extern void rtc_update_irq(struct rtc_device *rtc,
unsigned long num, unsigned long events);
-extern struct rtc_device *rtc_class_open(char *name);
+extern struct rtc_device *rtc_class_open(const char *name);
extern void rtc_class_close(struct rtc_device *rtc);
extern int rtc_irq_register(struct rtc_device *rtc,