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// SPDX-License-Identifier: GPL-2.0
/*
* Real Time Clock Driver Test Program
*
* Copyright (c) 2018 Alexandre Belloni <alexandre.belloni@bootlin.com>
*/
#include <errno.h>
#include <fcntl.h>
#include <linux/rtc.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include "../kselftest_harness.h"
#define NUM_UIE 3
#define ALARM_DELTA 3
#define READ_LOOP_DURATION_SEC 30
#define READ_LOOP_SLEEP_MS 11
static char *rtc_file = "/dev/rtc0";
FIXTURE(rtc) {
int fd;
};
FIXTURE_SETUP(rtc) {
self->fd = open(rtc_file, O_RDONLY);
}
FIXTURE_TEARDOWN(rtc) {
close(self->fd);
}
TEST_F(rtc, date_read) {
int rc;
struct rtc_time rtc_tm;
if (self->fd == -1 && errno == ENOENT)
SKIP(return, "Skipping test since %s does not exist", rtc_file);
ASSERT_NE(-1, self->fd);
/* Read the RTC time/date */
rc = ioctl(self->fd, RTC_RD_TIME, &rtc_tm);
ASSERT_NE(-1, rc);
TH_LOG("Current RTC date/time is %02d/%02d/%02d %02d:%02d:%02d.",
rtc_tm.tm_mday, rtc_tm.tm_mon + 1, rtc_tm.tm_year + 1900,
rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
}
static time_t rtc_time_to_timestamp(struct rtc_time *rtc_time)
{
struct tm tm_time = {
.tm_sec = rtc_time->tm_sec,
.tm_min = rtc_time->tm_min,
.tm_hour = rtc_time->tm_hour,
.tm_mday = rtc_time->tm_mday,
.tm_mon = rtc_time->tm_mon,
.tm_year = rtc_time->tm_year,
};
return mktime(&tm_time);
}
static void nanosleep_with_retries(long ns)
{
struct timespec req = {
.tv_sec = 0,
.tv_nsec = ns,
};
struct timespec rem;
while (nanosleep(&req, &rem) != 0) {
req.tv_sec = rem.tv_sec;
req.tv_nsec = rem.tv_nsec;
}
}
TEST_F_TIMEOUT(rtc, date_read_loop, READ_LOOP_DURATION_SEC + 2) {
int rc;
long iter_count = 0;
struct rtc_time rtc_tm;
time_t start_rtc_read, prev_rtc_read;
if (self->fd == -1 && errno == ENOENT)
SKIP(return, "Skipping test since %s does not exist", rtc_file);
ASSERT_NE(-1, self->fd);
TH_LOG("Continuously reading RTC time for %ds (with %dms breaks after every read).",
READ_LOOP_DURATION_SEC, READ_LOOP_SLEEP_MS);
rc = ioctl(self->fd, RTC_RD_TIME, &rtc_tm);
ASSERT_NE(-1, rc);
start_rtc_read = rtc_time_to_timestamp(&rtc_tm);
prev_rtc_read = start_rtc_read;
do {
time_t rtc_read;
rc = ioctl(self->fd, RTC_RD_TIME, &rtc_tm);
ASSERT_NE(-1, rc);
rtc_read = rtc_time_to_timestamp(&rtc_tm);
/* Time should not go backwards */
ASSERT_LE(prev_rtc_read, rtc_read);
/* Time should not increase more then 1s at a time */
ASSERT_GE(prev_rtc_read + 1, rtc_read);
/* Sleep 11ms to avoid killing / overheating the RTC */
nanosleep_with_retries(READ_LOOP_SLEEP_MS * 1000000);
prev_rtc_read = rtc_read;
iter_count++;
} while (prev_rtc_read <= start_rtc_read + READ_LOOP_DURATION_SEC);
TH_LOG("Performed %ld RTC time reads.", iter_count);
}
TEST_F_TIMEOUT(rtc, uie_read, NUM_UIE + 2) {
int i, rc, irq = 0;
unsigned long data;
if (self->fd == -1 && errno == ENOENT)
SKIP(return, "Skipping test since %s does not exist", rtc_file);
ASSERT_NE(-1, self->fd);
/* Turn on update interrupts */
rc = ioctl(self->fd, RTC_UIE_ON, 0);
if (rc == -1) {
ASSERT_EQ(EINVAL, errno);
TH_LOG("skip update IRQs not supported.");
return;
}
for (i = 0; i < NUM_UIE; i++) {
/* This read will block */
rc = read(self->fd, &data, sizeof(data));
