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
11enum int_properties {MIN_VALUE = 6, MAX_VALUE, SCALAR_INCR};
12
13get_instance_id(integer);
14
15static 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 */
42static 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
63attribute_s_property_show(display_name_language_code, integer);
64static struct kobj_attribute integer_displ_langcode =
65	__ATTR_RO(display_name_language_code);
66
67attribute_s_property_show(display_name, integer);
68static struct kobj_attribute integer_displ_name =
69	__ATTR_RO(display_name);
70
71attribute_n_property_show(default_value, integer);
72static struct kobj_attribute integer_default_val =
73	__ATTR_RO(default_value);
74
75attribute_property_store(current_value, integer);
76static struct kobj_attribute integer_current_val =
77	__ATTR_RW_MODE(current_value, 0600);
78
79attribute_s_property_show(dell_modifier, integer);
80static struct kobj_attribute integer_modifier =
81	__ATTR_RO(dell_modifier);
82
83attribute_n_property_show(min_value, integer);
84static struct kobj_attribute integer_lower_bound =
85	__ATTR_RO(min_value);
86
87attribute_n_property_show(max_value, integer);
88static struct kobj_attribute integer_upper_bound =
89	__ATTR_RO(max_value);
90
91attribute_n_property_show(scalar_increment, integer);
92static struct kobj_attribute integer_scalar_increment =
93	__ATTR_RO(scalar_increment);
94
95static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
96			 char *buf)
97{
98	return sprintf(buf, "integer\n");
99}
100static struct kobj_attribute integer_type =
101	__ATTR_RO(type);
102
103static 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
116static const struct attribute_group integer_attr_group = {
117	.attrs = integer_attrs,
118};
119
120int 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 */
140int 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 */
185void 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