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192 lines
5.6 KiB
192 lines
5.6 KiB
// 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 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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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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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_ENUMERATION_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_STRING) { |
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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, "%s\n", obj->package.elements[CURRENT_VAL].string.pointer); |
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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_enumeration_input() - Validate input of current_value against possible values |
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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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char *options, *tmp, *p; |
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int ret = -EINVAL; |
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options = tmp = kstrdup(wmi_priv.enumeration_data[instance_id].possible_values, |
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GFP_KERNEL); |
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if (!options) |
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return -ENOMEM; |
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while ((p = strsep(&options, ";")) != NULL) { |
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if (!*p) |
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continue; |
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if (!strcasecmp(p, buf)) { |
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ret = 0; |
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break; |
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} |
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} |
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kfree(tmp); |
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return ret; |
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} |
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attribute_s_property_show(display_name_language_code, enumeration); |
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static struct kobj_attribute displ_langcode = |
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__ATTR_RO(display_name_language_code); |
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attribute_s_property_show(display_name, enumeration); |
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static struct kobj_attribute displ_name = |
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__ATTR_RO(display_name); |
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attribute_s_property_show(default_value, enumeration); |
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static struct kobj_attribute default_val = |
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__ATTR_RO(default_value); |
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attribute_property_store(current_value, enumeration); |
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static struct kobj_attribute current_val = |
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__ATTR_RW_MODE(current_value, 0600); |
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attribute_s_property_show(dell_modifier, enumeration); |
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static struct kobj_attribute modifier = |
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__ATTR_RO(dell_modifier); |
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attribute_s_property_show(dell_value_modifier, enumeration); |
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static struct kobj_attribute value_modfr = |
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__ATTR_RO(dell_value_modifier); |
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attribute_s_property_show(possible_values, enumeration); |
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static struct kobj_attribute 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 sprintf(buf, "enumeration\n"); |
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} |
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static struct kobj_attribute type = |
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__ATTR_RO(type); |
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static struct attribute *enumeration_attrs[] = { |
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&displ_langcode.attr, |
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&displ_name.attr, |
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&default_val.attr, |
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¤t_val.attr, |
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&modifier.attr, |
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&value_modfr.attr, |
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&poss_val.attr, |
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&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 alloc_enum_data(void) |
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{ |
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int ret = 0; |
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wmi_priv.enumeration_instances_count = |
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get_instance_count(DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID); |
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wmi_priv.enumeration_data = kcalloc(wmi_priv.enumeration_instances_count, |
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sizeof(struct enumeration_data), GFP_KERNEL); |
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if (!wmi_priv.enumeration_data) { |
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wmi_priv.enumeration_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_enum_data() - Populate all properties of an instance under enumeration attribute |
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* @enumeration_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 populate_enum_data(union acpi_object *enumeration_obj, int instance_id, |
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struct kobject *attr_name_kobj) |
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{ |
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int i, next_obj, value_modifier_count, possible_values_count; |
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wmi_priv.enumeration_data[instance_id].attr_name_kobj = attr_name_kobj; |
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strlcpy_attr(wmi_priv.enumeration_data[instance_id].attribute_name, |
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enumeration_obj[ATTR_NAME].string.pointer); |
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strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name_language_code, |
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enumeration_obj[DISPL_NAME_LANG_CODE].string.pointer); |
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strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name, |
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enumeration_obj[DISPLAY_NAME].string.pointer); |
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strlcpy_attr(wmi_priv.enumeration_data[instance_id].default_value, |
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enumeration_obj[DEFAULT_VAL].string.pointer); |
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strlcpy_attr(wmi_priv.enumeration_data[instance_id].dell_modifier, |
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enumeration_obj[MODIFIER].string.pointer); |
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next_obj = MODIFIER + 1; |
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value_modifier_count = (uintptr_t)enumeration_obj[next_obj].string.pointer; |
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for (i = 0; i < value_modifier_count; i++) { |
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strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier, |
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enumeration_obj[++next_obj].string.pointer); |
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strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier, ";"); |
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} |
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possible_values_count = (uintptr_t) enumeration_obj[++next_obj].string.pointer; |
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for (i = 0; i < possible_values_count; i++) { |
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strcat(wmi_priv.enumeration_data[instance_id].possible_values, |
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enumeration_obj[++next_obj].string.pointer); |
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strcat(wmi_priv.enumeration_data[instance_id].possible_values, ";"); |
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} |
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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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* exit_enum_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_enum_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.enumeration_instances_count; instance_id++) { |
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if (wmi_priv.enumeration_data[instance_id].attr_name_kobj) |
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sysfs_remove_group(wmi_priv.enumeration_data[instance_id].attr_name_kobj, |
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&enumeration_attr_group); |
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} |
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wmi_priv.enumeration_instances_count = 0; |
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kfree(wmi_priv.enumeration_data); |
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wmi_priv.enumeration_data = NULL; |
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}
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