From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=74.125.82.170 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793264300; b=ivYMH/IYxxg1+kUdjK+K7WTayc6VgU9GfwhH1+XkwsjBFSLWYljKDrEHCx1TYlhEy3I0 CpxLOeaLXklvIadtgHlWIdETSJxffLHZ7aPzReJiXJqP40H0zJsD2BlVXKkvqbu/WAXF8 lAP0/DfZBPiJhDujUOHOZZlxETCsgxyndohxZprNp6ETCv/jApVYnT/Lw4zl+265k50+c nsB1cLRKJNZEcE+DgHcHnz3M1zIXsUAX8wbIiBGTwKwQXIrba/Xdyp7/rxA3H7I+gbkKn wF09QXLazdyeyYF8BpPc8jGp+j2N52AndRhq17qlEKPno5JNfLeTvB9oce7amS2yKlA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793264300; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Forwarded-Encrypted:X-Gm-Message-State:X-Gm-Gg:X-Received:Received: From:To:Cc:Subject:Date:Message-ID:X-Mailer:In-Reply-To:References: MIME-Version:Content-Transfer-Encoding; bh=aLiKz2BhC5RSo/yb+qOUrvZd9mNsTY8Su064dE1oXf0=; b=0eeUy3mNqUReHz+PDZIFUN1epMeUbHC7aAOGSoYzsKBOGMD3rd0H4027usB09AZGSUJH CAU64YVqMM3NQMkEVeEokWPN1tIwI+HJPhWxEaOcwnS15BPvN6E/XQkB+k6xSSvlMFWFd KwblEY1upOEZYdC3mxHc3jYbhdeKnoNFIca1AiQ/H1Chd5RLvdTh3QVAWbNJoutXQGkNi b/PcXpUBOuMJ3nJ8lSqDo63msH4QRQ/9mXVE3y8aP9VmyG/qLYGh4yM0IvIkhtcRy0S52 Mg46wHSkigeUvLiOQw9QTwAjnpMvA+Jlc+DOoYgPJn/3ud05zaWGbc5/fUjc21YGpUA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=KQoOinV7; arc=none smtp.remote-ip=74.125.82.170 Received: from mail-dy1-f170.google.com (mail-dy1-f170.google.com [74.125.82.170]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AFFA7606A31F for ; Thu, 29 Oct 2026 08:58:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org AFFA7606A31F Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=KQoOinV7 Received: by mail-dy1-f170.google.com with SMTP id 5a478bee46e88-35cd4e8bdbdso2349629eec.1 for ; Thu, 29 Oct 2026 01:58:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20260707; t=1793264299; x=1793869099; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=aLiKz2BhC5RSo/yb+qOUrvZd9mNsTY8Su064dE1oXf0=; b=KQoOinV7IsGlJE90LxDtr2QI3uALtgcoSmDANpVDPtmt5mpbR8DXDfNVF7gEwRt5wL HQzdud2i6m2MnLNgQKOPpbdfXP9efFtOK9sYRcIxL/NX9dzCki+ltfIZKPO0yKmyMB/q qjPhgKDy3qnsQZbAxGd19//WshWQsDzZAKIeLadg086NjnOeZ4xzlXYPcfEPRva9tupQ SQ422nlARNA0ESodQw9rQ489f6thndM7qem9yBKyLm7ZY8EAVLs8zhKlKpNatt46ZQS5 TYN6s6pdkNHk/xc5HRyRZLfhQoLoqftzOWF+tcJdgrfI+c8PJes6M/79OIJGYfWL+3GH VRNA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793264299; x=1793869099; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=aLiKz2BhC5RSo/yb+qOUrvZd9mNsTY8Su064dE1oXf0=; b=o+rKBn6quKgt9tqc31Ytdk6LUIE8xC17ufXnVScqgg/aZgwKmGZd6t3nyGeeJrdyLa Ea2I416GOqxSoJCz+WU0Fp0Or+cQneNBLAeyNukg7iYpws3mw5vjKXUA9I7rj/G+iRV6 cg9Hd+7mHoL+CMgfXkgUF46bQ3kNL8KdDw6rXOPPu5KxsZC4JkemcIDVWBgffuZVxSkV roR0T+ZMjMy5vn34z1OaDf5YyT4a0zMVYue92qWh9Y9xnGQrk0zTqXKIwnMW1TEXlSs/ +y//j+oS+THW9Sk1n4mCPm2JwPO6Z82Iwyk+CkDRBbhFJQQgdRxPri9pCECOtSFoRoMc UUeQ== X-Forwarded-Encrypted: i=1; AKwUvBy17hvgNKoH/Ktp4NtyOsgOg4jerbFGISN++0J49akc4wBdZKbPF/su3unLZtG9eHK6xFqkaIjVJ9mRh5M=@vger.kernel.org X-Gm-Message-State: AFq9FYKlcJzeRDcvOPNytZM9U+KXlsrPrSJvU7Lpviy8p1j6k1QHaV0n HAr3o83z+jRyBLVsw9oVGTNSTjZ0bZbhUqRVi8oBjBz0iMRA00UbADY= X-Gm-Gg: AYBFou3MYV3ezWSHDCokxoqfUaNwy60quEAlj/LCd+XK8h2hA4QPXbG3mJrGjh+rGop cd+90p5VU1SAUlbf6y3YmIkuLMI7EhaYylWP31LoBaB3JYkOXtuHNplN8oj4b9PnfrZR6seuadq RItv7cyxhpKyf0roP4oo6fL0mY9TN6R0iCGYaMo4dnxv63rlZ6aZx1LDL/eBBzkXROoeRpHjPNO S56xgdtsflZiC69+j8IVeIphP9OdnPaqipk0cuO2nLGddhPuq4zDQvk9gmmWwwEPGcwW/+OyESu VInT0XR79RgppZRLIOrEFC1V8yyvDT1xeao83nOzt/KTHQQxsXzkAbC/xDMNlu/wo7rU785MGVt