Add common functions 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@xxxxxx>
---
Based on the latest platform-drivers-x86.git/for-next
---
drivers/platform/x86/hp/hp-bioscfg/bioscfg.c | 1055 ++++++++++++++++++
1 file changed, 1055 insertions(+)
create mode 100644 drivers/platform/x86/hp/hp-bioscfg/bioscfg.c
diff --git a/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c b/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c
new file mode 100644
index 000000000000..b0a94640ff6f
--- /dev/null
+++ b/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c
@@ -0,0 +1,1055 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Common methods for use with hp-bioscfg driver
+ *
+ * Copyright (c) 2022 HP Development Company, L.P.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/wmi.h>
+#include "bioscfg.h"
+#include "../../firmware_attributes_class.h"
+#include <linux/nls.h>
+#include <linux/errno.h>
+
+MODULE_AUTHOR("Jorge Lopez <jorge.lopez2@xxxxxx>");
+MODULE_DESCRIPTION("HP BIOS Configuration Driver");
+MODULE_LICENSE("GPL");
+
+struct bioscfg_priv bioscfg_drv = {
+ .mutex = __MUTEX_INITIALIZER(bioscfg_drv.mutex),
+};
+
+static struct class *fw_attr_class;
+
+ssize_t display_name_language_code_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ return sysfs_emit(buf, "%s\n", LANG_CODE_STR);
+}
+
+struct kobj_attribute common_display_langcode =
+ __ATTR_RO(display_name_language_code);
+
+int hp_get_integer_from_buffer(u8 **buffer, u32 *buffer_size, u32 *integer)
+{
+ int *ptr = PTR_ALIGN((int *)*buffer, sizeof(int));
+
+ /* Ensure there is enough space remaining to read the integer */
+ if (*buffer_size < sizeof(int))
+ return -EINVAL;
+
+ *integer = *(ptr++);
+ *buffer = (u8 *)ptr;
+ *buffer_size -= sizeof(int);
+
+ return 0;
+}
+
+int hp_get_string_from_buffer(u8 **buffer, u32 *buffer_size, char *dst, u32 dst_size)
+{
+ u16 *src = (u16 *)*buffer;
+ u16 src_size;
+
+ u16 size;
+ int i;
+ int conv_dst_size;
+
+ if (*buffer_size < sizeof(u16))
+ return -EINVAL;
+
+ src_size = *(src++);
+ /* size value in u16 chars */
+ size = src_size / sizeof(u16);
+
+ /* Ensure there is enough space remaining to read and convert
+ * the string
+ */
+ if (*buffer_size < src_size)
+ return -EINVAL;
+
+ for (i = 0; i < size; i++)
+ if (src[i] == '\\' ||
+ src[i] == '\r' ||
+ src[i] == '\n' ||
+ src[i] == '\t')
+ size++;
+
+ /*
+ * Conversion is limited to destination string max number of
+ * bytes.
+ */
+ conv_dst_size = size;
+ if (size > dst_size)
+ conv_dst_size = dst_size - 1;
+
+ /*
+ * convert from UTF-16 unicode to ASCII
+ */
+ utf16s_to_utf8s(src, src_size, UTF16_HOST_ENDIAN, dst, conv_dst_size);
+ dst[conv_dst_size] = 0;
+
+ for (i = 0; i < size && i < conv_dst_size; i++) {
+ if (*src == '\\' ||
+ *src == '\r' ||
+ *src == '\n' ||
+ *src == '\t')
+ dst[i++] = '\\';
+
+ if (*src == '\r')
+ dst[i] = 'r';
+ else if (*src == '\n')
+ dst[i] = 'n';
+ else if (*src == '\t')
+ dst[i] = 't';
+ else if (*src == '"')
+ dst[i] = '\'';
+ else
+ dst[i] = *src;
+ src++;
+ }
+
+ *buffer = (u8 *)src;
+ *buffer_size -= size * sizeof(u16);
+
+ return size;
+}
+
+int hp_get_common_data_from_buffer(u8 **buffer_ptr, u32 *buffer_size,
+ struct common_data *common_data)
+{
+ int ret = 0;
+ int reqs;
+
+ // PATH:
+ ret = hp_get_string_from_buffer(buffer_ptr, buffer_size, common_data->path,
+ sizeof(common_data->path));
+ if (ret < 0)
+ goto common_exit;
+
+ // IS_READONLY:
+ ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size,
+ &common_data->is_readonly);
+ if (ret < 0)
