1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Functions corresponding to enumeration type attributes under
  4 * BIOS Enumeration GUID for use with dell-wmi-sysman
  5 *
  6 *  Copyright (c) 2020 Dell Inc.
  7 */
  8
  9#include "dell-wmi-sysman.h"
 10
 11get_instance_id(enumeration);
 12
 13static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
 14{
 15	int instance_id = get_enumeration_instance_id(kobj);
 16	union acpi_object *obj;
 17	ssize_t ret;
 18
 19	if (instance_id < 0)
 20		return instance_id;
 21
 22	/* need to use specific instance_id and guid combination to get right data */
 23	obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID);
 24	if (!obj)
 25		return -EIO;
 26	if (obj->package.elements[CURRENT_VAL].type != ACPI_TYPE_STRING) {
 27		kfree(obj);
 28		return -EINVAL;
 29	}
 30	ret = snprintf(buf, PAGE_SIZE, "%s\n", obj->package.elements[CURRENT_VAL].string.pointer);
 31	kfree(obj);
 32	return ret;
 33}
 34
 35/**
 36 * validate_enumeration_input() - Validate input of current_value against possible values
 37 * @instance_id: The instance on which input is validated
 38 * @buf: Input value
 39 */
 40static int validate_enumeration_input(int instance_id, const char *buf)
 41{
 42	char *options, *tmp, *p;
 43	int ret = -EINVAL;
 44
 45	options = tmp = kstrdup(wmi_priv.enumeration_data[instance_id].possible_values,
 46				 GFP_KERNEL);
 47	if (!options)
 48		return -ENOMEM;
 49
 50	while ((p = strsep(&options, ";")) != NULL) {
 51		if (!*p)
 52			continue;
 53		if (!strcasecmp(p, buf)) {
 54			ret = 0;
 55			break;
 56		}
 57	}
 58
 59	kfree(tmp);
 60	return ret;
 61}
 62
 63attribute_s_property_show(display_name_language_code, enumeration);
 64static struct kobj_attribute displ_langcode =
 65		__ATTR_RO(display_name_language_code);
 66
 67attribute_s_property_show(display_name, enumeration);
 68static struct kobj_attribute displ_name =
 69		__ATTR_RO(display_name);
 70
 71attribute_s_property_show(default_value, enumeration);
 72static struct kobj_attribute default_val =
 73		__ATTR_RO(default_value);
 74
 75attribute_property_store(current_value, enumeration);
 76static struct kobj_attribute current_val =
 77		__ATTR_RW_MODE(current_value, 0600);
 78
 79attribute_s_property_show(dell_modifier, enumeration);
 80static struct kobj_attribute modifier =
 81		__ATTR_RO(dell_modifier);
 82
 83attribute_s_property_show(dell_value_modifier, enumeration);
 84static struct kobj_attribute value_modfr =
 85		__ATTR_RO(dell_value_modifier);
 86
 87attribute_s_property_show(possible_values, enumeration);
 88static struct kobj_attribute poss_val =
 89		__ATTR_RO(possible_values);
 90
 91static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
 92			 char *buf)
 93{
 94	return sprintf(buf, "enumeration\n");
 95}
 96static struct kobj_attribute type =
 97		__ATTR_RO(type);
 98
 99static struct attribute *enumeration_attrs[] = {
100	&displ_langcode.attr,
101	&displ_name.attr,
102	&default_val.attr,
103	&current_val.attr,
104	&modifier.attr,
105	&value_modfr.attr,
106	&poss_val.attr,
107	&type.attr,
108	NULL,
109};
110
111static const struct attribute_group enumeration_attr_group = {
112	.attrs = enumeration_attrs,
113};
114
115int alloc_enum_data(void)
116{
117	int ret = 0;
118
119	wmi_priv.enumeration_instances_count =
120		get_instance_count(DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID);
121	wmi_priv.enumeration_data = kcalloc(wmi_priv.enumeration_instances_count,
122					sizeof(struct enumeration_data), GFP_KERNEL);
123	if (!wmi_priv.enumeration_data) {
124		wmi_priv.enumeration_instances_count = 0;
125		ret = -ENOMEM;
126	}
127	return ret;
128}
129
130/**
131 * populate_enum_data() - Populate all properties of an instance under enumeration attribute
