From patchwork Wed Jul 3 11:05:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 809562 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0ACF9173328 for ; Wed, 3 Jul 2024 11:05:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720004743; cv=none; b=SMdVRpl7e7IU+3e3WahmR82rPYrwHLCV3mJopcOFTXkOAvzVK2+VDXoC7nt5XQKV4YwjpmmTr18WMLEVQW8h7rAxmjsdQAMavuRcDL/wxfd+D28I2qKBx+MCjp0SGSZrHOkpPCQpFeh5HIfY/tnsYGa2kNjP/DJUD5yadqWoPtQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720004743; c=relaxed/simple; bh=efEmJWiaWLXEySbthcLrBmZ7OFoTbsAv0GexXllP328=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Vh79xyhYfA+aA1facOhO1agfUa4Xzpm5LUw2bgNR6iHX9rHOJ1kcd8uWQR8V0KuaM5DYNJLb3l9Om3NzcwnD659HmIRL171Mv2v21jl1P9iv753SqzHMGYUzIl/pBHVN7blaEA0YRPOGOxw6GWY9DCB4uxUFB2cqOA6N1pABbL0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=MhrHHSMX; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="MhrHHSMX" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1720004741; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Z/RoJuACAYXdPvVIHs2RyA6Fqb36Bl8RlhlvG114vS0=; b=MhrHHSMXnnYhsddFpUgtM1/SpliBpBDmpF1/q6+YAaEMIvNJ5pZmTaPtvILNBsRVkyiIyQ rRMB0XtN6MLEdgBBE1lMkYYgNqz/8UfYKyQ4/kTLgWgtkWwlc/dm4FHeVhXXTcXd6Lv9sR U02A1EZK5/Ts++tePMSISwdJNDfUPq4= Received: from mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-607-5w3kCebNMiCIwouqxplfPg-1; Wed, 03 Jul 2024 07:05:36 -0400 X-MC-Unique: 5w3kCebNMiCIwouqxplfPg-1 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 2A0C619560AF; Wed, 3 Jul 2024 11:05:33 +0000 (UTC) Received: from localhost.localdomain (unknown [10.39.192.199]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 3700A1955BD2; Wed, 3 Jul 2024 11:05:28 +0000 (UTC) From: Hans de Goede To: =?utf-8?q?Pali_Roh=C3=A1r?= , =?utf-8?q?Ilpo_J=C3=A4rvi?= =?utf-8?q?nen?= , Andy Shevchenko , Paul Menzel , Wolfram Sang Cc: Hans de Goede , eric.piel@tremplin-utc.net, Marius Hoch , Dell.Client.Kernel@dell.com, Kai Heng Feng , platform-driver-x86@vger.kernel.org, Jean Delvare , Andi Shyti , linux-i2c@vger.kernel.org Subject: [PATCH v5 2/6] i2c: i801: Use a different adapter-name for IDF adapters Date: Wed, 3 Jul 2024 13:05:08 +0200 Message-ID: <20240703110512.21401-3-hdegoede@redhat.com> In-Reply-To: <20240703110512.21401-1-hdegoede@redhat.com> References: <20240703110512.21401-1-hdegoede@redhat.com> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 On chipsets with a second 'Integrated Device Function' SMBus controller use a different adapter-name for the second IDF adapter. This allows platform glue code which is looking for the primary i801 adapter to manually instantiate i2c_clients on to differentiate between the 2. This allows such code to find the primary i801 adapter by name, without needing to duplicate the PCI-ids to feature-flags mapping from i2c-i801.c. Reviewed-by: Pali Rohár Signed-off-by: Hans de Goede --- Changes in v4: - Use a single snprintf() with a conditional argument for the 2 names - Add a comment that the adapter-name is used by platform code Changes in v3: - This is a new patch in v3 of this patch-set --- drivers/i2c/busses/i2c-i801.