From nobody Thu Apr 2 09:29:07 2026 Received: from mout02.posteo.de (mout02.posteo.de [185.67.36.66]) (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 464CE374722 for ; Sun, 29 Mar 2026 17:22:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.67.36.66 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774804972; cv=none; b=uR8QvuVOvEG4u3sT5njnKgQXeUeivG6MUYa489fk2KmZmVUpC4JKNr1tXIlVa07GH/nnN9iMDimZbMDsM75G0e2uKDBv4JqwagQ8QJ0LPftuNTh8LJ7N4hI1WYRIfHmd90ezRheVNiVVv2hLGk2tpoG7+uDl4DmvY1LW3DnDdsM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774804972; c=relaxed/simple; bh=zdwp4NNgFfvRIvYjtCKYF8YDPW9jE+7dJKS4sgsjRTo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=PuYLHAJyz4bwOvpUAKEix/QKbNnFNiuk4P5KHCaH6VGDC78GQsgDuyjKrEuiUFT3zkbTyKrdXlr89eRWUWVxgUqm98FQZwZXDqC2SEW1nU5Yh4CSuToRo0iI1rPBOYpW5FnRaxmjNEd/JETdleHi2Tl9Okf6TvZPcR13a+rpno0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=posteo.de; spf=pass smtp.mailfrom=posteo.de; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b=YrMcqWAN; arc=none smtp.client-ip=185.67.36.66 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=posteo.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=posteo.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b="YrMcqWAN" Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id E8912240104 for ; Sun, 29 Mar 2026 19:22:35 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=posteo.de; s=2017; t=1774804955; bh=Pam4GgQs35Wt+h5iJjbhd0iaxYfo7309XAPP4E8NHrQ=; h=From:Date:Subject:MIME-Version:Content-Type: Content-Transfer-Encoding:Message-Id:To:Cc:Autocrypt:OpenPGP:From; b=YrMcqWANW7Qr8b4xgY1Uxra81kGDp46M2Y8JpqxBkOjQe8YDKfV2HJW0cTDYfbxTC MBit4I5WnzQ495dT4NDq8Ab69l6cwd0zevfnbs6BfQ+7YTXcIxOdf5QvTfH6kIzKIt Nx/LYVzlLuUHmF5KbMLBynvxxtQN6VU9vA5E8wNDtBF33LuUnyUPzsdG1G6XIbT9ln sPoBCgd4BKO0C/k6kzqieWQeNHVjKatc36GKIFkC1pG3ZBcU5H7nKyQp/dagvNmywK OD0O9SVJhTeR1+bNIdGkOF/cJQNNcTPsUcsyf+6zpBGmPiYKSpw5ZZjDvnNPY+g81i T43fE2t6exGxA== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4fkLmT3Rb6z9rxK; Sun, 29 Mar 2026 19:22:33 +0200 (CEST) From: Markus Probst Date: Sun, 29 Mar 2026 17:22:35 +0000 Subject: [PATCH v13 2/3] rust: leds: add Mode trait 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: <20260329-rust_leds-v13-2-21a599c5b2d1@posteo.de> References: <20260329-rust_leds-v13-0-21a599c5b2d1@posteo.de> In-Reply-To: <20260329-rust_leds-v13-0-21a599c5b2d1@posteo.de> To: Lee Jones , Pavel Machek , Greg Kroah-Hartman , Dave Ertman , Ira Weiny , Leon Romanovsky , Miguel Ojeda , Alex Gaynor , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , "Rafael J. Wysocki" , Bjorn Helgaas , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Boqun Feng , Boqun Feng Cc: rust-for-linux@vger.kernel.org, linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Markus Probst X-Developer-Signature: v=1; a=openpgp-sha256; l=5273; i=markus.probst@posteo.de; h=from:subject:message-id; bh=zdwp4NNgFfvRIvYjtCKYF8YDPW9jE+7dJKS4sgsjRTo=; b=owEBiQJ2/ZANAwAIATR2H/jnrUPSAcsmYgBpyV/SW/+9IzfZ7Sj25PE0B3nAS+EzyQS0ONje+ RB2XQX0g3GJAk8EAAEIADkWIQSCdBjE9KxY53IwxHM0dh/4561D0gUCaclf0hsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMSwyLDIACgkQNHYf+OetQ9Jr6A//YIX42dTCw2ePYzv71h7/vrcU6PiRvvz mN28onD7Mw/CIR6D4mkvmw5mYHg6EcSN5kReWMC3VtLfmoA1s1zW53PB2aGE6UipZHMDgUpNBfa nHbhOQ8cwSGfsO2NBLNRq/Ho+3GfB89HHyAzLkdT5fULq+UmK/Q6fMNUqc71BclURxmEtytjqt8 NkTn7Y+YmEhyWoRZtVe/Ttd8WkM7if22HJ+Lm7CZ33e/+xDgOBDZ81ohHuTVkNgPvZu+AxBoq14 Vt1spQUwGPAcct+fIK2FMN1XfgtC+VgL/Guw6zer/3h99R/2mN9BjxCEXyvhwrjiW0dondpE2v4 dgiUllRAqE1SfOH9xaI/mcUYTIErnkZ9hJwY3r6HMpe3GoDbu5WgjAnw0sNrO+ljsy+K2SPxEiV gFK6ZMJa43KOxfBye7C7S/LVWE5mTRENDtsUluNj4mDiPcM6iNvynjz16X3IHU4WdIOAo3fVUc8 d3vcA2JUd5dlfhiACGJt1R3yU/g8U+y12gQkTs1lUkn5o4SPnzGKKjwLWUOvsW5BLyXnDGoHnml JcQ8xNZ1FPBIiCmMcwpmTpTO7XvR5Qksb4PpNbNb3bHLAf8jIAztKOHO58wkb8iOpXQ4WShhmmN H/xfS0v3GHeHqVHNtQyHN4qAiksOpibYelgBmZNWlFo1c+I3bJZo= X-Developer-Key: i=markus.probst@posteo.de; a=openpgp; fpr=827418C4F4AC58E77230C47334761FF8E7AD43D2 Autocrypt: addr=markus.probst@posteo.de; prefer-encrypt=mutual; keydata=xsFNBGiDvXgBEADAXUceKafpl46S35UmDh2wRvvx+UfZbcTjeQOlSwKP7YVJ4JOZrVs93qReNLkO WguIqPBxR9blQ4nyYrqSCV+MMw/3ifyXIm6Pw2YRUDg+WTEOjTixRCoWDgUj1nOsvJ9tVAm76Ww+ /pAnepVRafMID0rqEfD9oGv1YrfpeFJhyE2zUw3SyyNLIKWD6QeLRhKQRbSnsXhGLFBXCqt9k5JA RhgQof9zvztcCVlT5KVvuyfC4H+HzeGmu9201BVyihJwKdcKPq+n/aY5FUVxNTgtI9f8wIbmfAja oT1pjXSp+dszakA98fhONM98pOq723o/1ZGMZukyXFfsDGtA3BB79HoopHKujLGWAGskzClwTjRQ xBqxh/U/lL1pc+0xPWikTNCmtziCOvv0KA0arDOMQlyFvImzX6oGVgE4ksKQYbMZ3Ikw6L1Rv1J+ FvN0aNwOKgL2ztBRYscUGcQvA0Zo1fGCAn/BLEJvQYShWKeKqjyncVGoXFsz2AcuFKe1pwETSsN6 OZncjy32e4ktgs07cWBfx0v62b8md36jau+B6RVnnodaA8++oXl3FRwiEW8XfXWIjy4umIv93tb8 8ekYsfOfWkTSewZYXGoqe4RtK80ulMHb/dh2FZQIFyRdN4HOmB4FYO5sEYFr9YjHLmDkrUgNodJC XCeMe4BO4iaxUQARAQABzRdtYXJrdXMucHJvYnN0QHBvc3Rlby5kZcLBkQQTAQgAOxYhBIJ0GMT0 rFjncjDEczR2H/jnrUPSBQJog714AhsDBQsJCAcCAiICBhUKCQgLAgQWAgMBAh4HAheAAAoJEDR2 H/jnrUPSgdkQAISaTk2D345ehXEkn5z2yUEjaVjHIE7ziqRaOgn/QanCgeTUinIv6L6QXUFvvIfH 1OLPwQ1hfvEg9NnNLyFezWSy6jvoVBTIPqicD/r3FkithnQ1IDkdSjrarPMxJkvuh3l7XZHo49GV HQ8i5zh5w4YISrcEtE99lJisvni2Jqx7we5tey9voQFDyM8jxlSWv3pmoUTCtBkX/eKHJXosgsuS B4TGDCVPOjla/emI5c9MhMG7O4WEEmoSdPbmraPw66YZD6uLyhV4DPHbiDWRzXWnClHSyjB9rky9 lausFxogvu4l9H+KDsXIadNDWdLdu1/enS/wDd9zh5S78rY2jeXaG4mnf4seEKamZ7KQ6FIHrcyP ezdDzssPQcTQcGRMQzCn6wP3tlGk7rsfmyHMlFqdRoNNv+ZER/OkmZFPW655zRfbMi0vtrqK2Awm 9ggobb1oktfd9PPNXMUY+DNVlgR2G7jLnenSoQausLUm0pHoNE8TWFv851Y6SOYnvn488sP1Tki5 F3rKwclawQFHUXTCQw+QSh9ay8xgnNZfH+u9NY7w3gPoeKBOAFcBc2BtzcgekeWS8qgEmm2/oNFV G0ivPQbRx8FjRKbuF7g3YhgNZZ0ac8FneuUtJ2PkSIFTZhaAiC0utvxk0ndmWFiW4acEkMZGrLaM L2zWNjrqwsD2zsFNBGiDvXgBEADCXQy1n7wjRxG12DOVADawjghKcG+5LtEf31WftHKLFbp/HArj