From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sender4-op-o15.zoho.com (sender4-op-o15.zoho.com [136.143.188.15]) (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 8F3BB23BD1F; Tue, 3 Jun 2025 15:06:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.188.15 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748963213; cv=pass; b=b2vPF3KzOxYTLoDCNfnppY3x7su4UdXbxPijQCuHsXQ/rpb6M7Kun1Nl8hk8KrSVy5sYUB5QHJ8G2lwZUrtYyUY0gGZQYUU11OUkrrDrdexZJhxAKScJYbiY5cByWKVnZ9iyLR3w45sa3iv15PUDue6UWn1Dr3PUKuQctypMvik= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748963213; c=relaxed/simple; bh=xkcLhcHFSZ5ve9Nj6w0b2OS9Tsm1rGLSCxt5xh3oeHY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=q4PSxaF+JJDf465Qohu6aK9bzf1qCZjAxeE81ENqYttryceno1GJFLKu13v9u+2bsh5qMuQT+YQ8M7ErPDiyLJRWb/h4qHwZUNHQu6gCC94RBOTYKEUkO0wC3zSq5+5+XBfWot7uoNQDF4EUSlxD/wttiES7Dr3hXp4xPkf9zRA= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (1024-bit key) header.d=collabora.com header.i=daniel.almeida@collabora.com header.b=UwANQ2sh; arc=pass smtp.client-ip=136.143.188.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=collabora.com header.i=daniel.almeida@collabora.com header.b="UwANQ2sh" ARC-Seal: i=1; a=rsa-sha256; t=1748963186; cv=none; d=zohomail.com; s=zohoarc; b=co8iSyHBdtN+tA6LhOtpNBEArKwlkQmGeDMkYu+a1xrMGR8DSbTOabs7b7GngUrWqv8njeKQcdIokMPysv4j3TkRFjVlvvrfXQhGzMO35/ZWoXLx/2AbLolfaIb32br4w/XpVn6FYViHHaGRMKli17hzAMGSRRhfH2THsTugkc8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1748963186; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:Subject:To:To:Message-Id:Reply-To; bh=jZffzdn2W8kvxTQetg+C03AnS6TS/ju5MbP+AN840e0=; b=G+lmx8kZ+NXlxkwyDngeqNnRmx1nMdQrj6eJNWCTyQW2AGk8DugkyEa0fMZSs6K4K8mJJfpRdsPnGYvUccN+jL3SdglcDM/CkZJAFJQPluvJIaeAGuLXht/dAomltTbtXotAVm+WDMbZU9Eg1LXJh7iAz8Gcy5vWcej5rs5CVU8= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=daniel.almeida@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1748963186; s=zohomail; d=collabora.com; i=daniel.almeida@collabora.com; h=From:From:Date:Date:Subject:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:Message-Id:References:In-Reply-To:To:To:Cc:Cc:Reply-To; bh=jZffzdn2W8kvxTQetg+C03AnS6TS/ju5MbP+AN840e0=; b=UwANQ2sh83ITkPcY/9YDgYC1uoQN4oV/5G5LpQgnzvW3KzGurQ6qvWHsHt4MkqTO V1AidFVv43I7gatr78BFpyn7dNtr8NqTDSKOWUuGZJlQKwuvO4hipTZ9cHL9+gqJH+G Cga4lNBbuJp+V7zY7n3qlDDRBEseX2OFcmjk/U3g= Received: by mx.zohomail.com with SMTPS id 1748963185327416.87391942151964; Tue, 3 Jun 2025 08:06:25 -0700 (PDT) From: Daniel Almeida Date: Tue, 03 Jun 2025 12:05:29 -0300 Subject: [PATCH v9 3/4] rust: platform: add resource accessors Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250603-topics-tyr-platform_iomem-v9-3-a27e04157e3e@collabora.com> References: <20250603-topics-tyr-platform_iomem-v9-0-a27e04157e3e@collabora.com> In-Reply-To: <20250603-topics-tyr-platform_iomem-v9-0-a27e04157e3e@collabora.com> To: Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Greg Kroah-Hartman , "Rafael J. Wysocki" , Andrew Morton , Andy Shevchenko , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Bjorn Helgaas , Mika Westerberg , Ying Huang Cc: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, Daniel Almeida X-Mailer: b4 0.14.2 X-ZohoMailClient: External A previous patch has exposed the abstractions struct resource. Now make it possible to retrieve retrieve resources from platform devices in Rust using either a name or an index. Signed-off-by: Daniel Almeida --- rust/kernel/platform.rs | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/rust/kernel/platform.rs b/rust/kernel/platform.rs index 08849d92c07418d6390803bb8cc51516368bca84..427bc706f4349083b6bab81a02cb8ed803903590 100644 --- a/rust/kernel/platform.rs +++ b/rust/kernel/platform.rs @@ -7,6 +7,7 @@ use crate::{ bindings, container_of, device, driver, error::{to_result, Result}, + io::resource::Resource, of, prelude::*, str::CStr, @@ -187,6 +188,43 @@ impl Device { fn as_raw(&self) -> *mut bindings::platform_device { self.0.get() } + + /// Returns the resource at `index`, if any. + pub fn resource_by_index(&self, index: u32) -> Option<&Resource> { + // SAFETY: `self.as_raw()` returns a valid pointer to a `struct platform_device`. + let resource = unsafe { + bindings::platform_get_resource(self.as_raw(), bindings::IORESOURCE_MEM, index) + }; + + if resource.is_null() { + return None; + } + + // SAFETY: `resource` is a valid pointer to a `struct resource` as + // returned by `platform_get_resource`. + Some(unsafe { Resource::as_ref(resource) }) + } + + /// Returns the resource with a given `name`, if any. + pub fn resource_by_name(&self, name: &CStr) -> Option<&Resource> { + // SAFETY: `self.as_raw()` returns a valid pointer to a `struct + // platform_device` and `name` points to a valid C string. + let resource = unsafe { + bindings::platform_get_resource_byname( + self.as_raw(), + bindings::IORESOURCE_MEM, + name.as_char_ptr(), + ) + }; + + if resource.is_null() { + return None; + } + + // SAFETY: `resource` is a valid pointer to a `struct resource` as + // returned by `platform_get_resource`. + Some(unsafe { Resource::as_ref(resource) }) + } } // SAFETY: `Device` is a transparent wrapper of a type that doesn't depend on `Device`'s generic -- 2.49.0