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index d2d2a6dbe29f..94265ee300c0 100644 --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -1760,8 +1760,15 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id) i801_add_tco(priv); + /* + * adapter.name is used by platform code to find the main I801 adapter + * to instantiante i2c_clients, do not change. + */ snprintf(priv->adapter.name, sizeof(priv->adapter.name), - "SMBus I801 adapter at %04lx", priv->smba); + "SMBus %s adapter at %04lx", + (priv->features & FEATURE_IDF) ? "I801 IDF" : "I801", + priv->smba); + err = i2c_add_adapter(&priv->adapter); if (err) { platform_device_unregister(priv->tco_pdev); From patchwork Wed Jul 3 11:05:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 809561 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9FED217DE0E for ; Wed, 3 Jul 2024 11:05:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720004752; cv=none; b=nw9dtvOfICuDk0ztSMp8JRA6IghgP7cQjwa6F4VxGCDzbAE5NX0rvEq1GmTtBuu08VbCuEO/ZQcEtdpLlJ4T60b5dVZT/W8sYhbbvSZENF2WCvgQZ8/zA2SCnsKMZEi0eVJycblsV6rEsGAh+0vE+0B57m69XP36nMSWgyk9onA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720004752; c=relaxed/simple; bh=pDdJjYpfxmAa/u0CQaw1TAP3xjURItSYklFAnuCccws=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=DUA1bK+KJYtTUmBZsXHR8XmAN/14X+lzmgtpwy4y30EFKdX93/3yTHypSNJboSKey0AQV4nZ9LVdSpmmJAyJOAzlgZLARP7IP+ykopGwhG8SV7kQMLKgtsQoQOy8o7uSu27jmoKIU6O8r+VC7JYW073wOpy37VNYbPIppw/CYcU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=SBaUkS5x; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="SBaUkS5x" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1720004749; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KD6DTUHc0h0Twmvb4hrUj4vrMZ0YKaYI49kxkW8XEV8=; b=SBaUkS5xvVJMGnfK7Zy6LW9i3HimyLNEhNs2RuasV+CTEfRjfaQTaWIn0pRejr1D86z8Lz YX4He1OKZSMhGuJdwBSSkvmot1KFACEhTHWUEA4FCI576oJQje5Dw7QTEuYwIKf0b6TvRN OF2ihy2qmq8b7Yap7Ml403AoSEojyDg= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-45-M6EARgQ9MoS-JbXMF6AinA-1; Wed, 03 Jul 2024 07:05:44 -0400 X-MC-Unique: M6EARgQ9MoS-JbXMF6AinA-1 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 385511955BD0; Wed, 3 Jul 2024 11:05:42 +0000 (UTC) Received: from localhost.localdomain (unknown [10.39.192.199]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id A9A22195607C; Wed, 3 Jul 2024 11:05:38 +0000 (UTC) From: Hans de Goede To: =?utf-8?q?Pali_Roh=C3=A1r?= , =?utf-8?q?Ilpo_J=C3=A4rvi?= =?utf-8?q?nen?= , Andy Shevchenko , Paul Menzel , Wolfram Sang Cc: Hans de Goede , eric.piel@tremplin-utc.net, Marius Hoch , Dell.Client.Kernel@dell.com, Kai Heng Feng , platform-driver-x86@vger.kernel.org, Jean Delvare , Andi Shyti , linux-i2c@vger.kernel.org Subject: [PATCH v5 4/6] platform/x86: dell-smo8800: Move instantiation of lis3lv02d i2c_client from i2c-i801 to dell-lis3lv02d Date: Wed, 3 Jul 2024 13:05:10 +0200 Message-ID: <20240703110512.21401-5-hdegoede@redhat.com> In-Reply-To: <20240703110512.21401-1-hdegoede@redhat.com> References: <20240703110512.21401-1-hdegoede@redhat.com> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Various Dell laptops have an lis3lv02d freefall/accelerometer sensor. The lis3lv02d chip has an interrupt line as well as an I2C connection to the system's main SMBus. The lis3lv02d is described in the ACPI tables by an SMO88xx ACPI device, but the SMO88xx ACPI fwnodes are incomplete and only list an IRQ resource. So far this has been worked around with some SMO88xx specific quirk code in the generic i2c-i801 driver, but it is not necessary to handle the Dell specific instantiation of i2c_client-s for SMO88xx ACPI devices there. The kernel already