Get the correct USB VID/PID information for /dev/input/js* devices

src/core/linux/SDL_udev.c

@@ -228,6 +228,62 @@ SDL_UDEV_Scan(void)
     _this->syms.udev_enumerate_unref(enumerate);
 }
 
+SDL_bool
+SDL_UDEV_GetProductInfo(const char *device_path, Uint16 *vendor, Uint16 *product, Uint16 *version)
+{
+    struct udev_enumerate *enumerate = NULL;
+    struct udev_list_entry *devs = NULL;
+    struct udev_list_entry *item = NULL;
+    SDL_bool found = SDL_FALSE;
+
+    if (_this == NULL) {
+        return SDL_FALSE;
+    }
+
+    enumerate = _this->syms.udev_enumerate_new(_this->udev);
+    if (enumerate == NULL) {
+        SDL_SetError("udev_enumerate_new() failed");
+        return SDL_FALSE;
+    }
+
+    _this->syms.udev_enumerate_scan_devices(enumerate);
+    devs = _this->syms.udev_enumerate_get_list_entry(enumerate);
+    for (item = devs; item && !found; item = _this->syms.udev_list_entry_get_next(item)) {
+        const char *path = _this->syms.udev_list_entry_get_name(item);
+        struct udev_device *dev = _this->syms.udev_device_new_from_syspath(_this->udev, path);
+        if (dev != NULL) {
+            const char *val = NULL;
+            const char *existing_path;
+
+            existing_path = _this->syms.udev_device_get_devnode(dev);
+            if (existing_path && SDL_strcmp(device_path, existing_path) == 0) {
+                found = SDL_TRUE;
+
+                val = _this->syms.udev_device_get_property_value(dev, "ID_VENDOR_ID");
+                if (val != NULL) {
+                    *vendor = (Uint16)SDL_strtol(val, NULL, 16);
+                }
+
+                val = _this->syms.udev_device_get_property_value(dev, "ID_MODEL_ID");
+                if (val != NULL) {
+                    *product = (Uint16)SDL_strtol(val, NULL, 16);
+                }
+
+                val = _this->syms.udev_device_get_property_value(dev, "ID_REVISION");
+                if (val != NULL) {
+                    *version = (Uint16)SDL_strtol(val, NULL, 16);
+                }
+            }
+            _this->syms.udev_device_unref(dev);
+        }
+    }
+    _this->syms.udev_enumerate_unref(enumerate);
+
+    return found;
+}
+
+
+
 
 void
 SDL_UDEV_UnloadLibrary(void)
@@ -381,7 +437,7 @@ device_event(SDL_UDEV_deviceevent type, struct udev_device *dev)
         if (SDL_GetHintBoolean(SDL_HINT_ACCELEROMETER_AS_JOYSTICK, SDL_TRUE) &&
             val != NULL && SDL_strcmp(val, "1") == 0 ) {
             devclass |= SDL_UDEV_DEVICE_JOYSTICK;
-	}
+        }
 
         val = _this->syms.udev_device_get_property_value(dev, "ID_INPUT_MOUSE");
         if (val != NULL && SDL_strcmp(val, "1") == 0 ) {
@@ -505,7 +561,6 @@ SDL_UDEV_DelCallback(SDL_UDEV_Callback cb)
         }
         prev = item;
     }
-    
 }
 
 const SDL_UDEV_Symbols *

src/core/linux/SDL_udev.h

@@ -101,6 +101,7 @@ extern void SDL_UDEV_UnloadLibrary(void);
 extern int SDL_UDEV_LoadLibrary(void);
 extern void SDL_UDEV_Poll(void);
 extern void SDL_UDEV_Scan(void);
+extern SDL_bool SDL_UDEV_GetProductInfo(const char *device_path, Uint16 *vendor, Uint16 *product, Uint16 *version);
 extern int SDL_UDEV_AddCallback(SDL_UDEV_Callback cb);
 extern void SDL_UDEV_DelCallback(SDL_UDEV_Callback cb);
 extern const SDL_UDEV_Symbols *SDL_UDEV_GetUdevSyms(void);

src/joystick/linux/SDL_sysjoystick.c

@@ -178,7 +178,7 @@ GuessIsJoystick(int fd)
 }
 
 static int
-IsJoystick(int fd, char **name_return, SDL_JoystickGUID *guid)
+IsJoystick(const char *path, int fd, char **name_return, SDL_JoystickGUID *guid)
 {
     struct input_id inpid;
     Uint16 *guid16 = (Uint16 *)guid->data;
@@ -187,6 +187,9 @@ IsJoystick(int fd, char **name_return, SDL_JoystickGUID *guid)
 
     if (ioctl(fd, JSIOCGNAME(sizeof(product_string)), product_string) >= 0) {
         SDL_zero(inpid);
+#if SDL_USE_LIBUDEV
+        SDL_UDEV_GetProductInfo(path, &inpid.vendor, &inpid.product, &inpid.version);
+#endif
     } else {
         /* When udev is enabled we only get joystick devices here, so there's no need to test them */
         if (enumeration_method != ENUMERATION_LIBUDEV && !GuessIsJoystick(fd)) {
@@ -326,7 +329,7 @@ MaybeAddDevice(const char *path)
     SDL_Log("Checking %s\n", path);
 #endif
 
-    isstick = IsJoystick(fd, &name, &guid);
+    isstick = IsJoystick(path, fd, &name, &guid);
     close(fd);
     if (!isstick) {
         return -1;