boards: components: Initial support for the Atecc508a CryptoAuthentic…

…ation Device

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

boards/components/src/atecc508a.rs

@@ -0,0 +1,69 @@
+// Licensed under the Apache License, Version 2.0 or the MIT License.
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+// Copyright Tock Contributors 2022.
+
+//! Components for the ATECC508A CryptoAuthentication Device.
+//!
+//! Usage
+//! -----
+//! ```rust
+//!     let atecc508a =
+//!         Atecc508aComponent::new(mux_i2c, 0x60).finalize(components::atecc508a_component_static!());
+//! ```
+
+use capsules_core::virtualizers::virtual_i2c::{I2CDevice, MuxI2C};
+use capsules_extra::atecc508a::Atecc508a;
+use core::mem::MaybeUninit;
+use kernel::component::Component;
+use kernel::hil::i2c;
+
+// Setup static space for the objects.
+#[macro_export]
+macro_rules! atecc508a_component_static {
+    ($I:ty $(,)?) => {{
+        let i2c_device =
+            kernel::static_buf!(capsules_core::virtualizers::virtual_i2c::I2CDevice<'static, $I>);
+        let i2c_buffer = kernel::static_buf!([u8; 40]);
+        let entropy_buffer = kernel::static_buf!([u8; 32]);
+        let atecc508a = kernel::static_buf!(capsules_extra::atecc508a::Atecc508a<'static>);
+
+        (i2c_device, i2c_buffer, entropy_buffer, atecc508a)
+    };};
+}
+
+pub struct Atecc508aComponent<I: 'static + i2c::I2CMaster<'static>> {
+    i2c_mux: &'static MuxI2C<'static, I>,
+    i2c_address: u8,
+}
+
+impl<I: 'static + i2c::I2CMaster<'static>> Atecc508aComponent<I> {
+    pub fn new(i2c: &'static MuxI2C<'static, I>, i2c_address: u8) -> Self {
+        Atecc508aComponent {
+            i2c_mux: i2c,
+            i2c_address: i2c_address,
+        }
+    }
+}
+
+impl<I: 'static + i2c::I2CMaster<'static>> Component for Atecc508aComponent<I> {
+    type StaticInput = (
+        &'static mut MaybeUninit<I2CDevice<'static, I>>,
+        &'static mut MaybeUninit<[u8; 40]>,
+        &'static mut MaybeUninit<[u8; 32]>,
+        &'static mut MaybeUninit<Atecc508a<'static>>,
+    );
+    type Output = &'static Atecc508a<'static>;
+
+    fn finalize(self, s: Self::StaticInput) -> Self::Output {
+        let atecc508a_i2c = s.0.write(I2CDevice::new(self.i2c_mux, self.i2c_address));
+
+        let i2c_buffer = s.1.write([0; 40]);
+        let entropy_buffer = s.2.write([0; 32]);
+
+        let atecc508a =
+            s.3.write(Atecc508a::new(atecc508a_i2c, i2c_buffer, entropy_buffer));
+
+        atecc508a_i2c.set_client(atecc508a);
+        atecc508a
+    }
+}

boards/components/src/lib.rs

@@ -12,6 +12,7 @@ pub mod alarm;
 pub mod analog_comparator;
 pub mod apds9960;
 pub mod app_flash_driver;
+pub mod atecc508a;
 pub mod ble;
 pub mod bme280;
 pub mod bmp280;