+ goto common_exit;
+
+ //DISPLAY_IN_UI:
+ ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size,
+ &common_data->display_in_ui);
+ if (ret < 0)
+ goto common_exit;
+
+ // REQUIRES_PHYSICAL_PRESENCE:
+ ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size,
+ &common_data->requires_physical_presence);
+ if (ret < 0)
+ goto common_exit;
+
+ // SEQUENCE:
+ ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size,
+ &common_data->sequence);
+ if (ret < 0)
+ goto common_exit;
+
+ // PREREQUISITES_SIZE:
+ ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size,
+ &common_data->prerequisites_size);
+ if (ret < 0)
+ goto common_exit;
+
+ if (common_data->prerequisites_size > MAX_PREREQUISITES_SIZE) {
+ /* Report a message and limit prerequisite size to maximum value */
+ pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n");
+ common_data->prerequisites_size = MAX_PREREQUISITES_SIZE;
+ }
+
+ // PREREQUISITES:
+ for (reqs = 0; reqs < common_data->prerequisites_size; reqs++) {
+ ret = hp_get_string_from_buffer(buffer_ptr, buffer_size,
+ common_data->prerequisites[reqs],
+ sizeof(common_data->prerequisites[reqs]));
+ if (ret < 0)
+ break;
+ }
+
+ // SECURITY_LEVEL:
+ ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size,
+ &common_data->security_level);
+
+common_exit:
+ return ret;
+}
+
+int hp_enforce_single_line_input(char *buf, size_t count)
+{
+ char *p;
+
+ p = memchr(buf, '\n', count);
+
+ if (p == buf + count - 1)
+ *p = '\0'; /* strip trailing newline */
+ else if (p)
+ return -EINVAL; /* enforce single line input */
+
+ return 0;
+}
+
+/* Set pending reboot value and generate KOBJ_NAME event */
+void hp_set_reboot_and_signal_event(void)
+{
+ bioscfg_drv.pending_reboot = true;
+ kobject_uevent(&bioscfg_drv.class_dev->kobj, KOBJ_CHANGE);
+}
+
+/**
+ * hp_calculate_string_buffer() - determines size of string buffer for
+ * use with BIOS communication
+ *
+ * @str: the string to calculate based upon
+ */
+size_t hp_calculate_string_buffer(const char *str)
+{
+ size_t length = strlen(str);
+
+ /* BIOS expects 4 bytes when an empty string is found */
+ if (length == 0)
+ return 4;
+
+ /* u16 length field + one UTF16 char for each input char */
+ return sizeof(u16) + strlen(str) * sizeof(u16);
+}
+
+int hp_wmi_error_and_message(int error_code)
+{
+ char *error_msg = NULL;
+ int ret;
+
+ switch (error_code) {
+ case SUCCESS:
+ error_msg = "Success";
+ ret = 0;
+ break;
+ case CMD_FAILED:
+ error_msg = "Command failed";
+ ret = -EINVAL;
+ break;
+ case INVALID_SIGN:
+ error_msg = "Invalid signature";
+ ret = -EINVAL;
+ break;
+ case INVALID_CMD_VALUE:
+ error_msg = "Invalid command value/Feature not supported";
+ ret = -EOPNOTSUPP;
+ break;
+ case INVALID_CMD_TYPE:
+ error_msg = "Invalid command type";
+ ret = -EINVAL;
+ break;
+ case INVALID_DATA_SIZE:
+ error_msg = "Invalid data size";
+ ret = -EINVAL;
+ break;
+ case INVALID_CMD_PARAM:
+ error_msg = "Invalid command parameter";
+ ret = -EINVAL;
+ break;
+ case ENCRYP_CMD_REQUIRED:
+ error_msg = "Secure/encrypted command required";
+ ret = -EACCES;
+ break;
+ case NO_SECURE_SESSION:
+ error_msg = "No secure session established";
+ ret = -EACCES;
+ break;
+ case SECURE_SESSION_FOUND:
+ error_msg = "Secure session already established";
+ ret = -EACCES;
+ break;
+ case SECURE_SESSION_FAILED:
+ error_msg = "Secure session failed";
+ ret = -EIO;
+ break;
+ case AUTH_FAILED:
+ error_msg = "Other permission/Authentication failed";
+ ret = -EACCES;
+ break;
+ case INVALID_BIOS_AUTH:
