Linux Device Drivers Development

RTC framework data structures

There are three main data structures used by the RTC framework in Linux systems. They are the strcut rtc_time, struct rtc_device, and struct rtc_class_ops structures. The first is an opaque structure that represents a given date and time; the second structure represents the physical RTC device; the last one represents a set of operations exposed by the driver, and is used by the RTC core to read/update a device's date/time/alarm.

The only header needed to pull RTC functions from within your driver is:

#include <linux/rtc.h> 

The same file contains all of the three structures enumerated in the preceding section:

struct rtc_time { int tm_sec; /* seconds after the minute */ int tm_min; /* minutes after the hour ...