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charset="utf-8" The device has no GET_REPORT and every OUT report carries all 10 channels, so the cache has to start at some value. Starting at 0 means the first sysfs write to a single channel also sends 0% on the other nine. The MCU factory default is 40%. Initialize pwm_duty[] to 102 (40% on the 0-255 sysfs scale) at probe and on reset-resume. Any initial cache can be stale if the module is reloaded without a device reset. 40% matches the hardware after power-on or power-loss resume, and a first single-channel write leaves the fans running at a safe speed. PWM is still not taken from periodic IN reports: the device is manual-only and the host cache stays authoritative after the first successful write. Signed-off-by: Aureo Serrano de Souza --- Documentation/hwmon/arctic_fan_controller.rst | 26 +++++++++---------- drivers/hwmon/arctic_fan_controller.c | 18 ++++++++----- 2 files changed, 23 insertions(+), 21 deletions(-) diff --git a/Documentation/hwmon/arctic_fan_controller.rst b/Documentation/= hwmon/arctic_fan_controller.rst index b5be88ae464..200e51932a1 100644 --- a/Documentation/hwmon/arctic_fan_controller.rst +++ b/Documentation/hwmon/arctic_fan_controller.rst @@ -29,18 +29,16 @@ Usage notes Since it is a USB device, hotplug is supported. The device is autodetected. =20 The device does not support GET_REPORT, so the driver cannot read back the -current hardware PWM state at probe time. The cached PWM values (readable -via pwm[1-10]) start at 0 and reflect only values that have been -successfully written. Because each OUT report carries all 10 channel value= s, -writing a single channel also sends the cached values for all other channe= ls. -Users should set all channels to the desired values before relying on the -cached state. - -On system suspend, the device may lose power and reset its PWM channels to -hardware defaults. The driver clears its cached duty values on resume so -that reads reflect the unknown hardware state rather than stale pre-suspend -values. Userspace is responsible for re-applying the desired duty cycles -after resume. +current hardware PWM state at probe time. Each OUT report carries all 10 +channels, so pwm[1-10] is a host cache. It starts at the MCU factory +default of 40% (sysfs 102). After a successful write, the cache reflects +that value. Users should set all channels to the desired values before +relying on the cached state. + +On system suspend, the device may lose power and reset PWM to the factory +default. The driver restores the cache to 40% on resume. If the device +kept power across suspend, userspace should re-apply the desired duty +cycles. =20 Sysfs entries ------------- @@ -51,6 +49,6 @@ pwm[1-10] PWM duty cycle (0-255). Write: sends an = OUT report setting the duty cycle (scaled from 0-255 to 0-100% for the device); the cached value is updated only after the device ACKs the command with a success status. Read: returns the last - successfully written value; initialized to 0 at driver lo= ad - and after resume (hardware state unknown). + successfully written value; initialized to 102 (40%) at + driver load and after resume (MCU factory default). =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D diff --git a/drivers/hwmon/arctic_fan_controller.c b/drivers/hwmon/arctic_f= an_controller.c index dbe84cd93c0..9a609257273 100644 --- a/drivers/hwmon/arctic_fan_controller.c +++ b/drivers/hwmon/arctic_fan_controller.c @@ -35,6 +35,8 @@ * Measured over 500 iterations: max ~563 ms. Keep 1 s as margin. */ #define ARCTIC_ACK_TIMEOUT_MS 1000 +/* MCU factory default; 40% of 0-255 is 102. */ +#define ARCTIC_PWM_DEFAULT 102 =20 struct arctic_fan_data { struct hid_device *hdev; @@ -164,7 +166,7 @@ static int arctic_fan_write(struct device *dev, enum hw= mon_sensor_types type, =20 /* * Build the buffer and arm write_pending under in_report_lock so that - * reset_resume() cannot clear pwm_duty[] between the pwm_duty[] read + * reset_resume() cannot replace pwm_duty[] between the pwm_duty[] read * and the buffer write, and raw_event() cannot deliver a stale ACK * from a previous