instantiates platform_device-s for these with an acpi:SMO88xx modalias. The drivers/platform/x86/dell/dell-smo8800.c driver binds to this platform device but this only deals with the interrupt resource. Add a drivers/platform/x86/dell/dell-lis3lv02d.c which will matches on the same acpi:SMO88xx modaliases and move the i2c_client instantiation from the generic i2c-i801 driver there. Moving the i2c_client instantiation has the following advantages: 1. This moves the SMO88xx ACPI device quirk handling away from the generic i2c-i801 module which is loaded on all Intel x86 machines to a module which will only be loaded when there is an ACPI SMO88xx device. 2. This removes the duplication of the SMO88xx ACPI Hardware ID (HID) table between the i2c-i801 and dell-smo8800 drivers. 3. This allows extending the quirk handling by adding new code and related module parameters to the dell-lis3lv02d driver, without needing to modify the i2c-i801 code. Reviewed-by: Pali Rohár Signed-off-by: Hans de Goede --- Changes in v5: - Make match_acpi_device_ids() and match_acpi_device_ids[] __init[const] - Add "Depends on I2C" to Kconfig Changes in v4: - Move the i2c_client instantiation to a new dell-lis3lv02d driver instead of adding it to the dell-smo8800 driver Changes in v3: - Use an i2c bus notifier so that the i2c_client will still be instantiated if the i801 i2c_adapter shows up later or is re-probed (removed + added again) - Switch to standard dmi_system_id matching to check both sys-vendor + product-name DMI fields - Use unique i2c_adapter->name prefix for primary i2c_801 controller to avoid needing to duplicate PCI ids for extra IDF i2c_801 i2c_adapter-s - Drop MODULE_SOFTDEP("pre: i2c-i801"), this is now no longer necessary - Rebase on Torvalds master for recent additions of extra models in the dell_lis3lv02d_devices[] list Changes in v2: - Use a pci_device_id table to check for IDF (non main) i2c-i801 SMBusses - Add a comment documenting the IDF PCI device ids --- drivers/i2c/busses/i2c-i801.c | 124 ------------- drivers/platform/x86/dell/Kconfig | 1 + drivers/platform/x86/dell/Makefile | 1 + drivers/platform/x86/dell/dell-lis3lv02d.c | 202 +++++++++++++++++++++ 4 files changed, 204 insertions(+), 124 deletions(-) create mode 100644 drivers/platform/x86/dell/dell-lis3lv02d.c diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index 94265ee300c0..375781079e0d 100644 --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -1153,127 +1153,6 @@ static void dmi_check_onboard_devices(const struct dmi_header *dm, void *adap) } } -/* NOTE: Keep this list in sync with drivers/platform/x86/dell-smo8800.c */ -static const char *const acpi_smo8800_ids[] = { - "SMO8800", - "SMO8801", - "SMO8810", - "SMO8811", - "SMO8820", - "SMO8821", - "SMO8830", - "SMO8831", -}; - -static acpi_status check_acpi_smo88xx_device(acpi_handle obj_handle, - u32 nesting_level, - void *context, - void **return_value) -{ - struct acpi_device_info *info; - acpi_status status; - char *hid; - int i; - - status = acpi_get_object_info(obj_handle, &info); - if (ACPI_FAILURE(status)) - return AE_OK; - - if (!