sierra: implement PIN/PUK retry count loading

Not all Sierra modems support it, but those which do reply like this:

    AT+CPINC=?
    OK

    AT+CPINC?
    +CPINC: 3,3,10,10

1 files changed, 61 insertions, 0 deletions

diff --git a/plugins/sierra/mm-broadband-modem-sierra.c b/plugins/sierra/mm-broadband-modem-sierra.c
index e70d4b02..5c894f64 100644
--- a/plugins/sierra/mm-broadband-modem-sierra.c
+++ b/plugins/sierra/mm-broadband-modem-sierra.c
@@ -59,6 +59,65 @@ struct _MMBroadbandModemSierraPrivate {
 };
 
 /*****************************************************************************/
+/* Load unlock retries (Modem interface) */
+
+static MMUnlockRetries *
+load_unlock_retries_finish (MMIfaceModem *self,
+                            GAsyncResult *res,
+                            GError **error)
+{
+    MMUnlockRetries *unlock_retries;
+    const gchar *response;
+    gint matched;
+    guint a, b, c ,d;
+
+    response = mm_base_modem_at_command_finish (MM_BASE_MODEM (self), res, error);
+    if (!response)
+        return NULL;
+
+    matched = sscanf (response, "+CPINC: %d,%d,%d,%d",
+                      &a, &b, &c, &d);
+    if (matched != 4) {
+        g_set_error (error,
+                     MM_CORE_ERROR,
+                     MM_CORE_ERROR_FAILED,
+                     "Could not parse PIN retries results: '%s'",
+                     response);
+        return NULL;
+    }
+
+    if (a > 998) {
+        g_set_error (error,
+                     MM_CORE_ERROR,
+                     MM_CORE_ERROR_FAILED,
+                     "Invalid PIN attempts left: '%u'",
+                     a);
+        return NULL;
+    }
+
+    unlock_retries = mm_unlock_retries_new ();
+    mm_unlock_retries_set (unlock_retries, MM_MODEM_LOCK_SIM_PIN, a);
+    mm_unlock_retries_set (unlock_retries, MM_MODEM_LOCK_SIM_PIN2, b);
+    mm_unlock_retries_set (unlock_retries, MM_MODEM_LOCK_SIM_PUK, c);
+    mm_unlock_retries_set (unlock_retries, MM_MODEM_LOCK_SIM_PUK2, d);
+    return unlock_retries;
+}
+
+static void
+load_unlock_retries (MMIfaceModem *self,
+                     GAsyncReadyCallback callback,
+                     gpointer user_data)
+{
+    mm_dbg ("loading unlock retries (sierra)...");
+    mm_base_modem_at_command (MM_BASE_MODEM (self),
+                              "+CPINC?",
+                              3,
+                              FALSE,
+                              callback,
+                              user_data);
+}
+
+/*****************************************************************************/
 /* Generic AT!STATUS parsing */
 
 typedef enum {
@@ -1515,6 +1574,8 @@ iface_modem_init (MMIfaceModem *iface)
     iface->modem_power_down_finish = modem_power_down_finish;
     iface->create_sim = mm_common_sierra_create_sim;
     iface->create_sim_finish = mm_common_sierra_create_sim_finish;
+    iface->load_unlock_retries = load_unlock_retries;
+    iface->load_unlock_retries_finish = load_unlock_retries_finish;
     iface->modem_after_sim_unlock = modem_after_sim_unlock;
     iface->modem_after_sim_unlock_finish = modem_after_sim_unlock_finish;
     iface->create_bearer = modem_create_bearer;