+ error_msg = "Invalid BIOS administrator password";
+ ret = -EINVAL;
+ break;
+ case NONCE_DID_NOT_MATCH:
+ error_msg = "Nonce did not match";
+ ret = -EINVAL;
+ break;
+ case GENERIC_ERROR:
+ error_msg = "Generic/Other error";
+ ret = -EIO;
+ break;
+ case BIOS_ADMIN_POLICY_NOT_MET:
+ error_msg = "BIOS Admin password does not meet password policy requirements";
+ ret = -EINVAL;
+ break;
+ case BIOS_ADMIN_NOT_SET:
+ error_msg = "BIOS Setup password is not set";
+ ret = -EPERM;
+ break;
+ case P21_NO_PROVISIONED:
+ error_msg = "P21 is not provisioned";
+ ret = -EPERM;
+ break;
+ case P21_PROVISION_IN_PROGRESS:
+ error_msg = "P21 is already provisioned or provisioning is in progress and a signing key has already been sent";
+ ret = -EINPROGRESS;
+ break;
+ case P21_IN_USE:
+ error_msg = "P21 in use (cannot deprovision)";
+ ret = -EPERM;
+ break;
+ case HEP_NOT_ACTIVE:
+ error_msg = "HEP not activated";
+ ret = -EPERM;
+ break;
+ case HEP_ALREADY_SET:
+ error_msg = "HEP Transport already set";
+ ret = -EINVAL;
+ break;
+ case HEP_CHECK_STATE:
+ error_msg = "Check the current HEP state";
+ ret = -EINVAL;
+ break;
+ default:
+ error_msg = "Generic/Other error";
+ ret = -EIO;
+ break;
+ }
+
+ if (error_code)
+ pr_warn_ratelimited("Returned error 0x%x, \"%s\"\n", error_code, error_msg);
+
+ return ret;
+}
+
+static ssize_t pending_reboot_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ return sysfs_emit(buf, "%d\n", bioscfg_drv.pending_reboot);
+}
+
+static struct kobj_attribute pending_reboot = __ATTR_RO(pending_reboot);
+
+/*
+ * create_attributes_level_sysfs_files() - Creates pending_reboot attributes
+ */
+static int create_attributes_level_sysfs_files(void)
+{
+ return sysfs_create_file(&bioscfg_drv.main_dir_kset->kobj,
+ &pending_reboot.attr);
+}
+
+static void attr_name_release(struct kobject *kobj)
+{
+ kfree(kobj);
+}
+
+static const struct kobj_type attr_name_ktype = {
+ .release = attr_name_release,
+ .sysfs_ops = &kobj_sysfs_ops,
+};
+
+/**
+ * hp_get_wmiobj_pointer() - Get Content of WMI block for particular instance
+ *
+ * @instance_id: WMI instance ID
+ * @guid_string: WMI GUID (in str form)
+ *
+ * Fetches the content for WMI block (instance_id) under GUID (guid_string)
+ * Caller must kfree the return
+ */
+union acpi_object *hp_get_wmiobj_pointer(int instance_id, const char *guid_string)
+{
+ struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
+ acpi_status status;
+
+ status = wmi_query_block(guid_string, instance_id, &out);
+ return ACPI_SUCCESS(status) ? (union acpi_object *)out.pointer : NULL;
+}
+
+/**
+ * hp_get_instance_count() - Compute total number of instances under guid_string
+ *
+ * @guid_string: WMI GUID (in string form)
+ */
+int hp_get_instance_count(const char *guid_string)
+{
+ union acpi_object *wmi_obj = NULL;
+ int i = 0;
+
+ do {
+ kfree(wmi_obj);
+ wmi_obj = hp_get_wmiobj_pointer(i, guid_string);
+ i++;
+ } while (wmi_obj);
+
+ return i - 1;
+}
+
+/**
+ * hp_alloc_attributes_data() - Allocate attributes data for a particular type
+ *
+ * @attr_type: Attribute type to allocate
+ */
+static int hp_alloc_attributes_data(int attr_type)
+{
+ switch (attr_type) {
+ case HPWMI_STRING_TYPE:
+ return hp_alloc_string_data();
+
+ case HPWMI_INTEGER_TYPE:
+ return hp_alloc_integer_data();
+
+ case HPWMI_ENUMERATION_TYPE:
+ return hp_alloc_enumeration_data();
+
+ case HPWMI_ORDERED_LIST_TYPE:
+ return hp_alloc_ordered_list_data();
+
+ case HPWMI_PASSWORD_TYPE:
+ return hp_alloc_password_data();
+
+ default:
+ return 0;
+ }
+}
+
