ublox: rework support config loading

Make mm_ublox_get_support_config() return FALSE only when GError is
set. And also, prepare a preload_support_config() method to be run
before using any information from the support configuration (i.e.
don't do it in load_supported_bands(), do it in load_current_bands()
or in set_current_bands().

3 files changed, 95 insertions, 29 deletions

diff --git a/plugins/ublox/mm-broadband-modem-ublox.c b/plugins/ublox/mm-broadband-modem-ublox.c
index 8cc0ee44b..7ca433358 100644
--- a/plugins/ublox/mm-broadband-modem-ublox.c
+++ b/plugins/ublox/mm-broadband-modem-ublox.c
@@ -72,6 +72,67 @@ struct _MMBroadbandModemUbloxPrivate {
 };
 
 /*****************************************************************************/
+/* Per-model configuration loading */
+
+static void
+preload_support_config (MMBroadbandModemUblox *self)
+{
+    const gchar *model;
+    GError      *error = NULL;
+
+    /* Make sure we load only once */
+    if (self->priv->support_config.loaded)
+        return;
+
+    model = mm_iface_modem_get_model (MM_IFACE_MODEM (self));
+
+    if (!mm_ublox_get_support_config (model, &self->priv->support_config, &error)) {
+        mm_warn ("loading support configuration failed: %s", error->message);
+        g_error_free (error);
+
+        /* default to NOT SUPPORTED if unknown model */
+        self->priv->support_config.method = BAND_UPDATE_NEEDS_UNKNOWN;
+        self->priv->support_config.uact = FEATURE_UNSUPPORTED;
+        self->priv->support_config.ubandsel = FEATURE_UNSUPPORTED;
+    } else
+        mm_dbg ("support configuration found for '%s'", model);
+
+    switch (self->priv->support_config.method) {
+        case BAND_UPDATE_NEEDS_CFUN:
+            mm_dbg ("  band update requires low-power mode");
+            break;
+        case BAND_UPDATE_NEEDS_COPS:
+            mm_dbg ("  band update requires explicit unregistration");
+            break;
+        case BAND_UPDATE_NEEDS_UNKNOWN:
+            /* not an error, this just means we don't need anything special */
+            break;
+    }
+
+    switch (self->priv->support_config.uact) {
+        case FEATURE_SUPPORTED:
+            mm_dbg ("  UACT based band configuration supported");
+            break;
+        case FEATURE_UNSUPPORTED:
+            mm_dbg ("  UACT based band configuration unsupported");
+            break;
+        case FEATURE_SUPPORT_UNKNOWN:
+            g_assert_not_reached();
+    }
+
+    switch (self->priv->support_config.ubandsel) {
+        case FEATURE_SUPPORTED:
+            mm_dbg ("  UBANDSEL based band configuration supported");
+            break;
+        case FEATURE_UNSUPPORTED:
+            mm_dbg ("  UBANDSEL based band configuration unsupported");
+            break;
+        case FEATURE_SUPPORT_UNKNOWN:
+            g_assert_not_reached();
+    }
+}
+
+/*****************************************************************************/
 
 static gboolean
 acquire_power_operation (MMBroadbandModemUblox  *self,
@@ -105,22 +166,20 @@ load_supported_bands_finish (MMIfaceModem  *self,
 }
 
 static void
-load_supported_bands (MMIfaceModem        *_self,
+load_supported_bands (MMIfaceModem        *self,
                       GAsyncReadyCallback  callback,
                       gpointer             user_data)
 {
-    MMBroadbandModemUblox *self = MM_BROADBAND_MODEM_UBLOX (_self);
-    GTask                 *task;
-    GError                *error = NULL;
-    GArray                *bands = NULL;
-    const gchar           *model;
-
-    model = mm_iface_modem_get_model (_self);
+    GTask       *task;
+    GError      *error = NULL;
+    GArray      *bands = NULL;
+    const gchar *model;
 
+    model = mm_iface_modem_get_model (MM_BROADBAND_MODEM_UBLOX (self));
     task  = g_task_new (_self, NULL, callback, user_data);
 
     bands = mm_ublox_get_supported_bands (model, &error);
-    if (!bands || !mm_ublox_get_support_config (model, &self->priv->support_config, &error))
+    if (!bands)
         g_task_return_error (task, error);
     else
         g_task_return_pointer (task, bands, (GDestroyNotify) g_array_unref);
@@ -157,8 +216,7 @@ load_current_bands (MMIfaceModem        *_self,
 {
     MMBroadbandModemUblox *self = MM_BROADBAND_MODEM_UBLOX (_self);
 
