established";
270 ret = -EACCES;
271 break;
272 case SECURE_SESSION_FOUND:
273 error_msg = "Secure session already established";
274 ret = -EACCES;
275 break;
276 case SECURE_SESSION_FAILED:
277 error_msg = "Secure session failed";
278 ret = -EIO;
279 break;
280 case AUTH_FAILED:
281 error_msg = "Other permission/Authentication failed";
282 ret = -EACCES;
283 break;
284 case INVALID_BIOS_AUTH:
285 error_msg = "Invalid BIOS administrator password";
286 ret = -EINVAL;
287 break;
288 case NONCE_DID_NOT_MATCH:
289 error_msg = "Nonce did not match";
290 ret = -EINVAL;
291 break;
292 case GENERIC_ERROR:
293 error_msg = "Generic/Other error";
294 ret = -EIO;
295 break;
296 case BIOS_ADMIN_POLICY_NOT_MET:
297 error_msg = "BIOS Admin password does not meet password policy requirements";
298 ret = -EINVAL;
299 break;
300 case BIOS_ADMIN_NOT_SET:
301 error_msg = "BIOS Setup password is not set";
302 ret = -EPERM;
303 break;
304 case P21_NO_PROVISIONED:
305 error_msg = "P21 is not provisioned";
306 ret = -EPERM;
307 break;
308 case P21_PROVISION_IN_PROGRESS:
309 error_msg = "P21 is already provisioned or provisioning is in progress and a signing key has already been sent";
310 ret = -EINPROGRESS;
311 break;
312 case P21_IN_USE:
313 error_msg = "P21 in use (cannot deprovision)";
314 ret = -EPERM;
315 break;
316 case HEP_NOT_ACTIVE:
317 error_msg = "HEP not activated";
318 ret = -EPERM;
319 break;
320 case HEP_ALREADY_SET:
321 error_msg = "HEP Transport already set";
322 ret = -EINVAL;
323 break;
324 case HEP_CHECK_STATE:
325 error_msg = "Check the current HEP state";
326 ret = -EINVAL;
327 break;
328 default:
329 error_msg = "Generic/Other error";
330 ret = -EIO;
331 break;
332 }
333
334 if (error_code)
335 pr_warn_ratelimited("Returned error 0x%x, \"%s\"\n", error_code, error_msg);
336
337 return ret;
338 }
339
pending_reboot_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)340 static ssize_t pending_reboot_show(struct kobject *kobj,
341 struct kobj_attribute *attr,
342 char *buf)
343 {
344 return sysfs_emit(buf, "%d\n", bioscfg_drv.pending_reboot);
345 }
346
347 static struct kobj_attribute pending_reboot = __ATTR_RO(pending_reboot);
348
349 /*
350 * create_attributes_level_sysfs_files() - Creates pending_reboot attributes
351 */
create_attributes_level_sysfs_files(void)352 static int create_attributes_level_sysfs_files(void)
353 {
354 return sysfs_create_file(&bioscfg_drv.main_dir_kset->kobj,
355 &pending_reboot.attr);
356 }
357
attr_name_release(struct kobject * kobj)358 static void attr_name_release(struct kobject *kobj)
359 {
360 kfree(kobj);
361 }
362
363 static const struct kobj_type attr_name_ktype = {
364 .release = attr_name_release,
365 .sysfs_ops = &kobj_sysfs_ops,
366 };
367
368 /**
369 * hp_get_wmiobj_pointer() - Get Content of WMI block for particular instance
370 *
371 * @instance_id: WMI instance ID
372 * @guid_string: WMI GUID (in str form)
373 *
374 * Fetches the content for WMI block (instance_id) under GUID (guid_string)
375 * Caller must kfree the return
376 */
hp_get_wmiobj_pointer(int instance_id,const char * guid_string)377 union acpi_object *hp_get_wmiobj_pointer(int instance_id, const char *guid_string)
378 {
379 struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
380 acpi_status status;
381
382 status = wmi_query_block(guid_string, instance_id, &out);
383 return ACPI_SUCCESS(status) ? (union acpi_object *)out.pointer : NULL;
