platform/x86: hp-bioscfg: enum-attributes
Add enumeration attributes support to hp-bioscfg. HP BIOS Configuration driver purpose is to provide a driver supporting the latest sysfs class firmware attributes framework allowing the user to change BIOS settings and security solutions on HP Inc.’s commercial notebooks. Signed-off-by: Jorge Lopez <jorge.lopez2@hp.com> Reviewed-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://lore.kernel.org/r/20230608163319.18934-6-jorge.lopez2@hp.com Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Jorge Lopez
Hans de Goede
parent
69ea03e38f
commit
6b2770bfd6
447
drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c
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447
drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c
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@ -0,0 +1,447 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Functions corresponding to enumeration type attributes under
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* BIOS Enumeration GUID for use with hp-bioscfg driver.
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*
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* Copyright (c) 2022 HP Development Company, L.P.
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*/
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#include "bioscfg.h"
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GET_INSTANCE_ID(enumeration);
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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_enumeration_instance_id(kobj);
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if (instance_id < 0)
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return -EIO;
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return sysfs_emit(buf, "%s\n",
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bioscfg_drv.enumeration_data[instance_id].current_value);
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}
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/**
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* validate_enumeration_input() -
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* Validate input of current_value against possible values
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*
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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_enumeration_input(int instance_id, const char *buf)
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{
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int i;
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int found = 0;
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struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id];
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/* Is it a read only attribute */
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if (enum_data->common.is_readonly)
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return -EIO;
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for (i = 0; i < enum_data->possible_values_size && !found; i++)
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if (!strcmp(enum_data->possible_values[i], buf))
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found = 1;
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if (!found)
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return -EINVAL;
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return 0;
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}
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static void update_enumeration_value(int instance_id, char *attr_value)
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{
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struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id];
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strscpy(enum_data->current_value,
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attr_value,
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sizeof(enum_data->current_value));
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}
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ATTRIBUTE_S_COMMON_PROPERTY_SHOW(display_name, enumeration);
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static struct kobj_attribute enumeration_display_name =
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__ATTR_RO(display_name);
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ATTRIBUTE_PROPERTY_STORE(current_value, enumeration);
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static struct kobj_attribute enumeration_current_val =
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__ATTR_RW(current_value);
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ATTRIBUTE_VALUES_PROPERTY_SHOW(possible_values, enumeration, SEMICOLON_SEP);
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static struct kobj_attribute enumeration_poss_val =
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__ATTR_RO(possible_values);
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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 sysfs_emit(buf, "enumeration\n");
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}
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static struct kobj_attribute enumeration_type =
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__ATTR_RO(type);
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static struct attribute *enumeration_attrs[] = {
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&common_display_langcode.attr,
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&enumeration_display_name.attr,
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&enumeration_current_val.attr,
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&enumeration_poss_val.attr,
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&enumeration_type.attr,
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NULL
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};
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static const struct attribute_group enumeration_attr_group = {
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.attrs = enumeration_attrs,
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};
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int hp_alloc_enumeration_data(void)
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{
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bioscfg_drv.enumeration_instances_count =
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hp_get_instance_count(HP_WMI_BIOS_ENUMERATION_GUID);
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bioscfg_drv.enumeration_data = kcalloc(bioscfg_drv.enumeration_instances_count,
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sizeof(*bioscfg_drv.enumeration_data), GFP_KERNEL);
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if (!bioscfg_drv.enumeration_data) {
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bioscfg_drv.enumeration_instances_count = 0;
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return -ENOMEM;
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}
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return 0;
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}
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/* Expected Values types associated with each element */
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static const acpi_object_type expected_enum_types[] = {
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[NAME] = ACPI_TYPE_STRING,
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[VALUE] = ACPI_TYPE_STRING,
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[PATH] = ACPI_TYPE_STRING,
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[IS_READONLY] = ACPI_TYPE_INTEGER,
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[DISPLAY_IN_UI] = ACPI_TYPE_INTEGER,
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[REQUIRES_PHYSICAL_PRESENCE] = ACPI_TYPE_INTEGER,
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[SEQUENCE] = ACPI_TYPE_INTEGER,
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[PREREQUISITES_SIZE] = ACPI_TYPE_INTEGER,
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[PREREQUISITES] = ACPI_TYPE_STRING,
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[SECURITY_LEVEL] = ACPI_TYPE_INTEGER,
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[ENUM_CURRENT_VALUE] = ACPI_TYPE_STRING,
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[ENUM_SIZE] = ACPI_TYPE_INTEGER,
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[ENUM_POSSIBLE_VALUES] = ACPI_TYPE_STRING,
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};
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static int hp_populate_enumeration_elements_from_package(union acpi_object *enum_obj,