write into this write's completion. * @@ -256,14 +258,14 @@ static int arctic_fan_reset_resume(struct hid_device = *hdev) unsigned long flags; =20 /* - * The device resets its PWM channels to hardware defaults on power - * loss during suspend. Clear the cached duty values so they reflect - * the unknown hardware state, consistent with probe-time behaviour - * (the device has no GET_REPORT support). Hold in_report_lock so - * this does not race with a concurrent pwm read or write callback. + * The device resets its PWM channels to the MCU factory default + * (40%) on power loss during suspend. Restore the cache to that + * same default, consistent with probe-time behaviour (the device + * has no GET_REPORT support). Hold in_report_lock so this does + * not race with a concurrent pwm read or write callback. */ spin_lock_irqsave(&priv->in_report_lock, flags); - memset(priv->pwm_duty, 0, sizeof(priv->pwm_duty)); + memset(priv->pwm_duty, ARCTIC_PWM_DEFAULT, sizeof(priv->pwm_duty)); spin_unlock_irqrestore(&priv->in_report_lock, flags); return 0; } @@ -288,6 +290,8 @@ static int arctic_fan_probe(struct hid_device *hdev, priv->hdev =3D hdev; spin_lock_init(&priv->in_report_lock); init_completion(&priv->in_report_received); + /* Same MCU factory default as reset_resume(); see ARCTIC_PWM_DEFAULT abo= ve. */ + memset(priv->pwm_duty, ARCTIC_PWM_DEFAULT, sizeof(priv->pwm_duty)); hid_set_drvdata(hdev, priv); =20 ret =3D hid_hw_start(hdev, HID_CONNECT_DRIVER); --=20 2.43.0 From nobody Fri Sep 25 17:45:13 2026 Received: from FR5P281CU006.outbound.protection.outlook.com (mail-germanywestcentralazon11022088.outbound.protection.outlook.com [40.107.149.88]) (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 907AC393DE0; 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charset="utf-8" The in-tree driver is solely authored by ARCTIC. Keep the existing GPL-2.0-or-later grant and add BSD-2-Clause so the files may be used under either license. Signed-off-by: Aureo Serrano de Souza --- Documentation/hwmon/arctic_fan_controller.rst | 2 +- drivers/hwmon/arctic_fan_controller.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/Documentation/hwmon/arctic_fan_controller.rst b/Documentation/= hwmon/arctic_fan_controller.rst index 200e51932a1..60ac09a9cea 100644 --- a/Documentation/hwmon/arctic_fan_controller.rst +++ b/Documentation/hwmon/arctic_fan_controller.rst @@ -1,4 +1,4 @@ -.. SPDX-License-Identifier: GPL-2.0-or-later +.. SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause =20 Kernel driver arctic_fan_controller =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D diff --git a/drivers/hwmon/arctic_fan_controller.c b/drivers/hwmon/arctic_f= an_controller.c index 9a609257273..9eb83a149cd 100644 --- a/drivers/hwmon/arctic_fan_controller.c +++ b/drivers/hwmon/arctic_fan_controller.c @@ -1,4 +1,4 @@ -// SPDX-License-Identifier: GPL-2.0-or-later +// SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause /* * Linux hwmon driver for ARCTIC Fan Controller * @@ -375,4 +375,4 @@ module_hid_driver(arctic_fan_driver); =20 MODULE_AUTHOR("Aureo Serrano de Souza "); MODULE_DESCRIPTION("HID hwmon driver for ARCTIC Fan Controller"); -MODULE_LICENSE("GPL"); +MODULE_LICENSE("Dual BSD/GPL"); --=20 2.43.0 From nobody Fri Sep 25 17:45:13 2026 Received: from FR5P281CU006.outbound.protection.outlook.com (mail-germanywestcentralazon11022102.outbound.protection.outlook.com [40.107.149.102]) (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 892BC13CF82; 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charset="utf-8" Route driver maintenance mail to the shared ARCTIC (HK) alias instead of a personal mailbox. Signed-off-by: Aureo Serrano de Souza --- MAINTAINERS | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/MAINTAINERS b/MAINTAINERS index 2c1d85ad307..90cdd80704c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2177,7 +2177,7 @@ F: drivers/net/arcnet/ F: include/uapi/linux/if_arcnet.h =20 ARCTIC FAN CONTROLLER DRIVER -M: Aureo Serrano de Souza +M: ARCTIC (HK) L: linux-hwmon@vger.kernel.org S: Maintained F: Documentation/hwmon/arctic_fan_controller.rst --=20 2.43.0