[rtc-linux] rtctest woes

["Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>]

Hello,

I'm running rtctest (i.e. tools/testing/selftests/timers/rtctest.c)
against a pcf2127 i2c rtc. The driver doesn't have alarm support.

The first problem is that calling ioctl(fd, RTC_UIE_ON, 0) returns -1
and sets errno to EINVAL but rtctest expects ENOTTY if update irqs are
not supported. (I'll send a patch in reply to this mail.)

Then with this issue fixed the next failure is at ioctl(fd,
RTC_ALM_READ, &rtc_tm) after ioctl(fd, RTC_ALM_SET, &rtc_tm) succeeded.
If I understand the code correctly the RTC_ALM_SET is emulated using
kernel timers but ALM_GET is not. I'd say the right fix here is that
RTC_ALM_SET should already fail in this case, but as I'm not sure I
didn't create a patch.

BTW, asking scripts/get_maintainer.pl where to send a patch touching
rtctest the reply includes the timekeeping and selftest maintainer
entrys but not the rtc one. I suggest to move rtctest to
tools/testing/selftests/rtc/rtctest.c.

Best regards
Uwe

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Pengutronix e.K.                           | Uwe Kleine-K=C3=B6nig         =
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Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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