ASSERT_NE(-1, rc);
irq++;
}
EXPECT_EQ(NUM_UIE, irq);
rc = ioctl(self->fd, RTC_UIE_OFF, 0);
ASSERT_NE(-1, rc);
}
TEST_F(rtc, uie_select) {
int i, rc, irq = 0;
unsigned long data;
if (self->fd == -1 && errno == ENOENT)
SKIP(return, "Skipping test since %s does not exist", rtc_file);
ASSERT_NE(-1, self->fd);
/* Turn on update interrupts */
rc = ioctl(self->fd, RTC_UIE_ON, 0);
if (rc == -1) {
ASSERT_EQ(EINVAL, errno);
TH_LOG("skip update IRQs not supported.");
return;
}
for (i = 0; i < NUM_UIE; i++) {
struct timeval tv = { .tv_sec = 2 };
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(self->fd, &readfds);
/* The select will wait until an RTC interrupt happens. */
rc = select(self->fd + 1, &readfds, NULL, NULL, &tv);
ASSERT_NE(-1, rc);
ASSERT_NE(0, rc);
/* This read won't block */
rc = read(self->fd, &data, sizeof(unsigned long));
ASSERT_NE(-1, rc);
irq++;
}
EXPECT_EQ(NUM_UIE, irq);
rc = ioctl(self->fd, RTC_UIE_OFF, 0);
ASSERT_NE(-1, rc);
}
TEST_F(rtc, alarm_alm_set) {
struct timeval tv = { .tv_sec = ALARM_DELTA + 2 };
unsigned long data;
struct rtc_time tm;
fd_set readfds;
time_t secs, new;
int rc;
if (self->fd == -1 && errno == ENOENT)
SKIP(return, "Skipping test since %s does not exist", rtc_file);
ASSERT_NE(-1, self->fd);
rc = ioctl(self->fd, RTC_RD_TIME, &tm);
ASSERT_NE(-1, rc);
secs = timegm((struct tm *)&tm) + ALARM_DELTA;
gmtime_r(&secs, (struct tm *)&tm);
rc = ioctl(self->fd, RTC_ALM_SET, &tm);
if (rc == -1) {
ASSERT_EQ(EINVAL, errno);
TH_LOG("skip alarms are not supported.");
return;
}
rc = ioctl(self->fd, RTC_ALM_READ, &tm);
ASSERT_NE(-1, rc);
TH_LOG("Alarm time now set to %02d:%02d:%02d.",
tm.tm_hour, tm.tm_min, tm.tm_sec);
/* Enable alarm interrupts */
rc = ioctl(self->fd, RTC_AIE_ON, 0);
ASSERT_NE(-1, rc);
FD_ZERO(&readfds);
FD_SET(self->fd, &readfds);
rc = select(self->fd + 1, &readfds, NULL, NULL, &tv);
ASSERT_NE(-1, rc);
ASSERT_NE(0, rc);
/* Disable alarm interrupts */
rc = ioctl(self->fd, RTC_AIE_OFF, 0);
ASSERT_NE(-1, rc);
rc = read(self->fd, &data, sizeof(unsigned long));
ASSERT_NE(-1, rc);
TH_LOG("data: %lx", data);
rc = ioctl(self->fd, RTC_RD_TIME, &tm);
ASSERT_NE(-1, rc);
new = timegm((struct tm *)&tm);
ASSERT_EQ(new, secs);
}
TEST_F(rtc, alarm_wkalm_set) {
struct timeval tv = { .tv_sec = ALARM_DELTA + 2 };
struct rtc_wkalrm alarm = { 0 };
struct rtc_time tm;
unsigned long data;
fd_set readfds;
time_t secs, new;
int rc;
if (self->fd == -1 && errno == ENOENT)
SKIP(return, "Skipping test since %s does not exist", rtc_file);
ASSERT_NE(-1, self->fd);
rc = ioctl(self->fd, RTC_RD_TIME, &alarm.time);
ASSERT_NE(-1, rc);
secs = timegm((struct tm *)&alarm.time) + ALARM_DELTA;
gmtime_r(&secs, (struct tm *)&alarm.time);
alarm.enabled = 1;
rc = ioctl(self->fd, RTC_WKALM_SET, &alarm);
if (rc == -1) {
ASSERT_EQ(EINVAL, errno);
TH_LOG("skip alarms are not supported.");
return;
}
rc = ioctl(self->fd, RTC_WKALM_RD, &alarm);
ASSERT_NE(-1, rc);
TH_LOG("Alarm time now set to %02d/%02d/%02d %02d:%02d:%02d.",
alarm.time.tm_mday, alarm.time.tm_mon + 1,
alarm.time.tm_year + 1900, alarm.time.tm_hour,
alarm.time.tm_min, alarm.time.tm_sec);
FD_ZERO(&readfds);
FD_SET(self->fd, &readfds);
