1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Functions corresponding to integer type attributes under BIOS Integer GUID for use with
4 * dell-wmi-sysman
5 *
6 * Copyright (c) 2020 Dell Inc.
7 */
8
9 #include "dell-wmi-sysman.h"
10
11 enum int_properties {MIN_VALUE = 6, MAX_VALUE, SCALAR_INCR};
12
13 get_instance_id(integer);
14
current_value_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)15 static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
16 {
17 int instance_id = get_integer_instance_id(kobj);
18 union acpi_object *obj;
19 ssize_t ret;
20
21 if (instance_id < 0)
22 return instance_id;
23
24 /* need to use specific instance_id and guid combination to get right data */
25 obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID);
26 if (!obj)
27 return -EIO;
28 if (obj->package.elements[CURRENT_VAL].type != ACPI_TYPE_INTEGER) {
29 kfree(obj);
30 return -EINVAL;
31 }
32 ret = snprintf(buf, PAGE_SIZE, "%lld\n", obj->package.elements[CURRENT_VAL].integer.value);
33 kfree(obj);
34 return ret;
35 }
36
37 /**
38 * validate_integer_input() - Validate input of current_value against lower and upper bound
39 * @instance_id: The instance on which input is validated
40 * @buf: Input value
41 */
validate_integer_input(int instance_id,char * buf)42 static int validate_integer_input(int instance_id, char *buf)
43 {
44 int in_val;
45 int ret;
46
47 ret = kstrtoint(buf, 0, &in_val);
48 if (ret)
49 return ret;
50 if (in_val < wmi_priv.integer_data[instance_id].min_value ||
51 in_val > wmi_priv.integer_data[instance_id].max_value)
52 return -EINVAL;
53
54 /* workaround for BIOS error.
55 * validate input to avoid setting 0 when integer input passed with + sign
56 */
57 if (*buf == '+')
58 memmove(buf, (buf + 1), strlen(buf + 1) + 1);
59
60 return ret;
61 }
62
63 attribute_s_property_show(display_name_language_code, integer);
64 static struct kobj_attribute integer_displ_langcode =
65 __ATTR_RO(display_name_language_code);
66
67 attribute_s_property_show(display_name, integer);
68 static struct kobj_attribute integer_displ_name =
69 __ATTR_RO(display_name);
70
71 attribute_n_property_show(default_value, integer);
72 static struct kobj_attribute integer_default_val =
73 __ATTR_RO(default_value);
74
75 attribute_property_store(current_value, integer);
76 static struct kobj_attribute integer_current_val =
77 __ATTR_RW_MODE(current_value, 0600);
78
79 attribute_s_property_show(dell_modifier, integer);
80 static struct kobj_attribute integer_modifier =
81 __ATTR_RO(dell_modifier);
82
83 attribute_n_property_show(min_value, integer);
84 static struct kobj_attribute integer_lower_bound =
85 __ATTR_RO(min_value);
86
87 attribute_n_property_show(max_value, integer);
88 static struct kobj_attribute integer_upper_bound =
89 __ATTR_RO(max_value);
90
91 attribute_n_property_show(scalar_increment, integer);
92 static struct kobj_attribute integer_scalar_increment =
93 __ATTR_RO(scalar_increment);
94
type_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)95 static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
96 char *buf)
97 {
98 return sprintf(buf, "integer\n");
99 }
100 static struct kobj_attribute integer_type =
101 __ATTR_RO(type);
102
103 static struct attribute *integer_attrs[] = {
104 &integer_displ_langcode.attr,
105 &integer_displ_name.attr,
106 &integer_default_val.attr,
107 &integer_current_val.attr,
108 &integer_modifier.attr,
109 &integer_lower_bound.attr,
110 &integer_upper_bound.attr,
