Add hooks for Boris Astardzhiev's RTC change for STM32L4 to Kinetis. Lower level logic not yet implemented.

arch/arm/src/kinetis/kinetis_alarm.h

@@ -84,6 +84,14 @@ struct alm_setalarm_s
   FAR void *as_arg;   /* Argument for callback */
 };
 
+/* Structure used to pass parameters to query an alarm */
+
+struct alm_rdalarm_s
+{
+  int ar_id;                   /* enum alm_id_e */
+  FAR struct rtc_time *ar_time;/* Argument for storing ALARM RTC time */
+};
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -114,6 +122,22 @@ extern "C"
 
 int kinetis_rtc_setalarm(FAR const struct timespec *tp, alarmcb_t callback);
 
+/************************************************************************************
+ * Name: kinetis_rtc_rdalarm
+ *
+ * Description:
+ *   Query an alarm configured in hardware.
+ *
+ * Input Parameters:
+ *  alminfo - Information about the alarm configuration.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno on failure
+ *
+ ************************************************************************************/
+
+int kinetis_rtc_rdalarm(FAR struct alm_rdalarm_s *alminfo);
+
 /****************************************************************************
  * Name: kinetis_rtc_cancelalarm
  *

arch/arm/src/kinetis/kinetis_rtc.c

@@ -584,4 +584,43 @@ int kinetis_rtc_cancelalarm(void)
 }
 #endif
 
+/************************************************************************************
+ * Name: kinetis_rtc_rdalarm
+ *
+ * Description:
+ *   Query an alarm configured in hardware.
+ *
+ * Input Parameters:
+ *  alminfo - Information about the alarm configuration.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno on failure
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_RTC_ALARM
+int kinetis_rtc_rdalarm(FAR struct alm_rdalarm_s *alminfo)
+{
+  int ret = -EINVAL;
+
+  ASSERT(alminfo != NULL);
+
+  switch (alminfo->ar_id)
+    {
+      case RTC_ALARMA:
+        {
+#warning Missing logic
+          ret = -ENOSYS;
+        }
+        break;
+
+      default:
+        rtcerr("ERROR: Invalid ALARM%d\n", alminfo->ar_id);
+        break;
+    }
+
+  return ret;
+}
+#endif
+
 #endif /* KINETIS_RTC */

arch/arm/src/kinetis/kinetis_rtc_lowerhalf.c

@@ -109,6 +109,8 @@ static int kinetis_setrelative(FAR struct rtc_lowerhalf_s *lower,
                                FAR const struct lower_setrelative_s *alarminfo);
 static int kinetis_cancelalarm(FAR struct rtc_lowerhalf_s *lower,
                                int alarmid);
+static int kinetis_rdalarm(FAR struct rtc_lowerhalf_s *lower,
+                           FAR struct lower_rdalarm_s *alarminfo);
 #endif
 
 /****************************************************************************
@@ -126,6 +128,7 @@ static const struct rtc_ops_s g_rtc_ops =
   .setalarm    = kinetis_setalarm,
   .setrelative = kinetis_setrelative,
   .cancelalarm = kinetis_cancelalarm,
+  .rdalarm     = kinetis_rdalarm,
 #endif
 #ifdef CONFIG_RTC_IOCTL
   .ioctl       = NULL,
@@ -492,6 +495,52 @@ static int kinetis_cancelalarm(FAR struct rtc_lowerhalf_s *lower, int alarmid)
 }
 #endif
 
+/****************************************************************************
+ * Name: kinetis_rdalarm
+ *
+ * Description:
+ *   Query the RTC alarm.
+ *
+ * Input Parameters:
+ *   lower     - A reference to RTC lower half driver state structure
+ *   alarminfo - Provided information needed to query the alarm
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; a negated errno value is returned
+ *   on any failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_RTC_ALARM
+static int kinetis_rdalarm(FAR struct rtc_lowerhalf_s *lower,
+                           FAR struct lower_rdalarm_s *alarminfo)
+{
+  struct alm_rdalarm_s lowerinfo;
+  int ret = -EINVAL;
+
+  ASSERT(lower != NULL && alarminfo != NULL && alarminfo->time != NULL);
+  DEBUGASSERT(alarminfo->id == RTC_ALARMA);
+
+  if (alarminfo->id == RTC_ALARMA)
+    {
+      /* Disable pre-emption while we do this so that we don't have to worry
+       * about being suspended and working on an old time.
+       */
+
+      sched_lock();
+
+      lowerinfo.ar_id   = alarminfo->id;
+      lowerinfo.ar_time = alarminfo->time;
+
+      ret = kinetis_rtc_rdalarm(&lowerinfo);
+
+      sched_unlock();
+    }
+
+  return ret;
+}
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/