Add a config option 'EnableWattsUpPro' to disable the Watts Up Pro device

Annoyingly, the device used in the Watts Up Pro device seems to be a generic
USB->serial adaptor, which means it doesn't have a unique vendor and product
ID. If we try to probe for the WUP device, we can actually upset other devices
that are not expecing to be probed. This fixes #33846 although we actually
still need to be more strict in detecting a true WUP device.

5 files changed, 207 insertions, 38 deletions

diff --git a/etc/UPower.conf b/etc/UPower.conf
index c82827a..ca120dc 100644
--- a/etc/UPower.conf
+++ b/etc/UPower.conf
@@ -20,6 +20,20 @@ SleepTimeout=1000
 # default=true
 AllowHibernateEncryptedSwap=true
 
+# Enable the Watts Up Pro device.
+#
+# The Watts Up Pro contains a generic FTDI USB device without a specific
+# vendor and product ID. When we probe for WUP devices, we can cause
+# the user to get a perplexing "Device or resource busy" error when
+# attempting to use their non-WUP device.
+#
+# The generic FTDI device is known to also be used on:
+#
+# - Sparkfun FT232 breakout board
+# - Parallax Propeller
+#
+# default=true
+EnableWattsUpPro=true
 
 # Poll the kernel for dock state changes.
 #
diff --git a/src/Makefile.am b/src/Makefile.am
index 1cb9050..51c6948 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -76,6 +76,8 @@ upowerd_SOURCES =						\
 	up-device-list.c					\
 	up-qos.h						\
 	up-qos.c						\
+	up-config.h						\
+	up-config.c						\
 	up-kbd-backlight.h					\
 	up-kbd-backlight.c					\
 	up-wakeups.h						\
diff --git a/src/linux/up-backend.c b/src/linux/up-backend.c
index 069ca9b..14435be 100644
--- a/src/linux/up-backend.c
+++ b/src/linux/up-backend.c
@@ -40,6 +40,7 @@
 #include "up-device-hid.h"
 #include "up-input.h"
 #include "up-dock.h"
+#include "up-config.h"
 #ifdef HAVE_IDEVICE
 #include "up-device-idevice.h"
 #endif /* HAVE_IDEVICE */
@@ -57,6 +58,7 @@ struct UpBackendPrivate
 	GUdevClient		*gudev_client;
 	UpDeviceList		*managed_devices;
 	UpDock			*dock;
+	UpConfig		*config;
 };
 
 enum {
@@ -105,11 +107,15 @@ up_backend_device_new (UpBackend *backend, GUdevDevice *native)
 	} else if (g_strcmp0 (subsys, "tty") == 0) {
 
 		/* try to detect a Watts Up? Pro monitor */
-		device = UP_DEVICE (up_device_wup_new ());
-		ret = up_device_coldplug (device, backend->priv->daemon, G_OBJECT (native));
-		if (ret)
-			goto out;
-		g_object_unref (device);
+		ret = up_config_get_boolean (backend->priv->config,
+					     "EnableWattsUpPro");
+		if (ret) {
+			device = UP_DEVICE (up_device_wup_new ());
+			ret = up_device_coldplug (device, backend->priv->daemon, G_OBJECT (native));
+			if (ret)
+				goto out;
+			g_object_unref (device);
+		}
 
 		/* no valid TTY object */
 		device = NULL;
@@ -284,38 +290,6 @@ up_backend_uevent_signal_handler_cb (GUdevClient *client, const gchar *action,
 }
 
 /**
- * up_backend_should_poll_docks:
- **/
-static gboolean
-up_backend_should_poll_docks (void)
-{
-	gboolean ret;
-	GKeyFile *keyfile;
-	GError *error = NULL;
-
-	/* get the settings from the config file */
-	keyfile = g_key_file_new ();
-	ret = g_key_file_load_from_file (keyfile,
-					 PACKAGE_SYSCONF_DIR "/UPower/UPower.conf",
-					 G_KEY_FILE_NONE,
-					 &error);
-	if (!ret) {
-		g_error ("Failed to get poll setting, assuming FALSE: %s",
-			   error->message);
-		g_error_free (error);
-		goto out;
-	}
-	ret = g_key_file_get_boolean (keyfile,
-				      "UPower",
-				      "PollDockDevices",
-				      NULL);
-	g_debug ("Polling docks: %s", ret ? "YES" : "NO");
-out:
-	g_key_file_free (keyfile);
-	return ret;
-}
-
-/**
  * up_backend_coldplug:
  * @backend: The %UpBackend class instance
  * @daemon: The %UpDaemon controlling instance
@@ -355,7 +329,8 @@ up_backend_coldplug (UpBackend *backend, UpDaemon *daemon)
 
 	/* add dock update object */
 	backend->priv->dock = up_dock_new ();
-	ret = up_backend_should_poll_docks ();
+	ret = up_config_get_boolean (backend->priv->config, "PollDockDevices");
+	g_debug ("Polling docks: %s", ret ? "YES" : "NO");
 	up_dock_set_should_poll (backend->priv->dock, ret);
 	ret = up_dock_coldplug (backend->priv->dock, daemon);
 	if (!ret)
@@ -643,6 +618,7 @@ static void
 up_backend_init (UpBackend *backend)
 {
 	backend->priv = UP_BACKEND_GET_PRIVATE (backend);
+	backend->priv->config = up_config_new ();
 	backend->priv->daemon = NULL;
 	backend->priv->device_list = NULL;
 	backend->priv->managed_devices = up_device_list_new ();
@@ -660,6 +636,7 @@ up_backend_finalize (GObject *object)
 
 	backend = UP_BACKEND (object);
 