384 }
385
386 /**
387 * hp_get_instance_count() - Compute total number of instances under guid_string
388 *
389 * @guid_string: WMI GUID (in string form)
390 */
hp_get_instance_count(const char * guid_string)391 int hp_get_instance_count(const char *guid_string)
392 {
393 int ret;
394
395 ret = wmi_instance_count(guid_string);
396 if (ret < 0)
397 return 0;
398
399 return ret;
400 }
401
402 /**
403 * hp_alloc_attributes_data() - Allocate attributes data for a particular type
404 *
405 * @attr_type: Attribute type to allocate
406 */
hp_alloc_attributes_data(int attr_type)407 static int hp_alloc_attributes_data(int attr_type)
408 {
409 switch (attr_type) {
410 case HPWMI_STRING_TYPE:
411 return hp_alloc_string_data();
412
413 case HPWMI_INTEGER_TYPE:
414 return hp_alloc_integer_data();
415
416 case HPWMI_ENUMERATION_TYPE:
417 return hp_alloc_enumeration_data();
418
419 case HPWMI_ORDERED_LIST_TYPE:
420 return hp_alloc_ordered_list_data();
421
422 case HPWMI_PASSWORD_TYPE:
423 return hp_alloc_password_data();
424
425 default:
426 return 0;
427 }
428 }
429
hp_convert_hexstr_to_str(const char * input,u32 input_len,char ** str,int * len)430 int hp_convert_hexstr_to_str(const char *input, u32 input_len, char **str, int *len)
431 {
432 int ret = 0;
433 int new_len = 0;
434 char tmp[] = "0x00";
435 char *new_str = NULL;
436 long ch;
437 int i;
438
439 if (input_len <= 0 || !input || !str || !len)
440 return -EINVAL;
441
442 *len = 0;
443 *str = NULL;
444
445 new_str = kmalloc(input_len, GFP_KERNEL);
446 if (!new_str)
447 return -ENOMEM;
448
449 for (i = 0; i < input_len; i += 5) {
450 strscpy(tmp, input + i);
451 if (kstrtol(tmp, 16, &ch) == 0) {
452 // escape char
453 if (ch == '\\' ||
454 ch == '\r' ||
455 ch == '\n' || ch == '\t') {
456 if (ch == '\r')
457 ch = 'r';
458 else if (ch == '\n')
459 ch = 'n';
460 else if (ch == '\t')
461 ch = 't';
462 new_str[new_len++] = '\\';
463 }
464 new_str[new_len++] = ch;
465 if (ch == '\0')
466 break;
467 }
468 }
469
470 if (new_len) {
471 new_str[new_len] = '\0';
472 *str = krealloc(new_str, (new_len + 1) * sizeof(char),
473 GFP_KERNEL);
474 if (*str)
475 *len = new_len;
476 else
477 ret = -ENOMEM;
478 } else {
479 ret = -EFAULT;
480 }
481
482 if (ret)
483 kfree(new_str);
484 return ret;
485 }
486
487 /* map output size to the corresponding WMI method id */
hp_encode_outsize_for_pvsz(int outsize)488 int hp_encode_outsize_for_pvsz(int outsize)
489 {
490 if (outsize > 4096)
491 return -EINVAL;
492 if (outsize > 1024)
493 return 5;
494 if (outsize > 128)
495 return 4;
496 if (outsize > 4)
497 return 3;
498 if (outsize > 0)
499 return 2;
500 return 1;
501 }
502
503 /*
504 * Update friendly display name for several attributes associated to
505 * 'Schedule Power-On'
506 */
hp_friendly_user_name_update(char * path,const char * attr_name,char * attr_display,int attr_size)507 void hp_friendly_user_name_update(char *path, const char *attr_name,
508 char *attr_display, int attr_size)
509 {
510 if (strstr(path, SCHEDULE_POWER_ON))
511 snprintf(attr_display, attr_size, "%s - %s", SCHEDULE_POWER_ON, attr_name);
512 else
513 strscpy(attr_display, attr_name, attr_size);
514 }
515
516 /**
517 * hp_update_attribute_permissions() - Update attributes permissions when
518 * isReadOnly value is 1
519 *
520 * @is_readonly: bool value to indicate if it a readonly attribute.