-    g_assert (self->priv->support_config.uact != FEATURE_SUPPORT_UNKNOWN &&
-              self->priv->support_config.ubandsel != FEATURE_SUPPORT_UNKNOWN);
+    preload_support_config (self);
 
     if (self->priv->support_config.ubandsel == FEATURE_SUPPORTED) {
         mm_base_modem_at_command (
@@ -451,6 +509,8 @@ set_current_modes (MMIfaceModem        *self,
     gchar  *command;
     GError *error = NULL;
 
+    preload_support_config (MM_BROADBAND_MODEM_UBLOX (self));
+
     task = g_task_new (self, NULL, callback, user_data);
 
     /* Handle ANY */
@@ -481,6 +541,8 @@ set_current_bands (MMIfaceModem        *_self,
     gchar                 *command;
     const gchar           *model;
 
+    preload_support_config (self);
+
     task = g_task_new (self, NULL, callback, user_data);
 
     model = mm_iface_modem_get_model (_self);
@@ -1265,6 +1327,7 @@ mm_broadband_modem_ublox_init (MMBroadbandModemUblox *self)
     self->priv->profile = MM_UBLOX_USB_PROFILE_UNKNOWN;
     self->priv->mode = MM_UBLOX_NETWORKING_MODE_UNKNOWN;
     self->priv->any_allowed = MM_MODEM_MODE_NONE;
+    self->priv->support_config.loaded   = FALSE;
     self->priv->support_config.method   = BAND_UPDATE_NEEDS_UNKNOWN;
     self->priv->support_config.uact     = FEATURE_SUPPORT_UNKNOWN;
     self->priv->support_config.ubandsel = FEATURE_SUPPORT_UNKNOWN;
diff --git a/plugins/ublox/mm-modem-helpers-ublox.c b/plugins/ublox/mm-modem-helpers-ublox.c
index 1fc598bf0..702992b3d 100644
--- a/plugins/ublox/mm-modem-helpers-ublox.c
+++ b/plugins/ublox/mm-modem-helpers-ublox.c
@@ -926,30 +926,32 @@ static const BandConfiguration band_configuration[] = {
     },
 };
 
-/* Returns AT command support configuration */
-
-gboolean mm_ublox_get_support_config (const gchar         *model,
-                                      UbloxSupportConfig  *config,
-                                      GError             **error) 
+gboolean
+mm_ublox_get_support_config (const gchar         *model,
+                             UbloxSupportConfig  *config,
+                             GError             **error)
 {
     guint i;
 
-    if (model) {
-        for (i = 0; i < G_N_ELEMENTS (band_configuration); i++)
-            if (g_str_has_prefix (model, band_configuration[i].model)) {
-                config->method   = band_configuration[i].method;
-                config->uact     = band_configuration[i].uact;
-                config->ubandsel = band_configuration[i].ubandsel;
-                return TRUE;
-            }
-    }
-
-    if (i == G_N_ELEMENTS (band_configuration) || !(model)) {
+    if (!model) {
         g_set_error (error, MM_CORE_ERROR, MM_CORE_ERROR_FAILED,
-                     "Unknown support found for modem: %s", model);
+                     "Support configuration unknown for unknown model");
         return FALSE;
     }
- 
+
+    for (i = 0; i < G_N_ELEMENTS (band_configuration); i++) {
+        /* NOTE: matching by prefix! */
+        if (g_str_has_prefix (model, band_configuration[i].model)) {
+            config->loaded   = TRUE;
+            config->method   = band_configuration[i].method;
+            config->uact     = band_configuration[i].uact;
+            config->ubandsel = band_configuration[i].ubandsel;
+            return TRUE;
+        }
+    }
+
+    g_set_error (error, MM_CORE_ERROR, MM_CORE_ERROR_FAILED,
+                 "No support configuration found for modem: %s", model);
     return FALSE;
 }
 
diff --git a/plugins/ublox/mm-modem-helpers-ublox.h b/plugins/ublox/mm-modem-helpers-ublox.h
index 4a0eec1e1..1531552cd 100644
--- a/plugins/ublox/mm-modem-helpers-ublox.h
+++ b/plugins/ublox/mm-modem-helpers-ublox.h
@@ -35,6 +35,7 @@ typedef enum {
 } UpdateMethod;
 
 typedef struct UbloxSupportConfig {
+    gboolean       loaded;
     UpdateMethod   method;
     FeatureSupport uact;
     FeatureSupport ubandsel;