(info->valid & ACPI_VALID_HID)) - goto smo88xx_not_found; - - hid = info->hardware_id.string; - if (!hid) - goto smo88xx_not_found; - - i = match_string(acpi_smo8800_ids, ARRAY_SIZE(acpi_smo8800_ids), hid); - if (i < 0) - goto smo88xx_not_found; - - kfree(info); - - *return_value = NULL; - return AE_CTRL_TERMINATE; - -smo88xx_not_found: - kfree(info); - return AE_OK; -} - -static bool is_dell_system_with_lis3lv02d(void) -{ - void *err = ERR_PTR(-ENOENT); - - if (!dmi_match(DMI_SYS_VENDOR, "Dell Inc.")) - return false; - - /* - * Check that ACPI device SMO88xx is present and is functioning. - * Function acpi_get_devices() already filters all ACPI devices - * which are not present or are not functioning. - * ACPI device SMO88xx represents our ST microelectronics lis3lv02d - * accelerometer but unfortunately ACPI does not provide any other - * information (like I2C address). - */ - acpi_get_devices(NULL, check_acpi_smo88xx_device, NULL, &err); - - return !IS_ERR(err); -} - -/* - * Accelerometer's I2C address is not specified in DMI nor ACPI, - * so it is needed to define mapping table based on DMI product names. - */ -static const struct { - const char *dmi_product_name; - unsigned short i2c_addr; -} dell_lis3lv02d_devices[] = { - /* - * Dell platform team told us that these Latitude devices have - * ST microelectronics accelerometer at I2C address 0x29. - */ - { "Latitude E5250", 0x29 }, - { "Latitude E5450", 0x29 }, - { "Latitude E5550", 0x29 }, - { "Latitude E6440", 0x29 }, - { "Latitude E6440 ATG", 0x29 }, - { "Latitude E6540", 0x29 }, - /* - * Additional individual entries were added after verification. - */ - { "Latitude 5480", 0x29 }, - { "Precision 3540", 0x29 }, - { "Vostro V131", 0x1d }, - { "Vostro 5568", 0x29 }, - { "XPS 15 7590", 0x29 }, -}; - -static void register_dell_lis3lv02d_i2c_device(struct i801_priv *priv) -{ - struct i2c_board_info info; - const char *dmi_product_name; - int i; - - dmi_product_name = dmi_get_system_info(DMI_PRODUCT_NAME); - for (i = 0; i < ARRAY_SIZE(dell_lis3lv02d_devices); ++i) { - if (strcmp(dmi_product_name, - dell_lis3lv02d_devices[i].dmi_product_name) == 0) - break; - } - - if (i == ARRAY_SIZE(dell_lis3lv02d_devices)) { - dev_warn(&priv->pci_dev->dev, - "Accelerometer lis3lv02d is present on SMBus but its" - " address is unknown, skipping registration\n"); - return; - } - - memset(&info, 0, sizeof(struct i2c_board_info)); - info.addr = dell_lis3lv02d_devices[i].i2c_addr; - strscpy(info.type, "lis3lv02d", I2C_NAME_SIZE); - i2c_new_client_device(&priv->adapter, &info); -} - /* Register optional slaves */ static void i801_probe_optional_slaves(struct i801_priv *priv) { @@ -1293,9 +1172,6 @@ static void i801_probe_optional_slaves(struct i801_priv *priv) if (dmi_name_in_vendors("FUJITSU")) dmi_walk(dmi_check_onboard_devices, &priv->adapter); - if (is_dell_system_with_lis3lv02d()) - register_dell_lis3lv02d_i2c_device(priv); - /* Instantiate SPD EEPROMs unless the SMBus is multiplexed */ #ifdef CONFIG_I2C_I801_MUX if (!priv->mux_pdev) diff --git a/drivers/platform/x86/dell/Kconfig b/drivers/platform/x86/dell/Kconfig index 195a8bf532cc..2fbaf08a2e79 100644 --- a/drivers/platform/x86/dell/Kconfig +++ b/drivers/platform/x86/dell/Kconfig @@ -137,6 +137,7 @@ config DELL_SMBIOS_SMM config DELL_SMO8800 tristate "Dell Latitude freefall driver (ACPI SMO88XX)" default m + depends on I2C depends on ACPI || COMPILE_TEST help Say Y here if you want to support SMO88XX freefall devices diff --git a/drivers/platform/x86/dell/Makefile b/drivers/platform/x86/dell/Makefile index 8176a257d9c3..970409c107b0 100644 --- a/drivers/platform/x86/dell/Makefile +++ b/drivers/platform/x86/dell/Makefile @@ -14,6 +14,7 @@ dell-smbios-objs := dell-smbios-base.o dell-smbios-$(CONFIG_DELL_SMBIOS_WMI) += dell-smbios-wmi.o dell-smbios-$(CONFIG_DELL_SMBIOS_SMM) += dell-smbios-smm.o obj-$(CONFIG_DELL_SMO8800) += dell-smo8800.o +obj-$(CONFIG_DELL_SMO8800) += dell-lis3lv02d.o obj-$(CONFIG_DELL_UART_BACKLIGHT) += dell-uart-backlight.o obj-$(CONFIG_DELL_WMI) += dell-wmi.o dell-wmi-objs := dell-wmi-base.o diff --git a/drivers/platform/x86/dell/dell-lis3lv02d.c b/drivers/platform/x86/dell/dell-lis3lv02d.c new file mode 100644 index 000000000000..c74f0825d252 --- /dev/null +++ b/drivers/platform/x86/dell/dell-lis3lv02d.c @@ -0,0 +1,202 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * lis3lv02d i2c-client instantiation for ACPI SMO88xx devices without I2C resources. + * + * Copyright (C) 2024 Hans de Goede + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include "dell-smo8800-ids.h" + +#define DELL_LIS3LV02D_DMI_ENTRY(product_name, i2c_addr) \ + { \ + .matches = { \ + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), \ + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, product_name), \ + }, \ + .driver_data = (void *)(uintptr_t)(i2c_addr), \ + } + +/* + * Accelerometer's I2C address is not specified in DMI nor ACPI, + * so it is needed to define mapping table based on DMI product names. + */ +static const struct dmi_system_id lis3lv02d_devices[] __initconst = { + /* + * Dell platform team told us that these Latitude devices have + * ST microelectronics accelerometer at I2C address 0x29. + */ + DELL_LIS3LV02D_DMI_ENTRY("Latitude E5250", 0x29), + DELL_LIS3LV02D_DMI_ENTRY("Latitude E5450", 0x29), + DELL_LIS3LV02D_DMI_ENTRY("Latitude E5550", 0x29), + DELL_LIS3LV02D_DMI_ENTRY("Latitude E6440", 0x29), + DELL_LIS3LV02D_DMI_ENTRY("Latitude E6440 ATG", 0x29), + DELL_LIS3LV02D_DMI_ENTRY("Latitude E6540", 0x29), + /* + * Additional individual entries were added after verification. + */ + DELL_LIS3LV02D_DMI_ENTRY("Latitude 5480", 0x29), + DELL_LIS3LV02D_DMI_ENTRY("Precision 3540", 0x29), + DELL_LIS3LV02D_DMI_ENTRY("Vostro V131", 0x1d), + DELL_LIS3LV02D_DMI_ENTRY("Vostro 5568", 0x29), + DELL_LIS3LV02D_DMI_ENTRY("XPS 15 7590", 0x29), + { } +}; + +static u8 i2c_addr; +static struct i2c_client *i2c_dev; +static bool notifier_registered; + +static bool i2c_adapter_is_main_i801(struct i2c_adapter *adap) +{ + /* + * Only match the main I801 adapter and reject secondary adapters + * which names start with "SMBus I801 IDF adapter". + */ + return strstarts(adap->name, "SMBus I801 adapter"); +} + +static int find_i801(struct device *dev, void *data) +{ + struct i2c_adapter *adap, **adap_ret = data; + + adap = i2c_verify_adapter(dev); + if (!adap) + return 0; + + if (!i2c_adapter_is_main_i801(adap)) + return 0; + + *adap_ret = i2c_get_adapter(adap->nr); + return 1; +} + +static void instantiate_i2c_client(struct work_struct *work) +{ + struct i2c_board_info info = { }; + struct i2c_adapter *adap = NULL; + + if (i2c_dev) + return; + + bus_for_each_dev(&i2c_bus_type, NULL, &adap, find_i801); + if (!adap) + return; + + info.addr = i2c_addr; + strscpy(info.type, "lis3lv02d", I2C_NAME_SIZE); + + i2c_dev = i2c_new_client_device(adap, &info); + if (IS_ERR(i2c_dev)) { + pr_err("error %ld registering i2c_client\n", PTR_ERR(i2c_dev)); + i2c_dev = NULL; + } else { + pr_debug("registered lis3lv02d