xref: /linux/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
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/wmi.h>
14 #include "bioscfg.h"
15 #include "../../firmware_attributes_class.h"
16 #include <linux/nls.h>
17 #include <linux/errno.h>
18 
19 MODULE_AUTHOR("Jorge Lopez <jorge.lopez2@hp.com>");
20 MODULE_DESCRIPTION("HP BIOS Configuration Driver");
21 MODULE_LICENSE("GPL");
22 
23 struct bioscfg_priv bioscfg_drv = {
24 	.mutex = __MUTEX_INITIALIZER(bioscfg_drv.mutex),
25 };
26 
27 static const struct class *fw_attr_class;
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 	union acpi_object *wmi_obj = NULL;
394 	int i = 0;
395 
396 	do {
397 		kfree(wmi_obj);
398 		wmi_obj = hp_get_wmiobj_pointer(i, guid_string);
399 		i++;
400 	} while (wmi_obj);
401 
402 	return i - 1;
403 }
404 
405 /**
406  * hp_alloc_attributes_data() - Allocate attributes data for a particular type
407  *
408  * @attr_type: Attribute type to allocate
409  */
hp_alloc_attributes_data(int attr_type)410 static int hp_alloc_attributes_data(int attr_type)
411 {
412 	switch (attr_type) {
413 	case HPWMI_STRING_TYPE:
414 		return hp_alloc_string_data();
415 
416 	case HPWMI_INTEGER_TYPE:
417 		return hp_alloc_integer_data();
418 
419 	case HPWMI_ENUMERATION_TYPE:
420 		return hp_alloc_enumeration_data();
421 
422 	case HPWMI_ORDERED_LIST_TYPE:
423 		return hp_alloc_ordered_list_data();
424 
425 	case HPWMI_PASSWORD_TYPE:
426 		return hp_alloc_password_data();
427 
428 	default:
429 		return 0;
430 	}
431 }
432 
hp_convert_hexstr_to_str(const char * input,u32 input_len,char ** str,int * len)433 int hp_convert_hexstr_to_str(const char *input, u32 input_len, char **str, int *len)
434 {
435 	int ret = 0;
436 	int new_len = 0;
437 	char tmp[] = "0x00";
438 	char *new_str = NULL;
439 	long  ch;
440 	int i;
441 
442 	if (input_len <= 0 || !input || !str || !len)
443 		return -EINVAL;
444 
445 	*len = 0;
446 	*str = NULL;
447 
448 	new_str = kmalloc(input_len, GFP_KERNEL);
449 	if (!new_str)
450 		return -ENOMEM;
451 
452 	for (i = 0; i < input_len; i += 5) {
453 		strncpy(tmp, input + i, strlen(tmp));
454 		if (kstrtol(tmp, 16, &ch) == 0) {
455 			// escape char
456 			if (ch == '\\' ||
457 			    ch == '\r' ||
458 			    ch == '\n' || ch == '\t') {
459 				if (ch == '\r')
460 					ch = 'r';
461 				else if (ch == '\n')
462 					ch = 'n';
463 				else if (ch == '\t')
464 					ch = 't';
465 				new_str[new_len++] = '\\';
466 			}
467 			new_str[new_len++] = ch;
468 			if (ch == '\0')
469 				break;
470 		}
471 	}
472 
473 	if (new_len) {
474 		new_str[new_len] = '\0';
475 		*str = krealloc(new_str, (new_len + 1) * sizeof(char),
476 				GFP_KERNEL);
477 		if (*str)
478 			*len = new_len;
479 		else
480 			ret = -ENOMEM;
481 	} else {
482 		ret = -EFAULT;
483 	}
484 
485 	if (ret)
486 		kfree(new_str);
487 	return ret;
488 }
489 
490 /* map output size to the corresponding WMI method id */
hp_encode_outsize_for_pvsz(int outsize)491 int hp_encode_outsize_for_pvsz(int outsize)
492 {
493 	if (outsize > 4096)
494 		return -EINVAL;
495 	if (outsize > 1024)
496 		return 5;
497 	if (outsize > 128)
498 		return 4;
499 	if (outsize > 4)
500 		return 3;
501 	if (outsize > 0)
502 		return 2;
503 	return 1;
504 }
505 
506 /*
507  * Update friendly display name for several attributes associated to
508  * 'Schedule Power-On'
509  */
hp_friendly_user_name_update(char * path,const char * attr_name,char * attr_display,int attr_size)510 void hp_friendly_user_name_update(char *path, const char *attr_name,
511 				  char *attr_display, int attr_size)
512 {
513 	if (strstr(path, SCHEDULE_POWER_ON))
514 		snprintf(attr_display, attr_size, "%s - %s", SCHEDULE_POWER_ON, attr_name);
515 	else
516 		strscpy(attr_display, attr_name, attr_size);
517 }
518 
519 /**
520  * hp_update_attribute_permissions() - Update attributes permissions when
521  * isReadOnly value is 1
522  *
523  * @is_readonly:  bool value to indicate if it a readonly attribute.
