From patchwork Mon Aug 5 13:37:08 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: 816861 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 D37D8364AE for ; Mon, 5 Aug 2024 13:38:58 +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=1722865140; cv=none; b=QGLP5n8xx9Gk6KKZRW1xOF3yEeM1Q8t1mCesnstcg5aiqdWWNPOAm1nCT01uZNhy0hiLSqQhBNjFc5rtFAqtqh9/ilXGLeF/tNzFawfkV3YapYdyfYQh8J6Gx9Cju/BCvUXKP+PyTKV4/PNExR3LlWtwmYNgE5nDiCFn1lhwxCk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722865140; c=relaxed/simple; bh=jGR8kBkPPQ7J/+W1K8e2CgUZiCz0N9ydw8bbGIB+Z0Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CUivM6dapCPgqHfAMYYkfNDvIGvMCsvJDI1zLhPStnbWmPVFJ888WSVz7uQCYeb3tyqimPeSqFLOGCyORwVVjRVUMhHuCgHd99h4g5QJH530Bj0HwxMa2t68NhNzFVMAjjq2adi0e9eMwDoDsod5U/yUITffJP72XGOhHHCxmJk= 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=fcJ84mj7; arc=none smtp.client-ip=170.10.133.124 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="fcJ84mj7" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1722865138; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=RIE1Tdqjj+u6sTzRWwSTUv019AwQqHsQmCFM7783DuE=; b=fcJ84mj78ncAyMQhUhy643Osoh8TO6L+Nuv3vtx2hXepCDaAI31V/8I/Na6ht6h4dqmTHE CCAyl/WwgohjkJ8OamepWGwl2B9cI55GStdGnNPYsiuQV1ZkoqY55u/TJqCQLN1/ZVCE/2 9Hsc4guWthIDM5yazr5g14FaxhuNGO8= 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-208-7x4l2pVVPsmPeGNM8JBTRA-1; Mon, 05 Aug 2024 09:38:54 -0400 X-MC-Unique: 7x4l2pVVPsmPeGNM8JBTRA-1 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (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 A7EC71955D4E; Mon, 5 Aug 2024 13:38:51 +0000 (UTC) Received: from x1.localdomain.com (unknown [10.39.193.139]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 47E7130001A9; Mon, 5 Aug 2024 13:38:40 +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 v7 6/6] platform/x86: dell-smo8800: Add support for probing for the accelerometer i2c address Date: Mon, 5 Aug 2024 15:37:08 +0200 Message-ID: <20240805133708.160737-7-hdegoede@redhat.com> In-Reply-To: <20240805133708.160737-1-hdegoede@redhat.com> References: <20240805133708.160737-1-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 3.4.1 on 10.30.177.4 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 --- Changes in v6: - Use i2c_new_scanned_device() instead of re-inventing it Changes in v5: - Add "this may be dangerous warning" to MODULE_PARM_DESC(probe_i2c_addr) --- drivers/platform/x86/dell/dell-lis3lv02d.c | 52 ++++++++++++++++++++-- 1 file changed, 48 insertions(+), 4 deletions(-) diff --git a/drivers/platform/x86/dell/dell-lis3lv02d.c b/drivers/platform/x86/dell/dell-lis3lv02d.c index ab02ad93758a..21390e6302a0 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 +59,38 @@ 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."); + +static int detect_lis3lv02d(struct i2c_adapter *adap, unsigned short addr) +{ + union i2c_smbus_data smbus_data; + int err; + + pr_info("Probing for lis3lv02d on address 0x%02x\n", addr); + + err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, LIS3_WHO_AM_I, + I2C_SMBUS_BYTE_DATA, &smbus_data); + if (err < 0) + return 0; /* Not found */ + + /* 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 0; /* Not found */ + } + + pr_debug("Detected lis3lv02d on address 0x%02x\n", addr); + return 1; /* Found */ +} + static bool i2c_adapter_is_main_i801(struct i2c_adapter *adap) { /* @@ -93,10 +127,18 @@ static void instantiate_i2c_client(struct work_struct *work) if (!adap) return; - info.addr = i2c_addr; strscpy(info.type, "lis3lv02d", I2C_NAME_SIZE); - i2c_dev = i2c_new_client_device(adap, &info); + if (i2c_addr) { + info.addr = i2c_addr; + i2c_dev = i2c_new_client_device(adap, &info); + } else { + /* First try address 0x29 (most used) and then try 0x1d */ + static const unsigned short addr_list[] = { 0x29, 0x1d, I2C_CLIENT_END }; + + i2c_dev = i2c_new_scanned_device(adap, &info, addr_list, detect_lis3lv02d); + } + if (IS_ERR(i2c_dev)) { pr_err("error %ld registering i2c_client\n", PTR_ERR(i2c_dev)); i2c_dev = NULL; @@ -167,12 +209,14 @@ 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