521 * @current_val: kobj_attribute corresponding to attribute.
522 *
523 */
hp_update_attribute_permissions(bool is_readonly,struct kobj_attribute * current_val)524 void hp_update_attribute_permissions(bool is_readonly, struct kobj_attribute *current_val)
525 {
526 current_val->attr.mode = is_readonly ? 0444 : 0644;
527 }
528
529 /**
530 * destroy_attribute_objs() - Free a kset of kobjects
531 * @kset: The kset to destroy
532 *
533 * Fress kobjects created for each attribute_name under attribute type kset
534 */
destroy_attribute_objs(struct kset * kset)535 static void destroy_attribute_objs(struct kset *kset)
536 {
537 struct kobject *pos, *next;
538
539 list_for_each_entry_safe(pos, next, &kset->list, entry)
540 kobject_put(pos);
541 }
542
543 /**
544 * release_attributes_data() - Clean-up all sysfs directories and files created
545 */
release_attributes_data(void)546 static void release_attributes_data(void)
547 {
548 mutex_lock(&bioscfg_drv.mutex);
549
550 hp_exit_string_attributes();
551 hp_exit_integer_attributes();
552 hp_exit_enumeration_attributes();
553 hp_exit_ordered_list_attributes();
554 hp_exit_password_attributes();
555 hp_exit_sure_start_attributes();
556 hp_exit_secure_platform_attributes();
557
558 if (bioscfg_drv.authentication_dir_kset) {
559 destroy_attribute_objs(bioscfg_drv.authentication_dir_kset);
560 kset_unregister(bioscfg_drv.authentication_dir_kset);
561 bioscfg_drv.authentication_dir_kset = NULL;
562 }
563 if (bioscfg_drv.main_dir_kset) {
564 sysfs_remove_file(&bioscfg_drv.main_dir_kset->kobj, &pending_reboot.attr);
565 destroy_attribute_objs(bioscfg_drv.main_dir_kset);
566 kset_unregister(bioscfg_drv.main_dir_kset);
567 bioscfg_drv.main_dir_kset = NULL;
568 }
569 mutex_unlock(&bioscfg_drv.mutex);
570 }
571
572 /**
573 * hp_add_other_attributes() - Initialize HP custom attributes not
574 * reported by BIOS and required to support Secure Platform and Sure
575 * Start.
576 *
577 * @attr_type: Custom HP attribute not reported by BIOS
578 *
579 * Initialize all 2 types of attributes: Platform and Sure Start
580 * object. Populates each attribute types respective properties
581 * under sysfs files.
582 *
583 * Returns zero(0) if successful. Otherwise, a negative value.
