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