gec6818蜂鸣器LED内核模块文件下载（驱动）
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gec6818蜂鸣器LED内核模块文件下载（驱动） #include <linux/module.h>#include <linux/kernel.h>#include <linux/cdev.h>#include <linux/uaccess.h>#include <linux/fs.h>#include <linux/ioport.h>#include <linux/io.h>#include <linux/miscdevice.h>#include <linux/ioctl.h>#include <linux/delay.h>#include <linux/gpio.h>#include <cfg_type.h>#define DEVICE_NAME "beep" //�豸����#define BUZZER_GPIO (PAD_GPIO_C + 14) //�ܽź�//#define BUZ_ON _IOW('B', 1, unsigned long)//#define BUZ_OFF _IOW('B', 0, unsigned long)//struct cdev /**************************************************���ƺ���*cmd ���÷�������״̬ 1 ---off 0 ----on*args ���÷������Ĺܽ�*************************************************///static long test_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long args)static long test_ioctl(struct file *file, unsigned int cmd, unsigned long args){if(args!=1) {printk("the args is out of range 1 \n");return -EINVAL;}switch(cmd){case 1:gpio_set_value(BUZZER_GPIO, 0); //off���ù̵ܽ�ֵ0printk("cmd = 0 , args=%ld\n", args);break;case 0:gpio_set_value(BUZZER_GPIO, 1) ; //on���ù̵ܽ�ֵ1printk("cmd = 1 , args=%ld\n", args);break;default:printk("the cmd is out of range(0,1) \n"); return -EINVAL;break;}return 0;}/**************************************************�ļ�������*************************************************/static const struct file_operations chrdev_fops = {.owner= THIS_MODULE,.unlocked_ioctl = test_ioctl,};/**************************************************�����豸*************************************************/static struct miscdevice buz_misc = {.minor = MISC_DYNAMIC_MINOR,.name = DEVICE_NAME,.fops = &chrdev_fops,};/*********************************************************************�����ij�ʼ������--->���ں���������Դ���ںˡ��жϡ��豸�š���....��********************************************************************/static int __init gec6818_buzzer_init(void) {int ret;ret = gpio_request( BUZZER_GPIO , "BUZZER"); //gpio�ܽ�����if(ret <0) {printk("EXYNOS6818_GPX3(5) can not request \n" );goto fail_gpio_request;}gpio_direction_output( BUZZER_GPIO, 0); //��GPIO����Ϊ���"0"ret = misc_register(&buz_misc); //�Զ������豸�ļ�if(ret <0){printk("can not register buz_misc \n");goto err_misc_register;}return 0; //����ע��ɹ�������0������ע��ʧ�ܣ�����һ������������//��������err_misc_register:fail_gpio_request:gpio_free(BUZZER_GPIO);return ret;}/******************************************************************�����˳����� --->���������Դ�����ں�*****************************************************************/static void __exit gec6818_buzzer_exit(void) {gpio_free(BUZZER_GPIO);misc_deregister(&buz_misc);printk("the driver is exiting!\n");}module_init(gec6818_buzzer_init); //��������ں��������һ���û��ij�ʼ������module_exit(gec6818_buzzer_exit); //�����ij��ں��������һ���û����˳�����//������������Ϣ�� #modinfo *.ko , ������������Ϣ�����DZ���ġ�MODULE_AUTHOR("ZOROE@GEC"); //����������MODULE_DESCRIPTION("Buzzer of driver"); //����������MODULE_LICENSE("GPL"); //��ѭ��Э��