BhkT6mj+CCI1ClqY+FYU5CK/s0ScMfLxRGLZ0Ktzawb78vOgBVFT3yB1yWBTewsAXdqNqRooaUNo 8cG/NNJLjhccH/7PO/FWX5qftOVUJ/AIsAhKQJ18Tc8Ik73v427EDxuKb9mTAnYQFA3Ev3hAiVbO 6Rv39amVOfJ8sqwiSUGidj2Fctg2aB5JbeMln0KCUbTD1LhEFepeKypfofAXQbGwaCjAhmkWy/q3 IT1mUrPxOngbxdRoOx1tGUC0HCMUW1sFaJgQPMmDcR0JGPOpgsKnitsSnN7ShcCr1buel7vLnUMD +TAZ5opdoF6HjAvAnBQaijtK6minkrM0seNXnCg0KkV8xhMNa6zCs1rq4GgjNLJue2EmuyHooHA4 7JMoLVHcxVeuNTp6K2+XRx0Pk4e2Lj8IVy9yEYyrywEOC5XRW37KJjsiOAsumi1rkvM7QREWgUDe Xs0+RpxI3QrrANh71fLMRo7LKRF3Gvw13NVCCC9ea20P4PwhgWKStkwO2NO+YJsAoS1QycMi/vKu 0EHhknYXamaSV50oZzHKmX56vEeJHTcngrM8R1SwJCYopCx9gkz90bTVYlitJa5hloWTYeMD7FNj Y6jfVSzgM/K4gMgUNDW/PPGeMwARAQABwsF2BBgBCAAgFiEEgnQYxPSsWOdyMMRzNHYf+OetQ9IF AmiDvXgCGwwACgkQNHYf+OetQ9LHDBAAhk+ab8+WrbS/b1/gYW3q1KDiXU719nCtfkUVXKidW5Ec Idlr5HGt8ilLoxSWT2Zi368iHCXS0WenGgPwlv8ifvB7TOZiiTDZROZkXjEBmU4nYjJ7GymawpWv oQwjMsPuq6ysbzWtOZ7eILx7cI0FjQeJ/Q2baRJub0uAZNwBOxCkAS6lpk5Fntd2u8CWmDQo4SYp xeuQ+pwkp0yEP30RhN2BO2DXiBEGSZSYh+ioGbCHQPIV3iVj0h6lcCPOqopZqyeCfigeacBI0nvN jHWz/spzF3+4OS+3RJvoHtAQmProxyGib8iVsTxgZO3UUi4TSODeEt0i0kHSPY4sCciOyXfAyYoD DFqhRjOEwBBxhr+scU4C1T2AflozvDwq3VSONjrKJUkhd8+WsdXxMdPFgBQuiKKwUy11mz6KQfcR wmDehF3UaUoxa+YIhWPbKmycxuX/D8SvnqavzAeAL1OcRbEI/HsoroVlEFbBRNBZLJUlnTPs8ZcU 4+8rq5YX1GUrJL3jf6SAfSgO7UdkEET3PdcKFYtS+ruV1Cp5V0q4kCfI5jk25iiz8grM2wOzVSsc l1mEkhiEPH87HP0whhb544iioSnumd3HJKL7dzhRegsMizatupp8D65A2JziW0WKopa1iw9fti3A aBeNN4ijKZchBXHPgVx+YtWRHfcm4l8= OpenPGP: url=https://posteo.de/keys/markus.probst@posteo.de.asc; preference=encrypt Add the `led::Mode` trait to allow for other types of led class devices in `led::LedOps`. Signed-off-by: Markus Probst --- rust/kernel/led.rs | 28 ++++++++++++++++++++++++---- rust/kernel/led/normal.rs | 24 ++++++++++++++++-------- 2 files changed, 40 insertions(+), 12 deletions(-) diff --git a/rust/kernel/led.rs b/rust/kernel/led.rs index 1fba512a804c..5035563d68a3 100644 --- a/rust/kernel/led.rs +++ b/rust/kernel/led.rs @@ -35,7 +35,7 @@ =20 mod normal; =20 -pub use normal::Device; +pub use normal::{Device, Normal}; =20 /// The name of the led is determined by the driver. pub enum Named {} @@ -177,6 +177,7 @@ pub fn name(self, name: &'a CStr) -> Self { /// #[vtable] /// impl led::LedOps for MyLedOps { /// type Bus =3D platform::Device; +/// type Mode =3D led::Normal; /// const BLOCKING: bool =3D false; /// const MAX_BRIGHTNESS: u32 =3D 255; /// @@ -209,6 +210,11 @@ pub trait LedOps: Send + 'static + Sized { #[allow(private_bounds)] type Bus: AsBusDevice; =20 + /// The led mode to use. + /// + /// See [`Mode`]. + type Mode: Mode; + /// If set true, [`LedOps::brightness_set`] and [`LedOps::blink_set`] = must perform the /// operation immediately. If set false, they must not sleep. const BLOCKING: bool; @@ -221,12 +227,16 @@ pub trait LedOps: Send + 'static + Sized { fn brightness_set( &self, dev: &Self::Bus, - classdev: &Device, + classdev: &::Device, brightness: u32, ) -> Result<()>; =20 /// Gets the current brightness level. - fn brightness_get(&self, dev: &Self::Bus, classdev: &Device) -> = u32 { + fn brightness_get( + &self, + dev: &Self::Bus, + classdev: &::Device, + ) -> u32 { let _ =3D (dev, classdev); build_error!