From patchwork Sat Jan 6 16:09:31 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: 760576 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 267018493 for ; Sat, 6 Jan 2024 16:09:57 +0000 (UTC) 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="fRfAtf/g" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1704557397; 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=ETQlQ24aGFnl8f397NMf2mlyswZ/lAOe6fYIvSLYAII=; b=fRfAtf/gLjuJuVgSlLYhj8vA8eVXpzNmIFap4zv55kzrzOhb1BEbKIhz6YhOBNT9ifiZKq b0iaSGFUa23m92eFrTZEGwK5Ogf5rnQ4MPBvrrut6H0kRNowzWryHS75d/AsCvd+mKL885 pLZjZGvWL1y68wxeck5xfo5mzZ44luI= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-37-0YOWuQWNMJ2YEbkqRxbEhA-1; Sat, 06 Jan 2024 11:09:51 -0500 X-MC-Unique: 0YOWuQWNMJ2YEbkqRxbEhA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (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 mimecast-mx02.redhat.com (Postfix) with ESMTPS id 349343C025B9; Sat, 6 Jan 2024 16:09:51 +0000 (UTC) Received: from localhost.localdomain (unknown [10.39.192.13]) by smtp.corp.redhat.com (Postfix) with ESMTP id 76CAB3C27; Sat, 6 Jan 2024 16:09:49 +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 , Jean Delvare , Andi Shyti 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, Wolfram Sang , linux-i2c@vger.kernel.org Subject: [PATCH v2 4/6] platform/x86: dell-smo8800: Allow using the IIO st_accel driver Date: Sat, 6 Jan 2024 17:09:31 +0100 Message-ID: <20240106160935.45487-5-hdegoede@redhat.com> In-Reply-To: <20240106160935.45487-1-hdegoede@redhat.com> References: <20240106160935.45487-1-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 10.11.54.1 Allow using the IIO st_accel driver so that the accelerometer gets presented to userspace as an IIO device like all modern accelerometer drivers do. Note the default is still to use the drivers/misc/lis3lv02d/lis3lv02d.c /dev/freefall + evdev joystick emulation driver, so as to not break existing userspace consumers. /dev/freefall is used by the tools/laptop/freefall/freefall.c tool which is shipped by the kernel as well as by the linux-thinkpad hdapsd daemon. Using the IIO st_accel driver can be enabled by setting the new use_iio_driver module parameter. Link: https://github.com/linux-thinkpad/hdapsd/ Signed-off-by: Hans de Goede --- Changes in v2: - Keep using drivers/misc/lis3lv02d/lis3lv02d.c be default - Rename the module-parameter to use_iio_driver which can be set to use the IIO st_accel driver instead --- drivers/platform/x86/dell/dell-smo8800.c | 83 ++++++++++++++++++++++-- 1 file changed, 79 insertions(+), 4 deletions(-) diff --git a/drivers/platform/x86/dell/dell-smo8800.c b/drivers/platform/x86/dell/dell-smo8800.c index 3e64ebcf4b21..58bb7275ba5c 100644 --- a/drivers/platform/x86/dell/dell-smo8800.c +++ b/drivers/platform/x86/dell/dell-smo8800.c @@ -10,6 +10,7 @@ */ #define DRIVER_NAME "smo8800" +#define LIS3_WHO_AM_I 0x0f #include #include @@ -24,6 +25,10 @@ #include #include +static bool use_iio_driver; +module_param(use_iio_driver, bool, 0444); +MODULE_PARM_DESC(use_iio_driver, "Use IIO accelerometer driver instead of /dev/freefall chardev + evdev joystick emulation"); + struct smo8800_device { u32 irq; /* acpi device irq */ atomic_t counter; /* count after last read */ @@ -145,6 +150,65 @@ static int smo8800_find_i801(struct device *dev, void *data) return 1; } +/* + * Set label to let iio-sensor-proxy know these freefall sensors are located in + * the laptop base (not the display) and are not intended for screen rotation. + */ +static const struct property_entry smo8800_accel_props[] = { + PROPERTY_ENTRY_STRING("label", "accel-base"), + {} +}; + +const struct software_node smo8800_accel_node = { + .properties = smo8800_accel_props, +}; + +static int smo8800_detect_accel(struct smo8800_device *smo8800, + struct i2c_adapter *adap, u8 addr, + struct i2c_board_info *info) +{ + union i2c_smbus_data smbus_data; + const char *type; + int err; + + err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, LIS3_WHO_AM_I, + I2C_SMBUS_BYTE_DATA, &smbus_data); + if (err < 0) { + dev_warn(smo8800->dev, "Failed to read who-am-i register: %d\n", err); + return err; + } + + /* + * These who-am-i register mappings to model strings have been + * taken from the old /dev/freefall chardev and joystick driver: + * drivers/misc/lis3lv02d/lis3lv02d.c + */ + switch (smbus_data.byte) { + case 0x32: + type = "lis331dlh"; + break; + case 0x33: + type = "lis2de12"; /* LIS3DC / HP3DC in drivers/misc/lis3lv02d/lis3lv02d.c */ + break; + case 0x3a: + type = "lis3lv02dl_accel"; + break; + case 0x3b: + type = "lis302dl"; + break; + default: + dev_warn(smo8800->dev, "Unknown who-am-i register value 0x%02x\n", + smbus_data.byte); + return -ENODEV; + } + + strscpy(info->type, type, I2C_NAME_SIZE); + info->addr = addr; + info->irq = smo8800->irq; + info->swnode = &smo8800_accel_node; + return 0; +} + /* * Accelerometer's I2C address is not specified in DMI nor ACPI, * so it is needed to define mapping table based on DMI product names. @@ -177,7 +241,7 @@ static void smo8800_instantiate_i2c_client(struct smo8800_device *smo8800) struct i2c_adapter *adap = NULL; const char *dmi_product_name; u8 addr = 0; - int i; + int i, err; bus_for_each_dev(&i2c_bus_type, NULL, &adap, smo8800_find_i801); if (!adap) @@ -198,9 +262,20 @@ static void smo8800_instantiate_i2c_client(struct smo8800_device *smo8800) goto put_adapter; } - info.addr = addr; - info.irq = smo8800->irq; - strscpy(info.type, "lis3lv02d", I2C_NAME_SIZE); + /* Always detect the accel-type, this also checks the accel is actually there */ + err = smo8800_detect_accel(smo8800, adap, addr, &info); + if (err) + goto put_adapter; + + /* + * Unless using the IIO driver is requested, override the detected type + * with "lis3lv02d" so that drivers/misc/lis3lv02d/lis3lv02d.c is used + * and /dev/freefall functionality is provided. + */ + if (!use_iio_driver) { + strscpy(info.type, "lis3lv02d", I2C_NAME_SIZE); + info.swnode = NULL; + } smo8800->i2c_dev = i2c_new_client_device(adap, &info); if (IS_ERR(smo8800->i2c_dev)) {