// SPDX-License-Identifier: GPL-2.0-or-later /* * Think LMI BIOS configuration driver * * Copyright(C) 2019-2021 Lenovo * * Original code from Thinkpad-wmi project https://github.com/iksaif/thinkpad-wmi * Copyright(C) 2017 Corentin Chary <[email protected]> * Distributed under the GPL-2.0 license */ #define pr_fmt(fmt) … #include <linux/acpi.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/mutex.h> #include <linux/string_helpers.h> #include <linux/types.h> #include <linux/dmi.h> #include <linux/wmi.h> #include "firmware_attributes_class.h" #include "think-lmi.h" static bool debug_support; module_param(debug_support, bool, 0444); MODULE_PARM_DESC(…) …; /* * Name: BiosSetting * Description: Get item name and settings for current LMI instance. * Type: Query * Returns: "Item,Value" * Example: "WakeOnLAN,Enable" */ #define LENOVO_BIOS_SETTING_GUID … /* * Name: SetBiosSetting * Description: Change the BIOS setting to the desired value using the SetBiosSetting * class. To save the settings, use the SaveBiosSetting class. * BIOS settings and values are case sensitive. * After making changes to the BIOS settings, you must reboot the computer * before the changes will take effect. * Type: Method * Arguments: "Item,Value,Password,Encoding,KbdLang;" * Example: "WakeOnLAN,Disable,pa55w0rd,ascii,us;" */ #define LENOVO_SET_BIOS_SETTINGS_GUID … /* * Name: SaveBiosSettings * Description: Save any pending changes in settings. * Type: Method * Arguments: "Password,Encoding,KbdLang;" * Example: "pa55w0rd,ascii,us;" */ #define LENOVO_SAVE_BIOS_SETTINGS_GUID … /* * Name: BiosPasswordSettings * Description: Return BIOS Password settings * Type: Query * Returns: PasswordMode, PasswordState, MinLength, MaxLength, * SupportedEncoding, SupportedKeyboard */ #define LENOVO_BIOS_PASSWORD_SETTINGS_GUID … /* * Name: SetBiosPassword * Description: Change a specific password. * - BIOS settings cannot be changed at the same boot as power-on * passwords (POP) and hard disk passwords (HDP). If you want to change * BIOS settings and POP or HDP, you must reboot the system after changing * one of them. * - A password cannot be set using this method when one does not already * exist. Passwords can only be updated or cleared. * Type: Method * Arguments: "PasswordType,CurrentPassword,NewPassword,Encoding,KbdLang;" * Example: "pop,pa55w0rd,newpa55w0rd,ascii,us;” */ #define LENOVO_SET_BIOS_PASSWORD_GUID … /* * Name: GetBiosSelections * Description: Return a list of valid settings for a given item. * Type: Method * Arguments: "Item" * Returns: "Value1,Value2,Value3,..." * Example: * -> "FlashOverLAN" * <- "Enabled,Disabled" */ #define LENOVO_GET_BIOS_SELECTIONS_GUID … /* * Name: DebugCmd * Description: Debug entry method for entering debug commands to the BIOS */ #define LENOVO_DEBUG_CMD_GUID … /* * Name: OpcodeIF * Description: Opcode interface which provides the ability to set multiple * parameters and then trigger an action with a final command. * This is particularly useful for simplifying setting passwords. * With this support comes the ability to set System, HDD and NVMe * passwords. * This is currently available on ThinkCenter and ThinkStations platforms */ #define LENOVO_OPCODE_IF_GUID … /* * Name: SetBiosCert * Description: Install BIOS certificate. * Type: Method * Arguments: "Certificate,Password" * You must reboot the computer before the changes will take effect. */ #define LENOVO_SET_BIOS_CERT_GUID … /* * Name: UpdateBiosCert * Description: Update BIOS certificate. * Type: Method * Format: "Certificate,Signature" * You must reboot the computer before the changes will take effect. */ #define LENOVO_UPDATE_BIOS_CERT_GUID … /* * Name: ClearBiosCert * Description: Uninstall BIOS certificate. * Type: Method * Format: "Serial,Signature" * You must reboot the computer before the changes will take effect. */ #define LENOVO_CLEAR_BIOS_CERT_GUID … /* * Name: CertToPassword * Description: Switch from certificate to password authentication. * Type: Method * Format: "Password,Signature" * You must reboot the computer before the changes will take effect. */ #define LENOVO_CERT_TO_PASSWORD_GUID … /* * Name: SetBiosSettingCert * Description: Set attribute using certificate authentication. * Type: Method * Format: "Item,Value,Signature" */ #define LENOVO_SET_BIOS_SETTING_CERT_GUID … /* * Name: SaveBiosSettingCert * Description: Save any pending changes in settings. * Type: Method * Format: "Signature" */ #define LENOVO_SAVE_BIOS_SETTING_CERT_GUID … /* * Name: CertThumbprint * Description: Display Certificate thumbprints * Type: Query * Returns: MD5, SHA1 & SHA256 thumbprints */ #define LENOVO_CERT_THUMBPRINT_GUID … #define TLMI_POP_PWD … #define TLMI_PAP_PWD … #define TLMI_HDD_PWD … #define TLMI_SMP_PWD … #define TLMI_CERT … static const struct tlmi_err_codes tlmi_errs[] = …; static const char * const encoding_options[] = …; static const char * const level_options[] = …; static struct think_lmi tlmi_priv; static const struct class *fw_attr_class; static DEFINE_MUTEX(tlmi_mutex); static inline struct tlmi_pwd_setting *to_tlmi_pwd_setting(struct kobject *kobj) { … } static inline struct tlmi_attr_setting *to_tlmi_attr_setting(struct kobject *kobj) { … } /* Convert BIOS WMI error string to suitable error code */ static int tlmi_errstr_to_err(const char *errstr) { … } /* Extract error string from WMI return buffer */ static int tlmi_extract_error(const struct acpi_buffer *output) { … } /* Utility function to execute WMI call to BIOS */ static int