1 /* SPDX-License-Identifier: GPL-2.0
2  * Definitions for kernel modules using Dell WMI System Management Driver
3  *
4  *  Copyright (c) 2020 Dell Inc.
5  */
6 
7 #ifndef _DELL_WMI_BIOS_ATTR_H_
8 #define _DELL_WMI_BIOS_ATTR_H_
9 
10 #include <linux/wmi.h>
11 #include <linux/device.h>
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/capability.h>
15 
16 #define DRIVER_NAME					"dell-wmi-sysman"
17 #define MAX_BUFF  512
18 
19 #define DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID	"F1DDEE52-063C-4784-A11E-8A06684B9BF5"
20 #define DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID		"F1DDEE52-063C-4784-A11E-8A06684B9BFA"
21 #define DELL_WMI_BIOS_STRING_ATTRIBUTE_GUID		"F1DDEE52-063C-4784-A11E-8A06684B9BF9"
22 #define DELL_WMI_BIOS_PASSOBJ_ATTRIBUTE_GUID		"0894B8D6-44A6-4719-97D7-6AD24108BFD4"
23 #define DELL_WMI_BIOS_ATTRIBUTES_INTERFACE_GUID		"F1DDEE52-063C-4784-A11E-8A06684B9BF4"
24 #define DELL_WMI_BIOS_PASSWORD_INTERFACE_GUID		"70FE8229-D03B-4214-A1C6-1F884B1A892A"
25 
26 struct enumeration_data {
27 	struct kobject *attr_name_kobj;
28 	char display_name_language_code[MAX_BUFF];
29 	char dell_value_modifier[MAX_BUFF];
30 	char possible_values[MAX_BUFF];
31 	char attribute_name[MAX_BUFF];
32 	char default_value[MAX_BUFF];
33 	char dell_modifier[MAX_BUFF];
34 	char display_name[MAX_BUFF];
35 };
36 
37 struct integer_data {
38 	struct kobject *attr_name_kobj;
39 	char display_name_language_code[MAX_BUFF];
40 	char attribute_name[MAX_BUFF];
41 	char dell_modifier[MAX_BUFF];
42 	char display_name[MAX_BUFF];
43 	int scalar_increment;
44 	int default_value;
45 	int min_value;
46 	int max_value;
47 };
48 
49 struct str_data {
50 	struct kobject *attr_name_kobj;
51 	char display_name_language_code[MAX_BUFF];
52 	char attribute_name[MAX_BUFF];
53 	char display_name[MAX_BUFF];
54 	char default_value[MAX_BUFF];
55 	char dell_modifier[MAX_BUFF];
56 	int min_length;
57 	int max_length;
58 };
59 
60 struct po_data {
61 	struct kobject *attr_name_kobj;
62 	char attribute_name[MAX_BUFF];
63 	int min_password_length;
64 	int max_password_length;
65 };
66 
67 struct wmi_sysman_priv {
68 	char current_admin_password[MAX_BUFF];
69 	char current_system_password[MAX_BUFF];
70 	struct wmi_device *password_attr_wdev;
71 	struct wmi_device *bios_attr_wdev;
72 	struct kset *authentication_dir_kset;
73 	struct kset *main_dir_kset;
74 	struct device *class_dev;
75 	struct enumeration_data *enumeration_data;
76 	int enumeration_instances_count;
77 	struct integer_data *integer_data;
78 	int integer_instances_count;
79 	struct str_data *str_data;
80 	int str_instances_count;
81 	struct po_data *po_data;
82 	int po_instances_count;
83 	bool pending_changes;
84 	struct mutex mutex;
85 };
86 
87 /* global structure used by multiple WMI interfaces */
88 extern struct wmi_sysman_priv wmi_priv;
89 
90 enum { ENUM, INT, STR, PO };
91 
92 enum {
93 	ATTR_NAME,
94 	DISPL_NAME_LANG_CODE,
95 	DISPLAY_NAME,
96 	DEFAULT_VAL,
97 	CURRENT_VAL,
98 	MODIFIER
99 };
100 
101 #define get_instance_id(type)							\
102 static int get_##type##_instance_id(struct kobject *kobj)			\
103 {										\
104 	int i;									\
105 	for (i = 0; i <= wmi_priv.type##_instances_count; i++) {		\
106 		if (!(strcmp(kobj->name, wmi_priv.type##_data[i].attribute_name)))\