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int enum_obj_count,
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int instance_id)
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{
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char *str_value = NULL;
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int value_len;
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u32 size = 0;
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u32 int_value;
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int elem = 0;
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int reqs;
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int pos_values;
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int ret;
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int eloc;
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struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id];
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for (elem = 1, eloc = 1; elem < enum_obj_count; elem++, eloc++) {
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/* ONLY look at the first ENUM_ELEM_CNT elements */
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if (eloc == ENUM_ELEM_CNT)
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goto exit_enumeration_package;
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switch (enum_obj[elem].type) {
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case ACPI_TYPE_STRING:
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if (PREREQUISITES != elem && ENUM_POSSIBLE_VALUES != elem) {
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ret = hp_convert_hexstr_to_str(enum_obj[elem].string.pointer,
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enum_obj[elem].string.length,
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&str_value, &value_len);
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if (ret)
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return -EINVAL;
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}
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break;
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case ACPI_TYPE_INTEGER:
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int_value = (u32)enum_obj[elem].integer.value;
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break;
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default:
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pr_warn("Unsupported object type [%d]\n", enum_obj[elem].type);
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continue;
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}
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/* Check that both expected and read object type match */
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if (expected_enum_types[eloc] != enum_obj[elem].type) {
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pr_err("Error expected type %d for elem %d, but got type %d instead\n",
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expected_enum_types[eloc], elem, enum_obj[elem].type);
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return -EIO;
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}
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/* Assign appropriate element value to corresponding field */
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switch (eloc) {
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case NAME:
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case VALUE:
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break;
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case PATH:
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strscpy(enum_data->common.path, str_value,
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sizeof(enum_data->common.path));
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break;
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case IS_READONLY:
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enum_data->common.is_readonly = int_value;
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break;
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case DISPLAY_IN_UI:
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enum_data->common.display_in_ui = int_value;
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break;
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case REQUIRES_PHYSICAL_PRESENCE:
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enum_data->common.requires_physical_presence = int_value;
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break;
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case SEQUENCE:
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enum_data->common.sequence = int_value;
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break;
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case PREREQUISITES_SIZE:
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enum_data->common.prerequisites_size = int_value;
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if (int_value > MAX_PREREQUISITES_SIZE)
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pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n");
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/*
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* This HACK is needed to keep the expected
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* element list pointing to the right obj[elem].type
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* when the size is zero. PREREQUISITES
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* object is omitted by BIOS when the size is
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* zero.
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*/
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if (int_value == 0)
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eloc++;
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break;
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case PREREQUISITES:
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size = min_t(u32, enum_data->common.prerequisites_size, MAX_PREREQUISITES_SIZE);
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for (reqs = 0; reqs < size; reqs++) {
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if (elem >= enum_obj_count) {
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pr_err("Error enum-objects package is too small\n");
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return -EINVAL;
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}
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ret = hp_convert_hexstr_to_str(enum_obj[elem + reqs].string.pointer,
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enum_obj[elem + reqs].string.length,
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&str_value, &value_len);
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if (ret)
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return -EINVAL;
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strscpy(enum_data->common.prerequisites[reqs],
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str_value,
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sizeof(enum_data->common.prerequisites[reqs]));
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kfree(str_value);
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}
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break;
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case SECURITY_LEVEL:
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enum_data->common.security_level = int_value;
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break;
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case ENUM_CURRENT_VALUE:
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strscpy(enum_data->current_value,
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str_value, sizeof(enum_data->current_value));
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break;
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case ENUM_SIZE:
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enum_data->possible_values_size = int_value;
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if (int_value > MAX_VALUES_SIZE)
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pr_warn("Possible number values size value exceeded the maximum number of elements supported or data may be malformed\n");
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/*
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* This HACK is needed to keep the expected
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* element list pointing to the right obj[elem].type
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* when the size is zero. POSSIBLE_VALUES
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* object is omitted by BIOS when the size is zero.