+int hp_convert_hexstr_to_str(const char *input, u32 input_len, char **str, int *len)
+{
+ int ret = 0;
+ int new_len = 0;
+ char tmp[] = "0x00";
+ char *new_str = NULL;
+ long ch;
+ int i;
+
+ if (input_len <= 0 || !input || !str || !len)
+ return -EINVAL;
+
+ *len = 0;
+ *str = NULL;
+
+ new_str = kmalloc(input_len, GFP_KERNEL);
+ if (!new_str)
+ return -ENOMEM;
+
+ for (i = 0; i < input_len; i += 5) {
+ strncpy(tmp, input + i, strlen(tmp));
+ if (kstrtol(tmp, 16, &ch) == 0) {
+ // escape char
+ if (ch == '\\' ||
+ ch == '\r' ||
+ ch == '\n' || ch == '\t') {
+ if (ch == '\r')
+ ch = 'r';
+ else if (ch == '\n')
+ ch = 'n';
+ else if (ch == '\t')
+ ch = 't';
+ new_str[new_len++] = '\\';
+ }
+ new_str[new_len++] = ch;
+ if (ch == '\0')
+ break;
+ }
+ }
+
+ if (new_len) {
+ new_str[new_len] = '\0';
+ *str = krealloc(new_str, (new_len + 1) * sizeof(char),
+ GFP_KERNEL);
+ if (*str)
+ *len = new_len;
+ else
+ ret = -ENOMEM;
+ } else {
+ ret = -EFAULT;
+ }
+
+ if (ret)
+ kfree(new_str);
+ return ret;
+}
+
+/* map output size to the corresponding WMI method id */
+int hp_encode_outsize_for_pvsz(int outsize)
+{
+ if (outsize > 4096)
+ return -EINVAL;
+ if (outsize > 1024)
+ return 5;
+ if (outsize > 128)
+ return 4;
+ if (outsize > 4)
+ return 3;
+ if (outsize > 0)
+ return 2;
+ return 1;
+}
+
+/*
+ * Update friendly display name for several attributes associated to
+ * 'Schedule Power-On'
+ */
+void hp_friendly_user_name_update(char *path, const char *attr_name,
+ char *attr_display, int attr_size)
+{
+ if (strstr(path, SCHEDULE_POWER_ON))
+ snprintf(attr_display, attr_size, "%s - %s", SCHEDULE_POWER_ON, attr_name);
+ else
+ strscpy(attr_display, attr_name, attr_size);
+}
+
+/**
+ * hp_update_attribute_permissions() - Update attributes permissions when
+ * isReadOnly value is 1
+ *
+ * @is_readonly: bool value to indicate if it a readonly attribute.
+ * @current_val: kobj_attribute corresponding to attribute.
+ *
+ */
+void hp_update_attribute_permissions(bool is_readonly, struct kobj_attribute *current_val)
+{
+ current_val->attr.mode = is_readonly ? 0444 : 0644;
+}
+
+/**
+ * destroy_attribute_objs() - Free a kset of kobjects
+ * @kset: The kset to destroy
+ *
+ * Fress kobjects created for each attribute_name under attribute type kset
+ */
+static void destroy_attribute_objs(struct kset *kset)
+{
+ struct kobject *pos, *next;
+
+ list_for_each_entry_safe(pos, next, &kset->list, entry)
+ kobject_put(pos);
+}
+
+/**
+ * release_attributes_data() - Clean-up all sysfs directories and files created
+ */
+static void release_attributes_data(void)
+{
+ mutex_lock(&bioscfg_drv.mutex);
+
+ hp_exit_string_attributes();
+ hp_exit_integer_attributes();
+ hp_exit_enumeration_attributes();
+ hp_exit_ordered_list_attributes();
+ hp_exit_password_attributes();
+ hp_exit_sure_start_attributes();
+ hp_exit_secure_platform_attributes();
+
+ if (bioscfg_drv.authentication_dir_kset) {
+ destroy_attribute_objs(bioscfg_drv.authentication_dir_kset);
+ kset_unregister(bioscfg_drv.authentication_dir_kset);
+ bioscfg_drv.authentication_dir_kset = NULL;
+ }
+ if (bioscfg_drv.main_dir_kset) {
+ sysfs_remove_file(&bioscfg_drv.main_dir_kset->kobj, &pending_reboot.attr);
+ destroy_attribute_objs(bioscfg_drv.main_dir_kset);
+ kset_unregister(bioscfg_drv.main_dir_kset);
+ bioscfg_drv.main_dir_kset = NULL;
+ }
+ mutex_unlock(&bioscfg_drv.mutex);
+}
+
+/**
+ * hp_add_other_attributes() - Initialize HP custom attributes not
+ * reported by BIOS and required to support Secure Platform and Sure
+ * Start.
