diff options
Diffstat (limited to 'drivers/platform/x86/think-lmi.c')
| -rw-r--r-- | drivers/platform/x86/think-lmi.c | 125 |
1 files changed, 116 insertions, 9 deletions
diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c index 3671b5d20613..9472aae72df2 100644 --- a/drivers/platform/x86/think-lmi.c +++ b/drivers/platform/x86/think-lmi.c @@ -20,6 +20,10 @@ #include "firmware_attributes_class.h" #include "think-lmi.h" +static bool debug_support; +module_param(debug_support, bool, 0444); +MODULE_PARM_DESC(debug_support, "Enable debug command support"); + /* * Name: * Lenovo_BiosSetting @@ -116,6 +120,14 @@ */ #define LENOVO_GET_BIOS_SELECTIONS_GUID "7364651A-132F-4FE7-ADAA-40C6C7EE2E3B" +/* + * Name: + * Lenovo_DebugCmdGUID + * Description + * Debug entry GUID method for entering debug commands to the BIOS + */ +#define LENOVO_DEBUG_CMD_GUID "7FF47003-3B6C-4E5E-A227-E979824A85D1" + #define TLMI_POP_PWD (1 << 0) #define TLMI_PAP_PWD (1 << 1) #define to_tlmi_pwd_setting(kobj) container_of(kobj, struct tlmi_pwd_setting, kobj) @@ -571,6 +583,11 @@ static ssize_t current_value_store(struct kobject *kobj, else ret = tlmi_save_bios_settings(""); + if (!ret && !tlmi_priv.pending_changes) { + tlmi_priv.pending_changes = true; + /* let userland know it may need to check reboot pending again */ + kobject_uevent(&tlmi_priv.class_dev->kobj, KOBJ_CHANGE); + } out: kfree(auth_str); kfree(set_str); @@ -647,6 +664,72 @@ static struct kobj_type tlmi_pwd_setting_ktype = { .sysfs_ops = &tlmi_kobj_sysfs_ops, }; +static ssize_t pending_reboot_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + return sprintf(buf, "%d\n", tlmi_priv.pending_changes); +} + +static struct kobj_attribute pending_reboot = __ATTR_RO(pending_reboot); + +/* ---- Debug interface--------------------------------------------------------- */ +static ssize_t debug_cmd_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t count) +{ + char *set_str = NULL, *new_setting = NULL; + char *auth_str = NULL; + char *p; + int ret; + + if (!tlmi_priv.can_debug_cmd) + return -EOPNOTSUPP; + + new_setting = kstrdup(buf, GFP_KERNEL); + if (!new_setting) + return -ENOMEM; + + /* Strip out CR if one is present */ + p = strchrnul(new_setting, '\n'); + *p = '\0'; + + if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) { + auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;", + tlmi_priv.pwd_admin->password, + encoding_options[tlmi_priv.pwd_admin->encoding], + tlmi_priv.pwd_admin->kbdlang); + if (!auth_str) { + ret = -ENOMEM; + goto out; + } + } + + if (auth_str) + set_str = kasprintf(GFP_KERNEL, "%s,%s", new_setting, auth_str); + else + set_str = kasprintf(GFP_KERNEL, "%s;", new_setting); + if (!set_str) { + ret = -ENOMEM; + goto out; + } + + ret = tlmi_simple_call(LENOVO_DEBUG_CMD_GUID, set_str); + if (ret) + goto out; + + if (!ret && !tlmi_priv.pending_changes) { + tlmi_priv.pending_changes = true; + /* let userland know it may need to check reboot pending again */ + kobject_uevent(&tlmi_priv.class_dev->kobj, KOBJ_CHANGE); + } +out: + kfree(auth_str); + kfree(set_str); + kfree(new_setting); + return ret ?: count; +} + +static struct kobj_attribute debug_cmd = __ATTR_WO(debug_cmd); + /* ---- Initialisation --------------------------------------------------------- */ static void tlmi_release_attr(void) { @@ -659,6 +742,9 @@ static void tlmi_release_attr(void) kobject_put(&tlmi_priv.setting[i]->kobj); } } + sysfs_remove_file(&tlmi_priv.attribute_kset->kobj, &pending_reboot.attr); + if (tlmi_priv.can_debug_cmd && debug_support) + sysfs_remove_file(&tlmi_priv.attribute_kset->kobj, &debug_cmd.attr); kset_unregister(tlmi_priv.attribute_kset); /* Authentication structures */ @@ -709,8 +795,8 @@ static int tlmi_sysfs_init(void) /* Build attribute */ tlmi_priv.setting[i]->kobj.kset = tlmi_priv.attribute_kset; - ret = kobject_init_and_add(&tlmi_priv.setting[i]->kobj, &tlmi_attr_setting_ktype, - NULL, "%s", tlmi_priv.setting[i]->display_name); + ret = kobject_add(&tlmi_priv.setting[i]->kobj, NULL, + "%s", tlmi_priv.setting[i]->display_name); if (ret) goto fail_create_attr; @@ -719,6 +805,15 @@ static int tlmi_sysfs_init(void) goto fail_create_attr; } + ret = sysfs_create_file(&tlmi_priv.attribute_kset->kobj, &pending_reboot.attr); + if (ret) + goto fail_create_attr; + + if (tlmi_priv.can_debug_cmd && debug_support) { + ret = sysfs_create_file(&tlmi_priv.attribute_kset->kobj, &debug_cmd.attr); + if (ret) + goto fail_create_attr; + } /* Create authentication entries */ tlmi_priv.authentication_kset = kset_create_and_add("authentication", NULL, &tlmi_priv.class_dev->kobj); @@ -727,8 +822,7 @@ static int tlmi_sysfs_init(void) goto fail_create_attr; } tlmi_priv.pwd_admin->kobj.kset = tlmi_priv.authentication_kset; - ret = kobject_init_and_add(&tlmi_priv.pwd_admin->kobj, &tlmi_pwd_setting_ktype, - NULL, "%s", "Admin"); + ret = kobject_add(&tlmi_priv.pwd_admin->kobj, NULL, "%s", "Admin"); if (ret) goto fail_create_attr; @@ -737,8 +831,7 @@ static int tlmi_sysfs_init(void) goto fail_create_attr; tlmi_priv.pwd_power->kobj.kset = tlmi_priv.authentication_kset; - ret = kobject_init_and_add(&tlmi_priv.pwd_power->kobj, &tlmi_pwd_setting_ktype, - NULL, "%s", "System"); + ret = kobject_add(&tlmi_priv.pwd_power->kobj, NULL, "%s", "System"); if (ret) goto fail_create_attr; @@ -777,6 +870,9 @@ static int tlmi_analyze(void) if (wmi_has_guid(LENOVO_BIOS_PASSWORD_SETTINGS_GUID)) tlmi_priv.can_get_password_settings = true; + if (wmi_has_guid(LENOVO_DEBUG_CMD_GUID)) + tlmi_priv.can_debug_cmd = true; + /* * Try to find the number of valid settings of this machine * and use it to create sysfs attributes. @@ -818,6 +914,7 @@ static int tlmi_analyze(void) pr_info("Error retrieving possible values for %d : %s\n", i, setting->display_name); } + kobject_init(&setting->kobj, &tlmi_attr_setting_ktype); tlmi_priv.setting[i] = setting; tlmi_priv.settings_count++; kfree(item); @@ -844,10 +941,12 @@ static int tlmi_analyze(void) if (pwdcfg.password_state & TLMI_PAP_PWD) tlmi_priv.pwd_admin->valid = true; + kobject_init(&tlmi_priv.pwd_admin->kobj, &tlmi_pwd_setting_ktype); + tlmi_priv.pwd_power = kzalloc(sizeof(struct tlmi_pwd_setting), GFP_KERNEL); if (!tlmi_priv.pwd_power) { ret = -ENOMEM; - goto fail_clear_attr; + goto fail_free_pwd_admin; } strscpy(tlmi_priv.pwd_power->kbdlang, "us", TLMI_LANG_MAXLEN); tlmi_priv.pwd_power->encoding = TLMI_ENCODING_ASCII; @@ -859,11 +958,19 @@ static int tlmi_analyze(void) if (pwdcfg.password_state & TLMI_POP_PWD) tlmi_priv.pwd_power->valid = true; + kobject_init(&tlmi_priv.pwd_power->kobj, &tlmi_pwd_setting_ktype); + return 0; +fail_free_pwd_admin: + kfree(tlmi_priv.pwd_admin); fail_clear_attr: - for (i = 0; i < TLMI_SETTINGS_COUNT; ++i) - kfree(tlmi_priv.setting[i]); + for (i = 0; i < TLMI_SETTINGS_COUNT; ++i) { + if (tlmi_priv.setting[i]) { + kfree(tlmi_priv.setting[i]->possible_values); + kfree(tlmi_priv.setting[i]); + } + } return ret; } |