initial build for create device node

.vscode/c_cpp_properties.json

@@ -0,0 +1,27 @@
+{
+  "env": {
+    "KERNEL_VERSION":"6.10.4-200.fc40.x86_64"
+  },
+  "configurations": [
+    {
+      "name": "Linux",
+      "includePath": [
+        "${workspaceFolder}/**",
+        "/lib/modules/${KERNEL_VERSION}/build/include/",
+        "/lib/modules/${KERNEL_VERSION}/build/arch/x86/include/",
+        "/lib/modules/${KERNEL_VERSION}/build/arch/x86/include/generated"
+      ],
+      "defines": [
+          "__GNUC__",
+          "__KERNEL__",
+          "MODULE",
+          "KBUILD_MODNAME=\"UniversalIO\""
+      ],
+      "compilerPath": "/usr/bin/gcc",
+      "cStandard": "c11",
+      "cppStandard": "c++17",
+      "intelliSenseMode": "linux-gcc-x64"
+    }
+  ],
+  "version": 4
+}

.vscode/settings.json

@@ -0,0 +1,19 @@
+{
+    "files.associations": {
+        "kernel.h": "c",
+        "slab.h": "c",
+        "i2c.h": "c",
+        "i2c_engine.h": "c",
+        "module.h": "c",
+        "spi_engine.h": "c",
+        "spi.h": "c",
+        "i2c-smbus.h": "c",
+        "i2c-dev.h": "c",
+        "compiler.h": "c",
+        "input.h": "c",
+        "init.h": "c",
+        "lib.h": "c",
+        "uart_engine.h": "c"
+    },
+    "C_Cpp.clang_format_style": "{ BasedOnStyle: Google, UseTab: Always, IndentWidth: 4, TabWidth: 4, BreakBeforeBraces: Linux, AllowShortIfStatementsOnASingleLine: true, IndentCaseLabels: false, ColumnLimit: 120}"
+}

driver/linux/.gitignore

@@ -0,0 +1,12 @@
+# Binaries and objects generated from goodbye.c
+*.cmd
+*.ko
+*.mod.c
+*.o
+*.mod
+Module.symvers
+modules.order
+.tmp_versions/
+
+# Babel artifacts
+babel_client

driver/linux/Makefile

@@ -0,0 +1,25 @@
+obj-m += UniversalIO.o
+UniversalIO-objs += ./src/main.o ./src/i2c_engine.o ./src/spi_engine.o ./src/uart_engine.o
+CONFIG_MODULE_SIG=n
+EXTRA_CFLAGS := -I$(src)/include
+I2C_BUS = 4
+
+reload: build
+	@-sudo rmmod UniversalIO.ko
+	@sudo insmod UniversalIO.ko
+	@sudo dmesg | grep "UniversalIO" | tail -n 5
+
+build:
+	@make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+
+clean:
+	@make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
+
+sendTest:
+	sudo i2ctransfer -y $(I2C_BUS) w6500@0x50 0x64-
+
+style:
+	@/lib/modules/$(shell uname -r)/build/scripts/checkpatch.pl -q --no-tree -f src/*.c include/*.h
+
+dmesg:
+	@sudo dmesg

driver/linux/include/i2c_engine.h

@@ -0,0 +1,6 @@
+/* SPDX-License-Identifier: <SPDX License Expression> */
+#pragma once
+#include "lib.h"
+#include <linux/i2c.h>
+extern struct i2c_algorithm algo;
+extern struct i2c_adapter adapter;

driver/linux/include/lib.h

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: <SPDX License Expression> */
+#pragma once
+#include <linux/module.h>
+
+#ifdef pr_fmt
+#undef pr_fmt
+#endif
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

driver/linux/include/spi_engine.h

@@ -0,0 +1,4 @@
+/* SPDX-License-Identifier: <SPDX License Expression> */
+#pragma once
+#include "lib.h"
+#include <linux/spi/spi.h>

driver/linux/include/uart_engine.h

@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: <SPDX License Expression> */
+#pragma once
+#include "lib.h"

driver/linux/src/i2c_engine.c

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "i2c_engine.h"
+// static int i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
+// static u32 i2c_func(struct i2c_adapter *adap);
+
+static int i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
+{
+	pr_info("[i2c-%d] xfer!\n", adap->nr);
+	pr_info("[i2c-%d] xfer num %d!\n", adap->nr, num);
+	pr_info("[i2c-%d] xfer len %d!\n", adap->nr, msgs->len);
+	// int len = msgs->len;
+	return 1;
+}
+
+static u32 i2c_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL_ALL;
+}
+
+struct i2c_algorithm algo = {
+	.functionality = i2c_func,
+	.master_xfer = i2c_xfer,
+	.smbus_xfer = NULL};
+
+struct i2c_adapter adapter = {
+	.class = I2C_CLASS_HWMON,
+	.owner = THIS_MODULE,
+	.algo = &algo};

driver/linux/src/main.c

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "lib.h"
+#include "i2c_engine.h"
+#include "spi_engine.h"
+#include "uart_engine.h"
+
+static int __init my_i2c_init(void)
+{
+	snprintf(adapter.name, sizeof(adapter.name), "My I2C Adapter");
+
+	if (i2c_add_adapter(&adapter)) {
+		// i2c_put_adapter(&adapter);
+		return -ENODEV;
+	}
+	pr_info("hello i2c-%d!\n", adapter.nr);
+
+	return 0;
+}
+
+static void __exit my_i2c_exit(void)
+{
+	pr_info("goodbye i2c-%d!\n", adapter.nr);
+	i2c_del_adapter(&adapter);
+}
+
+module_init(my_i2c_init);
+module_exit(my_i2c_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Author");
+MODULE_DESCRIPTION("A simple I2C adapter driver");

driver/linux/src/spi_engine.c

@@ -0,0 +1,2 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "spi_engine.h"

driver/linux/src/uart_engine.c

@@ -0,0 +1,2 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "uart_engine.h"