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Fri, 31 Jan 2025 02:19:31 -0800 (PST) Message-ID: <4518f68e-c6cb-4c97-957e-b8988e2b309b@sedlak.dev> Date: Fri, 31 Jan 2025 11:19:30 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 3/3] rust: platform: allow ioremap of platform resources To: Daniel Almeida , ojeda@kernel.org, alex.gaynor@gmail.com, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.mco, benno.lossin@proton.me, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, gregkh@linuxfoundation.org, rafael@kernel.org, dakr@kernel.org, boris.brezillon@collabora.com, robh@kernel.org Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250130220529.665896-1-daniel.almeida@collabora.com> <20250130220529.665896-4-daniel.almeida@collabora.com> Content-Language: en-US From: Daniel Sedlak In-Reply-To: <20250130220529.665896-4-daniel.almeida@collabora.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi, On 1/30/25 11:05 PM, Daniel Almeida wrote: > + > + /// Same as [`Self::ioremap_resource`] but with exclusive access to the underlying > + /// region. > + pub fn ioremap_resource_exclusive( > + &self, > + resource: &Resource, > + ) -> Result>> { > + self.ioremap_resource_exclusive_sized::<0>(resource) > + } > + > + /// Returns the resource at `index`, if any. > + pub fn resource(&self, index: u32) -> Option<&Resource> { Maybe we could utilize the Index [1] trait to make the API more rust~ish? Or at least name it `resource_by_index` to keep consistency with `resource_by_name`? Link: https://doc.rust-lang.org/core/ops/trait.Index.html [1] > + // 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::from_ptr(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::from_ptr(resource) }) > + } > } > > impl AsRef for Device { Daniel