Advantech RSB-4210 Evaluation Kit User Manual download pdf (Page 88)

RSB-4210 User Manual 80

* RTC_IRQP_SET, RTC_IRQP_READ: the irq_set_freq function will be called

to set the frequency while the framework will handle the read for you since the fre-

quency is stored in the irq_freq member of the rtc_device structure. Your driver

needs to initialize the irq_freq member during init. Make sure you check the

requested frequency is in range of your hardware in the irq_set_freq function. If it

isn't, return -EINVAL. If you cannot actually change the frequency, do not define

irq_set_freq.

* RTC_PIE_ON, RTC_PIE_OFF: the irq_set_state function will be called.

If all else fails, check out the rtc-test.c driver!

/****************************************************

/* Real Time Clock Driver Test/Example Program

/* Compile with:*gcc -s -Wall -Wstrict-prototypes rtctest.c -o rtctest

/* Released under the GNU General Public License, version 2,

/* included herein by reference.

/* ****************************************************/

#include <stdio.h>

#include <linux/rtc.h>

#include <sys/ioctl.h>

#include <sys/time.h>

#include <sys/types.h>

#include <fcntl.h>

#include <unistd.h>

#include <stdlib.h>

#include <errno.h>

* This expects the new RTC class driver framework, working

with

* clocks that will often not be clones of what the PC-AT had.

* Use the command line to specify another RTC if you need one.

static const char default_rtc[] = "/dev/rtc0";

int main(int argc, char **argv)

{

int i, fd, retval, irqcount = 0;

unsigned long tmp, data;

struct rtc_time rtc_tm;

const char *rtc = default_rtc;

switch (argc) {

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Advantech RSB-4210 Evaluation Kit User Manual Page 88