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1// SPDX-License-Identifier: GPL-2.02/*3 * Functions corresponding to integer type attributes under BIOS Integer GUID for use with4 * dell-wmi-sysman5 *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 bound39 * @instance_id: The instance on which input is validated40 * @buf: Input value41 */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 + sign56 */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 attribute136 * @integer_obj: ACPI object with integer data137 * @instance_id: The instance to enumerate138 * @attr_name_kobj: The parent kernel object139 */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 data182 *183 * Clears all data allocated for this group of attributes184 */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