Make arguments redo, subproject elimination (#1784)

* redo make args to use colons, better folder structuring system [skip ci]

* don't put spaces after statements - hard lessons in makefile development

* fix-up some other rules.mk

* give travis a chance

* reset KEYMAPS variable

* start converting keyboards to new system

* try making all with travis

* redo make args to use colons, better folder structuring system [skip ci]

* don't put spaces after statements - hard lessons in makefile development

* fix-up some other rules.mk

* give travis a chance

* reset KEYMAPS variable

* start converting keyboards to new system

* try making all with travis

* start to update readmes and keyboards

* look in keyboard directories for board.mk

* update visualizer rules

* fix up some other keyboards/keymaps

* fix arm board ld includes

* fix board rules

* fix up remaining keyboards

* reset layout variable

* reset keyboard_layouts

* fix remainging keymaps/boards

* update readmes, docs

* add note to makefile error

* update readmes

* remove planck keymap warnings

* update references and docs

* test out tarvis build stages

* don't use stages for now

* don't use stages for now

25 files changed, 31 insertions, 148 deletions

diff --git a/keyboards/planck/config.h b/keyboards/planck/config.h
index c8f4377f0..bc7ec031e 100644
--- a/keyboards/planck/config.h
+++ b/keyboards/planck/config.h
@@ -81,6 +81,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //#define NO_ACTION_MACRO
 //#define NO_ACTION_FUNCTION
 
-#include QMK_SUBPROJECT_CONFIG_H
-
 #endif
diff --git a/keyboards/planck/keymaps/impossible/rules.mk b/keyboards/planck/keymaps/impossible/rules.mk
index cf2c31f0f..247a1fd2a 100644
--- a/keyboards/planck/keymaps/impossible/rules.mk
+++ b/keyboards/planck/keymaps/impossible/rules.mk
@@ -1,7 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in 
 #   the appropriate keymap folder that will get included automatically
@@ -20,8 +16,4 @@ BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
\ No newline at end of file
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
\ No newline at end of file
diff --git a/keyboards/planck/keymaps/jeebak/rules.mk b/keyboards/planck/keymaps/jeebak/rules.mk
index cf2c31f0f..247a1fd2a 100644
--- a/keyboards/planck/keymaps/jeebak/rules.mk
+++ b/keyboards/planck/keymaps/jeebak/rules.mk
@@ -1,7 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in 
 #   the appropriate keymap folder that will get included automatically
@@ -20,8 +16,4 @@ BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
\ No newline at end of file
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
\ No newline at end of file
diff --git a/keyboards/planck/keymaps/jhenahan/rules.mk b/keyboards/planck/keymaps/jhenahan/rules.mk
index 83da2a7f8..bb12dd865 100644
--- a/keyboards/planck/keymaps/jhenahan/rules.mk
+++ b/keyboards/planck/keymaps/jhenahan/rules.mk
@@ -1,7 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in 
 #   the appropriate keymap folder that will get included automatically
@@ -20,8 +16,4 @@ BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
\ No newline at end of file
diff --git a/keyboards/planck/keymaps/joe/rules.mk b/keyboards/planck/keymaps/joe/rules.mk
index b2ca41944..247a1fd2a 100644
--- a/keyboards/planck/keymaps/joe/rules.mk
+++ b/keyboards/planck/keymaps/joe/rules.mk
@@ -1,8 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in 
 #   the appropriate keymap folder that will get included automatically
@@ -21,8 +16,4 @@ BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
\ No newline at end of file
diff --git a/keyboards/planck/keymaps/leo/rules.mk b/keyboards/planck/keymaps/leo/rules.mk
index b2ca41944..247a1fd2a 100644
--- a/keyboards/planck/keymaps/leo/rules.mk
+++ b/keyboards/planck/keymaps/leo/rules.mk
@@ -1,8 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in 
 #   the appropriate keymap folder that will get included automatically
@@ -21,8 +16,4 @@ BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
\ No newline at end of file
diff --git a/keyboards/planck/keymaps/lucas/rules.mk b/keyboards/planck/keymaps/lucas/rules.mk
index b2ca41944..247a1fd2a 100644
--- a/keyboards/planck/keymaps/lucas/rules.mk
+++ b/keyboards/planck/keymaps/lucas/rules.mk
@@ -1,8 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in 
 #   the appropriate keymap folder that will get included automatically
@@ -21,8 +16,4 @@ BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
\ No newline at end of file
diff --git a/keyboards/planck/keymaps/mollat/rules.mk b/keyboards/planck/keymaps/mollat/rules.mk
index b2ca41944..be3f69280 100644
--- a/keyboards/planck/keymaps/mollat/rules.mk
+++ b/keyboards/planck/keymaps/mollat/rules.mk
@@ -1,8 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in 
 #   the appropriate keymap folder that will get included automatically
@@ -22,7 +17,3 @@ RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.  Do not enable this
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
 SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
diff --git a/keyboards/planck/keymaps/nico/rules.mk b/keyboards/planck/keymaps/nico/rules.mk
index b2ca41944..247a1fd2a 100644
--- a/keyboards/planck/keymaps/nico/rules.mk
+++ b/keyboards/planck/keymaps/nico/rules.mk
@@ -1,8 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in 
 #   the appropriate keymap folder that will get included automatically
@@ -21,8 +16,4 @@ BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
\ No newline at end of file
diff --git a/keyboards/planck/keymaps/phreed/readme.md b/keyboards/planck/keymaps/phreed/readme.md
index 9080222e2..c8fd93243 100644
--- a/keyboards/planck/keymaps/phreed/readme.md
+++ b/keyboards/planck/keymaps/phreed/readme.md
@@ -28,11 +28,11 @@
 
