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1// SPDX-License-Identifier: GPL-2.02/*3 * Functions corresponding to string type attributes under BIOS String GUID for use with4 * dell-wmi-sysman5 *6 * Copyright (c) 2020 Dell Inc.7 */8 9#include "dell-wmi-sysman.h"10 11enum string_properties {MIN_LEN = 6, MAX_LEN};12 13get_instance_id(str);14 15static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)16{17 int instance_id = get_str_instance_id(kobj);18 union acpi_object *obj;19 ssize_t ret;20 21 if (instance_id < 0)22 return -EIO;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_STRING_ATTRIBUTE_GUID);26 if (!obj)27 return -EIO;28 if (obj->package.elements[CURRENT_VAL].type != ACPI_TYPE_STRING) {29 kfree(obj);30 return -EINVAL;31 }32 ret = snprintf(buf, PAGE_SIZE, "%s\n", obj->package.elements[CURRENT_VAL].string.pointer);33 kfree(obj);34 return ret;35}36 37/**38 * validate_str_input() - Validate input of current_value against min and max lengths39 * @instance_id: The instance on which input is validated40 * @buf: Input value41 */42static int validate_str_input(int instance_id, const char *buf)43{44 int in_len = strlen(buf);45 46 if ((in_len < wmi_priv.str_data[instance_id].min_length) ||47 (in_len > wmi_priv.str_data[instance_id].max_length))48 return -EINVAL;49 50 return 0;51}52 53attribute_s_property_show(display_name_language_code, str);54static struct kobj_attribute str_displ_langcode =55 __ATTR_RO(display_name_language_code);56 57attribute_s_property_show(display_name, str);58static struct kobj_attribute str_displ_name =59 __ATTR_RO(display_name);60 61attribute_s_property_show(default_value, str);62static struct kobj_attribute str_default_val =63 __ATTR_RO(default_value);64 65attribute_property_store(current_value, str);66static struct kobj_attribute str_current_val =67 __ATTR_RW_MODE(current_value, 0600);68 69attribute_s_property_show(dell_modifier, str);70static struct kobj_attribute str_modifier =71 __ATTR_RO(dell_modifier);72 73attribute_n_property_show(min_length, str);74static struct kobj_attribute str_min_length =75 __ATTR_RO(min_length);76 77attribute_n_property_show(max_length, str);78static struct kobj_attribute str_max_length =79 __ATTR_RO(max_length);80 81static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,82 char *buf)83{84 return sprintf(buf, "string\n");85}86static struct kobj_attribute str_type =87 __ATTR_RO(type);88 89static struct attribute *str_attrs[] = {90 &str_displ_langcode.attr,91 &str_displ_name.attr,92 &str_default_val.attr,93 &str_current_val.attr,94 &str_modifier.attr,95 &str_min_length.attr,96 &str_max_length.attr,97 &str_type.attr,98 NULL,99};100 101static const struct attribute_group str_attr_group = {102 .attrs = str_attrs,103};104 105int alloc_str_data(void)106{107 int ret = 0;108 109 wmi_priv.str_instances_count = get_instance_count(DELL_WMI_BIOS_STRING_ATTRIBUTE_GUID);110 wmi_priv.str_data = kcalloc(wmi_priv.str_instances_count,111 sizeof(struct str_data), GFP_KERNEL);112 if (!wmi_priv.str_data) {113 wmi_priv.str_instances_count = 0;114 ret = -ENOMEM;115 }116 return ret;117}118 119/**120 * populate_str_data() - Populate all properties of an instance under string attribute121 * @str_obj: ACPI object with string data122 * @instance_id: The instance to enumerate123 * @attr_name_kobj: The parent kernel object124 */125int populate_str_data(union acpi_object *str_obj, int instance_id, struct kobject *attr_name_kobj)126{127 wmi_priv.str_data[instance_id].attr_name_kobj = attr_name_kobj;128 if (check_property_type(str, ATTR_NAME, ACPI_TYPE_STRING))129 return -EINVAL;130 strlcpy_attr(wmi_priv.str_data[instance_id].attribute_name,131 str_obj[ATTR_NAME].string.pointer);132 if (check_property_type(str, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING))133 return -EINVAL;134 strlcpy_attr(wmi_priv.str_data[instance_id].display_name_language_code,135 str_obj[DISPL_NAME_LANG_CODE].string.pointer);136 if (check_property_type(str, DISPLAY_NAME, ACPI_TYPE_STRING))137 return -EINVAL;138 strlcpy_attr(wmi_priv.str_data[instance_id].display_name,139 str_obj[DISPLAY_NAME].string.pointer);140 if (check_property_type(str, DEFAULT_VAL, ACPI_TYPE_STRING))141 return -EINVAL;142 strlcpy_attr(wmi_priv.str_data[instance_id].default_value,143 str_obj[DEFAULT_VAL].string.pointer);144 if (check_property_type(str, MODIFIER, ACPI_TYPE_STRING))145 return -EINVAL;146 strlcpy_attr(wmi_priv.str_data[instance_id].dell_modifier,147 str_obj[MODIFIER].string.pointer);148 if (check_property_type(str, MIN_LEN, ACPI_TYPE_INTEGER))149 return -EINVAL;150 wmi_priv.str_data[instance_id].min_length = (uintptr_t)str_obj[MIN_LEN].string.pointer;151 if (check_property_type(str, MAX_LEN, ACPI_TYPE_INTEGER))152 return -EINVAL;153 wmi_priv.str_data[instance_id].max_length = (uintptr_t) str_obj[MAX_LEN].string.pointer;154 155 return sysfs_create_group(attr_name_kobj, &str_attr_group);156}157 158/**159 * exit_str_attributes() - Clear all attribute data160 *161 * Clears all data allocated for this group of attributes162 */163void exit_str_attributes(void)164{165 int instance_id;166 167 for (instance_id = 0; instance_id < wmi_priv.str_instances_count; instance_id++) {168 if (wmi_priv.str_data[instance_id].attr_name_kobj)169 sysfs_remove_group(wmi_priv.str_data[instance_id].attr_name_kobj,170 &str_attr_group);171 }172 wmi_priv.str_instances_count = 0;173 174 kfree(wmi_priv.str_data);175 wmi_priv.str_data = NULL;176}177