2 files changed, 36 insertions, 0 deletions
diff --git a/driver/charger/rt946x.c b/driver/charger/rt946x.c
index 3d5722ae09..d38690892a 100644
--- a/driver/charger/rt946x.c
+++ b/driver/charger/rt946x.c
@@ -1114,6 +1114,24 @@ int mt6370_db_set_voltages(int vbst, int vpos, int vneg)
 	return rv;
 }
 
+/* MT6370 BACKLIGHT LED */
+
+int mt6370_backlight_set_dim(uint16_t dim)
+{
+	int rv;
+
+	/* datasheet suggests that update BLDIM2 first then BLDIM */
+	rv = rt946x_write8(MT6370_BACKLIGHT_BLDIM2, dim & MT6370_MASK_BLDIM2);
+
+	if (rv)
+		return rv;
+
+	rv = rt946x_write8(MT6370_BACKLIGHT_BLDIM,
+			   (dim >> MT6370_SHIFT_BLDIM_MSB) & MT6370_MASK_BLDIM);
+
+	return rv;
+}
+
 /* MT6370 RGB LED */
 
 int mt6370_led_set_dim_mode(enum mt6370_led_index index,
diff --git a/driver/charger/rt946x.h b/driver/charger/rt946x.h
index ee35fae901..d9ec30a596 100644
--- a/driver/charger/rt946x.h
+++ b/driver/charger/rt946x.h
@@ -138,6 +138,7 @@
 /* backlight */
 #define MT6370_BACKLIGHT_BLEN		0xA0
 #define MT6370_BACKLIGHT_BLPWM		0xA2
+#define MT6370_BACKLIGHT_BLDIM2		0xA4
 #define MT6370_BACKLIGHT_BLDIM		0xA5
 
 /* Display bias */
@@ -558,6 +559,15 @@
 
 #define MT6370_MASK_BLPWM_BLED_PWM	BIT(MT6370_SHIFT_BLPWM_BLED_PWM)
 
+/* ========== BLDIM2 0xA4 (mt6370) ============ */
+#define MT6370_MASK_BLDIM2		0x7
+
+/* ========== BLDIM 0xA5 (mt6370) ============ */
+#define MT6370_SHIFT_BLDIM_MSB		3
+#define MT6370_MASK_BLDIM		0xff
+
+#define MT6370_BLDIM_DEFAULT		0x7ff
+
 /* ========== CHGSTAT2 0xD1 (mt6370) ============ */
 #ifdef CONFIG_CHARGER_MT6370
 #define MT6370_SHIFT_CHG_VBUSOV_STAT	7
@@ -668,6 +678,14 @@ enum mt6370_led_pwm_freq {
 int mt6370_db_external_control(int en);
 
 /**
+ * Set backlight LED dim.
+ *
+ * dim: A value from 0 to 2047.
+ * return: EC_SUCCESS on success, and EC_ERROR_* otherwise.
+ */
+int mt6370_backlight_set_dim(uint16_t dim);
+
+/**
  * MT6370 display bias voltage settings.
  *
  * Set disaply bias voltages for the panel.