icE1usb: Add support for reporting remote alarm (RAI) as YELLOW alarm

In osmo-e1-hardware.git Change-Id Ic4f57cf79bd32cf75f81ef3073cb8d4a2d1857d8
the icE1usb firmware gained support for reporting the E1_ERR_F_RAI flag
via USB interrupt transfers.  Make use of that to report YELLOW alarm
via the usual DAHDI alarms infrastructure.

drivers/dahdi/icE1usb/icE1usb.c

@@ -531,7 +531,8 @@ static void ice1usb_update_counters(struct ice1usb *ieu, const struct ice1usb_ir
 	memcpy(&ieu->last_err, err, sizeof(ieu->last_err));
 }
 
-#define ALL_RED_ALARMS (DAHDI_ALARM_RED | DAHDI_ALARM_LFA | DAHDI_ALARM_LMFA | ICE1USB_ERR_F_LOS)
+#define ALL_RY_ALARMS (DAHDI_ALARM_RED | DAHDI_ALARM_YELLOW | \
+		       DAHDI_ALARM_LFA | DAHDI_ALARM_LMFA | ICE1USB_ERR_F_LOS)
 
 /* interrupt EP completes: Process and resubmit */
 static void ice1usb_irq_complete(struct urb *urb)
@@ -558,7 +559,9 @@ static void ice1usb_irq_complete(struct urb *urb)
 				alarms |= DAHDI_ALARM_RED | DAHDI_ALARM_LOS;
 			if (err->flags & ICE1USB_ERR_F_ALIGN_ERR)
 				alarms |= DAHDI_ALARM_RED | DAHDI_ALARM_LFA | DAHDI_ALARM_LMFA;
-			ieu->dahdi.span.alarms &= ~ALL_RED_ALARMS;
+			if (err->flags & ICE1USB_ERR_F_RAI)
+				alarms |= DAHDI_ALARM_YELLOW;
+			ieu->dahdi.span.alarms &= ~ALL_RY_ALARMS;
 			ieu->dahdi.span.alarms |= alarms;
 			dahdi_alarm_notify(&ieu->dahdi.span);
 			ice1usb_update_counters(ieu, err);

drivers/dahdi/icE1usb/ice1usb_proto.h

@@ -85,9 +85,10 @@ enum ice1usb_irq_type {
 	ICE1USB_IRQ_T_ERRCNT		= 1,
 };
 
-/* Ensue ro keep those in sync with e1.h */
+/* Ensue to keep those in sync with e1.h */
 #define ICE1USB_ERR_F_ALIGN_ERR	0x01
 #define ICE1USB_ERR_F_LOS	0x02
+#define ICE1USB_ERR_F_RAI	0x04
 
 struct ice1usb_irq_err {
 	/* 16-bit little-endian counters */