TxP252/QX07k+3Ce584JZ0OVRRw5GDU8udCWl5Qcke3l8BxoWsvV7DT5aOyC/9xThQQyX+ROojr tHdC5uF/cPcHXpxntOxCL0xtbDRO48ugPAZoMz/hmTKTll3SizW1o0kvxCwuFtL5eSKLMFSij9X THDsTBlBWHBqd9TgdKGRSCAboHclGS2WcnD/2mAKXU5nImoJnv91njPA0kevuo8HUB90Jsid7Zz aYJrzfKk5TgzWRdY52ht2OMmFHfFObv2iffg1f6YtA+0NtL+z7YKH4tGTIdj5Q== X-Received: by 2002:a05:693c:8944:10b0:369:2f25:33a7 with SMTP id 5a478bee46e88-36a200beec9mr6691678eec.15.1793264298696; Thu, 29 Oct 2026 01:58:18 -0700 (PDT) Received: from at-Standard-PC-Q35-ICH9-2009 ([27.60.20.232]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36a23641e78sm16497937eec.0.2026.10.29.01.58.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2026 01:58:17 -0700 (PDT) From: Atharva Tiwari To: Cc: Atharva Tiwari , Bjorn Helgaas , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , "Rafael J. Wysocki" , Len Brown , Linus Walleij , Bartosz Golaszewski , Sven Peter , Janne Grunau , Neal Gompa , Guenter Roeck , Jonathan Cameron , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , Lee Jones , Pavel Machek , Griffin Kroah-Hartman , Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Sebastian Reichel , Alexandre Belloni , Wim Van Sebroeck , Jarkko Sakkinen , Mimi Zohar , Roberto Sassu , Dmitry Kasatkin , Eric Snowberg , Paul Moore , James Morris , "Serge E. Hallyn" , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-hwmon@vger.kernel.org, linux-iio@vger.kernel.org, linux-leds@vger.kernel.org, mfd@lists.linux.dev, platform-driver-x86@vger.kernel.org, linux-pm@vger.kernel.org, linux-rtc@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-integrity@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [RFC PATCH 05/14] iio/accel: add driver for apple SMS Date: Thu, 29 Oct 2026 04:52:02 -0400 Message-ID: <20261029085504.3547-6-atharvatiwarilinuxdev@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261029085504.3547-1-atharvatiwarilinuxdev@gmail.com> References: <20261029085504.3547-1-atharvatiwarilinuxdev@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add a driver for the Sudden Motion Sensor accelerometer, exposed through IIO. It reports the three axes and also drop, orientation and shock events. This replaces the motion sensor support in applesmc. Signed-off-by: Atharva Tiwari --- drivers/iio/accel/Kconfig | 10 ++ drivers/iio/accel/Makefile | 1 + drivers/iio/accel/macsmc-accel.c | 248 +++++++++++++++++++++++++++++++ drivers/mfd/macsmc-core.c | 10 ++ 4 files changed, 269 insertions(+) create mode 100644 drivers/iio/accel/macsmc-accel.c diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig index 141ac9842..50bc127a4 100644 --- a/drivers/iio/accel/Kconfig +++ b/drivers/iio/accel/Kconfig @@ -532,6 +532,16 @@ config KXCJK1013 To compile this driver as a module, choose M here: the module will be called kxcjk-1013. +config MACSMC_ACCEL + tristate "Apple SMC Motion Sensor Driver" + depends on MACSMC_ACPI + help + Say yes here if you want support for Apple Motion Sensors, that uses + the System Management Controller. + + To compile this driver as a module, choose M here: the module will + be called macsmc-accel. + config MC3230 tristate "mCube MC3230 Digital Accelerometer Driver" depends on I2C diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile index fa440a859..52fe661de 100644 --- a/drivers/iio/accel/Makefile +++ b/drivers/iio/accel/Makefile @@ -54,6 +54,7 @@ obj-$(CONFIG_KXSD9) += kxsd9.o obj-$(CONFIG_KXSD9_SPI) += kxsd9-spi.o obj-$(CONFIG_KXSD9_I2C) += kxsd9-i2c.o obj-$(CONFIG_MC3230) += mc3230.o +obj-$(CONFIG_MACSMC_ACCEL) += macsmc-accel.o obj-$(CONFIG_MMA7455) += mma7455_core.o obj-$(CONFIG_MMA7455_I2C) += mma7455_i2c.o diff --git a/drivers/iio/accel/macsmc-accel.c b/drivers/iio/accel/macsmc-accel.c new file mode 100644 index 000000000..0abf81e7b --- /dev/null +++ b/drivers/iio/accel/macsmc-accel.c @@ -0,0 +1,248 @@ +// SPDX-License-Identifier: GPL-2.0-only OR MIT +/* + * Apple SMC sudden motion sensor (SMS) driver + * + * Copyright (C) 2026 Atharva Tiwari + * + * Based on drivers/hwmon/applesmc.c: + * Copyright (C) 2007 Nicolas Boichat + * Copyright (C) 2010 Henrik Rydberg + */ + +#include +#include +#include +#include +#include +#include +#include + +struct macsmc_accel { + struct apple_smc *smc; + struct iio_dev *indio_dev; + struct notifier_block nb; +}; + +enum { + SMS_DROP = 0, + SMS_ORIENTATION, + SMS_SHOCK, +}; + +static int macsmc_accel_read(struct macsmc_accel *drv, smc_key key, s16 *p) +{ + int ret; + + ret = apple_smc_read_s16(drv->smc, key, p); + if (ret < 0) + return ret; + + *p = (s16)be16_to_cpu(*p); + return 0; +} + +static int macsmc_accel_dev_init(struct macsmc_accel *drv) +{ + int ret, total; + u16 buf; + + for (total = 0; total < 100; total++) { + ret = apple_smc_read_u16(drv->smc, SMC_KEY(MOCN), &buf); + if (!ret && buf) + return 0; + + buf = 0xE0; + apple_smc_write_u16(drv->smc, SMC_KEY(MOCN), buf); + msleep(50); + } + + return -ENODEV; +} + +static int macsmc_accel_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct macsmc_accel *drv = iio_priv(indio_dev); + int ret; + s16 buf; + + if (mask != IIO_CHAN_INFO_RAW) + return -EINVAL; + + switch (chan->channel2) { + case IIO_MOD_X: + ret = macsmc_accel_read(drv, SMC_KEY(MO_X), &buf); + if (ret < 0) + return ret; + + *val = buf; + return IIO_VAL_INT; + case IIO_MOD_Y: + ret = macsmc_accel_read(drv, SMC_KEY(MO_Y), &buf); + if (ret < 0) + return ret; + + *val = buf; + return IIO_VAL_INT; + case IIO_MOD_Z: + ret = macsmc_accel_read(drv, SMC_KEY(MO_Z), &buf); + if (ret < 0) + return ret; + + *val = buf; + return IIO_VAL_INT; + } + + return -EINVAL; +} + +static int macsmc_accel_event(struct notifier_block *nb, unsigned long event, void *data) +{ + struct macsmc_accel *drv = container_of(nb, struct macsmc_accel, nb); + u64 code; + + /* check if event is for us */ + if (event != 0x60 && event != 0x69 && event != 0x6F) + return NOTIFY_DONE; + + switch (event) { + case 0x60: + code = IIO_UNMOD_EVENT_CODE(IIO_ACCEL, SMS_DROP, + IIO_EV_TYPE_CHANGE, + IIO_EV_DIR_NONE); + break; + case 0x69: + code = IIO_UNMOD_EVENT_CODE(IIO_ACCEL, SMS_ORIENTATION, + IIO_EV_TYPE_CHANGE, + IIO_EV_DIR_NONE); + break; + case 0x6F: + code = IIO_UNMOD_EVENT_CODE(IIO_ACCEL, SMS_SHOCK, + IIO_EV_TYPE_CHANGE, + IIO_EV_DIR_NONE); + break; + } + + iio_push_event(drv->indio_dev, code, iio_get_time_ns(drv->indio_dev)); + return NOTIFY_OK; +} + +static void macsmc_accel_unregister_notifier(void *data) +{ + struct macsmc_accel *drv = data; + + blocking_notifier_chain_unregister(drv->smc->event_handlers, + &drv->nb); +} + +static const struct iio_event_spec macsmc_accel_event_spec = { + .type = IIO_EV_TYPE_CHANGE, + .dir = IIO_EV_DIR_NONE, + .mask_separate = BIT(IIO_EV_INFO_ENABLE), +}; + +static const struct iio_chan_spec macsmc_accel_channels[] = { + { + .type = IIO_ACCEL, + .modified = 1, + .channel2 = IIO_MOD_X, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + }, + { + .type = IIO_ACCEL, + .modified = 1, + .channel2 = IIO_MOD_Y, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + }, + { + .type = IIO_ACCEL, + .modified = 1, + .channel2 = IIO_MOD_Z, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + }, + { + .type = IIO_ACCEL, + .channel = SMS_DROP, + .event_spec = &macsmc_accel_event_spec, + .num_event_specs = 1, + }, + { + .type = IIO_ACCEL, + .channel = SMS_ORIENTATION, + .event_spec = &macsmc_accel_event_spec, + .num_event_specs = 1, + }, + { + .type = IIO_ACCEL, + .channel = SMS_SHOCK, + .event_spec = &macsmc_accel_event_spec, + .num_event_specs = 1, + }, +}; + +static const struct iio_info macsmc_accel_info = { + .read_raw = macsmc_accel_read_raw +}; + +static int macsmc_accel_restore(struct device *dev) +{ + struct macsmc_accel *drv = dev_get_drvdata(dev); + + return macsmc_accel_dev_init(drv); +} + +static const struct dev_pm_ops macsmc_accel_pm_ops = { + .restore = macsmc_accel_restore, +}; + +static int macsmc_accel_probe(struct platform_device *pdev) +{ + struct macsmc_accel *drv; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*drv)); + if (!indio_dev) + return -ENOMEM; + + drv = iio_priv(indio_dev); + drv->smc = dev_get_drvdata(pdev->dev.parent); + + ret = macsmc_accel_dev_init(drv); + if (ret) + return ret; + + drv->indio_dev = indio_dev; + drv->nb.notifier_call = macsmc_accel_event; + ret = blocking_notifier_chain_register(drv->smc->event_handlers, &drv->nb); + if (ret) + return ret; + + ret = devm_add_action_or_reset(&pdev->dev, macsmc_accel_unregister_notifier, drv); + if (ret) + return ret; + + platform_set_drvdata(pdev, drv); + + indio_dev->name = "macsmc-accel"; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &macsmc_accel_info; + indio_dev->channels = macsmc_accel_channels; + indio_dev->num_channels = ARRAY_SIZE(macsmc_accel_channels); + + return devm_iio_device_register(&pdev->dev, indio_dev); +} + +static struct platform_driver macsmc_accel_driver = { + .probe = macsmc_accel_probe, + .driver = { + .name = "macsmc-accel", + .pm = &macsmc_accel_pm_ops, + }, +}; +module_platform_driver(macsmc_accel_driver); + +MODULE_AUTHOR("Atharva Tiwari "); +MODULE_DESCRIPTION("Apple SMC Motion Sensor Driver"); +MODULE_LICENSE("Dual MIT/GPL"); +MODULE_ALIAS("platform:macsmc-accel"); diff --git a/drivers/mfd/macsmc-core.c b/drivers/mfd/macsmc-core.c index 6014df4fe..6567d2f1f 100644 --- a/drivers/mfd/macsmc-core.c +++ b/drivers/mfd/macsmc-core.c @@ -24,6 +24,10 @@ static const struct mfd_cell apple_smc_rtkit_devs[] = { * There isn't device tree on acpi backend, so we need to use * apple_smc_key_exists to register mfd devs */ +static const struct mfd_cell apple_smc_acpi_accel[] = { + MFD_CELL_NAME("macsmc-accel"), +}; + static const struct mfd_cell apple_smc_acpi_common[] = { MFD_CELL_NAME("macsmc-hwmon"), MFD_CELL_NAME("macsmc-power"), @@ -169,6 +173,12 @@ int apple_smc_probe(struct device *dev, const struct apple_smc_backend_ops *ops, return ret; } + if (apple_smc_key_exists(smc, SMC_KEY(MOCN))) { + ret = devm_mfd_add_devices(dev, -1, apple_smc_acpi_accel, + ARRAY_SIZE(apple_smc_acpi_accel), NULL, 0, NULL); + if (ret < 0) + return ret; + } } else ret = devm_mfd_add_devices(dev, -1, apple_smc_rtkit_devs, ARRAY_SIZE(apple_smc_rtkit_devs), NULL, 0, NULL); -- 2.55.0