on address 0x%02x\n", info.addr); + } + + i2c_put_adapter(adap); +} +static DECLARE_WORK(i2c_work, instantiate_i2c_client); + +static int i2c_bus_notify(struct notifier_block *nb, unsigned long action, void *data) +{ + struct device *dev = data; + struct i2c_client *client; + struct i2c_adapter *adap; + + switch (action) { + case BUS_NOTIFY_ADD_DEVICE: + adap = i2c_verify_adapter(dev); + if (!adap) + break; + + if (i2c_adapter_is_main_i801(adap)) + queue_work(system_long_wq, &i2c_work); + break; + case BUS_NOTIFY_REMOVED_DEVICE: + client = i2c_verify_client(dev); + if (!client) + break; + + if (i2c_dev == client) { + pr_debug("lis3lv02d i2c_client removed\n"); + i2c_dev = NULL; + } + break; + default: + break; + } + + return 0; +} +static struct notifier_block i2c_nb = { .notifier_call = i2c_bus_notify }; + +static int __init match_acpi_device_ids(struct device *dev, const void *data) +{ + const struct acpi_device_id *ids = data; + + return acpi_match_device(ids, dev) ? 1 : 0; +} + +static int __init dell_lis3lv02d_init(void) +{ + const struct dmi_system_id *lis3lv02d_dmi_id; + struct device *dev; + int err; + + /* + * First check for a matching platform_device. This protects against + * SMO88xx ACPI fwnodes which actually do have an I2C resource, which + * will already have an i2c_client instantiated (not a platform_device). + */ + dev = bus_find_device(&platform_bus_type, NULL, smo8800_ids, match_acpi_device_ids); + if (!dev) { + pr_debug("No SMO88xx platform-device found\n"); + return 0; + } + put_device(dev); + + lis3lv02d_dmi_id = dmi_first_match(lis3lv02d_devices); + if (!lis3lv02d_dmi_id) { + pr_warn("accelerometer is present on SMBus but its address is unknown, skipping registration\n"); + return 0; + } + + i2c_addr = (long)lis3lv02d_dmi_id->driver_data; + + /* + * Register i2c-bus notifier + queue initial scan for lis3lv02d + * i2c_client instantiation. + */ + err = bus_register_notifier(&i2c_bus_type, &i2c_nb); + if (err) + return err; + + notifier_registered = true; + + queue_work(system_long_wq, &i2c_work); + return 0; +} +module_init(dell_lis3lv02d_init); + +static void __exit dell_lis3lv02d_module_exit(void) +{ + if (!notifier_registered) + return; + + bus_unregister_notifier(&i2c_bus_type, &i2c_nb); + cancel_work_sync(&i2c_work); + i2c_unregister_device(i2c_dev); +} +module_exit(dell_lis3lv02d_module_exit); + +MODULE_DESCRIPTION("lis3lv02d i2c-client instantiation for ACPI SMO88xx devices"); +MODULE_AUTHOR("Hans de Goede "); +MODULE_LICENSE("GPL"); From patchwork Wed Jul 3 11:05:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 809560 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 25FF217E907 for ; Wed, 3 Jul 2024 11:05:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720004760; cv=none; b=pkLGKLmu/iohCRSfCjBZfE+RDe6+FZLkUYRaNo/783IUlNuvmI2iuScw6Sbrs/X7dN5U4cdnWR6fW3HagH+bIgJ/M8iPI84pK9UZsekIp9k67cxD+O+Kicc7C8QcSSj6706mgWDMr61RT/WrPn64jmkYNRiARPB0LaOB8Ji8IwE= ARC-Message-Signature: i=1; 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Wed, 3 Jul 2024 11:05:51 +0000 (UTC) Received: from localhost.localdomain (unknown [10.39.192.199]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 38C53195607C; Wed, 3 Jul 2024 11:05:47 +0000 (UTC) From: Hans de Goede To: =?utf-8?q?Pali_Roh=C3=A1r?= , =?utf-8?q?Ilpo_J=C3=A4rvi?= =?utf-8?q?nen?