+ *
+ * @attr_type: Custom HP attribute not reported by BIOS
+ *
+ * Initialize all 2 types of attributes: Platform and Sure Start
+ * object. Populates each attribute types respective properties
+ * under sysfs files.
+ *
+ * Returns zero(0) if successful. Otherwise, a negative value.
+ */
+static int hp_add_other_attributes(int attr_type)
+{
+ struct kobject *attr_name_kobj;
+ union acpi_object *obj = NULL;
+ int ret;
+ char *attr_name;
+
+ mutex_lock(&bioscfg_drv.mutex);
+
+ attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL);
+ if (!attr_name_kobj) {
+ ret = -ENOMEM;
+ goto err_other_attr_init;
+ }
+
+ /* Check if attribute type is supported */
+ switch (attr_type) {
+ case HPWMI_SECURE_PLATFORM_TYPE:
+ attr_name_kobj->kset = bioscfg_drv.authentication_dir_kset;
+ attr_name = SPM_STR;
+ break;
+
+ case HPWMI_SURE_START_TYPE:
+ attr_name_kobj->kset = bioscfg_drv.main_dir_kset;
+ attr_name = SURE_START_STR;
+ break;
+
+ default:
+ pr_err("Error: Unknown attr_type: %d\n", attr_type);
+ ret = -EINVAL;
+ goto err_other_attr_init;
+ }
+
+ ret = kobject_init_and_add(attr_name_kobj, &attr_name_ktype,
+ NULL, "%s", attr_name);
+ if (ret) {
+ pr_err("Error encountered [%d]\n", ret);
+ kobject_put(attr_name_kobj);
+ goto err_other_attr_init;
+ }
+
+ /* Populate attribute data */
+ switch (attr_type) {
+ case HPWMI_SECURE_PLATFORM_TYPE:
+ ret = hp_populate_secure_platform_data(attr_name_kobj);
+ break;
+
+ case HPWMI_SURE_START_TYPE:
+ ret = hp_populate_sure_start_data(attr_name_kobj);
+ break;
+
+ default:
+ goto err_other_attr_init;
+ }
+
+ mutex_unlock(&bioscfg_drv.mutex);
+ return 0;
+
+err_other_attr_init:
+ mutex_unlock(&bioscfg_drv.mutex);
+ kfree(obj);
+ return ret;
+}
+
+static int hp_init_bios_package_attribute(enum hp_wmi_data_type attr_type,
+ union acpi_object *obj,
+ const char *guid, int min_elements,
+ int instance_id)
+{
+ struct kobject *attr_name_kobj;
+ union acpi_object *elements;
+ struct kset *temp_kset;
+
+ char *str_value = NULL;
+ int str_len;
+ int ret = 0;
+
+ /* Take action appropriate to each ACPI TYPE */
+ if (obj->package.count < min_elements) {
+ pr_err("ACPI-package does not have enough elements: %d < %d\n",
+ obj->package.count, min_elements);
+ goto pack_attr_exit;
+ }
+
+ elements = obj->package.elements;
+
+ /* sanity checking */
+ if (elements[NAME].type != ACPI_TYPE_STRING) {
+ pr_debug("incorrect element type\n");
+ goto pack_attr_exit;
+ }
+ if (strlen(elements[NAME].string.pointer) == 0) {
+ pr_debug("empty attribute found\n");
+ goto pack_attr_exit;
+ }
+
+ if (attr_type == HPWMI_PASSWORD_TYPE)
+ temp_kset = bioscfg_drv.authentication_dir_kset;
+ else
+ temp_kset = bioscfg_drv.main_dir_kset;
+
+ /* convert attribute name to string */
+ ret = hp_convert_hexstr_to_str(elements[NAME].string.pointer,
+ elements[NAME].string.length,
+ &str_value, &str_len);
+
+ if (ret) {