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*/
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if (int_value == 0)
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eloc++;
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break;
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case ENUM_POSSIBLE_VALUES:
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size = enum_data->possible_values_size;
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for (pos_values = 0; pos_values < size && pos_values < MAX_VALUES_SIZE;
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pos_values++) {
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if (elem >= enum_obj_count) {
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pr_err("Error enum-objects package is too small\n");
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return -EINVAL;
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}
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ret = hp_convert_hexstr_to_str(enum_obj[elem + pos_values].string.pointer,
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enum_obj[elem + pos_values].string.length,
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&str_value, &value_len);
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if (ret)
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return -EINVAL;
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/*
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* ignore strings when possible values size
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* is greater than MAX_VALUES_SIZE
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*/
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if (size < MAX_VALUES_SIZE)
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strscpy(enum_data->possible_values[pos_values],
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str_value,
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sizeof(enum_data->possible_values[pos_values]));
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}
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break;
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default:
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pr_warn("Invalid element: %d found in Enumeration attribute or data may be malformed\n", elem);
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break;
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}
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kfree(str_value);
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}
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exit_enumeration_package:
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kfree(str_value);
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return 0;
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}
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/**
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* hp_populate_enumeration_package_data() -
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* Populate all properties of an instance under enumeration attribute
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*
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* @enum_obj: ACPI object with enumeration 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 hp_populate_enumeration_package_data(union acpi_object *enum_obj,
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int instance_id,
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struct kobject *attr_name_kobj)
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{
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struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id];
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enum_data->attr_name_kobj = attr_name_kobj;
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hp_populate_enumeration_elements_from_package(enum_obj,
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enum_obj->package.count,
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instance_id);
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hp_update_attribute_permissions(enum_data->common.is_readonly,
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&enumeration_current_val);
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/*
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* Several attributes have names such "MONDAY". Friendly
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* user nane is generated to make the name more descriptive
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*/
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hp_friendly_user_name_update(enum_data->common.path,
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attr_name_kobj->name,
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enum_data->common.display_name,
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sizeof(enum_data->common.display_name));
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return sysfs_create_group(attr_name_kobj, &enumeration_attr_group);
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}
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static int hp_populate_enumeration_elements_from_buffer(u8 *buffer_ptr, u32 *buffer_size,
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int instance_id)
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{
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int values;
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struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id];
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int ret = 0;
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/*
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* Only data relevant to this driver and its functionality is
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* read. BIOS defines the order in which each * element is
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* read. Element 0 data is not relevant to this
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* driver hence it is ignored. For clarity, all element names
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* (DISPLAY_IN_UI) which defines the order in which is read
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* and the name matches the variable where the data is stored.
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*
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* In earlier implementation, reported errors were ignored
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* causing the data to remain uninitialized. It is not
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* possible to determine if data read from BIOS is valid or
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* not. It is for this reason functions may return a error
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* without validating the data itself.
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*/
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// VALUE:
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ret = hp_get_string_from_buffer(&buffer_ptr, buffer_size, enum_data->current_value,
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sizeof(enum_data->current_value));
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if (ret < 0)
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goto buffer_exit;
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// COMMON:
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ret = hp_get_common_data_from_buffer(&buffer_ptr, buffer_size, &enum_data->common);
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if (ret < 0)
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goto buffer_exit;
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// ENUM_CURRENT_VALUE:
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ret = hp_get_string_from_buffer(&buffer_ptr, buffer_size,
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enum_data->current_value,
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sizeof(enum_data->current_value));
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if (ret < 0)
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goto buffer_exit;
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// ENUM_SIZE:
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ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size,
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&enum_data->possible_values_size);
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if (enum_data->possible_values_size > MAX_VALUES_SIZE) {
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/* Report a message and limit possible values size to maximum value */
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pr_warn("Enum Possible size value exceeded the maximum number of elements supported or data may be malformed\n");
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enum_data->possible_values_size = MAX_VALUES_SIZE;
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}
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// ENUM_POSSIBLE_VALUES:
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for (values = 0; values < enum_data->possible_values_size; values++) {
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ret = hp_get_string_from_buffer(&buffer_ptr, buffer_size,
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enum_data->possible_values[values],
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sizeof(enum_data->possible_values[values]));
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if (ret < 0)
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break;
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}
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buffer_exit:
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return ret;
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}
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/**
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* hp_populate_enumeration_buffer_data() -
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* Populate all properties of an instance under enumeration attribute
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*
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* @buffer_ptr: Buffer pointer
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* @buffer_size: Buffer size
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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 hp_populate_enumeration_buffer_data(u8 *buffer_ptr, u32 *buffer_size,
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int instance_id,
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struct kobject *attr_name_kobj)
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{
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struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id];
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int ret = 0;
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enum_data->attr_name_kobj = attr_name_kobj;
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/* Populate enumeration elements */
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ret = hp_populate_enumeration_elements_from_buffer(buffer_ptr, buffer_size,
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instance_id);
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if (ret < 0)
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return ret;
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hp_update_attribute_permissions(enum_data->common.is_readonly,
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&enumeration_current_val);
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/*
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* Several attributes have names such "MONDAY". A Friendlier
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* user nane is generated to make the name more descriptive
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*/
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hp_friendly_user_name_update(enum_data->common.path,
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attr_name_kobj->name,
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enum_data->common.display_name,
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sizeof(enum_data->common.display_name));
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return sysfs_create_group(attr_name_kobj, &enumeration_attr_group);
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}
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/**
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* hp_exit_enumeration_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 hp_exit_enumeration_attributes(void)
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{
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int instance_id;
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for (instance_id = 0; instance_id < bioscfg_drv.enumeration_instances_count;
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instance_id++) {
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struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id];
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struct kobject *attr_name_kobj = enum_data->attr_name_kobj;
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if (attr_name_kobj)
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sysfs_remove_group(attr_name_kobj, &enumeration_attr_group);
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}
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bioscfg_drv.enumeration_instances_count = 0;
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kfree(bioscfg_drv.enumeration_data);
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bioscfg_drv.enumeration_data = NULL;
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}
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