linux的rtc可以定时的时钟驱动代码

#include <linux/fs.h> #include <linux/module.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/cdev.h> #include <linux/ioport.h> #include <linux/pci.h> #include <asm/uaccess.h> #include <asm/io.h> #include <asm/irq.h> #include <linux/interrupt.h> #include <asm/mach/irq.h> #include <asm/arch/regs-gpio.h> #include <linux/poll.h> #include <linux/platform_device.h> #include <asm/irq.h> #define BCDTODEC(val) ((val/16)*10+(val%16)) #define DECTOBCD(val) ((val/10)*16+(val%10)) static unsigned int fs2410_rtc_major =0; static struct class *fs2410_rtc_class =NULL; static volatile unsigned long *rtccon =NULL; static volatile unsigned long *ticnt =NULL; static volatile unsigned long *rtcrst=NULL; static volatile unsigned long *bcdsec=NULL; static volatile unsigned long *bcdmin=NULL; static volatile unsigned long *bcdhour=NULL; static volatile unsigned long *bcdday=NULL; static volatile unsigned long *bcdweek=NULL; static volatile unsigned long *bcdmon=NULL; static volatile unsigned long *bcdyear=NULL; static volatile unsigned long *rtcalm=NULL; static volatile unsigned long *almsec=NULL; static volatile unsigned long *almmin=NULL; static volatile unsigned long *almhour=NULL; static volatile unsigned long *almday=NULL; static volatile unsigned long *almmon=NULL; static volatile unsigned long *almyear=NULL; static struct rtc_time{ int type; unsigned int sec; unsigned int min; unsigned int hour; unsigned int day; unsigned int week; unsigned int mon; unsigned int year; unsigned int alarm_sec; unsigned int alarm_min; unsigned int alarm_hour; unsigned int alarm_day; unsigned int alarm_mon; unsigned int alarm_year; }; static irqreturn_t rtc_irq_handle(int irq, void *dev_id) { printk("rtc alrm!\n"); *rtcalm = 0x0; return IRQ_HANDLED; } static int fs2410_rtc_open(struct inode *inode, struct file *file) { *rtccon |= (1<<0); int ret =request_irq(IRQ_RTC, rtc_irq_handle, IRQF_TRIGGER_FALLING,"rtc_alarm",NULL); return 0; } static ssize_t fs2410_rtc_write(struct file *file, const char __user *buf, size_t count, loff_t *opps) { int ret; struct rtc_time set_rtc_buf; ret = copy_from_user(&set_rtc_buf,buf, count); if(set_rtc_buf.type == 0) { *rtccon =0x5; *ticnt = 0xff; *rtcrst = 0xd; *bcdsec = DECTOBCD(set_rtc_buf.sec); *bcdmin = DECTOBCD(set_rtc_buf.min); *bcdhour= DECTOBCD(set_rtc_buf.hour); *bcdday = DECTOBCD(set_rtc_buf.day); *bcdweek= DECTOBCD(set_rtc_buf.week); *bcdmon= DECTOBCD(set_rtc_buf.mon); *bcdyear= DECTOBCD(set_rtc_buf.year); *rtccon = 0x0; } *rtcalm = 0xff; *almsec = DECTOBCD(set_rtc_buf.alarm_sec); *almmin = DECTOBCD(set_rtc_buf.alarm_min); *almhour= DECTOBCD(set_rtc_buf.alarm_hour); *almday= DECTOBCD(set_rtc_buf.alarm_day); *almmon = DECTOBCD(set_rtc_buf.alarm_mon); *almyear= DECTOBCD(set_rtc_buf.alarm_year); return 0; } static ssize_t fs2410_rtc_read(struct file *file, char __user *buf, size_t count, loff_t *opps) { static struct rtc_time val; val.sec=BCDTODEC(*bcdsec); val.min=BCDTODEC(*bcdmin);; val.hour=BCDTODEC(*bcdhour);; val.day=BCDTODEC(*bcdday); val.week=BCDTODEC(*bcdweek); val.mon=BCDTODEC(*bcdmon); val.year =BCDTODEC(*bcdyear)+1920; //*rtccon = 0x0; copy_to_user(buf, &val, count); return 0; } struct file_operations fs2410_rtc_fops ={ .owner =THIS_MODULE, .open =fs2410_rtc_open, .read =fs2410_rtc_read, .write =fs2410_rtc_write, }; int fs2410_rtc_probe(struct platform_device *pdev) { struct resource *res; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); rtccon = ioremap(res->start, res->end -res->start); ticnt = rtccon+1; rtcalm = rtccon + 4; almsec = rtccon + 5; almmin = rtccon + 6; almhour = rtccon +7; almday= rtccon +8; almmon = rtccon +9; almyear = rtccon +10; rtcrst = rtccon+11; bcdsec = rtccon+12; bcdmin = rtccon+13; bcdhour = rtccon+14; bcdday = rtccon+15; bcdweek = rtccon+16; bcdmon = rtccon+17; bcdyear = rtccon+18; fs2410_rtc_major =register_chrdev(0, "rtcs",&fs2410_rtc_fops); fs2410_rtc_class =class_create(THIS_MODULE, "rtc_class"); class_device_create(fs2410_rtc_class, NULL,MKDEV(fs2410_rtc_major, 0), NULL, "rtc"); return 0; } int fs2410_rtc_remove(struct platform_device *pdev) { unregister_chrdev(fs2410_rtc_major, "rtcs"); class_device_destroy(fs2410_rtc_class, MKDEV(fs2410_rtc_major, 0)); class_destroy(fs2410_rtc_class); iounmap(rtccon); return 0; } struct platform_driver fs2410_rtc_driver ={ .probe =fs2410_rtc_probe, .remove =fs2410_rtc_remove, .driver ={ .owner =THIS_MODULE, .name ="fs2410-rtc", }, }; static int __init fs2410_rtc_drv_init(void) { platform_driver_register(&fs2410_rtc_driver); return 0; } static void __exit fs2410_rtc_drv_exit(void) { platform_driver_unregister(&fs2410_rtc_driver); } module_init(fs2410_rtc_drv_init); module_exit(fs2410_rtc_drv_exit); MODULE_LICENSE("GPL");