tlmi_simple_call(const char *guid, const char *arg) { … } /* Extract output string from WMI return buffer */ static int tlmi_extract_output_string(const struct acpi_buffer *output, char **string) { … } /* ------ Core interface functions ------------*/ /* Get password settings from BIOS */ static int tlmi_get_pwd_settings(struct tlmi_pwdcfg *pwdcfg) { … } static int tlmi_save_bios_settings(const char *password) { … } static int tlmi_opcode_setting(char *setting, const char *value) { … } static int tlmi_setting(int item, char **value, const char *guid_string) { … } static int tlmi_get_bios_selections(const char *item, char **value) { … } /* ---- Authentication sysfs --------------------------------------------------------- */ static ssize_t is_enabled_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static struct kobj_attribute auth_is_pass_set = …; static ssize_t current_password_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute auth_current_password = …; static ssize_t new_password_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute auth_new_password = …; static ssize_t min_password_length_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static struct kobj_attribute auth_min_pass_length = …; static ssize_t max_password_length_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static struct kobj_attribute auth_max_pass_length = …; static ssize_t mechanism_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static struct kobj_attribute auth_mechanism = …; static ssize_t encoding_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static ssize_t encoding_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute auth_encoding = …; static ssize_t kbdlang_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static ssize_t kbdlang_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute auth_kbdlang = …; static ssize_t role_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static struct kobj_attribute auth_role = …; static ssize_t index_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static ssize_t index_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute auth_index = …; static ssize_t level_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static ssize_t level_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute auth_level = …; static ssize_t cert_thumbprint(char *buf, const char *arg, int count) { … } static ssize_t certificate_thumbprint_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static struct kobj_attribute auth_cert_thumb = …; static ssize_t cert_to_password_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute auth_cert_to_password = …; static ssize_t certificate_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute auth_certificate = …; static ssize_t signature_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute auth_signature = …; static ssize_t save_signature_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute auth_save_signature = …; static umode_t auth_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) { … } static struct attribute *auth_attrs[] = …; static const struct attribute_group auth_attr_group = …; /* ---- Attributes sysfs --------------------------------------------------------- */ static ssize_t display_name_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static ssize_t possible_values_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static ssize_t current_value_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute attr_displ_name = …; static struct kobj_attribute attr_possible_values = …; static struct kobj_attribute attr_current_val = …; static struct kobj_attribute attr_type = …; static umode_t attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) { … } static struct attribute *tlmi_attrs[] = …; static const struct attribute_group tlmi_attr_group = …; static void tlmi_attr_setting_release(struct kobject *kobj) { … } static void tlmi_pwd_setting_release(struct kobject *kobj) { … } static const struct kobj_type tlmi_attr_setting_ktype = …; static const struct kobj_type tlmi_pwd_setting_ktype = …; static ssize_t pending_reboot_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static struct kobj_attribute pending_reboot = …; static const char * const save_mode_strings[] = …; static ssize_t save_settings_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { … } static ssize_t save_settings_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute save_settings = …; /* ---- Debug interface--------------------------------------------------------- */ static ssize_t debug_cmd_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { … } static struct kobj_attribute debug_cmd = …; /* ---- Initialisation --------------------------------------------------------- */ static void tlmi_release_attr(void) { … } static int tlmi_validate_setting_name(struct kset *attribute_kset, char *name) { … } static int tlmi_sysfs_init(void) { … } /* ---- Base Driver -------------------------------------------------------- */ static struct tlmi_pwd_setting *tlmi_create_auth(const char *pwd_type, const char *pwd_role) { … } static int tlmi_analyze(void) { … } static void tlmi_remove(struct wmi_device *wdev) { … } static int tlmi_probe(struct wmi_device *wdev, const void *context) { … } static const struct wmi_device_id tlmi_id_table[] = …; MODULE_DEVICE_TABLE(wmi, tlmi_id_table); static struct wmi_driver tlmi_driver = …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; module_wmi_driver(…) …;
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