= , Andy Shevchenko , Paul Menzel , Wolfram Sang Cc: Hans de Goede , eric.piel@tremplin-utc.net, Marius Hoch , Dell.Client.Kernel@dell.com, Kai Heng Feng , platform-driver-x86@vger.kernel.org, Jean Delvare , Andi Shyti , linux-i2c@vger.kernel.org Subject: [PATCH v5 6/6] platform/x86: dell-smo8800: Add support for probing for the accelerometer i2c address Date: Wed, 3 Jul 2024 13:05:12 +0200 Message-ID: <20240703110512.21401-7-hdegoede@redhat.com> In-Reply-To: <20240703110512.21401-1-hdegoede@redhat.com> References: <20240703110512.21401-1-hdegoede@redhat.com> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Unfortunately the SMOxxxx ACPI device does not contain the i2c-address of the accelerometer. So a DMI product-name to address mapping table is used. At support to have the kernel probe for the i2c-address for modesl which are not on the list. The new probing code sits behind a new probe_i2c_addr module parameter, which is disabled by default because probing might be dangerous. Link: https://lore.kernel.org/linux-i2c/4820e280-9ca4-4d97-9d21-059626161bfc@molgen.mpg.de/ Signed-off-by: Hans de Goede --- drivers/platform/x86/dell/dell-lis3lv02d.c | 136 ++++++++++++++++++++- 1 file changed, 133 insertions(+), 3 deletions(-) diff --git a/drivers/platform/x86/dell/dell-lis3lv02d.c b/drivers/platform/x86/dell/dell-lis3lv02d.c index ab02ad93758a..5e4b24ec02f1 100644 --- a/drivers/platform/x86/dell/dell-lis3lv02d.c +++ b/drivers/platform/x86/dell/dell-lis3lv02d.c @@ -15,6 +15,8 @@ #include #include "dell-smo8800-ids.h" +#define LIS3_WHO_AM_I 0x0f + #define DELL_LIS3LV02D_DMI_ENTRY(product_name, i2c_addr) \ { \ .matches = { \ @@ -57,6 +59,121 @@ static u8 i2c_addr; static struct i2c_client *i2c_dev; static bool notifier_registered; +static bool probe_i2c_addr; +module_param(probe_i2c_addr, bool, 0444); +MODULE_PARM_DESC(probe_i2c_addr, "Probe the i801 I2C bus for the accelerometer on models where the address is unknown, this may be dangerous."); + +/* + * This is the kernel version of the single register device sanity checks from + * the i2c_safety_check function from lm_sensors sensor-detect script: + * This is meant to prevent access to 1-register-only devices, + * which are designed to be accessed with SMBus receive byte and SMBus send + * byte transactions (i.e. short reads and short writes) and treat SMBus + * read byte as a real write followed by a read. The device detection + * routines would write random values to the chip with possibly very nasty + * results for the hardware. Note that this function won't catch all such + * chips, as it assumes that reads and writes relate to the same register, + * but that's the best we can do. + */ +static int i2c_safety_check(struct i2c_adapter *adap, u8 addr) +{ + union i2c_smbus_data smbus_data; + int err; + u8 data; + + /* + * First receive a byte from the chip, and remember it. This + * also checks if there is a device at the address at all. + */ + err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, 0, + I2C_SMBUS_BYTE, &smbus_data); + if (err < 0) + return err; + + data = smbus_data.byte; + + /* + * Receive a byte again; very likely to be the same for + * 1-register-only devices. + */ + err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, 0, + I2C_SMBUS_BYTE, &smbus_data); + if (err < 0) + return err; + + if (smbus_data.byte != data) + return 0; /* Not a 1-register-only device. */ + + /* + * Then try