1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
// SPDX-License-Identifier: GPL-2.0
/*
* Functions corresponding to string type attributes under BIOS String GUID for use with
* dell-wmi-sysman
*
* Copyright (c) 2020 Dell Inc.
*/
#include "dell-wmi-sysman.h"
enum string_properties {MIN_LEN = 6, MAX_LEN};
get_instance_id(str);
static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
int instance_id = get_str_instance_id(kobj);
union acpi_object *obj;
ssize_t ret;
if (instance_id < 0)
return -EIO;
/* need to use specific instance_id and guid combination to get right data */
obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_STRING_ATTRIBUTE_GUID);
if (!obj)
return -EIO;
if (obj->package.elements[CURRENT_VAL].type != ACPI_TYPE_STRING) {
kfree(obj);
return -EINVAL;
}
ret = snprintf(buf, PAGE_SIZE, "%s\n", obj->package.elements[CURRENT_VAL].string.pointer);
kfree(obj);
return ret;
}
/**
* validate_str_input() - Validate input of current_value against min and max lengths
* @instance_id: The instance on which input is validated
* @buf: Input value
*/
static int validate_str_input(int instance_id, const char *buf)
{
int in_len = strlen(buf);
if ((in_len < wmi_priv.str_data[instance_id].min_length) ||
(in_len > wmi_priv.str_data[instance_id].max_length))
return -EINVAL;
return 0;
}
attribute_s_property_show(display_name_language_code, str);
static struct kobj_attribute str_displ_langcode =
__ATTR_RO(display_name_language_code);
attribute_s_property_show(display_name, str);
static struct kobj_attribute str_displ_name =
__ATTR_RO(display_name);
attribute_s_property_show(default_value, str);
static struct kobj_attribute str_default_val =
__ATTR_RO(default_value);
attribute_property_store(current_value, str);
static struct kobj_attribute str_current_val =
__ATTR_RW_MODE(current_value, 0600);
attribute_s_property_show(dell_modifier, str);
static struct kobj_attribute str_modifier =
__ATTR_RO(dell_modifier);
attribute_n_property_show(min_length, str);
static struct kobj_attribute str_min_length =
__ATTR_RO(min_length);
attribute_n_property_show(max_length, str);
static struct kobj_attribute str_max_length =
__ATTR_RO(max_length);
static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "string\n");
}
static struct kobj_attribute str_type =
__ATTR_RO(type);
static struct attribute *str_attrs[] = {
&str_displ_langcode.attr,
&str_displ_name.attr,
&str_default_val.attr,
&str_current_val.attr,
&str_modifier.attr,
&str_min_length.attr,
&str_max_length.attr,
&str_type.attr,
NULL,
};
static const struct attribute_group str_attr_group = {
.attrs = str_attrs,
};
int alloc_str_data(void)
{
int ret = 0;
wmi_priv.str_instances_count = get_instance_count(DELL_WMI_BIOS_STRING_ATTRIBUTE_GUID);
wmi_priv.str_data = kcalloc(wmi_priv.str_instances_count,
sizeof(struct str_data), GFP_KERNEL);
if (!wmi_priv.str_data) {
wmi_priv.str_instances_count = 0;
ret = -ENOMEM;
}
return ret;
}
/**
* populate_str_data() - Populate all properties of an instance under string attribute
* @str_obj: ACPI object with integer data
* @instance_id: The instance to enumerate
* @attr_name_kobj: The parent kernel object
*/
int populate_str_data(union acpi_object *str_obj, int instance_id, struct kobject *attr_name_kobj)
{
wmi_priv.str_data[instance_id].attr_name_kobj = attr_name_kobj;
strlcpy_attr(wmi_priv.str_data[instance_id].attribute_name,
str_obj[ATTR_NAME].string.pointer);
strlcpy_attr(wmi_priv.str_data[instance_id].display_name_language_code,
str_obj[DISPL_NAME_LANG_CODE].string.pointer);
strlcpy_attr(wmi_priv.str_data[instance_id].display_name,
str_obj[DISPLAY_NAME].string.pointer);
strlcpy_attr(wmi_priv.str_data[instance_id].default_value,
str_obj[DEFAULT_VAL].string.pointer);
strlcpy_attr(wmi_priv.str_data[instance_id].dell_modifier,
str_obj[MODIFIER].string.pointer);
wmi_priv.str_data[instance_id].min_length = (uintptr_t)str_obj[MIN_LEN].string.pointer;
wmi_priv.str_data[instance_id].max_length = (uintptr_t) str_obj[MAX_LEN].string.pointer;
return sysfs_create_group(attr_name_kobj, &str_attr_group);
}
/**
* exit_str_attributes() - Clear all attribute data
*
* Clears all data allocated for this group of attributes
*/
void exit_str_attributes(void)
{
int instance_id;
for (instance_id = 0; instance_id < wmi_priv.str_instances_count; instance_id++) {
if (wmi_priv.str_data[instance_id].attr_name_kobj)
sysfs_remove_group(wmi_priv.str_data[instance_id].attr_name_kobj,
&str_attr_group);
}
kfree(wmi_priv.str_data);
}
|
