[PATCH] mm-broadband-modem-mbim: support hot swapping

[Eric Caruso]

If an MBIM modem supports unsolicited notifications for
subscriber ready status, we can use it to detect when SIM cards
have been removed and reinserted. Upon detection we should re-
probe the modem so that we can configure it for the new SIM.
---
 src/mm-broadband-modem-mbim.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/mm-broadband-modem-mbim.c b/src/mm-broadband-modem-mbim.c
index 0d1126d4..c95255d9 100644
--- a/src/mm-broadband-modem-mbim.c
+++ b/src/mm-broadband-modem-mbim.c
@@ -88,6 +88,9 @@ struct _MMBroadbandModemMbimPrivate {
     /* Access technology updates */
     MbimDataClass available_data_classes;
     MbimDataClass highest_available_data_class;
+
+    /* For checking whether the SIM has been hot swapped */
+    MbimSubscriberReadyState last_ready_state;
 };
 
 /*****************************************************************************/
@@ -2041,8 +2044,18 @@ basic_connect_notification_subscriber_ready_status (MMBroadbandModemMbim *self,
     if (ready_state == MBIM_SUBSCRIBER_READY_STATE_INITIALIZED)
         mm_iface_modem_update_own_numbers (MM_IFACE_MODEM (self), telephone_numbers);
 
-    /* TODO: handle SIM removal using MBIM_SUBSCRIBER_READY_STATE_SIM_NOT_INSERTED */
+    if (self->priv->last_ready_state != MBIM_SUBSCRIBER_READY_STATE_SIM_NOT_INSERTED &&
+        ready_state == MBIM_SUBSCRIBER_READY_STATE_SIM_NOT_INSERTED) {
+        /* SIM has been removed */
+        mm_iface_modem_update_failed_state (MM_IFACE_MODEM (self),
+                                            MM_MODEM_STATE_FAILED_REASON_SIM_MISSING);
+    } else if (self->priv->last_ready_state == MBIM_SUBSCRIBER_READY_STATE_SIM_NOT_INSERTED &&
+               ready_state != MBIM_SUBSCRIBER_READY_STATE_SIM_NOT_INSERTED) {
+        /* SIM has been reinserted */
+        mm_broadband_modem_update_sim_hot_swap_detected (MM_BROADBAND_MODEM (self));
+    }
 
+    self->priv->last_ready_state = ready_state;
     g_strfreev (telephone_numbers);
 }
 
@@ -3165,6 +3178,7 @@ mm_broadband_modem_mbim_new (const gchar *device,
                          MM_BASE_MODEM_PLUGIN, plugin,
                          MM_BASE_MODEM_VENDOR_ID, vendor_id,
                          MM_BASE_MODEM_PRODUCT_ID, product_id,
+                         MM_IFACE_MODEM_SIM_HOT_SWAP_SUPPORTED, TRUE,
                          NULL);
 }
 
-- 
2.12.2