Move Ergodox EZ RGB Light code to custom driver (#7309)

* Move Ergodox EZ RGB code to custom driver

Also implements full addressing of Ergodox EZ's LED Strip, as written by seebs
Co-authored-by: Seebs <seebs@seebs.net>

* Make Clipping range accessible for custom drivers

* Remove RGBW_BB_TWI from driver and docs

* Revert changes to clipping range support

* Use just rgblight_set instead of full custom driver

* Convert to i2c_master commands

* Rename rgblight driver and clean up includes

4 files changed, 118 insertions, 5 deletions

diff --git a/keyboards/ergodox_ez/config.h b/keyboards/ergodox_ez/config.h
index bb51ec3215..e60101e5e2 100644
--- a/keyboards/ergodox_ez/config.h
+++ b/keyboards/ergodox_ez/config.h
@@ -75,17 +75,21 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 /* ws2812 RGB LED */
 #define RGB_DI_PIN D7
 #define RGBLIGHT_ANIMATIONS
-#define RGBLED_NUM 15     // Number of LEDs
 #define RGBLIGHT_HUE_STEP 12
 #define RGBLIGHT_SAT_STEP 255
 #define RGBLIGHT_VAL_STEP 12
 
+// Pick one of the modes
+// Defaults to 15 mirror, for legacy behavior
+
+// #define ERGODOX_LED_15 // Addresses 15 LEDs, but same position on both halves
+// #define ERGODOX_LED_15_MIRROR // Addresses 15 LEDs, but are mirrored
+// #define ERGODOX_LED_30 // Addresses all 30 LED individually
+
 /* fix space cadet rollover issue */
 #define DISABLE_SPACE_CADET_ROLLOVER
 
-#define RGBW_BB_TWI
-
-#define RGBW 1
+#define RGBW
 
 #define RGBLIGHT_SLEEP
 
diff --git a/keyboards/ergodox_ez/led_i2c.c b/keyboards/ergodox_ez/led_i2c.c
new file mode 100644
index 0000000000..3e75a8cd08
--- /dev/null
+++ b/keyboards/ergodox_ez/led_i2c.c
@@ -0,0 +1,86 @@
+/*
+ * light weight WS2812 lib V2.0b
+ *
+ * Controls WS2811/WS2812/WS2812B RGB-LEDs
+ * Author: Tim (cpldcpu@gmail.com)
+ *
+ * Jan 18th, 2014  v2.0b Initial Version
+ * Nov 29th, 2015  v2.3  Added SK6812RGBW support
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+#ifdef RGBLIGHT_ENABLE
+
+#    include "ws2812.c"
+#    include "ergodox_ez.h"
+
+extern rgblight_config_t rgblight_config;
+
+/*
+ * Forward declare internal functions
+ *
+ * The functions take a byte-array and send to the data output as WS2812 bitstream.
+ * The length is the number of bytes to send - three per LED.
+ */
+
+void ws2812_sendarray(uint8_t *array, uint16_t length);
+void ws2812_sendarray_mask(uint8_t *array, uint16_t length, uint8_t pinmask);
+
+
+
+
+void rgblight_set(void) {
+    if (!rgblight_config.enable) {
+        for (uint8_t i = 0; i < RGBLED_NUM; i++) {
+            led[i].r = 0;
+            led[i].g = 0;
+            led[i].b = 0;
+#ifdef RGBW
+            led[i].w = 0;
+#endif
+        }
+    }
+
+
+    uint8_t led_num = RGBLED_NUM;
+    i2c_init();
+    i2c_start(0x84, ERGODOX_EZ_I2C_TIMEOUT);
+    int i = 0;
+#    if defined(ERGODOX_LED_30)
+    // prevent right-half code from trying to bitbang all 30
+    // so with 30 LEDs, we count from 29 to 15 here, and the
+    // other half does 0 to 14.
+    led_num = RGBLED_NUM / 2;
+    for (i = led_num + led_num - 1; i >= led_num; --i)
+#    elif defined(ERGODOX_LED_15_MIRROR)
+    for (i = 0; i < led_num; ++i)
+#    else  // ERGDOX_LED_15 non-mirrored
+    for (i = led_num - 1; i >= 0; --i)
+#    endif
+    {
+        uint8_t *data = (uint8_t *)(led + i);
+        i2c_write(*data++, ERGODOX_EZ_I2C_TIMEOUT);
+        i2c_write(*data++, ERGODOX_EZ_I2C_TIMEOUT);
+        i2c_write(*data++, ERGODOX_EZ_I2C_TIMEOUT);
+#ifdef RGBW
+        i2c_write(*data++, ERGODOX_EZ_I2C_TIMEOUT);
+#endif
+    }
+    i2c_stop();
+
+    ws2812_setleds(led, RGBLED_NUM);
+}
+
+
+#endif  // RGBLIGHT_ENABLE
diff --git a/keyboards/ergodox_ez/post_config.h b/keyboards/ergodox_ez/post_config.h
new file mode 100644
index 0000000000..526cc8c417
--- /dev/null
+++ b/keyboards/ergodox_ez/post_config.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#if !defined(ERGODOX_LED_15) && !defined(ERGODOX_LED_30)
+// if no value is defined, assume previous behavior
+// #    define ERGODOX_LED_15
+// #    define ERGODOX_LED_30
+#    define ERGODOX_LED_15_MIRROR
+#endif
+
+#if (defined(ERGODOX_LED_30) + defined(ERGODOX_LED_15) + defined(ERGODOX_LED_15_MIRROR)) != 1
+#    error "You must only define one of the ERGODOX_LED options."
+#endif
+
+#ifdef ERGODOX_LED_30
+// If using 30 LEDs, then define that many
+#    define RGBLED_NUM 30  // Number of LEDs
+#else
+// If not, then only define 15
+#    define RGBLED_NUM 15  // Number of LEDs
+#endif
diff --git a/keyboards/ergodox_ez/rules.mk b/keyboards/ergodox_ez/rules.mk
index dbc35f6836..fd8f5722d3 100644
--- a/keyboards/ergodox_ez/rules.mk
+++ b/keyboards/ergodox_ez/rules.mk
@@ -31,11 +31,14 @@ SWAP_HANDS_ENABLE= yes # Allow swapping hands of keyboard
 SLEEP_LED_ENABLE = no
 API_SYSEX_ENABLE = no
 RGBLIGHT_ENABLE = yes
+RGBLIGHT_CUSTOM_DRIVER = yes
+
 RGB_MATRIX_ENABLE = no # enable later
 DEBOUNCE_TYPE = eager_pr
 
 # project specific files
-SRC += matrix.c
+SRC += matrix.c \
+	   led_i2c.c
 QUANTUM_LIB_SRC += i2c_master.c
 
 LAYOUTS = ergodox