524  * @current_val: kobj_attribute corresponding to attribute.
525  *
526  */
hp_update_attribute_permissions(bool is_readonly,struct kobj_attribute * current_val)527 void hp_update_attribute_permissions(bool is_readonly, struct kobj_attribute *current_val)
528 {
529 	current_val->attr.mode = is_readonly ? 0444 : 0644;
530 }
531 
532 /**
533  * destroy_attribute_objs() - Free a kset of kobjects
534  * @kset: The kset to destroy
535  *
536  * Fress kobjects created for each attribute_name under attribute type kset
537  */
destroy_attribute_objs(struct kset * kset)538 static void destroy_attribute_objs(struct kset *kset)
539 {
540 	struct kobject *pos, *next;
541 
542 	list_for_each_entry_safe(pos, next, &kset->list, entry)
543 		kobject_put(pos);
544 }
545 
546 /**
547  * release_attributes_data() - Clean-up all sysfs directories and files created
548  */
release_attributes_data(void)549 static void release_attributes_data(void)
550 {
551 	mutex_lock(&bioscfg_drv.mutex);
552 
553 	hp_exit_string_attributes();
554 	hp_exit_integer_attributes();
555 	hp_exit_enumeration_attributes();
556 	hp_exit_ordered_list_attributes();
557 	hp_exit_password_attributes();
558 	hp_exit_sure_start_attributes();
559 	hp_exit_secure_platform_attributes();
560 
561 	if (bioscfg_drv.authentication_dir_kset) {
562 		destroy_attribute_objs(bioscfg_drv.authentication_dir_kset);
563 		kset_unregister(bioscfg_drv.authentication_dir_kset);
564 		bioscfg_drv.authentication_dir_kset = NULL;
565 	}
566 	if (bioscfg_drv.main_dir_kset) {
567 		sysfs_remove_file(&bioscfg_drv.main_dir_kset->kobj, &pending_reboot.attr);
568 		destroy_attribute_objs(bioscfg_drv.main_dir_kset);
569 		kset_unregister(bioscfg_drv.main_dir_kset);
570 		bioscfg_drv.main_dir_kset = NULL;
571 	}
572 	mutex_unlock(&bioscfg_drv.mutex);
573 }
574 
575 /**
576  * hp_add_other_attributes() - Initialize HP custom attributes not
577  * reported by BIOS and required to support Secure Platform and Sure
578  * Start.
579  *
580  * @attr_type: Custom HP attribute not reported by BIOS
581  *
582  * Initialize all 2 types of attributes: Platform and Sure Start
583  * object.  Populates each attribute types respective properties
584  * under sysfs files.
585  *
586  * Returns zero(0) if successful. Otherwise, a negative value.
