1 files changed, 88 insertions, 0 deletions

diff --git a/firmware/target/mips/ingenic_x1000/fiiom3k/backlight-fiiom3k.c b/firmware/target/mips/ingenic_x1000/fiiom3k/backlight-fiiom3k.c
new file mode 100644
index 0000000000..f02fcaaee8
--- /dev/null
+++ b/firmware/target/mips/ingenic_x1000/fiiom3k/backlight-fiiom3k.c
@@ -0,0 +1,88 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2021 Aidan MacDonald
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "backlight.h"
+#include "backlight-target.h"
+#include "lcd.h"
+#include "pwm-x1000.h"
+
+#define BL_LCD_CHN    0
+#define BL_LCD_PERIOD 33000
+
+#define BL_BTN_CHN    4
+#define BL_BTN_PERIOD 100000
+
+static int backlight_calc_duty(int period, int min_duty, int brightness)
+{
+    return min_duty + (period - min_duty) * brightness / MAX_BRIGHTNESS_SETTING;
+}
+
+bool backlight_hw_init(void)
+{
+    pwm_init(BL_LCD_CHN);
+    pwm_init(BL_BTN_CHN);
+    pwm_enable(BL_LCD_CHN);
+    pwm_enable(BL_BTN_CHN);
+    backlight_hw_brightness(MAX_BRIGHTNESS_SETTING);
+    buttonlight_hw_brightness(MAX_BRIGHTNESS_SETTING);
+    /* TODO: avoid buttonlight flicker when powering up the machine */
+    return true;
+}
+
+void backlight_hw_on(void)
+{
+    pwm_enable(BL_LCD_CHN);
+#ifdef HAVE_LCD_ENABLE
+    lcd_enable(true);
+#endif
+}
+
+void backlight_hw_off(void)
+{
+    pwm_disable(BL_LCD_CHN);
+#ifdef HAVE_LCD_ENABLE
+    lcd_enable(false);
+#endif
+}
+
+void backlight_hw_brightness(int brightness)
+{
+    int duty_ns = backlight_calc_duty(BL_LCD_PERIOD, 0, brightness);
+    pwm_set_period(BL_LCD_CHN, BL_LCD_PERIOD, duty_ns);
+}
+
+void buttonlight_hw_on(void)
+{
+    pwm_enable(BL_BTN_CHN);
+}
+
+void buttonlight_hw_off(void)
+{
+    pwm_disable(BL_BTN_CHN);
+}
+
+void buttonlight_hw_brightness(int brightness)
+{
+    /* Duty cycle below 11% seems to turn the buttonlight off entirely,
+     * so we need to rescale the range */
+    int duty_ns = backlight_calc_duty(BL_BTN_PERIOD, BL_BTN_PERIOD*11/100, brightness);
+    pwm_set_period(BL_BTN_CHN, BL_BTN_PERIOD, duty_ns);
+}