wl1271: Add retry implementation for PSM entries

PSM entries can fail (transmitting the corresponding null-func may not
be heard by the AP.) Previously, this scenario was not detected, and
out-of-sync between STA and AP could occur.

Add retry implementation for the entries to recover from the situation.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/wl12xx/wl1271_event.h b/drivers/net/wireless/wl12xx/wl1271_event.h
index 3ab53d3..4e3f55e 100644
--- a/drivers/net/wireless/wl12xx/wl1271_event.h
+++ b/drivers/net/wireless/wl12xx/wl1271_event.h
@@ -63,6 +63,13 @@
 	EVENT_MBOX_ALL_EVENT_ID			 = 0x7fffffff,
 };
 
+enum {
+	EVENT_ENTER_POWER_SAVE_FAIL = 0,
+	EVENT_ENTER_POWER_SAVE_SUCCESS,
+	EVENT_EXIT_POWER_SAVE_FAIL,
+	EVENT_EXIT_POWER_SAVE_SUCCESS,
+};
+
 struct event_debug_report {
 	u8 debug_event_id;
 	u8 num_params;