111 &integer_scalar_increment.attr,
112 &integer_type.attr,
113 NULL,
114 };
115
116 static const struct attribute_group integer_attr_group = {
117 .attrs = integer_attrs,
118 };
119
alloc_int_data(void)120 int alloc_int_data(void)
121 {
122 int ret = 0;
123
124 wmi_priv.integer_instances_count = get_instance_count(DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID);
125 wmi_priv.integer_data = kcalloc(wmi_priv.integer_instances_count,
126 sizeof(struct integer_data), GFP_KERNEL);
127 if (!wmi_priv.integer_data) {
128 wmi_priv.integer_instances_count = 0;
129 ret = -ENOMEM;
130 }
131 return ret;
132 }
133
134 /**
135 * populate_int_data() - Populate all properties of an instance under integer attribute
136 * @integer_obj: ACPI object with integer data
137 * @instance_id: The instance to enumerate
138 * @attr_name_kobj: The parent kernel object
139 */
populate_int_data(union acpi_object * integer_obj,int instance_id,struct kobject * attr_name_kobj)140 int populate_int_data(union acpi_object *integer_obj, int instance_id,
141 struct kobject *attr_name_kobj)
142 {
143 wmi_priv.integer_data[instance_id].attr_name_kobj = attr_name_kobj;
144 if (check_property_type(integer, ATTR_NAME, ACPI_TYPE_STRING))
145 return -EINVAL;
146 strlcpy_attr(wmi_priv.integer_data[instance_id].attribute_name,
147 integer_obj[ATTR_NAME].string.pointer);
148 if (check_property_type(integer, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING))
149 return -EINVAL;
150 strlcpy_attr(wmi_priv.integer_data[instance_id].display_name_language_code,
151 integer_obj[DISPL_NAME_LANG_CODE].string.pointer);
152 if (check_property_type(integer, DISPLAY_NAME, ACPI_TYPE_STRING))
153 return -EINVAL;
154 strlcpy_attr(wmi_priv.integer_data[instance_id].display_name,
155 integer_obj[DISPLAY_NAME].string.pointer);
156 if (check_property_type(integer, DEFAULT_VAL, ACPI_TYPE_INTEGER))
157 return -EINVAL;
158 wmi_priv.integer_data[instance_id].default_value =
159 (uintptr_t)integer_obj[DEFAULT_VAL].string.pointer;
160 if (check_property_type(integer, MODIFIER, ACPI_TYPE_STRING))
161 return -EINVAL;
162 strlcpy_attr(wmi_priv.integer_data[instance_id].dell_modifier,
163 integer_obj[MODIFIER].string.pointer);
164 if (check_property_type(integer, MIN_VALUE, ACPI_TYPE_INTEGER))
165 return -EINVAL;
166 wmi_priv.integer_data[instance_id].min_value =
167 (uintptr_t)integer_obj[MIN_VALUE].string.pointer;
168 if (check_property_type(integer, MAX_VALUE, ACPI_TYPE_INTEGER))
169 return -EINVAL;
170 wmi_priv.integer_data[instance_id].max_value =
171 (uintptr_t)integer_obj[MAX_VALUE].string.pointer;
172 if (check_property_type(integer, SCALAR_INCR, ACPI_TYPE_INTEGER))
173 return -EINVAL;
174 wmi_priv.integer_data[instance_id].scalar_increment =
175 (uintptr_t)integer_obj[SCALAR_INCR].string.pointer;
176
177 return sysfs_create_group(attr_name_kobj, &integer_attr_group);
178 }
179
180 /**
181 * exit_int_attributes() - Clear all attribute data
182 *
183 * Clears all data allocated for this group of attributes
184 */
exit_int_attributes(void)185 void exit_int_attributes(void)
186 {
187 int instance_id;
188
189 for (instance_id = 0; instance_id < wmi_priv.integer_instances_count; instance_id++) {
190 if (wmi_priv.integer_data[instance_id].attr_name_kobj)
191 sysfs_remove_group(wmi_priv.integer_data[instance_id].attr_name_kobj,
192 &integer_attr_group);
193 }
194 wmi_priv.integer_instances_count = 0;
195
196 kfree(wmi_priv.integer_data);
197 wmi_priv.integer_data = NULL;
198 }
199