[PATCH v3 3/3] samples: rust: add SPI driver sample

[Shuai Liu <847807867@qq.com>]

Add a sample driver for the Rust SPI abstractions to demonstrate their
usage.

Signed-off-by: Shuai Liu <847807867@qq.com>
---
 samples/rust/Kconfig            | 11 ++++++
 samples/rust/Makefile           |  1 +
 samples/rust/rust_driver_spi.rs | 66 +++++++++++++++++++++++++++++++++
 3 files changed, 78 insertions(+)
 create mode 100644 samples/rust/rust_driver_spi.rs

diff --git a/samples/rust/Kconfig b/samples/rust/Kconfig
index 31d62533ef25..f99bf52654a1 100644
--- a/samples/rust/Kconfig
+++ b/samples/rust/Kconfig
@@ -84,6 +84,17 @@ config SAMPLE_RUST_DEBUGFS_SCOPED
 
 	  If unsure, say N.
 
+config SAMPLE_RUST_DRIVER_SPI
+	tristate "SPI Driver"
+	depends on SPI=y
+	help
+	  This option builds the Rust SPI driver sample.
+
+	  To compile this as a module, choose M here:
+	  the module will be called rust_driver_spi.
+
+	  If unsure, say N.
+
 config SAMPLE_RUST_DRIVER_I2C
 	tristate "I2C Driver"
 	depends on I2C=y
diff --git a/samples/rust/Makefile b/samples/rust/Makefile
index b986b681cde5..efe04638a990 100644
--- a/samples/rust/Makefile
+++ b/samples/rust/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_SAMPLE_RUST_DEBUGFS)		+= rust_debugfs.o
 obj-$(CONFIG_SAMPLE_RUST_DEBUGFS_SCOPED)	+= rust_debugfs_scoped.o
 obj-$(CONFIG_SAMPLE_RUST_DMA)			+= rust_dma.o
 obj-$(CONFIG_SAMPLE_RUST_DRIVER_I2C)		+= rust_driver_i2c.o
+obj-$(CONFIG_SAMPLE_RUST_DRIVER_SPI)		+= rust_driver_spi.o
 obj-$(CONFIG_SAMPLE_RUST_I2C_CLIENT)		+= rust_i2c_client.o
 obj-$(CONFIG_SAMPLE_RUST_DRIVER_PCI)		+= rust_driver_pci.o
 obj-$(CONFIG_SAMPLE_RUST_DRIVER_PLATFORM)	+= rust_driver_platform.o
diff --git a/samples/rust/rust_driver_spi.rs b/samples/rust/rust_driver_spi.rs
new file mode 100644
index 000000000000..7eee7b735794
--- /dev/null
+++ b/samples/rust/rust_driver_spi.rs
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Rust SPI driver sample.
+
+use kernel::{
+    device::Core,
+    of,
+    prelude::*,
+    spi, //
+};
+
+struct SampleDriver;
+
+kernel::spi_device_table! {
+    SPI_TABLE,
+    <SampleDriver as spi::Driver>::IdInfo,
+    [(spi::DeviceId::new(c"rust_driver_spi"), 0)]
+}
+
+kernel::of_device_table! {
+    OF_TABLE,
+    <SampleDriver as spi::Driver>::IdInfo,
+    [(of::DeviceId::new(c"test,rust_driver_spi"), 0)]
+}
+
+impl spi::Driver for SampleDriver {
+    type IdInfo = u32;
+    type Data<'bound> = Self;
+
+    const SPI_ID_TABLE: Option<spi::IdTable<Self::IdInfo>> = Some(&SPI_TABLE);
+    const OF_ID_TABLE: Option<of::IdTable<Self::IdInfo>> = Some(&OF_TABLE);
+
+    fn probe<'bound>(
+        sdev: &'bound spi::SpiDevice<Core<'_>>,
+        info: Option<&'bound Self::IdInfo>,
+    ) -> impl PinInit<Self, Error> + 'bound {
+        let dev = sdev.as_ref();
+
+        dev_info!(dev, "Probe Rust SPI driver sample.\n");
+        dev_info!(dev, "max_speed_hz: {}.\n", sdev.max_speed_hz());
+        dev_info!(dev, "bits_per_word: {}.\n", sdev.bits_per_word());
+        dev_info!(dev, "mode: {:#x}.\n", sdev.mode());
+
+        if let Some(info) = info {
+            dev_info!(dev, "Probed with info: '{}'.\n", info);
+        }
+
+        Ok(Self)
+    }
+
+    fn shutdown<'bound>(sdev: &'bound spi::SpiDevice<Core<'_>>, _this: Pin<&Self>) {
+        dev_info!(sdev.as_ref(), "Shutdown Rust SPI driver sample.\n");
+    }
+
+    fn unbind<'bound>(sdev: &'bound spi::SpiDevice<Core<'_>>, _this: Pin<&Self>) {
+        dev_info!(sdev.as_ref(), "Unbind Rust SPI driver sample.\n");
+    }
+}
+
+kernel::module_spi_driver! {
+    type: SampleDriver,
+    name: "rust_driver_spi",
+    authors: ["Shuai Liu"],
+    description: "Rust SPI driver",
+    license: "GPL v2",
+}
-- 
2.43.0