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// SPDX-License-Identifier: GPL-2.0
/*
* Functions corresponding to integer type attributes under BIOS Integer GUID for use with
* dell-wmi-sysman
*
* Copyright (c) 2020 Dell Inc.
*/
#include "dell-wmi-sysman.h"
enum int_properties {MIN_VALUE = 6, MAX_VALUE, SCALAR_INCR};
get_instance_id(integer);
static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
int instance_id = get_integer_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_INTEGER_ATTRIBUTE_GUID);
if (!obj)
return -EIO;
if (obj->package.elements[CURRENT_VAL].type != ACPI_TYPE_INTEGER) {
kfree(obj);
return -EINVAL;
}
ret = snprintf(buf, PAGE_SIZE, "%lld\n", obj->package.elements[CURRENT_VAL].integer.value);
kfree(obj);
return ret;
}
/**
* validate_integer_input() - Validate input of current_value against lower and upper bound
* @instance_id: The instance on which input is validated
* @buf: Input value
*/
static int validate_integer_input(int instance_id, char *buf)
{
int in_val;
int ret;
ret = kstrtoint(buf, 0, &in_val);
if (ret)
return ret;
if (in_val < wmi_priv.integer_data[instance_id].min_value ||
in_val > wmi_priv.integer_data[instance_id].max_value)
return -EINVAL;
/* workaround for BIOS error.
* validate input to avoid setting 0 when integer input passed with + sign
*/
if (*buf == '+')
memmove(buf, (buf + 1), strlen(buf + 1) + 1);
return ret;
}
attribute_s_property_show(display_name_language_code, integer);
static struct kobj_attribute integer_displ_langcode =
__ATTR_RO(display_name_language_code);
attribute_s_property_show(display_name, integer);
static struct kobj_attribute integer_displ_name =
__ATTR_RO(display_name);
attribute_n_property_show(default_value, integer);
static struct kobj_attribute integer_default_val =
__ATTR_RO(default_value);
attribute_property_store(current_value, integer);
static struct kobj_attribute integer_current_val =
__ATTR_RW_MODE(current_value, 0600);
attribute_s_property_show(dell_modifier, integer);
static struct kobj_attribute integer_modifier =
__ATTR_RO(dell_modifier);
attribute_n_property_show(min_value, integer);
static struct kobj_attribute integer_lower_bound =
__ATTR_RO(min_value);
attribute_n_property_show(max_value, integer);
static struct kobj_attribute integer_upper_bound =
__ATTR_RO(max_value);
attribute_n_property_show(scalar_increment, integer);
static struct kobj_attribute integer_scalar_increment =
__ATTR_RO(scalar_increment);
static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "integer\n");
}
static struct kobj_attribute integer_type =
__ATTR_RO(type);
static struct attribute *integer_attrs[] = {
&integer_displ_langcode.attr,
&integer_displ_name.attr,
&integer_default_val.attr,
&integer_current_val.attr,
&integer_modifier.attr,
&integer_lower_bound.attr,
&integer_upper_bound.attr,
&integer_scalar_increment.attr,
&integer_type.attr,
NULL,
};
static const struct attribute_group integer_attr_group = {
.attrs = integer_attrs,
};
int alloc_int_data(void)
{
int ret = 0;
wmi_priv.integer_instances_count = get_instance_count(DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID);
wmi_priv.integer_data = kcalloc(wmi_priv.integer_instances_count,
sizeof(struct integer_data), GFP_KERNEL);
if (!wmi_priv.integer_data) {
wmi_priv.integer_instances_count = 0;
ret = -ENOMEM;
}
return ret;
}
/**
* populate_int_data() - Populate all properties of an instance under integer attribute
* @integer_obj: ACPI object with integer data
* @instance_id: The instance to enumerate
* @attr_name_kobj: The parent kernel object
*/
int populate_int_data(union acpi_object *integer_obj, int instance_id,
struct kobject *attr_name_kobj)
{
wmi_priv.integer_data[instance_id].attr_name_kobj = attr_name_kobj;
if (check_property_type(integer, ATTR_NAME, ACPI_TYPE_STRING))
return -EINVAL;
strlcpy_attr(wmi_priv.integer_data[instance_id].attribute_name,
integer_obj[ATTR_NAME].string.pointer);
if (check_property_type(integer, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING))
return -EINVAL;
strlcpy_attr(wmi_priv.integer_data[instance_id].display_name_language_code,
integer_obj[DISPL_NAME_LANG_CODE].string.pointer);
if (check_property_type(integer, DISPLAY_NAME, ACPI_TYPE_STRING))
return -EINVAL;
strlcpy_attr(wmi_priv.integer_data[instance_id].display_name,
integer_obj[DISPLAY_NAME].string.pointer);
if (check_property_type(integer, DEFAULT_VAL, ACPI_TYPE_INTEGER))
return -EINVAL;
wmi_priv.integer_data[instance_id].default_value =
(uintptr_t)integer_obj[DEFAULT_VAL].string.pointer;
if (check_property_type(integer, MODIFIER, ACPI_TYPE_STRING))
return -EINVAL;
strlcpy_attr(wmi_priv.integer_data[instance_id].dell_modifier,
integer_obj[MODIFIER].string.pointer);
if (check_property_type(integer, MIN_VALUE, ACPI_TYPE_INTEGER))
return -EINVAL;
wmi_priv.integer_data[instance_id].min_value =
(uintptr_t)integer_obj[MIN_VALUE].string.pointer;
if (check_property_type(integer, MAX_VALUE, ACPI_TYPE_INTEGER))
return -EINVAL;
wmi_priv.integer_data[instance_id].max_value =
(uintptr_t)integer_obj[MAX_VALUE].string.pointer;
if (check_property_type(integer, SCALAR_INCR, ACPI_TYPE_INTEGER))
return -EINVAL;
wmi_priv.integer_data[instance_id].scalar_increment =
(uintptr_t)integer_obj[SCALAR_INCR].string.pointer;
return sysfs_create_group(attr_name_kobj, &integer_attr_group);
}
/**
* exit_int_attributes() - Clear all attribute data
*
* Clears all data allocated for this group of attributes
*/
void exit_int_attributes(void)
{
int instance_id;
for (instance_id = 0; instance_id < wmi_priv.integer_instances_count; instance_id++) {
if (wmi_priv.integer_data[instance_id].attr_name_kobj)
sysfs_remove_group(wmi_priv.integer_data[instance_id].attr_name_kobj,
&integer_attr_group);
}
wmi_priv.integer_instances_count = 0;
kfree(wmi_priv.integer_data);
wmi_priv.integer_data = NULL;
}
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