uqmi: add illegal SIM state recovery

On some network-triggered disconnections the UIM state might end up in
"illegal". This prevents the modem from attaching to any network in
non-restricted service modes.

Detect this state and reset the SIM card. This way, the modem can attach
to networks again.

Signed-off-by: David Bauer <mail@david-bauer.net>

diff --git a/package/network/utils/uqmi/files/lib/netifd/proto/qmi.sh b/package/network/utils/uqmi/files/lib/netifd/proto/qmi.sh
index f4432b4fa33676e0bacc7e7e6e7a0244cc11c37d..52515dd9c1efa088620cdcd59e61e28a83a88143 100755 (executable)
--- a/package/network/utils/uqmi/files/lib/netifd/proto/qmi.sh
+++ b/package/network/utils/uqmi/files/lib/netifd/proto/qmi.sh
@@ -98,6 +98,37 @@ proto_qmi_setup() {
                fi
        done
 
+       # Check if UIM application is stuck in illegal state
+       local uim_state_timeout=0
+       while true; do
+               json_load "$(uqmi -s -d "$device" --uim-get-sim-state)"
+               json_get_var card_application_state card_application_state
+
+               # SIM card is either completely absent or state is labeled as illegal
+               # Try to power-cycle the SIM card to recover from this state
+               if [ -z "$card_application_state" -o "$card_application_state" = "illegal" ]; then
+                       echo "SIM in illegal state - Power-cycling SIM"
+
+                       # Try to reset SIM application
+                       uqmi -d "$device" --uim-power-off --uim-slot 1
+                       sleep 3
+                       uqmi -d "$device" --uim-power-on --uim-slot 1
+
+                       if [ "$uim_state_timeout" -lt "$timeout" ] || [ "$timeout" = "0" ]; then
+                               let uim_state_timeout++
+                               sleep 1
+                               continue
+                       fi
+
+                       # Recovery failed
+                       proto_notify_error "$interface" SIM_ILLEGAL_STATE
+                       proto_block_restart "$interface"
+                       return 1
+               else
+                       break
+               fi
+       done
+
        if uqmi -s -d "$device" --uim-get-sim-state | grep -q '"Not supported"\|"Invalid QMI command"' &&
           uqmi -s -d "$device" --get-pin-status | grep -q '"Not supported"\|"Invalid QMI command"' ; then
                [ -n "$pincode" ] && {