 Make example for this keyboard (after setting up your build environment):
 
-    make planck-rev3-phreed
+    make planck/rev3:phreed
 
 To flash the keyboard
 
-    make planck-rev3-phreed-dfu
+    make planck/rev3:phreed:dfu
 
 See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the
 [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
diff --git a/keyboards/planck/keymaps/premek/rules.mk b/keyboards/planck/keymaps/premek/rules.mk
index b2ca41944..247a1fd2a 100644
--- a/keyboards/planck/keymaps/premek/rules.mk
+++ b/keyboards/planck/keymaps/premek/rules.mk
@@ -1,8 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in 
 #   the appropriate keymap folder that will get included automatically
@@ -21,8 +16,4 @@ BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
\ No newline at end of file
diff --git a/keyboards/planck/keymaps/pvc/config.h b/keyboards/planck/keymaps/pvc/config.h
index 1004c8b99..17f351756 100644
--- a/keyboards/planck/keymaps/pvc/config.h
+++ b/keyboards/planck/keymaps/pvc/config.h
@@ -15,19 +15,11 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#ifndef CONFIG_H
-#define CONFIG_H
+#ifndef CONFIG_USER_H
+#define CONFIG_USER_H
 
 #include "config_common.h"
 
-/* USB Device descriptor parameter */
-#define VENDOR_ID       0xFEED
-#define PRODUCT_ID      0x6060
-#define DEVICE_VER      0x0001
-#define MANUFACTURER    Ortholinear Keyboards
-#define PRODUCT         The Planck Keyboard
-#define DESCRIPTION     A compact ortholinear keyboard
-
 /* key matrix size */
 #define MATRIX_ROWS 4
 #define MATRIX_COLS 12
diff --git a/keyboards/planck/keymaps/pvc/rules.mk b/keyboards/planck/keymaps/pvc/rules.mk
index c92ca1bff..8a73eab58 100644
--- a/keyboards/planck/keymaps/pvc/rules.mk
+++ b/keyboards/planck/keymaps/pvc/rules.mk
@@ -1,7 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in
 #   the appropriate keymap folder that will get included automatically
@@ -20,8 +16,4 @@ BLUETOOTH_ENABLE = no  # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE  = no  # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-SLEEP_LED_ENABLE = no  # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
+SLEEP_LED_ENABLE = no  # Breathing sleep LED during USB suspend
\ No newline at end of file
diff --git a/keyboards/planck/keymaps/sgoodwin/rules.mk b/keyboards/planck/keymaps/sgoodwin/rules.mk
index 9081c6d3e..279e16eb7 100644
--- a/keyboards/planck/keymaps/sgoodwin/rules.mk
+++ b/keyboards/planck/keymaps/sgoodwin/rules.mk
@@ -1,8 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in 
 #   the appropriate keymap folder that will get included automatically
@@ -22,8 +17,4 @@ RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.  Do not enable this
 API_SYSEX_ENABLE = no				# Disable extra stuff for ergodoxen
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
\ No newline at end of file
diff --git a/keyboards/planck/keymaps/tak3over/rules.mk b/keyboards/planck/keymaps/tak3over/rules.mk
index b2ca41944..247a1fd2a 100644
--- a/keyboards/planck/keymaps/tak3over/rules.mk
+++ b/keyboards/planck/keymaps/tak3over/rules.mk
@@ -1,8 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in 
 #   the appropriate keymap folder that will get included automatically
@@ -21,8 +16,4 @@ BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
\ No newline at end of file
diff --git a/keyboards/planck/keymaps/thermal_printer/rules.mk b/keyboards/planck/keymaps/thermal_printer/rules.mk
index 9477d1179..7c50d87a0 100644
--- a/keyboards/planck/keymaps/thermal_printer/rules.mk
+++ b/keyboards/planck/keymaps/thermal_printer/rules.mk
@@ -1,8 +1,3 @@
-# Please remove if no longer applicable
-$(warning THIS FILE MAY BE TOO LARGE FOR YOUR KEYBOARD)
-$(warning Please disable some options in the Makefile to resolve)
-
-
 # Build Options
 #   change to "no" to disable the options, or define them in the Makefile in 
 #   the appropriate keymap folder that will get included automatically
@@ -23,7 +18,3 @@ PRINTING_ENABLE = yes
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
 SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
diff --git a/keyboards/planck/planck.c b/keyboards/planck/planck.c
index caef2fe5f..3980b02f5 100644
--- a/keyboards/planck/planck.c
+++ b/keyboards/planck/planck.c
@@ -1,4 +1,4 @@
-#include QMK_KEYBOARD_H
+#include "planck.h"
 