rc = select(self->fd + 1, &readfds, NULL, NULL, &tv);
ASSERT_NE(-1, rc);
ASSERT_NE(0, rc);
rc = read(self->fd, &data, sizeof(unsigned long));
ASSERT_NE(-1, rc);
rc = ioctl(self->fd, RTC_RD_TIME, &tm);
ASSERT_NE(-1, rc);
new = timegm((struct tm *)&tm);
ASSERT_EQ(new, secs);
}
TEST_F_TIMEOUT(rtc, alarm_alm_set_minute, 65) {
struct timeval tv = { .tv_sec = 62 };
unsigned long data;
struct rtc_time tm;
fd_set readfds;
time_t secs, new;
int rc;
if (self->fd == -1 && errno == ENOENT)
SKIP(return, "Skipping test since %s does not exist", rtc_file);
ASSERT_NE(-1, self->fd);
rc = ioctl(self->fd, RTC_RD_TIME, &tm);
ASSERT_NE(-1, rc);
secs = timegm((struct tm *)&tm) + 60 - tm.tm_sec;
gmtime_r(&secs, (struct tm *)&tm);
rc = ioctl(self->fd, RTC_ALM_SET, &tm);
if (rc == -1) {
ASSERT_EQ(EINVAL, errno);
TH_LOG("skip alarms are not supported.");
return;
}
rc = ioctl(self->fd, RTC_ALM_READ, &tm);
ASSERT_NE(-1, rc);
TH_LOG("Alarm time now set to %02d:%02d:%02d.",
tm.tm_hour, tm.tm_min, tm.tm_sec);
/* Enable alarm interrupts */
rc = ioctl(self->fd, RTC_AIE_ON, 0);
ASSERT_NE(-1, rc);
FD_ZERO(&readfds);
FD_SET(self->fd, &readfds);
rc = select(self->fd + 1, &readfds, NULL, NULL, &tv);
ASSERT_NE(-1, rc);
ASSERT_NE(0, rc);
/* Disable alarm interrupts */
rc = ioctl(self->fd, RTC_AIE_OFF, 0);
ASSERT_NE(-1, rc);
rc = read(self->fd, &data, sizeof(unsigned long));
ASSERT_NE(-1, rc);
TH_LOG("data: %lx", data);
rc = ioctl(self->fd, RTC_RD_TIME, &tm);
ASSERT_NE(-1, rc);
new = timegm((struct tm *)&tm);
ASSERT_EQ(new, secs);
}
TEST_F_TIMEOUT(rtc, alarm_wkalm_set_minute, 65) {
struct timeval tv = { .tv_sec = 62 };
struct rtc_wkalrm alarm = { 0 };
struct rtc_time tm;
unsigned long data;
fd_set readfds;
time_t secs, new;
int rc;
if (self->fd == -1 && errno == ENOENT)
SKIP(return, "Skipping test since %s does not exist", rtc_file);
ASSERT_NE(-1, self->fd);
rc = ioctl(self->fd, RTC_RD_TIME, &alarm.time);
ASSERT_NE(-1, rc);
secs = timegm((struct tm *)&alarm.time) + 60 - alarm.time.tm_sec;
gmtime_r(&secs, (struct tm *)&alarm.time);
alarm.enabled = 1;
rc = ioctl(self->fd, RTC_WKALM_SET, &alarm);
if (rc == -1) {
ASSERT_EQ(EINVAL, errno);
TH_LOG("skip alarms are not supported.");
return;
}
rc = ioctl(self->fd, RTC_WKALM_RD, &alarm);
ASSERT_NE(-1, rc);
TH_LOG("Alarm time now set to %02d/%02d/%02d %02d:%02d:%02d.",
alarm.time.tm_mday, alarm.time.tm_mon + 1,
alarm.time.tm_year + 1900, alarm.time.tm_hour,
alarm.time.tm_min, alarm.time.tm_sec);
FD_ZERO(&readfds);
FD_SET(self->fd, &readfds);
rc = select(self->fd + 1, &readfds, NULL, NULL, &tv);
ASSERT_NE(-1, rc);
ASSERT_NE(0, rc);
rc = read(self->fd, &data, sizeof(unsigned long));
ASSERT_NE(-1, rc);
rc = ioctl(self->fd, RTC_RD_TIME, &tm);
ASSERT_NE(-1, rc);
new = timegm((struct tm *)&tm);
ASSERT_EQ(new, secs);
}
static void __attribute__((constructor))
__constructor_order_last(void)
{
if (!__constructor_order)
__constructor_order = _CONSTRUCTOR_ORDER_BACKWARD;
}
int main(int argc, char **argv)
{
switch (argc) {
case 2:
rtc_file = argv[1];
/* FALLTHROUGH */
case 1:
break;
default:
fprintf(stderr, "usage: %s [rtcdev]\n", argv[0]);
return 1;
}
return test_harness_run(argc, argv);
}
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