222 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Functions corresponding to enumeration type attributes under4 * BIOS Enumeration GUID for use with dell-wmi-sysman5 *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 values37 * @instance_id: The instance on which input is validated38 * @buf: Input value39 */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 ¤t_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 attribute132 * @enumeration_obj: ACPI object with enumeration data133 * @instance_id: The instance to enumerate134 * @attr_name_kobj: The parent kernel object135 * @enum_property_count: Total properties count under enumeration type136 */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 data205 *206 * Clears all data allocated for this group of attributes207 */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}222