Backlight - Carve out a better location for private driver functionality (#8329)

* rename backlight_soft to match rules.mk

* rename backlight_soft to match rules.mk - update common_features

* Carve out a better location for private driver backlight functionality

1 files changed, 49 insertions, 0 deletions

diff --git a/quantum/backlight/backlight_driver_common.c b/quantum/backlight/backlight_driver_common.c
new file mode 100644
index 000000000..270a43c67
--- /dev/null
+++ b/quantum/backlight/backlight_driver_common.c
@@ -0,0 +1,49 @@
+#include "quantum.h"
+#include "backlight.h"
+#include "backlight_driver_common.h"
+
+#if !defined(BACKLIGHT_PIN) && !defined(BACKLIGHT_PINS)
+#    error "Backlight pin/pins not defined. Please configure."
+#endif
+
+#if defined(BACKLIGHT_PINS)
+static const pin_t backlight_pins[] = BACKLIGHT_PINS;
+#    ifndef BACKLIGHT_LED_COUNT
+#        define BACKLIGHT_LED_COUNT (sizeof(backlight_pins) / sizeof(pin_t))
+#    endif
+
+#    define FOR_EACH_LED(x)                                 \
+        for (uint8_t i = 0; i < BACKLIGHT_LED_COUNT; i++) { \
+            pin_t backlight_pin = backlight_pins[i];        \
+            { x }                                           \
+        }
+#else
+// we support only one backlight pin
+static const pin_t backlight_pin = BACKLIGHT_PIN;
+#    define FOR_EACH_LED(x) x
+#endif
+
+static inline void backlight_on(pin_t backlight_pin) {
+#if BACKLIGHT_ON_STATE == 0
+    writePinLow(backlight_pin);
+#else
+    writePinHigh(backlight_pin);
+#endif
+}
+
+static inline void backlight_off(pin_t backlight_pin) {
+#if BACKLIGHT_ON_STATE == 0
+    writePinHigh(backlight_pin);
+#else
+    writePinLow(backlight_pin);
+#endif
+}
+
+void backlight_pins_init(void) {
+    // Setup backlight pin as output and output to off state.
+    FOR_EACH_LED(setPinOutput(backlight_pin); backlight_off(backlight_pin);)
+}
+
+void backlight_pins_on(void) { FOR_EACH_LED(backlight_on(backlight_pin);) }
+
+void backlight_pins_off(void) { FOR_EACH_LED(backlight_off(backlight_pin);) }