 #ifdef ONEHAND_ENABLE
 __attribute__ ((weak))
diff --git a/keyboards/planck/planck.h b/keyboards/planck/planck.h
index c055d73cb..0ac4375d1 100644
--- a/keyboards/planck/planck.h
+++ b/keyboards/planck/planck.h
@@ -1,8 +1,6 @@
 #ifndef PLANCK_H
 #define PLANCK_H
 
-#include QMK_SUBPROJECT_H
-
 #include "quantum.h"
 
 #define PLANCK_MIT( \
@@ -34,4 +32,11 @@
 #define KEYMAP PLANCK_GRID
 #define LAYOUT_ortho_4x12 PLANCK_GRID
 
+#ifdef KEYBOARD_planck_rev3
+    #include "rev3.h"
+#endif
+#ifdef KEYBOARD_planck_rev4
+    #include "rev4.h"
+#endif
+
 #endif
diff --git a/keyboards/planck/readme.md b/keyboards/planck/readme.md
index b1a8c23b2..2d76a312a 100644
--- a/keyboards/planck/readme.md
+++ b/keyboards/planck/readme.md
@@ -11,6 +11,6 @@ Hardware Availability: [OLKB.com](https://olkb.com), [Massdrop](https://www.mass
 
 Make example for this keyboard (after setting up your build environment):
 
-    make planck-rev4-default
+    make planck/rev4:default
 
 See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
\ No newline at end of file
diff --git a/keyboards/planck/rev3/config.h b/keyboards/planck/rev3/config.h
index ade11ffe1..45e60962b 100644
--- a/keyboards/planck/rev3/config.h
+++ b/keyboards/planck/rev3/config.h
@@ -1,7 +1,7 @@
 #ifndef REV3_CONFIG_H
 #define REV3_CONFIG_H
 
-#include QMK_KEYBOARD_CONFIG_H
+#include "config_common.h"
 
 #define DEVICE_VER 0x0003
 
diff --git a/keyboards/planck/rev3/rev3.h b/keyboards/planck/rev3/rev3.h
index e5e05236c..50a09741d 100644
--- a/keyboards/planck/rev3/rev3.h
+++ b/keyboards/planck/rev3/rev3.h
@@ -1,6 +1,6 @@
 #ifndef REV3_H
 #define REV3_H
 
-#include QMK_KEYBOARD_H
+#include "planck.h"
 
 #endif
\ No newline at end of file
diff --git a/keyboards/planck/rev4/config.h b/keyboards/planck/rev4/config.h
index dcc76c11c..4ff7649fb 100644
--- a/keyboards/planck/rev4/config.h
+++ b/keyboards/planck/rev4/config.h
@@ -1,7 +1,7 @@
 #ifndef REV4_CONFIG_H
 #define REV4_CONFIG_H
 
-#include QMK_KEYBOARD_CONFIG_H
+#include "config_common.h"
 
 #define DEVICE_VER 0x0004
 
diff --git a/keyboards/planck/rev4/rev4.h b/keyboards/planck/rev4/rev4.h
index 2d35df19d..74ec05460 100644
--- a/keyboards/planck/rev4/rev4.h
+++ b/keyboards/planck/rev4/rev4.h
@@ -1,6 +1,6 @@
 #ifndef REV4_H
 #define REV4_H
 
-#include QMK_KEYBOARD_H
+#include "planck.h"
 
 #endif
\ No newline at end of file
diff --git a/keyboards/planck/rules.mk b/keyboards/planck/rules.mk
index c4091f011..bee5f8789 100644
--- a/keyboards/planck/rules.mk
+++ b/keyboards/planck/rules.mk
@@ -67,4 +67,6 @@ API_SYSEX_ENABLE = no
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
 SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
 
-LAYOUTS = ortho_4x12
\ No newline at end of file
+LAYOUTS = ortho_4x12
+
+DEFAULT_FOLDER = planck/rev4
\ No newline at end of file
diff --git a/keyboards/planck/subproject.mk b/keyboards/planck/subproject.mk
deleted file mode 100644
index ac79a3354..000000000
--- a/keyboards/planck/subproject.mk
+++ /dev/null
@@ -1 +0,0 @@
-SUBPROJECT_DEFAULT = rev4