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->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 bound 39 * @instance_id: The instance on which input is validated 40 * @buf: Input value 41 */ 42 static 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 + sign 56 */ 57 if (*buf == '+') 58 memmove(buf, (buf + 1), strlen(buf + 1) + 1); 59 60 return ret; 61 } 62 63 attribute_s_property_show(display_name_language_code, integer); 64 static struct kobj_attribute integer_displ_langcode = 65 __ATTR_RO(display_name_language_code); 66 67 attribute_s_property_show(display_name, integer); 68 static struct kobj_attribute integer_displ_name = 69 __ATTR_RO(display_name); 70 71 attribute_n_property_show(default_value, integer); 72 static struct kobj_attribute integer_default_val = 73 __ATTR_RO(default_value); 74 75 attribute_property_store(current_value, integer); 76 static struct kobj_attribute integer_current_val = 77 __ATTR_RW_MODE(current_value, 0600); 78 79 attribute_s_property_show(dell_modifier, integer); 80 static struct kobj_attribute integer_modifier = 81 __ATTR_RO(dell_modifier); 82 83 attribute_n_property_show(min_value, integer); 84 static struct kobj_attribute integer_lower_bound = 85 __ATTR_RO(min_value); 86 87 attribute_n_property_show(max_value, integer); 88 static struct kobj_attribute integer_upper_bound = 89 __ATTR_RO(max_value); 90 91 attribute_n_property_show(scalar_increment, integer); 92 static struct kobj_attribute integer_scalar_increment = 93 __ATTR_RO(scalar_increment); 94 95 static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr, 96 char *buf) 97 { 98 return sprintf(buf, "integer\n"); 99 } 100 static struct kobj_attribute integer_type = 101 __ATTR_RO(type); 102 103 static 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 }; 115 116 static const struct attribute_group integer_attr_group = { 117 .attrs = integer_attrs, 118 }; 119 120 int 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 attribute 136 * @integer_obj: ACPI object with integer data 137 * @instance_id: The instance to enumerate 138 * @attr_name_kobj: The parent kernel object 139 */ 140 int 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 strlcpy_attr(wmi_priv.integer_data[instance_id].attribute_name, 145 integer_obj[ATTR_NAME].string.pointer); 146 strlcpy_attr(wmi_priv.integer_data[instance_id].display_name_language_code, 147 integer_obj[DISPL_NAME_LANG_CODE].string.pointer); 148 strlcpy_attr(wmi_priv.integer_data[instance_id].display_name, 149 integer_obj[DISPLAY_NAME].string.pointer); 150 wmi_priv.integer_data[instance_id].default_value = 151 (uintptr_t)integer_obj[DEFAULT_VAL].string.pointer; 152 strlcpy_attr(wmi_priv.integer_data[instance_id].dell_modifier, 153 integer_obj[MODIFIER].string.pointer); 154 wmi_priv.integer_data[instance_id].min_value = 155 (uintptr_t)integer_obj[MIN_VALUE].string.pointer; 156 wmi_priv.integer_data[instance_id].max_value = 157 (uintptr_t)integer_obj[MAX_VALUE].string.pointer; 158 wmi_priv.integer_data[instance_id].scalar_increment = 159 (uintptr_t)integer_obj[SCALAR_INCR].string.pointer; 160 161 return sysfs_create_group(attr_name_kobj, &integer_attr_group); 162 } 163 164 /** 165 * exit_int_attributes() - Clear all attribute data 166 * 167 * Clears all data allocated for this group of attributes 168 */ 169 void exit_int_attributes(void) 170 { 171 int instance_id; 172 173 for (instance_id = 0; instance_id < wmi_priv.integer_instances_count; instance_id++) { 174 if (wmi_priv.integer_data[instance_id].attr_name_kobj) 175 sysfs_remove_group(wmi_priv.integer_data[instance_id].attr_name_kobj, 176 &integer_attr_group); 177 } 178 wmi_priv.integer_instances_count = 0; 179 180 kfree(wmi_priv.integer_data); 181 wmi_priv.integer_data = NULL; 182 } 183