107 			return i;						\
108 	}									\
109 	return -EIO;								\
110 }
111 
112 #define attribute_s_property_show(name, type)					\
113 static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr,	\
114 			   char *buf)						\
115 {										\
116 	int i = get_##type##_instance_id(kobj);					\
117 	if (i >= 0)								\
118 		return sprintf(buf, "%s\n", wmi_priv.type##_data[i].name);	\
119 	return 0;								\
120 }
121 
122 #define attribute_n_property_show(name, type)					\
123 static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr,	\
124 			   char *buf)						\
125 {										\
126 	int i = get_##type##_instance_id(kobj);					\
127 	if (i >= 0)								\
128 		return sprintf(buf, "%d\n", wmi_priv.type##_data[i].name);	\
129 	return 0;								\
130 }
131 
132 #define attribute_property_store(curr_val, type)				\
133 static ssize_t curr_val##_store(struct kobject *kobj,				\
134 				struct kobj_attribute *attr,			\
135 				const char *buf, size_t count)			\
136 {										\
137 	char *p, *buf_cp;							\
138 	int i, ret = -EIO;							\
139 	buf_cp = kstrdup(buf, GFP_KERNEL);					\
140 	if (!buf_cp)								\
141 		return -ENOMEM;							\
142 	p = memchr(buf_cp, '\n', count);					\
143 										\
144 	if (p != NULL)								\
145 		*p = '\0';							\
146 	i = get_##type##_instance_id(kobj);					\
147 	if (i >= 0)								\
148 		ret = validate_##type##_input(i, buf_cp);			\
149 	if (!ret)								\
150 		ret = set_attribute(kobj->name, buf_cp);			\
151 	kfree(buf_cp);								\
152 	return ret ? ret : count;						\
153 }
154 
155 #define check_property_type(attr, prop, valuetype)				\
156 	(attr##_obj[prop].type != valuetype)
157 
158 union acpi_object *get_wmiobj_pointer(int instance_id, const char *guid_string);
159 int get_instance_count(const char *guid_string);
160 void strlcpy_attr(char *dest, char *src);
161 
162 int populate_enum_data(union acpi_object *enumeration_obj, int instance_id,
163 			struct kobject *attr_name_kobj, u32 enum_property_count);
164 int alloc_enum_data(void);
165 void exit_enum_attributes(void);
166 
167 int populate_int_data(union acpi_object *integer_obj, int instance_id,
168 			struct kobject *attr_name_kobj);
169 int alloc_int_data(void);
170 void exit_int_attributes(void);
171 
172 int populate_str_data(union acpi_object *str_obj, int instance_id, struct kobject *attr_name_kobj);
173 int alloc_str_data(void);
174 void exit_str_attributes(void);
175 
176 int populate_po_data(union acpi_object *po_obj, int instance_id, struct kobject *attr_name_kobj);
177 int alloc_po_data(void);
178 void exit_po_attributes(void);
179 
180 int set_attribute(const char *a_name, const char *a_value);
181 int set_bios_defaults(u8 defType);
182 
183 void exit_bios_attr_set_interface(void);
184 int init_bios_attr_set_interface(void);
185 int map_wmi_error(int error_code);
186 size_t calculate_string_buffer(const char *str);
187 size_t calculate_security_buffer(char *authentication);
188 void populate_security_buffer(char *buffer, char *authentication);
189 ssize_t populate_string_buffer(char *buffer, size_t buffer_len, const char *str);
190 int set_new_password(const char *password_type, const char *new);
191 int init_bios_attr_pass_interface(void);
192 void exit_bios_attr_pass_interface(void);
193 
194 #endif
195