SAMA5: Add oneshot max_delay method

arch/arm/src/sama5/sam_oneshot.c

@@ -222,6 +222,32 @@ int sam_oneshot_initialize(struct sam_oneshot_s *oneshot, int chan,
   return OK;
 }
 
+/****************************************************************************
+ * Name: sam_oneshot_max_delay
+ *
+ * Description:
+ *   Return the maximum delay supported by the one shot timer (in
+ *   microseconds).
+ *
+ * Input Parameters:
+ *   oneshot Caller allocated instance of the oneshot state structure.  This
+ *           structure must have been previously initialized via a call to
+ *           sam_oneshot_initialize();
+ *   usec    The location in which to return the maximum delay.
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; a negated errno value is returned
+ *   on failure.
+ *
+ ****************************************************************************/
+
+int sam_oneshot_max_delay(struct sam_oneshot_s *oneshot, uint64_t *usec)
+{
+  DEBUGASSERT(oneshot != NULL && usec != NULL);
+  *usec = (0xffffull * USEC_PER_SEC) / (uint64_t)sam_tc_divfreq(oneshot->tch);
+  return OK;
+}
+
 /****************************************************************************
  * Name: sam_oneshot_start
  *

arch/arm/src/sama5/sam_oneshot.h

@@ -131,6 +131,27 @@ extern "C"
 int sam_oneshot_initialize(struct sam_oneshot_s *oneshot, int chan,
                            uint16_t resolution);
 
+/****************************************************************************
+ * Name: sam_oneshot_max_delay
+ *
+ * Description:
+ *   Return the maximum delay supported by the one shot timer (in
+ *   microseconds).
+ *
+ * Input Parameters:
+ *   oneshot Caller allocated instance of the oneshot state structure.  This
+ *           structure must have been previously initialized via a call to
+ *           sam_oneshot_initialize();
+ *   usec    The location in which to return the maximum delay.
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; a negated errno value is returned
+ *   on failure.
+ *
+ ****************************************************************************/
+
+int sam_oneshot_max_delay(struct sam_oneshot_s *oneshot, uint64_t *usec);
+
 /****************************************************************************
  * Name: sam_oneshot_start
  *

arch/arm/src/sama5/sam_oneshot_lowerhalf.c

@@ -172,12 +172,23 @@ static void sam_oneshot_handler(void *arg)
 static int sam_max_delay(FAR struct oneshot_lowerhalf_s *lower,
                          FAR struct timespec *ts)
 {
-  DEBUGASSERT(lower != NULL && ts != NULL);
+  FAR struct sam_oneshot_lowerhalf_s *priv =
+    (FAR struct sam_oneshot_lowerhalf_s *)lower;
+  uint64_t usecs;
+  int ret;
 
-#warning Missing logic
-  ts->tv_sec  = INT_MAX;
-  ts->tv_nsec = LONG_MAX;
-  return -ENOSYS;
+  DEBUGASSERT(priv != NULL && ts != NULL);
+  ret = sam_oneshot_max_delay(&priv->oneshot, &usecs);
+  if (ret >= 0)
+    {
+      uint64_t sec = usecs / 1000000;
+      usecs -= 1000000 * sec;
+
+      ts->tv_sec  = (time_t)sec;
+      ts->tv_nsec = (long)(usecs * 1000);
+    }
+
+  return ret;
 }
 
 /****************************************************************************
@@ -333,4 +344,4 @@ FAR struct oneshot_lowerhalf_s *oneshot_initialize(int chan,
     }
 
   return &priv->lh;
-}
+}

arch/arm/src/samv7/sam_oneshot.c

@@ -223,6 +223,32 @@ int sam_oneshot_initialize(struct sam_oneshot_s *oneshot, int chan,
   return OK;
 }
 
+/****************************************************************************
+ * Name: sam_oneshot_max_delay
+ *
+ * Description:
+ *   Return the maximum delay supported by the one shot timer (in
+ *   microseconds).
+ *
+ * Input Parameters:
+ *   oneshot Caller allocated instance of the oneshot state structure.  This
+ *           structure must have been previously initialized via a call to
+ *           sam_oneshot_initialize();
+ *   usec    The location in which to return the maximum delay.
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; a negated errno value is returned
+ *   on failure.
+ *
+ ****************************************************************************/
+
+int sam_oneshot_max_delay(struct sam_oneshot_s *oneshot, uint64_t *usec)
+{
+  DEBUGASSERT(oneshot != NULL && usec != NULL);
+  *usec = (0xffffull * USEC_PER_SEC) / (uint64_t)sam_tc_divfreq(oneshot->tch);
+  return OK;
+}
+
 /****************************************************************************
  * Name: sam_oneshot_start
  *
@@ -491,30 +517,4 @@ int sam_oneshot_cancel(struct sam_oneshot_s *oneshot,
   return OK;
 }
 
-/****************************************************************************
- * Name: sam_oneshot_max_delay
- *
- * Description:
- *   Return the maximum delay supported by the one shot timer (in
- *   microseconds).
- *
- * Input Parameters:
- *   oneshot Caller allocated instance of the oneshot state structure.  This
- *           structure must have been previously initialized via a call to
- *           sam_oneshot_initialize();
- *   usec    The location in which to return the maximum delay.
- *
- * Returned Value:
- *   Zero (OK) is returned on success; a negated errno value is returned
- *   on failure.
- *
- ****************************************************************************/
-
-int sam_oneshot_max_delay(struct sam_oneshot_s *oneshot, uint64_t *usec)
-{
-  DEBUGASSERT(oneshot && usec);
-  *usec = (0xffffull * USEC_PER_SEC) / (uint64_t)sam_tc_divfreq(oneshot->tch);
-  return OK;
-}
-
 #endif /* CONFIG_SAMV7_ONESHOT */