584 */
hp_add_other_attributes(int attr_type)585 static int hp_add_other_attributes(int attr_type)
586 {
587 struct kobject *attr_name_kobj;
588 int ret;
589 char *attr_name;
590
591 attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL);
592 if (!attr_name_kobj)
593 return -ENOMEM;
594
595 mutex_lock(&bioscfg_drv.mutex);
596
597 /* Check if attribute type is supported */
598 switch (attr_type) {
599 case HPWMI_SECURE_PLATFORM_TYPE:
600 attr_name_kobj->kset = bioscfg_drv.authentication_dir_kset;
601 attr_name = SPM_STR;
602 break;
603
604 case HPWMI_SURE_START_TYPE:
605 attr_name_kobj->kset = bioscfg_drv.main_dir_kset;
606 attr_name = SURE_START_STR;
607 break;
608
609 default:
610 pr_err("Error: Unknown attr_type: %d\n", attr_type);
611 ret = -EINVAL;
612 kfree(attr_name_kobj);
613 goto unlock_drv_mutex;
614 }
615
616 ret = kobject_init_and_add(attr_name_kobj, &attr_name_ktype,
617 NULL, "%s", attr_name);
618 if (ret) {
619 pr_err("Error encountered [%d]\n", ret);
620 goto err_other_attr_init;
621 }
622
623 /* Populate attribute data */
624 switch (attr_type) {
625 case HPWMI_SECURE_PLATFORM_TYPE:
626 ret = hp_populate_secure_platform_data(attr_name_kobj);
627 break;
628
629 case HPWMI_SURE_START_TYPE:
630 ret = hp_populate_sure_start_data(attr_name_kobj);
631 break;
632
633 default:
634 ret = -EINVAL;
635 }
636
637 if (ret)
638 goto err_other_attr_init;
639
640 mutex_unlock(&bioscfg_drv.mutex);
641 return 0;
642
643 err_other_attr_init:
644 kobject_put(attr_name_kobj);
645 unlock_drv_mutex:
646 mutex_unlock(&bioscfg_drv.mutex);
647 return ret;
648 }
649
hp_init_bios_package_attribute(enum hp_wmi_data_type attr_type,union acpi_object * obj,const char * guid,int min_elements,int instance_id)650 static int hp_init_bios_package_attribute(enum hp_wmi_data_type attr_type,
651 union acpi_object *obj,
652 const char *guid, int min_elements,
653 int instance_id)
654 {
655 struct kobject *attr_name_kobj, *duplicate;
656 union acpi_object *elements;
657 struct kset *temp_kset;
658
659 char *str_value = NULL;
660 int str_len;
661 int ret = 0;
662
663 /* Take action appropriate to each ACPI TYPE */
664 if (obj->package.count < min_elements) {
665 pr_err("ACPI-package does not have enough elements: %d < %d\n",
666 obj->package.count, min_elements);
667 goto pack_attr_exit;
668 }
669
670 elements = obj->package.elements;
671
672 /* sanity checking */
673 if (elements[NAME].type != ACPI_TYPE_STRING) {
674 pr_debug("incorrect element type\n");
675 goto pack_attr_exit;
676 }
677 if (strlen(elements[NAME].string.pointer) == 0) {
678 pr_debug("empty attribute found\n");
679 goto pack_attr_exit;
680 }
681
682 if (attr_type == HPWMI_PASSWORD_TYPE)
683 temp_kset = bioscfg_drv.authentication_dir_kset;
684 else
685 temp_kset = bioscfg_drv.main_dir_kset;
686
687 /* convert attribute name to string */
688 ret = hp_convert_hexstr_to_str(elements[NAME].string.pointer,
689 elements[NAME].string.length,
690 &str_value, &str_len);
691
692 if (ret) {
693 pr_debug("Failed to populate integer package data. Error [0%0x]\n",
694 ret);
695 kfree(str_value);
696 return ret;
697 }
698
699 if (!str_value || !str_value[0]) {
700 pr_debug("Ignoring attribute with empty name\n");
701 goto pack_attr_exit;
702 }
703
704 /* All duplicate attributes found are ignored */
705 duplicate = kset_find_obj(temp_kset, str_value);
