From 8238a788ac34d2fc3ba8feaab55212736a438d34 Mon Sep 17 00:00:00 2001
From: gaoyang3513 <gaoyang3513@163.com>
Date: Tue, 16 Jan 2024 23:33:24 +0800
Subject: [PATCH] [Add] Char driver register nanually

---
 01-Char/Char_Manual/Makefile      | 21 ++++++++++++++++
 01-Char/Char_Manual/char_manual.c | 42 +++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 01-Char/Char_Manual/Makefile
 create mode 100644 01-Char/Char_Manual/char_manual.c

diff --git a/01-Char/Char_Manual/Makefile b/01-Char/Char_Manual/Makefile
new file mode 100644
index 000000000..3cd9b5e97
--- /dev/null
+++ b/01-Char/Char_Manual/Makefile
@@ -0,0 +1,21 @@
+ifeq ($(KERNELRELEASE),)
+
+ifeq ($(ARCH),arm)
+KERNELDIR ?= /home/farsight/fs4412/linux-3.14.25-fs4412
+ROOTFS ?= /nfs/rootfs
+else
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+endif
+PWD := $(shell pwd)
+
+modules:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
+modules_install:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) INSTALL_MOD_PATH=$(ROOTFS) modules_install
+clean:
+	rm -rf *.o *.ko .*.cmd *.mod.* modules.order Module.symvers .tmp_versions
+else
+
+obj-m := char_manual.o
+
+endif
diff --git a/01-Char/Char_Manual/char_manual.c b/01-Char/Char_Manual/char_manual.c
new file mode 100644
index 000000000..85166d7f8
--- /dev/null
+++ b/01-Char/Char_Manual/char_manual.c
@@ -0,0 +1,42 @@
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <linux/fs.h>
+
+#define VSER_MAJOR	256
+#define VSER_MINOR	0
+#define VSER_DEV_CNT	1
+#define VSER_DEV_NAME	"vser"
+
+static int __init vser_init(void)
+{
+	int ret;
+	dev_t dev;
+
+	dev = MKDEV(VSER_MAJOR, VSER_MINOR);
+	ret = register_chrdev_region(dev, VSER_DEV_CNT, VSER_DEV_NAME);
+	if (ret)
+		goto reg_err;
+	return 0;
+
+reg_err:
+	return ret;
+}
+
+static void __exit vser_exit(void)
+{
+
+	dev_t dev;
+
+	dev = MKDEV(VSER_MAJOR, VSER_MINOR);
+	unregister_chrdev_region(dev, VSER_DEV_CNT);
+}
+
+module_init(vser_init);
+module_exit(vser_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kevin Jiang <jiangxg@farsight.com.cn>");
+MODULE_DESCRIPTION("A simple character device driver");
+MODULE_ALIAS("virtual-serial");