+ pr_debug("Failed to populate integer package data. Error [0%0x]\n",
+ ret);
+ kfree(str_value);
+ return ret;
+ }
+
+ /* All duplicate attributes found are ignored */
+ if (kset_find_obj(temp_kset, str_value)) {
+ pr_debug("Duplicate attribute name found - %s\n", str_value);
+ goto pack_attr_exit;
+ }
+
+ /* build attribute */
+ attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL);
+ if (!attr_name_kobj) {
+ ret = -ENOMEM;
+ goto pack_attr_exit;
+ }
+
+ attr_name_kobj->kset = temp_kset;
+
+ ret = kobject_init_and_add(attr_name_kobj, &attr_name_ktype,
+ NULL, "%s", str_value);
+
+ if (ret) {
+ kobject_put(attr_name_kobj);
+ goto pack_attr_exit;
+ }
+
+ /* enumerate all of these attributes */
+ switch (attr_type) {
+ case HPWMI_STRING_TYPE:
+ ret = hp_populate_string_package_data(elements,
+ instance_id,
+ attr_name_kobj);
+ break;
+ case HPWMI_INTEGER_TYPE:
+ ret = hp_populate_integer_package_data(elements,
+ instance_id,
+ attr_name_kobj);
+ break;
+ case HPWMI_ENUMERATION_TYPE:
+ ret = hp_populate_enumeration_package_data(elements,
+ instance_id,
+ attr_name_kobj);
+ break;
+ case HPWMI_ORDERED_LIST_TYPE:
+ ret = hp_populate_ordered_list_package_data(elements,
+ instance_id,
+ attr_name_kobj);
+ break;
+ case HPWMI_PASSWORD_TYPE:
+ ret = hp_populate_password_package_data(elements,
+ instance_id,
+ attr_name_kobj);
+ break;
+ default:
+ pr_debug("Unknown attribute type found: 0x%x\n", attr_type);
+ break;
+ }
+
+pack_attr_exit:
+ kfree(str_value);
+ return ret;
+}
+
+static int hp_init_bios_buffer_attribute(enum hp_wmi_data_type attr_type,
+ union acpi_object *obj,
+ const char *guid, int min_elements,
+ int instance_id)
+{
+ struct kobject *attr_name_kobj;
+ struct kset *temp_kset;
+ char str[MAX_BUFF_SIZE];
+
+ char *temp_str = NULL;
+ char *str_value = NULL;
+ u8 *buffer_ptr = NULL;
+ int buffer_size;
+ int ret = 0;
+
+ buffer_size = obj->buffer.length;
+ buffer_ptr = obj->buffer.pointer;
+
+ ret = hp_get_string_from_buffer(&buffer_ptr,
+ &buffer_size, str, MAX_BUFF_SIZE);
+
+ if (ret < 0)
+ goto buff_attr_exit;
+
+ if (attr_type == HPWMI_PASSWORD_TYPE ||
+ attr_type == HPWMI_SECURE_PLATFORM_TYPE)
+ temp_kset = bioscfg_drv.authentication_dir_kset;
+ else
+ temp_kset = bioscfg_drv.main_dir_kset;
+
+ /* All duplicate attributes found are ignored */
+ if (kset_find_obj(temp_kset, str)) {
+ pr_debug("Duplicate attribute name found - %s\n", str);
+ goto buff_attr_exit;
+ }
+
+ /* build attribute */
+ attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL);
+ if (!attr_name_kobj) {
+ ret = -ENOMEM;
+ goto buff_attr_exit;
+ }
+
+ attr_name_kobj->kset = temp_kset;
+
+ temp_str = str;
+ if (attr_type == HPWMI_SECURE_PLATFORM_TYPE)
+ temp_str = "SPM";
+
+ ret = kobject_init_and_add(attr_name_kobj,
+ &attr_name_ktype, NULL, "%s", temp_str);
+ if (ret) {
+ kobject_put(attr_name_kobj);
+ goto buff_attr_exit;
+ }
+
+ /* enumerate all of these attributes */
+ switch (attr_type) {