587  */
hp_add_other_attributes(int attr_type)588 static int hp_add_other_attributes(int attr_type)
589 {
590 	struct kobject *attr_name_kobj;
591 	int ret;
592 	char *attr_name;
593 
594 	attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL);
595 	if (!attr_name_kobj)
596 		return -ENOMEM;
597 
598 	mutex_lock(&bioscfg_drv.mutex);
599 
600 	/* Check if attribute type is supported */
601 	switch (attr_type) {
602 	case HPWMI_SECURE_PLATFORM_TYPE:
603 		attr_name_kobj->kset = bioscfg_drv.authentication_dir_kset;
604 		attr_name = SPM_STR;
605 		break;
606 
607 	case HPWMI_SURE_START_TYPE:
608 		attr_name_kobj->kset = bioscfg_drv.main_dir_kset;
609 		attr_name = SURE_START_STR;
610 		break;
611 
612 	default:
613 		pr_err("Error: Unknown attr_type: %d\n", attr_type);
614 		ret = -EINVAL;
615 		kfree(attr_name_kobj);
616 		goto unlock_drv_mutex;
617 	}
618 
619 	ret = kobject_init_and_add(attr_name_kobj, &attr_name_ktype,
620 				   NULL, "%s", attr_name);
621 	if (ret) {
622 		pr_err("Error encountered [%d]\n", ret);
623 		goto err_other_attr_init;
624 	}
625 
626 	/* Populate attribute data */
627 	switch (attr_type) {
628 	case HPWMI_SECURE_PLATFORM_TYPE:
629 		ret = hp_populate_secure_platform_data(attr_name_kobj);
630 		break;
631 
632 	case HPWMI_SURE_START_TYPE:
633 		ret = hp_populate_sure_start_data(attr_name_kobj);
634 		break;
635 
636 	default:
637 		ret = -EINVAL;
638 	}
639 
640 	if (ret)
641 		goto err_other_attr_init;
642 
643 	mutex_unlock(&bioscfg_drv.mutex);
644 	return 0;
645 
646 err_other_attr_init:
647 	kobject_put(attr_name_kobj);
648 unlock_drv_mutex:
649 	mutex_unlock(&bioscfg_drv.mutex);
650 	return ret;
651 }
652 
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)653 static int hp_init_bios_package_attribute(enum hp_wmi_data_type attr_type,
654 					  union acpi_object *obj,
655 					  const char *guid, int min_elements,
656 					  int instance_id)
657 {
658 	struct kobject *attr_name_kobj, *duplicate;
659 	union acpi_object *elements;
660 	struct kset *temp_kset;
661 
662 	char *str_value = NULL;
663 	int str_len;
664 	int ret = 0;
665 
666 	/* Take action appropriate to each ACPI TYPE */
667 	if (obj->package.count < min_elements) {
668 		pr_err("ACPI-package does not have enough elements: %d < %d\n",
669 		       obj->package.count, min_elements);
670 		goto pack_attr_exit;
671 	}
672 
673 	elements = obj->package.elements;
674 
675 	/* sanity checking */
676 	if (elements[NAME].type != ACPI_TYPE_STRING) {
677 		pr_debug("incorrect element type\n");
678 		goto pack_attr_exit;
679 	}
680 	if (strlen(elements[NAME].string.pointer) == 0) {
681 		pr_debug("empty attribute found\n");
682 		goto pack_attr_exit;
683 	}
684 
685 	if (attr_type == HPWMI_PASSWORD_TYPE)
686 		temp_kset = bioscfg_drv.authentication_dir_kset;
687 	else
688 		temp_kset = bioscfg_drv.main_dir_kset;
689 
690 	/* convert attribute name to string */
691 	ret = hp_convert_hexstr_to_str(elements[NAME].string.pointer,
692 				       elements[NAME].string.length,
693 				       &str_value, &str_len);
694 
695 	if (ret) {
696 		pr_debug("Failed to populate integer package data. Error [0%0x]\n",
697 			 ret);
698 		kfree(str_value);
699 		return ret;
700 	}
701 
702 	/* All duplicate attributes found are ignored */
703 	duplicate = kset_find_obj(temp_kset, str_value);
704 	if (duplicate) {
705 		pr_debug("Duplicate attribute name found - %s\n", str_value);
706 		/* kset_find_obj() returns a reference */