132 * @enumeration_obj: ACPI object with enumeration data
133 * @instance_id: The instance to enumerate
134 * @attr_name_kobj: The parent kernel object
135 * @enum_property_count: Total properties count under enumeration type
136 */
137int populate_enum_data(union acpi_object *enumeration_obj, int instance_id,
138			struct kobject *attr_name_kobj, u32 enum_property_count)
139{
140	int i, next_obj, value_modifier_count, possible_values_count;
141
142	wmi_priv.enumeration_data[instance_id].attr_name_kobj = attr_name_kobj;
143	if (check_property_type(enumeration, ATTR_NAME, ACPI_TYPE_STRING))
144		return -EINVAL;
145	strlcpy_attr(wmi_priv.enumeration_data[instance_id].attribute_name,
146		enumeration_obj[ATTR_NAME].string.pointer);
147	if (check_property_type(enumeration, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING))
148		return -EINVAL;
149	strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name_language_code,
150		enumeration_obj[DISPL_NAME_LANG_CODE].string.pointer);
151	if (check_property_type(enumeration, DISPLAY_NAME, ACPI_TYPE_STRING))
152		return -EINVAL;
153	strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name,
154		enumeration_obj[DISPLAY_NAME].string.pointer);
155	if (check_property_type(enumeration, DEFAULT_VAL, ACPI_TYPE_STRING))
156		return -EINVAL;
157	strlcpy_attr(wmi_priv.enumeration_data[instance_id].default_value,
158		enumeration_obj[DEFAULT_VAL].string.pointer);
159	if (check_property_type(enumeration, MODIFIER, ACPI_TYPE_STRING))
160		return -EINVAL;
161	strlcpy_attr(wmi_priv.enumeration_data[instance_id].dell_modifier,
162		enumeration_obj[MODIFIER].string.pointer);
163
164	next_obj = MODIFIER + 1;
165
166	if (next_obj >= enum_property_count)
167		return -EINVAL;
168
169	if (check_property_type(enumeration, next_obj, ACPI_TYPE_INTEGER))
170		return -EINVAL;
171	value_modifier_count = (uintptr_t)enumeration_obj[next_obj++].string.pointer;
172
173	for (i = 0; i < value_modifier_count; i++) {
174		if (next_obj >= enum_property_count)
175			return -EINVAL;
176		if (check_property_type(enumeration, next_obj, ACPI_TYPE_STRING))
177			return -EINVAL;
178		strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier,
179			enumeration_obj[next_obj++].string.pointer);
180		strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier, ";");
181	}
182
183	if (next_obj >= enum_property_count)
184		return -EINVAL;
185
186	if (check_property_type(enumeration, next_obj, ACPI_TYPE_INTEGER))
187		return -EINVAL;
188	possible_values_count = (uintptr_t) enumeration_obj[next_obj++].string.pointer;
189
190	for (i = 0; i < possible_values_count; i++) {
191		if (next_obj >= enum_property_count)
192			return -EINVAL;
193		if (check_property_type(enumeration, next_obj, ACPI_TYPE_STRING))
194			return -EINVAL;
195		strcat(wmi_priv.enumeration_data[instance_id].possible_values,
196			enumeration_obj[next_obj++].string.pointer);
197		strcat(wmi_priv.enumeration_data[instance_id].possible_values, ";");
198	}
199
200	return sysfs_create_group(attr_name_kobj, &enumeration_attr_group);
201}
202
203/**
204 * exit_enum_attributes() - Clear all attribute data
205 *
206 * Clears all data allocated for this group of attributes
207 */
208void exit_enum_attributes(void)
209{
210	int instance_id;
211
212	for (instance_id = 0; instance_id < wmi_priv.enumeration_instances_count; instance_id++) {
213		if (wmi_priv.enumeration_data[instance_id].attr_name_kobj)
214			sysfs_remove_group(wmi_priv.enumeration_data[instance_id].attr_name_kobj,
215								&enumeration_attr_group);
216	}
217	wmi_priv.enumeration_instances_count = 0;
218
219	kfree(wmi_priv.enumeration_data);
220	wmi_priv.enumeration_data = NULL;
221}