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Sun, 8 Mar 2026 19:41:17 +0100 (CET) From: Markus Probst Date: Sun, 08 Mar 2026 18:41:18 +0000 Subject: [PATCH v2 1/2] dt-bindings: mfd: Add synology,microp device Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260308-synology_microp_initial-v2-1-9389963f31c5@posteo.de> References: <20260308-synology_microp_initial-v2-0-9389963f31c5@posteo.de> In-Reply-To: <20260308-synology_microp_initial-v2-0-9389963f31c5@posteo.de> To: Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Greg Kroah-Hartman , Miguel Ojeda , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, Markus Probst X-Developer-Signature: v=1; a=openpgp-sha256; l=1987; 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preference=encrypt Add the Synology Microp devicetree bindings. Those devices are microcontrollers found on Synology NAS devices. They are connected to a serial port on the host device. Those devices are used to control certain LEDs, fan speeds, a beeper, to handle buttons, fan failures and to properly shutdown and reboot the device. Signed-off-by: Markus Probst --- .../devicetree/bindings/mfd/synology,microp.yaml | 49 ++++++++++++++++++= ++++ 1 file changed, 49 insertions(+) diff --git a/Documentation/devicetree/bindings/mfd/synology,microp.yaml b/D= ocumentation/devicetree/bindings/mfd/synology,microp.yaml new file mode 100644 index 000000000000..60609bb19b66 --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/synology,microp.yaml @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mfd/synology,microp.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Synology NAS on-board Microcontroller + +maintainers: + - Markus Probst + +description: + Synology devices contain a microcontroller on their device to control + certain leds, fan speeds, a beeper, to properly handle system shutdown + and reboot, buttons and fan failures. + +properties: + compatible: + const: synology,microp + +patternProperties: + "^(power|status|alert|usb)-led$": + $ref: /schemas/leds/common.yaml + unevaluatedProperties: false + +required: + - compatible + - power-led + - status-led + +additionalProperties: false + +examples: + - | + #include + + mcu { + compatible =3D "synology,microp"; 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preference=encrypt Add a initial synology microp driver, written in Rust. The driver targets a microcontroller found in Synology NAS devices. It currently only supports controlling of the power led, status led, alert led and usb led. Other components such as fan control or handling on-device buttons will be added once the required rust abstractions are there. Signed-off-by: Markus Probst --- MAINTAINERS | 6 + drivers/mfd/Kconfig | 2 + drivers/mfd/Makefile | 2 + drivers/mfd/synology_microp/Kconfig | 14 ++ drivers/mfd/synology_microp/Makefile | 2 + drivers/mfd/synology_microp/TODO | 7 + drivers/mfd/synology_microp/command.rs | 50 +++++ drivers/mfd/synology_microp/led.rs | 275 +++++++++++++++++++++= ++++ drivers/mfd/synology_microp/synology_microp.rs | 82 ++++++++ rust/uapi/uapi_helper.h | 2 + 10 files changed, 442 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index e9e83ab552c7..092cd9e8a730 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -25550,6 +25550,12 @@ F: drivers/dma-buf/sync_* F: include/linux/sync_file.h F: include/uapi/linux/sync_file.h =20 +SYNOLOGY MICROP DRIVER +M: Markus Probst +S: Maintained +F: Documentation/devicetree/bindings/mfd/synology,microp.yaml +F: drivers/mfd/synology_microp/ + SYNOPSYS ARC ARCHITECTURE M: Vineet Gupta L: linux-snps-arc@lists.infradead.org diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 7192c9d1d268..bc269719749f 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -2580,5 +2580,7 @@ config MFD_MAX7360 additional drivers must be enabled in order to