RTC: Fix the cross interrupt issue on rtc-test.

The rtc-test driver is meant to provide a test/debug code for the RTC
subsystem.

The rtc-test driver simulates specific interrupts by echoing to the
sys interface. Those were the update, alarm and periodic interrupts.

As a side effect of the new implementation, any interrupt generated in
the rtc-test driver would trigger the same code path in the generic
code, and thus the distinction among interrupts gets lost.

This patch preserves the previous behaviour of the rtc-test driver,
where e.g. an update interrupt would not trigger an alarm or periodic
interrupt, and vice-versa. In real world RTC drivers, this is not an
issue, but in the rtc-test driver it may be interesting to distinguish
these interrupts for testing purposes.

CC: Thomas Gleixner <tglx@linutronix.de>
CC: Alessandro Zummo <a.zummo@towertech.it>
CC: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
CC: rtc-linux@googlegroups.com
Signed-off-by: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
Signed-off-by: John Stultz <john.stultz@linaro.org>

1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/rtc/rtc-test.c b/drivers/rtc/rtc-test.c
index a82d6fe97076..7e96254bd365 100644
--- a/drivers/rtc/rtc-test.c
+++ b/drivers/rtc/rtc-test.c
@@ -78,11 +78,16 @@ static ssize_t test_irq_store(struct device *dev,
         struct rtc_device *rtc = platform_get_drvdata(plat_dev);
 
         retval = count;
-        if (strncmp(buf, "tick", 4) == 0)
+        if (strncmp(buf, "tick", 4) == 0 && rtc->pie_enabled)
                 rtc_update_irq(rtc, 1, RTC_PF | RTC_IRQF);
-        else if (strncmp(buf, "alarm", 5) == 0)
-                rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
-        else if (strncmp(buf, "update", 6) == 0)
+        else if (strncmp(buf, "alarm", 5) == 0) {
+                struct rtc_wkalrm alrm;
+                int err = rtc_read_alarm(rtc, &alrm);
+
+                if (!err && alrm.enabled)
+                        rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
+
+        } else if (strncmp(buf, "update", 6) == 0 && rtc->uie_rtctimer.enabled)
                 rtc_update_irq(rtc, 1, RTC_UF | RTC_IRQF);
         else
                 retval = -EINVAL;