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Demo 程序统一到 DemoPublic 仓库中. 

Signed-off-by: ithink.chan <chenyang@autoai.com>
This commit is contained in:
ithink.chan 2020-04-08 17:03:38 +08:00
parent f678d4abef
commit ad2a85c40c
2 changed files with 0 additions and 140 deletions
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14
Software/Development/OperatingSystem/Linux/KernelDriver/Demo/Misc/Makefile
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@ -1,14 +0,0 @@
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

126
Software/Development/OperatingSystem/Linux/KernelDriver/Demo/Misc/demo_misc.c
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@ -1,126 +0,0 @@
/**
* @file demo_misc.c
* @author your name (you@domain.com)
* @brief
* @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);