增加 misc driver demo.

Signed-off-by: ithink.chan <chenyang@autoai.com>

.gitignore

@@ -91,7 +91,6 @@ CMakeCache.txt
 CMakeFiles
 CMakeScripts
 Testing
-Makefile
 cmake_install.cmake
 install_manifest.txt
 compile_commands.json
@@ -233,7 +232,6 @@ qrc_*.cpp
 ui_*.h
 *.qmlc
 *.jsc
-Makefile*
 *build-*
 
 # Qt unit tests
@@ -573,7 +571,6 @@ inc/
 /blib/
 /_eumm/
 /*.gz
-/Makefile
 /Makefile.old
 /MANIFEST.bak
 /pm_to_blib

Linux/KernelDriver/Misc/Makefile

@@ -0,0 +1,14 @@
+obj-m:= \
+    demomisc.o
+
+demomisc-objs:= \
+	demo_misc.o
+
+EXTRA_CFLAGS += \
+    -I$(PWD)
+
+all:
+	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+
+clean:
+	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

Linux/KernelDriver/Misc/demo_misc.c

@@ -0,0 +1,126 @@
+/**
+ * @file    demo_misc.c
+ * @author  Rick Chan (cy187lion@sina.com)
+ * @brief   Linux misc driver demo.
+ * @version 0.1
+ * @date    2019-10-15
+ * 
+ * @copyright Copyright (c) 2019
+ * 
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/miscdevice.h>
+#include <linux/uaccess.h>
+
+MODULE_AUTHOR("Rick Chan");
+MODULE_LICENSE("GPL");
+
+#define IOCTL_IOC_SIZE 8
+#define IOCTL_IOC   _IOC(_IOC_READ|_IOC_WRITE, 0, 0, IOCTL_IOC_SIZE)
+#define IOCTL_IO    _IO(0, 1)
+#define IOCTL_IOR   _IOR(0, 2, uint16_t)
+#define IOCTL_IOW   _IOW(0, 3, int32_t)
+#define IOCTL_IOWR  _IOWR(0, 4, uint32_t)
+
+static int demo_open(struct inode *inode, struct file* filp)
+{
+    return 0;
+}
+
+static int demo_release(struct inode *inode, struct file* filp)
+{
+    return 0;
+}
+
+static loff_t demo_llseek(struct file *filp, loff_t offset, int origin)
+{
+    return filp->f_pos;
+}
+
+static ssize_t demo_read(struct file *filp, char __user *buffer, size_t count, loff_t *offset)
+{
+    const char __user *p = buffer;
+    return p-buffer;
+}
+
+static ssize_t demo_write(struct file *filp, const char __user *buffer, size_t count, loff_t *offset)
+{
+    const char __user *p = buffer;
+    return p-buffer;
+}
+
+static long demo_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+    switch(cmd)
+    {
+    case IOCTL_IOC:
+    {
+        uint8_t tmp[IOCTL_IOC_SIZE];
+        copy_from_user(&tmp, (void*)arg, _IOC_SIZE(cmd));
+        copy_to_user((void*)arg, &tmp, _IOC_SIZE(cmd));
+    }
+        break;
+    case IOCTL_IO:
+        break;
+    case IOCTL_IOR:
+    {
+        uint16_t tmp = 0x55AA;
+        copy_to_user((void*)arg, &tmp, _IOC_SIZE(cmd));
+    }
+        break;
+    case IOCTL_IOW:
+    {
+        int32_t tmp = 0;
+        copy_from_user(&tmp, (void*)arg, _IOC_SIZE(cmd));
+    }
+        break;
+    case IOCTL_IOWR:
+    {
+        uint32_t tmp = 0;
+        copy_from_user(&tmp, (void*)arg, _IOC_SIZE(cmd));
+        copy_to_user((void*)arg, &tmp, _IOC_SIZE(cmd));
+    }
+        break;
+    default:
+        return -ENOIOCTLCMD;
+    }
+    return 0;
+}
+
+static int demo_mmap(struct file* filp, struct vm_area_struct* vma)
+{
+    return 0;
+}
+
+static struct file_operations demo_fops = {
+    .owner          = THIS_MODULE,
+    .open           = demo_open,
+    .release        = demo_release,
+    .llseek         = demo_llseek,
+    .read           = demo_read,
+    .write          = demo_write,
+    .unlocked_ioctl = demo_ioctl,
+    .mmap           = demo_mmap
+};
+
+static struct miscdevice demo_dev = {
+    .minor  = MISC_DYNAMIC_MINOR,   // Dynamically allocate minor.
+    .name   = "demo_misc",
+    .fops   = &demo_fops,
+};
+
+static int __init demo_init(void)
+{
+    misc_register(&demo_dev);
+    return 0;
+}
+
+static void __exit demo_exit(void)
+{
+    misc_deregister(&demo_dev);
+}
+
+module_init(demo_init);
+module_exit(demo_exit);