設(shè)備驅(qū)動程序設(shè)計(編輯修改稿)
2025-03-13 01:43 本頁面
【文章內(nèi)容簡介】 buffer, size)。......close(fd)。 return 0。} 169。 2023 Embedded驅(qū)動程序的實現(xiàn)－驅(qū)動程序框架include linux/include linux/include linux/include linux/ /* printk() */include linux/ /* everything... */include linux/ /* error codes */include linux/ /* size_t */include linux/include linux/ /* O_ACCMODE */include linux/ /* COPY_TO_USER */include asm/ /* cli(), *_flags */define DEVICE_NAME demodefine demo_MAJOR 250define demo_MINOR 0static ssize_t demo_write(struct file *filp,const char *buffer, size_t count) { copy_from_user(drv_buf , buffer, count)。WRI_LENGTH = count。printk(user write data to driver\n)。//your code herereturn count。} 169。 2023 Embedded驅(qū)動程序的實現(xiàn)－驅(qū)動程序框架static ssize_t demo_read(struct file *filp, char *buffer, size_t count, loff_t *ppos) {if(count MAX_BUF_LEN)count=MAX_BUF_LEN。copy_to_user(buffer, drv_buf,count)。printk(user read data from driver\n)。return count。}static int demo_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) {printk(ioctl runing\n)。switch(cmd){case 1:printk(runing mand 1 \n)。break。case 2:printk(runing mand 2 \n)。break。default:printk(error cmd number\n)。break。}return 0。}static int demo_open(struct inode *inode, struct file *file) {MOD_INC_USE_COUNT。sprintf(drv_buf,device open sucess!\n)。printk(device open sucess!\n)。return 0。} 169。 2023 Embedded驅(qū)動程序的實現(xiàn)－驅(qū)動程序框架static int demo_release(struct inode *inode, struct file *filp) {MOD_DEC_USE_COUNT。printk(device release\n)。return 0。} static struct file_operations demo_fops = {owner: THIS_MODULE,write: demo_write, read: demo_read, ioctl: demo_ioctl,open: demo_open,release: demo_release,}。 static int __init demo_init(void) { SET_MODULE_OWNER(demo_fops)。 result = register_chrdev(demo_MAJOR, demo, demo_fops)。 if (result 0) return result。printk(DEVICE_NAME initialized\n)。return 0。} static void __exit demo_exit(void) { unregister_chrdev(demo_MAJOR, demo)。printk(DEVICE_NAME unloaded\n)。} module_init(demo_init)。module_exit(demo_exit)。
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