+ case HPWMI_STRING_TYPE:
+ ret = hp_populate_string_buffer_data(buffer_ptr,
+ &buffer_size,
+ instance_id,
+ attr_name_kobj);
+ break;
+ case HPWMI_INTEGER_TYPE:
+ ret = hp_populate_integer_buffer_data(buffer_ptr,
+ &buffer_size,
+ instance_id,
+ attr_name_kobj);
+ break;
+ case HPWMI_ENUMERATION_TYPE:
+ ret = hp_populate_enumeration_buffer_data(buffer_ptr,
+ &buffer_size,
+ instance_id,
+ attr_name_kobj);
+ break;
+ case HPWMI_ORDERED_LIST_TYPE:
+ ret = hp_populate_ordered_list_buffer_data(buffer_ptr,
+ &buffer_size,
+ instance_id,
+ attr_name_kobj);
+ break;
+ case HPWMI_PASSWORD_TYPE:
+ ret = hp_populate_password_buffer_data(buffer_ptr,
+ &buffer_size,
+ instance_id,
+ attr_name_kobj);
+ break;
+ default:
+ pr_debug("Unknown attribute type found: 0x%x\n", attr_type);
+ break;
+ }
+
+buff_attr_exit:
+ kfree(str_value);
+ return ret;
+}
+
+/**
+ * hp_init_bios_attributes() - Initialize all attributes for a type
+ * @attr_type: The attribute type to initialize
+ * @guid: The WMI GUID associated with this type to initialize
+ *
+ * Initialize all 5 types of attributes: enumeration, integer,
+ * string, password, ordered list object. Populates each attribute types
+ * respective properties under sysfs files
+ */
+static int hp_init_bios_attributes(enum hp_wmi_data_type attr_type, const char *guid)
+{
+ union acpi_object *obj = NULL;
+ int min_elements;
+
+ /* instance_id needs to be reset for each type GUID
+ * also, instance IDs are unique within GUID but not across
+ */
+ int instance_id = 0;
+ int cur_instance_id = instance_id;
+ int ret = 0;
+
+ ret = hp_alloc_attributes_data(attr_type);
+ if (ret)
+ return ret;
+
+ switch (attr_type) {
+ case HPWMI_STRING_TYPE:
+ min_elements = STR_ELEM_CNT;
+ break;
+ case HPWMI_INTEGER_TYPE:
+ min_elements = INT_ELEM_CNT;
+ break;
+ case HPWMI_ENUMERATION_TYPE:
+ min_elements = ENUM_ELEM_CNT;
+ break;
+ case HPWMI_ORDERED_LIST_TYPE:
+ min_elements = ORD_ELEM_CNT;
+ break;
+ case HPWMI_PASSWORD_TYPE:
+ min_elements = PSWD_ELEM_CNT;
+ break;
+ default:
+ pr_err("Error: Unknown attr_type: %d\n", attr_type);
+ return -EINVAL;
+ }
+
+ /* need to use specific instance_id and guid combination to get right data */
+ obj = hp_get_wmiobj_pointer(instance_id, guid);
+ if (!obj)
+ return -ENODEV;
+
+ mutex_lock(&bioscfg_drv.mutex);
+ while (obj) {
+ /* Take action appropriate to each ACPI TYPE */
+ if (obj->type == ACPI_TYPE_PACKAGE) {
+ ret = hp_init_bios_package_attribute(attr_type, obj,
+ guid, min_elements,
+ cur_instance_id);
+
+ } else if (obj->type == ACPI_TYPE_BUFFER) {
+ ret = hp_init_bios_buffer_attribute(attr_type, obj,
+ guid, min_elements,
+ cur_instance_id);
+
+ } else {
+ pr_err("Expected ACPI-package or buffer type, got: %d\n",
+ obj->type);
+ ret = -EIO;
+ goto err_attr_init;
+ }
+
+ /*
+ * Failure reported in one attribute must not
+ * stop process of the remaining attribute values.
