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 11 enum int_properties {MIN_VALUE = 6, MAX_VALUE, SCALAR_INCR}; 12 13 get_instance_id(integer); 14 15 static 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->type != ACPI_TYPE_PACKAGE || obj->package.count < INT_MIN_ELEMENTS || 29 obj->package.elements[CURRENT_VAL].type != ACPI_TYPE_INTEGER) { 30 kfree(obj); 31 return -EIO; 32 } 33 ret = snprintf(buf, PAGE_SIZE, "%lld\n", obj->package.elements[CURRENT_VAL].integer.value); 34 kfree(obj); 35 return ret; 36 } 37 38 /** 39 * validate_integer_input() - Validate input of current_value against lower and upper bound 40 * @instance_id: The instance on which input is validated 41 * @buf: Input value 42 */ 43 static int validate_integer_input(int instance_id, char *buf) 44 { 45 int in_val; 46 int ret; 47 48 ret = kstrtoint(buf, 0, &in_val); 49 if (ret) 50 return ret; 51 if (in_val < wmi_priv.integer_data[instance_id].min_value || 52 in_val > wmi_priv.integer_data[instance_id].max_value) 53 return -EINVAL; 54 55 /* workaround for BIOS error. 56 * validate input to avoid setting 0 when integer input passed with + sign 57 */ 58 if (*buf == '+') 59 memmove(buf, (buf + 1), strlen(buf + 1) + 1); 60 61 return ret; 62 } 63 64 attribute_s_property_show(display_name_language_code, integer); 65 static struct kobj_attribute integer_displ_langcode = 66 __ATTR_RO(display_name_language_code); 67 68 attribute_s_property_show(display_name, integer); 69 static struct kobj_attribute integer_displ_name = 70 __ATTR_RO(display_name); 71 72 attribute_n_property_show(default_value, integer); 73 static struct kobj_attribute integer_default_val = 74 __ATTR_RO(default_value); 75 76 attribute_property_store(current_value, integer); 77 static struct kobj_attribute integer_current_val = 78 __ATTR_RW_MODE(current_value, 0600); 79 80 attribute_s_property_show(dell_modifier, integer); 81 static struct kobj_attribute integer_modifier = 82 __ATTR_RO(dell_modifier); 83 84 attribute_n_property_show(min_value, integer); 85 static struct kobj_attribute integer_lower_bound = 86 __ATTR_RO(min_value); 87 88 attribute_n_property_show(max_value, integer); 89 static struct kobj_attribute integer_upper_bound = 90 __ATTR_RO(max_value); 91 92 attribute_n_property_show(scalar_increment, integer); 93 static struct kobj_attribute integer_scalar_increment = 94 __ATTR_RO(scalar_increment); 95 96 static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr, 97 char *buf) 98 { 99 return sprintf(buf, "integer\n"); 100 } 101 static struct kobj_attribute integer_type = 102 __ATTR_RO(type); 103 104 static struct attribute *integer_attrs[] = { 105 &integer_displ_langcode.attr, 106 &integer_displ_name.attr, 107 &integer_default_val.attr, 108 &integer_current_val.attr, 109 &integer_modifier.attr, 110 &integer_lower_bound.attr, 111 &integer_upper_bound.attr, 112 &integer_scalar_increment.attr, 113 &integer_type.attr, 114 NULL, 115 }; 116 117 static const struct attribute_group integer_attr_group = { 118 .attrs = integer_attrs, 119 }; 120 121 int alloc_int_data(void) 122 { 123 int ret = 0; 124 125 wmi_priv.integer_instances_count = get_instance_count(DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID); 126 wmi_priv.integer_data = kcalloc(wmi_priv.integer_instances_count, 127 sizeof(struct integer_data), GFP_KERNEL); 128 if (!wmi_priv.integer_data) { 129 wmi_priv.integer_instances_count = 0; 130 ret = -ENOMEM; 131 } 132 return ret; 133 } 134 135 /** 136 * populate_int_data() - Populate all properties of an instance under integer attribute 137 * @integer_obj: ACPI object with integer data 138 * @instance_id: The instance to enumerate 139 * @attr_name_kobj: The parent kernel object 140 */ 141 int populate_int_data(union acpi_object *integer_obj, int instance_id, 142 struct kobject *attr_name_kobj) 143 { 144 wmi_priv.integer_data[instance_id].attr_name_kobj = attr_name_kobj; 145 if (check_property_type(integer, ATTR_NAME, ACPI_TYPE_STRING)) 146 return -EINVAL; 147 strlcpy_attr(wmi_priv.integer_data[instance_id].attribute_name, 148 integer_obj[ATTR_NAME].string.pointer); 149 if (check_property_type(integer, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING)) 150 return -EINVAL; 151 strlcpy_attr(wmi_priv.integer_data[instance_id].display_name_language_code, 152 integer_obj[DISPL_NAME_LANG_CODE].string.pointer); 153 if (check_property_type(integer, DISPLAY_NAME, ACPI_TYPE_STRING)) 154 return -EINVAL; 155 strlcpy_attr(wmi_priv.integer_data[instance_id].display_name, 156 integer_obj[DISPLAY_NAME].string.pointer); 157 if (check_property_type(integer, DEFAULT_VAL, ACPI_TYPE_INTEGER)) 158 return -EINVAL; 159 wmi_priv.integer_data[instance_id].default_value = 160 (uintptr_t)integer_obj[DEFAULT_VAL].string.pointer; 161 if (check_property_type(integer, MODIFIER, ACPI_TYPE_STRING)) 162 return -EINVAL; 163 strlcpy_attr(wmi_priv.integer_data[instance_id].dell_modifier, 164 integer_obj[MODIFIER].string.pointer); 165 if (check_property_type(integer, MIN_VALUE, ACPI_TYPE_INTEGER)) 166 return -EINVAL; 167 wmi_priv.integer_data[instance_id].min_value = 168 (uintptr_t)integer_obj[MIN_VALUE].string.pointer; 169 if (check_property_type(integer, MAX_VALUE, ACPI_TYPE_INTEGER)) 170 return -EINVAL; 171 wmi_priv.integer_data[instance_id].max_value = 172 (uintptr_t)integer_obj[MAX_VALUE].string.pointer; 173 if (check_property_type(integer, SCALAR_INCR, ACPI_TYPE_INTEGER)) 174 return -EINVAL; 175 wmi_priv.integer_data[instance_id].scalar_increment = 176 (uintptr_t)integer_obj[SCALAR_INCR].string.pointer; 177 178 return sysfs_create_group(attr_name_kobj, &integer_attr_group); 179 } 180 181 /** 182 * exit_int_attributes() - Clear all attribute data 183 * 184 * Clears all data allocated for this group of attributes 185 */ 186 void exit_int_attributes(void) 187 { 188 int instance_id; 189 190 for (instance_id = 0; instance_id < wmi_priv.integer_instances_count; instance_id++) { 191 if (wmi_priv.integer_data[instance_id].attr_name_kobj) 192 sysfs_remove_group(wmi_priv.integer_data[instance_id].attr_name_kobj, 193 &integer_attr_group); 194 } 195 wmi_priv.integer_instances_count = 0; 196 197 kfree(wmi_priv.integer_data); 198 wmi_priv.integer_data = NULL; 199 } 200