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318d97849f
On Lenovo platforms there is a limitation in the number of times an attribute can be saved. This is an architectural limitation and it limits the number of attributes that can be modified to 48. A solution for this is instead of the attribute being saved after every modification allow a user to bulk set the attributes and then trigger a final save. This allows unlimited attributes. This patch introduces a save_settings attribute that can be configured to either single or bulk mode by the user. Single mode is the default but customers who want to avoid the 48 attribute limit can enable bulk mode. Displaying the save_settings attribute will display the enabled mode. When in bulk mode writing 'save' to the save_settings attribute will trigger a save. Once this has been done a reboot is required before more attributes can be modified. Signed-off-by: Mark Pearson <mpearson-lenovo@squebb.ca> Link: https://lore.kernel.org/r/20230919141530.4805-1-mpearson-lenovo@squebb.ca Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _THINK_LMI_H_
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#define _THINK_LMI_H_
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#include <linux/types.h>
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#define TLMI_SETTINGS_COUNT 256
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#define TLMI_SETTINGS_MAXLEN 512
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#define TLMI_PWD_BUFSIZE 129
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#define TLMI_LANG_MAXLEN 4
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#define TLMI_INDEX_MAX 32
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/* Possible error values */
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struct tlmi_err_codes {
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const char *err_str;
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int err_code;
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};
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enum encoding_option {
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TLMI_ENCODING_ASCII,
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TLMI_ENCODING_SCANCODE,
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};
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enum level_option {
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TLMI_LEVEL_USER,
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TLMI_LEVEL_MASTER,
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};
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/*
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* There are a limit on the number of WMI operations you can do if you use
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* the default implementation of saving on every set. This is due to a
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* limitation in EFI variable space used.
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* Have a 'bulk save' mode where you can manually trigger the save, and can
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* therefore set unlimited variables - for users that need it.
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*/
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enum save_mode {
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TLMI_SAVE_SINGLE,
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TLMI_SAVE_BULK,
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TLMI_SAVE_SAVE,
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};
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/* password configuration details */
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struct tlmi_pwdcfg_core {
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uint32_t password_mode;
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uint32_t password_state;
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uint32_t min_length;
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uint32_t max_length;
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uint32_t supported_encodings;
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uint32_t supported_keyboard;
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};
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struct tlmi_pwdcfg_ext {
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uint32_t hdd_user_password;
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uint32_t hdd_master_password;
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uint32_t nvme_user_password;
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uint32_t nvme_master_password;
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};
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struct tlmi_pwdcfg {
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struct tlmi_pwdcfg_core core;
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struct tlmi_pwdcfg_ext ext;
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};
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/* password setting details */
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struct tlmi_pwd_setting {
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struct kobject kobj;
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bool valid;
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char password[TLMI_PWD_BUFSIZE];
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const char *pwd_type;
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const char *role;
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int minlen;
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int maxlen;
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enum encoding_option encoding;
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char kbdlang[TLMI_LANG_MAXLEN];
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int index; /*Used for HDD and NVME auth */
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enum level_option level;
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bool cert_installed;
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char *signature;
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char *save_signature;
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};
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/* Attribute setting details */
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struct tlmi_attr_setting {
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struct kobject kobj;
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int index;
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char display_name[TLMI_SETTINGS_MAXLEN];
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char *possible_values;
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};
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struct think_lmi {
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struct wmi_device *wmi_device;
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bool can_set_bios_settings;
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bool can_get_bios_selections;
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bool can_set_bios_password;
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bool can_get_password_settings;
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bool pending_changes;
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bool can_debug_cmd;
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bool opcode_support;
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bool certificate_support;
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enum save_mode save_mode;
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bool save_required;
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bool reboot_required;
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struct tlmi_attr_setting *setting[TLMI_SETTINGS_COUNT];
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struct device *class_dev;
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struct kset *attribute_kset;
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struct kset *authentication_kset;
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struct tlmi_pwdcfg pwdcfg;
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struct tlmi_pwd_setting *pwd_admin;
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struct tlmi_pwd_setting *pwd_power;
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struct tlmi_pwd_setting *pwd_system;
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struct tlmi_pwd_setting *pwd_hdd;
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struct tlmi_pwd_setting *pwd_nvme;
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};
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#endif /* !_THINK_LMI_H_ */
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