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imx233: add small framework for LED

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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
This commit is contained in:
Amaury Pouly 2017-01-11 16:58:30 +01:00 • committed by Gerrit Rockbox
parent 759a78e5df
commit b23b7088cb
6 changed files with 312 additions and 5 deletions
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69
firmware/target/arm/imx233/led-imx233.h Normal file
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/***************************************************************************
* __________ __ ___.
* 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__ */