706 if (duplicate) {
707 pr_debug("Duplicate attribute name found - %s\n", str_value);
708 /* kset_find_obj() returns a reference */
709 kobject_put(duplicate);
710 goto pack_attr_exit;
711 }
712
713 /* build attribute */
714 attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL);
715 if (!attr_name_kobj) {
716 ret = -ENOMEM;
717 goto pack_attr_exit;
718 }
719
720 attr_name_kobj->kset = temp_kset;
721
722 ret = kobject_init_and_add(attr_name_kobj, &attr_name_ktype,
723 NULL, "%s", str_value);
724
725 if (ret) {
726 kobject_put(attr_name_kobj);
727 goto pack_attr_exit;
728 }
729
730 /* enumerate all of these attributes */
731 switch (attr_type) {
732 case HPWMI_STRING_TYPE:
733 ret = hp_populate_string_package_data(elements,
734 instance_id,
735 attr_name_kobj);
736 break;
737 case HPWMI_INTEGER_TYPE:
738 ret = hp_populate_integer_package_data(elements,
739 instance_id,
740 attr_name_kobj);
741 break;
742 case HPWMI_ENUMERATION_TYPE:
743 ret = hp_populate_enumeration_package_data(elements,
744 instance_id,
745 attr_name_kobj);
746 break;
747 case HPWMI_ORDERED_LIST_TYPE:
748 ret = hp_populate_ordered_list_package_data(elements,
749 instance_id,
750 attr_name_kobj);
751 break;
752 case HPWMI_PASSWORD_TYPE:
753 ret = hp_populate_password_package_data(elements,
754 instance_id,
755 attr_name_kobj);
756 break;
757 default:
758 pr_debug("Unknown attribute type found: 0x%x\n", attr_type);
759 break;
760 }
761
762 pack_attr_exit:
763 kfree(str_value);
764 return ret;
765 }
766
hp_init_bios_buffer_attribute(enum hp_wmi_data_type attr_type,union acpi_object * obj,const char * guid,int min_elements,int instance_id)767 static int hp_init_bios_buffer_attribute(enum hp_wmi_data_type attr_type,
768 union acpi_object *obj,
769 const char *guid, int min_elements,
770 int instance_id)
771 {
772 struct kobject *attr_name_kobj, *duplicate;
773 struct kset *temp_kset;
774 char str[MAX_BUFF_SIZE];
775
776 char *temp_str = NULL;
777 char *str_value = NULL;
778 u8 *buffer_ptr = NULL;
779 int buffer_size;
780 int ret = 0;
781
782 buffer_size = obj->buffer.length;
783 buffer_ptr = obj->buffer.pointer;
784
785 ret = hp_get_string_from_buffer(&buffer_ptr,
786 &buffer_size, str, MAX_BUFF_SIZE);
787
788 if (ret < 0)
789 goto buff_attr_exit;
790
791 if (strlen(str) == 0) {
792 pr_debug("Ignoring attribute with empty name\n");
793 ret = 0;
794 goto buff_attr_exit;
795 }
796
797 if (attr_type == HPWMI_PASSWORD_TYPE ||
798 attr_type == HPWMI_SECURE_PLATFORM_TYPE)
799 temp_kset = bioscfg_drv.authentication_dir_kset;
800 else
801 temp_kset = bioscfg_drv.main_dir_kset;
802
803 /* All duplicate attributes found are ignored */
804 duplicate = kset_find_obj(temp_kset, str);
805 if (duplicate) {
806 pr_debug("Duplicate attribute name found - %s\n", str);
807 /* kset_find_obj() returns a reference */
808 kobject_put(duplicate);
809 goto buff_attr_exit;
810 }
811
812 /* build attribute */
813 attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL);
814 if (!attr_name_kobj) {
815 ret = -ENOMEM;
816 goto buff_attr_exit;
817 }
818
819 attr_name_kobj->kset = temp_kset;
820
821 temp_str = str;
822 if (attr_type == HPWMI_SECURE_PLATFORM_TYPE)
823 temp_str = "SPM";
824
825 ret = kobject_init_and_add(attr_name_kobj,
826 &attr_name_ktype, NULL, "%s", temp_str);
827 if (ret) {