+	g_object_unref (backend->priv->config);
 	if (backend->priv->daemon != NULL)
 		g_object_unref (backend->priv->daemon);
 	if (backend->priv->device_list != NULL)
diff --git a/src/up-config.c b/src/up-config.c
new file mode 100644
index 0000000..1d92f07
--- /dev/null
+++ b/src/up-config.c
@@ -0,0 +1,120 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2011 Richard Hughes <richard@hughsie.com>
+ *
+ * Licensed under the GNU General Public License Version 2
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+
+#include <glib-object.h>
+#include <gio/gio.h>
+
+#include "up-config.h"
+
+static void     up_config_finalize	(GObject     *object);
+
+#define UP_CONFIG_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), UP_TYPE_CONFIG, UpConfigPrivate))
+
+/**
+ * UpConfigPrivate:
+ *
+ * Private #UpConfig data
+ **/
+struct _UpConfigPrivate
+{
+	GKeyFile			*keyfile;
+};
+
+G_DEFINE_TYPE (UpConfig, up_config, G_TYPE_OBJECT)
+
+static gpointer up_config_object = NULL;
+
+/**
+ * up_config_get_boolean:
+ **/
+gboolean
+up_config_get_boolean (UpConfig *config, const gchar *key)
+{
+	return g_key_file_get_boolean (config->priv->keyfile,
+				       "UPower", key, NULL);
+}
+
+/**
+ * up_config_class_init:
+ **/
+static void
+up_config_class_init (UpConfigClass *klass)
+{
+	GObjectClass *object_class = G_OBJECT_CLASS (klass);
+	object_class->finalize = up_config_finalize;
+	g_type_class_add_private (klass, sizeof (UpConfigPrivate));
+}
+
+/**
+ * up_config_init:
+ **/
+static void
+up_config_init (UpConfig *config)
+{
+	gboolean ret;
+	GError *error = NULL;
+
+	config->priv = UP_CONFIG_GET_PRIVATE (config);
+	config->priv->keyfile = g_key_file_new ();
+
+	/* load */
+	ret = g_key_file_load_from_file (config->priv->keyfile,
+					 PACKAGE_SYSCONF_DIR "/UPower/UPower.conf",
+					 G_KEY_FILE_NONE,
+					 &error);
+	if (!ret) {
+		g_warning ("failed to load config file: %s",
+			   error->message);
+		g_error_free (error);
+	}
+}
+
+/**
+ * up_config_finalize:
+ **/
+static void
+up_config_finalize (GObject *object)
+{
+	UpConfig *config = UP_CONFIG (object);
+	UpConfigPrivate *priv = config->priv;
+
+	g_key_file_free (priv->keyfile);
+
+	G_OBJECT_CLASS (up_config_parent_class)->finalize (object);
+}
+
+/**
+ * up_config_new:
+ **/
+UpConfig *
+up_config_new (void)
+{
+	if (up_config_object != NULL) {
+		g_object_ref (up_config_object);
+	} else {
+		up_config_object = g_object_new (UP_TYPE_CONFIG, NULL);
+		g_object_add_weak_pointer (up_config_object, &up_config_object);
+	}
+	return UP_CONFIG (up_config_object);
+}
+
diff --git a/src/up-config.h b/src/up-config.h
new file mode 100644
index 0000000..2622509
--- /dev/null
+++ b/src/up-config.h
@@ -0,0 +1,56 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2011 Richard Hughes <richard@hughsie.com>
+ *
+ * Licensed under the GNU General Public License Version 2
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef __UP_CONFIG_H
+#define __UP_CONFIG_H
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define UP_TYPE_CONFIG		(up_config_get_type ())
+#define UP_CONFIG(o)		(G_TYPE_CHECK_INSTANCE_CAST ((o), UP_TYPE_CONFIG, UpConfig))
+#define UP_CONFIG_CLASS(k)	(G_TYPE_CHECK_CLASS_CAST((k), UP_TYPE_CONFIG, UpConfigClass))
+#define UP_IS_CONFIG(o)		(G_TYPE_CHECK_INSTANCE_TYPE ((o), UP_TYPE_CONFIG))
+
+typedef struct _UpConfigPrivate		UpConfigPrivate;
+typedef struct _UpConfig		UpConfig;
+typedef struct _UpConfigClass		UpConfigClass;
+
+struct _UpConfig
+{
+	 GObject		 parent;
+	 UpConfigPrivate	*priv;
+};
+
+struct _UpConfigClass
+{
+	GObjectClass		 parent_class;
+};
+
+GType		 up_config_get_type		(void);
+UpConfig	*up_config_new			(void);
+gboolean	 up_config_get_boolean		(UpConfig	*config,
+						 const gchar	*key);
+
+G_END_DECLS
+
+#endif /* __UP_CONFIG_H */