707 		kobject_put(duplicate);
708 		goto pack_attr_exit;
709 	}
710 
711 	/* build attribute */
712 	attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL);
713 	if (!attr_name_kobj) {
714 		ret = -ENOMEM;
715 		goto pack_attr_exit;
716 	}
717 
718 	attr_name_kobj->kset = temp_kset;
719 
720 	ret = kobject_init_and_add(attr_name_kobj, &attr_name_ktype,
721 				   NULL, "%s", str_value);
722 
723 	if (ret) {
724 		kobject_put(attr_name_kobj);
725 		goto pack_attr_exit;
726 	}
727 
728 	/* enumerate all of these attributes */
729 	switch (attr_type) {
730 	case HPWMI_STRING_TYPE:
731 		ret = hp_populate_string_package_data(elements,
732 						      instance_id,
733 						      attr_name_kobj);
734 		break;
735 	case HPWMI_INTEGER_TYPE:
736 		ret = hp_populate_integer_package_data(elements,
737 						       instance_id,
738 						       attr_name_kobj);
739 		break;
740 	case HPWMI_ENUMERATION_TYPE:
741 		ret = hp_populate_enumeration_package_data(elements,
742 							   instance_id,
743 							   attr_name_kobj);
744 		break;
745 	case HPWMI_ORDERED_LIST_TYPE:
746 		ret = hp_populate_ordered_list_package_data(elements,
747 							    instance_id,
748 							    attr_name_kobj);
749 		break;
750 	case HPWMI_PASSWORD_TYPE:
751 		ret = hp_populate_password_package_data(elements,
752 							instance_id,
753 							attr_name_kobj);
754 		break;
755 	default:
756 		pr_debug("Unknown attribute type found: 0x%x\n", attr_type);
757 		break;
758 	}
759 
760 pack_attr_exit:
761 	kfree(str_value);
762 	return ret;
763 }
764 
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)765 static int hp_init_bios_buffer_attribute(enum hp_wmi_data_type attr_type,
766 					 union acpi_object *obj,
767 					 const char *guid, int min_elements,
768 					 int instance_id)
769 {
770 	struct kobject *attr_name_kobj, *duplicate;
771 	struct kset *temp_kset;
772 	char str[MAX_BUFF_SIZE];
773 
774 	char *temp_str = NULL;
775 	char *str_value = NULL;
776 	u8 *buffer_ptr = NULL;
777 	int buffer_size;
778 	int ret = 0;
779 
780 	buffer_size = obj->buffer.length;
781 	buffer_ptr = obj->buffer.pointer;
782 
783 	ret = hp_get_string_from_buffer(&buffer_ptr,
784 					&buffer_size, str, MAX_BUFF_SIZE);
785 
786 	if (ret < 0)
787 		goto buff_attr_exit;
788 
789 	if (attr_type == HPWMI_PASSWORD_TYPE ||
790 	    attr_type == HPWMI_SECURE_PLATFORM_TYPE)
791 		temp_kset = bioscfg_drv.authentication_dir_kset;
792 	else
793 		temp_kset = bioscfg_drv.main_dir_kset;
794 
795 	/* All duplicate attributes found are ignored */
796 	duplicate = kset_find_obj(temp_kset, str);
797 	if (duplicate) {
798 		pr_debug("Duplicate attribute name found - %s\n", str);
799 		/* kset_find_obj() returns a reference */
800 		kobject_put(duplicate);
801 		goto buff_attr_exit;
802 	}
803 
804 	/* build attribute */
805 	attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL);
806 	if (!attr_name_kobj) {
807 		ret = -ENOMEM;
808 		goto buff_attr_exit;
809 	}
810 
811 	attr_name_kobj->kset = temp_kset;
812 
813 	temp_str = str;
814 	if (attr_type == HPWMI_SECURE_PLATFORM_TYPE)
815 		temp_str = "SPM";
816 
817 	ret = kobject_init_and_add(attr_name_kobj,
818 				   &attr_name_ktype, NULL, "%s", temp_str);
819 	if (ret) {
820 		kobject_put(attr_name_kobj);
821 		goto buff_attr_exit;
822 	}
823 
824 	/* enumerate all of these attributes */
825 	switch (attr_type) {
826 	case HPWMI_STRING_TYPE:
827 		ret = hp_populate_string_buffer_data(buffer_ptr,