828 kobject_put(attr_name_kobj);
829 goto buff_attr_exit;
830 }
831
832 /* enumerate all of these attributes */
833 switch (attr_type) {
834 case HPWMI_STRING_TYPE:
835 ret = hp_populate_string_buffer_data(buffer_ptr,
836 &buffer_size,
837 instance_id,
838 attr_name_kobj);
839 break;
840 case HPWMI_INTEGER_TYPE:
841 ret = hp_populate_integer_buffer_data(buffer_ptr,
842 &buffer_size,
843 instance_id,
844 attr_name_kobj);
845 break;
846 case HPWMI_ENUMERATION_TYPE:
847 ret = hp_populate_enumeration_buffer_data(buffer_ptr,
848 &buffer_size,
849 instance_id,
850 attr_name_kobj);
851 break;
852 case HPWMI_ORDERED_LIST_TYPE:
853 ret = hp_populate_ordered_list_buffer_data(buffer_ptr,
854 &buffer_size,
855 instance_id,
856 attr_name_kobj);
857 break;
858 case HPWMI_PASSWORD_TYPE:
859 ret = hp_populate_password_buffer_data(buffer_ptr,
860 &buffer_size,
861 instance_id,
862 attr_name_kobj);
863 break;
864 default:
865 pr_debug("Unknown attribute type found: 0x%x\n", attr_type);
866 break;
867 }
868
869 buff_attr_exit:
870 kfree(str_value);
871 return ret;
872 }
873
874 /**
875 * hp_init_bios_attributes() - Initialize all attributes for a type
876 * @attr_type: The attribute type to initialize
877 * @guid: The WMI GUID associated with this type to initialize
878 *
879 * Initialize all 5 types of attributes: enumeration, integer,
880 * string, password, ordered list object. Populates each attribute types
881 * respective properties under sysfs files
882 */
hp_init_bios_attributes(enum hp_wmi_data_type attr_type,const char * guid)883 static int hp_init_bios_attributes(enum hp_wmi_data_type attr_type, const char *guid)
884 {
885 union acpi_object *obj = NULL;
886 int min_elements;
887
888 /* instance_id needs to be reset for each type GUID
889 * also, instance IDs are unique within GUID but not across
890 */
891 int instance_id = 0;
892 int cur_instance_id = instance_id;
893 int ret = 0;
894
895 ret = hp_alloc_attributes_data(attr_type);
896 if (ret)
897 return ret;
898
899 switch (attr_type) {
900 case HPWMI_STRING_TYPE:
901 min_elements = STR_ELEM_CNT;
902 break;
903 case HPWMI_INTEGER_TYPE:
904 min_elements = INT_ELEM_CNT;
905 break;
906 case HPWMI_ENUMERATION_TYPE:
907 min_elements = ENUM_ELEM_CNT;
908 break;
909 case HPWMI_ORDERED_LIST_TYPE:
910 min_elements = ORD_ELEM_CNT;
911 break;
912 case HPWMI_PASSWORD_TYPE:
913 min_elements = PSWD_ELEM_CNT;
914 break;
915 default:
916 pr_err("Error: Unknown attr_type: %d\n", attr_type);
917 return -EINVAL;
918 }
919
920 /* need to use specific instance_id and guid combination to get right data */
921 obj = hp_get_wmiobj_pointer(instance_id, guid);
922 if (!obj)
923 return -ENODEV;
924
925 mutex_lock(&bioscfg_drv.mutex);
926 while (obj) {
927 /* Take action appropriate to each ACPI TYPE */
928 if (obj->type == ACPI_TYPE_PACKAGE) {
929 ret = hp_init_bios_package_attribute(attr_type, obj,
930 guid, min_elements,
931 cur_instance_id);
932
933 } else if (obj->type == ACPI_TYPE_BUFFER) {
934 ret = hp_init_bios_buffer_attribute(attr_type, obj,
935 guid, min_elements,
936 cur_instance_id);
937
938 } else {
939 pr_err("Expected ACPI-package or buffer type, got: %d\n",
940 obj->type);
941 ret = -EIO;
942 goto err_attr_init;
943 }
944
945 /*
946 * Failure reported in one attribute must not
947 * stop process of the remaining attribute values.
