xref: /linux/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c (revision 2375843b50d6139b82648499daaad2034576905b)
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 
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  */
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 
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 
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  */
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 	strlcpy_attr(wmi_priv.integer_data[instance_id].attribute_name,
145 		integer_obj[ATTR_NAME].string.pointer);
146 	strlcpy_attr(wmi_priv.integer_data[instance_id].display_name_language_code,
147 		integer_obj[DISPL_NAME_LANG_CODE].string.pointer);
148 	strlcpy_attr(wmi_priv.integer_data[instance_id].display_name,
149 		integer_obj[DISPLAY_NAME].string.pointer);
150 	wmi_priv.integer_data[instance_id].default_value =
151 		(uintptr_t)integer_obj[DEFAULT_VAL].string.pointer;
152 	strlcpy_attr(wmi_priv.integer_data[instance_id].dell_modifier,
153 		integer_obj[MODIFIER].string.pointer);
154 	wmi_priv.integer_data[instance_id].min_value =
155 		(uintptr_t)integer_obj[MIN_VALUE].string.pointer;
156 	wmi_priv.integer_data[instance_id].max_value =
157 		(uintptr_t)integer_obj[MAX_VALUE].string.pointer;
158 	wmi_priv.integer_data[instance_id].scalar_increment =
159 		(uintptr_t)integer_obj[SCALAR_INCR].string.pointer;
160 
161 	return sysfs_create_group(attr_name_kobj, &integer_attr_group);
162 }
163 
164 /**
165  * exit_int_attributes() - Clear all attribute data
166  *
167  * Clears all data allocated for this group of attributes
168  */
169 void exit_int_attributes(void)
170 {
171 	int instance_id;
172 
173 	for (instance_id = 0; instance_id < wmi_priv.integer_instances_count; instance_id++) {
174 		if (wmi_priv.integer_data[instance_id].attr_name_kobj)
175 			sysfs_remove_group(wmi_priv.integer_data[instance_id].attr_name_kobj,
176 								&integer_attr_group);
177 	}
178 	wmi_priv.integer_instances_count = 0;
179 
180 	kfree(wmi_priv.integer_data);
181 	wmi_priv.integer_data = NULL;
182 }
183