a standard byte read, with a register offset equal to + * the read byte; for 1-register-only device this should read + * the same byte value in return. + */ + err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, data, + I2C_SMBUS_BYTE_DATA, &smbus_data); + if (err < 0) + return err; + + if (smbus_data.byte != data) + return 0; /* Not a 1-register-only device. */ + + /* + * Then try a standard byte read, with a slightly different register + * offset; this should again read the register offset in return. + */ + err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, data ^ 0x01, + I2C_SMBUS_BYTE_DATA, &smbus_data); + if (err < 0) + return err; + + if (smbus_data.byte != (data ^ 0x01)) + return 0; /* Not a 1-register-only device. */ + + /* + * Apparently this is a 1-register-only device, restore the original + * register value and leave it alone. + */ + i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_WRITE, data, + I2C_SMBUS_BYTE, NULL); + pr_warn("I2C safety check for address 0x%02x failed, skipping\n", addr); + return -ENODEV; +} + +static int detect_lis3lv02d(struct i2c_adapter *adap, u8 addr, + struct i2c_board_info *info) +{ + union i2c_smbus_data smbus_data; + int err; + + pr_info("Probing for lis3lv02d on address 0x%02x\n", addr); + err = i2c_safety_check(adap, addr); + if (err < 0) + return err; + + err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, LIS3_WHO_AM_I, + I2C_SMBUS_BYTE_DATA, &smbus_data); + if (err < 0) { + pr_warn("Failed to read who-am-i register: %d\n", err); + return err; + } + + /* valid who-am-i values are from drivers/misc/lis3lv02d/lis3lv02d.c */ + switch (smbus_data.byte) { + case 0x32: + case 0x33: + case 0x3a: + case 0x3b: + break; + default: + pr_warn("Unknown who-am-i register value 0x%02x\n", smbus_data.byte); + return -ENODEV; + } + + pr_debug("Detected lis3lv02d on address 0x%02x\n", addr); + info->addr = addr; + return 0; +} + static bool i2c_adapter_is_main_i801(struct i2c_adapter *adap) { /* @@ -93,7 +210,17 @@ static void instantiate_i2c_client(struct work_struct *work) if (!adap) return; - info.addr = i2c_addr; + if (i2c_addr) { + info.addr = i2c_addr; + } else { + /* First try address 0x29 (most used) and then try 0x1d */ + if (detect_lis3lv02d(adap, 0x29, &info) != 0 && + detect_lis3lv02d(adap, 0x1d, &info) != 0) { + pr_warn("failed to probe for lis3lv02d I2C address\n"); + goto out_put_adapter; + } + } + strscpy(info.type, "lis3lv02d", I2C_NAME_SIZE); i2c_dev = i2c_new_client_device(adap, &info); @@ -104,6 +231,7 @@ static void instantiate_i2c_client(struct work_struct *work) pr_debug("registered lis3lv02d on address 0x%02x\n", info.addr); } +out_put_adapter: i2c_put_adapter(adap); } static DECLARE_WORK(i2c_work, instantiate_i2c_client); @@ -167,12 +295,14 @@ static int __init dell_lis3lv02d_init(void) put_device(dev); lis3lv02d_dmi_id = dmi_first_match(lis3lv02d_devices); - if (!lis3lv02d_dmi_id) { + if (!lis3lv02d_dmi_id && !probe_i2c_addr) { pr_warn("accelerometer is present on SMBus but its address is unknown, skipping registration\n"); + pr_info("Pass dell_lis3lv02d.probe_i2c_addr=1 on the kernel commandline to probe, this may be dangerous!\n"); return 0; } - i2c_addr = (long)lis3lv02d_dmi_id->driver_data; + if (lis3lv02d_dmi_id) + i2c_addr = (long)lis3lv02d_dmi_id->driver_data; /* * Register i2c-bus notifier + queue initial scan for lis3lv02d