948 */
949 if (ret >= 0)
950 cur_instance_id++;
951
952 kfree(obj);
953 instance_id++;
954 obj = hp_get_wmiobj_pointer(instance_id, guid);
955 }
956
957 err_attr_init:
958 mutex_unlock(&bioscfg_drv.mutex);
959 kfree(obj);
960 return ret;
961 }
962
hp_init(void)963 static int __init hp_init(void)
964 {
965 int ret;
966 int hp_bios_capable = wmi_has_guid(HP_WMI_BIOS_GUID);
967 int set_bios_settings = wmi_has_guid(HP_WMI_SET_BIOS_SETTING_GUID);
968
969 if (!hp_bios_capable) {
970 pr_err("Unable to run on non-HP system\n");
971 return -ENODEV;
972 }
973
974 if (!set_bios_settings) {
975 pr_err("Unable to set BIOS settings on HP systems\n");
976 return -ENODEV;
977 }
978
979 ret = hp_init_attr_set_interface();
980 if (ret)
981 return ret;
982
983 bioscfg_drv.class_dev = device_create(&firmware_attributes_class, NULL, MKDEV(0, 0),
984 NULL, "%s", DRIVER_NAME);
985 if (IS_ERR(bioscfg_drv.class_dev)) {
986 ret = PTR_ERR(bioscfg_drv.class_dev);
987 goto err_unregister_class;
988 }
989
990 bioscfg_drv.main_dir_kset = kset_create_and_add("attributes", NULL,
991 &bioscfg_drv.class_dev->kobj);
992 if (!bioscfg_drv.main_dir_kset) {
993 ret = -ENOMEM;
994 pr_debug("Failed to create and add attributes\n");
995 goto err_destroy_classdev;
996 }
997
998 bioscfg_drv.authentication_dir_kset = kset_create_and_add("authentication", NULL,
999 &bioscfg_drv.class_dev->kobj);
1000 if (!bioscfg_drv.authentication_dir_kset) {
1001 ret = -ENOMEM;
1002 pr_debug("Failed to create and add authentication\n");
1003 goto err_release_attributes_data;
1004 }
1005
1006 /*
1007 * sysfs level attributes.
1008 * - pending_reboot
1009 */
1010 ret = create_attributes_level_sysfs_files();
1011 if (ret)
1012 pr_debug("Failed to create sysfs level attributes\n");
1013
1014 ret = hp_init_bios_attributes(HPWMI_STRING_TYPE, HP_WMI_BIOS_STRING_GUID);
1015 if (ret)
1016 pr_debug("Failed to populate string type attributes\n");
1017
1018 ret = hp_init_bios_attributes(HPWMI_INTEGER_TYPE, HP_WMI_BIOS_INTEGER_GUID);
1019 if (ret)
1020 pr_debug("Failed to populate integer type attributes\n");
1021
1022 ret = hp_init_bios_attributes(HPWMI_ENUMERATION_TYPE, HP_WMI_BIOS_ENUMERATION_GUID);
1023 if (ret)
1024 pr_debug("Failed to populate enumeration type attributes\n");
1025
1026 ret = hp_init_bios_attributes(HPWMI_ORDERED_LIST_TYPE, HP_WMI_BIOS_ORDERED_LIST_GUID);
1027 if (ret)
1028 pr_debug("Failed to populate ordered list object type attributes\n");
1029
1030 ret = hp_init_bios_attributes(HPWMI_PASSWORD_TYPE, HP_WMI_BIOS_PASSWORD_GUID);
1031 if (ret)
1032 pr_debug("Failed to populate password object type attributes\n");
1033
1034 bioscfg_drv.spm_data.attr_name_kobj = NULL;
1035 ret = hp_add_other_attributes(HPWMI_SECURE_PLATFORM_TYPE);
1036 if (ret)
1037 pr_debug("Failed to populate secure platform object type attribute\n");
1038
1039 bioscfg_drv.sure_start_attr_kobj = NULL;
1040 ret = hp_add_other_attributes(HPWMI_SURE_START_TYPE);
1041 if (ret)
1042 pr_debug("Failed to populate sure start object type attribute\n");
1043
1044 return 0;
1045
1046 err_release_attributes_data:
1047 release_attributes_data();
1048
1049 err_destroy_classdev:
1050 device_unregister(bioscfg_drv.class_dev);
1051
1052 err_unregister_class:
1053 hp_exit_attr_set_interface();
1054
1055 return ret;
1056 }
1057
hp_exit(void)1058 static void __exit hp_exit(void)
1059 {
1060 release_attributes_data();
1061 device_unregister(bioscfg_drv.class_dev);
1062
1063 hp_exit_attr_set_interface();
1064 }
1065
1066 module_init(hp_init);
1067 module_exit(hp_exit);
1068