From 2722f3f337f2a0b6b7d01f4c45a362d75f779664 Mon Sep 17 00:00:00 2001
From: Gabriel Corona <gabriel.corona@enst-bretagne.fr>
Date: Sun, 2 Aug 2015 01:29:06 +0200
Subject: [PATCH] Stable device identifier for evdev

---
 .../ControllerInterface/evdev/evdev.cpp       | 23 ++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/Source/Core/InputCommon/ControllerInterface/evdev/evdev.cpp b/Source/Core/InputCommon/ControllerInterface/evdev/evdev.cpp
index 25fa21a74b..e7a0ae2525 100644
--- a/Source/Core/InputCommon/ControllerInterface/evdev/evdev.cpp
+++ b/Source/Core/InputCommon/ControllerInterface/evdev/evdev.cpp
@@ -15,8 +15,28 @@ namespace ciface
 namespace evdev
 {
 
+static std::string GetName(const std::string& devnode)
+{
+	int fd = open(devnode.c_str(), O_RDWR|O_NONBLOCK);
+	libevdev* dev = nullptr;
+	int ret = libevdev_new_from_fd(fd, &dev);
+	if (ret != 0)
+	{
+		close(fd);
+		return std::string();
+	}
+	std::string res = libevdev_get_name(dev);
+	libevdev_free(dev);
+	close(fd);
+	return std::move(res);
+}
+
 void Init(std::vector<Core::Device*> &controllerDevices)
 {
+	// this is used to number the joysticks
+	// multiple joysticks with the same name shall get unique ids starting at 0
+	std::map<std::string, int> name_counts;
+
 	int num_controllers = 0;
 
 	// We use Udev to find any devices. In the future this will allow for hotplugging.
@@ -46,7 +66,8 @@ void Init(std::vector<Core::Device*> &controllerDevices)
 		{
 			// Unfortunately udev gives us no way to filter out the non event device interfaces.
 			// So we open it and see if it works with evdev ioctls or not.
-			evdevDevice* input = new evdevDevice(devnode, num_controllers);
+			std::string name = GetName(devnode);
+			evdevDevice* input = new evdevDevice(devnode, name_counts[name]++);
 
 			if (input->IsInteresting())
 			{