From 1ed0b9997c22f1f1933db24ed7dd83c6a578f232 Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Tue, 14 Feb 2012 15:23:59 +0100
Subject: [PATCH] atmodem: Fix handling of IFX signal strength indication

---
 drivers/atmodem/network-registration.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/atmodem/network-registration.c b/drivers/atmodem/network-registration.c
index 7890fb1b..d098d373 100644
--- a/drivers/atmodem/network-registration.c
+++ b/drivers/atmodem/network-registration.c
@@ -692,12 +692,18 @@ static void ifx_xciev_notify(GAtResult *result, gpointer user_data)
 	if (!g_at_result_iter_next_number(&iter, &ind))
 		return;
 
-	if (ind == 0)
+	/*
+	 * Radio signal strength indicators are defined for 0-7,
+	 * but in some cases XCIEV just returns CSQ 0-31,99 values.
+	 */
+	if (ind == 0 || ind == 99)
 		strength = -1;
 	else if (ind == 7)
 		strength = 100;
-	else
+	else if (ind < 7)
 		strength = (ind * 15);
+	else if (ind > 7)
+		strength = (ind * 100) / 31;
 
 	DBG("ind %d strength %d", ind, strength);