summaryrefslogtreecommitdiff
path: root/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c
blob: 80f4b7785c6c9ad9de93f62a79388008a461ba12 (plain)
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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
// SPDX-License-Identifier: GPL-2.0
/*
 * Functions corresponding to enumeration type attributes under
 * BIOS Enumeration GUID for use with dell-wmi-sysman
 *
 *  Copyright (c) 2020 Dell Inc.
 */

#include "dell-wmi-sysman.h"

get_instance_id(enumeration);

static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
	int instance_id = get_enumeration_instance_id(kobj);
	union acpi_object *obj;
	ssize_t ret;

	if (instance_id < 0)
		return instance_id;

	/* need to use specific instance_id and guid combination to get right data */
	obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_ENUMERATION_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_enumeration_input() - Validate input of current_value against possible values
 * @instance_id: The instance on which input is validated
 * @buf: Input value
 */
static int validate_enumeration_input(int instance_id, const char *buf)
{
	char *options, *tmp, *p;
	int ret = -EINVAL;

	options = tmp = kstrdup(wmi_priv.enumeration_data[instance_id].possible_values,
				 GFP_KERNEL);
	if (!options)
		return -ENOMEM;

	while ((p = strsep(&options, ";")) != NULL) {
		if (!*p)
			continue;
		if (!strcasecmp(p, buf)) {
			ret = 0;
			break;
		}
	}

	kfree(tmp);
	return ret;
}

attribute_s_property_show(display_name_language_code, enumeration);
static struct kobj_attribute displ_langcode =
		__ATTR_RO(display_name_language_code);

attribute_s_property_show(display_name, enumeration);
static struct kobj_attribute displ_name =
		__ATTR_RO(display_name);

attribute_s_property_show(default_value, enumeration);
static struct kobj_attribute default_val =
		__ATTR_RO(default_value);

attribute_property_store(current_value, enumeration);
static struct kobj_attribute current_val =
		__ATTR_RW_MODE(current_value, 0600);

attribute_s_property_show(dell_modifier, enumeration);
static struct kobj_attribute modifier =
		__ATTR_RO(dell_modifier);

attribute_s_property_show(dell_value_modifier, enumeration);
static struct kobj_attribute value_modfr =
		__ATTR_RO(dell_value_modifier);

attribute_s_property_show(possible_values, enumeration);
static struct kobj_attribute poss_val =
		__ATTR_RO(possible_values);

static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
			 char *buf)
{
	return sprintf(buf, "enumeration\n");
}
static struct kobj_attribute type =
		__ATTR_RO(type);

static struct attribute *enumeration_attrs[] = {
	&displ_langcode.attr,
	&displ_name.attr,
	&default_val.attr,
	&current_val.attr,
	&modifier.attr,
	&value_modfr.attr,
	&poss_val.attr,
	&type.attr,
	NULL,
};

static const struct attribute_group enumeration_attr_group = {
	.attrs = enumeration_attrs,
};

int alloc_enum_data(void)
{
	int ret = 0;

	wmi_priv.enumeration_instances_count =
		get_instance_count(DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID);
	wmi_priv.enumeration_data = kcalloc(wmi_priv.enumeration_instances_count,
					sizeof(struct enumeration_data), GFP_KERNEL);
	if (!wmi_priv.enumeration_data) {
		wmi_priv.enumeration_instances_count = 0;
		ret = -ENOMEM;
	}
	return ret;
}

/**
 * populate_enum_data() - Populate all properties of an instance under enumeration attribute
 * @enumeration_obj: ACPI object with enumeration data
 * @instance_id: The instance to enumerate
 * @attr_name_kobj: The parent kernel object
 */
int populate_enum_data(union acpi_object *enumeration_obj, int instance_id,
			struct kobject *attr_name_kobj)
{
	int i, next_obj, value_modifier_count, possible_values_count;

	wmi_priv.enumeration_data[instance_id].attr_name_kobj = attr_name_kobj;
	strlcpy_attr(wmi_priv.enumeration_data[instance_id].attribute_name,
		enumeration_obj[ATTR_NAME].string.pointer);
	strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name_language_code,
		enumeration_obj[DISPL_NAME_LANG_CODE].string.pointer);
	strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name,
		enumeration_obj[DISPLAY_NAME].string.pointer);
	strlcpy_attr(wmi_priv.enumeration_data[instance_id].default_value,
		enumeration_obj[DEFAULT_VAL].string.pointer);
	strlcpy_attr(wmi_priv.enumeration_data[instance_id].dell_modifier,
		enumeration_obj[MODIFIER].string.pointer);

	next_obj = MODIFIER + 1;

	value_modifier_count = (uintptr_t)enumeration_obj[next_obj].string.pointer;

	for (i = 0; i < value_modifier_count; i++) {
		strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier,
			enumeration_obj[++next_obj].string.pointer);
		strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier, ";");
	}

	possible_values_count = (uintptr_t) enumeration_obj[++next_obj].string.pointer;

	for (i = 0; i < possible_values_count; i++) {
		strcat(wmi_priv.enumeration_data[instance_id].possible_values,
			enumeration_obj[++next_obj].string.pointer);
		strcat(wmi_priv.enumeration_data[instance_id].possible_values, ";");
	}

	return sysfs_create_group(attr_name_kobj, &enumeration_attr_group);
}

/**
 * exit_enum_attributes() - Clear all attribute data
 *
 * Clears all data allocated for this group of attributes
 */
void exit_enum_attributes(void)
{
	int instance_id;

	for (instance_id = 0; instance_id < wmi_priv.enumeration_instances_count; instance_id++) {
		if (wmi_priv.enumeration_data[instance_id].attr_name_kobj)
			sysfs_remove_group(wmi_priv.enumeration_data[instance_id].attr_name_kobj,
								&enumeration_attr_group);
	}
	kfree(wmi_priv.enumeration_data);
}