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// SPDX-License-Identifier: GPL-2.0
/*
* Functions corresponding to enumeration type attributes under
* BIOS Enumeration GUID for use with dell-wmi-sysman
*
* Copyright (c) 2020 Dell Inc.
*/
#include "dell-wmi-sysman.h"
get_instance_id(enumeration);
static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
int instance_id = get_enumeration_instance_id(kobj);
union acpi_object *obj;
ssize_t ret;
if (instance_id < 0)
return instance_id;
/* need to use specific instance_id and guid combination to get right data */
obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID);
if (!obj)
return -EIO;
if (obj->package.elements[CURRENT_VAL].type != ACPI_TYPE_STRING) {
kfree(obj);
return -EINVAL;
}
ret = snprintf(buf, PAGE_SIZE, "%s\n", obj->package.elements[CURRENT_VAL].string.pointer);
kfree(obj);
return ret;
}
/**
* validate_enumeration_input() - Validate input of current_value against possible values
* @instance_id: The instance on which input is validated
* @buf: Input value
*/
static int validate_enumeration_input(int instance_id, const char *buf)
{
char *options, *tmp, *p;
int ret = -EINVAL;
options = tmp = kstrdup(wmi_priv.enumeration_data[instance_id].possible_values,
GFP_KERNEL);
if (!options)
return -ENOMEM;
while ((p = strsep(&options, ";")) != NULL) {
if (!*p)
continue;
if (!strcasecmp(p, buf)) {
ret = 0;
break;
}
}
kfree(tmp);
return ret;
}
attribute_s_property_show(display_name_language_code, enumeration);
static struct kobj_attribute displ_langcode =
__ATTR_RO(display_name_language_code);
attribute_s_property_show(display_name, enumeration);
static struct kobj_attribute displ_name =
__ATTR_RO(display_name);
attribute_s_property_show(default_value, enumeration);
static struct kobj_attribute default_val =
__ATTR_RO(default_value);
attribute_property_store(current_value, enumeration);
static struct kobj_attribute current_val =
__ATTR_RW_MODE(current_value, 0600);
attribute_s_property_show(dell_modifier, enumeration);
static struct kobj_attribute modifier =
__ATTR_RO(dell_modifier);
attribute_s_property_show(dell_value_modifier, enumeration);
static struct kobj_attribute value_modfr =
__ATTR_RO(dell_value_modifier);
attribute_s_property_show(possible_values, enumeration);
static struct kobj_attribute poss_val =
__ATTR_RO(possible_values);
static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "enumeration\n");
}
static struct kobj_attribute type =
__ATTR_RO(type);
static struct attribute *enumeration_attrs[] = {
&displ_langcode.attr,
&displ_name.attr,
&default_val.attr,
¤t_val.attr,
&modifier.attr,
&value_modfr.attr,
&poss_val.attr,
&type.attr,
NULL,
};
static const struct attribute_group enumeration_attr_group = {
.attrs = enumeration_attrs,
};
int alloc_enum_data(void)
{
int ret = 0;
wmi_priv.enumeration_instances_count =
get_instance_count(DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID);
wmi_priv.enumeration_data = kcalloc(wmi_priv.enumeration_instances_count,
sizeof(struct enumeration_data), GFP_KERNEL);
if (!wmi_priv.enumeration_data) {
wmi_priv.enumeration_instances_count = 0;
ret = -ENOMEM;
}
return ret;
}
/**
* populate_enum_data() - Populate all properties of an instance under enumeration attribute
* @enumeration_obj: ACPI object with enumeration data
* @instance_id: The instance to enumerate
* @attr_name_kobj: The parent kernel object
*/
int populate_enum_data(union acpi_object *enumeration_obj, int instance_id,
struct kobject *attr_name_kobj)
{
int i, next_obj, value_modifier_count, possible_values_count;
wmi_priv.enumeration_data[instance_id].attr_name_kobj = attr_name_kobj;
strlcpy_attr(wmi_priv.enumeration_data[instance_id].attribute_name,
enumeration_obj[ATTR_NAME].string.pointer);
strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name_language_code,
enumeration_obj[DISPL_NAME_LANG_CODE].string.pointer);
strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name,
enumeration_obj[DISPLAY_NAME].string.pointer);
strlcpy_attr(wmi_priv.enumeration_data[instance_id].default_value,
enumeration_obj[DEFAULT_VAL].string.pointer);
strlcpy_attr(wmi_priv.enumeration_data[instance_id].dell_modifier,
enumeration_obj[MODIFIER].string.pointer);
next_obj = MODIFIER + 1;
value_modifier_count = (uintptr_t)enumeration_obj[next_obj].string.pointer;
for (i = 0; i < value_modifier_count; i++) {
strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier,
enumeration_obj[++next_obj].string.pointer);
strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier, ";");
}
possible_values_count = (uintptr_t) enumeration_obj[++next_obj].string.pointer;
for (i = 0; i < possible_values_count; i++) {
strcat(wmi_priv.enumeration_data[instance_id].possible_values,
enumeration_obj[++next_obj].string.pointer);
strcat(wmi_priv.enumeration_data[instance_id].possible_values, ";");
}
return sysfs_create_group(attr_name_kobj, &enumeration_attr_group);
}
/**
* exit_enum_attributes() - Clear all attribute data
*
* Clears all data allocated for this group of attributes
*/
void exit_enum_attributes(void)
{
int instance_id;
for (instance_id = 0; instance_id < wmi_priv.enumeration_instances_count; instance_id++) {
if (wmi_priv.enumeration_data[instance_id].attr_name_kobj)
sysfs_remove_group(wmi_priv.enumeration_data[instance_id].attr_name_kobj,
&enumeration_attr_group);
}
kfree(wmi_priv.enumeration_data);
}
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