From patchwork Wed Mar 26 17:13:47 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Remo Senekowitsch X-Patchwork-Id: 14030377 Received: from mout-p-202.mailbox.org (mout-p-202.mailbox.org [80.241.56.172]) (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 E73F61E1E15; Wed, 26 Mar 2025 17:15:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743009321; cv=none; b=KjUybphXQHWGQrZyw5PFoWt/E4TF1CHcPVGhrHYb1aqN+ZZx0jsWYNaZbVi5kMqOFB97FJoFugPT/sSmDJqyOCkgdG8yex5ueD6FMZlNHZcNPiwc/QZnIPHsIxAQvCFkXczi4iFV3enqPysePlVbHN98WyGbt0W+YkOi+sZYeYM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743009321; c=relaxed/simple; bh=aIm/JGb5KR23/j5XE+CLIq3kVoApEZuw53qSIlgtvmY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sa0F6JLG6tagPiyBtXEdYQmhzW/whm0B5G/me54fuwvW9ipzAg16V44gZW82gJXndhbNR/sP3vSCzjTv1ISlyj/cXFifCY9ptVPkSD0twJ7DJr9yl7iaeOo8oEoA30ZUBiy4IOKIAtoLZ+ib5fD2h7n57y9/ZGidIgFMwXF1V6Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=buenzli.dev; spf=pass smtp.mailfrom=buenzli.dev; arc=none smtp.client-ip=80.241.56.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=buenzli.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=buenzli.dev Received: from smtp2.mailbox.org (smtp2.mailbox.org [10.196.197.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-202.mailbox.org (Postfix) with ESMTPS id 4ZND1p2XCfz9ssD; Wed, 26 Mar 2025 18:15:10 +0100 (CET) From: Remo Senekowitsch To: Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Rob Herring Cc: Dirk Behme , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Saravana Kannan , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Remo Senekowitsch , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, devicetree@vger.kernel.org, rust-for-linux@vger.kernel.org Subject: [PATCH 08/10] rust: property: Add property_get_reference_args Date: Wed, 26 Mar 2025 18:13:47 +0100 Message-ID: <20250326171411.590681-9-remo@buenzli.dev> In-Reply-To: <20250326171411.590681-1-remo@buenzli.dev> References: <20250326171411.590681-1-remo@buenzli.dev> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Signed-off-by: Remo Senekowitsch --- rust/kernel/property.rs | 63 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) diff --git a/rust/kernel/property.rs b/rust/kernel/property.rs index dc927ad93..f1d0a33ba 100644 --- a/rust/kernel/property.rs +++ b/rust/kernel/property.rs @@ -8,6 +8,7 @@ use crate::{ alloc::KVec, + arrayvec::ArrayVec, bindings, device::Device, error::{to_result, Result}, @@ -64,6 +65,20 @@ pub fn get_child_by_name(&self, name: &CStr) -> Option> { pub fn children<'a>(&'a self) -> impl Iterator> + 'a { self.fwnode().children() } + + /// Finds a reference with arguments. + pub fn property_get_reference_args( + &self, + prop: &CStr, + nargs: NArgs<'_>, + index: u32, + ) -> Result<( + ARef, + ArrayVec<{ bindings::NR_FWNODE_REFERENCE_ARGS as usize }, u64>, + )> { + self.fwnode() + .property_get_reference_args(prop, nargs, index) + } } /// A reference-counted fwnode_handle. @@ -226,6 +241,45 @@ pub fn children<'a>(&'a self) -> impl Iterator> + 'a { Some(next) }) } + + /// Finds a reference with arguments. + pub fn property_get_reference_args( + &self, + prop: &CStr, + nargs: NArgs<'_>, + index: u32, + ) -> Result<( + ARef, + ArrayVec<{ bindings::NR_FWNODE_REFERENCE_ARGS as usize }, u64>, + )> { + let mut out_args = bindings::fwnode_reference_args::default(); + + let (nargs_prop, nargs) = match nargs { + NArgs::Prop(nargs_prop) => (nargs_prop.as_char_ptr(), 0), + NArgs::N(nargs) => (ptr::null(), nargs), + }; + + let ret = unsafe { + bindings::fwnode_property_get_reference_args( + self.0.get(), + prop.as_char_ptr(), + nargs_prop, + nargs, + index, + &mut out_args, + ) + }; + to_result(ret)?; + + let node = unsafe { FwNode::from_raw(out_args.fwnode) }; + let mut args = ArrayVec::default(); + + for i in 0..out_args.nargs { + args.push(out_args.args[i as usize]); + } + + Ok((node, args)) + } } // SAFETY: Instances of `FwNode` are always reference-counted. @@ -302,3 +356,12 @@ fn read(fwnode: &FwNode, name: &CStr) -> Result { Ok(val[0]) } } + +/// The number of arguments of a reference. +pub enum NArgs<'a> { + /// The name of the property of the reference indicating the number of + /// arguments. + Prop(&'a CStr), + /// The known number of arguments. + N(u32), +}