use the functionality of the device. =20 +source "drivers/mfd/synology_microp/Kconfig" + endmenu endif diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index e75e8045c28a..0a6fa33d5c35 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -304,3 +304,5 @@ obj-$(CONFIG_MFD_RSMU_SPI) +=3D rsmu_spi.o rsmu_core.o obj-$(CONFIG_MFD_UPBOARD_FPGA) +=3D upboard-fpga.o =20 obj-$(CONFIG_MFD_LOONGSON_SE) +=3D loongson-se.o + +obj-$(CONFIG_MFD_SYNOLOGY_MICROP) +=3D synology_microp/ diff --git a/drivers/mfd/synology_microp/Kconfig b/drivers/mfd/synology_mic= rop/Kconfig new file mode 100644 index 000000000000..4bbbcf0b6e94 --- /dev/null +++ b/drivers/mfd/synology_microp/Kconfig @@ -0,0 +1,14 @@ + +config MFD_SYNOLOGY_MICROP + tristate "Synology Microp driver" + depends on RUST + depends on SERIAL_DEV_BUS + depends on LEDS_CLASS && LEDS_CLASS_MULTICOLOR + default n + help + Enable support for the MCU found in Synology NAS devices. + + This is needed to properly shutdown and reboot the device, as well as + additional functionality like fan and LED control. + + This driver is work in progress and may not be fully functional. diff --git a/drivers/mfd/synology_microp/Makefile b/drivers/mfd/synology_mi= crop/Makefile new file mode 100644 index 000000000000..d762cada20c9 --- /dev/null +++ b/drivers/mfd/synology_microp/Makefile @@ -0,0 +1,2 @@ + +obj-y +=3D synology_microp.o diff --git a/drivers/mfd/synology_microp/TODO b/drivers/mfd/synology_microp= /TODO new file mode 100644 index 000000000000..1961a33115db --- /dev/null +++ b/drivers/mfd/synology_microp/TODO @@ -0,0 +1,7 @@ +TODO: +- add missing components: + - handle on-device buttons (Power, Factory reset, "USB Copy") + - handle fan failure + - beeper + - fan speed control + - correctly perform device power-off and restart on Synology devices diff --git a/drivers/mfd/synology_microp/command.rs b/drivers/mfd/synology_= microp/command.rs new file mode 100644 index 000000000000..78f82a86f1b2 --- /dev/null +++ b/drivers/mfd/synology_microp/command.rs @@ -0,0 +1,50 @@ +// SPDX-License-Identifier: GPL-2.0 + +use kernel::{ + device::Bound, + error::Result, + serdev, // +}; + +use crate::led; + +#[derive(Copy, Clone)] +#[expect( + clippy::enum_variant_names, + reason =3D "future variants will not end with Led" +)] +pub(crate) enum Command { + PowerLed(led::State), + StatusLed(led::StatusLedColor, led::State), + AlertLed(led::State), + UsbLed(led::State), +} + +impl Command { + pub(crate) fn write(self, dev: &serdev::Device) -> Result<()> { + dev.write_all( + match self { + Command::PowerLed(led::State::On) =3D> &[0x34], + Command::PowerLed(led::State::Blink) =3D> &[0x35], + Command::PowerLed(led::State::Off) =3D> &[0x36], + + Command::StatusLed(_, led::State::Off) =3D> &[0x37], + Command::StatusLed(led::StatusLedColor::Green, led::State:= :On) =3D> &[0x38], + Command::StatusLed(led::StatusLedColor::Green, led::State:= :Blink) =3D> &[0x39], + Command::StatusLed(led::StatusLedColor::Orange, led::State= ::On) =3D> &[0x3A], + Command::StatusLed(led::StatusLedColor::Orange, led::State= ::Blink) =3D> &[0x3B], + + Command::AlertLed(led::State::On) =3D> &[0x4C, 0x41, 0x31], + Command::AlertLed(led::State::Blink) =3D> &[0x4C, 0x41, 0x= 32], + Command::AlertLed(led::State::Off) =3D> &[0x4C, 0x41, 0x33= ], + + Command::UsbLed(led::State::On) =3D> &[0x40], + Command::UsbLed(led::State::Blink) =3D> &[0x41], + Command::UsbLed(led::State::Off) =3D> &[0x42], + }, + serdev::Timeout::Max, + )?; + dev.wait_until_sent(serdev::Timeout::Max); + Ok(()) + } +} diff --git a/drivers/mfd/synology_microp/led.rs b/drivers/mfd/synology_micr= op/led.rs new file mode 100644 index 000000000000..28a765b1e6c2 --- /dev/null +++ b/drivers/mfd/synology_microp/led.rs @@ -0,0 +1,275 @@ +// SPDX-License-Identifier: GPL-2.0 + +use core::sync::atomic::{ + AtomicBool, + Ordering, // +}; + +use kernel::{ + device::{ + property::FwNode, + Bound, // + }, + devres::Devres, + error::Error, + led::{self, MultiColorSubLed}, + macros::vtable, + prelude::*, + serdev, + types::ARef, // +}; + +use crate::command::Command; + +pub(crate) struct SynologyMicropLedHandler { + blink: AtomicBool, + map: fn(State) -> Command, +} + +pub(crate) struct SynologyMicropStatusLedHandler { + blink: AtomicBool, +} + +#[derive(Copy, Clone)] +pub(crate) enum State { + On, + Blink, + Off, +} + +#[derive(Copy, Clone)] +pub(crate) enum StatusLedColor { + Green, + Orange, +} + +impl SynologyMicropLedHandler { + fn register_by_fwnode<'a>( + parent: &'a serdev::Device, + default_trigger: &'static CStr, + brightness: u32, + color: led::Color, + map: fn(State) -> Command, + fwnode: Option>, + ) -> impl PinInit>, Error> + 'a { + led::DeviceBuilder::new() + .fwnode(fwnode) + .default_trigger(default_trigger) + .initial_brightness(brightness) + .devicename(c"synology-microp") + .color(color) + .build( + parent, + Ok(Self { + blink: AtomicBool::new(true), + map, + }), + ) + } + + fn register<'a>( + parent: &'a serdev::Device, + fwnode_child_name: &'static CStr, + default_trigger: &'static CStr, + brightness: u32, + color: led::Color, + map: fn(State) -> Command, + ) -> impl PinInit>, Error> + 'a { + Self::register_by_fwnode( + parent, + default_trigger, + brightness, + color, + map, + parent + .as_ref() + .fwnode() + .and_then(|fwnode| fwnode.get_child_by_name(fwnode_child_n= ame)), + ) + } + + fn register_optional<'a>( + parent: &'a serdev::Device, + fwnode_child_name: &'static CStr, + default_trigger: &'static CStr, + brightness: u32, + color: led::Color, + map: fn(State) -> Command, + ) -> Option>, Error> + 'a> { + parent + .as_ref() + .fwnode() + .and_then(|fwnode| fwnode.get_child_by_name(fwnode_child_name)) + .map(|fwnode| { + Self::register_by_fwnode( + parent, + default_trigger, + brightness, + color, + map, + Some(fwnode), + ) + }) + } + + pub(crate) fn register_power<'a>( + parent: &'a serdev::Device, + ) -> impl PinInit>, Error> + 'a { + Self::register( + parent, + c"power-led", + c"timer", + 1, + led::Color::Blue, + Command::PowerLed, + ) + } + + pub(crate) fn register_alert<'a>( + parent: &'a serdev::Device, + ) -> Option>, Error> + 'a> { + Self::register_optional( + parent, + c"alert-led", + c"none", + 0, + led::Color::Orange, + Command::AlertLed, + ) + } + + pub(crate) fn register_usb<'a>( + parent: &'a serdev::Device, + ) -> Option>, Error> + 'a> { + Self::register_optional( + parent, + c"usb-led", + c"none", + 0, + led::Color::Green, + Command::UsbLed, + ) + } +} + +#[vtable] +impl led::LedOps for SynologyMicropLedHandler { + type Bus =3D serdev::Device; + type Mode =3D led::Normal; + const BLOCKING: bool =3D true; + const MAX_BRIGHTNESS: u32 =3D 1; + + fn brightness_set( + &self, + dev: &Self::Bus, + _classdev: &led::Device, + brightness: u32, + ) -> Result<()> { + (self.map)(if brightness =3D=3D 0 { + self.blink.store(false, Ordering::Relaxed); + State::Off + } else if self.blink.load(Ordering::Relaxed) { + State::Blink + } else { + State::On + }) + .write(dev) + } + + fn blink_set( + &self, + dev: &Self::Bus, + _classdev: &led::Device, + delay_on: &mut usize, + delay_off: &mut usize, + ) -> Result<()> { + *delay_on =3D 167; + *delay_off =3D 167; + + self.blink.store(true, Ordering::Relaxed); + (self.map)(State::Blink).write(dev) + } +} + +impl SynologyMicropStatusLedHandler { + pub(crate) fn register( + parent: &serdev::Device, + ) -> impl PinInit>, Error> + '_ { + const SUBLEDS: &[MultiColorSubLed] =3D &[ + MultiColorSubLed::new(led::Color::Green).initial_intensity(1), + MultiColorSubLed::new(led::Color::Orange), + ]; + + led::DeviceBuilder::new() + .fwnode( + parent + .as_ref() + .fwnode() + .and_then(|fwnode| fwnode.get_child_by_name(c"status-l= ed")), + ) + .devicename(c"synology-microp") + .color(led::Color::Multi) + .build_multicolor( + parent, + Ok(SynologyMicropStatusLedHandler { + blink: AtomicBool::new(false), + }), + SUBLEDS, + ) + } +} + +#[vtable] +impl led::LedOps for SynologyMicropStatusLedHandler { + type Bus =3D serdev::Device; + type Mode =3D led::MultiColor; + const BLOCKING: bool =3D true; + const MAX_BRIGHTNESS: u32 =3D 1; + + fn brightness_set( + &self, + dev: &Self::Bus, + classdev: &led::MultiColorDevice, + brightness: u32, + ) -> Result<()> { + if brightness =3D=3D 0 { + self.blink.store(false, Ordering::Relaxed); + } + + let (color, subled_brightness) =3D if classdev.subleds()[1].bright= ness =3D=3D 0 { + (StatusLedColor::Green, classdev.subleds()[0].brightness) + } else { + (StatusLedColor::Orange, classdev.subleds()[1].brightness) + }; + + if subled_brightness =3D=3D 0 { + Command::StatusLed(color, State::Off) + } else if self.blink.load(Ordering::Relaxed) { + Command::StatusLed(color, State::Blink) + } else { + Command::StatusLed(color, State::On) + } + .write(dev) + } + + fn blink_set( + &self, + dev: &Self::Bus, + classdev: &led::MultiColorDevice, + delay_on: &mut usize, + delay_off: &mut usize, + ) -> Result<()> { + *delay_on =3D 167; + *delay_off =3D 167; + + self.blink.store(true, Ordering::Relaxed); + + let color =3D if classdev.subleds()[1].brightness =3D=3D 0 { + StatusLedColor::Green + } else { + StatusLedColor::Orange + }; + + Command::StatusLed(color, State::Blink).write(dev) + } +} diff --git a/drivers/mfd/synology_microp/synology_microp.rs b/drivers/mfd/s= ynology_microp/synology_microp.rs new file mode 100644 index 000000000000..e92de7da3e46 --- /dev/null +++ b/drivers/mfd/synology_microp/synology_microp.rs @@ -0,0 +1,82 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Synology Microp driver + +use kernel::{ + device, + devres::{self, Devres}, + of, + prelude::*, + serdev, // +}; +use pin_init::pin_init_scope; + +use crate::{ + led::{ + SynologyMicropLedHandler, + SynologyMicropStatusLedHandler, // + }, // +}; + +pub(crate) mod command; +mod led; + +kernel::module_serdev_device_driver! { + type: SynologyMicropDriver, + name: "synology_microp", + authors: ["Markus Probst "], + description: "Synology Microp driver", + license: "GPL v2", + params: { + check_fan: i32 { + default: 1, + description: "Check for cpu fan failures", + }, + }, +} + +#[pin_data] +struct SynologyMicropDriver { + #[pin] + power_led: Devres>, + #[pin] + status_led: Devres>, +} + +kernel::of_device_table!( + OF_TABLE, + MODULE_OF_TABLE, + ::IdInfo, + [(of::DeviceId::new(c"synology,microp"), ()),] +); + +#[vtable] +impl serdev::Driver for SynologyMicropDriver { + type IdInfo =3D (); + const OF_ID_TABLE: Option> =3D Some(= &OF_TABLE); + + fn probe( + dev: &serdev::Device, + _id_info: Option<&Self::IdInfo>, + ) -> impl PinInit { + pin_init_scope(move || { + let _ =3D dev.set_baudrate(9600); + dev.set_flow_control(false); + dev.set_parity(serdev::Parity::None)?; + + // TODO: Replace with Option field on SynologyMicropDriver once + // https://github.com/Rust-for-Linux/pin-init/issues/59 has be= en resolved. + if let Some(alert_led) =3D SynologyMicropLedHandler::register_= alert(dev) { + devres::register(dev.as_ref(), alert_led, GFP_KERNEL)?; + } + if let Some(usb_led) =3D SynologyMicropLedHandler::register_us= b(dev) { + devres::register(dev.as_ref(), usb_led, GFP_KERNEL)?; + } + + Ok(try_pin_init!(Self { + power_led <- SynologyMicropLedHandler::register_power(dev), + status_led <- SynologyMicropStatusLedHandler::register(dev= ), + })) + }) + } +} diff --git a/rust/uapi/uapi_helper.h b/rust/uapi/uapi_helper.h index 06d7d1a2e8da..94b6c1b59e56 100644 --- a/rust/uapi/uapi_helper.h +++ b/rust/uapi/uapi_helper.h @@ -14,3 +14,5 @@ #include #include #include +#include + --=20 2.52.0