828 						     &buffer_size,
829 						     instance_id,
830 						     attr_name_kobj);
831 		break;
832 	case HPWMI_INTEGER_TYPE:
833 		ret = hp_populate_integer_buffer_data(buffer_ptr,
834 						      &buffer_size,
835 						      instance_id,
836 						      attr_name_kobj);
837 		break;
838 	case HPWMI_ENUMERATION_TYPE:
839 		ret = hp_populate_enumeration_buffer_data(buffer_ptr,
840 							  &buffer_size,
841 							  instance_id,
842 							  attr_name_kobj);
843 		break;
844 	case HPWMI_ORDERED_LIST_TYPE:
845 		ret = hp_populate_ordered_list_buffer_data(buffer_ptr,
846 							   &buffer_size,
847 							   instance_id,
848 							   attr_name_kobj);
849 		break;
850 	case HPWMI_PASSWORD_TYPE:
851 		ret = hp_populate_password_buffer_data(buffer_ptr,
852 						       &buffer_size,
853 						       instance_id,
854 						       attr_name_kobj);
855 		break;
856 	default:
857 		pr_debug("Unknown attribute type found: 0x%x\n", attr_type);
858 		break;
859 	}
860 
861 buff_attr_exit:
862 	kfree(str_value);
863 	return ret;
864 }
865 
866 /**
867  * hp_init_bios_attributes() - Initialize all attributes for a type
868  * @attr_type: The attribute type to initialize
869  * @guid: The WMI GUID associated with this type to initialize
870  *
871  * Initialize all 5 types of attributes: enumeration, integer,
872  * string, password, ordered list  object.  Populates each attribute types
873  * respective properties under sysfs files
874  */
hp_init_bios_attributes(enum hp_wmi_data_type attr_type,const char * guid)875 static int hp_init_bios_attributes(enum hp_wmi_data_type attr_type, const char *guid)
876 {
877 	union acpi_object *obj = NULL;
878 	int min_elements;
879 
880 	/* instance_id needs to be reset for each type GUID
881 	 * also, instance IDs are unique within GUID but not across
882 	 */
883 	int instance_id = 0;
884 	int cur_instance_id = instance_id;
885 	int ret = 0;
886 
887 	ret = hp_alloc_attributes_data(attr_type);
888 	if (ret)
889 		return ret;
890 
891 	switch (attr_type) {
892 	case HPWMI_STRING_TYPE:
893 		min_elements = STR_ELEM_CNT;
894 		break;
895 	case HPWMI_INTEGER_TYPE:
896 		min_elements = INT_ELEM_CNT;
897 		break;
898 	case HPWMI_ENUMERATION_TYPE:
899 		min_elements = ENUM_ELEM_CNT;
900 		break;
901 	case HPWMI_ORDERED_LIST_TYPE:
902 		min_elements = ORD_ELEM_CNT;
903 		break;
904 	case HPWMI_PASSWORD_TYPE:
905 		min_elements = PSWD_ELEM_CNT;
906 		break;
907 	default:
908 		pr_err("Error: Unknown attr_type: %d\n", attr_type);
909 		return -EINVAL;
910 	}
911 
912 	/* need to use specific instance_id and guid combination to get right data */
913 	obj = hp_get_wmiobj_pointer(instance_id, guid);
914 	if (!obj)
915 		return -ENODEV;
916 
917 	mutex_lock(&bioscfg_drv.mutex);
918 	while (obj) {
919 		/* Take action appropriate to each ACPI TYPE */
920 		if (obj->type == ACPI_TYPE_PACKAGE) {
921 			ret = hp_init_bios_package_attribute(attr_type, obj,
922 							     guid, min_elements,
923 							     cur_instance_id);
924 
925 		} else if (obj->type == ACPI_TYPE_BUFFER) {
926 			ret = hp_init_bios_buffer_attribute(attr_type, obj,
927 							    guid, min_elements,
928 							    cur_instance_id);
929 
930 		} else {
931 			pr_err("Expected ACPI-package or buffer type, got: %d\n",
932 			       obj->type);
933 			ret = -EIO;
934 			goto err_attr_init;
935 		}
936 
937 		/*
938 		 * Failure reported in one attribute must not
939 		 * stop process of the remaining attribute values.
