summaryrefslogtreecommitdiffstats
path: root/firmware/target/arm/imx233/creative-zenxfi3/backlight-zenxfi3.c
diff options
context:
space:
mode:
Diffstat (limited to 'firmware/target/arm/imx233/creative-zenxfi3/backlight-zenxfi3.c')
-rw-r--r--firmware/target/arm/imx233/creative-zenxfi3/backlight-zenxfi3.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/firmware/target/arm/imx233/creative-zenxfi3/backlight-zenxfi3.c b/firmware/target/arm/imx233/creative-zenxfi3/backlight-zenxfi3.c
new file mode 100644
index 0000000000..59c3c133aa
--- /dev/null
+++ b/firmware/target/arm/imx233/creative-zenxfi3/backlight-zenxfi3.c
@@ -0,0 +1,85 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2012 by Amaury Pouly
+ *
+ * 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 "config.h"
+#include "system.h"
+#include "lcd.h"
+#include "backlight.h"
+#include "backlight-target.h"
+#include "pwm-imx233.h"
+#include "mpr121.h"
+
+void _backlight_set_brightness(int brightness)
+{
+ imx233_pwm_setup_channel(2, 1024, HW_PWM_PERIODx__CDIV__DIV_1,
+ 0, HW_PWM_PERIODx__STATE__HIGH,
+ (brightness * 1024) / 100, HW_PWM_PERIODx__STATE__LOW);
+ imx233_pwm_enable_channel(2, true);
+}
+
+bool _backlight_init(void)
+{
+ _backlight_set_brightness(DEFAULT_BRIGHTNESS_SETTING);
+ return true;
+}
+
+void _backlight_on(void)
+{
+#ifdef HAVE_LCD_ENABLE
+ lcd_enable(true); /* power on lcd + visible display */
+#endif
+ /* don't do anything special, the core will set the brightness */
+}
+
+void _backlight_off(void)
+{
+ /* there is no real on/off but we can set to 0 brightness */
+ _backlight_set_brightness(0);
+#ifdef HAVE_LCD_ENABLE
+ lcd_enable(false); /* power off visible display */
+#endif
+}
+
+/* ELE8 is the button light GPIO */
+void _buttonlight_on(void)
+{
+ /* assume mpr121 was initialized by button-zenxfi3.c */
+ mpr121_set_gpio_output(8, ELE_GPIO_SET);
+}
+
+void _buttonlight_off(void)
+{
+ /* assume mpr121 was initialized by button-zenxfi3.c */
+ mpr121_set_gpio_output(8, ELE_GPIO_CLR);
+}
+
+void _buttonlight_set_brightness(int brightness)
+{
+ /* assume mpr121 was initialized by button-zenxfi3.c */
+ /* since backlight brightness is the same for the screen and the button light,
+ * map [MIN_BRIGHTNESS_SETTING,MAX_BRIGHTNESS_SETTING] to
+ * [ELE_PWM_MIN_DUTY,ELE_PWM_MAX_DUTY] */
+ brightness = ELE_PWM_MIN_DUTY + (brightness - MIN_BRIGHTNESS_SETTING) *
+ (ELE_PWM_MAX_DUTY - ELE_PWM_MIN_DUTY + 1) /
+ (MAX_BRIGHTNESS_SETTING - MIN_BRIGHTNESS_SETTING + 1);
+ brightness = MIN(brightness, ELE_PWM_MAX_DUTY);
+ mpr121_set_gpio_pwm(8, brightness);
+}