Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Jorge Lopez | 1613 | 100.00% | 5 | 100.00% |
Total | 1613 | 5 |
// SPDX-License-Identifier: GPL-2.0 /* * Functions corresponding to integer type attributes under * BIOS Enumeration GUID for use with hp-bioscfg driver. * * Copyright (c) 2022 Hewlett-Packard Inc. */ #include "bioscfg.h" 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); if (instance_id < 0) return -EIO; return sysfs_emit(buf, "%d\n", bioscfg_drv.integer_data[instance_id].current_value); } /** * 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; struct integer_data *integer_data = &bioscfg_drv.integer_data[instance_id]; /* BIOS treats it as a read only attribute */ if (integer_data->common.is_readonly) return -EIO; ret = kstrtoint(buf, 10, &in_val); if (ret < 0) return ret; if (in_val < integer_data->lower_bound || in_val > integer_data->upper_bound) return -ERANGE; return 0; } static void update_integer_value(int instance_id, char *attr_value) { int in_val; int ret; struct integer_data *integer_data = &bioscfg_drv.integer_data[instance_id]; ret = kstrtoint(attr_value, 10, &in_val); if (ret == 0) integer_data->current_value = in_val; else pr_warn("Invalid integer value found: %s\n", attr_value); } ATTRIBUTE_S_COMMON_PROPERTY_SHOW(display_name, integer); static struct kobj_attribute integer_display_name = __ATTR_RO(display_name); ATTRIBUTE_PROPERTY_STORE(current_value, integer); static struct kobj_attribute integer_current_val = __ATTR_RW_MODE(current_value, 0644); ATTRIBUTE_N_PROPERTY_SHOW(lower_bound, integer); static struct kobj_attribute integer_lower_bound = __ATTR_RO(lower_bound); ATTRIBUTE_N_PROPERTY_SHOW(upper_bound, integer); static struct kobj_attribute integer_upper_bound = __ATTR_RO(upper_bound); 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 sysfs_emit(buf, "integer\n"); } static struct kobj_attribute integer_type = __ATTR_RO(type); static struct attribute *integer_attrs[] = { &common_display_langcode.attr, &integer_display_name.attr, &integer_current_val.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 hp_alloc_integer_data(void) { bioscfg_drv.integer_instances_count = hp_get_instance_count(HP_WMI_BIOS_INTEGER_GUID); bioscfg_drv.integer_data = kcalloc(bioscfg_drv.integer_instances_count, sizeof(*bioscfg_drv.integer_data), GFP_KERNEL); if (!bioscfg_drv.integer_data) { bioscfg_drv.integer_instances_count = 0; return -ENOMEM; } return 0; } /* Expected Values types associated with each element */ static const acpi_object_type expected_integer_types[] = { [NAME] = ACPI_TYPE_STRING, [VALUE] = ACPI_TYPE_STRING, [PATH] = ACPI_TYPE_STRING, [IS_READONLY] = ACPI_TYPE_INTEGER, [DISPLAY_IN_UI] = ACPI_TYPE_INTEGER, [REQUIRES_PHYSICAL_PRESENCE] = ACPI_TYPE_INTEGER, [SEQUENCE] = ACPI_TYPE_INTEGER, [PREREQUISITES_SIZE] = ACPI_TYPE_INTEGER, [PREREQUISITES] = ACPI_TYPE_STRING, [SECURITY_LEVEL] = ACPI_TYPE_INTEGER, [INT_LOWER_BOUND] = ACPI_TYPE_INTEGER, [INT_UPPER_BOUND] = ACPI_TYPE_INTEGER, [INT_SCALAR_INCREMENT] = ACPI_TYPE_INTEGER, }; static int hp_populate_integer_elements_from_package(union acpi_object *integer_obj, int integer_obj_count, int instance_id) { char *str_value = NULL; int value_len; int ret; u32 int_value = 0; int elem; int reqs; int eloc; int size; struct integer_data *integer_data = &bioscfg_drv.integer_data[instance_id]; if (!integer_obj) return -EINVAL; for (elem = 1, eloc = 1; elem < integer_obj_count; elem++, eloc++) { /* ONLY look at the first INTEGER_ELEM_CNT elements */ if (eloc == INT_ELEM_CNT) goto exit_integer_package; switch (integer_obj[elem].type) { case ACPI_TYPE_STRING: if (elem != PREREQUISITES) { ret = hp_convert_hexstr_to_str(integer_obj[elem].string.pointer, integer_obj[elem].string.length, &str_value, &value_len); if (ret) continue; } break; case ACPI_TYPE_INTEGER: int_value = (u32)integer_obj[elem].integer.value; break; default: pr_warn("Unsupported object type [%d]\n", integer_obj[elem].type); continue; } /* Check that both expected and read object type match */ if (expected_integer_types[eloc] != integer_obj[elem].type) { pr_err("Error expected type %d for elem %d, but got type %d instead\n", expected_integer_types[eloc], elem, integer_obj[elem].type); kfree(str_value); return -EIO; } /* Assign appropriate element value to corresponding field*/ switch (eloc) { case VALUE: ret = kstrtoint(str_value, 10, &int_value); if (ret) continue; integer_data->current_value = int_value; break; case PATH: strscpy(integer_data->common.path, str_value); break; case IS_READONLY: integer_data->common.is_readonly = int_value; break; case DISPLAY_IN_UI: integer_data->common.display_in_ui = int_value; break; case REQUIRES_PHYSICAL_PRESENCE: integer_data->common.requires_physical_presence = int_value; break; case SEQUENCE: integer_data->common.sequence = int_value; break; case PREREQUISITES_SIZE: if (int_value > MAX_PREREQUISITES_SIZE) { pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n"); int_value = MAX_PREREQUISITES_SIZE; } integer_data->common.prerequisites_size = int_value; /* * This step is needed to keep the expected * element list pointing to the right obj[elem].type * when the size is zero. PREREQUISITES * object is omitted by BIOS when the size is * zero. */ if (integer_data->common.prerequisites_size == 0) eloc++; break; case PREREQUISITES: size = min_t(u32, integer_data->common.prerequisites_size, MAX_PREREQUISITES_SIZE); for (reqs = 0; reqs < size; reqs++) { if (elem >= integer_obj_count) { pr_err("Error elem-objects package is too small\n"); return -EINVAL; } ret = hp_convert_hexstr_to_str(integer_obj[elem + reqs].string.pointer, integer_obj[elem + reqs].string.length, &str_value, &value_len); if (ret) continue; strscpy(integer_data->common.prerequisites[reqs], str_value); kfree(str_value); str_value = NULL; } break; case SECURITY_LEVEL: integer_data->common.security_level = int_value; break; case INT_LOWER_BOUND: integer_data->lower_bound = int_value; break; case INT_UPPER_BOUND: integer_data->upper_bound = int_value; break; case INT_SCALAR_INCREMENT: integer_data->scalar_increment = int_value; break; default: pr_warn("Invalid element: %d found in Integer attribute or data may be malformed\n", elem); break; } kfree(str_value); str_value = NULL; } exit_integer_package: kfree(str_value); return 0; } /** * hp_populate_integer_package_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 hp_populate_integer_package_data(union acpi_object *integer_obj, int instance_id, struct kobject *attr_name_kobj) { struct integer_data *integer_data = &bioscfg_drv.integer_data[instance_id]; integer_data->attr_name_kobj = attr_name_kobj; hp_populate_integer_elements_from_package(integer_obj, integer_obj->package.count, instance_id); hp_update_attribute_permissions(integer_data->common.is_readonly, &integer_current_val); hp_friendly_user_name_update(integer_data->common.path, attr_name_kobj->name, integer_data->common.display_name, sizeof(integer_data->common.display_name)); return sysfs_create_group(attr_name_kobj, &integer_attr_group); } static int hp_populate_integer_elements_from_buffer(u8 *buffer_ptr, u32 *buffer_size, int instance_id) { char *dst = NULL; int dst_size = *buffer_size / sizeof(u16); struct integer_data *integer_data = &bioscfg_drv.integer_data[instance_id]; int ret = 0; dst = kcalloc(dst_size, sizeof(char), GFP_KERNEL); if (!dst) return -ENOMEM; /* * Only data relevant to this driver and its functionality is * read. BIOS defines the order in which each * element is * read. Element 0 data is not relevant to this * driver hence it is ignored. For clarity, all element names * (DISPLAY_IN_UI) which defines the order in which is read * and the name matches the variable where the data is stored. * * In earlier implementation, reported errors were ignored * causing the data to remain uninitialized. It is not * possible to determine if data read from BIOS is valid or * not. It is for this reason functions may return a error * without validating the data itself. */ // VALUE: integer_data->current_value = 0; hp_get_string_from_buffer(&buffer_ptr, buffer_size, dst, dst_size); ret = kstrtoint(dst, 10, &integer_data->current_value); if (ret) pr_warn("Unable to convert string to integer: %s\n", dst); kfree(dst); // COMMON: ret = hp_get_common_data_from_buffer(&buffer_ptr, buffer_size, &integer_data->common); if (ret < 0) goto buffer_exit; // INT_LOWER_BOUND: ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, &integer_data->lower_bound); if (ret < 0) goto buffer_exit; // INT_UPPER_BOUND: ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, &integer_data->upper_bound); if (ret < 0) goto buffer_exit; // INT_SCALAR_INCREMENT: ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, &integer_data->scalar_increment); buffer_exit: return ret; } /** * hp_populate_integer_buffer_data() - * Populate all properties of an instance under integer attribute * * @buffer_ptr: Buffer pointer * @buffer_size: Buffer size * @instance_id: The instance to enumerate * @attr_name_kobj: The parent kernel object */ int hp_populate_integer_buffer_data(u8 *buffer_ptr, u32 *buffer_size, int instance_id, struct kobject *attr_name_kobj) { struct integer_data *integer_data = &bioscfg_drv.integer_data[instance_id]; int ret = 0; integer_data->attr_name_kobj = attr_name_kobj; /* Populate integer elements */ ret = hp_populate_integer_elements_from_buffer(buffer_ptr, buffer_size, instance_id); if (ret < 0) return ret; hp_update_attribute_permissions(integer_data->common.is_readonly, &integer_current_val); hp_friendly_user_name_update(integer_data->common.path, attr_name_kobj->name, integer_data->common.display_name, sizeof(integer_data->common.display_name)); return sysfs_create_group(attr_name_kobj, &integer_attr_group); } /** * hp_exit_integer_attributes() - Clear all attribute data * * Clears all data allocated for this group of attributes */ void hp_exit_integer_attributes(void) { int instance_id; for (instance_id = 0; instance_id < bioscfg_drv.integer_instances_count; instance_id++) { struct kobject *attr_name_kobj = bioscfg_drv.integer_data[instance_id].attr_name_kobj; if (attr_name_kobj) sysfs_remove_group(attr_name_kobj, &integer_attr_group); } bioscfg_drv.integer_instances_count = 0; kfree(bioscfg_drv.integer_data); bioscfg_drv.integer_data = NULL; }
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