940 		 */
941 		if (ret >= 0)
942 			cur_instance_id++;
943 
944 		kfree(obj);
945 		instance_id++;
946 		obj = hp_get_wmiobj_pointer(instance_id, guid);
947 	}
948 
949 err_attr_init:
950 	mutex_unlock(&bioscfg_drv.mutex);
951 	kfree(obj);
952 	return ret;
953 }
954 
hp_init(void)955 static int __init hp_init(void)
956 {
957 	int ret;
958 	int hp_bios_capable = wmi_has_guid(HP_WMI_BIOS_GUID);
959 	int set_bios_settings = wmi_has_guid(HP_WMI_SET_BIOS_SETTING_GUID);
960 
961 	if (!hp_bios_capable) {
962 		pr_err("Unable to run on non-HP system\n");
963 		return -ENODEV;
964 	}
965 
966 	if (!set_bios_settings) {
967 		pr_err("Unable to set BIOS settings on HP systems\n");
968 		return -ENODEV;
969 	}
970 
971 	ret = hp_init_attr_set_interface();
972 	if (ret)
973 		return ret;
974 
975 	ret = fw_attributes_class_get(&fw_attr_class);
976 	if (ret)
977 		goto err_unregister_class;
978 
979 	bioscfg_drv.class_dev = device_create(fw_attr_class, NULL, MKDEV(0, 0),
980 					      NULL, "%s", DRIVER_NAME);
981 	if (IS_ERR(bioscfg_drv.class_dev)) {
982 		ret = PTR_ERR(bioscfg_drv.class_dev);
983 		goto err_unregister_class;
984 	}
985 
986 	bioscfg_drv.main_dir_kset = kset_create_and_add("attributes", NULL,
987 							&bioscfg_drv.class_dev->kobj);
988 	if (!bioscfg_drv.main_dir_kset) {
989 		ret = -ENOMEM;
990 		pr_debug("Failed to create and add attributes\n");
991 		goto err_destroy_classdev;
992 	}
993 
994 	bioscfg_drv.authentication_dir_kset = kset_create_and_add("authentication", NULL,
995 								  &bioscfg_drv.class_dev->kobj);
996 	if (!bioscfg_drv.authentication_dir_kset) {
997 		ret = -ENOMEM;
998 		pr_debug("Failed to create and add authentication\n");
999 		goto err_release_attributes_data;
1000 	}
1001 
1002 	/*
1003 	 * sysfs level attributes.
1004 	 * - pending_reboot
1005 	 */
1006 	ret = create_attributes_level_sysfs_files();
1007 	if (ret)
1008 		pr_debug("Failed to create sysfs level attributes\n");
1009 
1010 	ret = hp_init_bios_attributes(HPWMI_STRING_TYPE, HP_WMI_BIOS_STRING_GUID);
1011 	if (ret)
1012 		pr_debug("Failed to populate string type attributes\n");
1013 
1014 	ret = hp_init_bios_attributes(HPWMI_INTEGER_TYPE, HP_WMI_BIOS_INTEGER_GUID);
1015 	if (ret)
1016 		pr_debug("Failed to populate integer type attributes\n");
1017 
1018 	ret = hp_init_bios_attributes(HPWMI_ENUMERATION_TYPE, HP_WMI_BIOS_ENUMERATION_GUID);
1019 	if (ret)
1020 		pr_debug("Failed to populate enumeration type attributes\n");
1021 
1022 	ret = hp_init_bios_attributes(HPWMI_ORDERED_LIST_TYPE, HP_WMI_BIOS_ORDERED_LIST_GUID);
1023 	if (ret)
1024 		pr_debug("Failed to populate ordered list object type attributes\n");
1025 
1026 	ret = hp_init_bios_attributes(HPWMI_PASSWORD_TYPE, HP_WMI_BIOS_PASSWORD_GUID);
1027 	if (ret)
1028 		pr_debug("Failed to populate password object type attributes\n");
1029 
1030 	bioscfg_drv.spm_data.attr_name_kobj = NULL;
1031 	ret = hp_add_other_attributes(HPWMI_SECURE_PLATFORM_TYPE);
1032 	if (ret)
1033 		pr_debug("Failed to populate secure platform object type attribute\n");
1034 
1035 	bioscfg_drv.sure_start_attr_kobj = NULL;
1036 	ret = hp_add_other_attributes(HPWMI_SURE_START_TYPE);
1037 	if (ret)
1038 		pr_debug("Failed to populate sure start object type attribute\n");
1039 
1040 	return 0;
1041 
1042 err_release_attributes_data:
1043 	release_attributes_data();
1044 
1045 err_destroy_classdev:
1046 	device_destroy(fw_attr_class, MKDEV(0, 0));
1047 
1048 err_unregister_class:
1049 	fw_attributes_class_put();
1050 	hp_exit_attr_set_interface();
1051 
1052 	return ret;
1053 }
1054 
hp_exit(void)1055 static void __exit hp_exit(void)
1056 {
1057 	release_attributes_data();
1058 	device_destroy(fw_attr_class, MKDEV(0, 0));
1059 
1060 	fw_attributes_class_put();
1061 	hp_exit_attr_set_interface();
1062 }
1063 
1064 module_init(hp_init);
1065 module_exit(hp_exit);
1066