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182 lines
5.4 KiB
182 lines
5.4 KiB
// 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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strlcpy_attr(wmi_priv.integer_data[instance_id].attribute_name, |
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integer_obj[ATTR_NAME].string.pointer); |
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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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strlcpy_attr(wmi_priv.integer_data[instance_id].display_name, |
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integer_obj[DISPLAY_NAME].string.pointer); |
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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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strlcpy_attr(wmi_priv.integer_data[instance_id].dell_modifier, |
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integer_obj[MODIFIER].string.pointer); |
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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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wmi_priv.integer_data[instance_id].max_value = |
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(uintptr_t)integer_obj[MAX_VALUE].string.pointer; |
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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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