1、提示：错误： 初始值设定项里有未知的字段‘ioctl’
2.6以后的内核中file_operation结构体已经删除了ioctl函数，取代的是：
long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1 struct file_operations { 2 struct module *owner; 3 loff_t (*llseek) (struct file *, loff_t, int); 4 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); 5 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); 6 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); 7 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); 8 int (*readdir) (struct file *, void *, filldir_t); 9 unsigned int (*poll) (struct file *, struct poll_table_struct *); 10 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); 11 long (*compat_ioctl) (struct file *, unsigned int, unsigned long); 12 int (*mmap) (struct file *, struct vm_area_struct *); 13 int (*open) (struct inode *, struct file *); 14 int (*flush) (struct file *, fl_owner_t id); 15 int (*release) (struct inode *, struct file *); 16 int (*fsync) (struct file *, loff_t, loff_t, int datasync); 17 int (*aio_fsync) (struct kiocb *, int datasync); 18 int (*fasync) (int, struct file *, int); 19 int (*lock) (struct file *, int, struct file_lock *); 20 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); 21 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); 22 int (*check_flags)(int); 23 int (*flock) (struct file *, int, struct file_lock *); 24 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); 25 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); 26 int (*setlease)(struct file *, long, struct file_lock **); 27 long (*fallocate)(struct file *file, int mode, loff_t offset, 28 loff_t len); 29 int (*show_fdinfo)(struct seq_file *m, struct file *f); 30 };
1 struct file_operations { 2 struct module *owner; 3 loff_t (*llseek) (struct file *, loff_t, int); 4 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); 5 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); 6 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); 7 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); 8 int (*readdir) (struct file *, void *, filldir_t); 9 unsigned int (*poll) (struct file *, struct poll_table_struct *); 10 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); 11 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); 12 long (*compat_ioctl) (struct file *, unsigned int, unsigned long); 13 int (*mmap) (struct file *, struct vm_area_struct *); 14 int (*open) (struct inode *, struct file *); 15 int (*flush) (struct file *, fl_owner_t id); 16 int (*release) (struct inode *, struct file *); 17 int (*fsync) (struct file *, struct dentry *, int datasync); 18 int (*aio_fsync) (struct kiocb *, int datasync); 19 int (*fasync) (int, struct file *, int); 20 int (*lock) (struct file *, int, struct file_lock *); 21 ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *); 22 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); 23 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); 24 int (*check_flags)(int); 25 int (*dir_notify)(struct file *filp, unsigned long arg); 26 int (*flock) (struct file *, int, struct file_lock *); 27 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); 28 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); 29 };
在file_operation 赋值处修改：
.unlocked_ioctl = xxx_ioctl
此处需注意ioctl与unlocked_ioctl函数原型的差异，否则会造成传入的cmd改变。
2、调试用到的Makefile
1 #KEVERS = $(shell uname -r) 2 3 #kernel path 配置过的 4 KEVERS := /home/liupf/work/linux-3.10.x 5 INCS := -I$(KEVERS) 6 #Kernel modules 7 obj-m += memdev.o 8 9 #EXTRA_CFAGS=-g -O0 10 11 kernel_modules: 12 make -C $(KEVERS) M=$(CURDIR) modules 13 14 test: 15 #arm-linux-gcc -O2 test_can.c -o test_can 16 #Ubuntu kernel is 3.13 $(INCS) 17 arm-none-linux-gnueabi-gcc app-ioctl.c -o ioctl.out 18 clean: 19 make -C $(KEVERS) M=$(CURDIR) clean
3、调试用的脚本
1 #install.sh 2 rm -f /dev/memdev0 3 rmmod memdev.ko 4 insmod memdev.ko 5 mknod /dev/memdev0 c 251 0
网上找的版本，待修改，不能直接用
1 #!/bin/sh 2 # install_mod.sh 3 module="memdev" 4 device="memdev" 5 mode="664" 6 7 # Group: since distributions do it differently, look for wheel or use staff 8 if grep '^staff:' /etc/group > /dev/null; then 9 group="staff" 10 else 11 group="kong" 12 fi 13 14 # remove stale nodes 15 rm -f /dev/${device}? 16 17 # invoke insmod with all arguments we got 18 # and use a pathname, as newer modutils don't look in . by default 19 /sbin/insmod -f ./$module.ko $* || exit 1 20 21 major=`cat /proc/devices | awk "\$2=="$module" {print \$1}"` 22 23 mknod /dev/${device}0 c $major 0 24 mknod /dev/${device}1 c $major 1 25 ln -sf ${device}0 /dev/${device} 26 27 # give appropriate group/permissions 28 chgrp $group /dev/${device}[0-1] 29 chmod $mode /dev/${device}[0-1]
1 #!/bin/sh 2 # uninstall_mod.sh 3 module="memdev" 4 device="memdev" 5 6 # invoke rmmod with all arguments we got 7 /sbin/rmmod $module $* || exit 1 8 9 # Remove stale nodes 10 rm -f /dev/${device}0
linux驱动简单实例:
https://blog.csdn.net/yangjin_unique/article/details/8217104