From patchwork Fri Nov 3 18:57:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Armin Wolf X-Patchwork-Id: 13444917 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8EA52C4332F for ; Fri, 3 Nov 2023 18:58:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346081AbjKCS6V (ORCPT ); Fri, 3 Nov 2023 14:58:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376681AbjKCS6S (ORCPT ); Fri, 3 Nov 2023 14:58:18 -0400 Received: from mout.gmx.net (mout.gmx.net [212.227.15.19]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7EF33D69; Fri, 3 Nov 2023 11:58:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.de; s=s31663417; t=1699037857; x=1699642657; i=w_armin@gmx.de; bh=abA6cd0ROFO4J9zU8gqjq2QNr351dN8dosUIAA7azF8=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:In-Reply-To: References; b=M7745ibwygmmfuTQ/hkpeFKNodU1fsiadL6W9S3gmRTHRGG9nIzmRxtFQXMLsicE +L7+FUbpD/lg0/Uk0V5sDn6DfGGNso7n3R01RCzSN3BAMAEu41wc5aRsCdZ6TkVhP +hE73vWhbk9NQebT4+B7/X3sC2ibTdNVAhCPlP1/8ZsUOQ81lXSsWhCi6B5Q7kTrU //7iwItw304mLOug8tuUpOQ+ktt9Zh6B3/WHiMVPpjFL0itKIdn9JTOXFc6vXAhxY 78Hi04FsXp15wXSbThdaJ+3hNAWFP/NvFBuqeZMpBBSv13zMszT9XGXfO9JkvQxG7 jechva8WR13bhf4zdw== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from mx-amd-b650.users.agdsn.de ([141.30.226.129]) by mail.gmx.net (mrgmx004 [212.227.17.190]) with ESMTPSA (Nemesis) id 1N8XTv-1rTdIH4BOL-014PlR; Fri, 03 Nov 2023 19:57:37 +0100 From: Armin Wolf To: pali@kernel.org Cc: jdelvare@suse.com, linux@roeck-us.net, linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 7/9] hwmon: (dell-smm) Add support for WMI SMM interface Date: Fri, 3 Nov 2023 19:57:14 +0100 Message-Id: <20231103185716.11007-8-W_Armin@gmx.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231103185716.11007-1-W_Armin@gmx.de> References: <20231103185716.11007-1-W_Armin@gmx.de> MIME-Version: 1.0 X-Provags-ID: V03:K1:QLUs7fSpPGa6yht+1yEeTo7UptI8AAyeBxyB5y70OH+oEsApvni lXWuktKSvcGSzr4ThEZeQJbrhP58lz/DpjFSez2LVJu2jmLWXeFGVS3pmRjIafG0pVk1V3e gvriwYWUdRRT+GXnDgWpAGxhCUeEbCni/4139Dt/4G/4u4DQpLRLRWWYkMWRnHlJ+2UZrxp 7eHYO4sDR1b7LDBLBNltQ== UI-OutboundReport: notjunk:1;M01:P0:lBIeKzykNcI=;p/TpR9cv/DUh9eMVFroaSH8T5yi S4eA9sQkpKAA5b7XErGFoBwMmwL4kRiTvJYLtcesW3AsZJsQXqBVI+4mIKQJkhfJIxIM/QmR3 RaEkAPKmAcgKGopKTB6ULhuVR6UG2KGlUHhYkYTD2EPGuBRI4uweTQ/eAFmfZrmS7g3ZWVXUu 8Dhw9Q5CqcnXmRo1fksTNsSqkwUIBaniFvG9wpL5c+2V7K5JDsnUaDz9xRQgsW2cpScMWZ6Ex +DH+BaZTf2Qsb9WqpQOpjSs6nxHM5xrLgJNmztfbmwhzJwlgQVwqncwpF7DaFH9rNVmgJoezp apjdpDY3C7ZbwTasDgnbckRXYHB+SC7GAu+z9BQhpd3W0uyQJT/SN5P2wcZqSAzVY3dvuAAwt RHMECBA7HXo3dca97GS1eKjA6U9WWUPOjCfKMv1N4bF+3fEmjBnz9HL15FrnMiWrTbgoEqPIj P0vMplyUrDlkPNEibKvsAmbhXDQVrFgH265DcoJiMh6NZfgYcJscWqWF6T+Pk28UNztxm9W5q TjMNEqVPSYZ/5pFC7hXbm5FWUWVWPaDJQdGtoRfsXI4coFWio7JQMC7qYmqchJU63RU+0waJ7 ab0YtUaczod2HY061fRi/i1g1SH8fpeP1AoPIDEi3F/Ret4CRRRCAviGBT538c3my1zA73foV O22zjtJ+dCc2T7peNn0nko560RdM/ir6PAS1E2dtL8FXvBDBhCw0T7LN/uwi/Lru74olp/gI/ MNrXjlTaCVHytNxKElf4OafXPp9MQJp3sW6il1tzcG4HIXsP0gFgF2ILrKyI5LRC4RPFNgsyZ AENjTvlDshIKKDHjqagJG6P4erTY1MXmJIDkQ+1Y+MVsHLbw3O9A09KunxlAyDBPocCzwHKlQ 752ngmAZmbFYGIILzrQbdwqag+M5kdfQC2rH1LGvws1gpAdXeN4qQp0eXFmnniIqQAbxCumHI ElnIM/w/LvzH1P1luD8JH/qxsVs= Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org Some Dell machines like the Dell Optiplex 7000 do not support the legacy SMM interface, but instead expect all SMM calls to be issued over a special WMI interface. Add support for this interface so users can control the fans on those machines. Tested-by: Signed-off-by: Armin Wolf --- drivers/hwmon/Kconfig | 1 + drivers/hwmon/dell-smm-hwmon.c | 164 +++++++++++++++++++++++++++++---- drivers/platform/x86/wmi.c | 1 + 3 files changed, 147 insertions(+), 19 deletions(-) -- 2.39.2 diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index cf27523eed5a..76cb05db1dcf 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -512,6 +512,7 @@ config SENSORS_DS1621 config SENSORS_DELL_SMM tristate "Dell laptop SMM BIOS hwmon driver" + depends on ACPI_WMI depends on X86 imply THERMAL help diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c index 2547b09929e6..36d41262d579 100644 --- a/drivers/hwmon/dell-smm-hwmon.c +++ b/drivers/hwmon/dell-smm-hwmon.c @@ -12,6 +12,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include #include #include #include @@ -34,8 +35,10 @@ #include #include #include +#include #include +#include #define I8K_SMM_FN_STATUS 0x0025 #define I8K_SMM_POWER_STATUS 0x0069 @@ -66,6 +69,8 @@ #define I8K_POWER_AC 0x05 #define I8K_POWER_BATTERY 0x01 +#define DELL_SMM_WMI_GUID "F1DDEE52-063C-4784-A11E-8A06684B9B01" + #define DELL_SMM_NO_TEMP 10 #define DELL_SMM_NO_FANS 3 @@ -219,6 +224,69 @@ static const struct dell_smm_ops i8k_smm_ops = { .smm_call = i8k_smm_call, }; +/* + * Call the System Management Mode BIOS over WMI. + */ +static int wmi_smm_call(struct device *dev, struct smm_regs *regs) +{ + struct wmi_device *wdev = container_of(dev, struct wmi_device, dev); + struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL }; + u32 wmi_payload[] = { + sizeof(regs->eax), + regs->eax, + sizeof(regs->ebx), + regs->ebx, + sizeof(regs->ecx), + regs->ecx, + sizeof(regs->edx), + regs->edx + }; + const struct acpi_buffer in = { + .length = sizeof(wmi_payload), + .pointer = &wmi_payload, + }; + union acpi_object *obj; + acpi_status status; + u32 *wmi_response; + int ret = 0; + int i; + + status = wmidev_evaluate_method(wdev, 0x0, 0x1, &in, &out); + if (ACPI_FAILURE(status)) + return -EIO; + + obj = out.pointer; + if (!obj) + return -ENODATA; + + if (obj->type != ACPI_TYPE_BUFFER && obj->buffer.length != sizeof(wmi_payload)) { + ret = -ENOMSG; + + goto err_free; + } + + wmi_response = (u32 *)obj->buffer.pointer; + + /* Check if register size is correct */ + for (i = 0; i < ARRAY_SIZE(wmi_payload); i += 2) { + if (get_unaligned_le32(&wmi_response[i]) != sizeof(wmi_response[i + 1])) { + ret = -ENOMSG; + + goto err_free; + } + } + + regs->eax = get_unaligned_le32(&wmi_response[1]); + regs->ebx = get_unaligned_le32(&wmi_response[3]); + regs->ecx = get_unaligned_le32(&wmi_response[5]); + regs->edx = get_unaligned_le32(&wmi_response[7]); + +err_free: + kfree(obj); + + return ret; +} + static int dell_smm_call(const struct dell_smm_ops *ops, struct smm_regs *regs) { int eax = regs->eax; @@ -306,7 +374,7 @@ static int i8k_get_fan_type(struct dell_smm_data *data, u8 fan) /* * Read the fan nominal rpm for specific fan speed. */ -static int __init i8k_get_fan_nominal_speed(const struct dell_smm_data *data, u8 fan, int speed) +static int i8k_get_fan_nominal_speed(const struct dell_smm_data *data, u8 fan, int speed) { struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, @@ -349,7 +417,7 @@ static int i8k_set_fan(const struct dell_smm_data *data, u8 fan, int speed) return dell_smm_call(data->ops, ®s); } -static int __init i8k_get_temp_type(const struct dell_smm_data *data, u8 sensor) +static int i8k_get_temp_type(const struct dell_smm_data *data, u8 sensor) { struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, @@ -401,7 +469,7 @@ static int i8k_get_temp(const struct dell_smm_data *data, u8 sensor) return temp; } -static int __init dell_smm_get_signature(const struct dell_smm_ops *ops, int req_fn) +static int dell_smm_get_signature(const struct dell_smm_ops *ops, int req_fn) { struct smm_regs regs = { .eax = req_fn, }; int rc; @@ -986,7 +1054,7 @@ static const struct hwmon_chip_info dell_smm_chip_info = { .info = dell_smm_info, }; -static int __init dell_smm_init_cdev(struct device *dev, u8 fan_num) +static int dell_smm_init_cdev(struct device *dev, u8 fan_num) { struct dell_smm_data *data = dev_get_drvdata(dev); struct thermal_cooling_device *cdev; @@ -1017,7 +1085,7 @@ static int __init dell_smm_init_cdev(struct device *dev, u8 fan_num) return ret; } -static int __init dell_smm_init_hwmon(struct device *dev) +static int dell_smm_init_hwmon(struct device *dev) { struct dell_smm_data *data = dev_get_drvdata(dev); struct device *dell_smm_hwmon_dev; @@ -1083,7 +1151,7 @@ static int __init dell_smm_init_hwmon(struct device *dev) return PTR_ERR_OR_ZERO(dell_smm_hwmon_dev); } -static int __init dell_smm_init_data(struct device *dev, const struct dell_smm_ops *ops) +static int dell_smm_init_data(struct device *dev, const struct dell_smm_ops *ops) { struct dell_smm_data *data; @@ -1409,6 +1477,9 @@ static const struct dmi_system_id i8k_whitelist_fan_control[] __initconst = { { } }; +/* + * Legacy SMM backend driver. + */ static int __init dell_smm_probe(struct platform_device *pdev) { int ret; @@ -1434,6 +1505,47 @@ static struct platform_driver dell_smm_driver = { static struct platform_device *dell_smm_device; +/* + * WMI SMM backend driver. + */ +static int dell_smm_wmi_probe(struct wmi_device *wdev, const void *context) +{ + struct dell_smm_ops *ops; + int ret; + + ops = devm_kzalloc(&wdev->dev, sizeof(*ops), GFP_KERNEL); + if (!ops) + return -ENOMEM; + + ops->smm_call = wmi_smm_call; + ops->smm_dev = &wdev->dev; + + if (dell_smm_get_signature(ops, I8K_SMM_GET_DELL_SIG1) && + dell_smm_get_signature(ops, I8K_SMM_GET_DELL_SIG2)) + return -ENODEV; + + ret = dell_smm_init_data(&wdev->dev, ops); + if (ret < 0) + return ret; + + return dell_smm_init_hwmon(&wdev->dev); +} + +static const struct wmi_device_id dell_smm_wmi_id_table[] = { + { DELL_SMM_WMI_GUID, NULL }, + { } +}; +MODULE_DEVICE_TABLE(wmi, dell_smm_wmi_id_table); + +static struct wmi_driver dell_smm_wmi_driver = { + .driver = { + .name = KBUILD_MODNAME, + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, + .id_table = dell_smm_wmi_id_table, + .probe = dell_smm_wmi_probe, +}; + /* * Probe for the presence of a supported laptop. */ @@ -1485,33 +1597,43 @@ static void __init dell_smm_init_dmi(void) } } -static int __init i8k_init(void) +static int __init dell_smm_legacy_check(void) { - /* - * Get DMI information - */ if (!dmi_check_system(i8k_dmi_table)) { if (!ignore_dmi && !force) return -ENODEV; - pr_info("not running on a supported Dell system.\n"); + pr_info("Probing for legacy SMM handler on unsupported machine\n"); pr_info("vendor=%s, model=%s, version=%s\n", i8k_get_dmi_data(DMI_SYS_VENDOR), i8k_get_dmi_data(DMI_PRODUCT_NAME), i8k_get_dmi_data(DMI_BIOS_VERSION)); } - dell_smm_init_dmi(); - - /* - * Get SMM Dell signature - */ if (dell_smm_get_signature(&i8k_smm_ops, I8K_SMM_GET_DELL_SIG1) && dell_smm_get_signature(&i8k_smm_ops, I8K_SMM_GET_DELL_SIG2)) { if (!force) return -ENODEV; - pr_err("Unable to get Dell SMM signature\n"); + pr_warn("Forcing legacy SMM calls on a possibly incompatible machine\n"); + } + + return 0; +} + +static int __init i8k_init(void) +{ + int ret; + + dell_smm_init_dmi(); + + ret = dell_smm_legacy_check(); + if (ret < 0) { + /* + * On modern machines, SMM communication happens over WMI, meaning + * the SMM handler might not react to legacy SMM calls. + */ + return wmi_driver_register(&dell_smm_wmi_driver); } dell_smm_device = platform_create_bundle(&dell_smm_driver, dell_smm_probe, NULL, 0, NULL, @@ -1522,8 +1644,12 @@ static int __init i8k_init(void) static void __exit i8k_exit(void) { - platform_device_unregister(dell_smm_device); - platform_driver_unregister(&dell_smm_driver); + if (dell_smm_device) { + platform_device_unregister(dell_smm_device); + platform_driver_unregister(&dell_smm_driver); + } else { + wmi_driver_unregister(&dell_smm_wmi_driver); + } } module_init(i8k_init); diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index a78ddd83cda0..0b3e63c21d26 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -106,6 +106,7 @@ MODULE_DEVICE_TABLE(acpi, wmi_device_ids); static const char * const allow_duplicates[] = { "05901221-D566-11D1-B2F0-00A0C9062910", /* wmi-bmof */ "8A42EA14-4F2A-FD45-6422-0087F7A7E608", /* dell-wmi-ddv */ + "F1DDEE52-063C-4784-A11E-8A06684B9B01", /* dell-smm-hwmon */ NULL };