From ded106fe31a47eee387fdf37bb7be39c03c1b97c Mon Sep 17 00:00:00 2001
From: Torsten Dreyer <Torsten@t3r.de>
Date: Sat, 3 Dec 2011 22:59:20 +0100
Subject: [PATCH] event input for Linux: substitude dbus+hal by udev

---
 src/Input/FGLinuxEventInput.cxx | 100 ++++++++------------------------
 src/Input/FGLinuxEventInput.hxx |   4 --
 2 files changed, 23 insertions(+), 81 deletions(-)

diff --git a/src/Input/FGLinuxEventInput.cxx b/src/Input/FGLinuxEventInput.cxx
index e41f6e195..a5e825b10 100644
--- a/src/Input/FGLinuxEventInput.cxx
+++ b/src/Input/FGLinuxEventInput.cxx
@@ -25,15 +25,11 @@
 #include <cstring>
 #include <sys/types.h>
 #include <sys/stat.h>
-#include <poll.h>
-#include <linux/input.h>
-#include <dbus/dbus.h>
-#include <fcntl.h>
 #include "FGLinuxEventInput.hxx"
 
+#include <libudev.h>
 #include <poll.h>
 #include <linux/input.h>
-#include <dbus/dbus.h>
 #include <fcntl.h>
 
 #include <string.h>
@@ -445,92 +441,42 @@ void FGLinuxInputDevice::SetDevname( std::string name )
   this->devname = name; 
 }
 
-FGLinuxEventInput::FGLinuxEventInput() : 
-  halcontext(NULL)
+FGLinuxEventInput::FGLinuxEventInput()
 {
 }
 
 FGLinuxEventInput::~FGLinuxEventInput()
 {
-  if( halcontext != NULL ) {
-    libhal_ctx_shutdown( halcontext, NULL);
-    libhal_ctx_free( halcontext );
-    halcontext = NULL;
-  }
 }
 
-#if 0
-//TODO: enable hotplug support
-static void DeviceAddedCallback (LibHalContext *ctx, const char *udi)
-{
-  FGLinuxEventInput * linuxEventInput = (FGLinuxEventInput*)libhal_ctx_get_user_data (ctx);
-  linuxEventInput->AddHalDevice( udi );
-}
-
-static void DeviceRemovedCallback (LibHalContext *ctx, const char *udi)
-{
-}
-#endif
-
 void FGLinuxEventInput::postinit()
 {
   FGEventInput::postinit();
 
-  DBusConnection * connection;
-  DBusError dbus_error;
+  struct udev * udev = udev_new();
 
-  dbus_error_init(&dbus_error);
-  connection = dbus_bus_get (DBUS_BUS_SYSTEM, &dbus_error);
-  if (dbus_error_is_set(&dbus_error)) {
-    SG_LOG( SG_INPUT, SG_ALERT, "Can't connect to system bus " << dbus_error.message);
-    dbus_error_free (&dbus_error);
-    return;
+  struct udev_enumerate *enumerate = udev_enumerate_new(udev);
+  udev_enumerate_add_match_subsystem(enumerate, "input");
+  udev_enumerate_scan_devices(enumerate);
+  struct udev_list_entry *devices = udev_enumerate_get_list_entry(enumerate);
+  struct udev_list_entry *dev_list_entry;
+
+  udev_list_entry_foreach(dev_list_entry, devices) {
+    const char * path = udev_list_entry_get_name(dev_list_entry);
+    struct udev_device *dev = udev_device_new_from_syspath(udev, path);
+    const char * node = udev_device_get_devnode(dev);
+ 
+    dev = udev_device_get_parent( dev );
+    const char * name = udev_device_get_sysattr_value(dev,"name");
+
+    SG_LOG(SG_INPUT,SG_ALERT, "name=" << (name?name:"<null>") << ", node=" << (node?node:"<null>"));
+    if( name && node )
+      AddDevice( new FGLinuxInputDevice(name, node) );
+
+    udev_device_unref(dev);
   }
 
-  halcontext = libhal_ctx_new();
-
-  libhal_ctx_set_dbus_connection (halcontext, connection );
-  dbus_error_init (&dbus_error);
-
-  if( libhal_ctx_init( halcontext,  &dbus_error )) {
-
-      int num_devices = 0;
-      char ** devices = libhal_find_device_by_capability(halcontext, "input", &num_devices, NULL);
-
-      for ( int i = 0; i < num_devices; i++)
-        AddHalDevice( devices[i] );
-
-      libhal_free_string_array (devices);
-
-//TODO: enable hotplug support
-//      libhal_ctx_set_user_data( halcontext, this );
-//      libhal_ctx_set_device_added( halcontext, DeviceAddedCallback );
-//      libhal_ctx_set_device_removed( halcontext, DeviceRemovedCallback );
-    } else {
-      if(dbus_error_is_set (&dbus_error) ) {
-        SG_LOG( SG_INPUT, SG_ALERT, "Can't connect to hald: " << dbus_error.message);
-        dbus_error_free (&dbus_error);
-      } else {
-        SG_LOG( SG_INPUT, SG_ALERT, "Can't connect to hald." );
-      }
-
-      libhal_ctx_free (halcontext);
-      halcontext = NULL;
-    }
-}
-
-void FGLinuxEventInput::AddHalDevice( const char * udi )
-{
-  char * device = libhal_device_get_property_string( halcontext, udi, "input.device", NULL);
-  char * product = libhal_device_get_property_string( halcontext, udi, "input.product", NULL);
-
-  if( product != NULL && device != NULL ) 
-    AddDevice( new FGLinuxInputDevice(product, device) );
-  else
-    SG_LOG( SG_INPUT, SG_ALERT, "Can't get device or product property of " << udi );
-
-  if( device != NULL ) libhal_free_string( device );
-  if( product != NULL ) libhal_free_string( product );
+  udev_unref(udev);
 
 }
 
diff --git a/src/Input/FGLinuxEventInput.hxx b/src/Input/FGLinuxEventInput.hxx
index f3bfa044f..5fcd81e24 100644
--- a/src/Input/FGLinuxEventInput.hxx
+++ b/src/Input/FGLinuxEventInput.hxx
@@ -25,7 +25,6 @@
 
 #include "FGEventInput.hxx"
 #include <linux/input.h>
-#include <hal/libhal.h>
 
 struct FGLinuxEventData : public FGEventData {
   FGLinuxEventData( struct input_event & event, double dt, int modifiers ) :
@@ -71,10 +70,7 @@ public:
   virtual void update (double dt);
   virtual void postinit();
 
-  void AddHalDevice( const char * udi );
 protected:
-  LibHalContext *halcontext;
-
 };
 
 #endif