+ */
+ if (ret >= 0)
+ cur_instance_id++;
+
+ kfree(obj);
+ instance_id++;
+ obj = hp_get_wmiobj_pointer(instance_id, guid);
+ }
+
+err_attr_init:
+ mutex_unlock(&bioscfg_drv.mutex);
+ kfree(obj);
+ return ret;
+}
+
+static int __init hp_init(void)
+{
+ int ret;
+ int hp_bios_capable = wmi_has_guid(HP_WMI_BIOS_GUID);
+ int set_bios_settings = wmi_has_guid(HP_WMI_SET_BIOS_SETTING_GUID);
+
+ if (!hp_bios_capable) {
+ pr_err("Unable to run on non-HP system\n");
+ return -ENODEV;
+ }
+
+ if (!set_bios_settings) {
+ pr_err("Unable to set BIOS settings on HP systems\n");
+ return -ENODEV;
+ }
+
+ ret = hp_init_attr_set_interface();
+ if (ret)
+ return ret;
+
+ ret = fw_attributes_class_get(&fw_attr_class);
+ if (ret)
+ goto err_unregister_class;
+
+ bioscfg_drv.class_dev = device_create(fw_attr_class, NULL, MKDEV(0, 0),
+ NULL, "%s", DRIVER_NAME);
+ if (IS_ERR(bioscfg_drv.class_dev)) {
+ ret = PTR_ERR(bioscfg_drv.class_dev);
+ goto err_unregister_class;
+ }
+
+ bioscfg_drv.main_dir_kset = kset_create_and_add("attributes", NULL,
+ &bioscfg_drv.class_dev->kobj);
+ if (!bioscfg_drv.main_dir_kset) {
+ ret = -ENOMEM;
+ pr_debug("Failed to create and add attributes\n");
+ goto err_destroy_classdev;
+ }
+
+ bioscfg_drv.authentication_dir_kset = kset_create_and_add("authentication", NULL,
+ &bioscfg_drv.class_dev->kobj);
+ if (!bioscfg_drv.authentication_dir_kset) {
+ ret = -ENOMEM;
+ pr_debug("Failed to create and add authentication\n");
+ goto err_release_attributes_data;
+ }
+
+ /*
+ * sysfs level attributes.
+ * - pending_reboot
+ */
+ ret = create_attributes_level_sysfs_files();
+ if (ret)
+ pr_debug("Failed to create sysfs level attributes\n");
+
+ ret = hp_init_bios_attributes(HPWMI_STRING_TYPE, HP_WMI_BIOS_STRING_GUID);
+ if (ret)
+ pr_debug("Failed to populate string type attributes\n");
+
+ ret = hp_init_bios_attributes(HPWMI_INTEGER_TYPE, HP_WMI_BIOS_INTEGER_GUID);
+ if (ret)
+ pr_debug("Failed to populate integer type attributes\n");
+
+ ret = hp_init_bios_attributes(HPWMI_ENUMERATION_TYPE, HP_WMI_BIOS_ENUMERATION_GUID);
+ if (ret)
+ pr_debug("Failed to populate enumeration type attributes\n");
+
+ ret = hp_init_bios_attributes(HPWMI_ORDERED_LIST_TYPE, HP_WMI_BIOS_ORDERED_LIST_GUID);
+ if (ret)
+ pr_debug("Failed to populate ordered list object type attributes\n");
+
+ ret = hp_init_bios_attributes(HPWMI_PASSWORD_TYPE, HP_WMI_BIOS_PASSWORD_GUID);
+ if (ret)
+ pr_debug("Failed to populate password object type attributes\n");
+
+ bioscfg_drv.spm_data.attr_name_kobj = NULL;
+ ret = hp_add_other_attributes(HPWMI_SECURE_PLATFORM_TYPE);
+ if (ret)
+ pr_debug("Failed to populate secure platform object type attribute\n");
+
+ bioscfg_drv.sure_start_attr_kobj = NULL;
+ ret = hp_add_other_attributes(HPWMI_SURE_START_TYPE);
+ if (ret)
+ pr_debug("Failed to populate sure start object type attribute\n");
+
+ return 0;
+
+err_release_attributes_data:
+ release_attributes_data();
+
+err_destroy_classdev:
+ device_destroy(fw_attr_class, MKDEV(0, 0));
+
+err_unregister_class:
+ fw_attributes_class_put();
+ hp_exit_attr_set_interface();
+
+ return ret;
+}
+
+static void __exit hp_exit(void)
+{
+ release_attributes_data();
+ device_destroy(fw_attr_class, MKDEV(0, 0));
+
+ fw_attributes_class_put();
+ hp_exit_attr_set_interface();
+}
+
+module_init(hp_init);
+module_exit(hp_exit);
--
2.34.1
