imx233: add small framework for LED

It handles GPIO and PWM based LEDs, possibly with several channels (red-green
LED for example). The debug allows one to play with the setting.
Currently the code supports the ZEN, ZEN X-Fi, and ZEN Mozaic.

Change-Id: I8c3b66e6ba21778acdb123daabb724280a7d1a4f

1 files changed, 69 insertions, 0 deletions

diff --git a/firmware/target/arm/imx233/led-imx233.h b/firmware/target/arm/imx233/led-imx233.h
new file mode 100644
index 0000000000..658135c94a
--- /dev/null
+++ b/firmware/target/arm/imx233/led-imx233.h
@@ -0,0 +1,69 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (c) 2017 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.
+ *
+ ****************************************************************************/
+#ifndef __LED_IMX233_H__
+#define __LED_IMX233_H__
+
+#include "system.h"
+
+/** LED API
+ *
+ * The following assumes each single LED is controllable by one
+ * or more channels. Each channel is either controlled by a GPIO (on/off) or a
+ * PWM. Each channel also has a color, so it is possible to describe
+ * a red-green LED for example. */
+
+/* LED channel color */
+enum imx233_led_color_t
+{
+    LED_RED,
+    LED_GREEN,
+    LED_BLUE,
+};
+
+/* LED channel */
+struct imx233_led_chan_t
+{
+    bool has_pwm; /* GPIO or PWM */
+    enum imx233_led_color_t color; /* color */
+    int gpio_bank, gpio_pin; /* GPIO bank and pin (also valid for PWM) */
+    int pwm_chan; /* for PWM: harware channel*/
+};
+
+/* LED */
+struct imx233_led_t
+{
+    int nr_chan; /* number of channels */
+    struct imx233_led_chan_t *chan; /* array of channels */
+};
+
+/* init: all LEDs are turned off on init */
+void imx233_led_init(void);
+/* get number of LEDs */
+int imx233_led_get_count(void);
+/* return an array of LEDs */
+struct imx233_led_t *imx233_led_get_info(void);
+/* set LED channel on/off, it also works for PWM channel by setting the PWM to
+ * constantly off or constantly on */
+void imx233_led_set(int led, int chan, bool on);
+/* set LED PWM: control the frequency and the duty cycle percentage (0-100) */
+void imx233_led_set_pwm(int led, int chan, int freq, int duty);
+
+#endif /* __LED_IMX233_H__ */