(VTABLE_DEFAULT_ERROR) } @@ -242,7 +252,7 @@ fn brightness_get(&self, dev: &Self::Bus, classdev: &De= vice) -> u32 { fn blink_set( &self, dev: &Self::Bus, - classdev: &Device, + classdev: &::Device, delay_on: &mut usize, delay_off: &mut usize, ) -> Result<()> { @@ -305,6 +315,16 @@ fn try_from(value: u32) -> core::result::Result { } } =20 +/// The led mode. +/// +/// Each led mode has its own led class device type with different capabil= ities. +/// +/// See [`Normal`]. +pub trait Mode: private::Sealed { + /// The class device for the led mode. + type Device>; +} + mod private { pub trait Sealed {} } diff --git a/rust/kernel/led/normal.rs b/rust/kernel/led/normal.rs index bd239f186c64..dda247145f25 100644 --- a/rust/kernel/led/normal.rs +++ b/rust/kernel/led/normal.rs @@ -6,11 +6,19 @@ =20 use super::*; =20 +/// The led mode for the `struct led_classdev`. Leds with this mode can on= ly have a fixed color. +pub enum Normal {} + +impl Mode for Normal { + type Device> =3D Device; +} +impl private::Sealed for Normal {} + /// The led class device representation. /// /// This structure represents the Rust abstraction for a led class device. #[pin_data(PinnedDrop)] -pub struct Device { +pub struct Device> { #[pin] ops: T, #[pin] @@ -19,7 +27,7 @@ pub struct Device { =20 impl<'a, S: DeviceBuilderState> DeviceBuilder<'a, S> { /// Registers a new [`Device`]. - pub fn build( + pub fn build>( self, parent: &'a T::Bus, ops: impl PinInit + 'a, @@ -89,7 +97,7 @@ pub fn build( } } =20 -impl Device { +impl> Device { /// # Safety /// `led_cdev` must be a valid pointer to a `led_classdev` embedded wi= thin a /// `led::Device`. @@ -107,17 +115,17 @@ fn parent(&self) -> &device::Device { } =20 // SAFETY: A `led::Device` can be unregistered from any thread. -unsafe impl Send for Device {} +unsafe impl + Send> Send for Device {} =20 // SAFETY: `led::Device` can be shared among threads because all methods o= f `led::Device` // are thread safe. -unsafe impl Sync for Device {} +unsafe impl + Sync> Sync for Device {} =20 -struct Adapter { +struct Adapter> { _p: PhantomData, } =20 -impl Adapter { +impl> Adapter { /// # Safety /// `led_cdev` must be a valid pointer to a `led_classdev` embedded wi= thin a /// `led::Device`. @@ -203,7 +211,7 @@ impl Adapter { } =20 #[pinned_drop] -impl PinnedDrop for Device { +impl> PinnedDrop for Device { fn drop(self: Pin<&mut Self>) { let raw =3D self.classdev.get(); // SAFETY: The existence of `self` guarantees that `self.classdev.= get()` is a pointer to a --=20 2.52.0