Initial migration of software PWM backlight (#6709)

* Initial migration of software PWM backlight

* First pass at backlight driver docs

* Correct driver name in docs

* Run backlight_task when using BACKLIGHT_PINS

* Resolve backlight docs TODOs

1 files changed, 12 insertions, 9 deletions

diff --git a/common_features.mk b/common_features.mk
index 7bb9187bb..a1f95955a 100644
--- a/common_features.mk
+++ b/common_features.mk
@@ -234,7 +234,7 @@ ifeq ($(strip $(BACKLIGHT_CUSTOM_DRIVER)), yes)
     BACKLIGHT_ENABLE = custom
 endif
 
-VALID_BACKLIGHT_TYPES := yes custom
+VALID_BACKLIGHT_TYPES := yes software custom
 
 BACKLIGHT_ENABLE ?= no
 ifneq ($(strip $(BACKLIGHT_ENABLE)), no)
@@ -246,19 +246,22 @@ ifneq ($(strip $(BACKLIGHT_ENABLE)), no)
         CIE1931_CURVE = yes
     endif
 
-
     COMMON_VPATH += $(QUANTUM_DIR)/backlight
     SRC += $(QUANTUM_DIR)/backlight/backlight.c
     OPT_DEFS += -DBACKLIGHT_ENABLE
 
-    ifeq ($(strip $(BACKLIGHT_ENABLE)), custom)
-        OPT_DEFS += -DBACKLIGHT_CUSTOM_DRIVER
-    endif
-
-    ifeq ($(PLATFORM),AVR)
-        SRC += $(QUANTUM_DIR)/backlight/backlight_avr.c
+    ifeq ($(strip $(BACKLIGHT_ENABLE)), software)
+        SRC += $(QUANTUM_DIR)/backlight/backlight_soft.c
     else
-        SRC += $(QUANTUM_DIR)/backlight/backlight_arm.c
+        ifeq ($(strip $(BACKLIGHT_ENABLE)), custom)
+            OPT_DEFS += -DBACKLIGHT_CUSTOM_DRIVER
+        endif
+
+        ifeq ($(PLATFORM),AVR)
+            SRC += $(QUANTUM_DIR)/backlight/backlight_avr.c
+        else
+            SRC += $(QUANTUM_DIR)/backlight/backlight_arm.c
+        endif
     endif
 endif